JP2861899B2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for recording information on an optical disk or reading information recorded on the optical disk by irradiating the optical disk with a beam from a laser light source, and more particularly, to an optical pickup device for tilting the optical disk. The present invention relates to an optical pickup device provided with a tilt adjustment unit for adjusting the tilt of the optical pickup main body in accordance with the above and irradiating the optical disk with a beam vertically.

[0002]

2. Description of the Related Art A conventional optical pickup device having a tilt adjusting section will be described below with reference to FIG. FIG. 7 is a perspective view showing a conventional optical pickup device.

In FIG. 1, reference numeral 101 denotes an optical pickup main body, which focuses a beam from a laser light source (not shown) on a recording surface of an optical disk 100 (see FIG. 8) by an objective lens 101a to record or read information. .
The optical pickup main body 101 was mounted on a pickup base 103 via a hinge 102, and was rotatable in a radial direction.

The pickup base 103 is provided with two rails 104a, 104 provided in the radial direction of the optical disc 100.
4b, and is driven in the radial direction of the optical disc 100 by a linear motor including a rod-shaped magnet 105 and an electromagnetic coil 106.

Further, a magnet 107 is vertically provided on the opposite side of the hinge 102 of the optical pickup main body 101, and an electromagnetic coil 108 corresponding to the magnet 107 is provided on the opposite side of the hinge 102 on the pickup base 103. By adjusting the tilt of the optical pickup main body 101 in the radial direction (tilt adjustment), the magnet 107 is attracted or repelled by the coil 108.

Next, the tilt adjusting operation of the conventional optical pickup device having the above configuration will be described with reference to FIGS.
This will be described with reference to (b) and (c). FIG.
(C) is an explanatory diagram of a tilt adjustment operation in the conventional optical pickup device.

FIG. 8A shows a case where the optical disc 100 is in a horizontal state (ideal state). In such a case, the tilt adjustment is not performed and the optical pickup body 10
The beam was irradiated vertically with 1 being in a horizontal state, and the focus P of the beam was focused on the recording surface of the optical disc 100.

FIG. 8B shows a state in which the optical disk 100 is tilted downward to the right due to its own weight or warpage. In such a case, unless the tilt of the optical pickup main body 101 is adjusted in accordance with the tilt of the optical disc 100, the beam emitted from the optical pickup main body 101 is not irradiated perpendicularly to the recording surface of the optical disc 100, and information is recorded or recorded. Unable to read.

Therefore, by supplying a current flowing in one direction to the electromagnetic coil 108 to attract the magnet 107,
Tilt the optical pickup body 101 down to the right,
The beam emitted from the optical pickup main body 101 is irradiated perpendicularly to the recording surface of the optical disc 100.

FIG. 8C shows an optical disk 100.
Indicates a state of being tilted to the left due to its own weight or warpage. In such a case, the current flowing in the opposite direction to that described above is supplied to the electromagnetic coil 108 to cause the magnet 107 to repel, thereby tilting the optical pickup main body 101 to the lower left state and emitting the light from the optical pickup main body 101. The beam was irradiated perpendicularly to the recording surface of the optical disc 100.

Japanese Patent Application Laid-Open No. 4-344329 proposes an optical head tilt adjusting device having a configuration in which the tilt of the optical pickup body is adjusted by a voice coil motor in the same manner as described above.

[0012]

However, the tilt adjusting portion (the hinge 102, the magnet 107, and the electromagnetic coil 108) in the above-described conventional optical pickup device is simply
Optical pickup body 1 according to inclination of optical disc 100
Since the tilt of the optical pickup 101 is adjusted before and after the tilt of the optical pickup main body 101 is adjusted.
There is a problem that the focal position P of the beam irradiated on the recording surface of No. 00 is shifted.

That is, as shown in FIG. 8B, when the optical pickup body 101 is tilted to the lower right,
When the focal position P of the beam applied to the recording surface of the optical disc 100 is shifted to the right, and as shown in FIG. The focal position P of the beam irradiated on the recording surface was shifted to the left.

For this reason, in the conventional optical pickup device, after adjusting the inclination of the optical pickup main body 101, the optical pickup main body 101 is moved in the direction opposite to the inclination of the optical disc 100, and the beam irradiated on the recording surface of the optical disc 100 is adjusted. Of the focal position P of the optical pickup main body 101
It was necessary to return to the position before adjusting the tilt of the camera.
Therefore, there are problems that two steps are required for tilt adjustment and that it takes time to adjust the tilt.

The magnet 107 forming the tilt adjusting section
In addition, there is a problem that the electromagnetic coil 108 is heavy and the magnet 107 and the electromagnetic coil 108 and the optical pickup main body 101 are mounted on a single pickup base 103 and driven by a single linear motor. Therefore, there is also a problem that the optical pickup main body 101 cannot be operated at high speed unless the torque of the linear motor is increased.

Such a problem is caused in Japanese Patent Application Laid-Open No. 4-344329 in which the tilt is adjusted by a voice coil motor and the voice coil motor and the optical pickup main body are mounted on a single pickup base. Also occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables quick tilt adjustment in one step, reduction in the weight of the device, and optical pickup with a small torque. An object of the present invention is to provide an optical pickup device capable of operating a main body at high speed.

[0018]

According to another aspect of the present invention, there is provided an optical pickup device comprising: an optical pickup main body; one or more rails provided in a radial direction of an optical disk; One or two or more bar-shaped magnets provided in parallel with, and a first pickup base provided movably in the radial direction of the optical disk along the rail, and rotatably mounted with the optical pickup body, A first electromagnetic coil movably provided on the rod-shaped magnet, for driving the first pickup base in a radial direction of the optical disk by a magnetic force, and a first electromagnetic coil movably provided in the radial direction of the optical disk along the rail. Two pickup bases, and the rod-shaped magnet is provided so as to be movable, and the second pickup base is moved by a magnetic force to a radius of the optical disc. A second electromagnetic coil for driving the direction,
The first and second pickup bases are provided so as to be connected to each other, and the first pickup base is moved in a direction opposite to the tilt of the optical disc, and is moved between the first pickup base and the second pickup base. When a difference in the amount is generated, based on the difference in the amount of movement,
A tilt adjusting unit for tilting the optical pickup body at the same angle as the optical disc;
Recording information or reading information recorded on the optical disk
The tilt adjustment
The optical pickup main body is connected to the first pickup
Connected to the base, and
A hinge for rotatably holding the optical pick, and the light pick
The inclined portion formed on the back surface of the
Abuts the slope formed on the surface of the base
And a protruding portion .

The optical pickup device according to the second aspect is provided with the optical pickup main body and the optical pickup device in a radial direction of the optical disk.
One or more rails
One or more provided bar-shaped magnets and
Is provided so as to be movable in the radial direction of the optical disk,
First pick-up on which the optical pickup body is rotatably mounted
And a movable base provided on the rod-shaped magnet.
And the first pickup base is moved by the magnetic force to the light.
A first electromagnetic coil driven in the radial direction of the disc;
Moveable in the radial direction of the optical disk along the rail
A second pickup base provided in the rod-shaped magnet
The second pick-up is provided by a magnetic force.
Drive the tape base in the radial direction of the optical disc.
Two electromagnetic coils and the first and second pickup bases
And the first pickup base is connected to the first pickup base.
Move the disk in the direction opposite to the tilt of the
The first pickup base and the second pickup base
When there is a difference in the amount of movement between
Based on the difference, the optical pickup body is
A tilt adjustment unit for tilting the disc at the same angle as the disc,
Recording of information on an optical disc or recorded on said optical disc
Optical pickup device that reads the read information
The tilt adjustment unit moves the optical pickup body forward.
Connected to the first pickup base and the optical pickup
Hinge that holds the backup body rotatably in the radial direction
And formed on the surface of the second pickup base
An inclined portion, formed on the back surface of the optical pickup body
And a projection that abuts the inclined portion .

According to such a configuration, when the optical disk is tilted, moving only the first pickup base in the direction opposite to the inclination of the optical disc, the first pick-up base and between the second pickup base A difference in the amount of movement occurs between the two, and the inclined portion (or the projection) formed on the back surface of the optical pickup main body slides on the projection (or the inclined portion) formed on the second pickup base.

[0021] Thus, the optical pickup main body is inclined at the same angle as the optical disk around the hinge,
A beam from the optical pickup main body is irradiated perpendicularly to a recording surface of the optical disc.

Further , by moving the first pickup base in a direction opposite to the tilt of the optical disc, the focal position of the beam irradiated from the optical pickup main body to the recording surface of the optical disc can be changed. It matches the position before adjusting the tilt.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical pickup device according to the present invention will be described below with reference to the drawings. First, an optical pickup device according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view showing an optical pickup device according to the first embodiment of the present invention. FIG. 2 is a sectional view of the optical pickup device taken along line AA.

The optical pickup apparatus of this embodiment, a hinge for holding the optical pickup main body rotatably first pickup base on the radial direction and inclined portion formed on the back surface of the optical pickup main body, the second pick-up The configuration is provided with a tilt adjustment unit including a projection formed on the base.

In FIG . 1, reference numeral 1 denotes an optical pickup main body, which focuses a beam from a laser light source (not shown) on a recording surface of an optical disk 100 (see FIG. 3) by an objective lens 11 to record or read information. Do. The optical pickup body 1 is mounted on a first pickup base 3 via a hinge 2 and is rotatable in the radial direction about the hinge 2.

The first pickup base 3, two rails 4a provided in the radial direction of the optical disk 100, which is movable along the 4b, by the first electromagnetic coil 6 which is inserted into a rod magnet 5, the The optical pickup 100 is driven in the radial direction of the optical disc 100 in synchronization with or independently of the two pickup bases 7.

[0027] The second pickup base 7, rail 4
The first pickup base 3 is movable in the radial direction of the optical disk 100 by a second electromagnetic coil 8 inserted into the bar-shaped magnet 5 so as to be able to move along the a and 4b.

[0028] Here, as shown in FIG. 2, on the rear surface of the optical pickup main body 1 described above, with the inclined portion 12 is provided on the surface of the second pickup base 7, abuts on the inclined portion 12 A hemispherical projection 7a is provided. These inclined portion 12, projection 7a and hinge 2
Form a tilt adjustment unit that adjusts the tilt angle of the optical pickup body 1 in the radial direction.

[0029] Here, the inclination angle [Delta] [theta] ° of the inclined portion 12 is determined in consideration of the distance from the objective lens 11 to the recording surface of the optical disc 100. That is, when the optical pickup main body 1 is tilted by θ ° in the radial direction, the moving amount (deviation) x of the focal point of the beam irradiated on the recording surface of the optical disk 100 is determined by the distance from the objective lens 11 to the recording surface of the optical disk 100. The value increases as the distance to the camera increases, and decreases as the distance to the camera decreases.

[0030] Therefore, the inclination angle [Delta] [theta] ° of the inclined portion 12
When the first pickup base 3 is moved x in the direction opposite to the tilt of the optical disc 100 in consideration of the distance from the objective lens 11 to the recording surface of the optical disc 100, the optical pickup main body 1 has the same tilt as the tilt of the optical disc 100. The angle is set to be inclined by θ ° in the direction.

In the center of the inclined portion 12, a projection 7a is provided.
And a concave portion 12a of a spherical shape is formed to engage with the recess. When the projection 7a is engaged with the concave portion 12a, the optical pickup main body 1 becomes horizontal and the optical pickup main body 1
And the second pickup base are connected, and the first and second pickup bases 3, 7 can be smoothly moved synchronously. Further, stoppers 12b and 12c for preventing the protrusion 7a from falling off are formed at both ends of the inclined portion 12.

[0032] Next, the tilt adjusting operation of the optical pickup device configured as described above, FIG. 3 (a), (b) ,
This will be described with reference to FIG. FIGS. 3A to 3C are partial cross-sectional side views illustrating the tilt adjustment operation in the optical pickup device.

FIG . 3A shows a case where the optical disc 100 is in a horizontal state (ideal state). In such a case, the optical pickup main body 1 is moved to the optical disk 1 by synchronously driving the first and second electromagnetic coils 6 and 8.
The information is recorded or read by moving in the opposite radial direction of 00.

In this case, since the first pickup base 3 and the second pickup base 7 move by the same distance in the same direction, a difference in the amount of movement occurs between the first pickup base 3 and the second pickup base 7. Absent. Therefore, the engagement state between the concave portion 12a of the inclined portion 12 and the projection portion 7a is maintained, and the optical pickup main body 1 in the horizontal state irradiates the optical disk 100 with a beam vertically.

FIG . 3B shows a case where the optical disc 100 is inclined rightward and downward due to its own weight or warpage. In such a case, without moving the second pickup base 7, only the first pickup base 3 is moved in the direction opposite to the inclination of the optical disc 100, that is, to the left.

[0036] Then, the first pickup base 3 difference amount of movement occurs between the second pickup base 7, the engaging recess 12a of the inclined portion 12 and the protruding portion 7a is released, the inclined portion 12 protrusion 7a. As a result, the optical pickup main body 1 moves the optical disc 10 around the hinge 2.
The beam is tilted at the same angle as 0, and the beam from the optical pickup body 1 is irradiated perpendicularly to the recording surface of the optical disc 100.

Further , by moving the first pickup base 3 in the direction opposite to the inclination of the optical disc 100, the focal position P of the beam irradiated from the optical pickup main body 1 onto the recording surface of the optical disc 100 is changed. Matches the position before adjusting the inclination of.

FIG . 3C shows a case where the optical disc 100 is tilted to the left due to its own weight or warpage. In such a case, only the first pickup base 3 is moved in the direction opposite to the tilt of the optical disc 100, that is, to the right.

[0039] Then, the difference between the amount of movement occurs between the first pickup base 3 and the second pickup base 7, the inclined portion 12 slides on the protrusion 7a. As a result, the optical pickup main body 1 moves the optical disc 100 around the hinge 2.
And the beam from the optical pickup body 1 is irradiated perpendicularly to the recording surface of the optical disc 100.

Further , by moving the first pickup base 3 in the direction opposite to the inclination of the optical disc 100, the focal position P of the beam irradiated from the optical pickup main body 1 onto the recording surface of the optical disc 100 is changed. Matches the position before adjusting the inclination of.

[0041] According to the optical pickup device of the present embodiment, the first pickup base 3 optical disc 1
The tilt adjustment can be performed in a short time by one step of moving in the direction opposite to the inclination of 00.

The hinge 2, the inclined portion 12, and the projection 7
Since the tilt adjustment can be performed by a, the weight of the device can be significantly reduced.

[0043] Furthermore, since by driving the device by two electromagnetic coils 60 and 80, the electromagnetic coil 60,8
0 can be reduced, and the optical pickup main body 1 can be operated at a high speed with such a small torque by reducing the weight of the device.

In the embodiment described above, the inclined portion 12 is provided on the back surface of the optical pickup main body 1 and the projection 7a is provided on the surface of the second pickup base 7, but the back surface of the optical pickup main body 1 is provided. The projection 7a may be provided on the second pickup base 7 and the inclined portion 12 may be provided on the surface of the second pickup base 7. Even with such a configuration, the same effect as in the above embodiment can be obtained.

Next, a description will be given of an optical pickup device according to a second embodiment of the present invention. FIG. 4 is a plan view showing an optical pickup device according to the second embodiment of the present invention.
FIG. 5 is a partial sectional side view of the optical pickup device.

The optical pickup apparatus of the present embodiment, a tilt shaft for rotatably supported an optical pickup main body in the radial direction, and the tilt adjustment pin provided vertically to the tilt axis, the tilt adjustment pin pivotally The tilt adjusting section is formed by the holding section for holding.

In FIG. 4 and FIG. 5, the optical pickup main body 1, a tilt shaft 21a on both sides, is attached to the pickup holder 20 formed with 21b. The pickup holder 20 includes two support plates 3 erected on the first pickup base 30 via tilt shafts 21a and 21b.
1, 32, it is supported rotatably in the radial direction. Further, as shown in FIG. 5, a tilt adjusting pin 22 is vertically provided on the tilt shaft 21a on the second pickup base 70 side.

The first pickup base 30 is movable along the rails 4 provided on one side, by a first rod-shaped magnet 5a and the first electromagnetic coil 6 provided on the other side, the second pickup base It is configured to be driven in the radial direction of an optical disk (not shown) in synchronization with or independently of the optical disk 70.

The rail 4 side of the first pickup base 30, Yes in notch 31 corresponding to a portion of the second pickup base 70 is formed, also, two spring holder 33 on both sides of the cutout portion 31 , 34 are erected.

On the other hand, the second pickup base 70, and movable along the rails 4, the second rod-shaped magnets 5
b and the second electromagnetic coil 8 are configured to be driven in the radial direction of the optical disk in synchronization with or independently of the first pickup base 30.

The cut-out portion 31 of the second pickup base 70
A holding portion 71 for rotatably holding the end of the tilt adjustment pin 22 is formed in a portion corresponding to. The holding portion 71 rotatably holds the end of the tilt adjustment pin 22 so that when a difference in the amount of movement occurs between the first pickup base 30 and the second pickup base 70, the tilt adjustment pin 22 Rotates the tilt shaft 21a, and tilts the optical pickup main body 1 (the pickup holder 20) in the radial direction.

[0052] That is, these tilt axes 21a and the tilt adjustment pin 22 and the holding portion 71, the optical pickup main body 1
Are formed.

[0053] In addition, the second pickup base 70,
The spring holder 33 of the first pickup base 30,
A spring holder 72 is provided between 34. The spring 33 is interposed between the spring holder 33 and the spring holder 72, and the spring 42 is interposed between the spring holder 34 and the spring holder 72.

[0054] The first and second pickup base 30,7
In the case where there is no difference in the movement amount between the first pickup base 30 and the second pickup base 70 as in the case where none of the first pickup bases 0 are driven or when these are driven synchronously, the two springs 33 are used. , 34 are balanced, and the optical pickup body 1 (pickup holder 20) is in a horizontal state (FIG. 6).
reference).

Next, the tilt adjusting operation of the optical pickup device of this embodiment having the above structure will be described with reference to FIG. FIG. 6 is an enlarged view of a tilt adjusting section of the optical pickup device.

[0056] When the optical disk is in a horizontal state, by driving the first and second electromagnetic coils 6 and 8 synchronously, the first and second pickup base 30 and 70 were simultaneously moved by the same amount, the recording of information Or perform reading.

In this case, since there is no difference in the amount of movement between the first pickup base 30 and the second pickup base 70, the tilt adjustment pin 22 does not rotate the tilt shaft 21a, and the optical pickup main body 1 is horizontally moved. State. As a result, the beam from the optical pickup main body 1 is irradiated perpendicularly to the optical disk.

[0058] Also, when the optical disk is tilted, without moving the second pickup base 70 moves only the first pickup base 30 in the direction opposite to the inclination of the optical disc.

[0059] Then, the difference between the amount of movement is caused between the first pickup base 30 between the second pickup base 70,
The tilt adjusting pin 22 connecting the first and second pickup bases 30, 70 rotates the tilt shaft 21a.

As a result, the optical pickup main body 1 (pickup holder 20) supported by the tilt shaft 22 is tilted at the same angle as the optical disk, and
From the optical disk is irradiated perpendicularly to the recording surface of the optical disk.

Further , by moving the first pickup base 30 in the direction opposite to the tilt of the optical disc, the focal position P of the beam irradiated from the optical pickup main body 1 onto the recording surface of the optical disc is changed. Matches the position before adjusting the inclination of.

[0062] According to the optical pickup apparatus of the embodiment, similarly to the first embodiment, it is possible to perform quick tilt adjustment in one step, it is possible to reduce the weight of the device, Further, the optical pickup main body 1 can be operated at high speed with a small torque.

[0063] The optical pickup apparatus of the present invention is not limited to the above embodiments. For example,
The tilt adjustment unit is not limited to the above embodiments, and the optical pickup main body is moved by the difference in the amount of movement between the first pickup base and the second pickup base caused when the first pickup base is moved in the direction opposite to the tilt of the optical disc. The configuration may be changed to another configuration as long as it can be tilted at the same angle as the optical disk.

[0064]

As described above, according to the optical pickup device of the present invention, the tilt can be quickly adjusted in one step, the device can be reduced in weight, and the optical pickup body can be mounted with a small torque. High speed operation is possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical pickup device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the optical pickup device.

FIGS. 3A to 3C are explanatory views of a tilt adjusting operation in the optical pickup device. FIGS.

FIG. 4 is a plan view showing an optical pickup device according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional side view of the optical pickup device.

FIG. 6 is an enlarged view of a tilt adjusting unit of the optical pickup device.

FIG. 7 is a perspective view showing a conventional optical pickup device.

FIGS. 8A to 8C are explanatory diagrams of a tilt adjustment operation in a conventional optical pickup device.

[Explanation of symbols]

 Reference Signs List 1 optical pickup main body 2 hinge 3, 30 first pickup base 4, 4a, 4b rail 5 rod-shaped magnet 5a first rod-shaped magnet 5b second rod-shaped magnet 6 first electromagnetic coil 7, 70 second pickup base 7a protrusion 8 second Electromagnetic coil 11 Objective lens 12 Inclined part 21a Tilt axis 22 Tilt adjustment pin 71 Holding part

Claims (2)

(57) [Claims] 1. An optical pickup main body, one or more rails provided in a radial direction of an optical disk, one or more rod-shaped magnets provided parallel to the rail, and the optical disk along the rails. A first pickup base movably provided in a radial direction of the optical pickup main body, the first pickup base rotatably mounted on the optical pickup main body, and a first pickup base movably provided on the rod-shaped magnet, and the first pickup base is moved to the radius of the optical disk by a magnetic force. A first electromagnetic coil driven in the first direction, a second pickup base movably provided in the radial direction of the optical disk along the rail, and a second pickup base movably provided on the rod-shaped magnet, and a magnetic force. Connecting the first and second pickup bases to a second electromagnetic coil that drives the optical disc in a radial direction of the optical disc. When the first pickup base is moved in the direction opposite to the tilt of the optical disc to cause a difference in the amount of movement between the first pickup base and the second pickup base, this movement is performed. A tilt adjusting unit for inclining the optical pickup main body at the same angle as the optical disc based on the difference in the amount, and recording information on the optical disc or the optical disc.
Optical pickup device for reading information recorded in a disk
In the above, the tilt adjustment unit may move the optical pickup main body to the first pickup base.
And connect the optical pickup body to the radial
A hinge that is rotatably held in the first direction, an inclined portion formed on the back surface of the optical pickup main body, and the inclined portion formed on the surface of the second pickup base.
An optical pickup device comprising: a projection that abuts on an oblique portion . 2. An optical pickup main body and a half of an optical disk.
One or more radially provided rails and this rail
One or more bar-shaped magnets provided in parallel with the
Moveable in the radial direction of the optical disk along the rail
The optical pickup body is rotatably mounted.
Movable to the first pickup base and the bar-shaped magnet
Provided on the first pickup base by magnetic force
A first electromagnetic coil for driving the
And the radial direction of the optical disk along the rail.
A second pickup base movably provided, and
The rod-shaped magnet is movably provided, and the second
Drives the pickup base in the radial direction of the optical disk
A second electromagnetic coil to be driven, and the first and second pickups.
The first pick-up is provided to connect the
The tape base in the direction opposite to the tilt of the optical disc.
The first pickup base and the second pickup base.
When a difference in the amount of movement is
Move the optical pickup body forward based on the difference in the amount of movement.
It has a tilt adjustment unit that tilts it to the same angle as the optical disc.
Recording information on the optical disk or the optical disk
Optical pickup device for reading information recorded in a disk
In the above, the tilt adjustment unit may move the optical pickup main body to the first pickup base.
And connect the optical pickup body to the radial
A hinge rotatably held in a direction, and an inclined portion formed on the surface of the second pickup base.
And the inclined portion formed on the back surface of the optical pickup body
Optical pickup device, wherein the protrusions Toka Ranaru abutting the.