Zoom lens

Abstract

The invention provides a zoom lens. The zoom lens sequentially comprises a first lens, a first prism, a lens group and a second prism from an object side to an image side along an optical axis, the lens group includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Each of the first to eighth lenses includes an object side surface and an image side surface through which imaging light passes. The zoom lens has eight lenses with diopters, and the diopters of the first to eighth lenses are respectively positive, positive, negative, positive, negative, positive, positive and negative.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical system, and more particularly to a zoom lens. BACKGROUND

[0002] Zoom lenses with a wide focal length range are favored by consumers. How to improve the imaging quality of zoom lenses is an important issue. SUMMARY

[0003] The present application provides a zoom lens with good imaging quality.

[0004] According to an embodiment of the present application, a zoom lens is provided, which sequentially includes a first lens, a first prism, a lens group, and a second prism along an optical axis from an object side to an image side. The lens group sequentially includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along the optical axis from the object side to the image side. The first lens to the eighth lens each include an object side surface facing the object side and passing imaging light, and an image side surface facing the image side and passing imaging light. The zoom lens has a total of eight lenses with refractive powers, and the refractive powers of the first lens to the eighth lens are positive, positive, negative, positive, negative, positive, positive, and negative, respectively.

[0005] Based on the above, the zoom lens provided by the embodiments of the present application has good imaging quality in both the telephoto mode and the wide-angle mode.

[0006] In order to make the above features and advantages of the present application more obvious and easy to understand, the following embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0007] FIG. 1A A schematic diagram of a zoom lens according to a first embodiment of the present application in a wide-angle mode and with an infinite focal length is shown;

[0008] FIG. 1B A schematic diagram of a zoom lens according to a first embodiment of the present application in a telephoto mode and with an infinite focal length is shown;

[0009] FIG. 1C A schematic diagram of a zoom lens according to a first embodiment of the present application in a wide-angle mode and with a focal length of 1 meter is shown;

[0010] FIG. 1D A schematic diagram of a zoom lens according to a first embodiment of the present application in a telephoto mode and with a focal length of 0.2 meters is shown;

[0011] FIG. 2A A curve diagram of the field curvature aberration in the tangential direction when light is incident on the zoom lens shown; FIG. 1A A curve diagram of the field curvature aberration in the tangential direction when light is incident on the zoom lens shown;FIG. 2B shows a curve graph of the field curvature aberration in the sagittal direction when light rays are incident FIG. 1A on the zoom lens shown; FIG. 2C shows a curve graph of the distortion when light rays are incident FIG. 1A on the zoom lens shown;

[0012] FIG. 3A shows a curve graph of the field curvature aberration in the tangential direction when light rays are incident FIG. 1B on the zoom lens shown; FIG. 3B shows a curve graph of the field curvature aberration in the sagittal direction when light rays are incident FIG. 1B on the zoom lens shown; FIG. 3C shows a curve graph of the distortion when light rays are incident FIG. 1B on the zoom lens shown;

[0013] FIG. 4A shows a curve graph of the field curvature aberration in the tangential direction when light rays are incident FIG. 1C on the zoom lens shown; FIG. 4B shows a curve graph of the field curvature aberration in the sagittal direction when light rays are incident FIG. 1C on the zoom lens shown; FIG. 4C shows a curve graph of the distortion when light rays are incident FIG. 1C on the zoom lens shown;

[0014] FIG. 5A shows a curve graph of the field curvature aberration in the tangential direction when light rays are incident FIG. 1D on the zoom lens shown; FIG. 5B shows a curve graph of the field curvature aberration in the sagittal direction when light rays are incident FIG. 1D on the zoom lens shown; FIG. 5C shows a curve graph of the distortion when light rays are incident FIG. 1D on the zoom lens shown;

[0015] FIG. 6A shows a schematic view of a zoom lens according to a second embodiment of the present application in a wide-angle mode and at an infinite focus;

[0016] FIG. 6B shows a schematic view of a zoom lens according to a second embodiment of the present application in a telephoto mode and at an infinite focus;

[0017] FIG. 6CA schematic diagram showing a zoom lens according to a second embodiment of the present invention in wide-angle mode with a focal length of 1 meter is shown.

[0018] FIG. 6D A schematic diagram is shown of a zoom lens according to a second embodiment of the present invention in telephoto mode with a focal length of 0.2 meters;

[0019] FIG. 7A It shows when light is incident FIG. 6A The diagram shows the field curvature aberration curve in the meridional direction when using a zoom lens. FIG. 7B It shows when light is incident FIG. 6A The diagram shows the field curvature aberration curve in the sagittal direction when using a zoom lens. FIG. 7C It shows when light is incident FIG. 6A The graph shows the distortion curve when using a zoom lens.

[0020] FIG. 8A It shows when light is incident FIG. 6B The diagram shows the field curvature aberration curve in the meridional direction when using a zoom lens. FIG. 8B It shows when light is incident FIG. 6B The diagram shows the field curvature aberration curve in the sagittal direction when using a zoom lens. FIG. 8C It shows when light is incident FIG. 6B The graph shows the distortion curve when using a zoom lens.

[0021] FIG. 9A It shows when light is incident FIG. 6C The diagram shows the field curvature aberration curve in the meridional direction when using a zoom lens. FIG. 9B It shows when light is incident FIG. 6C The diagram shows the field curvature aberration curve in the sagittal direction when using a zoom lens. FIG. 9C It shows when light is incident FIG. 6C The graph shows the distortion curve when using a zoom lens.

[0022] FIG. 10A It shows when light is incident FIG. 6D The diagram shows the field curvature aberration curve in the meridional direction when using a zoom lens. FIG. 10B It shows when light is incident FIG. 6D The diagram shows the field curvature aberration curve in the sagittal direction when using a zoom lens. FIG. 10CIt shows when light is incident FIG. 6D The graph shows the distortion curve when using a zoom lens.

[0023] Explanation of icon numbers

[0024] 0: Aperture

[0025] 1, 2, 3, 4, 5, 6, 7, 8: Lenses

[0026] 10: Zoom lens

[0027] 15, 25, 35, 45, 55, 65, 75, 85: Side view of the object

[0028] 16, 26, 36, 46, 56, 66, 76, 86: side view

[0029] CF: Filter

[0030] C1: Light-receiving surface

[0031] C2: Light-emitting surface

[0032] LS: Lens Group

[0033] LS1: First lens group

[0034] LS2: Second lens group

[0035] P1, P2: Prisms

[0036] S1, S4: Light-receiving surface

[0037] S3, S6, S7: Light-emitting surface

[0038] S2, S5, S8: Reflecting surfaces

[0039] 99: Imaging plane

[0040] A1, A2: Direction Detailed Implementation

[0041] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0042] In the embodiments provided by the present invention, at least one lens surface has a transition point, wherein the transition point is a point located on the lens surface, and the tangent of the point is perpendicular to the optical axis I. When the lens surface has a transition point, the range from the center point of the lens surface to the transition point is defined as the optical axis region, wherein the optical axis region includes the center point. The region radially outward from the transition point to the optical boundary is the circumferential region.

[0043] Reference FIGS. 1A-1D ,inFIG. 1A Fig. 2 shows a schematic view of the zoom lens according to the first embodiment of the present application in the wide-angle mode and at a focal length of infinity, FIG. 1B Fig. 3 shows a schematic view of the zoom lens according to the first embodiment of the present application in the telephoto mode and at a focal length of infinity, FIG. 1C Fig. 4 shows a schematic view of the zoom lens according to the first embodiment of the present application in the wide-angle mode and at a focal length of 1 m, FIG. 1D Fig. 5 shows a schematic view of the zoom lens according to the first embodiment of the present application in the telephoto mode and at a focal length of 0.2 m.

[0044] The zoom lens 10 comprises, in order from the object side toward the image side along the optical axis I, an aperture 0, a lens 1, a prism Pl, a lens group LS, a prism P2, and a filter CF, wherein the lens group LS comprises, in order from the object side toward the image side along the optical axis I, a lens 2, a lens 3, a lens 4, a lens 5, a lens 6, a lens 7, and a lens 8. The object side described above is in the positive direction of the direction Al with respect to the zoom lens 10, and the image side is in the positive direction of the direction A2 with respect to the zoom lens 10.

[0045] The lens 1, the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 each have an object side surface 15, 25, 35, 45, 55, 65, 75, 85 through which an imaging light ray passes, and an image side surface 16, 26, 36, 46, 56, 66, 76, 86 through which the imaging light ray passes. The prism Pl includes an entrance surface Sl, an exit surface S3, and a reflecting surface S2. The prism P2 includes an entrance surface S4, an exit surface S6, and a reflecting surface S5. The optical axis I is bent on the reflecting surface S2 of the prism Pl, and is bent on the reflecting surface S5 of the prism P2. A light ray can enter the prism Pl from the entrance surface Sl of the prism Pl, be reflected by the reflecting surface S2, and exit the prism Pl from the exit surface S3. Similarly, a light ray can enter the prism P2 from the entrance surface S4 of the prism P2, be reflected by the reflecting surface S5, and exit the prism P2 from the exit surface S6. The filter CF is used to pass light rays having a proper wavelength and to filter out a wavelength band that needs to be filtered out (for example, an infrared wavelength band).

[0046] When a light ray is emitted from an object to be imaged, the light ray penetrates the lens 1, enters the prism Pl from the entrance surface Sl of the prism Pl, is reflected on the reflecting surface S2 of the prism Pl, exits the prism Pl from the exit surface S3 of the prism Pl, penetrates the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 in order, enters the prism P2 from the entrance surface S4 of the prism P2, is reflected on the reflecting surface S5 of the prism P2, exits the prism P2 from the exit surface S6 of the prism P2, penetrates the filter CF, and forms an image on the imaging surface 99.

[0047] Lens 1 has positive refractive power, the optical axis area of the object side surface 15 is convex and spherical, the circumferential area of the object side surface 15 is convex, and the image side surface 16 is flat and directly glued on the light entrance surface S1 of the prism P1, reducing the assembly tolerance.

[0048] Lens 2 has positive refractive power, the optical axis area of the object side surface 25 is convex and aspherical, the circumferential area of the object side surface 25 is concave, and the optical axis area of the image side surface 26 is concave and aspherical, and the circumferential area of the image side surface 26 is concave.

[0049] Lens 3 has negative refractive power, the optical axis area of the object side surface 35 is convex and aspherical, the circumferential area of the object side surface 35 is convex, the optical axis area of the image side surface 36 is concave and aspherical, and the circumferential area of the image side surface 36 is concave.

[0050] Lens 4 has positive refractive power, the optical axis area of the object side surface 45 is convex and aspherical, the circumferential area of the object side surface 45 is convex, the optical axis area of the image side surface 46 is convex and aspherical, and the circumferential area of the image side surface 46 is convex.

[0051] Lens 5 has negative refractive power, the optical axis area of the object side surface 55 is convex and aspherical, the circumferential area of the object side surface 55 is convex, the optical axis area of the image side surface 56 is concave and aspherical, and the circumferential area of the image side surface 56 is concave.

[0052] Lens 6 has positive refractive power, the optical axis area of the object side surface 65 is convex and aspherical, the circumferential area of the object side surface 65 is convex, the optical axis area of the image side surface 66 is convex and aspherical, and the circumferential area of the image side surface 66 is concave.

[0053] Lens 7 has positive refractive power, the optical axis area of the object side surface 75 is concave and aspherical, the circumferential area of the object side surface 75 is convex, the optical axis area of the image side surface 76 is convex and aspherical, and the circumferential area of the image side surface 76 is concave.

[0054] Lens 8 has negative refractive power, the optical axis area of the object side surface 85 is convex and aspherical, the circumferential area of the object side surface 85 is convex, the optical axis area of the image side surface 86 is concave and aspherical, and the circumferential area of the image side surface 86 is concave.

[0055] Further, the lens 4, the lens 5 and the lens 6 constitute a first lens group LS1, and the lens 7 and the lens 8 constitute a second lens group LS2, wherein the first lens group LS1 has positive refractive power, and the second lens group LS2 has negative refractive power. According to some embodiments of the present application, the ratio of the focal length of the second lens group LS2 to the focal length of the first lens group LS1 falls between 1.0 and 1.5. As FIGS. 1A-1DAs shown, the zoom lens 10 of the first embodiment zooms by moving the first lens group LS1 and / or the second lens group LS2, the lenses 4, 5 and 6 in the first lens group LS1 do not move relative to each other, and the lenses 7 and 8 in the second lens group LS2 do not move relative to each other. By the modular first lens group LS1 and the second lens group LS2, the stability of the optical performance is improved. Furthermore, the lenses 1, the prism PI, the lenses 2, 3, the prism P2 and the filter CF do not move relative to each other during focusing of the zoom lens 10.

[0056] When the first lens group LS1 and the second lens group LS2 are moved simultaneously, the field of view can be changed. When the second lens group LS2 is moved alone, the focal length can be changed. As shown in FIG. 1A and FIG. 1C As shown, in the wide angle mode, FIG. 1C the distance between the second lens group LS2 and the prism P2 (1.000 mm) is larger than FIG. 1A the distance between the second lens group LS2 and the prism P2 (1.131 mm) is smaller than FIG. 1B and FIG. 1D As shown, in the telephoto mode, FIG. 1D the distance between the second lens group LS2 and the prism P2 (5.926 mm) is larger than FIG. 1B the distance between the second lens group LS2 and the prism P2 (6.641 mm) is smaller than

[0057] Further detailed optical data of the first embodiment are shown in Table 1.

[0058] Table 1:

[0059]

[0060] In Table 1, the radius of curvature of the lens 1, the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 means the radius of curvature of each lens in the region of the optical axis I. The interval of the object side surface 15 (0.640 mm in Table 1) is the thickness of the lens 1 in the optical axis I. The interval of the image side surface 16 (0.000 mm in Table 1) is the distance between the image side surface 16 and the light entrance surface S1 of the prism Pl in the optical axis I. That is, the lens 1 is directly bonded to the prism Pl. The interval of the light entrance surface S1 of the prism Pl (6.200 mm in Table 1) is the total length of the optical axis I inside the prism Pl. The interval of the light exit surface S3 (0.100 mm in Table 1) is the distance between the light exit surface S3 of the prism Pl and the object side surface 25 of the lens 2 in the optical axis I, that is, the gap between the prism Pl and the lens 2 in the optical axis I, and so on. The interval of the object side surface 25 (0.552 mm in Table 1) is the thickness of the lens 2 in the optical axis I, and so on. The interval of the light entrance surface S4 of the prism P2 (6.200 mm in Table 1) is the total length of the optical axis I inside the prism P2.

[0061] Since the zoom lens 10 of the present first embodiment can be zoomed by moving the first lens group LS1 and / or the second lens group LS2, the values dO, d9, d15, and d19 in Table 1 are variable, where the value dO corresponds to the distance between the object and the object side surface 15 in the optical axis I, the value d9 corresponds to the gap between the lens 3 and the lens 4 in the optical axis I, the value d15 corresponds to the gap between the lens 6 and the lens 7 in the optical axis I, and the value d19 corresponds to the gap between the lens 8 and the prism P2 in the optical axis I. The values of the above variable values in the state one, the state two, the state three, and the state four are shown in Table 2, where the state one, the state two, the state three, and the state four respectively mean the states shown in Figs. 1, 2, 3, and 4. FIG. 1A FIG. 1B FIG. 1C FIG. 1D

[0062] Table 2:

[0063] State One State Two State Three State Four d0 Infinity Infinity 1000.00 200.00 d9 4.335 0.149 4.335 0.149 d15 1.577 0.252 1.707 0.967 d19 1.131 6.641 1.000 5.926

[0064] In the present embodiment, the object side surfaces 25, 35, 45, 55, 65, 75, 85 and the image side surfaces 26, 36, 46, 56, 66, 76, 86 are all aspherical surfaces, and these aspherical surfaces are defined by the following equation (1):

[0065]

[0066] Y: distance between a point on the aspherical curve and the optical axis;

[0067] ​​​​Z: depth of asphere, i.e. the perpendicular distance between a point on the asphere with a distance Y from the optical axis and the tangent plane at the vertex of the asphere;

[0068] R: radius of curvature of the lens surface;

[0069] K: conic constant;

[0070] a 2i : asphericity coefficient of the 2i-th order.

[0071] The conic constant K and the asphericity coefficients in the above asphericity formula (1) are shown in Table 3. In Table 3, No. 25 represents the object side surface 25 of the lens 2, No. 26 represents the image side surface 26 of the lens 2, and so on.

[0072] Table 3:

[0073] Face K [a4] [a6] [a8] 25 0 -5.510135E-02 -1.686556E-01 3.850795E-01 26 0 -1.514905E-02 9.427361E-02 2.601508E-01 35 0 -2.374995E-01 8.836513E-01 -1.357390E+00 36 0 -3.176123E-01 6.140327E-01 -1.199487E+00 45 0 -2.889066E-02 9.126235E-02 -1.169969E-01 46 0 9.154706E-02 -5.818343E-01 8.731735E-01 55 0 3.533417E-01 -2.152531E+00 4.880407E+00 56 0 3.201744E-01 -2.112101E+00 4.713110E+00 65 0 7.366907E-02 -1.540621E+00 3.689314E+00 66 0 4.737250E-02 6.900684E-03 -1.194255E-01 75 0 4.052785E-01 -3.241941E-01 6.558537E-01 76 0 5.557009E-01 -7.608737E-01 1.625032E+00 85 0 -4.172038E-01 3.902447E-01 8.154375E-02 86 0 -8.531921E-01 1.501237E+00 -2.361021E+00 Face a 10 ]]> a 12 ]]> a 14 ]]> a 16 ]]> 25 -6.801160E-01 3.591817E-01 3.942585E-02 -5.307114E-02 26 -3.790550E-01 -1.954841E-01 4.735733E-01 -1.844070E-01 35 2.035667E+00 -2.037197E+00 1.135301E+00 -2.717581E-01 36 1.685025E+00 -1.505296E+00 7.957521E-01 -1.864449E-01 45 -1.280201E-01 3.858259E-01 -3.123389E-01 7.871133E-02 46 -1.833564E-01 -6.937769E-01 5.936868E-01 -1.459861E-01 55 -5.436718E+00 3.051006E+00 -7.498549E-01 4.487729E-02 56 -4.917835E+00 2.319065E+00 -2.660623E-01 -7.642582E-02 65 -3.384255E+00 1.577514E-01 1.520020E+00 -6.357108E-01 66 4.563852E-01 -6.950737E-01 4.971814E-01 -1.306751E-01 75 -7.869446E-01 4.789838E-01 2.707555E-02 -8.218844E-02 76 -2.373012E+00 2.099949E+00 -9.132343E-01 1.757057E-01 85 -1.156393E+00 1.837179E+00 -1.289449E+00 3.567857E-01 86 2.744504E+00 -2.097648E+00 8.864993E-01 -1.490042E-01

[0074] Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIGS. 2A-2C , FIG. 2A Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 1A Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 2B Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 1A Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 2C Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 1A Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 2A Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 2B Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIG. 2C Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10,

[0075] Referring to FIGS. 13A, 13B, 13C, 13D and 13E, the field curvature aberration curves in the tangential direction of the zoom lens 10 shown in FIG. 12A are shown when light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10, FIGS. 3A-3C , FIG. 3AFigures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1B Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 3B Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1B Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 3C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1B Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 3A Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 3B Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 3C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A,

[0076] Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIGS. 4A-4C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4A Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4B Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4C Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 1C Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4A Figures 7A, 7B, 7C, 7D and 7E show the curves of the field curvature aberration in the sagittal direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4B Figures 6A, 6B, 6C, 6D and 6E show the curves of the field curvature aberration in the tangential direction when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, are incident on the zoom lens 10 shown in Figure 1A, FIG. 4CAs shown in the distortion curve, the distortion aberration of the five representative wavelengths is less than ±0.3% across the entire field of view, indicating that the zoom lens 10 of this first embodiment has good imaging quality in wide-angle mode with a focal length of 1 meter.

[0077] See also FIGS. 5A-5C , FIG. 5A This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 1D The diagram shown is a field curvature aberration curve in the meridional direction when using zoom lens 10. FIG. 5B This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 1D The diagram shows the field curvature aberration curve in the sagittal direction when using zoom lens 10. FIG. 5C This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 1D The distortion curve shown is for zoom lens 10. FIG. 5A as well as FIG. 5B As shown in the field curvature aberration curve, the field curvature aberration of the five representative wavelengths falls within ±0.10mm across the entire field of view, indicating that the zoom lens 10 of this first embodiment can effectively eliminate field curvature aberration in telephoto mode with a focal length of 0.2 meters. FIG. 5C As shown in the distortion curve, the distortion aberration of the five representative wavelengths is less than ±2.0% across the entire field of view, indicating that the zoom lens 10 of this first embodiment has good imaging quality in telephoto mode with a focal length of 0.2 meters.

[0078] To fully illustrate the various embodiments of the present invention, other embodiments will be described below. It must be noted that the following embodiments use the same element reference numerals and some content as those in the foregoing embodiments, with the same reference numerals representing the same or similar elements, and descriptions of identical technical content omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0079] Reference FIGS. 6A-6D ,in FIG. 6A A schematic diagram is shown of a zoom lens according to a second embodiment of the present invention in wide-angle mode with a focal length of infinity. FIG. 6B A schematic diagram is shown of a zoom lens according to a second embodiment of the present invention in telephoto mode with a focal length of infinity. FIG. 6C This diagram illustrates a zoom lens according to a second embodiment of the present invention in wide-angle mode with a focal length of 1 meter. FIG. 6DFig. 2 shows a schematic view of the zoom lens according to the second embodiment of the present application in the telephoto mode and at a focal length of 0.2 m.

[0080] The zoom lens 10 comprises, in order from the object side toward the image side along the optical axis I, an aperture 0, a lens 1, a prism Pl, a lens group LS, a prism P2, and a filter CF, wherein the lens group LS comprises, in order from the object side toward the image side along the optical axis I, a lens 2, a lens 3, a lens 4, a lens 5, a lens 6, a lens 7, and a lens 8. The object side described above is with respect to the zoom lens 10 in the positive direction of the direction Al, and the image side is with respect to the zoom lens 10 in the positive direction of the direction A2.

[0081] The lens 1, the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 each have an object side surface 15, 25, 35, 45, 55, 65, 75, 85 through which an imaging light ray passes, and an image side surface 16, 26, 36, 46, 56, 66, 76, 86 through which the imaging light ray passes. The prism Pl comprises an entrance surface Sl, an exit surface S3, and a reflecting surface S2. The prism P2 comprises an entrance surface S4, an exit surface S7, a reflecting surface S5, and a reflecting surface S8. The optical axis I is bent on the reflecting surface S2 of the prism Pl, and is bent on the reflecting surface S5 and the reflecting surface S8 of the prism P2. A light ray can enter the prism Pl from the entrance surface Sl of the prism Pl, be reflected by the reflecting surface S2, and exit the prism Pl from the exit surface S3. Similarly, a light ray can enter the prism P2 from the entrance surface S4 of the prism P2, be reflected by the reflecting surface S5 and the reflecting surface S8, and exit the prism P2 from the exit surface S7.

[0082] When a light ray is emitted from an object to be imaged, the light ray penetrates the lens 1, enters the prism Pl from the entrance surface Sl of the prism Pl, is reflected on the reflecting surface S2 of the prism Pl, exits the prism Pl from the exit surface S3 of the prism Pl, penetrates the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 in order, enters the prism P2 from the entrance surface S4 of the prism P2, is reflected on the reflecting surface S5 and the reflecting surface S8 of the prism P2, exits the prism P2 from the exit surface S7 of the prism P2, penetrates the filter CF, and forms an image on the imaging surface 99.

[0083] The lens 1 has a positive refractive power, the optical axis region of the object side surface 15 is convex and spherical, and the circumferential region of the object side surface 15 is convex. The image side surface 16 is planar and is directly cemented to the entrance surface Sl of the prism Pl.

[0084] The lens 2 has a positive refractive power, the optical axis region of the object side surface 25 is convex and aspherical, the circumferential region of the object side surface 25 is concave, the optical axis region of the image side surface 26 is concave and aspherical, and the circumferential region of the image side surface 26 is convex.

[0085] The lens 3 has a negative refractive power, the optical axis area of the object side surface 35 is concave and aspherical, the circumferential area of the object side surface 35 is convex, the optical axis area of the image side surface 36 is concave and aspherical, and the circumferential area of the image side surface 36 is concave.

[0086] The lens 4 has a positive refractive power, the optical axis area of the object side surface 45 is convex and aspherical, the circumferential area of the object side surface 45 is convex, the optical axis area of the image side surface 46 is concave and aspherical, and the circumferential area of the image side surface 46 is concave.

[0087] The lens 5 has a negative refractive power, the optical axis area of the object side surface 55 is convex and aspherical, the circumferential area of the object side surface 55 is convex, the optical axis area of the image side surface 56 is concave and aspherical, and the circumferential area of the image side surface 56 is concave.

[0088] The lens 6 has a positive refractive power, the optical axis area of the object side surface 65 is convex and aspherical, the circumferential area of the object side surface 65 is convex, the optical axis area of the image side surface 66 is convex and aspherical, and the circumferential area of the image side surface 66 is concave.

[0089] The lens 7 has a positive refractive power, the optical axis area of the object side surface 75 is convex and aspherical, the circumferential area of the object side surface 75 is convex, the optical axis area of the image side surface 76 is concave and aspherical, and the circumferential area of the image side surface 76 is concave.

[0090] The lens 8 has a negative refractive power, the optical axis area of the object side surface 85 is concave and aspherical, the circumferential area of the object side surface 85 is concave, the optical axis area of the image side surface 86 is concave and aspherical, and the circumferential area of the image side surface 86 is convex.

[0091] Further, the lens 4, the lens 5 and the lens 6 constitute a first lens group LS1, and the lens 7 and the lens 8 constitute a second lens group LS2, wherein the first lens group LS1 has a positive refractive power, and the second lens group LS2 has a negative refractive power. As shown in the figure, the zoom lens 10 of the second embodiment changes zoom by moving the first lens group LS1 and / or the second lens group LS2, the lens 4, the lens 5 and the lens 6 in the first lens group LS1 do not move relative to each other, and the lens 7 and the lens 8 in the second lens group LS2 do not move relative to each other. In addition, the lens 1, the prism P1, the lens 2, the lens 3, the prism P2 and the filter CF do not move relative to each other in the process of focusing the zoom lens 10. FIGS. 6A-6D

[0092] When the first lens group LS1 and the second lens group LS2 move simultaneously, the field angle can be changed. When the second lens group LS2 moves alone, the focal length can be changed. As shown in the figure, in the wide angle mode, FIG. 6A and FIG. 6C in the telephoto mode, FIG. 6C ​the distance between the second lens group LS2 and the prism P2 (1.341 mm) is relatively large FIG. 6A the distance between the second lens group LS2 and the prism P2 (1.649 mm) is relatively small. As shown in Fig. 2B, in the telephoto mode, FIG. 6B and FIG. 6D As shown in Fig. 2B, in the telephoto mode, FIG. 6D the distance between the second lens group LS2 and the prism P2 (2.930 mm) is relatively large FIG. 6B the distance between the second lens group LS2 and the prism P2 (4.580 mm) is relatively small.

[0093] Other detailed optical data of the second embodiment are shown in Table 4.

[0094] Table 4:

[0095]

[0096] In Table 4, the radius of curvature of the lens 1, the lens 2, the lens 3, the lens 4, the lens 5, the lens 6, the lens 7, and the lens 8 refers to the radius of curvature of each lens in the region of the optical axis. The distance of the object side surface 15 (1.000 mm as shown in Table 4) is the thickness of the lens 1 on the optical axis I. The distance of the image side surface 16 (0.000 mm as shown in Table 4) is the distance between the image side surface 16 and the light entrance surface S1 of the prism P1 on the optical axis I. That is, the lens 1 and the prism P1 are directly cemented. The distance of the light entrance surface S1 of the prism P1 (12.000 mm as shown in Table 4) is the total length of the optical axis I inside the prism P1. The distance of the light exit surface S3 (1.000 mm as shown in Table 4) is the distance between the light exit surface S3 of the prism P1 and the object side surface 25 of the lens 2 on the optical axis I, that is, the gap between the prism P1 and the lens 2 on the optical axis I, and so on. The distance of the object side surface 25 (1.496 mm as shown in Table 4) is the thickness of the lens 2 on the optical axis I, and so on. The distance of the light entrance surface S4 of the prism P2 (15.590 mm as shown in Table 4) is the total length of the optical axis I inside the prism P2.

[0097] Since the zoom lens 10 of the second embodiment can be zoomed by moving the first lens group LS1 and / or the second lens group LS2, the values d0, d9, d15, and d19 in Table 4 are variable, wherein the value d0 corresponds to the distance between the object and the object side surface 15 on the optical axis I, the value d9 corresponds to the gap between the lens 3 and the lens 4 on the optical axis I, the value d15 corresponds to the gap between the lens 6 and the lens 7 on the optical axis I, and the value d19 corresponds to the gap between the lens 8 and the prism P2 on the optical axis I. The values of the above variable values in the state one, the state two, the state three, and the state four are shown in Table 5, wherein the state one, the state two, the state three, and the state four respectively refer to FIG. 6A , FIG. 6B , FIG. 6C andFIG. 6D the state shown.

[0098] Table Five:

[0099] State One State Two State Three State Four d0 Infinity Infinity 1000.00 200.00 d9 3.696 1.500 3.696 1.500 d15 1.010 0.275 1.318 1.920 d19 1.649 4.580 1.341 2.930

[0100] In this embodiment, the object side surfaces 25, 35, 45, 55, 65, 75, 85 and the image side surfaces 26, 36, 46, 56, 66, 76, 86 are all aspherical surfaces, which are defined by the above-mentioned formula (1).

[0101] The conic constant K and the aspherical coefficients in the above-mentioned formula (1) of this embodiment are shown in Table Six. In Table Six, No. 25 represents the object side surface 25 of the lens 2, No. 26 represents the image side surface 26 of the lens 2, and so on.

[0102] Table Six:

[0103] Face K [a4] [a6] [a8] 25 0 -2.124530E-01 -5.837564E-02 -2.160436E-02 26 0 7.105949E-02 5.480426E-03 -1.689344E-02 35 0 1.984479E-01 7.463853E-02 5.329742E-04 36 0 -3.245772E-01 7.105237E-03 -2.820925E-03 45 0 -1.054463E-01 -3.562541E-03 -1.659033E-03 46 0 -5.900248E-02 4.869340E-04 3.778194E-03 55 0 -1.941770E-02 -2.873263E-03 9.448992E-03 56 0 -4.899612E-02 1.750361E-02 7.814210E-03 65 0 -1.872377E-01 1.790861E-02 -3.044087E-03 66 0 1.565218E-01 -8.554101E-05 2.229144E-03 75 0 6.873830E-01 3.269722E-02 2.538198E-03 76 0 1.067080E+00 1.434381E-01 3.011956E-02 85 0 -3.860162E-01 2.795422E-02 -6.007944E-03 86 0 -6.723428E-01 6.462889E-03 -2.018920E-02 Face a 10 ]]> a 12 ]]> a 14 ]]> a 16 ]]> 25 -5.003634E-03 7.316259E-04 5.914962E-04 1.644732E-04 26 -5.900597E-03 2.062982E-03 1.624718E-04 1.810562E-04 35 -7.032299E-04 5.247477E-04 -4.897506E-04 1.987602E-04 36 1.612188E-03 -5.337070E-05 1.234246E-04 1.446285E-04 45 5.072701E-04 -1.616107E-04 -7.896324E-05 -4.272471E-05 46 -1.811052E-03 1.028185E-04 -5.424341E-04 1.008005E-04 55 -5.975181E-03 1.693842E-03 -6.623464E-04 1.526764E-04 56 -6.086852E-03 1.287486E-03 -2.743444E-04 1.145322E-04 65 -4.276068E-03 1.015570E-03 3.400172E-04 2.868756E-04 66 6.722364E-04 1.401203E-04 1.739384E-05 9.405143E-07 75 -2.615119E-03 -9.293510E-04 -1.893987E-04 -1.048583E-04 76 -3.437286E-03 -3.245683E-03 -8.703304E-04 -1.772427E-04 85 -1.209180E-03 1.554042E-04 3.920512E-04 -5.731373E-05 86 -1.367873E-03 -7.892672E-04 -3.295691E-04 -2.677281E-04

[0104] With reference to Figs. 17A, 17B, 17C, 17D and 17E, the curves of the field curvature aberration in the tangential direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10 are shown in Figs. 17A, 17B, 17C, 17D and 17E, respectively. FIGS. 7A-7C , FIG. 7A Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 6A Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 7B Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 6A Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 7C Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 6A Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 7A Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 7B Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively. FIG. 7C Figs. 18A, 18B, 18C, 18D and 18E are graphs showing the curves of the field curvature aberration in the sagittal direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10, respectively.

[0105] With reference to Figs. 17A, 17B, 17C, 17D and 17E, the curves of the field curvature aberration in the tangential direction of the zoom lens 10 shown in Fig. 16A when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm are incident on the zoom lens 10 are shown in Figs. 17A, 17B, 17C, 17D and 17E, respectively. FIGS. 8A-8C , FIG. 8AThis illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6B The diagram shown is a field curvature aberration curve in the meridional direction when using zoom lens 10. FIG. 8B This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6B The diagram shows the field curvature aberration curve in the sagittal direction when using zoom lens 10. FIG. 8C This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6B The distortion curve shown is for zoom lens 10. FIG. 8A as well as FIG. 8B As shown in the field curvature aberration curve, the field curvature aberration of the five representative wavelengths falls within ±0.08mm across the entire field of view, indicating that the zoom lens 10 of this second embodiment can effectively eliminate field curvature aberration in telephoto mode with an infinity focal length. FIG. 8C As shown in the distortion curve, the distortion aberration of the five representative wavelengths is less than ±2.0% across the entire field of view, indicating that the zoom lens 10 of this second embodiment has good imaging quality in telephoto mode and at infinity focal length.

[0106] See also FIGS. 9A-9C , FIG. 9A This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6C The diagram shown is a field curvature aberration curve in the meridional direction when using zoom lens 10. FIG. 9B This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6C The diagram shows the field curvature aberration curve in the sagittal direction when using zoom lens 10. FIG. 9C This illustrates the incident light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. FIG. 6C The distortion curve shown is for zoom lens 10. FIG. 9A as well as FIG. 9B As shown in the field curvature aberration curve, the field curvature aberration of the five representative wavelengths falls within ±0.08mm across the entire field of view, indicating that the zoom lens 10 of this second embodiment can effectively eliminate field curvature aberration in wide-angle mode with a focal length of 1 meter. FIG. 9CAs shown in the distortion curve of the second embodiment, the distortion aberration of the five representative wavelengths is less than ±0.3% in the entire field of view, which indicates that the zoom lens 10 of the second embodiment has good imaging quality when the focal length is 1 meter in the wide-angle mode.

[0107] Referring to FIG. 1, a zoom lens 10 is shown. FIGS. 10A-10C FIG. 10A As shown in the field curvature curve of the second embodiment, the field curvature aberration of the five representative wavelengths is within ±0.10 mm in the entire field of view, which indicates that the zoom lens 10 of the second embodiment can effectively eliminate the field curvature aberration when the focal length is 0.2 meter in the telephoto mode. FIG. 6D As shown in the field curvature curve of the second embodiment, the field curvature aberration of the five representative wavelengths is within ±0.10 mm in the entire field of view, which indicates that the zoom lens 10 of the second embodiment can effectively eliminate the field curvature aberration when the focal length is 0.2 meter in the telephoto mode. FIG. 10B As shown in the field curvature curve of the second embodiment, the field curvature aberration of the five representative wavelengths is within ±0.10 mm in the entire field of view, which indicates that the zoom lens 10 of the second embodiment can effectively eliminate the field curvature aberration when the focal length is 0.2 meter in the telephoto mode. FIG. 6D As shown in the distortion curve of the second embodiment, the distortion aberration of the five representative wavelengths is less than ±1.6% in the entire field of view, which indicates that the zoom lens 10 of the second embodiment has good imaging quality when the focal length is 0.2 meter in the telephoto mode. FIG. 10C As shown in the distortion curve of the second embodiment, the distortion aberration of the five representative wavelengths is less than ±1.6% in the entire field of view, which indicates that the zoom lens 10 of the second embodiment has good imaging quality when the focal length is 0.2 meter in the telephoto mode. FIG. 6D FIG. 10A According to some embodiments of the present application, the Abbe number of the lens 5 and the Abbe number of the lens 7 are both less than 30. According to some embodiments of the present application, the ratio of the focal length of the lens 5 and the focal length of the lens 8 is greater than or equal to 1.50 and less than or equal to 2.50. FIG. 10B FIG. 10C In summary, the zoom lens provided by the embodiments of the present application has at least the following advantages: (1) the modular lens group is moved as a whole, which improves the stability of the optical performance; (2) the lens glued with the prism is a plano-convex spherical lens, which can reduce the assembly tolerance; and (3) the zoom lens has good imaging quality in the telephoto mode or the wide-angle mode.

[0108] In summary, the zoom lens provided by the embodiments of the present application has at least the following advantages: (1) the modular lens group is moved as a whole, which improves the stability of the optical performance; (2) the lens glued with the prism is a plano-convex spherical lens, which can reduce the assembly tolerance; and (3) the zoom lens has good imaging quality in the telephoto mode or the wide-angle mode.

[0109] In summary, the zoom lens provided by the embodiments of the present application has at least the following advantages: (1) the modular lens group is moved as a whole, which improves the stability of the optical performance; (2) the lens glued with the prism is a plano-convex spherical lens, which can reduce the assembly tolerance; and (3) the zoom lens has good imaging quality in the telephoto mode or the wide-angle mode.

[0110] ​​​It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A zoom lens, characterized in that, In order from the object side toward the image side along the optical axis, a first lens, a first prism, a lens group, and a second prism are sequentially included, wherein The lens group sequentially includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side toward the image side along the optical axis, The first lens to the eighth lens each include an object side surface facing the object side and passing an imaging light ray, and an image side surface facing the image side and passing the imaging light ray, The zoom lens has a total of eight lenses with refractive powers, and the refractive powers of the first lens to the eighth lens are positive, positive, negative, positive, negative, positive, positive, and negative, respectively.

2. The zoom lens according to claim 1, characterized by A ratio of a focal length of the fifth lens to a focal length of the eighth lens is greater than or equal to 1.50 and less than or equal to 2.

50.

3. The zoom lens according to claim 1, characterized by Abbe numbers of the fifth lens and the seventh lens are both less than 30.

4. The zoom lens according to claim 1, characterized by The fourth lens, the fifth lens, and the sixth lens constitute a first lens group, the seventh lens and the eighth lens constitute a second lens group, the first lens group has a positive refractive power, and the second lens group has a negative refractive power.

5. The zoom lens according to claim 4, characterized by A ratio of a focal length of the second lens group to a focal length of the first lens group falls between 1.0 and 1.

5.

6. The zoom lens according to claim 1, characterized by An optical axis area of the object side surface of the second lens is convex, and a circumferential area of the object side surface of the second lens is concave.

7. The zoom lens according to claim 6, characterized by An optical axis area of the image side surface of the second lens is concave.

8. The zoom lens according to claim 1, characterized by A circumferential area of the object side surface of the third lens is convex.

9. The zoom lens according to claim 8, characterized by An optical axis area of the image side surface of the third lens is concave, and a circumferential area of the image side surface of the third lens is concave.

10. The zoom lens according to claim 1, characterized by An optical axis area of the object side surface of the fourth lens is convex, and a circumferential area of the object side surface of the fourth lens is convex.

11. The zoom lens according to claim 1, characterized by An optical axis area of the object side surface of the fifth lens is convex, and a circumferential area of the object side surface of the fifth lens is convex.

12. The zoom lens according to claim 11, characterized by An optical axis area of the image side surface of the fifth lens is concave, and a circumferential area of the image side surface of the fifth lens is concave.

13. The zoom lens according to claim 1, characterized by An optical axis area of the object side surface of the sixth lens is convex, and a circumferential area of the object side surface of the sixth lens is convex.

14. The zoom lens according to claim 13, characterized by An optical axis area of the image side surface of the sixth lens is convex, and a circumferential area of the image side surface of the sixth lens is concave.

15. The zoom lens according to claim 1, characterized by A circumferential area of the object side surface of the seventh lens is convex.

16. The zoom lens according to claim 15, characterized by A circumferential area of the image side surface of the seventh lens is concave.

17. The zoom lens according to claim 1, characterized by An optical axis area of the image side surface of the eighth lens is concave.

18. The zoom lens according to claim 1, characterized by An optical axis area of the object side surface of the first lens is spherical.

Images