Cylindrical inner surface scanner and imaging control method in

Details Cylindrical inner surface scanner and imaging control method in Cylindrical inner surface scanner and imaging control method in

1994-09-22

1997-01-07

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359212, 359823, 250234, G02B 2608

Patent

active

055923240

ABSTRACT:
A holder (10) is movably inserted in a through hole (22A) of a base portion (22) of a scanning head which is movable along a central axis (27) of a cylindrical inner surface drum, through a ball guide (13). Projections (25, 10B) of the base portion (22) and the holder (10) are coupled with each other by a ball screw (15). Further, a lens holder (2) is inserted/supported in a through hole (10E), and an imaging lens (1) is fixedly provided in the lens holder (2). A pulse motor (24) which is coupled to the ball screw (15) is rotated by the number of pulses as applied. As the result, the holder (10) and the lens holder (2) are moved toward the central axis (27), followed by movement of an imaging position of the lens (1). An iris (16) is fixedly provided on an incident side end surface of the lens holder (2) adjacently to the lens (1), so that its stop diameter is varied by a DC motor (18)

REFERENCES:
patent: 4994678 (1991-02-01), Sasaki
patent: 5025157 (1991-06-01), Katsuaki

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