| 摘要 |
PURPOSE:To make easy the fitting and removing of the filter and to make easy the maintenance and checking of the filter by circumscribing and supporting a filter with at least three cylindrical rollers and with at least one roller with one groove. CONSTITUTION:An ND filter 20 and color correcting filters 200 and 204 are abutted and supported from the outer peripheral side by three cylinderical rollers 214, 216 and 218 and a roller with a groove arranged at about 120 deg. interval, and in the upward and downward directions, the regulation is executed by inserting the outer peripheral surface 210 of a metallic frame 208 into a roller 220 with a groove having the V-shaped groove. A roller 214 is rotatably fitted to a shaft 222 and a roller 220 with a groove is rotatably fitted to a common shaft 226, and at the common shaft 226, three rollers 230, 232 and 234 with the shaft to support other remaining filters 200 and 204 are fitted rotatably. Further, at a supporting plate 206, a post 254 is erected, and three supporting plates 256 are provided in the horizontal direction, and when the maintenance and checking of the filter are executed, respective upper and lower filters themselves will not be contacted when the supporting roller is removed.
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