JP3091669B2 - Cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a cordless telephone has been provided with an incoming / charging indicator for notifying a slave unit of the presence / absence of an incoming call and for notifying the charging status of a charger. At the time of an incoming call of an extension, the incoming call is notified by blinking at a predetermined interval, and the charging status is notified by lighting up in a charging state in which the slave unit is placed on the charger.

[0003]

However, in the above-mentioned conventional device, since the power source for driving the incoming / charging indicator is a secondary battery built in the slave unit, the voltage capable of driving the incoming / charging indicator is large. When the slave is placed on the charger when the secondary battery is not charged, the incoming / charge indicator of the slave does not light, and the user cannot confirm whether or not charging is being performed. In addition, there is a problem that the user erroneously recognizes that some trouble has occurred.

[0004] It is an object of the present invention to provide a cordless telephone capable of reliably informing a charging status on a display unit even when the charging voltage of a built-in secondary battery is reduced.

[0005]

To achieve the above object, according to the present invention, there is provided a base unit connected to a telephone line, and a child unit capable of making a call by being wirelessly connected to the base unit. And a charger for charging a secondary battery incorporated in the slave, and a cordless telephone having a display for notifying the charging status of the charger on the slave, A first power supply unit using a charging voltage of a built-in secondary battery, a second power supply unit using a supply voltage supplied from the charger, and a voltage detecting unit for detecting a charging voltage of the built-in secondary battery And a power supply switching means for selectively switching the first power supply section or the second power supply section as a power supply for driving the display section based on a detection result by the voltage detection means, wherein the display section comprises: To select the second power supply When it is replaced, it is an always informing state.

According to a second aspect of the present invention, there is provided a first brightness adjustment section for adjusting brightness of the display section by controlling a power supply voltage supplied from the first power supply section to the slave unit; A second brightness adjustment unit for adjusting the brightness of the display unit by controlling a power supply voltage supplied from a power supply unit, wherein the power supply switching unit is configured to control the first brightness based on a detection result by the voltage detection unit. By selectively switching the adjustment unit or the second brightness adjustment unit, the first power supply unit or the second
The selection of the power supply unit is switched.

According to a third aspect of the present invention, in the power supply apparatus, the second brightness adjustment unit may be configured to supply power from the second power supply unit so as to be different from the brightness of the display unit adjusted by the first brightness adjustment unit. It controls the voltage.

[0008]

Therefore, according to the first aspect of the present invention, when a slave unit in a state where the charging voltage of the built-in secondary battery is not lowered is placed on the charger, the voltage detecting means causes the charging of the built-in secondary battery to be performed. The power supply switching means supplies the power supply voltage of the first power supply unit to the display unit based on the detection result based on the detection result, while the charging voltage of the built-in secondary battery is reduced. When a certain handset is placed on the charger, the voltage detecting means detects that the charging voltage of the built-in secondary battery is in a low state, and the power supply switching means changes the power supply voltage of the second power supply unit based on the detection result. By supplying the battery to the display unit, when charging is performed by placing the slave unit on the charger, the charging status of the built-in secondary battery can be notified by the display unit.

According to the second aspect of the present invention, when the slave unit in which the charging voltage of the built-in secondary battery is not lowered is placed on the charger, the voltage detecting means causes the charging voltage of the built-in secondary battery to be reduced. The high power state is detected, and based on the detection result, the power supply switching means supplies the power supply voltage from the first power supply section adjusted by the first brightness adjustment section to the display section while charging the built-in secondary battery. When the slave unit in a state where the voltage is lowered is placed on the charger, the voltage detecting means detects that the charging voltage of the built-in secondary battery is in a low state, and the power supply switching means based on the detection result. By supplying the power supply voltage from the second power supply unit adjusted by the second brightness adjustment unit to the display unit, the display unit can notify the charging status of the built-in secondary battery.

According to the third aspect of the present invention, when a child device in a state where the charging voltage of the built-in secondary battery has not been lowered is placed on the charger, the luminance adjusted by the first luminance adjusting unit is used. When the display unit gives a notification and the slave unit in a state where the charging voltage of the built-in secondary battery is lowered is placed on the charger, the brightness of the first brightness adjustment unit adjusted by the second brightness adjustment unit is Since the display unit performs notification using different luminances, the state of the charging voltage of the built-in secondary battery can be reported based on the luminance of the display unit.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic functional block diagram showing an electrical configuration of a main part of a cordless telephone handset according to an embodiment of the present invention. FIG. 2 is a flowchart showing a charging / incoming notification operation in the cordless telephone handset. is there.

In FIG. 1, reference numeral 1 denotes a charging circuit that generates a predetermined voltage and current based on a charging voltage supplied from a charger (not shown), 2 denotes a charging control unit that controls a charging current generated by the charging circuit 1, Reference numeral 3 denotes a secondary battery that is charged by the charging current controlled by the charging control unit 2, and 4 denotes a charging detection unit that detects a charging state by a charger (not shown) based on the control of the charging current by the charging control unit 2.

Reference numeral 5 denotes a first brightness adjustment unit for controlling a power supply voltage generated by the secondary battery 3, 6 denotes a second brightness adjustment unit for controlling a charging voltage generated by the charging circuit 1, and 7 denotes a first brightness adjustment unit 5. Alternatively, a power supply switching unit that selectively switches the second luminance adjustment unit 6 is an indicator that is driven by a supply voltage from the first luminance adjustment unit 5 or the second luminance adjustment unit 6 that is selectively switched by the power supply switching unit 7. .

Reference numeral 9 denotes an incoming call detection unit for detecting an incoming call of an outside line / extension based on an incoming signal transmitted from a base unit (not shown);
Reference numeral 10 denotes a reset generation unit that generates a reset signal in response to a voltage drop of the secondary battery 3. Reference numeral 11 denotes a detection signal from the charge detection unit 4, a detection signal from the incoming call detection unit 9, and a reset from the reset generation unit 10. The main control unit controls the first brightness adjustment unit 5, the power supply switching unit 7, and the indicator 8 based on the signal.

Regarding the charging / incoming call notification of the slave unit configured as described above, a case where the charging voltage of the secondary battery 3 is sufficiently high will be described first.

When the charging voltage of the secondary battery 3 is sufficiently high, the generation of the reset signal by the reset generation unit 10 is released, and the release of the reset signal causes the control unit 11 to operate and the operated main control unit 11 to operate. The reset release is detected (step F1), and accordingly, the main control unit 11 controls the power supply switching unit 7 to supply the voltage to the indicator 8 from the secondary battery 3 whose voltage has been adjusted by the first brightness adjustment unit 5. Selectively switch power supply voltage (step F
2).

In a state in which the power supply voltage from the secondary battery 3 whose voltage has been adjusted by the first brightness adjusting unit 5 is supplied to the indicator 8, an incoming signal is transmitted from the master unit, and the incoming signal is detected. When the incoming call detecting unit 10 detects an incoming call of an outside line / extension (step F3), the main control unit 11 outputs an indicator output based on the detection result.
By repeating L "and" H "(step F4), the indicator 8 blinks.

In a state where the power supply voltage from the secondary battery 3 whose voltage has been adjusted by the first luminance adjusting unit 5 is supplied to the indicator 8, when the slave unit is placed on the charger, the charger is charged. The charging circuit 1 generates a voltage and a current based on the charging voltage supplied in accordance with the mounting on the secondary battery, and the charging control unit 2 controls the charging current from the charging circuit 1 to charge the secondary battery 3. On the other hand, the charging detection unit 4 detects that charging is being performed based on the charging current control (step F5), and the main control unit 11 sets the indicator output to “L” based on the detection result. (Step F
6) The indicator 8 is turned on.

When the incoming / outgoing line is detected by the incoming call detecting section 10 in the lighting state of the indicator 8 (step F3), the main control section 11 performs "L" and "H" by the same operation control as described above. Is generated (step F4), and the incoming call is notified with the indicator 8 blinking.

Therefore, according to the above operation control, when the charging voltage of the secondary battery 3 built in the slave unit is sufficiently high, the charging voltage of the built-in secondary battery 3 is supplied to the indicator 8. When charging of the secondary battery 3 performed in accordance with the placement of the slave unit in the charger is detected, the charging is notified by turning on the indicator 8, and the state of placement in the charger and non-mounting of the battery. When an incoming call is detected in the
The incoming call can be notified by blinking the indicator 8.

Next, the charging / incoming call notification of the slave unit when the charging voltage of the secondary battery 3 is lowered will be described.

When the charging voltage of the secondary battery 3 decreases, a reset signal is generated by the reset generator 10, and when the reset signal is detected by the main controller 11 (step F1), the main controller 11 switches the power supply. The power supply voltage from the charging circuit 1 whose voltage has been adjusted by the second luminance adjustment unit 6 is selectively switched as the voltage supplied to the indicator 8 by controlling the unit 7 (step F7), and the indicator output is set to "L" (step F7). By the step F8), when the slave unit is mounted on the charger, the charging control unit 2 outputs the current generated from the charging circuit 1 based on the charging voltage supplied in accordance with the mounting on the charger. While the secondary battery 3 is charged by the control, the charging voltage from the charging circuit 1 is adjusted by the second brightness adjusting unit 6 so that the power supply voltage is generated. To turn on the indicator 8.

It is to be noted that the first luminance adjusting unit 6 is driven by the first luminance adjusting unit 5 such that the luminance of the indicator 8 is different from the luminance of the indicator 8 which is driven by the power supply voltage adjusted by the first luminance adjusting unit 5. In a state where the voltage of the luminance adjustment unit 5 and the second luminance adjustment unit 6 is adjusted, and the indicator 8 is driven by the power supply voltage adjusted by the second luminance adjustment unit 6, the charging voltage of the secondary battery 3 is changed. Rises, and when the reset generation by the reset generation unit 10 is canceled, the power supply voltage adjusted by the first luminance adjustment unit 5 is supplied as the power supply voltage of the indicator 8 by the above operation control.

Therefore, according to the above operation control, when the main control unit 11 cannot be operated due to a decrease in the charging voltage of the secondary battery 3 built in the slave unit, the charging circuit 1 generated by power supply from a charger (not shown). Is supplied to the indicator 8 and the indicator 8 is constantly turned on. Therefore, when the secondary battery 3 is charged in accordance with the placement of the slave unit on the charger, the indicator 8 is turned on. The indicator 8 is turned on when the power supply of the
Charging notification can be performed by turning on the indicator 8.

[0026]

As described above, according to the first or second aspect of the present invention, when the charge voltage of the built-in secondary battery is high, the charge voltage of the built-in secondary battery is used as the power source of the display unit. On the other hand, when the charging voltage of the built-in secondary battery decreases, the supply voltage of the charging circuit is used as the power supply of the display unit, and the display unit is always in the notification state,
When the slave unit is placed on the charger to charge the built-in secondary battery, regardless of the level of the charging voltage of the built-in secondary battery, the charge notification can be performed by the display unit. It is possible to reliably recognize whether or not the built-in secondary battery is being charged, and prevent erroneous recognition by the user.

According to the third aspect of the present invention, the brightness of the display unit when the charging voltage of the built-in secondary battery is high is different from the brightness of the display unit when the charging voltage of the built-in secondary battery is low. When charging the built-in secondary battery, the user can recognize whether the charging voltage of the built-in secondary battery is high or the charging voltage of the built-in secondary battery is low. Whether it is possible or not can be quickly and accurately recognized.

[Brief description of the drawings]

FIG. 1 is a schematic functional block diagram showing an electrical configuration of a main part of a cordless telephone handset according to an embodiment of the present invention.

FIG. 2 is a flowchart showing operation control of charging / incoming call notification in the cordless telephone handset.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 charging circuit 2 charge control unit 3 secondary battery 4 charge detection unit 5 first brightness adjustment unit 6 second brightness adjustment unit 7 power supply switching unit 8 indicator 9 incoming detection unit 10 reset generation unit 11 main control unit

Claims (3)

(57) [Claims] 1. A master unit connected to a telephone line, a slave unit capable of communicating by being wirelessly connected to the master unit, and a charger for charging a secondary battery built in the slave unit. On the other hand, a cordless telephone provided with a display unit for notifying the charging status of the charger in the slave unit, wherein the slave unit includes a first power supply unit using a charging voltage of a built-in secondary battery; A second power supply unit using a supply voltage supplied from a charger, voltage detection means for detecting a charging voltage of the built-in secondary battery, and a power supply for driving the display unit based on a detection result by the voltage detection means Power supply switching means for selectively switching the first power supply unit or the second power supply unit, wherein the display unit is always in a notification state when the second power supply unit is selected and switched by the power supply switching unit. Code characterized by Scan the phone. 2. A first brightness adjustment unit for adjusting the brightness of the display unit by controlling a power supply voltage supplied from the first power supply unit to the slave unit, and supplied from the second power supply unit. A second brightness adjustment unit that adjusts the brightness of the display unit by controlling a power supply voltage, wherein the power supply switching unit is configured to control the first brightness adjustment unit or the second brightness based on a detection result by the voltage detection unit. 2. The cordless telephone according to claim 1, wherein the first power supply unit or the second power supply unit is selectively switched by selectively switching an adjustment unit. 3. The second brightness adjustment unit controls a power supply voltage supplied from the second power supply unit so as to be different from the brightness of the display unit adjusted by the first brightness adjustment unit. The cordless telephone according to claim 2, wherein: