Thin dual-aperture zoom digital camera

• US 10,288,896 B2
• Filed: 03/11/2017
• Issued: 05/14/2019
• Est. Priority Date: 07/04/2013
• Status: Active Grant

• Current Assignee: Corephotonics Ltd. (Samsung Electronics Co. Ltd.)
• Original Assignee: Corephotonics Ltd. (Samsung Electronics Co. Ltd.)
• Inventors: Shabtay, Gal, Goldenberg, Ephraim
• Primary Examiner(s): Nguyen, Luong T
• Application Number:
  US15/456,506
• Publication Number:
  US 20170184871A1
• Time in Patent Office: 794 Days
• CPC Class Codes: G02B 1/041 Lenses
• CPC Class Codes: G02B 13/00 Optical objectives specially designed for the purposes specified below with variable magnification in general G02B15/00
• CPC Class Codes: G02B 13/002 having at least one aspherical surface
• CPC Class Codes: G02B 13/004 having four lenses
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/009 having zoom function
• CPC Class Codes: G02B 13/02 Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
• CPC Class Codes: G02B 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration G02B13/002 takes precedence
• CPC Class Codes: G02B 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 27/646 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 Class Codes: G02B 5/005 Diaphragms for cameras G03B9/02
• CPC Class Codes: G02B 9/00 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 Class Codes: G02B 9/12 having three components only
• CPC Class Codes: G02B 9/60 having five components only
• CPC Class Codes: G02B 9/62 having six components only
• CPC Class Codes: G02B 9/64 having more than six components
• CPC Class Codes: H04N 2101/00 Still video cameras
• CPC Class Codes: H04N 2201/00 Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
• CPC Class Codes: H04N 23/16 Optical arrangements associated therewith, e.g. for beam-splitting or for colour correction
• CPC Class Codes: H04N 23/45 for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
• CPC Class Codes: H04N 23/57 : Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/69 : Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
• CPC Class Codes: Y10T 29/4913 : Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A dual-aperture zoom camera comprising a Wide camera with a respective Wide lens and a Tele camera with a respective Tele lens, the Wide and Tele cameras mounted directly on a single printed circuit board, wherein the Wide and Tele lenses have respective effective focal lengths EFL_W and EFL_T and respective total track lengths TTL_W and TTL_T and wherein TTL_W/EFL_W>1.1 and TTL_T/EFL_T<1.0. Optionally, the dual-aperture zoom camera may further comprise an optical OIS controller configured to provide a compensation lens movement according to a user-defined zoom factor (ZF) and a camera tilt (CT) through LMV=CT*EFL_ZF, where EFL_ZF is a zoom-factor dependent effective focal length.

Claims

1. A dual-aperture zoom camera, comprising:

a) a Wide camera that includes a Wide lens with an effective focal length EFL_W and a total track length TTL_W; and

b) a Tele camera that includes a Tele lens with five lens elements and with an effective focal length EFL_T, a total track length TTL_T and a F number smaller than 3.2,

wherein the respective Wide and Tele lens total track lengths and effective focal lengths fulfill the conditions TTL_W/EFL_W>

1.1 and TTL_T/EFL_T<

1.0, wherein the Tele lens comprises, in order from an object side to an image side of the Tele lens and along an optical axis of the Tele lens, first, second, third, fourth and fifth lens elements, wherein a focal length f₁ of the first lens element of the Tele lens is smaller than TTL_T/2.

2. The dual-aperture zoom camera of claim 1, wherein a height difference between the Tele and Wide cameras is equal to or smaller than 1.65 mm.

3. The dual-aperture zoom camera of claim 1, wherein a ratio e=EFL_T/EFL_W between the effective focal lengths of the Tele and Wide cameras is in the range 1.3-2.0.

4. The dual-aperture zoom camera of claim 3, wherein a ratio TTL_T/TTL_W between the total track lengths of the Tele and Wide cameras is smaller than 0.8e.

5. The dual-aperture zoom camera of claim 1, wherein a height of the dual-aperture zoom camera has a value between 4 mm and 8 mm.

6. The dual-aperture zoom camera of claim 1, wherein an air gap between the third lens element and the fourth lens element is greater than TTL_T/5.

7. The dual-aperture zoom camera of claim 1, wherein an air gap between the first lens element and the second lens element is smaller than half a width of the second lens element.

8. The dual-aperture zoom camera of claim 1, wherein an air gap between the fourth lens element and the fifth lens element is smaller than 1.5 times a width of the fifth lens element.

9. The dual-aperture zoom camera of claim 1, wherein the F number is substantially equal to 2.8.

10. The dual-aperture zoom camera of claim 1, wherein the fourth lens element and the fifth lens element have different dispersions.

11. The dual-aperture zoom camera of claim 1, wherein the fourth and fifth lens elements have opposite refractive power signs.

12. The dual-aperture zoom camera of claim 1, wherein the third lens element has negative refractive power.

13. The dual-aperture zoom camera of claim 5, wherein the fourth lens element and the fifth lens element have opposite refractive power signs.

14. The dual-aperture zoom camera of claim 5, wherein the third lens element has negative refractive power.

15. A dual-aperture zoom camera, comprising:

a) a Wide camera that includes a Wide lens with an effective focal length EFL_W and a total track length TTL_W, wherein TTL_W/EFL_W>

1.1, and

b) a Tele camera that comprises a Tele lens with an effective focal length EFL_T, a total track length TTL_T of 6 millimeters or less and a ratio TTL_T/EFL_T<

1.0, wherein the Tele lens includes, in order from an object side to an image side, a first lens element L₁ with positive refractive power and a focal length f₁, a second lens element L₂ with negative refractive power and a focal length f₂, a third lens element L₃ with negative refractive power and a focal length f₃, a fourth lens element L₄, and a fifth lens element L₅, and wherein 1.2×

|f₃|>

|f₂|>

1.5×

f₁.

16. The dual-aperture zoom camera of claim 15, wherein the Tele lens has a F number smaller than 2.9.

17. The dual-aperture zoom camera of claim 15, wherein lens element L₁ has a convex image-side surface.

18. The dual-aperture zoom camera of claim 15, wherein lens element L₁ has a concave image-side surface.

19. The dual-aperture zoom camera of claim 15, wherein lens element L₁ has an image-side surface diameter between 2.3 mm and 2.5 mm.

20. A dual-aperture zoom camera, comprising:

a) a Wide camera that includes a Wide lens with an effective focal length EFL_W and a total track length TTL_W, wherein TTL_W/EFL_W>

1.1; and

b) a Tele camera that comprises a Tele lens having, in order from an object side to an image side, a first lens element L₁ with positive refractive power and a focal length f₁, a second lens element L₂ with negative refractive power, a third lens element L₃, a fourth lens element L₄, and a fifth lens element L₅,

wherein the Tele lens has an effective focal length EFL_T, a total track length TTL_T of 6.0 millimeters or less and a ratio TTL_T/EFL_T<

1.0, wherein a F number of the Tele lens is smaller than 2.9, wherein f₁ is smaller than TTL_T/2, wherein lens elements L₃ and L₄ are separated by a gap greater than TTL_T/5, wherein lens elements L₄ and L₅ are separated by a gap smaller than TTL_T/20, and wherein the five lens elements are made of plastic.

21. The dual-aperture zoom camera of claim 20, wherein F number=2.8.

22. The dual-aperture zoom camera of claim 20, wherein the ratio TTL_T/EFL_T is between 0.85 and 0.95.

23. The dual-aperture zoom camera of claim 20, wherein a combined power of lens elements L₂ and L₃ is negative.