REFLECTION -TYPE PHOTOINTERRUPTER

• US 20100109021A1
• Filed: 11/03/2009
• Published: 05/06/2010
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: HORIO, Tomoharu
• Granted Patent: US 8,053,800 B2
• Time in Patent Office: Days
• US Class Current: 257/82
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H01L 31/167 the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers

Abstract

A reflection-type photointerrupter of the present invention includes a substrate, a light emitting element and a light receiving element. The substrate includes a first surface, a second surface opposite the first surface, and a first and a second recesses that are open in the first surface side. The light emitting element is arranged in the first recess, while the light receiving element is arranged in the second recess. The light emitting element is capable of emitting light. The light receiving element is capable of receiving the light emitted from the light emitting element and reflected by an object to be detected.

Claims

1. A reflection-type photointerrupter comprising:

a substrate including a first surface, a second surface opposite the first surface, and a first and a second recesses that are open in a first surface side;

a light emitting element for emitting light, the light emitting element being arranged in the first recess; and

a light receiving element for receiving light emitted from the light emitting element and reflected by an object to be detected, the light receiving element being arranged in the second recess.

2. The reflection-type photointerrupter according to claim 1, wherein the light emitting element is entirely accommodated in the first recess, whereas the light receiving element is entirely accommodated in the second recess.

3. The reflection-type photointerrupter according to claim 1, wherein:

the substrate includes a first pad electrode forming at least part of a surface of the first recess, a second pad electrode forming at least part of a surface of the second recess, and a first and a second mount electrodes provided in the second surface side;

the light emitting element is bonded to the first pad electrode;

the light receiving element is bonded to the second pad electrode;

the first mount electrode includes a portion overlapping the first pad electrode in an in-plane direction of the substrate; and

the second mount electrode includes a portion overlapping the second pad electrode in the in-plane direction of the substrate.

4. The reflection-type photointerrupter according to claim 3, wherein the first pad electrode and the first mount electrode are in contact with each other, whereas the second pad electrode and the second mount electrode are in contact with each other.

5. The reflection-type photointerrupter according to claim 3, wherein the first pad electrode forms at least part of a bottom surface of the first recess, whereas the second pad electrode forms at least part of a bottom surface of the second recess.

6. The reflection-type photointerrupter according to claim 3, wherein the first pad electrode forms at least part of a side surface of the first recess, whereas the second pad electrode forms at least part of a side surface of the second recess.

7. The reflection-type photointerrupter according to claim 1, further comprising a projection made of a light-shielding material and standing on the first surface of the substrate between the first recess and the second recess.

8. The reflection-type photointerrupter according to claim 1, further comprising a molded resin covering the first surface side of the substrate.

9. The reflection-type photointerrupter according to claim 8, further comprising a projection made of a light-shielding material and standing on the first surface of the substrate between the first recess and the second recess, the projection penetrating the molded resin.

10. The reflection-type photointerrupter according to claim 8, wherein the molded resin contains dye.

11. The reflection-type photointerrupter according to claim 8, further comprising a filter provided on a side of the molded resin that is opposite to the substrate and including a portion facing the light receiving element, wherein:

the light emitting element is capable of emitting light of a wavelength range including a first wavelength range; and

transmittance of the filter for light of the first wavelength range is higher than transmittance of the filter for light of a second wavelength range, the second wavelength range being a shorter wavelength range than the first wavelength range.

12. The reflection-type photointerrupter according to claim 11, wherein the first wavelength range is the infrared wavelength range, whereas the second wavelength range is the visible wavelength range.

13. The reflection-type photointerrupter according to claim 11, wherein the first wavelength range is an infrared wavelength partial range that does not include a first boundary wavelength range, the first boundary wavelength range being part of the infrared wavelength range and continuous with the visible wavelength range;

the second wavelength range is a visible wavelength partial range that does not include a second boundary wavelength range, the second boundary wavelength range being part of the visible wavelength range and continuous with the infrared wavelength range;

the first and the second boundary wavelength ranges form a third wavelength range;

the third wavelength range is a wavelength range in which transmittance of the filter for light of the third wavelength range changes transitively between the transmittance for light of the first wavelength range and the transmittance for light of the second wavelength range.

14. The reflection-type photointerrupter according to claim 11, wherein the filter is a reflection film that is capable of reflecting light of the second wavelength range.

15. The reflection-type photointerrupter according to claim 11, wherein the filter is provided on the molded resin.

16. A reflection-type photointerrupter comprising:

a substrate;

a light emitting element for emitting light of a wavelength range including a first wavelength range, the light emitting element being arranged on the substrate;

a light receiving element for receiving light emitted from the light emitting element and reflected by an object to be detected, the light receiving element being arranged on the substrate;

a molded resin covering the light emitting element and the light receiving element on the substrate; and

a filter provided on a side of the molded resin that is opposite to the substrate and including a portion facing the light receiving element,

wherein transmittance of the filter for light of the first wavelength range is higher than transmittance of the filter for light of a second wavelength range, the second wavelength range being a shorter wavelength range than the first wavelength range.

17. The reflection-type photointerrupter according to claim 16, wherein the first wavelength range is the infrared wavelength range, whereas the second wavelength range is the visible wavelength range.

18. The reflection-type photointerrupter according to claim 16, wherein the first wavelength range is an infrared wavelength partial range that does not include a first boundary wavelength range, the first boundary wavelength range being part of the infrared wavelength range and continuous with the visible wavelength range;

the second wavelength range is a visible wavelength partial range that does not include a second boundary wavelength range, the second boundary wavelength range being part of the visible wavelength range and continuous with the infrared wavelength range;

the first and the second boundary wavelength ranges form a third wavelength range;

the third wavelength range is a wavelength range in which transmittance of the filter for light of the third wavelength range changes transitively between the transmittance for light of the first wavelength range and the transmittance for light of the second wavelength range.

19. The reflection-type photointerrupter according to claim 16, wherein the filter is a reflection film that is capable of reflecting light of the second wavelength range.

20. The reflection-type photointerrupter according to claim 16, wherein the filter is provided on the molded resin.