Abstract:
The present invention is an LED lamp lens, on which orderly arranged surface plural protuberances. And with the differences of light perviousness, a particular luminous pattern of the LED lamp is displayed when the LED lamp is turned on.

Description:
RELATED APPLICATIONS 
   This application claims priority to Taiwan Application Serial Number 96211247, filed Jul. 10, 2007, which is herein incorporated by reference. 
   BACKGROUND 
   1. Field of Invention 
   The present invention relates to a light-emitting diode lamp lens structure. More particularly, the present invention relates to a light-emitting diode lamp lens structure of plural protuberances. 
   2. Description of Related Art 
   Light-Emitting Diodes (LED) are widely used in electronic devices or for lamp illumination. The general lamp with a circular surface irradiation is customarily used, though the light-emitting diode chips are arranged as arrays on the circuit panel of an LED lamp. In prior art, several light-emitting diodes are commonly used to form an LED lamp set, and LED lamp sets are arranged in round shapes to form a circular surface irradiation. 
   With the light decoration, the LED lamp is gradually replacing the conventional light bulb as in Christmas tree decorations, shop window decorations, ambient interior lighting, etc. But, the conventional LED lamp is packaged in a single protuberance lens making displaying different specific luminous patterns for light decorations difficult. 
   SUMMARY 
   For this reason, this invention provides an LED lamp lens structure with several protuberances on the surface of the package lens of the LED lamp. Light is emitted through lens package protuberances that have different three-dimensional shapes. The light beams are emitted out from the LED lamp with different intensities of light perviousness and color contrasts due to the different thickness of protuberances. Therefore, it is possible to display different specific luminous patterns, such as the shape or the texture of a flower petal, and a flower bud. 
   This invention also provides an LED lamp lens structure with several protuberances on the surface of the package lens of the LED lamp. And depending on the specifications of the manufacturer, the three-dimensional protuberance shapes on the LED lamp lens are designed as a hemisphere, a cone, a cylinder, and combinations thereof. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
       FIG. 1  illustrates the preferred embodiment of LED lamp lens structure of this invention. 
       FIG. 2˜FIG .  5  illustrate the three-dimensional geometry shape of the preferred embodiment of the lamp lens of this invention. 
   

   DETAILED DESCRIPTION 
   Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
   Refer to  FIG. 1 .  FIG. 1  illustrates the preferred embodiment of an LED lamp lens structure of this invention. As shown in  FIG. 1 , the disclosed LED lamp  100 , comprises a package base  110  with an electrically conductive stand  120  disposed thereon, and an LED chip  130 , disposed on the electrically conductive stand  120  in the package base  110 . The electrically conductive stand  120  has an indentation  121 , where the LED chip  130  is disposed. The LED chip  130  is connected to the electrically conductive stand  120  via the conductive line  150 , and is packaged under the package lens  140  in the LED lamp  100 . The outer surface of the package lens  140  has a central protuberance  141  and a plurality of peripheral protuberances  142 . The center of central protuberance  141  is aligned to the LED chip  130  in the package base  110  to form the package lens  140  with plural protuberances. 
   Refer to  FIG. 2˜FIG .  5 .  FIG. 2˜FIG .  5  illustrate the three-dimensional geometry shape of the preferred embodiment of the lamp lens of this invention. The central protuberance  141  of the circular cross-section and the peripheral protuberance  142  of the circular cross-section are on the outer surface of the package lens  140 . And the maximum radius of the circular cross-section of the peripheral protuberance  142  is less than or equal to the maximum radius of the circular cross-section of the central protuberance  141 . The peripheral protuberances  142  are arranged in rings around the center of the central protuberance  141  as the circle center. Therefore, a package lens  140  with a central protuberance  141  in the center and plural rings of peripheral protuberances  142  surrounded thereon can be designed. Nevertheless, the three-dimensional shape of the central protuberance  141  and the peripheral protuberance  142  are both selected from the group of a part of a hemisphere (as shown in  FIG. 2 ), a cone (as shown in  FIG. 3 ), and a cylinder (as shown in  FIG. 4 ) to form the package lens  140 . Or, either one of the central protuberance  141  and the peripheral protuberances  142  is the three-dimensional shape of a part of a hemisphere, a cone, and a cylinder to form the package lens  140  (as shown in  FIG. 5 ). Therefore, through different three-dimensional shapes of protuberances on the package lens  140 , the light beams emit out from the LED lamp  100  having different intensities of light perviousness and color contrasts due to the different thickness of protuberances. 
   By the LED lamp lens structure of this invention, it is possible to display different specific luminous patterns of sight vision, such as the shape or the texture of a flower petal, and a flower bud. 
   Although the present invention has been described in considerable detail with reference certain embodiments thereof, other embodiments are possible. Therefore, their spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. 
   It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims.