Patent Application
20160013379
1. Field of the Invention
The present invention relates to an emitting device of wide-angle LED, particularly to one that has a wide-angle LED with wider emitting area and more intensive luminance, so that when engaging an emitting device the number needed for construction is reduced and the quality and effectiveness are improved.
2. Description of the Related Art
Nowadays LED technology is getting advanced and widely applied to emitting devices constructions, and the luminance quality of the devices lies in the optical design of LED structure. Basically the optical design can be divided into primary optics and secondary optics. The structures are as below.
1. Primary optics: within the LED packaging, a colloid in shape of lens covers the LED chip and is fixed on a base, which can adjust the spreading or dispersing of lights; in other words, it functions as a first optical lens and the lights getting through it are in a fixed direction and emitting form. The angle is usually between 110° and 120°.
2. Secondary optics: in LED application, different devices require different light dispersion and the secondary optics design is for adjustment of the dispersion. The design is basically a second lens for the lights to get through after the primary optical process in order to adjust and/or transform the lights.
However, such optical design neglects the relevance between the primary and secondary optics. Lower relevance has stronger influence on the device. For example, the more intensive the lights are, the narrower the emitting angle is, and the lights are more concentrated. But such concentration would require the distance between each LED arranged less than 1.5 cm, resulting more numbers needed for construction; or when the distance is longer than 1.5 cm, the lights would not emit uniformly and there would be dark areas. Therefore, it is desirable to focus on relevant designs of LED in order to lower the costs and improve the quality of the device.
The primary object of the present invention is to provide an emitting device of wide-angle LED in which the wide-angle LED establishes a crossing and overlapping light dispersion via refraction of primary and secondary optics, in order to extend the distance between each wide-angle LED and thus reduce the number needed to construct the present invention; in other words, to reduce the prime costs.
Another object of the present invention is to provide an emitting device of wide-angle LED in which the wide-angle LED enhances the lights in the primary optical process, concentrating the lights and heightening the intensity, and in the secondary optical process the lights spread out uniformly, so as to improve the quality of the present invention.
In order to achieve the objects above, the present invention comprises a wide-angle LED and an emitting device constructed of the wide-angle LED.
The wide-angle LED includes a base, a blue LED, a sealant body, a binding material, and a lens. The base is formed by a pair of metal connecting base, a heat dissipating sink and a rectangular housing. The metal connecting base pair are arranged separately at the front and rear of the heat dissipating sink and fixed together with it by the lower part of the rectangular housing; the upper thereof surrounds the heat dissipating sink and forms a long concavity, keeping the underside of said metal connecting base and said heat dissipating sink exposed and the top of said metal connecting base pair partially exposed; the blue LED chip is arranged on said heat dissipating sink and the electrodes thereof are separately connected to the metal connecting base by conductive wires. The sealant body is filling said concavity to encapsulate the blue LED chip and conductive wires; the binding material is spread on said sealant body, and the lens is in oblong shape and adhered by said binding material, in a lateral view the top surface thereof has a first surface area on two symmetrical bulges and a second surface area on the sinking area in the middle, and the bottom thereof has a third surface area; the refractive index of said lens is less than the one of said sealant body; and the blue LED chip is located right underneath the second surface area whereby the blue lights from said blue LED chip go through the sealant body and refract through the third surface area, turning into blue rays and reaching the estimated emitting area of the first surface area, then emitting at a wide angle.
The emitting device comprises at least one wide-angle LED disclosed above, a PCB, and a lighting tube. The PCB is electrically connected to each wide-angle LED. When the device is constructed of a plurality of the wide-angle LED, there is a distance of at least 1.5 cm between each other. The lighting tube is shaped in semi-cylindrical and constructed of a thinner yellow fluorescent layer inside and a thicker color mixing layer outside, covering said wide-angle LED on said PCB; whereby the wide-angle LED emits crossing and overlapping blue rays when the PCB is connected, and the blue rays pass through the yellow fluorescent layer and turn into white light in the color mixing layer.
Furthermore, the heat dissipating sink is step-like with the blue LED chip arranged on so that it can reflect and concentrate the lights emitted from both sides of the blue LED chip, and both sides of the heat dissipating sink inclines towards the bottom at an angle between 40° and 50°; the refraction index of the sealant body is greater than 1.5, and the one of the lens is greater than 1.4. The bulging curvature of the first surface area has a pre-determined point on the third surface area as the center, and the radius of curvature can be 1.2 mm to 1.4 mm so that the blue rays would be emitted through the first surface area at an angle between 140° and 160°.
With features disclosed above, the present invention has the blue LED chip emits blue lights and refracts through the sealant body as the first optical process, and the blue lights emitted from both sides of the blue LED chip are concentrated by the heat dissipating sink and the intensity thereof is heightened. Then the concentrated blue lights refract through the lens and turn into blue rays as the secondary optical process, uniformly emitting out. The crossing and overlapping blue rays enable the extension of the distance between each wide-angle LED in the emitting device, and thus reduce the number needed for construction; together with the heightened intensity of blue rays, the present invention has features as lower prime costs and better quality.
Referring to
The base 10 is formed by a pair of metal connecting base 11, a heat dissipating sink 12 and a rectangular housing 13. The metal connecting base pair 11 are arranged separately at the front and rear of the heat dissipating sink 12 and fixed together with it by the lower part of said rectangular housing 13; the upper thereof surrounds the heat dissipating sink 12 and forms a long concavity 14, keeping the underside of the metal connecting base 11 and the heat dissipating sink 12 exposed, and the top of the metal connecting base pair 11 partially exposed.
The blue LED chip 20 is arranged on the heat dissipating sink 12 and the electrodes thereof are connected separately to the metal connecting base 11 by conductive wires 21. In this embodiment, the heat dissipating sink 12 is step-like and reflective with the blue LED chip 20 arranged on it, so that it can reflect and concentrate the lights emitted from both sides of the blue LED chip 20, heightening the light intensity. Moreover, the heat dissipating sink 12 inclines towards the bottom at an angle between 40° and 50°.
The sealant body 30 is filling said concavity 14 to encapsulate the blue LED chip 20 and conductive wires 21 as the first packaging procedure. In this embodiment, the refraction index of the sealant body 30 is greater than 1.5; the sealant body 30 has the binding material 40 spreading, and it can be made of silica gel.
The lens 50 is in oblong shape and adhered by the binding material 40 as the second packaging procedure. The length is defined as the lateral side. In a lateral view the top surface 51 thereof has a first surface area 511 on two symmetrical bulges and a second surface area 512 on the sinking area in the middle, and the bottom 52 thereof has a third surface area 521; the bulging curvature of said first surface area 511 has a pre-determined point on the third surface area 521 as the center, and the radius of curvature can be 1.2 mm to 1.4 mm so that the blue rays (L) would be emitted through the first surface area 511 at an angle between 140° to 160°. In addition, the refractive index of said lens 50 is greater than 1.4, less than the one of the sealant body 30; and the blue LED chip 20 is located right underneath the second surface area 512.
Referring to
With aforesaid structures and measures, the wide-angle LED 60 of the present invention widens the emitting angle and thus raises 15% of luminance by the secondary optics effect in which the blue lights (B) emitted from the blue LED chip 20 are concentrated upwards by the step-like heat dissipating sink 12 and the blue rays (L) are therefore intensified, and then emit in white lights (W) uniformly after going through the yellow fluorescent layer 81 and mixing in the color mixing layer 82. On the other hand, the wide-angle LED 60 was applied twice packaging procedures to avoid the sealant body 30 separating from the concavity 14, prolonging the durability of the present invention.
Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
