DE10261973A1 - Camera optical system has plastic lens with focal length thermal expansion compensation using longer mounting tube and low expansion holder - Google Patents
Camera optical system has plastic lens with focal length thermal expansion compensation using longer mounting tube and low expansion holder Download PDFInfo
- Publication number
- DE10261973A1 DE10261973A1 DE2002161973 DE10261973A DE10261973A1 DE 10261973 A1 DE10261973 A1 DE 10261973A1 DE 2002161973 DE2002161973 DE 2002161973 DE 10261973 A DE10261973 A DE 10261973A DE 10261973 A1 DE10261973 A1 DE 10261973A1
- Authority
- DE
- Germany
- Prior art keywords
- lens
- tube
- image sensor
- focal length
- holder
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 13
- 239000004033 plastic Substances 0.000 title claims abstract description 11
- 229920003023 plastic Polymers 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 28
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
Abstract
Description
Die Erfindung betrifft ein optisches
System für
eine Kamera bestehend aus mindestens einer Linse und einem die Linse
und den Bildsensor haltenden Tubus. Ein derartiges System ist aus
der
In der
In der Druckschrift JP 58-7109 A wird zur Lösung dieses Problems vorgeschlagen, den Bildsensor auf einem Material anzuordnen, das einen auf das Material der Linse abgestimmten thermischen Ausdehnungskoeffizienten aufweist, und zwar derart abgestimmt, daß eine durch Temperaturänderungen bedingte Änderung der Linsenbrennweite durch eine thermische Längenänderung dieses Materials zumindest weitgehend kompensiert wird.JP 58-7109 A becomes the solution of this problem suggested the image sensor on a material to arrange, which has a thermal expansion coefficient matched to the material of the lens has, and tuned such that a change due to temperature changes the lens focal length due to a thermal change in length of this material at least is largely compensated.
Da die zur Kompensation zur Verfügung stehende
Tubuslänge
bei einer gattungsgemäßen Anordnung
gemäß
Aufgabe der Erfindung ist es daher,
das aus der
Zu diesem Zweck ist es erfindungsgemäß vorgesehen, daß die Linse indirekt über einen Linsenhalter von dem Tubus gehalten wird, so daß die Linse über den Linsenhalter axial innenliegend, beabstandet vom Tubusende im Tubus angeordnet ist. Die Länge des Tubus kann dann größer sein als die Brennweite der Linse, also größer als der Abstand zwischen Linse und Bildsensor. Auf diese Weise wird die erfindungsgemäß wirksame Länge des Tubus vergrößert. Dies bewirkt nun wiederum eine Kompensationsmöglichkeit für größere Brennweitenänderungen; da die thermische Längenänderung proportional zum thermischen Ausdehnungskoeffizienten und proportional zur Länge des Tubus selbst ist. Damit dies funktioniert, muß jedoch für den Linsenhalter ein Material verwendet werden, das sich im Vergleich zum Material des Tubus vergleichsweise wenig thermisch ausdehnt. Mit anderen Worten wird über den Linsenhalter eine Faltung des optischen Systems bewirkt, so daß trotz des vorteilhaft längeren Tubus der Abstand zwischen Linse und Bildsensor wieder der Brennweite entspricht.For this purpose, the invention provides that the Lens indirectly via a lens holder is held by the tube so that the lens over the Lens holder axially inside, spaced from the tube end in the tube is arranged. The length the tube can then be larger than the focal length of the lens, i.e. larger than the distance between Lens and image sensor. In this way, the effective according to the invention Length of Tube enlarged. This now in turn causes a compensation possibility for larger focal length changes; because the thermal change in length proportional to the coefficient of thermal expansion and proportional to length of the tube itself. For this to work, however for the Lens holder a material can be used, which is compared to the Comparatively little thermal expansion of the tube material. With other words is about causes the lens holder to fold the optical system, so that despite of the advantageously longer Tube the distance between lens and image sensor again the focal length equivalent.
Alternativ oder zusätzlich zum Linsenhalter kann die Faltung des optischen Systems auch durch einen Bildsensorhalter realisiert werden, über den der Bildsensor indirekt mit dem Tubus verbunden und gehalten ist, so daß der Bildsensor über den Bildsensorhalter axial innenliegend, beabstandet vom Tubusende im Tubus angeordnet ist. Dabei gilt für das Material des Bildsensorhalters im Vergleich zum Tubusmaterial das gleiche wie für das Material des Linsenhalters.Alternatively or in addition to Lens holder can also fold the optical system through a Image sensor holder can be realized via which the image sensor indirectly is connected to the tube and held so that the image sensor over the Image sensor holder axially inside, spaced from the tube end in Tube is arranged. The same applies to the material of the image sensor holder compared to the tube material the same as for the material of the lens holder.
Eine Verlängerung der für die Temperaturkompensation zur Verfügung stehenden Tubuslänge kann auch durch Verwendung einer Linse mit Retrofokus erreicht werden. Bei einer Linse oder einem Linsensystem mit Retrofokus ist der Abstand der letzten oder der einzigen Linse zum Bildsensor größer als die Brennweite der Linse. Auf diese Weise kann ebenfalls eine Vergrößerung der Tubuslänge erreicht werden, wodurch die für die Temperaturkompensation der Brennweitenänderung verfügbare Länge positiv vergrößert wird.An extension for temperature compensation to disposal standing tube length can can also be achieved by using a lens with retrofocus. In the case of a lens or a lens system with retrofocus, the distance is the last or the only lens to the image sensor larger than the focal length of the lens. In this way, an increase in the Tube length can be achieved, making the for the temperature compensation of the change in focal length available length positive is enlarged.
Als Tubusmaterial sind dabei zum Beispiel besonders Polyamide geeignet, die einen besonders hohen thermischen Ausdehnungskoeffizienten von ca. 20 × 10–5/K haben.Polyamides which have a particularly high coefficient of thermal expansion of approximately 20 × 10 -5 / K are particularly suitable as tube material.
Als Kunststoffmaterial für die Linse wird vorzugsweise Polymethylmethacrylat (PMMA), ein PMMA-Copolymerisat, ein Cycloolefin-Copolymer (COC) und/oder Polycarbonat (PC) verwendet. Zum Abspritzen des Tubus wird vorzugsweise ein eingefärbtes Kunststoffmaterial verwendet.As a plastic material for the lens is preferably polymethyl methacrylate (PMMA), a PMMA copolymer, a cycloolefin copolymer (COC) and / or polycarbonate (PC) used. A colored plastic material is preferably used to spray the tube used.
Anhand der beigefügten Zeichnungen soll die Erfindung nachfolgend veranschaulicht werden. Es zeigt:The invention is based on the accompanying drawings are illustrated below. It shows:
Um die thermisch bedingte Brennweitenänderung
der Linse (
Um die temperaturabhängige Änderung
der Linsenbrennweite stärker
kompensieren zu können, sind
erfindungsgemäß „gefaltete" optische Systeme vorgesehen.
Während
die Tubuslänge
gemäß dem Stand
der Technik (
In
- 11
- Linselens
- 22
- Tubustube
- 33
- Aperturblendeaperture
- 44
- Bildsensorimage sensor
- 55
- Leiterplatte für den Bildsensorcircuit board for the image sensor
- 66
- Linsenhalterlens holder
- 77
- BildsensorhalterImage sensor holder
- 88th
- Optische Achseoptical axis
Claims (3)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10261973A1 true DE10261973A1 (en) | 2004-01-29 |
DE10261973B4 DE10261973B4 (en) | 2006-04-20 |
Family
ID=29795798
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10261974A Ceased DE10261974A1 (en) | 2002-05-10 | 2002-05-10 | Plastic lens and method for producing a plastic lens |
DE10261973A Expired - Fee Related DE10261973B4 (en) | 2002-05-10 | 2002-05-10 | Optical system for a camera and method for its production |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10261974A Ceased DE10261974A1 (en) | 2002-05-10 | 2002-05-10 | Plastic lens and method for producing a plastic lens |
Country Status (1)
Country | Link |
---|---|
DE (2) | DE10261974A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US8248598B2 (en) | 2007-05-21 | 2012-08-21 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Method for compensating for temperature related measurement errors in a confocal chromatic measuring distance sensor |
WO2015032512A1 (en) * | 2013-09-03 | 2015-03-12 | Autoliv Development Ab | Camera module for a motor vehicle and method of mounting a camera module |
EP2942938A1 (en) | 2014-05-07 | 2015-11-11 | Autoliv Development AB | Camera module for a motor vehicle and method of pre-focusing a lens objective in a lens holder |
EP3290979A1 (en) | 2016-09-01 | 2018-03-07 | Autoliv Development 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 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE385571T1 (en) | 2005-06-22 | 2008-02-15 | Hoffmann La Roche | ANALYSIS SYSTEM FOR ANALYZING A SAMPLE ON AN ANALYTICAL TEST ELEMENT |
DE102006062066A1 (en) * | 2006-12-29 | 2008-07-03 | Osram Opto Semiconductors Gmbh | Lens arrangement for light emitting diode display device, has lens with lens surface and optical axis, which penetrates lens surface of lens |
DE102022131950A1 (en) * | 2022-12-02 | 2024-06-13 | Marelli Automotive Lighting Reutlingen (Germany) GmbH | Projection lens having two partial lenses for a motor vehicle headlight and method for producing such a projection lens |
Family Cites Families (7)
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 |
-
2002
- 2002-05-10 DE DE10261974A patent/DE10261974A1/en not_active Ceased
- 2002-05-10 DE DE10261973A patent/DE10261973B4/en not_active Expired - Fee Related
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8248598B2 (en) | 2007-05-21 | 2012-08-21 | 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 |
WO2015032512A1 (en) * | 2013-09-03 | 2015-03-12 | Autoliv Development Ab | Camera module for a motor vehicle and method of mounting a camera module |
JP2016534403A (en) * | 2013-09-03 | 2016-11-04 | オートリブ ディベロップメント エービー | Camera module for automobile and method for attaching camera module |
US10054757B2 (en) | 2013-09-03 | 2018-08-21 | Veoneer Sweden Ab | Camera module for a motor vehicle and method of mounting a camera module |
EP2942938A1 (en) | 2014-05-07 | 2015-11-11 | Autoliv Development AB | Camera module for a motor vehicle and method of pre-focusing a lens objective in a lens holder |
US9883086B2 (en) | 2014-05-07 | 2018-01-30 | Autoliv Development Ab | Camera module for a motor vehicle and method of pre-focusing a lens objective in a lens holder |
EP3290979A1 (en) | 2016-09-01 | 2018-03-07 | Autoliv Development AB | Camera module for a motor vehicle |
WO2018041951A1 (en) | 2016-09-01 | 2018-03-08 | Autoliv Development Ab | Camera module for a motor vehicle |
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 |
Also Published As
Publication number | Publication date |
---|---|
DE10261973B4 (en) | 2006-04-20 |
DE10261974A1 (en) | 2004-02-05 |
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