JPH11339371A - Optical disk recording/reproducing device and image pickup device provided with optical disk recording/ reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable optical recording/reproducing device which is capable of preventing disturbance in the recording/reproducing operation even though an optical disk rotating at a high speed is used, and an image pickup device provided with the optical disk recording/reproducing device. SOLUTION: A rotating angular velocity of the optical disk 2 around the rotational axis, when the parallel direction to the rotating surface of the optical disk 2 is made to the rotational axis, is detected by an angular velocity sensor 7. Then, the amount of the detected rotating angular velocity is compared with a prescribed reference value by a comparator circuit 9, and when the rotating angular velocity is larger than this reference value, the operation to record the data or to reproduce the data in the optical disk 2 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus and an imaging apparatus having the optical disk recording / reproducing apparatus.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus using an optical disk, a high-speed rotating optical disk is irradiated with a light beam focused by an objective lens to record a signal. If the distance between the objective lens and the recording layer of the optical disc is not kept constant, the light beam may not be accurately focused on the recording layer, and the signal may not be recorded.

[0005] On the other hand, if the light beam is not properly applied to the recording layer of the optical disk, the signal cannot be reproduced correctly. For this reason, focus servo and tracking servo operations are performed so that the light beam can be accurately focused on the recording layer.

[0004]

In such a conventional recording / reproducing apparatus, for example, when provided in a portable video camera (imaging apparatus), the rotating surface of the optical disk is substantially orthogonal to the horizontal direction. It is arranged to be in the direction of However, when recording an image on an optical disc that rotates at a high speed with such a portable video camera, if the camera is rotated at a high speed, the rotational axis of the optical disc becomes a rotation plane in a direction parallel to the rotation plane of the optical disc. A force is generated around an axis that is parallel and that is orthogonal to the rotation axis, that is, a Coriolis force is generated and the optical disk is bent.

As a result, the distance between the objective lens and the recording layer of the optical disc changes, and the light beam is not accurately focused on the recording layer, and the signal cannot be recorded accurately. Also, when the video camera is turned at a high speed during image reproduction, Coriolis force is generated similarly,
There has been a problem that the light beam reflected from the recording layer of the optical disk cannot be read accurately, and the image cannot be reproduced accurately.

Accordingly, the present invention provides a portable optical disk recording / reproducing apparatus and an image pickup apparatus having the optical disk recording / reproducing apparatus which can prevent a recording / reproducing operation from being disturbed even when an optical disk which rotates at a high speed is used. It is intended to be.

[0007]

According to the first aspect of the present invention,
In order to achieve the above object, in a portable optical disk recording / reproducing apparatus, when a rotation axis is a direction parallel to a rotation surface of the optical disk, a detection means for detecting a rotation angular velocity of the optical disk around the rotation axis; The magnitude of the rotational angular velocity detected by the detecting means is compared with a predetermined reference value, and when the rotational angular velocity is greater than the reference value, an operation of recording data on the optical disc or an operation of reproducing data is performed. And control means for canceling.

In this case, if the optical disk is bent by Coriolis force when the portable recording / reproducing apparatus is rotated at high speed, the operation of recording data on the optical disk or the operation of reproducing data is stopped. Because
Recording layer on the optical disk other than the one that should be recorded (recording track adjacent to the recording track that should be recorded)
To prevent data from being recorded by irradiating the optical disk with light, and to prevent data from being reproduced incorrectly due to the inability to accurately read the light beam reflected from the optical disk. Can be.

As a result, it is possible to realize a portable optical disk recording / reproducing apparatus which can prevent a recording / reproducing operation from being disturbed even when an optical disk which rotates at a high speed is used. According to a second aspect of the present invention, in order to achieve the above object, in the first aspect of the present invention, there is provided a driving unit for driving the optical disk to rotate, and the control unit controls the rotation angular velocity detected by the detecting unit. When the value is larger than the reference value, the drive unit is controlled to reduce the rotation speed of the optical disk.

In this case, when the optical disc is bent by Coriolis force when the portable recording / reproducing apparatus is turned at a high speed, the rotation speed of the optical disc is reduced. Can be prevented from bending the optical disk. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and the data recording / reproducing operation can be performed normally.

According to a third aspect of the present invention, in order to achieve the above object, in the first or second aspect of the present invention, there is provided a display means for displaying a warning, and the control means detects the warning by the detecting means. When the rotational angular velocity is higher than the reference value, a warning is displayed by the display means. In this case, when the optical disc is bent by Coriolis force when the portable recording / reproducing apparatus is turned at a high speed, a warning is displayed, so that the user can reduce the turning force or stop the operation. Can be promoted, and bending of the optical disk can be prevented by preventing the Coriolis force from being generated during the recording / reproducing operation. As a result, the distance between the objective lens and the recording layer of the optical disc can be kept constant,
The data recording / reproducing operation can be performed normally.

According to a fourth aspect of the present invention, there is provided an image pickup apparatus having the optical disk recording / reproducing apparatus according to the first aspect of the present invention. It is possible to realize a portable imaging device capable of preventing a recording / reproducing operation from being disturbed. According to a fifth aspect of the present invention, there is provided an image pickup apparatus including the optical disk recording / reproducing apparatus according to the second aspect, wherein the objective lens and the recording layer of the optical disk are recorded or reproduced during the recording / reproducing operation. Can be kept constant, and the data recording / reproducing operation can be performed normally. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and a portable imaging device that can perform data recording / reproducing operations normally can be realized.

According to a sixth aspect of the present invention, there is provided an image pickup apparatus having the optical disk recording / reproducing apparatus according to the fifth aspect of the present invention, in order to reduce the turning force for a user. It is possible to promote an operation of stopping, and it is possible to prevent a Coriolis force from being generated during the recording / reproducing operation, thereby preventing the optical disk from being bent. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and a portable imaging device that can perform data recording / reproducing operations normally can be realized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is an explanation based on an embodiment of the present invention. 1 and 2 are diagrams showing a first embodiment of an optical disk recording / reproducing apparatus and an image pickup apparatus having the optical disk recording / reproducing apparatus according to the present invention, and correspond to the first or fourth aspect of the present invention.

First, the configuration will be described. FIG. 1 is a diagram showing an optical disk recording / reproducing device, and FIG. 2 is a diagram showing a video camera (imaging device) incorporating the recording / reproducing device. In FIG. 1, reference numeral 1 denotes a recording / reproducing apparatus. The recording / reproducing apparatus 1 includes an optical disk 2, a spindle motor 3, a motor control circuit 4, an optical pickup 5, a recording / reproduction control circuit 6, an angular velocity sensor 7, and a reference value generation circuit 8. , And a comparison circuit 9.

As shown in FIG. 2, the optical disk 2 is disposed so that its rotating surface is substantially perpendicular to the horizontal direction, and is stored in the storage cassette of the video camera 10 in this state ( In FIG. 1, the rotation surface of the optical disk 2 is in the horizontal direction, but in reality, FIG. 2 is a correct arrangement position.) The spindle motor 3 is an actuator that rotates the optical disk 2 at a high speed in the direction indicated by the reference symbol A, and the motor control circuit 4 controls the rotation speed of the spindle motor 3.

The optical pickup 5 has a laser emitting unit, an objective lens, and the like, and is moved in the radial direction of the optical disk 2 by a servo system (not shown). The optical pickup 5 has a recording / reproduction control circuit 6 during recording.
The recording layer of the optical disk 2 is irradiated with laser light based on the recording signal input from the optical disk 2, and at the time of reproduction, the recording layer of the optical disk 2 is irradiated with laser light to generate a read signal from the reflected light of the optical disk. I have.

The recording / reproduction control circuit 6 has an image sensor, a compression / expansion device, a modulation / demodulation device, a memory, etc., as is well known. Output, and an optical pickup 5 for playback.
The read signal output from the device is reproduced.
When a direction parallel to the rotation surface of the optical disk 2 is defined as a rotation axis (the rotation axis is indicated by a symbol B), the angular velocity sensor 7 determines the rotation angular velocity of the optical disk 2 around the rotation axis (the direction of detection of the rotation angular velocity is indicated by an arrow). C), and constitutes a detecting means.

The reference value generating circuit 8 has a predetermined reference value,
For example, the optical pickup 5 outputs an output value of the angular velocity sensor 7 indicating the upper limit of the rotational angular velocity range in which recording and reproduction can be performed. The comparison circuit 9 compares the signal output from the angular velocity sensor 7 with the signal output from the reference value generation circuit 8, and outputs a signal to the recording / reproduction control circuit 6 when the rotation angular velocity is larger than the reference value.

When this signal is input, the recording / reproduction control circuit 6 controls the optical pickup 5 to stop the operation of recording data on the optical disk 2 or the operation of reproducing data. In the present embodiment, the comparison circuit 9 and the recording / reproduction control circuit 6 constitute control means. Next, the operation will be described.

At the time of recording an image, a laser beam is radiated from the optical pickup 5 to the recording layer of the optical disk 2 based on the recording signal input from the recording / reproduction control circuit 6. At this time, the laser beam radiated from the laser light source is emitted. Are condensed by an objective lens, irradiated on the optical disk 2 and recorded on the recording layer. However, when the user turns the video camera 10 at a high speed, a force is generated around a rotation axis parallel to the rotation surface of the optical disc 2, that is, a Coriolis force is generated and the optical disc 2 is bent. The distance between the objective lens and the recording layer of the optical disc 2 changes.

At this time, the detection signal from the angular velocity sensor 7 is compared with the reference value output from the reference value generation circuit 8 by the comparison circuit 9, and when the rotational angular velocity is larger than the reference value, Coriolis force is generated. Then, a signal is output to the recording / reproduction control circuit 6. When this signal is input, the recording / reproduction control circuit 6 controls the optical pickup 5 and stops the operation of recording data on the optical disc 2.

On the other hand, when reproducing an image, the recording layer of the optical disk 2 is irradiated with laser light from the optical pickup 5 and the reflected light of the optical disk is reproduced by the recording / reproduction control circuit 6. At this time, if the user turns the video camera 10 at a high speed for some reason, Coriolis force is generated, bending occurs on the optical disk 2, and the distance between the objective lens and the recording layer of the optical disk changes. The reflected light cannot be read accurately.

At this time, the detection signal from the angular velocity sensor 7 is compared with the reference value output from the reference value generation circuit 8 by the comparison circuit 9, and when the rotational angular velocity is larger than the reference value, Coriolis force is generated. The recording / reproduction control circuit 6 controls the optical pickup 5 to determine
The operation of reproducing data for is stopped. For this reason,
It is possible to prevent a data layer from being recorded by irradiating a light beam on a recording layer (recording track adjacent to a recording track to be originally recorded) on the optical disc 2 other than the recording layer to be originally recorded. It is possible to prevent the data beam from being incorrectly read because the light beam reflected from above cannot be read accurately.

As a result, it is possible to realize the video camera 10 having the portable optical disk recording / reproducing apparatus 1 which can prevent the recording / reproducing operation from being disturbed even when the optical disk 2 rotating at a high speed is used. it can. FIG. 3 is a diagram showing a second embodiment of the optical disk recording / reproducing apparatus according to the present invention, and corresponds to the second or fifth aspect of the present invention.
In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, as shown in FIG. 3, the spindle motor 3 and the motor control circuit 4 have driving means for driving the optical disk 2 to rotate, and the comparison circuit 9 uses the detection signal from the angular velocity sensor 7 and the reference signal. The reference value output from the value generation circuit 8 is compared, and a signal is output to the motor control circuit 4 when the rotational angular velocity is larger than the reference value. The rotation speed of the spindle motor 3 is reduced.

In this embodiment, when the user turns the video camera 10 at a high speed during image recording, the comparison circuit 9 compares the detection signal from the angular velocity sensor 7 with the reference value output from the reference value generation circuit 8. When the rotational angular velocity is higher than the reference value, it is determined that Coriolis force has occurred, and a signal is output to the motor control circuit 4 to reduce the rotational speed of the spindle motor 3.

When the user turns the video camera 10 at a high speed for some reason during image reproduction, the comparison circuit 9 determines the detection signal from the angular velocity sensor 7 and the reference value output from the reference value generation circuit 8. In comparison, when the rotational angular velocity is higher than the reference value, it is determined that Coriolis force has occurred, and a signal is output to the motor control circuit 4 to reduce the rotational speed of the spindle motor 3.

For this reason, it is possible to prevent the bending of the optical disc 2 by reducing the Coriolis force during the recording / reproducing operation. As a result, the distance between the objective lens and the recording layer of the optical disc 2 can be kept constant,
The data recording / reproducing operation can be performed normally. FIG. 4 is a diagram showing a third embodiment of the optical disk recording / reproducing apparatus according to the present invention, and corresponds to the invention according to claim 3 or 6. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, an LED for displaying a warning is provided.
And a warning display device (display means) 11 comprising the same. The measurement display device 11 is turned on or off at an arbitrary position on the monitor of the video camera 10 based on an output signal from the comparison circuit 9. ing. The comparison circuit 9 compares the detection signal from the angular velocity sensor 7 with the reference value output from the reference value generation circuit 8, and outputs a signal to the warning display device 11 when the rotation angular velocity is larger than the reference value to light up. Or blink it.

In the present embodiment, when the user turns the video camera 10 at a high speed during image recording, the comparison circuit 9 compares the detection signal from the angular velocity sensor 7 with the reference value output from the reference value generation circuit 8. When the rotational angular velocity is higher than the reference value, it is determined that Coriolis force has occurred, and the warning display device 11 is turned on or blinks. Also, when the user turns the video camera 10 at high speed for some reason during image reproduction, the comparison circuit 9 compares the detection signal from the angular velocity sensor 7 with the reference value output from the reference value generation circuit 8, When the rotational angular velocity is higher than the reference value, it is determined that Coriolis force has occurred, and the warning display device 11 is turned on or blinks.

Therefore, during the recording / reproducing operation, the user can be urged to perform an operation of reducing or stopping the turning force, thereby preventing the Coriolis force from being generated and preventing the optical disk 2 from being bent. can do. As a result, the distance between the objective lens and the recording layer of the optical disc 2 can be kept constant, and the data recording / reproducing operation can be performed normally.

[0033]

According to the first aspect of the present invention, a recording layer (recording track adjacent to a recording track to be originally recorded) other than a recording layer to be originally recorded on an optical disk is irradiated with a light beam, so that data is recorded. It is possible to prevent the data from being recorded and preventing the light beam reflected from the optical disk from being read accurately, thereby preventing the data from being incorrectly reproduced. As a result, it is possible to realize a portable recording / reproducing apparatus which can prevent a recording / reproducing operation from being disturbed even when an optical disk which rotates at a high speed is used.

According to the second aspect of the present invention, when the optical disk is bent by Coriolis force when the portable recording / reproducing apparatus is rotated at a high speed, the rotation speed of the optical disk is reduced. Thus, the bending of the optical disk can be prevented by reducing the force of the optical disk. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and the data recording / reproducing operation can be performed normally.

According to the third aspect of the present invention, a warning is displayed when the optical disc is bent by Coriolis force when the portable recording / reproducing apparatus is turned at high speed, so that the turning force is given to the user. Can be encouraged to reduce or stop the optical disk, and the optical disk can be prevented from being bent by preventing the generation of Coriolis force. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and the data recording / reproducing operation can be performed normally.

According to the fourth aspect of the present invention, it is possible to realize a portable image pickup apparatus which can prevent a recording / reproducing operation from being disturbed even when an optical disk which rotates at a high speed is used. According to the fifth aspect of the invention, it is possible to prevent the optical disc from being bent by preventing the Coriolis force from being generated during the recording / reproducing operation. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and a portable imaging device that can perform data recording / reproducing operations normally can be realized.

According to the sixth aspect of the present invention, it is possible to prompt the user to reduce or turn the turning force, and to bend the optical disk so as not to generate the Coriolis force during the recording / reproducing operation. Can be prevented from occurring. As a result, the distance between the objective lens and the recording layer of the optical disk can be kept constant, and a portable imaging device that can perform data recording / reproducing operations normally can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is an external view of an imaging device having the optical disc recording / reproducing device of the first embodiment.

FIG. 3 is a schematic configuration diagram showing a second embodiment of the optical disc recording / reproducing apparatus according to the present invention.

FIG. 4 is a schematic configuration diagram showing a third embodiment of the optical disk recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical disk recording / reproducing device 2 optical disk 3 spindle motor (driving means) 4 motor control circuit (driving means) 5 optical pickup 6 recording / reproducing control circuit (control means) 7 angular velocity sensor (detecting means) 8 reference value generation circuit 9 comparison circuit ( Control means) 10 Video camera (Imaging device) 11 Warning display device (Display means)

Claims (6)

[Claims] 1. A portable optical disk recording / reproducing apparatus, comprising: detecting means for detecting a rotational angular velocity of an optical disk around the rotation axis when a direction parallel to a rotation surface of the optical disk is defined as a rotation axis; Comparing the magnitude of the rotational angular velocity detected by the above with a predetermined reference value, and when the rotational angular velocity is greater than the reference value, suspends the operation of recording data on the optical disc or the operation of reproducing data. An optical disc recording / reproducing apparatus, comprising: a control unit. 2. An optical disk drive comprising: a drive unit for rotating the optical disk; wherein the control unit controls the drive unit when the rotation angular velocity detected by the detection unit is greater than the reference value, and 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the rotation speed is reduced. 3. A display means for performing a warning display, wherein the control means displays a warning by the display means when the rotational angular velocity detected by the detecting means is larger than the reference value. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein: 4. An image pickup apparatus comprising the optical disk recording / reproducing apparatus according to claim 1. 5. An image pickup apparatus comprising the optical disk recording / reproducing apparatus according to claim 2. 6. An image pickup apparatus comprising the optical disk recording / reproducing apparatus according to claim 3.