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Image pickup lens

A camera lens and lens technology, applied in the field of camera lenses, can solve the problems of insufficient power distribution of the first lens and the second lens, insufficient brightness, insufficient miniaturization, etc.

Inactive Publication Date: 2012-07-04
AAC TECH JAPAN R D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The imaging lens disclosed in Patent Document 2 is the above-mentioned imaging lens composed of four pieces, which is widened to a full viewing angle (2ω)>70°, but, due to The focal power distribution of the first lens and the second lens of the entire imaging lens is insufficient, so in the disclosed embodiment, the degree of miniaturization is insufficient, and the brightness such as Fno=2.69 is insufficient.

Method used

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Examples

Experimental program
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Embodiment 1）

[0254] figure 2 It is a configuration diagram showing the arrangement of the imaging lens LA of the first embodiment. Table 1 shows the radii of curvature R, lens center thickness, or inter-lens distance d, refractive index nd, and Abbe's of each of the object side and image plane side of the first lens L1 to the fourth lens L4 constituting the imaging lens LA of Example 1. The number νd, Table 2 shows the conical coefficient k and aspheric coefficient.

[0255] 【Table 1】

[0256]

[0257] 【Table 2】

[0258]

[0259] In Example 1, as shown in Table 35, conditional expressions (1) to (9) are satisfied.

[0260] The spherical aberration (axial chromatic aberration) of the imaging lens LA of Example 1 is image 3 As shown in , the chromatic aberration of magnification is at Figure 4 As shown in , astigmatism and distortion aberration in Figure 5 shown in . From the above results, it can be seen that the imaging lens LA of Example 1 has the characteristics o...

Embodiment 2）

[0262] Figure 6It is a configuration diagram showing the arrangement of the imaging lens LA of the second embodiment. Table 3 shows the curvature radii R, lens center thickness or inter-lens distance d, refractive index nd, and Abbe's of each of the object side and image plane side of the first lens L1 to the fourth lens L4 constituting the imaging lens LA of Example 2. The number νd, Table 4 shows the conical coefficient k and aspheric coefficient.

[0263] 【table 3】

[0264]

[0265] 【Table 4】

[0266]

[0267] In Example 2, as shown in Table 35, conditional expressions (1) to (9) are satisfied.

[0268] The spherical aberration (axial chromatic aberration) of the imaging lens LA of Example 2 is Figure 7 As shown in , the chromatic aberration of magnification is at Figure 8 As shown in , astigmatism and distortion aberration in Figure 9 shown in . From the above results, it can be seen that the imaging lens LA of Example 2 has the characteristics of wide-an...

Embodiment 3）

[0270] Figure 10 It is a configuration diagram showing the arrangement of the imaging lens LA of the third embodiment. Table 5 shows the curvature radii R, lens center thickness, or inter-lens distance d, refractive index nd, and Abbe's radii of each of the first lens L1 to the fourth lens L4 constituting the imaging lens LA of Example 3 on the object side and the image surface side. The number νd, Table 6 shows the conical coefficient k and aspheric coefficient.

[0271] 【table 5】

[0272]

[0273] 【Table 6】

[0274]

[0275] In Example 3, as shown in Table 35, conditional expressions (1) to (9) are satisfied.

[0276] The spherical aberration (axial chromatic aberration) of the imaging lens LA of Example 3 is Figure 11 As shown in , the chromatic aberration of magnification is at Figure 12 As shown in , astigmatism and distortion aberration in Figure 13 shown in . From the above results, it can be seen that the imaging lens LA of Example 3 has the char...

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Abstract

An image pickup lens includes, in sequence from an object side to an image side, an aperture stop; a first lens having two convex surfaces and having a positive refractive power; a second lens in a meniscus shape whose convex surface faces to the object side having a negative refractive power; a third lens in a meniscus shape with the convex surface facing to the image side having a positive refractive power; a fourth lens in a meniscus shape with the convex surface facing to the object side having a negative refractive power. Furthermore the following conditions are satisfied: 0.7<=f1 / f<=1.05, -1.8<=f2 / f<=-1.2, -0.7<=R1 / R2<=-0.17, 4.0<=R3 / R4<=70.0, 0.1<=d4 / f<=0.2, wherein, f, f1, f2, f3, f4 respectively represent an overall focus distance and the focus distances of the first lens, the second lens, the third lens and the fourth lens; R1, R2, R3 and R4 respectively represent the curvature radius of the object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, and the image side surface of the second lens; and d4 represents an axis distance between the image side surface of the second lens and the object side surface of the third lens.

Description

technical field [0001] The present invention relates to imaging lenses. In particular, it relates to an imaging lens that is suitable for small imaging devices using single imaging elements such as CCDs and CMOSs ​​for high pixels, optical sensors, module cameras for mobile phones, WEB cameras, etc. The difference is properly corrected for good optical characteristics. The imaging lens has the advantages of wide angle and miniaturization and is composed of bright four-piece lenses with Fno<2.6, wherein the Fno represents the brightness of the imaging optical system. [0002] Background technique [0003] In recent years, various imaging devices using solid-state imaging elements such as CCDs and CMOSs ​​have been widely used. Along with miniaturization and higher performance of these imaging elements, miniaturization and favorable optical characteristics are also required for imaging lenses used in imaging devices. [0004] In response to the demand for miniaturization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/22G02B13/18G02B1/04G02B1/00
CPCG02B9/34G02B13/004
Inventor 寺冈弘之
Owner AAC TECH JAPAN R D CENT
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