Lens module

Details Lens module Lens module

2001-10-10

2003-04-29

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With support

C359S823000

Reexamination Certificate

active

06556363

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a lens, and more particularly to a lens module mounted on a circuit board which is provided with a chip for imaging.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a lens module
1
of the prior art is mounted on a circuit board
3
which is provided thereon with an electrically-connected chip package
5
. The chip package
5
comprises a chip
5
a
, a chip carrier
5
b
, and a transparent glass
5
c
. The chip
5
a
is disposed in a receiving cell of the chip carrier
5
b
such that the chip
5
a
is shielded by the glass
5
c
. The lens module
1
comprises a seat body
1
a
, which is fixed on the circuit board
3
by a plurality of screws
1
b
. The seat body
1
a
has a threaded hole
1
c
corresponding in location to the chip
5
a
. The threaded hole
1
c
is provided therein with a cylindrical body
1
d
in which a plurality of lenses
1
e
are fixed. The image of an object located in the outside of the seat body
1
a
is formed on the chip
5
a
via the lenses
1
e
. The focus between the lens
1
e
and the chip
5
a
is adjusted by setting the depth of the cylindrical body
1
d
in the threaded hole
1
c
. Such a prior art focus adjustment structure as described is rather inconvenient, complicated in construction, and not cost-effective.
As shown in
FIG. 2
, another prior art lens module
2
is mounted on a circuit board
4
which is provided thereon with a chip
6
electrically connected therewith. The lens module
2
comprises a seat body
2
a
which is fastened with the circuit board
4
by a plurality of screws
2
b
. The seat body
2
a
has a through hole
2
c
corresponding to the chip
6
. A plurality of lenses
2
d
are fixed in the through hole
2
c
. An elastomer
8
is sandwished between the circuit board
4
and the seat body
2
a
such that the upper end of the elastomer
8
is coupled with the seat body
2
a
so as to shield the fringe of the chip
6
. The elastomer
8
has an elastically expandable pleated portion
8
a
, which can be caused by an external force to change its height. As a result, the focus adjustment is attained in conjunction with a plurality of screws
2
b
. In spite of the structural simplicity of the lens module
2
, the effect of the components used to adjust or fix the distance between the lens
2
d
and the chip
6
is by no means simplified or enhanced. The focus adjustment is achieved by adjusting respectively the four screws
2
b
. In other words, these two prior art lens modules
1
and
2
share a common deficiency.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a lens module which is capable of an easy adjustment and fixation of focus between lens and chip.
The lens module of the present invention is mounted on a board body which is provided thereon with an image-forming chip. The lens module comprises a seat body in which at least one lens is fixed for use in enabling an image outside the seat body to impress on the chip. The seat body and the board body are provided therebetween with an expandable tube having a serpentine segment, thereby forming a closed passage between the lens and the chip. The expandable tube is provided with a fixation member serving to limit deformation of the serpentine segment of the expandable tube.


REFERENCES:
patent: 2002/0030150 (2002-03-01), Landolt

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