JP2015049970A - Led bulb and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED bulb that can be formed at low cost and that includes a high luminance light-emitting unit in a light guide element, and a lighting device to which this LED bulb is attached.SOLUTION: An LED bulb 1 includes: a casing 2 having a mouthpiece 15 provided on one end 2a thereof; a plurality of LEDs 3 provided on an end surface 9a on the other end 2b of the casing 2; a light guide element 4 that is formed into a cylindrical shape including a flat end surface 22 that is provided on one end 4c of the light guide element 4 in a longitudinal direction and on which radiation light of the LEDs 3 is incident, an inclined end surface 23 provided on the other end 4d thereof in the longitudinal direction and inclined so as to be able to reflect guided radiation light toward an outer surface 4a, a through-hole 24 penetrating the flat end surface 22 and the inclined end surface 23, and an attachment section 25 provided on one end 4c, and that is attached to an end surface 9a on the other end 2b of the casing 2 via the attachment section 25 so that the flat end surface 22 is proximate to the LEDs 3; an enclosure member 5 attached to the other end 2b of the casing 2 so as to cover the light guide element 4; and a lighting device 6 provided in the casing 2 and turning on the LEDs 3.

Description

Embodiments of the present invention relate to an LED bulb that emits light emitted from an LED serving as a light source with a light guide and emits the emitted light to an external space, and a lighting fixture on which the LED bulb is mounted.

In this type of LED bulb, there is one in which the tip of the light guide is formed on an inclined surface (taper), and the emitted light of the LED guided from the base end is refracted in the lateral direction on the inclined surface. . This light guide is provided with its end face close to the LED so that the emitted light from the LED is incident on the end face of the base end. And the LED bulb which arrange | positions a light-emitting body corresponding to each LED is proposed (for example, refer patent document 1). In this LED bulb, an uneven surface is formed on the outer surface of the base end side of the light guide, and emitted light is emitted in the lateral direction also from the uneven surface.

The LED bulb has a plurality of LEDs arranged at equal intervals on the same circumference in order to emit radiation light uniformly in all directions to obtain a wide light distribution. And the light guide is generally attached to the board | substrate with which LED was mounted.

By the way, light bulbs that replace candles are used in worship halls and wedding halls. As this light bulb, an LED light bulb is becoming popular as a replacement for a candle, and this LED light bulb is required to have a high luminance of the light emitting part so as to approximate a conventional light bulb or candle.

Japanese Patent Laying-Open No. 2012-234783 (page 3, FIG. 2)

When the light guide is provided corresponding to each LED, for example, it takes a lot of labor to attach the light guide to the substrate, and has the disadvantage of increasing the cost of the LED bulb. In addition, an LED bulb that emits light from the outer surface on the proximal end side of the light guide body appears to emit almost the entire light guide body, so that the brightness of the light emitting portion is reduced and approximates that of a conventional candle or light bulb. It has the disadvantage that things cannot be obtained.

An object of the present embodiment is to provide an LED bulb that can be formed at low cost and has a light-emitting portion with high luminance on a light guide, and a lighting fixture that is equipped with the LED bulb.

The LED light bulb of this embodiment includes a housing, an LED, a light guide, an enclosure, and a lighting device.

The casing is provided with a base on one end side and a plurality of LEDs on the end face side on the other end side.

The light guide guides the emitted light of the LED from one end side to the other end side, and is formed in a cylindrical shape. That is, a flat end surface on one end side in the longitudinal direction, an inclined end surface that inclines so that the emitted light of the LED guided to the other end side in the longitudinal direction can be reflected to the outer surface side, and the flat end surface and the inclined end surface penetrate through the cylindrical central axis A through hole and an attachment portion on one end side. And the light guide is attached to the end face side of the other end side of the housing through the attaching portion so that the flat end face is close to the plurality of LEDs.

The enclosure is attached to the other end of the housing so as to cover the light guide. The lighting device is provided in the housing, operates by being supplied with power through a base, and is configured to light a plurality of LEDs.

According to the LED bulb of the present embodiment, the light guide has a through hole, and is attached to the end face on the other end side of the housing through the attachment portion so that the flat end face is close to the plurality of LEDs. Therefore, the light guide can be easily provided, and the light intensity per unit area of the radiated light reflected and emitted from the inclined end surface on the other end side of the light guide is increased, resulting in high brightness. Can be expected.

It is a partially cutaway schematic side view of the LED bulb showing the first embodiment of the present invention. It is a schematic top view of the state which removed the enclosure of the LED bulb same as the above. It is a partially cut away schematic side view of the LED bulb which shows the 2nd Embodiment of this invention. It is a schematic top view of the state which removed the enclosure of the LED bulb same as the above. It is a partially cut away schematic side view of the LED bulb which shows the 3rd Embodiment of this invention. It is a schematic top view of the state which removed the enclosure of the LED bulb same as the above. It is a partial notch schematic side view of the lighting fixture which shows the 4th Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

As shown in FIG. 1, the LED bulb 1 of the present embodiment is a candle bulb type LED bulb that is attached to and detached from a bulb socket. The LED bulb 1 includes a housing 2, an LED 3, a light guide 4, an enclosure 5 and a lighting device 6.

In this embodiment, the housing 2 is made of a metal material having a high thermal conductivity, such as an outer case 7 made of aluminum (Al), and a synthetic resin having an electrical insulating property and a high thermal conductivity, such as a polybutylene terephthalate (PBT) resin. It is formed by the attachment body 8.

The outer case 7 is formed, for example, by die casting into a cylindrical shape of a substantially inverted truncated cone that gradually increases in diameter from one end side 7a to the other end side 7b, and a dowel 9 that protrudes inward is provided on the other end side 7b. Yes. In the present embodiment, four dowels 9 are formed at 90 ° intervals in the circumferential direction, and have a flat end face 9a. A heat sink 10 is placed on the end surface 9 a of the dowel 9. The heat radiating plate 10 is fixed to the end surface 9 a by screws 11. The heat radiating plate 10 is provided with an insertion hole 12 through which the screw 11 is inserted, and the dowel 9 is provided with a screw hole 13 of the screw 11. And the board | substrate 14 with which LED3 was mounted is attached to the heat sink 10. FIG.

The attachment body 8 is inserted into the outer case 7 and attached to the outer case 7 by attachment means (not shown). The attachment body 8 has one end side 8 a formed in a substantially cylindrical shape and the other end side 8 b formed in a cylindrical shape having an outer shape along the inner surface of the outer case 7. The mounting body 8 has a spiral strip (not shown) spirally formed on the outer surface of one end side 8a (one end side 2a of the housing 2), and the base 15 is screwed to the convex strip.

The base 15 has, for example, an E12 shape, and is a male screw portion 16 that is screwed and fixed to a protruding strip, an insulating portion 17 provided on a distal end side 16 a of the male screw portion 16, and a bottom point of the insulating portion 17. It has the top connection part 18 provided. The male screw portion 16 is made of, for example, aluminum (Al) and is formed in a substantially cylindrical shape, and the top connection portion 18 is made of, for example, brass and is formed in a substantially truncated cone shape. The insulating portion 17 is made of, for example, glass or ceramic, is formed in a truncated cone shape, is attached by being attached to the male screw portion 16, and is provided with a top connection portion 18 at the bottom point.

The male screw portion 16 and the top connection portion 18 are electrically connected to an external power source via a light bulb socket. The insulating portion 19 electrically insulates the male screw portion 16 and the top connecting portion 18 which are each made of metal by separating them. Thus, the base 15 is provided on the one end side 2 a of the housing 2 by attaching the male screw portion 16 to the attachment body 8.

The casing 2 may be formed by integrally molding the mounting body 8 with the outer case 7 if the outer case 7 is formed of a synthetic resin or ceramic having high thermal conductivity and electrical insulation. Good.

The substrate 14 attached to the heat radiating plate 10 is made of, for example, a flat synthetic resin plate having a thickness of 1.2 mm, for example, a glass epoxy plate, and has an outer shape of, for example, a regular square as shown in FIG. The substrate 14 is attached in close contact with the heat sink 10 by screws 19. A plurality of LEDs 3 are mounted on the substrate 14.

The plurality of LEDs 3 are provided on the one surface 14a side of the substrate 14 at equal intervals on the same circumference, and are connected in series by a wiring pattern (not shown). The LEDs 3 connected in series are connected to a connector 20 provided on the one surface 14 a side of the substrate 14. And it is connected to the lighting device 6 by an output line 21 electrically connected to the connector 20.

The LED 3 is a package product, for example, one that emits white light. Then, when a predetermined constant current is supplied from the lighting device 6, the LED 3 is turned on (emits light) and emits white light. Thus, the plurality of LEDs 3 are provided on the end surface 9 a side of the other end side 2 b of the housing 2.

And the white light radiated | emitted from LED3 is light-guided by the light guide 4, and is radiate | emitted from the light guide 4, and permeate | transmits the enclosure 5 and is radiate | emitted to external space. The light guide 4 is made of, for example, polycarbonate (PC) resin. As shown in FIG. 1, the light guide 4 has an annular flat end face 22 on one end side 4c in the longitudinal direction, an annular inclined end face 23 on the other end side 4d in the longitudinal direction, The through hole 24 that penetrates the end surface 22 and the inclined end surface 23 and the outer surface 4a of the one end side 4c are formed in a substantially cylindrical shape having a mounting portion 25.

The flat end surface 22 has a planar shape that is parallel to the substrate 14 and is sized to cover the plurality of LEDs 3. That is, the flat end surface 22 is made to receive the emitted light of the LED 3, and as shown in FIG. 2, the width W1 covering the LED 3 and the width W2 of the LED 3 are, for example, 0.7 * W1 <W2 <1.3 *. It is formed so as to have a relationship of W1. The inclined end face 23 is as shown in FIG. It is formed in a flat inclined surface inclined from the inner surface 4b to the outer surface 4a. The inclined surface is formed at 45 ° or a value in the vicinity thereof, for example, 45 ° ± 5 ° so that the radiated light (white light) of the guided LED 3 can be reflected toward the outer surface 4a.

The through-hole 24 is formed in a cylindrical shape penetrating the flat end surface 22 and the inclined end surface 23 on the cylindrical central axis (not shown) of the light guide 4 so that the flat end surface 22 has the width W1. Is formed. Further, the attachment portion 25 is formed in a substantially rectangular columnar body that projects from the outer surface 4a at a right angle outward and hangs down. In the present embodiment, as shown in FIG. 2, four mounting portions 25 are provided at intervals of 90 ° in the circumferential direction of the outer surface 4a. The light guide 4 is improved in moldability by providing the through hole 24.

The attachment portion 25 is attached to the heat radiating plate 10 with screws 26. That is, as shown in FIG. 1, the mounting portion 25 is provided with an insertion hole 27 through which the screw 26 is inserted, and the heat radiating plate 10 is provided with a screw hole (not shown) of the screw 26. The mounting portion 25 has a height from the heat radiating plate 10 so that the flat end surface 22 is close to the plurality of LEDs 3 provided on the substrate 14. Thus, the light guide 4 has the four attachment portions 25 attached to the end surface 9 a side of the other end side 2 b of the housing 2 such that the flat end face 22 is close to the plurality of LEDs 3.

And the enclosure 5 is attached to the other end side 2b of the housing | casing 2 so that the light guide 4 may be covered. The enclosure 5 is made of a transparent resin material such as polycarbonate (PC) resin, and is molded into a substantially bullet shape in which the other end 5b is closed and the one end 5a is opened. The enclosure 5 is attached to the housing 2 with the locking portion 28 on one end side 5 a being locked to the locked portion 29 on the other end side 2 b of the housing 2.

The lighting device 6 is provided in the attachment body 8 of the housing 2. The lighting device 6 includes a large number of electronic components mounted on a circuit board, and forms a lighting circuit that lights the LED 3 using the electronic components. In the lighting device 6, an unillustrated input line is connected to the male screw portion 16 and the top connection portion 18 of the base 15. Further, as shown in FIG. 2, the output line 21 is led out to the one surface 14 a side of the substrate 14 through the notch 30 of the heat radiating plate 10, and a connector 21 </ b> A provided at the tip of the output line 21 is provided on the substrate 14. The connector 20 is electrically connected. The lighting device 6 operates when an AC voltage (for example, AC 100 V) of an external power source is supplied through the base 15, and supplies a predetermined current to the plurality of LEDs 3 through the output line 21.

Next, the operation of the first embodiment of the present invention will be described.

The LED bulb 1 is attached to a bulb socket of a lighting fixture. Then, when an AC voltage from an external power source is applied to the base 15, the lighting device 6 operates and a predetermined current (power) is supplied from the lighting device 6 to the plurality of LEDs 3. The plurality of LEDs 3 are lit and emit white light. White light enters the light guide 4 from the flat end face 22 of the light guide 4. Here, the flat end face 22 has a plurality of LEDs 2.
2, and is large enough to cover the plurality of LEDs 22, the white light emitted from the LEDs 3 is incident on the light guide 4 with substantially the entire amount of light.

The white light that has entered the light guide 4 propagates from the one end side 4 c of the light guide 4 to the other end side 4 d and reaches the inclined end surface 23. Part of the white light passes through the inclined end face 23 and is emitted to the front side along the longitudinal direction of the light guide 4. A part of the white light is refracted to the outer surface 4 a side at the inclined end surface 23 and is emitted to the side of the light guide 4. Since the inclined end face 23 is formed with a gradient of 45 ° or the vicinity thereof, the white light refracted (reflected) by the inclined end face 23 is emitted to the lateral direction orthogonal to the longitudinal direction of the light guide 4. Here, since the light guide 4 is provided with the through hole 24, the amount of light per unit area refracted by the inclined end surface 23 increases. As a result, the inclined end face 23 appears to shine brightly from the outside.

In addition, the plurality of LEDs 3 are arranged on the same circumference on the same surface 14 a side of the substrate 14 at equal intervals, and the inclined end surface 23 is formed in a flat shape and an annular shape. The refracted white light is substantially equal in the circumference of the light guide 4. The white light emitted from the light guide 4 passes through the transparent enclosure 5 and is emitted to the external space.

According to the LED bulb 1 of the present embodiment, the light guide 4 is provided with the through hole 24 and the flat end surface 22 is formed in a size that covers the plurality of LEDs 3 and is close to the plurality of LEDs 3. In addition, almost all the amount of white light radiated from the plurality of LEDs 3 can enter the light guide 4 and be guided to the inclined end surface 23 side to be reflected and emitted in the lateral direction. The reflected light per unit area can be increased, and this has the effect that the inclined end face 23 can be seen brightly and have high brightness.

Further, the LED bulb 1 is attached to the heat radiating plate 10 attached to the end surface 9a of the other end 2b of the housing 2 so that the LED bulbs 1 are close to the plurality of LEDs 22. Therefore, the light guide 4 The light guide 4 can be easily attached to the end surface 9a side of the other end 2b of the housing 2 by allowing white light radiated from the plurality of LEDs 3 to be incident on, and thereby can be formed at low cost. Have Moreover, since the light guide 4 is provided with the through-hole 24, the moldability is improved, and thus the LED bulb 1 can be formed at a low cost.

In addition, in this embodiment, although the some attaching part 25 of the light guide 4 was provided in the outer surface 4a of the one end side 4c, you may provide not only in this but in the inner surface 4b of the one end side 4c. . In this case, the plurality of attachment portions 4 may be attached to the substrate 14 with, for example, wood screws, or may be attached to the heat sink 10 through the substrate 14. Alternatively, the light guide 4 may be fixed by hooking the mounting body on the mounting portion 25 on the one end side 4c, fixing the mounting body to the substrate 14 or the heat radiating plate 10 with screws, and pressing the mounting body with the mounting body. That is, the light guide 4 may be attached to the end surface 9 a side of the other end side 2 b of the housing 2 through the attachment portion 25.

Moreover, although LED3 used the package item, you may form using not only this but a LED bare chip. Further, the shape of the enclosure 5 may not be substantially bullet-shaped, and the shape is not limited as long as the other end side 5b is closed and the one end side 5a is opened. It may be. Moreover, the enclosure 5 may be formed with translucent glass. Further, the housing 2 of the present embodiment is not limited to a substantially truncated conical cylindrical shape that smoothly increases in diameter, and may be a cylindrical shape such as a cylinder or a square tube. The base 15 is not limited to an E-type base, and may be a plug-type base. Further, a reflecting means such as a reflecting film may be provided on the inclined end face 23 of the light guide 4.

Next, a second embodiment of the present invention will be described. The LED bulb 31 of the present embodiment is configured as shown in FIGS. That is, the LED bulb 31 is obtained by replacing the light guide 4 with the light guide 32 in the LED bulb 1 shown in FIG. 3 and 4, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.

The light guide 32 is formed in a regular square cylinder. Thereby, the flat end surface 22 is formed in a regular quadrangle in a top view as shown in FIG. The plurality of LEDs 3 are provided on the one surface 14a side of the substrate 14 so as to be equidistant on the circumference of the regular square. In FIG. 4, one LED 3 is arranged per side, but a plurality of LEDs 3 may be provided per side. The flat end face 22 is formed in a size that covers the plurality of LEDs 3 as described in FIG.

Further, the light guide 32 is formed in a V-shaped cutout portion 33 toward the one end side 32c in the longitudinal direction at a predetermined interval in the circumferential direction at the boundary between the inclined end surface 23 and the outer surface 32a. The notch 33 has a V-shaped bottom 33a positioned at the intersection 34 between the outer faces 32a and 32a of the regular square, and a V-shaped apex 33b positioned between the sides. Is formed. Further, as shown in FIG. 3, the notch 33 is formed so that the depths D1, D2 from the vertex 33b of the V-shaped bottom 33a are different.

According to the LED bulb 31 of the present embodiment, since the inclined end surface 23 is formed with the V-shaped cutout portion 33, the light on the inclined end surface 23 looks different in the circumferential direction, and an effect can be achieved. Have In particular, since the depths D1 and D2 of the bottom 33a of the notch 33 are different, the appearance of the light on the inclined end surface 23 is diversified. Further, since the bottom 33a of the notch 33 is positioned at the intersection 34 between the regular rectangular outer surfaces 32a and 32a, there is an effect that the appearance of the light on the inclined end surface 23 is not easily obstructed by the intersection 34.

In the present embodiment, the light guide 32 is not limited to a regular rectangular tube shape, but may be a polygonal tubular shape such as a regular hexagonal tubular shape or a regular octagonal tubular shape. Further, the notch 33 may be formed in the cylindrical light guide 4.

Next, a third embodiment of the present invention will be described. The LED bulb 41 of this embodiment is configured as shown in FIGS. 5 and 6. That is, the LED bulb 41 is obtained by replacing the light guide 32 with the light guide 42 in the LED bulb 31 shown in FIG. 5 and FIG. 6, the same parts as those in FIG. 3 and FIG.

The light guide 42 is formed in the same manner as the light guide 32 except that the shape of the other end side 42d is different. In the light guide 42, the inclined end face 23 is formed in a V shape in the circumferential direction, and as shown in FIG. 6, the crossing sides 44 and 44 on the diagonal in the top view become V-shaped vertices 43b and 43b. 45 and 45 are V-shaped bottom points 43a and 43a. That is, the inclined end surface 23 is formed in a V shape in which one of the adjacent intersecting sides 44 and 45 is the apex 53b and the other is the bottom point 43a in the intersecting sides 44 and 45 of the outer surfaces 42a and 42a having a regular square shape. Yes.

The inclined end surface 23 is formed in two V shapes in the circumferential direction of the light guide 42. In addition, although the depth D1 from the vertex 4a of the V-shaped bottom point 43a is the same in the circumferential direction as shown in FIG. 5 in this embodiment, it may be formed differently.

According to the LED bulb 41 of the present embodiment, the inclined end surface 23 is formed in a V-shape in which one of the adjacent intersecting sides 44 and 45 is the apex 53b and the other is the bottom point 43a in the circumferential direction of the light guide 42. Therefore, the V-shape can be easily formed in the circulation direction, and the light on the inclined end face 23 can be seen differently in the rotation direction, and various effects can be achieved.

Next, a fourth embodiment of the present invention will be described. The lighting fixture 51 of this embodiment is comprised as shown in FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The lighting fixture 51 is a lamp placed on an installation base 52 such as a desk or a shelf, and the base 15 of the LED bulb 1 shown in FIG. A light bulb socket 54 is provided as a socket to which is attached. The instrument main body 53 is attached to a mounting base 55 formed in an ashtray shape with a screw (not shown). The mounting base 55 has a flange portion 56 attached to the installation base 52 with a screw (not shown). That is, the mounting base 55 is fixed to the installation base 52.

The instrument body 53 is connected to a power cord 58 having a plug 57 at the tip. The plug 57 is inserted and connected to the socket 60 of the wiring cord 59. As a result, external power is supplied to the light bulb socket 54 via the power cord 58 and the like. The LED bulb 1 is attached to a bulb socket 54. The LED bulb 1 is turned on in response to an on / off operation of a wall switch (not shown). The white light emitted from the enclosure 5 illuminates the surrounding external space.

According to the lighting device 51 of the present embodiment, since the LED bulb 1 having a light emitting portion with high luminance that can be formed at low cost is provided, the running cost can be reduced and the radiant light that is dazzling like a conventional candle or bulb This has the effect of illuminating the external space.

In addition, the lighting fixture of this embodiment may be an embedded type, a hanging type, or a direct mounting type lighting fixture.

Further, the above-described embodiment of the present invention is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1,31,41 ... LED bulb, 2 ... Housing, 3 ... LED 4, 32, 42 ... Light guide, 5 ... Enclosure, 6 ... Lighting device, 15 ... Base, 22 ... Flat end surface, 23 ... Inclined End face 24 ... Through hole 25 ... Mounting part 51 ... Lighting fixture 53 ... Body body 54 ... Light bulb socket as socket

Claims (3)

A casing provided with a base on one end side; a plurality of LEDs provided on the end face side of the other end side of the casing; formed in a cylindrical shape for guiding the emitted light of the LED; A flat end surface on which the emitted light of the LED is incident on one end side, an inclined end surface that is inclined so that the emitted light guided to the other end side in the longitudinal direction can be reflected to the outer surface side, and the flat end surface on the cylindrical central axis and the A through-hole penetrating through the inclined end surface and a mounting portion on the one end side, and the end surface side on the other end side of the housing through the mounting portion so that the flat end surface is close to the plurality of LEDs A light guide attached to the enclosure; an enclosure attached to the other end of the housing so as to cover the light guide; provided in the housing and operated with power supplied through the base; And a lighting device for lighting the plurality of LEDs. ED light bulb. The light guide is formed in a polygonal cylindrical shape, and the inclined end surface has a V-shape in which one of the adjacent crossing sides is a vertex and the other is a bottom point at the crossing sides of the polygonal outer surfaces. The LED bulb according to claim 1, wherein the LED bulb is formed. A lighting fixture comprising: the LED bulb according to claim 1; and a fixture main body having a socket to which the base of the LED bulb is connected.