JP2003348394A - Ccd video camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify an assembly process, to improve positioning accuracy of a CCD relative to a lens focal point and further, to efficiently dissipate heat generated by the CCD to the outside of a camera main body in a video camera using the CCD as a photodetector. <P>SOLUTION: A CCD 1 is packaged on a wiring board 2, a heat absorption case 4 including a main body of the CCD is arranged and further, the heat absorption case and an exterior panel 5 are integrated to conduct heat. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CCD video camera suitable for commercial or industrial use, and more particularly to a built-in CCD (Charge Couple).
The present invention relates to a heat dissipation structure for preventing thermal damage of the ed device.

[0002]

2. Description of the Related Art Generally, a so-called surveillance camera is installed on a production line of a commercial facility such as a store or a bank, an industrial facility such as a factory, or a public facility such as a subway or an arcade for the purpose of safety management. During operation, it is operated continuously.

[0003] Surveillance cameras installed in such facilities have been demanded to be as small as possible so as not to be annoying for reasons such as giving a sense of incompatibility to facility users. Therefore, a video camera using a CCD, which is a semiconductor charge-coupled device, has been developed, and its miniaturization has been promoted and has been widely used.

However, in order to realize the miniaturization, it is indispensable to miniaturize each component and to increase the mounting density, which means that the temperature inside the camera body becomes relatively high. In a CCD video camera having a high temperature inside the camera body, the temperature of the CCD naturally rises. Further, as the number of pixels of the CCD increases and the driving frequency increases, the heat generation of the CCD itself also increases.

[0005] By the way, it is known that a dark current flows as an inherent characteristic of a CCD without an output current becoming zero even without light input, and this dark current depends on temperature. Then, when the temperature rises and this dark current increases, the dynamic range of the signal decreases, so that the noise increases and the S / N ratio of the image pickup signal decreases, and the image quality deteriorates.

Therefore, there is a method of forcibly cooling the CCD by incorporating an exhaust fan in the main body. In this case, however, there is a high probability that dust will accumulate in the main body and cause a failure. Outdoor installation is not preferred. In addition, there are many problems such as the noise generated by the exhaust fan, which limits the installation place, and furthermore, hinders the downsizing of the exhaust fan.

In order to solve such a problem, there has been proposed a method of fixing a heat radiating plate to a CCD as a means of natural heat radiation. As shown in FIG. 4, a wiring board 103 provided in a camera body 101 having a lens barrel 102 has C
The CD 104 is fixed by soldering with its lead pins 104a. As shown in FIG.
In fixing the 104 to the wiring board 103, the CCD 1
A heat radiating plate 105 made of metal is arranged on the back of the cover 04 and is fixed together with the cover panel 106 on the front with screws 107.

With this configuration, the heat sink 1
The heat radiation of the CCD 104 is prevented by the heat radiation plate 105, and the heat radiation plate 105 prevents the CCD 104 from being warped. However, the number of components increases and the number of steps for processing the CCD 104 increases.
Further, since the CCD 104 is attached with a gap formed between the back surface thereof and the wiring board 103, high positional accuracy with respect to the lens focal point cannot be obtained. The heat sink 1
Since the heat radiation by 05 is performed inside the camera body, it becomes a factor of increasing the internal temperature.

On the other hand, the configuration shown in FIG.
The CCD 104 is fixed integrally with the heat sink 107,
The cover panel 108 is fixed by screws 109. Since the CCD 104 is integrated with the wiring board 103, the positional accuracy with respect to the lens focal point can be made accurate. However, since the heat of the heat sink 107 is transmitted to the wiring board 103 and the temperature rises,
3 may be warped and the position of the CCD 104 may be displaced from the focal point of the lens. Also in the case of this configuration, since the heat is radiated by the heat radiating plate 107 inside the camera body, it becomes a factor of increasing the internal temperature.

[0010]

As described above, in the case of the above-described conventional configuration using natural heat radiation, since the heat radiation from the CCD is entirely performed within the camera body, the cooling efficiency of the CCD is extremely low, and the positional accuracy with respect to the lens focal point is low. Therefore, a reliable CCD video camera could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional CCD video camera, and facilitates the assembling work without increasing the number of processing steps. An object of the present invention is to provide a structure having a high heat radiation efficiency so as to increase the positional accuracy with respect to the focal point and efficiently radiate the heat generated by the CCD outside the camera body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described in detail.

FIG. 1 is an exploded perspective view showing the structure of a main part of the present invention, and FIG. 2 is a transverse sectional view of the same. In the figure, reference numeral 1 denotes a CCD, and its lead pins 1a extend from the through holes formed in the wiring board 2 to the rear surface of the wiring board and are fixed by soldering. Various electronic components other than the CCD 1 are mounted on the wiring board 2, and processing of image signals obtained by the CCD 1 is performed.

Reference numeral 4 denotes a heat-absorbing case, the main body of which is formed in a hollow shape that encloses the CCD 1, and a through-hole 4 a corresponding to the through-hole 2 b of the wiring board 2 is formed on a side portion. I have. The bottom surface of the heat absorbing case 4 is open, and a circular convex portion 4b is formed on the surface. A window 4c for exposing the exposed portion of the CCD 1 is opened at the center of the circular convex portion 4b. It is preferable that the heat absorbing case 4 is integrally formed by die-casting with a material having a high thermal conductivity.
And the heat generated by the CCD is effectively transmitted.

Reference numeral 5 denotes an exterior panel arranged on the front surface of the camera body, which is formed by die-casting into a shape shown in the figure, that is, a shape having a recess 5a in the center. The heat absorbing case 4 is provided in the recess 5a.
A window hole 5b that follows the outer shape of the circular convex portion 4b is opened,
On both sides of the window hole, a through hole 5c corresponding to the screw through hole 4a of the heat absorbing case 4 is formed. In addition, the exterior panel 5
Screw receiving bosses 5d are formed at four inner corners of the wiring board 2 so as to correspond to the screw through holes 2a at the four corners of the wiring board 2. On the other hand, a thread groove 5e is formed on the inner peripheral side wall of the concave portion 5a of the exterior panel 5, and an end of the lens barrel 6 is screwed into the thread groove 5e and fixed.

The main part of the present invention is configured as described above. When assembling the CCD, first, the CCD 1 is loaded into the hollow interior of the heat absorbing case 4 and then assembled to the wiring board. In this state, screw 3 is inserted into screw hole 4 of heat-absorbing case 4.
a, and the wiring board 2 and the heat absorbing case 4 are integrated as shown in FIG. Thereby, the CCD 1 is connected to the heat absorbing case 4.
The lead pins 1a are fixed to the wiring board 2 by soldering together with other electronic components.

Next, the circular convex portion 4b of the heat absorbing case 4 is inserted into the window hole 5b of the outer panel 5, and a screw 8 is inserted through the through hole 5c of the outer panel 5 to be screwed into the screw hole 4a of the heat absorbing case 4. And fix it. As a result, the CCD 1 is positioned on the exterior panel 5 via the heat absorbing case 4,
At the same time, the heat absorbing case 4 and the exterior panel 5 are in a state of being electrically conducted. Then, the four corners of the wiring board 2 are fixed to the screw receiving bosses 5d of the exterior panel 5 with screws 7, and finally, the lens barrel 6 is screwed into the screw groove 5e of the exterior panel 5 and mounted, thereby completing the assembly. . Then, by incorporating the open end of the exterior panel 5 into the camera body 10, the CC
It can be completed as a D video camera.

When the main part is constructed in this way, the CCD 1 fixed to the wiring board 2 is placed in a precisely fixed position, so that the image transmitted through the lens group 9 can be accurately transferred to the CCD 1. It is possible to form an image on the surface. Further, since the heat absorbing case 4 containing the CCD 1 and the outer panel 5 are in close contact with each other, the heat generated by the CCD 1 is transmitted to the outer panel 5 via the heat absorbing case 4 and is directly radiated from the outer panel 5 to the outside air. There is no heat stored in the camera body.

[0019]

As described above in detail, according to the present invention, the wiring board to which the CCD is fixed, the heat absorbing case and the exterior panel can be integrated in a single step, so that the assembling work is easy. And can be
The CCD can be accurately positioned with respect to the lens focus. Further, since the structural connection between the wiring board, the heat absorbing case, and the exterior panel becomes robust, the reliability can be improved without being affected by the warpage of the wiring board at all.

According to the present invention, since the heat generated by the CCD is directly radiated from the exterior panel to the outside air via the heat absorbing case, efficient heat radiation can be efficiently performed.
The heat generated by the CCD does not stay inside the camera body, the rise in the temperature of the CCD is suppressed, and a stable image can be obtained. In addition, by providing an exterior panel that enables a lens mount, the exterior panel has both a lens fixing function and a CCD heat radiation function, so that a simple structure can be achieved and manufacturing costs can be reduced. It has a great effect, for example.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a main part of the present invention.

FIG. 2 is a cross-sectional view of a configuration of a main part of the present invention.

FIG. 3 is a perspective view showing an assembled state of the present invention.

FIG. 4 is a perspective view showing an outline of a configuration of a CCD video camera.

FIG. 5 is a perspective view showing an example of a conventional CCD heat radiation structure.

FIG. 6 is a perspective view showing another example of a conventional CCD heat radiation structure.

[Explanation of symbols]

1 ... CCD 2 Wiring board 3 screws 4 ... heat absorbing case 5 Exterior panel 6 Lens barrel 7.8 screws 9 Lens group 10. Camera body

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/335 H01L 27/14 BF Term (Reference) 4M118 AA05 AA10 AB01 BA10 HA20 HA24 HA36 5C022 AA01 AB38 AB39 AC42 AC54 AC64 AC70 AC77 AC78 5C024 BX04 CY49 EX22 EX26 EX42 GX02 GY01

Claims (2)

[Claims] 1. A CCD mounted on a wiring board,
A CCD video camera, comprising: a heat absorbing case that encloses the main body of the CCD; and a heat absorbing case and an exterior panel integrated so as to conduct heat. 2. The CCD video camera according to claim 1, wherein the exterior panel is a lens mount panel.