JP3630843B2 - RECORDING MEDIUM REPRODUCTION DEVICE AND RECORDING MEDIUM REPRODUCTION DEVICE POWER ON / OFF STATE DISCRIMINATION METHOD - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium playback apparatus, and more particularly to a recording medium playback apparatus provided with means for determining its state and a power on / off state determination method for the recording medium playback apparatus.
[0002]
[Prior art]
As shown in FIG. 6, a conventional recording medium reproducing apparatus, for example, a CD disk reproducing apparatus, has a CD mechanism 1 including an optical pickup assembly and a pickup assembly driving motor, and a CD that supplies a control signal for controlling the motor. It consists of a control circuit 2 and a microcomputer (hereinafter referred to as a microcomputer) 3 that controls the operation of the CD control circuit 2. Generally, the power switch is not a stroke switch, and the microcomputer is normally energized when AC power is on. The power switch is cyclically turned on / off to other circuits.
[0003]
[Problems to be solved by the invention]
However, when the AC power supply is cut off due to a power failure or the like, the power-on / off state of the playback device before the power supply is cut off is not known. Therefore, conventionally, the backup circuit 4 uses an internal RAM or the like in the microcomputer 3. At the time of the method using an external RAM (a memory element that stores internal information even if it is not energized, such as E ² PROM), it is necessary to add a capacitor, a battery, etc. to keep the microcomputer 3 energized. However, there is a problem that the memory element and related circuits need to be added, which increases the cost.
[0004]
An object of the present invention is to provide a recording medium reproducing apparatus capable of solving the problems of the conventional apparatus and performing cost-effective backup.
[0005]
[Means for Solving the Problems]
A recording medium reproducing apparatus according to the present invention is a recording medium reproducing apparatus including a reproducing mechanism including a pickup assembly for reproducing a recording medium, a pickup assembly driving motor, and the like, and a control circuit for controlling the reproducing mechanism. The reproduction mechanism includes a switch for detecting whether the pickup assembly is at a predetermined position or a position other than the predetermined position, a state of the recording medium reproduction device, a power-off state, and a power-on state capable of reproducing the recording medium. And a power key switch for switching between them. Then, the control circuit controls the movement of the pickup assembly to a position where the switch detects that the pickup assembly is in a predetermined position in the power-off state, and the recording medium reproducing apparatus in the power-on state When not reproducing, the pickup assembly is controlled to move to a position where the switch detects that the pickup assembly is located at a position other than the predetermined position. If the pickup assembly is located at a position other than the predetermined position, it is determined that the power supply is cut off in the power-on state. If the pickup assembly is at the predetermined position, it is determined that the power supply is cut off in the power-off state.
Further, when the reproduction mechanism has a reproduction key switch for starting reproduction of the recording medium and the control circuit does not start reproduction of the recording medium by the reproduction key switch in the power-on state, the pickup assembly causes the pickup assembly to move to a predetermined position. The pick-up assembly may be controlled to be moved to a position where it is detected that it is other than the above.
The reproduction mechanism has a stop key switch for stopping reproduction of the recording medium, and when the control circuit stops reproduction of the recording medium by the stop key switch in the power-on state, the pickup assembly is moved to a position other than the predetermined position by the switch. The pickup assembly may be controlled to move to a position where it is detected as being in the position .
[0006]
Power on / off state determination method of the recording medium reproducing apparatus according to the present invention, a pickup assembly for reproducing a recording medium, a pickup assembly drive motor, and the recording medium reproducing state of the apparatus and the power-off state recording medium Whether the recording medium playback device having a playback mechanism including a power key switch for switching between a playable power-on state and a control circuit for controlling the playback mechanism was in a power-off state or a power-on state when the power supply was cut off A method for determining a power on / off state of a recording medium playback apparatus for determining the recording medium, wherein the pickup assembly is stopped at a predetermined position in the power off state, and when the recording medium is not played back in the power on state, the pickup assembly is moved to a position other than the predetermined position. The power supply is resumed after the power supply is cut off. When detects the position of the pick assembly, when the pickup assembly is in other than the predetermined position, and determines that the power supply is interrupted by a power-on state, when the pickup assembly is in place, the power supply in a power-off state Judged as blocked.
[0007]
[Action]
A reproduction mechanism including a pickup assembly for reproducing a recording medium and a pickup assembly driving motor, a control circuit for controlling the reproduction mechanism, and a microcomputer for controlling the operation of the control circuit. In a recording medium reproducing apparatus including a switch for detecting a predetermined position of the recording medium, the power on / off state at the time of power supply interruption is determined based on the detected on / off state of the switch When the power is turned on again, the playback device is started up in the power on / off state before the power supply is cut off.
If the recording medium is a CD disc, the switch can control the playback device based on the on / off state using a switch for detecting the innermost circumferential position of the CD disc, which is indispensable for the CD disc playback device.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram of an embodiment of a recording medium reproducing apparatus according to the present invention. In FIG. 1, as a recording medium playback apparatus, the configuration of a CD disk playback apparatus, that is, a CD mechanism 1, a CD control circuit 2, and a microcomputer 3 as in the conventional example of FIG. 4 has been deleted.
As shown in FIG. 2, the CD mechanism 1 has a pickup assembly 13 on which an optical pickup 14 is mounted from the inner periphery to the outer periphery of a CD disk (not shown) mounted on the disk turntable 11 by a drive motor (not shown). The guide rail 12 is configured to be slidable. The pickup assembly 13 is provided with a switch SW1 for detecting the innermost peripheral position (the TOC data reading position of the CD disk).
The switch SW1 is turned on when the pickup assembly 13 is in the innermost peripheral position, and is turned off when the pickup assembly 13 is in the other position. The switch SW1 is indispensable for reading the TOC information of the CD disk, and is a component that is always attached to the CD mechanism 1.
[0009]
In the present invention, the power is turned on / off (the power is always supplied to the microcomputer 3 and the power is turned on / off to other circuit parts) using the switch SW1 after the power supply is cut off due to a power failure or the like. 3 is read, the state of the switch SW1 is read in the microcomputer reset process shown in FIG. 3, and the playback device is started up in a state (power on / off) similar to the state before the power is turned off.
[0010]
3 to 5 are examples of flowcharts for explaining the operation of the pickup position control by the microcomputer 3 when the present invention is implemented.
FIG. 3 shows a flowchart of the microcomputer reset process at power-on. When the reset process is instructed (step S1), the state of the switch SW1 (the position of the pickup) is read (S2), and whether or not the switch SW1 is on. (S3), if the switch SW1 is in the on state (that is, the pickup is at the innermost peripheral position), it is recognized that the power state at the time of the previous power supply off is off and is stored in the internal memory of the microcomputer 3 Store (S4), start the playback device in the power-off state (standby state) (S5), and if the switch SW1 is off, the microcomputer recognizes that the power state at the previous power supply off is on 3 is stored in the internal memory 3 (S6), and the playback device is started up in the power-on state (S7).
[0011]
Next, FIG. 4 is a flowchart example of pick-up position control processing when the power is turned on / off by the power key switch input when the playback device is stopped in the power supply state, and whether the power key switch is turned on. If it is on, the process proceeds to step S12, and if it is off, step S11 is repeated. Next, in step S12, it is confirmed whether or not the current power is off. If it is off, the power-on state is stored in the memory (S13), and the pickup 14 is sent to the outer periphery by the pickup assembly driving motor (S14). It is confirmed whether or not SW1 has moved to a position where it is turned off (S15). If it is an off position, the process proceeds to step S16, and if it is not an off position, step S15 is repeated again. Next, the motor is stopped when the current OFF position is reached in step S16.
[0012]
Further, when the power key switch is turned on, if the current power is not turned off in step S12 (that is, if the current power is turned on), the power off state is stored in the memory (S17), and the switch SW1 is on. (S18), if it is in the on state, the pickup 14 is sent by the motor in the outer circumferential direction (S19). If it is not in the on state, the process proceeds to step S21 to be described later. Next, it is confirmed whether or not the switch SW1 has been moved to the off position (S20). If it is in the off position, the process proceeds to step S21, and if it is not in the off position, step S20 is repeated again. In step S21, the pickup 14 is fed by the motor in the reverse direction, that is, in the inner circumferential direction, and then it is confirmed whether or not the switch SW1 is turned on (S22). repeat. Next, at step 16, the pickup assembly driving motor is stopped.
That is, the switch SW1 is turned on when the playback apparatus is stopped in the power supply state and the switch SW1 is turned off in the power-on state.
After the above operation is completed, even if the power supply is cut off, the position of the pickup when power is turned on again is set to the same state as before the power cut-off by detecting the state of the switch SW1 as in the flowchart example of FIG. A playback device can be launched.
[0013]
Next, FIG. 5 shows processing during playback and stop operation (pickup position initialization processing) of the playback device. (A) is a stop during power supply → pickup operation during playback, and (B) is a power supply. This is a pick-up operation during playback → stop.
(A) is a process of moving the pickup to the innermost circumference in order to read the TOC information of the CD disc when a reproduction instruction is given from the current stop state.
That is, when playback is instructed by input of the playback key switch during stoppage, it is first checked whether or not the switch SW1 is in the on state (S31). If it is in the on state, the pickup 14 is sent by the motor in the outer circumferential direction (S32). ), If not in the ON state, the process proceeds to step S34 described later. Next, it is confirmed whether or not the switch SW1 has been moved to the off position (S33). If it is in the off position, the process proceeds to step S34, and if it is not in the off position, step S33 is repeated again. In step S34, the pickup 14 is fed by the motor in the reverse direction, that is, in the inner circumferential direction. Then, it is confirmed whether or not the switch SW1 is turned on (S35). repeat. Next, at step 16, the pickup assembly driving motor is stopped. Thereafter, the reproduction operation is started.
Steps S32 to S35 are operation processes for reconfirming the position of the pickup 14.
[0014]
Next, (B) is a pickup moving process according to the current power on / off state after the stop by the stop instruction from the current reproduction state. If the stop is in the power on state, the pickup is moved to the off position of the switch SW1. If it is stopped in the power-off state (when the power is turned off during reproduction), the pickup is moved to the ON position of the switch SW1 and stopped.
That is, when stop is instructed by the stop key switch input during the reproduction operation, first, it is confirmed whether or not the switch SW1 is in an OFF state (S41). It progresses to below-mentioned step S44. When the off state is confirmed in step S41, the pickup 14 is sent in the inner circumferential direction by the motor (S42), and then it is confirmed whether or not it has been moved to the on position of the switch SW1 (S43). If it is not the ON position, step S43 is repeated again. Next, in step S44, it is confirmed whether or not the power is currently on. If the power is on, the process proceeds to step S45. If not, the process proceeds to step S47 described later. In step 45, the pickup 14 is sent in the outer circumferential direction by a motor, and then it is confirmed whether or not the switch SW1 is turned off (S46). If it is off, the process proceeds to step 47. If not, step S46 is repeated. Next, at step 47, the pickup assembly driving motor is stopped.
[0015]
That is, the switch SW1 is turned off when playback is stopped in the power-on state, and the switch SW1 is turned on when stopped in the power-off state (when power is turned off during playback). After the above operation is completed, even when the power is turned off, when the power is turned on again, the state of the switch SW1 is detected from the flowchart of FIG.
The reason why the pickup 14 is once moved to the switch SW1 on position in the above operation is to stop the pickup 14 at a position as close as possible to the on position of the switch SW1.
Since the pickup assembly 13 is moving in the outer circumferential direction during reproduction, the switch SW1 is in an off state when the power supply is interrupted during reproduction. Therefore, when the power is turned on again, it starts up in the power-on state from the flowchart of FIG.
[0016]
According to the recording medium reproducing apparatus of the embodiment of the present invention, an apparatus having a backup function can be provided with a backup function using existing components without using a special backup circuit or the like. Can reduce the cost.
[0017]
As mentioned above, although one Example of this invention was described, this invention is not restricted to this, A various deformation | transformation is possible. For example, there is a method of detecting an OFF position by a timer in the ON → OFF operation of the switch SW1 of the pickup assembly. Management is performed by the time when the switch SW1 is turned off.
Further, in place of the position detection switch described above, a switch essential to a CD mechanism or the like, for example, a home position switch by a reproduction mechanism, pickup, turntable or the like is included in the case of a changer type CD. A predetermined position detection switch of the traverse unit can be used in the present invention. Further, not only one switch but also a combination of a plurality of switches may be used.
Further, an event other than the power on / off state may be determined.
[0018]
According to the recording medium playback apparatus and the recording medium playback apparatus power on / off state determination method according to the present invention, a backup function can be provided without using a special backup circuit or the like, and the cost on the circuit can be reduced. Can do.
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of a recording medium playback apparatus according to the present invention.
FIG. 2 is a schematic view of a specific configuration of the CD mechanism in FIG.
FIG. 3 is a flowchart illustrating an operation of pickup position control by a microcomputer when the present invention is carried out, and shows a flowchart of microcomputer reset processing.
FIG. 4 is an example of a flowchart for explaining the operation of pick-up position control by a microcomputer when carrying out the present invention, and the power is turned on / off by the power key switch input when the playback device is stopped in the power supply state. The flowchart of the position control process of the pickup in the case is shown.
FIG. 5 is an example of a flowchart for explaining an operation of pick-up position control by a microcomputer when carrying out the present invention, and shows a process (pick-up position initialization process) at the time of reproduction and stop operation of the reproduction apparatus.
FIG. 6 is a block diagram of an example of a conventional CD disk playback device.
[Explanation of symbols]
1 CD mechanism 2 CD control circuit 3 Microcomputer 11 Disc turntable 12 Guide rail 13 Pickup assembly 14 Optical pickup SW1 Pickup position detection switch

Claims (4)

In a recording medium reproducing apparatus comprising a reproducing mechanism including a pickup assembly for reproducing a recording medium, a pickup assembly driving motor, and the like, and a control circuit for controlling the reproducing mechanism,
The reproduction mechanism includes a switch for detecting whether the pickup assembly is at a predetermined position or other than a predetermined position;
A power key switch for switching the state of the recording medium reproducing device between a power-off state and a power-on state capable of reproducing the recording medium;
The control circuit controls the movement of the pickup assembly to a position where the switch detects that the pickup assembly is in a predetermined position when the power is off , and the recording medium reproducing apparatus is in the power on state. Is moving the pickup assembly to a position where the switch detects that the pickup assembly is located at a position other than a predetermined position when the recording medium is not reproduced .
Determining that the power supply is cut off in the power-on state when the pickup assembly is in a position other than the predetermined position; and determining that the power supply is cut off in the power-off state when the pickup assembly is in the predetermined position;
A recording medium reproducing apparatus characterized by the above. The reproduction mechanism has a reproduction key switch for starting reproduction of the recording medium,
The control circuit moves the pickup assembly to a position where the switch detects that the pickup assembly is located at a position other than a predetermined position when reproduction of the recording medium is not started by the reproduction key switch in the power-on state. Moving control,
The recording medium reproducing apparatus according to claim 1. The reproduction mechanism has a stop key switch for stopping reproduction of the recording medium,
When the reproduction of the recording medium is stopped by the stop key switch in the power-on state, the control circuit moves the pickup assembly to a position where the switch detects that the pickup assembly is not in a predetermined position. Controlling,
The recording medium reproducing device according to claim 1 or 2, characterized by the above-mentioned. A reproduction mechanism including a pickup assembly for reproducing a recording medium, a pickup assembly driving motor, and a power key switch for switching the state of the recording medium reproducing apparatus between a power-off state and a power-on state capable of reproducing the recording medium When, a power on / off state determination method of the recording medium reproducing apparatus to determine whether the recording medium reproducing apparatus and a control circuit for controlling the regeneration mechanism was powered on or was powered off when the power supply cut-off ,
In the power-off state, the pickup assembly is stopped at a predetermined position,
When the recording medium is not reproduced in the power-on state, the pickup assembly is disposed at a position other than the predetermined position,
When the power supply is resumed after the power supply is cut off, the position of the pick assembly is detected,
Determining that the power supply is cut off in the power-on state when the pickup assembly is in a position other than the predetermined position; and determining that the power supply is cut off in the power-off state when the pickup assembly is in the predetermined position;
A method for determining a power on / off state of a recording medium reproducing apparatus.

Images