DE102020131971A1 - Illumination with beam expansion - Google Patents

Illumination with beam expansion Download PDF

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Publication number
DE102020131971A1
DE102020131971A1 DE102020131971.1A DE102020131971A DE102020131971A1 DE 102020131971 A1 DE102020131971 A1 DE 102020131971A1 DE 102020131971 A DE102020131971 A DE 102020131971A DE 102020131971 A1 DE102020131971 A1 DE 102020131971A1
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DE
Germany
Prior art keywords
diffuser
illumination
light
light source
diffusers
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Withdrawn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
DE102020131971.1A
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German (de)
Inventor
Thomas Dietz
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.)
IFM Electronic GmbH
PMDtechnologies AG
Original Assignee
IFM Electronic GmbH
PMDtechnologies AG
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 IFM Electronic GmbH, PMDtechnologies AG filed Critical IFM Electronic GmbH
Priority to DE102020131971.1A priority Critical patent/DE102020131971A1/en
Publication of DE102020131971A1 publication Critical patent/DE102020131971A1/en
Withdrawn legal-status Critical Current

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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • 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
    • F21Y2115/30—Semiconductor lasers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Beleuchtung mit einer Lichtquelle und einem ersten und zweiten Diffusor,wobei der erste Diffusor in der Nähe der Lichtquelle angeordnet ist und das aus dem ersten Diffusor austretende Licht den zweiten Diffusor beleuchtet,wobei der erste und zweite Diffusor derart ausgebildet und beabstandet sind,dass die Lichtaustrittsfläche des zweiten Diffusors größer ist als die Lichtaustrittsfläche des ersten Diffusors.Illumination with a light source and a first and second diffuser,wherein the first diffuser is arranged in the vicinity of the light source and the light emerging from the first diffuser illuminates the second diffuser,wherein the first and second diffusers are designed and spaced such that the light exit surface of the second diffuser is larger than the light exit surface of the first diffuser.

Description

Typischerweise werden VCSEL nur mit dem durch das Bauelement vorgegebenen Öffnungswinkel betrieben. Dies führt bei einer vorgenommenen Vergrößerung der Abstrahlfläche zu signifikant erhöhtem Bauraumbedarf und gefalteten Optiken mit komplizierten Spiegelarrays.Typically, VCSELs are only operated with the opening angle specified by the component. If the radiating surface is enlarged, this leads to a significantly increased installation space requirement and folded optics with complicated mirror arrays.

Kerngedanke der Erfindung ist es eine Möglichkeit zur optischen Quellenvergrößerung zu schaffen, die im Rahmen des augensicheren Betriebs von Laserprodukten gemäß des internationalen Standards IEC 60825-1 bleibt.The core idea of the invention is to create a possibility for optical source enlargement that remains within the scope of the eye-safe operation of laser products in accordance with the international standard IEC 60825-1.

Um die Augensicherheit zu gewährleisten, darf die optische Quellengröße, definiert als der Winkel, der vom Betrachtungspunkt aus vom strahlenden Objekt überstrichen wird, einen bestimmten Grenzwert nicht unterschreiten. Dieser Grenzwert hängt von der Beleuchtungsdauer sowie der emittierten optischen Leistung ab. Dabei besteht die Abhängigkeit, dass je größer die Quellengröße ist, desto größer auch optische Leistung und / oder die Beleuchtungsdauer sein darf. Eine größere optische Leistung kann von Interesse sein, um ein besseres Signal- zu Rauschverhältnis zu erhalten. Folglich ist es von Interesse die optische Quelle zu vergrößern. Die Beleuchtungseinheit besteht aus einer Laserdiode und einem Diffusor. Als Referenzpunkt zur Bestimmung der Quellengröße darf bei vollständig diffusem Licht die Oberfläche des Diffusors herangezogen werden, sodass die Quellengröße durch die beleuchtete Fläche des Diffusors bestimmt wird.To ensure eye safety, the optical source size, defined as the angle swept by the radiating object from the viewing point, must not fall below a certain limit. This limit value depends on the lighting duration and the emitted optical power. There is the dependency that the larger the source size, the greater the optical power and/or the lighting duration may be. Greater optical power may be of interest to get better signal-to-noise ratio. Consequently, it is of interest to increase the size of the optical source. The lighting unit consists of a laser diode and a diffuser. The surface of the diffuser may be used as a reference point for determining the source size in the case of completely diffuse light, so that the source size is determined by the illuminated area of the diffuser.

Die erfindungsgemäße Lösung besteht darin, die beleuchtete Fläche des Diffusors durch die Verwendung eines zweiten Diffusors zu vergrößern. Die Winkelverteilung des resultierenden Sichtfelds ergibt sich aus der Faltung der beiden Winkelverteilungen der einzelnen Diffusoren, sodass bei einem bestimmten zu erzielenden Sichtfeld die beiden Diffusoren genau aufeinander abgestimmt werden müssen. Als Variation dieser Methode kann anstelle des zusätzlichen Diffusors alternativ auch eine andere Optik wie beispielsweise ein Mikrolinsenarray oder einen Mikroprismenarray benutzt werden. Die Optik, die zur Quellenvergrößerung eingesetzt wird, kann dabei direkt auf der Lichtquelle oder zwischen Lichtquelle und zweitem Optikelement angebracht sein.The solution according to the invention consists in increasing the illuminated area of the diffuser by using a second diffuser. The angular distribution of the resulting field of view results from the convolution of the two angular distributions of the individual diffusers, so that the two diffusers must be precisely matched to one another for a specific field of view to be achieved. As a variation of this method, other optics such as a microlens array or a microprism array can alternatively be used instead of the additional diffuser. The optics used to enlarge the source can be attached directly to the light source or between the light source and the second optics element.

Claims (3)

Beleuchtung mit einer Lichtquelle und einem ersten und zweiten Diffusor, wobei der erste Diffusor in der Nähe der Lichtquelle angeordnet ist und das aus dem ersten Diffusor austretende Licht den zweiten Diffusor beleuchtet, wobei der erste und zweite Diffusor derart ausgebildet und beabstandet sind, dass die Lichtaustrittsfläche des zweiten Diffusors größer ist als die Lichtaustrittsfläche des ersten Diffusors.Illumination with a light source and a first and second diffuser, the first diffuser being arranged in the vicinity of the light source and the light emerging from the first diffuser illuminating the second diffuser, the first and second diffusers being designed and spaced such that the light exit surface of the second diffuser is larger than the light exit surface of the first diffuser. Beleuchtung nach Anspruch 1, bei dem der erste und zweite Diffusor derart angeordnet sind, dass der erste Diffusor wenigsten 50 % des zweiten Diffusors beleuchtet.lighting after claim 1 wherein the first and second diffusers are arranged such that the first diffuser illuminates at least 50% of the second diffuser. Beleuchtung nach Anspruch 1 oder 2, bei der der erste Diffusor als Mikrolinsen- / -prismenarray ausgebildet ist.lighting after claim 1 or 2 , in which the first diffuser is designed as a microlens/prism array.
DE102020131971.1A 2020-12-02 2020-12-02 Illumination with beam expansion Withdrawn DE102020131971A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102020131971.1A DE102020131971A1 (en) 2020-12-02 2020-12-02 Illumination with beam expansion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020131971.1A DE102020131971A1 (en) 2020-12-02 2020-12-02 Illumination with beam expansion

Publications (1)

Publication Number Publication Date
DE102020131971A1 true DE102020131971A1 (en) 2022-06-02

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DE102020131971.1A Withdrawn DE102020131971A1 (en) 2020-12-02 2020-12-02 Illumination with beam expansion

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200192106A1 (en) 2018-12-12 2020-06-18 Continental Automotive Systems, Inc. Laser system with increased laser energy while maintaining low laser classification
US10823365B2 (en) 2018-12-23 2020-11-03 Ii-Vi Delaware Inc. Optical apparatus for wide-angle illumination

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200192106A1 (en) 2018-12-12 2020-06-18 Continental Automotive Systems, Inc. Laser system with increased laser energy while maintaining low laser classification
US10823365B2 (en) 2018-12-23 2020-11-03 Ii-Vi Delaware Inc. Optical apparatus for wide-angle illumination

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Representative=s name: SCHUHMANN, JOERG, DIPL.-PHYS. DR. RER. NAT., DE

R163 Identified publications notified
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee