JP4713072B2 - Surveillance camera device - Google Patents

Description

  The present invention relates to a monitoring camera device, and more particularly to a monitoring camera device provided with a light projecting unit that is attached to a ceiling and whose imaging direction is movable from vertical to horizontal and that projects light according to the imaging range of the camera.

In a conventional surveillance camera device, for example, in Patent Document 1, a pair of substrates are provided on the left and right sides of a camera lens so as to be rotatable in the direction of the optical axis, and a plurality of light projecting means are arranged on each substrate. The light projection range is widened by rotating the substrate. Further, in Patent Document 2, in a dome-type surveillance camera device that captures a light projection range of a light projecting unit, a dome-shaped cover that covers the light projecting unit and the camera is attached to and detached from a base fixed to a ceiling or a wall. It can be freely mounted and provided with uneven texture on the surface of the cover, so that the projected light is diffusely reflected to widen the light projection range.
JP 2001-94846 A (summary figure A, B) Japanese Patent Laying-Open No. 2003-8954 (FIG. 4)

  In general, in a surveillance camera in which the imaging direction is movable from vertical to horizontal, a relatively short distance such as a floor is imaged on the vertical side, and a relatively long distance is imaged on the horizontal side such as a facing wall or an extension of a passage. . Further, in order to prevent unevenness in the captured image, it is desirable to make the light projection intensity applied to the subject uniform regardless of the distance to the subject within the imaging range.

  On the other hand, the light projecting means of the camera device in Patent Document 1 diffuses light to the left and right toward the vertical side and can irradiate a wide range, but the light projecting intensity from the light projecting means is directed from the vertical side to the horizontal side. In the imaging direction in which the distance to the subject is mixed with a short distance and a long distance, there is a problem that unevenness occurs in the captured image. Further, the light projecting means of the camera device in Patent Document 2 diffuses light by uneven texture, but the light projecting intensity is constant from the vertical side to the horizontal side as in Patent Document 1, and the same problem as described above. was there.

  Further, in order to solve the above problems with the conventional structure, a method of providing a light projecting means having a light projecting intensity corresponding to the imaging distance on the vertical and horizontal sides is conceivable, but there is a problem that the entire apparatus is enlarged. . Although a method of changing the light projection intensity of the light projecting means by adjusting the current according to the movement from the vertical side to the horizontal side is conceivable, there is a problem that the control method is complicated.

  The present invention has been made to solve the above-described problems, solves the above problems with a configuration that is almost the same as the conventional one, can vary the light projection intensity according to the imaging direction of the camera, and within the imaging range. It is an object of the present invention to obtain a monitoring camera device in which unevenness does not occur in a picked-up image by making the light projection intensity applied to a subject uniform even when the distance of the subject is mixed with a long distance and a short distance.

A monitoring camera device according to the present invention includes a monitoring camera that is rotatably supported from a vertical direction to a horizontal direction and changes an imaging range, and a light projecting unit that projects in the imaging direction following the imaging direction of the monitoring camera. The light projecting means includes a plurality of light sources arranged substantially evenly on the periphery of the lens of the surveillance camera, and the light source located on the horizontal side among the plurality of light sources is horizontal. is arranged to bias the side, it is obtained by more than the number of the vertical side of the light source the number of horizontal side of the light source of the imaging direction of the monitoring camera.

A monitoring camera device according to the present invention includes a monitoring camera that is rotatably supported from a vertical direction to a horizontal direction and changes an imaging range, and a light projecting unit that projects in the imaging direction following the imaging direction of the monitoring camera. The light projecting means includes a plurality of light sources arranged substantially evenly on the periphery of the lens of the surveillance camera, and the light source located on the horizontal side among the plurality of light sources is horizontal. Since the number of light sources on the horizontal direction in the imaging direction of the surveillance camera is larger than the number of light sources on the vertical side, the light projection intensity applied to the subject can be made substantially uniform. There is an effect that can be done.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of the surveillance camera apparatus shown in Embodiment 1 of the present invention, FIG. 2 is a detailed view of the light projecting means shown in FIG. 1, and FIG. 3 is an explanation of a light projection range by the light projecting means shown in FIG. FIG. In the figure, 1 is a base, 2 is a camera body, 3 is a camera substrate, 4 is a lens, 5 is a light projecting means, 6 is a movable part, 7 is a camera part, 8 is a clear dome, 9 is a dome mounting part, It is a surveillance camera device.

  In the figure, a base 1 and a camera body 2 are fixed to a ceiling (not shown), and exchange power, video and control signals with the outside. The camera substrate 3 is combined with the lens 4 to image the monitoring area. The light projecting means 5 arranges a plurality of light sources around the lens 4 to project the imaging range of the camera substrate 3. The movable part 6 supports the camera substrate 3 so as to be rotatable by approximately 90 ° from the vertical side to the horizontal side, and varies the imaging range.

  Further, the clear dome 8 is arranged so as to cover the movable part 6 and the camera part 7, and is transparent or translucent transparent hard so as not to interfere with the imaging of the camera part 7 and the light projection of the light projecting means 5. It is made of a synthetic resin material. The dome mounting portion 9 is integrated with the clear dome 8 and is fixed to the base 1 to protect the main body 2, the movable portion 6 and the camera portion 7 from external obstacles. With these configurations, the monitoring camera apparatus 10 can change the imaging range by approximately 90 ° from the vertical side to the horizontal side and project the imaging range by the light projecting means 5, so that it can be monitored even in a dark place such as at night. .

  Next, the configuration and operation of the light projecting means 5 will be described with reference to FIGS. As shown in FIG. 2, the light projecting unit 5 has light sources arranged substantially evenly on the periphery of the lens 4. Further, the a side indicates the horizontal side in the imaging direction of the monitoring camera device 10, and the b side indicates the vertical side, and the direction of the light source is uniformly directed from the center of the lens 4 to the outside. Further, the light source on the a side is biased to the horizontal side as a whole. In FIG. 3, L1-1 and L1-2 are the projection ranges of the light projecting means 5 when the imaging range of the camera is tilted by 70 ° from the vertical side, and L2-1 and L2-2 are the imaging ranges of the camera. The light projection range of the light projecting means 5 in the case of vertical (0 °) is shown.

  As shown in FIG. 3, when the imaging range of the camera is vertical, the imaging distance to the subject is considered to be constant. In this case, the light projecting unit 5 projects the imaging range evenly, and the light projection intensity applied to the subject is uniform within the projection range, so that the captured image is not uneven. Further, when the imaging range of the camera is tilted by 70 ° from the vertical side, the imaging distance to the subject is considered to be closer to the vertical side and further away from the horizontal side. On the other hand, since the light source of the light projecting means 5 is biased toward the a side, the light projection intensity is strong on the L1-1 side and becomes weaker toward the L1-2 side. For this reason, the light projection intensity applied to the subject is substantially uniform. As a result, even when the imaging range of the camera is tilted by 70 ° from the vertical side, the light projection intensity applied to the subject becomes substantially uniform, so that a uniform image can be captured.

  Further, since the light projecting means 5 is composed of a plurality of light sources, the light projecting intensity can be finely adjusted according to the imaging distance from the subject. Further, for example, there may be a case where the ceiling position where the monitoring camera device 10 is attached is high and the distance to the horizontal wall is short. Needless to say, if the angle of the light source of the light projecting means 5 is adjusted in consideration of the imaging distance from the subject, the light intensity can be adjusted more finely.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. 4 is an exploded perspective view of the surveillance camera apparatus shown in Embodiment 2 of the present invention, FIG. 5 is a detailed view of the cover shown in FIG. 4, and the same reference numerals as in FIGS. 1 to 3 denote the same or equivalent functions. Description is omitted. In the figure, 5a is a light projecting means, 11 is a cover, and 11a and 11b are embossed portions. The light projecting means 5a arranges a plurality of light sources substantially evenly on the periphery of the lens 4, and the direction of the light sources is only directed uniformly from the center of the lens 4 to the outside. Different from the light projecting means 5 biased to the side.

  Next, the configuration of the cover 11 will be described. The cover 11 is a transparent synthetic resin attached to the front surface of the light projecting means 5a, and is provided with fine concave and convex embossed portions 11a and 11b continuously. Further, the embossed portion 11b has a function of deeply reflecting the light from the light projecting means 5a more deeply than the embossed portion 11a. Further, the embossed portion 11 a is provided on the horizontal side of the cover 11, and the embossed portion 11 b is provided on the vertical side of the cover 11. Further, the depths of the embossed portions 11a and 11b are continuously increased toward the vertical side.

  Thereby, when the light projecting means 5a is directed to the vertical (0 °) shown in FIG. 3, the light is irregularly reflected by the embossed portion 11a, and the light projecting intensity becomes uniform with respect to the imaging range. Thereby, since the light projection intensity applied to the subject is uniform within the light projection range, there is no unevenness in the captured image. In addition, when the imaging range of the camera is tilted by 70 ° from the vertical side as shown in FIG. 3, the imaging distance to the subject is considered to be closer to the vertical side and further away toward the horizontal side. However, in this case, irregular reflection also occurs in the embossed portion 11a, but the horizontal side is shallower than the vertical side and the degree of irregular reflection is small. For this reason, the light projection intensity continuously increases from the vertical side to the horizontal side, and the light projection intensity applied to the subject is uniform within the light projection range, so that there is no unevenness in the captured image.

  In the configuration of FIG. 4, by adjusting the depth of the embossed portions 11a and 11b, it is possible to project a subject entering the imaging range with a uniform light intensity over all the movable positions of the camera. It has the effect that the subject can be imaged with the same illuminance. Further, for example, there may be a case where the ceiling position to which the monitoring camera 10 is attached is high and the distance to the horizontal wall is short. In such a case, if the depth of the embossed portions 11a and 11b is adjusted according to the imaging distance to the subject, it is possible to project the subject with a uniform light projection intensity.

  Furthermore, in the second embodiment, since the light source of the light projecting means 5a is not biased compared to the first embodiment, there is no problem even if the movable range of the camera is set to 90 ° to −90 °. Further, since the light projecting means 5a is composed of a plurality of light sources, the light projection intensity can be finely adjusted according to the imaging distance from the subject. Further, the cover 11 is newly provided to provide the embossed portions 11a and 11b, but the same effect can be obtained even if the embossed portions 11a and 11b are provided on the clear dome 8. Furthermore, it goes without saying that not only the above-described method but also various methods can be considered as a method of adjusting the light projection intensity to the distance to the subject within the imaging range using the embossed portions 11a and 11b.

  It can be used for surveillance cameras.

It is a disassembled perspective view of the surveillance camera apparatus shown in Embodiment 1 of this invention. FIG. 2 is a detailed view of light projecting means shown in FIG. 1. It is explanatory drawing of the light projection range by the light projection means shown in FIG. It is a disassembled perspective view of the surveillance camera apparatus shown in Embodiment 2 of this invention. It is detail drawing of the cover shown in FIG.

Explanation of symbols

1 base, 2 camera body, 3 camera board,
4 lens, 5 light projecting means, 6 movable part,
7 Camera part, 8 Clear dome, 9 Dome mounting part,
DESCRIPTION OF SYMBOLS 10 Surveillance camera apparatus 11 Cover, 11a Uneven part 11b Uneven part

Claims (1)

In a monitoring camera device comprising a monitoring camera that is supported rotatably from a vertical direction to a horizontal direction and changes an imaging range, and a light projecting unit that projects in the imaging direction following the imaging direction of the monitoring camera,
The light projecting means has a plurality of light sources arranged substantially evenly on the periphery of the lens of the surveillance camera, and among the plurality of light sources, the light source located on the horizontal direction side is arranged to be biased to the horizontal side. by which, the surveillance camera surveillance camera apparatus characterized by being greater than the number the number of vertical side of the light source of the imaging direction of the light source in the horizontal direction of the.

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