| 摘要 |
PURPOSE:To align the optical axis of a screen with a high precision and prevent slippage after alignment by fixing the position of a light source including a projection lens and providing a screen aligning base to fix the position of the screen. CONSTITUTION:The light of an electric lamp 1 is spread and projected on the front of a screen 9 by a projection lens 6, and a worker 10 can see a part of the band of light similar to a part 16 of the band of bright light by the directivity of the screen 9. Two lenticular lenses are so aligned that the part of the band of light similar to the part 16 of the band of light is placed in the center of the screen 9 and is not inclined right neither left. Positions of a diffused light source consisting of the electric lamp 1 and a frosted glass 4 and the screen 11 are fixed by a screen aligning base 8, the worker 10 brings his right eye 11 to the position, where the line connecting said diffused light source and his right eye 11 is vertical to the screen 9, to align the screen accurately.
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