TWI352821B - Zoom lens - Google Patents

Description

1352821 IX. INSTRUCTIONS: [Technical field to which the invention pertains] ‘and particularly related to a zoom The present invention relates to a “zoom lens”. [Prior Art] With the rapid development of the network and the demand for monitor lenses, the 'high magnification and high quality, lightweight and wide viewing angles are being improved;:: the trend of addition' and the orientation towards small and medium-sized The product is still in the market. The zoom magnification is between 2 and 3.5 times, and thus it has the advantage that it has a relatively high capacity to satisfy the above requirements and a large intervening ratio. Based on the low-cost considerations and two or more than three groups of moving lens groups, the focal lens will use the head to achieve miniaturization. Because of this, the specification of the zoom lens, how to effectively allocate the combination of each group of transmissive materials in a limited space, the ten #录的工作间肩肩 # ^, further with an aspheric lens to eliminate is quite important. For the image quality of the gossip, please refer to Figure 1. The US patented zoom lens is achieved by the relative movement of the mirror group for the purpose of zooming in and zooming out as revealed by G^G :: '552'937. A combination of (U, L2, L3), and a second lens G3 uses a combination of four lenses L5, L6, L7). Further, in the _th lens group & and the group 〇2, an aspherical lens matching m is used to eliminate aberration. The aspherical lens can play a key role in correcting aberrations.

Client^ Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/flnal/Hawdong/Sophia Yang Yang Zhuji 6's aspheric lens is in mass production. If there is no control of the aspheric lens: the difference: to = = the whole The yield is not easy to improve. Moreover, due to non-focal: mirror =; force,: therefore, more aspherical mirrors can also cause; the structure disclosed by variable number No. 6, _ can increase the rate of 9. This - lens group 0!, the second attraction into a shell. In the two groups of lens groups (the first light ray 彳 / | / see Jun fG2 and fixed lens group G3) structure of the zoom sub-, '1 wood, when changing the magnification, the position of the aperture diaphragm 07 also has to move And need a relatively complex mechanism to do the matching = to zoom the mirror. U. In addition, U.S. Patent No. 5,15 5,62 9 The tiger disclosed the lens is a group of two moving lens groups (including seven lenses) to achieve the purpose of reducing the magnification. However, since the aperture of the variable-focus lens is relatively small at two o'clock, it is easy to cause a lack of photosensitivity of the photosensitive member during nighttime and indoor use, and it is difficult to satisfy the requirement that the monitor is produced by the aperture. [Embodiment] The present invention provides a zoom having a small volume, a large aperture, and a wide viewing angle. Other objects and advantages of the present invention can be further understood from the features of the present invention. 1

Client's Docket No.: ΡΤ1052 TTs Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang 扬妃1352821 In order to achieve one or a part or all of the above or other purposes, the zoom lens according to an embodiment of the present invention includes a a first lens group and a second lens group. The refractiVe power of the first lens group and the second lens group are negative and positive, respectively. In addition, the first lens group is composed of a first lens, a second lens and a third lens arranged in sequence from an object side to an image side, and the first lens The diopter of the second lens and the third lens are negative, negative, and positive, respectively. The second lens group is disposed between the first lens group and the image side. The second lens group is composed of a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order from the object side to the image side, and the fourth lens, the fifth lens and the sixth lens The diopter of the seventh lens and the seventh lens are positive, positive, negative, and positive, respectively. Wherein the first lens group and the second lens group are adapted to move between the object side and the image side, and at least one of the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical lens. In an embodiment of the invention, the fourth lens is an aspherical lens. In an embodiment of the invention, the first lens, the second lens and the second lens are respectively a spherical lens. In an embodiment of the invention, the first lens is a convex-concave lens with a convex surface facing the object side, the second lens is a biconcave lens, the third lens is a convex lens with a convex surface facing the object side, and the fourth lens is a lenticular lens. The five lens is a lenticular lens. The sixth lens is a convex-concave lens having a concave surface toward the image side, and the seventh lens is a lenticular lens. In an embodiment of the invention, the zoom lens further includes a light bar fixed between the first lens group and the second lens group.

Client's Docket No.: PT1052 TT s Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yang Zhuo 8 1352821 In the consistent embodiment of the present invention, the above-mentioned zoom lens is 'one-wide' at a wide-end end The ratio of the distortion value of 75% (〇pticaldist〇rti〇n) to the distortion value of 100% of the imaging height is x, and 0 5$χ$0 56. The zoom lens can effectively reduce the aberration and chromatic aberration to achieve wide angle by combining the negative and positive diopter of the first lens group and the second lens group with a small number of aspherical lenses. In addition, during the zooming process, the light barrier is fixed, so the linkage mechanism is relatively simple in design. Thus, the size of the zoom lens can be reduced, and the production cost can be effectively reduced. The above described objects, features and advantages of the present invention will become more apparent from the description of the appended claims. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation. 3D, 3D, and 3C are schematic views showing the configuration of the zoom lens of the present embodiment at different zoom magnifications, wherein the third image shows the structure of the zoom lens at telephoto end (tele-end) Fig. 3D is a schematic view showing the configuration of the zoom lens in the middle position (middle f〇cal length region), and the 3C figure showing the configuration of the zoom lens at the wide-end end. Please refer to FIG. 3A, FIG. 3B and FIG. 3C for the variation of this embodiment.

Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yang 妃1352821 The focal lens 1GG mainly includes - the _ lens group UG and the second lens group 120 the lens group 11 〇 and the second The diopter of the lens group 12〇(4) ρο·) is negatively positive. In addition, the first lens group n〇 is derived from

A first lens m, a second lens 112 and a third lens 113 are arranged in sequence from the object S1de to the lmage side, and the first lens m, L 112 and the third lens 113 are formed. The diopter is negative, negative, and positive. The second lens group 120 is disposed between the first lens group 110 and the image side. The second lens group 12 is composed of a fourth lens 12 - a fifth lens 124 , a sixth lens and a seventh lens 126 which are sequentially arranged from the object side to the image side, and the fourth lens 12 The diopter of the fifth lens 124, the sixth lens 125, and the seventh lens 126 are positive, positive, negative, and positive, respectively. Wherein the 'first lens group 110 and the second lens 12 group are adapted to move between the object side and the image side, and at least one of the fourth lens 121, the fifth lens 124, the sixth lens 125, and the seventh lens 126 It is an aspherical lens. In the present embodiment, the fourth lens 121 is an aspherical lens as an example. In the above-described zoom lens 100, the first lens lu, the second lens 112, and the third lens 113 are, for example, spherical lenses, respectively. In the present embodiment, the first lens 111 is a convex-concave lens having a convex surface facing the object side, the second lens 112 is a biconcave lens, the second lens 1丨3 is a meniscus lens having a convex surface facing the object side, and the fourth lens 121 is a lenticular lens. The fifth lens 124 is a lenticular lens, the sixth lens 125 is a convex-concave lens having a concave surface toward the image side, and the seventh lens 丨 26 is a lenticular lens. In addition, the zoom lens 100 further includes a light barrier 13 〇 fixed between the first lens group 110 and the second lens group 12 ,, which can be operated according to actual needs.

Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawd〇ng/s〇phia Yang 妃 a 10 To adjust the zoom lens 100, the adjustment of the zoom lens of this embodiment determines the full-close end of the wide-angle end. . The aperture size (or the amount of incident light). For example, the size of the aperture of the first one can be changed by the aperture 130 from F/1, 6 and the telephoto end from F/3 3 to the end as described above, using six pieces of yello, which are not mirrored by optical diopter. An aspherical lens, with 120 (four) joints, the real lens group 110 and the second lens group difference Κ 'the zoom lens 10G can eliminate the aberration disc chromatic aberration and the effect of the cross-cutting and wide angle. Poor color implementation: Among the 'when the zoom lens 100 changes the magnification, the first moving mirror f·110 and the second transparent 11?Λ A τ brother when the zoom lens magnification” / relative movement. For example , the magnification is from the telephoto end (such as 3A =:, :: that is, when the zoom lens 100 is shown) or from the middle to the middle position (as in Figure 3B & and the wide-angle end (as in Figure 3C) First)

When the magnification of the head 100 that the second lens group 120 is moved toward the direction away from each other becomes larger, that is, when the zoom lens 100 is doubled: the wide-angle end becomes the intermediate position or the intermediate position becomes the telephoto end 2 The lens group 110 and the second lens fresh 120 move in a direction in which they approach each other. In particular, regardless of the relative movement of the first lens group 11G and the second lens group 120 (or during the zoom lens just changing the focal length), the position of the light barrier 130 remains fixed. As described above, the complicated mechanism for driving the light interception can be omitted, thereby facilitating the miniaturization of the zoom lens and reducing the manufacturing cost thereof. In addition, the zoom lens 1 of the present embodiment can achieve a long view by slightly reducing the aperture when the magnification is from 1 to 27 times.

Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/final/Hawdong/Sophia Yang Yang 妃 11 1352821 : (d:^leld) characteristics, that is, 'when shooting objects of different distances, 11Q M line focusing action The first lens group is controlled by the mechanism, and the zoom lens 100 of the present embodiment is premised on a large sensor (9) at the time of design. However, even with a smaller component, the zoom lens disclosed in the embodiment of the present invention can provide a good viewing range.

In addition, in the zoom lens 100 of the present embodiment, when the zoom lens is at a ratio of 75% of the angular distortion of the image to the south of the image, the ratio of the distortion of the image is 100%, and the ratio of the distortion is 100. And 〇5$χ$〇56. The following will describe a preferred embodiment of the zoom lens 100. However, the data listed in <Table 1>, <Table 2>, and <Table 3> below are not intended to limit the present invention, and any of them are familiar with this. Those skilled in the art will be able to make appropriate changes to their parameters or settings after reference to the present invention, which are still within the scope of the present invention. <Table 1> Surface Curvature radius (mm) Spacing (mm) Refractive index Dispersion value Remarks SI 25.00000 0.850000 1.7292 54.7 First lens S2 6.23000 3.900000 S3 -17.58000 0.800000 1.6230 58.2 Second lens

Client's Docket No·: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yangzhu妃 12 1352821 S4 30.43000 0.300000 S5 15.21000 1.750000 1.847 23.8 Third lens S6 66.47000 Variable pitch dl S7 Infinite variable pitch d2 Light shed S8 8.84000 2.550000 1.5891 61.2 Fourth lens S9 -28.62000 0.190000 S10 9.08000 2.630000 1.497 81.5 Fifth lens S11 -30.49000 0.220000 S12 20.58000 0.800000 1.847 23.8 Sixth lens S13 5.22000 1.910000 S14 12.88000 3.000000 1.580 40.8 Seventh lens S15 -87.14000 Variable pitch d3 S16 Infinity 2.500000 1.517 64.1 Low Pass Filter S17 Infinite 0.811000 S18 Infinity 〇. 〇〇〇〇〇〇 Photosensitive Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yang Zhujing 13 1352821 S8 and S9 can be expressed by the following formula: X = ITVhukPTrF+AH4+bh6 + ch8 + dh,° where X is the offset of the optical axis direction. R is the radius of the 〇sculating sphere, that is, the radius of curvature near the optical axis (such as the radius of curvature of S8 and S9 in <Table 1>). Η is the aspherical height, which is the height from the center of the lens to the edge of the lens. From the formula, different Η will correspond to different X values. In this design, 'Κ=〇, and A, Β, C, and D are aspheric coefficients. The aspherical coefficients of S8 and S9 are as shown in the following Table 2. <Table 2> Surface A Β CD S8 -0.302196E-03 0.163394Ε-05 0.670984E-07 -0.331064E-08 S9 0.165428E-03 0.108694Ε-05 0.182067E-06 -0.544554E-08 In <Table 1> Medium 'curvature radius (mm) means the curvature of each surface half

The diameter and the pitch (mm) refer to the distance between two adjacent surfaces. For example, the distance between the surfaces S1 refers to the distance between the surface S1 and the surface S2. For the thickness, refractive index and dispersion value of each lens in the remarks, please refer to the values of the refractive index and the absolute value of the Abbe number in the same column. In addition, in Table 1, the surfaces S1 and S2 are respectively separated from the first and second sides of the first lens 112, and the surfaces S3 and S4 are respectively the surface S5. The second lens 112 is away from and adjacent to the third lens. The two surfaces of 113, the table and S6 are respectively the third lens 113 away from and adjacent to the fourth lens 121

Client's Docket No.: PT1052 TT, s Docket No: 9009C-A41369TW/final/Hawdong/Sophia Yang Yang Zhu妃 14 1352821 face, surface S7 is the surface of the light bar 13〇 that controls the amount of incident light, and the surfaces S8 and S9 are the fourth lens respectively. The surfaces S10 and S11 are away from and adjacent to the two surfaces of the fifth lens 124. The surfaces S10 and S11 are respectively away from and adjacent to the two surfaces of the sixth lens 125. The surfaces S12 and S13 are respectively away from the sixth lens 125 and adjacent to the seventh lens 126. The two surfaces, the surfaces S14 and S15 are respectively the second lens 126 away from and adjacent to the two surfaces of the low-pass filter 14, and the surfaces S16 and S17 are respectively the low-pass filter 140 away from and adjacent to the two surfaces of the photosensitive element 105 and the surface S18 It is the surface of the photosensitive member 1〇5. In the present embodiment, when the zoom lens 100 is used for image pickup, a photosensitive element 105 such as a charge coupled device (CCD) or a CMOS image sensing element is disposed on the image side. When the zoom lens 300 is used for projection, the image side may be provided with a light valve such as a digital micro-mirror deivce or a liquid crystal on silicon panel (LCOS panel). <Table 3> Wide-angle end intermediate position Telephoto effective focal length (EFL) 3.7mm 5.5 mm 12 mm Field of view (FOV) 97.6° 62.6° 28.4° F value (F/#) 1.6 1.8 \ 3.3 Variable pitch (mm) Dl 12 mm 4.87 mm Variable pitch (mm) d2 9.48 mm 7.62 mm d3 2.3 mm 5.16 mm List the zoom lens 100 at the wide-angle end and the middle in <Table 3>

Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/final/Hawdong/Sophia Yang Yang 妃1352821 Some important parameter values at the position and telephoto end, including effective focal length (EFL), field of view ( F〇v), F value (F/#) and variable spacing dl, d2, d3. Since the F-number of the zoom lens 100 of the present embodiment can be as small as 1.6, there is an advantage that the aperture is large. In addition, the zoom lens 1 has an angle of view of up to 97 degrees at the wide-angle end, so it has the advantage of wide angle. 4A, 4B, and 4C are imaging optical simulation data maps of the zoom lens 100 corresponding to FIGS. 3A, 3B, and 3C, respectively. The eye 4A, 4B, and 4C, due to the longitudinal spherical aberration, distortion, astigmatism field curves, or lateral chromatic aberration (iater c〇l〇r) Both are within the standard range, so the zoom lens 100 has good optical quality. It is worth noting that due to the reversible principle of light, those skilled in the art can also make appropriate adjustments to the aforementioned parameters, so that the zoom lens of the present invention is suitable for use in a monitor product, but it should still fall within the scope of the present invention. Inside. In summary, the zoom lens disclosed in the embodiment of the present invention can effectively reduce the aberration and chromatic aberration by combining the diopter of the first lens group and the second lens group with a negative and positive combination with a small aspherical lens. To achieve the purpose of wide angle and large aperture. In addition, during the zooming process, the light barrier is fixed, so the linkage mechanism is relatively simple in design. Thus, the size of the zoom lens can be reduced, and the production cost can be effectively reduced. Even when photosensitive elements of different sizes are applied, there is no shortage of viewing angles. However, the above is only the preferred embodiment of the present invention, when not

Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yang Zhuji 1352881 can limit the scope of implementation of the present invention, that is, the simple equivalent of the patent scope and the description of the invention according to the present invention. Variations and modifications are still within the scope of the invention. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS: Fig. 1 is a schematic view showing the construction of a conventional zoom lens; Fig. 2 is a view showing the construction of another conventional zoom lens; Fig. 3A is a view showing an embodiment of the present invention FIG. 3B is a schematic structural view showing a zoom lens according to an embodiment of the present invention in an intermediate position; and FIG. 3C is a view showing a zoom lens according to an embodiment of the present invention at a wide angle end; FIG. 4A is a simulation diagram of imaging optical data corresponding to the zoom lens of FIG. 3A; FIG. 4B is a simulation diagram of imaging optical data corresponding to the zoom lens of FIG. 3B; and FIG. 4C shows corresponding correspondence Imaging optical data simulation of the zoom lens of 3C.

Client’s Docket No.: PT1052 TT’s Docket No: 9009C-A41369TW/fmal/Hawdong/Sophia Yang Yang Zhuyu 1352821 [Main component symbol description]

Gi to first lens group G2 to second lens group G3 to fixed lens group L1, L2, L3, L4, L5, L6, L7 to lens 07 to aperture stop 100 to zoom lens 105 to photosensitive element 110 to first lens Group 111 to first lens 112 to second lens 113 to third lens 120 to second lens group 121 to fourth lens 124 to fifth lens 125 to sixth lens 126 to seventh lens 130 to light receiver 140 to low pass filter

S11, SI, S2, S3, S4, S5, S6, S7, S8, S9, S10, S12, S13, S14, S15, S16, S17, S18~ surface

Client’s Docket No.: PT1052 TT’s Docket No: 9009C-A41369TW/flnal/Hawdong/Sophia Yang 妃 妃 18

Claims (1)

1352821 X. Patent Application Range: 1. A zoom lens comprising: a first lens group having a negative refracting power, the first lens group being a first lens sequentially arranged from an object side to an image side; a second lens and a third lens, wherein the diopter of the first lens, the second lens, and the third lens are negative, negative, and positive, respectively; and a second lens group disposed on the first lens group Between the image side and the positive refracting power, the second lens group is a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side. The diopter of the fourth lens, the fifth lens, the sixth lens, and the seventh lens are positive, positive, negative, and positive, respectively, wherein the first lens group and the second lens group are adapted Moving between the object side and the image side, and at least one of the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical lens. 2. The zoom lens of claim 1, wherein the fourth lens is an aspherical lens. 3. The zoom lens of claim 1, wherein the first lens, the second lens, and the third lens are each a spherical lens. 4. The zoom lens of claim 1, wherein the first lens is a convex-concave lens having a convex surface facing the object side, and the second lens is a double concave lens, the third lens is a convex surface facing the convex lens The convex lens of the object side, the fourth lens is a lenticular lens, the fifth lens is a lenticular lens, and the sixth lens is a convex-concave lens having a concave surface facing the image side, and the seventh lens is a lenticular lens. Client's Docket No.: PT1052 TT's Docket No: 9009C-A41369TW/fmal/Hawdong/Sopliia Yang Yang Zhuji 19 1352821 5. The zoom lens according to claim 1, further comprising a light barrier fixed to the first Between the lens group and the second lens group. 6. The zoom lens according to claim 1, wherein when the zoom lens is at a wide-angle end, a ratio of an optical distortion of 75% of the imaging height to a distortion value of the imaging height of 100% is X, and 0.5 S 0.56. Client’s Docket No·: PT1052 TT’s Docket No: 9009C-A41369TW/final/Hawdong/Sophia Yang