Title:
CONTACT SENSOR
Document Type and Number:
Japanese Patent JP3386648
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To ensure accurate detection even if an object is a poor conductor or an insulator with respect to a wire by disposing a circulating conductor spiral wire at the forward end of a probe conductor wire through an air gap.
SOLUTION: A spring conductor probe wire having flexible coiled end part penetrates, at the base side end part thereof, a forward end cap 12 and then it is connected with the negative-phase input terminal of an operational amplifier in an oscillation circuit housed in the body 11 of a contact sensor 10. On the other hand, the coiled part of wire 1 is press fitted in an insulating sleeve 13 which is then press fitted in a conductor spiral wire 2 connected with the body earth line of oscillation circuit. When the sensor 10 approaches an object to be searched, the wire 2 strikes the object at first to touch the wire 1 through resilient deformation thus connecting the wire 1 with the body earth (and interrupting the oscillation circuit). According to the arrangement, contact can be detected accurately even if the surface of object exhibits poor conductivity or dielectric properties.
Inventors:
Hirofumi Sonoda
Kenji Okuyama
Koji Sasaki
Kenji Okuyama
Koji Sasaki
Application Number:
JP2565396A
Publication Date:
March 17, 2003
Filing Date:
February 13, 1996
Export Citation:
Assignee:
Nittetsu Sumikin Welding Industry Co., Ltd.
International Classes:
G01B7/00; H01H1/24; (IPC1-7): G01B7/00
Domestic Patent References:
| JP947874A | ||||
| JP62126711U |
Attorney, Agent or Firm:
Nobu Sugi