Internal focus objective lens

Details Internal focus objective lens Internal focus objective lens

1995-03-14

1997-03-25

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

309761, 309763, 309770, G02B 962, G02B 960

Patent

active

056150490

ABSTRACT:
A compact internal focus objective lens system utilized in an astronomical telescope, tenestrical telescope, photo lens or the like has a superior ability to compose images when focusing on close or near objects. The lens system includes, in order from the object side, a first lens group G1 with a positive refractory power and a second lens group G2 with a negative refractory power. The first lens group G1 includes a composite lens L1 with a negative lens L11 and a positive lens L12 and a single lens L2 with a positive refractory power. The second lens group G2 has a composite lens L3 that has an overall negative refractory power. The second lens group G2 is moved along the optical axis for focusing. The objective lens satisfies the following conditions, thus permitting the compact internal focus objective lens system to clearly compose images, when focusing on close or near objects:

REFERENCES:
patent: 2660093 (1953-11-01), Bertele
patent: 4037935 (1977-07-01), Momiyama
patent: 4206971 (1980-06-01), Hamanishi et al.
patent: 4359272 (1982-11-01), Kreitzer
patent: 4457595 (1984-07-01), Mihara
patent: 5309284 (1994-05-01), Nakatsuji
patent: 5402268 (1995-03-01), Tatsuno

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