TW200531535A - Digital still camera module - Google Patents

Abstract

A digital still camera module disposed in a mobile phone includes a barrel, a first lens disposed in the barrel, a holder, an image pick-up element located at the back of the barrel. The portion of the barrel is received in the holder. The first lens is fixed in the barrel via a specific glue. The image pick-up element is packaged on the printed circuit board via a ceramic leaded chip carrier.

Description

200531535

[Technical field to which the invention belongs] In particular, the present invention relates to a digital camera module capable of preventing lens contamination. [Previous technology] It is favored by multimedia users, and at the same time it is enough to be mobile, so the digital image quality of digital camera digital camera depends on the digital piece. If the sensing element technology of the mobile phone object is taken from the inside, people need to set up a module on the mobile phone. The camera module of the module is still more developed in the camera. The realization of digital phones and the reasons for the increase in volume of mobile phones must be clear. The optical digital cameras and thin and short objects can be used to make phone calls. More needs to be smaller, that is, the device of the object device, the camera is small, the convenience of carrying the image is small, and the height is small. Therefore, the size of the image is good and bad. The camera is increasingly equipped with convenient functions. Therefore, the demand is that the same quality as the lens will be pursued more and more. People and mobile phones are installed in this type of photography. Their shooting distance and image are familiar. Digital camera modules usually include a lens. Base, a lens barrel, a plurality of lenses, and an image sensing element placed behind the lens. The plurality of lenses are usually fixed in the lens barrel by using an adhesive. The image sensing element is a plastic leaded core sheet carrier (Plastic Leaded Chip Carrier (PLCC) and other packages are electrically connected to the printed circuit board after packaging. Although this digital camera module can achieve the functions of capturing and imaging, it uses ordinary adhesives such as quick-drying glue, deoxidizing glue, etc. to fix the lens in the lens barrel. This kind of adhesive is used in the dispensing process. During the curing process after dispensing, it is easy to volatilize, and its vapor is easy to condense to the lens.

Page 5 200531535 V. Description of the invention (2) The surface 'causes the lens surface to be blurred, which reduces its light transmittance, which seriously reduces the light reflected by the object entering the digital camera module, thereby reducing the The optical image signal makes the optical image signal sensed by the image sensing element inconsistent, which reduces the imaging quality of the image captured by the digital camera, and the reliability of this adhesive bonding element is not good. In addition, the packaging of image sensors of conventional digital camera modules usually uses PLCC technology. This kind of packaging technology is more complicated and costly. In addition, plastics have poor moisture resistance, corrosion resistance, and deoxidation capabilities. The use of digital camera modules affects the use of image sensing elements. In addition, the lens of the conventional digital camera module is a magnesium fluoride film (referred to as

MgF2), this kind of film has poor corrosion resistance and is easy to absorb water droplets. It also causes lens pollution. I want to provide a digital camera module that can prevent the lens from being damaged and improve the image. [Summary of the Invention] The purpose of "Dan" is to provide a digital camera module capable of preventing lens contamination and improving mouthpieces. The present invention is a digital camera module that can be placed in a mobile phone. The J-bit camera module includes A lens barrel; a first lens-placed Erhai: the head: the part fixed in the lens holder;-the image sensor is set after the second brother. The lens is adhesive 0PT〇CAST 3410 solid ( Ce; the same c V f image sensing element is packaged on a circuit board by a ceramic leaded chip carrier (Leaded Chip Carrier). Compared with the conventional technology, the digital camera module of the present invention uses an adhesive 200531535

0PT0CAST Adhesive-guided lens barrel connection and use By using the chip carrier image sensor element lens set, put into action [Implementation method 34 10 lens contamination caused by placing the lens in the lens barrel, improve the The guilty degree 'improves the life of the digital device. In addition, the digital phase ceramic leaded chip carrier of the present invention can prevent moisture, corrosion, and parts from being damaged. In addition, the infrared cut-off on at least the surface is greatly reduced. The digital camera phone of the present invention. [Formula] 'Prevent the use of ordinary plastic lens light transmittance and the imaging quality of the lens and camera module image quality sensor module service is known to use plastic with poor oxygen capacity, improve the digital camera module of the invention It is assembled on the first filter film to avoid the height of the additional filter module. It is convenient to refer to the first figure. The digital camera module of the present invention includes a top cover 11, a lens barrel 12, a first lens 122, A second lens 124, a glass sheet 1 3, an image sensing element 14 and a lens holder 15. The image sensing element 14 includes an imaging surface 1 41, which is packaged in a Flexible Printed Circuit Board (FPC) by a Ceramic Leaded Chip Carrier (CLCC) 16. ) 1 7 so that the control circuit can be arranged to transmit signals. A part of the lens barrel 12 is embedded in the lens holder 15 and cooperates therewith. The first lens 122 and the second lens 124 are housed in the lens barrel 12. The top cover 11 is a ring-shaped cover, which includes two open ends 1 1 2, 1 1 4 so that the light reflected by the subject (not shown) enters the first lens 122 in the lens barrel 12 and A protective lens (not labeled) can be placed on the second lens 124 in the channel (not labeled) formed by the open ends 112 and 114 to prevent outside dust from falling into it.

200531535 V. Description of the invention (4) On the first lens 122, the top cover 11 is fixed on the top of the lens barrel 12. The lens barrel 12 is a hollow cylinder 'which contains the first lens 122 and the second lens 1 24, and a part of the lens barrel 12 is embedded in the lens holder 12 and closely fits it. Please refer to the second figure at the same time. Both the first lens 122 and the second lens 124 are used to focus the light incident from the subject, and both are housed in the lens barrel 12, and the outer diameters thereof respectively match the inner diameter of the lens barrel 12. The first lens 122 and the second lens 124 are fixed in the lens barrel 12 with an adhesive 18. The adhesive 18 used in the digital camera module of the present invention is 0PT0CAST 3410, and 0PT0CAST 3410 is by the British company Electronic Material Inc. · (Abbreviated as EMI) UV adhesive developed by the present invention. When the first lens 122 and the second lens 124 are fixed in the lens barrel 12 in the present invention, 0PT0CAST 3410 is used, firstly irradiated with ultraviolet rays for 10 seconds, and then two Secondary roasting, the first roasting is performed at a temperature of 75 to 85 ° c for 20 to 30 minutes, and the second roasting is performed at a temperature of 90 ° to 100 ° c for 20 to 30 minutes Minutes, because 0PT0CAST 3410 has low volatility, good stability, moisture resistance and moisture resistance, during the dispensing process, no vapor will be generated ', which can prevent the vapor of ordinary adhesives from attaching to the lens in the conventional technology. 'The lens surface is contaminated and oxidized, which causes the lens to be blurred, reduces the transmittance of light, and reduces image quality.

The first lens 122 has a half-moon shape and includes two aspheric surfaces 1222 and 1224 'where the aspherical surface 1222 is convex toward the object side, and the first lens 22 is made of glass' so that it can withstand external humidity, high temperature and prevent the lens from being damaged. Scratched. The second lens i 24 is an aspheric lens and is made of optical plastic material. It is placed behind the first lens 122 and the aspheric shape of the second lens 124

Page 8 200531535 V. Description of the invention (5) The aspheric shape of the lens 1 and 2 is similar and the two are symmetrical to eliminate aberration and improve the imaging quality of the digital camera module. The optical plastic material can exhibit high resolution due to its low birefringence. The optical plastic material used in the second lens 24 can be acrylic resin, polymethyl methacrylate (PMMA for short) ), Any of polycarbonate (PC). In addition, the aspherical surface 1222 of the first lens 122 is plated with an anti-reflection film (AR-Coating) formed by stacking silicon dioxide (Si02) and second pentoxide (Ta205) films at intervals. This increases the light transmittance and reduces light reflection of the first lens 122. An infrared cut filter (IR-cut coating) is coated on the other aspheric surface 1224 of the first lens 1 2 2 to prevent Infrared rays from the incident light of the subject enter the image sensing element 14 to prevent infrared rays from incident on the image sensing surface 1 4 1 of the image sensing element & 14 during normal shooting, causing interference and generating noise, At the same time, the filter settings in the digital camera module 10 can be omitted, the height of the digital camera module 10 can be reduced, and it can be better applied to various portable electronic products. The lens holder 15 series of hollow cylinders Shape, which includes two open ends (not labeled). One of the open ends is used to receive the lens barrel 12 and the other open end is provided with a groove (not labeled) along the inner circumference to avoid longitudinally ^ Test piece 14 and ceramic leaded chip carrier i 6, I 3 glass sheet received in and cooperate with the circumferential surface of the lens holder 15 within lens holder 15, placed on the imaging surface of the rear barrel 12 and before the image sensing element 14 to protect the image sensing element 141 H. The image sensing element 14 is a complementary metal oxide semiconductor

200531535 V. Description of the invention (6) (Coniplementary Meta bu 0xide Semic〇nduct〇r, the next

CMOS) image sensor, which is used to convert the number of shots from an external subject into an electronic video signal, 1v ~ ~ fL of the image port η :: two lens holder 15. Because the package size of Tao Wan's leaded core carrier 16 is small, and the upper part is flat,:! Can ί: shape, so the height of the package is relatively sloppy, so that the optical adjustment is very fast, and this type of package is early. The technology has better thermal performance, and can achieve high operation stability under a wide range of temperature II. &Amp; The image sensing element 14 of the camera module of the present invention is presented by a ceramic leaded chip 丨6 is mounted on a flexible printed circuit board 17, pins 162 are provided on both ends of the ceramic leaded chip carrier 16, and the image sensing element 14 is connected to the ceramic leaded chip carrier by a wire bonding method 16 is connected, and the pin 162 is connected to the flexible printed circuit board 17 by mistake, so that a circuit is formed to transmit the signal. The wire bonding means that the chip is first fixed on the lead frame, and then the circuit on the chip is thin metal wire. Connect with the feet on the lead frame. Assembling the day guard 'first put the glass sheet 13 in the lens holder 15 and make the two fit tightly, and then place the packaged image sensing element 14 from the lens holder 15 bis ^ The open end is placed in the lens holder 丨 5 so that The ceramic lead chip carrier 6 is embedded in the groove of the lens holder 15 and cooperates with it. At the same time, the part of the lens barrel 12 to which the first lens 122 and the second lens 124 are fixed is built in one of the open ends of the lens holder 15 In the lens mount 15, the top cover η is finally placed on the top of the lens barrel 12. The digital camera lens module 100 and the image sensing element of the present invention may also be replaced by other photoelectric conversion elements or image sensing elements such as a charge coupled device (Charge Coupled Device, CCD for short). Digital camera lens module of the present invention 200531535 ____ V. Description of the invention (7) Group 10 can be built not only in mobile phones' but also in other portable electronic devices such as personal digital assistants. The top cover 11 of the digital camera lens module 10 of the present invention may be omitted, and it may also be replaced by a protective lens. To sum up, the present invention complies with the elements of the invention patent, and a patent application is filed according to law. However, any modification or change familiar with the skill of the case should be a preferred embodiment, and it is within the scope of the equivalent benefits of the spirit. The above are only the inventors of the present invention.

Page 11 200531535_ Brief description of the drawings [Simplified description of the drawings] The first diagram is a schematic diagram of the structure of the digital camera module of the present invention; the second diagram is the diagram of the first lens and the second lens of the digital camera module of the present invention . [Description of main component symbols] Digital camera module 10 Top cover 11 Lens barrel 12 First lens 122 Second lens 124 Glass sheet 13 Image sensing element 14 Imaging surface 141 Lens holder 15 Ceramic lead wafer carrier 16 Flexible printed circuit board 17 Open ends 112, 114 Thread 121 Adhesive 18 Aspherical surface 1222 > 1224 Lead 182 Pin 162

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Claims (1)

200531535_______ 6. Scope of patent application 1. A digital camera module that can be placed in a mobile phone. The digital camera module includes: _ hiL · · A mirror, a first lens, placed in the lens barrel; a lens holder 'The part of the lens barrel is fixed in the lens holder; an image sensing element is located behind the lens barrel; wherein, the lens is fixed in the lens barrel with an adhesive 0PT0CAST 3410, and the image sensing element is made of ceramic Ceramic Leaded Chip Carrier package. 2 · The digital camera module according to item 1 of the scope of patent application, wherein the digital camera lens module further includes a second lens, which is fixed in the lens barrel by the adhesive OPTOCAST 3410 and is located behind the first lens. 3. The digital camera module according to item 2 of the scope of patent application, wherein the first lens is an aspherical glass lens. 4. The digital camera module according to item 3 of the scope of patent application, wherein the second lens is an aspherical plastic lens and its shape is symmetrical to the first lens. 5. The digital camera module according to item 2 or 3 of the scope of patent application, wherein one surface of the first lens is plated with an anti-reflection film (AR-Coating). 6. The digital camera module according to item 5 of the scope of patent application, wherein the anti-reflection film is formed by stacking silicon oxide and two pentoxide films at a distance from each other. 7 · The digital camera module according to item 5 of the declared patent scope, wherein the other surface of the first lens is coated with an IR-Cut Coating. 〇 200531535 6. Scope of patent application 8. The digital camera module described in item 7 of the scope of patent application, wherein the digital camera module further includes a glass sheet fixed in the lens holder and located between the lens barrel and the image sensing element. between. 9. The digital camera module according to item 8 of the scope of patent application, wherein the digital camera module further includes a top cover fixed on the top of the lens barrel. 10. The digital camera module according to item 7 of the scope of patent application, wherein the digital camera module further includes a protective lens fixed on the top of the lens barrel. 11. The digital camera module according to item 1 of the patent application scope, wherein the image sensing element is a CCD (Charge Coupled Device) image sensor. 1 2. The digital camera module according to item 1 of the patent application scope, wherein the image sensing element is a CMOS (complementary metal oxide semiconductor) image sensor. Page 14