Light receiving module

• US 20080210850A1
• Filed: 09/24/2007
• Published: 09/04/2008
• Est. Priority Date: 09/22/2006
• Status: Abandoned Application

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Obika, Akira
• Application Number:
  US11/903,736
• Publication Number:
  US 20080210850A1
• Time in Patent Office: Days
• US Class Current: 250/216
• CPC Class Codes: G01J 1/02 Details
• CPC Class Codes: G01J 1/0209 Monolithic
• CPC Class Codes: G01J 1/04 Optical or mechanical part supplementary adjustable parts
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0422 using light concentrators, collectors or condensers
• CPC Class Codes: G01J 1/0474 Diffusers cavities G01J2001/0481
• 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 31/02325 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

Abstract

A light receiving module includes a substrate, a light receiving element mounted on the substrate, and a resin package for covering the light receiving element. The top portion of the resin package is formed with a lens for collecting external light to the light receiving element. The lens includes a light incident surface formed with irregularities for light dispersion. The light receiving module further includes a tubular body accommodated in the resin package. The tubular body is tapered as proceeding toward the light receiving element, and has an inner surface for light reflection. Light collected by the lens is reflected by the inner surface of the tubular body, to be detected by the light receiving element.

Claims

1. A light receiving module comprising:

a light receiving element; and

a resin package for covering the light receiving element, the resin package being formed with a lens for collecting light to the light receiving element;

wherein the resin package includes a surface serving as a boundary between substances of different refractive indexes and formed with irregularities.

2. The light receiving module according to claim 1, wherein the irregularities are rotationally symmetric with respect to a light axis of the lens.

3. The light receiving module according to claim 2, wherein the irregularities are obtained by rotating one of a sinusoidal waveform, a triangular waveform and a trapezoidal waveform around the light axis.

4. The light receiving module according to claim 1, further comprises a tubular body which is positioned between the lens and the light receiving element and is tapered as proceeding toward the light receiving element, the tubular body including a tapered inner surface for guiding light collected by the lens to the light receiving element, the tubular body also including an opening near the lens, the opening being larger than a light receiving surface of the light receiving element.