DE501915C - Bellows ventilation device on photographic roll film cameras - Google Patents
Bellows ventilation device on photographic roll film camerasInfo
- Publication number
- DE501915C DE501915C DEZ18213D DEZ0018213D DE501915C DE 501915 C DE501915 C DE 501915C DE Z18213 D DEZ18213 D DE Z18213D DE Z0018213 D DEZ0018213 D DE Z0018213D DE 501915 C DE501915 C DE 501915C
- Authority
- DE
- Germany
- Prior art keywords
- ribs
- frame
- film
- ventilation device
- roll film
- 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
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
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
Description
Die Erfindung betrifft eine Balgenbelüftungsvorrichtung an photographischen Rollfilmkameras, die es ermöglicht, bei denkbar größten Luftdurchlaßkanälen zwischen Blendrahmen und Filmvorderfläche ein ununterbrochenes Anlager der Filmseitenränder zum Blendrahmen zu gewährleisten.The invention relates to a bellows ventilation device on photographic roll film cameras, which make it possible to use the largest conceivable air ducts an uninterrupted attachment between the frame and the front surface of the film to ensure the edges of the film to the frame.
Die Erfindung besteht darin, daß seitlich längs der Belichtungsöffnung des Blendrahmens schräg nach außen zu gerichtete Rippen, Ausbuchtungen o. dgl. vorgesehen sind, auf denen die Ränder des Films aufliegen, derart, daß zwischen dem Film und dem Blendrahmen Luftkanäle gebildet werden. Ferner verlaufen die Rippen zu beiden Seiten der Belichtungsöffnung des Blendrahmens spiegelbildlich zueinander, und zwar so, daß ihre äußeren Enden dem Windeschlüssel zu gerichtet sind, um die Filmplanspannung zu erhöhen, ao Der Erfindungsgegenstand ist in einer Ausführungsform zeichnerisch wiedergegeben, und zwar zeigtThe invention consists in that laterally along the exposure opening of the window frame Ribs, bulges o which the edges of the film rest in such a way that between the film and the frame Air channels are formed. Furthermore, the ribs on both sides of the exposure opening of the window frame are mirror images of each other, in such a way that their outer ends are directed to the wind key to the To increase film plan tension, ao The subject matter of the invention is in one embodiment graphically reproduced, namely shows
Abb. ι eine Rollfilmkamera in Rückansicht, Rückwand gegenüber dem Blendrahmen entfernt, Fig. Ι a roll film camera in rear view, rear wall opposite the frame removed,
Abb. 2 einen teilweisen mittleren Längsschnitt durch Abb. 1 in vergrößertem Maßstab. Fig. 2 shows a partial central longitudinal section through Fig. 1 on an enlarged scale.
Seitlich aus dem Blendrahmen α des Kameragehäuses b sind, jeweils eine Längsreihe bildend, Rippen c nach der Rückwand b1 zu gepreßt. Auf diese legt sich, und zwar in Scheitellinie c1, der Film d, der durch eine federnde Planpreßplatte e, welche an der Kamerarückwand b1 in an sich bekannter Weise befestigt ist, den Rippen c zu gedrückt wird.Laterally from the frame α of the camera housing b , each forming a longitudinal row, ribs c are pressed to the rear wall b 1. The film d lies on this, namely in the apex line c 1 , which is pressed towards the ribs c by a resilient flat pressing plate e, which is attached to the camera rear wall b 1 in a manner known per se.
Auf diese Weise werden zwischen der Blendrahmenoberfläche ax, den sich zunächstliegenden Längswänden c2 der Rippen c und der Innenfläche d1 des Films Kanäle f gebildet, durch die von außen über die Filmkammern g, g1 hinweg beim Herausziehen des nicht dargestellten Objektivträgers Luft in den Balgen gelangt, während beim Schließen der Kamera die Luft aus dem Balgen durch die Kanäle f nach außen entweichen kann.In this way, channels f are formed between the frame surface a x , the adjacent longitudinal walls c 2 of the ribs c and the inner surface d 1 of the film, through which air enters from the outside via the film chambers g, g 1 when the lens carrier, not shown, is pulled out reaches the bellows, while when the camera is closed, the air from the bellows can escape to the outside through the channels f.
Um eine breite Auflagefläche der Filmseitenränder zu schaffen, sind die Rippen c in gleichen Abständen gleichgerichtet schräg nach den Seitenwandungen &2 und aufwärts der Aufwickelspule bzw. dem Windeschlüssel h zu gerichtet vorgesehen, so daß das innere Ende c3 der Rippe c in der Höhe des äußeren Endes c4 der daruntergelagerten Rippe c sich befindet.In order to create a wide contact surface for the side edges of the film, the ribs c are provided at equal intervals in the same direction obliquely towards the side walls & 2 and upwards of the take-up spool or the winding spanner h , so that the inner end c 3 of the rib c is at the height of the outer end c 4 of the underlying rib c is located.
Durch die zueinander entgegengesetzte Schräglage der Rippen wird nach beiden Kameraseitenwänden δ2 zu während des Filmbandtransports ein Zug ausgeübt, der zur Erhöhung der Planlage des Filmbandes beiträgt.Due to the mutually opposite inclination of the ribs, a pull is exerted after both camera side walls δ 2 zu during the film tape transport, which contributes to increasing the flatness of the film tape.
6060
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ18213D DE501915C (en) | Bellows ventilation device on photographic roll film cameras |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ18213D DE501915C (en) | Bellows ventilation device on photographic roll film cameras |
Publications (1)
Publication Number | Publication Date |
---|---|
DE501915C true DE501915C (en) | 1930-07-08 |
Family
ID=7624518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEZ18213D Expired DE501915C (en) | Bellows ventilation device on photographic roll film cameras |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE501915C (en) |
-
0
- DE DEZ18213D patent/DE501915C/en not_active Expired
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