公开(公告)号：JPS6299823A

公开(公告)日：1987-05-09

申请号：JP23024586

申请日：1986-09-30

Applicant: IBM

Inventor： CASWELL NATHAN SAUNDERS ,  GARWIN RICHARD LAWRENCE ,  LEVINE JAMES LEWIS

IPC: G06F3/042 ,  G06F3/033

公开(公告)号：DE3687568D1

公开(公告)日：1993-03-04

申请号：DE3687568

申请日：1986-10-20

Applicant: IBM

Inventor： CASWELL NATHAN SAUNDERS ,  GARWIN RICHARD LAWRENCE ,  LEVINE JAMES LEWIS

IPC: G06F3/042 ,  G06F3/033 ,  G06K11/08 ,  G01S17/46 ,  G01B11/00 ,  G01S17/88

Abstract: The location of an object in a work area is established by sweeping a single light beam over the area and employing in coordinate calculations the rotational arc of the light source, and the serial events of the light variation when the beam as reflected from a mirror positioned on the opposite periphery intersects the object and the light variation when the beam directly intersects the object.

公开(公告)号：DE3687568T2

公开(公告)日：1993-07-15

申请号：DE3687568

申请日：1986-10-20

Applicant: IBM

Inventor： CASWELL NATHAN SAUNDERS ,  GARWIN RICHARD LAWRENCE ,  LEVINE JAMES LEWIS

IPC: G06F3/042 ,  G06F3/033 ,  G06K11/08 ,  G01S17/46 ,  G01B11/00 ,  G01S17/88

Abstract: The location of an object in a work area is established by sweeping a single light beam over the area and employing in coordinate calculations the rotational arc of the light source, and the serial events of the light variation when the beam as reflected from a mirror positioned on the opposite periphery intersects the object and the light variation when the beam directly intersects the object.

公开(公告)号：DE3679232D1

公开(公告)日：1991-06-20

申请号：DE3679232

申请日：1986-05-15

Applicant: IBM

Inventor： CASWELL NATHAN SAUNDERS ,  CHANG IFAY FAY

IPC: G06F3/037 ,  G06F3/033 ,  G06K11/06 ,  G06K11/18

Abstract: The present invention relates to a light pen apparatus, for use with an interactive display having a scanning electron beam scanning in lines (108) across a screen on which there are light emitting regions, and of the type comprising a light pen (36) for contacting the screen (6) of the interactive display and for collecting light from the screen, the light pen having an optical field of view (112) when in contact with the screen which is larger than a single scan line of the display, means for sensing the intensity of the light collected by the light pen, and means for generating an output signal dependent upon the intensity. … Apparatus in accordance with the invention is characterised in that the output signal generating means comprises first threshold detection means responsive to the output of the sensing means for detecting when the intensity of the light collected by the light pen exceeds a first threshold level, second threshold detection means responsive to the output of the sensing means for detecting when the intensity of the light collected by the light pen exceeds a second threshold level, and light pen position determining apparatus including means responsive to the second threshold detection means for determining the vertical position of the light pen with respect to the display screen, and means responsive to the first threshold detection means for determining the horizontal position of the light pen with respect to the display screen.