JP2012160666A - Light source module and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive light source module for a lighting device which has a wide light distribution range like that of an incandescent lamp and high light utilization efficiency.SOLUTION: A light-emitting diode (LED) module 10 comprises: an LED 110 which emits light; and a light direction conversion element 100 which radiates at least part of the emission light emitted from the LED 110 into a direction perpendicular to the front of the emission of the emitted light or obliquely rearward. An inclined surface 105 of the light direction conversion element 100 is inclined inward in its entirety so that the diameter of the light direction conversion element 100 reduces as the light direction conversion element 100 is further away from the LED 110.

Description

  The present invention relates to a light source module and an illumination device including the light source module.

  In recent years, awareness of environmental issues has increased, and the review of an illumination light source with high power consumption, such as an incandescent bulb, to an illumination light source with low power consumption, such as an LED, has become active. Since the LED is not only low power consumption but also an environment-friendly light source in terms of being mercury-free, there are an increasing number of cases where the LED is used as a replacement for the conventional light source.

  On the other hand, since the LED is a light source with high directivity, if the LED is replaced with the LED that emits light to the entire periphery like a conventional light source, the state of each irradiation surface will be greatly different. Therefore, in the case of using a light bulb using LED as a light source, it becomes a problem to improve the practicality by bringing the light distribution close to the incandescent light bulb. In order to solve such a problem, for example, Patent Document 1 describes an LED bulb in which a plurality of LEDs and a phosphor layer that diffuses light from the LEDs are formed. Patent Document 5 describes an LED lamp in which a plurality of LEDs are three-dimensionally installed.

  Although it is possible to widen the light distribution range by such a configuration, it not only impairs the aesthetics of the light bulb, but also has a demerit that the mounting cost becomes high due to the complicated structure. The following examples can be given as means for solving the above-described problems more easily without such disadvantages.

  In the first example, a highly diffusible resin or glass having a haze value close to 99% and a degree of dispersion of about 60 ° (an angle at which the relative transmittance becomes 50%) is used as the globe material. That is.

  The second example is, for example, using a small LED light source arranged so as to emit light laterally, and attaching a dome-shaped lens (dome-shaped lens) inside (for example, Patent Document 2). . In this example, after light is dispersed to some extent, a highly diffusible resin or glass is used as the glove material.

  The 3rd example is attaching the light guide which formed the reflective surface located in the top end side of a globe in the globe (light source cover) of a light bulb type lighting device (for example, patent documents 3). When the light emitted from the LED enters the light guide body, it repeats total reflection on the inner surface of the side peripheral surface of the light guide body and reaches the reflection plate located on the top end side, from the emission section near the reflection plate, behind, That is, it is emitted in the direction of the die.

  A fourth example is to emit light to a desired range by refracting and reflecting light using an optical lens, as shown in Patent Document 4 and Patent Document 6. For example, Patent Literature 4 describes an LED illumination device that includes a wavelength conversion member that converts the wavelength of light emitted from an LED and a lens that collects light emitted from the wavelength conversion member. Patent Document 6 describes a light source module having a light emitting element and a light direction changing element that emits light emitted from the light emitting element in a side surface direction. Patent Document 7 describes an optical element and a light-emitting device that suppress the occurrence of glare near the center point of a transparent member. When the light incident on the lens, the light redirecting element, or the optical element is incident at an angle greater than the critical angle at the boundary between the lens, the light redirecting element or the optical element and the air, the light is totally reflected and propagated at the same angle as the incident angle. .

JP 2001-243807 A (published September 7, 2001) JP 2004-343025 A (released on December 2, 2004) JP 2009-289697 A (released on December 10, 2009) JP 2010-129202 A (published on June 10, 2010) JP 2010-135308 A (released on June 17, 2010) JP 2010-239021 A (released on October 21, 2010) JP 2010-153328 A (published July 8, 2010)

  However, in the first example, due to the diffusibility of the globe, the light distribution range is expanded to, for example, a beam angle of about 160 °, but it is difficult to expand to the side or rear. If a material with a high degree of dispersion is used for the globe, the light distribution range is expanded compared to a material with a low degree of dispersion, but the material with a high degree of dispersion tends to have a low total light transmittance and a high light absorption rate. The decrease in (light utilization efficiency) is remarkable, for example, about 80%. That is, by attaching a glove made of a highly diffusive material to the first example, the light distribution range is expanded, but a loss of light flux is caused by about 20%. Thereby, since such a lighting fixture (illuminating device) becomes brightness lower than the brightness of a light source, fixture efficiency will become low.

  In order to expand the light distribution range without changing the material of the globe, it is necessary to enlarge the globe in order to emit light backward. However, if the glove is made extremely large, it will not be possible to replace the conventional light bulb, and it will not be possible to perform simple light bulb replacement.

  Moreover, in the thermal design of a light bulb-type lighting device, it is necessary to consider heat radiation from a housing portion generally made of a material such as aluminum. The housing portion is a member for fixing a light source such as an LED and accommodating a drive circuit for driving the light source, a power source for the drive circuit, and the like. A housing portion of a light bulb-type lighting device using a high-brightness LED module needs to have a large surface area in order to enhance the heat dissipation effect of heat generated from a light source or the like. In a bulb-type lighting device using such a casing, it is not practical to increase the size of the globe, since this increases the size of the bulb-type lighting device.

  In the second example, compared with the first example, the light distribution range can be expanded even if the globe is small. On the other hand, it is difficult to adjust the light distribution of the plurality of LEDs, and there is a problem that the instrument efficiency is low as in the first example.

  Further, the LED with a dome-shaped lens described in Patent Document 2 is a so-called bullet-type LED, and such an LED cannot be realized with a high-brightness LED from the viewpoint of heat dissipation. Thus, in order to realize a high-luminance light source using low-luminance LEDs, it is necessary to disperse a large number of LEDs, leading to a rise in price and deterioration in energy efficiency.

  In the third example, the reflecting surface (reflecting portion) is arranged so as to be positioned on the top end side of the globe from the midpoint when the distance from the spherical surface center of the light source cover to the top end of the globe (light source cover) is equally divided. It is installed. This is because if the distance between the reflecting surface and the casing is short, the range in which the light reflected by the reflecting surface is blocked by the casing is large. For this reason, in order to prevent the light emitted in the direction of the base from being blocked by the casing, it is necessary to ensure a sufficient distance by separating the reflecting surface from the casing. On the other hand, the inside of the light guide is solid rather than hollow. For this reason, if a sufficient distance from the casing is to be ensured, the weight of the light guide increases. Further, the portion of the light guide that guides light to the reflecting surface by repeating total reflection does not contribute to widening the light distribution range so that light is emitted in the direction of the base.

  Thus, in the third example, there is a wide light guide that does not contribute to extending the light distribution range, so the light distribution range is widened, but there is a possibility of increasing the size of the bulb-type lighting device. Is not practical.

  Moreover, the transparent acrylic resin generally used as a light guide has a transmittance of about 92% when the thickness is 15 mm, for example. That is, about 8% of the light is lost without being emitted. These lost lights may have been reflected without being incident before entering the light guide, or after being incident on the light guide and totally reflected inside the light guide. The light has been absorbed. When the reflective surface is installed away from the casing, that is, when the length of the light guide is increased and the reflective surface is brought closer to the top end side of the globe, the light incident on the light guide passes through the inside of the light guide. The distance traveled is longer. As a result, there is a problem that the light transmittance is further lowered, and the instrument efficiency is lowered.

  In the fourth example, as in Patent Document 4, for example, by contriving the shape of the lens, the light condensing property with respect to the front of the LED lighting device and the reduction in color unevenness are compatible. However, no consideration is given to the light distribution to the side or rear of the LED lighting device. The light redirecting element of Patent Document 6 is formed with a light reflecting surface for emitting incident light sideways, obliquely forward and obliquely backward, and further includes a light diffusing material in the light redirecting element. The combination of the configuration and the light reflecting surface makes the light diffusibility uniform and reduces luminance unevenness. As a result, since this light redirecting element diffuses light over the entire volume, it is feared that a huge amount of time will be spent in designing the shape using simulation. Moreover, since the light absorptance also becomes high compared with the case of only a transparent material, the fall of instrument efficiency will be caused.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a light source module of a lighting device that has a wide light distribution range, such as an incandescent bulb, is inexpensive, and has high light utilization efficiency. That is.

  In order to solve the above-described problems, a light source module according to the present invention includes a light emitting unit that emits light, and at least part of the emitted light emitted from the light emitting unit in a direction perpendicular to the emission front of the emitted light. Alternatively, in the light source module including the light direction changing element that radiates obliquely backward, the light direction changing element has an outer periphery of the light direction changing element so that the diameter of the light direction changing element becomes smaller as the distance from the light emitting portion increases. As a whole, the wall is inclined inward.

  According to the above configuration, the light direction changing element has an outer peripheral wall of the light direction changing element such that the diameter of the light direction changing element becomes smaller as the distance from the light emitting portion increases, for example, a truncated cone shape or a substantially truncated cone shape. It is inclined inward as a whole. Such a light direction changing element reflects a part of the light incident on the light direction changing element on the inner surface of the outer peripheral wall and advances the light in a direction perpendicular to the front of the emission or obliquely rearward. Alternatively, when the light reflected by the inner surface of the outer peripheral wall reaches the inner surface opposite to the inner surface and exits from the inner side to the outer side of the outer peripheral wall, the light path is directed to the emission front by refraction. And then change back diagonally. Therefore, the light redirecting element of the present invention can increase the amount of light emitted in the direction perpendicular to the front of the emission or in the oblique rear.

  The shape of the light direction changing element is not limited to the truncated cone shape and the substantially truncated cone shape. Moreover, the outer peripheral wall of such a light direction change element is not restricted to a plane, For example, the outer peripheral wall which is not a plane like a wave shape may be sufficient. In addition, the bus of such a light redirecting element is not limited to a straight line, but may be a part of an arbitrary curve such as a curve represented by a quadratic or higher order function, a hyperbola, or a curve represented by an exponential function. It may be a combination of arbitrary curves or straight lines. Thereby, the light source module has a wide light distribution range, and can irradiate light over a wider range.

  Moreover, since such a light direction change element employ | adopts the simple structure which inclines an outer peripheral wall as a whole inside, it is easy to design and can implement | achieve a light source module with high light utilization efficiency. .

  Further, the light direction changing element of the light source module according to the present invention is a reflecting surface that transmits at least a part of the emitted light emitted from the light emitting unit, and at least a part of the emitted light is transmitted to the inner surface of the outer peripheral wall. It is preferable to have a reflecting surface for reflecting toward the surface.

  By having such a reflection surface, the light reflected by the reflection surface reaches the inner surface of the outer peripheral wall, so that the light reaching the inner surface of the outer peripheral wall can be increased. As a result, the light radiated diagonally backward can be increased by the above-described refraction action. Thereby, the light source module can irradiate light over a wider range.

  The light direction changing element of the light source module according to the present invention further includes an incident surface on which the emitted light emitted from the light emitting unit is incident between the light emitting unit and the reflecting surface, Preferably, the shape is a concave shape, and the shape of the incident surface is a convex shape.

  In order to ensure the strength of the light redirecting element, it is necessary to secure a thickness of at least several millimeters (for example, 2 mm) between the incident surface and the reflecting surface. However, as the thickness of the light conversion element increases, the loss of light increases. In order to ensure the minimum thickness of the concave reflecting surface and to further reduce the thickness of the incident surface and the reflecting surface, it is suitable that the shape of the incident surface on which light is incident is a convex shape.

  According to the above configuration, the convex incident surface also has an optical function in which light emitted from the light emitting portion is refracted and concentrated forward. Thereby, the light incident on the light redirecting element can efficiently reach the reflecting surface. Further, since the thickness of the convex incident surface and the concave reflecting surface can be reduced, light loss can be reduced. Further, by reducing the thickness of the light redirecting element, it is possible to realize a reduction in size, weight, and cost reduction of the light redirecting element.

  In addition, the incident surface of the light source module according to the present invention further includes a concave portion for covering the light emitting portion, and the concave portion of the incident surface is a convex portion of the incident surface. You may provide so that it may surround.

  With such a configuration, the light can be incident on the light direction changing element regardless of the direction of the light emitted from the light emitting unit, and thus a light source module with higher light utilization efficiency can be realized. Can do.

  Further, the light direction conversion element of the light source module according to the present invention causes the light reaching the outer peripheral wall to pass in the direction toward the center of the light direction conversion element by the inner surface of the outer peripheral wall without passing through the reflection surface. It may be reflected.

  Further, the light direction conversion element of the light source module according to the present invention includes an inner surface of the outer peripheral wall positioned at a diagonal of the outer peripheral wall portion from which the light reflected in the direction toward the center of the light direction conversion element is reflected. And may be emitted obliquely rearward from the outer peripheral wall located at the diagonal.

  Light that reaches the outer peripheral wall without passing through the reflecting surface is reflected by the inner surface of the outer peripheral wall. The reflected light may include light totally reflected depending on the incident angle with respect to the inner surface. The direction of the reflected light is determined by the inclination of the outer peripheral wall. Thereby, a part of the light reflected by the outer peripheral wall is output to the outside from the reflecting surface, and a part of the light is obliquely rearward from the outer peripheral wall portion located diagonally to the outer peripheral wall portion where the light is reflected. Emitted.

  Thereby, the light source module has a wide light distribution range, and can irradiate light over a wider range.

  In addition, the reflection surface of the light source module according to the present invention may have a shape in which the inclination becomes horizontal as the distance from the center of the light emitting unit increases in the horizontal direction.

  Since the light incident on the reflection surface is inclined with respect to the optical axis as the distance from the light emitting unit is increased, the total reflection surface can be formed even when the inclination of the reflection surface is made closer to the horizontal. Thereby, light can be reflected more obliquely to the rear of the light direction conversion element.

  Moreover, it is preferable that the said light direction change element of the light source module in this invention is formed so that it may become circular cross section with respect to the emission front of the emitted light radiate | emitted from the said light emission part.

  With the above configuration, the light source module can uniformly distribute and emit light in each direction.

  Moreover, the said light direction change element of the light source module in this invention may have a bowl-shaped base part further.

  Moreover, the said base part in this invention may have a mechanism for fixing the said light direction change element.

  According to the said structure, the base part has a mechanism which fixes an optical direction change element by means, such as a screw and a nail | claw. Further, the base unit may have a mechanism for sandwiching and fixing a mechanism part for fixing the light emitting part and a mechanism part for hiding the wiring connected to the light emitting part. In this way, the light conversion element and the mechanical component can be fixed together, so that stability is increased.

  Moreover, the said light direction change element of the light source module in this invention may be comprised from the transparent material.

  Light loss due to passing through such a light redirecting element is reduced compared to a material containing diffusing particles, so that a light source module with high light utilization efficiency can be realized.

  Moreover, the light direction conversion element of the light source module according to the present invention may be subjected to a light diffusion process on a part or all of the surface thereof.

  According to the above configuration, the light source module can obtain uniform output light with high illuminance without separately providing a material with high light diffusibility.

  In addition, when such a light source module is applied to a lighting device, it is not necessary to consider the material of the globe, optical characteristics, and the like, so that an inexpensive lighting device can be realized.

  Moreover, LED may be sufficient as the said light emission part of the light source module in this invention.

  Thus, a light source module with low power consumption can be realized by using an LED with low power consumption for the light emitting portion.

  Moreover, the illuminating device provided with the light source module mentioned above is also contained in the technical scope of this invention.

  The light source module of the present invention includes a light emitting unit that emits light, and a light direction conversion that emits at least a part of the emitted light emitted from the light emitting unit in a direction perpendicular to or obliquely backward from the emission front of the emitted light. In the light source module including the element, the outer peripheral wall of the light direction changing element is inclined inward as a whole so that the diameter of the light direction changing element becomes smaller as the diameter of the light direction changing element becomes farther from the light emitting unit. It is characterized by that.

  Therefore, the light redirecting element of the present invention can increase the amount of light emitted in the direction perpendicular to the front of the emission or in the oblique rear. Further, the light source module has a wide light distribution range, and can irradiate light over a wider range. Moreover, since such a light direction change element employ | adopts the simple structure which inclines an outer peripheral wall as a whole inside, it is easy to design and can implement | achieve a light source module with high light utilization efficiency. .

It is a figure which shows the structure of the light source module in this invention. It is a figure which shows the outline of the lightbulb-shaped illuminating device containing the light source module of FIG. 1, (a) is a figure which shows the side view of a lightbulb-shaped illuminating device, (b) is a top view of a lightbulb-shaped illuminating device. FIG. It is the figure which showed an example of the light which passes the light source module of FIG. It is a light distribution curve figure of a LED part. It is a light distribution curve figure of the LED part which attached the glove. It is a light distribution curve figure of a light source module. It is a light distribution curve figure of the light source module which attached the glove. It is a figure which shows the other structure of the light source module in this invention. It is the figure which showed an example of the light which passes the light source module of FIG. It is a light source module light distribution curve figure when a light scattering process is performed to a part of surface of the light direction conversion element of the light source module of FIG. It is a light source module light distribution curve figure when the light-scattering process is performed to the whole surface of the light direction change element of the light source module of FIG. It is a figure which shows the example of the shape of a light source module.

[Embodiment 1]
An embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to this, and the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are within the scope of the present invention unless otherwise specified. Is not intended to be limited to that, but merely an illustrative example.

(Outline of the bulb-type lighting device 1)
An outline of a light bulb-type lighting device (lighting device) 1 of the present invention is shown in FIG. 2A and 2B are diagrams showing an outline of the bulb-type illumination device 1, wherein FIG. 2A shows a side view of the bulb-type illumination device 1, and FIG. 2B shows a top view of the bulb-type illumination device 1. FIG.

  As shown in FIG. 2, the bulb-type lighting device 1 includes an LED module (light source module) 10, a globe 11, a housing 12, a base 13, and a reflector 14.

  The globe 11 covers and protects the LED module 10 and transmits light emitted from the LED module 10. The globe 11 is made of, for example, a transparent resin such as polycarbonate (PC) or glass. The globe 11 may be formed of a light diffusing resin having a haze value of 99%. Further, the surface of the globe 11 may be processed with random and minute irregularities on the order of micrometers. The globe 11 processed in this way can diffuse light by a refraction action by the surface structure. The globe 11 is preferably formed in a spherical shape or a curved shape.

  The housing 12 has a substantially frustoconical shape. The base 13 is provided at one end of the smaller diameter of the housing 12, the globe 11 is provided at the other end, and the LED module 10 and the internal light are efficiently reflected. The reflector 14 is fixed. In the housing 12, the end fixing the reflector 14 may be formed flat for attaching the reflector 14 and the LED module 10.

  The housing 12 is a member for housing a drive circuit for driving the LED module 10 and a power source (not shown) that generates a DC bias applied to the drive circuit. The casing 12 further radiates heat generated from the drive circuit, the power source, and the LED module 10. In addition, the shape of the housing | casing 12 is an example and shapes other than a truncated cone shape may be sufficient.

  The base 13 is electrically connected to the drive circuit and has a spiral shape that is screwed into a socket connected to an external power source. The base 13 is provided at one end of the housing 12 having a smaller diameter.

  The reflector 14 is fixed to one end of the housing 12 having a larger diameter, that is, the end where the base 13 is not provided. The reflector 14 is a member for reflecting the reflected light of the globe 11 and the emitted light of the LED module 10. As shown in FIG. 2, the reflector 14 includes a substrate holder 141 for fixing an LED unit 110 (described later) of the LED module 10, an opening 142 for exposing the upper surface of the LED unit 110, and electrodes A wiring concealment 143 is provided on the upper surface of the reflector 14 so as to allow wiring from a driving circuit connected to 113 (described later) to pass therethrough.

  The height of the reflector 14 is configured to be substantially the same as the height of the LED unit 110. In addition, the height of the reflector 14 is an example and is not limited to this. Moreover, although the shape of the opening part 142 is a rectangular shape, for example, it is not limited to this.

  The LED module 10 includes a light direction conversion element 100 and an LED unit 110.

  The light direction changing element 100 radiates in a direction perpendicular to or obliquely backward with respect to the emission front of the emitted light by reflecting or refracting at least a part of the emitted light emitted from the LED unit 110. The light redirecting element 100 is made of a transparent material having a high transmittance, and is installed in the vicinity of the LED unit 110 that is a heat source of about 100 ° C., so that it has a high heat resistance, for example, polycarbonate (PC). It is preferable that it is formed by. Since the light loss caused by passing through the light redirecting element 100 is less than that of the material containing the diffusing particles, the LED module 100 with high light utilization efficiency can be realized.

  In addition, the light direction change element 100 is not limited to PC, For example, transparent resin, such as an acrylic resin represented by PMMA (polymethyl methacrylate), may be sufficient. Further, the temperature of the heat source of the LED unit 110 is not limited to this. The configuration of the light direction conversion element 100 will be described later.

  The LED unit 110 includes a light emitting unit 111 that emits light, a substrate 112 that fixes the light emitting unit 111, and an electrode 113 that supplies current to the light emitting unit 111. The LED unit 110 is formed on the housing 12.

  In the light emitting unit 111, a plurality of LEDs (not shown) are mounted at intervals, and are sealed with a resin containing a phosphor. Further, the light emitting unit 111 is fixed to the central portion on the substrate 112. In addition, the fixing place of the light emission part 111 is not limited to this. Thus, the LED module 10 with low power consumption can be realized by using the LED for the light emitting unit 111.

  The substrate 112 is formed in a rectangular shape, but the shape of the substrate 112 is not limited to this. The substrate 112 is formed on the housing 12. The board | substrate 112 is fixing the LED part 110 by being fitted with the board | substrate holding | maintenance 141 of the reflector 14. FIG.

  Next, the configuration of the light direction conversion element 100 will be described with reference to FIG.

(Configuration of the light direction changing element 100)
FIG. 1 is a diagram showing the configuration of the LED module 10, and is a cross-sectional view taken along line AA in FIG. As shown in FIG. 1, the light direction changing element 100 includes a light direction changing element main body 101 and a base part 102.

  The light direction changing element main body 101 is provided on the upper surface of the base portion 102, and the diameter of the light direction changing element main body 101 is away from the light emitting portion 111, that is, as it goes to the 0 ° direction in FIG. The inclined surface 105 of the light redirecting element main body 101 is formed so as to be inclined inward as a whole so that the diameter becomes smaller.

  The light redirecting element main body 101 has a convex incident surface (incident surface) 103, an output surface (reflective surface) 104, and an inclined surface (outer peripheral wall) 105.

  The convex incident surface 103 is provided between the LED unit 110 and the emission surface 104, and enters the emitted light emitted from the light emitting unit 111 of the LED unit 110. Specifically, the emitted light is incident, refracted, and concentrated in a straight traveling direction (0 ° direction) that is in front of the emitted light.

  The emission surface 104 has a concave shape. Specifically, the emission surface 104 has a shape such as a funnel shape or a morning glory shape, the inclination of which becomes closer to the horizontal as the distance from the center of the light emitting unit 111 increases in the horizontal direction. The emission surface 104 transmits at least part of the emitted light emitted from the light emitting unit 111. Further, the emission surface 104 reflects at least a part of the emitted light toward the inner surface of the inclined surface 105. Specifically, the exit surface 104 reflects in a 90 ° direction perpendicular to the 0 ° direction shown in FIG. 1 or in a direction inclined in a 180 ° direction from the 90 ° direction. The light reflected by the emission surface 104 may include totally reflected light. Whether or not the total reflection of light by the exit surface 104 is caused by a critical angle determined by the refractive index of the light direction conversion element 100 is set. The reflection direction of the light (reflected light) reflected by the exit surface 104 is determined by the exit surface. It is set by an inclination angle of 104.

  The inclined surface 105 refracts the reflected light reflected by the emission surface 104 and radiates it obliquely backward with respect to the emission front of the emission light. Further, the inclined surface 105 radiates the reflected light in the backward direction. Thereby, the reflected light is emitted to the outside of the light direction conversion element 100.

  The base part 102 is formed in a bowl shape or a leg shape. The base unit 102 has a concave incident surface (incident surface) 106 that is a concave portion for covering the light emitting unit 111. Similar to the convex incident surface 103, the concave incident surface 106 is incident with the emitted light emitted from the light emitting unit 111 of the LED unit 110. The concave incident surface 106 is provided so as to surround the convex incident surface 103.

  With such a configuration, since the light emitted from the LED unit 110 can enter the light direction conversion element 100 regardless of the direction, the LED module 10 with higher light utilization efficiency is realized. can do.

  Moreover, the base part 102 is formed in the surface facing the surface which is contacting the housing | casing 12 in the reflector 14. FIG. A surface of the base portion 102 that is in contact with the reflector 14 is referred to as a lower surface of the base portion 102, and a surface that faces the lower surface of the base portion 102 is referred to as an upper surface of the base portion 102.

  The concave incident surface 106 has a fixing hole 107 that is a mechanism for fixing the light direction conversion element 100. The fixing hole 107 can firmly attach the light direction changing element 100 and the reflector 14 to the housing 12 by inserting a screw 15 or the like, for example. Thus, the base part 102 has a mechanism for fixing the light direction conversion element 100 by means such as screws or claws.

  Further, the concave incident surface 106 has a mechanism for sandwiching and fixing a mechanism part for fixing the light emitting unit 111 and a wiring concealment 143 that is a mechanism part for concealing the wiring connected to the light emitting unit 111. In this way, the light direction changing element 100 and the mechanical component can be fixed together, so that the stability is increased.

  In addition, a concave shape (not shown) may be provided on the upper surface of the base portion 102 so that the surface of the spiral crest of the screw 15 and the upper surface of the base portion 102 have the same height. Moreover, it is preferable that the lower surface of the base portion 102 has a shape that can be fitted to the uneven shape (not shown) of the reflector 14.

(About the shape of the convex incident surface 103)
The shape of the convex incident surface 103 is a convex shape as shown in FIG.

  If the incident surface of the light redirecting element 100 is provided in a concave shape, the light incident from the incident surface is refracted and spreads. Therefore, the light that reaches and reflects the emission surface 104 decreases, and the light that goes directly to the inclined surface 105 increases. Thereby, the light intensity in the front oblique direction is increased, and the increase in the light intensity in the backward direction is reduced. In this case, if the height of the light redirecting element 100 viewed from the light emitting unit 111 is reduced and the radius is increased to make it difficult for light to reach the inclined surface 105, the light reflected on the emission surface 104 can be increased. The backward light intensity increases.

  On the other hand, the emission surface 104 is preferably provided at a position as high as possible when viewed from the LED unit 110 so that the housing 12 does not block light. This is because, by providing the emission surface 104 at a high position, even if the light is reflected by the emission surface 104 and emitted so as to be inclined backward, it can be emitted while avoiding the housing 12. .

  In the case where the incident surface of the light direction changing element 100 is concave, in order to increase the light reflected on the light emitting surface 104 in order to make the light emitting surface 104 of the light direction changing element 100 higher than the LED unit 110, The radius of the light redirecting element 100 needs to be increased. However, since the light direction changing element 100 is provided in the bulb-type lighting device 1 as shown in FIG. 2, the radius of the light direction changing element 100 is limited to the size of the bulb-type lighting device 1. . Therefore, the concave shape is not suitable for the incident portion of the light redirecting element 100 with a limited radius.

  Further, as shown in FIG. 1, when the shape of the emission surface 104 is concave, the light direction conversion element 100 has a hole directed from the 0 ° direction to the 180 ° direction. However, in order to ensure the strength of the light redirecting element 100, it is necessary to secure a thickness of at least several millimeters (for example, 2 mm) between the incident surface on which light is incident and the exit surface 104. However, as the thickness of the entrance surface and the exit surface 104 increases, the loss of light increases (for example, in the case of PMMA, the loss of light is 8% every 2 mm). Therefore, in order to ensure the minimum thickness between the incident surface and the exit surface 104 and to further reduce the thickness between the entrance surface and the exit surface 104, the shape of the incident surface on which light is incident is preferably convex or planar. It can be said that.

  Next, a case where the incident surface of the light direction conversion element 100 is planar will be considered. When the incident surface is flat, the thickness of the incident surface and the output surface 104 increases as it goes in the side surface direction, compared to the case where the incident surface is convex. As described above, since the loss of light increases as the thickness increases, it can be said that a convex shape is suitable for the shape of the incident surface on which light is incident.

  Thus, by making the shape of the convex incident surface 103 convex, the thickness of the convex incident surface 103 and the exit surface 104 can be reduced, so that light loss can be reduced. Further, by reducing the thicknesses of the convex incident surface 103 and the output surface 104, it is possible to reduce the size and weight, and further to reduce the price of the light redirecting element 100.

(Example of light emitted from LED module 10)
Next, the example of the emitted light of the LED module 10 is shown in FIG. FIG. 3 is a diagram illustrating an example of light passing through the LED module 10. As shown in FIG. 3, the light emitted from the LED unit 110 is emitted to the outside of the light direction conversion element 100 via the light direction conversion element 100. In FIG. 3, attention is particularly paid to the light emitted in the right direction of FIG.

  As shown in FIG. 3, the light emitted from the LED unit 110 is refracted at the convex incident surface 103 and changes the emission direction to the front direction. A part of the light reaching the emission surface 104 becomes the transmitted light 22 and the rest becomes the reflected light 23. The transmitted light 22 is light that is transmitted and emitted because part of the light emitted from the LED unit 110 is incident on the emission surface 104 at an incident angle that is less than the critical angle.

  The reflected light 23 is light that is reflected by the emission surface 104, guided in a 90 ° direction or an obtuse angle than the 90 ° direction, that is, a direction inclined in the 180 ° direction, and emitted from the inclined surface 105.

  Further, the reflected light 23 is reflected by a higher surface of the emission surface 104, so that the light blocked by the housing 12 can be reduced. Furthermore, by changing the inclination of the emission surface 104, the light can be concentrated in an arbitrary direction. Therefore, the emission surface 104 can control light distribution.

  The transmitted light 24 is light that enters the side surface of the concave incident surface 106, passes through the inclined surface 105, and exits in the 90 ° direction.

  The reflected light 25 is light that is incident from the convex incident surface 103, reaches the inclined surface 105 without passing through the output surface 104, and is reflected by the inner surface of the inclined surface 105 toward the center of the light direction conversion element 100. is there.

  The reflected light 25 is reflected in the direction toward the center of the light direction changing element 100 and then guided to the inner surface of the inclined surface 105 located diagonally to the portion of the inclined surface 105 where the light is reflected. It is light emitted diagonally backward from the inclined surface 105 located.

  The light shown in FIG. 3 is an example, and the light passing through the LED module 10 is not limited to this.

  The direction of the reflected light 25 is determined by the inclination of the inclined surface 105. For example, in the case of an inverted frustoconical optical lens having a larger diameter as it is farther from the light emitting unit 111 described in Patent Document 4, if light directly enters the inclined surface of the side surface of the optical lens, the light is reflected by the inclined surface. The beam angle is narrowed because the light is emitted in the 0 ° direction and the light intensity in the front direction increases.

  Therefore, by tilting the inclined surface 105 so as to increase the apex angle of the cone formed by extending the inclined surface 105, a part of the reflected light 25 is output to the outside from the output surface 104, and a part of the light is reflected. From the portion of the inclined surface 105 positioned diagonally to the inclined surface 105 portion, the output is performed obliquely rearward. Thereby, the light distribution range is expanded, and light can be irradiated to a wider range.

  As described above, the light emitted from the light direction changing element 100 is emitted sideways or behind the side. Further, the light traveling sideways or rearward like the reflected light 23, the transmitted light 24, and the reflected light 25 emitted from the light direction changing element 100 is further emitted backward due to the diffusion effect of the globe 11. In particular, light can be emitted in a wider range by increasing the height of the globe 11.

  Further, the light reflected by the emission surface 104 or the globe 11 and guided to the vicinity of the LED module 10 is further reflected by the reflector 14, so that the light can be efficiently taken out of the bulb-type lighting device 1.

(Comparison of light distribution range)
In the conventional bulb-type lighting device, light is emitted from the light emitting unit 111 of the LED unit 110 in all directions around the light emission front (0 ° direction), and the light intensity increases as it approaches the vertical direction from the light emission front. Will decline. That is, the light directed toward the 0 ° direction has the highest light intensity. Therefore, in the light bulb-type lighting device 1 according to the present invention, the light intensity is dispersed in all directions in order to widen the light distribution range.

  FIG. 4 is a light distribution curve diagram showing the light distribution characteristics of only the LED unit 110. FIG. 5 is a light distribution curve diagram showing the light distribution characteristics of the LED unit 110 to which the diffusing globe 11 is attached. FIG. 6 is a light distribution curve diagram showing the light distribution characteristics of the LED module 10 including the LED unit 110 and the light direction conversion element 100. FIG. 7 is a light distribution curve diagram showing the light distribution characteristics of the LED module 10 to which the globe 11 is attached.

  Here, in the light distribution curve diagrams of FIGS. 4 to 7, the circumferential direction indicates an angle with the optical axis (0 ° direction in FIG. 1) of each light source (LED section or LED module), and the radial direction is the maximum. The light intensity is shown relative to a value of 100%.

  As shown in FIG. 5, by attaching the diffusible globe 11 to the LED unit 110, the light emitted from the LED unit 110 is the light emitted backward (180 ° direction) compared to FIG. 4. The proportion is increasing.

  Further, as shown in FIG. 6, the LED module 10 composed of the LED unit 110 and the light direction changing element 100 reduces the light emitted in the 0 ° direction, and the 90 ° direction and the direction from 90 ° to 180 °. Increasing the light emitted to.

  Moreover, it turns out that the LED module 10 which attached the glove | globe 11 has reduced the nonuniformity of luminous intensity, as FIG. 7 shows by the gentle change of light distribution intensity | strength.

  Thus, the light direction conversion element 100 of the LED module 10 according to the present invention has the inclined surface 105 of the light direction conversion element 100 as a whole so that the diameter of the light direction conversion element 100 decreases as the distance from the LED unit 110 increases. As it is inclined inward.

  Such a light direction conversion element 100 reflects a part of the light incident on the light direction conversion element 100 on the inner surface of the inclined surface 105 and advances it in a direction perpendicular to the front of the emission or obliquely rearward. Alternatively, when the light reflected by the inner surface of the inclined surface 105 reaches the inner surface opposite to the inner surface of the inclined surface 105 and exits from the inner side to the outer side of the inclined surface 105, the light path is emitted by refraction. Change diagonally backward with respect to the front. Therefore, the light direction conversion element 100 of the present invention can increase the amount of light emitted in the direction perpendicular to the front of the emission or in the oblique rear.

  Moreover, since such a light direction change element 100 employ | adopts the simple structure which makes the inclined surface 105 incline as a whole, design is easy and implement | achieves the LED module 10 with high light utilization efficiency. be able to.

  Further, the emission surface 104 may have a shape in which the inclination approaches the horizontal as the distance from the center of the LED unit 110 increases in the horizontal direction. Since the light incident on the emission surface 104 is inclined with respect to the optical axis as the distance from the LED unit 110 increases, a total reflection surface can be formed even when the inclination of the emission surface 104 is made closer to the horizontal. Thereby, the light can be reflected more obliquely rearward of the light direction conversion element 100.

[Embodiment 2]
Another embodiment (second embodiment) of the present invention will be described with reference to FIGS.

  In the present embodiment, an LED including the light direction changing element 200 in which a light diffusion surface is formed by performing a light diffusion process on part or all of the surface of the light direction changing element 100 described in the first embodiment. The module 20 will be described. In addition, in this embodiment, about the member which has the same function as FIG. 1 demonstrated in the said Embodiment 1, the same code | symbol is attached and the description is abbreviate | omitted.

  FIG. 8 is a diagram showing the configuration of the LED module 20, and is a cross-sectional view taken along line AA in FIG. As shown in FIG. 8, the LED module 20 includes a light direction conversion element 200 and an LED unit 110. The light direction changing element 200 includes a light direction changing element main body 101 and a base part 102a.

  Further, the light redirecting element main body 101 has a convex incident surface (incident surface) 103a, an outgoing surface (reflective surface) 104a, and an inclined surface (outer peripheral wall) 105a. It corresponds to the surface 103, the exit surface 104, and the inclined surface 105. The base portion 102a has a concave incident surface (incident surface) 106a, which corresponds to the concave incident surface 106 in FIG.

  The base part 102a, the convex incident surface 103a, the exit surface 104a, the inclined surface 105a, and the concave incident surface 106a are formed on a part or all of the surface by blasting, pasting a light diffusion sheet, a light diffusing material A light diffusing process such as coating is performed to form a light diffusing surface 202, a light diffusing surface 203, a light diffusing surface 204, a light diffusing surface 205, and a light diffusing surface 206, respectively.

(Example of light emitted from LED module 20)
Next, an example of light emitted from the LED module 20 is shown in FIG. FIG. 9 is a diagram illustrating an example of light passing through the LED module 20. As shown in FIG. 9, the light emitted from the LED unit 110 is emitted to the outside of the light direction changing element 200 through the light direction changing element 200. In FIG. 9, attention is particularly paid to the light emitted in the right direction of FIG.

  As shown in FIG. 9, the light emitted from the LED unit 110 is incident and scattered on the light diffusion surface 203 provided on the convex incident surface 103a and the light diffusion surface 206 provided on the concave incident surface 106a. Thereafter, the light is scattered and spread every time the light reaches the light diffusion surface 204 provided on the emission surface 104a and the light diffusion surface 205 provided on the inclined surface 105a.

  At this time, if the light incident treatment 103a and the light exit surface 104a are not subjected to light diffusion processing, the ratio of the light reflected by the light exit surface 104a increases, so that the light emitted to the front surface decreases and is reflected by the light exit surface 104a. The concentrated light is concentrated on the inclined surface 105a. Since the light concentrated on the inclined surface 105a is scattered by the light diffusion surface 205, the light distribution spreads.

  Further, by providing the light diffusion surface 204 and the light diffusion surface 205, the light emitted to the outside is diffused with a wider surface area. Therefore, the unevenness in luminous intensity is further alleviated. However, since the light reflected by the light diffusing surface 204 to the inclined surface 105a is scattered, the proportion of light traveling toward the inclined surface 105a decreases and the proportion of light traveling forward increases.

  As described above, there is a trade-off relationship in the present embodiment to alleviate unevenness in luminous intensity and widen the light distribution range, but the degree of unevenness in luminous intensity and the light distribution range can be selected by selecting the surface to be subjected to the light diffusion process. Can be controlled. In addition, unevenness in light intensity and light distribution range can be controlled by changing the degree of diffusion on each light diffusion surface.

(Comparison of light distribution range)
FIG. 10 is a light distribution curve diagram showing the light distribution characteristics of the LED module 20 in which only the surface of the inclined surface 105a of the light direction changing element 200 is subjected to the light diffusion process in the LED module 20 of FIG. FIG. 11 is a light distribution curve diagram showing the light distribution characteristics of the LED module 20 in which the entire surface of the light redirecting element 200 of the LED module 20 of FIG.

  As shown in FIG. 10, it can be seen that, compared with the light distribution curve diagram shown in FIG.

  In addition, by performing light diffusion treatment on the entire surface of the light redirecting element 200, as shown in FIG. 11, a more gradual change in light intensity is shown, and it can be seen that the unevenness in luminous intensity is further alleviated. . Further, it can be seen that the light distribution curve diagram shown in FIG. 11 approximates the light distribution curve diagram shown in FIG. Thus, even if light is not diffused by the globe 11, if light diffusion is performed on the surface of the light redirecting element 200, it is possible to approximate the light distribution characteristics as shown in FIG. 7. Therefore, the LED module 20 can obtain uniform output light with high illuminance without separately providing a material with high light diffusibility.

  Further, when such an LED module 20 is applied to the bulb-type lighting device 1, it is not necessary to consider the material of the globe, the optical characteristics, and the like. That is, since it is not necessary to use the light diffusing globe 11, the transparent globe 11 or the like can be used, so that an inexpensive lighting device can be realized.

(Examples of shapes of the light direction changing element 100 and the light direction changing element 200)
In the first embodiment and the second embodiment, the light direction conversion element 100 and the light direction conversion element 200 have been described by taking the shape of the truncated cone as an example. However, the light direction conversion element 100 and the light direction conversion element 200 are described. The shape is not limited to this.

  FIG. 12 shows examples of the shapes of the light redirecting element 100 and the light redirecting element 200. As shown in FIG. 12, the shape of the light redirecting element 100 and the light redirecting element 200 may be a truncated cone as shown in (a), or shown in (b), (d) and (e). As described above, the bus is not limited to a straight line, and may be a part of an arbitrary curve such as a curve expressed by a higher-order function of quadratic or higher, a hyperbola, or a curve expressed by an exponential function. As shown in (c) and (f). The outer peripheral wall may not be a flat surface, such as a wave shape. Thereby, the LED module 10 and the LED module 20 have a wide light distribution range, and can irradiate light over a wider range.

  In addition, the light direction conversion element 100 and the light direction conversion element 200 in the present invention are (a), (b), (d), (e) and (e) with respect to the emission front of the emitted light emitted from the LED unit 110. As shown in f), it may be formed so as to have a circular cross section, or may be formed in a wave shape as shown in (c). With such a configuration, the LED module 10 and the LED module 20 can uniformly distribute and emit light in each direction.

  In addition, it is preferable that the cross section of the light direction change element 100 and the light direction change element 200 and the light emission part 111 are installed in parallel.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for an illumination device that irradiates light over a wide range, particularly a light bulb-type illumination device.

1 Light Bulb Lighting Device 10 LED Module (Light Source Module)
DESCRIPTION OF SYMBOLS 100 Light direction change element 101 Light direction change element main-body part 102 Base part 103 Convex incident surface (incident surface)
104 Output surface (reflection surface)
105 Inclined surface (outer wall)
106 Concave incident surface (incident surface)
DESCRIPTION OF SYMBOLS 107 Fixing hole 110 LED part 111 Light emission part 112 Substrate 113 Electrode 11 Globe 12 Case 13 Base 14 Reflector 141 Substrate holder 142 Opening part 143 Wire concealment 15 Screw 20 LED module 200 Light direction conversion element 102a Base part 103a Convex incident surface ( Incident surface)
104a Emission surface (reflection surface)
105a Inclined surface (outer wall)
106a Concave incident surface (incident surface)
202 Light diffusing surface 203 Light diffusing surface 204 Light diffusing surface 205 Light diffusing surface 206 Light diffusing surface 22 Transmitted light 23 Reflected light 24 Transmitted light 25 Reflected light

Claims (14)

Light source module comprising: a light emitting unit that emits light; and a light direction changing element that emits at least a part of the emitted light emitted from the light emitting unit in a direction perpendicular to or obliquely rearward of the emission front of the emitted light In
The light direction changing element is characterized in that the outer peripheral wall of the light direction changing element as a whole is inclined inward so that the diameter of the light direction changing element becomes smaller as the distance from the light emitting portion increases. module.   The light direction changing element is a reflecting surface that transmits at least a part of the emitted light emitted from the light emitting unit, and is a reflection for reflecting at least a part of the emitted light toward the inner surface of the outer peripheral wall. The light source module according to claim 1, further comprising a surface. The light direction changing element further includes an incident surface on which the emitted light emitted from the light emitting unit is incident between the light emitting unit and the reflecting surface,
The shape of the reflecting surface is a concave shape,
The light source module according to claim 2, wherein a shape of the incident surface is a convex shape. The incident surface further includes a concave portion for covering the light emitting portion,
The light source module according to claim 3, wherein the concave portion of the incident surface is provided so as to surround the convex portion of the incident surface.   The said light direction change element reflects the light which reaches | attains the said outer peripheral wall in the direction which goes to the center of this light direction change element by the inner surface of the said outer peripheral wall, without passing through the said reflective surface. Item 5. The light source module according to any one of Items 2 to 4.   The light direction changing element guides the light reflected in the direction toward the center of the light direction changing element to the inner surface of the outer peripheral wall located diagonally to the portion of the outer peripheral wall where the light is reflected, and is positioned at the diagonal position. The light source module according to claim 5, wherein the light source module emits obliquely rearward from the outer peripheral wall.   The light source module according to any one of claims 2 to 6, wherein the reflection surface has a shape in which the inclination becomes horizontal as the distance from the center of the light emitting unit increases in the horizontal direction.   The said light direction change element is formed so that it may become circular cross section with respect to the emission front of the emitted light radiate | emitted from the said light emission part, The any one of Claim 1 to 7 characterized by the above-mentioned. The light source module according to 1.   The light source module according to any one of claims 1 to 8, wherein the light direction changing element further includes a bowl-shaped base portion.   The light source module according to claim 9, wherein the base portion has a mechanism for fixing the light direction conversion element.   The light source module according to claim 1, wherein the light direction changing element is made of a transparent material.   The light source module according to any one of claims 1 to 11, wherein the light redirecting element is subjected to a light diffusion process on a part or all of a surface thereof.   The light source module according to claim 1, wherein the light emitting unit is an LED. An illuminating device comprising the light source module according to claim 1.

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