公开(公告)号：US3912198A

公开(公告)日：1975-10-14

申请号：US40900764

申请日：1964-11-04

Applicant: LTV AEROSPACE CORP

Inventor： DELL CHARLES C ,  HARMS JR A D ,  KNOWLES ALBERT B ,  MEREDITH FRED D ,  SUTHERLAND SPURGEON

IPC: F41G7/00 ,  F41G7/22 ,  F42B15/02

CPC classification number: F41G7/2253 ,  F41G7/007 ,  F41G7/2293

Abstract: 1. A tracking system including: a device having means providing a surface on which light from a predetermined optical field may be focused, said means emitting electrons at each point of said surface in accordance with the intensity of light impinging thereon, an anode, and means for focusing electrons emitted from a small area of said surface on said anode; moving means for continuously changing in a predetermined manner the position of said small area of said surface from which emitted electrons are focussed on said anode; and means and operatively associated with last mentioned means responsive to the intensity of the emitted electrons focussed on said anode for causing the position of said small area to be within a large area of said surface on which impinges light of an intensity different than that of the light impinging on areas of said surface about said large area by causing said moving means to move the position of said small area back into said large area and away from an edge of said large area when said small area tends to move past an edge of said large area.