JPH04129061A - Optical disk device - Google Patents

Abstract

PURPOSE:To obtain an optical disk device coping with both of the CAV recording system and the CLV recording system by providing first and second motors and transmitting the rotation torque of the second motor to the outer peripheral side part of an optical disk medium. CONSTITUTION:A rotating device 20 provided with a second DC servo motor 8 presses a pulley 7 to the outer peripheral side part of a second optical disk medium 24 set to the main body part of an optical disk device 30 by a loading/ unloading mechanism 25 to rotate and drive the second optical disk medium 24 at a certain circumferential speed. Since the rotating device 20 is provided with a first brushless DC motor 3 and is provided in the main body part of the optical disk device 30 which rotates and drives a second optical disk medium 1 at a certain angular speed, optical disk mediums 1 and 24 are rotated and driven at the certain circumferential speed (CLV) and the certain angular speed (CAV) by one optical disk device 30. Thus, this device copes with both of CAV and CLV recording systems.

Description

[Detailed Description of the Invention] [Summary] Regarding an optical disk device that is compatible with CD-ROM (compact disk-read only memory) media, or write-once or magneto-optical recording media, it is compatible with both CAV and CLV recording systems. The purpose of the present invention is to provide an optical disc device that can rotate a first optical disc medium at a constant angular velocity.
In an optical disc device having an optical disc device main body including a first electric motor that rotates at a constant angular velocity,
a pulley that can be brought into pressure contact with the outer peripheral side of the second optical disk medium to be rotated at a constant angular velocity; a second electric motor that rotationally drives the boot; and a control section for controlling the second 'M, wJ machine and the attachment/detachment mechanism, and when the second optical disk medium is loaded, the The present invention is characterized in that the main body of the optical disc apparatus is provided with a rotating device, the pulley of which presses against the outer peripheral side of the second optical disc medium and causes the second optical disc medium to rotate at a constant linear velocity.

(Industrial Application Field) The present invention relates to an optical disk device, and more particularly to an optical disk device compatible with a CD-ROM (compact disk-read only memory) medium, or a write-once type or magneto-optical recording medium.

Generally, there are two recording methods for optical discs %I. One is CL V (Constant Linear Ve
location (constant linear velocity) recording method, which is the same as CD
-The feature is that a medium such as ROM (hereinafter referred to as CLV medium) is rotated at a constant circumferential speed. That is, in order to keep the moving speed of the medium on the optical head constant, the rotation speed of the medium is changed between when the processing position is on the inner track of the medium and when it is on the outer track of the medium. The maximum rotational speed is 900 rpm.

The other is CAV (Constant Angu1), which is represented by write-once optical disks and magneto-optical disks.
arvetoc:ty=constant angular velocity) recording method.

This is a method in which recording and reproduction are performed by rotating the disk medium (hereinafter referred to as CAV medium) at a constant angular velocity, that is, at a constant rotational speed, regardless of the processing position on the medium, and this pigeonhole rotational speed is about 240 rpm.

Both methods are being independently developed in terms of both hardware and software.

(Prior Art) A conventional optical disc device is a dedicated device for one of the two recording methods described above. For example, the CAV medium is processed by an optical disc device dedicated to the CLV recording method, On the other hand, it has not been possible to process the CLV medium with an optical disk device dedicated to the CAV recording method.

In this way, conventional optical disc devices have no compatibility with the media they are loaded with.

(Problem to be Solved by the Invention) However, when using both of the two types of optical disk media classified by the above-mentioned recording methods, it is necessary to prepare two different optical disk devices, and the purchase cost, installation location, etc. From the outside, there were many problems.

Therefore, in order to solve this problem, it is being considered to develop an optical disc device that can support the above two recording methods in one unit. However, f,=2 as mentioned
The rotational speed of the optical disk medium differs by about three times between the two recording methods, and the method of controlling the rotational speed also differs, so if the motor specifications are selected under one condition, the motor may be overloaded or drive efficiency may be affected under the other conditions. This results in problems such as a decrease in torque or torque fluctuation. In this way, the development of electric motors failed because both conditions were not met, and the development of optical disc devices that could support the above two recording methods was delayed.

SUMMARY OF THE INVENTION Therefore, the present invention has been made in view of the above-mentioned problems.It is an object of the present invention to provide an optical disc apparatus C1 which is compatible with both CAV and CLV recording systems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides the following features: a first optical disc medium to be rotated at a constant angular velocity;
An optical disc device having an optical disc device main body comprising a first electric motor that rotates at a constant angular velocity, comprising: a pulley that can be pressed against an outer peripheral side of a second optical disc medium that is to be rotated at a constant peripheral velocity; a second electric motor that rotationally drives the boot; a detachable mechanism that allows the boot to be attached to and detached from the outer peripheral side of the second optical disk medium; and a control unit that controls the second electric motor and the detachable mechanism. and when the second optical disc medium is loaded, the pulley comes into pressure contact with the outer peripheral side of the second optical disc medium to maintain a constant linear velocity with respect to the second optical disc medium. The present invention is characterized in that a rotating device for rotating the optical disc device is provided in the main body of the optical disc device.

Furthermore, from the viewpoint of manufacturing costs, it is preferable that the specification is such that a dedicated device for the CAV recording system can be easily converted into a dual-purpose device for the CAV/CLV recording system, and that the rotating device is removably attached to the main body of the optical disc device. The present invention is characterized in that it further includes attachment/detachment means.

[Effect]

A rotating device equipped with a second electric motor uses a detachable mechanism to press a pulley against the outer peripheral side of a second optical disk medium mounted on the optical disk device main body, and rotates the second optical disk medium at a constant circumferential speed. be able to. Therefore,
The rotation device includes a first electric motor and is provided in the optical disk device main body that rotates the first optical disk medium at a constant angular velocity. It can be rotated in two ways.

Furthermore, the rotating device attachment/detachment means allows the rotating device to be easily attached/detached integrally with the optical disk device main body, and can be easily attached/detached from the optical disk device provided with one type of rotational drive method.
It is easy to apply the present invention to an optical disk device equipped with two types of rotational drive systems.

〔Example〕

FIG. 1 shows a perspective view of an embodiment of an optical disc device according to the present invention.

As shown in the figure, ``■'' is an optical disk medium, which is supported by a spindle 2 and rotates. A brushless DC motor 3 is attached below the spindle 2 and is directly connected to the spindle rotating shaft. 4 is an optical head for recording/reproducing information, and 5 is an optical head drive mechanism for moving the optical head 4 to a predetermined trajectory position. The spindle 2 and the optical head drive mechanism 5' are installed on a fixed base 6, and the main body of the optical disc device (not shown) is further equipped with a control section (not shown) and performs CAV recording.
10 (hereinafter referred to as the main body).

Further, 17 is a reflective photoelectric switch for automatically identifying whether the optical disk medium mounted on the spindle 2 is a CAM medium or a CLV medium.

In FIG. 1, the optical disk medium 1 is a CLV medium.

Reference numeral 7 denotes a boot that comes into contact with the outer periphery of the optical disk medium 1 and transmits rotational torque, and is attached to the output shaft 9 of the DC servo motor 8. The DC servo motor 8 is attached to the tip of an arm 11, and this arm 11 is attached to a hinge 12.
It is rotatably fixed on the substrate 13 about the axis.

Further, since the tension coil spring 14 is attached to one end of the arm 11 and the other end is fixed to the substrate 13, the arm 11 is attached to the pulley 7 or the outer peripheral side Ia of the medium by the action of the tension coil spring 14. It is biased in the direction of being crimped. On the other hand, the main body part f5a of the solenoid 15 is located near the tension coil spring 14 on the base plate 13.
Similarly to the tension coil spring 14, the tip of the movable portion 15b is rotatably fixed to the arm 11.

When the solenoid 15 is energized, the movable part 15b moves in the direction of protruding from the main body part 15a, so the arm 11 is rotated against the tensile force of the tension coil spring 14 to move the pulley 7 away from the medium outer periphery 1a. act. Furthermore, if the solenoid 15 is not energized, the position of the movable part 15b is not restricted relative to the main body part 15a, so the arm 11 is moved by the tension coil spring 14.
The outer peripheral side surface 7a of the pulley 7 is rotated by the tensile force of
It is pressed onto the outer peripheral side portion 1a of the optical disc medium 1.

The arm 11, the hinge 12, the substrate 13, the tension coil spring 14, the solenoid 15 or the detachable mechanism 25 for the pulley 7, the pulley 7, the DC servo motor 8, the detachable mechanism 25, and various mechanical parts associated therewith. and the control unit 16 are combined into one CLV rotation device 20.

Further, the main body section 10 that performs CAV recording and the CLV rotating device 20 are connected by an attachment/detachment mechanism 18 to constitute an optical disk device 30 of this embodiment.

FIG. 2 shows a CLV rotating device 2 in an optical disk device 30.
FIG. 2 is a perspective view showing a state where 0 is detached from the main body portion 10. FIG.

In FIGS. 1 and 2, the attachment/detachment mechanism 18 is provided at an upper attachment/detachment member 18a which houses the control section 16 and forms a part of the CLV rotating device 2o, and at a corner of the fixing base 6 of the main body 1o. It consists of a lower attachment/detachment member 18b.

Each attachment/detachment member 18a, 18b has connectors 19a, 19b for exchanging electrical signals, and a CLV rotation device 20.
A clamp part (
(not shown).

The power necessary for the CLV rotation device 20, information necessary for constant circumferential speed control, etc. are provided through the connector 19a.

It is supplied from the main body section IO via 19b.

Therefore, operate the clamp section to connect the connector 19a.

The CLV rotating device 20 can be easily attached to and removed from the main body 10 by simply joining the parts 19b.

If the CLV rotation device 20 and the main unit 10 are made removable, it would be possible to supply only the main unit IO to users who are satisfied with a device dedicated to CAV media, and to provide users who need an optical disk device that can support two recording methods. can provide a CLV rotation device 20 as an option.

Generally, when elements such as the CLV rotation device 20 are incorporated into the main body, the device inevitably becomes large and expensive, but since the CLV rotation device 20 is detachable and provided as an option, it can be used in many ways. It is possible to provide an optical disk device with a high degree of freedom in terms of functions.

Next, the operation of the optical disc device 30 will be explained.

First of all, when no medium is mounted on the spindle 2, the solenoid 15 is energized and the arm 11 is rotated in the direction of the half-hour hand as described above. In this state, the pulley 7 is located away from the spindle 2, so that either a CAV medium or a CLV medium can be mounted on the spindle 2.

FIG. 3 is a diagram showing the relationship between the position of the pulley 7 and the medium when a CAV medium or CLV medium is loaded. In general, a CAV medium 21 has a disk body 22 housed in a case 23, as shown in FIG. 2(A), and a CLV medium is not housed in a case, as shown in FIG. 2(B).

When the CAV medium 21 is installed in a predetermined position of the optical disc device 3o, a case 23 in which the charging switch 17 is located outside the disc body 22 as shown in FIG. 3(A)
The optical disc device 30 detects the CAV medium 21
or recognize that it is attached. As a result, the solenoid 15 is energized as it is, and the pulley 7 is connected to the CAV medium 2.
1, the disk body 22 is rotated at a constant angular velocity by the brushless DC motor 3. The optical head 4 performs the necessary recording and reproducing processing using C.
This is done based on the AV recording method.

Next, as shown in FIG. 3(B), the CLV medium 24 (1
) is installed, the photoelectric switch 17 detects that the installed medium has no case, and the optical disc device 3
0 recognizes that a CLV medium is installed. In this case, the optical disk device 30 turns off the power to the brushless DC motor 3 to allow the CLV medium 24 (1) to rotate freely, and sends the necessary signals and power to the CLV rotation device 20.

The CLV rotation device 20 de-energizes the solenoid 15 in response to the above signal, moves the pulley 7 in the direction indicated by arrow A in the figure as described above, and rotates the CLV medium 24 (1).
CLV medium 24 by DC servo motor 8.
(1) is rotated at a constant angular velocity. And C.A.V.
As with the medium 21, the CLV medium 24 is detected by the optical head 4.
(1) Recording and reproducing processing using the CLV recording method is performed upward.

As described above, according to the optical disc device 30 of this embodiment, C.
The LV rotation device 20 rotates the optical disk medium 1 (CLV medium 24
) is configured to transmit the rotation from the outer peripheral side 1a of the optical disc medium, so that the main body 10 and CL that perform CAV rotation
The CLV rotation device 20 that performs V rotation can be incorporated into a second device as an independent device. Therefore, the optical disc device 30 is configured to be able to perform recording and reproducing processing on two optical disc media with different recording methods.

In addition, the photoelectric switch 17 detects the type of optical disc medium installed, and the optical disc device 30 automatically selects and performs the recording/reproducing operation according to the type of the medium. , CLV media) on the spindle 2, predetermined processing can be performed.

〔Effect of the invention〕

As described above, according to the present invention, first and second electric motors are provided for both the CAV recording method and the CLV recording method, which have different rotation control methods for optical disk media, and the rotational torque of the second electric motor is controlled. Because the transmission is transmitted to the outer circumferential side of the optical disc medium, it is not necessary to develop a new electric motor that can handle both of the above methods, and a single optical disc device can handle both of the above methods.
Processing using two recording methods becomes possible.

In addition, by providing a means for attaching and detaching the CLV rotation device,
The optical disc device itself consists of a CAV recording system dedicated device and a CA
This is a common part between the dual-purpose devices of the V/CLV recording method, and design costs and the like can be saved at the manufacturing stage of the dedicated device and the dual-purpose device, and the cost per unit can be reduced as a whole.

Therefore, by using the optical disk device of the present invention, CAV/CLV
For users who use both media, it is possible to save the installation space of the optical disc device, and also to expect a positive effect in terms of purchase costs.

[Brief explanation of drawings]

1 is a perspective view of an embodiment of the optical disc device according to the present invention; FIG. 2 is a perspective view of the optical disc device shown in FIG. 1 with the CLV rotating device removed from the main body; FIG. FIG. 2 is a diagram illustrating the operation when a CAV medium and a CLV medium are installed. In the figure, l is an optical disk medium, 2 is a spindle, 3 is a brushless DC motor, 7 is a pulley, 8 is a DC servo motor, 10 is a main body, 11 is an arm, 12 is a hinge, 14 is a tension coil spring, 15 is a solenoid, 17 is a photoelectric switch, 18 is an attachment/detachment mechanism, 19a, 19b are connectors, 20 is a CLV rotation device, 21 is a CAV medium, 24 is a CLV medium, 25 is an attachment/detachment mechanism, and 30 is an optical disk device.

Claims (1)

[Claims] 1) A first electric motor (
3), a pulley (7) that can be pressed against the outer peripheral side (1a) of the second optical disc medium (1) to be rotated at a constant circumferential speed. and a second electric motor (8) that rotationally drives the pulley (7).
, a detachable mechanism (25) that allows the pulley (7) to be detachably attached to the outer peripheral side (1a) of the second optical disc medium (1), and a detachable mechanism (25) that allows the second electric motor (8) and the detachable mechanism (25) ), and when the second optical disc medium (1) is loaded, the pulley (7) controls the second optical disc medium (1). The optical disk device main body (10) is provided with a rotating device (20) that is in pressure contact with the outer peripheral side portion (1a) and rotates the second optical disk medium (1) at a constant linear velocity. optical disk device. (2) The optical disc device according to claim 1, further comprising mounting/detaching means (18) for allowing the rotation device (20) to be mounted and removed from the optical disc device main body (10).