Patent Application
20150184828
1. Technical Field
The disclosure generally relates to optical lenses, and particularly relates to an optical lens to increase an illuminating angle of a light source and a light source module having the optical lens.
2. Description of Related Art
In recent years, due to excellent light quality and high luminous efficiency, light emitting diodes (LEDs) have increasingly been used as substitutes for incandescent bulbs, compact fluorescent lamps and fluorescent tubes as light sources of illumination devices.
Generally, light intensity of a light emitting diode gradually decreases from a middle portion to lateral sides thereof. Such a feature makes the LED unsuitable for functioning as a light source which needs a wide illumination, for example, a light source for a direct-type backlight module for a liquid crystal display (LCD). In some conditions, it is required to have an optical lens which can help the light emitted from a light emitting diode to have a wider illuminating angle and a special light distribution. Unfortunately, the conventional optical lens and a light source module having the conventional optical lens can not obtain a satisfactory effectiveness.
What is needed, therefore, is an improved optical lens and a light source module having the optical lens to overcome the above described disadvantages.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Embodiments of an optical lens and a light source module will now be described in detail below and with reference to the drawings.
Referring to
The optical lens 20 includes a light incident face 21 facing the light source 10, a light emitting face 22 opposite to the light incident face 21, and a connecting face 23 connecting the light incident face 21 and the light emitting face 22. The light source 10 has an optical axis O, around which light emitted from the light source 10 concentrates in a surrounding space.
In this embodiment of the present disclosure, the light source 10 is a light emitting diode (LED), and includes a supporting base 12 and an LED chip 14 mounted on the supporting base 12. The supporting base 12 is flat. The supporting base 12 may be made of electrically-insulating materials such as epoxy, silicon or ceramic. The LED chip 14 may be made of semiconductor materials such as GaN, InGaN, AlInGaN or the like. Preferably, the LED chip 14 emits visible light when being activated.
The optical lens 20 is integrally made of transparent materials such as PC (polycarbonate), PMMA (polymethyl methacrylate) or optical glass. It could be understood, a plurality of fluorescence, such as YAG, TAG, silicate, nitride, nitrogen oxides, phosphide, arsenide, telluride or sulfide, could be further provided to mix in the optical lens 20.
The optical lens 20 is located above and spaced from the light source 10. A center of a bottom face of the optical lens 20 is recessed inwardly, whereby the light incident face 21 and a receiving space 24 for accommodating the light source 10 are formed. The light incident face 21 includes a first light-incident facet 210 and a second light-incident facet 212. The first light-incident facet 210 is an inner face of the lens 20 which faces the light source 10 for the light emitted from the light source 10 with a small light-emergent angle passing through. The second light-incident facet 212 is another inner surface of the lens 20 surrounding the light source 10 for the light emitted from the light source 10 with a large light-emergent angle passing through. The first light-incident facet 210 is a planar face, and the second light-incident facet 212 is a cylindrical face. The connecting face 23 is an annular and planar face surrounding the light incident face 21. In use, the connecting face 23 is fitly attached on a supporting face (not shown) supporting the light source 10 and the optical lens 20.
The optical lens 20 defines a central axis I, and the optical lens 20 is axisymmetric relative to the central axis I. The central axis I of the optical lens 20 is aligned with the optical axis O of the light source 10. The light incident face 21 is axisymmetric relative to the central axis I. The light emitting face 22 is axisymmetric relative to the central axis I.
The light emitting face 22 includes a lateral face 222 extending upwardly from an outer periphery of the connecting face 23 and a top face 221 located above the light incident face 21. The top face 221 of the light emitting face 22 includes a center facet 2210 and a periphery facet 2212 surrounding and extending outwardly from the center facet 2210. A center of the top face 221 is recessed inwardly, whereby the center facet 2210 is formed. The center facet 2210 is a conical face. A diameter of the center facet 2210 gradually decreases along a top-to-bottom direction of the optical lens 20. The center facet 2210 is axisymmetric relative to the central axis I. In the embodiment of the present disclosure, the periphery facet 2212 is an annular and planar face. It could be understood that, the periphery facet 2212 can also be sculptured, ellipsoidal, spherical or paraboloidal. The periphery facet 2212 is axisymmetric relative to the central axis I. An outer periphery of the periphery facet 2212 of the top face 221 correspondingly intersects with that of the lateral face 222.
The lateral face 222 of the light emitting face 22 is a discontinuous face and includes a first lateral facet 2220 and a second lateral facet 2222 intersecting with the first lateral facet 2220. A bottom periphery of the first lateral facet 2220 correspondingly intersects with the outer periphery of the connecting face 23. In the embodiment of the present disclosure, the first lateral facet 2220 is a conical face. A diameter of the first lateral facet 2220 gradually decreases along the top-to-bottom direction of the optical lens 20. It could be understood that, the first lateral facet 2220 can also be cylindrical, sculptured, ellipsoidal, spherical or paraboloidal. The first lateral facet 2220 is axisymmetric relative to the central axis I. A top periphery of the second lateral facet 2222 correspondingly intersects with the outer periphery of the periphery facet 2212. In the embodiment of the present disclosure, the second lateral facet 2222 is a cylindrical face. It could be understood that, the second lateral facet 2222 can also be conical, sculptured, ellipsoidal, spherical or paraboloidal. The second lateral facet 2222 is axisymmetric relative to the central axis I.
Referring to
It is to be further understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102148564 | Dec 2013 | TW | national |
