A New Wide-Angle TV Projection Lens Having Aspherical Surfaces

Ellis Betensky

doi:10.1117/12.949266

14 February 1986 A New Wide-Angle TV Projection Lens Having Aspherical Surfaces

Ellis Betensky

Proceedings Volume 0554, 1985 International Lens Design Conference; (1986) https://doi.org/10.1117/12.949266
Event: 1985 International Lens Design Conference, 1985, Cherry Hill, United States

Abstract

Large rear-screen TV projection systems are typically enclosed in a large box. To reduce the volume of the box two mirror folds have been used. A new wide angle lens covering a 70-degree field has been developed which further reduces the volume, yet only requires one mirror. The design evolved from the earlier design types, having a relatively weak first group, a strong positive second group, and a negative field flattener. It is dependent upon the use of aspherical surfaces, having no analogous all-spherical type.

Citation Download Citation

Ellis Betensky "A New Wide-Angle TV Projection Lens Having Aspherical Surfaces", Proc. SPIE 0554, 1985 International Lens Design Conference, (14 February 1986); https://doi.org/10.1117/12.949266

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available