JP2020060691A - Lens, lighting device, and lighting apparatus - Google Patents

Abstract

To bias a distribution of light into a range between a direction of an optical axis and a desired direction intersecting with the optical axis.SOLUTION: A lens comprises a lens body made of a transparent material. The lens body includes: a recess concaved inwardly from a reference surface that is one surface of the lens body; an incidence surface 32 that is provided on the surface of the recess and to which light radiated from an LED module 2 is incident; and an emission surface that is provided on a surface opposite to the reference surface in the lens body and from which light incident from the incidence surface is emitted. The incidence surface has: a first incidence surface having a concavely-curved shape where curvature increases as the first incidence surface moves away from the reference surface; and a second incidence surface having a concavely-curved shape where the curvature decreases as the second incidence surface moves away from the reference surface. The emission surface is formed in a convexly-curved shape where curvature decreases as the emission surface moves away from the reference surface. The lens body includes a boundary line between the first incidence surface and the second incidence surface, and includes an optical axis of the LED module with respect to a boundary surface intersecting with the reference surface. An optical axis surface in parallel with the boundary surface is positioned on the side of the first incidence surface.SELECTED DRAWING: Figure 11

Description

  The present disclosure relates to a lens, a lighting device, and a lighting fixture. More specifically, the present disclosure relates to a lighting device that includes a lens that controls light distribution of a solid-state light source, a lighting device that includes the solid-state light source and the lens, and a lighting device and a lighting device body that supports the lighting device.

  As a conventional example, a lens and a lighting device described in Patent Document 1 will be illustrated. The luminaire described in Patent Document 1 contains a light emitting device having a lens, a battery, a lighting device that emits (lights) the light emitting device with electric power discharged from the battery in an emergency, a light emitting device, a battery, and a lighting device. , A cylindrical instrument body. The light source included in the light emitting device is a light emitting diode (solid-state light source). The lighting fixture described in Patent Document 1 is an emergency lighting fixture (emergency light) that performs emergency lighting.

  The lens has a bottom surface, an exit surface, and an entrance concave surface. The emission surface is a convex curved surface having an apex above the center of the bottom surface. The entrance concave surface is formed by recessing the center of the bottom surface. The entrance concave surface is a bell shape with a smooth curved surface. The diameter of the entrance concave surface is reduced toward the deeper side of the entrance concave surface, and the diameter increases toward the opening end side of the entrance concave surface. A lens is placed over the light source so that the incident concave surface faces the light emitting surface. The lens includes a first convex surface, which is raised to a depth smaller than the depth of the incident concave surface, at the bottom of the incident concave surface. The first convex surface is a convex curved surface that bulges outward.

  The light emitting device having the lens configured as described above can realize so-called bad wing type light distribution.

JP, 2016-162512, A

  According to the lens of Patent Document 1, since light can be diffused, a wide irradiation range can be acquired. On the other hand, depending on the installation location of the luminaire, it may be desired to concentrate the light on a specific range, and it may be difficult to install the luminaire with the optical axis of the lens directed to the specific range.

  An object of the present disclosure is to provide a lens, a lighting device, and a lighting fixture that can bias the distribution of light in a range between the direction of the optical axis and a desired direction intersecting the optical axis.

  A lens according to an aspect of the present disclosure includes a lens body made of a material having a light-transmitting property. The lens body has a recessed portion that is recessed inward from a reference surface that is one surface of the lens body, and an incident surface that is provided on the surface of the recessed portion and on which light emitted from a solid-state light source is incident. The lens body is provided on a surface of the lens body opposite to the reference surface, and has an emission surface from which the light incident from the incidence surface is emitted. The entrance surface includes a first entrance surface having a concave curved surface shape whose curvature increases as the distance from the reference surface increases, and a second entrance surface having a concave curved surface shape that decreases the curvature as the distance from the reference surface increases. The emission surface is formed in a convex curved surface shape whose curvature decreases as the distance from the reference surface increases. An optical axis that includes a boundary line between the first incident surface and the second incident surface and that includes an optical axis of the solid-state light source with respect to a boundary surface that intersects with the reference surface and that is parallel to the boundary surface. The surface is located on the side of the first incident surface.

  An illuminating device according to an aspect of the present disclosure includes the lens, and a solid-state light source arranged so that an optical axis is directed to the incident surface of the lens.

  A lighting fixture according to one aspect of the present disclosure includes a lighting device and a fixture body that supports the lighting device.

  The lens, the illuminating device, and the luminaire of the present disclosure have an effect that the distribution of light can be biased in a range between the direction of the optical axis and a desired direction intersecting the optical axis.

FIG. 1 is a perspective view of a lighting fixture according to an embodiment of the present disclosure. FIG. 2A is a front half cross-sectional view of the same lighting fixture. FIG. 2B is a right side view of the above lighting fixture. FIG. 2C is a bottom view of the above lighting fixture. FIG. 3 is a perspective view of a lighting device according to an embodiment of the present disclosure. FIG. 4 is an exploded perspective view of the above illumination device. FIG. 5A is a front view of a solid-state light source (LED module) included in the above illumination device. FIG. 5B is a side view of the above LED module. FIG. 6A is a bottom view of a lens according to an embodiment of the present disclosure. FIG. 6B is a top view of the same lens. FIG. 7A is a front view of the same lens. FIG. 7B is a rear view of the same lens. FIG. 8 is a left side view of the above lens. FIG. 9 is a cross-sectional view of the same lens in the front-rear direction. FIG. 10 is a cross-sectional view of the same lens in the left-right direction. FIG. 11 is a light distribution characteristic diagram of the above lens. FIG. 12: is sectional drawing of the principal part of the illuminating device same as the above. FIG. 13A is a horizontal cross-sectional view of a staircase in which the above lighting device is installed. FIG. 13B is a vertical cross-sectional view of the same staircase. FIG. 14: is sectional drawing of the lens of the modification same as the above in the front-back direction. FIG. 15 is a light distribution characteristic diagram of a lens of the above-described modified example.

  Hereinafter, the lens 3, the lighting device (emergency light source unit 14), and the lighting fixture 1 according to the embodiment will be described in detail with reference to the drawings. However, the drawings described in the embodiments below are schematic views, and the ratios of the sizes and thicknesses of the constituent elements do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be exhibited.

  The lighting fixture 1 according to the embodiment is an emergency lighting fixture that also serves as an emergency light and a stairway guide light. The luminaire 1 is directly attached to, for example, the corridor and the wall of the stairs in the common part of the housing complex. The luminaire 1 performs regular lighting with regular power supplied from a regular power source (commercial power system, etc.), charges the storage battery with the regular power, and uses emergency power supplied from the storage battery during a power failure of the regular power source. Lighting. In the following description of the lighting fixture 1, unless otherwise specified, the front-back, up-down and left-right directions indicated by arrows in FIG. 1 are defined as the front-back, up-down and left-right directions of the lighting fixture 1. For example, the front direction of the lighting fixture 1 is a direction away from the wall surface to which the lighting fixture 1 is directly attached along the vertical direction (normal direction of the wall surface).

  As shown in FIGS. 1 and 2A to 2C, the lighting fixture 1 includes a fixture body 10, a reflector 11, a cover 12, a regular light source unit 13, and an emergency light source unit 14.

  The instrument body 10 is formed in a box shape whose front surface is opened by, for example, aluminum die casting. Inside the instrument body 10, a regular light source unit 13, a regular lighting circuit, a charging circuit, a storage battery, an emergency lighting circuit, etc. are accommodated. The regular lighting circuit converts alternating current power supplied from a commercial power system into direct current power and lights the regular light source unit 13 by the converted direct current power. The regular light source unit 13 includes an illuminating white LED (Light Emitting Diode) and a diffusion plate 130 that protects the illuminating white LED and diffuses the illuminating light emitted from the illuminating white LED.

  The reflector 11 is formed in a flat plate shape with a metal material such as aluminum or aluminum alloy (see FIG. 1). The reflector 11 is attached to the instrument body 10 so as to cover the front surface of the instrument body 10. A circular hole 110 is opened at the center of the reflector 11 (see FIGS. 1 and 2A). When the reflector 11 is attached to the instrument body 10, the diffusion plate 130 of the regular light source unit 13 is exposed through the hole 110 of the reflector 11. The front surface of the reflector 11 is mirror-finished, and the light emitted from the regular light source unit 13 is reflected by the front surface of the reflector 11.

  The cover 12 is made of a synthetic resin having a light-transmitting property, such as an acrylic resin, and has a rectangular gutter shape. The cover 12 has a quadrangular front plate 120, a rectangular left side plate 121, and a rectangular right side plate 122. The left side plate 121 projects rearward from the left end of the front plate 120. The right side plate 122 projects rearward from the right end of the front plate 120. The front plate 120, the left side plate 121, and the right side plate 122 are integrally formed as a molded body of synthetic resin. At the rear ends of the left side plate 121 and the right side plate 122, L-shaped insertion pieces 123 are integrally formed so as to protrude rearward (see FIG. 1). Each of the insertion pieces 123 is inserted from above the instrument body 10 into the insertion grooves 100 respectively provided at the left and right ends of the front end portion of the instrument body 10 (see FIG. 1). That is, the cover 12 is removably attached to the instrument body 10 by inserting the pair of insert pieces 123 into the pair of insert grooves 100 of the instrument body 10, respectively.

  The emergency light source unit 14 is the lighting device according to the embodiment. The emergency light source unit 14 includes the LED module 2 which is a solid light source, the lens 3 according to the embodiment, the heat dissipation plate 15, the LED holder 16, the lens holder 17, and the two mounting screws 18 (FIG. 3 to FIG. 10). The emergency light source unit 14 is housed in the instrument body 10 with a part of the lens 3 protruding out of the instrument body 10 through a circular window 101 provided in the bottom surface of the instrument body 10 (FIG. 2A to 2C).

  The LED module 2 has a package 20 made of synthetic resin, as shown in FIGS. 5A and 5B. A cylindrical rib 200 projects from the surface of the package 20. A substrate on which a plurality of LED chips are mounted is housed in the package 20. The plurality of LED chips are sealed with a transparent synthetic resin such as silicone resin. The light emitted from the plurality of LED chips is emitted to the outside of the package 20 from the light emitting region 21 formed inside the rib 200 of the package 20. The optical axis A1 of the LED module 2 is a virtual straight line that passes through the center O1 of the circular light emitting region 21 and is parallel to the normal direction of the light emitting region 21 (see FIGS. 9 and 10). An anode electrode 22 and a cathode electrode 23 are provided on the surface of the package 20 at opposite ends on a diagonal line across the rib 200. Electric wires for power supply are soldered to the anode electrode 22 and the cathode electrode 23 one by one.

  As shown in FIGS. 6 to 8, the lens 3 includes a lens body 30 and a flange 35 made of a translucent material such as glass (eg, quartz glass). The flange 35 is formed in an annular shape. The flange 35 projects outward from one end (upper end) of the side surface of the lens body 30.

  The lens body 30 includes a recess 31 that is recessed inward from a reference surface S1 (see FIG. 6B), which is one surface (upper surface) of the lens body 30, an entrance surface 32 provided on the surface of the recess 31, and the lens body 30. Among them, it has an emission surface 33 provided on the surface (lower surface) opposite to the reference surface S1. Further, the reference surface S1 of the lens body 30 is provided with a recess 34 that is recessed inward (downward) so as to surround the periphery of the recess 31 (see FIGS. 9 to 10). The recess 34 is provided in the lens body 30 as a space for escaping an electric wire electrically connected to the anode electrode 22 and the cathode electrode 23 of the LED module 2. However, the lens body 30 may not be provided with the recess 34.

  Further, on the reference surface S1 of the lens body 30, three positioning recesses 36 are provided around the recess 34. Each of these three positioning recesses 36 is a hemispherical recess connected to the recess 34 (see FIGS. 7A and 7B). The three positioning recesses 36 are arranged at equal intervals along the circumferential direction of the recess 34 on the reference surface S1 (see FIGS. 6A and 6B).

  The incident surface 32 has a concave curved first incident surface 321 and a concave curved second incident surface 322 (see FIGS. 6B and 9). The first incident surface 321 is located in front of the surface of the recess 31, and the second incident surface 322 is located behind in the surface of the recess 31 (see FIG. 9). The curvature of the first incident surface 321 (the reciprocal of the radius of curvature) increases as the distance from the reference surface S1 increases. On the other hand, the curvature of the second incident surface 322 decreases with increasing distance from the reference surface S1. The maximum value of the curvature of the first incident surface 321 is larger than the maximum value of the curvature of the second incident surface 322.

  The emission surface 33 is formed in a convex curved surface shape protruding to the opposite side (lower side) from the reference surface S1 (see FIG. 8). The curvature of the emission surface 33 increases from the apex T1 of the emission surface 33 toward the reference surface S1. The apex of the emission surface 33 is assigned the symbol "T1" (see FIG. 9).

  Here, an imaginary plane including the boundary line between the first incident surface 321 and the second incident surface 322 and intersecting with the reference surface S1 (orthogonal in the embodiment) is defined as the boundary surface SS1. A virtual plane including the optical axis A1 of the LED module 2 and parallel to the boundary surface SS1 is defined as an optical axis surface S2 (see FIG. 9). The optical axis surface S2 is located on the first incident surface 321 side with respect to the boundary surface SS1. In other words, the optical axis surface S2 is displaced forward (rightward in FIG. 9) from the boundary surface SS1. When the longest linear distance from the boundary surface SS1 to the second incident surface 322 on the reference surface S1 is X2 and the longest linear distance from the optical axis surface S2 to the second incident surface 322 is X1, X2 is given. Is preferably shorter than X1 (X2 <X1). Further, when the shortest distance between the boundary surface SS1 and the optical axis surface S2 is D1 and the distance from the optical axis A1 of the LED module 2 (center O1 of the light emitting area 21) to the end of the light emitting area 21 is L1, D1 is It is preferably shorter than half of L1 (see FIGS. 5A and 9).

  The light distribution characteristics of the lens 3 are shown in FIG. A solid line α1 in FIG. 11 indicates the light distribution characteristic in the front-rear direction, that is, the light distribution characteristic on an imaginary plane that includes the optical axis A1 and intersects the boundary surface SS1 at right angles. However, the origin in FIG. 11 is the center O1 of the light emitting region 21. Further, the value of the radius vector in FIG. 11 is normalized by the peak value of the light amount of the light distribution characteristic indicated by the solid line α1. With respect to the solid line α1, the angle vertically below that overlaps the optical axis A1 of the LED module 2 is 0 °, the angle in the forward direction is given a minus sign, and the angle in the backward direction is given a plus sign.

  On the other hand, the broken line α2 in FIG. 11 indicates the light distribution characteristic in the left-right direction, that is, the light distribution characteristic on the boundary surface SS1. However, with respect to the broken line α2, the vertical downward angle overlapping the optical axis A1 of the LED module 2 is 0 °, the leftward angle is given a minus sign, and the rightward angle is given a plus sign. ing.

  As is clear from the broken line α2 in FIG. 11, the lens 3 distributes light substantially evenly in the left-right direction in the range of −60 ° to 60 °. On the other hand, as is clear from the solid line α1 in FIG. 11, the lens 3 distributes light so that the light amount in a predetermined forward range (for example, a range of −30 ° to −70 °) is relatively increased. There is. That is, the lens 3 shifts the optical axis surface S2 forward from the boundary surface SS1 so that the distribution of light (light distribution characteristics) and the desired direction (vertical direction) intersecting the optical axis A1 (the vertical direction). It can be biased to a range between the front direction and the vertical direction (a range of about 30 ° to 70 ° from the vertical direction).

  The heat dissipation plate 15 is formed in a polygonal shape (for example, an octagonal shape) from a plate material made of aluminum or an aluminum alloy, for example (see FIG. 4).

  The LED holder 16 has a disc-shaped holder body 160 and a pair of fixing portions 161 for fixing the holder body 160 to the lens holder 17 (see FIGS. 3 and 4). The holder body 160 and the pair of fixing portions 161 are integrally formed as a synthetic resin molded body. A mounting hole 162 is opened at the center of the holder body 160 (see FIG. 4). The LED module 2 is fitted into the mounting hole 162 of the holder body 160. The LED module 2 is held in the LED holder 16 (holder body 160) by being fitted into the mounting hole 162. Further, three protrusions 164 are provided around the mounting hole 162 on the surface of the holder body 160 (see FIG. 4). Each protrusion 164 is formed in a hemispherical shape.

  Each of the pair of fixing portions 161 projects one by one on the side surface of the holder main body 160 from positions facing each other with the mounting hole 162 interposed therebetween (see FIG. 4). The tip portion of each fixing portion 161 is bent in an L shape. Further, a claw 163 is formed at the tip of each fixing portion 161 (see FIGS. 3 and 4).

  The lens holder 17 has an annular frame 170 (see FIGS. 3 and 4). A circular window 171 opens in the center of the frame 170. The diameter of the window 171 is larger than the diameter of the lens body 30 and smaller than the diameter of the flange 35. Further, in the frame body 170, screw insertion holes 172 penetrate one by one at positions facing each other across the window 171 (see FIG. 4). Further, on the side surface of the frame body 170, hooking portions 173 on which the claws 163 of the fixing portion 161 are hooked are provided one by one at positions facing each other across the window 171 (see FIG. 4).

  The LED holder 16 holding the LED module 2 is coupled to the lens holder 17 by hooking the claws 163 of the pair of fixing portions 161 one by one on the pair of hooking portions 173 of the frame 170 (see FIG. 3). The lens 3 is sandwiched between the LED holder 16 and the lens holder 17 such that the lens body 30 is inserted into the window 171 of the frame body 170. The lens 3 is held by the lens holder 17 by covering the peripheral edge portion of the window 171 in the frame 170 with the flange 35 of the lens 3 (see FIGS. 3 and 12). Further, in the lens 3, the corresponding protrusion 164 of the three protrusions 164 of the LED holder 16 is fitted into each of the three positioning recesses 36 of the lens body 30 (FIGS. 3 and 12). reference). That is, the lens 3 is positioned in the holder body 160 of the LED holder 16 by the three positioning recesses 36 and the three protrusions 164. Further, the lens 3 is positioned with respect to the LED module 2 via the LED holder 16 (see FIG. 3). The lens holder 17 is screwed to the heat dissipation plate 15 by a mounting screw 18 that is inserted into each of the pair of screw insertion holes 172 (see FIG. 3).

  The luminaire 1 is installed on the wall 81 of the landing 80 of the staircase 8 as a stairway guide light, as shown in FIGS. 13A and 13B, for example. The width W1 of the stairs 82 of the staircase 8 is about 1.8 m. The depth F1 of the landing 80 is about 1.8 m. The mounting height H1 of the lighting fixture 1 is about 2 m.

  Since the emergency light source unit 14 (illuminating device) of the luminaire 1 has the light distribution characteristic shown by the broken line α2 in FIG. 11, as shown in FIG. 13A, the right and left stairs 82 and the landing 80 are provided with a sufficient amount of light. Can be irradiated. In addition, since the emergency light source unit 14 of the lighting fixture 1 has the light distribution characteristic shown by the solid line α1 in FIG. 11, as shown in FIG. 13B, the stairs in the down direction (the stairs on the right side) and the landing 80 on the lower floor are shown. It is possible to irradiate a necessary and sufficient amount of light. In addition, in the emergency light source unit 14, the "necessary and sufficient amount of light" means the required illuminance of emergency lighting (for example, in the case of an emergency light) and the Building Standards Act (in the case of a stairway guidance light) , 2 lux or 1 lux) is necessary and sufficient.

  Further, in the lens 3, the apex T1 of the exit surface 33 is located between the optical axis surface S2 and the boundary surface SS1. Accordingly, the lens 3 can distribute the necessary and sufficient amount of light in the direction of the optical axis A1 (vertical direction) while biasing the light distribution characteristics in the range of approximately 30 ° to 70 ° from the vertical direction. it can.

  Further, in the lens 3, the maximum value of the curvature of the first incident surface 321 (about 0.25) is larger than the maximum value of the curvature of the second incident surface 322 (about 0.15). The curvature of each of the first incident surface 321 and the second incident surface 322 is maximized in the curvature near the boundary surface SS1 in the direction orthogonal to the boundary surface SS1. Thereby, the lens 3 can further deflect the light incident on the first incident surface 321.

  Further, in the lens 3, the longest linear distance X2 from the boundary surface SS1 on the reference surface S1 to the second incident surface 322 is the longest linear distance X2 from the optical axis surface S2 on the reference surface S1 to the second incident surface 322. It is shorter than X1 (see FIG. 9). Thereby, the lens 3 can further deflect the light incident on the first incident surface 321.

  Further, in the lens 3, the shortest distance D1 between the boundary surface SS1 and the optical axis surface S2 is half the distance L1 from the optical axis A1 of the LED module 2 (center O1 of the light emitting area 21) to the end of the light emitting area 21. Shorter than 1. Accordingly, the lens 3 can distribute the necessary and sufficient amount of light in the direction of the optical axis A1 (vertical direction) while biasing the light distribution characteristics in the range of approximately 30 ° to 70 ° from the vertical direction. it can.

  Here, a modified example of the lens 3 according to the embodiment will be described. As shown in FIG. 14, the lens 3 of the modified example is different from the lens 3 according to the embodiment only in that the reference surface S1 of the lens body 30 is not provided with the recess 34. In addition, in the lens 3 according to the embodiment, the recess 34 is provided in the lens body 30 as a space for allowing an electric wire electrically connected to the anode electrode 22 and the cathode electrode 23 of the LED module 2 to escape.

  FIG. 15 shows the light distribution characteristics of the lens 3 of the modified example. A solid line β1 in FIG. 15 indicates the light distribution characteristic in the front-rear direction. However, the value of the radius vector in FIG. 15 is normalized by the peak value of the light amount of the light distribution characteristic indicated by the solid line β1. Further, with respect to the solid line β1, the angle vertically below that overlaps the optical axis A1 of the LED module 2 is 0 °, the angle in the forward direction is given a minus sign, and the angle in the backward direction is given a plus sign. There is.

  On the other hand, the broken line β2 in FIG. 15 indicates the light distribution characteristic in the left-right direction. However, with respect to the broken line β2, the vertical downward angle overlapping with the optical axis A1 of the LED module 2 is 0 °, the leftward angle is given a minus sign, and the rightward angle is given a plus sign. ing.

  Similar to the lens 3 according to the embodiment, the lens 3 of the modified example biases the light distribution characteristics in a range between the direction of the optical axis A1 and the front-rear direction (a range of approximately 30 ° to 70 ° from the vertical direction). be able to. However, in the light distribution characteristic indicated by the solid line β1 in FIG. 15, the light amount near −40 ° is reduced by about 30% with respect to the light distribution characteristic indicated by the solid line α1 in FIG. That is, the lens 3 of the modified example can reduce the peak of the light amount in the vicinity of −40 ° in the front direction because the recess 34 is not provided. As is apparent from the broken line β2 in FIG. 15, the lens 3 of the modified example distributes light substantially evenly in the left-right direction in the range of −60 ° to 60 °, like the lens 3 according to the embodiment. are doing.

  As described above, the lens (3) according to the first aspect includes the lens body (30) made of a translucent material. The lens body (30) is provided on the surface of the recess (31) and the recess (31) recessed inward from the reference surface (S1) which is one surface of the lens body (30), and the solid light source (LED module 2). An incident surface (32) on which the light emitted from is incident. The lens body (30) is provided on the surface of the lens body (30) opposite to the reference surface (S1) and has an emission surface (33) through which the light incident from the incidence surface (32) is emitted. The incident surface (32) has a concave curved surface-shaped first incident surface (321) whose curvature increases as the distance from the reference surface (S1) increases, and a concave curved surface-shaped second surface that decreases as the distance from the reference surface (S1) decreases. An entrance surface (322). The emission surface (33) is formed in a convex curved surface shape whose curvature decreases as the distance from the reference surface (S1) increases. An optical axis (A1) of the solid-state light source is included with respect to a boundary surface (SS1) that includes a boundary line between the first incident surface (321) and the second incident surface (322) and intersects with the reference surface (S1). The optical axis surface (S2) parallel to the boundary surface (SS1) is located on the first incident surface (321) side.

  The lens (3) according to the first aspect shifts the optical axis surface (S2) from the boundary surface (SS1) to the first incident surface (321) side, so that the light distribution (light distribution characteristic) is changed to the optical axis ( It can be biased in the range between the direction A1) and the desired direction intersecting the optical axis (A1).

  The lens (3) according to the second aspect can be realized by a combination with the first aspect. In the lens (3) according to the second aspect, the vertex (T1) of the exit surface (33) is preferably located between the optical axis surface (S2) and the boundary surface (SS1).

  The lens (3) according to the second aspect can distribute the necessary and sufficient amount of light in the direction of the optical axis (A1) (vertical direction) while biasing the light distribution from the vertical direction.

  The lens (3) according to the third aspect can be realized by a combination with the first or second aspect. In the lens (3) according to the third aspect, it is preferable that the maximum value of the curvature of the first incident surface (321) is larger than the maximum value of the curvature of the second incident surface (322).

  The lens (3) according to the third aspect can further deflect the light incident on the first incident surface (321).

  The lens (3) according to the fourth aspect can be realized by a combination with any one of the first to third aspects. In the lens (3) according to the fourth aspect, it is preferable that the curvature of the exit surface (33) increases from the vertex (T1) toward the reference surface (S1).

  The lens (3) according to the fourth aspect can further deflect the light emitted from the emission surface (33).

  The lens (3) according to the fifth aspect can be realized by a combination with any one of the first to fourth aspects. In the lens (3) according to the fifth aspect, the longest linear distance (X2) from the boundary surface (SS1) on the reference surface (S1) to the second incident surface (322) is on the reference surface (S1). It is preferably shorter than the longest linear distance (X1) from the optical axis surface (S2) to the second incident surface (322).

  The lens (3) according to the fifth aspect can further deflect the light incident on the first incident surface (321).

  The lens (3) according to the sixth aspect can be realized in combination with the fifth aspect. In the lens (3) according to the sixth aspect, the shortest distance (D1) between the boundary surface (SS1) and the optical axis surface (S2) is from the optical axis (A1) to the end of the light emitting region (21) of the solid-state light source. It is preferable that the distance is shorter than half of the distance (L1).

  The lens (3) according to the sixth aspect can distribute a necessary and sufficient amount of light in the direction of the optical axis (A1) while biasing the light distribution in a predetermined range.

  The lens (3) according to the seventh aspect can be realized by a combination with any one of the first to sixth aspects. In the lens (3) according to the seventh aspect, the reference surface (S1) of the lens body (30) is provided with an inwardly recessed recess (34) surrounding the periphery of the recess (31). It is preferable.

  The lens (3) according to the seventh aspect allows the electric wire for supplying power to the solid-state light source to escape through the recess (34).

  The lens (3) according to the eighth aspect can be realized by a combination with any one of the first to seventh aspects. In the lens (3) according to the eighth aspect, it is preferable that one or more positioning portions (positioning recesses 36) are provided on the reference surface (S1) of the lens body (30). The positioning part is preferably positioned with respect to the mounting surface of the member (LED holder 16) to which the lens body (30) is mounted.

  The lens (3) according to the eighth aspect can be easily positioned with respect to the member (LED holder 16).

  The illumination device (emergency light source unit 14) according to the ninth aspect is the lens (3) according to any one of the first to eighth aspects, and the optical axis (A1) on the incident surface (32) of the lens (3). The solid-state light source (LED module 2) is arranged so as to face.

  The illumination device according to the ninth aspect can bias the light distribution (light distribution characteristic) in a range between the direction of the optical axis (A1) and a desired direction intersecting the optical axis (A1).

  A lighting fixture (1) according to a tenth aspect includes the lighting device according to the ninth aspect, and a fixture body (10) that supports the lighting device.

  In the luminaire (1) according to the tenth aspect, the light distribution (light distribution characteristic) is biased to a range between the direction of the optical axis (A1) and a desired direction intersecting the optical axis (A1). You can

1 Lighting fixture 2 LED module (solid light source)
3 Lens 10 Instrument main body 16 LED holder (member)
21 Light-Emitting Area 30 Lens Body 31 Recessed Area 32 Incident Surface 33 Outgoing Surface 34 Recessed Area 36 Positioning Recessed Area (Positioning Area)
321 1st entrance surface 322 2nd entrance surface A1 Optical axis S1 Reference surface S2 Optical axis surface SS1 Boundary surface T1 Apex of the exit surface X1 Longest linear distance from the optical axis surface on the reference surface to the 2nd entrance surface X2 Reference surface The longest linear distance from the upper boundary surface to the second incident surface D1 The shortest distance between the boundary surface and the optical axis surface L1 The distance from the optical axis to the edge of the light emitting region

Claims (10)

A lens body made of a material having a light-transmitting property,
The lens body is
A concave portion inwardly recessed from a reference surface that is one surface of the lens body,
An incident surface provided on the surface of the recess, on which light emitted from a solid-state light source is incident,
The lens body is provided on a surface opposite to the reference surface, and has an emission surface through which the light incident from the incident surface is emitted,
The incident surface is
A first incident surface having a concave curved surface shape whose curvature increases as the distance from the reference surface increases,
A second incident surface having a concave curved surface shape whose curvature decreases with increasing distance from the reference surface,
The emission surface is formed in a convex curved surface shape whose curvature decreases as the distance from the reference surface increases,
An optical axis that includes a boundary line between the first incident surface and the second incident surface and that includes an optical axis of the solid-state light source with respect to a boundary surface that intersects with the reference surface and that is parallel to the boundary surface. A surface is located on the side of the first incident surface,
lens. The apex of the exit surface is located between the optical axis surface and the boundary surface,
The lens according to claim 1. The maximum value of the curvature of the first incident surface is larger than the maximum value of the curvature of the second incident surface,
The lens according to claim 1 or 2. The curvature of the exit surface increases from the apex toward the reference surface,
The lens according to claim 1. A longest linear distance from the boundary surface on the reference surface to the second incident surface is shorter than a longest linear distance from the optical axis surface on the reference surface to the second incident surface,
The lens according to any one of claims 1 to 4. The shortest distance between the boundary surface and the optical axis surface is shorter than one half of the shortest distance from the optical axis to the end of the light emitting region of the solid-state light source,
The lens according to claim 5. The reference surface of the lens body is provided with an inwardly recessed recess that surrounds the periphery of the recess.
The lens according to claim 1. One or more positioning portions are provided on the reference surface of the lens body,
The positioning portion is positioned with respect to a mounting surface of a member to which the lens body is mounted,
The lens according to claim 1. The lens according to claim 1,
A solid-state light source arranged so that an optical axis is directed to the incident surface of the lens,
Lighting equipment. A lighting device according to claim 9;
A fixture body that supports the lighting device,
lighting equipment.

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