Wide-angle optical system and optical apparatus
The design of a four-lens structure solves the problem of multiple lenses and complex structure of wide-angle lenses, achieves a reduction in lens size and cost, and maintains good imaging quality within ±90 degrees.
Patent Information
- Application Number
- CN202423139735.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-09-06
- Filing Date
- 2024-12-18
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Existing wide-angle lenses have many lenses, complex structures, and are difficult and costly to debug.
It adopts a four-lens structure, including the first lens, the second lens, the third lens and the fourth lens, to achieve a field of view of 180 degrees to 190 degrees through multiple refraction and reflection of light, correct spherical aberration, coma, astigmatism and chromatic aberration, and reduce production costs.
The lens size is greatly reduced, the debugging difficulty and production cost are reduced, and at the same time, good image quality is maintained within ±90 degrees.
Smart Images
Figure CN223450246U_ABST
Abstract
Description
[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 6, 2024, with application number 202422197946.3 and application name “Wide-angle optical system and optical equipment”, the entire contents of which are incorporated by reference into the application. Technical Field
[0002] The utility model relates to the technical field of optics, in particular to a wide-angle optical system and optical equipment. Background Art
[0003] Currently, most photographic lenses utilize the Cooke three-element design or its improved versions. Improved ultra-wide-angle lens designs typically incorporate at least six elements. These complex designs and large size make it difficult to adjust for spherical aberration, aberration, astigmatism, and chromatic aberration, as well as the high cost. Consequently, ultra-wide-angle lenses remain expensive. Utility Model Content
[0004] The main purpose of the utility model is to provide a wide-angle optical system and optical equipment, aiming to solve the technical problems in the prior art that wide-angle lenses have many lenses, complex structures, and are difficult and costly to debug.
[0005] To achieve the above-mentioned object, the present invention provides a wide-angle optical system, which includes a lens and a photoelectric sensor. The lens includes the following arranged in sequence:
[0006] A first lens, the first lens comprising a first mirror surface and a second mirror surface, the first mirror surface is convex, and the second mirror surface is concave;
[0007] A second lens, the second lens comprising a third mirror surface and a fourth mirror surface, wherein the third mirror surface and the fourth mirror surface are both convex surfaces;
[0008] A third lens, the third lens comprising a fifth mirror surface and a sixth mirror surface, both of which are convex surfaces;
[0009] a fourth lens, the fourth lens including a seventh mirror surface and an eighth mirror surface, the seventh mirror surface is concave, and the eighth mirror surface is convex;
[0010] The photoelectric sensor is arranged on one side of the eighth mirror surface, and the light beam is incident on the first lens from the first mirror surface, and sequentially passes through the second mirror surface, the third mirror surface, the fourth mirror surface, the fifth mirror surface, the sixth mirror surface, the seventh mirror surface, and the eighth mirror surface until it is incident on the photoelectric sensor;
[0011] The field of view of the lens is 180-190 degrees, the relative aperture is 1.8-2.8, the diameter of the diffraction spot is less than 5um, and the relative aperture is greater than 50%.
[0012] In an embodiment, the aperture of the first mirror is 8-12mm, the aperture of the second mirror is 4.2-5.5mm, the aperture of the third mirror is 2-6mm, the aperture of the fourth mirror is 2.4-6mm, the aperture of the fifth mirror is 3-5mm, the aperture of the sixth mirror is 3.1-5mm, the aperture of the seventh mirror is 3-5mm, and the aperture of the eighth mirror is 2.5-5.5mm.
[0013] In an embodiment, the first lens is a negative lens, the second lens is a positive lens, the third lens is a positive lens, and the fourth lens is a negative lens.
[0014] In an embodiment, the radius of curvature of the first mirror is 43-44.5, the radius of curvature of the second mirror is 2-3, the radius of curvature of the third mirror is 7.2-8, the radius of curvature of the fourth mirror is 7.2-8, the radius of curvature of the fifth mirror is 6.5-7.5, the radius of curvature of the sixth mirror is 2.2-3.1, the radius of curvature of the seventh mirror is 2.2-3, and the radius of curvature of the eighth mirror is 36-41.
[0015] In an embodiment, the thickness of the first lens is 0.4-0.8mm, the distance between the second mirror and the third mirror is 5.5-6mm, the thickness of the second lens is 3.7-4.5mm, the distance between the fourth mirror and the fifth mirror is 0.02-0.15mm, the thickness of the third lens is 2-2.8mm, and the thickness of the fourth lens is 0.3-0.8mm.
[0016] The convex shape of the sixth mirror is matched with the concave shape of the seventh mirror, and the sixth mirror and the seventh mirror are arranged in abutment.
[0017] In an embodiment, the refractive index of the first lens is 1.68-1.71, the refractive index of the second lens is 1.75-1.79, the refractive index of the third lens is 1.68-1.71, and the refractive index of the fourth lens is 1.83-1.86.
[0018] The dispersion coefficient of the first lens is 54-56, the dispersion coefficient of the second lens is 48-52, the dispersion coefficient of the third lens is 54-56, and the dispersion coefficient of the fourth lens is 22-24.
[0019] In an embodiment, the Abbe number of the first lens, the second lens, the third lens and the fourth lens is greater than 60.
[0020] In an embodiment, the wide-angle optical system further comprises a protective sheet, the protective sheet is arranged on the side of the first lens away from the second lens, and the imaging wavelength band of the protective sheet is 450nm-940nm.
[0021] In an embodiment, the wide-angle optical system further comprises a housing, the housing has a receiving cavity therein, and the photoelectric sensor, the first lens, the second lens, the third lens and the fourth lens are arranged in the receiving cavity.
[0022] The optical axes of the first lens, the second lens, the third lens and the fourth lens are arranged in an overlapping manner.
[0023] In an embodiment, the wide-angle optical system further comprises a rotating member, the photoelectric sensor and the lens are arranged on the rotating member, and the rotating member is used to drive the lens and the photoelectric sensor to rotate synchronously.
[0024] In addition, to solve the above problems, the utility model further provides an optical equipment, the optical equipment is loaded with the wide-angle optical system as above.
[0025] The lens in the technical scheme of the utility model only adopts four lenses to greatly reduce the overall size of the lens; the field of view angle of the lens is 180 degrees-190 degrees, the relative aperture is 1.8-2.8, the diameter of the diffraction spot is less than 5um, and the relative light is greater than 50%; by reducing the number of lenses, spherical aberration, coma, astigmatism, chromatic aberration and the like can be effectively corrected, the debugging difficulty is reduced, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.
[0027] Figure 1 The structure schematic diagram of the embodiment provided by the utility model;
[0028] Figure 2 For Figure 1 The MTF curve diagram of the camera objective optical system;
[0029] Figure 3 For Figure 1 Point diagram of the camera objective optical system
[0030] Figure 4 For Figure 1 Ray aberration diagram of the camera objective optical system
[0031] Figure 5 For Figure 1 Left field curvature diagram and right distortion diagram of the camera objective optical system
[0032] Figure 6 For Figure 1 Relative illumination diagram of the camera objective optical system
[0033] BRIEF DESCRIPTION OF DRAWINGS
[0034]
[0035] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION
[0036] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0037] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.
[0038] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.
[0039] The utility model discloses a wide-angle optical system and optical equipment. Wide-angle optical system includes lens and photoelectric sensor 50, the lens includes first lens 10, second lens 20, third lens 30 and fourth lens 40 arranged in sequence, first lens 10 includes first mirror 11 and second mirror 12, first mirror 11 is convex, and second mirror 12 is concave, second lens 20 includes third mirror 21 and fourth mirror 22, third mirror 21 and fourth mirror 22 are all convex, third lens 30 includes fifth mirror 31 and sixth mirror 32, fifth mirror 31 and sixth mirror 32 are all convex, fourth lens 40 includes seventh mirror 41 and eighth mirror 42, seventh mirror 41 is concave, and eighth mirror 42 is convex.
[0040] Photoelectric sensor 50 is arranged on one side of eighth mirror 42, and light beam is shot into first lens 10 by first mirror 11 and sequentially passes through second mirror 12, third mirror 21, fourth mirror 22, fifth mirror 31, sixth mirror 32, seventh mirror 41, eighth mirror 42 until incident on photoelectric sensor 50.
[0041] Among them, the field angle of the lens is 180 degrees~190 degrees, the relative aperture is 1.8~2.8, the dispersion spot diameter is less than 5um, and the relative light is greater than 50%.
[0042] In an embodiment, four lenses are arranged to realize ultra-wide-angle shooting, and the structure is simple. First lens 10 is an objective lens, please refer to Figure 1 , the left side of first lens 10 is first mirror 11, and first mirror 11 faces the object side, and from left to right, second mirror 12, third mirror 21… eighth mirror 42.
[0043] The light beams on the object side pass through the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40 in turn to reach the optical sensor, thereby being imaged on the optical sensor.
[0044] The first mirror surface 11 is a convex surface protruding to the left, the second mirror surface 12 is a concave surface concaving to the left, the third mirror surface 21 is a convex surface protruding to the left, the fourth mirror surface 22 is a convex surface protruding to the right, the fifth mirror surface 31 is a convex surface protruding to the left, the sixth mirror surface 32 is a convex surface protruding to the right, the seventh mirror surface 41 is a concave surface concaving to the right, and the eighth mirror surface 42 is a convex surface protruding to the right.
[0045] The second lens 20 and the third lens 30 are both double-convex lenses to produce large-angle deflection of the light rays, thereby shortening the focusing position of the light rays.
[0046] The first lens 10 is a negative lens, the second lens 20 is a positive lens, the third lens 30 is a positive lens, and the fourth lens 40 is a negative lens, thereby correcting the spherical aberration, the coma, the astigmatism, the chromatic aberration and the like. Figures 2-6 The imaging parameters in the embodiment are simulated.
[0047] The lens in the technical scheme of the utility model only adopts four lenses to greatly reduce the overall size of the lens; the field angle of the lens is 180 degrees, the relative aperture is 1.8-2.8, the diameter of the diffraction spot is less than 5um, and the relative light is greater than 50%; by reducing the number of lenses, the spherical aberration, the coma, the astigmatism, the chromatic aberration and the like can be effectively corrected, the debugging difficulty is reduced, and the production cost is reduced.
[0048] In an embodiment, the aperture of the first mirror surface 11 is 8-12mm, the aperture of the second mirror surface 12 is 4.2-5.5mm, the aperture of the third mirror surface 21 is 2-6mm, the aperture of the fourth mirror surface 22 is 2.4-6mm, the aperture of the fifth mirror surface 31 is 3-5mm, the aperture of the sixth mirror surface 32 is 3.1-5mm, the aperture of the seventh mirror surface 41 is 3-5mm, and the aperture of the eighth mirror surface 42 is 2.5-5.5mm.
[0049] In the embodiment, the apertures of the first mirror surface 11 to the eighth mirror surface 42 are respectively set to 8.4mm, 4.8mm, 2.2mm, 2.8mm, 3.4mm, 3.4mm, 3.6mm and 3.8mm. The overall size of the lens is greatly reduced, mass production is suitable, and the cost is low. Furthermore, the spherical aberration, the coma, the astigmatism, the chromatic aberration and the like can be corrected by assembling the above parameters, and the optimal image quality can be presented within ±90 degrees.
[0050] In an embodiment, the first mirror 11 has a radius of curvature of 43-44.5, the second mirror 12 has a radius of curvature of 2-3, the third mirror 21 has a radius of curvature of 7.2-8, the fourth mirror 22 has a radius of curvature of 7.2-8, the fifth mirror 31 has a radius of curvature of 6.5-7.5, the sixth mirror 32 has a radius of curvature of 2.2-3.1, the seventh mirror 41 has a radius of curvature of 2.2-3, and the eighth mirror 42 has a radius of curvature of 36-41.
[0051] In the embodiment, the first mirror 11 has a radius of curvature of 43.9352, the second mirror 12 has a radius of curvature of 2.584, the third mirror 21 has a radius of curvature of 7.758, the fourth mirror 22 has a radius of curvature of 7.758, the fifth mirror 31 has a radius of curvature of 7.096, the sixth mirror 32 has a radius of curvature of 2.673, the seventh mirror 41 has a radius of curvature of 2.673, and the eighth mirror 42 has a radius of curvature of 39.303.
[0052] It should be noted that, since the first mirror 11 has a large radius of curvature and is convex, the surface of the first mirror 11 is relatively flat, so that the protection sheet or the like can be installed in front of the first mirror 11 without affecting the imaging.
[0053] In an embodiment, the wide-angle optical system further comprises a protection sheet, which is arranged on the side of the first lens 10 away from the second lens 20, and has an imaging wavelength band of 450-650 nm, or in special cases, the imaging wavelength band of the protection sheet can be extended to 940 nm.
[0054] In an embodiment, as shown in Figure 1 , the thickness of the first lens 10 is 0.4-0.8 mm, the distance between the second mirror 12 and the third mirror 21 is 5.5-6 mm, the thickness of the second lens 20 is 3.7-4.5 mm, the distance between the fourth mirror 22 and the fifth mirror 31 is 0.02-0.15 mm, the thickness of the third lens 30 is 2-2.8 mm, and the thickness of the fourth lens 40 is 0.3-0.8 mm; wherein the convex shape of the sixth mirror 32 is matched with the concave shape of the seventh mirror 41, and the sixth mirror 32 and the seventh mirror 41 are arranged in abutment.
[0055] Preferably, the thickness of the first lens 10 is 0.6 mm, the interval between the second mirror surface 12 and the third mirror surface 21 is 5.8 mm, the thickness of the second lens 20 is 4.1 mm, the interval between the fourth mirror surface 22 and the fifth mirror surface 31 is 0.1 mm, the thickness of the third lens 30 is 2.3 mm, the sixth mirror surface 32 is attached to the seventh mirror surface 41, and the thickness of the fourth lens 40 is 0.34 mm.
[0056] The thickness of the lens refers to the wall thickness of the lens at the position of the optical axis or the central axis.
[0057] In an embodiment, the refractive index of the first lens 10 is 1.68-1.71, the refractive index of the second lens 20 is 1.75-1.79, the refractive index of the third lens 30 is 1.68-1.71, and the refractive index of the fourth lens 40 is 1.83-1.86; the dispersion coefficient of the first lens 10 is 54-56, the dispersion coefficient of the second lens 20 is 48-52, the dispersion coefficient of the third lens 30 is 54-56, and the dispersion coefficient of the fourth lens 40 is 22-24.
[0058] By using the material properties, the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 are prepared as high-refractive lenses, and the dispersion coefficient of the lenses is controlled to realize high-Abbe number and high-refractive lenses. The Abbe number of the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 is greater than 60.
[0059] In an embodiment, the wide-angle optical system further comprises a housing having a receiving cavity therein, and the photoelectric sensor 50, the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 are arranged in the receiving cavity; the optical axes of the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 are arranged in an overlapping manner.
[0060] The first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 are fixed in the housing, and the limiting effect of the housing is used to keep the optical axes of the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 in a straight line, thereby preventing the light beam from deviating when passing through different lenses and causing unclear imaging.
[0061] In this embodiment, in order to further improve the convenience and wide adaptability, adjusting blocks can be arranged on the housing, and the positions of the adjusting blocks correspond to the positions of the lenses. One adjusting block is arranged corresponding to each of the first lens 10 to the fourth lens 40. By pressing the adjusting blocks, the positions of the lenses in the housing can be adjusted, and the positions of the optical axes of the lenses can be adjusted.
[0062] In an embodiment, the wide-angle optical system further comprises a rotating member, which is connected with the housing, and is used to drive the lens and the photosensor 50 to rotate synchronously.
[0063] The rotating member can be connected with the housing in the form of gear rotation, and in use, the housing can be fixed, and the housing is rotated through the rotating member to adjust the imaging position and ensure that the first lens 10 is aligned with the object side.
[0064] In addition, to solve the above problems, the utility model further provides an optical equipment, which is provided with the wide-angle optical system.
[0065] The mirror surface aperture of each lens from the object side to the image side is 8.4mm, 4.8mm, 2.2mm, 2.8mm, 3.4mm, 3.4mm, 3.6mm and 3.8mm respectively. The overall size of the optical equipment is greatly reduced, and the optical equipment is suitable for batch production and has low cost. In addition, the above parameters can be used to correct spherical aberration, coma, astigmatism and chromatic aberration, and the optical equipment can present good image quality within ±90 degrees. Therefore, the utility model has small structure and can be applied to cat eyes of security doors, household monitoring devices and the like.
[0066] The above description is only preferred embodiments of the utility model, and does not limit the patent range of the utility model. Any equivalent structural transformation, direct / indirect application in other related technical fields and the like within the concept of the utility model, the contents of the utility model specification and the drawings are included in the patent protection range of the utility model.
Claims
1. A wide-angle optical system, characterized in that: The wide-angle optical system includes a lens and a photoelectric sensor, wherein the lens includes: A first lens, the first lens comprising a first mirror surface and a second mirror surface, the first mirror surface is convex, and the second mirror surface is concave; A second lens, the second lens comprising a third mirror surface and a fourth mirror surface, wherein the third mirror surface and the fourth mirror surface are both convex surfaces; A third lens, the third lens comprising a fifth mirror surface and a sixth mirror surface, both of which are convex surfaces; a fourth lens, the fourth lens including a seventh mirror surface and an eighth mirror surface, the seventh mirror surface is concave, and the eighth mirror surface is convex; The photoelectric sensor is arranged on one side of the eighth mirror surface, and the light beam is incident on the first lens from the first mirror surface, and sequentially passes through the second mirror surface, the third mirror surface, the fourth mirror surface, the fifth mirror surface, the sixth mirror surface, the seventh mirror surface, and the eighth mirror surface until it is incident on the photoelectric sensor; Among them, the first lens is a negative lens, the second lens is a positive lens, the third lens is a positive lens, and the fourth lens is a negative lens; the field of view angle of the lens is 180 degrees to 190 degrees, the relative aperture is 1.8 to 2.8, the diffuse spot diameter is less than 5um, and the relative transmittance is greater than 50%.
2. The wide-angle optical system according to claim 1, wherein: The aperture of the first mirror is 8mm~12mm, the aperture of the second mirror is 4.2mm~5.5mm, the aperture of the third mirror is 2mm~6mm, the aperture of the fourth mirror is 2.4mm~6mm, the aperture of the fifth mirror is 3mm~5mm, the aperture of the sixth mirror is 3.1mm~5mm, the aperture of the seventh mirror is 3mm~5mm, and the aperture of the eighth mirror is 2.5mm~5.5mm.
3. The wide-angle optical system according to claim 1, wherein: The radius of curvature of the first mirror surface is 43~44.5, the radius of curvature of the second mirror surface is 2~3, the radius of curvature of the third mirror surface is 7.2~8, the radius of curvature of the fourth mirror surface is 7.2~8, the radius of curvature of the fifth mirror surface is 6.5~7.5, the radius of curvature of the sixth mirror surface is 2.2~3.1, the radius of curvature of the seventh mirror surface is 2.2~3, and the radius of curvature of the eighth mirror surface is 36~41.
4. The wide-angle optical system according to claim 3, wherein: The thickness of the first lens is 0.4 mm to 0.8 mm, the distance between the second mirror surface and the third mirror surface is 5.5 mm to 6 mm, the thickness of the second lens is 3.7 mm to 4.5 mm, the distance between the fourth mirror surface and the fifth mirror surface is 0.02 mm to 0.15 mm, the thickness of the third lens is 2 mm to 2.8 mm, and the thickness of the fourth lens is 0.3 mm to 0.8 mm; The convex shape of the sixth mirror surface is matched with the concave shape of the seventh mirror surface, and the sixth mirror surface and the seventh mirror surface are arranged in close contact.
5. The wide-angle optical system according to claim 1, wherein: The refractive index of the first lens is 1.68-1.71, the refractive index of the second lens is 1.75-1.79, the refractive index of the third lens is 1.68-1.71, and the refractive index of the fourth lens is 1.83-1.86; The Abbe coefficient of the first lens is 54-56, the Abbe coefficient of the second lens is 48-52, the Abbe coefficient of the third lens is 54-56, and the Abbe coefficient of the fourth lens is 22-24.
6. The wide-angle optical system according to claim 1, wherein: The Abbe numbers of the first lens, the second lens, the third lens, and the fourth lens are greater than 60.
7. The wide-angle optical system according to claim 1, wherein: The wide-angle optical system further includes a protective sheet, which is disposed on a side of the first lens away from the second lens, and an imaging wavelength band of the protective sheet is 450 nm to 940 nm.
8. The wide-angle optical system according to claim 1, wherein: The wide-angle optical system further includes a housing having a housing therein, wherein the photoelectric sensor, the first lens, the second lens, the third lens, and the fourth lens are all disposed in the housing. The optical axes of the first lens, the second lens, the third lens, and the fourth lens are arranged to overlap.
9. The wide-angle optical system according to claim 8, wherein: The wide-angle optical system further includes a rotating member connected to the housing, and the rotating member is used to drive the lens and the photoelectric sensor to rotate synchronously.
10. An optical device, characterized in that: The optical device is equipped with the wide-angle optical system according to any one of claims 1 to 9.