JPH06139585A - Optical disk device - Google Patents

Abstract

PURPOSE:To make a device compact and to prevent the deterioration in signal read performance caused by mechanical vibration and optical positional accuracy by moving a carriage base whose planar area is remarkably smaller than that of a cartridge and connecting an optical disk to a spindle motor part. CONSTITUTION:The carriage base 15 is placed downward by engaging a slide plate 25 with a guide pin 27 when the cartridge 2 is inserted to an optical disk device through a port 34. Then, the cartridge 2 abuts on a cartridge detection lever 30 when the cartridge 2 is further pushed in the inner part, and a trigger pin 28 abutting on the lever 30 by a slide leaf spring 26 is detached, and the slide plate 25 is moved by the spring 26. In such a manner, the guide pin 27 restricted by the slide plate 25 is released, and the base 15 is moved upward along a slide shaft 23 by the action of other slide spring 24, and the optical disk 1 is fitted to a turnable 20.

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 for reproducing or recording / reproducing data from a recording medium such as a CD-ROM, a magneto-optical recording medium or a phase change recording medium.

[0002]

2. Description of the Related Art In recent years, there has been an increasing tendency for optical disc devices to be made smaller and thinner so that they can be mounted on small information devices such as portable devices (for example, see Japanese Patent Laid-Open No. 4-195730).

A conventional optical disk device will be described below. As shown in FIG. 11, the optical disc board 4 of the recording medium
1 is rotatably stored and held in the cartridge 42. Openings 42a are formed on both upper and lower surfaces of the cartridge 42. The housing 43 of the optical disk device is formed with an insertion opening 43a of the cartridge 42. A spindle motor 45 for rotating the optical disc 41 fixed to the device base 44 is provided with a turntable 46 for clamping the optical disc disc 41 so as to rotate synchronously. The external magnetic field 47 used when recording information on the optical disc board 41 is
Are arranged in the radial direction of the optical disk disc 41 along the opening 42a on the upper surface side of the optical disc 41, and are movable in the direction of coming into contact with and separating from the cartridge 42. Equipment base 44
The fixed optical section 48 fixed to the optical disk board 41 is provided with a laser emitting means for irradiating the optical disk board 41 with laser light, a detection section for detecting return light from the optical disk board 41, an optical component, and the like. The movable optical unit 49 includes a fixed optical unit 4
Optical components for guiding and focusing the laser light from the optical disc 7 to the optical disc board 41, focus driving means, and tracking driving means are provided. An access drive unit 50 for moving the movable optical unit 48 in the radial direction of the optical disc board 41.
Is composed of a guide rail that supports the movable optical unit 49, a permanent magnet that serves as a drive source, a coil, and the like. 51 in the figure
Is a control board having a circuit and is fixed to the apparatus base 44.

The operation of the optical disk device configured as described above will be described below. As shown in FIG. 12A, when the cartridge 42 is inserted into the housing 43 from the insertion opening 43a in the direction shown by the arrow A, the inserted cartridge 42 is shown by the chain double-dashed line in FIG. 12B. As described above, after the opening 42a is locked at a predetermined position in an open state, by a moving means (not shown) in the direction perpendicular to the surface of the optical disc board 41 (direction shown by an arrow B) about 5 mm from that position. It is lowered, and as shown in FIG.
The turntable 4 in which the center of the optical disc board 41 rotates in synchronization with the spindle motor 45 through the opening 42a on the lower surface.
6 is fitted. At this time, the movable optical section 49 is inserted into the optical disc board 41 through the lower opening 42a of the cartridge 42.
It is possible to irradiate the optical disc board 41 with laser light from the fixed optical section 48. At the same time, the external magnetic field 47 is moved by the moving means (not shown) on the upper surface of the opening 42a.
The optical disk disc 41 is lowered in the direction indicated by the arrow B to move to the position indicated by the chain double-dashed line.
In this state, the spindle motor 45 is driven to rotate the optical disk board 41, and the laser light emitted from the fixed optical section 48 is passed through the movable optical section 49 to the optical disk board 41.
Recording information and servo error information are obtained by returning the reflected light to the detection section of the fixed optical section 48 via the movable optical section 49, and the focus driving means and tracking driving means in the movable optical section 49 Access driver 5
The information of the optical disc board 41 is recorded and reproduced by 0.

Next, another conventional optical disk device will be described. The same components as those described in the above conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The difference from the above-mentioned conventional example is that, as shown in FIG. 13, the spindle motor 45 is moved in a direction (a direction indicated by an arrow C) with respect to the cartridge 42 by a driving means (not shown). This is a possible point.

The operation of the optical disk device configured as described above will be described below. As shown in FIG. 14 (a), when the cartridge 42 is inserted into the housing 43 from the insertion opening 43a in the direction shown by the arrow D, the inserted cartridge 42 is at a predetermined position as shown in FIG. 14 (b). , The opening 42a is locked in the opened state, and the spindle motor 45 located at the position indicated by the chain double-dashed line moves in the direction perpendicular to the surface of the optical disc board 41 (the direction indicated by the arrow E) (not shown). ), The lower opening 42a
The center of the optical disc 41 is through the spindle motor 4
It is fitted to a turntable 46 that rotates in synchronization with the No. 4. At this time, the movable optical section 49 faces the optical disc board 41 through the lower surface opening 42a of the cartridge 42, and the laser beam from the fixed optical section 48 can be applied to the optical disc board 41. In this state, the information on the optical disc board 41 is recorded / reproduced by the same operation as described in the above-mentioned conventional example.

[0008]

However, in the above-mentioned conventional configuration, since the cartridge 42 having a large area in the plane is moved up and down to couple the optical disk board 41 and the spindle motor 45, the total amount of the cartridge 42 including the moving portion is moved. The problem is that the volume becomes large and the volume of the optical disk device as a whole becomes large, and the wasted space can be reduced by moving the spindle motor 45 having a small area, but an optical system device (fixed optical system) that serves as a reference for signal detection. Section 48, movable optical section 49) and spindle motor 4
Since No. 5 is separated, there is a problem that the signal reading performance is deteriorated due to vibration due to mechanical backlash and optical position accuracy.

The present invention solves the above-mentioned problems of the prior art. It is compact in that wasteful space is eliminated, and reliability that signal reading performance does not deteriorate due to vibration due to mechanical backlash and optical position accuracy. It is an object of the present invention to provide a high-performance optical disk device.

[0010]

In order to achieve this object, an optical disk device of the present invention comprises a spindle motor section for rotating a recording medium, a laser unit for emitting and detecting a laser beam, and a laser beam for the recording medium. The carriage base holding the condenser lens for condensing and the actuator means for driving the condenser lens in the focus direction and the tracking direction is movable in the direction of approaching and separating from the cartridge.

[0011]

In this configuration, the optical disc device and the spindle motor unit are coupled by moving the carriage base whose plane area is much smaller than that of the cartridge, and the optical system device (laser unit and focusing unit) that serves as a reference for signal detection. The lens, the actuator means), and the spindle motor unit are integrally formed on the carriage base.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a laser unit 4 in which a semiconductor laser for emitting a laser and a photodetector for generating a current by receiving the light are integrated is arranged on a movable base 5 and diffracted. A hologram plate 6 provided with a grating is arranged in the laser unit 4. A pair of reflection mirrors 7 for guiding the laser light emitted from the laser unit 4 are fixed to the movable base 5, and a condenser lens 8 for condensing the laser light from the reflection mirror 7 on the optical disc board 1. , Is fixed to the bobbin 9. A support spring 10 having one end fixed to the movable base 5 and the other end fixed to the bobbin 9 moves the bobbin 9 with respect to the movable base 5 in the focus direction (arrow F).
It is possible to move in the direction indicated by.

The actuator means for driving the condenser lens 8 in the focus direction and the tracking direction is composed of a focus coil 11 wound around a bobbin 9 and a pair fixed to the movable base 5 so as to face the focus coil 11. Of focus magnet 12, a tracking coil 13 fixed to the movable base 5, and a tracking magnet 16 having a two-pole split magnetized surface,
It is fixed to the carriage base 15.

Part of the tracking coil 13a, 1a
A pair of back yokes 14 made of a ferromagnetic material are arranged at 3b, and each faces only one split surface of the tracking magnet 16 in the moving range of the movable base 5.

The spindle motor portion for rotating the optical disc board 1 is a bearing 18 fixedly mounted on the carriage base 15.
A spindle coil 19 arranged around the bearing 18 and fixedly mounted on the carriage base 15, and a turntable 20 for holding the optical disk disc 1 fitted to the bearing 18 and rotatably supported. It is composed of a spindle coil 21 and a spindle magnet 21 which is fixed to the turntable 20 so as to face the spindle coil 19.

The slide shaft 23, which is erected on the device base 22 which is a part of the housing of the optical disk device, is fitted with the slide bearing portion of the carriage base 15 so that the carriage base 15 can slide with respect to the device base 22. Has been done. A slide spring 24 arranged on the axis of the slide shaft 23 biases the carriage base 15 in the direction indicated by an arrow G. The slide plate 25 that slides on the device base 22 is biased by the slide plate spring 26 in the direction indicated by the arrow H, and the slide plate 25 contacts the guide pin 27 provided on the carriage base 15 by the slide spring 24. Touching. A cartridge detection lever 30 rotatably attached to a pin 29 provided on the device base 22 is arranged on a slide plate 25 and is engaged with a trigger pin 28.

Further, the electric components such as the laser unit 4, the focus coil 11, the tracking coil 13, and the spindle coil 19 on the carriage base 15 are arranged and connected on one substrate 33 (a portion shown by hatching in FIG. 3). Has been done.

In the figure, 17 is a shaft for sliding the movable base 5 and the carriage base 15, 31 is a lever spring for urging the cartridge detecting lever 30, and 32 is a control in which a circuit fixed to the apparatus base 22 is constructed. The substrate 34 is an insertion port of the cartridge 2 formed in the housing.

The optical disc board 1 is rotatably housed in a cartridge 2 and provided with a shutter 3. Normally, in order to protect the optical disc board 1, the shutter 3 is closed as shown in FIG. It is in. When recording / reproducing recorded information on / from the optical disc board 1, as shown in FIG. 6, the shutter 3 is opened and openings 2a and 2b are formed on the upper and lower surfaces of the cartridge 2. In this embodiment, the cartridge 2 has openings 2a and 2b formed on the upper and lower surfaces thereof. However, if the cartridge 2 has at least one opening for recording / reproducing information on / from the optical disc board 1, this embodiment It can be handled as in the example.

The operation of the optical disk device configured as described above will be described below. As shown in FIGS. 7 and 8, when the cartridge 2 is inserted into the optical disk device through the insertion opening 34 of the housing in the direction indicated by the arrow I, the carriage base 15 is lowered by the engagement of the slide plate 25 and the guide pin 27. Located in. When the cartridge 2 is further inserted further, the cartridge 2 comes into contact with the cartridge detecting lever 30, and when the cartridge detecting lever 30 is rotated, the slide pin spring 26 comes into contact with the cartridge lever 30 and the trigger pin 28. Moves away from the cartridge detection lever 30, and the slide plate 25 moves in the direction indicated by arrow J by the action of the slide plate spring 26. When the slide plate 25 moves, the guide pin 25, which is constrained by the slide plate 25, is released, and the action of the slide spring 24 causes the carriage base 1 to move.
5 moves upward along the slide shaft 23, and
Then, the state shown in FIG. 10 is obtained, and the optical disc board 1 is fitted with the turntable 20. Next, when the spindle coil 19 is energized, the turntable 20 and the turntable 2 are caused by the electromagnetic action of the spindle magnet 21.
The optical disk disc 1 held at 0 rotates. Further, the laser light emitted from the laser unit 4 is guided to the condenser lens 8 by the reflection mirror 7, and the focus coil 11 is energized to operate the condenser lens 8 in the focus direction by the electromagnetic action with the focus magnet 12. Riyori,
It is possible to focus the laser light on the optical disc board 1 in an optimum state. The reflected light from the optical disc board 1 is guided to the photodetector in the laser unit 4 by the hologram plate 6 via the reflection mirror 7. Further, when the tracking coil 13 is energized, the movable base 5 is moved to the carriage base 15 by the electromagnetic action with the tracking magnet 16.
On the other hand, it can be moved in the radial direction of the optical disc board 1. Information on the optical disc 1 can be recorded / reproduced by combining the above operations.

When the slide plate 25 is pushed to eject the cartridge 2, the carriage base 15 is moved downward due to the engagement of the slide plate 25 and the guide pin 27 in reverse to the above-mentioned operation, and the optical disc board 1 and the turntable. The fitting of 20 is released. Further, since the trigger pin 28 moves, the engagement state with the cartridge detection lever 30 is released, and the cartridge detection lever 30 is rotated by the action of the lever spring 31 and the cartridge 2 can be ejected.

As described above, according to the present embodiment, the spindle motor portion for rotating the optical disc board 1, the laser unit 4 for emitting and detecting light, and the laser unit 4 are provided.
A carriage base 15 for holding the condenser lens 8 for condensing the laser light from the optical disc board 1 on the optical disc board 1 and the actuator means for driving the condenser lens 8 in the focus and tracking directions is brought into contact with and separated from the cartridge 2. Since the carriage base 15 having a plane area much smaller than that of the cartridge 2 is connected to the optical disc board 1 and the spindle motor section by the structure that allows the optical disc device to be moved in any direction, useless space of the optical disc device is eliminated and the optical disc device is portable. A compact device suitable for the above can be realized, and an optical system (consisting of the laser unit 4, the condenser lens 8 and the actuator means) and a spindle motor section which are a reference for signal detection and a spindle motor section are integrally formed on the carriage base 15. Read due to mechanical vibration and optical system position accuracy. It is possible to reduce the deterioration of the performance.

Further, since the electric components such as the laser unit 4, the focus coil 11, the tracking coil 13, and the spindle coil 19 on the carriage base 15 are arranged and connected on one substrate 33, the assemblability and noise resistance are improved. Is excellent.

In this embodiment, the carriage base 15
Although spring force was used as the raising and lowering drive source for the carriage, the motor is used to move the carriage base 15 up and down by sliding the slide cam that is in contact with the guide pin 27 by the drive transmission of gears or the like, or an electromagnetic solenoid is used instead of the motor. You may use.

Further, the structure of the actuator means shown in this embodiment is not limited, and the focus driving means and the tracking driving means may be constituted by using the same magnetic circuit as the actuator means of the condenser lens 8. ,
The parts configuration and layout of the optical system are not limited to those shown in this embodiment.

[0027]

As is apparent from the above description, the present invention provides a spindle motor unit for rotating a recording medium, a laser unit for emitting and detecting light, and a condenser lens for condensing the laser beam on the recording medium. And a structure in which the carriage base holding the condensing lens and the actuator means for driving the focusing lens in the focus direction and the tracking direction can be moved in the direction in which the carriage base is moved toward and away from the cartridge. It is possible to realize a highly reliable and excellent optical disk device in which the signal reading performance due to vibration due to vibration and the positional accuracy of the optical system does not deteriorate.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a plan view of an essential part of FIG.

FIG. 3 is a plan view of a carriage base of the optical disk device.

4 is a schematic cross-sectional view of a main part of FIG.

FIG. 5A is a plan view of the cartridge of the optical disk device with the shutter closed, and FIG. 5B is a bottom view of FIG.

FIG. 6A is a plan view of the cartridge of the optical disk device in a state where a shutter is opened, and FIG. 6B is a bottom view of FIG.

FIG. 7 is a schematic cross-sectional view showing a state at the start of mounting a cartridge of the optical disk device.

8 is a plan view of an essential part of FIG.

FIG. 9 is a schematic cross-sectional view showing a state at the end of mounting the cartridge of the optical disk device.

FIG. 10 is a plan view of an essential part of FIG.

FIG. 11 is a schematic sectional view of a conventional optical disc device.

FIG. 12 (a) is a schematic sectional view showing a state when a cartridge of the optical disc device is mounted, and FIG. 12 (b) is a schematic sectional view showing a state of the optical disc device when the cartridge is mounted.

FIG. 13 is a schematic sectional view of another conventional optical disk device.

FIG. 14A is a schematic cross-sectional view showing a state when the cartridge of the optical disc device is started to be mounted. FIG. 14B is a schematic sectional view showing a state when the cartridge of the optical disc device is finished to be mounted.

[Explanation of symbols]

 1 Optical Disc Board (Recording Medium) 2 Cartridge 4 Laser Unit 8 Condensing Lens 11 Focus Coil (Actuator Means) 12 Focus Magnet (Actuator Means) 13 Tracking Coil (Actuator Means) 15 Carriage Base 16 Tracking Magnet (Actuator Means) 18 Bearing ( Spindle motor part 19 Spindle coil (spindle motor part) 20 Turntable (spindle motor part) 21 Spindle magnet (spindle motor part)

Claims (3)

[Claims] 1. An optical disk device for reproducing or recording / reproducing data on / from a recording medium through an opening formed in a cartridge having a recording medium rotatably housed therein, wherein the recording medium is rotated. A spindle motor unit for driving, a laser unit for emitting and detecting laser light, a condenser lens for condensing the laser light from the laser unit on the recording medium, and a driving of the condenser lens in the focus direction and the tracking direction. An optical disk comprising: an actuator means, a spindle motor section, the laser unit, the condenser lens, and a carriage base that holds the actuator means and is movable in a direction to move toward and away from the cartridge. apparatus. 2. The laser unit, the condenser lens and the actuator means are movable in the tracking direction.
The optical disk device described. 3. The optical disk device according to claim 1, wherein the components constituting the spindle motor section, the laser unit, and the actuator means are arranged and connected on one substrate.