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US 3,938,886 AGranted
Slide projector controllable of its projection time
AssigneeCanon Kabushiki Kaisha
InventorsMasanori Uchidoi, Tateo Yamada
Life of this patent
Estimating the term…
Abstract
In a slide projector a plurality of slide films contained in a tray are successively selected and shifted to a projected position. A switch is provided which controls movement through a clutch to a running motor of each slide film between its tray-stored position and its projection position and also movement of the tray itself. This switch serves also as a switch for resetting a timer which holds each slide film in its projected position for any desired time.
Claims20
A slide film projector, comprising in combination:
- a. slide film supporting means for supporting a plurality of slides while supporting one of said slides in a ready position;
- b. slide film moving means for causing a slide film to move between said ready position and a projection position;
- c. means for driving said slide film moving means including a motor arranged for running without interruption in between a plurality of successive operations of said slide film moving means;
- d. means for programming movement of said slide film moving means, including:
- 1. slide film movement control means including a selectively connectable and disconnectable driving connection with said driving means, for causing said slide film moving means to operate sequentially in a predetermined cycle by receiving driving force from said driving means through said driving connection;
- 2. switching means, operatively connected with said control means, for disconnecting the driving connection of said control means with said driving means when a slide film is positioned at said projection position by said slide film moving means, and for maintaining the driving connection therebetween when no slide film is in said projection position;
- and
- 3. timer switch means, operatively connected to both said switching means and said control means, for governing the projection time of said slide film, said timer switch means being provided with selective setting means for setting a particular projection time for said slide film and having time measuring means responsive to said switching means for restoring the driving connection between said control means and said driving means upon lapse of the time set by said setting means, said timer switch means further having means for resetting said time measuring means to a beginning state in response to said switching means when said slide film is caused to shift from said projection position to said ready position by said slide film moving means, and
- e. means for shifting said slide film support means, between cycles of said slide film moving means, so as to bring different slides successively into said ready position.
6 more elements
A slide film projector for use with slide films pre-mounted in slides and pre-placed in a tray and loaded in the projector by means of the tray, both the tray and the slide film mountings being of predetermined dimensions and configuration, said projector comprising in combination:
- a. tray guiding means for accepting and guiding a tray which accommodates therein a plurality of slide films in such a manner that said tray is shiftable within said tray guiding means;
- b. optical projection means including a slide film projection station therein;
- c. means for moving said tray in said guiding means in such a manner that each of said slide films may be projected one by one;
- d. means for moving each of said slide films one by one between a position in which it is supported in said tray and said film projection station;
- e. a motor for supplying driving power both for said tray moving means and said slide moving means;
- f. means for sequentially actuating said tray moving means and said slide moving means, said actuating means being arranged to receive driving force from said motor upon its being operatively connected with said drive motor;
- g. means for selectively connecting and disconnecting said motor and said actuating means operatively, having a first state, wherein operative connection between said drive motor and said actuating means is possible, and a second state, wherein said operative connection between them is not possible and including electrical change-over means for producing a change-over from one of said states to the other;
- h. a first control switch for changing over said connecting means from said first state to said second state when said slide film is placed in said projection station by said slide film moving means and for setting and maintaining said connecting means in said first state, when said slide film is set in a position other than in said projection station;
- i. a timer circuit for controlling the projection time of said slide film, including means for setting a particular projection time for said slide film, and including time-measuring means, responsive to actuation by said first control switch when said control means causes said connecting means to change over from said first state to said second state, and for producing a predetermined output signal after measuring out said projection time;
- j. a second control switch responsive to the output signal from said time-measuring means of said timer circuit, for causing said connecting means to change over from said second state to said first state when said predetermined output signal is produced by said time-measuring means, and
- k. means for resetting said time-measuring means to an initial state thereof when said slide film is shifted from said projection station to said tray, said initial state being a state of readiness for again measuring out said projection time.
8 more elements
A slide film projector, comprising in combination:
- a. a removable tray for supporting a plurality of slide films in readiness;
- b. a tray guiding means for accepting said tray and guiding movement thereof in said projector;
- c. means for moving said tray in said tray guiding means in such a manner that each of a plurality of slide films accommodated in said tray may be projected one by one;
- d. optical projection means including a slide film projection station, a light source and an optical system for for projecting an image of said slide film;
- e. means for moving each of said slide films one by one between a position where said slide film is accommodated in said tray and a position where said film is set in said film projection station;
- f. a motor for driving both said tray moving means and said slide film moving means, said motor being arranged to run without an interruption between successive movements of said slide film moving means in successively moving slide films supported in said tray;
- g. means for actuating said slide film moving means and said tray moving means in a predetermined cycle by receiving driving force from said motor through a connection with said drive motor, said actuating means being provided at one part thereof with a mark for providing information corresponding to a position of said slide film;
- h. means for connecting and disconnecting said motor and said actuating means, including means for performing change-over between a first state, wherein the operative connection between said motor and said actuating means is possible, and a second state, wherein operative connection therebetween is not possible;
- i. switching means responsive to said positional information of said slide film provided by said mark, said switching means being located at a position wherein said switching means is able to detect said mark when said slide film is set in said film projection station, for causing said connecting and disconnecting means to change over from said first state to said second state when said switching means detects said mark, and for setting and maintaining said connecting and disconnecting means in said first state when said switching means does not detect said mark;
- j. a timer switch means including means for setting the projection time for said slide film, for measuring out said film projection time, beginning when said switching means causes said connecting and disconnecting means to change over from said first state to said second state, and for causing said connecting and disconnecting means to change over from said second state to said first state after lapse of said film projection time, and
- k. means for resetting said timer switch means in response to said switching means when said slide film is shifted by said slide film moving means from a position where it is set in said film projection station to a position where it is accommodated in said tray so that said timer switch means is thereafter ready to measure out said film projection time anew.
8 more elements
A slide film projector, comprising in combination:
- a. a removable tray for supporting a plurality of slide films in readiness;
- b. a tray guiding means for accepting said tray and guiding movement thereof in said projector;
- c. means for moving said tray in said tray guiding means in such a manner that each of a plurality of slide films accommodated in said tray may be projected one by one;
- d. optical projection means including a slide film projection station, a light source and an optical system for for projecting an image of said slide film;
- e. means for moving each of said slide films one by one back and forth between a position where said slide film is accommodated in said tray and a position where said film is located in said film projection station;
- f. a motor for driving both said tray moving means and said slide film moving means, said motor being arranged to run without an interruption between successive movements of said slide film moving means in successively moving slide films supported in said tray;
- g. a control disc arranged to rotate when receiving driving force provided by said motor for causing said tray moving means and said slide film moving means to operate in a predetermined cycle, said disc being provided on one part thereof with a mark for providing information corresponding to the position of said slide film with rotation of said disc;
- h. means for controllably connecting operatively said motor and said disc;
- i. electrically actuatable change-over means arranged to act on said connecting means for performing change-over operation between a first state, wherein said operative connection between said motor and said disc by said connecting means becomes possible, and a second position, wherein said operative connection therebetween becomes impossible;
- j. a first switching means responsive to said information provided by said mark and located at a position where it is set in said film projecting station, for causing said change-over means to change from said first state over to said second state when said first switching means detects said mark, and for setting and maintaining said change-over means in said state when said first switching means does not detect said mark;
- k. a timer circuit for producing a predetermined signal output at the end of the projection time of said slide film, said timer having means for setting the film projection time for said slide film and being electrically connected to said first switching means in such a way as to be actuated by said switching means to commence measuring out said film projection time when said first switching means causes said change-over means to perform the change-over operation from said first position to said second position;
- l. a second switching means responsive to said signal output from said timer circuit for causing said change-over means to perform the change-over operation from said second state to said first state when said predetermined signal output is produced by said timer circuit, and
- m. means for resetting said timer circuit responsive to said first switching means when said slide film is shifting by said slide film moving means from a position where said slide film is set in said projection station into a position where said slide film is accommodated in said tray for putting said timer circuit into a state wherein it is ready to begin again the measuring out of said film projection time.
10 more elements
Dependencies are inferred from the claim text.