CN2657029Y

CN2657029Y - Ultrathin digital camera lens module

Info

Publication number: CN2657029Y
Application number: CN 200320117730
Authority: CN
Inventors: 蔡明江; 李俊佑; 江宗韦
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2003-11-01
Filing date: 2003-11-01
Publication date: 2004-11-17
Anticipated expiration: 2013-11-01

Abstract

An ultra-thin digital camera module comprises a tube, a lens group, a filter and a Complementary Metal-Oxide Semiconductor (CMOS) image sensor. The lens group comprises four identical aspheric surface lenses in the same plate and is arranged in the tube. The lower part of the tube is a base in which the CMOS image sensor is positioned, and the filter is positioned between the lens group and the CMOS image sensor. The digital camera module can shorten the focal length of the lens without affecting the image quality.

Description

Ultrathin lens module of digital camera

[technical field]

The utility model is about a kind of ultrathin lens module of digital camera, especially about a kind of ultrathin lens module of digital camera that is used for portable electron device.

[background technology]

Along with popularizing of digital products such as digital camera, the digital product pattern is tending towards variation, digital-code camera module design on the portable electron device such as mobile phone, PDA is more and more little, but because its imaging lens module is for taking image quality into account, and CMOS (Complementary Metal-Oxide Semiconductor, the complementarity matal-oxide semiconductor) or CCD (Charge Coupled Device, charge-coupled device) image sensor needs certain receiving angle, so the limit minimum constructive height of general its camera lens module design is about 5mm.

The used eyeglass of general its lens group of ultrathin lens module of digital camera is generally non-spherical surface, see through several pieces eyeglasses and can form lens group, being limited to the eyeglass imaging needs certain incident angle and CMOS or the certain receiving angle of CCD image sensor needs, so lens focus is difficult to compression.Be illustrated in figure 1 as a digital camera imaging synoptic diagram with monolithic lens set.This lens module of digital camera comprises that a lens barrel 1, has the monolithic eyeglass 2 of non-spherical surface, a filter plate 3 and an image sensor 4 (CCD or CMOS), and the focal length of these non-spherical surface lens 2 is A shown in Fig. 1.Its imaging process is as follows: the light of imaging object pools picture after seeing through this eyeglass 2, images on the image sensor 4 through behind the optical filter 3.Its imaging scope is shown in zone 6 among Fig. 2, for obtaining clear authentic image, this imaging scope 6 should be less than the sensing area 5 of image sensor 4, just cover the situation of image sensor 4 sensing areas 5 shown in Fig. 2 for imaging region 6, again because image sensor 4 needs certain receiving angle, so the time focal length can not compress, this moment focal length just be the minimum focus of this lens module of digital camera.As seen, the lens module of digital camera of this kind design makes that because of the limiting altitude of its focal length the portable electron device thickness of using this kind camera lens module is thick partially, influences its portable convenient.

In view of this, provide a kind of focal length to shorten and not influence the ultrathin lens module of digital camera that is applied to portable electron device of image quality real in necessary.

[summary of the invention]

The purpose of this utility model is to provide a kind of ultrathin lens module of digital camera that is applied to portable electron device, and its lens focus can shorten and not influence the quality of image.

In order to realize the purpose of this utility model, the utility model provides a kind of ultrathin lens module of digital camera, comprise a lens barrel, a lens combination, a filter plate and an image sensor, described lens combination is formed by being in conplane four identical non-spherical surface eyeglasses, this lens group is positioned at described lens barrel, the latter half of lens barrel is a base, and image sensor is positioned at this base, and filter plate is between lens combination and image sensor.Four non-spherical surface eyeglasses of the rays pass through lens group of shot object image in the zones of different of image sensor respectively, just can obtain the complete image of shot object after image sensor is handled the imaging signal of zones of different.

Compare existing lens module of digital camera, the utility model lens module of digital camera can shorten focal length and video imaging quality not, thereby makes thinner that digital camera does.

[description of drawings]

Fig. 1 is existing lens module of digital camera figure.

Fig. 2 is the imaging region of eyeglass among Fig. 1 and the sensing region figure of image sensor.

Fig. 3 is the ultrathin lens module of digital camera figure of the utility model.

Fig. 4 is the utility model eyeglass imaging region and image sensor sensing region figure.

Fig. 5 is the lens combination stereographic map of the ultrathin lens module of digital camera of the utility model.

Fig. 6 is a VI-VI place cut-open view among the 5th figure.

Fig. 7 is the used mould die figure of the manufacturing of the used lens combination of the utility model.

Fig. 8 is the construction drawing of the used lens combination of the utility model.

[embodiment]

The ultrathin lens module of digital camera of the utility model is applicable to portable electron devices such as mobile phone with function capable of taking pictures, PDA.

Please refer to shown in Figure 3, the ultrathin lens module of digital camera of the utility model comprises lens barrel 1, lens combination 2, filter plate 3 and CMOS image sensor 4, and described lens combination 2 is formed (as Fig. 5 and shown in Figure 6) by being in conplane four identical non-spherical surface eyeglasses 22.This lens group 2 is positioned at described lens barrel 1, and the latter half of lens barrel 1 is a base 12, and CMOS image sensor 4 is positioned at this base 12, and filter plate 3 is between lens combination 2 and CMOS image sensor 4.

Described lens combination 2 is a plastic lens, can make by the following method, form the die 7 of non-spherical surface eyeglass 22 as shown in Figure 7 earlier in the electroforming mode, this die 7 comprises that an outside surface is the male model benevolence 70 of a convex surface 700 and the mother module core 72 that an outside surface is a concave surface 720.With this male model 70 and this master mold 72 put respectively with two

porous pedestals

80 and 82 in (as shown in Figure 8), form corresponding feature die rectangular array, the plastic plate 90 of the described lens combination 2 of one manufacturing is provided between male model rectangular array and master mold rectangular array, with these sheet material 90 thermoplastics, pressurization, matched moulds, die sinking, promptly form lens matrix, this lens matrix cutting can be obtained described lens combination 2 with non-spherical surface eyeglass.

The focal length of four non-spherical surface eyeglasses 22 on the lens combination 2 is B (as shown in Figure 3), because this non-spherical surface eyeglass 22 is little than the single eyeglass among Fig. 1, so it is under same lens thickness, the focal length of this eyeglass 22 can be compressed to the focal length less than single eyeglass, be that the CMOS image sensor can be more near this lens combination 2, then B＜A.Its imaging process as shown in Figure 3, the light of photo-object converges after by four non-spherical surface eyeglasses 22, by the unwanted light of optical filter 3 filterings, images at last on the CMOS image sensor 4 again.Because light is by four non-spherical surface eyeglass 22 imagings, so it is formed with four imaging regions 6 (as shown in Figure 4) on CMOS image sensor 4, these four imaging regions 6 are covered on the sensing region 5 of CMOS image sensor 4, CMOS image sensor 4 is handled the imaging signal of these four imaging regions 6 more then, filtering repeats light signal, thereby and then light signal is converted to electric signal forms a complete image.This focal length B with lens combination 2 of four non-spherical surface eyeglasses 22 can shorten compared to the focal length A of single eyeglass, but therefore image quality does not reduce, so can pass through the camera lens module of camera lens module of the present utility model, thereby can reduce the thickness of digital camera as ultrathin digital camera.

Be appreciated that lens combination 2 of the present utility model also can have 3 * 3,4 * 4, N * N equal matrix row eyeglass, and the size of N is exceeded with the manufacturing technology ability.Focal length that like this can bigger compression lens combination 2 obtains extra-thin lens module of digital camera.

Claims

1. ultrathin lens module of digital camera, comprise: a lens barrel, a lens combination, a filter plate and an image sensor, it is characterized in that: described lens combination is made up of several identical non-spherical surface eyeglasses that are formed on the same plane, described lens combination is positioned at described lens barrel, the latter half of lens barrel is a base, image sensor is positioned at this base, and filter plate is between lens combination and image sensor.

2. ultrathin lens module of digital camera as claimed in claim 1 is characterized in that: described lens combination is the plastic lens group.

3. ultrathin lens module of digital camera as claimed in claim 2 is characterized in that: eyeglass is arranged as rectangular array on the described lens combination.

4. ultrathin lens module of digital camera as claimed in claim 3 is characterized in that: described filter plate is an infrared filter.

5. ultrathin lens module of digital camera as claimed in claim 3 is characterized in that: described filter plate is the ultraviolet filter plate.

6. ultrathin lens module of digital camera as claimed in claim 4 is characterized in that: described image sensor is complementarity matal-oxide semiconductor (CMOS) image sensor.

7. ultrathin lens module of digital camera as claimed in claim 4 is characterized in that: described image sensor is charge-coupled device (CCD) image sensor.