发明授权
- 专利标题: Coordinate input apparatus
- 专利标题(中): 坐标输入装置
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申请号: US905523申请日: 1992-06-29
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公开(公告)号: US5362930A公开(公告)日: 1994-11-08
- 发明人: Yuichiro Yoshimura , Atsushi Tanaka , Kiyoshi Kaneko , Katsuyuki Kobayashi , Masaki Tokioka
- 申请人: Yuichiro Yoshimura , Atsushi Tanaka , Kiyoshi Kaneko , Katsuyuki Kobayashi , Masaki Tokioka
- 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: JPX3-175008 19910716
- 主分类号: G06F3/043
- IPC分类号: G06F3/043 ; G06F3/033 ; G08C21/00
摘要:
A coordinate input apparatus according to the present invention eliminates distortion caused by interference of a asymmetrical plate wave with an asymmetrical plate wave from the vibrations which are detected after they have been propagated in a vibration transmitting member and performs a highly accurate position coordinate detection. The vibrations of a pen which is brought into contact with the vibration transmitting member are detected by sensors provided on both the front and rear surfaces of the vibration transmitting member to determine a coordinate of a position where the vibrating pen has been brought into contact. At that time, the vibration sensors mounted on the front and rear of the vibration transmitting member in an opposed relation detect vibrations on the two surfaces of the transmitting member. The signals which are detected by each pair of front and rear sensors represent vibrations in which the asymmetrical plate waves having the same phase and the 180.degree. out-of-phase asymmetrical plate waves are superimposed on top of one another. The signals of the two sensors are input to a differential circuit. A resultant differential signal is input to a signal waveform detecting circuit. Since the differential signal is a signal in which the asymmetrical waves are cancelled with each other and in which the asymmetrical waves are amplified by twice, reduction in the vibration detection accuracy which is caused by distortion of waveforms can be prevented.
公开/授权文献
- US5865181A Medical post operation recovery device 公开/授权日:1999-02-02