JPH10225000A - Charger for cordless telephone and child telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intensify the contact between each charging terminal of a child telephone and each supply-side charging terminal, and to evade the mischarging of a battery contained in the child telephone by inserting the coils of electromagnets into a charging current route reaching the supply-side charging terminals, magnetizing them by the charging current and intensifying the mutual contact between the charging terminals. SOLUTION: When a child telephone is set in a charging stand, child telephone side charging terminals 8, 9 come into contact with supply-side charging terminals 4, 5 respectively, a parent telephone charging circuit C1 and a child telephone charging circuit C2 are connected, and a current circuit to a self-contained battery 26 is formed, and charging is started. At this time, a supply current flowing in current routes L1, L2 flows in electromagnets 21, 22 also, so the electromagnets 21, 22 are magnetized. And the supply-side charging terminals 4, 5 touching these are magnetized, and attract the child telephone side charging terminals 8, 9. Consequently, the contact between each charging terminal of the child telephone and each charging terminal of the charging stand is intensified, and it becomes possible to evade the mischarging of the battery contained in the child telephone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for a cordless telephone and an improvement in contactability of a charging terminal of a slave unit.

[0002]

2. Description of the Related Art A cordless telephone is charged by mounting a slave unit on a charging stand of a base unit or a charger and contacting a charging terminal of the slave unit and a charging terminal of the charging stand. In other words, in the charging device of the cordless telephone, the supply side charging terminal facing the slave side charging terminal is exposed and provided on the charging stand on which the slave unit is mounted, so that the slave unit is built-in through the charging terminal facing the slave unit. Battery can be charged.

For this reason, when charging the cordless handset, the cordless telephone user only has to perform the operation of mounting the cordless handset on the charging stand of the base unit or the charger.

[0004]

However, in the above-mentioned conventional cordless telephone charging apparatus, by mounting the slave unit on the charging stand, the charging terminal of the slave unit is brought into contact with the charging terminal of the charging stand to perform charging. For this reason, poor contact between the charging terminal of the slave unit and the charging terminal of the charging stand is likely to occur when the slave unit is mounted inclined in the charging stand. For this reason, there is a problem that charging failure occurs in the battery built in the slave unit. To solve this problem, a mechanism such as locking the slave unit in the charging stand is conceivable, but in this case, there is a problem that the device becomes complicated.

In view of the above, the present invention has been made in view of the above problems, and enhances the contact between the charging terminal of the slave unit and the charging terminal on the supply side, thereby avoiding the occurrence of poor charging in the battery incorporated in the slave unit. The purpose is to:

[0006]

In order to solve the above-mentioned problems, the present invention provides a charging stand on which a slave unit is mounted, wherein a supply-side charging terminal opposed to the slave-side charging terminal is provided to be exposed. A charging device for a cordless telephone that charges a built-in battery through an opposite charging terminal when the device is mounted, wherein an electromagnet is provided near the supply-side charging terminal, and a coil of the electromagnet reaches the supply-side charging terminal. It is inserted into the charging current path and is magnetized by the charging current to enhance the contact between the charging terminals.

[0007] When the cordless telephone handset is mounted on the charging stand of the base unit or the charger, charging from the charging stand to the battery built in the handset starts, and an electromagnet provided near the charging terminal of the charging stand. Are magnetized by the charging current. When the electromagnet is magnetized, the charging terminal of the slave unit is magnetically attracted to the charging terminal side of the charging stand. Thereby, the contact between the charging terminal of the child device and the charging terminal of the charging stand is strengthened, and the battery built in the child device is reliably charged.

Further, the present invention charges a built-in battery by mounting a slave unit side charging terminal mounted on a charging stand of a base unit or a charger and exposed to the charging stand. An electronic magnet is provided in the vicinity of the charging terminal on the child device side, and a coil of the electromagnet is inserted into a charging current path from the charging terminal on the child device side to the battery, and is magnetized by the charging current. It is characterized in that the contact between the charging terminals is strengthened.

Instead of providing an electromagnet near the charging terminal of the charging stand, an electromagnet is provided near the charging terminal of the slave unit, and the coil of the electromagnet is inserted in the charging current path leading to the built-in battery. When the charging current flows, the charging terminal of the slave unit and the charging terminal on the supply side are attracted, and the same effects as those of the invention can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic perspective view of a cordless telephone charging apparatus according to one embodiment of the present invention.
In the figure, reference numeral 1 denotes a master unit, and 6 denotes a slave unit. A part of the upper surface of the base unit 1 is provided with a charging stand 2 formed in a concave shape, on which the slave unit 6 is mounted. On the wall surface 3 of the charging stand 2 corresponding to the mouthpiece side of the slave unit 6, the charging unit 2 contacts the slave unit-side charging terminals 8 and 9,
Supply-side charging terminals 4 and 5 for supplying a charging current to a built-in battery of the slave unit are provided. The base unit 1 includes a power cord 11, a telephone line 12, and a base unit antenna 18, and the handset 6 includes, in addition, a handset antenna 13, an earpiece 1
4, a display unit 15, a numeric keypad 16, and a mouthpiece 17.

The base unit 1 has a charging circuit connected to the supply-side charging terminals 4 and 5, and the sub-unit 6 has a sub-unit-side charging terminal 8,
There is a charging circuit leading to 9. FIG. 2 is a circuit diagram of a charging unit of the cordless telephone shown in FIG. C1 is a circuit diagram of the charging unit of the master unit, which is connected to the supply side charging terminals 4 and 5,
C2 is a circuit diagram of a charging unit of the slave unit, and a slave-side charging terminal 8,
Leads to 9. The base unit charging circuit C1 includes a constant current circuit unit 23.
And the charge detection unit 24 as a main circuit. The constant current circuit unit 23 includes a plus terminal VDD, a minus terminal GND
And between the supply side charging terminals 4 and 5 to supply a constant current to the slave unit charging circuit C2. The charge detection unit 24 mainly includes a transistor 27 that conducts when the slave unit is set on the charging stand and the supply-side charging terminals 4 and 5 and the slave-unit charging terminals 8 and 9 come into contact and a constant current flows. It consists of a circuit. The coils of the electromagnets 21 and 22 are inserted in the current paths L1 and L2 between the positive and negative output sections 23a and 23b of the constant current circuit section 23 and the supply-side charging terminals 4 and 5, respectively. The slave unit charging circuit C2 includes a built-in battery 26 and a charge detection unit 25. The built-in battery 26 is charged through the child device charging terminals 8, 9 and the current paths L3, L4. The charge detection unit 25 is configured by a voltage dividing circuit between the current paths L3 and L4, and detects that the slave unit is set and is being charged. The other parts of the circuits of the parent device charging circuit C1 and the child device charging circuit C2 are well-known technologies, and thus description thereof is omitted.

FIG. 3 shows a cross-sectional structure near the charging terminal of the charger of the cordless telephone shown in FIG. Electromagnet 21,
Reference numeral 22 denotes an iron core 32 and a coil 33 wound around the iron core 32 with insulation coating incorporated in the case of the parent machine 1 as shown in FIG.

[0013] Iron core 32, coil 33, supply side charging terminal 4
Although (5) is not shown in FIG. 3, a pair of (5) is provided in a direction perpendicular to the paper surface of FIG. 3. Electromagnet 21,
Reference numeral 22 denotes a printed circuit board 34 disposed below the charging stand 2.
And the central axes of the electromagnets 21 and 22 are
4 are arranged in a direction perpendicular to the direction. The lower ends of the electromagnets 21 and 22 are fixed to the lower part of the master unit 1.
The supply-side charging terminal 4 (5) is bent in a crank shape, is exposed from the wall surface 3 of the charging stand 2, and is connected to the slave unit-side charging terminal 8,
9 is composed of a contact terminal portion 31a that contacts the upper surface 9, a horizontal plate portion 31b that is bonded to the upper ends of the electromagnets 21 and 22, and a substrate fixing portion 31c that is fixed to the printed circuit board 34. One end of the coil 33 is connected to the substrate fixing portion 31c of the supply-side charging terminal 4 (5), and the other end is connected to the constant current circuit portion 2 of FIG.
3 output units 23a and 23b.

The constant current circuit section 23 shown in FIG.
A steady current of 0 mA is supplied. Charge the handset 6 to the charging stand 2
The strength of the magnetic field of the electromagnet required to fix the mobile phone varies depending on the weight of the slave unit. Since the strength of the magnetic field is determined by Equation 1, by adjusting the number of turns of the coil 33,
It is possible to obtain a sufficient magnetic field strength for fixing the slave unit 6 to the charging stand 2. [Equation 1] Magnetic field strength H = nI [A / m] In Equation 1, n is the number of turns of the coil per unit length, and I is the current flowing through the coil.

According to the above configuration, when the slave unit 6 is set on the charging stand 2, the slave side charging terminals 8, 9 contact the supply side charging terminals 4, 5, respectively, and the master unit charging circuit C1 The slave unit charging circuit C2 is connected to form a current circuit for the built-in battery 26, and charging is started. At this time, the current paths L1, L
2 flows through the electromagnets 21 and 22, the electromagnets 21 and 22 are magnetized, and the supply-side charging terminals 4 and 5 that contact the electromagnets 21 and 22 are magnetized. Adsorb. Thereby, the contact between the charging terminal of the child device and the charging terminal of the charging stand is strengthened, and it is possible to avoid the occurrence of poor charging of the battery incorporated in the child device.

FIGS. 4 and 5 show a sectional structure of a charger of a cordless telephone in the vicinity of a charging terminal as another embodiment of the present invention. FIG. 4 shows an embodiment in which the electromagnets 21 and 22 are mounted on a printed circuit board in a horizontal direction. Electromagnet 21,
Reference numeral 22 is disposed on the printed circuit board 44 below the charging stand 2 with the central axes of the electromagnets 21 and 22 oriented in the horizontal direction. One ends of the electromagnets 21 and 22 are adhered to the lower end of the supply-side charging terminal 41. According to this configuration, the length of the electromagnets 21 and 22 can be increased and the number of windings of the coil can be increased while keeping the height of the base unit of the cordless telephone constant, as compared with the configuration shown in FIG. Therefore, it is possible to further increase the magnetic force for attracting the slave-side charging terminal.

FIG. 5 shows that when the slave unit 6 is mounted on the master unit 1, one ends of the electromagnets 21 and 22 are connected to the slave side charging terminals 8, 9 respectively.
This is an embodiment in which electromagnets 21 and 22 are mounted in a horizontal direction at a position opposite to the above. The electromagnets 21 and 22 are disposed above a space defined by the outer wall 10 of the base unit 1 and the wall surface 3 of the charging stand 2 with the central axes of the electromagnets 21 and 22 oriented horizontally. One ends of the electromagnets 21 and 22 are exposed from the wall surface 3 of the charging stand 2, and supply-side charging terminals 51 and
It faces the slave unit charging terminal. The other ends of the electromagnets 21 and 22 are fixed to the outer wall 10 of the master unit 1 from the inside. According to this configuration, when the slave unit 6 is mounted on the charging stand 2, one ends of the electromagnets 21 and 22 are closest to the slave unit-side charging terminals 8 and 9 as compared with the embodiment illustrated in FIGS. Thus, a magnetic force can be more reliably exerted.

FIG. 6 shows still another embodiment of the charging device for a cordless telephone according to the present invention. FIG. 6 shows an embodiment of a charging device for a cordless telephone in which the handset 60 is mounted on the charging stand 71 with the earpiece 66 up and the mouthpiece 64 down. A seating surface 72 of the charging stand 71 has a bottom 6
3 contacts with the child device side charging terminals 61, 62 provided in
Supply-side charging terminal 7 that supplies charging current to the internal battery of the slave unit
3, 74 are provided. Electromagnets 75 and 76 are provided near the supply-side charging terminals 73 and 74, and are inserted between the supply-side charging terminals 73 and 74 and the charging circuit of the charger 70.

According to this configuration, due to the own weight of the slave unit 60 and the magnetic force of the electromagnets 75 and 76, the slave side charging terminals 61 and 6 are used.
2 and the supply-side charging terminals 73 and 74 can be more reliably sucked. In addition, instead of providing an electromagnet on the charging stand 2, a structure may be employed in which an electromagnet is provided on the slave unit 6.
Also in this case, it is clear that the same effect as when the electromagnet is provided on the charging stand 2 is obtained. However, in this case,
Since the generated magnetic field affects the transmission / reception circuit of the slave unit 6,
It is necessary to electromagnetically shield the iron core and the coil.

The electromagnet is connected to the supply side charging terminal 4 shown in FIG.
And 5 may be provided on either the supply-side charging terminal 4 or 5.
In this case, by strongly adsorbing one charging terminal, the other charging terminal is also adsorbed, so that the contact between the charging terminal of the slave unit and the charging terminal of the charging stand is strengthened, and the battery built into the slave unit is removed. It is charged reliably.

[0021]

As is apparent from the above, according to the present invention, the charging terminal on which the child device is mounted is provided with the supply-side charging terminal facing the child device-side charging terminal, and is exposed when the child device is mounted. A charging device for a cordless telephone that charges a built-in battery through a charging terminal, wherein an electromagnet is provided in the vicinity of the supply-side charging terminal or in the vicinity of the child-unit charging terminal,
Since the coil of the electromagnet is inserted into the charging current path and magnetized by the charging current to strengthen the contact between the charging terminals, the cordless telephone handset is mounted on the base or the charging stand of the charger. Then, charging from the charging stand to the battery built into the slave unit is started, and the electromagnet is magnetized by the charging current, so that the charging terminal of the slave unit and the charging terminal of the charging stand are magnetically attracted. Therefore, the contact between the charging terminal of the slave unit and the charging terminal of the charging stand is strengthened, and the battery built into the slave unit is reliably charged.

Further, in the case of a cordless telephone having a configuration in which a supply-side charging terminal is provided on a seating surface of a charging base so as to be exposed upward and a charging-side charging terminal is provided at the bottom of the child unit, the charging by the magnetic field lines is difficult. In addition, the contact between the charging terminals is further ensured by the suction of the slave unit by its own weight, which is more preferable. Furthermore, since the electromagnet provided near the charging terminal is not a permanent magnet, it is possible to avoid accidentally adsorbing a metal such as iron.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an embodiment of a charging device for a cordless telephone according to the present invention.

FIG. 2 is a circuit diagram of a charging unit of the cordless telephone shown in FIG.

FIG. 3 is a diagram showing a cross-sectional structure near a charging terminal of a charger of the cordless telephone shown in FIG.

FIG. 4 is a diagram showing a cross-sectional structure near a charging terminal as another embodiment of the charger of the cordless telephone.

FIG. 5 is a diagram showing a cross-sectional structure near a charging terminal of a charger of a cordless telephone as still another embodiment of the present invention.

FIG. 6 is a perspective view of still another embodiment of the charging device for a cordless telephone according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 master unit 2 charging stand 3 wall surface 4 supply side charging terminal 5 supply side charging terminal 6 slave unit 7 end wall 8 slave unit charging terminal 9 slave unit charging terminal 10 outer wall 17 mouthpiece C1 master unit charging circuit C2 child Unit charging circuit L1 Supply-side charging current path L2 Supply-side charging current path L3 Remote unit-side charging current path L4 Remote unit-side charging current path 21 Electromagnet 22 Electromagnet 23 Constant current circuit section 23a Constant current circuit section output section 23b Constant current circuit section Output unit 24 Charge detection unit 25 Charge detection unit 26 Built-in battery 27 Transistor 31a Contact terminal unit 31b Horizontal plate unit 31c Board fixing unit 32 Iron core 33 Coil 34 Printed circuit board 41 Supply-side charging terminal 42 Iron core 43 Coil 44 Printed circuit board 51 Supply Side charging terminal 52 Iron core 53 Coil 54 Printed circuit board 60 Slave unit 61 Slave unit side charging terminal 62 Slave unit side charging terminal 63 Part 64 mouthpiece 66 earpiece 70 charger 71 charging base 72 seating surface 73 supply-side charging terminal 74 supply-side charging terminal 75 electromagnet 76 the electromagnet 79 power cord

Claims (2)

[Claims] 1. A charging stand on which a slave unit is mounted, a supply-side charging terminal facing the slave-side charging terminal is provided so as to be exposed, and a battery built in the slave unit is charged through the charging terminal facing the slave unit when the slave unit is mounted. In the charging device for a cordless telephone, an electromagnet is provided in the vicinity of the supply-side charging terminal, a coil of the electromagnet is inserted into a charging current path leading to the supply-side charging terminal, and magnetized by the charging current to connect the charging terminals to each other. A charging device for a cordless telephone, wherein the charging device is configured to enhance contact. 2. Mounted on a charging stand of a base unit or a charger,
In the cordless handset of the cordless telephone which is configured to charge the built-in battery by bringing the cordless terminal side charging terminal into contact with the supply side charging terminal provided in the charging stand, an electromagnet is provided near the cordless terminal side charging terminal, A cordless telephone cordless handset, wherein the coil of the electromagnet is inserted into a charging current path from the cordless terminal to the battery and is magnetized by the charging current to strengthen contact between the charging terminals.