JPH03250487A - Optical disk driving device - Google Patents

Abstract

PURPOSE:To remove the bad influence of a heating source such as a voice coil motor in a driving unit and a driving base upon a optical system by mounting the driving unit and the driving base on a frame as a compact unit. CONSTITUTION:A space formed between the lower side of a base 22 and an internal cover 40 covering the driving base 37 is aligned to vent ports 5, 13 formed on the frame 10 and a front panel 2 and a clean cooling air obtained by flowing air through the vent ports and removing dust from the inflow air through a filter 5a arranged on the panel 2 is passed through the space and exhausted from the aperture of a rear frame. The flow of the cooling air is shown by the arrow A. Thereby, the heating materials such as a spindle motor mounted on the base 22 and the voice coil motor(VCM) are cooled without interrupting the driving of the optical system by dust or the like. Although comparatively high heat is generated from the driving base 37, the heat is not transmitted to the optical system arranged on the base 22 because it is interrupted by the cover 40. The heat of the cover 40 is cooled by cooling air existing on the surface of the base 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disk drive device that efficiently eliminates heat generated from an internal substrate.

[Prior Art] Optical disc drive apparatuses that use light beams to read information from or record information on optical discs that are high-density information recording media are well known.

In general, this type of optical disk drive device uses a voice coil motor to move a carriage equipped with an optical pickup in order to enable the optical pickup knob to access a desired track of an optical disk rotated by a spindle motor from the radial direction at high speed. (also called VCM). These spindle motors and VCMs are mounted on a rigid base. The drive coil portion of this VCM generates a considerable amount of heat, which together with the heat from other components causes thermal expansion of the optical system components of the optical disk drive device, causing adverse effects such as changes in the optical axis.

For example, Japanese Patent Laid-Open No. 62-80178 discloses that in order to prevent the adverse effects of the heat mentioned above, a carriage movement path recessed in the base is used as a cooling air circulation path, and a built-in cooling fan circulates the cooling air. let This cooling air is supplied through a filter that removes foreign matter such as dust from the outside air, and an air room that blocks warm air inside is arranged in the supply path.

[Problems to be Solved by the Invention] According to the conventional optical disk drive device described above, since a cooling fan and an air room are built in, the entire device becomes bulky. Therefore, when using an optical disk subsystem or a built-in optical disk computer type, it is necessary to increase the size and
The cost will be high. Furthermore, in order to create such a compact device, it is necessary to place a board with a heat source for control etc. in close proximity to a base mounted with an optical system such as an optical pickup, and the heat generated by these boards It is necessary to consider the effect of

The present invention has been made in view of the above, and it is an object of the present invention to provide a compact disk drive device that eliminates the adverse effects on the optical system due to heat sources such as the VCM and the board.

[Means for Solving the Problems] An optical disc drive device according to the present invention includes a frame having an insertion slot for a cartridge containing an optical disc and a cooling air vent formed in the front part and an open rear part, and a frame mounted on the frame. a base having a drive mechanism for rotating an optical disc in a cartridge and an optical head for reading at least information recorded on the optical disc; and a loading mechanism provided on the base to operate the optical disc at a position aligned with the insertion slot. a cartridge holder that moves between an operating position where the cartridge is rotated by the drive mechanism; a drive base that is fixed to the frame at a position facing the base through the vent and that controls the drive mechanism; and an inner cover that covers the side of the base facing the base and rectifies the cooling air through the vent.

[Operations] The optical disk drive device of the present invention includes, in one frame,
The base and the drive base are placed opposite to each other through the vents formed therein, resulting in an overall compact structure. An internal cover is arranged between the base and the drive base. This internal cover covers the electronic components mounted on the drive board, insulates the heat generated by these electronic components, and makes the cooling air flow through the vents into a laminar flow along this surface portion. Therefore, cooling air constantly flows through the small gap between the base and the drive board, and the optical system disposed on the base is reliably cooled.

[Embodiment] FIG. 2 shows the overall structure of a magneto-optical disk subsystem according to an embodiment of the present invention. Drive device l is front panel 2
It is housed in the housing 3 of the subsystem along with other appropriate devices and connected to the computer via an appropriate cable. A cooling fan 4 is disposed in the housing 3, and sucks cooling air through a grid-like vent 5 formed in the front panel 2 and an appropriate air filter disposed inside the vent, thereby cooling the inside of the drive device 1. Can be cooled. Reference numeral 6 denotes an insertion slot for a magneto-optical disk cartridge, and reference numeral 7 denotes an ejector button for ejecting the magneto-optical disk cartridge from the disk drive device 1 through the insertion slot 6.

Fig. 1 shows the internal structure of the drive device 1, Fig. 3 shows the connection part with the front panel, and Fig. 4 shows the drive device 1.
The configuration is shown below.

As shown in FIGS. 1 and 4, the drive device 1 has a U-shaped frame 10 with an opening at the rear, and a rear frame 11 having a large number of through holes is attached to the rear opening. The front part of the frame 10 has an insertion opening 12 and a ventilation opening 1 that are aligned with the insertion opening 6 and the ventilation lower of the front panel 2, respectively.
3 is formed. Further, three holes are formed in each side, such as escape holes for members to be installed inside, but these holes are closed from the inside with a seal plate (not shown).

As shown in FIG. 3, a filter 5a is provided in the vent 5 of the front panel 2 attached to the front of the frame 10.
Further, a sealing member 2a is attached to the periphery of the filter 5a that contacts an internal cover, which will be described later, and to the periphery of the opening for the ejector button. These sealing members 2a can be made of any suitable material, but are preferably made of elastic thin columnar members.

An insulator 1 is provided in the vertically intermediate portion of the frame 10.
The drive unit 20 is attached via 5. This insulator 15 elastically attaches the drive unit 20 to four protrusions 14 bent inwardly from the front and rear parts of the frame 10, and supports the drive unit 20 as shown in FIG. metal support member 1
5a, and a buffer member 15b made of an elastic member such as resin.
and has. This buffer member 15b is formed in the shape of a bush having a small diameter central portion, and this central portion is inserted into an opening formed in the protruding piece 14.

Thereby, the frame 10 and the drive unit 20 can be electrically insulated and vibration transmission can be prevented.

The drive unit 20 includes a base 22 that is attached to the frame 10 via an insulator 15, and a cartridge holder 24 that accommodates an optical disk cartridge. A field unit 25 is arranged in this cartridge holder to apply an external magnetic field to the magneto-optical disk during recording and erasing. The upper part of this field unit 25 is covered with a dustproof cover, and is interlocked with the cartridge holder. As shown in FIG. 1, a turntable 26 for rotating an optical disk and an optical head 28 are arranged above the base 22. This turntable is rotated by a spindle motor 27, and the optical head 28 is rotated by a spindle motor 27. It is moved via a carriage 29 using a normal VCM.

FIG. 1 shows a guide roller 29b that guides the carriage 29 along a guide bar 29a (FIG. 4).

The base 22 further includes a position for aligning the cartridge holder 24 with the insertion opening 12 of the frame, and a drive unit 20.
A rope ink mechanism is provided that moves between adjacent locations. FIG. 1 shows this loading motor 30, and FIG. 4 shows a gear mechanism 33 that moves the cartridge holder 24 via a support plate 34 along a guide groove 32 of a guide plate 31 fixed to the base 22. Diagrammatically shown.

FIG. 5 shows the relationship between the optical disc cartridge 8 containing the optical disc 9 and the drive unit 20. When the optical disc cartridge 8 is inserted into the cartridge holder 24, the opening/closing mechanism provided in the cartridge holder 24 opens the opening/closing lid 8a of the cartridge 8.
The cartridge holder is moved to the loading position by the loading mechanism, and the optical disc 9 is rotated by the turntable 26. The optical head 28 is moved to a desired track position by the VCM.

As shown in FIGS. 1 and 4, the drive unit 20
A control base 35 is disposed above the frame 10, and the base 35 is fixed to the frame 10 by fixing members such as screws. This control board 35 has the main function of controlling the drive based on commands from the host computer, and has functions of decoding SC8I commands and correcting errors. In addition, a drive board 3 is placed on the lower side of the drive unit 20 at a small interval through the ventilation hole 13 of the frame 10.
7 is arranged, and this drive base 37 is fixed to the mounting piece of the frame 10 with a suitable fixing member such as a screw. This drive board 37 has a power control circuit for the semiconductor laser light source in the optical head, a processing circuit for reading information from the magneto-optical disk 9, a control circuit for moving the optical head in the radial direction of the disk, a loading drive circuit, etc. FIG. 4 schematically shows the various electronic circuits that make up these circuits.

Further, sheet plates 36 and 38 made of thin metal plates are arranged above and below the control board 35 and the drive board 37, respectively, so that dust can enter through the gaps between the frame and each board. In addition to preventing this, it also shields the base.

As shown in FIG. 4, a large number of electronic components are mounted on the drive base 37 at small intervals from each other. During operation, these electronic components are connected to the optical head 28 of the base 22 facing each other with a slight gap between them. generates heat that has an adverse effect on the optical system, etc. Further, these electronic components protrude into the small space between the drive base IIM 37 and the base 22, and together with the members hanging down from the base 22, obstruct the flow of cooling air through the vent 13.

The magneto-optical disk drive device 1 of this embodiment covers the electronic components of the drive board 37 with an inner cover 40 made of a thin plate shown in FIG. 4 to prevent the flow of cooling air from being obstructed by these electronic components. At the same time, it blocks the heat generated,
This prevents the temperature of the optical system provided on the base 22 from rising.

This inner cover 40 has leg portions 42 extending upward along both side edges of a flat portion 41. As shown in FIG. This flat portion 41 covers the electronic components of the drive board 37, smoothly guides clean cooling air that has flowed in through the vents 5 and 13 and the filter 5a, and blocks the heat generated from these electronic components. The legs 42 are inserted into the drive unit 20 to prevent dust and the like from entering the sides of the optical system through the gap between the drive base 37 and the frame 10.

These legs 42 are appropriately formed with holes through which cables for electrically connecting the required components of each board or drive unit are inserted, and dust is prevented from entering through these cable holes. is preferred. FIG. 6 shows the inner cover 40 attached to the lower side of the drive unit 20, and in the illustrated embodiment, two thin sealing plates 47 are used to close the cable hole.

The inner cover 40 can be formed of an appropriate insulating material and into an appropriate shape, but the inner cover 40 can be made of an appropriate insulating material and has an appropriate shape.
The side facing 0 is preferably formed as smooth as possible. Further, it is not necessary to completely cover the entire drive board 35 as long as it can be extended to the front part and the range where the optical system is arranged.

This is because the rear part is close to the fan 4. Note that reference numeral 43 is a relief hole that accommodates the lower end of the rotor of the spindle motor 27 so that it does not come into contact with it.

A buffer pad 44°45.46 is provided on the lower surface of the inner cover 40.
is installed by appropriate means. The buffer pad 44 has a ring shape and is attached to the periphery of the escape hole 43. The buffer pad 45 has a rectangular shape and is attached at a position corresponding to the yoke of the VCM. These buffer pads 44.
The lower surface of the drive board 45 is pressed directly by the drive board 37 or by an electronic member firmly attached thereto, and the base 22 is urged upward via this inner cover, the spindle motor 27 of the base 22, and the yoke of the VCM. Further, the buffer pad 46 contacts the drive board 37 and the inner cover 40
It elastically supports the base 37 and closes the gap with the base 37. Note that these buffer pads 44, 45, and 46 can be placed at appropriate positions as long as they can bias the inner cover 40 and base 22.

In order to prevent dust etc. from entering between the base 22 and the internal cover 40 from the insertion opening 22 on the upper side of the base 22,
The front upper side of the base 22 attached to the frame 10 via the insulator 15 closes the gap between the base 22 and the frame 10 by a cut-off plate 48, and the sides of the two insulators 15 are complicated. It is sealed with a sponge-like sealing member 49 that can accommodate various shapes. Also, frame 1
A cartridge door 12a for opening and closing the insertion slot 12 is pivotally mounted on the upper side of the cartridge door 1.2a, and a band-shaped sealing member 52 made of an elastic material is attached along the proximal edge, that is, the upper edge of this door 1.2a. It is arranged. Furthermore, three block-shaped seal members 51 similar to the seal member 49 are arranged between the rear part of the base 22 and the rear frame.

Furthermore, in this embodiment, a thin columnar sealing member 50 that prevents dust and the like from entering between the drive base 37 and the frame 10 extends from the front portion of the lower edge of the frame 10.

According to the disk drive device 1, as shown in FIG.
5.37 is installed in a compact manner, and the inside of the frame 10 is divided into upper and lower halves around the base 22 of the drive mechanism.

On the upper side of the base 22, the insertion opening 12 is connected to the cartridge door 12.
a and the band-shaped sealing member 52, so when no magneto-optical disk cartridge is inserted, external air hardly ever enters due to the suction force of the cooling fan. Furthermore, even if the cartridge door 12a is opened during insertion,
Because there are no obstacles with a complicated structure, the rear frame 1
It is discharged directly through the opening of 1. In this case, the base 22 is closed by the obstructing plate 48 and the sealing member 49.
The front and rear parts of the base 22 are sealed, and an internal cover 4 is attached to the side of the base 22.
Since the legs 42 of the base 2 are extended, external air is
There is no fear of it going around to the bottom of 2.

On the lower side of the base 22, a space formed between the drive base 37 and the inner cover 40 is aligned with the ventilation hole 5°13 formed in the frame 10 and the front panel.
These vents flow into the front panel filter 5.
Clean cooling air from which dust has been removed in step a passes through this space and is exhausted from the opening in the rear panel. This flow of cooling air is indicated by arrow A. Therefore, the heat generating members such as the spindle motor 27 and the VCM mounted on the base 22 are cooled without the operation of the optical system being affected by dust.

During operation, the drive board 37 generates considerable heat;
This heat is blocked by the inner cover 40 and does not reach the optical system placed on the base. Even if the inner cover 40 is heated,
Since the surface on the side of the base 22 is formed smoothly, efficient cooling is achieved by the layered cooling air flowing along this smooth surface.

[Effects of the Invention] As is clear from the above, according to the optical disk drive device of the present invention, the drive unit and the drive board can be compactly mounted on the same frame, and the adverse effects on the optical system caused by heat sources such as the VCM and the board of the drive unit can be avoided. can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of an optical disk drive device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a subsystem using the optical disk drive device of FIG. 1, and FIG.
4 is a schematic exploded perspective view of the optical disk drive device shown in FIG. 1, FIG. 5 is an explanatory diagram of the drive unit and optical disk cartridge of the optical disk drive device, and FIG. 6 is a view taken along the line ■-■ in the figure. 2 is a perspective view showing how the drive unit and the internal cover are attached. FIG. DESCRIPTION OF SYMBOLS 1...Magneto-optical disk drive device, 2...Front panel, 4...Fan, 5.13...Vent, 6.1
2... Insertion port, 10... Frame, 11... Rear frame, 14... Projection piece, 15... Insulator, 2o... Drive unit, 22... Base, 26
... Turntable, 28... Optical head, 3o.
...Loading motor, 33...Gear mechanism, 35.
... Control board, 36.38 ... Sheet board, 3
7... Drive base, 40... Internal cover 44.
45.46...Buffer pad.

Claims (2)

[Claims] (1) A frame with an insertion port for a cartridge containing an optical disk and a cooling air vent formed in the front and an open rear part; a drive mechanism attached to the frame that rotates the optical disk in the cartridge; A base having an optical head for reading recorded information, and a loading mechanism provided on the base actuated to move between a position aligned with the insertion slot and an operating position where the optical disc is rotated by the drive mechanism. a cartridge holder that moves; a drive base that is fixed to the frame at a position facing the base via the ventilation hole and controls a drive mechanism; an internal cover for rectifying cooling air through the optical disk drive device. (2) The optical disk drive device according to claim 1, wherein the base is attached to a frame via an insulator, and at least one buffer pad supporting the base is disposed between the inner cover and the base.