JPH0511603U - Cordless phone - Google Patents

Abstract

(57) [Summary] (Modified) [Construction] A green, orange, and red light-emitting diode 10 for displaying the remaining charge of the regular battery, which is provided with a regular battery and a spare battery in the housing of the cordless telephone. , 11, 12 and a regular / preliminary switching electric key 4 for switching the regular battery to the spare battery. When the red light-emitting diode for battery charge remaining indicator flashes, operate the regular / preliminary switching key to switch the regular battery to the spare battery. [Effect] The call is not disconnected even if you start the call by forgetting to charge the battery when the battery charge is low.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cordless telephone, and more particularly to a cordless telephone having a spare battery built in a housing.

[0002]

[Problems to be solved by conventional techniques and devices]

 As shown in FIG. 5, the conventional cordless telephone 21 is provided as a slave unit of the main telephone 28 connected to the central line, and the cordless telephones 21 mutually and the main telephone 28 and the cordless telephone 21 mutually. The extension telephone call and the telephone call from the cordless telephone 21 via the main telephone 28 can be made.

The cordless telephone 21 has a green light emitting diode 22 for displaying the remaining battery charge, an orange light emitting diode 23 for displaying the remaining battery charge, and a red light emitting diode 24 for displaying the remaining battery charge. It is provided and displays the remaining battery charge of 51% to 100%, 26% to 50%, and 0% to 25%, respectively. A guideline for continuous communication with the cordless telephone 21 having the above-mentioned configuration is, for example, 4 to 6 hours while the battery charge remaining amount display green light emitting diode 22 is lit, and the orange light emitting diode 23 for battery charge remaining amount display. Indicates that the call may be interrupted when the red light-emitting diode 24 for indicating the remaining battery charge is blinking while is on. However, if you forget to charge the battery when the battery charge is low and you start the call, the call will be disconnected.

[0004]

[The purpose of the device]

 The present invention has been made in view of the above-mentioned problems, and a light-emitting diode for displaying a remaining charge is provided in which a normal battery and a spare battery are provided in the casing of a cordless telephone, and which displays the remaining charge of the normal battery. Provide a cordless phone that does not disconnect the call even if you start a call by forgetting to charge the battery when the remaining battery charge is low, by providing a service key that switches the service battery to the standby battery and a standby switch key. The purpose is to

[0005]

[Means for Solving the Problems]

 The present invention is a light-emitting diode for a charge remaining amount display that displays a service battery connected to a load in the casing of a cordless telephone, a spare battery provided in the casing, and a charge remaining amount of the service battery. And a regular / preliminary switching key for switching the regular battery connected to the load to the spare battery.

[0006]

[Action]

 A cordless phone is equipped with a service battery and a spare battery inside the case, and a green, orange, and red light-emitting diode for displaying the remaining charge of the service battery and a service battery that switches the service battery to a spare battery , And a spare switching key. When the red light emitting diode for remaining battery charge display flashes, operate the service / reserve switching key to switch the service battery to the reserve battery.

[0007]

【Example】

 An embodiment of the cordless telephone according to the present invention will be described in detail below with reference to FIGS. As shown in FIG. 1, the cordless telephone according to the present invention has a green light-emitting diode 10 for the remaining charge of the normal battery, an orange light-emitting diode 11 for the remaining charge of the normal battery, a red light-emitting diode 12 for the remaining charge of the normal battery, and an indicator indicating that the spare battery is in use. The light emitting diode 9 and the normal / preliminary switchover key 4 are surface-mounted together with the ten-key pad 17. Further, the service battery 2 and the spare battery 3 are housed in a housing as shown in FIG.

The service battery 2 has a charging capacity of about 130 hours for standby and about 6 hours for continuous communication. The reserve battery 3 has a charge capacity of about 15% that of the regular battery 2. Two or three cordless telephones 1 are provided with respect to the main telephone 28 shown in FIG. You can call.

As shown in FIG. 3, the cordless telephone 1 includes a service battery 2, a backup battery 3, a service spare switching contacts 5 and 6, a service battery contact 7, a signal contact 8, and a service switching key 4, A / D. A charge remaining amount measuring circuit 13 including a conversion circuit 14 and a CPU 15, the above-mentioned normal battery charge remaining amount green light emitting diode 10, a common battery charge remaining amount orange light emitting diode 11, a common battery charge remaining amount red light emitting diode 12, a spare battery used The load circuit 16 includes a middle display light emitting diode 9 and a ten-key pad 17.

The output side of the charger 18 is connected to the service battery 2 and the backup battery 3 via terminals T ₁ and T ₂ as shown in FIG. 3, and the load side of the service battery 2 and the backup battery 3 is used for the service. Preliminary changeover The load circuit 16 and the input side of the A / D conversion circuit 14 of the charge remaining amount measuring circuit 13 are connected via the usual preliminary changeover contacts 5 and 6 of the electric key 4. The other end of the signal contact 8 whose one end is connected to the terminals T ₁ and T ₂ is connected to the CPU 15 of the charge remaining amount measuring circuit 13, and the control output side of the CPU 15 is the normal battery charge remaining amount green light emitting diode 10. It is connected to the orange light emitting diode 11 of the remaining charge of the service battery and the red light emitting diode 12 of the remaining charge of the service battery. Further, the other end of the spare battery contact 7 having one end connected to the spare battery 3 is connected to the spare battery in-use display light emitting diode 9.

A circuit diagram corresponding to the block diagram shown in FIG. 3 is shown in FIG. When the cordless telephone 1 is placed on the charger 18, the output side of the charger 18 is connected to the terminals T ₁ and T ₂ as shown in FIG. The terminal T ₂ is connected to the (−) side which is the reference potential point of the service battery 2 and the spare battery 3, and the terminal T ₁ is connected to the service battery 2 via the backflow prevention diodes D ₁ and D ₂ through the anode and cathode. Is connected to the (+) side of the spare battery 3. Further, the normal and auxiliary switching contacts 4 and the normal closing contacts of the auxiliary switching contacts 5 and 6 are connected to the (+) side and the (-) side of the normal battery 2, respectively, and the respective movable contacts are connected to the load circuit 16 and the remaining charge. It is connected to the input side of the A / D conversion circuit 14 of the quantity measuring circuit 13. Further, the output side of the A / D conversion circuit 14 is connected to the input side of the CPU 15, and the control output side of the CPU 15 is connected via the resistors R ₂ , R ₃ and R ₄ to the normal battery charge remaining amount green light emitting diode 10 and the normal side. The battery remaining charge orange light-emitting diode 11 and the normal battery remaining charge red light-emitting diode 12 are connected to the anodes, and the respective cathodes are connected to the movable auxiliary switching contacts 6. The normally open contact of the normal / preliminary switching contact 6 is connected to the terminal T _2, and the normally open contact of the normal / preliminary switching contact 5 is connected to the anode of the standby battery in-use display light emitting diode 9 through the resistor R _1. It Also, the cathode of the light emitting diode 9 for indicating the use of the spare battery is connected to the terminal T ₂ through the contact 7 of the spare battery. Further, one end of the other end of the resistor connected R ₅ to the terminal T ₁ is connected to the CPU15 of the signal input side, further, the terminal T ₂ this resistor the other end of the anti-R ₅ via a normally open signal contact 8 Connected with.

When the charger 18 shown in FIG. 4 is connected to the terminals T ₁ and T ₂ in the cordless telephone 1 having the above structure, the service battery 2 and the spare battery 3 are charged via the diodes D ₁ and D ₂ . At this time, the control signal line to the CPU 5 goes to the H level via the terminal T ₁ and the resistor R ₅ , so that the normal battery charge remaining amount red light emitting diode 12, the normal battery charge remaining amount orange light emitting diode 11, depending on the charge capacity, Remaining battery charge Remaining green LEDs light up one after another. When the charger 18 is detached from the terminals T ₁ and T ₂ and placed in a standby state or in a call state, the red light emitting diode 12 of the remaining charge of the service battery flashes just before the charge capacity is completely exhausted. When the normal / preliminary switching electric key 4 is operated while seeing this blinking, the normal / preliminary switching contacts 5 and 6 are operated, and the spare battery contact 7 and the signal contact 8 are closed. When the signal contact 8 is closed, the signal control line of the CPU 15 is connected to the reference potential point and becomes L level, and the power source is connected to the load circuit 16 from the spare battery 3 and the power source via the resistor R ₁ is used for backup. The light emitting diode 9 for indicating that the battery is in use lights up.

Although a cordless telephone has been described in the above embodiment, it may be applied to a wireless device using a rechargeable battery of another MCA (multi channel access) system or the like.

[0014]

[Effect of the device]

 The cordless telephone according to the present invention comprises a service battery connected to a load in the housing, a spare battery provided in the housing, and a light emitting diode for displaying the remaining charge of the service battery. Also, it has a regular and spare switching key that switches the regular battery connected to the load to a spare battery, so the call is not disconnected even if you start a call by forgetting to charge it when the battery charge is low. There is.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cordless telephone according to the present invention.

FIG. 2 is a rear perspective view of the cordless telephone shown in FIG. 1 according to the present invention.

3 is a block diagram of the cordless telephone shown in FIG. 1 according to the present invention.

FIG. 4 is a circuit diagram of the cordless telephone shown in FIG. 1 according to the present invention.

FIG. 5 is a perspective view of a conventional cordless telephone.

[Explanation of symbols]

2 ・ ・ Common battery 3 ・ ・ ・ ・ ・ ・ Spare battery 4 ・ ・ ・ ・ ・ ・ Common / spare switching key 9 ・ ・ ・ ・ ・ ・ Light-emitting diode for display of spare battery in use 10 ・ ・··················································································································································· Light-emitting diode for display) 12 ... Red light-emitting diode for displaying remaining battery charge (light-emitting diode for displaying remaining charge)

Claims (1)

Claims for utility model registration: Claims: 1. A cordless telephone capable of wirelessly communicating with a main telephone connected to an office line, and a service battery connected to a load in the housing of the cordless telephone. A spare battery provided in the housing, a charge remaining amount display light-emitting diode that displays the charge remaining amount of the service battery, and a service battery that switches the service battery connected to the load to the service battery. A cordless telephone having a switching key.