TW201219877A - composed of two lens groups to achieve variable focus with small volume and high optical efficiency - Google Patents

Abstract

The present invention discloses a variable-focus projection lens, which comprises a first lens group and a second lens group sequentially arranged from an imaging side to an image source side along an optical axis. In which, the first lens group has a negative diopter, and the first three lenses in the first lens group counting from the imaging side to the image source side have sequentially negative, positive and negative diopter; the second lens group has a positive diopter, and the last lens in the second lens group counting from the imaging side to the image source side has a positive diopter, and has at least one surface being an aspherical surface. Additionally, the first lens group may be moved between the imaging side and the second lens group along the optical axis, so as to achieve the objects of variable focus and miniaturization.

Description

201219877 VI. Description of the invention: [Technical field to which the invention pertains] A zoom projection is related to a projection lens, and more specifically to a lens. [Prior Art] In recent years, with the advancement of imaging technology, more and more people use projectors for briefing, video, conferences or viewing. In order to make the projector suitable for various settings (such as living room, conference room or shooting), the lens of the projector has the function of changing the focal length. _ The projected image can be changed according to different setting environments. In addition, in order to make the projection of the limbs and the use of the lens, the volume of the lens will be greatly reduced to meet the demand for miniaturization and weight reduction, and in addition to miniaturization and weight reduction, With higher optical performance', it can achieve high resolution and high contrast image display. Therefore, # + type and high optical performance are two essential elements for zoom projection lenses. However, the zoom projection lens of the projector is not only the use of the upper mirror group, but also the real miniaturization of the silk. Or for the purpose of miniaturizing the surface, the secret use of several lenses has made it impossible for its school to be effectively improved. SUMMARY OF THE INVENTION The main object of the present invention is to provide a zoom projection lens. The 201219877 head is composed of two groups of mirrors, which are not only small in size but also have high optical performance. In order to achieve the above object, the zoom projection lens provided by the present invention along an optical axis and from the - imaging side to the image sequence is arranged in a sequence of - a mirror group and a second mirror group; wherein the first The mirror group has a negative refractive power; the first mirror group is negative, positive and negative in the form of a mirror-like force before the image is calculated by the image, and the second mirror group has a positive refractive power; the second mirror group From the imaging side to the image source (4), the last lens has a positive refractive power, and at least the surface is an aspherical surface; and the 'the first mirror group can be along the light between the pair and the second mirror group The axis moves. Thereby, the first mirror group is moved to achieve the purpose of changing the focal length of the lens. [Embodiment] In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the accompanying drawings.

1 is a lens arrangement diagram of a zoom projection lens j according to a first preferred embodiment of the present invention, which includes one side of the optical axis z and arranged by the side of the wire to the image, and is made of glass. The first mirror group G1 and a second mirror group G2. In addition, the first mirror group G1 can be moved along the optical axis z between the imaging side and the second mirror group G2 to achieve the purpose of changing the focal length of the lens, so that the zoom projection lens i can be according to the first mirror group G1. The position is divided into a wide-angle state, a middle state, and a telephoto (teleph〇t〇) state. Further, a glass cover CG 201219877 (CoverGlass) may be disposed between the second mirror group G2 and the image source side in accordance with the demand for use, which is a flat glass. Wherein: the first mirror group G1 has a negative refractive power and includes a first lens u, a first lens L2, a second lens L3, a fourth lens L4, and a fifth lens L5. The first mirror is a crescent-shaped lens having a negative refractive power, and its convex surface R1 faces the imaging side. The second lens L2 has a positive lenticular lens. The third mirror month L3 is a crescent lens having a negative refractive power, and its convex surface R5 faces the image forming side. The fourth lens w is a biconcave lens having a negative refractive power #. The fifth lens L5 is a single convex lens having a positive refractive power, and its convex surface R9 faces the image forming side. The first mirror group G2 has a positive refractive power and includes a sixth lens. The first lens L7, an eighth lens L8, a ninth lens L9, a tenth lens, and a tenth lens U1. The sixth lens is “having a positive refractive single convex lens” and its convex surface R11 faces the imaging side. The seventh lens π is a biconcave lens having a negative refractive power. The first human lens u is a double convex with positive refractive power. And the thin ST of the vehicle 1 is disposed on the surface R16 of the eighth through. The ninth lens L9 is a crescent lens having a positive refractive power, and the convex surface R17 faces the imaging side. The tenth lens L(1) is A f-concave lens with a negative refractive power. The tenth-lens (3) is a lenticular lens with positive refractive power, and the surface milk and R22 are aspherical surfaces, so that the Weixian lens 1 can effectively mirror The post can correct the aberrations. The Wei projection lens 1 knocks the following conditions: ^ 0) -0.87 < β/f! 《〇76 (2) -2.09 < f!/fw < _185 201219877 (3)1.59^ ^/fw<1 64 (4) 0.70 < fW/bf < 0.71 (5) 6.66 tt/fw < 6.7 (6) 4.7 <tt/bf< 4.74 , Bu ^ ί'Ί , 1 is the first mirror The effective focal length of the group G1; f2 is the 欵隹*, , and moment of the second mirror group G2; fw is the surface of the zoom projection lens 1 in the wide-angle state; bf is the zooming projection The focal length of the lens 1; tt is 彡, the total length of 1. In order to make the zoom projection lens 1 effectively reduce the total length of the lens and increase the back focus length, the zoom projection lens 1 satisfies the following conditions: (7)-1.31 c ex/ Bf < heart 24 (8) 0.787 < lt / tt < 0.789 (9) 1.31 < private ~ < 22 where ex is the exit pupil position of the zoom projection lens 1; It is the zoom The length between the first surface of the projection lens i and the last surface R24; fg is the effective focal length of the eleventh lens U1. The focal length F (value) of the zoom projection lens 1 of the first embodiment of the present invention The aperture FN〇(F_number), the radius of curvature R of the optical axis z of each lens surface, the thickness T of each lens on the optical axis z, and the refractive index of each lens Nd (refractive index) And the Abbe number Vd (Abbenumber) of each lens, as shown in Table 1: Table 1 F=21.75(W)~28.2488(M)~34.077(T) FNO=2.398fW1 ~2.70iMV-2.98m Surface R(mm ) T(mm) Nd Vd Remarks R1 79 2.2 1.846660 23.8 First lens LI R2 43.48 6 201219877 R3 1 83481 42.7 R 4 -572 βρ Γ\ L2 R5 70.4 1.497 81.6 R6 22.8 12.64 Third lens L3 R7 -69.2 1.2 1.741 Fourth lens L4 52.7 R8 40.67

R11 35.7 R12 3.97 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 -59.3 27.95 17.76 -127 20.9 39.3 -34.4 28.5 26.54 -100 1.788 Sixth Lens L6

1.5927 6.1 1.37 6.5 2.2 0.6 0.33 3.1 26 1.7985(W)~6.964(M)~ 11.6386(T) 1.497 81.6 Eighth Lens L8

1.497 81.6 Ninth Lens L9 1-62004 Tenth Lens L10

1.739 49.04 eleventh lens L11 1.48749

The glass cover CG table 1 has a thickness Τ, (W) refers to the distance between the optical axis 该 in the wide-angle state; (Μ) means the zoom projection lens 1 is in the middle (middle) In the state, the distance between the optical axes Z; (τ) refers to the distance between the zoom projection lens 1 on the optical axis Z in the telephoto state

C 7 201219877 Further, the surface depression degree D of the #spherical surface of the eleventh lens L11 of the present embodiment is obtained by the following formula: wherein: D: the degree of depression of the aspherical surface; C: the reciprocal of the radius of curvature; Aperture radius; Κ: conic coefficient; Ε4~Em: various order coefficients of the aperture radius h of the surface. In the present embodiment, the coefficient coefficients K4 to Em of the conic constant K and the surface aperture radius η of each aspherical surface are as shown in Table 2:

With the above arrangement of the lens and the aperture, the zoom projection lens 1 of the present embodiment can effectively reduce the volume to meet the demand for light weight, and the zoom projection lens 1 has an image quality in a wide-angle state. The requirements can also be met 'this can be seen from Figure 2A to Figure 2D. 2A is a longitudinal chromatic aberration diagram of the zoom projection lens 1 of the present embodiment; FIG. 2B is a lateral chromatic aberration 201219877 diagram of the zoom projection lens 1 of the present embodiment; and FIG. 2C is the present embodiment. For example, the field curvature map and the distortion map of the zoom projection lens ;; FIG. 2D shows the spatial frequency modulation transfer function map (Spatial Frequency MTF) of the zoom projection lens 本 of the embodiment. As can be seen from Fig. 2A and Fig. 2B, the longitudinal chromatic aberration of the zoom projection lens 1 of the present embodiment does not exceed 0.07 mm and -0.03 mm ′ at the maximum, and the lateral chromatic aberration does not exceed 4 μη σ_1 μm. As can be seen from Fig. 2C, the maximum field curvature of the zoom projection lens of this embodiment does not exceed 0.10 mm and -0.04 mm, and the distortion variable does not exceed 2%. As can be seen from Fig. 2, the zoom optical projection function of the present embodiment has a modulation optical transfer function value of 50% or more at 60 lP/mm. In addition, the zoom projection lens 1 can also meet the imaging quality in the middie state, as can be seen from Figs. 3A to 3d. As can be seen from Fig. 3a and Fig. 3B, the longitudinal chromatic aberration of the zoom projection lens of the present embodiment does not exceed 0.07 mm and -0.05 mm at the maximum, and the lateral chromatic aberration does not exceed 4 μm and _2 μm at the maximum. It can be seen from Fig. 3C that the maximum field curvature of the 纽 影 本 本 不 不 不 不 不 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 As can be seen from the figure, in the present embodiment, when the f-head is at 6G lp/mm, the value of the modulation optical transfer function is maintained above 4%. Moreover, the zoom projection lens 1 can also meet the requirements on the imaging buckle when in the telephoto state, which can be seen from FIG. 4A to FIG. As can be seen from Figs. 4 and 4B, the longitudinal chromatic aberration of the zoom projection lens 1 of the present embodiment does not exceed 〇. 〇 8 mm and 〇 让 8 so that the lateral chromatic aberration does not exceed the maximum of the shirt and the frame. As can be seen from FIG. 4c, the maximum field curvature of the zoom projection lens 1 of the present embodiment 201219877

Not more than 0.12mm and -〇.12mm, and the distortion variable does not exceed 0.4%. As can be seen from FIG. 4D, when the zoom projection lens 1 of the present embodiment is at 60 lp/mm, the modulation optical transfer function value is maintained at 40% or more. It is apparent that the resolution of the zoom projection lens 1 of the present embodiment is When it is a wide-angle state, a middle state, or a long-range projection (teieph〇t〇) state, it is all in accordance with the standard 0, and is the zoom projection lens of the first embodiment of the present invention.丨; according to the technology of the present invention, a second embodiment of the present invention will be described below with reference to FIG. The zoom projection lens 2 of the present embodiment includes a first mirror group 〇1 and a second mirror group G2 which are arranged along the optical axis Z and are arranged in order from the imaging side to the image source side and are made of glass. In addition, the first mirror group G1 can also move along the optical axis z between the imaging side and the second mirror group G2 to change the focal length of the lens, so that the zoom projection lens can be set according to the first mirror group G1. It is divided into a wide angle state, a middle state, and a tele projection (teieph〇t〇) state. Further, a glass cover CG (cover glass) is provided between the first mirror group G2 and the image source side. The first mirror group G1 has a negative refractive power and includes a first lens Li, a first lens L2, a second lens L3, a fourth lens L4, and a fifth lens L5. The first lens L1 is a crescent lens having a negative refractive power, and the convex surface R1 faces the image forming side. The second lens L2 is a lenticular lens having a positive refractive power. The third lens L3 is a crescent lens having a negative refractive power, and 201219877 has a convex surface R5 facing the imaging side. The fourth lens L4 is a biconcave lens having a negative refractive power. The fifth lens L5 is a single convex lens having a positive refractive power, and its convex surface R9 faces the image forming side.

The second mirror group G2 has a positive refractive power, and includes a sixth lens L6, a brother L7, an eighth lens, a ninth lens L9, a tenth lens tenth lens L11, and a twelfth lens L12. . The sixth lens L6 is a lenticular lens having positive refractive power. The seventh lens L7 $ has a crescent-shaped crescent lens and its convex surface (10) faces the image forming side. The eighth lens L8 is a single concave lens having a negative refractive power, and its concave surface Rls faces the imaging side, the ninth lens L9 is a crescent lens having a negative refractive power, and its concave surface R17 faces the image forming side. The tenth lens L10 is a lenticular lens having a positive refractive power, and the light UST of the zoom projection lens 2 is disposed on the surface R19 of the tenth lens L10. The tenth-lens U1 is a negative refractive power biconcave lens. The eleventh lens L12 is a lenticular lens having a positive refractive power, and the surfaces R23 and R24 are aspherical surfaces. In order to enable the Wei projection surface 2 to mechanically fix the total length of the lens, correct the aberration, and increase the back focus length, the zoom projection lens 2 satisfies the following conditions: (1) -0.87 < f2/fl <.〇>76 (3) 1.59 < f2/fw < 1.64 (5) 6.66 <tt/fw < 6.7 (7) -1.31 <ex/bf<-i.24 (9) 1.31 < fg/fw < 2.2 (2) -2.09 < fl/fw < -1.85 (4) 0.70 < fw/bf < 0.71 (6)4.7 <tt/bf<4.74 (8) 0.787 < lt/tt < 0.789 11 201219877 where ' fi is the effective focal length of the first mirror group G1; β is the effective focal length of the second mirror group G2; (7) is the effective focal length of the Wei projection lens 2 in the wide angle (wide_angle) state; bf is the Wei The focal length of the projection surface 2; Du is the cold, the total length of the projection lens 2; ex is the exit pupil position of the zoom projection lens 2; It is the first surface R1 of the zoom projection lens 2 to The length between the last surface R26; the turtle is the effective focal length of the twelfth lens L12. Focal length F of the zoom projection lens 2 of the second embodiment of the present invention (F〇cus

Length), numerical aperture FNO (F-number), radius of curvature R of the optical axis Z of each lens surface, thickness T of each lens on the optical axis Z, refractive index of each lens Nd (refractive index) and the Abbe number Vd (Abbenumber) of each lens are shown in Table 3: Table 3 F=5 n.65(W), 28·0696(M)~34. 0994(T) FN0= 2.4CW)~2. 754rMV3. 096(Τ) Surface R(mm) T(mm) Nd Vd Remarks R1 77.48 2 1.846660 23.8 First lens LI R2 42.5 7. 91 R3 105 7.3 1.83481 42.7 Second lens L2 R4 -281 0.2 R5 71 2.8 1.497 81.6 Third lens L3 R6 23.2 13 R7 -62.7 1.2 1.72916 54.7 Fourth lens L4 R8 42.64 5.4 R9 49.67 7 1.76182 26.5 Fifth lens L5 R10 〇〇26.846804(W)~11.41521(M)~2. 212906(T) R11 26.2 8.2 1.497 81.6 Sixth lens L6 R12 -376 1.4 R13 38.2 7 1.788 47.4 Seventh lens L7 12 201219877 R14 51.4 4.7 R15 -54.5 2.3 1.5927 35.3 Eighth lens L8 R16 〇〇1.87 R17 -29 0.6 1.5927 35.3 Nine lens L9 R18 -112.8 0.2 R19 22.9 3.7 1.72916 54.7 Tenth lens L10 light ST R20 -43 0. 25 R21 -78.3 2.7 1.72825 28.5 Eleventh lens L11 R22 25 0.8 R23 30.64 7 1.80191 40.89 Twelfth lens L12 R24 -100 26 R25 〇〇3 1.487490 70.2 Glass cover CG R26 〇〇 1. 59989 (W)~7. 281418(M)~12. 668896(T) In the thickness T of Table 3, (W) refers to the zoom projection lens 2 on the optical axis Z in the wide-angle state. (M) refers to the distance between the zoom projection lens 2 on the optical axis Z in the middle state; (7) refers to the zoom projection lens 2 in the telephoto state, on the optical axis z The distance between the tops. Further, the surface depression degree D of the aspherical surface of the twelfth lens unit 2 of the present embodiment is obtained by the following formula: Z) =

CH ^^^K).c2 .ΗΎ + Ε4·Η +E6'H6 +Es'Hi +Ειο·Η'° +Ε12·Η'2 +eu.H1 where: D: the aspheric surface of the depression; C : reciprocal of radius of curvature; Η: aperture radius of the surface; Κ: conic coefficient; 13 201219877 E4~Eh: various order coefficients of the aperture radius H of the surface. In the present embodiment, the coefficients of the conic coefficient κ (conic constant) and the surface aperture radius η of each aspherical surface are shown in Table 4: Table 4 Surface K E4 E6 E8 E10 E12 E14 R23 7. 775393 -6.942e-05 -3. 025e-07 -2.059e-09 1.125e-ll -2.813e-13 〇R24 0.3816114 5.208e-06 -1. 799e-〇7 2.479e-09 -3.482e-ll 1.723e By the arrangement of the lens and the aperture described above, the zoom projection lens 2 of the present embodiment can effectively reduce the volume to meet the demand for light weight, and the zoom projection lens 2 is in the Wide-angie state. The imaging quality can also be achieved, as can be seen from Figures 6A to 6D. FIG. 6A is a longitudinal chromatic aberration diagram of the zoom projection lens 2 of the present embodiment; FIG. 6B is a lateral chromatic aberration diagram of the zoom projection lens 2 of the present embodiment; FIG. 6: The field curvature map and the distortion map of the zoom projection lens 2 of the embodiment; FIG. 6D shows the spatial frequency modulation transfer function diagram (Spatial Frequency MTF) of the zoom projection lens 2 of the present embodiment. From FIG. 6 a and FIG. 6 B can be seen that the longitudinal chromatic aberration of the zoom projection lens 2 of the present embodiment does not exceed 〇〇8 mm and _〇〇4 mm at the maximum, and the lateral chromatic aberration does not exceed 哗 and ....!!! As can be seen from Fig. 6C, The maximum field curvature of the zoom lens 2 of the embodiment is not more than 〇i6mm and -〇.〇4mm, and the distortion variable does not exceed 2%. As can be seen from Fig. 6D, the zoom projection lens 2 of the embodiment is at 6〇lp At /mm, the value of the modulation optical transfer function is maintained above 4%. In addition, when the zoom projection lens 2 is in the middle state, its imaging 201219877 can also meet the quality requirements, which can be seen from Figure 7A. As can be seen from Fig. 7A and Fig. 7B, the longitudinal chromatic aberration of the present tilting lens 2 is the most It is not more than 0.08mm and -〇.〇3mm, and the lateral chromatic aberration is not more than 4μιη *_1μηη. It can be seen from Fig. 7C that the maximum field curvature of the zoom projection lens 2 of the present embodiment does not exceed 0.12mm and -0.04mm' and is distorted. The amount does not exceed 16%. As can be seen from Fig. 7〇, the zoom optical projection function of the zoom projection lens 2 of this embodiment is maintained at 50% or more at 60 lp/mm. Furthermore, the zoom projection lens 2 In the telephoto state, the imaging quality can also meet the requirements, which can be seen from Fig. 8A to Fig. 8D. As can be seen from Fig. 8A and Fig. 8B, the longitudinal chromatic aberration of the zoom projection lens 2 of this embodiment can be seen. The maximum field curvature of the zoom projection lens 2 of the present embodiment does not exceed 0.16 mm and -0.12 mm, and the maximum lateral curvature of the zoom projection lens 2 of the present embodiment is not more than 0.12 mm and -〇.〇5 mm, and the lateral chromatic aberration is not more than 5 μm and -3 μm. And the distortion variable does not exceed 〇·4%. As can be seen from Fig. 8D, when the zoom projection lens 2 of the embodiment is 6 〇 ip/mm, the modulation optical transfer function value is maintained at 40% or more. The resolution of the zoom projection lens 2 of the present embodiment is in a wide-angle state, In the middle state or the long-range projection (teieph0t0) state, it is in accordance with the standard. Please refer to FIG. 9 , which is a lens configuration diagram of the zoom projection lens 3 according to the third preferred embodiment of the present invention, which includes an optical axis along the optical axis. Z and a first mirror group G1 and a second mirror group G2 are arranged in order from the imaging side to the image source side. The 15th 201219877 - mirror group G1 can be on the imaging side and the second mirror Between groups G2, moving along the light sleeve z '(10) variable lens focal length' allows the zoom projection lens 3 to be classified into a wide-angle state, an intermediate_(four) state, and a telephoto state according to the position of the first mirror group G1. Further, a glass cover CG (C0ver Glass) is provided between the second mirror group anode and the image source side. Wherein: the first mirror group G1 has a negative refractive power, and includes a first lens u, a second lens L2, a third lens L3, a fourth lens u, and a fifth lens L5. The first lens L1 is a crescent lens having a negative refractive power, and the convex surface R1 faces the image forming side. The second lens L2 is a lenticular lens having a positive refractive power. The second lens L3 is a crescent lens having a negative refractive power, and its convex surface R5 faces the image forming side. The fourth lens L4 is a biconcave lens having a negative refractive power. The fifth lens L5 is a crescent lens having a positive refractive power, and its convex surface R9 faces the image forming side. The second mirror group G2 has a positive refractive power and includes a sixth lens L6, a seventh lens L7, a first lens # L8, a ninth lens L9, a tenth lens L10, a tenth lens U1, and - Twelfth lens (1). The sixth lens L6 is a lenticular lens having positive refractive power. The red lens u is a crescent lens having a positive refractive power and its convex surface R13 faces the image forming side. The eighth mirror is a crescent lens having a negative refractive power, and its convex surface R15 faces the imaging side. The ninth lens L9 is a cemented lens having a negative refractive power, which is formed by gluing a lenticular lens L91 and a double concave lens L92, and the lenticular lens (9) is closer to the image side than the double concave lens L92. The tenth lens L10 is a lenticular lens having a refractive power of 201219877, and the aperture st of the zoom projection lens 3 is disposed on the surface R2G of the tenth lens L10. The tenth-lens Lu is a biconcave lens having a negative refractive power. The twelfth lens L12 is a single convex lens having a positive refractive power, and its convex surface R24 faces the image forming side and is an aspherical surface. In order to enable the zoom projection lens 3 to effectively reduce the total length of the lens, correct the aberration, and increase the back focus length, the zoom projection lens 3 satisfies the following conditions: (l) -0.87 <f2/fl <-0.76 (2) -2.09 < fl/fw < .1.85

(3) 1.59 <f2/fw< 1.64 (4) 0.70 < fw/bf < 0.71 (5) 6.66 < tt/fw < 6.7 (6) 4.7 < tt/bf < 4.74 (7)-1.31 < Ex/bf < -1.24 (8) 0.787 < lt/tt < 0.789 (9) 1.31 <fg/fw<2.2 where ' fl is the effective focal length of the first mirror group G1; f2 is the second mirror The effective focal length of the group G2; fW is the effective focal length of the zoom projection lens 3 in the wide-angle state; bf is the focal length of the zoom projection lens 3; the pillow is the total length of the zoom projection lens 3; ex is the zoom projection lens 3 The exit pupil position; It is the length between the first surface R1 of the zoom projection lens 3 and the last surface R27; fg is the effective focal length of the twelfth lens [12]. The focal length F (Focus Length), the numerical aperture FNO (F-number) of the zoom projection lens 3 of the third embodiment of the present invention, the radius of curvature R of the optical axis z of each lens surface, and the respective lenses are The thickness T on the optical axis z, the refractive index Nd (refractive index) of each lens 17 201219877 and the Abbe number Vd (Abbenumber) of each lens are shown in Table 5: Table V F = 21. 65 (W )~28. 07(M)~34. 083(T)_FN0=2. 398(W)~2. 75(M)~3. 085(T) Surface R(mm) T(mm) Nd Vd Remark R1 82.4291 2 1.846660 23.8 First lens LI R2 44.11047 6.216592 R3 82.28001 7. 565857 1.83481 42.7 Second lens L2 R4 -411.5318 0.2 R5 - one 72.60838 2 1.497 81.6 Third lens L3 R6 ^ 22. 34692 13.09526 R7 -71.09074 1.2 1.6779-1 55.3 Fourth lens L4 ”8 34. 69418 5. 324649 R9 — 41.52028 7 1.76182 26.5 Fifth lens L5 < R10 222.2834 29. 819856(W)~15.147117(M)~6.417403(T) R11 76. 38432 3.150969 1.72916 54.7 Sixth lens L6 R12 —-— 〇〇0.2 R13 35. 29524 3.118074 1.804 46.6 Seventh lens L7 R14 64.01 861 2.179643 R15 ----- 25. 0905 6.297454 1. 7552 27.5 Eighth lens L8 R16 15.97385 1.179039 R17 -___ 18.34847 7. 258963 1.497 81.6 Ninth lens L9 R18 -16.19557 1 1. 8044 39.6 R19 28.81485 1.885365 R20 36.49471 4.017563 1.83481 42.7 Tenth lens Ll (^ Aperture ST 4 R21 -23.95636 0.2 R22 -76. 69749 1.513695 1.6668 33.0 Eleventh lens L11 R23 26. 37816 0.977022 R24 38.36803 7 ---- 1-801910 40.89 Twelfth lens L12 R25 〇〇26 R26 oo 3.0 !· 487490 70.21 Glass cover CG R27 L~ _ oo 1. 599738(W)~7. 291842(M)~12. 6931KT) In the thickness T of Table 5, (w) means The zoom projection lens 3 is spaced apart from the optical axis Z in the wide-angle state; (Μ) refers to the zoom projection 18 201219877 when the lens 3 is in the middle state, the distance between the optical axes Z; (7) refers to the distance between the zoom projection lens 3 on the optical axis z in the telephoto state. Further, the surface depression degree D of the aspherical surface of the twelfth lens L12 of the present embodiment is obtained by the following formula: + Ε, +Εα -η* +Ε6·Η6 +£ι〇.ff'° +ει2 - η'2 CH2 l + yll-{l + k)-c2 · η: where ZD : the degree of depression of the aspheric surface; C : the reciprocal of the radius of curvature; Η : the aperture radius of the surface; Κ : the conic coefficient; Ε 4~ Εΐ4: The order factor of the aperture radius Η of the surface. In the present embodiment, the conical coefficients κ (c〇nic constant) of each aspherical surface and the respective order coefficients E4 to Ei4 of the surface aperture radius 如 are as shown in Table 6: Table 6 Surface Κ Λ " - Ε4 E6 E8 E10 E12 E14 R24 -1.288715 -8. 357e-06 7. 205e-08 -2.594e-〇9 3.614e-ll -1.926e-13 0~~~~~ By the configuration of the above lens and aperture, the embodiment is The zoom projection lens 3 can not only effectively reduce the volume to meet the demand for light weight, and the zoom projection lens 3 can also meet the requirements in image quality in the wide-angle state, which can be seen from FIG. 10A to FIG. Fig. 1A shows the longitudinal chromatic aberration diagram of the zoom projection lens 3 of the embodiment of the present embodiment. The visual chromatic aberration diagram of the zoom projection lens 3 of the present embodiment is shown in Fig. 1QC. The field curvature map and the distortion map of the zoom projection lens 3 of the present embodiment; the spatial frequency modulation transfer function map (Spatial Frequency MTF) of the zoom projection lens 3 of the present embodiment shown in FIG. As can be seen from Fig. 1B, in this embodiment, the axis of the new image is turned over and the difference is the most And 0.04mm & color difference is not more than the maximum. As can be seen from Figure i〇c, the maximum field curvature of the zoom projection lens 3 of this embodiment does not exceed (4) and -0.08mm ' and the distortion variable does not exceed 2%. It can be seen that the zoom projection steel 3 of this embodiment has an optical transmission function value of 40% or more on the axis of 60 lp/mm. In addition, the change is made; #, the projection lens 3 is in the middle of the towel. In the state, the imaging quality can also meet the requirements, which can be seen from Fig. UA to Fig. 11D. As can be seen from Fig. 11B and Fig. 11B, the longitudinal chromatic aberration of the zoom projection lens 3 of the present embodiment does not exceed _mm and The maximum lateral chromatic aberration does not exceed - and plus. As can be seen from Fig. 11C, the maximum field curvature of the zoom projection lens 3 of the present embodiment does not exceed 0.10 mm and -0.08 mm, and the distortion variable does not exceed 12%. It can be seen that the value of the modulation optical transfer function of the zoom projection lens 3 of this embodiment is maintained at 50% or more at 60 Ip/mm. Furthermore, the change head 3 is in the _«彡__ hybrid state. f imaging quality can also meet the requirements, which can be seen from the figure to Figure (10). As can be seen from Figure 1M and Figure 2B, the zoom projection of this embodiment The longitudinal direction of the lens 3 201220127 The maximum color difference does not exceed 〇.〇7mm and -〇.〇6mm, the lateral chromatic aberration does not exceed 2μπι and -2μιη maximum. As can be seen from Fig. 12C, the maximum field curvature of the zoom projection lens 3 of this embodiment is not More than 0.04mm and the distortion does not exceed 〇.4%. As can be seen from the figure UD, when the zoom projection lens 3 of the present embodiment is at 60 lp/mm, the value of the modulated optical ship function is still transferred to 4%. Thereby, it is apparent that the resolution of the zoom projection lens 3 of the present embodiment is standard regardless of whether it is in a wide-angle state, a middle state, or a long-range projection (teleph〇t〇) state. 13 is a lens configuration diagram of a zoom projection lens 4 according to a fourth preferred embodiment of the present invention, which includes a glass made of glass and arranged along the optical axis z and sequentially arranged from the imaging side to the image source side. A mirror group G1 and a second mirror group G2. The first mirror group G1 can be moved along the optical axis Z between the imaging side and the second mirror group G2 to change the focal length of the lens. The zoom projection lens 4 can be divided into wide angles according to the position of the first mirror group G1. (Wide_angle) state, middle state, and telephoto state. Further, a glass cover CG (cover glass) is provided between the second mirror group G2 and the image source side. Wherein: the first mirror group G1 has a negative refractive power, and includes a first lens, a second lens L2, a third lens [3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. . The first lens L1 is a crescent lens having a negative refractive power, and its convex surface R1 faces the image forming side. The second lens L2 is a lenticular lens having a positive refractive power. The third lens L3 is a negative refractive power 21 201219877 and has a negative orientation toward the imaging side. The fourth lens L4 is a := lens. The fifth _ is a positive lens with a double lens. The sixth lens L6 is a crescent mirror having a negative developing power, and its concave surface R11 faces the image forming side. The second mirror group G2 has a positive refractive power and includes a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens ug, an eleventh lens L11, and a twelfth lens U2. . The seventh lens L7 is a lenticular lens having a positive refractive power. The eighth lens L8 is a biconcave lens having a refractive power of 贞. The ninth lens L9 is a single convex lens having a positive refractive power, and its convex surface R17 faces the image forming side. The tenth lens L10 is a crescent lens having a positive refractive power and its convex surface R20 faces the image forming side. The eleventh lens Ui is a biconcave lens having a negative refractive power. The twelfth lens L12 is a lenticular lens having a positive refractive power, and the surfaces R24 and R25 are aspherical surfaces. Further, the aperture ST of the zoom projection lens 4 is disposed between the ninth lens L9 and the tenth lens L10. In order to enable the zoom projection lens 4 to effectively reduce the total length of the lens, correct the aberration, and increase the back focus length, the zoom projection lens 4 satisfies the following conditions: (1) -0.87 < f2/fl < -0.76 (2) -2.09 < fl/fw < -1.85 (3)1.59<f2/fw<1.64 (5) 6.66 < tt/fw < 6.7 (7) -1.31 <ex/bf<-i.24 ( 9) 1.31 <fg/fw<2.2 (4) 0.70 <fw/bf<0.71 (6)4.7<tt/bf<4.74 (8) 0.787 < lt/tt < 0.789 22 201219877 where fl is The effective focal length of the first mirror group G1; £2 is the effective focal length of the second mirror group G2; fW is the effective focal length of the plane, the projection _4 in the wide_angie state; bf is the zoom projection lens 4 After the focal length; bamboo is the total length of the zoom projection lens 4; ex is the exit position of the zoom projection lens 4 (exitpupilpositi〇n); it is the first surface R1 to the last surface of the zoom projection lens 4 The length; fg is the effective focal length of the twelfth lens m. The focal length F (F〇cus Length), the numerical aperture FNO (F-number) of the zoom projection lens 4 of the fourth embodiment of the present invention, and the radius of curvature R of the optical axis z of each lens surface, The thickness T of the lens on the optical axis z, the refractive index Nd of each lens (here plus Μεχ) and the Abbe number Vd (Abbenumber) of each lens are shown in Table 7: Table 7 F = 21.65 (W )~28 0698(M)~34.0989(T) FNO=1.997(W)~2.2507CM)~2.4928m Surface R(mm) l(min) Nd Vd Remarks R1 70.37629 0.8 1.836312 24. 3768 First lens LI R2 43.79806 6. 930353 R3 88.89598 7.111371 1.834807 42. 7237 Second lens L2 R4 -550.4502 0.1 R5 81. 96677 1.46034 1.727362 54.7956 Third lens L3 R6 26. 52786 12.97328 R7 -75.75273 0.8 1.730645 53.8585 Fourth lens L4 R8 46.84376 3.196082 R9 — - 49.21537 8. 954779 1.84297 27. 5644 Fifth lens L5 R10 -84.9628 4.769462 23 201219877 R11 -51.17976 0.8 1. 709783 27.8892 Sixth lens L6 R12 -189.9925 28.111294(W)~11. 901811(M)~2. 236538(T ) R13 39.02144 5.426094 1.735485 53.6775 Seven lenses L7 R14 -1158.693 5.793676 R15 -60.49845 0.9488204 1.59296 35. 2751 Eighth lens L8 R16 36.22194 0.8 R17 20.31188 6.777882 1.514567 77.5129 Ninth lens L9 R18 799. 3534 4.444998 R19 〇〇0.1 Aperture ST R20 22.85002 5. 504274 1.758507 50.3822 Ten lens L10 R21 39. 64877 2. 795098 ( R22 -61.06559 0.8 1.686187 28.947 Eleventh lens L11 R23 30.56569 0.4025781 R24 29.45151 4.599618 1.834381 42. 7567 Twelfth lens L12 R25 -184.1319 26 R26 〇〇3 1.487490 70.2 Glass overlay CG R27 〇〇1. 6(ff)~6. 773346(M)~11. 691575(T) The thickness T of Table 7 '(W) means that the zoom projection lens 4 is in the wide-angle state. (M) refers to the distance between the zoom projection lens 4 in the middle state on the optical axis Z; (T) refers to the zoom projection lens 4 in the long-distance projection ( In the state of telephoto), the distance between the optical axes z. Further, the surface depression degree D of the aspherical surfaces R24, R25 of the twelfth lens L12 of the present embodiment is obtained by the following formula: 24 201219877 wherein: D: the degree of depression of the aspherical surface; C: the reciprocal of the radius of curvature; : aperture radius of the surface; κ: conic coefficient; Ε4~Em: various order coefficients of the aperture radius Η of the surface. In the present embodiment, the conic coefficients K and the surface aperture radius 各个 of the respective aspherical surfaces are as shown in Table 8: Table 8 Surface K E4 E6 E8 E10 E12 E14 R24 2. 296673 - 3.835e-05 -1.764e-07 -5.592el〇-3.214e-12 -6.871e-14 0 — R25 55.50933 1·525e-05 -2. 232e-07 2. 275e-09 '3.343e-ll 9. 828e-14 0 The lens projection lens 4 of the present embodiment can effectively reduce the volume to meet the requirement of light weight by the configuration of the lens and the aperture described above. The zoom projection lens 4 is imaged in the Wide_angle state. The quality can also meet the requirements'. This can be seen from Figure 14A to Figure 14D. 14A is a longitudinal chromatic aberration diagram of the zoom projection lens 4 of the present embodiment; FIG. 14B is a lateral chromatic aberration diagram of the zoom technical lens 4 of the present embodiment; and FIG. 14C is the embodiment. The field curvature map and the distortion map of the zoom projection lens 4 of the example; FIG. 14D shows the spatial frequency modulation transfer function map (Spatial Frequency MTF) of the zoom projection lens 4 of the present embodiment. As can be seen from Figs. 14A and 14B, the longitudinal chromatic aberration of the zoom projection lens 4 of the present embodiment does not exceed 〇〇8 mm and 25 201219877, and the lateral chromatic aberration does not exceed 仏m sum. As can be seen from the graph MC, the maximum field curvature of the zoom projection lens 4 of the present embodiment does not exceed 〇1〇面面面, and the domain variable does not exceed 1.2%. As can be seen from the graph HD, the zoom projection Q6 of the present embodiment (the daily push of Mp/mm, the value of the _forest transfer function is still maintained at 50% or more. In addition, when the zoom projection lens 4 is in the middle state, The imaging quality can also meet the requirements, which can be seen from Figure 15A to Figure 15D.

And FIG. 15B, it can be seen that the longitudinal chromatic aberration of the zoom projection 4 of the present embodiment does not exceed 0.07 mm and -〇.〇6 mm at the maximum, and the lateral chromatic aberration does not exceed 2 and _2 /zm. For example, the maximum field curvature of the zoom projection lens & does not exceed 0.04mm and -O.iemm, and the distortion variable does not exceed 〇4%. It is seen from Fig. 15D that the modulation optical transfer function value of the zoom projection lens 4 of the present embodiment is maintained at 40% or more at 60 lp/mm. Furthermore, the zoom projection lens 4 can also meet the imaging quality in the long-range projection (teieph〇t〇) state, which can be seen from FIG. 16A to FIG. 16D. As can be seen from Fig. 16A and Fig. 6, the longitudinal chromatic aberration of the zoom projection lens 4 of the present embodiment does not exceed 〇.〇8 mm and _〇 〇3 mm at the maximum, and the lateral chromatic aberration does not exceed 4 //m and _2//m at the maximum. As can be seen from Fig. 16c, the maximum field curvature of the zoom projection lens 4 of the present embodiment does not exceed O.Wmm and -〇.〇8 mm, and the distortion does not exceed 2°/. . As can be seen from Fig. 16D, when the zoom projection lens 4 of the present embodiment is at 6 〇 lp/mm, the modulation optical transfer function value is maintained at 40% or more. Thereby, it is apparent that the resolution of the zoom projection lens 4 of the present embodiment conforms to the standard regardless of whether it is a wide-angle 26 201219877 state, a middle state, or a long-distance projection (10) eph〇t〇 state. In summary, it can be seen that the zoom projection lens of the present invention can achieve the purpose of zooming only by using two sets of mirrors' and is not only small in size but also high in optical efficiency. The above description is only for the preferred embodiment of the present invention, and the equivalent structure and manufacturing method of the present invention are intended to be included in the scope of the present invention. Bu

27 201219877 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a lens configuration diagram of a first preferred embodiment of the present invention. Fig. 2A is a longitudinal chromatic aberration diagram of the first preferred embodiment in a wide-angle state. Fig. 2B is a lateral chromatic aberration diagram of the first preferred embodiment in the wide margin state. Fig. 2C is a field curvature diagram and a saturation diagram of the first preferred embodiment in a wide-angle state. Figure 2D is a biliary diagram of the first preferred embodiment in the broad sense. Fig. 3A is a longitudinal chromatic aberration diagram of the first preferred embodiment in an intermediate state. Fig. 3B is a lateral chromatic aberration diagram of the first preferred embodiment in the intermediate state. Fig. 3C is a field curvature diagram and a distortion diagram of the first preferred embodiment in an intermediate state. Figure 3D is an illustration of the first preferred embodiment in an intermediate ride. Figure 4A is a longitudinal chromatic aberration diagram of the first preferred embodiment in the telephoto state. Fig. 4B is a lateral chromatic aberration diagram of the first preferred embodiment in the far weave state. FIG. 4C is a field curvature diagram and a distortion diagram of the first preferred embodiment in a remote projection state. FIG. 4D is an MTF diagram of the first best _ 丨 in the long-distance riding. Fig. 5 is a view showing the mirror of the second preferred embodiment. Fig. 6A is a longitudinal chromatic aberration diagram of the second preferred embodiment in a wide-angle state. FIG. 6B is a lateral chromatic aberration diagram of the second preferred real-off state in the wide-axis state. Fig. 6C is a field curvature diagram and a distortion diagram of the second preferred embodiment in a wide-angle state. Figure 6D is a mtf diagram of the second preferred embodiment in a wide-angle state. Fig. 7A is a longitudinal chromatic aberration diagram of the second preferred embodiment in an intermediate state. Fig. 7B is a lateral chromatic aberration diagram of the second preferred embodiment in an intermediate state. Fig. 7C is a field curvature diagram and a distortion diagram of the second preferred embodiment in an intermediate state. 28 201219877 Figure 7D is an illustration of the mTF of the first preferred embodiment in the state of the towel. The longitudinal chromatic aberration diagram of the preferred embodiment in the telephoto state. ® 8B is the second best practice for the lateral chromatic aberration diagram of the long-range doping. FIG. 8C is a field curvature diagram and a sagittal diagram of the second preferred embodiment in a telephoto state. Figure 8 is a diagram showing the MTF of the first preferred embodiment in the telephoto state. Figure 9 is a perspective view of a lens arrangement in accordance with a third preferred embodiment of the present invention. Fig. 10A is a longitudinal chromatic aberration diagram of the second preferred embodiment in a wide-angle state. The ffi 10B is a lateral chromatic aberration diagram of the second preferred embodiment in the wide-angle state. Fig. 10C is a field curvature diagram and a saturation diagram of the second preferred embodiment in a wide-angle state. Fig. 10D is a front view of the second preferred embodiment in the wide-angle state. Figure 11 is a longitudinal chromatic aberration diagram of the second preferred embodiment in an intermediate state. Figure 11 is a lateral chromatic aberration diagram of the third preferred embodiment in an intermediate state. Figure 11C is a field curvature diagram and a distortion diagram of the second preferred embodiment in an intermediate state. Figure 11D is an MTF diagram of the third preferred embodiment in an intermediate state. Lumen 12Α is a longitudinal chromatic aberration diagram of the second preferred embodiment in the telephoto state. Figure 12 is a lateral chromatic aberration diagram of the second preferred embodiment in the telephoto state. Fig. 12C is a field curvature diagram and a distortion diagram of the second preferred embodiment in a telephoto state. Figure 12D is an MTF diagram of the second preferred embodiment in a telephoto state. Figure 13 is a perspective view of a lens configuration according to a fourth preferred embodiment of the present invention. Figure 14 is a longitudinal chromatic aberration diagram of the fourth preferred embodiment in a wide-angle state. Figure MB is a lateral chromatic aberration diagram of the fourth preferred embodiment in the wide-angle state. Fig. 14c is a field curvature diagram and a distortion diagram of the fourth preferred embodiment in a wide-angle state. 29 201219877 FIG. 14D is an MTF diagram of the fourth preferred embodiment in a wide-angle state. Fig. 15A is a longitudinal chromatic aberration diagram of the fourth preferred embodiment in an intermediate state. Figure 15B is a lateral chromatic aberration diagram of the fourth preferred embodiment in an intermediate state. Fig. 15C is a view showing the field dependence and the saturation of the fourth preferred embodiment in the cut state. Figure UD is a calendar diagram of the fourth preferred embodiment in an intermediate state. The figure is the longitudinal chromatic aberration diagram of the fourth healthy reward in the distant position. Figure 4 is a lateral chromatic aberration diagram of the fourth preferred embodiment in the telephoto state. Fig. 16C is a field curvature diagram and a saturation diagram of the fourth preferred embodiment in the telephoto state. The figure is a winning diagram of the fourth preferred embodiment in the telephoto state. 201219877 [Description of main component symbols] 1 zoom projection lens G1 first mirror group L1 first lens L2 second lens L3 third lens L4 fourth lens L5 fifth lens G2 second mirror group L6 sixth lens L7 seventh lens L8 Eighth lens L9 Nine lens L10 Tenth lens L11 Eleventh lens CG glass cover ST aperture R1 R24 surface Z-axis 2 Zoom projection lens G1 First mirror group L1 First lens L2 Second lens L3 Third lens L4 Fourth lens L5 fifth lens second mirror group L6 sixth lens L7 seventh lens L8 eighth lens L9 ninth lens L10 tenth lens L11 eleventh lens L12 twelfth lens CG glass cover ST aperture R1 ~ R26 surface Z optical axis 31 201219877 3 zoom projection lens G1 first mirror group L1 first lens L4 fourth lens second mirror group L6 sixth lens L9 ninth lens L10 tenth lens CG glass cover Z optical axis 4 zoom projection lens G1 One mirror group L1 first lens L4 fourth lens second mirror group L7 seventh lens L10 tenth lens CG glass cover Z optical axis L2 second lens L5 fifth lens L7 seventh lens L91 lenticular lens L11 eleventh lens ST Aperture L2 second Lens L5 fifth lens L8 eighth lens L11 eleventh lens ST aperture L3 third lens L8 eighth lens L92 biconcave lens L12 twelfth lens R1 ~ R27 surface L3 third lens L6 sixth lens L9 ninth lens L12 Twelve lenses R1 to R27 surface

32

Claims (1)

201219877 VII. Patent application scope: 1. A zoom lens projection lens comprising a first-mirror group and a second mirror group arranged along an optical axis and arranged from an imaging side to an image source side; The first group has a negative refractive power; the refractive power of the three lenses in the first mirror group from the imaging side to the image source side is negative, positive, and negative sequentially; the second mirror group has positive refractive power. 'In the second mirror group, the image is like the last image - the last lens has a positive refractive power, and at least one side is an aspherical surface; in addition, the first mirror group can be on the imaging side and the second mirror The group moves along the optical axis. 2. The zoom projection lens as described in claim i further comprises an aperture disposed in the second mirror group. The variable lens of claim 1, wherein the first lens group comprises a first lens, a second lens, and a third arranged in sequence from the imaging side to the image source side. The lens, the fourth lens and the fifth lens; all of the lenses are made of glass, and their refractive powers are negative, positive, negative, negative, and positive. The zoom projection lens of claim 1, wherein the second lens group is a glass mirror having a positive refractive power from the imaging side to the image source side, as claimed in claim 1. The Wei projection lens satisfies the following conditions: -0.87 <£2/ί!<·〇.76, where is the effective focal length of the first mirror group; β is the effective focal length of the first mirror group. 6 The zoom projection lens of claim 1 further satisfies the following conditions: • 2.09 <fl/fW<-1.85 'where fi is the effective focal length of the first mirror group; added as the 33 201219877 zoom projection lens The effective focal length in the wide-angle state. 7. The zoom projection lens according to claim 1 further satisfies the following conditions: 1·59<ί2/ί\ν<1·64 'where β is the effective focal length of the second mirror group; for the zoom projection lens The effective focal length in the wide_angle state. 8. The zoom projection lens according to claim 1 further satisfies the following conditions: 0/70<fW/bf<0,71 'where, the effective focal length of the zoom projection lens in the wide_angle state is added; bf The focal length of the projection lens for this zoom. 9. The zoom projection lens of claim 1 further satisfies the following conditions: 6'66<tt/fw<6·7 'where fW is the effective focal length of the zoom projection lens in the Wide-angle state ;tt is the total length of the zoom projection lens. 10. The zoom projection lens according to claim 1 further satisfies the following conditions: 4·7<Μ)ί*<4·74, wherein bf is the focal length of the zoom projection lens; 廿 is the zoom projection lens The total length. 11. The zoom projection lens of claim 1 further satisfies the following conditions: • Ul <ex/bf<_U4, wherein bf is the focal length of the zoom projection lens; and drinking is the exit position of the zoom projection lens ( Exit pupil p〇siti〇n). 12. The zoom projection lens of claim 1 further satisfies the following conditions: 0.787 <lt/tt<G.789 'where tt is the total length of the zoom projection lens; lt is the first of the zoom projections - The length from the surface to the last surface. 13. The zoom projection lens of claim 1 further satisfies the following condition: U1 <fg/fW<2.2, wherein 'additionally the zoom projection lens is effective in a wide-angle state; fg is the帛二镜群 & The secret source of the miscellaneous source counts 34 201219877 The effective focal length of the last lens. 35