| 摘要 |
<p>PURPOSE:To make possible the selection of all emission modes and make the constitution of electric circuits simple and their reliability higher by using a one-circuit multicontacts switch and a separating diode. CONSTITUTION:A change-over switch Swd for selection of emission modes is constituted by a slide change-over switch of one circuit 5 contacts. Its terminals (d2) and (d3) are connected to the point of connection of automatic dimming level setting resistances R6 and R7 and the point of connection of R5 and R6, respectively. The terminal (d4) is connected to an operating voltage supplying line E1 via the time constant circuit of a capacitor C4 and a half-fixed resistance VR3 for controlling manual emission control level and is also connected to the base of a transistor Q1 for detecting emission control level via a separating diode D1. The terminal (d5) is connected to the point of connection of D1 and the base of Q1, and the terminal (d0) to an operating voltage supplying line E2. Five emission modes may be selected by changing over of this switch SWd.</p> |
