Miniature zero-distortion lens, lens module and read-write pen
Through the combination of four-piece lenses and plastic lens design, the problems of large lens size and high distortion rate are solved, miniaturization and high stability are achieved, and it is suitable for small reading and stylus and other equipment.
Patent Information
- Application Number
- CN202422286928.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The existing lenses have complex structures and large sizes, which are difficult to use in small-volume equipment, and have a high distortion rate, which affects the imaging quality.
The four-piece lens structure is adopted, including a combination of convex and concave lenses and concave lenses. It is combined with plastic lenses and gasket designs to reduce the number of lenses and optimize the curvature distribution, and combine the pressure cap and lens shell designs to improve stability and imaging quality.
It realizes the overall size of the lens, the simple structure, and the distortion rate is reduced to less than 1%, which improves the imaging clarity and service life, and is suitable for small reading and stylus and other equipment.
Smart Images
Figure CN223092205U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lenses, in particular to a small zero-distortion lens, a lens module and a writing pen. Background Technique
[0002] Lens distortion is actually a general term for the inherent perspective distortion of optical lenses, that is, the distortion caused by perspective. This kind of distortion is very unfavorable to the imaging quality of photos. After all, the purpose of photography is to reproduce, not to exaggerate. However, because this is an inherent characteristic of the lens (convex lenses converge light rays, concave lenses diverge light rays), it cannot be eliminated, only improved; a distorted lens refers to the phenomenon that the image appears stretched or compressed at the edge or center due to the structural or design defects of the lens itself. There are mainly two types of this distortion phenomenon, barrel distortion and pincushion distortion. Both of these distortions are caused by the physical performance of the lens and the structure of the lens group, resulting in a deviation in shape between the imaging picture and the actual scene.
[0003] In the prior art, the Chinese utility model content with the application number CN201620921683.9 discloses a high-definition zero-distortion aerial photography lens, which includes a lens housing and a first lens element, a second lens element, a third lens element, a diaphragm hole, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element arranged in sequence from the object side to the image side inside the lens housing. The first lens element is a meniscus lens with a positive optical power and convex towards the object side; the second lens element is a meniscus lens with a positive optical power and convex towards the object side. This high-definition zero-distortion aerial photography lens adopts 8 lenses, which can effectively correct the aberration in the optical system, achieve satisfactory optical characteristics and a relatively wide total field of view angle, with a super-wide angle diagonal of 100°, and at the same time has a low distortion degree and optical distortion.
[0004] The lens structure in the prior art is relatively complex, and the volume of the lens is relatively large, making it difficult to be used on small-volume equipment, thus increasing the limitations of the use of the lens. Therefore, we need to propose a small zero-distortion lens, a lens module and a writing pen. Utility Model Content
[0005] The purpose of the present utility model is to provide a small zero-distortion lens, a lens module and a writing pen, to reduce the overall volume of the lens, thereby reducing the structural complexity of the lens, improving the stability of the lens structure, and making the distortion of the lens less than 1%, so as to solve the problems raised in the above background technique.
[0006] To achieve the above purpose, the present utility model provides the following technical solution: A lens module includes a first lens piece, a second lens piece, a third lens piece, a fourth lens piece and an infrared filter arranged in sequence from the object side to the image side along the optical axis;
[0007] The object side surface of the first lens along the optical axis is convexly arranged, the image side surface of the first lens is concavely arranged, and the first lens is a convex-concave lens;
[0008] The object side surface of the second lens along the optical axis is convexly arranged, the image side surface of the second lens is concavely arranged, and the second lens is a convex-concave lens;
[0009] The object side surface of the third lens along the optical axis is convexly arranged, the image side surface of the third lens is convexly arranged, and the third lens is a convex-convex lens;
[0010] The object side surface of the fourth lens along the optical axis is convexly arranged, the image side surface of the fourth lens is concavely arranged, and the fourth lens is a concave-concave lens.
[0011] Preferably, the curvature of the convex surface on the object side of the first lens is greater than the curvature of the convex surface on the object side of the second lens, the curvature of the convex surface on the image side of the first lens is greater than the curvature of the convex surface on the image side of the second lens, and the curvature of the convex surface on the image side of the first lens is greater than the curvature of the convex surface on the object side of the second lens.
[0012] By adopting the above technical solution, the imaging is affected by different curvatures, the shooting range of the lens is expanded, and the field of view is expanded.
[0013] Preferably, the curvature of the convex surface on the image side of the second lens is greater than the curvature of the convex surface on the object side of the third lens, and the curvature of the concave surface on the image side of the third lens is greater than the curvature of the concave surface on the object side of the fourth lens.
[0014] By adopting the above technical solution, a smaller lens curvature can improve the imaging quality and ensure the clarity of the imaging.
[0015] Preferably, a first spacer is arranged between the first lens and the second lens, a second spacer is arranged between the second lens and the third lens, a third spacer is arranged between the third lens and the fourth lens, and a fourth spacer is arranged between the fourth lens and the infrared filter.
[0016] By adopting the above technical solution, the friction between the first lens, the second lens, the third lens and the fourth lens is reduced by using the first spacer, the second spacer, the third spacer and the fourth spacer, and scratching and damage are prevented.
[0017] Preferably, the first lens, the second lens, the third lens and the fourth lens are all plastic lenses, and the outer diameters of the first lens, the second lens, the third lens and the fourth lens increase in sequence from the object side to the image side along the optical axis.
[0018] By adopting the above technical solution, the number of lens pieces used is reduced, and the production cost is reduced.
[0019] A small zero-distortion lens, comprising a lens module described above, further comprising a retaining cap and a lens housing for mounting the lens module. An external threaded portion that is threadedly connected to the middle of the inner cavity of the lens housing is provided in the middle of the outer side of the retaining cap. The inner wall of the retaining cap is arranged in a stepped manner. The object side of the lens housing is arranged in a cylindrical shape, and the image side of the lens housing is arranged in a square tube shape.
[0020] By adopting the above technical solution, the stability of the overall lens installation is improved, the first lens, the second lens, the third lens and the fourth lens are protected from damage, and the service life is increased.
[0021] A reading and writing pen, comprising a small zero-distortion lens described above. The reading and writing pen comprises a pen barrel. One end of the pen barrel is provided with the above-mentioned small zero-distortion lens. A speaker is provided at the other end of the pen barrel. Buttons and a headphone jack are provided on the pen barrel. A power source, a memory card and a processor are provided inside the pen barrel. The speaker, the buttons, the memory card and the electronic photosensitive element of the small zero-distortion lens are all electrically connected to the processor.
[0022] By adopting the above technical solution, the operation is convenient. It is convenient to use by connecting a wired headphone through the headphone jack. At the same time, it is convenient to expand the sound by using the speaker, and the listening and reading are convenient. The use of a mobile power source can improve the portability of use.
[0023] Compared with the prior art, the beneficial effects of the present utility model are:
[0024] The present utility model mainly through the cooperation between the first lens, the second lens, the third lens and the fourth lens, and utilizes the different concave and convex surfaces on the object side and the image side of the first to fourth lenses to facilitate imaging of an object, and reduces the use of lenses, reduces the overall volume of the lens, and at the same time reduces the structural complexity of the lens. By using the fitting of the concave and convex surfaces between the lenses, the structural stability of the lens is improved, the distortion rate of the lens is reduced, and the service life of the lens is increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is an exploded structural schematic diagram of the present utility model;
[0026] Figure 2 is a cross-sectional structural schematic diagram of the retaining cap of the present utility model;
[0027] Figure 3 is a front view structural schematic diagram of the present utility model;
[0028] Figure 4 is a cross-sectional side view structural schematic diagram of the present utility model.
[0029] In the figure: 1. compression cap; 2. first lens element; 3. first spacer; 4. second lens element; 5. second spacer; 6. third lens element; 7. third spacer; 8. fourth lens element; 9. fourth spacer; 10. infrared filter; 11. lens housing. Detailed implementation mode
[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0031] Please refer to Figures 1-4 , the present invention provides a technical solution: a lens module, including a first lens element 2, a second lens element 4, a third lens element 6, a fourth lens element 8, and an infrared filter 10 arranged in sequence from the object side to the image side along the optical axis;
[0032] The object side surface of the first lens element 2 along the optical axis is convex, and the image side surface of the first lens element 2 is concave. The first lens element 2 is a convex-concave lens;
[0033] The object side surface of the second lens element 4 along the optical axis is convex, and the image side surface of the second lens element 4 is concave. The second lens element 4 is a convex-concave lens;
[0034] The object side surface of the third lens element 6 along the optical axis is convex, and the image side surface of the third lens element 6 is convex. The third lens element 6 is a convex-convex lens;
[0035] The object side surface of the fourth lens element 8 along the optical axis is convex, and the image side surface of the fourth lens element 8 is concave. The fourth lens element 8 is a concave-concave lens.
[0036] The curvature of the convex surface on the object side of the first lens element 2 is greater than the curvature of the convex surface on the object side of the second lens element 4. The curvature of the convex surface on the image side of the first lens element 2 is greater than the curvature of the convex surface on the image side of the second lens. The curvature of the convex surface on the image side of the first lens element 2 is greater than the curvature of the convex surface on the object side of the second lens element 4. Due to the different effects of different curvatures on imaging, the lens with a larger curvature can provide a wider field of view.
[0037] The curvature of the convex surface on the image side of the second lens element 4 is greater than the curvature of the convex surface on the object side of the third lens element 6. The curvature of the concave surface on the image side of the third lens element 6 is greater than the curvature of the concave surface on the object side of the fourth lens element 8. The lens with a smaller curvature may provide clearer imaging.
[0038] A first spacer 3 is provided between the first lens 2 and the second lens 4, a second spacer 5 is provided between the second lens 4 and the third lens 6, a third spacer 7 is provided between the third lens 6 and the fourth lens 8, and a fourth spacer 9 is provided between the fourth lens 8 and the infrared filter 10. The first lens 2, the second lens 4, the third lens 6 and the fourth lens 8 are separated by the first spacer 3, the second spacer 5, the third spacer 7 and the fourth spacer 9. The first spacer 3, the second spacer 5, the third spacer 7 and the fourth spacer 9 are mainly used to reduce the friction between the lenses, prevent the lenses from being scratched, reduce mildew and cracking, and reduce thermal stress, prevent the lenses from cracking, and improve the service life of the lenses.
[0039] The first lens 2, the second lens 4, the third lens 6 and the fourth lens 8 are all plastic lenses. The outer diameters of the first lens 2, the second lens 4, the third lens 6 and the fourth lens 8 increase sequentially from the object side to the image side along the optical axis, reducing the number of lenses used, thereby reducing the production cost of the lens. At the same time, by using the increasing diameter, the overall installation efficiency and stability of the lens are improved, and the aspherical lenses of the lenses provide better visual effects and comfort than spherical lenses through their unique design.
[0040] A small zero-distortion lens includes a lens module described above, and also includes a retaining cap 1 and a lens housing 11 for mounting the lens module. An external thread portion for threaded connection with the middle part of the inner cavity of the lens housing 11 is provided in the middle of the outer side of the retaining cap 1. The inner wall of the retaining cap 1 is arranged in a stepped shape. The object side of the lens housing 11 is arranged in a cylindrical shape, and the image side of the lens housing 11 is arranged in a square tube shape. The first lens 2, the second lens 4, the third lens 6 and the fourth lens 8 can be quickly installed through the retaining cap 1, and the lens housing 11 is used to protect the retaining cap 1, improving the overall service life of the lens, avoiding deformation of the lens module, and making the distortion of the lens module less than 1%.
[0041] A writing and reading pen includes a small zero-distortion lens described above. Specifically, the writing and reading pen includes a pen barrel. One end of the pen barrel is provided with the above-mentioned small zero-distortion lens, the other end of the pen barrel is provided with a speaker, the pen barrel is provided with a button and a headphone jack, and a power supply, a memory card and a processor are arranged inside the pen barrel. The speaker, the button, the memory card and the electronic photosensitive element of the small zero-distortion lens are all electrically connected to the processor, and the power supply is used for power supply.
[0042] In use, hold the reading and writing pen and align the lens module of the small zero-distortion lens with the part to be read, and slide it horizontally. After the lens module forms an image of the object, the image is emitted through the speaker to facilitate the user's operation and improve the user experience. The lens module utilizes the cooperation of the first lens 2, the second lens 4, the third lens 6 and the fourth lens 8 to reduce the overall volume, improve the stability of the lens module, help the light to be focused and imaged, reduce the distortion rate of the lens, increase the range of point reading, improve the point reading and shooting effects under different tilting angles, and improve the point reading quality.
[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A lens module, characterized in that: It includes a first lens (2), a second lens (4), a third lens (6), a fourth lens (8) and an infrared filter (10) arranged in sequence from the object side to the image side along the optical axis; The object side surface of the first lens (2) along the optical axis is convex, the image side surface of the first lens (2) is concave, and the first lens (2) is a convex-concave lens; The object side surface of the second lens (4) along the optical axis is convex, the image side surface of the second lens (4) is concave, and the second lens (4) is a convex-concave lens; The object side surface of the third lens (6) along the optical axis is convex, the image side surface of the third lens (6) is convex, and the third lens (6) is a convex-convex lens; The object side surface of the fourth lens (8) along the optical axis is convex, the image side surface of the fourth lens (8) is concave, and the fourth lens (8) is a concave-concave lens.
2. The lens module according to claim 1, wherein: The curvature of the convex surface on the object side of the first lens (2) is greater than the curvature of the convex surface on the object side of the second lens (4), the curvature of the convex surface on the image side of the first lens (2) is greater than the curvature of the convex surface on the image side of the second lens, and the curvature of the convex surface on the image side of the first lens (2) is greater than the curvature of the convex surface on the object side of the second lens (4).
3. The lens module according to claim 2, wherein: The curvature of the convex surface on the image side of the second lens (4) is greater than the curvature of the convex surface on the object side of the third lens (6), and the curvature of the concave surface on the image side of the third lens (6) is greater than the curvature of the concave surface on the object side of the fourth lens (8).
4. A lens module according to claim 3, characterized in that: A first spacer (3) is arranged between the first lens (2) and the second lens (4), a second spacer (5) is arranged between the second lens (4) and the third lens (6), a third spacer (7) is arranged between the third lens (6) and the fourth lens (8), and a fourth spacer (9) is arranged between the fourth lens (8) and the infrared filter (10).
5. The lens module according to claim 4, wherein: The first lens (2), the second lens (4), the third lens (6) and the fourth lens (8) are all plastic lenses, and the outer diameters of the first lens (2), the second lens (4), the third lens (6) and the fourth lens (8) increase in sequence from the object side to the image side along the optical axis.
6. A small zero-distortion lens, comprising a lens module according to any one of claims 1-5, characterized in that: It further includes a retaining cap (1) and a lens housing (11) for mounting the lens module. An external thread portion for threaded connection with the middle part of the inner cavity of the lens housing (11) is arranged in the middle of the outer side of the retaining cap (1). The inner wall of the retaining cap (1) is arranged in a stepped shape. The object side of the lens housing (11) is arranged in a cylindrical shape, and the image side of the lens housing (11) is arranged in a square tube shape.
7. A reading and writing pen, characterized in that, It includes a small zero-distortion lens as described in claim 6. The writing pen includes a pen barrel. One end of the pen barrel is provided with the above-mentioned small zero-distortion lens, the other end of the pen barrel is provided with a speaker, the pen barrel is provided with a key and a headphone jack, and a power supply, a memory card and a processor are arranged inside the pen barrel. The speaker, the key, the memory card and the electronic photosensitive element of the small zero-distortion lens are all electrically connected to the processor.
Citation Information
Patent Citations
High zero clearing distortion camera lens of taking photo by plane
CN205992081U