| 摘要 |
PURPOSE:To effect improvement of positioning accuracy with reduced image distortion of display unit and effect due to visually viewed angle difference, by allowing the reference position pattern originated from a reference pattern generator to be displayed in an overlapped manner with an image signal of each reflection bright point image by the positioning symmetrical planes obtained in the image developing member. CONSTITUTION:An image signal of reflection bright point images on two points an positioning symmetrical planes developed by a camera constructed of an oscillator 73 delivering clock signal CLK, horizontal synchronizing signal HT, and vertical synchronizing VT to ITV71, ITV driving circuit 72 is supplied to an overlapping circuit 9. Further, a marker pattern signal is supplied to the circuit 9 which indicates the reference position from a pattern generator 10 and upon overlapping with the image signal, it is displayed on a TV monitor 8. Accordingly, even if at an image distortion caused by horizontal as well as vertical scanning voltage fluctuations, etc., positions of bright point image and marker pattern will not be deviated and high accuracy positioning becomes available. |
