Door scope

Details Door scope Door scope

1977-09-26

1979-10-30

Sacher, Paul A.

350 69, 350 78, 350159, 350205, G02B 300

Patent

active

041726367

ABSTRACT:
A door scope provided in a door for viewing outside from inside includes an optical system consisting of five lenses: a large diameter objective having a concave rear face, two auxiliary objectives having concave rear faces, a biconcave compensation lens and an eyepiece. The compensation lens is located behind the two auxiliary objectives or therebetween. A peep preventing device consisting of two polarizers one of which is made rotatable with respect to the other is attachable to the door scope. The compensation lens is preferably made of glass material different from that of the other lenses to correct chromatic aberration.

REFERENCES:
patent: 3514188 (1970-05-01), Blosse et al.
patent: 4082434 (1978-04-01), Hayashi et al.

Affiliated with

Also associated with

Rating

Door scope does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-17376