WO2012153443A1

WO2012153443A1 - Illumination light source

Info

Publication number: WO2012153443A1
Application number: PCT/JP2012/000486
Authority: WO
Inventors: 由雄真鍋; 甲斐　誠; 洋介藤巻; 堀内　誠
Original assignee: パナソニック株式会社
Priority date: 2011-05-12
Filing date: 2012-01-26
Publication date: 2012-11-15
Also published as: JP5385437B2; JPWO2012153443A1; JP2013080695A; JP5082026B1

Abstract

The purpose of the present invention is to provide an illumination light source that has favorable light distribution properties and is simple to assemble. An illumination light source (1) having one or a plurality of light-emitting modules (10) which serve as light sources accommodated in an outer enclosure (2) constituted by a cylindrical case (60) having an opening at the top, which is the illumination direction, and a globe (30) mounted above the case (60) so as to close the opening, wherein all of the light-emitting modules (10) within the outer enclosure (2) are disposed flat with the primary emission direction directed upwards; above the light-emitting modules (10) one or a plurality of optical members (80) for diffusing emitted light from the light-emitting modules (10) are disposed so that the emitted light attains a maximum luminosity at an emission angle in the range of 30° to 60° when it reaches an inner surface (32) of the globe (30).

Description

Lighting light source

The present invention relates to a light source for illumination using a light emitting module, and more particularly to a technology for improving light distribution characteristics.

2. Description of the Related Art In recent years, a bulb-shaped illumination light source using a light emitting module having a semiconductor light emitting element such as a light emitting diode (LED) as a substitute for an incandescent lamp has been widely used.

Such a light source for illumination has a problem that the light distribution characteristic is narrower than that of an incandescent lamp, because the light source is an LED with a narrow irradiation angle. Therefore, as shown in FIG. 21, in the illumination light source 900 described in Patent Document 1, the base 901 is an inverted pyramid from the first base portion 902 and a partial region of the upper surface of the first base portion 902. The first LED 904 is disposed on the upper surface of the first pedestal portion 902, and the second LED 905 is disposed on the upper surface of the second pedestal portion 903. When the second base portion 903 is projected from above onto the first base portion 902, the light emitting surface of the first LED 904 exists in the projection area, and the side surface of the second base portion 903 is the light reflecting surface 906 It is assumed that it has become With this configuration, the emitted light from the first LED 904 is reflected obliquely downward by the light reflecting surface 906, thereby compensating for the narrowness of the irradiation angle of the LED and realizing relatively good light distribution characteristics.

JP, 2010-86946, A

However, in the case of the illumination light source 900 described in Patent Document 1, the upper surface of the first base portion 902 and the upper surface of the second base portion 903 are the mounting surfaces of the LEDs, and the two mounting surfaces separately include the LED 904, Since the 905 has to be mounted, the assembling operation is more complicated than the case where the mounting surface of the LED is only one. That is, for example, when mounting LEDs using a robot, if all LEDs are arranged in a plane, setting in the height direction is unnecessary, but if two mounting surfaces having different heights are present This requires setting in the height direction to correspond to each height, resulting in complicated robot operation and reduced working speed.

The present invention has been made in view of the problems as described above, and it is an object of the present invention to provide a light source for illumination having good light distribution characteristics and easy assembly work.

An illumination light source according to the present invention includes an inside of an envelope including a cylindrical case having an opening on the upper side which is an illumination direction, and a glove attached to the upper side of the case so as to close the opening. A light source for illumination containing one or more light emitting modules as a light source, wherein all the light emitting modules in the envelope are flatly arranged with the main emission direction facing upward, At the upper side of the light emitting module, one or more diffuses the emitted light so that the light emitted from the light emitting module reaches the inner surface of the globe with maximum luminous intensity in the range of the emission angle of 30 ° to 60 ° The optical member of the present invention is disposed.

Since the light source for illumination according to the present invention has a configuration in which all the light emitting modules in the envelope are flatly arranged with the main emission direction facing upward, the mounting of the light emitting modules is easy, and hence the illumination The assembly work of the light source is simple. Furthermore, on the upper side of the light emitting module, one or more of the emitted light is diffused so that the light emitted from the light emitting module reaches the inner surface of the globe with maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. Because the above optical members are disposed, the light distribution characteristics of the illumination light source are excellent even if the light emitting module having a narrow irradiation angle is disposed in a plane.

Partially broken perspective view showing the illumination light source according to the first embodiment Sectional drawing which shows the light source for illumination which concerns on 1st Embodiment. Perspective view showing the circuit holder Schematic for explaining the aspect of diffusion of emitted light by an optical member A plan view for explaining a light emitting module and an optical member according to a first embodiment Light distribution curve for explaining the light distribution characteristic of the illumination light source according to the first embodiment Light distribution curve for explaining the influence of the height of the optical member on the light distribution characteristics of the light source for illumination Light distribution curve for explaining the influence of the outer diameter of the optical member on the light distribution characteristics of the illumination light source A plan view for explaining a light emitting module and an optical member according to a modification A plan view for explaining a light emitting module and an optical member according to a modification A plan view for explaining a light emitting module and an optical member according to a modification A plan view for explaining a light emitting module and an optical member according to a second embodiment A plan view for explaining a light emitting module and an optical member according to a third embodiment A plan view for explaining a light emitting module and an optical member according to a fourth embodiment Partially broken perspective view showing the illumination light source according to the fifth embodiment Sectional drawing which shows the light source for illumination which concerns on 5th Embodiment. An enlarged sectional view showing a portion surrounded by a two-dot chain line in FIG. A figure for explaining an optical member concerning a 6th embodiment Light distribution curve for explaining the light distribution characteristic of the optical member according to the sixth embodiment Sectional drawing for demonstrating the optical member which concerns on the modification of 6th Embodiment Cross section showing a conventional light source for illumination

Hereinafter, a light source for illumination according to an embodiment of the present invention will be described with reference to the drawings. The scale of members in each drawing is different from the actual one. Further, in the present application, the symbol “to” used to indicate a numerical range includes the numerical values at both ends thereof.

First Embodiment
[Schematic configuration]
FIG. 1 is a partially broken perspective view showing the illumination light source according to the first embodiment. FIG. 2 is a cross-sectional view showing the illumination light source according to the first embodiment. In FIG. 2, the alternate long and short dash line drawn along the vertical direction of the drawing shows the lamp axis J of the light source for illumination, and the upper side of the drawing is the upper direction which is the illumination direction of the illumination light source Below the light source.

As shown in FIGS. 1 and 2, the illumination light source 1 according to the first embodiment is an LED lamp that is a substitute for an incandescent lamp, and is provided with a light emitting module 10 as a light source and a light emitting module 10. Base 20, globe 30 covering light emitting module 10, circuit unit 40 for lighting light emitting module 10, circuit holder 50 accommodating circuit unit 40, case 60 covering circuit holder 50, circuit unit 40 and an optical member 80 for diffusing the light emitted from the light emitting module 10. The envelope 2 of the illumination light source 1 is configured of a glove 30 and a case 60, and the light emitting module 10 and the optical member 80 are accommodated in the envelope 2.

[Part configuration]
(1) Light Emitting Module As shown in FIG. 2, the light emitting module 10 is provided on the mounting substrate 11 so as to cover the mounting substrate 11, the semiconductor light emitting device 12 mounted on the mounting substrate 11, and the semiconductor light emitting device 12. The semiconductor light emitting module includes the sealed body 13 and is disposed on the lamp axis J. In the present embodiment, the semiconductor light emitting element 12 is an LED, and the light emitting module 10 is an LED module. However, the semiconductor light emitting element 12 may be, for example, an LD (laser diode). It may be a luminescent element).

The mounting substrate 11 is, for example, a substantially square plate shape (in plan view) when viewed from above (in plan view), and is attached to the upper surface 21 of the base 20. In the present application, looking from the upper side means looking at the lower side along the lamp axis J from the upper side, and in FIG. 2, for example, from the upper side to the paper lower side along the lamp axis J It is the meaning of looking at.

The semiconductor light emitting elements 12 are mounted on the upper surface of the mounting substrate 11, for example, in a total of 25 rows of 5 rows and 5 columns, and the semiconductor light emitting elements 12 are point symmetrical about the lamp axis J It is arranged flat. Each semiconductor light emitting element 12 is mounted in a posture in which each main emission direction is directed upward along the lamp axis J.

The number of semiconductor light emitting elements 12 is not limited to 25. For example, the number of semiconductor light emitting elements 12 may be one or plural other than 25. Further, the arrangement of the semiconductor light emitting elements 12 is not limited to a matrix, and may be arranged in an annular shape such as an annular shape. Furthermore, the attitude of the semiconductor light emitting element 12 is such that all the semiconductor light emitting elements 12 do not have to be directed upward along the lamp axis J direction, and a part is directed obliquely to the lamp axis J It may be mounted in an attitude, whereby controllability of light distribution is further improved, and more preferable light distribution can be obtained.

The sealing body 13 has, for example, a block shape, and seals all 25 semiconductor light emitting elements 12. The upper surface 13a of the sealing body 13 is a substantially square plane when viewed from above, and constitutes the upper side light emitting surface of the light emitting module 10. The upper surface 13a and the lamp axis J are orthogonal to each other at the center of the upper surface 13a. doing. The upper surface 13a and the lamp axis J do not necessarily have to be orthogonal to each other at the center of the upper surface 13a. However, in order to obtain uniform light distribution over the entire circumference around the lamp axis J, the upper surface 13a Preferably, they intersect at the center of and more preferably orthogonal.

The sealing body 13 is mainly made of a translucent material, but when it is necessary to convert the wavelength of light emitted from the semiconductor light emitting element 12 into a predetermined wavelength, the wavelength of the light of the translucent material is used. The wavelength conversion material is mixed to convert the For example, a silicone resin can be used as the translucent material, and phosphor particles can be used as the wavelength conversion material, for example.

In the present embodiment, semiconductor light emitting element 12 emitting blue light and sealing body 13 formed of a translucent material mixed with phosphor particles for wavelength converting blue light to yellow light are adopted. A part of the blue light emitted from the semiconductor light emitting element 12 is wavelength-converted to yellow light by the sealing body 13 and white light generated by mixing of unconverted blue light and converted yellow light is emitted. It is emitted from module 10.

The light emitting module 10 may be, for example, a combination of a semiconductor light emitting element emitting ultraviolet light and each color phosphor particle emitting light in three primary colors (red, green and blue). Furthermore, as the wavelength conversion material, a material including a semiconductor, a metal complex, an organic dye, a pigment, or the like, which absorbs light of a certain wavelength and emits light of a wavelength different from the absorbed light may be used.

(2) Base The base 20 is, for example, a substantially disc shape, and the upper surface 21 and the lower surface 22 are both substantially circular flat surfaces, and are orthogonal to the lamp axis J, respectively. The light emitting module 10 is disposed on the upper surface 21 of the base 20 in a plan view, and is fixed to the base 20 by, for example, screwing, bonding, and engagement. The upper surface 21 is not limited to a substantially circular shape, and may have any shape. Moreover, as long as the top surface 21 can arrange the light emitting module 10 in a plane, the whole does not necessarily have to be a plane. Furthermore, the lower surface 22 is not limited to a flat surface.

A pair of through holes 23 penetrating in the vertical direction is formed in the base 20, and the pair of wires 41 of the circuit unit 40 are led out to the upper side of the base 20 through the through holes 23. The wires 41 are respectively connected to the mounting substrate 11 of the light emitting module 10, whereby the light emitting module 10 and the circuit unit 40 are electrically connected.

The base 20 is made of, for example, a metal material, and as the metal material, for example, Al, Ag, Au, Ni, Rh, Pd, an alloy of two or more of them, an alloy of Cu and Ag, etc. can be considered. . Such a metal material has good thermal conductivity, so that the heat generated by the light emitting module 10 can be efficiently conducted to the case 60.

(3) Glove Glove 30, in the present embodiment, has a shape that simulates a bulb of A-type bulb which is a general bulb shape, and the opening side end 31 of the glove 30 is press-fit into the upper side opening of the case 60 Thus, the upper side opening 61 of the case 60 is attached to the upper side end 61 of the case 60 so as to close the upper side opening of the case 60 while covering the upper side of the light emitting module 10 and the optical member 80. In addition, the shape of the glove | globe 30 is not limited to the shape which imitated the bulb | bulb of a A-type light bulb, What kind of shape may be sufficient. In addition, the glove 30 may be fixed to the case 60 by an adhesive or the like.

The inner surface 32 of the globe 30 is subjected to a diffusion process for diffusing light emitted from the light emitting module 10, for example, a diffusion process using silica, a white pigment, or the like. The light incident on the inner surface 32 of the globe 30 passes through the globe 30 and is extracted to the outside of the globe 30. The maximum outer diameter W1 of the glove 30 is larger than the outer diameter W2 of the upper end 61 of the case 60. Therefore, the light extracted to the outside of the globe 30 can easily move downward and a larger light distribution angle can be obtained.

(4) Circuit Unit The circuit unit 40 is for lighting the semiconductor light emitting element, and includes the circuit board 42 and various

electronic components

43 and 44 mounted on the main surface 42 a of the circuit board 42. And. In FIG. 2, only some electronic components are denoted by reference numerals. The circuit unit 40 is accommodated in the circuit holder 50, and is fixed to the circuit holder 50 by, for example, screwing, bonding, and engagement.

The circuit board 42 is disposed such that its main surface is parallel to the lamp axis J. In this way, the circuit unit 40 can be stored more compactly in the circuit holder 50. The circuit unit 40 is disposed such that the heat-sensitive electronic component 43 is located on the lower side far from the light emitting module 10 and the heat-resistant electronic component 44 is located on the upper side closer to the light emitting module 10. In this way, the heat-resistant electronic component 44 is less likely to be thermally destroyed by the heat generated by the light emitting module 10.

The circuit unit 40 and the base 70 are electrically connected by

electrical wires

45 and 46. The electrical wiring 45 is connected to the shell portion 71 of the base 70 through the through hole 51 provided in the circuit holder 50. Further, the electrical wiring 46 is connected to the eyelet portion 73 of the base 70 through the lower opening 54 of the circuit holder 50.

(5) Circuit Holder The circuit holder 50 has, for example, a substantially cylindrical shape with both sides open, and is configured of a large diameter portion 52 and a small diameter portion 53. The large diameter portion 52 located on the upper side accommodates most of the circuit unit 40. On the other hand, a base 70 is externally fitted to the small diameter portion 53 located on the lower side, whereby the lower side opening 54 of the circuit holder 50 is closed. The circuit holder 50 is preferably made of, for example, an insulating material such as a resin.

Although the base 20 is located above the circuit holder 50, the upper end 55 of the circuit holder 50 and the base 20 are not in contact with each other, and a gap is provided. The outer surface 56 of 50 and the inner circumferential surface 62 of the case 60 are not in contact with each other, and a gap is provided. Therefore, the heat generated in the light emitting module 10 is difficult to propagate to the circuit holder 50 through the base 20 and the case 60, and the circuit holder 50 does not easily have a high temperature, so the circuit unit 40 is unlikely to be thermally destroyed.

FIG. 3 is a perspective view showing a circuit holder. A pair of rail grooves 57 for fixing the circuit board 42 of the circuit unit 40 to the circuit holder 50 is provided on the inner circumferential surface 52 a of the large diameter portion 52 of the circuit holder 50 so as to face each other. The pair of rail grooves 57 is for fixing the circuit unit 40 to the circuit holder 50 in a posture in which the circuit board 42 is parallel to the lamp axis J (see FIG. 2), that is, in a vertical posture. The rail groove 57 extends in the vertical direction along the inner circumferential surface 52 of the large diameter portion 52, and the circuit unit 40 is placed vertically when the side edges of the circuit board 42 are fitted into the pair of rail grooves 57. It is fixed by the posture of.

The pair of rail grooves 57 do not face each other across the lamp axis J, but face each other without sandwiching the lamp axis J. With respect to the lamp axis J, both rail grooves 57 are biased to one side It is arranged to be in position. In other words, when the inside of the large diameter portion 52 is divided into two spaces in an imaginary plane including the lamp axis J, both rail grooves 57 are arranged to be accommodated in one space. Therefore, when the circuit board 42 is fixed to the rail grooves 57, the circuit board 42 is not disposed on the lamp axis J, that is, at the central position of the large diameter portion 52, and is shifted to one side with respect to the lamp axis J. Be placed. Therefore, the inside of the large diameter portion 52 is divided by the circuit board 42 into a wide space on the one main surface 42 a side and a narrow space on the other main surface 42 b side. As a result, taller electronic components can be disposed on the one main surface 42 a side.

Each rail groove 57 is composed of a base portion 57a and a first wall portion 57b and a second wall portion 57c provided on the base portion 57a.

Each base portion 57a is an elongated portion extending in the vertical direction along the inner peripheral surface 52 of the large diameter portion 52, and bulges a part of the inner peripheral surface 52a of the large diameter portion 52 inward. It is formed by. The base portions 57a have long surfaces 57d facing each other, and the long surfaces 57d are kept parallel to each other in a cross section cut by a virtual plane orthogonal to the lamp axis J, and the long surfaces 57d are each The bottom surface of the rail groove 57 is configured.

The first wall 57 b and the second wall 57 c are provided upright on the long surface 57 d of the base 57 a along the long direction. The first wall portion 57b is erected on the long side of the long surface 57d far from the lamp axis J, and is erected on the long side of the long surface 57d near the lamp axis J The second wall portion 57c is located. The first wall portion 57b and the second wall portion 57c face each other, and constitute side surfaces of the rail groove 57.

The first wall portion 57b is formed over the entire longitudinal direction of the long surface 57d of the base portion 57a, and the height of the wall is low (the amount of protrusion from the long surface 57d is small) and the upper side portion 57e , And the lower side portion 57f having a high wall height (a large amount of protrusion from the long surface 57d). That is, in the first wall portion 57b, the height of the wall changes in two steps, and the wall is higher on the lower side than the upper side. The height of the wall of the first wall 57 b may be changed in three or more steps.

On the other hand, the second wall portion 57c is not formed over the entire longitudinal direction of the long surface 57d of the base portion 57a, and is formed only near the lower end portion of the long surface 57d. The area in which the second wall 57c is formed is narrower than the area in which the lower portion 57f of the first wall 57b is formed, and the lower side of the lower portion 57f and the second wall 57c face each other. However, the second wall portion 57c does not exist in the region facing the upper side of the lower side portion 57f. The second wall 57 c has the same height as the lower portion 57 f of the first wall 57 b.

In fitting the circuit board 42 into the rail groove 57, while the circuit board 42 is inclined obliquely to the rail groove 57, both lower corners of the circuit board 42 are abutted against the first wall portion 57b, and are abutted. In this state, while sliding the lower side corner portions downward along the first wall portion 57b, at the same time, the posture of the circuit board 42 is gradually raised to be parallel to the rail groove 57, and finally the first wall portion 57b The process is completed by fitting lower corner portions between the lower portion 57f and the second wall 57c, and further aligning the side edges of the circuit board 42 with the first wall 57b.

Since the upper end of the first wall portion 57b is located above the upper end of the second wall portion 57c in the extending direction of the rail groove 57, the rail groove 57 is inclined while the circuit board 42 is inclined. The lower corner portions of the circuit board 42 can be easily inserted into the rail groove 57. Further, when inserting the lower side corner portions of the circuit board 42 into the upper end of the rail groove 57, it is visually grasped which side the main surface 42a of the circuit board 42 should be directed to. easy.

In the first wall portion 57b, the height of the wall is lower at the upper side portion 57e than at the lower side portion 57f, so the

electronic components

43 and 44 of the circuit unit 40, the solder, etc. It is difficult to hit the first wall 57b. Therefore, the

electronic components

43 and 44 can be mounted in a wide range on the circuit board 42. Similarly, the second wall 57c is provided only at the minimum necessary for fixing the circuit board 42. Therefore, the

electronic components

43 and 44, solder and the like do not easily come in contact with the second wall 57c. The

electronic components

43 and 44 can be mounted in a wide range on the substrate 42.

The base portion 57 a is not necessarily required, and the rail groove 57 may have a configuration in which the first wall portion 57 b and the second wall portion 57 c are directly extended from the inner circumferential surface 52 of the large diameter portion 52. In that case, the rail groove 57 is configured by the first wall 57 b and the second wall 57 c.

The rail groove of the conventional circuit case has a pair of opposing wall portions provided in the same region in the extending direction of the rail groove, so the upper end portions of the wall portions are aligned, and the rail groove upper side It was not easy to insert the lower corners of the circuit board at the end. Therefore, the attachment work of the circuit unit was complicated.

However, in the circuit holder 50 according to the present embodiment, since the positions of the upper side end portions of the pair of opposing wall portions (the first wall portion 57 b and the second wall portion 57 c) are shifted, specifically, The upper end of the second wall 57c closer to the lamp axis J is positioned lower than the upper end of the first wall 57b farther from the lamp axis J Therefore, in a posture in which the circuit board 42 is inclined to the rail groove 57, the lower side corner portions of the circuit board 42 can be inserted into the upper end of the rail groove 57. Therefore, the fixing workability of the circuit unit 40 is easy. Further, since the height of the wall of the first wall portion 57b of the rail groove 57 is not constant but a step is provided, the

electronic components

43 and 44 of the circuit unit 40 and solder are formed in the portion where the height of the wall is lowered. Etc. are less likely to interfere with the first wall 57b.

(6) Case The case 60 has, for example, a substantially cylindrical shape which is open at both ends and reduced in diameter from the upper side to the lower side. The base 20 and the opening end 31 of the glove 30 are accommodated in the upper opening of the case 60, and the case 60 is fixed to the base 20 by caulking, for example. The case 60 may be fixed to the base 20 by pouring an adhesive into a space 63 surrounded by the case 60, the base 20, and the globe 30, for example.

The outer peripheral edge of the lower side end of the base 20 has a tapered shape in accordance with the shape of the inner peripheral surface 62 of the case 60. Since the tapered surface 24 is in surface contact with the inner circumferential surface 62 of the case 60, the heat transmitted from the light emitting module 10 to the base 20 is more easily conducted to the case 60. The heat generated by the semiconductor light emitting element 12 is conducted to the base 70 mainly through the base 20 and the case 60 and further through the small diameter portion 53 of the circuit holder 50, and from the base 70 to the lighting equipment (not shown) side Heat is dissipated.

The case 60 is made of, for example, a metal material, and the metal material may be, for example, Al, Ag, Au, Ni, Rh, Pd, an alloy of two or more of them, or an alloy of Cu and Ag. Such a metal material has good thermal conductivity, so the heat transmitted to the case 60 can be efficiently transmitted to the base 70 side. In addition, the material of case 60 is not limited to a metal, For example, resin with high heat conductivity, etc. may be sufficient.

(7) Base A base 70 is a member for receiving power from the socket of the lighting apparatus when the illumination light source 1 is attached to the lighting apparatus and turned on. The type of the base 70 is not particularly limited, and examples thereof include an Edison type E26 base and an E17 base. The base 70 includes a shell portion 71 which has a substantially cylindrical shape and whose outer peripheral surface is an external thread, and an eyelet portion 73 attached to the shell portion 71 via an insulating portion 72. An insulating member 74 is interposed between the shell portion 71 and the case 60.

(8) Optical member The optical member 80 diffuses the emitted light so that the emitted light from the light emitting module 10 reaches the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. The light emitting module 10 is disposed on the upper side of the light emitting module 10. The emission angle is defined as 0 ° above the lamp axis J and 180 ° below the lamp axis J.

The optical member 80 is, for example, substantially columnar and disposed on the lamp axis J, and the column axis of the optical member 80 and the lamp axis J coincide with each other. The column axis of the optical member 80 does not have to be the same as the lamp axis J. However, in order to obtain uniform light distribution over the entire circumference around the lamp axis J, the column axis is a lamp It is preferable to be parallel to the axis J, and it is more preferable that the column axis and the lamp axis J coincide with each other.

The optical member 80 is formed, for example, of an outer portion 81 which is cylindrical and whose cylindrical axis is parallel to the lamp axis J, and a columnar inner portion 82 packed in the cylinder of the outer portion 81. More specifically, the optical member 80 has a cylindrical shape, and the outer side portion 81 has a cylindrical shape having a cylindrical axis coinciding with the lamp axis J, and the inner side 82 is tightly packed in the cylinder of the outer side 81 It has a cylindrical shape.

FIG. 4 is a schematic view for explaining an aspect of diffusion of outgoing light by the optical member. As shown in FIG. 4A, the upper surface 80 a of the optical member 80 is composed of the upper surface 81 a of the outer side portion 81 and the upper surface 82 a of the inner side portion 82. The lower surface 80 b of the optical member 80 is composed of the lower surface 81 b of the outer side portion 81 and the lower surface 82 b of the inner side portion 82. The upper surface 80a and the lower surface 80b of the optical member 80 are each flat.

The upper surface 80a and the lower surface 80b of the optical member 80 are not limited to flat surfaces. For example, the degree of diffusion of light emitted from the optical member 80 may be adjusted by setting the upper surface 80a of the optical member 80 as a concave surface such as a conical surface or a convex surface such as a conical surface. The lower surface 80b of the optical member 80 is a flat surface so that a gap can not be easily formed between the lower surface 80b and the upper surface 13a of the sealing body 13 from the viewpoint that the outgoing light from the light emitting module 10 is easily incident into the optical member 80. Is preferred.

An outer peripheral surface 80 c of the optical member 80 is constituted by an outer peripheral surface 81 c of the outer side portion 81. The outer peripheral surface 81 c of the outer portion 81 may be subjected to mirror surface processing. In this way, light can be prevented from entering the optical member 80 from the outer peripheral surface 80c. As a method of mirror-finishing the outer peripheral surface 81c, for example, it is considered to form a reflective film such as a metal thin film or a dielectric multilayer film by a method such as a thermal evaporation method, an electron beam evaporation method, a sputtering method or plating. Be

The inner peripheral surface 81 d of the outer portion 81 is in contact with the entire outer surface 82 c of the inner portion 82, and there is no gap between the outer portion 81 and the inner portion 82. That is, the inner peripheral surface 81 d of the outer side portion 81 and the outer peripheral surface 82 c of the inner side portion 82 are the same surface, and the interface between the outer side portion 81 and the inner side portion 82. There may be a gap between the outer side portion 81 and the inner side portion 82, but if there is a gap, light loss will occur, so it is preferable that there is no gap.

FIG. 5 is a plan view for explaining the light emitting module and the optical member according to the first embodiment. As shown in FIG. 5, the optical member 80 is smaller than the upper surface 13 a of the sealing body 13 of the light emitting module 10 as viewed from above. That is, the areas of the upper surface 80 a and the lower surface 80 b of the optical member 80 are smaller than the area of the upper surface 13 a of the sealing body 13. In this way, the entire upper surface 13 a of the sealing body 13 is not hidden by the optical member 80. That is, part of the upper surface 13a can be exposed. Therefore, as shown by an optical path L1 in FIG. 4A, a part of the emitted light from the light emitting module 10 can be directly delivered to the inner surface 32 of the glove 30 without being incident into the optical member 80.

The area of the area hidden by the optical member 80 on the upper surface 13a of the sealing body 13 is preferably 40% to 78% of the entire area of the upper surface 13a. In the present embodiment, the outer diameter (which is also the outer diameter of the outer portion 81) R1 of the optical member 80 is 15 mm, and the length W3 of one side of the upper surface 13a of the sealing body 13 is 21 mm. The area of is 40% of the area of the entire top surface 13a.

If the outer diameter R1 of the optical member 80 and the length W3 of one side of the upper surface 13a of the sealing body 13 are the same, the optical member 80 is simply disposed so as not to protrude from the upper surface 13a. The column axis of the member 80 can be aligned with the lamp axis J, and the positioning of the optical member 80 is easy.

The height (length in the vertical direction) T of the optical member 80 shown in FIG. 2 is 15 mm, and the outer diameter R2 of the inner portion 82 shown in FIG. 5 is 10 mm. The outer diameter R2 of the inner portion 82 is uniform over the entire vertical direction.

Referring back to FIG. 4, the optical member 80 is disposed at a position where the entire optical member 80 overlaps the upper surface 13 a of the sealing body 13 when viewed from the upper side. In this way, the entire lower surface 80 b of the optical member 80 contacts the upper surface 13 a of the sealing body 13, and thus the light emitted from the light emitting module 10 can be efficiently incident into the optical member 80.

The outer side portion 81 and the inner side portion 82 are each made of a translucent material. However, the material of the inner portion 82 has a lower refractive index than the material of the outer portion 81. As a translucent material which comprises the outer side part 81 and the inner side part 82, resin materials, such as a silicone and a polycarbonate, glass, a ceramic, etc. are mentioned, respectively. For example, it is conceivable that the outer part 81 is made of glass having a refractive index of 1.50 and the inner part 82 is made of silicone having a refractive index of 1.41.

A light scatterer may be included in one or both of the outer side portion 81 and the inner side portion 82 for internally scattering the incident light. As the light scatterer, for example, colorless and transparent or colored and transparent particles composed of silica, alumina, zinc oxide, titania or the like can be considered. The shape of the particles may be, for example, a substantially spherical shape, and the diameter is preferably in the range of 0.1 μm to 40 μm in situ. The amount of the light scatterer added is preferably in the range of 10 wt% to 60 wt%.

The light emitted from the upper surface 13a of the sealing body 13 of the light emitting module 10 and incident from the lower surface 81b of the outer portion 81 into the outer portion 81 is the outer periphery of the outer portion 81 as shown by the light path L2 in FIG. The reflection is repeated between the surface 81 c and the inner peripheral surface 81 d, and the light is emitted from the upper surface 81 a of the outer portion 81 to the outside of the optical member 80. The light is reflected by the outer peripheral surface 81 c because the material of the outer portion 81 has a refractive index higher than that of air, and the light is reflected by the inner peripheral surface 81 d because the material of the outer portion 81 is the inner portion This is because the refractive index is higher than that of the 82 material. As described above, the light that has entered the outer portion 81 once is unlikely to leak to the outside from the outer peripheral surface 81c or the inner peripheral surface 81d, and thus is guided to the upper surface 81a and emitted from the upper surface 81a.

On the other hand, light emitted from the upper surface 13a of the sealing body 13 of the light emitting module 10 and entering the inner portion 82 from the lower surface 82b of the inner portion 82 is repeatedly reflected between the opposing outer peripheral surfaces 82c of the inner portion 82. The part is emitted from the upper surface 82a of the inner part 82 to the outside of the optical member 80 as shown by the optical path L3 in FIG. 4A, but the rest is the outer peripheral surface of the inner part 82 as shown by the optical paths L4 and L5. The light passes through 82 c (the inner peripheral surface 81 d of the outer portion 81) and enters the outer portion 81. The light is not reflected by the outer circumferential surface 82 c but transmitted through the outer circumferential surface 82 c because the material of the inner portion 82 is lower than the refractive index of the material of the outer portion 81.

The light incident from the inner portion 82 into the outer portion 81 is repeatedly reflected between the outer peripheral surface 81 c and the inner peripheral surface 81 d of the outer portion 81 and, as shown by the light path L 3, the optical member 80 from the upper surface 81 a of the outer portion 81. Outgoing. As described above, light incident on the optical member 80 is collected at the outer portion 81 formed of a material having a higher refractive index, and is mainly emitted from the upper surface 81 a of the outer portion 81.

Further, the light emitted from the upper surface 81a of the outer portion 81 is not mainly emitted upward along the lamp axis J, but is emitted mainly at an emission angle in the range of 30 ° to 60 ° with respect to the lamp axis J Be done. The reason why the emission angle does not become 0 ° but does not become 0 ° is that most of the light incident in the outer part 81 does not travel straight along the lamp axis J in the outer part 81 and in the outer part 81 It is because it advances while internally reflecting in a zigzag. In particular, light collected from the inner part 82 to the outer part 81 enters the outer part 81 at an angle not parallel to the lamp axis J, and therefore travels in a zigzag in the outer part 81. The light traveling in the zigzag direction does not go straight in the direction along the lamp axis J even after being emitted from the upper surface 81a, but goes in the diagonally upward direction inclined with respect to the lamp axis J. Since there are a large amount of emitted light directed obliquely upward, the light is emitted mainly at an emission angle in the range of 30 ° to 60 ° with respect to the lamp axis J as a whole.

As shown in FIG. 4B, the light emitted from the light emitting module 10 is diffused by the optical member 80 so as to reach the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. Ru. Therefore, more light will reach the lower region of the inner surface 32 of the globe 30, and the light distribution angle of the illumination light source 1 is broadened. The light that has reached the globe 30 is further diffused by the globe 30.

In order to obtain a wide light distribution angle, it is preferable that the upper surface 80 a of the optical member 80 be positioned above the upper end 61 of the case 60 in the direction along the lamp axis J. Furthermore, it is more preferable that the upper surface 13 a of the sealing body 13 be positioned above the upper side end 61 of the case 60 in the direction along the lamp axis J.

From the above, even if the light emitting module 10 having a narrow irradiation angle is disposed on a plane, the light source 1 for illumination can expand the irradiation angle by the optical member 80, so the light distribution characteristic is excellent. Further, since the outer portion 81 is cylindrical and exists over the entire outer periphery of the optical member 80, the irradiation angle can be expanded over the entire periphery centering on the lamp axis J, The light distribution characteristic is good throughout.

[Light distribution characteristic of light source for illumination]
FIG. 6 is a light distribution curve diagram for explaining light distribution characteristics of the illumination light source according to the first embodiment. As shown in FIG. 6, the light distribution curve represents the magnitude of the luminous intensity in each direction of 360 ° including the vertical direction of the illumination light source 1, and the upper side of the illumination light source 1 along the lamp axis J is shown. Clockwise and counterclockwise, tick marks are formed at intervals of 10 ° with 0 ° and 180 ° downward along the lamp axis J, respectively. The scale in the radial direction of the light distribution curve represents the light intensity, and the light intensity is represented by a relative magnitude with the maximum value in each light distribution curve as 100%.

The dashed-two dotted line in FIG. 6 shows the light distribution curve A of an incandescent lamp. The broken line indicates a light distribution curve B when the globe 30 and the optical member 80 are removed from the illumination light source 1 according to the first embodiment. An alternate long and short dash line indicates a light distribution curve C when the optical member 80 is removed from the illumination light source 1 according to the first embodiment. A thick solid line indicates a light distribution curve D when the globe 30 is removed from the illumination light source 1 according to the first embodiment. A thin solid line indicates a light distribution curve E of the illumination light source 1 according to the first embodiment.

The light distribution characteristics were evaluated based on the light distribution angle. The light distribution angle refers to the size of an angular range in which a light intensity of half or more of the maximum value of the light intensity in the illumination light source is emitted. In the case of the light distribution curve shown in FIG. 6, it is the magnitude | size of the angle range which becomes 50% or more in luminous intensity.

As shown in FIG. 6, the light distribution angle of the light distribution curve A is about 310 °, the light distribution angle of the light distribution curve B is about 120 °, and the light distribution angle of the light distribution curve C is about 240 ° The light distribution angle of the light distribution curve D is about 170 °, and the light distribution angle of the light distribution curve E is about 285 °.

It can be understood by comparing the light distribution curve B and the light distribution curve D how the light distribution curve changes depending on the presence or absence of the optical member 80 in the state without the glove 30. As can be seen from the light distribution curve B, the maximum light intensity is obtained at an exit angle of 0 ° when there is no optical member 80, while the light emission angle is 40 ° when there is an optical member 80, as seen from the light distribution curve D. Maximum brightness at the From this, it can be seen that the light emitted from the light emitting module 10 is diffused by the optical member 80 and the light distribution angle is spread.

It can be understood by comparing the light distribution curve C with the light distribution curve E how the light distribution curve changes depending on the presence or absence of the optical member 80 in the state where the glove 30 is attached. As can be seen from the light distribution curve C, the light distribution angle is 240 ° when the optical member 80 is not present, while the light distribution angle is 285 when the optical member 80 is present as seen from the light distribution curve E. Spreads to °. As described above, it was confirmed that the light distribution angle spreads and the light distribution characteristic is improved by installing the optical member 80.

Furthermore, when the light distribution curve A and the light distribution curve E are compared, it can be seen that the light distribution characteristic of the illumination light source 1 according to the first embodiment has a light distribution characteristic more similar to an incandescent lamp.

It is preferable that the light emitted from the light emitting module 10 reaches the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 ° by the optical member 80. If the exit angle is less than 30 °, the spread of the light distribution angle is not sufficient, and good light distribution characteristics can not be obtained. If the exit angle exceeds 60 °, the amount of light directed upward along the lamp axis J And the upper part becomes dim.

Next, it investigated about the influence which the height and outer diameter of an optical member give to the light distribution characteristic of the light source for illumination. FIG. 7 is a light distribution curve diagram for explaining the influence of the height of the optical member on the light distribution characteristics of the illumination light source. FIG. 8 is a light distribution curve diagram for explaining the influence of the outer diameter of the optical member on the light distribution characteristics of the illumination light source.

The height T of the optical member 80 was fixed at 22 mm, and various changes were made to the outer diameter R1 of the optical member 80 to confirm the light distribution characteristics of the illumination light source 1. As shown in FIG. The light distribution angle for 5 mm (outer diameter R2 is 4 mm) is 175 °, the light distribution angle for outer diameter R1 is 10 mm (outer diameter R2 is 9 mm) is 210 °, and outer diameter R1 is 15 mm (outer diameter R2 is The light distribution angle in the case of 14 mm was 230 °. From this result, it is preferable that the light distribution characteristic is better as the outer diameter R1 of the optical member 80 is larger, as long as it does not protrude at least from the upper surface 13a of the sealing body 13 (if it is smaller than the length W3 of one side of the upper surface 13a). It is guessed. And if outer diameter R1 is 5 mm or more, about 180 degrees of light distribution angles are realizable.

Further, when the outer diameter R1 of the optical member 80 is fixed to 10 mm (the outer diameter R2 is 9 mm) and various changes are made to the height T of the optical member 80 to confirm the light distribution characteristics of the illumination light source 1, FIG. As shown in the figure, the light distribution angle when the height T is 22 mm is 205 °, the light distribution angle when the height T is 25 mm is 235 °, and the light distribution angle when the height T is 35 mm is 230 °, The light distribution angle was 235 ° when the height T was 45 mm. From this result, it was found that the height T of the optical member 80 had little influence on the light distribution characteristic.

The results shown in FIG. 6, FIG. 7, and FIG. 8 are different from each other in the experimental system (the positional relationship between the optical member 80 and the globe 30 is different, etc.). Even, the comparison of light distribution angles between different experimental systems is not effective.

[Modification of First Embodiment]
The following configuration is given as a modification of the illumination light source 1 according to the first embodiment. The same reference numerals as in the first embodiment are used for the same members as in the first embodiment.

The optical member 80 according to the first embodiment is substantially cylindrical, but the optical member according to the present invention is not limited to substantially cylindrical. For example, as shown in FIG. 9, it may be an approximately square prism-shaped optical member 180 configured by a substantially square tubular outer portion 181 and a substantially prismatic inner portion 182. Moreover, it may be columnar other than substantially cylindrical shape and substantially regular square prism shape, and shapes other than columnar shape may be sufficient. However, making the optical member cylindrical is a preferred example for achieving uniform light distribution over the entire circumference centered on the lamp axis J.

In the light emitting module 10 according to the first embodiment, the upper surface 13a of the sealing body 13 serving as the upper side light emitting surface is substantially square, but the upper surface of the sealing body according to the present invention is not limited to substantially square. For example, as shown in FIG. 10, the upper surface 213a of the sealing body 213 of the light emitting module 210 may be substantially circular with the center located on the lamp axis J. In this way, the lamp axis J and the center It is easy to obtain uniform light distribution over the entire circumference.

The optical member 80 according to the first embodiment is smaller than the upper surface 13a of the sealing body 13 of the light emitting module 10 when viewed from the upper side, but, for example, like the optical member 380 shown in FIG. In view of the above, it may be larger than the upper surface 13 a of the sealing body 13 of the light emitting module 10. In this way, the light emitted from the light emitting module 10 can be diffused further by the optical member 380, but the light emitted upward does not reach the inner surface 32 of the glove 30 directly, thus reducing the amount of light upward.

In the optical member 80 according to the first embodiment, the outer diameter R1 is uniform throughout the vertical direction, but may not be uniform. For example, the shape may be a drum shape in which the outer diameter is reduced (the outer diameter of the middle portion is reduced) in the middle portion in the vertical direction, and a substantially truncated cone shape in which the outer diameter R1 increases toward the lower side. It may be a substantially truncated cone shape in which the outer diameter R1 increases toward the upper side.

The optical member 80 according to the first embodiment includes the outer portion 81 and the inner portion 82 and has a two-layer structure in the radial direction, but may have three or more layers in the radial direction. Even in that case, if all the layers are formed of the translucent material and the refractive index of the translucent material is higher as the outer layer is, the emission light from the light emitting module 10 has an emission angle in the range of 30 ° to 60 °. And the emitted light can be diffused to reach the inner surface 32 of the globe 30 with the maximum luminous intensity.

Second Embodiment
FIG. 12 is a plan view for explaining the light emitting module and the optical member according to the second embodiment. As shown in FIG. 12, the illumination light source according to the second embodiment is different from the illumination light source 1 according to the first embodiment in that there are a plurality of light emitting modules 410 and a plurality of optical members 480. It is different. The other configuration is basically the same as that of the illumination light source 1 according to the first embodiment. Therefore, only the difference will be described in detail, and the description of the other components will be simplified or omitted. The same reference numerals as in the first embodiment are used for the same members as in the first embodiment.

The number of light emitting modules 410 is, for example, five, and is arranged on the upper surface 21 of the base 20 in a plane plane symmetrical with respect to the lamp axis J. Specifically, one light emitting module 410 is disposed on the lamp axis J and one on each of the four sides. As described above, even in the case where there are a plurality of light emitting modules 410, mounting on the base 20 is easy as long as the light emitting modules 410 are arranged in a plane. Each light emitting module 410 includes a mounting substrate 411, a semiconductor light emitting element (not shown), and a sealing body 413, and the size is different from that of the light emitting module 10 according to the first embodiment. It is the same.

The number of optical members 480 is also five, for example, and each includes an outer side portion 481 and an inner side portion 482, and the size is different from that of the optical member 80 according to the first embodiment. It is. In each optical member 480, the pillar axis of each optical member 480 is positioned at the center of the upper surface 413a of the sealing body 413 of each light emitting module 410 on the upper side of each light emitting module 410 in a one-to-one relationship with the light emitting module 410. To be arranged.

As described above, also in the configuration in which the plurality of optical members 480 are arranged in a one-to-one relationship with the plurality of light emitting modules 410, the emitted light from each light emitting module 410 is emitted at an emission angle of 30 ° by each optical member 480 The emitted light is diffused so as to reach the inner surface 32 of the globe 30 with the maximum light intensity in the range of ̃60 °, so the light distribution of the illumination light source even if the light emitting module 410 with a narrow illumination angle is arranged The characteristics are good.

Third Embodiment
FIG. 13 is a plan view for explaining the light emitting module and the optical member according to the third embodiment. As shown in FIG. 13, the illumination light source according to the third embodiment is different from the illumination light source 1 according to the first embodiment in that a plurality of optical members 580 are provided. The other configuration is basically the same as that of the illumination light source 1 according to the first embodiment.

The number of optical members 580 is, for example, five, and each of them is composed of an outer portion 581 and an inner portion 582. Each optical member 580 has substantially the same configuration as the optical member 80 according to the first embodiment. However, the outer diameter R1 is smaller than that of the optical member 80. The light emitting module 10 is disposed on the lamp axis J of the upper surface 21 of the base 20, and all the optical members 580 overlap the upper surface 13a of the sealing body 13 of the light emitting module 10 as viewed from above. They are arranged point-symmetrically with respect to the lamp axis J. Specifically, one optical member 580 is disposed such that the column axis thereof is positioned at the center of the upper surface 13 a of the sealing body 13, and the upper surface 13 a of the sealing body 13 with respect to the optical member 580. Four optical members 580 are disposed in four directions directed to the four corners of.

As described above, even when the plurality of optical members 580 are disposed on the upper side of one light emitting module 10, the light emitted from the light emitting module 10 is maximized in the range of the emission angle of 30 ° to 60 ° by the optical members 580 Since the emitted light is diffused so as to reach the inner surface 32 of the globe 30 as the luminous intensity, the light distribution characteristic of the light source for illumination is excellent even if the light emitting module 10 having a narrow irradiation angle is disposed in plane.

Fourth Embodiment
FIG. 14 is a view for explaining the light emitting module and the optical member according to the fourth embodiment, wherein (a) is a plan view and (b) is a sectional view taken along line AA in (a). As shown in FIG. 14A, the illumination light source according to the fourth embodiment is a first embodiment in that there are a plurality of light emitting modules 610 and there is one optical member 680 for them. This is different from the illumination light source 1 according to. The other configuration is basically the same as that of the illumination light source 1 according to the first embodiment.

For example, five light emitting modules 610 are arranged on the upper surface 21 of the base 20 so as to be plane-symmetrical about the lamp axis. Specifically, one light emitting module 610 is disposed on the lamp axis J and one on each of the four sides. As described above, even in the case where there are a plurality of light emitting modules 610, mounting on the base 20 is easy as long as the light emitting modules 610 are disposed flat. Each light emitting module 610 includes a mounting substrate 611, a semiconductor light emitting element (not shown), and a sealing body 613. The configuration is substantially the same as the light emitting module 10 according to the first embodiment. Less than.

The optical member 680 includes an outer portion 681 and an inner portion 682 and has substantially the same configuration as the optical member 80 according to the first embodiment, but the outer diameter R1 is larger than that of the optical member 80. The optical member 680 is disposed on the upper side of the light emitting module 610 with the column axis thereof aligned with the lamp axis J, and the upper surface 613a of the sealing body 613 of the light emitting module 610 disposed on the lamp axis J And covers approximately half of the top surface 613a of the sealing body 613 of each of the light emitting modules 610 arranged in the four directions on the lamp axis J side.

As shown in FIG. 14 (b), a light transmissive material such as a resin is filled in the gap 603 between the sealing bodies 613 of the adjacent light emitting modules 610, and the light emitted from each light emitting module 610 is optically The light is efficiently incident into the member 680.

Even in the case where one optical member 680 is disposed for a plurality of light emitting modules 610 in this manner, the optical members 680 make the light emitted from each light emitting module 610 have a maximum emission angle in the range of 30 ° to 60 °. Since the emitted light is diffused so as to reach the inner surface 32 of the globe 30 as light intensity, the light distribution characteristic of the light source for illumination is good even if the light emitting module 610 having a narrow irradiation angle is arranged in a plane.

Fifth Embodiment
FIG. 15 is a partially broken perspective view showing the illumination light source according to the fifth embodiment. FIG. 16 is a cross-sectional view showing the illumination light source according to the fifth embodiment. FIG. 17 is an enlarged sectional view showing a portion surrounded by a two-dot chain line in FIG.

As shown in FIGS. 15 and 16, the illumination light source 700 according to the fifth embodiment includes a light emitting module 710, a base 720, a globe 30, a circuit unit 40, a circuit holder 750, a case 60, a base 70, an optical member. 780 and a cap member 790. The same reference numerals as in the first embodiment are used for the same members as in the first embodiment.

As shown in FIG. 15, the light emitting module 710 is mounted so as to cover the substantially annular mounting substrate 711, a plurality of semiconductor light emitting devices 712 as light sources mounted on the mounting substrate 711, and the semiconductor light emitting devices 712. And a sealing body 713 provided on the substrate 711.

The mounting substrate 711 has a substantially circular hole 714 at the center, and a tongue piece 715 extends from one point on the inner peripheral edge toward the center of the hole 714. A connector 716 to which the wiring 41 of the circuit unit 40 is connected is provided on the lower surface of the tongue piece 715, and the light emitting module 710 and the circuit unit 40 are electrically connected by connecting the wiring 41 to the connector 716. It is connected (see FIG. 16).

For example, 32 semiconductor light emitting elements 712 are annularly mounted on the top surface of the mounting substrate 711. Specifically, 16 sets of semiconductor light emitting elements 712 arranged along the radial direction of the mounting substrate 711 are arranged in an annular shape, with 16 pairs at equal intervals along the circumferential direction of the mounting substrate 711 It is arranged. In the present application, the term "annular" includes not only annular, but also polygonal annular rings such as triangles, squares, and pentagons. Therefore, the semiconductor light emitting device 712 may be mounted in, for example, an elliptical or polygonal ring shape.

The semiconductor light emitting elements 712 are individually sealed by a substantially rectangular parallelepiped sealing body 713 for each set. Therefore, the number of sealing bodies 713 is 16 in all. The longitudinal direction of each sealing body 713 coincides with the radial direction of the mounting substrate 711, and when the lower side is viewed from the upper side along the lamp axis J (in plan view), the lamp axis J is the center It is arranged radially.

The base 720 is, for example, a substantially cylindrical shape having a substantially cylindrical through hole 721, and the cylinder axis of the base 720 is disposed in a posture in which it coincides with the lamp axis J. A light emitting module 710 is mounted on the upper surface 722 of the base 720 with the semiconductor light emitting elements 712 directed upward in the main emission direction. Since the through hole 721 is provided in the base 720, the illumination light source 700 is lightweight. Moreover, since a part of the circuit unit 40 is disposed in the through hole 721 and in the globe 30 via the through hole 721, the illumination light source 700 is compact.

The circuit holder 750 has, for example, a substantially cylindrical shape opened on both sides, and is constituted by a large diameter portion 752 penetrating the through hole 721 of the base 720 and a small diameter portion 753 to which the mouthpiece 70 is externally fitted. Be done. A bottomed cylindrical cap member 790 is attached to the upper end portion 755 of the large diameter portion 752, and the circuit unit 40 is accommodated inside the large diameter portion 752 and the cap member 790.

The circuit holder 750 is provided with a through hole 757 at a position corresponding to the tongue piece 715 of the light emitting module 710. The tip of the tongue portion 715 is inserted into the circuit holder 750 through the through hole 757, and the connector 716 provided on the tongue portion 715 is located in the circuit holder 750.

As shown in FIG. 17, the circuit holder 750 and the base 720 are not in contact with each other, and a gap is provided between the outer surface 756 of the circuit holder 750 and the peripheral surface 723 of the through hole 721 of the base 720. There is. Therefore, the heat generated in the light emitting module 710 is less likely to propagate to the circuit holder 750, and the circuit holder 750 is less likely to have a high temperature, so the circuit unit 40 is less likely to be thermally destroyed.

Returning to FIG. 16, the cap member 790 is a bottomed cylindrical tube that is closed at the upper side and opened at the lower side, and has an upper portion 791 with a gradually decreasing diameter toward the upper side and a cylindrical lower with uniform diameter in the vertical direction. The upper portion 791 is located in the glove 30, and the lower portion 792 is located in the through hole 783 of the optical member 780. A gap is provided between the lower portion 792 and the optical member 780. Therefore, the heat generated in the light emitting module 710 is not easily transmitted to the circuit holder 750 through the optical member 780, and the circuit holder 750 does not easily have a high temperature, so the circuit unit 40 is unlikely to be thermally destroyed.

The optical member 780 is a member for diffusing the emitted light so that the emitted light from the light emitting module 710 reaches the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. , And the upper side of the light emitting module 710.

The optical member 780 is, for example, a substantially frusto-conical shape having a substantially cylindrical through hole 783 at the center (a substantially frusto-conical shape whose outer diameter increases toward the upper side). The lamp axis J is also coincident with the central axis of the portion 781 and the inner portion 782). The central axis of the optical member 780 does not necessarily have to coincide with the lamp axis J, but in order to obtain uniform light distribution over the entire circumference around the lamp axis J, the central axis is a lamp The axis is preferably parallel to the axis J, and more preferably, the central axis and the lamp axis J coincide with each other.

The optical member 780 has an inner portion 782 having a substantially truncated conical shape (a substantially conical shape in which the outer diameter increases toward the upper side) having a substantially cylindrical through hole at the center, as shown in FIG. It is comprised by the lower part 782b of 782, and the outer side part 781 which covers the outer peripheral surface 782c. The outer side portion 781 and the inner side portion 782 are made of the same translucent material as the outer side portion 81 and the inner side portion 82 according to the first embodiment.

The upper surface 780 a of the optical member 780 is composed of the upper surface 781 a of the outer side portion 781 and the upper surface 782 a of the inner side portion 782. The lower surface 780 b of the optical member 780 is composed of the lower surface 781 b of the outer side portion 781. An outer peripheral surface 780 c of the optical member 780 is constituted by an outer peripheral surface 781 c of the outer side portion 781. There is no gap between the outer side 781 and the inner side 782.

The upper surface 780a and the lower surface 780b of the optical member 780 are planes orthogonal to the lamp axis J, respectively, and the outer peripheral surface 780c of the optical member 780 is a slope inclined with respect to the lamp axis J. The upper surface 780a and the lower surface 780b of the optical member 780 are not limited to flat surfaces, and for example, the upper surface 780a of the optical member 780 is emitted from the optical member 780 as a concave surface such as a conical surface or a convex surface such as a conical surface. The degree of diffusion of light may be adjusted. The lower surface 780 b of the optical member 780 to be in contact with the upper surface 713 a of the sealing body 713 is preferably a flat surface.

The light emitted from the sealing body 713 of the light emitting module 710 is incident from the lower surface 781 b of the outer portion 781 into the outer portion 781 and is further reflected by the outer peripheral surface 782 c of the inner portion 782 as shown by an optical path L6 in FIG. The light is repeatedly reflected internally in the outer side 781 and emitted from the upper surface 781a of the outer side 781 to the outside of the optical member 780.

The light emitted from the sealing body 713 of the light emitting module 710 enters the outer portion 781 from the lower surface 781 b of the outer portion 781 and further enters the lower surface 782 b of the inner portion 782 as shown by an optical path L7 in FIG. The light passes through the inner portion 782 and is emitted from the upper surface 782 a of the inner portion 782 to the outside of the optical member 780. For example, as shown by an optical path L8 in FIG. 17, the light is scattered in the inner portion 782 and is incident on the outer portion 781. The light incident on the outer side 781 repeats internal reflection in the outer side 781 and exits the optical member 780 from the upper surface 781 a of the outer side 781.

The light emitted from the sealing body 713 of the light emitting module 710 and reflected by the outer peripheral surface 781 c of the outer side portion 781 travels obliquely downward as shown by, for example, an optical path L9 in FIG. The outer peripheral surface 781 c of the outer side portion 781 may be subjected to mirror surface processing. In this way, it is possible to prevent light from entering the outer portion 781 from the outer peripheral surface 781 c. As a method of mirror-finishing the outer peripheral surface 781c, for example, it is considered to form a reflective film such as a metal thin film or a dielectric multilayer film by a method such as a thermal evaporation method, an electron beam evaporation method, a sputtering method or plating. Be

As described above, the light emitted from the light emitting module 710 is diffused by the optical member 780 so as to reach the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. Therefore, more light will reach the lower region of the inner surface 32 of the globe 30, and the light distribution angle of the illumination light source 700 is broadened. The light that has reached the glove 30 is further diffused by the glove 30. With such a configuration, the illumination light source 700 can realize a light distribution angle of 270 ° to 310 °. The light distribution angle when the optical member 780 was not present was about 220 °.

In order to obtain a wide light distribution angle, the upper surface 780a and the outer peripheral surface 780c of the optical member 780 are positioned above the upper end 61 of the case 60 in the direction along the lamp axis J. Is preferred. Furthermore, it is more preferable that the upper surface 713a of the sealing body 713 be positioned above the upper side end 61 of the case 60 in the direction along the lamp axis J.

Since the illumination angle of the light source 700 for illumination can be expanded by the optical member 780 even if the light emitting module 710 having a narrow illumination angle is disposed in a plane, the light distribution characteristic is excellent. In addition, since the outer side portion 781 exists over the entire outer periphery of the optical member 780, the irradiation angle can be extended over the entire periphery around the lamp axis J, and the light distribution characteristic over the entire periphery Is good.

Sixth Embodiment
FIG. 18 is a view for explaining an optical member according to a sixth embodiment, wherein (a) is a cross-sectional view, and (b) is a schematic view for explaining a diffusion mode of outgoing light by the optical member. It is. In FIG. 18B, members other than the optical member and the light emitting module are omitted.

As shown in FIG. 18A, the illumination light source 800 according to the sixth embodiment has a point in which the upper surface 880a and the lower surface 880b of the optical member 880 are not flat, and between the optical member 880 and the light emitting module 10. The light source 1 differs from the light source 1 for illumination according to the first embodiment in that a gap 801 is provided. The other configuration is basically the same as that of the illumination light source 1 according to the first embodiment.

The optical member 880 is a member for diffusing the emitted light so that the emitted light from the light emitting module 10 reaches the inner surface 32 of the globe 30 with the maximum luminous intensity in the range of the emission angle of 30 ° to 60 °. 18A, supported by a pair of supporting members 890 attached to the upper surface 21 of the base 20, and disposed above the light emitting module 10 in a state of being separated from the light emitting module 10, ing.

Each support member 890 includes a pedestal 891 screwed to the base 20, and a post 892 extended to the pedestal 891. The light emitting module 10 is fixed to the base 20 at the base end of the post 892 A hook-shaped fixing portion 893 is provided, and a grip portion 894 having a substantially U-shaped cross section for gripping and fixing the optical member 880 from above and below is provided at the tip of the support 892.

The optical member 880 has, for example, a cylindrical outer portion 881 whose cylindrical axis is parallel to the lamp axis J, and a columnar inner portion 882 packed in the cylinder of the outer portion 881. More specifically, the optical member 880 has a cylindrical shape, and the outer side portion 881 has a cylindrical shape having a cylindrical axis coincident with the lamp axis J, and the inner side 882 is tightly packed in the cylinder of the outer side portion 881. It has a cylindrical shape, and its column axis coincides with the lamp axis J.

As shown in FIG. 18B, the upper surface 880a of the optical member 880 is composed of the upper surface 881a of the outer side portion 881 and the upper surface 882a of the inner side portion 882. The lower surface 880 b of the optical member 880 is composed of the lower surface 881 b of the outer side portion 881 and the lower surface 882 b of the inner side portion 882. The upper surface 880a and the lower surface 880b of the optical member 880 are curved surfaces, respectively.

The outer side portion 881 and the inner side portion 882 are each made of a translucent material. However, the material of the inner portion 882 has a lower refractive index than the material of the outer portion 881. The light emitted from the upper side light emitting surface 13a of the light emitting module 10 and incident on the optical member 880 is collected at the outer portion 881 formed of a material having a higher refractive index, as shown by an optical path L10 in FIG. The light is emitted mainly from the upper surface 881 a of the outer side portion 881. The light emitted from the upper surface 881a of the outer portion 881 is not mainly emitted upward along the lamp axis J, but is emitted mainly at an emission angle in the range of 30 ° to 60 ° with respect to the lamp axis J. Be done.

The upper surface 880a of the optical member 880 is a light collecting surface that condenses light emitted from the inside of the optical member 880 through the upper surface 880a to the outside toward the top 33 of the globe 30. Specifically, the upper surface 880a has a concave surface shape which is recessed toward the light emitting module 10, and emits light on a cut surface (hereinafter referred to as "longitudinal surface") when cut by a virtual plane including the lamp axis J It has a substantially elliptical arc shape recessed to the module 10 side. The light emitted from the upper surface 880a of the optical member 880 converges on the top 33 of the globe 30, as shown by the optical path L11 in FIG. 18 (b). Therefore, the top 33 of the glove 30 can be brightened, and the light distribution characteristic can be further improved.

The lower surface 880 b of the optical member 880 is a reflecting surface that reflects part of the light emitted from the light emitting module 10 toward the skirt 34 of the glove 30. Specifically, the lower surface 880b has a convex curved surface shape that protrudes to the light emitting module 10 side, and has a substantially elliptical arc shape that bulges to the light emitting module 10 side in the longitudinal cross section. A part of the light emitted from the light emitting module 10 and incident on the lower surface 880b of the optical member 880 is reflected obliquely downward and reaches the skirt portion 34 of the glove 30, as shown by an optical path L12 in FIG. Therefore, the skirt 34 of the glove 30 can be brightened, and the light distribution characteristic can be made better.

A gap 801 is provided between the optical member 880 and the light emitting module 10. Since the optical member 880 is disposed apart from the light emitting module 10, the optical member 880 and the light emitting module 10 are not in contact with each other. Therefore, the lower surface 880b of the optical member 880 is not in contact with the upper side light emitting surface 13a of the light emitting module 10, and the lower surface 880b of the optical member 880 and the upper side light emitting surface 13a of the light emitting module 10 are separated. The light reflected by 880 b does not go to the light emitting module 10 or the base 20 and easily reaches the skirt 34 of the glove 30. In addition, since the optical member 80 is not in contact with the light emitting module 10, it is difficult for a load or stress to be applied to the upper side light emitting surface 13a of the light emitting module 10.

FIG. 19 is a light distribution curve diagram for explaining the light distribution characteristic of the optical member according to the sixth embodiment. When the light distribution characteristic of the optical member 880 according to the sixth embodiment is compared with the light distribution characteristic of the optical member 80 according to the first embodiment, as shown in FIG. It is the same in that the incident light reaches the inner surface 32 of the glove 30 with the maximum luminous intensity in the range of the output angle of 30 ° to 60 °. However, in the optical member 880 according to the sixth embodiment, since the upper surface 880a is a light collecting surface, the light intensity near the emission angle of 0 ° is higher than that of the optical member 80 according to the first embodiment. . Further, in the optical member 880 according to the sixth embodiment, since the lower surface 880b is a reflective surface, the light intensity near the emission angle of 90 ° is higher than that of the optical member 80 according to the first embodiment.

In the optical member 880 according to the sixth embodiment, the upper surface 880a is a light condensing surface, the lower surface 880b is a reflective surface, and a gap 801 is provided between the optical member 880 and the light emitting module 10. The configuration is not limited to the configuration that satisfies all three points, and it is sufficient to satisfy at least one of the three points.

FIG. 20 is a cross-sectional view for explaining an optical member according to a modification of the sixth embodiment. For example, in the example shown in FIG. 20A, the upper surface 880Aa of the optical member 880A is a flat surface and is not a condensing surface, but the lower surface 880Ab is a reflective surface. A gap 801A is provided. In this case, although it is not easy to collect light on the top portion 33 of the glove 30, light easily reaches the skirt portion 34 of the glove 30.

Further, in the example shown in FIG. 20 (b), the upper surface 880 Ba of the optical member 880 B is a condensing surface, but the lower surface 880 Bb is not a reflecting surface, and a gap 801 B is formed between the optical member 880 B and the light emitting module 10. Is provided. In this case, although it is easy to collect light on the top portion 33 of the glove 30, light does not easily reach the skirt portion 34 of the glove 30.

Further, in the example shown in FIG. 20C, in the optical member 880C, the upper surface 880Ca is a light collecting surface, the lower surface 880Cb is also a reflecting surface, and a gap 801C is also provided between the light emitting module 10 It is done. However, the optical member 880C is in contact with the light emitting module 10 near the lamp axis J, and there is no gap on the lamp axis J, and the gap 801C exists in the outer peripheral region of the lower surface 880Cb and the upper light emitting surface 13a Between the peripheral region of In this case, it is easy to collect light on the top 33 of the glove 30 and light can easily reach the skirt 34 of the glove 30. As described above, at least the outer peripheral region of the lower surface 880Cb of the optical member 880C is a reflective surface, and a gap 801C is provided between the outer peripheral region of the lower surface 880Cb of the optical member 880C and the upper light emitting surface of the light emitting module 10. If it is made, the emitted light from the outer peripheral region of the upper side light emitting surface 13a can be efficiently delivered to the skirt portion 34 of the glove 30. Further, it is possible to fix the optical member 880C to the light emitting module 10 at a position where the optical member 880C on the lamp axis J is in contact with the light emitting module 10.

The light collecting surface of the upper surface of the optical member is not limited to a substantially elliptical arc shape recessed on the side of the light emitting module 10 in the vertical cross section, as long as the light collecting surface can collect light on the top 33 of the globe 30. For example, as in an optical member 880D shown in FIG. 20 (d), the light collecting surface of the upper surface 880Da may be substantially V-shaped recessed toward the light emitting module 10 in the longitudinal cross section. Also in this case, the effect of brightening the top 33 of the glove 30 is achieved.

Furthermore, the reflecting surface of the lower surface of the optical member is not limited to the substantially elliptical arc shape projecting to the light emitting module 10 side in the longitudinal cross section, as long as the light easily reaches the skirt portion 34 of the globe 30. For example, as in an optical member 880D shown in FIG. 20 (d), the reflecting surface of the lower surface 880Db may have a substantially V shape protruding toward the light emitting module 10 in the vertical cross section. Also in this case, an effect of brightening the skirt portion 34 of the glove 30 is exerted.

In the optical member, the entire upper surface does not have to be a light collecting surface, and only a part of the upper surface may be a light collecting surface. For example, like the upper surface 880Ea of the optical member 880E shown in FIG. 20 (e), it is a plane that is not a light collecting surface near the lamp axis J, and an annular light collecting surface is formed in the outer peripheral region outside the plane. Also good.

Similarly, in the optical member, the entire lower surface does not have to be a reflective surface, and only a part of the lower surface may be a reflective surface. For example, as in the lower surface 880Eb of the optical member 880E shown in FIG. 20 (e), it is a plane that is not a condensing surface near the lamp axis J, and an annular reflective surface is formed in the outer peripheral region outside that plane. good. Also in this case, the light emitted from the outer peripheral region of the upper side light emitting surface 13a can be efficiently delivered to the skirt portion 34 of the glove 30.

Furthermore, the optical members may have different types of shapes of the light collecting surface on the upper surface and the reflecting surface on the lower surface. For example, as in an optical member 880F shown in FIG. 20 (f), the upper surface 880Fa has a substantially elliptical arc shape projecting toward the light emitting module 10 in the longitudinal cross section, but the lower surface 880Fb is a plane near the lamp axis J In addition, an annular light collecting surface may be formed on the outside of the flat surface, and the flat surface portion of the lower surface 880Fb may be fixed to the light emitting module 10.

<Others>
The configuration of the present invention has been described above based on the first to sixth embodiments and their modifications, but the present invention is not limited to the above embodiments. For example, the illumination light source may be configured by partially combining the configurations according to the first to sixth embodiments and the configurations according to the modifications thereof. In addition, the materials, numerical values, and the like described in the above-described embodiment only exemplify preferable ones, and are not limited thereto. Furthermore, it is possible to appropriately change the configuration of the illumination light source without departing from the scope of the technical idea of the present invention.

The present invention can be widely used in lighting in general.

1,700 light source for illumination 2

envelope

10, 210, 410, 610, 710 light emitting

module

13a, 213a, 413a, 613a, 713a upper side light emitting surface 30 globe 32 inner surface 33 top 34 skirt portion 60 case 61

upper side end

80, 180, 380, 480, 580, 680, 780

Optical member

80b,

780b Bottom surface

81, 181, 381, 481, 581, 681, 781

Outer portion

82, 182, 382, 482, 582, 682, 782 Inner portion

Claims

One or more light sources as light sources in an envelope constituted by a cylindrical case having an opening on the upper side which is an illumination direction, and a glove attached to the upper side of the case so as to close the opening. A light source for illumination in which a light emitting module is housed,
All of the light emitting modules in the envelope are flatly arranged with the main emission direction facing upward, and the emission angle of the light emitted from the light emitting modules is 30 ° to the upper side of the light emitting modules. One or more optical members for diffusing the emitted light are disposed to reach the inner surface of the globe at maximum light intensity in the range of 60 °.
The optical member has a cylindrical shape, and an outer portion whose cylinder axis is parallel to the lamp axis, and a columnar inner portion packed in the cylinder of the outer portion, and the outer portion is translucent The illumination light source according to claim 1, wherein the inner side portion is made of a material, and the inner side portion is made of a translucent material having a lower refractive index than the translucent material of the outer side portion.
The outer side portion is a cylindrical shape in which a cylinder axis coincides with a lamp axis, and the inner side portion is a cylindrical shape packed in a cylinder of the outer side portion without a gap. Light source for illumination.
4. At least a part of the lower surface of the optical member is a reflecting surface that reflects a part of the light emitted from the light emitting module toward the skirt of the glove. Lighting source for lighting.
At least a part of the upper surface of the optical member is a light collecting surface which condenses light emitted from the inside of the optical member through the upper surface to the outside toward the top of the globe. An illumination light source according to any one of claims 1 to 4.
The optical member is formed of an inner part which is frusto-conical and whose central axis is parallel to the lamp axis, and an outer part which covers the lower surface and the outer peripheral surface of the inner part, and the outer part is a translucent material The illumination light source according to claim 1, wherein the inner portion is made of a translucent material having a lower refractive index than the translucent material of the outer portion.
The said optical member is smaller than the upper side light emission surface of the said light emitting module seen from the upper side, and the said optical member is arrange | positioned in the position which overlaps with the said upper side light emission surface. The illumination light source according to any one of 1 to 6.
The illumination light source according to any one of claims 1 to 7, wherein the lower surface of the optical member is in surface contact with the upper side light emitting surface of the light emitting module.
The illumination light source according to any one of claims 1 to 7, wherein a gap is provided between the optical member and the light emitting module.
The illumination light source according to any one of claims 1 to 9, wherein the maximum outer diameter of the globe is larger than the outer diameter of the upper end of the case.
11. The light emitting module according to any one of claims 1 to 10, wherein one light emitting module is disposed on the lamp axis and one optical member is disposed on the lamp axis. The illumination light source described in.
The plurality of light emitting modules are disposed point-symmetrically with respect to a lamp axis, and the plurality of optical members are disposed in a one-to-one relationship above the light emitting modules. The illumination light source according to any one of claims 1 to 10, characterized in that
The light emitting module is one and disposed on the lamp axis, and the optical members are plural, and all the optical members are at positions overlapping with the upper side light emitting surface of the light emitting module when viewed from above The illumination light source according to any one of claims 1 to 10, wherein the light source is disposed.
11. The light emitting module according to claim 1, wherein a plurality of the light emitting modules are disposed point-symmetrically with respect to a lamp axis, and the one optical member is disposed on the lamp axis. The illumination light source according to any one of the above.