Optical assembly for a compact wide field of view digital camera with low lateral chromatic aberration
First Claim
1. An optical assembly for a point action camera having a wide field of view, comprising multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end:
- a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view,a second optical group including two or more lens elements,a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and
an aperture stop between said second and third optical groups;
the optical assembly further comprising a MTF at Nyquist frequency, approximately 200 line pairs per millimeter, above 0.35 and a MTF at half Nyquist frequency, approximately 100 line pairs per millimeter, above 0.55.
3 Assignments
0 Petitions
Accused Products
Abstract
An optical assembly for a point action camera or other compact digital camera having a wide field of view, includes multiple lens elements, including at least one lens element that has an aspheric lens surface. The optical assembly is configured to provide a field of view in excess of 120 degrees. The optical assembly comprises less than two pixels or five microns of lateral chromatic aberration.
270 Citations
28 Claims
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1. An optical assembly for a point action camera having a wide field of view, comprising multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end:
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a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups; the optical assembly further comprising a MTF at Nyquist frequency, approximately 200 line pairs per millimeter, above 0.35 and a MTF at half Nyquist frequency, approximately 100 line pairs per millimeter, above 0.55. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical assembly for a point action camera having a wide field of view, comprising:
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multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end; a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups, and wherein the optical assembly comprises a ratio of total track length to effective focal length (hereinafter “
TTL/EFL”
) that is less than 8. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An optical assembly for a point action camera having a wide field of view, comprising:
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multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end; a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups, and a fourth optical group configured to deliver a telecentric cone to the image sensor. - View Dependent Claims (18, 19)
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20. An optical assembly for a point action camera having a wide field of view, comprising:
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multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end; a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups, and wherein at least one aspheric surface comprises an aspheric sag less than approximately 12 microns. - View Dependent Claims (21, 22)
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23. An optical assembly for a point action camera having a wide field of view, comprising:
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multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end; a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups, and wherein at least one aspheric surface comprises an aspheric sag slope less than approximately 15 microns per millimeter. - View Dependent Claims (24, 25)
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26. An optical assembly for a point action camera having a wide field of view, comprising:
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multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, the optical assembly comprising from object end to image end; a first optical group including two or more lens elements configured to collect and reduce a field angle of light incident at said wide field of view, a second optical group including two or more lens elements, a third optical group including two or more lens elements, wherein at least one lens element of the third optical group includes an aspheric surface that is configured to correct higher order astigmatism; and an aperture stop between said second and third optical groups, wherein the optical assembly comprises a single aspheric lens element, which is the only aspheric lens element within the optical assembly, wherein lens elements other than the single aspheric lens element comprise spherical or planar lens surfaces, or both, each without significant aspheric departure.
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27. An optical assembly for a point action camera having a wide field of view, comprising:
- multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, and
wherein axial chromatic aberration is less than 0.025 microns, and wherein the axial chromatic aberration is defined across a spectral band between 465 nm to 650 nm, and wherein at least one aspheric surface comprises an aspheric sag less than approximately 12 microns and an aspheric sag slope less than approximately 15 microns per millimeter. - View Dependent Claims (28)
- multiple lens elements, including one or more aspheric lens surfaces, configured to provide a field of view in excess of 120 degrees and comprises less than five microns of lateral chromatic aberration, and
Specification