CN105738983A - Second lens for novel ultra-small optical lens group - Google Patents

Abstract

A second lens for a novel ultra-small optical lens group is characterized in that an object side surface (S3) and an image side surface (S4) of the second lens (4) are aspheric surfaces; and aspheric surface parameters of the object side surface (S3) and the image side surface (S4) of the second lens (4) are represented by the following formula: Z=Cy<2>/(1+(1-(1+K)C<2>y<2>)<1/2>) + A2y<2> + A4y<4> + A6y<6> + A8y<8> + A10y<10> + A12y<12> + A14y<14> + A16y<16>. The second lens for the novel ultra-small optical lens group makes the novel ultra-small optical lens group have the simple structure. Two aspheric lenses are adopted. Each parameter of each lens in the ultra-small optical lens group is scientifically designed, so that the total length of the optical lens group is small. The image formation and aberration are small. The resolution ratio is high. The optical performance is good. The application prospect is good.

Description

A kind of the second lens for novel miniature optical lens group

Technical field

The invention belongs to optical technical field, particularly relate to a kind of the second lens for novel miniature optical lens group.

Background technology

In recent years, along with the constantly progress of science and technology and improving constantly of people's personal consumption level, the integrated level of digital electric equipment is more and more higher, there is the mobile communication phone of camera function, digital camera, the equipment such as camera are all towards miniaturization, ultrathin, portable direction is developed, optical lens is as parts requisite in Vision Builder for Automated Inspection, the overall dimensions of its quality that directly affects image quality and photographic equipment, therefore when design, need to ensure while reducing the overall dimensions of miniature optical camera lens, the resolution of miniature optical camera lens will not decline, need further raising on the contrary, thus meeting the various different demands of user.

Summary of the invention

It is an object of the invention to provide a kind of the second lens for novel miniature optical lens group, while reducing optical lens group contour length, be greatly improved the resolution of optical lens group and simple in construction, it is simple to produce.

The present invention adopts the following technical scheme that

A kind of novel miniature optical lens group, including lens barrel, the first lens, the first spacer ring, the second lens, the second spacer ring and optical filter；Described first lens, the first spacer ring, the second lens, the second spacer ring and optical filter are successively set in lens barrel, and the overall length TTL of optical lens group is 2.5 millimeters.

A kind of the second lens for novel miniature optical lens group, the thing side surface S3 and surface, image side S4 of described second lens 4 are non-spherical surface.

As a further improvement on the present invention, the aspheric surface parameter below equation of the thing side surface S3 and surface, image side S4 of described second lens represents:

$Z=\frac{{\mathrm{Cy}}^2}{1+{(1-(1+K\left)C^2{y}^2\right)}^{1/2}}+A_2{y}^2+A_4{y}^4+A_6{y}^6+A_8{y}^8+A_{10}{y}^{10}+A_{12}{y}^{12}+A_{14}{y}^{14}+A_{16}{y}^{16};$

Wherein Z be along optical axis A direction highly for the position of y using surface vertices as the side-play amount of reference optical axis, C is the inverse of the radius of osculating sphere, namely close to the radius of curvature at optical axis A place, the namely inverse of the radius of curvature of the thing side surface S3 and surface, image side S4 of the second lens, K represents quadratic surface coefficient, and y is aspheric surface height, namely from lens centre toward the height of rims of the lens, also it is the horizontal range from aspheric surface axis of symmetry, A₂、A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆For asphericity coefficient, the aspheric surface parameter of the second lens 4 is as shown in table 2:

The aspheric surface parameter of table 2. second lens

As a further improvement on the present invention, the optics bias of described second lens is 60 degree, and refractive index is 1.585470, and abbe number is 29.909185, lens thickness D2=0.39 ± 0.01 millimeter.

Beneficial effects of the present invention:

The novel miniature optical lens set structure of the present invention is simple, adopt 2 aspherical lens, the scientifically parameters value of each lens in design miniature optical lens group, the total length making optical lens group is little, and imaging and aberration little, resolution is higher, good in optical property, has good application prospect.

Accompanying drawing explanation

Fig. 1 is the assembling structural representation of the miniature optical lens group of the present invention；

Fig. 2 is the cross section structure schematic diagram of first lens of the present invention；

Fig. 3 is the planar structure schematic diagram of first lens of the present invention；

Fig. 4 is the cross section structure schematic diagram of second lens of the present invention；

Fig. 5 is the planar structure schematic diagram of second lens of the present invention；

Fig. 6 is the cross section structure schematic diagram of the optical filter of the present invention；

Fig. 7 is the sectional structure schematic diagram of the lens barrel of the present invention；

Fig. 8 is the planar structure schematic diagram of the lens barrel of the present invention.

In figure: 1-lens barrel, 2-the first lens, 3-the first spacer ring, 4-the second lens, 5-the second spacer ring, 6-optical filter, A-optical axis, the thing side surface of S1-the first lens, the surface, image side of S2-the first lens, the thing side surface of S3-the second lens, the surface, image side of S4-the second lens.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

As shown in figures 1-8, a kind of novel miniature optical lens group, including lens barrel the 1, first lens the 2, first spacer ring the 3, second lens the 4, second spacer ring 5 and optical filter 6；Described first lens the 2, first spacer ring the 3, second lens the 4, second spacer ring 5 and optical filter 6 are successively set in lens barrel 1, and the overall length TTL of optical lens group is 2.5 millimeters.

The thing side surface S1 and surface, image side S2 of described first lens 2 are non-spherical surface；The thing side surface S3 and surface, image side S4 of described second lens 4 are non-spherical surface.

The aspheric surface parameter below equation of the thing side surface S1 and surface, image side S2 of described first lens 2 represents:

$Z=\frac{{\mathrm{Cy}}^2}{1+{(1-(1+K\left)C^2{y}^2\right)}^{1/2}}+A_2{y}^2+A_4{y}^4+A_6{y}^6+A_8{y}^8+A_{10}{y}^{10}+A_{12}{y}^{12}+A_{14}{y}^{14}+A_{16}{y}^{16};$

Wherein Z be along optical axis A direction highly for the position of y using surface vertices as the side-play amount of reference optical axis, C is the inverse of the radius of osculating sphere, namely close to the radius of curvature at optical axis A place, the namely inverse of the radius of curvature of the thing side surface S1 and surface, image side S2 of the first lens 2, K represents quadratic surface coefficient, and y is aspheric surface height, namely from lens centre toward the height of rims of the lens, also it is the horizontal range from aspheric surface axis of symmetry, A₂、A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆For asphericity coefficient, the aspheric surface parameter of the first lens 2 is as shown in table 1:

The aspheric surface parameter of table 1. first lens

Aspheric surface parameter	S1 face	S2 face
			Radius of curvature millimeter	0.3090307	-1.8277525
Effective diameter millimeter	R1=3.235924	R2=-0.547127
			K	0	-0.876312
A2	0	0
			A4	-0.384096	-0.848043
A6	-3.336414	16.987139
			A8	0	-223.106435
A10	0	1754.223773
			A12	0	0
A14	0	0
			A16	0	-0.876312

。

The aspheric surface parameter below equation of the thing side surface S3 and surface, image side S4 of described second lens 4 represents:

$Z=\frac{{\mathrm{Cy}}^2}{1+{(1-(1+K\left)C^2{y}^2\right)}^{1/2}}+A_2{y}^2+A_4{y}^4+A_6{y}^6+A_8{y}^8+A_{10}{y}^{10}+A_{12}{y}^{12}+A_{14}{y}^{14}+A_{16}{y}^{16};$

Wherein Z be along optical axis A direction highly for the position of y using surface vertices as the side-play amount of reference optical axis, C is the inverse of the radius of osculating sphere, namely close to the radius of curvature at optical axis A place, the namely inverse of the radius of curvature of the thing side surface S3 and surface, image side S4 of the second lens 4, K represents quadratic surface coefficient, and y is aspheric surface height, namely from lens centre toward the height of rims of the lens, also it is the horizontal range from aspheric surface axis of symmetry, A₂、A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆For asphericity coefficient, the aspheric surface parameter of the second lens 4 is as shown in table 2:

The aspheric surface parameter of table 2. second lens

Aspheric surface parameter	S3 face	S4 face
			Radius of curvature millimeter	-3.3489842	-1.9784154
Effective diameter millimeter	R3=-0.298598	R4=-0.505455
			K	-0.905339	-6.33506
A2	0	0
			A4	2.233259	-0.158438
A6	-25.228114	9.558585
			A8	393.426137	-56.073191
A10	-2754.642687	220.804007
			A12	0	0
A14	0	0
			A16	0	0

。

The optics bias of described first lens 2 is 60 degree, and refractive index is 1.491756, and abbe number is 57.44091, lens thickness D1=0.53 ± 0.01 millimeter.

The optics bias of described second lens 4 is 60 degree, and refractive index is 1.585470, and abbe number is 29.909185, lens thickness D2=0.39 ± 0.01 millimeter.

Embodiment described above is only that the preferred embodiment of the present invention is described; not the spirit and scope of the present invention are defined; without departing under design concept premise of the present invention; various modification that in this area, technical scheme is made by ordinary skill technical staff and improvement; all should falling into protection scope of the present invention, the technology contents that the present invention is claimed all is recorded in detail in the claims.

Claims (2)

1., for second lens of novel miniature optical lens group, it is characterized in that the thing side surface (S3) of described second lens (4) and surface, image side (S4) are non-spherical surface；The thing side surface (S3) of described second lens (4) and the aspheric surface parameter below equation on surface, image side (S4) represent:

$Z=\frac{{\mathrm{Cy}}^2}{1+{(1-(1+K\left)C^2{y}^2\right)}^{1/2}}+A_2{y}^2+A_4{y}^4+A_6{y}^6+A_8{y}^8+A_{10}{y}^{10}+A_{12}{y}^{12}+A_{14}{y}^{14}+A_{16}{y}^{16};$

Wherein Z be along optical axis (A) direction highly for the position of y using surface vertices as the side-play amount of reference optical axis, C is the inverse of the radius of osculating sphere, namely close to the radius of curvature at optical axis (A) place, the namely inverse of the radius of curvature on the thing side surface (S3) of the second lens (4) and surface, image side (S4), K represents quadratic surface coefficient, y is aspheric surface height, namely from lens centre toward the height of rims of the lens, also it is the horizontal range from aspheric surface axis of symmetry, A₂、A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆For asphericity coefficient, the aspheric surface parameter of the second lens (4) is as shown in table 2:

The aspheric surface parameter of table 2. second lens

Aspheric surface parameter S3 face S4 face Radius of curvature (millimeter) -3.3489842 -1.9784154 Effective diameter (millimeter) R3=-0.298598 R4=-0.505455 K -0.905339 -6.33506 A₂ 0 0 A₄ 2.233259 -0.158438 A₆ -25.228114 9.558585 A₈ 393.426137 -56.073191 A₁₀ -2754.642687 220.804007 A₁₂ 0 0 A₁₄ 0 0 A₁₆ 0 0

。

2. the second lens for novel miniature optical lens group according to claim 1, it is characterized in that: the optics bias of described second lens (4) is 60 degree, refractive index is 1.585470, and abbe number is 29.909185, lens thickness D2=0.39 ± 0.01 millimeter.