Optical module that suppresses stray light

Patent metadata

Field	Value
Publication number	US-9977201-B2
Application number	US-201715647491-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Jul 12, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

An optical module includes a light-forming part and a protective member. The light-forming part includes a base member, a semiconductor light-emitting device, a lens, and a light-receiving device mounted on the base member and disposed, in the emission direction of the semiconductor light-emitting device, between the semiconductor light-emitting device and the lens. The light-receiving surface of the light-receiving device inclines toward the emission portion of the semiconductor light-emitting device such that an inclination angle θ is more than 0° and 90° or less, the inclination angle θ being an angle formed between the optical axis of the semiconductor light-emitting device and a plane including the light-receiving surface of the light-receiving device.

First claim

What is claimed is:

1. An optical module comprising:
a light-forming part configured to form light; and
a protective member that includes an output window configured to transmit light from the light-forming part and that is disposed so as to surround the light-forming part,
wherein the light-forming part includes
a base member,
a semiconductor light-emitting device mounted on the base member,
a lens mounted on the base member and configured to convert, in terms of spot size, light emitted from the semiconductor light-emitting device, and
a light-receiving device that is mounted on the base member, that is disposed, in an emission direction of the semiconductor light-emitting device, between the semiconductor light-emitting device and the lens, that includes a light-receiving surface, and that is configured to directly receive, at the light-receiving surface, light from the semiconductor light-emitting device, and

wherein the light-receiving surface inclines toward an emission portion of the semiconductor light-emitting device such that an inclination angle is more than 0° and 90° or less, the inclination angle being an angle formed between an optical axis of the semiconductor light-emitting device and a plane including the light-receiving surface of the light-receiving device.

2. The optical module according to claim 1 , wherein the inclination angle is 5° or more.

3. The optical module according to claim 1 , wherein the inclination angle is 45° or less.

4. The optical module according to claim 1 , wherein the inclination angle is 30° or less.

5. The optical module according to claim 1 , wherein the semiconductor light-emitting device is a laser diode.

6. The optical module according to claim 1 , wherein
the light-forming part includes
a plurality of the semiconductor light-emitting devices mounted on the base member,
a plurality of the lenses mounted on the base member, and disposed so as to individually correspond to the plurality of semiconductor light-emitting devices,
the light-receiving device mounted on the base member, and disposed so as to correspond to at least one semiconductor light-emitting device of the plurality of semiconductor light-emitting devices, and
a wavelength selective filter mounted on the base member, and configured to multiplex light from the plurality of semiconductor light-emitting devices.

7. The optical module according to claim 6 , wherein the plurality of semiconductor light-emitting devices include a semiconductor light-emitting device configured to emit red light, a semiconductor light-emitting device configured to emit green light, and a semiconductor light-emitting device configured to emit blue light.

Assignees

• Sumitomo Electric Industries

Inventors

• Enya Yohei
• Nakanishi Hiromi
• Ishihara Kuniaki

Classifications

• F21S41/147

  the main emission direction of the LED being angled to the optical axis of the illuminating device · CPC title

• G02B6/4246 Primary

  Bidirectionally operating package structures · CPC title

• G02B6/2938

  for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM · CPC title

• G02B6/4206

  Optical features (G02B6/4207, G02B6/421 take precedence) · CPC title

• G02B6/4209

  Optical features · CPC title