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A camera lens and lens technology, applied in the field of camera lens, can solve the problems of insufficient correction and insufficient focal length ratio, and achieve the effect of good optical characteristics
Pending Publication Date: 2021-07-13
CHANGZHOU RAYTECH OPTRONICS CO LTD
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[0004] Due to the ratio of the focal lengths of the second lens to the third lens, the ratio of the focal lengths of the second lens to the fourth lens, and the object The ratio of the axial distance from the side surface to the image side surface of the second lens to the focal length of the entire imaging lens is insufficient, so the correction of distortion (Distortion) becomes insufficient, and |TV_D|>1.0%
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no. 1 approach
[0040] reference together Figure 1 to Figure 4 , the present invention provides the imaging lens 10 of the first embodiment, in figure 1 Among them, the left side is the object side, the right side is the image side, the camera lens 10 has a lens system with a seven-piece structure, and the lens system with a seven-piece structure is sequentially arranged from the object side to the image side. The second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7. A glass flat plate GF is arranged between the seventh lens L7 and the image plane Si. As the glass flat plate GF, a cover glass plate, various filters, and the like can be assumed. In the present invention, the glass flat plate GF may be arranged at different positions or may be omitted.
[0041] In this embodiment, the first lens L1 is a lens with negative refractive power, the second lens L2 is a lens with positive refractive power, the third lens L3 is a lens w...
no. 2 approach
[0161] Figure 4 It is a configuration diagram showing the arrangement of the imaging lens 20 of the second embodiment. The second embodiment is basically the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.
[0162] Table 5 and Table 6 show design data of the imaging lens 20 according to the second embodiment of the present invention.
[0163] Table 5 shows the central curvature R, lens axial thickness or inter-lens axial distance d, and refraction of each object side surface and image side surface of the first lens L1 to the seventh lens L7 constituting the imaging lens 20 of the second embodiment. nd, Abbe's number νd, the conic coefficient k and aspheric coefficient of lens surfaces S1 to S13 are shown in Table 6, the conical coefficient k and free-form surface coefficient of lens surface S14 are shown in Table 7, and 2ω is shown in Table 8. , Fno, f, f1, f2, f3, f4, f5...
no. 3 approach
[0182] Figure 7 It is a configuration diagram showing the arrangement of the imaging lens 30 of the third embodiment. The third embodiment is basically the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.
[0183] Tables 9 and 10 show design data of the imaging lens 30 according to the third embodiment of the present invention.
[0184] Table 9 shows the central curvature R, lens axial thickness or inter-lens axial distance d, and refraction of each of the object side and image side surfaces of the first lens L1 to the seventh lens L7 constituting the imaging lens 30 of the third embodiment. Conic coefficient k and aspheric surface coefficient of lens surfaces S1 to S13 are shown in Table 10, conical coefficient k and free-form surface coefficient of lens surface S14 are shown in Table 11, and 2ω is shown in Table 12. , Fno, f, f1, f2, f3, f4, f5, f6, f7, TTL, TV_D.
[01...
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Abstract
The invention relates to the field of optical lenses, and discloses a camera lens. The camera lens is sequentially composed of a first lens with negative refractive power, a second lens with positive refractive power, a third lens, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a sixth lens and a seventh lens with negative refractive power from an object side to an image side, wherein the image side surface of the seventh lens is a free-form surface; wherein the focal length of the camera lens is f, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the axial distance from the object side surface of the first lens to the image side surface of the second lens is D12, the axial distance from the object side surface of the second lens to the image side surface of the third lens is D23, and the following relational expressions are met: the absolute value of f2 / f3 is less than or equal to 0.07; -0.50 <= f2 / f4 <=-0.30; 0.58 <= D12 / f <= 0.64; and 0.35 <= D23 / f <= 0.45. The present invention can provide an imaging lens having a TV_D absolute value of less than 1.0%, having good optical characteristics, having 2[omega] higher than 110 degrees and a wide angle, and comprising seven lenses.
Description
technical field [0001] The present invention is an invention related to an imaging lens. In particular, an invention relates to an imaging lens that is suitable for use in smartphone camera modules, WEB cameras, etc. using imaging elements such as CCD and CMOS for high pixels, and has a full angle of view (hereinafter referred to as 2ω) of 110° or more In addition, the wide-angle imaging lens consists of seven lenses with |TV distortion (hereinafter referred to as |TV_D|) within 1.0%, good optical characteristics. Background technique [0002] In recent years, among various imaging devices using imaging elements such as CCD and CMOS, a wide-angle imaging lens with a small TV_D and good optical characteristics has been sought. [0003] The technical development of such a camera lens is being advanced: |TV_D|<1.0%, has good optical characteristics, has a wide angle, and is composed of seven lenses. As an imaging lens with the seven-piece structure, Patent Document 1 propo...
Claims
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Application Information
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