Title:
【発明の名称】座標入力装置
Document Type and Number:
Japanese Patent JP2612055
Kind Code:
B2
Abstract:
PURPOSE:To input coordinates highly accurately by detecting oscillation, which is inputted by an oscillating pen, by plural sensors to be provided in an oscillation transmitting board and obtaining a coordinate input point based on first and second oscillation transmitting times. CONSTITUTION:A user has an oscillating pen 3 by a hand and inputs the coordinates in a position on an oscillation transmitting board 8. The oscillation transmitting board 8 transmits the ultrasonic oscillation, which is received from the oscillating pen 3, to oscillation sensors 6a-6c. Signals to be detected by the sensors 6a-6c are respectively given to a signal waveform detecting circuit 9 and the detecting circuit 9 obtains the oscillation transmitting speed with a group velocity based on the envelope signal of the respective detecting signals and obtains the transmitting time with a phase velocity based on the detecting signal. An arithmetic control circuit 1 can obtain an exact distance from the coordinate input point to the respective sensors 6a-6c based on the both transmitting times.
Inventors:
Kiyoshi Kaneko
Katsuyuki Kobayashi
Takeshi Kamono
Ryozo Yanagisawa
Taniishi Shinnosuke
Yuichiro Yoshimura
Katsuyuki Kobayashi
Takeshi Kamono
Ryozo Yanagisawa
Taniishi Shinnosuke
Yuichiro Yoshimura
Application Number:
JP28386188A
Publication Date:
May 21, 1997
Filing Date:
November 11, 1988
Export Citation:
Assignee:
Canon Inc
International Classes:
G01B21/00; G06F3/03; G06F3/041; G06F3/043; G06F3/048; G06F3/0488; G06K11/06; (IPC1-7): G06F3/03; G06F3/03
Domestic Patent References:
| JP636619A |
Attorney, Agent or Firm:
Yasunori Otsuka (1 person outside)