JPH06103578B2 - Power control device for compact disk player - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc player, and more particularly to a power supply control device thereof for the purpose of power saving.

2. Description of the Related Art A portable device that uses a vehicle-mounted power source or a battery as a power source has been proposed for a compact disc player that has been conventionally used indoors, and power saving of an optical pickup and a motor circuit has been promoted. By the way, in the conventional compact disc player, after the power switch is turned on, the motor for the turntable is kept rotating to be able to respond to any subsequent operation (for example, play, skip, etc.).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, the motor and its control circuit are always energized in order to immediately respond to the next operation, so that a current of several hundred mA is constantly consumed here. On the other hand, it is possible to adopt a configuration in which all power supplies are shut off when the end of the recording area is detected, like a headphone player using a cassette tape.
A large power saving effect cannot be expected only by this.

SUMMARY OF THE INVENTION It is an object of the present invention to realize a large power saving of a compact disc player by controlling energization of a predetermined circuit portion after the main power switch is turned on and during a pause operation.

The present invention shows an information track discriminating means for discriminating that a predetermined information signal is read from an information track of a compact disc in an initial state after the main power switch is turned on, and the completion of the reading. The output circuit energizes the audio circuit by the output of the opening / closing control means for turning off the first switch provided in the power supply line for energizing the motor section and the audio circuit and the pause operation determining means when the pause operation is performed. It is characterized in that it is provided with a configuration for turning off the second switch provided in the power supply line.

According to the above-described configuration of the present invention, after a short initial drive after the main power switch is turned on, the power supply to the motor unit and the audio circuit is cut off (referred to as a standby state), and the motor unit is not powered during the pause operation. Is supplied, but the power supply to the audio circuit is cut off, so that power consumption can be greatly reduced.

Example Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a circuit diagram of the present embodiment, and FIGS. 3, 4, and 5 are flowcharts of main parts for explaining the operation.

1 is a power supply, 2 is a manually operated main power switch, and 3 is a power line on the secondary side of the main power switch. A pickup 4, a signal detector 5, and a controller 6 are connected to the power supply line 3. The control unit 6 is mainly composed of a microcomputer.

To the input side of the control section 6, the output of the signal detection section, a play (reproduction) switch 7, a stop (stop) switch 8 and a pause (temporary stop) switch 9 are connected. The control unit 6 includes a first switch 10 and a second switch 11 which will be described later.
Generates outputs P and Q that control opening and closing.

A motor unit 12 includes a motor 13 and a motor control circuit 14.
This motor unit 12 is connected to the power line 3 via the first switch 10.
It is connected to the. A second switch is connected to the power supply line 15 on the secondary side of the first switch 10, and an audio circuit 16 is connected to the secondary side of the second switch.

The control unit 6 and the hardware and software related to its input / output will be described as some organically combined function realizing means as follows.

Reference numeral 20 denotes an initial drive means, which generates an output R for driving the motor unit 12 when the main power switch 2 is turned on, similarly controls the drive of the optical pickup (not shown), and outputs the signal ( TOC: Table of Conte
nts: For example, a signal indicating the number of songs, the time of each song, etc.) is read. Reference numeral 21 denotes an information track discriminating means, which receives the output of the signal detecting section 5 and discriminates whether or not the reading of the information track is completed. Then, when the reading is completed (the TOC is stored in the memory (not shown)), a discrimination output is generated. The determination of the completion of reading may be either a method of directly determining the TOC or an indirect method of determining the TOC as it is stored in the memory.

Reference numeral 22 denotes a terminal signal discriminating means which receives the output of the signal detecting section 5 and produces a discriminating output when a signal (also referred to as a lead-out signal) indicating the terminal of the outermost track of the disc is detected.

Reference numeral 23 is a play operation discriminating means which is connected to the play switch 7 and detects ON when the play switch is operated, similarly 24 is a stop operation discriminating means and 25 is a pause operation discriminating means.

Reference numeral 26 denotes a pause operation control means, which turns off (opens) the second switch 11 by the output Q when the discrimination output of the pause operation discrimination means 25 is input (when the pause button is pressed). On the other hand, when the discriminating output of the play operation discriminating means 23 is input (when the play button is pressed), an output for turning on (closing) the second switch 11 is generated.

Reference numeral 27 is an opening / closing control means for opening and closing the first switch 10. The opening / closing control means 27 receives the discrimination outputs of the information track discrimination means 21, the end signal discrimination means 22, the play operation discrimination means 23, the stop operation discrimination means 24 and the output of the pause movement control means 26 as inputs. The relationship between the input signal and the opening / closing of the first switch 10 will be described below.

Input 1st switch 21: Completion of reading information track → Open (OFF) 22: End signal detection → Open (OFF) 23: Play operation → Close (ON) 24: Stop operation → Open (OFF) 26: Pause Operated → Closed (ON) The power supply terminals of the respective means 20 to 25 are connected to the secondary side of the main power supply switch 2, and when the main power supply switch 2 is turned on, the power supply voltage E is supplied to each means. It

Next, the operation will be described using a flowchart. When the main power switch 2 is turned on in step 30, the initial drive means 20
By this, the initial operation (step 31) is performed, and reading of the information track is started. Step 32 shows the discriminating operation of the information track discriminating means 21. The initial operation is continued until the reading of the information track is completed, and the first switch 10 is turned off in step 33 when the reading of the information track is completed.
This is the standby state, the motor section 12, the audio circuit 1
Power supply to 6 is cut off. At this time, the power supply to the optical pickup and the drive unit is also cut off. Therefore, power consumption is significantly reduced until the next operation. (It becomes approximately 1/10 or less of the initial operation.) The next operation is completely free, but for example, when a play operation is performed (step 34), the output of the play operation determination means 23 is generated and the opening / closing control means 27 is turned on. The first switch is turned on through (step 35), power is supplied to the motor unit 12 and the audio circuit 16 (others are omitted), and a play operation (step 36)
Is performed.

When the pause operation is performed from the standby state (the first switch 10 is in the off state), the pause operation control means 26 turns off the second switch 11 by the output of the pause operation determination means 25, and the open / close control means 27 is used. The first switch 10 is turned on. (The flow chart is omitted.) Therefore, the power supply of the audio circuit 16 is cut off, while the motor unit 12
Is supplied with power.

FIG. 4 shows a general pause operation and pause canceling operation. If the pause operation is performed during the play operation (step 36), the output of the pause operation determination means 25 is generated in step 37, and the pause operation control means 26 turns off the second switch 11 in step 38. At this time, the first switch 10 remains on. Therefore, when paused, the audio circuit 16
The power supply to the power supply is cut off, and the power consumption can be reduced.
It should be noted that the motor section 12 is supplied with power and the motor is rotating, so that the performance can be started immediately when the next pause is released.

The pause can be released by performing a play operation in step 39. Since it is a play operation, the second switch 11 is turned on via the pause operation control means 26 (step
40) In this way, the play operation is resumed.

As a method of canceling the paused state, for example, the pause button may be pressed again to generate an ON signal for the second time. Alternatively, a lock structure may be used as the pause button, and the lock is released by pressing the button again to pause off. It is needless to say that any of the above signals can be obtained, and any of them can be realized by a slight modification of FIG.

Next, as shown in FIG. 5, when the stop operation is performed during the play operation (step 36) (step 41), the first operation is performed via the opening / closing control means 27 by the output of the stop operation determining means 24.
The switch 10 is turned off (step 43) to enter the standby state. When there is no stop operation and the disc is reproduced (or skipped) and the disc termination signal is detected by the termination signal discriminating means 42 (step 42), the opening / closing control means 27 turns off the first switch 10 and stands by. State. Therefore, power is not supplied to both the motor section 12 and the audio circuit 16, and further, no power is supplied to the optical pickup section, resulting in a significant power reduction. Note that step 44 indicates the next operation, and any operation such as play, skip, or turning off of the main power switch may be performed.

As described above, according to this embodiment, after the main power switch is turned on, the initial operation is performed, and when the reading of the information track is completed, the power supply to the motor unit 12 and the audio circuit 16 is cut off. As a result, according to the experiments by the inventors, it is possible to reduce the power consumption in the standby mode by about 9/10 during the play. In addition, during the pause operation, the motor is energized for the next instant play when the pause is released, but by cutting off the power supply to the audio circuit, it is possible to reduce the power consumption by about 1/3.

EFFECTS OF THE INVENTION The present invention has a first power supply line on the secondary side of a main power switch.
And a second switch, so that the power supply to the audio circuit is cut off by turning off the second switch, and the power supply to both the motor section and the audio circuit is cut off by turning off the first switch. Since the initial operation is performed by turning on the main power switch and the first switch is turned off when the reading completion of the information track is determined, and the second switch is turned off by the pause operation, after the initial operation. In the standby state, the power supply to the audio circuit of the motor part is cut off, which realizes a large power saving, and the power supply to the audio circuit can be turned off at the time of pause, which greatly reduces the power consumption by the simple configuration. It was possible. In particular, when a battery is used as a power source, the life can be extended by about 2 to 3 times, and the device can be downsized by using a battery having a small capacity, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIGS. 3, 4, and 5 are flow charts for explaining the operation. 1 ... Power source, 2 ... Main power switch, 3 ... Power line, 5 ... Signal detection section, 9 ... Pause button, 10 ... First switch, 11 ... Second switch, 12 ... Motor section , 15 ……
Power line, 16 ... Audio circuit, 20 ... Initial drive means, 21 ... Information track determination means, 22 ... End signal determination means, 23 ... Play operation determination means, 24 ... Stop operation determination means, 25 ... ... Pause operation determination means, 26 ... Pause operation control means, 27 ... Open / close control means.

Claims (1)

[Claims] 1. A signal detecting means for detecting a read signal of an optical pickup, an initial driving means for starting an initial drive of a motor section by turning on a main power switch, and an information track directly or indirectly from an output of the signal detecting means. Information discriminating means for discriminating the completion of reading, discriminating end signal discriminating means for discriminating the end of recording of the disc from the output of the signal detecting means, and play discriminating the respective operation states of the play button, stop button and pause button. An operation discriminating unit, a stop operation discriminating unit, and a pause operation discriminating unit are provided, and a first switch is provided between the secondary side of the main power source switch and the power source line of the motor unit, and the secondary switch of the first switch is provided. A second switch is provided between the power supply line of the audio circuit and the power line of the audio circuit, and an information track discriminating hand is provided during the initial drive by turning on the main power switch. Receiving the signal indicating the completion of reading the information track output from the open / close control means for turning off the first switch, and receiving the signal output from the pause operation determination means for indicating the pause operation. Second
And a pause operation control means for turning off the switch.