WO2001069123A1 - High efficiency illumination system incorporating lamp safety reflector - Google Patents

High efficiency illumination system incorporating lamp safety reflector Download PDF

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Publication number
WO2001069123A1
WO2001069123A1 PCT/US2001/007566 US0107566W WO0169123A1 WO 2001069123 A1 WO2001069123 A1 WO 2001069123A1 US 0107566 W US0107566 W US 0107566W WO 0169123 A1 WO0169123 A1 WO 0169123A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
illumination
shield
reflector
illumination region
Prior art date
Application number
PCT/US2001/007566
Other languages
French (fr)
Inventor
Kurt Hecht
Robert Michael Beideman
Michael Veksland
Original Assignee
Accu-Sort Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Accu-Sort Systems, Inc. filed Critical Accu-Sort Systems, Inc.
Priority to AU2001240129A priority Critical patent/AU2001240129A1/en
Publication of WO2001069123A1 publication Critical patent/WO2001069123A1/en

Links

Classifications

    • 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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/08—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures
    • F21V11/12—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures of slot type
    • 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
    • F21V13/10—Combinations of only two kinds of elements the elements being reflectors and screens
    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/04—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the light source
    • 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
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/02—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken
    • 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
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F21V7/0016—Reflectors for light sources providing for indirect lighting on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/403—Lighting for industrial, commercial, recreational or military use for machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the present invention generally relates to an apparatus for illuminating coded information symbols. More particularly, the present invention relates to an illumination system which selectively reflects and redirects illumination towards a working area and also includes a safety shield to disperse energy in the event of a lamp rupture.
  • Erroneous imaging of human or machine readable symbologies often results from many different factors. However, a primary cause of erroneous imaging is poor lighting conditions. Proper illumination is one of the most important requirements for any machine imaging system.
  • the illumination of an object or a label thereupon is particularly critical for high speed scanning systems that employ image sensors, such as CCD or CMOS detectors.
  • the ability of an image-based scanning system to accurately detect an object depends upon the amount of light that is reflected from the region of illumination onto the image sensor. The amount of light detected by the image sensor is a function of both the integration period and the intensity of illumination.
  • variable speed conveyors wherein the conveyor speed varies with the volume of packages handled by the system. If a low intensity illumination level is selected for low speed conveyor operation, the same illumination level may be insufficient for accurate imaging when the conveyor speed is increased. If a high intensity illumination level is selected, the light may saturate the image sensor when the conveyor is operating at low speeds. High intensity illumination sources have also been known to generate intense glare around the operating region of the scanning system. This creates an annoyance and a safety hazard to personnel operating in the vicinity of the scanning system. Additionally, high intensity illumination systems have bulbs which may catastrophically fail, (i.e. explode), thereby creating an additional safety hazard to personnel due to flying glass and debris.
  • an illumination assembly which specifically directs illumination over a working depth of field and which minimizes the hazards to personnel operating in the vicinity of the scanning system.
  • an apparatus for illuminating coded information symbols is provided with an elliptical safety reflector which includes a shield mounted between a lamp and the desired region of illumination.
  • the shield includes a cut-out for permitting illumination to pass directly from the bulb to the desired region of illumination.
  • the shield also redirects a portion of the light which would otherwise illuminate areas outside the desired region of illumination and reflects the light back to the front surface of the elliptical reflector to be distributed as defined by the shape of the reflector surface.
  • the shield also acts as a safety shield to selectively direct energy should the lamp explode.
  • Figure 1 is a high speed imaging apparatus made in accordance with the present invention.
  • Figure 2 is an illumination assembly made in accordance with the present invention.
  • Figure 3 A is a perspective view of the shield made in accordance with the present invention.
  • Figure 3B is a perspective view of an alternative embodiment of a shield made in accordance with the present invention.
  • Figure 3C is a perspective view of a second alternative embodiment of a shield made in accordance with the present invention.
  • Figure 4A is a perspective view of a dual socket lamp.
  • Figure 4B is a perspective view of a mogul-based single socket lamp.
  • Figure 5 is a fragmentary perspective view of the clamp of a shield attached to an electric socket.
  • a high speed imaging apparatus 12 is shown in Figure 1.
  • the imaging apparatus 12 comprises an imager 14 and an illumination assembly 16.
  • the imaging apparatus 12 is typically held in place above a conveyor 18 by a frame or housing 10.
  • the package 20 is illuminated to facilitate the detection of the package 20 and any human or machine readable symbologies located thereon, such as a bar code 22.
  • the invention will be described with reference to the illumination and detection of bar codes.
  • the present invention is applicable to any type of system for imaging objects or imaging human or machine readable symbologies. There are many factors which can affect the ability of the apparatus 12 to accurately detect each bar code label 22, including the speed of the conveyor 18, the illumination intensity and the ability of the apparatus 12 to accurately focus on the subject bar code label 22.
  • the present invention is directed to the problem of proper illumination.
  • the desired illumination region 24 is known to include all regions of interest over a specified width and depth, (or height). As shown in Figure 1, the illumination is directed over a working depth 24 (or desired illumination region) which is illuminated with three different "sources" of light: 1) direct light 26; 2) redirected light 28; and 3) reflected light 29. These three sources of light 26, 28, 29 will be defined with reference to Figure 2.
  • the direct light 26 emanates from the elongated lamp 30 directly toward the desired illumination region 24.
  • the direct light 26 comprises only light which emanates directly from the lamp 30, as illustrated by light beam X.
  • Redirected light 28 comprises light that has been redirected from the shield 32 toward the reflector 34 and then toward the desired illumination region 24, as illustrated by light beam Y.
  • Reflected light 29 comprises light that emanates from the lamp 30 toward the reflector 34, and is reflected by the reflector 34 toward the desired illumination region 24, as illustrated by light beam Z.
  • the illumination assembly 16 includes the reflector 34 and the shield 32, which work in cooperative arrangement with the lamp 30.
  • the shield 32 provides two separate functions. The first function is to block light from the lamp 30 which would illuminate areas other than the desired illumination region 24 and redirect the light toward the desired illumination region 24.
  • dotted line A represents a beam of light which, in the absence of the shield 32, would emanate from the lamp 30 but would not illuminate the desired illumination region 24, since this light beam A is directed outside that area. It is this type of light which would become an annoyance and safety hazard to employees operating in the vicinity of the imaging apparatus 12.
  • the light beam A ' is reflected off of the shield 32 at point 40 toward the reflector 34.
  • the light beam A' is then reflected by the reflector 34 at point 42 toward the desired illumination region 24 as redirected light 28.
  • the shield 32 not only eliminates light beam A from outlying areas which would otherwise be an annoyance and safety hazard to employees, it redirects this light A' over the desired illumination region 24. Accordingly, the effective efficiency of the lamp 30 is thereby increased. This permits a greater accuracy in symbology scanning or may even permit a reduction in the power of the lamp 30.
  • a second function of the shield 32 is to act as a safety shield to disperse energy should the lamp explode.
  • Shields made in accordance with the present invention are shown in Figures 3A-C.
  • Each shield 32 includes a body 50, a cut-out 52 and one or more clamps 54, (each clamp 54 including a pair of arms 56), extending either from a flange 58 or the body 50 itself.
  • the flanges 58 keep the clamps 54 in operative alignment with the body 50.
  • the body 50 is made of a reflective material, or coated with a reflective material, such that stray illumination as illustrated by light beam A will be eliminated and will instead be reflected as light beam A ' from the body 50 toward the reflector 34, (shown in Figure 2).
  • Direct light 26 from the lamp 30 is permitted to exit the cut-out 52 and directly illuminate the desired illumination region 24.
  • the lamp 30 is inserted into and powered by a pair of electric sockets 60, 61.
  • the clamps 54 attach onto the sockets 60, 61 and are securely held by arms 56 onto the sockets 60, 61.
  • Figure 5 further shows that the length of the flange 58 is a function of the socket design, such that the body 50 need only extend over the length of the lamp 30 and not the sockets 60, 61.
  • the body 50 may extend the entire length of the shield 32 up to the clamps 54.
  • the shield 32 of the present invention would be modified to permit such an arrangement.
  • a modified shield 32 for an elongated mogul- based single socket lamp 30 is shown in Figure 3C. It is important to note that the shield 32 should be mounted such that the position of the lamp 30, the shield 32 and the reflector 34 will be maintained at all times such that the light will be properly directed, redirected or reflected toward the desired illumination region 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A system (16) for illuminating a desired illumination region comprises a lamp (30) for providing illumination, a reflector (34) for reflecting a portion of the illumination towards said desired illumination region and a shield (32), selectively positioned between the lamp and the desired illumination region. The shield permits a portion of the illumination to pass directly from the lamp to the desired illumination region and redirects another portion of the illumination toward the reflector.

Description

HIGH EFFICIENCY ILLUMINATION SYSTEM INCORPORATING LAMP SAFETY REFLECTOR
This application claims the benefit of U.S. Provisional Application No.60/188,420 filed on March 10, 2000.
BACKGROUND
The present invention generally relates to an apparatus for illuminating coded information symbols. More particularly, the present invention relates to an illumination system which selectively reflects and redirects illumination towards a working area and also includes a safety shield to disperse energy in the event of a lamp rupture. Erroneous imaging of human or machine readable symbologies often results from many different factors. However, a primary cause of erroneous imaging is poor lighting conditions. Proper illumination is one of the most important requirements for any machine imaging system. The illumination of an object or a label thereupon is particularly critical for high speed scanning systems that employ image sensors, such as CCD or CMOS detectors. The ability of an image-based scanning system to accurately detect an object depends upon the amount of light that is reflected from the region of illumination onto the image sensor. The amount of light detected by the image sensor is a function of both the integration period and the intensity of illumination.
Many current imaging systems include variable speed conveyors, wherein the conveyor speed varies with the volume of packages handled by the system. If a low intensity illumination level is selected for low speed conveyor operation, the same illumination level may be insufficient for accurate imaging when the conveyor speed is increased. If a high intensity illumination level is selected, the light may saturate the image sensor when the conveyor is operating at low speeds. High intensity illumination sources have also been known to generate intense glare around the operating region of the scanning system. This creates an annoyance and a safety hazard to personnel operating in the vicinity of the scanning system. Additionally, high intensity illumination systems have bulbs which may catastrophically fail, (i.e. explode), thereby creating an additional safety hazard to personnel due to flying glass and debris.
Accordingly, there exists a need for an illumination assembly which specifically directs illumination over a working depth of field and which minimizes the hazards to personnel operating in the vicinity of the scanning system.
SUMMARY An apparatus for illuminating coded information symbols is provided with an elliptical safety reflector which includes a shield mounted between a lamp and the desired region of illumination. The shield includes a cut-out for permitting illumination to pass directly from the bulb to the desired region of illumination. The shield also redirects a portion of the light which would otherwise illuminate areas outside the desired region of illumination and reflects the light back to the front surface of the elliptical reflector to be distributed as defined by the shape of the reflector surface. The shield also acts as a safety shield to selectively direct energy should the lamp explode.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a high speed imaging apparatus made in accordance with the present invention.
Figure 2 is an illumination assembly made in accordance with the present invention. Figure 3 A is a perspective view of the shield made in accordance with the present invention.
Figure 3B is a perspective view of an alternative embodiment of a shield made in accordance with the present invention.
Figure 3C is a perspective view of a second alternative embodiment of a shield made in accordance with the present invention.
Figure 4A is a perspective view of a dual socket lamp.
Figure 4B is a perspective view of a mogul-based single socket lamp. Figure 5 is a fragmentary perspective view of the clamp of a shield attached to an electric socket.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) The preferred embodiment will be described with reference to the drawing figures where like numerals represent like elements throughout. A high speed imaging apparatus 12 is shown in Figure 1. The imaging apparatus 12 comprises an imager 14 and an illumination assembly 16. The imaging apparatus 12 is typically held in place above a conveyor 18 by a frame or housing 10. As a package 20 travels along the conveyor 18 it passes under the imaging apparatus 12. The package 20 is illuminated to facilitate the detection of the package 20 and any human or machine readable symbologies located thereon, such as a bar code 22. For simplicity, the invention will be described with reference to the illumination and detection of bar codes. However, the present invention is applicable to any type of system for imaging objects or imaging human or machine readable symbologies. There are many factors which can affect the ability of the apparatus 12 to accurately detect each bar code label 22, including the speed of the conveyor 18, the illumination intensity and the ability of the apparatus 12 to accurately focus on the subject bar code label 22. The present invention is directed to the problem of proper illumination.
In accordance with the present invention, the desired illumination region 24 is known to include all regions of interest over a specified width and depth, (or height). As shown in Figure 1, the illumination is directed over a working depth 24 (or desired illumination region) which is illuminated with three different "sources" of light: 1) direct light 26; 2) redirected light 28; and 3) reflected light 29. These three sources of light 26, 28, 29 will be defined with reference to Figure 2. Referring to Figure 2, the direct light 26 emanates from the elongated lamp 30 directly toward the desired illumination region 24. The direct light 26 comprises only light which emanates directly from the lamp 30, as illustrated by light beam X. Redirected light 28 comprises light that has been redirected from the shield 32 toward the reflector 34 and then toward the desired illumination region 24, as illustrated by light beam Y. Reflected light 29 comprises light that emanates from the lamp 30 toward the reflector 34, and is reflected by the reflector 34 toward the desired illumination region 24, as illustrated by light beam Z.
As shown in Figure 2, the illumination assembly 16 includes the reflector 34 and the shield 32, which work in cooperative arrangement with the lamp 30. The shield 32 provides two separate functions. The first function is to block light from the lamp 30 which would illuminate areas other than the desired illumination region 24 and redirect the light toward the desired illumination region 24. For example, dotted line A represents a beam of light which, in the absence of the shield 32, would emanate from the lamp 30 but would not illuminate the desired illumination region 24, since this light beam A is directed outside that area. It is this type of light which would become an annoyance and safety hazard to employees operating in the vicinity of the imaging apparatus 12. In accordance with the present invention, the light beam A' is reflected off of the shield 32 at point 40 toward the reflector 34. The light beam A' is then reflected by the reflector 34 at point 42 toward the desired illumination region 24 as redirected light 28. As shown, the shield 32 not only eliminates light beam A from outlying areas which would otherwise be an annoyance and safety hazard to employees, it redirects this light A' over the desired illumination region 24. Accordingly, the effective efficiency of the lamp 30 is thereby increased. This permits a greater accuracy in symbology scanning or may even permit a reduction in the power of the lamp 30.
A second function of the shield 32 is to act as a safety shield to disperse energy should the lamp explode. Shields made in accordance with the present invention are shown in Figures 3A-C. Each shield 32 includes a body 50, a cut-out 52 and one or more clamps 54, (each clamp 54 including a pair of arms 56), extending either from a flange 58 or the body 50 itself. The flanges 58 keep the clamps 54 in operative alignment with the body 50. Preferably, the body 50 is made of a reflective material, or coated with a reflective material, such that stray illumination as illustrated by light beam A will be eliminated and will instead be reflected as light beam A' from the body 50 toward the reflector 34, (shown in Figure 2). Direct light 26 from the lamp 30 is permitted to exit the cut-out 52 and directly illuminate the desired illumination region 24. As should be understood by those of skill in the art, if an elongated lamp 30 having dual sockets is used, as shown in Figure 4A, the lamp 30 is inserted into and powered by a pair of electric sockets 60, 61. As shown in Figure 5, the clamps 54 attach onto the sockets 60, 61 and are securely held by arms 56 onto the sockets 60, 61. Figure 5 further shows that the length of the flange 58 is a function of the socket design, such that the body 50 need only extend over the length of the lamp 30 and not the sockets 60, 61. Alternatively, as shown by Figure 3B, the body 50 may extend the entire length of the shield 32 up to the clamps 54. It should be understood by those skilled in the art that the present invention has been described with reference to an elongated lamp 30 with dual sockets 60, 61. However, if the present invention is used with a mogul-based single socket lamp, as shown in Figure 4B, the shield 32 of the present invention would be modified to permit such an arrangement. A modified shield 32 for an elongated mogul- based single socket lamp 30 is shown in Figure 3C. It is important to note that the shield 32 should be mounted such that the position of the lamp 30, the shield 32 and the reflector 34 will be maintained at all times such that the light will be properly directed, redirected or reflected toward the desired illumination region 24.
Although the invention has been described in part by making detailed reference to the preferred embodiment, such detail is intended to be instructive rather than restrictive. It will be appreciated by those skilled in the art that many variations may be made in the structure and mode of operation without departing from the spirit and scope of the invention as disclosed in the teachings herein.

Claims

CLAIMS What is claimed is:
1. A system for illuminating a desired illumination region comprising: a lamp for providing illumination; a reflector for reflecting a portion of the illumination toward said desired illumination region; and a shield, selectively positioned between said lamp and said desired illumination region, for permitting a portion of the illumination to pass directly from the lamp to said desired illumination region and for redirecting another portion of the illumination toward said reflector.
2. The system of claim 1 whereby the shield further comprises a body and a selectively positioned cut-out, said body for performing said redirecting and said cut-out for permitting said portion of the illumination to pass directly from the lamp to said desired illumination region.
3. The system of claim 2 wherein the shield further comprises at least one clamp including a flange coupled to said body and a pair of arms extending from said flange, said flange keeping said at least one clamp in operative alignment with said body.
4. The system of claim 3 whereby at least a portion of said body is coated with a reflective material.
5. The system of claim 2 wherein said shield further comprises at least one pair of arms extending from said body.
6. The system of claim 1 whereby the lamp is an elongated dual socket lamp which is secured and powered by dual electric sockets.
7. The system of claim 1 whereby the lamp is mogul-based lamp which is secured and powered by a single electric socket.
8. A shield for use in an illumination system having a lamp and a reflector for reflecting a portion of said illumination toward an illumination region comprising: a body for redirecting a portion of said illumination toward said reflector; said body having a cut-out for permitting a selected portion of said illumination to pass by said body without redirection or reflection; and at least one clamp, for keeping the shield in operative alignment with the lamp.
9. The shield of claim 8 whereby at least a portion of the body is coated with a reflective material.
10. The shield of claim 9 whereby said clamp further includes a flange, for keeping said body in operative alignment with said clamp.
11. The system of claim 10 whereby the lamp is an elongated dual socket lamp which is secured and powered by dual electric sockets.
12. The system of claim 10 whereby the lamp is a mogul-based lamp which is secured and powered by single electric socket.
PCT/US2001/007566 2000-03-10 2001-03-09 High efficiency illumination system incorporating lamp safety reflector WO2001069123A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001240129A AU2001240129A1 (en) 2000-03-10 2001-03-09 High efficiency illumination system incorporating lamp safety reflector

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US18842000P 2000-03-10 2000-03-10
US60/188,420 2000-03-10
US69580500A 2000-10-25 2000-10-25
US09/695,805 2000-10-25

Publications (1)

Publication Number Publication Date
WO2001069123A1 true WO2001069123A1 (en) 2001-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/007566 WO2001069123A1 (en) 2000-03-10 2001-03-09 High efficiency illumination system incorporating lamp safety reflector

Country Status (2)

Country Link
AU (1) AU2001240129A1 (en)
WO (1) WO2001069123A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519972A (en) * 1939-01-26 1940-04-10 Arthur Gautier Apparatus for masking electric lamps and other lighting means
EP0235652A2 (en) * 1986-02-19 1987-09-09 Daume & Jordan GmbH & Co KG Anti-dazzle light fitting with a strip-like screening reflector
EP0359069A2 (en) * 1988-09-14 1990-03-21 Licentia Patent-Verwaltungs-GmbH Method of manufacturing a louver for a light fitting
DE4440135A1 (en) * 1994-11-10 1996-05-15 Bamberger Ind Gmbh & Co Raster element as light deflection and aperture protection device for room and office lights

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519972A (en) * 1939-01-26 1940-04-10 Arthur Gautier Apparatus for masking electric lamps and other lighting means
EP0235652A2 (en) * 1986-02-19 1987-09-09 Daume & Jordan GmbH & Co KG Anti-dazzle light fitting with a strip-like screening reflector
EP0359069A2 (en) * 1988-09-14 1990-03-21 Licentia Patent-Verwaltungs-GmbH Method of manufacturing a louver for a light fitting
DE4440135A1 (en) * 1994-11-10 1996-05-15 Bamberger Ind Gmbh & Co Raster element as light deflection and aperture protection device for room and office lights

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