Title:
ALTITUDE SENSOR FOR REMOTELY CONTROLLED HELICOPTER
Document Type and Number:
Japanese Patent JP3238235
Kind Code:
B2
Abstract:
PURPOSE: To prevent agricultural chemicals from adhering to a light transmission member and at the same time reduce the number of maintenances of a sensor by providing a member forming a closed space which is located at the lower part which is further isolated, by a specific distance, from a light transmission member at the bottom part inside a box body in the altitude sensor of a remotely controlled unmanned helicopter and has only an opening for passing emitted light and reflection light between the light transmission member and the opening.
CONSTITUTION: A light emitter 12, a light receiver 13. and light transmission members 14 and 16 are installed inside a box body 11. Members 19 and 28 for forming a closed space which is located at a position away from the light transmission member 16 at the bottom part inside the box body by a specific distance and has only an opening 27 are provided between the light transmission member 16 and an opening 27 located at the bottom part on a lower wall 29 at the corresponding position on a light path where emitted light from the light emitter 12 and reflection light to the light receiver 16 pass.
Inventors:
Akihiko Suzuki
Application Number:
JP8354693A
Publication Date:
December 10, 2001
Filing Date:
April 09, 1993
Export Citation:
Assignee:
YAMAHA HATSUDOKI KABUSHIKI KAISHA
International Classes:
B64D43/00; B64C39/02; B64D47/00; G01C3/06; G01S7/48; G01S7/481; G01S17/02; (IPC1-7): G01S7/481; B64D47/00; G01C3/06; G01S7/48
Domestic Patent References:
| JP446897A | ||||
| JP2161380A | ||||
| JP446898A | ||||
| JP5317528A | ||||
| JP288900U | ||||
| JP454746U |
Attorney, Agent or Firm:
Shigeru Yagita (2 outside)