Global Patent Index - EP 1000377 A1

EP 1000377 A1 20000517 - THREE DIMENSIONAL IMAGE DISPLAY

Title (en)

THREE DIMENSIONAL IMAGE DISPLAY

Title (de)

DREIDIMENSIONALE BILDANZEIGEVORRICHTUNG

Title (fr)

AFFICHEUR D'IMAGES EN TROIS DIMENSIONS

Publication

EP 1000377 A1 (EN)

Application

EP 98937677 A

Priority

  • GB 9802360 W
  • GB 9716689 A

Abstract (en)

[origin: WO9908145A1] The 3-D image display consists of a pixellated display (11) that is illuminated through a beam splitter (16). A plan mirror (17) is provided on a movable mount (15) so that the mirror may be moved towards or away from an objective lens (12) positioned between the mirror (17) and the beam splitter (16). A quarter wave plate (18) is provided between the beam splitter (16) and the mirror (17) so that light reflected back from the mirror (17) through the quarter wave plate (18) passes straight through the beam splitter (16) to an eyepiece lens (13). Movement of the mirror (17) enables the mirror (17) to act as an optical path length modifier and permits an image from the display (11) to be presented at different focal positions. Rapid cycling through different focal positions results in the image being perceived as a 3-D image. As the objective lens (12) is positioned between the beam splitter (16) and the mirror (17), the objective lens (12) also acts as a demagnifying lens for images from the display (11). Preliminary demagnification of the image reduces the distances the mirror (17) is required to travel to provide the desired changes in focal position. This in turn reduces the demands on the performance of the mount (15), that are considerable in conventional systems where no demagnification is performed. In this way simple optical and mechanical components may be employed in the image display to generate perceived three dimensional images.

IPC 1-7

G02B 27/22; H04N 13/00

IPC 8 full level

G02B 27/01 (2006.01); G02B 27/22 (2006.01); H04N 5/64 (2006.01); H04N 13/00 (2006.01); H04N 13/04 (2006.01); G02B 5/30 (2006.01); G02B 27/00 (2006.01)

CPC (source: EP)

G02B 27/017 (2013.01); G02B 27/0172 (2013.01); G02B 30/24 (2020.01); G02B 30/54 (2020.01); H04N 13/32 (2018.05); H04N 13/322 (2018.05); H04N 13/344 (2018.05); H04N 13/346 (2018.05); H04N 13/395 (2018.05); G02B 5/30 (2013.01); G02B 2027/011 (2013.01); G02B 2027/0116 (2013.01); H04N 13/324 (2018.05); H04N 13/365 (2018.05); H04N 13/393 (2018.05); H04N 13/398 (2018.05)

Citation (search report)

See references of WO 9908145A1

Designated contracting state (EPC)

DE GB

DOCDB simple family (publication)

WO 9908145 A1 19990218; CA 2300047 A1 19990218; EP 1000377 A1 20000517; GB 9716689 D0 19971015; JP 2001512849 A 20010828

DOCDB simple family (application)

GB 9802360 W 19980806; CA 2300047 A 19980806; EP 98937677 A 19980806; GB 9716689 A 19970807; JP 2000506557 A 19980806