JPS6292247A - Optical information recording and reproducing method - Google Patents

Abstract

PURPOSE:To attain the reproduction just after recording by dividing the output light of a light emitting element into two to form the 1st and 2nd spots, using the 1st spot to record information on a track and using the 2nd spot to reproduce the information recorded by the 1st spot. CONSTITUTION:A photoelectric transducer 20 converts the output light of a light emitting element 2 into an electric signal and inputs the result to a signal processing circuit 15. A splitter 21 divides the output light of the element 2 into two and a diffraction grating or a beam splitter is used. The 2nd spot 22 is converged to the recording face of an optical disc 1 by a condenser lens 5 and irradiated on the same circle as that of the 1st spot 18. A photoelectric transducer 23 is provided in parallel with the 1st photoelectric transducer 8 and the reflected light of the spot 22 from the optical disc 1 is converted into an electric signal. A divider 24 divides the output of the element 23 by the output of the element 24, a data read circuit 25 receives the output of the divider 24 of convert it into a code data. In using the spot 18 to record information on the track 1a of the disc 1 the spot 22 reproduces the information recorded on a pit 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recording and reproducing optical information that allows the recording surface of an optical disc to be inspected after information has been recorded.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional optical disk device. In the figure, (1) is an optical disk provided with concentric or spiral guide tracks to enable recording of information, and (2) is an optical disk for recording information on the optical disk (1) and for reproducing recorded information. A semiconductor laser diode (hereinafter referred to as a light emitting element) that outputs light as a light source, (31 is a collimator that converts the light output from the light emitting element (2) into parallel light, and (4) is a collimator that converts the light outputted by the light emitting element (2) into parallel light. A beam splitter (5) splits parallel light onto the recording surface of the optical disc (1) and reflects it, and transmits the light reflected by the optical disc (1).
), and (6) is a half mirror that splits the light reflected by the optical disk (1) and transmitted through the beam brick (4) into first light and second light.
1 (7) is a condenser lens that focuses the first light, and (8) is a photoelectric conversion element that converts the focused first light into an electrical signal, which converts the focused light, track deviation, and data signal. To detect. (9) is a processing circuit that receives the electric signal from the photoelectric conversion element (8) and reproduces the data signal and corrects the track deviation; (+01 is a tracking actuator for correcting the track deviation that operates according to the commands of the processing circuit (9)) , (+1)
(+2) is a second condensing lens that focuses the second light, and (+2) is a photoelectric conversion element that converts the focused second light into an electric sign, and detects a focus shift. (+3) is a processing circuit that receives the electric signal from the photoelectric conversion element (+2) and corrects the focus shift, (14) is a focus lens actuator that operates according to the commands of the processing circuit (+3), and (+5) is an information A signal processing circuit that processes recording and playback signals, (1
0 is a rotating device that rotates the optical disk (1), (17)
is a control circuit that controls the rotation speed of the rotating device (IGI,
9) is a spot where the output light of the light emitting element (2) is focused on the recording surface of the optical disc (1).

Next, the operation will be explained. When the control circuit (r7) drives the rotating device (10) and the light emitting element (2) so that the optical disc (1) rotates at a predetermined rotational speed, the spot (b) is placed on the track of the optical disc (1). Tracking control and focus lens control are performed so that the light is focused at the center, making it possible to record information on the optical disc (1) or reproduce recorded information.

When recording (writing) information onto the optical disc (1), the signal processing circuit (15) applies modulation to the light emitting element (2) that is appropriate for recording information, and the optical disc (11) is physically or chemically The reflected light is changed and the optical output necessary to maintain that state until it is returned to its original state by adding heat or magnetism is applied, and a change commensurate with the modulated information is thermally applied to the recording surface of the optical disk (1). Alternatively, information is recorded by magnetic means. (The recorded modulated portions are called pits.) When reproducing (reading) information from the pits of the optical disk (1), the optical output of the light emitting element (2) is The light is applied to the optical disk (1) at the time of information recording (data writing), and the photoelectric conversion element processing circuit changes the reflected light to the extent that it does not change even if it is applied to the optical disk (1). , is reproduced by the signal processing circuit (15).

[Problem that the invention seeks to solve]

Conventional recording and reproduction of optical information is performed as described above, so the problem is that after information is recorded, it is necessary to wait for at least one rotation of the optical disc before recording and reproduction can be performed to check whether the recording is correct or incorrect. was there.

This invention was made in order to solve the above-mentioned problems, and aims to provide an optical information recording and reproducing method that makes it possible to reproduce recorded information after an extremely short period of time. purpose.

[Means for solving problems]

In the optical information recording/reproducing method according to the present invention, a first spot and a second spot obtained by dividing the output light of a light emitting element into two are arranged so as to irradiate the trunk with a predetermined interval. Information is recorded on a track using a spot, and the information recorded by the first spot is reproduced using a second spoiler 1-.

[For production]

The method for recording and reproducing optical information in the present invention includes recording information using a first spot having a predetermined amount of light, and recording information using a second spot having a predetermined amount of light smaller than the first spot. Play information.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the drawings and FIG. 2, (1) to (18) are the same as those of the conventional one, but for convenience of explanation, (8) is referred to as the first photoelectric conversion element, and (!8) is referred to as the first spot. 2) is a photoelectric conversion element that converts the output light of the light emitting element (2) into an electrical signal, and is connected so that the electrical signal can be input to the signal processing circuit (15). (9) represents the output light of the light emitting element (2) by 2
A diffraction grating, beam splitter, or the like is used as a spectroscopic element to split the light. (2→ is the second spot focused on the recording surface of the optical disc (1) by the condensing lens (5), and is irradiated on the same circumference as the first spot (18). (
2) is a second photoelectric conversion element arranged in parallel with the first photoelectric conversion element (8), which converts the reflected light from the optical disk (1) by the second spot (to) into an electrical signal.

i) is a divider that divides the output of the second photoelectric conversion element (23) by the output of the photoelectric conversion element (to); i) is the divider (N)
There is a data reading circuit that receives the output and converts it into code data. In FIG. 2, which is an enlarged view of the recording surface of the optical disc (1), (1a) shows a plurality of tracks provided at predetermined intervals in the radial direction and on which information is recorded by the first spots (18); e) This is the spot where information is recorded on the first rack (1a). In this way, the first spot (!8) can record information, and the second spot (to) can reproduce the information recorded by the first spot (18). , (to) the sight is adjusted.

Next, the operation will be explained. The one in Figure 1 records and reproduces information (+5) -(21-(31-(41-()
51→(18)→(1).

(11-(Ilri -+51- (41-+61- (
71-(81-f91→(15) path, focus control is (1)→(18)→(5)→(4)→(6)→(1)
The path of 1) → ((2) → (13) - (+4>), track rack control is (11 → (!8) → (5) → (4) → [61-
The path (71-f81→(9)-〇〇) and the rotation opening of the disc are carried out along the path (7)→(II,)→(11) as in the past, so the explanation will be omitted.

When information is recorded on the track (1a) of the optical disc (1) by the first spot (18), as shown in the figure, a second spoiler I following the first spot (58)
- In (22), the information recorded in the pit (E) is reproduced. The reproduced signal by this second spot (2) converts the output light of the light emitting element (2) into an electrical signal so that the first spot (18) is not affected by the pulsed light when recording information. The output of the converted photoelectric conversion element is subjected to division processing and converted into code data by a data reading circuit. This code data is compared in the signal processing circuit (15) with the information commanded to be recorded in the first spora (Qs), and it is determined whether the reproduced information is correct or incorrect.

When an error in the information recorded by the first spot (18) is detected during reproduction of the recording by the second spot (to), the signal processing circuit (15) issues an information correction command, and if there is uncorrectable information, the signal processing circuit (15) issues an information correction command. If so, a command is output to record the information in another sector or another track.

Note that when the first spot (18) is used for reproducing information, the second spot (to) is paused.

〔Effect of the invention〕

As described above, according to the present invention, information recorded at a first spot is reproduced at a second spot placed at a predetermined interval from the first spot, and whether the recorded information is correct or incorrect is determined. By detecting and performing predetermined processing, it can be expected that the reliability of information recording will be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a partially enlarged view of an optical disc, and FIG. 3 is a block diagram showing a conventional one. In the figure, (1) is an optical disk, (1a)
is a track, (2) is a light emitting element, (18) is a first pulley, (2) is a spectroscopic element, and (to) is a second spot. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a method of recording and reproducing optical information by irradiating a focused spot of the output light of a light emitting element onto a track of an optical disk, the output light of the light emitting element is divided into two, and a first spot and a second spot are used. An optical information recording method characterized in that a spot is formed, the first spot records information on the track, and the second spot reproduces the information recorded on the track by the first spot. How to play. (2) The recording of optical information according to claim 1, characterized in that the second spot is irradiated on the same track as the first spot with a predetermined interval from the first spot. How to play.