JPS5965948A - Recording and reproducing method - Google Patents

Abstract

PURPOSE:To execute effectively and at a high speed recording and reproducing by executing simultaneously recording and reproducing to and from plural recording tracks by use of a semiconductor laser array and a photoelectric converting element array. CONSTITUTION:Information transferred at a high speed is divided into three buffer memories once, is stored, and subsequently, is read out simultaneously at a low speed, and each laser of a semiconductor laser array 11 is driven independently, respectively. Three luminous fluxes of the laser array 11 are condensed by the same condensing leans 12, and a recording track group 14 is formed simultaneously. a photoelectric converting element array 21 is placed at a position of the laser array 11, receives a reflected ray from the recording track group 14 illuminated by a light source 20, and reads out independently and simultaneously each information which is divided and recorded in plural recording tracks. This signal is stored in three buffer memories once, and it is read out at a high speed and is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording and reproducing method for video discs, magneto-optical discs, etc., and more particularly to a recording and reproducing method that allows high-speed data transfer.

In recent years, instead of recording and reproducing using magnetic heads, methods of optically recording or reproducing information by irradiating light onto a photosensitive recording medium have attracted attention due to its high recording density and non-contact nature. has been done. An outline of such a recording/reproducing method is shown in FIG.

In FIG. 1, a light source such as a 1-Mori semiconductor laser.

2 company condensing lens, 6 is a photosensitive recording medium, and 4 is a recording track. Information V, l is sent to the light source 1 as a recording signal,
The light modulated based on the recording signal is focused on the photosensitive recording medium 3 by the condensing lens 2, and when the body is rotated to record ρ, it is recorded as a recording track 4 from K. Further, when reading information, the photosensitive recording medium 6 is irradiated with light, and the reflected light from the recording track 4 is received by a photoelectric conversion element or the like to perform reproduction.

However, in the above method, even if the information transfer speed is increased in order to perform high-speed recording and reproduction, there are limitations such as the rotational speed of the recording medium or the recording linear density, and it is not easy to increase the speed of recording and reproduction.

A purpose L of the present invention is to provide a recording and reproducing method that solves the above-mentioned problems and enables high-speed recording and reproducing.

The present invention drives a plurality of integrated semiconductor lasers independently of each other according to a recording signal, simultaneously records information on a plurality of recording tracks of a photosensitive recording medium, and also integrates the information recorded on the plurality of tracks. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings, which achieves the above object by a recording and reproducing method that simultaneously reads data using a plurality of photoelectric conversion elements.

FIG. 2 (the gradient indicates an embodiment of the recording method according to the present invention) is a schematic diagram.
indicates a recording track group. Here, the information transferred at high speed is once divided and stored in six buffer memories (not shown), and these divided information are simultaneously transferred at low speed.
[Based on these signals, the individual lasers in the semiconductor laser array 110 are driven independently of each other.

The six beams emitted from the semiconductor laser array 11 are condensed by the same condensing lens 12, and
Three beam spots are formed approximately in the radial direction. At this time, the recording track group 14 is formed by rotating the photosensitive recording medium 16. As described above, the method of the present invention allows information to be recorded simultaneously on a plurality of tracks, thereby greatly increasing the recording speed. Furthermore, in this embodiment, a semiconductor laser array is used, and the optical projection images of the individual semiconductor lasers are not aligned in the direction of the recording track, that is, they are projected at right angles or obliquely to the direction of the recording track. Track groups closely spaced in the radial direction of the medium can be formed. Furthermore, since the same condensing lens is used to form a plurality of beam spots, only one autofocus servo mechanism is required, which simplifies the device configuration.

FIG. 2(B) is a schematic diagram illustrating a method for reproducing information recorded as shown in FIG. 21 is a photoelectric conversion element array, and 22 is a condensing lens. Here,
The photoelectric conversion element array 21U is arranged at the position of the semiconductor laser array 11 in FIG. The information recorded in the divided tracks is read out simultaneously as multiple electrical signals independently of each other.Once stored in six buffer memories (not shown) K of these multiple signals, they are read out in sequence at high speed. , information is reproduced. In the above embodiment, the number of elements in the semiconductor laser array or the photoelectric conversion element array is three, but depending on this number VJ and the recording/reproducing speed requirements, 0Also, the photosensitive recording medium is in the form of a disk,
The present invention is not limited to this, and can be applied to other recording media such as tape-shaped recording media. Furthermore, the configurations of the light source, condensing lens, etc. can be modified in various ways without departing from the scope of the claims of the present invention.

For example, the light source during reproduction may be a semiconductor laser array corresponding to the photoelectric conversion element array, and may be configured to separately illuminate each recording track.

As explained above, the present invention effectively achieves high-speed recording and reproduction by simultaneously recording and reproducing information on a plurality of recording tracks using a semiconductor laser array and an optical/electric conversion element array in a conventional recording/reproducing method. It enables recording and playback.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining a conventional recording/reproducing method, and FIG. 2 is a schematic diagram for explaining an embodiment of the recording/reproducing method of the present invention. 11... ...Half-cotton laser array 12.22...Condensing lens 16...Photosensitive recording medium 14...Recording track group 20...Light source 21... Photoelectric conversion element array applicant Canon Corporation

Claims (1)

[Claims] (1) A plurality of integrated semiconductor lasers are driven independently of each other according to a recording signal, information is simultaneously recorded on a plurality of recording tracks of a photosensitive recording medium, and the information recorded on the plurality of tracks is A recording and reproducing method that reads data simultaneously using multiple integrated photoelectric conversion elements.