JPH05282672A - Optical information recording device - Google Patents

Abstract

PURPOSE:To change the recording light according to the degree of change in the reflection light by representing the degree as the change of the reflection light in the case an obstacle such as fingerprints appears on the translucent substrate of an optical disk. CONSTITUTION:The optical information is recorded by irradiating the recording layer of an optical disk 1 with the recording light from a recording light generation section 7 through the translucent substrate. In this case, the reflection light of the recording light from a recording light output section 7 is detected by a reflection light detection section 8, which is turned into a waveform signal by a signal forming section 15. One part of the waveform signal is subjected to sample and hold. The signal is compared with the reference signal, further the arithmetic processing of this comparison signal is performed to output the result to a recording light quantity control section 16 as a recording light quantity control reference signal. The quantity of the recording light to be generated from the recording light generation section 7 is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording apparatus for recording optical information on an optical disc by using a laser beam, and particularly recording an optimum amount of recording light through a transparent substrate of the optical disc. The present invention relates to an optical information recording device that irradiates a layer to record optical information.

[0002]

2. Description of the Related Art Compact discs, so-called CDs, are widely used in the field of digital audio and the like as optical discs of the type in which a reproduction signal is obtained by irradiating a laser beam through a transparent substrate. On the other hand, in recent years, similar to the compact disc, a recordable optical disc of a type in which recording is performed on a recording layer through a transparent substrate has been provided. A recording apparatus used for this kind of recording medium performs tracking control and focusing control while controlling rotation of an optical disk at a predetermined rotation, and irradiates a recording layer of the optical disk with a constant amount of recording light to perform recording. Is.

[0003]

However, in this type of optical disc, recording must be performed on the recording layer through the transparent substrate. Therefore, in the conventional optical information recording apparatus, when recording is performed, If there are fingerprints, fog, dust, or obstacles such as areas with different birefringence that are partly due to molding reasons on the transparent substrate surface of the optical disc, the recording light is kept constant when recording is performed. The recording light is absorbed and scattered by the fingerprint or the like on the adhered portion. As a result, the amount of recording light for the recording layer is weakened, and good recording cannot be performed.

As described above, in the portion where the recording cannot be performed well, even if the obstacle is removed during the reproduction, the reproduction signal of the portion becomes unclear, and when the reproduction is performed, the amplitude and level of the RF signal are changed. Many problems such as falling occur. The present invention, in a recording device for recording by transmitting through a transparent substrate, is not affected by obstacles such as fingerprints adhered to the substrate surface,
An object of the present invention is to provide an optical information recording device capable of favorably recording on an optical disc.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an optical information recording optical information by irradiating a recording layer of an optical disk with recording light through a transparent substrate. The optical information recording apparatus is provided with a recording light amount adjusting section for changing the light amount of the recording light according to the change of the light amount of the reflected light of the recording light.

More specifically, in an optical information recording device for recording optical information by irradiating the recording layer of an optical disk with recording light through a transparent substrate, a predetermined recording light is recorded on the recording layer of the optical disk. A recording light generator for irradiating,
Recording light amount adjusting means for adjusting the light amount of the recording light generated from the recording light generation unit, a reflected light detection unit for detecting reflected light of the recording light generated from the recording light output unit, and detected by the light detection unit. A signal forming unit for converting the reflected light into a waveform signal; a sample hold unit for sampling and holding a part of the waveform signal of the reflected light signalized by the signal forming unit; and a signal held by the sample hold unit. A comparison unit that compares and outputs the reference signal,
An optical information recording device, comprising: an arithmetic processing unit that arithmetically processes the signal output from the comparison unit and outputs the result as a recording light amount control reference signal to the comparison unit and the recording light output adjusting unit. Provide the device. Further, in the optical information recording device, an optical information recording device is provided, which has a recording light amount detection unit that detects the recording light amount of the recording light generation unit and outputs the detection signal to the arithmetic processing unit. provide.

[0007]

According to the present invention, when an obstacle such as a fingerprint is present on the transparent substrate of the optical disk 1, the extent of the obstacle appears as a change in the reflected light from the reflective layer. Since the recording light can be changed depending on the degree, the recording can be performed in the optimum state for the recording layer.

[0008]

EXAMPLES Examples of an optical information recording apparatus according to the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. First, FIG. 4 shows an example of an optical disc used for implementing the optical information recording apparatus of the present invention.

The optical disk shown in FIG. 4 is provided with a recording layer 42 made of, for example, an organic dye, and a recording layer 42 made of, for example, an organic dye on a transparent substrate 41 having spirally meandering pre-grooves formed at a predetermined pitch. The reflective layer 43, and
A protective layer 44 is provided to protect them.
A hole is provided at the center of the optical disc 1,
A clamping area for clamping the optical disk is provided around it.

FIGS. 1, 2 and 3 are views for explaining an example of the optical information recording apparatus of the present invention for recording on the optical disc. First, an example of the optical information recording apparatus of the present invention will be described with reference to the block diagram shown in FIG. The optical information recording apparatus of the present invention firstly has the disc mounting portion 2 for clamping the center hole and the clamping area of the optical disc 1 described above, and the optical disc 1 is driven by the motor 3 connected to the disc mounting portion 2. , It is designed to rotate around this clamp part. In FIG. 1, the dotted line shown on the optical disc 1 indicates the recording layer 42 of the optical disc 1.

An optical head 9 is arranged below the recording layer 42 of the optical disc 1 mounted in the disc mounting portion 2. The optical head 9 has a recording light generator 7 for generating recording light, and a reflected light detector 8 for detecting reflected light of the recording light by a reflected light detecting element. The layer 42 includes an objective lens 4 that receives recording light and receives reflected light, and a mirror 5 that forms an optical path with light that passes through the objective lens 4.

A focus control drive means 10 and a tracking control drive means 11 are provided outside the optical head 9, and a focus control circuit 13 and a tracking control circuit 12 are connected to each of them. A head drive unit 14 is provided in the optical head 9, and the head drive unit 14 moves the optical head 9 in the radial direction of the optical disc 1. As the optical head 9 moves in the radial direction, the irradiation portion of the recording light also moves in the radial direction.

The recording light detector 8 of the optical head 9 has
A signal forming unit 15 for converting the information sent from the reflected light detecting unit 8 into a signal is connected to the signal forming unit 15.
Is a read signal processing section 18 for sending a read information signal to the reproduction output terminal 20, a tracking control circuit 12 for sending a tracking error signal to the tracking control drive means 11,
The focus error signal is sent to the focus control drive means 10.
To the focus control circuit 13 for sending the recording light amount, and to the recording light amount adjusting unit 16 for sending the signal for adjusting the recording light amount.

The recording light quantity adjusting unit 16 samples the waveform of a part of the waveform signal of the reflected light sent from the signal forming unit 15 and holds the sample and hold unit, and is held by the sample and hold unit. It has a comparing section for comparing signals, and an arithmetic processing section for arithmetically processing the signals processed by the comparing section and sending the result to the comparing section as a recording light amount control reference signal. It is represented as in the block diagram shown. The recording light amount adjusting unit 16 shown in FIG. 2 receives a signal from the signal forming unit 15 and samples a part of the waveform of the reflected light, and a holding unit that holds the signal sampled by the sampling unit. It is composed of a comparing section for comparing the held value with a reference signal, and an arithmetic processing section for arithmetically processing the signal obtained from the comparing section and sending it to the comparing section.

On the other hand, the reflected light detection section 7 further has a recording light modulation signal forming section 19 for sending a recording light signal via the system controller 17, and the recording light modulation signal forming section 19 includes the recording light modulation signal forming section 19. Has a recording input terminal 21 to which a recording information signal is introduced. The recording light modulation signal forming unit 19
A modulated signal corresponding to the recorded information signal is formed, and this modulated signal is sent to the reflected light detection unit 7 incorporated in the optical head 9 via the system controller 17, and further intensity modulated according to the signal corresponding to the recorded information signal through the mirror 5. The recording layer of the optical disc 1 is irradiated with the emitted light to perform recording.

Further, this apparatus has a system controller 17, and this system controller 1
7 has a control terminal 22 to which a recording command signal is supplied. A signal introduced from the control terminal 22 causes the system controller 17 to generate a motor drive signal and a head drive signal according to the recording command signal, and to generate the motor drive signal and the head drive signal.
And the head drive unit 14 to operate the motor 3 and the head drive unit 14, respectively, and supply a control signal to the signal forming unit 15 to control the operation of the signal forming unit. Further, the system controller 17 has a recording light amount adjusting means in a portion that receives a signal sent from the recording light amount adjusting unit 16, and adjusts the recording light amount. Such a system controller 17 sends a recording signal to the recording light generator 7 built in the optical head in response to the recording command signal from the control terminal 22 and the light amount adjustment signal from the recording light amount adjusting unit 16 to emit the recording light. Let the situation occur.

When recording is performed using such an optical recording device, first, the optical disc 1 is mounted on the disc mounting portion 2.
And a recording command signal is supplied from the control terminal 22 to the system controller 17. System controller 17
Sends a motor drive signal to the motor 3 in response to the recording command signal, operates the motor 3 to rotate the optical disc 1 at a predetermined rotation speed, and sends a head drive signal to the head drive unit 14, thereby The head driving unit 14 moves the optical head 9 so that the incident position of the recording light is movable in the radial direction from the outer peripheral edge portion to the inner peripheral portion of the recordable area of the recording layer 42 of the optical disc 1. Further, the system controller 17 sends a recording light control signal to the recording light generator 7 built in the optical head to bring it into a state where recording light is generated. In addition, the system controller 17
Sends a control signal to the signal forming unit 15 so that the signal forming unit 15 can form a tracking error signal and a focus error signal.

At the same time, the recording information signal is sent from the recording input terminal 21 to the recording light modulation signal forming section 19, and the recording light modulation signal forming section 19 to which the recording information signal is sent goes through the system controller 17 to record light. The modulation signal is supplied to the generator 7, and the recording light is intensity-modulated according to the modulation signal. Then, recording light is emitted from the recording light generator 7. The recording light passes through the transparent substrate through the objective lens 4, enters the recording layer 42 of the rotating optical disc 1, and the transparent substrate 41 is rotated by the rotation of the disc and the movement of the optical head in the radial direction. Recording is performed along the groove formed in a spiral shape on the top.

Further, the light generated by the recording light generating section 7 is reflected from the reflection layer 43 of the optical disk, this reflected light is sent to the reflected light detecting section 8 through the objective lens 4, and the reflected light is reflected from the light detecting element. Is output to the signal forming unit 15 as a detection output signal of The signal forming unit 15 outputs a tracking error signal and a focus error signal based on the detection output signal and supplies them to the tracking control circuit 12 and the focus control circuit 13, respectively. As a result, the tracking control drive means 11 and the focus control drive means 10 are operated to perform tracking control and focus control so that the recording light is incident on the recording surface of the optical disc in an appropriately focused state.

Further, in the optical information recording apparatus of the present invention, the signal reflected from the optical disk 1 and sent to the signal forming section 15 via the reflected light detecting section 8 is sent to the recording light quantity adjusting section 16. .. As shown in FIG. 2, the signal sent to the recording light amount adjusting unit 16 is first sent to a sampling unit that samples a part of the waveform so as to be constant during recording. The part of the waveform to be sampled is, for example, a1, a2, a3 ..., B1, b2, b shown in FIG.
3 ..., c1, c2, c3 ... Further, as shown in FIG. 2, the voltage value sampled by the sampling unit is held by the holding unit, and the held value is sent to the comparing unit and sent to the comparing unit. The voltage value is used as a reference in the calculation unit, and the calculation result is output as a recording light amount control reference signal to the comparison unit and the recording light amount adjusting means incorporated in the system controller 17 for adjusting the light amount of the recording light.

The recording light output adjusting means incorporated in the system controller 17 adjusts the reference voltage of the recording light on the basis of the signal output from the arithmetic unit of the recording light amount adjusting unit 16, and adjusts the recording light amount for recording. Continue.

The recording light output in this way is
The signal is reflected again from the information recording surface of the optical disc, and the detection output signal is obtained again from the reflected light detection unit.
Among the detected reflected light waveforms as shown in (1), a part of the waveform that should be constant during recording is sent to the sampling unit, and the same processing as described above is performed.
That is, the voltage value is held in a holding unit that holds the voltage value sampled by the sampling unit, and the held value and the signal output by the previous calculation unit are compared by the comparison unit, and the comparison unit The calculation processing unit performs calculation with reference to the voltage value processed by, and outputs the calculation result to the comparison unit and the recording light amount adjusting unit that adjusts the light amount of the recording light built in the system controller 17.

The recording light amount adjusting means incorporated in the system controller 17 adjusts the reference voltage of the recording light power based on the signal output from the arithmetic unit and continues recording while adjusting the recording light amount. As described above, according to the present embodiment, when the optical disc 1 has an obstacle such as a fingerprint, the amount of reflected light of the recording light is reduced, so that the voltage value of the sampled and held signal becomes small, Since the calculation processing is performed so as to increase the recording light according to the value, the light amount of the recording light can be adjusted, and stable recording can be performed on the recording layer 42.

The calculation of the recording light amount adjusting section 16 is performed as follows, for example. That is, since the light emitted from the recording light as the recording light reciprocates between the optical disc and the recording optical pickup, the direct light of the recording light is now b, and the reduction rate of the light amount due to an obstacle such as a fingerprint is shown. Assuming A, the amount Y of recording light incident on the initial recording layer is expressed as Y = b × (1−A). Further, since the reflected light is affected by the obstacle again, the reflected light Z actually received by the detection unit 8 is expressed as Z = b × (1−A) ² . Therefore, as a signal for keeping Y constant, a signal of Y = (b × Z) ^1/2 may be sent. That is, it is understood that if the recording light direct light b is constant, the recording light output may be changed according to the reduction rate Z.

The present invention is not limited to the above embodiment,
Modifications are possible as long as the object of the present invention can be achieved. For example, the calculation may be performed while monitoring the recording light. That is, a recording light detection unit that detects the recording light and outputs it to the arithmetic processing unit of the recording light amount adjusting unit 16 is provided in the optical path of the recording light, and the arithmetic unit monitors the direct light and the reflected light of the recording light and The amount of recording light may be adjusted so as to keep Y constant depending on the data.

Further, the system controller 17 may have a function of detecting the maximum level of recording light and suppressing the amount of recording light so as not to exceed a certain level. By doing so, it is possible to prevent the recording light generator 7 from being damaged. Further, the present invention is not limited to the dye-based optical disc as described in the present embodiment, but can be applied to a magneto-optical disc and the like, and the means according to the present invention can also be applied to a recording / reproducing apparatus. Is.

[0027]

As is apparent from the above description, according to the optical information recording apparatus of the present invention, even if there is a fingerprint or other obstacle, the recording light is changed according to the degree of the obstacle. Therefore, it is possible to perform recording with an optimum recording light amount for the recording layer.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an optical recording device of an embodiment according to the invention.

FIG. 2 is a block configuration diagram showing a recording light amount adjustment unit of an optical recording apparatus of an embodiment according to the invention.

FIG. 3 is an explanatory diagram showing a waveform sampled by a recording light amount adjusting unit of the optical recording apparatus of the embodiment according to the invention.

FIG. 4 is a partial cross-sectional perspective view of an example optical disc used in the optical recording apparatus of the embodiment according to the invention.

[Explanation of symbols]

 1 Optical Disk 2 Disk Mounting Section 3 Motor 4 Objective Lens 5 Mirror 7 Recording Light Generation Section 8 Reflected Light Detection Section 9 Optical Head 10 Focus Control Drive Means 11 Tracking Control Drive Means 12 Tracking Control Circuit 13 Focus Control Circuit 14 Head Drive Section 15 signal forming unit 16 recording light amount adjusting unit 17 system controller 18 read signal processing unit 19 recording light modulation signal forming unit 20 reproduction output terminal 21 recording input terminal 22 control terminal 41 translucent substrate 42 recording layer 43 reflective layer 44 protective layer

Claims (3)

[Reference number] 0030117-01 [Claims] 1. An optical information recording apparatus for recording optical information by irradiating recording light onto a recording layer of an optical disk through a light-transmissive substrate, the optical information recording apparatus comprising: An optical information recording apparatus comprising a recording light amount adjusting section for changing the amount of recording light. 2. An optical information recording apparatus for irradiating a recording layer of an optical disk with recording light through a transparent substrate to record optical information, wherein the recording layer of the optical disk is irradiated with a predetermined recording beam. A recording light generation unit; a recording light amount adjustment unit that adjusts the amount of recording light generated from the recording light generation unit; a reflected light detection unit that detects reflected light of the recording light generated from the recording light output unit; A signal forming unit for converting the reflected light detected by the light detecting unit into a waveform signal, a sample hold unit for sampling and holding a part of the waveform signal of the reflected light signalized by the signal forming unit, and the sample hold unit The signal held by is compared with the reference signal and output, and the signal output from the comparing unit is arithmetically processed, and the result is used as the recording light amount control reference signal. The optical information recording apparatus characterized by having a calculation processing unit for outputting to the comparison unit and the recording light output adjustment means. 3. The optical information recording apparatus according to claim 2, further comprising a recording light amount detection unit that detects the recording light amount of the recording light generation unit and outputs the detection signal to the arithmetic processing unit. Optical information recording device.