JPH11243642A - Drive voltage supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the application of a connected apparatus whose specified drive voltage is different from a power supply voltage set with respect to a main apparatus. SOLUTION: Based on the power supply closing of a main apparatus 1, an initial drive voltage is supplied to a connected apparatus 2 from the power supply unit 12 of the main apparatus 1. On the basis of the supply of the initial drive voltage, voltage specification information is transmitted to the main apparatus 1. The main apparatus 1 receives the voltage specification information, determines the lowest operation guarantee voltage of the connected apparatus 2, and furthermore, with basis on determination result of the lowest operation guarantee voltage, supplies a predetermined drive voltage to the connected apparatus 2 from the power supply unit 12 of the main apparatus 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying a drive voltage between a main device and a connected device connected to the main device and receiving a voltage, for example, reproducing a magneto-optical disk, a magnetic tape, or the like. The present invention relates to a driving voltage supply method between a portable audio device and a connected device such as a remote controller that is detachably connected to the portable audio device and receives supply of a driving voltage from the portable audio device.

[0002]

2. Description of the Related Art A portable reproducing apparatus for reproducing a magneto-optical disk, a magnetic tape or the like such as a portable disk drive or a portable tape recorder is provided with an earphone or the like attached to the apparatus main body or sold as an option. A connection device is detachably connected and used.

Some earphones are provided with a remote controller in the middle of the earphone cord. The remote controller is configured to include, for example, an operation button that enables external remote control such as a volume knob and playback / stop of the playback device. The remote controller is further provided with a liquid crystal display unit including a liquid crystal display for externally displaying information such as the current operation state of the reproducing apparatus and the number of the music being reproduced. A drive voltage for driving the liquid crystal display unit is supplied to the earphone including the liquid crystal display unit from the playback device.

[0004] In the case of a connected device to which a drive voltage is supplied from a connected main device such as an earphone having a liquid crystal display unit, the supplied drive voltage is lower than the minimum operation guarantee voltage of the connected device. In this case, the voltage for driving the liquid crystal display unit is insufficient, and a predetermined display is not performed. Therefore, the connected equipment is generally set to have the lowest operation guarantee voltage lower than or equal to the power supply voltage set for the connected main equipment.

[0005]

In a main body device such as a portable reproduction apparatus, it is required to extend the reproduction time by reducing the size and weight and reducing the power consumption. Therefore, as a method of extending the reproduction time, it is essential for the main device to have a specification in which the set power supply voltage is lowered every time a new model is developed.

For this reason, in a main unit, when a new model is developed, its power supply voltage is set to be lower than the minimum operation guarantee voltage of the connected device used in the conventional model. In such a case, a drive voltage lower than the minimum operation assurance voltage is supplied to the connection device for the conventional model when used by connecting to the playback device of the new model. Therefore, the connected device for the conventional model does not work properly even when connected to the new model playback device itself and used.
An earphone or the like with a remote controller having a liquid crystal display unit cannot be used without turning on the liquid crystal display.

To give a more specific example, a portable reproducing apparatus for reproducing a magneto-optical disk or an optical disk housed in a cartridge has a power supply voltage of 2.8 V or higher of a conventional model. It had been. For this reason, the minimum operation guarantee voltage of the connected device such as the earphone corresponding to the conventional model is set to 2.7 V which is lower than the power supply voltage of the conventional reproducing apparatus. On the other hand, it is conceivable that the power supply voltage of the new type of reproducing apparatus is set to 2.6V. In such a case, in the playback device of the new model, in order to normally drive the liquid crystal display unit provided in the connected device, the connected device whose minimum operation guarantee voltage is set to 2.6 V or less corresponding to the new model is used. Connected and used. However, when the connected device compatible with the conventional model is connected to a new type of reproducing apparatus, the voltage supplied from the power supply unit is 2.6 V lower than the minimum operation guarantee voltage, and thus the predetermined value is displayed on the liquid crystal display unit. The display does not light up and cannot be used.

As described above, in the case of a main unit such as a new type of reproducing apparatus, if the power supply voltage is set lower than the minimum operation guarantee voltage of the connected device corresponding to the conventional type, the reproducing apparatus of the conventional type It could not be used even if the connection device attached to the main device or sold as an option was connected. Therefore, when a main unit such as a reproducing apparatus is replaced with a new model, there is a problem that a connected device such as an earphone used for a conventional model cannot be used.

Therefore, the present invention is applicable to a conventional model even when a power supply voltage set for a new model main unit is set lower than the minimum operation guarantee voltage of a connected device corresponding to the conventional model. The present invention has been proposed for the purpose of providing a drive voltage supply method that enables the use of a connected device.

[0010]

A drive voltage supply method according to the present invention for achieving the above object provides a drive voltage between a main device and a connected device connected to the main device and receiving a voltage. In the method, an initial drive voltage is supplied from the power supply unit to the connected device based on power-on in the main device, and voltage specification information is transmitted from the connected device to the main device based on the supply of the initial drive voltage, After determining the minimum operation guarantee voltage of the connected device in the main device based on the reception of the specification information, the main device supplies a predetermined drive voltage to the connected device.

According to the driving voltage supply method of the present invention,
Even if a connected device with a different voltage specification from the main device is connected, the main device determines the minimum operation guarantee voltage of the connected device and supplies a drive voltage higher than the specified minimum operation guarantee voltage to the connected device. Is done. Therefore, according to the drive voltage supply method according to the present invention, even for a connection device having a minimum operation guarantee voltage specification higher than the power supply voltage of the main device,
This is determined in the main device and can be used to supply a drive voltage at which the connected device can operate.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The drive voltage supply method according to the present embodiment is applied between a portable disk reproducing device 1 and an earphone unit 2, as shown in FIG. The disc reproducing apparatus 1 is loaded with a disc cartridge D in which an optical disc is rotatably stored, and information recorded in advance on the optical disc is listened to by the earphone unit 2. The disk reproducing device 1 has a power supply voltage set to 2.6V. As the earphone unit 2, the specification of the minimum operation guarantee voltage attached as a standard accessory to the disc reproducing apparatus 1 is set to 2.6 V or less (hereinafter, referred to as the earphone unit 2 a), and the power supply voltage is An accessory (not shown) of a conventional disc reproducing device set to 2.8 V and a device whose minimum operation guarantee voltage sold as an option is set to 2.7 V (hereinafter referred to as an earphone unit 2b). ) Is used interchangeably. Note that the earphone unit 2
a and 2b have the same configuration except that the minimum operation guarantee voltage is different.

As shown in FIG. 1, the disc reproducing apparatus 1 includes an apparatus main body 3 having a substantially bottomed box-shaped casing 3a and a substantially bottomed box-shaped lid 3b for opening and closing the casing 3a. It is configured with. The apparatus main body 3 is provided with a socket 4 to which the earphone unit 2 can be connected on one side thereof.

As shown in FIG. 1, the earphone unit 2 includes a connection plug 5 inserted into and removed from a socket 4 provided in the disc reproducing apparatus 1, an earphone 6 serving as an electro-acoustic converter, and the connection plug 5 and the earphone. An earphone cord 7 having both ends 6 connected to each other, and a remote controller 8 provided in the middle of the earphone cord 7.

The earphone 6 is configured such that unit parts 6a and 6b for both left and right ears are provided at one end of an earphone cord 7 which is divided into two branches. The earphone 6 transmits and receives an audio signal to and from the disc reproducing device 1 via the earphone cord 7. Although not shown, the unit sections 6a and 6b are provided with a diaphragm, a voice coil attached to the diaphragm, a magnetic circuit for moving the voice coil, and the like. Convert.

The remote controller 8 has a liquid crystal display 9
An operation button 10 for selecting an operation mode of the disc reproducing apparatus 1 and a volume knob 1 for adjusting a level of an audio signal.
1 is provided. The remote controller 8
An operation control signal output from the remote controller 8 and an acoustic signal output from the disk reproducing device are exchanged with the disk reproducing device 1 via the earphone cord 7. The liquid crystal display unit 8 displays, on the remote controller 8, the operating state of the disk in the disk reproducing apparatus 1, the number of the music being reproduced, and the like. The operation buttons 10 are provided on the remote controller 8 in plurals, for example, a play button, a rewind button, a fast forward button, a stop button, and the like. Each operation button 10 is arranged on a remote control circuit board (not shown). Each operation button 10
When pressed, the diaphragm switch provided on the remote control circuit board is pressed,
An operation control signal corresponding to each operation button 10 is transmitted to the disc reproducing device 1.

As shown in FIG. 2, the disk reproducing apparatus 1 supplies a drive voltage from a power supply unit 12 to the remote controller 8 of the earphone unit 2 via each unit in the disk reproducing apparatus 1 and the earphone cord 7. Also, in the disc reproducing apparatus 1, the system control unit 13 which is supplied with the driving voltage drives the optical disc, reads the recorded information and the like, and operates the mechanism operating unit 14 and displays the information recorded on the optical disc. The operation of the unit 15 and the like is controlled to control the overall operation of the disc reproducing apparatus 1. As shown in FIG. 2, the operation of the liquid crystal display unit 9 of the remote controller 8 of the earphone unit 2 is controlled by the liquid crystal display control unit 16 that receives the supply of the driving voltage from the power supply unit 12 of the disk reproducing device 1.

When the power switch of the disc reproducing apparatus 1 is turned on, the power supply section 12 sends the information to the system control section 13, the display section 14 and other components of the disc reproducing apparatus 1 and the liquid crystal display control section 16 of the earphone unit 2. Supply drive voltage. In addition, the power supply unit 12 changes the power supply voltage according to the frequency transmitted from the system control unit 13 and supplies the power supply voltage.
In addition, immediately after the power switch is turned on, the power supply unit 12 supplies a preset power supply voltage of 2.6 V to the disk reproducing apparatus 1. The specification of the minimum operation guarantee voltage is 2.7 V. When a certain earphone unit 2b is connected, the liquid crystal display unit 9 of the earphone unit 2b does not operate. For this reason, the power supply unit 12
Regardless of which of the earphone units 2a and 2b is connected to the disc reproducing device 1, the voltage is a voltage at which both the earphone units 2a and 2b operate and the power supply voltage set for the disc reproducing device 1. A higher voltage, for example, 2.8 V is supplied as the initial drive voltage.

When the drive voltage is supplied from the power supply section 12, the system control section 13 sends the above-described sound signal to the liquid crystal display control section 16 of the earphone unit 2 via the earphone cord 7 together with the sound signal described above. And information signals such as the operation number of the music and the music number. The liquid crystal display control section 16 drives the liquid crystal display section 9 based on this information signal, and causes the liquid crystal display section 9 of the remote controller 8 to display the state of the disc, the number of the music being reproduced, and the like.

When the drive voltage is supplied from the power supply unit 12, the liquid crystal display control unit 16 sends the minimum operation guarantee voltage of the earphone unit 2 to the system control unit 13 of the disc reproducing apparatus 1 via the earphone cord 7. Is transmitted. That is, the liquid crystal display control unit 16 determines that the earphone unit 2 connected to the disc player 1
The earphone unit 2a whose minimum operation guarantee voltage is 2.6V or less, or the minimum operation guarantee voltage is 2.7V
An identification signal for identifying the earphone unit 2b is transmitted to the system control unit 13. System control unit 13
Receives this identification signal and identifies the voltage specification of the minimum operation guarantee voltage of the earphone unit 2. System control unit 1
3 resets the power supply voltage of the disk reproducing apparatus 1 based on the identification result, and transmits a frequency corresponding to the reset power supply voltage to the power supply unit 12. Power supply unit 12
Changes the drive voltage supplied to each unit of the disk reproducing apparatus 1 and the earphone unit 2 according to the transmitted frequency.

Next, a method of supplying a drive voltage from the disk reproducing apparatus 1 having the above-described structure to the earphone unit 2 connected to the disk reproducing apparatus 1 will be described with reference to FIG. When the power switch is turned on in step 1 of FIG.
Each part of the disc reproducing apparatus 1 such as the power supply unit 12 to the system control unit 13 and the liquid crystal display control unit 1 of the earphone unit 2
6 is supplied with an initial drive voltage for driving it.
At this time, as described above, the power supply unit 12 operates so that either one of the earphone units 2 can operate, and the minimum operation guarantee voltage 2.7 of the earphone unit 2b having the higher minimum operation guarantee voltage.
A driving voltage of V or more, for example, a driving voltage of 2.8 V is supplied as an initial driving voltage.

When the initial drive voltage is supplied from the power supply unit 12 to the liquid crystal display control unit 16 in step 2, the earphone unit 2 sends the minimum operation of the earphone unit 2 to the system control unit 13 of the disc reproducing apparatus 1. An identification signal for the voltage specification of the guaranteed voltage is transmitted.

In step 3, the system control unit 13 receives the identification signal about the voltage specification of the earphone unit 2 transmitted from the liquid crystal display control unit 16. In step 4, the system control unit 13 determines that the earphone unit 2 connected based on the received identification signal has a low minimum operation guarantee voltage, that is, the earphone unit 2a of the LOW specification, or the minimum operation guarantee voltage is high, It identifies whether the earphone unit 2b is of the HIGH specification. When the system control unit 13 identifies the earphone unit 2 a of the LOW specification, the system control unit 13 sends a LOW output to the power supply unit 12. When the system control unit 13 identifies the earphone unit 2b of the HIGH specification, the system control unit 13 sends the
Send H output. The power supply unit 12 includes a system control unit 13
And supplies the corresponding drive voltage to each unit of the disc reproducing apparatus 1 and the liquid crystal display control unit 16 of the earphone unit 2. That is, the power supply unit 12
When the OW frequency is received, in step 5, the drive voltage is changed and supplied to the earphone unit 2a to 2.6V lower than the initial drive voltage. The power supply unit 12
Receives the HIGH frequency, and in step 6, the disc reproducing apparatus 1
Is supplied at a drive voltage of 2.8 V which is still higher than the set power supply voltage.

In the disk reproducing apparatus 1, in step 7, the power switch is monitored for the off state, and the operation loop of steps 1 to 6 described above is maintained while the power switch is maintained in the on state.

In addition, the disc reproducing apparatus 1 executes step 7
In, when the off state of the power switch is detected, the transition to the off state is performed.

In the present embodiment, the main device has been described as the portable disk reproducing apparatus 1. However, the present invention is not limited to this embodiment, and is driven by receiving a voltage supply from the power supply unit 12. It goes without saying that the present invention is applied to various types of connection devices.

In the present embodiment, the main unit is the disk reproducing apparatus 1 and the connected apparatus is the liquid crystal display 9.
Has been described as an earphone unit 2 with a remote controller, but is not limited thereto, and various system devices configured such that connected devices having no self-power supply are driven by being supplied with voltage from the main device. Of course. .

Furthermore, the driving voltage supply method according to the present invention cannot be implemented only between new and old models of the same kind of equipment as in the present embodiment, and the specification of the connected equipment between the main equipment and the connected equipment is not limited. If the format of a line for transmitting and receiving an identification signal for identifying a disc is matched, it can be used between different types of equipment, for example, a disk drive and a digital audio tape (D
AT) The present invention can also be implemented between players.

[0029]

According to the driving voltage supply method of the present invention, a predetermined driving voltage is supplied from the main device to the connected device in accordance with the voltage specification of the connected device connected to the main device. This eliminates the need for confirmation of specifications, switching operation, and the like, and enables use of connected devices having different voltage specifications regardless of the voltage specifications of the main device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a disk reproducing apparatus and an earphone unit shown as an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a power supply unit in the disk reproducing device and the earphone unit.

FIG. 3 is a flowchart illustrating an operation of supplying a predetermined drive voltage from a disk reproducing device to an earphone unit.

[Explanation of symbols]

1 disc playback device (main device), 2 earphone unit (connection device), 8 remote controller, 9 liquid crystal display unit, 12 power supply unit, 13 system control unit, 16 liquid crystal display control unit

Claims (1)

[Claims] 1. A method of supplying a drive voltage between a main device and a connected device connected to the main device and receiving a voltage supply, the method comprising the steps of: Supplying an initial drive voltage to the main device, transmitting voltage specification information from the connection device to the main device based on the supply of the initial drive voltage, and receiving the voltage specification information. The minimum operation guarantee voltage of the connected device is determined, and a predetermined drive voltage is supplied from the main device to the connected device based on the determination of the minimum operation guarantee voltage, so that the voltage specification differs from the main device. A driving voltage supply method for supplying a predetermined driving voltage to the connection device.