DE864800C - Process for the manufacture of camera bellows - Google Patents

Process for the manufacture of camera bellows

Info

Publication number
DE864800C
DE864800C DEA13485A DEA0013485A DE864800C DE 864800 C DE864800 C DE 864800C DE A13485 A DEA13485 A DE A13485A DE A0013485 A DEA0013485 A DE A0013485A DE 864800 C DE864800 C DE 864800C
Authority
DE
Germany
Prior art keywords
camera bellows
manufacture
films
polyurethane
bellows
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
DEA13485A
Other languages
German (de)
Inventor
Ferdinand Dipl-Phys Wagner
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 NV
Original Assignee
Agfa Camera Werk 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 Camera Werk AG filed Critical Agfa Camera Werk AG
Priority to DEA13485A priority Critical patent/DE864800C/en
Application granted granted Critical
Publication of DE864800C publication Critical patent/DE864800C/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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/04—Bodies collapsible, foldable or extensible, e.g. book type
    • G03B17/045—Bellows
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms And Bellows (AREA)
  • Laminated Bodies (AREA)

Description

Verfahren zur Herstellung von Kamerabalgen Die bisher für photographische Kameras verwendeten Balgenfolien aus Kunststoffen. waren vielfach auf der Basis von Kautschuk und Polyamiden hergestellt. Die Kautschukfolien haben jedoch denNachteil, daß sieLuftsauerstoff aufnehmen und dadurch mit der Zeit brüchig werden, während dieFolien aus Polyamiden sich nicht als hinreichend kältebeständig erwiesen.Process for the production of camera bellows The hitherto for photographic Cameras used plastic bellows foils. were in many cases on the base made of rubber and polyamides. However, the rubber films have the disadvantage that they absorb oxygen from the air and thereby become brittle over time, while the polyamide films have not proven to be sufficiently cold-resistant.

Es wurde daher vorgeschlagen, als Balgenfolien solche auf der Basis von Polyurethanen zu verwenden, die die obenerwähnten Nachteile nicht haben.It has therefore been proposed that the bellows foils be those based on to use polyurethanes which do not have the disadvantages mentioned above.

Bei der Verwendung besonders kältebeständiger Polyurethanfolien ergab sich jedoch der Übelstand, daß diese in der Wärme und unter Druck miteinander verkleben. Zur Vermeidung dieser Nachteile wird erfindungsgemäß vorgeschlagen, die Polyurethanfolien mit einem äußerst dünnen überzu- aus einem elastischen, wärme- und druckunempfindlichen Lack zu versehen. Als besonders geeignet für diesen Zweck haben sich gewisse auf der Basis von Superpolyamiden oder Silikonen beruhende Lacke erwiesen.When using particularly cold-resistant polyurethane films resulted However, the disadvantage is that these stick together in the heat and under pressure. To avoid these disadvantages, the invention proposes the polyurethane films with an extremely thin one on top of an elastic one that is insensitive to heat and pressure To provide varnish. Certain have proven to be particularly suitable for this purpose Coatings based on super polyamides or silicones have been proven.

Es hat sich gezeigt, daß die mit einem solchen Lack überzogenen Polyamidfolien bei Temperaturen von etwa 8ö° C sowie bei den in der geschlossenen Kamera auftretenden Drücken keine Neigung zum Verkleben zeigen.It has been shown that the polyamide films coated with such a lacquer at temperatures of around 80 ° C as well as those occurring in the closed camera Pressing show no tendency to stick.

Claims (1)

PATENTANSPRÜCHE: r. Verfahren zur Herstellung von Kamerabalgen aus Polyurethanfolien, dadurch gekennzeichnet, daß die Folien mit einem äußerst dünnen Überzug aus einem elastischen, gegen Wärme und Druck unempfindlichen Lack versehen werden. a. Kamerabalgen aus Polyurethanfolien, gekennzeichnet durch einen dünnen Überzug aus einem auf der Basis von Superpolyamiden oder Silikonen beruhenden Lack.PATENT CLAIMS: r. Process for the production of camera bellows Polyurethane films, characterized in that the films with an extremely thin Cover made of an elastic varnish that is insensitive to heat and pressure will. a. Camera bellows made of polyurethane foils, characterized by a thin one Coating of a varnish based on super polyamides or silicones.
DEA13485A 1951-06-10 1951-06-10 Process for the manufacture of camera bellows Expired DE864800C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA13485A DE864800C (en) 1951-06-10 1951-06-10 Process for the manufacture of camera bellows

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA13485A DE864800C (en) 1951-06-10 1951-06-10 Process for the manufacture of camera bellows

Publications (1)

Publication Number Publication Date
DE864800C true DE864800C (en) 1953-01-29

Family

ID=6922860

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA13485A Expired DE864800C (en) 1951-06-10 1951-06-10 Process for the manufacture of camera bellows

Country Status (1)

Country Link
DE (1) DE864800C (en)

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