A glass-plastic hybrid zoom lens and an imaging device

Abstract

The present application relates to the field of optics, specifically to a glass-plastic hybrid zoom lens and an imaging device. The glass-plastic hybrid zoom lens sequentially comprises, from an object side to an image side, a first fixed lens group with positive focal power, a variable zoom lens group with negative focal power, a second fixed lens group with positive focal power, a focusing lens group with positive focal power, and a third fixed lens group with positive focal power. The glass-plastic hybrid zoom lens satisfies the following conditional expressions: 9 < ft / fw < 11; -3 < fG2 / fw < -2; wherein ft is the focal length of the glass-plastic hybrid zoom lens in a telephoto state, fw is the focal length of the glass-plastic hybrid zoom lens in a wide-angle state, and fG2 is the focal length of the variable zoom lens group. Through the above structure and parameter limitation, the volume of the glass-plastic hybrid zoom lens is greatly reduced, and the magnification of the glass-plastic hybrid zoom lens is also increased to some extent, thereby increasing the resolving power of the glass-plastic hybrid zoom lens.

Description

Technical Field

[0001] This invention relates to the field of optics, specifically to a glass-plastic hybrid zoom lens and imaging device. Background Technology

[0002] Iris recognition technology identifies individuals based on the iris of the eye and is used in security equipment (such as access control systems) and locations with high confidentiality requirements.

[0003] The human eye is composed of the sclera, iris, pupil, lens, and retina. The iris is a ring-shaped structure located between the black pupil and the white sclera, containing numerous intricate features such as spots, filaments, coronas, stripes, and crypts. Furthermore, once formed during fetal development, the iris remains unchanged throughout life. These characteristics determine the uniqueness of the iris, and consequently, the uniqueness of one's identity. Therefore, the iris can be used as a means of identifying each individual.

[0004] The biometric iris recognition lens is the core of iris recognition technology. Currently, biometric iris recognition lenses usually use zoom lenses to identify user identity information at different distances. However, in order to increase the success rate of recognition, the zoom lens in the current biometric iris recognition lens usually sacrifices the size and magnification of the lens, and at the same time greatly increases the cost. Summary of the Invention

[0005] This invention will solve the existing technical problems and provide a glass-plastic hybrid zoom lens and imaging device, which greatly reduces the size of the glass-plastic hybrid zoom lens, while also increasing the magnification and resolution of the glass-plastic hybrid zoom lens to a certain extent.

[0006] The technical solution provided by this invention is as follows:

[0007] A glass-plastic hybrid zoom lens, wherein the glass-plastic hybrid zoom lens is composed of a first fixed lens group with positive optical power, a zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with positive optical power, and a third fixed lens group with positive optical power, in sequence from the object plane side to the image plane side.

[0008] The zoom lens group and the focusing lens group move along the main optical axis of the glass-plastic hybrid zoom lens;

[0009] The first fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive optical power, and a third fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The first fixed lens and the second fixed lens are cemented together.

[0010] The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with negative optical power, and a sixth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The fifth fixed lens and the sixth fixed lens are cemented together.

[0011] The third fixed lens group consists of three lenses, including at least one lens with positive optical power and one lens with negative optical power.

[0012] The glass-plastic hybrid zoom lens satisfies the following condition:

[0013] 9 < ft / fw < 11;

[0014] -3 < fG2 / fw < -2;

[0015] Wherein, ft is the focal length of the glass-plastic hybrid zoom lens in telephoto mode, fw is the focal length of the glass-plastic hybrid zoom lens in wide-angle mode, and fG2 is the focal length of the zoom lens group.

[0016] In this technical solution, by limiting the structure and parameters mentioned above, the volume of the glass-plastic hybrid zoom lens is greatly reduced, while the magnification of the glass-plastic hybrid zoom lens can be increased to a certain extent, thereby increasing the resolution of the glass-plastic hybrid zoom lens.

[0017] Preferably, the zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with negative optical power, and a fourth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0018] Preferably, the focusing lens group consists of a first focusing lens with positive optical power, a second focusing lens with positive optical power, and a third focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side, with the second focusing lens and the third focusing lens cemented together.

[0019] Preferably, the third fixed lens group consists of a seventh fixed lens with positive optical power, an eighth fixed lens with negative optical power, and a ninth fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0020] Preferably, the third fixed lens group consists of a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0021] Preferably, each of the zoom lens group, the focusing lens group, and the third fixed lens group is provided with at least one plastic aspherical lens.

[0022] In this technical solution, the number of lenses used in the glass-plastic hybrid zoom lens is greatly reduced by setting the plastic aspherical surface, thereby realizing the miniaturization of the glass-plastic hybrid zoom lens and increasing the resolution of the glass-plastic hybrid zoom lens.

[0023] Preferably, the zoom lens group satisfies the following condition:

[0024] 0.8 < fb1 / fG2 < 1.2;

[0025] fb4 / fG2 > 2;

[0026] Wherein, fb1 is the focal length of the first zoom lens, and fb4 is the focal length of the fourth zoom lens.

[0027] In this technical solution, by limiting the above parameters, the first zoom lens can better receive the light path of the first fixed lens group and adjust the light path at the same time. The fourth zoom lens can correct the light path emitted by the zoom lens group, reducing the possibility of excessive chromatic aberration and coma in the glass-plastic hybrid zoom lens.

[0028] Preferably, the glass-plastic hybrid zoom lens satisfies the following condition:

[0029] 0.3 < XG2 / TTL < 0.4;

[0030] Wherein, XG2 is the moving distance of the zoom lens group.

[0031] In this technical solution, by limiting the moving distance of the zoom lens group, both miniaturization of the glass-plastic hybrid zoom lens and zoom at a certain magnification of the glass-plastic hybrid zoom lens are achieved.

[0032] Preferably, the glass-plastic hybrid zoom lens satisfies the following condition:

[0033] XG4 / XG2 < 0.4;

[0034] Wherein, XG4 is the moving distance of the focusing lens group.

[0035] In this technical solution, by limiting the small moving distance of the focusing lens group, the miniaturization of the glass-plastic hybrid zoom lens is achieved. It also enables the focusing lens group to correct the chromatic aberration and coma of the front group, thereby increasing the resolving power of the glass-plastic hybrid zoom lens.

[0036] One of the objectives of this invention is to provide an imaging device, comprising: a glass-plastic hybrid zoom lens; and an imaging element configured to receive an image formed by the glass-plastic hybrid zoom lens.

[0037] Compared with the prior art, the glass-plastic hybrid zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0038] 1. By limiting the structure and parameters mentioned above, the volume of the glass-plastic hybrid zoom lens is greatly reduced, while the magnification of the glass-plastic hybrid zoom lens can be increased to a certain extent, thus increasing the resolution of the glass-plastic hybrid zoom lens.

[0039] 2. With the above parameters in place, the first zoom lens can receive the light path of the first fixed lens group better and adjust the light path at the same time. The fourth zoom lens can correct the light path emitted by the zoom lens group, reducing the possibility of excessive chromatic aberration and coma in the glass-plastic hybrid zoom lens.

[0040] 3. By limiting the small moving distance of the focusing lens group, the miniaturization of the glass-plastic hybrid zoom lens is achieved. It also enables the focusing lens group to correct for chromatic aberration and coma of the front group, thereby increasing the resolving power of the glass-plastic hybrid zoom lens. Attached Figure Description

[0041] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a glass-plastic hybrid zoom lens and imaging device.

[0042] Figure 1 This is a schematic diagram of the structure of a glass-plastic hybrid zoom lens according to the present invention;

[0043] Figure 2 This is a coma diagram of a glass-plastic hybrid zoom lens in telephoto mode according to the present invention;

[0044] Figure 3 This is an aberration diagram of a glass-plastic hybrid zoom lens in telephoto mode according to the present invention;

[0045] Figure 4 This invention relates to a coma diagram of a glass-plastic hybrid zoom lens in its wide-angle state.

[0046] Figure 5 This is an aberration diagram of a glass-plastic hybrid zoom lens in the wide-angle state according to the present invention;

[0047] Figure 6 This is a schematic diagram of another glass-plastic hybrid zoom lens according to the present invention;

[0048] Figure 7 This is another coma diagram of the telephoto state of the glass-plastic hybrid zoom lens of the present invention;

[0049] Figure 8 This is an aberration diagram of another glass-plastic hybrid zoom lens in the telephoto state according to the present invention;

[0050] Figure 9 This is another coma diagram of the wide-angle state of the glass-plastic hybrid zoom lens of the present invention;

[0051] Figure 10This is an aberration diagram of another glass-plastic hybrid zoom lens in the wide-angle state according to the present invention.

[0052] Explanation of reference numerals: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Third fixed lens group; G6, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; a5, Fifth fixed lens; a6, Sixth fixed lens; a7, Seventh fixed lens; a8, Eighth fixed lens; a9, Ninth fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; c1, First focusing lens; c2, Second focusing lens; c3, Third focusing lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0055] Example 1

[0056] like Figure 1 and Figure 6 As shown, a glass-plastic hybrid zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with positive optical power, and a third fixed lens group G5 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0057] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the glass-plastic hybrid zoom lens;

[0058] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive optical power, and a third fixed lens a3 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0059] The second fixed lens group G3 consists of a fourth fixed lens a4 with positive optical power, a fifth fixed lens a5 with negative optical power, and a sixth fixed lens a6 with positive optical power, from the object plane side to the image plane side. The fifth fixed lens a5 and the sixth fixed lens a6 are cemented together.

[0060] The third fixed lens group G5 consists of three lenses, including at least one lens with positive optical power and one lens with negative optical power.

[0061] The glass-plastic hybrid zoom lens satisfies the following condition:

[0062] 9 < ft / fw < 11;

[0063] -3 < fG2 / fw < -2;

[0064] Wherein, ft is the focal length of the glass-plastic hybrid zoom lens in telephoto mode, fw is the focal length of the glass-plastic hybrid zoom lens in wide-angle mode, and fG2 is the focal length of the zoom lens group G2.

[0065] In this embodiment, by limiting the structure and parameters described above, the volume of the glass-plastic hybrid zoom lens is greatly reduced, while the magnification of the glass-plastic hybrid zoom lens can be increased to a certain extent, thereby increasing the resolution of the glass-plastic hybrid zoom lens.

[0066] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with negative optical power, and a fourth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0067] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power, a second focusing lens c2 with positive optical power, and a third focusing lens c3 with negative optical power, arranged sequentially from the object plane side to the image plane side. The second focusing lens c2 and the third focusing lens c3 are cemented together.

[0068] The third fixed lens group G5 consists of a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0069] The third fixed lens group G5 consists of a seventh fixed lens a7 with negative optical power, an eighth fixed lens a8 with positive optical power, and a ninth fixed lens a9 with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0070] Each of the zoom lens group G2, the focusing lens group G4, and the third fixed lens group G5 contains at least one plastic aspherical lens.

[0071] By using plastic aspherical surfaces, the number of lenses used in the glass-plastic hybrid zoom lens is greatly reduced, enabling miniaturization of the glass-plastic hybrid zoom lens and increasing its resolving power.

[0072] The zoom lens group G2 satisfies the following condition:

[0073] 0.8 < fb1 / fG2 < 1.2;

[0074] fb4 / fG2 > 2;

[0075] Wherein, fb1 is the focal length of the first zoom lens b1, and fb4 is the focal length of the fourth zoom lens.

[0076] With the above parameters defined, the first zoom lens b1 can receive the light path of the first fixed lens group G1 better and adjust the light path at the same time. The fourth zoom lens can correct the light path emitted by the zoom lens group G2, reducing the possibility of excessive chromatic aberration and coma in the glass-plastic hybrid zoom lens.

[0077] The glass-plastic hybrid zoom lens satisfies the following condition:

[0078] 0.3 < XG2 / TTL < 0.4;

[0079] Wherein, XG2 is the moving distance of the zoom lens group G2.

[0080] By limiting the moving distance of the zoom lens group G2, both miniaturization of the glass-plastic hybrid zoom lens and zoom at a certain magnification are achieved.

[0081] The glass-plastic hybrid zoom lens satisfies the following condition:

[0082] XG4 / XG2 < 0.4;

[0083] Wherein, XG4 is the moving distance of the focusing lens group G4.

[0084] By limiting the small moving distance of the focusing lens group G4, the miniaturization of the glass-plastic hybrid zoom lens is achieved. It also enables the focusing lens group G4 to correct chromatic aberration and coma of the front group, thereby increasing the resolving power of the glass-plastic hybrid zoom lens.

[0085] Example 2

[0086] like Figures 1 to 5As shown, a glass-plastic hybrid zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with positive optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0087] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the glass-plastic hybrid zoom lens;

[0088] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive optical power, and a third fixed lens a3 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0089] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with negative optical power, and a fourth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0090] The second fixed lens group G3 consists of a fourth fixed lens a4 with positive optical power, a fifth fixed lens a5 with negative optical power, and a sixth fixed lens a6 with positive optical power, from the object plane side to the image plane side. The fifth fixed lens a5 and the sixth fixed lens a6 are cemented together.

[0091] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power, a second focusing lens c2 with positive optical power, and a third focusing lens c3 with negative optical power, arranged sequentially from the object plane side to the image plane side. The second focusing lens c2 and the third focusing lens c3 are cemented together.

[0092] The third fixed lens group G5 consists of three lenses, including at least one lens with positive optical power and one lens with negative optical power.

[0093] The third fixed lens group G5 consists of a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0094] The auxiliary component G6 is a protective glass CG.

[0095] The basic lens data of the glass-plastic hybrid zoom lens of this embodiment is shown in Table 1, the variable parameters in Table 1 are shown in Table 2, and the aspherical coefficients are shown in Table 3.

[0096] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0097] In Table 2, the WIDE column indicates the specific values ​​of each variable parameter when the hybrid zoom lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the hybrid zoom lens is in the telephoto position.

[0098] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0099] Table 1

[0100]

[0101]

[0102] Table 2

[0103] WIDE TELE D1 0.7 39.33 D2 39.33 0.7 D3 12.11 1.07 D4 2.21 13.25

[0104] Table 3

[0105]

[0106]

[0107] In this embodiment, ft = 47.81 mm, fw = 4.6 mm, ft / fw = 10.39, fno = 1.83~2.85, and TTL = 110.02;

[0108] Wherein, ft is the focal length of the glass-plastic hybrid zoom lens in telephoto mode, fw is the focal length of the glass-plastic hybrid zoom lens in wide-angle mode, fno is the aperture number of the glass-plastic hybrid zoom lens, and TTL is the total optical length of the glass-plastic hybrid zoom lens.

[0109] fG2=-10.1mm, fG2 / fw=-2.2;

[0110] fG5=42.83mm, fG5 / ft=0.9;

[0111] Wherein, fG2 is the focal length of the zoom lens group G2, and fG5 is the focal length of the third fixed lens group G5.

[0112] fb1=-11.25mm, fb4=39mm;

[0113] fb1 / fG2=1.11, fb4 / fG2=3.86;

[0114] Wherein, fb1 is the focal length of the first zoom lens b1, and fb4 is the focal length of the fourth zoom lens.

[0115] XG2=38.63mm, XG2 / TTL=0.35;

[0116] XG4=11.04mm, XG4 / XG2=0.29;

[0117] Wherein, XG2 is the moving distance of the zoom lens group G2, and XG4 is the moving distance of the focusing lens group G4.

[0118] Example 3

[0119] like Figures 6 to 10 As shown, a glass-plastic hybrid zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with positive optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0120] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the glass-plastic hybrid zoom lens;

[0121] The first fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive optical power, and a third fixed lens a3 with positive optical power, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0122] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with negative optical power, and a fourth zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0123] The second fixed lens group G3 consists of a fourth fixed lens a4 with positive optical power, a fifth fixed lens a5 with negative optical power, and a sixth fixed lens a6 with positive optical power, from the object plane side to the image plane side. The fifth fixed lens a5 and the sixth fixed lens a6 are cemented together.

[0124] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power, a second focusing lens c2 with positive optical power, and a third focusing lens c3 with negative optical power, arranged sequentially from the object plane side to the image plane side. The second focusing lens c2 and the third focusing lens c3 are cemented together.

[0125] The third fixed lens group G5 consists of three lenses, including at least one lens with positive optical power and one lens with negative optical power.

[0126] The third fixed lens group G5 consists of a seventh fixed lens a7 with negative optical power, an eighth fixed lens a8 with positive optical power, and a ninth fixed lens a9 with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0127] The auxiliary component G6 is a protective glass CG.

[0128] The basic lens data of the glass-plastic hybrid zoom lens of this embodiment is shown in Table 4, the variable parameters in Table 4 are shown in Table 5, and the aspherical coefficients are shown in Table 6.

[0129] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0130] In Table 5, the WIDE column indicates the specific values ​​of each variable parameter when the hybrid zoom lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the hybrid zoom lens is in the telephoto position.

[0131] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0132] Table 4

[0133]

[0134]

[0135] Table 5

[0136] WIDE TELE D1 0.7 35.84 D2 35.84 0.7 D3 14.32 1 D4 2.98 16.3

[0137] Table 6

[0138]

[0139] In this embodiment, ft = 47.84 mm, fw = 4.6 mm, ft / fw = 10.4, fno = 1.81~2.63, and TTL = 107.04;

[0140] Wherein, ft is the focal length of the glass-plastic hybrid zoom lens in telephoto mode, fw is the focal length of the glass-plastic hybrid zoom lens in wide-angle mode, fno is the aperture number of the glass-plastic hybrid zoom lens, and TTL is the total optical length of the glass-plastic hybrid zoom lens.

[0141] fG2=-9.82mm, fG2 / fw=-2.13;

[0142] fG5=38.63mm, fG5 / ft=0.81;

[0143] Wherein, fG2 is the focal length of the zoom lens group G2, and fG5 is the focal length of the third fixed lens group G5.

[0144] fb1=-11.3mm, fb4=28.58mm;

[0145] fb1 / fG2=1.15, fb4 / fG2=2.91;

[0146] Wherein, fb1 is the focal length of the first zoom lens b1, and fb4 is the focal length of the fourth zoom lens.

[0147] XG2=35.14mm, XG2 / TTL=0.328;

[0148] XG4=13.32mm, XG4 / XG2=0.379;

[0149] Wherein, XG2 is the moving distance of the zoom lens group G2, and XG4 is the moving distance of the focusing lens group G4.

[0150] Example 4

[0151] An imaging device, such as Figures 1 to 10 As shown, it includes: a glass-plastic hybrid zoom lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the glass-plastic hybrid zoom lens.

[0152] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A glass-plastic hybrid zoom lens characterized by comprising: The glass-plastic hybrid zoom lens comprises, from the object side to the image side, a first fixed lens group with positive refractive power, a zoom lens group with negative refractive power, a second fixed lens group with positive refractive power, a focusing lens group with positive refractive power, and a third fixed lens group with positive refractive power. The zoom lens group and the focusing lens group move along the main optical axis of the glass-plastic hybrid zoom lens. The first fixed lens group comprises, from the object side to the image side, a first fixed lens with negative refractive power, a second fixed lens with positive refractive power, and a third fixed lens with positive refractive power, and the first fixed lens and the second fixed lens are cemented. The zoom lens group comprises, from the object side to the image side, a first zoom lens with negative refractive power, a second zoom lens with negative refractive power, a third zoom lens with negative refractive power, and a fourth zoom lens with positive refractive power. The second fixed lens group comprises, from the object side to the image side, a fourth fixed lens with positive refractive power, a fifth fixed lens with negative refractive power, and a sixth fixed lens with positive refractive power, and the fifth fixed lens and the sixth fixed lens are cemented. The focusing lens group comprises, from the object side to the image side, a first focusing lens with positive refractive power, a second focusing lens with positive refractive power, and a third focusing lens with negative refractive power, and the second focusing lens and the third focusing lens are cemented. The third fixed lens group comprises three lenses, at least one of which has positive refractive power and at least one of which has negative refractive power; the third fixed lens group comprises, from the object side to the image side, a seventh fixed lens with positive refractive power, an eighth fixed lens with negative refractive power, and a ninth fixed lens with positive refractive power; or the third fixed lens group comprises, from the object side to the image side, a seventh fixed lens with negative refractive power, an eighth fixed lens with positive refractive power, and a ninth fixed lens with negative refractive power. The glass-plastic hybrid zoom lens satisfies the following condition formula: 9 < ft / fw < 11; -3 < fG2 / fw < -2; wherein ft is the focal length of the glass-plastic hybrid zoom lens in a telephoto state, fw is the focal length of the glass-plastic hybrid zoom lens in a wide-angle state, and fG2 is the focal length of the zoom lens group.

2. The glass-plastic hybrid zoom lens according to claim 1, wherein at least one plastic aspheric lens is arranged in the zoom lens group, the focusing lens group, and the third fixed lens group.

3. The glass-plastic hybrid zoom lens according to claim 1, wherein the zoom lens group satisfies the following condition formula: 0.8 < fb1 / fG2 < 1.2; fb4 / fG2 > 2; wherein fb1 is the focal length of the first zoom lens, and fb4 is the focal length of the fourth zoom lens.

4. The glass-plastic hybrid zoom lens according to claim 1, wherein the glass-plastic hybrid zoom lens satisfies the following condition formula: 0.3 < XG2 / TTL < 0.4; wherein XG2 is the moving distance of the zoom lens group.

5. The glass-plastic hybrid zoom lens according to claim 1, wherein the glass-plastic zoom lens satisfies the following condition formula: XG4 / XG2 < 0.4; ​ ​ ​ ​ Wherein, XG4 is the moving distance of the focusing lens group.

6. A glass-plastic hybrid zoom lens according to claim 1, characterized in that: The glass-plastic hybrid zoom lens satisfies the following condition: 0.8 < fG5 / ft < 1; Wherein, fG5 is the focal length of the third fixed lens group.

7. An image forming apparatus characterized by comprising: include: The glass-plastic hybrid zoom lens as described in any one of claims 1 to 6; And an imaging element, configured to receive an image formed by the glass-plastic hybrid zoom lens.

Images