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Digital Camera Patent Abstract
A digital camera module (200) includes a lens holder (20), a lens
module (30) received in the lens holder, and an image sensor chip
package (40) mounted to the lens holder. The lens module includes
a lens barrel (301) movably engaged in the lens holder and at least
one lens (302) received in the lens barrel. The image sensor chip
package includes a base (401), an image sensor chip (402) mounted
on the base, a transparent cover (405), and an adhesive (50) positioning
the transparent cover with respect to the image sensor chip. The
adhesive and the transparent cover cooperatively seal the image
sensor chip therein.
Digital Camera Patent Claims
1. A digital camera module, comprising: a lens holder in a shape
of a hollow cylinder; a lens module received in the lens holder,
comprising a lens barrel and at least one lens received in the lens
barrel; and an image sensor chip package mounted to the lens holder,
comprising: a base comprising a top surface and a plurality of top
pads arranged on the top surface; an image sensor chip mounted on
the top surface of the base, the image sensor chip comprising a
photosensitive area configured for receiving light transmitted through
the lens module, and a plurality of chip pads around the photosensitive
area; a plurality of wires each electrically connecting one of the
chip pads of the image sensor chip with a corresponding one of the
top pads of the base; an adhesive means applied on peripheral edge
of the image sensor chip, over the wires, the adhesive means covering
areas where the wires connects with the chip pads; and a transparent
cover mounted to the image sensor chip via the adhesive means, the
cover together with the adhesive means sealing the photosensitive
area of the image sensor chip.
2. The digital camera module as claimed in claim 1, wherein the
lens holder receives the top pads of the base of the image sensor
chip package therein.
3. The digital camera module as claimed in claim 1, wherein the
base comprises a bottom surface opposite to the top surface and
a plurality of bottom pads arranged on the bottom surface, each
bottom pad corresponds to and electrically connects with a corresponding
top pad.
4. The digital camera module as claimed in claim 1, wherein the
adhesive means covers the whole of each wire and covers areas where
the wires connects with the top pads of the base.
5. The digital camera module as claimed in claim 1, wherein the
cover comprises a bottom surface touching the top of each wire.
6. The digital camera module as claimed in claim 1, wherein the
lens holder has an internal thread formed on an inner surface, the
lens barrel has an external thread corresponding to and screwing
with the internal thread of the lens holder, the external thread
is formed on an external surface of the lens barrel.
7. The digital camera module as claimed in claim 6, wherein the
lens barrel is screwed with the lens holder, and the adhesive means
is applied to a portion of the lens barrel which is exposed to outside.
8. The digital camera module as claimed in claim 1, wherein the
lens holder has a stepped shaped rear end comprising a first step
surface and a second step surface, wherein an inner periphery of
the first step portion has a dimension larger than that of the outer
periphery of the cover, and an inner periphery of the second step
portion has a dimension slightly smaller than that of the outer
periphery of the cover.
9. The digital camera module as claimed in claim 8, wherein the
second step surface of the lens barrel connects with a periphery
of a top side of the cover via the adhesive means.
10. A digital camera module, comprising: a lens holder; a lens
module received in the lens holder, the lens module comprising a
lens barrel movably engaged in the lens holder and at least one
lens received in the lens barrel; and an image sensor chip package
mounted to the lens holder, the image sensor chip package comprising
a base, an image sensor chip mounted on the base, a transparent
cover, and an adhesive positioning the transparent cover with respect
to the image sensor chip, the adhesive and the transparent cover
cooperatively sealing the image sensor chip therein.
11. The digital camera module of claim 10, wherein the lens holder
is secured with the base, and surrounds the image sensor chip.
12. The digital camera module of claim 10, wherein the lens holder
is secured with the transparent cover by adhesive.
13. The digital camera module of claim 10, wherein the adhesive
is applied on a peripheral edge of a top side of the image sensor
chip, and the cover is spaced from the top side of the image sensor
chip, allowing light to be transmitted to the image sensor chip.
Digital Camera Patent Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention generally relates to digital camera
modules, and more particularly to a digital camera module with a
small sized image sensor chip package which is used in portable
electronic devices such as mobile phones, palm-top computers, personal
digital assistants (PDAs) and so on.
[0003] 2. Discussion of the Related Art
[0004] Generally, digital cameras are image recording media capable
of photographing a plurality of still images without using film.
Such a digital camera typically uses an image pickup device, which
is a kind of semiconductor device, such as a charge coupled device
(CCD) or complementary metal oxide semiconductor (CMOS). In the
digital camera, an object image formed on the image pickup device
through a lens is converted into an electrical signal by the image
pickup device, and the electrical signal is stored as a digital
signal in a mobile phone or PDA in which the digital camera is mounted.
[0005] A typical digital camera module 100 is illustrated in FIG.
1. The digital camera module 100 is constructed to include a holder
11, a lens module 12 and an image sensor chip package 13. The lens
module 12 includes a barrel 121, a lens 122, an IR (infra-red) cut
filter 123 and a cover 124. The barrel 121 is placed in and threadingly
engaged with the holder 11. The lens 122 is received in the barrel
121. The cover 124 is fixed to the barrel 121, on a front end of
the barrel 121 which is exposed to outside. The cover 124 has a
transparent area 125 which transmits light from outside to the lens
122. The IR-cut filter 123 is fixed to the barrel 121, opposite
to the cover 124. The image sensor chip package 13 includes a bottom
layer 131, a frame layer 132, an image sensor chip 133, a plurality
of wires 134 and a transparent board 135. The bottom layer 131,
which is made of printed circuit board (PCB), includes a plurality
of top pads 1311 on a top surface thereof and a plurality of bottom
pads 1312 on a bottom surface thereof. Each top pad 1311 corresponds
and connects to a respective bottom pad 1312. The frame layer 132
is mounted on the top surface of the bottom layer 131, containing
the top pads 1311 therein. The image sensor chip 133 is located
on the top surface of the bottom layer 131, surrounded by the top
pads 1311. The image sensor chip 133 includes a plurality of chip
pads 1331 provided on a top surface thereof. Each chip pad 1331
is electrically connected with a corresponding top pad 1311 via
a respective wire 134. The transparent board 135 is secured to the
top of the frame layer 132. The image sensor chip package 13 is
fixed to the holder 11, with the image sensor chip 133 facing the
lens module 12.
[0006] In the digital camera module 100, the top surface of the
bottom layer 131 peripherally surrounded by the frame layer 132
must contain the top pads 1311 and the image sensor chip 133 together,
and sufficient space should be provided between the image sensor
chip 133 and an inside wall of the frame 102 for movement of wire
bonding tools used to connect the wires 134 with the chip pads 1331
and the top pads 1311. Therefore, package volume for packaging the
chip 12 is a lot larger than that taken up by the chip 12, which
results in a relative larger volume of the digital camera module
100. As such, the digital camera module 100 is not suitable for
slim, compact electronic products.
[0007] What is needed, therefore, is a digital camera module with
small size, high reliability and high image quality.
SUMMARY OF THE INVENTION
[0008] In one embodiment thereof, a digital camera module includes
a lens holder, a lens module received in the lens holder, and an
image sensor chip package mounted to the lens holder. The lens module
includes a lens barrel movably engaged in the lens holder and at
least one lens received in the lens barrel. The image sensor chip
package includes a base, an image sensor chip mounted on the base,
a transparent cover, and an adhesive positioning the transparent
cover with respect to the image sensor chip. The adhesive and the
transparent cover cooperatively seal the image sensor chip therein.
[0009] Other advantages and novel features will become more apparent
from the following detailed description when taken in conjunction
with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Many aspects of the present digital camera module can be
better understood with reference to the following drawings. The
components in the drawings are not necessarily drawn to scale, the
emphasis instead being placed upon clearly illustrating the principles
of the digital camera module. Moreover, in the drawings, like reference
numerals designate corresponding parts throughout the several views.
[0011] FIG. 1 is a schematic, cross-sectional view of a typical
digital camera module;
[0012] FIG. 2 is a schematic, cross-sectional view of a digital
camera module according to a first embodiment of the present invention,
and
[0013] FIG. 3 is a schematic, cross-sectional view of a digital
camera module according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE PERFERRED EMBODIMENTS
[0014] Referring to FIG. 2, a digital camera module 200 in accordance
with a first embodiment of the present invention is shown. The digital
camera module 200 includes a lens holder 20, a lens module 30 and
an image sensor chip package 40 both mounted on the lens holder
20.
[0015] The lens holder 20 has a front end 201, a rear end 203 opposite
to the front end 201, and a receiving cavity 205 penetrating through
the lens holder 20 from the front end 201 to the rear end 203. An
internal thread 207 is formed on an inner periphery surface the
lens holder 20.
[0016] The lens module 30 includes a barrel 301 and at least one
lens 302. The barrel 301 is a hollow cylinder for receiving the
at least one lens 302 therein, and has an external thread 3011 formed
on an external surface thereof. One end of the barrel 301 is covered
by a plate 303 which has a transparent region 3031 formed in a central
portion thereof. The transparent region 3031 aligns with an optical
axis of the lens 302 allowing light to be transmitted to the lens
302.
[0017] The image sensor chip package 40 includes a base 401, an
image sensor chip 402, a plurality of wires 403, an adhesive means
404 and a transparent cover 405.
[0018] The base 401 is made of a material such as a plastic, a
ceramic or a fibrous composite. The base 401 has a top surface 4011,
a bottom surface 4012 on an opposite side of the base 401 to the
top surface 4011, a plurality of top pads 4014 and a plurality of
bottom pads 4015. The top pads 4014 are arranged in a circular pattern
on the top surface 4011 of the base 401. The bottom pads 4015 are
arranged in a circular pattern on the bottom surface 4012. Each
bottom pad 4015 corresponds to and electrically connects with a
respective top pad 4014. It is to be understood that the top pads
4014 could also be embedded in the base 401 as shown in FIG. 2,
with a surface exposed to outside from the top surface 4011, and
the bottom pads 4015 also could be embedded in the base 401 with
a surface exposed to outside from the bottom surface 4012. The bottom
pads 4015 are used to electrically connect with other electronic
elements such as a PCB.
[0019] The image sensor chip 402 is adhered to the top surface
4011 of the base 401, surrounded by the top pads 4014. A top side
of the image sensor chip 402 is arranged with a photosensitive area
4021 and a plurality of chip pads 4022 around the photosensitive
area 4021.
[0020] The wires 403 are made of a conductive material such as
gold or aluminum alloy. One end of each wire 403 is connected/joined
with a respective chip pad 4022 of the image sensor chip 402, and
the other end of the wire 403 is connected/joined with a respective
top pad 4014 of the base 401.
[0021] The adhesive means 404, such as a silicone, epoxy, acrylic,
or polyamide adhesive, is applied peripherally around the image
sensor chip 402, over the wires 403. The adhesive means 404 covers
the wires 403 and junctions of the wires 403 and the pads 4014,
4022, in order to protect the wires 403 from crack from metal fatigue
and to ensure the connections between the ends of the wires 403
and pads 4014, 4022. It is to be understood that the adhesive means
26 could be applied to the peripheral edge of the image sensor chip
402, over the wires 403, therefore the adhesive means 404 covers
part of each wire 403 and junctions between the wires 403 and the
chip pads 4022.
[0022] The cover 405 is laid over the image sensor chip 402 which
receives light transmitted through the cover 405. A bottom surface
of the cover 405 touches the top of each wire 403, thereby being
supported by the wires 403. The cover 405 is adhered to the adhesive
means 404 and therefore seals the photosensitive area 4021 of the
image sensor chip 402 together with the adhesive means 404.
[0023] In assembling the digital camera module 200, firstly, an
adhesive means 50 such as glue is applied on the rear end 203 of
the lens holder 20. Secondly, the lens holder 20 with the adhesive
means 50 is located on the base 401 of the image sensor chip package
40, with the rear end 203 of lens holder 20 adhered to the top surface
4011 of the base 401 and containing the top pads 4014 of the base
401 therein. Thereafter, the adhesive means 50 is cured to fix the
lens holder 20 to the image sensor chip package 40. Thirdly, the
lens module 30 is inserted into the receiving cavity 205 of the
lens holder 20 from the front end 201 of the lens holder 20, with
the lens barrel 301 threadingly engaging with the lens holder 20,
then the lens module 30 is adjusted until it is properly focused
on the image sensor chip 402. Lastly, the adhesive means 50 is applied
to the front end 201 of the lens holder 20 and cured peripherally
around the outside surface of the lens barrel 301 exposed to outside
from the front end 201 of the lens holder 20, so as to secure the
lens barrel 301 to the lens holder 20.
[0024] It is to be understood that the lens holder 20 and image
sensor chip package 40 could be connected to each other via other
connecting assembly such as guiding holes (not shown) and guiding
poles (not shown) corresponding to the guiding holes. For example,
a plurality guiding holes could be defined in the rear end 203 of
the lens holder 20. Accordingly, a plurality guiding of poles would
be disposed on the top surface 4011 of base 401 of the image sensor
chip package 40, respectively inserted in and engaging with a corresponding
guiding hole. The adhesive means 50 would be applied on the top
surface 4011 of the base 401, around the periphery of the lens holder
20, in order to enforce the connection between the lens holder 20
and the base 401 of the image sensor chip package 40.
[0025] In a second embodiment of the present invention as shown
in FIG. 3, a digital camera module 300 has a similar structure to
the digital camera module 200. The digital camera module 300 includes
a lens holder 22, a lens module 32 and an image sensor chip package
42. The lens holder 22 includes a front end 221, a rear end 223,
a hole 225 and an internal thread 227. The lens module 32 is configured
to have a lens barrel 321 having an external thread 3211, at least
one lens 322 and a plate 323 having a transparent region 3231 formed
at a central portion of the plate 323. The image sensor chip package
42 includes a base 421 having a top surface 4211, a bottom surface
4212, a plurality of top pads 4214 and a plurality of bottom pads
4215, an image sensor chip 422 including a photosensitive area 4221
and a plurality of chip pads 4222, a plurality of wires 423, an
adhesive means 424 and a transparent board 425.
[0026] The difference between the image sensor chip package 300
and the image sensor chip package 200 is that the rear end 223 of
the lens holder 22 has a stepped shape including a first step surface
2231 and a second step surface 2232. An inner periphery of the first
step surface 2231 has a dimension slightly larger than that of the
outer periphery of the cover 425. An inner periphery of the second
step portion 2232 has a dimension smaller than that of the outer
periphery of the cover 425. The second step surface 2232 of the
lens holder 22 connects with the periphery of the cover 425, via
an adhesive means 52, so that the lens holder 22 is secured to the
image sensor chip package 42.
[0027] In the present invention, the image sensor chip is adhered
on the top surface of the base without a side wall, thus there is
no space restriction on the wire bonding tools' movements. Accordingly,
the size of the base can be sufficiently minimized to a size approaching
that of the image sensor chip, and the volume of the image sensor
chip package can also be minimized which results in a relatively
smaller volume for the digital camera module. In addition, the photosensitive
area of the image sensor chip is sealed by the adhesive means and
the cover. Since the adhesive means and the cover together form
a space therebetween which is relatively small to contain relatively
little dust and particles therein, the pollution and/or contamination
of the photosensitive area is reduced and the quality and reliability
of the digital camera module is much improved.
[0028] It is believed that the present embodiments and their advantages
will be understood from the foregoing description, and it will be
apparent that various changes may be made thereto without departing
from the spirit and scope of the invention or sacrificing all of
its material advantages, the examples hereinbefore described merely
being preferred or exemplary embodiments of the invention. |