JP3433327B2 - Optical disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing or recording / reproducing data from a recording medium such as a CD-ROM, a magneto-optical device, and a phase change. 2. Description of the Related Art In recent years, there has been an increasing tendency to reduce the size and thickness of optical disk devices so that they can be mounted on small information devices such as portable devices (for example, see Japanese Patent Application Laid-Open No. 4-195730). [0003] A conventional optical disk device will be described below. As shown in FIG.
1 is rotatably stored and held in the cartridge 42. Openings 42 a are formed in both upper and lower surfaces of the cartridge 42. An insertion opening 43a for the cartridge 42 is formed in the housing 43 of the optical disk device. The spindle motor 45 for rotating the optical disc 41 which is fixed to the apparatus base 44 turntable 46 for clamping the optical disk plate 41 is disposed so as to synchronize Rotation. An external magnetic field 47 used when recording information on the optical disc 41 is
It is arranged in the radial direction of the optical disk board 41 along the opening 42a on the upper surface side of the optical disk board 41 and is movable in the direction of coming and going with respect to the cartridge 42. Equipment base 4
The optical disc board 41 is fixed to the fixed optical section 48 fixed to the optical disc 4.
Such detector and optics for detecting the return light from the laser emitting means and the optical disk plate 41 for radiating a laser beam is disposed, the movable optical unit 49, a laser from the fixed optical unit 4 8 An optical component for guiding and condensing light to the optical disk board 41, and a focus driving unit and a tracking driving unit are provided. Access drive unit 5 for moving the movable optical unit 4 9 in the radial direction of the optical disk plate 41
Reference numeral 0 denotes a guide rail for supporting the movable optical section 49, a permanent magnet or a coil serving as a driving source, and the like. 5 in the figure
Reference numeral 1 denotes a control board on which a circuit is configured, which is fixed to the device 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 port 43a in the direction indicated by the arrow A, the inserted cartridge 42 is indicated by a two-dot chain line in FIG. As described above, after the opening 42a is locked at the predetermined position in an open state, the moving means (not shown) is moved from the position by about 5 mm in the direction perpendicular to the surface of the optical disk board 41 (the direction shown by arrow B). And as shown in FIG. 12 (b),
The turntable 4 in which the center of the optical disc 41 rotates synchronously 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 moved to the optical disc board 41 through the lower 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. At the same time, the external magnetic field 47 is moved by the moving means (not shown) to the upper opening 42a.
And moves down to the position shown by the two-dot chain line so as to approach the optical disk board 41 in the direction shown by the arrow B.
In this state, the spindle motor 45 is driven to rotate the optical disc disc 41, and the laser beam emitted from the fixed optical section 48 is transmitted through the movable optical section 49 to the optical disc disc 41.
To be condensed, further reflected light is recorded information and servo error information is obtained by returning the detection portion of the fixed optical unit 48 via the movable light Faculty 49, focus drive means and tracking driving means in the movable optical unit 49 The access drive unit 50 records and reproduces information on the optical disk 41. Next, another conventional optical disk device will be described. The same components as those described in the above conventional example are denoted by the same reference numerals, and 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 (indicated by an arrow C) toward and away from the cartridge 42 by a driving means (not shown). It is possible. The operation of the optical disk device configured as described above will be described below. As shown in FIG. 14A, 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 moved to a predetermined position as shown in FIG. In this position, the opening portion 42a is locked in an open state, and the spindle motor 45 located at the position shown by the two-dot chain line moves in the direction perpendicular to the surface of the optical disk disk 41 (the direction shown by the arrow E) (shown in FIG. ) And the lower opening 42a
The center of the optical disk board 41 through the spindle motor 4
5 is fitted to a turntable 46 that rotates in synchronization with the turntable 5 . At this time, the movable optical section 49 faces the optical disk 41 through the lower opening 42 a of the cartridge 42, and the laser light from the fixed optical section 48 can be applied to the optical disk 41. In this state, the information on the optical disk 41 is recorded / reproduced by the same operation as that described in the above-mentioned conventional example. However, in the above-described conventional configuration, the cartridge 42 having a large area in the plane is moved up and down to couple the optical disc disk 41 and the spindle motor 45, so that the cartridge including the moving amount is required. The problem is that the total volume of the optical disk device 42 is increased, and the volume of the entire optical disk device is increased. Further, by moving the spindle motor 45 having a small area, useless space can be reduced. (Fixed optical section 48, movable optical section 49) and spindle motor 4
5, the signal reading performance is deteriorated due to vibration due to mechanical backlash and optical positional accuracy. The present invention solves the above-mentioned conventional problems, and eliminates useless space, is compact, and has reliability in which signal reading performance does not deteriorate due to vibration due to mechanical backlash or optical positional accuracy. It is an object of the present invention to provide an optical disk device with high performance. [0010] Means for Solving the Problems An optical disc device of the present invention in order to achieve this purpose, a spindle motor for rotating the recording medium, a laser unit with a laser beam emitted, also be detected, the a condenser lens for condensing the recording medium the emitted <br/> laser beam from the laser unit, and an actuator means for driving the condenser lens in the focusing direction and the tracking direction, out of the cartridge
Having a shape and dimensions that fit within a plane defined by the circumference,
A spindle motor, the laser unit, and the focusing laser.
Carriage holding a lens and the actuator means
A base, being inserted into the carriage base, said calibration <br/> ridge base movably supported parallel to and away direction with respect to the cartridge, is arranged around the carriage base
At least three slide shafts were, the carriage base and a driving means for moving in a direction to approach the cartridge is in position in the recording reproduction Katori
Cartridge and carriage base perpendicular to the disc surface
When viewed from the side, the carriage base is inside the outer circumference of the cartridge.
The carriage base and the
A cartridge, and the driving unit includes a biasing unit.
And a cartridge corresponding to the insertion amount of the cartridge.
And the insertion of the cartridge.
And the urging force of the urging means.
And a slide member for restraining the pressing force.
The carriage base is removed by the
The amount of movement approaching the edge is on the slope of the slide member.
Therefore, it is restrained and operates by inserting the cartridge.
To bring the carriage base close to the cartridge.
This is a configuration in which [0011] [act] In this configuration, a shape that fits in a plane area in the plane is defined by the outer periphery of the cartridge, the dimensions
With spindle motor, laser unit, and focusing lens
The carriage base holding the slider and the actuator means to at least three slide shafts by the urging means.
The optical disk unit and the spindle motor unit are connected by parallel movement along the optical disk, and the optical system unit (consisting of a laser unit, a condenser lens, and actuator means) serving as a reference for signal detection and the spindle motor unit are mounted on the carriage base. It will be integrated. 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 which emits a laser and a photodetector which generates a current by receiving light is provided on a movable base 5, and a laser unit is provided. 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 disk 1. , 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 relative to the movable base 5 in the focus direction (arrow F).
(In the direction indicated by). The actuator means for driving the condenser lens 8 in the focusing direction and the tracking direction includes a focus coil 11 wound around the bobbin 9 and a pair of fixed coils fixed to the movable base 5 and opposed to the focus coil 11. , A tracking magnet 13 having a two-pole split magnetized surface,
It is fixed to the carriage base 15. The carriage base 15 is accommodated in a plane defined by the outer periphery of the cartridge 2 as shown in FIGS. 2, 8 and 10 in order to achieve an intended purpose, that is, to eliminate useless space.
Cart that has a round shape and dimensions and is in the position for recording and playback
Ridge 2 and carriage base 15 with respect to disk surface
Carriage base is cartridge when viewed vertically
The carriage base so that it is almost entirely contained within the outer circumference of the carriage.
And the cartridge 15 are arranged . The parts 13a, 1 of the tracking coil 13
A pair of back yokes 14 made of a ferromagnetic material are arranged in 3b, and each of the back yokes 14 faces only one of the divided surfaces of the tracking magnet 16 in the moving range of the movable base 5. A spindle motor for rotating the optical disk 1 is provided with a bearing 18 fixed on the carriage base 15.
A spindle coil 19 disposed around a bearing 18 and fixed to the carriage base 15; a turntable 20 for holding the optical disk 1 fitted to the bearing 18 and rotatably supported; It comprises a spindle magnet 21 opposed to the spindle coil 19 and fixed to a turntable 20. A slide shaft 23 erected on a device base 22 which is a part of the housing of the optical disk device is fitted with a slide bearing of the carriage base 15 so that the carriage base 15 can slide with respect to the device base 22. Have been. A slide spring 24 disposed on the axis of the slide shaft 23 urges the carriage base 15 in the direction indicated by the arrow G. A slide plate 25 that slides on the device base 22 is urged by a slide plate spring 26 in a direction indicated by an arrow H, and the slide plate 25 contacts a guide pin 27 provided on the carriage base 15 by a slide spring 24. In contact. A cartridge detection lever 30 rotatably attached to a pin 29 provided on the device base 22 is disposed on the slide plate 25 and is engaged with a trigger pin 28. 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 a single substrate 33 (shaded portion in FIG. 3). Have been. In the drawing, reference numeral 17 denotes a shaft for sliding the movable base 5 and the carriage base 15, 31 a lever spring for urging the cartridge detection lever 30, and 32 a control having a circuit fixed to the apparatus base 22. A substrate 34 is an insertion opening of the cartridge 2 formed in the housing. The optical disk 1 is rotatably housed and held in a cartridge 2 and is provided with a shutter 3. In general, the shutter 3 is in a closed state as shown in FIG. It is in. When recording information is recorded / reproduced on the optical disk 1, the shutter 3 is opened and openings 2a and 2b are formed on the upper and lower surfaces of the cartridge 2, as shown in FIG. In this embodiment, the cartridge 2 has openings 2a and 2b on the upper and lower surfaces. However, if the cartridge 2 has at least one opening for recording and reproducing information on the optical disc 1, the present embodiment is applicable. 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 from the insertion slot 34 of the housing in the direction indicated by the arrow I, the carriage base 15 is moved by the engagement between the slide plate 25 and the guide pins 27. It is located below. When the cartridge 2 is further inserted deeper into the cartridge 2 is in contact with the cartridge detection lever 30 equivalents, the cartridge detection lever 30 is rotated, the cartridge detection by the slide plate spring 26
The trigger pin 28 that has been in contact with the output lever 30 is separated from the cartridge detection lever 30, and the slide plate 25 moves in the direction indicated by the arrow J by the action of the slide plate spring 26. When the slide plate 25 moves, the guide pins 2 7 which has been restrained by the slide plate 25 is released, slide
Move along the slope of the plate 25 (see FIGS. 7 and 9)
Will do. By the action of the slide spring 24, the carriage base 15 has three (see FIGS. 2, 3, and 8).
(See FIG. 7) Along the slide shaft 23 (cartridge)
(Vertical to 2) to the state shown in FIGS. 9 and 10, and the optical disc 1 is fitted to the turntable 20. Thus, the parallelism of the carriage base 15 is maintained.
The holding accuracy is ensured by the three slide shafts 23.
The accuracy of the movement of the carriage base 15 is
And the carriage
The accuracy of the amount of movement of the base 15 is confirmed by the slide plate 25.
Will be preserved. Then, when the spindle coil 19 is energized, the turntable 20 and the optical disc 1 held by the turntable 20 rotate by the electromagnetic action of the spindle magnet 21. The laser beam emitted from the laser unit 4 is guided to the condensing lens 8 by the reflection mirror 7, the electromagnetic action between the focus magnets 12 by energizing the focus coil 11 to operate the converging lens 8 in the focusing direction yo is, it is possible to focus the laser beam to the optical disc board 1 in an optimum state.
Light reflected from the optical disk 1 is guided to a photodetector in the laser unit 4 by the hologram plate 6 via the reflection mirror 7. When the tracking coil 13 is further energized, the movable base 5 can move in the radial direction of the optical disc 1 with respect to the carriage base 15 by the electromagnetic action with the tracking magnet 16. The information on the optical disc 1 can be recorded / reproduced by a combination of the above operations. When ejecting the cartridge 2, when the slide plate 25 is pressed, the carriage base 15 is moved downward by the engagement of the slide plate 25 and the guide pin 27, and the optical disk 1 and the turntable are disengaged. 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 so that the cartridge 2 can be ejected. As described above, according to the present embodiment, the spindle motor for rotating the optical disk 1, the laser unit 4 for emitting and detecting light, and the laser unit 4
The carriage base 15 holding the condenser lens 8 for condensing the laser light from the optical disc 1 on the optical disk 1 and the actuator means for driving the condenser lens 8 in the focusing and tracking directions is moved toward and away from the cartridge 2. By moving the carriage base 15 whose area in the plane is much smaller than that of the cartridge 2, the optical disk 1 and the spindle motor are connected to each other. An optical system (comprised of a laser unit 4, a condenser lens 8, and an actuator) serving as a reference for signal detection and a spindle motor unit are integrally formed on the carriage base 15. Reading due to mechanical vibration or positional accuracy of the optical system It is possible to reduce the deterioration of the performance. The electrical 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, so that the assembling property and noise resistance are reduced. Is excellent. Further, the present invention is not limited to the structure of the actuator means shown in the present embodiment, and the focus driving means and the tracking driving means are formed as the actuator means of the condenser lens 8 using the same magnetic circuit. May be
The component configuration and layout of the optical system are not limited to the configuration shown in this embodiment. As is apparent from the above description, the present invention provides a spindle motor for rotating a recording medium and a laser.
A laser unit for the laser light emitted and detected, the Le
And condensed to condensing lens to a recording medium the laser light emitted from Zayunitto, and actuator means for causing driving the condenser lens in the focusing direction and the tracking direction, yield in the plane defined by the outer periphery of said cartridge
It has a round shape and dimensions, and the spindle motor part and the
Laser unit, the condenser lens, and the actuator
A carriage base for holding the unit, is inserted into the carriage base, movably supported parallel to and away direction with respect to the carriage base the cart <br/> ridge, calibration
Has at least three slide <br/> id shaft disposed around the ridge base, and drive means for moving in a direction to approach the carriage base to the Katori <br/> Tsu di recording
Attach the cartridge and carriage base
When viewed perpendicular to the disc surface, the carriage
So that almost all of the
Arranging the carriage base and the cartridge,
The driving unit includes an urging unit and an insertion of the cartridge.
Slope where the distance to the cartridge changes according to the amount
And move by insertion of the cartridge.
A sliding member for restraining the pressing biasing force of the biasing means.
And a force caused by the release of the urging force.
The amount of movement that the ridge base approaches the cartridge is
The slide member is restrained by the slope portion,
The carriage base operates by inserting a cartridge.
The cartridge close to the cartridge ,
It is possible to realize a highly reliable and excellent optical disk apparatus in which useless space is eliminated and signal reading performance is not deteriorated due to vibration caused by mechanical backlash or positional accuracy of an optical system.

BRIEF DESCRIPTION OF THE 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 a main part of FIG. 1; FIG. FIG. 5 (a) is a plan view of the cartridge of the optical disc apparatus with the shutter closed, FIG. 5 (b) is a bottom view of FIG. 3 (a), and FIG. 6 (a) is the same optical disc. FIG. 7B is a bottom view of FIG. 7A in a state where the shutter of the cartridge of the apparatus is opened. FIG. 7 is a schematic cross-sectional view showing a state of the optical disc apparatus when the cartridge is started to be mounted. FIG. 9 is a schematic cross-sectional view showing a state of the optical disk device at the end of mounting the cartridge. FIG. 10 is a plan view of a main part in FIG. 9; FIG. 11 is a schematic cross-sectional view of a conventional optical disk device. ) Indicates when the cartridge of the same optical disc device starts to be mounted. (B) is a schematic cross-sectional view showing the state of the optical disk device at the end of mounting the cartridge. (FIG. 13) is a schematic cross-sectional view of another conventional optical disk device. (FIG. 14) (a) is a sectional view of the optical disk device. A schematic sectional view (b) showing a state at the time of starting the mounting of the cartridge is a schematic sectional view showing a state at the time of completing the mounting of the cartridge of the optical disk apparatus. 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 section) 19 Spindle coil (spindle motor section) 20 Turntable Le (spindle motor unit) 21 spindle magnet (spindle motor)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-36296 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 7/085 G11B 17/04 413 G11B 25 / 04 101

Claims (1)

(57) [Claim 1] An optical disk device for reproducing data or recording / reproducing data with the recording medium through an opening formed in a cartridge in which the recording medium is rotatably stored and held therein. A spindle motor unit that rotates the recording medium, a laser unit that emits laser light, and also detects, and a condenser lens that condenses the laser light emitted from the laser unit on the recording medium, Actuator means for driving the condenser lens in a focus direction and a tracking direction, having a shape and dimensions that fit within a plane defined by the outer periphery of the cartridge, the spindle motor unit, the laser unit, and the condenser lens A carriage base for holding the actuator means; and Movably supported parallel to and away direction with respect to the cartridge Jjibesu, arranged around the carriage base
At least three slide shafts and driving means for moving the carriage base in a direction approaching the cartridge are provided, and the cartridge and the carriage base located at the time of recording and reproduction are viewed in a direction perpendicular to the disk surface. Sometimes, the carriage base and the cartridge are arranged such that the carriage base is substantially entirely contained in the outer periphery of the cartridge, and the driving means includes an urging means,
The distance between the cartridge and the cartridge
When the cartridge is inserted,
To move and restrain the urging force of the urging means.
Having a sliding member that releases the pressing urging force.
The carriage base contacts the cartridge.
The amount of movement approaching depends on the slope of the slide member.
An optical disk device, wherein the optical disk device is constrained and operated by inserting the cartridge to move the carriage base close to the cartridge.