JPH0815658A - Electronic parts provided with temp. history display function - Google Patents

Abstract

PURPOSE:To easily suspect the fact that electronic parts are preserved or used under an improper temp. condition by applying thermo paint irreversibly discoloring at a temp. exceeding a prescribed allowable temp. range to the electronic parts. CONSTITUTION:A liquid crystal display element (electronic parts) A has the side surface part of the transparent substrate 1 on the surface side with the lot number 3 of the liquid crystal display element A displayed by the thermo paint 2. The temp. at which the thermo paint 2 discolors is set to a temp. lower than the highest limit of the allowable temp. range suitable for the preservation or the use of the liquid crystal display element A by <=10 deg.C. The discoloration of the temp. indication paint 2 is caused irreversibly, and the color is never restored to the origin after the color is discolored once. Thus, by confirming whether or not the thermo paint discolors, whether or not the liquid crystal display element A is preserved or used under the improper temp. condition is properly distinguished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component, such as a liquid crystal display device, which is required to be stored and used within a certain temperature range. The present invention relates to an electronic component having a temperature history display function capable of appropriately determining whether or not it has been placed under conditions.

[0002]

2. Description of the Related Art For example, a general liquid crystal display device needs to be stored and used in a constant temperature range of about -25 ° C to 80 ° C. If the liquid crystal display element is placed outside these temperature ranges,
For example, under high temperature conditions, changes in the alignment state of liquid crystal molecules,
Deterioration of the polarizing plate, adhesion deterioration of the liquid crystal seal part, etc.
As a result, the quality of the liquid crystal display element is impaired and the service life thereof is shortened.

Therefore, electronic parts such as liquid crystal display elements are required to be constructed so that it can be easily discriminated whether or not they have been stored or used within a certain allowable temperature range. However, in the past, no means has been taken to meet such a request.

Therefore, in the past, due to the fact that electronic components were stored or used under inappropriate temperature conditions,
Even if the quality is deteriorated or a failure occurs, it cannot be easily detected, which causes inconvenience in this respect.

The present invention was devised under such circumstances, and when an electronic component is stored or used under an inappropriate temperature condition, it can be easily detected. Therefore, it is an object to make it convenient for quality control of electronic parts and investigation of the cause of failure.

[0006]

In order to solve the above problems, the present invention takes the following technical means.

That is, according to the invention of claim 1 of the present application, the temperature-indicating paint which irreversibly discolors at a temperature exceeding a predetermined allowable temperature range for properly storing or using the electronic component is the electronic component. It is characterized by being applied to.

According to a second aspect of the present invention, in the electronic component having the temperature history display function of the first aspect, the temperature indicating paint is used for displaying a lot number of the electronic component. I am trying.

According to a third aspect of the invention of the present application, in the electronic component having the temperature history display function of the first or second aspect, the temperature-indicating paint has a temperature higher than a high temperature limit of the allowable temperature range of the electronic component. It is characterized in that it discolors when the temperature rises within the range of ° C.

[0010]

In the invention described in claim 1, the storage temperature or the use temperature of the electronic component is
When the temperature reaches a constant temperature exceeding a predetermined allowable temperature range, the temperature-indicating paint applied to this electronic component irreversibly changes color. Therefore, by checking whether or not the temperature indicating paint is discolored, it is possible to appropriately determine whether or not the electronic component is stored or used under an inappropriate temperature condition.

As a result, the quality control of whether or not the quality of the electronic component is deteriorated due to an abnormal temperature condition can be performed easily, the quality can be confirmed when the user purchases the electronic component, or the electronic component can be broken. When an error occurs, it is possible to accurately check whether or not the cause of the failure is an inappropriate temperature condition.

According to the second aspect of the present invention, since the lot number of the electronic component is displayed with the temperature-indicating paint, if it is confirmed whether or not the lot number is discolored, it is possible to find an inappropriate temperature. Under this condition, it is possible to determine whether or not this electronic component has been stored or used, and it is also possible to perform quality control by the manufacturer or the seller at the same time by this lot number. Therefore, the quality control based on the lot number numbering and the quality control based on the presence or absence of discoloration can be performed together, and the convenience and convenience of managing electronic parts can be obtained.

In the invention according to claim 3 of the present application, the temperature is 1 above the high temperature limit of the predetermined allowable temperature range of the electronic component.
When the temperature rises within the range of 0 ° C, the temperature indicating paint discolors. Therefore, even if the storage temperature or use temperature of the electronic component becomes significantly higher than the high temperature limit of the predetermined allowable temperature range, the color change of the temperature-indicating paint is not solved, and the storage or use temperature of the electronic component is within the allowable temperature range. It is possible to improve the accuracy of the determination of whether or not the value exceeds.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 1 is a perspective view showing a liquid crystal display element A as an example of an electronic component having a temperature history display function according to the present invention. This liquid crystal display element A is most characterized in that the lot number 3 of the liquid crystal display element A is displayed on the side surface of the transparent substrate 1 on the front surface side by the temperature indicating paint 2.

As the temperature-indicating paint 2, for example, a type in which two kinds of reactive substances of different colors are mixed and one of the reactive substances is enclosed in a heat-melting microcapsule is applied. You can In such a temperature-indicating paint 2, when the temperature rises to a predetermined temperature, the microcapsules are melted and two kinds of reactive substances are mixed and react with each other, so that the color changes to a color different from that before the microcapsules are melted To do. As another example of the temperature-indicating paint 2, it is also possible to apply a liquid crystal material such as that used in a thermo label.

The temperature at which the temperature-indicating paint 2 discolors is
For example, when the permissible temperature range suitable for storage or use of the liquid crystal display element A is −25 ° C. to 80 ° C., the range of high temperature within 10 ° C. from the high temperature limit,
That is, for example, it is set to 85 ° C. The color change of the temperature indicating paint 2 is irreversible, and the color does not return to the original color after the color once changes.

The structure of the liquid crystal display device A shown in FIG. 1 other than the above is the same as the conventional one, and liquid crystal is sealed between the transparent substrates 1 and 1a made of glass,
A large number of transparent electrodes 4 are drawn out from these liquid crystal enclosures. Further, on the outer surface side of the transparent substrates 1 and 1a,
A polarizing plate (not shown) is arranged.

In the liquid crystal display element A having the above structure, the liquid crystal display element A is exposed to a temperature condition of, for example, 85 ° C. or higher, and a predetermined allowable temperature range (-25 ° C. to 80 ° C.).
If the condition is exceeded, the color of lot number 3 discolors irreversibly.

Therefore, for example, this liquid crystal display element A
If the manufacturer or seller of the above, when reading the number of the lot number 3 at the time of shipment, at the same time confirms whether or not the lot number 3 is discolored, the liquid crystal display element A is It is possible to easily determine the temperature history of whether or not it has been stored under appropriate temperature conditions. Moreover, a user who purchases this liquid crystal display element A can also be confirmed. If the lot number 3 has already been discolored, it can be found that the liquid crystal display element A was in an inappropriate management state, so that it is possible to prevent bad products from being traded. It will be useful.

In the above embodiment, the temperature-indicating paint 2 discolors only when the liquid crystal display element A has a temperature higher than a predetermined allowable temperature range. Alternatively, instead of such a configuration, the temperature indicating paint 2 may be configured to change color when the temperature falls below the allowable temperature range.

Further, in the above embodiment, since the lot number 3 is displayed using the temperature-indicating paint 2, it is convenient because the temperature history of the liquid crystal display element A can be simultaneously judged when reading the lot number 3. The present invention is not limited to this. For example, as shown in FIG. 2, the temperature-sensitive coating material 2 may be applied to the side surface portion 5 of the liquid crystal display element A so as to make a marking of an appropriate area or shape. In the invention described in claim 1, the specific mode of applying the temperature-indicating paint 2 is not limited, and the application place is not specified.

Further, although the liquid crystal display element has been described as an example of the electronic component in the above embodiment, the present invention is not limited to this. In the present invention, for example, display elements other than liquid crystal display elements and elements for various electronic circuits,
It can be applied to various electronic components in which the storage temperature and the use temperature are limited to a certain temperature range.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an electronic component having a temperature history display function according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the temperature-indicating paint applied to the electronic component.

[Explanation of symbols]

 2 Thermochromic paint 3 Lot number A Liquid crystal display device (electronic parts)

Claims (3)

[Claims] 1. An electronic component is coated with a temperature-indicating paint that irreversibly changes color at a temperature exceeding a predetermined allowable temperature range for proper storage or use of the electronic component. , Electronic components with temperature history display function. 2. The electronic component having a temperature history display function according to claim 1, wherein the temperature-indicating paint is used for displaying a lot number of the electronic component. 3. The temperature according to claim 1, wherein the temperature-indicating paint changes color when the temperature reaches a high temperature within 10 ° C. of a high temperature limit of an allowable temperature range of the electronic component. An electronic component with a history display function.