BIOLOGICAL SENSOR AND METHOD FOR MANUFACTURING BIOLOGICAL SENSOR

• US 20150190079A1
• Filed: 03/24/2015
• Published: 07/09/2015
• Est. Priority Date: 09/24/2012
• Status: Abandoned Application

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Tsuchimoto, Hirofumi, Yamaji, Kazuhiro
• Application Number:
  US14/666,747
• Publication Number:
  US 20150190079A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/12 Manufacturing methods specially adapted for producing sensors for in-vivo measurements
• CPC Class Codes: A61B 2562/166 the sensor is mounted on a specially adapted printed circuit board
• CPC Class Codes: A61B 2562/185 Optical shielding, e.g. baffles
• CPC Class Codes: A61B 5/02433 for infrared radiation
• CPC Class Codes: A61B 5/02444 Details of sensor A61B5/02427 takes precedence
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 2201/09036 Recesses or grooves in insulating substrate
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: H05K 3/303 Surface mounted components, e.g. affixing before soldering, aligning means, spacing means H05K3/32 takes precedence
• CPC Class Codes: Y10T 29/49146 with encapsulating, e.g., potting, etc.

Abstract

Provided is a biological sensor capable of reducing stray light that is received without passing through a biological body without increasing the size of the sensor, and capable of improving the reliability of the sensor.

A biological sensor includes a circuit board, a light-emitting element and a light-receiving element mounted on a main surface of the circuit board with a predetermined interval therebetween, a light-transmissive light-emitting element sealing portion formed only on an upper portion of a mounting region of the light-emitting element, a light-transmissive light-receiving element sealing portion formed only on an upper portion of a mounting region of the light-receiving element, and a light-blocking portion formed on the main surface of the circuit board and provided in respective peripheries of the light-emitting element sealing portion and the light-receiving element sealing portion and between the light-emitting element sealing portion and the light-receiving element sealing portion.

Claims

1. A biological sensor comprising:

a circuit board;

a light-emitting element disposed on a surface of the circuit board;

a light-receiving element disposed on the surface of the circuit board with a predetermined distance between the light-emitting element and the light-receiving element;

a first light-transmissive sealing member disposed on a mounting region of the light-emitting element;

a second light-transmissive sealing member disposed on a mounting region of the light-receiving element; and

a light-blocking element disposed on the surface of the circuit board between the first and second light-transmissive sealing members.

2. The biological sensor according to claim 1, wherein the light-blocking element is disposed in respective peripheries of the first and second light-transmissive sealing members.

3. The biological sensor according to claim 1, wherein the first and second light-transmissive sealing members are disposed only on the mounting regions of the light-emitting element and the light-receiving element, respectively.

4. The biological sensor according to claim 1, wherein the light-blocking element and the first and second light-transmissive sealing members collectively form a top surface of the biological sensor and are flush with each other.

5. The biological sensor according to claim 1, wherein the first and second light-emitting sealing members project from the surface of the circuit board in a convex shape beyond the light-blocking element.

6. The biological sensor according to claim 1, wherein the surface of the circuit board comprises grooves disposed in peripheries of the light-emitting element and the light-receiving element.

7. The biological sensor according to claim 6, further comprising a pair of sub-boards disposed between respective grooves of the surface of the circuit board wherein the light-emitting element and the light-receiving element are mounted on the circuit board via the pair of sub-boards, respectively.

8. The biological sensor according to claim 1, wherein the light-emitting element and the light-receiving element are surface-mounted chips.

9. The biological sensor according to claim 1, wherein the light-emitting element and the light-receiving element are bare chip components.

10. The biological sensor according to claim 1, wherein the first and second light-emitting sealing members comprise a resin that is light-transmissive with respect to a wavelength of light emitted by the light-emitting element.

11. The biological sensor according to claim 1, wherein the circuit board comprises a rectangular shape and the light-emitting element and the light-receiving element are mounted in corner areas of the circuit board on a diagonal line between opposing corners of the circuit board.

12. A method for manufacturing a biological sensor comprising:

mounting a light-emitting element on a surface of a circuit board;

mounting a light-receiving element on the surface of the circuit board with a predetermined distance between the light-emitting element and the light-receiving element;

forming a first light-transmissive sealing member on a mounting region of the light-emitting element;

forming a second light-transmissive sealing member on a mounting region of the light-receiving element; and

forming a light-blocking element on the surface of the circuit board between the light-emitting element sealing portion and the light-receiving element sealing portion.

13. The method for manufacturing a biological sensor according to claim 12, wherein the forming of the light-blocking element comprises forming the light-blocking element in respective peripheries of the first and second light-transmissive sealing members.

14. The method for manufacturing a biological sensor according to claim 12, wherein the forming of the first and second light-transmissive sealing members comprises forming the first and second light-transmissive sealing members only on the mounting regions of the light-emitting element and the light-receiving element, respectively.

15. The method for manufacturing a biological sensor according to claim 12, further comprising:

removing a portion of each of the light-blocking element, the first light-transmissive sealing member, and the second light-transmissive sealing member to form a top surface of the biological sensor with the light-blocking element and the first and light-transmissive sealing members flush with each other.

16. The method for manufacturing a biological sensor according to claim 12, wherein the forming of the light-blocking element comprises forming the light-blocking element so that respective apex portions of the first and light-transmissive sealing members each project in a convex shape beyond a top surface of the light-blocking portion.

17. The method for manufacturing a biological sensor according to claim 12, further comprising forming grooves in the surface of the circuit board before mounting the light-emitting element and the light-receiving element on the surface of the circuit board.

18. The method for manufacturing a biological sensor according to claim 17, wherein the grooves are form in respective peripheries of the light-emitting element and the light-receiving element.

19. The method for manufacturing a biological sensor according to claim 12, further comprising mounting a pair of sub-boards to the surface of the circuit board and mounting the light-emitting element and the light-receiving element to the pair of sub-boards, respectively.

20. The method for manufacturing a biological sensor according to claim 12, wherein the forming of the light-blocking element comprises filling regions between the light-emitting element sealing portion and the light-receiving element sealing portion with an epoxy resin having a light-blocking powder.