Light signal

• US 20050122719A1
• Filed: 05/21/2004
• Published: 06/09/2005
• Est. Priority Date: 12/05/2003
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Liebscher, Jorg, Zimmermann, Dirk
• Application Number:
  US10/850,433
• Publication Number:
  US 20050122719A1
• Time in Patent Office: Days
• US Class Current: 362/257
• CPC Class Codes: B61L 2207/02 using light-emitting diodes [LEDs]
• CPC Class Codes: B61L 5/1845 Optical systems, lenses
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light signal with a luminous device and a first optical system for displaying signal indications on rail-bound traffic routes is provided. To allow different types of luminous devices to be used while retaining the first optical system, a second optical system is arranged between the luminous device and the first optical system. The focal point of the second optical system essentially coincides with a focal point of the first optical system on a light entry side.

Claims

1. A light signal with a luminous device and a first optical system for displaying signal indications on rail-bound traffic routes, comprising:

a second optical system arranged between the luminous device and the first optical system, where a focal point of the second optical system essentially coincides with a focal point of the first optical system on a light entry side.

2. The light signal as claimed in claim 1, wherein the luminous device is formed as an LED arrangement.

3. The light signal as claimed in claim 2, wherein the LED arrangement comprises a single LED which has a focusing lens as the second optical system.

4. The light signal as claimed in claim 2, wherein the LED arrangement is formed as an LED matrix with a plurality of essentially identical LED modules, which define an essentially circular radiation area.

5. The light signal as claimed in claim 1, wherein the luminous device is formed as an essentially circular luminous area and is based on organic LEDs.