WO2013114986A1

WO2013114986A1 - Surveillance camera with dome cover attached thereto, and dome cover

Info

Publication number: WO2013114986A1
Application number: PCT/JP2013/051038
Authority: WO
Inventors: 西本　直樹; 三沢　充史
Original assignee: 富士フイルム株式会社
Priority date: 2012-01-31
Filing date: 2013-01-21
Publication date: 2013-08-08

Abstract

The present invention is capable of preventing deterioration in the optical performance of an imaging optical system that uses a dome cover, and makes it possible to inexpensively produce dome covers. A surveillance camera (10) for attachment to a ceiling or the like is covered by a dome cover body (140). The dome cover body (140) is attached to the surveillance camera (10) via a fixing ring (43) and a fixing screw (44). This dome cover body (140) is provided with a plurality of window units (openings (140a-140e), optical members (142a-142e)) which correspond to the multiple tilt angles of the surveillance camera (10). The optical members (142a-142e) are parallel plates, and are attached to the dome cover body (140) so as to be perpendicular to the lens optical axis (L) of the surveillance camera (10) when the camera is adjusted to each tilt angle. As a result, it is possible to prevent deterioration in the optical performance of an imaging optical system, and to inexpensively produce a dome cover that includes an optical member.

Description

Surveillance camera with dome cover and dome cover

The present invention relates to a surveillance camera with a dome cover and a dome cover, and more particularly to a technique for maintaining optical performance regardless of the tilt angle of the surveillance camera.

The hemispherical dome cover that covers the surveillance camera usually has a smoked color so that the internal surveillance camera is difficult to see, so that it does not give a sense of intimidation and does not break the atmosphere There is also a role to protect the surveillance camera from dust.

In recent years, with the increase in the number of pixels and resolution of surveillance cameras, there is a problem that the optical performance of the surveillance camera is degraded by the dome cover.

Conventionally, the inventions described in Patent Documents 1 and 2 have been proposed in order to solve this type of problem.

The dome camera described in Patent Document 1 is configured such that the thickness of the dome cover increases as the tilt (tilt angle) of the optical axis of the camera with respect to the dome apex direction increases. Thereby, the optical path length of the parallel light passing through the dome cover is made uniform, and the optical member is optically symmetrical with respect to the optical axis of the camera.

In addition, the dome type camera described in Patent Document 2 uses a dome cover in which the gradient of the refractive index of the dome cover decreases as the tilt angle of the optical axis of the camera with respect to the dome apex direction increases.

JP 2005-300659 A JP 2009-302943 A

As in the invention described in Patent Document 1, the dome cover whose thickness changes according to the tilt angle is difficult to manufacture, and particularly difficult to manufacture uniformly in the concentric direction, and is expensive. Become. Further, the optical path length of the parallel light passing through the dome cover is the shortest (thin) when the tilt angle is 0 degree, and becomes longer as the tilt angle increases. As a result, the focus position shifts according to the tilt angle. There is a problem.

In addition, as in the invention described in Patent Document 2, a dome cover whose refractive index changes according to the tilt angle is difficult to manufacture, and particularly difficult to manufacture uniformly in a concentric direction, and is expensive. It will be a thing. The optical path length of the parallel light passing through the dome cover varies depending on the angle of view (image height). However, in the invention described in Patent Document 2, the longer optical path length is set to have a higher refractive index than the shorter one. Therefore, there is a problem that the focus shift due to the angle of view is promoted and the aberration (longitudinal aberration) is increased.

The present invention has been made in view of such circumstances, and can prevent deterioration of the optical performance of the photographing optical system due to the dome cover, and can be manufactured at a low cost. The object is to provide a dome cover.

In order to achieve the above object, a surveillance camera with a dome cover according to one aspect of the present invention includes an imaging unit including a photographing lens, a base unit installed on a ceiling or a wall, and rotating with respect to the base unit A surveillance camera having a tilt angle fixing unit that fixes a tilt angle of a free imaging unit, and a dome cover body that covers the surveillance camera, wherein a plurality of openings according to the tilt angle of the imaging unit are formed And an optical member attached to each of the plurality of openings and having a shape corresponding to the angle of view of the imaging unit symmetrical to the optical axis of the photographic lens, and the dome cover body are rotatably held, One of the plurality of optical members includes a dome cover having a dome cover fixing portion that can be fixed at a rotational position facing the front surface of the imaging unit.

A plurality of openings corresponding to the tilt angle of the imaging unit are formed in the dome cover main body, and an optical member is separately attached to these openings, so that one optical member can be made smaller and the angle of view of the imaging unit Each optical member can be arranged so that the shape of the optical member corresponding to is symmetrical with respect to the optical axis of the photographing lens. Thereby, it is possible to prevent the optical performance of the photographing optical system from being deteriorated, and it is possible to manufacture a dome cover including the optical member at low cost.

In the surveillance camera with a dome cover according to another aspect of the present invention, the dome cover main body has a hemispherical shape, and the tilt rotation center of the imaging unit is more apex of the dome than the center of curvature of the spherical surface of the fixed dome cover main body. It is preferably located on the side. Thereby, it is possible to prevent vignetting even when the tilt angle is increased.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body are a plurality of long holes extending in the direction of the dome apex, and the entire tilt angle range is set. A plurality of long holes corresponding to each angle range divided into two or more, and the optical member attached to the plurality of long holes has a spherical shell shape with a constant thickness with the tilt rotation center of the imaging unit as the center of curvature. And it is preferable to arrange on a spherical surface with the center of curvature as the center of curvature.

The entire range of the tilt angle can be covered by the plurality of long holes and the optical member (window portion), and when the tilt angle of the imaging unit is determined, the window portion corresponding to the tilt angle is selected and selected. What is necessary is just to rotate and fix a dome cover so that a window part may come to the position which opposes an imaging part. In addition, each optical member is small compared to the dome cover and has a spherical shell shape with a constant thickness with the center of curvature of the tilt rotation center of the imaging unit as a center of curvature. Since it is arranged on a spherical surface with the tilt rotation center as the center of curvature, the optical performance of the photographing optical system does not change regardless of the tilt angle.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body are openings formed respectively corresponding to a plurality of adjustable tilt angles of the imaging unit, The optical member attached to the plurality of openings is an optical member having a constant thickness, and is preferably arranged so as to be symmetric with respect to the optical axis of the imaging lens of the imaging unit whose tilt angle is adjusted.

When the tilt angle of the imaging unit is determined to be one of a plurality of tilt angles, an opening and an optical member (window unit) corresponding to the tilt angle are selected, and the selected window unit is opposed to the imaging unit. When the dome cover is rotated and fixed so as to come to the position, the optical member of the window portion is arranged so as to be symmetric with respect to the optical axis of the photographing lens of the imaging portion. Thereby, the optical performance of the photographing optical system does not change regardless of which tilt angle (window) is selected.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the fixed-thickness optical member is an optical member of a parallel plate, and the optical axis of the imaging lens of the imaging unit whose tilt angle is adjusted. It is preferable to arrange them orthogonally. The parallel plate optical member can be manufactured at low cost and can have high optical performance.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the constant-thickness optical member has a spherical shell shape, and includes a tilt rotation center of the imaging unit and a curvature center of the spherical shell-shaped optical member. Are preferably arranged to match.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body are formed to be larger than a range corresponding to the angle of view of the imaging unit, and have a constant tilt angle. In this range, the aperture allows the tilt angle to be selected continuously. The optical member attached to the plurality of apertures is a parallel plate optical member, and is tilted so that the optical axis of the photographing lens is at the center of the aperture. It is preferable to be arranged so as to be orthogonal to the optical axis when adjusted to a corner.

Since the plurality of apertures are formed to be larger than the range corresponding to the angle of view of the imaging unit, the tilt angle can be further adjusted within the range of the selected aperture. The tilt angle can be continuously adjusted in the range of angles. Since the optical member attached to the aperture is a parallel plate, if the tilt angle is further adjusted within the range of the selected aperture, the parallel plate will not be orthogonal to the optical axis of the photographic lens. If the tilt angle adjusted within the range of the opening is small (for example, within ± 10 °), the optical performance of the photographing optical system can be prevented from being deteriorated.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body are formed to be larger than a range corresponding to the angle of view of the imaging unit, and have a constant tilt angle. The optical member attached to the plurality of openings has a constant-thick spherical shell shape with the center of curvature of the tilt rotation center of the imaging unit as the center of curvature. It is preferable that the lens is disposed on a spherical surface with the tilt rotation center as the center of curvature. The optical member has a spherical shell shape with a constant thickness centered on the tilt rotation center of the imaging unit, and is disposed on a spherical surface centered on the tilt rotation center. Even if the tilt angle is further adjusted within this range, the optical performance of the photographing optical system does not deteriorate.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body have the same shape and may be formed in a spiral shape from a position near the top of the dome. preferable.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the plurality of openings formed in the dome cover main body have the same shape, and have a first attachment portion for detachably attaching the optical member, The optical member has a second attachment portion attached to a first attachment portion of one selected opening of the plurality of openings of the dome cover body, and is not selected from the plurality of openings of the dome cover body. It is preferable that a lid having a third attachment portion is attached to the first attachment portion of the other opening. According to this, only one highly accurate optical member is prepared and attached to the opening corresponding to the selected tilt angle, and an inexpensive lid is attached to the other openings that are not selected, and the dome cover is made inexpensive. Can be produced.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the tilt angle fixing unit preferably includes a fixing member that stops or fixes the tilt angle of the imaging unit that can be continuously changed at an arbitrary position. . Thereby, the imaging unit can be adjusted and fixed to an arbitrary tilt angle.

In the surveillance camera with a dome cover according to still another aspect of the present invention, it is preferable to have a click mechanism that stops the imaging unit for each of a plurality of preset tilt angles. Thereby, it is possible to easily align the optical axis of the photographic lens whose tilt angle is adjusted (selected) and the opening and optical member (window) formed in the dome cover body corresponding to the tilt angle. it can.

In the surveillance camera with a dome cover according to still another aspect of the present invention, the first pedestal is rotatably arranged with respect to the base portion, and the optical axis of the imaging lens of the imaging unit is the dome of the dome cover. A first pedestal whose optical axis coincides with the direction of the apex and a rotation center that coincides with the first pedestal, and a second pedestal mounted rotatably with respect to the first pedestal and having an imaging unit attached thereto It is preferable to include a second pedestal having a tilt axis orthogonal to the rotation axis of the first pedestal, and a panning angle fixing unit that fixes the rotation angle of the first pedestal with respect to the base unit. . Thereby, the panning angle of the imaging unit can also be adjusted and fixed.

A dome cover according to still another aspect of the present invention is applied to the above-described surveillance camera with a dome cover.

According to the present invention, a plurality of openings corresponding to the tilt angle of the imaging unit are formed in the dome cover main body, and an optical member is separately attached to these openings, so that the optical member required for optical performance is reduced. And the optical member can be arranged so that the shape of the optical member corresponding to the angle of view of the imaging unit is symmetrical with respect to the optical axis of the photographing lens. Performance deterioration can be prevented, and a dome cover including an optical member can be manufactured at low cost.

The perspective view which shows 1st Embodiment of the surveillance camera with a dome cover which concerns on this invention. Sectional view of the main part of the surveillance camera with a dome cover shown in FIG. Sectional view of the main part of the surveillance camera shown in FIG. Top view of the dome cover body shown in FIG. The perspective view which shows 2nd Embodiment of the surveillance camera with a dome cover which concerns on this invention. Top view of the dome cover body shown in FIG. Cross-sectional view of the main part of the surveillance camera with a dome cover shown in FIG. Sectional drawing of the principal part of the surveillance camera shown in FIG. The principal part expanded sectional view of the surveillance camera shown in FIG. Side view of the surveillance camera including the second pedestal as seen from the direction of arrow A shown in FIG. Sectional drawing which shows 3rd Embodiment of the surveillance camera with a dome cover which concerns on this invention The top view of the dome cover main body shown in FIG. Sectional drawing which shows 4th Embodiment of the surveillance camera with a dome cover which concerns on this invention The top view of the dome cover main body shown in FIG. The top view of the dome cover main body of the surveillance camera with a dome cover of 5th Embodiment Sectional drawing of the principal part of the surveillance camera with a dome cover of 6th Embodiment

Embodiments of a surveillance camera with a dome cover and a dome cover according to the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a perspective view showing a first embodiment of a surveillance camera with a dome cover according to the present invention, FIG. 2 is a cross-sectional view of an essential part of the surveillance camera with a dome cover shown in FIG. 1, and FIG. FIG. 3 is a cross-sectional view of a main part of the surveillance camera shown in FIG.

As shown in these drawings, the surveillance camera 1-1 with a dome cover includes a surveillance camera 10 (FIGS. 2 and 3) and a dome cover 20 that covers the surveillance camera 10.

As shown in FIGS. 2 and 3, the monitoring camera 10 includes a base 12 that is mainly installed on a ceiling or a wall, and a first base 14 that is rotatably arranged with respect to the base 12. The second pedestal 16 is rotatably arranged with respect to the first pedestal 14, and the surveillance camera body (imaging unit) 18 is attached to the second pedestal.

As shown in FIG. 3, the surveillance camera body 18 has a photographing lens (focus lens 22 and variable magnification lens 24), an iris 26, an image sensor (not shown), and the like. This photographing lens is a varifocal lens, and the focus lens 22 and the variable power lens 24 can be independently moved in the direction along the lens optical axis L by rotating the corresponding operation ring. It is like that.

The angle of view (magnification) can be adjusted by moving the zoom lens 24 in the direction along the optical axis, and the focal point is formed on the image sensor by moving the focus lens 22 in the direction along the optical axis. The focal position can be adjusted to image. The surveillance camera 10 of this embodiment is used in a fixed state when a tilt angle, a panning angle, an angle of view, and a focus, which will be described later, are adjusted in accordance with a preset imaging region. Therefore, when the adjustment of the focal position and the angle of view is completed, it is preferable to fix the focus lens 22 and the variable magnification lens 24 with a fixing screw or the like so that the focus lens 22 and the variable magnification lens 24 do not move (the operation ring does not rotate).

In FIG. 2, 28 is an iris motor that drives the

iris

26, and 30 is an infrared cut filter drive unit that moves an infrared cut filter (not shown) in and out of the lens optical axis L. The surveillance camera 10 is not limited to this embodiment, and various cameras can be applied.

In FIG. 3, the rotation center of the first pedestal 14 coincides with the lens optical axis L when the surveillance camera body 18 (lens optical axis L) is in the downward direction on the paper (tilt angle is 0 °). Yes.

Further, the second pedestal 16 is rotatably arranged with respect to the first pedestal 14 by an axis (tilt axis) 32 orthogonal to the rotation center of the first pedestal 14. The surveillance camera 10 of this embodiment can take a range of 0 ° to 70 ° as a tilt angle.

Further, a panning angle fixing portion (wave plate spring 36, friction plate 38) is disposed between the base portion 12 and the first pedestal 14. The first pedestal 14 can be rotated by an external force larger than the frictional resistance of the friction plate 38, and can be stopped at an arbitrary rotation angle (panning angle) by the frictional resistance by the friction plate 38.

Similarly, a tilt angle fixing portion (friction plate 39) is disposed between the first pedestal 14 and the second pedestal 16. The second pedestal 16 can be rotated by an external force larger than the frictional resistance of the friction plate 39 and can be stopped at an arbitrary rotation angle (panning angle) by the frictional resistance by the friction plate 39. Note that the

friction plates

38 and 39 are not limited to those using the

friction plates

38 and 39, and may be fixed by tightening with screws after adjusting the tilt angle or the like.

As shown in FIGS. 1 and 2, the dome cover 20 includes a dome cover main body 40 in which mainly two

openings

40a and 40b are formed,

optical members

42a and 42b attached to these

openings

40a and 40b, respectively, and a dome. The dome cover fixing part (fixing ring 43, three fixing screws 44) for fixing the cover body 40 to the base part 12 is constituted.

The dome cover main body 40 has a hemispherical shape, and the dome cover main body 40 is fixed to the base 12 as shown in FIG. The tilt rotation center O ′ of the monitoring camera 10 is configured to be offset to the dome apex side. Accordingly, it is possible to prevent vignetting even when the tilt angle of the monitoring camera 10 is increased (that is, to increase the tilt angle). The dome cover main body 40 is preferably formed to be semi-transparent or opaque so as to be difficult to see the internal monitoring camera 10.

FIG. 4 is a plan view of the dome cover main body 40 shown in FIG.

As shown in FIG. 4, the two

openings

40a and 40b formed in the dome cover main body 40 have a shape of an elongated hole toward the dome apex direction, and the opening 40a has a tilt angle of 0 ° to 45 °. The opening 40b is a long hole formed corresponding to a tilt angle range of 45 ° to 65 °.

That is, the opening 40a is a minimum long hole that does not cause vignetting even when the angle of view of the monitoring camera body 18 is set to a wide angle and the tilt angle of the monitoring camera 10 changes in the range of 0 ° to 45 °. Similarly, the opening 40b is a minimum long hole that does not cause vignetting even when the tilt angle changes in the range of 45 ° to 65 °.

In the first embodiment, the

openings

40a and 40b are formed so as to be orthogonal to each other. However, the

openings

40a and 40b may be formed in a straight line as shown by a dotted line in FIG. You may make it do.

Optical members

42a and 42b are attached to the

openings

40a and 40b of the dome cover main body 40, respectively. Each of the

optical members

42a and 42b has a spherical shell shape having a constant thickness with the center of curvature O ′ of the surveillance camera 10 as the center of curvature, and is tilted so as to close the

openings

40a and 40b of the dome cover body 40. It arrange | positions so that it may be located on the spherical surface which makes rotation center O 'the center of curvature.

Note that the two window portions (the opening 40a and the optical member 42a, and the opening 40b and the optical member 42b) of the dome cover 20 are arranged in a positional relationship orthogonal to each other in this embodiment, but in FIG. , Shown in the same cross section.

The

optical members

42a and 42b are small compared to the dome cover main body 40 and have a spherical shell shape with a constant thickness with the tilt rotation center of the surveillance camera 10 as the center of curvature. it can. Further, since the

optical members

42a and 42b are arranged on a spherical surface with the center of curvature of the surveillance camera 10 as the center of curvature, the optical performance of the surveillance camera 10 should not be degraded regardless of the tilt angle. it can. The

optical members

42a and 42b are preferably formed to be semi-transparent with smoke so that the monitoring camera 10 is not easily visible, but may be formed to be colorless and transparent because they are smaller than the dome cover main body 40.

Next, the installation method of the surveillance camera 1-1 with a dome cover having the above configuration will be described.

First, the base 12 is fixed to the ceiling or wall. Subsequently, the panning angle and the tilt angle are adjusted and fixed so that the monitoring camera 10 faces the desired shooting direction. Next, the angle of view is adjusted by moving the zoom lens 24 of the monitoring camera 10 in the optical axis direction, and the focus position is adjusted by moving the focus lens 22 in the optical axis direction. At this time, it is preferable to perform focus adjustment by attaching a lens adapter having the same optical characteristics (for example, the same radius of curvature, thickness, and refractive index) as those of the

optical members

42a and 42b to the distal end of the monitoring camera 10. This is because when the surveillance camera 10 is covered by the dome cover 20, focus adjustment cannot be performed, and when the

optical member

42a or 42b is disposed in front of the surveillance camera 10, the focal position is shifted. is there.

Next, the surveillance camera 10 is covered with the dome cover main body 40, and the dome cover main body 40 is temporarily fixed to the base 12 with the fixing ring 43 and the three fixing screws 44. That is, the fixing screw 44 is loosened so that the dome cover main body 40 can rotate. At this time, a rubber ring 46 is interposed between the base 12 and the dome cover main body 40 to prevent the dome cover main body 40 from rattling and to obtain a dustproof effect.

Finally, the dome cover main body 40 is rotated so that the

optical member

42a or 42b corresponding to the tilt angle of the current monitoring camera 10 comes to the front of the monitoring camera 10, and then the fixing screw 44 is tightened to tighten the dome cover main body. 40 is fixed.

According to the surveillance camera 1-1 with the dome cover configured as described above, the

optical member

42a or 42b is monitored even if the tilt angle of the surveillance camera 10 is adjusted to any tilt angle within the range of 0 ° to 65 °. The

optical members

42a and 42b can be arranged on the front surface of the camera 10, and are arranged on a spherical surface with the tilt rotation center as the center of curvature, so that the angle of view of the monitoring camera 10 is maintained regardless of the tilt angle. The shape of the corresponding part is symmetric with respect to the lens optical axis L, and the influence on the optical performance can be reduced.

[Second Embodiment]
FIG. 5 is a perspective view showing a second embodiment of the surveillance camera with a dome cover according to the present invention, and FIG. 6 is a plan view of the dome cover main body shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the surveillance camera 1-1 with a dome cover of 1st Embodiment, and the detailed description is abbreviate | omitted.

As shown in FIGS. 5 and 6, the surveillance camera 1-2 with a dome cover according to the second embodiment is mainly different from the first embodiment in the configuration of the dome cover 120.

That is, the dome cover 120 includes a dome cover main body 140 in which mainly five openings 140a to 140e are formed, optical members 142a to 142e respectively attached to the openings 140a to 140e, and the dome cover main body 140. 12 and a dome cover fixing portion (fixing ring 43, three fixing screws 44).

As shown in FIG. 6, the five openings 140a to 140e formed in the dome cover main body 140 have the same shape (circular shape), and the five tilt angles (10 °, 35 °, 45 °, 55) of the surveillance camera 10. (°, 65 °). That is, each of the five openings 140a to 140e is located at a position facing the front surface of the monitoring camera 10 when the monitoring camera 10 is fixed at any one of the five tilt angles, and the image of the monitoring camera 10 is displayed. It is formed so as to have a minimum circular shape with no vignetting at the corners. Further, the five openings 140a to 140e are spirally arranged from a position near the dome apex of the dome cover main body 140. In FIG. 6, which is a plan view of the dome cover main body 140, the openings 140a to 140e are all shown in the same circle regardless of the arrangement position for convenience.

Optical members 142a to 142e are attached to the openings 140a to 140e of the dome cover main body 140, respectively. The optical members 142a to 142e are parallel flat plates having the same shape (circular shape).

FIG. 7 is a cross-sectional view of the main part of the surveillance camera 1-2 with a dome cover shown in FIG.

As shown in FIG. 7, the

optical members

142a, 142c, 142e are orthogonal to the lens optical axis L when the tilt angle of the surveillance camera 10 is adjusted to 10 °, 45 °, or 65 °, respectively. Are disposed in the

openings

140a, 140c, and 140e of the dome cover main body 140. As is clear from FIG. 6, the

optical members

142a, 142c, and 142e are not located on the same cross section, but are shown in the same cross section in FIG. 7 for convenience of explanation.

Similarly, the other

optical members

142b and 142d also have the

openings

140b and 140b of the dome cover main body 140 so as to be orthogonal to the lens optical axis L when the tilt angle of the surveillance camera 10 is adjusted to 35 ° or 55 °. 140d.

Since the optical members 142a to 142e are smaller than the dome cover main body 140 and are parallel flat plates, they are manufactured at a lower cost and with higher accuracy than the

optical members

42a and 42b applied to the first embodiment. be able to. The optical members 142a to 142e are adjusted when the surveillance camera 10 is adjusted to a preset tilt angle (10 °, 35 °, 45 °, 55 °, or 65 ° in the second embodiment), Since it is attached to the openings 140a to 140e of the dome cover main body 140 so as to be orthogonal to the lens optical axis L, the influence on the optical performance can be reduced regardless of the adjusted tilt angle.

Next, a mechanism for adjusting the tilt angle of the monitoring camera 10 to a preset tilt angle (10 °, 35 °, 45 °, 55 °, or 65 °) will be described.

FIG. 8 is a cross-sectional view of the main part of the surveillance camera shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the surveillance camera 10 of 1st Embodiment shown in FIG. 3, and the detailed description is abbreviate | omitted.

As shown in FIG. 8, in the surveillance camera 10 of the second embodiment, a click mechanism 50 (ball 52, coil spring 54, groove 56) is provided between the first pedestal 14 and the second pedestal 16. This is different from the monitoring camera 10 of the first embodiment.

FIG. 9 is an enlarged cross-sectional view of the main part of the surveillance camera shown in FIG.

As shown in FIG. 9, the first pedestal 14 in the vicinity of the tilt shaft 32 is provided with a ball 52 urged in the direction of the second pedestal 16 by a coil spring 54, while the second pedestal 14 A plurality of grooves (V grooves) 56 into which a part of the ball 52 falls are formed on the base 16 on the same radius from the tilt shaft 32.

FIG. 10 is a side view of the surveillance camera 10 including the second pedestal 16 as seen from the direction of the arrow A shown in FIG.

As shown in FIG. 10, five grooves 56 (grooves 56a to 56e) are formed on the same radius from the tilt rotation center O ′ of the surveillance camera 10 on the side surface of the second pedestal 16.

These grooves 56a to 56e are formed at positions where the angles formed with the lens optical axis L are 10 °, 35 °, 45 °, 55 °, and 65 °, respectively. On the other hand, the click ball 52 provided on the first pedestal 14 is provided at a position where the tilt angle of the surveillance camera 10 corresponds to 0 ° (see FIG. 9).

Therefore, when the surveillance camera 10 is rotated about the tilt axis 32, the click mechanism 50 is located at a position where the tilt angle of the surveillance camera 10 is 10 °, 35 °, 45 °, 55 °, or 65 °. A click operation is performed (the biased ball 52 falls into the groove 56), and the rotational resistance increases.

Thereby, the tilt angle of the monitoring camera 10 can be easily adjusted (selected) to any of 10 °, 35 °, 45 °, 55 °, or 65 °, and the monitoring camera can be adjusted with the adjusted tilt angle. 10 can be stopped (fixed).

Next, the installation method of the surveillance camera 1-2 with a dome cover having the above configuration will be described.

First, the base 12 is fixed to the ceiling or wall. Subsequently, the panning angle and the tilt angle are adjusted and fixed so that the monitoring camera 10 faces the desired shooting direction. At this time, the tilt angle of the surveillance camera 10 is adjusted to any of 10 °, 35 °, 45 °, 55 °, and 65 °.

Next, the angle of view is adjusted by moving the zoom lens 24 of the monitoring camera 10 in the direction along the optical axis, and the focus position is adjusted by moving the focus lens 22 in the direction along the optical axis. At this time, it is preferable to perform focus adjustment by attaching a lens adapter having the same optical characteristics as the optical members 142a to 142e (for example, a parallel plate having the same thickness and refractive index) to the distal end of the monitoring camera 10.

Next, the surveillance camera 10 is covered with the dome cover main body 140, and the dome cover main body 140 is temporarily fixed to the base portion 12 with the fixing ring 43 and the three fixing screws 44. Finally, the dome cover main body 140 is rotated so that the optical member corresponding to the current tilt angle of the monitoring camera 10 among the optical members 142a to 142e comes to the front of the monitoring camera 10, and then the fixing screw 44 is turned on. The dome cover main body 140 is fixed by tightening.

As shown in FIG. 6, the five optical members 142a to 142e are provided at positions corresponding to tilt angles of 10 °, 35 °, 45 °, 55 °, and 65 °, respectively. By appropriately rotating the main body 140, the optical member can be orthogonal to the optical axis of the lens of the surveillance camera 10 whose tilt angle is adjusted.

According to the surveillance camera 1-2 with the dome cover configured as described above, the tilt angle of the surveillance camera 10 is adjusted to any tilt angle of 10 °, 35 °, 45 °, 55 °, and 65 °. Any one of the optical members 142a to 142e can be arranged on the front surface of the monitoring camera 10, and can be arranged so as to be orthogonal to the optical axis of the monitoring camera 10, thereby reducing the influence on the optical performance. I can do it.

[Third Embodiment]
FIG. 11 is a cross-sectional view showing a third embodiment of the surveillance camera with a dome cover according to the present invention, and FIG. 12 is a plan view of the dome cover main body shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the surveillance camera 1-2 with a dome cover of 2nd Embodiment, and the detailed description is abbreviate | omitted.

As shown in FIGS. 11 and 12, the surveillance camera 1-3 with a dome cover according to the third embodiment is mainly different from the second embodiment in the configuration of the dome cover 220. In particular, as shown in FIG. The difference is that the number of windows (openings and optical members) provided in the cover main body 240 is larger than that in the second embodiment shown in FIG.

Further, as shown in FIG. 11, the relative size ratio between the surveillance camera body 18 and the dome cover body 240 is different from that of the second embodiment. In the third embodiment, the dome with respect to the surveillance camera body 18 is used. The size ratio of the cover main body 240 is larger than that in the second embodiment. Thereby, many window parts can be formed in the dome cover main body 240.

Further, the second pedestal to which the surveillance camera body 18 is fixed has an arm portion 216 having a predetermined length, and the surveillance camera body 18 is fixed to the tip of the arm portion 216. Thereby, the surveillance camera body 18 can be tilted along an arc (a dotted line in FIG. 11) having a size corresponding to the inner peripheral surface of the dome cover body 240.

On the other hand, the dome cover 220 mainly includes a dome cover main body 240 in which 29 openings 240-1 to 240-29 are formed, and optical members 242-1 to 242-1 attached to these openings 240-1 to 240-29, respectively. 242-29 and a dome cover fixing portion (fixing ring 43, three fixing screws 44) for fixing the dome cover main body 240 to the base portion 12.

As shown in FIG. 12, the 29 openings 240-1 to 240-29 formed in the dome cover main body 240 have the same shape (circular shape), and the tilt angle (5 °, 15 °) of the surveillance camera 10 is 29. , 19 °,..., 68 °, 70 °). That is, the openings 240-1 to 240-29 of 29 are respectively positioned at positions facing the front surface of the monitoring camera 10 when the monitoring camera 10 is fixed at any one of the 29 tilt angles. The angle of view of the camera 10 is formed to be a minimum circle that does not cause vignetting. The 29 openings 240-1 to 240-29 are arranged in a spiral from the position near the dome apex of the dome cover main body 240. In FIG. 12, which is a plan view of the dome cover main body 240, for the sake of convenience, the openings 240-1 to 240-29 are all shown in the same circle regardless of the arrangement position.

Optical members 242-1 to 242-29 are attached to the openings 240-1 to 240-29 of the dome cover main body 240, respectively. The optical members 242-1 to 242-29 are parallel flat plates having the same shape (circular shape). Further, the optical members 242-1 to 242-29 are arranged such that the lens optical axis L when the tilt angle of the surveillance camera 10 is adjusted to 5 °, 15 °, 19 °,..., 68 °, or 70 °, respectively. Are arranged in the openings 240-1 to 240-29 of the dome cover main body 240 so as to be orthogonal to each other.

FIG. 11 shows a window (opening 240-1, optical member 242-1) corresponding to a tilt angle of 5 °, and the optical member 242-1 adjusts the tilt angle of the surveillance camera 10 to 5 °. When this is done, the dome cover body 240 is disposed in the opening 240-1 so as to be orthogonal to the lens optical axis L.

Since the optical members 242-1 to 242-29 are smaller than the dome cover main body 240 and are parallel flat plates, they can be manufactured at low cost and with high accuracy. In addition, the optical members 242-1 to 242-29 are arranged such that the surveillance camera 10 has a preset tilt angle (5 °, 15 °, 19 °,..., 68 °, or 70 ° in the third embodiment). Since the lens is attached to the openings 240-1 to 240-29 of the dome cover main body 240 so as to be orthogonal to the lens optical axis L, the optical characteristics of the surveillance camera 10 are adjusted regardless of the adjusted tilt angle. The performance can be prevented from deteriorating. In the third embodiment, since the number of windows is larger than that in the second embodiment, the tilt angle can be set more finely.

[Fourth Embodiment]
FIG. 13 is a sectional view showing a fourth embodiment of the surveillance camera with a dome cover according to the present invention, and FIG. 14 is a plan view of the dome cover main body shown in FIG. In addition, the same code | symbol is attached | subjected to the part which is common in the surveillance camera 1-3 with a dome cover of 3rd Embodiment, and the detailed description is abbreviate | omitted.

As shown in FIGS. 13 and 14, the surveillance camera with a dome cover 1-4 according to the fourth embodiment is mainly different from the second and third embodiments in the configuration of the dome cover 320, and particularly shown in FIG. Thus, the number and size of windows (openings and optical members) provided in the dome cover main body 340 are different from those of the second and third embodiments shown in FIGS.

That is, the dome cover 320 mainly includes a dome cover main body 340 formed with six openings 340a to 340f, optical members 342a to 342f attached to the openings 340a to 340f, and the dome cover main body 340, respectively. It comprises a dome cover fixing part (fixing ring 43, three fixing screws 44) that is fixed to the part 12.

As shown in FIG. 14, the six openings 340a to 340f formed in the dome cover main body 340 have the same shape (circular shape), and the centers of the openings 340a to 340f are the six tilt angles ( 10 °, 37 °, 43 °, 53, 57 °, 63 °). That is, each of the six openings 340a to 340f is a position where the lens optical axis L of the monitoring camera 10 coincides with the center of the opening when the monitoring camera 10 is fixed at any one of the six tilt angles. In addition, the surveillance camera 10 is formed to have a minimum circular shape in which no vignetting occurs in the angle of view even if it changes within a range of ± 7 ° from the six tilt angles. The six openings 340a to 340f are spirally arranged from a position near the dome apex of the dome cover main body 340. In FIG. 14, which is a plan view of the dome cover main body 340, for convenience, the openings 340a to 340f are all shown in the same circle regardless of the arrangement position.

Optical members 342a to 342f are attached to the openings 340a to 340f of the dome cover main body 340, respectively. The optical members 342a to 342f are parallel flat plates having the same shape (circular shape). The optical members 342a to 342f are orthogonal to the lens optical axis L when the tilt angle of the surveillance camera 10 is adjusted to 10 °, 37 °, 43 °, 53, 57 °, or 63 °, respectively. The dome cover main body 340 is arranged in the openings 340a to 340f.

FIG. 13 shows a window (opening 340a, optical member 342a) corresponding to a tilt angle of 3 ° to 17 ° (10 ° ± 7 °). The optical member 342a has a tilt angle of the surveillance camera 10. When adjusted to 10 °, the dome cover main body 340 is disposed in the opening 340a so as to be orthogonal to the lens optical axis L.

Therefore, even if the surveillance camera 10 is adjusted within a range of ± 7 ° around the tilt angle of 10 °, no vignetting is caused by the opening 340a. Further, the optical performance of the lens optical axis L and the optical member 342a can be prevented from deteriorating with respect to the required optical performance by making the inclination within 7 ° with respect to the orthogonal direction.

Further, since the aperture of the window portion formed in the dome cover main body 34 is made larger than the lens diameter of the front surface of the photographing lens, a tilt of a certain angle (± 7 °) is possible in one window. In this embodiment, the tilt angle can be linearly selected in the range of 30 ° to 70 °.

[Fifth Embodiment]
FIG. 15 is a plan view of a dome cover body of a surveillance camera with a dome cover according to the fifth embodiment.

The surveillance camera with a dome cover according to the fifth embodiment is a modification of the second embodiment, and the configuration of the dome cover main body 140 ′ is different from that of the second embodiment.

As shown in FIG. 15, the dome cover main body 140 ′ has a window portion (opening opening 140a) corresponding to a tilt angle of 10 ° of the surveillance camera 10 as compared with the dome cover main body 140 of the second embodiment shown in FIG. The optical member 142a) is not provided.

When the direction of the optical axis of the lens of the surveillance camera is close to the dome apex of the dome cover main body 140 ′ having a constant spherical shell shape, it corresponds to the shooting angle of view of the dome cover main body with respect to the lens optical axis. The shape of the portion to be made becomes almost symmetrical, and the influence on the optical performance is very small.

Therefore, in the case of the dome cover main body 140 ′ of the fifth embodiment, no window is provided in a portion corresponding to a range where the tilt angle of the surveillance camera is small.

[Sixth Embodiment]
FIG. 16 is a cross-sectional view of an essential part of the surveillance camera with a dome cover according to the sixth embodiment, and shows another modification of the second embodiment shown in FIG.

As shown in FIG. 16, the surveillance camera 1-2 ′ with a dome cover according to the sixth embodiment is shown in FIG. 7 in that an optical member 142 and the like are detachably attached to the dome cover main body 140 ″. This is different from the surveillance camera 1-2 with a dome cover of the second embodiment.

As shown in FIG. 16, the five openings 142a ′ to 142e ′ formed in the dome cover main body 140 ″ are provided with screw portions (first attachment portions) for detachably attaching optical members and the like. ing.

On the other hand, one optical member 142 and four lids 143 to be attached to the screw portions of these five openings 142a 'to 142e' are separately prepared. The optical member 142 is provided with a screw portion (second attachment portion) that is screwed with the screw portions of the openings 142a ′ to 142e ′. The optical member 142 is one of the five openings 142a ′ to 142e ′. Can be attached to.

Similarly, the four lids 143 are provided with screw portions (third attachment portions) that are screwed with the screw portions of the openings 142a ′ to 142e ′, and the four lids 143 have five openings 142a ′ to 142a ′. The optical member 142 of 142e 'is attached to the opening where it is not attached.

That is, when any one of the five tilt angles is selected, the optical member 142 is attached to the opening corresponding to the selected tilt angle, and the lid 143 is attached to the other openings that are not selected. Thereby, the cheap lid | cover 143 can be used for the window which is not used.

Further, it is preferable to provide a mounting portion for attaching the optical member 142 at the tip of the lens barrel of the monitoring camera 10. According to this, the optical member 142 can be attached to the lens barrel during focus adjustment before the dome cover is attached, and can be attached to the opening corresponding to the tilt angle of the dome cover main body 140 ′ after the focus adjustment.

[Others]
In the second to sixth embodiments, a circular parallel flat plate is used as the optical member attached to the opening of the dome cover body. However, the present invention is not limited to this, and a spherical shell shape with a constant thickness is used. You may have. Particularly, in the case where the tilt angle can be adjusted linearly as in the fourth embodiment shown in FIG. 13, it is preferable that the center of curvature of the optical member coincides with the tilt rotation center O ′.

Further, it goes without saying that the number and shape of the window portions formed in the dome cover main body are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

1-1 to 1-4, 1-2 '... surveillance camera with dome cover, 10 ... surveillance camera, 20, 120, 220, 320 ... dome cover, 12 ... base, 14 ... first pedestal, 16 ... Second pedestal, 18 ... surveillance camera body, 22 ... focus lens, 24 ... variable power lens, 32 ... tilt axis, 40, 140, 140 ', 240, 340 ... dome cover body, 38, 39 ... friction plate, 40a , 40b, 140a to 140e, 140a 'to 140e', 240, 240-1 to 240-29, 340a to 340f ... opening, 42a, 42b, 142, 142a to 142e, 142a 'to 142e', 242, 242-1 242-29, 342a to 342f ... optical member, 43 ... fixing ring, 44 ... fixing screw, 50 ... click mechanism, 143 ... lid

Claims

A surveillance camera having an imaging unit including a photographing lens, a base unit installed on a ceiling or a wall, and a tilt angle fixing unit that fixes a tilt angle of the imaging unit that is rotatable with respect to the base unit; ,
A dome cover body covering the surveillance camera, the dome cover body having a plurality of openings according to the tilt angle of the imaging unit, and attached to each of the plurality of openings, corresponding to the angle of view of the imaging unit The shape of the portion to be held is an optical member having a symmetrical shape with respect to the optical axis of the photographic lens, and the dome cover main body is rotatably held. A dome cover having a dome cover fixing portion that can be fixed at a rotational position facing the front surface;
Surveillance camera with dome cover.
2. The dome cover body according to claim 1, wherein the dome cover body has a hemispherical shape, and a tilt rotation center of the imaging unit is located closer to a dome apex side than a curvature center of a spherical surface of the fixed dome cover body. Surveillance camera.
The plurality of openings formed in the dome cover body are a plurality of long holes extending in the direction of the top of the dome, and a plurality of long holes corresponding to each angle range obtained by dividing the entire tilt angle range into two or more. And
The optical member attached to the plurality of long holes has a spherical shell shape having a constant thickness with the tilt rotation center of the imaging unit as the center of curvature, and is on a spherical surface with the tilt rotation center as the center of curvature. The surveillance camera with a dome cover according to claim 2 disposed.
The plurality of openings formed in the dome cover main body are openings formed corresponding to a plurality of adjustable tilt angles of the imaging unit, and the optical member attached to the plurality of openings is fixed The surveillance camera with a dome cover according to claim 1 or 2, wherein the surveillance camera is a thick optical member, and is arranged so as to be symmetric with respect to an optical axis of a photographing lens of the imaging unit whose tilt angle is adjusted.
5. The optical member having a certain thickness is a parallel plate optical member, and is disposed so as to be orthogonal to an optical axis of a photographing lens of the imaging unit in which the tilt angle is adjusted. Surveillance camera with dome cover.
The optical member having a certain thickness has a spherical shell shape, and is arranged so that a tilt rotation center of the imaging unit and a curvature center of the spherical shell-shaped optical member coincide with each other. Surveillance camera with dome cover.
A plurality of openings formed in the dome cover main body are formed to be larger than a range corresponding to an angle of view of the imaging unit, and the tilt angle can be continuously selected within a certain tilt angle range. The optical member attached to the plurality of openings is a parallel plate optical member, and the light when the optical axis of the photographing lens is adjusted to a tilt angle so as to be in the center of the opening The surveillance camera with a dome cover according to claim 1, wherein the surveillance camera is disposed so as to be orthogonal to an axis.
A plurality of openings formed in the dome cover main body are formed to be larger than a range corresponding to an angle of view of the imaging unit, and the tilt angle can be continuously selected within a certain tilt angle range. The optical member attached to the plurality of openings has a spherical shell shape with a constant thickness centered on the tilt rotation center of the imaging unit, and the tilt rotation center is the center of curvature. The surveillance camera with a dome cover according to claim 2, wherein the surveillance camera is disposed on a spherical surface.
The plurality of openings formed in the dome cover main body have the same shape, and are formed in a spiral shape from a position in the vicinity of the dome apex. The monitor with a dome cover according to any one of claims 4 to 8. camera.
The plurality of openings formed in the dome cover main body have the same shape and a first mounting portion for detachably mounting the optical member,
The optical member has a second attachment portion attached to a first attachment portion of a selected one of the plurality of openings of the dome cover body,
The lid | cover which has a 3rd attachment part is respectively attached to the 1st attachment part of the said other opening which is not selected among several opening of the said dome cover main body. Surveillance camera with dome cover.
The monitoring with a dome cover according to claim 1, wherein the tilt angle fixing unit includes a fixing member that stops or fixes the tilt angle of the imaging unit that can be continuously changed at an arbitrary position. camera.
The surveillance camera with a dome cover according to any one of claims 4 to 6, wherein the tilt angle fixing unit includes a click mechanism that stops the imaging unit for each of a plurality of preset tilt angles.
A first pedestal disposed rotatably with respect to the base part, wherein the optical axis rotates when the optical axis of the imaging lens of the imaging unit coincides with the direction of the dome apex of the dome cover A first pedestal whose center coincides with the first pedestal, and a second pedestal that is rotatably arranged with respect to the first pedestal and to which the imaging unit is attached, wherein the rotation of the first pedestal 13. The apparatus according to claim 1, further comprising: a second pedestal having a tilt axis orthogonal to the axis; and a panning angle fixing portion that fixes a rotation angle of the first pedestal with respect to the base portion. The surveillance camera with a dome cover as described in the paragraph.
A dome cover applied to the surveillance camera with a dome cover according to any one of claims 1 to 13.