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| Device apt to permit skiing on snowless ground |
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| Roller ski |
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| Soft boot binding for snow boards |
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Flying spherical body measuring apparatus
| Details |
Inventors: Iijima, Kenzaburou; Kondo, Katsufumi; Masuda, Katsuhiko; Yataka, Kouji; Chujo, Yasuyuki;
Assignee: Yamaha Corporation (Hamamatsu, JP)
Primary Examiner: Buczinski; Stephen C.
Assistant Examiner:
Attorney, Agent or Firm: Loeb and Loeb
The initial movement of a spherical body is detected by detecting the intersection with a light beam emitted from trigger light illuminating portion 2 to trigger light-receiving portion 3, and as a result, measurement of time by an arithmetic processing unit is started. During flight, spherical body 1 intersects light beams emitted from surface velocity sensors 4 and 5, the reflected light therein is detected by these surface velocity sensors 4 and 5, and the surface velocity of spherical body 1 is then measured. Spherical body 1 continues in flight and intersects at least two light beams irradiated from multi-beam illuminating portion 6 which are detected by multi-beam light-receiving portion 7. Based on a signal from multi-beam light-receiving portion 7 the arithmetic processing unit measures the time of intersection of spherical body 1 with a light beam, and then calculates the angle of elevation, horizontal angle, velocity and surface velocity of spherical body 1 based on the aforementioned measured time period. Furthermore, this arithmetic processing unit also calculates the amount of directional rotation of spherical body 1 based on the aforementioned calculated angle of elevation, horizontal angle, velocity and surface velocity of spherical body 1. |
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DETAILED DESCRIPTION The present invention, taking into consideration the aforementioned, provides a flying spherical body measuring apparatus through which highly accurate results can be obtained wherein up-sizing does not occur, thus maintaining the integrity of a simple construction.
The flying spherical body measuring apparatus according to a first aspect of the present invention comprises: a detecting means for detecting the a start of motion of a flying spherical body from a predetermined initial flight point; a surface velocity sensor, arranged in a forward direction of said flying spherical body, with respect to said initial flight point, for optically measuring a surface velocity of said flying spherical body; a multi-beam illuminating portion for emitting a plurality of light beams along a plane in a manner such that at least two of said plurality of light beams intersect said flying spherical body while in flight, said multi-beam illuminating portion being arranged in a forward direction of said flying spherical body with respect to said surface velocity sensor; a multi-beam light receiving portion for receiving respectively a plurality of light beams emitted from said multi-beam illuminating portion; and an arithmetic processing means for timing periods from the start of motion of the spherical body to intersections of the spherical body with at least two of said plurality of light beams and for calculating amounts of rotation of said flying spherical body with respect to predetermined directions based on the surface velocity measured by said surface velocity sensor, and amounts of an angle of elevation, a horizontal angle and velocity of said flying spherical body based on said periods.
In the apparatus according to a first aspect of the present invention, the initial flight of the flying spherical body is detected by means of a initial flight detector, at which time the arithmetic processing unit begins measuring time.
During flight, when the spherical body intersects a light beam emitted by the surface velocity sensor, the reflected light therein is detected by the surface velocity sensor, which then measures the surface velocity of the spherical body
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