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Three-glasses lens type shooting lens

A lens and lens technology, applied in optical components, optics, instruments, etc., can solve the problems of long focal length, large scanner size, and unsatisfactory image quality of two-lens imaging lens

Inactive Publication Date: 2009-01-28
E PIN OPTICAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are one element lens, two lens groups or lens elements, three lens groups or lens elements, or multi-lens groups or lens elements in the imaging lens and other different structural types, wherein, the single-mirror imaging lens such as: US6,560,037 it is to use plano-convex lens (plan o-convex lens), US6,724,545 it is to use Fresnel lens (Fresnellens) etc., but single plano Convex lenses have insufficient ability to compensate for aberrations, while Fresnel lenses have the disadvantage of insufficient resolution
[0004] Two-lens type imaging lens such as US5,677,798, US6,934,094, US6,097,551, US6,577,456, US6,747,805, US6,515,809, etc., wherein, US5,677,798, US6,934,094 and US6,097,551 etc., its structure The object side is sequentially composed of a negative diopter first lens element and a positive diopter second lens element. This arrangement can obtain a back focus and aberration compensation capability is better than that of the single lens type, but its focal length Longer, larger scanner size
The structures of US6,577,456, US6,747,805, and US6,515,809 etc. provide smaller focal lengths to reduce the size of the scanner or make it easier to manufacture; question

Method used

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  • Three-glasses lens type shooting lens
  • Three-glasses lens type shooting lens
  • Three-glasses lens type shooting lens

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0041] Please refer to Figure 1 and Figure 2A-2C, which are the structure and optical path schematic diagram of the first embodiment, and longitudinal spherical aberration diagrams of three different aberration diagrams (wavelengths of 440nm, 537.5613nm, and 656.2725nm) (Longitudinal spherical aberration), Astigmatic field curvature, and distortion.

[0042] The following table (1) lists the optical surface number (surface number) in order from the object side of the first embodiment, each optical surface type (Type), and each optical surface on the optical axis. The radius of curvature R (unit: mm) of the surface (the radius of curvature R), the distance D (distance, unit: mm) between the optical surfaces on the optical axis, and the lens material.

[0043] Table I)

[0044]

[0045] The following table (2) lists the coefficients of each optical surface:

[0046] Table II)

[0047] Aspheric surface is number

5th optical surface

K=-10.4770783549

...

no. 2 example

[0055] Please refer to FIG. 1 and FIGS. 3A-3C , which are schematic diagrams of the structure and optical path of this embodiment, and three different aberration diagrams, respectively.

[0056] The following table (3) respectively lists the numbers of the optical surfaces sequentially numbered from the object side in this embodiment, the type of each optical surface, the radius of curvature R (unit: mm) of each optical surface on the optical axis, and each optical surface on the optical axis. The distance D (unit: mm) between the surfaces is related to the material of the lens.

[0057] Table (3)

[0058]

[0059] The following table (four) lists the numbers of each optical surface with aspheric surface:

[0060] Table (4)

[0061] Aspheric surface is number

5th optical surface

K=-10.9150547738645

A=-7.99720838306722e-005 B=2.76476046300913e-005

C=-4.44533123062e-007

D=-1.31628563633304e-008 E=9.32486208888918e-028

6th opti...

no. 3 example

[0068] Please refer to FIG. 1 and FIGS. 4A-4C , which are schematic diagrams of the structure and optical path of the third embodiment, and three different aberration diagrams, respectively.

[0069] The following table (5) respectively lists the numbers of the optical surfaces sequentially numbered from the object side in this embodiment, the type of each optical surface, the radius of curvature R (unit: mm) of each optical surface on the optical axis, and each optical surface on the optical axis. The distance D (unit: mm) between the surfaces is related to the material of the lens.

[0070] Table (5)

[0071]

[0072]

[0073] The following table (6) lists the numbers of each optical surface with aspheric surface:

[0074] Table (6)

[0075] Aspheric surface is number

5th optical surface

K=-8.27078610485597

A=-0.000432498893854793 B=3.27532455298279e-005

C=-9.05187852841266e-007

D=-2.45414794540681e-008 E=-2.04218788052446e-02...

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Abstract

The invention provides a three-eyeglass typed camera lens which is used for a BFL image reading device with short rear focus length; in the same optical axis and at the object side, the camera lens sequentially comprises a dual-convex surface typed first lens part with positive dioptre, a dual-concave surface typed second lens part with negative dioptre, and a crescent-shaped third lens part with positive dioptre; the camera lens meets the optical conditions as follows: BFL / EFL is less than 0.7 and the like, wherein, the BFL is the rear focus length and the EFL is the effective focus length; furthermore, at least an optical surface out of the second lens or the third lens is a non-spherical surface; therefore, the volume of a scanner is effectively reduced and the same imaging clearness is maintained so as to form the camera lens which can compensate various phase differences and has low processing cost and is easy to be processed, so as to be applied to the image reading devices such as scanner and the like.

Description

technical field [0001] What the present invention relates to is a kind of three-lens type imaging lens, especially for the image sensor (Image sensor) of image reading device such as CCDM (Charge Coupled Image Sensor Module), CISM (Contact Image Sensor Module) or CMOSM ( Complementary metal oxide semiconductor image sensor module), etc., and provide an optical imaging lens composed of three lens elements (lens elements), capable of compensating various aberrations, and having a short back focal length BFL (back focal length). Background technique [0002] Image reading device such as scanner (Scanner) or image projector (Projector), etc., its main working method is: a light source is provided on the scanner or image projector to emit scanning light, when the light irradiates on the object and passes through After the surface of the object is reflected, an imaging lens is required to focus the light reflected by the object onto the image sensor. For different types of scanner...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B9/14G02B1/02
Inventor 徐三伟吴汉中王上立庆祖林
Owner E PIN OPTICAL IND