Matsushita Electric Industrial Co., Ltd.

Kiyoshi Hashimotodani

Toshiaki Kurachi

Akira Hochi

Takeshi Arakawa

Katsushi Seki

Koji Miyazaki

Yuuji Omata

Koichi Katase

Mitsuharu Kawasaki

Yoshihisa Hagiwara

Kenji Itaya

Satoshi Kominami

Kenichiro Takahashi

An electrodeless discharge lamp is disclosed that comprises a bulb with a substance for electric discharge sealed therein, the bulb having a reentrant portion protruding inwardly along a Z-axis direction; an induction coil arranged in the reentrant portion, the induction coil having a magnetic core and a winding wound around the magnetic core; and a drive circuit for supplying the induction coil with a power from 50 kHz to 1 MHz. The bulb has an outer diameter from 65 mm to 75 mm in a direction orthogonal to the Z-axis direction, and the magnetic core has a length L in the Z-axis direction that is 1.05 times or more a length L' of the winding in the Z-axis direction, the length L being set to 41 mm or less.

Electrodeless discharge lamp

A bulb type electrodeless discharge lamp, comprising a recessed part (), wherein the maximum diameter of a light emitting tube () is 60 to 90 mm and the tube wall load of the light emitting tube () is 0.07 to 0.11 W/cm, and a relation between the diameter Dc of the recessed part () and an interval &#x394;h between the top of the recessed part () and the top part of the light emitting tube () meets the requirement of &#x394;h&#x2266;1.15&#xd7;Dc+1.25 [mm].

Compact self-ballasted electrodeless discharge lamp and electrodeless-discharge-lamp lighting device

An electrodeless discharge lamp operating device including a light-transmitting discharge bulb, an induction coil including a coreand a coil, and a ballast circuitfor supplying a high-frequency power to the induction coil. The operating frequency of the ballast circuitis in the range of 80 kHz to 500 kHz, and where the operating frequency of the ballast circuitis f (kHz) and the power input to the discharge bulbis P (W), the rare gas pressure p (Pa) in the discharge bulbsatisfies the relationship of the following expression: (where A, B and C are constants having the following values: A=4.0&#xd7;10, B=3.5&#xd7;10and C=6.2), and the power input P to the discharge bulbis 7 W at minimum and 22 W at maximum.

Electrodeless low-pressure discharge lamp operating device and self-ballasted electrodeless fluorescent lamp

A self-ballasted electrodeless discharge lamp includes a discharge vessel having a cavity, an induction coil that is inserted into the cavity, a ballast for supplying power to the induction coil, a case for covering the ballast, and a lamp base provided in the case. The discharge vessel is secured to the case via a holder. A part of the discharge vessel and a first portion of the holder are engaged with each other to constitute a combination structure. A second portion of the holder and a part of the case are engaged with each other to constitute a combination structure.

Self-ballasted electrodeless discharge lamp and electrodeless discharge lamp

An electrodeless discharge lamp apparatus includes an electrodeless discharge lamp, a microwave resonator, and a microwave coupler. The microwave resonator includes a conductive reflecting mirror having an opening, a conductive shield, and two opposing external electrodes provided substantially on a central axis of the reflecting mirror. The electrodeless discharge lamp is disposed between the opposing external electrodes. The focal point of the reflecting mirror is positioned between the opposing external electrodes. When microwave energy is supplied to the microwave resonator via the microwave coupler, a microwave resonant electric field occurs between the opposing external electrodes, whereby discharge of the electrodeless discharge lamp occurs.

Electrodeless discharge lamp apparatus with adjustable exciting electrodes

An electrodeless discharge lamp includes a translucent bulb enclosing a luminous material; a coil for generating an alternating magnetic field that causes discharge in the luminous material; a power source for supplying an alternating current to the coil, the coil including a core and a winding provided near the bulb; and further includes startability improving means for improving startability of the lamp by generating a portion in which the alternating magnetic field generated by the coil is intensified in the bulb.

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Takatsuki, Japan

Kiyoshi Hashimotodani