The present invention relates to a dome camera having a dome cover covering a camera lens, and particularly to a fixed-type dome camera having a camera lens whose direction is manually set.
Dome cameras are generally categorized into two types: fixed-type dome cameras and movable-type dome cameras. The fixed-type dome camera has a fixed direction of a camera lens in a certain direction once the direction of the camera lens is manually set in this direction at the time of the installation, and the camera picks up a camera image in this set (fixed) direction. Specifically, in the fixed-type dome camera, the direction of the camera lens is adjustable in a certain angular range, so that the camera lens can be directed toward a target direction when the camera is installed. This angular range is an angular range where the direction of the camera lens can be adjustable during installing the camera, and may also be referred to as an “acceptable setting range”. Once the direction of the camera lens is set in a certain direction, the camera lens is fixed to be directed in this direction (set direction). Such a fixed-type dome camera may be used in surveillance in a predetermined area using a single camera.
In the movable-type dome camera, a camera lens is electrically adjustable (using a pan motor or a tilt motor, etc.) even after the camera is installed. Hence, the movable-type dome camera does not employ a manual setting of the direction of the camera lens, as the fixed-type dome camera does. Specifically, the direction of the camera lens is adjustable within a visible range to be directed in a desired direction after the camera is installed. The “visible range” denotes an angular range where the direction of the camera lens can be changed after the camera is installed, and the visible range of the movable-type dome camera may be set such that: “the pan direction: 360° (0° to 360°), the tilt direction: 75° (0° to 75°”. Meanwhile, in the fixed-type dome camera, the direction of the camera lens is unchangeable after the camera is installed; therefore, the visible range may be set such that: “the pan direction: ±0°, the tilt direction: ±0°”. Not to mention that the concept of the “visible range” is quite different from the concept of the aforementioned “acceptable setting range”.
The fixed-type dome camera is relatively inexpensive, but there is limitation that a single camera can monitor only one area. To the contrary, the movable-type dome camera is relatively expensive, but multiple areas can be monitored using a single camera. As mentioned above, the dome cameras are categorized into two types: the fixed type and the movable type, and the present invention relates to the fixed-type dome camera having a camera lens whose direction is fixed manually.
Conventional fixed-type dome cameras employ semispherical dome covers. Taking the lens effect of a dome cover into account, a camera image in higher quality can be obtained by bringing an optical axis of the camera lens to pass through the spherical center of the dome cover. However, a conventional dome camera causes vignetting if the direction of its camera lens exceeds a certain angle (inclination limit angle) when the camera is set in the horizontal direction (horizontal direction if the summit direction of the dome is directed upward) or in the depression angle direction (more downward direction than the horizontal direction if the summit direction of the dome is directed upward) with its camera lens tilted. For this reason, the acceptable setting range of the conventional fixed-type dome camera is limited within a range of 0° (summit direction of the dome) to 75° (inclination limit angle) in the tilt direction.
There is suggested a conventional fixed-type dome camera that can tilt its camera lens at the depression angle direction (see Patent Literature 1, for example). In this conventional dome camera, the tilt direction of the camera lens in the horizontal direction or in the depression angle direction can be attained by deviating the position of an optical axis of the camera lens from a spherical center of a dome cover, which means that the tilt direction of the camera lens can be defined within a broader angular range.
Unfortunately, in such a conventional dome camera, the position of the optical axis of the camera lens is deviated from the spherical center of the dome cover if the tilt direction of the camera lens is set in the horizontal direction or in the depression angle direction; therefore, quality of a camera image becomes deteriorated due to the lens effect of the dome cover. Consequently, it is extremely difficult to cope with allowing the setting of the tilt direction of the camera lens in a broader angular range (even in the horizontal direction or in the depression angle direction) and realizing a camera image in high quality even if the tilt direction of the camera lens is set in the horizontal direction or in the depression angle direction.
Patent Literature 1: Japanese Patent Laid-Open No. 2005-221637
An object of the present invention, which has been made under the aforementioned background, is to provide a dome camera capable of setting a tilt direction of a camera lens in a broader angular range (even in the horizontal direction or in the depression angle direction), and realizing a camera image in high quality even if the tilt direction of the camera lens is set in the horizontal direction or in the depression angle direction.
One aspect of the present invention provides a dome camera having a camera lens, a direction of the camera lens being manually set, and this dome camera includes a base having a parallel support face parallel to an installation face to which the dome camera is installed; the camera lens provided on the base so as to be rotatable in a tilt direction and in a pan direction; an inner cover supported on the parallel support face so as to cover the camera lens; and a semispherical dome cover covering the inner cover, wherein the pan direction of the camera lens has a predefined target direction to be set, the inner cover is rotatable in the pan direction relative to the base, so as to be directed in the target direction, and the inner cover has an inclined support plane on which the dome cover is supported in such a manner that a summit direction of the dome cover is inclined at a predetermined inclination angle from a direction vertical to the installation face, the dome cover has an acceptable tilt setting range from the summit direction of the dome cover to a predetermined inclination limit angle, the tilt direction of the camera lens is set within an angular range from the direction vertical to the installation face to an enlarged inclination limit angle defined by adding the inclination angle to the inclination limit angle of the dome cover, and an optical axis of the camera lens passes through a spherical center of the dome cover.
As explained hereinafter, the present invention also includes another aspect. Therefore, the disclosure of the present invention is intended to provide a part of the aspects, and it is not intended to limit the scope of the present invention set forth and claimed herein.
Detailed description of the present invention will be provided, hereinafter. The present invention is however not limited to the following detailed description and the accompanying drawings.
The dome camera of the present invention is a dome camera having a camera lens whose direction is set manually, and includes: a base having a parallel support face that is horizontal to an installation face to which the dome camera is installed; the camera lens provided on the base, and rotatable in the tilt direction and in the pan direction; an inner cover supported on the parallel support face so as to cover the camera lens; and a semispherical dome cover that covers the inner cover, wherein the pan direction of the camera lens has a predefined target direction to be set, the inner cover is manually rotated relative to the base in the pan direction, so as to be directed in the target direction, and the inner cover has an inclined support plane on which the dome cover is supported in such a state that the summit direction of the dome cover is inclined at a predetermined inclination angle from the vertical direction relative to the installation face for the dome cover, so that the dome cover has an acceptable tilt setting range from the summit direction of the dome cover to a predetermined inclination limit angle, the tilt direction of the camera lens can be set in an angular range from an angle corresponding to the vertical direction relative to the installation face to an enlarged inclination limit angle defined by adding the inclination angle to the inclination limit angle of the dome cover, and the optical axis of the camera lens passes through the spherical center of the dome cover.
In this configuration, the tilt direction of the camera lens can be set in a broader angular range from the vertical direction relative to the installation face to the enlarged inclination limit angle (angle defined by adding the inclination angle to the inclination limit angle of the dome cover). For example, in a common dome camera, if the inclination limit angle of the dome cover is 75° (assuming that the summit direction is 0°), the tilt direction of its camera lens can be set only within the angular range from the summit direction)(0° to the inclination limit angle (75°, for example) of the dome cover. In the conventional dome camera (the dome camera of Patent Literature 1), the tilt angle of the camera lens can be set in a broader angular range (range from 0° to 90°, for example), but the position of the optical axis of the camera lens is deviated from the spherical center of the dome cover, resulting in deterioration of quality of a camera image due to the lens effect of the dome cover. To the contrary, the present invention predefines the target direction (direction to be set) of the pan direction of the camera lens, so that the inclination limit angle is enlarged by inclining the dome cover in the target direction. For example, if the inclination angle (inclination angle of the inclination support plane) of the dome cover is 15°, the tilt direction of the camera lens can be set in a broader range from the vertical direction relative to the installation face (0°) to the enlarged inclination limit angle (90°=75°+15°). Addition to this, the present invention can realize a camera image in high quality because the optical axis of the camera lens passes through the spherical center of the dome cover.
In the dome camera of the present invention, the inner cover and the dome cover may be combined integrally and continuously on the inclination support plane, so as to have a substantially spherical appearance.
In this configuration, the inner cover and the dome cover generally has a spherical appearance in combination of the inner cover and the dome cover on the inclination support plane, which prevents inference of the camera direction through the appearance of the dome camera.
In the dome camera of the present invention, the inner cover may include a semi-spherical portion having a window to be directed toward the target direction, and a partially spherical portion having an inclined step portion for supporting an end of the dome cover, and the spherical centers of the semi-spherical portion and the partially spherical portion may be concentric with the spherical center of the dome cover.
This configuration enables the inner cover to have a function for securing a visual field of the camera lens (function as the window), and a function for supporting the dome cover (function as the inclined step portion). In this case, one component (inner cover) has the both functions, which reduces the number of components of the dome camera.
In the dome camera of the present invention, the dome cover may have plural locking portions, and the inner cover may have plural locked portions to be engaged with the plural locking portion, and the locking portions are engaged with the locked portions so as to fix the dome cover to the inner cover.
In this configuration, the dome cover can readily be fixed to the inner cover by engaging the locking portions of the dome cover with the locked portions of the inner cover.
In the dome camera of the present invention, each locking portion may include a locking projection in an L shape extending from the end of the dome cover, each locked portion may include a locked recess provided on an inner face of the inner cover, and insertion holes may be formed in the inclined step portion of the inner cover, so that each locking projections is inserted through each insertion hole, and is engaged with each locked recesses.
In this configuration, the dome cover can readily be fixed to the inner cover by inserting the locking projections at the end of the dome cover through the insertion holes in the inclined step portion of the inner cover, so as to be engaged with the locked recesses of the inner cover.
In the dome camera of the present invention, each locking portion includes a locking hole formed in each locking projection, each locked portion includes a locked protrusion provided on each locked recess, and the locked protrusion includes an inclined face and a lock wall, and in an engagement of each locking projection with each locked recess, a periphery of the locking hole moves beyond the inclined face, and the locking hole comes into engagement with the locked protrusion, so that against an attempt of unlock the engagement between each locking projection and each locked recess, the periphery of each locking hole is locked by each lock wall, so as to prevent unlocking of the engagement between each locking hole and each locked protrusion.
In the installation of the dome cover to the inner cover, the engagement of each locking projection with each locked recess is attained such that the periphery of each locking hole moves beyond the inclined face, and each locking hole is then engaged with each locked protrusion. The dome cover is thus readily fixed to the inner cover. On the other hand, if an attempt to unlock the engagement between each locking projection and each locked recess is made so as to uninstall the dome cover from the inner cover, the periphery of the locking hole of each locking projection is locked by each lock wall, thereby preventing the unlocking of the engagement between each locking portion and each locked portion. This configuration prevents the dome cover from being readily uninstalled from the inner cover.
The dome camera of the present invention may employ the following configuration that each locking portion includes a locking hole disposed in each locking projection, and each locked portion includes a locked protrusion provided on each locked recess, and each locked protrusion includes a first inclined face and a second inclined face; in the engagement of each locking projection with each locked recess, a periphery of each locking hole may move beyond the first inclined face, and each projecting hole may come into engagement with each locked protrusion; and in the unlocking of the engagement between each locking projection and each locked recess, the periphery of each locking hole may move beyond the second inclined face, so as to unlock the engagement between each locking hole and each locked protrusion.
In the installation of the dome cover to the inner cover, the engagement of each locking projection with each locked recess is attained such that the periphery of the locking hole of each locking projection may move beyond the first inclined face, and each projecting hole comes into engagement with each locked protrusion. The dome cover is thus readily fixed to the inner cover. In the uninstallation of the dome cover from the inner cover, the unlocking of the engagement between each locking projection and each locked recess is attained such that the periphery of the locking hole of each locking projection moves beyond the second inclined face, thereby unlocking the engagement between each locking portion and each locked portion. The dome cover is thus readily uninstalled from the inner cover. In this manner, the dome cover can be detachably installed to the inner cover.
In the dome camera of the present invention, each locking projection may have a smaller thickness than that of the dome cover.
Each locking projection at the end of the dome cover has a smaller (thinner) thickness than that of the dome cover, so that each locking portion can have an appropriate flexibility. (The periphery of the locking hole of) each locking projection with an appropriate flexibility can easily moves beyond the inclined face of each locked protrusion when the dome cover is installed to the inner cover; thus, the dome cover can readily be fixed to the inner cover.
In the dome camera of the present invention, in the engagement state between each locking portion and each locked portion, the inner faces of the dome cover and the inner cover may be aligned in height.
The alignment in height of the inner faces of the dome cover and the inner cover can prevent the camera lens or the like from being caught by the inner face of the cover (the inner cover and the dome cover) even if the inner cover is rotated with the dome cover installed to the inner cover.
In the dome camera of the present invention, the end of the dome cover may have the same color as that of the inclined step portion of the inner cover.
When the dome cover and the inner cover are combined to each other, the combined portions (of the end of the dome cover and the inclined step portion of the inner cover) have the same color tone, which prevents the difference in color tone at the combined portions. The dome camera thus has a substantially spherical appearance, which prevents inference of the direction of the camera lens through the appearance of the dome camera.
In the dome camera of the present invention, the end of the dome cover may have a dark color.
When the inner cover and the dome cover are combined to each other, the end of the dome cover having a dark color (black or gray, for example) prevents the difference in color tone at the combined portions (end of the dome cover). The dome camera thus has a substantially spherical appearance, which prevents inference of the direction of the camera lens through the appearance of the dome camera.
In the dome camera of the present invention, a smoke treatment may be applied to the dome cover.
When the inner cover and the dome cover are combined to each other, the dome cover to which the smoke treatment is applied prevents the internal structure from being visible through the dome cover, which hinders inference of the direction of the camera lens through the appearance of the dome camera.
The present invention enables the setting of the tilt direction of the camera lens in a broader range, as well as realizes a camera image in high quality.
With reference to drawings, description will be provided on the dome camera according to the embodiments of the present invention, hereinafter. In the embodiments, an example of the dome camera used in a surveillance camera or other purposes will be described. The dome camera of the embodiments may be installed to a wall or a ceiling in a surveillance area, for example.
The configuration of the dome camera of the first embodiment of the present invention will be described with reference to the drawings.
As illustrated in
The base 2 includes an attachment face S2 (lower face in
As illustrated in
In this case, the direction of the camera lens 6 (the tilt direction and the pan direction) has a fixed target direction to be set. The window 8 of the inner cover 3 is directed toward the target direction of the pan direction. In other words, the window 8 thus opens toward the target direction of the pan direction (the pan direction to be set). The window 8 of the inner cover 3 opens in a range from the vertical direction)(0° relative to the installation face S1 to the enlarged inclination limit angle (90° for example, as described later) in the tilt direction. The tilt direction of the camera lens 6 is defined in the acceptable tilt setting range (in the range from 0° to 90°). In other words, this window 8 is not only directed toward the target direction of the pan direction, but also opens toward the target direction of the tilt direction (the tilt direction to be set).
The inclined step portion 10 of the inner cover 3 is located at the position of an inclined plane S4. An end 12 (an annular portion corresponding to the equatorial portion) of the dome cover 4 is supported to the inclined step portion 10. While the end 12 of the dome cover 4 is supported to the inclined step portion 10 of the inner cover 3, the inner cover 3 is supported with the summit direction of the dome cover 4 inclined by the angle θ1 from the direction of the pan axis P (the vertical direction relative to the installation face S1) (see
As illustrated in
A variable focal lens may be used as the camera lens 6, for example. The variable focal lens includes a focus adjusting lever 15 used for a manual focus adjustment, and a zoom adjusting lever 16 used for a manual zoom adjustment. The focus adjusting lever 15 is a lever for rotating a focus ring used in the focus adjustment. The zoom adjusting lever 16 is a lever for rotating a zoom ring used in the zoom adjustment. The variable focus lens is a relatively inexpensive camera lens 6, and is often used in the fixed-type dome camera 1.
With reference to
As illustrated in
Contrary to this, in the dome camera 1 of this embodiment, since the dome cover 4 is inclined by the angle θ1, the tilt direction of the camera lens 6 can be set within an angular range from the direction of the pan axis P (the vertical direction relative to the installation face S1, the upward direction of
Description will now be provided on the installation procedure of the dome camera 1 of this embodiment having the aforementioned configuration.
The dome camera 1 of this embodiment is installed to the installation face S1 in such a manner that the base assembly 18 of the dome camera 1 is fixed to the installation face S1 (such as a wall face or a ceiling face) with fixing bolts (not shown), and the direction of the camera lens 6 is adjusted. At this time, the pan direction of the camera lens 6 is manually rotated, so as to direct the pan direction of the camera lens 6 toward its target direction. The camera lens 6 is then turned in the tilt direction manually, so as to direct the tilt direction of the camera lens 6 toward its target direction. After the setting of the direction of the camera lens 6 is completed, the dome cover assembly 19 is attached to the base assembly 18. The cover 5 is rotatable relative to the base assembly 18, and the rotation of the cover 5 brings the direction of the window 8 into accordance with the direction of the camera lens 6. The focus or zoom adjustment of the camera lens 6 is appropriately conducted.
The dome camera 1 of the first embodiment of the present invention allows the setting of the tilt direction of the camera lens 6 in a broader angular range, thereby realizing a camera image in high quality.
Specifically, this embodiment allows the setting of the tilt direction of the camera lens 6 in the broader angular range from the vertical direction relative to the installation face S1 to the enlarged inclination limit angle (angle defined by adding the inclination angle θ1 to the inclination limit angle θ2 of the dome cover 4). For example, if the semi-spherical dome cover 4 has the inclination limit angle of 75° (assuming that the summit direction is 0°), a common dome camera allows the setting of the tilt direction of the camera lens 6 only in an angular range from the summit direction)(0° to the inclination limit angle (75°, for example) of the dome cover 4. In the conventional dome camera (the dome camera of Patent Literature 1), the tilt direction of the camera lens 6 can be set in a broader angular range (range from 0° to 90°, for example), but the position of the optical axis X of the camera lens 6 is deviated from the spherical center of the dome cover 4, so that quality of a camera image is deteriorated due to the lens effect of the dome cover 4.
To the contrary, in this embodiment, the target direction of the pan direction (the pan direction to be set) of the camera lens 6 is predefined, and the inner cover 3 is turned in the target direction so as to incline the dome cover 4 toward this target direction, thereby enlarging the inclination limit angle θ2 by the inclination angle θ1. For example, assuming that the angle θ1 at which the dome cover 4 is inclined (the inclination angle of the inclination support plane S4) is 15°, the tilt direction of the camera lens 6 can be set in the broader angular range (acceptable tilt setting range) from the vertical direction relative to the installation face S1)(0° to the enlarged inclination limit angle (90°=75° (θ2)+15° (θ1)). In this embodiment, the optical axis X of the camera lens 6 passes through the spherical center of the dome cover 4, so that it is possible to realize a camera image in high quality.
In this embodiment, the inner cover 3 and the dome cover 4 are combined on the inclination support plane S4, so as to have a substantially spherical appearance, thereby preventing inference of the direction of the camera lens 6 through the appearance of the dome camera 1.
This embodiment enables the inner cover 3 to have a function for securing a visual field of the camera lens 6 (function as the window 8), and a function for supporting the dome cover 4 (function as the inclined step portion 10). In this case, one component (inner cover 3) has the both functions, which reduces the number of components of the dome camera.
In this embodiment, when the inner cover 3 and the dome cover 4 are combined to each other, the combined portions (of the end 12 of the dome cover 4 and the inclined step portion 10 of the inner cover 3) have the same color tone, which prevents the difference in color tone at the combined portions. The dome camera 1 thus have a substantially spherical appearance, which prevents inference of the direction of the camera lens 6 through the appearance of the dome camera 1.
In this embodiment, when the inner cover 3 and the dome cover 4 are combined to each other, the end 12 in a dark color (such as black or gray, for example) of the dome cover 4 prevents the difference in color tone at the combined portions (the end 12 of the dome cover 4). The dome camera 1 thus have a substantially spherical appearance. Since the dome camera 1 has a substantially spherical appearance, it is possible to prevent inference of the direction of the camera lens 6 through the appearance of the dome camera 1.
In this embodiment, when the inner cover 3 and the dome cover 4 are combined to each other, the dome cover 4 to which the smoke treatment is applied prevents the internal structure from being visible through the dome cover 4, which hinders inference of the direction of the camera lens 6 through the appearance of the dome camera 1.
Description will now be provided on the dome camera according to the second embodiment of the present invention. Description will be provided mostly on the features of the dome camera of the second embodiment, which are different from those of the dome camera of the first embodiment. The configurations and the operations of this embodiment are the same as those of the first embodiment unless specifically mentioned.
As illustrated in
As shown in
In the example of
In the example of
In this embodiment, as illustrated in
Each locking projection 20 has a smaller thickness than that of the dome cover 4.
The dome camera 1 according to the second embodiment of the present invention can also attain the same effect as that of the first embodiment.
In addition, in this embodiment, each locking projection 20 at the end 12 of the dome cover 4 is inserted through each insertion hole of the inclined step portion 10 of the inner cover 3, and is engaged with each locked recess 21 of the inner cover 3, thereby readily fixing the dome cover 4 to the inner cover 3.
In this embodiment, as illustrated in
In the example of
In the example of
In this embodiment, each locking projection 20 at the end 12 of the dome cover 4 has a smaller (thinner) thickness than that of the dome cover 4, so that each locking projection 20 can have an appropriate flexibility. (The periphery of the locking hole 23 of) each locking projection 20 with an appropriate flexibility can easily moves beyond the respective inclined faces 25, 27, 28 of each locked protrusion 24 when the dome cover 4 is installed to the inner cover 3, and thus the dome cover 4 can readily be fixed to the inner cover 3.
In this embodiment, the alignment in height of the inner faces of the dome cover 4 and the inner cover 3 can prevent the camera lens 6 or the like from being caught by the inner face of the cover 5 (the inner cover 3 and the dome cover 4) even if the inner cover 3 is rotated with the dome cover 4 installed to the inner cover 3.
The embodiments of the present invention have been described using the aforementioned examples, but the scope of the present invention is not limited to them, and various modifications and alternations may be made within the scope set forth in the claims.
The preferred embodiments of the present invention that can be considered at the present time have been explained, but it should be appreciated that various modifications can be made on the embodiments of the present invention, and it is intended by the appended claims to cover all such modifications which fall within the true spirit and scope of the invention.
As described above, the dome camera according to the present invention attains effects to enable the setting of the tilt direction of the camera lens in a broader range, as well as realize a camera image in high quality, and is useful as a surveillance camera and the like.
Number | Date | Country | Kind |
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2010-143105 | Jun 2010 | JP | national |
This is a continuation of pending U.S. patent application Ser. No. 13/704,758, filed on Dec. 17, 2012, which is a National Stage of International Patent Application No. PCT/JP2011/003171, filed Jun. 6, 2011, which claims priority to Japanese Application No. 2010-143105, filed on Jun. 23, 2010, the disclosures of which are expressly incorporated by reference herein in their entireties.
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Number | Date | Country | |
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Parent | 13704758 | US | |
Child | 14261909 | US |