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EP-3933459-B1 - OPTICAL ELEMENT, CAMERA MODULE, TERMINAL AND METHOD FOR PROCESSING OPTICAL ELEMENT

EP3933459B1EP 3933459 B1EP3933459 B1EP 3933459B1EP-3933459-B1

Inventors

  • YE, Haishui
  • YUAN, JUN
  • YU, FENG

Dates

Publication Date
20260506
Application Date
20200327

Claims (14)

  1. An optical component (10), comprising an optical component body (11) and an anti-reflection coating (12), wherein the anti-reflection coating is disposed on at least one surface of the optical component body through which light passes, the anti-reflection coating is configured to reduce reflectance of the at least one surface, and the anti-reflection coating and the optical component body are integrally formed by molding a same base material, wherein the at least one surface is further provided with a bump (13), the bump is located on an edge of the anti-reflection coating, and a height h 2 of the bump is greater than a thickness h of the anti-reflection coating, wherein the bump and the optical component body are integrally formed, wherein the optical component body is an optical protection window (11) for a camera module (100), and at least an outer surface of the optical protection window is provided with the anti-reflection coating, and wherein a chamfer is disposed at a corner between a side surface of the bump facing the anti-reflection coating and an end face of the bump away from the optical component body.
  2. The optical component according to claim 1, wherein the anti-reflection coating (12) comprises several protrusions (121) disposed in an array on a surface of the optical component body, and a distance W between central axes of any two adjacent protrusions is less than or equal to a minimum value in a visible light wavelength range.
  3. The optical component according to claim 2, wherein cross-sectional areas of the protrusion gradually decrease from an end close to the optical component body to an end far away from the optical component body.
  4. The optical component according to claim 3, wherein the protrusion is a conical protrusion, and a distance d between ends of any two adjacent protrusions close to the optical component body is 0 to 0.3 times a diameter d 1 of an end of the protrusion close to the optical component body; a diameter d 2 of an end of the protrusion away from the optical component body is 0 to 0.5 times the diameter d 1 of the end of the protrusion close to the optical component body; and a material of the protrusion is the same as a material of the optical component body.
  5. The optical component according to any one of claims 1 to 4, wherein the bump (13) is an annular bump, and the annular bump is disposed around the edge of the anti-reflection coating.
  6. The optical component according to any one of claims 1 to 5, wherein a difference between the height h 2 of the bump (13) and the thickness h of the anti-reflection coating (12) is 0 µm to 10 µm.
  7. The optical component according to any one of claims 2 to 4, wherein the distance W between the central axes of the any two adjacent protrusions (121) is 1/5 to 1/3 times the minimum value in the visible light wavelength range.
  8. The optical component according to claim 3 or 4, wherein the protrusion (121) is a conical protrusion, the diameter d 1 of the end of the protrusion close to the optical component body (11) is 40 nm to 250 nm, a height h 1 of the protrusion is 150 nm to 350 nm, a height-width ratio of the protrusion is α > 3, and α = h 1 / d 1 .
  9. A camera module (100), comprising at least one optical component (10) and an image sensor (20), wherein the optical component is the optical component according to any one of claims 1 to 8; the at least one optical component and the image sensor are sequentially arranged in an optical axis direction of the camera module; and the at least one optical component is located on a light incident side of the image sensor.
  10. A terminal (200), comprising a terminal body, a camera module (100), and a circuit board (300), wherein the camera module is disposed on the terminal body, the circuit board is disposed in the terminal body, and an image sensor of the camera module is electrically connected to the circuit board, the camera module comprises at least one optical component (10) and an image sensor (20), wherein the optical component is the optical component according to any one of claims 1 to 8; the at least one optical component and the image sensor are sequentially arranged in an optical axis direction of the camera module; and the at least one optical component is located on a light incident side of the image sensor.
  11. An optical component processing method, wherein the optical component (10) comprises an optical component body (11) and an anti-reflection coating (12), the anti-reflection coating is disposed on at least one surface of the optical component body through which light passes, the anti-reflection coating is configured to reduce reflectance of the at least one surface, and the processing method comprises: integrally forming the optical component body (11) and the anti-reflection coating (12) by molding a same base material, wherein the at least one surface is further provided with a bump (13), the bump is located on an edge of the anti-reflection coating, and a height h 2 of the bump is greater than a thickness h of the anti-reflection coating, wherein the bump and the optical component body are integrally formed, wherein the optical component body is an optical protection window for a camera module, and at least an outer surface of the optical protection window is provided with the anti-reflection coating, and wherein a chamfer is disposed at a corner between a side surface of the bump facing the anti-reflection coating and an end face of the bump away from the optical component body.
  12. The processing method according to claim 11, wherein the integrally forming the optical component body and the anti-reflection coating comprises: integrally forming the optical component body and the anti-reflection coating through one-step forming.
  13. The processing method according to claim 12, wherein the integrally forming the optical component body and the anti-reflection coating through one-step forming comprises: integrally forming the optical component body and the anti-reflection coating through molding.
  14. The processing method according to claim 11, wherein the anti-reflection coating comprises several protrusions disposed in an array on the at least one surface; a distance W between central axes of any two adjacent protrusions is less than or equal to a minimum value in a visible light wavelength range; and the integrally forming the optical component body and the anti-reflection coating comprises: integrally forming the optical component body and an anti-reflection coating substrate, and placing the anti-reflection coating substrate on at least one surface of the optical component body through which light passes; and etching the anti-reflection coating substrate by using an etching process, so as to form the anti-reflection coating.

Description

TECHNICAL FIELD This application relates to the field of terminal technologies, and in particular, to an optical component, a camera module, a terminal, and an optical component processing method. BACKGROUND Currently, photographing quality of a terminal has been significantly improved with improved structures of an image sensor and a lens. However, when the terminal takes photos in some environments (such as sunny days or street lamps at night), obvious ghosting or glare still exists. In this case, the photographing quality is relatively low. A mechanism for generating ghosting and glare is that stray light generated through one or more times of reflection of scene light on a surface of an optical component or a mechanical part of a camera module reaches the image sensor, and causes interference to light of the scene light that is directly transmitted by the optical component to the image sensor. Therefore, reducing reflectance of the scene light on the surface of the optical component can achieve the purpose of reducing stray light, and weakening ghosting and glare. To reduce the reflectance of the scene light on the surface of the optical component, an anti-reflection coating may be attached to the surface of the optical component. The anti-reflection coating is used to reduce the reflectance of the surface of the optical component. However, the anti-reflection coating is usually attached to the surface of the optical component in an adhesive manner, and adhesion strength is relatively low when adhesive is applied. Consequently, adhesive strength between the anti-reflection coating and the optical component is relatively weak, and under the action of scraping by external force, the anti-reflection coating is easily scraped off as a whole from the optical component. EP 3264144 A1 describes a camera module and a terminal. The camera module includes a cover window, an infrared cut-off filter, and an anti-reflection coating. The anti-reflection coating is on at least one surface, through which light passes, of the optical protection window, or the anti-reflection coating is on at least one surface, through which light passes, of the infrared cut-off filter. The anti-reflection coating includes conical anti-reflection structures. A bottom diameter of the conical anti-reflection structure is 40 nm to 150 nm. A top diameter of the conical anti-reflection structure is 0% to 30% of the bottom diameter. A height of the conical anti-reflection structure is 150 nm to 300 nm. A spacing between two adjacent conical anti-reflection structures is 1/5 to 1/3 of a wavelength in a visible light band. According to the camera module that has the anti-reflection coating, light reflection can be reduced, and a problem of ghosts and flare in photographing can be effectively inhibited. US 2018/128943 A1 describes an imaging device mounted on a vehicle. The imaging device includes an imaging element, a plurality of transparent members and a housing. The imaging element is configured to capture an object and output an image signal of the object. The plurality of transparent members includes at least one lens, and is arranged on a light transmission path of light that reaches the imaging element. The housing is configured to hold the imaging element and the plurality of transparent members. Moreover, the imaging device is provided with a moth-eye structure arranged on at least one surface among the plurality of transparent members. CN 107092044 A describes an antireflection thin film, a preparation method therefor, and a preparation method for a die of the antireflection thin film. The antireflection thin film comprises a sub-wavelength structural layer, and the sub-wavelength structural layer is provided with a projection structure. The antireflection thin film comprises the sub-wavelength structural layer and the projection structure, and the projection structure can protect the sub-wavelength structural layer, thereby preventing oil stain and fine dust from absorbing a concave-convex structure of the sub-wavelength structural layer, and avoiding the damages caused by the contact and friction between the concave-convex structure of the sub-wavelength structural layer and a hard object to the concave-convex structure. Therefore, the service life of the antireflection thin film is greatly prolonged. CN 101377554 A describes an antireflective structure that includes: a flat layer having a surface; a fine structure layer including: fine protrusions each including: a head end part, and a base face which is at least one of: a circular base face of a truncated cone, the circular base face having diameter of circle, and a polygonal base face of a truncated pyramid, the polygonal base face having diameter of circumscribing circle of polygonal base face, the fine protrusions being arranged on the surface of the flat layer to define a pitch, wherein, with first reflective face formed in head end part of each of the fine protrusions, and sec