Ushio Denki Kabushiki Kaisha

Katsuhiko Miahara

Hiroshi Sugahara

Masashi Dan

Minoru Asao

Yutaka Yamanizu

In order to prevent a short lifetime of a lamp experiencing an extending downward of the coil under application stress when the coil is in a vertical configuration, there is provided an incandescent lamp in which a filament is stored in a bulb, and the filament is arranged in a vertical orientation and held by supporting element, where the filament is composed of a double coil in which a primary coil having a strand wound thereon is doubly wound, and the primary coil is more closely wound at the upper part of the filament than at the lower part of the filament.

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Himeji, Japan

Katsuhiko Miahara