Accession Number : AD0803284

Title :   A STUDY OF IN-AIR THERMOPLASTIC RECORDING OF CHARACTRON CRT DISPLAYS.

Descriptive Note : Final technical rept. 5 Jul 65-5 Aug 66,

Corporate Author : GENERAL ELECTRIC CO SYRACUSE NY ELECTRONICS LAB

Personal Author(s) : D'Antonio, N. F.

Report Date : OCT 1966

Pagination or Media Count : 72

Abstract : In-Air thermoplastic recording of alpha-numeric symbols from a charactron type cathode ray tube is investigated. A technique in electro-photography, the in-air method of recording relies upon a gas discharge of air molecules to form a latent charge pattern in the likeness of the image. Modulation of the charge pattern is facilitated with the use of a light sensitive photoreceptor. Images are stored as surface deformations on the reusable thermoplastic film. Development is instantaneous with the application of heat, projection by schlieren-optics, and erasure by melting the thermoplastic. Character on-times of 50 to 500 microseconds were recorded; update times of less than 5 seconds for a 3000 character frame is feasible. Lack of compatibility between the discharge process and short exposure times creates a problem in image quality. The problem area is overcome by any one of several variations in the established recording technique; they are discussed. A transient analysis of the equivalent circuit is given. A study of resolution, reciprocity, erasure, photoconductor characteristics and reusability are also included. Methods of image sampling are reviewed. (Author)

Descriptors :   *PHOTOGRAPHIC FILM), (*ELECTROPHOTOGRAPHY, PHOTOGRAPHIC FILM), (*THERMOPLASTIC RESINS, DISPLAY SYSTEMS, IMAGES, CATHODE RAY TUBES, GAS DISCHARGES, ELECTROSTATIC FIELDS, PHOTOELECTRIC MATERIALS, SANDWICH CONSTRUCTION, AIR, DIELECTRICS, LIGHT, MODULATORS, CIRCUITS, FEASIBILITY STUDIES.

Subject Categories : Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE