Coordinate input apparatus
First Claim
1. A coordinate input apparatus comprising:
- vibration generating means for generating a vibration;
a vibration propagating member for propagating the vibration generated by said vibration generating means by allowing the vibration generating means to come into contact with said vibration propagating means;
vibration detecting means for detecting a vibration which is propagated to the vibration propagating member;
a supporting member which supports the vibration propagating member and in which a vibration propagating velocity is slower than that of the vibration propagating member; and
position coordinate calculating means for calculating coordinates of a position where the vibration generating means which has come into contact with the vibration propagating member on the basis of a detection signal from the vibration detecting means.
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Abstract
A coordinate input apparatus comprises: a vibration pen to generate a vibration; a vibration propagating plate to propagate the vibration generated by the pen by touching the pen to the plate; vibration sensors to detect the vibration propagated to the plate; a supporting member which supports the plate and whose vibration propagating velocity is slower than the plate; a position coordinate calculating circuit to calculate the position coordinates of the pen on the plate on the basis of the detection signals from the sensors; and a display which is provided below the supporting member and displays the calculated coordinates. The plate is made of metal or transparent glass and the supporting membrr is made of a transparent synthetic resin. The supporting member is directly in contact with the plate at a rough surface, its acoustic impedance value is different from the plate, and its vibration attenuation ratio is larger than that of the plate. Since the vibration wave component propagated to the sensors is not influenced by the interference of the vibration propagated in the support member, the coordinates can be accurately detected on the basis of the vibration detection waveforms without distortion.
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Citations
13 Claims
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1. A coordinate input apparatus comprising:
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vibration generating means for generating a vibration; a vibration propagating member for propagating the vibration generated by said vibration generating means by allowing the vibration generating means to come into contact with said vibration propagating means; vibration detecting means for detecting a vibration which is propagated to the vibration propagating member; a supporting member which supports the vibration propagating member and in which a vibration propagating velocity is slower than that of the vibration propagating member; and position coordinate calculating means for calculating coordinates of a position where the vibration generating means which has come into contact with the vibration propagating member on the basis of a detection signal from the vibration detecting means. - View Dependent Claims (2, 3, 4, 5)
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6. A coordinate input apparatus comprising:
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vibration generating means for generating a vibration; a vibration propagating member for propagating the vibration generated by the vibration generating means by allowing the vibration generating means to come into contact with the vibration propagating member; vibration detecting means for detecting the vibration which is propagated to the vibration propagating member; a supporting member which supports the vibration propagating member and in which an acoustic impedance value is different from that of the vibration propagating member; and position coordinate calculating means for calculating coordinates of a position where the vibration generating means which has come into contact with the vibration propagating member on the basis of a detection signal from the vibration detecting means. - View Dependent Claims (7, 8, 9, 10)
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11. A coordinate input apparatus comprising:
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vibration generating means for generating a vibration; a vibration propagating member for propagating the vibration generated by the vibration generating means by allowing the vibration generating means to come into contact with the vibration propagating member; vibration detecting means for detecting the vibration which is propagated to the vibration propagating member; a supporting member which supports the vibration propagating member and in which a roughness of a contact surface which contacts the vibration propagating member is 6.3S (S denotes a unit of Japanese Industrial Standard B
0601) or less; andposition coordinate calculating means for calculating coordinates of a position where the vibration generating means which has come into contact with the vibration propagating member on the basis of a detection signal from the vibration detecting means. - View Dependent Claims (12, 13)
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Specification
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- Resources
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Current AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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Original AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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InventorsYoshimura, Yichiro, Kobayashi, Katsuyuki, Kamono, Takeshi, Yanagisawa, Ryozo, Kaneko, Kiyoshi, Taniishi, Shinnosuke
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Primary Examiner(s)SCHREYER, STAFFORD
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Application NumberUS07/530,480Time in Patent Office207 DaysField of Search178/18, 178/19, 340/706US Class Current178/18.04CPC Class CodesG06F 3/0433 in which the acoustic waves...
