Angularly segmented hot mirror for eye tracking
AssigneeMagic Leap, Inc.
InventorDavid Cohen
Life of this patent
Estimating the term…
Abstract
Examples of an imaging system for use with a head mounted display (HMD) are disclosed. The imaging system can include a forward-facing imaging camera and a surface of a display of the HMD can include an off-axis diffractive optical element (DOE) or hot mirror configured to reflect light to the imaging camera. The DOE or hot mirror can be segmented, for example, with different segments having different angles or different optical power. The imaging system can be used for eye tracking, biometric identification, multiscopic reconstruction of the three-dimensional shape of the eye, etc. Methods for manufacturing angularly segmented optical elements are also provided. The methods can include injection molding.
Claims19
A method of manufacturing a segmented hot mirror, the method comprising:
- providing a first mold including a first portion and a second portion that form a first cavity, the first portion comprising a first surface and a second surface, wherein the first surface is adjacent to the second surface and forms a non-zero angle relative to the second surface, and wherein the non-zero angle is in a range from 2 degrees to 25 degrees, the second portion comprising a third surface that is opposite to the first surface of the first portion and substantially flat, wherein the third surface is substantially parallel to the first surface of the first portion;
- disposing a hot mirror film adjacent to at least the first surface and the second surface of the first portion of the first mold;
- injecting a first polymer material into the first cavity of the first mold to form a first molded component comprising a first component surface and a second component surface opposite the first component surface, wherein the first component surface is a segmented surface that includes a first segment and a second segment, wherein the first segment conforms to the first surface of the first portion and the second segment conforms to the second surface of the first such that the first segment forms the non-zero angle relative to the second segment, and wherein the second component surface conforms to the third surface of the second portion of the first mold such that the second component surface is substantially flat and substantially parallel to the first segment of the first component surface;
- removing the first molded component from the first mold, wherein at least a portion of the hot mirror film is disposed on the segmented surface of the first molded component and is removed from the first mold with the first molded component;
- disposing the first molded component, with at least the portion of the hot mirror film, in a second mold having a second cavity;
- injecting a second polymer material into the second cavity to form a second molded component, the second polymer material covering at least the portion of the hot mirror film;
- and
- removing the second molded component from the second mold to provide the segmented hot mirror that comprises:
- the first molded component, the second molded component, and at least the portion of the hot mirror film that is between the first molded component and the second molded component and that is disposed on the segmented surface of the first molded component.
Dependencies are inferred from the claim text.