Carbon dioxide sensor

• US 9,958,381 B2
• Filed: 04/03/2017
• Issued: 05/01/2018
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Sakai, Koji, Matsuo, Naoya, Hoshino, Narutoshi, Shimomura, Tsutomu
• Primary Examiner(s): Jo, Taeho
• Application Number:
  US15/477,689
• Publication Number:
  US 20170205340A1
• Time in Patent Office: 393 Days
• Field of Search: 2503381
• CPC Class Codes: G01N 21/0303 Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment G01N21/031 - G01N21/15 take precedence
• CPC Class Codes: G01N 21/05 Flow-through cuvettes G01N21/09 takes precedence; handling fluid samples G01N1/10
• CPC Class Codes: G01N 21/35 using infrared light G01N21/39 takes precedence
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/552 Attenuated total reflection

Abstract

A device includes a light emitting element, a light receiving element, an electronic part capable of processing a signal output from the light receiving element, an optical member covering the light emitting element and the light receiving element, and a board on which the light emitting element, the light receiving element, the electronic part, and the optical member are mounted. The board includes conductor wiring electrically connected to the light receiving element.

Claims

1. A carbon dioxide sensor comprising:

a light emitting element;

a light receiving element;

a circuit which receives a signal output from the light receiving element;

an optical member covering the light emitting element and the light receiving element; and

a board having a first board surface and a second board surface, the light emitting element, the light receiving element, and the optical member being mounted on the first board surface,

wherein the optical member includes a first end side, and a second end side on a side opposite to the first end side in a plan view viewed from a first board surface side,

wherein each of the light emitting element and the light receiving element is disposed at a position closer to the first end side than the circuit,

wherein the optical member includes a first region which is in front of the light emitting element and a second region which is in front of the light receiving element,

wherein the optical member includes a wall portion disposed between the first region and the second region, and the wall portion has a first side surface in the first region and a second side surface in the second region, and

wherein the first side surface and the second side surface are not parallel in the plan view viewed from a first board surface side.

2. The carbon dioxide sensor according to claim 1, wherein the optical member includes a reflection mirror disposed at the second end side, and the reflection mirror is flat.

3. The carbon dioxide sensor according to claim 1, wherein the optical member has a side surface having curvature in the second region in the plan view.

4. The carbon dioxide sensor according to claim 1, wherein the optical member includes three engaging holes, and

one of the engaging hole is located at the second end side, two of engaging holes are located at the first end side.

5. The carbon dioxide sensor according to claim 1, wherein the optical member has two air holes.

6. The carbon dioxide sensor according to claim 1, wherein the optical member has a third side surface in the first region and fourth side surface in the second region,

wherein the first side surface of the wall portion and third side surface face each other, and the second side surface of the wall portion and fourth side surface face each other, and

a distance between the first side surface and the closest position of the third side surface is longer than a distance between the second side surface and the closest position of the fourth side surface.

7. The carbon dioxide sensor according to claim 1, wherein the board has a first surface and a second surface, and

the light emitting element and the light receiving element are mounted on the first surface, and the circuit is mounted on the second surface.

8. The carbon dioxide sensor according to claim 1, wherein the board has a conductor wiring placed at the second end side.

9. The carbon dioxide sensor according to claim 1, further comprising a support body disposed between the board and the optical member,

wherein the support body is formed of a synthetic resin.

10. The carbon dioxide sensor according to claim 1, wherein the board includes two insertion holes to connect with the optical member located at the first end side,

wherein a distance between two of the insertion holes is longer than a distance between the light emitting element and the light receiving element.

11. A carbon dioxide sensor comprising:

a light emitting element;

a light receiving element;

a circuit which receives a signal output from the light receiving element;

an optical member covering the light emitting element and the light receiving element; and

a board having a first board surface and a second board surface, the light emitting element, the light receiving element, and the optical member being mounted on the first board surface,

wherein the optical member includes a first end side, and a second end side on a side opposite to the first end side in a plan view viewed from a first board surface side,

wherein the optical member defines a first optical path that guides an infrared light emitted from the light emitting element toward the second end side, a second optical path that bends and guides the infrared light from the first optical path toward the first end side, and a third optical path that guides the infrared light guided from the second optical path toward the light receiving element, and the optical member has a wall portion between the first optical path and the second optical path.

12. The carbon dioxide sensor according to claim 11, wherein a width of the third optical path is widened from the second end side to the first end side.

13. The carbon dioxide sensor according to claim 11, wherein the optical member includes a reflection mirror disposed in the third optical path, and

the reflection mirror is flat.

14. The carbon dioxide sensor according to claim 11, wherein the optical member includes three engaging holes, and

one of the engaging hole is located at the second end side, two of engaging holes are located at the first end side.

15. The carbon dioxide sensor according to claim 11, wherein the optical member has two air holes.

16. The carbon dioxide sensor according to claim 11, wherein the board has a first surface and a second surface, and

the light emitting element and the light receiving element are mounted on the first surface, and the circuit is mounted on the second surface.

17. The carbon dioxide sensor according to claim 11, wherein the board has a conductor wiring placed at the second end side.

18. The carbon dioxide sensor according to claim 11, further comprising a support body disposed between the board and the optical member,

wherein the support body is formed of a synthetic resin.

19. The carbon dioxide sensor according to claim 11, wherein the board includes two insertion holes to connect with the optical member located at the first end side,

wherein a distance between two of the insertion holes is longer than a distance between the light emitting element and the light receiving element.