JPH11126472A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the inside of an optical disk device by providing a fan freely connectable to/disconnectable from a disk motor and eliminating the necessity of any special fan motors. SOLUTION: The fan 8 is provided in a disk motor 2 for rotary-driving an optical disk 5 so as to be freely connected/disconnected, and when a temperature inside a device exceeds a preset specified temperature the disk motor 2 is rotary-driven at a specified speed, and the fan 8 disconnected in a standby position is connected to the disk motor 2 so as to be integrally rotated. Thus, the inside of the device is always kept in a stable temperature environment, and such a situation that the temperature of main constituting part items in the device exceeds an operation guarantee temperature and the performance of the device is degraded, is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus in which a blower fan which can be freely coupled to and separated from a disk motor is provided and the inside of the apparatus is cooled without providing a special fan motor.

[0002]

2. Description of the Related Art An optical disk apparatus for reproducing an optical disk such as a compact disk (CD) or a read-only recording medium such as a CD-ROM is provided with a blower fan at a rear position inside a casing for cooling the inside of the apparatus. is there. In this type of optical disc device, a blower fan motor is started when the power of the device is turned on, and air is blown from behind the device to cool the inside of the device. In order to reduce the current consumption associated with driving the blower fan, a temperature sensing circuit and a fan control circuit are provided. For example, a configuration is adopted in which the fan motor is driven to rotate only when the inside of the device reaches a higher temperature than specified. Have been. In this case, when the internal temperature of the device falls below the specified value, the fan motor stops, and wasteful power consumption is suppressed.

[0003]

In the above-mentioned optical disk apparatus with a blower fan, a fan motor is disposed on a rear wall portion of a casing inside the apparatus, and the fan motor is provided separately from the disk motor for driving the optical disk to rotate. Therefore, a large space for arranging components is required inside the apparatus, and in particular, a depth is required, so that the entire apparatus cannot be downsized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure in which a cooling fan can be freely coupled to and separated from a disk motor without providing a special fan motor which causes an increase in the size of the apparatus. The purpose is to allow the inside to be cooled.

[0005]

In order to achieve the above object, a disk motor for rotating and driving an optical disk is provided so as to be capable of being connected to and separated from the disk motor. When the temperature inside the apparatus exceeds a predetermined temperature set in advance, the fan is rotated at a predetermined speed, and the air fan separated at a standby position is coupled to the disk motor to rotate integrally. And control means for causing the control unit to perform the control.

The control means is provided with a magnet chuck made of a permanent magnet fixed to a motor shaft of the disk motor, and is disposed at a distance from the magnet chuck so as to face the magnet chuck. A solenoid is provided which attracts the blower fan to a standby position against the magnetic force of the chuck and allows the magnet chuck to suck the blower fan when demagnetized.

[0007] Further, a blower fan is provided on the signal recording surface side of the optical disk which is driven to rotate by a disk motor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 (A) and (B)
FIG. 2 (A) is a longitudinal sectional side view showing an embodiment of an optical disk device of the present invention in a state of uncooled state and a state of cooled state, respectively.
3B is a side view and a top view of the optical disk device shown in FIG. 1, and FIG. 3 is a plan view of a ball chuck mechanism shown in FIG.

An optical disk device 1 shown in FIGS. 1 and 2 is a CD-ROM drive device built in a notebook personal computer, and includes a disk motor 2 and a motor shaft 2 thereof.
The ball chuck mechanism 3 mounted on the tray unit 4
In addition, it has a drawer type configuration that can be pulled out to the side of the personal computer body. A rotation drive mechanism including the disc motor 2 and an optical pickup drive mechanism are incorporated in the tray section 4. A panel section 6 pressed by a finger when inserting or removing the optical disc 5 is integrated with an end of the tray section 4. Have been. FIG.
5A and 5B show a state in which the optical disk 5 is chucked by the ball chuck mechanism 3, and the panel unit 6 is shown.
When the is pressed with a fingertip, the tray unit 4 projects about half way out of the main body of the personal computer, and thereafter the operator himself grasps the tray unit 4 and pulls out the entire unit. The mechanism incorporated in the tray unit 4 and the circuit inside the personal computer main body are connected by an extendable flexible cable 7 having a margin equivalent to the stroke of the tray unit 4 when the optical disk 5 is taken in and out. .

As shown in FIG. 3, the ball chuck mechanism 3 has a disk 3a fixed to the motor shaft 2a of the disk motor 2, and the outer diameter of the disk 3a is
The diameter is substantially the same as or slightly smaller than that of the central hole 5a. Balls 3b are disposed on the disk 3a at positions that divide the outer circumference into three equal parts, and compression springs 3c inserted into grooves radially formed on the disk 3a limit the movement of each ball 3b in the disk radial direction. Biased to the position. Therefore, when the ball chuck mechanism 3 chucks the optical disk 5, the center hole 5a of the optical disk 5 is addressed to the disk 3a, and the three balls 3b are pushed back in the radial direction of the disk to push the center hole 5a.
a is engaged with the outer periphery of the disk 3a.

Reference numeral 8 denotes a blower fan having a plurality of agitating blades 8b integrally formed around the boss 8a.
The rotation inside the casing 9 is agitated by the rotation power of a rotation shaft (here, the motor shaft 2a) engaged with the shaft hole 8c formed in the shaft 9a. As shown in FIGS. 2A and 2B, a truncated cone-shaped dome portion 9a protrudes from the casing 9 at the center of the upper surface of a cube sized to accommodate the optical disk 5. Ventilation slits 10 are formed in the left and right side surfaces and the peripheral surface of the dome portion 9a. In order to prevent dust from entering the apparatus, the outside air sucked into the apparatus through the ventilation slit 10 passes through a dustproof filter 10a provided inside the slit 10 and then passes through the blower fan 8. To be stirred.

At the end of the motor shaft 2a of the disk motor 2, a magnet chuck 11 for chucking the blower fan 8 by magnetic force is fixed. The magnet chuck 11 is made of a permanent magnet in which a shaft portion 11 b that engages with a shaft hole 8 c of the blower fan 8 protrudes from a central portion of a flange portion 11 a that receives the blower fan 8. The magnetic force of the magnet chuck 11 is required to be large enough not to separate the blower fan 8 during the suction rotation, but must be smaller than the magnetic force of the electromagnet 12 described later. Further, the outer diameter of the flange 11a of the magnet chuck 11 is smaller than the outer diameter of the disk 3a, and does not hinder chucking of the optical disk 5 to the ball chuck mechanism 3.

The electromagnet 12 is a means for attracting and holding the blower fan 8 at a standby position, and is disposed inside a dome portion 9a bulging out from the upper surface of the casing 9 of the optical disk device 1. The electromagnet 12 includes a stepped different diameter shaft 12 a having a small diameter portion that engages with the shaft hole 8 c of the blower fan 8,
The solenoid 12b is formed by winding an enamel wire around a large diameter portion of the shaft 12a, and functions to attract and hold the blower fan 8 at a standby position by a magnetic force generated by energizing and energizing the solenoid 12b. The excitation or demagnetization of the solenoid 12b of the electromagnet 12 is performed by a control circuit 14 described later.

Inside the casing 9, a temperature sensor 13 such as a thermistor for detecting the temperature inside the device, and an electromagnet 12 when the temperature inside the device measured by the temperature sensor 13 reaches a preset required cooling temperature. A control circuit 14 is provided which cuts off the power supply to the motor and drives the disk motor 2 at a predetermined rotation speed. This control circuit 14
Normally, a predetermined drive current is supplied to the solenoid 12b so that the blower fan 8 is attracted and held by the electromagnet 12. That is, when the internal temperature of the optical disk device 1 is lower than the required cooling temperature, a predetermined exciting current is supplied from the control circuit 14 to the electromagnet 12, whereby the blowing fan 8 is turned on as shown in FIG. Is held at the standby position against the magnetic force of the magnet chuck 11. Needless to say, the magnetic force of the electromagnet 12 in this case is large enough that the blower fan 8 does not fall off due to external impact or vibration.

On the other hand, when the internal temperature of the optical disk device 1 reaches the required cooling temperature while the optical disk 5 is being driven to rotate, the control circuit 1 which determines the necessity of cooling from the output of the temperature sensor 13.
4 operates to start the blower fan 8. That is, in this case, since the disk motor 2 is already being driven for rotation, the disk motor 2 rotating at, for example, about 8 times speed is used.
Rotation speed of the blower fan 8 and the magnet chuck 11
The rotation speed is switched so as to drive at a low speed, for example, about twice the speed, in consideration of the easiness of connection with the rotation speed. At the same time, the power supply to the solenoid 12b of the electromagnet 12 is cut off. Since the solenoid 12b is demagnetized at the same time as the power supply is cut off, the blower fan 8 that has been attracted to the solenoid 12b is attracted to the magnet chuck 11 composed of a permanent magnet located immediately below the solenoid, and falls down. The shaft hole 8c engages with 11b. as a result,
As shown in FIG. 1B, the blower fan 8 is integrally connected to the magnet chuck 11 and agitates the air in the apparatus while rotating by receiving the rotational power of the disk motor 2. Thereby, outside air is introduced through the ventilation slit 10, and the inside of the apparatus is cooled by exhausting the warmed air to the outside.

When the internal temperature of the apparatus becomes lower than the required cooling temperature, a predetermined exciting current is supplied to the electromagnet 12 from the control circuit 14. As a result, as shown in FIG. 1A, the blower fan 8 is attracted to the solenoid 12b side against the magnetic force of the magnet chuck 11, is separated from the magnet chuck 11, and is attracted to the solenoid 12b. As a result, the transmission of rotational power to the blower fan 8 via the magnet chuck 11 stops, and the rotation of the blower fan 8 also stops.

As described above, in the optical disk apparatus 1, the blower fan 8 is provided so as to be capable of being coupled to and separated from the disk motor 2 for rotating the optical disk 5, and when the internal temperature of the apparatus exceeds a predetermined temperature, the disk Since the motor 2 is driven to rotate at a predetermined speed and the blower fan 8 separated at the standby position is connected to the disk motor 2 and integrally rotated, the inside of the apparatus can always be placed in a temperature-safe environment. As a result, it is possible to prevent a situation in which the temperature of the main components in the apparatus exceeds the operation guarantee temperature and the performance is hindered. Further, unlike the related art, it is not necessary to dispose a fan motor for the blower fan 8 at the back of the inside of the apparatus, so that the inside of the apparatus can have a minimum necessary compact space configuration. Furthermore, since the blower fan 8 is not always coupled to the disk motor 2 but is coupled to the disk motor 2 only when the internal temperature of the device exceeds the required cooling temperature to cool the device, When the blower fan 8 is driven, the rotational speed of the disk motor 2 is made lower than the normal speed, so that the blower fan 8 and the disk motor 2 can be connected smoothly, and Cooling can be ensured.

A magnet chuck 11 made of a permanent magnet fixed to the motor shaft 2a of the disk motor 2;
The magnet chuck 1 is disposed so as to face the magnet chuck 11 and is separated from the magnet chuck 11 by electromagnetic force generated by energization.
1 is provided with a solenoid 12b that attracts the blower fan 8 to the standby position against the magnetic force of 1 and allows the magnet chuck 11 to attract the blower fan 8 when demagnetized. 8
And the separation of the blower fan 8 from the disk motor 2 due to the suction of the cooling fan 8 by the magnetic force of the solenoid 12b exceeding the magnetic force of the magnet chuck 11 in accordance with the relationship between the magnetic force and the electromagnetic force. It can be performed smoothly.

In the above description, the case where the disk motor 2 is rotating when the temperature in the apparatus rises to the specified temperature or more is described as an example. If the temperature inside the apparatus exceeds the specified temperature due to the sunshine near the window or the hot air outside, the disk motor 2 can be connected to the blower fan 8 at a speed before the blower fan 8 is connected to the magnet chuck 11. It is preferable that the electromagnet 12 be deactivated at the same time as the activation.

In the above-described embodiment, the blower fan 8 is disposed on the side opposite to the signal recording surface of the optical disk 5 in a state of being rotationally driven by the disk motor 2; The fan 8 may be arranged on the signal recording surface side of the optical disk 5 via an electromagnetic clutch mechanism (not shown) for performing the above operation. In that case,
Dust adhering to the signal recording surface side of the optical disk 5 is blown off with the rotation of the blower fan 8, and deterioration of signal reading accuracy due to dust adhering to the signal recording surface can be prevented.

[0021]

As described above, according to the present invention,
A blower fan is provided so as to be capable of being coupled to and separated from a disk motor that rotationally drives the optical disk. When the internal temperature of the apparatus exceeds a predetermined temperature, the disk motor is driven to rotate at a predetermined speed and is separated to a standby position. The structure is such that the blower fan is connected to the disk motor and rotated integrally, so that the inside of the device can always be placed in a safe environment, and the temperature of the main components in the device exceeds the guaranteed operating temperature. Can prevent the performance from being adversely affected, and it is not necessary to dispose the fan motor for the blower fan in the interior of the device as in the past. The space inside the unit exceeds the required cooling temperature, instead of always connecting the blower fan to the disk motor. Only when it is connected to the disk motor to cool the inside of the device, there is no extreme load on the disk motor, and when driving the blower fan, the rotation speed of the disk motor is lower than the normal speed, Excellent effects such as smooth coupling of the blower fan and the disc motor and reliable cooling of the inside of the device can be achieved.

Further, the control means is provided with a magnet chuck made of a permanent magnet fixed to the motor shaft of the disk motor, and is disposed to face the magnet chuck at a distance, and controls the magnetic force of the magnet chuck by an electromagnetic force generated by energization. A solenoid that attracts the blower fan to the stand-by position and allows the magnet chuck to attract the blower fan when demagnetized is provided, so that the magnetic force of the magnet chuck couples the blower fan with the disk motor and reduces the magnetic force of the magnet chuck. An effect such that the separation of the blower fan from the disk motor due to the suction of the cooling fan by the magnetic force of the solenoid being higher can be surely and smoothly performed according to the power relationship between the magnetic force and the electromagnetic force.

Further, since the blower fan is arranged on the signal recording surface side of the optical disk, dust adhering to the signal record surface side of the optical disk is blown off by the rotation of the blower fan, and the dust is deposited on the signal recording surface. It is possible to prevent the signal reading accuracy from being deteriorated due to the adhesion.

[Brief description of the drawings]

FIGS. 1A and 1B are longitudinal sectional side views showing an embodiment of an optical disk device of the present invention in a non-cooled state and a cooled state, respectively.

FIGS. 2A and 2B are a side view and a top view of the optical disk device shown in FIG.

FIG. 3 is a plan view of a ball chuck mechanism shown in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 optical disk device 2 disk motor 5 optical disk 8 blower fan 9 casing 10 ventilation slit 11 magnet chuck 12 electromagnet 12b solenoid 13 temperature sensor 14 control circuit

Claims (3)

[Claims] 1. A disk motor for rotating and driving an optical disk, a blower fan provided so as to be capable of being coupled to and separated from the disk motor and rotating by using the disk motor as a rotational drive source in a coupled state, and a device internal temperature set in advance. Control means for rotating the disk motor at a predetermined speed when the temperature exceeds a predetermined temperature, coupling the blower fan separated at a standby position to the disk motor, and integrally rotating the fan. Optical disk device. 2. The control means is provided with a magnet chuck made of a permanent magnet fixed to a motor shaft of the disk motor, and is arranged at a distance from the magnet chuck so as to be separated from the magnet chuck. An optical disc device comprising: a solenoid that attracts the blower fan to a standby position against a magnetic force of a chuck and allows the magnet chuck to attract the blower fan when demagnetized. 3. The optical disk device according to claim 1, wherein the blower fan is disposed on a signal recording surface side of the optical disk that is driven to rotate by the disk motor.