Patent Application
20150016117
The application claims the benefit of a TAIWAN Patent Application Serial Number 102213266, filed on Jul. 10, 2013, which is herein incorporated by reference in its integrity.
The present invention pertains to a light emitting diode (LED) bulb device, particularly, to a LED bulb having a flat base inside, with wide-angle light emitting effect.
In the oil electric double up today, with high power consumption, shorter operated time or say the lifetime, as the traditional incandescent bulb is, it increases the indoor temperature too. Therefore, governments have been progressively banned use and the production of incandescent bulbs since 2010 and replaced them by energy saving bulbs because the energy saving bulbs provides same lumens, but use only about 1/4 power.
Nowadays, LED bulbs are found more favorite over the energy-saving bulbs. The advantages include more energy saving and longer durable and operated longer (30,000 hours or above), mercury free, and no UV. Therefore, the LED bulbs are high hopes and become synonymous of energy saving and environmental friendly too.
LED chip is known as high directivity as a point source. When a conventional LED bulb installed in the E27 lamp socket lighting, there is no ceiling light. A LED bulb is generally called as half omnidirectional LED bulb since it has angles in a range between about 120°-180°. For many users accustomed using incandescent bulbs or energy saving bulbs may feel something weird for the illuminated area.
Thus, recently, there have been many omnidirectional LED bulbs sold in the appliance lighting market. The LED bulbs have angles between about 180 degrees to 360 degrees. They can make the ceiling certain brightness. The illuminating angle of the LED is comparable to incandescent bulbs or energy saving light bulbs. Thus, the omnidirectional LED bulbs are found more popular than the otherwise.
To overcome the high directivity and approach the purpose of omnidirection, the conventional omnidirectional LED bulbs usually assembled two or three LED substrates to become 3-D modeling. An example is shown in Taiwan Patent Publication No. 200,708,684, as seen
Another conventional technique may refer to the Taiwan patent No. M412319. The feature is shown in the
The LED bulb in accordance with the second embodiment may provide omnidirection effect more than that of the first embodiment. Nevertheless, the modeling pedestal 5 may increase the cost and have worse heat dissipation capability.
A wide-angle light emitting diode (LED) bulb comprises a lamp head, a lamp cup housing a LED pedestal with one LED submount thereon, and a LED driver components and a half global cover. The lamp cup is modeled with a plurality of cabin-shaped recesses formed around a circumference surface of the lamp cup to increase heat sink area. Each recess has an aperture formed therein for backward light emitting by said LED submount passed therethrough. The half global cover engaged with an edging of a first ending of the lamp cup. The lamp head engages with an edging of a second ending of the lamp cup for screwing with a socket.
The backward light is a scattered LED light scattered by diffused powders on the bulb cover and the high reflectivity lamp cup. The backward light is occupied between about 1.7˜2% of total lumens of LED light for a beam angle larger than 135° or between about 9.9%˜10.2% for a beam angle larger than 90°, which is almost two times of lumen in comparison with a LED bulb without an aperture.
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
For convenient illustrating the embodiment, hereinafter, the direction of “backward”, “forward”, and “upward”, or “downward” are named with respect to an installed LED bulb. It is thus the terms “backward” and “upward” Indicated the direction is toward the ceiling and “forward” or “downward” Indicated the direction is toward the floor.
The present invention discloses a wide-angle LED bulb, in particularly relates to a LED bulb having one planar LED substrate only rather than assembled two or three LED substrate in different directions such as three-dimensional modeling as the prior art but can produce similar effect as an omnidirection LED bulb. Herein the LED bulb according to the present invention is called as a wide-angle LED bulb since the backward light beam is over two folds than that of LED bulb without any aperture. It is due to the LED lamp cup has several apertures formed therethrough so that a secondary portion of light beam can through them emitting backward light and a main portion of light emitting forward through the cover. Furthermore, brightness, uniformity, and beam illuminating range backward can be adjusted by modified the inclined angles of the apertures and the sizes and/or the reflectivity of the lamp cup 20 and the curvatures of the sidewalls of the cabin-shaped recess 30, please see
Referring to
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The secondary portion of the emitting light through the apertures 38 backward to the ceiling, a direction along the connection line between the lamp head 10 and the apex of the half global cover 20.
The main portion of the emitting light is out through the half global cover 20. Since the emitting light includes the main portion downward and the minor portion upward, thereby the beam angle is found over 90°. The beam angle 90° is equal to a LED angle 180°. The experimental report from the device according to the present invention is shown in Table 1, which is shown in the following paragraph:
The results shown the beam angle backward, the brightness and beam sizes can be adjusted by modified the inclined angles and total opening area of the apertures with high reflectivity of the lamp cup 20. To increase the reflectivity, the color of the lamp cup 20 is preferred to be white or other light colors. Furthermore, the total lumens increase with the aperture area. The curvatures of the curved surface of the cabin-shaped recess 30 can also be utilized to modify the illuminating range and the brightness. The sidewall of the cabin-shaped recess 30 is consisting of two surfaces, a main curved surface 51 and a sub-curved surface 53. The sub-curved surface 53 is the small one surrounded by the main curved surfaces 51. In a preferred embodiment, the inclined angle of the aperture is set between about 0°˜75° measured from the optical axis, e.g. if the sub-curved surface 53 is along a vertical direction, the inclined angle is of 0° and if the sub-curved surface 53 is inclined, the angle increased.
The present invention has the following benefits:
(1) In comparison with the prior arts using two or three LED boards or 3-D modeling board, the wide-angle LED bulb has one planar LED board only according to the present invention. The wide-angle LED bulb provides a similar effect as an omnidirectional LED bulb. Thus it can cost down an omnidirectional LED bulb.
(2) With the areas of the aperture increase, the portion of backward light increases.
(3) The backward light scattered by diffused powders on the bulb cover and the lamp cup is occupied between about 1.7˜2% of total lumens of LED light for a beam angle larger than 135 or between about 9.9%˜10.2% for a beam angle larger than 90° comparing to 1% and 5.9%, respectively, for a lamp cup without an aperture.
As is understood by a person skilled in the art, the foregoing preferred embodiments of the present invention are illustrated of the present invention rather than limiting of the present invention. It is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102213266 | Jul 2013 | TW | national |
