CN201145764Y

CN201145764Y - Projector lens

Info

Publication number: CN201145764Y
Application number: CNU2007201965125U
Authority: CN
Inventors: 潘涛; 杨志
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2007-12-26
Filing date: 2007-12-26
Publication date: 2008-11-05
Anticipated expiration: 2017-12-26

Abstract

The utility model is applicable to the optical lens field, which aims to provide a projector lens, wherein, the projector lens, from the object space to the image space, orderly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The lenses all adopt glass materials and are spherical mirrors; the first lens, the second lens and the fourth lens are meniscus lenses which are concave toward the image space; the fifth lens and the sixth lens are bonded to form a lens which is concave toward the image space; and the third lens and the seventh lens are biconvex lenses. Lenses of the projector lens completely adopt spherical design, so various phase differences can be corrected by optimizing spherical coefficients (parameters such as curvature radius of spherical surfaces, spacing between the lenses, lens thickness and so on) to ensure that the projector lens achieves the requirement of imaging quality. In addition, the lenses made of the glass materials are adopted, which can improve brightness and strengthen light transmittance, thereby obtaining good imaging quality and reducing the cost of the projector lens when the requirement of high resolution and small volume is met.

Description

Projector lens

Technical field

The utility model belongs to field of optical lens, relates in particular to a kind of projector lens.

Background technology

Projector generally comprises camera lens and LCD chip.LCD projector color reductibility is better, resolution can reach i.e. 1,300,000 pixels of SXGA (Super Extended Graphics Array) standard.In addition, LCD projector volume is little, and is in light weight, and it is convenient to carry, and is the main product on the projector market.

Projector lens is the significant components in the projector, the quality of camera lens decision imaging performance, thereby lens performance becomes the significant consideration of design projector.Along with the continuous development of science and technology, various portable electron devices also day by day are tending towards light and handy, attractive in appearance and multifunction.Wherein, the miniaturization of camera lens also helps reducing the volume of portable translucent machine.

EP058651B1 and US5,644,435 disclose a kind of zoom lens who is used for small-sized projector respectively, but this class camera lens needs more eyeglass if reach higher resolution, and cost is higher, and volume is also bigger.

The utility model content

The purpose of this utility model is to provide a kind of projector lens, is intended to solve the problem that projector lens resolution is low, volume is big, cost is high that existing portable electron device is used.

The utility model is achieved in that a kind of projector lens, comprises first lens, second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens from the object side to the image side successively.Described lens all adopt glass material and are spherical mirror.Described first, second, the 4th lens are recessed meniscus shaped lens to picture side, the described the 5th and the 6th lens are bonded together and form protruding lens to picture side, the described the 3rd and the 7th lens are biconvex lens.

The utility model compared with prior art, beneficial effect is: because the eyeglass of projector lens adopts the sphere design fully, can the parameters such as radius-of-curvature, the interval between eyeglass and lens thickness by optimizing sphere coefficient such as sphere revise various differing, make projector lens reach the image quality requirement.In addition, adopt the eyeglass of glass material can improve brightness, strengthen transmittance, thereby obtain favorable imaging quality, and when reaching the little requirement of resolution height, volume, can reduce the cost of projector lens.

Description of drawings

Fig. 1 is the structural representation of the utility model projector lens better embodiment.

Fig. 2 is the curvature of field figure of the utility model projector lens better embodiment.

Fig. 3 is the optical distortion figure of the utility model projector lens better embodiment.

Fig. 4 is that the projection parsing of the utility model projector lens better embodiment is tried hard to.

Fig. 5 is the relative exposure figure of the utility model projector lens better embodiment.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Please referring to Fig. 1, a kind of projector lens that the utility model embodiment provides comprises first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, the 6th lens 6 and the 7th lens 7 successively.Described lens 1～7 are spherical mirror, and all adopt glass material.

First lens 1 are recessed meniscus shaped lens to picture side, and it has the first sphere R1 and the second sphere R2, and wherein the first sphere R1 of first lens 1 is the face that light at first contacts.Second lens 2 are recessed meniscus shaped lens to picture side, and it has the 3rd sphere R3 and the 4th sphere R4.The 3rd lens 3 are biconvex lens, and it has the 5th sphere R5 and the 6th sphere R6.The 4th lens 4 are recessed meniscus shaped lens to picture side, and it has the 7th sphere R7 and the 8th sphere R8.The 5th lens 5 and the 6th lens 6 are respectively biconcave lens and biconvex lens, blended rubber is bonded together and forms protruding lens to picture side, wherein, the 5th lens 5 have recessed respectively the 9th sphere R9 and the tenth sphere R10 to object space and picture side, the 6th lens 6 have protruding the 11 sphere R11 to picture side, and the tenth sphere R10 is the cemented surface of the 5th lens 5 and the 6th lens 6.The 7th lens 7 are biconvex lens, and it has the 12 sphere R12 and the 13 sphere R13.

Refractive index n 1 scope of first lens 1 is 1.45＜n1＜1.70, and chromatic dispersion v1 scope is 50＜v1＜60.Preferably, first lens 1 adopt the glass material of S-LAL7 model, and its refractive index is 1.514540, and chromatic dispersion is 54.6284.

Refractive index n 2 scopes of second lens 2 are 1.50＜n2＜1.75, and chromatic dispersion v2 scope is 50＜v2＜65.Preferably, second lens 2 adopt the glass material of BAK7 model, and its refractive index is 1.56889, and chromatic dispersion is 56.11729.

Refractive index n 3 scopes of the 3rd lens 3 are 1.55＜n3＜1.70, and chromatic dispersion v3 scope is 40＜v3＜50.Preferably, the 3rd lens 3 adopt the glass material of BAF5 model, and its refractive index is 1.605620, and chromatic dispersion is 43.9247.

Refractive index n 4 scopes of the 4th lens 4 are 1.60＜n4＜1.70, and chromatic dispersion v4 scope is 55＜v4＜70.Preferably, the 4th lens 4 adopt the glass material of N-SK16 model, and its refractive index is 1.620410, and chromatic dispersion is 60.3236973.

Refractive index n 5 scopes of the 5th lens 5 are 1.75＜n5＜1.85, and chromatic dispersion v5 scope can be 20＜v5＜30.Preferably, the 5th lens 5 adopt the glass material of N-SF6 model, and its refractive index is 1.805180, and chromatic dispersion is 25.35973.

Refractive index n 6 scopes of the 6th lens 6 are 1.55＜n6＜1.65, and chromatic dispersion v6 scope is 55＜v6＜65.Preferably, the 6th lens 6 adopt the glass material of N-SK5 model, and its refractive index is 1.589130, and chromatic dispersion is 61.266813.

Refractive index n 7 scopes of the 7th lens 7 are 1.55＜n7＜1.70, and chromatic dispersion v7 scope is 50＜v7＜60.Preferably, the 7th lens 7 adopt the glass material of BAFL6 model, and its refractive index is 1.5890, and chromatic dispersion is 52.93175.

Tabulation describes the optical parametric of each lens of projector lens of present embodiment below.

Classify one group of optical parametric of first lens, 1 to the 7th lens 7 of present embodiment projector lens in the table 1 as.The full field angle that adopts this group parameter can make the effective focal length f of the projector lens of present embodiment reach f=13.2356 millimeter, whole optical system reaches 30 degree, the optics length overall reaches 85 millimeters.

Table 1

Describe	Radius-of-curvature	Thickness	Clear aperture
Describe	Radius-of-curvature	Thickness	Clear aperture	First sphere	49.70752	1.5	37.5365
Second sphere	22.78655	7.45	32.76933	First sphere	49.70752	1.5	37.5365
Second sphere	22.78655	7.45	32.76933	The 3rd sphere	149.38652	2.35	33.58964
The 4th sphere	26.22365	6.82	31.36569	The 3rd sphere	149.38652	2.35	33.58964
The 4th sphere	26.22365	6.82	31.36569	The 5th sphere	33.12356	9	33.74562
The 6th sphere	-42.75656	10.75236	31.78523	The 5th sphere	33.12356	9	33.74562
The 6th sphere	-42.75656	10.75236	31.78523	The 7th sphere	7.89534	1.55	11.89524
The 8th sphere	6.16350	6.804033	15.25843	The 7th sphere	7.89534	1.55	11.89524
The 8th sphere	6.16350	6.804033	15.25843	The 9th sphere	-23.55626	3.562314	10.24654
The tenth sphere	20.64558	1.26	12.99853	The 9th sphere	-23.55626	3.562314	10.24654
The tenth sphere	20.64558	1.26	12.99853	The 11 sphere	-10.23658	6.98	16.00258
The 12 sphere	46.29568	0.954612	19.00475	The 11 sphere	-10.23658	6.98	16.00258
The 12 sphere	46.29568	0.954612	19.00475	The 13 sphere	-26.44195	3.98	17.95824

See also Fig. 2 to 5, under the optical parametric condition of table 1, the meridianal curvature of field of this projector lens and the sagitta of arc curvature of field are less than 0.5 millimeter, and optical distortion is less than 1%, and its projection is resolved power as shown in Figure 4.

Table 2 is listed to be another group optical parametric of first lens, 1 to the 7th lens 7 of present embodiment projector lens.

Adopt the lens combination of the described optical parametric of table 2, can reach the drop shadow effect of the lens combination of the described parameter of employing table 1 equally.

Table 2

Describe	Radius-of-curvature	Thickness	Clear aperture
Describe	Radius-of-curvature	Thickness	Clear aperture	First sphere	53.70756	1.3	38.63655
Second sphere	20.56952	7.8	32.76933	First sphere	53.70756	1.3	38.63655
Second sphere	20.56952	7.8	32.76933	The 3rd sphere	155.25635	2.62	32.56568
The 4th sphere	24.01562	6.85	30.36558	The 3rd sphere	155.25635	2.62	32.56568
The 4th sphere	24.01562	6.85	30.36558	The 5th sphere	32.17010	9	33.25625
The 6th sphere	-44.26532	11.75	32.48478	The 5th sphere	32.17010	9	33.25625
The 6th sphere	-44.26532	11.75	32.48478	The 7th sphere	8.88585	1.75	12.67229
The 8th sphere	6.17524	6.804033	10.15166	The 7th sphere	8.88585	1.75	12.67229
The 8th sphere	6.17524	6.804033	10.15166	The 9th sphere	-24.65 125	3.562314	10.01523
The tenth sphere	23.54565	1.05	11.80955	The 9th sphere	-24.65 125	3.562314	10.01523
The tenth sphere	23.54565	1.05	11.80955	The 11 sphere	-9.25625	7.25	15.2924
The 12 sphere	45.29382	0.88888	18.11114	The 11 sphere	-9.25625	7.25	15.2924
The 12 sphere	45.29382	0.88888	18.11114	The 13 sphere	-25.65 125	3.75	18.37526

" thickness " in above-mentioned each table is meant this face to the distance of next face, is 1.3 as thickness in " first sphere " row in the table 2, promptly refers to the distance between the first sphere R1 and the second sphere R2, the i.e. thickness of first eyeglass 1 in first eyeglass 1; And thickness is 7.8 in " second sphere " row, refers to the second sphere R2 and arrives the distance of one side (i.e. the 3rd sphere R3 of second eyeglass 2) down, the interval between the eyeglass that just be meant this moment.

The eyeglass of the projector lens of present embodiment adopts sphere design fully, can the parameters such as radius-of-curvature, the interval between eyeglass and lens thickness by optimizing sphere coefficient such as sphere revise various differing, and makes projector lens reach the image quality requirement.For example: the radius-of-curvature of the 6th sphere R6 of the second sphere R2 that can be by adjusting first lens 1, the 4th sphere R4 of second lens 2 and the 3rd lens 3, making distortion that bigger change be arranged, reach the purpose of adjusting distortion; Can pass through the radius-of-curvature of the 11 sphere R11 of adjustment the 6th lens 6, make spherical aberration that bigger change be arranged, reach the purpose of adjusting spherical aberration; The radius-of-curvature of the 8th sphere R8 that can be by adjusting the 4th lens 4 and the 11 sphere R11 of the 6th lens 6 makes the curvature of field that bigger change be arranged, and reaches the purpose of adjusting the curvature of field.

In addition, adopt the eyeglass of glass material can improve brightness, strengthen transmittance, thereby obtain favorable imaging quality, and when reaching the little requirement of resolution height, volume, can reduce the cost of projector lens.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims

1, a kind of projector lens, comprise first lens, second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens from the object side to the image side successively, it is characterized in that, described lens all adopt glass material and are spherical mirror, described first, second, the 4th lens are recessed meniscus shaped lens to picture side, the the described the 5th and the 6th lens are bonded together and form protruding lens to picture side, and the described the 3rd and the 7th lens are biconvex lens.

2, projector lens as claimed in claim 1 is characterized in that, refractive index n 1 scope of described first lens is 1.45＜n1＜1.70, and chromatic dispersion v1 scope is 50＜v1＜60; Refractive index n 2 scopes of described second lens are 1.50＜n2＜1.75, and chromatic dispersion v2 scope is 50＜v2＜65; Refractive index n 3 scopes of described the 3rd lens are 1.55＜n3＜1.70, and chromatic dispersion v3 scope is 40＜v3＜50; Refractive index n 4 scopes of described the 4th lens are 1.60＜n4＜1.70, and chromatic dispersion v4 scope is 55＜v4＜70; Refractive index n 5 scopes of described the 5th lens are 1.75＜n5＜1.85, and chromatic dispersion v5 scope is 20＜v5＜30; Refractive index n 6 scopes of described the 6th lens are 1.55＜n6＜1.65, and chromatic dispersion v6 scope is 55＜v6＜65; Refractive index n 7 scopes of described the 7th lens are 1.55＜n7＜1.70, and chromatic dispersion v7 scope is 50＜v7＜60.

3, projector lens as claimed in claim 1 is characterized in that, described first lens have first sphere and second sphere, and wherein first sphere is the face that light at first contacts; Second lens have the 3rd sphere and the 4th sphere; The 3rd lens have the 5th sphere and the 6th sphere; The 4th lens have the 7th sphere and the 8th sphere; The 5th lens have recessed respectively the 9th sphere and the tenth sphere to object space and picture side; The 6th lens have protruding the 11 sphere to picture side, and wherein the tenth sphere is the cemented surface of the 5th lens and the 6th lens; The 7th lens have the 12 sphere and the 13 sphere.