| 摘要 |
PURPOSE:To adjust optical system and let focusing to be performed with high accuracy by photoelectrically converting the light from the different routes whose relative positions are changed according to focusing thereby forming the electric signals associated to the relative positions of the image. CONSTITUTION:Objective lenses 1 and 2 are disposed by leaving a suitable reference line distance. The deviation in the relative position of the object image formed by the objective lens 2 on a photoelectric element group 6 when the position of the object image formed by the objective lens 1 on a photoelectric element group 5 may be adjusted. The outputs of the photoelectric element groups 5, 6 are signal-processed in an electric circuit 9, by which they are converted to the output signals associated to the relative positions of the object images formed by the objective lenses 1, 2. These signals are supplied to a servo motor 10. This causes the photographing optical system 11 to move in the predetermined corresponding relations with the objective lens 2, thereby enabling the image of the object to be sharply formed on the film plane 13. |
