| 摘要 |
PURPOSE:To automatically change the thickness and density of a display line in accordance with the holding pressure of a light pen onto a CRT picture, by automatically detecting this holding pressure by an analog value. CONSTITUTION:A position on the CRT picture of a CRT device 23 is indicated with a light pen 15. In this case, when an electronic beam scanning on the CRT picture has arrived directly below, an optical sensor in the light pen 15 detects it and sends out an address output on its picture to an address detecting circuit 16. Also, in this case, a pressure sensor 11 in the pen 15 detects holding pressure of the pen 15 onto the CRT picture by an analog value. An operating circuit 18 operates the thickness or density of a line in the display in accordance with pressure information. |
