JP2907179B2 - Optical information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical information recording / reproducing apparatus such as an optical disk apparatus, and more particularly to a cooling method for the apparatus.

[0002]

2. Description of the Related Art Conventionally, this type of optical disk apparatus has been cooled by rotating a fan for cooling the apparatus by a separate motor, or, for example, in Japanese Patent Laid-Open No. 5-2988.
As disclosed in Japanese Patent Publication No. 13, a spiral groove is provided on a rotating shaft of a spindle motor for rotating a disk to create an air flow along the spiral groove, and the device is cooled by an air flow without using a fan. As disclosed in Japanese Unexamined Utility Model Publication No. Hei 5-55396 or Japanese Unexamined Patent Publication No. Hei 5-258550, a turntable or a rotating body having a cooling fan is always driven to rotate by a spindle motor and cooled by the generated air flow. Was being performed.

[0003]

In the conventional cooling method of the optical disk apparatus described above, since a separate motor for driving the fan alone is provided, the cost is increased and the power consumption is increased. Those provided with grooves have the disadvantage that the strength of the rotating shaft is reduced or the cooling effect is insufficient, and a cooling fan is provided on the turntable or rotating body, while the turntable is rotating. If the fan rotates constantly to generate airflow,
There is a disadvantage that recording and reproduction with respect to the medium cannot be performed due to generation of vibration in the rotating portion.

Further, in the above-mentioned optical disk device,
Even when the overheating prevention process is not necessary, the fan always rotates to generate an air flow, so that there is a disadvantage that wasteful power is consumed correspondingly.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the power consumption required for cooling an optical disk apparatus, to provide a small-sized cooling system which does not adversely affect the recording / reproducing function of the disk due to vibration, and has a high cooling effect when the apparatus is overheated. An optical information recording / reproducing apparatus provided with:

[0006]

SUMMARY OF THE INVENTION An optical information recording / reproducing apparatus according to the present invention comprises a rotary drive for rotating a disk, and a rotary shaft of the rotary drive which are fitted to each other so that the shaft is independent of the rotation of the shaft. A rotating blade that is rotatable and movable on the top and has magnetism, a rotating blade rotating member fixed to a shaft of a rotary driving device and configured to rotate the rotating blade when the rotating blade abuts, The rotor is fixedly opposed to the rotating blade rotating member, and the rotating blade stationary member which stops the rotating blade when the rotating blade comes into contact, and is fixed upward to move the rotating blade on the axis by electromagnetic force. It includes an electromagnet and an overheating state detection device that detects an overheating state of the information recording / reproducing device, controls the rotation drive and recording / reproduction of the information recording / reproducing device, and controls the electromagnet when the overheating state detection device detects an overheating state. And the rotating wing stationary member The placed rotor blade, and a control device that moves until it abuts against the rotor blades rotating member.

[0007] One of the rotating blade rotating member and the rotating blade stationary member disposed opposite to each other with the rotating blade interposed therebetween is disposed above the rotating blade, and the other is disposed below the rotating blade. be able to.

When the rotating blade rotating member is provided above the rotating blade, the electromagnet is excited. When the rotating blade rotating member is provided below the rotating blade, the electromagnet is demagnetized. Each rotor is rotated by a rotor rotating member to perform a cooling action. Recording and reproduction are not performed while the rotor is rotating.

Excitation and demagnetization of the electromagnet are performed by a temperature detecting device included in the control device detecting an overheating or a temperature drop of the information recording / reproducing device.

According to the present invention, the cooling fan provided on the shaft of the spindle motor starts rotating only when overheating of the apparatus is detected. Therefore, a special independent apparatus cooling motor is required. Therefore, during a normal recording / reproducing operation in which overheating of the apparatus is not detected, rotation noise and vibration caused by the cooling fan are eliminated, and power consumption can be reduced. Also, when the overheat detection circuit operates, the operation of the optical disk reading / writing circuit is stopped, so that the supply of energy to the heat source causing overheating is interrupted during the operation of the cooling circuit. The effect can be further enhanced.

[0011]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of an embodiment of the optical information recording / reproducing apparatus according to the first, second and fourth aspects of the present invention.

In FIG. 1, the rotary drive for rotating the disk is configured to rotate the shaft 5 of the motor 1 to simultaneously rotate the chucking 6 connected to the end of the shaft 5. The chucking 6 is connected to a recording medium (not shown) to read information recorded on the recording medium or rotate the medium to record information on the medium.

The rotor 3 has blades for blowing air by rotation, and can rotate freely with respect to the shaft 5 of the motor 1. The rotor stationary member 2 serving as a lower end stopper along the shaft 5, and an upper end stopper Impeller rotary member 7
The shaft 5 is fitted so that it can move up and down freely.

The rotating blade stationary member 2 is fixed to the housing of the motor 1. When the rotating blade 3 descends and comes into contact with the upper surface, the lower surface of the rotating blade 3 and the upper surface of the rotating blade stationary member 2 are attached. The rotating wings 3 can be stopped on the upper surface of the stationary member 2 by the concave-convex fittings fitted to each other. The rotating blade rotating member 7 is fixed to the shaft 5 so as to face the stationary member 2, and when the rotating blade 3 comes into contact with the rotating member 7 at a position indicated by a broken line in the drawing, the shaft 5 And rotate with it.

When the rotor 3 rotates together with the shaft 5, an air flow is generated from the stationary member 2 in the direction of the rotating member 7, and this air flow is transmitted from the air outlet 9 through the duct 8 to a cooling port (not shown). Is sent to each part of the device that requires it.

A magnetic body 10 such as iron or nickel is provided on the upper surface of the rotary wing 3, and a solenoid 4 facing the magnetic body 10 is fixed inside the duct 8. When a current is passed through the solenoid 4, the magnetic body 10 is attracted, and the rotating blades 3 rise, contact the lower surface of the rotating rotating member 7 and rotate together. Since a gap is provided between the magnetic body 10 and the solenoid 4, they do not contact during rotation. When no current is flowing through the solenoid 4, the rotary wing 3 descends by its own weight, comes into contact with the upper surface of the stationary member 2, stops, and does not rotate. When an electric current is applied to the solenoid 4 again, the rotor 3 is lifted up above the shaft 5, comes into contact with the rotating member 7 and starts rotating, and cooling air is taken out from the blower opening 9 by the generated air flow.

FIG. 2 is a block diagram showing the configuration of the control device. Referring to FIG. 2, a power supply 2 for supplying power to the circuit
5, the electric power is supplied to the motor driving circuit 22 through the supply line 24.
Is supplied to an overheat monitoring circuit 20 including an overheat state detection sensor, and further, via a relay 21, an optical disk control circuit 23 for controlling functions as an ordinary optical disk device such as reading and writing of an optical disk, or a solenoid 4. Is supplied to any one of them. Motor drive circuit 22
Is a circuit for driving the motor 1 in FIG. The overheat monitoring circuit 20 includes, for example, a semiconductor temperature sensor, a bridge, and the like, and monitors an overheat state of the entire optical disk device. When the temperature sensor detects an overheating state, the relay 21 is operated to cut off the supply of power to the optical disk control circuit 23 and at the same time supply power to the solenoid 4.

When the apparatus performs normal functions such as reading and writing as an optical disk apparatus, power is supplied to the optical disk control circuit 23 via the relay 21. In this case, no power is supplied to the solenoid 4 and, therefore, the solenoid 4 does not act as an electromagnet, so that the magnetic body 10 of the rotor 3 is not attracted. Rotor wing 3
It is seated on the upper surface of the rotary wing stationary member 2 by its own weight, and the concave and convex fittings provided on the contact surfaces of each other are fitted and stationary.

When the temperature sensor detects an overheating state of the optical disk apparatus and the overheating monitoring circuit 20 activates the relay 21, the power supply to the optical disk control circuit 23 is cut off, and the solenoid 4 is excited to generate electromagnetic force. Acts on the magnetic body 10 of the rotor 3. The rotor 3 is a solenoid 4
Moves upward along the shaft 5 due to the attraction force and comes into contact with the rotary blade rotating member 7. Since the rotating member 7 is fixed to the shaft 5 and rotates together with the shaft 5, the rotating blade 3 starts rotating with the rotating member 7 by frictional force, sucks air from below, and passes through the duct 8 to the air outlet 9. A cooling air flow is released toward the cooling device. The air outlet 9 guides a cooling airflow to a heat-generating portion of the optical disk device to perform cooling.

When the temperature sensor of the overheat state detecting circuit 20 detects that the temperature of the optical disk apparatus has dropped from the overheated state to a predetermined temperature, the overheat monitoring circuit 20 operates the relay 21 to cut off the power supply to the solenoid 4 and Since the optical disk control circuit 23 is driven, the functions of the optical disk device, such as reading and writing, return to a normal use state.

As described above, in the optical disk apparatus according to the present invention, power is not supplied to the optical disk control circuit during the cooling by the rotating blades, so that the cooling is effectively performed quickly. In addition, during normal operation of the optical disk device, the rotation of the rotating blades for cooling is stopped, so that no vibration or noise is generated by the rotating blades, thereby improving the recording / reproducing accuracy of the optical disk device and reducing power consumption. Less.

Next, a second embodiment according to claims 1, 3 and 5 of the present invention will be described.

In FIG. 3, the rotating blade stationary member 12 is fixed to the inner surface of the duct 8, and the rotating blade 13 is moved upward by the electromagnetic force of the solenoid 4, and the stationary blade 12 is moved to the position shown by the solid line in FIG. When contacting the lower surface, the rotor 1
The upper and lower surfaces of the stationary member 12 and the lower surface of the stationary member 12 can be stationary by fitting into and out of concave and convex shapes, respectively. The rotating blade rotating member 17 is fixed to the shaft at a lower portion of the shaft 5 so as to face the stationary member 12, and the rotating blade 13 comes into contact with the rotating member 17 at a position shown by a broken line, whereby the shaft 5 And rotate with it.

The difference between the configuration of the second embodiment of the present invention shown in FIG. 3 and that shown in FIG. 2 is that the position where the rotor rotating member and the rotor stationary member are provided is The point is that it is upside down with respect to the wing.

Therefore, the operation in the second embodiment is as follows. That is, as shown in the block diagram of FIG. 4, when the temperature sensor of the overheat state detection circuit 20 detects the overheat state of the device and activates the relay 21a to shut off the circuit, the solenoid 4 is demagnetized and the rotor 13 Abuts against the rotating member 17 to rotate and cool.
Since the power supply to the optical disk control circuit 23 is cut off, the cooling is effectively performed. When the temperature sensor detects a temperature drop from an overheated state of the optical disk device, the overheat monitoring circuit 20 activates the relay 21a to supply power to the solenoid 4 and the optical disk control circuit 23. It is pulled up by the electromagnetic force of the solenoid 4, abuts against the stationary member 12 and is held stationary, and the function of the optical disk device returns to a normal state.

As described above, the same operations and effects as those of the first embodiment can be obtained in the second embodiment.

Next, a description will be given of a case where the above-described embodiment of the present invention has an external interface circuit as shown in the block diagram of FIG. In FIG. 5, the optical disk device has a disk read / write circuit 30 for controlling the reading and writing of data, an external interface circuit 31 and a controller 32 for controlling the operation of each circuit.
The output from the overheat monitoring circuit 20 is input to 2, and the excitation power to the solenoid 4 is output.

When the controller 32 receives an overheat detection signal from the overheat monitoring circuit 20, the controller 32 first stops the interface circuit 31 and connects the disk read / write circuit 30 with an externally connected device such as a computer (not shown) via the data bus 33. Data transfer is interrupted, and thereafter, the disk read / write circuit 30 is stopped, a current is supplied to the solenoid 4, and the rotating blades are activated to cool the apparatus.

[0029]

As described above, the present invention does not provide a motor dedicated to a cooling fan, but provides a cooling rotor which is driven only when the apparatus is overheated, on the axis of a spindle motor. This has the effect of reducing power consumption, reducing power consumption, and reducing noise.

Further, when the apparatus is overheated, the operation of the optical disk control circuit is stopped in conjunction with the operation of the cooling rotor, so that the apparatus can be cooled quickly.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional view showing a first embodiment of an optical disk device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a part of a control device of the optical disk device shown in FIG.

FIG. 3 is a schematic partial sectional view showing a second embodiment of the optical disk device according to the present invention.

4 is a block diagram showing a configuration of a part of a control device of the optical disk device shown in FIG.

FIG. 5 is a block diagram showing another configuration of the control device of the optical disc device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2, 12 Rotating blade stationary member 3, 13 Rotating blade 4 Solenoid 5 Shaft 6 Chucking 7, 17 Rotating blade rotating member 8 Duct 9 Blow port 10 Magnetic body 20 Overheat monitoring circuit 21, 21a Relay 22 Motor drive circuit 23 Optical disk Control circuit 24 Supply line 25 Power supply 30 Disk read / write circuit 31 Interface circuit 32 Controller 33 Data bus

Claims (5)

(57) [Claims] 1. An optical information recording / reproducing device having an overheat prevention device, comprising: a rotation drive device for rotating a disc; and a rotation shaft of the rotation drive device, wherein the rotation of the shaft is A rotor that is rotatable and movable on the shaft independently and has magnetic properties; and a rotor blade that is fixed to the shaft of the rotary drive device and provides rotation to the rotor when the rotor contacts the rotor. A member, a rotor stationary member fixed to face the rotor rotating member across the rotor, and stopping the rotor when the rotor comes into contact with the rotor blade; An electromagnet fixed above for moving on the axis, and including an overheated state detection device for detecting an overheated state of the information recording / reproducing device, controlling rotation driving and recording / reproducing of the information recording / reproducing device, and The overheat state detection device A control device that controls the electromagnet to move the rotor mounted on the rotor stationary member until the rotor contacts the rotor rotating member when the overheat state is detected. Playback device. 2. The optical information according to claim 1, wherein said rotor rotating member is disposed above said rotor, and said rotor stationary member is disposed below said rotor. Recording and playback device. 3. The optical information according to claim 1, wherein the rotating blade rotating member is disposed below the rotating blade, and the rotating blade stationary member is disposed above the rotating blade. Recording and playback device. 4. When the overheat condition detecting device detects an overheat condition of the information recording / reproducing device, the electromagnet is excited and the rotor moves, and rotates while contacting the rotor member. When the recording / reproduction of the information recording / reproducing device is stopped, and when the overheating state detecting device detects a predetermined temperature drop of the information recording / reproducing device, the electromagnet is demagnetized, and the rotor blades become the rotor blade stationary member. 3. The optical information recording / reproducing device according to claim 2, wherein the information recording / reproducing device is moved up and down and the recording / reproducing of the information recording / reproducing device is driven. 5. When the overheat condition detecting device detects an overheat condition of the information recording / reproducing device, the electromagnet is demagnetized and the rotor moves, and rotates while abutting on the rotor member. When the recording / reproduction of the information recording / reproducing device is stopped, and when the overheat state detecting device detects a predetermined temperature drop of the information recording / reproducing device, the electromagnet is excited, and the rotating wing is rotated by the rotating wing stationary member. 4. The optical information recording / reproducing apparatus according to claim 3, wherein the information recording / reproducing apparatus is moved and stopped until it comes into contact with the upper part, and recording / reproducing of the information recording / reproducing apparatus is driven.