JPS61104338A - Optical information recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information input/output terminal device, and particularly to a recording/reproducing device suitable for using an optical method.

[Background of the invention]

Conventionally, optical disc master recording and cutting devices that have large light sources such as gas lasers, such as those described in the above-mentioned document, have large optical systems as a whole, and in order to achieve precise positioning, it is necessary to reduce the weight of the movable parts. The optical system had to be separated in order to achieve this, and since these systems focused on positioning accuracy, access speed was not considered.

[Purpose of the invention]

The purpose of the present invention is to reduce the size and weight of the movable part by separating the optical system into a movable side and a fixed side, thereby shortening the access time and providing optical information that can be adjusted relatively easily due to the separation. To provide recording/playback devices.

[Summary of the invention]

When the optical axis of the optical system is shifted, rotation θ around each of the three orthogonal x, y, and z axes. , θ2. Although it is possible to consider the θ2 direction, it is necessary to precisely adjust the x, z, and 08 directions, which are particularly likely to generate offset signals in the detection system.

The present invention separates the optical system into a movable part and a fixed part.

The optical head can be made smaller and lighter by using only the drive mechanism (Ia) that corrects focus and track misalignment as a movable part, and an m alignment end is provided to align the optical axes of the movable part and the fixed optical system. This is an optical information recording/reproducing device characterized by the following.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a conceptual diagram of an optical disk device signal detection section. The optical system for writing and reading signals on the disk l is separated into a movable optical head 2 and a fixed optical system 6.

The movable optical head 2 is supported on a rail 18 by a bearing 5, and a movable mirror 4 and a movable objective lens 3 are mounted thereon. The fixed optical system 6 includes a light source, a detector, etc., and the light beam 100 emitted from the light source passes through the movable optical head 2, irradiates the disk 1, and passes through the same path to be detected by the detector within the fixed optical system 6. Ru.

In this configuration, since the optical system is separated into two parts, if the mutual positional relationship deviates, an offset will occur in the detection signal.This adjustment is performed by the adjustment table fixed part 8 and the adjustment table movable part 7. Figure 2 shows the details. Optical system mounting stand 9
is held within the adjustable table movable part 7 by a leaf spring 10 and an adjusting screw 11. Movement in the Z-axis direction is performed by adjusting the adjustment screw 11-d together with the adjustment table movable section 7. Movement in the X-axis direction is performed using the adjustment screw 11-a, rotation around the Z-axis is performed using the adjustment screw 11-b, and rotation around the X-axis is performed using the adjustment screw 11-.
Do it by 〇. At this time, since the movement of the - axis does not change the attitude of the other axes, movement of a total of four axes is performed without mutual interference.

Therefore, according to this embodiment, since the optical axis can be easily set, the assembly of the optical disk device can be simplified.

Another embodiment of the present invention will be described with reference to FIG.

In FIG. 3, a prism 12 is newly used to align the optical axes of the fixed optical system and the movable optical head 2. In FIG. The light emitted from the semiconductor laser 7 is emitted through a lens 16, a prism 15, a beam splitter 4, and a wavelength plate 13, but a prism 121 is used to align the optical axis with the optical axis of the movable optical head. I am using it. According to this, adjustment in the 08 direction is possible without changing the fixed optical system after adjustment, and there is an effect that positioning is facilitated. In addition, FIG. 4 shows the same effect as the prism using two glass plates 12-a,
The third method was realized by inserting a highly viscous fluid 12-b between 12-c and moving one of the plates 12-b.
This is an example. FIG. 5 is a partial diagram showing a fourth embodiment, in which the optical axis is adjusted by adding a rotation mechanism to the prism 15 on the semiconductor laser 17 side instead of the prism 12 used in the embodiment of FIG. It is something to tighten.

FIG. 6 shows a fifth embodiment, in which the optical system has a semiconductor laser 7, a lens 16, a beam splitter 14, and a wavelength plate 13 on the output side, and a beam splitter 4 is connected to the output side. By adding a moving mechanism, the optical axis can be aligned with the movable optical head 2.

〔Effect of the invention〕

According to the present invention, since adjustments can be easily made during assembly, the dimensional accuracy of each component can be made coarser, and it is also possible to provide a configuration in which the detection signal can be detected with high accuracy. Therefore, there is an effect that the detection signal can be stabilized.

[Brief explanation of drawings]

Figure 1 is a side view of the overall configuration, Figure 2 is a detailed perspective view of the adjustment mechanism shown in Figure 1, Figure 3 is a side view of another embodiment, and Figure 4 is a side view of the overall configuration.
The figure is a partially enlarged view of the third embodiment. FIG. 5 is a partial configuration diagram of the fourth embodiment, and FIG. 6 is a side view of the fifth embodiment. ■... Disc, 2... Movable optical head, 3...
Movable objective lens, 4... Movable mirror, 5... Bearing, 6... Fixed optical system, 7... Adjustment table movable part, 8...
・Adjustment table fixing part, 9... Optical system mounting base, 10... Leaf spring, 11... Adjustment name splitter, 15... Prism, 16... Lens, shoulder 1 [Zl δ flat 2 lo 'fJ3 Figure MS Figure

Claims (1)

[Claims] In devices that optically record and reproduce information, the optical system is separated into a movable part and a fixed part, and the only movable part is the drive mechanism that corrects defocus and track misalignment. 1. An optical information recording/reproducing device characterized by being provided with an adjustment mechanism for aligning optical axes of the two.