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camera lens

A camera lens and lens technology, applied in the field of camera lenses, can solve the problems of insufficient brightness of Fno ≥ 2.4, insufficient shape of the fourth lens, insufficient shape of the second lens, etc., and achieve the effect of good optical characteristics

Active Publication Date: 2021-02-19
AAC OPTICS (CHANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The imaging lens disclosed in the related art is an imaging lens composed of the above-mentioned four lenses, but the brightness of Fno ≥ 2.4 is insufficient because the shapes of the second lens and the fourth lens are insufficient.
[0005] An imaging lens disclosed in another related art is an imaging lens composed of the above-mentioned four lenses, but since the shape of the fourth lens is insufficient, the brightness of Fno ≥ 2.4 is insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] figure 2 It is a configuration diagram showing the arrangement of the imaging lens LA of the first embodiment. The object-side and image-side curvature radii R of the first lens L1 to the fourth lens L4 constituting the imaging lens LA of Example 1, the center thickness of the lenses or the axial distance d between lenses, the refractive index nd, and the Abbe number νd is shown in Table 1, and the cone coefficient k and aspheric coefficient are shown in Table 2.

[0165] 【Table 1】

[0166]

[0167]

[0168] 【Table 2】

[0169]

[0170] Table 5 to be described later shows the respective numerical values ​​of Examples 1 and 2 and numerical values ​​corresponding to parameters defined by relational expressions (1) to (9).

Embodiment 2

[0173] Figure 6 It is a configuration diagram showing the arrangement of the imaging lens LA of the second embodiment. The object-side and image-side curvature radii R of the first lens L1 to the fourth lens L4 constituting the imaging lens LA of Example 2, the center thickness of the lenses or the axial distance d between lenses, the refractive index nd, and the Abbe number νd is shown in Table 3, and the cone coefficient k and aspheric coefficient are shown in Table 4.

[0174] 【table 3】

[0175]

[0176]

[0177] 【Table 4】

[0178]

[0179] Example 2, as shown in Table 5, satisfies relational expressions (1) to (6).

[0180] The axial aberration of the imaging lens LA of embodiment 2 is as follows Figure 7 As shown, the chromatic aberration of magnification is as Figure 8 As shown, field curvature and distortion as Figure 9 shown. The imaging lens LA of embodiment 2 is as Figure 7-9 It can be seen that TTL=3.210mm, Fno=2.05, small size and high luminou...

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Abstract

The present invention provides an imaging lens composed of four lenses having good optical characteristics, small size, and high luminous flux F value. The imaging lens is sequentially arranged with a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power, and satisfies the prescribed relational expression .

Description

technical field [0001] The present invention relates to an imaging lens, in particular to a small-sized imaging device, an optical sensor, a module camera for a mobile phone, a WEB camera, etc. that use individual imaging elements such as high-resolution CCDs and CMOSs, and is suitable for use in a camera lens that has various aberrations and is properly corrected. It is an imaging lens composed of 4 lenses with optical characteristics, small size and high luminous flux F-number (hereinafter referred to as Fno). Background technique [0002] In recent years, various imaging devices using imaging elements such as CCDs and CMOSs ​​have spread widely. Along with miniaturization and high performance of these imaging elements, Fno imaging lenses having favorable optical characteristics and small size and high luminous flux are desired. [0003] Technology development related to the imaging lens composed of 4 Fno lenses with excellent optical characteristics, small size and high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
CPCG02B13/004G02B9/34
Inventor 林家正寺冈弘之
Owner AAC OPTICS (CHANGZHOU) CO LTD