Hitachi Maxell, Limited

Hitachi Consumer Electronics Co., Ltd.

Hiroshi Maehara

Hiroyuki Inoue

Hideharu Saito

Takashi Omori

Cooling air conveyed through a cooling ductis supplied to a discharge lampvia a cooling air exithaving a plurality of flow pathstopartitioned by a partition plateAn air flow direction changeover sectionchanges a flow path through which the discharge lamp is supplied with the cooling air from the cooling air exit. An air flow blocking ballin the air flow direction changeover section moves by its own weight through a guide portionto thereby block the flow path of the cooling air exit. This allows the cooling air to be directed specifically toward an upper sidein a direction of gravity of a lamp bulb of the discharge lamp to eliminate a temperature difference, even if a mounting style of the discharge lamp is varied among desk mounting, ceiling mounting, and vertical mounting.

Lamp unit and projector employing same

Cooling air conveyed through a cooling ductis supplied to a discharge lampvia a cooling air exithaving a plurality of flow pathstopartitioned by a partition plate. An air flow direction changeover sectionchanges a flow path through which the discharge lamp is supplied with the cooling air from the cooling air exit. An air flow blocking ballin the air flow direction changeover section moves by its own weight through a guide portionto thereby block the flow path of the cooling air exit. This allows the cooling air to be directed specifically toward an upper sidein a direction of gravity of a lamp bulb of the discharge lamp to eliminate a temperature difference, even if a mounting style of the discharge lamp is varied among desk mounting, ceiling mounting, and vertical mounting.

Growing community of inventors

Niiza, Japan

Hiroshi Maehara