JPH0628712Y2 - Voltage measurement sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a seat which has a simple structure and can be used to measure the voltage of a battery and has no driving part.

(Prior Art) Applications of small batteries, especially dry batteries, are rapidly expanding with the development of various electric and electronic products. For example, portable radios, televisions, cassette decks, tape recorders, clocks and cameras, toys,
There are many products that use batteries as their energy source.
Batteries are usually stored in the product as they are, and because they are used continuously without checking the remaining voltage, they may become inoperable due to insufficient voltage during use, and to avoid this If the battery is replaced every time it is reused, it will be an uneconomical usage that ignores the battery life.

As a device for measuring voltage, a tester is generally used, but since it is too large to frequently measure a 1.5V or 9V dry battery, it is practically not used at all.

The applicant of the present invention first provided a conductive layer and a temperature-sensitive coloration type liquid crystal layer on a support, and made both ends of the conductive layer contact both electrodes of a battery to be measured to generate partial heat generation in the conductive layer. We proposed a voltage measurement sheet that causes this heat to be detected by the temperature-sensitive coloration type liquid crystal layer and causes a color change in this liquid crystal layer at a length corresponding to the voltage.

(Problems to be solved by the invention) However, this voltage measurement sheet is likely to slip because the portion of the voltage measurement sheet that contacts both electrodes of the battery to be measured is the smooth exposed surface of the conductive layer provided on the sheet. There was a flaw. In particular, in the case of a 1.5 V cylindrical dry battery, since the sheet must be bent extremely, the operation for measurement cannot be easily performed.

In view of the above-mentioned drawbacks, the present invention provides a voltage measuring sheet that is easy to handle.

(Means for Solving Problems) A voltage measuring sheet according to the present invention is a voltage measuring sheet having a conductive layer and a temperature sensitive color layer on the surface of a support, and is applied to both electrodes of a battery to be measured. It is characterized in that a through hole penetrating the entire thickness of the sheet is provided adjacent to a part of the exposed portion that becomes a contact point of the conductive layer to be abutted.

The support used in the present invention is polyester, polycarbonate, polysulfone, polyamide, cellulose,
Examples include paper, synthetic paper, and heat-stable polymer sheets, but a thin flexible transparent film is most preferable.

The conductive layer is made of silver, nickel, iron, copper, carbon, lead, etc., either alone or in an appropriate mixture. Most preferably, it is used in the form of a conductive ink, and it is preferably dispersed in an epoxy or urethane resin and provided on a support by printing, coating, transferring or other methods.

The liquid crystal used in the present invention is a temperature sensitive color type liquid crystal having a property of showing a color change in response to a temperature change. Specific examples thereof include cholesteric liquid crystals such as cholesteryl chloride, cholesteryl oleyl carbonate, cholesteryl bromide, cholesteryl acetate, cholesteryl nanonate, cholesteryl oleate, and cholesteryl capryate. It is used as a paint by encapsulating it in a microcapsule or by directly dispersing it in a polymer binder without encapsulation.

(Operation) According to the present invention, a through hole penetrating the entire thickness of the sheet is provided adjacent to a part of the exposed portion that serves as a contact point of the conductive layer. Since it surely touches the electrode of the battery, it is easy to align the contact with the electrode,
Moreover, the contact between the conductive layer and the electrode can be easily achieved and maintained without slipping by simply holding the contact lightly.

(Embodiment) The present invention will be described below according to an embodiment shown in the drawings.

FIG. 1 is a plan view showing the front side of the voltage measurement sheet, and FIG. 2 is a sectional view taken along line II-II of FIG. In the drawing, a temperature-sensitive coloration type liquid crystal layer 1 is provided on the surface of a transparent support 3, while a conductive layer 2 is provided on the back surface. Reference numeral 4 denotes a black layer, which serves as a base of the liquid crystal layer 1 so that the color of the liquid crystal can be clearly seen. Needless to say, it can be provided under the liquid crystal layer 1, and the conductive layer 2 itself or the support 3 Can be omitted if is a dark color such as black. Further, 8 is a voltage scale, which is written based on the relationship between a predetermined voltage and the color length of the liquid crystal layer 1.

The conductive layer 2 has a substantially strip shape, and the central portion 6 has a narrow width,
Also, both ends are terminals 10 for contacting the battery to be measured. At the center of the terminal 10, a through hole 7 penetrating the conductive layer 2, the black layer 4 and the support 3 is provided.
Even when a transparent protective film (not shown) is provided on the conductive layer 2, the terminal portion 10 is exposed for contact with the electrode of the battery, so that the through hole 7 is always the total thickness of the sheet. Will be penetrated.

The shape of the through hole 7 is arbitrary such as a circle, an ellipse, a polygon, and a star, but the entire area of the electrode can be reduced by making it smaller than the area or section of the positive and negative electrodes of the battery or by slightly shifting the position. Try to overlap a part instead of. Further, it is not always necessary that the through hole 7 is surrounded by the terminal 10 as shown in FIG. 1, and the through hole 7 may be protruded from the conductive layer 2 and partially overlap the terminal 10.

In the voltage measuring sheet according to the present invention, the arrangement of the liquid crystal layer 1, the conductive layer 2 and the dark layer 4 on the front and back sides of the support 3 and the stacking order can be variously changed.
If only one side of the transparent support 3 is used,
The liquid crystal layer 1, the dark color layer 4, and the conductive layer 2 are laminated in this order to form a support 3
The change in color of the liquid crystal layer 1 may be observed through. Further, the shape itself of the support 3 can be matched with the pattern of the conductive layer 2.

When using the voltage measurement sheet configured as described above,
When both electrodes are lined up on the same surface like a 9V battery, if the two terminals 10 and 10 of the voltage measurement sheet are applied to both electrodes of the battery, respectively, a part of the fingertip will become an electrode through the through holes 7 and 7. Since it is directly touched, if it is held down lightly, the contact between the terminal and the electrode can be surely made. Also, in the case of a 1.5V battery or a button battery in which both electrodes are located on opposite sides of each other, the sheet is bent in an arc shape with the side of the conductive layer 2 as the inside. Also in this case, the electrodes can be suppressed by a part of the fingertip through the through holes 7, 7.

When a current flows through the conductive layer 2, heat generation starts from the narrowed portion, the heat generation region gradually expands, and finally heat is generated for a certain length according to the residual voltage. This heat is transferred to the liquid crystal layer 1, and the liquid crystal layer 1 is colored in a length equal to the heat generation length of the conductive layer 2. Therefore, the voltage state of the battery can be known by measuring the colored length of the liquid crystal layer 1.

(Effect of the Invention) The present invention is a sheet-like voltage measuring device, which has a very simple structure in which a through hole is provided adjacent to a part of an exposed portion which becomes a contact point of a conductive layer. The measurement operation can be made extremely easy, and its practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a plan view showing a front side of a voltage measuring sheet according to the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 ... Thermosensitive liquid crystal layer, 2 ... Conductive layer, 3 ... Support, 4 ... Black layer, 7 ... Through hole, 8 ... Scale, 10 ...
Terminal.

Claims (1)

[Scope of utility model registration request] 1. A voltage measuring sheet having a conductive layer and a temperature-sensitive coloration type liquid crystal layer on a surface of a support, the conductive layer being exposed as a contact by being brought into contact with both electrodes of a battery to be measured. A through hole that penetrates the entire thickness of the sheet and overlaps only a part of each of the electrodes, and has a size such that a part of a fingertip can touch the electrode through the through hole. A voltage measurement sheet characterized by