JPH11112923A - Optical disk camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat radiating characteristic, the vibration-proof and the anti-shock characteristic in the optical disk camera provided with an optical disk recorder. SOLUTION: As a configuration of an optical disk recorder built in a case 113 of the optical disk camera 112, an inner frame 106 made of an elastic material with high thermal conductivity and damping function is placed to a circumferential side face of a drive chassis 102 which incorporates an optical disk drive 101. The drive chassis 102 is built into the optical disk camera 112 via the inner frame 106. A heat generated in the optical disk drive 101 is delivered efficiently to the case 113 of the optical disk camera via the inner frame 106 and radiated. Furthermore, vibrations and shocks fed to the optical disk camera are buffered by the damping characteristic of the inner frame 106, before the shock and vibration are delivered to the optical disk drive 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk camera device using a phase change optical disk or a magneto-optical disk, and more particularly to an optical disk camera device in an optical disk recorder having improved vibration resistance, shock resistance and heat radiation.

[0002]

2. Description of the Related Art As shown in FIG. 5, an optical disk camera device is different from a conventional video camera device comprising a video tape recorder (VTR), a camera head 201 and a lens 202, in place of the VTR.
Is arranged. In this type of optical disk camera device, the vibration resistance and load resistance of the optical disk
Since a stricter condition than TR is required, conventionally, a configuration is adopted in which a drive chassis 204 containing an optical disk drive 208 is provided inside a sub-chassis 205 via a coil spring 206 and a damper 207. Here, the damper 207 is made of a solidified silicone gel, silicone rubber, or a composite thereof. Further, the optical disk drive 208 includes:
An optical disk rotation drive mechanism 209, an optical head 210, a linear drive mechanism 211 for moving the optical head 210 in the radial direction of the optical disk, an optical disk cassette loading system (not shown), and the like are incorporated. It is stored in the drive chassis 204.

Here, a vibration-resistant environment in the optical disk recorder will be described. Vibration characteristics include a focus direction, a tracking direction, and a disk tangential direction. Each axis is defined as X, Y, and Z axes. Here, the vibration resistance and shock resistance are improved in the X-axis direction based on the transmission characteristics of the optical disk. Will be described. Transmission characteristics 301 of optical disk
When the optical disk is rotated at 60 rps, a vibration spectrum having the harmonic as a main component is generated.
The spectrum of 0,180,240Hz stands. The transmission characteristics of the optical disk include those which are joined together and include 130 Hz which is the self-resonant frequency of the optical disk itself. By applying a focus servo to the vibration of the optical disk, the vibration of the optical disk is followed. Actuator transfer characteristics 302
Must basically have a gain greater than the transfer characteristic of the optical disk. The transfer characteristic of the optical disk is cleared by the transfer characteristic 303 obtained by multiplying the transfer characteristic of the actuator by a lag / read filter for applying focus servo.

[0004] With respect to the characteristics when there is no external vibration as described above, the vibration and shock resistance characteristics when external vibration is applied will be described below. When an impulse shock is applied as an external vibration, the vibration frequency characteristic is captured as a delta function, and becomes a flat frequency characteristic 304. When this vibration frequency characteristic is applied to the optical disk rotation system, the vibration is attenuated by the coil spring 206 and the damper 207, and the transmission characteristic 305 of the optical disk indicated by the broken line in the figure is obtained. The gain peak portion 308 is the primary resonance frequency of the sub-chassis supporting the optical disk drive. If this gain peak is large, the focus servo will be deviated if the transfer characteristic obtained by multiplying the basic transfer characteristic of the actuator by the lag / lead filter is suitable. As described above, in order to improve the anti-vibration and anti-shock characteristics, it is necessary to reduce the gain peak of the primary resonance frequency of the vibration system in the portion supporting the optical disk recorder and to have good temperature characteristics.

On the other hand, in the above-mentioned conventional optical disk camera device, the drive chassis 204 of the optical disk drive 208 is supported in the sub-chassis 205 by a coil spring 206 and a damper 207 with a space therebetween. Since the optical disk camera device is used for outdoor coverage, etc., the optical disk camera device is used in a sealed state so that rain, sand, and the like are not mixed into the camera device. In the sealed state, it is important how to efficiently radiate heat generated from the internal drive circuit or digital video signal processing circuit through the housing of the camera device 203. In order to satisfy this, it is necessary that the housing of the optical disk camera device itself functions as a radiator, and at the same time, the heat generated by the optical disk drive 208 be released to the housing of the camera device 203 through a device having good heat conduction. However, in the structure described above, heat propagates through the air and the coil spring 206 and escapes to the sub-chassis, resulting in poor heat transfer efficiency.

FIG. 7 shows a temperature rise 401 when the camera device is operated and a temperature characteristic 402 when the camera device is not operated. The temperature rise curve differs depending on the power consumption. Further, the temperature rise also differs depending on the temperature determination location of the camera device. In a sealed environment, the temperature rise above the camera device is large. In the case of an optical disk recorder, it is necessary to use the laser at a temperature of 60 ° C. or less, so it is necessary to suppress the temperature rise inside the apparatus as much as possible. In the figure, those having poor heat radiation characteristics are sequentially shown from above at 403, 404, 4
05.

[0007]

As described above, in the conventional optical disk camera device, since the drive chassis of the optical disk recorder is built in the sub-chassis via the coil spring and the damper, an air layer is formed around the drive chassis. And there is a problem that the heat radiation characteristic from the optical disk recorder is low. In addition, when the vibration of the internal optical disc recorder is sufficiently attenuated from the external vibration and shock resistance, the gain peak of the primary resonance frequency cannot be reduced sufficiently, and the vibration and shock resistance characteristics are not sufficient. .

It is an object of the present invention to provide an optical disk camera device which has improved vibration and shock resistance characteristics and also has improved heat radiation characteristics to reduce a rise in temperature inside the camera device.

[0009]

SUMMARY OF THE INVENTION The present invention provides an optical disk recorder of an optical disk camera device, a drive chassis having a built-in optical disk drive, and an elastic member having high thermal conductivity in which the drive chassis is housed in a housing of the optical disk camera device. And an inner frame made of a material. In this case, around the inner frame, a sub-chassis having a radiation fin fitted to a fin provided on the inner frame is fitted, and the sub-chassis is provided in a housing of the optical disc camera device. It may be configured to be housed in a storage unit. The inner frame is made of a synthetic material of a gel material and silicone rubber.
The inner frame is obtained by mixing silica, alumina, or silicon carbide having good thermal conductivity into a gel material, or the inner frame is obtained by mixing metal powder having good ripening conductivity into a gel material. Be composed.

It is preferable that a radiating portion projecting in a branch shape is integrally formed on an outer portion of the drive chassis, and the inner frame is formed so as to surround the radiating portion. Alternatively, it is preferable that a bellows-like damping portion is integrally formed on the outer surface of the inner frame.

An inner frame made of an elastic material having a high thermal conductivity and having a damping function is provided on a peripheral side surface of a drive chassis having a built-in optical disk drive, and the drive chassis is mounted inside the optical disk camera device via the inner frame. The heat generated by the optical disk drive is efficiently transmitted to the housing of the optical disk camera device via the inner frame and is radiated. In addition, due to the damping characteristic of the inner frame, vibration and impact applied to the optical disk camera device are buffered.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of the first embodiment of the present invention. The drive chassis 102 containing the optical disk drive 101 is made of lightweight aluminum or the like having good heat radiation characteristics. The optical disk drive 101 includes an optical disk drive mechanism 103, an optical head 10
4. The drive includes a linear mechanism 105 for moving the optical head 104 in the radial direction of the optical disk, a write amplifier for driving a semiconductor laser of the optical head, a drive circuit for an objective lens actuator for the optical head 104, and the like. It is installed inside the chassis 102.
These driving mechanisms are, for example, 3600 rpm (60 rpm).
In the case of high-speed driving exceeding s), power consumption reaches 3 W or more. In the case of a sealed state like an optical disk camera device, it is important to suppress the temperature rise to 10 ° C. or less. If the temperature is suppressed to 10 ° C. or less, the upper limit of the driving temperature of the laser is up to 80 ° C. Therefore, if a margin of 5 ° C. is taken, the operating environment temperature up to 45 ° C. can be set.

The optical disk drive 101 built in the drive chassis 102 is surrounded by an inner frame 106 made of silicone gel having good heat radiation characteristics and low thermal resistance, and a frame is provided outside the inner frame 106 via the inner frame 106. Sub-chassis 107 is fitted. The inner frame 106 is formed as a frame closely attached to the peripheral side surface of the drive chassis 102, and rectangular block portions 108 are integrally formed at four corners thereof. 109 are formed integrally. A slit 110 is formed on the outer surface of the block portion 108 in a vertical direction along the circumferential direction of the frame, and the slit portion 110 allows the block portion 108 to move in the width direction of the optical disk camera device, that is, in the X-axis direction shown in the drawing. , Which serves to attenuate vibrations and shocks in the X-axis direction. Further, the fins 109 provided on each side are connected to the sub-chassis 10 fitted outside thereof.
7 are fitted to the radiation fins 111 provided on each side of the inner surface of the radiator 7.

The sub-chassis 107 containing the drive chassis 102 and the inner frame 106 is
Camera device housing 11 of the optical disk camera device 112
3 is internally supported by an optical disk recorder storage section 114 provided in the optical disk recorder 3. A camera head 115 and a lens 116 are incorporated in the camera housing 113. Also, on the upper surface of the camera device housing 113, FIG.
A plurality of external radiating fins 117 are provided along the front-rear direction of the camera device so as to show a cross section taken along the line AA in FIG. It has the role of efficiently radiating heat to the outside air. In this embodiment, the sub-chassis 107 is provided as described above in consideration of ease of assembly and maintenance. However, in order to further reduce the weight, the sub-chassis 107 is removed.
A radiating fin may be provided directly on the inner surface of the storage section 114 of the camera housing 113 so as to be fitted to the fin 109 of the inner frame 106.

According to this optical distor camera device, heat generated in the optical disk drive 101 is transmitted from the peripheral surface of the drive chassis 102 to the inner frame 106, and is transmitted through the entire area of the inner frame 106 to the sub chassis 1.
07 and further radiated through the camera device housing 113. Here, regarding the heat radiation from the heating element, if the thermal resistance value β, the distance from the heating element to the radiating element is t, and the area from the heating element to the radiating element is S, the following relational expression of the thermal resistance R is established. . R = β · t / S (1) Further, assuming that the temperature rise of the heat radiator is T with respect to the power consumption of the heat radiator, the following equation is satisfied. R = δT / δW (2) To improve the heat radiation characteristics,
It is important to reduce the thermal resistance R. For this purpose, a material having a large surface area from the heating element to the heat radiating element, a small thickness, and a small thermal resistance ratio is required. Therefore,
In this embodiment, an inner frame body 106 made of a silicone gel using a material having a good thermal conductivity such as silica or alumina is used as a compound around a drive chassis 102 around a gel material having a small thermal resistance ratio. Since it is used, the thermal resistance R can be reduced,
Heat dissipation is improved.

Further, since the elastic inner frame 106 is interposed so as to surround the optical disc drive 101, the inner frame 106 is elastically deformed in each side of the inner frame 106 in the Y and Z directions in FIG. Vibration and shock resistance are improved, and the four corner block 108 slits 110
This improves vibration and shock resistance in the X direction. Thereby, in the transfer characteristic of the optical disk shown in FIG. 6, the gain peak of the primary resonance frequency by the inner frame body 106 that supports the optical disk drive 101 by damping can be suppressed to 1 dB or less, and a stable damping characteristic can be obtained. It is possible.

FIG. 3A is a perspective view of a second embodiment showing a modification of the drive chassis and the inner frame. Note that parts equivalent to those in the first embodiment are denoted by the same reference numerals. Here, at the four corners of the drive chassis 102, a radiator 118 protruding in a radial direction like a tree branch is provided, and the radiator 118 is included in the inner frame 106. 3B, a slit 119 is formed in the heat radiating body 118, and the slit 119 is formed in the inner frame 1
Slit 1 provided in block 108 at four corners of 06
10 are provided along the periphery. According to this configuration, since the heat of the drive chassis 102 is transmitted to the inner frame body 106 through the plurality of branches of the radiator 118, the heat radiation from the optical disk drive 101 can be more efficiently radiated. Become.

FIG. 4 is a perspective view showing a modification of the drive chassis and the inner frame according to the third embodiment of the present invention. In this embodiment, the block portions 108 at the four corners of the drive chassis 102 and the projections 12
0, and the inner frame 106 is configured to surround these projections. In this case, the protrusions 120 arranged at the four corners are formed in an umbrella shape at the tip. Also,
A heat transfer portion 121 having a bellows shape is formed at an intermediate portion of each side of the inner frame body 106 so as to project outward. The heat transfer portion 121 has an increased surface area and is easily elastically deformed in the Y and X directions, respectively. Have been. Further, the block unit 1
08 has a cut groove 122 formed at its base to facilitate elastic deformation in the Y and Z directions. In this configuration, the protrusion 120 allows the heat of the drive chassis 102 to be more efficiently transmitted from the inner frame body 106 to the sub-chassis 107 or the camera device housing 113, thereby increasing the heat radiation effect. Further, the damping effect of the bellows-like heat transfer section 121 satisfies vibration conditions such as holding on each side of the inner frame body 106 and reducing the gain peak of the primary resonance frequency, thereby reducing vibration resistance and shock resistance. It becomes possible.

Here, as the inner frame in the present invention, an insulating material obtained by mixing powder of silica, alumina and silicon carbide having good thermal conductivity into a gel material is used. In the case of conductive materials,
A gel material mixed with a metal powder having good thermal conductivity is used.

[0020]

As described above, according to the present invention, an inner frame made of an elastic material having high heat conductivity and having a damping function is provided on the peripheral side surface of a drive chassis containing an optical disk drive. Since the optical disk drive is housed in the optical disk camera device through the body, the heat generated in the optical disk drive is efficiently transmitted to the housing of the optical disk camera device via the inner frame and is radiated. In addition, due to the damping characteristic of the inner frame, vibration and impact applied to the optical disk camera device are buffered. As a result, it is possible to secure the anti-vibration and anti-shock characteristics of the optical disk camera device, effectively radiate the heat generated by the optical disk drive, and suppress the temperature rise inside the camera device.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a main part of a second embodiment of the present invention and a sectional view taken along the line BB of FIG.

FIG. 4 is a perspective view of a main part of a third embodiment of the present invention.

FIG. 5 is an exploded perspective view of a part of a conventional optical disk camera device.

FIG. 6 shows vibration resistance in a conventional optical disc camera device,
FIG. 4 is a transmission characteristic diagram for explaining impact resistance characteristics.

FIG. 7 is a temperature characteristic diagram in a conventional optical disk camera device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Optical disk drive 102 Drive chassis 106 Inner frame 107 Subchassis 108 Block part 109 Fin 110 Slit 111 Heat radiation fin 112 Optical disk camera device 113 Camera device housing 115 Camera head 116 Lens 117 External heat radiation fin 118 Heat radiator 120 Projection 121 Heat transfer Part 122 kerf

Claims (8)

[Claims] 1. An optical disk camera device in which an optical disk recorder and a camera head are integrated, wherein the optical disk recorder includes a drive chassis having a built-in optical disk drive, and a heat conductive member for housing the drive chassis inside a housing of the optical disk camera device. An optical disk camera device comprising: an inner frame body made of an elastic material having a high weight. 2. The optical disk drive has an optical disk, an optical head, and the like built in a drive chassis, the inner frame body is fitted closely to a peripheral surface of the drive chassis, and is provided on a housing of the optical disk camera device. The optical disk camera device according to claim 1, wherein the optical disk camera device is internally supported by the provided storage unit. 3. A sub-chassis having a radiation fin fitted to a fin provided on the inner frame is fitted around the inner frame, and the sub-chassis is attached to a housing of the optical disk camera device. The optical disk camera device according to claim 1, wherein the optical disk camera device is installed in a provided storage unit. 4. The optical disk camera device according to claim 1, wherein the inner frame is made of a synthetic material of a gel material and a silicone rubber. 5. The optical disk camera device according to claim 1, wherein the inner frame is formed by mixing silica, alumina, or silicon carbide having good thermal conductivity into a gel material. 6. The inner frame body is composed of a gel material mixed with a metal powder having good maturing conductivity.
4. The optical disk camera device according to any one of items 3 to 3. 7. A heat radiating portion protruding in a branch shape is integrally formed on an outer portion of the drive chassis, and the inner frame is formed so as to surround the heat radiating portion.
An optical disc camera device according to any one of the above. 8. A bellows-shaped damping portion is integrally formed on an outer surface of the inner frame.
An optical disc camera device according to any one of the above.