JP2012028619A - Led light distribution lens, led illumination module provided with the led light distribution lens, and lighting equipment provided with the led illumination module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED light distribution lens capable of reducing light non-uniformity, an LED illumination module provided with the LED light distribution lens, and a lighting equipment provided with the LED illumination module.SOLUTION: An LED light distribution lens 1 comprises: an LED recess 2 to emit light forward by disposing an LED3 at a bottom 1a; and a light emission surface 7 to emit the LED light. A hole 8 formed toward the bottom side is provided at roughly the center of the light emission surface. The inner peripheral surface of the hole is a diffusing surface X.

Description

  The present invention relates to an LED light distribution lens, an LED illumination module including the LED light distribution lens, and a lighting fixture including the LED illumination module.

In recent years, lighting fixtures using LEDs as a light source with low power consumption and a long lifetime have been widely used. The LED light distribution lens used in such a luminaire is devised in various ways in order to efficiently emit the LED light forward.
Fig.12 (a) has shown an example of the LED light distribution lens used for the lighting fixture which used LED as the light source.
An LED recess 300 in which the LED 200 is disposed is formed at the bottom 101 of the LED light distribution lens 100 shown here. Light emitted from the LED 200 is incident from the convex incident surface 400 and forward from the light emitting surface 700. Emitted. In addition, the light incident from the side incident surface 500 serving as the side surface of the LED recess 300 is designed to be reflected by the critical reflecting surface 600 and emitted forward from the light emitting surface 700 therefrom.
A solid line arrow shown in FIG. 12A indicates an ideal optical path according to the design intention, and here, the light emission angle is 0 °.

Examples of the LED illumination device include those described in Patent Document 1 below.
The LED illuminating device described here includes a light incident surface in which a light diffusion process is performed on a concave portion facing the LED, and a reflective surface on a lens side surface where a part of light incident from the light incident surface is totally reflected. And a planar light emitting surface on the lens end face that does not face the LED from which the light reflected by the reflecting surface is emitted, and a convex light emitting that emits light that is not reflected by the reflecting surface out of light incident from the light incident surface And has a surface.

JP 2010-129202 A

However, the conventional LED light distribution lens 100 as shown in FIG. 12A has the following problems.
The LED light distribution lens 100 is designed for an ideal irradiation state in which all light emitted from the LED 200 is emitted forward from the light emission surface 700 as indicated by the solid line in FIG. The

  However, a part of the light incident on the side incident surface 500 is reflected by the side incident surface 500 and then passes through the LED light distribution lens 100 from the convex incident surface 400, and is shown by a dotted line in FIG. Some of them follow the optical path as shown by the arrows. In this way, the ratio of the amount of unintentional light that does not conform to the design intention having the property of reflecting on the side incident surface 500 is uniform due to the influence of the material, surface treatment, light incident angle, etc. of the LED light distribution lens 100. Not a small amount, if any. However, the emission angle of the light that follows the light path from the light emission surface 700 is different from the emission angle of the light that follows the ideal light path indicated by a solid line, which affects the illumination effect. In other words, light that follows an optical path that does not conform to the design intention irradiates the irradiated surface at an emission angle different from that of light that follows the design intention, and therefore follows the design intention and the light that follows the optical path of the design intention. The light that follows the light path is projected separately. Then, a portion that strongly illuminates the irradiated surface and a portion that does not illuminate are generated, the uniformity of the light amount is impaired, and light unevenness occurs on the irradiated surface.

In particular, when the LED light distribution lens 100 is used in a lighting fixture (not shown) installed in the vicinity of the wall surface 800 as an irradiation surface as shown in FIG. Since the intended optical path is projected as strong light at an angle substantially perpendicular to the wall surface 800, the above-described light unevenness appears.
In addition, although the light which does not permeate | transmit the convex part incident surface 400 generate | occur | produces a trace amount here, in this case, since it is reflected by the convex part incident surface 400 and is not radiate | emitted from the light-projection surface 700, it has an influence on light nonuniformity. Is not a problem (see the two-dot chain line in FIG. 12B).

In the device described in Patent Document 1, light diffusion processing is performed on the entire surface of the light incident surface, and light is diffused by the light incident surface, so that the light incident surface becomes a pseudo light source and the difference in light distribution characteristics is small. In other words, color unevenness is reduced.
Therefore, even if the light incident surface is configured to be a pseudo light source in this way, the light following the unintentional optical path as described above is inevitably generated, and this is expected to cause light unevenness. .

  The present invention has been made in view of the above circumstances, and an LED light distribution lens capable of reducing light unevenness, an LED illumination module including the LED light distribution lens, and a lighting fixture including the LED illumination module The purpose is to provide.

An LED light distribution lens according to the present invention is an LED light distribution lens provided with an LED recess in which an LED is arranged at the bottom and emits light forward, and a light emission surface from which the light of the LED is emitted. A hole formed toward the bottom side is provided in the approximate center of the light emitting surface, and an inner peripheral surface of the hole is a diffusion surface.
According to this case, the light that follows the unintentional optical path that does not conform to the design intention incident on the hole is diffused on the diffusion surface of the inner peripheral surface of the hole, so that further transmission is suppressed, Even when transmitting, it can be transmitted in a diffused state.
Therefore, the light intensity is relaxed, light distribution according to the design intention can be realized, and light unevenness can be reduced.

An LED light distribution lens according to the present invention is an LED light distribution lens provided with an LED recess in which an LED is arranged at the bottom and emits light forward, and a light emission surface from which the light of the LED is emitted. The light exit surface side corner of the LED recess is provided with an engraved portion formed toward the light exit surface direction, and the inner peripheral surface of the engraved portion is a diffusion surface. It is characterized by.
According to this case, the light following the unintentional optical path that does not conform to the design intention incident on the engraving portion is diffused on the diffusion surface of the inner peripheral surface of the engraving portion, so that further transmission is suppressed. At the same time, even when it is transmitted, it can be transmitted in a diffused state.
Therefore, the light intensity is relaxed, light distribution according to the design intention can be realized, and light unevenness can be reduced.

In the present invention, a hole portion formed toward the bottom side and having an inner peripheral surface serving as a diffusion surface may be provided at substantially the center of the light emitting surface.
According to this case, the presence of the engraved part and the hole makes it possible for light that follows an unintended optical path that does not conform to the design intention to be more reliably diffused on the inner peripheral surface of the engraved part or the hole. The above transmission is suppressed, and even when it is transmitted, it can be transmitted in a diffused state.
Therefore, the intensity of light is relaxed, light distribution according to the design intention can be realized, and light unevenness can be further reduced.

Furthermore, in the present invention, the surface of the light emitting surface is formed in a substantially wave shape in cross section, the hole is formed in a substantially rectangular shape in plan view, and the long side of the opening of the hole is It is good also as what is provided so that it may become substantially parallel with respect to the irradiation surface irradiated with the said LED.
In this case, since the surface of the light emitting surface is formed in a substantially wave shape in cross section, the light emitted from the inclined portion of the wave shape is emitted in an oblique direction, and control is performed to widen the light irradiation direction. be able to. Further, if the hole is formed in a substantially rectangular shape in plan view, and the long side of the opening of the hole is provided so as to be substantially parallel to the irradiation surface irradiated by the LED, Light that spreads in the horizontal direction can be realized.

  An LED illumination module according to the present invention includes a plurality of LEDs, a substrate on which the LEDs are mounted, and a module main body in which any of the above-described LED light distribution lenses corresponds to each of the LEDs. It can be. Moreover, the lighting fixture of this invention shall be equipped with the above-mentioned LED lighting module.

  According to the present invention, it is possible to reduce light unevenness.

(A) is typical sectional drawing for demonstrating the LED light distribution lens which concerns on 1st Embodiment of this invention, (b) is a typical partial fracture | rupture perspective view of the LED light distribution lens. It is typical sectional drawing for demonstrating the light distribution state at the time of installing LED in the bottom part of the LED light distribution lens which concerns on 1st Embodiment. (A) is a typical sectional view for explaining an LED light distribution lens concerning a 2nd embodiment of the present invention, and (b) is a typical fragmentary perspective view of the LED light distribution lens. It is typical sectional drawing for demonstrating the light distribution state at the time of installing LED in the bottom part of the LED light distribution lens which concerns on 2nd Embodiment. (A) is a typical sectional view for explaining an LED light distribution lens concerning a 3rd embodiment of the present invention, and (b) is a typical partial fracture perspective view of the LED light distribution lens. It is typical sectional drawing for demonstrating the light distribution state at the time of installing LED in the bottom part of the LED light distribution lens which concerns on 3rd Embodiment. (A) is typical sectional drawing for demonstrating the LED light distribution lens which concerns on 4th Embodiment of this invention, (b) is a typical partial fracture | rupture perspective view of the LED light distribution lens. It is a top view for demonstrating the LED light distribution lens which concerns on 4th Embodiment. (A) And (b) is typical sectional drawing for demonstrating the light distribution state at the time of installing LED in the bottom part of the LED light distribution lens which concerns on 4th Embodiment, (a) is A- of FIG. A line A sectional view, (b) is the BB sectional drawing of FIG. It is an external appearance perspective view which shows an example of the LED illumination module provided with the LED light distribution lens shown in FIGS. 7-9, (a) is the surface side perspective view of an LED illumination module, (b) is the back surface side of an LED illumination module A perspective view is shown. It is an external appearance perspective view which shows an example of the lighting fixture provided with the LED lighting module shown in FIG. It is a schematic diagram for demonstrating the problem of the conventional LED light distribution lens, (a) is typical sectional drawing which shows the optical path along a design intention, (b) is the schematic which also showed the optical path which does not follow a design intention FIG.

Embodiments of the present invention will be described below with reference to the drawings.
First, an LED light distribution lens 1A according to a first embodiment of the present invention will be described with reference to FIGS. 1 (a), 1 (b), and 2. FIG. In FIG. 2, the diffusion surface (X) where light is diffused is indicated by a bold line for the sake of explanation.
The LED light distribution lens 1A is made of a transparent acrylic resin material or the like, and is formed in a mortar shape having a substantially truncated cone-shaped bottom surface as an upper surface 1b.
An LED recess 2 is formed in the central portion of the bottom 1a of the LED light distribution lens 1A, and an LED 3 (light emitting diode) is disposed so that light is emitted forward (see FIG. 2). ). The LED 3 is mounted on a substrate 3a having a control unit (not shown) for controlling on / off.

The LED recess 2 is processed and formed into a bottomed cylindrical shape, and is formed in a state of being dug in the direction of the light emission surface 7 (upper surface 1b side). The portion directly above the LED 3 (the cylindrical bottomed portion of the LED recess 2) is a convex incident surface 4 that protrudes toward the installation side of the LED 3 and is curved.
The degree of curvature of the convex incident surface 4 is not particularly limited, but is designed to efficiently guide the light emitted from the LED 3 to the light emitting surface 7.
The inner side surface of the cylindrical wall portion of the LED recess 2 is a side incident surface 5.
The mortar-shaped inclined surface is a critical reflecting surface 6 that reflects the light incident from the side incident surface 5 toward the light emitting surface 7, and this inclination angle reflects the light transmitted through the side incident surface 5. It is designed to be guided to the light exit surface 7.

The upper surface 1b of the LED light distribution lens 1A has a substantially circular shape in plan view, and a light emitting surface 7 for emitting the light of the LED 3 forward is formed. A hole 8 formed toward the bottom 1a side is provided in the approximate center of the light emitting surface 7.
The hole 8 shown here is processed and formed into a bottomed cylindrical shape, the light emitting surface 7 side is an opening 80, and is formed in a substantially square shape in a plan view and a vertically long concave shape toward the bottom 1a side. Has been. The substantially circular hole 8 is formed concentrically with the LED recess 2 in plan view. In the figure, among the inner peripheral surfaces of the hole 8, the side surface is indicated by 8a and the bottom surface is indicated by 8b.

The LED light distribution lens 1A may be formed by a mold, and in this case, in the cavity of the mold forming the convex incident surface 4, the side incident surface 5, the critical reflecting surface 6, and the light emitting surface 7. Is subjected to a polishing treatment. The method for the polishing treatment is not particularly limited, but the polishing is performed with a polishing agent, a polishing apparatus or the like until the mirror surface is obtained.
By molding the LED light distribution lens 1 </ b> A with a polished mold, each of the surfaces 4 to 7 described above can be produced in a mirror state. And the light which LED3 emits can be reflected and permeate | transmitted in a desired state by producing each predetermined surface 4-7 of the LED light distribution lens 1 in a mirror surface state in this way.

On the other hand, the hole 8 is produced by a mold not subjected to polishing treatment. That is, if the cavity portion where the hole 8 is formed is molded without being subjected to polishing treatment, the inner peripheral surface of the hole 8 becomes a rough surface. As a result, the inner peripheral surface of the hole 8 can be the diffusion surface X (see the thick line in FIG. 2).
Of course, the portion where the hole 8 is formed may be actively roughened, and the inner peripheral surface (side surface 8a and bottom surface 8b) of the hole 8 may be roughened (textured).

  By forming the hole 8 in this way, light that follows an unintentional optical path that does not conform to the design intention is diffused on the diffusion surface X of the side surface 8a or the bottom surface 8b that is the inner peripheral surface of the hole 8, and more Transmission is suppressed, and even when it is transmitted, it can be transmitted in a diffused state. That is, the unintended optical path that may adversely affect the irradiation surface is diffused on the diffusion surface X of the hole 8 in the process until it is emitted from the light emission surface 7. A specific optical path will be described in detail later.

Here, the shape of the hole 8 is not limited to the substantially circular shape shown in the plan view, and may be a substantially rectangular shape as shown in FIG. 5B, FIG. 7B, or the like. Further, an oval shape (not shown), an elliptical shape (not shown), or the like may be used.
Further, the surface shape of the light emitting surface 7 is not limited to the flat surface shown in the figure, and may be a surface in which a plurality of honeycomb-shaped cells are formed, or may have a cross-sectional corrugated shape shown in FIG. .
The shape of the hole 8, the surface shape of the light emitting surface 7, and the like are set according to the installation position, the purpose of use, and the like when used in a lighting fixture.

  Further, the side surface 8a and the bottom surface 8b of the hole 8 may be subjected to a coating treatment such as black. In this case, it is possible to block the light impinging on the side surface 8a and the bottom surface 8b of the hole 8 from being transmitted, so that it is possible to eliminate the problem of light unevenness caused by light that follows an optical path that does not conform to the design intention. .

Here, the size of the LED light distribution lens 1A is not particularly limited. For example, when the diameter of the light emitting surface 7 is 16.3 mm to 17.2 mm, the LED light distribution lens 1 can be formed from the upper surface of the substrate 3a. It is desirable that the distance to the upper surface 1b is 10.0 mm to 11.0 mm, and the LED recess 2 is formed to have a diameter of 5.5 mm to 6.5 mm. It is desirable to form the hole 8 so that the diameter is 2.00 mm to 3.00 mm and the depth is 4.00 mm to 5.00 mm.
This is because if the diameter of the hole 8 is larger than 3.00 mm, the area of the light emitting surface 7 is reduced and the amount of light extraction tends to be reduced. On the other hand, if the diameter of the hole 8 is smaller than 2.00 mm, there is a possibility that the light that follows the optical path that does not conform to the design intention cannot be completely blocked by the diffusion surface X.
On the other hand, if the depth of the hole 8 is too deep than 5.00 mm, the convex incident surface 4 becomes thin and the molding tends to be difficult. On the other hand, if the depth of the hole 8 is shallower than 4.00 mm, there is a possibility that light that follows an optical path that does not conform to the design intention cannot be blocked by the diffusion surface X.

Next, the optical path of the light emitted from the LED 3 will be described with reference to FIG.
In FIG. 2, the optical path of light that conforms to the design intention is indicated by a solid line, the optical path of light that does not comply with the design intention is indicated by a dotted line, and the optical path of light reflected by the convex incident surface 4 is indicated by a two-dot chain line.
First, most of the light emitted from the LED 3 passes through the LED light distribution lens 1 </ b> A according to the design intention and is emitted from the light emitting surface 7. Specifically, the light incident from the convex incident surface 4 is refracted slightly when passing through the convex incident surface 4 and then emitted forward from the light emitting surface 7. The light incident from the side incident surface 5 reaches the critical reflecting surface 6 after being slightly refracted when passing through the side incident surface 5. The light that has reached the critical reflecting surface 6 is reflected by the critical reflecting surface 6 and emitted forward from the light emitting surface 7.
The light that travels straight forward from the light emitting surface 7 is emitted in a light distribution according to the design intention (see the solid line arrow in FIG. 2), and illuminates the irradiated surface in a substantially circular shape with a uniform amount of light.

However, although it is a trace amount, there is light that is not incident on the convex incident surface 4 and the side incident surface 5 but is reflected there.
The light reflected by the convex incident surface 4 indicated by the two-dot chain line is reflected to the bottom 1a of the LED light distribution lens 1 and does not reach the light emitting surface 7, which may cause adverse effects such as light unevenness. Absent. On the other hand, there is light that reflects the light incident on the side entrance surface 5 and then draws an optical path that is likely to pass through the convex entrance surface 4 and reach the light exit surface 7. However, since these light strikes the diffusing surface X of the side surface 8a or the bottom surface 8b of the hole 8 and light is further diffused, further transmission of light that strikes the irradiation surface is suppressed (see the dotted line arrow in FIG. 2). Even if the light is transmitted through the LED light distribution lens 1A toward the light emitting surface 7 even on the diffusing surface X, it is diffused on the diffusing surface X, so that it is almost vertical, for example, as in the prior art. The light is not emitted from the light exit surface 7 as strong light projected at an angle.
Therefore, light distribution according to the design intention can be realized, and light unevenness can be reduced.

Subsequently, an LED light distribution lens 1B according to a second embodiment of the present invention will be described with reference to FIGS. 3 (a), 3 (b), and 4. FIG. In FIG. 4, the diffusion surface (Y) formed in the engraving portion 9 where light is diffused is indicated by a bold line for the sake of explanation. Moreover, the same code | symbol is attached | subjected to the part which is common in the above-mentioned embodiment, and common description is abbreviate | omitted.
The LED light distribution lens 1B according to the present embodiment is described above in that the engraving portion 9 formed toward the light exit surface 7 is provided at the corner of the LED recess 2 on the light exit surface 7 side. Different from the embodiment.

  The LED recess 2 is processed and formed in the central portion of the bottom 1a of the LED light distribution lens 1B, and the portion directly above the LED 3 becomes a convex incident surface 4 that protrudes toward the installation side of the LED 3 and is curved. Yes. The inner side surface of the cylindrical wall portion of the LED recess 2 is a side incident surface 5. The engraving portion 9 is formed at the corner of the light exit surface 7 side of the LED recess 2 (the cylindrical bottomed corner portion of the LED recess 2) that becomes the boundary between the convex entrance surface 4 and the side entrance surface 5. It is formed and is dug in the direction of the light exit surface 7 along the outer periphery of the convex incident surface 4.

The depth of the engraving portion 9 is about one third of the height of the LED light distribution lens 1B in the illustrated example, but is not limited to this, and partially penetrates to the light emitting surface 7. It is good also as what was formed.
Further, the vicinity of the boundary between the side incident surface 5 or the convex incident surface 4 and each of the three surfaces Y is designed so as not to be incident on the engraving portion 9 (diffusion surface Y) on the theory of design intention. Thereby, the loss of the light quantity by the engraving part 9 can be suppressed to the minimum.
In the figure, of the inner peripheral surface of the engraved portion 9, the inner side surface continuous with the convex incident surface 4 is indicated by 9a, and the outer side surface continuous with the side incident surface 5 is indicated by 9b.

  The LED light distribution lens 1B may be formed by a mold as in the first embodiment. In this case, the cavity of the mold in which the convex incident surface 4, the side incident surface 5, the critical reflecting surface 6, and the light emitting surface 7 are formed is polished while the engraved portion 9 is polished. It is produced by a mold not subjected to. That is, if the cavity portion where the engraved portion 9 is formed is molded without being subjected to polishing treatment, the inner peripheral surfaces (9a, 9b) of the engraved portion 9 become rough. Thereby, the inner peripheral surface of the engraving part 9 can be made into the diffusion surface Y (refer the thick line of FIG. 4). Of course, the part where the engraved part 9 is actively formed may be roughened, and the inner peripheral surface (9a, 9b) of the engraved part 9 may be roughened (textured).

  By forming the engraving portion 9 in this way, light that follows an unintended optical path that does not conform to the design intention is diffused by the diffusion surface Y of the inner surface 9a and the outer surface 9b, which is the inner peripheral surface, and further transmitted. Is suppressed, and even when it is transmitted, it can be transmitted in a diffused state. The optical path will be described in detail later.

The upper surface 1b of the LED light distribution lens 1 has a substantially circular shape in plan view, and a light emitting surface 7 for emitting the light of the LED 3 forward is formed.
The surface shape of the light emitting surface 7 is not limited to the flat surface in the example of the figure, and may be a surface in which a plurality of honeycomb-shaped cells are formed, or may be a cross-sectional corrugated shape shown in FIG.
The shape of the engraving portion 9 and the surface shape of the light emitting surface 7 are set according to the installation position, the purpose of use, and the like when used in a lighting fixture.

The entire inner peripheral surface (9a, 9b) of the engraved portion 9 may be subjected to a coating process such as black. According to this, since the light hitting the inner peripheral surface (9a, 9b) of the engraving portion 9 can be blocked so as not to pass through, the problem of light unevenness caused by the light that follows the optical path not conforming to the design intention is solved. can do.
In addition, when performing a roughening process or a coating process to the internal peripheral surface (9a, 9b) of the engraving part 9, it is necessary to pay attention not to process to the side entrance surface 5. This is because the light that should reach the light exit surface 7 is diffused or blocked according to the design intention.
Here, the size of the LED light distribution lens 1B is not particularly limited as in the first embodiment. For example, the depth of the engraved portion 9 is formed to be 4.00 mm to 5.00 mm. Is desirable. This is because if the depth of the engraving portion 9 is too shallow than 4.00 mm, the light that follows the optical path that does not conform to the design intention may not be blocked by the diffusing surface Y.

Next, the optical path of the light emitted from the LED 3 will be described with reference to FIG.
In FIG. 4, the optical path of light that conforms to the design intention is indicated by a solid line, the optical path of light that does not comply with the design intention is indicated by a dotted line, and the optical path of light reflected by the convex incident surface 4 is indicated by a two-dot chain line.
First, most of the light emitted from the LED 3 passes through the LED light distribution lens 1 </ b> B according to the design intention and is emitted from the light emitting surface 7. Specifically, the light incident from the convex incident surface 4 is refracted slightly when passing through the convex incident surface 4 and then emitted forward toward the light emitting surface 7. The light incident from the side incident surface 5 reaches the critical reflecting surface 6 after being slightly refracted when passing through the side incident surface 5. The light that has reached the critical reflecting surface 6 is reflected by the critical reflecting surface 6 and is emitted forward toward the light emitting surface 7.
The light traveling straight forward from the light emitting surface 7 is emitted with a light distribution according to the design intention without light unevenness (see the solid line arrow in FIG. 4), and the irradiated surface is substantially circular with a uniform light amount. Illuminate.

However, as described above, although there is a trace amount, there is light that is not incident on the convex incident surface 4 and the side incident surface 5 but is reflected there. This light is a light that hits and reflects the side incident surface 5 and then passes through the convex incident surface 4 and draws an optical path that is likely to reach the light exit surface 7. However, depending on the presence of the engraved portion 9, the inner surface 9 a or Diffusion hits the diffusion surface Y of the outer side surface 9b, and further transmission is suppressed (see the dotted arrow in FIG. 4), and even when it is transmitted, it can be transmitted in a diffused state.
Therefore, light distribution according to the design intention can be realized, and light unevenness can be reduced.

Subsequently, an LED light distribution lens 1 </ b> C according to a third embodiment of the present invention will be described with reference to FIGS. 5A, 5 </ b> B, and 6. In FIG. 6, for the sake of explanation, the diffusion surface (X) formed in the hole 8 where light is diffused and the diffusion surface (Y) formed in the engraving portion 9 are indicated by bold lines. Moreover, the same code | symbol is attached | subjected to the part which is common in the above-mentioned embodiment, and common description is abbreviate | omitted.
A hole 8 formed toward the bottom 1a side is provided in the approximate center of the light emitting surface 7 of the upper surface 1b of the LED light distribution lens 1C according to the present embodiment. Moreover, the engraving part 9 formed in the state dug toward the light emission surface 7 direction at the light emission surface 7 side corner of the LED recess 2 (the cylindrical bottomed corner of the LED recess 2). Is different from the above-described embodiment in that is provided.

The hole 8 has an opening 80 on the light emitting surface 7 side, and is formed in a substantially square shape in a plan view and a vertically long concave shape toward the bottom 1a side. Accordingly, four vertically long rectangular side surfaces 8a are formed in a side view, and bottom surfaces 8b are formed in a substantially square shape in a plan view. Other than that, it is the same as that of the first embodiment, and the shape of the hole 8 is not limited to a substantially square shape in a plan view of the example of the figure. In addition to the substantially square shape as shown, an oval shape (not shown), an elliptical shape (not shown), or the like may be used.
Further, the surface shape of the light emitting surface 7 is not limited to the flat surface shown in the figure, and may be a surface in which a plurality of honeycomb-shaped cells are formed, or may have a cross-sectional corrugated shape shown in FIG. .
Further, the shape of the engraved portion 9, the digging depth, the surface shape of the light emitting surface 7, and the like are set according to the installation position, the purpose of use, etc. when used in a lighting fixture.
And the point which may perform a roughening process (texture process) to the hole part 8 and the engraving part 9, and the point which may perform the coating process of black etc. are the same as that of the above-mentioned embodiment.

Next, the optical path of the light emitted from the LED 3 will be described with reference to FIG.
In FIG. 6 as well, the optical path of light that conforms to the design intention is indicated by a solid line, the optical path of light that does not comply with the design intention is indicated by a dotted line, and the optical path of light reflected by the convex incident surface 4 is indicated by a two-dot chain line.
First, most of the light emitted from the LED 3 passes through the LED light distribution lens 1 </ b> C according to the design intention and is emitted from the light emitting surface 7. Specifically, the light incident from the convex incident surface 4 is refracted slightly when passing through the convex incident surface 4 and then emitted forward toward the light emitting surface 7. The light incident from the side incident surface 5 reaches the critical reflecting surface 6 after being slightly refracted when passing through the side incident surface 5. The light that has reached the critical reflecting surface 6 is reflected by the critical reflecting surface 6 and is emitted forward toward the light emitting surface 7.
The light traveling straight forward from the light emitting surface 7 is emitted with a light distribution according to the design intention without light unevenness (see the solid line arrow in FIG. 6), and the irradiated surface is substantially circular with a uniform light quantity. Illuminate.

However, there is a light that is reflected on the convex incident surface 4 and the side incident surface 5 although it is a small amount as described above. Among them, there is a light that reflects on the side incident surface 5 and reflects, and then draws an optical path that is likely to pass through the convex incident surface 4 and reach the light emitting surface 7. The bottom surface 8b, the inner surface 9a of the engraving portion 9 and the diffusion surface X, Y of the outer surface 9b are diffused and further transmitted are greatly suppressed (see the dotted arrows in FIG. 6), and even when transmitted It can be transmitted in a state.
Therefore, light distribution according to the design intention can be realized, and light unevenness can be reduced.

  Subsequently, an LED light distribution lens 1D according to a fourth embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b), for the sake of explanation, the diffusion surface (X) formed in the hole 8 where light is diffused and the diffusion surface (Y) formed in the engraving portion 9 are indicated by bold lines. Show. Moreover, the same code | symbol is attached | subjected to the part which is common in the above-mentioned embodiment, and common description is abbreviate | omitted. Further, in FIG. 8, only the relationship between the LED light distribution lens 1D and the irradiation surface 20 is shown.

In the LED light distribution lens 1D according to the present embodiment, the surface of the light emitting surface 7 is formed in a cross-sectional corrugated shape, and the hole 8 is formed in a substantially rectangular shape in plan view. The long side 8c of the opening 80 is different from the above-described embodiment in that the long side 8c is provided so as to be substantially parallel to the irradiation surface 20 irradiated with the LED 3.
A hole 8 formed toward the bottom 1a side is provided at the approximate center of the light emitting surface 7 of the upper surface 1b of the LED light distribution lens 1D, and the light emitting surface 7 side corner of the LED recess 2 is provided. Is the same as the third embodiment in that the engraving portion 9 formed toward the light emitting surface 7 is provided.

The hole 8 has an opening 80 on the light emitting surface 7 side, and is formed in an elongated, substantially rectangular shape in a plan view and concave toward the bottom 1a side. Thus, by making the hole 8 into a long and substantially rectangular shape in plan view, the area of the recessed portion can be reduced, so that the overall light loss can be reduced. However, as shown in FIG. 9A, light that does not conform to the design intention can be diffused by the diffusion surfaces X and Y of the hole 8 and the engraving portion 9. In the figure, 8a is a side surface of the hole portion 8, 8b is a bottom surface of the hole portion 8, 8c is a long side of the opening portion 80 of the hole portion 8, and 8d is a short side of the opening portion 80 of the hole portion 8.
FIG. 8 is a plan view of the light emitting surface 7 and shows the irradiation surface 20 with a two-dot chain line.

The surface shape of the light emitting surface 7 is formed in a corrugated cross-sectional shape. In the figure, 7a indicates a corrugated peak portion, 7b indicates a valley portion, and 7c indicates an inclined portion. The crest portion 7a and the trough portion 7b are formed to undulate substantially in parallel with the short side 8d of the hole portion 8. When the LED light distribution lens 1D is installed as a lighting fixture, On the other hand, for example, it is desirable that the peak portions 7a are arranged in a direction orthogonal to each other. Details will be described later with reference to FIGS. 9A and 9B.
In addition, the space | interval of the adjacent peak part 7a and the peak part 7a formed in the light-projection surface 7 of LED light distribution lens 1D here is not specifically limited, When it wants to spread light, a space | interval should be narrowed. What is necessary is just to make a space | interval wide when it wants to make light go straight. For example, it is good also as what forms so that the space | interval of the peak part 7a and the peak part 7a may be 0.5 mm-1.5 mm.
As described above, the inner surface (8a, 8b, 9a, 9b) of the hole 8 and the engraved portion 9 may be subjected to a roughening treatment (texture processing), or may be subjected to a coating treatment such as black. This is the same as the embodiment.

Next, the optical path of the light emitted by the LED 3 will be described with reference to FIGS. 9 (a) and 9 (b).
9 (a) and 9 (b), the optical path of light that conforms to the design intention is indicated by a solid line, the optical path of light that does not comply with the design intention is indicated by a dotted line, and the optical path of light reflected by the convex incident surface 4 is 2 It is indicated by a dotted line.
First, most of the light emitted from the LED 3 passes through the LED light distribution lens 1D according to the design intention and is emitted from the light emitting surface 7. Specifically, the light incident from the convex incident surface 4 is refracted slightly when passing through the convex incident surface 4 and then emitted forward toward the light emitting surface 7. The light incident from the side incident surface 5 reaches the critical reflecting surface 6 after being slightly refracted when passing through the side incident surface 5. The light that has reached the critical reflecting surface 6 is reflected by the critical reflecting surface 6 and is emitted forward toward the light emitting surface 7. At this time, as shown in FIG. 9B, the light emitted from the peak portion 7a (same for the valley portion 7b) is emitted in a state of going straight forward.
Further, as shown in FIG. 9A, the light emitted from the inclined portion 7c is refracted and emitted obliquely in the lateral direction. That is, since the crest portion 7a is arranged in a direction orthogonal to the irradiation surface 20, the light emitted from the inclined portion 7c is substantially parallel to the irradiation surface 20, that is, light that spreads in the lateral direction. (See the solid line arrow in FIG. 9A).
The light emitted from these light emission surfaces 7 is emitted with light distribution according to the design intention without light unevenness (see solid arrows in FIGS. 9A and 9B), and the irradiation surface 20 is uniform. Illuminated in a substantially elliptical shape spreading in the horizontal direction (long side 8c direction) with the amount of light.

However, as described above, although there is a trace amount, there is light that is not incident on the convex incident surface 4 and the side incident surface 5 but is reflected there. Among them, there is a light that reflects on the side incident surface 5 and reflects, and then draws an optical path that is likely to pass through the convex incident surface 4 and reach the light emitting surface 7. The bottom surface 8b, the inner surface 9a of the engraving portion 9 and the diffusion surfaces X and Y of the outer surface 9b diffuse and diffuse, and further transmission is greatly suppressed (see the dotted arrows in FIGS. 9A and 9B), Even when transmitting, it can be transmitted in a diffused state.
Therefore, the presence of the hole portion 8 and the engraved portion 9 further reduces the emission of strong light that does not conform to the design intention from the light exit surface 7, and can realize light distribution according to the design intention. Reduction can be achieved.

According to the above configuration, since the surface of the light emitting surface 7 is formed in a substantially corrugated shape, the light emitted from the light emitting surface 7 is directed to a specific direction (in the above example, with respect to the irradiation surface 20). It is possible to perform control that expands in the horizontal direction. At this time, the light that follows the unintentional optical path that does not conform to the design intention is diffused by the inner peripheral surface (8a, 8b, 9a, 9b) of the hole 8 and the engraved portion 9, and thus further transmission is suppressed. In addition, even when it is transmitted, it can be transmitted in a diffused state.
Therefore, it is particularly suitable for the LED light distribution lens 1D used in a lighting fixture that is disposed in the vicinity of the irradiation surface and is installed as an indirect illumination that is required to illuminate the irradiation surface beautifully.

FIGS. 10A and 10B show an example of the LED illumination module 10 including the LED light distribution lens 1D according to the fourth embodiment. 10 (a) and 10 (b), the illustration of the LED 3 and the substrate 3a is omitted for explanation, and the partially enlarged perspective view shown in FIG. 10 (b) is a longitudinal sectional perspective view. In order to facilitate understanding of the structure of the LED light distribution lens 1D, hatching is omitted.
The LED illumination module 10 includes a plurality of LEDs (see FIGS. 8A and 8B), a substrate on which the LEDs are mounted (see FIGS. 8A and 8B), and an LED light distribution lens 1D. The module main body 10a is arranged so as to correspond to each.
The module main body 10a includes a base material 10aa in which mounting holes 10b are provided as appropriate with a predetermined interval, and a cylindrical portion 10ab in which a plurality of LED light distribution lenses 1D are provided.
When used as a lighting fixture, a fixture (not shown) such as a screw is inserted into the mounting hole 10b.
The figure shows an example in which the LED light distribution lenses 1D are arranged in a line in the longitudinal direction, and the cylindrical portion 10ab and the LED light distribution lens 1D are integrally formed.
The module main body 10a and the LED light distribution lens 1D may be formed separately, and the LED light distribution lens 1D may be incorporated later.

As shown in FIG. 10B, when the module main body 10a is viewed from the back side, a plurality of mortar-shaped critical reflecting surfaces 6 and a plurality of LED recesses 2 are visible. Further, as shown in the partial enlarged perspective view of FIG. 10B, the bottomed portion of the LED recess 2 is formed in a state in which the convex incident surface 4 is formed and dug in the direction of the light emitting surface 7. A hole 8 is formed in the approximate center of the engraving portion 9 and the light exit surface 7.
The configuration of the LED illumination module 10 is not limited to a line type as shown in the figure, and the number and arrangement of the LED light distribution lenses 1D are not limited to this. Here, a configuration in which five LED light distribution lenses 1D are arranged in a row is configured as one module. However, for example, a configuration in which three LED light distribution lenses 1D are arranged in a plurality of rows may be a single module. Moreover, although the LED illumination module 10 provided with LED distribution lens 1D demonstrated as 4th Embodiment was demonstrated as an example here, LED distribution lens 1A-1C etc. which were demonstrated in 1st Embodiment-3rd Embodiment etc. It goes without saying that may be used.

FIG. 11 is an example of a lighting fixture 11 including the LED lighting module 10 shown in FIGS. 10 (a) and 10 (b). Thus, if LED distribution lens 1D mentioned above is used as LED lighting module 10 and it is built in lighting fixture 11, it can be used as a lighting fixture.
The figure shows a line-type lighting fixture 11 in which LED light distribution lenses 1D are arranged in a line in the longitudinal direction, and is used as indirect illumination under a shelf, a showcase, a wall surface or the like.
The luminaire 11 includes a main body portion 11a having a substantially rectangular parallelepiped shape with a power supply section for supplying a voltage to the LED, and an LED illumination module 10 attached to the main body portion 11a by a fixing tool 10c such as a screw. I have. A plurality of LED illumination modules 10 are connected in the longitudinal direction by a connector 11b.

According to this, it can be set as the lighting fixture 11 which can implement | achieve the light distribution according to the design intent without a light nonuniformity, and the lighting fixture 11 with little power consumption and long life can be comprised using the characteristic of LED. In particular, the light emitted from the light emitting surface 7 of the LED light distribution lens 1D is emitted with light distribution according to the design intention without light unevenness (see solid line arrows in FIGS. 9A and 9B) and irradiated. It is possible to illuminate the surface with a uniform light quantity and a substantially elliptical shape spreading in the lateral direction.
Therefore, if it is set as the lighting fixture 11 which has arrange | positioned LED light distribution lens 1D in a line in multiple lines like the example of a figure, there is no light nonuniformity and the whole irradiation surface can be illuminated brightly and the effect effect of light can be heightened.
Although not shown here, it may be provided with a mounting bracket that can freely adjust the irradiation angle. Moreover, the structure of the lighting fixture 11 is not limited to the example of a figure.

1A-1D LED light distribution lens 2 LED recess 3 LED
8 hole 9 engraving 10 lighting module 11 lighting fixture X, Y diffusion surface

Claims (6)

An LED light distribution lens comprising an LED recess for disposing an LED at the bottom and emitting light forward, and a light emitting surface from which the LED light is emitted,
The LED light distribution lens, wherein a hole formed toward the bottom side is provided at a substantially center of the light emitting surface, and an inner peripheral surface of the hole is a diffusion surface. An LED light distribution lens comprising an LED recess for disposing an LED at the bottom and emitting light forward, and a light emitting surface from which the LED light is emitted,
The light exit surface side corner of the LED recess is provided with an engraved portion formed toward the light exit surface direction, and the inner peripheral surface of the engraved portion is a diffusion surface. A featured LED light distribution lens. In claim 2,
An LED light distribution lens, characterized in that a hole portion formed toward the bottom side and having an inner peripheral surface as a diffusion surface is provided at substantially the center of the light emitting surface. In any one of Claims 1-3,
The surface of the light emitting surface is formed in a substantially wave shape in cross section, and the hole is formed in a substantially rectangular shape in plan view, and the long side of the opening of the hole is irradiated with the LED. The LED light distribution lens is provided so as to be substantially parallel to the irradiation surface. A plurality of LEDs;
A substrate on which the LED is mounted;
An LED illumination module comprising: a module body in which the plurality of LED light distribution lenses according to any one of claims 1 to 4 are arranged so as to correspond to each of the LEDs.   A lighting fixture comprising the LED lighting module according to claim 5.

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