92 results about "Partially reflective surface" patented technology

An eyepiece includes a display module for providing display light, a concave end reflector, and a viewing region including a partially reflective surface to redirect at least a portion of the display light out of an eye-ward side of the eyepiece along an emission path. The partially reflective surface is obliquely angled with an offset from 45 degrees relative to the eye-ward side to cause the emission path to have a first oblique angle in a horizontal dimension relative to a first normal vector of the eye-ward side. The concave end reflector is tilted such that a second normal vector from a center point of the concave end reflector is obliquely angled relative to a top or bottom surface of the eyepiece to cause the emission path to have a second oblique angle in a vertical dimension relative to the first normal vector of the eye-ward side.

An eyepiece for a head mounted display includes a display module, end reflector, and viewing region. The end reflector is disposed at an opposite end of the eyepiece from the display module to reflect the display light back from a forward propagation path to a reverse propagation path. The viewing region is disposed between the display module and the end reflector and includes a partially reflective surface, that passes the display light traveling along the forward propagation path and redirects the display light traveling along the reverse propagation path out of an eye-ward side of the eyepiece along an emission path. The partially reflective surface has a compound folding angle such that the emission path of the display light emitted from the eyepiece is folded along two axes relative to the reverse propagation path between the end reflector and the partially reflective surface.

A dual viewpoint solid catadioptric lens has a first spherical refractive surface S1 having a center C1 located on an optical axis of the lens and having a radius r1, and a second spherical refractive surface S2 having a center C2 located on the optical axis of the lens and having a radius r2<r1. The lens also has a first ellipsoidal reflective surface E1 with foci F1 and F1′ on the optical axis of the lens, and a second ellipsoidal partially reflective surface E2 having foci F2 and F2′ on the optical axis of the lens. Focus F1 coincides with C1, focus F2 conincides with C2, and focus F1′ coincides with F2′. The points C1 and C2 provide dual viewpoints for the lens, which may be used in a variety of imaging applications.

A light bar proximity switch is provided that includes a light pipe having a first surface and a second surface, wherein the first and second surface define an area. The light bar proximity sensor further includes an at least partially reflective surface adjacent the second surface, at least one circuit board spaced from the light pipe and the at least partially reflective surface, at least one proximity sensor electrically connected to the at least one circuit board, and at least one light source configured to project light along the area, wherein the emitted light is reflected by the at least partially reflective surface and viewed through the first surface.

An improved band pass interferometer for use as a high resolution wavelength selection unit comprising, as main elements, an input optical port (optical fiber) together with a fiber optic collimator for generating a narrow incoming collimated beam, two plane-parallel highly reflective surfaces with low reflection losses, one being totally reflective, (i.e. very little intensity of the light beam incident thereon should pass through the reflective surface,) the other being partially reflective, (i.e., a portion of a reflected light beam, more specifically its intensity, incident thereon should pass through the partially reflective surface becoming an output beam,) which splits the incoming narrow incoming collimated beam into a finite number of output beams, an optical medium located between the reflective surfaces, and a beam focusing element which collects all the output beams and focuses them into an output optical port (optical fiber). There is also provided a refractive index adjuster, such as, e.g., an electro-optical element, that changes the refractive index of the optical medium between the reflective surfaces using, preferably, an electro-optical control voltage. There is further provided an adjustable spacer, such as, e.g., a piezo-electrical element, that changes the spacing between the reflective surfaces using, preferably, a piezo-electric control voltage. The coherent beam emerging from the input port is collimated and is sent to two parallel reflective surfaces, one totally reflective, the other partially reflective, generating in this way a finite number of output beams, which are collected and focused into a focused spot by a converging element, usually a lens system. At the recombination point, which is the entrance aperture into the output optical port, all the multiple beams generated by the two mirrors setup, interfere. The output beam resulting from the interference of those multiple output beams is available as the output beam of the device. The transmission function, which is the ratio between the intensity available at the output port versus the intensity at the input port, strongly depends on the phase shift introduced between the multiple output beams by the beam-splitting element, realized with the two mirrors. The tuning principle of the said interferometer is to select only one wavelength at its output by changing either the spacing between the mirrors using the Piezo-electric control voltage or the refractive index of the media between them using the electro-optical control voltage, which leads to a shifting of the transmission maximum into a broad wavelength range, keeping also very good insertion loss or transmission efficiency for the selected wavelength and a constant bandwidth in the whole working range.

Embodiments of the present invention provide an alignment system operable to align a laser associated with a laser vision correction system. One embodiment of the alignment system comprises a laser source, a beam steering device, a system controller, a partially reflective surface, focusing optics, and an optical detector. The laser source generates a laser beam that the beam steering device receives and redirects along either a surgical pathway or an alignment pathway. The system controller couples to the beam steering device and directs the beam steering device to choose which pathway to be utilized. Additionally, the system controller may control the pulse repetition rate, intensity, beam profile and alignment of the laser beam. The partially reflective surface, within the alignment pathway, partially reflects the laser beam towards alignment coordinates on the surface of the optical detector. Focusing optics, if needed, may further be utilized to focus the partially reflected laser beam on the surface of the optical detector. The optical detector senses the coordinates associated with the illuminated portion of the surface of the optical detector. The system controller compares the coordinates associated with the alignment coordinates and the sensed coordinates and generates a position offset which is used to align the laser beam / steering device.

An optical measurement and inspection method and apparatus having enhanced path length detection uses a Fabry-Perot cavity to increase the phase detection sensitivity for light reflected from optical structures within a device under inspection. A partially reflective surface is inserted between an illumination subsystem and the device under inspection and the position of the partially reflective surface may be adjusted by a positioner to create the Fabry-Perot cavity between one or more surfaces within the device under inspection. The detection of phase changes is improved, providing improved sensitivity to optical path differences produced by structures within the device under inspection.

A method and apparatus including in-resonator imaging lens for improving resolution of a resonator-enhanced optical system provides resolution improvements for optical inspection and measurement systems, optical storage and retrieval systems as well as other optical systems. An imaging lens is incorporated in the resonator to image a point or area of one of the reflective surfaces of the resonator on a point or area of another reflective surface of the resonator. Resonance may be supported between the two surfaces, or with respect to only one surface with the other surface acting as an intermediary reflector. The partially reflective surface or a totally reflective surface may also be incorporated on a planar outside surface of the imaging lens.

A new and useful attenuating device and method for attenuating a polarized laser beam is provided. At least one attenuating optic is located along, and is rotatable about, a polarized laser beam axis, and is configured to transmit and to reflect portions of the polarized laser beam. The attenuating optic provides predetermined attenuation of the polarized laser beam by changing the ratio between transmission and reflection of the polarized laser beam as a function of the incidence of the polarized laser beam on one or more partially reflective surfaces of the attenuating optic. The attenuating optic is rotatable about the polarized laser beam axis to control the incidence of the polarized laser beam on the one or more partially reflective surfaces of the attenuating optic, thereby to control the ratio between transmission and reflection of the polarized laser beam and provide a range of attenuation of the polarized laser beam.

The invention discloses a stereoscopic imaging apparatus. The stereoscopic imaging apparatus includes: an objective optical system acquiring light rays emitted from a subject and guiding the light rays to a downstream component; a separation optical system having a partially reflective surface reflecting part of the light rays and transmitting part thereof; first image forming optical system disposed on a path along which the light rays reflected off the separation optical system travel and focusing the reflected light rays to form a parallax image; second image forming optical system disposed on a path along which the light rays passing through the separation optical system travel and focusing the transmitted light rays to form a parallax image; a first imaging device converting the parallax image formed by the first image forming optical system into an image signal; and a second imaging device converting the parallax image formed by the second image forming optical system into an image signal.

An optical inspection method and apparatus having an enhanced height sensitivity region and roughness filtering uses a Fabry-Perot cavity to increase the phase detection sensitivity for light reflected from surface defects having a height above a predetermined level. A partially reflective surface is inserted between an illumination subsystem and a surface under inspection. The position of the partially reflective surface with respect to the surface under inspection is adjusted to provide both filtering of defects below the predetermined level and enhance sensitivity for a region of defect heights above the predetermined level. The angular resolution of the inspection system is improved, providing far-field inspection that can detect small-profile defects having unacceptable heights. Media storage, semiconductor wafer and other precision surface manufacture may be improved by use of the techniques of the present invention.

An eyepiece includes a display module for providing display light, a concave end reflector, and a viewing region including a partially reflective surface to redirect at least a portion of the display light out of an eye-ward side of the eyepiece along an emission path. The partially reflective surface is obliquely angled with an offset from 45 degrees relative to the eye-ward side to cause the emission path to have a first oblique angle in a horizontal dimension relative to a first normal vector of the eye-ward side. The concave end reflector is tilted such that a second normal vector from a center point of the concave end reflector is obliquely angled relative to a top or bottom surface of the eyepiece to cause the emission path to have a second oblique angle in a vertical dimension relative to the first normal vector of the eye-ward side.