CN109932800B - Zoom lens - Google Patents

Abstract

A zoom lens, comprising: the first lens group is used for focusing and comprises a single lens which is a negative lens, the Abbe number of the single lens is set to be Vd, the refractive index of the single lens is set to be Nd, wherein Vd is more than or equal to 23 and less than or equal to 50, and Nd is more than or equal to 1.5 and less than or equal to 1.9; and at least one second lens group which carries out zooming and comprises a combination of a positive lens and a negative lens, wherein the combination of the positive lens and the negative lens is positioned behind the single lens of the first lens group. The invention can give consideration to the optimization of material characteristics and focusing effect by the optical matching of the Abbe number and the refractive index of a single lens, the first lens group is easy to manufacture only by the single lens, the production cost can be effectively reduced, and the projection imaging quality is also stabilized within a certain matching range by matching the effective radius and the maximum image height of the glass aspheric lens of the second lens group.

Description

Zoom lens

Technical Field

The invention relates to a zoom lens, in particular to a zoom lens which can give consideration to the optimization of material characteristics and focusing effect by means of the optical matching of the Abbe number and the refractive index of a single lens of a first lens group, is easy to manufacture, can effectively reduce the production cost, and can stabilize the projection imaging quality within a certain matching range by matching the effective radius and the maximum image height of a glass aspheric lens of a second lens group.

Background

The technology of the projection device is gradually mature, one of the main components of the projection device is a zoom lens, and the image can be clearly imaged, and the zoom lens is technically characterized by being composed of a first lens group close to the projection side and a second lens group close to the image source side, wherein the first lens group has negative diopter and is used for diverging light rays, and the second lens group has positive diopter and is used for converging light rays. Generally, the first lens group and the second lens group respectively have a plurality of lenses, such as taiwan patent publication nos. I534472, I529418, I507727, I476440, I476442, etc., the plurality of lens structures are quite complex, and the optical design of the plurality of lens structures has the main parameters of abbe number (Vd) and refractive index (Nd), the abbe number evaluates the value of the dispersion capability of an optical system, and when the abbe number is smaller, the dispersion degree is larger, and conversely, when the abbe number is larger, the dispersion is smaller; after light passes through the lens, the light is refracted due to different traveling speeds of light speed in different materials, the refractive index of the material can change along with the wavelength and is called dispersion, the relationship between the refractive index and the refractive index is related to the dispersion, and therefore, the Abbe number and the refractive index have an optical matching relationship.

Secondly, due to the development of optical technology, the projector not only can be used in offices for brief presentation, but also can be widely used in households for watching video and programs, so that manufacturers also research and develop the projector in order to reduce the size of the lens of the projector for the convenience of use and carrying, and the disadvantage of over-high manufacturing cost can be reduced when the size of the lens is reduced. The volume of the lens of the projection device is reduced, so that the projection device is light, the miniaturization of the projection device expected by consumers is met, and the manufacturing cost is reduced for manufacturers, but the projection imaging quality is influenced.

However, it is also an objective of the present invention to find that the plurality of lens structures of the first lens group in the prior art do not consider optical matching between abbe number and refractive index, cannot give consideration to material characteristics and focusing effect, is difficult to be a single lens with easy manufacturing, and cannot effectively reduce production cost, and how to balance the projection imaging quality of the lens of the projection apparatus with the manufacturing cost and volume of the lens of the projection apparatus by the optical design of the plurality of lens structures depends on the optical design of the plurality of lens structures.

Disclosure of Invention

The main technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a zoom lens, wherein the technical characteristics of optical matching of abbe number and refractive index of a single lens of a first lens group can also be considered, and the characteristics of materials and focusing effect can also be considered, so that the zoom lens can be easily made into a single lens, and is used for solving the problems of a plurality of lens structures of the first lens group in the prior art, thereby effectively reducing the production cost; the effective radius of the glass aspheric lens of the second lens group and the matching technical characteristics of the formed maximum image height are used for stabilizing the effect of projection imaging quality within a certain matching range.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a zoom lens comprises, in order from a projection side to an image source side: the first lens group is used for focusing and comprises a single lens which is a negative lens, the Abbe number of the single lens is set to be Vd, the refractive index of the single lens is set to be Nd, wherein Vd is more than or equal to 23 and less than or equal to 50, and Nd is more than or equal to 1.5 and less than or equal to 1.9; and at least one second lens group which carries out zooming and comprises a combination of a positive lens and a negative lens, wherein the combination of the positive lens and the negative lens is positioned behind a single lens of the first lens group.

According to the aforementioned feature, the lens further includes an aperture stop located in the second lens group, and the focal ratio of the aperture stop is set to be 1.8-2.2.

According to the aforementioned characteristics, the second lens group comprises at least one glass aspheric lens, the effective radius of the glass aspheric lens is set as SD, the maximum image height is set as MAX IMH, and the maximum image height satisfies 0.7< SD/MAX IMH < 1.2.

According to the features disclosed above, the aperture comprises at least three lenses of the second lens group.

According to the aforementioned characteristics, the zoom lens at least comprises two groups of cemented lenses of the second lens group.

According to the above-mentioned features, the single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a second cemented lens formed by a double convex lens and a double concave lens in sequence and are positioned between the first cemented lens and the diaphragm; the three lenses of the second lens group are respectively a biconvex lens and a biconcave lens in sequence to form a third cemented lens and the glass aspheric surface biconvex lens.

According to the above-mentioned features, the single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a double-convex lens and a double-concave lens in sequence to form a second cemented lens positioned between the first cemented lens and the diaphragm; the three lenses of the second lens group are respectively a third cemented lens and the glass aspheric concave-convex lens which are combined by a biconcave lens and a biconvex lens in sequence.

According to the above-mentioned features, the single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a biconvex lens and a concave-convex lens which are positioned between the first cemented lens and the aperture in sequence; the three lenses of the second lens group are respectively a convex-concave lens and a biconvex lens in sequence to form a third cemented lens and the glass aspheric concave-convex lens.

According to the above-mentioned features, the single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a biconvex lens and a concave-convex lens which are positioned between the first cemented lens and the aperture in sequence; the three lenses of the second lens group are respectively a third cemented lens and the glass aspheric surface biconvex lens which are combined by a biconcave lens and a biconvex lens in sequence.

By means of the technical means disclosed above, the present invention uses the technical characteristics of optical matching of abbe number and refractive index of the single lens of the first lens group, not only can give consideration to material characteristics and focusing effect, but also the manufacturing of the single lens is easy, and the production cost can be effectively reduced.

The invention has the advantages that the technical characteristics of optical matching of the Abbe number and the refractive index of the single lens of the first lens group can also give consideration to the material characteristics and the focusing effect, and the single lens can be easily manufactured, so that the problems of a plurality of lens structures of the first lens group in the prior art are solved, and the production cost is effectively reduced; the effective radius of the glass aspheric lens of the second lens group and the matching technical characteristics of the formed maximum image height are used for stabilizing the effect of projection imaging quality within a certain matching range.

Drawings

The invention is further illustrated with reference to the figures and examples.

FIG. 1A is a schematic view of a lens configuration according to a first embodiment of the present invention.

FIG. 1B is a schematic diagram of the effective radius and maximum image height of the first embodiment of the present invention.

Fig. 1C is a focusing and zooming schematic diagram according to a first embodiment of the invention.

FIG. 1D is a transverse ray fan diagram of a first embodiment of the present invention.

FIG. 1E is a graph of field curvature and distortion for a first embodiment aspect of the present invention.

Fig. 1F is a lateral chromatic aberration diagram of a first embodiment of the present invention.

FIG. 1G is a longitudinal aberration diagram of a first embodiment of the present invention.

FIG. 2A is a schematic view of a lens configuration according to a second embodiment of the present invention.

FIG. 2B is a schematic diagram of the effective radius and the maximum image height according to a second embodiment of the present invention.

Fig. 2C is a focusing and zooming schematic diagram according to a second embodiment of the invention.

FIG. 2D is a transverse ray fan diagram of a second embodiment of the present invention.

Fig. 2E is a graph of field curvature and distortion for a second embodiment aspect of the present invention.

Fig. 2F is a lateral chromatic aberration diagram of a second embodiment of the present invention.

FIG. 2G is a longitudinal aberration diagram of a second embodiment of the present invention.

FIG. 3A is a schematic view of a lens configuration according to a third embodiment of the present invention.

FIG. 3B is a schematic diagram of the effective radius and the maximum image height according to a third embodiment of the present invention.

Fig. 3C is a focusing and zooming diagram according to a third embodiment of the present invention.

FIG. 3D is a transverse ray fan diagram of a third embodiment of the present invention.

Fig. 3E is a graph of field curvature and distortion for a third embodiment aspect of the present invention.

Fig. 3F is a lateral chromatic aberration diagram of a third embodiment of the present invention.

FIG. 3G is a longitudinal aberration diagram of a third embodiment of the present invention.

FIG. 4A is a schematic view of a lens configuration according to a fourth embodiment of the present invention.

FIG. 4B is a schematic diagram of the effective radius and the maximum image height according to a fourth embodiment of the present invention.

Fig. 4C is a focusing and zooming schematic diagram according to a fourth embodiment of the invention.

FIG. 4D is a transverse ray fan diagram of a fourth aspect of the present invention.

Fig. 4E is a graph of field curvature and distortion for a fourth embodiment aspect of the present invention.

Fig. 4F is a lateral chromatic aberration diagram of a fourth embodiment of the present invention.

FIG. 4G is a longitudinal aberration diagram of a fourth embodiment of the present invention.

The reference numbers in the figures illustrate:

10A, 10B, 10C, 10D non-telecentric zoom lens

L1 Single lens

L2 positive lens

L3 negative lens

L4, L5 two-piece lens

L6, L7 and L8 three-piece lens

AP aperture

FS first lens group

ZM second lens group

Effective radius of SD

MAX IMH maximum image height

CG glass cover plate

IMA imaging surface

D1 first distance of movement

D2 second distance of movement

Detailed Description

Referring to fig. 1A to 1G, fig. 2A to 2G, fig. 3A to 3G, and fig. 4A to 4G, a zoom lens according to the present invention sequentially includes, from a projection side to an image source side: a first lens group FS which is used for focusing and comprises a single lens L1 and is a negative lens, wherein the Abbe number of the single lens L1 is Vd, the refractive index is Nd, Vd is more than or equal to 23 and less than or equal to 50, and Nd is more than or equal to 1.5 and less than or equal to 1.9; and at least one second lens group ZM for zooming and including a combination of a positive lens L2 and a negative lens L3, wherein the combination of the positive lens L2 and the negative lens L3 is located behind the single lens L1 of the first lens group FS, but not limited thereto.

In this embodiment, the aperture AP includes at least three lenses L6, L7, and L8 of the second lens group ZM; the second lens group ZM at least comprises a glass aspheric lens, the effective radius of the glass aspheric lens is set as SD, the maximum image height formed by the glass aspheric lens is set as MAX IMH, and the requirements that SD/MAX IMH is more than 0.7 and less than 1.2 are met; the zoom lens includes at least two cemented lenses of the second lens group ZM, but is not limited thereto. In addition, a Glass Cover plate (CG) and an image plane IMA of a Digital Micromirror Device (DMD) are sequentially arranged behind the second lens group ZM, but not limited thereto.

As shown in fig. 1A and 1B, which are aspects of the first embodiment of the zoom lens, the single lens L1 of the first lens group FS is a convex-concave lens; the positive lens L2 of the second lens group ZM is a biconvex lens and the negative lens L3 of the second lens group ZM is a biconcave lens to form a first cemented lens; the two lenses L4 and L5 of the second lens group ZM are respectively a second cemented lens formed by a combination of a biconvex lens and a biconcave lens in sequence and are positioned between the first cemented lens and the aperture AP; the three lenses L6, L7, and L8 of the second lens group ZM are respectively a third cemented lens and the glass aspheric biconvex lens combined by a biconvex lens and a biconcave lens in sequence, the SD of the glass aspheric biconvex lens is 7.0, and the IHM of the glass aspheric biconvex lens is 8.3.

In table one, the Lens (Lens) of table one lists L1R1 and L1R2 as the projection side surface and the image source side surface of the single Lens L1, respectively; L2R1 are respectively the projection side surfaces of the positive lens L2; L3R1 and L3R2 are the projection side surface and the image source side surface of the negative lens L3, respectively; L4R1, L5R1 and L5R2 are respectively the projection side surface and the image source side surface of the two lenses L4 and L5; aprestare is aperture AP; L6R1, L7R1, L7R2, L8R1, and L8R2 are the projection side surface and the image source side surface of the three lenses L6, L7, and L8, respectively, and the parameters of the Radius (Radius), the Thickness (Thickness), the abbe number (Vd), and the refractive index (Nd) of the projection side surface and the image source side surface of each lens are listed, and in accordance with table two, L8R1 and L8R2 in the glass aspheric lens (ASPH) are listed as the projection side surface and the image source side surface of the glass aspheric lens, and conc, 4TH, 6TH, 8TH, 10TH, 12TH, 14TH, and 16TH of each glass aspheric lens are listed.

Watch 1

Lens	Radius	Thickness	Nd	Vd
					L1R1	82.09	2.00	1.77	49.6
L1R2	27.01	D1
					L2R1	72.80	6.45	1.80	46.6
L3R1	-37.62	1.50	1.49	70.4
					L3R2	17.73	32.80
L4R1	26.24	4.60	1.83	42.7
					L5R1	-46.72	1.00	1.62	36.3
L5R2	40.00	4.40
					APERTURE	INF	1.18
L6R1	15.58	4.60	1.62	63.4
					L7R1	-72.60	0.80	1.76	27.5
L7R2	20.00	4.62
					L8R1	95.00	3.00	1.62	58.2
L8R2	-46.60	D2

Watch two

ASPH	L8R1	L8R2
			Radius	95.00	-46.60
Conic	0.00	0.00
			4TH	-7.07E-05	3.74E-06
6TH	2.15E-08	-1.40E-06
			8TH	-2.42E-09	1.20E-07
10th	2.87E-10	-5.10E-09
			12th	-3.87E-12	1.30E-10
14th	7.17E-15	-1.73E-12
			16th	2.16E-16	9.43E-15

As shown in fig. 1C, a first moving distance D1 is provided between the first lens group FS and the second lens group ZM; the glass aspheric lens (ASPH) forms the glass aspheric biconvex lens by table one and table two, and has a second moving distance D2 with the glass cover plate CG, so that the second lens group ZM zooms and the first lens group FS move to focus, and also forms a non-telecentric Zoom lens 10A, which matches table three, and the parameters of the Wide angle end (Wide) and the telephoto end (Tele) of the first moving distance D1 and the second moving distance D2 are listed in the zooming (Zoom), but not limited thereto.

Watch III

Zoom	Wide	Tele
			D1	17.21	9.24
D2	22.00	22.83

Accordingly, the non-telecentric zoom lens 10A, which simulates the lateral ray fan of fig. 1D at different wavelengths (0.450, 0.480, 0.550, 0.600, 0.630 μm), respectively, presents different image heights (IMH) (IMA: 0.0000mm, 1.6600mm, 3.3200mm, 4.9800mm, 6.6400mm, 8.3000mm) on the same imaging plane (IMA), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 50.000 μm); FIG. 1E is a plot of Field curvature and distortion with a Maximum Field of view (Maximum Field) of 28.073 degrees; FIG. 1F is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 8.3000 microns; the longitudinal aberration diagram of fig. 1G, with a Pupil Radius (Pupil Radius) of 4.1425 mm, also maintained good projection imaging quality.

As shown in fig. 2A and 2B, which are second embodiment of the zoom lens, the single lens L1 of the first lens group FS is a convex-concave lens; the positive lens L2 of the second lens group ZM is a biconvex lens and the negative lens L3 of the second lens group ZM is a biconcave lens to form a first cemented lens; the two lenses L4 and L5 of the second lens group ZM are respectively a double convex lens and a double concave lens in sequence to form a second cemented lens located between the first cemented lens and the aperture AP; the three lenses L6, L7, and L8 of the second lens group ZM are respectively a third cemented lens and the glass aspheric meniscus lens in a combination of a biconcave lens and a biconvex lens in sequence, the SD of the glass aspheric meniscus lens is 6.6, and the IHM of the glass aspheric meniscus lens is 8.3.

In table four, the Lens (Lens) lists L1R1 and L1R2 as the projection side surface and the image source side surface of the single Lens L1, respectively; L2R1 are respectively the projection side surfaces of the positive lens L2; L3R1 and L3R2 are the projection side surface and the image source side surface of the negative lens L3, respectively; L4R1, L5R1 and L5R2 are respectively the projection side surface and the image source side surface of the two lenses L4 and L5; aprestare is aperture AP; L6R1, L7R1, L7R2, L8R1, and L8R2 are the projection side surface and the image source side surface of the three lenses L6, L7, and L8, and the parameters of the Radius (Radius), the Thickness (Thickness), the abbe number (Vd), and the refractive index (Nd) of the projection side surface and the image source side surface of each lens are listed, and with table v, L8R1 and L8R2 in the glass aspheric lens (ASPH) are listed as the projection side surface and the image source side surface of the glass aspheric lens, and conc, 4TH, 6TH, 8TH, 10TH, 12TH, 14TH, and 16TH of each glass aspheric lens are listed.

Watch four

Lens	Radius	Thickness	Nd	Vd
					L1R1	70.47	3.00	1.80	46.6
L1R2	24.26	D1
					L2R1	72.98	5.79	1.80	46.6
L3R1	-35.18	2.01	1.49	70.4
					L3R2	16.82	25.13
L4R1	22.39	5.35	1.83	42.7
					L5R1	-24.39	0.81	1.72	29.5
L5R2	736.81	3.84
					APERTURE	INF	4.44
L6R1	-17.45	0.80	1.65	33.8
					L7R1	13.90	4.61	1.62	63.4
L7R2	-17.82	0.20
					L8R1	-25.04	4.09	1.61	57.4
L8R2	-17.18	D2

Watch five

ASPH	L8R1	L8R2
			Radius	-25.04	-17.18
Conic	0.00	0.00
			4TH	-1.86E-04	-6.25E-05
6TH	7.07E-06	1.18E-06
			8TH	-6.31E-07	-7.38E-08
10th	3.10E-08	2.95E-09
			12th	-8.56E-10	-6.44E-11
l4th	1.24E-11	7.31E-13
			16th	-7.40E-14	-3.31E-15

As shown in fig. 2C, a first moving distance D1 is provided between the first lens group FS and the second lens group ZM; the glass aspherical meniscus lens (ASPH) is formed by table four and table five, and has a second moving distance D2 with the glass cover plate CG, so that the second lens group ZM is zoomed and the first lens group FS is moved to focus, and a further non-telecentric Zoom lens 10B is also formed, and the parameters of the Wide angle end (Wide) and the telephoto end (Tele) of the first moving distance D1 and the second moving distance D2 are listed in the Zoom (Zoom) in combination with table six, but not limited thereto.

Watch six

Zoom	Wide	Tele
			D1	16.13	9.30
D2	22.00	22.84

Accordingly, the non-telecentric zoom lens 10B, which simulates the lateral ray fan of fig. 2D at different wavelengths (0.450, 0.480, 0.550, 0.600, 0.630 μm), respectively, presents different image heights (IMH) (IMA: 0.0000mm, 1.6600mm, 3.3200mm, 4.9800mm, 6.6400mm, 8.3000mm) on the same imaging plane (IMA), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 50.000 μm); FIG. 2E is a graph of Field curvature and distortion with a Maximum Field of view (Maximum Field) of 28.802 degrees; FIG. 2F is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 8.3000 microns; the longitudinal aberration diagram of fig. 2G, with a Pupil Radius (Pupil Radius) of 4.0124 mm, also maintained good projection imaging quality.

As shown in fig. 3A and 3B, which are aspects of the third embodiment of the zoom lens, the single lens L1 of the first lens group FS is a convex-concave lens; the positive lens L2 of the second lens group ZM is a biconvex lens and the negative lens L3 of the second lens group ZM is a biconcave lens to form a first cemented lens; the two lenses L4 and L5 of the second lens group ZM are respectively a biconvex lens and a concave-convex lens in sequence and are positioned between the first cemented lens and the diaphragm AP; the three lenses L6, L7, and L8 of the second lens group ZM are sequentially a convex-concave lens and a double-convex lens respectively to form a third cemented lens and the glass aspheric meniscus lens, the SD of the glass aspheric meniscus lens is 6.6, and the IHM is 8.3.

In table seven, the lenses (Lens) listed as L1R1 and L1R2 are the projection side surface and the image source side surface of the single Lens L1, respectively; L2R1 are respectively the projection side surfaces of the positive lens (L2); L3R1 and L3R2 are the projection side surface and the image source side surface of the negative lens L3, respectively; L4R1, L4R2, L5R1 and L5R2 are the projection side surface and the image source side surface of the two lenses L4 and L5 respectively; aprestare is aperture AP; L6R1, L7R1, L7R2, L8R1, and L8R2 are the projection side surface and the image source side surface of the three lenses L6, L7, and L8, and the parameters of the Radius (Radius), the Thickness (Thickness), the abbe number (Vd), and the refractive index (Nd) of each of the lenses are listed, and with table eight, L8R1 and L8R2 in the glass aspheric lens (ASPH) are listed as the projection side surface and the image source side surface of the glass aspheric lens, and conc, 4TH, 6TH, 8TH, 10TH, 12TH, 14TH, and 16TH of each of the glass aspheric lenses are listed.

Watch seven

Lens	Radius	Thickness	Nd	Vd
					L1R1	67.99	2.00	1.83	42.7
L1R2	24.44	D1
					L2R1	160.53	5.70	1.80	46.6
L3R1	-31.11	1.50	1.49	70.4
					L3R2	18.34	33.08
L4R1	33.70	5.30	1.49	70.4
					L4R2	-43.64	0.20
L5R1	17.55	3.48	1.80	46.6
					L5R2	25.29	4.56
APERTURE	INF	2.74
					L6R1	124.92	0.80	1.73	28.3
L7R1	10.75	4.54	1.50	81.6
					L7R2	-337.17	1.14
L8R1	-26.60	4.44	1.61	58.0
					L8R2	-19.09	D2

Table eight

ASPH	L8R1	L8R2
			Radius	-26.60	-19.09
Conic	0.00	0.00
			4TH	-9.96E-05	-2.53E-05
6TH	-1.14E-07	-1.29E-07
			8TH	7.02E-09	1.08E-08
10th	-1.15E-11	-1.18E-10
			12th	9.86E-14	7.24E-13
14th	1.40E-20	-2.04E-18
			16th	1.06E-23	1.06E-23

As shown in fig. 3C, the first lens group FS and the second lens group ZM have a first moving distance D1 therebetween; the glass aspheric meniscus lens (ASPH) is formed by tables seven and eight, and has a second moving distance D2 with the glass cover plate CG, so that the second lens group ZM zooms and the first lens group FS move to focus, and another non-telecentric Zoom lens 10C is also formed, and in cooperation with table nine, parameters of the Wide angle end (Wide) and the telephoto end (Tele) of the first moving distance D1 and the second moving distance D2 are listed in the zooming (Zoom), but not limited thereto.

Watch nine

Zoom	Wide	Tele
			D1	16.71	9.84
D2	22.00	22.91

Accordingly, the non-telecentric zoom lens 10C, which simulates the lateral ray fan of fig. 3D at different wavelengths (0.450, 0.480, 0.550, 0.600, 0.630 μm), respectively, presents different image heights (IMH) (IMA: 0.0000mm, 1.6600mm, 3.3200mm, 4.9800mm, 6.6400mm, 8.3000mm) on the same imaging plane (IMA), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 50.000 μm); FIG. 3E is a Field curvature and distortion plot with a Maximum Field of view (Maximum Field) of 28.300 degrees; FIG. 3F is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 8.3000 microns; the longitudinal aberration diagram of fig. 3G, with a Pupil Radius (Pupil Radius) of 4.2729 mm, also maintains good projection imaging quality.

As shown in fig. 4A and 4B, which are fourth embodiment aspects of the zoom lens, the single lens L1 of the first lens group FS is a convex-concave lens; the positive lens L2 of the second lens group ZM is a biconvex lens and the negative lens L3 of the second lens group ZM is a biconcave lens to form a first cemented lens; the two lenses L4 and L5 of the second lens group ZM are respectively a biconvex lens and a concave-convex lens in sequence and are positioned between the first cemented lens and the diaphragm AP; the three lenses L6, L7, and L8 of the second lens group ZM are respectively a third cemented lens and the glass aspheric biconvex lens combined by a biconcave lens and a biconvex lens in sequence, the SD of the glass aspheric biconvex lens is 6.55, and the IHM of the glass aspheric biconvex lens is 8.3.

In table ten, the Lens (Lens) lists L1R1 and L1R2 as the projection side surface and the image source side surface of the single Lens L1, respectively; L2R1 are respectively the projection side surfaces of the positive lens L2; L3R1 and L3R2 are the projection side surface and the image source side surface of the negative lens L3, respectively; L4R1, L4R2, L5R1 and L5R2 are the projection side surface and the image source side surface of the two lenses L4 and L5 respectively; aprestare is Aperture (AP); L6R1, L7R1, L7R2, L8R1, and L8R2 are the projection side surface and the image source side surface of the three lenses L6, L7, and L8, and the parameters of the projection side surface, the Radius (Radius), the Thickness (Thickness), the abbe number (Vd), and the refractive index (Nd) of each lens are listed, and in table eleven, L8R1 and L8R2 of the glass aspheric lens (ASPH) are listed as the projection side surface and the image source side surface of the glass aspheric lens, and conc, 4TH, 6TH, 8TH, 10TH, 12TH, 14TH, and 16TH of each glass aspheric lens are listed.

Watch ten

Lens	Radius	Thickness	Nd	Vd
					L1R1	75.04	1.60	1.77	49.6
L1R2	25.21	D1
					L2R1	125.10	5.56	1.77	49.6
L3R1	-30.61	4.62	1.52	52.4
					L3R2	18.25	29.80
L4R1	34.27	4.51	1.49	70.2
					L4R2	-44.18	0.10
L5R1	19.16	3.35	1.81	40.9
					L5R2	26.33	4.87
APERTURE	INF	6.32
					L6R1	-32.56	1.00	1.72	29.5
L7R1	13.05	4.42	1.62	63.3
					L7R2	-27.77	0.10
L8R1	135.57	1.77	1.61	57.9
					L8R2	-128.58	D2

Watch eleven

ASPH	L8R1	L8R2
			Radius	135.57	-128.58
Conic	0.00	0.00
			4TH	-3.09E-05	4.03E-06
6TH	-8.35E-07	-2.67E-07
			8TH	4.71E-08	2.11E-08
10th	-1.39E-09	-5.99E-10
			12th	2.35E-11	1.15E-11
14th	-1.45E-13	-7.41E-14
			16th	0.00E+00	0.00E+00

As shown in fig. 4C, a first moving distance D1 is provided between the first lens group FS and the second lens group ZM; the glass aspheric lens (ASPH) forms the glass aspheric biconvex lens by table ten and table eleven, and has a second moving distance D2 with the glass cover plate CG, so that the second lens group ZM zooms and the first lens group FS move to focus, and forms a further non-telecentric Zoom lens 10D, which matches table twelve, and the parameters of the Wide angle end (Wide) and the telephoto end (Tele) of the first moving distance D1 and the second moving distance D2 are listed in the zooming (Zoom), but not limited thereto.

Watch twelve

Zoom	Wide	Tele
			D1	16.81	9.45
D2	22.00	22.87

Accordingly, the non-telecentric zoom lens 10D, which simulates the lateral ray fan of fig. 4D at different wavelengths (0.450, 0.480, 0.550, 0.600, 0.630 μm), respectively, presents different image heights (IMH) (IMA: 0.0000mm, 1.6600mm, 3.3200mm, 4.9800mm, 6.6400mm, 8.3000mm) on the same imaging plane (IMA), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 50.000 μm); FIG. 4E is a graph of Field curvature and distortion with a Maximum Field of view (Maximum Field) of 27.917 degrees; FIG. 4F is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 8.3000 microns; the longitudinal aberration diagram of fig. 4G, with a Pupil Radius (Pupil Radius) of 4.2482 mm, also maintains good projection imaging quality.

Based on the above structure, the first lens group FS of the present invention only has the single lens L1, the matching of the optical characteristics of the single lens L1 can achieve better material characteristics and focusing effect, the single lens L1 is easy to manufacture, the production cost can be effectively reduced, the technical characteristics of matching the effective radius SD and the maximum image height (MAX IMH) of the glass aspheric lens of the second lens group ZM can be within a certain matching range, the projection imaging quality can be stabilized, and the effects of the two lens groups are multiplied.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

In summary, the present invention fully meets the needs of industrial development in terms of structural design, practical use and cost effectiveness, and the disclosed structure has an unprecedented innovative structure, novelty, creativity and practicability, and meets the requirements of the patent requirements of the invention, so that the application is filed by law.

Claims (9)

1. A zoom lens, comprising, in order from a projection side to an image source side:

the first lens group is used for focusing and is composed of a single lens and a negative lens, wherein the Abbe number of the single lens is Vd, the refractive index of the single lens is Nd, Vd is more than or equal to 23 and less than or equal to 50, and Nd is more than or equal to 1.5 and less than or equal to 1.9;

a second lens group for zooming and including a combination of a positive lens and a negative lens, the combination of the positive lens and the negative lens being located behind a single lens of the first lens group; and

a diaphragm located in the second lens group and having a focal ratio of 1.8-2.2.

2. The zoom lens of claim 1, wherein the second lens group comprises at least one glass aspheric lens, an effective radius of the glass aspheric lens is set to SD and a maximum image height thereof is set to MAX IMH, and the effective radius and the maximum image height satisfy 0.7< SD/MAX IMH < 1.2.

3. The zoom lens according to claim 1, wherein the second lens group is composed of three lenses after being stopped.

4. The zoom lens of claim 1, wherein the zoom lens comprises two groups of cemented lenses of the second lens group.

5. The zoom lens according to claim 3, wherein a single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a second cemented lens formed by a double convex lens and a double concave lens in sequence and are positioned between the first cemented lens and the diaphragm; the three lenses of the second lens group are respectively a biconvex lens and a biconcave lens in sequence to form a third cemented lens and a glass aspheric surface biconvex lens.

6. The zoom lens according to claim 3, wherein a single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a double-convex lens and a double-concave lens in sequence to form a second cemented lens positioned between the first cemented lens and the diaphragm; the three lenses of the second lens group are respectively a third cemented lens and a glass aspheric concave-convex lens which are combined by a biconcave lens and a biconvex lens in sequence.

7. The zoom lens according to claim 3, wherein a single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a biconvex lens and a concave-convex lens which are positioned between the first cemented lens and the aperture in sequence; the three lenses of the second lens group are respectively a convex-concave lens and a biconvex lens which are combined into a third cemented lens and a glass aspheric concave-convex lens in sequence.

8. The zoom lens according to claim 3, wherein a single lens of the first lens group is a convex-concave lens; the positive lens of the second lens group is a biconvex lens and the negative lens of the second lens group is a biconcave lens which are combined into a first cemented lens; the two lenses of the second lens group are respectively a biconvex lens and a concave-convex lens which are positioned between the first cemented lens and the aperture in sequence; the three lenses of the second lens group are respectively a third cemented lens and a glass aspheric surface biconvex lens which are combined by a biconcave lens and a biconvex lens in sequence.

9. A zoom lens, comprising, in order from a projection side to an image source side:

the first lens group is used for focusing and is composed of a single lens and a negative lens, wherein the Abbe number of the single lens is Vd, the refractive index of the single lens is Nd, Vd is more than or equal to 23 and less than or equal to 50, and Nd is more than or equal to 1.5 and less than or equal to 1.9;

a second lens group for zooming, wherein the second lens group is provided with a first cemented lens formed by a positive lens and a negative lens, the combination of the positive lens and the negative lens is positioned behind a single lens of the first lens group, the second lens group at least comprises a glass aspheric lens, the effective radius of the glass aspheric lens is set as SD, the maximum image height is set as MAX IMH, and the glass aspheric lens meets the condition that SD/MAX IMH is more than 0.7 and less than 1.2; and

and the aperture is positioned in the second lens group, the focal ratio of the aperture is set to be 1.8-2.2, three lenses formed after the aperture in the second lens group are respectively a third cemented lens and the glass aspheric lens in sequence, and two lenses of the second lens group are positioned between the first cemented lens and the aperture.

Images