Methods and apparatus for implementing a camera device supporting a number of different focal lengths
Methods and apparatus for using optical chains, e.g., camera modules, with different lens configurations to support a wide range of focal lengths are described. In some embodiments a camera device includes a plurality of optical chains. In at least some embodiments non-circular outer lenses are used for optical chains with large focal lengths while optical chains of the same camera device which have smaller focal lengths use round outer lenses. Thus an exemplary camera device supports a number of different focal lengths.
1. A camera device, comprising:
a first optical chain having a first focal length, said first optical chain having a first non-circular aperture and including a first mirror for directing light that passes through said first non-circular aperture towards a first sensor, said first sensor being positioned closer to a center portion of said camera device than said first non-circular aperture;
a second optical chain having a second focal length, said second optical chain having a second non-circular aperture, and including a second mirror for directing light that passes through said second non-circular aperture towards a second sensor, said second sensor being positioned closer to the center portion of said camera device than said second non-circular aperture; and
a third optical chain located in the center portion of said camera device, said third optical chain having a first circular aperture and a third sensor, said third optical chain having an optical axis extending in a straight manner from the front of the camera device towards the back of the camera device.
2. The camera device of claim 1 ,
wherein the third optical chain has a third focal length which is smaller than said first and second focal lengths.
3. The camera device of claim 2 ,
wherein said center portion of said camera device is positioned between a top and a bottom of said camera device; and
wherein the third optical chain has a field of view which includes at least a majority of a field of view of the first and second optical chains.
4. The camera device of claim 3 , wherein said first optical chain is positioned closer to the top of the camera device than the bottom of said camera device;
wherein said second optical chain is positioned closer to the bottom of the camera device than the top of the camera device; and
wherein said first circular aperture of the third optical chain is closer to the bottom of the camera device than said first non-circular aperture of the first optical chain and closer to the top of the camera device than said second non-circular aperture of the second optical chain.
5. The camera device of claim 4 ,
wherein said third sensor is mounted in a first plane which extends parallel to the front of said camera device.
6. The camera device of claim 5 , wherein said third optical chain does not include a mirror.
7. The camera device of claim 2 , wherein the overall length of said third optical chain is less than the depth of the camera device.
8. The camera device of claim 1 , wherein the first and second focal lengths are the same.
9. The camera device of claim 1 , further comprising:
a fourth optical chain having a fourth focal length and a second circular aperture, said fourth focal length being larger than said third focal length and smaller than said first focal length, said fourth optical chain including a third mirror for directing light that passes through said second circular aperture towards a fourth sensor located in said fourth optical chain, said second non-circular aperture being positioned closer to the center portion of the camera device than said top of the camera device; and
a fifth optical chain having the same focal length as said fourth optical chain and a third circular aperture, said fifth optical chain including a fourth mirror for directing light that passes through said third circular aperture towards a fifth sensor located in said fifth optical chain, said third circular aperture being located closer to said center portion of said camera device than to the bottom of the camera device.
10. The camera device of claim 9 ,
wherein said first, second, third and fourth mirrors are movable mirrors.
11. The camera device of claim 10 wherein said first and second optical chains have optical axis portions which extend parallel to each other but in opposite directions within the camera device.
12. The camera device of claim 11 , wherein said fourth and fifth optical chains have optical axis portions which extend parallel to each other but in opposite directions within the camera device.
13. A camera device, comprising:
a first optical chain having a first focal length and a first non-circular lens, said first optical chain including a first sensor and a first light redirection element extending in at least one direction by an amount which is greater than the depth of the camera device;
a second optical chain having a second focal length and a second non-circular lens, said second optical chain including a second sensor and a second light redirection element extending in at least one direction by an amount which is greater than the depth of the camera device;
a third optical chain having a third focal length; and
a processor coupled to said first and second sensors for combining images captured by said first and second sensors to generate a composite image; and
wherein said first and second focal lengths are equal to or greater than 70 mm and said third focal length is less than 70 mm.
14. The camera device of claim 13 ,
wherein said first and second sensors have the same number of pixels; and
wherein said third optical chain includes a third sensor having the same number of pixels as said first and second sensors.
15. A non-transitory computer readable medium, said non-transitory computer readable medium comprising computer executable instructions, said non-transitory computer readable medium comprising:
instructions, which when executed by a processor, control a first optical chain of a camera to capture a first image during a first time period, said first optical chain having a first focal length and a first non-circular aperture and including a first mirror for directing light that passes through said first non-circular aperture towards a first sensor, said first sensor being positioned closer to a center portion of said camera device than said first non-circular aperture; and
instructions, which when executed by said processor, control a second optical chain of said camera to capture a second image during said first time period, said second optical chain having a second focal length and a second non-circular aperture, and including a second mirror for directing light that passes through said second non-circular aperture towards a second sensor, said second sensor being positioned closer to the center portion of said camera device than said second non-circular aperture; and
instructions, which when executed by said processor, control a third optical chain of said camera to capture a third image, said third optical chain being located in the center portion of said camera and having a first circular aperture and a third sensor, said third optical chain having an optical axis extending in a straight manner from the front of the camera towards the back of the camera.
16. A method of operating a camera, comprising:
capturing a first image, using a first optical chain of said camera, during a first time period, said first optical chain having a first focal length and a first non-circular aperture and including a first mirror for directing light that passes through said first non-circular aperture towards a first sensor, said first sensor being positioned closer to a center portion of said camera device than said first non-circular aperture;
capturing a second image, using a second optical chain of said camera during said first time period, said second optical chain having a second focal length and a second non-circular aperture, and including a second mirror for directing light that passes through said second non-circular aperture towards a second sensor, said second sensor being positioned closer to the center portion of said camera device than said second non-circular aperture; and
capturing a third image, using a third optical chain of said camera located in the center portion of said camera, said third optical chain having a first circular aperture and a third sensor, said third optical chain having an optical axis extending in a straight manner from the front of the camera towards the back of the camera.
17. The method of claim 16 ,
wherein said third optical chain has a third focal length which is smaller than said first and second focal lengths.
18. The method of claim 17 , wherein said center portion of said camera is positioned between a top and a bottom of said camera; and
wherein the third optical chain has a field of view which includes at least a majority of a field of view of the first and second optical chains.
19. The method of claim 18 , wherein said first optical chain is positioned closer to the top of the camera than the bottom of said camera;
wherein said second optical chain is positioned closer to the bottom of the camera than the top of the camera; and
wherein said first circular aperture of the third optical chain is closer to the bottom of the camera than said first non-circular aperture of the first optical chain and closer to the top of the camera than said second non-circular aperture of the second optical chain.
20. The method of claim 16 ,
wherein said third sensor is mounted in a first plane which extends parallel to the front of said camera.
21. The method of claim 16 , wherein the first and second focal lengths are the same.