JPH01209329A - Glass temperature detector - Google Patents

Abstract

PURPOSE:To rapidly perform high sensitivity detection, by closely bringing one surface of an insulating substrate having temp.-sensitive elements having a high resistance temp. coefficient formed to both surfaces into contact with the surface of glass and exposing the other surface thereof to the open air. CONSTITUTION:Temp.-sensitive resistors 4, 6 having a high resistance temp. coefficient are formed to the front and rear of an insulating substrate 1 and terminals 5, 7 are respectively provided to said resistors. The front 2 of the insulating substrate 1 is closely brought into contact with a glass plate 8 and the rear 3 thereof is exposed to the open air. A bridge circuit is formed of the temp. sensitive resistors 4, 6 and resistors 9, 10 and the output thereof is inputted to an operational amplifier 11 to detect the temp. difference between the open air and the glass plate. As the temp.-sensitive resistor 4 or 5, a membrane type one formed by sintering organonickel paste or organoplatinum paste in air is used. By this method, temp. difference is rapidly detected with high sensitivity. This detector is suitable for preventing the dew condensation of the wind-shield of a car or the window glass of a showcase.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a temperature detection device for detecting the temperature of a glass surface, such as an automobile window glass or an exhibition glass, in order to prevent dew condensation on the glass surface. .

Conventional technology Conventionally, this type of temperature sensing device directly detects the internal temperature of the glass by embedding a temperature sensing element such as a thermistor inside the glass, and has sufficient functionality as a temperature sensor for detecting dew condensation, which requires quick response. It was difficult to figure out.

Problems to be Solved by the Invention In such a conventional configuration, it takes time to detect changes in the glass surface temperature using an embedded thermistor, and the thermal response is poor. Furthermore, since a thermistor, which is a non-linear temperature sensing element, was used, it was necessary to correct the circuit for detection operation.

The present invention solves these problems by directly detecting the temperature of the glass surface, as well as detecting the temperature difference between the glass surface and the outside temperature without being affected by changes in outside temperature. The purpose is to prevent this phenomenon.

Means for Solving the Problem In order to solve this problem, the present invention forms a temperature-sensitive resistor by forming temperature-sensitive elements having a high temperature coefficient on both sides of an insulating substrate such as a ceramic substrate or a transparent glass substrate. One side of the temperature-sensitive resistor is adhered to a glass surface, and the other side is exposed to the outside air.

Function: With this configuration, the correction resistor made of the same temperature-sensitive material for the purpose of correcting the outside air temperature shows a resistance value that follows changes in the outside air temperature, and when the glass surface and the outside air temperature become the same temperature, They show the same amount of change in resistance value. On the other hand, a temperature-sensitive element bonded to the glass surface quickly detects temperature changes directly on the glass surface, and also detects the temperature difference between the glass surface and the outside temperature, which can cause condensation on the glass surface due to a sudden rise in outside temperature. This results in highly responsive detection.

Embodiment FIGS. 1 and 2 are block diagrams of the front and back surfaces of a glass temperature sensing element corrected for outside air temperature according to an embodiment of the present invention.

A temperature sensitive film made of thin film of nickel or platinum is produced by sintering a nickel organometallic paste in air at 650°C on the surface 2 of an insulating substrate 10 such as a ceramic, or by sintering a platinum organometallic paste at 860°C in air. Take out the resistor 4 and electrode 6
It is formed together with On the other hand, on the back surface 3 of the insulating substrate 1, a temperature-correcting temperature-sensitive resistor 6 made of the same material as the temperature-sensitive resistor 4 is formed together with an extraction electrode 7. The temperature-sensitive resistor 4.6 formed on the front and back surfaces of the insulating substrate 1 is adhered to the surface of the glass plate 8 with the temperature-sensitive resistor 4 facing the glass plate 8, and the glass surface temperature is is detected by the temperature sensitive resistor 4, and the outside temperature is detected by the temperature sensitive resistor 6.

This situation is shown in FIG.

FIG. 4 is a circuit diagram of a detection device composed of these temperature-sensitive resistors and external circuit components. The temperature difference between the glass surface and the outside air temperature can be extracted as a differential output voltage of a bridge circuit consisting of a temperature sensitive resistor 4.6 and a resistor S, 10, and the outside air temperature and the glass surface show the same temperature. At this time, the bridge circuit is balanced with a semi-fixed resistor 9.10, so no output voltage appears. 1
Reference numeral 1 denotes an operational amplifier, which together with resistors 12 to 15 constitutes a differential amplifier circuit.

Effects of the Invention As described above, according to the present invention, the glass surface temperature and the outside air temperature can be directly and quickly detected using dedicated temperature-sensitive resistors, and temperature correction is automatically performed in accordance with changes in the outside temperature. It can quickly detect the difference in temperature between the air temperature and the glass surface. Furthermore, by using both temperature-sensitive resistors that have large resistance temperature coefficients and excellent linearity,
Effects such as the ability to easily configure an external detection circuit can be obtained.

Further, as shown in the examples, a thin film temperature-sensitive resistor can be constructed by thermal sintering of an organic metal paste, which has advantages such as high sensitivity.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the front and back surfaces of an element of a glass temperature detection device according to an embodiment of the present invention, and FIG.
The figure is a sectional view showing the element adhered to the glass surface, and FIG. 4 is a circuit diagram of the detection device according to the present invention. 1... Insulating substrate, 4.6... Temperature sensitive resistor,
5゜7...Takeout electrode, 8...Glass plate. No --- Re 5 bih castle 1 (flexibility?- entry surface 3-

Claims (2)

[Claims] (1) Temperature-sensitive elements with a high temperature coefficient of resistance are formed on both sides of an insulating substrate to form a temperature-sensitive resistor, and one side of the temperature-sensitive resistor is adhered to the glass surface where the temperature is to be detected. A glass temperature sensing device that exposes the other side of the body to the outside air for temperature compensation. (2) The glass temperature sensing device according to claim 1, wherein the temperature sensing element of the temperature sensing resistor is formed by sintering printable nickel organic metal paste or platinum organic metal paste in air.