JPH10302416A - Optical disk device and its assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance working efficiency of assemblage without increasing manufacturing cost. SOLUTION: A plate-like center yoke 26a to be included in a linear motor has a notched part 26d on its side opposite to a guide shaft 71 arranged in parallel. This center yoke 26a and the guide shaft 71 are simultaneously fixed up by a single fixing screw 91. This fixing screw 91 is fitted between the center yoke 26a and the guide shaft 71 in order to come in contact with the notched part 26d.

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, and more particularly to an optical disk for recording data on both spiral land tracks and groove tracks formed on the optical disk and reproducing the data recorded on the optical disk. The present invention relates to a recording / reproducing apparatus and a recording / reproducing method applied to the optical disc recording / reproducing apparatus.

[0002]

2. Description of the Related Art In addition to an optical disc capable of recording data on only one of a land track and a groove track, an optical disc capable of recording data on both a land track and a groove track,
Alternatively, there are a reproduction-only type in which data other than data recorded at the time of manufacture cannot be additionally recorded, and a type in which data can be additionally recorded. These optical disks have an identification data area in the vicinity of the innermost circumference where identification data for identifying the type of the optical disk is recorded.

On the other hand, an optical disk recording / reproducing apparatus (hereinafter referred to as an optical disk apparatus) capable of recording data on such a plurality of types of optical disks and reproducing the recorded data has been put into practical use. I have.

As shown in FIG. 9, this optical disk device has a spindle motor 223 for rotating the optical disk at a predetermined rotation speed. The optical disk device also includes an optical system for guiding a light beam generated by a light source to the optical disk, and an objective lens 23 for focusing the light beam.
It has an optical head 225 equipped with a 0 or the like.

[0005] The optical head 225 is movably supported by two guide shafts 271 arranged in parallel with each other along the radial direction of the optical disk. In order to move the optical head 225 along the guide shaft 271, a linear motor 226 is provided in parallel with the guide shaft 271.

[0006] The linear motor 226 is
25, a center yoke 226a passing through the coil 227, and a center yoke 2
The back yoke 226b covers the center yoke 226a and the back yoke 226b covers the center yoke 226a.

[0007] The procedure for assembling such an optical disk device is as follows.
First, the optical head is attached to the guide shaft, and the center yoke is inserted into a coil fixed to the optical head. After fixing the guide shaft to the fixed base, the center yoke is arranged at a predetermined position on the fixed base. Then, the back yoke to which the magnet is bonded is attached so as to face the center yoke. Then, the optical disk device is assembled by fixing all of them.

[0008]

However, in such an assembling method, when the back yoke is mounted on the center yoke, the center yoke in which the magnet adhered to the back yoke is only disposed on the fixed base is magnetically attracted. Therefore, the center yoke may jump out of the fixed base and damage the coil.

For this reason, as shown in FIG. 9, after the guide shaft 271 is fixed to the fixed base 280 with the screw 291, the center yoke 2 inserted into the coil 227 is
26a is also temporarily fixed to the fixed base 280 with the screw 292. As described above, by temporarily fixing the center yoke 226a to the fixed base 280 with the screw 292 for temporarily fixing the center yoke 226a, the center yoke 226a is prevented from jumping out of the fixed base 280 when the back yoke 226b is mounted. Then, with the back yoke 226b placed on the center yoke 226a, the back yoke 226b and the center yoke 226a are fixed to the fixed base 280 by screws 293.

As described above, when assembling an optical disk device, it is necessary to screw individual components, and the number of components increases, and the number of assembly steps during manufacturing increases. is there. In addition, there is a problem that it hinders improvement of work efficiency in assembling.

In order to prevent the number of parts from increasing, there is also an assembling method in which the back yoke is mounted with the center yoke temporarily fixed using a jig. However, since the operation of the jig is complicated, the above-described method is used. Similarly, there is a problem that it is difficult to improve work efficiency.

An object of the present invention has been made in view of the above-mentioned circumstances, and an optical disk device capable of improving the working efficiency at the time of assembling without increasing the manufacturing cost, and an optical disk device of the present invention. An object of the present invention is to provide an assembling method.

[0013]

SUMMARY OF THE INVENTION The present invention has been made based on the above problem, and according to the first aspect of the present invention, a light beam from a light source is focused on an optical disc and irradiated. An optical head, extending along the radial direction of the optical disc, and supporting means for supporting the optical head movably in the radial direction of the optical disc; and a supporting means provided in parallel with the supporting means. An optical disc device, comprising: driving means for driving the optical head supported by the supporting means in a radial direction of the optical disc; and fixing means for simultaneously fixing the supporting means and the driving means. Provided.

According to the second aspect of the present invention, the optical head for converging and irradiating the optical disk with the light beam from the light source, and the optical head is formed so as to extend in one direction. Supporting means for movably supporting the optical head, driving means for driving the optical head supported by the supporting means in the extending direction, and the extending direction being parallel to the radial direction of the optical disk. A first positioning section for positioning the support means, a second positioning section for positioning the drive means so as to be parallel to the support means, the support means positioned on the first positioning section, (2) An optical disk device comprising: a fixing unit for simultaneously fixing the driving unit positioned at the positioning unit.

According to the third aspect of the present invention, the optical head for converging and irradiating the optical disk with the light beam from the light source is formed so as to extend in one direction. Supporting means for movably supporting the optical head, driving means for driving the optical head supported by the supporting means in the extending direction, and the extending direction being parallel to the radial direction of the optical disk. A base portion having a first positioning portion for positioning the support means, a second positioning portion for positioning the driving means so as to be parallel to the support means, and the base portion positioned at the first positioning portion. An optical disc device, comprising: a support unit; and a fixing unit that simultaneously fixes the driving unit positioned at the second positioning unit to the base unit. That.

According to the fourth aspect of the present invention, an optical head having an objective lens for converging a light beam from a light source on an optical disk, and an optical head formed so as to extend in one direction, and A guide shaft movably supporting the optical head in a direction, a coil fixed to the optical head, a coil penetrating the center of the coil, arranged in parallel with the guide shaft, and facing the guide shaft. A plate-shaped center yoke having a notch formed on the side thereof, and a back yoke having a magnet covering the center yoke, and driving the optical head supported by the guide shaft in the extending direction. And a fixed means arranged between the notch and the guide shaft for simultaneously fixing the center yoke and the guide shaft. Optical disc apparatus is provided, characterized in that it comprises a means.

According to the fifth aspect of the present invention, the optical head provided with the objective lens for converging the light beam from the light source to the optical disk, and the optical head is formed so as to extend in one direction. A guide shaft movably supporting the optical head in a direction, a coil fixed to the optical head, a coil penetrating the center of the coil, arranged in parallel with the guide shaft, and facing the guide shaft. A plate-shaped center yoke having a notch formed on the side thereof, and a back yoke having a magnet covering the center yoke, and driving the optical head supported by the guide shaft in the extending direction. A driving unit for positioning the guide shaft so that the extending direction is parallel to a radial direction of the optical disc; A base portion having a second positioning portion that positions the ter yoke parallel to the guide shaft; the guide shaft positioned at the first positioning portion; and the center positioned at the second positioning portion. An optical disc device is provided, comprising: fixing means disposed between the notch portion of the yoke and fixing the center yoke and the guide shaft simultaneously.

According to the sixth aspect of the present invention, a header data area having a spiral land track and a groove track formed by a land portion and a groove portion, in which header data is recorded, and user data are recorded. An optical disk device that records data on an optical disk in which a format including a user data area is defined, and reproduces data recorded on the optical disk, emits a light beam from a light source to a data recording surface of the optical disk. An optical head for converging and irradiating, and a support means extending along the radial direction of the optical disc and supporting means for supporting the optical head movably in the radial direction of the optical disc; and a support means provided in parallel with the support means. And the optical head supported by the support means is an optical disc. Driving means for driving in the radial direction of the optical disc, fixing means for simultaneously fixing the supporting means and the driving means, and controlling the light source based on the recording data to be recorded to thereby record the recording data on the data recording surface of the optical disc. Data recording means for generating a light beam corresponding to
Data reproducing means for controlling a light source to generate a light beam for irradiating a data recording surface of the optical disc, and reproducing data recorded on the data recording surface based on a reflected beam from the data recording surface; An optical disk device characterized by comprising:

According to the seventh aspect of the present invention, an optical head for converging and irradiating a light beam from a light source onto an optical disk, and is formed so as to extend in one direction, and extends in this extending direction. An assembling method for an optical disk device, comprising: a support unit that movably supports the optical head; and a driving unit that drives the optical head supported by the support unit in the extending direction. Is positioned so as to be parallel to the radial direction of the optical disk, the driving means is positioned so as to be parallel to the supporting means, and the positioned supporting means and the driving means are simultaneously placed on the base portion. An optical disk device assembling method characterized by being fixed is provided.

According to the eighth aspect of the present invention, an optical head having an objective lens for converging a light beam from a light source onto an optical disk, and an optical head formed so as to extend in one direction, and A guide shaft movably supporting the optical head in a direction, a coil fixed to the optical head, a coil penetrating the center of the coil, arranged in parallel with the guide shaft, and facing the guide shaft. A plate-shaped center yoke having a notch formed on the side thereof, and a back yoke having a magnet covering the center yoke, and driving the optical head supported by the guide shaft in the extending direction. And an assembling method of an optical disk device comprising:
The guide shaft supports the optical head, the center yoke penetrates the center of the coil, the center yoke and the guide shaft are arranged in parallel, a cutout portion of the center yoke, the guide shaft, The center yoke and the guide shaft are simultaneously fixed to the base portion by screwing the space between them, thereby providing a method for assembling an optical disk device.

According to the ninth aspect of the present invention, an optical head having an objective lens for converging a light beam from a light source on an optical disk, and an optical head formed so as to extend in one direction. A guide shaft movably supporting the optical head in a direction, a coil fixed to the optical head, a coil penetrating the center of the coil, arranged in parallel with the guide shaft, and facing the guide shaft. A plate-shaped center yoke having a notch formed on the side thereof, and a back yoke having a magnet covering the center yoke, and driving the optical head supported by the guide shaft in the extending direction. And an assembling method of an optical disk device comprising:
The guide shaft supports the optical head, the center yoke penetrates the center of the coil, and positions the guide shaft so that the extending direction is parallel to the radial direction of the optical disc. An optical disk, wherein the center yoke and the guide shaft are simultaneously fixed by positioning the guide yoke so as to be parallel to the guide shaft and screwing a gap between the notch of the center yoke and the guide shaft. An apparatus assembly method is provided.

According to the optical disk apparatus and the optical disk assembling method of the present invention, when the driving means is mounted on the base portion, the guide shaft functioning as the supporting means and the center yoke included in the linear motor functioning as the driving means are used as the base. The parts are simultaneously fixed to predetermined positioning positions by screws functioning as fixing means. At this time, the guide shaft is securely fixed to the base portion, but the center yoke need only be fixed with at least a temporary holding force. Thus, when the back yoke provided with the permanent magnet included in the linear motor is brought close to the center yoke, it is possible to prevent the center yoke from rising out of the base portion.

Further, a notch is formed on the guide shaft side of the center yoke, and by attaching a screw to this notch, the contact area between the screw and the center yoke is increased, so that the center yoke is more effectively formed. Floating can be prevented.

Therefore, since a single screw has a function of fixing the guide shaft and at least temporarily fixing the center yoke, a screw for fixing the guide shaft and a screw for fixing the center yoke are provided. It is not necessary to prepare them individually, and the number of parts can be reduced, and the number of working steps can be reduced. For this reason, it is possible to reduce the manufacturing cost of the optical disk device.

Further, since it is possible to prevent the center yoke from being lifted when the back yoke is mounted, it is not necessary to break parts such as the drive coil during the assembling work or to use a jig for temporary holding. For this reason, the work efficiency when assembling the optical disk device can be improved.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical disk device according to the present invention and a method for assembling the optical disk device will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of an optical disk device according to an embodiment of the present invention. This optical disc device irradiates a converging light beam to the optical disc 1 to record data or reproduce data recorded on the optical disc 1.

The optical disc 1 is formed by coating a metal film layer such as tellurium or bismuth in a donut shape on the surface of a substrate formed in a circle of, for example, glass or plastics. Also,
The optical disc 1 has a data recording surface composed of concentric or spiral grooves (concave portions) and lands (convex portions), and data is recorded on both the grooves and the lands, and is recorded on these. The data is played.

This optical disc 1 has a lead-in area 2, a data area 3, a lead-out area 4, etc., as shown in FIGS. Lead-in area 2
Is an emboss data zone 5 consisting of a plurality of tracks
And a rewritable data zone 6 composed of a plurality of tracks. In the emboss data zone 5, reference signals and control data are recorded at the time of manufacturing. The rewritable data zone 6 includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, and a replacement management zone as a replacement management area.

The data area 3 includes a plurality of, for example, 24 zones 3 formed by a plurality of tracks in the radial direction.
.. 3x. The lead-out area 4 is a rewritable data zone composed of a plurality of tracks and similar to the rewritable data zone 6 formed in the lead-in area 2. The lead-out zone 4 can record data having the same recording content as the data zone 6.

As shown in FIGS. 2 and 3, the optical disc 1 has a lead-in area 2 having an embossed data zone 5 and a rewritable data zone 6, and a data area 3 having zones 3a,. , And a data zone of the lead-out area 4 are formed.

As shown in FIG. 4, in the optical disk 1, the clock signal for each zone is the same, and the number of rotations of the optical disk 1 for each zone, that is, the rotation speed, the number of sectors for each track, and the like. Are different from each other.

That is, the zone 3a of the data area 3,
.. 3x, the rotation speed decreases as the optical disk 1 moves from the inner circumference to the outer circumference, and the number of sectors per track increases. Each of the zones 3a,... 3x,
The relationship between the rotation speed data and the number of sectors in one track for the data 4, 5, and 6 is shown in Table 1 of the memory 10 described later.
0a.

The zones 3a,... 3x of the data area 3
As shown in FIGS. 2 and 3, an ECC (error correction code) as a data recording unit
Data is recorded in advance for each block data unit (for example, 38688 bytes). As shown in FIG. 2, in the tracks of the zones 3a,... 3x of the data area 3, a header field 11 in which header data such as an address is recorded for each sector is pre-formatted in advance.

Here, the description returns to FIG. As shown in FIG. 1, the optical disc 1 is loaded on a spindle motor 23 while being held by a cartridge 21. The optical disc 1 is rotated by the spindle motor 23, for example, at a different rotation speed for each zone. The spindle motor 23 includes a motor control circuit 24
Is controlled by

The recording of data on the optical disk 1 or the reproduction of data recorded on the optical disk 1 is performed by the optical head 25. Spindle motor 23
The optical head 25 is provided on a fixed base as described later.

The optical head 25 is fixed to a drive coil 27 which constitutes a movable portion of a linear motor 26 as drive means, and the drive coil 27 is connected to a linear motor control circuit 28.

On the other hand, as shown in FIG. 1, a speed detector 29 is connected to a linear motor control circuit 28 for driving the linear motor 26, and the speed signal of the optical head 25 detected by the speed detector 29 is detected. Is the linear motor control circuit 2
8 to control the moving speed of the optical head 25.

The carriage 70 of the optical head 25 is provided with an objective lens 30 as shown in FIG. 1, and is supported by a wire or a leaf spring (not shown).
The objective lens 30 is moved in the focusing direction (the optical axis direction of the lens) by the drive coil 31 and is moved in the tracking direction (the direction orthogonal to the optical axis of the lens) by the drive coil 32.

The semiconductor laser 39 is driven by a laser drive circuit 35 to generate a laser beam. The laser drive circuit 35 corrects the light amount of the laser beam generated by the semiconductor laser 39 according to the monitor current from the photodiode PD for monitoring the semiconductor laser 39.

The laser drive circuit 35 includes a PLL (not shown).
It operates in synchronization with a clock signal for data recording or data reproduction from a circuit. This PLL circuit divides the frequency of a basic clock signal from an oscillator (not shown) to generate a clock signal for data recording or data reproduction. In the laser drive circuit 35, the semiconductor laser 3
When a laser beam for data recording is generated from step 9, control is performed so as to generate a high-output laser beam higher than the laser beam for data reproduction by a predetermined level.

The laser beam generated by the semiconductor laser 39 driven by the laser drive circuit 35 is collimated by a collimator lens 40, and the optical path is bent by a half prism 41 at a substantially right angle.
That is, the semiconductor laser 39 is formed by the half prism 41.
Is emitted toward the optical disc 1 in a collimated state. This laser beam is focused on the data recording surface of the optical disc 1 by the objective lens 30.

The light beam reflected from the data recording surface of the optical disc 1 passes through the objective lens 30 and the half prism 41, and is guided to the photodetector 44 via the condenser lens 42 and the cylindrical lens 43. I will

The photodetector 44 is composed of, for example, four divided photodetection cells 44a, 44b, 44c and 44d. The light detection cell 44 included in the light detector 44
The output signal a is supplied to one end of an adder 46a via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied to one end of the adder 46b via an amplifier 45b. The output signal of the light detection cell 44c is supplied to the other end of the adder 46a via the amplifier 45c.
Is supplied to the other end of the adder 46b via the amplifier 45d.

The output signal of the photodetector cell 44a included in the photodetector 44 is supplied to one end of an adder 46c via an amplifier 45a, and the output signal of the photodetector cell 44b is supplied via an amplifier 45b. It is supplied to one end of the adder 46d. The output signal of the light detection cell 44c is
The output signal of the photodetector cell 44d is supplied to the other end of the adder 46d via the amplifier 45d via the amplifier 45d.
6c is supplied to the other end.

The output signal of the adder 46a is a differential amplifier O
The output signal of the adder 46b is supplied to a non-inverting input terminal of the differential amplifier OP2. Thus, the differential amplifier OP2 includes the adder 46a,
A signal relating to the focus point, that is, a focus error signal is supplied to the focusing control circuit 47 in accordance with the difference 46b. The output signal from the focusing control circuit 47 is supplied to the drive coil 31, and is controlled so that the laser beam is always just focused on the data recording surface of the optical disc 1.

The output signal of the adder 46c is a differential amplifier O
The output signal of the adder 46d is supplied to the non-inverting input terminal of the differential amplifier OP1. As a result, the differential amplifier OP1 includes the adder 46c,
A tracking error signal is supplied to the tracking control circuit 48 according to the difference of 46d. Tracking control circuit 48
Creates a track drive signal according to the tracking error signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 48 is supplied to the drive coil 32 in the tracking direction. The tracking error signal used in the tracking control circuit 48 is also supplied to the linear motor control circuit 28.

In the state where the focusing control and the tracking control are performed as described above, the sum signal of the outputs of the photodetection cells 44a to 44d of the photodetector 44, that is, the adder 4
The signal obtained by adding the output signals from 6c and 46d by the adder 46e reflects a pit formed on the track, that is, a change in reflectance from the recording data. This signal is supplied to a data reproducing circuit 38, which reproduces data recorded on the data recording surface of the optical disk.

The reproduction data reproduced by the data reproduction circuit 38 is subjected to error correction by an error correction circuit 52 using the applied error correction code ECC, and then an optical disk as an external device is transmitted via an interface circuit 55. Output to control device 56.

A data generation circuit 34 is provided at a stage preceding the laser drive circuit 35. The data generation circuit 34 receives the format data of the ECC block as the recording data supplied from the error correction circuit 52,
Recording EC with synchronization code for ECC block
An ECC block data generation circuit 34a that converts the data into C block format data, and a modulation circuit 34b that modulates the recording data from the ECC block data generation circuit 34a using the 8-16 code conversion method.

The data generation circuit 34 is supplied with recording data to which an error correction code has been added by the error correction circuit 52 and dummy data for error checking read from the memory 10. To the error correction circuit 52, recording data from an optical disk control device 56 as an external device is supplied via an interface circuit 55 and a bus 49.

The error correction circuit 52 converts the 32 Kbytes of recording data supplied from the optical disc control device 56 into 4K bytes.
Each of the horizontal and vertical error correction codes (ECC1, ECC1) for the recording data in the sector unit for each byte.
2) and a sector ID (logical address number) to generate ECC block format data.

The optical disk device has a focusing control circuit 47 and a tracking control circuit 4 respectively.
8, and a D / A converter 51 used to exchange information between the linear motor control circuit 28 and the CPU 50 that controls the entire optical disk device.

Motor control circuit 24, linear motor control circuit 28, laser drive circuit 35, data reproduction circuit 38, focusing control circuit 47, tracking control circuit 4
8. The error correction circuit 53 and the like are connected to the CPU via the bus 49.
50. The CPU 50 has a memory 1
A predetermined operation is performed by the control program recorded in “0”.

The memory 10 stores a control program and is used for data recording. This memory 10
Has a table 10a in which the relationship between the speed data (the number of rotations) and the number of sectors in one track is recorded for each of the zones 3a, ..., 3x, 4, 5, and 6.

FIG. 5 is a perspective view showing the structure of the optical head 25 and the linear motor 26 shown in FIG. As shown in FIG. 5, the spindle motor 23, the optical head 25, the linear motor, and the like are provided in a housing formed of, for example, aluminum die-casting, that is, a fixed base 80.

The linear motor 26 is a plate-shaped center yoke 26 arranged in parallel along the radial direction of the optical disk.
a, a back yoke 26b provided to cover the center yoke 26a, and a permanent magnet 2 provided to the back yoke 26b so as to face the center yoke 26a.
6c and a drive coil 27 wound around a center yoke 26a and movably provided.

That is, the center yoke is inserted through the center of the drive coil 27. The drive coil 27 is connected to a linear motor control circuit 28, and the supplied current value is controlled. The drive coil 27 is excited by a current flowing from the linear motor control circuit 28 in a predetermined direction, so that the permanent magnet 26c
Propulsion is generated by interaction with a magnetic field formed so as to penetrate the center yoke 26a. The drive coil 27 uses the propulsive force to drive the center yoke 26a
, That is, in the radial direction of the optical disk.
The moving speed is determined by a current value supplied to the coil.

The center yoke 26a of the linear motor 26
Are parallel to the guide shaft 71 as two cylindrical support means extending in the radial direction of the optical disc 1.
Are arranged in parallel.

The guide shaft 71 and the linear motor 2
The six center yokes 26b are fixed in a predetermined position on the fixed base 80 by a single fixing screw 91 as fixing means in a state of being parallel and parallel to each other. At this time,
It is sufficient that the center yoke 26b is at least temporarily fixed to the fixed base 80. That is, it is sufficient that the center yoke 26b is fixed so as not to protrude from the fixed base 80 to the outside. And the center yoke 26
b, the center yoke 26b and the back yoke 26c are fixed with the fixing screws 9a.
2 fixed to the fixed base 80.

The carriage 70 functioning as the main body of the optical head 25 is fixed to the drive coil 27. The optical head 25 has two guide shafts 71.
And movably supported by the center yoke 26a via the drive coil 27. As described above, the optical head is moved in the radial direction of the optical disk by using the propulsive force generated by the interaction between the magnetic field formed by the drive coil 27 and the magnetic field penetrating the center of the drive coil 27. .

The carriage 70 has a guide shaft 71 for assisting movement on the guide shaft 71.
And a rotatably provided roller 72 that rotates with the movement of the carriage 70 while contacting the roller 72.

FIG. 6 is an exploded view showing the structure of the optical disk device shown in FIG. With reference to FIG. 6, a method of assembling the optical disk device will be described. First, the optical head 25
The guide shaft 71 is inserted into the carriage 70, and the center yoke 26a is inserted through the center of the drive coil 27 fixed to the carriage 70.

Then, as described later, in this state, the fixed base 80 is arranged at a predetermined positioning position. Subsequently, both the guide shaft 71 and the center yoke 26a are fixed to the fixed base 8 by the fixing screws 91 with flat washers.
Fixed to 0. At this time, the guide shaft 71 is fixed to the fixed base 80 by the flat washer of the fixing screw 91, but the center yoke 26a may be at least temporarily fixed to the fixed base 80.

As shown in FIG. 6, the center yoke 26a
A cutout portion 26d is formed at a position facing the guide shaft 71 and not disturbing the movement of the drive coil 27. This notch 26d is
The fixing screw 91 is formed to have a sufficient size to be inserted between the guide shaft 71 and the center yoke 26a. Further, the fixing screw 9 is inserted up to the notch 26d.
By inserting 1, the contact area between the flat washer and the center yoke 26 a is increased, and the protrusion of the center yoke 26 a can be suppressed more effectively.

FIG. 7 is a plan view showing a state where the guide shaft 71 and the center yoke 26a are fixed by the fixing screws 91. As shown in FIG. 7, the fixing screw 91 is inserted between the notch 26d of the center yoke 26a and the guide shaft 71 so as to contact the notch 26d.
The contact area between the flat washer and the center yoke 26a is increased, so that the center yoke 26a can be effectively prevented from floating.

FIGS. 8A and 8B are cross-sectional views showing how the guide shaft 71 and the center yoke 26a are fixed by the fixing screws 91. FIG. As shown in FIG. 8A, the guide shaft 71 is positioned at a predetermined position 81 of the fixed base 80, that is, a predetermined positioning position 81 having an L-shaped cross section. At this time, the guide shaft 71 having a circular cross section can be positioned by being supported at at least two points of the positioning position 81.

Then, the plate-shaped center yoke 26 a is positioned at a predetermined positioning position 82 of the fixed base 80. Then, the fixing screw 91 is attached while being in contact with the notch of the center yoke 26 a, so that the flat washer 91 a of the screw 91 fixes the guide shaft 71 to the positioning position 81 of the fixed base 80 so as to be fixed. At this time, the center yoke 26a is also fixed to the positioning position 82 of the fixed base 80 by the fixing screw 91 at the same time. That is, the fixing screw 91 has a function of fixing the guide shaft 71 to the fixing base 80 and a function of at least temporarily fixing the center yoke 26a.

The fixing screw 91 is provided with the guide shaft 71 and the center yoke 26 to achieve such a function.
The positional relationship with “a” is defined. That is, as shown in FIG. 8B, the end 91b of the flat washer 91a of the fixing screw 91 is brought into contact with the center of the guide shaft 71 when it comes into contact with the guide shaft 71.
Is desirably within the range E1 defined by the end face on the side of the center yoke 26a.

Further, the flat washer 91a of the fixing screw 91 is used.
Is desirably within a range E2 defined by the upper surface and the center of the guide shaft 71. When the fixing screw 91 is attached to the fixing base 80, the flat washer 91a is brought into contact with the guide shaft 71 to such an extent that a gap of an interval E3 is formed between the lower surface of the flat washer 91a and the upper surface of the center yoke 26a. By doing so, the flat washer 9
1a generates a force in a direction shown by an arrow A in the figure with respect to the guide shaft 71, and fixes the guide shaft 71 so as to press it against the positioning portion 81. Thereby, the guide shaft 71 is reliably positioned and fixed.

That is, although the fixing screw 91 positively fixes the guide shaft 71, the fixing screw 91 may be temporarily fixed to the center yoke 26a so that the gap E3 is formed even if a little. At this time, as described with reference to FIG. 7, the fixing screw 91 is attached while being in contact with the notch 26d of the center yoke 26a, so that the flat washer 91a is formed.
Hold down the center yoke 26a. Therefore, when the permanent magnet 26c provided on the back yoke 26b approaches the center yoke 26a, it is possible to prevent the center yoke 26a from being lifted by magnetic attraction.

Note that the center yoke 26a does not need to be provided with the notch 26d if a slight lifting is allowed. The fixing screw used here may have a flat washer, or may have a washer integrated with the screw.

Then, in this way, the center yoke 2
After the 6a and the guide shaft 71 are fixed to the fixed base 80, as shown in FIG. 6, the back yoke 26b to which the permanent magnet 26c is adhered is placed on the center yoke 26a. At this time, the permanent magnet 26c is
A back yoke 26b is arranged so as to face 6a.

At this time, since the center yoke 26a is at least temporarily fixed by the fixing screw 91, even if the permanent magnet 26c is brought close to the center yoke 26a, it is attracted by the magnetic force of the permanent magnet 26c and the center yoke 2a is pulled.
6a can be prevented from jumping out of the fixed base 80.

Finally, the back yoke 26b is fixed to the fixed base 80 together with the center yoke 26a by the fixing screws 92. As a result, at least the temporarily fixed center yoke 26a is fixed to the fixed base 80.
Fixed to

As described above, according to the optical disk device of the present invention and the method of assembling the optical disk device applied to the optical disk device, when the linear motor is mounted on the fixed base, the guide shaft and the center yoke of the linear motor are connected. The fixed base is simultaneously fixed to a predetermined positioning position by a single screw. Thus, when the back yoke provided with the permanent magnet is brought close to the center yoke, it is possible to prevent the center yoke from rising so much that it protrudes from the fixed base. That is, the center yoke does not rise so far as to deviate from the positioning position.

The positional relationship between the center yoke and the guide shaft with respect to the screw at this time is as follows. First, the height of the upper surface of the center yoke is set at least in the range between the center of the guide shaft and the upper end of the guide shaft. Have been.

Second, the end of the screw is set at least in a range between the center of the guide shaft and the end surface of the guide shaft on the screw side. Further, when the screw comes into contact with the guide shaft, the guide shaft is fixed to the extent that a gap is formed between the screw and the upper surface of the center yoke, and the center yoke is suppressed.

With such a positional relationship, a force for pressing the screw against the positioning portion of the fixed base is generated, and the screw is securely fixed. In addition, the center yoke can be prevented from rising.

Further, a notch is formed on the guide shaft side of the center yoke, and by attaching a screw to this notch, the contact area between the screw and the center yoke is increased, and the center yoke is more effectively formed. Floating can be prevented.

Therefore, since a single screw has a function of fixing the guide shaft and at least temporarily fixing the center yoke, a screw for fixing the guide shaft and a screw for fixing the center yoke are provided. It is not necessary to prepare them individually, and the number of parts can be reduced, and the number of working steps can be reduced. For this reason, it is possible to reduce the manufacturing cost of the optical disk device.

Further, since the center yoke can be prevented from rising when the back yoke is mounted, it is not necessary to break parts such as the drive coil during the assembling work or to use a jig for temporary holding. For this reason, the work efficiency when assembling the optical disk device can be improved.

[0083]

As described above in detail, according to the present invention, it is possible to provide an optical disk device which can improve the working efficiency at the time of assembling without increasing the manufacturing cost, and a method of assembling the optical disk device. it can.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing a configuration of an optical disk applied to the optical disk device shown in FIG.

FIG. 3 is a block diagram schematically showing a configuration of a zone for each area of the optical disc shown in FIG. 2;

FIG. 4 is a diagram for explaining the number of rotations and the number of sectors per track in each zone of the optical disc shown in FIG. 2;

FIG. 5 is a perspective view schematically showing the structures of an optical head and a linear motor in the optical disk device shown in FIG. 1;

FIG. 6 is an exploded view schematically showing the structures of the optical head and the linear motor shown in FIG. 5;

FIG. 7 is a plan view showing a state where the guide shaft and the center yoke are fixed by fixing screws.

FIGS. 8A and 8B are cross-sectional views showing a state in which a guide shaft and a center yoke are fixed by fixing screws.

FIG. 9 is a diagram showing a structure of a conventional optical head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Lead-in area 3 ... Data area 7 ... Discontinuous area 10 ... Memory 23 ... Spindle motor 25 ... Optical head 26 ... Linear motor 26a ... Center yoke 26b ... Back yoke 26c ... Permanent magnet 26d ... Notch 27 ... drive coil 28 ... linear motor control circuit 30 ... objective lens 48 ... tracking control circuit 50 ... CPU 70 ... carriage 71 ... guide shaft 80 ... fixed base 81 ... positioning part 82 ... positioning part 91 ... fixing screw 92 ... fixing screw

Claims (9)

[Claims] An optical head for converging and irradiating a light beam from a light source to an optical disk, and extending along a radial direction of the optical disk, and moving the optical head in a radial direction of the optical disk. Supporting means for freely supporting, driving means provided in parallel with the supporting means and driving the optical head supported by the supporting means in the radial direction of the optical disc; and the supporting means and the driving means An optical disc device, comprising: fixing means for simultaneously fixing the optical discs. 2. An optical head for converging and irradiating a light beam from a light source to an optical disk, and formed so as to extend in one direction and movably supporting the optical head in the extending direction. Supporting means; driving means for driving the optical head supported by the supporting means in the extending direction; and first positioning the supporting means such that the extending direction is parallel to the radial direction of the optical disk. A positioning unit, a second positioning unit that positions the driving unit so as to be parallel to the support unit, and the support unit positioned by the first positioning unit;
An optical disk device, comprising: fixing means for simultaneously fixing the driving means positioned at the second positioning portion. 3. An optical head for converging and irradiating a light beam from a light source to an optical disk, and formed so as to extend in one direction and movably supporting the optical head in the extending direction. Supporting means; driving means for driving the optical head supported by the supporting means in the extending direction; and first positioning the supporting means such that the extending direction is parallel to the radial direction of the optical disk. A base portion having a positioning portion, and a second positioning portion for positioning the driving means so as to be parallel to the support means; and the support means positioned by the first positioning portion;
An optical disk device, comprising: a fixing unit that simultaneously fixes the driving unit positioned at the second positioning unit to the base unit. 4. An optical head having an objective lens for converging a light beam from a light source to an optical disk, and an optical head formed so as to extend in one direction and movably movable in the extending direction. A guide shaft to be supported; a coil fixed to the optical head; and a notch formed on a side facing the guide shaft while being arranged in parallel with the guide shaft through a center of the coil. A drive unit for driving the optical head supported by the guide shaft in the extending direction, the drive unit including: a plate-shaped center yoke; and a back yoke having a magnet covering the center yoke; And a fixing means arranged between the guide shaft and the guide shaft, for fixing the center yoke and the guide shaft simultaneously. Optical disk device. 5. An optical head having an objective lens for converging a light beam from a light source on an optical disk, and an optical head formed so as to extend in one direction and movably movable in the extending direction. A guide shaft to be supported; a coil fixed to the optical head; and a notch formed on a side facing the guide shaft while being arranged in parallel with the guide shaft through a center of the coil. A drive unit for driving the optical head supported by the guide shaft in the extending direction, comprising: a plate-shaped center yoke; and a back yoke provided with a magnet covering the center yoke; A first positioning portion that positions the guide shaft so that the guide yoke is parallel to a radial direction of the optical disc; A base portion having a second positioning portion positioned so as to be parallel to the guide, a guide shaft positioned at the first positioning portion, and a notch in the center yoke positioned at the second positioning portion. An optical disk device, comprising: fixing means disposed between the first and second parts, the fixing means fixing the center yoke and the guide shaft simultaneously. 6. A header data area having a spiral land track and a groove track formed by a land part and a groove part, and in which header data is recorded,
An optical disc device that records data on an optical disc defined in a format including a user data area in which user data is recorded, and reproduces data recorded on the optical disc. An optical head for converging and irradiating the optical beam of the optical disk, supporting means extending along the radial direction of the optical disk, and supporting the optical head movably in the radial direction of the optical disk; Drive means for driving the optical head supported in the support means in parallel with the optical head in the radial direction of the optical disc; fixing means for simultaneously fixing the support means and the drive means; The light source is controlled based on the recording data, and the recording is performed on the data recording surface of the optical disc. A data recording means for generating a light beam corresponding to data, a light source being controlled to generate a light beam for irradiating the data recording surface of the optical disc, and the data recording surface based on a reflected beam from the data recording surface. An optical disc device, comprising: data reproducing means for reproducing data recorded in the optical disk. 7. An optical head for converging and irradiating a light beam from a light source to an optical disk, and formed so as to extend in one direction and movably supporting the optical head in the extending direction. In an assembling method of an optical disk device, comprising: a support unit; and a driving unit that drives the optical head supported by the support unit in the extending direction, wherein the extending direction is parallel to a radial direction of the optical disk. An optical disc device, wherein the support means is positioned in such a manner that the drive means is positioned parallel to the support means, and the positioned support means and the drive means are simultaneously fixed to a base portion. Assembly method. 8. An optical head provided with an objective lens for focusing a light beam from a light source on an optical disk, and formed so as to extend in one direction, and the optical head is movable in the extending direction. A guide shaft to be supported; a coil fixed to the optical head; and a notch formed on a side facing the guide shaft while being arranged in parallel with the guide shaft through a center of the coil. An optical disc including: a plate-shaped center yoke; and a back yoke including a magnet covering the center yoke, and a driving unit for driving the optical head supported by the guide shaft in the extending direction. A method of assembling the device, wherein the guide shaft supports the optical head, the center yoke passes through the center of the coil, The center yoke and the guide shaft are arranged side by side, and the center yoke and the guide shaft are simultaneously fixed to the base portion by screwing between the notch of the center yoke and the guide shaft. A method for assembling an optical disk device, characterized by comprising: 9. An optical head having an objective lens for converging a light beam from a light source to an optical disk, and an optical head formed so as to extend in one direction and movably movable in the extending direction. A guide shaft to be supported; a coil fixed to the optical head; and a notch formed on a side facing the guide shaft while being arranged in parallel with the guide shaft through a center of the coil. An optical disc including: a plate-shaped center yoke; and a back yoke including a magnet covering the center yoke, and a driving unit for driving the optical head supported by the guide shaft in the extending direction. A method of assembling the device, wherein the guide shaft supports the optical head, the center yoke passes through the center of the coil, Positioning the guide shaft so that the extending direction is parallel to the radial direction of the optical disc; positioning the center yoke so as to be parallel to the guide shaft; A method for assembling an optical disk device, wherein the center yoke and the guide shaft are simultaneously fixed by screwing the gap therebetween.