Title:
CONTACTLESS PRESSURE SWITCH
Document Type and Number:
WIPO Patent Application WO/2016/021104
Kind Code:
A1
Abstract:
A contactless pressure switch, wherein, when the pressure of a fluid in a pressure-receiving chamber (28A) is less than a predetermined value, a light beam (LB) from a light-emitting element (16) is incident on a surface (20bs) through a through-hole (20a), and then impinges on an internal peripheral face forming the through-hole (20a), a light-receiving element (22) therefore does not receive the light beam (LB), and a high-level detection pulse signal (So) is therefore sent indicating that the pressure of the fluid in the pressure-receiving chamber (28A) is less than the predetermined value. Meanwhile, when the pressure of the fluid in the pressure-receiving chamber (28A) is equal to or greater than the predetermined value, the light beam (LB) from the light-emitting element (16) is incident on the surface (20bs) through the through-hole (20a), and the reflected light beam (LB) is then emitted toward the light-receiving element (22) through the through-hole (20a), the light-receiving element (22) thereby receives the light beam (LB), and a low-level detection pulse signal (So) indicating that the pressure of the fluid in the pressure-receiving chamber (28A) is equal to or greater than the predetermined value is therefore sent.
More Like This:
Inventors:
HAMABE YOSHIHIRO (JP)
ASHIZAWA HISAYUKI (JP)
ASHIZAWA HISAYUKI (JP)
Application Number:
PCT/JP2015/003145
Publication Date:
February 11, 2016
Filing Date:
June 23, 2015
Export Citation:
Assignee:
SAGINOMIYA SEISAKUSHO INC (JP)
International Classes:
G01L9/00; G01L7/08; G01L11/02; H01H35/00; H01H35/34
Foreign References:
| GB1501857A | 1978-02-22 | |||
| JPS63101840U | 1988-07-02 | |||
| JPS63269030A | 1988-11-07 |
Attorney, Agent or Firm:
TANI & ABE, p. c. (JP)
Patent business corporation A valley and Abe patent firm (JP)
Patent business corporation A valley and Abe patent firm (JP)
Download PDF: