Nichia Corporation

Daisuke Kasai

Toru Hashimoto

Takuya Nakabayashi

Tadao Hayashi

Shinichi Daikoku

Takao Nakauchi

Akira Miki

A light-emitting module includes: a plurality of light sources; and a lightguide plate including a plurality of light source placement sections, in each of which at least one light source is arranged, arrayed in a first direction and a second direction orthogonal to the first direction. The lightguide plate defines at least one first-A light control groove and at least one first-B light control groove that extend parallel to the second direction between a first light source placement section and a second light source placement section adjacent to the first light source placement section in the first direction, and at least one second-A light control groove and at least one second-B light control groove that extend parallel to the first direction between the first light source placement section and a third light source placement section adjacent to the first light source placement section in the second direction.

Light-emitting module

A method of manufacturing a planar light source includes: providing a wiring substrate; locating a light guide plate on a first principal face of the wiring substrate, wherein the light guide plate includes a plurality of unit regions arranged in one dimension or two dimensions, and a plurality of through holes that are open at the a principal face and a second principal face of the light guide plate, wherein at least one of the through holes is located in the unit regions; locating light sources in the through holes in the unit regions on the first principal face of the wiring substrate; locating a first light transmissive member in a first of the through holes; and locating a second light transmissive member in the first through hole.

Planar light source and method of manufacturing planar light source

In order to obtain a light emitting module with a less unevenness of luminance, provided is a method for manufacturing a light emitting module comprising: preparing a light emitter and a light-transmissive light guide plate, the light emitter comprising a light emitting element, the light guide plate having a first main surface serving as a light emitting surface from which light is emitted outside and a second main surface located opposite to the first main surface and having a concave portion, the concave portion comprising a side surface and a bottom surface that is smaller than an opening of the concave portion in a cross-sectional view; fixing the light emitter to the bottom surface of the concave portion via a bonding member; and forming a wiring at an electrode of the light emitting element.

Light emitting module with concave surface light guide plate

A light-emitting module includes: a lightguide plate having a main surface and including a plurality of unit regions including at least one first unit region and a plurality of second unit regions, the lightguide plate including a plurality of first recesses in the main surface; a plurality of light sources provided at the main surface, each of the light sources being located in the first recess so as to correspond to one of the unit regions; and a light-transmitting member provided in the first recess of each of the unit regions. In the second unit regions, an optical axis of the light sources is coincident with a center of the first recess. In the first unit region, the optical axis of the light source is offset from the center of the first recess, and an upper surface of the light-transmitting member has a first receding part.

A planar light source includes: a light guide plate including: a first principal face, a second principal face located opposite the first principal face, and a plurality of through holes that are open at the first principal face and the second principal face; a plurality of light sources, wherein at least one of the light sources is located in the through holes of the light guide plate; a wiring substrate on which the plurality of light sources are located; a first light transmissive member located in a first of the through holes so as to cover at least a portion of a lateral face of the at least one light source located in the first through hole; and a second light transmissive member located in the first through hole so as to cover at least an upper face of the first light transmissive member.

A light-emitting module includes a light-emitting element unit including a light-emitting element, a light-transmissive member covering a main light-emitting surface of the light-emitting element, and a first light-reflective member covering lateral surfaces of the light-emitting element; a light-transmissive light-guiding plate having a first main surface and a second main surface having a recess accommodating the light-emitting element unit; a second light-reflective member covering the second main surface and the light-emitting element unit; and a light-transmissive bonding member disposed in contact with inner lateral surfaces of the recess and outer lateral surfaces of the light-emitting element unit. At least a portion of the first light-reflective member is located outside the recess in a cross-sectional view, and is in contact with the light-transmissive bonding member. The light-transmissive bonding member has an inclined surface forming an acute angle with a corresponding outer lateral surface of the first light-reflective member.

A light-emitting module includes a light-transmitting plate member having a first main surface and an opposite second main surface light-transmitting plate member including a plurality of light sources provided on the first surface; and a plurality of lens structures provided in the second surface and corresponding to each of the light sources, such that an optical axis of some of the lens structures coincident with the optical axis of a corresponding one of the light sources, and, an optical axis of some of the lens structures is offset from an optical axis of a corresponding one of the light sources.

Light-emitting module having array of light sources, some aligned and others offset with array of lense structures

A light emitting module includes: a light emitting element unit including: a light-emitting element that has a main-light-emission surface, an electrode-formation surface and a side-surface, a light-transmissive member that covers the main-light-emission surface, and a first light-reflection member that covers the side-surface; a light-transmissive light guide plate including a first main-surface as a light emission surface, and a second main-surface opposed to the first main-surface and has a recess accommodating the light emitting element unit so that the first light-reflection member is partially arranged out of the recess in a cross-section; a light-transmissive interposition member that contacts an interior side-surface of the recess and an exterior side-surface of the light emitting element unit; and a second light-reflection member that partially covers the second main-surface and the interposition member. The interposition member is at least partially exposed from the second light-reflection member in a plan view. The hardness of the interposition member is lower than a hardness of the first light-reflection member and a hardness of the second light-reflection member.

Light emitting module

Method for manufacturing light emitting module with concave surface light guide plate

A light-emitting module includes: a lightguide plate including a first primary surface, a second primary surface opposite to the first primary surface, and unit regions arranged in a one-dimensional or two-dimensional array, and defining first recesses in the first primary surface, each of the first recesses located in a respective one of the unit regions; light sources disposed at the first primary surface of the lightguide plate and each disposed in the first recess of a corresponding one of the unit regions; and a plurality of light-transmissive members each disposed in the first recess in a respective one of the unit regions so as to cover at least a portion of each lateral surface of its corresponding light source. The unit regions include at least one first unit region, in which an upper surface of the light-transmissive member forms a first depression extending toward a bottom of the first recess.

A method for manufacturing a light emitting device includes: preparing an LED die having a laminated structure including a light emitting surface, an electrode forming surface, and a side surface, and at least one electrode placed on the electrode forming surface; preparing a wavelength conversion member having an upper surface defining a recess, the recess having an opening diameter greater than a diameter of the light emitting surface in a plan view; placing a light-transmissive member within the recess; mounting the LED die on an upper surface of the light-transmissive member white the light emitting surface faces the upper surface of the light-transmissive member and pressing the LED die so that at least a portion of the light-transmissive member is placed on the side surface of the laminated structure; and placing a light reflecting member to cover the LED die, the light-transmissive member, and the wavelength conversion member.

Growing community of inventors

Tokushima, Japan

Daisuke Kasai