Method to design ultra-wide angle miniature lens
AssigneeImmervision, Inc.
InventorsZhenfeng Zhuang, Jocelyn Parent, Xavier Dallaire, Simon Thibault, Patrice Roulet
Life of this patent
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Abstract
Miniature optical lenses are disclosed having a ratio of the optical image diameter divided by the total track length that is greater than 0.85. These thin optical lenses are often used in applications requiring large image sensors and small thickness like in consumer electronic applications. The miniature optical lenses presented have fields of view between 130° and 170° or more specifically inside the well-desired 140° to 160° field of view range in order to cover the ultra-wide-angle field of view range. The optical lenses presented also respect some dimensionless ratios in order to maximize the optical performance of the lenses.
Claims19
An optical imaging system comprising a plurality of optical elements configured to form an optical image having an image diameter in an image plane, the optical system having a field of view between 140° and 160° and the following characteristics:
- a. a ratio of the image diameter divided by a total track length of the optical system is between 0.85 and 1.3,
- b. a ratio of the image diameter divided by a clear aperture diameter of a first optical element of the plurality of optical elements is between 1.4 and 3.4,
- c. a ratio of the image diameter divided by a focal length of the optical system is between 2.5 and 4.5,
- d. a ratio of the image diameter divided by a focal length of the first optical element is between −2.2 and −1.3, and
- e. a ratio of the total track length of the optical system divided by the focal length of the optical system is between 2.1 and 4.8.
A method for designing an optical imaging system, the method comprising providing a plurality of optical elements configured to form an optical image having an image diameter in an image plane, the optical system having a field of view between 140° and 160° and the following characteristics:
- a. a ratio of the image diameter divided by a total track length of the optical system is between 0.85 and 1.3,
- b. a ratio of the image diameter divided by a clear aperture diameter of a first optical element of the plurality of optical elements is between 1.4 and 3.4,
- c. a ratio of the image diameter divided by a focal length of the optical system is between 2.5 and 4.5,
- d. a ratio of the image diameter divided by a focal length of the first optical element is between −2.2 and −1.3, and
- e. a ratio of the total track length of the optical system divided by the focal length of the optical system is between 2.1 and 4.8.
An optical imaging system comprising a plurality of optical elements having an optical power and configured to form an optical image having an image diameter in an image plane, the optical system having a field of view between 130° and 170° and the following characteristics:
- a. a ratio of the image diameter divided by a total track length of the optical system is between 0.85 and 1.3,
- b. a ratio of the image diameter divided by a clear aperture diameter of a first optical element of the plurality of optical elements is between 1.4 and 3.4,
- c. a ratio of the image diameter divided by a focal length of the optical system is between 2.5 and 4.5,
- d. a ratio of the image diameter divided by a focal length of the first optical element is between −2.2 and −1.3, and
- e. a ratio of the total track length of the optical system divided by the focal length of the optical system is between 2.1 and 4.8,
- wherein the plurality of optical elements comprises seven or eight optical elements having an optical power.
Dependencies are inferred from the claim text.