Femtoprojector optical systems, used in eye-mounted display
First Claim
Patent Images
1. An eye-mounted display comprising:
- a contact lens mountable on a user'"'"'s eye; and
one or more femtoprojectors in the contact lens, at least one of the femtoprojectors comprising;
an image source that produces an image; and
a femtoprojector optical system comprising;
a convex first mirror facing the image source, where image-forming rays from the image source are incident on and reflected by the first mirror and stray rays from the image source are not incident on the first mirror;
a concave second mirror having a center opening to accommodate the image source, the second mirror having a lateral dimension that is larger than the first mirror and also larger than the image source, the second mirror facing the first mirror and further reflecting the image-forming rays from the first mirror, the first mirror and the second mirror cooperating to project the image from the image source;
wherein the image source, the first mirror and the second mirror are axially aligned along a common axis, and a distance along the common axis from the image source to the second mirror is less than a distance from the second mirror to the first mirror; and
a light baffle system that includes an obscuration adjacent to and surrounding the first mirror, the obscuration blocking stray rays from the image source that are not reflected by the first mirror.
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Abstract
A variety of femtoprojector optical systems are described. Each of them can be made small enough to fit in a contact lens using plastic injection molding, diamond turning, photolithography and etching, or other techniques. Most, but not all, of the systems include a solid cylindrical transparent substrate with a curved primary mirror formed on one end and a secondary mirror formed on the other end. Any of the designs may use light blocking, light-redirecting, absorbing coatings or other types of baffle structures as needed to reduce stray light.
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Citations
19 Claims
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1. An eye-mounted display comprising:
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a contact lens mountable on a user'"'"'s eye; and one or more femtoprojectors in the contact lens, at least one of the femtoprojectors comprising; an image source that produces an image; and a femtoprojector optical system comprising; a convex first mirror facing the image source, where image-forming rays from the image source are incident on and reflected by the first mirror and stray rays from the image source are not incident on the first mirror; a concave second mirror having a center opening to accommodate the image source, the second mirror having a lateral dimension that is larger than the first mirror and also larger than the image source, the second mirror facing the first mirror and further reflecting the image-forming rays from the first mirror, the first mirror and the second mirror cooperating to project the image from the image source;
wherein the image source, the first mirror and the second mirror are axially aligned along a common axis, and a distance along the common axis from the image source to the second mirror is less than a distance from the second mirror to the first mirror; anda light baffle system that includes an obscuration adjacent to and surrounding the first mirror, the obscuration blocking stray rays from the image source that are not reflected by the first mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification