Patent ID: 11929378
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A light detection device comprising:
a light receiving element unit including a plurality of back-illuminated light receiving elements respectively including a plurality of light receiving portions;
a circuit element;
a connection member disposed between the light receiving element unit and the circuit element and configured to electrically and physically connect the light receiving element unit and the circuit element to each other;
an underfill disposed between the light receiving element unit and the circuit element; and
a frame-shaped light shielding mask disposed on the circuit element to surround the light receiving element unit when viewed from a light incident direction to the light receiving element unit,
wherein the light shielding mask includes a frame having an opening in which the light receiving element unit is located,
wherein a first opening edge on the side of the circuit element in the opening is located at the outside of an outer edge of the light receiving element unit when viewed from the light incident direction,
wherein a second opening edge opposite to the circuit element in the opening is located at the inside of the outer edge of the light receiving element unit when viewed from the light incident direction,
wherein the opening is narrowed from the first opening edge toward the second opening edge,
wherein a width of the frame increases from the first opening edge toward the second opening edge, and
wherein the underfill reaches a gap between the light receiving element unit and an inner surface of the opening of the light shielding mask.