JP2752694B2 - Optical recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical recording / reproducing apparatus, and more particularly, to a structure of an optical pickup used in the apparatus.

(Prior Art) As is well known, for example, at the time of reproduction, a laser beam is used to scan the surface of a disk, and information recorded by a beam reflected by the presence or absence of pits formed on the surface is read. In an optical disk device that performs reading,
An optical pickup for guiding the above-mentioned scanning beam to the disk surface and from the disk surface to the light receiving section is provided.

Although the optical pickup described above does not describe the details of its structure, a light emitting element such as a semiconductor laser and a diffraction grating, a deflecting prism, and a quarter-wave plate for setting irradiation light from this element as scanning light for a disk surface are described. And a light source mount having a collimator lens, an objective lens for forming the scanning light from the light source mount on the disk surface, and an optical axis direction corresponding to the focusing direction and a direction perpendicular to this direction. And a driving member for moving the disk in the radial direction of the disk surface, which is the tracking direction.

An optical pickup equipped with each of the above-described members is unitized and supported movably on guide rails arranged in parallel in the tracking direction on a substrate of an optical disk device, and a seek motor connected to this unit is provided. Thus, it is possible to move to a set position (for example, JP-A-63-13129).

(Problems to be Solved by the Invention) Incidentally, the above-described optical pickup has a structure in which it can be moved in the tracking direction. However, when the optical disk device is turned off for some reason at the time of moving to a certain position. , And maintain the stopped state at that position. For this reason, the irradiation light incident part including the objective lens in the optical pickup tends to remain exposed.

Therefore, the optical pickup in such a state has a structure that is easily exposed, so that dust and dirt easily adhere to the optical components, and the transmission efficiency of irradiation light is deteriorated, and accurate reproduction / recording output is performed. May not be obtained. In addition, when the amount of light reflected from the disk surface that reaches the light receiving unit is reduced, the carrier-to-noise ratio (C / N value) is deteriorated, and the reproduction effect may be significantly deteriorated.

In such a case, the wavefront of the irradiation light, that is, the so-called laser beam is disturbed, the wavefront aberration increases, and the beam spot is easily blurred. You may not be able to expect it.

Therefore, an object of the present invention is to provide an optical recording / reproducing apparatus capable of accurately recording / reproducing information by minimizing exposure of an optical pickup during non-scanning, in view of the above-described problems in the optical disc apparatus. To get.

(Means for Solving the Problems) In order to achieve this object, the present invention includes a moving optical system movable along a recording surface of a recording medium, and a fixed optical system separated from the moving optical system. In the optical recording / reproducing apparatus, any one of the fixed optical system and the movable optical system has an opening at a portion where these two optical systems are opposed to each other, so that these two optical systems can be fitted to each other. When the moving optical system does not scan the recording surface, the two optical systems are fitted to each other.

(Operation) According to the present invention, when the power of the optical recording / reproducing apparatus which has been set to the energized state is turned off, the moving optical system fits into the opening of the light source mount.

Further, according to the present invention, the moving optical system that fits into the opening of the light source mount, when fitted, forms an optical path from the light source by a flexible member provided on its outer peripheral portion or the inner peripheral surface of the opening. Isolated from surroundings.

Further, according to the present invention, the above-described flexible member blocks the irradiation light incident portion and the surroundings of the moving optical system, and when the flexible member comes into contact with the objective lens, the surface of the objective lens slides. Being cleaned.

Embodiment An embodiment of the present invention will be described below in detail with reference to FIGS. 1 to 7.

FIG. 1 is a model diagram for explaining a main part of an optical recording / reproducing apparatus according to an embodiment of the present invention.

The optical recording / reproducing apparatus 1 in the present embodiment includes an optical pickup 3 arranged corresponding to an optical disk 2 as a recording medium.

That is, the optical pickup 3 mainly includes the light source mount 4 and the moving optical system 5, and the light source mount 4
It is constituted by a housing having an opening 4A formed on the side facing the moving optical system 5.

Although not shown, the light source mount 4 described above is equipped with a light emitting element made of a semiconductor laser, a diffraction grating, a polarizing prism, a quarter-wave plate, and a collimator lens for converting irradiation light from the light emitting element into parallel light. And is fixed directly on the apparatus main body or on a substrate provided in the apparatus main body or the like.

On the other hand, a pair of guide rails 6 extending in the tracking direction corresponding to the radial direction of the optical disk 2 are provided on the substrate, and the moving optical system 5 is provided on the guide rails 6.

That is, the movable optical system 5 is a movable unit mounted on the guide rail 6 and has a shape in which the side of the light source mount 4 facing the opening 4A can fit into the opening 4A. A bobbin 5A is provided on the surface on the side opposite to the above, and a linear motor is configured in cooperation with a yoke 7 arranged on a substrate corresponding to the bobbin 5A.

Although not shown in detail, the irradiation light from the light source mount 4
The objective lens 8 focuses the irradiation light on the recording surface of the disk 2 and a servo drive mechanism that performs focusing and tracking servo of the objective lens 8 is provided.

Further, a flexible member 9 made of a material such as resin or rubber is provided on the inner peripheral surface of the opening 4A of the light source mount 4 to which the moving optical system 5 fits. The member 9 covers the outer peripheral portion of the moving optical system 5 that enters the opening 4A, and blocks an optical path formed between the light source mount 4 and the moving optical system 5 from the surroundings. Therefore, the moving optical system 5 fitted in the opening 4A of the light source mount 4 is isolated from the surroundings by blocking its optical path from the surroundings.

On the other hand, the coil 5B wound around the bobbin 5A in the above-described linear motor is connected to the drive control unit 10 that controls the movement of the moving optical system.

That is, as shown in FIG. 2, the drive control unit 10 is connected to a seek operation drive circuit 11 for generating a drive signal for performing a seek operation, and has a moving optical system A power switch 13 of the optical recording / reproducing apparatus is connected via a charging / discharging circuit 12 for supplying a current for moving the light source 5 toward the light source mount 4 side.

This power switch 13 is configured to interlock a return switch 14 provided on the output side of the charge / discharge circuit 12,
The return switch 14 sets the ON state when the power switch 13 is set to the OFF state.

Therefore, when the power switch 13 is turned on and the optical recording / reproducing apparatus is operating, the return switch 14 is opened, and when the power switch 13 is turned off, the return switch 14 is turned on, A drive current from the charge / discharge circuit 12 is applied to the coil 5B to move the moving optical system 5 toward the light source mount 4.

The moving optical system 5 that returns toward the light source mount 4 by the ON state of the above-mentioned return switch 14 determines the amount of movement required for the return by a signal from a position sensor (not shown). This is performed by determining an excitation time and a moving direction corresponding to a stroke from the initial position to the current position obtained by the position sensor, and adopting an exciting method capable of reversing the moving direction. They are arranged in a state of being combined.

Since the present embodiment has the above-described structure, the optical pickup 3 is shown in FIG. 2 when the power switch 13 of the optical recording / reproducing apparatus is turned on and the optical recording / reproducing apparatus is in a predetermined recording / re-ecology. Seek operation drive circuit 11 and movable optical system 5 shown
Is moved and arranged at a predetermined track position by a servo drive mechanism provided inside the. At this point, the charging / discharging circuit 12 shown in FIG. 2 performs a charging operation.

On the other hand, when the power switch 13 of the optical recording / reproducing apparatus is turned off, the return switch 14 shown in FIG. 2 is turned on, and the output side of the charging / discharging circuit 12 is set to the conductive state with the coil 5B. An exciting current flows through the coil 5B.

Therefore, in this state, the moving optical system 5 in the optical pickup 3 which was in the scanning position is mounted on the light source mount 4.
, And a part thereof is fitted into the opening 4A of the light source mount 4 and stopped, and as shown in FIG.
The irradiation light incident part facing 4A is cut off from the surroundings and isolated.

According to the present embodiment, when the power of the optical recording / reproducing apparatus is turned off, the opening or a part of the moving optical system in the optical pickup is fitted into the light source mount, and the irradiation light incident part in the moving optical system. By covering the surrounding area with a light source mount, it is possible to prevent dust and dirt from entering the inside of the moving optical system, and to adhere to the opening of the light source mount,
Alternatively, dust or dust entering the mount can be suppressed.

This means that, for example, in both the light source mount and the moving optical system, when a cover made of a transparent member is provided at the opening, the surface is provided when the cover is provided, and when the cover is not provided, the optical device provided inside is provided. This means that if dust or dirt adheres to the part, it is possible to prevent the occurrence of alarming problems in optical characteristics, thereby achieving an effect of maintaining the optical characteristics in a good state. Become.

In addition, since the optical recording / reproducing apparatus can be returned to a predetermined position when the power of the optical recording / reproducing apparatus is turned off, for example, when an unexpected disturbance acts on the moving optical system 5 during transportation or the like. In this case, unexpected movement of the moving optical system 5 can be suppressed, and thereby collisions with other structural components that may occur at the time of unexpected movement can be prevented.

By the way, in the above-described embodiment, a structure is adopted in which a part of the moving optical system 4 is fitted inside the opening 4A of the light source mount 4, but instead, as shown in FIG. Opening 4A in light source mount 4 on 5 side
Alternatively, a protruding piece 5D that can be fitted to the outer periphery may be formed and fitted.

The opening 4A in the light source mount 4 described above is
As shown in FIGS. 5 and 6, this is an example in which a closed section can be formed in cooperation with the moving optical system 5 side. 5 may be formed in a box shape that can cover the periphery.

 FIG. 7 shows another embodiment of the present invention.

That is, the feature of this embodiment is that the opening of the light source mount is
4A, a flexible member 9 is provided, and the flexible member 9 is provided so as to extend to a position above the objective lens 8 of the moving optical system 5.

In FIG. 7, the light source mount 4 extends the upper edge 4A1 of the opening 4A to a position where the movable optical system 5 reaches above the objective lens 8 provided therein when the movable optical system 5 returns and moves. A flexible member 9 is disposed on a surface of the upper edge 4A1 on the side of the objective lens 8.

Since the present embodiment has the above-described structure, when the power switch 13 of the optical recording / reproducing apparatus is turned off, the moving optical system 5 is operated through the operation of the drive control unit 10 described above.
When is fitted into the opening 4A of the light source mount 4, the objective lens in the moving optical system 5 is brought into contact with the flexible member 9 on the light source mount 4 side, thereby having the same structure as that shown in FIG. In addition, the incident portion of the irradiation light in the moving optical system 5 can be isolated from the surroundings, and the dust or the like can be removed by sweeping the surface of the objective lens.

(Effects of the Invention) As described above, according to the present invention, the moving optical system built in the optical recording / reproducing apparatus is fitted into the light source mount when the power of the apparatus is turned off. The optical path of the irradiation light set in the moving optical system and the light source mount can be isolated from the surroundings, thereby preventing dust and dirt from entering the optical components in the moving optical system and the light source mount. It is possible to prevent a decrease in the recording / reproducing characteristics due to a decrease in the optical characteristics of the optical component.

Further, according to the present invention, since the opening of the light source mount or the movable optical system corresponding to this opening is provided with the flexible member capable of contacting the other party, the gap between the movable optical system and the light source mount is reduced. It is ensured that it is shut off,
The objective lens of the moving optical system can also be cleaned by the flexible member, thereby making it possible to more reliably prevent the optical characteristics of the optical component from deteriorating.

[Brief description of the drawings]

FIG. 1 is a model diagram for explaining a main part in an optical recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing a drive control unit of the main part shown in FIG. 1, and FIG. FIG. 4 is a model diagram for explaining the operation of the main part shown in FIG. 1, FIG. 4 is a model diagram corresponding to FIG. 3 showing a modification of the main part shown in FIG. 1, FIG. 5, and FIG. Is a partial perspective view showing a partially modified example of the main part shown in FIG. 1, and FIG. 7 is a model diagram corresponding to FIG. 3 showing the main part of an optical recording / reproducing apparatus according to another embodiment of the present invention. . 1. Optical recording / reproducing device 2. Optical disk 3.
Optical pickup, 4 …… Light source mount, 4A …… Opening,
5 moving optical system, 6 guide rail, 8 objective lens, 9 flexible member, 10 drive control unit, 12 charge / discharge circuit, 13 power switch, 14 Return switch.

Claims (5)

(57) [Claims] 1. An optical recording / reproducing apparatus comprising: a movable optical system movable along a recording surface of a recording medium; and a fixed optical system separated from the movable optical system. An opening that allows these two optical systems to be fitted to each other, at a position where these two optical systems are opposed to each other, and when the moving optical system does not scan the recording surface, An optical recording / reproducing apparatus, wherein optical systems are fitted to each other. 2. The optical recording / reproducing apparatus according to claim 1, wherein a flexible member is provided inside the opening, and the flexible member blocks a gap between the two optical systems. apparatus. 3. An optical recording / reproducing apparatus comprising: a movable optical system movable along a recording surface of a recording medium; and a fixed optical system separated from the movable optical system. In the part facing the optical system,
An opening capable of fitting with the moving optical system having a flexible member inside thereof, and a light source for emitting a light beam from the opening; and the moving optical system is configured to receive the light from the fixed optical system. The movable optical system is provided to expose a surface of the lens for condensing the light beam on the recording surface, the surface facing the recording surface, and the moving optical system is connected to the fixed optical system when the moving optical system does not scan the recording surface. An optical recording / reproducing apparatus, wherein: the flexible member is fitted, and the flexible member blocks a fitting gap between the fixed optical system and the movable optical system and slides the lens. 4. The optical recording apparatus according to claim 1, wherein a fitting section between the movable optical system and the fixed optical system during non-scanning forms a closed section. Playback device. 5. A moving optical system movable along a recording surface of a recording medium, and a moving optical system disposed at a position separated from the moving optical system.
An optical recording / reproducing apparatus, comprising: a fixed optical system having a light source therein; and a moving optical system driving unit that moves the moving optical system in a direction toward and away from the fixed optical system. Either of the moving optical systems, at a position where these two optical systems oppose each other, has an opening that allows these two optical systems to be fitted to each other, and when the moving optical system does not scan the recording surface An optical recording / reproducing apparatus having control means for controlling the moving optical system driving means so as to move the moving optical system in a direction in which the moving optical system and the fixed optical system are fitted to each other.