JP3473747B2 - Disk unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device.

[0002]

2. Description of the Related Art Conventionally, in a disk device such as a portable MD device, DC power is supplied to the device body by connecting an output terminal of an AC adapter connected to a commercial AC power source to an input terminal of the device body. However, the built-in secondary battery is charged by the DC power source or the device main body is operated, and the built-in secondary battery is charged by the surplus power even when the device main body is operating. Things were also proposed.

In a disk device such as a portable MD device, the data read from the disk is stored in a memory, and the data stored in the memory is read at a speed slower than the reading speed from the disk. Since the data is played back, the data reading from the disk is stopped when the amount of data accumulated in the memory reaches the maximum value. At this time, the timing of restarting the data reading is shortened to increase the amount of data accumulated in the memory. There is a system that keeps the power at a high level, a system that delays the timing of restarting data reading to save power, and a system that allows the user to arbitrarily select either. Was proposed.

[0004]

By the way, as in the former case of the above conventional apparatus, the built-in secondary battery is charged by the surplus power from the AC adapter during the operation of the apparatus body, and the latter case of the above conventional apparatus. As described above, there is a mode switching between a continuous operation mode in which the timing of restarting data reading is accelerated to keep the amount of data stored in the memory at a high level and a power saving mode in which the timing of restarting data reading is delayed to save power. When combined with something that is operated by the user's operation, continuous operation is performed in situations where a large amount of large vibration is expected to occur, such as when power is supplied from the car battery. The mode is set to the power saving mode in situations where it is expected that almost no vibration will occur, such as when power is supplied from a commercial power source at home. By switching, it is possible to charge the built-in secondary battery in a short time while suppressing the occurrence of skipping, etc., but each time the device is driven, the user judges the usage status and switches to the optimum mode. Must be,
There is a problem that the user needs complicated operations.

An object of the present invention is to provide a disk device which can suppress sound skipping and can be charged in a short time without requiring a complicated operation by a user.

[0006]

In order to achieve the above object, the present invention stores data read from a disk in a memory and uses the data stored in the memory at a speed slower than the reading speed from the disk. In a disk device for performing a reproducing operation for reading by supplying power from a built-in secondary battery, first and second power input means for receiving power from the outside of the device, and power supply from the first or second power input means And a control means for charging the built-in secondary battery by the surplus power while the above-mentioned regenerating operation is performed by the control means .
And battery case or charging
When the reproducing operation is performed by receiving the power supply from the first power supply input means to which the table is selectively connected, the first mode in which data is intermittently read from the disk is set, and the second mode is set.
When the reproduction operation is performed by receiving the power supply from the power input means, the second mode for controlling continuous reading of data from the disc is controlled.

Therefore, according to the present invention, when the power is supplied from the first or second power input means, the control means performs the reproducing operation by the power supply from the first or second power input means. Or charging the built-in secondary battery with surplus power, while receiving a power supply from the first power input means to perform a reproducing operation, and when receiving a power supply from the second power input means. By changing the method of reading the data from the disc when performing the reproducing operation, for example, when the power is supplied from the first power input means, the drive is performed in the power saving mode,
When the power is being supplied from the second power input means, it can be driven in the continuous operation mode.

According to the present invention, in addition to the above structure, the first power source input means comes into contact with a first output terminal formed on the charging stand when the apparatus main body is placed on the charging stand. In addition, it has an input terminal portion that comes into contact with the second output terminal formed on the battery case when the battery case is attached to the apparatus body.

Therefore, according to the present invention, when the apparatus body is placed on the charging stand, the apparatus body contacts the first output terminal formed on the charging stand, and the battery case is attached to the apparatus body. By configuring the first power supply input means by the input terminal portion that is in contact with the second output terminal formed in the battery case, when the device body is placed on the charging stand or in the battery case in the device body. Can be driven in a power saving mode, for example.

According to the present invention, in addition to the above structure, the input terminal portion, as the battery case, boosts an output voltage of a battery housed in the battery case and supplies the boosted voltage to a second output terminal. In the case of using a circuit having a circuit and a third output terminal connected to the battery without passing through the booster circuit, a first input terminal in contact with the second output terminal and the first And a second input terminal that is in contact with the third output terminal, and the first signal line extending from the first input terminal is connected to the built-in secondary battery, various drive circuits, and the second input terminal. Off when the second signal line extending from the second output line is connected and the third output terminal is connected to the second input terminal between the first signal line and the second signal line. A switching element for switching is interposed.

Therefore, according to the present invention, when the main body of the apparatus is placed on the charging stand, the first output terminal and the second input terminal come into contact with each other and the switching element is turned on.
Power can be supplied to the built-in secondary battery and various driving circuits through the second signal line, the switching element, and the first signal line, and when the battery case is attached to the main body of the device, the second output terminal and Supplying power to the built-in secondary battery and various drive circuits through the first signal line when the first input terminal and the third output terminal are in contact with the second input terminal and the switching element is turned off. You can

Further, in the present invention, in addition to the above structure, the second power supply input means has a third input terminal to which a fourth output terminal formed in an adapter for supplying a DC voltage can be connected. Then, the third signal line extending from the third input terminal is connected to the first signal line through the overvoltage protection circuit, while the second signal line is connected to the overvoltage protection circuit and the switching element. It is connected through.

Therefore, according to the present invention, when the adapter is connected to the apparatus main body, the fourth output terminal and the third input terminal come into contact with each other, whereby the third signal line, the overvoltage protection circuit, and the first Power can be supplied to the built-in secondary battery and various drive circuits through the signal line of, while the first output terminal and the second input terminal come into contact with each other when the device body is placed on the charging stand, When the switching element is turned on, power can be supplied to the built-in secondary battery and various drive circuits through the second signal line, the switching element and the overvoltage protection circuit, and the first signal line.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing the electrical construction of an MD device which is an embodiment of the disk device of the present invention.
2 is a perspective view showing an external configuration of the MD device, and FIG.
It is a circuit diagram which shows the electric constitution of the power supply part in D device.

An MD device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 to 3, reference numeral 1 denotes a spindle motor for rotationally driving a disk (not shown) mounted on the main body of the apparatus, or a disk rotatively driven by the spindle motor for irradiating a light beam. An optical pickup that reads data recorded on a disc, a magnetic head that writes data to the disc by interaction with the optical pickup, a slide motor that moves the optical pickup or magnetic head in the radial direction of the disc, a slide motor or a spindle motor. Drive circuit that drives the
The recording / reproducing unit includes a servo circuit that controls the position of the slide motor, the rotation of the spindle motor, and the drive of the objective lens that constitutes the optical pickup, and an RF amplifier that amplifies the data read by the optical pickup.

Reference numeral 2 denotes a signal processing unit for subjecting the data reproduced from the disc by the recording / reproducing unit 1 and the data recorded on the disc by the recording / reproducing unit 1 to a decompression process and a compression process.
Is a memory for storing the compressed data signal-processed by the signal processing unit 2 and the compressed data reproduced from the disc by the recording / reproducing unit 1. At the time of data recording by the data compression / decompression process in the signal processing unit 2 and the memory 3. In addition, it is possible to generate a time during which the recording / reproducing unit 1 does not need to operate during reproduction.

Reference numeral 4 denotes digital signal supplied from the signal processor 2 to analog data and supplied to an audio signal output terminal, or analog data supplied from an audio signal input terminal to digital data for signal processing. A signal converter 5 supplied to the unit 2 is a main controller that controls the entire system of the MD device.

Reference numeral 6 denotes a power supply section for supplying power to each circuit section, and four input terminals 6a, 6b, 6c and 6d,
Between the three output terminals 6e, 6f and 6g, the secondary battery 6h connected between the signal line between the input terminal 6b and the output terminal 6f and the ground, and between the input terminal 6a and the output terminal 6e. signal line and a secondary battery 6h between the connected overvoltage protection circuit 6i to the signal line, an overvoltage protection circuit 6 i and the output terminal 6e
A diode 6j connected to a signal line that connects the signal line and a signal line between the overvoltage protection circuit 6i and the input terminal 6a and a signal line between the input terminal 6c and the output terminal 6g. P-channel type MOS-F connected to
The ET 6k, a resistor 6l connected between the signal line between the MOS-FET 6k and the input terminal 6a and the gate of the MOS-FET 6k, the ground contact of the input terminal 6a and the MOS-.
An NPN transistor 6m having a collector and an emitter connected between the gate of the FET 6k and an input terminal 6c.
And the signal line between the MOS-FET6k and the transistor 6
a resistor 6n connected to the base of m, a resistor 6o connected to the base-emitter of the transistor 6m,
It is composed of a signal line between the input terminal 6c and the resistor 6n and a resistor 6p connected between the ground. still,
Since the secondary battery 6h cannot be used due to repeated charging and discharging, it is preferable that the secondary battery 6h be configured to be detachable from the apparatus main body A.

The recording / reproducing section 1, the signal processing section 2, the memory 3, the signal converting section 4, the main control section 5 and the power source section 6 constitute an apparatus main body A.

7a, 7b and 7c are output terminals, 8 is a dry battery connected between the output terminals 7a and 7c, 9 is a resistor connected between the output terminal 7a and the dry battery 8 and 10
Is connected between the output terminal 7b and the dry cell 8 and
Is a booster circuit for boosting and outputting the voltage of a predetermined voltage to a predetermined voltage. The output terminal 7a, 7b, 7c, the resistor 9 and the booster circuit 10 constitute a battery case B. A dry cell 8 is detachably provided.

Reference numeral 11 is an input terminal, 12a and 12b are output terminals, 13 is a protection circuit connected to a signal line between the input terminal 11 and the output terminal 12a, and these input terminal 11 and the output terminals 12a and 12b are connected to each other. A charging stand C is constituted by the protection circuit 13.

Reference numeral 14 denotes an output terminal which can be inserted into and removed from the input terminal 6a of the apparatus main body A and the input terminal 11 of the charging stand C. The output terminal 14 and a circuit portion for converting the AC power supply into the DC power supply (not shown). AC adapter D is configured by

The operation of the MD device constructed as described above when the battery case B is connected to the device body A will be described first.

When the battery case B is connected to the apparatus main body A,
Input terminals 6b, 6c, 6d of the device body A and a battery case B
The output terminals 7b, 7a and 7c of the battery are respectively brought into contact with each other, and the voltage boosted to about 3.3V by the booster circuit 10 is applied to the input terminal 6b via the output terminal 7b, and the inter-terminal voltage of the dry cell 8 is It is applied to the input terminals 6c and 6d via the output terminals 7a and 7c. At this time, resistors 9 and 6
Since p and 6.8kΩ and 15kΩ are set,
When the voltage of the dry battery 8 is set to about 1.5V, the input terminal 7
The voltage applied to c is about 0.9 to 1.0 V because a little current also flows on the MOS-FET 6k side.

Then, the voltage applied to the input terminal 6b supplies power to the recording / reproducing section 1, the signal processing section 2 and the main control section 5 via the output terminal 6f, and the secondary battery is supplied by the surplus voltage. Input terminal 6 while charging for 6h
The voltage applied to c is output to the main controller 5 via the output terminal 6g.
Is connected to the battery case B, and the remaining capacity of the dry battery 8 mounted in the battery case B can be detected.

At this time, the voltage applied to the input terminal 6c is also applied to the transistor 6m, but since the resistors 6n and 6o are set to 100 kΩ and 27 kΩ, they are applied to the transistor 6m. Since the base-emitter voltage becomes about 0.3V and does not reach 0.5V at which the transistor 6m turns on, the transistor 6m maintains the off state, and accordingly, the MOS-FET 6k.
Also, since the off state is maintained, the voltage applied to the input terminal 6c is not supplied to the overvoltage protection circuit 6i. Actually, the voltage applied to the input terminal 6c is
It is supplied to the overvoltage protection circuit 6i through the diode built in the ET 6k, but since the voltage after passing through the diode becomes a very low value, unnecessary current consumption can be prevented. There is.

On the other hand, in the main controller 5, the output terminal 6g
When it is detected that the battery case B is connected by detecting the voltage supplied via the, the main control unit 5 shifts to the power saving mode, and in the data reproduction in the power saving mode, , The signal processing unit 2 to control the memory 3
To read the data stored in
While outputting the data to the outside through the signal conversion unit 4 and the audio signal output terminal, the capacity of the data stored in the memory 3 is recognized by the control data from the signal processing unit 2, and it is recognized that the amount becomes less than a predetermined amount. Then, the recording / reproducing unit 1 is driven to start reading data from the disc,
The data is stored in the recording medium, and when it is recognized that the amount of data exceeds a predetermined amount, the recording / reproducing unit 1 is stopped to control reading of data from the disc.

In the data recording in the power saving mode, the main controller 5 controls the signal processor 2 to compress the data input to the audio signal input terminal via the signal converter 4. The recording / reproducing unit 1 is driven when the capacity of the data stored in the memory 3 is recognized by the control data from the signal processing unit 2 and when it is recognized that the amount exceeds a predetermined amount. Start writing data to the disc, and when it is recognized that the amount has dropped below the specified amount,
The recording / reproducing unit 1 is stopped to control the writing of data to the disc.

Therefore, according to the above operation control, when the battery case B is attached to the apparatus main body A, the operation mode of the apparatus main body A is automatically set to the power saving mode, so that the recording / reproducing unit 1 is stopped. The secondary battery 6h can be charged with a larger amount of current during the running period.

Moreover, while the recording / reproducing unit 1 is being driven, power is supplied to each circuit unit including the recording / reproducing unit 1 by the secondary battery 6h and the dry battery 8 which are charged during the stop period. In this case, the maximum value of the load applied to the dry cell 8 can be reduced, so that the consumption caused by the heavy load on the dry cell 8 can be reduced, and the life of the dry cell 8 can be extended. it can.

In the above operation control, both the reproducing operation and the recording operation are operated in the power saving mode. However, the present invention is not limited to this, and the data to be recorded on the disc is transmitted to the main body A of the apparatus. If data is unilaterally input, data write omission occurs when the data stored in the memory 3 overflows. Therefore, the drive state of the recording / reproducing unit 1 can be maintained and the disc can be recorded. When the changed data is stored in the memory 3, the data may be read and recorded on the disc by the recording / reproducing unit 1.

Next, the operation when the apparatus main body A is placed on the charging stand C will be described.

When the apparatus main body A is placed on the charging stand C, the input terminals 6c and 6d of the apparatus main body A and the output terminal 12 of the charging stand C are placed.
a and 12b come into contact with each other, and a voltage of about 5V via the protection circuit 13 is applied to the input terminal 6c via the output terminal 12a.

The voltage applied to the input terminal 6c is supplied to the main control section 5 via the output terminal 6g, and the charging stand C
It has become possible to detect that it has been placed on. At this time, the voltage applied to the input terminal 6c is
Since the resistance 6n and the resistance 6o are set to 100 kΩ and 27 kΩ, respectively, the base-emitter voltage applied to the transistor 6m is about 0.6V, and the transistor 6m is turned on at 0.5V. Therefore, the transistor 6m is turned on, and the MOS-FET 6k is also turned on accordingly. Therefore, the voltage applied to the input terminal 6c is supplied to the overvoltage protection circuit 6i via the MOS-FET 6k. After the diode 6
It is applied to the output terminal 6f and the secondary battery 6h via j.

Then, power is supplied to the recording / reproducing section 1, the signal processing section 2 and the main control section 5 through the output terminal 6f,
The secondary battery 6h is charged by the surplus voltage.

On the other hand, in the main controller 5, the output terminal 6g
If it is detected that the battery is placed on the charging stand C by detecting the voltage supplied via the main controller 5, the main control unit 5 shifts to the power saving mode and reproduces the data in the power saving mode. Controls the signal processing unit 2 to read out the data stored in the memory 3 and perform decompression processing, and outputs the data to the outside via the signal conversion unit 4 and the audio signal output terminal. The capacity of the data stored in the memory 3 is recognized by the control data from the unit 2, and when it is recognized that the amount is less than or equal to a predetermined amount, the recording / reproducing unit 1 is driven to start the data reading from the disk, Data is stored in 3, and when it is recognized that the amount of data exceeds a predetermined amount, the recording / reproducing unit 1 is stopped to control reading of data from the disc.

In the data recording in the power saving mode, the main control unit 5 controls the signal processing unit 2 to compress the data input to the audio signal input terminal via the signal conversion unit 4. The recording / reproducing unit 1 is driven when the capacity of the data stored in the memory 3 is recognized by the control data from the signal processing unit 2 and when it is recognized that the amount exceeds a predetermined amount. Start writing data to the disc, and when it is recognized that the amount has dropped below the specified amount,
The recording / reproducing unit 1 is stopped to control the writing of data to the disc.

Therefore, according to the above operation control, when the apparatus main body A is placed on the charging stand C, the operation mode of the apparatus main body A is automatically set to the power saving mode. During the stopped period, the secondary battery 6h can be charged with more current.

In the above operation control, both the reproducing operation and the recording operation are operated in the power saving mode. However, the present invention is not limited to this, and the data to be recorded on the disc is transmitted to the main body A of the apparatus. If data is unilaterally input, data write omission occurs when the data stored in the memory 3 overflows. Therefore, the drive state of the recording / reproducing unit 1 can be maintained and the disc can be recorded. When the changed data is stored in the memory 3, the data may be read and recorded on the disc by the recording / reproducing unit 1.

Next, the operation when the AC adapter D is inserted into the apparatus main body A will be described.

When the AC adapter D is inserted into the apparatus body A, the input terminal 6a of the apparatus body A and the output terminal 14 of the AC adapter D contact each other, and a voltage of about 5V is applied to the input terminal 6a via the output terminal 14. The voltage is applied to the output terminal 6e via the overvoltage protection circuit 6i and applied to the output terminal 6f and the secondary battery 6h via the overvoltage protection circuit 6i and the diode 6j.

Then, the voltage applied to the input terminal 6a is supplied to the recording / reproducing section 1, the signal processing section 2 and the main control section 5 via the output terminal 6f, and the secondary battery 6h is supplied by the surplus voltage. While being charged, the power is supplied to the main controller 5 through the output terminal 6e, and it is possible to detect that the AC adapter D is inserted.

On the other hand, in the main controller 5, the output terminal 6e
When it is detected that the AC adapter D is inserted by detecting the voltage supplied via the, the main control unit 5 shifts to the continuous operation mode, and in the data reproduction in the continuous operation mode. , The signal processing unit 2 is controlled to read the data stored in the memory 3 to perform the decompression process, and the data is externally output via the signal conversion unit 4 and the audio signal output terminal, while the signal processing unit is output. When the capacity of the data stored in the memory 3 is recognized by the control data from the control unit 2 and it is recognized that the storage capacity is full, the recording / reproducing unit 1
Control is performed to perform idle reading (maintaining the driving state), and when it is recognized that the capacity capable of storing data has been secured, the data read from the disk is stored in the memory 3.

In the data recording in the continuous operation mode, the main controller 5 controls the signal processor 2 to compress the data input to the audio signal input terminal via the signal converter 4. On the other hand, the volume of the data stored in the memory 3 is recognized by the control data from the signal processing unit 2 while the data is stored in the memory 3, and when the data amount of a predetermined unit that can be recorded in the disc is recognized, the recording is performed. When the reproduction unit 1 is driven to start writing data to the disc and it is recognized that the amount of data of a predetermined unit that can be recorded on the disc is not reached, the recording / reproduction unit 1 is controlled to perform blank writing (the drive state is Control).

Therefore, according to the above operation control, when the AC adapter D is inserted into the apparatus body A, the operation mode of the apparatus body A is automatically set to the continuous operation mode.
It is possible to reliably prevent skipping of sound due to vibration or the like.

Next, the operation when the battery case B is connected to the apparatus main body A and the AC adapter D is also inserted will be described.

When the battery case B is connected to the apparatus body A and the AC adapter D is also inserted, the input terminal 6 of the apparatus body A
b, 6c, 6d and the output terminals 7b, 7a of the battery case B,
7c and the input terminal 6a of the apparatus main body A and the output terminal 14 of the AC adapter D contact each other, and the voltage boosted to about 3.3V by the booster circuit 10 is input terminal 7b via the output terminal 7b. 6b, and the voltage between the terminals of the dry battery 8 is input terminals 6c, 6d via the output terminals 7a, 7c.
In addition, a voltage of about 5V is further applied to the input terminal 6a via the output terminal 14.

When the voltages applied to the input terminal 6a and the input terminal 6b are compared, the voltage applied to the input terminal 6a is higher, so that the voltage applied to the input terminal 6a passes through the output terminal 6f. Power is supplied to the recording / reproducing unit 1, the signal processing unit 2, and the main control unit 5, and the secondary battery 6h is charged by the surplus voltage, and the output terminal 6e
The main control unit 5 detects that the AC adapter D has been inserted by detecting the voltage supplied via the, and shifts to the continuous operation mode.

Therefore, according to the above operation control, when the battery case B is connected to the apparatus body A and the AC adapter D is inserted, the operation mode of the apparatus body A is automatically set to the continuous operation mode. Therefore, sound skipping due to vibration or the like can be reliably prevented.

Moreover, by inserting the AC adapter D, the connection between the emitter of the transistor 6m and the ground is released, and the transistor 6m maintains the off state.
Since the OS-FET 6k also maintains the off state, the voltage applied to the input terminal 6a is applied to the input terminal 6c and the output terminal 7a.
It is also possible to prevent application to the dry battery 8 via the.

Next, the apparatus main body A is placed on the charging stand C,
The operation when the AC adapter D is also inserted will be described.

The apparatus main body A is placed on the charging stand C, and the AC
When the adapter D is also inserted, the input terminal 6c of the device body A,
6d and the output terminals 12a and 12b of the charging stand are in contact with each other, and the input terminal 6a of the apparatus main body A and the output terminal 14 of the AC adapter D are in contact with each other, and a voltage of about 5V causes the output terminals 12a and 14 to be connected. It is applied to the input terminal 6c and the input terminal 6a via the respective terminals.

When the voltages applied to the input terminal 6a and the input terminal 6b are compared, they are almost the same, but when the AC adapter D is inserted, the connection between the emitter of the transistor 6m and the ground is released. Transistor 6
Since m maintains the off state and the MOS-FET 6k also maintains the off state, the voltage applied to the input terminal 6a is applied to the recording / reproducing unit 1, the signal processing unit 2, and the main control unit 5 via the output terminal 6f. The power is supplied, the secondary battery 6h is charged by the surplus voltage, and the main controller 5 detects that the AC adapter D is inserted by detecting the voltage supplied via the output terminal 6e. Detects and shifts to continuous operation mode.

Therefore, according to the above operation control, when the apparatus body A is placed on the charging stand C and the AC adapter D is inserted, the operation mode of the apparatus body A is automatically set to the continuous operation mode. Therefore, skipping of sound due to vibration or the like can be reliably prevented.

Moreover, by inserting the AC adapter D, the connection between the emitter of the transistor 6m and the ground is released and the transistor 6m maintains the off state.
Since the OS-FET 6k also maintains the off state, the voltage applied to the input terminal 6a is applied to the input terminal 6c and the output terminal 12.
It is also possible to prevent application to the protection circuit 13 via a.

In the above embodiment, the battery case B is connected to the apparatus main body A, the apparatus main body A is placed on the charging stand C, and the AC adapter D is inserted into the apparatus main body A. The power saving mode and the continuous operation mode are set assuming that the mobile phone is used on the go, used at home, and used in the car. It is not the case when the battery case B is connected to the apparatus main body A and the AC adapter D is inserted into the apparatus main body A in the power saving mode, and when the apparatus main body A is placed on the charging stand C. In such a case, the continuous operation mode may be set, or these settings may be arbitrarily set by the user.

[0059]

As described above, according to the present invention, a plurality of power supply methods are prepared, and the continuous operation mode or the power saving mode is automatically selected and operated depending on the difference in the power supply method to the apparatus main body. With this configuration, it is possible to automatically switch to the optimum mode according to the power supply status, so that it is not necessary for the user to judge the usage status each time the device is driven and switch to the optimum mode. , The usability can be improved.

Further, according to the present invention, the power supply from the charging stand and the battery case is configured to be received by the same input terminal, and the power supply from the charging stand is to measure the voltage of the battery in the battery case. The number of terminals formed on the main body of the device is configured by supplying power from the terminals to the built-in secondary battery and various drive circuits when the charging stand is set by the switching element. It is possible to prevent the internal circuit of the charging stand from being destroyed by the reverse current from the built-in secondary battery without using a diode, etc. It is also possible to prevent the voltage drop caused by the diode etc. when power is supplied from the battery case. That.

Further, according to the present invention, the power supply from the charging stand is supplied to the circuit for processing the power supply from the AC adapter via the switching element, thereby protecting the overvoltage due to the power supply from the AC adapter. Since the circuit can be shared by the power supply from the charging stand, it is possible to prevent the circuit scale of the apparatus main body from increasing.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment M of a disk device according to the present invention.
It is a functional block diagram which shows the electric constitution of D device.

FIG. 2 is a perspective view showing an external configuration of the MD device.

FIG. 3 is a circuit diagram showing an electrical configuration of a power supply unit in the MD device.

[Explanation of symbols]

1 Recording / playback section 2 Signal processing unit 3 memory 4 Signal converter 5 Main control unit 6 power supply

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-3-109625 (JP, A) JP-A-5-89469 (JP, A) JP-A-5-282676 (JP, A) JP-A-6- 96520 (JP, A) JP-A-6-302085 (JP, A) JP-A-6-302086 (JP, A) JP-A-6-318359 (JP, A) JP-A-8-87818 (JP, A) JP-A-8-203196 (JP, A) JP-A-8-339614 (JP, A) JP-A-9-213001 (JP, A) JP-A-9-245429 (JP, A) JP-A-10-188541 (JP, A) JP-A-11-144373 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B ^7/ 00-13/08 G11B 19/00-20/24 G11B 25 / 00-25/10 G11B 31/00-33/14 G06F 1/26-1/32 H02J 7/00-7/36

Claims (4)

(57) [Claims] 1. A disk device in which data read from a disk is stored in a memory and a reproducing operation for reading the data stored in the memory at a speed slower than the speed of reading from the disk is performed by supplying power from an internal secondary battery. In the first and second power supply input means for receiving power supply from outside the apparatus, and the reproduction operation is performed by power supply from the first or second power supply input means, and the built-in secondary power is supplied by surplus power. While the control means for charging the battery is provided, the control means supplies power from the battery case and the charging stand.
Then, the battery case or the charging stand is selectively connected. <br /> A first mode in which data is intermittently read from the disc when a reproducing operation is performed by receiving power supply from the first power supply input means. The disk device is characterized in that when the reproducing operation is performed by receiving the power supply from the second power supply input means, it is controlled to be in the second mode for continuously reading the data from the disk. 2. The first power input means is a first power input means formed on the charging stand when the apparatus body is placed on the charging stand.
2. The disk according to claim 1, further comprising an input terminal portion that is in contact with the output terminal of the device and is in contact with a second output terminal formed in the battery case when the battery case is attached to the apparatus body. apparatus. 3. The input terminal section, which serves as the battery case, includes a booster circuit that boosts an output voltage of a battery housed in the battery case and supplies the boosted output voltage to a second output terminal, and does not go through the booster circuit. When using a battery having a third output terminal connected to the battery, a first input terminal that contacts the second output terminal and a first input terminal that contacts the first and third output terminals The first input line extending from the first input terminal is connected to the built-in secondary battery, the various drive circuits, and the second signal line extending from the second input terminal. In addition, a switching element that is turned off when the third output terminal is connected to the second input terminal is interposed between the first signal line and the second signal line. The disk device according to claim 2. 4. The second power supply input means has a third input terminal to which a fourth output terminal formed on an adapter for supplying a DC voltage can be connected, and extends from the third input terminal. The third signal line is connected to the first signal line via the overvoltage protection circuit.
The second signal line is connected to the overvoltage protection circuit through the switching element while the second signal line is connected to the overvoltage protection circuit.
The disk device described.