IP Library › Granted Patent US 12,313,824
Granted Patent B2
US 12,313,824 · App. 18/938,337 · Granted May 27, 2025

Miniature telephoto lens assembly

Inventors: Michael Dror (Tel Aviv, IL); Ephraim Goldenberg (Tel Aviv, IL); Gal Shabtay (Tel Aviv, IL)
Assignee: Corephotonics Ltd.
G02B13/0045G02B1/041G02B9/60G02B13/02G02B27/0025G02B27/646G02B5/005G02B9/00G02B13/002H04N2101/00H04N2201/00Y10T29/4913
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Quick Facts
Patent No.
US 12,313,824
App. No.
18/938,337
Granted
May 27, 2025
Kind
B2
Abstract

An optical lens assembly includes five lens elements and provides a TTL/EFL<1.0. In an embodiment, the focal length of the first lens element f1<TTL/2, an air gap between first and second lens elements is smaller than half the second lens element thickness, an air gap between the third and fourth lens elements is greater than TTL/5 and an air gap between the fourth and fifth lens elements is smaller than about 1.5 times the fifth lens element thickness. All lens elements may be aspheric.

Claims (37)

1. A lens system, comprising:

a lens assembly that includes a plurality of refractive lens elements arranged along an optical axis and including, in order from an object side to an image side, a first group comprising a first lens element having a positive refractive power, a second lens element and a third lens element, and a second group comprising a first lens element and a second lens element,

a stop positioned before the first lens element of the first group; and

a window positioned between the plurality of refractive lens elements and an image plane,

wherein a smallest gap between lens elements is d MIN ,

wherein a largest gap between lens elements d MAX is a gap between the first and second groups,

wherein d MAX is larger than 2.25 times any other gap between lens elements,

wherein at least one surface of at least one of the plurality of refractive lens elements is aspheric,

wherein the lens assembly has an effective focal length EFL and a total track length TTL, a ratio TTL/EFL smaller than 0.9, and a f number f #smaller than 2.9,

wherein a center thickness of each lens element is equal to or larger than 0.2 mm,

wherein a focal length f1 of the first lens element of the first group, a focal length f2 of the second lens element of the first group and a focal length f3 of the third lens element of the first group fulfill the condition 1.2×|f3|>|f2|>1.5×f1,

wherein a ratio L 11 /L 1 e between a largest optical axis thickness L 11 and a circumferential edge thickness L 1 e of the first lens element of the first group is smaller than 3.5, and

wherein the lens system is embedded in a mobile device.

2. The lens system of claim 1 , wherein d MAX is larger than 2.5 times any other gap between lens elements.

3. The lens system of claim 1 , wherein d MAX is larger than 2.6 times any other gap between lens elements.

4. The lens system of claim 1 , wherein d MAX is larger than 2.75 times any other gap between lens elements.

5. The lens system of claim 1 , wherein d MIN <0.25 mm.

6. The lens system of claim 1 , wherein d MIN <0.2 mm.

7. The lens system of claim 1 , wherein d MIN <0.15 mm.

8. The lens system of claim 1 , wherein a ratio d MIN /d MAX <0.2.

9. The lens system of claim 1 , wherein a ratio d MIN /d MAX <0.15.

10. The lens system of claim 1 , wherein d MIN <0.2 mm, and wherein a ratio d MIN /d MAX <0.2.

11. The lens system of claim 1 , wherein d MIN <0.15 mm, and wherein a ratio d MIN /d MAX <0.15.

12. The lens system of claim 1 , wherein the first group includes three lens elements.

13. The lens system of claim 1 , wherein the second group includes two lens elements.

14. The lens system of claim 1 , wherein the lens assembly includes five refractive lens elements.

15. The lens system of claim 1 , wherein f #≥2.8.

16. The lens system of claim 1 , wherein a ratio d MAX /TTL>0.2.

17. The lens system of claim 1 , wherein a ratio d MAX /TTL>0.25.

18. The lens system of claim 1 , wherein a ratio d MAX /TTL>0.3.

19. The lens system of claim 1 , wherein the second lens element of the first group has negative refractive power.

20. The lens system of claim 1 , wherein the first group includes a third lens element with negative refractive power.

21. The lens system of claim 1 , wherein the second group includes two adjacent lens elements having opposite refractive powers.

22. The lens system of claim 1 , wherein a focal length f1 of the first lens element of the first lens group is smaller than TTL/2.

23. The lens system of claim 1 , wherein all lens element surfaces are aspheric.

24. The lens system of claim 1 , wherein the mobile device is a smartphone.

25. The lens system of claim 1 , wherein the mobile device is a tablet.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 6, 2024
From: DROR, MICHAEL; GOLDENBERG, EPHRAIM; SHABTAY, GAL
To: COREPHOTONICS LTD.
Reel/Frame 069151/0558 →
Continuity (18)
Continuation 18604959 · Mar 14, 2024
Continuation 18504395 · Nov 8, 2023
Continuation 18054905 · Nov 13, 2022
Continuation 17499878 · Oct 13, 2021
Continuation 16872934 · May 12, 2020
Continuation 16829804 · Mar 25, 2020
Continuation 16665977 · Oct 28, 2019
Continuation 16296272 · Mar 8, 2019
Continuation 15976391 · May 10, 2018
Continuation 15976422 · May 10, 2018
Continuation 15817235 · Nov 19, 2017
Continuation 15817235 · Nov 19, 2017
Continuation 15418925 · Jan 30, 2017
Continuation In Part 15170472 · Jun 1, 2016
Continuation 14932319 · Nov 4, 2015
Continuation 14367924
Provisional Application 61842987 · Jul 4, 2013
Related Publication 20250060569A1 · Feb 20, 2025
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