Transmitters for optical narrowcasting
First Claim
1. A transmitter comprising:
- a data-format converter configured to convert data to an optical format for optical transmission;
a light source;
a light source driver configured to receive data from the data-format converter and control the light source to transmit the converted data;
a collimator rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the collimator comprising a body between a circular entrance pupil and a circular exit pupil, wherein the collimator is positioned to receive light from the light source through the circular entrance pupil and emit the light from the circular exit pupil, wherein the body comprises a first portion and a second portion, wherein the first portion comprises a first body between a circular first entrance pupil and a circular first exit pupil, the first body having a diameter greater than a diameter of the first entrance pupil and greater than a diameter of the first exit pupil, and wherein the second portion comprises a second body between a circular second entrance pupil and a circular second exit pupil, the second entrance pupil coupled to the first exit pupil; and
a pair of lenslet arrays positioned in front of an exit pupil of the collimator wherein the pair of lenslet arrays are homogenizers to improve uniformity of light output from an exit pupil of the collimator.
2 Assignments
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Accused Products
Abstract
Systems and methods for optical narrowcasting are provided for transmitting various types of content. Optical narrowcasting content indicative of the presence of additional information along with identifying information may be transmitted. The additional information (which may include meaningful amounts of advertising information, media, or any other content) may also be transmitted as optical narrowcasting content. Elements of an optical narrowcasting system may include optical transmitters and optical receivers which can be configured to be operative at distances ranging from, e.g., 400 meters to 1200 meters. Moreover, the elements can be implemented on a miniaturized scale in conjunction with small, user devices such as smartphones, thereby also realizing optical ad-hoc networking, as well as interoperability with other types of data networks. Optically narrowcast content can be used to augment a real-world experience, enhance and/or spawn new forms of social-media and media content.
309 Citations
26 Claims
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1. A transmitter comprising:
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a data-format converter configured to convert data to an optical format for optical transmission; a light source; a light source driver configured to receive data from the data-format converter and control the light source to transmit the converted data; a collimator rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the collimator comprising a body between a circular entrance pupil and a circular exit pupil, wherein the collimator is positioned to receive light from the light source through the circular entrance pupil and emit the light from the circular exit pupil, wherein the body comprises a first portion and a second portion, wherein the first portion comprises a first body between a circular first entrance pupil and a circular first exit pupil, the first body having a diameter greater than a diameter of the first entrance pupil and greater than a diameter of the first exit pupil, and wherein the second portion comprises a second body between a circular second entrance pupil and a circular second exit pupil, the second entrance pupil coupled to the first exit pupil; and a pair of lenslet arrays positioned in front of an exit pupil of the collimator wherein the pair of lenslet arrays are homogenizers to improve uniformity of light output from an exit pupil of the collimator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmitter comprising:
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a light source; and a collimator, comprising; a first portion rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the first portion comprising a body between a circular first entrance pupil and a circular first exit pupil, the body having a diameter greater than a diameter of the first entrance pupil and greater than a diameter of the first exit pupil; and a second portion rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the second portion comprising a flared body between a circular second entrance pupil and a circular second exit pupil, the second entrance pupil coupled to the first exit pupil, a diameter of the second exit pupil being greater than the diameter of the body of the first portion, wherein the collimator is positioned to receive light from the light source through the first entrance pupil and emit the light from the second exit pupil. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system, comprising:
a plurality of transmitters, each of the plurality of transmitters comprising; a data-format converter configured to convert data to an optical format for optical transmission; a light source; a light source driver configured to receive data from the data-format converter and control the light source to transmit the converted data; a collimator rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the collimator comprising a body between a circular entrance pupil and a circular exit pupil, wherein the collimator is positioned to receive light from the light source through the circular entrance pupil and emit the light from the circular exit pupil, wherein the body comprises a first portion and a second portion, wherein the first portion comprises a first body between a circular first entrance pupil and a circular first exit pupil, the first body having a diameter greater than a diameter of the first entrance pupil and greater than a diameter of the first exit pupil, and wherein the second portion comprises a second body between a circular second entrance pupil and a circular second exit pupil, the second entrance pupil coupled to the first exit pupil; and one or more lenslet arrays positioned in front of an exit pupil of the collimator wherein the one or more lenslet arrays are homogenizers to improve uniformity of light output from an exit pupil of the collimator. - View Dependent Claims (21, 22)
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23. A collimator, comprising:
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a first portion comprising a reflective inner surface configured to be rotationally symmetric about an optical axis substantially centered on a light-emitting element of a light source, the first portion comprising a body between a circular first entrance pupil and a circular first exit pupil, the body having a diameter greater than a diameter of the first entrance pupil and greater than a diameter of the first exit pupil; and a second portion comprising a reflective inner surface configured to be rotationally symmetric about an optical axis substantially centered on a light-emitting element of the light source, the second portion comprising a flared body between a circular second entrance pupil and a circular second exit pupil, the second entrance pupil coupled to the first exit pupil, a diameter of the second exit pupil being greater than the diameter of the body of the first portion, wherein the collimator is configured to receive light from the light source through the first entrance pupil and emit the light from the second exit pupil. - View Dependent Claims (24, 25, 26)
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Specification