CA2488271C - Lighting devices for controlled distribution and for panel radiation - Google Patents
Lighting devices for controlled distribution and for panel radiation Download PDFInfo
- Publication number
- CA2488271C CA2488271C CA002488271A CA2488271A CA2488271C CA 2488271 C CA2488271 C CA 2488271C CA 002488271 A CA002488271 A CA 002488271A CA 2488271 A CA2488271 A CA 2488271A CA 2488271 C CA2488271 C CA 2488271C
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- Prior art keywords
- optical component
- light
- light source
- component parts
- ridges
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/0006—Coupling light into the fibre
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0025—Combination of two or more reflectors for a single light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
- F21V2200/10—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type
- F21V2200/17—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type characterised by the admission of light into the guide
Abstract
Disclosed is a lighting device in a radiation panel type, comprising a substantially rectangular enclosure, a pair of substantially planar optical component parts within the enclosure and having optically smooth faces which are facing each other in distances varying gradually in traveling from one end to an opposite end of the pair of optical component parts, wherein one of the optical component parts is transparent and the other is reflective, and a light source apparatus to enter light between the faces at an end of the optical component parts and the enclosure, whereby the entered light reflects off of the reflective optical component part and radiates out through the transparent optical component part.
Description
LIGHTING DEVICES FOR CONTROLLED DISTRIBUTION
AND FOR PANEL RADIATION
This is a divisional application of Canadian Patent Application Serial No.
AND FOR PANEL RADIATION
This is a divisional application of Canadian Patent Application Serial No.
2,219,239 f led on October 23, 1997.
FIELD OF THE INVENTION
The present invention relates in general to lighting devices for controlled distribution of light or for uniform radiation through the panels of such lighting devices. It should be understood that the expression "the invention" and the like encompasses the subject matter of both the parent and the divisional application.
BACKGROUND OF THE INVENTION
The conventional methods of controlling distribution of light of a lamp are to redirect or control flux of a light source with a reflector or a lens, or to cut a part of flux with an absorption body in order to eliminate the light which goes to outside of the desired area. However, the elimination of a part of the flux of a lamp for such an improvement has resulted in a low energy efficiency. Many of the conventional lighting devices for uniform radiation through the panels of such lighting devices have a plurality of fluorescent lamps behind each of the translucent diffusion panels and radiate the flux of lamps out through each of the diffusion panels.
Such devices have failed to have sufficiently uniform light intensity throughout the radiation panel due to cause of light and dark bands on the surface of the radiation panel along the arrangement of the fluorescent lamps.
Elimination of such tight and dark bands by arranging the lamps closer to one another or by using a high diffusion panel of conventional translucent material for the radiation panel decreases the energy efficiency.
It is an objective of the present invention to pro'v'ide a lighting device in a distribution control type which forwards much greater amount of the flux of a lamp (lamps) into a specified range of light distribution and much less amount of the flux to the outside of the range than any conventional device does, ie. a lightir~g device in a distribution c~trol type which provides a desired light distribution with a high energy efficiency.
It is a further objective of the present invention to provide a lighting device in a radiation. panel type with no cause of light and dark bands an the radiation panel, i.e. uniform radiation throughtout the panel arith a high energy efficiency in exploitation of the above light distribution control technology.
SUMMARY OF THE INVENTION
A lighting device in a controlled distribution type in regard to the present invention comprises an artificial light source, a means to redirect the flux of the light source and a light diffuser which diffuses such redirected flux in specific directions, wherein the diffuses has a transparent or reflective body comprising a plurality of ridges or ridges and grooves arranged, whereby redirected flux of light incident to a face of the arrangement is diffused.
More specifically, the present invention provides a lighting device for a controlled distribution of light, comprising a light source; a flat reflector positioned in front of the light source and angled to redirect a flux from the light source, an ellipsoidal reflector positioned behind the light source and positioned to reflect light toward the flat reflector, and a diffuser which diffuses such redirected flux into specific directions, wherein the diffuser is a transparent body or a reflective body embodying a plurality of ridges or ridges and grooves arranged, wherein each of the ridges in the arrangement of ridges, or at least each of either ridges or grooves in the arrangement of ridges and grooves has a cross-sectional shape that is partially circular, elliptic, sine curved or curved in other way, whereby redirected flux incident to either face of the diffuser is diffused in specific direction.
The present invention also provides a lighting device in a radiation panel type, comprising a substantially rectangular enclosure, a pair of substantially planar optical component parts within the enclosure and having optically smooth faces which are facing each other in distances varying gradually in traveling from one end to an opposite end of the pair of optical component parts, wherein one of the optical component parts is transparent and the other is reflective, and a light source apparatus to enter light between the faces at an end of the optical component parts and the enclosure, whereby the entered light reflects off of the reflective optical component part and radiates out through the transparent optical component part.
The redirection of the flux of the light source may be made with a reflector which provides the fluz of the light source in specific beam angle. Optical fibers or a light guide pipe may transmit such beam of flux to the diffuser at a distant place. A
higher energy efficiency can be obtained by further redirecting a part of diffused rays which were to be directed to outside of a desired range of light distribution, into the desired range arith an additional reflector.
A lighting device in a radiation panel type in regard to the present invention comprises a pair of optical component parts having optically smooth faces which are facing each other in distances varying in traveling from one end to the opposit end of the optical component parts, wherein at least one of the said component parts is transparent, 'and one or a plurality of light sources so placed at one end or both the opposit ends of the said component parts that the flux of the light sources) enters between the said faces and radiates out through the transparent component part.
A lighting device in a controlled distribution type in regard to the present invention may be used for the light source of the above lighting device in a radiation panel type as well as a fluorescent lamp with a reflector which redirects its flux between the said faces.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 is a schematic view of a structure of a lighting device in a controlled distributuion type in regard to the present invention ;
Figure 2 is a schematic presentations of a light distributuion obtained with the lighting device described in Figure 1 Figure 3 is cross- sectional schematic views of the diffuser in Figure 1 in variation, wherein "C" or a single solid line represents a circle, a cizrular arc or a curve, and a double solid line represnts a Straight line Figure 4 is a schematic view of the structure of a lighting device in a controlled distributuion type in regard to the present invention using a set of reflectors to further control diffused rays :
Figure 5 is schematic presentations of a lgith distributuion obtained with the lighting device described in Figure 4, wherein "(a)' represents the light distributuion in the cross- section at Line A, and "(b)' represents the same at Line B ;
Figure 6 is a perspective view- of flux obtained with the lighting device described in Figure ~
Figure 7 is a perspective view of a lighting device in a radiatiaan panel type in regard to the present invention, wherein the distance between the face of the radiation panel and the face of the reflection parcel gradually decreases in traveling from the light entering end to the opposit end Figure 8 is a presentati~. of the distributuion of light intensities obtained on the radiation panel of the lighting device described in Figure ?, wherein a conventional acrylic translucent diffusion paael is used as the radiation panel ;
Figure 9 is a presentation of the distribution of light intensities obtained on the radiation panel of the lighting device described in Figure 7, wherein a diffuser described in Figure 3 is used as the radiation panel ;
Figure 10 is a perspective view of the structure of a lighting device in a radiation panel type, wherein the distance between the face of the radiation panel and the face of the reflection panel gradually decreases towards the middle line of the radiation panel, and light enters from both the opposit ends of the optical component ;
Figure 11 is a perspective partial view of the lighting device descn'bed in Figure 10, wherein fluorescent lamps are used as the light sources.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shovsrs that the flux of a 35 watt short-arc metal-halide lamp 1 is collected and redirects into a condensed beam with an ellipsoidal reflector 2 and a spherical reflector 3, and partially further redirected the beam with . a flat reflector 4 to a transparent diffusion body 5 which has a "diffusion axis X". All the said reflectors are made by making specific optical coating on their glass bodies so that they ref lect visible rays, transmit infrared rays and consequently eliminate most of infrared rays from the beam incident to the diffuser 5. The ellipsoidal reflector 2 alone or together with the spherical reflector 3 constitutes the first means to redirect the flux, and the flat reflector 4 constitutes the second nneans for the redirection in regard to the present invention.
Projection of the diffused rays from the diffuser 5 to a wall provides a light distribution ~ as shown in Figure 2.
The diffuser 5 is a transparent acrylic plate which emobodies a plurality of ridges nexting to ane another on a face of the said plate. wherein each of the ridges has cross - sectional shape of a circular arc. The diffuser 5 may also be a transparent plate emboding an arrangement of a plurality of either ridges or ridges and grooves each of which has a cross- sectional shape that is partially circular, elliptic, sine curved or curved in any other way as shown in Figure 3. The diffuser 5 may also be either a transparent or a reflective body of plurality of mono-filaments or cylinders bundled together.
Optical fibers or a light guide pipe may receive the flux condensed by the ellipsoidal reflector 2 alone or with the spherical reflector 3, directly from the ellipsoidal reflector 2 or through the flat reflector 4, in order to transmit the flux to the diffuser S
at a distant place. Projection of the diffused rays to a wall with the flux thus redirected and transfe~d provides a light distrifution similar to one shown in Figure 2.
As shown in Figure 4, a set of flat riflector 6 is so placed. in front of the diffuser 6 that such set of reflectors controls the direction of the diffused rays. Projection of the flux of such controlled diffused rays to a wall at distance A and B are shown in Figure 5 - (a) and (b). The shapes of the light distribution at distance A and B represent the cross- sectional shapes of the flux at distance A and l~ This implies that the diffusion from the diffuser 5 is controlled into a shape of a fivstum of pyramid which expands forwards.
Figure 7 shows a thin box having thickness of 15 cm, bight of 50 cm and width of 100 do is used as the radiation panel ?, and a 3 nun thick acrylic reflection panel 8 is placed behind the radiation panel ?, keeping the reflective surface faced to the radiation panel 7. The distance between the said panels is set to be 13.? cm at one of the shorter ends 9 of the box and gradually decreased towards the opposit end 10, in a straight line. Reflection panels 11 and 12 are placed at both the longer ends, keeping the reflective faces fnside.
Flux of light which has a shape of a frustrum of pyramid as shown in Figure 6, enteres between the radiation panel 7 and reflection panel 8 at the end 9 of thus structured optical component 13. The distribution of the light intensities on the surface of the radiation panel 7 is shown in Figure 8. Each number on the radiation panel shows the intensity in lux at each point where such number is shown. The result implies the following Average intensity . 1873 lux ty ~ Max. intensity ~ : 2200 Uniformi ~ intensity 1700 ~ 1.3 Total flux radiated 1873 x 0.5 i 0.3~
Total flux radiated ~ ' 2700 In the above optical component 13, the translucent radiation panel 7 is replaced with a transparent diffusion panel which has the structure the same to the diffuser 5. The diffusion panel is so placed that its ridges face outside and is orthogonal to the longitudinal axis of the optical compornent 13. Light intensities vn the radiation panel ~ made of such diffusion panel is shown in Figure 9_. The result implies the following Average intensity . 2I73 lua Uniformity M~ intensity ~ .~ 1.25 Min. intensity ~ ' 20p0 . Total flux radiated 1086 x 0.5 i °~ ~ Total flux radiated , ~ X00 -~ 0.4 Figure 10 shows the optical component 13, wherein the distance between the radiation panel 7 and the reflection panel 8 gradually decreases in traveling from both the said opposit ends 9 and 10 _g_ to the middle line of such two ends. Flux of a fluorescent lamp enters between the said panels at each of the said opposit ends 9 and 10.
In any of the above lighting devices in a radiation panel type, an increase of the distance between the said panels T and 8 towards the opposit end or the middle line for a short distance from each light entering end improves the uniformity of the radiation over the surface of the radiation panel '~.
FIELD OF THE INVENTION
The present invention relates in general to lighting devices for controlled distribution of light or for uniform radiation through the panels of such lighting devices. It should be understood that the expression "the invention" and the like encompasses the subject matter of both the parent and the divisional application.
BACKGROUND OF THE INVENTION
The conventional methods of controlling distribution of light of a lamp are to redirect or control flux of a light source with a reflector or a lens, or to cut a part of flux with an absorption body in order to eliminate the light which goes to outside of the desired area. However, the elimination of a part of the flux of a lamp for such an improvement has resulted in a low energy efficiency. Many of the conventional lighting devices for uniform radiation through the panels of such lighting devices have a plurality of fluorescent lamps behind each of the translucent diffusion panels and radiate the flux of lamps out through each of the diffusion panels.
Such devices have failed to have sufficiently uniform light intensity throughout the radiation panel due to cause of light and dark bands on the surface of the radiation panel along the arrangement of the fluorescent lamps.
Elimination of such tight and dark bands by arranging the lamps closer to one another or by using a high diffusion panel of conventional translucent material for the radiation panel decreases the energy efficiency.
It is an objective of the present invention to pro'v'ide a lighting device in a distribution control type which forwards much greater amount of the flux of a lamp (lamps) into a specified range of light distribution and much less amount of the flux to the outside of the range than any conventional device does, ie. a lightir~g device in a distribution c~trol type which provides a desired light distribution with a high energy efficiency.
It is a further objective of the present invention to provide a lighting device in a radiation. panel type with no cause of light and dark bands an the radiation panel, i.e. uniform radiation throughtout the panel arith a high energy efficiency in exploitation of the above light distribution control technology.
SUMMARY OF THE INVENTION
A lighting device in a controlled distribution type in regard to the present invention comprises an artificial light source, a means to redirect the flux of the light source and a light diffuser which diffuses such redirected flux in specific directions, wherein the diffuses has a transparent or reflective body comprising a plurality of ridges or ridges and grooves arranged, whereby redirected flux of light incident to a face of the arrangement is diffused.
More specifically, the present invention provides a lighting device for a controlled distribution of light, comprising a light source; a flat reflector positioned in front of the light source and angled to redirect a flux from the light source, an ellipsoidal reflector positioned behind the light source and positioned to reflect light toward the flat reflector, and a diffuser which diffuses such redirected flux into specific directions, wherein the diffuser is a transparent body or a reflective body embodying a plurality of ridges or ridges and grooves arranged, wherein each of the ridges in the arrangement of ridges, or at least each of either ridges or grooves in the arrangement of ridges and grooves has a cross-sectional shape that is partially circular, elliptic, sine curved or curved in other way, whereby redirected flux incident to either face of the diffuser is diffused in specific direction.
The present invention also provides a lighting device in a radiation panel type, comprising a substantially rectangular enclosure, a pair of substantially planar optical component parts within the enclosure and having optically smooth faces which are facing each other in distances varying gradually in traveling from one end to an opposite end of the pair of optical component parts, wherein one of the optical component parts is transparent and the other is reflective, and a light source apparatus to enter light between the faces at an end of the optical component parts and the enclosure, whereby the entered light reflects off of the reflective optical component part and radiates out through the transparent optical component part.
The redirection of the flux of the light source may be made with a reflector which provides the fluz of the light source in specific beam angle. Optical fibers or a light guide pipe may transmit such beam of flux to the diffuser at a distant place. A
higher energy efficiency can be obtained by further redirecting a part of diffused rays which were to be directed to outside of a desired range of light distribution, into the desired range arith an additional reflector.
A lighting device in a radiation panel type in regard to the present invention comprises a pair of optical component parts having optically smooth faces which are facing each other in distances varying in traveling from one end to the opposit end of the optical component parts, wherein at least one of the said component parts is transparent, 'and one or a plurality of light sources so placed at one end or both the opposit ends of the said component parts that the flux of the light sources) enters between the said faces and radiates out through the transparent component part.
A lighting device in a controlled distribution type in regard to the present invention may be used for the light source of the above lighting device in a radiation panel type as well as a fluorescent lamp with a reflector which redirects its flux between the said faces.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 is a schematic view of a structure of a lighting device in a controlled distributuion type in regard to the present invention ;
Figure 2 is a schematic presentations of a light distributuion obtained with the lighting device described in Figure 1 Figure 3 is cross- sectional schematic views of the diffuser in Figure 1 in variation, wherein "C" or a single solid line represents a circle, a cizrular arc or a curve, and a double solid line represnts a Straight line Figure 4 is a schematic view of the structure of a lighting device in a controlled distributuion type in regard to the present invention using a set of reflectors to further control diffused rays :
Figure 5 is schematic presentations of a lgith distributuion obtained with the lighting device described in Figure 4, wherein "(a)' represents the light distributuion in the cross- section at Line A, and "(b)' represents the same at Line B ;
Figure 6 is a perspective view- of flux obtained with the lighting device described in Figure ~
Figure 7 is a perspective view of a lighting device in a radiatiaan panel type in regard to the present invention, wherein the distance between the face of the radiation panel and the face of the reflection parcel gradually decreases in traveling from the light entering end to the opposit end Figure 8 is a presentati~. of the distributuion of light intensities obtained on the radiation panel of the lighting device described in Figure ?, wherein a conventional acrylic translucent diffusion paael is used as the radiation panel ;
Figure 9 is a presentation of the distribution of light intensities obtained on the radiation panel of the lighting device described in Figure 7, wherein a diffuser described in Figure 3 is used as the radiation panel ;
Figure 10 is a perspective view of the structure of a lighting device in a radiation panel type, wherein the distance between the face of the radiation panel and the face of the reflection panel gradually decreases towards the middle line of the radiation panel, and light enters from both the opposit ends of the optical component ;
Figure 11 is a perspective partial view of the lighting device descn'bed in Figure 10, wherein fluorescent lamps are used as the light sources.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shovsrs that the flux of a 35 watt short-arc metal-halide lamp 1 is collected and redirects into a condensed beam with an ellipsoidal reflector 2 and a spherical reflector 3, and partially further redirected the beam with . a flat reflector 4 to a transparent diffusion body 5 which has a "diffusion axis X". All the said reflectors are made by making specific optical coating on their glass bodies so that they ref lect visible rays, transmit infrared rays and consequently eliminate most of infrared rays from the beam incident to the diffuser 5. The ellipsoidal reflector 2 alone or together with the spherical reflector 3 constitutes the first means to redirect the flux, and the flat reflector 4 constitutes the second nneans for the redirection in regard to the present invention.
Projection of the diffused rays from the diffuser 5 to a wall provides a light distribution ~ as shown in Figure 2.
The diffuser 5 is a transparent acrylic plate which emobodies a plurality of ridges nexting to ane another on a face of the said plate. wherein each of the ridges has cross - sectional shape of a circular arc. The diffuser 5 may also be a transparent plate emboding an arrangement of a plurality of either ridges or ridges and grooves each of which has a cross- sectional shape that is partially circular, elliptic, sine curved or curved in any other way as shown in Figure 3. The diffuser 5 may also be either a transparent or a reflective body of plurality of mono-filaments or cylinders bundled together.
Optical fibers or a light guide pipe may receive the flux condensed by the ellipsoidal reflector 2 alone or with the spherical reflector 3, directly from the ellipsoidal reflector 2 or through the flat reflector 4, in order to transmit the flux to the diffuser S
at a distant place. Projection of the diffused rays to a wall with the flux thus redirected and transfe~d provides a light distrifution similar to one shown in Figure 2.
As shown in Figure 4, a set of flat riflector 6 is so placed. in front of the diffuser 6 that such set of reflectors controls the direction of the diffused rays. Projection of the flux of such controlled diffused rays to a wall at distance A and B are shown in Figure 5 - (a) and (b). The shapes of the light distribution at distance A and B represent the cross- sectional shapes of the flux at distance A and l~ This implies that the diffusion from the diffuser 5 is controlled into a shape of a fivstum of pyramid which expands forwards.
Figure 7 shows a thin box having thickness of 15 cm, bight of 50 cm and width of 100 do is used as the radiation panel ?, and a 3 nun thick acrylic reflection panel 8 is placed behind the radiation panel ?, keeping the reflective surface faced to the radiation panel 7. The distance between the said panels is set to be 13.? cm at one of the shorter ends 9 of the box and gradually decreased towards the opposit end 10, in a straight line. Reflection panels 11 and 12 are placed at both the longer ends, keeping the reflective faces fnside.
Flux of light which has a shape of a frustrum of pyramid as shown in Figure 6, enteres between the radiation panel 7 and reflection panel 8 at the end 9 of thus structured optical component 13. The distribution of the light intensities on the surface of the radiation panel 7 is shown in Figure 8. Each number on the radiation panel shows the intensity in lux at each point where such number is shown. The result implies the following Average intensity . 1873 lux ty ~ Max. intensity ~ : 2200 Uniformi ~ intensity 1700 ~ 1.3 Total flux radiated 1873 x 0.5 i 0.3~
Total flux radiated ~ ' 2700 In the above optical component 13, the translucent radiation panel 7 is replaced with a transparent diffusion panel which has the structure the same to the diffuser 5. The diffusion panel is so placed that its ridges face outside and is orthogonal to the longitudinal axis of the optical compornent 13. Light intensities vn the radiation panel ~ made of such diffusion panel is shown in Figure 9_. The result implies the following Average intensity . 2I73 lua Uniformity M~ intensity ~ .~ 1.25 Min. intensity ~ ' 20p0 . Total flux radiated 1086 x 0.5 i °~ ~ Total flux radiated , ~ X00 -~ 0.4 Figure 10 shows the optical component 13, wherein the distance between the radiation panel 7 and the reflection panel 8 gradually decreases in traveling from both the said opposit ends 9 and 10 _g_ to the middle line of such two ends. Flux of a fluorescent lamp enters between the said panels at each of the said opposit ends 9 and 10.
In any of the above lighting devices in a radiation panel type, an increase of the distance between the said panels T and 8 towards the opposit end or the middle line for a short distance from each light entering end improves the uniformity of the radiation over the surface of the radiation panel '~.
Claims (7)
1. A lighting device in a radiation panel type, comprising:
a substantially rectangular enclosure;
a pair of substantially planar optical component parts within said enclosure and having optically smooth faces which are facing each other in distances varying gradually in traveling from one end to an opposite end of the pair of optical component parts, wherein one of the optical component parts is transparent and the other is reflective; and a light source apparatus to enter light between said faces at an end of said optical component parts and said enclosure, whereby the entered light reflects off of said reflective optical component part and radiates out through the transparent optical component part.
a substantially rectangular enclosure;
a pair of substantially planar optical component parts within said enclosure and having optically smooth faces which are facing each other in distances varying gradually in traveling from one end to an opposite end of the pair of optical component parts, wherein one of the optical component parts is transparent and the other is reflective; and a light source apparatus to enter light between said faces at an end of said optical component parts and said enclosure, whereby the entered light reflects off of said reflective optical component part and radiates out through the transparent optical component part.
2. The device of claim 1, wherein the distance between said faces of the optical component parts gradually decreases in traveling from one end to the opposite end of said optical component parts.
3. The device of claim 1, wherein the distance between said faces gradually decreases in traveling from both said opposite ends to a middle line of said two ends.
4. The device of claim 1, wherein the distance between said faces increases towards the opposite end or a middle line of said two ends for a short distance from each light entering end.
5. ~The device of any one of claims 1 to 4, wherein said light source apparatus further comprises:
a light source;
a flat reflector positioned in front of said light source and angled to redirect a flux from said light source;
an ellipsoidal reflector positioned behind the light source and positioned to reflect light toward said flat reflector; and a diffuser which diffuses such redirected flux into specific directions, wherein the diffuser is a transparent body or a reflective body embodying a plurality of ridges or ridges and grooves arranged, wherein each of the ridges in the arrangement of ridges, or at least each of either ridges or grooves in the arrangement of ridges and grooves has a cross-sectional shape that is partially circular, elliptic, sine curved or curved in other way, whereby redirected flux incident to either face of the diffuser is diffused in specific directions.
a light source;
a flat reflector positioned in front of said light source and angled to redirect a flux from said light source;
an ellipsoidal reflector positioned behind the light source and positioned to reflect light toward said flat reflector; and a diffuser which diffuses such redirected flux into specific directions, wherein the diffuser is a transparent body or a reflective body embodying a plurality of ridges or ridges and grooves arranged, wherein each of the ridges in the arrangement of ridges, or at least each of either ridges or grooves in the arrangement of ridges and grooves has a cross-sectional shape that is partially circular, elliptic, sine curved or curved in other way, whereby redirected flux incident to either face of the diffuser is diffused in specific directions.
6. The device of any one of claims 1 to 5, wherein a fluorescent lamp is used as said light source.
7. The device of any one of claims 1 to 6, wherein the distance between said faces increases toward the opposite end or a middle line of said two ends for a short distance from each light entering end and the decrease of the distance occurs succeeding to such increase of the distance.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002219239A CA2219239C (en) | 1996-04-19 | 1997-10-23 | Lighting devices for controlled distribution and for panel radiation |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002219239A Division CA2219239C (en) | 1996-04-19 | 1997-10-23 | Lighting devices for controlled distribution and for panel radiation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2488271A1 CA2488271A1 (en) | 1999-04-23 |
| CA2488271C true CA2488271C (en) | 2005-08-16 |
Family
ID=34120654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002488271A Expired - Fee Related CA2488271C (en) | 1997-10-23 | 1997-10-23 | Lighting devices for controlled distribution and for panel radiation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2488271C (en) |
-
1997
- 1997-10-23 CA CA002488271A patent/CA2488271C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2488271A1 (en) | 1999-04-23 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |