JPS6083234A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce data excellently even when the sensitivity of a recording surface of a disk is different by providing a detecting means which detects the duty ratio of a rectangular wave as the output of a reproducing means and a control means which controls the intensity of the laser power of a laser driving means according to the output of the detecting means. CONSTITUTION:When the duty ratio of a signal recorded on and reproduced from a recording film of the disk attains to 50%, the voltage value of a signal F is Vc. The signal F is inputted to a mixer 20 to correct the bias value of a laser driving voltage according to the signal F. Namely, when the sensitivity of the recording film of the disk is low, the bias value is increased, and when high, the bias value is decreased to record the signal on an adjacent specific track repeatedly until the voltage value of the signal F attains to Vc. When the voltage value of the signal F coincides with Vc, optimum power is considered to be obtained on the disk loaded on the device and switches 19 and 21 are placed at sides B afterward to write and read normal data information.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF APPLICATION ON P1'-LEVEL The present invention provides an optical information recording/reproducing method for recording information on a disk and reading it 411:! (There is also a beginning.

Structure of conventional example and its problems In recent years, optical information recording 11J413・j; i, Ml"
It has a large capacity memory capable of recording and duplicating 11J1 playback, and it is occupied by the ratio of 1 stroke disk no.

According to 1.) i! ,'s light 2"J!' style love/IA record milk 1
1 pile 111-stand 2 [! This will be explained by 1.

1 is a disk C1 information track 1a is formed. 2 is a disk motor that rotates the disk 1, and is a turntable 2 is a remake lens that converts the light beam from the semiconductor laser 3 into '1Ii) light.
It is a wave plate. Reference numeral 7 denotes an objective lens that focuses the light beam from the semiconductor sheet 11-3 onto the disk 1. 8 is a condensing lens for condensing the reflected light from the disk 1; 9
is a photodetector which obtains a focus control signal and a dragging control signal, and also detects an information signal from the disc 1. 10 is a movable lens barrel to which optical members 3 to 9 are fixed, and the optical axis of the light beam is held by an elastic member 11 so as to be perpendicular to the surface of the turntable 2a of the disk motor 2. It is configured so that it can move in the direction of the surface runout of the disk 1 in the direction of the straw arrow X)' and i, and can also swing in the radial direction of the disk 1 in the direction of the straw arrow Y') with the Δ point as a fulcrum. 1 and 12 are movable lens barrels 10
This is focus driving means for moving the lens in the X direction. 13
is a tracking drive means for swinging the movable lens barrel 10 in the Y direction. The focus driving means 12 and the tracking driving means 13 are constituted by known driving means such as a λ voice coil. Reference numeral 14 denotes an optical transfer stand equipped with a movable lens barrel 10 and focus drive means 12.1 to racking drive means 13.

The disk 1 can also be moved in the radial direction (t) in the direction of the arrow 7yj by a known transfer means such as a linear motor (not shown).
1-7(i>, 1!'i
is a modulation circuit that modulates +11 inserted data, 1G is half ξ
In the main body laser drive circuit, the power of the 1'-guide single laser 3 is changed to strong 5 in response to the input/output data λ4., 17i; More ic
ノ'leare/,: (7?″/J is demodulated and track 1a
Ill read the data that is being read and written above.

The operation of the optical 11" single report recording 1.eta. production device constructed in this way will be explained below.

The light beam 11 from the half-t body laser 3 passes through the remake lens 4, becomes a parallel beam, passes through the same beam splitter 5, the λ/4 wavelength plate 6, and enters the C objective lens 7.
The light is focused on the disk 1. The reflected light from Isk 1 and others follows the same optical path as the incident optical path.
I't irradiated with <, .

-” In flQ, disk 1 has surface runout, l-rack 1a
Since the disc 1 is rotating erratically, in order to record information on the rack 1 and read information on a given track, the light beam must be moved around the disc 1.
, l'f following) A-cass control and 1' rack i a
(J8 requires racking flil control)
(oFocus control is performed by the photodetector 9)A- By applying a drive voltage based on the 1g of the focus control to the focus drive means, the movable lens barrel 10 is moved in the X direction, and the surface runout of the disk 1 is prevented. make it follow. .

This Niuni Focus Discrimination 1.1-Racking 1lil
l IRII becomes 11 (I), and the data to be written is modulated by the modulation circuit 15 using, for example, a known modulation method M
FM side 1 (variable JIL), depending on the frequency of the modulation signal, the semiconductor relay drive circuit 1G -L) °C? 1=
Recording is performed by converging light onto the disk 1 while modulating the conductor 3 to a high beam. That is, on the information 1 to rack 1a on the disk 1, for example, a recording film that changes in an anti-I3J direction depending on the intensity of the output power of the semiconductor laser 1 is deposited. Signal according to frequency is 1 to easy la
-1 is recorded as a signal with different shadings of reflectance 11
Next, a semiconductor laser with a constant low power is focused on the recorded information 1 to rack 1a, and the reflected light is detected by a photodetector, and the signal of A is demodulated 7::17 kT (1+,
Adjust to x and read the written data "I' +1 J
3. If the predetermined 1 to racks are different, such as 1°71t1 of the optical rack 11, move the optical transfer table in the j direction by means of transferring means to search and cover the racks to the predetermined 1.

However, the power strength (11") of the 1m semiconductor relay as shown in FIG.
1 (with some vl and V2 constant, Kl!J t
, /,: Since the information is recorded using a light beam, the high power of the two lasers in the middle of the recording film of the information I-hook is
! J-ru record 1d; degree! J! When this happens, IJ Hanoggi occurs for 11.1 hours depending on the density of the reflectance. Therefore,
This has the disadvantage that a 1-1 error occurs in the period of the signal from the photodetector 9, and a so-called jitter component 41 is demodulated (difficult to read data incorrectly).

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and therefore provides an optical information recording and reproducing device that can perform good recording and reproducing even if the sensitivity of the recording film of the disc to the semiconductor laser differs. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention comprises a detection means for detecting an air ratio of a square wave of a reproduction output of a reproduction means, and a detection means for detecting an air ratio of a square wave of a reproduction output of a reproduction means, and a detection means for detecting an air ratio of a square wave of a reproduction output of a reproduction means; This device is equipped with a control means to control the intensity of the laser power, and records the data signal by applying two No. 45 beams of a certain frequency to the rack and recording the recorded signal. By controlling the bias (I, etc.) of the recording laser power so that the D1-AR ratio of the waveform becomes 50%, a good recording/reproduction signal with few jitter components can be obtained. So it's a monkey thing.

Description of examples The embodiments of the invention will be described above with reference to the drawings.

FIG. 3 shows the configuration of an optical information recording/reproducing device in one embodiment. (υ, The configuration of the optical system of the present invention is the same as the conventional example shown in FIG. 1, and the explanation will be omitted. In FIG. 3, 1B is the oscillation percentage, 19 is the recording switch, and 20 is a mixer, which takes the input signal of mixer 20/\,
The output of the 7 oscillator 18 or the modulation circuit 15 is selected by the selector 19 for recording &11. 21 is a 137J controller for Jl raw power, 22 is a waveform shaping circuit, 23 is a Noritsubuno II tube circuit, and 24 is a sawtooth wave generation circuit, whose output is connected to the output of the Sunsol pulse generation circuit 25 and to the sample hold circuit 2G. The phase is compared. 27 is: ``embarek.''

This J: Sea urchin (I-1 made optical 5/IA record I
The operation of the IJ I1 installation will be explained below with reference to the waveform diagram in FIG. 4. Yes, 1~Easy 1
1J Before reading the desired data, perform the above-mentioned A-cass control and [-racking control to search for a specific track.

At this time, one recording switch and one playback switch 21 are set to A.
switch to the side. The signal from the oscillator 18 is transferred to the recording switch 1.
, the C laser drive circuit 1G is driven via the mixer 20, and corresponds to the output (period 1) of the oscillators 1 and 8, /, r
(r; is recorded on a specific track. The recorded signal track is reproduced with the reproduction power, and the optical detection unit 9J:
The filtered signal (A in FIG. 4) is shaped into a rectangular wave signal (B in FIG. 4) via the waveform shaping circuit 22.

A flip-flop [J
It is input to the tube circuit 23 and receives 1q of the signal C in FIG. Furthermore, the signal C is input to the sawtooth wave generating circuit 24, and the sawtooth wave signal D in FIG. On the other hand, the waveform-shaped signal B is also input to the 4) sample pulse circuit 25, and the falling edges of the signals F and R are obtained (1 to 1 to obtain the triggered ripple pulse E in Fig. 4. Sawtooth wave). The G signal is phase-compared with the ripple pulse at one sample hold time 1 (152G), and the signal G is phase-compared with the ripple pulse at 152
Obtain the DC bold voltage signal of F in the figure.

When the above-mentioned operation is performed on a disk whose recording film has low sensitivity, the portion that can be completely recorded as shown in FIG. 4A, that is, the pulse 11 of the signal Δ in FIG. Since the sawtooth wave is sampled at the lower side of the IAg tooth wave, lJ is the hold voltage [= voltage value V, L is the voltage v1- that is lean-pull in the true/υ of one sawtooth wave]. Compared to this, the recording surface has a high sensitivity of 1-1. When the above operation is carried out, as shown in Fig. 4, 1-1. ), 1, U (Go, I) On the contrary, the voltage value of the signal F is higher than the voltage value 71, VC. Also, as shown in Figure 4 C, the recording on the disk is Recorded and reproduced on the film (, -, jino) ゛ Utility reached 50% IJ, I51+-;
f', Ilf mouth; becomes LVG.

Input the above ib bow F to the mixer 20, (i'I'/4
According to FI, the bias of the laser driving voltage Iiii:i
1, i.e., the feel of the recording film on the disc)
(1 is (l\1 30 included [, (up the bar r ass hani, lower the bias value (J, lower the bias value, and record it again on the FA1 + tangent 1zz constant 1-la nku soil) The voltage value of signal F]] becomes 0.
When the voltage value of signal F matches <tc, the optimum power for the disk loaded between 4 and 2 is set, and the switch 19.21 is then switched to the B side to output normal data information. If you perform "loading and reading" operations.

The hopping operation, which determines the bias value of the laser drive voltage, is performed when the device is powered on and when a disk is replaced.

With this configuration, data is always recorded with the optimum laser power even if the sensitivity of the recording surface of the information track on the disc is different.

As described above, according to this embodiment, a signal of a constant frequency is recorded on a predetermined track before the data recording operation, and the laser recording power is adjusted according to the due-eye ratio of the signal that reproduces the error. Change the bias value and when it reaches 0%, maintain the recording power state and start recording C data. It is also possible to perform good recording and reproduction.

In the embodiment, the bias value is changed, but the overshoe 1 to 1: may be configured to gradually change over the rising hour of the recording power waveform.

Effects of the Invention As described above, the optical information recording and reproducing apparatus of the present invention has
Detection means for detecting the square wave duty ratio It of the reproduction output of the Tl hand, and control means for controlling the intensity of the laser power of the sheather driving means in accordance with the output of the output stage (5) above. By setting (), the sensitivity of the disk's recording surface is Tatsumi <even if it is good), and you can perform Me J playback.
'Eye, 1. (It was crowded.1

[Brief explanation of drawings]

Figure 1 shows the lr of the conventional J-hub information recording and reproducing device δ.
m2+ 174 Figure 2 is a Rayleigh drive voltage waveform diagram recorded in 11.5, and Figure 3 is a part of the present invention/11!
! An example is shown in 41-1 diagram of 1J optical information recording and reproducing device 7H.
1...disk, 3...,'14 ij, q (small-lea, 1...laser drive circuit, 18...
Oscillator, 1...Recording monthly cutter, 20...Mixer, 21..., rllr lL switch 22...Waveform shaping circuit, 24...Sawtooth wave light generation circuit , 25... Ringer pulse generation circuit, 2G... lean full hall 1
Mi Circuit Agent Moriki Re Hirodai Diagram”■And Book A Diagram S■

Claims (1)

[Scope of Claims] 1. A laser driving means for controlling the intensity of the laser power, and a recording means for recording a signal of a constant frequency on a specific one to one rack of the disk-1= by the laser driving means; Reproducing means for reproducing the recorded signal; detecting means for detecting a duty ratio of a reproduced output signal of the reproducing means; and controlling the intensity of the laser power of the laser driving means in accordance with the output of the detecting means. An optical information recording and reproducing device that has a control means. 2. The optical system according to claim 1, wherein the control means for controlling the intensity of the laser power fixes the laser power when the duty ratio of the reproduced output signal reaches 50%. Formula % Formula % 3. The first means of controlling the strength of the laser power is '
ig'lTj's first 11J' operating mouth, 'l and fisk'; special features characterized by being able to operate on cl Shiba IV7'
1. Optical information recorder according to claim 1: li 'j
'J 41 device I'? .