Title:
FLOW RATE CONTROL ELEMENT
Document Type and Number:
Japanese Patent JPH01107228
Kind Code:
A
Abstract:
PURPOSE:To eliminate the need for a mechanical movable part, to improve the reliability, and to make the title element compact by controlling the area of the hole part in the center of an annular elastic body by utilizing repulsion force based upon the Meissner effect between a magnetic field and a superconductor. CONSTITUTION:A coil 5 is arranged in front of the elastic body 2 which contains the superconductor 3 and then the magnetic field which is larger in magnetic flux density at the center part of the annular elastic body 2 than at its peripheral part is established. Thus the magnetic field 6 is produced by the coil 5, and consequently the superconductor 3 receives force in its outer peripheral direction by the Meissner effect of the superconductor 3, so that the superconductor 3 becomes stable at the position where the shrinkage force of the annular elastic body 2 is balanced. The internal area of the annular elastic body 2, therefore, increases and the quantity of luminous flux passing through it increase. Consequently, no mechanical driving part is necessary, the reliability of the device is improved, and the device is made compact.
Inventors:
UCHIDA SHINJI
Application Number:
JP26675087A
Publication Date:
April 25, 1989
Filing Date:
October 21, 1987
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G02B26/02; (IPC1-7): G02B26/02
Attorney, Agent or Firm:
Toshio Nakao (1 outside)