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Minisize imagery

A wide-angle lens, miniature technology, applied in optical components, optics, instruments, etc., can solve the problems of complex structure, difficult design, processing, and fixing of free-form prisms, and achieve the effects of light weight, stable processing, and cost reduction.

Active Publication Date: 2008-03-12
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the free-form prism structures used in the existing imaging lenses are relatively complex, and it is difficult to design, process, and fix, so there is still a need for further improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0058] As shown in Figure 3, the second embodiment of the miniature imaging wide-angle lens of the present invention includes a first lens 12 of negative diopter, a free-form surface prism 22 of positive diopter, an aperture stop 52, a second lens 32 of positive diopter, A negative diopter third lens 72 , a glass plate 62 and an imaging surface 42 , wherein the second lens 32 and the third lens 72 are combined into a cemented lens 82 . The specific values ​​of each component are listed in the table below:

[0059]

Surface serial number

radius of curvature

(mm)

(Radius of

Curvature)

Distance / thickness(mm)

(Distance / Thickness)

Refractive index

(Nd)

Abbe number

(Vd)

S0

∞

S12

-4.652

1.0

1.5136

57.4

S22

2.199

2.2

S32

4.289

2.5

1.5136

57.4

S42

∞ ...

Embodiment 3

[0071] As shown in Fig. 4, embodiment three of the miniature wide-angle lens of taking pictures of the present invention comprises the first lens 13 of a negative diopter, the free-form surface prism 23 of a positive diopter, an aperture stop 53, the second lens 33 of a positive diopter, A negative diopter third lens 73 , a glass plate 63 and an imaging surface 43 , wherein the second lens 33 and the third lens 73 are combined into a cemented lens 83 . The specific values ​​of each component are listed in the table below:

[0072]

Surface serial number

radius of curvature

(mm)

(Radius of

Curvature)

Distance / thickness(mm)

(Distance / Thickness)

Refractive index

(Nd)

Abbe number

(Vd)

S0

∞

S13

-3.897

1.4

1.5136

57.4

S23

2.076

1.8

S33

3.243

2.39

1.5136

57.4

...

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Abstract

A miniature view-finding wide-angle lens is suitable for image capture products and comprises a first lens of negative diopter, a free curved prism of positive diopter, a second lens of positive diopter and a third lens of negative diopter. Wherein, the free curved prism is arranged in parallel with the first lens. The second lens and the third lens are positioned below the free curved prism and adjacent to an image space. The free curved prism is equivalent to that an aspheric lens coefficients are evaluated on a right-angled prism surface. A lens structure using the present invention can not only reduce total lens length, save cost and decrease common difference but also obtain better optical quality.

Description

technical field [0001] The invention relates to a miniature imaging lens, in particular to a miniature imaging wide-angle lens with a free-form surface suitable for an image capturing device. Background technique [0002] The integration of image capture products and photoelectric technology has become one of the trends in today's technological development. In order to meet the requirements of portability, light, thin, short, and small have become the basic requirements of image capture devices. Regarding the lens form and material selection of the imaging lens, the traditional spherical ground glass lens has more material choices, which is more beneficial for correcting chromatic aberration and has been widely used in the industry. However, when the spherical ground glass lens is used in a situation with a small numerical aperture (FNumber) and a large viewing angle (Wide-angle), it is still difficult to correct aberrations such as spherical aberration and astigmatism. The...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B13/18G02B1/00
Inventor 廖陈成
Owner ASIA OPTICAL CO INC
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