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US 5,603,560 AGranted
Projection apparatus
AssigneeCanon Kabushiki Kaisha
InventorYasutsugu Saijo
Life of this patent
Estimating the term…
Abstract
A projection apparatus comprises an illumination device for emitting onto a film an illumination light for projecting the film, an index member for focus adjustment, a moving mechanism for moving the index member to a focus adjusting position where the index member is in contact with a surface of the film within an optical path of the projection light, and a member to be operated for focus adjustment.
Claims15
A projection apparatus or film projection system, comprising:
- a) illumination means for emitting onto a film a projection light for projecting an image on the film;
- b) an index member for focus adjustment;
- c) moving means for moving said index member to a focus adjusting position where said index member is in contact with a surface of the film within an optical path of the projection light, wherein said moving means is arranged to cause said index member to enter the optical path of the projection light while being out of contact with the film and to bring said index member into contact with the surface of the film by moving said index member approximately perpendicularly to the surface of the film;
- and
- d) focus adjusting means to be operated for focus adjustment of an image of said index member.
2 more elements
A projection apparatus comprising:
- a) illumination means for emitting onto a film a projection light for projecting an image of the film;
- and
- b) a film holding member for holding the film having a plurality of frames with a length in a longitudinal direction and a length in a transverse direction which is less than the length in the longitudinal direction, said film holding member having a first length in the longitudinal direction which is longer than the length of the film in the longitudinal direction and comprising a first planar portion and a second planar portion, each of which has a second length in a transverse direction which is longer than the length of the film in the transverse direction,
- said first and second planar portions being pivotably connected to each other at one side and sandwiching the film therebetween, said first planar portion being provided at predetermined intervals with a plurality of restriction portions, each of which corresponds to a frame of the film, for restricting movement of the film in the transverse direction, each said restriction portion being provided with a first extrusion and a second extrusion facing each other and spaced at predetermined distances in the longitudinal direction, with
- one of said first and second extrusions being provided with an extended portion extending in a transverse direction from said extrusion, with the length of said extended portion being no longer than the length of said extrusion.
2 more elements
A film holding member for use in a projection apparatus for emitting projection light onto a film by illumination means, comprising:
- first and second planar portions pivotably connected for holding therebetween a film having a plurality of frames and a length in a longitudinal direction and a length in a transverse direction that is less than the length in the longitudinal direction, with the film being set on said first planar portion when said first and second planar portions are separated from each other by a predetermined amount, and holding the film after being set between said first and second planar portions, with said planar portions having a first length in a longitudinal direction that is longer than the length of the film in the longitudinal direction and a second length in the transverse direction that is longer than the length of the film in the transverse direction,
- said first planar portion being provided at predetermined intervals with a plurality of restriction portions, each of which corresponds to a frame of the film, for restricting movement of the film in the transverse direction, each said restriction portion being provided with a first extrusion and second extrusion facing each other located at spaced distances in the longitudinal direction,
- one of said first and second extrusions being provided With an extended portion extending in a transverse direction from said extrusion, with a length of said extended portion being no longer than the length of said extrusion.
A film holding member for use in a projection apparatus for emitting projection light onto a film by illumination means, comprising:
- first and second planar portions rotatably connected at one end so as to rotate a predetermined angle from a face-to-face state to an open state;
- and
- a film positioning member provided on said first planar portion, wherein a maximum angle of rotation of said first and second planar portions when they are in an open state is determined by the length of the film positioning member extending from said first planar portion.
A projection apparatus or film projection system, comprising:
- a) illumination means for emitting onto a film projection light for projecting an image on the film;
- b) an index member for focus adjustment;
- c) moving means for moving said index member from exterior of an optical path of the projection light to a focus adjusting position within the optical path;
- and
- d) prevention means for preventing movement of said index member to the focus adjusting position by said moving means when the film is not at a film projectable position.
2 more elements
Dependencies are inferred from the claim text.