Focusing controller for survey instrument

Details Focusing controller for survey instrument Focusing controller for survey instrument

1998-10-22

2000-04-04

Masih, Karen

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318257, 318280, 318282, 318445, 318443, 318466, 318468, H02P 100

Patent

active

060465573

ABSTRACT:
The present invention provides a focusing controller for a survey instrument, and the focusing controller comprises a sliding tube for retaining a focusing lens and movable in the direction of an optical axis, a motor for moving the sliding tube in the direction of the optical axis, a motor driving control circuit for driving the motor, a rotating speed control switch which serves as a means for inputting coarse adjustment control to the driving circuit, and a rotating position control switch which serves as a means for inputting fine adjustment control to the motor driving circuit, whereby the focusing lens is moved at a speed proportional to rotating angle of a rotating speed control switch by turning the rotating speed control switch for coarse control, and the focusing lens is moved to a position corresponding to rotating angle of a rotating position control switch by turning the rotating position control switch for fine control.

REFERENCES:
patent: 4903134 (1990-02-01), Murashima et al.
patent: 5767989 (1998-06-01), Sakaguchi

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