CH701854A1 - A lighting device for obtaining a uniformly illuminated field. - Google Patents

A lighting device for obtaining a uniformly illuminated field. Download PDF

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Publication number
CH701854A1
CH701854A1 CH01442/09A CH14422009A CH701854A1 CH 701854 A1 CH701854 A1 CH 701854A1 CH 01442/09 A CH01442/09 A CH 01442/09A CH 14422009 A CH14422009 A CH 14422009A CH 701854 A1 CH701854 A1 CH 701854A1
Authority
CH
Switzerland
Prior art keywords
light sources
lobe
sources
characterized
device according
Prior art date
Application number
CH01442/09A
Other languages
French (fr)
Inventor
Jean Roux
Nicolas Bassi
Original Assignee
Pasan Sa
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 Pasan Sa filed Critical Pasan Sa
Priority to CH01442/09A priority Critical patent/CH701854A1/en
Publication of CH701854A1 publication Critical patent/CH701854A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/006Solar simulators, e.g. for testing photovoltaic panels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2105/00Planar light sources
    • F21Y2105/10Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/12Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L25/00Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes
    • H01L25/04Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L51/00, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58Optical field-shaping elements

Abstract

This lighting device intended essentially for verifying the operation of photovoltaic cells comprises groups (5) of light sources (1) of the emission lobe of which the central axis is inclined with respect to the axis of the emission lobe theoretical, due to slight manufacturing defects. The sources of the same group form a series of elements numbered consecutively (1a, 1b, 1e, 1d). The direction (7) of the projection of each of the central axes of the emission lobes on the plane (2) which carries the light sources (1) forms an angle with the direction of the next source of the series. The sum of the angles is 360 °. The addition of the differently oriented lobes leads to a compensation of the defects, the resulting lobe having substantially symmetry corresponding to the desired theoretical lobe. To obtain the desired effect, it is necessary that the light sources of the same group come from the same production batch, so that they have the same defects.

Description

The present invention relates to the field of lighting devices intended to obtain a uniformly illuminated field, including devices for verifying the efficiency of cells constituting a photovoltaic panel, the lighting devices used in photography or devices for detecting objects by cameras.

In the field of testing cells and photovoltaic modules, one of the most difficult tasks is to obtain a uniformly illuminated field, so as to make possible the characterization of the efficiency of cells and modules in terms of energy produced compared to the energy received.

To this end, various methods are applied.

One of these methods is to use light sources as specific as possible and arranged as far as possible from the target to be tested. The difficulty lies mainly in the realization of a source sufficiently intense and sufficiently small dimensions so that the intensity of the radiation is similar to that of the sun and that the uniformity is sufficient on the target.

Another method is the use of multiple light sources, large emission beam and arranged in front of the modules to be tested, so that the irradiation is uniform in the center of the area. In this case, the difficulty is mainly to obtain equal intensities of each of the sources, as well as overlapping emission lobes and are sufficiently constant to ensure sufficient uniformity in the useful area.

Yet another method consists in the use of complex optical means, and more particularly of a point source and a parabolic mirror. In this case, the difficulty is not only to obtain a sufficiently small and intense source, but also to make mirrors of large dimensions, of the order of two meters in diameter, which is difficult.

The invention aims to provide a simple and inexpensive device for obtaining uniformity of the field illuminated from several light sources.

The invention is defined in the claims.

The drawings show, by way of examples and schematically, two embodiments of the invention, and the light emitting lobes of several sources. <tb> Fig. 1 <sep> schematically represents a light source that emits light upwards, the theoretical emission lobe in dotted line and the real lobe in solid lines. <tb> Fig. 2 <sep> schematically represents a first embodiment of the device according to the invention, wherein the light sources are arranged in groups of four. <tb> Fig. 3 <sep> shows the emission lobe resulting from the addition of two different lobes, the two lobes being little divergent. <tb> Fig. 4 <sep> shows the emission lobe resulting from the addition of two different lobes, the two lobes being distinctly divergent <tb> Fig. <Sep> schematically represents a second embodiment of the device according to the invention, wherein the light sources are arranged in groups of eight. <tb> Fig. 6 <sep> resumes the embodiment of FIG. 2, showing the grid grid according to which are arranged the light sources.

The invention is based on the observation that different light sources, including light emitting diodes (LEDs) or incandescent lamps associated with a reflector, emit their light according to a lobe whose shape and inclination vary according to the manufacturing parameters. In other words, the emission lobe of each source is often different from the intended theoretical lobe: instead of the lobe being symmetrical with respect to the axis passing through the center of the light source and perpendicular to the plane on which the source is fixed. it is frequently asymmetrical and its axis is inclined with respect to the theoretical perpendicular axis. In practice, the lobes are generally similar for parts from the same series of manufacture. Their faults tend to be substantially the same. If, therefore, these light sources of the same series are arranged on a plane according to a regular grid, with the same orientation, their defects will tend to be added to each other and to give to the illuminated field irradiated zones with more of intensity than others.

In order to avoid this drawback, the device according to the invention has the light sources 1 on the plane 2 to which they are fixed by varying their orientation relative to each other, so as to compensate for the defects. and to improve the general uniformity of the light received by the module or the cell to be tested.

The orientation is easy to achieve: in practice, all light sources on the market have a mark or an asymmetrical shape that can guide them. Of course, it is the central axis 6 of the emission lobe 3 of each source 1 that is to orient relative to the central axis of the next source. Since the marking or shape asymmetry of the light sources is in practice defined and realized during the manufacturing process, and the light source does not undergo angular displacement during this process before the marking or the definition of its shape, the shape or the mark has a defined and constant angle with respect to the central axis of the emission lobe. It is therefore possible to rely on this form or this mark to orient the light sources relative to each other.

To obtain a surface as uniformly illuminated as possible, it is necessary that the sources are divided into groups 5. In each group, the angle between the direction of one and the direction of the next must be constant. In order to make easier the comprehension and the measurement of the angles of these directions, we will speak here of the projections of the central axes 6 of the emission lobes on the plane 2 which carries the light sources 1. The direction 7 of each of these projections makes with the following direction a certain angle. Here, we speak of the following direction or of the following source because the light sources of each group 5 are assigned a predetermined rank in a series of consecutive elements, each source constituting one of these elements.

For the evening compensation performed on the entire target area, it is necessary to have at least four sources. Thus, FIG. 2 shows groups 5 each comprising four light sources 1, these four sources are numbered respectively 1a, 1b, 1c and 1d.

The direction 7 of the projection of the central axis 6 of the lobe of the source is with the direction 7 of the next source 1b of the series at an angle of 90 °. Similarly, the direction of the source 1b is at an angle of 90 ° with that of the next source 1c, the direction of the source 1c is at an angle of 90 ° with that of the source 1d, and the direction of the source 1d a angle of 90 ° with that of the source 1a, first in the series.

It is noted that the sum of the angles is equal to 360 °, which is essential if one wants to obtain a uniformly lit field.

A configuration of more than four sources per group, for example six sources, each of which has a direction 7 which deviates 60 ° from the direction of the next source, is also possible. However, it has the disadvantage of expanding the base from which compensation is made.

This disadvantage is obviously even more marked in the embodiment shown in FIG. 5, in which the light sources are 8 in number, the angle between the direction of each source with the direction of the next source being 45 °.

Groups 5 of four or more sources can theoretically be) multiplied to infinity, FIG. 2 thus shows a set of four groups 5 of four light sources 1 each.

[0020] Preferably, in the device comprising groups of four sources each, which is the preferred embodiment of the invention, the groups are distributed in a grid grid 8, as shown in FIGS. 2 and 6.

It is also possible to use grids having a mesh of another form, for example a honeycomb grid. It is also possible to superimpose two different grids, or more than two grids. Finally, it is possible to arrange groups arranged in a grid, for example groups of four sources arranged in a square, the groups being placed in a non-grid grid, for example in honeycomb. In this case, each group is placed at the corner of a hexagon.

For the compensation to work, it is necessary that the sources incorporated in the same group have substantially the same defects. It is therefore necessary in practice that the sources inserted in the same group come from the same batch of manufacture. This does not prevent the same illuminator from being composed of light sources from different batches, provided that the sources of the same group belong to the same batch.

Figs. 3 and 4 show how compensation works. The actual transmission lobes 3 each emanate from a source oriented at 180 ° to the other, this is for example the case of the sources 1a and 1a in FIGS. 2 and 6. These two sources are placed in front of one another. The central axes 6 of the real lobes 3 deviate symmetrically from the theoretical axis 4 which is perpendicular to the plane 2 which carries the source 1. The resulting emission lobe 9, shown in bold lines, is wider than the lobe Theoretical 10 shown in dashed lines in FIG. 1, but its axis of symmetry merges with the theoretical axis 4.

In the case shown in FIG. 4, the individual lobes 3 are widely spaced from each other, so that the resulting lobe has a central depression. However, this does not affect the symmetry and the perpendicularity of the resulting lobe, which are determining factors for the uniformity of the whole.

The first application of the device according to the invention is the measurement of modules and photovoltaic cells, for which it is important that the illumination on the entire surface is as constant as possible, the accuracy of the measurement of characteristics these modules or cells being directly influenced by this more or less constant.

As indicated above, the device of the invention can also be used in photography. In the latter area, it is also important that the illumination be constant so that the reproduction, especially of documents or plans of all kinds, is as faithful as possible.

A third area of application is the detection of objects by a camera system, the uniformity of the illuminated field improving the location of the object by avoiding ambiguities.

Claims (7)

1. Lighting device, comprising several light sources (1) placed on the same plane (2) and able to send light rays in a direction not parallel to said plane, characterized in that each light source has a transmission lobe a luminous device (3) which is not symmetrical with respect to the axis (4) passing through the center of said light source perpendicular to the plane (2), and in that said light sources are arranged in groups (5), each light source of the same group being placed in such a way that the central axis (6) of its light emission lobe (3) is oriented in a direction different from that of the central axes of the light emission lobes of the other light sources from the same group.
2. Device according to claim 1, characterized in that the angles formed by the projections (7) of the central axes (6) of the emission lobes of the light sources of the same group on the plane (2) and forming a series consecutive sources are equal and have a sum of 360 °.
3. Device according to claim 2, characterized in that it comprises at least one group (5) comprising at least four light sources each of which is placed at one of the vertices of a rectangle quadrilateral.
4. Device according to one of claims 1 to 2, characterized in that it comprises at least one group (5) comprising six light sources each of which is placed at one of the vertices of a hexagon.
5. Device according to claim 4, characterized in that the hexagon is regular.
6. Device according to claim 3, characterized in that it comprises several groups (5) arranged in a grid (8) grid.
7. Device according to claim 5, characterized in that it comprises several groups (5) arranged in a grid (8) honeycomb.
CH01442/09A 2009-09-17 2009-09-17 A lighting device for obtaining a uniformly illuminated field. CH701854A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH01442/09A CH701854A1 (en) 2009-09-17 2009-09-17 A lighting device for obtaining a uniformly illuminated field.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01442/09A CH701854A1 (en) 2009-09-17 2009-09-17 A lighting device for obtaining a uniformly illuminated field.
PCT/CH2010/000221 WO2011032300A1 (en) 2009-09-17 2010-09-15 Lighting device for obtaining a uniformly illuminated field

Publications (1)

Publication Number Publication Date
CH701854A1 true CH701854A1 (en) 2011-03-31

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ID=43304178

Family Applications (1)

Application Number Title Priority Date Filing Date
CH01442/09A CH701854A1 (en) 2009-09-17 2009-09-17 A lighting device for obtaining a uniformly illuminated field.

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WO (1) WO2011032300A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3298321A1 (en) * 2015-05-18 2018-03-28 Terabee S.A.S. Device and method for uniform far-field illumination with leds

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EP1568938A1 (en) * 2004-02-28 2005-08-31 TRUMPF Kreuzer Medizin Systeme GmbH &amp; Co. KG Surgical lamp and method of illumination of an operating theatre
US7071476B2 (en) * 1998-05-05 2006-07-04 Carl Zeiss Smt Ag Illumination system with a plurality of light sources
US20060245189A1 (en) * 2005-04-19 2006-11-02 Musco Corporation Method, apparatus, and system of aiming lighting fixtures
WO2008061767A1 (en) * 2006-11-24 2008-05-29 Karl Leibinger Medizintechnik Gmbh & Co. Kg Lighting unit for operations or examinations

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DE102006002275A1 (en) * 2005-01-19 2006-07-20 Osram Opto Semiconductors Gmbh Lighting device
DE102005042066A1 (en) * 2005-09-03 2007-03-15 Osram Opto Semiconductors Gmbh Backlight arrangement with arranged in lighting groups semiconductor light sources
TWI352862B (en) * 2006-06-16 2011-11-21 Au Optronics Corp Light source
WO2008010130A2 (en) * 2006-07-18 2008-01-24 Koninklijke Philips Electronics N.V. Composite light source
CN101627253B (en) * 2006-11-27 2011-05-18 飞利浦固体状态照明技术公司 Methods and apparatus for providing uniform projection lighting
US8360601B2 (en) * 2007-03-09 2013-01-29 Osram Opto Semiconductors Gmbh LED module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7071476B2 (en) * 1998-05-05 2006-07-04 Carl Zeiss Smt Ag Illumination system with a plurality of light sources
DE10034594A1 (en) * 2000-07-14 2002-01-31 Sirona Dental Systems Gmbh Dental treatment lamp has LEDs producing first part of light cone giving first light field fully within second light field produced by second part of light cone
EP1568938A1 (en) * 2004-02-28 2005-08-31 TRUMPF Kreuzer Medizin Systeme GmbH &amp; Co. KG Surgical lamp and method of illumination of an operating theatre
US20060245189A1 (en) * 2005-04-19 2006-11-02 Musco Corporation Method, apparatus, and system of aiming lighting fixtures
WO2008061767A1 (en) * 2006-11-24 2008-05-29 Karl Leibinger Medizintechnik Gmbh & Co. Kg Lighting unit for operations or examinations

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