JPH09259462A - Information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a movable optical head and to shorten the seek time by separating a driving magnetic circuit rotating a shutter from the optical head. SOLUTION: When a disk D1 of DVD specification is used in the state where an opening part 19 with a small diameter of the shutter 17 is formed so as to have an opened amount for the CD specification while being confronted with a laser introducing port 16 of the optical head 2, carriages 10 are traveled to the side of the driving magnetic circuit 24 for shutter along guide shafts 11, 11 and stopped at the position where a magnet 21 for the shutter 17 is entered into a U-shaped yoke 25 inside. When a disk D2 of CD specifiction is used, the carriages 10 are traveled toward the side of circuit 24 along the shafts 11, 11 and stopped at the position where the magnet 21 for the shutter 17 is entered into yoke 25 inside. Then, the 1st opening part with small diameter is confronted with the laser introducing port 16, and the opened amount is decreased for the CD specification.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing device applied as an optical disk device, for example.

[0002]

2. Description of the Related Art Optical disk devices are equipped with an optical head for recording / reproducing data.
Thin substrate thickness (0,6m) to support higher recording density
m) Standard discs have appeared (hereinafter referred to as DVD standard discs).

Therefore, in an optical disk device, a disk having a normal substrate thickness (1.2 mm) (hereinafter referred to as CD standard) is used.
It is required to record / reproduce both the DVD and the DVD standard disc.

However, when the substrate thickness of the disc is different, the specifications of the objective lens of the optical head are different, so it is difficult to correctly read different disc data by one type of lens.

Therefore, an aperture shutter system is often used in which an optical system corresponding to a DVD standard disc having a thin substrate is constructed, and in the case of a thick CD standard disc, a corresponding beam aperture is narrowed to narrow the beam diameter.

The aperture shutter is mounted on the optical head (movable part) because the positional deviation with the objective lens poses a problem.
The aperture shutter is rotatably driven by an electromagnet including a magnet, a coil, and a yoke to change the beam diameter.

[0007]

However, in the prior art, the movable optical head is provided with an aperture shutter, a magnet,
At the same time, since the coil and the yoke are all mounted, there is a disadvantage that the weight of the movable part becomes heavy, the seek time becomes long, and it becomes weak against disturbance acceleration.

Further, it is necessary to increase the thrust of the linear motor for moving the optical head, which causes a problem of cost increase. Therefore, it is an object of the present invention to provide an information processing apparatus that reduces the weight of the movable optical unit, shortens the seek time, is strong against disturbance acceleration, and does not need to increase the thrust of the linear motor.

[0009]

In order to solve the above problems, the present invention has a light source for oscillating a laser beam and an inlet for introducing a laser beam oscillated from the light source. Then, an optical head for selectively irradiating different types of information storage media with laser light introduced from the introduction port, drive means for causing the optical head to travel in the radial direction of the information storage medium, and the optical unit A shutter that is rotatably provided on the head and that changes the opening amount of the introduction port according to the type of the information storage medium, and a magnet that is provided coaxially with the shutter and that rotates integrally with the shutter. And a drive magnetic circuit that is provided separately from the optical head and that rotates the shutter by generating an electromagnetic force by the magnet that is closer to the optical head as it travels.

According to a second aspect of the present invention, there is provided a light source for oscillating a laser beam and an introduction port for introducing the laser beam oscillated from the light source, and the laser beam introduced through the introduction port has different information. An optical head for selectively irradiating the storage medium, a drive means for causing the optical head to travel along the radial direction of the information storage medium, and a rotatable unit provided on the optical head for adjusting the type of the information storage medium. Accordingly, a shutter that changes the opening amount of the introduction port, and a magnet that is provided coaxially with the shutter and that rotates integrally with the shutter,
A drive magnetic circuit, which is provided separately from the optical head and rotates the shutter by generating an electromagnetic force by the magnet that is closer to the optical head when traveling, and a rotation angle of the shutter is 180 degrees. The control means for controlling the following is provided.

According to a third aspect of the present invention, there is provided a light source for oscillating a laser beam and an introduction port for introducing the laser beam oscillated from the light source, and the laser beam introduced through the introduction port has different information. An optical head for selectively irradiating the storage medium, a drive means for causing the optical head to travel along the radial direction of the information storage medium, and a rotatable unit provided on the optical head for adjusting the type of the information storage medium. Accordingly, a shutter that changes the opening amount of the introduction port, and a magnet that is provided coaxially with the shutter and that rotates integrally with the shutter,
A magnetic member for generating a suction force between the magnet and the rotary force to the shutter and a shutter to which the magnetic force is applied by the magnetic member are brought into contact with each other to position and hold the shutter at the variable aperture position. And a drive magnetic circuit that rotates the shutter by generating an electromagnetic force by the magnet that is provided separately from the optical head and that is closer to the optical head as the optical head travels.

According to a fourth aspect of the present invention, there is provided a light source that oscillates a laser beam and an introduction port for introducing the laser beam oscillated from the light source, and the laser beam introduced from the introduction port has different information. An optical head for selectively irradiating the storage medium, a drive means for causing the optical head to travel along the radial direction of the information storage medium, and a rotatable unit provided on the optical head for adjusting the type of the information storage medium. Accordingly, a shutter that changes the opening amount of the introduction port, and a magnet that is provided coaxially with the shutter and that rotates integrally with the shutter,
A magnetic member for generating a suction force between the magnet and the rotary force to the shutter and a shutter to which the magnetic force is applied by the magnetic member are brought into contact with each other to position and hold the shutter at the variable aperture position. And a drive magnetic circuit that rotates the shutter by generating an electromagnetic force by the magnet that is provided separately from the optical head and that is closer to the optical head as the optical head moves. The magnetizing direction of the magnet is tilted in a direction to be rotated with respect to the magnetic flux generated by the drive magnetic circuit when the shutter is positioned by the positioning means.

According to a fifth aspect of the present invention, there is provided a light source for oscillating a laser beam and an introduction port for introducing the laser beam oscillated from the light source, and the laser beam introduced from the introduction port has different information. An optical head for selectively irradiating the storage medium, a drive means for causing the optical head to travel along the radial direction of the information storage medium, and a rotatable unit provided on the optical head for adjusting the type of the information storage medium. Accordingly, a shutter that changes the opening amount of the introduction port, and a magnet that is provided coaxially with the shutter and that rotates integrally with the shutter,
And a drive magnetic circuit that is provided separately from the optical head and that rotates the shutter by generating an electromagnetic force by the magnet that is closer to the optical head when it travels, and combines the shutter and the magnet. The center of gravity of the object is matched with the center of rotation.

According to the present invention, the drive magnetic circuit for driving the shutter is provided separately from the optical head, so that the weight of the movable optical head is reduced, the seek time is shortened, and it is strong against the disturbance acceleration, and the driving means. It enables the optical head to run well without increasing the thrust.

Further, the shutter is brought into contact with the positioning means by the attractive force generated between the magnetic member and the magnet, and the shutter is positioned and held at the opening amount variable position.
The shutter can be positioned stably and accurately.

Further, by aligning the center of gravity of the combined shutter and magnet with the center of rotation thereof, it is possible to regulate the position shift of the shutter due to disturbance during seek or external vibration.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 2 shows a separation optical system type optical disk device, and in the figure, reference numeral 1 denotes a spindle motor which supports and rotates the disk. As a disk, the substrate thickness is thin (0,6 m) to support high recording density.
m) Standard disc D1 (hereinafter referred to as DVD standard disc) or normal substrate thickness (1.2 mm) disc D2 (hereinafter referred to as CD standard) is used.

A movable optical head 2 is opposed to the disk D1 (D2). The optical head 2 is reciprocated along the radial direction of the disk D1 (D2) by a drive magnetic circuit 3 described later. Optical head 2
A rising mirror 4 for raising the laser beam R is provided inside the disk, and the laser beam R is placed on the upper surface of the disk D1.
An objective lens 5 for collecting light at (D2) is provided.
In addition, an introduction port 16 for introducing the laser beam R is formed in the front surface of the optical head 2.

A fixed optical section 6 for oscillating a laser beam is provided on the optical head 2 on an extension of the optical head 2 in the traveling direction. A semiconductor laser 7 that oscillates a laser beam and a collimator lens 8 that collimates the laser beam are arranged in the fixed optical unit 6.

FIG. 1 shows a drive magnetic circuit 3 for driving the optical head 2. The optical head 2 is the carriage 1.
The carriage 10 is mounted on a disk D1 (D
It is designed to be guided along the radial direction of 2).
The guide shaft 1 is provided on both sides of the carriage 10.
Linear motor coils 13, 13 for slidably inserting the motors 1, 11 are provided. Guide shaft 11,
Both ends of 11 are supported by linear motor yokes 14, 14.

On the other hand, on the fixed optical section 6 side, a drive magnetic circuit 24 for operating a shutter 17 described later is provided. That is, the drive magnetic circuit 24 is the optical head 2
It is provided separately from. The drive magnetic circuit 24 is composed of a U-shaped yoke 25 and a coil 26 wound around the U-shaped yoke 25.

FIG. 3 shows a shutter 17 for varying the opening amount of the laser introduction port 16 of the optical head 2. The shutter 17 is rotatably provided on the front surface of the optical head 2 via a rotary shaft 18. A magnet 21 is coaxially provided on the shutter 17 via a rotary shaft 18, and is rotated integrally with the shutter 17.

The first opening 1 is provided at one end of the shutter 17.
9, second end having a larger diameter than the first opening 19 at the other end
The opening 20 is formed. These first and second
The openings 19 and 20 of the
6 are selectively opposed to each other. That is,
When the CD standard disc D2 is used as the disc, the first opening 19 is opposed to the laser introduction port 16 of the optical head 2 to reduce the opening amount, and the DVD standard disc D1 is used as the disc. When asked,
The second openings 20 are opposed to each other to increase the opening amount.

The front surface of the optical head 2 has a rotating shaft 1
A magnetic piece 22 for pressurization that is located above the magnet 8 and that generates an attractive force between the magnet 21 and the magnet 21 is provided. Shutter 17
Claws 17a and 17b are provided on both ends of the optical head 2, and a stopper 23 that selectively abuts the claws 17a and 17b of the shutter 17 is provided on the front surface of the optical head 2. By contacting the claw 17a or 17b of the shutter 17 with the stopper 23, the shutter 17 is positioned so that the first or second opening 19, 20 faces the laser introduction port 16 of the optical head 2. There is.

Also, the rotation angle of the shutter 17 is set to 180 degrees or less, whereby the claws 17a and 17b of the shutter 17 are pressed against the stopper 23 of the optical head 2 by the attraction force between the magnet 21 and the preload magnetic piece 22. , Shutter 1
7 can be positioned reliably.

In FIG. 3, a counterclockwise moment is applied to the shutter 17 by the attraction of the magnetic piece 22 and the magnet 21, and the claw 17a is pressed against the stopper 23 so that the shutter 17 is inserted into the inlet 16 of the optical head 2 and has a small diameter. 1 shows a state in which the first opening 19 is held in an opposed state.

In FIG. 4, a clockwise moment is applied to the shutter 17 due to the attraction of the magnetic piece 22 and the magnet 21.
The claw 17b is pressed against the stopper 23 so that the optical head 2
The large-diameter second opening 20 of the shutter 17
Shows a state in which they are held facing each other.

FIG. 5 shows the switching operation of the shutter 17. For example, the first opening 19 having a small diameter of the shutter 17 is opposed to the laser introduction port 16 of the optical head 2 so that the CD
When the DVD standard disc D1 is used with the standard opening amount, the carriage 10 moves the guide shafts 11 and 11 by the drive magnetic circuit 3 of the optical head.
6 is driven toward the drive magnetic circuit 24 for the shutter, and as shown in FIG. 6, the magnet 21 of the shutter 17 of the optical head 2 is stopped at a position where the magnet 21 enters the inside of the U-shaped yoke 25. . Then, a current is applied to the coil 26 so that the magnetizing direction of the magnet 21 and the magnetic flux generated by the U-shaped yoke 25 are opposite.

In FIG. 6, the upper side of the U-shaped yoke 25 is the N pole,
The lower side is the south pole. As a result, the magnet 21 of the shutter 17 and the magnetic field generated by the U-shaped yoke 25 repel each other, and the shutter 17 rotates clockwise. As shown in FIG. 4, the claw 17b of the shutter 17 contacts the stopper 23. The second opening 20 having a large diameter is stopped by coming into contact with the optical head 2.
The opening amount is increased for the DVD standard so as to face the laser introduction port 16.

Further, the large-diameter second opening 20 of the shutter 17 is opposed to the laser introduction port 16 of the optical head 2 and D
When the CD standard disc D2 is used in the state where the opening amount for the VD standard is used, the linear motors 14 and 1 are used.
4 causes the carriage 10 to travel along the guide shafts 11 and 11 toward the drive magnetic circuit 24 side, and stops at a position where the magnet 21 of the shutter 17 of the optical head 2 enters inside the U-shaped yoke 25. Then, the magnet 21
An electric current is passed through the coil 26 so that the magnetization direction of the above and the magnetic flux generated by the U-shaped yoke 25 are opposite. This allows
The magnet 21 of the shutter 17 and the magnetic field generated by the U-shaped yoke 25 repel each other to rotate the shutter 17 counterclockwise from the state shown in FIG. 4, and as shown in FIG. The first opening portion 19 having a small diameter is brought into contact with the stopper 23 and stopped, and the laser introduction port 1 of the optical head 2
6, the opening amount is reduced for the CD standard.

If the rotation angle of the shutter 17 is set to 180 degrees or less, the direction in which the shutter 17 rotates is uniquely determined, so that the problem of reverse rotation does not occur. In FIG. 6, the state in which the magnet 21 rotates clockwise with respect to the magnetic field generated by the U-shaped yoke 25 is the initial state.
The shutter 17 rotates only clockwise.

Further, the center of gravity of the shutter 17 and the magnet 21 that are united with each other and the center of rotation thereof are coincident with each other, and the shutter 17 causes unnecessary vibrations due to disturbances such as during seek and external vibrations, resulting in positional displacement. Can also be prevented.

[0033]

As described above, according to the present invention, since the drive magnetic circuit for rotating the shutter is separated from the optical head, the weight of the movable optical head can be reduced, the seek time can be shortened, and the disturbance acceleration can be reduced. To be stronger,
Moreover, the thrust of the drive means of the optical head can be reduced, and the cost can be reduced.

Further, since the shutter is always brought into contact with the positioning means and positioned by the attraction force of the magnet and the magnetic member integrated with the shutter, the position of the shutter is stabilized.

Further, since the center of gravity of the combined shutter and magnet is made coincident with the center of rotation, the shutter will not be displaced due to disturbance load due to seek or external vibration.

[Brief description of drawings]

FIG. 1 is a perspective view showing an optical head and a drive system thereof according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing an optical disc device.

FIG. 3 is a front view showing a state in which the opening amount of the laser introduction port of the optical head is small.

FIG. 4 is a front view showing a state in which an opening amount of a laser introduction port of the optical head is made large.

FIG. 5 is a diagram showing an operation when the opening amount of the laser introduction port of the optical head is changed.

FIG. 6 is a diagram showing a drive magnetic field for rotating a shutter.

[Explanation of symbols]

 2 ... Optical head 3 ... Driving magnetic circuit (driving means) R ... Laser light 7 ... Semiconductor laser (light source) 16 ... Inlet D1, D2 ... Disk (information storage medium) 17 ... Shutter 21 ... Magnet 24 ... Driving magnetic circuit 25 … U-shaped yoke 26… Coil

Claims (5)

[Claims] 1. A light source for oscillating a laser beam, and an introduction port for introducing a laser beam oscillated from the light source. The laser beam introduced through the introduction port is selectively applied to different types of information storage media. An optical head for irradiating, a drive means for causing the optical head to run along the radial direction of the information storage medium, a rotatably provided on the optical head, and the introduction port depending on the type of the information storage medium. Of the shutter, the magnet that is coaxial with the shutter and that rotates together with the shutter, and the magnet that is provided separately from the optical head and that is closer to the traveling of the optical head. An information processing apparatus, comprising: a drive magnetic circuit that rotates the shutter by generating an electromagnetic force. 2. A light source for oscillating a laser beam, and an introduction port for introducing the laser beam oscillated from the light source. The laser beam introduced through the introduction port is selectively applied to different types of information storage media. An optical head for irradiating, a drive means for causing the optical head to run along the radial direction of the information storage medium, a rotatably provided on the optical head, and the introduction port depending on the type of the information storage medium. Of the shutter, the magnet that is coaxial with the shutter and that rotates together with the shutter, and the magnet that is provided separately from the optical head and that is closer to the traveling of the optical head. A drive magnetic circuit that rotates the shutter by generating an electromagnetic force; and a regulation unit that regulates a rotation angle of the shutter to 180 degrees or less. Information processing device. 3. A light source for oscillating a laser beam, and an introduction port for introducing the laser beam oscillated from the light source. The laser beam introduced through the introduction port is selectively applied to different types of information storage media. An optical head for irradiating, a drive means for causing the optical head to run along the radial direction of the information storage medium, a rotatably provided on the optical head, and the introduction port depending on the type of the information storage medium. Of the shutter, a magnet that is coaxial with the shutter and that rotates together with the shutter, and a magnetic member that generates an attractive force between the magnet and a rotational force to the shutter. Positioning means for abutting a shutter to which a rotational force is applied by the magnetic member to position and hold the shutter at the opening amount variable position, and the positioning means separated from the optical head. An information processing device, comprising: a drive magnetic circuit that rotates the shutter by generating an electromagnetic force by the magnet that is closer to the traveling head of the learning head. 4. A light source for oscillating a laser beam, and an introduction port for introducing the laser beam oscillated from the light source. The laser beam introduced through the introduction port is selectively applied to different types of information storage media. An optical head for irradiating, a drive means for causing the optical head to run along the radial direction of the information storage medium, a rotatably provided on the optical head, and the introduction port depending on the type of the information storage medium. Of the shutter, a magnet that is coaxial with the shutter and that rotates together with the shutter, and a magnetic member that generates an attractive force between the magnet and a rotational force to the shutter. Positioning means for abutting a shutter to which a rotational force is applied by the magnetic member to position and hold the shutter at the opening amount variable position, and the positioning means separated from the optical head. A drive magnetic circuit that rotates the shutter by generating an electromagnetic force by the magnet that is closer to the magnetic head when the shutter is running. The magnetizing direction of the magnet is such that the shutter is positioned by the positioning means. The information processing apparatus is tilted in a direction desired to rotate with respect to the magnetic flux generated by the drive magnetic circuit. 5. A light source for oscillating a laser beam, and an introduction port for introducing the laser beam oscillated from the light source. The laser beam introduced through the introduction port is selectively applied to different types of information storage media. An optical head for irradiating, a drive means for causing the optical head to run along the radial direction of the information storage medium, a rotatably provided on the optical head, and the introduction port depending on the type of the information storage medium. Of the shutter, the magnet that is coaxial with the shutter and that rotates together with the shutter, and the magnet that is provided separately from the optical head and that is closer to the traveling of the optical head. A drive magnetic circuit for rotating the shutter by generating an electromagnetic force, wherein the center of gravity of the combined shutter and magnet is aligned with its rotation center. An information processing apparatus characterized by the following.