Field
Some embodiments of this disclosure relate to passively vented headworn supports, and more specifically to headworn supports, such as eyewear, having a frame and a lens configured to allow for efficient ventilation of the lens; and some embodiments relate to headworn supports, such as eyewear, with one or more removable lenses, and more specifically to headworn supports, such as eyewear, with a removable lens that can be installed in headworn supports having different structures and/or functions including, but not limited to, eyeglasses and goggles.
Description of Related Art
A wide variety of eyewear products are available with various drawbacks, such as insufficient ventilation (which can lead to wearer discomfort and visual impairment), insufficient protection (e.g., at lateral portions of the eyewear), and insufficient ballistic impact resistance, among other deficiencies.
Example embodiments described herein have several features, no single one of which is indispensable or solely responsible for their desirable attributes. Without limiting the scope of the claims, some of the advantageous features will now be summarized. While the features and structures are described below in connection with embodiments of eyewear such as eyeglasses and goggles, it is to be understood that the features and structures can be implemented in any headworn support (i.e., a headworn article that can support one or more lenses in the wearer's field of view). For example, other headworn supports can include, but are not limited to, helmets, face masks, balaclavas, and breaching shields.
In a first aspect, an eyewear is provided that includes a lens having a posterior surface adjacent a face of a user when worn and an anterior surface opposite the posterior surface. The eyewear includes a frame comprising a plurality of contact points configured to contact the lens. The eyewear includes at least one earstem attached to the frame. The eyewear includes a retention assembly attached to the frame and the at least one earstem, the retention assembly configured to secure the lens to the frame so that the lens contacts the frame at the plurality of contact points. When the lens is secured in the eyewear, an upper edge of the lens and a lower edge of the frame are spaced apart between contact points to allow venting of the lens and a total length of the upper edge that is spaced apart from the frame is at least 20% of the total chord length of the upper edge of the lens. A posterior surface of the lens between contact points extends a protrusion distance beyond a posterior extension of the posterior surface of the lens, wherein the protrusion distance is less than or equal to about 4 mm.
In some embodiments of the first aspect, one or more of the contact points comprises an attachment point configured to structurally support the lens when the lens is secured in the eyewear. In some embodiments of the first aspect, the total, continuous length of the upper edge that is spaced apart from the frame is at least 50% of the total chord length of the upper edge of the lens. In a further embodiment, the total length of the upper edge that is spaced apart from the frame is less than or equal to 80% of the total chord length of the upper edge of the lens.
In some embodiments of the first aspect, the protrusion distance is less than or equal to 0. In some embodiments of the first aspect, the protrusion distance is less than or equal to 3.2 times a center thickness of the lens. In some embodiments of the first aspect, when worn, there is no direct path from an eye of the user between the upper edge of the lens and the lower edge of the frame. In some embodiments of the first aspect, the posterior extension does not intersect the frame over at least half of the total length of the upper edge of the lens. In some embodiments of the first aspect, when worn, a viewing angle from an eye of a user to an edge of the frame is greater than or equal to about 48 degrees. In some embodiments of the first aspect, a venting angle is greater than 0 degrees above the horizon.
In some embodiments of the first aspect, the eyewear is configured to withstand a ballistic impact of a 0.25″ ball having a speed of at least about 150 ft/s. In some embodiments of the first aspect, the eyewear is configured to withstand a ballistic impact of a 0.15 caliber cylindrical-shaped, chamfered-edge fragment having a speed of at least about 640 ft/s. In some embodiments of the first aspect, a lower edge of the lens does not contact the frame.
In some embodiments of the first aspect, the lens is configured to be secured in a goggle in addition to the eyewear, the goggle including a lens support adapted to support the lens in a wearer's field of view, the lens support having a channel configured to receive the lens and secure the lens in place; and a padded layer attached to an anterior surface of the lens support, the padded layer configured to be pressed against a head of the wearer when in use.
In a second aspect, an eyewear is provided that includes a lens, a frame comprising one or more contact points configured to contact the lens, the frame configured to position the lens in a line of sight of a wearer, and an earstem hingedly attached to the frame. The eyewear also includes a retention assembly attached to the frame and the earstem, the retention assembly configured to secure the lens to the frame so that the lens contacts the frame at the plurality of contact points. When the lens is secured in the eyewear, an upper edge of the lens and a lower edge of the frame are spaced apart between contact points to allow venting of the lens. A venting angle formed by an anterior surface of the frame and the upper edge of the lens is greater than or equal to 0 so that gaps between the upper edge of the lens and the lower edge of the frame between contact points are not visible when the eyewear is viewed straight on.
In some embodiments of the second aspect, the retention assembly comprises a door configured to be actuatable independent of the at least one earstem when the at least one earstem is folded behind the frame. In a further embodiment, the retention assembly further comprises a protrusion configured to be inserted through a locking receptacle in the retention assembly when the retention assembly secures the lens to the frame. In a further embodiment, the door of the retention assembly is configured to transition from open to closed to secure the lens to the frame when the earstem transitions from a folded position behind the frame to an extended position.
In some embodiments of the second aspect, the eyewear further includes at least two attachment points configured to attach to opposite, lateral edges of the lens. In some embodiments of the second aspect, the eyewear further includes an attachment point at a midpoint of the frame. In some embodiments of the second aspect, the eyewear further includes an attachment point comprising an opening formed between two side walls formed by the frame.
In a third aspect, an eyewear kit is provided that includes a lens. The kit also includes an eyeglass frame that has an eyeglass lens support adapted to receive the lens and an earstem attached to the eyeglass lens support. The kit also includes a goggle frame that has a lens support adapted to support the lens in a wearer's field of view, the lens support having a channel configured to receive the lens and secure the lens in place; and a padded layer attached to a posterior surface of the lens support, the padded layer configured to be pressed against a head of the wearer when in use. The lens is interchangeable between the eyeglass frame and the goggle frame such that the lens is configured to be alternatively supported by the eyeglass frame and the goggle frame.
In some embodiments of the third aspect, the eyeglass frame further comprises one or more contact points configured to contact the unitary lens when the unitary lens is secured to the eyeglass frame. In some embodiments of the third aspect, between two or more contact points, a posterior surface of the eyeglass frame extends a protrusion distance rearward beyond a posterior extension of a posterior surface of the lens, the protrusion distance being less than or equal to about 4 mm. In a further embodiment, when the lens is secured to the eyeglass frame, the upper edge of the lens and a lower edge of the eyeglass lens support are spaced apart between two or more contact points to allow venting of the lens. In a further embodiment, a total length of the upper edge that is spaced apart from the frame is at least 20% of a total chord length of the upper edge of the lens.
In some embodiments of the third aspect, when the lens is secured to the eyeglass frame, a venting angle formed by an anterior surface of the frame and an upper edge of the lens is greater than or equal to 0 so that gaps between the upper edge of the lens and the lower edge of the frame between contact points are not visible when the eyewear is viewed straight on.
In some embodiments of the third aspect, an eyewear comprising the lens secured to the eyeglass frame or the lens secured to the goggle frame is configured to withstand a ballistic impact of a 0.25″ ball having a speed of at least about 150 ft/s. In some embodiments of the third aspect, an eyewear comprising the lens secured to the eyeglass frame or the lens secured to the goggle frame is configured to withstand a ballistic impact of a 0.15 caliber cylindrical-shaped, chamfered-edge fragment having a speed of at least about 640 ft/s.
In some embodiments of the third aspect, between two or more contact points, a posterior surface of the eyeglass frame extends a protrusion distance rearward beyond a posterior extension of a posterior surface of the lens, the protrusion distance being less than or equal to about 3.2 times a center thickness of the lens. In a further embodiment, between two or more contact points, a posterior surface of the eyeglass frame extends a protrusion distance rearward beyond a posterior extension of a posterior surface of the lens, the protrusion distance being less than or equal to the center thickness of the lens. In some embodiments of the third aspect, the lens comprises a unitary lens.
Throughout the drawings, reference numbers may be re-used to indicate correspondence between referenced elements. The drawings are provided to illustrate example embodiments described herein and are not intended to limit the scope of the disclosure.
While the present description sets forth specific details of various embodiments, it will be appreciated that the description is illustrative only and should not be construed in any way as limiting. Additionally, although particular embodiments may be disclosed or shown in the context of particular types of eyewear systems, such as unitary lens eyeglasses, dual lens eyeglasses having partial or full orbitals, and goggles, it is understood that any elements of the disclosure may be used in any type of eyewear system. Moreover, any elements of the disclosure may be used in any headworn support (i.e., a headworn article that can support one or more lenses in the wearer's field of view). For example, other types of headworn supports can include, but are not limited to, helmets, face masks, balaclavas, and breaching shields. Further, although embodiments disclosed herein can be used with eyewear that have removable and replaceable lenses, embodiments are also contemplated in which the eyewear are not intended to provide for removable or replaceable lenses. Although some embodiments are illustrated with lenses having “cylindrical” or “spherical” front and rear surfaces (surfaces which conform substantially to a portion of the surface of a sphere or cylinder, respectively), it will be understood by those having ordinary skill in the art that, in some embodiments, lenses having different surface geometries can be used. Additionally, it will be understood that lenses of many front elevational shapes and orientations in the as-worn position can be used, beyond those illustrated herein. In particular, either the front or rear surface of a lens may conform to the surface of a toroidal or other aspheric geometry. Any feature, structure, function, material, method, or step disclosed and/or illustrated in this specification can be used by itself or with or instead of any other feature, structure, function, material, method, or step disclosed and/or illustrated elsewhere in this specification. Each portion of this specification is contemplated to be interchangeable and no portion is indispensable or essential.
Generally, headworn supports with lenses, including eyewear such as eyeglasses and goggles, are configured to provide desired optical functionality for a wearer. These headworn supports (such as eyewear) may also be used to intercept light, wind, dust, etc. from directly in front of the wearer and peripherally along the sides. In use, however, the lens or lenses can become clouded through condensation on the inner surface of the lens (e.g., the surface nearest the face of the user), reducing the wearer's visibility and/or degrading the optical performance of the lens. To reduce condensation on the lens, the headworn support can be configured to be vented using active or passive means. Venting can increase air flow at the inner surface or region of the lens and between the lens and the user, thereby reducing condensation. In passive venting systems, holes or other passageways may be introduced into the structures of the headworn support, such as frames, and/or lenses to provide a path for air to travel from one side of the headworn support (e.g., an exterior region) to the other (e.g., an interior region) to increase air flow. However, this may have the undesirable effect of allowing light to pass through such passageways into the eye of the user and/or allowing particles, dust, or debris through the holes to contact the user around the eye.
Some examples of headworn supports, such as eyewear, disclosed herein are configured to provide passive venting by providing one or more pathways between a lens and a frame and/or by providing a smooth rear profile to allow a laminar flow of air on a posterior surface of the lens. In certain implementations, the one or more passive-venting pathways provide a tortuous path between a frame and a lens of the headworn support to the eye of a wearer (e.g., they do not provide a direct path to the eye of the wearer from an exterior region). Thus, the headworn support provided herein can provide venting while reducing or preventing unwanted light, wind, particles, or other debris from contacting the eye of the user.
In some embodiments, a headworn support, such as an eyewear, is provided that includes a frame and a lens wherein a large proportion of the lens is unsupported by the frame such that a gap between the lens and the frame allows air to flow to provide passive venting. The gap is configured so that there is a tortuous path between the frame and the lens (e.g., there is no direct path between the frame and the lens to the eye of the user). In addition, when viewed from the front of the headworn support, the gap may not be visible to an observer. In addition, the headworn support can be configured to position the lens near the face of the user so that there is no direct path for light to travel to the eye of the user from the top of the headworn support. For example, light traveling downward passes through the lens to reach the eye of a user and does not reach the eye of the user without first passing through the lens. In some embodiments, the frame of the headworn support can be configured so that a portion of a posterior surface of the frame does not extend rearward from a posterior extension of the posterior lens surface. In certain embodiments, the frame of the headworn support can be configured so that a portion of the posterior surface of the frame extends rearward of from the posterior extension of the posterior lens surface, where the extension is less than or equal to about 4 mm, less than or equal to about 3.8 mm, less than or equal to about 3.5 mm, less than or equal to about 3.3 mm, less than or equal to about 3 mm, less than or equal to about 2.6 mm, less than or equal to about 2.25 mm, or less than or equal to about 2 mm. In certain embodiments, the extension can be less than or equal to about 3.2× a center thickness of the lens, less than or equal to about 3× the center thickness of the lens, less than or equal to about 2.5× the center thickness of the lens, less than or equal to about 2× the center thickness of the lens, less than or equal to about 1.5× the center thickness of the lens, less than or equal to about 1× the center thickness of the lens, or less than or equal to about 0.67× the center thickness of the lens. The portion of the frame that either does not extend past the posterior extension or that extends less than the stated distance past the posterior extension can have a total length that is at least 25% of the total chord length of the lens, at least 40% of the total chord length of the lens, at least 50% of the total chord length of the lens, at least 25% and/or less than or equal to about 80% of the total chord length of the lens, at least 35% and/or less than or equal to about 70% of the total chord length of the lens, or at least 45% and/or less than or equal to about 60% of the total chord length of the lens. In some embodiments, this structure and/or other structures can produce laminar flow of air between the lens and the face of the user that can increase ventilation as compared to headworn supports having a frame that extends past the lens in the posterior direction towards the face of the user, thereby introducing turbulence into the flow of air. This feature may be particularly advantageous for headworn supports, such as eyewear and face masks, that generally conform to the shape of the face of the wearer because with such headworn supports there is typically less space between the face of the wearer and the lens. Where there is less space, airflow may be reduced, resulting in reduced venting of the lens and potentially increasing condensation on the lens compared to lenses that are generally positioned away from the face from a wearer.
In some embodiments, a headworn support, such as an eyewear, is provided that has an interchangeable lens configured to be used with eyeglasses and/or with goggles. For example, the frame of the eyeglasses can be semi-rimless and the lens can be secured to the frame using active and passive retention systems. The eyeglasses can include earstems to secure the eyeglasses in place on the head of the wearer so that the front frame does not contact the face of the wearer. This same lens can be removed from the frame of the eyeglasses and secured in a goggle frame. In some embodiments, the goggle can have full orbitals and can be configured to contact a face of the user, using a head strap to secure it in place.
Example Eyeglass
With reference to
The lens 108 or lenses 108a, 108b 102b can be plano lenses (e.g., not curved). The lens 108 or lenses 108a, 108b 102b can be linear (not curved) along a vertical plane (e.g., cylindrical or frusto-conical lens geometry). In some embodiments, the lens 108 or lenses 108a, 108b can be aligned substantially parallel with the vertical axis such that the line of sight is substantially normal to the anterior surface and the posterior surface of the lens. In some embodiments, the lens 108 or lenses 108a, 108b are angled downward such that a line normal to the lens is offset from the straight ahead normal line of sight by an angle ϕ. The angle ϕ of offset can be greater than about 0° and/or less than about 30°, or greater than about 10° and/or less than about 20°, or about 15°, although other angles ϕ outside of these ranges may also be used. Various cylindrically shaped lenses may be used. The anterior surface and/or the posterior surface of the lens 108 or lenses 108a, 108b can conform to the surface of a right circular cylinder such that the radius of curvature along the horizontal axis is substantially uniform. An elliptical cylinder can be used to provide lenses that have non-uniform curvature in the horizontal direction. For example, a lens may be more curved near its lateral edge than its medial edge. In some embodiments, an oblique (non-right) cylinder can be used, for example, to provide a lens that is angled in the vertical direction.
In some embodiments, the eyeglass 100 incorporates a canted lens 108 or canted lenses 108a, 108b mounted in a position rotated laterally relative to conventional centrally oriented dual lens mountings. A canted lens may be conceived as having an orientation, relative to the wearer's head, which would be achieved by starting with conventional dual lens eyeglass having centrally oriented lenses and bending the frame inwardly at the temples to wrap around the side of the head. When the eyeglass 100 is worn, a lateral edge of the lens wraps significantly around and comes in close proximity to the wearer's temple to provide significant lateral eye coverage.
A degree of wrap may be desirable for aesthetic styling reasons, for lateral protection of the eyes from flying debris, or for interception of peripheral light. Wrap may be attained by utilizing lenses of tight horizontal curvature (high base), such as cylindrical or spherical lenses, and/or by mounting each lens in a position which is canted laterally and rearwardly relative to centrally oriented dual lenses. Similarly, a high degree of rake or vertical tilting may be desirable for aesthetic reasons and for intercepting light, wind, dust or other debris from below the wearer's eyes. In general, “rake” will be understood to describe the condition of a lens, in the as-worn orientation, for which the normal line of sight strikes a vertical tangent to the lens 108 at a non-perpendicular angle.
The lens 108 or lenses 108a, 108b can be provided with anterior and posterior surfaces and a thickness therebetween, which can be variable along the horizontal direction, vertical direction, or combination of directions. In some embodiments, the lens 108 or lenses 108a, 108b can have a varying thickness along the horizontal or vertical axis, or along some other direction. In some embodiments, the thickness of the lens 108 or lenses 108a, 108b tapers smoothly, though not necessarily linearly, from a maximum thickness proximate a medial edge to a relatively lesser thickness at a lateral edge. The lens 108 or lenses 108a, 108b can have a tapering thickness along the horizontal axis and can be decentered for optical correction. In some embodiments, the lens 108 or lenses 108a, 108b can have a thickness configured to provide an optical correction. For example, the thickness of the lens 108 or lenses 108a, 108b can taper from a thickest point at a central point of the lens 108 or lenses 108a, 108b approaching lateral segments of the lens 108 or lenses 108a, 108b. In some embodiments, the average thickness of the lens 108 or lenses 108a, 108b in the lateral segments can be less than the average thickness of the lens 108 or lenses 108a, 108b in the central zone. In some embodiments, the thickness of the lens 108 or lenses 108a, 108b in at least one point in the central zone can be greater than the thickness of the lens 108 or lenses 108a, 108b at any point within at least one of the lateral segments.
Various materials can be utilized in the manufacture of the frame 104, such as metals, composites, or relatively rigid, molded thermoplastic materials which are well known in the art, and which can be transparent or available in a variety of colors. In some embodiments, the frame 104 can be plastic and may comprise acetate, polycarbonate, or nylon. The frame can be configured to be relatively light, resilient, and resistant to ballistic impact.
The retention components 106 can be configured to removably secure the lens 108 to the frame 104, thereby allowing the wearer to interchange the lens 108 of the eyeglass 100. For example, the lens 108 can be interchanged for a different lens if the lens 108 becomes damaged or dirty, and the lens 108 can be interchanged for a different lens having different optical properties depending on the conditions of use. The retention components 106 can be configured to retain the lens 108 on the frame 104 in the event of impact to the lens 108 (e.g., a ballistic impact).
The retention components 106 can comprise one or more stationary or passive retention mechanisms and/or one or more movable or active retention mechanisms for engaging the lens 108. In a stationary or passive retention mechanism, engagement can occur between interlocking structures of the frame 104 and the lens 108 upon the lens 104 being fitted against a portion of the frame 104. For example, a protrusion along an edge of the lens 108 can fit into a groove of the frame 104 without requiring other or movable components to limit one or more degrees of freedom of movement of the lens 108 relative to the frame 104. In a movable or active retention mechanism, engagement can occur after the lens 108 is fitted against the frame 104 by moving a locking structure from a disengaged position to an engaged position. In a movable or active retention mechanism, a separate component can be moved relative to the lens 108 and the frame 104 to secure the lens 108 relative to the frame 104.
The passive and/or active retention mechanism(s) 106 can be disposed along any portion of the boundary between the lens 104 and the frame 108. In the illustrated embodiment, the unitary lens 108 has a passive lateral connector, a passive medial connector, and an active lateral connector, as detailed further below. In some embodiments, as illustrated, between the passive and active retention mechanisms 106, the lens 108 and the frame 104 can be configured to not contact one another. The space between the lens 108 and the frame 104 can provide for passive venting of the lens 108. Similarly, between the passive and active retention mechanisms 106, a posterior extension of the posterior surface of the frame can be configured so that it either does not extend rearward of an extension of the posterior surface of the lens 108 or it can be configured so that it extends rearward of this posterior extension less than or equal to about 4 mm, less than or equal to about 3.8 mm, less than or equal to about 3.5 mm, less than or equal to about 3.3 mm, less than or equal to about 3 mm, less than or equal to about 2.6 mm, less than or equal to about 2.25 mm, or less than or equal to about 2 mm. In certain embodiments, the extension can be less than or equal to about 3.2× a center thickness of the lens 108, less than or equal to about 3× the center thickness of the lens 108, less than or equal to about 2.5× the center thickness of the lens 108, less than or equal to about 2× the center thickness of the lens 108, less than or equal to about 1.5× the center thickness of the lens 108, less than or equal to about 1× the center thickness of the lens 108, or less than or equal to about 0.67× the center thickness of the lens 108. In some embodiments, the configuration of the posterior surface of the lens 108 and the posterior location and/or shape of the frame 104 can cooperate to facilitate a laminar flow of air across the posterior surface of the lens 108 to assist in venting the lens 108.
With reference to
In either dual or unitary lens embodiments of the eyeglass or goggle, the lens can comprise one or more surfaces, edges, or structures that can be engaged by the lens retention mechanisms 106 of the frame 104. The lens retention mechanism(s) 106 can comprise one or more active and/or passive engagement mechanisms such as those described herein. A stationary or passive lens retention mechanism can be formed between a complementary retention surface carried by the frame 104 and a retention surface of the lens 108, such as the edge of a slot, notch, projection or aperture facing generally away from the frame 104 to provide an interference fit.
In certain embodiments, the lens 108 can be engaged and/or supported at least at both lateral sides and a central portion thereof. For example, a unitary lens 108 may be secured to and/or supported by the frame 104 using a first retention structure on the left side of midline and a second retention structure on the right side of midline. The retention structures 106 can include any of the clips or other mechanisms disclosed herein. A retention structure 106 may be located within the frame 104 (e.g., within the central one-third of the frame, such as on or near the vertical midline or medial plane of the eyeglass). A plurality of retention structures 106 (e.g., at least two, three, four, five, six, or seven or more) may be used, depending at least in part upon the targeted performance. In various implementations, the retention structures 106 can be symmetrically spaced apart along the length of the frame 104, or as a mirror image across the plane of symmetry (anatomical midline or medial plane).
The eyeglass 100 can be useful in various settings, including military settings in which the wearer may experience conditions that may cause condensation on the lens, where eyeglass 100 may be subject to dust or other debris, and/or where the eyeglass 100 may experience a ballistic impact. The ventilation provided by the eyeglass 100 can reduce or prevent fogging on the interior of the eyeglass 100. In some embodiments, an anti-fogging coating can be applied to the interior of the eyeglass 100 (e.g., to the lens 108) to reduce or prevent moisture fogging. Various types of anti-fogging coatings can be used (e.g., moisture absorption coatings, moisture sheer coatings, coatings based on urethanes, and/or coatings based on treated polysiloxanes).
The retention mechanism 106c can be an active retention mechanism. The retention mechanism 106c can include a rotating door 202 and a protrusion 204, the protrusion being configured to pass through a locking receptacle 206 on the frame 104. The protrusion 204 can engage with the locking receptacle 206 on a lateral side of the frame 104. The protrusion 204 can comprise a protruding element attached to the door 202 which is rotatably movable between a first position in which the lens 108 may be freely positioned within or removed from the retention mechanism 106c, and a second position in which the lens 108 is locked within the retention mechanism 106c.
The retention mechanisms 106a, 106b can generally be passive mechanisms that receive projections 208a, 208b of the lens 108 such that the projections 208a, 208b are seated in the corresponding recesses formed by opposing walls of the retention mechanisms 106a, 106b. In use, the lens 108 can be slid into place by pressing the projections 208a, 208b into the corresponding recesses or openings of the retention mechanisms 106a, 106b. In this way, the lens 108 can be generally fitted into and retained within the retention mechanisms 106a, 106b in the frame 104 without also contacting other portions of the frame 104. Thus, in some embodiments, such an arrangement can provide passive venting through the gap formed between the portions of the lens 108 not in contact with the retention mechanisms 106a-106c and not in contact with the frame 104.
When fitted onto the frame 104, the first engagement portion 208a of the lens 108, comprising a laterally extending projection, can be seated within a groove or slot on the frame 104 formed by opposing walls of the retention mechanism 106a. Similarly, the second engagement portion 208b of the lens 108, comprising an angled projection, can be seated within a groove on the frame 104 formed by opposing walls within the retention mechanism 106b. The first and second engagement portions 208a, 208b can have different configurations and may be recesses, for example. The retention mechanisms can have different configurations and may be projections, for example. These passive retention mechanisms and corresponding features of the lens 108 can have a variety of configurations, including recesses, surface contours, cut-outs, projections, slots, apertures, and other such surface structures and may be formed in a variety of shapes and/or sizes. The retention mechanisms 106a, 106b are shown as a single aperture, but can be formed as a plurality of apertures.
The retention mechanisms 106a, 106b, 106c can be disposed at any point along the frame 104. Thus, although three retention mechanisms 106a, 106b, 106c are used in the embodiment of the eyeglass 100, other embodiments of the eyeglass 100 can be constructed that comprise two, four, or five or more retention mechanisms disposed along the frame 104. Moreover, while retention mechanisms 106a, 106b have been described as passive mechanisms, it is to be understood that one or both of retention mechanisms 106a, 106b can be active mechanisms. For example, one or both of retention mechanisms 106a, 106b can have structures and/or functionality similar to retention mechanism 106c.
In some embodiments, as illustrated, the door 202 of the active retention mechanism 106c is rotatable relative to the lens 108, the frame 104, and the earstem 102b; however, any other form of movement can be used instead of or in addition to rotation. In some embodiments, the retention mechanism 106c can be configured to pivot or slide relative to the frame 104 and/or earstem 102b. In some embodiments, the retention mechanism 106c can be pivotally coupled to a different portion of the frame 104. However, in the illustrated embodiment, the retention mechanism 106c is configured to rotate relative to the frame 104 and the earstem 102b to allow earstems 102a, 102b to be folded in without disengaging the retention mechanism 106c.
The passive retention mechanisms 106a, 106b can be configured such that the groove is at least partially defined by a pair of wall flanges of the frame 104. In some embodiments, the retention mechanism 106b can include a guide slot configured to align and to secure the lens at a midline of the eyeglass 100. For example, the transition from
Examples of Eyeglass Having Passive Venting
In
The eyeglass 300 can have multiple contact points where the frame 304 contacts the lens 308. These contact points can provide structural support and can be referred to as attachment points. The contact points 306a-306d can be attachment points because they provide structural support to the lens 308 or lenses 308a, 308b. The gaps 309a, 309b can be made up of a number of sub-gaps between contact points. The total gap length (e.g., the length of the gap 309a or 309b) can be the sum of the lengths of each sub-gap making up the gap 309a or 309b.
The venting angle and illumination angle formed by the lens 508 and the frame 504 cooperate to increase passive venting and reduce stray light and particulates at the user's eye. The gap can increase air flow across the posterior surface of the lens 508 while the frame 504 and lens 508 act to protect the user's eyes from light and debris.
Example Removable Lens Retention
The frame can include one or more contact points where the frame makes contact with the lens. One or more of these contact points can be attachment points, or points where the frame provides structural support to the lens (e.g., through an interference fit). An attachment point can be an active attachment point (e.g., an active retention mechanism) or a passive attachment point (e.g., a passive retention mechanism). The frame can include one or more passive attachment points and/or one or more active attachment points. In certain implementations, the attachment points can be the only locations where the lens contacts the frame of an eyewear. In various implementations, portions of the frame between the contact points do not contact the frame and form a gap between the frame and the lens to provide passive venting for the eyewear, as described elsewhere herein.
Example Active Retention Mechanism
When the active retention mechanism is locked in place, the earstem 902 can rotate freely from a folded state (e.g., approximately parallel to the frame 904) to an extended state (e.g., approximately perpendicular to the frame 904). This configuration provides a dual hinge action, wherein the door 912 has a first hinge around which it pivots and the earstem has a second hinge around which it pivots. Thus, when the door 912 is closed or locked into position, the earstem 902 can rotate without disengaging the active retention mechanism. However, when the earstem 902 is in the extended position, the door is prevented from opening. In this way, the active retention mechanism can be made to be locked so as to prevent the lens 908 from being accidentally removed from the frame 904. Similarly, when the door 912 is open and the earstem 902 is folded in, pivoting the earstem 902 to an extended position will act to close the door 912. Thus, the earstem 902 can be used to assist in locking the active retention mechanism in place to secure the lens 908.
Many other embodiments of the active retention mechanism are possible as well. For example, various systems have been designed that enable a wearer to quickly modify eyewear using replaceable components, earstems, and/or lenses, such by using the systems disclosed in U.S. Pat. Nos. 4,730,915, 5,387,949, and 7,347,545, and U.S. Publication No. 2013/0077042, the entirety of the disclosure of each of which is incorporated herein by reference. In some embodiments disclosed herein, support can be provided to a replaceable or removable lens at three or more points on the lens to enhance the ballistic resistance and lens stability of an eyeglass or goggle. Some examples of support features are shown in U.S. Pat. No. 7,954,942, issued on Jun. 7, 2011, the entirety of which is incorporated herein by reference. Further examples of support features are shown in U.S. Pat. No. 8,192,015, issued on Jun. 5, 2012, U.S. Pat. No. 8,469,510, issued on Jun. 25, 2013, and U.S. Pat. No. 8,881,316, issued on Nov. 11, 2014, the entireties of each of which are incorporated herein by reference.
Some embodiments described herein can advantageously securely retain the lens relative to the frame while generally providing passive venting capabilities along with desirable optical characteristics. For example, the lens can be secured to and/or supported by the frame in a manner that generally preserves the as-molded geometry of the lens while preventing stray light from entering the user's eye. This can be accomplished while providing gaps between the frame and the lens to provide venting. Some embodiments disclosed herein can advantageously provide an eyeglass or goggle in which the lens and/or ear stems can be easily removed and replaced by the wearer while enabling the wearer to mount the lens and providing superior ballistic resistance and lens stability.
Example Goggle
When worn, the surface of the foam component 1005 or other compressible material disposed at the rear of the goggle 1000 makes contact with the wearer's face. This wearer-contacting surface has a radius of curvature in the horizontal plane that is adapted to conform from side to side of the wearer's face.
In use, the wearer can position the goggle frame 1004 onto her face and adjust the elastic strap 1001 around the back of her head in order to firmly, but comfortably secure the goggle frame 1004 in place. The foam component 1005 is intended to contact the wearer's face and allow the goggle 1000 to conform to the surface of the wearer's face. The goggle frame 1004 can be rigid or semi-rigid. The goggle frame 1004 can be pliable and flexible to allow the lens 1008 to be easily inserted and removed. The goggle frame 1004 can include a groove around an interior portion of the goggle frame 1004 to provide a guide for the lens 1008. The lens 1008 can be positioned within the groove structure, wherein the groove structure includes one or more features that act as passive retention mechanisms to secure the lens in place during use. The goggle frame 1004 can be worn on the head of the user without the lens 1008, if so desired.
In some embodiments, the interchangeable lens structure 1008 can provide at least one interconnection point or engagement section 1010 between the lens 1008 and the retention mechanism 1006 where the lens 1008 is secured to the goggle frame 1004. The interchangeable lens structure 1010 can comprise one or more stationary structures, which can be used in combination to retain the lens 1008 in a mounted position within the goggle 1004. Other examples of an interchangeable lens structure 1008 with a goggle frame 1004 are provided in U.S. Pat. No. 8,800,067, issued Aug. 12, 2014, entitled “Eyewear with Interchangeable Lens Mechanism,” the entirety of which is incorporated herein by reference.
In some embodiments, the goggle frame 1004 can incorporate a passive venting system. For example, the goggle frame 1004 can include structures, such as gaps, similar to those described above in connection with frames 104, 304. In some embodiments, the gaps can be generally hidden from view as the frame 1004 serves to block a view of the gaps. Thus, the gaps can be part of an optically blind venting system, or a venting system that includes gaps that are not visible when viewed straight on from a reasonable distance (e.g., about a foot or so away from the goggle 1000). In some embodiments, only a portion of gaps may be visible when viewed straight on from a reasonable distance such that the gaps 309a, 309b are part of a primarily optically blind venting system.
Example Headworn Support
Any and all of the features described above with respect to embodiments and lenses, such as passive venting, passive retention mechanisms, and active retention mechanisms, may be used in other types of headworn supports including, but not limited to, helmets, face masks, balaclavas, and breaching shields.
When worn, the surface of the compressible material disposed at the inner surface of the helmet 1300 makes contact with the wearer's head including the wearer's face. This wearer-contacting surface has a radius of curvature in the horizontal plane that is adapted to conform from side to side of the wearer's face.
A portion of the helmet frame 1304, such as a portion of the brow, such as a brim 1305, can include a pliable and flexible portion to allow the lens 1308 to be easily inserted and removed. The brow 1305 can include a groove around an interior portion of the brow 1304 to provide a guide for the lens 1308. The lens 1308 can be positioned within the groove structure, wherein the groove structure includes one or more features that act as passive retention mechanisms to secure the lens in place during use. The helmet frame 1304 can be worn on the head of the user without the lens 1308, if so desired.
Example Headworn Support Kits
In some instances, the lenses described herein can be interchangeably used with a variety of different headworn supports each having a different structure and function including, but not limited to, helmets, face masks, balaclavas, breaching shields, and eyewear such as eyeglasses and goggles. For example, in some instances, the same lens can be interchangeably used with a helmet, goggles, and/or an eyeglass. A particular lens can be utilized with any other combination of two or more different headworn supports. This can beneficially allow the wearer to utilize a single lens with a variety of different headworn supports depending on the particular activity. For example, the wearer may utilize the lens with a cycling helmet when biking and switch the lens onto an eyeglass when off the bike. In some instances, the wearer may later switch the lens from the eyeglass and onto a snow helmet, goggle, or balaclava for skiing.
Example Ballistic Performance
Some embodiments of the eyewear described herein can provide desirable and advantageous passive venting functionality. In addition or in the alternative, the disclosed eyewear can provide increased lens stability and ballistic resistance. This may be due at least in part to the retention system implemented with the lens and frames. For example, by allowing a lower edge of the lens to float free from the frame, impact on the lens can cause the lens to deform and absorb the impact due at least in part to a tympanic response to the impact. This can allow the lens to deform rather than shatter, which may otherwise be the case if the lens were rigidly attached around the entirety of the perimeter of the lens. The gaps that provide the passive venting can also act to provide desirable ballistic performance.
Some embodiments of the eyeglass disclosed herein can help the lens to resist becoming transitorily and/or permanently substantially separated from the frame in response to a ballistic event. Some embodiments of the eyeglass can be configured such that a force transmitted to the lens is substantially entirely transmitted to the frame of the eyeglass while substantially maintaining engagement between the lens and the frame. For example, although the lens of such an eyeglass may be damaged (cracked or chipped), the lens avoids shattering or displacing relative to the frame. This ballistic resistance can provide excellent protection to the wearer.
In some embodiments, the goggles and eyeglasses described herein can be impact resistant. For example, the eyewear can be configured to resist ballistic impacts, for example, for combat uses. The frames can be configured to retain the lens in the event of an impact on the lens and to allow the lens to deform without shattering. The active retention mechanism can be configured to remain in the closed position in the event of an impact on the lens due to the interaction with the earstem, as described herein.
In some embodiments, the eyewear, such as eyeglasses described herein, can conform to the American National Standard for Occupational and Educational Personal Eye and Face Protection Devices standard ANSI/ISEA Z87.1-2010. For example, the eyewear can be configured to resist impact from a 6.35 mm (0.25 in.) diameter steel ball traveling at about 150 ft/s. In such a situation, the eyewear can be configured to prevent contact of the ball with the eye of a user. Similarly, the eyewear disclosed herein can conform to the Performance Specification for the Military Combat Eye Protection (MCEP) System standard MIL-PRF-32432(GL). For example, the eyewear can be configured to resist impact from a 0.15 caliber, 5.85 grain, T37 shaped projectile (e.g., a cylindrical-shaped, chamfered-edge fragment) at 640 to 660 ft/sec (e.g., about 650 ft/sec) at normal incidence to the primary lens without cracking, fracturing, or shattering, without being penetrated, or without having one or more fragments dislodging, etc.
Terminology
Conditional language used herein, such as, among others, “can,” “could,” “might,” “may,” “e.g.,” and the like, unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without other input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment. The terms “comprising,” “including,” “having,” and the like are synonymous and are used inclusively, in an open-ended fashion, and do not exclude additional elements, features, acts, operations, and so forth. Also, the term “or” is used in its inclusive sense (and not in its exclusive sense) so that when used, for example, to connect a list of elements, the term “or” means one, some, or all of the elements in the list.
Disjunctive language such as the phrase “at least one of X, Y, Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to present that an item, term, etc., may be either X, Y, or Z, or any combination thereof (e.g., X, Y, and/or Z). Thus, such disjunctive language is not generally intended to, and should not, imply that certain embodiments require at least one of X, at least one of Y, or at least one of Z to each be present.
While the above detailed description has shown, described, and pointed out novel features as applied to various embodiments, it can be understood that various omissions, substitutions, and changes in the form and details of the devices or algorithms illustrated can be made without departing from the spirit of the disclosure. Any structure, feature, step, or process disclosed herein in one embodiment can be used separately or combined with or used instead of any other structure, feature, step, or process disclosed in any other embodiment. Also, no structure, feature, step, or processes disclosed herein is essential or indispensable; any may be omitted in some embodiments. The scope of certain embodiments disclosed herein is indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
This application claims priority to U.S. Provisional App. No. 62/239,740 filed Oct. 9, 2015, titled EYEWEAR WITH PASSIVE VENTING AND REMOVABLE LENS, which is hereby incorporated herein by reference in its entirety and is to be considered a part of this specification.
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