Optical lens capable of reducing stray light

Abstract

The utility model discloses an optical lens capable of reducing stray light, which comprises a lens barrel, a lens cover fixedly connected to one side of the lens barrel, and an abutting device arranged in the lens cover. The utility model relates to the technical field of optical lenses, and according to the optical lens capable of reducing stray light, through cooperation of a limiting groove, a limiting ring, an object carrying groove, a spring, an abutting plate and a sealing gasket, the lens and the lens cover are fixed together, and the problem that in actual use, the lens and the lens cover are usually fixed through optical cement, and the lens cover is not fixed is solved. The performance of the optical cement is influenced by temperature, when the temperature change is large, the connection strength between the lens and the lens cover is possibly reduced, so that foreign matters enter the lens more easily, the transmission path of light rays is changed, the generation of stray light is increased, the lens is damaged, and the service life of the lens is prolonged. And the later maintenance cost is increased.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, specifically to an optical lens that reduces stray light. Background Technology

[0002] Optical lenses are a key component of mobile phone imaging systems. They are mainly used to collect and focus light to clearly image the external scene onto the image sensor, thereby enabling functions such as taking photos and recording videos.

[0003] In traditional optical lenses, users install a lens hood using the lens cap to reduce stray light.

[0004] However, in actual use, the lens and lens cap are usually fixed together with optical adhesive. The performance of optical adhesive is affected by temperature. When the temperature changes significantly, the connection strength between the lens and lens cap may decrease, making it easier for foreign objects to enter the lens. Foreign objects entering the lens will not only change the propagation path of light and increase the generation of stray light, but also damage the lens and increase the cost of later maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an optical lens that reduces stray light. It solves the problem that in actual use, the lens and lens cap are usually fixed with optical adhesive. The performance of optical adhesive is affected by temperature. When the temperature changes significantly, the connection strength between the lens and lens cap may decrease, making it easier for foreign objects to enter the lens. Foreign objects entering the lens not only change the light propagation path and increase the generation of stray light, but also damage the lens and increase the cost of later maintenance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an optical lens for reducing stray light, comprising a lens barrel, a lens cover fixedly connected to one side of the lens barrel, and a clamping device disposed inside the lens cover; a fixing device disposed on the side of the lens barrel away from the lens cover; and an anti-reflective device disposed inside the lens barrel; wherein, the clamping device prevents the lens cover from detaching from the lens barrel, the fixing device enables quick installation and removal of the lens near the imaging sensor, and the anti-reflective device further reduces stray light.

[0007] Preferably, the clamping device includes a limiting groove, which is formed on the side of the lens cover near the lens barrel; a limiting ring is engaged with the inner wall of the limiting groove and fixedly connected to the outer wall of the lens barrel; a loading groove is formed on the side of the lens cover away from the lens barrel; a spring is fixedly connected to the inner wall of the loading groove; a clamping plate is fixedly connected to the end of the spring away from the loading groove and fits against the inner wall of the lens cover; a sealing gasket is fixedly connected to the outer wall of the clamping plate away from the spring, fits against the inner wall of the lens cover, and clamps against the outer wall of the lens barrel away from the fixing device; wherein, through the cooperation of the limiting groove, limiting ring, loading groove, spring, clamping plate and sealing gasket, the lens cover is prevented from detaching from the lens barrel.

[0008] Preferably, the inner wall of the lens barrel is fitted with a first lens, a second lens, and a third lens in sequence from left to right. A light-shielding ring is provided on the side of the outer wall of the first lens away from the second lens. The light-shielding ring is fixedly connected to the inner wall of the lens barrel and extends to the outside of the lens barrel. The outer wall of the light-shielding ring is sequentially inserted into the inner wall of the sealing gasket, the clamping plate, and the spring. A plane mirror is provided on the side of the outer wall of the light-shielding ring away from the first lens. The plane mirror is fixedly connected to the inner wall of the lens cover.

[0009] Preferably, the fixing device includes a fixing ring disposed on the side of the outer wall of the third lens away from the second lens; four auxiliary grooves are provided, all located on the side of the outer wall of the fixing ring away from the third lens; a rubber pad is fixedly connected to the side of the outer wall of the fixing ring near the third lens and abuts against the outer wall of the third lens; a fixing clip is fixedly connected to the outer wall of the fixing ring and engages with the inner wall groove of the lens barrel; wherein, through the cooperation of the fixing ring, auxiliary grooves, rubber pad and fixing clip, the third lens can be quickly installed and removed.

[0010] Preferably, the anti-reflective device includes three first anti-reflective grooves, all of which are located on the inner wall of the lens barrel; three second anti-reflective grooves, all located on the inner wall of the lens barrel near the first anti-reflective grooves; and anti-reflective films are fixedly connected to the outer walls of the first lens, the second lens, and the third lens, respectively; wherein, through the cooperation of the first anti-reflective grooves, the second anti-reflective grooves, and the anti-reflective films, the purpose of further reducing stray light is achieved.

[0011] Beneficial effects

[0012] This invention provides an optical lens that reduces stray light. It offers the following advantages: This stray light-reducing optical lens, through the cooperation of a limiting groove, a limiting ring, a carrying groove, a spring, a clamping plate, and a sealing gasket, secures the lens and lens cap together. This solves the problem that in practical use, the lens and lens cap are usually fixed together with optical adhesive. The performance of optical adhesive is affected by temperature; large temperature changes may reduce the connection strength between the lens and lens cap, making it easier for foreign objects to enter the lens. Foreign objects entering the lens not only alter the light propagation path and increase stray light generation, but also damage the lens elements, increasing subsequent maintenance costs.

[0013] By using a retaining ring, auxiliary groove, rubber pad, and retaining clip, the lens close to the imaging sensor can be quickly installed and removed. This solves the problem that when using optical lenses that reduce stray light in actual use, the lens may age over time. Since the innermost lens is closer to the imaging sensor, it may have a more direct impact on image quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the appearance of the present utility model;

[0016] Figure 3 for Figure 1 Schematic diagram of the middle limiting groove, limiting ring and loading groove;

[0017] Figure 4 for Figure 1 A schematic diagram of the structure of the fixing ring, auxiliary groove and rubber pad.

[0018] In the diagram: 1. Lens tube; 11. First lens; 12. Second lens; 13. Third lens; 14. Light-shielding ring; 2. Lens cover; 21. Plane mirror; 3. Clamping device; 31. Limiting groove; 32. Limiting ring; 33. Loading groove; 34. Spring; 35. Clamping plate; 36. Sealing gasket; 4. Fixing device; 41. Fixing ring; 42. Auxiliary groove; 43. Rubber pad; 44. Fixing clip; 5. Anti-reflective coating device; 51. First anti-reflective groove; 52. Second anti-reflective groove; 53. Anti-reflective coating. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In actual use, the lens and lens cap are usually fixed together with optical adhesive. The performance of optical adhesive is affected by temperature. When the temperature changes significantly, the connection strength between the lens and lens cap may decrease, making it easier for foreign objects to enter the lens. Foreign objects entering the lens will not only change the propagation path of light and increase the generation of stray light, but also damage the lens and increase the cost of later maintenance.

[0021] In view of this, the present invention provides an optical lens that reduces stray light, solving the problem that in actual use, the lens and lens cap are usually fixed with optical adhesive. The performance of optical adhesive is affected by temperature. When the temperature changes significantly, the connection strength between the lens and lens cap may decrease, making it easier for foreign objects to enter the lens. Foreign objects entering the lens will not only change the propagation path of light and increase the generation of stray light, but also damage the lens and increase the cost of later maintenance.

[0022] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0023] Example 1: By Figure 1-4 As can be seen, an optical lens for reducing stray light includes a lens barrel 1, with a lens cap 2 fixedly connected to one side of the lens barrel 1. The optical lens for reducing stray light also includes a clamping device 3, a fixing device 4, and an anti-reflective device 5. The clamping device 3 is disposed inside the lens cap 2; the fixing device 4 is disposed on the side of the lens barrel 1 away from the lens cap 2; and the anti-reflective device 5 is disposed inside the lens barrel 1. The clamping device 3 prevents the lens cap 2 from detaching from the lens barrel 1, the fixing device 4 allows for quick installation and removal of the lens near the imaging sensor, and the anti-reflective device 5 achieves the purpose of further reducing stray light.

[0024] In the specific implementation process, it is worth noting that the lens barrel 1 is cylindrical in shape with a cross-section similar to a 'T'. Its inner wall is coated with a special optical light-absorbing coating. The outer wall near the fixing device 4 has a mounting groove to facilitate subsequent installation with other parts. The lens cover 2 is roughly ring-shaped and can be made of plastic. It is fixed to the outer wall of the lens barrel 1 with optical adhesive. The outer wall of the lens cover 2 is fixed with a buffer ring made of rubber. The buffer ring plays a role in absorbing and cushioning when the lens is hit. First, the operator uses the clamping device 3 to prevent the lens cover 2 from detaching from the lens barrel 1 when the optical adhesive changes, which would cause foreign objects to enter the interior of the lens barrel 1. Second, the fixing device 4 is used to quickly install and remove the lens near the imaging sensor. Finally, the anti-reflective device 5 is used to further reduce stray light.

[0025] Furthermore, the clamping device 3 includes a limiting groove 31, a limiting ring 32, a loading groove 33, a spring 34, a clamping plate 35, and a sealing gasket 36. The limiting groove 31 is located on the side of the lens cover 2 closest to the lens barrel 1; the limiting ring 32 is engaged with the inner wall of the limiting groove 31 and fixedly connected to the outer wall of the lens barrel 1; the loading groove 33 is located on the side of the lens cover 2 away from the lens barrel 1; the spring 34 is fixedly connected to the inner wall of the loading groove 33; the clamping plate 35 is fixedly connected to the end of the spring 34 away from the loading groove 33 and fits against the inner wall of the lens cover 2; the sealing gasket 36 is fixedly connected to the outer wall of the clamping plate 35 away from the spring 34 and fits against the inner wall of the lens cover 2, and clamps against the outer wall of the lens barrel 1 away from the fixing device 4. The cooperation of the limiting groove 31, the limiting ring 32, the loading groove 33, the spring 34, the clamping plate 35, and the sealing gasket 36 prevents the lens cover 2 from detaching from the lens barrel 1.

[0026] In the specific implementation process, it is worth noting that the limiting groove 31 is generally annular with a cross-section similar to a right trapezoid, and the limiting ring 32 is also annular with a cross-section similar to a right trapezoid. It is fixed to the outer wall of the lens barrel 1. The two work together to secure the lens barrel 1 to the lens cover 2. The carrying groove 33 has a rectangular cross-section and is used to hold the spring 34. The spring 34 is made of spring steel, and its elastic coefficient is selected according to actual needs to meet operational requirements. The clamping plate 35 is generally annular and can be made of plastic. The sealing gasket 36 has a similar overall shape to the clamping plate 35, but its inner diameter is smaller than that of the clamping plate 35. The inner diameter of the clamping plate 35 and the material of the sealing gasket 36 can be rubber. Through the cooperation of the limiting groove 31, limiting ring 32, loading groove 33, spring 34, clamping plate 35 and sealing gasket 36, even if the optical adhesive softens in a high temperature environment, resulting in a decrease in adhesion, or becomes brittle in a low temperature environment, resulting in cracks, it will not affect the connection between the lens cap 2 and the lens barrel 1. This ensures that no foreign objects will enter the interior of the lens barrel 1 through the gaps and damage the lens, prevent the increase of stray light, improve the service life of the optical lens that reduces stray light, and reduce the hidden dangers of stray light generation.

[0027] Furthermore, from left to right, the inner wall of the lens barrel 1 is sequentially fitted with a first lens 11, a second lens 12, and a third lens 13. A light-shielding ring 14 is provided on the outer wall of the first lens 11 away from the second lens 12. The light-shielding ring 14 is fixedly connected to the inner wall of the lens barrel 1 and extends to the outside of the lens barrel 1. The outer wall of the light-shielding ring 14 is sequentially inserted into the inner wall of the sealing gasket 36, the clamping plate 35, and the spring 34. A plane mirror 21 is provided on the outer wall of the light-shielding ring 14 away from the first lens 11. The plane mirror 21 is fixedly connected to the inner wall of the lens cover 2.

[0028] In the specific implementation process, it is worth noting that the inner wall of the lens barrel 1 is provided with a mounting groove for mounting lenses. The first lens 11 is convex on both sides, the second lens 12 is concave on both sides, the third lens 13 is convex on the object side and flat on the image side. The light-shielding ring 14 is circular in shape and is made of engineering plastic. Its inner wall is coated with a special optical light-absorbing coating to improve the light-absorbing effect. The plane mirror 21 is installed on the inner wall of the lens cover 2. Its material can be fused silica. Fused silica has high hardness, good surface wear resistance, and is not easy to produce scratches and damage, thus ensuring the structural stability of the optical lens that reduces stray light.

[0029] Specifically, when installing the lens cap 2, the operator first moves the lens barrel 1 close to the lens cap 2, allowing the lens barrel 1 to enter the interior of the lens cap 2. The limiting ring 32 moves with the lens barrel 1 until it enters the limiting groove 31. Simultaneously, after the lens barrel 1 enters the interior of the lens cap 2, it presses against the sealing gasket 36. The sealing gasket 36 compresses the spring 34 through the pressing plate 35. Then, the operator stops moving the lens barrel 1, the traction force of the lens barrel 1 disappears, the pressure on the spring 34 decreases, and the spring 34 rebounds, causing the pressing plate 35 to move to one side of the lens barrel 1. The pressing plate 35 moves the sealing gasket 36, and the sealing gasket 36 pushes the lens barrel 1 to the side away from the lens cap 2. The lens barrel 1 causes the limiting ring 32 on its outer wall to move within the limiting groove 31. The outer wall of the limiting ring 32 presses against the inner wall of the limiting groove 31, achieving fixation. Even if the properties of the optical adhesive change, it will not affect the connection between the lens cap 2 and the lens barrel 1.

[0030] Example 2: From Figure 1-4 It is known that the fixing device 4 includes a fixing ring 41, an auxiliary groove 42, a rubber pad 43, and a fixing clip 44. The fixing ring 41 is located on the side of the outer wall of the third lens 13 away from the second lens 12. Four auxiliary grooves 42 are provided, all located on the side of the outer wall of the fixing ring 41 away from the third lens 13. The rubber pad 43 is fixedly connected to the side of the outer wall of the fixing ring 41 close to the third lens 13 and abuts against the outer wall of the third lens 13. The fixing clip 44 is fixedly connected to the outer wall of the fixing ring 41 and engages with the groove on the inner wall of the lens barrel 1. The fixing ring 41, the auxiliary groove 42, the rubber pad 43, and the fixing clip 44 work together to quickly install and remove the third lens 13.

[0031] In the specific implementation process, it is worth noting that the fixing ring 41 is generally circular and made of plastic. There are four auxiliary grooves 42 on the outer wall of the fixing ring 41, and their cross-section is 'L' shaped. When replacing the third lens 13, it is convenient for the staff to remove the fixing ring 41 with tools. The rubber pad 43 is generally circular and has a semi-circular cross-section. It is made of rubber and is used to press against the third lens 13 to prevent the fixing ring 41 from scratching the third lens 13. The fixing clip 44 is generally circular and is inserted into the groove on the inner wall of the lens barrel 1 to fix the fixing ring 41. Through the cooperation of the fixing ring 41, auxiliary grooves 42, rubber pads 43 and fixing clips 44, the staff can quickly install and remove the third lens 13 when needed, thereby improving the maintenance convenience of the optical lens that reduces stray light.

[0032] Furthermore, the anti-reflective coating device 5 includes a first anti-reflective groove 51, a second anti-reflective groove 52, and an anti-reflective film 53. Three first anti-reflective grooves 51 are provided, all located on the inner wall of the lens barrel 1; three second anti-reflective grooves 52 are provided, all located on the inner wall of the lens barrel 1 near the first anti-reflective grooves 51; the anti-reflective film 53 is fixedly connected to the outer walls of the first lens 11, the second lens 12, and the third lens 13, respectively. Through the cooperation of the first anti-reflective grooves 51, the second anti-reflective grooves 52, and the anti-reflective film 53, the purpose of further reducing stray light is achieved.

[0033] In the specific implementation process, it is worth noting that the cross-section of the first light-absorbing groove 51 is similar to an ellipse, and its reflective surface can be curved. The first light-absorbing groove 51 can cause light entering from the object side to be reflected multiple times in the groove, effectively reducing the intensity of reflected light, thereby reducing stray light entering the lens barrel and improving the image quality of the lens. The cross-section of the second light-absorbing groove 52 is similar to an angular structure. Light entering the light-absorbing groove from the object side is reflected multiple times between the first reflective surface and the second reflective surface, reducing the intensity of the reflected light and thus reducing the impact on the image. The inner walls of the first light-absorbing groove 51 and the second light-absorbing groove 52 are both provided with the same black matte light-absorbing coating as the inner wall of the lens barrel 1. Through the cooperation of the first light-absorbing groove 51, the second light-absorbing groove 52 and the anti-reflection coating 53, the staff can further reduce stray light and improve the anti-stray light efficiency of the optical lens that reduces stray light.

[0034] Specifically, when the third lens 13 needs to be replaced, the operator first inserts two tools into the auxiliary groove 42 simultaneously. Using the lever principle, the operator pries the fixing ring 41, causing it to deform slightly. The fixing ring 41 then moves the rubber pad 43 away from the third lens 13 and moves the fixing clip 44 away from the inner wall groove of the lens barrel 1. At this point, the entire fixing ring 41 is removed. Then, the old third lens 13 is replaced with a new one. Finally, the fixing ring 41 is put back in place.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optical lens for reducing stray light, comprising a lens barrel (1), characterized in that: A lens cap (2) is fixedly connected to one side of the lens barrel (1), and the optical lens for reducing stray light further includes: The clamping device (3) is located inside the mirror cover (2); The fixing device (4) is located on the side of the lens barrel (1) away from the lens cover (2); An anti-reflective device (5) is installed inside the lens barrel (1); The clamping device (3) prevents the lens cap (2) from detaching from the lens barrel (1), the fixing device (4) allows for quick installation and removal of the lens near the imaging sensor, and the anti-reflective device (5) further reduces stray light.

2. The optical lens of claim 1, wherein: The clamping device (3) includes: A limiting groove (31) is provided on the side of the lens cover (2) near the lens barrel (1); The limiting ring (32) is snapped into the inner wall of the limiting groove (31) and fixedly connected to the outer wall of the lens barrel (1); The object tray (33) is located on the side of the lens cover (2) away from the lens tube (1); Spring (34) is fixedly connected to the inner wall of the loading groove (33); The clamping plate (35) is fixedly connected to the end of the spring (34) away from the loading groove (33) and fits against the inner wall of the mirror cover (2); The sealing gasket (36) is fixedly connected to the outer wall of the abutment plate (35) on the side away from the spring (34), and is attached to the inner wall of the lens cover (2), and is pressed against the outer wall of the lens barrel (1) on the side away from the fixing device (4); The mirror cover (2) is prevented from detaching from the mirror tube (1) by the cooperation of the limiting groove (31), limiting ring (32), loading groove (33), spring (34), abutting plate (35) and sealing gasket (36).

3. The optical lens of claim 2, wherein: The inner wall of the lens barrel (1) is fitted with a first lens (11), a second lens (12) and a third lens (13) from left to right. A light-shielding ring (14) is provided on the outer wall of the first lens (11) away from the second lens (12). The light-shielding ring (14) is fixedly connected to the inner wall of the lens barrel (1) and extends to the outside of the lens barrel (1). The outer wall of the light-shielding ring (14) is sequentially inserted into the inner wall of the sealing gasket (36), the abutment plate (35) and the spring (34). A plane mirror (21) is provided on the outer wall of the light-shielding ring (14) away from the first lens (11). The plane mirror (21) is fixedly connected to the inner wall of the lens cover (2).

4. The optical lens of claim 3, wherein: The fixing device (4) includes: A fixing ring (41) is disposed on the outer wall of the third lens (13) on the side away from the second lens (12); There are four auxiliary slots (42), all of which are located on the side of the outer wall of the fixing ring (41) away from the third lens (13); The rubber pad (43) is fixedly connected to the outer wall of the fixing ring (41) on the side close to the third lens (13) and abuts against the outer wall of the third lens (13); The fixing clip (44) is fixedly connected to the outer wall of the fixing ring (41) and snapped into the inner wall groove of the lens tube (1); The third lens (13) can be quickly installed and removed by the cooperation of the fixing ring (41), auxiliary groove (42), rubber pad (43) and fixing clip (44).

5. The optical lens of claim 3, wherein: The extinction and anti-reflection device (5) includes: The first matting groove (51) is provided in three parts, all of which are opened on the inner wall of the lens tube (1); There are three second extinction grooves (52), all of which are located on the inner wall of the lens barrel (1) near the first extinction groove (51); Antireflective coatings (53) are fixedly connected to the outer walls of the first lens (11), the second lens (12), and the third lens (13), respectively; The purpose of further reducing stray light is achieved through the cooperation of the first extinction groove (51), the second extinction groove (52) and the antireflection film (53).

Images