Title:
微小回折監視照明装置
Document Type and Number:
Japanese Patent JP2010504596
Kind Code:
A
Abstract:
An active infra-red surveillance illuminator uses a statistically mono-directional micro-diffractive material overlaid on a bank of light emitting diodes (LEDs) to refract light from the LEDs onto a target image. This delivers energy distribution profiles out to a distance to match the aspect ratios of current wide-angle target and wide-angle camera surveillance systems. The distribution of refracted light is elliptical. This distribution can vary by using different diffractive material in conjunction with various numbers, brightness and angles of the LEDs in an LED bank. The effective range of the illuminators is greatly extended with this type of illumination. By limiting infrared (IR) radiation down to a 10 degree vertical window it renders the IR illumination much more effective for surveillance imaging by providing much more effective power on wide, ground-level scenes, and particularly enables multi-lane license plate capture.
Inventors:
Tony Meyer
Mark Vernon
Mark Vernon
Application Number:
JP2009529474A
Publication Date:
February 12, 2010
Filing Date:
September 25, 2006
Export Citation:
Assignee:
Tony Meyer
International Classes:
G08G1/04; F21V5/00; F21V9/00; F21V29/70; G02B3/00; G02B3/08; G02B5/00; G02B5/32; G08G1/017; H04N7/18; F21K9/00; F21S2/00; F21Y101/02
Domestic Patent References:
| JP2006024378A | 2006-01-26 |
Foreign References:
| US5926257A | 1999-07-20 | |||
| GB2248994A | 1992-04-22 | |||
| WO2001039153A1 | 2001-05-31 | |||
| WO2006067653A2 | 2006-06-29 |
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Suita Reiko
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Suita Reiko