PNPN thyristor
AssigneeNEC Corporation
InventorKenichi Kasahara
Life of this patent
Estimating the term…
Abstract
A pnpn thyristor comprises an anode and cathode region, and a base region which is positioned between the anode and cathode regions. The base region is composed of a p-base layer facing the cathode region, and a first to third n-base layers. Among the first to third n-base layers, the first n-base layer faces the p-base layer, and the third n-base layer faces the anode region. The anode and cathode regions are wider in their forbidden bandwidth than the first and third n-base layers, and the second n-base layer is narrower in its forbidden bandwidth than the first and third n-base layers so that an optical coupling property is improved, and a high output of light is obtained.
Claims10
A pnpn thyristor comprising,
- anode and cathode regions, and
- a base region which is positioned between said anode and cathode regions,
- said base region including a p-base layer facing said cathode region, and first to third n-base layers among which said first n-base layer faces said p-base layer, and said third n-base layer faces said anode region,
- wherein respective forbidden bandwidths of said anode and cathode regions are wider than those of said first and third n-base layers, and a forbidden bandwidth of said second n-base layer is narrower than those of said first and third n-base layers.
A pnpn thyristor comprising,
- a pnpn thyristor element comprising anode and cathode regions, and a base region which is positioned between said anode and cathode regions, said base region including a p-base layer facing said cathode region, and first to third n-base layers among which said first n-base layer faces said p-base layer, and said third n-base layer faces said anode region, wherein respective forbidden bandwidths of said anode and cathode regions are wider than those of said first and third n-base layers, and a forbidden bandwidth of second n-base layer is narrower than those of said first and third n-base layers.
- a mirror having a predetermined reflecting angle which is positioned near a resonance plane of said pnpn thyristor element, and
- a plate member having a window for passing trigger light on which said pnpn thyristor element and said mirror are provided.
Dependencies are inferred from the claim text.