Light detection device

Patent metadata

Field	Value
Publication number	US-12169143-B2
Application number	US-202318223209-A
Country	US
Kind code	B2
Filing date	Jul 18, 2023
Priority date	Oct 9, 2019
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

A light detection device of the present invention includes: a wiring board; a first support part disposed on a mounting surface of the wiring board; a Fabry-Perot interference filter having a first mirror part and a second mirror part between which a distance is variable and having an outer edge portion disposed in a first support region of the first support part; a light detector disposed on the mounting surface to face the first mirror part and the second mirror part on one side of the first support part; and a temperature detector disposed on the mounting surface, wherein the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface and such that at least a part of the temperature detector overlaps a part of the first support part when seen in a second direction in which the first support part and the light detector are aligned with each other, and wherein a first distance between the temperature detector and the first support part in the second direction is smaller than a first width of the first support region in the second direction.

First claim

The invention claimed is:

1. A light detection device comprising:
a wiring board including a first wiring;
a first support part disposed on a mounting surface of the wiring board;
a Fabry-Perot interference filter disposed on the first support part, and having a first mirror part and a second mirror part between which a distance is variable; and
a light detector disposed on the mounting surface to face the first mirror part and the second mirror part on one side of the first support part, wherein
the first wiring includes:
a first mounting portion provided on the mounting surface, and electrically connected to the light detector,
a first electrode pad provided on the mounting surface, and
a first connecting portion provided on the mounting surface, and connecting the first mounting portion and the first electrode pad, wherein
at least a portion of the first wiring on a side of the first electrode pad is disposed outside the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface.

2. The light detection device according to claim 1 , wherein a distance between the first electrode pad and the light detector, in a third direction perpendicular to both the first direction and a second direction in which the first support part and the light detector are aligned with each other, is greater than a distance between the first support part and the light detector in the second direction.

3. The light detection device according to claim 1 ,
wherein the outer edge portion of the Fabry-Perot interference filter is disposed in a support region of the first support part, and
wherein the distance between the first support part and the light detector in a second direction, in which the first support part and the light detector are aligned with each other, is smaller than a width of the support region in the second direction.

4. The light detection device according to claim 1 , further comprising:
a placement part on which the wiring board is disposed;
a first terminal provided in the placement part; and
a wire electrically connecting the first electrode pad and the first terminal.

5. The light detection device according to claim 1 , further comprising:
a temperature detector disposed on the mounting surface, wherein
the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in the first direction and such that at least a part of the temperature detector overlaps a part of the first support part when seen in the second direction in which the first support part and the light detector are aligned with each other, and
the wiring board further includes a second wiring, wherein
the second wiring includes:
a second mounting portion provided on the mounting surface, and electrically connected to the temperature detector,
a second electrode pad provided on the mounting surface, and
a second connecting portion provided on the mounting surface, and connecting the second mounting portion and the second electrode pad, wherein
at least a portion of the second wiring on a side of the second electrode pad is disposed outside the Fabry-Perot interference filter when seen in the first direction.

6. The light detection device according to claim 1 , further comprising:
a second support part disposed on the mounting surface to face the first support part with the light detector interposed therebetween in the second direction in which the first support part and the light detector are aligned with each other, wherein
the Fabry-Perot interference filter is disposed on the second support part, and
in a space which is located between the wiring board and the Fabry-Perot interference filter in the first direction and is located between the first support part and the second support part in the second direction, a value obtained by dividing a width of the space in the third direction perpendicular to both the first direction and the second direction by a width of the space in the second direction is 1.5 or more.

7. The light detection device according to claim 1 , wherein the Fabry-Perot interference filter includes a second terminal, wherein the second terminal is located in a region of the first support part on a side of the light detector when seen in the first direction.

Assignees

• Hamamatsu Photonics Kk

Inventors

• Kasahara Takashi
• Shibayama Katsumi
• Tabata Kei
• Hirose Masaki
• Oyama Hiroki
• Kuramoto Yumi

Classifications

• G02B26/001 Primary

  based on interference in an adjustable optical cavity (interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26) · CPC title

• G02B5/281

  designed for the infrared light · CPC title

• G01J3/45

  Interferometric spectrometry · CPC title

• G01J3/0297

  Constructional arrangements for removing other types of optical noise or for performing calibration · CPC title

• G02F1/213

  Fabry-Perot type · CPC title