Abstract: An illumination device includes a light emitting module having a module substrate and a semiconductor light emitting element mounted to the module substrate, a base having a mounting surface on which the light emitting module is mounted, and a cover portion configured to cover an edge portion of the module substrate without pressing the edge portion. The module substrate includes a surface which is bonded to the mounting surface of the base through an adhesive layer. The base includes a protrusion provided to protrude upward from the mounting surface without being covered by the module substrate. The cover portion is provided on the protrusion.

Abstract: An LED unit which serves as an illumination light source includes: a light-emitting element; a circuit board provided in a drive circuit which drives the light-emitting element; a lead wire electrically connecting the light-emitting element and the drive circuit; and a case including a first opening which is an elongated opening into which the lead wire is inserted. The circuit board includes a second opening which is an elongated opening into which the lead wire is inserted, and the first opening and the second opening are disposed so that a straight line extending in a lengthwise direction of the first opening and a straight line extending in a lengthwise direction of the second opening three-dimensionally cross each other.

Abstract: An LED unit which serves as an illumination light source includes: a mounting board on which a light-emitting element, which emits light frontward, is provided; a support disposed behind the mounting board; and a case disposed so that the mounting board is sandwiched in a longitudinal direction by the case and the support. The case includes a restricting portion which restricts sideward movement of the mounting board.

Abstract: An illumination device includes a light emitting module having a module substrate and a semiconductor light emitting element mounted to the module substrate, a base having a mounting surface on which the light emitting module is mounted, and a cover portion configured to cover an edge portion of the module substrate without pressing the edge portion. The module substrate includes a surface which is bonded to the mounting surface of the base through an adhesive layer. The base includes a protrusion provided to protrude upward from the mounting surface without being covered by the module substrate. The cover portion is provided on the protrusion.

Abstract: An illumination device includes a light emitting module having a module substrate and a semiconductor light emitting element mounted to the module substrate, a base including a mounting surface on which the light emitting module is mounted, a circuit unit provided at a side of a rear surface of the base opposite to the mounting surface and configured to drive the light emitting unit; and a circuit case which accommodates and holds the circuit unit in an internal space thereof. The circuit case includes a tubular portion having an opening arranged to face the rear surface of the base and an insulation portion interposed between the rear surface of the base and the circuit unit to cover the opening of the tubular portion. The insulation portion includes a window through which the internal space of the circuit case leads to the rear surface of the base.

Abstract: An LED unit which serves as an illumination light source that is attached to lighting equipment includes: a light-emitting element; a circuit board provided in a drive circuit which drives the light-emitting element; a case inside of which the circuit board is disposed; and a connecting component at least a portion of which is disposed inside the case, for electrically connecting the lighting equipment and the drive circuit. The case includes a positioning portion which determines a position of the circuit board, and the circuit board includes an opening into which the connecting component is inserted, and which determines the position of the circuit board by way of the rim of the opening abutting the positioning portion.

Abstract: An LED unit which serves as an illumination light source includes: a light-emitting element; a circuit board provided in a drive circuit which drives the light-emitting element; a lead wire electrically connecting the light-emitting element and the drive circuit; and a case including a first opening which is an elongated opening into which the lead wire is inserted. The circuit board includes a second opening which is an elongated opening into which the lead wire is inserted, and the first opening and the second opening are disposed so that a straight line extending in a lengthwise direction of the first opening and a straight line extending in a lengthwise direction of the second opening three-dimensionally cross each other.

Abstract: An illumination light source which attaches to a lighting fixture by being rotated in a predetermined rotational direction R, the illumination light source including: a light-emitting unit (LED module), a case which includes a first opening and houses the light-emitting unit; and a translucent cover provided over the first opening, wherein the translucent cover includes a plurality of projecting portions provided at predetermined intervals in the rotational direction R, and the plurality of projecting portions each include a plurality of projections provided at a predetermined distance from each other in the rotational direction R and including a flat surface facing a direction opposite the rotational direction R.

Abstract: An LED unit which serves as an illumination light source includes: a mounting board on which a light-emitting element, which emits light frontward, is provided; a support disposed behind the mounting board; and a case disposed so that the mounting board is sandwiched in a longitudinal direction by the case and the support. The case includes a restricting portion which restricts sideward movement of the mounting board.

Abstract: The present invention aims to provide a metal vapor discharge lamp that has an outer tube less likely to break, and that is obtained at low manufacturing cost. A metal vapor discharge lamp 10 comprises: an outer tube 300 having an open end portion 301 at one end and a closed end portion 302 at another end; an inner tube 200 housed in the outer tube 300; a discharge tube 100 housed in the inner tube 200; and a base 400 attached to the open end portion 301 of the outer tube 300, wherein relationships of t?1.1×d?0.4; 0<d; and 0.3?t are satisfied, where t denotes a minimum thickness, in millimeters, of the closed end portion 302 of the outer tube 300, d denotes a shortest distance, in millimeters, in a direction of a longitudinal axis of the outer tube 300, between an inner surface 304 of the closed end portion 302 of the outer tube 300 and an outer surface 204 of an end portion 202 of the inner tube 200, the end portion 202 being located opposite from the base 400.

Abstract: A lamp having: an arc tube (30) including a main tube portion and a pair of thin tube portions (46) provided at ends of the main tube portion; and an adjacent conductor (78) including a strip-shaped metal plate. In the adjacent conductor (78), a portion of the metal plate in the direction of length thereof, from the middle of the metal plate to just before an edge thereof, is a gripping portion (92) having a shape suitable for gripping the outer circumferential of one of the thin tube portions (46). One end of the gripping portion (92) is a free end. The gripping portion (92) is disposed along an outer circumferential surface of the thin tube portion (46) so as to be in contact with the outer circumferential surface, and is elastically deformable in accordance with expansion in the radial direction of the thin tube portion (46).

Abstract: The present invention aims to provide a metal vapor discharge lamp that has an outer tube less likely to break, and that is obtained at low manufacturing cost. A metal vapor discharge lamp 10 comprises: an outer tube 300 having an open end portion 301 at one end and a closed end portion 302 at another end; an inner tube 200 housed in the outer tube 300; a discharge tube 100 housed in the inner tube 200; and a base 400 attached to the open end portion 301 of the outer tube 300, wherein relationships of t?1.1×d?0.4; 0<d; and 0.3?t are satisfied, where t denotes a minimum thickness, in millimeters, of the closed end portion 302 of the outer tube 300, d denotes a shortest distance, in millimeters, in a direction of a longitudinal axis of the outer tube 300, between an inner surface 304 of the closed end portion 302 of the outer tube 300 and an outer surface 204 of an end portion 202 of the inner tube 200, the end portion 202 being located opposite from the base 400.

Abstract: A lamp having: an arc tube (30) including a main tube portion and a pair of thin tube portions (46) provided at ends of the main tube portion; and an adjacent conductor (78) including a strip-shaped metal plate. In the adjacent conductor (78), a portion of the metal plate in the direction of length thereof, from the middle of the metal plate to just before an edge thereof, is a gripping portion (92) having a shape suitable for gripping the outer circumferential of one of the thin tube portions (46). One end of the gripping portion (92) is a free end. The gripping portion (92) is disposed along an outer circumferential surface of the thin tube portion (46) so as to be in contact with the outer circumferential surface, and is elastically deformable in accordance with expansion in the radial direction of the thin tube portion (46).

Abstract: Provided is a metal halide lamp that can (i) prevent flicker in an illuminated surface of an arc tube, which is caused by violent movement of an electric arc when the lamp is lit while being tilted, (ii) suppress an early reduction in a luminous flux maintenance factor, and (iii) suppress formation of cracks in an enclosure of the arc tube. The lamp comprises (i) an arc tube 3 that (a) is arranged inside an outer tube 2, (b) has at least one selected from the group consisting of Ce and Pr enclosed therein as a light emitting material, and (c) is made of translucent ceramic, and (ii) a sleeve 4 arranged outside the arc tube 3, so as to surround a part of a discharge space 13 in the arc tube 3 extending between a pair of electrodes 12. The relationship 0.7<L/D<3 is satisfied in the lamp, with L denoting the inter-electrode distance [mm] and D denoting a largest inner diameter [mm] of a part of the arc tube 3 surrounding the part of the discharge space 13. The relationship R/r??0.0019P+2.

Abstract: A high pressure discharge lamp includes an outer tubular bulb whose inner space is exhausted to a vacuum; an arc tube contained in the outer tubular bulb; and a voltage reducing switching element for reducing a voltage applied to the arc tube. The voltage reducing switching element includes a heat sensitive switching element and a starting-voltage reducing element which are connected in series. During a period in which the heat sensitive switching element has a predetermined temperature or higher, the heat sensitive switching element is closed to electrically connect the arc tube and the voltage reducing switching element in parallel, so that the starting-voltage reducing element is operated. During a period in which the heat sensitive switching element has a temperature lower than the predetermined temperature, the heat sensitive switching element is opened so that the starting-voltage reducing element is not operated.

Abstract: An arc tube (6) of a metal halide lamp (1) has a ceramic envelope (10), a pair of electrodes (16), and metal halides enclosed therein. The arc tube (6) satisfies the relationship EL/Di>4.0, where EL represents the distance between the pair of electrodes (16) in mm, Di represents the maximum inside diameter of the arc tube (6) measured in mm at a portion positionally corresponding to the gap between the pair of electrodes (16). In addition, the metal halides enclosed within the arc tube (6) include at least sodium halide and neodymium halide. With this configuration, the metal halide lamp (1) achieves an improved emission color characteristic, while maintaining high lamp efficiency.

Abstract: A metal halide lamp of the present invention has an arc tube formed of ceramic and a pair of opposing electrodes. This lamp includes a Pr (praseodymium) halide, a Na (sodium) halide, and a Ca (calcium) halide enclosed within the arc tube. The Pr halide content Hp [mol], the Na halide content Hn [mol], and the Ca halide content Hc [mol] satisfy the relationships of 0.4?Hc/Hp?15.0 and 3.0?Hn/Hp?25.0.

Abstract: Disclosed is a lighting system capable of preventing damage to an outer-tube resulting from an outer-tube discharge that often occurs at the end of useful life of a lamp. The lighting system includes: a metal halide lamp having an arc tube housed within an outer tube; and a lamp .lighting device for operating the metal halide lamp. The lamp lighting device includes: a power supply unit operable to supply an electric power to the metal halide lamp; a detecting unit operable to detect an electrical property of the metal halide lamp; a judging unit operable to judge, based on the detected electrical property, whether a currently occurring discharge is an outer-tube discharge; and an instructing unit operable to instruct the power supply unit to suspend or reduce the electric power supply to the metal halide lamp upon a judgment that the currently occurring discharge is an outer-tube discharge. The detection unit detects a lamp voltage.

Abstract: he present invention aims at providing a metal halide lamp having a configuration to achieve the following goals: to prevent the lamp from burning out during the life due to a rise in lamp voltage; and to obtain high luminous efficiency at the same time. The metal halide lamp 1 comprises: an arc tube 4 made of translucent ceramic and having a main tube part 6 in which a pair of electrodes 14 is disposed; and an outer tube 3 housing the arc tube 4 therein. 4.0?L/D?10.0, where L (mm) is a length of a space between the electrodes 14 and D (mm) is an internal diameter of the main tube part 6. R/r ?3.4, where R (mm) is an internal diameter of the outer tube 3 and r (mm) is an external diameter in the main tube part 6 of the arc tube 4, within a region positionally corresponding to, in a radial direction of the outer tube and the arc tube, the space between the electrodes 14, on a cross-sectional surface where an outer circumference of the arc tube 4 comes closest to an inner circumference of the outer tube 3. M?4.

Abstract: Disclosed is a lighting system capable of preventing damage to an outer-tube resulting from an outer-tube discharge that often occurs at the end of useful life of a lamp. The lighting system includes: a metal halide lamp having an arc tube housed within an outer tube; and a lamp .lighting device for operating the metal halide lamp. The lamp lighting device includes: a power supply unit operable to supply an electric power to the metal halide lamp; a detecting unit operable to detect an electrical property of the metal halide lamp; a judging unit operable to judge, based on the detected electrical property, whether a currently occurring discharge is an outer-tube discharge; and an instructing unit operable to instruct the power supply unit to suspend or reduce the electric power supply to the metal halide lamp upon a judgment that the currently occurring discharge is an outer-tube discharge. The detection unit detects a lamp voltage.