SPEED DETECTOR AND SWING TOOL HAVING THE SAME

• US 20110081981A1
• Filed: 10/01/2010
• Published: 04/07/2011
• Est. Priority Date: 10/06/2009
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: OKAMOTO, Hiroshi
• Application Number:
  US12/896,326
• Publication Number:
  US 20110081981A1
• Time in Patent Office: Days
• US Class Current: 473/233
• CPC Class Codes: A63B 2220/56 Pressure
• CPC Class Codes: A63B 2220/58 Measurement of force related parameters by electric or magnetic means
• CPC Class Codes: A63B 69/0002 for baseball
• CPC Class Codes: A63B 69/3632 Clubs or attachments on clubs, e.g. for measuring, aligning A63B69/3614 takes precedence; clubs for swinging exercises in general A63B15/00
• CPC Class Codes: A63B 69/38 for tennis A63B61/006, A63B69/0073 and A63B69/0097 take precedence
• CPC Class Codes: G01P 5/16 using Pitot tubes , e.g. Machmeter

Abstract

A speed detector includes: a pressure sensor including a pitot tube attached to a moving body in a state in which an air inlet hole is directed toward a direction of a movement of the moving body, a diaphragm having a pressure receiving surface displaced by pressure, and a pressure-sensitive section adapted to receive force caused by the displacement to detect the pressure, the pressure sensor being disposed to the moving body and detecting the pressure caused in the pitot tube; and an operation section adapted to detect a speed of the moving body based on the difference between the pressure at rest and the pressure in movement of the moving body, wherein the pressure sensor is disposed so that a normal line of the pressure receiving surface becomes perpendicular to the direction of the movement.

Claims

1. A speed detector comprising:

a pressure sensor including

a pitot tube attached to a moving body in a state in which an air inlet hole is directed toward a direction of a movement of the moving body,

a diaphragm having a pressure receiving surface displaced by pressure, and

a pressure-sensitive section adapted to receive force caused by the displacement to detect the pressure,

the pressure sensor being disposed to the moving body and detecting the pressure caused in the pitot tube; and

an operation section adapted to detect a speed of the moving body based on the difference between the pressure at rest and the pressure in movement of the moving body,

wherein the pressure sensor is disposed so that a normal line of the pressure receiving surface becomes perpendicular to the direction of the movement.

3. The speed detector according to claim 1, wherein

the pitot tube has a tapered shape having a diameter decreasing toward the direction of the movement.

4. The speed detector according to claim 1, wherein

the moving body receives acceleration in a direction perpendicular to the direction of the movement, and the pressure sensor is disposed so that the normal line of the pressure receiving surface becomes perpendicular to the direction of the acceleration.

5. The speed detector according to claim 1, wherein

the moving body stops at a measured point for a predetermined period of time, and then moves so as to pass through the measured point, and

the operation section calculates the speed of the moving body based on a difference between the pressure the pressure sensor detects when the moving body stops at the measured point for the predetermined period of time, and the pressure the pressure sensor detects when the moving body is in movement.

6. A SWING tool comprising:

the speed detector according to claim 1 attached.

7. The speed detector according to claim 3, wherein

the moving body receives acceleration in a direction perpendicular to the direction of the movement, and the pressure sensor is disposed so that the normal line of the pressure receiving surface becomes perpendicular to the direction of the acceleration.

8. The speed detector according to claim 3, wherein

the moving body stops at a measured point for a predetermined period of time, and then moves so as to pass through the measured point, and

the operation section calculates the speed of the moving body based on a difference between the pressure the pressure sensor detects when the moving body stops at the measured point for the predetermined period of time, and the pressure the pressure sensor detects when the moving body is in movement.

9. The speed detector according to claim 4, wherein

the moving body stops at a measured point for a predetermined period of time, and then moves so as to pass through the measured point, and

the operation section calculates the speed of the moving body based on a difference between the pressure the pressure sensor detects when the moving body stops at the measured point for the predetermined period of time, and the pressure the pressure sensor detects when the moving body is in movement.

10. A SWING tool comprising:

the speed detector according to claim 3 attached.

11. A SWING tool comprising:

the speed detector according to claim 4 attached.

12. A SWING tool comprising:

the speed detector according to claim 5 attached.

13. A SWING tool comprising:

the speed detector according to claim 7 attached.

14. A SWING tool comprising:

the speed detector according to claim 8 attached.

15. A SWING tool comprising:

the speed detector according to claim 9 attached.

2. A speed detector comprising:

a container attached to a moving body and having an opening section;

a first pressure sensor disposed inside the container and including

a pitot tube attached to the opening section in the state of having an air inlet hole directed toward a direction of a movement of the moving body to form an internal space integrally with the container, and having pressure in the internal space vary due to the movement of the moving body,

a diaphragm having a pressure receiving surface displaced by the pressure, and

a pressure-sensitive section adapted to receive force caused by the displacement to detect the pressure;

a second pressure sensor disposed outside the internal space; and

a second operation section adapted to detect a speed of the moving body based on a difference between the pressure detected by the first pressure sensor and the pressure detected by the second pressure sensor,

wherein the first and the second pressure sensors are disposed so that a normal line of the pressure receiving surface becomes perpendicular to the direction of the movement.