CN100501481C

CN100501481C - Lens module for reducing stray light

Info

Publication number: CN100501481C
Application number: CNB2004100522559A
Authority: CN
Inventors: 李俊佑
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: 2004-11-11
Filing date: 2004-11-11
Publication date: 2009-06-17
Anticipated expiration: 2024-11-11
Also published as: CN1773319A

Abstract

The invention discloses a lens module with the function of reducing stray light, comprising: a lens barrel, a casing, and an upper cover, wherein the lens barrel houses a lens group, and the casing includes an accommodating cavity and a bottom plate , the lens barrel is arranged in the accommodating cavity and fixedly connected with the inner side of the bottom plate; the bottom of the upper cover is provided with an opening, and the upper cover is slidably fitted with the lens barrel through the opening; the lens module further includes a bag, the bag Located inside the upper cover, the bag has a channel, the bag channel is opposite to the lens barrel, the bag is filled with liquid, and the bag can be deformed. The lens module with the function of reducing stray light can not only filter the stray light, but also achieve the purpose of scaling the upper cover, thereby ensuring that the lens module has better imaging quality.

Description

Reduce the camera lens module of parasitic light function

[technical field]

The invention relates to a kind of camera lens module that reduces the parasitic light function.

[background technology]

Along with Development of Multimedia Technology, digital image products such as digital camera, digital code camera have the large market demand by people's widespread use.The digital image product is in imaging process, and parasitic light causes dazzles light and ghost can influence image quality, causes the product fraction defective to rise.Usually, dazzle light and ghost, before camera lens, increase by a lid, see also Fig. 1 for what reduce that parasitic light causes, it is to utilize lid 100 to reduce parasitic light, and wherein, A is an incident angle of light, and T is the thickness of this lid 100, B is the camera lens half angle of view, and D is an aperture opening diameter size, is got by mathematical formulae

A=arctan[(D+T*tanB)/T], get D=1.5mm, B=30 °, then obtain curve as shown in Figure 2.

As shown in Figure 2, when T=5mm, the incident light that surpasses more than 40 ° all can be stopped by lid 100, thereby reach the purpose of effective elimination parasitic light; In addition, the T value is bigger, and then lid 100 stops that the ability of parasitic light is stronger.But the T value is big more, be that lid thickness is thicker, it lowers effect that parasitic light enters the camera lens module better, but for the camera lens module that is applied in portable electronic equipments such as mobile phone, because of space in the mobile phone limited, if use traditional digital camera superstructure, tend to be subjected to the restriction in space, can not satisfy the frivolous day by day development of mobile phone.In order to satisfy the mobile phone thickness requirement, the digital camera loam cake is often done very thinly, therefore just has more parasitic light to enter the optical lens module, thereby has reduced image quality.

In view of above shortcoming, provide a kind of volume less, and the camera lens module that can effectively reduce parasitic light is very necessary.

[summary of the invention]

The object of the present invention is to provide a kind of volume less, and can effectively reduce the lens module of parasitic light.

The present invention reduces the camera lens module of parasitic light function, comprising: a lens barrel, and a housing, a loam cake, the inner ccontaining lens combination of described lens barrel, described housing comprises a containing cavity and base plate, this lens barrel is arranged in the containing cavity and with the base plate inboard fixedlys connected; Described loam cake bottom is provided with opening, and this loam cake slidably cooperates with lens barrel by opening; Described camera lens module further comprises a sack, and this sack is located at loam cake inside, and this sack has a passage, and this sack passage is relative with lens barrel, and liquid is housed in the sack, and deformation can take place this sack.

The present invention reduces the camera lens module of parasitic light function by the sack that deformation can take place is set in loam cake, during use, loam cake and lens barrel mutual alignment are strengthened, promptly being equivalent to upper cover thickness increases, when not using, loam cake and lens barrel mutual alignment diminish, thereby promptly can the filtering parasitic light, can reach the purpose of convergent-divergent loam cake again, and then guarantee that this lens module has image quality preferably.

[description of drawings]

Fig. 1 is the cover body structure figure of existing parasitic light function;

Fig. 2 is existing lid thickness and the camera lens half angle of view graph of relation that reduces the parasitic light function;

Fig. 3 is the camera lens module user mode figure that the present invention reduces the parasitic light function;

Fig. 4 is the camera lens module unused state figure that the present invention reduces the parasitic light function;

Fig. 5 is camera lens module that the present invention reduces a parasitic light function bump position synoptic diagram when using;

Fig. 6 is camera lens module that the present invention reduces a parasitic light function bump position synoptic diagram when closing.

[embodiment]

See also Fig. 3 and Fig. 4, the present invention reduces the camera lens module of parasitic light function, and the camera lens module of this reduction parasitic light function comprises a lens barrel 10, and both sides, lens barrel 10 top are provided with loam cake 20, loam cake 20 lens barrel 10 relatively slides up and down, and loam cake 20 and lens barrel 10 are housed in the housing 50.

Lens barrel 10 is a round barrel shape, and the bottom is fixed on housing 50 bottom inside, and lens combination 12 is equipped with in these lens barrel 10 inside, and this lens combination 12 is made up of some eyeglasses, and these some eyeglasses are in order to pool picture with captured image.Lens barrel 10 tops are provided with first glass plate 14, in order to protection lens combination 12, prevent its surface by scratch, in addition, also can plate one deck infrared filtering film on these first glass plate, 14 at least one surfaces, so that filter the infrared ray in the light.

Image Sensor 30 is arranged at lens combination 12 belows, is fixed on simultaneously on housing 50 inside bottom.This Image Sensor 30 can be charge-coupled device (Charge CoupledDevice, call CCD in the following text), perhaps complementarity matal-oxide semiconductor (ComplementaryMetal-Oxide Semiconductor calls CMOS in the following text), it changes the light signal that lens combination 12 is become into electric signal.

Loam cake 20 is located at both sides, lens barrel 10 top, enters lens barrel 10 inside in order to stop more parasitic light.Second glass plate 16 is stamped at these loam cake 20 tops, and its bottom is provided with circular open 24, and this opening 24 slidably cooperates with lens barrel 10, and loam cake 20 two sides are provided with two projections 22.

Sack 26 is circular, and the top is to the passage 27 that is provided with the reverse frustoconic shape between the bottom.This sack 26 is a soft bag, and deformation can take place, and its material is a black plastic.Sack 26 surperficial tool irregular surfaces can make light carry out effective scattering.This sack 26 is loaded on loam cake 20 inside, and passage 27 is relative with lens barrel 10, and the axis of passage 27 and the axis of lens barrel 10 are coincided.These sack 26 tops are fixed on second glass plate 16, and sidewall is fixed on the sidewall of loam cake 20, and the bottom is fixed on the diapire of loam cake 20, and its contact position is fixed by a glue.Liquid 28 is equipped with in sack 26 inside, and this liquid 28 has flowability, and it can be water or other environment protection liquid.Because of liquid 28 tool flowabilities, therefore can make sack 26 under two states, deformation take place, also make liquid 28 be full of whole sack 26 simultaneously.

Loam cake 20 two bottom sides are provided with spring 40, and spring 40 1 ends link to each other with loam cake 20 bottoms, and the other end links to each other with housing 50 inside bottom.

Housing 50 comprises a containing cavity 51, and these containing cavity 51 lateral walls are provided with chute 52, and this chute 52 is L shaped, and its shape is referring to Fig. 5, and this chute 52 matches with projection 22.This housing 50 also comprises a base plate 54, and this base plate 54 is positioned on housing 50 bottom inside, and its printed circuit board (PCB) for being separated with housing 50 also can be the printed circuit board (PCB) integrally formed with housing 50.Base plate 54 is fixedlyed connected with lens barrel 10 bottoms.

During assembling, earlier lens combination 14 is loaded in the lens barrel 10, mixes up defocusedly, fix by a glue.After sack 26 fulls of liquid 28 and the sealing, sack 26 is put in the loam cake 20 and with loam cake 20 fixes by a glue.Lens barrel 10 is set in opening 24 places of loam cake 20, and spring 40 1 ends are fixed in the bottom of loam cake 20 both sides, and Image Sensor 30 is fixed on the housing 50 inboard diapires.Lens barrel 10, loam cake 20 are placed in the housing 50, projection 22 is matched with in the chute 52 of housing 52 again, and the other end with spring 40 is connected on the diapire of housing 50 inboards simultaneously, thereby finishes its assembling process.

When not using, projection 22 is stuck in chute 52 bottoms, and this moment, spring 40 pressurizeds saw also Fig. 4 and Fig. 6.During use, finger can stretch in the chute 52, stirs projection 22, and projection 22 is skidded off from L shaped groove 52 bottoms, makes loam cake 20 under the effect of spring 40, moves up, and when projection 22 peaked at chute 52 bottoms, loam cake 20 stopped to move upward.During loam cake 20 moved upward, its lens barrel 10 relative loam cakes 20 moved down, and the liquid 28 of loam cake 20 inside is under the flowability effect at this moment, deformation takes place, referring to Fig. 3, loam cake 20 strengthens with lens barrel 10 relative axial positions, thereby allows spuious purpose in this liquid filtering light.After finishing shooting process, projection 22 is stirred downwards, projection 22 is stuck in chute again, and loam cake 20 moves down simultaneously, and loam cake 20 becomes near with the relative distance of lens barrel 10, and liquid 28 shapes change, thereby reach the purpose of dwindling camera lens module volume.

Be appreciated that, be provided with spring 40 between loam cake 20 and the housing 50 and also can adopt other elastic device, in addition, between loam cake 20 and the lens barrel 10 thread connecting mode can be set,, change the mutual alignment relation between loam cake 20 and the lens barrel 10 by rotation loam cake 20, also can be in loam cake 20 and lens barrel 10 contact positions, by setting the rubbing surface of the certain friction factor of tool, under certain acting force, change mutual alignment relation between loam cake 20 and the lens barrel 10.

Claims

1. camera lens module that reduces the parasitic light function comprises: a lens barrel, and a housing, a loam cake, the inner ccontaining lens combination of described lens barrel, described housing comprises a containing cavity and base plate, this lens barrel is arranged in the containing cavity and with the base plate inboard fixedlys connected; Described loam cake bottom is provided with opening, and it is characterized in that: this loam cake is slidingly matched by opening and lens barrel; Described camera lens module further comprises a sack, and this bag attachment is located at loam cake inside, and this sack has the passage of a reverse frustoconic, and this sack passage is relative with lens barrel, and liquid is housed in the sack, and this sack under the situation that the relative loam cake of lens barrel slides deformation can take place.

2. the camera lens module of reduction parasitic light function as claimed in claim 1, it is characterized in that: the camera lens module further comprises one second glass plate, this second glass plate is placed on tops, this sack top is fixed on second glass plate, sidewall is fixed on the sidewall of loam cake, and the bottom is fixed on the diapire of loam cake.

3. the camera lens module of reduction parasitic light function as claimed in claim 1 is characterized in that: be provided with elastic device between this loam cake and the housing and connect.

4. the camera lens module of reduction parasitic light function as claimed in claim 3 is characterized in that: this elastic device is a spring.

5. the camera lens module of reduction parasitic light function as claimed in claim 1 is characterized in that: the loam cake both sides are provided with outstanding projection, and the lateral wall of housing containing cavity is provided with chute, and projection can slide up and down in the chute on housing.

6. the camera lens module of reduction parasitic light function as claimed in claim 5 is characterized in that: this chute is L shaped.

7. as the camera lens module of each described reduction parasitic light function in the claim 1 to 6, it is characterized in that: this sack material is a black plastic.

8. the camera lens module of reduction parasitic light function as claimed in claim 1 is characterized in that: this loam cake and lens barrel are by being threaded.

9. the camera lens module of reduction parasitic light function as claimed in claim 1 is characterized in that: this loam cake and lens barrel surface of contact are the rubbing surface of the certain friction factor of tool.

10. the camera lens module of reduction parasitic light function as claimed in claim 1 is characterized in that: this lens barrel top is provided with one first glass plate, is coated with one deck infrared filtering film on this at least one surface of first glass plate.