Projection lens device



(57)【要約】 【課題】 放熱効果を高め、陰極線管(CRT)に投入 する電力の向上を図り、CRTの高輝度駆動を可能にす るオプチカルカップリング(OC)方式の投写レンズ装 置を提供する。 【解決手段】 OC方式の投写レンズ装置において、O Cハウジング2を空冷するための小型の送風ファン17 を設ける。OCハウジング2に複数の放熱フィン19を 設けてその放熱フィン19の間に送風ファン17からの 空気を貫流させて空冷させる。
PROBLEM TO BE SOLVED: To enhance heat radiation efficiency by providing a device with a compact air sending fan for air-cooling an OC(optical coupling) housing. SOLUTION: The air sending fan 17 is fitted to the OC housing 2 and the air duct thereof is covered with a covering plate 18. A press-contact seal is formed at the outside circumferential edge of a diaphragm 11 and this part gets in a seal groove 13 formed around a through-hole 15. By fitting a pressing cover 14, the press-contact seal part and the groove 13 are made to press-contact with the narrow pressing surface of the cover 14 so that OC solution 6 on the inside is water-tightly sealed. Besides, a heat radiation fin is installed at the positions of both ends of the fan 17 fitted to the housing 2. When the fan 17 is driven, an air current sucked from the fan 17 flows to the inside from the outside of the housing 2. By fitting the fan 17 in such a way, the housing 2 is forcibly air-cooled by the fan 17. COPYRIGHT: (C)1998,JPO




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