CN100543510C - Projection optical system and use the image projection device of this system - Google Patents
Projection optical system and use the image projection device of this system Download PDFInfo
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- CN100543510C CN100543510C CNB2006101075509A CN200610107550A CN100543510C CN 100543510 C CN100543510 C CN 100543510C CN B2006101075509 A CNB2006101075509 A CN B2006101075509A CN 200610107550 A CN200610107550 A CN 200610107550A CN 100543510 C CN100543510 C CN 100543510C
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Abstract
The invention provides the long varifocal optical system of a kind of Wide-angle, back focal length, this system possesses from front to back in order: be in the 5th lens unit of the 3rd lens unit, the 4th lens unit, the negative power of the 2nd lens unit, the negative power of the 1st lens unit, the positive light coke of the negative power of motionless state for zoom, be in the 6th lens unit of the positive light coke of motionless state for zoom.When the focal length of the 1st lens unit L1 is designated as focal length that f1, air conversion back focal length be designated as the total system of bf, wide-angle side and is designated as fw, meet the following conditions: 1.7＜bf/ (| f1|fw)
1/2＜2.3.By satisfying this condition, in the miniaturization of seeking lens combination integral body, revise each aberration that zoom produces well, and have the good optical performance on the whole at picture.
Description
The present invention is that the name of submitting on August 11st, 2004 is called the dividing an application of No. 200410056597.8 patented claim of " varifocal optical system, projection optical system and use the image projection device of this system ".
Technical field
The present invention relates to varifocal optical system or projection optical system, such as, projection optical system be applicable to the image projection device of original image enlarging projection to the screen (projecting plane).
Background technology
In the past, proposed image-displaying members such as various use liquid crystal display cells, the image (original image) that shows on this display element had been projected liquid crystal projection apparatus (image projection apparatus) on the screen cover (projection surface).
Particularly liquid crystal projection apparatus is as the device of image projection on big picture of microcomputer etc. being widely used in the occasion in the meeting and the demonstration Room.Recently, can see that the theatrical use small-sized liquid crystal projection apparatus of family is universal, meanwhile also have the tendency of liquid crystal display cells compact in size.
About such liquid crystal projection apparatus, its kind roughly is divided into two kinds, a kind of is the porjection type liquid crystal projection apparatus that the modulation image that has seen through liquid crystal display cells is carried out look synthetic back projection, another kind is in the liquid crystal display cells back side one side catoptron to be set, the reflective liquid crystal projection apparatus that modulation image is carried out projection after by this mirror reflects.
In the 3 board-like liquid crystal projection apparatus that use 3 liquid crystal display cells, a kind of space must be set between liquid crystal display cells and projecting lens, elements such as colour splitting prism that configuration is synthesized the coloured light by liquid crystal display cells modulation in this space and polarization plate must be guaranteed the back focal length of certain certain-length on the projecting lens.
The negative leading type zoom lens that the lens unit of negative power is taken the lead in such liquid crystal projection apparatus, have been extensive use of.Negative leading type zoom lens have than being easier to wide-angleization, and can keep the characteristics such as optical property of close-shot shadow distance well, and still, the amount of movement that moves lens unit on the other hand during zoom increases, and aberration changes also along with increase.Also exist and be difficult to high zoom ratiosization, and then be difficult to realize suppressing the shortcomings such as wide-angleization of each aberration.
In addition, must accomplish as the projection optics system that in the color liquid crystal projector, uses:
This optical system is in order to make the synthetic film of the look that is provided with in colour splitting prism minimum to angle dependency influence, in order to ensure with the good pupil matching of illuminator, the pupil of liquid crystal display cells (dwindling) side is positioned at the so-called telecentric optical system of infinity
The figure of the liquid crystal display cells of 3 looks (image) is synthetic when projecting on the screen, must on the whole zone of picture, overlap each color pixel, make the literal of personal computer can not see slur, perhaps can not damage exploring sense and quality.Therefore, revise the colour cast (multiplying power chromatic aberation) that in projecting lens, takes place well in the visible light district.
Revising the distorted image official post fully must can not produce the outline portion distortion to the image of institute's projection and be difficult to watch (if the variation of the rapid distortion aberration of particularly remaining periphery and center section etc., then image quality is low, is unfavorable).
In addition, requiring the high brightness of picture, high definition of image recently, small-sized, lightweight maneuverability, device are paid attention in strong request in the projector that carries small panel on the other hand.And then also require indoorly can obtain the high brightness of the projection of bright and big picture, the standard of wide-angle narrow and small.
In the past, the projecting lens of using as liquid crystal projection apparatus, as everyone knows, from the Zoom Side (front side) sequentially by negative, positive, positive and negative, just, the lens unit of positive light coke constitutes, overall 6 lens units (annotating: be translated into lens unit) constitute, and are to make wherein predetermined lens unit suitably move 6 set vari-focus lens that carry out zoom.(for example, the spy opens the 2001-108900 communique) this 6 set vari-focus lens is owing to fix the 1st, the 4th and the 6th lens unit, from wide-angle side when the telescope end zoom, the the 2nd, the 3rd and the 5th group of mobile lens inside, therefore the lens total length keeps certain during zoom, is the heart zoom lens far away of the aberration change when suppressing chromatic aberation, zoom.But the length of back focal length was not enough when this 6 set vari-focus lens was used for reflective liquid crystal projection apparatus.
In addition, as the projecting lens that liquid crystal projection apparatus is used, well-known, (front side) sequentially is made of lens unit negative, positive, negative, positive focal power from the Zoom Side, overall 4 lens units constitute, and are to make wherein predetermined lens unit suitably move 4 set vari-focus lens that carry out zoom.(for example, the spy opens the 2001-215410 communique) this 4 set vari-focus lens is owing to fix the 1st and the 4th lens unit, from wide-angle side when the telescope end zoom, make the 2nd, the 3rd group of lens combination inside to move, therefore the lens total length keeps certain, and be considered reflection-type liquid crystal projection apparatus the back focal length with abundant length and than the heart zoom lens far away of the image angle of broad.But this 4 set vari-focus lens opening F value (later F value representation opening) is bigger, can not reach enough brightness.
In addition, as the projecting lens that the projector that has used the transmission-type liquid crystal display element is used, known spy open flat 11-190821 communique (correspondence: US6285509) and the spy open 2000-01900 communique (correspondence: US6081398).
Now, wish it is small-sized, mobile model as liquid crystal projection apparatus.Use as home theater in addition and require to carry out the closely projection of great advantage, promptly require the wide-angleization of liquid crystal projection apparatus.In addition, in recent years, turn to purpose, use the liquid crystal display cells of the good reflection-type of aperture efficiency more with the high brightness of projected image.
Problem for the liquid crystal projection apparatus miniaturization, at first must make liquid crystal display cells little, but if seek common ground during sample exploring rate, the aperture opening ratio of liquid crystal display cells reduces, and the size of illuminated zone and illuminating source reduces than (size of the size/light source in=illuminated field), and therefore, illumination efficiency generally reduces, produce the miniaturization that promptly allows to implement device, but the problem that brightness reduces.
Under the situation of transmission-type liquid crystal display element, along with the liquid crystal display cells size decreases, according to driving circuit, its aperture opening ratio reduces, and light reduces.Different therewith, under the situation of reflection type liquid crystal display element, can driving circuit be set, so the aperture opening ratio height can suppress light and reduce in back side of panel one side.Therefore, be target with effective high brightness recently, the zoom lens that the liquid crystal projection apparatus of the reflection-type that the expectation aperture efficiency is high is used.But, in the liquid crystal projection apparatus of reflection-type, add colour splitting prism isochrome combining optical between projecting lens and liquid crystal display cells, insert polarisation split-optics etc., therefore compare with the transmission-type liquid crystal projector, need have the projecting lens of long back focal length.
On the basis of the problems referred to above, in order to ensure the screen illumination that also can observe under the fluorescent lamp, the F value (F number) that the projecting lens of using for small projector is contemplated to be wide-angle side is 3.0 or the projecting lens of its above lightness.
In addition, because zoom or focusing cause that the pupil location change of original image one side is unfavorable.Need the constant aperture diaphragm for liquid crystal display cells, perhaps the change of pupil is suppressed for very little with the mobile of a plurality of lens units.
That is, expect it is high brightness, high-resolution as the reflective liquid crystal projection apparatus of small-sized light weight, the pupil location change is few, and has sufficiently long back focal length, closely projection lens projecting.
Summary of the invention
The purpose of this invention is to provide a kind of varifocal optical system or projection optical system, this system is in the miniaturization of seeking lens combination integral body, and back focal length is long, for example is applicable to the projecting lens of liquid crystal projection apparatus.
Varifocal optical system as a scheme of the present invention, it is characterized in that from the place ahead (screen side under the projection arrangement situation, under the camera situation by the photograph side) (original image side under the situation of projection arrangement, the imaging side under the camera situation) sequentially possesses to the rear: for zoom the 5th lens unit of the 3rd lens unit of the 2nd lens unit of the 1st lens unit of motionless negative power, positive light coke, negative power, the 4th lens unit, negative power, for zoom the 6th lens unit of motionless positive light coke.When the focal length of the 1st lens unit L1 being designated as focal length that f1, air conversion back focal length be designated as the total system of bf, wide-angle side and being designated as fw, meet the following conditions:
1.7<bf/(|f1|·fw)
1/2<2.3。
In addition, projection optics system as another program of the present invention, a plurality of lens units that the space changes when having zoom, with the original image enlarging projection to the projecting plane, it is characterized in that air conversion back focal length (the air scaled distance between the short reduced side conjugate position (original image position) of conjugate length and the nearest lens element of reduced side conjugate position) justifies 2.5 times of (image circle) diameter or more than it, when it effectively is designated as diameter of a circle for the effective picture on original picture position
When the distance of the short focal length extremity of the position from above-mentioned original image to the paraxial pupil of watching in above-mentioned original image one side is designated as tk, meet the following conditions:
Description of drawings
Fig. 1 has been to use the skeleton diagram at main position of image projection device of the varifocal optical system of numerical value embodiment 1.
Fig. 2 A and Fig. 2 B are the aberration diagrams of the varifocal optical system of numerical value embodiment 1.
Fig. 3 has been to use the skeleton diagram at main position of image projection device of the varifocal optical system of numerical value embodiment 2.
Fig. 4 A and Fig. 4 B are the aberration diagrams of the varifocal optical system of numerical value embodiment 2.
Fig. 5 has been to use the skeleton diagram at main position of image projection device of the varifocal optical system of numerical value embodiment 3.
Fig. 6 A and Fig. 6 B are the aberration diagrams of the varifocal optical system of numerical value embodiment 3.
Fig. 7 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 4.
Fig. 8 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 5.
Fig. 9 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 6.
Figure 10 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 7.
Figure 11 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 8.
Figure 12 has been to use the skeleton diagram at main position of image projection device of the use projection optical system of numerical value embodiment 9.
Figure 13 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 10.
Figure 14 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 11.
Figure 15 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 12.
Figure 16 has been to use the skeleton diagram at main position of image projection device of the projection optical system of numerical value embodiment 13.
Figure 17 A and Figure 17 B are the aberration diagrams of the projection optical system of numerical value embodiment 4.
Figure 18 A and Figure 18 B are the aberration diagrams of the projection optical system of numerical value embodiment 5.
Figure 19 A and Figure 19 B are the aberration diagrams of the projection optical system of numerical value embodiment 6.
Figure 20 A and Figure 20 B are the aberration diagrams of the projection optical system of numerical value embodiment 7.
Figure 21 A and Figure 21 B are the aberration diagrams of the projection optical system of numerical value embodiment 8.
Figure 22 A and Figure 22 B are the aberration diagrams of the projection optical system of numerical value embodiment 9.
Figure 23 A and Figure 23 B are the aberration diagrams of the projection optical system of numerical value embodiment 10.
Figure 24 A and Figure 24 B are the aberration diagrams of the projection optical system of numerical value embodiment 11.
Figure 25 A and Figure 25 B are the aberration diagrams of the projection optical system of numerical value embodiment 12.
Figure 26 A and Figure 26 B are the aberration diagrams of the projection optical system of numerical value embodiment 13.
Figure 27 is the skeleton diagram at the main position of image projection device when being applied to reflective liquid crystal projection apparatus.
Concrete embodiment
The 1st example
Below, the example to varifocal optical system of the present invention (zoom lens) describes with reference to the accompanying drawings.
Fig. 1 is the main position skeleton diagram of the image projection device (liquid crystal video projector) of the use zoom lens of the embodiment of the invention 1.Fig. 2 A, 2B be the object distance (distance from 1st lens unit to screen) of the numerical value of corresponding embodiments of the invention 1, numerical value embodiment 1 described later when representing with the mm of unit during for 1.8m wide-angle side (short focal length extremity) and the aberration diagram of telescope end (long focal length extremity).
Fig. 3 is the main position skeleton diagram of the image projection device (the brilliant video projector of ripple) of the use zoom lens of the embodiment of the invention 2.Fig. 4 A, 4B be the object distance (distance from 1st lens unit to screen) of the numerical value of corresponding embodiments of the invention 2, numerical value embodiment 2 described later when representing with the mm of unit during for 1.8m wide-angle side (short focal length extremity) and the aberration diagram of telescope end (long focal length extremity).
Fig. 5 is the main position skeleton diagram of the image projecting apparatus (liquid crystal video projector) of the use zoom lens of the embodiment of the invention 3.Fig. 6 A, 6B be the object distance (distance from 1st lens unit to screen) of the numerical value of corresponding embodiments of the invention 3, numerical value embodiment 1 described later when representing with the mm of unit during for 1.8m wide-angle side (short focal length extremity) and the aberration diagram of telescope end (long focal length extremity).
Be illustrated in original image (image that is projected) that liquid crystal display LCD etc. shows above in the image projection device of the embodiment 1～3 of Fig. 1, Fig. 3, Fig. 5 with zoom lens (projecting lens, projecting lens) state during enlarging projection on screen cover S.
S is that screen cover (projecting plane), LCD are the original images of liquid crystal display (liquid crystal display cells) etc.Screen cover S and original image LCD are conjugate relation, and general screen cover S is the conjugate points (first conjugate points) in a side of distance, is equivalent to Zoom Side (the place ahead); Original image LCD is in the conjugate points (second conjugate points) of the short side of distance, is equivalent to reduced side (rear).
GB is equivalent to look synthetic prisms, polarizing filter and colored filter etc., is that the glass blocks that is provided with is gone up in design.
Zoom lens PL is by on the main body that connects material (not shown) and be contained in the liquid crystal video frequency projector (not shown).The liquid crystal display cells LCD of glass blocks GB back is included in the main body of projector.
L1 is the 1st lens unit of negative power (inverse of focal power=focal length), L2 is the 2nd lens unit of positive light coke, L3 is the 3rd lens unit of negative power, L4 is the 4th lens unit of negative or positive focal power, L5 is the 5th lens unit of negative power, and L6 is the 6th lens unit of positive light coke.The 4th lens unit L4 is a negative power in embodiment 1 and 3, is positive light coke in embodiment 2.ST is an aperture diaphragm, is arranged in the 2nd lens unit.
Among each embodiment, when the telescope end zoom, as shown by arrows, the 2nd lens unit L2, the 3rd lens unit L3 are towards screen side S from wide-angle side, and the 4th lens unit L4, the 5th lens unit L5 move towards original image side LCD is independent respectively.Because zoom, so the 1st lens unit L1, the 6th lens unit L6 do not move.But, the 1st lens unit L1 is moved on optical axis, focus on.Focus on and also can be undertaken by moving display screen LCD.
Each lens face has applied laminated coating, reduces with this illumination that can prevent screen cover S.
In the aberration diagram of Fig. 2 A, 2B, Fig. 4 A, 4B, Fig. 6 A, 6B, G represents the aberration under the wavelength 550nm, R represents the aberration under the wavelength 620nm, and B represents the aberration under the wavelength 450nm, and each represents the aberration under the wavelength 550nm S (inverted image of sagitta of arc portrait), M (inverted image of meridian image).Y is an image height, and Fno is the F number.
Below the feature of each embodiment is described.
In each embodiment, feature is: 6 lens units are arranged as a whole, 4 lens units are moved.
In each embodiment, guarantee the wide-angle of picture and the back focal length of length easily by the negative leading type structure that the lens unit that adopts negative power is gone ahead of the rest.In addition, the removable lens unit that is used for zoom is made the aberration change that 4 compositions can be revised zoom, in full zooming range, obtain optical property widely.
In addition, for zoom, the simultaneously relative image planes of the 1st, the 6th lens unit are fixed, and make the focal length total length constant.It is hereby ensured the fastness of projection part, it is little by the lens unit (the 1st lens unit) that fixedly effective diameter is big weight balancing to be changed when zoom in addition, plays favourable effect aspect mechanism.
When the focal length of the 1st lens unit being designated as focal length that f1, air conversion back focal length be designated as the total system of bf, wide-angle side and being designated as fw, satisfy following (1) formula:
1.7<bf/(|f1|·fw)
1/2<2.3-------(1)
Conditional (1) is the condition that realizes wide-angleization and obtain the back focal length of sufficient length simultaneously.If surpass the upper limit, then the focal power of the 1st lens unit L1 can be strong excessively, particularly is difficult to carry out the aberration correction of off-axis ray.On the contrary, if surpass lower limit, then because the focal power (inverse of focal length) of the 1st lens unit L1 dies down, so the diameter of lens is the tendency of increase, and then the total length of lens can be elongated, and mechanical realization is undesirable.
When the focal length of the 1st lens unit and the 2nd lens unit is designated as f1 and f2 respectively, satisfy formula (2):
0.5<|f1|/f2<0.9---------(2)
Conditional (2) has suitably been set the 2nd lens unit L2 of main transformer focus lens unit and the relation of the 1st lens unit L1.If surpass the upper limit, then the aberration during zoom changes greatly, is difficult to revise, if above lower limit, then the amount of movement of the 2nd lens unit L2 during zoom can become greatly, is difficult to miniaturization.
When the focal length of the total system of wide-angle side is designated as fW, when the focal length of above-mentioned the 4th lens unit is designated as f4, satisfy formula (3):
10<|f4|/fw<40---------(3)
Conditional (3) is that regulation is modified to the condition of image position with the multiplying power of correction lens unit (compensating prism) L4 of the change of zoom.If surpass lower limit, then the focal power of the L4 of the 4th lens unit is strong excessively, back focal length be lengthened to needed more than, be difficult to miniaturization, be unfavorable.On the contrary, if surpass the upper limit, then the focal power of the L4 of the 4th lens unit excessively a little less than, amount of movement increases in the zoom, is unfavorable.
In addition, the 6th lens unit L6 is made of a slice or the above positive lens of a slice, when minimum Abbe number is designated as υ 6p in the Abbe number of the material that constitutes this a slice or the above positive lens of a slice, satisfies following (4) formula:
υ6p<30--------(4)
Conditional (4) is the condition when high dispersivity material is used for positive lens.Two lens faces of high dispersivity and high focal power can keep the disposition far away of relative image planes by the positive lens that uses convex surface, can play the effect that is suppressed at the high order multiplying power chromatic aberation that takes place among the 5th lens unit L5 simultaneously.If surpass the upper limit, then be difficult to fully revise the multiplying power chromatic aberation that is low chromatic dispersion state, and then be low dispersion owing to be accompanied by the general glass that uses, have the tendency of low power, so be difficult to obtain enough dispositions far away.
In addition, in order to seek aberration correction and the whole miniaturization of device, the numerical range of above-mentioned conditional (1)～(4) can be set as follows:
1.9<bf/(|f1|·fw)
1/2<2.2--(1a)
0.55<|f1|/f2<0.8---------------(2a)
11<|f4|/fw<38--------------------(3a)
υ6p<28------------------------------------(4a)
Among each embodiment, the 1st lens unit L1 sequentially is made of towards the positive lens of the falcate at rear towards the negative lens of the falcate in the place ahead, two negative lenses, convex surfaces positive lens, the convex surface of two lens face convexs from front to back.Like this, the 1st lens unit L1 forefront is provided with positive lens, mainly revises the distortion aberration at the wide-angle side zoom position well.
In addition, in order to suppress very for a short time, in off-axis ray height positive lens little, rear side, use big (Abbe number the is little) material of chromatic dispersion to high order multiplying power chromatic aberation.In addition, 3 negative lenses that are provided with between 2 positive lenss of the 1st lens unit L1 constitute with above-mentioned shape, the feasible focal power that has in each lens face of cutting apart 3 negative lenses, and distortion aberration, astigmatism, the intelligent type aberration that negative lens produces becomes minimum.
The 2nd lens unit L2, by positive lens, negative lens, aperture diaphragm, two lens faces is that the positive lens of convex constitutes (embodiment 1,3), or is that positive lens, negative lens, aperture diaphragm, two lens faces of convex are that the positive lens of convex constitutes (embodiment 2) by two lens faces.
The 3rd lens unit L3 is that the negative lens of matrix and bonding lens of positive lens that two lens faces are convex constitute by two lens faces.
The effect that the 2nd lens unit L2 and the 3rd lens unit L3 mainly take on Zoom lens unit provides big focal power.Therefore in positive lens, use the high glass material of refractive index, ペ ッ Star バ-Le and and aberrations such as the spherical aberration change during zoom reduce.If require heavy caliber, high exploring power, then the image planes degree of depth at rear is shallow; And if curvature of the image such as intermediary image height and astigmatism are big, then exploring sense meeting rapid deterioration.Therefore, the 2nd lens unit L2 constitutes as previously mentioned, with this with ペ ッ Star バ-Le and be modified to very little.
Particularly, when color is not magnificent, in the visible light broadband,, in positive lens, use the materials such as heavy flint of the lanthanum family that anomalous dispersion is arranged to revise effectively in order to revise the multiplying power chromatic aberation well.
In addition, aperture diaphragm is present in the 2nd lens unit L2, during zoom and the 2nd lens unit L2 move the off-axis aberration change in the time of can suppressing zoom simultaneously.
The 4th lens unit L4 is that the negative lens of matrix and positive lens that two lens faces are convex constitute by two lens faces.
Focal plane moved when the 4th lens unit L4 undertook the correction zoom.For zoom universe (variable focal length universe), the multiplying power of the 4th lens unit L4 wait doubly or etc. doubly more than,, rearward move when the telescope end zoom from wide-angle side.
The 5th lens unit L5 is that positive lens, the convex surface of convex constitutes towards the negative lens of the falcate at rear by negative lens, two lens faces sequentially from front to back, these each lens can be independently, also can comprise the joint lens of 2 or 2 above lens bonding.
The height of incidence of the preceding square shaft glazed thread of the 5th lens unit L5 that when aperture diaphragm ST watches, is disposed at reduced side for minimum position on, the lens that have strong negative power by configuration, can be very effectively ペ ッ Star バ-Le with suppress for very little.Also have,, revise the multiplying power chromatic aberation easily, can make each lens have smaller curvature simultaneously, be easy to become the susceptibility of problem in the passivation manufacturing by utilizing 2 or 3 bonding lens.
In each embodiment, the 5th lens unit L5 is made of 3 bonding lens, provides strong negative power the positive lens of convex surface on 2 little lens of curvature that two lens faces are clipped in the middle.According to this strong negative power, can reduce effectively ペ ッ Star バ-Le and.In addition, by adopting cemented lens to play the effect that suppresses the multiplying power chromatic aberation.And, owing to can therefore help guaranteeing disposition far away and back focal length the principal plane position configuration in liquid crystal display cells LCD side for pupil.
The 6th lens unit L6 is that the positive lens of convex constitutes by two lens faces.This positive lens is gently tortuous so that have good disposition far away for the light of seeing the lens unit of the negative power that is disposed at reduced side from aperture diaphragm ST and jumping out, and preferably use the material that has high index of refraction as glass material, if do like this, then reduce easily ペ ッ Star バ-Le and.In addition, the 6th lens unit L6 has used the positive lens of high focal power and high chromatic dispersion, can play the effect of the high order multiplying power chromatic aberation that takes place in the negative lens that suppresses the 5th lens unit L5 when keeping disposition far away for image planes.
For the whole optical system miniaturization, it is necessary increasing each power of lens.The increase of the various aberrations that bring for the focal power increase of revising at this moment is preferably in projecting lens PL inside and adopts 1 non-spherical lens at least.Specifically, in the embodiment 3 of Fig. 5, lens face the 1st lens unit L1, begin the place ahead one side of several the 4th negative lenses from the place ahead is made aspheric surface.
Aspheric surface preferably is made of casting mold glass or replica grating, still, according to the target of exploring degree and the susceptibility of non-spherical lens, also can use the non-spherical lens of plastics.Though also depend on the aberration that will remove, in order well to revise off-axis aberration such as curvature of the image, astigmatism, employing is effective from the position of the aperture diaphragm ST of the 1st and the 5th and the 6th lens unit to position far away as far as possible.
Aperture diaphragm ST can be set to the original independent aperture group that moves, if considering simultaneously to produce to go up adds cam path etc., can be configured in the Zoom lens unit in the 2nd or the 3rd lens unit, so just can revise the aberration change when focusing on very effectively.
As discussed above, if according to each embodiment, can realize that then heavy caliber, reduced side have good disposition far away, high exploring, low distortion, have the zoom lens of back focal length type of the back focal length of the length of revising the multiplying power aberration well in the visible light broadband.And then, in the short projection distance of 1.8m, can obtain 60 inches large screen projection image.
Below, the numerical value embodiment 1～3 of the numeric data of the zoom lens of corresponding embodiment 1～3 respectively is shown.I represents the order of the optical surface of (the place ahead) beginning from the Zoom Side among each numerical value embodiment, ri is the radius-of-curvature of i optical surface (i face), di is the interval of i face and (i+1) face, and ni and υ i are respectively the material refractive indexes for I optical material of d line, the expression Abbe number.F is a focal length, and Fno is the F number.In addition, 3 faces of the reduced side of numerical value embodiment 1～3 are to constitute the face that is equivalent to suitable glass blocks GB such as look synthetic prisms or face flat board, various optical filters.
In addition, when k as the constant of the cone, A, B, C, D are benchmark as asphericity coefficient with the vertex of surface, when the displacement of the optical axis direction in the height h position of optical axis is designated as x, aspherical shape can with [several 1] expression.
[several 1]
Wherein r is paraxial radius-of-curvature.In addition, as [e-Z] expression be " 10
-z".
Above-mentioned each conditional (1)～(4) are shown in table 1 with the relation of each numerical value of numerical value embodiment 1～3.
Numerical value embodiment 1
i ri di ni vi
1 113.900 3.811 1.72000 50.2
2 -2324.594 0.150
3 51.859 1.600 1.69680 55.5
4 23.124 6.166
5 2309.678 1.600 1.69680 55.5
6 35.836 6.493
7 -36.287 1.600 1.69680 55.5
8 107.216 7.128
9 -95.912 4.560 1.83400 37.2
10-34.286 (variable D10)
11 43.509 5.088 1.63980 34.5
12 -1026.440 22.982
13 24.184 1.700 1.65160 58.6
14 15.689 20.56824
15 (apertures) 4.33424
16 75.917 4.468 1.51633 64.1
17-27.394 (variable D17)
18 -52.882 1.500 1.83400 37.2
19 29.124 5.708 1.51823 58.9
20-29.134 (variable D20)
21 -28.832 1.600 1.83400 37.2
22 53.636 0.150
23 43.349 5.158 1.80518 25.4
24-43.359 (variable D24)
25 -72.144 1.600 1.80518 25.4
26 24.550 11.452 1.60311 60.6
27 -24.560 1.600 1.80518 25.4
28-41.022 (variable D28)
29 73.690 5.234 1.84666 23.8
30 -73.680 1.000
31 ∞ 60.000 1.74400 44.8
32 ∞ 6.000 1.51633 64.1
33 ∞
Fno＝2.0-2.3
Numerical value embodiment 2
i ri di ni vi
1 123.812 3.811 1.51633 64.1
2 -311.006 0.150
3 52.482 1.700 1.69680 55.5
4 24.197 4.815
5 116.908 1.700 1.69680 55.5
6 32.549 7.522
7 -29.619 1.700 1.69680 55.5
8 117.550 6.366
9 -123.304 4.773 1.83400 37.2
10-35.252 (variable D10)
11 80.895 4.891 1.63980 34.5
12 -90.556 26.694
13 374.281 1.700 1.72000 50.2
14 19.853 1.14497
15 28.366 2.91551 1.61293 37.0
16 96.680 11.971
17 (apertures) 0.300
18 50.441 4.457 1.65844 50.9
19-31.225 (variable D19)
20 -43.587 1.700 1.83400 37.2
21 31.140 4.955 1.51633 64.1
22-31.150 (variable D22)
23 -26.247 2.200 1.83400 37.2
24 58.237 0.150
25 49.007 5.542 1.80518 25.4
26-29.326 (variable D26)
27 -38.974 1.700 1.80518 25.4
28 26.858 11.775 1.60311 60.6
29 -19.557 2.100 1.84666 23.8
30-30.998 (variable D30)
31 72.772 5.087 1.84666 23.8
32 -88.527 1.000
33 ∞ 60.000 1.74400 44.8
34 ∞ 6.000 1.51633 64.1
35 ∞
Fno＝2.0-2.3
Numerical value embodiment 3
i ri di ni vi
1 115.356 3.593 1.72000 50.2
2 -1411.068 0.065
3 50.378 1.582 1.69680 55.5
4 23.001 6.117
5 1208.830 1.790 1.69680 55.5
6 35.770 6.198
7* -36.326 1.626 1.69680 55.5
8 92.829 7.506
9 -106.651 4.537 1.83400 37.2
10-35.136 (variable D10)
11 43.718 5.028 1.63980 34.5
12 -895.592 22.986
13 23.758 1.702 1.65160 58.6
14 15.326 19.386
15 (apertures) 4.52962
16 73.460 4.509 1.51633 64.1
17-26.599 (variable D17)
18 -51.513 1.618 1.83400 37.2
19 29.012 5.719 1.51823 58.9
20-29.072 (variable D20)
21 -29.187 1.605 1.83400 37.2
22 51.207 0.150
23 42.108 5.421 1.80518 25.4
24-42.704 (variable D24)
25 -68.804 1.605 1.80518 25.4
26 24.157 11.464 1.60311 60.6
27 -24.499 1.702 1.80518 25.4
28-41.387 (variable D28)
29 73.388 5.224 1.84666 23.8
30 -72.276 1.000
31 ∞ 60.000 1.74400 44.8
32 ∞ 6.000 1.51633 64.1
33 ∞
Fno＝2.0-2.3
7 ※ ... be the glass mould aspheric surface, aspheric constants is as follows
r＝-2.75286e-02?K＝-2.89785e-02
A＝-1.24937e-07?B＝3.2469e-09?C＝-2.37336e-11?D＝5.25583e-14
Table 1
(the 2nd example)
Below, the projection optical system (projecting lens) of the 2nd embodiment of the present invention is described.
Fig. 7～16 are to use the skeleton diagram of major part of the image projection device (liquid crystal video projector) of the projecting lens of embodiment 4～13.Figure 17～26th, the numerical value embodiment 4～13 described later of corresponding embodiment 4～13, the aberration diagram of wide-angle side (short focal length extremity) and telescope end (long focal length extremity) when numerical value is represented with the mm of unit.Embodiment 4～7 supposition object distance (the 1st lens unit is to the distance of screen) are 2.85m in the aberration diagram, and embodiment 8～13 supposition object distance (the 1st lens unit is to the distance of screen) are 2.1m.
In Fig. 7～16, left is screen side (amplifying conjugation side, the place ahead), and right-hand is original image side (dwindling conjugation side, rear).L1 is that the 1st lens unit, L2 are that the 2nd lens unit, L3 are that the 3rd lens unit, L4 are that the 4th lens unit, L5 are that the 5th lens unit, L6 are the 6th lens units.What P represented is the glass blocks of look separation, look synthetic prisms etc.This glass blocks is recited as in embodiment 4～13 with 2 formations, but also both can be divided into a plurality of glass blocks, also can the airspace be set according to suitable thickness and separate.This glass blocks P is assumed to colour splitting prism, polarisation resolution element, colo(u)r filter etc. and sets in design.
What represent in the aberration diagram is, from a left side, and spherical aberration, curvature of the image, distortion aberration, multiplying power chromatic aberation.Aberration diagram illustrates spherical aberration, astigmatism (curvature of the image), distortion (%) multiplying power chromatic aberation respectively, and epimere is designated as wide-angle side (WIDE), the lower end is designated as telescope end (TELE).Spherical aberration illustrates the situation of 550nm, 470nm and 620nm.Shown in the multiplying power chromatic aberation is under the 550nm benchmark, the value of 470nm, 620nm.Solid line is represented in the astigmatism, and what be that sagitta of arc cross section, dotted line represent is the meridian cross section.
Embodiment 4～8, begin sequentially from amplifying the conjugation side, 4 lens units by the 4th lens unit L4 of the 3rd lens unit L3 of the 2nd lens unit L2 of the 1st lens unit L1 of negative power, positive light coke, negative power, positive light coke constitute, the 4th lens unit L4 fixes during zoom, on the 4th lens unit L4 next door aperture diaphragm is arranged.The 1st, 2,3 lens units can move when zoom among the embodiment 4～8.
In addition, the F number of embodiment 5,6 is 1.6 and the embodiment of heavy caliber projecting lens among the embodiment 4～8, and the F number of other embodiment 4,7,8 is 2.
Embodiment 9～13rd, and during zoom, the 1st lens unit L1 and the most last lens unit (the 5th lens unit L5 or the 6th lens unit L6) are fixed the example of other lenses cell moving.Aperture diaphragm is arranged in each and moves group.Move group though embodiment 9～13 aperture diaphragms are arranged in, constituted and suppressed the structure that pupil location changes.
Embodiment 9～13 is described in detail.
At first, embodiment the 9, the 13rd, from amplifying the conjugation side, sequentially has 6 groups of structures of 6 lens units of negative positive and negative positive positive light coke.
Embodiment 10～12nd, from amplifying the conjugation side, sequentially have 5 groups of structures of 5 lens units of negative positive and negative positive positive light coke.
Embodiment the 9,10, the 13rd, and the deviation angle θ on the original image of the chief ray under the maximum image height y of reduced side conjugate plane (original image) is at minus side, and promptly the pupil location of watching from the original image that aberration occurs is at the example of positive side (comparing reduced side with original image).
Each projecting lens of embodiment 4～13 is for the back focal length that extends, the lens unit (the 1st lens unit) of negative power is set in the most close Zoom Side, the change of pupil location and in order far to set pupil (reduced side is heart effect far away) for original image (reduced side conjugate plane) when suppressing zoom, the lens unit of the positive light coke that when reduced side is provided with zoom, does not move.In addition, make the 1st lens unit L1 move the focusing of carrying out on the screen along optical axis.
The back focal length of embodiment 4～13 projection optical systems (lens at rear (dwindling the conjugation side) and the air scaled distance between original image) is effectively to look like 2.5 times of diameter of garden (image circle, around the garden of original images such as liquid crystal display cells) or more than it, when effectively being designated as diameter of a circle
When the distance from above-mentioned original image position to the short focal length extremity of the position of the paraxial pupil of watching in the original image side is designated as tk, satisfy with following formula (5):
In addition, when the angle that the face normal in the chief ray of the maximum image height in the reduced side conjugate plane position (original image) and reduced side conjugate plane (original image) position is constituted is designated as θ, constitute satisfied
|θ|<0.8° (6)
In addition, when the lens diameter that dwindles most conjugation side (rear) is designated as D, back focal length (lens at rear and the air scaled distance between original image) when being designated as bf, constitutes satisfied
0.6<D/bf<0.92 (7)
According to above-mentioned effective picture diameter of a circle
Relation, preferably D is constituted satisfied
When the focal length that is positioned at the lens unit that dwindles conjugation side (rear) most is designated as fk, preferably satisfy
0.9<bf/fk<2.0 (9)
Particularly be preferably in effective picture diameter of a circle
And following relation arranged between the back focal length fk
Technical meaning to conditional describes below.
Conditional (5) is that the projecting lens for present embodiment is taken into reflection-type display element etc. effectively and shows catoptrical necessary condition on the dignity.If when breaking away from this condition, even how bright projecting lens, that peripheral luminosity is many also is difficult to projection effectively on screen.
This is described in detail.Use under the situation of transmission-type liquid crystal display element, the chief ray (light of beam center) that sees through the light beam of liquid crystal display cells from light source side is set to liquid crystal display cells approximate vertical (heart far away) incident.Therefore, if for this light beam the lens of the heart far away (the pupil distance is very long) roughly as projecting lens, then the loss of projecting lens side almost depends on aperture opening ratio (vignetting factor).That is,,, we can say the loss that does not almost have projecting lens to produce if the efficient beam of projecting lens is roughly the same for illuminating bundle.Illuminating bundle and lens efficient beam are independent respectively.
Different therewith, use under the situation of reflection type liquid crystal display element, if from the chief ray of the illumination light of light source side for the liquid crystal display cells out of plumb, then can not be taken into the reflected light (reflected light does not return in the lens) on liquid crystal display cells surface with projecting lens, the utilization factor of illumination light drops to more than the aperture opening ratio of projecting lens.Promptly, use in the projection optics system of reflection-type display element, become " light beam that the reflected light=projecting lens of liquid crystal display cells is taken into ", if this point is with consistent according to the open angle of the effective diameter of projecting lens, the utilization factor of light is best, and illuminating bundle and lens efficient beam become the relation of subordinate.Briefly, if it is identical with the liquid crystal display cells beam reflected to invest the light beam of liquid crystal display cells, excellent in efficiency.If the light beam of investing liquid crystal display cells is from the normal of the liquid crystal display cells display surface θ that staggers, reflected light 2 θ that stagger relatively.Preferably make θ as far as possible little.This point means with the projector that uses the transmission-type liquid crystal display element to be compared, and the length of the pupil of the projecting lens of the projector of use reflection type liquid crystal display element influences lightness easily.
In addition, the look synthetic of the formation glass blocks P that disposes at the rear of projecting lens (original image side), separation prism, just can not can not fully produce the efficient of the projecting lens that has bright opening through the light quantity of bright wide region if size is little.In addition, particularly use under the situation of reflection type liquid crystal display element, because the light beam that look separates is put in the light path of projecting lens, and then need be synthetic at the same look that carries out, the prism block that therefore, must have picture garden (effectively the looking like the garden) thickness more than 2.5 times or 2.5 times in the reduced side of projecting lens.
Conditional (6) is the catoptrical necessary condition that more effectively is taken into reflection type liquid crystal display element with projecting lens.In the conditional (6), θ still, in fact produces aberration if the aberrationless lens can be certain according to image height, can change in image height or zoom etc.If break away from this condition, then can not make the brightness that is projected in the image on the screen abundant.
Generally, because under maximum image height y, light quantity minimum on every side, therefore, if affluence is arranged, then can under whole image heights, not satisfy conditional (6) in intermediary image senior middle school light quantity, therefore, the lens unit of motionless positive light coke is desirable when the reduced side configuration zoom of above-mentioned projecting lens.
Conditional (7) is when keeping suitable back focal length, realizes the condition of bright projecting lens.If optical axis center and periphery at liquid crystal display cells can not be taken into light beam with suitable angle in projecting lens, then become half-light and learn system.Specifically, from liquid crystal display cells with the angle of deferring to the F number to projecting lens irradiation optical axis center.(F number=1/ (2sin ρ): optical axis ± ρ is a subtended angle of going up light beam from the axle of liquid crystal display cells).In addition, if peripheral position aperture opening ratio is big, then use with optical axis on equal angular illumination peripheral part.Therefore, if the scope of disengaging condition (7) is difficult to become clear as projecting lens.
At this moment, in order to reach bright optical system, the F number is being desirable below 3.
The diameter D of the said lens of conditional (7) is meant for the effective diameter D ∈ of these lens big by about 3% to 5%.
Conditional (8) is to be used for the condition that peripheral light amount is suitably set on brightness ground.If the lower limit of disengaging condition (8), peripheral light amount deficiency not only, and be difficult to add the length of the pupil that grows to periphery.If the disengaging upper limit, lens combination can maximize, and is unfavorable.
Conditional (9) is suitably to keep entering into the interval that look separates, look synthesizes the back focal length of the prism that uses, if suitably set the necessary formula of the focal distance f k of the lens unit that above-mentioned projecting lens is provided with in reduced side. break away from this formula, the mobile of pupil location can become big during zoom, and pupil can not be set to (the reduced side heart far away place) at a distance.
Conditional (10) is for effective picture garden, is the condition that is used for suitably so that effective size configure look separates, the prism of look synthesis system is sent out.If surpass the upper limit, then can not guarantee the back focal length that suits, if surpass lower limit then can maximize.
Below, the lens data of the numerical value embodiment 4～13 of corresponding embodiment 4～13 is shown.Table 2 shows the result who has calculated the value of above-mentioned each conditional for each embodiment.
Numerical value embodiment 5
Numerical value embodiment 6
Numerical value embodiment 7
Numerical value embodiment 9
Numerical value embodiment 10
Numerical value embodiment 11
Numerical value embodiment 12
Numerical value embodiment 13
Table 2
Figure 27 is in the projector (portrait projection arrangement) of the liquid crystal display cells that uses reflection-type, has been suitable for the skeleton diagram at main position of the example of varifocal optical system of the present invention or projection optical system.
The light beam that sends from lamp optical system 101, after the beam splitter reflection, reflect again after inciding reflective liquid crystal display screen 103, thereafter, pass through optical splitter 102 with the light beam after LCDs 103 modulation, incide the projection optical system 104 that constitutes by the projecting lens shown in zoom lens shown in the embodiment 1～3 or the embodiment 4～13, by projection optical system 104, according to the portrait information projection of LCDs 103 to screen 105.
Claims (6)
1, a kind of projection optical system, this system to the projecting plane, is characterized in that the original image enlarging projection:
Possess a plurality of lens units, the interval of these a plurality of lens units changes when zoom,
Wherein, the air conversion back focal length of above-mentioned projection optical system is more than 2.5 times or 2.5 times of diameter at effective image circle of original image position, and when the diameter of its effective image circle is designated as
When being designated as tk to the distance of the short focal length extremity of the position of the paraxial pupil of seeing from above-mentioned original image one side, meet the following conditions from above-mentioned original image position:
2, projection optical system according to claim 1 is characterized in that:
In above-mentioned a plurality of lens unit, the lens unit that disposes on the position on the most approaching above-mentioned projecting plane has negative focal power, the lens unit that disposes on the position of the most approaching above-mentioned original image has positive focal power, and is in motionless state during at zoom at the lens unit that disposes on the position of the most approaching above-mentioned original image.
3, projection optical system according to claim 1 is characterized in that:
When the angle that the face normal in the chief ray of the image height of the maximum in the above-mentioned original image position and the above-mentioned original image position is constituted is designated as θ, meet the following conditions:
|θ|<0.8°。
4, projection optical system according to claim 1 is characterized in that:
The diameter of the lens element that disposes on the position at the most approaching above-mentioned original image is designated as D, when the air conversion back focal length of above-mentioned projection optical system is designated as bf, meets the following conditions:
6<D/bf<0.92。
5, projection optical system according to claim 1 is characterized in that:
When the diameter of the lens element that disposes on the position at the most approaching above-mentioned original image is designated as D, meet the following conditions:
6, a kind of image projection device is characterized in that possessing:
The image-displaying member that shows original image;
This original image is projected to the described projection optical system of claim 1 on the projecting plane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003207160A JP4418650B2 (en) | 2003-08-11 | 2003-08-11 | Zoom lens and image projection apparatus having the same |
| JP207160/2003 | 2003-08-11 | ||
| JP337564/2003 | 2003-09-29 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100565978A Division CN1297835C (en) | 2003-08-11 | 2004-08-11 | Variable-focus optical system, projection optical system and image projection device using said system |
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| Publication Number | Publication Date |
|---|---|
| CN101078807A CN101078807A (en) | 2007-11-28 |
| CN100543510C true CN100543510C (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101075509A Expired - Fee Related CN100543510C (en) | 2003-08-11 | 2004-08-11 | Projection optical system and use the image projection device of this system |
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| CN (1) | CN100543510C (en) |
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|---|---|---|---|---|
| JP4874683B2 (en) | 2006-03-22 | 2012-02-15 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| JP4919392B2 (en) | 2006-05-10 | 2012-04-18 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| JP5053680B2 (en) * | 2007-03-29 | 2012-10-17 | キヤノン株式会社 | Image projection optical system and image projection apparatus |
| CN101556424B (en) * | 2009-02-11 | 2011-02-16 | 苏州佳世达光电有限公司 | Projecting apparatus |
| JP5345890B2 (en) | 2009-04-28 | 2013-11-20 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| JP5363202B2 (en) | 2009-06-08 | 2013-12-11 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
| CN203786378U (en) | 2011-10-26 | 2014-08-20 | 富士胶片株式会社 | Zooming lens for projection and projection-type display device |
| JP6391315B2 (en) * | 2014-06-25 | 2018-09-19 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081389A (en) * | 1997-07-31 | 2000-06-27 | Canon Kabushiki Kaisha | Zoom lens of retrofocus type |
| US6283509B1 (en) * | 1995-11-03 | 2001-09-04 | Giesecke & Devrient Gmbh | Data carrier with an optically variable element |
-
2003
- 2003-08-11 JP JP2003207160A patent/JP4418650B2/en not_active Expired - Fee Related
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2004
- 2004-08-11 CN CNB2006101075509A patent/CN100543510C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6283509B1 (en) * | 1995-11-03 | 2001-09-04 | Giesecke & Devrient Gmbh | Data carrier with an optically variable element |
| US6081389A (en) * | 1997-07-31 | 2000-06-27 | Canon Kabushiki Kaisha | Zoom lens of retrofocus type |
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|---|---|
| JP4418650B2 (en) | 2010-02-17 |
| CN101078807A (en) | 2007-11-28 |
| JP2005062226A (en) | 2005-03-10 |
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