Method and apparatus for producing successive lines of image points on a recording medium

US4090206A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Josef Pfeifer · Therwil, CH
• Rudolf Paulus · Munich, DE
• Walter Gutmann
• Michael Resch · Munich, DE

Key dates

• Filing date: Jul 13, 1977
• Grant date: May 16, 1978
• Expiry date: Jul 13, 1997

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N1/192
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Relative movement is effected between a recording medium and a row of light-emitting diodes (LED's). The row of LED's extends parallel to the direction in which the line of image points to be formed extends, and transverse to the direction of relative movement. Reduced-scale images of the LED's are projected onto the line on the recording medium on which the line of image points is to be formed. The LED's and/or the optical units forming the reduced-scale images are oscillated in a direction parallel to the direction in which the line of image points to be formed extends. Each image of an LED sweeps a straight linear region on the recording-medium line at least equal in length to the distance between adjoining LED's of the LED-row. During each n.sup.th half-period of oscillation, a succession of control signals is applied to each LED, determining a succession of adjoining image points which the respective LED forms upon the recording-medium line in question; n is an integer. The resultant line of image points contains a number of image points equal to an integral multiple of the number of LED's in the row of LED's.