ANNULAR OPTICAL COMPONENT AND CAMERA LENS MODULE

• US 20190324172A1
• Filed: 06/29/2018
• Published: 10/24/2019
• Est. Priority Date: 04/20/2018
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: CHOU, Ming-Ta, LUO, Ruei-Yang
• Granted Patent: US 11,016,221 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/0988 Diaphragms, spatial filters, masks for removing or filtering a part of the beam
• CPC Class Codes: G02B 5/003 Light absorbing elements
• CPC Class Codes: G02B 5/005 Diaphragms for cameras G03B9/02
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G03B 17/12 with means for supporting objectives, supplementary lenses, filters, masks, or turrets
• CPC Class Codes: G03B 9/02 Diaphragms

Abstract

An annular optical component includes an inner surface, an outer surface, an object-side surface and an image-side surface. The inner surface includes a molded anti-reflective layer structure surrounding a central axis of the annular optical component. The molded anti-reflective layer structure defines a central aperture. The outer surface includes a frame structure surrounding at least a part of the molded anti-reflective layer structure. A hardness of the frame structure is larger than a hardness of the molded anti-reflective layer structure. The object-side surface and the image-side surface respectively face toward an object side and an image side of the annular optical component. The molded anti-reflective layer structure is joined with the frame structure. The molded anti-reflective layer structure includes a tapered portion adjacent to the central aperture, and the tapered portion tapers off along a direction from the outer surface toward the inner surface.

Claims

1. An annular optical component, comprising:

an inner surface comprising a molded anti-reflective layer structure, the molded anti-reflective layer structure surrounding a central axis of the annular optical component, and the molded anti-reflective layer structure defining a central aperture;

an outer surface comprising a frame structure, the outer surface being opposite to the inner surface, the frame structure surrounding at least a part of the molded anti-reflective layer structure, and a hardness of the frame structure being larger than a hardness of the molded anti-reflective layer structure;

an object-side surface facing toward an object side of the annular optical component, and the object-side surface being connected to the outer surface and the inner surface; and

an image-side surface facing toward an image side of the annular optical component, the image-side surface being connected to the outer surface and the inner surface, and the image-side surface being opposite to the object-side surface;

wherein the molded anti-reflective layer structure is joined with the frame structure, the molded anti-reflective layer structure comprises a tapered portion adjacent to the central aperture, and the tapered portion tapers off along a direction from the outer surface toward the inner surface.

2. The annular optical component of claim 1, wherein one side of the tapered portion closer to the object-side surface tapers off toward the central aperture.

3. The annular optical component of claim 2, wherein another side of the tapered portion closer to the image-side surface tapers off toward the central aperture.

4. The annular optical component of claim 3, wherein a diameter of the outer surface is φ

o, a minimum diameter of the inner surface is φ

i, and the following condition is satisfied;

1.1<

φ

o/φ

i<

3.5.

5. The annular optical component of claim 3, wherein the tapered portion comprises an angled end.

6. The annular optical component of claim 5, wherein an angle of the angled end is θ

, and the following condition is satisfied;

46 degrees<

θ

<

136 degrees.

7. The annular optical component of claim 5, wherein a displacement in parallel with the central axis of the annular optical component between the angled end and the object-side surface is h, a thickness of the annular optical component is d, and the following condition is satisfied:

0.1<

h/d<

0.9.

8. The annular optical component of claim 7, wherein the displacement in parallel with the central axis of the annular optical component between the angled end and the object-side surface is h, the thickness of the annular optical component is d, and the following condition is satisfied:

0.3<

h/d<

0.7.

9. The annular optical component of claim 1, wherein the frame structure comprises at least one notch structure on one side thereof facing toward the object side, and the at least one notch structure extends from the object-side surface toward the image-side surface.

10. The annular optical component of claim 1, wherein the frame structure comprises at least one notch structure on one side thereof facing toward the image side, and the at least one notch structure extends from the image-side surface toward the object-side surface.

11. The annular optical component of claim 10, wherein the molded anti-reflective layer structure is made of resin material, a number of the at least one notch structure is two, the molded anti-reflective layer structure comprises at least two resin gate traces, and the at least two resin gate traces respectively correspond to the two notch structures.

12. The annular optical component of claim 1, wherein the frame structure has uneven thickness, the frame structure tapers off along either a direction from the image-side surface toward the object-side surface or a direction from the object-side surface toward the image-side surface.

13. The annular optical component of claim 1, wherein a thickness of the annular optical component is d, a minimum diameter of the inner surface is φ

i, and the following condition is satisfied;

0.15<

d/φ

i<

0.8.

14. The annular optical component of claim 1, wherein the molded anti-reflective layer structure comprises glass fiber.

15. A camera lens module, comprising the annular optical component of claim 1 and an optical lens assembly, wherein the annular optical component is disposed in the optical lens assembly.

16. The camera lens module of claim 15, wherein the molded anti-reflective layer structure comprises an axial assembling structure, the annular optical component is disposed in the optical lens assembly by the axial assembling structure, the optical lens assembly comprises a lens element adjacent to the annular optical component, and the axial assembling structure is configured to align the central axis of the annular optical component with a center of the lens element.

17. The camera lens module of claim 16, wherein only the axial assembling structure is in contact with the lens element among all parts of the molded anti-reflective layer structure.

18. The camera lens module of claim 15, wherein the optical lens assembly comprises a lens element adjacent to the annular optical component, and the molded anti-reflective layer structure is not in contact with the lens element.

19. An annular optical component, comprising:

an inner surface comprising a molded anti-reflective layer structure, the molded anti-reflective layer structure surrounding a central axis of the annular optical component, and the molded anti-reflective layer structure defining a central aperture;

an outer surface comprising a frame structure, the outer surface being opposite to the inner surface, the molded anti-reflective layer structure being joined with the frame structure, the frame structure surrounding at least a part of the molded anti-reflective layer structure, and a hardness of the frame structure being larger than a hardness of the molded anti-reflective layer structure;

an object-side surface facing toward an object side of the annular optical component, and the object-side surface being connected to the outer surface and the inner surface; and

an image-side surface facing toward an image side of the annular optical component, the image-side surface being connected to the outer surface and the inner surface, and the image-side surface being opposite to the object-side surface.

20. The annular optical component of claim 19, wherein the central aperture is non-circular.

21. The annular optical component of claim 20, wherein the central aperture has at least two arc sides.

22. The annular optical component of claim 20, wherein the central aperture has at least two straight sides.

23. The annular optical component of claim 19, wherein the molded anti-reflective layer structure comprises a molded surface structure.

24. The annular optical component of claim 23, wherein the molded surface structure comprises a plurality of straight protrusions.

25. The annular optical component of claim 23, wherein the molded surface structure comprises a plurality of annular protrusions.