Battery operated electronic alphanumeric permanent recording instrument, such as recording pocket calculator

US4143382A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Brill
• Kurt Hurst · Stuttgart, DE
• Manfred Koder · Gerlingen, DE

Key dates

• Filing date: Mar 11, 1977
• Grant date: Mar 6, 1979
• Expiry date: Mar 11, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K15/14
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A strip of recording paper on which a metallization is formed on a paper substrate, which metallization is burned off under the influence of an electrical discharge is passed beneath a recording head. In one embodiment, the recording head is moved transversely across the recording paper, while in engagement with a group of contact tracks which are, selectively, energized in accordance with the desired alphanumeric output. The recording head is formed with point contact electrodes and line-contact electrodes. The alphanumeric output is displayed on the instrument in segmental form and when a segment is to be printed in the direction transverse to the relative direction of movement of the head and the paper, the line-contact electrode is momentarily energized to cause printing of a line; if a segment is to be printed which extends in the direction of relative movement of the head and the paper, a point contact segment is energized for a distance corresponding to the distance of the segment to be formed. The recording head may be moved with respect to the paper, the paper being held stationary during recording, for example transversely across the recording paper, and then returned to …