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 Title: |
US4571844:
Angle change detector
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Komasaku, Seiichi; Yokohama, Japan
Iiyama, Hiroshi; Yokosuka, Japan
Watanabe, Noboru; Tokyo, Japan
Tanaka, Osamu; Kawasaki, Japan
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| Assignee: |
Jeco Co., Ltd., Kanagawa, Japan
other patents from JECO CO., LTD. (292010) (approx. 40)
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| Published / Filed: |
1986-02-25
/ 1983-06-08
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| Application Number: |
US1983000502087
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| IPC Code: |
Advanced:
G01C 9/06;
Core:
G01C 9/00;
IPC-7:
G01C 9/06;
G01C 9/12;
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| U.S. Class: |
Current:
033/366.24;
033/366.23;
033/391;
033/402;
Original:
033/366;
033/391;
033/402;
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| Field of Search: |
033/366,368,391,402
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| Priority Number: |
| 1982-06-09 |
JP1982000085633U |
| 1982-06-28 |
JP19820097171JXU |
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| Abstract: |
An angle change detector which can also be used as an inclination angle detector comprises a pair of opposing magnets, a sector-shaped pendulum made of an electroconductive non-magnetic material and swingable past a spacing between the opposing magnets, and a pair of photosensors disposed on both side edges of the pendulum. Each photosensor comprises a light emitting diode and a phototransistor disposed on both sides of the pendulum. Output signals of the phototransistors are compared with a reference signal for producing an output signal corresponding to the degree of swinging of the pendulum.
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| Attorney, Agent or Firm: |
Pfund, Charles E. ;
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| Primary / Asst. Examiners: |
Little, Willis;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 2 claims |
We claim:
1. An angle change detector comprising:
- a swingable pendulum of an electroconductive non-magnetic material;
- means for applying magnetic flux to the pendulum; and
- means for detecting the rotation of the pendulum;
wherein said magnetic flux applying means comprises a pair of opposing magnets supported by a magnetic plate frame, said pendulum is pivotally mounted to the magnetic plate frame, said pendulum is pivotally mounted to the magnetic plate frame to swing past a spacing between the opposing magnets, and said detecting means comprises two photosensors disposed near opposite side edges of said pendulum and adjustable threshold circuits respectively connected with the two photosensors to produce an output signal when an output signal from the photosensor exceeds a predetermined selectable threshold level.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 51 U.S. patent(s) that reference this one
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