The present invention relates to an eyeglass lens processing apparatus for processing a peripheral edge of an eyeglass lens.
A high curve frame having large curvature has been mainly used for sunglasses, but a demand for using a corrective lens together with the high curve frame has been increased. Since it is necessary to use an eyeglass lens having large curvature in case of fitting a lens into the high curve frame, it is desirable to form a high curve bevel in the peripheral edge of the lens so as to correspond to the curvature of the frame. As a method of forming a high curve bevel while restricting bevel thinning (a phenomenon in which a width or a height of the bevel becomes small), a method of separately processing a front slope and a rear slope of a bevel is disclosed (Japanese Patent Application Laid-Open No. H11-48113 (U.S. Pat. No. 6,089,957)), and a method of forming a bevel using a beveling grindstone having a diameter smaller than that of a large-diameter beveling grindstone used for a general beveling is disclosed (Japanese Patent Application Laid-Open No. 2004-74346 and Japanese Patent Application Laid-Open No. 2005-74560 (EP 1510290A1)).
Incidentally, in some cases, the high curve frame mainly used for the sunglasses is provided with a portion in which a side wall Fb formed on a rear surface side of the lens is larger than a side wall Fa formed on a front surface side of the lens as shown in
A technical object of the invention is to provide an eyeglass lens processing apparatus capable of easily carrying out a processing, in which a corrective lens is fitted into a high curve frame having a protrusion portion on a rear surface side of the lens, without operator's particular skill.
In order to achieve the object, the present invention provides the following arrangements.
(1) An eyeglass lens processing apparatus comprising:
a lens chuck shaft which holds and rotates an eyeglass lens;
a lens edge position detection unit which detects edge positions of a front surface and a rear surface of the lens on the basis of target lens shape data;
a processing tool which processes a peripheral edge of the lens and includes a roughing tool, a beveling tool and a bevel-modifying tool, the bevel-modifying tool including a grindstone or a cutter and removing a part of a bevel shoulder and/or a bevel slope on the rear surface side of the lens subjected to beveling;
a selection unit which is used to select a processing mode including a high curve beveling mode for forming a bevel in the lens fitted into a high curve frame having a protrusion portion in which a side wall of the frame on the rear surface side of the lens is larger than a side wall of the frame on the front surface side of the lens;
a modifying portion data input unit which is used to input data of a portion to be modified in a region of the bevel slope and/or the bevel shoulder so as to prevent an interference between the lens and the protrusion portion of the high curve frame, and includes a display and an input unit used for inputting data in accordance with and a screen on the display, or a receiving unit for receiving data of the protrusion portion of the high curve frame;
a calculation unit which obtains a bevel path of the bevel to be formed in the peripheral edge of the lens on the basis of the edge positions of the front surface and the rear surface of the lens obtained by the edge position detection units, obtains beveling data for the beveling tool, and obtains bevel-modifying data for the bevel-modifying tool on the basis of the bevel path and the data of the modifying portion, in the high curve beveling mode; and
a processing control unit which performs the beveling to the peripheral edge of the lens by the beveling tool in accordance with the beveling data, and removes a part of the bevel shoulder and/or the bevel slope on the rear surface side of the lens by the bevel-modifying tool in accordance with the bevel-modifying data.
(2) The eyeglass lens processing apparatus according to (1), wherein the modifying portion data input unit includes a screen used to input data in a depth and a distance in a direction toward the rear surface side of the lens of the modifying portion with respect to a bevel top point formed in the lens.
(3) The eyeglass lens processing apparatus according to (1), wherein the bevel-modifying tool includes a chevron shape processing tool which includes a first processing surface for forming a part of the modifying portion in the lens so as to be substantially perpendicular to the lens chuck shaft and a second processing surface for forming a part of the modifying portion in the lens so as to be substantially parallel to the lens chuck shaft.
(4) The eyeglass lens processing apparatus according to (1), further comprising a grooving tool for forming a groove in the peripheral edge of the lens or a drilling tool for drilling a refractive surface of the lens,
wherein the grooving tool or the drilling tool is used as the bevel-modifying tool.
Hereinafter, an exemplary embodiment of the invention will be described with reference to the accompanying drawings.
A carriage portion 100 is mounted onto a base 170 of a processing device body 1. An eyeglass lens LE to be processed is held (chucked) by lens chuck shafts (lens rotating shafts) 102L, 102R of a carriage 101, and a peripheral edge of the lens is pressed and processed by a grindstone group 168 coaxially attached to a grindstone spindle 161a. The grindstone group 168 includes a roughing grindstone 162 for a glass, a high curve bevel-finishing (beveling) grindstone 163 having a bevel slope to form a bevel in a high curve lens, a finishing grindstone 164 having a V groove (bevel groove) VG to form a bevel in a low curve lens and a flat processing surface, a flat polishing grindstone 165, and a roughing grindstone (roughing tool) 166 for plastic. The grindstone spindle 161a is rotated by a motor 160.
The lens chuck shaft 102L is held by a left arm 101L of the carriage 101 and the lens chuck shaft 102R is held by a right arm 101R of the carriage 101 rotatably and coaxially. The lens chuck shaft 102R is moved toward the lens chuck shaft 102L by a motor 110 attached to the right arm 101R, and the lens LE is held by the two lens chuck shafts 102R and 102L. Further, the two lens chuck shafts 102R and 102L are rotated in synchronization with each other by a motor 120 attached to the left arm 101L through a rotation transmission mechanism such as a gear. Accordingly, a lens rotating mechanism is configured in this manner.
The carriage 101 is mounted on a movement support base 140 capable of moving in an X-axis direction along shafts 103 and 104 extending in parallel to the lens chuck shafts 102R, 102L and the grindstone spindle 161a. A ball screw (not shown) extending in parallel to the shaft 103 is attached to the rear portion of the support base 140, and the ball screw is attached to a rotating shaft of an X-axis movement motor 145. By the rotation of the motor 145, the carriage 101 as well as the support base 140 is linearly moved in an X-axis direction (an axial direction of the lens chuck shaft). Accordingly, these components constitute an X-axis direction movement unit. The rotating shaft of the motor 145 is provided with an encoder 146 for detecting the X-axis direction movement of the carriage 101.
The support base 140 is fixed with shafts 156 and 157 extending in a Y-axis direction (a direction in which the axis-to-axis distance between the lens chuck shafts 102R, 102L and the grindstone spindle 161a is changed). The carriage 101 is mounted on the support base 140 so as to be movable in a Y-axis direction along the shafts 156 and 157, A Y-axis movement motor 150 is fixed to the support base 140. The rotation of the motor 150 is transmitted to a ball screw 155 extending in a Y-axis direction, and the carriage 101 is moved in a Y-axis direction by a rotation of the ball screw 155. Accordingly, a Y-axis movement unit is configured in this manner. A rotating shaft of the motor 150 is provided with an encoder 158 as a detector for detecting a movement of the carriage 101 in a Y-axis direction.
In
A rack 211F is fixed to a lower end portion of the slide base 210F. The rack 211F meshes with a pinion 212F of an encoder 213F fixed to the attachment support base 201F. A rotation of a motor 216F is transmitted to the rack 211F via a gear 215F, an idle gear 214F, and the pinion 212F, thereby moving the slide base 210F in an X-axis direction. During the measurement of the lens edge position, the motor 216F presses the measurement portion 206F against the lens LE at the same force all the time. The pressing force of the measurement portion 206F applied from the motor 216F to the lens refractive surface is set to a small force in order to prevent a scratch of the lens refractive surface. As means for applying a pressing force of the measurement portion 206F against the lens refractive surface, pressure applying device such as a spring may be employed. The encoder 213F detects the movement position of the measurement portion 206F in an X-axis direction by detecting the movement position of the slide base 210F. On the basis of the movement position information, the rotating angle information of the lens chuck shafts 102L, 102R, and the Y-axis movement information, the edge position of the front surface of the lens LE (and the lens front surface position) is measured.
Since a configuration of the measurement portion 200R for measuring the edge position of a rear surface of the lens LE is symmetric to the configuration of the measurement portion 200F, “F” of the reference numerals given to the components of the measurement portion 200F shown in
During the measurement of the lens edge position, the measurement portion 206F comes into contact with the front surface of the lens, and the measurement portion 206R comes into contact with the rear surface of the lens. When the carriage 101 is moved in a Y-axis direction and the lens LE is rotated on the basis of lens shape data (target lens data) in this state, the edge positions of the front surface and the rear surface of the lens are measured for processing a peripheral edge of the lens.
In
A grindstone rotating motor 321 is fixed to the large gear 313, and the motor 321 is rotated together with the large gear 313. A rotating shaft of the motor 321 is connected to a shaft 323 rotatably held in the inside of the arm rotating member 310. A pulley 324 is attached to an end of the shaft 323 extending up to the inside of the arm 320. A hold member 331 for rotatably holding a grindstone spindle 330 is fixed to a front end of the arm 320. A pulley 332 is attached to a left end of the grindstone spindle 330. The pulley 332 is connected to the pulley 324 by a belt 335, thereby transmitting a rotation of the motor 321 to the grindstone spindle 330. The grindstone spindle 330 is attached with a lens-rear-surface chamfering grindstone 341a, a lens-front-surface chamfering grindstone 341b, and a grooving grindstone 342 as a grooving tool. The grooving grindstone 342 is also used as a processing tool for bevel-modifying the lower portion of the slope on the rear surface side of the bevel. The grindstone spindle 330 is disposed so as to be inclined at an angle α (for example, the angle α is 8°) with respect to an axial direction of the lens rotating shafts 102L and 102R, thereby easily carrying out the grooving using the grooving grindstone 342 along the lens curve. The chamfering grindstone 341a, the chamfering grindstone 341b, and the grooving grindstone 342 are formed in a circular shape, and an outer-diameter dimension is about 30 mm.
During the grooving and the chamfering, the arm 320 is rotated by the pulse motor 305, and the grindstone portion 340 is moved from the retraction position to the processing position. The processing position of the grindstone portion 340 corresponds to a position in which the grindstone spindle 330 is located between the lens rotating shafts 102L, 102R and the grindstone spindle 161a on a plane where the lens rotating shafts 102L, 102R and the grindstone spindle 161a are located. Accordingly, in the same manner as the lens peripheral edge processing by the grindstone group 168, it is possible to change a distance between the lens rotating shafts 102L, 102R and the rotating shaft 330 by the motor 150.
A drilling mechanism portion 800 is disposed in rear of the carriage portion 100.
Further, X-axis movement unit and Y-axis movement unit of the eyeglass lens processing apparatus shown in
Next, a configuration of the grindstone group 168 will be described.
Regarding the beveling V groove of the low curve finishing grindstone 164, an angle Lαf of a front surface processing slope and an angle Lαr of a rear surface processing slope in an X-axis direction are set to 35° in order to have a good external appearance in case of fitting the lens into the frame having a gentle curve. A depth of the V groove VG is less than 1 mm.
The high curve bevel-finishing grindstone 163 includes a front surface beveling grindstone 163F for processing a bevel slope on the front surface side of the lens LE, a rear surface beveling grindstone 163Rs for processing a bevel slope on the front surface side of the lens LE, and a rear-surface-bevel-shoulder processing slope 163Rk for forming a bevel shoulder on the rear surface side of the lens. These grindstones are integrally formed in the present apparatus, but may be separately provided.
An angle αf of the front surface beveling grindstone 163F in an X-axis direction is gentler than the angle Lαf of the front surface processing slope of the finishing grindstone 164, and is set to, for example, 30°. Meanwhile, an angle αr of the rear surface beveling grindstone 163Rs in an X-axis direction is larger than the angle Lαr of the rear surface processing slope of the finishing grindstone 164, and is set to, for example, 45°. Then, an angle αk of the rear-surface-bevel-shoulder processing slope 163Rk in an X-axis direction is larger than an angle (0° in
A width w163F of the front surface beveling grindstone 163F in an X-axis direction is set to 9 mm, and a width w163Rs of the rear surface beveling grindstone 163Rs is set to 3.5 mm. Since the front surface bevel slope and the rear surface bevel slope are separately processed in case of the high curve lens, the width is larger than that of the low curve finishing grindstone 164 in order to prevent an interference therebetween. A width w163Rk of the rear-surface-bevel-shoulder processing slope 163Rk is set to 4.5 mm. In the present embodiment, the grindstone is used as a roughing tool and a beveling tool for forming a bevel, but a cutter may be used.
An operation of the apparatus having the above-described configuration will be described. First, an operator inputs the target lens data of an eyeglass frame F. The target lens data of the eyeglass frame F measured by the eyeglass frame shape measurement portion 2 is input by pressing a switch of the switch portion 7, and is stored in the memory 51. A lens shape figure FT based on the input target lens data is displayed on a screen 500a of the display 5. Then, it becomes a state capable of inputting layout data such as a wearer's pupillary distance (PD value), a frame pupillary distance (FPD) of the eyeglass frame F, and a height of an optical center with respect to a center of a lens shape. The layout data is input by operating a predetermined touch key displayed on the screen 500b. A processing condition such as a lens material, a frame type, a processing mode, and a chamfering is selected by touch keys 510, 511, 512, and 513. In the processing mode using the touch key 512, the modes of a guided beveling, a high curve beveling, a flat edging, a grooving, and a drilling are selected. When the high curve beveling mode is selected by the touch key 512, it is possible to further select a processing mode (hereinafter, referred to as a bevel-modifying mode) for removing a part of the bevel shoulder and/or the bevel slope on the rear surface side of the lens by a touch key 514. As shown in
Upon completing the data input necessary for the processing, the operator chucks the lens LE by the lens chuck shafts 102R and 102L, and operates the switch portion 7 by pressing a start switch. The control portion 50 operates the lens edge position measurement portions 200F and 200R in response to the start signal, and measures the edge positions of the front surface and the rear surface of the lens on the basis of the target lens data. The measurement positions of the front surface and the rear surface of the lens are, for example, a bevel top point position and an outside position away from the bevel top point position by a predetermined distance (0.5 mm). Subsequently, the control portion 50 carries out a bevel calculation throughout the whole circumference of the peripheral edge of the lens so as to obtain a bevel top point path on the basis of the edge position information. The configuration, the measurement operation, the bevel calculation, and the like of the lens edge position measurement portions 200F and 200R are shown in Japanese Patent Application Laid-Open No. H05-212661 (U.S. Pat. No. 5,347,762) and the like. The bevel top point path data obtained by the bevel calculation are denoted by (rn, θn, and Hn) (n=1, 2, 3, . . . , N). “rn” denotes a radial length of the target lens data, “θn” denotes a radial angle of the target lens data, and “Hn” denotes a bevel top point position data in a direction of the lens chuck shaft (in an X-axis direction).
Here, when the high curve beveling mode is selected, the bevel top point path is equal to an imitative curve of the front surface curve of the lens. The front surface curve of the lens is obtained from the front surface shape of the lens measured by the lens edge position measurement portion 200F. An initial value of the bevel top point position is set to a position in rear of the edge position of the front surface of the lens by a predetermined distance (for example, 0.3 mm). When the high curve beveling mode is selected, the bevel slope on the front surface side of the lens and the bevel slope on the rear surface side of the lens are processed by the front surface beveling grindstone 163F and the rear surface beveling grindstone 163Rs, respectively.
When the bevel calculation is carried out by the control portion 50, a bevel simulation screen 600 shown in
Edit boxes 620, 621, and 622 are provided at a lower portion of the screen 600 so as to input a bevel curve, a bevel top point position, and a bevel height thereto. The bevel height in the edit box 622 is provided to input a height h (see
Then, when the bevel-modifying mode is selected, edit boxes 623 and 624 used for inputting position data of the modifying portion 611 for the bevel top point VTP are displayed. The display 5 is used as a unit used for inputting data of the modifying portion 611. In order to fit the corrective lens into the frame F having the protrusion portion BH on the rear surface side of the lens shown in
A path data calculation of the modifying portion 611 formed in the peripheral edge of the lens subjected to the beveling will be described with reference to
The bevel slope VSr on the rear surface side of the lens is processed by the rear surface beveling grindstone 163Rs so as to have an angle αr with respect to an X-axis direction. When the bevel top point path data are denoted by (rn, θn, and Hn) (n=1, 2, 3, . . . , N), the path data of the bevel-modifying start point ST on the bevel slope VSr is calculated by the control portion 50 by (rn−Δx·tan αr, θn, and Hn+Δx) (n=1, 2, 3, . . . , N). The bevel-modifying depth data Dy from the bevel top point position VTP is calculated by (Δx·tan αr+Δy). Further, the modifying portion 611 on the rear surface side of the lens is obtained so that the cutting is carried out up to the rear-surface-side edge of lens in an X-axis direction. As shown in
In
After the necessary data are input and checked by the bevel simulation screen, when a processing start switch of the switch portion 7 is pressed, the periphery of the lens LE is processed. First, the carriage 101 is moved so that the lens LE is located at a position of the plastic roughing grindstone 166, and the Y-axis movement motor 150 is controlled by the roughing control data based on the target lens shape data, thereby roughing the peripheral edge of the lens LE.
Subsequently, the beveling is carried out. When the high curve beveling mode is selected, the bevel slope on the front surface side of the lens and the bevel slope on the rear surface side of the lens are processed by the front surface beveling grindstone 163F and the rear surface beveling grindstone 163Rs, respectively. First, the carriage 101 is moved so that the lens LE is located at the position of the front surface beveling grindstone 163F. Subsequently, the X-axis movement motor 145 and the Y-axis movement motor 150 are controlled to be driven in accordance with the front surface beveling control data obtained on the basis of the bevel top point path data, and the bevel slope VSf on the front surface side of the lens is processed by the grindstone 163F by rotating the lens LE. Subsequently, the lens LE is moved to be located at the position of the rear surface beveling grindstone 163Rs. The X-axis movement motor 145 and the Y-axis movement motor 150 are controlled to be driven on the basis of the rear surface beveling control data, and the bevel slope VSr on the rear surface side of the lens is processed by the grindstone 163Rs by rotating the lens LE. When it is selected that the bevel shoulder is formed in the rear surface of the lens, the movement of the lens LE is controlled so that a bevel bottom Vbr is located at an intersection point 163G of the rear surface beveling grindstone 163Rs and the rear-surface-bevel-shoulder processing slope 163Rk. Accordingly, even in the high curve lens such as 8 curve as a curve value of the lens, the bevel is formed by restricting a bevel thinning (a phenomenon in which a width or a height of the bevel becomes small). As the calculation of the processing control data of the front surface bevel slope using the grindstone 163F and the processing control data of the rear surface bevel slope using the grindstone 163Rs, and the processing operation thereof, basically, the technique disclosed in Japanese Patent Application Laid-Open H11-48113 (U.S. Pat. No. 6,089,957) can be used, and thus the description thereof will be omitted.
When the beveling completes, the bevel-modifying is carried out by the mechanism portion 300 having the grooving grindstone 342. First, in the same manner as the grooving, the arm 320 is rotated by the pulse motor 305, thereby moving the grooving grindstone 342 from the retraction position to the processing position. The bevel-modifying control data is calculated by the control portion 50 on the basis of the bevel path data (rn, θn, and Hn) (n=1, 2, 3, . . . , N) and the position data (x and (y (or Dy) of the modifying portion 611 with respect to the bevel top point VTP.
A calculation of the bevel-modifying control data will be described. As shown in
In a case where the width of the modifying portion 611 up to the lens edge CMe on the rear surface side of the lens is larger than the width W of the grooving grindstone 342, since the modifying portion cannot be completely formed just by rotating the lens LE once, the modifying portion is formed by rotating the lens LE a plurality of times. In this case, for example, in order to move the lens chuck shafts 102L and 102R by a distance shorter than the grindstone width W in a direction indicated by the arrow B (in a direction toward the front surface side of the lens) whenever the lens LE rotates once, the control data in an X-axis direction is obtained. For example, in order to move the lens chuck shafts by a distance of ⅓ of the grindstone width W (in case of W of 0.6 mm, the movement distance is 0.2 mm), the control data in an X-axis direction is obtained. The lens end CMe is obtained by the angle (r of the bevel slope VSr on the rear surface side of the lens and the depth data (y (or Dy). In a case where the bevel shoulder is formed on the rear surface side of the lens, the edge position on the rear surface of the lens measured by the lens edge position measurement portion 200R is the lens end CMe.
Since the reason of forming the modifying portion 611 is to prevent interference between the protrusion portion BH of the frame F and the lens, it is not necessary to high-precisely obtain the path of the modifying portion 611 like the beveling or the grooving. Simply, after obtaining the movement control data in an X-axis direction and the control data of the distance Lgi between shafts in a Y-axis direction by ensuring the bevel path data (rn, θn, and Hn) (n=1, 2, 3, . . . , N) at an outer-diameter shoulder portion 342C (a side angular portion located on the front surface side of the lens) of the grooving grindstone 342, the control data in an X-axis direction is made to be shifted to the rear surface side of the lens by (x, and the control data of the distance Lgi between shafts in a Y-axis direction is made to be shorter by the depth Dy. That is, when the control data upon ensuring the bevel path data is denoted by (LYgi, HYi, and θi) (i=1, 2, 3, . . . , N), the control data of the first modifying portion is obtained by (LYgi-Dy, HYi+(x, and θi,) (i=1, 2, 3, . . . , N). Then, in order to carry out the bevel-modifying up to the lens end CMe by the grooving grindstone 342, the control data for moving the lens chuck shafts 102L and 102R in a direction indicated by the arrow B whenever the lens rotates once is obtained.
On the basis of the control data obtained as described above, the control portion 50 controls the motor 120 for rotating the lens chuck shafts 102L and 102R, and controls the motors 145 and 150 respectively moving the lens chuck shafts 102L and 102R in an X-axis direction and a Y-axis direction. Accordingly, the modifying portion 611 is processed by the depth Δy by the grooving grindstone 342 by ensuring the processing start point ST. In a case where the modifying portion 611 is thicker than the width W of the grooving grindstone 342, the modifying portion 611 ensured up to the lens end CMe is processed by the grooving grindstone 342 by moving the lens chuck shafts 102L and 102R in a direction indicated by the arrow B on the basis of the grindstone width W whenever the lens LE rotates once.
As shown in
In
In the above description, the grindstone 342 is used as the bevel-modifying tool, but a cutter may be used instead of the grindstone 342. As the bevel-modifying mechanism, a type may be employed in which the rotating shaft mounted with the grindstone or the cutter is moved in a Y-axis direction and an X-axis direction, instead of the type in which the lens chuck shafts 102R and 102L are moved in a Y-axis direction and an X-axis direction.
The bevel-modifying mechanism portion, which is also used as the drilling mechanism portion 800, may be employed.
In
A rotating portion 830 is attached to a front end portion of the rotating support base 810. A rotating shaft 831, disposed in a direction perpendicular to an axial direction of the rotating support base 810, is rotatably supported to the rotating portion 830. An end mill 835 as a drilling tool is coaxially attached to one end of the rotating shaft 831. The end mill 835 has a diameter of 0.8 mm which is suitable for the drilling. Then, the end mill 835 is also used as a bevel-modifying tool. A grooving cutter 836 as a grooving tool is coaxially attached to the other end of the rotating shaft 831. In a case where the grooving tool is provided in the mechanism portion 300 shown in
Next, a bevel-modifying operation using the end mill 835 will be described with reference to
After the beveling, when the bevel-modifying is carried out, the control portion 50 controls the motor 805 to be driven, and controls the rotating portion 830 to move from a retraction position to a processing position. Subsequently, when the motor 816 is driven, as shown in
In
At the initial position upon starting the processing, the lower portion of the bevel slope VSr is processed by the depth Δy by the rotation of the end mill 835 by moving the lens chuck shafts 102L and 102R toward the end mill 835 in a Y-axis direction in a state where the lens LE does not rotate. Subsequently, the modifying portion 611 is processed throughout the whole circumference of the lens LE so as to have a width corresponding to the diameter of the end mill 835 by moving the lens chuck shafts 102L and 102R in a Y-axis direction and an X-axis direction in accordance with the control data in a Y-axis direction and an X-axis direction while rotating the lens LE. In a case where the modifying portion 611 is not cut out just by one rotation of the lens LE, in the same manner as the processing using the grooving grindstone 342 described above, the lens LE is moved in a direction indicated by the arrow B until the cutting is carried out up to the lens end CMe of the bevel slope VSr. Subsequently, the modifying portion 611 is processed throughout the whole circumference of the lens LE by the end mill 835 by moving the lens chuck shafts 102L and 102R in a Y-axis direction and an X-axis direction in accordance with the control data in a Y-axis direction and an X-axis direction while rotating the lens LE again.
Another modified example will be described.
In
The grindstone 853 disposed on the front surface side of the lens is also used as the bevel-modifying tool. For this reason, it is desirable that the conical surface 853c of the grindstone 853 is formed to have a width of 3 mm or more. It is desirable that an end surface 853a on the front surface side of the lens is formed on the grindstone surface. That is, the grindstone 853 is used as the bevel-modifying tool having a chevron shape and including a processing surface (853c) for forming the modifying portion in the lens so as to substantially parallel to the lens chuck shaft and a processing surface (853a) for forming the modifying portion in the lens so as to be substantially perpendicular to the lens chuck shaft.
In a case where the beveling is performed to the lens LE by the small-diameter beveling grindstone 850 shown in
Next, the bevel-modifying using the grindstone 853 of the small-diameter beveling grindstone 850 will be described with reference to
In
In
Even in the corrective lens, by carrying out the bevel-modifying as described above, it is possible to fit the lens into the high curve frame having the protrusion portion BH on the rear surface side of the lens as shown in
Furthermore, in the above description, the edit boxes 623 and 624 on the screen shown in
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