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    Temperature phase shift circuit and coordinate input apparatus.
    1.
    发明公开
    Temperature phase shift circuit and coordinate input apparatus. 失效
    根据温度和坐标输入装置的移相器电路。

    公开(公告)号：EP0663647A3

    公开(公告)日：1998-07-29

    申请号：EP94120940

    申请日：1994-12-30

    Applicant: CANON KK

    Inventor： TOKIOKA MASAKI ,  TANAKA ATSUSHI ,  YOSHIMURA YUICHIRO ,  YANAGISAWA RYOZO ,  KOBAYASHI KATSUYUKI ,  SATO HAJIME

    IPC: G01K7/25 ,  G05D23/24 ,  G06F3/033 ,  G06F3/041 ,  G06F3/043 ,  G06F3/048 ,  H03L1/02 ,  G06K11/14

    CPC classification number: G06F3/043

    Abstract: An object of the invention is to provide a coordinate input apparatus which phase-shifts an input signal in accordance with temperature and corrects a phase shift due to a change in temperature, thereby performing coordinate input. A phase shift unit of a temperature phase shift circuit is constituted by connecting two thermistors having the same temperature characteristics and two capacitors having the same capacitance to constitute a bridge circuit. An output (Eout) has a gain of 1 with respect to an input (Ein) and is phase-shifted by

    tan
    -1 [(-2ωCR)/±(1-ωCR)
    2 )]
    , where R represents a value which exponentially varies in accordance with temperature. For this reason, the output signal can be phase-shifted in accordance with a change in temperature. When this circuit is applied to a coordinate input apparatus using an ultrasonic wave vibration, the phase shift of a vibration due to variations in temperature is corrected, thereby enabling coordinate input stable with respect to changes in temperature.

    3.
    发明专利
    未知

    公开(公告)号：DE69423331T2

    公开(公告)日：2000-08-24

    申请号：DE69423331

    申请日：1994-12-30

    Applicant: CANON KK

    Inventor： TOKIOKA MASAKI ,  TANAKA ATSUSHI ,  YOSHIMURA YUICHIRO ,  YANAGISAWA RYOZO ,  KOBAYASHI KATSUYUKI ,  SATO HAJIME

    IPC: G06F3/043 ,  G06F3/033 ,  G06K11/14

    Abstract: A shift of an input coordinate by a change in temperature in a coordinate input device is prevented. An arithmetic operation and control circuit 1 applies a drive signal to a vibration pen 3 and starts a timer. The drive signal applied to the vibration pen 3 is delayed by a delay circuit 12, which drives a vibrator drive circuit 2 to generate vibration. A delay time of the delay circuit 12 is shortened as a temperature rises and a sum time of the delay generated by the delay circuit 12 and a delay generated in the vibration pen 3 as the temperature changes is constant regardless of the temperature. As a result, a vibration propagation time measured by the timer represents a net propagation time plus a constant delay time regardless of the temperature. Thus, the stable coordinate input is assured regardless of the temperature.

    4.
    发明专利
    未知

    公开(公告)号：DE69422845D1

    公开(公告)日：2000-03-09

    申请号：DE69422845

    申请日：1994-05-06

    Applicant: CANON KK

    Inventor： TANAKA ATSUSHI ,  YOSHIMURA YUICHIRO ,  YANAGISAWA RYOZO ,  KOBAYASHI KATSUYUKI ,  TOKIOKA MASAKI ,  SATO HAJIME

    IPC: G06F3/043 ,  G06F3/033 ,  G06F3/041 ,  G06F3/048 ,  G06K11/14

    Abstract: When vibration is entered on a vibration transmitting tablet, the vibration is sensed by vibration sensors attached at four corners of the tablet. When this is done, a time delay from entry of the vibration to detection thereof is measured, and the distance between each sensor and the source of the vibration is calculated in dependence upon the time delay. At this time the vibration sensors also sense reflected waves resulting from reflection of the vibration at the end face of the tablet. The larger the angle of reflection, the greater the magnitude of the reflected waves sensed. Accordingly, sensors must likely to sense reflected waves are excluded from calculation, and coordinates are calculated based upon vibration sensed by the remaining sensors only. As a consequence, a discontinuity in coordinates occurs at the boundary of a region decided by whichever of the sensors are excluded. For this reason, a weighted mean is computed of a set of coordinates calculated based upon data obtained from a set of a plurality of sensors, and the value of the weighted mean is adopted as the coordinates sought.

    6.
    发明专利
    未知

    公开(公告)号：DE69627939D1

    公开(公告)日：2003-06-12

    申请号：DE69627939

    申请日：1996-07-18

    Applicant: CANON KK

    Inventor： KOBAYASHI KATSUYUKI ,  TANAKA ATSUSHI ,  YOSHIMURA YUICHIRO ,  YANAGISAWA RYOZO ,  TOKIOKA MASAKI ,  SATO HAJIME

    IPC: G01B7/00 ,  B06B1/06 ,  G01B17/00 ,  G06F3/033 ,  G06F3/041 ,  G06F3/043 ,  G06F3/048 ,  H01L41/22 ,  G06K11/14

    Abstract: A vibration-transmitting tablet and coordinate-input apparatus at low prices, which enable to easily manage precision of vibration detection position. A vibration-input pen inputs vibration, generated by its vibrator, onto the vibration-transmitting tablet formed by polarizing a piezoelectric member in its thickness direction. When the vibration propagated on the vibration-transmitting tablet reaches four electrodes provided at predetermined positions of the vibration-transmitting tablet, electric signals based on the vibration are detected from the respective electrodes. A signal-waveform detector detects arrival of the vibration at the electrodes based on the electric signals. An arithmetic controller calculates coordinates of the vibration-input position based on arrival timings of the vibration. The arrangement of the electrodes on the vibration-transmitting tablet can be realized by etching, printing or the like, thus management of precision of vibration-detection positions can be much easier.

    7.
    发明专利
    未知

    公开(公告)号：DE69714484T2

    公开(公告)日：2002-12-19

    申请号：DE69714484

    申请日：1997-01-02

    Applicant: CANON KK

    Inventor： YOSHIMURA YUICHIRO ,  TANAKA ATSUSHI ,  YANAGISAWA RYOZO ,  KOBAYASHI KATSUYUKI ,  TOKIOKA MASAKI ,  SATO HAJIME

    IPC: G06F3/033 ,  G06F3/043 ,  G06K11/14

    Abstract: Disclosed is a coordinate input device, having a vibration transmission plate, that simplifies the measurement of a vibration transmission speed, which is used as a known constant to calculate a distance between a vibration input location and individual vibration sensors, and that ensures the accurate performance of calculations to acquire input coordinates. According to the present invention, a vibration transmission plate has anisotropic properties that are associated with two axes. As a result, the speeds at which vibrations arrive at vibration sensors differ depending on which pair of vibration sensors, 6a and 6d, or tb and 6c, is involved. Therefore, the vibration transmission speeds are measured for the individual pairs of vibration sensors, 6a and 6d, and 6b and 6c, and the measured values are stored as known values. These values are employed as constants to be used for calculations performed to acquire coordinates.

    10.
    发明专利
    未知

    公开(公告)号：DE69417358T2

    公开(公告)日：1999-10-14

    申请号：DE69417358

    申请日：1994-11-03

    Applicant: CANON KK

    Inventor： YOSHIMURA YUICHIRO ,  TANAKA ATSUSHI ,  YANAGISAWA RYOZO ,  KOBAYASHI KATSUYUKI ,  TOKIOKA MASAKI ,  SATO HAJIME

    IPC: G06F3/043 ,  G06F3/033 ,  G06F3/041 ,  G06F3/048 ,  G06K11/14

    Abstract: A coordinate input apparatus has an effective area in a vibration transmission member for inputting a vibration from a vibration generator and a computing unit that computes the coordinates of the position of the vibration generator on the basis of the delay time between the vibration generation and the detection of the vibrations by a vibration sensor. A vibration proof material is disposed in the periphery of the vibration transmission member to prevent the inputted vibrations from being reflected at the acoustic impedance boundary of the vibration transmission member. The vibration proof material is disposed so that the spacing between the edge of the effective area and the edge of the vibration proof material facing the effective area edge becomes larger with increasing distance along the effective area edge from the vibration sensor.

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