Koito Manufacturing Company, Ltd.

Toshiaki Mitobe

Koichi Nakamura

Michihiro Mabe

Makoto Michino

Kunimasa Mochizuki

A vehicle lamp has a red bulb which is made by coating its exterior surface with a red paint including iron oxide as a red pigment. A mean particle size of the iron oxide is controlled to a range of approximately 10 to 100 nm, and a PWC concentration of the iron oxide is controlled to a range of approximately 60 to 90%. As a result, a red marker lamp can have an appropriate luminous flux (120&#xb1;20% lm) and desirable chromaticity (y&#x3c;0.335 and z&#x3c;0.008) and satisfactory heat resistance (350&#xb0; C. or higher).

Vehicle lamp

An electric light bulb that minimizes peeling of the coating, suppresses reduction of the number of light fluxes, and is easy to manufacture is described. The electric light bulb has a glass bulb having a straight tube and a leading edge portion that is continuous with the straight tube. A blue coating is applied onto the straight tube, and a white or silver shield coating is applied onto the leading end portion

Electric light bulb and coating method of electric light bulb

A method for producing a light source bulb wherein a shielding film is formed on the outer peripheral face of a glass tube extending along a reference bulb axis, such that a coating for providing the shieiding film can be applied efficiently and precisely onto the outer peripheral face of the glass tube even though the shielding film is complicated in configuration. The method includes horizontally placing a light source bulb, vertically placing a coating discharging portion, moving a front edge face of the coating discharging portion close to the outer peripheral face of the shroud tube, and applying the coating by moving the coating discharging portion and the light source bulb relative to each other along a reference bulb axis and rotating the light source bulb upon the reference bulb axis while the coating is being discharged from the coating discharging portion.

Growing community of inventors

Shizuoka, Japan

Toshiaki Mitobe