United States Patent [i9]
Rushbrooke et al.
[li] Patent Number: 4,922,092 [45] Date of Patent: May 1, 1990
[54] HIGH SENSITIVITY OPTICAL IMAGING APPARATUS
[75] Inventors: John Rushbrooke, Girton; Adrian Lyons; Patricia Tomkins, both of Turnbridge Wells; Richard Ansorge, Cambridge, all of England
[73] Assignee: Image Research Limited, England
[21] Appl. No.: 216,713
[22] PCT Filed: Nov. 20, 1987
[86] PCT No.: PCT/GB87/00824
§ 371 Date: Jul. 7, 1988
§ 102(e) Date: Jul. 7, 1988 [87] PCT Pub. No.: WO88/04045
PCT Pub. Date: Jun. 2, 1988
[30] Foreign Application Priority Data
Nov. 26, 1986 [GB] United Kingdom 8628285
Oct. 4, 1987 [GB] United Kingdom 8708615
[51] Int. C1.5 H01J 31/50
[52] U.S. CI 250/213 VT; 250/361 C
[58] Field of Search 250/213 R, 213 VT, 361 C
[56] References Cited
U.S. PATENT DOCUMENTS
3,963,928 6/1976 Zolner 250/361 C
4,555,731 11/1985 Zinchuk 250/213 VT
4,704,522 11/1987 Hirai et al 250/213 VT
Primary Examiner—David C. Nelms
Attorney, Agent, or Firm—Lee, Mann, Smith,
McWilliams & Sweeney
[57] ABSTRACT
Apparatus wherein an image intensifier (16) is interposed between a plurality of emission sites (10) from which emanate photons and a photo-detector (20) coupled to the output of the image intensifier to produce separate electrical signals processed by computer (24) to enable the respective signals to be correlated to the sites of the original emission source.
27 Claims, 7 Drawing Sheets
