Focusing device and a telescopic tube module thereof

Details Focusing device and a telescopic tube module thereof Focusing device and a telescopic tube module thereof

2008-03-04

2008-03-04

Dang, Hung X. (Department: 2873)

Optical: systems and elements

Compound lens system

Telescope

C359S406000, C359S823000

Reexamination Certificate

active

07339729

ABSTRACT:
A focusing device and a telescopic tube module thereof are for use with optical equipment. The focusing device has a base module and a telescopic tube module. The base module has a housing, a shaft, and at least two bearings. The telescopic tube module has a tubular body, a bottom reinforced member, and an upper reinforced member. The bottom reinforced member is a reinforced board. The upper reinforced member includes at least two reinforced strips. The tubular body is slidably disposed in the housing. The shaft supports the bottom reinforced member. The at least two bearings support the upper reinforced member. When the shaft drives the tubular body to move, the stability and the precision of the focusing device are improved, and the durability of the tubular body is improved.

REFERENCES:
patent: 6937392 (2005-08-01), Compton

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