Waveguide with 2-layer stack-up
AssigneeSnap Inc.
InventorsDavid Fliszar, Amit Singh
Life of this patent
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Abstract
A lightweight stacked optical waveguide using two plastic substrates having nano-structure gratings and a single glass substrate sandwiched between them. The nano-structure gratings face each other, and are each encapsulated within the optical waveguide. The two plastic substrates are each adhesively secured to the central glass substrate rather than to each other to provide sufficient securing strength and precisely establish and maintain an air gap between the substrates. The thickness of the plastic substrates and the glass substrate are selected such that the stacked optical waveguide is lightweight, but also has sufficient drop performance. The stacked optical waveguide can be efficiently manufactured as the adhesive bonds a plastic substrate to a glass substrate.
Claims18
A stacked optical waveguide, comprising:
- a glass substrate;
- a first plastic substrate having a first optical structure, the first plastic substrate secured to and spaced from the glass substrate;
- a second plastic substrate having a second optical structure, the second plastic substrate secured to and spaced from the glass substrate such that the glass substrate is interposed between the plastic substrates;
- a first air gap disposed between the first plastic substrate and the glass substrate;
- and
- a second air gap disposed between the second plastic substrate and the glass substrate, wherein the first and second optical structures are encompassed by the respective air gap, and wherein the first and second optical structures face one another.
A method of processing a stacked optical waveguide, comprising:
- securing a first plastic substrate to a glass substrate, the first plastic substrate having a first optical structure, the first plastic substrate spaced from the glass substrate;
- and
- securing a second plastic substrate to the glass substrate, the second plastic substrate having a second optical structure, the second plastic substrate spaced from the glass substrate such that the glass substrate is interposed between the plastic substrates, wherein a first air gap is disposed between the first plastic substrate and the glass substrate, a second air gap is disposed between the second plastic substrate and the glass substrate, wherein the first and second optical structures are encompassed by the respective air gap, and wherein the first and second optical structures face one another.
Dependencies are inferred from the claim text.