JPS60179945A - Reproduction system of optical disk - Google Patents

Abstract

PURPOSE:To improve the recording density of an optical disk by detecting the digital information recorded on the optical disk in the form of pattern information by an optical pickup and supplying plural pieces of track information to a memory to then reading them out successively. CONSTITUTION:It is enough to detect the digital information recorded to an optical disk D by an amount equivalent at least to a block by a pinpoint detector. Thus the space between tracks is reduced less to improve the recording density. A record information pattern reflected from the disk D forms an image on a CCD10. Then clock signals phi1 and phi2 are supplied to convert the information pattern into electric signals. These electric signals are sent to a digital analyzer 14 via a multi-CH amplifier 11, a multi-CH demodulator 12 and an error corrector 11. Thus address signals corresponding to code numbers are produced and sent to memories 15a and 15b for recording. These recorded digital signals are read out successively out of the memories for reproduction. Thus the track servo is not needed since it is not required to trace just a single recording track. This improves the recording density.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method for reproducing an original disc that can generate recorded information signals of an optical disc recorded in digital signals. [Points] Optical disc playback devices that convert audio or other information into digital signals and read optical discs recorded as spiral pit information on the surface of the optical disc optically are already commercially available.

The recording density of commercially available optical discs is high, and the information recording track width is very small.
During playback, it is essential to lower the tracking servo to the pickup device.

Therefore, the conventional optical disc reproducing apparatus requires an optical mechanism for detecting tracking error No. 48, a servo circuit, and an expensive 7-actuator (two-axis mechanism) that responds to error signals.

Therefore, in an optical playback device using a conventional tracking method, the bits recorded on an optical disk lack various limitations due to tracking servo.
It is difficult to make the disc even narrower, and it also limits the ability to rotate the optical disc at higher speeds, which poses a problem in improving the recording density.

[Object of invention, target]

This invention aims to improve recording density by eliminating the concept of optical reproducing devices that employ conventional tracking methods and providing an optical disc reproducing method that can reproduce pit information on an optical disc without tracking. It is something that

[Summary of the invention]

This invention irradiates an original disc recorded with digital signals with incoherent light in a range that simultaneously includes at least a plurality of recording tracks, and creates a plurality of real images of digital signal patterns reflected from the optical disc. The structure is such that the divided photoelectric conversion elements receive light. A plurality of pieces of recorded information outputted from the photoelectric conversion element are stored at a location specified by a memory address corresponding to the code number.

Thereafter, the digital information recorded in the memory is sequentially read out and the recorded information is reproduced.

Therefore, since the recorded information on the optical disc is detected over a wide area, a tracking servo is not required.
Since it is also possible to shorten the recording track interval, the recording density can be increased. [Embodiment] Figure 2.1 is a schematic diagram showing the main equipment of this invention.

1 indicates an optical pickup device that moves in the radial direction of the original disk D by a feeding device (not shown), for example, a light emitting source 2.
Optical lens 3m for irradiating the recording surface + 3b + half mirror 4 for changing the direction of the light reflected from the optical disk D. Optical system 5. It is composed of a photoelectric conversion element 6 and the like.

As the light source 2, a light emitting diode or other incoherent light source is used.

Further, the light receiving surface of the photoelectric conversion element 6 is divided into small pieces to form a plurality of pinpoint detectors as described later.

Further, in the optical device of the present invention, the light spot irradiated with the optical disc DY has a size that irradiates at least several or several tens of recording tracks, and the reflected light of the light spot is After being reflected by the humera 4, the light is magnified by the optical system 5 and is irradiated onto the photoelectric conversion element 6.

Therefore, as shown in FIG. 2, digital information recorded in a plurality of tracks (four in the figure) is imaged as a pattern on the light-receiving surface of the photoelectric conversion element 6. The pattern of this digital information changes with each revolution of the optical disc D.

Therefore, in Fig. 2, the photoelectric conversion element is 6'%! Configuring multiple pinpoint detectors, e.g. PI*
Assuming that Pg * Pg and P4 can each sequentially detect the recorded information of the track, there is no need for a strict tracking servo as in the past.

However, since this method does not employ a tracking servo, even if one optical big-a-pull device is fed at a predetermined speed, deformation of the original disk D, chucking error of the original disk D, etc. may cause the pinpoint The detector (P,'', p, 1PH*P4) does not always detect information 7 on the same track.

That is, as shown enlarged in FIG. 3, each track T
Ie Tg * Tg + Recorded information of T4 (indicates block) A11Bl, CI......*
A! +82 +C3・・・・・・・・・A3.
The locus (C,, C,, C,,...) of the pinpoint detector (pH, P2+ P8. P, ) for the eyes is the track fluctuate beyond.

However, if we consider trajectory C, for example, recorded information A2 * J? After detection, the next recorded information C7 will be missing, but since this recorded information is caught by the trajectory C1 of the adjacent pinpoint detector (Pl), it will be lost from each of the pinpoint detectors (P, ~P4). Sequential recording information (Ai, Bi, Ci...
...), the missing information can always be obtained from other pinpoint detectors.

Recorded information of the 1 block (A11.B1.C1.
Since a code number indicating the recording position ff1 (or time) is added to the signal (1), the plurality of signals obtained from the photoelectric conversion element 6 can also be detected by the photoelectric conversion element 6 as described later. The code numbers can be organized and stored in a predetermined location such as a memory.

Therefore, the data caret V written in this memory
If the recorded information (Ai) lined up on the track of the optical disc D is read out sequentially using the optical disk D signal.

Bi, C4...) can be output in evening order.

Since the optical playback device of the present invention reads stored information from the optical disc D based on the principle described above, at least the spot for irradiating the optical disc DV must move at a speed corresponding to the linear velocity of the track. This eliminates the loss of recorded information and eliminates the need for a tracking servo.

Furthermore, since it is sufficient for at least one block of digital information recorded on the optical disc DK to be detected by the same pinpoint detector while the optical disc D is rotating, the track spacing can be adjusted in the same way as in the case of an optical playback device using a conventional tracking servo. It can be made relatively narrow and the recording density can be improved.

FIG. 4 is a block diagram showing an example of the reproducing circuit of the present invention, in which the recorded information butter 7 reflected from the optical disk D is a CCD 10 well known as a photoelectric conversion element.
(11, cargo coupling device). CCD1G
is used as a solid-state image sensor in a video camera, etc., and the clock signal ψ1. The pattern of recorded information imaged by supplying ψ is converted into an electric signal (2
It is possible to output

In this case, it is only necessary to sequentially convert multiple pieces of digital information that change in the running direction of the truck into electrical signals, and as mentioned above, although the same recorded information may be output in multiple electrical signals, optical The size of the pixel of C0D10 is preferably set to about 172 or less of the imaged track information so that the recorded information within the spot will not be lost.

A plurality of track information detected from C0DIO is amplified by a multi-e channel 7 amplifier 11 and converted into a digital signal by a multi-channel demodulator 12.

Reference numeral 13 indicates an error correction circuit, which corrects any errors in the demodulated digital signal.

Or destroy it. (Since a lot of the same information has been detected, 1
For example, a digital signal whose code number is unknown may be discarded).

14 is 1 block (or 17 soms) from the digital signal
A digital analyzer that separates the code number 2-2 that is added to the information of the minute is shown, and the code number 7 that corresponds to the code number is shown.
The memory 15a generates a address signal to specify the address of the memories 15a and 15b, and also stores digital information of the code number.

15b and record it.

The memories 15a, 15b are controlled by a 7dress signal generator 16 so that one of them is being written while the other is being read.

The digital information being read out alternately from the memories 15m and 15b is sent to the signal processing circuit 17. The data are reproduced in the recording order of the optical disc D by the D/A converter 18 or the like.

〔Effect of the invention〕

As described above, this invention detects digital information recorded on an optical disk as pattern information by the optical system of the pickup, and detects a plurality of track information from the pattern information imaged on the light 'Mf (converting element). , input this multiple track information 7 times into memory sequentially,
The recorded digital signals are sequentially read out from the memory and reproduced.

Therefore, since the original spot incident on the optical disk does not need to be tracked only on one recording track, a tracking servo is not required, and solid recording without dirt bands is also possible, so the recording density of the optical disk can be increased. It has the advantage of being able to Further, there is an effect that the pickup device is simplified.

[Brief explanation of drawings]

FIG. 1 shows the main device parts of this invention [1! Figure 2 shows the recording Noreen's il! imaged on the photoelectric conversion element!
2 and 3 are diagrams showing the relationship between the locus of the pinpoint detector and recorded information, and FIG. 4 is a block diagram showing an embodiment of the main reproducing circuit of the present invention. In the figure, 10 is a CCD, 11 is a multi-ψ channel 7 amplifier, 12 is a multi-red channel demodulator, and 13 is an error controller/
14 is a digital analyzer, 1sa, tsb
16 indicates a 7-don signal generator. Figure 1 Figure 2 Figure 3 Procedural amendment (voluntary) July 19, 1980 Mr. Commissioner of the Patent Office 1, Indication of the case 1lIIJ14 1982-033:18
No. 3, No. 2, Title of the invention: Optical disc playback method 3, Relationship with the case of the person making the amendment Patent applicant address: 6-7-35, Kitashinyo, Tokyo Parts Co., Ltd. Name (2)
18) Sony Corporation Representative Norio Ohga 4, Agent Kobayashi Patent Office 6F Okunomatsu Building, 31-16 Sakurago-cho, Shibuya-ku, Tokyo 150 Tel: 03 (496) 1256-5, Amendment Claims column 9 of the subject specification Detailed description of the invention column 1
Brief Description of Drawings and Drawing 6 Contents of Amendment (]) The claims of the specification are amended as shown in the attached sheet. (2) Specification page 3, line 15, member 6, line 2o to page 7, line 1
``Code number J'' in the third line and the seventh line are both corrected to ``block 7 donsu''. (3) Similarly, correct the "address signal" on page 7, line 6 with the 7 dos V signal J in memory. (4) Similarly, "linear velocity" on page 7, line 12 is corrected to "radial velocity." (5) Similarly, [13] from line 4 on page 9 to line 2 on page 10 is an error collector. ” should be corrected as follows. [13 indicates an error protection and control circuit, and if there is an error in the demodulated digital signal, it is corrected or discarded. (Since a large number of identical pieces of information are detected, for example, digital signal blocks whose Glock 7 model is unknown may be discarded.) 14 is one block (or one) block from the digital signal)
Separate the block 1 dos that is added to the information of the minute,
A write address generator is shown which generates a write address signal corresponding to block 7.
The multi-channel demodulator 12
The demodulated digital information is recorded in the memory 15. The digital information written in the memory 15 is corrected by the error correction circuit 19 using the parity contained therein. If correction is not possible, use methods such as interpolation. A read address for error correction and a write address for corrected or interpolated digital information are outputted by the error correction address generator 20. The memory 15 is controlled by the 7-domain signal selector 11C so that the read 7-domain signal generator 11 does not write during reading and does not perform error correction during writing. Digital information read from memory 15 is D/A
The converter 18 reproduces the data in the same order as the input order of the encoder when recording the optical disc D. ” (6) Similarly, delete “no guard band” in the first ofls line. (7) Similarly, on page 8 to line 10, the section "indicates error collector time v8, . . ." is corrected as follows. [Error detection and control circuit, 14 is a write address generator, 15 is a memory, 16 is a 7-domain signal selector, and 17 is a read address generator. (8) Figure 4 is amended as shown in attached sheet 5. Above 2, Claims: An optical pickup device for reproducing an original disk on which information is recorded in the form of a digital signal includes an incoherent light source, irradiating the light source onto the optical disk, and recording the optical disk from the reflected light. The pattern is formed by an optical system that forms an image on the light receiving surface of the photoelectric conversion element, and a plurality of recording information signals detected from the photoelectric conversion element are transferred to a predetermined position in the memory by a block 7 added to the digital signal. A method for reproducing an optical disc, characterized in that information recorded on the optical disc is recorded and sequentially read out from the memory.

Claims (1)

[Claims] An optical pickup device for reproducing an original disc on which information is recorded as a digital signal is equipped with a non-incoherent light source, which irradiates the twister, and uses the reflected light to read the optical disc. Recording pattern Vat
comprising an optical system that forms an image on a light-receiving surface of the conversion element; and recording a plurality of recorded information signals detected from the photoelectric conversion element in a negative position at a predetermined position in the memory according to a code number added to the digital signal; A method for reproducing an optical disc, characterized in that information recorded on the optical disc is sequentially read from the memory.