Light leakage detection in edge sealants of optical devices
First Claim
1. An inspection apparatus for inspecting an eyepiece, the inspection apparatus comprising:
- a stage including a surface, an opening, and one or more mirror support structures that each supports a respective mirror;
a light source arranged to project light through the opening of the stage and into a portion of the eyepiece when the eyepiece is resting on the surface of the stage;
an enclosure that encloses the stage and the light source to isolate the eyepiece from external light from outside the enclosure; and
a camera that is arranged to capture, through an aperture in the enclosure, at least one image of an interior of the enclosure, the at least one image including at least a portion of the light that leaks through an edge sealant of the eyepiece and that is reflected to the camera by the at least one mirror.
3 Assignments
0 Petitions
Accused Products
Abstract
Techniques are described for inspecting optical devices, such as eyepieces, to determine whether they exhibit light leakage through an edge sealant that has been applied to the device. Embodiments provide an inspection apparatus that can be employed to detect the leakage of light through an edge sealant of an optical device, where the edge sealant is applied to prevent, or at least reduce, the leakage of light from the optical device. Light from a light source is projected into the optical device. The light can travel along one or more wave guides within the device, until reaching an edge of the device. Light that is able to leak through an edge sealant can be reflected, using mirror(s) in the apparatus, and detected by a camera. Image(s) captured by the camera can be analyzed to determine the performance of the optical device with respect to edge leakage.
6 Citations
20 Claims
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1. An inspection apparatus for inspecting an eyepiece, the inspection apparatus comprising:
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a stage including a surface, an opening, and one or more mirror support structures that each supports a respective mirror; a light source arranged to project light through the opening of the stage and into a portion of the eyepiece when the eyepiece is resting on the surface of the stage; an enclosure that encloses the stage and the light source to isolate the eyepiece from external light from outside the enclosure; and a camera that is arranged to capture, through an aperture in the enclosure, at least one image of an interior of the enclosure, the at least one image including at least a portion of the light that leaks through an edge sealant of the eyepiece and that is reflected to the camera by the at least one mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of inspecting an eyepiece, the method comprising:
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positioning an eyepiece on a stage defining an opening, wherein the eyepiece comprises an edge sealant along at least one edge of the eyepiece; enclosing the stage to isolate the eyepiece from external light outside the enclosure; providing light from a light source inside the enclosure through the opening and toward the eyepiece; capturing, through an aperture in the enclosure, an image of an interior of the enclosure; and assessing, based on the image, light leakage from the eyepiece through the edge sealant. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification