Drawing apparatus
First Claim
1. Drawing apparatus comprising a closed chamber one wall of which is a translucent screen and which contains liquid or powder of non-magnetic material that will adhere as a coating to the screen even when the interior surface thereof is downwardly facing, a scriber within the chamber having a base for cooperating with the chamber wall opposite said screen and a stylus upstanding therefrom for cooperating with the screen, the base having a span which prevents significant tilting of the scriber and the height of the scriber being such that, with the base resting on said opposite wall, the tip of the stylus is marginally clear of the screen, and a pen-like movable guide member external to the chamber, the scriber and guide member having a mutual magnetic attraction, whereby movement of the guide member over the screen raises the stylus into contact with the underside thereof and causes the stylus to scribe an externally visible line corresponding to said movement.
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Accused Products
Abstract
Drawing apparatus has a screen (4, 24) forming one wall of a chamber containing liquid or powder material and a scriber (2, 11, 26). A guide "pen" (3, 13) magnetically attracts the scriber into contact with the screen and as it is moved over the surface the scriber tracks it, making a visible line in the material adhering to the underside of the screen. The surface may have means for producing signals as the pen and scriber traverse, each signal being identifiable with a particular point. If the succession of signals match a stored program, a sound associated with the figure drawn is generated.
38 Citations
7 Claims
- 1. Drawing apparatus comprising a closed chamber one wall of which is a translucent screen and which contains liquid or powder of non-magnetic material that will adhere as a coating to the screen even when the interior surface thereof is downwardly facing, a scriber within the chamber having a base for cooperating with the chamber wall opposite said screen and a stylus upstanding therefrom for cooperating with the screen, the base having a span which prevents significant tilting of the scriber and the height of the scriber being such that, with the base resting on said opposite wall, the tip of the stylus is marginally clear of the screen, and a pen-like movable guide member external to the chamber, the scriber and guide member having a mutual magnetic attraction, whereby movement of the guide member over the screen raises the stylus into contact with the underside thereof and causes the stylus to scribe an externally visible line corresponding to said movement.
Specification