Monocentric lens designs and associated imaging systems having wide field of view and high resolution

Patent metadata

Field	Value
Publication number	US-9860443-B2
Application number	US-201314423097-A
Country	US
Kind code	B2
Filing date	Aug 20, 2013
Priority date	Aug 20, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

Methods, systems, and devices are disclosed for capturing and forming large high quality images using monocentric optical imaging. In one aspect, an optical imaging system includes an optical imaging module that collects light to form an image on an imaging surface, one or more imaging sensors each including an array of optical detectors located away from the imaging surface to receive light representing the image initially formed on the imaging surface and to convert the received light into detector signals, and optical waveguides coupled between the imaging surface and the one or more imaging sensors to receive light from the imaging surface and configured to selectively deliver a desired portion of the received light to the one or more imaging sensors while suppressing undesired stray light from reaching the one or more imaging sensors so that the optical waveguides effectuate an optical aperture stop with a limited angle range for receiving light by the one or more imaging sensors.

First claim

What is claimed is:

1. An optical imaging system, comprising:
a monocentric optical imaging module including one or more optical elements having concentric surfaces to collect light and form an image on a curved image surface;
one or more curved and tapered optical waveguide bundles each comprising a plurality of optical waveguides that are optically coupled to the monocentric optical imaging module at different locations to receive different portions of the collected light at the curved image surface, respectively, wherein each optical waveguide bundle includes an input optical waveguide bundle facet to receive light from the curved image surface and an output optical waveguide facet to output light;
one or more imaging sensors to receive light from the one or more curved and tapered optical waveguide bundles and to detect the received light, the one or more imaging sensors configured to produce a representation of the image on the curved image surface of the monocentric optical imaging module; and
a textured surface structure over the input optical waveguide facet associated with optical waveguides of each curved and tapered optical waveguide bundle to enhance optical coupling from the curved imaging surface into the plurality of optical waveguides,
wherein at least one of the one or more curved and tapered optical waveguide bundles has a curved input facet, and principal rays of the monocentric optical imaging module input to the plurality of optical waveguides are substantially aligned with an axis of a corresponding optical waveguide to facilitate propagation of light through each optical waveguide in producing a substantially uniform divergence of the light that is output from each of the one or more curved and tapered optical waveguide bundles.

2. The system as in claim 1 , wherein:
the optical waveguides in each curved and tapered optical waveguide bundle include first optical waveguide portions that are bent at different bending angles, respectively, at the curved image surface of the monocentric optical imaging module.

3. The system as in claim 1 , wherein:
the textured surface structure includes a layer of micro prisms.

4. The system as in claim 1 , wherein
the textured surface structure includes one or more of the following:
a diffraction grating layer;
a locally spatially varying optically patterned layer;
a locally spatially varying optically patterned reflective layer;
a locally spatially varying optically patterned refractive layer; or
a locally spatially varying optically patterned diffractive layer.

5. The system as in claim 1 , wherein:
each curved and tapered optical waveguide bundle has a tapered exterior profile between the monocentric optical imaging module and a corresponding imaging sensor.

6. The system as in claim 1 , wherein:
each curved and tapered optical waveguide bundle includes a waveguide section having a cross section in the tapered waveguide core to decrease along a direction directed from the curved image surface to the one or more imaging sensors.

7. The system as in claim 1 , wherein:
the monocentric optical imaging module includes an optical aperture stop that transmits a restricted portion of light incident on the monocentric imaging module at small incident angles to pass through the monocentric optical imaging module while blocking light at large incident angles.

8. The system as in claim 1 , wherein:
the monocentric optical imaging module includes two or more lenses having concentric spherical surfaces.

9. The system as in claim 1 , comprising:
an array of the curved and tapered optical waveguide bundles coupled to the curved imaging surface of the monocentric imaging module at different locations, each optical waveguide bundle of the array capturing a part of the image on the curved imaging surface and different optical waveguide bundles capturing different parts of the image on the curved imaging surface, respectively;
an array of the imaging sensors respectively coupled to the different optical waveguide bundles, one imaging sensor per optical waveguide bundle; and
a microprocessor coupled to the imaging sensors to combine individual images from the array of imaging sensors into a single composite image representing the image on the curved imaging surface of the monocentric imaging module.

10. The system as in claim 9 , wherein:
the microprocessor is configured to reduce image blurring caused by optical crosstalk of the guided light between adjacent optical waveguide bundles.

Assignees

• Univ California

Inventors

• Ford Joseph E
• Agurok Ilya
• Stamenov Igor

Classifications

• H04N23/698 Primary

  for achieving an enlarged field of view, e.g. panoramic image capture · CPC title

• G02B9/02 Primary

  having one + component only (simple lenses G02B3/00) · CPC title

• H04N23/55

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

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• H04N5/2254

  Electricity · mapped topic