JP5620285B2 - Luminous flux control member, light emitting device including the luminous flux control member, and illumination device including the luminous device - Google Patents

Description

  The present invention relates to a light flux controlling member, a light emitting device including the light flux controlling member, and an illumination device including the light emitting device, and in particular, controlling light distribution characteristics of light emitted from a light emitting element. The present invention relates to a light beam control member suitable for irradiating an irradiated surface, a light emitting device including the light beam control member, and an illumination device including the light emitting device.

  Conventionally, as an externally or internally illuminated light-emitting device used for showcase illumination or signboard illumination, light emission for spot illumination that illuminates a specific area by irradiating light in a specific direction A device was used.

  In recent years, light emitting diodes (LEDs) have come to be used as light sources of this type of light emitting device from the viewpoints of miniaturization, power consumption reduction, environmental conservation, and the like.

  By the way, an LED emits a light beam with a predetermined divergence angle from its light emitting part. To apply this to a light emitting device for spot illumination, the light emitted from the light emitting part is collected in the direction of the irradiated surface. There was a need for a means of light.

  Therefore, conventionally, as one of this kind of condensing means, a light beam control member 1 for spot illumination (in other words, a spot lens) as shown in FIGS. 32 to 36 has been used. Here, FIG. 32 is a perspective view of the light flux controlling member 1. FIG. 33 is a front view of the light flux controlling member 1. FIG. 34 is a plan view of FIG. FIG. 35 is a bottom view of FIG. Note that the left and right side views of FIG. 33 are the same as FIG. FIG. 36 shows a longitudinal sectional view (longitudinal sectional view including the optical axis OA) of the light flux controlling member 1 together with the light emitting element 2 such as an LED. In other words, FIG. 1 is a configuration diagram of a light emitting device 3 including 1 and a light emitting element 2. FIG. In FIG. 36, the light emitting element 2 has a light flux controlling member in a state in which the center axis (center light) of the light emitted from the light emitting element 2 is aligned with the optical axis OA of the light flux controlling member 1. 1 is disposed to face the other. Although not shown, the light emitting element 2 is mounted on a substrate, and the light flux controlling member 1 is attached on the substrate.

  As shown in FIG. 36, the light flux controlling member 1 is opposite to the light emitting element 2 in the direction of the optical axis OA (FIG. 36) on the light emitting element facing surface portion (lower end portion in FIG. 36) arranged to face the light emitting element 2. The concave portion 5 is formed to be recessed toward the upper side. As shown in FIG. 36, the recess 5 has an isosceles trapezoidal longitudinal section, and the inner surface of the recess 5 is perpendicular to the optical axis OA intersecting the optical axis OA, and the inner surface surrounding the inner bottom surface. And a peripheral surface. As shown in FIG. 35, the inner bottom surface of the recess 5 has a circular shape concentric with the optical axis OA in the bottom view. As shown in FIG. 36, the inner peripheral surface of the recess 5 extends from the outer peripheral end of the inner bottom surface of the recess 5 toward the light emitting element 2 side, and the inner diameter increases toward the light emitting element 2 side. It is formed in the taper surface (inner surface taper) concentric with such optical axis OA.

Such a recess 5 has a function of causing the light emitted from the light emitting element 2 to enter the light flux controlling member 1. That is, the inner bottom surface of the recess 5 is a first incident surface 6, and the angle (with respect to the optical axis OA of the light (light flux) emitted from the light emitting element 2 is formed on the first incident surface 6 ( exit angle) is relatively small center side of the first light (light beam) L ₁ is made incident. However, in the figure, only one light beam of the first light L ₁ is representatively illustrated. Further, the inner peripheral surface of the recess 5 is a second incident surface 7, and the second incident surface 7 has an outer side (periphery) of the first light L ₁ out of the light emitted from the light emitting element 2. second light side) (light flux) L ₂ is made incident. The second light L ₂ has a relatively large angle (exit angle) formed with the optical axis OA as compared with the first light L ₁ . However, in the figure, only two rays of the second light L ₂ are representatively illustrated.

  As shown in FIG. 36, the light flux controlling member 1 has an emission surface 8 formed at an end portion (upper end portion in FIG. 36) opposite to the light emitting element 2 in the optical axis OA direction. As shown in FIGS. 36 and 34, the emission surface 8 has a substantially conical shape in which the optical axis OA is a rotationally symmetric axis and the outer diameter decreases toward the opposite side of the light emitting element 2 in the optical axis OA direction. It is formed in a surface shape. The operation of the emission surface 8 will be described later.

  Furthermore, as shown in FIG. 36, an outer peripheral surface 10 that surrounds the optical axis OA is formed between the recess 5 and the emission surface 8. As shown in FIG. 36, the outer peripheral surface 10 extends from the end of the concave portion 5 on the optical element 2 side toward the emission surface 8 side, and the outer diameter increases toward the emission surface 8 side. It is formed in a tapered surface shape (outer surface tapered shape) concentric with the optical axis OA. More specifically, as shown in FIG. 36, the outer peripheral surface 10 has a longitudinal cross-sectional outer shape (bus line) including the optical axis OA slightly bulging outward in the radial direction with respect to the optical axis OA. It is formed in the curved taper surface which exhibits such a circular arc shape.

Such an outer peripheral surface 10 is a total reflection surface 11 having a function of totally reflecting a part of the light emitted from the light emitting element 2. On the total reflection surface 11, the second light L ₂ incident from the second incident surface 7 travels on the optical path in the light flux controlling member 1 (light flux controlling member main body) and then has an incident angle greater than the critical angle. Internal incidence is made. The total reflection surface 11 totally reflects the internally incident second light L ₂ toward the emission surface 8.

Then, the first light L ₁ incident from the first incident surface 6 travels on the optical path inside the light flux controlling member 1 and reaches directly (internal incident) to the aforementioned exit surface 8. Yes. The direct means that the total reflection on the total reflection surface 11 is not performed. At this time, the second light L ₂ incident from the second incident surface 7 reaches the output surface 8 through total reflection on the total reflection surface 11 (internal incidence). The emission surface 8 is adapted to first light L ₁ and the second light L ₂ that these reach to be emitted toward the illuminated surface.

  As shown in FIGS. 32 to 36, there is a gap between the end of the outer peripheral surface 10 on the exit surface 8 side (upper end in FIG. 36) and the outer end of the output surface 8 (lower end in FIG. 36). In the plan view (FIG. 34), the flange portion 12 having an annular shape concentric with the optical axis OA is formed to extend outward in the radial direction from the outer peripheral surface 10 and the emission surface 8.

  Such a light flux controlling member 1 is made of, for example, a resin material such as PMMA (polymethyl methacrylate), PC (polycarbonate) and EP (epoxy resin), or a translucent material such as glass.

Then, for example, as shown in FIG. 37, such a light flux controlling member 1 has an optical axis OA inclined with respect to the irradiated surface 15a of the irradiated member 15 for external illumination such as an externally illuminated signboard. By being arranged, an external illumination type illumination device is configured. However, the irradiated member 15 and the irradiated surface 15a have a depth (horizontal width) in the direction perpendicular to the paper surface of the figure, and accordingly, in the configuration of the figure, a plurality of light flux controlling members 1 are They are arranged in a line at a predetermined interval in the direction perpendicular to the paper surface. In the figure, for the sake of convenience, only one light flux controlling member 1 on the foremost side is shown. Further, in the configuration shown in the figure, the inclination direction of the optical axis OA of each light flux controlling member 1 is emitted from the light emitting element 2 at a large angle with respect to the optical axis OA and is irradiated on the irradiated surface 15a in the vicinity of the light emitting element 2. The light is inclined such that the incident angle on the irradiated surface 15a is smaller than the light emitted at a smaller angle with respect to the optical axis OA. In such a configuration, the first light L ₁ and the second light L ₂ (see FIG. 36) emitted from the respective emission surfaces 8 of each light flux controlling member 1 are inclined with respect to the irradiated surface 15a. Irradiation is performed from a direction (that is, a direction having an inclination with respect to the surface normal direction of the irradiated surface 15a), and thereby the irradiated surface 15a is illuminated.

FIG. 38 shows the light (that is, the first light L ₁ and the second light L ₂₎ emitted from one light flux controlling member 1 to the irradiated surface 15a in the external illumination type illumination device configured as described above. The illuminance distribution of the mixed light) is schematically shown. This illuminance distribution reflects the light distribution characteristics of the light emitted (controlled) by the light flux controlling member 1. Here, the lower end portion 9a of the rectangular area in the figure shows the end on the light flux controlling member 1 side (the light source vicinity side) in the area to be illuminated on the irradiated surface 15a. On the other hand, the upper end portion 9b of the rectangular region indicates the end portion on the opposite side (light source far side) from the light flux controlling member 1 in the region to be illuminated on the irradiated surface 15a. Note that the area to be illuminated may be the entire irradiated surface 15a. Further, the horizontal direction in the figure corresponds to the alignment direction of the plurality of light flux controlling members 1 (the horizontal width direction of the irradiated member 15). In the same figure, a plurality of elliptical closed curves (an elliptical shape with the longitudinal direction in the figure as a major axis) spreading in a ripple shape from the central side toward the peripheral side are shown. Each closed curve is a contour line connecting points of the same illuminance on the irradiated surface 15a. Among the plurality of contour lines, the most central contour line has the highest corresponding illuminance, and the corresponding illuminance gradually decreases from the most central contour line toward the contour line on the peripheral side. ing. In addition, each contour line in the figure shows representative positions of the same illuminance on the irradiated surface 15a in a discrete manner. Actually, the illuminance decreases almost continuously from the center side toward the peripheral side. So countless contour lines can be drawn. However, the contour line on the most peripheral side in the figure corresponds to the lower limit of illuminance considered to be sufficient illuminance to illuminate the illuminated surface 15a.

In addition to such an external illumination type illumination device, the light flux controlling member 1 may constitute, for example, an internal illumination type illumination device as shown in FIG. As shown in the figure, in a double-sided internal illumination type illumination device, a light flux control member 1 is a pair of irradiated members for internal illumination, such as an internally illuminated signboard, having translucency arranged opposite to each other. 17 and 18. Specifically, as shown in the figure, a bottom plate 20 perpendicular to them is disposed between the lower ends of the irradiated members 17 and 18, and the inside of the bottom plate 20 (upper side in the figure). Is the position where the light flux controlling member 1 is arranged. A substrate on which the light emitting element 2 is mounted is attached to the inner surface of the bottom plate 20. Furthermore, as shown in the figure, a cylindrical holder 21 concentric with the optical axis OA for holding the light flux controlling member 1 surrounds the outer peripheral surface 10 at the flange portion 12 of the light flux controlling member 1. Is formed. Then, the lower end surface of the holder 21 is fixed on the bottom plate 20 (or on the substrate) after aligning the light flux control member 1 and the light emitting element 2, so that the light flux control member 1 is on the bottom plate 20. Is held in. Furthermore, in the figure, the light flux controlling member 1 is arranged so that the optical axis OA is parallel to the irradiated surfaces 17a and 18a of the irradiated members 17 and 18. Further, in the same figure, as in the case of FIG. 37, a plurality of light flux controlling members 1 are aligned and arranged in the direction perpendicular to the paper surface. Although not shown, a top plate facing the bottom plate 20 is disposed between the upper ends of the irradiated members 17 and 18, and the irradiated members 17, 18, the bottom plate 20 and the top plate are the same. A pair of side plates facing each other in parallel is disposed at both ends in the direction perpendicular to the drawing. The irradiated members 17 and 18, the bottom plate 20, the top plate and the side plates constitute a rectangular casing, and the light flux controlling member 1 is housed inside the casing. In such a double-sided interior illumination device, similarly to the external illumination type illumination device, the light-emitting elements 2 emit light at a large angle with respect to the optical axis OA, and the irradiated surfaces 17a and 18a in the vicinity of the light-emitting elements 2 are irradiated. The light emitting element 2 and the light flux controlling member 1 are positioned so that the incident light is smaller in the incident angle to the irradiated surfaces 17a and 18a than the light emitted at a smaller angle with respect to the optical axis OA. Thus, the lights L ₁ and L ₂ emitted from the light flux controlling member 1 are irradiated to the irradiated surfaces 17a and 18a from an oblique direction.

  Furthermore, the light flux controlling member 1 may constitute a single-sided interior illumination device as shown in FIG. The configuration shown in FIG. 1 includes a plate-like reflecting member 24 and a translucent irradiated member 25 such as an internally-illuminated signboard, which are opposed to each other in parallel. As shown in the figure, the light flux controlling member 1 is disposed between the reflecting member 24 and the irradiated member 25 as in the case of double-sided internal illumination. In the configuration of the figure, the light irradiated from the light flux controlling member 1 to the reflecting member 24 side is reflected by the reflecting surface 24a of the reflecting member 24 toward the irradiated member 25 side. Different from the case of the lighting device.

  As a conventional technique related to the light flux controlling member 1 applicable to such internal illumination and external illumination, for example, a technique shown in Patent Document 1 has been proposed.

JP 2007-5218 A

  However, when the conventional light flux controlling member 1 is applied to external illumination as shown in FIG. 38, an area in the vicinity of the light flux controlling member 1 on the irradiated surface 15a (rectangular area in the figure). It can be seen that the vicinity of the lower end 9a in FIG. 4 is outside the contour line on the most peripheral side in FIG. This indicates that the illuminance in the area near the light flux controlling member 1 on the irradiated surface 15a is insufficient.

  Such a phenomenon is expected to become more prominent when applied to internally-illuminated illumination as shown in FIGS. 39 and 40, since the optical axis OA of the light flux controlling member 1 is parallel to the irradiated surfaces 17a, 18a, and 25a, in the case of the external illumination type (configuration of FIG. 37). ), The incident angle of the irradiation light with respect to the irradiated surfaces 17a, 18a, and 25a is increased. In other words, the irradiation light is irradiated to a position farther from the light flux controlling member 1. is there.

  That is, in the conventional light flux controlling member 1, when irradiating light on the surface to be irradiated, there is a problem that the area in the vicinity of the light source on the surface to be irradiated becomes insufficient in light quantity (in other words, a dark part).

  Further, the positional relationship between the light emitting device using the conventional light flux controlling member 1 and the irradiated surface 15a is changed, and the light emitting device is arranged at a position where the light quantity in the region near the light source can be compensated as shown in FIG. Even in this case, as indicated by the closed curve of the broken line in the figure, dark portions are generated on the irradiated surface corresponding to the plurality of light emitting devices. Therefore, in such a case, the contour line on the most peripheral side of the illuminance distribution on the irradiated surface by the light emitted from one light emitting device is orthogonal to the optical axis (projected optical axis) projected on the irradiated surface. It is necessary to spread in the direction.

  Therefore, the present invention has been made in view of such a problem, and a light flux control member that can improve a partial shortage of light amount on an irradiated surface, a light emitting device including the light flux control member, and the light emission. It aims at providing the illuminating device provided with the apparatus.

In order to achieve the above-described object, the light flux controlling member according to claim 1 of the present invention is characterized in that the light emitted from the light emitting element is controlled in an oblique direction with respect to the irradiated surface by controlling the light distribution characteristics thereof. A light flux controlling member for irradiating, wherein the light flux controlling member includes a light emitting element facing surface portion disposed to face the light emitting element, and an emission formed on a side opposite to the light emitting element with respect to the light emitting element facing surface portion. And an outer peripheral surface extending from the outer peripheral end portion of the light emitting element facing surface portion toward the outer peripheral end portion of the emitting surface, and the light emitted from the light emitting element is transmitted to the light emitting element facing surface portion. A recess for entering the light flux controlling member is formed, the recess is formed as a plane orthogonal to the optical axis, and the first light on the center side of the light emitted from the light emitting element is incident. First incident surface and outer peripheral edge of the first incident surface Extending from the light emitting element side toward the light emitting element side, and a second incident surface on which the second light outside the first light of the light emitted from the light emitting element is incident, and the outer peripheral surface The diameter gradually increases from the light emitting element facing surface side toward the light exit surface so that the second light incident on the second light entrance surface is totally reflected toward the light exit surface. And the exit surface is incident from the first incident surface and directly reaches the first light and the second incident surface and reaches the total reflection surface. is the emitted toward the second light to the illuminated surface, on the outer peripheral surface, the exit surface of the third light forming part of the second light, without reaching the exit surface emitting function unit to emit to the outside of the outer peripheral surface at the position of the light emitting element side is formed than the exit Ability section, the third light, the so that is emitted in a large angle direction from the optical axis than the first light and said second light emitted from the exit surface, the said outer circumferential surface A notch portion or an outer peripheral surface roughened portion formed on a part of the outer peripheral surface in the circumferential direction of the wall portion of the light flux controlling member main body sandwiched between the inner peripheral surfaces of the recesses and on the light emitting element facing surface side. And the notch portion is formed on a wall portion of the light flux controlling member main body sandwiched between the outer peripheral surface and the inner peripheral surface of the concave portion on a part of the outer peripheral surface in the circumferential direction and on the light emitting element facing surface side. In a predetermined portion, the flat surface emitting portion that is recessed by being cut down parallel to the optical axis or the curved surface emitting portion that is hollowed out so as to reduce the thickness of the wall portion, the third portion is provided. Is refracted at the planar light emitting portion after being incident on the second incident surface, or The curved surface emitting part is formed so as to be refracted and diverged to be emitted to the outside of the outer peripheral surface, and the outer peripheral surface roughening part is a part of the outer peripheral surface in the circumferential direction and the light emitting element facing surface part side The predetermined portion is roughened, and is formed so that the third light is diffused in the outer peripheral roughened portion after being incident on the second incident surface and is emitted to the outside of the outer peripheral surface. There is in point.

According to the invention of claim 1 of this, the emission function unit, a third light, the position of the light emitting element side of the emission surface, from the first light and the second light emitted from the emission surface Can also be emitted in a large angular direction from the optical axis (in other words, a direction in which the incident angle with respect to the irradiated surface becomes small), so that the third light is irradiated onto a region near the light source on the irradiated surface, Insufficient light quantity in this region can be improved.
In addition, the emission function unit can be realized by a simple configuration including a notch.
The cut-out portion can be realized by a simple configuration including the flat emission portion, and the third light irradiation position on the irradiated surface is preferably utilized by utilizing light refraction by the flat emission portion. It is also possible to make it easier.
In addition, the emission function unit can be realized by a simple configuration including the phase emission unit, and the irradiation region of the third light on the irradiated surface is expanded by using the divergence of light by the curved emission unit. be able to.
In addition, the emission function unit can be realized by a simple configuration including the outer peripheral surface roughening unit, and the light amount of the third light is made uniform by utilizing the diffusion of light by the outer peripheral surface roughening unit. As a result, it is possible to make the illuminance uniform in the area near the light source on the irradiated surface.

Still further, the light flux controlling member according to claim 2 is characterized in that, in claim 1 , the light emitting function part further includes an incident surface obtained by roughening a predetermined portion of the second incident surface on the light emitting element facing surface side. A surface roughening portion is further provided , and the third light is diffused in the incident surface roughening portion to be transmitted to the outside of the outer peripheral surface.

According to the second aspect of the present invention, the emission function unit can be realized by a simple configuration including the incident surface roughening unit, and light diffusion by the incident surface roughening unit is utilized. Thus, the amount of the third light can be made uniform.

The characteristic of the light flux controlling member according to claim 3, Oite to claim 1 or 2, further outwardly of the outer peripheral surface, the holder for holding the light flux control member body disposed, said holder, The light distribution characteristic of the third light is corrected by refracting or diffusing the third light emitted from the emission function unit.

According to the third aspect of the invention, since the light distribution characteristic of the third light emitted from the emission function unit can be corrected by the holder, the irradiation position of the third light on the irradiated surface Or uniformizing the amount of light of the third light (in other words, equalizing the illuminance of the region near the light source on the irradiated surface).

Furthermore, the light-emitting device according to claim 4 includes a light-emitting element that emits light and the light flux controlling member according to any one of claims 1 to 3 , wherein the light-emitting element has a center of the light. It is in the point arrange | positioned in the position which faces the said recessed part of the said light beam control member in the state which matched the axis | shaft with the optical axis of the said light beam control member.

According to the fourth aspect of the present invention, it is possible to realize a light-emitting device that can effectively irradiate light to an area near the light source on the surface to be irradiated and improve the shortage of light in this area.

Furthermore, the illumination device according to claim 5 includes the light-emitting device according to claim 4 and an irradiated surface on which light is emitted by the light-emitting device, and the light flux controlling member of the light-emitting device includes: The light emitting function part is arranged in a state in which the light emitting function part is directed to the irradiated surface side.

According to the invention of claim 5 , it is possible to effectively irradiate the area near the light source on the irradiated surface to improve the shortage of light in this area, thereby improving the illumination quality. An illuminating device that can be realized can be realized.

The illumination device according to claim 6 includes the light-emitting device according to claim 4 and an irradiated surface on which light is emitted by the light-emitting device, and the light flux controlling member of the light-emitting device includes: It exists in the point arrange | positioned in the state which distanced the said output function part from the said to-be-irradiated surface.

According to the sixth aspect of the present invention, the illuminance distribution on the irradiated surface can be improved by expanding the irradiation region on the irradiated surface in the direction orthogonal to the projection optical axis described above. In particular, when arranging a plurality of light emitting devices in alignment, dark portions at positions corresponding to the light emitting devices on the irradiated surface can be effectively reduced.

Further, the illumination device according to claim 7 is characterized in that in claim 5 or 6 , the illumination device is an external illumination type illumination device, and the light flux control member is provided from the light flux control member that irradiates the irradiated surface. Out of the emitted light, the emitted light with a large angle with respect to the optical axis has a smaller incident angle with respect to the irradiated surface than the emitted light with a small angle with respect to the optical axis. It is in the point arranged in a tilted state.

In the invention according to the claim 7, even when applied to lighting SotoTerushiki, it is possible to reliably improve the partial insufficient light on an irradiated surface.

Further, the illumination device according to claim 8 is characterized in that, in claim 5 or 6 , the illumination device is an internally-illuminated illumination device, and the light flux control member is a member of the light flux control member that irradiates the irradiated surface. Among the emitted light, the emitted light having a large angle with respect to the optical axis is arranged in a state where the incident angle to the irradiated surface is smaller than the emitted light having a small angle with respect to the optical axis. In the point.

And according to this invention concerning Claim 8 , even when applying to internal illumination type illumination, the partial light quantity shortage in a to-be-irradiated surface can be improved reliably.

  According to the present invention, it is possible to improve partial light quantity shortage on the irradiated surface.

The perspective view which shows 1st Embodiment of the light beam control member which concerns on this invention. Front view of the light flux controlling member of FIG. Right side view of FIG. Bottom view of FIG. 1 is a schematic configuration diagram showing a first embodiment of a light-emitting device according to the present invention. Schematic configuration diagram showing an external illumination type illumination device as a first embodiment of the illumination device according to the present invention Schematic diagram showing the illuminance distribution on the illuminated surface when the light flux controlling member of the first embodiment is used for illumination of the illuminated surface. Schematic configuration diagram showing a double-sided interior illumination device as a first embodiment of the illumination device according to the present invention Schematic block diagram showing a single-sided interior illumination device as a first embodiment of the illumination device according to the present invention In 1st Embodiment of the light beam control member which concerns on this invention, the longitudinal cross-sectional view which shows a 1st modification The longitudinal cross-sectional view which shows the 2nd modification in 1st Embodiment of the light beam control member which concerns on this invention The perspective view which shows 2nd Embodiment of the light beam control member which concerns on this invention. The front view of the light beam control member of FIG. Right side view of FIG. The bottom view of FIG. Schematic configuration diagram showing a second embodiment of a light emitting device according to the present invention. The perspective view which shows 3rd Embodiment of the light beam control member which concerns on this invention. FIG. 17 is a front view of the light flux controlling member of FIG. Right side view of FIG. 18 is a bottom view of FIG. The schematic block diagram which shows 3rd Embodiment of the light-emitting device based on this invention. The front view which shows 4th Embodiment of the light beam control member which concerns on this invention. Right side view of FIG. The bottom view of FIG. Schematic configuration diagram showing a fourth embodiment of a light emitting device according to the present invention. The bottom view which shows 5th Embodiment of the light beam control member which concerns on this invention. Schematic configuration diagram showing a fifth embodiment of a light emitting device according to the present invention. First perspective view showing a sixth embodiment of a light flux controlling member according to the present invention. 28 is a second perspective view of the light flux controlling member of FIG. 28 is a schematic configuration diagram showing an external illumination type illumination device to which the light flux controlling member of FIG. 28 is applied. Schematic diagram showing the illuminance distribution on the illuminated surface when the light flux controlling member of the sixth embodiment is used for illumination of the illuminated surface. The perspective view which shows an example of the conventional light beam control member 32 is a front view of the light flux controlling member of FIG. The top view of FIG. The bottom view of FIG. Schematic configuration diagram showing an example of a conventional light emitting device Schematic configuration diagram showing an example of a conventional external illumination device Schematic diagram showing the illuminance distribution on the irradiated surface in the case of performing illumination using the illumination device of FIG. Schematic configuration diagram showing an example of a conventional double-sided interior illumination device Schematic configuration diagram showing an example of a conventional single-sided interior illumination device Schematic diagram showing the overall illumination distribution on the illuminated surface formed by a plurality of light emitting devices

(First embodiment)
(Form of light flux controlling member and light emitting device)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  Note that portions having the same or similar basic configuration as those in the related art will be described using the same reference numerals.

  Here, FIG. 1 is a perspective view of the light flux controlling member 30 in the present embodiment. FIG. 2 is a front view of the light flux controlling member 30. FIG. 3 is a right side view of FIG. FIG. 4 is a bottom view of FIG. FIG. 5 shows a longitudinal sectional view (longitudinal sectional view including the optical axis OA) of the light flux controlling member 30 together with the light emitting element 2 such as an LED. FIG. 5 shows the light emitting device 31 in the present embodiment. This corresponds to the configuration diagram of FIG. In FIG. 5, the light emitting element 2 has a light flux controlling member in a state where the center axis (center light) of light emitted from the light emitting element 2 is aligned with the optical axis OA of the light flux controlling member 30. 30 is arranged oppositely.

As shown in FIGS. 1 to 5, the light flux controlling member 30 in the present embodiment is a concave portion 5 formed on the light emitting element facing surface portion on the light emitting element 2 side in the optical axis OA direction, similarly to the conventional light flux controlling member 1. And an exit surface 8 formed at the end opposite to the light emitting element 2 in the optical axis OA direction, and an outer peripheral surface 10 formed between the recess 5 and the exit surface 8. Are formed with a first incident surface 6 on which the first light L ₁ is incident and a second incident surface 7 on which the second light L ₂ is incident, and on the outer peripheral surface 10, a total reflection surface 11 is formed. .

  However, the light flux controlling member 30 in the present embodiment is different from the conventional one, and the emitting function part is formed on the outer peripheral surface 10 and the recessed part 5.

  Specifically, as shown in FIGS. 1 to 5, the wall portion 30 a (see FIG. 5) of the light flux controlling member 30 (light flux controlling member body) sandwiched between the inner circumferential surface and the outer circumferential surface 10 of the recess 5. Of these, the light emitting element facing surface portion (the lower end portion in FIG. 5) has a notch that reduces the thickness of the wall portion 30a over the predetermined formation angle range around the optical axis OA (in this embodiment, the thickness is eliminated). A portion 32 is formed.

  More specifically, the notch 32 in the present embodiment penetrates through the wall 30a so as to reach from the outer peripheral surface 10 to the inner peripheral surface of the recess 5, and opens to the light emitting element facing surface portion side. It is formed in the groove. Hereinafter, the notch 32 in the present embodiment is referred to as a through groove 32. The formation angle range of the through groove 32 is, for example, a virtual straight line connecting one end of the through groove 32 in the circumferential direction (the direction around the optical axis OA) and the optical axis OA taken as an angle reference line (0 °). In this case, the angle range may be 90 ° from the reference line to the other side in the circumferential direction.

  More specifically, the through groove 32 has a fan shape concentric with the optical axis OA in the bottom view (FIG. 4), and the depth of the notch (the dimension in the direction of the optical axis OA) It is constant at all positions within the 32 forming angle range.

  And in this embodiment, such a through-groove 32 functions as an output function part.

That is, as shown in FIG. 5, the through groove 32 is formed as the third light L ₃ (light beam) that forms part of the second light L ₂ (peripheral light beam) emitted from the light emitting element 2. The third light L ₃ on the peripheral side with respect to the other second light L ₂ incident on the second incident surface 7 within the same angle range as the formation angle range is formed through the space surrounded by the through groove 32. Let it pass. However, in the figure shows only third one light beam of the light L ₃ representatively.

Next, the third light L ₃ passing through the through groove 32 in this way is not totally reflected at the total reflection surface 11, and therefore does not reach the emission surface 8, and is closer to the light emitting element 2 than the emission surface 8. At this position, the light is emitted outside the outer peripheral surface 10.

At this time, the third light L ₃ is emitted in a larger angular direction with respect to the optical axis OA than the first light L ₁ and the second light L ₂ emitted from the emission surface 8. In other words, the third light L ₃ is emitted to the outside of the outer peripheral surface 10 while maintaining the emission angle from the light emitting element 2.

(External illumination device configuration)
Then, the light flux controlling member 30 of the present embodiment for forming such third optical path of the light L ₃ of, as in the conventional, can be applied to illumination of the outer Terushiki or internally illuminated.

  For example, FIG. 6 shows an external illumination type illumination device to which the light flux controlling member 30 in the present embodiment is applied, and this figure corresponds to the conventional FIG. As shown in FIG. 6, in this embodiment, the light flux controlling member 30 is arranged in a state where the optical axis OA is inclined with respect to the irradiated surface 15a, as in the conventional case. In the present embodiment as well, as in the prior art, a plurality of light flux controlling members 30 are arranged in the vertical direction in the drawing. Furthermore, as shown in FIG. 6, in the present embodiment, the light flux controlling member 30 is arranged with the through groove 32 facing the irradiated surface 15a. In addition, as for the penetration groove | channel 32, it is desirable for the center part in the circumferential direction to be located on the virtual plane perpendicular | vertical to the to-be-irradiated surface 15a containing optical axis OA.

In such an external lighting type illumination device of the present embodiment, as shown in FIG. 6, the third light L ₃ passing through the through groove 32 is in the region near the light flux controlling member 30 on the irradiated surface 15a. Will be irradiated. Although not shown, the first light L ₁ and the second light L ₂ emitted from the emission surface 8 are more from the light flux controlling member 30 than the irradiation region of the third light L _{3 on} the irradiated surface 15 a. A far field is irradiated. This is because the third light L ₃ is by that the angle of incidence on the first light L ₁ and the second irradiated surface 15a than the light L ₂ is small. In this way, the first to third lights L1 _to L3 can be distributed on the irradiated surface 15a in a well-balanced manner, and in particular, the amount of light in the region near the light source on the irradiated surface 15a, which has been considered a problem in the past, is insufficient. Can be effectively improved (reduced). In addition, being able to improve the shortage of light quantity in the vicinity of the light source means that light quantity unevenness (illuminance unevenness) on the illuminated surface 15a can be improved when viewed from the whole illuminated surface 15a.

  FIG. 7 schematically shows the effect of this embodiment as an illuminance distribution on the irradiated surface 15a. This figure corresponds to FIG. 38 of the prior art, and the outline thereof is the same as that described for FIG. As shown in FIG. 7, in the present embodiment, the area near the light flux controlling member 30 on the irradiated surface 15a (the vicinity of the lower end portion 9a in the rectangular area in the figure) is the inner side of the contour line on the most peripheral side in the figure. It turns out that it becomes. This indicates that the illuminance in the area in the vicinity of the light flux controlling member 30 on the irradiated surface 15a is sufficient, and that the shortage of light is improved compared to the conventional case (FIG. 38). Don't be.

(Internal illumination device configuration)
In addition to this, the light flux controlling member 30 in the present embodiment can be applied to, for example, a double-sided interior illumination device as shown in FIG. 8 as in the prior art, and as shown in FIG. The present invention can also be applied to a single-sided internal illumination type lighting device. In each of these internally-illuminated illumination devices, as in the prior art, the light beam control member 30 has the irradiated surfaces 17a, 18a, 25a with the optical axis OA parallel to the irradiated surfaces 17a, 18a, 25a. Are arranged opposite to each other. Further, the point that the light flux controlling member 30 is arranged with the through groove 32 facing the irradiated surfaces 17a, 18a, and 25a is the same as in the case of the external illumination type illumination device of FIG. However, as shown in FIG. 8 and FIG. 9, in the case of an internally-illuminated lighting device, since the holder 21 is provided outside the outer peripheral surface 10, the through groove 32 is exposed to the surface to be irradiated through the holder 21. It arrange | positions in the state which faces 17a, 18a, 25a. Further, as shown in FIG. 8, in the case of a double-sided internal illumination type illumination device, the light flux controlling member 30 has a through groove 32 with a diameter corresponding to the two irradiated surfaces 17a and 18a. It is effective in improving the illuminance unevenness to form at two positions facing each other in the direction.

In these cases the internal irradiation type illumination device, as in the case of external irradiation type lighting device of the present embodiment, by flow through the third light L ₃ by the through grooves 32, the irradiated surface 17a, 18a , 25a can be emitted. Here, in the case of the internal illumination type, since the holder 21 is provided outside the outer peripheral surface 10, the third light L ₃ passing through the through groove 32 passes through the holder 21 and then the irradiated surface 17 a. , 18a, 25a. Therefore, the light distribution characteristics of the third light L ₃ may be corrected by refracting or diffusing the third light L ₃ passing through the through groove 32 in the holder 21. When the third light L ₃ refraction or by diffusing to correct the light distribution characteristics, it is possible to suitably of a third irradiation position of the light L ₃ at the irradiated surface 17a, 18a, on 25a, the surface to be illuminated It is possible to make the illuminance uniform in the area near the light source in 17a, 18a, and 25a. In order to refract the third light L ₃ in the holder 21, for example, as shown in FIGS. 10 and 11, at least one of the outer peripheral surface and the inner peripheral surface of the holder 21 is set to the optical axis OA. What is necessary is just to form in the taper surface which has an inclination. Further, in order to diffuse the third light L ₃ at the holder 21 may be at least one roughening of the outer surface and the inner peripheral surface of the holder 21. In this way, even in the case of the internal illumination type illumination device, the third light L ₃ can be irradiated to the vicinity of the light flux controlling member 30 on the irradiated surfaces 17 a, 18 a, and 25 a by the through groove 32. Therefore, as in the case of the external illumination type, it is possible to effectively improve the light quantity shortage in the area near the light source on the irradiated surfaces 17a, 18a, and 25a.

The refractive or configured to diffuse the third light L ₃ by the holder 21, it may be applied to the lighting device SotoTerushiki.

  Further, the first emission surface 8 described above may not be a conical surface as long as it is a rotationally symmetric surface with the optical axis OA as an axis of symmetry, and may be a convex surface such as a spherical lens or an aspheric lens. .

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 12 to 16 with a focus on differences from the first embodiment.

  Here, FIG. 12 is a perspective view of the light flux controlling member 33 in the present embodiment. FIG. 13 is a front view of the light flux controlling member 33. Further, FIG. 14 is a right side view of FIG. FIG. 15 is a bottom view of FIG. FIG. 16 is a longitudinal sectional view of the light flux controlling member 33 (longitudinal sectional view including the optical axis OA) together with the light emitting element 2. FIG. 16 is a configuration diagram of the light emitting device 34 in the present embodiment. Equivalent to.

  The difference of this embodiment from the first embodiment is the specific configuration of the emission function unit. That is, as shown in FIGS. 12 to 16, the optical axis OA is formed as a notch portion in the present embodiment at the end of the outer peripheral surface 10 on the optical element 2 side (light emitting element facing surface side) in the optical axis OA direction. A planar emitting portion 35 parallel to the optical axis OA over a predetermined angular range around is recessed so as to cut off a part of the outer peripheral surface 10. The planar emitting portion 35 has a substantially half-moon shape in the right side view (FIG. 14), the end on the light emitting element 2 side is formed in an arc shape, and the end on the opposite side to the light emitting element 2 is in a chord shape. Is formed. In addition, the end on the light emitting element 2 side in the flat emission part 35 is positioned on the end on the light emitting element 2 side in the outer peripheral surface 10. And in this embodiment, such a plane emission part 35 functions as an emission function part.

That is, as shown in FIG. 16, the third light L ₃ is incident on the planar emitting portion 35 from the inside of the light flux controlling member 33 after being incident on the second incident surface 7. Then, the flat emission unit 35 refracts the incident third light L ₃ and emits it to the outside of the outer peripheral surface 10. At this time, the flat emission unit 35 emits the third light L ₃ in a larger angle direction with respect to the optical axis OA than the first light L ₁ and the second light L ₂ emitted from the emission surface 8. Let

The light flux controlling member 33 in the present embodiment provided with such a flat emission part 35 was applied to either external illumination or internal illumination (both sides / single side) illumination, as in the first embodiment. Even in this case, it is possible to irradiate the third light L ₃ on the irradiated surfaces 15a, 17a, 18a, and 25a in the vicinity of the light flux controlling member 33. Therefore, in this embodiment as well, as in the first embodiment, it is possible to effectively improve the light quantity shortage in the area near the light source on the irradiated surfaces 15a, 17a, 18a, and 25a.

Furthermore, (in other words, the irradiated surface 15a, 17a, 18a, the angle of incidence with respect to 25a) traveling direction of the third optical _{L 3} by refraction in the plane emitting part 35 can be controlled, and without providing the holder 21 both can be achieved irradiated surface 15a, 17a, 18a, a third preferred of the irradiation position of the light _{L 3} on 25a. However, the traveling direction of the light L ₃ may be further corrected by the holder 21.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. 17 to 21 with a focus on differences from the first embodiment.

  Here, FIG. 17 is a perspective view of the light flux controlling member 37 in the present embodiment. FIG. 18 is a front view of the light flux controlling member 37. Further, FIG. 19 is a right side view of FIG. Furthermore, FIG. 20 is a bottom view of FIG. FIG. 21 is a longitudinal sectional view (longitudinal sectional view including the optical axis OA) of the light flux controlling member 37 together with the light emitting element 2. FIG. 21 is a configuration diagram of the light emitting device 38 in the present embodiment. Equivalent to.

  The difference of this embodiment from the first embodiment is also the specific configuration of the emission function unit. That is, as shown in FIGS. 17 to 21, the end portion on the optical element 2 side in the optical axis OA direction of the outer peripheral surface 10 covers a predetermined angular range around the optical axis OA as a notch portion in the present embodiment. A curved surface emitting portion 39 shaped like a part of a spherical surface is recessed so as to cut out a part of the outer peripheral surface 10. In the right side view (FIG. 19), the curved surface emitting portion 39 has a substantially elliptical shape that is long in the direction orthogonal to the optical axis OA, and the end on the light emitting element 2 side emits light on the outer peripheral surface 10. It is located on the end on the element 2 side. In the present embodiment, such a curved surface emitting section 39 functions as an emitting function section.

That is, as shown in FIG. 21, the third light L ₃ is incident on the curved surface emitting portion 39 from the inside of the light flux controlling member 37 after being incident on the second incident surface 7. Since the curved surface emitting portion 39 is formed in a concave curved surface, the incident third light L ₃ is diverged and refracted by the same function as the concave lens surface and is emitted to the outside of the outer peripheral surface 10. At this time, the curved surface emitting section 39 emits the third light L ₃ in a larger angular direction with respect to the optical axis OA than the first light L ₁ and the second light L ₂ emitted from the emission surface 8. Let

The light flux controlling member 37 in this embodiment provided with such a curved surface emitting portion 39 was applied to either external illumination or internal illumination (both sides / single side) illumination, as in the first embodiment. Even in this case, it is possible to irradiate the third light L ₃ on the irradiated surfaces 15 a, 17 a, 18 a, and 25 a in the vicinity of the light beam control member 37. Therefore, in this embodiment as well, as in the first embodiment, it is possible to effectively improve the light quantity shortage in the area near the light source on the irradiated surfaces 15a, 17a, 18a, and 25a.

Further, it is possible to widen the third light flux diameter of the light _{L 3} by the divergence of the curved exit section 39, without providing the holder 21, the irradiated surface 15a, 17a, 18a, the third light _{L 3} at 25a The irradiation area can be enlarged. However, the traveling direction of the third light L ₃ may be further corrected using the holder 21.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 22 to 25 with a focus on differences from the first embodiment.

  Here, FIG. 22 is a front view of the light flux controlling member 41 in the present embodiment. FIG. 23 is a right side view of FIG. Further, FIG. 24 is a bottom view of FIG. Furthermore, FIG. 25 shows a longitudinal sectional view (longitudinal sectional view including the optical axis OA) of the light flux controlling member 41 together with the light emitting element 2, which is a configuration diagram of the light emitting device 42 in the present embodiment. It corresponds to.

  The difference of this embodiment from the first embodiment is also the specific configuration of the emission function unit. That is, as shown in FIGS. 22 to 25, the end of the outer peripheral surface 10 on the optical element 2 side (light emitting element facing surface portion side) in the optical axis OA direction has an outer periphery over a predetermined angular range around the optical axis OA. An outer peripheral surface roughened portion 43 formed by roughening a part of the surface 10 is formed. The outer peripheral surface roughened portion 43 has an isosceles trapezoidal shape in which the upper base is longer than the lower base in the right side view (FIG. 23), and the end portion (lower side) on the light emitting element 2 side. Bottom) is positioned on the end of the outer peripheral surface 10 on the light emitting element 2 side. Moreover, the outer peripheral surface roughening part 43 is exhibiting the fan shape in a bottom view (FIG. 24). Such an outer peripheral surface roughening portion 43 can be realized by a mold shape (in the case of resin molding), glass etching, or the like. And in this embodiment, such an outer peripheral surface roughening part 43 functions as an output function part.

That is, as shown in FIG. 25, the third light L ₃ enters the outer peripheral surface roughening portion 43 from the inner side of the light flux controlling member 41 after entering the second incident surface 7. Then, the outer peripheral surface roughening part 43 diffuses the incident third light L ₃ and emits it to the outside of the outer peripheral surface 10. At this time, the outer peripheral surface roughening portion 43 causes the third light L ₃ to have a larger angle with respect to the optical axis OA than the first light L ₁ and the second light L ₂ emitted from the emission surface 8. The light is emitted in the direction.

The light flux controlling member 41 in this embodiment provided with such an outer peripheral surface roughening portion 43 is used for either external illumination or internal illumination (both sides / single side) illumination, as in the first embodiment. Even when it is applied, it is possible to irradiate the third light L ₃ on the irradiated surfaces 15 a, 17 a, 18 a, and 25 a in the vicinity of the light flux controlling member 41. Therefore, in this embodiment as well, as in the first embodiment, it is possible to effectively improve the light quantity shortage in the area near the light source on the irradiated surfaces 15a, 17a, 18a, and 25a.

Further, it is possible to equalize the third amount of light L ₃ emitted from the outer peripheral surface roughened portion 43 by the diffusion of the outer peripheral surface roughened portion 43, without providing the holder 21, the surface to be illuminated The illuminance of the area near the light source in 15a, 17a, 18a, and 25a can be made uniform. However, the traveling direction of the third light L ₃ may be further corrected using the holder 21.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 26 and 27, focusing on differences from the first embodiment.

  Here, FIG. 26 is a bottom view of the light flux controlling member 45 in the present embodiment. FIG. 27 shows a longitudinal sectional view (longitudinal sectional view including the optical axis OA) of the light flux controlling member 45 together with the light emitting element 2, which is a configuration diagram of the light emitting device 46 in the present embodiment. Equivalent to.

  The difference of this embodiment from the first embodiment is also the specific configuration of the emission function unit. That is, as shown in FIGS. 26 and 27, the end of the second incident surface 7 on the optical element 2 side (light emitting element facing surface side) in the optical axis OA direction extends over a predetermined angular range around the optical axis OA. An incident surface roughening portion 47 formed by roughening a part of the second incident surface 7 is formed. The incident surface roughening portion 47 has a fan shape in the bottom view (FIG. 26). Such an incident surface roughening portion 47 can be realized by a mold shape, glass etching, or the like. In the present embodiment, such an incident surface roughening portion 47 functions as an output function portion together with the outer peripheral surface 10.

That is, as illustrated in FIG. 27, the third light L ₃ emitted from the light emitting element 2 is incident on the incident surface roughening portion 47. Then, the incident surface roughening section 47 diffuses the incident third light L ₃ and emits it toward the outer peripheral surface 10. Then, the third light L ₃ emitted from the incident surface roughening portion 47 enters the outer peripheral surface 10 from the inner side of the light flux controlling member 45. At this time, since the third light L ₃ (light beam) is diffused in the incident surface roughening portion 47, the third light L ₃ (light beam) includes a light beam whose incident angle with respect to the outer peripheral surface 10 (total reflection surface 11) is less than the critical angle. Yes. Then, such rays, without being totally reflected at the outer peripheral surface 10, a large angular orientations with respect to the first light L ₁ and the second optical axis OA than the light L ₂ emitted from the emission surface 8 The light is emitted (transmitted) to the outside of the outer peripheral surface 10.

The light flux controlling member 45 in the present embodiment provided with such an incident surface roughening portion 47 is used for either external illumination or internal illumination (both sides / single side) illumination, as in the first embodiment. Even when it is applied, it is possible to irradiate the third light L ₃ on the irradiated surfaces 15a, 17a, 18a, and 25a in the vicinity of the light flux controlling member 45. Therefore, in this embodiment as well, as in the first embodiment, it is possible to effectively improve the light quantity shortage in the area near the light source on the irradiated surfaces 15a, 17a, 18a, and 25a.

Further, it is possible to equalize the third amount of light L ₃ emitted from the incident surface roughened portion 47 by diffusion in the incident surface roughening section 47, without providing the holder 21, the surface to be illuminated The illuminance of the area near the light source in 15a, 17a, 18a, and 25a can be made uniform. However, the traveling direction of the third light L ₃ may be further corrected using the holder 21.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIGS. 28 to 31 with a focus on differences from the first embodiment.

  Here, FIG. 28 is a perspective view of the light flux controlling member 50 in the present embodiment as seen from obliquely below. FIG. 29 is a perspective view of the light flux controlling member 50 as viewed from obliquely above.

  The difference of this embodiment from the first embodiment is in the specific configuration of the emission surface 8. In other words, as shown in FIGS. 28 and 29, the exit surface 8 deviates from the first angle range with the first exit surface 8a formed over a predetermined first angle range around the optical axis OA. And a second emission surface 8b formed over a predetermined second angular range around the optical axis OA. Here, the specific first angle range in the configuration of FIG. 6 is that a virtual straight line connecting one end portion in the circumferential direction of the first emission surface 8a and the optical axis OA is an angle reference line (0 °). The angle range is 180 ° from the reference line toward the other circumferential direction. In addition, the specific second angle range in the configuration of the figure is an angle range extending from 180 ° to 360 ° when the reference line (0 °) is taken at the same position as the first angle range. .

  Further, the first emission surface 8a is a rotationally symmetric surface assumed with the optical axis OA as the symmetry axis, and the end opposite to the light emitting element 2 in the direction of the optical axis OA is a predetermined surface vertex that intersects the optical axis OA. Are formed in a curved surface having a shape corresponding to a portion over the first angle range in the rotationally symmetric surface. More specifically, the first emission surface 8a in the configuration of FIGS. 28 and 29 is formed in a semi-conical surface shape that bisects the conical emission surface 8 in the first embodiment.

  Further, the second emission surface 8b is arranged at a position farther from the irradiated surfaces 15a, 17a, 18a, and 25a than the first emission surface 8a, and the shape of the emission surface 8 is changed to all angles around the optical axis OA. A predetermined shape that increases the amount of light emitted toward the irradiated surfaces 15a, 17a, 18a, and 25a as compared with the case of assuming a rotationally symmetric surface shape over a range (conical surface shape in the present embodiment). Is formed. More specifically, the second emission surface 8b in the configuration of FIG. 28 and FIG. 29 is relative to the optical axis OA that approaches the optical axis OA toward the opposite side of the light emitting element 2 in the optical axis OA direction. An inclined plane having an inclination, and an end side opposite to the light emitting element 2 intersects the surface apex of the first emission surface 8a on the optical axis OA, and the end side is separated from the optical axis OA. Accordingly, it is formed in an inclined plane so that the level difference from the first emission surface 8a becomes large.

  Furthermore, as shown in FIG. 28, the through groove 32 is formed at a position within a first angle range that is a formation angle range of the first emission surface 8a. More specifically, in the configuration shown in the figure, the central portion in the circumferential direction of the through groove 32 and the central portion in the circumferential direction of the first emission surface 8a are coincident with each other in the rotational angle position around the optical axis OA. Yes.

  Further, a step surface 8c parallel to the optical axis direction is formed at the step portion between the first exit surface 8a and the second exit surface 8b. The step surface 8c may be used for irradiating light onto the irradiated surfaces 15a, 17a, 18a, and 25a.

  For example, as shown in FIG. 30, the light flux controlling member 50 in the present embodiment is arranged with the first emission surface 8a facing the irradiated surface 15a, and is used for illumination of the irradiated surface 15a. It is like that.

  Here, FIG. 31 schematically shows an illuminance distribution on the illuminated surface 15a when the light flux controlling member 50 in the present embodiment is used for illumination of the illuminated surface 15a. The outline of this figure is the same as FIG. 7 of the first embodiment. As shown in FIG. 31, according to the present embodiment, it can be seen that the region inside the contour line on the most peripheral side in the figure is expanded in the horizontal direction compared to the case of FIG. 7. This is not only because the configuration of the present embodiment improves the shortage of light in the area near the light source on the irradiated surfaces 15a, 17a, 18a, and 25a, but also the light flux directed toward the irradiated surface 15a by the second exit surface 8b. This is nothing but to show that the area irradiated with a sufficient amount of light on the irradiated surface 15a can be enlarged.

  In addition, the structure of the output surface 8 in this embodiment is also disclosed in Japanese Patent Application No. 2010-145485 previously made by the present applicant. The application documents of the application include those having a part of the second emission surface as a steep slope (see FIG. 12 of the application), those having a first emission surface as an aspherical surface (see FIG. 16 of the application), etc. Although various modifications are described, these modifications can be appropriately employed in the present invention. In addition, the second emission surface 8b may be formed on a cylindrical surface or a toroidal surface.

(Modification of positional relationship between light emitting device and irradiated surface in external illumination and internal illumination devices)
In addition, when a plurality of light emitting devices are arranged at a wide pitch and the irradiated surfaces 15a, 17a, 18a, and 25a are irradiated by the light emitted from these light emitting devices, or the projection light axis is emitted by the light emitted from one light emitting device. On the other hand, when irradiating a wide range in the orthogonal direction, as shown in FIG. 41, positions corresponding to the light emitting devices on the irradiated surface (the horizontal direction of the region irradiated with the emitted light from one light emitting device) There is a risk that dark areas will occur.

  As described above, when it is necessary to improve the illuminance distribution by extending the irradiation area on the surface to be irradiated by the light emitted from one light emitting device in a direction orthogonal to the projection optical axis, the light emitted from the light flux controlling member 30 is emitted. The first virtual plane in which the function part 32, 35, 39, 43, 47 is not directed toward the irradiated surface, and the central part in the circumferential direction of the emitting functional part is perpendicular to the irradiated surface including the optical axis OA. It is desirable to be positioned on the second virtual plane that is orthogonal to the optical axis OA and includes the optical axis OA.

As described above, according to the present invention, the emission function unit 32, 35, 39, 43, 47 allows the third light L ₃ to be emitted at the position closer to the light emitting element 2 than the emission surface 8. it is possible to emit a large angular orientations with respect to the first light L ₁ and the second optical axis OA than the light L ₂ emitted from the third light L _3, the irradiated surface 15a, 17a can 18a, and irradiating the first light L ₁ and the second hard light L ₂ is irradiated region at 25a, to improve the light amount shortage in this region.

  In addition, this invention is not limited to embodiment mentioned above, A various change can be made in the limit which does not impair the characteristic of this invention.

2 Light-Emitting Element 5 Recess 6 First Entrance Surface 7 Second Entrance Surface 8 Outgoing Surface 10 Outer Outer Surface 11 Total Reflecting Surface 32 Through Groove (Notch)

Claims (8)

A light flux controlling member that irradiates light emitted from the light emitting element from an oblique direction with respect to the irradiated surface by controlling the light distribution characteristics thereof,
The light flux controlling member is
The light emitting element facing surface portion disposed to face the light emitting element, the emitting surface formed on the opposite side of the light emitting element with respect to the light emitting element facing surface portion, and the emission from the outer peripheral end of the light emitting element facing surface portion An outer peripheral surface extending toward the outer peripheral end of the surface,
In the light emitting element facing surface portion,
A recess is formed for allowing light emitted from the light emitting element to enter the light flux controlling member,
The recess is
A first incident surface that is formed as a plane perpendicular to the optical axis and on which the first light on the center side of the light emitted from the light emitting element is incident;
A second incident that extends from the outer peripheral end of the first incident surface toward the light emitting element, and in which the second light outside the first light out of the light emitted from the light emitting element is incident. And having a surface,
The outer peripheral surface is
The diameter gradually increases from the light emitting element facing surface side toward the exit surface side so that the second light incident on the second entrance surface is totally reflected toward the exit surface. Having a total reflection surface formed on
The exit surface is
The first light incident from the first incident surface and directly reached and the second light incident from the second incident surface and reached through the total reflection surface are emitted toward the irradiated surface,
On the outer peripheral surface ,
An emission function unit is formed that emits the third light that forms a part of the second light to the outside of the outer peripheral surface at a position closer to the light emitting element than the emission surface without reaching the emission surface. And
The emission function unit is
The third light, the so that is emitted in a large angle direction from the optical axis than the first light and said second light emitted from the exit surface, the inner periphery of the said outer peripheral surface recess A notch portion formed on the light emitting element facing surface portion side in the circumferential direction of the outer peripheral surface of the wall portion of the light flux controlling member main body sandwiched between the surfaces, or an outer peripheral surface roughening portion,
The notch is
A wall portion of the light flux controlling member main body sandwiched between the outer peripheral surface and the inner peripheral surface of the concave portion is a part of the circumferential direction of the outer peripheral surface and a predetermined portion on the light emitting element facing surface side of the wall portion. In order to reduce the thickness, it has a flat surface emitting portion that is recessed by being cut parallel to the optical axis or a curved surface emitting portion that is hollowed and recessed, and the third light is transmitted to the second incident surface. Is formed so as to be refracted at the flat emission part or refracted and diverged at the curved emission part to be emitted to the outside of the outer peripheral surface after being incident on the outer surface,
The outer peripheral surface roughened portion is
A portion of the outer peripheral surface in the circumferential direction and a predetermined portion on the light emitting element facing surface portion side is roughened, and the third light is incident on the second incident surface and then the outer peripheral roughened portion. A light flux controlling member, wherein the light flux controlling member is formed so as to be emitted outside the outer peripheral surface . The emission function unit is
Further comprising an incident roughened portion roughened predetermined portion of the light emitting element facing surface side of the second incident surface, the third light, the by diffusing in the incident roughened portion The light flux controlling member according to claim 1 , wherein the light flux is transmitted to the outside of the outer peripheral surface. Outside the outer peripheral surface,
A holder for holding the light flux controlling member body is disposed,
The holder is
By refracting or diffusing the third light emitted from the emitting functional part, the light flux controlling member according to claim 1 or 2, characterized in that to correct the light distribution characteristics of the third light. A light emitting element that emits light;
A light flux controlling member according to any one of claims 1 to 3 ,
The light emitting device, wherein the light emitting element is disposed at a position facing the concave portion of the light flux controlling member in a state where a central axis of the light coincides with an optical axis of the light flux controlling member. A light emitting device according to claim 4 ;
An illuminated surface on which light is emitted by the light emitting device, and
The light flux controlling member of the light emitting device is disposed in a state where the emission function portion is directed to the irradiated surface side. A light emitting device according to claim 4 ;
An illuminated surface on which light is emitted by the light emitting device, and
The light flux controlling member of the light emitting device is disposed in a state where the emission function unit is away from the irradiated surface. It is an external lighting device,
The luminous flux control member is configured such that, of the emitted light from the luminous flux control member that irradiates the irradiated surface, the emitted light having a larger angle with respect to the optical axis is more than the emitted light having a smaller angle with respect to the optical axis. The illuminating device according to claim 5 or 6 , wherein the illumination device is arranged in an inclined state with respect to the irradiated surface so that an incident angle to the irradiated surface is reduced. It is an internally illuminated lighting device,
The luminous flux control member is configured such that, of the emitted light from the luminous flux control member that irradiates the irradiated surface, the emitted light having a larger angle with respect to the optical axis is more than the emitted light having a smaller angle with respect to the optical axis. The illumination device according to claim 5 or 6 , wherein the illumination device is arranged in a state in which an incident angle to an irradiated surface is small.

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