Patent ID: 12196934

DETAILED DESCRIPTION OF THE INVENTION

The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

The present invention provides a lens assembly including a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, and a reflective element. The first lens group is with positive refractive power. The second lens group is with negative refractive power. The third lens group is with positive refractive power. The fourth lens group is with negative refractive power. The fifth lens group is with positive refractive power. The first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are arranged in order from a first side to a second side along an axis. A light from an object side sequentially passes through the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group to the second side. The reflective element includes a reflective surface and is disposed between the first side and the second side. Intervals of the lens groups are changeable, so that the lens assembly can change the effective focal length.

The effective focal length of the lens assembly of the present invention is a variable effective focal length and the zoom magnification of each embodiment of the lens assembly is about 3 times from the wide-angle end to the telephoto end. When the lens assembly is equipped with another fixed-focus wide-angle lens in a mobile phone, tablet or other camera device, the effective focal length of the lens assembly of the present invention has a zoom magnification of 4 to 12 times relative to the effective focal length of the fixed-focus wide-angle lens. Taking the lens assembly of the second embodiment of the present invention as an example, the effective focal length at the wide-angle end is 12.39 mm, the effective focal length at the telephoto end is 37.20 mm, and the zoom magnification is 3.002 (37.20 mm/12.39 mm=3.002) times from the wide-angle end to the telephoto end, which is approximately 3 times, when equipped with a fixed-focus wide-angle lens having an effective focal length of 3.1 mm in a mobile phone, tablet or other camera device and let the effective focal length of the fixed-focus wide-angle lens as the magnification basis, so the lens assembly of the present invention has a zoom magnification ranging from 4 (12.39 mm/3.1 mm=3.99≈4) times to 12 (37.20 mm/3.1 mm=12) times relative to a fixed-focus wide-angle lens with an effective focal length of 3.1 mm.

Referring to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, and Table 11, wherein Table 1, Table 4, Table 7, and Table 10 show optical specification in accordance with a first, second, third, and fourth embodiments of the invention, respectively and Table 2, Table 5, Table 8, and Table 11 show aspheric coefficients of each aspheric lens in Table 1, Table 4, Table 7, and Table 10, respectively.FIG.1,FIG.7,FIG.12, andFIG.17are lens layout diagrams of a lens assembly at the wide-angle end in accordance with a first, second, third, and fourth embodiments of the invention, respectively.FIG.2,FIG.8,FIG.13, andFIG.18are lens layout diagrams of the lens assembly at the middle end in accordance with the first, second, third, and fourth embodiments of the invention, respectively.FIG.3,FIG.9,FIG.14, andFIG.19are lens layout diagrams of the lens assembly at the telephoto end in accordance with the first, second, third, and fourth embodiments of the invention, respectively.

The reflective element P1, P2, P3, P4includes an incident surface S11, S21, S31, S41, a reflective surface S12, S22, S32, S42(not shown), and an exit surface S13, S23, S33, S43. The first lens groups LG11, LG21, LG31, LG41is with positive refractive power and includes a 1-1 lens L11, L21, L31, L41and a 1-2 lens L12, L22, L32, L42. The second lens groups LG12, LG22, LG32, LG42is with negative refractive power and includes a 2-1 lens L13, L23, L33, L43, a 2-2 lens L14, L24, L34, L44, and a 2-3 lens L15, L25, L35, L45. The third lens group LG13, LG23, LG33, LG43is with positive refractive power and includes a 3-1 lens L16, L26, L36, L46, a 3-2 lens L17, L27, L37, L47, a 3-3 lens L18, L28, L38, L48, and a 3-4 lens L19, L29, L39, L49. The fourth lens group LG14, LG24, LG34, LG44is with negative refractive power and includes a 4-1 lenses L110, L210, L310, L410. The fifth lens group LG15, LG25, LG35, LG45is with positive refractive power and includes a 5-1 lens L111, L211, L311, L411.

The reflective elements P1, P2, P3, P4are made of glass or plastic material, wherein the incident surfaces S11, S21, S31, S41connect to the reflective surfaces S12, S22, S32, S42(not shown) and are perpendicular to the exit surfaces S13, S23, S33, S43. The incident surfaces S11, S21, S31, S41, the reflective surfaces S12, S22, S32, S42(not shown), and the exit surfaces S13, S23, S33, S43are plane surfaces.

The 1-1 lenses L11, L21, L31, L41are meniscus lenses with negative refractive power and made of glass material, wherein both of the first side surfaces S14, S24, S34, S44and second side surfaces S15, S25, S35, S45are spherical surfaces.

The 1-2 lenses L12, L22, L32, L42are biconvex lenses with positive refractive power and made of glass material, wherein the first side surfaces S16, S26, S36, S46are convex surfaces, the second side surfaces S17, S27, S37, S47are convex surfaces, the first side surfaces S16, S26, S36, S46are spherical surfaces, and the second side surfaces S17, S27, S37, S47are aspheric surfaces.

The shading elements ST11, ST21, ST31, ST41include a variable hole. The variable hole is a non-circular hole and can change dimension according to the effective focal length of the lens assembly. The above shading elements are variable shades, wherein the non-circular hole is viewed from the axis direction, the shape of the non-circular hole can be polygon, polygon symmetrical to axis, polygon asymmetric to axis, racetrack shape, bottle shape, oak barrel shape, wave shape, flower shape, leaf shape, cloud shape, star shape, zigzag shape, heart shape, shape composed of straight lines and arcs, or shape composed of irregular lines. Such a design is benefit to the effective reduction in size, thickness and volume of the lens assembly, wherein some of the shapes such as wave, cloud, star, and zigzag can also reduce stray light and ghost images.

The 2-1 lenses L13, L23, L33, L43are meniscus lenses with negative refractive power and made of glass material, wherein the first side surfaces S19, S29, S39, S49are convex surfaces, the second side surfaces S110, S210, S310, S410are concave surfaces, the first side surfaces S19, S29, S39, S49are aspheric surfaces, and the second side surfaces S110, S210, S310, S410are spherical surfaces.

The 2-2 lenses L14, L24, L34, L44are biconcave lenses with negative refractive power and made of glass material, wherein the first side surfaces S111, S211, S311S411are concave surfaces, the second side surfaces S112, S212, S312, S412are concave surfaces, and both of the first side surfaces S111, S211, S311S411and second side surfaces S112, S212, S312, S412are spherical surfaces.

The 2-3 lenses L15, L25, L35, L45are with positive refractive power and made of glass material, wherein the first side surfaces S113, S213, S313S413are convex surfaces and both of the first side surfaces S113, S213, S313S413and second side surfaces S114, S214, S314, S414are aspheric surfaces.

The holes of the stop ST12, ST22, ST32, ST42are fixed in dimension and shaped in non-circular.

The 3-1 lenses L16, L26, L36, L46are plano-convex lenses with positive refractive power and made of glass material, wherein the first side surfaces S116, S216, S316, S416are convex surfaces, the second side surfaces S117, S217, S317, S417are plane surfaces, and the first side surfaces S116, S216, S316, S416are aspheric surfaces.

The 3-2 lenses L17, L27, L37, L47are biconvex lenses with positive refractive power and made of glass material, wherein the first side surfaces S118, S218, S318, S418are convex surfaces, the second side surfaces S119, S219, S319, S419are convex surfaces, and both of the first side surfaces S118, S218, S318, S418and second side surfaces S119, S219, S319, S419are aspheric surfaces.

The 3-3 lenses L18, L28, L38, L48are meniscus lenses with negative refractive power and made of glass material, wherein the first side surfaces S120, S220, S320, S420are concave surfaces, the second side surfaces S121, S221, S321, S421are convex surfaces, the first side surfaces S120, S220, S320, S420are spherical surfaces, and the second side surfaces S121, S221, S321, S421are aspheric surfaces.

The 3-4 lenses L19, L29, L39, L49are meniscus lenses with negative refractive power and made of glass material, wherein the first side surfaces S122, S222, S322, S422are convex surfaces, the second side surfaces S123, S223, S323, S423are concave surfaces, the first side surfaces S122, S222, S322, S422are aspheric surfaces, and the second side surfaces S123, S223, S323, S423are spherical surfaces.

The 4-1 lenses L110, L210, L310, L410are meniscus lenses with negative refractive power and made of plastic material, wherein both of the first side surfaces S124, S224, S324, S424and second side surfaces S125, S225, S325, S425are aspheric surfaces.

The 5-1 lenses L111, L211, L311, L411are meniscus lenses with positive refractive power and made of plastic material, wherein both of the first side surfaces S126, S226, S326, S426and second side surfaces S127, S227, S327, S427are aspheric surfaces.

In addition, the lens assemblies1,2,3,4satisfy at least one of the following conditions:
1.5<f1/fW<2.5;  (1)
−1.1<f2/fW<−0.3;  (2)
0.6<f3/fW<0.8;  (3)
−2<f4/fW<−0.5;  (4)
1<f5/fW<3.5;  (5)
2<TTL/fW<4.5;  (6)
0.5<fT/TTL<1;  (7)
7 mm<Dmax<12 mm;  (8)
3.8<TTL/Dmax<5.2;  (9)
2.9<fT/D1r1<4.2;  (10)
0.5 mm<EPA/PL<5.5 mm;  (11)
0.7 mm<EPA/STD<10 mm;  (12)
0.2<EPDX/STD<2.1;  (13)
0<EPDY/STD<1.5;  (14)
0.8<PL/EPDX<4;  (15)
0.7<PH/EPDY<3;  (16)

wherein f1 is an effective focal length of the first lens groups LG11, LG21, LG31, LG41for the first to fourth embodiments, f2 is an effective focal length of the second lens groups LG12, LG22, LG32, LG42for the first to fourth embodiments, f3 is an effective focal length of the third lens groups LG13, LG23, LG33, LG43for the first to fourth embodiments, f4 is an effective focal length of the fourth lens groups LG14, LG24, LG34, LG44for the first to fourth embodiments, f5 is an effective focal length of the fifth lens groups LG15, LG25, LG35, LG45for the first to fourth embodiments, fW is an effective focal length of the lens assemblies1,2,3,4at the wide-angle end for the first to fourth embodiments, fT is an effective focal length of the lens assemblies1,2,3,4at the telephoto end for the first to fourth embodiments, TTL is respectively an interval from the incident surfaces S11, S21, S31, S41of the reflective elements P1, P2, P3, P4to image planes IMA1, IMA2, IMA3, IMA4along the direction perpendicular to the axes AX1, AX2, AX3, AX4and the axes AX1, AX2, AX3, AX4for the first to fourth embodiments, Dmax is a maximum effective optical diameter among all lenses for the first to fourth embodiments, D1r1 is an effective optical diameter of the first side surfaces S14, S24, S34, S44of the lenses L11, L21, L31, L41closest to first side for the first to fourth embodiments, EPA is an area of an entrance pupil of the lens assemblies1,2,3,4for the first to fourth embodiments, PL is a length of the reflective elements P1, P2, P3, P4, wherein the length is equal to a length of a side of the reflective surfaces S12, S22, S32, S42(not shown) and the side is perpendicular to the axes AX1, AX2, AX3, AX4for the first to fourth embodiments, STD is a diameter of the stops ST12, ST22, ST32, ST42for the first to fourth embodiments, EPDX is a maximum entrance pupil interval when the entrance pupil passes through the axis AX1, AX2, AX3, AX4for the first to fourth embodiments, EPDY is a minimum entrance pupil interval when the entrance pupil passes through the axis AX1, AX2, AX3, AX4for the first to fourth embodiments, and PH is a height of the reflective elements P1, P2, P3, P4, wherein the height is equal to a length of a side of the exit surfaces S13, S23, S33, S43and the direction of the side is perpendicular to the incident surfaces S11, S21, S31, S41for the first to fourth embodiments. With the lens assemblies1,2,3,4satisfying at least one of the above conditions (1)-(16), the total lens length can be effectively shortened, the thickness can be effectively shortened, the resolution can be effectively increased, the brightness uniformity can be effectively increased, the aberration can be effectively corrected, the chromatic aberration can be effectively corrected, and optical zoom function can be realized.

A detailed description of a lens assembly in accordance with a first embodiment of the invention is as follows. Referring toFIG.1,FIG.2, andFIG.3, the lens assembly1includes a reflective element P1, a first lens group LG11, a shading element ST11, a second lens group LG12, a stop ST12, a third lens group LG13, a fourth lens group LG14, a fifth lens group LG15, and an optical filter OF1, all of which are arranged in order from a first side to a second side along an axis AX1. The first lens group LG11includes a 1-1 lens L11and a 1-2 lens L12, both of which are arranged in order from the first side to the second side along the axis AX1. The second lens group LG12includes a 2-1 lens L13, a 2-2 lens L14, and a 2-3 lens L15, all of which are arranged in order from the first side to the second side along the axis AX1. The third lens group LG13includes a 3-1 lens L16, a 3-2 lens L17, a 3-3 lens L18, and a 3-4 lens L19, all of which are arranged in order from the first side to the second side along the axis AX1. The fourth lens group LG14includes a 4-1 lens L110. The fifth lens group LG15includes a 5-1 lens L111. The incident surface S11facing an object side (not shown) along the direction perpendicular to the axis. In operation, a light from the object side (not shown) incident on the reflective element P1from the incident surface S11first, then reflected by the reflective surface S12(not shown) to change propagation direction, then sequentially passes through the exit surface S13, the first lens group LG11, the shading element ST11, the second lens group LG12, the stop ST12, the third lens group LG13, the fourth lens group LG14, the fifth lens group LG15, and the optical filter OF1, and finally imaged on an image plane IMA1. The image plane IMA1is perpendicular to the incident surface S11and parallel to the exit surface S13. In the first embodiment, the reflective element P1is a prism and is not limited thereto. The reflective element P1can also be a mirror and only includes a reflective surface. In the above description, the first side is the conventional object side and the second side is the conventional image side.

When the lens assembly1zooms from the wide-angle end (as shown inFIG.1) to the middle end (as shown inFIG.2), the first lens group LG11is fixed, the second lens group LG12moves to the second side along the axis AX1, the third lens group LG13is fixed, the fourth lens group LG14moves to the second side along the axis AX1, and the fifth lens group LG15moves to the first side along the axis AX1, so that the interval between the first lens group LG11and the second lens group LG12is increased, the interval between the second lens group LG12and the third lens group LG13is decreased, the interval between the third lens group LG13and the fourth lens group LG14is increased, the interval between the fourth lens group LG14and the fifth lens group LG15is decreased, and the interval between the fifth lens group LG15and the optical filter OF1is increased. When the lens assembly1zooms from the middle end (as shown inFIG.2) to the telephoto end (as shown inFIG.3), the first lens group LG11is fixed, the second lens group LG12moves to the second side along the axis AX1, the third lens group LG13is fixed, the fourth lens group LG14moves to the first side along the axis AX1, and the fifth lens group LG15moves to the first side along the axis AX1, so that the interval between the first lens group LG11and the second lens group LG12is increased, the interval between the second lens group LG12and the third lens group LG13is decreased, the interval between the third lens group LG13and the fourth lens group LG14is decreased, the interval between the fourth lens group LG14and the fifth lens group LG15is increased, and the interval between the fifth lens group LG15and the optical filter OF1is increased. The zoom magnification is approximately 3 times (36.25 mm/12.41 mm≈2.9) as the lens assembly1of the first embodiment zooms from the wide-angle end (as shown inFIG.1) to the telephoto end (as shown inFIG.3).

The shading element ST11includes a variable hole (not shown) and the variable hole (not shown) can be changed in dimension by a driving element (not shown) driving the mechanism to achieve multi-stage changes in hole size. When the lens assembly1zooms from the wide-angle end (as shown inFIG.1) to the middle end (as shown inFIG.2) and from the middle end (as shown inFIG.2) to the telephoto end (as shown inFIG.3), the variable hole (not shown) of the shading element ST11will change according to the effective focal length of the lens assembly1. The correspondingly change in the size of the variable hole leads to change f-Number.

Among the first lens group LG11, the second lens group LG12, the third lens group LG13, the fourth lens group LG14, and the fifth lens group LG15, the effective optical range is non-circular symmetry for at least one lens, so that the effective optical diameter of the short side direction is different from the effective optical diameter of the long side direction. The region of the effective optical diameter is non-circular when lens is viewed from the axis direction, wherein the length of the long side is the maximum diameter which passes through the axis and the length of the short side is the minimum diameter which passes through the axis.FIG.6shows the effective optical diameter of the lens in the short side direction and long side direction when the lens assembly1of the first embodiment is at the telephoto end. FromFIG.6, it can be seen that the effective optical diameter of the long side direction is significantly larger than that of the short side direction.

The 3-2 lens L17and 3-3 lens L18of the third lens group LG13can move perpendicular to the axis AX1to achieve optical image stabilization. The fourth lens group LG14can move along the axis AX1to achieve auto focus.

According to the foregoing, wherein: the first side surface S14of the 1-1 lens L11is a convex surface and the second side surface S15of the 1-1 lens L11is a concave surface; the 2-3 lens L15is a meniscus lens, wherein the second side surface S114is a concave surface; the first side surface S124of the 4-1 lens L110is a convex surface and the second side surface S125of the 4-1 lens L110is a concave surface; the first side surface S126of the 5-1 lens L111is a convex surface and the second side surface S127of the 5-1 lens L111is a concave surface; and both of the first side surface S128and second side surface S129of the optical filter OF1are plane surfaces.

With the above design of the lenses, reflective element P1, shading element ST11, stop ST12, and at least one of the conditions (1)-(10) satisfied, the lens assembly1can have an effective shortened total lens length, an effective decreased thickness, an effective increased resolution, an effective increased brightness uniformity, an effective corrected aberration, an effective corrected chromatic aberration, and a realized optical zoom function. The preferred embodiment of the present invention can be achieved when the lens assembly satisfies conditions (1)-(10), refractive power distribution, and surface shape.

Table 1 shows the optical specification of the lens assembly1inFIG.1,FIG.2, andFIG.3when the lens assembly1is at the wide-angle end, middle end, and telephoto end, respectively.

TABLE 1Wide-angle EndEffective FocalF-number = 3.85Length = 12.41 mmTotal LensField of View =Length = 40.258 mm23.442 degreesMiddle EndEffective FocalF-number = 3.94Length = 22.08 mmTotal LensField of View =Length = 40.258 mm13.450 degreesTelephoto EndEffective FocalF-number = 4.00Length = 36.25 mmTotal Lens LengthField of View =40.258 = mm8.284 degreesRadiusEffectiveofFocalSurfaceCurvatureThicknessLengthNumber(mm)(mm)NdVd(mm)RemarkS11∞3.21.5264.1P1S12∞3.21.5264.1S13∞0.400S1412.3340.7001.8523.8−67.76L11S159.8810.088S168.8382.3351.4984.515.80L12S17−53.5310.319S18∞0.213ST11(Wide-angle End)4.857(Middle End)8.476(Telephoto End)S1969.9050.6001.4984.5−10.89L13S1104.9060.898S111−7.7890.5001.7449.2−7.33L14S11218.4790.102S1138.0630.7221.931.111.18L15S11440.1218.932(Wide-angle End)4.288(Middle End)0.669(Telephoto End)S115∞−0.535ST12S1167.2681.0751.4984.514.96L16S117∞0.453S1186.6122.3031.4984.57.52L17S119−7.2420.203S120−7.5540.4741.825.5−63.45L18S121−9.1230.476S12233.1330.4321.8540.4−10.08L19S1236.7765.211(Wide-angle End)5.803(Middle End)0.762(Telephoto End)S12447.0331.0001.5456.1−15.09L110S1256.8303.652(Wide-angle End)1.327(Middle End)4.465(Telephoto End)S1269.8081.2501.6225.925.26L111S12725.4880.845(Wide-angle End)2.578(Middle End)4.482(Telephoto End)S128∞0.2101.5264.2OF1S129∞1.000

The aspheric surface sag z of each aspheric lens in table 1 can be calculated by the following formula:
z=ch2/{1+[1−(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12+Fh14+Gh16
where c is curvature, h is the vertical distance from the lens surface to the axis, k is conic constant and A, B, C, D, E, F and G are aspheric coefficients.

In the first embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric lens are shown in Table 2.

TABLE 2SurfaceABCNumberkEFGDS1707.15E−051.54E−06−6.15937E−086.18872E−108.13454E−11−6.04687E−121.31793E−13S1900.000435−1.92E−052.07761E−05−4.6815E−066.44788E−081.9072E−07−2.38845E−08S1130−4.98E−051.96E−062.02558E−07−8.796E−07−3.13598E−07−6.16445E−094.41308E−09S11400.0005562.35E−051.56135E−07−9.07131E−07−1.32137E−07−4.7033E−086.54429E−09S1160−0.000141.25E−05−5.98813E−063.48377E−072.78766E−08−6.65173E−092.5121E−10S1180−0.000691−1.36E−052.13558E−06−1.53882E−074.56552E−082.10236E−09−4.2671E−11S11900.0001913.06E−051.97305E−06−7.94152E−071.25327E−071.73554E−08−2.28176E−09S12100.000386−1.55E−05−8.70191E−069.24493E−07000S1220−0.0006037.7E−05−2.05218E−05−4.30081E−072.00857E−071.11599E−07−1.46052E−08S1240−0.0019625.2E−050.000167839−3.58042E−051.34937E−06−4.83189E−079.38141E−08S1250−0.0023130.000304−0.0001352150.000108126−2.93511E−052.25638E−063.46292E−08S1260−0.002508−0.000213−7.1811E−06−3.1636E−06−1.09391E−071.75426E−07−1.18078E−08S1270−0.002675−0.000195−3.28272E−056.28998E−06−7.01173E−074.99686E−081.53888E−09

Table 3 shows the parameters and condition values for conditions (1)-(10) in accordance with the lens assembly1of the first embodiment. It can be seen from Table 3 that the lens assembly1of the first embodiment satisfies the conditions (1)-(10). In order to achieve the preferred embodiment of the present invention, at least one of the conditions (1)-(10) is satisfied.

TABLE 3f121.20mmf2−7.22mmf38.61mmf4−15.09mmf525.26mmDmax10.051mmD1r110.051mmf1/fW1.708f2/fW−0.582f3/fW0.694f4/fW−1.216f5/fW2.035TTL/fW3.244fT/TTL0.900TTL/Dmax4.005fT/D1r13.607

In addition, the lens assembly1of the first embodiment can meet the requirements of optical performance as seen inFIGS.4A-4B and5A-5B. It can be seen fromFIG.4Athat the field curvature of tangential direction and sagittal direction in the lens assembly1of the first embodiment at the wide-angle end ranges from −0.08 mm to 0.05 mm. It can be seen fromFIG.4Bthat the distortion in the lens assembly1of the first embodiment at the wide-angle end ranges from 0% to 2%. It can be seen fromFIG.5Athat the field curvature of tangential direction and sagittal direction in the lens assembly1of the first embodiment at the telephoto end ranges from −0.10 mm to 0.06 mm. It can be seen fromFIG.5Bthat the distortion in the lens assembly1of the first embodiment at the telephoto end ranges from 0% to 1%. In addition, the field curvature and distortion in the lens assembly1of the first embodiment at the middle end can also meet the requirements, and the figures are omitted here. It is obvious that the field curvature and the distortion of the lens assembly1of the first embodiment can be corrected effectively. Therefore, the lens assembly1of the first embodiment is capable of good optical performance.

Referring toFIG.7,FIG.8, andFIG.9, the lens assembly2includes a reflective element P2, a first lens group LG21, a shading element ST21, a second lens group LG22, a stop ST22, a third lens group LG23, a fourth lens group LG24, a fifth lens group LG25, and an optical filter OF2, all of which are arranged in order from a first side to a second side along an axis AX2. The first lens group LG21includes a 1-1 lens L21and a 1-2 lens L22, both of which are arranged in order from the first side to the second side along the axis AX2. The second lens group LG22includes a 2-1 lens L23, a 2-2 lens L24, and a 2-3 lens L25, all of which are arranged in order from the first side to the second side along the axis AX2. The third lens group LG23includes a 3-1 lens L26, a 3-2 lens L27, a 3-3 lens L28, and a 3-4 lens L29, all of which are arranged in order from the first side to the second side along the axis AX2. The fourth lens group LG24includes a 4-1 lens L210. The fifth lens group LG25includes a 5-1 lens L211. The incident surface S21facing an object side (not shown) along the direction perpendicular to the axis. In operation, a light from the object side (not shown) incident on the reflective element P2from the incident surface S21first, then reflected by the reflective surface S22(not shown) to change propagation direction, then sequentially passes through the exit surface S23, the first lens group LG21, the shading element ST21, the second lens group LG22, the stop ST22, the third lens group LG23, the fourth lens group LG24, the fifth lens group LG25, and the optical filter OF2, and finally imaged on an image plane IMA2. The image plane IMA2is perpendicular to the incident surface S21and parallel to the exit surface S23. In the second embodiment, the reflective element P2is a prism and is not limited thereto. The reflective element P2can also be a mirror and only includes a reflective surface.

When the lens assembly2zooms from the wide-angle end (as shown inFIG.7) to the middle end (as shown inFIG.8), the first lens group LG21is fixed, the second lens group LG22moves to the second side along the axis AX2, the third lens group LG23is fixed, the fourth lens group LG24moves to the second side along the axis AX2, and the fifth lens group LG25moves to the first side along the axis AX2, so that the interval between the first lens group LG21and the second lens group LG22is increased, the interval between the second lens group LG22and the third lens group LG23is decreased, the interval between the third lens group LG23and the fourth lens group LG24is increased, the interval between the fourth lens group LG24and the fifth lens group LG25is decreased, and the interval between the fifth lens group LG25and the optical filter OF2is increased. When the lens assembly2zooms from the middle end (as shown inFIG.8) to the telephoto end (as shown inFIG.9), the first lens group LG21is fixed, the second lens group LG22moves to the second side along the axis AX2, the third lens group LG23is fixed, the fourth lens group LG24moves to the first side along the axis AX2, and the fifth lens group LG25moves to the first side along the axis AX2, so that the interval between the first lens group LG21and the second lens group LG22is increased, the interval between the second lens group LG22and the third lens group LG23is decreased, the interval between the third lens group LG23and the fourth lens group LG24is decreased, the interval between the fourth lens group LG24and the fifth lens group LG25is increased, and the interval between the fifth lens group LG25and the optical filter OF2is increased. The zoom magnification is approximately 3.00 times (37.20 mm/12.39 mm≈3.0) as the lens assembly2of the second embodiment zooms from the wide-angle end (as shown inFIG.7) to the telephoto end (as shown inFIG.9).

The shading element ST21includes a variable hole (not shown) and the variable hole (not shown) can be changed in dimension by a driving element (not shown) driving the mechanism to achieve multi-stage changes in hole size. When the lens assembly2zooms from the wide-angle end (as shown inFIG.7) to the middle end (as shown inFIG.8) and from the middle end (as shown inFIG.8) to the telephoto end (as shown inFIG.9), the variable hole (not shown) of the shading element ST21will change according to the effective focal length of the lens assembly2. The correspondingly change in the size of the variable hole leads to change f-Number.

Among the first lens group LG21, the second lens group LG22, the third lens group LG23, the fourth lens group LG24, and the fifth lens group LG25, the effective optical range is non-circular symmetry for at least one lens, so that the effective optical diameter of the short side direction is different from the effective optical diameter of the long side direction. When the lens assembly2is at the telephoto end, the schematic diagram of the effective optical diameter of the lens in the short side direction and long side direction is similar toFIG.6.

The 3-2 lens L27and the 3-3 lens L28of the third lens group LG23can move perpendicular to the axis AX2to achieve optical image stabilization. The fourth lens group LG24can move along the axis AX2to achieve auto focus.

According to the foregoing, wherein: the first side surface S24of the 1-1 lens L21is a convex surface and the second side surface S25of the 1-1 lens L21is a concave surface; the 2-3 lens L25is a meniscus lens, wherein the second side surface S214is a concave surface; the first side surface S224of the 4-1 lens L210is a convex surface and the second side surface S225of the 4-1 lens L210is a concave surface; the first side surface S226of the 5-1 lens L211is a convex surface and the second side surface S227of the 5-1 lens L211is a concave surface; and both of the first side surface S228and second side surface S229of the optical filter OF2are plane surfaces.

With the above design of the lenses, reflective element P2, shading element ST21, stop ST22, and at least one of the conditions (1)-(10) satisfied, the lens assembly2can have an effective shortened total lens length, an effective decreased thickness, an effective increased resolution, an effective increased brightness uniformity, an effective corrected aberration, an effective corrected chromatic aberration, and a realized optical zoom function. The preferred embodiment of the present invention can be achieved when the lens assembly satisfies conditions (1)-(10), refractive power distribution, and surface shape.

Table 4 shows the optical specification of the lens assembly2inFIG.7,FIG.8, andFIG.9when the lens assembly2is at the wide-angle end, middle end, and telephoto end, respectively.

TABLE 4Wide-angle EndEffective FocalF-number = 3.60Length = 12.39 mmTotal LensField of View =Length = 42.41 mm23.878 degreesMiddle EndEffective FocalF-number = 3.63Length = 21.44 mmTotal LensField of View =Length = 42.41 mm14.102 degreesTelephoto EndEffective FocalF-number = 3.92Length = 37.20 mmTotal LensField of View =Length = 42.41 mm8.272 degreesRadiusEffectiveofFocalSurfaceCurvatureThicknessLengthNumber(mm)(mm)NdVd(mm)RemarkS21∞3.21.5264.1P2S22∞3.21.5264.1S23∞0.4S2411.3480.71.8523.8−67.9L21S259.2210.099S268.9152.2481.4984.515.94L22S27−55.6750.328S28∞0.446ST21(Wide-angle End)4.626(Middle End)8.334(Telephoto End)S2964.6630.61.4984.5−10.75L23S2104.8360.930S211−8.0290.51.7449.3−7.33L24S21217.5600.086S2138.5480.9861.893110.79L25S21468.2399.299(Wide-angle End)4.776(Middle End)0.696(Telephoto End)S215∞−0.535ST22S2167.3991.0841.4984.515.17L26S217∞1.673S2186.6552.1631.4984.57.53L27S219−7.3230.200S220−7.5700.7341.825.5−57.06L28S221−9.4490.447S22231.7930.3611.8540.4−10.52L29S2236.9945.105(Wide-angle End)5.906(Middle End)0.898(Telephoto End)S22442.54511.5456.1−17.21L210S2257.5293.413(Wide-angle End)1.620(Middle End)5.064(Telephoto End)S22612.4441.5501.6225.927.67L211S22743.2750.979(Wide-angle End)2.314(Middle End)4.249(Telephoto End)S228∞0.211.5264.2OF2S229∞1.000

The definition of aspheric surface sag z of each aspheric lens in table 4 is the same as that of in Table 1, and is not described here again. In the second embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric lens are shown in Table 5.

TABLE 5SurfaceABCNumberkEFGDS2706.45E−059.1324E−07−6.3059E−089.00421E−109.13163E−11−4.73846E−127.03331E−14S2900.000456−5.12612E−052.67831E−05−3.91274E−06−1.47185E−071.14311E−07−8.79275E−09S21303.36E−059.65565E−06−1.5425E−06−7.79215E−07−1.42594E−073.83919E−09−2.24343E−10S21400.0004943.5816E−05−3.79677E−06−5.27769E−071.35433E−08−3.26754E−082.36278E−09S2160−0.00013−5.83733E−06−3.6559E−065.00927E−072.66469E−08−1.05443E−085.67945E−10S2180−0.000728.67169E−061.82049E−06−6.36512E−071.95523E−086.37337E−09−6.20868E−11S21900.0002122.74528E−052.05356E−06−7.83887E−077.88567E−088.35236E−09−6.03845E−10S22100.000185−9.37837E−06−6.7203E−066.4185E−07000S2220−0.000482.07229E−05−1.23259E−051.17469E−06−7.25898E−085.08508E−08−4.88141E−09S2240−0.0001−0.0001193729.79404E−05−3.84524E−055.41799E−06−1.45479E−07−2.8234E−08S2250−0.000320.00043514−0.0002835130.000100629−2.36046E−053.06054E−06−1.73027E−07S2260−0.00246−2.49098E−05−5.92326E−06−3.9626E−06−4.67764E−079.31335E−08−8.29703E−10S2270−0.003293.40461E−05−3.82429E−054.11113E−06−7.84039E−076.797E−08−5.43687E−10

Table 6 shows the parameters and condition values for conditions (1)-(10) in accordance with the lens assembly2of the second embodiment. It can be seen from Table 6 that the lens assembly2of the second embodiment satisfies the conditions (1)-(10). In order to achieve the preferred embodiment of the present invention, at least one of the conditions (1)-(10) is satisfied.

TABLE 6f121.49mmf2−7.34mmf39.12mmf4−17.21mmf527.67mmDmax10.183mmD1r110.183mmf1/fW1.734f2/fW−0.592f3/fW0.736f4/fW−1.389f5/fW2.233TTL/fW3.423fT/TTL0.877TTL/Dmax4.165fT/D1r13.653

In addition, the lens assembly2of the second embodiment can meet the requirements of optical performance as seen inFIGS.10A-10B and11A-11B. It can be seen fromFIG.10Athat the field curvature of tangential direction and sagittal direction in the lens assembly2of the second embodiment at the wide-angle end ranges from −0.04 mm to 0.02 mm. It can be seen fromFIG.10Bthat the distortion in the lens assembly2of the second embodiment at the wide-angle end ranges from 0% to 1%. It can be seen fromFIG.11Athat the field curvature of tangential direction and sagittal direction in the lens assembly2of the second embodiment at the telephoto end ranges from −0.06 mm to 0.08 mm. It can be seen fromFIG.11Bthat the distortion in the lens assembly2of the second embodiment at the telephoto end ranges from −2% to 0%. In addition, the field curvature and distortion in the lens assembly2of the second embodiment at the middle end can also meet the requirements, and the figures are omitted here. It is obvious that the field curvature and the distortion of the lens assembly2of the second embodiment can be corrected effectively. Therefore, the lens assembly2of the second embodiment is capable of good optical performance.

Referring toFIG.12,FIG.13, andFIG.14, the lens assembly3includes a reflective element P3, a first lens group LG31, a shading element ST31, a second lens group LG32, a stop ST32, a third lens group LG33, a fourth lens group LG34, a fifth lens group LG35, and an optical filter OF3, all of which are arranged in order from a first side to a second side along an axis AX3. The first lens group LG31includes a 1-1 lens L31and a 1-2 lens L32, both of which are arranged in order from the first side to the second side along the axis AX3. The second lens group LG32includes a 2-1 lens L33, a 2-2 lens L34, and a 2-3 lens L35, all of which are arranged in order from the first side to the second side along the axis AX3. The third lens group LG33includes a 3-1 lens L36, a 3-2 lens L37, a 3-3 lens L38, and a 3-4 lens L39, all of which are arranged in order from the first side to the second side along the axis AX3. The fourth lens group LG34includes a 4-1 lens L310. The fifth lens group LG35includes a 5-1 lens L311. The incident surface S31facing an object side (not shown) along the direction perpendicular to the axis. In operation, a light from the object side (not shown) incident on the reflective element P3from the incident surface S31first, then reflected by the reflective surface S32(not shown) to change propagation direction, then sequentially passes through the exit surface S33, the first lens group LG31, the shading element ST31, the second lens group LG32, the stop ST32, the third lens group LG33, the fourth lens group LG34, the fifth lens group LG35, and the optical filter OF3, and finally imaged on an image plane IMA3. The image plane IMA3is perpendicular to the incident surface S31and parallel to the exit surface S33. In the third embodiment, the reflective element P3is a prism and is not limited thereto. The reflective element P3can also be a mirror and only includes a reflective surface.

When the lens assembly3zooms from the wide-angle end (as shown inFIG.12) to the middle end (as shown inFIG.13), the first lens group LG31is fixed, the second lens group LG32moves to the second side along the axis AX3, the third lens group LG33is fixed, the fourth lens group LG34moves to the second side along the axis AX3, and the fifth lens group LG35moves to the first side along the axis AX3, so that the interval between the first lens group LG31and the second lens group LG32is increased, the interval between the second lens group LG32and the third lens group LG33is decreased, the interval between the third lens group LG33and the fourth lens group LG34is increased, the interval between the fourth lens group LG34and the fifth lens group LG35is decreased, and the interval between the fifth lens group LG35and the optical filter OF3is increased. When the lens assembly3zooms from the middle end (as shown inFIG.13) to the telephoto end (as shown inFIG.14), the first lens group LG31is fixed, the second lens group LG32moves to the second side along the axis AX3, the third lens group LG33is fixed, the fourth lens group LG34moves to the first side along the axis AX3, and the fifth lens group LG35moves to the first side along the axis AX3, so that the interval between the first lens group LG31and the second lens group LG32is increased, the interval between the second lens group LG32and the third lens group LG33is decreased, the interval between the third lens group LG33and the fourth lens group LG34is decreased, the interval between the fourth lens group LG34and the fifth lens group LG35is increased, and the interval between the fifth lens group LG35and the optical filter OF3is increased. The zoom magnification is approximately 2.976 times (36.84 mm/12.38 mm≈2.976) as the lens assembly3of the third embodiment zooms from the wide-angle end (as shown inFIG.12) to the telephoto end (as shown inFIG.14).

The shading element ST31includes a variable hole (not shown) and the variable hole (not shown) can be changed in dimension by a driving element (not shown) driving the mechanism to achieve multi-stage changes in hole size. When the lens assembly3zooms from the wide-angle end (as shown inFIG.12) to the middle end (as shown inFIG.13) and from the middle end (as shown inFIG.13) to the telephoto end (as shown inFIG.14), the variable hole (not shown) of the shading element ST31will change according to the effective focal length of the lens assembly3. The correspondingly change in the size of the variable hole leads to change f-Number.

Among the first lens group LG31, the second lens group LG32, the third lens group LG33, the fourth lens group LG34, and the fifth lens group LG35, the effective optical range is non-circular symmetry for at least one lens, so that the effective optical diameter of the short side direction is different from the effective optical diameter of the long side direction. When the lens assembly3is at the telephoto end, the schematic diagram of the effective optical diameter in the short side direction and long side direction is similar toFIG.6.

The 3-2 lens L37and the 3-3 lens L38of the third lens group LG33can move perpendicular to the axis AX3to achieve optical image stabilization. The fourth lens group LG34can move along the axis AX3to achieve auto focus.

According to the foregoing, wherein: the first side surface S34of the 1-1 lens L31is a convex surface and the second side surface S35of the 1-1 lens L31is a concave surface; the 2-3 lens L35is a meniscus lens, wherein the second side surface S314is a concave surface; the first side surface S324of the 4-1 lens L310is a convex surface and the second side surface S325of the 4-1 lens L310is a concave surface; the first side surface S326of the 5-1 lens L311is a convex surface and the second side surface S327of the 5-1 lens L311is a concave surface; and both of the first side surface S328and second side surface S329of the optical filter OF3are plane surfaces.

With the above design of the lenses, reflective element P3, shading element ST31, stop ST32, and at least one of the conditions (1)-(10) satisfied, the lens assembly3can have an effective shortened total lens length, an effective decreased thickness, an effective increased resolution, an effective increased brightness uniformity, an effective corrected aberration, an effective corrected chromatic aberration, and a realized optical zoom function. The preferred embodiment of the present invention can be achieved when the lens assembly satisfies conditions (1)-(10), refractive power distribution, and surface shape.

Table 7 shows the optical specification of the lens assembly3inFIG.12,FIG.13, andFIG.14when the lens assembly3is at the wide-angle end, middle end, and telephoto end, respectively.

TABLE 7Wide-angle EndEffective FocalF-number = 3.67Length = 12.38 mmTotal LensField of View =Length = 41.16 mm23.584 degreesMiddle EndEffective FocalF-number = 3.90Length = 22.24 mmTotal LensField of View =Length = 41.16 mm13.338 degreesTelephoto EndEffective FocalF-number = 4.11Length = 36.84 mmTotal LensField of View =Length = 41.16 mm8.104 degreesRadiusEffectiveofFocalSurfaceCurvatureThicknessLengthNumber(mm)(mm)NdVd(mm)RemarkS31∞3.21.5264.1P3S32∞3.21.5264.1S33∞0.4S3412.2080.71.8523.8−65.52L31S359.7550.086S369.1842.3041.4984.515.91L32S37−45.8410.319S38∞0.211ST31(Wide-angle End)5.001(Middle End)8.598(Telephoto End)S3968.4920.61.4984.5−10.37L33S3104.6970.937S311−7.9990.51.7449.3−7.27L34S31217.2580.086S3138.0920.7691.8931.210.46L35S31455.8529.042(Wide-angle End)4.252(Middle End)0.654(Telephoto End)S315∞−0.535ST32S3167.1921.0461.4984.514.75L36S317∞0.427S3186.9222.3361.4984.57.77L37S319−7.4520.193S320−7.7131.1061.825.5−99.45L38S321−9.0780.396S32229.0610.2741.8540.4−10.42L39S3236.8074.887(Wide-angle End)6.124(Middle End)1.040(Telephoto End)S32438.39111.5456.1−18.76L310S3257.9094.466(Wide-angle End)1.393(Middle End)4.936(Telephoto End)S3269.7601.1721.6225.936.18L311S32716.4990.827(Wide-angle End)2.663(Middle End)4.206(Telephoto End)S328∞0.211.5264.2OF3S329∞1.00

The definition of aspheric surface sag z of each aspheric lens in table 7 is the same as that of in Table 1, and is not described here again. In the third embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric lens are shown in Table 8.

TABLE 8SurfaceABCNumberkEFGDS3707.74E−05−1.3E−07−4.65017E−083.44861E−097.12852E−11−1.22147E−112.70905E−13S3900.000378−3.9E−052.93851E−05−5.98744E−06−2.47616E−072.6487E−07−2.57839E−08S31301.3E−056.74E−063.5281E−06−6.44877E−07−3.22545E−07−2.94857E−094.40722E−09S31400.0005064.21E−05−4.64566E−07−5.50659E−07−4.07887E−08−5.63786E−086.91588E−09S31607.15E−05−3E−06−8.21374E−064.34831E−075.14282E−08−7.24504E−091.76901E−10S3180−0.000771.68E−054.9357E−06−2.75194E−072.48411E−09−3.58351E−113.63976E−10S31900.0004834.83E−06−9.94519E−07−5.58485E−071.13955E−071.09808E−08−1.51774E−09S32100.000415−2.9E−05−8.39894E−061.20178E−06000S3220−0.000432.29E−05−2.91744E−051.97101E−073.80831E−071.0539E−07−1.51577E−08S3240−0.00019−0.00010.000120122−3.48317E−054.47423E−06−2.80257E−07−9.02869E−09S3250−0.000610.000419−0.0002260479.8044E−05−2.45739E−053.06265E−06−1.67435E−07S3260−0.002898.09E−063.65987E−06−2.69255E−06−5.08362E−076.18004E−083.18327E−09S3270−0.003223.3E−05−1.7849E−053.6978E−06−1.06703E−066.55006E−083.77986E−09

Table 9 shows the parameters and condition values for conditions (1)-(10) in accordance with the lens assembly3of the third embodiment. It can be seen from Table 9 that the lens assembly3of the third embodiment satisfies the conditions (1)-(10). In order to achieve the preferred embodiment of the present invention, at least one of the conditions (1)-(10) is satisfied.

TABLE 9f121.61mmf2−7.28mmf38.82mmf4−18.76mmf536.18mmDmax10.035mmD1r110.035mmf1/fW1.746f2/fW−0.588f3/fW0.712f4/fW−1.515f5/fW2.922TTL/fW3.325fT/TTL0.895TTL/Dmax4.102fT/D1r13.671

In addition, the lens assembly3of the third embodiment can meet the requirements of optical performance as seen inFIGS.15A-15B and16A-16B. It can be seen fromFIG.15Athat the field curvature of tangential direction and sagittal direction in the lens assembly3of the third embodiment at the wide-angle end ranges from −0.04 mm to 0.02 mm. It can be seen fromFIG.15Bthat the distortion in the lens assembly3of the third embodiment at the wide-angle end ranges from 0% to 2%. It can be seen fromFIG.16Athat the field curvature of tangential direction and sagittal direction in the lens assembly3of the third embodiment at the telephoto end ranges from −0.02 mm to 0.08 mm. It can be seen fromFIG.16Bthat the distortion in the lens assembly3of the third embodiment at the telephoto end ranges from 0% to 1%. In addition, the field curvature and distortion in the lens assembly3of the third embodiment at the middle end can also meet the requirements, and the figures are omitted here. It is obvious that the field curvature and the distortion of the lens assembly3of the third embodiment can be corrected effectively. Therefore, the lens assembly3of the third embodiment is capable of good optical performance.

Referring toFIG.17,FIG.18, andFIG.19, the lens assembly4includes a reflective element P4, a first lens group LG41, a shading element ST41, a second lens group LG42, a stop ST42, a third lens group LG43, a fourth lens group LG44, a fifth lens group LG45, and an optical filter OF4, all of which are arranged in order from a first side to a second side along an axis AX4. The first lens group LG41includes a 1-1 lens L41and a 1-2 lens L42, both of which are arranged in order from the first side to the second side along the axis AX4. The second lens group LG42includes a 2-1 lens L43, a 2-2 lens L44, and a 2-3 lens L45, all of which are arranged in order from the first side to the second side along the axis AX4. The third lens group LG43includes a 3-1 lens L46, a 3-2 lens L47, a 3-3 lens L48, and a 3-4 lens L49, all of which are arranged in order from the first side to the second side along the axis AX4. The fourth lens group LG44includes a 4-1 lens L410. The fifth lens group LG45includes a 5-1 lens L411. The incident surface S41facing an object side (not shown) along the direction perpendicular to the axis. In operation, a light from the object side (not shown) incident on the reflective element P4from the incident surface S41first, then reflected by the reflective surface S42(not shown) to change propagation direction, then sequentially passes through the exit surface S43, the first lens group LG41, the shading element ST41, the second lens group LG42, the stop ST42, the third lens group LG43, the fourth lens group LG44, the fifth lens group LG45, and the optical filter OF4, and finally imaged on an image plane IMA4. The image plane IMA4is perpendicular to the incident surface S41and parallel to the exit surface S43. In the fourth embodiment, the reflective element P4is a prism and is not limited thereto. The reflective element P4can also be a mirror and only includes a reflective surface.

When the lens assembly4zooms from the wide-angle end (as shown inFIG.17) to the middle end (as shown inFIG.18), the first lens group LG41is fixed, the second lens group LG42moves to the second side along the axis AX4, the third lens group LG43is fixed, the fourth lens group LG44moves to the second side along the axis AX4, and the fifth lens group LG45moves to the second side along the axis AX4, so that the interval between the first lens group LG41and the second lens group LG42is increased, the interval between the second lens group LG42and the third lens group LG43is decreased, the interval between the third lens group LG43and the fourth lens group LG44is increased, the interval between the fourth lens group LG44and the fifth lens group LG45is increased, and the interval between the fifth lens group LG45and the optical filter OF4is decreased. When the lens assembly4zooms from the middle end (as shown inFIG.18) to the telephoto end (as shown inFIG.19), the first lens group LG41is fixed, the second lens group LG42moves to the second side along the axis AX4, the third lens group LG43is fixed, the fourth lens group LG44moves to the first side along the axis AX4, and the fifth lens group LG45moves to the second side along the axis AX4, so that the interval between the first lens group LG41and the second lens group LG42is increased, the interval between the second lens group LG42and the third lens group LG43is decreased, the interval between the third lens group LG43and the fourth lens group LG44is decreased, the interval between the fourth lens group LG44and the fifth lens group LG45is increased, and the interval between the fifth lens group LG45and the optical filter OF4is decreased. The zoom magnification is approximately 3.218 times (29.93 mm/9.30 mm≈3.218) as the lens assembly4of the fourth embodiment zooms from the wide-angle end (as shown inFIG.17) to the telephoto end (as shown inFIG.19).

The shading element ST41includes a variable hole (not shown) and the variable hole (not shown) can be changed in dimension by a driving element (not shown) driving the mechanism to achieve multi-stage changes in hole size. When the lens assembly4zooms from the wide-angle end (as shown inFIG.17) to the middle end (as shown inFIG.18) and from the middle end (as shown inFIG.18) to the telephoto end (as shown inFIG.19), the variable hole (not shown) of the shading element ST41will change according to the effective focal length of the lens assembly4. The correspondingly change in the size of the variable hole leads to change f-Number.

Among the first lens group LG41, the second lens group LG42, the third lens group LG43, the fourth lens group LG44, and the fifth lens group LG45, the effective optical range is non-circular symmetry for at least one lens, so that the effective optical diameter of the short side direction is different from the effective optical diameter of the long side direction. When the lens assembly4is at the telephoto end, the schematic diagram of the effective optical diameter in the short side direction and long side direction is similar toFIG.6.

The 3-2 lens L47and the 3-3 lens L48of the third lens group LG43can move perpendicular to the axis AX4to achieve optical image stabilization. The fourth lens group LG44can move along the axis AX4to achieve auto focus.

According to the foregoing, wherein: the first side surface S44of the 1-1 lens L41is a concave surface and the second side surface S45of the 1-1 lens L41is a convex surface; the 2-3 lens L45is a biconvex lens, wherein the second side surface S414is a convex surface; the first side surface S424of the 4-1 lens L410is a concave surface and the second side surface S425of the 4-1 lens L410is a convex surface; the first side surface S426of the 5-1 lens L411is a concave surface and the second side surface S427of the 5-1 lens L411is a convex surface; and both of the first side surface S428and second side surface S429of the optical filter OF4are plane surfaces.

With the above design of the lenses, reflective element P4, shading element ST41, stop ST42, and at least one of the conditions (1)-(16) satisfied, the lens assembly4can have an effective shortened total lens length, an effective decreased thickness, an effective increased resolution, an effective increased brightness uniformity, an effective corrected aberration, an effective corrected chromatic aberration, and a realized optical zoom function. The preferred embodiment of the present invention can be achieved when the lens assembly satisfies conditions (1)-(16), refractive power distribution, and surface shape.

Table 10 shows the optical specification of the lens assembly4inFIG.17,FIG.18, andFIG.19when the lens assembly4is at the wide-angle end, middle end, and telephoto end, respectively.

TABLE 10Wide-angle EndEffective FocalF-number = 3.51Length = 9.30 mmTotal LensField of View =Length = 38.04 mm33.234 degreesMiddle EndEffective FocalF-number = 3.81Length = 16.03 mmTotal LensField of View =Length = 38.04 mm18.666 degreesTelephoto EndEffective FocalF-number = 4.05Length = 29.93 mmTotal LensField of View =Length = 38.04 mm9.850 degreesRadiusEffectiveofFocalSurfaceCurvatureThicknessLengthNumber(mm)(mm)NdVd(mm)RemarkS41∞3.21.5264.1P4S42∞3.21.5264.1S43∞0.4S44−32.5230.71.8523.8−57.37L41S45−100.2960.091S468.9752.1991.4984.514.69L42S47−32.0920.324S48∞0.223ST41(Wide-angle End)3.990(Middle End)8.027(Telephoto End)S49306.0390.61.4984.5−12.23L43S4105.8270.864S411−3.6640.51.7449.3−4.01L44S41216.7480.030S41324.5350.9251.931.25.69L45S414−6.3018.186(Wide-angle End)4.419(Middle End)0.382(Telephoto End)S415∞−0.237ST42S41610.5780.6311.4984.521.77L46S417∞0.420S4184.7332.0281.4984.55.32L47S419−4.9030.197S420−5.6750.8451.825.5−10.90L48S421−17.3330.440S42220.1750.3941.8540.4−61.25L49S42314.4180.976(Wide-angle End)2.023(Middle End)0.658(Telephoto End)S424−3.49811.5456.1−8.88L410S425−14.6540.369(Wide-angle End)3.663(Middle End)7.327(Telephoto End)S426−26.2841.4821.6225.916.36L411S427−7.4116.845(Wide-angle End)2.504(Middle End)0.206(Telephoto End)S428∞0.211.5264.2OF4S429∞1.00

The definition of aspheric surface sag z of each aspheric lens in table 10 is the same as that of in Table 1, and is not described here again. In the fourth embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric lens are shown in Table 11.

TABLE 11SurfaceABCNumberkEFGDS4700.000221−8.8E−07−9.59117E−081.40526E−08−9.48901E−103.24631E−11−4.48752E−13S4900.0015650.000132.36937E−062.3947E−05−7.98225E−061.27435E−06−6.38264E−08S41300.0016457.48E−05−0.0001615985.56795E−05−1.78236E−053.05843E−06−2.65627E−07S41400.0012910.000209−9.95551E−052.67469E−05−6.87663E−068.87147E−07−7.80131E−08S41600.0009264.62E−05−3.37781E−057.13428E−06−2.62665E−07−1.13319E−071.20703E−08S41800.0003250.000203−1.3899E−054.20805E−061.37508E−07−9.18866E−089.8263E−09S41900.0055550.000249−0.0001613014.13454E−05−6.04989E−064.50243E−07−1.12331E−08S4210−0.002728.07E−053.88595E−05−1.32997E−06000S4220−0.002060.0002−7.22426E−051.24811E−052.28515E−07−2.79752E−071.45336E−08S42400.016362−0.00113−6.64839E−051.71498E−053.73449E−05−1.52499E−051.67946E−06S42500.009575−0.000597.98215E−05−0.0001245017.15415E−05−1.66526E−051.36619E−06S4260−0.00341−0.000510.000236837−8.43327E−051.79238E−05−2.03211E−069.43004E−08S4270−0.00128−0.000880.000416928−0.0001317062.35598E−05−2.17894E−068.10885E−08

Table 12 shows the parameters and condition values for conditions (1)-(10) in accordance with the lens assembly4of the fourth embodiment. Table 13 shows the parameters and condition values for conditions (11)-(16) in accordance with the lens assembly4of the fourth embodiment at the wide-angle end. Table 14 shows the parameters and condition values for conditions (11)-(16) in accordance with the lens assembly4of the fourth embodiment at the middle end. Table 15 shows the parameters and condition values for conditions (11)-(16) in accordance with the lens assembly4of the fourth embodiment at the telephoto end. It can be seen from Table 12, Table 13, Table 14, and Table 15 that the lens assembly4of the fourth embodiment satisfies the conditions (1)-(16). In order to achieve the preferred embodiment of the present invention, at least one of the conditions (1)-(16) is satisfied.

TABLE 12f119.30mmf2−8.31mmf37.07mmf4−8.88mmf516.36mmDmax8.687mmD1r18.532mmf1/fW2.075f2/fW−0.894f3/fW0.760f4/fW−0.955f5/fW1.759TTL/fW4.090fT/TTL0.787TTL/Dmax4.379fT/D1r13.508

TABLE 13EPA8.835mm2STD5.52 mmEPDX3.43mmEPDY3.048mmPL10.8 mmPH6.4mmEPA/STD1.60mmEPDX/STD0.62EPDY/STD0.55PL/EPDX3.15PH/EPDY2.10EPA/PL0.82mm

TABLE 14EPA25.573mm2STD5.52 mmEPDX5.724mmEPDY5.552mmPL10.8 mmPH6.4mmEPA/STD4.63mmEPDX/STD1.04EPDY/STD1.01PL/EPDX1.89PH/EPDY1.15EPA/PL2.37mm

TABLE 15EPA47.530mm2STD5.52 mmEPDX9.1mmEPDY5.6mmPL10.8 mmPH6.4mmEPA/STD8.61mmEPDX/STD1.65EPDY/STD1.01PL/EPDX1.19PH/EPDY1.14EPA/PL4.40mm

In addition, the lens assembly4of the fourth embodiment can meet the requirements of optical performance as seen inFIGS.20A-20B and21A-21B. It can be seen fromFIG.20Athat the field curvature of tangential direction and sagittal direction in the lens assembly4of the fourth embodiment at the wide-angle end ranges from −0.04 mm to 0.03 mm. It can be seen fromFIG.20Bthat the distortion in the lens assembly4of the fourth embodiment at the wide-angle end ranges from −6% to 0%. It can be seen fromFIG.21Athat the field curvature of tangential direction and sagittal direction in the lens assembly4of the fourth embodiment at the telephoto end ranges from −0.06 mm to 0.04 mm. It can be seen fromFIG.21Bthat the distortion in the lens assembly4of the fourth embodiment at the telephoto end ranges from 0% to 2%. In addition, the field curvature and distortion in the lens assembly4of the fourth embodiment at the middle end can also meet the requirements, and the figures are omitted here. It is obvious that the field curvature and the distortion of the lens assembly4of the fourth embodiment can be corrected effectively. Therefore, the lens assembly4of the fourth embodiment is capable of good optical performance.

In the above embodiment, only one reflective element is disposed between the first side and the first lens group. However, it can be understood that another reflective element can also be added between the first lens group and the fifth lens group, or between the fifth lens group and the second side, that is, one reflective element is disposed between the first side and the first lens group, another reflective element is disposed between the first lens group and the fifth lens group, or between the fifth lens group and the second side. In other words, the reflective element can be disposed between the first side and the second side, and falls into the scope of the invention.

While the invention has been described by way of example and in terms of the preferred embodiment(s), it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.