JPS58154672A - Device for checking battery - Google Patents

Abstract

PURPOSE:To obtain highly reliable checking device prevented from the miss of checking with a simple constitution by using a display element having a storing property and utilizing said property. CONSTITUTION:Since V1>V2 is formed during the period the voltage of a battery is changed in a range exceeding a prescribed value V0 fixed by the relation of reference voltage V2 and the resistance values of R1, R2, a transistor (TR) Q5 is turned off and an ECD is held at decolored state. When the battery is consumed and the voltage is reduced less than V0 at the time of t0, V1<V2 is formed only for the short moment and the TRQ5 is turned on. Consequently, the ECD is charged and colored. Then the current consumption is turned to the original state and the voltage V of the battery is restored, but the color is left as it is because of the storing property and the time to replace the battery (or charging time) is displayed. If the voltage of the battery is being reduced without restration, the TRQ5 is turned off before the dilution of the colored density, so that the colored state is held.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a battery checking device that detects and displays whether the voltage of a power source battery of a device using a battery is within the optical range. Conventionally, battery scavenging with large prize fluctuations, especially f
It is difficult to realize an accurate battery check device for equipment such as cameras with built-in electric shutters, which are usually under relatively light loads and intermittently generate large amounts of electricity for very short periods of time. It was difficult and rare. In these devices, it is desirable to check the power supply voltage when the maximum current is flowing and the battery voltage has dropped significantly. For example, in a camera with a built-in electric shutter, it is desirable to turn off the shutter and check the voltage of the battery while current flows through the electromagnet that holds the shutter in the open position lIi. However, this condition is difficult to detect because it lasts for a very short time.

Therefore, in order to create the same mt as this, it is common practice to create a pseudo Sat using a fixed resistor, etc., and only when the battery check button is pressed, this pseudo jiL# is applied to the battery in mW, and the battery is checked in that state. ing. However, in such a system, the check function does not work unless the button is pressed, and there is a risk that the device may be used for t-tc without knowing even if the battery runs out. The present invention is a display cluster that is capable of taking two display states, a colored state and a decolored state, and has a property of retaining the previous state by leaving the connection terminal open, that is, a display collection that has a memory property. It is used for the display of the battery check device, and by making good use of the seven properties, the above drawbacks can be improved, and there is no danger of forgetting to check with a reliable quantity rate.
The purpose is to provide a highly reliable battery check device.

FIG. 1 shows a first embodiment of the present invention. Transistor QI
QW Qa Qa Qs and the resistor @ R9 form a comparison detection circuit, and the voltage 1 of the power supply battery E is connected to the resistor R1, R
Voltage Vl divided by 2 and fixed resistance 1! Compare Rs with the reference voltage vl created by the Zener diode Dl, and if vl is greater than vl, false is OFF, and conversely V
, is higher than Vl, Q6 is configured to become an image. Electrochromic element K is installed in the collector of Q6.
(3Ll is connected, which is Q.

When the switch is open, it is colored, and when the switch 9Wl is set to l, it is discolored.
When both are OFF, the previous state mt is maintained. The power supply I'IILE is connected to the circuit L of the device (in the case of a camera, a photometry circuit, an electric shutter drive circuit, etc.) is connected to the power supply I'IILE via a power switch SW2.

FIG. 2 shows the structure tW of the battery case housing the battery Ef and the switch sw1 of this embodiment. The battery aE is stored in the battery case body 101 as shown in the figure.
02 The terminal 102 is made of gold and also serves as a negative contact point, and is grounded to the 1υ6 of the device. II! , 1tiL's Gofus Gokujo ILI4
As in (a), in the case of zuho, which is stored in a turtle, there is 1
05, and comes into contact with the contact piece 105 when the vc111 pond is removed, as shown in Figure (D).

tA piece 105 is transistor Q6 v) collector and 14
cDO71f m1lli connected to m child,
These switches 104 and 105 constitute a switch SW5.

The operation of this embodiment will be briefly described. Place the electricity into the battery case.
, when the Shin 6 is activated, the voltage ratio of the power supply battery decreases only when a large current flows intermittently, as shown in Figure 6, and the voltage decreases as time passes and the battery wears out. comes F.

However, while the battery voltage (■) is fluctuating within a range exceeding a certain value vIJ1 determined by the relationship between the reference voltage (■2) and the resistance values of RI and R2, Qs is OFF because Vl > Vl.
Therefore, ROD is 11 which has been erased. Now, the battery is depleted and the battery voltage is lower than VO at tll.
If this is the case, then Vl<Vl will hold for only that short period of time, and Qs will be ON. Then, charge is injected into ROD and EOD changes color to 7. The current consumption returned to normal, and the battery voltage V decreased to IgI, but due to the memory nature of the MOD, the coloring remained and it was time to replace the battery (it was time to charge it). To display. In addition, if the battery voltage continues to drop without changing,
Before applying the voltage that fades the skin color of IEcD, the trans/meta D5 is turned OFF and the row color gallery is waxed.

When the used battery is removed in order to replace the battery, Figure 2 (D) (7) When the switch is closed,
ol+ is shorted and disappears. The capacitor C1 is inserted as a companion to prevent the circuit from malfunctioning due to external noise or the like.

In this configuration, depending on the voltage of the battery, an excessive voltage is applied to the EfED, which may destroy the EODl or shorten its operating life, but the examples shown in Figures 4 and 1g5 are improved versions of this. be. In Figure 4, it is a voltage divider circuit using resistor -1, and in Figure 5, the emitter of transistor Qi is biased by Zener diode D2 and resistor R-, and the voltage applied to kOD when Qi is turned on. wt++at.

ing. The previous Ii 7III? In 11, the battery consumption was indicated by coloring the i kcD, but on the other hand, by decoloring the EOD, which is normally colored, it is possible to show that the battery is depleted in 1. can. Its 9'1lt-X is shown in Figure 6.

-'' In the figure, the SW inserted between the power supply battery and the powered circuit (comparison detection circuit/ROD -1gl path L) is used to perform operations for supplying power to the circuit (for example, when the circuit is used for camera measurement). If it is a JJT circuit, it is a switch configured in conjunction with a half-press of the release button. The time constant circuit consisting of resistor Aki and capacitor c2 is a switch 8W.
3, the P-channel FETQatG' is turned on for a certain period of time after closing, and the EOD t-color is applied. This colored state is maintained by the memory property even if the switch sw3 is opened. When the battery voltage becomes lower than the reference value, the transistor Q5 is turned on, so that the ECD is decolored, and the decolored state is maintained even if the switch 8Wj is opened.

Figures 7 and 8 show examples in which this more advanced EOD display section is mounted on the camera's nameplate.

In Figure 7, white reflection on the camera body 201 @ 202
ROD 203 ti! In front of the number 7, there is a name plate 20Ai with a transparent part in the shape of a letter. If the body is black, use j! As shown in Fig. 41, the EGD 703 is decolored in the closed state, so the white reflector 202 is observed through the transparent part of the black name plate 204, and the letters are embedded in white. When the battery is exhausted and 205 becomes colored, the letters are no longer printed and act as a warning.

In the case of a white body, on the other hand, if the structure shown in FIG. 6 is adopted, the characters will be visible when the color is colored, but the characters will not be visible when the color is erased.

In the example of FIG. 8, instead of providing a transparent part in the shape of a letter on the name plate 204, it is only an outer frame 204,
Letters are formed on ROD 203' by patterning.

As explained above, according to the present invention, when the battery voltage falls below the reference value F, even if it is only for a short time, a p indication to that effect is maintained, so that a reliable battery check can be carried out. .

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the Wi1 example of the present invention, Fig. 2 is a cross-sectional view showing the battery case part of the same embodiment, and the sixth factor is a graph showing the effects of fluctuations in battery voltage. - Figures 5 and mb are circuit diagrams showing different embodiments, and Figures 7 and 8 are perspective views showing embodiments of the display section, respectively. Deunehito Nippon Kogaku Kogyo Co., Ltd. Agent Ryobe Ron Male 1st figure 3rd figure 4th figure 5th figure

Claims (3)

[Claims] (1) A pantry check device that includes a detection circuit that detects whether the terminal voltage of the power source fILa exceeds a predetermined reference value and an indicator that changes the display state depending on the output of the detection circuit. 2, it is possible to change from one display state to the other shallow water display state by applying a voltage to the electrode or placing it in a short-circuit state, and both electrodes are in the open state Ic [[<Immediately before the The detection circuit has a memory characteristic tV such that the display state 11tl- is maintained, and when the terminal voltage of the battery is greater than the reference value, the inner electrode of the display system is in the display state 11tl-11tl. Place it in the fully open state and maintain it in the display state,
When the terminal voltage of the battery is lower than the first voltage reference value, both electrodes of the display element are placed in a voltage applied state or a short-circuited state to immediately change the display state to the other display state.
! A battery check device that detects f symptoms. (2) A patent characterized in that when the power supply battery is replaced, both electrodes of the display element are placed in a voltage applied state or short-circuited state, so that the shallow water sweets are changed to a display state of 10,000. - Range of failure The battery check device according to item 1. (3) Is the display element an electrochromic display element? The battery check device according to the first or second item range of %ll1l button as ll-value.