TW201425798A - LED bulb with a gas medium having a uniform light-distribution profile - Google Patents

Abstract

An LED bulb includes a base, a shell, and a plurality of LEDs. The shell is connected to the base and the plurality of LEDs is disposed within the shell. The LEDs are configured to provide the LED bulb with a uniform light-distribution profile.

Description

Light-emitting diode bulb with gaseous medium with uniform light distribution profile

The present application claims priority to U.S. Provisional Patent Application No. 61/681,123, filed on Aug. 8, 2012, and U.S. Provisional Patent Application No. 61/772,473, filed on Mar. The entire contents of the application are incorporated herein by reference. The present application also claims US Patent Application No. 13/588,964, filed on Aug. 17, 2012, and U.S. Patent Application Serial No. 13/842,855, filed on March 15, 2013, and on May 10, 2013 The priority of each application is incorporated herein by reference.

The present invention relates generally to light emitting diode (LED) bulbs and, more particularly, to light emitting diode bulbs with a gaseous medium having a uniform light distribution profile.

Traditionally, light using fluorescent and incandescent light bulbs has been produced. Although this type of bulb has been used reliably, it has Some shortcomings. For example, incandescent light bulbs tend to be inefficient, using only 2 to 3% of their power to produce light, while 97-98% of the remaining power is lost in the form of heat. Fluorescent bulbs, although more efficient than incandescent bulbs, do not produce the same warm light as the incandescent bulbs. In addition, there are some health and environmental problems with regard to mercury contained in conventional fluorescent bulbs.

Therefore, there is a need for an alternative light source. This alternative light source One of them is a bulb that utilizes a light-emitting diode (LED). The light emitting diode includes a semiconductor junction that emits light due to the flow of current through the junction. Compared to conventional incandescent light bulbs, light-emitting diode bulbs are capable of producing more light using the same amount of power. In addition, the operating life of a light-emitting diode bulb may be longer than the working life of an incandescent light bulb. For example, the working life of a light-emitting diode bulb is 10,000 to 100,000 hours compared to the working life of an incandescent light bulb. 1,000 to 2,000 hours.

The nature of the light produced by the light-emitting diode bulb may be It is compared to a conventional incandescent light bulb that uses a filament element to produce a relatively uniform light distribution profile. Therefore, for a light-emitting diode bulb, it would be advantageous to have a uniform light distribution profile over a major portion of the bulb surface. For example, several parts of the ENERGY STAR light distribution specification indicate that the light intensity emitted by the bulb should not be greater than the range from 0 to 135 degrees from the center of the bulb through the axis to the apex of the bulb. 20 percentage change. One of the challenges in using a light-emitting diode to make a light bulb is that, as indicated by the relevant part of the ENERGY STAR specification, the light distribution of the light-emitting diode is not uniform in nature.

The apparatus and method described herein can be used to fabricate a light-emitting two A polar light bulb whose light distribution profile has an improved uniformity of light distribution profile. In various embodiments, a light emitting diode bulb is provided to produce light uniformity in accordance with ENERGY STAR specifications for the uniformity of the light distribution profile.

An exemplary embodiment includes a light emitting diode (LED) bulb. The light emitting diode bulb includes a base and an outer casing connected to the base. A plurality of light emitting diodes are disposed within the outer casing. The first set of light emitting diodes of the plurality of light emitting diodes are positioned at a first distance relative to a center of the convex portion of the outer casing and a first angle relative to a centerline of the light emitting diode bulb. The second set of light emitting diodes of the plurality of light emitting diodes are positioned at a second distance relative to a center of the convex portion of the outer casing and a second angle relative to a centerline of the light emitting diode bulb. The light emitting diodes and the outer casing are configured to provide a projected light distribution profile of the light emitting diode bulb, the estimated light distribution profile being at 0 degrees when measured from an axis from the center of the outer casing through an axis of the outer apex of the outer casing The change in light intensity to 135 degrees is less than 20%.

In some embodiments, the positions of the first and second sets of light emitting diodes relative to the outer casing are configured to provide the projected light distribution profile of the light emitting diode bulb. In some embodiments, the first distance, the first angle, the second distance, and the second angle are configured to provide the projected light distribution profile of the LED light bulb.

In an exemplary embodiment, the first distance van It is 9 mm to 15 mm above the center of the convex portion of the outer casing, and the second distance ranges from 1 mm below the center of the convex portion of the outer casing to 6.5 mm above it. In an exemplary embodiment, the first angle ranges from 30 degrees to 40 degrees with respect to a center line of the LED bulb, and the second angle is relative to a center line of the LED bulb. The range is from -15 degrees to -20 degrees.

100‧‧‧Light Emitting Diode (LED) Bulbs

101‧‧‧ Shell

103A, 103B‧‧‧Light Emitting Diodes (LEDs)

107‧‧‧Support structure

110‧‧‧Base

111‧‧‧Closed volume

115‧‧‧ terminal block

117‧‧‧ pillar

120‧‧‧ center spool

122‧‧‧ vertex

124‧‧‧ Center

203A‧‧‧The first group of light-emitting diodes (LEDs)

203B‧‧‧Second Group of Light Emitting Diodes (LEDs)

207‧‧‧Support structure

303A‧‧‧The first group of light-emitting diodes (LEDs)

303B‧‧‧Second Group of Light Emitting Diodes (LEDs)

307‧‧‧Support structure

400‧‧‧Light Emitting Diode (LED) Bulbs

1A through 1C depict an exemplary light emitting diode (LED) bulb.

Figure 2 depicts the projected light distribution profile of a light emitting diode (LED) bulb.

3A through 3B depict an exemplary support structure for a light emitting diode (LED) bulb.

4A through 4B depict projected light distribution uniformity data for a light emitting diode (LED) bulb.

Figures 5A through 5C depict projected light distribution uniformity data for a light emitting diode (LED) bulb.

6A-6B depict an exemplary light emitting diode (LED) bulb.

Figure 7A depicts the projected light distribution profile of a light emitting diode (LED) bulb.

Figure 7B depicts the measurement of a light-emitting diode (LED) bulb Light distribution profile.

Figure 8 depicts the diffusion profile of different housing materials.

The descriptions below are presented to enable any person skilled in the art to make and use the various embodiments. Descriptions of specific devices, techniques, and applications are provided merely as examples. Various modifications to the examples described herein will be apparent to those skilled in the art, and the general principles defined herein may be applied to other examples without departing from the spirit and scope of the various embodiments. And application. Therefore, the various embodiments are not intended to be limited to the examples described and illustrated herein, but should be accorded to the scope of the application.

As mentioned earlier, the energy efficiency of a light-emitting diode (LED) provides some of its own advantages over conventional incandescent and compact fluorescent bulbs. In some embodiments, a light-emitting diode bulb can use 6 to 20 watts of electrical power to produce light equivalent to a 40 watt incandescent bulb. Luminescent diode bulbs are also generally free of mercury and other potentially hazardous materials used in conventional compact fluorescent bulbs.

One potential disadvantage of a light-emitting diode bulb is that the light distribution around the bulb itself does not match the light produced by a conventional incandescent bulb. In particular, conventional incandescent light bulbs use a heated filament to produce light that diverges, which produces a substantially uniform light intensity over a wide range of emission angles. Conversely, most commercial light-emitting diode systems function as regional light sources, and the intensity of the light they emit is approximately positive with the cosine of the emission angle. ratio. Ideally, the divergence profile of a light-emitting diode can be characterized as a Lambertian divergence profile. Therefore, the light generated by the light-emitting diode tends to be the strongest in a direction substantially perpendicular to the light-emitting region or face of the light-emitting diode. Depending in part on the relative position of the light-emitting diodes in the bulb, the light distribution of the light-emitting diode bulbs may be non-uniform and characterized by a wide range of lighter and darker regions of the divergence angle.

Thus, as discussed above, it may be desirable to produce a light emitting diode bulb having a uniform light distribution. More specifically, it may be desirable to produce a light-emitting diode bulb that conforms to the ENERGY STAR specification for the relevant portion of the light-emitting diode luminaire. Article 7A of the relevant part of the ENERGY STAR program states that qualified LED bulbs should have a uniform intensity distribution (candelas) in the range of 0 to 135 degrees (vertical axial symmetry). In the range of this region, the luminous intensity at any angle should not be different from 20% or more of the average luminous intensity of the entire region from 0 to 135 degrees.

Based on the divergence characteristics of the light-emitting diodes, not all of the light-emitting diode bulbs themselves produce a light distribution that meets the ENERGY STAR standard. The light-emitting diode bulbs and techniques described below can be used to produce a light-emitting diode bulb having a projected light distribution profile. In particular, the angle of the light emitting diodes relative to the central bulb axis may be configured to produce a light emitting diode bulb having a light distribution that meets the Energy Star standard.

1. Light-emitting diode bulb

Various embodiments relating to a light-emitting diode bulb are described as follows. As used herein, "light emitting diode bulb" refers to any light generating device (eg, a light) in which at least one of the light emitting diodes is used to generate light. Thus, as used herein, a "light emitting diode bulb" does not include a light generating device that uses a filament to generate light, such as a conventional incandescent light bulb. It will be appreciated that the light-emitting diode bulbs can have a variety of shapes other than the A-bulb-like shape of a conventional incandescent light bulb. For example, the bulb may have a cylindrical shape, a spherical shape, or the like. The light-emitting diode bulb of the present invention may also include any type of connector, such as a screw-in base, a double-pronged joint, a standard two or three-prong wall socket plug, a socket, a spiral light bulb base, and a single-pin base. , a multi-pin base, a recessed base, a flanged base, a grooved base, a side base, or the like.

FIG. 1 depicts an exemplary light emitting diode bulb 100. The LED bulb 100 includes a base 110 and a housing 101 for surrounding various components of the LED bulb 100. The outer casing 101 is coupled to the base 110 to form a closed volume 111. A column of light emitting diodes 103A-B is mounted to the support structure 107 and disposed in the enclosed volume 111. Typically, air or other gaseous medium is filled into the enclosed volume 111 between the light emitting diodes 103A-B and the interior of the outer casing 101.

In this example, the light emitting diodes 103A-B are made of a gallium nitride (GaN) semiconductor material. In addition to diverging light energy in the form of photons, the light-emitting diodes 103A-B also generate thermal energy that is dissipated in the surrounding environment. Usually, the light-emitting diodes 103A-B The operating temperature should not exceed 120 ° C to extend the life of the LEDs 103A-B. Due to these thermal limitations, the LED bulb 100 typically includes one or more components for dissipating the thermal energy generated by the LEDs 103A-B. For example, as shown in FIG. 1A, the light emitting diodes are mechanically and thermally coupled to the support structure 107. In this example, the support structure 107 is fabricated from a composite laminate that is configured to act as a heat sink and conduct heat away from the light emitting diodes 103A-B. The support structure 107 may be made of any thermally conductive material such as aluminum, copper, brass, magnesium, zinc, or the like.

As shown in FIG. 1A, the support structure 107 is attached to a post 117, which may also be made of any thermally conductive material such as aluminum, copper, brass, magnesium, zinc, or the like. The heat generated by the light-emitting diodes 103A-B can be conducted to the pillars 117 through the light-emitting diode support structure 107. In this manner, the post 117 can also serve as a heat sink or heat dissipating device for the light emitting diodes 103A-B. The light emitting diode support structure 107 and the pillars 117 may be formed in one piece or in multiple pieces. In some cases, the post 117 is also thermally coupled to the base 110, which may also serve as a heat sink.

The base 110 can include one or more components that provide structural features for mounting the bulb housing 101 and the post 117. The components of the base 110 may include, for example, a gasket, a flange, a ring, an adapter, or the like. The susceptor 110 also typically includes one or more circuits for providing power to the illuminating diodes 103A-B. The one or more circuits may be configured to convert AC power provided by a conventional light socket into A DC power source is used to drive the light emitting diodes 103A-B.

As noted above, the bulbs generally conform to standard form factors that allow for interchangeability of the bulbs between different lighting fixtures and appliances. Thus, in the present exemplary embodiment, the light emitting diode bulb 100 includes a terminal block 115 for connecting a light bulb to a lighting fixture. In one example, the terminal block 115 may be a conventional bulb base having threads for insertion into a conventional lamp socket. However, as noted above, it should be understood that the terminal block 115 can be any type of connector for mounting the light emitting diode bulb 100 or for coupling to a power source. For example, the terminal block may be screwed into the base, a double-pronged joint, a standard two or three-pronged wall socket plug, a socket, a spiral light bulb base, a single-pin base, a multi-pin base, a female base, and a convex A rim base, a grooved base, a side pedestal, or the like provides for mounting.

The light emitting diode bulb 100 depicted in Figures 1A-1C is configured to produce a light distribution profile that meets uniformity criteria. In this example, the positions of the LEDs 103A-B are configured to provide an estimated light distribution profile of the LED bulb 100 as it passes from the center 124 of the housing through the centerline axis 120 of the apex 122 of the housing. When measured, the predicted light distribution profile has a change in light intensity of less than 20% from 0 degrees to 135 degrees. More specifically, two sets of light emitting diodes 103A-B are placed at an angle within the enclosed volume to direct light toward the apex 122 and pedestal 110 of the bulb, respectively. A set of light emitting diodes 103A are arranged to surround the centerline axis 120 in a radial pattern and at an angle toward the apex 122 of the light emitting diode bulb 100. The second group of light emitting diodes 103B are arranged to surround the centerline axis 120 in a radial pattern and to face the light emitting diode bulb The angle of the base 110 of 100.

1B-1C depict the position of the LEDs 103A-B relative to other components of the LED bulb 100. 1B-1C also depict the size and relative position of other components in the LED package 100 that may or may not affect the uniformity of light distribution of the LED bulb 100. The size of the LED bulb 100 is exemplary in nature and may vary somewhat to some extent without significantly altering the uniformity of the light distribution. Examples of other light-emitting diode bulbs are provided in Figures 4A-4B, 5A-5C, and 6A-6B below.

As shown in FIGS. 1B-1C, the light-emitting diode bulb 100 includes twenty-four light-emitting diodes arranged in a radial pattern. The first group of eight light emitting diodes 103A are connected to the upper portion of the support structure 107, and the second group of sixteen light emitting diodes 103B are connected to the lower portion of the support structure 107. The first group of light emitting diodes 103A are positioned at an angle of about 35 degrees with respect to the centerline axis 120 of the light emitting diode bulb 100. The first set of light emitting diodes 103A are also positioned about 8.5 millimeters above the center 124 of the outer casing 101. The second set of light emitting diodes 103B are positioned at an angle of about -15 degrees with respect to the centerline axis 120 of the light emitting diode bulb 100. The second set of light emitting diodes 103B are also positioned about 3 mm below the center 124 of the outer casing 101.

As shown in FIG. 1B, the outer casing 101 has a constant radius of about 29.5 mm for the convex portion of the outer casing. The outer casing 101 also has a concave radius of about 31.5 millimeters for the recess of the outer casing (near the trunk of the light-emitting diode bulb). As shown in FIG. 1B, the center of the concave radius is in the The center 124 is about 30.4 mm below and about 53.5 mm from the center spool 120.

The projected light distribution profile of the LED bulb 100 shown in Figures 1A-1C is shown in Figure 2. As shown in FIG. 2, when measured from the axis passing through the center of the light-emitting diode bulb through the apex of the light-emitting diode bulb (center axis 120), the projected light distribution profile is between 0 and 135 degrees. It has a uniformity that falls within the range of +14% to -16% compared to the average light intensity. Thus, the light emitting diode bulb 100 shown in Figures 1A-1C may produce a light distribution profile that meets the ENERGY STAR uniformity criteria.

The uniformity of the light distribution may also depend on the optical properties of the outer casing 101. In general, the outer casing 101 can be made of any transparent or translucent material such as plastic, glass, polycarbonate, or the like. In some cases, it may be desirable to have a light-emitting diode bulb with a diffusing outer casing for aesthetic reasons. For example, the diffuser housing conceals or masks the internal components of the light-emitting diode bulb and gives the light-emitting diode bulb a more uniform "matte" appearance.

In this example, the outer casing 101 is made of a plastic material and has diffuse optical properties. In this example, the outer casing 101 of the light-emitting diode bulb 100 is made of a diffuse plastic material that diffuses or disperses light passing through the outer casing 101. In other embodiments, the outer casing may be made of a transparent material having a diffusing coating applied to the surface of the outer casing.

The amount of diffusion of the bulb envelope can be measured relative to the light diffusion profile Chemical. FIG. 8 depicts a light diffusing profile of different types of diffusing plastic that can be used for the outer casing 101. The bidirectional transmittance distribution function (BTDF) represents the amount of light transmitted through the plastic as a function of the transmission angle (i.e., the angle at which the transmitted light intensity is measured). For the example depicted in Figure 8, the light source (laser) has an angle of incidence of 0 degrees and the resulting light intensity is between 0 and 60 degrees (+/- 60°) on either side from another of the plastic The side is measured. Typically, the light transmission is highest at a transmission angle of approximately 0 degrees (near the angle of incidence) and decreases when the angle is swept through +/- 60 degrees. In general, a better diffusing material will disperse more light from 0 degrees than a poor diffusing material. In the examples provided herein, the diffusing envelope includes a bidirectional transmittance distribution function (BTDF) that produces greater than half of the maximum light intensity at an angle from 0 degrees (incident angle) to greater than 15 degrees and from 0 degrees to less than 60 degrees. )s material. This is exemplary in nature, and among other configurations, materials using different standards may be considered diffuse.

The light-emitting diode bulb 100 depicted in Figures 1A-1C is an example of a light-emitting diode bulb having a light-emitting diode position configured to produce a light distribution that meets the uniformity criteria. More generally, the light-emitting diode bulb 100 acts as a light-emitting diode bulb by positioning the first set of light-emitting diodes at an angle toward the apex of the bulb and positioning the angle toward the base of the bulb Two sets of light emitting diodes can be configured to produce an example of uniform light distribution.

2. Light distribution uniformity as a function of height and mounting angle of the light-emitting diode

As described in more detail below with respect to other examples, a light-emitting diode bulb may be configured such that the uniformity of light distribution is a function of the angle and height of the light-emitting diodes. As shown in the examples of Figures 4A-4B and Figures 5A-5C, these parameters can be optimized to produce a light-emitting diode bulb having an expected light distribution profile that meets the uniformity criteria. In one example, the optical properties of the outer casing (eg, thickness, refractive index, diffusion) and other characteristics (eg, size and shape) of the bulb assembly are determined or obtained. The positions of the light emitting diodes may then be determined by optimizing the vertical position (height) of the light emitting diodes relative to the outer casing to produce a light emitting diode bulb having a projected light distribution profile that meets the uniformity criteria. . In another example, the vertical position of the light-emitting diodes, the characteristics of the outer casing, and the related characteristics of the light-emitting diode bulb assembly are determined or obtained, and the angles of the light-emitting diodes are optimized to satisfy Light distribution standard.

In some cases, a computer model of the optical components of the light-emitting diode bulb is established. The computer model can be used to optimize the characteristics of the housing, the angle of the light emitting diodes, and one or more of the positions of the light emitting diodes relative to the housing.

4A-4B and 5A-5C depict optical simulation results for a plurality of light emitting diode bulb configurations established using a computer model. In each configuration, the light emitting diodes are arranged in two sets of light emitting diodes: the upper set of light emitting diodes are positioned at an angle towards the apex of the bulb, and the lower set of light emitting diodes are Positioned at an angle toward the base of the bulb. As described above, the light emitting diodes are typically mounted to a support structure configured to hold the light emitting diodes in a desired position.

3A and 3B depict two exemplary support structures 207 and 307, respectively. Each of the support structures 207, 307 is formed by cutting a laminate material into a shape having a plurality of finger projections. One or more light emitting diodes are connected to each of the finger protrusions, and the laminate material is formed into a cylindrical shape in which the light emitting diodes are arranged in a radial pattern. As shown in FIG. 3A, the laminated structure 207 includes eight upper fingers and eight lower fingers. The first group of light emitting diodes 203A are connected to the upper fingers by a light emitting diode 203A to an upper finger. The second group of light emitting diodes 203B are connected to the lower fingers by two light emitting diodes 203B to the lower fingers. As shown in FIG. 3A, the light emitting diodes 203B on the lower fingers are horizontally aligned. The arrangement illustrated in Figure 3A is for the optical simulation of Figures 4A-4B and Figures 5A-5C discussed below.

FIG. 3B depicts another exemplary support structure 307. As shown in FIG. 3B, the support structure 307 includes eight upper finger protrusions for mounting the first group of light emitting diodes 303A in such a manner that each of the fingers protrudes toward the light emitting diode 303A. The support structure 307 also includes eight lower finger projections for mounting the second set of light emitting diodes 303B. As shown in FIG. 3B, the second group of light emitting diodes 303B are vertically aligned. The two configurations depicted in Figures 3A-3B are merely exemplary in nature, and other light emitting diode arrangements may also be used.

For the simulations discussed below for Figures 4A-4B and 5A-5C, the light-emitting diodes are assumed to have a Lambertian divergence profile, and in order to establish a model of the light distribution, the Lambertian divergence profile is approximately perpendicular to the illumination The angle of the face of the diode has a peak light intensity. For made of plastic The outer shell has a refractive index assumed to be about 1.58. For an outer casing made of glass, the refractive index is assumed to be about 1.52.

For the purpose of simulation, it has been assumed that the glass envelope has a uniform thickness of 1.5 mm. Also for the purpose of simulation, the other dimensions of the simulated light-emitting diode bulb are substantially the same as the light-emitting diode bulb 100 described above with respect to Figures 1A-1C. As indicated by the axis in the figure to the right side of the table of FIGS. 4A-4B and 5A-5C, the x, y, and z positions of the light emitting diode shown in the table are relative to the convex of the outer casing. The center of the department is in millimeters. Specifically, the y-axis is aligned with the centerline axis of the light-emitting diode bulb, and the x-axis and the z-axis pass through the center of the housing.

4A-4B depict the results of a plurality of simulations showing the effect of the vertical position of the light-emitting diodes on the uniformity of the light distribution. As shown in FIGS. 4A-4B, in each simulation, the angle of the upper group of light-emitting diodes is fixed at 35 degrees, and the angle of the lower group of light-emitting diodes is fixed at -15 degrees. The vertical positions of the light-emitting diodes are varied in each of the simulated configurations, resulting in different light distribution uniformities for each configuration. As shown in Figures 4A-4B, the symbolic settings, settings 1, settings 2, and settings 4 produce a light distribution profile that meets the ENERGY STAR uniformity criteria. The settings 3 and 5 representing the two-pole values of the vertical LED position do not produce a light distribution that meets the ENERGY STAR uniformity criteria. According to the simulation results shown in Figures 4A-4B, the vertical position of the upper group of light-emitting diodes can vary between about 15 mm and 9 mm above the center of the housing. The position of the lower group of light-emitting diodes can vary between about 5 mm above the center of the housing and about 1 mm below the center of the housing. Different LED angles and/or housing geometries may Will produce different results.

Figures 5A-5C show the results of a number of simulations showing the effect of the angular position of the light-emitting diodes on the uniformity of the light distribution. As shown in Figures 5A-5C, in each simulation, the vertical position of the upper group of light-emitting diodes was fixed at 12.6 mm, and the vertical position of the lower group of light-emitting diodes was fixed at 2.9 mm. The angle of the light-emitting diodes relative to the centerline axis is varied in each of the simulated configurations, resulting in different expected light distribution uniformities for each configuration. As shown in Figures 5A-5C, the symbolic settings, settings 7, settings 9, settings 12, and settings 13 produce an estimated light distribution profile that meets the ENERGY STAR uniformity criteria. Settings 6, Setup 8, Setup 10, and Setup ll do not produce a light distribution profile that meets the ENERGY STAR uniformity criteria. According to the simulation results depicted in Figures 5A-5C, the angle of the upper group of light emitting diodes can vary between about 40 and 30 degrees relative to the centerline axis of the bulb. The angle of the lower group of light emitting diodes can vary between about -15 and -20 degrees with respect to the centerline axis of the bulb. The different vertical positions of the light-emitting diodes and/or the geometry of the outer casing may produce different results.

3. Light distribution profile of a light-emitting diode bulb that meets the uniformity standard

For the LED light bulb 400 depicted in FIGS. 6A-6B, the vertical position of the LEDs relative to the housing and the angular configuration of the LEDs relative to the centerline axis of the bulb provide The light-emitting diode bulb has a projected light distribution profile that varies less than 20 percent in light intensity from 0 degrees to 135 degrees when measured from the axis of the outer casing through the axis of the apex of the outer casing. As mentioned below In an example, the outer casing is provided with a contour shape of a convex portion and a concave portion, each of the convex portion and the concave portion having a constant radius. In other cases, the outer casing may include a convex contour shape having a varying radius, or other contour shape configured to provide a desired light distribution profile of the light emitting diode bulb.

6A-6B depict a light emitting diode bulb 400 having a diffusing plastic outer casing and twenty-four light emitting diodes arranged radially. The light emitting diodes are connected to sixteen finger projections of the support structure: eight sets of upper finger projections and eight sets of lower finger projections. As shown in Figures 6A-6B, the angle of the upper finger projection of the set is toward the apex of the bulb, and the angle of the lower finger projection of the set is toward the base of the bulb. As shown in FIG. 6B, the upper finger projection is bent at an angle of 35 degrees with respect to the center axis of the bulb, and the lower finger projection is bent at an angle of -15 degrees with respect to the center axis of the bulb. The eight upper LEDs of the first upper group are connected to the upper finger projections (each finger projection to a light emitting diode). Sixteen light emitting diodes of the second lower group are connected to the lower finger projections (each finger projection to two horizontally aligned light emitting diodes). The centers of the two light-emitting diodes on the lower finger projection are spaced apart by a distance of about 4.5 mm from the center, and the distance between the edge and the edge is about 1 mm. The first upper group of light emitting diodes is positioned about 17 mm above the center of the convex portion of the outer casing, and the second lower group of light emitting diodes is positioned about 2 mm above the center of the convex portion of the outer casing. . The light-emitting diode bulb 400 shown in Fig. 6A includes a housing having a convex radius of about 28 mm with respect to the upper convex portion of the housing. The outer casing also has a concave half of about 13 mm for the lower recess of the outer casing (near the trunk of the light-emitting diode bulb) path. As shown in Fig. 6A, the center of the concave radius is about 23.5 mm below the center of the convex radius and about 33.5 mm from the center line of the bulb.

FIG. 7A depicts the projected light distribution profile of the light emitting diode bulb 400 shown in FIGS. 6A-6B. When measured from the center of the light-emitting diode bulb 400 through the axis of the apex of the light-emitting diode bulb 400, the projected light distribution profile has a range of +15% to -17.7% between 0 and 135 degrees. Uniformity within the scope. Thus, the light emitting diode bulb 400 shown in Figures 6A-6B may produce a light distribution profile that meets the ENERGY STAR uniformity criteria.

Figures 7A-7B also depict the measured light distribution profile of an actual bulb compared to the light distribution profile of a simulated LED bulb having the same configuration. The configuration of these bulbs is described in Figures 6A-6B above. As shown in Figures 7A-7B, the measured light distribution of the actual light-emitting diode bulb corresponds to the light distribution predicted by the simulation. The measured data shows a light distribution uniformity of +10.7% to -13.8% of the simulated value (Fig. 7A) corresponding to +15% to -17.7% (Fig. 7B).

While the features may be described in a particular embodiment, those skilled in the art will appreciate that the various features of the described embodiments may be combined. Furthermore, the plurality of facing lines described in one embodiment may exist separately.

100‧‧‧Light Emitting Diode (LED) Bulbs

101‧‧‧ Shell

103A, 103B‧‧‧Light Emitting Diodes (LEDs)

107‧‧‧Support structure

110‧‧‧Base

111‧‧‧Closed volume

115‧‧‧ terminal block

117‧‧‧ pillar

120‧‧‧ center spool

122‧‧‧ vertex

124‧‧‧ Center

Claims (20)

A light-emitting diode (LED) bulb comprising: a base; a housing connected to the base; and a plurality of light-emitting diodes disposed in the housing, wherein: the first group of the plurality of light-emitting diodes The pole body is positioned at a first distance relative to a center of the convex portion of the outer casing and a first angle relative to a center line of the light emitting diode bulb, and the second group of the light emitting diodes in the plurality of light emitting diodes Positioning at a second distance relative to a center of the protrusion of the housing and a second angle relative to the centerline of the LED bulb, and the first and second sets of LED configurations are provided An estimated light distribution profile, the measured light distribution profile changes from less than 20 percent of light intensity from 0 degrees to 135 degrees when measured from the axis of the outer casing through the axis of the apex of the outer casing. The light-emitting diode bulb of claim 1, wherein the positions of the first and second groups of light-emitting diodes relative to the outer casing are configured to provide the projected light distribution profile of the light-emitting diode bulb. The light-emitting diode bulb of claim 1, wherein the first distance, the first angle, the second distance, and the second angle are configured to provide the projected light distribution profile of the light-emitting diode bulb. The light-emitting diode bulb of claim 1, wherein when the light-emitting diode lamp operates, light emitted from the plurality of light-emitting diodes passes through a gaseous medium before passing through the outer casing. The light-emitting diode bulb of claim 1, wherein the first distance ranges from 9 mm to 15 mm above the center of the convex portion of the outer casing, and the second distance ranges from the convex portion 1 mm below the center to 6.5 mm above it. The light-emitting diode bulb of claim 1, wherein the first angle ranges from 30 degrees to 40 degrees with respect to a center line of the light-emitting diode bulb, and is opposite to a center of the light-emitting diode bulb The second angle ranges from -15 degrees to -20 degrees. The light-emitting diode bulb of claim 1, wherein the plurality of light-emitting diodes are positioned to be radially arranged around an axis from the center of the outer casing through an apex of the outer casing, the radial arrangement having about 31 The diameter of the millimeter. The light-emitting diode bulb of claim 1, wherein the outer casing is made of a transparent material that does not disperse light emitted by the plurality of light-emitting diodes. The light-emitting diode bulb of claim 1, wherein the outer casing is made of a diffusing material configured to disperse light emitted by the plurality of light-emitting diodes. The light-emitting diode bulb of claim 1, wherein the outer casing comprises a diffusive coating configured to disperse light emitted by the plurality of light-emitting diodes. The light-emitting diode bulb of claim 1, wherein the diffusing material has a bidirectional transmittance distribution function (BTDF) for vertical The light incident on the surface is greater than half the maximum light intensity at an angle greater than 15 degrees from the angle of incidence and less than 60 degrees from the angle of incidence. The light-emitting diode bulb of claim 1, wherein the second group of light-emitting diodes of the plurality of light-emitting diodes comprises a plurality of pairs of light-emitting diodes that are horizontally aligned. The light-emitting diode bulb of claim 1, wherein the second group of light-emitting diodes of the plurality of light-emitting diodes comprise a plurality of pairs of vertically aligned light-emitting diodes. The light-emitting diode bulb of claim 1, further comprising: a support structure disposed in the outer casing, the support structure having a first set of upper finger protrusions and a second set of lower finger protrusions; wherein the first A group of light emitting diode systems is coupled to the first set of finger projections, and the second group of light emitting diode systems are coupled to the second group of lower finger projections. The light-emitting diode bulb of claim 14, wherein the support structure is made of a sheet of a laminated material formed into a cylindrical shape. The light-emitting diode bulb of claim 14, wherein the support structure is made of a sheet of laminated material and is cut to form the first set of upper finger projections and the second group A contoured shape of the fingers, wherein the first set of upper finger projections and the second set of lower finger projections are bent at an angle, and the laminate material is formed into a cylindrical shape. Such as the light-emitting diode bulb of claim 14 of the patent scope, The utility model comprises: a pillar disposed in the outer casing, wherein the pillar is substantially aligned with a center line of the light-emitting diode bulb, and the supporting structure is fixed to the pillar. A light-emitting diode (LED) bulb comprising: a base; an outer casing connected to the base; and a plurality of light-emitting diodes disposed in the outer casing; a gaseous medium disposed on the plurality of light-emitting diodes and the outer casing And wherein the first group of the LEDs in the plurality of LEDs are at a first distance relative to a center of the protrusion of the housing and a first angle relative to a center line of the LED bulb Positioning, the second group of the LEDs in the plurality of LEDs are at a second distance relative to a center of the protrusion of the housing and a second angle relative to the centerline of the LED bulb Positioning, and the first and second sets of light emitting diode configurations are configured to provide an estimated light distribution profile of the light emitting diode bulb, the projected light distribution when measured from an axis from the center of the outer casing through an axis of the apex of the outer casing The change in light intensity of the profile from 0 to 135 degrees is less than 20 percent. A method of manufacturing a light emitting diode (LED) bulb, the method comprising: obtaining a susceptor; attaching a housing to the pedestal; and placing a plurality of illuminating diodes into the housing, wherein: The first group of light emitting diodes of the plurality of light emitting diodes are positioned at a first distance relative to a center of the convex portion of the outer casing and a first angle relative to a center line of the light emitting diode bulb, the plural The second group of light emitting diodes in the light emitting diode are positioned at a second distance relative to a center of the convex portion of the outer casing and a second angle relative to the center line of the light emitting diode bulb, and The first and second sets of light emitting diodes and the outer casing are configured to provide an estimated light distribution profile of the light emitting diode bulb, the projected light distribution when measured from an axis from the center of the outer casing through an axis of the apex of the outer casing The change in light intensity of the profile from 0 to 135 degrees is less than 20 percent. A method of manufacturing a light-emitting diode (LED) bulb having a light distribution profile meeting a uniformity standard, the method comprising: obtaining a susceptor; obtaining a housing having a refractive index; and calculating a complex illuminating ray according to the refractive index of the housing a first distance and a first angle of the first group of light-emitting diodes in the polar body, and calculating a second distance and a second distance of the second group of the light-emitting diodes in the plurality of light-emitting diodes according to the refractive index of the outer casing An angle, wherein the first distance, the first angle, the second distance, and the second angle result in a projected light distribution profile that is measured when measured from an axis from a center of the outer casing through an apex of the outer casing The variation of the light intensity of the distribution profile from 0 degrees to 135 degrees is less than 20%; and the first group of light-emitting diodes are positioned within the casing at the first angle and the first distance; Positioning the second set of light emitting diodes within the housing at the second angle and the second distance; and attaching the housing to the base.