JPS6278727A - Optical information recording device - Google Patents

Abstract

PURPOSE:To record information with different widths between a guide groove part and an information signal groove part, by supplying the gate signal given from a gate signal generating circuit also to a power control circuit to modulate the intensity of the light beam sent from the 1st optical modulator. CONSTITUTION:A gate signal generating circuit 25 receives an address signal and delivers the gate signals. These gate signals are applied to a drive circuit 26 and a laser power control circuit 8. Then the intensity of a light beam A2 is modulated. An optical modulator 9 received an address signal modulates the intensity of an incident light beam A3. Thus a light beam A5 underwent the modulation of intensity is made incident on a shutter 27 via lenses 10 and 11. The gate output of the circuit 25 is applied to the circuit 26 and drives the shutter 27. The light beam passed through the shutter 27 is irradiated on a disk 1 via mirrors 12 and 13 and an objective lens 14. Here the spot size of a beam A5 is varied on the disk 1 according to a full-open or half-open state of the shutter 27.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc-shaped record carrier (hereinafter referred to as "disc").
This invention relates to an optical information recording device for recording information by optical means on a disk, and is used for manufacturing preformatting disks such as data file disks.

2. Description of the Related Art A conventional optical information recording apparatus for optically writing guide grooves and address information for a preformatting disk onto a disk-shaped record carrier will be described with reference to FIGS. 8 to 11. In FIG. 8, the disk 1 is, for example, a glass disk.

A resist 2 is applied onto the disk 1, and the disk 1 is rotated at a constant rotation speed (for example, 900r, p.

Rotate with m, ). Recording laser device 4 (for example, A
The light beam A1 emitted from the laser (r+laser) is incident on the optical modulator 5. The light beam A2 that has passed through the optical modulator 5 is
The beam splitter 6 splits the light beam into light beams A3 and A4. The light beam A4 is incident on the optical detector 7, and the output of the optical detector 7 is transmitted to the laser power control circuit 8.
The light beam A2 is applied to the optical modulator 5 via the optical modulator 5, forming a loop that controls the optical beam A2 to a constant value. The light beam A3 is incident on the optical modulator 9. FIG. 9 (a) as an example of an information signal
) to which the optical modulator 9 is applied the address signal shown in FIG.
As shown in Figure (b), the intensity-modulated light beam A5 enters the objective lens 14 through the lens 10.degree. 11 and the mirror 12.13. Then, the objective lens 14 focuses the light onto one point on the disk 1. However, even if the objective lens 14 focuses the light on one point on the disk 1, the distance between the objective lens 14 and the disk 1 changes due to the inclination, warpage, and unevenness of the disk 1, and the focal point is positioned on the disk surface. do not. For this reason, an automatic focus control device is required. Laser device 15 (for example H
The light beam B1 emitted from the e-Ne laser passes through the lens 16, the polarizing beam splitter 17, and the λ/4 plate 1-plate 8 beam 13, and enters the objective lens 14. At this time, the light beam B1 emitted from the laser device 15 does not expose the resist 2 to light. The mirror 13 also supports the light beam A5.
It has the property of transmitting the light beam B1, but reflecting the light beam B1. The light beam B2 reflected on the disk 1 enters the two-split detector 19 through the objective lens 14, the mirror 13, and the 8-beam splitter 17 on one λ/4 plate. The movement of the light beam B2 incident on the two-split optical detector 19 changes as shown in FIG. 10 as the disk surface moves up and down. The output of the two-split optical detector 19 is applied to a differential amplifier 20 and then to a linear motor 22 through a control circuit 21. At this time, the linear motor 22 vibrates the objective lens 14 up and down, and as a result,
The focus will be on the disk surface.

Problems to be Solved by the Invention However, in conventional optical information recording devices, the shape of the grooves, especially the width of the grooves, on the recorded disk is limited.

Since recording is performed using the same light beam A5, the address signal groove 23 and the guide groove 24 are the same, as shown in FIG.
It was not possible to maintain appropriate groove widths individually.

The present invention solves the above-mentioned conventional problems, and aims to provide an optical information recording device that can perform recording so that the guide groove portion and the information signal groove portion have different groove widths. .

Means for Solving the Problems In order to solve the above problems, the optical information recording device of the present invention includes a light source, a first optical modulator that controls the intensity of the light beam emitted from the light source, a power control circuit that controls the first optical modulator; a second optical modulator that receives an information signal such as an address signal and modulates the intensity of the optical beam from the first optical modulator; an optical system that makes the light beam from the optical modulator 2 enter an objective lens; a rotation control device that rotationally drives the disc-shaped record carrier; and a rotation control device that drives and controls the objective lens so that the light beam is always directed onto the disc-shaped record carrier an automatic focus control device that performs focused irradiation; a gate signal generation circuit that receives the information signal and generates a gate signal for distinguishing between a period of the information signal and other periods; and this gate signal generation circuit. a light shielding means for blocking a part of the light beam in the optical system under the control of a gate signal from the first light generating circuit, and supplying the gate signal from the gate signal generation circuit to the power control circuit as well. The structure is such that the intensity of the light beam from the optical modulator is modulated.

According to the above structure, it is possible to change the shape of the light beam that is focused and irradiated onto the disc-shaped record carrier by the light shielding means, and therefore, a single recording beam can detect the guide groove and the information signal groove with different groove widths. It becomes possible to keep records.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 7.

FIG. 1 is a block diagram of an optical information recording apparatus according to a first embodiment of the present invention, and the same components as those shown in FIG. 8 are given the same reference numerals and their explanations will be omitted. In FIG. 1, 25 is a gate signal generation circuit, 26 is a drive circuit, and 27 is a shutter.

The gate signal generation circuit 25 composed of a Ridrigger mono-multivibrator outputs the gate signal shown in FIG. 2(b) when an address signal as an example of the information signal shown in FIG. 2(a) is added. , this gate signal is applied to the drive circuit 26 and the laser power control circuit 8, and the light beam A2 is intensity-modulated as shown in FIG. 2(c). The light beam A3 is incident on the optical modulator 9, and the optical modulator 9 to which the address signal is applied modulates the intensity of the light beam as shown in FIG. 2(d). The intensity-modulated light beam A5 enters the shutter 27 through the lens 10°11. The gate output of the gate signal generation circuit 25 is applied to the drive circuit 26.

The shutter 27 is driven. The shutter 27 is fully open when the gate signal is generated, but when the gate signal is off,
As shown in FIG. 3, a portion of the light beam A5 is blocked.

The light beam passing through the shutter 27 is directed to the mirror 12.1.
3 and the objective lens 14 before being irradiated onto the disk 1. The spot size of the light beam A5 on the disk 1 is as follows when the shutter 27 is fully open as shown in FIG. 4(A).
It differs from the half-open case shown in FIG. 4(B).

In this way, the beam diameter and shape of the light beam on the disc 1 are different between the address (a9 groove part and the guide groove part), and it is possible to perform recording on a disc that has a guide groove part and an address signal groove part with different groove widths. I can do it.

FIG. 5 is a block diagram of an optical information recording device according to a second embodiment of the present invention, and 28 is a delay circuit.

The address signal shown in FIG. 6(a) is applied to the delay circuit 28, and then applied to the optical modulator 9 via the delay circuit 28.

The light beam A5 is then intensity-modulated as shown in FIG. 6(e). 6(b) shows the output of the gate signal generation circuit 25, FIG. 6(c) shows the output of the optical modulator 5, and FIG. 6(d) shows the output of the delay circuit 28.

According to this embodiment, the address signal of the output of the delay circuit 28 can be temporally located within the output of the gate signal generation circuit 25, so that the address signal groove part 29 and the guide groove part 30 can be completely separated. It can be recorded separately.

According to each of the above embodiments, as shown in FIG. 7, by the operation of the shutter 27, the address signal groove 29 and the guide groove 30, which have different groove widths, can be realized with a single recording beam. Recording can be performed on discs with groove width.

Effects of the Invention As described above, according to the present invention, information signal grooves and guide grooves having different groove widths can be recorded with a single recording beam, and recording can be performed on a disk having an optimum groove width.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an optical information recording device according to a first embodiment of the present invention, FIG. 2 is a diagram of signal waveforms at various parts in the same optical information recording device, and FIG. 3 is a diagram of the state of the light beam on the shutter. 4 is an explanatory diagram of the spot shape of a light beam on a disk, FIG. S is a configuration diagram of an optical information recording device according to a second embodiment of the present invention, and FIG. FIG. 7 is an explanatory diagram of the groove shape on the disk obtained by the optical information recording device of the present invention. FIG. 8 is a diagram of the configuration of a conventional optical information recording device. FIG. Figure 10 is an explanatory diagram of the light beam on the optical detector in the same optical information recording apparatus, and Figure 11 is a groove on the disk obtained by the same optical information recording apparatus. It is an explanatory diagram of a shape. DESCRIPTION OF SYMBOLS 1... Disk, 2... Resist, 3... Motor, 4... Recording laser device, 5, 9... Optical modulator,
6...Beam splitter-17...Optical detector-
, 8... Laser power control circuit, l(1, If, +
6... Lens, 12° 13... Mirror, 14...
Objective lens, 15... Laser device, 17... Polarizing beam splitter 118... λ/4 plate, 19... 2-split optical detector, 20... Differential amplifier, 21... Control circuit, 22... Linear motor, 25... Gate signal generation circuit, 26... Drive circuit, 27... Shutter, 28... Delay circuit representative Yoshihiro Morimoto Figure 2 Figure 2 Figure 1 Figure 1 σ Figure 1/Figure

Claims (1)

[Claims] 1. A light source, a first optical modulator that controls the intensity of the light beam emitted from the light source, a power control circuit that controls the first optical modulator, an address signal, etc. a second optical modulator that receives the information signal and modulates the intensity of the light beam from the first optical modulator; and an optical system that makes the light beam from the second optical modulator enter an objective lens. , a rotation control device that rotationally drives the disk-shaped record carrier; an automatic focus control device that drives and controls the objective lens to constantly focus and irradiate a light beam onto the disk-shaped record carrier; and the information signal is inputted. A gate signal generation circuit generates a gate signal for distinguishing the period of the information signal from other periods, and a part of the light beam in the optical system is controlled by the gate signal from the gate signal generation circuit. an optical information recording device comprising a light shielding means for shielding light, and configured to supply a gate signal from the gate signal generation circuit to the power control circuit as well to modulate the intensity of the light beam from the first optical modulator. . 2. The optical information recording device according to claim 1, wherein the second optical modulator is configured to receive an information signal delayed by a delay circuit.