Abstract: A light emitting device capable of adjusting light color by means of power input to two sets of electrode terminals, comprising a plurality of light emitting circuits having semiconductor light emitting elements connected in parallel between each of the two sets of electrode terminals. At least one of the light emitting circuits provided between the respective set of the electrode terminals is an individual light emitting circuit through which a current flows by energization between either set of the electrode terminals. At least one of the light emitting circuit is a shared light emitting circuit having a common wiring section through which a current flows by energization between any set of the electrode terminals. An emission color by energization between each set of the electrode terminals is different from each other.

Abstract: A light emitting device is provided with a first LED element array and a second LED element array, each of which has one or more LED elements. The first LED element array and the second LED element array are connected in series with each other. At least one of which connected in parallel with a bypass circuit that comprises a resistor and a diode. A threshold voltage of the LED element array connected in parallel with the bypass circuit is higher than a threshold voltage of the diode, and an emission color by emission of the first LED element array is different from an emission color of light by the emission of the second LED element array.

Abstract: A light emitting device which can adjust color temperature as power is supplied from a single power source and a lighting device including the light emitting device are provided. The light emitting device includes an anode electrode land; a cathode electrode land; a first light emitting unit and a second light emitting unit which are electrically connected to the anode electrode land and the cathode electrode land, are adjacently provided in parallel with each other; and a low pass filter including a capacitance member which is provided in parallel with the first light emitting unit and the second light emitting unit, and a resistance member which is provided in series with the first light emitting unit and the second light emitting unit, in which electric resistance of the first light emitting unit is larger than electric resistance of the second light emitting unit.

Abstract: A light emitting device (10) includes light emitting elements (12), conductor wirings (14), and alignment marks (18) formed on a substrate (11). The alignment marks (18) and the conductor wirings (14) are formed by printing.

Abstract: There is provided a light-emitting device including an anode electrode land, a cathode electrode land, and a first light-emitting unit and a second light-emitting unit electrically connected to the anode electrode land and the cathode electrode land and provided in parallel to each other, in which the first light-emitting unit and the second light-emitting unit each include blue light-emitting LED chips, the first light-emitting unit and the second light-emitting unit have different amounts of change in luminous flux with respect to an amount of change in current applied between the anode electrode land and the cathode electrode land, and a color temperature generated from an entire light-emitting unit including the first light-emitting unit and the second light-emitting unit can be adjusted.

Abstract: A light emitting device which can adjust color temperature as power is supplied from a single power source and a lighting device including the light emitting device are provided. The light emitting device includes an anode electrode land; a cathode electrode land; a first light emitting unit and a second light emitting unit which are electrically connected to the anode electrode land and the cathode electrode land, are adjacently provided in parallel with each other; and a low pass filter including a capacitance member which is provided in parallel with the first light emitting unit and the second light emitting unit, and a resistance member which is provided in series with the first light emitting unit and the second light emitting unit, in which electric resistance of the first light emitting unit is larger than electric resistance of the second light emitting unit.

Abstract: In a light-source device (10) of this invention, integrated light emission intensity from 460 nm to 500 nm is higher than integrated light emission intensity from 415 nm to 460 nm in an emission spectrum of white light. This allows provision of a light-source device which emits white light easy on a human eye.

Abstract: A light emitting device which can adjust color temperature as power is supplied from a single power source comprises an anode electrode land; a cathode electrode land; a first light emitting unit and a second light emitting unit; a low pass filter including a capacitance member which is provided in parallel with the first light emitting unit and the second light emitting unit; and a resistance member which is provided in series with the first light emitting unit and the second light emitting unit. A phosphor which is included in the first light emitting unit and the second light emitting unit includes a red phosphor which is excited by the primary light that is emitted from the LED element and emits light with a peak light emission wavelength into a red region, and a green phosphor which is excited by the primary light that is emitted from the LED element and emits light with a peak light emission wavelength into a green region.

Abstract: A light emitting device includes: a ceramic substrate; a plurality of LED chips; a printed resistor(s) connected in parallel with the plurality of LED chips; a dam resin made of a resin having a low optical transmittance; a fluorescent-material-containing resin layer; and an anode-side electrode and a cathode-side electrode, (a) which are provided on a primary surface of the ceramic substrate so as to face each other along a first direction on the primary surface and (b) which are disposed below at least one of the dam resin and the fluorescent-material-containing resin layer. With the configuration in which a plurality of LEDs, which are connected in a series-parallel connection, are provided on a substrate, it is possible to provide a light emitting device which can achieve restraining of luminance unevenness and an improvement in luminous efficiency.

Abstract: There is provided a light-emitting device including an anode electrode land, a cathode electrode land, and a first light-emitting unit and a second light-emitting unit electrically connected to the anode electrode land and the cathode electrode land and provided in parallel to each other, in which the first light-emitting unit and the second light-emitting unit each include blue light-emitting LED chips, the first light-emitting unit and the second light-emitting unit have different amounts of change in luminous flux with respect to an amount of change in current applied between the anode electrode land and the cathode electrode land, and a color temperature generated from an entire light-emitting unit including the first light-emitting unit and the second light-emitting unit can be adjusted.

Abstract: A light emitting device which can adjust color temperature as power is supplied from a single power source and a lighting device including the light emitting device are provided. The light emitting device includes an anode electrode land; a cathode electrode land; a first light emitting unit and a second light emitting unit which are electrically connected to the anode electrode land and the cathode electrode land, are adjacently provided in parallel with each other; and a low pass filter including a capacitance member which is provided in parallel with the first light emitting unit and the second light emitting unit, and a resistance member which is provided in series with the first light emitting unit and the second light emitting unit, in which electric resistance of the first light emitting unit is larger than electric resistance of the second light emitting unit.

Abstract: The color purities of blue-green light and yellow or yellow-green light are enhanced. A light emitting device (100) configured to emit at least blue-green light and yellow or yellow-green light includes a substrate (51), an LED chip group, and a sealing resin part (50) collectively sealing the LED chip group, wherein the LED chip group at least includes a green LED chip (GB), a green LED chip (GY), a blue LED chip (B), and a red LED chip (R), and the green LED chip (GB) has a dominant wavelength shorter than a dominant wavelength of the green LED chip (GY).

Abstract: A light emitting device that can adjust a color temperature by using power supply from a single power source and a lighting device including the light emitting device are provided. A light emitting device includes a reflector formed of a housing having an opening at an upper portion, an anode electrode terminal and a cathode electrode terminal that are disposed on a side wall or a bottom surface of the housing, and a first light-emitting portion and a second light-emitting portion that are arranged in parallel inside the reflector so as to be electrically connected to the anode electrode terminal and the cathode electrode terminal and that are adjacent to each other. The first light-emitting portion includes a first resistance member. The color temperature of light emitted from an entire light-emitting portion including the first light-emitting portion and the second light-emitting portion can be adjusted.

Abstract: A light emitting device includes: a ceramic substrate; a plurality of LED chips; a printed resistor(s) connected in parallel with the plurality of LED chips; a dam resin made of a resin having a low optical transmittance; a fluorescent-material-containing resin layer; and an anode-side electrode and a cathode-side electrode, (a) which are provided on a primary surface of the ceramic substrate so as to face each other along a first direction on the primary surface and (b) which are disposed below at least one of the dam resin and the fluorescent-material-containing resin layer. With the configuration in which a plurality of LEDs, which are connected in a series-parallel connection, are provided on a substrate, it is possible to provide a light emitting device which can achieve restraining of luminance unevenness and an improvement in luminous efficiency.

Abstract: A light source device is obtained, which has an enhanced light distribution characteristic with sufficiently homogeneous diffused light and can be readily manufactured with a simple configuration. The light source device has a substrate 2, a board-like first reflector 3 erected vertically to traverse a center section on the substrate 2 while both side surfaces face outward, and a plurality of LED chips 4 positioned on the substrate 2 as a plurality of light emitting elements so as to surround the first reflector 3. At least both side surfaces of the first reflector 3 have a light reflecting function. Thereby, a light source device is obtained, which has an enhanced light distribution characteristic with sufficiently homogeneous diffused light and can be readily manufactured with a simple configuration.

Abstract: A light-emitting device capable of ensuring an electric connection between a light-emitting element and an electrode without generating any problem in practical use, by both connecting methods with a solder and a connector, and a lighting device provided with the light-emitting device are provided. The light-emitting device according to the present invention has a plurality of LED chips, and a soldering electrode land and a connector connecting electrode land electrically connected to the chips, on a ceramic substrate. The soldering electrode land is formed of a first conductive material having a function to prevent diffusion to a solder, and the connector connecting electrode land is formed of a second conductive material having a function to prevent oxidation.

Abstract: A light emitting device includes: a ceramic substrate; a plurality of LED chips; a printed resistor(s) connected in parallel with the plurality of LED chips; a dam resin made of a resin having a low optical transmittance; a fluorescent-material-containing resin layer; and an anode-side electrode and a cathode-side electrode, (a) which are provided on a primary surface of the ceramic substrate so as to face each other along a first direction on the primary surface and (b) which are disposed below at least one of the dam resin and the fluorescent-material-containing resin layer. With the configuration in which a plurality of LEDs, which are connected in a series-parallel connection, are provided on a substrate, it is possible to provide a light emitting device which can achieve restraining of luminance unevenness and an improvement in luminous efficiency.

Abstract: A substrate-type LED light source (10) includes: at least one blue LED chip (2) which has an emission peak in a range from 400 nm to 480 nm so as to correspond to a blue light region absorption peak of chlorophyll; a red phosphor (7b) which emit, upon receiving excitation light from the at least one blue LED chip (2), light having a peak wavelength in a range from 620 nm to 700 nm so as to correspond to a red light region absorption peak of chlorophyll; and a resin layer (7) in which the red phosphor 7b is dispersed and which covers the at least one blue LED chip (2).

Abstract: The color purities of blue-green light and yellow or yellow-green light are enhanced. A light emitting device (100) configured to emit at least blue-green light and yellow or yellow-green light includes a substrate (51), an LED chip group, and a sealing resin part (50) collectively sealing the LED chip group, wherein the LED chip group at least includes a green LED chip (GB), a green LED chip (GY), a blue LED chip (B), and a red LED chip (R), and the green LED chip (GB) has a dominant wavelength shorter than a dominant wavelength of the green LED chip (GY).

Abstract: A light-emitting device capable of ensuring an electric connection between a light-emitting element and an electrode without generating any problem in practical use, by both connecting methods with a solder and a connector, and a lighting device provided with the light-emitting device are provided. The light-emitting device according to the present invention has a plurality of LED chips, and a soldering electrode land and a connector connecting electrode land electrically connected to the chips, on a ceramic substrate. The soldering electrode land is formed of a first conductive material having a function to prevent diffusion to a solder, and the connector connecting electrode land is formed of a second conductive material having a function to prevent oxidation.