| 摘要 |
<p>PURPOSE:To make high-precision warning indication possible without providing a special circuit by using the electric charge for commutation to give warning only when dimming is not performed. CONSTITUTION:Before the start of light emission, electric charge is stored in a main capacitor MC and a capacitor Cd for storage of commutation electric charge by a DC power source DC, and a warning indicator IND is not operated because a capacitor C0 for commutation has not electric charge by a resistance R9. After light emission, the capacitor C0 is charged; but if the quantity of emitted light is dimmed, electric charge is not stored there. Meanwhile, if the quantity of emitted light is not dimmed, electric charge is stored in the capacitor C0 as it is, and this electric charge is discharged through a resistance R10, and a transistor Q2 is made conductive to light a light emitting diode LED continuously, thus giving warning.</p> |
