JPS61175937A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a reaction force from being applied directly to an optical system housing, by providing the optical system housing provided with an actuator for driving an objective lens and at least a light source and a photodetector, and a movable body for holding independently the actuator and the optical system housing, respectively. CONSTITUTION:A focusing error signal and a tracking error signal are detected by a photodetector, and based on its error signal, an objective lens 1 is driven by an actuator 2, and focusing control and tracking control are executed. Also, a beam access to a desired track on a disk 7 is executed by moving a movable body 4. In such a way, the actuator 2 and an optical system housing 3 are separated independently, respectively, and installed to the movable body 4. In such a way, a reaction force of the time when the focusing control and the tracking control are executed by driving the objective lens by the actuator 2 is absorbed by the movable body 4, and it is not transmitted directly to the optical system housing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention focuses a light source such as a laser onto a desired position on a disk-shaped information recording medium (hereinafter referred to as a disk) to record, for example, image or audio information. Or it relates to an optical recording and reproducing apparatus for reproducing.0 Prior Art Conventional optical recording and reproducing apparatuses include, for example,
Figure 2 is a plan view of a conventional optical recording/reproducing device, and Figure 3 is a front view. Figure 4 is a front view of a conventional optical recording/reproducing device. It is a block diagram of a system.

1 is an objective lens, 2 is an actuator that drives the objective lens 1, 3 is an optical system housing, and 4 is a radial direction x of a disk 7 that holds the actuator 2 and the optical system housing 3.
It is a movable body that can move in x direction.

This actuator 2 is mounted directly on the optical system housing 3.

Further, 6 is a bearing, and 6 is a guide shaft, which constitutes a support mechanism when the movable body 4 moves.

Further, the inside of the optical system housing 3 is shown in FIG.

8 is a semiconductor laser, 9 is a collimator lens, 10 is a half mirror, 111 is a detection lens, and 12 is a photodetector.

The operation of this conventional example will be explained below.

The beam emitted from the semiconductor laser 8 is converted into parallel light by a collimator lens 9, and is made parallel to the actuator 2 by a half mirror 10. This parallel light is focused into a minute beam by the objective lens 1 and irradiated onto the disk 7 . The reflected light from the disk 7 passes through the objective lens 1 , the half mirror 10 , and the detection lens 11 and enters the photodetector 12 . This photodetector 12 detects a focusing error signal and a tracking error signal. Based on the error signal, the actuator 2 drives the objective lens in the z and z directions to perform focusing control, and drives it in the xx force direction to perform tracking control. Further, access to a desired track on the disk is performed by moving the movable body 4 in the xx force direction.

Problems to be Solved by the Invention However, in the above configuration, when the objective lens 1 is driven in the ZZ direction or the xx force direction by the actuator 2 for focusing control or tracking control, the reaction force is generated by the optical system housing. It will be added directly to body 3.

As a result, the optical axis of the semiconductor laser 8 fluctuates due to the vibration due to the mechanical resonance of the optical system housing 3, and the beam control characteristics and recording/reproducing characteristics deteriorate. Alternatively, the photodetector 12 may vibrate, deteriorating beam control characteristics and recording/reproducing characteristics.

Furthermore, there is a problem in that beam control characteristics and recording/reproducing characteristics are similarly deteriorated due to vibration of the entire optical system housing 3.

Furthermore, there is another problem in that the attachment of optical components within the optical system housing 3 becomes loose due to reaction force during focusing control and traversing control of the actuator, resulting in deterioration of control characteristics and recording/reproducing characteristics.

The present invention solves these conventional problems, and eliminates the occurrence of mechanical vibration in the optical system housing due to the reaction force of the actuator during focusing control or tracking control, and the control characteristics and recording caused by loosening of the attachment of optical components. It is an object of the present invention to provide an optical recording and reproducing apparatus that prevents deterioration of reproduction characteristics. The present invention is an optical recording/reproducing device including an optical system housing having a radial direction, and a movable body that is movable in the radial direction of the disk and independently holding the actuator and the optical system housing.

Effects of the present invention The actuator that drives the objective lens and the optical system housing that includes at least a light source and a photodetector are independently attached to a movable body that can move in the disk radial direction, so that the actuator performs focusing control and It is possible to prevent reaction force during tracking control from being directly applied to the optical system housing.

Therefore, it is possible to prevent deterioration of control characteristics and recording/reproduction caused by mechanical vibration of the optical system housing and loosening of optical components caused by direct application of the reaction force by the actuator to the optical system housing.

Embodiment FIG. 1 shows a front view of an optical recording/reproducing apparatus according to an embodiment of the present invention. Reference numerals 1 to 7 in FIG. 0 are the same as those in FIG. 3. Here, the actuator 2 and the optical system housing 3 are each independently attached to a movable body 4, and the movable body 4 is provided with a through hole 41 so that the original beam can pass therethrough.

Further, inside the optical system housing 3, optical components such as a semiconductor laser 8 and a photodetector 12 are provided, similar to those shown in FIG.

The operation of this embodiment will be explained below.A focusing error signal and a tracking error signal are detected by the zero-source detector 12.Based on the error signals, the objective lens 1 is fully driven by the actuator 2 to perform focusing control and tracking. Control 0 Furthermore, beam access to a desired track on the disk 7 is performed by moving the movable body 4.

As described above, according to this embodiment, the actuator 2 and the optical system housing 3 are attached to the movable body 4 separately and independently.

Therefore, when the objective lens 1 is driven by the entire actuator 2 to perform focusing control and tracking control, the reaction force is absorbed by the movable body 4 and is not directly transmitted to the optical system housing 3.

Therefore, the reaction force of the actuator 2 does not cause deterioration of the control characteristics and recording/reproducing characteristics due to loosening of the attachment of the mechanical resonance 1 optical component of the optical system housing 3.

In this embodiment, the cross-sectional shape of the movable body 4 is YL-shaped, but the actuator 2 and the optical system housing 3 can be attached separately and independently without being limited to this cross-sectional shape. As long as the structure is capable of absorbing the reaction force during focusing control and tracking control of the actuator 2, the same effects as in this embodiment can be obtained.

As described in detail, according to the present invention, it is possible to prevent reaction force from being directly applied to the optical system housing during focusing control and tracking control of the actuator 2.

Therefore, it is possible to provide an entire optical recording and reproducing apparatus in which deterioration of control characteristics and recording and reproducing characteristics due to loosening of the mechanical resonance 1 optical component attached to the optical system housing is prevented.

[Brief explanation of drawings]

FIG. 1 is a front view of an optical recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of a conventional optical recording/reproducing apparatus, FIG. 3 is a front view of the conventional example, and FIG. is a configuration diagram of an optical system of the conventional example. DESCRIPTION OF SYMBOLS 1... Objective lens, 2... Actuator, 3... Optical system housing, 4... Movable body, 7... Disc. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure f...
・ Pair] Of course 2... Actuator 3... Optical light forest 4... 4 dragon θ 2 pieces 7... Disc figure 2

Claims (1)

[Claims] an actuator that drives an objective lens; an optical system housing that includes at least a light source and a photodetector; An optical recording/reproducing device characterized by having a body.