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    • 3. 发明专利
    • DIRECTION DISPLAY UNIT
    • JPS5546124A
    • 1980-03-31
    • JP11925378
    • 1978-09-29
    • TOKAI RIKA CO LTD
    • OOHASHI HIROSHI
    • G01C17/36G01C17/32
    • PURPOSE:To enable to easily visualize the direction of indication, by displaying the two directions with two scale display panels and avoiding the pointer from greatly being indicated to opposite side on the way of direction display. CONSTITUTION:When the vehicle advances north, the direction signal generator 8 turned with the motor 12 produces sinusoidal signal indicating the peak with the direction toward north and the rectangular wave generator 13 produces the rectangular wave of one cycle per one revolution of the motor 12, then a pulse signal is delivered from the reference direction detector 9 at 3/4 from the leading of the rectangular wave to reset FF18 via AND 16 and to illuminate the lamp 5 with the drive circuit 20. The output from the generator 13 is triangle wave with the triangle wave generator 14 and it is fed to the sample hold circuit 10 to hold the voltage value when the pulse signal from the detector 9 is inputted. Accordingly, taking the minimum voltage as V1 and maximum valotage as V2, (V2-V1)/2 is inputted to the meter drive circuit 21 from the circuit 10 to position the pointer 7 to azimuth N or S and to illuminate the lamp 5.