Osram Sylvania Inc.

Dana Caldwell

Ernest A Davey, Jr

Gregory Zaslavsky

David W Johnston

Arlene Hecker

Jeffrey William Holt

Gregory Zaslvasky

A high intensity discharge lamp includes an arc tube with a chemical fill, capillaries extended from the arc tube, electrodes fed through the capillaries into the arc tube, and a frit seal that seals the capillaries, where the frit seal includes silica (SiO) in a range of more than 0 wt % to less than 5 wt %, alumina (AlO), and one of dysprosia (DyO) and yttrium oxide (YO). This frit seal material can withstand a higher operating temperature so that the length of the capillaries can be reduced compared to those sealed with conventional frit seal material.

Frit seal material, lamp with frit seal, and method for sealing a high intensity discharge lamp

A ceramic arc tube having an integral susceptor for RF inductive sealing is described. The integral susceptor in the form of an electrically conductive coating is applied directly to the surface of the arc tube in the seal region. This enables RF heating which is sufficient to melt a frit material and hermetically seal the arc tube. The integral susceptor further provides for a more controlled placement of the seal.

Ceramic arc tube having an integral susceptor

A high pressure, lamp may be made in a pressure vessel by using an induction coil to melt an edge portion of a sealing wafer pressed against the circumference of an opening in the body of the lamp envelope. The pressure vessel and the lamp envelope are filled with desired fill materials. Induction heating is carried out by the induction coil and induction receiver that presses against the wafer, the lamp envelope or both to hold the melting piece or pieces in contact. The induction receiver may be fused to the lamp body forming a functional part of the overall lamp structure. The preferred resulting lamp includes a bonded metal piece that can be conveniently used for electrical or mechanical coupling or positioning of the lamp with respect to a base.

High pressure lamp bulb and method of induction sealing

Induction sealed high pressure lamp bulb

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Middleton, MA, United States of America

Dana Caldwell