JP2004280934A - Optical disk unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the lighting of a laser beam source without affecting a circuit element or the like in a device when a tray or a drawer part is pulled out. <P>SOLUTION: When a drawer part 4 is not housed at a predetermined position of a cabinet 2, a low-level signal is output from a housing detection switch 14 to a CPU 10. Upon the reception of the low-level signal from the housing detection switch 14, the CPU 10 sends the low-level signal to a base of a driving transistor Q2. Upon the reception of the low-level signal, the driving transistor Q2 turns off a switching transistor Q1, and cuts off a voltage supplied from a power source 12 through a lighting output terminal 21 to a driver IC16 and a processing amplifier 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device having an optical pickup and a disk drive unit, and having a drawer unit for inserting and removing an optical disk by sliding it out of a cabinet unit, and more particularly to preventing a laser light emitting element from being turned on when the drawer unit is pulled out. It is.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. Hei 5-13597 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-74720 When a method of mounting / dismounting an optical disk in an optical disk device is classified, a slit-shaped window is provided in the optical disk device to put the optical disk in and out. A method in which only a tray for loading an optical disk from an optical disk device slides in and out, a method in which an optical pickup and a drawer unit that is a movable body equipped with a disk drive unit slide in and out from the optical disk device, and an optical disk There are four types of systems in which the mounting part is opened and closed like a lid. In recent years, the mounting of an optical disk device on a notebook personal computer has been generalized, and a system having a drawer unit equipped with an optical pickup and a disk drive unit has been widely used.
[0003]
In this optical disk device, safety standards specify that information should not be recorded on an optical disk or a laser beam for reproducing the recorded information should not be viewed directly. Therefore, as shown in Patent Document 1, the switch detects that the optical disk is securely mounted in the normal position of the optical disk device, rotates the normally mounted optical disk, and the rotation speed of the optical disk reaches a predetermined rotation speed. Or turn on the laser diode only when the rotating mechanism unit that rotates the tray or drawer and the optical disk is at a predetermined position in the optical disk device, as shown in Patent Document 2. A contact portion is provided so that the laser diode does not turn on when the optical disk is attached or detached.
[0004]
[Problems to be solved by the invention]
However, in the system that has a tray or drawer for loading an optical disk, the laser diode and its surroundings can be touched when the tray or drawer is pulled out. There is a danger that the laser diode will be turned on due to a short circuit in the switch or the contact portion or a peripheral portion thereof due to a conductive liquid or the like.
[0005]
In order to avoid this danger, it is conceivable to turn off the power of the optical disk device when pulling out the tray or drawer.However, a long restart time is required or the temperature of circuit elements in the device may be reduced. Inconveniences such as a change in the state and instability of the characteristics occur.
[0006]
The present invention solves such a problem, and when the tray or drawer is pulled out, reliably prevents the laser light source from being turned on without affecting circuit elements and the like in the device, and also prevents the laser light source from being turned on due to an accident. It is another object of the present invention to provide an optical disk device capable of saving power.
[0007]
[Means for Solving the Problems]
An optical disk device according to the present invention includes a first electric board provided in a housing, an optical pickup provided to be freely inserted into and removed from the housing, having a laser light source and a light receiving element, and a drive circuit for controlling driving of the optical pickup. And a drawer unit mounted with a second electrical board having a main control unit, a power supply processing circuit, and a drawer unit that detects whether the drawer unit is at a predetermined storage position. The power supply processing circuit includes a driving power supply circuit that outputs a voltage supplied from the power supply to the second electrical board, and a lighting power supply circuit that outputs the voltage supplied from the power supply to the optical pickup. The lighting power supply circuit has a switching circuit for interrupting the voltage output to the optical pickup, and the main control unit outputs a signal output from the storage detection switch when the drawer unit is not at a predetermined storage position. Ri, characterized by interrupting the switching circuit provided lighting power supply circuit of the power processing circuitry.
[0008]
Also, a drive control that controls the operation of the switching circuit provided in the lighting power supply circuit with a signal output from the main control unit and controls the operation of the switching circuit by inputting a signal output from the storage detection switch to the power supply processing circuit. It is desirable to have a circuit.
[0009]
Furthermore, when the power saving mode is set, the main control unit may cut off the switching circuit provided in the lighting power supply circuit of the power supply processing circuit.
[0010]
According to another aspect of the present invention, there is provided an optical disk device including a first electrical board provided in a housing, an optical pickup provided to be freely inserted into and removed from the housing and having a laser light source and a light receiving element, and controlling the driving of the optical pickup. And a drawer section on which a second electrical board having a drive circuit is mounted. The first electrical board detects whether the main control section, the power supply processing circuit, and the drawer section are at predetermined storage positions. The power supply processing circuit includes a driving power supply circuit that outputs a voltage supplied from the power supply to the second electrical board, and a lighting device that outputs the voltage supplied from the power supply to the optical pickup. A driving power supply circuit, wherein the driving power supply circuit has a switching circuit for interrupting a voltage output to the second electrical board, and a lighting power supply circuit has a switching circuit for interrupting the voltage output to the optical pickup. A main control unit configured to output a signal indicating that the drawer unit is not at a predetermined storage position from any or all of the plurality of storage detection switches; When a signal indicating that the drawer unit is not at the predetermined storage position is output from only one of the plurality of storage detection switches, the switching circuit provided in the driving power supply circuit is also disconnected.
[0011]
Further, it is desirable to have a display device for displaying an operation state of a switching circuit provided in a lighting power supply circuit of the power supply processing circuit.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a configuration diagram of the optical disk device of the present invention. The optical disc apparatus 1 moves the first electric board 3 provided in the cabinet 2, the second electric board 5 mounted on the drawer unit 4, the optical pickup 6, and the entire optical pickup 4 in the radial direction of the optical disc. It has a pickup drive motor 7, a disk drive motor 8 for rotating an optical disk, and a flexible printed circuit board (FPC) 9 for connecting the first electrical board 3 and the second electrical board 5.
[0013]
The first electrical board 3 includes a CPU 10 for performing sequence control, an RF signal processing circuit 11 for processing input / output signals to / from an optical disk, a power supply processing circuit 13 for switching and step-up / step-down control of an external power supply 12, It has a storage detection switch 14 for detecting whether the drawer unit 4 is at a predetermined storage position. The CPU 10 and the RF signal processing circuit 11 are composed of a plurality of ICs, and also detect a signal called a wobble signal indicating position information of a track on an optical disk. Further, the storage detection switch 14 is provided other than the first electrical component board 3 depending on the positional relationship with the drawer unit 4.
[0014]
The optical pickup 6 has a laser diode (LD) 15, a driver IC 16 for controlling light emission of the laser diode 15, various photodiodes (PD) 17 for detecting a reproduction signal of the optical disk, and a voltage output from the photodiode 17. A processing amplifier 18 for converting the data into an optical signal and various actuators 19 for controlling the position of these elements with respect to the optical disk are provided as a unit. The actuator 19 includes a focus actuator that changes the distance of the optical disk to the disk surface and a tracking actuator that moves a signal on the disk surface in the track direction. In addition, a tilt actuator that changes the inclination with respect to the disk surface is mounted as needed. The second electric board 5 is provided with an actuator 19, a drive circuit 20 for driving the pickup drive motor 7 and the disk drive motor 8. The optical pickup 6 does not need to be all integrated as a unit, and may be partially mounted on the second electrical board 5. The second electric board 5 and the optical pickup 6 mounted on the drawer unit 4 are connected to the first electric board 3 by the FPC 9.
[0015]
In the optical disk device 1, the drawer unit 4 is slid out of the cabinet 2 when the optical disk is attached and detached, and is pulled out of the cabinet 2 and is attached and detached. And stored in a predetermined position. The storage detection switch 14 determines whether the drawer unit 4 is stored at a predetermined position in the cabinet 2. The storage detection switch 14 is usually composed of two sets for safety, thereby avoiding a failure of the storage detection switch 14 and an accident when the storage detection switch 14 is intentionally operated.
[0016]
The configuration of the storage detection switch 14, CPU 10, and power supply processing circuit 13 is shown in the circuit diagram of FIG. As shown in FIG. 2, the power supply processing circuit 13 that processes and outputs the voltage from the power supply 12 of the power supply processing circuit 13 includes a driver IC 16 that controls light emission of the laser diode 15 and a lighting that supplies a voltage to the processing amplifier 18. And a drive output terminal 22 for supplying a voltage to the second electrical board 5. A switching element such as an emitter and a collector of a switching transistor Q1 is connected between the power supply 12 and the LD output terminal 21, and a base of the switching transistor Q1 is connected to a driving element such as a collector of the driving transistor Q2 via a resistor R1. The emitter of the driving transistor Q2 is grounded, and the base receives a signal from the CPU 10. An output terminal 22 directly connected to the power supply 12 is connected to a storage detection switch 14 that sends a signal to the CPU 10 indicating whether or not the drawer unit 4 is stored at a predetermined position in the cabinet 2. When the drawer unit 4 is stored at a predetermined position in the cabinet 2, the storage detection switch 14 is connected when the common terminal C is connected to the terminal A and the drawer unit 4 is not stored at a predetermined position in the cabinet 2. , The common terminal C is connected to the terminal B.
[0017]
When the drawer unit 4 is stored at a predetermined position in the cabinet 2, the common terminal C of the storage detection switch 14 conducts with the output terminal 22 and outputs a high-level signal to the CPU 10. When a high-level signal is input from the storage detection switch 14, the CPU 10 sends a high-level signal to the base of the driving transistor Q2. When a high-level signal is input from the CPU 10, the driving transistor Q2 drives the switching transistor Q1 to turn on. When the switching transistor Q2 is turned on, a predetermined voltage is sent from the power supply 12 to the lighting output terminal 21 via the switching transistor Q2, and is output to the driver IC 16 and the processing amplifier 18.
[0018]
When the drawer unit 4 is not stored at a predetermined position in the cabinet 2, the common terminal C of the storage detection switch 14 is connected to the ground, and outputs a low-level signal to the CPU 10. When a low-level signal is input from the storage detection switch 14, the CPU 10 sends a low-level signal to the base of the driving transistor Q2. When a low level signal is input from the CPU 10 to the driving transistor Q2, the switching transistor Q1 is turned off. When the switching transistor Q1 is turned off, the voltage supplied from the power supply 12 to the driver IC 16 and the processing amplifier 18 via the lighting output terminal 21 is cut off.
[0019]
When the drawer unit 4 is not stored in a predetermined position of the cabinet 2 as described above, only the voltage supplied to the driver IC 16 and the processing amplifier 18 is cut off by the power supply processing circuit 13 provided on the first electric board 3. The lighting of the laser diode 15 can be reliably prevented without affecting other circuit elements in the apparatus.
[0020]
Further, since the power supply processing circuit 13 for shutting off the lighting of the laser diode 15 is provided on the first electric board 3, even if the drawer unit 4 is pulled out from the cabinet 2, the drawer unit 4 is not exposed to the outside and touched by the operator. It is possible to prevent the occurrence of a short-circuit accident due to contamination or foreign matter.
[0021]
In the above description, the case where the signal from the storage detection switch 14 is sent to the CPU 10 and the voltage for turning on the laser diode 15 is controlled by the power supply processing circuit 13 based on the signal from the CPU 10 is described. The case where the voltage for turning on the laser diode 15 is controlled by both the signals directly output from the storage detection switch 14 will be described with reference to the circuit diagram of FIG.
[0022]
The power supply processing circuit 13 shown in FIG. 3 includes, in addition to the switching transistor Q1 and the driving transistor Q2, a driving element driven by a signal from the storage detection switch 14, for example, a driving transistor Q3, and a driving transistor Q3. And a switching element for driving the driving transistor Q2, for example, a switching transistor Q4.
[0023]
In this case, when the drawer unit 4 is stored at a predetermined position in the cabinet 2, the common terminal C of the storage detection switch 14 conducts with the output terminal 22, and outputs a high-level signal to the CPU 10 and the driving transistor Q3. . When a high-level signal is input from the storage detection switch 14, the CPU 10 sends a high-level signal to the base of the driving transistor Q2. The driving transistor Q3 is turned off when receiving a high-level signal, turns off the switching transistor Q4, and sends only the high-level signal from the CPU 10 to the driving transistor Q2. When a high-level signal is input from the CPU 10, the driving transistor Q2 turns on the switching transistor Q1, sends a predetermined voltage from the power supply 12 to the lighting output terminal 21 via the switching transistor Q2, and sends the predetermined voltage to the driver IC 16 and the processing amplifier 18. Output.
[0024]
When the drawer unit 4 is not stored at a predetermined position in the cabinet 2, the common terminal C of the storage detection switch 14 is connected to the ground, and outputs a low-level signal to the CPU 10 and the driving transistor Q3. When a low-level signal is input from the storage detection switch 14, the CPU 10 sends a low-level signal to the base of the driving transistor Q2. On the other hand, the driving transistor Q3 is turned on when a low-level signal is input. When the driving transistor Q3 turns on, the switching transistor Q4 turns on and sends a low level signal to the base of the driving transistor Q2. When a low-level signal is input from the CPU 10, the driving transistor Q2 turns off the switching transistor Q1 and cuts off the voltage supplied from the power supply 12 to the driver IC 16 and the processing amplifier 18 via the lighting output terminal 21.
[0025]
By controlling the voltage for turning on the laser diode 15 with both the signal from the CPU 10 and the signal directly output from the storage detection switch 14 without going through the CPU 10, the drawer unit 4 is stored in a predetermined position of the cabinet 2 in this manner. If not, even if the CPU 10 cannot be controlled, the lighting of the laser diode 15 can be reliably prevented.
[0026]
As shown in the circuit diagram of FIG. 4, when the power saving switch 23 operating in the power saving mode is connected in series with the storage detection switch 14, and when the drawer unit 4 is stored in a predetermined position of the cabinet 2, When the power saving mode is set and the power saving switch 23 is connected to the ground, the switching transistor Q1 is turned off, and the voltage supplied from the power supply 12 to the driver IC 16 and the processing amplifier 18 via the lighting output terminal 21 is reduced. It is good to cut it off.
[0027]
Further, as shown in the circuit diagram of FIG. 5, two sets of storage detection switches 14a and 14b may be provided in parallel. In this case, when both the storage detection switches 14a and 14b detect that the drawer unit 4 is stored in a predetermined position of the cabinet 2, the CPU 10 turns on the switching transistor Q1 and the power supply 12 outputs the lighting output terminal. When a voltage is supplied to the driver IC 16 and the processing amplifier 18 via the switch 21 and one or both of the storage detection switches 14a and 14b detect that the drawer unit 4 is not stored at a predetermined position of the cabinet 2, The CPU 10 turns off the switching transistor Q1 and cuts off the voltage supplied from the power supply 12 to the driver IC 16 and the processing amplifier 18 via the lighting output terminal 21. One of the storage detection switches 14a and 14b detects that the drawer unit 4 is stored at a predetermined position of the cabinet 2, and when the other is not detected, it is determined that the drawer unit 4 is abnormal. The switch 24 provided in the circuit is turned off, and the voltage supplied to the second electrical board 5 is cut off. In this way, it is possible to prevent an unexpected accident from occurring in advance. In addition, by displaying the operation state of the storage detection switches 14a and 14b, that is, the operation state of the switching transistor Q1, on the display device 25 such as an LED, the operator can be notified of the operation state of the optical disk device 1.
[0028]
In the above description, the optical disk device 1 having the drawer unit 4 has been described, but the present invention can be similarly applied to an optical disk device having a tray.
[0029]
【The invention's effect】
As described above, according to the present invention, when the drawer unit is not housed in a predetermined position of the housing, only the voltage supplied to the optical pickup is cut off by the power supply processing circuit provided on the first electrical board. Therefore, it is possible to reliably prevent the laser light source provided in the optical pickup from being turned on without affecting other circuit elements and the like in the apparatus.
[0030]
In addition, since the power supply processing circuit for turning off the laser light source is provided on the first electric board, the drawer portion is not exposed to the outside even if pulled out of the housing, and is touched by an operator or contaminated by foreign matter. This can prevent a short circuit accident from occurring.
[0031]
Furthermore, the signal output from the main control unit controls the operation of the switching circuit provided in the lighting power supply circuit, and the signal output from the storage detection switch is input to control the operation of the switching circuit. Even if an abnormality occurs, it is possible to reliably prevent the laser light source provided in the optical pickup from being turned on when the drawer unit is not stored in a predetermined position of the housing.
[0032]
Further, when the power saving mode is set, the power saving effect can be enhanced by driving the switching circuit provided in the lighting power supply circuit of the power supply processing circuit to cut off the voltage supplied to the optical pickup. .
[0033]
Also, when a plurality of storage detection switches are provided and only one of the plurality of storage detection switches outputs a signal indicating that the drawer unit is not at the predetermined storage position, the switching circuit provided in the drive power supply circuit is also shut off. Thereby, it is possible to prevent an unexpected accident from occurring in advance.
[0034]
Further, by displaying the operation state of the switching circuit provided in the lighting power supply circuit of the power supply processing circuit, the operator can be notified of the operation state of the optical disk device.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an optical disk device of the present invention.
FIG. 2 is a circuit diagram showing a configuration of a power supply processing circuit.
FIG. 3 is a circuit diagram showing a second configuration of the power supply processing circuit.
FIG. 4 is a circuit diagram showing a third configuration of the power supply processing circuit.
FIG. 5 is a circuit diagram showing a fourth configuration of the power supply processing circuit.
[Explanation of symbols]
1; optical disk device, 2; cabinet, 3; first electrical board,
4; drawer portion; 5; second electrical board; 6; optical pickup;
7; pickup drive motor; 8; disk drive motor; 9; FPC;
10; CPU, 11; RF signal processing circuit, 12; power supply,
13: power supply processing circuit, 14: storage detection switch,
15; laser diode, 16; driver IC, 17; photodiode,
18; processing amplifier; 19; actuator; 20; drive circuit.

Claims (5)

A second electrical board provided in the housing, an optical pickup provided to be able to be taken in and out of the housing and having a laser light source and a light receiving element, and a driving circuit for controlling driving of the optical pickup; And a drawer section on which an electrical board is mounted,
The first electrical board has a main control unit, a power processing circuit, and a storage detection switch for detecting whether the drawer unit is at a predetermined storage position, and the power processing circuit is supplied with power from a power supply. And a lighting power supply circuit for outputting a voltage supplied from a power supply to the optical pickup, wherein the lighting power supply circuit includes the optical pickup. A switching circuit that interrupts the voltage output to the
The main control unit shuts off a switching circuit provided in a lighting power supply circuit of the power supply processing circuit by a signal output from the storage detection switch when the drawer unit is not at a predetermined storage position. Optical disk device. The power supply processing circuit controls the operation of the switching circuit provided in the lighting power supply circuit with a signal output from the main control unit, and controls the operation of the switching circuit by inputting a signal output from the storage detection switch. The optical disk device according to claim 1, further comprising a drive control circuit that performs the operation. The optical disk device according to claim 1, wherein the main control unit shuts off a switching circuit provided in a lighting power supply circuit of the power supply processing circuit when a power saving mode is set. A second electrical board provided in the housing, an optical pickup provided to be able to be taken in and out of the housing and having a laser light source and a light receiving element, and a driving circuit for controlling driving of the optical pickup; And a drawer section on which an electrical board is mounted,
The first electrical board has a main control unit, a power supply processing circuit, and a plurality of storage detection switches for detecting whether the drawer unit is at a predetermined storage position. A driving power supply circuit for outputting a supplied voltage to the second electrical board; and a lighting power supply circuit for outputting a voltage supplied from a power supply to the optical pickup. A switching circuit for interrupting a voltage output to the second electrical board, the lighting power supply circuit including a switching circuit for interrupting a voltage output to the optical pickup;
When the main control unit outputs a signal indicating that the drawer unit is not in a predetermined storage position from any or all of the plurality of storage detection switches, a switching unit provided in a lighting power supply circuit of the power supply processing circuit. When a signal indicating that the drawer unit is not in a predetermined storage position is output only from one of the plurality of storage detection switches, a switching circuit provided in the driving power supply circuit is also disconnected. Characteristic optical disk device. 5. The optical disk device according to claim 1, further comprising a display device for displaying an operation state of a switching circuit provided in a lighting power supply circuit of the power supply processing circuit.

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