CN2657027Y

CN2657027Y - Digital camera module

Info

Publication number: CN2657027Y
Application number: CN 200320117145
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: 2003-10-13
Filing date: 2003-10-13
Publication date: 2004-11-17
Anticipated expiration: 2013-10-13

Abstract

A digital camera module comprises a tube, optical components and a light receiving device. Wherein, the optical components comprises a gradient index lens, the optical components are fixed at the upper part of the tube, and the light receiving device is positioned at the lower part in the tube and with a fixed thickness, which causes the assembled light receiving device to be at the focal point of the gradient index lens. The structure can simplify the structure of the digital camera module and shorten the assembly working hours.

Description

Numerical camera mould

[technical field]

The utility model is about a kind of numerical camera mould, especially about a kind of numerical camera mould that is used for mobile phone or PDA portable electronic equipments such as (personal digital assistants).

[background technology]

As everyone knows, image quality is extremely important for a camera module, obtains the optimal imaging effect in order to make the camera module, and the optical pickup apparatus of camera module must be positioned at the focus place of camera lens module.

Please refer to shown in Figure 1ly, existing numerical camera mould mainly comprises lens module 10, sleeve 20 and optical pickup apparatus 30.Wherein, fixing has a plurality of lens 102, one first screw threads 101 to be positioned at the outside surface of lens module 10 in the lens module 10, and it can match with second screw thread 202 on being positioned at sleeve 20 inside surfaces, and lens module 10 is immobilizated in the sleeve 20.Lens module 10 is in order to converge light, makes the light that arrives optical pickup apparatus 30 have higher light intensity, is immobilizated in the light signal that optical pickup apparatus 30 in the sleeve 20 will pass lens module 10 and converts electric signal to.The focus that optical pickup apparatus 30 is positioned at lens module 10 is sentenced and is the optimal imaging effect, therefore numerical camera mould must have the focusing operation in assembling process, by test board monitoring module, adjust the relative position of first screw thread 101 and second screw thread 202, thereby adjust the distance of lens module 10 and optical pickup apparatus 30, make this optical pickup apparatus 30 be positioned at the focus place of lens module 10, afterwards with lens module 10 and sleeve 20 relative fixed.But this focusing operation is very time-consuming.In addition, this numerical camera mould complex structure is not easy to assembling.

At the problems referred to above, be necessary to provide a kind of simple in structure, assembling short numerical camera mould in man-hour.

[utility model content]

The purpose of this utility model is to provide a kind of simple in structure, assembling short numerical camera mould in man-hour.

In order to realize the purpose of this utility model, the utility model provides a kind of numerical camera mould, comprise lens barrel, optical module and optical pickup apparatus, wherein, optical module comprises a gradual index lens, and optical module is immobilizated in the top in the lens barrel, and optical pickup apparatus is positioned at the below of lens barrel, the thickness of this optical module is a fixed value, makes optical pickup apparatus after the assembling be positioned at the focus place of gradual index lens.

Compare the focusing operation of existing numerical camera mould, the thickness of the optical module of the utility model numerical camera mould is the fixed value that can calculate, this fixed value makes the optical pickup apparatus of the numerical camera mould after the assembling be positioned at the focus place of gradual index lens just, makes numerical camera mould be the state of imaging effect the best.The utility model assembly that numerical camera mould comprises is less, and is simple in structure, is convenient to assembling, makes assembling shortening in man-hour.

[description of drawings]

Fig. 1 is the structural representation of existing numerical camera mould.

Fig. 2 is the structural representation of the utility model numerical camera mould.

[embodiment]

Please refer to shown in Figure 2ly, the utility model numerical camera mould comprises lens barrel 1, optical module 2 and optical pickup apparatus 3, and optical module 2 is immobilizated in the top in the lens barrel 1, and optical pickup apparatus 3 is positioned at the below of lens barrel 1.

Optical module 2 comprises gradual index lens (Gradient Index Lens) 21 and locating device 23.Gradual index lens 21 is to be made by non-homogeneous optical material, for example tantalum silicate glass, titan silicate glass etc., and the form by the volume coordinate function constantly changes its refractive index in its inside.In the present embodiment, gradual index lens 21 is a right cylinder, refractive index is along being parabolic distribution perpendicular to optical axis direction, when light passes through gradual index lens 21, light transmits by sinusoidal wave mode in gradual index lens 21, thereby the length of control gradual index lens 21, parallel incident ray is converged at a bit behind gradual index lens 21, for example, the length of gradual index lens 21 can adopt P/4, wherein, P is the Cycle Length of gradual index lens 21, makes focus be positioned at gradual index lens 21 just near on the end face of optical pickup apparatus one end.Gradual index lens has advantages such as volume is little, and geometric configuration is simple, thereby is widely used in optical communication system.Locating device 23 is positioned at gradual index lens 21 belows, and its upper surface contacts with the lower surface of gradual index lens 21, and this locating device 23 can be one-body molded with lens barrel 1, in order to location gradual index lens 21.In the present embodiment, the length summation of the thickness of this locating device 23 and gradual index lens 21 equals gradual index lens 21 4/one-period length, so that just drop on the optical pickup apparatus 3 through the light focus that gradual index lens 21 converges.

Optical pickup apparatus 3 is positioned at the below of the locating device 23 of optical module 2, and the lower surface of locating device 23 contacts with the upper surface of optical pickup apparatus 3.This optical pickup apparatus 3 can be a CMOS (Complementary Metal-Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)) sensor or a C CD (Charge Coupled Device, charge-coupled image sensor) sensor.

During assembling, at first make gradual index lens 21 place the upper surface of lens barrel 1 interior locating device 23, can be on it by a top cover or otherwise, this gradual index lens 21 is immobilizated in the lens barrel 1, again optical pickup apparatus 3 is placed the below of lens barrel 1 interior locating device 23, its upper surface contacts with the lower surface of locating device 23 just, gluing between the sidewall of optical pickup apparatus 3 and lens barrel 1 is fixed getting final product, and then the numerical camera mould assembling finishes.

During use, after the light of object scene converges through gradual index lens 21, pass the through hole (figure does not show) of locating device 23, be incident upon on the optical pickup apparatus 3, optical pickup apparatus 3 is converted to the light signal that receives the electric signal of object scene.Because the optical pickup apparatus 3 of the numerical camera mould after the assembling is positioned at the focus place of gradual index lens 21 just, thereby when assembling, need not to focus, can make numerical camera mould be the optimal imaging effect, also can reduce a plurality of lens operations in assembling location simultaneously.

Claims

1. numerical camera mould, comprise lens barrel, optical module and optical pickup apparatus, wherein, optical module is immobilizated in the top in the lens barrel, optical pickup apparatus is positioned at the below of lens barrel, it is characterized in that: this optical module comprises a gradual index lens, and the thickness of this optical module is a fixed value, makes optical pickup apparatus after the assembling be positioned at the focus place of gradual index lens.

2. numerical camera mould as claimed in claim 1 is characterized in that: described optical module further comprises a location device.

3. numerical camera mould as claimed in claim 2 is characterized in that: described locating device can be one-body molded with lens barrel.

4. numerical camera mould as claimed in claim 3 is characterized in that: the upper surface of described locating device contacts with the lower surface of gradual index lens.

5. numerical camera mould as claimed in claim 4 is characterized in that: the lower surface of described locating device contacts with the upper surface of optical pickup apparatus.

6. numerical camera mould as claimed in claim 5 is characterized in that: described gradual index lens is a right cylinder.

7. numerical camera mould as claimed in claim 6 is characterized in that: the refractive index of described gradual index lens is along being parabolic distribution perpendicular to optical axis direction.

8. numerical camera mould as claimed in claim 7 is characterized in that: the length summation of described gradual index lens and locating device equals gradual index lens four/one-period length.

9. numerical camera mould as claimed in claim 1 is characterized in that: described optical pickup apparatus is cmos sensor or ccd sensor.