JPH01144228A - Information recorder - Google Patents

Abstract

PURPOSE:To prevent information already recorded on a recording medium from being destroyed at the time of emitting a laser beam in an initial operation by generating the laser beam at a position where a light emitting means corresponds to the information non-recording part of the recording medium. CONSTITUTION:The title recorder is constituted in such a way that the light emitting means 6 is moved to the position where the laser beam is projected on the information non-recording areas (b) and (c) of the recording medium by a moving means 5 at the time of emitting the laser beam in the initial operation of an information recorder if the means 6 is not conformed to the position where the laser beam is projected on the information non-recording areas (b) and (c), and after that, the laser beam is emitted. In such a way, it is possible to prevent the information recorded on the recording medium 1 from being destroyed even when a state where the abnormal emission of the laser beam is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an information recording device such as an optical disk device that records information on, for example, an optical disk.

(Prior Art) Conventionally, in information recording devices such as optical disk devices that use optical means to record information on a recording medium such as a write-once or erasable optical disk, a laser beam used as a recording means is used. Before emitting light from the (radiation source), make sure that the cover to avoid harmful effects on the human body is closed properly and no laser light leaks outside the device, and that the optical disc is installed in the specified position. It checks various conditions such as whether the optical disk is rotating or whether the optical disk is rotating, and only when all these conditions are satisfied does initial operations such as emitting laser light and pulling in the focus servo start. .

However, in such conventional optical disk devices,
When emitting laser light in the initial operation, no particular consideration is given to the position of the optical head relative to the surface position of the optical disc. In other words, on the premise that the laser light emission output always has a specified value, the laser light is emitted regardless of whether the optical head corresponds to the information recording area or the non-information recording area of the optical disc. It emits light.

However, in write-once or erasable optical disk devices, information on the optical disk is read with a relatively low light emitting output, while information is recorded on the optical disk with a relatively large light emitting output above a certain value. It looks like this. Therefore, if the light output exceeds a certain value, undefined information will be written to the optical disc even if it was not intended for recording, and as a result, the information that has already been recorded will be destroyed. .

In this way, if the optical head corresponds to the information recording area of the optical disk and the laser drive circuit malfunctions and emits abnormal light, the information recorded in that information recording area will be destroyed. The problem was that there was fear.

(Problems to be Solved by the Invention) The present invention provides that when emitting a laser beam in the initial operation as described above, if the light emitting means corresponds to the information recording area of a recording medium such as an optical disk, the information recording area is emitted there. This was done to solve the problem that there is a risk of destroying the recorded information, and the information recorded on the recording medium will not be destroyed when the laser beam is emitted in the initial operation. The purpose is to provide a recording device.

[Structure of the Invention] (Means for Solving the Problems) The information recording device of the present invention includes a light emitting means for emitting a laser beam to a recording medium having an information recording area and an information non-recording area, information recording means for recording information on the recording medium by controlling light emission of the means; moving means for moving the light emitting means in a radial direction of the recording medium; and the light emitting means moved by the moving means. a detection means for detecting that the irradiation position of the laser beam by the means corresponds to an information-free area of the recording medium; and when the detection means does not detect the correspondence, the moving means moves the light emitting means. The present invention is characterized in that it comprises a first processing means that moves, and a second processing means that causes the light emitting means to emit a laser beam when the correspondence is detected by the detection means.

(Function) In the present invention, when emitting laser light during the initial operation of an information recording device, if the light emitting means does not correspond to the position where the laser light is irradiated onto the non-information recording area of the recording medium, the light emitting means can be moved by the moving means. The information-free area is moved until it corresponds to the irradiation position, and then the laser beam is emitted. As a result, even if a situation such as abnormal emission of laser light occurs, the information recorded on the recording medium will not be destroyed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of an information recording device, such as an optical disk device, according to the present invention. In other words, an optical disc (
The recording medium 1 is formed by coating a metal film layer of tellurium, bismuth, or the like in a donut shape on the surface of a circular substrate made of, for example, glass or plastic.

The optical disc 1 has an information recording area a where information is recorded.
and an information non-recording area bSc where no information is recorded provided at the inner circumferential portion and the outer circumferential portion thereof.

The optical disc 1 is rotationally driven by a spindle motor 2.

The spindle motor 2 outputs a rotational speed signal S1 indicating its rotational speed to a phase comparator 3 forming a PLL (phase locked loop) circuit. This phase comparator 3 has
A reference signal S2 having a predetermined frequency is supplied from a frequency generating means (not shown).

The phase comparator 3 compares the phases of the rotational speed signal S1 supplied from the spindle motor 2 and the reference signal S2 supplied from the frequency generating means, and outputs the comparison result to the motor driver 4. be. In other words, when the rotation speed (frequency) of the spindle motor 2 is less than the frequency of the reference signal S2, a signal is output to further increase the rotation speed, and the rotation speed (frequency) of the spindle motor 2 reaches the frequency of the basic signal S2. If it is larger than that, a signal is output to reduce the rotation speed.

Furthermore, when the phase comparator 3 detects that the frequencies (phases) of the rotational speed signal S1 and the reference signal S2 match, it outputs a matching signal S3 indicating this to the control circuit 9. ing.

The motor driver 4 rotates the spindle motor 2 in response to a signal supplied from the phase comparator 3.

An optical head (light emitting means) 6 is disposed below the optical disc 1 . To this optical system, the ・end 6 is for recording or reproducing, for example, ``14''.
It is composed of a conductive laser oscillator 7, an objective lens (not shown), and the like. For example, information is recorded or reproduced by irradiating the surface of the optical disk 1 with a laser beam emitted by a semiconductor laser oscillator 7 as a minute spot.

The semiconductor laser oscillator 7 includes a laser drive circuit 2.
The laser beam is emitted depending on the value of 0.

The moving mechanism 5 for moving the optical head 6 is constituted by, for example, a linear motor. That is,
The linear motor is composed of a drive coil as a movable part and a permanent magnet as a fixed part. By exciting the drive coil, the movable part on which the optical head 6 is mounted moves in the radial direction of the optical disc 1 (in the direction of arrows A and B in the figure). ).

Further, the position detector (detection means) 8 is constituted by, for example, a photo ink printer, etc., and the optical head 6 is at the initial position, that is, the position where the laser beam is irradiated by the optical head 6 is located at the non-information recording area of the optical disc 1. It is located at a position that detects that it is compatible. A position detection signal S4 from the position detector 8 is output to a control circuit 9.

That is, as shown in FIG. The detector 6a is configured by a processor or the like so that a position detection signal S4 is output by blocking the photointerrupter, and controls the entire apparatus. The control circuit 9 controls the optical disc 1 by the coincidence signal S3 from the phase comparator 3.
It is determined that the is rotating at a constant rotation, and the position detector 8
Based on the position detection signal S4 from , it is determined whether the optical head 6 corresponds to the initial position.

The control circuit 9 controls the laser drive circuit 10 when the coincidence signal S3 from the phase comparator 3 and the position detection signal S4 from the position detector 8 are supplied during the initial operation upon power-on. A laser beam is emitted from a semiconductor laser oscillator 7. Further, the control circuit 9
At the time of the above initial operation, the position detection signal S from the position detector 8
4 is not supplied, the moving mechanism 5 is controlled to move the optical head 6 in the direction of arrow A in the figure until the position detection signal S4 is supplied from the position detector 8.

Next, the operation in such a configuration will be explained.

For example, if a power switch (not shown) is turned on,
First, the control circuit 9 rotates the spindle motor 2, that is, the optical disc 1, by controlling the motor driver 4.

The control circuit 9 also checks whether position detection (No. 3 S4) is supplied from the position detector 8, and checks the position detection signal S.
4 is supplied, it is determined that the initial position of the optical head 6, that is, the irradiation position of the laser beam by the optical head 6 corresponds to an information-free area of the optical disc 1.

As a result of the above check, the position detection signal S from the position detector 8 is
4 is not supplied, the control circuit 9 drives the moving mechanism 5 to move the optical head 6 in the direction of arrow A in the figure.

Then, when the position detection signal S4 is supplied from the position detector 8, the control circuit 9 stops the movement of the optical head 6 by the movement mechanism 5.

When the control circuit 9 has determined that the optical head 6 corresponds to the initial position and the coincidence signal S3 is being supplied from the phase comparator 3, the control circuit 9 uses the laser drive circuit 10 to The semiconductor laser oscillator 7 is driven to generate laser light.

As a result, the optical disc 1 is irradiated with laser light.

In this way, since the semiconductor laser oscillator 7 is driven to emit a laser beam when the optical head 6 is surely aligned with the non-information recording area of the optical disc 1, in the unlikely event that the laser drive circuit Even if the light emission output becomes excessive due to a malfunction such as 10, the information recorded in the information recording area a of the optical disc 1 can be prevented from being destroyed.

Further, the optical disc 1 has reached a predetermined number of rotations, the relative speed between the optical disc 1 and the optical head 6 is a predetermined speed, and the optical head 6 corresponds to the non-information recording area of the previous disc 1. When the two conditions of being in the state are satisfied, a laser beam is emitted.

This allows a smooth transition to the next process, that is, the focus servo pull-in operation.

In the above embodiment, the position detector 8 is provided so as to output the position detection signal S4 when the optical head 6 corresponds to an information-free area; It may be provided to output the detection signal S4.

Furthermore, although a case has been described in which the position detector is constituted by a photoink rubber, the position detector is not limited thereto, and may be constituted by a limit switch.

[Effects of the Invention] As detailed above, according to the present invention, the light emitting means emits laser light at a position corresponding to the non-information recorded portion of the recording medium, so that the laser light is emitted in the initial operation. At the same time, it is possible to provide an information recording device that does not destroy information already recorded on a recording medium.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of an optical disk device, and FIG. 2 is a diagram showing the mounting position of a position detector. DESCRIPTION OF SYMBOLS 1... Optical disk (recording medium), 2... Spindle motor, 3... Phase comparator, 4... Motor driver, 5... Moving mechanism (moving means), 6... Optical head ( Light emitting means), 6a... Detection body, 7... Semiconductor laser oscillation applicant's representative Patent attorney Takehiko Suzue

Claims (2)

[Claims] (1) A light emitting unit that emits a laser beam to a recording medium having an information recording area and an information non-recording area, and information that records information on the recording medium by controlling the light emission of this light emitting unit. a recording means; a moving means for moving the light emitting means in a radial direction of the recording medium; and a position where the laser beam irradiated by the light emitting means moved by the moving means corresponds to an information-free area of the recording medium. a first processing means for moving the light emitting means by the moving means when the correspondence is not detected by the detection means; and a first processing means for moving the light emitting means by the moving means; An information recording device comprising: second processing means for causing the light emitting means to emit a laser beam. (2) The information recording device according to claim 1, wherein the recording medium is an optical disc.