Abstract: Provided are a switch module and a push switch that have a soft sensation when pressed. A push switch and a switch module have a substrate, a first fixed contact point disposed on the substrate surface, a second fixed contact point disposed around the first fixed contact point on the substrate surface, a convex dome-shaped upper spring disposed on the substrate surface so that an end part is in contact with the second fixed contact point, the upper spring being pressed so as to invert the dome shape and to establish conduction between the first fixed contact point and the second fixed contact point, and a lower spring disposed below the upper spring, the lower spring adjusting the operation load applied to the upper spring during inversion of the dome shape.

Abstract: An LED light-emitting element having reduced the occurrence of illuminance unevenness is provided. A light-emitting element comprising a substrate, an LED element mounted on the substrate, a phosphor resin arranged on the substrate so as to seal the LED element and having an emission surface from which light based on light emitted from the LED element is emitted, a reflective resin arranged around the phosphor resin; and a reflecting frame having an opening and at least part of which is arranged on the reflective resin, wherein the reflective resin is arranged directly under the reflecting frame and on the side surface of the phosphor resin, the ratio of the area of the emission surface to the area of an inside area of the reflecting frame is set to 80% or higher, and in the inside area of the reflecting frame, the reflective resin is exposed around the emission surface.

Abstract: The purpose of the present invention is to provide an LED driving circuit with which it is possible to easily manage the color temperature by adjusting light.

Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

Abstract: A planar light unit is provided that suppresses appearance of a bright line when viewed from the side of the emission surface of the light guide plate. The planar light unit includes a light source, and a light guide plate including an incident surface for receiving light emitted from the light source, an emission surface from which the light introduced through the incident surface is emitted, an opposing surface disposed so as to oppose the emission surface, and a side surface disposed along an outer periphery of the emission surface and the opposing surface. The emission surface has a non-rectangular outer shape, and at least a part of the side surface is formed as a diffusing surface.

Abstract: There is provided a backlight capable of easily eliminating a bright portion generated near lateral surfaces of a light guide plate, even when a plate-like reflective member is brought close to the lateral, surfaces of the light guide plate. The backlight includes, a light guide plate including a light emission surface, a reflective surface, and at least one of the lateral surface as an incident surface, a light source disposed to face the incident surface, a reflective member which is disposed to face another lateral surface other than the incident surface and includes a diffusion reflective surface, and an adhesive member for adhering the reflective member to the another lateral surface of the light guide plate, wherein a length of the adhesive member in a thickness direction of the light guide plate is smaller than a thickness of the light guide plate.

Abstract: Provided is an LED drive circuit whereby the light emission color is easily changed when dimming by adjusting the current that drives the LED. The LED drive circuit has: a variable constant current source; a first LED row having a plurality of LEDs connected in series and emitting light in a first light emission color; a second LED row having a plurality of LEDs connected in series and emitting light in a second light emission color; and a current limiting circuit including a current detection element and a switch element. The LED drive circuit is characterized by: the threshold voltage for the first LED row being larger than the threshold voltage for the second LED row; the first LED row and the second LED row being connected in parallel to the variable constant current source; and the current limiting circuit limiting the current flowing to the second LED row, on the basis of the current flowing to the current detection element via the first LED row.

Abstract: A light emitting device includes a light emitting element including electrodes on its under face, a phosphor cover attached to the light emitting element so as to cover a top face and a side face of the light emitting element, and a reflection frame including a side face holding periphery of the phosphor cover and a tilted face tilting from the side face to the outside and upward.

Abstract: Provided is a light-emitting module that achieves high brightness, whose electrode structure is simple and whose brightness distribution has rotational symmetry. The light-emitting module includes a substrate, a first electrode and a second electrode disposed on the substrate, LED devices connected between the first electrode and the second electrode, a dam member disposed on the substrate so as to surround the LED devices, and a phosphor-containing resin for sealing the LED devices by being filled into a region surrounded by the dam member on the substrate. The first electrode includes a first outer electrode disposed under the dam member and a first inner electrode disposed nearer to a center of the substrate than the first outer electrode is. The second electrode includes a second outer electrode disposed under the dam member and a second inner electrode disposed nearer to the center of the substrate than the second outer electrode is.

Abstract: An object of the present invention is to provide a light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors, and to provide a light-emitting device that can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations, and a method for designing thereof. Another object of the present invention is to improve the appearance of colors of a light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good. Moreover, another object of the present invention is to provide a method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device.

Abstract: A light-emitting device includes a substrate, and a plurality of light-emitting arrays or light-emitting groups arranged on the substrate. The light-emitting arrays or light-emitting groups include a plurality of LED elements connected in parallel with a pair of adjacent electrodes. The number of the LED elements constituting each of the light-emitting arrays or the light-emitting groups differs in each of the light-emitting arrays or the light-emitting groups. Of the plurality of light-emitting arrays arranged in parallel with each other or the light-emitting groups arranged in a line, the number of the LED elements of the light-emitting arrays or the light-emitting groups positioned inside the substrate is more than the number of the LED elements of the light-emitting arrays or the light-emitting groups positioned outside the substrate.

Abstract: Phosphors include a CaAlSiN3 family crystal phase, wherein the CaAlSiN3 family crystal phase comprises at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb.

Abstract: An LED module according to the present invention includes: a mounting substrate; a first LED group including a plurality of LEDs mounted in a first light-emitting area extending in a first direction on the mounting substrate; a second LED group including a plurality of LEDs mounted in a second light-emitting area located outside the first light-emitting area; a dam material surrounding a periphery of the second light-emitting area; a first fluorescent resin coating the first LED group and causing the first light-emitting area to emit light having a first color temperature; and a second fluorescent resin coating at least the second LED group and causing the second light-emitting area to emit light having a second color temperature higher than the first color temperature, and viscosity of the first fluorescent resin is higher than viscosity of the second fluorescent resin.

Abstract: To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.

Abstract: To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.

Abstract: Provided is a light emitting apparatus that causes no lateral light leakage, enables easy assembly, and allows free selection of the shape of a reflection frame. The light emitting apparatus includes an LED device which is flip-chip mounted on a substrate, a phosphor layer placed on a light emitting surface of the LED device, a reflective resin having a recessed portion formed on the upper surface thereof, the reflective resin covering the side surface of the LED device and the side surface of the phosphor layer, and a reflection frame having a protruded portion formed on the lower surface thereof, the reflection frame being fixed on or above the phosphor layer and the reflective resin by engaging the protruded portion with the recessed portion of the reflective resin.

Abstract: In a first aspect of the present inventive subject matter, a light-emitting device includes a magnetic circuit including a magnetic gap; a movable member including a coil that is electrically connectable to an alternating current power source and arranged in the magnetic gap of the magnetic circuit; and a light source including a light-emitting diode and arranged above the movable member, and the movable member is able to be activated with a voltage falling in a range of one to five percent of an entire voltage range that is applicable to the light-emitting device.

Abstract: To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.