Television Image Enlarged By Revolving Spiral Mirror (Dec, 1936)

Television Image Enlarged By Revolving Spiral Mirror
Enlargement of television pictures to a size that can be shown to large theater audiences has been achieved by a spiral-mirror contrivance invented by a German engineer. The ordinary image on the television tube is too small to be seen except by those close at hand, but with the aid of the spiral mirror the picture is caught from the tube, thrown through an enlarging camera or system of magnifying lenses and projected to any desired size. The spiral is driven by an electric motor.

  1. Kryten007 says: June 8, 20077:32 pm

    Yes! Huzzah for mechanical TV!!!

  2. jayessell says: June 9, 200710:27 am

    I had a similar idea for projection TV using lasers.
    In the same manner as the rotating mirror in a laserprinter, the beam would be swept across the screen by two perpendicular rotating mirrors.
    Modern digital electronics should be able to sync the vertical and horizontal mirror motors.
    Even better if a frame buffer would hold the image to be displayed and the projector read the part of the image the mirrors were pointing at.

    Of course, this would demand uneconomically powerful Red (easy) Green (expensive) and Blue (not sure they exist) semiconductor laser diodes, and a system of dicromic mirrors to reassemble the three beams into one beam.
    (The process used in 3 tube color cameras, only in reverse.)

    Unweildy for video, I suspect it could be used for text, like that clock with the oscillating wand.…

  3. Mirror TV's uk says: October 19, 20097:59 am

    Mechanical tv’s are wicked – I am so tempted to recreate one of these now

  4. jayessell says: October 19, 200911:57 am

    Mirror TV’s UK….
    Check out the Alexandra Palace Television Society at YouTube.
    Several retrospectivies on the Birth of Electronic Television.
    Also at YouTube, several mechanical TVs actually running.
    (Wheel big. Picture small.)

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