Multi-aperture cameras with at least one two state zoom camera

Patent metadata

Field	Value
Publication number	US-11310405-B2
Application number	US-202017293914-A
Country	US
Kind code	B2
Filing date	Feb 19, 2020
Priority date	Feb 25, 2019
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

Multi-cameras and in particular dual-cameras comprising a Wide camera comprising a Wide lens and a Wide image sensor, the Wide lens having a Wide effective focal length EFL W and a folded or non-folded Tele camera comprising a Tele lens with a first optical axis, a Tele image sensor and an OPFE, wherein the Tele lens includes, from an object side to an image side, a first lens element group G1, a second lens element group G2 and a third lens element group G3, wherein at least two of the lens element groups are movable relative to the image sensor along the first optical axis to bring the Tele lens to a Macro state or to two zoom states, wherein an effective focal length (EFL) of the Tele lens is changed from EFL T,min in one zoom state to EFL T,max in the other zoom state, wherein EFL Tmin >1.5×EFL W and wherein EFL Tmax >1.5×EFL Tmin . In the Macro state, the lens with EFL T,min allows for focusing on objects with short object-camera distances such as 5 cm. Actuators for enabling the movements are also disclosed.

First claim

What is claimed is:

1. A folded camera, comprising:
a) a lens that includes a lens element group G1, a lens element group G2 and a lens element group G3 along a lens optical axis;
b) an image sensor;
c) an optical path folding element (OPFE); and
d) an actuator for moving G1 and G3 together relative to the image sensor in a direction parallel to the lens optical axis to bring the lens to two zoom states, wherein G1 and G3 are fixedly attached to each other, wherein G2 is floating between two stops, and wherein the movement of G1 and G3 together enables attachment of G2 to G1 in one zoom state and to G3 in another zoom state.

2. The camera of claim 1 , wherein the fixed attachment between G1 and G3 is enabled by a plurality of rods connecting G1 and G3, and wherein G2 is guided by the plurality of rods and able to move along the direction parallel to the lens axis relative to the plurality of rods.

3. The camera of claim 1 , wherein the attachment of G2 to G1 or G3 is by magnetic force.

4. The camera of claim 1 , wherein the movement of G1 and G3 together is over a stroke larger than 2 mm and smaller than 20 mm, and wherein a stroke of the movement of G2 between the two stops is smaller than half of the stroke of G1 and G3.

5. The camera of claim 1 , wherein the lens has an effective focal length EFL, wherein EFL is changed from a minimal value EFL ,min in the first zoom state to a maximal value EFL max in the second zoom state and wherein a ratio EFL max /EFL ,min is >1.5.

6. The camera of claim 1 , wherein the actuator includes a shape memory alloy (SMA) actuator having a plurality of SMA springs and a plurality of mechanical springs.

7. The camera of claim 6 , wherein the plurality of SMA springs includes four springs and wherein the plurality of mechanical springs includes two springs.

8. The camera of claim 6 , further comprising a voice coil motor (VCM) mechanism for focusing the lens.

9. The camera of claim 8 , wherein the focusing of the lens is performed by moving G1+G2+G3 together.

10. The camera of claim 9 , wherein the lens is included in a lens and sensor module that also includes a G2 stop mechanism with a first G2 stop and a second G2 stop, and wherein one of the first or second G2 stops is removable to allow movement of G1+G2+G3 to be over a large stroke of not less than 2 mm for Macro-photography.

11. The camera of claim 1 , wherein the actuator includes at least three coils coupled to a plurality of respective magnets and or to magnet polarizations.

12. The camera of claim 11 , wherein a position of the at least three coils relative to the magnets is measured by at least one Hall bar sensor for position sensing.

13. The camera of claim 12 , wherein the at least three coils are driven by respective driving currents to provide movement relative to the magnets and wherein the driving currents depend on the position of the coils relative to the magnets.

14. A folded camera, comprising:
a) a lens that includes a lens element group G1, a lens element group G2 and a lens element group G3 along a lens optical axis;
b) an image sensor;
c) an optical path folding element (OPFE); and
d) a voice coil motor (VCM) mechanism for focusing the lens by moving G1+G2+G3 together in a direction parallel to the lens optical axis, and for moving G1 and G3 together relative to the image sensor for zoom in the direction parallel to the lens optical axis to bring the lens to two zoom states, wherein G1 and G3 are fixedly attached to each other, wherein G2 is floating between two stops, and wherein the movement of G1 and G3 together enables attachment of G2 to G1 in one zoom state and to G3 in another zoom state.

15. The camera of claim 14 , further including a first G2 stop and a second G2 stop, and wherein one of the first or second G2 stops is removable to allow movement of G1+G2+G3 to be over a large stroke of not less than 2 mm for Macro-photography.

16. The camera of claim 14 , wherein the VCM mechanism includes at least three coils coupled to a plurality of respective magnets and or to magnet polarizations.

17. The camera of claim 16 , wherein a position of the at least three coils relative to the magnets is measured by at least two Hall bar sensors for position sensing.

18. The camera of claim 17 , wherein the at least three coils are driven by respective driving currents to provide movement of the magnets relative to the coils and wherein the driving currents depend on the position of the coils relative to the magnets.

Assignees

• Corephotonics Ltd

Inventors

• Shabtay Gal
• Goldenberg Ephraim
• Bronstein Emil
• Yedid Itay
• Rudnick Roy
• Dror Michael
• Bachar Gil
• Kowal Yiftah

Classifications

• H04N23/55 Primary

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N23/67

  Focus control based on electronic image sensor signals · CPC title

• H04N23/69

  Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming · CPC title

• H04N23/45

  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 title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title