TW201128251A - Lens module - Google Patents

Abstract

A lens module including a first lens group, a second lens group, a third lens group, and an aperture stop is provided. The first lens group disposed between an enlarged side and a reduced side has a positive refractive power. The second lens group disposed between the first lens group and the reduced side has a negative refractive power. The third lens group disposed the second lens group and the reduced side has positive refractive power. The aperture stop is disposed between the first lens group and the second lens group. Additionally, the distance from a center of the second surface to a center of the third surface is L1, an effective focal length is f, and the lens module satisfies 0.4 < L1/ f < 1.2.

Description

201128251 r i i j3569twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a lens, and more particularly to a fixed focus lens module. [Prior Art] In recent years, 'digital display devices' such as liquid crystal displays (LCDs) and digital microdisplays (Digital Light)

Processing, DLP) and piasma display panels (PDPs) have gradually replaced traditional cathode ray tubes (CRTs) and are widely used in next-generation display devices. Since digital video signal transmission and processing are not distorted and clear, it is a trend to apply a digital display device to a projection display device (for example, a digital rear projection display device). However, lens modules used in projection display devices present many challenges for optical designers. For example, in general projection display devices, lens modules typically have low distortion aberrations, high resolution, high contrast, and uniform illuminance in order to achieve good imaging quality. In addition, in addition to good image quality, these high-quality projection display devices preferably have a larger field of view to meet the needs of a large space to project large images. In addition, in order to improve the utilization of the light source and the uniformity of the illumination of the projection surface, the principal ray on the reduction side of the lens module and the optical axis thereof are closer to each other, that is, the principal ray on the reduction side is opposite to the optical axis. The telecentric angle should be as small as possible. 201128251 1 j. 1 33569twf.doc/n Taiwan Patent No. M362997 discloses an optical mold cylinder comprising a front lens group and a rear lens group. The front lens group includes a first lens, a first lens, and a third lens. The first lens has a biconcave shape. The second lens has a translucency and the lens side of the image side is convex. The third lens has a positive surface and the lens surface on the object side is convex. The rear lens group is provided with a 〃 镜 mirror and a fifth lens in this order from the object side. The fourth lens has a negative refracting power and the image side transparent Z is a concave surface. The fifth lens has a biconvex shape, and the advantages and meeting advantages of the optical module are high. U.S. Patent No. 6,674,816 to U.S. Patent No. 6,674,816 discloses a four-piece wide-angle lens. The diopter of the four lenses is negative and positive from the object side to the image side, wherein the first lens faces the object side. For a concave surface, at least the middle surface of the second sheet, the positive portion is aspherical, and the fourth lens faces the image 2 surface, and at least the inner surface of the fourth lens is aspherical. In addition, ',, 'II = Patent No. 49938M, Figures 8 and 9 disclose a two-group; ^ focal lens, including the first - Wei group (with - (four) luminosity mirror large ^ = group (respectively by diopter The positive, negative, and positive lens groups are located between the first lens group and the second lens group. The US Patent No. 5233474, which discloses a five-piece zoom lens, includes a first lens group. Between the third lens and the fourth lens of the second lens group, the amplifying side is an aspherical surface. In addition, the U.S. Patent No. 5796528 #u is further disclosed in FIG. 'It includes the first lens group and the second lens group. The second lens lens group between the money group. The same marriage specializes in the lake 8 8 201128251 hi -^3569twf.doc/n and 4679913 also reveals - two In addition, in the U.S. Patent Publication No. __ towel _ _ type W type fixed focus lens. [Invention] The present invention provides a lens module, which has the advantages of small size and better quality. The present invention is further understood in the technical features disclosed in the present invention. In order to achieve the above-mentioned or some or all of the objectives or other purposes, the present embodiment provides a lens module including a - lens group, a lens group, a third lens group, and a hole lens. Between the magnification side and the reduction side of a lens group, there is a positive refracting power. The first permeable lens includes a sub-lens group anti-group which is sequentially arranged from the magnification side to the reduction side. The first sub-lens group and the second sub-lens The group has a first yaw and a positive refracting power, wherein the first sub-lens group has a first surface of the first through-lens facing the magnifying side - the first surface is a concave surface. The first mirror group has a - "lens". The second lens group is disposed between the first lenses and has a negative refracting power. The second lens group includes a third lens and a four-lens lens arranged from the amplification order, wherein the first mirror has positive diopter and negative refracting power, respectively. Taking: the lens surface on the near reduction side is a second surface. The third lens has a positive refractive power between the lens group and the reduction side. The third lens group includes a fifth lens. The third lens group is closest to the magnification side.透透201128251 ηι 咖33569t Wf:d0c/n The surface of the mirror is a second main τ, and the volume is also the surface. The aperture stop is arranged in the second sub-lens group and the first mirror group. The core is effective to the _ lens module. The focal length is f, the center distance of the surface of τ /·ρ - the surface of the second surface is k, and the lens module can conform to 0.4 &lt; In the embodiment of the invention, the second surface is a concave surface. In the embodiment, the first lens, the second lens, and the third lens are at least the aspherical lens of the lens and the fifth lens, and the first lens of the mosquito lens is substantially closed. The side of the table is 匁 匁 = rate is half of the ruler 1, the curvature of the surface of the fourth lens toward the reduction side - and the lens module can conform to 7.7 &lt;(丨Rl丨+R2)/(丨Rl丨在本In an embodiment of the invention, the Abbe number of the third lens is Up,

The Abbe number of the four lenses is h, and the lens module can conform to 2Q &lt;3〇. 々h ^ In an embodiment of the present invention, the effective focal length of the lens module is f, the effective focal length of the first sub-lens group is fSG1, and the effective focal length of the second sub-lens group 'fSG2' and the lens module can conform to 〇.5&lt; | fSG]丨/f&lt;4l and 〇3 two fsG2/ f&lt;0.95. In an embodiment of the present invention, the focal length of the lens module is f, the effective focal length of the third lens is f3, the effective focal length of the fourth lens is f4, and the lens module can conform to 5.5&lt;f3/ f&lt;2 and 〇.35&lt; | ^, 丨/^<^. In an embodiment of the present invention, the lens module has a focal length of f, the effective focal length of the third lens group is fa, and the lens module can be: 〇8, <201128251 3J569twf.doc/n in the present invention. In one embodiment, the first lens has a negative refracting power and the first lens has a positive refracting power. In an embodiment of the invention, the surface of the first lens group closest to the magnification side is a concave surface and the surface of the second lens group is a convex surface. - In an embodiment of the invention, the fifth lens has a positive refracting power and the surface of the fifth lens facing the magnification side is a convex surface. In an embodiment of the invention, the second sub-lens group further has a sixth lens disposed between the second lens and the aperture stop. In one embodiment of the invention, the first lens has a negative refracting power, the second lens has a positive refracting power, and the sixth lens has a positive refracting power. In an embodiment of the invention, the surface of the sixth lens facing the magnification side is a &amp; Further, the third lens is convex toward the surface of the spoon, and the surface of the fourth lens facing the reduction side is concave. In an embodiment of the invention, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspherical lens. In an embodiment of the invention, the first lens group and the second lens group are in a focus group, and the third lens group is a fixed group. The embodiment of the present invention has at least one of the following advantages. The mirror group of the embodiment of the present invention can adopt a negative refracting power of the first sub-lens group closest to the grading, and the lens closest to the magnifying side faces the magnifying side. The surface is concave, which can increase the angle of view of the lens module, and can also correct the distortion difference generated by the second lens group to make the lens module have better optical 2^2, and the lens module can be used by the first A lens group and a second lens group move relative to the third lens group to focus, and the third lens group shrinks the lens module 201128251 ^ rij -5:&gt;569twf.doc/n main light and optical axis near the small side Close to parallel. Therefore, the lens module can effectively eliminate at least one of aberration, chromatic aberration, distortion, image quality, and shrinkage. The above features and advantages of the present invention will become more apparent and understood from the appended claims. [Embodiment] The foregoing and other technical contents, features, and the following description of the present invention will be described in conjunction with the detailed description of the present invention. The directional terms mentioned in the following embodiments, for example: upper Z 2 :, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the direction test used is to illustrate that the present invention is not limited by wire.

1 is a lens module according to an embodiment of the present invention. The lens module of the embodiment is disposed in two and includes a second one from the enlarged side to the reduced side, and the aperture is 120. The second lens group 130 and an ith are in the present embodiment, and the diopter of the 'the first lens group 11G, the second lens group 130, and the second lens group 14A are respectively positively arranged. The group 11G includes the side from the magnification side to the reduction side. The first-sub-lens group and the second/, diopter are, for example, negative and positive. The fourth brother group b, the two lens cores and the second lens 112 has a - concave surface. The second sub-lens group 110b has a second read #, and the surface S1 is a mirror group 130 including a scaled-down state, and the second lens 丨34, the diopter of which is The order is, for example, positive or negative. Here, the third lens group 140 is composed of a fifth lens 142, and it is as positive as it is. Specifically, in the present embodiment, the first lens 112 is a convex-concave lens with a large orientation and a convex surface facing the reduction side, and has a negative refractive power. The surface 86 closest to the magnification side of the two first lens groups 130 is The convex surface, the second lens/32 is a convex lens having a convex surface facing the enlarged side, and the concave surface is facing the reduction side. The fourth lens 134 is a concave-convex lens whose concave surface faces the reduction side, the convex surface faces the magnification side, and the fifth lens 142 faces the magnification side. The surface of the surface is not limited thereto. In other embodiments, the lens may have a shape different from the above, depending on the actual situation. In this embodiment, in order to achieve the purpose of compactness and miniaturization of the lens module 100, at least one of the lenses constituting the lens module 100 may use an aspherical lens so that fewer lenses can be used (eg, Five pieces) and a kind of mirror f module with telecentric system and better imaging quality at the same time. In this case, in order to improve the uniformity of the light _ rate and the illuminance of the projected picture, the closer the main ray of the lens module 1 〇〇 to the side of the optical axis A is as close as possible, that is, it has a telecentric lens ( Optical properties of tdecentrie lens). Specifically, the lens module loo of the present embodiment is an aspherical lens in which the first lens 112 and the fourth lens 134 are each exemplified, but the present invention is not limited thereto. In another embodiment, the lens module may also employ other lenses as aspherical lenses. In addition, if the lens is designed with an aspherical surface, the material can be selected from the glass material ‘but the material of the plastic lens can be selected, so that the cost can be saved by 201128251 &gt;ί ΐδ^υ 33569twf.doc/n. In addition, the parameters and design of the aspherical mirror will be explained in the following paragraphs. In general, an image processing device 60 can be disposed on the reduction side. In the present embodiment, the image processing element 60 is, for example, a light valve, and the light valve is, for example, a digital micro-mirror device (DMD) or a liquid-crystal-on liquid crystal. -silicon pane LCOS panel) or a penetrating solution

Transmissive liquid crystal pand (transmissive LCD). Further, in the present embodiment, the lens module 1 is adapted to image the image provided by the image processing element 60 on the magnification side. In the present embodiment, since the first sub-lens group u〇a has a negative refracting power, in addition to the purpose of making the lens module 1 广 wide-angle, the distortion difference generated by the second lens group 120 can also be corrected. . In addition, when the surface S1 of the first lens U2 facing the magnification side is concave, the size of the lens can be reduced, in addition to increasing the field of view = the outer lens, so that the lens module 1 is also smashed. Helpful. In addition, since the surface of the second lens u 4 adjacent to the aperture stop 12 第二 in the second sub-lens group n 〇 b is convex, the second lens group 13 is adjacent to the aperture stop 120 The surface S6 of the third lens 132 facing the magnification side is also convex, so that the second three-lens 132 can be as close as possible so that the length L of the lens module is effectively shortened, and the lens module can be achieved. 〇〇〇〇

66 曰AA ~ J In addition, in this embodiment, in order to make the main beam of the lens module 1 in the vicinity parallel to the green A, it is similar to the lens 1, because 201128251 r 1 i〇j\j j3569twf. Doc/n This will give the flute = degree in the lens module 100. In addition, the mirror group (10) in the second lens group 13G is designed such that the positive refractive lens 134 faces the fourth side of the reduction side lens group 140, so that the scale + _ | of the fourth lens 134 is designed to be concave, thus The lens group 140 Γ can also make the pupil image of the second lens group 13 = = the size of the sizing and the better module 100 satisfy the following conditions. Under the premise of A (10), the lens Gans ^*4 &lt; Lj/ f &lt; 1.2 (condition -

To the surface SK) i lens illusion (9) effective focal length, and the surface S9 f &lt; μ, then the distance from the 'in the lens module, if W is small, so will (2) =;;: group two _ will be too The size of the lens 134 between the 130 and the third lens group 140 is increased, and the small lens: Π: Wf cannot be achieved. In the middle of the brother--the lens group 14〇 is close to the aberration caused by the lens. 1, the money is small, and the lack of repairing products: fine:: two! Can make the lens module 100 a better optical formation, so the mirror master module can also meet the following conditions according to the actual situation, where R&lt; is ί1 Ά )' (丨Rl hub) &lt; 4 (Condition 2) Rate Radius]'·, 'Table 4 of the four-lens 134 toward the magnification side* The song of S8&quot;2 is the surface S9 of the fourth lens 134 facing the reduction side 12 201128251 The radius of curvature of triiojv 33569twf.doc/n. If the lens module satisfies the condition two, it can have better performance in correcting off-axis aberrations, especially fidd curvature and coma. For example, in the lens module 1〇〇, if (丨

When Ri I +3⁄4 ) / ( | R! 丨 R2 ) &gt; 4, the surface S9 of the fourth lens 134 facing the reduction side generates a large aberration, and it is more difficult to correct the off-axis, difference, ' Especially the field curvature; if (I 丨 +1) / (丨I - R2) &lt; 0.7,

The negative diopter of the second lens group 130 of the second lens group 130 close to the third lens group 140 is weak, and is not sufficient to correct the aberration. In addition, if the lens module 1 is adjusted to correct the chromatic aberration force, the lens module 100 can satisfy the following condition three: swearing. r (condition three): _ is the t lens group 130, close to the aperture stop 120 ί; by number. For example, in the fourth lens of the ^^ group 140, the Abe represents the third through the second and the fourth. In the second, if the '&quot; "2", the Abbe number of the Xingdi four lens 134 is too embarrassing. Bath t, the lateral color difference of the positive lens module 1〇0; if ^1 S t &gt; the longitudinal color difference of the mirror master 100 will be more difficult. 17, in addition, the 'lens module _ can be the following four conditions: . and 03&lt;;Wf&lt; where f is the effective focal length of the lens module 10(), f (condition 4) - see the effective focal length of the group ll〇a, and f I sign _ SG1 is the first sub-transparent focal length. In detail, in Lens mode: 10" group 110b has one and then, the first, the mirror group:: the first: 丨子^ 13 201128251 ti ιο^υ j3569twf.doc/n the power is increased, although the lens module can be 1〇〇 The total length 1 is shortened to achieve a compact optical system, but its performance in coma and spherical aberration is increased; if I fsGi 丨 / f &gt; 4.1 and fSG2 / f &gt; 0.95 'the first sub-lens The power of the group 110a and the second sub-lens group 110b is reduced to make the aberration easy to be corrected, but the total length L of the lens module 1〇〇 is increased. Similarly, the 'lens module 1〇〇 can also satisfy the following condition five: 〇.5&lt;f3/f&lt;2 and 〇.35&lt; | f4 | /f&lt;〇9 (condition 5) where fs is the second lens group The effective focal length of the second lens 132 adjacent to the aperture stop 12〇 in 130, & is the effective focal length of the fourth lens 134 of the second lens group 13 靠近 adjacent to the second lens group 140, and is the entire lens module The effective focal length of 100. In detail, in the lens module 1 ,, if f3/f &lt; 0.5 and | &amp; | / f &lt; 〇.35, the power of the third lens 132 and the fourth lens 134 will increase, although The overall length L of the lens module 1 is shortened to achieve a compact optical system, but the field curvature and astigmatic aberration also become large, if 2 &lt; heart / f and 〇.9 <丨 &amp; 丨 / f Then, the power of the third lens 132 and the fourth lens 134 is reduced, so that the aberration is easily corrected, but the total length L of the entire lens module 100 is increased. Furthermore, in order to make the principal ray of the lens module 100 near the reduction side nearly parallel to the optical axis A, and to achieve the telecentric system, the third lens group 丨4〇 of the lens module 100 can be designed as positive diopter. The lens module 1 〇〇 can satisfy the following condition six: 0.8 &lt; f 〇 3 / f &lt; 2 (condition 6) where f is the effective focal length of the lens module 100, and fG3 is the effective focal length of the third lens group 140. For example, in the lens module 1 ,, if 14 201128251 mojv 33569twf.d 〇 c / n / f 'the refractive power of the third lens group 14G is near the reduction side of the chief ray of the helmet foot so that the lens mode The aforementioned purpose of group 100 is expected to cause the bet to be nearly parallel. To reach the fourth transmissive (four) 4 of the group 140, the 130 towel will be higher near the third lens, and the miniaturization cannot be achieved: the large production cost is the distance between the third lens group 140. Group 130 is set to 1 too small, and there is not enough space to store the components required for the shadow, such as reflective sheets. In the case of designing the lens, the condition of the lens module is not limited, but the condition of the optical imaging quality is selectively satisfied to meet the conditions listed above. However, an embodiment of the lens module 100 will be described below. It should be noted that the data sheets listed in Table 1 below are not intended to limit the invention, and the technical field of the art has a general knowledge after referring to the present invention. 'When the principles of the present invention can be applied to its parameters or settings Appropriate changes, which still fall within the scope of the present invention. Surface si radius of curvature (: -3.59882 pitch mm 1.946158 refractive index 1.631919 Abbe number. Remarks S2 4.83673 0.066615 23.41612 First lens

S3 60.59833 1.454517 S4 -13.0373 0.050013 1.834 37.16049 Second lens

15 201128251 r 丄j&gt;3569twf.doc/n S5 Infinity 0 \ Aperture stop S6 10.16985 1.342347 1.772499 49.59837 Third lens S7 163.0793 0.60942 \ \ S8 7.151089 0.850136 2.019603 21.45252 Fourth lens S9 3.495621 11.616 \ \ S10 10.65 3 1.620411 60.28958 Fifth lens S11 60 1.190511 \ \ S12 Infinite 0.65 1.508469 61.1878 Glass cover S13 Infinite 0.709 \ S14 Infinite \ \ In Table 1, 'pitch is the linear distance between two adjacent surfaces on the optical axis ,, for example Said, the distance between the surfaces S3, that is, the linear distance between the surface S3 and the surface § 4 on the optical axis A. For the thickness, refractive index and Abbe number of each lens in the remarks, refer to the values in the same column, the refractive index and the Abbe number. In addition, in Table 1, the surfaces S1 and S2 are the two surfaces of the first lens 112, the surface is illusory, S4 is the two surfaces of the second lens 114, the surface S5 is the aperture stop 12〇, and the surfaces S6 and S7 are the third lens. The two surfaces of 132, the surfaces S8, S9 are the two surfaces of the fourth lens 134, and the surfaces S10, S11 are the two surfaces of the fifth lens 142. The surfaces S12, S13 are - both surfaces of a cover giass 70 for the light valve 60. For the parameter values such as the radius of curvature and the spacing of each surface, please refer to Table 1 and will not be repeated here. 201128251 r i iojkj 33569twf.doc/n

2A to 2D are diagrams showing imaging optical simulation data of the lens module 100 of Fig. 1. 2A to 2D, wherein FIG. 2A is a modulation transfer function (MTF) whose horizontal axis is a spatial frequency in cycles per millimeter. The axis is the modulus of the OTF. In Figure 2A is a simulated data plot of light at three different wavelengths (460 nm, 527 nm, 615 nm, respectively). In addition, Fig. 2B and Fig. 2C are graphs of field curvature and distortion, respectively, and are simulated by light of three different wavelengths (460 nm, 527 nm, 615 nm, respectively). Figure 2D is a lateral color diagram and is a simulated data plot of three different wavelengths of light (460 nm, 527 nm, 615 nm, respectively). Since the patterns shown in Figs. 2A to 2D are all within the standard range, the lens module 100 of the present embodiment has good image quality. In addition, since the surfaces SI, S2, S8, and S9 are aspherical, the formula of the non-spherical surface is as follows:

10 Z(h)=—-. l + Vl-(l + k)(h/r)3 C,h12+C,h14+C,h16 + C2h2+C2h.4+C2h8 + C,h where Z It is the offset of the optical axis L direction. r is the radius of the osculating sphere, that is, half the curvature near the optical axis (as in the table, the radius of curvature of S1, S2, S8, S9 is the conic constant (c〇nie constant). 11 is the aspherical distance The vertical height of the optical axis, that is, the height from the center of the lens to the edge of the lens, can be known from the formula, the different h will correspond to different values of C. s. s. It is the aspheric coefficient. The aspherical coefficients and k values of the surface S, S2, S8, and S9 are as shown in Table 2: <Table 2> SI S2 S8 S9 K -1.2629 -4.34425 0 0.070606 C2 , 0 0 0 0 C4 1.2841E-03 -1.0204E-03 -1.9043E-03 -7.1111E-03 C6 5.2238E-05 1.9378E-04 7.5376E-05 5.0144E-04 C8 -4.9978E-06 -1.2096E-05 - 5.1103E-05 -2.8553E-04 C10 1.1414E-07 4.9715E-07 1.3235E-05 ------- 7.6527E-05 Cl2 2.5887E-09 -1.2050E-08 -1.5958E-06 -1.1521 E-05 Ci4 -1.1938E-10 1.2804E-10 9.4649E-08 8.8624H-07 Ci6 0 0 -2.2435E-09 -2.8534E-08 ---------- In addition, in Table 3 List some of the analog parameter values of the lens module 100, including valid The distance (EFL), the angle of view, the telecentric angle, and the analog value of the lens module 100 satisfying the condition 1 to condition 6. ~ '~~—--__{Table 2) Item ------- Numerical efficiency coke跖*————————·** 15 0831 - The angle of view is 37.2 degrees Far from 0 71 degrees L, /f —. - _ — —------ 0.77 2.918 --------- --- XX 1 ij^\/ 33569twf.doc/n &quot;&quot;——-- V Ρ — V Ν _____________ 28.15 ^Π _ 1 fsGl 1 / f_____ 3.769 fsG2〆ff) JW f3/f 0.921 __\U \ ii __ 0^5~^ f〇3 / f — 1.344 201128251 ” In the present embodiment, the first ι· in the first lens group ^ is a negative refracting power ′ so that the change of the second lens group 13 可 can be corrected. When the aberration is made and the lens 112 is the surface s surface toward the magnification side, the size of the first lens 112 can be reduced. In addition, if the surface S4 of the second shovel 114 toward the reduction side is a convex surface and the surface S6 of the third lens 132 facing the large side is also a convex surface, the size of the lens module can be reduced, and the size can be reduced. purpose. Further, the third lens group 14A has a positive refracting power, and the principal ray near the reduction side of the lens module 100 can be made nearly parallel to the optical axis A. Therefore, the lens module 1 has the advantages of less aberration of imaging and lower distortion. Furthermore, at least part of the lens of the lens module 1 can increase the quality by reducing the aberration by using an aspherical lens, and further reducing the number of lenses to further reduce the lens module 100. size of. In addition, the position of the third lens group 14A is fixed relative to the lens module 100, and can be focused by moving the first lens group u〇 and the second lens group 130 relative to the third lens group 140. FIG. 3 is another embodiment of the present invention. The structure of the lens module of an embodiment is shown in sound and diagram. Referring to FIG. 3, the lens module 300 of the present embodiment is similar to the lens $ group 1〇〇, but the most significant difference between the two is the 19 201128251 ^3569twf.d〇c/n group in the lens module 30〇 The third lens further includes a sixth lens 316 disposed between the second lens 314 and the aperture stop 320. In the present embodiment, the second lens and the sixth lens 316 are composed similarly to the aforementioned tool, and the group "speaks" has positive diopter in the second sub-lens group 314, and the sixth lens plus positive diopter, 2= The mirror 31 has a convex surface facing the reduction side, the concave surface faces the magnification side 1 = lens, and the # ship 316 is a lenticular lens. The convex mirror 312 in this embodiment has a concave surface facing the reduction side, and the convex surface faces the magnification side 3 concave lens. In the negative refracting power, the third lens 332 is a convex lens having a convex surface facing the 0 side, a concave surface facing the reduction side, and having a positive refractive power 2. The fourth lens 334 has a concave surface facing the reduction side and a convex surface facing the magnification side. a convex-concave lens having a negative refracting power, and the fifth lens 342 is a meniscus lens having a convex surface facing the reduction side 'concave surface toward the magnification side, and having a positive refracting power. /' Similarly, the lenticular lens in the lens module 300 312, the second lens 3 Η, the third lens 332, the fourth lens 334, the fifth lens 342, and the sixth riding 316 are at least - an aspherical design can be adopted, which can improve the overall imaging quality, and can also Reduce the scope of the mirror group 3 (10) In the present embodiment, the 'lens module 3' is a third lens 332 and the sixth lens 316 is an aspherical lens as an example, but is not limited thereto, and may be according to the needs of the user. And the design is slightly adjusted. But Yu Ming’s flaw, because the lens module 3〇〇 is similar to the lens module 1 (eight), the main difference is that the way of shunting the two sub-lens groups with positive diopter is different. Lai group 3(8)啰 has the advantages of mirror light group 1〇〇20 201128251 r 1 ιο^υ 33569twf.d〇c/n. In other words, if the mirror group 3GG meets the above conditions, its overall inch and its optical quality will be can

3, and the second embodiment will be described as an embodiment of the lens module 300. It should be noted that the data listed in Table 4 of V is not intended to limit the present invention, and the technical field of the invention has the knowledge that the parameters of the original invention can be applied after the reference to the present invention. Appropriate changes, but they still fall within the scope of the invention. (Table 4) Surface Curvature Radius (mm) Spacing (mm) Refractive Index Abbe Number Remarks S1 - 7.56726 0.774597 1.69592 32.73821 First Lens S2 ~~ .. I - -49.3447 1.068661 X S3 -8.85348 1.277076 1.804581 45.99062 Second Lens S4 -6.7022 0.05 \ S5 10.89912 1.5055 1.806073 40.70956 Sixth lens S6 -25.2964 0 \ S7 Infinite 0.01962 \ Aperture stop S8 7.321552 1.415775 1.7746 44.57834 Third lens S9 12.7861 0.739861 \ S10 76.02054 0.782778 1.84241 22.95441 Fourth lens 21 201128251 One...- —3569twf,doc/n Sll 5.662418 9.795562 \ \ S12 10.6557 2.982835 1.67511 60.28958 Fifth lens S13 60.51079 1.325 \ \ S14 Infinite 0.65 1.508469 61.1878 Glass cover S15 Infinite 0.709 \ S16 Infinite

In Table 6, 'pitch is the linear distance between two adjacent surfaces on the optical axis A', for example, the distance between the surfaces S3, that is, the linear distance between the surface S3 and the surface S4 on the optical axis A. For the thickness, refractive index and Abbe number of each lens in the remarks, refer to the values in the same column, the refractive index and the Abbe number. Further, in Table 1, the surfaces S1, S2 are the two surfaces of the first lens 312, the surfaces S3, S4 are the two surfaces of the second lens 314, the surfaces 85, 86 are the two surfaces of the sixth lens 316, and the surface 57 is the aperture The surface of the aperture 350' S8, S9 is the two surfaces of the third lens 332, the surfaces S10, S11 are the two surfaces of the fourth lens 334, and the surfaces S12, SB are the fifth surface

, the two surfaces of the 342. The surfaces S14, S15 are the two surfaces of a cover glass 70 for the light valve 6''. In the lens module 300, since the third lens 332 and the sixth lens 316 疋 are aspherical design as an example, the surfaces S5, S6, and S8, which are aspherical rather than spherical, are as follows: 10 C2h12+C2hM+ C, h16 22 201128251 r 11 〇ju 33569twf.doc/n where 'Z is the offset of the optical axis L direction. r is the radius of the osculating sphere, that is, the radius of curvature near the optical axis (such as the radius of curvature of S, S2, S8, and S9 in the table). k is a conic constant (c〇nic constant). h is the vertical height from the optical axis on the aspherical surface, which is the height from the center of the lens to the edge of the lens. It can be known from the formula that different h will correspond to different z values. ο~C16 is an aspheric coefficient. The aspherical coefficients and k values of the surfaces S5, S6, S8, and S9 are as shown in Table 5: <Table 5>

SI S2 S8 S9 K -19.3573 -69.443 —4.77467 ---~ -96.2801 C2 0 0 0 --- 0 C4 1.5405E-03 2.233 IE-03 3.6161E-03 3.7748E-03 C6 -1.3100E-05 -1.1417 E-04 -5.7640E-06 —» 一-6.0345E-04 C8 4.6944E-06 ~ ...— -8.3352E-08 -2.8501E-05 1.3846E-04 Cio -4.371 IE-07 7.0387E-07 4.6477E-06 —1 —2.2658E-05 Ci2 -3.5285E-09 - ------—— -4.9956E-08 -3.3397E-07 2.5427E-06 Ci4 2-5518E-09 9.8620E-10 1.5224 E-08 -1.5636E-07 Ci6 -1.0934E-10 -1.5635E-11 -4 1 c\ 灵々k,Λ· * k 丄·, - . — ^*〇U JZJti-1U Also in Table 6 Some of the analog parameter values of the lens module 300 are listed as including the effective focal length (EFL), the field of view, the telecentric angle, and the analog values of the lens module 300 satisfying the aforementioned conditions - to condition 6. , 201128251, X 1 X 0-&gt;V ~3 3569twf.doc/n _effective focal length __ _field angle _ telecentric angle _Wf__ (I Ri 1 +R2)/( 1 Ri 1 -R2)

V

V fsGi 1 ! f LSG2 y f f3/ff41 /f fG3/f

-------__l.JZJ As described above, the embodiment of the present invention can be used. Since at least part of the lens of the lens module uses an aspherical lens (in addition to the better imaging quality (such as correction aberration), the number of lenses is also small and has a smaller size. The structure of the group can effectively eliminate the effects of aberration, chromatic aberration, distortion, and at least one of the above-mentioned imaging materials. The first sub-lens group closest to the magnification side is negative diopter, and the surface is a concave surface. It is possible to add two or two with a better mirror group relative to the third lens group (10) ten from the lens group and the second head module to reduce the vicinity of the side of the 'm Gui and _ third lens group to make the mirror). Therefore, the hairline is nearly parallel to the optical axis (approximately 3 degrees of the lens module provided in the example, which has a size of 24 201128251^rx joji/ 33569twf.doc/n smaller and better optical characteristics. The present invention is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are still It is intended to cover all of the objects or advantages or features of the present invention. The abstract and the title are only used to assist in the search of patent documents. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of a lens module according to an embodiment of the present invention. FIG. 2A to FIG. 2D are lens modules of FIG. FIG. 3 is a schematic structural view of a lens module according to another embodiment of the present invention. [Description of Main Components] 60: Image Processing Element 70: Glass Cover 100, 300 : lens module 110, 310: first lens group 120, 320: aperture 阑 130 '330: second lens 君 140, 340: third lens group 25 ^ 3569 twf. doc / n 201128251 110a, 310a: first Sub-lens group 110b, 310b: second sub-lens group 112: first lens 114: second lens 132: third lens 134: fourth lens 142: fifth lens 316: sixth lens A: optical axis L: total length L 〗. Distance S1~S16: Surface 26

Claims (1)

201128251 mo^u 33569twf.doc/n VII. Patent application scope: 1. A lens module, including: jdr is disposed between the magnification side and the reduction side, and if from the magnification side to the reduction side The second-sub, the syllabary group, the eight-dot-mirror-sub-lens group and the first-sub-lens group have a negative diopter and the positive refractive lens group has a first lens, and eight sons The second sub-lens group has a second lens. The m-mirror group is disposed on the 鄕-transmission-reduction side-the third lens and the fourth lens, and the third lens Having a positive refracting power and a negative refracting power, respectively, wherein a surface of the second lens group adjacent to the reduced side is a second surface; and a third lens group is disposed on the second lens group and the shrinking lens Positive diopter 'and includes a fifth lens ′, wherein a surface of the third lens group that is close to the magnification side is a third surface; and an aperture stop disposed at the second sub-lens group and the second Between the two, wherein the effective focal length of the lens module is f' the distance from the center of the second surface to the center of the third surface is Li 'the lens module is Wfcu. σ 2. The lens module according to claim 1, wherein the second surface is a concave surface. The lens module according to claim 1, wherein Shihe 201128251, 1 X * _/ 3569twf.doc/n St:: the lens, the third lens, the fourth lens and the fifth lens are each an aspherical lens.斤^ * Apply for the lens module described in item i of the patent scope, in the basin of Gu Haidi = the curvature of the lens facing the magnifying side - the curvature of the surface is half, the orientation of the four lenses is small _ - the surface (10) radius, And the head group meets 0.7&lt;(|Ri hR2)/(|Ri 尺2)&lt;4〇乂 5. The lens module of claim 2, wherein the Abbe number of the second lens is ~, and the Abbe number of the fourth lens is ^ the lens module conforms to 20 &lt;^-^&lt;;30. The lens module of claim 1, wherein the effective sub-lens group has an effective f and a distance of fsGi, and the second sub-lens group has a focal length of fSG2, and the lens module Compliant with 〇5 &lt; | fsGi | / f&lt; 4丨 and 0.3 &lt; fSG2/ f&lt; 0.95. The lens module of claim 1, wherein the first lens has an effective focal length of f3, the fourth lens has an effective focal length of f4, and the lens module conforms to 0.5<f3 / f< 2 and 0.35 <丨f4丨/ f &lt; 0.9. 8) The lens module of claim 1, wherein the second lens group has an effective focal length of 圮3, and the lens module conforms to 8.8&lt;fc3/f&lt;2. 9. The lens module of claim 1, wherein the first lens has a negative refracting power and the second lens has a positive refracting power. 10. The lens module of claim 2, wherein a surface of the first lens group closest to the magnification side is a concave surface, and the second 28 201128251 33569 twf.doc/n lens group is closest A surface of the magnification side is a convex surface. 11. The lens module of claim 1, wherein the fifth lens has a positive refracting power. 12. The lens module of claim 11, wherein a surface of the fifth lens facing the enlarged side is a convex surface. 13. The lens module of claim 1, wherein the second sub-lens group further has a sixth lens disposed between the second lens and the aperture stop. The lens module of claim 13, wherein the first lens has a negative refracting power, the second lens has a positive refracting power, and the sixth lens has a positive refracting power. 15. The lens module of claim 14, wherein the surface of the lens/the lens facing the magnification side is a convex surface. The lens module of claim 1, wherein a surface of the second lens facing the enlarged side is a convex surface, and a surface of the fourth lens facing the reduced side is a concave surface. The lens module of claim 13, wherein the first lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are at least one Aspherical lens. 18. The lens module of claim 2, wherein the first lens group and the second lens group are a focus group, and the third lens group is [5] fixed D 29