JPH0744670A - Electronic equipment - Google Patents

Abstract

PURPOSE:To provide an electronic equipment which is capable of interrupting power supply to a power supply terminal and preventing a power source part from shorting when a main body device is not arranged on the prescribed location of a power feeding device. CONSTITUTION:A power feeding switch 14 interrupting the power supply system of a power feeding device 2 in the middle of the arrangement operation of a main body device 1 to the power feeding device 2 is interposed between a lithium battery and a power supply terminal 13 in the power supply system. Therefore, when the main body device 1 is arranged on a prescribed location of the power feeding device 2, the power feeding switch 14 is closed and the power of the lithium battery is supplied to the power supply terminal 13 and power is supplied from the power supply terminal 13 to the external power source terminal 8 of the main body device 1, but in the middle of the arrangement operation of the main body device 1 for the power feeding device 2, the power feeding switch 14 is not closed and the power of the lithium battery is not supplied to the power supply terminal 13. As a result, even if a pair of power supply terminals 13 are electrically connected by the metal panel, etc., of the main body device 1, the lithium battery does not short.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as a card type calculator.

[0002]

2. Description of the Related Art For small electronic devices such as card type calculators,
In addition to the calculation function, there is one having a data bank function of storing data such as an address and a telephone number in a storage element and reading the stored data as needed to display the data on a liquid crystal display unit. Such a small electronic device does not require high power when performing calculations or reading data from a storage element and displaying the data on a liquid crystal display unit, and therefore a solar power supply capable of obtaining a voltage of about 1.5 V is used. Although a battery is sufficient, a high power is required to write and store data in the storage element, and thus a lithium battery having a voltage of about 3 V needs to be used as a power supply battery.

By the way, as a result of investigating the actual use state of such a small electronic device, data such as an address and a telephone number is rarely registered when the user carries it with him and goes out. Often, the read data is read and displayed on the liquid crystal display. For this reason, this small electronic device does not require too high power when carried, so it is uneconomical to incorporate a lithium battery,
Moreover, since the thickness of the lithium battery is as thick as about 3 mm, the thickness of the lithium battery makes the entire device thicker,
Poor portability.

For this reason, conventionally, a small electronic device is divided into a card type main body device and a power feeding device, and usually only the card type main body device is carried, and data such as an address and a telephone number are registered. Sometimes, a power supply device is used to supply high electric power. In this case, the card-type main body device is provided with a key input unit, a liquid crystal display unit, a solar battery, a storage element, an LSI, and a pair of external power supply terminals. In addition, the power supply device is provided with a pair of power supply terminals with which the external power supply terminal of the main body device comes into contact with and separates from each other and a lithium battery that supplies high power. Note that the power supply terminal is directly connected to the lithium battery in the power supply device and is constantly supplied with power.

[0005]

However, in this conventional small-sized electronic device, a metal panel is provided on the surface of the main body device in order to protect the LSI and the storage elements in the main body device from external static electricity. If the main unit is not placed at the predetermined position of the power feeding unit or if the main unit is placed upside down, the metal panel on the surface of the main unit contacts the power supply terminal of the power feeding unit, and as a result, the metal There is a problem that the lithium battery is short-circuited via the panel and heat is generated. The present invention has been made in view of the above circumstances, and an object thereof is to prevent power supply to a power supply terminal when a main body device is not arranged at a predetermined position of a power supply device to prevent a short circuit of a power supply unit. It is to provide an electronic device that can do this.

[0006]

To achieve the above object, the present invention provides a main body device having an external power supply terminal, a power supply terminal at which the external power supply terminal is in contact with and detachable from the main body device, and a power supply to the power supply terminal. An electronic device including a power supply device having a power supply unit for supplying the power supply device, wherein the power supply device is provided with a switch unit interposed between the power supply unit and the power supply terminal in the power supply system. It is characterized in that the power supply system is shut off during the operation of disposing the main body device on the power supply device.

[0007]

According to the present invention, when the main body device is arranged at a predetermined position of the power feeding device, the switch means is closed to supply the power of the power source portion to the power supply terminal, and the power supply terminal supplies the power to the main body device. Power will be supplied to the external power supply terminal, but the switch means will not close during the placement operation when the main unit is not located at the prescribed position of the power supply device, and power from the power supply unit will be supplied to the power supply terminal. Therefore, even if the power supply terminal is electrically connected by the metal panel of the main body device, the power supply unit is not short-circuited.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an external perspective view of a small electronic device. This small electronic device includes a card-type main unit 1,
The power supply device 2 for supplying electric power to the main body device is provided. The main body device 1 has a calculation function and a data bank function. On the upper surface of the main body device 1, a key input unit 3 for inputting data, a liquid crystal display unit 4 for displaying the input data and stored data described later, and a power not too high (for example, 1.5 V). A solar battery 5 that supplies a voltage of a certain degree) is provided. In this case, the solar battery 5 has a thickness of about 1 mm.
In addition, an E ² PROM (memory element) 6 capable of writing data and electrically erasing data is provided inside the main body device 1. Furthermore, a pair of external power supply terminals 7 and 8 and a rectangular engagement recess (engagement portion) 9 are provided in the upper right corner of the lower surface of the main body device 1. In this case, although not shown, the pair of external power supply terminals 7 and 8 are buried via an insulating film so as not to come into contact with the metal panel on the surface of the main body device 1, and the surface is flush with the lower surface of the main body device 1. Exposed. In addition, the engagement concave portion 9 has the external power supply terminals 7 and 8 in the insertion direction of the apparatus body 1 (direction of arrow Y).
It is provided near the front side of.

The power feeding device 2 is formed into a substantially cubic shape as a whole, and is provided with a power feeding insertion portion 10 from which a part of the main body device 1 is removably inserted, from the front surface to both left and right side surfaces. Has become. In this case, as shown in FIG. 2, a lithium battery (power supply unit) 11 capable of supplying electric power higher than that of the solar battery 5 (for example, a voltage of about 3 V) is provided inside the power supply device 2. As shown in FIG. 2, a pair of power supply terminals 12 and 13 and a power supply switch 14 are provided inside the power supply device 2 located below the power supply insertion section 10.

As shown in FIG. 2, one of the power supply terminals 12 is provided with a contact portion 12a bent in an inverted V shape in the middle portion of a metal plate, and the contact portion 12a is on the lower side of the power feeding device 2. 3 is attached to the inner upper surface of the lower side of the power feeding device 2 in a state of protruding into the power feeding insertion portion 10 through the opening 10a provided in the inner upper surface (FIG. 3).
(See (a)). This power supply terminal 12 has one end 1
2b extends toward the lithium battery 11 side, and the extended one end 1
2b is electrically connected to one electrode of the lithium battery 11 (for example, the positive electrode on the side surface of the lithium battery 11) by the connecting member 15. The other power supply terminal 13 has
Similar to the one power supply terminal 12, a contact portion 13a is provided in an intermediate portion of the metal plate as shown in FIG. 3A, and the contact portion 13a is provided on the lower inner upper surface of the power feeding device 2. The structure is attached to the inner upper surface of the lower portion of the power feeding device 2 in a state of protruding into the power feeding insertion portion 10 through the opening 10b. As shown in FIG. 2, the power supply terminal 13 has one end 13 b extending from the power supply switch 14.

The power feeding switch 14 comprises a switch spring 16 attached to the lower inner surface of the power feeding device 2 and a positioning button portion 17 attached to the switch spring 16, and the positioning button portion 17 is provided in the power feeding device 2. It has a structure that protrudes into and from the power supply insertion portion 10 through an opening 10c provided on the lower inner upper surface. In this case, one end 13b of the other power supply terminal 13 and the other electrode of the lithium battery 11 (for example, the lithium battery 11) are provided near the edge of the opening 10c on the lower inner upper surface of the power supply device 2.
End portion 18 of the connecting member 18 connected to the negative electrode on the lower surface of the
a and are extended. The switch spring 16 elastically supports the positioning button portion 17, and also has one end portion 13b of the other power supply terminal 13 and one end portion 18a of the connection member 18.
The power supply terminal 13 and the connecting member 1 are contacted with and detachable from
8 is electrically connected. Further, the positioning button portion 17 is pushed up by the spring force of the switch spring 16 when the main body device 1 is inserted into the power feeding insertion portion 10 of the power feeding device 2 and the engaging concave portion 9 of the main body device 1 corresponds to the positioning button portion 17. 9 is engaged, and the main body device 1 is thereby positioned. The power supply switch 14 is arranged on the front side of the pair of power supply terminals 12 and 13 in the insertion direction of the main body device 1 (direction of arrow Y).

In such a small electronic device, when the user goes out, only the main body device 1 is carried, and the power of the solar battery 5 is sufficient for reading and calculating data which does not require high power. be able to. In addition, when registering data such as addresses and telephone numbers, the main unit 1
Part of the data can be inserted into the power feeding insertion portion 10 of the power feeding device 2 to register data. At this time, when a part of the main body device 1 is inserted into the power feeding insertion portion 10, first,
As shown in FIG. 3B, the positioning button portion 17 of the power feeding switch 14 resists the spring force of the switch spring 16 and the main body device 1
The switch spring 16 is separated from the one end portion 13b of the other power supply terminal 13 and the one end portion 18a of the connection member 18 by being pushed down by the power supply terminal 13 and the connection member 18.
The electrical connection with is disconnected. Therefore, since the power from the lithium battery 11 is not supplied to the power supply terminal 13, even if the metal panel on the surface of the main body device 1 contacts the pair of power supply terminals 12 and 13, the lithium battery 11 is short-circuited. There is no. In this state, when the main body device 1 is further inserted and the engaging recess 9 of the main body device 1 reaches the positioning button portion 17 of the power feeding switch 14 as shown in FIG. It is pushed up by the spring force of the spring 16 and inserted into the engagement recess 9 of the main body device 1. Then, the main body device 1 is positioned at a predetermined position of the power supply device 2, the external power supply terminals 7 and 8 of the main body device 1 come into contact with the power supply terminals 12 and 13, respectively, and the switch spring 16 is connected to the other power supply terminal 13. The one end portion 13b and the one end portion 18a of the connecting member 18 are brought into contact with each other. This allows
The lithium battery 11 and the main body device 1 include a power supply terminal 12,
13 and the external power supply terminals 7 and 8 are electrically connected, and the power of the lithium battery 11 is supplied to the main body device 1, so that the data can be surely stored in the E ² PROM 6.

As described above, in this small electronic device, when the main body device 1 is not arranged at the predetermined position of the power feeding insertion portion 10 or when the main body device 1 is arranged upside down, FIG. As shown in FIG. 2, the main body device 1 causes the positioning button portion 17 of the power feeding switch 14 to switch the spring 1
6 is pushed down against the spring force of 6, and the switch spring 16 separates from the one end portion 13b of the power supply terminal 13 and the one end portion 18a of the connection member 18, and the power supply terminal 13 and the connection member 1
8 is not electrically connected, the power of the lithium battery 11 is not supplied to the power supply terminal 13. Therefore, even if the metal panel on the surface of the main body device 1 contacts the pair of power supply terminals 12 and 13, the lithium battery 11 is not short-circuited.

[0014]

As described above, according to the present invention, since the switch means for shutting off the power supply system is provided during the operation of disposing the main body apparatus on the power supply apparatus, the main body apparatus is provided at a predetermined position of the power supply apparatus. When the switch is placed, the switch means is closed to supply the power of the power supply section to the power supply terminal, which allows power to be supplied from the power supply terminal to the external power supply terminal of the main body device. When the main unit is not placed in the predetermined position, the switch means is not closed during the placement operation, and the power of the power supply is not supplied to the power supply terminal, so the power supply terminal is electrically connected by the metal panel of the main unit. Even if it is done, the power supply unit will not be short-circuited.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a part of the power feeding device of FIG.

3 is a cross-sectional view taken along the line AA in FIG. 2, in which (a) is an enlarged cross-sectional view of the main body device inserted into a predetermined position of a power feeding insertion portion of the power feeding device, and (b) is a power feeding insertion portion. The expanded sectional view of the state in the middle of inserting a main body apparatus.

[Explanation of symbols]

 1 Main Unit 2 Power Supply Device 7, 8 External Power Supply Terminal 9 Engagement Recess 10 Insertion Part for Power Supply 11 Lithium Battery 12, 13 Power Supply Terminal 14 Power Supply Switch 16 Switch Spring 17 Positioning Button Part

Claims (2)

[Claims] 1. An electronic device comprising: a main body device having an external power supply terminal; a power supply terminal having a power supply terminal with which the external power supply terminal is releasably contactable; and a power supply unit supplying power to the power supply terminal. The power supply device is provided with a switch unit interposed between the power supply unit and the power supply terminal in the power supply system, and the switch unit is provided during the operation of disposing the main unit on the power supply unit. The electronic device is characterized in that the power supply system is cut off. 2. The switch means includes a switch spring which comes into contact with the power supply terminal in a detachable manner and which supplies power from the power supply unit to the power supply terminal when the power supply terminal is in contact with at least the power supply terminal. Positioning for releasably engaging the engaging portion provided on the main body device to position the main body device and to bring the switch spring into contact with the power supply terminal when the main body device is arranged at a predetermined position. 2. A button part, comprising:
Electronic device described.