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Wide-angle double-lens optical taking lens

An optical and lens technology, applied in the field of optical imaging lens, can solve the problems of lens length reduction, shrinkage, and field of view increase, so as to achieve the effect of reducing length and improving applicability

Inactive Publication Date: 2011-05-25
E PIN OPTICAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the total length of the optical imaging lens disclosed in these patents should be further reduced; for the larger field of view design required by users, for example, US2008 / 0030875 uses a combination of positive and negative diopters, US20030 / 0197956 uses a combination of negative-positive diopters, US5,835,288 uses a combination of biconcave and biconvex lenses, and Japanese patents JP08-334684 and JP2005-107368 use a combination of positive or negative-positive diopters to increase the field of view; or For example, Japanese Patent Publication No. JP2004-177976, European Patents EP1793252 and EP1793254, U.S. Patents US6,876,500, US2004 / 0160680, US7,088,528, Taiwan Patent TWI266074, etc. use the combination of positive and positive diopters to reduce the length of the lens

Method used

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  • Wide-angle double-lens optical taking lens
  • Wide-angle double-lens optical taking lens
  • Wide-angle double-lens optical taking lens

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0040] Please refer to image 3 , 4, which are respectively the optical path structure schematic diagram of the first embodiment of the optical imaging lens 1 of the present invention, the imaging spherical aberration (spherical aberration), the field curvature (field curvature) and the imaging distortion (distortion) diagram;

[0041] The following table (1) lists the optical surface number (surface number) numbered sequentially from the object side to the image side, the radius of curvature R (unit: mm) (the radius of curvatureR) of each optical surface on the optical axis, and the optical surface number. The distance between the surfaces on the axis d (unit: mm) (the on-axis surface spacing), the refractive index of each lens (N d ), the Abbe’s number of each lens (Abbe’s number)v d .

[0042] Table I)

[0043]

[0044] *Aspherical surface

[0045] In Table (1), the optical surfaces (Surf) marked with * are aspheric optical surfaces, Surf 1 and Surf2 represent the ob...

no. 2 example

[0053] Please refer to Figure 5 , 6, which are respectively the schematic diagram of the optical path structure of the second embodiment of the optical imaging lens 1 of the present invention, the spherical aberration of imaging, the distortion diagram of field curvature and imaging;

[0054] The following table (3) lists the number of optical surfaces sequentially numbered from the object side to the image side, the radius of curvature R of each optical surface on the optical axis, the distance d between each surface on the optical axis, and the refractive index of each lens ( N d ), the Abbe number v of each lens d .

[0055] Table (3)

[0056]

[0057] *Aspherical surface

[0058] The following table (4) lists the various coefficients of the aspheric surface formula (6) of each optical surface:

[0059] Table (4)

[0060]

[0061] In this embodiment, the first lens 11 utilizes the refractive index N d1 is 1.566, Abbe's number v d1 Made of glass material of 24...

no. 3 example

[0066] Please refer to Figure 7 , 8, which are respectively the schematic diagram of the optical path structure of the third embodiment of the optical imaging lens 1 of the present invention, the spherical aberration of imaging, the distortion diagram of field curvature and imaging;

[0067] Table (5)

[0068]

[0069] *Aspherical surface

[0070] The above list (5) lists the number of optical surfaces sequentially numbered from the object side to the image side, the radius of curvature R of each optical surface on the optical axis, the distance d between each surface on the optical axis, and the refractive index of each lens ( N d ), the Abbe number v of each lens d .

[0071] The following table (6) lists the various coefficients of the aspheric surface formula (6) of each optical surface:

[0072] Table (6)

[0073]

[0074] In this embodiment, the first lens 11 utilizes the refractive index N d1 is 1.537, the Abbe number v d1 Made of glass material of 63.5; th...

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Abstract

The invention discloses a wide-angle double-lens optical taking lens, comprising an aperture stop, a first lens and a second lens which are arranged along an optical axis from an object side to an image side. The first lens has positive dioptre, and is a concavo-convex aspheric lens; the has positive dioptre and is a meniscus-shaped aspheric lens, wherein the convex surface of the second lens is facedto the object side, and the concave surface is faced to the image side; at least one inflexion point is in the optical effective range on the image side of the second lens from the lens centre to thelens edge, which ensures that the second lens gradually transforms from positive dioptre to negative dioptre. The optical taking lens meets conditions as follows: 2 omega larger than or equal to 70 degrees; wherein bf represents the focus after the taking lens, TL represents the distance from the aperture stop to the image surface, 2 omega represents maximal visual angle. The invention can achieve the wide-angle effect, increase the image taking angle of a mini-camera and a mobile phone, can further reduce the length of the lens by the combination of two lens, and can meet the using requirement of the thin mini-camera and the mobile phone.

Description

technical field [0001] The invention relates to a wide-angle optical imaging lens, especially a lens for small cameras or mobile phones using image sensors such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), and provides a A wide-angle, short overall length and low-cost optical imaging lens composed of two lenses. Background technique [0002] With the advancement of technology, electronic products are constantly developing towards the direction of thin, light, small and multi-functional, and electronic products such as: digital still camera (Digital Still Camera), computer camera (PC camera), network camera (Network camera), mobile phone (Mobile phones) and other devices that already have imaging devices (lenses), and even devices such as personal digital assistants (PDAs) also have the need to add imaging devices (lenses); Not only need to have good imaging quality, but also need to have smaller volume (length) and lower cost. Due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/18G02B9/06
Inventor 施柏源
Owner E PIN OPTICAL IND