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 Three-dimensional display devices

Details
Inventors: Rowe, William Guy;
Assignee:
Primary Examiner: Curtis; Marshall M.
Assistant Examiner:
Attorney, Agent or Firm: Harrison; Michael L.

Three-dimensional images are produced within a transparent cathode-ray tube by directing a plurality of electron beams into a cloud of phosphorescent particles and causing the beams to intersect at a point within the cloud. Each individual beam's current is maintained at less than the threshold of luminescence of the particles but the combined currents may be caused to exceed that threshold by a controlled amount thereby producing light spots of variable brightness at the beam intersection point, which point may be directed into any part of the volume of the cloud. The particle cloud is produced by a high-gradient electric field pump. Use of the pump for particle cloud production in such applications as beam testing is also described.

DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for visually and photographically evaluating the characteristics of experimental electron beams which comprises: a sealed substantially evacuated envelope having a display space and having a transparent portion for viewing the display space; a plurality of particles having surfaces of luminescent material, contained within the envelope, which particles luminesce when bombarded by electron beams; a collection chamber adjoining the envelope and communicating with the interior of the envelope, and so oriented that the free fall of particles under gravitational attraction results in the accumulation of particles within the chamber; an electrode located within the collection chamber and adapted to produce, when electrified, a high-gradient electric field in the vicinity of the collection chamber for agitating the particles to cause said particles to repetitively traverse the display space; means for introducing experimental electron beams into the display space of the envelope.
2.
An apparatus for visually and photographically evaluating the characteristics of ions and sub-atomic particles which comprises: a sealed substantially evacuated envelope having a display space and having a transparent portion for viewing the display space; a plurality of particles having surfaces of luminescent material, contained within the envelope, which particles luminesce when bombarded by ions or sub-atomic particles; a collection chamber adjoining the envelope and communicating with the interior of the envelope, and so oriented that the free fall of particles under gravitational attraction results in the accumulation of particles within the chamber; an electrode located within the collection chamber and adapted to produce, when electrified, a high-gradient electric field in the vicinity of the collection chamber for agitating the particles to cause said particles to repetitively traverse the display space; and, means for introducing ions or sub-atomic particles into the display space of the envelope


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