公开(公告)号：US3294701A

公开(公告)日：1966-12-27

申请号：US15293261

申请日：1961-11-16

Applicant: IBM

Inventor： VOGEL MARCEL J ,  BROOKMAN JOHN W

IPC: C09K11/08 ,  C09K11/77

CPC classification number: C09K11/7708 ,  C09K11/0822 ,  C09K11/77 ,  C09K11/7706 ,  C09K11/7712 ,  C09K11/7735 ,  C09K11/7776

公开(公告)号：US3622315A

公开(公告)日：1971-11-23

申请号：US3622315D

申请日：1968-11-14

Applicant: IBM

Inventor： BROOKMAN JOHN W ,  MURPHY JOHN B ,  REYNOLDS ZACK D

IPC: H01J31/38 ,  H04R23/00 ,  G03G ,  H01J31/48 ,  H04N5/76

CPC classification number: H04R23/006 ,  H01J31/38

Abstract: A photoerasable scan converter is described for converting digital and/or optical input to a raster signal output for storage in a buffer and subsequent monitoring. In combined image mode, a charge pattern representing a first image is painted on the photoconductive target of a Vidicon tube by an electron beam in directed-beam mode. A modification or modulation of a charge pattern representing a second image is provided on the target by exposing said screen to the second image through an optical system. The combined images, or charge patterns, are read out by electron beam scanning in raster mode. Any remanent charge on the target is erased by discharging with a short, high intensity flash of light. Similarly, a single image from either optical exposure or electron beam painting may be read out and erased.