TWI386597B - Optical lens and lighting device comprising the same - Google Patents

Description

Optical lens and illumination device including the same

The present invention relates to an optical lens for an illumination device; in particular, an optical lens that enhances the illumination uniformity of the illumination device.

With the advancement of light-emitting diode (LED) manufacturing technology and its advantages of high luminous efficiency, long service life and fast reaction time, LEDs have been widely used as illumination sources and optical lenses. The use of light to cause the light generated by the LED to be projected on a predetermined area to obtain an illumination effect. Since the illumination of the LED is directional, most of the illumination is concentrated in a specific direction. Therefore, when applied to an illumination device, excessive concentration of light intensity will result in extremely uneven illumination, that is, light in the specific direction. The intensity will be much larger than the surrounding area. If the lighting effect is illuminating as an ambient lighting, the uneven lighting effect will cause the user to feel extremely uncomfortable.

As shown in Fig. 1, a conventional optical lens 10 is used for an illumination device 1, and the illumination device 1 includes an LED bulb 14 having an LED as a light source. The outer shape of the optical lens 10 is substantially a truncated cone having a top surface 11, a bottom surface 12, a side wall 13, and a receiving portion (not shown). The accommodating portion is disposed on the bottom surface 12 to accommodate the LED bulb 14 . Thereby, the light emitted by the LED bulb 14 can be emitted through the top surface 11 and the side wall 13. Since the main illumination direction of the LED bulb 14 is projected toward the top surface 11, the intensity of the light transmitted through the center of the top surface 11 is the strongest, and the light intensity is weaker as the center direction is used as the reference. The light intensity of the illuminated area forms a concentric circular uneven distribution, so that the illumination device 1 using the conventional optical lens 10 will not provide a uniform intensity illumination effect, and the brightness contrast in the light-irradiated area will be extremely high, and it will not be possible. Provide users with comfortable lighting effects.

In view of the above, an optical lens is provided, which can effectively improve the illumination uniformity of an illumination device using an LED bulb as a light source, which is an urgent problem to be solved in the industry.

An object of the present invention is to provide an optical lens for illuminating a light emitting diode (LED) bulb as a light source, which can make a light bulb provided by the LED bulb form a plurality of uniform An ordinary light, and controlling the uniform optical rings to be projected toward a illuminated area, wherein the uniform light rings are partially overlapped to illuminate the illuminated area, thereby improving illumination uniformity of the illuminated area and reducing The brightness contrast in the illuminated area is poor.

In order to achieve the above object, the present invention discloses an illumination device having an optical lens, the illumination device comprising an LED bulb adapted to provide a light, the optical lens comprising a stacking member, a receiving portion and a recess. Wherein, the accommodating portion is disposed on a bottom surface of the stacking member to accommodate the LED light bulb, the stacking member has a plurality of stacked layers, each of the stacked layers has a convex curved surface, and the recessed portion is disposed On the top surface of one of the stacked members. Thereby, the light can be incident on a illuminated area via the convex curved surfaces and the concave portion. Wherein, the recessed portion can uniformly diverge the light provided by the LED bulb to avoid forming a portion where the light intensity is excessively concentrated in the illuminated area, and the light can simultaneously form a plurality of convex curved surfaces outside the stacked layers. The aura of uniform intensity is irradiated to the illuminated area at least partially overlapping, which improves the illumination uniformity of the illuminated area and reduces the contrast of the brightness compared to the conventional illumination device.

Referring to FIG. 2 and FIG. 3 in combination, in one embodiment of the present invention, an illumination device 3 having an optical lens 2 is omitted, and the components in FIG. 3 which are identical to those in FIG. 2 are omitted. The illuminating device 3 includes an LED bulb 31 which is a light source diode (LED) as a light source, and is suitable for providing a light. The optical lens 2 includes a stacking member 21, a receiving portion 22, and a recessed portion 23. The stacking member 21 has a plurality of stacked layers 211, and each of the stacked layers 211 has a convex curved surface 211a. Next, the accommodating portion 22 is disposed on one bottom surface 212 of the stacking member 21 to accommodate the LED bulb 31, and the recess portion 23 is disposed on one of the top surfaces 213 of the stacking member 21. Thereby, the light provided by the LED bulb 31 can be emitted through the plurality of convex curved curved surfaces 211a and the recessed portions 23, and is irradiated to a illuminated area (not shown).

Based on the illumination characteristics of the LED, the LED bulb 31 has a main illumination direction in which the main light energy is scattered in the main direction, that is, has a large light intensity along the main direction. In the present embodiment, the main direction passes through the LED bulb 31 and extends in one of the directions toward the recess portion 23. Therefore, in the embodiment, the recessed portion 23 is substantially designed as a concave arcuate curved surface. Thereby, the light having a larger energy can be emitted after being diffused through the recessed portion 23, thereby preventing the light intensity from being excessively concentrated, and forming an uneven illumination effect in the illuminated area.

Secondly, the plurality of stacked layers 211 of the stacked member 21 have substantially the same one-circle contour respectively, and are adapted to receive the light scattered by the LED bulb 31 from all directions, and the plurality of stacked layers 211 are sequentially spaced from the bottom surface 212. The light is stacked in parallel in one of the directions of the top surface 213, and the light can be layered through the plurality of stacked layers 211 to illuminate the illuminated area. Further, each of the convex curved surfaces 211a of the plurality of stacked layers 211 respectively has a curvature suitable for controlling the light scattered from the LED bulb 31 to be emitted by the convex curved surfaces 211a at a predetermined angle. However, it is not limited thereto. In other embodiments, the curvatures of the convex curved surfaces 211a are substantially unequal, and the LED bulbs 31 of different wavelength ranges and bulb shapes are matched to control the light from each other. The convex curved surface 211a is emitted at different angles. The curvature of each convex curved surface 211a can be designed by using a simulation software, and the simulated soft system defines each curvature according to the optical basic principle.

By the configuration of the plurality of stacked layers 211, the light scattered from the LED bulb 31 is adapted to form a plurality of optical rings (not shown) having uniform light intensity through the respective stacked layers 211. Wherein, the aura emitted by the stacked layer 211 of the upper layer (ie, a smaller proportion of the annular profile) is closer to the main light emitting direction of the LED bulb 31, and therefore, the light intensity thereof is higher than that of the lower layer (ie, a larger ratio). The aura of the stacked layer 211 of the annular profile). By the different curvatures of the convex curved surfaces 211a of the plurality of stacked layers 211, the positions and ranges of the respective optical rings can be controlled, so that the optical rings are illuminated at least partially overlapping each other in the illuminated area. A range of light intensity averages formed. At the same time, the light of the main light-emitting direction of the LED bulb 31 is emitted in a scattered manner in cooperation with the recessed portion 23, so as to avoid excessive concentration of light intensity in the illuminated area. Therefore, through the plurality of auras formed in the embodiment and scattering the light in the main light-emitting direction, a uniform illumination effect can be formed in the illuminated area, and the difference in brightness contrast can be reduced.

4 is a graph of light intensity versus viewing angle on a plane of the illumination device 3 according to the present invention, wherein the plane passes through the center of the top surface 213 and the bottom surface 212 of the stacking member 21, and the stacked member The 21 series has seven stacked layers 211. In Fig. 4, the horizontal axis represents the view angle, and the vertical axis represents the relative intensity of light, wherein the viewing angle is defined as the plane passing through the LED bulb 31 directly above the LED bulb 31. The direction defines a viewing angle of 0° and rotates a quarter circle in a clockwise and counterclockwise direction, respectively defining a viewing angle of 90° and -90°. Thereby, the situation of the light intensity distribution at each viewing angle when the light of the LED lamp 31 is projected can be further understood through FIG. As shown, the 0° viewing angle and its adjacent viewing angle within a range are substantially the main direction of illumination of the LED bulb 31, and the light in this direction is due to the concave arc surface passing through the recess 23 It is emitted, so it can effectively diverge the light, avoiding the formation of light with excessive intensity in the illuminated area, and forming a valley curve region with relatively low relative intensity of light (as indicated by the dotted line in Fig. 4). Secondly, with respect to the complex peak curve shown in FIG. 4, it represents the intensity of light emitted from each of the convex curved surfaces 211a of the seven stacked layers 211, respectively, wherein the two peaks near the 0° viewing angle are caused by the distance LED bulb. The main light direction of 31 is relatively close, so the relative intensity of light is the largest. Since each stacked layer 211 of the stacked member 21 is stacked in parallel, each stacked layer 211 receives light of substantially the same intensity at the same viewing angle (for example, 30° and -30°), so in FIG. 4, a complex relative is formed. The peak curve which is symmetrical at a viewing angle of 0°, that is, the intensity of the light of each symmetrical peak curve is equal. The complex symmetrical peak curve substantially represents that the plurality of auras emitted from each of the convex curved surfaces 211a of the complex stacked layer 211 have a uniform intensity, and cooperate with the recess 23 to diverge the intensity of the light in the main illumination direction. The area forms a uniform illumination effect. The manner in which the detailed uniform illumination effect is formed has been mentioned above, and will not be described herein. In other embodiments, the stacking member 21 may have other numbers of stacked layers 211 and form a corresponding number of halos.

At least one of the plurality of stacked layers 211 of the optical lens 2 of the present invention has an inner wall 211b for defining the receiving portion 22. The accommodating portion 22 has a shape corresponding to one of the LED bulbs 31, so that the optical lens 2 and the LED bulb 31 are closely attached. Thereby, the light is directly transmitted through the optical lens 2 to reduce the light intensity of the light emitted from the LED bulb 31 through the air or other medium. Preferably, in the embodiment, the stacking member 21 is more integrally formed to avoid a gap between the stacked layers 211, so that light is emitted from the slit and cannot be projected to a predetermined illuminated area.

In this embodiment, one of the stacked members 21 is selected from the group consisting of polymethyl methacrylate (PMMA) and polycarbonate (PC), wherein polymethyl methacrylate and poly The carbonate material provides substantially 95% and 90% light transmittance, respectively, and enhances the overall light intensity of the illuminated area. However, the stacked member 21 is not limited to the above materials, and other materials having high light transmittance may be applied to the stacked member 21.

In this embodiment, the illuminating device 3 further has a socket 32, and the optical lens 2 further has a connecting member 24, wherein the LED bulb 31 is disposed on the socket 32, and the connecting member 24 is adapted to be coupled to the socket 32. . Thereby, the optical lens 2 can be closely attached to the LED bulb 31 to avoid light loss. In practical applications, the connecting member 24 can be coupled to the socket 32 in a manner of fitting, fitting, and screwing. However, the manner in which the optical lens 2 and the LED bulb 31 are combined is not limited to the above, and those skilled in the art can easily infer other implementations, and details are not described herein.

In summary, the present invention provides an illumination device having an optical lens. The optical lens of the present invention is adapted to the main light intensity of the LED bulb by the recessed portion compared to the uneven illumination effect formed by the conventional illumination device. Diffusion, and controlling the projection direction of the light ring with uniform light intensity by the convex curved surfaces of the plurality of stacked layers, thereby improving the illumination uniformity of the illumination device and reducing the contrast of the brightness of the illuminated area, so that it can be widely used. It is used in all kinds of ambient lighting, such as table lamps, street lamps, etc., to provide uniform lighting effects.

The above embodiments are only used to exemplify the implementation of the present invention, and to explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or equivalences that can be easily accomplished by those skilled in the art are within the scope of this creation. The scope of protection of this creation shall be subject to the scope of the patent application.

1. . . Lighting device

10. . . optical lens

11. . . Top surface

12. . . Bottom

13. . . Side wall

14. . . Light-emitting diode bulb

2. . . optical lens

twenty one. . . Stacking member

211. . . Stacking layer

211a. . . Convex curved surface

211b. . . Inner wall

212. . . Bottom

213. . . Top surface

twenty two. . . Housing

twenty three. . . Depression

twenty four. . . Connecting member

3. . . Lighting device

31. . . Light-emitting diode bulb

32. . . Lamp holder

Figure 1 is a schematic exploded view of a conventional illumination device;

2 is a schematic view of an optical lens according to an embodiment of the present invention;

Figure 3 is an exploded view of the illuminating device according to an embodiment of the present invention having the optical lens of Figure 2;

Figure 4 is a graph showing light intensity distribution of a lighting device in a plane in accordance with an embodiment of the present invention.

2. . . optical lens

twenty one. . . Stacking member

twenty three. . . Depression

3. . . Lighting device

31. . . Light-emitting diode bulb

32. . . Lamp holder

Claims (24)

An optical lens for an illumination device, the illumination device comprising a light emitting diode (LED) bulb adapted to provide a light, the optical lens comprising: a stacking member having a plurality of convex curved curved surfaces; An accommodating portion is disposed on a bottom surface of the stacked member to accommodate the LED light bulb; and a recess portion is disposed on a top surface of the stacked member; wherein the light passes through the convex curved shape The curved surface and the depressed portion are emitted. The optical lens of claim 1, wherein the stacking member has a plurality of stacked layers, each of the stacked layers having each of the convex curved surfaces. The optical lens of claim 2, wherein each of the stacked layers is stacked from the bottom surface toward one of the top surfaces in order from large to small. The optical lens of claim 1, wherein each of the convex curved surfaces has a curvature. The optical lens of claim 4, wherein each of the curvatures is substantially unequal. The optical lens of claim 2, wherein the stacked layers are substantially identical in one of the annular profiles. The optical lens of claim 1, wherein the depressed portion is substantially a concave arcuate curved surface. The optical lens of claim 2, wherein at least one of the stacked layers has an inner wall for defining the receiving portion. The optical lens of claim 1, wherein the receiving portion has a shape corresponding to one of the LED bulbs. The optical lens of claim 1, wherein one of the materials of the stacked member is selected from the group consisting of polymethyl methacrylate (PMMA) and polycarbonate (PC). The optical lens of claim 1, wherein the stacked member is an integrally formed structure. The optical lens of claim 1, wherein the illumination device further has a socket, the optical lens further has a connecting member, the LED bulb is disposed on the socket, and the connecting member is adapted to the socket link. A lighting device comprising: a light emitting diode (LED) bulb adapted to provide a light; and an optical lens comprising: a stacking member having a plurality of convex curved curved surfaces; and a receiving portion And a recessed portion is disposed on a top surface of the stacked member; wherein the light passes through the convex curved surface and the recessed portion Shoot out. The lighting device of claim 13, wherein the stacking member has a plurality of stacked layers, each of the stacked layers having each of the convex curved surfaces. The lighting device of claim 14, wherein each of the stacked layers is stacked from the bottom surface toward one of the top surfaces in order from large to small. The lighting device of claim 13, wherein each of the convex curved surfaces has a curvature. The illumination device of claim 16, wherein each of the curvatures is substantially unequal. The lighting device of claim 14, wherein the stacked layers are substantially separate Have the same one of the circular contours. The lighting device of claim 13, wherein the recessed portion is substantially a concave arcuate curved surface. The lighting device of claim 14, wherein at least one of the stacked layers has an inner wall for defining the receiving portion. The lighting device of claim 13, wherein the receiving portion has an appearance corresponding to one of the LED bulbs. The lighting device of claim 13, wherein one of the materials of the stacked member is selected from the group consisting of polymethyl methacrylate (PMMA) and polycarbonate (PC). The lighting device of claim 13, wherein the stacking member is an integrally formed structure. The illuminating device of claim 13, wherein the illuminating device further has a socket, the optical lens further has a connecting member, the LED bulb is disposed on the socket, and the connecting member is adapted to the socket link.