| 摘要 |
PURPOSE:To focus and image-form the infrared rays from an object with a reflection mirror optical system and to obtain the practically sufficient performance by using a rotational secondary curved surface reflection mirror as a converging optical system. CONSTITUTION:The first large concave mirror 11 is directed to an incident light side, a reflection mirror from a plane mirror 3 for scanning an objective surface is converged and the image of a point 13 to be scanned is formed at a detecting device 6 with a small concave mirror 12. A straight line to link the center of the large concave mirror and the far focus is the optical axis of the incident side, the reflecting direction by the second reflection mirror 12 on the light on the axis is the optical axis of the coming-out side and the outline of the optical arrangement when these both optical axes are specified in parallel to a (z) axis is shown in Fig. (b). When a small mirror 12 is a convex mirror, the Cassegrain-type optical arrangement is executed, the hole is provided at the optical axis part of the first concave mirror 11, and the reflecting light from the small mirror 12 is focused through the hole. Thus, the infrared rays from the object are focused and image-formed by the reflection mirror optical system and the practically sufficient performance can be held.
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