发明授权
- 专利标题： Distance measuring device, and coordinate input apparatus utilizing the same
- 专利标题（中）： 距离测量装置和利用其的坐标输入装置
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申请号： US352114申请日： 1994-12-01
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公开(公告)号： US5570302A公开(公告)日： 1996-10-29
- 发明人: Katsuyuki Kobayashi , Atsushi Tanaka , Yuichiro Yoshimura , Ryozo Yanagisawa , Masaki Tokioka , Hajime Sato
- 申请人： Katsuyuki Kobayashi , Atsushi Tanaka , Yuichiro Yoshimura , Ryozo Yanagisawa , Masaki Tokioka , Hajime Sato
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX5-302889 19931202
- 主分类号： G01B17/00
- IPC分类号： G01B17/00 ; G06F3/033 ; G06F3/043 ; G01B7/14
摘要：
In a distance measuring device for calculating the distance from the arrival time of the Lamb wave, the thickness of the propagation plate and the frequency of the Lamb wave are optimized in relation to the material of the propagation plate in order not to deteriorate the precision of distance detection even in case an approximate wave velocity is used in the calculation. The plate thickness and the frequency are so selected, in relation to the plate material, as to minimize a function G(f, d) defined by:G(f, d)=Vg.multidot.Vp/{f(Vg-Vp)}whereinf: frequencyVg: group velocity of Lamb waveVp: phase velocity of Lamb waved: plate thickness.
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