JPS6411224A - Optical axis moving mechanism for optical system - Google Patents

Abstract

PURPOSE:To facilitate the adjusting work of an optical axis of an optical system by inserting a light transmission body in which a light incident surface and a light emitting surface are parallel to each other and which has a uniform refractive index, so that the light incident surface and the light emitting surface become a direction for crossing the optical axis of the optical system, and also, the direction to the optical axis can be changed. CONSTITUTION:The titled mechanism is constituted so that an angle to an optical system optical axis AX1 of a light transmission body PS inserted between an image pickup lens L and an object O can be varied. In case the transmission body is not inclined, a point on the surface of the object O corresponding to an image I formed on a photodetector by the image pickup lens L becomes a more distant point T0 than a point T0V in case the transmission body PS is not inserted, on the extension of the optical axis AX1 of the optical system. When the transmission body PS is inclined by angle theta, the point on the object ) to the image I on the photodetector D becomes TH, and in the end, an equivalent effect to a fact that an effective optical axis between the light transmission body PS and the object O has moved by a distance delta is obtained. In such a way, a work for an axial alignment of the optical system is facilitated.