Kabushiki Kaisha Toshiba

Tetsuya Muranaka

Yuichi Ikedo

Toshiaki Hosoya

Atsushi Takeshita

Iwao Matsumoto

Toshihiro Kuroki

Masaki Adachi

Yasunori Nagahata

Kenji Naito

An optical coupling device includes a light-emitting element, a light-receiving element that faces the light-emitting element, a lead frame that has a first surface on which the light-emitting element is provided and a second surface facing the first surface, a first covering material that covers the light-emitting element, a second covering material that covers the first covering material, the light-receiving element, and the lead frame, and a third covering material that covers the second covering material. At least one of first bonding strength between the second covering material and the third covering material and second bonding strength between the second covering material and the second surface is lower than third bonding strength between the first covering material and the second covering material.

Optical coupling device

A photocoupler includes: a light emitting element; a light receiving element; an inner resin layer; and an outer resin layer. The light emitting element is driven by an input electrical signal. The light receiving element is configured to convert emission light of the light emitting element into an electrical signal. The inner resin layer includes a base resin and a curing agent. The base resin contains isocyanuric acid having an epoxy group. The curing agent contains an acid anhydride having an acid anhydride group. The inner resin layer covers the light emitting element and the light receiving element. Then outer resin layer encloses the inner resin layer and configured to block the emission light. Carbon atomic concentration increases and oxygen atomic concentration decreases with distance in depth direction of the inner resin layer from an interface.

Photocoupler

According to one embodiment, a light emitting device includes a first lead, a light emitting element, a second lead and a molded body. The light emitting element is fixed on the first lead. The second lead is provided away from the first lead and electrically connected to the light emitting element via a metal wire. The, molded body made of a sealing resin covers the light emitting element, end portions of the first lead and the second lead, the light emitting element being fixed on the end portion of the first read, and the metal wire being bonded on the end portion of the second lead. The first groove is provided between first and second portions in a front surface of the second lead, the first portion being in contact with an outer edge of the molded body and the metal wire being bonded on the second portion.

Light emitting device

According to one embodiment, a light emitting device includes a first lead, a light emitting element, a second lead and a molded body. The first lead includes a die pad portion having a major surface and a recess provided in the major surface, a bent portion bent toward above the major surface, and a thermally conductive portion extending outward from the die pad portion. The first lead is provided with a slit at an end of a fold. The light emitting element is bonded to a bottom surface of the recess. The second lead with one end portion is opposed to one end portion of the first lead. The molded body covers the light emitting element, the bent portion, the die pad portion, the thermally conductive portion, and the one end portion of the second lead, penetrates through the slit, and is made of a resin.

According to one embodiment, a light emitting device includes a first lead, a light emitting element, a second lead and a molded body. The first lead includes a die pad portion having a major surface and a recess provided in the major surface, and a bent portion bent toward above the major surface. The light emitting element is bonded to a bottom surface of the recess. The second lead with one end portion is opposed to one end portion of the first lead. The molded body covers the light emitting element, the bent portion, the die pad portion, and the one end portion of the second lead, and is made of a resin. A position of barycenter of the molded body is set between a lower surface of the die pad portion and a plane including an upper end of the bent portion.

Light emitting device having a molded body with a specific barycenter

A light emitting device includes: a light emitting element;

Growing community of inventors

Fukuoka-ken, Japan

Tetsuya Muranaka