224 results about "Dichroic filter" patented technology

A light source apparatus includes: an excitation light source including a laser light source; a first wheel that is controlled to rotate, and includes, in a part of a surface thereof to be illuminated by excitation light emitted from the excitation light source, a phosphor layer to be excited by the excitation light; a dichroic mirror that guides fluorescence emitted from the phosphor layer of the first wheel and the excitation light to an illumination optical system; and a second wheel that is controlled to rotate, and includes a dichroic filter that transmits light having a desired wavelength component of each of the fluorescence and the excitation light output from the dichroic mirror.

Light from an object such as a cell moving through an imaging system is collected and dispersed so that it is imaged onto a plurality of separate detectors. The light is spectrally dispersed by a plurality of spaced-apart dichroic reflectors, each detector receiving light from a different one of the dichroic reflectors. Each dichroic filter reflects light of a different predefined color, passing light of other colors. The output signal from each detector is indicative of a different characteristic of the object. In one configuration, each detector is provided with a separate imaging lens. In another configuration, the detectors are spaced at varying distances from the corresponding dichroic reflectors, so that separate imaging lenses are not required.

Light from an object such as a cell moving through an imaging system is collected and dispersed so that it is imaged onto a plurality of separate detectors. The light is spectrally dispersed by a plurality of spaced-apart dichroic reflectors, each detector receiving light from a different one of the dichroic reflectors. Each dichroic filter reflects light of a different predefined color, passing light of other colors. The output signal from each detector is indicative of a different characteristic of the object. In one configuration, each detector is provided with a separate imaging lens. In another configuration, the detectors are spaced at varying distances from the corresponding dichroic reflectors, so that separate imaging lenses are not required.

A plurality of light sources, each radiating a color of light; a corresponding plurality of reflectors are arranged and configured so that the reflector reflects light from a predetermined one of the plurality of light sources. The reflected light from the plurality of reflectors is mixed to generate a composite light from the plurality of light sources. A sequenced or stacked array of the light sources and dichroic reflectors mixes the reflected light from the reflectors. Each reflector is positioned on a common optical axis with an aligned corresponding one of the plurality of light sources to provide a light source and reflector pair. Each reflector is coated with a dichroic filter material which reflects the color of light radiated by the corresponding light source of the pair, and which transmits light radiated by all preceding light sources in the sequenced array.

A plurality of dichroic filters are included in multifunction photovoltaic cells to increase efficiency. For example, in a multi-junction photovoltaic cell comprising blue, green, and red active layers, blue, green, and red dichroic filters that reflect blue, green, and red light, respectively, may be disposed proximal to the blue, green, and red active layers to reflect back light not absorbed on the first past. The dichroic filters may be used to demultiplex white light incident on the PV cell and deliver suitable wavelengths to the appropriate active layer, e.g., blue wavelengths to the blue active layer, green wavelengths to the green active layer, red wavelengths to the red active layer. The PV cell may additionally be interferometrically tuned to increase absorption efficiency. Accordingly, optical resonant layers and cavities may be employed in certain embodiments.

A white beam with high color-rendering index is formed by uniting a collimated red beam and a collimated blue−green beam, the latter having as its source a blue LED with a green phosphor. The white beam is formed by a prism with an amber low-pass dichroic filter. The prism cross-section can be either a square or an equilateral triangle. The triangular prism can have one third of its mass reduced by stepped facets. Both types of prism can be elongated to accommodate multiple collimators. Switching between white, red, and blue−green allows application to police vehicles.

Provided are photochromic articles including a substrate, a primer layer that includes a first photochromic compound, and a photochromic-dichroic layer over the primer layer that includes a photochromic-dichroic compound. The first photochromic compound and the photochromic-dichroic compound each are selected such that the photochromic-dichroic compound has an unactivated state terminal minimum absorbance wavelength that is less than or equal to the unactivated state terminal minimum absorbance of the underlying first photochromic compound. The present invention also relates to such photochromic articles that further include a topcoat layer over the photochromic-dichroic layer, the topcoat layer including a second photochromic compound that has an unactivated state terminal minimum absorbance wavelength that is less than the unactivated state terminal minimum absorbance wavelength of the underlying photochromic-dichroic compound.

A plurality of light sources, each radiating a color of light; a corresponding plurality of reflectors are arranged and configured so that the reflector reflects light from a predetermined one of the plurality of light sources. The reflected light from the plurality of reflectors is mixed to generate a composite light from the plurality of light sources. A sequenced or stacked array of the light sources and dichroic reflectors mixes the reflected light from the reflectors. Each reflector is positioned on a common optical axis with an aligned corresponding one of the plurality of light sources to provide a light source and reflector pair. Each reflector is coated with a dichroic filter material which reflects the color of light radiated by the corresponding light source of the pair, and which transmits light radiated by all preceding light sources in the sequenced array.

A fluorescent type of green light source of a semiconductor in a light source apparatus for an endoscope includes a blue excitation light source device and green emitting phosphor. The blue excitation light source device emits blue excitation light. The green emitting phosphor is excited by the blue excitation light, and emits green fluorescence. A dichroic filter in a dichroic mirror cuts off the blue excitation light from an emission spectrum of mixed light of the blue excitation light and green fluorescence from the fluorescent type of green light source. Thus, illumination light with the emission spectrum of a target can be stably supplied without influence of the blue excitation light to a light amount of blue light from a blue light source of a semiconductor.

The illumination device includes a plurality of light source units and a plurality of optical concentrators facing the plurality of light source units and each having an entry surface, lateral surfaces, and an output surface. A color synthesizing unit synthesizes light emitted by the plurality of optical concentrators and includes two intersecting dichroic filters. A relay optical system transmits light synthesized by the color synthesizing unit to an illuminated surface.

To provide a dielectric multilayer filter, such as an IR cut filter and a red-reflective dichroic filter, that produces an effect of reducing incident-angle dependency and has a wide reflection band. A first dielectric multilayer film 30 is formed on the front surface of a transparent substrate 28, and a second dielectric multilayer film 32 is formed on the back surface of the transparent substrate 28. The width W1 of the reflection band of the first dielectric multilayer film 30 is set narrower than the width W2 of the reflection band of the second dielectric multilayer film 32. The half-value wavelength E2L of the shorter-wavelength-side edge of the reflection band of the second dielectric multilayer film 32 is set between the half-value wavelength E1L at the shorter-wavelength-side edge and the half-value wavelength E1H at the longer-wavelength-side edge of the reflection band of the first dielectric multilayer film 30.

To provide a backlight device with which a color hue and a color purity of a display panel can be improved while suppressing the lowering of the brightness of the display panel. A backlight device (20) comprises a pseudo white LED (21), a light guide plate (22), and a dichroic filter (25) which reflects a light with a predetermined wavelength among the light emitted from the pseudo white LED at a predetermined ratio. The dichroic filter is configured so that the light reflectance changes when the incident angle of the light is changed and a tilt angle to a light emitting surface (21e) of the pseudo white LED can be adjusted.

A dichroic laser texturing and regulating device for laser texturing process comprised a continuous laser generator, an expanding telescope, a dichroic turntable, a light beam conversion and combination mirror, a focusing mirror and a roller. The expanding telescope is positioned between the continuous laser generator and the focusing mirror, the dichroic turntable and the light beam conversion and combination mirror is disposed between the expanding telescopes, the dichroic turntable is inserted between the light beam conversion and combination mirror, and the focusing mirror is located above the roller. The continuous laser beam given off by the continuous laser generator becomes pulse light after splitted by the revolving dichroic turntable, the light beam conversion and combination mirror implements light path shift and conversion of light beam reflected and splitted by the dichroic turntable, finally the pulse laser beam is focused to the roller by the focusing mirror after being expanded by the expanding telescope. Accordingly, the texturing roller surface processed by the laser regulating device of the invention has isotropy and even roughness, and higher wearability.

A light source apparatus includes: an excitation light source including a laser light source; a first wheel that is controlled to rotate, and includes, in a part of a surface thereof to be illuminated by excitation light emitted from the excitation light source, a phosphor layer to be excited by the excitation light; a dichroic mirror that guides fluorescence emitted from the phosphor layer of the first wheel and the excitation light to an illumination optical system; and a second wheel that is controlled to rotate, and includes a dichroic filter that transmits light having a desired wavelength component of each of the fluorescence and the excitation light output from the dichroic mirror.

A first multilayer film filter 2 is formed on one side of a transparent substrate 1, e.g., glass, and a second multilayer film filter 3 is formed on the other side. The multilayer film filter 2 is a low pass filter, and the multilayer film filter 3 is a high pass filter. Furthermore, the multilayer films are designed so that a shift in spectral transmittance characteristics produced by changes in incident angle is larger for the multilayer film filter 2 than for the multilayer film filter 3. Thereby, even if light of a wavelength that should be blocked is transmitted due to the shift in the spectral transmittance characteristics of the multilayer film filter 2, the transmittance of light of that wavelength is blocked because of the shift in the spectral transmittance characteristics of the multilayer film filter 3. Thereby, the dichroic filter transmits a significantly reduced percentage of stray light that impinges at large incident angles.

For combining light from different light sources in a light source, dichroic filters are displaced individually according to the physical arrangement of the light sources such that the reflected light from the dichroic filters is coincident in angle and space.

An optical thin film stack provides reflection of essentially all light except for a selected amount of transmission over a selected wavelength range. Reflecting, rather than absorbing, unwanted light avoids heating caused by light absorption and allows productive use of the non-transmitted light in some applications. In some embodiments, reflector designs are “stacked” on an optical substrate to provide serial optical reflectors. Stacking dichroic filters provides reduced sensitivity to cone angle and manufacturing advantages.

Apparatuses and methods for limiting the angle of incidence (AOI) of light reaching a dichroic filter. The apparatus may include an AOI filter element and the dichroic filter. The apparatus may be a sensor and may include a photodetector. The dichroic filter may be configured to prevent light having a wavelength outside a band pass region from reaching the photodetector and to pass light having a wavelength within the band pass. Physical limitations of the dichroic filter may preclude the dichroic filter from preventing high AOI light having a wavelength outside a band pass region from reaching the photodetector. The AOI filter element may be configured to prevent light having a high AOI from reaching the dichroic band pass filter and to propagate light having a low AOI to the dichroic band pass filter. The AOI filter element may be a fiber optic bundle comprising a plurality of optical fibers.

A light emitting device includes a light emitting element, an optical concentrator, such as a compound parabolic concentrator, a dichroic filter between the light emitting element and the optical concentrator and a wavelength converting material, such as a phosphor. The optical concentrator receives light from the light emitting element, via the dichroic filter, and emits the light from an exit surface, which is smaller than the entrance surface. The optical concentrator may be manufactured from a material with a high refractive index, such as sapphire. The wavelength converting material is, e.g., disposed over the exit surface. The radiance of the wavelength converting material is increased by pumping the wavelength converting material through a high index of refraction material and outputting the converted light into a low refractive index medium, such as air.

A light source apparatus includes: an excitation light source including a laser light source; a first wheel that is controlled to rotate, and includes. in a part of a surface thereof to be illuminated by excitation light emitted from the excitation light source, a phosphor layer to be excited by the excitation light; and a second wheel that is controlled to rotate, and includes a dichroic filter that outputs light having a desired wavelength component of each of fluorescence emitted from the phosphor layer of the first wheel and the excitation light emitted from the excitation light source.

An imaging light guide has a waveguide formed as a coated substrate having first and second surface coatings. A first in-coupling diffractive optic on the first coating directs diffracted light of a first wavelength range into the waveguide along a first direction. A second in-coupling diffractive optic on the second coating directs diffracted light of a second wavelength range into the waveguide along a second different direction. A first dichroic patch between the first surface of the substrate and the first surface coating for (a) transmitting the first wavelength range, (b) transmitting the second wavelength range through a range of incidence angles, and (c) reflecting the second wavelength range through a higher range of incidence angles. A second dichroic patch between the second surface of the substrate and the second surface coating for transmitting the second wavelength range and reflecting the first wavelength range.

An LED light apparatus and methodology that can produce a collinear beam of light. The apparatus has a housing with three sets of LED light assemblies each having several LED lights of the same color, being red, blue or green. A dichroic bandpass filter and a dichroic notch filter are incorporated along with a power supply. In one embodiment both filters intersect forming an x-pattern. Red light passes through both filters. The resulting light from the bandpass filter combines with blue light and passes through the notch filter. This combined light stream then combines with green light to form a collinear beam of white or colored light. The resulting light from the red light passing through the notch filter combines with green light and passes through the bandpass filter. This combined light stream then combines with the blue light to form a collinear beam of white or colored light.

A sequential color display system using a white light source to create a full color image projected onto an image plane. A dynamic filter, typically a series of moving dichroic filters, generates a series of primary colored light beams that are swept across the surface of a spatial light modulator. Typically all three primary colors are produced simultaneously by the dynamic filter. The illuminated portion of the dynamic filter is imaged onto the modulator and controller provides appropriate image data for each portion of the modulator in synchronization with the sweep of the primary color bands across the modulator surface. The primary color bands are modulated by the spatial light modulator and the modulated light is focused by lens onto the image plane. The viewer integrates the light arriving at each portion of the image plane over a frame period to provide the perception of a full-color image.

Provided are photochromic articles that include a substrate, a primer layer that includes a first photochromic compound, and a photochromic-dichroic layer over the primer layer that includes a photochromic-dichroic compound. The first photochromic compound and the photochromic-dichroic compound each are selected such that the photochromic-dichroic compound has an absorbance of less than or equal to 0.1 at the wavelength of peak absorbance of the underlying first photochromic compound. The present invention also relates to such photochromic articles that further include a topcoat layer over the photochromic-dichroic layer. The topcoat layer can include a second photochromic compound that has an absorbance of less than 0.1 at the wavelength of peak absorbance of the underlying photochromic-dichroic compound. The photochromic articles provide, for example, a combination of linear polarizing properties, and reduced percent transmittance when in a colored or darkened state, such as when exposed to actinic light.