Lamp structure of adaptive streetlight

• US 9,625,124 B2
• Filed: 07/31/2015
• Issued: 04/18/2017
• Est. Priority Date: 06/17/2015
• Status: Active Grant

• Current Assignee: National Central University
• Original Assignee: National Central University
• Inventors: Yang, Tsung-Hsun, Lee, Xuan-Hao, Lee, Chen-Hao, Sun, Ching-Cherng
• Primary Examiner(s): Sember, Thomas M
• Application Number:
  US14/814,724
• Publication Number:
  US 20160369978A1
• Time in Patent Office: 627 Days
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 14/006 by means of optical elements, e.g. films, filters or screens, being rolled up around a roller
• CPC Class Codes: F21V 17/002 with provision for interchangeability, i.e. component parts being especially adapted to be replaced by another part with the same or a different function F21V17/10 takes precedence
• CPC Class Codes: F21V 3/049 Patterns or structured surfaces for diffusing light, e.g. frosted surfaces
• CPC Class Codes: F21V 5/004 using microlenses
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lamp structure of an adaptive streetlight includes a housing, a plurality of light sources, and a surface-structured diffusion plate. The surface-structured diffusion plate enables the lamp structure to provide a light pattern conforming to the curvature of the road to be illuminated or other sites of application, thus reducing not only the number of lamps or streetlights required for a curvy road section, but also the associated installation cost and power consumption. The lamp structure can enhance road users'"'"' safety and the safety of our daily lives by increasing the illuminance on a curvy road and other sites of application that have special requirements.

Claims

1. A lamp structure of an adaptive streetlight, comprising:

a housing having a bottom surface and an opening;

a plurality of light sources fixedly provided on the bottom surface; and

a surface-structured diffusion plate, which is a light-permeable plate connected to the opening and provided with a plurality of microstructures, each said microstructure having a curved or parabolic surface as a light-receiving surface;

wherein at least one of the plurality of microstructures is different in shape from at least another one of the plurality of microstructures, the plurality of microstructures being configured so as to selectively modulate light passing through said diffusion plate and form a predetermined light pattern.

2. The lamp structure of claim 1, wherein each said light source is connected with a light-condensing device, and each said light-condensing device has a projection opening corresponding to the opening.

3. The lamp structure of claim 2, wherein each said light-condensing device collects light emitted by a corresponding said light source and projects the light through the projection opening toward the opening.

4. The lamp structure of claim 2, wherein each said light-condensing device is a condenser lens.

5. The lamp structure of claim 2, wherein each said light-condensing device is a reflector.

6. The lamp structure of claim 1, wherein each said microstructure has a length, a width, and a depth.

7. The lamp structure of claim 1, wherein the plurality of microstructures include a plurality of micro lenses arranged in an array.

8. The lamp structure of claim 6, wherein the length or the width of each of said plurality of microstructures is greater than ten times a wavelength of light emitted by each said light source.

9. The lamp structure of claim 7, wherein the length or the width of each of said plurality of microstructures is greater than ten times a wavelength of light emitted by each said light source.