JP3214896B2 - Thermography equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermography apparatus for acquiring an infrared image, and more particularly to a thermography apparatus having a visible light image acquisition function.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional thermographic apparatus disclosed in Japanese Patent Application Laid-Open No. 2-126125, FIG. 1 (a) is a front view, and FIG. 1 (b) is a side view. . 1A and 1B, infrared light from the visual field is directed to a condenser mirror 35 via a vertical scanning mirror 31 and a horizontal scanning mirror 33, and is directed to a central portion of the horizontal scanning mirror 33 by the condenser mirror 35. The light is condensed so as to pass through the opened opening, and is further focused on an infrared detector 38 via a relay lens 37 and detected. 32 and 34 are motors for driving each scanning mirror.

In the above example, an infrared image can be obtained by supplying an infrared video signal obtained from the infrared detector 38 through scanning in the state of FIG. 1 via an image memory or directly to a display device. By disposing the visible light detector at the position of the intermediate focusing point 45 and supplying a visible light image signal obtained from the visible light detector to the display device with scanning, the visible light having the same optical axis and the same field of view as the infrared image is obtained. An optical image can be obtained.

[0004]

Although such a conventional thermographic apparatus can acquire an infrared image and a visible light image in the same field of view, since the apparatus is provided with a condensing mirror, the apparatus can be downsized. There are limitations. As for miniaturization,
By using an infrared lens instead of a converging mirror, it is possible to reduce the size more than before.However, since an infrared lens usually has a very low transmittance of visible light, a visible light detector Is difficult to obtain a visible light image.

[0005] The present invention has been made in view of the above points, and has as its object to enable a thermographic apparatus using an infrared lens to acquire a visible light image.

[0006]

In order to achieve this object, the present invention relates to a thermographic apparatus for detecting infrared light, which is obtained by scanning a field of view by a scanning means and focusing the infrared light on an infrared detector using an infrared lens. A detector, a lens switching unit for removing the infrared lens from the optical path and inserting a visible light lens in the optical path, and the visible light lens when the visible light lens is inserted in the optical path by the lens switching unit. Detector switching means for substantially disposing the visible light detector near the formed visible light focusing point.

[0007]

In the thermographic apparatus according to the present invention, a lens switching means for switching an infrared lens to a visible light lens and inserting the same into the optical path, and when the visible light lens is inserted into the optical path by the lens switching means, provides the visible light. Detector switching means for substantially disposing the visible light detector near the convergence point of visible light formed by the lens is provided to switch between an infrared image and a visible light image in the same field of view. Can be obtained.

An embodiment of the present invention will be described below in detail with reference to the drawings.

[0009]

FIG. 2 shows an embodiment of the present invention.
The same components as those of the conventional example are denoted by the same reference numerals. In FIG. 2, infrared rays from the visual field
After being directed to the infrared lens 39 via the horizontal scanning mirror 33 and converged by the infrared lens 39, it is guided to the infrared detector 38 via the relay lens 37 and detected. The visible light lens 40 is fixed to the same base 41 as the infrared lens 39. By moving the base 41 in the direction of arrow A, the visible light lens 40 can be alternately inserted into and removed from the optical path. Reference numeral 42 denotes a switching mirror mounted on the base 41 so as to align the optical axis with the visible light lens. Reference numeral 43 denotes a visible light detector disposed outside the optical path.

In the above configuration, when a visible light image is obtained, the base 41 is moved and the visible light lens 40 is inserted into the optical path. At this time, the switching mirror 42 is also inserted into the optical path, and the visible light focused by the visible light lens is
In order to reach the visible light detector 43 by 2, the visible light image can be acquired by supplying the output signal of the visible light detector to the display device.

In the above embodiment, the switching mirror 42 is attached to the base 41 and inserted into the optical path in mechanical synchronization with the visible light lens 40. However, the switching mirror 42 is moved in the optical path by another moving mechanism. The lens 4 for visible light
The switching mirror 42 may be inserted into the optical path in electrical interlock with the insertion into the optical path. Further, the visible light detector may be moved and arranged near the focus of the visible light lens in conjunction with the insertion of the visible light lens into the optical path without using the switching mirror.

[0012]

As described in detail above, according to the present invention,
Even in a thermographic device using an infrared lens,
A visible light image having the same field of view as the infrared image can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional example.

FIG. 2 is a diagram showing one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 31 vertical scanning mirror 33 horizontal scanning mirror 39 infrared lens 40 lens for visible light 41 base 42 switching mirror 43 visible light detector

Claims (1)

(57) [Claims] 1. A thermographic apparatus for detecting infrared rays guided by scanning a field of view by a scanning means by an infrared lens by an infrared lens, wherein the visible light detector and the infrared lens are removed from the optical path and the infrared rays are removed from the optical path. Lens switching means for inserting a visible light lens, and the visible light is substantially located near a focal point of visible light formed by the visible light lens when the visible light lens is inserted into an optical path by the lens switching means. A thermographic apparatus, comprising: detector switching means for disposing a photodetector.