Apparatus and method for detecting displacement of a movable member of an electronic musical instrument
DC CAFCFirst Claim
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1. A sensor device comprising:
- a sensor sheet having a surface area and providing electrical resistance having a value, the value of the electrical resistance changing with the surface area of the sensor sheet that is pressed; and
a coil spring having a conical shape with a wider end, the wider end of the coil spring disposed opposite to the sensor sheet such that the coil spring presses an increasing surface area of the sensor sheet as the coil spring is compressed.
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Abstract
An apparatus for detecting the displacement of a movable member of an electronic musical instrument. The apparatus has superior mechanical durability compared to displacement sensors of the past and can withstand long-term use. The apparatus includes a sensor that provides a detectable electrical characteristic having a value and a spring that, when compressed upon displacement of the movable member acts with the sensor, causing the value of the electrical characteristic to change. The value of the electrical characteristic represents the amount of displacement of the movable member and is used by a controller of the electronic musical instrument.
23 Citations
27 Claims
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1. A sensor device comprising:
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a sensor sheet having a surface area and providing electrical resistance having a value, the value of the electrical resistance changing with the surface area of the sensor sheet that is pressed; and a coil spring having a conical shape with a wider end, the wider end of the coil spring disposed opposite to the sensor sheet such that the coil spring presses an increasing surface area of the sensor sheet as the coil spring is compressed. - View Dependent Claims (2)
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3. A sensor device for detecting displacement of a movable object, comprising:
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a member providing a detectable electrical characteristic that has a value; and a spring that, upon displacement of the movable object, is compressed and acts with the member providing the detectable electrical characteristic; wherein action between the spring and the member providing the detectable electrical characteristic causes the value of the electrical characteristic to change. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of making a displacement detector, comprising:
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providing a member having a detectable electrical characteristic that has a value; disposing a spring opposite to the member having a detectable electrical characteristic; and disposing a movable object relative to the spring to compress the spring and cause the spring to act with the member having the detectable electrical characteristic upon displacement of the movable object, wherein action between the spring and the member having the detectable electrical characteristic causes the value of the electrical characteristic to change. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification