Title:
PROJECTION LENS SYSTEM
Document Type and Number:
Japanese Patent JPS63148219
Kind Code:
A
Abstract:
A projection lens system is described for projecting a magnified image from an image source (3, 4, 5) on a projection screen (10), which lens system comprises from the image end successively a first, positive lens group (L1) and at least a second, negative lens group (L3) whose surface (S6) facing the image end is concave. The first lens group consists of a single lens element (L1) which in addition to a first refractive surface (S1) facing the image end and a second refractive surface (S2) facing the object end has a third radiation-reflecting surface (S3) which is located between the first and the second surface.
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Inventors:
YOSEFUSU YOHANESU MARIA BURATS
Application Number:
JP29427287A
Publication Date:
June 21, 1988
Filing Date:
November 24, 1987
Export Citation:
Assignee:
PHILIPS NV
International Classes:
G02B9/10; G02B9/12; G02B13/16; G02B13/18; G02B27/18; H04N5/74; H04N9/31; (IPC1-7): G02B9/10; G02B9/12; G02B13/16; G02B13/18; G02B27/18; H04N5/74
Domestic Patent References:
| JPS60175019A | 1985-09-09 | |||
| JPS57185401A | 1982-11-15 | |||
| JPS60243601A | 1985-12-03 | |||
| JPS61189514A | 1986-08-23 |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)