| 摘要 |
PURPOSE:To decrease the scanning time with optional column and row information, by actuating a current detecting circuit with the row and column designation signals which are supplied from the row and column drive circuits corresponding to the row and column of a matrix circuit consisting of a resistance and a diode. CONSTITUTION:A row changeover contact ex<0> is open with a contact P0 to be scanned of a marker 0 closed, and a row designating relay RX0 of the marker O is designated. Thus a current flows through a diode DA00, resistances R00 and DD00 plus a contact rx0 of a row drive circuit RDCS and the contact ex<0>. However, a relay SX0 does not work. When the contact P0 is opened, a current flows through the contct er<0> or a relay SX0, DB00, R00, D00 plus contacts rx0 and ex0 to actuate the relay SX. Thus a contact SX0 is closed to latch FF0. In case the contact ex<0> is closed with the contact P0 opened and a column designating relay RY0 of the marker O is designated, a current flows from the contact ex<1>, a relay SY0, DC00, R00 and DE00 and through a contact ry<0> of a column drive circuit RDCRY and the contact ex<0>. Thus the contact sy0 is closed to latch the EF0. |
