JPS6025559Y2 - Aiming structure of radiation thermometer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an aiming structure for a radiation thermometer whose measurement optical system is a Cassegrain system composed of a convex mirror and a concave mirror.

In order to measure temperature without contacting the object to be measured, a radiation thermometer needs to indicate which part is being measured.

Especially in the case of a radiation thermometer for microscopic surfaces, it cannot be used without this function.

For this reason, the measurement position is indicated by a light spot.

As an example of a conventional configuration, as shown in FIG. 1, an aiming light emitter 2 has a small aiming lens 1 glued to its front surface, and a main optical system 3 is provided behind the aiming light emitter 2. There is a radiation thermometer equipped with a radiation temperature sensor 4.

This thermometer has a simple structure and is convenient, but the accuracy of the optical axis and the focal position of the aiming light spot 5 is not good.

Further, there was a problem in that the part of the aiming light emitter 2 became an obstacle, and a part of the incident energy due to infrared radiation from the surface to be measured 6 was lost.

Another conventional configuration example is a radiation thermometer in which a light source 7 such as a lamp and a half mirror 8 are arranged between a main optical system 3 and a radiation temperature sensor 4, as shown in FIG.

This thermometer is constructed by using the main optical system 3 to obtain 1. The focal position of the light spot 5 can be determined accurately.

However, there are problems in that a space is required to accommodate the half mirror 8, energy loss due to the half mirror 8 is large, and the sensor 4 is adversely affected by heat and stray light from the light source 7.

This invention solves these conventional problems, does not block the optical path of the main optical system, does not cause loss of incident energy, provides accurate light point aiming function, and furthermore, It is an object of the present invention to provide an aiming structure for a radiation thermometer that can indicate the optimum measurement distance for minimizing the temperature measurement range, as well as indicate the center point of temperature measurement.

This idea consists of a concave mirror that receives infrared radiation from the surface to be measured, and a convex mirror that is placed in front of the concave mirror and has a smaller diameter than the concave mirror and forms an image of the surface to be measured on the sensor. , comprising an aiming light emitting body provided on the back side of the convex mirror and having a diameter smaller than the diameter of the convex mirror, and an aiming lens provided to focus an image of the aiming light emitter on the surface to be measured. Features.

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 3 is a cross-sectional view of the structure of a radiation thermometer probe according to an embodiment of the present invention.

1 is an aiming lens.

Reference numeral 2 denotes a light emitter for aiming, which is provided at the rear of the lens 1.

A main optical system 3 is provided on the back side of this aiming light emitter 2.

This main optical system 3 consists of a convex mirror 3a and a concave mirror 3b.

A hole 9 passing through the center of the concave mirror 3b in the front-rear direction
is provided.

Infrared rays emitted from the surface to be measured 6 pass through the hole 9 along an entrance optical path indicated by a broken line and enter the radiation temperature sensor 4.

The aiming light emitter 2 and lens 1 for focusing on the light spot 5 are located on the back side of the convex mirror 3a, and are configured so as not to block the incident optical path of the infrared rays.

The dashed line indicates the optical path of the aiming light emitter 2.

FIG. 4 is a cross-sectional view showing details of the aiming structure according to the embodiment of this invention, and FIG. 5 is a cross-sectional view taken along line AA'.

The aiming light emitter 2 is soldered to the printed board 11.

This printer plate 11 is supported by a support plate 12 to which a convex mirror 3a is fixed, and a boss 13.

The boss 13 is attached to the support plate 12 by three screws 14, 15, 16.

These screw holes 17 are formed larger than the screw diameter, so that the boss 13 can be fixed after adjusting the mounting position.

At this time, the printed board 11 is fitted into the support plate 12 so that the printed board 11 does not move.

The aiming lens 1 is fixed to a cylindrical body 18.

This cylindrical body 18 can be fixed to the boss 13 by adjusting its position in the forward and backward arrow directions using screws 19.

When adjusting the radiation thermometer with the aiming structure according to this embodiment, first place a light source of a small light emitting diode at the position of the sensor 4, and use the convex mirror 3a and concave mirror 3b of the main optical system 3 to Focus the image of this light source on the position.

Next, the aiming light emitter 2 is attached to this image by the aiming lens 1.
Match the images.

In order to focus the aiming light emitter 2, the cylindrical body 18 is fixed to the boss 13 with a back and forth adjustment screw 19.

In order to correct the misalignment of the spot position, the boss 13 is attached to the support plate 1.
2, move it tightly and tighten the three screws 14.15.1.
Fix it at 6.

At this time, since the cylinder 18 is fixed to the boss 13, the focus will not shift.

With such adjustment, the point where the optical axis of the main optical system 3 and the measurement area are minimized can be indicated by a light spot.

As explained above, if the aiming structure according to this invention is used, the optical path of the main optical system will not be blocked by the aiming optical system since the conventional aiming structure is improved.

Further, there is no loss of incident energy, and an accurate light point aiming structure can be provided.

Furthermore, along with aligning the optical axis and indicating the center point of temperature measurement,
The optimum measurement distance for minimizing the temperature measurement range can be indicated.

Another advantage is that by selecting the size of the aiming light emitter, the size of the projected light spot can be matched with the measurement range.

It is particularly effective in measuring the temperature of microscopic surfaces.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the aiming structure of a conventional radiation thermometer. FIG. 2 is a diagram showing the aiming structure of another conventional radiation thermometer. FIG. 3 is a sectional view showing the aiming structure of an embodiment of the radiation thermometer probe according to this invention. FIG. 4 is a sectional view showing the details thereof. Figure 5 is a V cross-sectional view. 1... Aiming lens, 2... Aiming light emitter, 3... Main optical system, 3a... Convex mirror 3b... Concave mirror, 4...
Radiation temperature sensor, 5... Light spot, 6...
Surface to be measured, 7... Light source, 8... Half mirror 19... Hole, 11... Printed board, 12... Support plate , 13...boss,
14, 15, 16...Nage, 17...
・Screw hole, 18...Cylinder, 19...Screw.

Claims (1)

[Scope of utility model registration request] A concave mirror that receives infrared radiation from the surface to be measured; a convex mirror that is placed in front of the concave mirror and has a smaller diameter than the concave mirror and forms an image of the surface to be measured on a sensor; and the convex mirror. A radiation thermometer comprising an aiming light emitting body provided on the back side of the lens and having a diameter smaller than the diameter of the convex mirror, and an aiming lens provided to focus an image of the aiming light emitter on the surface to be measured. Aiming structure.