Citizen Watch Company, Ltd.

Citizen Electronics Co., Ltd.

Nichia Corporation

Takuma Horiuchi

Kiyokazu Watanabe

Takumi Miyashita

Toshinobu Katsumata

Naoya Kashiwagi

Takashi Watanabe

Junji Miyashita

Ryo Tamura

Yoshihiro Sho

Tomoo Udagawa

Takahiro Shimizu

Kazuhiro Uwajima

Ryo Matsuura

A linear light-emitting device including a substrate extending while being curved in a predetermined direction, a plurality of light-emitting elements arranged on the substrate in a predetermined direction, and a seal for sealing the plurality of light-emitting elements, wherein a luminance of a specific part of the substrate is higher than that of the other parts of the substrate.

Linear light-emitting device

The backlight device has a substrate, a plurality of light emitting elements disposed on a surface of the substrate, a diffuser plate having an incident surface disposed facing to the surface of the substrate, and an emitting surface disposed on the opposite side of the incident surface, diffuses light incident on the incident surface from the plurality of light emitting elements, and emits the diffused light from the emitting surface, and a frame defining a light emitting region on which the plurality of light emitting elements are disposed, wherein the frame is disposed so as not to form a region less than the half value outside the light emitting elements disposed along the frame, and all of the plurality of light emitting elements are disposed so that a ratio less than the half value is 20% or less, the ratio less than the half value is a ratio of an area of the region less than the half value to an area of a surrounding region formed by connecting at least three light emitting elements disposed around the region less than the half value, and the region less than the half value is a region on which no half value regions of the plurality of light emitting elements are disposed.

Backlight device

To provide a backlight that reduces the number of LEDs used while facilitating the attempt to make the backlight smaller in thickness. On a mount substrate (), LEDs () are mounted in a square lattice arrangement. Over a portion near the center of each unit of the square lattice, protrusions () of a diffusion plate () are disposed. Among light emitted from the LEDs (), light traveling in lateral directions between the mount substrate () and the diffusion plate () is captured by the protrusions (). The captured light is refracted and reflected by the interfaces of the protrusions (), and diffused due to diffusing particles, with the result that the light is turned into upward illumination light.

Backlight

To provide a backlight that reduces the number of LEDs used while facilitating the attempt to make the backlight smaller in thickness. On amount substrate (), LEDs () are mounted in a square lattice arrangement. Over a portion near the center of each unit of the square lattice, protrusions () of a diffusion plate () are disposed. Among light emitted from the LEDs (), light traveling in lateral directions between the mount substrate () and the diffusion plate () is captured by the protrusions (). The captured light is refracted and reflected by the interfaces of the protrusions (), and diffused due to diffusing particles, with the result that the light is turned into upward illumination light.

A light-emitting device comprises a first optical element covering an LED and covered by a second optical element. The first optical element has: a first incident surface on which light emitted from the LED is incident; a recessed first reflecting surface, above the first incident surface, and reflecting to the side the light is incident via the first incident surface from the LED; and a first emitting surface across the periphery of the first reflecting surface, which emits the light from the first reflecting surface. The second optical element has: an incident-reflecting surface formed by, concentric second incident surfaces on which light emitted from the first emitting surface is incident, and second reflecting surfaces alternately with the second incident surfaces, that reflect upward the light incident on the second incident surfaces; and a second emitting surface above the incident-reflecting surface, that emit light reflected by the second light reflecting surfaces.

Light-emitting device

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.

A side edge planar lighting unit includes a light emitting diode, a light guide plate, and a transparent flexible resin between the light emitting diode and the light guide plate. The light emitting diode and the light guide plate are brought into close contact by the transparent flexible resin. The light guide plate includes a light exit face on a first main surface, a reflective face on a side opposite the light exit face, and a recessed portion in a first side edge. The recessed portion includes the light entrance face on a bottom surface, a pair of light entrance side faces facing each other across the light entrance face, and an anti-slip portion made of an uneven structure on at least one of the light entrance side faces. The transparent flexible resin is fitted in the recessed portion of the light guide plate.

Growing community of inventors

Yamanashi-ken, Japan

Takuma Horiuchi