Focus-fixed lens

A fixed-focus lens and negative lens technology, applied in the field of fixed-focus lenses, can solve problems such as difficult to achieve balance, achieve good image quality, low cost, and avoid excessive system length

Inactive Publication Date: 2008-12-10
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the fixed-focus lens design has been developed for a period of time, with the increase of the pixels of the photosensitive element, it is alwa...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0057] Table 1 lists the parameters of each surface of the optical system of the fixed-focus lens in turn, wherein STO. is the aperture stop, and FS is the filter. S11 and S12 denote the object end surface and imaging end surface of the first positive lens, S21 and S22 respectively denote the object end surface and imaging end surface of the second negative lens, S31 and S32 respectively denote the object end surface and imaging end surface of the third crescent positive lens , S41 and S42 represent the object end surface and the imaging end surface of the fourth negative lens, respectively.

[0058]

[0059] Other optical properties of the fixed-focus lens of the first embodiment are listed in Table 2:

[0060]

[0061] It can be seen from Table 2 that the f12 / f parameter value of the fixed-focus lens is 1.608, which meets the condition (1). R S32 The / f parameter value is 0.17, which meets the condition (2). The parameter value of D23 / L is 0.13, which meets the cond...

no. 2 example

[0070] The second embodiment discusses the case where the curvature of the object end surface of the second negative lens is designed to be a negative value. Table 5 sequentially lists the parameters of each surface of the optical system of the fixed-focus lens of the second embodiment, wherein STO. is the aperture stop, and FS is the filter. S11 and S12 denote the object end surface and imaging end surface of the first positive lens, S21 and S22 respectively denote the object end surface and imaging end surface of the second negative lens, S31 and S32 respectively denote the object end surface and imaging end surface of the third crescent positive lens , S41 and S42 represent the object end surface and the imaging end surface of the fourth negative lens, respectively.

[0071]

[0072] Other optical characteristics of fixed focal length lenses are listed in Table 6:

[0073]

[0074] It can be seen from Table 6 that the f12 / f parameter value of the fixed-focus lens is ...

no. 3 example

[0081] The curvature of the object end surface of the second negative lens in this embodiment is not only negative, but also much smaller than that in the second embodiment. Table 9 sequentially lists the parameters of each surface of the optical system of the fixed-focus lens of the third embodiment, wherein STO. is the aperture stop, and FS is the filter. S11 and S12 denote the object end surface and imaging end surface of the first positive lens, S21 and S22 respectively denote the object end surface and imaging end surface of the second negative lens, S31 and S32 respectively denote the object end surface and imaging end surface of the third crescent positive lens , S41 and S42 represent the object end surface and the imaging end surface of the fourth negative lens, respectively.

[0082]

[0083] Other optical characteristics of the fixed focal length lens are listed in Table 10:

[0084]

[0085] It can be seen from Table 10 that the f12 / f parameter value of the f...

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Abstract

The invention discloses a fixed-focus lens which comprises an aperture stop, a first positive lens, a second negative lens, a third meniscus positive lens and a fourth negative lens; wherein, the aperture stop, the first positive lens, the second negative lens, the third meniscus positive lens and the fourth negative lens are arranged on an optical axis from an objective end to an imaging end in sequence. The fixed-focus lens satisfies the requirements as follows: RS32/f is more than 0.1 and less than 0.3, wherein, the f is the effective focal length of the fixed-point lens, and the RS32 is the curvature radius of the surface of the third meniscus positive lens near the imaging end. The fixed-focus lens of the invention limits the effective focal length to avoid the overlength of the total length of the system through setting the proper effective focal length, and thereby the favorable picture quality and the adequate imaging height are provided.

Description

technical field [0001] The invention relates to a lens, in particular to a fixed-focus lens. Background technique [0002] In recent years, with the rapid development of digital camera devices, the pixels of photosensitive elements have also increased accordingly, and the design of optical lenses on digital cameras has also become more and more important. General camera lenses can be divided into fixed-focus lenses and zoom lenses. The characteristics of fixed-focus lenses are relatively simple, and can provide good image quality for digital cameras at a relatively low cost. [0003] Although the fixed-focus lens design has been developed for a period of time, with the increase of the pixels of the photosensitive element, it is always difficult to achieve a balance in the imaging range, imaging ratio and total length of the common fixed-focus lens. space to meet various considerations of use. [0004] Therefore, how to reduce the cost and total length of the optical system...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B9/34
Inventor 廖陈成
Owner ASIA OPTICAL CO INC
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