US20020021413A1 - Film guide for a movie camera - Google Patents
Film guide for a movie camera Download PDFInfo
- Publication number
- US20020021413A1 US20020021413A1 US09/470,932 US47093299A US2002021413A1 US 20020021413 A1 US20020021413 A1 US 20020021413A1 US 47093299 A US47093299 A US 47093299A US 2002021413 A1 US2002021413 A1 US 2002021413A1
- Authority
- US
- United States
- Prior art keywords
- platen
- film
- movie
- film guide
- guide according
- 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.)
- Granted
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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
- G03B19/00—Cameras
- G03B19/18—Motion-picture cameras
-
- 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
- G03B1/00—Film strip handling
- G03B1/42—Guiding, framing, or constraining film in desired position relative to lens system
- G03B1/48—Gates or pressure devices, e.g. plate
Definitions
- the invention relates to a film guide for a movie camera according to the introductory clause of claim 1 .
- Film guides for movie films in movie cameras have a distance window positioned in the optical path of rays of the shooting lens of the movie camera, whereby this distance window consists of a picture gate, which determines the size of the area of the individual pictures of the movie film to be exposed, side walls running in the longitudinal direction of the movie film and bordering on the side edges of the movie film, and a platen lying opposite the picture gate, whereby the movie film is moved between these components.
- Picture gate, platen and side walls thus form a film guiding channel, which fixes the movie film in a picture plane in such a way as to ensure a constant support dimension, i.e. a constant-remaining focusing plane for the movie film during film transport.
- the side stems there are grooves or bores for receiving the gripper points as well as possibly a locking gripper of a film transport mechanism for film transport and for ensuring a picture standing position.
- Movie films generally consist of an underlay made of triacetate or polyester with high breaking strength and dimensional stability both with normal picture speeds and very high picture speeds, a light-sensitive emulsion applied to one side of the underlay (the front side of the movie film), whereby this emulsion is covered externally by a protective layer, and a back layer or sliding layer applied to the other side of the underlay, whereby this layer is generally formed in an anti-static way for the purpose of avoiding static flashes on the movie film.
- the platen has so-called sliding stems for the purpose of reducing the friction on the movie film, whereby these sliding stems can extend in the movement direction of the movie film or at right angles or diagonally to the movement direction and lie on the back layer of the movie film, in such a way that at these points there is a stronger reflection than on the actual platen, which is reproduced in the picture content as a lattice structure.
- the solution according to the invention ensured the maintaining of minimal friction of the movie film in the film guide of the distance window, while ensuring exact guiding of the movie film in the region of the picture plane or focusing plane, and while avoiding reflections of the shooting path of rays on the platen as well as distortions of the picture content of the individual pictures of the movie film which are thereby brought about.
- the distance window has a platen with black or black-coloured material and sliding stems made from glass carbon (in particular from Sigradur K. glass carbon) which are positioned on it and run parallel to one another in the film transport direction.
- the sliding stems are preferably stuck on the platen.
- the durability and precise alignment of the sliding stems is further increased.
- a secure connection between the sliding stems and the platen is thereby ensured even with materials with different heat expansion coefficients, and all in all simple and cost-effective manufacture is also ensured.
- the platen can be inserted in a locking way into the distance window, in such a way that platens of differing kinds can be used for differing film types and/or for differing shooting conditions.
- the distance window is formed as a component of a drive module of the movie camera and can he easily tilted and removed from the drive module as well as being connected to it
- FIG. 1 a side view of a camera case of a movie camera with an opened camera door and a film cassette placed on the camera case;
- FIG. 2 a perspective blown-up representation of a distance window with a film guide and completely flat platen
- FIG. 3 a perspective blown-up representation with a platen with a sliding stem positioned at right angles to the film guiding direction;
- FIG. 4 a perspective blown-up representation with a platen with two sliding stems positioned at right angles to the film guiding direction;
- FIG. 5 a rear-side view of a platen
- FIG. 6 a partially cut top view of the platen according to FIG. 5 with five guiding stems positioned in the film guiding direction;
- FIG. 7 a front side view of the platen according to FIGS. 5 and 6;
- FIG. 8 a section through the platen according to FIG. 7 along the line A-A;
- FIG. 9 an enlarged representation of the area X of a sliding stem receiving point of the platen according to FIG. 8;
- FIG. 10 a section through the platen according to FIG. 7 along the line B-B.
- FIG. 1 shows a side view of a movie camera with a camera case 1 with a film cassette 2 , whereby the film transport mechanism 4 thereof which is formed as a drive module is visible when the camera door is opened
- the film transport mechanism has a film transport motor, which is connected to a gripper mechanism, which transports the movie film 6 intermittently in a film guide, which in the region of the drive module is formed as a distance window 5 , where the individual film pictures are positioned for the purpose of exposure in front of a picture gate positioned in the shooting path of rays 3 .
- the distance window 5 contains—besides the picture gate 52 determining the area of the individual film pictures of the movie film to be exposed—a platen 7 a facing the back side of the movie film, a thrust pad 8 a pressing the platen 7 a on to the movie film and side film guiding walls 53 , 54 with grooves and recesses 55 for receiving the gripper points of the transport and locking grippers connected to the film transport motor.
- the distance window 5 ensures that the movie film 6 is moved in a fixed focusing plane behind the picture gate 52 in such a way as to ensure a constant support dimension between the picture plane and the securing of the camera lens. This is brought into effect through the platen 7 a and the thrust pad 8 a , which are connected to each other through pressure springs 91 , 92 in such a way that the platen 7 a is pressed onto the back layer of the movie film with a constant-remaining pressure.
- the thrust pad 8 a itself is connected to a swivel mechanism in a way which is not described in further detail, whereby this swivel mechanism is formed as part of the film transport module.
- the platen 7 a is formed as a completely flat plate, which according to the invention consists of black, non-reflecting or light-absorbing material and/or a corresponding layer or colouring.
- FIG. 3 shows a platen 7 b with a sliding stem 77 made from Sigradur K. glass carbon and running at right angles to the film guiding direction, and which by means of a thrust pad 8 b suited to the configuration of the sliding stem 77 lien on the back layer of a movie film.
- FIG. 4 shows a platen 7 c with two sliding stems 78 , 79 made from Sigradur K. glass carbon, which run parallel to one another and at right angles to the film guiding direction, and which are connected through an intermediate plate 7 d and three bores and corresponding connecting screws to a thrust pad 8 c and are pressed on to the back layer of a movie film.
- the platen 7 shown in FIGS. 2 to 7 in different views, sections and individual component representations consists of a thrust pad 71 , a mounting support 72 , a grip 73 and several—five in the present embodiment—sliding stems 74 facing the back side of the movie film, which are long and are positioned parallel to one another and which run in the transport or film guiding direction of the movie film 6 .
- these sliding stems 74 are put into hollows 76 of the mounting support 72 and are stuck to the mounting support 72 , preferably with a dual component sticker
- the sliding stems 74 are made from Sigradur K. glass carbon, whereby the flattened upper surfaces 75 of the sliding stems 74 lying on the back side of the film are grinded and/or polished, in order to achieve a further reduction in the friction of the movie film 6 sliding along on the guiding stems 74 .
- the platen 7 which consists of a ray-absorbing or non-reflecting material and/or the upper surface 70 of the platen 7 receiving the sliding stems 74 , is covered with a dark, preferably black, material, for example sprayed with a corresponding colour. It is also within the scope of the present invention for the entire distance window 5 , i.e. the picture gate, the side stems and the platen 7 , to consist of a ray-absorbing or non-reflecting material.
- the sliding stems 74 are provided with bevels 11 , 12 , and additional radiuses on the ends of the sliding stems 74 ensure a low-friction guiding of the movie film 6 and a careful guiding of the movie film 6 . In addition, reflections on the edges of the sliding stems 74 are avoided.
- the mounting support 72 is partially cut behind, in such a way that there is an elastic area of the mounting support 72 on the thrust pad 71 .
- sliding stems positioned in the film guiding direction or at right angles to the film guiding direction on a platen
- these sliding stems can also be secured on the platen in an inclining way, in particular running diagonally to the film guiding direction, or they can be manufactured in a one component way from the platen in such a way that they are an integral component of the platen.
- Combinations of sliding stems running at right angles and diagonally or longitudinally to the film guiding direction are also within the scope of the present invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Endoscopes (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Studio Devices (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
Description
- This application claims priority of German Application No. 198 60 712.1 filed Dec. 23, 1998, a copy of which is Attachment A hereto, the disclosure of which is incorporated fully herein by reference.
- The invention relates to a film guide for a movie camera according to the introductory clause of
claim 1. - Film guides for movie films in movie cameras have a distance window positioned in the optical path of rays of the shooting lens of the movie camera, whereby this distance window consists of a picture gate, which determines the size of the area of the individual pictures of the movie film to be exposed, side walls running in the longitudinal direction of the movie film and bordering on the side edges of the movie film, and a platen lying opposite the picture gate, whereby the movie film is moved between these components. Picture gate, platen and side walls thus form a film guiding channel, which fixes the movie film in a picture plane in such a way as to ensure a constant support dimension, i.e. a constant-remaining focusing plane for the movie film during film transport. In the side stems there are grooves or bores for receiving the gripper points as well as possibly a locking gripper of a film transport mechanism for film transport and for ensuring a picture standing position.
- Movie films generally consist of an underlay made of triacetate or polyester with high breaking strength and dimensional stability both with normal picture speeds and very high picture speeds, a light-sensitive emulsion applied to one side of the underlay (the front side of the movie film), whereby this emulsion is covered externally by a protective layer, and a back layer or sliding layer applied to the other side of the underlay, whereby this layer is generally formed in an anti-static way for the purpose of avoiding static flashes on the movie film.
- Fundamentally, due to reflections of the shooting rays which arise on the platen, which lies on the back layer of the movie film, undesired changes are brought about in the picture content of the individual pictures of the movie film, which in certain shooting conditions make film-shooting inefficient. This effect occurs in particular with films without an anti-halo layer as well as with black and white films and infra-red films. It is intensified in that in many applications the platen has so-called sliding stems for the purpose of reducing the friction on the movie film, whereby these sliding stems can extend in the movement direction of the movie film or at right angles or diagonally to the movement direction and lie on the back layer of the movie film, in such a way that at these points there is a stronger reflection than on the actual platen, which is reproduced in the picture content as a lattice structure.
- It is an object of the present invention to create a film guide with a distance window of the type mentioned above, which ensures exact guiding of the movie film in the picture or focusing plane with minimal friction between the movie film and the film guide and which excludes or minimises changes in the picture content due to ray reflections on the platen.
- This object is achieved according to the invention through the characteristics of
claim 1. - The solution according to the invention ensured the maintaining of minimal friction of the movie film in the film guide of the distance window, while ensuring exact guiding of the movie film in the region of the picture plane or focusing plane, and while avoiding reflections of the shooting path of rays on the platen as well as distortions of the picture content of the individual pictures of the movie film which are thereby brought about.
- Advantageous embodiments of the solution according to the invention can be derided from the characteristics of the sub-claims. In particular, it is advantageous it the distance window has a platen with black or black-coloured material and sliding stems made from glass carbon (in particular from Sigradur K. glass carbon) which are positioned on it and run parallel to one another in the film transport direction.
- For the purpose of easy and cost-effective manufacturing as well as long durability, the sliding stems are preferably stuck on the platen. Through the positioning of the sliding stems in hollows of the platen which run in the longitudinal direction at the film transport, the durability and precise alignment of the sliding stems is further increased. A secure connection between the sliding stems and the platen is thereby ensured even with materials with different heat expansion coefficients, and all in all simple and cost-effective manufacture is also ensured.
- Through bevelling the sliding stems at their ends, it is ensured that the movie film is not damaged before it enters the region of the distance window or after leaving the distance window. In addition, it is ensured that no reflections can arise on sharp edges
- Preferably the platen can be inserted in a locking way into the distance window, in such a way that platens of differing kinds can be used for differing film types and/or for differing shooting conditions.
- It is particularly advantageous if the distance window is formed as a component of a drive module of the movie camera and can he easily tilted and removed from the drive module as well as being connected to it
- By reference to an embodiment shown in the drawings, the thought behind the invention will now he explained in greater detail. The drawings show:
- FIG. 1—a side view of a camera case of a movie camera with an opened camera door and a film cassette placed on the camera case;
- FIG. 2—a perspective blown-up representation of a distance window with a film guide and completely flat platen;
- FIG. 3—a perspective blown-up representation with a platen with a sliding stem positioned at right angles to the film guiding direction;
- FIG. 4—a perspective blown-up representation with a platen with two sliding stems positioned at right angles to the film guiding direction;
- FIG. 5—a rear-side view of a platen;
- FIG. 6—a partially cut top view of the platen according to FIG. 5 with five guiding stems positioned in the film guiding direction;
- FIG. 7—a front side view of the platen according to FIGS. 5 and 6;
- FIG. 8—a section through the platen according to FIG. 7 along the line A-A;
- FIG. 9—an enlarged representation of the area X of a sliding stem receiving point of the platen according to FIG. 8; and
- FIG. 10—a section through the platen according to FIG. 7 along the line B-B.
- FIG. 1 shows a side view of a movie camera with a
camera case 1 with a film cassette 2, whereby the film transport mechanism 4 thereof which is formed as a drive module is visible when the camera door is opened The film transport mechanism has a film transport motor, which is connected to a gripper mechanism, which transports the movie film 6 intermittently in a film guide, which in the region of the drive module is formed as adistance window 5, where the individual film pictures are positioned for the purpose of exposure in front of a picture gate positioned in the shooting path of rays 3. - According to FIG. 2, the
distance window 5 contains—besides thepicture gate 52 determining the area of the individual film pictures of the movie film to be exposed—aplaten 7 a facing the back side of the movie film, a thrust pad 8 a pressing theplaten 7 a on to the movie film and sidefilm guiding walls recesses 55 for receiving the gripper points of the transport and locking grippers connected to the film transport motor. - The
distance window 5 ensures that the movie film 6 is moved in a fixed focusing plane behind thepicture gate 52 in such a way as to ensure a constant support dimension between the picture plane and the securing of the camera lens. This is brought into effect through theplaten 7 a and the thrust pad 8 a, which are connected to each other throughpressure springs platen 7 a is pressed onto the back layer of the movie film with a constant-remaining pressure. The thrust pad 8 a itself is connected to a swivel mechanism in a way which is not described in further detail, whereby this swivel mechanism is formed as part of the film transport module. - In FIG. 2, the
platen 7 a is formed as a completely flat plate, which according to the invention consists of black, non-reflecting or light-absorbing material and/or a corresponding layer or colouring. - FIG. 3 shows a
platen 7 b with asliding stem 77 made from Sigradur K. glass carbon and running at right angles to the film guiding direction, and which by means of a thrust pad 8 b suited to the configuration of thesliding stem 77 lien on the back layer of a movie film. - FIG. 4 shows a platen7 c with two
sliding stems intermediate plate 7 d and three bores and corresponding connecting screws to a thrust pad 8 c and are pressed on to the back layer of a movie film. - The
platen 7 shown in FIGS. 2 to 7 in different views, sections and individual component representations consists of athrust pad 71, amounting support 72, agrip 73 and several—five in the present embodiment—sliding stems 74 facing the back side of the movie film, which are long and are positioned parallel to one another and which run in the transport or film guiding direction of the movie film 6. According to FIG. 6, thesesliding stems 74 are put intohollows 76 of themounting support 72 and are stuck to themounting support 72, preferably with a dual component sticker - The
sliding stems 74 are made from Sigradur K. glass carbon, whereby the flattenedupper surfaces 75 of thesliding stems 74 lying on the back side of the film are grinded and/or polished, in order to achieve a further reduction in the friction of the movie film 6 sliding along on the guidingstems 74. - The
platen 7 which consists of a ray-absorbing or non-reflecting material and/or theupper surface 70 of theplaten 7 receiving thesliding stems 74, is covered with a dark, preferably black, material, for example sprayed with a corresponding colour. It is also within the scope of the present invention for theentire distance window 5, i.e. the picture gate, the side stems and theplaten 7, to consist of a ray-absorbing or non-reflecting material. - The ray-absorbing
upper surface 70 of theplaten 7 in association with thesliding stems 74 consisting of Sigradur K. glass carbon prevents a reflection of the shooting rays on thedistance window 5 and thus a corresponding distortion of the picture content of the individual pictures of the movie film 6. - In the region of entry and exit of the movie film6 in the
distance window 5, according to FIG. 7 thesliding stems 74 are provided withbevels sliding stems 74 ensure a low-friction guiding of the movie film 6 and a careful guiding of the movie film 6. In addition, reflections on the edges of thesliding stems 74 are avoided. - As can be seen in particular from the section through the
distance window 5 according to FIG. 7, themounting support 72 is partially cut behind, in such a way that there is an elastic area of themounting support 72 on thethrust pad 71. - As an alternative to the above-described sliding stems positioned in the film guiding direction or at right angles to the film guiding direction on a platen, these sliding stems can also be secured on the platen in an inclining way, in particular running diagonally to the film guiding direction, or they can be manufactured in a one component way from the platen in such a way that they are an integral component of the platen. Combinations of sliding stems running at right angles and diagonally or longitudinally to the film guiding direction are also within the scope of the present invention.
- Furthermore, positioning of the sliding stems themselves in a sprung way in the platen is possible, and connection thereof directly to the thrust pad or to a formation as part of the thrust pad.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19860712 | 1998-12-23 | ||
DE19860712.1 | 1998-12-23 | ||
DE19860712A DE19860712A1 (en) | 1998-12-23 | 1998-12-23 | Film guide for a motion picture camera |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020021413A1 true US20020021413A1 (en) | 2002-02-21 |
US6457827B1 US6457827B1 (en) | 2002-10-01 |
Family
ID=7893118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/470,932 Expired - Fee Related US6457827B1 (en) | 1998-12-23 | 1999-12-22 | Film guide for a movie camera |
Country Status (4)
Country | Link |
---|---|
US (1) | US6457827B1 (en) |
EP (1) | EP1014163B1 (en) |
AT (1) | ATE232610T1 (en) |
DE (2) | DE19860712A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6742896B2 (en) * | 2001-05-15 | 2004-06-01 | Disney Enterprises, Inc. | Film trap and gate assembly for a motion picture projector |
US7189259B2 (en) | 2002-11-26 | 2007-03-13 | Clemson University | Tissue material and process for bioprosthesis |
US7393105B2 (en) * | 2004-02-04 | 2008-07-01 | Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg | Film guide for a movie camera |
DE502004008553D1 (en) * | 2004-02-04 | 2009-01-08 | Arnold & Richter Kg | FILM GUIDANCE FOR A RUNNING CAMERA |
USD1008344S1 (en) * | 2021-07-30 | 2023-12-19 | Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg | Mount for camera or camera accessory |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1404707A (en) * | 1919-11-24 | 1922-01-24 | Silent Drama Syndicate | Film gate for kinetograph mechanism |
US3103861A (en) * | 1958-12-19 | 1963-09-17 | Adox Kamerawerk G M B H | Pressure plate assembly for cameras or magazines |
US3479114A (en) * | 1967-12-28 | 1969-11-18 | Technical Operations Inc | Intermittent film contact pressure apparatus for cinematographic cameras |
US3833292A (en) | 1971-03-25 | 1974-09-03 | O Blaschek | Motion picture camera comprising an externally attached detachable cassette |
US3954330A (en) * | 1971-11-17 | 1976-05-04 | Canon Kabushiki Kaisha | Film gate unit for motion picture apparatus |
DE2218793A1 (en) * | 1972-04-18 | 1973-10-31 | Braun Ag | FILM TOUR IN FILM UNITS |
US3912381A (en) * | 1973-12-26 | 1975-10-14 | Polaroid Corp | Photographic apparatus and method for locating film in a precise focal plane |
JPS58163939U (en) * | 1982-04-28 | 1983-11-01 | 富士写真フイルム株式会社 | film pressure plate |
US4522476A (en) * | 1984-06-25 | 1985-06-11 | Walter Renold | Motion picture film gate and registration system |
JPS6127527A (en) | 1984-07-17 | 1986-02-07 | Canon Inc | Pressure plate of camera |
DE8531946U1 (en) * | 1985-11-12 | 1986-01-16 | Arnold & Richter Cine Technik GmbH & Co Betriebs KG, 8000 München | Motion picture film recording camera |
FR2594965B1 (en) * | 1986-02-24 | 1988-09-16 | Aaton Rgo | DEVICE FOR GUIDING A FILM IN A CINEMATOGRAPHIC CAMERA |
DE4013909A1 (en) * | 1990-04-26 | 1991-10-31 | Arnold & Richter Kg | IMAGE WINDOW FOR MOTORCYCLE CAMERAS |
JPH04362621A (en) | 1991-06-11 | 1992-12-15 | Kyocera Corp | Pressure plate for camera made of ceramics |
-
1998
- 1998-12-23 DE DE19860712A patent/DE19860712A1/en not_active Withdrawn
-
1999
- 1999-12-22 AT AT99250444T patent/ATE232610T1/en not_active IP Right Cessation
- 1999-12-22 DE DE59904270T patent/DE59904270D1/en not_active Expired - Lifetime
- 1999-12-22 EP EP99250444A patent/EP1014163B1/en not_active Expired - Lifetime
- 1999-12-22 US US09/470,932 patent/US6457827B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE232610T1 (en) | 2003-02-15 |
DE19860712A1 (en) | 2000-07-13 |
US6457827B1 (en) | 2002-10-01 |
DE59904270D1 (en) | 2003-03-20 |
EP1014163B1 (en) | 2003-02-12 |
EP1014163A1 (en) | 2000-06-28 |
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