JPS6345073Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention uses a rechargeable secondary battery as a power source, and when charging, the selective call receiving device main body can be directly inserted into a dedicated charger. The present invention relates to a selective call receiving device with a charging terminal, the main body of which is equipped with a charging terminal.

Structure of the conventional example and its problems FIG. 1 shows a conventional selective call receiving device with a charging terminal, and FIG. 2 shows a charger for the selective call receiving device. The configuration of this conventional example will be explained below with reference to FIGS. 1 and 2.

In Fig. 1, 1 is a circuit unit of a selective call receiving device consisting of a printed circuit board on which circuit parts, batteries, etc. are mounted, 2 is a rechargeable secondary battery, 3 is a battery holder, and 4 is a positive battery of secondary battery 2. power terminal,
5 is a built-in loop antenna, 6 is a negative charging terminal of the secondary battery 2, 7 is a case of a selective call receiving device made of plastic or the like, 8 is a screw with a through hole in the center, and 9 is a hole for a negative charging terminal. It is. Further, in FIG. 2, 10 is the main body of the selective call receiving device consisting of the circuit unit 1, case 7, etc., 11 is the charger for the selective call receiving device, and 12 is the selective call receiving device main body.
AC plug, 13 is a contact pin for charging. Here, the internal circuit of the charger 11 rectifies the commercial power from the AC plug 12 and converts it into a stabilized DC voltage.
It outputs to a charging contact pin 13 consisting of a plus pin 13a and a minus pin 13b.

In Figure 1, the secondary battery 2 is placed in the battery holder 1.
3, and then house the circuit unit 1 of the selective call receiving device in the case 7 of the selective call receiving device, and screw it into the screw hole provided in the positive power terminal 4 with screw 8 to complete the circuit unit. 1 is fixed to case 7. At this time, the screw 8 is connected to the positive electrode of the secondary battery 2 via the positive power terminal 4. Further, the negative charging terminal 6 wired in advance to the negative terminal of the secondary battery 2 is partially visible through the hole 9.

Next, as shown in FIG. 2, when the AC plug 12 is plugged into an AC commercial power source and the selective call receiving device body 10 is inserted into the charger 11, the stabilized DC power generated at the positive pin 13a of the charging contact pin 13 is activated. The positive power is connected to the positive power terminal 4 via the screw 8, and the negative power is connected to the negative charging terminal 6 via the hole 9 from the negative pin 13b.
As a result, a DC power source is applied to both ends of the secondary battery 2, and the battery is charged.

However, in the above conventional example, compared to a selective call receiving device that uses a normal primary battery (dry battery), a hole 9 is added to enable the use of a secondary battery, and at the same time, a negative hole is placed on the circuit unit 1. It is necessary to newly install the charging terminal 6,
For this reason, it is not preferable in a selective call receiving device that requires miniaturization, and the negative power terminal 6
Therefore, it was necessary to change the layout of the unit 1, change the design of the printed circuit board, etc., which caused problems in terms of labor and cost.

Purpose of the invention The present invention is intended to eliminate the drawbacks of the above-mentioned conventional example, and aims to realize a selective call receiving device with a charging terminal at low cost without newly arranging a negative charging terminal on the circuit unit. It is something to do.

Structure of the invention In order to achieve the above object, the present invention uses a part of the existing circuit components as the negative charging terminal, and instead of installing a new charging terminal, it can be used as the negative charging terminal. It is effective.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows an embodiment of the present invention, in which the same components as in FIG. 1 are given the same numbers and their explanations are omitted. FIG. 4 is a circuit block diagram of the selective call receiving device of the present invention. In FIG. 4, 2 is a secondary battery, 5 is a loop antenna, 14 and 15 are loop antenna tuning capacitors, and 16 is a selective call receiving circuit section. , 17 is a buzzer, 18 is a positive charging terminal, and 19 is a negative charging terminal. In the configuration shown in the figure, the ground sides of the loop antenna 5 and the selective call receiving circuit section 16 are connected to the negative side of the secondary battery 2 in a direct current manner.

In FIG. 4, the loop antenna 5 receives radio waves as an antenna and achieves its original purpose of transmitting a signal to the selective call receiving circuit section 16 through the tuning capacitor 15. At the same time, the loop antenna 5 has a negative DC operating voltage. It is common to the negative charging terminal 19. Therefore, loop antenna case 7
The conductive portion 19a parallel to the bottom surface of the loop antenna 5 can be directly used as a negative charging terminal, and the loop antenna 5 is used not only as an antenna but also as a negative charging terminal.

In addition, as a negative charging terminal, instead of installing a dedicated charging terminal, use a circuit component with a negative potential as a DC voltage, such as a metal case of a coil with a rectangular metal case, or a shield case to shield the circuit. It can be easily inferred that this could be done, but in this case, new constraints arise, such as the need to provide a separate charging terminal. In the above embodiment, the conductive portion 19a of the loop antenna 5 is used to connect the unit 1 inside the part of the case 7 where the negative charging terminal is required.
A conductor surface that has a negative potential and is parallel to the bottom surface of the case 7 is provided, and this is also used as a negative charging terminal, so there is no need to provide a separate charging terminal. Note that it is desirable to provide the conductive portion 19a in close contact with the hole 9 as much as possible from the viewpoint of waterproofing and the like.

Effects of the invention The present invention has the above-mentioned configuration, and provides the following effects.

(a) A part of the antenna originally used for another purpose is also used as a charging terminal without installing any special parts for the charging terminal, so the dedicated charging terminal can be omitted, making it possible to downsize and reduce costs. becomes.

(b) In particular, when changing a selective call receiving device that uses dry batteries to a selective call receiving device that uses a secondary battery and has a charging terminal, the present invention allows the function to be activated simply by making a hole at an appropriate location in the storage case. can be added, significantly reducing the development design period and cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a conventional selective call receiving device, FIG. 2 is an external view of a charger for the selective call receiving device, and FIG. 3 is an exploded perspective view of a selective call receiving device in an embodiment of the present invention. FIG. 4 is a circuit block diagram of the same device. 1...Circuit unit, 2...Secondary battery, 5...
Loop antenna, 9... hole, 11... charger, 1
3... Minus pin, 19a... Conductive part.

Claims (1)

[Scope of utility model registration request] a circuit unit built into a case and equipped with at least circuit components and a secondary battery; a pair of holes provided in the case corresponding to charging pins of a charger used for charging the secondary battery; and the pair of holes. A terminal arranged inside one of the holes and connected to one electrode of the secondary battery, and a terminal arranged inside the other of the pair of holes and connected to the other polarity of the secondary battery. A selective call receiving device comprising an antenna having a conductive part parallel to the other hole at the same potential, the charging pin being brought into contact with the conductive part through the hole, and the antenna also serving as a charging terminal.