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Imaging lens having three-lens configuration, camera module, and portable terminal equipment

A camera lens and lens technology, applied in the direction of optical components, optics, instruments, etc., can solve problems such as telecentricity deterioration

Inactive Publication Date: 2010-07-21
TIANJIN OFILM OPTO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the overall length of the lens system is shortened in the case of the configuration of the middle stop, the incident angle of the chief ray on the imaging surface becomes larger, and the telecentricity deteriorates.

Method used

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  • Imaging lens having three-lens configuration, camera module, and portable terminal equipment
  • Imaging lens having three-lens configuration, camera module, and portable terminal equipment
  • Imaging lens having three-lens configuration, camera module, and portable terminal equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0307] In the imaging lens according to Example 1, both surfaces of the first lens L1, the second lens L2, and the third lens L3 are aspherical. exist Figure 15 In the basic lens data of (A), the radius of curvature of these aspheric surfaces represents the numerical value of the radius of curvature near the optical axis. exist Figure 15 (B) Among the numerical values ​​expressed as aspherical data, the symbol "E" indicates that the value immediately following it is a "power exponent" with base 10, indicating that the value expressed by the exponential function with base 10 is multiplied by "E". "The value of the front surface. For example, if it is "1.0E-02", it means "1.0×10 -2 ".

[0308] Each coefficient B of the formula of the aspheric surface shape represented by the following formula (A) is written as aspheric surface data n , The value of KA. More specifically, Z represents the length (mm) of a perpendicular line drawn from a point on the aspheric surface at a ...

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PUM

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Abstract

An imaging lens includes: in order from an object side, an aperture diaphragm; a first lens of a positive lens having a convex surface on the object side; a second lens of a meniscus lens having a concave surface on the object side; and a third lens. The imaging lens satisfies: f / f 3 <0.95 and BR 2 <0. BR 2 satisfies BR 2 =A / D 4 , A represents a distance from a vertex position on a object-side surface of the second lens and on an optical axis to a position on a image-side surface of the second lens through which a light ray passes toward a corner of an image height, provided that a traveling direction of the light ray is taken as appositive direction, and D 4 represents a center thickness of the second lens. f represents a focal length of the imaging lens, and f 3 represents a focal length of the third lens.

Description

[0001] This case is a divisional application of the application dated November 8, 2007, the application number is 200710169294.0, and the invention name is "3-piece imaging lens, camera module, and mobile terminal equipment". technical field [0002] The present invention relates to an imaging lens for forming an optical image of a subject on an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and a camera for converting the optical image formed by the imaging lens into an imaging signal A module, and a suitable fixed-focus imaging lens such as a mobile phone with a camera or a personal digital assistant (PDA: Personal Digital Assistance) that mounts the imaging lens and performs photography. Background technique [0003] In recent years, the extreme miniaturization and high pixelation of imaging elements such as CCD and CMOS are progressing. Therefore, the main body of the imaging device and the lens mounted thereon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00
Inventor 野田隆行
Owner TIANJIN OFILM OPTO ELECTRONICS CO LTD