Secondary Optical Lens for LCD Backlight System
A secondary optical lens and LED lens technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of too bright spot center, difficult to evenly illuminate the LCD screen, etc., to achieve the effect of shortening the distance and reducing the thickness
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no. 1 Embodiment approach
[0049] The first embodiment of the LED lens device related to the present invention, the cross-sectional view of the lens device is as figure 1 As shown, the front view, perspective view, top view, right view, and bottom view of the lens according to this embodiment are shown in FIG. 2. The lens device includes an LED light source, a secondary optical lens 1 and a filter 2. The secondary optical lens 1 is characterized in that there is an inner groove under the lens near the middle of the LED light source, the side surface 11 of the inner groove is an arc-shaped revolving surface (that is, the section line is an arc), and the inner groove The top surface 13 is an aspheric condensing surface; there is a cylindrical protrusion above the lens, and a conical reflecting surface 14 recessed downward in the middle of the protrusion, on which there is a step 16 for placing the filter, the convex The outer surface 15 is a cylindrical curved surface with a slight slope as the light-emitt...
no. 2 Embodiment approach
[0066] In the second embodiment, except that the light distribution curved surface 122 on the outer surface of the secondary optical lens is different from the first embodiment, the other structures are basically the same as the first embodiment. The design principle of the second specific embodiment is as follows Picture 12 As shown, all the output light that passes through the light distribution curved surface 122 and the optical axis is θ max , And in the specific embodiment, the output light that is distributed through the light distribution curved surface 12 is uniformly distributed at an angle of 0 to θ with the optical axis OZ max Between angles, here θ max It is also preferably 85°. In terms of appearance, the curved surface 122 of the second embodiment is flatter, while the light distribution curved surface 12 of the first embodiment looks like a rounded arc at the junction with the cylindrical outer surface 15 above the lens.
[0067] The second embodiment has a w...
no. 3 Embodiment approach
[0069] The third embodiment of the secondary optical lens involved in the present invention, its cross-sectional view is as Figure 15 Shown. The difference from the first embodiment is that the side surface 113 of the concave portion under the lens near the middle of the LED is a tapered surface. The design method of the other surfaces is the same as the first embodiment, including the concave top surface 133 is an aspheric condensing surface; there is a cylindrical protrusion above the lens, and a downwardly concave cone is located in the middle of the protrusion. A total reflection surface 143, on which there is a step 163 for placing the filter, the convex outer surface 153 is a slightly inclined cylindrical light-emitting surface; the outer ring side surface 123 of the lens is also a light-emitting surface, which plays a role in light distribution Function, it is a continuous smooth curved surface; the bottom surface 173 of the lens is a non-optical surface, on which there...
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