EP0690346B1 - Dispositif de gravure d'un film cinématographique par faisceau laser - Google Patents

Dispositif de gravure d'un film cinématographique par faisceau laser Download PDF

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Publication number
EP0690346B1
EP0690346B1 EP95401497A EP95401497A EP0690346B1 EP 0690346 B1 EP0690346 B1 EP 0690346B1 EP 95401497 A EP95401497 A EP 95401497A EP 95401497 A EP95401497 A EP 95401497A EP 0690346 B1 EP0690346 B1 EP 0690346B1
Authority
EP
European Patent Office
Prior art keywords
film
motor
image
defects
laser beam
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 - Lifetime
Application number
EP95401497A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0690346A1 (fr
Inventor
Jean-Pierre Blauwblomme
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.)
CMC Cinema Magnetique Communication
Original Assignee
CMC Cinema Magnetique Communication
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 CMC Cinema Magnetique Communication filed Critical CMC Cinema Magnetique Communication
Publication of EP0690346A1 publication Critical patent/EP0690346A1/fr
Application granted granted Critical
Publication of EP0690346B1 publication Critical patent/EP0690346B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C11/00—Auxiliary processes in photography
    • G03C11/02—Marking or applying text

Definitions

  • the present invention relates to a device for engraving a film by laser beam, including a drive and servo installation positional of the film, in particular a cinematographic film. It's about submitting the film alternately in training phases and at precise positioning or even stop phases, either to view the image, either during which subtitling can be engraved on the film, in places specific of the corresponding image.
  • the drive and positioning mechanism of the film is of the type known as "with claws and with claws".
  • a high torque, low inertia electric motor controlled by a computer causes claws to rotate through a rotating central block in which they can slide radially, these claws, when they are in the extracted position, engaging with the perforations of the film to train it.
  • the training of film is made on a half cycle, or a half turn. On the second half of the cycle, the claws enter the block central, and the counter-claws come out to "trample" the film, that is to say to keep it in a position precise, both laterally and in the direction of film scrolling.
  • the object of the present invention is to allow a much faster film scrolling while increasing very noticeably the precision of its positioning, whether the film is stopped or running, in particular in the case where, during this positioning, we proceed, on the corresponding images of the film, with an engraving of subtitles by scanning a LASER beam.
  • the present invention relates to a device for engraving a film by a laser beam comprising a system X-Y optical deflection deflectors to control the movement of the laser beam, this system itself being under the control of a computer with subtitles in memory, the device including a position and drive servo installation film, characterized in that said installation comprises: a motor controlled by said computer and suitable for putting the film in continuous scrolling but with possibly interruptions for the engraving of said subtitles; a debtor with essentially cylindrical surface comprising teeth for the drive of said film and coupled to said motor; a device for storing defects of concentricity of said debtor, which defects come from the deviation of the debtor's axis of rotation from the longitudinal axis of cylindrical symmetry of the debtor; and a compensation system between said memory device and said optical deflection system, for correction, depending of said defects, of the position of the etching laser beam, so that each subtitle has exactly the desired position in relation to the image concerned of the film, notwithstanding said defects, inherent in each
  • the impact coordinates of the LASER beam are adjusted according to from any position of the image. It also means that two burning modes are possible with such a mechanism: an image engraving by image and continuous engraving, i.e. without stopping of the film, the displacement of the LASER beam then having a component of equal speed and in the same direction as the film speed.
  • such a device comprises in in addition to a digital encoder fixed on the motor shaft, this encoder being consequently able to provide said system of compensation a signal representative of the angular position motor shaft, i.e. its positioning error angular, this error being added to or subtracting from the film positioning error due to Defects in the debtor's eccentricity, to obtain a global positioning error sent to said control of said deflectors.
  • Enslaving the drive motor of the debtor eliminates any mechanical system already known as that of the "Maltese cross" and ensuring the continuity of film scrolling.
  • the motor control in position allows wedge each of the images which must receive an engraving, by example a subtitle, compared to the normal position of the LASER beam, i.e. its position before any corrective deviation.
  • the enslavement of motor speed allows to adapt this speed to the number images without engraving, so as to increase by example engine speed if two captioned images are separated by a large number of non-captioned images, and on the contrary to decrease this speed if there is only one small number of consecutive images without subtitles.
  • Film positioning errors are the resulting from two phenomena arising from defects in debtor geometry and position errors specific to the path. These phenomena are treated simultaneously by the aforementioned compensation system, which communicates to the X-Y optical deflection system the corrections to be made to the reference coordinates.
  • Defects in debtor geometry are essentially concentricity defects, hence a decentralization of its periphery, preventing that there is a unique relationship between the angle of rotation of this debtor and the position linear of the image. These geometric defects are easily quantifiable, and necessary corrections can be easily entered as parameters of compensation in the LASER beam deflection system, as will be seen in more detail below, this by setting work of a test pattern.
  • the invention also includes provisions mechanical, related to the fact that the film engraving course may have a scrolling speed much more important than when it is driven by classic mechanisms.
  • the film must be perfectly linear in the engraving area.
  • the classic claw and counter-claw mechanisms the flatness of the film is ensured by a flat channel provided with a presser.
  • a presser is a source of problems because the pressure it exerts on the film is not constant and it is even random in depending on the nature of the films, hence instability in great speed.
  • the possibilities offered by the new mechanism of the present invention, in particular in film fast transport material make the system to flat channel and obsolete presser.
  • Figure 1 there is shown by way of example, on a graph x, y, a possible concentricity defect of the - theoretically cylindrical - debtor of film, such as referenced 1 in Figure 2.
  • a possible concentricity defect of the - theoretically cylindrical - debtor of film such as referenced 1 in Figure 2.
  • the direction of rotation of the debtor is represented by arrow 4.
  • each frame R1, R2 and R3 is shifted differently by compared to the "offset 0" position it would have if the debtor 1 had perfect geometry.
  • These shifts measured by an encoder C associated with the drive motor M of the debtor (see Figures 4 and 5), can then be used to correct the position of the LASER beam when burning a subtitle (action on the deflector control system S), and ensure thus the compensation required so that each subtitle is exactly and precisely positioned in relation to the image corresponding.
  • the setting of the compensation system V for this point n 1 is done by storing in a "table of geometric errors" T (see figure 4 ), of the measured value with a sign assignment so that the deviation system offset is adjusted in the correct direction. For this example, we consider that the sign is negative.
  • the mechanism stops to make the first engraving.
  • Vro -n 1 - (- ⁇ )
  • the compensation system V supplies this value V ro to the deflector control system S (FIG. 4), and the engraving of the first image begins.
  • the value of Vro changes and the compensation system V starts again the analysis of the information it receives; this analysis begins again for each image to be engraved.
  • the compensation system V is inoperative.
  • the present invention will achieve that the film movement speed no longer depends on the mechanisms positioning of the images, but only of the engine M, with a large decrease in constraints on the film. Scroll speeds of the film, and therefore the speed of the engraving, can therefore be much more important than with the mechanisms classics; it is estimated that the frame rate of the film could be multiplied by at least four, or 200 prints per second or more. This result leads to adopt an engraving medium different from current supports, for avoid friction of a presser on the film at the location which the engraving requires that the film have a flat or at least linear surface.
  • the invention will make it possible to obtain a reduction manufacturing cost due to the decrease in mechanical manufacturing tolerances, as well as a decrease the number of maintenance operations due to the virtual disappearance of mechanical adjustments.

Landscapes

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)
  • Laser Beam Printer (AREA)
  • Lasers (AREA)
  • Projection-Type Copiers In General (AREA)
  • ing And Chemical Polishing (AREA)
  • Camera Data Copying Or Recording (AREA)
  • Drying Of Semiconductors (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Replacement Of Web Rolls (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP95401497A 1994-06-27 1995-06-23 Dispositif de gravure d'un film cinématographique par faisceau laser Expired - Lifetime EP0690346B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9407876A FR2721723B1 (fr) 1994-06-27 1994-06-27 Installation d'entraînement et de positionnement d'un film, en particulier en cours de gravure par faisceau laser.
FR9407876 1994-06-27

Publications (2)

Publication Number Publication Date
EP0690346A1 EP0690346A1 (fr) 1996-01-03
EP0690346B1 true EP0690346B1 (fr) 2000-10-11

Family

ID=9464690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95401497A Expired - Lifetime EP0690346B1 (fr) 1994-06-27 1995-06-23 Dispositif de gravure d'un film cinématographique par faisceau laser

Country Status (10)

Country Link
US (1) US5835385A (zh)
EP (1) EP0690346B1 (zh)
JP (1) JPH08150489A (zh)
CN (1) CN1053971C (zh)
AT (1) ATE196952T1 (zh)
DE (1) DE69519059T2 (zh)
DK (1) DK0690346T3 (zh)
ES (1) ES2151586T3 (zh)
FR (1) FR2721723B1 (zh)
PT (1) PT690346E (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154237B1 (es) * 1999-08-06 2001-10-01 Consejo Superior Investigacion Modificacion total o parcial de superficies ceramicas, sin variar sus caracteristicas funcionales, mediante radiacion laser.
FR2855884B1 (fr) * 2003-06-04 2005-08-19 Monal Systems Mecanisme pour la gravure par un faisceau laser de sous-titres simultanement sur une ou plusieurs images d'un film cinematographique

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398223A (en) * 1955-06-14 1983-08-09 Lemelson Jerome H System for recording video information on a record card
US3636838A (en) * 1969-04-04 1972-01-25 Ibm Beam motion compensation in optical image transfer systems having moving parts
GB2036369B (en) * 1978-12-13 1982-11-10 Ornsby Co Ltd Sub-titling cinematograph films
US4511930A (en) * 1981-04-24 1985-04-16 Lemelson Jerome H Electro-optical information recording and reproduction system
FR2580548B1 (fr) * 1985-04-19 1987-06-26 Cinema Magnetique Communicatio Films marques, procede et appareil pour le marquage de films
DE3802538A1 (de) * 1987-01-28 1988-08-11 Olympus Optical Co Vorrichtung zum erfassen von fotomagnetischen signalen
EP0282611A1 (en) * 1987-03-16 1988-09-21 Moshe Guez Method and apparatus for writing information on processed photographic film
US5489986A (en) * 1989-02-28 1996-02-06 Nikon Corporation Position detecting apparatus
DK69492D0 (da) * 1992-05-26 1992-05-26 Purup Prepress As Apparat til exponering af et medie, apparat til punktexponering af et medie, samt en indretning til fastholdelse af et medie
JPH06177013A (ja) * 1992-12-10 1994-06-24 Canon Inc 位置検出装置
US5510893A (en) * 1993-08-18 1996-04-23 Digital Stream Corporation Optical-type position and posture detecting device

Also Published As

Publication number Publication date
US5835385A (en) 1998-11-10
FR2721723B1 (fr) 1996-09-20
FR2721723A1 (fr) 1995-12-29
ATE196952T1 (de) 2000-10-15
PT690346E (pt) 2001-03-30
JPH08150489A (ja) 1996-06-11
CN1053971C (zh) 2000-06-28
DK0690346T3 (da) 2001-01-02
DE69519059D1 (de) 2000-11-16
ES2151586T3 (es) 2001-01-01
EP0690346A1 (fr) 1996-01-03
DE69519059T2 (de) 2001-05-10
CN1115869A (zh) 1996-01-31

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