JPH0223066Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching attachment that allows switching between an internal battery and an external power source.

For example, when it comes to switching between internal and external power sources in a camera, conventionally it has been common to remove the internal battery and connect it to an external power source. There is a problem with storage. For this reason, the camera body has an internal battery built-in and an external power supply connection terminal, and when an external power supply is connected to this external power supply connection terminal, it automatically switches to the external power supply. is proposed. 1 and 2 show conventional examples of this type of switching device. In both figures, reference numeral 1 denotes a connector seat made of an insulating material and fixed to the camera body 2 with screws or the like, and external power supply connection terminals 3, 3 are fixed to this connector seat 1. The connection terminals 3, 3 have insertion parts 3a, 3a for fitting into the external power source 4, fixing parts 3b, 3b for connecting to the connector seat 1, and lead wire connection parts 3c, 3c.
Lead wires 6, 6 connected to the electric circuit 5 are connected to c, 3c.
is soldered. The lead wires 6, 6 are branched, and one is connected to one electrode terminal 8a of the internal battery 7.
The other terminal is connected to the other electrode terminal 8 via the switch 9.
connected to b. Switch 9 is connector seat 1
It can be opened and closed by a switching pin 10 that can be retracted from the bottom of the switch, that is, can be slid in the axial direction.
This switching pin 10 normally protrudes due to the spring properties of the switch 9 and closes the switch 9, but when pressed by the bottom of the external power source 4, the switch 9 is opened.

Therefore, in this conventional device, when the external power source 4 is not installed, the switch 9 is closed as shown in FIG. 1, so that the electric circuit 5 is supplied with power from the internal battery 7. On the other hand, as shown in Fig. 2, the external power supply 4 is attached to the connector seat 1, and the external power supply connection terminals 3, 3
When connected to the external power supply terminals 11, 11, the switching pin 10 is simultaneously pressed and displaced by the bottom of the external power supply, and the switch 9 is opened. Therefore, the electric circuit 5
The power from the external power supply 4 will be supplied to the power supply.

However, this conventional mounting requires the provision of a special opening/closing switch 9, resulting in the following drawbacks. That is, providing a special switch 9 is disadvantageous in that it increases the number of parts and increases the installation space, and there is also the problem that an increase in contact resistance due to the switch causes a voltage drop. Particularly in devices that handle small voltages, such as cameras, an increase in contact resistance often has a more adverse effect than expected, and this conventional installation requiring the switch 9 was not necessarily ideal.

The present invention was created based on the idea of configuring a direct changeover switch mechanism with the external power connection terminal on the connector seat and the internal battery, in line with this awareness of the problems with conventional installation. A circuit that uses an internal battery is configured by being able to connect to and separate from the connection terminal, and by energizing them so that they are always in contact.On the other hand, when an external power source is connected, the internal battery is connected to the external power source in conjunction with the attachment operation. It is characterized by being separated from the terminal.

The invention will now be described with reference to the illustrated embodiments. 3 and 4 show an embodiment of the present invention, and common parts with the conventional apparatus shown in FIGS. 1 and 2 are given common reference numerals. Internal battery 7 is in camera body 2
The battery is housed in a housing tube 12 provided at the bottom of the housing tube 12, and an internal battery terminal 13 having a spring property is located at the bottom of the housing tube 12. One of the external power supply connection terminals 3 fixed to the connector seat 1 is located directly above this storage tube 12, and the internal battery 7 is normally connected to the lead wire connection portion 3c end of this connection terminal due to the spring properties of the terminal 13. is in contact with This lead wire connection part 3c
The lead wire 14 connected to is directly connected to the electric circuit 5, and the lead wire 6 connected to the other connecting terminal 3 is connected to the electric circuit 5 and the internal battery connecting terminal 13 as in the conventional device.

The switching pin 10 has the same installation position and sliding ability as the conventional device, but its inner end can directly contact the internal battery 7, and when pressed by the external power source 4, the terminal 13 is bent to separate the internal battery 7 from the external power supply connection terminal 3.

Therefore, according to this device having the above configuration, when no external power supply is attached, the internal battery 7 is connected to the external power supply connection terminal 3 due to the springiness of the internal battery connection terminal 13 as shown in FIG. Electrical power from the internal battery is supplied to the electric circuit 5 through the lead wires 6 and 14.

On the other hand, when the external power supply 4 is attached to the connector seat 1 and the external power supply connection terminals 3, 3 are connected to the external power supply terminals 11, 11 as shown in FIG. 4, the bottom of the external power supply 4 presses the switching pin 10 at the same time. For displacement, the switching pin 10 pushes the internal battery 7 away from the external power connection terminal 3. Therefore, the electric circuit 5 is now connected to the external power source 4 via the lead wires 6 and 14.
electricity will be supplied.

In the above embodiment, the switching pin 10 for separating the internal battery 7 from the external power supply connection terminal is slidably provided at the bottom of the connector seat 1. The external power source 4 is inserted into this hole to connect the internal battery 7.
It can also be constructed by integrally providing a switching pin for pushing down. Furthermore, the insertion/removal opening for the internal battery 7 into the storage tube 12 can be provided at an appropriate location.
It is most practical to use the connector seat 1 as an opening/closing body for the storage tube 12.

In summary, the device for switching between two internal and external power sources of the present invention has an internal battery connected to and separated from an external power supply connection terminal to form a switch for switching between two internal and external power sources, and is therefore superior to conventional devices that require a separate switch. However, it is possible to reduce the number of parts and installation space, and furthermore, it is possible to exhibit stable electrical performance without increasing contact resistance due to a special switch.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of essential parts of an example of a conventional switching device for two internal and external power sources, showing states when an external power source is not installed and when an external power source is installed, respectively. FIGS. 3 and 4 are cross-sectional views of essential parts of an example of a switching device for two internal and external power sources according to the present invention, showing states when an external power source is not installed and when an external power source is installed, respectively. 1...Connector seat, 2...Camera body, 3...
... External power supply connection terminal, 4 ... External power supply, 7 ... Internal battery, 10 ... Switching pin, 11 ... External power supply terminal, 12 ... Storage cylinder, 13 ... Internal battery connection terminal.

Claims (1)

[Claims for Utility Model Registration] (1) It has an internal battery and an external power supply connection terminal, and the power supply used is switched from the internal battery to the external power supply in response to the operation of attaching the external power supply to the external power supply connection terminal. In the switching device for two internal and external power sources, the internal battery is provided so that it can be connected to and separated from the external power supply connection terminal, and is normally energized so as to be in contact with the connection terminal to form an internal battery circuit. A switching device for two internal and external power sources, characterized in that a separating means is provided for separating the battery from the external power source in conjunction with the mounting operation of the external power source. (2) In claim 1 of the utility model registration claim, the energizing means for energizing the internal battery is a switching device for two internal and external power sources, which is an internal battery connection terminal having a spring property and in contact with one electrode of the internal battery. .