Automatic electronic rangefinder

Details Automatic electronic rangefinder Automatic electronic rangefinder

1975-12-31

1977-08-09

Adams, Russell E.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 352140, 356 3, G03B 708

Patent

active

040415058

ABSTRACT:
An automatic focusing system is provided to process amplitude and phase signals of image motion in an image plane. The camera includes a focusable objective lens, optical means, oscillating means, sensing means, and a servo. Light rays reflected from an object to be focused upon are received and refracted by the objective lens to the optical means which has a rear nodal point. The optical means receives and refracts the light rays to form an image of the object in an image plane. The optical means is oscillated about the rear nodal point by the oscillating means. While the optical means is being oscillated the image remains stationary in the image plane when the objective lens is focused upon the object, but is transversely displaced and oscillates in the image plane when the objective lens is not focused upon the object. The sensing means detects and processes amplitude and phase signals generated by image motion in the image plane and directs the servo to drive the objective lens into focus.

REFERENCES:
patent: 3398665 (1968-08-01), John, Jr. et al.
patent: 3784305 (1974-01-01), Hartmann
patent: 3849643 (1974-11-01), Takeda

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