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EP2271872A1 - Unité d'éclairage - Google Patents

Unité d'éclairage

Info

Publication number
EP2271872A1
EP2271872A1 EP09734593A EP09734593A EP2271872A1 EP 2271872 A1 EP2271872 A1 EP 2271872A1 EP 09734593 A EP09734593 A EP 09734593A EP 09734593 A EP09734593 A EP 09734593A EP 2271872 A1 EP2271872 A1 EP 2271872A1
Authority
EP
European Patent Office
Prior art keywords
radiation
lighting unit
partially
light source
space
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09734593A
Other languages
German (de)
English (en)
Inventor
Jörg Erich SORG
Stefan Gruber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP2271872A1 publication Critical patent/EP2271872A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0004—Personal or domestic articles
    • F21V33/0052—Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-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
    • F21K2/00—Non-electric light sources using luminescence; Light sources using electrochemiluminescence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-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
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69—Details of refractors forming part of 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • 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
    • F21Y2101/00—Point-like light sources
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials

Definitions

  • a lighting unit is specified, which is particularly suitable for use in an optical recording device.
  • the mobile phone may have a flashlight, which is arranged next to a camera lens.
  • a mirror for self-portraits can be provided in addition to the flash and the camera lens.
  • a corresponding mobile telephone is shown in FIG. Such
  • Mobile phone has a special component for each function.
  • the flashlight may, for example, comprise a radiation-generating semiconductor chip with a converter which converts the generated radiation at least partially into radiation of a longer wavelength.
  • a radiation-generating semiconductor chip with a converter which converts the generated radiation at least partially into radiation of a longer wavelength.
  • the various components are recognizable to an observer.
  • a problem to be solved is to specify a lighting unit whose components are not recognizable in detail. This object is achieved by a lighting unit according to claim 1.
  • the lighting unit has a light source for generating radiation and a partially reflecting element arranged downstream of the light source in a main emission direction, which subdivides a space into a first half space facing the light source and a second half space facing away from the light source, wherein the partially reflecting element the radiation coming from the first half-space from the light source is partially transmitted and the outer radiation coming from an opposite direction from the second half-space is partially reflected.
  • the transmitted radiation illuminates the second half space.
  • the partially reflecting element is a partially transmissive mirror.
  • the partially transmissive mirror may be a coating containing a metal or metal compound or consisting of a metal or metal compound.
  • the partially transmissive mirror may be a dichroic mirror. The reflected external radiation can be collimated by means of the partially transmissive mirror, so that an object located in the second half-space is imaged by the partially transmissive mirror.
  • the partially reflecting element is designed such that an object located in the second half-space is not imaged.
  • points the partially reflecting element according to the second variant has a facet structure.
  • an object facing the object located in the second half-space surface of the partially reflecting element is formed with a plurality of optical structure elements.
  • the optical structural elements may be, for example, concave or convex-shaped lenses.
  • the partially reflecting element advantageously has a regular arrangement of a plurality of optical structural elements.
  • the view of the light source can be blocked for an observer in the second half space with advantage.
  • the external appearance of the light source can be hidden or masked.
  • the lighting unit has a beam-shaping optical element with a radiation entrance surface and a radiation exit surface.
  • the radiation entrance surface is disposed on a side of the beam-shaping optical element facing the light source, while the radiation entrance surface is arranged
  • Radiation exit surface is located on a side facing away from the light source.
  • the radiation exit surface of the beam-shaping optical element can be convexly curved.
  • Radiation exit surface can cause a collimation of the emitted light from the light source in different directions radiation.
  • a radiation characteristic can be achieved, which allows a homogeneous illumination of a given limited field in the second half space.
  • the boundaries of the field are especially where the radiation intensity drops to a value that is less than 50% of an average value assumed by the radiation intensity within the field.
  • Homogeneous illumination is preferably given when the deviation from the mean radiation intensity within the limited field is not more than 20%.
  • the beam-shaping optical element is arranged between the light source and the partially reflecting element.
  • the partially reflecting element can be arranged on the radiation exit surface of the beam-shaping optical element.
  • the radiation emitted by the light source initially interacts with the beam-shaping optical element before impinging on the partially reflective element.
  • the partially reflecting element may have a curvature corresponding to the radiation exit surface. Furthermore, the partially reflecting element may have a planar shape if the radiation exit surface is planar.
  • the semitransparent mirror can be curved convexly, concavely arched or flat.
  • a convex-curved semitransparent mirror is particularly useful for recording a self-portrait suitable.
  • the light source can be masked by means of the partially transparent mirror, but also an object located in the second half-space can be reflected and imaged.
  • the optical structure elements can be arranged along the curved or planar radiation exit surface, so that the partially reflecting element is also one of the
  • Radiation exit surface corresponding vault 'or has a planar shape.
  • the arrangement of optical structure elements which is in particular a lens arrangement, may be formed integrally with the optical element.
  • the partially reflecting element is formed as a separate element and is arranged downstream of the beam-shaping optical element in the main emission direction.
  • the optical element on the radiation entrance side as a convex or concave lens, Fresnel lens, TIR (Total Internal Reflection) - lens or as an array of single lenses, which may be arranged irregularly formed. This improves the optical element on the radiation entrance side.
  • the partially reflecting element can be arranged on the radiation inlet surface of the beam-shaping optical element. Consequently, in this variant, the radiation emitted by the light source strikes the partially reflecting element before interacting with the beam-shaping optical element.
  • the embodiment in which the partially reflective element is applied to the radiation exit surface and the embodiment in which the partially reflective element is applied to the radiation entrance surface have various advantages.
  • the partially reflecting element preferably directly adjoins the surroundings, that is to say the partially reflecting element is uncovered and therefore has a substantially unimpeded reflectivity.
  • the partially reflective element is covered by the beam-shaping optical element. Although this can reduce the reflectivity. However, this protects the partially reflecting element from the environment, which counteracts a reduction in the reflectivity due to environmental influences, for example by scratches on the surface.
  • the partially transmissive mirror is one on the radiation entrance surface of the beam-forming optical
  • the partially transmissive mirror can assume the shape of the radiation entrance surface. Accordingly, the partially reflecting element provided with a facet structure can be mounted on the
  • Radiation entrance surface are arranged and in this way assume the shape of the radiation entrance surface.
  • a concavely curved radiation entrance surface is particularly advantageous. Because this can be achieved for a reflecting object in the second half space, the mirror effect of a convex mirror, which is particularly suitable for use in an optical recording device such as a mobile phone with integrated camera.
  • the radiation exit surface may be convex in this variant convex or flat.
  • the planar design has the advantage, when using the lighting unit in an optical recording device, that the surface of the lighting unit is flush with the outer wall of the recording apparatus.
  • a refractive index-adapting material is arranged between the light source and the radiation entrance surface, which in particular has a refractive index which is between the refractive index of the refractive index
  • the partially transmissive mirror is partially reflecting in a wide wavelength range.
  • Suitable materials are here in particular metals or metal compounds.
  • the partially transmissive mirror may contain or consist of Ag or Au.
  • the partially transmissive mirror may contain or consist of a metal oxide, in particular aluminum oxide or titanium oxide. Decisive influence on the partial transmission has in this embodiment, the layer thickness, which is preferably lnm to 20nm.
  • the partially transmissive mirror may be partially reflective in a limited wavelength range.
  • a dichroic mirror is advantageously used. This has a sequence of dielectric layers with alternately different refractive indices.
  • a dichroic mirror may be used if the light source has visible colorations that an observer would find disturbing upon direct viewing of the light source, but which can be hidden by a suitable dichroic mirror.
  • that color component in the external radiation can be attenuated by reflection, which gives the color its special color, so that the color is no longer visible to the observer.
  • the reflectivity of the partially transparent mirror is preferably in a range between 5% and 80%.
  • the light source has a radiation-emitting semiconductor chip.
  • the semiconductor chip may in particular be made of materials based on nitride compound semiconductors, which in the present context means that an active epitaxial layer sequence from which the semiconductor chip is formed, or at least one layer of which is a nitride
  • Ill / V compound semiconductor material preferably
  • the light source emits mixed-color total radiation.
  • the semiconductor chip can emit blue light, which is partially converted into yellow light by means of the conversion element, so that the light source emits white light.
  • the light source when the light source is switched off directly by the conversion element, a yellow color impression is created by an observer.
  • the light source thus has a yellow coloration for the observer.
  • the coloring can advantageously be masked by means of the partially reflecting element.
  • the light source is a flashlight, that is, the light source is as a
  • Lighting device is formed which generates a flash of light when taking an object in the second half-space, which provides the necessary illumination of the object.
  • the flashlight may comprise, for example, a radiation-emitting semiconductor chip of the type described above or one
  • Gas discharge lamp for example a xenon lamp. It should be noted that the light source can emit electromagnetic radiation in the visible, near infrared or ultraviolet spectral range.
  • a lighting unit with a light source that emits radiation in the infrared spectral range can be used to advantage for an autofocus device in a mobile phone.
  • an optical recording device in particular a mobile phone with integrated camera, a lighting unit of the type mentioned above and a camera lens.
  • the partially reflecting element is a partially transmissive mirror
  • the lighting unit is arranged next to the camera lens such that an object reflected in the partially reflecting mirror is located in the receiving area of the camera lens.
  • the optical recording apparatus may be, for example, a camera.
  • FIG. 1 shows a schematic perspective illustration of a section from a first exemplary embodiment of a lighting unit
  • FIG. 2 is a schematic perspective view of a detail of a second exemplary embodiment of a lighting unit
  • FIG. 3 shows a schematic perspective view of a lighting unit according to the first or second exemplary embodiment
  • FIG. 4 is a schematic cross-sectional view of a portion of an embodiment of an optical recording apparatus
  • FIG. 5 shows a schematic illustration of a top view of the embodiment of an optical recording device shown in FIG. 4,
  • Figure 6 is a schematic representation of a plan view of a conventional mobile phone.
  • the partially reflective element described is a partially transmissive mirror, however, the partially transmissive mirror may also be replaced by a partially reflective element having a facet structure as described above.
  • Figure 1 shows a first embodiment of a lighting unit 1 with a light source 2 and a partially transparent mirror 3, which is the light source 2 in a Haupabstrahlraum H downstream.
  • the partially transparent mirror 3 divides a room into one of Light source 2 facing half-space (not marked in Figure 1) and in a light source 2 remote from the half-space (not marked in Figure 1).
  • a beam-shaping optical element 4 is arranged, with which the radiation generated by the light source 2 interacts before it impinges on the partially transmissive mirror 3.
  • the partially transmissive mirror 3 is applied in the form of a coating to a radiation exit surface 4 a of the beam-shaping optical element 4.
  • Mirror 3 which may consist of a metal layer, a metal oxide layer or a sequence of alternating refractive index dielectric layers.
  • coating can be applied to the
  • Radiation exit surface 4a are vapor-deposited or sputtered.
  • the radiation exit surface 4a is convexly curved, which is preferably a collimation of the passing
  • the radiation entrance surface 4b facing the radiation exit surface 4a may be concavely curved. This improves the radiation coupling into the beam-shaping optical element 4.
  • the beam-shaping optical element 4 has, on a side facing the light source 2, a spacer 4c whose height is selected such that the light source 2 has a suitable distance from the beam-shaping optical element 4.
  • the spacer 4c serves as
  • spacer 4c is inserted into a carrier 5, so that the spacer 4c is seated on planar support surfaces 5a and 5b of the carrier 5 and disposed within side surfaces 6a and 6b of the carrier 5, which from the Level of the support surfaces 5a and 5b are bent out.
  • the carrier 5 has a first sub-carrier with the carrier surface 5a and the at least one side surface 6a and a second sub-carrier with the carrier surface 5b and the at least one side surface 6b. Between the two sub-carriers, a gap 7 is present. The two sub-carriers are held together by an insert 8 in the carrier 5.
  • the two sub-carriers are formed from an electrically conductive material, so that a first electrical contact is formed by the first sub-carrier and a second electrical contact of the light source 2 is formed by the second sub-carrier.
  • the insert 8 advantageously contains an electrically insulating material, so that the first subcarrier is electrically insulated from the second subcarrier.
  • the light source 2 has a radiation-emitting semiconductor chip and a semiconductor chip arranged on the
  • the semiconductor chip emits radiation in the short-wavelength visible spectral range, such as blue light. Furthermore, that can Conversion element to convert part of the radiation into yellow light, so that the lighting unit emits white light in total.
  • Chip surface which are caused by the conversion element, are masked by the partially transmissive mirror 3, so that an observer in the second half space does not perceive these stains.
  • the partially transmissive mirror 3 does not prevent radiation portions of the blue and yellow light from the light source 2 from entering the second half space.
  • the second half-space can be illuminated by the mixed-color total radiation.
  • the beam-shaping optical element 4 By means of the beam-shaping optical element 4, a radiation characteristic can be achieved, which is particularly suitable for illuminating a limited field.
  • the limited field may be the face of an observer in the second half space.
  • the light source 2 is advantageously a flash, which illuminates the face of the observer sufficiently.
  • the partially transparent mirror 3 makes it easier for the observer to record a self-portrait. If the observer sees his reflection in the mirror, he is in the area of a camera lens and can be sure that a corresponding image will be photographed.
  • the lighting unit 1 is constructed to save space by the integrated light source 2 and the integrated mirror 3.
  • the illustrated in Figure 2 second embodiment of a lighting unit 1 is similar in construction as the first embodiment.
  • the beam-shaping optical element 4 is fastened to the carrier 5 by means of the spacer 4c inserted into the carrier 5.
  • the light source 2 is arranged on the carrier 5 and is located in an opening of the insert 8 provided for the light source 2.
  • the partially transparent mirror 3 is not subordinate to the beam-shaping optical element 4 in the main emission H, but is located in the main emission H in front of the beam-shaping optical element 4.
  • the partially transmissive mirror 3 is applied to the radiation entrance surface 4b of the beam-forming optical element 4. This arrangement has the advantage that the partially transparent mirror 3 is protected against reflection-reducing effects from the environment such as scratches.
  • the radiation entrance surface 4b is concavely curved so that the same mirror effect as in the first embodiment is produced for the external radiation impinging on the partially transparent mirror 3 from the second half space, namely the mirror effect of a convex mirror.
  • a refractive index adjusting material (not marked in FIG. 2) is arranged. In particular, that fills Refractive index adapting material from the cavity between the beam-shaping optical element 4 and the carrier 5 from.
  • FIG. 3 shows how the lighting unit 1 according to the first or second exemplary embodiment can look from the outside.
  • the beam-shaping optical element 4, as shown, form a housing cover and the carrier 5 form a housing bottom of the lighting unit 1.
  • the spacer 4c serves as a side wall surrounding the light source 2 on all four sides.
  • the spacer 4c can have indentations on all four sides, in which the side surfaces 6a, 6b engage.
  • the arrangement described advantageously prevents slippage of the beam-shaping optical element 4 relative to the carrier 5.
  • FIG. 4 shows a detail of an optical recording device with a lighting unit 1 of the type described above.
  • the optical recording device has a first wall 10 and a second wall 11, wherein in the first wall 10, a recess 9 is provided for the lighting unit 1.
  • the lighting unit 1 is arranged so that the beam-shaping optical element 4 projects into the recess 9.
  • the recess may be formed as a reflector, i. the at least one side wall facing the beam-shaping optical element 4, which delimits the recess, has a comparatively high reflectivity.
  • contact means 12 which are preferably spring elements.
  • the spring elements have the advantage that for different distances between the first and the second wall 10, 11, the same contact means 12 can be used.
  • the contact means 12 have a small diameter, a relatively low heat removal takes place by the contact means 12. Additional cooling can advantageously take place via the thermally conductive side surfaces 6a, 6b.
  • FIG. 5 shows an optical recording device 13 which may be constructed as shown in FIG.
  • the optical recording device 13 is a mobile phone.
  • a camera lens 14 is provided in addition to the light unit 1.
  • the light unit 1 with integrated light source and integrated semitransparent mirror meets two
  • an object / subject which is located in front of the camera lens 14 and is to be scanned, can be sufficiently illuminated by the lighting unit 1, which in particular has a flashlight.
  • the subject can correctly position himself to take a self-portrait by means of the lighting unit 1.
  • FIG. 6 shows a conventional mobile telephone 13 which, on the other hand, provides separate elements for the two functions, a light source 2 and a mirror 15.
  • the lighting unit 1 is relatively space-saving.
  • the partially transmissive mirror contained in the lighting unit 1 masks the Light source, so that any disturbing colorations of the light source are covered.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electromagnetism (AREA)
  • Stroboscope Apparatuses (AREA)
  • Lenses (AREA)
  • Microscoopes, Condenser (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente demande décrit une unité d'éclairage (1) pour un appareil d'enregistrement optique (13), comprenant une source lumineuse (2) destinée à produire un rayonnement et un élément monté en aval de la source lumineuse (2) dans la direction principale du rayonnement (H) et partiellement réfléchissant, qui divise un espace en un premier demi-espace tourné vers la source lumineuse (2) et un deuxième demi-espace opposé à la source lumineuse (2), où l'élément partiellement réfléchissant laisse passer au moins partiellement le rayonnement provenant de la source lumineuse (2) et issu du premier demi-espace et réfléchit au moins partiellement le rayonnement extérieur provenant d'une direction opposée et issu du deuxième demi-espace.
EP09734593A 2008-04-25 2009-04-16 Unité d'éclairage Withdrawn EP2271872A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810020817 DE102008020817A1 (de) 2008-04-25 2008-04-25 Leuchteinheit
PCT/DE2009/000522 WO2009129784A1 (fr) 2008-04-25 2009-04-16 Unité d'éclairage

Publications (1)

Publication Number Publication Date
EP2271872A1 true EP2271872A1 (fr) 2011-01-12

Family

ID=40821743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09734593A Withdrawn EP2271872A1 (fr) 2008-04-25 2009-04-16 Unité d'éclairage

Country Status (6)

Country Link
US (1) US8731392B2 (fr)
EP (1) EP2271872A1 (fr)
KR (2) KR20110006649A (fr)
CN (2) CN101965479A (fr)
DE (1) DE102008020817A1 (fr)
WO (1) WO2009129784A1 (fr)

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DE102008020817A1 (de) 2009-10-29
US8731392B2 (en) 2014-05-20
CN106090846A (zh) 2016-11-09
KR20110006649A (ko) 2011-01-20
WO2009129784A1 (fr) 2009-10-29
US20110188846A1 (en) 2011-08-04
CN101965479A (zh) 2011-02-02
KR20170018106A (ko) 2017-02-15

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