CN2672676Y

CN2672676Y - Digital camera lens module

Info

Publication number: CN2672676Y
Application number: CN 200320118683
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: 2003-11-24
Filing date: 2003-11-24
Publication date: 2005-01-19
Anticipated expiration: 2013-11-24

Abstract

The utility model discloses a digital camera lens module, comprising a lens module, a reflexion unit, and an optical receiver, wherein, the lens module and the optical receiver are arranged side by side, the reflexion unit is provided under the lens module and the optical receiver, and the reflexion unit reflects the light emitted from the lens module to the optical receiver. Compared with the exsiting digital camera lens module that each component displays simply linearly, adopting the structure can decrease the thickness of digital camera lens module and the optical aberration of image-forming.

Description

The digital camera lens module

[technical field]

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

[background technology]

At present, along with CPU (Central Processing Unit, central processing unit) the significantly improving of performance, image processing techniques develops rapidly, mobile phone, PDA (Personal Digital Assistant, personal digital assistant) and the equal higher Digital Image Processing ability of tool of electronic installation such as computing machine, make that the digital camera lens module as image-pickup device is also developed rapidly thereupon.Along with portable electron devices such as mobile phone, PDA trend toward miniaturization day by day, the integral thickness of digital camera lens module also requires to obtain improvement simultaneously.

The user wishes that usually its camera lens zooming range of holding portable electron device capable of taking pictures is wide more good more, varifocal numerical camera mould adopts several lens to constitute optical lens system usually, during shooting by changing between each lens apart from the focal length that changes this optical system, to reach the purpose of zoom.As shown in Figure 1, existing digital camera lens module mainly comprises lens module 10 (as the non-spherical lens group), optical filter 20, optical pickup apparatus 40CMOS ((Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)) or CCD (Charge Coupled Device, and printed circuit board (PCB) 50 the Charged Coupled Device sensor)), wherein, lens module 10 makes the light that arrives optical pickup apparatus 40 have higher light intensity in order to converge light.But optical filter 20 filtering part incident lights make imaging effect preferable.The light signal that optical pickup apparatus 40 will pass optical filter 20 converts electric signal to, and printed circuit board (PCB) 50 is handled the electric signal that optical pickup apparatus 40 produces.Should existing digital camera lens module be simple orthoscopic light path design, the focal length place that optical pickup apparatus 40 is positioned at lens module 10 just can be the optimal imaging effect.Though this kind design has enlarged the scope of lens focus, has increased lens length and weight, is not easy to be applied to portable electron device, reduce for making camera module thickness, certainly will design especially and increase difficulty at lens module 10.

Therefore, provide a kind of and the optical path direction turnover is changed, whole light path can be elongated, thereby reduce digital camera lens module thickness, and the digital camera lens module that utilizes the diffraction optics design to reduce imaging aberration is necessity in fact by reflection unit.

[summary of the invention]

The purpose of this utility model is to provide a kind of and by reflection unit the optical path direction turnover is changed, and whole light path can be elongated, thereby reduce digital camera lens module thickness, and utilize the diffraction optics design to reduce the digital camera lens module of imaging aberration.

In order to realize the purpose of this utility model, the utility model provides a kind of digital camera lens module, comprise lens module, reflection unit and optical pickup apparatus, wherein, lens module and optical pickup apparatus are positioned at the homonymy of reflection unit, are incident to optical pickup apparatus through the light signal that the lens module transmits after the reflection unit reflection.

Being simple orthoscopic with each parts of existing digital camera lens module arranges and compares, the lens module of the utility model digital camera lens module changes optical path direction by the reflection unit turnover, elongated whole light path, and need not the lens module is designed especially, thereby reduce lens module design difficulty, structure arrangement is more flexible; And a side of reflection unit is a non-spherical surface, thereby has shortened the distance between lens module and optical pickup apparatus, and digital camera lens module thickness is reduced; In addition, this lens module is a diffraction optical lens, can guarantee the corresponding imaging aberration that reduces on the imaging effect.

[description of drawings]

Fig. 1 is the structural representation of existing digital camera lens module.

Fig. 2 is the structural representation of the utility model digital camera lens module.

[embodiment]

As shown in Figure 2, the utility model digital camera lens module comprises lens module 1, infrared cut-off light filtering films 2, reflection unit 3, optical pickup apparatus 4 (being cmos sensor or ccd sensor in the present embodiment) and printed circuit board (PCB) 5.

Lens module 1 can be designed to reflection unit 3 one-body molded, and it comprises a diffraction curved surface 10 and a non-spherical surface 12, and this diffraction curved surface 10 can be a grating, and it can be made by photo-engraving process or holography method, is used for aberration correction.

Printed circuit board (PCB) 5 is positioned at optical pickup apparatus 4 tops, be electrically connected with optical pickup apparatus 4, and this printed circuit board (PCB) 5 and optical pickup apparatus 4 is arranged side by side with lens module 1.Reflection unit 3 is positioned at the below of lens module 1 and optical pickup apparatus 4, and its light with 1 incident of lens module reflexes in the optical pickup apparatus 4.

Reflection unit 3 is the Dove prism of a tool reflectance coating, and it comprises end face 31, left surface 32 and right flank 33, and reflection unit 3 roughly be arranged in parallel with lens module 1.Wherein, left surface 32 is relative with lens module 1, and right flank 33 is a non-spherical surface, and it is relative with optical pickup apparatus 4.Infrared cut-off light filtering films 2 is plated on the end face 31, and left surface 32 and right flank 33 are coated with first total reflection film 321 and second total reflection film 331 at its outside surface respectively.

During use, after the light of object scene converges through lens module 1, pass infrared cut-off light filtering films 2, behind first total reflection film 321 of the left surface 32 of reflection unit 3 by total reflection to the second total reflection film 331, be incident upon end face 31 again after 331 total reflections of second total reflection film, the infrared cut-off light filtering films 2 on the end face 31 can stop the infrared ray of incident light to pass through, thereby avoids producing noise because of the infrared ray interference when normal photographing, more accurate when therefore, guaranteeing the image color reduction.Light transmission is to optical pickup apparatus 4 then, and the light signal that optical pickup apparatus 4 will receive is converted to electric signal, promptly obtains the digital picture signal of object scene after printed circuit board (PCB) 5 is handled.Through behind this two total reflection film, the change of the optical path direction of incident ray is roughly 180 degree, thereby dwindles the digital camera integral thickness.

Be appreciated that, the reflection unit 3 of the utility model digital camera lens module not only is confined to Dove prism, for the light that transmits from lens module 1 is reflexed to the optical pickup apparatus 4, also can adopt a plane mirror, or the reflection unit that other can reflection ray is realized.For making the camera module obtain the optimal imaging effect, can be mutually certain angle between lens module 1, optical pickup apparatus 4 and the reflection unit 3.

Claims

1. digital camera lens module, comprise lens module, reflection unit, printed circuit board (PCB) and optical pickup apparatus, it is characterized in that: this lens module is provided with diffraction optical assembly, this optical pickup apparatus and lens module are positioned at the homonymy of reflection unit, are incident to optical pickup apparatus through the light signal that the lens module transmits after the reflection unit reflection.

2. as 1 described digital camera lens module of claim the, wherein, described reflection unit is a Dove prism, and it comprises at least one non-spherical surface.

3. as 1 described digital camera lens module of claim the, wherein, described diffraction optical assembly is a grating, and this grating comprises diffraction curved surface and non-spherical surface.

4. as 1 described digital camera lens module of claim the, wherein, this digital camera lens module further comprises infrared cut-off light filtering films, between lens module and reflection unit.

5. as 2 described digital camera lens modules of claim the, wherein this Dove prism comprises left surface, right flank and end face, and left surface is relative with the lens module, and right flank is a non-spherical surface, and it is relative with optical pickup apparatus.

6. as 5 described digital camera lens modules of claim the, wherein, described infrared cut-off light filtering films is plated in the end face of reflection unit.

7. as 5 described digital camera lens modules of claim the, wherein, the left surface of described reflection unit and right flank are coated with total reflection film at its outside surface respectively.

8. as 1 described digital camera lens module of claim the, wherein, described lens module and optical pickup apparatus are arranged side by side.

9. as 1 described digital camera lens module of claim the, wherein, described lens module and reflection unit be arranged in parallel.

10. as 1 described digital camera lens module of claim the, wherein, described optical pickup apparatus is a cmos sensor.