Illumination device and display unit for suppressing luminance unevenness and interference pattern

Patent metadata

Field	Value
Publication number	US-9239463-B2
Application number	US-201213425022-A
Country	US
Kind code	B2
Filing date	Mar 20, 2012
Priority date	Apr 4, 2011
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

An illumination device includes a light source section including a laser light source, and intermittently emitting, at a predetermined frequency, laser light emitted from the laser light source, an optical element passing the laser light emitted intermittently from the light source section, and a drive section vibrating the optical element at a predetermined vibration frequency. An expression 1 or 2 below is satisfied, where f 1 [Hz] denotes the frequency, f 2 [Hz] denotes a variable frequency of luminance in illumination light emitted from the optical element as a result of vibration of the optical element, n 1 denotes an arbitrary integer of 0 or larger and 10 or smaller, and n 2 denotes a predetermined integer of 1 or larger.

| n 1× f 1− f 2|≧20  1

| b 2× f 1− f 2|≦3  2

First claim

The invention is claimed as follows:

1. An illumination device, comprising:
a light source section including a laser light source, and intermittently emitting, at a predetermined frequency, laser light emitted from the laser light source;
an optical element passing the laser light emitted intermittently from the light source section; and
a drive section vibrating the optical element at a predetermined vibration frequency,
wherein the predetermined vibration frequency is set…

Assignees

• Yasui Toshifumi
• Sony Corp

Inventors

• Yasui Toshifumi

Classifications

• G02B5/045

  Physics · mapped topic

• H04N9/3111

  Electricity · mapped topic

• G02B27/48

  Physics · mapped topic

• G02B27/0927

  Physics · mapped topic

• G03B21/2033

  Physics · mapped topic