Abstract: A mercury-free vehicle discharge lamp is described as including a discharge space with electrodes, wherein a spherical length b, which is a length in a tube axial direction of the light emitting part is 7.5 mm to 8.5 mm and a thickness volume V of the light emitting part is 50 mm3 to 100 mm3, and wherein the following formula is satisfied: ?20?(a?35)×5.5+(x?13.5)×10 +(1.85?t)×100+(2.5?d)×100?20, a: power W supplied in a stable lighting time, x: pressure [atm] of rare gas sealed in the discharge space ranging 10˜17 atm, t: thickness [mm] of a part where a wall with maximum thickness and ranging 1.30˜1.85 mm, and d: inner diameter [mm] of a part where the wall with maximum thickness.

Abstract: A metal halide lamp (MHL) includes: a light-transmitting hermetic vessel made of quartz glass, including: a surrounding portion having a discharge space formed therein; and at least one sealing portion joined to the surrounding portion; electrodes sealed within the discharge space of the light-transmitting hermetic vessel; a discharge medium filled within the discharge space of the light-transmitting hermetic vessel; and at least one sealed metal foil connected to proximal ends of the electrodes and hermetically embedded within the sealing portion, the sealed metal foil being formed with height-differentiating portions comprised of laser traces on at least one of surfaces of the metal foil.

Abstract: Provided is a mercury-free vehicle discharge lamp that is stably lighted with a power of 18 to 30 W in a steady time. The lamp is defined in a light-emitting portion (11). A discharge medium including a metal halogen compound and a rare gas are sealed into the lamp. The lamp also has a discharge space in which electrodes (32) are disposed and satisfies the following equation. ?40?(a?35)×5.5+(x?13.5)×10+(1.85?t)×100+(2.

Abstract: A hollow type planar illuminating device having uniform luminance distribution over the entire light emitting is described. A reflecting surface member is arranged on the bottom side of a hollow unit case, a light emitting surface member is arranged on the side facing the reflecting surface member of the unit case, and a space sandwiched between the reflecting surface member and the light emitting surface member of the unit case forms a hollow light guide space. An LED light source unit emits light into the hollow light guide space with a light collecting lens arranged between the LED light source unit and an end surface of the hollow light guide space. The light collecting lens reduces the directivity angle of light emitted from the LED light source unit in the device thickness direction.

Abstract: A backlight for a liquid crystal display device includes a plurality of point light sources 1 arranged linearly, a light guide plate 3 having a light incident surface 3a, a reflection surface 3b and a light emitting surface 3c for emitting the light reflected by the reflection surface 3b. A light scattering pattern 31 is formed on the reflection surface 3b. A light control pattern 32 is formed on the reflection surface 3b at almost entire portions except for the light scattering pattern 31 is formed for reflecting the light introduced and for outputting from the light emitting surface 3c. A pattern less area is formed on the reflection surface 3b at a boundary portion between the light scattering pattern 31 and the light control pattern 32.

Abstract: Provided is an illumination device which is designed to have increased brightness, to provide a uniform light distribution, and to provide a thinner form to an illumination device employing an LED light source, and is equipped with direct illumination and indirect illumination functions. In the illumination device, a hollow light guide region (7) for guiding light emitted from an LED (4) is formed between a clear cover (1) and a back frame (3), and a gap (2) is formed between an LED assembly holder (6) of the back frame (3) and a side wall (1b) of the clear cover (1) opposite the holder (6).

Abstract: A low-pressure discharge lamp having a tubular glass lamp vessel 10, on an outer surface of which conductor layers are formed as electrodes 21 and 26. The ultrasonic solder dipping layers 31 and 36 are formed at both ends of the vessel 10 as conductor layers. The end surfaces of the glass lamp vessel are blasted and ultrasonic solder dipping layers are formed on the blasted surfaces 41 and 46 by ultrasonic solder dipping. Conductor layers form external electrodes 21 and 26, which are in contact with the glass surface more strongly. A low-pressure discharge lamp having the conductor layers of a uniform thickness can be mass-produced at low cost.

Abstract: Provided is a hollow type planar illuminating device having uniform luminance distribution over the entire light emitting surface. A reflecting surface member (2) is arranged on the bottom side of a hollow unit case (1), a light emitting surface member (3) is arranged on the side facing the reflecting surface member of the unit case, and a space sandwiched between the reflecting surface member and the light emitting surface member of the unit case is permitted to be a hollow light guide space (10). An LED light source unit (5) wherein many LEDs are mounted in a row on a wiring board is arranged adjacent to the both sides or one side of the hollow light guide space so that light is emitted to the hollow light guide space. Between the LED light source unit and an end surface of the hollow light guide space, a light collecting lens (9) is arranged. The light collecting lens reduces the directivity angle of light emitted from the LED light source unit in the device thickness direction.

Abstract: A foil sealed lamp including an airtight container including a discharge portion provided thereinside with a discharge space and seal parts disposed at both ends of the discharge portion; metal foils of thickness T (?m) hermetically attached to the seal portions; a pair of electrodes each having its one end connected to the metal foil and having its other end led out to the discharge space; and on the periphery of areas of connection of the metal foils with the pair of electrodes, multiple recessed portions satisfying 1.0 (?m)?D?T (?m) wherein D refers to the depth (?m), in a manner that the recessed portions do not overlap one another.

Abstract: A light reflection surface member (2) is arranged on the bottom surface of a hollow unit case (1), a light emitting surface member (3) is arranged on the upper surface side of the unit case to face the light reflection surface member, and a hollow light guide region (10) is formed by being sandwiched by the light reflection surface member and the light emitting member. On the side surface of the unit case, an LED light source (5) is arranged. The LED light source has many LEDs (7R, 7B, 7G) in rows, and each LED emits single color light of red or green or blue. On two strips of light reflection surface member in the unit case (1), a color sensor is arranged for measuring illuminance of each color light entered the hollow light guide region from the LED light source (5).

Abstract: A surface light-emitting device is disclosed, in which a plurality of spot light sources are arranged along the side surface of a housing of the device, and the light emitted from the spot light sources located at the end portions of the spot light source sequence emits a lower light flux than the average light flux of the light emitted from the other spot light sources. The spot light source sequence is, for example, an LED array including an alignment of light-emitting diodes (LEDs). The LED array includes two groups of LED elements arranged in a predetermined repetitive pattern from one and the other ends, respectively, of the LED array, and at least an LED emitting low light flux is arranged at a predetermined position in the vicinity of the center of the array. As a result, the requirement for a reduced thickness and a narrower frame can be met, while at the same time producing the white light of uniform chromaticity over the whole light-emitting surface.

Abstract: The lighting device for a discharge lamp includes a bridge type rectifying and converting circuit CR1, feedback circuits FB1, FB2, a chopper circuit CR2, a charge circuit CR3, a resonant circuit CR4 resonates with a high frequency signal and lights discharge lamp DL connected to the output end by the resonant voltage, an inverter circuit CR5 which converts the DC power stored in the charge circuit by an alternate switching action of a pair of switching elements Q1 and Q2 into high frequency AC power, and a switch device connected between a connecting point J3 of capacitors C1, C2 of the charge circuit and a connecting point J2 of a pair of rectifying elements D1, D2. The lighting device for a discharge lamp can correspond to a multiple variation of a power supply voltage by a construction which uses the same switching elements by step-up chopper circuit and by inverter circuit in common and changes duty factor of the switching elements within a predetermined range.

Abstract: In an electric bulb wherein a pair of lead-in wires 14a, 14b for suspending a filament 16 is supported with a space by heating and melting a glass bead 15 made of glass, a concave portions 15a, 15b are formed at the contact portion of an outer surface of the glass bead 15 and the lead-in wires 14a, 14b, so that rising of the molten glass along the lead-in wires is suppressed. Thus, break of filament 16 owing to the generation of glass bead chippings or minute cracks is avoided, thereby providing a electric bulb having high production yield and high reliability.

Abstract: A low-pressure discharge lamp having a tubular glass lamp vessel 10, on an outer surface of which conductor layers are formed as electrodes 21 and 26. The ultrasonic solder dipping layers 31 and 36 are formed at both ends of the vessel 10 as conductor layers. The end surfaces of the glass lamp vessel are blasted and ultrasonic solder dipping layers are formed on the blasted surfaces 41 and 46 by ultrasonic solder dipping. Conductor layers form external electrodes 21 and 26, which are in contact with the glass surface more strongly. A low-pressure discharge lamp having the conductor layers of a uniform thickness can be mass-produced at low cost.

Abstract: A metal halide lamp comprises a translucent air tight vessel (1) having an arc tube section (11) forming a discharge space (13) and sealing portions (121, 122) formed at the both ends thereof, a discharge medium with which the discharge space is filled, and a pair of electrodes (31, 32) projecting into the discharge space. The discharge medium is composed of a metal halide and rare gas and essentially containing no mercury. The pair of the electrodes is composed of tungsten containing thorium oxide. Protrusions (311, 312) are formed respectively, on the pair of electrodes and arc is formed between them when the metal halide lamp is operated.

Abstract: In a back light device 10 according to the present invention, a long and flat fluorescent lamp 11 with a flat shaped cross section has a major axis and a minor axis having different lengths to each other. A light incident plane 121a of a light guide plate 12 is formed in a light emitting area of the light guide plate. A light incident plane and a major axis light emitting plane of the flat fluorescent lamp are arranged to be facing to each other. With the structure, the back light device is provided in which a thickness of the device can be made thinner than that of a direct type back light device and the width of the device can be made narrower than that of an edge light type back light device. Thus, a slim model, a narrow frame and a small size can be attained.

Abstract: A backlight for a liquid crystal display device includes a plurality of point light sources 1 arranged linearly, a light guide plate 3 having a light incident surface 3a, a reflection surface 3b and a light emitting surface 3c for emitting the light reflected by the reflection surface 3b. A light scattering pattern 31 is formed on the reflection surface 3b. A light control pattern 32 is formed on the reflection surface 3b at almost entire portions except for the light scattering pattern 31 is formed for reflecting the light introduced and for outputting from the light emitting surface 3c. A pattern less area is formed on the reflection surface 3b at a boundary portion between the light scattering pattern 31 and the light control pattern 32.

Abstract: A package for light emitting element including a package main body 1 having a bottom face 7a on which a light emitting element 2 is arranged, and a concave portion 7 which is formed in an inverted truncated cone shape by an inner wall face 7b intersecting with the bottom face 7a with a predetermined angle, and a translucent member 6 filled in the concave portion 7 of the package main body 1, the angle between the inner wall face 7b composing the concave portion 7 and the bottom face 7a is selected within ±15° of the incident critical angle in which a direct light radiated from the light emitting element 2 undergoes total reflection at the interface between the translucent member 6 and air.

Abstract: A planar discharge vessel is composed of a front board 1 made of translucent glass plate and a rear board 2 made of translucent glass plate facing to the front board 1 with a certain distance, a side wall 3 and frit glass 4, which joins a periphery of the front board 1 and the rear board 2 via a side wall 3 to form a planar discharge vessel. Phosphor layers 5a, 5b are formed on an inner surface of the front board 1 and rear board 2 and convert an ultraviolet ray radiated from the discharge medium through discharge into visible light. The external electrode 6, to which a high voltage is applied and the external electrode 7, to which a low voltage is applied are arranged alternately on the outer surface of the rear board 2.

Abstract: An inductor for performing a chopper operation by turning on or off a first switching element MOSFET Q1 and obtaining an increased voltage is arranged on the secondary side of a transformer 112 and on the basis of the turn ratio of the transformer 112, a high voltage at the time of stable lighting can be obtained from a DC power source 111 at a low voltage Vin. Further, when the on-duties of the first and second switching elements MOSFET Q1 and Q2 constituting an inverter circuit are made almost similar, the timings of application of the power to both ends of a lamp 144 can be made similar, so that the life span of the lamp can be improved.