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Helical Light Scanner for Optical Printing

IP.com Disclosure Number: IPCOM000091360D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Fleisher, H: AUTHOR

Abstract

Propagation of a character-shaped beam by a scanner for display or on a photosensitive material for nonimpact printing is performed with this helical light deflection system. Drum-shaped deflectors 1 and 2 are positioned on either side of character mask 3. Each deflector contains a helical-shaped reflecting surface 4 and 5. The surface can be considered to be cut into the side of the drums as a ramp. The drums have parallel axes of rotation and rotation is performed in opposite directions.

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Helical Light Scanner for Optical Printing

Propagation of a character-shaped beam by a scanner for display or on a photosensitive material for nonimpact printing is performed with this helical light deflection system. Drum-shaped deflectors 1 and 2 are positioned on either side of character mask 3. Each deflector contains a helical-shaped reflecting surface 4 and 5.

The surface can be considered to be cut into the side of the drums as a ramp. The drums have parallel axes of rotation and rotation is performed in opposite directions.

As drum 1 rotates, collimated light beam 7 provided by laser 6 is incident on helical surface 4. The reflected beam is deflected parallel to itself so that the beam traverses mask 3. On passing through mask 3, the beam is now in the shape of the selected character and is reflected from helical surface 5 of drum 2. As drums 1 and 2 are identical in shape and construction, the downward displacement of the beam produced by drum 1 is cancelled by the equal but opposite displacement of the beam by drum 2. The reflected beam 9 is incident on screen 8.

If the helical surface on drum 2 is formed in the same direction as the helical surface on drum 1 but with the reflecting surface on the underside, and the drums are rotated in the same direction, the reflected beam is now propagated in the same direction as, but displaced from, the incident beam. Rapid flyback of the beam is produced by its returning to the beginning of the helical mirror. The...