1978-12-20
1980-11-11
Corbin, John K.
350174, 350175FS, 350216, 350220, G02B 934, G02B 960, G02B 1706
Patent
active
042329434
ABSTRACT:
A collimating magnifier lens which may be used in a head-up display has a focal length of F. The lens has a front part comprising at least one positive element with a focal length between +1 F and +3 F and a negative element with a focal length between -1.2 F and infinity, the focal length of the front part as a whole being between +1 F and +6 F and the negative element of the front part not being cemented to any other element, a rear part comprising a single positive element with a focal length between +0.4 F and +1.2 F, and a field flattener behind the rear part and comprising a single negative element with a focal length between -0.4 F and -1.1 F.
The negative element of the front part may have a refractive index less than or equal to 0.13 greater than that of any positive element of the front part and may be meniscus in shape having a focal length of at least 2.8 times that of the positive component and which produces overcorrect spherical aberration. A single positive element with a focal length between +1.4 F and infinity may be used as a middle part. The air gap in front of the rear part is preferably between 0.6 F and 1.1 F, and the air gap between the rear part and the field flattener is preferably between 0.01 F and 0.5 F. The front part of the lens may have two positive elements. A mirror may be interposed in the gap between the rear and front, or rear and middle.
REFERENCES:
patent: 2472600 (1949-06-01), Luboshez
patent: 2537996 (1951-01-01), Hankes
patent: 3428386 (1969-02-01), Schlegel
Corbin John K.
Pilkington P. E. Limited
Sugarman Scott J.
LandOfFree
Modified Petzval lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified Petzval lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified Petzval lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1688182