JPH05258526A - Optical disk device - Google Patents

Abstract

PURPOSE:To lengthen an MTBF(mean time between failure) of the optical disk device. CONSTITUTION:Operating heat of a laser diode and revolving speed control circuits 51 and 51' is radiated from an air hole 5 of a 2nd cover 14 positioned above a printed board 16 sealing a top panel above the laser diode of an optical pickup 21 and the revolving speed control circuits 51 and 51', and a front panel is sealed by a 1st lid 30 or a 2nd lid 31 and a 2nd front panel 12 while both right and left panels and a lower panel are sealed by a 2nd chassis 18. Then, an upper panel is sealed by the 2nd cover 14 and a film 15, while a rear panel is sealed by a partition wall 17, resulting in approximately hermetic closure of an optical pickup 21. By this method, since the optical pickup 21 is approximately hermetically sealed, dust is prevented, and by an radiation effect of the 2nd cover disposed above the surface of the printed board 16 that is above the pickup, heat inside the approximately hermetic closure is also radiated, obtaining an effect of radiation and dust proof at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device having a high-speed search function and an image processing function, and more particularly to improvement of a heat dissipation mechanism for electronic parts and a dustproof mechanism for optical parts used in the optical disk device.

[0002]

2. Description of the Related Art For example, an optical disk recording / reproducing apparatus is an apparatus for recording and reproducing high-density information on an optical disk which is an optical recording medium, capable of recording a large capacity of several megabytes, and easily replacing the recording medium. There is a feature that you can.

On the other hand, however, since it handles light, if dust in the air accumulates on the objective lens of the optical pickup due to long-term use, the laser beam output from the objective lens or the laser beam reflected and condensed by the objective lens. May be obstructed by dust, resulting in poor performance such as poor access, which shortens the life of the device.

In particular, since the built-in type optical disk apparatus has a limitation in the external dimensions of the apparatus, electronic elements such as a laser diode of an optical pickup and electronic parts such as a disk rotating motor are arranged in a narrow space. However, these electronic elements and electronic components generate heat when the disc is read, and the temperature inside the device becomes high, which shortens the life of the device.

Therefore, in the conventional optical disk device, as a dustproof means, a wall that defines a circulation path of the air is provided or an air filter is provided at the air intake port so that dust that enters with the air does not approach the optical pickup. I was doing it.

Devices related to this type of device are disclosed, for example, in JP-A-62-52785 and JP-A-62-29.
8074, Japanese Patent Laid-Open No. 63-293783, and Japanese Patent Laid-Open No. 64-52279.

As the heat radiating means, there is a device for air cooling by naturally or forcibly circulating air, and a device related to this type is, for example, JP-A-64-43888.

[0008]

In the above-mentioned prior art, although the dust-proof effect and the heat-dissipating effect have the contradictory properties that if one is improved, the other is deteriorated, only one effect is described. Since the balance of properties of each other was not taken into consideration, there is a problem that the life of the device is shortened in any case.Especially, the optical disc device equipped with the high-speed search function and the image processing function requires the balance between the dustproof function and the heat radiation function. Met.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide an optical disk device having a structure capable of significantly extending MTBF (mean failure interval) in consideration of the balance between the dustproof function and the heat radiation function. To provide.

[0010]

[Problems to be Solved by the Invention] The above problem is that a set of a drive unit mechanism including a disc insertion / ejection mechanism, an optical pickup, a motor, etc. is sealed at the front with a lid for opening / closing the disc insertion / ejection port and a front panel, and the bottom is , Both sides are sealed with a chassis, the rear side is sealed with a partition wall, the top surface is covered with a film between the cover and the gaps and holes of the chassis, and the image processing board and the power supply section are each separated by a wall or sealed. The problem is solved by an optical disk device arranged in a place different from the printed circuit board.

[0011]

In the above optical disk device, the optical pickup included in the set of the drive unit mechanism can be sealed substantially by the lid and the front panel, the chassis, the partition wall, the cover and the film, so that the dust accumulated on the objective lens can be prevented. The chassis and the cover can dissipate heat generated by electronic components and heat generated in the drive unit mechanism. Further, by disposing the image processing board apart from the printed circuit board, heat can be released independently without being affected by mutual heat generation.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view showing an external appearance including a partial cross-sectional view of an optical disk device according to an embodiment of the present invention.
3 is a schematic side view of a cross section taken along the line AA of FIG. 1, FIG. 1 shows a disc in a non-mounted state, and FIG. 3 shows a state in which the disc is mounted on a reproducing means.

In each drawing, reference numeral 1 denotes a stand-alone type (fixed type) optical disc device, 2 denotes a built-in type (built-in type) optical disc device, 3 denotes a first front panel, and 4 denotes a first type. Cover 5 is an air hole,
6 is a first chassis, 7 is an image processing unit, 8 is a first interface, 9 is a switching power supply, 10 is a blower, 1
Reference numeral 1 is a second interface, 12 is a second front panel, 13 is an insertion / ejection port of a cassette containing a disk,
Reference numeral 14 is a second cover, 15 is a film, 16 is a printed circuit board on which electronic parts such as a control unit of the built-in type optical disk device 2 are mounted, 17 is a partition wall, and 201 is a wall.

Reference numeral 18 is a second chassis, 19 is a turntable, 20 is a motor, 21 is an optical pickup, 22 is an optical pickup objective lens, 23 is an optical pickup drive unit, 24 is a rail, and 25 is a disc insertion / ejection. Mechanism, 26 is a stud, 27 is a lever, 28 is a rotation shaft of the lever, 29 is a cushion for vibration damping made of rubber and spring, 30 is a first lid, 30a is a rotation shaft of the first lid,
Reference numeral 31 is a second lid, 31a is a rotation axis of the second lid, 31b is a stud of the second lid, and 32 is a biasing force of the first lid 30 in the counterclockwise direction (arrow (a) direction in the figure). The first spring 33 is a counterclockwise direction (arrow (b) in the figure)
Direction 34 ), the second spring 34 is a turntable 19, a motor 20, and an optical pickup 2.
1, objective lens 22, optical pickup drive unit 2
3, a rail 24, a disc insertion / ejection mechanism 25, a stud 26, a lever 27, and a lever rotation shaft 28. Further, reference numeral 35 is a disk case having a built-in disk, and 36 is a disk.

In the stand-alone type optical disk device 1 composed of the above elements, the built-in type optical disk device 2 , the image processing board 7 and the switching power supply 9 which are the constituent elements are separated from each other and separated by a wall 201, or each is sealed. The set 34 of the drive units inside the built-in type optical disk device 2 is supported by the cushion 29 and installed on the second chassis 18, and the lower surface and the side surface are sealed by the second chassis 18, and the rear surface is Specially designed bulkhead 1
7. The top surface is sealed by the cover 14 and the film 15, and the front surface is sealed by the first lid 30 and the second front panel 12 as shown in FIG. When mounted on the turntable 19, the front surface is sealed by the second lid 31 and the second front panel 12 as shown in FIG.

The operation of the first lid 30 and the second lid 31 will be separately described later.

A printed circuit board 16 formed by sealing the top surface of the drive unit set 34 is covered with a second cover 14 having a sealing film 15, and the printed circuit board 16 is a built-in type. Controller, read / write circuit, etc. of the optical disc apparatus 2 (not shown)
An electronic element that generates heat during operation, a rotation speed control circuit (not shown) of the motor 20 in the optical pickup drive unit 23,
The optical pickup 21 has a laser diode (not shown).
Includes parts that generate heat during operation.

Next, the operation of the first lid 30 and the second lid 31 outlined above will be described with reference to FIGS. 1 and 3.

In FIG. 1, the first lid 30 is biased by the first spring 32 in the direction of arrow (a) to seal the cassette insertion / exhaust port 13, and the second lid 31 is closed by the second spring 33. Although it is biased in the direction of the arrow (B), it is locked to the stud 26 of the disc insertion / ejection mechanism 25 by the lever 27, and the position shown in the figure is maintained.

When the disc case 35 containing the disc 36 is inserted from the disc insertion / ejection port 13 from the state shown in FIG. 1, the first lid 30 rotates in the clockwise direction (the direction opposite to the arrow (a) in the figure), and When a certain amount of the case 35 is inserted, the rotation of the motor is activated and a set of gears (not shown) is used to move the case 35 in the horizontal direction, as indicated by the arrow (c) in the figure.
3 and then descends to mount the case 35 on the reproducing means, that is, the disc 36 on the turntable 19 to obtain the state of FIG. At this time, the stud 26 descends as the disc insertion / ejection mechanism descends, and when the lever 27 is rotated to lock the second lid 31, the spring force of the second spring 33 rotates the second lid 31. The disc insertion / exhaust port 13 is closed by rotating the shaft 28 about its axis.

As described above, in the result, the objective lens 22 and the optical parts (not shown) in the optical pickup 21 are not covered with the disk 36, and the first lid together with the set 34 of the drive unit mechanism. 30 and the second front panel 12, the second chassis 18, the partition wall 17, the second cover 14 and the film 15 are substantially sealed, and when the disc 36 is mounted on the turntable 19, the second It can be seen that the lid 31 and the second front panel 12, the second chassis 18, the partition wall 17, and the printed circuit board 16 are substantially sealed.

Next, the heat and dustproof action of the optical disk device having the above-mentioned structure in a practical use state will be described below including FIG.

FIG. 4 is a block diagram of constituent elements in the use state of the optical disk device. In FIG. 4, the same reference numerals as those used in FIG.
1, 51 'is a rotation speed control circuit, 53 is a read / write circuit, 54 is a positioning control circuit, 55 is a control circuit for a built-in type optical disk device, 56 is a buffer, 57 is a register, 58 is a main storage device, and 59 is Control unit of stand-alone type optical disk device, 60 is a display,
61 is a keyboard, 62 is a laser beam printer, 63
Is an optical disk device connected by a daisy chain, 64
Indicates a host computer.

When the case 35 containing the disk 36 is inserted from the disk insertion / ejection port 13 of the optical disk device 1 or 2 , the disk insertion / ejection mechanism 25 operates to automatically mount the disk 36 on the turntable 19 and the keyboard 61. The motor 20 is rotated by the operation of, and the pickup mounting mechanism 52 and the pickup drive unit 2 are rotated.
3, the optical pickup 21 is moved in the radial direction of the disk 36, and by the control of the positioning control circuit 54,
The optical pickup 21 is positioned at a designated track position on the disc 36, and data is read from the read / write circuit 53 to build in the type interface 11.
Data is transferred under the control of the built-in type control circuit 55, and the image data restored in the image processing unit 7 is transferred to the host computer 64 or output to the dedicated laser beam printer 62 under the control of the stand-alone type control unit 59. It becomes.

During this operation, the data on the disk 36 is read at a constant linear velocity of the disk 36, so that the disk 3
Since the rotation speed of the motor 20 must be changed every time the optical pickup 21 is moved in the radial direction on 6, the rotation speed control circuits 51 and 51 'generate heat due to an increase in control current and further increase the data search speed. Motor 20 for
Since the number of revolutions is increased to a multiple of 200 to 530 rpm, the amount of heat generated increases, and heat is generated by the output of the laser diode that generates the laser light of the optical pickup 21, and these heat rises and reaches the printed circuit board.

On the other hand, the printed circuit board 16 also includes the positioning control circuit 54, the read / write circuit 53, the built-in type control circuit 55, etc. and all or a part of the rotation speed control circuits 51, 51 ', and therefore generates heat.

These rotation speed control circuits 51, 5
The heat of 1 ', the optical pickup 21 and the printed circuit board 16 further rises and is radiated by the second cover 14 to be kept below the performance guarantee temperature of the electronic component used.

In the stand-alone type optical disc device 1 , the switching power supply 9 and the image processing unit 7 also generate heat in the above operating state, so that the built-in type optical disc device 2 and the wall 201 partition the first cover. Heat is radiated by the air holes 5 and the blower 10 provided in the No. 4 and kept below the guaranteed performance temperature.

Next, since the optical components such as the objective lens 22 provided in the optical pickup 21 rotate the disk 36 during operation at a plurality of times of the regular rotation speed of 200 to 530 rpm, the amount of dust invading together with the air is proportional. As a result, the laser light that is reflected and condensed is obstructed by long-term use, and poor performance such as poor access is more likely to occur. In order to prevent this, as described above, the optical pickup 21 works together with the drive unit mechanism 34 as shown in FIGS. 1 and 3 except when the disc is inserted and ejected, and the first and second lids 30 and 31, the second chassis 18, The partition 17, the second cover 14, and the film 15 are substantially sealed.

[0031]

According to the present invention, the heat of the electronic components such as the laser diode of the optical pickup, the rotation speed control circuit of the motor, etc. generated during the operation of the optical disk device is dissipated by the cubbar 14 provided on the upper part thereof, and the image is separately displayed. Processing unit,
The switching power supply is divided into walls, and heat is dissipated by a separately provided air hole and blower.At the same time, optical parts such as the objective lens of the optical pickup can be sealed with a lid, front panel, chassis, partition wall, cover, and film so that heat can be dissipated. And dust protection can be performed at the same time, and MTB of optical disk device
F (mean failure interval) can be significantly improved.

[Brief description of drawings]

1 is a schematic diagram of a cross-section along the line AA of FIG. 2 showing the features of the present invention.

FIG. 2 is a perspective view showing the appearance of the optical disk device of the present invention.

3 is a schematic cross-sectional view taken along the line AA in another state of FIG.

FIG. 4 is a block diagram showing an actual use state of the optical disc measure.

[Explanation of Codes] 1 ... Stand-alone type optical disc device, 2 ... Built-in type optical disc device, 3 ... First front panel, 4 ... First cover, 5 ... Air hole, 6 ... First chassis, 7 ... Image processing unit, 8 ... First interface, 9 ... Switching power supply, 10 ... Blower, 11 ... Second interface, 12 ... Second front panel, 13 ... Disk or cassette insertion / ejection port, 14 ... Second Cover, 15 ... Film, 16 ... Printed circuit board, 17 ... Partition wall, 18 ... Second chassis, 19 ... Turntable, 20 ... Motor, 21 ... Optical pickup, 22 ... Objective lens, 23 ... Optical pickup drive unit, 24 ... Rails, 25 ... Disc insertion / ejection mechanism, 26 ... Studs, 27 ... Lever, 28 ... Lever rotation shaft, 29 ... 30 ... First lid, 30a ... Rotation axis of first lid, 31 ... Second lid, 31a ... Rotation axis of second lid, 31b ... Stud of second lid, 32 ... First Spring, 33 ... Second spring, 34 ... Set of drive unit mechanism, 35 ... Disk case, 36 ... Disk, 51, 51 '... Rotation speed control circuit, 53 ... Read / write circuit, 54 ... Positioning control circuit, 55 ... Control circuit of built-in type optical disk device, 56 ... Buffer, 57 ... Register, 58 ... Main memory device, 59 ... Stand-alone type optical disk device control unit, 60 ... Display, 61 ... Keyboard, 62 ... Laser beam printer, 63 ... optical disk device, 64 ... host computer, 201 ... wall.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniyuki Kimura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Stock company Hitachi Works Yokohama factory

Claims (4)

[Claims] 1. An optical recording / reproducing device or a magneto-optical recording / reproducing device used as a storage device, comprising a turntable for rotating a disc and an optical pickup for recording / reproducing information on / from the disc by using a laser beam. (Less than,
In the optical recording / reproducing device or the magneto-optical recording / reproducing device, abbreviated as an optical disc device), a disc insertion having a function of positioning the optical disc on the recording / reproducing means of the optical disc device and a function of ejecting the optical disc device to the outside One set or a plurality of sets of a drive unit mechanism formed by assembling a discharge mechanism, an optical pickup drive mechanism that transfers an optical pickup to a specified track position in the radial direction of the disc, and a motor unit mechanism that rotates the disc. The whole surface is sealed with a front panel and one or more pairs of lids biased in the direction to close the disc insertion / ejection port with a spring, and the lower surface and both side surfaces are sealed with a chassis, and the rear surface has a special partition wall. With a printed circuit board on which the electronic circuit of the optical disk device is mounted. The upper part sealed substantially sealed with a cover, the cover or and clearance of the chassis, the optical disk apparatus characterized by the sealing the holes in the film sealing the set of drive unit mechanism including the optical pickup. 2. The apparatus according to claim 1 is incorporated as a built-in type optical disk apparatus into a stand-alone optical disk apparatus equipped with a separate image processing unit, and each is sealed or partitioned by a wall. An optical disk device characterized in that 3. The storage capacity of a buffer according to claim 1, wherein the rotation speed of the motor is multiplied by 200 to 530 rpm, or the data input from the optical pickup is temporarily stored. An optical disk device characterized by being multiplied by a plurality of times. 4. An optical disk device comprising a plurality of the devices according to claim 1 arranged in a case, a blower in the case, and an air hole in the case.