JPS59185323A - Power supply device - Google Patents

Abstract

PURPOSE:To discharge the charge of a backup capacitor at the replacement of a battery and to prevent the generation of a fault by connecting a shorting switch between the terminals of a power supply battery. CONSTITUTION:The titled device is provided with a counter 4 counting the using time of the power supply battery BAT1 for a data imprinting device and displaying an alarm indicating the end of the life of the battery after passing a fixed time, the capacitor C1 backing up the battery BAT1 at the light emitting of the lamp L and a switch SW1 enabled to short between the terminals A and B of the power supply. The SW1 is shorted at the removal of the battery and is temporally shorted at the insertion of the battery to discharge the charge of the C1. When a new battery is inserted immediately after the removal of the battery, the generation of a fault due to the charge of the C1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device, and in particular, the present invention relates to a power supply device, such as a data imprinting device for a camera, etc., which is equipped with a means for determining the lifespan of a power supply battery and displaying a notice indicating when to replace it, and a backup capacitor. This relates to a power supply device in a device.

In a data imprinting device for a camera that has an electronic clock circuit and displays data such as date, hour, and minute on a liquid crystal display and imprints the data onto the film by illuminating the data with a lamp or the like, the power supply is Batteries (1) There are known batteries that use a timer to start counting and display an electro-optical device such as a liquid crystal display when the time for replacement is reached.

The batteries used in such devices are small and low capacity, similar to those used in wristwatches, card calculators, etc.
When a light source such as a lamp emits light, the display performance of the electro-optical device is maintained in response to a voltage drop during the light emission period, or the function is prevented from being impaired due to chattering of battery contacts due to impact. Therefore, it is necessary to back up with a capacitor.

In devices having such a backup capacitor, due to its backup function, the circuit continues to operate for a certain period of time even if the battery is removed when replacing the battery. Therefore, there is an inconvenience in that the display on the determination device as described above does not indicate that it is time to replace the battery. In order to avoid this inconvenience (2), it is necessary to replace the backup controller after removing the battery, which makes replacing the battery extremely troublesome.

The present invention solves the above-mentioned conventional drawbacks by forcibly discharging the charging voltage of the backup capacitor and resetting the timer circuit.

An embodiment in which the present invention is applied to a back cover type data imprinting device will be described below with reference to the drawings.

FIG. 1 is a block diagram of the electric circuit in this embodiment.

In the figure, BAT 1 is a power battery for a data imprinting device housed in the back cover of the camera. swl is (3) a lamp as a personal illumination light source, and Q is an npn transistor that controls lighting of the lamp L.

()3, G4 If, Re) v Buffer gate with shift function e, G1 and G2 are liquid crystal drive circuits with level shift function, 6 is from low level (hereinafter referred to as LL) to high level (hereinafter referred to as HL) ) is a monostable multivibrator that starts operating at the rising edge of the input signal.

BAT2 is the power supply battery on the camera body side, SW2 is the switch that is linked to the camera's shooting operation, R is the bias resistor,
These form a trigger circuit for causing the light source lamp L to emit light. C1 indicates a backup capacitor. 1 is a voltage clamp circuit which, when the input voltage is high, supplies a constant voltage to each circuit that receives its output, and when the input voltage is lower than the constant voltage, supplies the human voltage to each circuit.

2 generates a reference clock signal using a crystal oscillator or the like,
This is an oscillation frequency divider circuit that divides the frequency of the reference clock signal. 3
is a counter decoder circuit that receives the output of the oscillation frequency divider circuit 2, counts the date, etc., and decodes the counted (4) signal.
4 is a counter circuit having a reset input that receives the output of the oscillation frequency divider circuit 2 and performs counting. SW3 is a switch circuit such as a transmission gate having a control input terminal C, 5 is a liquid crystal display device, and 8 is a known power-up clear circuit (hereinafter referred to as PUOL path).

The positive pole of the power supply battery BAT 1 is connected to the circuit power supply terminal A, and the negative pole is connected to the circuit power supply terminal B and grounded. The power supply terminal A is connected to one end of the switch sw1, and the other end of the switch is connected to the original terminal B. One end of the lamp L is connected to the positive electrode of the power supply battery BAT1 via the power supply terminal A, the other end of the lamp is connected to the collector of the transistor Q, and the emitter of the transistor Q is grounded. The input of the buffer gate G5 is connected to the output of the monostable multivibrator 6, the input of the buffer gate G4 is connected to the output of the monostable multivibrator 6,
The output is connected to the control input terminal C of the switch circuit SIM3.

(5) Clamp circuit 10 input is connected to battery BAT via power supply terminal A.
1, and its output is the positive power supply terminal (2) of the oscillation frequency divider circuit 2, counter decoder circuit 3, counter circuit 4, monostable multi-bi break 6, and PUO circuit 8.

. are connected, and the negative power supply terminal GND of each of the above circuits is grounded. The input of the monostable multivibrator B is connected to one end of the resistor R of the trigger circuit, and the other end of the resistor R is grounded. The output of the oscillation frequency divider circuit 2 is connected to the inputs of the counter decoder circuit 3 and the counter circuit 4, and the output of the counter decoder circuit 3 is connected to the liquid crystal drive circuit G1.
A data display liquid crystal device 5-1 of the liquid crystal display device 5 via
The output of the counter circuit 4 is connected to the liquid crystal drive circuit G.
2, a liquid crystal display device w, a dedicated determination liquid crystal device 5-
Connected to 2.

The PUO circuit 80 input is connected to the battery BA via the power supply terminal A.
The output is connected to the reset manual R of the counter circuit 4.

The positive electrode of the power supply battery BAT2 is connected to one end of the switch sw2, the other end of the switch is connected to the input of the monostable multivibrator 60, and the negative electrode of the battery BAT2 is grounded.

Terminal a of the switch circuit SW3 is connected to the positive pole of the power supply battery BAT1 via the power supply terminal A, the terminal of the switch circuit is connected to the positive pole of the capacitor C1, and the negative pole of the capacitor is grounded. .

Further, the positive electrode of the power supply battery BAT1 generates a voltage 1 as an axis, and generates a circuit power supply voltage v2 through the clamp circuit 1, and also generates the circuit power supply voltage v2 through the switch circuit SW5.
A voltage 3 is generated across the terminal.

Buffer gate G3. The 'tt source terminal of G4 is connected so that the power supply voltage is 1, and the power terminals of the liquid crystal drive circuits G1 and G2 are connected so that the 'wL source' voltage is 6. In addition, the oscillation frequency divider circuit 2, counter decoder circuit 3, counter circuit 4, and monostable multivibrator 60 are connected such that the source voltage is given the voltage v2 (7).When the switch sw1 is off, the voltage v1 is applied, Voltage 2 is applied from the clamp circuit 1 to the oscillation frequency divider circuit 2, counter decoder circuit 3, counter circuit 4, monostable multivibrator 6, and PUO circuit 8, and each circuit starts operating. The output of the monostable multivibrator B is normally low level, and LL is transmitted to the control input terminal C of the switch circuit SWS via the buffer gate G4.
Since the b terminal is set to a conductive state, the capacitor C1 is charged, and at this charging time t''mEEV3, the liquid crystal drive circuit G1 and -
A pulse that becomes instantaneous KL is generated, the count contents of the counter circuit 4 are reset to the HL period of the pulse, and counting is started thereafter. This counter circuit 4 counts up after a period of time commensurate with the period during which the battery used can guarantee the data imprinting function of the camera, and displays its output on the lifespan determination liquid crystal device 5-2 via the drive circuit G2.

When I learned from the above display that it was time to replace the υ battery (8), I removed the battery BAT 1 and switched sw1.
is on, both ends of capacitor C1 are connected to switch circuit S.
It is short-circuited through W5 and all circuit functions except trigger circuit 7 disappear.

The switch circuit SWX transmits signals in both directions so that the switch sw1 is turned off, and the counter circuit is a time chart showing the changes in each voltage until after the oil is removed. For comparison, the state of voltage change in the case where no voltage is present is shown for comparison.

) Referring to FIG. 2, when the switch sw1 is turned from on to off due to battery loading, a pulse is generated from the instantaneous PUO8, and after the counter circuit 4 is reset as described above, counting is started.

Next, when the switch 5W2 (9) is turned on in response to the camera release, the output of the monostable multivibrator 6 (
A pulse that becomes ML for a certain period of time is generated at 6-OUT), and this pulse becomes the output of the buffer (output) G3 to cause the lamp L to emit light for a certain period of time, thereby performing data imprinting. During this lamp emission period t1, the switch circuit sw3 is connected to the control input terminal C.
becomes HL and a.

There is no continuity between terminals B, and the liquid crystal device f5 is driven by the charging voltage 3 of the capacitor. This voltage v3 is the above t
It gradually decreases during one period to the voltage Vl). The illustrated voltage Va indicates the voltage at which the battery voltage v1 has decreased due to lighting of the lamp, and Vc indicates the minimum operation of the oscillation frequency divider circuit 2, counter decoder circuit 3, counter circuit 4, monostable multivibrator 6, and PUC circuit 8. It indicates voltage. When it is time to replace the battery, remove the power supply battery BAT1, the switch SW1 will turn on, and the capacitor C1 will turn on.
The battery voltage v1, the circuit source voltage 2, and the charging voltage v3 of the capacitor C1 are discharged, and all circuit operations stop.

On the other hand, when there is no switch sw1, each company (10) pressure V1. V2. (2) State 3 will be explained with reference to the time chart of FIG.

The state from loading the battery to before removing it is the same as that shown in FIG. 2, so the explanation will be omitted.

When the battery is removed, since there is no switch sw2, the photoelectric voltage V3 of the capacitor C1 changes to the bidirectional switch circuit 5vr3.
At the same time, the voltage 1 is applied to the circuit through the clamp circuit 1, and the power supply voltage 2 is maintained for a while through the clamp circuit 1. Since the lowest operating circuit 8 of each circuit does not generate a pulse, the counter circuit 4 No reset signal is input, the counter contents are not reset, and the state from which the battery was removed is maintained. Therefore, even if a new battery is inserted during the t2 period, the display on the lifespan determination liquid crystal display device will not change and will continue to warn that it is time to replace the battery.

Next, according to FIGS. 4 to 6, the switch 8W in the present invention
The configuration of 1 will be explained.

(11) In the figure, 12 is the back cover of the camera, which holds a data imprinting device between it and the inner cover 11.

11a is a battery chamber wall provided integrally with the inner lid 11, and is adapted to house a coin-type battery 16 (corresponding to the BAT 1). Reference numerals 11b and 11c are protrusions provided at the entrance of the battery chamber to prevent the battery from flying out. A contact spring 13 has a contact point that contacts the negative electrode of the battery, and is soldered to a printed wiring board 17 provided inside the inner lid 11. Reference numeral 14 indicates a contact spring whose both ends are fixed to the printed wiring board 17 so that the contact 14a is in contact with the side surface 16b (positive electrode) of the battery, and 15 indicates a battery cover. As shown in FIG. 5.6, the one-side contact spring 16 is provided with an arm 151) that extends sideways from the vicinity of the contact portion 13a.
When the battery is not loaded, it is in contact with its lower end 141) as shown in Figures 4(b) and 5, and when the battery is loaded, it is in contact with the lower end 141) as shown in Figure 4(a). It is pushed away from the contact piece 14 by the battery. These contact pieces i4, 13 form the power supply terminals A, B and the switch sw1 (12) in the above-mentioned circuit, and are turned off in the battery device state and turned on when the battery is removed.

7 to 9 show an embodiment in which the switch sw1 is turned on momentarily when the battery is installed. In the figure, reference numeral 18 denotes m contact piece springs, and all other members are the same as in the previous embodiment. The contact spring 18 has two raised arm parts 18a and 18b that contact the negative electrode 16a of the battery, and one arm 18a, together with the child side contact piece 14, shows a cross section of the switch SW1 chamber. Arm 18a of contact piece 18
, 18b are in a free state and are apart from the contact piece 14. That is, the switch sw1 is in an off state. When loading the battery 16, the above-mentioned protrusion prevention protrusion 11 is installed at the entrance of the battery chamber a.
b and 11c, it is necessary to insert the detached pond 16 at an angle as shown in FIG. 8(b). At this time, the ten poles 16'b on the side surface of the battery come into contact with the contact 14a, and the ten poles on the bottom side also come into contact with the arm 18a of the contact piece 1B, turning on the switch sw1. As a result, the electric charge v3 of the capacitor C1 is instantly discharged as described above (for one thing, the electric charge v3 of the capacitor C1 is instantly discharged. From this state, when the battery 16 is further pushed in, as shown in FIG.
As shown in C), the arms 18a and 18b of the contact piece 18 are in contact with one pole 16a of the battery, so that a voltage is applied to the circuit.

At this time, the PUO circuit 8 generates a pulse to reset the count contents of the counter circuit 4, and the counter circuit starts counting anew.

As described above, the present invention includes a counter for counting the usage time of the power battery and displaying a warning that the battery has reached the end of its life after a certain period of time, and a capacitor for backing up the power battery when the lamp is emitted. In the data imprinting device equipped with the device, a switch is provided that can short-circuit the power supply terminals of the circuit, and when replacing the power supply, the switch is short-circuited by removing the battery, or when producing a battery, by instantaneous short-circuiting, the backup capacitor can be short-circuited. Since the structure is configured to discharge the electric charge, even if a new battery is loaded immediately after removing the battery, there will be no failure due to the electric charge in the backup capacitor, and the timer circuit (14) will start operating correctly, unlike the conventional one. This eliminates the hassle of replacing batteries.

In the embodiment, the backup capacitor is used only to drive the liquid crystal when the lamp is emitting light, but it can also easily serve as a backup for other circuits.

Furthermore, the present invention is not limited to data imprinting devices, but includes a capacitor that backs up circuit functions, display functions, etc., counts the life of the power battery from the time of the device, and displays an oath after a certain period of time has elapsed. It is effective in devices designed to perform

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a circuit according to an embodiment of the present invention. Fig. 2 is a time chart in the same circuit, Fig. 5 is a time chart when the switch sw1 in Fig. 1 is removed, Figs. 4 to 6 are cross-sectional views of the battery compartment, and Fig. 5 shows the inside of the battery compartment. (15) Perspective view: FIG. 6 is a perspective view showing the shape of the switch contact piece. Figures 7 to 9 show the structure of the switch in other embodiments. Figure 7 is a cross-sectional view of the battery compartment during loading of electric camphors, and WJB diagram (c) is a cross-sectional view of the battery compartment after loading of food batteries. FIG. 9 is a cross-sectional view of the battery chamber in the closed state, and FIG. 9 is a perspective view showing the shape of the switch contact piece. BATl...Power supply batteries A, B...Power terminal L...Light source lamp C1...Backup condenser sw1...Short switch 3...Counter decoder circuit 4...Counter circuit 5... Liquid crystal display device 15.14.18...Switch contact piece 16...Power battery Slq Q k k k Cq Home-N n) >> Sea-149- (C)

Claims (1)

[Scope of Claims] A battery, a plurality of circuits operated by the power supply battery, and a capacitor for backing up the circuit functions, and a switch for connecting the battery to the battery. A power supply device characterized in that: