Projection lens system

Details Projection lens system Projection lens system

G - Physics

02

B

88/99

G02B 9/04 (2006.01) G02B 9/06 (2006.01) G02B 11/02 (2006.01) G02B 11/22 (2006.01)

Patent

CA 1050314

ABSTRACT OF THE DISCLOSURE A projection lens system is disclosed having a total focal distance of at least 400 mm and comprising a triplet. A positive lens is positioned substantially halfway between the triplet and the object to be projected. The triplet has a focal distance of between 1.2 and 2.5 times the total focal dis- tance of the projection lens system. The lens system has a relative opening which is larger than 1:3.5. The end lenses of the triplet and the positive lens consist of glass having a refractive index of less than 1.53. The inter- mediate lens of the triplet consists of glass having a refractive index of less than 1.63.

226075

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