Positioning mechanism of ophthalmologic apparatus

Details Positioning mechanism of ophthalmologic apparatus Positioning mechanism of ophthalmologic apparatus

1993-06-15

1994-10-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341161, G01D 534

Patent

active

053528891

ABSTRACT:
Disclosed is a positioning mechanism of an ophthalmologic apparatus in which the operation property of the conventional mechanical vertical movement mechanism is kept while the feature of the vertical movement by means of electrical driving source or the like is utilized. That is, a positioning mechanism of an ophthalmologic apparatus for making positioning so as to obtain a predetermined height relationship between a subject eye and a measurement system or an inspection system of the ophthalmologic apparatus, comprises: a driving means for moving the measurement system or the inspection system relative to the subject eye; an operation knob to be operated for the operation of vertical movement; a speed detection means for detecting rotating speed of the operation knob; and a control means for non-linearly controlling the quantity of driving of the driving means relative to the rotation of the rotary knob on the basis of the result of detection of the speed detection means.

REFERENCES:
patent: 4442351 (1984-04-01), Pfeifer et al.
patent: 4916440 (1990-04-01), Faeser et al.

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