An autofocus optical lens with large aperture, large target surface, high resolution and close-up photography

Abstract

The invention discloses an autofocus optical lens with large aperture, large target surface, high resolution and close-up photography. The lens comprises a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4, a transmission group G5 and a detector component module which are arranged in sequence from the object side to the image side. The transmission group G1 has a negative optical focal length, the transmission group G2 has a positive optical focal length, the transmission group G3 has a negative optical focal length, the transmission group G4 has a positive optical focal length, and the transmission group G5 has a positive optical focal length. The detector component module comprises a protection window, a filter and an image plane which are arranged from the object side to the image side. The aperture stop is located between the transmission group G3 and the transmission group G4. The lens has the characteristics of large aperture, large target surface and high resolution. The close-up distance can reach 0.1m, the working wavelength is 435nm-635nm, the telephoto distance is infinity, and when the object distance changes from infinity to the close-up distance, the focusing stroke is short, requiring only 1.9mm, the zoom is fast, the lens is short, the application range is wide, and the shooting effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to an auto-focus optical lens with large aperture, large target surface, high resolution and close-up photography. Background Art

[0002] In recent years, in the photography market, micro-single cameras are rapidly expanding, thanks to the high performance and portability of micro-single cameras. The cancellation of the reflector assembly makes the micro-single camera small, light and portable. At the same time, thanks to the mature technology of high-precision CMOS, the micro-single camera also has excellent high-quality imaging quality. The user group is constantly increasing, and there are also various demands for various shooting scenes. The focal length range of the original matching lens is still vacant, especially the large aperture, large target surface, high resolution autofocus optical lens. The lens price is very expensive, and not all photography consumers can accept it. The micro-single camera lens is the same as the SLR camera lens. Consumers hope that it has high performance and high cost performance. The present invention can achieve clear imaging of targets of different sizes at infinity and close shooting distances on the object side through the cooperation of 5 groups of optical lenses, the clever combination of optical materials and the cooperation of optical lens intervals. At the same time, during the zooming process, the image quality reaches the quality of the imaging lens of the fixed-focus optical lens. It can be foreseen that the large aperture, large target surface, high resolution, close shooting distance of up to 0.1m autofocus optical lens of the present invention has a wide range of application prospects. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies, an autofocus optical lens with large aperture, large target surface, high resolution and close-up is proposed. The lens has the characteristics of large aperture, large target surface and high resolution. The close-up distance can reach 0.1m, the working wavelength is 435nm-635nm, the telephoto distance is infinity, and when the object distance changes from infinity to the close-up distance, the focusing stroke is short, only 1.9mm, the zoom is fast, the lens is short, the application range is wide, and the shooting effect is good.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is to provide an autofocus optical lens with large aperture, large target surface, high resolution and close-up. It is composed of a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4, a transmission group G5 and a detector assembly module arranged in sequence from the object side to the image side.

[0005] The transmission group G1 has a negative optical power, the transmission group G2 has a positive optical power, the transmission group G3 has a negative optical power, the transmission group G4 has a positive optical power, and the transmission group G5 has a positive optical power;

[0006] The transmission group G1 is composed of 4 transmission lenses, which are, from the object side to the image side, a first negative lens made of crown glass, a second negative lens made of crown glass, a third negative lens made of crown glass, and a fourth negative lens made of crown glass;

[0007] The transmission group G2 is composed of a group of doublet lenses and a group of single lenses, which are a total of 3 transmission lenses. From the object side to the image side, the transmission group G2 is composed of a first positive lens made of flint glass, a second positive lens made of crown glass, and a third positive lens made of flint glass.

[0008] The transmission group G3 is composed of three transmission lenses, which are, from the object side to the image side, a fifth negative lens made of flint glass, a fourth positive lens made of crown glass, and a sixth negative lens made of flint glass;

[0009] The transmission group G4 is composed of 4 transmission lenses, which are, from the object side to the image side, a fifth positive lens made of plastic, a sixth positive lens made of crown glass, a seventh negative lens made of flint glass, and a seventh positive lens made of crown glass;

[0010] The transmission group G5 is composed of two transmission lenses, which are, from the object side to the image side, an eighth positive lens made of flint glass and a ninth positive lens made of flint glass;

[0011] The detector assembly module consists of a protective window, a filter, and an image plane arranged from the object side to the image side;

[0012] The aperture stop is located between the transmission group G3 and the transmission group G4.

[0013] According to the large aperture, large target surface, high resolution, close-up auto-focus optical lens of the present invention, a further preferred technical solution is: the ratio range of the focal length of the transmission group G1 and the focal length of the optical system when the object distance is infinite is (-2.62, -1.16);

[0014] The ratio of the focal length of the transmission group G2 to the focal length of the optical system at infinite object distance is in the range of (2.11, 2.53);

[0015] The ratio range of the focal length of the transmission group G3 and the focal length of the optical system at infinite object distance is (-3.05, -2.66);

[0016] The ratio of the focal length of the transmission group G4 to the focal length of the optical system at infinite object distance is in the range of (2.22, 3.19);

[0017] The ratio of the focal length of the transmission group G5 to the focal length of the optical system at infinite object distance is in the range of (3.18, 3.56).

[0018] According to the large aperture, large target surface, high resolution, close-up autofocus optical lens described in the present invention, a further preferred technical solution is that the first to fourth positive lenses, the sixth to ninth positive lenses and the first to seventh negative lenses are all spherical lenses, and the fifth positive lens is a double-sided aspherical lens.

[0019] According to the large aperture, large target surface, high resolution, close-up autofocus optical lens of the present invention, a further preferred technical solution is that the sixth positive lens in the transmission group G4 is a moving component.

[0020] According to the large aperture, large target surface, high resolution and close-up autofocus optical lens of the present invention, a further preferred technical solution is: in the transmission group G2, the first positive lens and the second positive lens constitute a double cemented lens; in the transmission group G3, the fourth positive lens and the sixth negative lens constitute a double cemented lens; in the transmission group G4, the seventh negative lens and the seventh positive lens constitute a double cemented lens.

[0021] Compared with the prior art, the technical solution of the present invention has the following advantages / benefits:

[0022] 1. The lens of the present invention has the characteristics of large aperture, large target surface and high resolution. The close-up distance can reach 0.1m, the working wavelength is 435nm-635nm, the telephoto distance is infinity, and when the object distance changes from infinity to the close-up distance, the focusing stroke is short, only 1.9mm, the zoom is fast, the lens is short, the application range is wide, and the shooting effect is good.

[0023] 2. The lens of the present invention is composed of a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4 and a transmission group G5, all of which use 16 lenses made of glass lenses. Higher quality is achieved with a smaller number, and the transmittance of the optical system is also higher. Except for the fifth positive lens, all lenses are spherical and have good imaging characteristics. The entire system has a good transfer function and image point. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The present invention is a schematic structural diagram of an auto-focus optical lens with large aperture, large target surface, high resolution and close-up photography.

[0026] Figure 2The present invention is a modulation transfer function curve diagram of an automatic focus optical lens with large aperture, large target surface, high resolution and close-up photography at infinity.

[0027] Figure 3 The present invention discloses a modulation transfer function curve diagram of an auto-focus optical lens with large aperture, large target surface, high resolution and close-up photography at a close-up distance.

[0028] Figure 4 The invention discloses a transverse light fan diagram of an autofocus optical lens with large aperture, large target surface, high resolution and close-up photography at infinity.

[0029] Figure 5 The invention discloses a transverse light fan diagram of an autofocus optical lens with large aperture, large target surface and high resolution for close-up photography at a close-up distance.

[0030] Figure 6 The present invention discloses a point arrangement diagram of an automatic focusing optical lens with large aperture, large target surface, high resolution and close-up photography at infinity.

[0031] Figure 7 The present invention discloses a point arrangement diagram of an auto-focus optical lens with large aperture, large target surface, high resolution and close-up photography at a close-up distance.

[0032] The markings in the figure are: 1. first negative lens, 2. second negative lens, 3. third negative lens, 4. fourth negative lens, 5. first positive lens, 6. second positive lens, 7. third positive lens, 8. fifth negative lens, 9. fourth positive lens, 10. sixth negative lens, 11. fifth positive lens, 12. sixth positive lens, 13. seventh negative lens, 14. seventh positive lens, 15. eighth positive lens, 16. ninth positive lens, 17. protective window, 18. filter, 19. image plane. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in the subsequent drawings.

[0035] Example:

[0036] Figure 1 The schematic diagram of the layout of a large aperture, large target surface, high resolution, close-up autofocus optical lens of the present invention is composed of a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4, a transmission group G5 and a detector assembly module which are sequentially arranged from the object side to the image side.

[0037] The ratio range of the focal length of the transmission group G1 and the focal length of the optical system at infinite object distance is (-2.62, -1.16); the range of the focal length of the transmission group G2 and the focal length of the optical system at infinite object distance is (2.11, 2.53); the range of the focal length of the transmission group G3 and the focal length of the optical system at infinite object distance is (-3.05, -2.66); the range of the focal length of the transmission group G4 and the focal length of the optical system at infinite object distance is (2.22, 3.19); the range of the focal length of the transmission group G5 and the focal length of the optical system at infinite object distance is (3.18, 3.56).

[0038] The transmission group G1 is a transmission group with negative optical power, and the transmission group G1 includes, from the object side to the image side, a first negative lens 1 made of crown glass, a second negative lens 2 made of crown glass, a third negative lens 3 made of crown glass, and a fourth negative lens 4 made of crown glass. Light entering the transmission group G1 is diverged by the transmission group G1 and then enters the transmission group G2.

[0039] The transmission group G2 is a transmission group with positive power. The transmission group G2 is composed of a group of doublets and a group of singlets, which are a total of 3 transmissions. The transmission group G2 is composed of a first positive lens 5 made of flint glass, a second positive lens 6 made of crown glass, and a third positive lens 7 made of flint glass from the object side to the image side. In the transmission group G2, the first positive lens 5 and the second positive lens 6 form a doublet. The light from the transmission group G1 is converged by the transmission group G2 and then enters the transmission group G3.

[0040] The transmission group G3 is a transmission group with negative optical power. The transmission group G3 is composed of a group of single lenses and a group of doublet lenses, totaling 3 transmissions. The transmission group G3 is composed of a fifth negative lens 8 made of flint glass, a fourth positive lens 9 made of crown glass, and a sixth negative lens 10 made of flint glass from the object side to the image side. In the transmission group G3, the fourth positive lens 9 and the sixth negative lens 10 form a doublet lens. The light from the transmission group G2 is diverged by the transmission group G3 and then enters the transmission group G4.

[0041] Transmission group G4 is a transmission group with positive power. Transmission group G4 is composed of a group of doublets and two groups of singlets, totaling 4 lenses. Transmission group G4 is composed of a fifth positive lens 11 made of plastic, a sixth positive lens 12 made of crown glass, a seventh negative lens 13 made of flint glass, and a seventh positive lens 14 made of crown glass from the object side to the image side. In transmission group G4, the seventh negative lens 13 and the seventh positive lens 14 form a doublet. Light from transmission group G3 is converged by transmission group G4 and then enters transmission group G5.

[0042] The transmission group G5 is a transmission group with positive refractive power. The transmission group G5 is composed of two groups of single lenses, a total of 2 transmission lenses. The transmission group G5 is composed of an eighth positive lens 15 made of flint glass and a ninth positive lens 16 made of flint glass from the object side to the image side. The light from the transmission group G4 is converged by the transmission group G5 and then enters the image plane.

[0043] The detector assembly module is composed of a protection window 17, a filter 18 and an image plane 19 arranged from the object side to the image side; the aperture stop is located between the transmission group G3 and the transmission group G4.

[0044] The physical parameters of each lens in this embodiment meet the data requirements shown in Table 1:

[0045] Table 1 Physical parameters of each lens in this embodiment

[0046]

[0047] The equation for an aspheric surface is as follows:

[0048]

[0049] The definition of aspherical shape is explained below:

[0050] y: radial coordinate from the optical axis.

[0051] z: The offset in the direction of the optical axis starting from the intersection point of the aspherical surface and the optical axis.

[0052] r: The radius of curvature of the reference sphere of the aspheric surface.

[0053] k is the cone constant, A4, A6, A8, A10, A12 are the 4th, 6th, 8th, 10th, 12th aspheric coefficients.

[0054] The surface 21 and the surface 22 of the fifth positive lens 11 are aspherical surfaces. In the following table, the 4th, 6th, 8th, 10th, and 12th order aspherical coefficients A4, A6, A8, A10, and A12 of the aspherical surface and the cone constant k are shown together, and E in the table is a scientific notation symbol.

[0055] Table 2 Aspheric parameters of this embodiment

[0056]

[0057] This embodiment is realized by the following technical measures: the working wavelength of the optical lens is 435nm-635nm, the telephoto distance is infinity, the close-up distance is 0.1m, the aperture is 1.4, and the target surface is 10.8mm. The light is emitted from the object surface and is imaged to the image surface after passing through the transmission group G1, the transmission group G2, the transmission group G3, the transmission group G4, and the transmission group G5. The present invention has the advantages of large aperture, strong blurring ability, large target surface, high resolution, short close-up distance, fast focusing, and good imaging quality.

[0058] Figure 2 , Figure 3 The modulation transfer function curves of the lens designed in this embodiment at infinity and close-up distances are given. It can be seen that the contrast of the lens at infinity and close-up distances is high, and the resolution is high, reaching 210lp / mm.

[0059] Figure 4 , Figure 5 The lateral light fan diagram of the lens designed in this embodiment at infinity and close shooting distance is given. It can be seen that the light aberration of the lens at infinity and close shooting distance is small.

[0060] Figure 6 , Figure 7 The spot diagram of the lens designed in this embodiment at infinity and close shooting distance is given. It can be seen that the image spot is small and has good consistency at infinity and close shooting distance.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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.

[0063] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An autofocus optical lens with large aperture, large target surface, high resolution and close-up photography, characterized in that: It consists of a transmission group G1, a transmission group G2, a transmission group G3, a transmission group G4, a transmission group G5 and a detector assembly module which are arranged in sequence from the object side to the image side. The transmission group G1 has a negative optical power, the transmission group G2 has a positive optical power, the transmission group G3 has a negative optical power, the transmission group G4 has a positive optical power, and the transmission group G5 has a positive optical power; The transmission group G1 is composed of 4 transmission lenses, which are, from the object side to the image side, a first negative lens made of crown glass, a second negative lens made of crown glass, a third negative lens made of crown glass, and a fourth negative lens made of crown glass; The transmission group G2 is composed of a group of doublet lenses and a group of single lenses, which are a total of 3 transmission lenses. From the object side to the image side, the transmission group G2 is composed of a first positive lens made of flint glass, a second positive lens made of crown glass, and a third positive lens made of flint glass. The transmission group G3 is composed of three transmission lenses, which are, from the object side to the image side, a fifth negative lens made of flint glass, a fourth positive lens made of crown glass, and a sixth negative lens made of flint glass; The transmission group G4 is composed of 4 transmission lenses, which are, from the object side to the image side, a fifth positive lens made of plastic, a sixth positive lens made of crown glass, a seventh negative lens made of flint glass, and a seventh positive lens made of crown glass; The transmission group G5 is composed of two transmission lenses, which are, from the object side to the image side, an eighth positive lens made of flint glass and a ninth positive lens made of flint glass; The detector assembly module consists of a protective window, a filter, and an image plane arranged from the object side to the image side; The aperture stop is located between the transmission group G3 and the transmission group G4.

2. The large aperture, large target surface, high resolution, close-up autofocus optical lens according to claim 1, characterized in that: The ratio of the focal length of the transmission group G1 to the focal length of the optical system when the object distance is infinite is in the range of (-2.62, -1.16); The ratio of the focal length of the transmission group G2 to the focal length of the optical system at infinite object distance is in the range of (2.11, 2.53); The ratio of the focal length of the transmission group G3 to the focal length of the optical system at infinite object distance is in the range of (-3.05, -2.66); The ratio of the focal length of the transmission group G4 to the focal length of the optical system at infinite object distance is in the range of (2.22, 3.19); The ratio of the focal length of the transmission group G5 to the focal length of the optical system at infinite object distance is in the range of (3.18, 3.56).

3. The large aperture, large target surface, high resolution, close-up auto-focus optical lens according to claim 1, characterized in that: The first to fourth positive lenses, the sixth to ninth positive lenses, and the first to seventh negative lenses are all spherical lenses, and the fifth positive lens is a double-sided aspherical lens.

4. The large aperture, large target surface, high resolution, close-up autofocus optical lens according to claim 1, characterized in that: The sixth positive lens in the transmission group G4 is a moving component.

5. The large aperture, large target surface, high resolution, close-up autofocus optical lens according to claim 1, characterized in that: In the transmission group G2, the first positive lens and the second positive lens constitute a doublet lens; in the transmission group G3, the fourth positive lens and the sixth negative lens constitute a doublet lens; in the transmission group G4, the seventh negative lens and the seventh positive lens constitute a doublet lens.

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