| 摘要 |
A specific lens with a high sensitivity to an eccentricity is selected from a lens optical system and is provided with a tilting mechanism, which enables the tilt angle of the lens to be adjusted from outside a lens barrel. After lenses are fitted into the lens barrel, the tilting mechanism enables the adjustment of a resolution while the image quality of the lens optical system is observed. A second lens frame for supporting a second lens, which has the greatest effect on the resolution in the lens optical system, is arranged inside a first lens frame. A reference pin and two eccentric pins are provided at regular intervals of 120 degrees on the circumferential surface of the first lens frame. The reference pin and two eccentric pins support the second lens frame from the outside. The pins are inserted into grooves formed in the second lens frame. A projecting part is formed at the outer circumference of the second lens frame, and the projecting part comes into contact with the first lens frame. The second lens frame is tiltable about the projecting part. A tool such as a screwdriver is inserted into a hole of a fixed cylinder to rotate the eccentric pins, thereby adjusting the tilt angle of the second lens.
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