JPH0419714Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power supply device for a portable electronic device such as a pocket computer, and more particularly to a power supply device for an electronic device equipped with a volatile memory backup battery.

[Prior art]

Conventionally, electronic devices such as pocket computers mainly consist of a calculation section, a storage section for storing programs, or a display section using liquid crystal or the like and its drive section, etc., and as a power source, it is portable. Batteries are used for a reason. However, when a volatile memory is used as the storage section, the power supply to the storage section is cut off when the battery is exhausted or when the battery is replaced, so a backup battery such as a lithium battery is used.

[Problems with conventional technology]

However, in pocket computers etc.
Each battery is designed to be removed by opening the lid, so if you accidentally remove the backup battery when replacing the batteries, the power to the storage unit will be completely cut off and the data stored in the memory will be lost. There was a drawback that it was difficult to use.

[Purpose of invention]

In view of the above drawbacks, it is an object of the present invention to provide a power supply device for a storage device that can prevent the main battery and the backup battery from being removed at the same time, thereby reliably protecting stored data.

[Summary of the idea]

In order to achieve the above object, the present invention includes a main battery that supplies power to elements that perform calculations, display, etc., a backup battery that has a lower voltage than the main battery and protects data stored in the storage section, and It has a first diode that connects the battery to the storage section, and a second diode that connects the backup battery to the storage section. In a power supply device that protects stored data and blocks power supply to the above-mentioned elements, and replaces each battery by opening and closing the lid, the lid of the backup battery is removed in conjunction with the removal operation of the main battery. By engaging with the engaging part formed inside,
The present invention is characterized in that a prohibition mechanism is provided for prohibiting removal of the backup battery.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the description will be given using a power supply device for a pocket computer as an example. FIG. 3 is a perspective view showing the appearance of the pocket computer.

In the figure, reference numeral 1 denotes the main body of a pocket computer, and its operation surface is equipped with a power switch 2, a display section 3 using liquid crystal, and an input section 4 consisting of a large number of keys. This main body 1 uses three AA batteries as the main battery, and has a battery storage section on the front side of the main body 1,
Replacement can be performed by opening and closing the lid 5. Further, the main body 1 uses a lithium battery as a battery for backing up the memory, and has a battery accommodating portion on the side of the main body 1, and can be replaced by opening and closing the lid 6. Note that the lids 5 and 6 can be opened by sliding in the direction shown in the figure, as described later.

FIG. 4 shows a schematic circuit diagram of the pocket computer.

7 in the figure is the central processing unit (hereinafter referred to as CPU)
It performs calculations according to instructions input from the input unit 4 and displays the calculation results on the display unit 3. Further, 8 is a volatile random access memory (hereinafter referred to as RAM), which has functions such as storing a program input from the input unit 4. A main battery 9 using a dry cell is used as a power source for the CPU 7 and RAM 8, and a backup battery 10 is used as a backup for the RAM 8 when the main battery 9 is removed. In this case, the voltage of the main battery 9 is 4.5V, the voltage of the backup battery is 3.0V, and both batteries 9 and 10
is connected to the diode OR by diodes 11 and 12 and is supplied to the power supply terminal V _D of RAM8, so power is normally supplied from the main battery 9.
When the main battery 9 is exhausted or when it is cut off such as when being replaced, power is automatically supplied from the backup battery 10. Furthermore, even if the power switch 2 is turned on when the main battery 9 is cut off, the diode 11 disconnects the power from the backup battery 10 to the CPU 7.
Therefore, the backup battery 10 supplies power only to the RAM 8.

FIG. 1 is a sectional view showing a state in which a main battery 9 and a backup battery 10 are housed in a pocket computer main body 1. As shown in FIG. Note that in FIG. 1, parts other than the vicinity of the battery are omitted.

A main battery accommodating portion 13 is provided within the pocket computer main body 1, and main batteries 9 are housed in series in the accommodating portion 13. When replacing the main battery 9, first slide the lid 5 in the direction of arrow A, and then move the lid 5 in the direction of arrow B to open it. Thereafter, the exhausted battery is removed, a new battery is loaded, and the main battery 9 is replaced. In addition,
When the lid 5 is closed, the clasp 5a formed at one end of the lid 5 and the clasp 1a formed on the case of the main body 1 are engaged with each other and locked. When opening the lid 5, first close the lid 5a. Push the clasp 5a side of 5 to release the lock and then slide.

Also, inside the main body 1 is a backup battery storage section 1.
4, and a backup battery 10 is housed in the housing section 14. Similarly, move the lid 6 to arrow C.
direction, and then move in direction D to open and replace. In addition, when the lid 6 is closed, the clasp 6a of the lid 6 and the clasp 1b of the main body 1 on the case side are engaged with each other and locked.
Press to release the lock, then slide.

At the rear of the main battery accommodating portion 13, a negative electrode 15 of the main battery 9 made of a metal material is provided so as to be rotatable about a rotation shaft 16 as a fulcrum. This negative electrode 1
5 has one end bent at a substantially right angle toward the main battery accommodating portion 13 side to form a bent portion 15a, and one end of the leaf spring 17 is fixed to the negative electrode 15, and the other end is fixed to the inner wall of the case of the main body 1. By doing so, the bent portion 15a of the negative electrode 15 is urged toward the main battery 9 side. Thereby, when the main battery 9 is loaded into the main body 1, the bent portion 15a is brought into pressure contact with the negative electrode of the main battery 9, and the tip of the bent portion 15a can be brought into contact with the negative electrode of the main battery 9 reliably.
The other end of the negative electrode 15 is bent at a substantially right angle toward the lid 6 to form an engaging portion 15b.
An engaging portion 6b is formed on the lid 6 side opposite to. In this case, when the main battery 9 is loaded,
The engagement portion 15b of the negative electrode 15 and the engagement portion 6b of the lid 6 are in a disengaged state, and the backup battery 10 can be replaced by opening the lid 6.

On the other hand, when the lid 5 is opened and the main battery 9 is removed,
As shown in FIG. 2, the negative electrode 15 rotates clockwise in the drawing about the rotation shaft 16 due to the spring pressure of the leaf spring 17. As a result, the engaging portion 15b formed on the negative electrode 15 is connected to the engaging portion 6 of the lid 6.
b, the lid 6 of the backup battery 10 is prohibited from sliding, and the lid 6 is in a locked state. Therefore, when removing the main battery 9,
Since the lid 6 of the backup battery 10 is automatically locked, the backup battery 10 cannot be removed, and the main battery 9 and the backup battery 10 can be prevented from being removed at the same time. As a result, power is supplied to the RAM 8 from one of the batteries in any case, so that storage data can be reliably prevented from disappearing.

Although the embodiments have been described using a power supply device for a pocket computer as an example, the present invention is not limited thereto, and can of course be used, for example, as a clock power supply for a clock radio. Also,
In the embodiment, an example is shown in which the negative electrode 15 is also used as a member for locking the lid 6, but the present invention is not limited to this, and a member exclusively for locking may be provided.

[Effect of idea]

As explained above, according to the present invention, it is prohibited to remove the backup battery when replacing the main battery, so it is possible to prevent the lid of the backup battery from being opened due to erroneous operation, thereby ensuring that the volatile memory This has the effect of protecting stored data.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view showing the state in which the lid of the backup battery is locked when the main battery is removed, Fig. 3 is a perspective view of the pocket computer, and Fig. 4 1 is a schematic circuit diagram of a pocket computer. 1...Pocket computer body, 2...Power switch, 3...Display section, 4...Input section 5, 6...
... Lid, 7 ... CPU, 8 ... RAM, 9 ... Main battery, 10 ... Backup battery, 11, 12 ...
...Diode, 13... Main battery housing section, 14...
Backup battery accommodating part, 15... negative electrode, 16... rotating shaft, 17... plate spring.

Claims (1)

[Scope of utility model registration request] A main battery that supplies power to elements that perform calculations, display, etc., a backup battery that has a lower voltage than the main battery and protects data stored in the storage unit, and a first battery that connects the main battery to the storage unit. It has a diode and a second diode that connects the backup battery to the storage unit, and both diodes allow the backup battery to protect the data stored in the storage unit and supply power to the element when the main battery is cut off. In a power supply device in which the battery is blocked and each battery is replaced by opening and closing the lid, the battery is engaged with an engaging portion formed inside the lid of the backup battery in conjunction with the removal operation of the main battery. A power supply device comprising a prohibition mechanism for prohibiting removal of the backup battery.