Lens assembly structure of digital camera

Abstract

The utility model discloses a digital camera lens assembly structure, which comprises lens optical structures, and is characterized in that the lens optical structures comprise eight groups and ten pieces, and sequentially comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens from the object space, wherein the fifth lens and the sixth lens are glued, and the seventh lens and the eighth lens are glued. According to the utility model, the lenses with different types, different curvature radiuses, different refractive indexes and different aberrations are arranged, and a reasonable combination and arrangement mode is adopted, so that the lens assembly adaptive to various focal lengths is realized, the lens assembly can be generally used for most lenses in the market, and the focal length of the lens assembly has various changes including 35MM-100MM; by arranging eight groups and ten lens assemblies, compared with a common lens structure in the market, the lens structure is simpler, the number of used lenses is smaller, the cost of the lens is reduced, and the market competition is enhanced.

Description

Technical Field

[0001] The utility model relates to the field of digital camera lenses, and specifically to a structure of a digital camera lens assembly. Background Art

[0002] Lenses with different focal lengths are suitable for shooting different subjects and scenes. Briefly speaking, the shorter the focal length of the lens, the larger the shooting angle of view, and the stronger the sense of layering and three-dimensionality. While the longer the focal length of the lens, the smaller the shooting angle of view, and the stronger the sense of space compression. In the prior art, the range and structure of each group of lens focal lengths are different and cannot be adapted and used interchangeably with each other. This undoubtedly reduces the applicable range of the lens assembly structure and needs to be improved. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a structure of a digital camera lens assembly, aiming to improve the problem that the lens assemblies of existing digital cameras with different focal lengths cannot be used interchangeably.

[0004] To achieve the above purpose, as an improvement of the utility model, a structure of a digital camera lens assembly is provided, which includes a lens optical structure. The lens optical structure consists of 10 lenses in 8 groups, and successively includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens from the object side. Among them, the fifth lens and the sixth lens are cemented, and the seventh lens and the eighth lens are cemented; the first lens is a meniscus negative lens, the second lens is a meniscus positive lens, the third lens is a meniscus positive lens, the fourth lens is a meniscus negative lens, the fifth lens is a biconcave negative lens, the sixth lens is a biconvex positive lens, the seventh lens is a biconvex positive lens, the eighth lens is a biconcave negative lens, the ninth lens is a plano-convex positive lens, and the tenth lens is a meniscus negative lens; the diaphragm is located between the sixth lens and the seventh lens.

[0005] Furthermore, the refractive index of the optical glass is represented as Nd, and the Abbe number of the optical glass is Vd:

[0006] The material properties of the first lens are 1.5 < Nd < 1.7, and the Abbe number is 25 < Vd < 45;

[0007] The material properties of the second lens are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60;

[0008] The material properties of the third lens are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60;

[0009] The material properties of the fourth lens are 1.55 < Nd < 1.75, and the Abbe number is 20 < Vd < 40;

[0010] The material properties of the fifth lens are such that 1.5 < Nd < 1.7 and 20 < Vd < 40;

[0011] The material properties of the sixth lens are such that 1.8 < Nd < 2.0 and 35 < Vd < 55;

[0012] The material properties of the seventh lens are such that 1.8 < Nd < 2.0 and 25 < Vd < 45;

[0013] The material properties of the eighth lens are such that 1.7 < Nd < 1.9 and 20 < Vd < 40;

[0014] The material properties of the ninth lens are such that 1.75 < Nd < 1.95 and 40 < Vd < 60;

[0015] The material properties of the tenth lens are such that 1.7 < Nd < 1.9 and 20 < Vd < 40.

[0016] Furthermore, setting the focal length of the lens as f0, the focal length of the combination of the fifth lens and the sixth lens is f56;

[0017] The combined fifth lens and sixth lens satisfy the following relationship:

[0018] The absolute value of the focal length of the combined fifth lens and sixth lens is greater than 3 times the focal length of the lens and less than 6 times the focal length of the lens:

[0019] 3f0 < |f56| < 6f0.

[0020] Furthermore, setting the focal length of the lens as f0, the focal length of the combination of the seventh lens and the eighth lens is f78;

[0021] The combined seventh lens and eighth lens satisfy the following relationship:

[0022] The absolute value of the focal length of the combined seventh lens and eighth lens is greater than 1 times the focal length of the lens and less than 3 times the focal length of the lens:

[0023] f0 < f78 < 3f0.

[0024] Furthermore, the combined lens formed by the seventh lens and the eighth lens is an optical component that moves along the optical axis direction, and the moving distance of this combined lens is between 0 and 20 mm;

[0025] Moving the combined lens can focus the lens, and the focusing range is from 20 mm to infinity.

[0026] Compared with the prior art, the beneficial effects of the present utility model are:

[0027] 1. The utility model realizes a lens assembly adapted to a variety of focal lengths by arranging lenses of various types, different curvature radii, different refractive indices and different aberrations, and by a reasonable combination and arrangement method. The lens assembly can be commonly used for most lenses on the market, and the focal length has a variety of variations, ranging from 35MM to 100MM. 2. The utility model arranges the lens assembly into 8 groups of 10 lenses. Compared with the ordinary lens structure on the market, the lens structure of the utility model is simpler, and the number of lenses used is less, which is conducive to reducing the cost of the lens and enhancing the market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0029] Figure 2 This is a schematic diagram of the focal length adjustment structure state of the utility model;

[0030] Figure 3 This is a schematic diagram of the focal length adjustment structure of the utility model. In the figure: 1, the first lens; 2, the second lens; 3, the third lens; 4, the fourth lens; 5, the fifth lens; 6, the sixth lens; 7, the seventh lens; 8, the eighth lens; 9, the ninth lens; 10, the tenth lens; 11, the light barrier. DETAILED DESCRIPTION

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1As shown in the figure, a digital camera lens assembly structure includes a lens optical structure. The lens optical structure consists of 10 lenses in 8 groups, which sequentially include the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10 from the object side. Among them, the fifth lens 5 and the sixth lens 6 are cemented, and the seventh lens 7 and the eighth lens 8 are cemented; the first lens 1 is a meniscus negative lens, the second lens 2 is a meniscus positive lens, the third lens 3 is a meniscus positive lens, the fourth lens 4 is a meniscus negative lens, the fifth lens 5 is a biconcave negative lens, the sixth lens 6 is a biconvex positive lens, the seventh lens 7 is a biconvex positive lens, the eighth lens 8 is a biconcave negative lens, the ninth lens 9 is a plano-convex positive lens, and the tenth lens 10 is a meniscus negative lens; the aperture stop 11 is located between the sixth lens 6 and the seventh lens 7.

[0034] As an improvement of the technical solution, the refractive index of the optical glass is expressed as Nd, and the Abbe number of the optical glass is Vd: The material properties of the first lens 1 are 1.5 < Nd < 1.7, and the Abbe number is 25 < Vd < 45. The material properties of the second lens 2 are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60. The material properties of the third lens 3 are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60. The material properties of the fourth lens 4 are 1.55 < Nd < 1.75, and the Abbe number is 20 < Vd < 40. The material properties of the fifth lens 5 are 1.5 < Nd < 1.7, and the Abbe number is 20 < Vd < 40. The material properties of the sixth lens 6 are 1.8 < Nd < 2.0, and the Abbe number is 35 < Vd < 55. The material properties of the seventh lens 7 are 1.8 < Nd < 2.0, and the Abbe number is 25 < Vd < 45. The material properties of the eighth lens 8 are 1.7 < Nd < 1.9, and the Abbe number is 20 < Vd < 40. The material properties of the ninth lens 9 are 1.75 < Nd < 1.95, and the Abbe number is 40 < Vd < 60. The material properties of the tenth lens 10 are 1.7 < Nd < 1.9, and the Abbe number is 20 < Vd < 40.

[0035] As an improvement of the technical solution, the focal length of the lens is set as f0, and the focal length of the cemented fifth lens 5 and sixth lens 6 is f56. The cemented fifth lens 5 and sixth lens 6 satisfy the following relationship: The absolute value of the focal length of the cemented fifth lens 5 and sixth lens 6 is greater than 3 times the lens focal length and less than 6 times the lens focal length: 3f0 < |f56| < 6f0.

[0036] As an improvement of the technical solution, the focal length of the lens is set as f0, and the focal length of the cemented seventh lens 7 and eighth lens 8 is f78. The cemented seventh lens 7 and eighth lens 8 satisfy the following relationship: The absolute value of the focal length of the cemented seventh lens 7 and eighth lens 8 is greater than 1 times the lens focal length and less than 3 times the lens focal length: f0 < f78 < 3f0.

[0037] As an improvement of the technical solution, the cemented lens composed of the seventh lens 7 and the eighth lens 8 is an optical component that moves along the optical axis. The moving distance of the cemented lens is between 0 and 20 mm. Moving the cemented lens can focus the lens, and the focusing range is from 20 mm to infinity.

[0038] In this embodiment, as an improvement of the technical solution, the parameters of the lens are as follows:

[0039]

[0040] The first lens 1 is a meniscus-type negative lens, the radius of curvature of the convex surface of the first lens 1 is 47.00mm, the radius of curvature of the concave surface of the first lens 1 is 27.50mm, the thickness of the front and back surfaces of the first lens 1 are both 2.00, the refractive index of the first lens 1 is 1.6, the aberration of the first lens 1 is 36, the convex surface Semi-Diameter value of the first lens 1 is 20.00mm, and the concave surface Semi-Diameter value of the first lens 1 is 17.00mm; the second lens 2 is a meniscus-type positive lens, the radius of curvature of the convex surface of the second lens 2 is 34.00mm, the radius of curvature of the concave surface of the second lens 2 is 72.00mm, the convex surface Thickness value of the second lens 2 is 4.80, and the second lens 2 The concave surface Thickness value of the second lens 2 is 0.20, the refractive index of the second lens 2 is 1.8, the aberration of the second lens 2 is 50, the convex surface Semi-Diameter value of the second lens 2 is 18.00mm, and the concave surface Semi-Diameter value of the second lens 2 is 17.00mm; the third lens 3 is a meniscus positive lens, the curvature radius of the third lens 3 close to the object is 37.00mm, the curvature radius of the reverse surface of the third lens 3 is 180.00mm, the Thickness value of the third lens 3 close to the object is 5.00, the Thickness value of the reverse surface of the third lens 3 is 1.00, the refractive index of the third lens 3 is 1.80, the aberration of the third lens 3 is 50, the Semi-Diameter value of the third lens 3 close to the object is 16.50mm, and the Semi-Diameter value of the reverse surface of the third lens 3 is 15.00mm; The fourth lens 4 is a meniscus negative lens, the curvature radius of the convex surface of the fourth lens 4 is infinity, the curvature radius of the concave surface of the fourth lens 4 is 29.00mm, the convex surface Thickness value of the fourth lens 4 is 2.00, the concave surface Thickness value of the fourth lens 4 is 4.36, the refractive index of the fourth lens 4 is 1.6, the aberration of the fourth lens 4 is 36, the convex surface Semi-Diameter value of the fourth lens 4 is 15.00mm, and the concave surface Semi-Diameter value of the fourth lens 4 is 12.70mm; the fifth lens 5 is a double concave negative lens, the curvature radius of the front surface of the fifth lens 5 is -60.00mm, the curvature radius of the back surface of the fifth lens 5 is 80.00mm, the front surface Thickness value of the fifth lens 5 is 2.00, the back surface Thickness value of the fifth lens 5 is 5.00, the refractive index of the fifth lens 5 is 1.88, the aberration of the fifth lens 5 is 40, and the fifth lens 5 The Semi-Diameter values ​​of both the front and back sides are 12.70 mm; the sixth lens 6 is a double convex positive lens, and the front curvature radius of the sixth lens 6 is -80.00mm, the back curvature radius of the sixth lens 6 is infinity, the front Thickness value of the sixth lens 6 is 1.00, the back Thickness value of the sixth lens 6 is 13.58, the refractive index of the sixth lens 6 is 1.88, the aberration of the sixth lens 6 is 40, the front Semi-Diameter value of the sixth lens 6 is 12.70mm, and the back Semi-Diameter value of the sixth lens 6 is 12.40mm; the seventh lens 7 is a double convex positive lens, the front curvature radius of the seventh lens 7 is 40.00mm, the back curvature radius of the seventh lens 7 is -45.00mm, the front Thickness value of the seventh lens 7 is 4.20, the back Thickness value of the seventh lens 7 is 1.00, the refractive index of the seventh lens 7 is 1.9, the aberration of the seventh lens 7 is 37, and the Semi-Diameter values ​​of the front and back sides of the seventh lens 7 are both 11.60mm; The eighth lens 8 is a double concave negative lens, the front curvature radius of the eighth lens 8 is 45.00 mm, the back curvature radius of the eighth lens 8 is infinity, the front thickness of the eighth lens 8 is 7.14, the back thickness of the eighth lens 8 is 7.00, the refractive index of the eighth lens 8 is 1.75, the aberration of the eighth lens 8 is 28, the front Semi-Diameter value of the eighth lens 8 is 11.50 mm, and the back Semi-Diameter value of the eighth lens 8 is 15.00 mm; the ninth lens 9 is a plano-convex positive lens, the curvature radius of the ninth lens 9 close to the object is -50 mm, the curvature radius of the ninth lens 9 away from the object is -24.00 mm, the thickness of the ninth lens 9 close to the object is 10.10, and the ninth lens 9 The thickness value far from the object is 1.60, the refractive index of the ninth lens 9 is 1.8, the aberration of the ninth lens 9 is 46, the front Semi-Diameter value of the ninth lens 9 is 15.00mm, and the convex Semi-Diameter value of the ninth lens 9 is 14.50mm; the tenth lens 10 is a meniscus negative lens, the curvature radius of the concave surface (front surface) of the tenth lens 10 close to the object is -45mm, the concave thickness value of the tenth lens 10 is 16.27, the refractive index of the tenth lens 10 is 1.75, the aberration of the tenth lens 10 is 28, and the concave Semi-Diameter value of the tenth lens 10 is 16.50mm; wherein the position of the light stop 11 is set between the sixth lens 6 and the seventh lens 7, the spacing between the sixth lens 6 and the seventh lens 7 is set between 0-20MM, and the width of the light stop 11 is adjustable. .

[0041] In this way, as attached Figure 2 and attached Figure 3As shown, the fifth lens 5 and the sixth lens 6 are glued together, the seventh lens 7 and the eighth lens 8 are glued together, the light barrier 11 is located between the sixth lens 6 and the seventh lens 7, and the seventh lens 7 and the eighth lens 8 in a glued state are moved along the central axis to achieve the adjustment change of the lens focal length.

[0042] The utility model realizes a lens assembly adapted to a variety of focal lengths by setting a variety of lenses of different types, different curvature radii, different refractive indices and different aberrations, and by a reasonable combination and arrangement method. It can be commonly used in most lenses on the market, and its focal length has a variety of variations, including between 35MM-100MM focal lengths. Moreover, compared with the ordinary lens structure on the market, the lens structure of this invention is simpler, and the number of lenses used is less, which is conducive to reducing the cost of the lens and enhancing market competitiveness. The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. For technicians in this field, the utility model can have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A digital camera lens assembly structure, including a lens optical structure, characterized in that: The lens optical structure has 8 groups and 10 lenses, which successively include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens from the object side. Among them, the fifth lens and the sixth lens are cemented, and the seventh lens and the eighth lens are cemented; The first lens is a meniscus negative lens, the second lens is a meniscus positive lens, the third lens is a meniscus positive lens, the fourth lens is a meniscus negative lens, the fifth lens is a biconcave negative lens, the sixth lens is a biconvex positive lens, the seventh lens is a biconvex positive lens, the eighth lens is a biconcave negative lens, the ninth lens is a plano-convex positive lens, and the tenth lens is a meniscus negative lens; The diaphragm position is between the sixth lens and the seventh lens.

2. The structure of a digital camera lens assembly according to claim 1, wherein The material properties of the first lens are 1.5 < Nd < 1.7, and the Abbe number is 25 < Vd < 45; The material properties of the second lens are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60; The material properties of the third lens are 1.7 < Nd < 1.9, and the Abbe number is 40 < Vd < 60; The material properties of the fourth lens are 1.55 < Nd < 1.75, and the Abbe number is 20 < Vd < 40; The material properties of the fifth lens are 1.5 < Nd < 1.7, and the Abbe number is 20 < Vd < 40; The material properties of the sixth lens are 1.8 < Nd < 2.0, and the Abbe number is 35 < Vd < 55; The material properties of the seventh lens are 1.8 < Nd < 2.0, and the Abbe number is 25 < Vd < 45; The material properties of the eighth lens are 1.7 < Nd < 1.9, and the Abbe number is 20 < Vd < 40; The material properties of the ninth lens are 1.75 < Nd < 1.95, and the Abbe number is 40 < Vd < 60; The material properties of the tenth lens are 1.7 < Nd < 1.9, and the Abbe number is 20 < Vd < 40.

3. A digital camera lens assembly structure according to claim 1, characterized in that: Set the focal length of the lens as f0, and the focal length of the cemented fifth lens and sixth lens is f56; The cemented fifth lens and sixth lens satisfy the following relational formula: The absolute value of the focal length of the cemented fifth lens and sixth lens is greater than 3 times the lens focal length and less than 6 times the lens focal length: 3f0 < |f56| < 6f0.

4. The structure of a digital camera lens assembly according to claim 1, wherein Set the focal length of the lens as f0, and the focal length of the cemented seventh lens and eighth lens is f78; The cemented seventh lens and eighth lens satisfy the following relational formula: The absolute value of the focal length of the cemented seventh lens and eighth lens is greater than 1 times the lens focal length and less than 3 times the lens focal length: f0 < f78 < 3f0.

5. The digital camera lens assembly structure according to claim 1, characterized in that: The cemented lens formed by the seventh lens and the eighth lens is an optical component that moves along the optical axis direction, and the moving distance of this cemented lens is between 0 and 20 mm; Moving the cemented lens can focus the lens, and the focusing range is from 20 mm to infinity.

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