JP2016042478A - LED bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED bulb capable of illuminating a wider range.SOLUTION: An LED bulb comprises: an LED light-emitting section 200 having one or more LED chips; a base 300 having a mounting surface 321 on which the LED light-emitting section 200 is mounted; and a globe 500 covering the LED light-emitting section 200 and transmitting light, the globe 500 bulging to one side that is a front side of the mounting surface 321 in the x-direction, having an apex 504 on an end on one side in the x-direction, and being provided with a light reflection surface 512 that is disposed to surround a central axis O1 extending from the base 300 to the apex 504 along the x-direction and that is displaced to one side in the x-direction as is away from the central axis O1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED bulb including an LED chip as a light source.

  As an alternative to so-called incandescent bulbs, LED bulbs mounted with LED chips are beginning to spread. LED bulbs have advantages such as power saving and long life over incandescent bulbs.

  FIG. 19 shows an example of a conventional LED bulb (see, for example, Patent Document 1). The LED bulb 900 shown in the figure is configured to be used as an alternative to an incandescent bulb, and includes an LED substrate 901, a plurality of LED chips 902, a base 903, a power supply unit 904, a base 905, and a globe 906. It has. The plurality of LED chips 902 are light sources of the LED bulb 900 and are mounted on the LED substrate 901. The LED substrate 901 is made of an insulating material and is fixed to the base 903. The base 903 is made of a metal such as aluminum, for example, and plays a role of dissipating heat from the plurality of LED chips 902 to the outside. The base 905 is a part for attaching the LED bulb 900 to a lighting fixture or the like, and has a specification defined in the JIS standard, for example. The globe 906 protects the plurality of LED chips 902 and transmits light from the LED chips 902.

  Since the light emitted from the LED chip 902 has a relatively high directivity, the luminance is the highest in the upper part of the figure and is relatively low in the side. Furthermore, it is difficult for light from the LED chip 902 to reach obliquely below in the drawing. For this reason, when the LED bulb 900 is used in place of a general incandescent bulb and attached to a lighting fixture, there is a problem that a bright range that is sufficiently illuminated and a dark range that is not sufficiently illuminated are generated.

JP 2010-225409 A

  The present invention has been conceived under the above circumstances, and an object thereof is to provide an LED bulb capable of illuminating a wider range.

  An LED bulb provided by the present invention includes an LED light emitting unit having one or more LED chips, a support unit having a mounting surface on which the LED light emitting unit is mounted, and a globe that covers the LED light emitting unit and transmits light. And the globe bulges on one side in the first direction, which is the front side of the mounting surface, and has a vertex at one end in the first direction, A light reflection surface is provided so as to surround a central axis along the first direction extending from the support portion to the apex, and is displaced to one side in the first direction as the distance from the central axis increases. Yes.

  In a preferred embodiment of the present invention, the globe further includes a light transmission surface that intersects the central axis and is surrounded by the light reflection surface, and transmits light from the LED light emitting unit. Is provided.

  In a preferred embodiment of the present invention, the light transmission surface intersects the central axis at a right angle.

  In a preferred embodiment of the present invention, the light reflecting surface has a rotationally symmetric shape with the central axis as a rotationally symmetric axis.

  In a preferred embodiment of the present invention, the light reflecting surface has a concave arc shape in a cross section including the central axis.

  In a preferred embodiment of the present invention, the glove is positioned on the one side in the first direction with respect to the first part, and on the other side in the first direction with respect to the first part. A second portion including a portion having a thickness smaller than the thickness of the second portion.

  In a preferred embodiment of the present invention, the second portion has a concavo-convex portion including a concave portion and a convex portion, and the concave portion constitutes a portion having the small thickness.

  In a preferred embodiment of the present invention, the concave portion and the convex portion are each formed in an annular shape centering on the central axis, and are alternately arranged in the first direction.

  In preferable embodiment of this invention, the said uneven | corrugated shaped part is located inside the said globe.

  In a preferred embodiment of the present invention, the globe contains a light diffusing agent.

  In a preferred embodiment of the present invention, the globe includes a high-concentration light diffusing portion having a relatively high content concentration of the light diffusing agent, and a low-concentration light diffusing portion having a relatively low content concentration of the light diffusing agent. Have.

  In a preferred embodiment of the present invention, the high-concentration light diffusion portion is located on one side in the first direction, and the low-concentration light diffusion portion is the other in the first direction with respect to the high-concentration light diffusion portion. Located on the side.

  In a preferred embodiment of the present invention, each of the gloves extends from the other side in the first direction to the one side in the first direction, and is alternately arranged around the central axis in the first direction view. There are a plurality of first and second belt-like portions, and each of the first and second belt-like portions constitutes the high-concentration light diffusion portion and the low-concentration light diffusion portion, respectively.

  In a preferred embodiment of the present invention, the glove has a dome-shaped portion with the apex at the top, and a constricted portion that is connected to the support portion side with respect to the dome-shaped portion and narrows toward the support portion. And having.

  In a preferred embodiment of the present invention, the dome-shaped portion has a first portion, and the constricted portion includes a second portion including a portion whose thickness is smaller than the thickness of the first portion. Have.

  In a preferred embodiment of the present invention, the second portion has a concavo-convex portion including a concave portion and a convex portion, and the concave portion constitutes a portion having the small thickness.

  In a preferred embodiment of the present invention, the concave portion and the convex portion are each formed in an annular shape centering on the central axis, and are alternately arranged in the first direction.

In preferable embodiment of this invention, the said uneven | corrugated shaped part is located inside the said globe.

  In a preferred embodiment of the present invention, the globe contains a light diffusing agent.

  In a preferred embodiment of the present invention, the dome-shaped part has a high-concentration light diffusing part having a relatively high concentration of the light diffusing agent, and the constricted part has a concentration of the light diffusing agent. Has a relatively low low-density light diffusion portion.

  In a preferred embodiment of the present invention, a boundary portion between the dome-shaped portion and the narrowed portion is a maximum outer shape portion having a maximum dimension perpendicular to the first direction.

  In preferable embodiment of this invention, the said LED light emission part is attached to the said support part, and has an LED substrate with which the said several LED chip was mounted.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a front view which shows the LED light bulb based on 1st Embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which shows the LED light emission part of the LED bulb of FIG. It is a top view which shows arrangement | positioning of the LED light emission part of the LED bulb of FIG. It is sectional drawing showing the cross section similar to FIG. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 2nd Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 3rd Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 4th Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 5th Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 6th Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 7th Embodiment of this invention. It is sectional drawing similar to FIG. 2 which shows the LED bulb based on 8th Embodiment of this invention. It is a front view which shows the LED light bulb based on 9th Embodiment of this invention. It is sectional drawing which follows the XIV-XIV line | wire of FIG. It is a front view which shows the LED light bulb based on 10th Embodiment of this invention. It is sectional drawing which follows the XVI-XVI line | wire of FIG. It is sectional drawing which shows the LED module of the LED bulb of FIG. It is a top view which shows arrangement | positioning of the LED module of the LED bulb of FIG. It is sectional drawing which shows an example of the conventional LED bulb.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 and 2 show an LED bulb according to a first embodiment of the present invention. The LED bulb 101 of this embodiment includes an LED light emitting unit 200, a base 300, a power supply unit 400, a globe 500, and a base 600. The LED bulb 101 is used by being attached to a lighting fixture for an incandescent bulb as an alternative product to the incandescent bulb. The LED bulb 101 has a size corresponding to, for example, a 60 W type bulb, and has a diameter of about 55 mm and a height of about 108 mm.

  As shown in FIGS. 3 and 4, in the present embodiment, the LED light emitting unit 200 has a rectangular thin plate shape as a whole. As shown in FIG. 3, the LED light emitting unit 200 includes an LED substrate 210, a plurality of LED chips 220, a sealing resin 230, and a dam portion 240. The LED substrate 210 has a rectangular shape and is made of ceramics such as alumina. A plurality of LED chips 220 are mounted on the LED substrate 210 and a wiring pattern (not shown) serving as a path for supplying power to these LED chips 220 is formed.

  The LED chip 220 can emit blue light, for example. The LED chip 220 is a so-called two-wire type that is connected to the above-described wiring pattern of the LED substrate 210 via two wires. However, the LED chip 220 is not limited to this, and is a one-wire type or a flip-chip type. It may be. The plurality of LED chips 220 are arranged in a matrix on the LED substrate 210.

  The sealing resin 230 seals the plurality of LED chips 220 and is made of a resin material such as a silicone resin or an epoxy resin that transmits light from the LED chips 220. The sealing resin 230 is formed to include a fluorescent material that emits yellow light when excited by light from the LED chip 220, for example. As said fluorescent substance, it may replace with what emits yellow light, and may mix and use what emits red light, and what emits green light. The dam portion 240 is formed in a rectangular frame shape on the LED substrate 210 and is made of, for example, a white silicone resin. In the formation of the sealing resin 230, the dam portion 240 prevents the liquid resin material from flowing out to an unintended region by blocking the liquid resin material.

  The LED light emitting unit 200 having the above configuration is mounted on a spacer 320 of a base 300 described later. In the drawings, the traveling direction of the light emitted from the LED light emitting unit 200 is appropriately expressed using arrows.

  As shown in FIGS. 1 and 2, the base 300 includes a main body 310 and a spacer 320 in the present embodiment. The base 300 supports the LED light emitting part 200 and constitutes a support part of the present invention. The material of the base 300 is preferably a material having high thermal conductivity, and for example, a metal such as aluminum is used. Unlike the present embodiment, the base 300 may be formed as an integrally molded product.

  The main body 310 has a shape similar to a trumpet as a whole and includes a plurality of fins 311. The plurality of fins 311 are formed radially outward. The main body 310 is formed with a power supply accommodating recess 312. The power supply accommodating recess 312 is a part that accommodates at least a part of the power supply unit 400, and accommodates most of the power supply unit 400 in this embodiment. The spacer 320 has a disk shape and is attached to the upper end of the main body 310 in the drawing. The LED light emitting unit 200 described above is mounted at the center of the upper surface of the spacer 320 in the drawing, and in this embodiment, the upper surface of the spacer 320 is the mounting surface 321 of the LED light emitting unit 200. The spacer 320 is formed with a wiring through hole 322 through which the wiring 430 of the power supply unit 400 passes. The wiring 430 is for guiding the DC power from the plurality of electronic components 420 to the LED light emitting unit 200. The wiring 430 reaches the LED light emitting unit 200 from the substrate 410 described later through the wiring through hole 322 of the spacer 320.

The power supply unit 400 generates DC power suitable for lighting the LED light emitting unit 200 (LED mochip 220) from, for example, a commercial AC 100V power supply, and supplies this DC power to the LED light emitting unit 200 (LED chip 220). As shown in FIG. 2, a substrate 410 and a plurality of electronic components 420 are provided.

  The board | substrate 410 is used for the thing excellent in thermal conductivity, for example, consists of a glass composite copper clad laminated board. The substrate 410 has a circular shape as a whole. A plurality of electronic components 420 are mounted on the lower surface of the substrate 410 in the drawing. A wiring pattern (not shown) serving as a path for supplying power to the LED chip 220 is appropriately formed on the lower surface in the drawing and the upper surface in the drawing. The wiring pattern on the upper surface and the wiring pattern on the lower surface are defined as follows. For example, they are appropriately conducted through through-hole vias. The substrate 410 is fixed to the base 300 with its peripheral edge sandwiched between the main body 310 of the base 300 and the spacer 320.

  The plurality of electronic components 420 function to convert, for example, a commercial AC 100V power source into DC power suitable for lighting the LED light emitting unit 200 (LED chip 220). The plurality of electronic components 420 include, for example, a capacitor, a resistor, a coil, a diode, an IC, and the like. For example, in FIG. 2, the electronic component 420 that protrudes most downward in the figure at approximately the center of the power supply accommodating recess 312 is a capacitor.

  The base 600 is a part that is attached to, for example, a general light fixture for a light bulb that complies with JIS standards. The base 600 is configured to satisfy specifications such as E17 and E26 defined in the JIS standard. The base 600 is connected to the power supply unit 400 by wiring (not shown).

  The globe 500 bulges to the front side (one side in the x direction) of the mounting surface 321 of the spacer 320 and covers the LED light emitting unit 200. The globe 500 transmits light emitted from the LED light emitting unit 200. Further, in the present embodiment, the globe 500 is configured to transmit light while diffusing it. Such a globe 500 contains, for example, a light diffusing agent and is made of milky white translucent resin.

  As shown in FIGS. 1 and 2, in the present embodiment, the globe 500 has a dome-shaped portion 501, a narrowed portion 502, and an insertion portion 503. The dome-shaped portion 501 is located on the front surface (one side in the x direction) of the mounting surface 321 and is substantially hemispherical. The narrowed portion 502 is connected to the spacer 320 (base 300) side with respect to the dome-shaped portion 501. The constricted portion 502 is constricted as it approaches the spacer 320, and is, for example, a substantially partial sphere. In the present embodiment, the boundary between the dome-shaped portion 501 and the constricted portion 502 is the maximum outer shape having a maximum dimension perpendicular to the central axis O1. The insertion portion 503 is used to fix the globe 500 to the base 300 by being inserted into a groove formed in the base 300. In the present embodiment, the globe 500 has a rotationally symmetric shape with a central axis O1 along the x direction (first direction) extending from the base 300 to the apex 504 of the globe 500 as a rotationally symmetric axis.

  As shown in FIGS. 1, 2, and 5, a light transmission surface 511 and a light reflection surface 512 are provided inside the globe 500. The light transmission surface 511 intersects the central axis O1 and transmits light from the LED light emitting unit 200. In the present embodiment, the light transmission surface 511 is a plane that intersects the central axis O1 at a right angle, and is circular with the central axis O1 as the center when viewed in the x direction. The light transmission surface 511 is a portion intended to increase the proportion of light that is transmitted through the globe 500 and emitted outside from the LED light emitting unit 200. The light transmission surface 511 is configured such that the incident angle of light from the LED light emitting unit 200 is reduced. Such a light transmission surface 511 may be constituted by a curved surface such as a gentle concave surface.

  The light reflecting surface 512 is arranged in an annular shape so as to surround the central axis O <b> 1 and surrounds the light transmitting surface 511. As shown in FIG. 2, the light reflecting surface 512 is a curved surface that is displaced to one side in the x direction (upper side in the figure) as the distance from the central axis O1 increases. In the present embodiment, the light reflecting surface 512 has a concave arc shape in a cross section including the central axis O1. The light reflecting surface 512 is a portion intended to increase the rate at which the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512. The light reflecting surface 512 is configured such that the incident angle of light from the LED light emitting unit 200 is larger than the incident angle on the light transmitting surface 511.

  The light transmission surface 511 and the light reflection surface 512 are provided in the dome-shaped portion 501. The portion 513 where the light transmission surface 511 and the light reflection surface 512 are not provided in the dome-shaped portion 501 has a uniform thickness. Further, the thickness of the constricted portion 502 is also uniform, and is the same as the thickness of the portion 513 in the dome-shaped portion 501. Taking an example of the thickness of the globe 500, the thickness of the portion 513 in the dome-shaped portion 501 and the constricted portion 502 is, for example, about 0.5 to 6.0 mm.

  The globe 500 having the above configuration is formed by the following procedure, for example. First, members corresponding to the dome-shaped portion 501 and the narrowed portion 502 are formed using the corresponding molds. Next, the members corresponding to the dome-shaped portion 501 and the narrowed portion 502 are joined at the boundary portion that is the maximum outer diameter portion. Here, as a method for joining the members corresponding to the dome-shaped portion 501 and the narrowed portion 502, various methods such as joining by uneven fitting, joining by ultrasonic welding, joining by an adhesive, and the like can be adopted. .

  Next, the operation of the LED bulb 101 will be described.

  According to the present embodiment, the light reflecting surface 512 is formed inside the globe 500. The light from the LED light emitting unit 200 is reflected by the light reflecting surface 512. The light reflected by the light reflecting surface 512 travels obliquely downward in FIG. 5 and is transmitted to the outside through the globe 500 (mainly the constricted portion 502). Therefore, the LED bulb 101 illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  Further, part of the light reaching the light reflecting surface 512 is transmitted through the light reflecting surface 512 and emitted upward in FIG. Furthermore, a light transmission surface 511 is provided inside the globe 500 in front of the LED light emitting unit 200. Thereby, the light from the LED light emitting unit 200 passes through the light transmission surface 511 and the light reflection surface 512 and is emitted upward in the drawing. Therefore, the LED bulb 101 can be illuminated sufficiently brightly even in the upper part of the figure.

  The globe 500 contains a light diffusing agent. Thereby, the light from the LED light emitting unit 200 (including the light reflected by the light reflecting surface 512) is emitted to the outside while being diffused by the globe 500. Therefore, in the LED bulb 101, a wide range can be illuminated uniformly.

  6 to 18 show another embodiment of the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

  FIG. 6 shows an LED bulb according to a second embodiment of the present invention. The LED bulb 102 of the present embodiment is different from the above-described embodiment in the configuration of the globe 500.

  The constricted portion 502 has a thin portion 521 having a smaller thickness than a portion 513 where the light transmitting surface 511 and the light reflecting surface 512 are not provided in the dome-shaped portion 501. The thin portion 521 is formed by denting the inside of the globe 500. As an example of the dimension of the globe 500, the thickness T1 of the portion 513 in the dome-shaped portion 501 is about 0.5 to 6.0 mm, and the thickness T2 of the thin portion 521 is 0.3 to 3.0 mm. It is said to be about. Further, the ratio (T2 / T1) of the thickness T2 of the thin portion 521 to the thickness T1 of the portion 513 is, for example, about 1/20 to 14/20. The portion 513 of the present embodiment corresponds to an example of the first portion referred to in the present invention, and the thin portion 521 corresponds to an example of the second portion referred to in the present invention.

  In the LED bulb 102 of the present embodiment, the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512, and this reflected light travels obliquely downward in FIG. 6, and the globe 500 (mainly the constricted portion 502). And is emitted to the outside. Therefore, the LED bulb 102 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  In addition, since the thinned portion 502 is provided with the thin portion 521, the light reflected by the light reflecting surface 512 is efficiently emitted to the outside through the thin portion 521. Such a configuration is suitable for more brightly illuminating a diagonally lower portion in the drawing.

  FIG. 7 shows an LED bulb according to a third embodiment of the present invention. The LED bulb 103 of this embodiment is different from the above-described embodiment in the configuration of the globe 500.

  On the inner side of the narrowed portion 502, an uneven portion 522 including a concave portion 522a and a convex portion 522b is provided. The concave portions 522a and the convex portions 522b are formed in an annular shape centering on the central axis O1, and are alternately arranged in the x direction. In the present embodiment, the convex portion 522b has a trapezoidal cross section. The thickness of the convex portion 522b is the same as the thickness of the portion 513 where the light transmitting surface 511 and the light reflecting surface 512 are not provided in the dome-shaped portion 501, and is, for example, about 0.5 to 6.0 mm. The thickness T3 in the recess 522a is smaller than the thickness of the portion 513, for example, about 0.3 to 2.0 mm. Moreover, the pitch P1 of the adjacent convex part 522b shall be about 0.3-5 mm, for example. The concavo-convex portion 522 having such a configuration constitutes a second portion referred to in the present invention.

  In the LED bulb 103 of the present embodiment, the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512, and this reflected light travels obliquely downward in FIG. 7, and the globe 500 (mainly the constricted portion 502). And is emitted to the outside. Therefore, the LED bulb 103 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  In addition, the concavo-convex portion 522 provided in the narrowed portion 502 transmits the light reflected by the light reflecting surface 512 while diffusing it. Such a configuration is suitable for brightly illuminating a wider range in the diagonally lower direction in the figure.

  FIG. 8 shows an LED bulb according to a fourth embodiment of the present invention. The LED bulb 104 of the present embodiment is different from the above-described embodiment in the configuration of the globe 500.

  In this embodiment, the dome-shaped portion 501 has a relatively high concentration of light diffusing agent, while the constricted portion 502 has a relatively low concentration of light diffusing agent. The dome-shaped portion 501 constitutes a high-density light diffusion portion referred to in the present invention, and the constricted portion 502 constitutes a low-density light diffusion portion referred to in the present invention. Further, the thickness of the narrowed portion 502 is uniform, and is the same as the thickness of the portion 513 where the light transmitting surface 511 and the light reflecting surface 512 are not provided in the dome-shaped portion 501.

  In the LED bulb 104 of the present embodiment, the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512, and this reflected light travels obliquely downward in FIG. 8, and the globe 500 (mainly the constricted portion 502). And is emitted to the outside. Therefore, the LED bulb 104 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  Further, since the constricted portion 502 constitutes a low-concentration light diffusing portion, the light reflected by the light reflecting surface 512 is efficiently emitted to the outside through the constricted portion 502. Such a configuration is suitable for more brightly illuminating a diagonally lower portion in the drawing.

  FIG. 9 shows an LED bulb according to a fifth embodiment of the present invention. The LED bulb 105 of the present embodiment is different from the above-described embodiment in the configuration of the globe 500.

  On the inner side of the narrowed portion 502, an uneven portion 522 including a concave portion 522a and a convex portion 522b is provided. The shape of the concavo-convex portion 522 is the same as that of the LED bulb 103 described with reference to FIG.

  In the present embodiment, similarly to the LED bulb 104, the dome-shaped portion 501 has a relatively high concentration of light diffusing agent, while the constricted portion 502 has a relatively low concentration of light diffusing agent. It will be lost.

  In the LED light bulb 105 of the present embodiment, the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512, and this reflected light travels obliquely downward in FIG. 9, and the globe 500 (mainly the constricted portion 502). And is emitted to the outside. Therefore, the LED bulb 105 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  In addition, the concavo-convex portion 522 provided in the narrowed portion 502 transmits the light reflected by the light reflecting surface 512 while diffusing it. Such a configuration is suitable for brightly illuminating a wider range in the diagonally lower direction in the figure.

  Since the constricted portion 502 constitutes a low-density light diffusion portion, the light reflected by the light reflecting surface 512 is efficiently emitted to the outside through the constricted portion 502. Such a configuration is suitable for more brightly illuminating a diagonally lower portion in the drawing.

  FIG. 10 shows an LED bulb according to a sixth embodiment of the present invention. The LED bulb 106 of this embodiment is different from the above-described embodiment in the configuration of the globe 500.

  In the present embodiment, the dome-shaped portion 501 of the globe 500 is not provided with the light transmitting surface 511 and the light reflecting surface 512 of the first embodiment, and the dome-shaped portion 501 has a uniform thickness. Yes. The narrowed portion 502 has a thin portion 521 having a thickness smaller than that of the dome-shaped portion 501. The thin portion 521 is formed by denting the inside of the globe 500.

  In the LED bulb 106 of this embodiment, the light from the LED light emitting unit 200 is transmitted while being diffused by the globe 500 (mainly the dome-shaped portion 501). Here, a part of the light diffused by the globe 500 travels obliquely downward in the drawing inside the globe 500, passes through the globe 500 (mainly the constricted portion 502), and is emitted to the outside. Therefore, the LED bulb 106 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  In addition, since the thinned portion 521 is provided in the constricted portion 502, light traveling obliquely downward inside the globe 500 is efficiently emitted to the outside through the thinned portion 521. Such a configuration is suitable for more brightly illuminating a diagonally lower portion in the drawing.

  FIG. 11 shows an LED bulb according to a seventh embodiment of the present invention. The LED bulb 107 of this embodiment is different from the above-described embodiment in the configuration of the globe 500.

  In the present embodiment, the dome-shaped portion 501 of the globe 500 is not provided with the light transmitting surface 511 and the light reflecting surface 512 of the first embodiment, and the dome-shaped portion 501 has a uniform thickness. Yes. On the inner side of the narrowed portion 502, an uneven portion 522 including a concave portion 522a and a convex portion 522b is provided. The concave portions 522a and the convex portions 522b are formed in an annular shape centering on the central axis O1, and are alternately arranged in the x direction. In the present embodiment, the convex portion 522b has a partial circular cross-sectional shape. The concave portion 522a is a groove having a V-shaped cross section located between the adjacent convex portions 522b. The thickness of the top portion of the convex portion 522b is approximately the same as the thickness of the dome shape portion 501, and the thickness of the concave portion 522a is smaller than the thickness of the dome shape portion 501.

  In the LED bulb 107 of the present embodiment, light from the LED light emitting unit 200 is transmitted while being diffused by the globe 500 (mainly the dome-shaped portion 501). Here, a part of the light diffused by the globe 500 travels obliquely downward in the drawing inside the globe 500, passes through the globe 500 (mainly the constricted portion 502), and is emitted to the outside. Therefore, the LED bulb 107 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  Further, the uneven portion 522 provided in the constricted portion 502 transmits light that travels obliquely downward inside the globe 500 while diffusing it. Such a configuration is suitable for brightly illuminating a wider range in the diagonally lower direction in the figure.

  FIG. 12 shows an LED bulb according to an eighth embodiment of the present invention. The LED bulb 108 of the present embodiment is different from the above-described embodiment in the configuration of the globe 500.

  In the present embodiment, the dome-shaped portion 501 of the globe 500 is not provided with the light transmitting surface 511 and the light reflecting surface 512 of the first embodiment, and the dome-shaped portion 501 has a uniform thickness. Yes. Further, the thickness of the narrowed portion 502 is also uniform, and is the same as the thickness of the dome-shaped portion 501. In this embodiment, the dome-shaped portion 501 has a relatively high concentration of light diffusing agent, while the constricted portion 502 has a relatively low concentration of light diffusing agent.

  The glove 500 having such a configuration is formed by, for example, blow molding. In blow molding, a resin material is injected from a plurality of gates. For example, a material corresponding to the dome-shaped portion 501 (resin material having a high concentration of light diffusing agent) is injected from one gate, and a material corresponding to the constricted portion 502 (containing a light diffusing agent) from the other gate. By injecting a resin material having a low concentration and curing these materials integrally, the globe 500 having the above-described configuration can be obtained.

  In the LED bulb 108 of the present embodiment, the light from the LED light emitting unit 200 is transmitted while being diffused by the globe 500 (mainly the dome-shaped portion 501). Here, a part of the light diffused by the globe 500 travels obliquely downward in the drawing inside the globe 500, passes through the globe 500 (mainly the constricted portion 502), and is emitted to the outside. Accordingly, the LED bulb 108 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  Further, since the constricted portion 502 constitutes a low-concentration light diffusing portion, light traveling obliquely downward inside the globe 500 is efficiently emitted to the outside through the constricted portion 502. Such a configuration is suitable for more brightly illuminating a diagonally lower portion in the drawing.

  13 and 14 show an LED bulb according to a ninth embodiment of the present invention. The LED bulb 109 of the present embodiment is different from the above-described embodiment in the configuration of the globe 500.

  In the present embodiment, the dome-shaped portion 501 of the globe 500 is not provided with the light transmitting surface 511 and the light reflecting surface 512 of the first embodiment, and the dome-shaped portion 501 has a uniform thickness. Yes. Further, the thickness of the narrowed portion 502 is also uniform, and is the same as the thickness of the dome-shaped portion 501.

  In the present embodiment, the globe 500 includes a high-concentration light diffusing unit 560 having a relatively high concentration of light diffusing agent and a low-concentration light diffusing unit 570 having a relatively low concentration of light diffusing agent. A plurality of high-concentration light diffusion portions 560 and low-concentration light diffusion portions 570 are provided, each extending from the base 300 side to the apex 504. The high-concentration light diffusion unit 560 and the low-concentration light diffusion unit 570 are alternately arranged in the circumferential direction of the central axis O1. The globe 500 having such a configuration is formed by, for example, forming members corresponding to the high-concentration light diffusing portion 560 and the low-concentration light diffusing portion 570 using molds corresponding to the respective members, and joining these members. To do.

  In the LED bulb 109 of the present embodiment, the light from the LED light emitting unit 200 is transmitted while being diffused by the globe 500 (mainly the dome-shaped portion 501). Here, a part of the light diffused by the globe 500 travels obliquely downward in the drawing inside the globe 500, passes through the globe 500 (mainly the constricted portion 502), and is emitted to the outside. Therefore, the LED bulb 109 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  In addition, since the globe 500 includes the low-density light diffusion unit 570, the light from the LED light emitting unit 200 is efficiently emitted to the outside through the low-density light diffusion unit 570. Such a configuration is suitable for brightly illuminating a wider area.

  15 and 16 show an LED bulb according to a tenth embodiment of the present invention. The LED bulb 110 of the present embodiment is different from the above-described embodiments in the configuration of the LED light emitting unit 200, the base 300, and the globe 500.

  In the present embodiment, the LED light emitting unit 200 includes a plurality of LED modules 201. As shown in FIG. 17, the LED module 201 includes an LED chip 202, a pair of leads 203, a case 205, a sealing resin 206, and wires 207. The pair of leads 203 is made of, for example, a Cu alloy, and the LED chip 202 is mounted on one of them. A surface of the lead 203 opposite to the surface on which the LED chip 202 is mounted is a mounting terminal 204 used for surface mounting the LED module 201. The LED chip 202 is a light source of the LED module 201 and can emit blue light, for example. The sealing resin 206 is for protecting the LED chip 202. The sealing resin 206 is formed using a light-transmitting resin including a fluorescent material that emits yellow light when excited by light from the LED chip 202. As said fluorescent substance, it may replace with what emits yellow light, and may mix and use what emits red light, and what emits green light. The case 205 is made of, for example, a white resin, and reflects light emitted from the LED chip 202 to the side.

  Each LED module 201 having the above configuration is mounted on the mounting surface 411 (the upper surface in FIG. 16) of the substrate 410. As shown in FIG. 18, in the present embodiment, the plurality of LED modules 201 are arranged in a matrix.

  The base 300 supports the LED module 201 (LED light emitting unit 200) via the substrate 410. The base 300 and the substrate 410 constitute a support part of the present invention. An opening 323 is formed in the spacer 320. The opening 323 is provided to avoid interference with the LED module 201.

  The globe 500 includes a dome-shaped portion 501 having a light transmission surface 511 and a light reflection surface 512. The aspects of the light transmission surface 511 and the light reflection surface 512 are substantially the same as those of the first embodiment, but the first embodiment is different from the first embodiment in that a cylindrical portion 505 connected to the dome-shaped portion 501 is provided instead of the constricted portion 502. Different from the embodiment.

  In the LED bulb 110 of the present embodiment, the light from the LED light emitting unit 200 is reflected by the light reflecting surface 512, and this reflected light travels obliquely downward in FIG. 16, and passes through the globe 500 (mainly the cylindrical portion 505). The light is transmitted to the outside. Therefore, the LED bulb 110 also illuminates the side or diagonally lower side in the figure, and can illuminate a wider range.

  As mentioned above, although specific embodiment of this invention was described, the LED bulb which concerns on this invention is not limited to embodiment mentioned above. The specific configuration of each part of the LED bulb according to the present invention can be varied in design in various ways.

101-110 LED bulb O1 central axis x direction (first direction)
200 LED light emitting part 201 LED module 202 LED chip 203 lead 204 mounting terminal 205 case 206 sealing resin 207 wire 210 LED substrate 220 LED chip 230 sealing resin 240 weir part 300 base 310 main body 311 fin 312 power supply recess 320 spacer 321 Mounting surface 322 Wiring through hole 323 Opening 400 Power supply portion 410 Substrate 411 Mounting surface 420 Electronic component 430 Wiring 500 Globe 501 Dome shape portion 502 Constriction portion 503 Insertion portion 504 Vertex 505 Cylindrical portion 511 Light transmission surface 512 Light reflection surface 513 Portion 521 Thin portion 522 Concave and convex portion 522a Concave portion 522b Convex portion 560 High concentration light diffusion portion 570 Low concentration light diffusion portion

Claims (10)

An LED light emitting unit having one or more LED chips;
A support portion having a mounting surface on which the LED light emitting portion is mounted;
A glove that covers the LED light emitting part and transmits light;
The globe extends from a first region that overlaps the mounting surface in the vertical direction of the mounting surface toward a second region that is outside the first region, and the mounting as it goes outward in the vertical direction. A first glove part that is displaced so as to approach the mounting surface in a vertical direction of the surface;
A second glove part connected to the first glove part, located on the mounting surface side of the first glove part in the vertical direction, and disposed in the second region in the vertical direction view; Have
The LED bulb in which the transmittance of light emitted from the LED light emitting unit in the globe is higher in the second globe unit than in the first globe unit.   The LED bulb according to claim 1, wherein a thickness of the first globe part is thicker than a thickness of the second globe part. The second glove part has a concavo-convex part consisting of a concave part and a convex part on the surface thereof,
The LED bulb according to claim 1, wherein a thickness of the concave portion is thinner than a thickness of the first globe portion.   4. The LED bulb according to claim 3, wherein each of the concave portion and the convex portion is formed in an annular shape centering on a central axis along the vertical direction, and is alternately arranged in the vertical direction.   The LED light bulb according to claim 3 or 4, wherein the uneven portion is located inside the globe. The globe contains a light diffusing agent,
The LED light bulb according to claim 1, wherein the content concentration of the light diffusing agent is higher in the first glove part than in the second glove part.   The said glove | globe is connected with the said support part in the edge part on the opposite side to the said 1st glove part with respect to the said 2nd glove part in the said perpendicular direction. LED bulb.   The LED light bulb according to any one of claims 1 to 7, wherein the LED light emitting unit includes an LED substrate attached to the support unit and having the LED chip mounted on the surface thereof.   The LED bulb according to claim 8, wherein the support unit houses a power supply unit that is electrically connected to the LED light emitting unit and supplies power to the LED light emitting unit on a back surface side of the LED substrate.   The LED light bulb according to claim 9, wherein the support part has a base electrically connected to the power supply part at an end part on a back surface side of the LED substrate.

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