JPS6396747A - Optical recorder - Google Patents

Abstract

PURPOSE:To improve the accuracy of condensing, and that of landing position of an optical beam, by providing belt-shaped recording areas of plural channels along the traveling direction of an optical recording medium, on the medium, and forming the optical beam modulated for each belt-shaped recording area so as to cross the belt-shaped recording area in a width direction. CONSTITUTION:Plural belt-shaped recording areas ER1-ER4 are formed so as to be arranged in the width direction, in the optical recording medium 11, and also, the width of each of the belt-shaped recording areas ER1-ER4 is selected as the one having a considerably small width. Therefore, by forming a recording track TR for the width direction of each of the recording areas ER1-ER4, the track length of the said track TR considerably goes to a small value in practical use. Then, when optical heads HD1-HD4 scan the said short track lengths, it is possible to reduce the range of the optical deflection angle of the optical beam considerably in practical use. In such a way, it is possible to improve further the accuracy of the condensing, and that of the landing position of the optical beam with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to an optical recording device, and is particularly suitable for application to an information recording device that records information on a tape or card-shaped optical recording medium using an optical head device. .

B. Summary of the Invention The present invention provides an optical recording device configured to record optical information on a tape or card-shaped recording medium, in which a plurality of strip-shaped recording areas formed along the running direction of the optical recording medium are By scanning a plurality of light beams using a scanning means driven by a common drive source, a recording pattern of a predetermined format can be easily formed with a simple configuration.

C. Prior Art Conventionally, this type of information recording device was disclosed in Japanese Patent Application Laid-Open No. 61-347.
A structure disclosed in Japanese Patent No. 40 has been proposed.

This conventional information recording device reflects the light beam emitted from the semi-dead laser on one surface of a quadrangular pyramidal mirror fixed on the rotation center of a rotating drum, and directs the reflected light to each pyramidal surface. It is configured to form an image on a tape or card-shaped optical recording medium that is wound diagonally around the outer circumference of the rotating drum using four objective lenses provided on the rotating drum at angular intervals of 90 degrees. ing.

D Problems to be Solved by the Invention As shown in FIG. A series of recording tracks 2 (2A to 2D) are formed so as to be sequentially arranged in the running direction at a pitch corresponding to the running speed of the optical recording medium 1.

However, in this case, since each recording track must be formed over an optically wide range so as to cross almost the entire width of the optical recording medium 1, the light emitted from the optical information source must be In practice, it is difficult to construct a structure that scans while forming an image with high accuracy.

According to the configuration disclosed in Japanese Patent Application Laid-Open No. 61-34740 mentioned above, the optical system from the optical information source to the optical recording medium 1 is mounted on a rotating drum that rotates at a relatively high speed. Therefore, it is unavoidable that the structure of the rotating drum becomes large, and since a large centrifugal force acts on the optical system such as the objective lens, it is difficult to stably condense the light beam onto the optical recording medium 1. This is extremely difficult in practice.

The present invention has been made in consideration of the above points, and by reducing the track length of the recording track to be formed on the optical recording medium as much as possible, the light beam is stably emitted through a relatively simple optical system. In addition to being able to focus light on a recording medium, in particular recording tracks for multiple channels on an optical recording medium,
The present invention attempts to propose an optical recording method that can reliably form a recording pattern having a predetermined format.

E Means for Solving Problem E In order to solve this problem, in the present invention, a plurality of strip-shaped recording areas ERI to E-R4 are formed along the running direction X of the tape or card-shaped optical recording medium 11. A scanning means REF driven by a common driving means sends a plurality of light beams L1 to L4 emitted from a plurality of optical head bodies HDI to HD4 respectively provided for the plurality of strip-shaped recording areas ERI to ER4. The recording track TR is formed by scanning the corresponding strip-shaped recording areas ERI to ER4 across the width direction thereof.

A plurality of strip-shaped recording regions ERI-ER4 are formed in the F-action optical recording medium 11 so as to be lined up in the width direction thereof, and the width of each strip-shaped recording region ERI-ER4 is selected to be sufficiently small. . Therefore, when a recording track TR is formed in the width direction of each recording area ERI to ER4, the track length of the recording track TR becomes a sufficiently small value for practical use.

Therefore, the optical head bodies HDI to HD4 can make the optical deflection angle range of the light beam sufficiently small for practical use when scanning the short track length.

Thus, according to the present invention, it is possible to further improve the focusing accuracy of the light beam and the landing position accuracy with a simple configuration.

In addition, by deflecting and scanning the plurality of light beams Ll to L4 by a common driving means, recording tracks TR on the plurality of strip-shaped recording areas ERI to ERd are
It is possible to easily realize an optical recording device in which the recording pattern of the optical disc can be easily adjusted to a predetermined format, and thus the recorded signal can be reproduced with good reproducibility.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) Embodiment In FIG. 1, 11 is an optical recording medium, and an optical head device gHD that emits a plurality of light beams L1, L2, L3, and L4 for a plurality of channels, for example, is provided to face the optical recording medium 11. strip-shaped recording areas ERI for four channels arranged along the running direction X of the optical recording medium 11 and in the width direction;
ER2, ER3, and ER4 are formed.

As shown in FIG. 2, the optical head device HD has first and second
, optical head main body HDI for 3rd and 4th channels, HO
2, HO2, HO4, each optical head body HDI, H
O2, HO2, and HO4 each optically modulate a laser beam generated from a laser light source (for example, a semiconductor laser) by a modulation signal made of digital data by an optical modulation element, and rotate the optically modulated light beam as a scanning means. Deflected by the reflector REF, the objective lenses M1, M
2, the corresponding recording areas ERI and ER through M3 and M4
2. Light beams L1, L2, L3, L on ER3, ERd
It is designed to condense light as 4.

The rotating reflector REF is rotationally driven in the direction of the arrow a by the rotary drive device 12 at a predetermined speed, so that the light beams L1, L2,
As shown by the arrows L3 and L4, the optical recording medium 1
Deflection scanning is performed in a direction diagonally crossing the running direction X of No. 1.

Thus, while the light beams L1, L2, L3, L4 are in the field of view of the objective lenses M1, M2, M3, M4, the strip-shaped recording area ER corresponding to the light beams L1, L2, L3, L4 is
A recording track TR is formed to cross I, ER2, ER3, and ER4 from one end side to the other end side.

In this embodiment, one recording track TR is created by scanning the light beams L1, L2, L3, and L4 from one end of the recording areas ER1, ER2, ER3, and ER4 to the other end.
After the recording track TR is formed, the next recording track TR is again formed from one end side to the other end side by switching the reflecting surfaces formed by the front and back surfaces of the rotary reflecting plate REF.

According to the configurations shown in FIGS. 1 and 2, the track lengths of the recording tracks ERI to ER4 of each channel are selected to be a sufficiently small value for practical use (for example, about 1 [crane]). HDI, HO2, HO2, HO4
The optical deflection angles of the light beams L1, L2, L3, and L4 emitted from the light beams can be limited to a sufficiently small value for practical use.

Therefore, the light beam L1 scanning the small deflection angle range,
In order to condense the light beams L2, L3, and L4 onto the recording medium 11, it is practical to fix the objective lenses M1, M2, M3, and M4, so that the light beams L1, L2, L3, and L4 can be focused on the optical recording medium 11. The above-mentioned light focusing accuracy and landing position accuracy can be improved, and thus high-density recording can be easily realized.

Incidentally, when the optical recording medium 1 is scanned by a sufficiently long series of recording tracks 2A to 2D as in the conventional configuration shown in FIG. 3, the optical deflection angle of the modulated light beam must be considerably large. As a result, the objective lens must be configured to move significantly in synchronization with the movement of the light beam, so that it is possible to avoid deterioration in the focusing accuracy or landing position accuracy of the light beam. However, if the structure is as shown in FIGS. 1 and 2, this problem can be effectively solved.

In addition to this, according to the above configuration, a plurality of light beams L1
, L2, L3, and L4 all at once in the corresponding recording area ER by a rotating reflector REF provided as a common scanning means.
By scanning I, ER2, ER3, and ER4, the recording pattern of the track TR on the plurality of recording areas ERI to ER4 can be easily adjusted to a predetermined format.

Incidentally, it may be possible to scan the plurality of light beams L1 to L4 without synchronization using separate scanning means, but if this is done, each recording area ERI to
Although there is a possibility that the recording pattern will not match the predetermined format due to a shift in the scanning timing of the recording track TR of ER4, the above-described configuration can effectively avoid such a possibility.

(G2) Other embodiments (1) In the embodiments described above, the light beams L1 to L
A rotating reflector RE is used as a scanning means for simultaneously deflecting and scanning the
Although the case where F is used has been described, various deflection means can be used instead, such as using a polygon mirror or using an ultrasonic deflection element whose deflection amount is controlled by a scanning signal.

(2) In the above-described embodiment, when forming the modulated light beams L1 to L4 on the recording areas ERI to BRA, the modulated light beams L1 to L4 are formed so as to cross the width direction from one end of the recording area ERI to the other end of the recording area ERI to the other end. Although the configuration is configured to form a large number of almost parallel recording tracks by repeating the scanning that forms the tracks of the book, instead of this, modulated light beams L1 to L4 are transmitted from one end side of the recording areas ERI to ER4 to the other. After scanning to one end, the following recording track is formed by turning back from the other end to one end, and the same effect as described above can be obtained even if the recording track is formed so that the operation is repeated sequentially. Obtainable.

(3) In the above embodiment, the present invention was applied when recording digital data on the optical recording medium 11, but
It can be similarly applied to the case of recording analog signals.

(4) In the above embodiment, a plurality of light beams L1 to
Although one scanning means is provided in common for L4, instead of this, a plurality of scanning means (for example, a rotating reflector, a polygon mirror, an ultrasonic deflection element, etc.) corresponding to each of the light beams L1 to L4 are provided. Even if a plurality of scanning means are provided and driven simultaneously and synchronously by a common driving means (for example, a cam means, a synchronous signal processing means, etc.), the same effect as in the above case can be obtained.

H Effects of the Invention As described above, according to the present invention, strip-shaped recording areas for a plurality of channels are provided on the optical recording medium 11 along the running direction thereof, and a light beam modulated for each strip-shaped recording area is provided. By forming the band-shaped recording area across the width direction thereof, the optical deflection width of the modulated light beam can be made sufficiently small for practical use.
Thus, the light beam focusing accuracy and landing position accuracy can be improved with a simple configuration.

In addition, by deflecting and scanning the plurality of light beams L1 to L4 by a common driving means, recording tracks TR on the plurality of strip-shaped recording areas ERI to ER4 can be
It is possible to easily realize an optical recording device in which the recording pattern of the optical disc can be easily adjusted to a predetermined format, and thus the recorded signal can be reproduced with good reproducibility.

[Brief explanation of the drawing]

1 and 2 are a schematic plan view and a perspective view showing the structure of a recording section used in an embodiment of the optical recording apparatus according to the present invention, and FIG. 3 is a schematic diagram showing a conventional recording pattern. 1.11... Optical recording medium, 2, TR...
・Recording track, HD... Optical head device, HD
I~HD4...Optical head body, M1~M4...
...Objective lens, ERI to ER4... Recording area. Conventional recording pattern Fig. 3

Claims (1)

[Claims] A plurality of strip-shaped recording areas are formed along the running direction of a tape or card-shaped optical recording medium, and light is emitted from a plurality of optical head bodies provided respectively for the plurality of strip-shaped recording areas. A plurality of light beams are scanned across the width direction of the corresponding strip-shaped recording area using a scanning means driven by a common driving means, thereby forming a recording track. An optical recording device characterized by: