公开(公告)号：WO1992008162A1

公开(公告)日：1992-05-14

申请号：PCT/CA1991000279

申请日：1991-08-12

Applicant: IMAX CORPORATION

Inventor： IMAX CORPORATION ,  SHAW, William, C. ,  MAXWELL, Ian ,  SMITH, Irvine, W.

IPC: G03B01/18

CPC classification number: G03B1/18 ,  G03B1/22

Abstract: A projector having a rolling loop film transport mechanism is provided with a film decelerating cam unit (52) that is located in advance of the aperture of the projector. Deceleration pins (66) carried by a pair of vertically spaced arms (62) that project from the cam unit, engage in upper and lower marginal perforations in the film and travel with the film towards the aperture and decelerate the film as each frame is advanced. The cam unit includes two cams (56, 58), one of which causes the decelerating motion of the pins, and a return motion in the reverse direction, while the other cam (58) causes the pins to advance and retract into and from the film path respectively. By positively retracting the pins, their return movement against the direction of film travel can take place independent of the motion of the film. As compared with the prior art, acceleration forces and resultant stresses on the cam are reduced and the cam unit can operate at higher frame rates and/or with smaller rotor gaps.

公开(公告)号：EP1070278A1

公开(公告)日：2001-01-24

申请号：EP99908705.9

申请日：1999-03-17

Applicant: IMAX CORPORATION ,  KINOTON GmbH

Inventor： DOBLER, Christoph ,  MAXWELL, Ian

IPC: G03B21/32

CPC classification number: G03B21/32

Abstract: A reel unit for supply and take-up of film from at least one motion picture projector includes an upright support column (42) and a plurality of film platter-support arms (44, 46, 48, 50 and 52) that extend generally horizontally from the column at vertically spaced positions. The arms are alternately offset laterally from one another to facilitate access to film on platters (P) below the top arm. Each arm carries a platter drive hub (70) provided with upwardly projecting drive pins (78) that engage in openings (34) in the platter so that the platter can be lifted off the arm. This allows the platters to be interchanged between different arms. Film take-up and pay-out cores can be interchangeably mounted on the platters so that any one platter can serve as a supply platter or a take-up platter irrespective of its position on the column. For the same reason, the column carries, in association with each arm, a set of rollers for guiding film being paid out from a platter on that arm or being wound onto the platter.

Abstract translation: 用于从至少一个电影放映机供应和卷取胶片的卷轴单元包括直立支撑柱（42）和多个大致水平延伸的胶片支撑臂（44,46,48,50和52） 从垂直间隔位置的列中。 这些臂彼此交替地侧向偏移，以便于在顶臂下面的盘片（P）上访问胶片。 每个臂带有一个设置有向上突出的驱动销（78）的盘驱动轮毂（70），该驱动销接合盘片中的开口（34），从而可以将盘片从该臂上抬起。 这可以使盘片在不同的手臂之间互换。 薄膜卷取和取出芯可以互换地安装在盘片上，这样任何一张盘片都可以作为供料盘或卷取盘，而不管它在立柱上的位置。 出于同样的原因，所述柱与每个臂相关联地承载用于引导胶片的一组辊子，所述辊子从所述臂上的盘片中被放出或被卷绕在所述盘片上。

公开(公告)号：EP0555224B1

公开(公告)日：1994-11-09

申请号：EP91914524.3

申请日：1991-08-12

Applicant: IMAX CORPORATION

Inventor： SHAW, William, C. ,  MAXWELL, Ian ,  SMITH, Irvine, W.

IPC: G03B1/18

CPC classification number: G03B1/18 ,  G03B1/22

Abstract: A projector having a rolling loop film transport mechanism is provided with a film decelerating cam unit (52) that is located in advance of the aperture of the projector. Deceleration pins (66) carried by a pair of vertically spaced arms (62) that project from the cam unit, engage in upper and lower marginal perforations in the film and travel with the film towards the aperture and decelerate the film as each frame is advanced. The cam unit includes two cams (56, 58), one of which causes the decelerating motion of the pins, and a return motion in the reverse direction, while the other cam (58) causes the pins to advance and retract into and from the film path respectively. By positively retracting the pins, their return movement against the direction of film travel can take place independent of the motion of the film. As compared with the prior art, acceleration forces and resultant stresses on the cam are reduced and the cam unit can operate at higher frame rates and/or with smaller rotor gaps.

公开(公告)号：EP0897555B1

公开(公告)日：2003-08-06

申请号：EP97917961.1

申请日：1997-05-06

Applicant: IMAX CORPORATION

Inventor： GIBBON, Michael, A. ,  MAXWELL, Ian ,  TOPORKIEWICZ, Marian

IPC: G03B1/42

CPC classification number: G03B1/18 ,  G03B1/42

Abstract: A compact rolling loop motion picture projector has a rotor of significantly smaller diameter than a conventional such rotor. The radius of curvature of the rotor is selected to be significantly less than the radius of curvature of a film flattener element on which the film is located for projection, and the axis of rotation of the rotor is offset towards a film input sprocket of the projector so as to maintain a minimum film gap between the rotor and the field flattener usptream of the optical axis of the projector. The compact rotor is rotationally supported from above by a "spider" and a projection lamp is located below the rotor for compactness and efficiency of lamp operation.

公开(公告)号：EP0897555A1

公开(公告)日：1999-02-24

申请号：EP97917961.0

申请日：1997-05-06

Applicant: IMAX CORPORATION

Inventor： GIBBON, Michael, A. ,  MAXWELL, Ian ,  TOPORKIEWICZ, Marian

IPC: G03B19 ,  G03B1 ,  G03B21

CPC classification number: G03B1/18 ,  G03B1/42

Abstract: A compact rolling loop motion picture projector has a rotor of significantly smaller diameter than a conventional such rotor. The radius of curvature of the rotor is selected to be significantly less than the radius of curvature of a film flattener element on which the film is located for projection, and the axis of rotation of the rotor is offset towards a film input sprocket of the projector so as to maintain a minimum film gap between the rotor and the field flattener usptream of the optical axis of the projector. The compact rotor is rotationally supported from above by a 'spider' and a projection lamp is located below the rotor for compactness and efficiency of lamp operation.

公开(公告)号：EP1070278B1

公开(公告)日：2001-11-21

申请号：EP99908705.9

申请日：1999-03-17

Applicant: IMAX CORPORATION ,  KINOTON GmbH

Inventor： DOBLER, Christoph ,  MAXWELL, Ian

IPC: G03B21/32

CPC classification number: G03B21/32

Abstract: A reel unit for supply and take-up of film from at least one motion picture projector includes an upright support column (42) and a plurality of film platter-support arms (44, 46, 48, 50 and 52) that extend generally horizontally from the column at vertically spaced positions. The arms are alternately offset laterally from one another to facilitate access to film on platters (P) below the top arm. Each arm carries a platter drive hub (70) provided with upwardly projecting drive pins (78) that engage in openings (34) in the platter so that the platter can be lifted off the arm. This allows the platters to be interchanged between different arms. Film take-up and pay-out cores can be interchangeably mounted on the platters so that any one platter can serve as a supply platter or a take-up platter irrespective of its position on the column. For the same reason, the column carries, in association with each arm, a set of rollers for guiding film being paid out from a platter on that arm or being wound onto the platter.

公开(公告)号：EP1084448A2

公开(公告)日：2001-03-21

申请号：EP99915419.8

申请日：1999-04-21

Applicant: IMAX CORPORATION

Inventor： BAKER, Kenneth, T. ,  JACQUES, Eric ,  MAXWELL, Ian

IPC: G03B21/56 ,  G03B21/52 ,  G03B35/18 ,  G03B37/06

CPC classification number: G03B37/06 ,  G03B21/52 ,  G03B21/56 ,  G03B35/16 ,  H04N13/337 ,  H04N13/363

Abstract: An "immersive experience" motion picture theatre is provided either as a purpose-built structure or as a "retro-fit" of an existing domed theatre. The theatre of the invention has an audience seating deck (20) which slopes downwardly towards a screen (22) of part-cylindrical shape. The screen slopes upwardly and extends above the seating deck as well as wrapping around the sides of the seating deck. A projector (26) located within the seating deck (20) projects images onto the screen (22) about an upwardly oriented projection axis, through an orthographic fisheye lens which minimizes distortion of centre regions of the images. In this way, motion pictures that have been shot for showing on domed screens can be successfully projected onto the curved screen (22) of the invention.

公开(公告)号：EP0555224A1

公开(公告)日：1993-08-18

申请号：EP91914524.0

申请日：1991-08-12

Applicant: IMAX CORPORATION

Inventor： SHAW, William, C. ,  MAXWELL, Ian ,  SMITH, Irvine, W.

IPC: G03B1 ,  G03B21

CPC classification number: G03B1/18 ,  G03B1/22

Abstract: Projecteur à mécanisme de transport de film en boucle tournante sur lequel on monte une unité à cames de ralentissement du déroulement du film (52) à un endroit situé avant l'ouverture du projecteur. Des broches de ralentissement (66), supportées par une paire de bras espacés verticalement (62) qui dépassent de l'unité à cames, s'engagent dans les perforations marginales supérieures et inférieures du film et se déplacent avec le film en direction de l'ouverture tout en ralentissant le déroulement du film à chaque image. L'unité à cames comprend deux cames (56, 58), l'une provoquant le mouvement de ralentissement des broches et un mouvement de retour dans le sens opposé à celui du déroulement du film, tandis que l'autre (58) fait avancer les broches et les fait entrer et sortir respectivement du chemin du film. La rétraction positive des broches leur permet d'effectuer un mouvement de retour à l'encontre du sens de déroulement du film indépendamment du mouvement du film. Par comparaison aux systèmes existant à ce jour, les forces d'accélération et par conséquent les forces de résistance s'exerçant sur la came sont diminuées et l'unité à cames peut fonctionner à des cadences d'images plus élevées et/ou à des intervalles de rotor plus petits.