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Priority to JP1987170719UpriorityCriticalpatent/JPH074317Y2/ja
Publication of JPH0178141UpublicationCriticalpatent/JPH0178141U/ja
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Publication of JPH074317Y2publicationCriticalpatent/JPH074317Y2/ja
G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
