DE975439C - Focusing screen for optical devices - Google Patents

Focusing screen for optical devices

Info

Publication number
DE975439C
DE975439C DEL18927A DEL0018927A DE975439C DE 975439 C DE975439 C DE 975439C DE L18927 A DEL18927 A DE L18927A DE L0018927 A DEL0018927 A DE L0018927A DE 975439 C DE975439 C DE 975439C
Authority
DE
Germany
Prior art keywords
focusing screen
optical devices
transparent
focusing
parts
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.)
Expired
Application number
DEL18927A
Other languages
German (de)
Inventor
Ludwig Dr Leitz
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.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar 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 Ernst Leitz Wetzlar GmbH filed Critical Ernst Leitz Wetzlar GmbH
Priority to DEL18927A priority Critical patent/DE975439C/en
Application granted granted Critical
Publication of DE975439C publication Critical patent/DE975439C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens
    • G03B13/26—Focusing screens with magnifiers for inspecting image formed on screen
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids

Description

Einstellscheibe für optische Geräte Bei optischen Geräten, beispielsweise der fotografischen Kamera, Einstellsucher und Mikroskop, dient zur Scharfeinstellung die Mattscheibe. Es ist bekannt, daß das Korn der Mattierung die Genauigkeit der Einstellung begrenzt und daß andererseits ein sehr feines Korn die Lichtstreuung so herabsetzt, daß das Bild nur in der Blickrichtung genügend hell erscheint. Daher hat man bekanntlich die Mattscheibe derart ausgebildet, daß innerhalb des durchscheinenden (matten) Teils ein durchsichtiger (klarer) Teil angebracht ist, durch den das Luftbild unmittelbar sichtbar und z. B. mittels einer Lupe einstellbar ist. Die Fokussierung erfolgt dabei mit Hilfe einer Marke, z. B. eines Strichkreuzes, das auf dem durchsichtigen Teil angebracht ist.Focusing disk for optical devices For optical devices, for example the photographic camera, setting viewfinder and microscope are used for focusing the screen. It is known that the grain of the matting increases the accuracy of the Setting limits and that, on the other hand, a very fine grain prevents light scattering so reduced that the image only appears bright enough in the direction of view. Therefore it is known that the ground glass is designed in such a way that within the translucent (matt) part a transparent (clear) part is attached through which the aerial photo immediately visible and z. B. is adjustable by means of a magnifying glass. The focus takes place with the help of a brand, e.g. B. a cross that is on the transparent Part is attached.

Bei dieser bekannten Anordnung besteht der Nachteil, daß die Helligkeit in den beiden Teilen sehr verschieden ist. Insbesondere ist wegen der starken Lichtkonzentration in Mikroskopen die Blendung in dem durchsichtigen Teil so groß, daß eine Einstellung verhindert wird bzw. daß bei Herabsetzung der Lampenhelligkeit das Bild auf dem mattierten, durchscheinenden Teil nicht mehr erkennbar ist, Die Erfindung betrifft eine Einstellscheibe mit durchsichtigen und mattierten Flächen für optische Geräte und besteht darin, daß die Transparenz der durchsichtigen Teile durch entsprechende Lichtabsorption der Helligkeit des Streulichtes der mattierten Teile in einem die Blendung beseitigenden Maße angepaßt ist. Eine derartige Einstellscheibe vermeidet eine Blendung des Auges durch das durch das Klarfeld der Mattscheibe durchlaufende Licht und ermöglicht neben einer genauen Scharfeinstellung auch gleichzeitig eine gute Erkennbarkeit des Übersichtsbildes auf der mattierten Fläche. Man kann nach der Erfindung insbesondere eine Mattscheibe in der Mitte durchbohren und in dieses Loch eine Scheibe aus durchsichtigem Grauglas einsetzen, dessen Absorption der Streuung des mattierten Teils gleichgemacht ist. Die eine Fläche des Grauglases, welches in der Ebene der mattierten Fläche liegt, kann mit einer Strichmarke versehen werden.In this known arrangement there is the disadvantage that the brightness is very different in the two parts. In particular, it is because of the strong concentration of light in microscopes the glare in the transparent part is so great that one setting is prevented or that when the lamp brightness is reduced, the image on the frosted, translucent part is no longer recognizable, The invention relates a focusing screen with transparent and matt surfaces for optical devices and consists in that the transparency of the transparent parts by corresponding Light absorption of the brightness of the scattered light of the frosted parts in a die Glare-eliminating dimensions is adapted. Such a setting disc avoids a glare of the eye from the one passing through the clear field of the focusing screen Light and, in addition to precise focusing, also enables one at the same time good visibility of the overview image on the matted surface. According to the invention, in particular, a ground glass screen can be pierced in the middle and in this hole insert a disc of transparent gray glass, its absorption is made equal to the scattering of the frosted part. The one surface of the gray glass, which lies in the plane of the matted surface can be provided with a line mark will.

Die erfindungsgemäße Einstellscheibe ist insbesondere für mikrofotografische Geräte und auch für Einstellsucher fotografischer Kameras vorteilhaft.The focusing screen according to the invention is in particular for microphotographic Devices and also advantageous for setting finders of photographic cameras.

Claims (3)

PATENTANSPRÜCHE: i. Einstellscheibe mit durchsichtigen und mattierten Flächen für optische Geräte, dadurch gekennzeichnet, daß die Transparenz der durchsichtigen Teile durch entsprechende Lichtabsorbtion der Helligkeit des Streulichtes der mattierten Teile in einem die Blendung beseitigenden Maße angepaßt ist. PATENT CLAIMS: i. Focusing screen with transparent and matted surfaces for optical devices, characterized in that the transparency of the transparent parts is adapted to the brightness of the scattered light of the matted parts to a degree that eliminates glare by means of appropriate light absorption. 2. Mikrofotografisches Gerät, dadurch gekennzeichnet, daß seine Einstellscheibe nach Anspruch i ausgebildet ist. 2. Microphotography Device, characterized in that its adjusting disk is designed according to claim i is. 3. Einstellsucher, dadurch gekennzeichnet, daß seine Einstellscheibe nach Anspruch i ausgebildet ist. In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. gig 984; USA.-Patentschrift Nr. 1572 236.3. Setting viewfinder, characterized in that its focusing screen is designed according to claim i. Documents considered: German Patent No. gig 984; USA. Pat. No. 1,572,236.
DEL18927A 1954-05-26 1954-05-26 Focusing screen for optical devices Expired DE975439C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL18927A DE975439C (en) 1954-05-26 1954-05-26 Focusing screen for optical devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL18927A DE975439C (en) 1954-05-26 1954-05-26 Focusing screen for optical devices

Publications (1)

Publication Number Publication Date
DE975439C true DE975439C (en) 1961-11-30

Family

ID=7261250

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL18927A Expired DE975439C (en) 1954-05-26 1954-05-26 Focusing screen for optical devices

Country Status (1)

Country Link
DE (1) DE975439C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1572236A (en) * 1924-03-26 1926-02-09 Eastman Kodak Co Camera obscura
DE919984C (en) * 1948-09-22 1954-11-08 Lucien Jules Emilie Andre Dodi Improvements to telemetry equipment with deflection prisms

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1572236A (en) * 1924-03-26 1926-02-09 Eastman Kodak Co Camera obscura
DE919984C (en) * 1948-09-22 1954-11-08 Lucien Jules Emilie Andre Dodi Improvements to telemetry equipment with deflection prisms

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