Abstract: The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (1a); sealing portions that are connected with both ends of the spherical portion; an electrode (2a) that is sealed to each of the sealing portions; and a metal foil (3a) that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube (8) on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter ? of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/??1.

Abstract: Backlight unit (10), illumination device (400) and display device (1) capable of local dimming control while achieving high contrast are provided. Backlight unit (10) includes light guide plate (100), which includes layered plate-like optical members (110, 120), and light sources (12). A main surface (111, 121) of each optical member (110, 120) is partitioned into areas including one or more emergence areas and non-emergence areas. When light is incident on each optical member (110, 120) through a side surface thereof, light emerges from emergence areas but does not emerge from non-emergence areas. The optical members (110, 120) are layered such that each non-emergence area of one optical member (110) overlaps a different one of emergence areas of another (120). Light sources (12) are arranged to face the side surface of each optical member (110, 120) and are capable of local dimming control by being lit with light emitted therefrom adjusted.

Abstract: The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (1a); sealing portions that are connected with both ends of the spherical portion; an electrode (2a) that is sealed to each of the sealing portions; and a metal foil (3a) that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube (8) on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter ? of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/??1.

Abstract: A fluorescent lamp has a glass container that has a phosphor layer formed on an inner surface of the glass container, and that is hermetically sealed, wherein phosphors of the phosphor layer include a blue phosphor, a green phosphor, and a red phosphor, a main luminescence peak of the blue phosphor exists in a wavelength region in a range of 430 nm to 460 nm inclusive, a half-value width of a spectrum of the main luminescence peak of the blue phosphor is less than or equal to 50 nm, a main luminescence peak of the green phosphor exists in a wavelength region in a range of 510 nm to 530 nm inclusive, a half-value width of a spectrum of the main luminescence peak of the green phosphor is less than or equal to 30 nm, and a main luminescence peak of the red phosphor exists in a wavelength region in a range of 600 nm to 780 nm inclusive, and a difference between a wavelength of the main luminescence peak of the blue phosphor and a wavelength of the main luminescence peak of the green phosphor is in a range of 70 n

Abstract: A discharge lamp 50 comprises a luminous bulb 10 in which a luminous material 18 is encapsulated and a pair of electrodes 12 are arranged to be opposed to each other, and sealing parts (11a, 11b) that are formed at both ends of the luminous bulb 10 and in which metal foil structures 13 electrically connected to the pair of electrodes 12, respectively, are sealed. At least one of the metal foil structures 13 is composed of a first metal foil 13a, a second metal foil 13b and a metal bar 21 coupling both of them. At least one sealing part 11b of the sealing parts includes a cavity 20 around the position where in the sealing part the metal bar 21 is located, and at least a rare gas is encapsulated in the cavity 20.

Abstract: A metal halide lamp according to the present invention includes a discharge tube (3) having an envelope (18) that is formed of a translucent ceramic and has a main tube portion (16), a first slender tube portion (17a) and a second slender tube portion (17b) respectively formed in both end portions of this main tube portion (16), and a first electrode lead-in member (21) and a second electrode lead-in member (22) having a first electrode portion (25a) and a second electrode portion (25b) formed in their respective tip portions. The individual electrode lead-in members (21, 22) are inserted in the respective slender tube portions (17a, 17b), and a gap (23) is formed respectively between the slender tube portion (17a, 17b) and the electrode lead-in member (21, 22).

Abstract: A discharge lamp 50 comprises a luminous bulb 10 in which a luminous material 18 is encapsulated and a pair of electrodes 12 are arranged to be opposed to each other, and sealing parts (11a, 11b) that are formed at both ends of the luminous bulb 10 and in which metal foil structures 13 electrically connected to the pair of electrodes 12, respectively, are sealed. At least one of the metal foil structures 13 is composed of a first metal foil 13a, a second metal foil 13b and a metal bar 21 coupling both of them. At least one sealing part 11b of the sealing parts includes a cavity 20 around the position where in the sealing part the metal bar 21 is located, and at least a rare gas is encapsulated in the cavity 20.

Abstract: A mercury-free high-intensity discharge lamp operating apparatus includes a horizontally operated high-intensity discharge lamp including an arc tube in which a luminous material is enclosed and a pair of electrodes are arranged in the arc tube; a ballast including an alternating current generation means for supplying alternating current to the pair of electrodes; and a magnetic field application means for applying in substantially vertical direction a magnetic field having a component that is substantially perpendicular to a straight line connecting heads of the pair of electrodes; wherein mercury is not included as the luminous material in the arc tube.

Abstract: A high-intensity discharge lamp includes an arc tube including a pair of electrodes opposed to each other therein; and a trigger wire made of a conductive material provided in an outer circumference of the arc tube. The trigger wire is turned to be in a conductive state with one electrode of the pair of electrodes when a start-up voltage is applied across the pair of electrodes, and discharge is started between the pair of electrodes in a state where an electrical field is formed between the trigger wire that is in the conductive state and the other electrode of the pair of electrodes.

Abstract: In a high intensity discharge lamp, at least one of an arc bend amount and an apparent width of arc is controlled by a simple configuration at low cost. A high intensity discharge lamp system 110 has a high intensity discharge lamp 111 and an operating circuit 113 for driving the high intensity discharge lamp 111. In the high intensity discharge lamp 111, a rare gas and a filling material 136 containing a metal halide as a light generating substance are enclosed in the arc tube 121 provided with a pair of electrodes 122a and 122b. The lamp system is disposed such that the line connecting the electrodes 122a and 122b is horizontal, and by applying a magnetic field having a vertical magnetic flux thereto and by varying the frequency of alternating current for driving the high intensity discharge lamp 111, at least one of an arc bend amount and an apparent width of arc can be easily controlled.

Abstract: A high-intensity discharge lamp includes an arc tube including a pair of electrodes opposed to each other therein; and a trigger wire made of a conductive material provided in an outer circumference of the arc tube. The trigger wire is turned to be in a conductive state with one electrode of the pair of electrodes when a start-up voltage is applied across the pair of electrodes, and discharge is started between the pair of electrodes in a state where an electrical field is formed between the trigger wire that is in the conductive state and the other electrode of the pair of electrodes.

Abstract: A mercury-free high-intensity discharge lamp operating apparatus includes a horizontally operated high-intensity discharge lamp including an arc tube in which a luminous material is enclosed and a pair of electrodes are arranged in the arc tube; a ballast including an alternating current generation means for supplying alternating current to the pair of electrodes; and a magnetic field application means for applying in substantially vertical direction a magnetic field having a component that is substantially perpendicular to a straight line connecting heads of the pair of electrodes; wherein mercury is not included as the luminous material in the arc tube.