Focussing apparatus having blurring indicator

Details Focussing apparatus having blurring indicator Focussing apparatus having blurring indicator

1981-09-16

1982-11-09

Perkey, William B.

354199, 354219, G03B 1316, G03B 1318

Patent

active

043581900

ABSTRACT:
A focussing apparatus for a camera, having an indicator for indicating the degree of blurring of an image produced by the taking lens, comprising a plano-concave lens and a plano-convex lens, of the same curvature, which accordingly have no refracting power when in contact with each other, disposed in the viewfinder's optical path. Signals from an object distance measuring means and a position detecting means for detecting the shifted position of the taking lens, are fed to a differential amplifier. The output of the differential amplifier, which corresponds to the degree of blurring of an image produced by the taking lens, causes the concave lens and/or the convex lens to shift so that the distance between these lenses is directly proportional to the degree of blurring and gives a visible indication of the same in the viewfinder.

REFERENCES:
patent: 3500736 (1970-03-01), Ewald
patent: 4041505 (1977-08-01), Hartmann

Affiliated with

Also associated with

Rating

Focussing apparatus having blurring indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focussing apparatus having blurring indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focussing apparatus having blurring indicator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-743897