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TEACHING MACHINE IN WHICH INSTRUCTION ITEMS ARE PROJECTED BY AN IMAGE PROJECTOR

  • US 3,665,615 A
  • Filed: 09/04/1970
  • Issued: 05/30/1972
  • Est. Priority Date: 09/09/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. Teaching machine comprising an image projector projecting sequential images of a strip of film on a screen, said film strip carrying instruction items (4) and response items (5-8), at least one response item representing a correct answer, and further carrying at least one response code track (a, b, c, d), said at least one code track having a first optical density, and spots of substantially different optical density placed in coded position on said at least one track at predetermined position on the film, the position of said spots on the film being associated with previously selected response items, the correct answer being represented by a selected spot on a predetermined track, the spot associated with a response item at said predetermined track being positioned on the film in predetermined relation with the correct response item;

  • a pointer (FIG.

         5) adapted to be manipulated by a student to indicate a selected response item, said pointer having a photosensitive end responsive to light values associated with the response item;

    movable masking means (12) movable (50) to scan across at least the response code track and the response items, the mask associating light values of the spot at a predetermined track with the correct response item;

    means (32,

         33) starting the scanning of said masking means (12);

    at least one optical-electrical transducer means (21-24) located in light-receiving relation with respect to said at least one response code track; and

    logic means (FIG.

         6) coupled to said transducer means and to said photosensitive end (29) of the pointer and detecting coincidence bEtween change in light values of the photosensitive end of the pointer and a specific transducer means associated with a specific track upon movement of said mask.

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