Objective optical system

Details Objective optical system Objective optical system

2005-09-13

2005-09-13

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S677000, C359S687000, C600S160000, C600S168000

Reexamination Certificate

active

06943959

ABSTRACT:
In a nearer order from its object, a first lens group which has a negative refractive power, a brightness diaphragm, and a second lens group which has a positive refractive power, and a moving lens group which moves on an optical axis, conditions such as 2≦DL/fW≦6, and −2≦DVH/fW≦0.37 are satisfied under condition that DL(mm) indicates an air-converged length from an end surface near an image in the first lens group to an end surface nearer to an object in the moving lens group, fW(mm) indicates a focal length in an entire system in a wide angle end, DVH(mm) indicates a distance from the end surface near the object in the moving lens group to a front principal point. By doing this, it is possible to provide an objective optical system which can obtain a high magnification while securing a sufficient distance between the diaphragm which is disposed behind the optical axis direction converting element such as a prism to the moving lens group.

REFERENCES:
patent: 6160669 (2000-12-01), Nagaoka
patent: 51-62053 (1976-05-01), None
patent: 1-279219 (1989-11-01), None

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