JP3352963B2 - TV camera heat dissipation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for radiating heat generated by a heating element mounted on a substrate built in a television camera.

[0002]

2. Description of the Related Art As a heat radiating device of a conventional television camera, particularly a professional handy television camera, for example, a heat sink is directly attached to a heating element (IC, transistor, etc.) attached to a substrate or via a metal heat transfer member. The heat sink 53 is fixed to an outer wall of a case member 52 which is fastened and the heat sink is directly fastened to the housing case of the camera body, or as shown in FIG. , The case 51 of the case member 52
There is a structure in which the inner wall of the case member 52 is pressed against the heating element 55 fixed on the substrate 54 by fastening to the heat sink 53 via the case member 52.

[0003]

However, in the former structure, a troublesome operation of disassembling the heat sink and peripheral parts is required at the time of maintenance of the board circuit. In the latter structure, if the mounting accuracy and processing accuracy of the case member are not increased, the adhesion between the heat sink and the heating element is lost, and the heat radiation efficiency is reduced. Furthermore, it is necessary to apply a certain pressure between the heating element and the case member in order to efficiently release the heat of the heating element, so that the heating element is pressed with a considerable force by the case member, but the heating element is fixed to the substrate. Therefore, it becomes a factor of causing the warpage of the substrate, and it is necessary to take measures for preventing the warpage of the substrate which causes the failure. For this reason, attempts have been made to mitigate the problem of adhesion and substrate warpage by sandwiching a thermally conductive rubber material between the heating element and the case member. In addition, since the thermal conductivity of the rubber material was lower than that of the metal material, the heat radiation efficiency could not be reduced.

Further, in any structure, there is a problem that the case member and the housing case connected to the heat sink become extremely high in temperature due to heat conduction due to metal contact, and are difficult to handle.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a heat radiating device which ensures good heat radiating performance and is excellent in maintainability.

[0006]

According to a first aspect of the present invention, there is provided a window for fastening a heat radiating member to a heating element mounted on a substrate built in a television camera and opening a heat radiating portion of the heat radiating member. A case member having an open portion is configured such that an outer edge portion is detachably fastened to a housing case of a camera body while a peripheral edge portion of the window portion is joined to the heat radiating member in a waterproof seal state. .

According to the first aspect of the present invention, the heat generating element is made of a metal or a heat radiating member having the same thermal conductivity as the heat generating element (in addition to the heat sink, the heat generating element and the heat sink are connected via the metal heat transmitting member). In this case, the heat transfer member is included), so that the close contact between the heat radiating member and the heating element can be ensured, so that good heat radiating efficiency can be ensured. The maintenance can be performed while fixing. further,
Since the case member is joined to the heat dissipating member in a waterproof seal state at the periphery of the window, the waterproof and dustproof functions can be ensured. For example, when the waterproof seal member is interposed at the joint, non-metallic contact is required. Due to the heat insulating effect, the temperature rise of the case member and the case connected thereto can be suppressed.
Even in the case of a simple waterproof seal structure in which the end of the case member is fitted into the groove formed around the heat radiating portion of the heat radiating member, the contact between the case member and the heat radiating member is limited only around the window. Since the contact area can be made sufficiently small, it is possible to suppress a rise in temperature of the case member and the case connected to the case member.

The invention according to claim 2 is characterized in that a cover having a ventilation hole is connected so as to cover the window of the case member.

According to the second aspect of the present invention, it is possible to avoid contact with the heat radiating portion by covering the window portion of the case member where the heat radiating portion of the heat radiating member, which becomes high in temperature by heat conduction from the heating element, is exposed. , Can prevent burns.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of a professional handy television camera provided with a heat radiating device according to the present invention, and a substrate is incorporated in a front part and a rear part of the camera in different forms, and is attached to each of these substrates. A heat radiating device for radiating heat generated from the heating element is provided.

First, the heat radiating device on the front side will be described. FIG. 2 shows the front surface of the substrate, and FIG.
FIG. 2 is a cross-sectional view taken along arrow A (parts and the like on the substrate are omitted). FIG.
3, a substrate 1 is attached to the inside of the front side of the camera in parallel with the side surface of the camera, and a heating element (IC, transistor, etc.) 2 fixed on the substrate 1 The heat sink 3 is brought into surface contact and fastened. Fins are arranged outside the heat sink 3 to form a heat radiating portion 3a. Window part 4a for opening the heat radiation part 3a
The outer edge portion of the front case member 4 having the opening is pressed against the peripheral groove 3b of the heat sink 3 via the hollow rubber packing (waterproof seal member) 5 while the outer edge portion of the front case member of the camera is pressed. 6 and fastened with screws while waterproof sealing with rubber packing 7. The front case member 4 is connected to a cover 8 having slits 8a as ventilation holes covering the heat radiating portion 3a of the heat sink 3 exposed from the window portion 4a of the front case member 4.

In this way, since the heat sink 3 is directly fastened to the heating element 2, adhesion to the heating element 2 is ensured, and the heat radiating portion 3 a comes into contact with the outside air through the slit 8 a of the cover 8. Thereby, good heat radiation efficiency can be secured. Further, maintenance can be performed while the heat sink 3 is fixed to the substrate 1 simply by removing the front case member 4. Further, the heat radiating portion 3a of the heat sink 3 exposed from the window 4a of the front case member 4 has a high temperature, but is covered with the cover 8, so that it is possible to prevent a burn due to contact with a human body. The front housing case 6 and the front case member 4 are formed of a metal material for the purpose of securing strength and shielding electromagnetic waves (the rear housing case 12 described later is also formed of a metal material for the same reason). It is sufficient that the cover 8 is formed of a resin material. By using a resin material having a low thermal conductivity, the surface sensible temperature of the surface can be reduced to such an extent that the cover 8 can be constantly in contact with the human body. Further, since the front case member 4 is press-bonded to the heat sink 3 via the hollow rubber packing 5, the waterproof and dustproof effect can be ensured. The temperature rise of the case member 4 and the front housing case 6 connected to the case member 4 can also be suppressed, and the surface temperature can be reduced to such an extent that a human body can come into contact. In addition, the force applied to the substrate 1 by compressing and deforming the hollow rubber packing 5 for waterproofing and dustproofing is the same as that when the heat sink fixed to the inner wall of the case member is pressed against the heating element in the latter conventional heat dissipation structure. Since it is sufficiently smaller than the force, the substrate 1 does not warp.

Next, the heat radiating device on the rear side will be described. 4 and 5 are cross-sectional views taken along the line BB in FIG.
Shows an exploded perspective view of the rear part of the camera. In the figure, there are three (only one is shown in the figure) inside the rear part of the camera.
The upper and lower ends of these substrates 11 are slidably fitted into rail grooves 12a formed on the upper and lower surfaces of the inner wall of the rear housing case 12 made of metal, and are pushed and pulled out. It has a slot structure that can be easily attached and detached for easy maintenance. A heating element (IC, transistor, etc.) 13 is fixed to a surface of the substrate 11 on the rear side of the camera. To conclude. The heat transfer member 14 has a side surface 14a bent parallel to the side surface of the camera.
The inner wall of the heat sink 15 made of metal, which is the main heat dissipating member, is fastened to the surface 14a by surface contact. On the outer wall of the heat sink 15, a heat radiating portion 15a in which fins are arranged is formed. As shown in FIG. 4 (b), the upper and lower flange portions of the heat sink 15 are sandwiched by a non-metallic heat insulating plate 21 so as to sandwich the rear housing case 12.
And fasten with screws. Due to the fastening structure sandwiching the heat insulating plate, heat conduction from the heat sink 15 to the rear housing case 12 is suppressed. A metal cover 16 is attached to the substrate 11 so as to cover the heat transfer member 14. Heat sink like this
The rear case member 17 is attached to the outside of each of the substrates 11 to which the substrates 15 are connected in a state where the substrates 11 are housed in the rear housing case 12. The rear case member 17 is provided with a heat radiating portion 15a of each heat sink 15.
Three windows 17a are opened, and a peripheral portion 17b formed to protrude inside the windows 17a is connected to a heat sink.
While being pressed against a peripheral groove 15b formed around the heat radiating portion 15a through a hollow rubber packing (waterproof seal member) 18,
The outer edge is waterproofly sealed to the rear housing case 12 with a rubber packing 19 and fastened with screws. The rear case member 17
Cover 20 in which slits 20a as ventilation holes are arranged so as to cover the heat radiating portion 15a of the heat sink 15 exposed from the window portion 17a.
Is connected to the rear case member 17.

In this way, the heat sink 15 is connected to the heating element 13 via the metal heat transfer member 14, which is a heat radiating member, similarly to the front heat radiating device, so that good heat radiating efficiency can be ensured. By simply removing the rear case member 17, the board 1 can be pulled out of the rear housing case 12 while the heat sink 15 is fixed to the board 1, and maintenance can be performed. Further, the heat radiating portion 15a of the heat sink 15 is covered with a cover 20.
It is possible to prevent burns from coming into contact with the human body because it is covered with the body. In addition, since the rear case member 17 is press-bonded to the heat sink 15 via the hollow rubber packing 18, the waterproof and dustproof effect can be secured. Similarly, the rise in temperature of the side case member 17 and the rear housing case 12 can be suppressed, and the surface temperature can be reduced to such an extent that a human body can always contact.

In the case of the substrate having the slot structure, a method has conventionally been adopted in which a heat sink is fixed to an outer wall of a case member of the camera, and the inner wall of the case member is pressed against a heating element on the substrate side by fastening the case member. But in that case,
Since the board is more likely to rattle than a non-slotted structure, the adhesion of the heat sink to the heating element is likely to be impaired. Although it was necessary to separately radiate heat to be separated, in the radiator according to the present invention, since the heat sink is connected to the substrate,
These problems can be solved.

Further, in the above-described embodiment, the case where ゛ joins the heat sink and the case member via a waterproof seal member (hollow rubber packing) is shown. However, as in the embodiment shown in FIG. The waterproof seal structure and the electromagnetic wave shield structure can be obtained even with a simple structure in which the peripheral end portion 32a of the case member 32 is fitted into the circumferential groove 31b formed around the heat radiating portion 31a of the heat sink 31. The contact between the case member 32 and the case member 32 is made only at the periphery of the window of the case member 32, and the contact area can be sufficiently reduced.
It is possible to suppress a rise in temperature of the housing 32 and the case connected thereto.

The radiator is not limited to metal as long as it has electromagnetic wave shielding, waterproofness, and heat conductivity. For example, the present invention can also be implemented by a ceramic radiator having a metal plated surface.

[Brief description of the drawings]

FIG. 1 is a side view of a professional handy television camera according to an embodiment of the present invention.

FIG. 2 is a diagram showing a substrate surface of a front portion of the camera.

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

4A is a cross-sectional view taken along line BB of FIG. 1, and FIG. 4B is an enlarged view of a portion B of FIG.

FIG. 5 is a perspective view of a cross section taken along line BB of FIG. 1;

FIG. 6 is an exploded perspective view of the rear portion of the camera in one direction.

FIG. 7 is an exploded perspective view of a rear portion of the camera from another direction.

FIG. 8 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 9 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Heating element 3 Heat sink 3a Heat radiating section 3b Peripheral groove 4 Front case member 5 Hollow rubber packing 6 Front housing case 8 Cover 8a Slit 11 Board 12 Rear housing case 13 Heating element 14 Heat transfer member 15 Heat sink 15a Heat radiating section 17 Rear case member 18 Hollow rubber packing 20 Cover 20a Slit 21 Insulation plate

Claims (2)

(57) [Claims] 1. A case member having a window for opening a heat radiating portion of a heat radiating member fastened to a heating element attached to a substrate incorporated in a television camera, and a peripheral portion of the window portion. Wherein the outer peripheral portion is detachably fastened to a housing case of the camera body while being bonded to the heat radiating member in a waterproof seal state. 2. The heat radiating device for a television camera according to claim 1, wherein a cover having a ventilation hole is connected so as to cover a window of said case member.