Abstract: An operating room light fixture with a light fixture housing, in which at least one lighting unit with at least one light source is arranged, with a handle, which is arranged on a side of the light fixture housing facing the operating area, wherein the handle comprises a control element for setting and/or adjusting the luminous intensity of the light source.

Abstract: A new lighting system is provided that is particularly useful in projecting light to a deck where pilots use night vision goggles (NVGs). The system comprises a pair of subsystems that project light with different, complementary spatial distributions. One subsystem projects light with one spatial distribution, and the other lighting subsystem projects light with another spatial distribution that supplements the light from the first subsystem, so as to provide a system that effectively illuminates an entire target. The system is designed to substantially filter light so that the light does not interfere with NVGs. The system includes new optical projection structure that minimizes the overall size of the projection structure, and maintains good efficiency.

Abstract: Crime scene lighting devices are used in forensic criminology for illumination and investigation at crime scenes using fluorescence excitation. High radiation powers are required both for white light in the so-called general search and for the criminologically relevant UVA-blue-green range. Moreover, it should be possible for the crime scene investigator to use the forensic lighting device portably and independent from the public power supply. The present disclosure relates to a suitable crime scene light device with a mercury ultra high pressure lamp as the light source, a light guide and terminals for operating the lamp selectively with an accumulator or the public power supply system. A suitable carrier bag, a so-called lorgnette with various longpass filters and a cross-section converter for visualizing shoeprints form useful accessories of the forensic lighting device.

Abstract: Disclosed is an intense pulse light device, in which plural divided light filters coated with individually different materials are rotatably and uniformly aligned around a reflection mirror in order to selectively filter lights according to wavelengths thereof, so that it is not necessary to exchange a handle body or filters, thereby improving convenience of use for the IPL device, and in which the loose contact of power lines and signal lines, leakage of cooling water, and penetration of impurities can be prevented, thereby improving reliability of IPL device. A semicircular reflection mirror aligned around a flash lamp installed in a body and a light filter section is aligned around the reflection mirror while forming a predetermined space therebetween. The light filter section is uniformly divided into two or four light filters so as to increase selectivity for the light radiated from flash lamp.

Abstract: There is provided a lighting apparatus using a filter and a condenser for LED illumination in which an optical filter to obtain diverse optical patterns as a user desires is connected to a condenser for LED illumination without using any additional device. The lighting apparatus in which the optical filter can be exchanged comprises: a LED for generating a light source for illumination, a condenser for concentrating the light source generated from the LED, and an optical filter connected to the condenser, for providing an optical pattern, wherein the optical filter is connected to the condenser so as to be attachable to or detachable from the condenser.

Abstract: A light exposure system is used to expose an alignment layer formed of anistropically absorbing molecules so as to allow alignment of subsequently applied liquid crystal polymer (LCP) molecules. The light incident on the alignment layer is polarized. When a single polarizer is used, the azimuthal polarization direction varies across the substrate carrying the alignment layer. Various approaches to reducing the azimuthal polarization variation may be adopted, including the introduction of various types of polarization rotation reduction element and in selecting an appropriate tilt angle for the light source. Furthermore, a reflective structure may be inserted between the light source and the alignment layer. Use of the reflective structure increases the total amount of light incident on the alignment layer.

Abstract: A wavelength conversion element includes a second harmonic wave generating element provided with an entrance surface and an emission surface, a function of converting an incident fundamental wave into a second harmonic wave with a different wavelength and emitting the second harmonic wave, and a cyclic polarization inversion structure configured so as to be able to match a phase of the second harmonic wave in a pseudo manner, and a first wavelength dispersive optical element disposed on the entrance surface side of the second harmonic wave generating element, having a first diffraction surface for diffracting an incident light beam with a diffraction angle increasing in accordance with a wavelength of an incident light beam to disperse the incident light beam by the wavelength of the incident light beam, and for emitting the light beam dispersed in the first diffraction surface towards the second harmonic wave generating element.

Abstract: The object of this invention is an illumination source that reduces, to a variable extent, the emission of short wavelengths of light to protect healthy and/or pseudophakic eyes (subjected to cataract surgery) and/or eyes suffering neurodegeneration from the short wavelengths of the visible spectrum from 500 to 380 nm. The light source can be incandescent, halogen, fluorescent or any other source. The invention avoids the difficulties and risks of existing ways of protecting healthy eyes or eyes subjected to cataract surgery, and improves the protection of eyes suffering neurodegeneration, simply by reducing the short wavelengths of the visible spectrum emitted by a light source. The invention consists of an ordinary light source whose emission of a variable proportion of short wavelengths of the visible spectrum from 500 to 380 nm is reduced.

Abstract: A device is provided for the treatment and prophylaxis of healthy eyes, pseudoaphakic eyes and/or eyes suffering macular and retinal degeneration that comprises a yellow filter applied to a conventional illumination system to protect them from short wavelengths of the visible spectrum under 500 nm and preferably in the range of 350 nm to 500 nm. This device the difficulties and risks of existing ways of protecting eyes undergoing cataract surgery and prevents or improves the degeneration of healthy eyes and those suffering neurodegeneration by the simple application of a protective filter to any lighting system. Embodiments of the invention comprise combining a conventional light source with a conventional yellow filter that absorbs wavelengths of light shorter than 500 nm so that the filter completely covers the illumination source.

Abstract: A power supply unit capable of varying power supplied to a light source at timings determined by synchronization signals is provided. The power supply unit comprises an interface that receives a plurality of types of synchronization signals with different pulse widths and a control unit that changes a setting of output power supplied by the power supply unit in accordance with the pulse widths of the plurality of types of synchronization signals. The control unit includes obtaining a standard time interval from a cycle of a standard type of synchronization signal that has a longest pulse width, parsing for determining type of each synchronization signal, redefining supply power values corresponding to respective types of synchronization signals, and changing the setting of output power of the power supply unit to a supply power value corresponding to a type of the synchronization signal.

Abstract: A structure of the Christmas light including a tubular socket having a pair of narrow notchs in opposing peripheries of the bottom abutting two pair of rectangular clamps on the bottom opposite to the narrow hole to define a pair of narrow gaps therebetween, a lamp inserted into the top of the socket having a base, a bulb, a pair of lead-in wires an isolation isle in the bottom of the base around the bulb and a pair of retaining holes in opposing peripheries of the base, a transparent outer cap having a reduced lower end inserted into the base and a pair of wedge retaining blocks on opposing peripheries of the reduced lower end engaged with the retaining holes of the base, a pair of electric wires each having a contact plate at inner end inserted into the socket and engaged with the lead-in wires. The electric wires are bent for 90 degrees and gripped by the narrow notchs and the rectangular clamps and went to opposing directions.

Abstract: A semiconductor structure includes a light emitting region disposed between an n-type region and a p-type region. A wavelength converting material configured to absorb a portion of the first light emitted by the light emitting region and emit second light is disposed in a path of the first light. A filter is disposed in a path of the first and second light. In some embodiments, the filter absorbs or reflects a fraction of first light at an intensity greater than a predetermined intensity. In some embodiments, the filter absorbs or reflects a portion of the second light. In some embodiments, a quantity of filter material is disposed in the path of the first and second light, then the CCT of the first and second light passing through the filter is detected. Filter material may be removed to correct the detected CCT to a predetermined CCT.

Abstract: Embodiments of the present invention provide a system and method for filtering light. More particularly, embodiments of the present invention may filter light provided as a source of illumination by using one or more mirrors in an optical path. In a specific embodiment, one or more cold mirrors in the optical path are coated such that they are operable to reflect light in the desired wavelengths while transmitting other wavelengths of light. Thus, as light from a light source is reflected off these cold mirrors undesired wavelengths of light may be substantially removed from the light before it is utilized to illuminate an area. In other embodiments, one or more hot mirrors mirror may also be provided in the optical path, where these hot mirrors are coated such that they are operable to transmit the desired wavelengths of light and reflect undesired wavelengths.

Abstract: An operating room light fixture having a first lighting unit including a first light source and an external reflector, a second lighting unit including a second light source and an internal reflector, and a control unit. The second lighting unit is positioned in front of the first lighting unit with respect to the direction in which the light emerges from the light fixture. The control unit may be actuated by a rotary element located in a handle of the light fixture. A heat reflection filter may be provided for adjusting the color temperature of the light fixture to a desired value.

Abstract: An optical manifold for efficiently combining a plurality of blue LED outputs to illuminate a phosphor for a single, substantially homogeneous output, in a small, cost-effective package. Embodiments are disclosed that use a single or multiple LEDs and a remote phosphor, and an intermediate wavelength-selective filter arranged so that backscattered photoluminescence is recycled to boost the luminance and flux of the output aperture. A further aperture mask is used to boost phosphor luminance with only modest loss of luminosity. Alternative non-recycling embodiments provide blue and yellow light in collimated beams, either separately or combined into white.

Abstract: A color wheel includes a plurality of color filter segments disposed so as to form a disk configuration, and a support member to fixedly set the plurality of color filter segments in place. Each of the color filter segments has a circular outer circumference, an inner circumference measuring shorter than the outer circumference, and two sides each connecting between the outer circumference and the inner circumference. In the color wheel described above, a chamfer is provided at the innermost portion of at least one of the two sides. The chamfer provides a clearance between opposing sides of any two adjacent color filter segments, so as to house burrs that are often formed at the sides, and therefore the opposing sides are fitted closely to each other even when burrs are formed at the sides. Consequently, spokes generated between two adjacent color filter segments can be minimized.

Abstract: An illumination source includes at least one light emitting diode, e.g., in array of LEDs that produce short wavelength light. One or more wavelength converting elements, such as phosphor elements, convert at least a portion of the short wavelength light from the LED(s) to longer wavelengths, such as Red and Green. A dichroic element positioned between the LED(s) and the wavelength converting element(s) transmits the light from the LED(s) and reflects the longer wavelengths from the wavelength converting element(s). A color selection panel selects the colors of light to be produced by the illumination device and to be recycled for another opportunity to be converted by the wavelength converting element(s) or to be reflected by the dichroic element. The color selection panel may operate in one or both of the spatial domain and the temporal domain.

Abstract: An absorptive layer is added to an image display system. The absorptive layer is selected to compensate for tint in a black state of a displayed image. In a Liquid Crystal On Silicon (LCOS) based light engine, blue wavelengths may cause a predominate tint in black portions of an image (or an entirely black image is tinted blue), and the absorptive layer is calculated to absorb an amount of blue equivalent to the tint. The absorptive layer is, for example, an unbalanced magenta dichroic, or a yellow filter. The yellow filter may be placed at any point in the light chain, including input/output of a kernel, input/output of a projection lens, or portions of a light engine or display screen. An unbalanced magenta may be constructed by adding a yellow filter to an existing magenta dichroic in the kernel design.

Abstract: A lighting device, comprising a solid state light emitter and a light filter. At least a portion of light emitted by the light emitter contacts the filter, and at least part of the light passes through the filter. Also, such lighting devices further comprising lumiphor, in which at least some of the first part of the light is absorbed by the lumiphor, which then emits light, and at least a portion of any light emitted by the lumiphor directed toward the filter is reflected by the filter. Also, a method of lighting, comprising illuminating a solid state light emitter in such devices. Also, a lighting device, comprising a solid state light emitter; a lumiphor and filter means for allowing at least a portion of light emitted by the light emitter to pass through and for reflecting a second portion of light emitted by the lumiphor after the lumiphor is excited.

Abstract: An optical manifold for efficiently combining a plurality of blue LED outputs to illuminate a phosphor for a single, substantially homogeneous output, in a small, cost-effective package. Embodiments are disclosed that use a single or multiple LEDs and a remote phosphor, and an intermediate wavelength-selective filter arranged so that backscattered photoluminescence is recycled to boost the luminance and flux of the output aperture. A further aperture mask is used to boost phosphor luminance with only modest loss of luminosity. Alternative non-recycling embodiments provide blue and yellow light in collimated beams, either separately or combined into white.

Abstract: An illumination device includes a light source, such as one or more light emitting diodes in an array, that produces light having a first wavelength range. A separated wavelength converting element is mounted to receive the light emitted by the light source. The wavelength converting element is physically separated from the light source along the beam path. The wavelength converting element converts the light having a first wavelength range into light having a second wavelength range. In one embodiment, a color separation element is directly coupled to the wavelength converting element. The color separation element is also physically separated from the light source. In another embodiment, the wavelength converting element is held by a heat sink by the sides.

Abstract: An LED illumination system comprising an LED light source (3) which emits light (8) in a main direction (9) and a first optical element (1), a second optical element (2) is arranged downstream of the first optical element (1) in the main direction (9), and the second optical element (2) has on a light entrance surface (6) which faces the LED light source (3) a surface structure (4) that comprises a plurality of pillow-shaped prominences (5).

Abstract: A key module with a multi-layer light guiding structure includes a plurality of keys, light guiding structure and a plurality of light blocks corresponding to the light guiding structure. The light guiding structure includes a plurality of light guiding plates. Each of the light guiding plate includes at least one light guiding strip corresponding to specific keys, which are staggered to each other or corresponding to each other. The light guiding strip is provided with a color layer. An electronic device using the key module individually or selectively lights light emitting elements for each layer of the light guiding plates. Therefore, different lights are emitted from the light guiding strips or a mixed light is produced from the light guiding strips to illuminate the keys. The keys have lights of different color to manifest symbols or alphabets on the keys.

Abstract: A projector comprises a light source, an Ultraviolet/Infrared Radiation (UV/IR) filter, a color wheel and means for guiding the light beam reflected by the color wheel toward directions away from the light source. The light source is for providing a light beam. The UV/IR filter is disposed with a tilt angle ranging from 13 degrees to 30 degrees. The color wheel for receiving the light beam transmits a primary color light beam of the light beam in a predetermined time section, and the other color light beam of the light beam is reflected by the color wheel. The means for guiding the light beam reflected by the color wheel toward directions away from the light source further guide a invisible light beam of the light beam reflected from the UV/IR filter.

Abstract: For lighting equipment for illumination of theatre and show stages and platforms there is designed an equipment for change of rotary gobos comprising a carrier disc supporting interchangeable segments with the gobos. The individual segments (2) are attached at the carrier disc (1) by central holding means, each segment (2) being provided with means for setting the segment (2) on the carrier disc (1). Each segment (2) is provided with a lamella (3) for attachment in the central holding mean holding means comprise a system of flexible fingers (10) in a fan-shaped arrangement, the fingers (10) being at inside ends fixed to the carrier disc (1) and on the outside free ends adapted to allow for insertion of the segment lamellas (3) between the fingers (10) and the carrier disc (1).

Abstract: A light fixture includes a flexible color filter material coupled to a scrolling mechanism that moves the material in a first direction to position a selected portion of the color filter material in a part of a light beam from the fixture. A device coupled to the mechanism may move the mechanism in a second direction so that another part of the light beam passes unfiltered. Different areas of the color filter material produce different colors. The device may move the mechanism in a direction parallel to a plane of the color filter material. The device may rotate the scrolling mechanism about an axis of rotation substantially parallel to the plane of the color filter material. The color filter material may include a dichroic filter. The light fixture may also include a second scrolling mechanism coupled to flexible diffusion material, such that at least a part of the light beam of the light fixture may be diffused by a predetermined amount.

Abstract: A light emitting device includes a light-generating unit for generating a primary light in a first wavelength range, a wavelength-converting member connected to the light-generating unit for converting a portion of the primary light into a secondary light in a second wavelength range, and an omnidirectional reflector connected to the wavelength-converting member for receiving the secondary light and the remainder of the primary light which was not converted by the wavelength-converting member. The omnidirectional reflector is made from an omnidirectional one-dimensional photonic crystal having a reflectance characteristic that substantially permits total reflection of the remainder of the primary light with any incident angle and polarization back to the wavelength-converting member.

Abstract: A reflector window includes a light transmission window having a center and an outer edge and an optical coating of at least first and second materials having differing refractive indices deposited on a proximate side of the light transmission window. The optical coating includes a plurality of alternating layers of the first and second materials with each layer having a thickness which increases from the center to the outer edge of the light transmission window.

Abstract: An infrared lighting device for motor vehicles, for example a headlight, has a radiation source and a filter, whereby the device emits white and infrared radiation at a certain intensity in a wavelength range between 800 and 1200 nm on one axis, and the filter at a first angle may transmit a first visible part and at a second angle different from the first may transmit a second visible part of the radiation source, and both parts transmitted form white light.

Abstract: Provided is a projector light source which can effectively project a light beam having a sufficient volume from a lamp as a light source, and which is highly accurate and is excellent in workability. The projector light source comprising an arc tube for emitting a light beam; and a concave reflector including a hold part for holding the arc tube, and having a concave reflection surface for reflecting the light beam from the arc tube so that the light beam outgoes through an opening of the reflector, the concave reflector comprising a first reflector located in the vicinity of the hold part for holding the light emitting tube, and second reflector located in a part other than the hold part, and made of a material different from that of the first reflector. Further, the first reflector is made of heat-resistant glass, and the second reflector is made a material containing a heat-resistant organic material having a thermal deformation temperature which is lower than that of the heat-resistant glass.

Abstract: A lamp assembly includes a reflector body having an integral crimping portion that extends inwardly over a channel formed in the reflector body, a seal feature arranged within the channel, a cathode assembly having an edge feature extending into the channel, and a resilient member held in a state of compression between the crimping portion and a first surface of the edge feature such that an opposing second surface of the edge member is held against the sealing feature thereby creating a hermetic seal between the cathode assembly and the reflector body.

Abstract: An optical plate for a display and a backlight assembly having the optical plate, the optical plate including an optical layer including infrared ray absorbing members that absorb infrared rays in a wavelength range (e.g., about 850 nanometers (nm) to about 1400 nanometers (nm)) used by a remote control of a display device.

Abstract: A method for controlling a lighting device that consists of at least a lighting source, a color sequential device and a single light valve consisting of an array of light processing elements that are controlled by bits, the method comprising the steps of emitting a light beam with said light source, filtering said light beam by said color sequential device to achieve a colored light beam and processing said colored light beam with a bit depth of less than 16.

Abstract: A reflector for use in a projection system comprises an anodized metal substrate having a metal oxide layer. The metal oxide layer has a plurality of pores. A light absorbing pigment is deposited into each of the pores such that the light absorbing pigment and the metal oxide layer form a light absorbing layer on the metal substrate.

Abstract: The present invention relates to a low profile, handheld inspection lamp with a unique configuration. Light of different wavelengths is emitted along different portions of the length, and an opaque slider allows the user to select the preferred wavelength of light for a particular task.

Abstract: A method of processing light includes receiving an image to be displayed. The image has a brightness level. The method further includes generating light from a light source and intensity-modulating the generated light to produce light having a first intensity. The first intensity is a function of the brightness level. The method also includes spatially integrating the intensity-modulated light.

Abstract: The present invention provides an improved lamp, and lighting fixture incorporating such a lamp, wherein the lamp's envelope includes a special optical coating system configured to more effectively reflect infrared light back toward the lamp filament, thereby enhancing the lamp's luminous efficacy. Multiple embodiments are disclosed, including coating systems deposited on one or both surfaces of the lamp envelope and including coating systems incorporating either a dielectric coating alone or specific combinations of a dielectric coating and a transparent conductive coating.

Abstract: The invention relates to a light module with at least one light source (4) and a reflector (2), which is arranged so as to reflect the light radiation emitted by the light source (4), a colored anodized layer (22) being formed on at least regions of the upper side (21), which is formed so as to reflect the light radiation, of the reflector (2), which anodized layer is in the form of a spectral filter for the light radiation impinging from the light source (4).

Abstract: An infrared headlight useful in a night vision system may be made with an infrared emitter positioned in a reflector. The radiation source is associated with a filter body which has a first filter layer part and a second uncoated part. The two parts are designed so the radiation transmitted through the uncoated part strikes a different area of the reflector than the infrared radiation transmitted through the filter layer. The two regions of the reflector may have differing reflective characteristics.

Abstract: A uniform light generating system for adjusting output brightness, including a light-generating unit, a light-transmitting unit, a hollow spheroid unit, a light-sensing unit, and a control unit. The light-generating unit has a light-emitting element for generating light beams and a brightness control element for adjusting the luminous flux of the light beam. The hollow spheroid unit is communicated with the other side of the light-transmitting unit for guiding the light beams into an external casing of the hollow spheroid unit. The light-sensing unit detects electric power values in the external casing. The control unit is electrically connected to the light-generating unit and the light-sensing unit. Thereby a user can obtain a real illumination value via adjusting the illumination values of the light beams that are projected from the hollow spheroid unit.

Abstract: An illuminating device is made from a transparent hollow envelope that encloses a filler gas. The envelope has inner and outer surfaces. The illuminating device has a coating of a fluorescent material deposited on the inner surface of the transparent envelope where the fluorescent material emits light having a visible component and an ultraviolet component; and a titanium dioxide film having first and second opposing surfaces where the first surface of the titanium dioxide film is formed on the outer surface of the transparent envelope. A light transmittance of the titanium dioxide film is at least 50% for light having a wavelength of 550 nm, and the light transmitted from the fluorescent material through the transparent envelope and the first surface of the titanium dioxide film to the second surface thereof causes photocatalytic activity to be generated on the second surface of the titanium dioxide film.

Abstract: Optical assemblies include a light emitter having at least one layer of a transparent film, sheet or plate through which light emitted by the light emitter passes. A pattern of deformities of well defined shape on or in at least one side of the film, sheet or plate control an output ray angle distribution of light emitted by the assemblies to suit a particular application. The film, sheet or plate causes a change in color or color correction in the light emitted by the assemblies.

Abstract: Disclosed is a display device at a low cost which enhances the color purity of light to be projected, and which resists deterioration due to ambient light such as infrared ray. This display device includes an LED, an optical member for selectively outputting light components, of which wavelength is a predetermined minimum-limit wavelength or longer, from incident light, and a mirror for selectively reflecting light components, of which wavelength is a predetermined maximum-limit wavelength or shorter, from irradiated light. One of the optical member or the mirror receives light directly from the LED, and outputs it to the other. Subsequently, the other receives the light from one of the optical member and the mirror, and outputs it.

Abstract: A flash module includes a first light source emitting a first primary light has a first wavelength-converting overlay disposed on the first light source to provide a first color of light. The first wavelength-converting overlay includes a first plurality of quantum dots dispersed in a matrix material. The flash module also includes a second light source providing a second color of light.

Abstract: A projection type video display is provided with three LED light sources. Lights emitted from each LED light source are guided into a light incidence surface of a rod integrator by a cross dichroic mirror. In a first light incidence area (an area opposite to a LED light source in red) of the cross dichroic mirror, a first dichroic mirror is provided, and in a second light incidence area (an area opposite to a LED light source in blue) of the cross dichroic mirror, a second dichroic mirror is provided. The first dichroic mirror transmits the light in red and reflects lights in other colors, and the second dichroic mirror transmits the light in blue and reflects lights in other colors.

Abstract: A straw holder for supporting a drinking straw in the mouth of a bottle is presented. The holder includes a straw support portion dimensioned for placement across the mouth of a bottle. The straw support portion includes an aperture designed to receive a straw therethrough and to vertically support the straw with respect to the support portion. The holder further includes a bottle retaining portion that includes at least one turn extending around the retaining portion. The at least one turn includes a first turn having an end attached to the straw support portion.

Abstract: An exhibit including a non-planar outer piece formed from a plurality of substantially flat lenticular panels. The outer piece defines an interior and is configured to display an external view of the interior through the plurality of substantially flat lenticular panels.

Abstract: Lighting apparatus for an image-gathering device, includes a light frame supporting a plurality of light emitting diode lamps configured to emit light at a tungsten balanced colour temperature, and a focussing frame comprising a plurality of light focussing lenses configured to focus light emitted from said light frame into an elliptical beam. The focussing frame is configured to focus light into an elliptical beam to complement a subject illumination area frame having a ratio 16:9. The light emitting diode lamps are configured to emit light at a colour temperature of 3200 Kelvin or 5600 Kelvin, and to emit light having a colour rendering index of 90. The focussing frame is releasably mountable to the light frame.

Abstract: A backlight module and a flat panel display using the same. The backlight module comprises a light source device and light guide plate adjacent to the light source device. The light source device comprises a high intensity discharge lamp, a reflector having an opening and surrounding the high intensity discharge lamp, and a cover covering the opening. The high intensity discharge lamp radiates so brilliant that it can be a single light source. When single light source is failed, it is convenient to solely exchange a new one at once. The flat panel display comprises the backlight module and a display panel disposed over the light guide plate. The light source device and the light guide plate are applied to the flat panel display so that the replacement of the light source device for the flat panel display becomes convenient.

Abstract: A color wheel includes lens structures, which are formed on a surface of a substrate opposite to a surface having filter sectors, and which have curved surfaces formed at their abutting ends and positioned along a boundary between adjacent filter sectors. Light impinging on an area of the substrate corresponding to the boundary is deflected due to one of the curved surfaces so as to be surely guided into one of the adjacent filter sectors and to be duly dispersed into a predetermined color, whereby light can be efficiently utilized.