JP2012164541A - Straight-tube type led electric bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive straight-tube type LED electric bulb having a sufficiently wide irradiation angle and excellent in heat radiation and impact-resistant performance.SOLUTION: The straight-tube type LED electric bulb shown as an embodiment 1 includes a plurality of first LED light sources 0101a, and a plurality of second LED light sources 0101b, and their optical axes 0105a, 0105b have respective predetermined angles 0106. Two lines expanded from the respective LED light sources to both sides with light axes of the respective LED light sources as a center show an image of a zone illuminated with the respective LED light sources. Thus, the sufficiently wide irradiation angle 0130 can be secured with the LED light sources having strong irradiation directivity of light, by giving the predetermined angles to these two LED light sources.

Description

  The present invention relates to a technique for providing a straight tube type LED bulb having a sufficiently wide irradiation angle and excellent in heat dissipation and impact resistance.

  LED bulbs using light emitting diodes (hereinafter referred to as LEDs) are expected to replace incandescent bulbs and fluorescent lamps because of their excellent energy efficiency and long life. In fact, incandescent bulb type LED bulbs have been rapidly replaced with incandescent bulbs due to recent price reductions.

  On the other hand, the straight tube type LED bulb expected to replace the straight tube type fluorescent lamp is delayed in its use compared with the incandescent bulb type LED bulb because of some obstacles. One reason is the irradiation angle of the straight tube type LED bulb. In other words, the straight tube fluorescent lamps frequently used in offices and the like can illuminate the entire range of 360 degrees, whereas the LED light source has strong directivity, so the straight tube LED bulbs illuminate all directions. There was a problem that the ceiling was dark. Therefore, a technique for evenly illuminating a wide range by disposing a plurality of LED light sources so that their irradiation axes have angles has been disclosed (Patent Documents 1 and 2).

JP 2005-166426 A JP 2010-257769 A

  Another reason that the spread of straight tube type LED bulbs does not progress is that the price has not yet been realized until sufficient economic rationality is obtained when compared with a straight tube type fluorescent lamp. The straight tube LED bulbs described in Patent Document 1 and Patent Document 2 employ a complicated structure for obtaining wide-angle illumination, and it is difficult to realize a low price of the straight tube LED bulb. There are still challenges.

  The straight tube type LED bulb of the present invention is a straight tube type LED bulb that realizes a wide-angle irradiation angle, heat dissipation, and impact resistance performance with a simple structure.

  One invention of this application is related with the straight tube | pipe type LED light bulb which installed two board | substrates with which several LED light sources were installed so that they might have a fixed angle.

  One invention of this application is related with the straight tube | pipe type LED light bulb which bent and installed the flexible substrate in which the some LED light source was installed.

  According to the present invention, a straight tube type LED bulb having a sufficiently wide irradiation angle and excellent in heat dissipation and impact resistance is provided.

The figure showing the concept of the straight tube | pipe type LED bulb of Example 1. FIG. The figure showing the structure of the straight tube | pipe type LED bulb of Example 1. FIG. The figure for demonstrating the term of "cross-section irradiation vector" of a LED light source. The figure showing the concept of the straight tube | pipe type LED bulb of Example 2. FIG. The figure showing the structure of the straight tube | pipe type LED bulb of Example 2. FIG. Sectional drawing of the straight tube | pipe type LED bulb of Example 3. FIG. Sectional drawing of the straight tube | pipe type LED bulb of Example 3. FIG. Sectional drawing of the straight tube | pipe type LED bulb of Example 4. FIG. Sectional drawing of the straight tube | pipe type LED bulb of Example 4. FIG.

  The first embodiment relates to the invention described in claim 1 and claim 2. The second embodiment relates to the invention described in claims 3, 4, and 5. The third embodiment relates to the invention described in claims 6 and 7. Example 4 relates to the invention described in claim 8.

<Concept of Example 1>

  FIG. 1 is a diagram illustrating the concept of a straight tube LED bulb according to the first embodiment. The figure is a cross-sectional view of a straight tube type LED bulb cut along a plane perpendicular to the direction in which the tube extends. The straight tube type LED light bulb of Example 1 includes a plurality of first LED light sources 0101a and a plurality of second LED light sources 0101b (since a plurality of LED light sources are arranged vertically in the drawing, , Only one LED bulb appears for each of the first LED light source and the second LED light source), and the cross-section irradiation vectors 0105a and 0105b in which the light travels in the cross-section have a predetermined angle 0106 (The exact definition of the cross-section irradiation vector will be described later). Two lines extending from each LED light source to both sides with the cross-section illumination vector in the middle are images of the range illuminated by the LED light source. In this way, by providing the two LED light sources with a predetermined angle, it is possible to ensure a sufficiently wide irradiation angle 0130 even with an LED light source with strong light directivity.

The straight tube type LED light bulb of Example 1 has a heat radiating portion 0103 in the upper part, and can efficiently release the heat generated by the LED light source to the outside, and a substrate protection protrusion 0109 is formed in the center of the lower part. The substrate on which the LED light source is installed is protected from an impact caused by dropping or colliding.
<Configuration of Example 1>

  FIG. 2 is a diagram illustrating the structure of the straight tube type LED bulb according to the first embodiment. The figure shows a cut surface obtained by cutting a straight tube type LED bulb along a plane perpendicular to the direction in which the tube extends (hereinafter referred to as “cut surface”, a plane perpendicular to the direction in which the tube of the straight tube type LED bulb extends) ). The straight tube type LED light bulb of Example 1 has a first thermally conductive support 0210 for forming a skeleton and supporting a substrate on which the LED light source is installed and for radiating the heat of the LED light source. A heat radiation part 0203 for heat radiation is formed on the upper part of the first thermally conductive support, and a first substrate installation part 0204 for substrate installation is formed on the lower part. Further, a substrate protection protrusion 0209 for protecting the substrate is formed at the lower center of the first thermally conductive support. Installation surfaces 0208a and 0208b for installing a substrate are formed on both sides of the substrate protection protrusion 0209, and a first substrate 0202a and a second substrate 0202b are installed on each of the installation surfaces. A plurality of first LED light sources 0201a are installed on the first substrate, and a plurality of second LED light sources 0201b are installed on the second substrate. The first substrate placement part is centered so that the cross-sectional irradiation vector 0205a of the first LED light source and the cross-sectional irradiation vector 0205b of the second LED light source form a predetermined angle 0206 and the central part is positioned at the lower part. The part is bent.

  The “first thermally conductive support” is a main body that forms the skeleton of the straight-tube LED bulb of Example 1, and supports and protects the substrate on which the LED light source is installed. It plays the role of releasing the generated heat to the outside. Since deterioration of the LED light source is accelerated by a high temperature, heat dissipation is important for extending the life of the LED light source. For this reason, it is preferable to use a material having a high thermal conductivity such as an aluminum alloy as the material of the first thermal conductive support. As a method of forming the shape shown in the figure, drawing or the like can be adopted.

  “Tubular” refers to the state of an elongated hollow bar. The reason for making it hollow is to reduce weight and material costs while maintaining a certain strength. You may provide the partition in order to improve an intensity | strength and heat conductivity in the hollow of a cross section.

  The “heat dissipating part” preferably has a sufficient area to be exposed to the outside air.

  In addition to the LED light source, the “first substrate” and the “second substrate” are provided with necessary wiring, a control / power supply circuit for controlling the light output of the LED light source, and the like.

  The method of installing the first substrate and the second substrate on the first substrate installation part may be hooked with L-shaped claws formed at both ends of the installation surface as shown in FIG. 2, or fixed with screws or the like. May be. The advantage of hooking with an L-shaped claw as shown in FIG. 2 is that the substrate can be easily installed and can be easily replaced when the substrate is damaged.

  An “LED light source” is a light emitting diode. The color of light does not matter. For the purpose of substituting for a fluorescent lamp, it is preferable to use white, daylight color, daylight white, light bulb color, or the like. A plurality of LED light sources are installed on each of the first substrate and the second substrate. In the example of FIG. 2, the plurality of LED light sources are arranged vertically to the cut surface, only one LED light source installed on the cut surface is drawn, and the LED light sources before and after that are not drawn. Of course, you may install an LED light source so that two or more may exist in the same cut surface.

  The LED light source may or may not be installed on the substrate so that the direction of light irradiation is the same as the normal of the substrate surface. The plurality of LED light sources may be installed so that the irradiation of light by them is all directed in the same direction or in different directions. It may be possible to illuminate a wide range evenly by installing it in different directions.

  FIG. 3 is a diagram for explaining the term “cross-section irradiation vector” of the LED light source. In the drawing, a cross section 0300 of a straight tube type LED bulb is drawn, and a plane 0330 is a plane including this cross section. The plane A is perpendicular to the direction in which the tube of the straight tube type LED bulb extends. The first LED light source A (0301a) and the second LED light source A ′ (0301b) are on the plane A, and the vector AB represents the direction in which the light from the first LED light source is most strongly directed. The point C exists on the plane A, and the vector BC is a normal vector perpendicular to the plane A. At this time, the vector AC is defined as the “cross-section irradiation vector” of the first LED light source A. Similarly, the vector A′B ′ represents the direction in which the light from the second LED light source is most strongly directed. The point C ′ exists on the plane A, and the vector B′C ′ is a normal vector perpendicular to the plane A. At this time, the vector A′C ′ is defined as the “cross-section irradiation vector” of the second LED light source A ′.

  For each of the first LED light source and the second LED light source, when all of the plurality of LED light sources have cross-sectional illumination vectors in the same direction, there is no problem with the above definition. As described above, there is a case where a wide area can be illuminated uniformly by dispersing the irradiation directions of a plurality of LED light sources. In this case, the cross-section irradiation vector is different for each LED light source. Therefore, the cross-section irradiation vector of the first LED light source can be redefined as an average vector of a plurality of cross-section irradiation vectors of the first LED light source, that is, a composite vector thereof. When synthesizing cross-sectional illumination vectors for LED light sources with different luminances, they may be combined as vectors having the same size, or a vector having a size proportional to the luminance is synthesized for each LED light source. May be.

  The central portion of the “first substrate installation portion” is bent. The condition when bending is that firstly, the cross-sectional irradiation vector of the first LED light source and the cross-sectional irradiation vector of the second LED light source form a predetermined angle. The central part is located in the lower part.

  The section illumination vector of the first LED light source and the section illumination vector of the second LED light source form a predetermined angle. In FIG. 3, an angle 0340 formed by the vector AC and the vector A′C ′ is a predetermined angle. It is to make.

  “Predetermined angle” refers to 30 to 90 degrees, preferably 45 to 75 degrees. Most preferably, it means 60 degrees.

  “The central part is located at the lower part” means that the central part is convex downward.

  A substrate protecting projection for protecting the substrate is provided at the center of the first substrate installing portion. This is to protect the substrate when the straight tube type LED bulb falls or when an object hits it. As shown in FIG. 2, the substrate protection protrusions of the second embodiment are formed so as to protrude from both sides like a claw so that the substrate can be latched. In addition, L-shaped claws 0211a and 0211b are formed on the opposite side of the substrate installation surface across the substrate so as to latch the opposite side of the substrate. The substrate protection protrusion and the L-shaped claw serve to protect the substrate from both sides. The substrate protection protrusion and the L-shaped claw are preferably formed to be higher than the LED light source with respect to the substrate installation surface. By doing so, it becomes possible to protect the LED light source more safely.

  The impact applied to the substrate protection protrusion when the straight tube type LED bulb falls or an object collides with it is dispersed and transmitted to the heat dissipation portion via both sides of the first substrate installation portion. Thereby, the impact at the time of dropping or collision is reduced, and there is an effect of suppressing damage to the substrate.

  The substrate protection protrusions and the L-shaped claws do not have to be formed on the entire cross section of the first thermal conductive support, and may be formed intermittently.

The length of the tube of the straight tube type LED bulb is not limited. Further, whether or not both ends of the straight tube type LED bulb are plugs such as a straight tube type fluorescent lamp is also arbitrary. If you want to reuse the existing lighting equipment for straight tube fluorescent lamps, the length should match the standard of conventional straight tube fluorescent lamps, and both ends can be plugged into the conventional straight tube fluorescent lamp socket Use a suitable plug. However, it should be noted that using a conventional lighting device for a straight tube fluorescent lamp may require a certain amount of electrical work such as removing a ballast.
<Effect of Example 1>

  According to the first embodiment, a straight tube type LED bulb having a sufficiently wide irradiation angle and excellent in heat dissipation and impact resistance is provided.

<Concept of Example 2>

  FIG. 4 is a diagram illustrating the concept of the straight tube type LED bulb according to the second embodiment. The figure shows a cut surface of a straight tube type LED bulb. The straight tube type LED light bulb of the second embodiment includes a plurality of third LED light sources 0401a and a plurality of fourth LED light sources 0401b, and their cross-section irradiation vectors 0405a and 0405b have a predetermined angle 0406. Two lines extending from each LED light source to both sides with the cross-section illumination vector in the middle are images of the range illuminated by the LED light source. Thus, by providing a predetermined angle between the irradiation axes of the two LED light sources, it is possible to ensure a sufficiently wide irradiation angle 0430 even with an LED light source having a strong directivity of light irradiation.

The straight tube type LED light bulb of Example 2 has a heat radiating portion 0403 in the upper part, and can efficiently radiate heat generated by the LED light source.
<Configuration of Example 2>

  FIG. 5 is a diagram illustrating the structure of a straight tube type LED bulb according to the second embodiment. The figure represents a cut surface of a straight tube type LED bulb. The straight tube type LED light bulb of Example 2 has a second thermally conductive support body 0510 for supporting the flexible substrate 0502 as a skeleton and for radiating the heat of the LED light source. A heat radiation part 0503 for heat radiation is formed on the upper part of the first thermally conductive support, and a second substrate installation part 0504 for flexible substrate installation is formed on the lower part. A curved substrate installation surface 0508 for installing the flexible substrate in a curved state is formed in the second substrate installation portion. The flexible substrate is provided with a plurality of third LED light sources 0501a and a plurality of fourth LED light sources 0501b on both sides of the center line 0509. The cross-sectional irradiation vector 0505a of the third LED light source and the cross-sectional irradiation vector 0505b of the fourth LED light source form a predetermined angle 0506.

  The “second heat conductive support” is a main body that forms the skeleton of the straight tube type LED light bulb of Example 2, and supports the flexible substrate on which the LED light source is installed, and heat generated from the LED light source to the outside. To play a role. As the material, it is preferable to use a material having high thermal conductivity such as an aluminum alloy.

  “Tubular” refers to the state of an elongated hollow bar. In FIG. 3, a partition 0511 is provided in the hollow of the cross section to increase strength and thermal conductivity, but this is not essential.

  A “flexible substrate” is a substrate that is flexible and does not break even if it is curved to some extent. In addition to the LED light source, the flexible substrate is provided with necessary wiring, a control / power supply circuit for controlling the light output of the LED light source, and the like.

  As a method of installing the flexible substrate on the second substrate installation section, it may be hooked with L-shaped claws formed at both ends of the installation surface as shown in FIG. 5, or may be fixed with screws or the like. The advantage of hooking with an L-shaped claw as shown in FIG. 5 is that the substrate can be easily installed and can be easily replaced when the substrate is damaged.

  The “LED light source” is the same as that described in the first embodiment. A plurality of LED light sources are installed on both sides of the center line of the flexible substrate. In the example of FIG. 5, the plurality of LED light sources are arranged side by side in a direction perpendicular to the cut surface, and only one LED light source installed on the cut surface is drawn. Of course, you may install an LED light source so that two or more may exist on the one side of the same cut surface.

  The LED light source may or may not be installed on the substrate so that the direction of light irradiation is in the same direction as the normal of the flexible substrate in a state where the light is not curved. The plurality of LED light sources may be installed so that the irradiation of light by them is all directed in the same direction or in different directions. It may be possible to illuminate a wide range evenly by installing it in different directions.

  The meanings of “LED cross-section irradiation vector” and “predetermined angle” are the same as in the first embodiment.

  The board installation surface of the “second board installation unit” is installed with the flexible board curved so that the cross-section irradiation vector of the third LED light source and the cross-section irradiation vector of the fourth LED light source form a predetermined angle. It is formed so that it can be bent. The cross-sectional irradiation vector of the third LED light source and the cross-sectional irradiation vector of the fourth LED light source form a predetermined angle as in the case described with reference to FIG.

The length of the tube and the structure of both ends of the straight tube type LED bulb of the second embodiment are the same as those described in the first embodiment.
<Effect of Example 2>

  According to Example 2, a straight tube type LED bulb having a sufficiently wide irradiation angle and excellent in heat dissipation is provided.

<Concept of Example 3>

6 and 7 are cross-sectional views of the straight tube type LED bulb of the third embodiment. In the straight tube type LED bulbs of Example 1 and Example 2, the LED light source was exposed to the outside. The straight tube type LED light bulb of Example 3 has translucent covers 0620 and 0720 that protect the LED light sources 0601 and 0701.
<Configuration of Example 3>

  The straight tube type LED bulb of Example 3 has a translucent cover. The other parts are the same except for the attachment part of the translucent cover. Below, a translucent cover and its attachment method are demonstrated.

  Since the light-transmitting cover sufficiently transmits the light emitted from the LED light source, a transparent material such as transparent plastic or glass is used. Although it may be completely colorless and transparent, it is possible to express the quality of a fluorescent lamp by making the inner substrate invisible as white transparent such as frosted glass. In addition, by adopting a material that diffuses light, it becomes possible to illuminate the light irradiation range from the straight tube type LED bulb more evenly and uniformly. Furthermore, it becomes possible to protect an LED light source and a board | substrate more safely by a translucent cover.

  The translucent cover is formed by cutting out a part of the outer circumference of the circle as shown in FIG. 6 or FIG. 7, and the first heat conductive support or the second heat conductive support (hereinafter referred to as the heat conductive support together). If it is connected to both ends of the heat-dissipating part of the body) and the light-transmitting cover and heat-dissipating part are combined to form a single circle, it represents a straight tube fluorescent lamp, and the heat-dissipating part is external It can be exposed.

As shown in FIG. 6 or FIG. 7, the method of fixing the translucent cover to the heat conductive support is such that the protrusions formed at both ends of the translucent cover are fitted into the grooves formed at both ends of the heat radiating portion. Or, conversely, the protrusions formed on the heat conductive support may be fitted and connected to the grooves formed at both ends of the translucent cover, or It is good also as fixing with a screw etc.
<Effect of Example 3>

  According to the third embodiment, there is provided a straight tube type LED light bulb having an appearance like a straight tube type fluorescent lamp, an LED light source being more safely protected, and capable of illuminating a wide area.

<Concept of Example 4>

8 and 9 are cross-sectional views of a straight tube type LED bulb of Example 4. FIG. In the straight tube type LED bulb of Example 4, the heat dissipating portions 0803 and 0903 have heat dissipating fins 0840 and 0940. Dissipation efficiency is improved by providing heat dissipation fins in the heat dissipation portion.
<Configuration of Example 4>

The heat dissipating fins may be integrally formed with the heat conductive support, or may be separately formed and screwed or bonded. The heat dissipating fin is preferably made of a material having high heat conductivity such as an aluminum alloy like the heat conductive support and has a length that can secure a sufficiently wide heat dissipating surface. However, it should be noted that the heat dissipating fin is located at the top of the straight tube type LED bulb and is difficult to see from the bottom, but if it is too large, the appearance of the straight tube fluorescent lamp is impaired.
<Effect of Example 4>

  According to the fourth embodiment, a straight tube type LED light bulb having more excellent heat dissipation is provided.

0101a First LED light source 0101b Second LED light source 0103 Radiation unit 0105a Cross-section irradiation vector 0105b Cross-section irradiation vector 0106 Predetermined angle 0109 Substrate protection projection 0130 Irradiation angle

Claims (8)

A first substrate on which a plurality of first LED light sources are installed;
A second substrate on which a plurality of second LED light sources are installed;
A tubular first thermally conductive support that supports the first substrate and the second substrate;
A straight tube type LED bulb having
The first thermally conductive support has a heat radiating portion for radiating heat, and a first substrate setting portion for setting the first substrate and the second substrate,
The first substrate placement unit has a central portion such that a cross-sectional irradiation vector of the first LED light source and a cross-sectional irradiation vector of the second LED light source form a predetermined angle and the central portion is positioned at a lower portion. The straight pipe type is characterized in that an installation surface for installing the first substrate and the second substrate is formed on both sides thereof, and a substrate protection projection for protecting the substrate is provided in the central portion. LED bulb. The straight tube type LED light bulb according to claim 1, wherein the cross-sectional irradiation vector of the first LED light source and the cross-sectional irradiation vector of the second LED light source form an angle of 30 degrees to 90 degrees. A plurality of third LED light sources, a plurality of fourth LED light sources, and a flexible substrate installed on both sides across the center line;
A tubular second thermally conductive support for supporting the flexible substrate;
A straight tube type LED bulb having
The second thermally conductive support has a heat radiating part for radiating heat, and a second substrate installing part for installing the flexible substrate,
The straight tube type LED light bulb characterized in that the second substrate installation portion has a substrate installation surface curved so as to be installed by bending the flexible substrate. The straight tube type LED light bulb according to claim 3, wherein the cross-section irradiation vector of the third LED light source and the cross-section irradiation vector of the fourth LED light source form an angle of 30 degrees to 90 degrees. The straight tube type LED light bulb according to claim 3 or 4, wherein the flexible substrate is hooked by two L-shaped claws provided at both ends of the second substrate installation portion.   The straight tube type LED light bulb according to any one of claims 1 to 5, further comprising a translucent cover for protecting the LED light source. The straight tube type LED light bulb according to claim 6, wherein protrusions formed at both ends of the translucent cover are fitted into and connected to grooves formed at both ends of the heat radiating portion. The straight tube type LED light bulb according to any one of claims 1 to 7, wherein the heat dissipating part is provided with heat dissipating fins.

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