JP2002267539A - Light transmission body temperature sensor and device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measuring device capable of accurately measuring a light transmission body such as a lens. SOLUTION: A sensor part 21 is provided with a light shielding member 4, thereby preventing light from irradiating the sensor part 21. A heat insulating member 3 is filled between the light shielding member 4 and a thermocouple 2, thereby preventing conduction heat generated in the light shielding member 4 from transferring to the thermocouple 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measurement of a surface temperature of a light transmitting body such as a lens or glass used in a projector.

[0002]

2. Description of the Related Art Conventionally, when measuring a chip temperature inside an electronic device, a thermocouple is brought into contact with an object to be measured, and an electromotive force corresponding to the temperature of the object to be measured is generated in a thermocouple sensor section.
Means for measuring the temperature of the device under test from the generated electromotive force is generally used. This method is a contact type measurement because a thermocouple as a sensor is brought into contact with an object to be measured.

On the other hand, a thermography apparatus that measures the temperature distribution of an object by reading the intensity of infrared rays emitted from the object with a special camera is, for example, a temperature distribution on a substrate,
It is widely used for measuring indoor temperature distribution and temperature distribution on the human body surface. This method is a non-contact type measuring device because a sensor (camera) is not in contact with an object to be measured.

[0004]

In the above-mentioned method generally used for temperature measurement, the temperature of a light transmitting body which receives light like a lens and absorbs only infrared rays to increase the temperature is measured. Can not. For example, when a thermocouple is brought into contact with the lens surface using a conventional thermocouple method, light is irradiated not only on the lens but also on the sensor portion of the thermocouple. Since the infrared absorption rate of the thermocouple is higher than that of a transparent body such as a lens, the temperature of the thermocouple is higher than that of the lens. For example, when the sensor part of the thermocouple is black, it absorbs infrared energy and raises the temperature, whereas the lens or glass absorbs only a part of infrared light and transmits or reflects other energy. Therefore, the temperature of the thermocouple sensor becomes higher than the temperature of the lens, and the temperature indicated by the thermocouple measuring device is not the temperature of the lens but the temperature of the thermocouple. In addition, it is impossible in principle to measure the temperature of the transparent body with a non-contact temperature measuring device such as a thermography. Further, in the case of thermography, since the size of the apparatus is increased, it is not suitable to incorporate the inside of the apparatus and perform temperature measurement.

[0005] For this reason, strong light such as a lens for a projector incorporated in the device is irradiated,
There is a strong demand for the development of a compact temperature sensor and device that can accurately measure the temperature of a light transmitting body that absorbs a portion of infrared energy and reflects or transmits other energy such as visible light. .

An object of the present invention is to provide a temperature measuring device capable of accurately and easily measuring the temperature of a light transmitting body such as a lens used for a projector device or the like.

[0007]

The light transmitting body temperature sensor according to the present invention has a sensor section, an electromotive force generating means for generating an electromotive force in accordance with the temperature of the sensor section, and the sensor section having a sensor to be measured. And a heat insulating means for covering the sensor while exposing it to a position where it can come into contact with the light transmitting body, and preventing conduction heat generated by light irradiation from being conducted to the sensor unit.

[0008] The electromotive force generating means is a thermocouple.

[0009] A light beam incidence preventing means is provided on the heat insulating means so as not to hinder the exposure of the sensor part, and prevents light emitted from one direction from directly entering the sensor part.

[0010] The light beam incidence preventing means is provided on at least a part of the surface of the heat insulating means.

The light beam incidence preventing means includes a light blocking means for blocking light. The light beam incidence preventing means includes a light reflecting means for reflecting light.
The light reflecting means is a mirror or a glossy light reflecting surface.

The light reflecting means is an infrared reflecting layer for reflecting infrared light. The light transmitting body temperature measuring device of the present invention includes a transmitting body temperature sensor of the present invention, temperature detecting means for detecting a temperature from an electromotive force generated in the light transmitting body temperature sensor, and a temperature detected by the temperature detecting means. And a temperature display means for displaying

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a light transmitting body measuring sensor according to an embodiment of the present invention. In FIG. 1, the light transmitting body temperature measuring sensor 10 of the present invention includes a sensor section 21 and a sensor protecting section 22.

The sensor section 21 comprises a thermocouple 2 in the present embodiment. The thermocouple 2 is an element that detects the temperature of the surface of the lens 1. The thermocouple 2 has a temperature measurement sensor section 2 a that comes into contact with the lens 1. Thermocouple 2
An electromotive force corresponding to the temperature of the temperature sensor 2a is generated.

The sensor protection section 22 includes a heat insulating member 3, a light shielding member 4, and an infrared reflective paint layer 5. Here, it is assumed that the measured object is on the left side of FIG.
The sensor protection unit 22 is arranged so that the temperature measurement sensor unit 2a can contact the measured object on the left side of FIG.

The heat insulating member 3 is provided so as to cover the periphery of the thermocouple 2 and is a member for preventing heat from other than the lens 1 from being conducted to the thermocouple 2. Further, the heat insulating member 3 covers the thermocouple 2 such that at least a part of the temperature measurement sensor section 2a is exposed on the surface of the heat insulating member 3.

The light shielding member 4 is provided so as to cover at least a part of the surface of the heat insulating member 3 and prevents the thermocouple 2 from being irradiated with the light flux 9. The infrared reflective paint layer 5 is provided so as to cover at least a part of the surface of the light shielding member 4 and reflects infrared light in order to prevent the thermocouple 2 from being irradiated with infrared light in the light flux.

FIG. 2 shows a light transmitting body measuring sensor 1 of the present invention.
1 shows a light transmitting body measuring apparatus 20 using a reference numeral 0. The light transmitting body temperature measuring device 20 includes a light transmitting body measuring sensor 10 and a temperature detecting unit 30. Reference numeral 1 denotes a lens whose temperature is to be measured. Reference numeral 8 denotes an arrow indicating heat transfer to the thermocouple 2, and reference numeral 9 denotes an arrow indicating a light beam irradiated from one direction. The light beam 9 is emitted from the light source (not shown) to the lens 1 in one direction, and in FIG.

The temperature detector 30 further includes an electromotive force detector 3
1 and a temperature display section 32. In addition, 6 is a lead wire connecting between the thermocouple 2 and the temperature detecting unit 30.

The electromotive force detecting section 31 is a circuit for detecting the electromotive force generated by the light transmitting body measuring sensor 10 and converting it into the temperature of the lens 1. The temperature display section 32 is detected by the electromotive force detecting section 31. And a display device for displaying a temperature based on the generated electromotive force.

As shown in FIG. 2, the light transmitting body temperature measuring device 10 having the above-described structure brings the temperature measuring sensor 2a of the thermocouple 2 into contact with the lens 1 to which the light beam 9 has been irradiated.
The temperature of the lens 1 is measured.

When the light beam 9 is irradiated on the lens 1, the light beam 9
Is transmitted through the lens 1 or reflected by the lens 1 except for a part of the included infrared rays. Another part of the infrared light that is not transmitted or reflected is absorbed by the lens 1 and converted into thermal energy.

The light beam 9 is also radiated to the light transmitting body measuring sensor 10 together with the lens 1. A part of the light beam 9 applied to the light transmitting body measurement sensor 10 is reflected by the infrared reflective paint layer 5. Further, the light beam 9 excluding the reflected part is absorbed by the blocking member 4. Therefore, it is possible to prevent the luminous flux 9 from being directly irradiated on the thermocouple 2.

The light beam 9 absorbed by the blocking member 4 is
It becomes heat energy and raises the temperature of the light shielding member 4 to a high temperature. The heat generated at this time is cut off by the heat insulating member 3. Therefore, it is possible to prevent conduction heat conducted from other than the lens 1 to the thermocouple 9. Note that the light transmitting body measurement sensor 10
The light flux 9 is not irradiated on the surface of the lens 1 contacted with the light. However, as indicated by the arrow 8, the thermal energy generated in the lens 1 is transmitted from the periphery of the surface of the lens 1 with which the light transmitting body measurement sensor 10 contacts, so that the temperature of the lens 1 can be measured. .

As described above, the light transmitting body measuring sensor 10 of the present invention is provided with the infrared reflecting member 5 and the light shielding member 4 so as to cover the periphery of the thermocouple 2, so that the electromotive force generating section 20 is irradiated. The luminous flux 9 is not directly irradiated to the thermocouple 2. Thereby, the luminous flux 9 is directly transmitted to the thermocouple 2.
Of the thermocouple 2 can be prevented from being raised due to the irradiation of the thermocouple. Further, by providing the heat insulating member 3 between the thermocouple 2 and the light shielding member 4, it is possible to prevent the heat from the light shielding member 4, which has been heated to a high temperature due to the absorption of the light flux 9, from being conducted to the thermocouple 2. Becomes Therefore, accurate temperature measurement of the lens 1 irradiated with the light beam 9 becomes possible.

Further, the light transmitting body measuring sensor 10 of the present invention
In addition, a temperature detection unit 30 including an electromotive force detection unit 31 that detects a temperature from the electromotive force generated by the light transmitting body measurement sensor 10 and a temperature display unit 32 that displays the temperature detected by the electromotive force detection unit 31 is provided. If the connection is made via the lead wire 6, a light transmitting body measuring device 20 that measures and displays the temperature of the transparent body can be realized.

In this embodiment, the surface of the light-shielding member 4 is coated with the infrared-reflective paint. However, the surface of the light-shielding member 4 may be a mirror surface or a silver-gloss surface.

The material of the infrared reflecting member 5 includes, for example, "Suncoat Thermoshield" (registered trademark) which is a sunlight reflecting paint manufactured by Nagashima Special Paint Co., Ltd. which is applied to a roof or the like for construction use. Origin Zuk # 100IR, an infrared reflective paint manufactured by Origin Electric Co., Ltd.
(Registered trademark) is preferably used. Alternatively, Japanese Patent Application Laid-Open
Coating materials disclosed in JP-A-6-256683, JP-A-05-4072, and JP-A-02-92530 may be used. Needless to say, any material may be used as long as it reflects a light beam including infrared light. Further, as the material of the heat insulating portion 3, a foam or glass wool can be considered.

[0029]

The light transmitting body temperature measuring sensor according to the present invention comprises:
Since the light shielding means is provided on the surface of the electromotive force generating means, it is possible to prevent the electromotive force generating means itself from absorbing light energy and increasing the temperature. Further, since the heat insulating means is provided between the electromotive force generating means and the light shielding means, even if the light shielding means is heated, the heat can be prevented from reaching the electromotive force generating means. Further, by providing the light reflecting means on the surface of the light shielding means, the temperature rise of the light shielding means itself can be suppressed. Thereby, the conduction of heat from the light blocking means to the electromotive force generating means can be minimized.

Since the electromotive force generating means is in contact with the surface of the light transmitting body, heat can be transferred only from the surface of the light transmitting body, and the surface temperature of the light transmitting body can be accurately measured. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a light transmitting body temperature measuring sensor showing an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining measurement by a light transmitting body temperature measuring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 2 Thermocouple 2a Temperature sensor part 3 Heat insulation member 4 Light shielding member 5 Infrared reflective paint layer applied to the surface of the light shielding member 6 Lead wire 7 Temperature display device 8 Arrow indicating heat transfer to thermocouple 9 Arrow indicating light flux 10 Light transmitting body temperature measuring sensor 20 Light transmitting body temperature measuring device 21 Sensor unit 22 Sensor protection unit 30 Temperature detection unit 31 Electromotive force detection unit 32 Temperature display unit

Claims (9)

[Claims] An electromotive force generating means for generating an electromotive force in accordance with a temperature of the sensor portion; and exposing the sensor portion to a position where the sensor portion can contact a light transmitting body which is an object to be measured. And a heat insulating means for coating. 2. The temperature sensor according to claim 1, wherein said electromotive force generating means is a thermocouple. 3. The temperature sensor according to claim 1, further comprising a light beam incidence preventing means provided at a position on the heat insulating means which does not hinder the exposure of the sensor unit. 4. The temperature sensor according to claim 3, wherein the light beam incidence preventing means is provided on at least a part of a surface of the heat insulating means. 5. The temperature sensor according to claim 3, wherein the light flux incidence preventing means includes a light blocking means for blocking light. 6. The temperature sensor according to claim 3, wherein the light flux incidence preventing means includes a light reflecting means for reflecting light. 7. The temperature sensor according to claim 6, wherein the light reflection means is a mirror surface or a light reflection surface having gloss. 8. The temperature sensor according to claim 6, wherein the light reflecting means is an infrared reflecting layer that reflects infrared light. 9. A temperature sensor according to claim 1, a temperature detecting means for detecting a temperature from an electromotive force generated in the light transmitting body temperature sensor, and a temperature for displaying the temperature detected by the temperature detecting means. A light transmitting body temperature measuring device, comprising: display means.