A full-spherical auto-focus optical lens

Abstract

The invention discloses a full-spherical autofocus optical lens, which is composed of a negative optical power transmission group G1, a negative optical power transmission group G2, a positive optical power transmission group G3, an aperture stop, a positive optical power transmission group G4, a positive optical power transmission group G5, and a detector component module, which are arranged in sequence from the object side to the image side; the detector component module comprises a filter, a protection window and an image plane, which are arranged in sequence from the object side to the image side. The lens has good imaging characteristics, and the whole system has good transfer functions and image points. The working wavelength is 486-656nm, the telephoto distance is infinity, the close-up distance is 0.3m, the working image plane can reach 9.2mm, the focusing stroke is short, only 0.28mm is needed, and the ability of fast focusing is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of optical imaging, and in particular relates to a full-spherical auto-focus optical lens. Background Art

[0002] In recent years, the demand for micro-single cameras in the photography market has been rapidly expanding. Based on the advantages of good portability and high performance of micro-single cameras, along with the continuous updating and development of mature high-precision CMOS process device technology, micro-single cameras also have good high-quality imaging quality. Therefore, its user base is also increasing, and a variety of different demands have also been generated for various shooting scenes. There is still a gap in the focal length range of original matching lenses, especially full-spherical autofocus optical lenses. The existing lens prices are generally high, and not all photography consumers can accept them. Micro-single camera lenses are the same as SLR camera lenses. Consumers hope that they have high performance and high cost performance. Therefore, in order to reduce its cost and increase its zoom performance, a full-spherical autofocus optical lens is proposed here. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies, a full-spherical autofocus optical lens is proposed, which has good imaging characteristics. The whole system has good transfer functions and image points, the working wavelength is 486-656nm, the telephoto distance is infinity, the close-up distance is 0.3m, the working image surface can reach 9.2mm, the focusing stroke is short, only 0.28mm, and the ability to quickly focus is achieved.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a global autofocus optical lens. It is composed of a transmission group G1, a transmission group G2, a transmission group G3, an aperture stop, 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 negative optical power, the transmission group G3 has a positive 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 two lenses, which are: a first positive lens made of crown glass and a first negative lens made of crown glass from the object side to the image side;

[0007] The transmission group G2 is composed of three lenses, which are: the second negative lens made of crown glass, the second positive lens made of flint glass and the third negative lens made of crown glass from the object side to the image side.

[0008] The transmission group G3 is composed of 6 lenses, which are: a fourth negative lens made of flint glass, a third positive lens made of flint glass, a fourth positive lens made of crown glass, a fifth positive lens made of crown glass, a sixth positive lens made of crown glass and a fifth negative lens made of flint glass from the object side to the image side.

[0009] The transmission group G4 is composed of 5 lenses, which are, from the object side to the image side: the seventh positive lens made of crown glass, the eighth positive lens made of crown glass, the ninth positive lens made of flint glass, the sixth negative lens made of crown glass and the tenth positive lens made of flint glass;

[0010] The transmission group G5 consists of one lens, which is the eleventh positive lens made of crown glass;

[0011] The detector assembly module includes filters, a protective window and an image plane which are arranged in sequence from the object side to the image side.

[0012] According to the spherical autofocus 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 entire optical system when the object distance is infinite is (-5.07, -3.98);

[0013] The ratio of the focal length of the transmission group G2 to the focal length of the entire optical system when the object distance is infinite is in the range of (-3.01, -1.66);

[0014] The ratio of the focal length of the transmission group G3 to the focal length of the entire optical system when the object distance is infinite is in the range of (2.08, 2.43);

[0015] The ratio of the focal length of the transmission group G4 to the focal length of the entire optical system when the object distance is infinite is in the range of (1.05, 3.24);

[0016] The ratio of the focal length of the transmission group G5 to the focal length of the entire optical system when the object distance is infinite is in the range of (3.66, 3.82).

[0017] According to the spherical auto-focus optical lens of the present invention, a further preferred technical solution is that the lenses in the transmission group G1, the transmission group G2, the transmission group G3, the transmission group G4 and the transmission group G5 are all spherical lenses.

[0018] According to the spherical autofocus optical lens of the present invention, a further preferred technical solution is that the fifth negative lens in the transmission group G3 is a moving component.

[0019] According to the spherical autofocus optical lens of the present invention, a further preferred technical solution is: the transmission group G1 is composed of two groups of single lenses; the transmission group G2 is composed of three groups of single lenses; in the transmission group G3, the fourth negative lens and the third positive lens constitute a double cemented lens, and the fourth positive lens, the fifth positive lens, the sixth positive lens and the fifth negative lens are single lenses; in the transmission group G4, the sixth negative lens and the tenth positive lens constitute a double cemented lens, and the seventh positive lens, the eighth positive lens and the ninth positive lens are single lenses; in the transmission group G5, the eleventh positive lens is a single lens.

[0020] Compared with the prior art, the technical solution of the present invention has the following advantages / benefits:

[0021] 1. The working wavelength of the spherical auto-focus optical lens of the present invention is 486-656nm, the telephoto distance is infinity, the close-up distance can reach 0.3m, and the working image surface can reach 9.2mm.

[0022] 2. All lenses of the transmission group G1, transmission group G2, transmission group G3, transmission group G4 and transmission group G5 of the full-spherical auto-focus optical lens of the present invention are spherical lenses, which has good process feasibility and effectively reduces its manufacturing cost.

[0023] 3. The spherical autofocus optical lens of the present invention has good imaging characteristics, and the whole system has good transfer function and image points.

[0024] 4. When the object distance of the full-spherical auto-focus optical lens of the present invention changes from infinity to close-up distance, the focusing stroke is short, requiring only 0.28 mm, thereby achieving the ability of fast focusing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 The present invention is a structural schematic diagram of a full-spherical auto-focus optical lens.

[0027] Figure 2 The present invention discloses a modulation transfer function curve diagram of a spherical automatic focusing optical lens at infinity.

[0028] Figure 3 The present invention discloses a modulation transfer function curve diagram of a spherical automatic focusing optical lens at a close shooting distance.

[0029] Figure 4The present invention discloses a transverse light fan diagram of a spherical automatic focusing optical lens at infinity.

[0030] Figure 5 The present invention discloses a transverse light fan diagram of a spherical automatic focusing optical lens at a close shooting distance.

[0031] Figure 6 The present invention discloses a point arrangement diagram of a spherical automatic focusing optical lens at infinity.

[0032] Figure 7 The present invention discloses a point arrangement diagram of a spherical automatic focusing optical lens at a close shooting distance.

[0033] Figure 8 The present invention discloses a relative illumination curve diagram of a spherical automatic focusing optical lens at infinity.

[0034] Fig. 9 The present invention discloses a relative illumination curve diagram of a spherical automatic focusing optical lens at a close shooting distance.

[0035] The markings in the figure are: 1. first positive lens, 2. first negative lens, 3. second negative lens, 4. second positive lens, 5. third negative lens, 6. fourth negative lens, 7. third positive lens, 8. fourth positive lens, 9. fifth positive lens, 10. sixth positive lens, 11. fifth negative lens, 12. seventh positive lens, 13. eighth positive lens, 14. ninth positive lens, 15. sixth negative lens, 16. tenth positive lens, 17. eleventh positive lens, 18. filter, 19. protective window, 20. image plane. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] Example:

[0039] Figure 1This is a schematic diagram of the layout of a full-spherical autofocus optical lens of the present invention. From the object side to the image side, 16 optical elements (lenses) form transmission group G1, transmission group G2, transmission group G3, transmission group G4, and transmission group G5.

[0040] The ratio range of the focal length of the transmission group G1 and the focal length of the entire optical system (referring to the spherical autofocus optical lens) when the object distance is infinite is (-5.07, -3.98); the ratio range of the focal length of the transmission group G2 and the focal length of the entire optical system when the object distance is infinite is (-3.01, -1.66); the ratio range of the focal length of the transmission group G3 and the focal length of the entire optical system when the object distance is infinite is (2.08, 2.43); the ratio range of the focal length of the transmission group G4 and the focal length of the entire optical system when the object distance is infinite is (1.05, 3.24); the ratio range of the focal length of the transmission group G5 and the focal length of the entire optical system when the object distance is infinite is (3.66, 3.82).

[0041] The transmission group G1 is a transmission group with negative optical power, and is composed of a first positive lens 1 made of crown glass and a first negative lens 2 made of crown glass, which are arranged in sequence from the object side to the image side. The light entering the transmission group G1 is diverged by the transmission group G1 and then enters the transmission group G2.

[0042] The transmission group G2 is a transmission group with negative optical power, and is composed of a second negative lens 3 made of crown glass, a second positive lens 4 made of flint glass, and a third negative lens 5 made of crown glass, which are arranged in sequence from the object side to the image side. The light from the transmission group G1 is diverged by the transmission group G2 and then enters the transmission group G3.

[0043] The transmission group G3 is a transmission group with positive power, and is composed of a fourth negative lens 6 made of flint glass, a third positive lens 7 made of flint glass, a fourth positive lens 8 made of crown glass, a fifth positive lens 9 made of crown glass, a sixth positive lens 10 made of crown glass, and a fifth negative lens 11 made of flint glass, which are arranged in sequence from the object side to the image side. The light from the transmission group G2 is converged by the transmission group G3 and then enters the transmission group G4.

[0044] The transmission group G4 is a transmission group with positive power, and is composed of a seventh positive lens 12 made of crown glass, an eighth positive lens 13 made of crown glass, a ninth positive lens 14 made of flint glass, a sixth negative lens 15 made of crown glass, and a tenth positive lens 16 made of flint glass, which are arranged in sequence from the object side to the image side. The light from the transmission group G3 is converged by the transmission group G4 and then enters the transmission group G5.

[0045] The transmission group G5 is a transmission group with positive refractive power, and the transmission group G5 is composed of an eleventh positive lens 17 made of crown glass. The light from the transmission group G4 is converged by the transmission group G5 and then enters the image plane.

[0046] The physical parameters of each lens in this embodiment meet the data requirements shown in Table 1:

[0047] Table 1 Physical parameters of each lens in this embodiment

[0048]

[0049] This embodiment is realized by the following technical measures: the working wavelength of the optical lens is 486-656nm, the telephoto distance is infinity, the close-up distance is 0.3m, 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 a full-spherical surface, a large target surface, good process feasibility, fast focusing, and good imaging quality.

[0050] Figure 2 , Figure 3 The modulation transfer function curves of the full spherical auto-focus optical lens designed in this embodiment at infinity and close shooting distances are given. It can be seen that the contrast of the full spherical auto-focus optical lens at infinity and close shooting distances is relatively high, reaching 100lp / mm.

[0051] Figure 4 , Figure 5 The ray fan diagram Ray Fan of the spherical auto-focus optical lens designed in this embodiment at infinity and close shooting distance is given. It can be seen that the ray aberration of the spherical auto-focus optical lens at infinity and close shooting distance is relatively small.

[0052] Figure 6 , Figure 7 The spot diagram of the full-spherical auto-focus optical lens designed in this embodiment at infinity and close shooting distance is given. It can be seen that the image spot of the full-spherical auto-focus optical lens at infinity and close shooting distance is small and has good consistency.

[0053] Figure 8 , Fig. 9 The relative illumination curves of the full spherical auto-focus optical lens designed in this embodiment at infinity and close shooting distances are given. It can be seen that the relative illumination curves of the full spherical auto-focus optical lens at infinity and close shooting distances are both better than 0.75.

[0054] 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.

[0055] 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.

[0056] 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. A spherical autofocus optical lens, characterized in that: It is composed of a transmission group G1, a transmission group G2, a transmission group G3, an aperture stop, 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 negative optical power, the transmission group G3 has a positive 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 two lenses, which are: a first positive lens made of crown glass and a first negative lens made of crown glass from the object side to the image side; The transmission group G2 is composed of three lenses, which are: the second negative lens made of crown glass, the second positive lens made of flint glass and the third negative lens made of crown glass from the object side to the image side. The transmission group G3 is composed of 6 lenses, which are: a fourth negative lens made of flint glass, a third positive lens made of flint glass, a fourth positive lens made of crown glass, a fifth positive lens made of crown glass, a sixth positive lens made of crown glass and a fifth negative lens made of flint glass from the object side to the image side. The transmission group G4 is composed of 5 lenses, which are, from the object side to the image side: the seventh positive lens made of crown glass, the eighth positive lens made of crown glass, the ninth positive lens made of flint glass, the sixth negative lens made of crown glass and the tenth positive lens made of flint glass; The transmission group G5 consists of one lens, which is the eleventh positive lens made of crown glass; The detector assembly module includes filters, a protective window and an image plane which are arranged in sequence from the object side to the image side.

2. The spherical 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 entire optical system when the object distance is infinite is in the range of (-5.07, -3.98); The ratio of the focal length of the transmission group G2 to the focal length of the entire optical system when the object distance is infinite is in the range of (-3.01, -1.66); The ratio of the focal length of the transmission group G3 to the focal length of the entire optical system when the object distance is infinite is in the range of (2.08, 2.43); The ratio of the focal length of the transmission group G4 to the focal length of the entire optical system when the object distance is infinite is in the range of (1.05, 3.24); The ratio of the focal length of the transmission group G5 to the focal length of the entire optical system when the object distance is infinite is in the range of (3.66, 3.82).

3. The spherical auto-focus optical lens according to claim 1, characterized in that: The lenses in the transmission group G1 , the transmission group G2 , the transmission group G3 , the transmission group G4 , and the transmission group G5 are all spherical lenses.

4. The spherical auto-focus optical lens according to claim 1, characterized in that: The fifth negative lens in the transmission group G3 is a moving component.

5. The spherical auto-focus optical lens according to claim 1, characterized in that: The transmission group G1 consists of two groups of single lenses; the transmission group G2 consists of three groups of single lenses; in the transmission group G3, the fourth negative lens and the third positive lens constitute a doublet lens, and the fourth positive lens, the fifth positive lens, the sixth positive lens and the fifth negative lens are single lenses; in the transmission group G4, the sixth negative lens and the tenth positive lens constitute a doublet lens, and the seventh positive lens, the eighth positive lens and the ninth positive lens are single lenses; in the transmission group G5, the eleventh positive lens is a single lens.

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