| 摘要 |
<p>PURPOSE:To prevent the malfunction of a reflecting type photoarray due to an external light, by providing a screen for shading printed at the fitting surface side of the reflecting type photoarray of a printed-wiring board. CONSTITUTION:A reflecting type photoarray 3 is fitted at printed-wiring board 5 in a constant interval opposite to a reflecting plate 2 to rotate in accordance with a tape travelling and fixed with soldering at the rear surface of the printed-wiring plate 5. At the peripheral part to fit the reflecting type photoarray 3 of the surface of the printed-wiring board 5, a screen 4 for shading is formed by a silk printing at a constant range. By providing the screen 4 for the shading on the surface of the printed-wiring board 5, the light to transmit a molding cabinet 7 transmits the printed-wiring board 5, arrives at the reflecting plate 2, and is made incident on the reflecting photoarray 3, and such operations are interrupted on the way and the malfunction of a sensor, namely, the malfunction of a rotation detecting device is prevented.</p> |
