IMAGING LENS ASSEMBLY, CAMERA MODULE AND ELECTRONIC DEVICE

• US 20200132968A1
• Filed: 07/09/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• 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 11,237,361 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• CPC Class Codes: G02B 13/0035 having three lenses
• CPC Class Codes: G02B 7/003 Alignment of optical elements G02B7/001, G02B7/002 take precedence; for mirrors G02B7/1822
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G02B 7/022 lens and mount having complementary engagement means, e.g. screw/thread
• CPC Class Codes: G02B 7/026 using retaining rings or springs G02B7/027 takes precedence
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

An imaging lens assembly includes lens elements, a metal spacing structure and at least one blocking sheet. At least one lens element is a plastic lens element. The metal spacing structure is for maintaining the plastic lens element in a space between two sides thereof and two of the lens elements adjacent thereto, respectively. The metal spacing structure includes, in order from an object side to an image side, a first spacing ring having a first through hole and a second spacing ring having a second through hole, wherein the second through hole is larger than the first through hole. At least one of the first spacing ring and the second spacing ring is made of metal material. The blocking sheet is disposed between two of the lens elements, and is not disposed between the first spacing ring and the second spacing ring.

Claims

1. An imaging lens assembly, comprising:

a plurality of lens elements, wherein at least one of the lens elements is a plastic lens element;

a metal spacing structure for maintaining the plastic lens element in a space between two sides thereof and two of the lens elements adjacent thereto, respectively, and the metal spacing structure comprising, in order from an object side to an image side;

a first spacing ring having a first through hole; and

a second spacing ring having a second through hole, wherein the second through hole is larger than the first through hole, and at least one of the first spacing ring and the second spacing ring is made of metal material; and

at least one blocking sheet disposed between two of the lens elements, wherein all of the at least one blocking sheet is not disposed between the first spacing ring and the second spacing ring of the metal spacing structure;

wherein a thickness of the first spacing ring is t1, a distance between the first spacing ring and the second spacing ring is d, and the following condition is satisfied;

0.1<

t1/d<

2.0.

2. The imaging lens assembly of claim 1, wherein the first spacing ring is made of metal material and an appearance of the first spacing ring is black.

3. The imaging lens assembly of claim 2, wherein a cross section of an inner annular surface of the first spacing ring is a V-shaped groove which is tapered in a direction from a position close to the first through hole to a position away from the first through hole.

4. The imaging lens assembly of claim 2, wherein a thickness of the second spacing ring is t2, the distance between the first spacing ring and the second spacing ring is d, and the following condition is satisfied:

0.5<

t2/d<

2.0.

5. The imaging lens assembly of claim 4, wherein an outer diameter of the first spacing ring, an outer diameter of the plastic lens element and an outer diameter of the second spacing ring are different, and the outer diameter of the second spacing ring is larger than the outer diameter of the first spacing ring and the outer diameter of the plastic lens element, the outer diameter of the plastic lens element is larger than the outer diameter of the first spacing ring.

6. The imaging lens assembly of claim 5, wherein the at least one blocking sheet is disposed on an object side of the first spacing ring and is not directly contacted with the first spacing ring.

7. The imaging lens assembly of claim 2, wherein the thickness of the first spacing ring is t1, the distance between the first spacing ring and the second spacing ring is d, and the following condition is satisfied:

0.1<

t1/d<

1.3.

8. The imaging lens assembly of claim 7, wherein the second spacing ring comprises a metal material portion, the metal material portion surrounds the second through hole, and the metal material portion of the second spacing ring is directly contacted with the plastic lens element for maintaining the space between one of the two sides of the plastic lens element and one of the two lens elements adjacent to the side which is an image side of the plastic lens element.

9. The imaging lens assembly of claim 8, wherein the second spacing ring further comprises a plastic material portion, an appearance of the plastic material portion is black, the plastic material portion surrounds the second through hole, and the plastic material portion is closer to the second through hole than the metal material portion is thereto.

10. The imaging lens assembly of claim 9, wherein the metal material portion is embedded in the plastic material portion by an insert molding method.

11. The imaging lens assembly of claim 1, wherein both of the first spacing ring and the second spacing ring are made of metal material and appearances of the first spacing ring and the second spacing ring are black.

12. The imaging lens assembly of claim 11, wherein a cross section of the inner annular surface of the second spacing ring is a V-shaped groove which is tapered in a direction from a position close to the second through hole to a position away from the second through hole.

13. The imaging lens assembly of claim 12, wherein a minimum inner diameter of the second through hole is larger than an outer diameter of one of the lens elements closest to the object side of the imaging lens assembly.

14. The imaging lens assembly of claim 12, wherein a minimum inner diameter of the second through hole is larger than each of outer diameters of the lens elements on an object side of the first spacing ring.

15. A camera module, comprising:

the imaging lens assembly of claim 1.

16. An electronic device, comprising:

the camera module of claim 15; and

an image sensor disposed on an image surface of the imaging lens assembly of the camera module.