| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a screen device allowing further cost reduction and improvement in positioning accuracy. <P>SOLUTION: The screen device includes, as detection means 2, a screening disk 21 which has a plurality of slits formed at prescribed intervals along an outer peripheral edge part and rotates in conjunction with rotation of a take-up roller 10, and a photosensor 22 which counts the slits in the screening disk 21. The screening disk 21 is configured to have an outer diameter equal to or larger than an outer diameter of the take-up roller 10, and is provided coaxially with the take-up roller 10 on one end side thereof without interposing a gear to rotate integrally with the take-up roller 10. <P>COPYRIGHT: (C)2012,JPO&INPIT |
