Ushio Denki Kabushiki Kaisha

Toshiyuki Shima

Osamu Inoue

Shinkichi Morimoto

Shinji Suzuki

Akiyasu Yamaguchi

Kiyotada Nakamura

Keisuke Ookubo

A short arc lamp in which cylindrical retaining bodies can be easily and reliably attached in upholding parts of the electrodes on a temporary basis and in which also the disadvantages which are caused by an anomalous discharge immediately after starting of lamp operation can be eliminated are achieved in a short arc lamp in which a cathode and an anode opposite one another in an arc tube having side parts on opposite sides, in which the upholding parts of the cathode and anode electrodes are inserted and held in cylindrical retaining bodies, and in which the cylindrical retaining bodies are supported in the shrunken regions of the side tubes by the upholding parts of the electrodes being wound with coil components which border the faces of the cylindrical retaining bodies that face the electrodes, and by the cylindrical retaining bodies being temporarily attached by these coil components. Furthermore, as the coil components, a coil wound which is formed of a flexible foil lead that has been bent in the middle region of the flexible coil lead and wound so that the two ends of the flexible coil lead are located on the side closest to the electrode.

Short arc lamp with crack-preventing electric mounting arrangement

A surface activating process in which treatment can be performed within a short time and in which activation of undesired areas does not occur is achieved by concentrating ultraviolet light with wavelengths from 200 nm to 300 nm by means of an oval focussing mirror. The ultraviolet light is incident in parallel on a mask via a first reflector, an integrator lens, a shutter, a second reflector, and a collimator, and is radiated through the mask onto a workpiece to activation a surface area of the workpiece. The arc length of the lamp is selected to be within a range from 7.5 to 29 mm to obtain a radiation intensity which is sufficient for surface activation. Furthermore, the relationship .alpha.&gt;1.5.degree. and the relationship d.times.tan .alpha..ltoreq.0.1 W are satisfied at the same time, where .alpha. is the visual angle of the ultraviolet light, d is the thickness of an oxygencontaining gas layer which is formed between the mask and the workpiece, and W is the width of a minimum unit of the surface areas of the workpiece to be activated. In this way entry of adverse light can be prevented.

Surface activating process, and device and lamp for performing said

A lamp in which a stable, long-term luminous operation can be accomplished is achieved by the fact that, in a mercury lamp of the short arc type in which a cathode and an anode located next to one another within an arc tube and in which both ends of the arc tube are provided with hermetically sealed portions, the cathode is installed on the tip of a rod-shaped component which extends from a respective one of the hermetically sealed portions, the cathode having a greater outer diameter than the rod-shaped component on which it is installed, and the rear end of the cathode tapering toward the respective hermetically sealed portion.

High power mercury lamp of the short arc type with specific cathode

A mercury lamp of the short arc type in which tantalum can absorb impurity gases to a sufficient degree even if the inside of the arc tube reaches a high temperature is achieved by providing an arc tube, within which mercury and an inert gas are encapsulated, with a pair of electrodes disposed opposite each other within the arc tube, each of the electrodes being supported by a respective terminal post, tantalum being provided on the terminal post of one of the electrodes, and by ensuring that both of the relationships (D2/D1)&gt;1.3 and the relationship 0.2.ltoreq.(D2/D1).sup.2 /L.ltoreq.0.5 are satisfied at the same time, where D1 is an outer diameter of the terminal post in millimeters, D2 is an outer diameter of the electrode supported by the respective terminal post in millimeters, and L is a distance between a tip of the electrode on which the tantalum is provided and the tantalum on the terminal post of that electrode.

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Himeji, Japan

Toshiyuki Shima