Systems, devices, and methods for focusing laser projectors
First Claim
1. A wearable heads-up display comprising:
- a support structure that in use is worn on a head of a user;
a holographic combiner carried by the support structure, wherein the holographic combiner is positioned within a field of view of an eye of the user when the support structure is worn on the head of the user; and
a laser projector carried by the support structure and positioned and oriented to direct laser light towards the holographic combiner, wherein the laser projector comprises;
at least one laser diode to provide laser light;
at least one collimation lens positioned in an optical path of the laser light, the at least one collimation lens to receive the laser light and at least reduce a divergence of the laser light;
a convergence lens positioned downstream from the at least one collimation lens in the optical path of the laser light, the convergence lens to receive the laser light having at least reduced divergence from the at least one collimation lens and converge the laser light to a focus in between the laser projector and the holographic combiner; and
at least one scan mirror positioned in the optical path of the laser light in between the convergence lens and the focus of the laser light, wherein a spot size of the laser light at the at least one scan mirror is greater than a spot size of the laser light at the focus of the laser light.
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Accused Products
Abstract
Systems, devices, and methods for focusing laser projectors are described. A laser projector includes N≥1 laser diodes, each of which emits laser light having a divergence. Each laser diode is paired with a respective primary or collimation lens to at least reduce a divergence of the laser light that the laser diode produces. Downstream from the primary lens(es) in the optical path(s) of the laser light, a single dedicated secondary or convergence lens converges the laser light to a focus. By initiating the convergence of the laser light at the secondary or convergence lens as opposed to at the primary or collimation lens(es), numerous benefits that are particularly advantageous in laser projection-based wearable heads-up displays are realized.
136 Citations
9 Claims
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1. A wearable heads-up display comprising:
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a support structure that in use is worn on a head of a user; a holographic combiner carried by the support structure, wherein the holographic combiner is positioned within a field of view of an eye of the user when the support structure is worn on the head of the user; and a laser projector carried by the support structure and positioned and oriented to direct laser light towards the holographic combiner, wherein the laser projector comprises; at least one laser diode to provide laser light; at least one collimation lens positioned in an optical path of the laser light, the at least one collimation lens to receive the laser light and at least reduce a divergence of the laser light; a convergence lens positioned downstream from the at least one collimation lens in the optical path of the laser light, the convergence lens to receive the laser light having at least reduced divergence from the at least one collimation lens and converge the laser light to a focus in between the laser projector and the holographic combiner; and at least one scan mirror positioned in the optical path of the laser light in between the convergence lens and the focus of the laser light, wherein a spot size of the laser light at the at least one scan mirror is greater than a spot size of the laser light at the focus of the laser light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification