摘要:
A lamp according to the present invention includes: a line portion which blocks a part of light proceeding from a light emitting unit in a direction perpendicular to a tube axis direction; and a raised portion which blocks the light proceeding from the light emitting unit in the direction perpendicular to the tube axis direction that is not blocked by the line portion. The raised portion has an end portion having a linear shape in the tube axis direction, the end portion being an end portion of a section of the raised portion that blocks light.
摘要:
A spontaneous break in a glass tube can be sufficiently suppressed in a hot cathode low pressure discharge lamp. A hot cathode low pressure discharge lamp (10) includes a glass tube (1) in which a filament (2) is arranged. The glass tube (1) has a cross section that is flat in configuration, and a flattening x and a thickness ratio T satisfy the below expression, where the flattening x is a ratio A/B between a major diameter A and a minor diameter B of the cross section of the glass tube, the thickness ratio T is a ratio t/A between a thickness t of the glass tube and the major diameter A of the cross section of the glass tube, a=−0.809, b=0.728, c=−3.46, d=−0.0689, e=0.926, and f=−2.12. 0
摘要:
An electrodeless discharge lamp operating device including a light-transmitting discharge bulb 120, an induction coil including a core 103 and a coil 104, and a ballast circuit 140 for supplying a high-frequency power to the induction coil. The operating frequency of the ballast circuit 140 is in the range of 80 kHz to 500 kHz, and where the operating frequency of the ballast circuit 140 is f (kHz) and the power input to the discharge bulb 120 is P (W), the rare gas pressure p (Pa) in the discharge bulb 120 satisfies the relationship of the following expression: p ≥ A P - B f 2 - C [ Expression 1 ] (where A, B and C are constants having the following values: A=4.0×104, B=3.5×104 and C=6.2), and the power input P to the discharge bulb 120 is 7 W at minimum and 22 W at maximum.
摘要:
The induction coil core used for an induction coil of a discharge lamp, the discharge lamp including: a bulb containing discharge gas inside; and the induction coil for generating an electromagnetic field with a frequency in a range of 50 kHz to 1 MHz inclusive in the bulb. The core is made of a Mn—Zn polycrystalline ferrite and has a Curie temperature of 270° C. or more.
摘要:
An electrodeless discharge lamp and an electrodeless discharge lamp apparatus which prevent the devitrification are provided, where the devitrification occurs due to the use of, as a luminescent substance, a metal halide, particularly a compound made up of a group IIIB metal and a halogen. The inventors recognize the cause of the devitrification as follows: atoms of the metal are dissociated from the luminescent substance and precipitate on the surface of the arc tube wall to melt it as the luminescent substance is excited and emits light. Based on this recognition, a substance is added to the interior of the arc tube to prevent the melting of the arc tube wall and extend the life of the lamp. More specifically, the added substance is another metal halide which contains a halogen, but the valence of the metal of the added metal halide is larger than that of the luminescent-substance metal halide. In addition to this, it is possible to control the ratio of the halogen in the arc tube by controlling the amount of the added metal halide. With this construction, occurrence of the devitrification is prevented while maintaining the discharge stability. The devitrification can also be prevented by adding a simple substance of the metal constituting the luminescent-substance metal halide.