Optical sensor

• US 9,506,802 B2
• Filed: 01/26/2016
• Issued: 11/29/2016
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: Taiwan Biophotonic Corporation
• Original Assignee: Taiwan Biophotonic Corporation
• Inventors: Chu, Chang-Sheng, Li, Yu-Tang, Lee, Yeh-Wen, Fan, Chih-Hsun, Chung, Lung-Pin, Chen, Jyh-Chern, Chung, Shuang-Chao
• Primary Examiner(s): PYO, KEVIN K
• Application Number:
  US15/006,124
• Publication Number:
  US 20160238440A1
• Time in Patent Office: 308 Days
• Field of Search: 250/216, 250/221, 250/239, 257/82, 257/99
• US Class Current: 1/1
• CPC Class Codes: A61B 2560/0443 Modular apparatus
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/164 the sensor is mounted in or on a conformable substrate or carrier
• CPC Class Codes: A61B 2562/227 Sensors with electrical connectors
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: G01J 1/0209 Monolithic
• CPC Class Codes: G01J 1/0214 Constructional arrangements for removing stray light
• CPC Class Codes: G01J 1/0271 Housings; Attachments or accessories for photometers
• CPC Class Codes: G01J 1/029 Multi-channel photometry
• CPC Class Codes: G01J 1/0407 Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0437 using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 1/0459 using an optical amplifier of light or coatings to improve optical coupling
• CPC Class Codes: G01J 1/0488 with spectral filtering
• CPC Class Codes: G01J 1/08 Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
• CPC Class Codes: G01J 1/4228 arrangements with two or more detectors, e.g. for sensitivity compensation
• CPC Class Codes: G01J 1/44 Electric circuits for command of an exposure part G03B7/02
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 31/0203 : Containers; Encapsulations , e.g. encapsulation of photodiodesfor photovoltaic devices H01L31/048; for organic photosensitive devices H10K30/80
• CPC Class Codes: H01L 31/0232 : Optical elements or arrangements associated with the device H01L31/0236 takes precedence; for photovoltaic cells H01L31/054; for photovoltaic modules H02S40/20
• CPC Class Codes: H01L 31/02325 : the optical elements not being integrated nor being directly associated with the device
• CPC Class Codes: H01L 31/02327 : the optical elements being integrated or being directly associated to the device, e.g. back reflectors optical coatings H01L31/0216
• CPC Class Codes: H01L 31/125 : Composite devices with photosensitive elements and electroluminescent elements within one single body
• CPC Class Codes: H01L 31/173 : formed in, or on, a common substrate
• CPC Class Codes: H01L 33/54 : having a particular shape
• CPC Class Codes: H01L 33/58 : Optical field-shaping elements
• CPC Class Codes: H04B 10/071 : using a reflected signal, e.g. using optical time domain reflectometers [OTDR]

Abstract

The present disclosure relates to an optical sensor module, an optical sensing accessory, and an optical sensing device. An optical sensor module comprises a light source, a photodetector, and a substrate. The light source is configured to convert electric power into radiant energy and emit light to an object surface. The photodetector is configured to receive the light from an object surface and convert radiant energy into electrical current or voltage. An optical sensing accessory and an optical sensing device comprise the optical sensor module and other electronic modules to have further applications.

Claims

1. An optical sensor module comprising:

a substrate;

a light source disposed on the substrate;

a first encapsulant formed over the light source;

a photodetector disposed on the substrate;

a second encapsulant formed over the photodetector;

a partition coupled to the substrate and located between the light source and the photodetector; and

a microstructure formed on an outer profile of at least one of the first encapsulant and the second encapsulant;

wherein each of the first encapsulant and the second encapsulant has a top surface and a medial surface, the medial surface is between the substrate and the top surface and is substantially facing the partition, and the partition is spaced apart from the medial surface of the at least one of the first encapsulant and the second encapsulant by a predetermined distance.

2. The optical sensor module of claim 1, further comprising an optical directional component on the medial surface of the at least one of the first and the second encapsulants.

3. The optical sensor module of claim 2, wherein the optical directional component is configured as an inclined plane.

4. The optical sensor module of claim 2, wherein the optical directional component is configured as a curvature lens.

5. The optical sensor module of claim 1, wherein the photodetector is substantially annularly arranged around the light source.

6. The optical sensor module of claim 1, wherein the second encapsulant is substantially annularly arranged around the light source.

7. The optical sensor module of claim 1, further comprising a packaging wall and a cover, wherein the packaging wall is coupled to the substrate and defines an area surrounding the light source, the partition, and the photodetector;

the cover is disposed on the packaging wall and is configured for passing light through and keeping optical path clear.

8. The optical sensor module of claim 1, further comprising a cover, wherein the cover is arranged above both the first encapsulant and the second encapsulant, and the cover is configured for passing light through and keeping optical path clear.

9. The optical sensor module of claim 8, wherein a surface of the cover comprises a curvature lens.

10. The optical sensor module of claim 8, wherein a surface of the cover comprises a microstructure.

11. The optical sensor module of claim 8, wherein an internal surface of the cover is coated with a thin film, the thin film is selected from a group consisting of an anti-scratch thin film, an anti-reflective thin film, and a filter thin film.

12. The optical sensor module of claim 1, wherein the optical sensor module further comprises at least one of an analogue front end, a microcontroller, an operational amplifier, and a light source driver.

13. An optical sensing accessory comprising:

at least one optical sensor module of claim 1;

a communication module electrically connected to the optical sensor module; and

a housing containing the at least one optical sensor module and the communication module.

14. An optical sensing device comprising:

at least one optical sensor module of claim 1;

a microprocessor electrically connected to the optical sensor module;

a memory electrically connected to the optical sensor module and the microprocessor;

a power supply electrically connected to the optical sensor module and the memory; and

a housing containing the at least one optical sensor module, the microprocessor, the memory and the power supply.

15. The optical sensor module of claim 8, wherein an external surface of the cover is coated with a thin film, the thin film is selected from a group consisting of an anti-scratch thin film, an anti-reflective thin film, and a filter thin film.

16. The optical sensor module of claim 8, wherein an internal surface of the cover is spaced apart from the top surfaces of the first encapsulant and the second encapsulant by a predetermined distance.

17. The optical sensor module of claim 1, wherein the microstructure is a refractive microstructure or a diffractive microstructure, and the microstructure is configured for concentrating light toward a predetermined direction.

18. The optical sensor module of claim 17, wherein the refractive microstructure is configured as a Fresnel lens microstructure.

19. The optical sensor module of claim 17, wherein the diffractive microstructure is configured as a diffractive optical element microstructure.

20. The optical sensor module of claim 1, wherein the microstructure is configured as a concentric circular pattern.

21. The optical sensor module of claim 1, wherein the microstructure is configured as a set of concentric arcs concave toward the photodetector.

22. The optical sensor module of claim 1, wherein the partition is formed by an opaque material and is configured to a predetermined height to prevent light emitted from the light source directly to the photodetector.