JPH04368662A - Disk player - Google Patents

Abstract

PURPOSE:To surely prevent malfunction and simultaneously to reduce a cost by deciding to be in the state of setting a timer when a pickup is in a position except a prescribed position at the time of re-supplying power after a power cut and commanding to reopen a play. CONSTITUTION:When a timer setting command is imparted by an operating part 13, the pickup 5 is moved to an outer peripheral side from a home position and an inside switch 9 is turned off. After the power cut is performed in a state like this, when the power is re-supplied from an external timer device 14, a power supply detecting signal is generated from a power supply detecting part 11. Then, by a controller 10, the loading of a disk 1 is detected optically with a disk loading detector 16 and when the off state of the inside switch 9 is discriminated, the play is reopened by deciding to be in the state where the timer is set. Thus, when the pickup 5 is un-positioned to the position except the prescribed position, the playing state is evaded and the mulfunction is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player for playing discs such as video discs.

0002

[Background Art] Conventional disc players, except those with a built-in timer switch, have an external timer device and are set in the timer device as a timer performance function to start playing at a desired time. Some devices were equipped with a function that detected when power was supplied from a timer device at the specified time and entered a playing state. Also,
In a disk player equipped with a memory that stores the operating state immediately before the power was cut off, when the power supply voltage is supplied from the timer device, the contents of the memory are read out and the operating state immediately before the power is cut off is restored. There was also something to play.

However, in the case of a disc player that automatically operates when power supply voltage is supplied from a timer device, the power supply is temporarily cut off due to a power outage, and then the power supply is restarted. Since the disc player would go into a playing state even when the disc player was turned on, it was necessary to unplug the AC plug from the outlet when the disc player was not to be used for a long time. Further, in the case of a disk player equipped with a memory that stores the operating state immediately before the power is cut off, there is a problem in that the cost increases.

0004

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc player with a timer performance function that can reliably prevent malfunctions and reduce costs.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The disc player of the present invention is a disc player that enters a performance state in response to a performance start command, reads information recorded on the disc by moving a pickup, and positions the pickup at a predetermined position in a stopped state.
means for generating a timer setting command, means for moving the pickup to a position other than a predetermined position in response to the timer setting command, and means for detecting the power supply after the power supply is cut off and supplying the power. means for generating a detection signal; pickup position detection means for detecting that the pickup is at a position other than the predetermined position in response to the power supply detection signal; and a performance start command generation means for generating a performance start command at a certain time.

[0006]

[Operation of the invention] In the disc player of the present invention,
When the timer setting command is issued, the pickup is moved to a position other than the predetermined position, and when the pickup is located at a position other than the predetermined position, the timer setting has been performed. If power is supplied from an external timer device after the timer is set and the power supply is cut off in this way, it will be detected and a power supply detection signal will be generated, and the pickup will be activated when the power supply detection signal is generated. If it is at a position other than the predetermined position, it is assumed that the timer has been set and a performance start command is issued.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In this disc player, a disc 1 is an optical disc such as a video disc or a compact disc, and is fixed on a turntable 2 by a clamper 3. The disk 1, turntable 2, and clamper 3 are rotationally driven by a spindle motor 4, and recorded information on the disk 1 is written and read by a pickup 5. The pickup 5 is provided so as to be linearly movable in the radial direction of the disk, and is supported by a slider mechanism using a slider motor 6 as a driving source. In this slider mechanism, a worm gear 7 is fixed to a rotating shaft 6a of a slider motor 6, and a longitudinal worm 8 is meshed with the worm gear 7. The pickup 5 is provided with a nut (not shown), and the worm 8 meshes with the nut, so that the rotation of the worm 8 causes the pickup 5 to move in the radial direction of the disk. The pickup 5 includes an optical system including a laser diode and an objective lens, a photodetector that receives the light beam reflected by the disk 1, and a photodetector that receives the light beam reflected by the disk 1.
a focus actuator that controls the position of the objective lens in the optical axis direction with respect to the information recording surface of the disk; and a tracking actuator that controls the position of the main beam spot (information reading point) emitted from the pickup 5 in the disk radial direction with respect to the recording track. It has built-in actuators, etc. The read output of the pickup 5 passes through an RF amplifier (not shown), is demodulated by a demodulation circuit (not shown), and is output as a reproduction signal.

The pickup 5 has its home position at the innermost circumferential position of the disk 1, and is located at the home position when the operation mode is a stop mode. The inside switch 9 detects that the pickup 5 is at this home position. The pickup 5 is provided with a protruding piece 5a, and when located at the home position, the protruding piece 5a presses the movable element 9a of the inside switch 9, turning the inside switch 9 on. The inside switch 9 is connected to a control circuit 10 consisting of a microcomputer. The control circuit 10 includes a power supply detection section 11, a motor drive circuit 12, and an operation section 1.
3 is connected. The power supply detection section 11 generates a power supply detection signal when power is supplied to the disc player. A motor drive circuit 12 drives the slider motor 6 in accordance with a drive control signal from a control circuit 10. Operation unit 1
Reference numeral 3 is a keyboard which generates operation mode command signals such as timer settings according to operations.

Note that the above-mentioned inside switch 9 is also provided in conventional disc players. On discs such as compact discs, information is usually written from the inner circumference to the outer circumference, and the innermost area contains data indicating the track (song) number and time of information such as music recorded on the disc. (TOC on compact discs
) are recorded. Therefore, it is necessary to read it before starting a performance, so when the performance ends and the mode shifts to stop mode, the pickup is moved to the home position and the pickup is positioned at the home position in order to prepare for the next performance. This is detected by the side switch.

Next, the timer setting operation and timer playing operation in this configuration will be explained according to the operation of the control circuit 10. The control circuit 10 determines at predetermined timings whether or not a timer setting command has been issued from the operation unit 13 as shown in FIG. 2 (step S1). When the control circuit 10 receives a timer setting command from the operation unit 13, the control circuit 10 may interrupt the following steps. When a timer setting command is generated, the pickup 5 is sent to the motor drive circuit 12.
A first drive control signal is generated to move the controller to the home position (step S2). The drive circuit 12 rotates the slider motor 6 in a predetermined direction in response to the first drive control signal. As a result, the worm gear 7 and the worm 8 rotate, and the pickup 5 moves toward the innermost circumference of the disk 1. After the first drive control signal is generated, it is determined whether the inside switch 9 is turned on (step S
3). If the inside switch 9 is in the OFF state, the process returns to step S2 and a first drive control signal indicating movement to the home position is generated again. If the inside switch 9 is in the ON state as shown in FIG. 1, the pickup 5 is located at the home position, so the second drive control signal is sent to move the pickup 5 from the home position to the outer circumferential side by a predetermined distance. occurs (step S4). In response to the second drive control signal, the drive circuit 12 rotates the slider motor 6 in a direction opposite to the predetermined direction. This causes the pickup 5 to move toward the outer circumference of the disk 1. Note that the slider motor 6 is driven for a predetermined period of time to remove the pickup 5.
may be moved from the home position to the outer circumferential side. After the second drive control signal is generated, it is determined whether the inside switch 9 is turned off (step S5). If the inside switch 9 is in the on state, the process returns to step S4 and a second drive control signal indicating movement toward the outer circumference by a predetermined distance is generated again. On the other hand, if the inside switch 9 is in the OFF state because the pickup 5 has moved from the home position to the outer circumferential side, a display indicating that the timer setting has been made is displayed on the display device 15 (step S6). This means that the timer setting has ended in this disc player. After completing the timer setting, the user turns off the power switch (not shown) and sets the disc player to receive power via the external timer device 14. Note that the display device 1
5 consists of a light emitting diode, for example. Further, the main body of the disc player may be automatically turned off at the same time as the timer setting ends, without turning off the power switch.

After the timer setting is completed, the timer device 14
The power supply start time is set and time measurement is started. Then, when the timer device 14 finishes measuring the time until the power supply start time and starts supplying power to the disc player, power is supplied to the player, and power is supplied from the power supply detection unit 11. A detection signal is generated. If the power supply detection signal is supplied to the control circuit 10,
As shown in FIG. 3, the control circuit 10 immediately determines whether or not the disc 1 is mounted on the turntable 2 (
Step S11). The mounting of the disc 1 is detected, for example, optically by the disc mounting detection section 16. If the disc 1 is mounted, it is determined whether the inside switch 9 is in the off state (step S12). If the inside switch 9 is in the OFF state, this indicates that the timer has been set, and a control signal for changing the operation mode to the performance mode is generated as a performance start command (step S13). That is, if the pickup 5 is at a position other than the home position when power is supplied from the timer device 14, the timer setting has been made, and the operation mode changes to the performance mode according to the control signal. Then, the disc starts playing. On the other hand, inside switch 9
If it is on, the pickup 5 is at the home position and no timer settings have been made, so nothing is done and the timer is ignored.

The control circuit 10 can be constructed as shown in FIG. 4 instead of the microcomputer as described above. The control circuit shown in FIG. 4 includes a timer setting signal generation circuit 21, a drive control signal generation circuit 22, a switch state detection circuit 23, and a performance command circuit 24. The timer setting signal generation circuit 21 is composed of a logic circuit including a flip-flop, for example, and generates a timer setting signal in response to an operation output from the operation section 13. Drive control signal generation circuit 22
is connected to the timer setting signal generation circuit 21, and generates either a predetermined first or second drive control signal according to an input signal. The switch state detection circuit 23 is connected to the output of the inside switch 9, detects whether the inside switch 9 is on or off, and generates an on/off detection signal indicating the on/off state. This detection signal is supplied to a timer setting signal generation circuit 21, a drive control signal generation circuit 22, and a performance command circuit 24. The performance command circuit 24 generates a control signal for setting the operation mode to the performance mode when the power supply detection signal is supplied from the power supply detection section 11. Note that the drive control signal generation circuit 22, the switch state detection circuit 23, and the performance command circuit 24 are composed of, for example, logic circuits.

In this configuration, when a timer setting command is supplied from the operating section 13 to the timer setting signal generating circuit 21, the timer setting signal generating circuit 21 generates a timer setting signal. The drive control signal generation circuit 22 generates a first drive control signal in response to this timer setting signal. As a result, when the pickup 5 is located at the home position, the switch state detection circuit 23 generates an on detection signal. In response to the ON detection signal, the drive control signal generation circuit 22
Generation of the drive control signal is stopped and a second drive control signal is generated. When the pickup 5 moves from the home position, the switch state detection circuit 23 generates an off detection signal. In response to the off detection signal, the timer setting signal generating circuit 21 stops generating the timer setting signal, and the drive control signal generating circuit 22 stops generating the second drive control signal after a predetermined time. Therefore, the timer setting is completed.

After the timer setting is completed, the time device 14
When a power supply detection signal is supplied from the power supply detection section 11 because power is supplied from the power source, the performance command circuit 24 receives a disk attachment detection signal from the disk attachment detection section 16 and an off detection signal from the switch state detection circuit 23. If each is supplied, a control signal is generated to change the operating mode to a performance mode.

[0015]

As described above, in the disc player of the present invention, when a timer setting command is issued, the pickup is moved to a position other than the predetermined position, and when the pickup is located at a position other than the predetermined position, the timer setting is not performed. This means that If power is supplied from an external timer device after the timer has been set and the power supply has been cut off, it will be detected and a power supply detection signal will be generated. If it is at a position other than that position, it is assumed that the timer has been set, and a performance start command is issued. In other words, even if the power supply to the disc player is temporarily cut off due to a power outage, and the power supply is then simply supplied, unless the pickup is located at a position other than the predetermined position, the playing state will not be avoided. be done. Therefore, according to the present invention, it is possible to provide a disc player with a timer performance function that operates reliably at low cost without requiring a special memory for storing the timer setting time. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flow diagram showing the operation of a control circuit in the player of FIG. 1;

FIG. 3 is a flow diagram showing the operation of a control circuit in the player of FIG. 1;

FIG. 4 is a diagram showing another configuration of the control circuit.

[Explanation of symbols of main parts]

1 Disc 2 Turntable 3 Clamper 4 Spindle motor 5 Pick up 6 Slider motor 6 7 Worm gear 8 Warm 9 Inside switch 10 Control circuit 11 Power supply detection section 12 Motor drive circuit 13　Operation section

Claims (2)

[Claims] 1. A disc player which enters a performance state in response to a performance start command, reads information recorded on the disc by moving a pickup, and positions the pickup at a predetermined position in a stopped state, the disc player having a timer setting command. means for generating a power supply, means for moving the pickup to a position other than the predetermined position in response to the timer setting command, and means for detecting power supply after the power supply is cut off and generating a power supply detection signal. means for detecting that the pickup is located at a position other than the predetermined position in response to the power supply detection signal; and a performance start command generating means for generating the performance start command at the time of the disc player. 2. Means for detecting attachment of a disc to a turntable in a player, wherein the performance start command generating means detects when the pickup is connected to the turntable when the power supply detection signal is supplied. 2. The disc player according to claim 1, wherein the play start command is generated when the disc is located at a position other than a predetermined position and a disc is mounted.