DE551734C - Concentric dimming multi-color filter - Google Patents

Concentric dimming multi-color filter

Info

Publication number
DE551734C
DE551734C DEI40947D DEI0040947D DE551734C DE 551734 C DE551734 C DE 551734C DE I40947 D DEI40947 D DE I40947D DE I0040947 D DEI0040947 D DE I0040947D DE 551734 C DE551734 C DE 551734C
Authority
DE
Germany
Prior art keywords
concentric
color filter
dimming
color
filter
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
DEI40947D
Other languages
German (de)
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Publication date
Priority to DEI40947D priority Critical patent/DE551734C/en
Application granted granted Critical
Publication of DE551734C publication Critical patent/DE551734C/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
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Television Image Signal Generators (AREA)

Description

Beim farbenphotographischen Verfahren nach Patent 223 236 werden aus mehreren parallelen Farbstreifen bestehende Mehrfarbenfilter verwendet. In diesem Fall ist die übliche konzentrische Abblendung mit Lochoder Irisblenden nicht möglich, weil sich bei einer derartigen Abblendung das Verhältnis der Flächeninhalte der Farbstreifen bei zunehmender Abblendung in immer stärkerem Maße zugunsten des mittleren Farbstreifens verschieben und damit die Farbtreue der Aufnahme in Frage gestellt würde.In the color photographic process according to Patent 223,236, several existing multi-color filters are used in parallel color stripes. In this case it is The usual concentric masking with pinhole or iris diaphragms is not possible because such a stop the ratio of the areas of the colored stripes with increasing More and more dimming in favor of the middle color stripe move and thus the color fidelity of the recording would be called into question.

Gegenstand der Erfindung ist ein besonders ausgebildetes Mehrfarbenfilter, bei welchem die konzentrische Abblendung ohne Farbverfälschung möglich ist. Vor oder auf dem Filter ist eine Maske von solcher Form angeordnet, daß das Verhältnis der Farbstreifen bei jeder beliebigen Abblendung unverändert bleibt. In der Abbildung ist eine Maske dieser Art beispielsweise dargestellt, die auf die Mitte des Filters aufgesetzt wird und von einer Kurve bestimmter Gestalt begrenzt ist.The invention relates to a specially designed multicolor filter in which the concentric masking is possible without color distortion. Before or on the Filter is placed a mask of such a shape that the ratio of the color stripes remains unchanged at any stop. In the picture is a mask of this type, for example, which is placed on the center of the filter and from a curve of a certain shape is limited.

Bei voller Öffnung des Objektivs (Durchmesser D1) besteht der blaue Streifen aus den Flächen O1 + b2, der grüne Streifen aus den Flächen gt + g° + g3 + g*, der rote StreifenWhen the lens is fully open (diameter D 1 ), the blue stripe consists of the areas O 1 + b 2 , the green stripe consists of the areas g t + g ° + g 3 + g *, the red stripe

aus den Flächen rt -j- r2. Bei Abblendung des Objektivs auf den Durchmesser D2 besteht der blaue Streifen aus der Fläche b2, der grüne Streifen aus den Flächen g2 + g3, der rote Streifen aus der Fläche r2. Für beide Fälle muß folgende Beziehung bestehen:from the areas r t -j- r 2 . When the lens is stopped down to diameter D 2 , the blue stripe consists of area b 2 , the green stripe consists of areas g 2 + g 3 , and the red stripe consists of area r 2 . The following relationship must exist for both cases:

(Pi + h) ■ fei + g2 + gs + gi) ■■ (T1 + r2)
= t>2 ■ (ft + ft) : ra. (Pi + h) ■ fei + g2 + g s + gi) ■■ (T 1 + r 2 )
= t> 2 ■ (ft + ft): r a .

Der Erfindungsgedanke ist selbstverständlich auch auf Filter mit mehr als drei Farbstreifen anwendbar, wobei allerdings- die Kurven eine andere Gestalt annehmen würden. Ferner können die Umrisse der abblendenden Maske leicht auch derartig gewählt werden, daß der optische Schwerpunkt der beiden äußeren Filterstreifen sich bei der Abblendung nicht seitlich verschiebt.The idea of the invention is of course also applicable to filters with more than three colored stripes applicable, although the curves would assume a different shape. Furthermore, the outlines of the masking mask can easily be chosen in such a way that the optical focus the two outer filter strips do not move sideways when dimming.

Claims (1)

Patentanspruch:Claim: Konzentrisch abblendbares Mehrfarbenfilter, gekennzeichnet durch eine vor oder auf dem Filter angeordnete Maske von solcher Form, daß das Verhältnis der Flächeninhalte der Farbstreifen bei beliebiger konzentrischer Abblendung unverändert bleibt.Concentric dimming multi-color filter, characterized by a mask arranged in front of or on the filter of such a shape that the ratio of the The area of the colored strips remains unchanged with any concentric masking remain. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DEI40947D Concentric dimming multi-color filter Expired DE551734C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI40947D DE551734C (en) Concentric dimming multi-color filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI40947D DE551734C (en) Concentric dimming multi-color filter

Publications (1)

Publication Number Publication Date
DE551734C true DE551734C (en) 1932-06-04

Family

ID=7190426

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI40947D Expired DE551734C (en) Concentric dimming multi-color filter

Country Status (1)

Country Link
DE (1) DE551734C (en)

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