CN100376914C - Zooming-projection camera lens - Google Patents

Abstract

The present invention discloses zooming projection lens capable of installing in projection display device. Zooming projector lens includes first lens assembly having negative dioptre and second lens assembly having positive dioptre, wherein first lens assembly consisting of plurality of lens near by image surface and capable of moving along optical axis, second lens assembly consisting of plurality of lens near by object plane and capable of moving along optical axis, one aperture stop set between two adjacent lens of second lens assembly, said aperture stop capable of moving along with second lens assembly, said zooming projector lens capable of correcting aberration, thereby raising projection quality.

Description

Zooming-projection camera lens

[technical field]

The present invention relates to a kind of Zooming-projection camera lens, refer to especially a kind of applicable to projection arrangement the Projection Display optical system and the Zooming-projection camera lens in the image capture optical system of image capture unit.

[background technology]

Projector can be divided into CRT (Cathode Ray Tube) projector, LCD (Liquid CrystalDisplay) projector, DLP (Digital Light Processing) projector and LCoS (Liquid Crystalon Silicon) projector, these projectors all are modes of utilizing optical projection, and image is incident upon on large-sized screen.For example, DLP projector is as the light valve imager with DMD (Digital Micormirror Device), its image-forming principle is by the rotation of DMD micro-mirror device (± 10 °) control reflection of light direction, the break-make of this signal of may command like this, and then by optical lens the imaging on the DMD micro-mirror device is projected on the screen.

Depend primarily on the crucial projection imaging assembly of projector by the picture quality of projector projection, but second key factor then is the type of projection lens.Generally speaking, single set of contact lenses can so that picture show at middle section fine, but when light and picture when the All Ranges of screen launches, need several set of contact lenses of employing could make edge picture and middle section at screen be consistent.And, if will when narrow space obtains big picture, need select the projector that is furnished with wide-angle lens for use, so just can obtain bigger projected picture size at very short projector distance; And under the far situation of projector distance, during as inner projection at the cinema, seek out the picture of suitable size, and just need to select the projector that is furnished with zoom lens far away, so just can also can obtain appropriate screen size and quality at projector distance far away.

The design of relevant projection lens is at United States Patent (USP) the 6th, 590, disclose to some extent in No. 716, this patent has mainly disclosed a kind of Zooming-projection camera lens that is adapted at using in the projector, it comprises second lens combination that has negative dioptric first lens combination, have positive diopter, has negative dioptric the 3rd lens combination and have the 4th lens combination of positive diopter, when this projecting zoom lens is arranged on the wide-angle multiplying power scope, can suppress the formation of hot spot effectively.But this Zooming-projection camera lens is to have adopted four lens combination to improve its projection quality, not only increases the lens cost of projector, but also influences the trend of projector to the miniaturization development.

Another United States Patent (USP) the 5th, 619, No. 381 is to have disclosed a kind of biasing Zooming-projection camera lens that is used for reflective light modulators, it includes two groups of movably lens combination, be respectively to have negative dioptric zoom lens group and have the compensator group of positive diopter, and zoom lens group and compensator group all at least respectively are provided with an aplanat, can be so that projected image has low distortion and high-resolution advantage by the relative position of adjusting between two lens combination.But this patent has only been done general introduction to the structure and the function of projection lens, and concrete design conditions and parameter value are not then done any explanation, therefore also needs further research to solve the Aberration Problem that still exists at present.

[summary of the invention]

Fundamental purpose of the present invention is to provide a kind of Zooming-projection camera lens of compact, and it can effectively proofread and correct various aberrations, improves image quality.

Another object of the present invention is to provide a kind of Projection Display optical system with Zooming-projection camera lens, the structure miniaturization of this optical system, and can obtain high-quality image.

A further object of the present invention is to provide a kind of image capture optical system with Zooming-projection camera lens, the structure miniaturization of this optical system, and can obtain high-quality image.

According to above-mentioned purpose of the present invention, the invention provides a kind of Zooming-projection camera lens, it comprises having negative dioptric first lens combination and have second lens combination of positive diopter, and wherein first lens combination is made up of several eyeglasses, and it is close to image planes and installs and can move along optical axis; Second lens combination is made up of several eyeglasses, and it is close to object plane and installs and can move along optical axis; Second lens combination wherein also be provided with an aperture diaphragm between the two adjacent eyeglasses, it can move with second lens combination; This Zooming-projection camera lens also need satisfy just aberration correction well of following condition:

$-0.90<\frac{P2}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="C20051007936500141.png,C20051007936500191.png"\; state="\{\{state\}\}">P</figure-callout>}1}<-0.78---\left(1\right)$

$-1.99<\frac{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="C20051007936500141.png,C20051007936500191.png"\; state="\{\{state\}\}">P</figure-callout>}1}{\mathrm{PF}}<-1.67---\left(2\right)$

$1.50<\frac{P2}{\mathrm{PF}}<1.55---\left(3\right)$

$0.58<\frac{\mathrm{PF}}{\mathrm{BF}}<0.68---\left(4\right)$

$5.37<\frac{\mathrm{TT}}{\mathrm{PF}}<5.82---\left(5\right)$

$3.40<\frac{\mathrm{TT}}{\mathrm{BF}}<3.80---\left(6\right)$

$-1.34<\frac{\mathrm{EX}}{\mathrm{BF}}<-1.13---\left(7\right)$

In (7), P1 represents the diopter of first lens combination in above-mentioned condition (1); P2 represents the diopter of second lens combination; Focal length when PF represents that Zooming-projection camera lens is positioned at wide-angle side; Back focal length when BF represents that Zooming-projection camera lens is positioned at wide-angle side; Camera lens length overall when TT represents that Zooming-projection camera lens is positioned at wide-angle side; The position of the outgoing pupil when EX represents that Zooming-projection camera lens is positioned at wide-angle side.

Each eyeglass of above-mentioned first, second lens combination adopts global surface glass nitre material to process.

Between above-mentioned second lens combination and object plane, also be provided with a glass plate.

When being installed on this Zooming-projection camera lens on the projection display equipment, object plane is meant the imager of this projection display equipment, and image planes are meant that image can throw screen thereon.

When this Zooming-projection camera lens makes it hold variation from wide-angle side to dolly-out,ing dolly-back, first lens combination will move to object plane from image planes, and second lens combination will move to image planes from object plane, and the relative distance between first and second lens combination is dwindled.

The focal length value F of above-mentioned Zooming-projection camera lens can conversion between 21.333mm (W)～24.4907mm (M)～27.6359mm (T), and effective aperture FNO then can conversion between 2.40 (W)～2.57 (M)～2.73 (T).

The focal length value F of above-mentioned Zooming-projection camera lens can also conversion between 20.439mm (W)～21.852mm (M)～23.545mm (T), and effective aperture FNO then can conversion between 2.61 (W)～2.69 (M)～2.78 (T).

The focal length value F of above-mentioned Zooming-projection camera lens can also conversion between 23.700mm (W)～26.006mm (M)～28.523mm (T), and effective aperture FNO then can conversion between 2.48 (W)～2.59 (M)～2.71 (T).

Compared to prior art, Zooming-projection camera lens of the present invention is to have adopted to have negative dioptric first lens combination and have second lens combination of positive diopter, can reach the effect of compact conformation, and because Zooming-projection camera lens of the present invention has also satisfied seven necessary conditions when design, aberration can well be proofreaied and correct, thereby improves projection quality.

[description of drawings]

Fig. 1 is the structural representation of first embodiment of Zooming-projection camera lens of the present invention.

Fig. 2 A to Fig. 2 D is longitudinal aberration, lateral chromatic aberration, filed curvature and the MTF curve synoptic diagram of the Zooming-projection camera lens of first embodiment when being in wide-angle multiplying power state.

Fig. 3 A to Fig. 3 D is longitudinal aberration, lateral chromatic aberration, filed curvature and the MTF curve synoptic diagram of the Zooming-projection camera lens of first embodiment when mediating the multiplying power state.

Fig. 4 A to Fig. 4 D is that the Zooming-projection camera lens of first embodiment is in longitudinal aberration, lateral chromatic aberration, filed curvature and the MTF curve synoptic diagram when dolly-out,ing dolly-back the multiplying power state.

Fig. 5 is the structural representation of second embodiment of Zooming-projection camera lens of the present invention.

Fig. 6 A to Fig. 6 D is the Zooming-projection camera lens of second embodiment each aberration curve synoptic diagram when being in wide-angle multiplying power state.

Fig. 7 A to Fig. 7 D is the Zooming-projection camera lens of second embodiment each aberration curve synoptic diagram when mediating the multiplying power state.

Fig. 8 A to Fig. 8 D is that the Zooming-projection camera lens of second embodiment is in each the aberration curve synoptic diagram when dolly-out,ing dolly-back the multiplying power state.

Fig. 9 is the structural representation of the 3rd embodiment of Zooming-projection camera lens of the present invention.

Figure 10 A to Figure 10 D is the Zooming-projection camera lens of the 3rd embodiment each aberration curve synoptic diagram when being in wide-angle multiplying power state.

Figure 11 A to Figure 11 D is the Zooming-projection camera lens of the 3rd embodiment each aberration curve synoptic diagram when mediating the multiplying power state.

Figure 12 A to Figure 12 D is that the Zooming-projection camera lens of the 3rd embodiment is in each the aberration curve synoptic diagram when dolly-out,ing dolly-back the multiplying power state.

[embodiment]

Please join shown in Figure 1, Zooming-projection camera lens 1 of the present invention can be installed in the DLP projector, be used for the image on the DMD imager is projected on the screen, this Zooming-projection camera lens 1 comprises having negative dioptric first lens combination 10 and have second lens combination 20 of positive diopter, wherein first lens combination 10 is made up of several eyeglasses, it is installed on screen side (left side as shown in fig. 1) and can moves along optical axis in the scope of the first variable spacing M1, and so-called screen side is meant that image can throw a plane thereon; Second lens combination 20 is made up of several eyeglasses, and it is installed on picture planar side (right side as shown in fig. 1) and can moves the so-called installation site that is meant DMD imager (not shown) as planar side along optical axis in the scope of the second variable spacing M2.Other has an aperture diaphragm 30 is between two eyeglasses 21 and 22 of second lens combination 20, and can move with second lens combination 20.One glass plate 40 also is installed between second lens combination 20 and imager, is used for improving the received image effect of Zooming-projection camera lens 1.Each eyeglass of described first, second lens combination 10,20 adopts global surface glass nitre material to process, and Zooming-projection camera lens 1 has resistant to elevated temperatures characteristic and temperature variation is less to its performance impact like this.Again because of Zooming-projection camera lens 1 of the present invention is the combination of having adopted positive lens groups (second lens combination 20) and negative lens group (first lens combination 10), therefore can be so that the compact conformation of whole Zooming-projection camera lens.

The position situation of two lens combination when in Fig. 1, only expressing Zooming-projection camera lens 1 and being in wide-angle side, when regulate Zooming-projection camera lens 1 make its from wide-angle side (being the wide-angle multiplying power) when the end of dolly-out,ing dolly-back (multiplying power of promptly dolly-out,ing dolly-back) changes, first lens combination 10 will be from screen side to moving as planar side, and second lens combination 20 will be from moving to screen side as planar side, and the relative distance between first and second lens combination 10,20 is dwindled.In addition, when this Zooming-projection camera lens 1 is when being applied in the Projection Display optical system of reflection-type, DLP projector for example, for improving projection quality, must make the input path and the interval between the emitting light path that are incident on the reflection-type imager (as: DMD imager) strengthen to form isolation, can avoid emitting light path to be disturbed like this by other light source, simultaneously also will make the Projection Display optical system of this reflection-type that sufficiently long back focal length must be arranged, the concrete qualifications of relevant this back focal length is detailed later.

Please join Fig. 5 and Zooming-projection camera lens of the present invention 1 ', 1 shown in Figure 9 " second and third embodiment; the difference of the Zooming-projection camera lens 1 of itself and first embodiment only is: first lens combination 10 ', 10 " with second lens combination 20 ', 20 " eyeglass quantity and structure slightly variant (as Fig. 1, Fig. 5 and shown in Figure 9), but all need satisfy following condition by three Zooming-projection camera lens that embodiment disclosed can proofread and correct various aberrations well:

$-0.90<\frac{P2}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="C20051007936500141.png,C20051007936500191.png"\; state="\{\{state\}\}">P</figure-callout>}1}<-0.78---\left(1\right)$

$-1.99<\frac{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="C20051007936500141.png,C20051007936500191.png"\; state="\{\{state\}\}">P</figure-callout>}1}{\mathrm{PF}}<-1.67---\left(2\right)$

$1.50<\frac{P2}{\mathrm{PF}}<1.55---\left(3\right)$

$0.58<\frac{\mathrm{PF}}{\mathrm{BF}}<0.68---\left(4\right)$

$5.37<\frac{\mathrm{TT}}{\mathrm{PF}}<5.82---\left(5\right)$

$3.40<\frac{\mathrm{TT}}{\mathrm{BF}}<3.80---\left(6\right)$

$-1.34<\frac{\mathrm{EX}}{\mathrm{BF}}<-1.13---\left(7\right)$

Above-mentioned expression formula (1) is in (7), and P1 represents the diopter of first lens combination; P2 represents the diopter of second lens combination; Focal length when PF represents that Zooming-projection camera lens is positioned at wide-angle side; Back focal length when BF represents that Zooming-projection camera lens is positioned at wide-angle side; Camera lens length overall when TT represents that Zooming-projection camera lens is positioned at wide-angle side; The position of the outgoing pupil when EX represents that Zooming-projection camera lens is positioned at wide-angle side.

If above-mentioned about Zooming- projection camera lens 1,1 ' and 1 " performance index (as: P1, P2, PF, BF, TT, EX) surpass the following of expression formula (1) and (2) and prescribe a time limit; by second lens combination 20,20 ' and 20 " filed curvature and other aberration that are produced will be very big, to such an extent as to be difficult to utilize first lens combination 10,10 ' and 10 " with its correction; And if surpass expression formula (1) and (2) go up in limited time first lens combination 10,10 ' and 10 " mobile range will be very big, therefore will cause the length overall of Zooming-projection camera lens excessive.

If above-mentioned relevant Zooming- projection camera lens 1,1 ' and 1 " performance index surpass expression formula (3) following in limited time, first lens combination 10,10 ' and 10 " mobile range will be very big, therefore will cause the length overall of Zooming-projection camera lens excessive; And if surpass going up in limited time of this expression formula (3), by second lens combination 20,20 ' and 20 " lateral chromatic aberration that produced will be by exaggerated correction.

If above-mentioned relevant Zooming- projection camera lens 1,1 ' and 1 " performance index surpass going up in limited time of expression formula (4), (5) and (6), the mobile spoke degree of back focal length that is positioned at the whole Zooming-projection camera lens of wide-angle side will be excessive; And if surpassing the following of expression formula (4), (5) and (6) prescribes a time limit, the diopter of whole Zooming-projection camera lens can be too low, thereby influence its optical property.

If above-mentioned relevant Zooming- projection camera lens 1,1 ' and 1 " performance index surpass going up in limited time of expression formula (7), the diopter of whole Zooming-projection camera lens can be too low and influences its optical property; And if surpassing the following of expression formula (7) prescribes a time limit, whole in fact Zooming-projection camera lens will become a heart zoom lens far away.

In fact, by three Zooming-projection camera lens of the present invention that embodiment disclosed 1,1 ' and 1 " all formed the inverted structure of dolly-out,ing dolly-back; and wherein screen side (being that image can throw plane thereon) can be used as image planes; and the picture planar side (is the display device surface, for example: the DMD imager) then can be used as an object plane.Yet when display device side was assessed the optical property of Zooming-projection camera lens, screen side was to be regarded as object plane, Zooming-projection camera lens be taken as the epitome optical system (reduction optical systems, ROS).

In first embodiment, Zooming-projection camera lens 1 of the present invention comprises first lens combination 10 with four eyeglasses, second lens combination 20 with seven eyeglasses and a glass plate 40, and the values of the structural parameters of each glass mirror can be with reference to shown in the following table:

Focal length value F=21.333mm (W)～24.4907mm (M)～27.6359mm (T)
					Effective aperture FNO=2.40 (W)～2.57 (M)～2.73 (T)
The surface sequence number	Radius-of-curvature (mm) (Radius)	Thickness (mm) (Thickness)	Refractive index (Nd)	Abbe coefficient (Vd)
					R1	81.7	4.46	1.58913	61.20

R2	∞	0.10
					R3	52.3	2.55	1.48749	70.21
R4	20.0	8.38
					R5	-172.4	1.60	1.83481	42.72
R6	26.4	10.52
					R7	40.3	9.60	1.84666	23.80
R8	85.81	15.961(W)～9.094 (M)～3.813(T)
					R9	70.2	3.78	1.72916	54.68
R10	-70.2	0.10
					R11	36.6	2.61	1.83481	42.72
R12	158.9	3.00
					R13	-43	7.24	1.80440	39.58
R14	15.1	0
					R15	15.1	9.50	1.49700	81.61
R16	-106	0.10
					R17	26.2	3.44	1.83481	42.72
R18	-44.8	0.11
					R19	-139.4	0.90	1.68893	31.10
R20	18	1.73
					R21	67.7	2.02	1.80400	46.58
R22	-67.7	33.00(W)～35.92 (M)～38.83(T)
					R23	∞	3.00	1.48749	70.41
R24	∞	0.50

In the last table, W represents the situation of Zooming-projection camera lens when wide-angle multiplying power state; Situation when M represents that Zooming-projection camera lens mediates standard multiplying power state; T represents the situation of Zooming-projection camera lens when dolly-out,ing dolly-back the multiplying power state; Surface sequence number R1 to R24 represents each lens surface from screen side to the picture planar side successively; Thickness is represented the distance of a lens surface to the adjacent mirror surface.Design according to last table numerical value, the various aberrations of Zooming-projection camera lens 1 of the present invention can effectively be proofreaied and correct, shown in Fig. 2 A to Fig. 2 D, Fig. 3 A to Fig. 3 D, Fig. 4 A to Fig. 4 D.

In a second embodiment, Zooming-projection camera lens 1 ' of the present invention comprises first lens combination 10 ' with four eyeglasses, second lens combination 20 ' with six eyeglasses and a glass plate 40 ', and the values of the structural parameters of each glass mirror can be with reference to shown in the following table:

Focal length value F=20.439mm (W)～21.852mm (M)～23.545mm (T)
					Effective aperture FNO=2.61 (W)～2.69 (M)～2.78 (T)
The surface sequence number	Radius-of-curvature (mm) (Radius)	Thickness (mm) (Thickness)	Refractive index (Nd)	Abbe coefficient (Vd)
					R1	105.9	3.1	1.72916	54.68
R2	∞	0.10
					R3	120.4	9.58	1.74950	35.30
R4	20.1	6.28
					R5	-149	1.40	1.49700	81.61
R6	30.3	9.93
					R7	39.0	8.05	1.84666	23.80
R8	71.2	11.216(W)～7.658 (M)～3.955(T)
					R9	89.9	3.02	1.84666	23.80
R10	-70.2	5.32
					R11	28.7	2.44	1.83481	54.68
R12	187.9	4.12
					R13	-41.5	9.70	1.69895	30.10
R14	28.8	5.12
					R15	248.3	1.85	1.49700	81.61
R16	-33.4	0.10
					R17	34.4	0.80	1.67270	32.10
R18	19.2	0
					R19	19.2	3.38	1.49700	81.61
R20	-71.5	27.03(W)～28.31 (M)～29.86(T)
					R21	∞	3.00	1.48749	70.41
R22	∞	0.50

In the last table, surperficial sequence number R1 to R22 represents each lens surface from screen side to the picture planar side successively; Thickness is represented the distance of described lens surface to next lens surface.Design according to last table numerical value, the various aberrations of Zooming-projection camera lens 1 ' of the present invention can effectively be proofreaied and correct, shown in Fig. 6 A to Fig. 6 D, Fig. 7 A to Fig. 7 D, Fig. 8 A to Fig. 8 D.

In the 3rd embodiment, Zooming-projection camera lens 1 of the present invention " comprise first lens combination 10 with five eyeglasses ", have second lens combination 20 of eight eyeglasses " and a glass plate 40 ", the values of the structural parameters of each glass mirror can be with reference to shown in the following table:

Focal length value F=23.700mm (W)～26.006mm (M)～28.523mm (T)
					Effective aperture FNO=2.48 (W)～2.59 (M)～2.71 (T)
The surface sequence number	Radius-of-curvature (mm) (Radius)	Thickness (mm) (Thickness)	Refractive index (Nd)	Abbe coefficient (Vd)
					R1	117.1	3.45	1.72916	54.68
R2	∞	0.10
					R3	92.5	2.66	1.69680	55.53
R4	22.2	10.81
					R5	-63.2	1.40	1.59270	35.30
R6	46.4	5.00
					R7	-85.8	7.51	1.83481	42.72
R8	-59	0.10
					R9	41.7	4.17	1.84666	23.80
R10	65.3	15.13(W)～8.62 (M)～2.72(T)
					R11	56.9	3.27	1.83481	42.72
R12	2134.1	9.64
					R13	95.4	2.10	1.72916	54.68
R14	-181.9	0.10
					R15	36.8	1.85	1.72916	54.68
R16	87	2.04
					R17	-48.2	5.37	1.80440	39.58
R18	15.7	0
					R19	15.7	8.70	1.49700	81.61
R20	-87.8	0.36
					R21	25.7	3.56	1.83481	42.72
R22	-52.4	0.14
					R23	-308.3	0.80	1.64769	33.80
R24	17.0	2.30
					R25	87.2	1.71	1.48749	70.41

R26	-87.2	31.50(W)～33.56 (M)～35.38(T)
					R27	∞	3.00	1.48749	70.41
R28	∞	0.50

In the last table, surperficial sequence number R1 to R28 represents each lens surface from screen side to the picture planar side successively; Thickness is represented the distance on described lens surface and adjacent mirror surface.Design Zooming-projection camera lens 1 of the present invention according to last table numerical value " various aberrations can effectively be proofreaied and correct, shown in Figure 10 A to Figure 10 D, Figure 11 A to Figure 11 D, Figure 12 A to Figure 12 D figure.

Zooming-projection camera lens of the present invention is applied on the DMD projection arrangement, not only can obtain high quality images so that the miniaturization of DMD projection arrangement can also improve device performance.In addition, Zooming-projection camera lens of the present invention can also be applied in other the Projection Display optical system and image capture optical system, to improve the optical property of these optical systems.

Claims (12)

1. Zooming-projection camera lens, it comprises having negative dioptric first lens combination and have second lens combination of positive diopter, and wherein first lens combination is made up of several eyeglasses, and it is close to image planes and installs also and can move along optical axis; Second lens combination is made up of several eyeglasses, and it is close to object plane and installs and can move along optical axis; Second lens combination wherein also be provided with an aperture diaphragm between the two adjacent eyeglasses, this aperture diaphragm can move with second lens combination; It is characterized in that: Zooming-projection camera lens need satisfy following condition:

$-0.90<\frac{P2}{P1}<-0.78---\left(1\right)$

$-1.99<\frac{P1}{\mathrm{PF}}<-1.67---\left(2\right)$

$1.50<\frac{P2}{\mathrm{PF}}<1.55---\left(3\right)$

$0.58<\frac{\mathrm{PF}}{\mathrm{BF}}<0.68---\left(4\right)$

$5.37<\frac{\mathrm{TT}}{\mathrm{PF}}<5.82---\left(5\right)$

$3.40<\frac{\mathrm{TT}}{\mathrm{BF}}<3.80---\left(6\right)$

$-1.34<\frac{\mathrm{EX}}{\mathrm{BF}}<-1.13---\left(7\right)$

In (7), P1 represents the diopter of first lens combination in above-mentioned condition (1); P2 represents the diopter of second lens combination; Focal length when PF represents that Zooming-projection camera lens is positioned at wide-angle side; Back focal length when BF represents that Zooming-projection camera lens is positioned at wide-angle side; Camera lens length overall when TT represents that Zooming-projection camera lens is positioned at wide-angle side; The position of the outgoing pupil when EX represents that Zooming-projection camera lens is positioned at wide-angle side.

2. Zooming-projection camera lens as claimed in claim 1 is characterized in that: each eyeglass system of first, second lens combination adopts global surface glass nitre material to process.

3. Zooming-projection camera lens as claimed in claim 1 is characterized in that: be provided with a glass plate between second lens combination and object plane.

4. Zooming-projection camera lens as claimed in claim 1 is characterized in that: when being installed on this Zooming-projection camera lens on the projection display equipment, object plane is meant the imager of this projection display equipment, and image planes are meant that image can throw screen thereon.

5. Zooming-projection camera lens as claimed in claim 1, it is characterized in that: when this Zooming-projection camera lens makes it hold variation from wide-angle side to dolly-out,ing dolly-back, first lens combination will move to object plane from image planes, and second lens combination will move to image planes from object plane, and the relative distance between first and second lens combination is dwindled.

6. Zooming-projection camera lens as claimed in claim 5, it is characterized in that: the focal length value F of this Zooming-projection camera lens can conversion between 21.333mm (W)～24.4907mm (M)～27.6359mm (T), and effective aperture FNO then can conversion between 2.40 (W)～2.57 (M)～2.73 (T).

7. Zooming-projection camera lens as claimed in claim 5, it is characterized in that: the focal length value F of this Zooming-projection camera lens can conversion between 20.439mm (W)～21.852mm (M)～23.545mm (T), and effective aperture FNO then can conversion between 2.61 (W)～2.69 (M)～2.78 (T).

8. Zooming-projection camera lens as claimed in claim 5, it is characterized in that: the focal length value F of this Zooming-projection camera lens can conversion between 23.700mm (W)～26.006mm (M)～28.523mm (T), and effective aperture FNO then can conversion between 2.48 (W)～2.59 (M)～2.71 (T).

9. Projection Display optical system, it includes an imager that can form image at least, it is characterized in that: adopted one as any described Zooming-projection camera lens in the claim 1 to 8 in this Projection Display optical system.

10. Projection Display optical system as claimed in claim 9 is characterized in that: imager is the reflection-type imager.

11. Projection Display optical system as claimed in claim 10 is characterized in that: imager is the DMD micro-mirror device.

12. an image capture optical system is characterized in that: this image capture optical system has one at least as any described Zooming-projection camera lens in the claim 1 to 8.

Images