| 摘要 |
PURPOSE: In opening and closing the shutter of a disk cartridge, there is a gap owing to the restorative power of a spring. Pollutant like dust flows through this gap and a disk can be contaminated. It makes errors in a disk recording and reproducing. CONSTITUTION: A cartridge shutter opened to both sides in use and closed in ejection is formed by making the lower part of the cartridge shutter(14,14') bigger than the upper part of it. And place elasticity material(24,24') to make recovery power pushing shutter faces lower lateral way in closing shutters. This prevents disks from outer pollution like dust, protects discs and reduces errors in recording and reproducing.
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