JP2011172055A - Television camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide television camera equipment for efficiently discharging heat generated in the electronic circuit device of a circuit board to the outside of a case body by radiation by fan convection and radiation by heat conduction, and thereby for suppressing the rise of temperature inside the case body. <P>SOLUTION: Radiator plates 2b, 3b are formed by using excellently heat-conductive and thin copper with a thickness of about 0.5 mm. Thin heat-conductive sheets 2c, 3c are attached onto the electronic circuit devices 2a, 3a in order to reduce a contact resistance between the radiator plates 2b, 3b and the electronic circuit devices 2a, 3a, and also pressure sponge pieces 2d, 3d are put between the radiator plates 2b, 3b and the circuit boards 3, 4. Thus, adhesiveness is improved by using the spring property of the thin radiator plates 2b, 3b. Besides, the radiator plates 2b, 3b are made thinner, and then radiation is promoted by reducing the resistance of an air flow to an intake port from the bottom and side surface lower parts of the case body 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a portable type television camera, and more particularly to a professional / broadcast grade handy type television camera.

It is common for commercial / broadcasting grade television cameras to require fairly high specs, which means that even handy-type television cameras are commercial / broadcasting grades. , No exception.
Moreover, in the case of this type of handy-type camera, the use environment is usually not limited to indoors and outdoors, and therefore it must be assumed to be used in hot weather.

Therefore, a problem at this time is that a large number of circuit boards that generate heat during operation exist in the television camera.
In particular, in the case of commercial / broadcasting grades, the required specifications are relatively high level, which complicates the items to be processed for image signals and the like on the camera side. A substrate is required, and as a result, the amount of heat generated on the circuit board is further increased. Therefore, heat dissipation is inevitable. In this case, it is necessary to consider the temperature environment under the above-mentioned hot weather.

FIG. 3 is an example of a handy type television camera provided with such a large number of circuit boards. In the prior art, a cross-sectional view taken along line AA in FIG. 3 in FIG. 4 and FIG. 3 in FIG. As shown in an enlarged sectional view taken along line AA of FIG. 6 and a sectional view taken along line BB of FIG. 4 in FIG. 6, a circuit board 1 called a mother board (MB) is provided with, for example, a DSP, A plurality of, for example, three circuit boards 2, 3, and 4 on which electronic circuit devices 2 a, 3 a, and 4 a such as FPGA are mounted are attached via a connector 5 so as to be stacked. The circuit boards 2 and 3 are combined with the heat sinks 20b and 30b, respectively, and are thermally coupled by interposing the heat dissipation sheets 20c and 30c at locations where the electronic circuit devices 2a and 3a of the circuit boards 2 and 3 are mounted. Yes. Further, a heat radiating sheet 4c is interposed at a place where the electronic circuit device 4a of the circuit board 4 is mounted, and is thermally coupled to a heat radiating fin 50a that forms a part of the casing 50 of the television camera.

Further, the heat radiating plates 20b and 30b are made of, for example, a plate material made of a material having excellent thermal conductivity such as aluminum and copper. Fastened with fixing screws 51 and 52.
Therefore, the heat generated in the electronic circuit devices 2a and 3a on the circuit boards 2 and 3 flows to the heat radiating plates 20b and 30b through the heat radiating sheets 20c and 30c, respectively, and then the housings via the heat radiating seats 6 and 7, respectively. 50.

On the other hand, the heat generated in the electronic circuit device 4a on the circuit board 4 flows into the heat radiating fins 50a through the heat radiating sheet 4c.
At this time, as shown in FIG. 3 and FIG. 6, a heat dissipation fan 60 is provided in the casing 50 of the television camera. The air taken in from the provided intake port 50 b passes between the heat radiation fins 50 a and the circuit boards 1, 2, 3, and 4, and then is discharged to the outside from the exhaust port 50 c provided in the lower part on the back side of the housing 50. It has become so.

Therefore, according to this prior art, since the heat radiation required to suppress the temperature rise of the electronic circuit devices 2a, 3a, 4a mounted on the circuit boards 2, 3, 4 within the range specified in the specification is provided, The normal operation of the John camera is guaranteed.
For example, the disclosure of Patent Document 1 can be cited as a related technology.

JP-A-11-355623

In the above prior art, the heat generated in the electronic circuit devices 2a and 3a of the circuit boards 2 and 3 flows to the heat radiating plates 20b and 30b via the heat radiating sheets 20c and 30c, respectively, and the housings via the heat radiating seats 6 and 7 respectively. Heat conduction to the body 50. However, the circuit board 2 and 3 and the circuit board 3 and 4 have a distance of about 8 mm between which the electronic circuit devices 2a and 3a are mounted. Since the heat radiation plates 20b and 30b are provided and heat is radiated to the side plate of the housing 50, the gap between the circuit boards 2, 3, and 4 is narrow, and the effect of convection heat radiation by the fan 60 is reduced. In addition, in order to conduct and dissipate heat, heat dissipating seats 6 and 7 for conducting heat to the side plate of the housing 50 are provided at the front and rear portions of the housing 50. Has a problem that the flow of convection heat radiation by the fan 60 is obstructed.
The object of the present invention is to efficiently discharge the heat generated in the electronic circuit device of the circuit board to the outside of the housing by heat dissipation by the convection of the fan and heat dissipation by heat conduction, and suppress the temperature rise in the housing. To provide a television camera.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 of the present invention includes a plurality of circuit boards that are provided so as to be stacked on the casing, including a heat sink thermally coupled to the casing. In a television camera that dissipates heat generated by the electronic circuit devices mounted on each case to the outside of the case by conducting heat to the case through the heat sink, the heat sink has a thin plate thickness. It is formed of a metal having good conductivity, and is mounted between the circuit boards, and is attached to the electronic circuit device via a heat conductive sheet. Further, an Osae sponge is provided between adjacent circuit boards. By providing, a television camera characterized by using the spring property of a thin heat sink to improve adhesion.

According to the present invention, the cooling capacity of the heat dissipating fins is improved and the temperature rise in the camera housing is suppressed, so that the camera performance can be sufficiently exhibited regardless of the use environment of the television camera.

It is sectional drawing by the AA line of FIG. 3 which shows one Embodiment of the television camera which concerns on this invention. It is an expanded sectional view by the AA line of FIG. 3 which shows one Embodiment of the television camera which concerns on this invention. It is a side view which shows an example of a handy type television camera. It is sectional drawing by the AA line of FIG. 3 which shows an example of the television camera by a prior art. It is an expanded sectional view by the AA line of FIG. 3 which shows an example of the television camera by a prior art. It is sectional drawing of the vertical direction in the BB line of FIG. 4 which shows an example of the television camera by a prior art.

Hereinafter, a television camera according to the present invention will be described in detail with reference to embodiments shown in the drawings.
1 and 2 show an embodiment of the present invention. FIG. 1 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 2 is an enlarged view of the same.

Here, first, also in this embodiment, a plurality of boards in which electronic circuit devices 2a, 3a, 4a such as DSPs and FPGAs are mounted on one circuit board 1 called a mother board (MB), for example, Three circuit boards 2, 3, and 4 are attached so as to be stacked via a connector 5. The circuit boards 2 and 3 are combined with the heat dissipation plates 2b and 3b, respectively, and are thermally coupled by interposing the heat dissipation sheets 2c and 3c at locations where the electronic circuit devices 2a and 3a of the circuit boards 2 and 3 are mounted. Yes.
Further, a point where the electronic circuit device 4a of the circuit board 4 is mounted is interposed with a heat radiating sheet 4c and is thermally coupled to the heat radiating fins 50a forming a part of the casing 50 of the television camera. These are the same as in the case of the prior art described in FIG. 4, FIG. 5 and FIG.

3 and 6, the television camera casing 50 is provided with a heat radiating fan 60. As indicated by the white arrows in FIGS. 3 and 6, the bottom of the casing 50 is provided. After the air taken in from the intake port 50b provided at the lower side of the side surface passes between the heat radiation fins 50a and the circuit boards 1, 2, 3, and 4, the exhaust port 50c provided at the lower rear side of the housing 50 The point of being discharged to the outside is also the same as in the case of the prior art described with reference to FIGS.

Here, in the embodiment of the present invention shown in FIGS. 1 and 2, as shown in the figure, the heat radiating plates 2 b and 3 b are fixed to the heat radiating seat 6 with fixing screws 51 in order to radiate heat to the housing 50. It is concluded with.
Accordingly, the heat generated in the electronic circuit devices 2a and 3a on the circuit boards 2 and 3 flows to the heat radiating plates 2b and 3b through the heat radiating sheets 2c and 3c, respectively, but thereafter, the housing 50 is connected only through the heat radiating seat 6. To flow into.
That is, for heat conduction from the heat radiating plates 2b and 3b to the housing 50 through the heat radiating seat, the heat radiating seat 6 is provided only in front of the housing 50 of the television camera, and the heat radiating seat 7 in the prior art is eliminated. This secures a gap and improves the flow of wind to the fan 60.
The heat dissipating seat 6 preferably has an integral structure with the housing 50, but the same effect can be obtained even if it is attached as a separate part.

Moreover, the heat sinks 2b and 3b are made of copper having a thin plate thickness of about 0.5 mm and good thermal conductivity (although aluminum can be used, the thermal conductivity is deteriorated by about 45%). Further, in order to reduce the contact resistance between the heat sinks 2b and 3b and the electronic circuit devices 2a and 3a, thin heat conductive sheets 2c and 3c are attached on the electronic circuit devices 2a and 3a, and the heat sinks 2b and 3b By inserting Osae sponges 2d and 3d between the circuit boards 3 and 4, not only is the spring property of the thin heat sinks 2b and 3b improved, but the heat sinks 2b and 3b are thinned. By doing so, it is possible to reduce the resistance of the airflow from the inlet port from the bottom and the lower side of the housing 50 and promote heat dissipation.

1: circuit board (motherboard), 2: circuit board, 2a: electronic circuit device, 2b: heat dissipation plate, 2c: heat dissipation sheet, 2d: osae sponge, 3: circuit board, 3a: electronic circuit device, 3b: heat dissipation plate, 3c: heat dissipation sheet, 3d: osae sponge, 4: circuit board, 4a: electronic circuit device, 4c: heat dissipation sheet, 5: connector, 6: heat dissipation seat, 7: heat dissipation seat, 20b: heat dissipation plate, 20c: heat dissipation sheet, 30b: heat radiating plate, 30c: heat radiating sheet, 50: housing, 50a: heat radiating fin, 50b: air inlet, 50c: air outlet, 51: fixing screw, 52: fixing screw, 60: fan.

Claims (1)

A heat sink thermally coupled to the inside of the housing is provided, and heat generated by the electronic circuit devices mounted on each of the plurality of circuit boards mounted so as to be stacked on the housing is transmitted to the housing via the heat sink. In a television camera that conducts heat and dissipates heat outside the housing,
The heat radiating plate is formed of a thin metal having good thermal conductivity, and is mounted between the circuit boards and attached to the electronic circuit device via a heat conductive sheet. A television camera characterized in that, by providing an osae sponge between matching circuit boards, the spring property of a thin heat sink is used to improve adhesion.

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