JPS61158192A - Flexible circuit board with temperature sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Minute Hand" The present invention relates to a flexible circuit board equipped with a temperature sensor that can be configured to have an arbitrary shape and a thin shape by providing a thermistor on a base member made of a ceramic sheet.

"Prior Art" In a conventional temperature sensor used for temperature measurement, a temperature-sensitive sensor section is housed in a metal case, and the case is brought into contact with an object to be measured. There is a type that can be used for temperature measurement in a state. The temperature sensing sensor section having such a structure is composed of a thermistor having so-called negative resistance characteristics, and its temperature sensing characteristics can be easily adjusted to various values depending on the type of object to be measured. It is widely used in applications such as detecting temperature changes in a measured object with high precision.

"Problems to be Solved by the Invention" A temperature sensor with such a structure is constructed by housing the temperature sensor section in a metal case, so the temperature sensor section can indirectly measure the temperature of the object to be measured. Therefore, there were problems such as deterioration of the detection response characteristics or pulsation of the detected temperature. Furthermore, since the structure is enclosed in a metal case, the external shape is generally large, and there is also the problem that the fit or usability of the device in a narrow area of the limb measurement body is subject to corresponding restrictions.

"Means for Solving the Problems" The present invention is designed to be small and thin so that the inherent characteristics of this type of thermistor can be maximized, and it can be used directly on the object to be measured in a narrow place, for example. The purpose of the present invention is to provide a flexible circuit board equipped with a temperature sensor that can be brought into contact with a temperature sensor to suitably perform a detection operation, and for that purpose,
According to the present invention, a thermistor is printed and fired in an arbitrary shape on a flexible base member made of ceramic paper or a ceramic sheet, and a conductor pattern for a lead to be connected to the thermistor is also appropriately attached to the base member. It is configured to be formed by vapor deposition.

A flexible circuit board equipped with a temperature sensor having such a structure is a direct contact type, and the flexible base member itself has sufficient heat resistance. It can be configured in any shape, and is particularly advantageous in achieving miniaturization and thinning. Furthermore, for temperature detection applications where the object to be measured is a rotating body, a configuration in which a glass material or the like having high abrasion resistance is coated on the thermistor surface can also be adopted.

"Example" FIG. 1 and FIG. 2 show a conceptual plan view and a cross-sectional view of the main part of a flexible circuit board equipped with a temperature sensor according to an example of the present invention, In both figures, 1 is a base member, 2 is a thermistor, 3 is a lead conductor pattern for the thermistor 2, and 4 is a part designed for applications where the temperature of a rotating object to be measured, etc. is directly detected in a contact state. indicates, for example, a glass material on the thermistor 2 to be obtained. The base member 1 is made of a flexible and heat-resistant member such as ceramic paper or a ceramic sheet, and a thermistor 2 of an appropriate shape is formed on the base member 1 by printing and firing means. It is. This thermistor 2
can be constructed by mixing a suitable binder etc. into a material belonging to a type of so-called semiconductor thermistor so as to have temperature characteristics and heat resistance 6 mechanical characteristics optimal for detecting the temperature of the object to be measured. In particular, it is possible to form it finely and thinly. The lead conductor pattern 3 for outputting the detection action of the thermistor 2 is formed by depositing a conductive material such as copper or nickel on the base member 1, and preferably has environmental resistance such as corrosion resistance. However, this is not the case if the conductor pattern 3 is formed of a material with good corrosion resistance by direct vapor deposition.

Such a structure is used for temperature sensing operation by bringing the thermistor 2 into direct contact with the object to be measured, and is miniaturized.

The main feature is that it is possible to achieve high responsiveness in temperature detection along with the thinness. On the other hand, if the thermistor 2 has a structure in which a wear-resistant member such as a glass material 4 is provided on the surface of the thermistor 2, it is possible to stably and continuously perform temperature detection operation while in contact with various heating rollers, etc. Since the entire structure is flexible, it has the advantage of facilitating suitable installation for temperature measurement even in narrow and complicated spaces. ``Effects of the Invention'' As is clear from the above explanation, A flexible circuit board equipped with a temperature sensor according to the present invention is constructed by appropriately printing and firing a thermistor on a highly heat-resistant flexible base member, and also forming a lead conductor pattern for the thermistor by vapor deposition. Therefore, it has the advantage that it can be widely applied to temperature sensors in various fields as a direct contact type temperature detection means for a measured object.

In addition, the entire device can be easily configured to be as small and thin as possible, and combined with its flexibility, it has the advantage of being highly easy to mount as a temperature sensing element in a narrow space. It has an optimal structure as a compact, high-precision temperature detection means for various modern devices.

[Brief explanation of drawings]

FIG. 1 is a conceptual plan view of essential parts of a flexible circuit board equipped with a temperature sensor configured according to an embodiment of the present invention, and FIG. 2 shows a thermistor surface subjected to wear-resistant treatment. FIG. 3 is a similar cross-sectional configuration diagram of a main part in a case where it is configured to be applied. 1: Heat-resistant base member 2: Thermistor 3: Lead conductor pattern 4: Glass Material quantity requester: Nippon Mectron Co., Ltd. 7#, 1 Figure 2

Claims (1)

[Scope of Claims] A temperature sensor comprising a thermistor formed by printing and firing on a base member made of a ceramic sheet, and a conductor pattern for a lead for the thermistor is formed by vapor deposition. flexible circuit board.