Light distribution control lenses and lighting fixtures

Abstract

The present invention provides a light distribution control lens and lighting fixture that increase the desired light distribution components in two directions: vertical and horizontal, relative to the display unit. [Solution] The light distribution control lens comprises an incoming light surface into which light from a light source is incident, and an outgoing light surface that emits the light incident on the incoming light surface to the outside. The incoming light surface has a first incoming light surface that deflects the light from the light source at an angle inclined with respect to the optical axis of the light source, and a second incoming light surface provided closer to the optical axis than the first incoming light surface and deflects the light from the light source along the optical axis. The outgoing light surface has a first outgoing light surface that emits the light from the first incoming light surface to the outside at an angle inclined with respect to the optical axis, and a second outgoing light surface provided closer to the optical axis than the first outgoing light surface and emits the light from the second incoming light surface along the optical axis.

Description

Technical Field

[0001] The present disclosure relates to a light distribution control lens that controls the light distribution of light irradiated from a light source, and a lighting fixture including the light distribution control lens.

Background Art

[0002] Conventionally, a flashing induction lamp is known as a lighting fixture. The flashing induction lamp is used to flash light in an emergency to indicate the evacuation direction. The light source provided in the flashing induction lamp may be attached to a surface parallel to the display portion of the induction lamp or to a lower surface orthogonal to the display portion of the induction lamp. That is, the light emission direction is in two directions, a vertical direction and a horizontal direction, with respect to the display portion of the induction lamp. Here, regardless of the position where the light source is attached, it is necessary to satisfy the light distribution distribution defined in JIL5502-2008 Amendment Supplement defined by the Japan Lighting Industry Association. Usually, lenses with an optimal shape are designed for each mounting position, and two lenses are required. Patent Document 1 discloses a lens that controls two-directional light distribution with one lens. The lens of Patent Document 1 is formed of a smooth curved surface that is oval when viewed from the front on the light incident surface side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] s [[ID=三十五]]However, the lens disclosed in Patent Document 1 is formed of a smooth curve, which is desirable from the viewpoint of processing stability, but the components of light extracted in an oblique direction different from the light distribution components for the purpose of the two directions, the vertical direction and the horizontal direction, with respect to the display portion increase.

[0005] This disclosure was made to solve the above-mentioned problems and provides a light distribution control lens and lighting fixture that increase the desired light distribution components in two directions, vertical and horizontal, relative to the display unit. [Means for solving the problem]

[0006] The light distribution control lens according to this disclosure comprises an incoming light surface into which light from a light source is incident, and an outgoing light surface that emits the light incident on the incoming light surface to the outside, wherein the incoming light surface has a first incoming light surface that deflects the light from the light source at an angle inclined with respect to the optical axis of the light source, and a second incoming light surface provided on the optical axis side of the first incoming light surface and deflects the light from the light source along the optical axis, wherein the outgoing light surface has a first outgoing light surface that emits the light from the first incoming light surface to the outside at an angle inclined with respect to the optical axis, and a second outgoing light surface provided on the optical axis side of the first outgoing light surface and emits the light from the second incoming light surface along the optical axis. [Effects of the Invention]

[0007] According to this disclosure, the first and second light-receiving surfaces divide the light from the light source into two directions after it passes through the light-receiving surfaces. The first and second light-emitting surfaces then distribute the light divided into two directions. This suppresses the oblique component and increases the desired light distribution components in the vertical and horizontal directions relative to the display unit. [Brief explanation of the drawing]

[0008] [Figure 1] This is an exploded perspective view showing a lighting fixture according to Embodiment 1. [Figure 2] These are a top view, front view, and side view of the light distribution control lens according to Embodiment 1. [Figure 3] This is a top view showing the shape of the light-receiving surface according to Embodiment 1. [Figure 4] This is a top view showing the shape of the light-receiving surface according to a modified example of Embodiment 1. [Figure 5]This is a front view showing the light source module and light distribution control lens according to Embodiment 1. [Figure 6] This is a top view showing the light source module and light distribution control lens according to Embodiment 1. [Figure 7] This is a side view showing the light source module and light distribution control lens according to Embodiment 1. [Figure 8] This is a graph showing the light distribution of a lighting fixture according to Embodiment 1. [Figure 9] These are a top view, a front view, and a side view of the light distribution control lens according to Embodiment 2. [Figure 10] This is a front view showing the light source module and light distribution control lens according to Embodiment 2. [Figure 11] This is a graph showing the light distribution of a lighting fixture according to Embodiment 2. [Modes for carrying out the invention]

[0009] The embodiments of the light distribution control lens and lighting fixture according to the embodiment will be described below with reference to the drawings. However, the embodiments described below are not limited to those described below. Also, the relationships of the sizes of the components in the following drawings, including Figure 1, may differ from those of the actual components. Furthermore, in the following description, terms indicating direction will be used as appropriate to facilitate understanding, but these are for illustrative purposes only and are not limited to these terms. Examples of terms indicating direction include "up," "down," "right," "left," "front," or "back."

[0010] Embodiment 1. Figure 1 is an exploded perspective view showing a lighting fixture 10 according to Embodiment 1. The lighting fixture 10 is a flashing type emergency exit sign used, for example, to flash light in an emergency to indicate the direction of evacuation. As shown in Figure 1, the lighting fixture 10 comprises a housing 4, a support base 3, a light source module 1, and a light distribution control lens 2.

[0011] (Cabinet 4) The housing 4 has a flat display portion 4a and side surface portions 4b that extend perpendicularly to the display portion 4a from both end portions of the display portion 4a. A circular opening 4c is formed in the central portion of one of the side surface portions 4b, and the light distribution control lens 2 is exposed to the outside from the opening 4c. Although a power circuit for supplying power to the light source module 1 is provided in the housing 4, illustration thereof is omitted. Further, a display board of a blinking indicator light is provided on the display portion 4a of the housing 4, but illustration thereof is omitted. The housing 4 is attached to an attachment portion such as a wall so that the z direction is vertically downward.

[0012] (Support base 3) The support base 3 supports the light source module 1 and the light distribution control lens 2, and in a state integrated with the light source module 1 and the light distribution control lens 2, it is attached near the opening 4c of the side surface portion 4b of the housing 4 using screws or the like. Thereby, the light distribution control lens 2 is arranged such that the light emitting surface 40 protrudes from the opening 4c and is integrated with the housing 4.

[0013] (Light source module 1) The light source module 1 has a light source 11 and a substrate 12. The light source 11 is composed of, for example, an LED (Light Emitting Diode) or the like. The LED is a light emitting element that emits white light, which is a combined light of blue light and yellow light converted from blue light, with a phosphor for wavelength-converting blue light to yellow light provided on an LED chip that emits blue light of about 440 nm to 480 nm. Four light sources 11 are mounted in a grid pattern on the substrate 12, and the substrate 12 is, for example, a plate-shaped aluminum substrate. A circuit pattern for power supply is formed on the substrate 12, and elements such as diodes (not shown) other than the LEDs used as the light sources 11 are mounted thereon.

[0014] (Light distribution control lens 2) The light distribution control lens 2 is a transparent resin lens that controls the light distribution of the light irradiated from the light source 11. The light distribution control lens 2 is arranged so as to be in contact with the arrangement surface of the light source 11 on the substrate 12. The light distribution control lens 2 has mounting holes, and is fixed to the support base 3 using screws or the like with the substrate 12 of the light source module 1 sandwiched therebetween. In the first embodiment, the positional error between the light source module 1 and the light distribution control lens 2 that may occur during assembly can be minimized, so that the variation in optical performance can be minimized.

[0015] FIG. 2 is a top view, a front view, and a side view of the light distribution control lens 2 according to the first embodiment. FIG. 2(a) is a top view (x-y plane view) of the light distribution control lens 2, FIG. 2(b) is a front view (x-z plane view) of the light distribution control lens 2, and FIG. 2(c) is a side view (y-z plane view) of the light distribution control lens 2. As shown in FIG. 2, the light distribution control lens 2 includes a light incident surface 19 on which light from the light source 11 is incident, and a light emitting surface 40 that emits the light incident on the light incident surface 19 to the outside. P1, P2, P3, and P4 in FIGS. 2(a) and 2(c) are contour lines on the light incident surface 19 side, and P5, P6, P7, and P8 in FIGS. 2(a) and  2(b) are contour lines on the light emitting surface 40 side.

[0016] (Light incident surface 19) As shown in FIG. 2(c), the light incident surface 19 has a concave shape. The contour line P1 shows the shape of the bottom of the light incident surface 19, and as shown in FIG. 2(a), it has a curved diamond shape that is short in the x direction and long in the y direction. The contour line P2 is a diamond shape that is similar to the contour line P and is one size smaller, and is arranged inside the contour line P1. The contour line P3 is arranged inside the contour line P2 and has a substantially circular shape. The contour line P4 is arranged inside the contour line P3 and has a substantially circular shape with a smaller radius than the contour line P3.

[0017] Figure 3 is a top view showing the shape of the light-receiving surface 19 according to Embodiment 1. As shown in Figure 3, the corners 15 of the rhombus shape of the light-receiving surface 19 are rounded (R-shaped). This allows the cutout on the housing 4 side to be a simple circular shape, making processing easier. Furthermore, by making the light-receiving surface 19 rhombus-shaped and the light-emitting surface 40 arc-shaped, the processability of the light distribution control lens 2 can be maintained. Here, the light source 11 is provided inside the light-receiving surface 19.

[0018] Figure 4 is a top view showing the shape of the light-receiving surface 19 according to a modified example of Embodiment 1. As shown in Figure 4, the corners 15 of the rhombus shape of the light-receiving surface 19 may not be arc-shaped, but may also have planar shapes added, and each face of the light-receiving surface 19 may be composed of a plane.

[0019] As shown in Figure 2(c), the bottom surface 21 of the light distribution control lens 2, from the outer peripheral edge of the bottom to contour line P1, is a plane parallel to the xy plane. The first light-receiving surface 20 is composed of an outer light-receiving surface 22 enclosed by contour lines P1 and P2, and an inner light-receiving surface 23 enclosed by contour lines P2 and P3. As shown in Figure 2(b), the first light-receiving surface 20 is inclined at an angle of 10° to 20° with respect to the optical axis (z direction). The outer light-receiving surface 22 is a gently sloping surface in the yz plane (Figure 2(c)), but a steeply sloping surface in the xz plane (Figure 2(b)). Similarly, the inner light-receiving surface 23 is a gently sloping surface in the yz plane (Figure 2(c)), but a steeply sloping surface in the xz plane (Figure 2(b)). The third light-receiving surface 24, which has the shape of a frustum of a cone enclosed by contour lines P3 and P4, has a gentler slope than the first light-receiving surface 20. The second light-receiving surface 25, which extends from contour line P4 to the center of the light distribution control lens 2, has the shape of a cone with an angle approximately parallel to the xy plane. That is, the third light-receiving surface 24 is located between the first light-receiving surface 20 and the second light-receiving surface 25. The second light-receiving surface 25 is inclined at an angle of 0° to 10° with respect to the direction perpendicular to the optical axis (z direction) (xy plane).

[0020] (Idemitsu surface 40) As shown in Figure 2(b), the flange surface 26 from the outer edge of the bottom of the light distribution control lens 2 to contour line P5 is a plane parallel to the xy plane. The radius of contour line P6 is slightly smaller than the radius of contour line P5, and the wall surface 27 from contour line P5 to contour line P6 is inclined at approximately 2° with respect to the z direction. The first light-emitting surface 28 from contour line P6 to contour line P7 is an inclined surface tilted at an average angle of approximately 25° with respect to the xy plane. The second light-emitting surface 29 from contour line P7 to contour line P8 is an inclined surface tilted at an average angle of approximately 20° with respect to the xy plane.

[0021] Furthermore, the second light-emitting surface 29 is continuously formed from contour line P7 to contour line P8, alternating between inclination angles smaller than the average inclination angle and inclination angles larger than the average inclination angle. In particular, near contour line P7, the inclination angle initially approaches the xy-plane, and then gradually increases towards contour line P8 near the vertex. Contour line P8 is not a perfect point, but an extremely small circle, and near the vertex, it has a radius of curvature that is parallel to the xy-plane.

[0022] Figure 5 is a front view showing the light source module 1 and light distribution control lens 2 according to Embodiment 1. As shown in Figure 5, the top surface of the housing 4 is positioned so as not to exceed the wall surface 27 on the light-emitting surface 40 side of the light distribution control lens 2. The space formed between the housing 4 and the contour line P5 of the light distribution control lens 2 is the space in which a connector (not shown) that supplies power to the light source module 1 is located.

[0023] In Figure 5, the arrows indicate the trajectories of light rays from near the center of the light source 11. Ray L1 (point) represents a group of light rays traveling approximately parallel to the xy-plane centered in the x-direction. Ray L2 (shaded line) represents a group of light rays traveling approximately parallel to the yz-plane centered in the z-direction. That is, ray L1 represents the group of light rays applied when the light source module 1 is mounted perpendicular to the display unit 4a of the lighting fixture 10, and ray L2 represents the group of light rays applied when the light source module 1 is mounted parallel to the display unit 4a of the lighting fixture 10.

[0024] The light ray L1 is mainly composed of the following two types of light: The first is light that passes through the upper two-thirds of the incoming outer surface 22 and is transmitted through the portion of the first outgoing surface 28 that is close to the contour line P6. The second is light that passes through the incoming inner surface 23 and is transmitted through the portions of the first outgoing surface 28 and the second outgoing surface 29 that are close to the contour line P7 and are nearly parallel to the xy plane. In particular, the contribution of the amount of light passing through the incoming inner surface 23 of the first incoming surface 20 is large, and as mentioned above, the inclination angle of the incoming inner surface 23 is preferably 10° to 20° with respect to the z direction.

[0025] The light ray L2 is composed of light that passes through the second light-receiving surface 25, which is an inclined surface with an inclination close to the xy-plane, and transmits light from the portion of the second light-emitting surface 29 that is close to the contour line P8. As mentioned above, the inclination of the second light-receiving surface 25 is preferably 0° to 10° with respect to the z direction, and in this embodiment 1 it is 5°.

[0026] Light passing through the third light-receiving surface 24 exits in an oblique direction that does not correspond to either ray L1 or ray L2. Since oblique light is not very necessary, it is preferable to make the distance between the third light-receiving surface 24, i.e., between contour lines P3 and P4, as small as possible. Alternatively, the third light-receiving surface 24 may be eliminated, and the light-receiving inner surface 23 and the second light-receiving surface 25 may be directly connected. In this case, although unused light will be generated in the region where the light-receiving inner surface 23 and the second light-receiving surface 25 are connected, it is thought that the light utilization efficiency will be equivalent to that when the third light-receiving surface 24 is present.

[0027] As explained above, the first light-receiving surface 20 deflects the light from the light source 11 at an angle inclined with respect to the optical axis of the light source 11, and the second light-receiving surface 25 is located closer to the optical axis than the first light-receiving surface 20 and deflects the light from the light source 11 along the optical axis. The first light-emitting surface 28 emits the light from the first light-receiving surface 20 to the outside at an angle inclined with respect to the optical axis, and the second light-emitting surface 29 is located closer to the optical axis than the first light-emitting surface 28 and emits the light from the second light-receiving surface 25 along the optical axis.

[0028] Figure 6 is a top view showing the light source module 1 and light distribution control lens 2 according to Embodiment 1. In Figure 6, the group of light rays consisting of rays R0 to R9 is shown only for rays that are emitted from a light source point near the center of the light distribution control lens 2, pass through the light-receiving outer surface 22, and are transmitted further from the first light-emitting surface 28 in the direction of the xy plane. Also, with the x direction as the front, only the first quadrant is shown, with ray R0 at the 0° direction, ray R1 at the 10° direction, and so on, in increments of approximately 10° up to the 90° direction of ray R9. The shape of the light-receiving surface 19 and the shape of the light-emitting surface 40 are symmetrical with respect to the x and y directions, respectively. Therefore, by folding and duplicating rays R0 to R9 with respect to the x and y directions, it is possible to create rays that travel in all directions.

[0029] Furthermore, because the light-receiving surface 19 has a rhombus shape, light rays with a larger angle to the x-direction are deflected in the x-direction. In other words, by fixing the shape of the light-emitting surface 40 to be circular and adjusting the rhombus shape of the light-receiving surface 19, the light is concentrated towards the x-direction overall, and the amount of light traveling in the y-direction is reduced.

[0030] As shown in Figure 6, although the light rays R0 to R7 are distributed at roughly equal intervals, the light rays R8 and R9 intersect at the corner 15 (acute angle) of the rhombus shape. The light rays from other light-emitting points exhibit generally similar behavior. When the light-receiving surface 19 is rhombus-shaped, more light converges in the x-direction than when it is a simple oval shape. Furthermore, as mentioned above, since the corner 15 of the rhombus shape is either an arc shape or a planar shape is added, it is possible to guide the light in the y-direction as shown in Figure 6.

[0031] Thus, the first light-emitting surface 28 emits light from the first light-receiving surface 20 at an angle inclined with respect to the optical axis and along the short axis of the rhombus, while the second light-emitting surface 29 emits light from the second light-receiving surface 25 along the optical axis and along the long axis of the rhombus.

[0032] Figure 7 is a side view showing the light source module 1 and light distribution control lens 2 according to Embodiment 1. Figure 7 shows the typical trajectory of a light ray L1 in the yz plane, with the light source point of the light ray being at a slightly distant position. With the z direction as the front, only the first quadrant is shown, with light ray V0 at the 0° direction, light ray V1 at the 10° direction, and so on, in increments of approximately 10° up to the 90° direction of light ray V9.

[0033] As shown in Figure 7, the light ray L1 is broadly divided into two groups: one extending from light rays V0 to V3, and the other extending from light rays V4 to V9. This is because the inclination of the light-receiving surface 19 changes significantly at contour line P3. Light rays V0 to V3 pass through the second light-receiving surface 25 and are extracted by transmitting through the second light-emitting surface 29. Light rays V4 to V7 pass through the light-receiving inner surface 23 or the third light-receiving surface 24 and are extracted by transmitting through the second light-emitting surface 29. Light rays V8 and V9 pass through the light-receiving outer surface 22 and are extracted by passing through the first light-emitting surface 28.

[0034] Figure 8 is a graph showing the light distribution of the lighting fixture 10 according to Embodiment 1. In Figure 8, the light distribution defined in the JIL5502-2008 Amendment Supplement is shown by a thick line, the light distribution in the xy plane is shown by a solid line, and the light distribution in the yz plane is shown by a dashed line. The light distribution in the xy plane is the light distribution when the light source module 1 is mounted perpendicular to the display unit 4a of the lighting fixture 10, and the light distribution in the yz plane is the light distribution when the light source module 1 is mounted parallel to the display unit 4a of the lighting fixture 10. As shown in Figure 8, all light distributions satisfy the conditions for light distribution defined in the JIL5502-2008 Amendment Supplement.

[0035] According to this embodiment 1, the light from the light source 11 is split into two directions by the first light-receiving surface 20 and the second light-receiving surface 25 after passing through the light-receiving surface 19. Then, the light that has been split into two directions is distributed by the first light-emitting surface 28 and the second light-emitting surface 29. This suppresses the oblique component and increases the desired light distribution components in the two directions, vertical and horizontal, relative to the display unit 4a. Furthermore, by making the third light-receiving surface 24 smaller, unwanted light that does not belong to either ray L1 or ray L2 can be reduced. In other words, in this embodiment 1, the ratio of the second light-receiving surface 25, which is aligned perpendicular to the optical axis, to the first light-receiving surface 20, which is aligned parallel to the optical axis, is increased, and the ratio of the third light-receiving surface 24, which is located between the first light-receiving surface 20 and the second light-receiving surface 25, is decreased. As a result, the light is largely split into two directions after passing through the light-receiving surface 19, and the light distribution of each ray can be controlled at the light-emitting surface 40.

[0036] Furthermore, because the light-receiving surface 19 has a rhombus shape, the light distribution of the light ray L1 in the xy plane can be adjusted. Also, since the light source 11 is located inside the light-receiving surface 19, the light-emitting point is located closer to the light-receiving surface 19, which improves the efficiency of light utilization regardless of the type of light source 11. For example, even if a light source 11 that emits light from the side is used, the light emitted from the light source 11 can be guided to the light-receiving surface 19, so the light can be used efficiently without waste. In contrast, in conventional lighting fixtures where the light-emitting surface and the lower end of the incident surface of the LED are at the same position, some of the light emitted from the side is wasted.

[0037] Embodiment 2. Figure 9 shows a top view, front view, and side view of the light distribution control lens 2a according to Embodiment 2. Based on Figure 9, the light distribution control lens 2a of Embodiment 2 will be described. In Embodiment 2, the shape of the light-emitting surface 40a of the light distribution control lens 2a differs from that of Embodiment 1. In Embodiment 2, parts common to Embodiment 1 are given the same reference numerals and their descriptions are omitted, and the description will focus on the differences from Embodiment 1.

[0038] Figure 9(a) is a top view (xy plan view) of the light distribution control lens 2a, Figure 9(b) is a front view (xz plan view) of the light distribution control lens 2a, and Figure 9(c) is a side view (yz plan view) of the light distribution control lens 2a. As shown in Figure 9, the light distribution control lens 2a includes an incoming light surface 19a into which light from the light source 11a enters, and an outgoing light surface 40a that emits the light incident on the incoming light surface 19a to the outside. Note that P1a, P2a, P3a, and P4a in Figures 9(a) and 9(c) are contour lines on the incoming light surface 19a side, and P5a, P6a, P7a, and P8a in Figures 9(a) and 9(b) are contour lines on the outgoing light surface 40a side. Here, the positional relationship of contour lines P1a to P6a is the same as in Embodiment 1. Furthermore, the shapes and positional relationships of the bottom surface 21a, the outer surface 22a, the inner surface 23a, the third light-receiving surface 24a, and the second light-receiving surface 25a on the light-receiving surface 19a are the same as in Embodiment 1. Moreover, the shapes and positional relationships of the flange surface 26a, the wall surface 27a, the first light-emitting surface 28a, and the second light-emitting surface 29a on the light-emitting surface 40a are the same as in Embodiment 1.

[0039] As shown in Figures 9(a) and 9(b), the light-emitting surface 40a of the light distribution control lens 2a has a first cut surface 30a, a second cut surface 31a, a third cut surface 32a, and a fourth cut surface 33a. The first cut surface 30a, the second cut surface 31a, the third cut surface 32a, and the fourth cut surface 33a are formed by cutting along the y-direction. The first cut surface 30a is connected to the first light-emitting surface 28a and is an inclined surface that is shifted slightly downward toward the center from the xy-plane. The second cut surface 31a is opposite to the first cut surface 30a and is cut almost perpendicular to the first cut surface 30a. The third cut surface 32a is connected to the second cut surface 31a and is an inclined surface that is shifted even further downward toward the center than the first cut surface 30a. The fourth cut surface 33a faces the third cut surface 32a and is cut almost perpendicular to the third cut surface 32a. The fourth cut surface 33a is connected to the second light-emitting surface 29a.

[0040] The first cut surface 30a, the second cut surface 31a, the third cut surface 32a, and the fourth cut surface 33a are formed by cutting in the y-direction of the conical surface. Therefore, when viewed from above, as shown in Figure 9(a), the first cut surface 30a, the second cut surface 31a, the third cut surface 32a, and the fourth cut surface 33a are all crescent-shaped.

[0041] Figure 10 is a front view showing the light source module 1a and light distribution control lens 2a according to Embodiment 2. In Figure 10, the arrows indicate the trajectories of light rays from near the center of the light source 11a. Light ray L1a (dot) represents a group of light rays that travel approximately parallel to the xy plane centered in the x direction. Light ray L2a (shaded line) represents a group of light rays that travel approximately parallel to the yz plane centered in the z direction. That is, light ray L1a represents the group of light rays that are applied when the light source module 1a is mounted on a part perpendicular to the display part 4a of the lighting fixture 10a. And light ray L2a represents the group of light rays that are applied when the light source module 1a is mounted on a part parallel to the display part 4a of the lighting fixture 10a.

[0042] In Embodiment 1, the light that passes through the third light-receiving surface 24 and reaches the second light-emitting surface 29 is radiated in a direction that does not belong to either ray L1 or ray L2. In Embodiment 2, a portion of the light that passes through the third light-receiving surface 24a is totally reflected at the third cut surface 32a and extracted as ray L3a that travels approximately parallel to the xy plane at the second cut surface 31a. In addition, a portion of the light that passes through the third light-receiving surface 24a is extracted as ray L4a that travels approximately parallel to the yz plane at the fourth cut surface 33a.

[0043] As explained above, the first cut surface 30a is connected to the first light-emitting surface 28a. The second cut surface 31a is located further from the optical axis than the third cut surface 32a and is cut to extend in the direction of the long axis of the rhombus. The second cut surface 31a emits the light that has been totally reflected at the third cut surface 32a at an angle inclined with respect to the optical axis and in the direction of the short axis of the rhombus. The third cut surface 32a faces the fourth cut surface 33a and totally reflects the light from the first light-receiving surface 20a. The fourth cut surface 33a is cut to extend in the direction of the long axis of the rhombus and emits the light from the third light-receiving surface 24a along the optical axis and in the direction of the long axis of the rhombus.

[0044] Figure 11 is a graph showing the light distribution of the lighting fixture 10a according to Embodiment 2. In Figure 11, the light distribution defined in the JIL5502-2008 Amended Supplement is shown by a thick line, the light distribution in the xy plane is shown by a solid line, and the light distribution in the yz plane is shown by a dashed line. The light distribution in the xy plane is the light distribution when the light source module 1a is mounted perpendicular to the display unit 4a of the lighting fixture 10a. The light distribution in the yz plane is the light distribution when the light source module 1a is mounted parallel to the display unit 4a of the lighting fixture 10a. As shown in Figure 11, all light distributions satisfy the conditions for light distribution defined in the JIL5502-2008 Amended Supplement. In addition, the luminous flux of the light source 11 in Figure 11 is 17% lower than the luminous flux of the light source 11 in Embodiment 1 in Figure 8. In other words, in this second embodiment, even if the luminous flux is reduced by 17% compared to the first embodiment, the conditions for light distribution specified in the revised supplement of JIL5502-2008 can be met.

[0045] According to this second embodiment, the light incident on the third light-receiving surface 24a can also be added to the desired light distribution components in two directions: vertical and horizontal with respect to the display unit 4a. Therefore, the efficiency of light utilization is further improved.

[0046] The various aspects of this disclosure are summarized below as an appendix. (Note 1) The light-receiving surface into which light from the light source enters, The system comprises a light-emitting surface that emits light incident on the light-receiving surface to the outside, The aforementioned light-receiving surface is A first light-receiving surface that deflects the light from the light source at an angle inclined with respect to the optical axis of the light source, It has a second light-receiving surface provided on the optical axis side of the first light-receiving surface, which deflects the light from the light source along the optical axis, The light-emitting surface is, A first light-emitting surface that emits light from the first light-receiving surface to the outside at an angle inclined with respect to the optical axis, It has a second light-emitting surface provided on the optical axis side of the first light-emitting surface, which emits light from the second light-receiving surface along the optical axis. Light distribution control lens. (Note 2) The aforementioned light-receiving surface is It has a rhombus shape, The first light-emitting surface emits light from the first light-receiving surface at an angle inclined with respect to the optical axis and along the short axis of the rhombus. The second light-emitting surface emits light from the second light-receiving surface along the optical axis and along the long axis of the rhombus. Light distribution control lens as described in Appendix 1. (Note 3) The aforementioned light-receiving surface is The present invention further includes a third light-receiving surface provided between the first light-receiving surface and the second light-receiving surface, The light-emitting surface is, It further has a fourth cut surface that extends in the direction of the long axis of the rhombus, The fourth cut surface is, The light from the third light-receiving surface is emitted along the optical axis and along the long axis of the rhombus. Light distribution control lens as described in Appendix 2. (Note 4) The light-emitting surface is, A third cut surface opposite the fourth cut surface, It has a second cut surface, which is provided at a position further from the optical axis than the third cut surface and is cut so as to extend in the direction of the long axis of the rhombus, The aforementioned third cut surface is It totally reflects the light from the first light-receiving surface, The second cut surface is, The light totally reflected at the third cut surface is emitted at an angle inclined with respect to the optical axis and along the short axis of the rhombus. Light distribution control lens as described in Appendix 3. (Note 5) The aforementioned rhombus is, The corners have a rounded shape. A light distribution control lens as described in any one of the appendices 2 to 4. (Note 6) The first light-receiving surface is, It is tilted at an angle of 10° to 20° with respect to the aforementioned optical axis. The second light-receiving surface is, It is tilted at an angle of 0° to 10° with respect to the direction perpendicular to the optical axis. A light distribution control lens as described in one of the appendices 1 to 5. (Note 7) The light source that emits light, A light distribution control lens as described in any one of the appendices 1 to 6, The aforementioned light-receiving surface has a concave shape. The light source is provided inside the light-receiving surface. Lighting fixtures. [Explanation of Symbols]

[0047] 1,1a Light source module, 2,2a Light distribution control lens, 3 Support base, 4 Housing, 4a Display unit, 4b Side section, 4c Opening, 10,10a Lighting fixture, 11,11a Light source, 12,12a Substrate, 15 Corner, 19,19a Light-receiving surface, 20,20a First light-receiving surface, 21,21a Bottom surface, 22,22a Light-receiving outer surface, 23,23a Light-receiving inner surface, 24,24a Third light-receiving surface, 25,25a Second light-receiving surface, 26,26a Flange surface, 27,27a Wall surface, 28,28a First light-emitting surface, 29,29a Second light-emitting surface, 30a First cut surface, 31a Second cut surface, 32a Third cut surface, 33a Fourth cut plane, 40,40a light output plane, P1,P2,P3,P4,P5,P6,P7,P8,P1a,P2a,P3a,P4a,P5a,P6a,P7a,P8a contour line, L1,L2,L1a,L2a,L3a,L4a ray.

Claims

1. The light-receiving surface into which light from the light source enters, The system comprises a light-emitting surface that emits light incident on the light-receiving surface to the outside, The aforementioned light-receiving surface is A first light-receiving surface that deflects the light from the light source at an angle inclined with respect to the optical axis of the light source, It has a second light-receiving surface provided on the optical axis side of the first light-receiving surface, which deflects the light from the light source along the optical axis, The light-emitting surface is, A first light-emitting surface that emits light from the first light-receiving surface to the outside at an angle inclined with respect to the optical axis, It has a second light-emitting surface provided on the optical axis side of the first light-emitting surface, which emits light from the second light-receiving surface along the optical axis. Light distribution control lens.

2. The aforementioned light-receiving surface is It has a rhombus shape, The first light-emitting surface emits light from the first light-receiving surface at an angle inclined with respect to the optical axis and along the short axis of the rhombus. The second light-emitting surface emits light from the second light-receiving surface along the optical axis and along the long axis of the rhombus. The light distribution control lens according to claim 1.

3. The aforementioned light-receiving surface is The present invention further includes a third light-receiving surface provided between the first light-receiving surface and the second light-receiving surface, The light-emitting surface is, It further has a fourth cut surface that extends in the direction of the long axis of the rhombus, The fourth cut surface is, The light from the third light-receiving surface is emitted along the optical axis and along the long axis of the rhombus. The light distribution control lens according to claim 2.

4. The light-emitting surface is, A third cut surface opposite the fourth cut surface, It has a second cut surface, which is provided at a position further from the optical axis than the third cut surface and is cut so as to extend in the direction of the long axis of the rhombus, The aforementioned third cut surface is It totally reflects the light from the first light-receiving surface, The second cut surface is, The light totally reflected at the third cut surface is emitted at an angle inclined with respect to the optical axis and along the short axis of the rhombus. The light distribution control lens according to claim 3.

5. The aforementioned rhombus is, The corners are rounded (R-shaped). A light distribution control lens according to any one of claims 2 to 4.

6. The first light-receiving surface is, It is tilted at an angle of 10° to 20° with respect to the optical axis. The second light-receiving surface is, It is tilted at an angle of 0° to 10° with respect to the direction perpendicular to the optical axis. A light distribution control lens according to any one of claims 1 to 4.

7. The light source that emits light, A light distribution control lens according to any one of claims 1 to 4, comprising The aforementioned light-receiving surface has a concave shape. The light source is provided inside the light-receiving surface. Lighting fixtures.

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