JPH0611351U - Electronic parts - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide an electronic component whose operating temperature can be easily identified visually so that the operating temperature is not exceeded. [Structure] In electronic components where the body of the component used below the service temperature is packaged with resin by molding, the resin layer of the package is formed of a light color or transparent that allows color identification of the component body and is formed from a temperature indicating material. It is characterized in that it is provided with a sign.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic component such as a transistor, a resistor, a capacitor, or an inductor, which displays in color a color indicating that a component body of the electronic component has reached a dangerous temperature. The present invention relates to an electronic component that changes its color when the temperature reaches a dangerous temperature so that the temperature can be recognized.

[0002]

[Prior art]

 Generally, in electronic parts, heat generation or maximum service temperature is a problem in use, and the life and reliability of parts may be determined by the history temperature. On the other hand, the service temperature of electronic parts is stated in the specifications, etc., and the product name, part number, and characteristic rank are set so that parts suitable for the application can be easily selected visually on the surface of the exterior part of the electronic part body or case. It is displayed together with the identification mark such as. For example, as shown in FIG. 3, the electronic component 1 is a high frequency NPN type silicon transistor (electronic component), and the terminal 3 connected to the base, collector and emitter from the bottom of the main body 2 which is covered with resin by molding. , 4, 5 are provided to extend downward to the outside, respectively, and the material, polarity, etc. are printed and displayed as the identification mark 6 on the surface of the resin layer on the side surface of the main body 2 by combining alphabetic characters and numbers. When a transistor, which is an example of an electronic component, is operated, Joule heat is generated at the junction due to power loss (collector loss). If the temperature of the junction becomes too high due to this Joule heat, the characteristics of the transistor will change and will not return to the original characteristics. The maximum limit temperature is said to be 80 to 90 ° C. for germanium transistors and about 150 to 180 ° C. for silicon transistors. However, since the current temperature of the transistor cannot be visually recognized, the surface temperature is measured with a thermotracer or thermocouple, and the internal temperature is estimated from the measured value.

[0003]

[Problems to be solved by the device]

 In the above conventional electronic parts, it is not easy to know the temperature at the time of use, and it has not been possible to visually tell the designer and the user whether or not the temperature is being used in an appropriate temperature state. Therefore, even if a defect caused by an electronic component occurs, it is not easy to find the cause, whether it is damaged due to use under abnormal temperature conditions, or damaged due to other causes. In many cases, it was not easy to judge. In addition, there was no method to distinguish the past maximum temperature or the current dangerous temperature of electronic parts by color change.

The present invention has been made in view of the above conventional circumstances, and provides an electronic component in which the operating temperature can be easily visually identified so that the operating temperature is not exceeded. Is intended.

[0005]

[Means for Solving the Problems]

 The electronic component according to the present invention is an electronic component in which the component body to be used at a service temperature or less is packaged with resin by molding, and the resin layer of the package is formed in a light color or transparent that allows color discrimination of the component body. In addition, it is characterized in that a sign formed from a temperature indicating material is provided. As the indicator formed from the temperature indicating material in the present invention, a thermo color of a color-changing pigment that changes its color when the temperature changes can be formed on the entire surface of the resin layer of the exterior, or a predetermined shape can be formed on a visible portion. Or a thermo label, a temperature indicator tape, a temperature indicator crayon or the like is attached to the component body or provided in the resin layer. The temperature indicating material may be a reversible material that changes and returns to its original state when the temperature decreases, or an irreversible material that does not return from the color of the temperature once the maximum temperature is reached, or both. It may have a property. However, if the electronic components are destroyed when the temperature reaches the limit temperature, they may be irreversible.

[0006]

[Action]

 According to the electronic component in which the component body according to the present invention is packaged with resin by molding, the resin layer of the package is formed in a light color or transparent for color identification, and the temperature indicating material is provided in the component body or the resin layer of the external packaging. The sign formed from is formed integrally with the resin layer. According to the electronic component provided with the indicator of the temperature indicating material as described above, it is possible to visually determine at first glance the temperature state, its current operating temperature, or the past maximum operating temperature. Moreover, according to the present invention, since the indicator of the temperature-indicating material is provided in the vicinity of the component body or on the resin layer that is covered with resin, the heat insulating layer for gas is more effective than when the case is sealed and covered. Since it does not intervene, it can be sensitive to the temperature of the component body, and errors are unlikely to occur.

[0007]

【Example】

 Embodiments of the present invention will be described below. FIG. 1 is a diagram for explaining one embodiment of an electronic component according to the present invention. In this embodiment, the case of application to a high frequency NPN type silicon transistor will be described as an example. In the figure, 1 is a high frequency NPN type silicon transistor (electronic component). This transistor 1 is a terminal 3, 4, 5 connected to a base, a collector and an emitter from the bottom of a main body 2 which is covered with resin by molding. Are provided to extend downward to the outside, respectively, and the material, polarity, etc. are printed and displayed as the identification mark 6 on the surface of the resin layer on the side surface of the main body 2 by combining the letters and numbers. It is constructed by providing a sign 7 for the thermo color. For this molding, a resin that forms a light-colored or transparent outer casing that can be used for color identification is used, and the indicator 7 of the temperature-indicating material is molded by mixing a pigment (temperature-indicating pigment) made of a temperature-indicating material with the resin and molding. It is integrally formed on the entire surface of the main body. As described above, according to the present embodiment, the indicator 7 is provided on the entire surface of the main body by mixing the thermochromic pigment in the outer resin layer of the main body of the transistor 1, so that when the temperature of the transistor 1 changes, the component The sign 7 that is in contact with or near the main body is discolored, the temperature is displayed in color, and it is possible to see at a glance by color whether the usage condition is appropriate. Therefore, it is not necessary to calculate the service temperature, and the design time can be shortened and mistakes can be prevented. In this case, by using an irreversible temperature-indicating material, it is possible to judge at a glance whether or not the maximum temperature has been reached in the past.

FIG. 2 is a diagram showing an example of another type of marking. In molding, a resin that forms a light-colored or transparent outer packaging that allows color discrimination is used, and the periphery of the main body 2 is covered with this resin. The resin is externally molded by molding, and the head of the main body 2 is provided as a marker 8 by forming a layer by mixing a thermochromic pigment and an external resin. As described above, according to this embodiment, since the indicator 8 of the temperature indicating material is provided in the exterior resin in contact with the main body of the transistor 1 or in the layer of the exterior resin, when the temperature of the transistor 1 changes, the exterior resin The temperature of the indicator 8 of the temperature-indicating material changes due to heat being transferred to the indicator 8 and the color of the indicator 8 changes to that temperature. Therefore, since it is not necessary to calculate the operating temperature, it is possible to shorten the design time and prevent mistakes.

In addition, in the above-mentioned embodiment, an example was described in which a temperature-indicating pigment was mixed with the resin layer of the exterior as a marker of the temperature-indicating material, but it may be formed from a temperature-indicating label, a temperature-indicating tape, a temperature-indicating crayon, or the like. Further, the example of the transistor has been described as the electronic component, but the invention is also applied to a resistor, a capacitor, an inductor, or other electronic components that generate heat or whose performance changes due to temperature change.

[Effect of device]

 As described above, according to the electronic component of the present invention, since the marking made of the temperature indicating material is provided on the exterior resin, when the temperature of the electronic component changes, the color of the marker changes depending on the temperature, and whether the usage condition is proper or not. You can tell at a glance by the color. Therefore, it is not necessary to calculate the operating temperature, which shortens the design time and prevents mistakes. In this case, if an irreversible temperature indicating material is used, it can be determined at a glance whether or not the maximum temperature has been reached in the past.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an embodiment of an electronic component according to the present invention.

FIG. 2 is a perspective view for explaining another embodiment of the electronic component according to the present invention.

FIG. 3 is a perspective view showing a conventional electronic component.

[Explanation of symbols]

 1 Electronic parts 7,8 Marking of temperature-indicating material

Claims (1)

[Scope of utility model registration request] 1. In an electronic component in which a component body used at a service temperature or below is packaged with a resin by molding, the resin layer of the package is formed in a light color or transparent so that the color of the component body can be distinguished, and the resin is also used. An electronic component having a layer provided with a sign formed of a temperature indicating material.