DE10261974A1 - Plastic lens and method for producing a plastic lens - Google Patents

Plastic lens and method for producing a plastic lens Download PDF

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Publication number
DE10261974A1
DE10261974A1 DE10261974A DE10261974A DE10261974A1 DE 10261974 A1 DE10261974 A1 DE 10261974A1 DE 10261974 A DE10261974 A DE 10261974A DE 10261974 A DE10261974 A DE 10261974A DE 10261974 A1 DE10261974 A1 DE 10261974A1
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DE
Germany
Prior art keywords
lens
plastic
plastic material
abbe number
converging lens
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.)
Ceased
Application number
DE10261974A
Other languages
German (de)
Inventor
Christian Boehlau
Michael Burg
Martin Mühlenberg
Jens Kaphingst
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Priority to DE10220671A priority Critical patent/DE10220671B4/en
Priority claimed from DE10220671A external-priority patent/DE10220671B4/en
Publication of DE10261974A1 publication Critical patent/DE10261974A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00403—Producing compound lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

Es wird eine Kunststofflinse, bestehend aus einer Sammellinse (1A), aus einem Kunststoffmaterial mit einer hohen Abbezahl und einer damit einstückig und formschlüssig verbundenen Zerstreuungslinse (1B) aus einem Kunststoffmaterial mit einer im Vergleich zum Kunststoffmaterial der Sammellinse niedrigeren Abbezahl beschrieben, wobei die thermischen Ausdehnungskoeffizienten der Kunststoffmaterialien im wesentlichen gleich sind.A plastic lens is described, consisting of a converging lens (1A), made of a plastic material with a high Abbe number and a diverging lens (1B) integrally and positively connected therewith, made of a plastic material with a lower Abbe number compared to the plastic material of the converging lens, the thermal expansion coefficients the plastic materials are essentially the same.

Description

Die Erfindung bezieht sich auf eine Kunststofflinse sowie Verfahren zur Herstellung einer Kunststofflinse.The invention relates to a Plastic lens and method for producing a plastic lens.

Aus der EP 692 05 806 T2 ist eine Kunststofflinse bestehend aus zwei Komponenten bekannt, wobei auf einen ersten Linsenrohling eine zweite Kunststoffvorderfläche gegossen wird. Beide Komponenten stellen jeweils für sich und im Linsenverbund eine Sammellinse dar.From the EP 692 05 806 T2 a plastic lens consisting of two components is known, a second plastic front surface being cast onto a first lens blank. Both components represent a converging lens for themselves and in the lens system.

Eine Korrektur des chromatischen Linsenfehlers ist dabei nicht möglich.A correction of the chromatic Lens error is not possible.

Aufgabe der Erfindung ist es, eine Kunststofflinse ohne chromatischen Fehler zu schaffen.The object of the invention is a To create plastic lens without chromatic error.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im Zweikomponenten-Spritzgießverfahren eine Sammellinse aus einem Kunststoffmaterial mit einer hohen Abbezahl und eine damit einstöckig und formschlüssig verbundene Zerstreuungslinse aus einem Kunststoffmaterial mit einer im Vergleich zum Kunststoffmaterial der Sammellinse niedrigeren Abbezahl hergestellt wird, wobei die thermischen Ausdehnungskoeffizienten der Kunststoffmaterialien im wesentlichen gleich sind, wodurch der Formschluß zwischen den beiden Linsen auch bei Temperaturschwankungen erhalten bleibt und es nicht zu Verspannungen innerhalb der Linse kommt. Materialkombinationen, die diese Voraussetzungen erfüllen, sind beispielsweise PMMA, PMMA-Copolymerisat oder COC als Material für die Sammellinse und PC als Material für die Zerstreuungslinse.This object is achieved according to the invention solved, that in Two-component injection molding a converging lens made of a plastic material with a high Abbe number and one-story with it and form-fitting connected diverging lens made of a plastic material with a lower compared to the plastic material of the converging lens Abbe number is produced, the thermal expansion coefficient the plastic materials are substantially the same, whereby the positive connection between the two lenses are retained even with temperature fluctuations and there is no tension within the lens. Material combinations, who meet these requirements are, for example, PMMA, PMMA copolymer or COC as the material for the Collecting lens and PC as material for the diverging lens.

Anhand der beiden Zeichnungen soll die Erfindung nachfolgend näher erläutert werden.Based on the two drawings the invention in more detail below explained become.

1 zeigt einen Tubus (2) mit einer achromatischen Kunststofflinse (1), welche aus einer Sammellinse (1A) und einer Zerstreuungslinse (1B) besteht. Beide Linsen (1A, 1B) werden ohne einen dazwischen liegenden Luftspalt im Zweikomponenten-Spritzgießverfahren einstöckig hergestellt und formschlüssig miteinander verbunden werden. Dabei wird für die Sammellinse (1A) ein Kunststoffmaterial mit einer hohen Abbezahl verwendet, während für die Zerstreuungslinse (1B) ein Kunststoffmaterial mit einer im Vergleich zum Kunststoffmaterial der Sammellinse niedrigeren Abbezahl verwendet wird. Damit dies funktioniert, müssen die Materialien von Sammellinse und Zerstreuungslinse zwar unterschiedliche Abbe-Zahlen aufweisen, jedoch müssen die thermischen Ausdehnungskoeffizienten möglichst gleich sein, damit der Formschluß zwischen den beiden Linsen auch bei Temperaturschwankungen erhalten bleibt und es nicht zu Verspannungen innerhalb der Linse kommt. Ein Materialpaar, das diese Voraussetzungen erfüllt, ist beispielsweise Polymethylmethacrylat (PMMA) – für die Sammellinse – und Polycarbonat (PC) – für die Zerstreuungslinse. Die Abbe-Zahl von PMMA beträgt ca. 57, während die Abbe-Zahl von PC ca. 30 beträgt. Die thermischen Ausdehnungskoeffizienten sind nahezu gleich und betragen 6 × 10–5/K (PMMA) bzw. 6,7 × 10–6/K (PC). Anstatt von PMMA kommt als Kunststoffmaterial für die Sammellinse auch Cycloolefin-Copolymer (COC) in Frage, das eine Abbezahl von 58 und einen Ausdehnungskoeffizienten von 6 × 10–5/K hat. 1 shows a tube ( 2 ) with an achromatic plastic lens ( 1 ), which consists of a converging lens ( 1A ) and a diverging lens ( 1B ) consists. Both lenses ( 1A . 1B ) are produced in one piece without an intermediate air gap in the two-component injection molding process and are positively connected with each other. The converging lens ( 1A ) uses a plastic material with a high Abbe number, while for the diverging lens ( 1B ) a plastic material with a lower Abbe number than the plastic material of the converging lens is used. In order for this to work, the materials of the converging lens and the diverging lens must have different Abbe numbers, but the thermal expansion coefficients must be as equal as possible so that the positive locking between the two lenses is maintained even with temperature fluctuations and there is no tension within the lens. One pair of materials that meets these requirements is, for example, polymethyl methacrylate (PMMA) - for the converging lens - and polycarbonate (PC) - for the diverging lens. The Abbe number of PMMA is approximately 57, while the Abbe number of PC is approximately 30. The thermal expansion coefficients are almost the same and are 6 × 10 -5 / K (PMMA) and 6.7 × 10 –6 / K (PC). Instead of PMMA, cycloolefin copolymer (COC), which has an Abbe number of 58 and an expansion coefficient of 6 × 10 -5 / K, can also be used as the plastic material for the converging lens.

Die Wirkungsweise der achromatischen Kunststofflinse zeigt 2. Wie zu erkennen ist, wird durch die Kombination der asphärischen Sammellinse (1A) aus PMMA mit der Zerstreuungslinse (1B) aus PC bewirkt, daß infrarotes Licht (λ = 950nm) und blaues Licht (λ = 435nm) in einem Brennpunkt fokussiert wird. Durch die formschlüssige Verbindung der beiden Linsen (1A, 1B) in Spritzgießtechnik entfallen aufwendige Fertigungsmethoden, wie z.B. Verkittung. Durch die Formschlüssigkeit entfallen zwei Linse-Luft-Grenzflächen, wodurch Transmissionsverluste oder aufwendige Antireflexschichten entfallen.The mode of operation of the achromatic plastic lens shows 2 , As can be seen, the combination of the aspherical converging lens ( 1A ) made of PMMA with the diverging lens ( 1B ) from PC causes infrared light (λ = 950nm) and blue light (λ = 435nm) to be focused in one focal point. Due to the positive connection of the two lenses ( 1A . 1B ) Injection molding technology eliminates the need for complex manufacturing methods such as cementing. The positive fit eliminates two lens-air interfaces, eliminating transmission losses or complex anti-reflective layers.

Darüber hinaus kann das Zweier-Linsensystem durch die Formschlüssigkeit wie eine einzige Linse behandelt werden, wodurch die Montage und die Handhabung des optischen Systems vereinfacht wird.In addition, the two-lens system through the form fit treated like a single lens, making assembly and the handling of the optical system is simplified.

Die erfindungsgemäße Kunststofflinse ist Teil eines optischen Systems für eine Kamera, vorzugsweise in Kraftfahrzeugen. Dabei besteht das System aus der Kunststofflinse (1) und dem die Linse (1) und einen Bildsensor (3) indirekt über eine Leiterplatte (5) tragenden Tubus (2). Außerdem ist im Strahlengang eine Aperturblende (3) angeordnet.The plastic lens according to the invention is part of an optical system for a camera, preferably in motor vehicles. The system consists of the plastic lens ( 1 ) and the lens ( 1 ) and an image sensor ( 3 ) indirectly via a printed circuit board ( 5 ) carrying tube ( 2 ). There is also an aperture diaphragm in the beam path ( 3 ) arranged.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

  • 1 Linse 1 lens
  • 1A Sammellinse 1A converging lens
  • 1C Grenzfläche zwischen den beiden formschlüssig verbundenen Linsen 1C Interface between the two positively connected lenses
  • 1B Zerstreuungslinse 1B diverging lens
  • 2 Tubus 2 tube
  • 2A 1. Tubusteil 2A 1. Tube part
  • 2B 2. Tubusteil 2 B 2. Tube part
  • 3 Aperturblende 3 aperture
  • 4 Bildsensor 4 image sensor
  • 5 Leiterplatte für den Bildsensor 5 PCB for the image sensor

Claims (3)

Verfahren zur Herstellung einer Kunststofflinse, dadurch gekennzeichnet, daß im Zweikomponenten-Spritzgießverfahren eine Sammellinse (1A) aus einem Kunststoffmaterial mit einer hohen Abbezahl und eine damit einstückig und formschlüssig verbundene Zerstreuungslinse (1B) aus einem Kunststoffmaterial mit einer im Vergleich zum Kunststoffmaterial der Sammellinse niedrigeren Abbezahl hergestellt wird, wobei die thermischen Ausdehnungskoeffizienten der Kunststoffmaterialien im wesentlichen gleich sind.Process for the production of a plastic lens, characterized in that, in the two-component injection molding process, a converging lens ( 1A ) made of a plastic material with a high Abbe number and thus ver one-piece and positive tied diverging lens ( 1B ) is made from a plastic material with a lower Abbe number than the plastic material of the converging lens, the thermal expansion coefficients of the plastic materials being essentially the same. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Herstellung der Sammellinse ein Polymethylmethacrylat (PMMA), ein PMMA-Copolymerisat oder ein Cycloolefin-Copolymer (COC) verwendet wird, zur Herstellung der Zerstreuungslinse Polycarbonat (PC) verwendet wird.A method according to claim 1, characterized in that to Production of the converging lens a polymethyl methacrylate (PMMA) PMMA copolymer or a cycloolefin copolymer (COC) is used, for the production the divergent lens polycarbonate (PC) is used. Kunststofflinse bestehend aus einer Sammellinse (1A) aus einem Kunststoffmaterial mit einer hohen Abbezahl und einer damit einstückig und formschlüssig verbundenen Zerstreuungslinse (1B) aus einem Kunststoffmaterial mit einer im Vergleich zum Kunststoffmaterial der Sammellinse niedrigeren Abbezahl, wobei die thermischen Ausdehnungskoeffizienten der Kunststoffmaterialien im wesentlichen gleich sind.Plastic lens consisting of a converging lens ( 1A ) made of a plastic material with a high Abbe number and a diverging lens connected to it in one piece and with a positive fit ( 1B ) from a plastic material with a lower Abbe number than the plastic material of the converging lens, the thermal expansion coefficients of the plastic materials being essentially the same.
DE10261974A 2002-05-10 2002-05-10 Plastic lens and method for producing a plastic lens Ceased DE10261974A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10220671A DE10220671B4 (en) 2002-05-10 2002-05-10 Optical system for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10220671A DE10220671B4 (en) 2002-05-10 2002-05-10 Optical system for a camera

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DE10261974A1 true DE10261974A1 (en) 2004-02-05

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DE10261974A Ceased DE10261974A1 (en) 2002-05-10 2002-05-10 Plastic lens and method for producing a plastic lens

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008080390A3 (en) * 2006-12-29 2008-09-25 Osram Opto Semiconductors Gmbh Lens arrangement und led display device
US7808645B2 (en) 2005-06-22 2010-10-05 Roche Diagnostics Operations, Inc. Analysis system for analyzing a sample on an analytical test element

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008141640A1 (en) 2007-05-21 2008-11-27 Micro-Epsilon Messtechnik Gmbh & Co. Kg Method for compensating for temperature related measurement errors in a confocal chromatic measuring distance sensor
DE102008027721A1 (en) * 2008-06-11 2009-12-17 Hella Kgaa Hueck & Co. Optical system with a device for compensation of thermal influences
DE102008047277A1 (en) * 2008-09-16 2010-04-15 Hella Kgaa Hueck & Co. Optical device for use as fixed focus camera system that is utilized as image pickup camera in motor vehicle, has compensation body provided with material including thermal expansion coefficient
CN105492953B (en) 2013-09-03 2019-09-13 维宁尔瑞典公司 The method of camara module and installation camara module for motor vehicles
EP2942938B1 (en) 2014-05-07 2021-01-27 Veoneer Sweden AB Camera module for a motor vehicle and method of pre-focusing a lens objective in a lens holder
EP4177654A1 (en) 2016-09-01 2023-05-10 Arriver Software AB Camera module for a motor vehicle
EP4148484A1 (en) * 2021-09-08 2023-03-15 Robert Bosch GmbH Imaging apparatus with axial focal distance athermalization

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339895C (en) * 1918-10-09 1921-08-17 Optique Et De Mecanique De Hau Arrangement to compensate for temperature influences on the true or apparent focal length of optical elements
JPS6482934A (en) * 1987-09-24 1989-03-28 Sunstar Engineering Inc Foamed sheet for leather mode vacuum molding
JPH095871A (en) * 1995-06-23 1997-01-10 Minolta Co Ltd Image photographic device
JPH10133087A (en) * 1996-10-31 1998-05-22 Nec Corp Focus position temperature variation compensating device
DE19842828A1 (en) * 1998-09-18 2000-03-23 Volkswagen Ag Optical system casing very suitable for digital cameras, is pressed entire from transparent material to integrate lens, with treatment making casing opaque in design offering diversity of applications in vehicles and craft
JP2001272587A (en) * 2000-03-24 2001-10-05 Konica Corp Photographing lens unit
JP2002014269A (en) * 2000-06-29 2002-01-18 Sony Corp Optical device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7808645B2 (en) 2005-06-22 2010-10-05 Roche Diagnostics Operations, Inc. Analysis system for analyzing a sample on an analytical test element
WO2008080390A3 (en) * 2006-12-29 2008-09-25 Osram Opto Semiconductors Gmbh Lens arrangement und led display device
US8754427B2 (en) 2006-12-29 2014-06-17 Osram Opto Semiconductors Gmbh Lens arrangement and LED display device

Also Published As

Publication number Publication date
DE10261973B4 (en) 2006-04-20
DE10261973A1 (en) 2004-01-29

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