JP2013143760A - Dome type monitoring camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a dome type monitoring camera compact.SOLUTION: A dome type monitoring camera comprising a dome cover, a lens unit which photographs a subject, a tilt turntable to which the lens unit is fixed and can tilt and rotate, a pan turntable which supports the tilt turntable in a tilt rotatable state, and can pan and rotate, a base section which supports the pan turntable in a pan rotatable state, and a case is characterized in that the tilt turntable and case have spherical parts having the same radius, and the spherical part of the tilt turntable and the spherical part of the case come into surface contact with each other to conduct heat.

Description

  The present invention relates to a surveillance camera that is installed in a building such as a store, a hotel, a bank, or a station and monitors a suspicious person or the like. More specifically, the present invention relates to a dome type surveillance camera that can be used by being installed on a ceiling or the like.

  Currently, surveillance cameras are used in various places such as stores, hotels, banks, and stations. A dome-type surveillance camera, which is an example of such a surveillance camera, has a rotation mechanism unit that can change the shooting direction inside, and takes an image by changing the direction of the shooting unit to the shooting direction desired by the user. be able to. These dome-type surveillance cameras are installed directly on the ceiling or embedded. Patent Document 1 discloses a heat dissipation method for a lens unit of a dome type surveillance camera.

JP-A-2001-78066

  However, the lens unit of the dome-type surveillance camera disclosed in Patent Document 1 described above cools the image sensor with a cooling fan. For this reason, a cooling fan and a circuit for operating the cooling fan are necessary, and the apparatus becomes large.

In order to achieve the above object, the dome type surveillance camera of the present invention comprises:
A dome cover,
A lens unit for photographing the subject;
A tilt turntable that fixes the lens unit and is capable of tilt rotation;
A pan turntable that supports the tilt turntable so as to be able to rotate the pan, and can rotate the pan.
A base portion that supports the pan turntable so as to be able to rotate the pan;
In a dome-type surveillance camera consisting of a housing,
The tilt turntable and the housing each have a spherical portion with the same radius,
The spherical surface portion of the tilt turntable and the spherical surface portion of the housing are in surface contact to conduct heat.

  According to the present invention, it is possible to reduce the size of the dome type surveillance camera.

The partial cross-sectional perspective view of the dome type surveillance camera in the Example of this invention The exploded view of the dome type surveillance camera in the example of the present invention Sectional drawing of the dome type surveillance camera in the Example of this invention Sectional view of a conventional dome-type surveillance camera

  In the following, a preferred embodiment of the present invention will be described with reference to the accompanying drawings and FIGS. FIG. 1 is a partial cross-sectional perspective view of a dome-type surveillance camera in an embodiment of the present invention. FIG. 2 is an exploded view of the dome type surveillance camera in the embodiment of the present invention. FIG. 3 is a sectional view of the dome type surveillance camera in the embodiment of the present invention.

  FIG. 4 is a cross-sectional view of a conventional dome type surveillance camera.

  The dome cover 12 is a transparent or translucent plastic cover member, and is formed in a hemispherical shape. The dome cover 12 is fixed to the upper case 13 with screws or the like (not shown).

  The housing of the camera includes an upper case 13, a lower case 14, a tripod screw hole 15, and the like. The upper case 13 is fixed to the lower case 14 with the dome cover 12 attached thereto. The lower case 14 is attached with the upper case 13 and further supports the electric substrate 51 and the base portion 41. A mounting structure for an installation portion (not shown) is provided on the bottom surface portion of the lower case 14. The tripod screw hole 15 is attached to the lower case 14. The dome-type surveillance camera 10 is installed on a ceiling or the like using a mounting structure provided on the bottom surface of the lower case or a tripod screw hole 15. The tripod screw hole 15 has a spherical portion.

  The lens unit 21 including the photographing optical system is covered with the dome cover 12 and photographs the outside (subject) from the inside of the dome-type monitoring camera 10. The lens unit 21 includes a lens barrel, a fixed lens fixed to the lens barrel, a movable lens that performs zoom adjustment and focus adjustment, a motor that moves the movable lens, and the like. These fixed lenses, movable lenses, motors, etc. are not shown. The heat generating part 26 is made of an image sensor, a substrate on which an image sensor, etc. are mounted. The heat generated in the heat generating portion 26 is conducted to the tilt turntable 24 through the heat radiating sheet 27. The lens cover 25 covers the front side of the lens unit 21 and makes it difficult to understand where the lens unit 21 is facing and where it is monitored as viewed from the outside of the camera.

  The video signal generated by the lens unit 21 and the heat generating unit 26 is transmitted to the electric board 51 via a cable (not shown). The electric board 51 processes the video signal generated from the lens unit 21 and the heat generating unit 26, and performs compression coding processing on the processed video signal. Then, the electric board 51 distributes the video signal subjected to the compression encoding process to an external camera control device via, for example, a network. In addition, although the electric board | substrate 51 in this embodiment is comprised with one board | substrate, it is not restricted to this. For example, the electric substrate 51 may be configured by two or more substrates.

  The tilt turntable 24 can fix the lens unit 21 and tilt and rotate about the axis T to change the shooting direction of the lens unit 21. The tilt turntable 24 is disposed inside the dome cover 12. The tilt turntable 24 has a spherical surface on its outer surface. The pan turntable 32 supports the tilt turntable 24 so as to be capable of tilt rotation about the axis T. The pan turntable 32 is attached to the base portion 41 so as to be capable of panning about the axis P. The base portion 41 supports the pan turntable 32 so as to be capable of panning about the axis P, and is fixed to the lower case 14 with screws (not shown).

  When the lens unit 21 faces the zenith portion direction of the dome cover 12, assuming that the tilt shooting direction is 0 degree, for example, the lens unit 21 is tilt-rotated in a range of 0 degree to 90 degrees, and -180 degrees to +180. Pan rotation in the range of degrees.

  The two spherical surfaces of the spherical part of the tilt turntable 24 and the spherical part of the tripod screw hole 15 have the same radius. Further, the two spherical surfaces of the spherical portion of the tilt turntable 24 and the spherical portion of the tripod screw hole 15 are centered on the intersection of the axis P and the axis T. The spherical surface portion of the tilt turntable 24 and the spherical surface portion of the tripod screw hole 15 are in surface contact and transfer heat by heat conduction. Since the spherical surface portion of the tilt turntable 24 and the spherical surface portion of the tripod screw hole 15 are centered on the intersection of the axis P and the axis T, the lens unit 21 is always in contact even if the photographing direction is changed. The heat transferred to the tripod screw hole 15 by heat conduction is radiated to the outside of the camera such as the ceiling where the camera is installed and the outside air. The tripod screw hole 15 and the tilt turntable 24 are made of a material having high thermal conductivity, for example, a metal such as aluminum. With the above configuration, heat can be effectively radiated and the surveillance camera can be downsized.

  FIG. 4 is a cross-sectional view of a conventional dome type surveillance camera 70. Heat generated by the heat generating portion 26 is transmitted to the tilt turntable 24 via the heat dissipation sheet 27. The heat transmitted to the tilt turntable 24 is transferred to the air around the tilt turntable 21. The air around the tilt turntable 24 is transferred to the upper case 13 and the lower case 14 by the convection of the air inside the camera and is radiated to the outside of the camera.

  Since the internal space of the camera is narrow, air convection does not occur sufficiently inside the camera, and the conventional dome-type surveillance camera has a low heat dissipation performance of the heat generating portion 26 composed of an image sensor or the like.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited only to this embodiment, A various deformation | transformation and change are possible within the range of the summary.

  For example, although the lower case 14 and the tripod screw hole 15 have been described as separate parts in the embodiments, the lower case 14 and the tripod screw hole 15 may be an integral part.

DESCRIPTION OF SYMBOLS 10 Dome type surveillance camera 12 Dome cover 13 Upper case 14 Lower case 15 Tripod screw hole 21 Lens unit 24 Tilt turntable 25 Lens cover 26 Heat generating part 27 Heat radiation sheet 32 Pan turntable 41 Base part 51 Electric board 70 Dome type monitoring camera 71 Tripod screw hole

Claims (5)

A dome cover,
A lens unit for photographing the subject;
A tilt turntable that fixes the lens unit and is capable of tilt rotation;
A pan turntable that supports the tilt turntable so as to be able to rotate the pan, and can rotate the pan.
A base portion that supports the pan turntable so as to be able to rotate the pan;
In a dome-type surveillance camera consisting of a housing,
The tilt turntable and the housing each have a spherical portion with the same radius,
A dome-type surveillance camera, wherein the spherical portion of the tilt turntable and the spherical portion of the housing are in surface contact and conduct heat. The dome type surveillance camera according to claim 1, wherein the spherical surface portion of the tilt turntable and the spherical surface portion of the housing are centered on an intersection of a pan rotation axis and a tilt rotation axis. The dome type surveillance camera according to claim 1, wherein the housing includes a screw hole portion for fixing the cover portion and the camera, and the screw hole portion has a spherical surface portion. The dome-type surveillance camera according to claim 1, wherein the tilt turntable and the housing are made of metal. The dome-type surveillance camera according to claim 3, wherein the tilt turntable and the screw hole are made of metal.