DE3005621A1 - Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index - Google Patents

Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index

Info

Publication number
DE3005621A1
DE3005621A1 DE19803005621 DE3005621A DE3005621A1 DE 3005621 A1 DE3005621 A1 DE 3005621A1 DE 19803005621 DE19803005621 DE 19803005621 DE 3005621 A DE3005621 A DE 3005621A DE 3005621 A1 DE3005621 A1 DE 3005621A1
Authority
DE
Germany
Prior art keywords
refractive index
layer
low refractive
esp
rear surface
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Withdrawn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
DE19803005621
Other languages
German (de)
Inventor
Walter Dipl Ing Duenisch
Ulrich Ing Grad Krekeler
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert 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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Priority to DE19803005621 priority Critical patent/DE3005621A1/en
Publication of DE3005621A1 publication Critical patent/DE3005621A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0808—Mirrors having a single reflecting layer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The mirror consists of at least two layers with alternate high (a)- and low (b)- refractive index, and a covered layer of optically dense Al. One layer (a) is pref. next to the glass, whereas one layer (b) is next to the Al; and four layers (a,b,a,b) are pref. used. The surface of the Al exposed to air is pref. covered by a protective material, e.g. a layer of silica. The invention provides a mirror with high reflection for visible light and high climatic resistance, suitable esp. for catadioptric systems using two lenses.

Description

RückflächenspiegelRear surface mirror

Die Erfindung betrifft einen Rückflächenspiegel insbesondere zur Verwendung für Spiegelobjektive aus Glas.The invention relates to a rear surface mirror particularly for use for mirror lenses made of glass.

Rückflächenspiegel aus Aluminium, wie sie z.B. in katadioptrischen Systemen verwendet werden, haben gegenüber einem Frontspiegel ein deutlich geringeres Reflexionsvermögen, da der reflektierende Lichtstrahl erst nach erneutem Durchlaufen des Glases bzw. der Linse in Luft austreten kann.Rear surface mirrors made of aluminum, such as those used in catadioptric Systems used have a significantly lower level than a front mirror Reflectivity, as the reflecting light beam only passes through it again the glass or the lens can escape into air.

Bei katadioptrischen Systemen kann man zwar das dffnungsverhältnis des Objektivs durch Verqrösserung der Linsen steigern, um die Helligkeit anzuheben, dadurch wird aber die Tiefenschärfe des Objektivs verringert, ausserdem erhöhen sich die Herstellkosten.In catadioptric systems, it is true that the opening ratio increase the lens by enlarging the lenses to increase the brightness, however, this reduces and also increases the depth of field of the lens the manufacturing costs.

Um das Reflexionsvermögen der Spiegelobjektive Zu vergrössern, hat man schon -frühzeitig versucht, anstelle von Aluminium hochreflektierende Spiegel aus Silber verwenden. Silberspiegel lassen sich jedoch wegen der hohen Korrosionsanfälligkeit nur in aufwendig herzustellenden, hermetisch gekapselten Systemen einsetzen.To increase the reflectivity of the mirror lenses, has one tries early on to use highly reflective mirrors instead of aluminum use made of silver. However, silver mirrors can be used because of their high susceptibility to corrosion Use only in complex, hermetically sealed systems.

Es ist das Ziel der Erfindung, einen Rückflächenspiegel zu schaffen, der ein sehr hohes Reflexionsvermögen für den sichtbaren Bereich des Lichtes aufweist und sich durch hohe Klimabeständigkeit auszeichnet.It is the object of the invention to provide a rear surface mirror, which has a very high reflectivity for the visible range of light and is characterized by high climate resistance.

Gemäß der Erfindung wird dies dadurch erreicht, daß er aus wenigstens zwei Schichten aus abwechselnd hoch- und niederbrechendem Material und aus einer gedeckten, optisch dichten Aluminiumschicht besteht.According to the invention this is achieved in that it consists of at least two layers of alternating high and low refractive index material and one covered, optically dense aluminum layer.

Vorzugsweise wird jedoch ein aus vier dielektrischen Schichten und einer Aluminiumschicht bestehendes System verwendet, wobei die erste an das Glas (Linse) angrenzende Schicht eine hochbrechende ist. Eine fünfte Schicht besteht zweckmässig aus einer gedeckten Aluminiumschicht, die, um ausreichend vor Verkratzung geschützt zu sein, mit einer harten Deckschicht aus z.B. Si02 überzogen wird.Preferably, however, one of four dielectric layers and A system consisting of an aluminum layer is used, the first being to the glass (Lens) adjacent layer is a high refractive index. There is a fifth layer appropriately made of a covered aluminum layer, which is sufficient to protect against scratching to be protected, is covered with a hard top layer of e.g. Si02.

Einzelheiten der Erfindung ergeben sich aus dem folgenden Ausführungsbeispiel, dessen Eigenschaften anhand der Zeichnung erläutert werden.Details of the invention emerge from the following exemplary embodiment, whose properties are explained with reference to the drawing.

Auf die Rückfläche einer Linse für ein katadioptrisches System wird angrenzend an Glas in bekannter Weise folgendes Schichtsystem aufgebracht Ti02 //4 mg2 3/4 TiO2 MgF2 1500 t Al 5000 x SiO2 = Schutzschicht.On the back surface of a lens for a catadioptric system Adjacent to the glass, the following layer system is applied in a known manner: Ti02 // 4 mg2 3/4 TiO2 MgF2 1500 t Al 5000 x SiO2 = protective layer.

Die optischen Schichtdicken für die dielektrischen Schichten sind auf die Bezugsqellenlänge ( ) von 540 nm bezogen, die Schichtdickenangabe für Aluminium bezieht sich auf die mechanische Schichtstärke.The optical layer thicknesses for the dielectric layers are based on the reference wavelength () of 540 nm, the specified layer thickness for aluminum refers to the mechanical layer thickness.

Das Reflexionsvermögen dieses gegen klimatische Einflüsse ausserordentlich beständigen Rückflächenspiegels beträgt für den sichtbaren Bereich des Lichtes 400 nm bis 750 nm durchschnittlich 94 %, gemessen unter 45 ° an einer 2 mm starken planparallelen Probeplatte.The ability of this to reflect against climatic influences is extraordinary constant rear surface mirror is 400 for the visible range of light nm to 750 nm on average 94%, measured at 45 ° on a 2 mm thick plane-parallel Sample plate.

Bezogen auf das angeführte Beispiel eines katadioptrischen Objektivs, bestehend aus zwei Linsen, ergibt sich die in der Zeichnung wiedergegebene Transmission im Vergleich zu einem mit üblichem Aluminiumrückflächenspiegel versehenen baugleichen Objektiv.With reference to the example given of a catadioptric lens, consisting of two lenses, the transmission shown in the drawing results in comparison to a structurally identical one provided with a conventional aluminum rear surface mirror Lens.

Claims (4)

AnsprUche 1. Rückflächenspiegel insbesondere zur Verwendung für Spiegelobjektive aus Glas, dadurch gekennzeichnet, daß er aus wenigstens zwei Schichten aus abwechselnd hoch- und niederbrechendem Material und aus einer gedeckten, optisch dichten Aluminiumschicht besteht.Claims 1. Rear surface mirror, in particular for use for mirror lenses made of glass, characterized in that it is made up of at least two layers alternately high and low refractive index material and a covered, optically dense aluminum layer consists. 2. Rückflächenspiegel nach Anspruch 1, dadurch gekennzeichnet, daß eine hochbrechende Schicht am Glas und eine niedrigbrechende Schicht an der Aluminiumschicht angrenzt.2. rear surface mirror according to claim 1, characterized in that a high refractive index layer on the glass and a low refractive index layer on the aluminum layer adjoins. 3. Rückflächenspiegel nach Anspruch 2, dadurch gekennzeichnet, daß er aus vier abwechselnd hoch- und niedrigbrechenden Schichten und einer Aluminiumschicht besteht.3. rear surface mirror according to claim 2, characterized in that it consists of four alternating high and low refractive index layers and an aluminum layer consists. 4. Rückflächenspiegel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß auf die Aluminiumschicht angrenzend an Luft eine Schutzschicht, beispielsweise aus Sir2, aufgebracht ist.4. rear surface mirror according to one of the preceding claims, characterized characterized in that on the aluminum layer adjacent to air a protective layer, for example from Sir2, is applied.
DE19803005621 1980-02-15 1980-02-15 Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index Withdrawn DE3005621A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803005621 DE3005621A1 (en) 1980-02-15 1980-02-15 Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803005621 DE3005621A1 (en) 1980-02-15 1980-02-15 Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index

Publications (1)

Publication Number Publication Date
DE3005621A1 true DE3005621A1 (en) 1981-08-20

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ID=6094656

Family Applications (1)

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DE19803005621 Withdrawn DE3005621A1 (en) 1980-02-15 1980-02-15 Back reflection mirror - esp. for glass lens in catadioptric system, using alternate layers of high and low refractive index

Country Status (1)

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DE (1) DE3005621A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176935A2 (en) * 1984-10-01 1986-04-09 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles, with a back layer
EP0177834A2 (en) * 1984-10-01 1986-04-16 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles
US4944581A (en) * 1988-09-20 1990-07-31 Olympus Optical Company Limited Rear face reflection mirror of multilayer film for synthetic resin optical parts
US5022726A (en) * 1989-12-20 1991-06-11 Viratec Thin Films, Inc. Magnesium film reflectors
US5790327A (en) * 1992-03-06 1998-08-04 Quantum Corporation Apparatus and method for fabricating a deflection mirror tower
DE102019219177A1 (en) * 2019-12-09 2021-06-10 Carl Zeiss Smt Gmbh Optical element with a protective coating, process for its production and optical arrangement

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176935A2 (en) * 1984-10-01 1986-04-09 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles, with a back layer
EP0177834A2 (en) * 1984-10-01 1986-04-16 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles
EP0176935A3 (en) * 1984-10-01 1988-07-27 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles, with a back layer
EP0177834A3 (en) * 1984-10-01 1988-08-03 Flachglas Aktiengesellschaft Rear view mirror for vehicles, in particular motor vehicles
US4944581A (en) * 1988-09-20 1990-07-31 Olympus Optical Company Limited Rear face reflection mirror of multilayer film for synthetic resin optical parts
US5022726A (en) * 1989-12-20 1991-06-11 Viratec Thin Films, Inc. Magnesium film reflectors
WO1991009329A1 (en) * 1989-12-20 1991-06-27 Viratec Thin Films, Inc. Magnesium film reflectors
US5790327A (en) * 1992-03-06 1998-08-04 Quantum Corporation Apparatus and method for fabricating a deflection mirror tower
US5793731A (en) * 1992-03-06 1998-08-11 Quantum Corporation Apparatus and method for fabricating a deflection mirror tower
US5835290A (en) * 1992-03-06 1998-11-10 Quantum Corporation Deflection mirror tower for an optical disk drive
US5838503A (en) * 1992-03-06 1998-11-17 Quantum Corporation Deflection mirror tower
US5872663A (en) * 1992-03-06 1999-02-16 Quantum Corporation Apparatus and method for fabricating a deflection mirror tower
DE102019219177A1 (en) * 2019-12-09 2021-06-10 Carl Zeiss Smt Gmbh Optical element with a protective coating, process for its production and optical arrangement

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