Hamamatsu-Photonics K.k.

Kazuo Ueno

Koji Matsushita

Yoshinobu Ito

Kouzou Adachi

Takamasa Tanaka

A control circuit for a discharge lamp, which can improve the lighting performance of the discharge lamp while realizing low power consumption, and a light source device are provided. The resistance value of the variable resistor (R, R) is not switched to the low resistance (R) for steady discharge at the fourth time tbut is switched to the low resistance (R) at the fifth time tafter lowering of power supply to the filament. With such control, a change in the lamp impedance is absorbed sufficiently by the variable resistor while power supply to the filament is being lowered and, therefore, destabilization of discharge is reduced and the lighting performance is improved.

Controller for discharge lamp and light source device

The present invention relates to a light source apparatus with a structure that enables the brightness of a gas discharge tube to be stabilized and facilitates gas discharge tube maintenance work. The light source apparatus has a gas discharge tube, a lamp container housing the gas discharge tube, and a base on which the lamp container is fixed. The gas discharge tube is fixed via a heat insulating member to a portion of an outer shell of the lamp container, and the heat insulating member functions to reduce heat transfer between the lamp container and the gas discharge tube to reduce the influence of temperature change, outside the lamp container, on the gas discharge tube. The lamp container also has an attachment/detachment structure for enabling attachment and detachment of the portion of the outer shell on which the gas discharge tube is fixed via the insulating member, with respect to the remaining portion of the outer shell, and whereby the attachment/detachment structure facilitates gas discharge tube maintenance work.

Light source device

A gas discharge tubeincluding a sealed containerin which a gas is sealed, an anode disposed within the sealed container, a cathodewhich is spaced from the anodein the sealed containerand generates discharge between the cathodeand the anode, a conductive partrestricting a discharge path, the conductive partbeing disposed between the anodeand the cathodeand narrowing the discharge path, wherein by providing a cathode coverwhich is made of ceramics, encloses the cathode, and has an openingat least on an electron emission side, the cathode coverincreases the heat retaining effect of the cathode, makes it easy to keep the temperature of the cathode, and reduces power consumption.

Gas discharge tube having cathode cover made of ceramics

The present invention relates to a light source apparatus with a structure that improves the positioning precision of a gas discharge tube and facilitates gas discharge tube maintenance work. The light source apparatus has a lamp container housing the gas discharge tube, and an insulating socket member that is fixed in a state of being positioned with respect to the lamp container and that is housed in the lamp container together with the gas discharge tube. The insulating socket member has a plane contacting portion put in plane contact with a stem portion of the gas discharge tube, and a pin socket member into which at least one of stem pins, held in the stem portion is inserted in an electrically contacting state. By the corresponding stem pin being inserted in the pin socket member, the gas discharge tube is fixed in a manner enabling attachment and detachment with respect to the insulating socket member, and the precision of positioning of the gas discharge tube with respect to the lamp container is thereby improved dramatically. Also, because the insulating socket member fixes the gas discharge tube in a detachable state, detachment of the gas discharge tube is facilitated and consequently, exchange of the gas discharge tube and other maintenance work are facilitated.

Growing community of inventors

Hamamatsu, Japan

Kazuo Ueno