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Standard
| GB/T 27509-2011 Overhead projectors—Projection stages dimensions (English Version) |
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Detail of GB/T 27509-2011
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Introduction of GB/T 27509-2011
本标准规定了A型(250mm×250mm)和B型(285mm×285mm)透射式投影器的投影台画面区尺寸、定位销位置、尺寸和平整区尺寸以及投影头支承杆的位置，两种台面投影器的显著不同在于画面区域尺寸，适用于A型(250mm×250mm)和B型(285mm×285mm)透射式投影器。
Contents of GB/T 27509-2011