Citizen Watch Company, Ltd.

Citizen Electronics Co., Ltd.

Takashi Watanabe

Kiyokazu Watanabe

Naoya Kashiwagi

Takuma Horiuchi

Junji Miyashita

Toshinobu Katsumata

Takumi Miyashita

Kazuya Ishihara

Yoshihiro Sho

Tomoo Udagawa

Kazuhiro Uwajima

A planar light-emitting device having a linear light-emitter having a substrate extending in a predetermined direction, a first line and a second line including a plurality of light-emitting elements arranged along the predetermined direction on the substrate, the first line and the second line being arranged side by site along the predetermined direction with an interval, a first frame arranged on the substrate so as to surround the first line, a second frame arranged on the substrate so as to surround the second line, a first seal arranged inside the first frame for sealing the plurality of light-emitting elements, a second seal arranged inside the second frame for sealing the plurality of light-emitting elements, and a plurality of electrodes arranged on the substrate and electrically connected with the plurality of light-emitting elements, and a light guide plate having an incidence surface having a first flat portion facing to the first line, a second flat portion facing to the second line, a projecting portion arranged between the first flat portion and the second flat portion and projecting toward the linear light-emitter, and an emission surface emitting light incident from the incidence surface, wherein the projecting portion has a first light-incoming surface arranged at an angle so as to face to an end portion of the first frame on the second frame side, and a second light-incoming surface arranged at an angle so as to face to an end portion of the second frame on the first frame side.

Planar 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.

Backlight

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.

Side edge planar lighting unit

Growing community of inventors

Fujiyoshida, Japan

Takashi Watanabe