Lens assembly

Details Lens assembly Lens assembly

2001-04-06

2002-07-23

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With support

C359S823000, C359S824000

Reexamination Certificate

active

06424472

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention is related to a lens assembly, and more particularly to a lens assembly which employs an electromagnetic coil for creating magnetic force to adjust the focal length of the lens assembly.
FIG. 6
shows a conventional CCD lens assembly including a hollow lens seat
92
mounted on the CCD module
91
. The lens seat
92
is formed with an inner thread section
921
in which a lens holder
93
is screwed. A lens
94
is disposed on the lens holder
93
.
Such CCD lens assembly adjusts focal length by means of rotating the lens holder
93
. However, the adjustment must be manually made and the adjustment range is limited. Moreover, with respect to the CCD lens assembly, it is hard to further adjust the focal length.
In the mechanical focusing mechanism of existent lens assembly, a motor via a reducing gear assembly drives the lens holder for adjusting focal length. Such structure is complicated and quite expensive so that it can be hardly widely used.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a lens assembly. An electromagnetic coil is wound around the circumference of the lens seat. The lens holder is made of magnetic conductive material. After the coil is powered on, the coil creates a magnetic force to push and move the lens holder and change the distance between the lenses and thus adjust the focal length of the lens assembly.
It is a further object of the present invention to provide a lens assembly which is adjustable in focal length. The lens assembly has very simple structure and is manufactured at low cost.
The present invention can be best understood through the following description and accompanying drawings wherein:


REFERENCES:
patent: 4472024 (1984-09-01), Konomura et al.
patent: 4643522 (1987-02-01), Takashima
patent: 4764911 (1988-08-01), Morota et al.
patent: 4769803 (1988-09-01), Yamamiya
patent: 5850575 (1998-12-01), Ohishi
patent: 6278666 (2001-08-01), Nakata et al.
patent: 6359740 (2002-03-01), Tsuchiya

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