JPS63200320A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize the simultaneous ON-track of two optical beam spots, by inclining a carriage for its guide rail centering the optical axis of an objective lens in a plane in parallel with an optical disk, in an optical information recording and reproducing device of two beams. CONSTITUTION:An optical head 11 equipped with the objective lens 10 and the carriage 12 are integrated, and are loaded on guide rails 13 and 13' which guide them in a direction of track access. In such state, a bearing supporting plate 21 which supports one side of bearings 17''-17'''' in the plane is parallel with the optical disk 14 is rotated and adjusted centering the rotational center axis 16'' of the objective lens 10, and after that, it is fixed with screws 16 and 16'. At this time, the bearing on the other side is pressed with a pre-load spring 15 on the guide rail 13. By applying such adjustment, it is possible to realize the ON-track of the two optical beam spots 19 and 19' on the track 20 of the optical disk 14 with accuracy <=0.05mum.

Description

[Detailed Description of the Invention] [Summary] An optical information recording and reproducing device that records and reproduces information by focusing two or more light beam spots on an optical disk, and which is integrated with the optical head. By making it possible to tilt the carriage with respect to the guide rail that guides it in the track access direction within a plane parallel to the optical disk, centering on the optical axis of the objective lens of the optical head,
It is possible to adjust the two beams so that they are on track.

[Industrial application field]

The present invention relates to an optical information recording and reproducing apparatus, and more specifically, to an optical information recording and reproducing apparatus that records and reproduces information by simultaneously on-tracking two or more beam spots.

(Prior Art) As shown in FIG. 2, a conventional 2-beam type optical information recording/reproducing apparatus has a carriage 2 on which an optical head 1 is rotatably mounted. It is supported so that it can move in the track access direction, and is driven by a motor 5.

[Problem that the invention seeks to solve]

In the above-mentioned conventional optical information recording and reproducing apparatus, the positions of the two beams are adjusted to some extent in order to bring the two light beam spots 6.6' onto track at once, but the off-tracking of the optical disc is at most 0. Only 0.05 μm is allowed. Therefore, when the optical head 1 is attached to the carriage 2, the head 1 is rotated about the optical axis of the objective lens 7 to adjust so that the two beam spots 6 and 6' are on track.

However, in this structure, the optical head 1 and the carriage 2
Since the two parts are separated, the rigidity of the two parts cannot be improved, which has the drawback of causing errors especially when performing high-speed access.

The present invention was created in view of these points, and provides an optical information recording/reproducing device in which an optical head and a carriage are integrated, and the on-track of two light beam spots can be easily adjusted. is intended to provide.

[Means for solving problems]

Therefore, in the present invention, as illustrated in FIG.
It is equipped with an optical disc 11 and a carriage 12 that moves the optical head 11 in the track access direction, and the optical head 11 focuses two or more light beam spots on the optical disc 14 at a time to record and record information. In an optical information recording and reproducing apparatus that performs reproduction, the optical head 1''1 and a carriage 12 are integrated, and an objective lens is mounted in a plane parallel to the optical disk 14 with respect to a guide rail 13 that guides the carriage 12 in the track access direction. The device is characterized by being equipped with a mechanism that allows it to be tilted around the 10 optical axes.

[For production]

The carriage 12 integrated with the optical head can be tilted about the optical axis of the objective lens 10 in a plane parallel to the optical disk 14 with respect to the guide rail 13 that guides it in the track access direction. It becomes possible to adjust the beam spots so that they are on track at the same time.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention, in which a is a perspective view;
b is a plan view.

In this embodiment, as shown in the first part, an optical head 11 having an objective lens 10 and a carriage 12 are integrated, and furthermore, an optical disk 14 is connected to guide rails 13 and 13' that guide the carriage 12 in the track access direction. Bearings 17'' to 1 on one side allow sliding in a direction perpendicular to the optical axis of the objective lens 10 in parallel planes.
The bearing support plate 21 supporting the rotation center shaft 16
After rotating and adjusting the fixing screws 16 and 1
6', and the bearing on the opposite side is pressed against the guide rail 13 by a preload spring 15. Note that the carriage 12 is driven by a drive motor 18.

In this embodiment configured in this way, the bearing support plate 21
By tilting and adjusting the carriage 12 and the optical head 11, the two optical beams 4-19,
19' to track 20 of optical disk 14 by 0.05 μm.
It is possible to on-track with the following accuracy. Generally, the angle required for this angle adjustment is about 0.5', and although the figure shows a large angle adjustment, it is not necessary to tilt this much. Further, in this embodiment, by integrating the optical head and the carriage, the number of device components is reduced by one, and the movable part can be made highly rigid, so that errors do not occur even during high-speed access.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to adjust the positions of two light beam spots with an extremely simple configuration, and there is no problem even during high-speed access, which is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing main parts of a conventional optical information recording/reproducing apparatus. In FIG. 1, 10 is an objective lens, 11 is an optical head, 12 is a carriage, 13, 13' are guide rails, 14 is an optical disk, 15 is a leaf spring, 16, 16' are fixing screws, 17, 17', 17 " , 17"', 17"
17~ are bearings, 18 is a drive motor, 19 and 19' are light beam spots, 20 is a track, and 21 is a bearing support plate. Fig. 2 shows a conventional optical information recording/reproducing device.

Claims (1)

[Claims] 1. An optical head (11) and a carriage (12) that moves the optical head (11) in a track access direction, the optical head (11) directing two or more light beams at a time. In an optical information recording and reproducing device that records and reproduces information by focusing a spot on an optical disk (14), the optical head (11) and a carriage (12) are integrated, and the carriage (12) is tracked. The optical disc (1
4) An optical information recording/reproducing device characterized by being provided with a mechanism capable of tilting an objective lens (10) of an optical head (11) about the optical axis within a plane parallel to the above.