CN105044884A

CN105044884A - Miniature projection lens

Info

Publication number: CN105044884A
Application number: CN201510571516.6A
Authority: CN
Inventors: 张敬飞; 陆巍; 罗香石; 贺银波
Original assignee: Shenzhen Dianjingchuangshi Technology Co Ltd
Current assignee: Shenzhen Dianjingchuangshi Technology Co Ltd
Priority date: 2015-09-10
Filing date: 2015-09-10
Publication date: 2015-11-11
Anticipated expiration: 2035-09-10
Also published as: CN105044884B

Abstract

A miniature projection lens comprises a first lens group with positive focal power, a diaphragm, a second lens group with positive focal power, a light splitting device, a piece of protective glass, and an imaging surface. The first lens group is disposed in front of the diaphragm, belongs to an amplification side, and includes a first lens which is a crescent lens with negative focal power, a second lens which is biconvex lens with positive focal power, and a third lens which is a crescent lens with positive focal power. The second lens group is disposed behind the diaphragm, belongs to a reduction side, and includes a fourth lens which is a crescent lens with negative focal power, a fifth lens which is biconcave lens with negative focal power, a sixth lens which is a biconvex lens with positive focal power, and a seventh lens which is a biconvex lens with positive focal power. The miniature projection lens of the invention has a series of advantages of small size, compact structure, low cost, and high imaging quality, and the like.

Description

A kind of Miniature projection lens

Technical field:

The present invention relates to a kind of projection display technique, particularly relate to and a kind ofly have that size is little, compact conformation, cost are low and the Miniature projection lens that image quality is high.

Background technology:

Projection lens is the core component of projector equipment: light, after the light changing device of reflective or penetration, needs imaging in projection lens projects to projection screen.

Along with projector equipment role in life gets more and more, be applied to field and also can get more and more.More equipment needs to embed micro-projection device, and this is also more and more higher to the requirement of projection lens, and size is less, and structure is compacter, and imaging effect is better, and cost is lower.

Compared with the prior art, the present invention has that size is little, compact conformation, cost are low and the series of advantages such as image quality is high.

Accompanying drawing illustrates:

The optical structure chart of Fig. 1 Miniature projection lens

Chip face, each visual field transport function mtf value of Fig. 2 Miniature projection lens

The curvature of field of Fig. 3 Miniature projection lens is schemed with distortion

The chromatic longitudiinal aberration figure of Fig. 4 Miniature projection lens

Embodiment:

Fig. 1 is the optical structure chart of Miniature projection lens of the present invention.As shown in Figure 1; a kind of Miniature projection lens, comprises the imaging surface of the first lens group with positive light coke, the second lens group with positive light coke, the diaphragm between the first lens group and the second lens group, the light-splitting device after the second lens group and cover glass and camera lens.

First lens group comprises tactic first eyeglass P1, the second eyeglass G2 and the 3rd eyeglass G3.Tactic 4th eyeglass G4, the 5th eyeglass G5, the 6th eyeglass G6, the 7th eyeglass P7 is comprised with the second lens group.

Miniature projection lens one of the present invention has 14 optical surfaces.Optical surface S1, S2 and S13, S14 are non-spherical surface, and optical surface S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 are spherical face.First eyeglass P1 is for having negative power selenodont lens, wherein convex surface is towards amplification end, second eyeglass G2 is for having positive light coke lenticular lens, 3rd eyeglass G3 is for having positive light coke selenodont lens, 4th eyeglass G4 is for having negative power selenodont lens, 5th eyeglass G5 is for having negative power double concave type lens, and the 6th eyeglass G6 is for having positive light coke lenticular lens, and the 7th eyeglass P7 is for having positive light coke lenticular lens.

Miniature projection lens of the present invention, feature is as follows: the effective focal length f1 of the first eyeglass P1 should meet-15.8<f1<-12.0, the effective focal length f2 of the second eyeglass G2 should meet 26.0<f2<34.0, the effective focal length f3 of the 3rd eyeglass G3 should meet 24.5<f3<26.5, the effective focal length f4 of the 4th eyeglass G4 should meet-33.5<f4<-35.5, the effective focal length f5 of the 5th eyeglass G5 should meet-15.8<f5<-14.3, the effective focal length f6 of the 6th eyeglass G6 should meet 51.0<f6<55.0, the effective focal length f7 of the 7th eyeglass P7 should meet 15.0<f7<16.5.The focal distance f 8 of the first lens group should meet 9.7<f8<12.3, and the focal distance f 9 of the second lens group should meet 17.0<f9<21.5.

Miniature projection lens of the present invention, it is plastic material that the first eyeglass P1 and the 7th eyeglass P7 makes material, and the second eyeglass G2, the 3rd eyeglass G3, the 4th eyeglass G4, the 5th eyeglass G5, the 6th eyeglass G6 all make with glass material.

In a specific embodiment, lens parameter is as follows:

Aspheric mirror first eyeglass P1 just can draw by aspherical formula the curve that sphere is corresponding with the 7th eyeglass P7, and formula is as follows:

Z = {Q U O T E \frac{{cr}^{2}}{1 + \sqrt{1 - (1 + k) c^{2} r^{2}}} + a_{4} r_{4} + a_{6} r_{6} + a_{8} r_{8} + a_{10} r_{10}}}

Wherein: Z represents the distance of point from aspheric surface summit at optical axis direction in aspheric surface; R represents the distance of the point in aspheric surface to optical axis; C represents aspheric curvature of centre; K represents rate of taper; A4, a6, a8, a10 represent aspheric surface high-order term coefficient.

Non-spherical lens P1 and P7 each rank coefficient is as follows:

According to the micro lens camera lens that design parameter and the imaging system of each lens above-mentioned draw, draw lens optical system Fig. 1.

Fig. 2 is chip face, each visual field transport function mtf value of Miniature projection lens, and horizontal ordinate is spatial frequency coordinate, and ordinate is transport function mtf value.As shown in Figure 2, full filed optical transfer function MTF>53% under 93lp/mm spatial frequency;

Fig. 3 is the curvature of field and the distortion figure of Miniature projection lens, and the curvature of field is in-0.05 ~ 0.05 scope as shown in the figure, and aberration control is within 2%;

Fig. 4 is the chromatic longitudiinal aberration figure of Miniature projection lens, and transverse axis represents aberration size, and the longitudinal axis represents visual field.The vertical aberration of this imaging system is 2.8 microns to the maximum as shown in the figure.

Can learn in sum, Miniature projection lens of the present invention adopts telecentric optical system design, embodies that this Lens is little, compact conformation, cost are low and high imaging quality.

The foregoing is only better embodiment of the present invention; but; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims

1. a Miniature projection lens, comprise the imaging surface of the first lens group with positive light coke, the second lens group with positive light coke, the diaphragm between the first lens group and the second lens group, the light-splitting device after the second lens group and cover glass and camera lens, it is characterized in that: described first lens group is positioned at before diaphragm, comprise the first eyeglass P1, the second eyeglass G2 and the 3rd eyeglass G3; Described second lens group is positioned at after diaphragm, comprises the 4th eyeglass G4, the 5th eyeglass G5, the 6th eyeglass G6, the 7th eyeglass P7.

2. Miniature projection lens as claimed in claim 1, it is characterized in that: in described first lens group, the first eyeglass P1 has negative power selenodont lens for adopting made by plastic material, wherein convex surface is towards amplification end, described second eyeglass G2 has positive light coke lenticular lens for adopting made by glass material, the 3rd eyeglass G3 has positive light coke selenodont lens for adopting made by glass material, and wherein convex surface is towards amplification end.

3. Miniature projection lens as claimed in claim 1, it is characterized in that: in described second lens group, the 4th eyeglass G4 has negative power selenodont lens for adopting made by glass material, wherein convex surface is towards amplification end, described 5th eyeglass G5 has negative power double concave type lens for adopting made by glass material, 6th eyeglass G6 has positive light coke lenticular lens for adopting made by glass material, and the 7th eyeglass P7 has positive light coke lenticular lens for adopting made by plastic material.

4. Miniature projection lens as claimed in claim 2, it is characterized in that: in described first lens group, two surperficial S1, S2 of the first eyeglass P1 are non-spherical surface, two surperficial S3, S4 of the second eyeglass G2 and two surperficial S5, S6 of the 3rd eyeglass G3 are spherical face.

5. Miniature projection lens as claimed in claim 3, it is characterized in that: in described second lens group, two surperficial S11, S12 of two surperficial S8, S9 of the 4th eyeglass G4 and two surperficial S10, S11 of the 5th eyeglass G5 and the 6th eyeglass G6 are spherical face, two surperficial S13, S14 of the 7th eyeglass P7 are non-spherical surface.

6. Miniature projection lens as claimed in claim 2, it is characterized in that: the effective focal length f1 of described first eyeglass P1 should meet-1.82<f1/F<-1.39, the effective focal length f2 of the second eyeglass G2 should meet 3.0<f2/F<3.93, and the effective focal length f3 of the 3rd eyeglass G3 should meet 2.83<f3/F<3.06.

7. Miniature projection lens as claimed in claim 3, it is characterized in that: the effective focal length f4 of described 4th eyeglass G4 should meet-4.11<f4/F<-3.88, the effective focal length f5 of the 5th eyeglass G5 should meet-1.82<f5/F<-1.66, the effective focal length f6 of the 6th eyeglass G6 should meet 5.9<f6/F<6.36, and the effective focal length f7 of the 7th eyeglass P7 should meet 1.73<f7/F<1.91; Miniature projection lens as claimed in claim 1, it is characterized in that: the focal distance f 8 of described first lens group should meet 1.1<f8/F<1.42, and the focal distance f 9 of the second lens group should meet 1.96<f9/F<2.49.