JPS6239306Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is particularly applicable to temperature detectors that completely isolate the heat-sensitive resistor part from the atmosphere being measured, and that require high reliability and high responsiveness. The purpose of this is to provide products that are inexpensive and can be mass-produced.

Conventionally, a temperature sensor for this purpose has a bead-type thermistor 1 inserted into a glass tube 2, as shown in FIG.
The thermistor at its tip is inserted into a thermostat, the glass at the tip of the thermistor is melted, and the glass is sealed, which is used for some industrial measurements. However, it has the following drawbacks.

The entire manufacturing process of this temperature sensor involves craftsmanship similar to glasswork, making it unsuitable for rapid mass production of uniform shapes, and moreover, it is expensive.

Since the size of the glass melting portion tends to be non-uniform, variations occur in thermal response when used as a temperature detector.

Due to these drawbacks, it is currently not versatile.

Therefore, the present invention has a heat-sensitive element in which a pair of electrodes and a heat-sensitive resistive film located between the electrodes are formed on one side of an insulating substrate, and the electrodes and the heat-sensitive resistive film are coated with a protective coating, and the tip is formed in a concave shape. A part of the insulating substrate is inserted into the recess, and the lead wires extending from the pair of electrodes are drawn out through the internal passage of the two-hole ceramic tube, and a resin or glass is inserted into the recess. etc., and adhesively fixes the insulating substrate and the two-hole ceramic tube to create a structure that can be mass-produced at low cost.An embodiment of the present invention will be described below based on FIGS. 2 to 5. I will explain.

FIG. 2 shows a cross-sectional view of the heat-sensitive element. This heat-sensitive element 3 has a pair of metal electrodes 5 formed on one side of an insulating substrate 4 made of ceramic or the like by printing, baking, vapor deposition, sputtering, etc.
A heat-sensitive resistive film 6 such as a thermistor film or platinum resistive film is placed in between.
is formed, a lead wire 7 is electrically connected and fixed to the electrode 5, and the electrode 5 and the heat-sensitive resistive film 6 are further coated with a protective coating 8 of glass, resin, or the like. Then, as shown in FIG. 8, the lead wire 7 of the heat-sensitive element 3 is inserted into the inner passage 10 of the two-hole ceramic tube 9, which has a concave tip.
After inserting from the side end so that the connection part between the electrode 5 and the lead wire 7 is located in the recessed part 11 as shown in FIG. This is a temperature sensor with a structure in which it is injected, dried or baked, and then fixed with adhesive.

With this configuration, the shape and dimensions of the thermal element 3 are mostly determined by the precision of cutting or shaping the insulating substrate, so it is easy to manufacture a very uniform one, and the variation in thermal response is also very small. Also, since the thermal element 3 is formed by forming a thick or thin temperature-sensitive resistive film on the insulating substrate 4, it is easy to manufacture a very small one with a small heat capacity and excellent thermal response. Furthermore, the thermal element 3 and the ceramic tube 9
The thermal element 3 is fixed at the position of the recessed portion 11.
In addition, it is suitable for mass production because no unnecessary load is applied to the joint of the lead wire 7. The thermal resistance film 6, the electrode 5 surface, the connection part of the lead wire 7, etc. are all protected by resin or glass, etc., so they are completely isolated from the outside air, resulting in a highly reliable product.

As explained above, according to the temperature sensor of the present invention, the electrodes of the heat-sensitive element and the heat-sensitive resistive film are coated with a protective coating, so that it can withstand the working atmosphere of various applications and can also be mechanized for general processing work. It can be quickly and easily mass-produced in a predetermined shape, has excellent thermal response, and can be provided at low cost and with an excellent uniform shape.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional temperature sensor, Figure 2~
FIG. 5 shows an embodiment of the temperature detector of the present invention,
FIG. 2 is a sectional view of the heat-sensitive element, FIG. 3 is a sectional view of a ceramic two-hole tube, FIG. 4 is an assembled sectional view of the temperature detector, and FIG. 5 is an external perspective view of the temperature detector. 3... Heat sensitive element, 4... Insulating substrate, 5... Electrode, 6... Heat sensitive resistive film, 7... Lead wire, 8...
Protective coating, 9...2-hole ceramic tube, 1
1... Concave portion.

Claims (1)

[Scope of utility model registration request] A heat-sensitive element comprising a pair of electrodes and a heat-sensitive resistive film located between the electrodes formed on one side of an insulating substrate, and the electrodes and the heat-sensitive resistive film are coated with a protective coating, and a two-hole ceramic tube having a concave tip. a part of the insulating substrate is inserted into the recessed part, a lead wire extending from the pair of electrodes is drawn out through an internal passage of a two-hole ceramic tube, and a resin, glass, etc. is injected into the recessed part. A temperature sensor in which the insulating substrate and the two-hole ceramic tube are bonded and fixed.