Miniature telephoto lens assembly

Patent metadata

Field	Value
Publication number	US-12399349-B2
Application number	US-202519063340-A
Country	US
Kind code	B2
Filing date	Feb 26, 2025
Priority date	Jul 4, 2013
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

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.

First claim

What is claimed is:

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 lens group comprising at least three lens elements, and a second lens group comprising at least two lens elements, the lens assembly having an effective focal length EFL and a total track length TTL;
a stop positioned before the first lens element of the first lens group; and
a window positioned between the plurality of refractive lens elements and an image plane,
wherein all the lens elements are made of plastic,
wherein a largest gap between lens elements d MAX is a gap between the first and second lens groups,
wherein at least one surface of at least one of the plurality of refractive lens elements is aspheric,
wherein TTL/EFL<0.9, d MAX /TTL>0.2 and a f number f #<2.9,
wherein a center thickness of each lens element is equal to or larger than 0.2 mm,
and wherein the lens system is included in a mobile device.

2. The lens system of claim 1 , wherein d MAX is larger than 2.25 times any other gap between lens elements.

3. The lens system of claim 1 , wherein d MAX is larger than 2.5 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 a smallest gap between lens elements is d MIN , wherein d MIN <0.25 mm.

6. The lens system of claim 5 , wherein d MIN <0.2 mm.

7. The lens system of claim 5 , wherein d MIN <0.15 mm.

8. The lens system of claim 5 , wherein a ratio d MIN /d MAX <0.2.

9. The lens system of claim 5 , wherein a ratio d MIN /d MAX <0.15.

10. The lens system of claim 5 , wherein d MIN <0.2 mm, and wherein a ratio d MIN /d MAX <0.2.

11. The lens system of claim 5 , 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 lens assembly includes five refractive lens elements.

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

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

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

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

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

18. 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.

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

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

Assignees

• Corephotonics Ltd

Inventors

• Dror Michael
• Goldenberg Ephraim
• Shabtay Gal

Classifications

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• Y10T29/4913

  Assembling to base an electrical component, e.g., capacitor, etc. · CPC title

• H04N2101/00

  Still video cameras · CPC title

• G02B1/041

  Lenses · CPC title

• G02B9/00

  Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - (G02B15/00 takes precedence) · CPC title