Tokyo Shibaura Denki Kabushiki Kaisha

Hidehiro Shinada

Kiyokazu Honda

Yasuhiro Nieda

Michiyuki Sawada

Tomiyoshi Hirano

A halogen incandescent lamp performing halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800.degree. K. or more contained in the bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of the tungsten filament, respectively, and having a part sealed in the bulb, the lamp characterized in that the light-transmitting material is aluminosilicate glass having a strain point of 660.degree. C. or higher and an average thermal expansion coefficient of 41.times.10.sup.-7 to 48.times.10.sup.-7 cm/cm/.degree.C. at a temperature of 100.degree. to 300.degree. C., and that at least filament-side seal portions of the lead-in wires have a diameter of 0.2 to 0.6 mm.

Halogen incandescent lamp

Provided is a reflective lamp comprising a bulb including a front lens section and a reflective mirror section fused thereto, said front lens section consisting of glass material containing neodymium and coated on its inner surface with a first thin film reflecting infrared rays and permitting visible lights to be transmitted therethrough, said reflective mirror section consisting of glass material containing no neodymium and coated on its inner surface with a second thin film reflecting visible lights. The lamp is capable of preventing the rise in the temperature of the bulb and yet providing a sufficiently high color rendering. Further, the lamp can offer the advantage of reducing its manufacturing cost.

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Yokohama, Japan

Hidehiro Shinada