Imaging device with focus offset compensation
AssigneeEther Precision, Inc.
InventorJean-Pierre Lusinchi
Life of this patent
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Abstract
An imaging device comprises a lens barrel having a lens opening, and a lens positioned in the lens opening of the lens barrel, the lens having an optical center, a focal length F, an aperture diameter D, and an aperture number FN=F/D. An image sensor comprises an array of light sensing pixels that each have a dimension P, the sensor spaced apart a distance S from the optical center of the lens such that a focus offset gap X=F−S. The pixel dimension P and aperture number FN are selected such that 2·P·FN≧X.
Claims17
An imaging device comprising:
- (a) a lens barrel having a lens opening;
- (b) a lens positioned in the lens opening of the lens barrel, the lens having an optical center, a focal length F, an aperture diameter D, and an aperture number FN=F/D;
- and
- (c) an image sensor comprising an array of light sensing pixels that each have a dimension P, the sensor being spaced apart a distance S from the optical center of the lens, and
- wherein a focus offset gap X=F−S, and
- wherein P and FN are selected such that 2·P·FN≧X.
An imaging device comprising:
- (a) a housing comprising a lens barrel having a lens opening, the lens opening having a circumferential edge;
- (b) a lens positioned in the lens opening of the lens barrel, the lens barrel comprising an outer circumference and an aperture number FN;
- and
- (c) an adhesive to adhere the outer circumference of the lens to the circumferential edge of the lens opening, the adhesive having a thickness T that contributes to the focus offset gap X;
- and
- (d) an image sensor comprising an array of light sensing pixels that each have a dimension P such that 2·P·FN≧X.
A method of forming an imaging device, the method comprising:
- (a) providing a lens barrel having a lens opening;
- (b) positioning a lens in the lens opening of the lens barrel, the lens having a focal length F, an aperture diameter D, and an aperture number FN=F/D;
- (c) placing an image sensor at a distance S from the optical center of the lens such that a focus offset gap X=F−S, the sensor comprising an array of light sensing pixels that each have a dimension P;
- and
- (d) selecting the dimension P of the light sensing pixels and the aperture number FN of the lens such that 2·P·FN≧X.
Dependencies are inferred from the claim text.