CN100543511C - The DLP long back work distance zooming projection lens - Google Patents

Abstract

The present invention relates to a kind of DLP long back work distance zooming projection lens, its principal feature is: the optical system in the camera lens is made up of the zoom group U2 of focusing group U1 with negative power and positive light coke and the compensation group U3 of positive light coke, U1, U2, U3 along optical axis from screen side to the picture planar side series arrangement, wherein, focusing is to realize by moving forward and backward of U1 group, zoom is to relatively move along optical axis to the end of dolly-out,ing dolly-back from wide-angle side by U2 and U3 to realize, in the zoom process, remain unchanged to the total distance of image planes from first on camera lens, this system has characteristics such as reaching satisfied image quality on the image planes than the long back work distance, lens in the camera lens all adopt spherical lens, good manufacturability adapts to and produces in batches.

Description

The DLP long back work distance zooming projection lens

Technical field

The invention belongs to the optical instrument technical field, be on a kind of DLP of being adapted at projector with the matching used long back work distance zooming projection lens of non-telecentric light light path.

Background technology

The DLP projection display technique develops rapidly in recent years, and its development trend shows that for the image of realizing giant-screen, high definition, high brightness on short projector distance it can realize that more volume is little, and is in light weight waits product performance.What the core component in the DLP technology mainly adopted is DMD digital picture chip; DMD is the exclusive digital picture chip of grasping and developing of TIX, because its time that emerges is shorter relatively, therefore the patented technology of the DLP projection imaging optical system that is complementary with the DMD technology is few, and existing LCD, what projection lens such as LCOS adopted is telecentric system, can not satisfy the supporting requirement of DMD digital picture chip fully, this mainly is because the miniature reflective mirror on the DMD has the upset of 10 or 12 degree with image digital signal when work, to enter the entrance pupil of projection lens and focus on the screen from the upset reflection by micro-reflector of the light beam of lighting source, based on these characteristics, LCD, projection lens such as LCOS often can not fully satisfy the supporting requirement of DMD digital picture chip.

In addition, in existing disclosed Zooming-projection camera lens technology, a part has been used the aspheric surface technology, promptly in the optical system of Zooming-projection camera lens, improve the image quality or the simplied system structure of system by the adding non-spherical lens, but the application of non-spherical lens is to its processing and matching requirements strictness, be unfavorable for the raising of production efficiency and the reduction of cost, and in the technology that does not adopt non-spherical lens, in order to reach optical property preferably, its technical measures generally are the quantity that increases lens, generally more than 12, or adopt the high-grade optical material of the high index of refraction of external import, the material of FCD1 that aberration is significantly improved and so on for example, it costs an arm and a leg, manufacturability is poor, working (machining) efficiency and yield rate are very low.In the disclosed a kind of Zooming-projection camera lens of Jap.P. 02120574 technology, the material that is adopted just comprises high-grade materials such as FCD1, LAF, and lens numbers is all more than 12, thereby has problems such as cost height, work efficiency be low too.In addition, optical system have long back work distance from the time its aberration correction become also very difficult, and the DLP optical projection system also needs long back work distance sometimes from the lighting requirement that satisfies system.

Summary of the invention

The purpose of this invention is to provide and a kind ofly can be complementary, and compact conformation, be implemented in than the long back work distance and reach satisfied image quality, be fit to the DLP long back work distance zooming projection lens of batch production requirements with DMD digital picture chip.

For reaching such purpose, technical scheme provided by the present invention is: the optical system of this Zooming-projection camera lens is made up of the zoom group U2 of focusing group U1 with negative power and positive light coke and the compensation group U3 of positive light coke, U1, U2, U3 along optical axis from screen side to the picture planar side series arrangement, wherein, U2 and U3 from wide-angle side to the end of dolly-out,ing dolly-back along the optical axis realization zoom that relatively moves, in the zoom process, remain unchanged to the total distance of image planes from first on camera lens, promptly this Zooming-projection camera lens is a two sets mobile variable-focus, the combined focal length of focusing group is f1, the focal distance f 2 of compensation group, both opposite in signs, and need satisfy following inequality:

0.85<|f1/f2|<1.15

Wherein:

Focusing group U1 is made up of positive lens L1, negative lens L2, negative lens L3 to the image planes direction from screen side, and its combined focal length is for negative.

Zoom group U2 is made up of negative lens L4, positive lens L5, negative lens L6 to the image planes direction from screen side, wherein negative lens L4, positive lens L5 are cemented doublet, negative lens L4, positive lens L5 in the cemented doublet are the flint glass lens, and the total focal length of zoom group is for just.

Compensation group U3 from screen side to the image planes direction by positive lens L7, positive lens L8, negative lens L9, positive lens L10, negative lens L11 and positive lens L12 form, wherein, negative lens L9, positive lens L10, negative lens L11 forms one three balsaming lens, negative lens L9 in three balsaming lenss, negative lens L11 is the flint glass lens, positive lens L10 is the crown glass lens of low chromatic dispersion, aberration that on the one hand can more effective correction system, utilize the error of optical grade to reduce mechanical rigging error on the other hand, make that the assembling of system is simple and easy, tolerance is tolerant more, and the total focal length of this compensation group U3 is for just.

Each lens is spherical lens in the system, and lens add up to 12.

For fully improving the image planes homogeneity, the distance of exit pupil of DLP projection lens will be controlled in the scope that the reflected light angle with the DMD micro-reflector is complementary, in addition, simple and feasible for structure, it is little that the bore of the tail end of DLP projection lens will be tried one's best, to guarantee having enough spaces to make illumination path can obtain effective and reasonable layout.Certainly, the rear portion bore of projection lens can not be too little, and too little bore can not guarantee the F number of total system on the one hand, also may have influence on the illuminance uniformity of imaging surface.

The invention has the advantages that:

1, the non-spherical lens of adopting process complexity not in the system, thereby improved the simplification of the processing and the assembling of lens and zoom lens, improved finished product rate and production efficiency, more adapt to and produce in batches.

2, when guaranteeing that long back work is apart from image quality, constitute total system with the spherical lens of lesser amt, and adopt conventional optical material, reduce cost of products.

3, pass through the consistance of the interior image quality of the whole focal range of mobile assurance of two lens combination, and can keep the aberration correction of high levels, saved back fixed lens group in the structure again, so structure is more compact.

4, the present invention is provided with the short distance of exit pupil that is complementary with DMD digital picture chip and guarantees system, being significantly improved of its luminous energy output and contrast.

5, the present invention has characteristics such as compact conformation, focusing is convenient, projection image is clear.

Description of drawings

Fig. 1 is the structural representation of zoom lens of the present invention;

Fig. 2 is the short burnt optical system diagram of zoom lens of the present invention;

Fig. 3 is a varifocal mirror head length Jiao's of the present invention optical system diagram;

Fig. 4 is that zoom lens of the present invention is at short burnt ray trajectory figure;

Fig. 5 is that zoom lens of the present invention is at long burnt ray trajectory figure;

Fig. 6 is that zoom lens of the present invention is at the short burnt curvature of field and distortion curve figure;

Fig. 7 is that zoom lens of the present invention is at the long burnt curvature of field and distortion curve figure;

Fig. 8 is that zoom lens of the present invention is at short burnt transfer curve figure;

Fig. 9 is that zoom lens of the present invention is at long burnt transfer curve figure;

Figure 10 is that zoom lens of the present invention is at short burnt vertical axial aberration curve map;

Figure 11 is that zoom lens of the present invention is at long burnt vertical axial aberration curve map;

Figure 12 is that zoom lens of the present invention is at short burnt point range figure;

Figure 13 is that zoom lens of the present invention is at long burnt point range figure.

Embodiment

Referring to Fig. 1, Fig. 2, Fig. 3, DLP long back work distance zooming projection lens of the present invention, critical piece comprise focusing ring 1, focusing spacing ring 2, focusing drawtube 3, guide cylinder 4, roller guide pin 5, zoom handle 6, zoom lens barrel 7, curve tube 8, roller guide pin 9, compensation lens barrel 10, back lens barrel 11, roller guide pin 12 and optical system lens group.Wherein: focusing drawtube 3 is by being threaded in the front end of guide cylinder 4, its front portion is set with focusing ring 1, rotate focusing ring 1, can drive focusing drawtube 3 rotates thereupon, and move axially with respect to guide cylinder 4, realize the focusing function of focusing group U1, place restrictions on the maximum displacement that it moves by the focusing spacing ring 2 that is installed on the focusing drawtube 3 simultaneously.The outer cover of guide cylinder 4 is equipped with curve tube 8, curve tube 8 is provided with and is used for two curve chutes that zoom lens barrel 7, compensation lens barrel 10 move and one and places restrictions on curve tube 8 axially movable equipotential chutes, and realize the rotation of curve tube 8 by being contained in roller guide pin 5 and being slidingly matched of equipotential chute on the guide cylinder 4, place restrictions on moving axially of curve tube 8 simultaneously, zoom handle 6 is connected on the curve tube 8, is used to handle the rotation of curve tube 8.Zoom lens barrel 7 is sleeved on guide cylinder 4 inside, its all side be equipped with curve tube 8 on the roller guide pin 12 that is slidingly matched of curve chute, when curve tube 8 rotates, roller guide pin 12 can slide along curve chute, and move axially along the limit sliding chutes of offering on the guide cylinder 4, drive zoom lens barrel 7 simultaneously and move, reach the purpose of zoom group U2 zoom.The assembling of compensation group U3 for convenience, the rear end of compensation lens barrel 10 is connected with back lens barrel 11, compensation lens barrel 10 is connected with guide cylinder 4 suits, and by being connected in the roller guide pin 9 of compensation on the lens barrel 10 and the compensate function of curve chute on the curve tube 8 and the realization of the limit sliding chutes on the guide cylinder 4 offset lens group U3.Positive lens L1, negative lens L2 and negative lens L3 are assembled in the focusing drawtube 3 by trim ring and spacer ring, constitute focusing group U1; Negative lens L4, positive lens L5, negative lens L6 are assembled in the zoom lens barrel 7, constitute zoom group U2; Positive lens L7, positive lens L8 are assembled in the compensation lens barrel 10, and 11 negative lens L9, positive lens L10, negative lens L11 and positive lens L12 constitute compensation group U3 in the lens barrel of back together with being assembled in.

Optical system in the DLP Zooming-projection camera lens of the present invention adopts 12 lens arrangements, includes only cemented doublet L4, a L5 and one three balsaming lens L9, L10, L11 in the system.This camera lens adopts conventional mechanical type compensation cam mechanism, can organize moving forward and backward of U1 by focusing for the projected image of different distance focuses, guarantee that along moving forward and backward of optical axis image planes are stable by compensation group U3, total system for negative-just-the eurymeric structure.Fig. 2 is the burnt system diagram of weak point, and Fig. 3 is the burnt system diagram of length, two intervals of moving between group U2 and U3 when dw is weak point Jiao, the interval when dt is length Jiao between U2 and the U3.The present invention is two groups of zoom system, pancreatic systems that relatively move, light beam is no longer directly forming real image through conventional back fixed lens group on chip behind over-compensation group U3, therefore, the focal length of compensation group U3 just is necessary for, be the zoom unit for just-the eurymeric structure, like this can be so that structure is further compact.

Zoom lens focusing group U1 comprises 3 lens, i.e. 1 positive lens L1 and 2 negative lens L2, L3, zoom group comprises 3 lens, i.e. 1 positive lens L5 and 2 negative lens L4, L6, the compensation group comprises 6 lens, i.e. 4 positive lens L7, L8, L10, L12 and 2 negative lens L9, L11, like this, can guarantee that by the collocation of the correspondence of positive negative lens the aberration that moves forward and backward lens combination can correct fully alone, also just may constitute one and only constitute and reach the zoom system, pancreatic system of satisfied image quality, and the picture element that this structure more helps in the zoom process is stable in long back work distance by two groups of mobile lens.In order not allow the aperture of lens of rear end too big, system Guang Lan is arranged on the rear portion of camera lens, otherwise, to satisfy under the little prerequisite of rear portion aperture of lens, it is very difficult that the rectification of aberration becomes.Certainly, can also make that the track of light beam is more level and smooth by suitably strengthening the bore of front lens.

The focusing group U1 that light is had a disperse function is imaged on remote thing near the position 2 times of focal lengths of object space of zoom group U2, make zoom group U2 be in magnification, help like this for realizing that certain zoom ratio is unlikely to the long length overall that increases system of displacement of lens combination near-1 the position.

In order to make Zooming-projection camera lens clear in different projector distance imagings, the focal power that is distributed in focusing group U1 is wanted rationally should satisfy as lower inequality:

0.85<|f1/f2|<1.15

Wherein, f1 is the combined focal length of focusing group U1, and f2 is the combined focal length of compensation group, exceeds this scope, the just difficult control of the aberration of other position.

The structural parameters of Zooming-projection camera lens of the present invention are as follows

SO 0.0?2000.0

S 70.327?6.15?QK3_CHINA

S -368.1?0.2

S 76.0130899252?3.5?BAK4_CHINA

CCY?0

S 23.77?5.49303868373

THC?0

S -374.583?1.5?FEL6_HOYA

S 29.986?12.9535210365

THC?0

S -528.6?1.5?FD8_HOYA

S 21.78?7.8?NBFD15_HOYA

S -58.5?6.02

S -37.0302747048?1.5?BAK4_CHINA

CCY?0

S 247.492?16.7450887846

THC?0

S 218.8?3.06?LAK12_CHINA

S -88.3?0.2

S 28.777?4.0?BAF10_HOYA

S 268.32?8.48

S 0.0?5.1

STO

S 82.04?1.4?FD8_HOYA

S 26.623?6.34?QK3_CHINA

S -26.623?1.4?NBFD12_HOYA

S -45.7?1.13

S 108.459221752?3.0?FDS90_HOYA

CCY?0

S -73.79?32.0083514952

THC?0

S 0.0?3.0?FK5_SCHOTT

S 0.0?0.52

SI 0.0?0.0

ZOO 3

ZOO THI?S6?12.9535210365?18.9991047587?21.4436014431

ZOO?THC?S6?000

ZOO THI?S22?32.0083514952?34.5216037?37.126838843

ZOO?THC?S22?000

ZOO THI?S11?16.7450887846?8.18625285752?3.1365210302

ZOO?THC?S11?000

Following table is the chromatic longitudiinal aberration of system when the length focal length

Field is the visual field coordinate of complete relatively visual field in the table, and R is the ratio chromatism, of long wave and reference light, unit: micron, B is the ratio chromatism, of shortwave and reference light, unit: micron.

Referring to Fig. 4, Fig. 5, be that zoom lens of the present invention is at short burnt, long burnt ray trajectory figure; Fig. 4 is short burnt ray trajectory figure, and Fig. 5 is long burnt ray trajectory figure.

Referring to Fig. 6, Fig. 7, be the curvature of field and the distortion curve figure of zoom lens of the present invention short Jiao, long Jiao, Fig. 6 is the short burnt curvature of field and distortion curve figure, Fig. 7 is the burnt curvature of field and distortion curve figure of length.

Referring to Fig. 8, Fig. 9, be that zoom lens of the present invention is burnt at weak point, the burnt transfer curve figure at 46lp/mm of length, Fig. 8 is short Jiao's transfer curve figure, Fig. 9 is long Jiao's transfer curve figure.

Referring to Figure 10, Figure 11, be the vertical axial aberration curve map of zoom lens of the present invention short Jiao, long Jiao, Figure 10 is short burnt vertical axial aberration curve map, Figure 11 is the burnt vertical axial aberration curve map of length.

Referring to Figure 12, Figure 13, be the point range figure of zoom lens of the present invention short Jiao, long Jiao, Figure 12 is short burnt point range figure, Figure 13 is the burnt point range figure of length.

Claims (4)

1, a kind of DLP long back work distance zooming projection lens, optical system in the camera lens is made up of the zoom group U2 of focusing group U1 with negative power and positive light coke and the compensation group U3 of positive light coke, each is organized along optical axis from screen side to the series arrangement of picture planar side, wherein, zoom group U2 and compensation group U3 from wide-angle side to the end of dolly-out,ing dolly-back along the optical axis realization zoom that relatively moves, in the zoom process, remain unchanged to the total distance of image planes from first on camera lens, this Zooming-projection camera lens is a two sets mobile variable-focus, the combined focal length of focusing group U1 is f1, the focal length of compensation group U3 is f2, both opposite in signs, and satisfy following inequality: 0.85＜| f1/f2|＜1.15, it is characterized in that: focusing group U1 from screen side to the image planes direction by positive lens L1, negative lens L2, negative lens L3 forms, its combined focal length is for negative, zoom group U2 from screen side to the image planes direction by negative lens L4, positive lens L5, negative lens L6 forms, negative lens L4 wherein, positive lens L5 is a cemented doublet, the total focal length of zoom group U2 is for just, compensation group U3 from screen side to the image planes direction by positive lens L7, positive lens L8, negative lens L9, positive lens L10, negative lens L11 and positive lens L12 form, wherein, negative lens L9, positive lens L10 and negative lens L11 are three balsaming lenss, and total focal length of compensation group U3 is for just.

2, DLP long back work distance zooming projection lens according to claim 1 is characterized in that: negative lens L4, positive lens L5 in the described cemented doublet are the flint glass lens.

3, DLP long back work distance zooming projection lens according to claim 1 is characterized in that: negative lens L9, negative lens L11 in described three balsaming lenss are the flint glass lens, and positive lens L10 is the crown glass lens of low chromatic dispersion.

4, DLP long back work distance zooming projection lens according to claim 1 is characterized in that: each lens is spherical lens among described focusing group U1, zoom group U2 and the compensation group U3, and the sum of its lens is 12.

Images