JP7258512B2 - Light distribution control lens and lighting equipment - Google Patents

Description

The present invention relates to a light distribution control lens for controlling light distribution of light emitted from a light source and a lighting fixture provided with this light distribution control lens.

A light distribution control lens controls the light distribution of light emitted by a light source, and is conventionally used in lighting fixtures and the like together with the light source (see, for example, Patent Document 1). Japanese Patent Laid-Open No. 2002-200002 discloses an embedded lighting fixture that is installed by inserting a main body portion into an embedding hole formed in an attached portion such as a ceiling. In the lighting fixture of Patent Document 1, the entrance surface of the lens is formed in a substantially mortar-shaped concave shape toward the exit surface side, and the exit surface of the lens is formed in an outwardly convex shape. . The exit surface of the lens is formed by a first exit surface, a second exit surface, and a third exit surface from the center to the side surface. The inclination of the surface is greater than the inclination of the second exit surface. In Patent Document 1, the first exit surface, the second exit surface, and the third exit surface are formed so that the peaks of the emitted light are at different angles. The luminous intensity peak is shown to be located at an angle of about 58°.

By the way, the light distribution control lens may be used for an emergency light. Standards for emergency lighting fixtures are based on the Japan Lighting Manufacturers Association's "Technical Standards for Emergency Lighting Fixtures (JIL5501-2009)" Appendix 8 "Emergency lighting fixtures using LED light sources that comply with Ministry of Construction Notification No. 1830. stipulated in the Technical Standards for Lighting Equipment. When an emergency light is arranged side by side with a normal light source in a lighting fixture, a partition is provided between the emergency light and the normal light source in compliance with the technical standards for emergency lighting fixtures.

JP 2016-157656 A

In general, when a plurality of lighting fixtures are installed in a space of a certain size, a lens is desired in which the peak of the light distribution angle of emitted light is positioned on the wide-angle side in order to reduce the number of installed lighting fixtures. In the lighting fixture of Patent Document 1, the peak of the luminous intensity of emitted light is at an angle of about 58°, and a lens is desired in which the peak is on the wide-angle side. Moreover, when the lighting fixture of Patent Document 1 is used as an emergency light that is installed together with a regular light source, a partition wall is installed outside the lens. If a sufficient distance cannot be secured from the center of the lens to the partition wall, the percentage of light emitted from the lens that is blocked by the partition wall increases, and the intended amount of light may not be obtained.

The present invention has been made to solve the above-mentioned problems, and suppresses the decrease in light intensity even when there is an obstacle such as a partition on the outside of the lens, while increasing the peak of the luminous intensity of the emitted light more than before. It is an object of the present invention to provide a light distribution control lens and a lighting fixture that can be set to the wide-angle side.

A light distribution control lens according to the present invention has an incident surface on which light enters and an exit surface from which light exits. and a sub-recess that is a ring-shaped groove recessed from the bottom surface toward the exit surface so as to surround the main recess, and the exit surface is above the main recess. a first output inclined surface provided in a wider range than the main concave portion and inclined from a plane perpendicular to the central axis so as to be closer to the bottom surface as the distance from the central axis of the light distribution control lens increases; a second outgoing inclined surface that is provided so as to surround the inclined surface and is steeper than the first outgoing inclined surface; The bottom surface is the incident surface, and the inner surface of the sub-recess on the central axis side extends in the central axis direction in a cross section of the light distribution control lens along the central axis. light incident through the main concave portion is totally reflected, and the first output inclined surface converts the light incident through the main concave portion to an angle from the central axis before the light reaches the first output inclined surface. also refracts the light so that the angle from the central axis becomes large after being refracted by the first inclined surface for emission, and the second inclined surface for emission refracts the light incident through the main concave portion to the light is refracted so that the angle from the central axis after the light is refracted at the second outgoing inclined surface is smaller than the angle from the central axis before reaching the second outgoing inclined surface.

Further, in the lighting fixture according to the present invention, the light distribution control lens, a light source arranged at a position on the opposite side of the bottom surface of the light distribution control lens from the direction in which the main recess is recessed, and emitting light; a wall portion arranged outside an outer periphery of the light distribution control lens and extending along the central axis of the light distribution control lens.

According to the light distribution control lens and lighting fixture of the present invention, light is deflected to the wide-angle side by the first inclined surface of emission, and the second inclined surface of emission, which is steeper than the first inclined surface of emission, directs light from below the emission surface. Light can be deflected to the front side. In addition, the inner surface of the sub-recess provided outside the main recess reflects light emitted from the light source at a wide angle and entering the lens from the bottom surface, changing the direction of travel of the light, thereby changing the direction of travel of the light to the first exit surface above the exit surface. Light can be emitted from the inclined surface. As a result, even if there is an obstacle such as a wall on the outside of the lens, the peak of the luminous intensity of the emitted light can be made wider than before while suppressing the decrease in the amount of light.

FIG. 4 is an explanatory diagram illustrating the trajectory of light emitted from the center of the light source of the lighting fixture according to Embodiment 1 of the present invention; 1 is a plan view of a light source and a light source module substrate of a lighting fixture according to Embodiment 1 of the present invention; FIG. FIG. 4 is an explanatory diagram illustrating the trajectory of light emitted from the left end of the light source of the lighting fixture according to Embodiment 1 of the present invention; FIG. 4 is an explanatory diagram illustrating the trajectory of light emitted from the right end portion of the light source of the lighting fixture according to Embodiment 1 of the present invention; It is a figure which shows the light distribution of the lighting fixture which concerns on Embodiment 1 of this invention. FIG. 4 is a cross-sectional view showing a modification of the lighting fixture according to Embodiment 1 of the present invention; FIG. 10 is an explanatory diagram illustrating the trajectory of light emitted from the right end portion of the light source of the lighting fixture according to Embodiment 2 of the present invention; FIG. 7 is a diagram showing a light distribution of the lighting fixture according to Embodiment 2 of the present invention; FIG. 10 is a cross-sectional view of a lighting fixture according to Embodiment 3 of the present invention; FIG. 11 is an exploded perspective view showing a modification of the lighting fixture according to Embodiment 3 of the present invention; FIG. 11 is an external perspective view showing a modification of the lighting fixture according to Embodiment 3 of the present invention;

Embodiment 1.
FIG. 1 is an explanatory diagram illustrating the trajectory of light emitted from the center of the light source of the lighting fixture according to Embodiment 1 of the present invention. FIG. 1 shows a cross section of the optical system portion of the lighting fixture along the central axis CA of the lens 3. As shown in FIG. In the drawing, the arrow X direction represents the width direction of the lens 3 and the arrow Z direction represents the height direction of the lens 3 . An optical system 100 of the lighting fixture is composed of a light source 1, a light source module substrate 2, a lens 3, and a socket 4, and is housed in a housing portion 5 of the lighting fixture. In the example shown in FIG. 1, the light source 1 has an optical axis substantially perpendicular to the light emitting surface, and the optical axis passes through the center P0 of the light emitting surface. In the figure, the light source 1 is arranged so that the optical axis is along the central axis CA of the lens 3, and the traveling direction of the light along the optical axis is indicated by an arrow Z1. Hereinafter, the lens 3 may be referred to as a light distribution control lens.

The light source 1 is, for example, an LED package in which a plurality of surface-mounted LEDs are arranged or a surface light source such as a COB (Chip On Board) is mounted on a circuit board. As the light source 1, one or a plurality of LED packages called CSP (Chip Scale Package) may be used. The light source module board 2 is a printed board on which a circuit for lighting the light source 1 is mounted, and is made of, for example, aluminum in consideration of heat dissipation.

FIG. 2 is a plan view of the light source and the light source module substrate of the lighting fixture according to Embodiment 1 of the present invention. In the drawing, the contour of the lens 3 is indicated by a dashed line, and the arrow Y direction represents the depth direction of the lens 3. As shown in FIG. In the example shown in FIG. 2, the light source 1 has a square-shaped light-emitting surface configured by arranging four square-shaped CSPs in two rows vertically and horizontally as the light-emitting portion 1a. Thus, when the light source 1 is composed of an array of a plurality of light emitting portions 1a, the light source 1 has dark portions 1b that do not emit light between the light emitting portions 1a. The light source 1 is attached to the upper surface of the light source module substrate 2 and arranged below the lens 3 . The shape, number, and arrangement of the light-emitting portions 1a are not particularly limited to this, and may be appropriately selected according to the brightness, color, etc., required for the lighting fixture.

The lens 3 is made of transparent glass or the like, and is formed, for example, in a rotationally symmetrical shape about the central axis CA. The lens 3 has an incident surface 20 into which light enters and an exit surface 10 from which light exits, and controls the light distribution of the light emitted by the light source 1 . The incident surface 20 of the lens 3 is provided so as to face the light source 1 on the side of the bottom surface 30 in the height direction (direction of arrow Z).

The socket 4 is arranged between the lens 3 and the light source 1 and fixes the light source module substrate 2 and the lens 3 . Specifically, the socket 4 is arranged such that the distance between the upper surface of the light source module substrate 2 and the bottom surface 30 of the lens 3 is kept constant, and the central axis CA of the lens 3 and the optical axis of the light source 1 are aligned. 1 is attached to the light source module substrate 2 and the lens 3 are fixed.

The socket 4 is made of a highly reflective material and has a light entrance hole 4 a corresponding to the entrance surface 20 . The light entrance hole 4a has the same shape as the projection surface of the incident surface 20 toward the bottom surface 30 side. The opening width W1 of the light entrance hole 4a on the lens side is the same as the width of the incident surface 20 in the width direction of the lens 3 (the arrow X direction). As a result, the socket 4 allows the light from the light source 1 to pass through the entrance surface 20 of the lens 3 through the light entrance hole 4a, and the portion outside the light entrance hole 4a passes through the surface other than the entrance surface 20 of the lens 3. Blocks the light from the light source 1 from entering. Hereinafter, the socket 4 may be referred to as a light entrance control member.

The housing portion 5 covers the bottom surface 30 of the light source module substrate 2 to which the light source 1 is attached and the lens 3 fixed by the socket 4 and the side surface extending along the central axis CA. The upper surface of the housing portion 5 is open, and the light emitted from the lens 3 is irradiated from the opening of the housing portion 5 . The wall portion 5a provided outside the side surface of the lens 3 in the housing portion 5 functions as a partition wall from the normal light source when the optical system 100 of Embodiment 1 is used as an emergency light together with the normal light source. do. The wall portion 5a has a height approximately equal to the height H1 of the lens 3, and is formed, for example, in a cylindrical shape so as to surround the outer circumference of the lens 3. As shown in FIG. The wall portion 5a does not need to surround the entire periphery of the lens 3, and may be provided only between the common light source outside the lens 3 and the wall portion 5a. According to legal regulations, it is sufficient if a partition is provided only between the normal light sources. If the optical system 100 of Embodiment 1 is configured so that a desired light distribution can be obtained even when the wall portion 5a has a rotationally symmetrical shape, the optical system 100 can be applied to an embedded lighting fixture, and the lens 3 can be installed on the ceiling. Even if the structure is such that it does not protrude from the surface, it is possible to prevent light from being blocked by surrounding walls.

The shape and function of the lens 3 will be described in detail with reference to FIG. The lens 3 has a main concave portion 40 formed so as to be concave from the bottom surface 30 toward the emission surface 10 side, and a sub concave portion 50 which is a ring-shaped groove concave from the bottom surface 30 toward the emission surface 10 side so as to surround the main concave portion 40 . and have Here, the main concave portion 40 and the bottom surface portion 31 between the main concave portion 40 and the sub concave portion 50 in the bottom surface 30 are the incident surface 20 of the lens 3 .

The main concave portion 40 includes a convex portion 41 provided in the central portion of the main concave portion 40 including the central axis CA, a first incident inclined surface 42 provided outside the convex portion 41, a second incident inclined surface 43, and a third inclined surface 44 of incidence. The convex portion 41 is formed so as to swell toward the bottom surface 30 side, that is, downward. The incident first inclined surface 42 is provided so as to surround the outer circumference of the convex portion 41, and is formed to be inclined from a plane perpendicular to the central axis CA so as to approach the bottom surface 30 as the distance from the central axis CA increases. The second incident inclined surface 43 is provided so as to surround the first incident inclined surface 42 and is a steeper inclined surface than the first incident inclined surface 42 . The third incident inclined surface 44 is provided so as to surround the second incident inclined surface 43 and is a gentler inclined surface than the second incident inclined surface 43 . The incident third inclined surface 44 connects the lower edge of the incident second inclined surface 43 and the edge of the bottom surface portion 31 on the central axis CA side.

The convex portion 41 includes a flat surface 41a provided in the central portion including the central axis CA, and a convex outer peripheral surface 41b provided on the outer peripheral portion of the flat surface 41a and connecting the flat surface 41a and the incident first inclined surface 42. and The convex outer peripheral surface 41b is a steeply inclined surface inclined from a plane perpendicular to the central axis CA so as to become closer to the exit surface 10 as the distance from the central axis CA of the lens 3 increases. The lower edge of the convex outer peripheral surface 41b and the flat surface 41a, and the upper edge of the convex outer peripheral surface 41b and the incident first inclined surface 42 are smoothly connected.

In this manner, the surface of the incident surface 20 outside the convex portion 41 is composed of a plurality of surfaces having different inclinations. Therefore, compared to the conventional case where the incident surface is formed in a substantially mortar shape, the lens 3 controls the light incident on the incident surface 20 in a certain range to the predetermined position range of the exit surface 10. It is easy to remove, the spread of light passing through each surface is suppressed, and the light can be deflected to a desired angle.

In the first embodiment, the sub-recess 50 has an inner side surface 51 on the central axis CA side and a surface 52 farther from the central axis CA than the inner side surface 51, and has a substantially triangular cross section as shown in FIG. have. The inner surface 51 of the sub-recess 50 on the central axis CA side extends in the central axis direction (arrow Z direction) in the cross section of the lens 3 along the central axis CA, and the light incident on the lens 3 via the bottom surface portion 31 is totally reflected. The inner side surface 51 does not have to be strictly parallel to the central axis CA, and the light that enters the lens 3 from the light source 1 via the bottom surface portion 31 is totally reflected by the inner side surface 51 and is aligned with the central axis CA. You may incline with respect to. Further, the inner side surface 51 totally reflects the light incident on the lens 3 via the third incident surface 44 .

The exit surface 10 of the lens 3 has two inclined surfaces, a first inclined exit surface 11 and a second inclined exit surface 12 having different inclinations. The first inclined surface 11 and the second inclined surface 12 may be planes with different inclinations or curved surfaces with different curvatures. The output first inclined surface 11 is provided including the central axis CA of the lens 3, and the output surface 10 is a curved surface in which a plurality of inclined surfaces are connected and whose vertex is the point at which they intersect the central axis CA. The output first inclined surface 11 is provided above the main concave portion 40 in a wider range than the main concave portion 40 in a plan view, and is a plane perpendicular to the central axis CA so as to become closer to the bottom surface 30 as the distance from the central axis CA of the lens 3 increases. is sloping from The first output inclined surface 11 outputs at least part of the light that has entered through the first incident inclined surface 42 . The inclination of the first output inclined surface 11 from the plane perpendicular to the central axis CA is gentler than the inclination of the first incident inclined surface 42 . With such a configuration, the first emission inclined surface 11 refracts and emits the light incident through the first incident inclined surface 42 away from the central axis CA (see the light in the region B0).

The second output inclined surface 12 is provided so as to surround the first output inclined surface 11 , and has a greater inclination from the plane perpendicular to the central axis CA than the first output inclined surface 11 . The second output inclined surface 12 is smoothly connected to the outer peripheral edge of the first output inclined surface 11 . The first outgoing inclined surface 11 and the second outgoing inclined surface 12 refract and emit the light that has entered through the second incoming inclined surface 43 (see the light in the region C01 and the light in the region C02).

FIG. 1 shows a section of the optical system portion passing through the center P0 of the light source 1 and along the central axis CA of the lens 3, that is, the optical axis of the light source 1. As shown in FIG. In FIG. 1, a plurality of arrows indicate how the light emitted from the center P0 of the light source 1 is deflected by the lens 3. As shown in FIG. The light from the light source 1 travels so as to diffuse from the light emitting surface. The light source 1 is disposed on the opposite side of the bottom surface portion 31 from the recess direction of the main recess 40 (the arrow Z1 direction). Below, a plurality of light beams radiated from the center P0 of the light source 1 at different angles and incident on the convex portion 41, the first inclined surface of incidence 42, the second inclined surface of incidence 43, and the bottom portion 31 of the incidence surface 20 of the lens 3, respectively. The trajectory of light will be explained. Although FIG. 1 shows only the trajectory of light incident on the left side of the lens from the center P0 of the light source 1, the trajectory of light incident on the right side of the lens is the same as the trajectory of light incident on the left side of the lens and the center axis CA. is symmetrical, so the explanation is omitted.

As shown in the area A0 in FIG. 1, light emitted upward from the center P0 of the light source 1 and incident on the convex portion 41 passes through the lens 3 and is irradiated upward. Most of the light emitted from the center P0 of the light source 1 to the convex portion 41 enters the lens 3 through the flat surface 41a. Since the angle of incidence of light entering the lens 3 via the flat surface 41a is extremely small, the light travels straight through the flat surface 41a, travels through the lens 3, and reaches the first output inclined surface 11. FIG. Since the first slant surface 11 has a gentler slant than the second slant surface 12, the light reaching the first slant surface 11 from the flat surface 41a maintains the traveling direction in which it entered the flat surface 41a. The light passes through the first output inclined surface 11 and illuminates upward of the lens 3 .

Light emitted from the center P0 of the light source 1 and incident on the lens 3 via the convex outer peripheral surface 41b is refracted so as to approach the central axis CA when passing through the convex outer peripheral surface 41b. to reach The light that has reached the first output inclined surface 11 from the convex outer peripheral surface 41 b travels straight through the first output inclined portion and is irradiated upwardly of the lens 3 . The light incident on the lens 3 may be refracted in the direction opposite to the traveling direction in the width direction (the arrow X direction) when passing through the convex outer peripheral surface 41b.

Thus, the traveling direction of the light incident from the flat surface 41a provided in the central portion of the convex portion 41 hardly changes even after passing through the lens 3, and the traveling direction of the light incident from the outer peripheral surface 41b of the convex portion is , is refracted in a direction approaching the central axis CA. Therefore, the spread of the light emitted from the center P0 of the light source 1 to the convex portion 41 is suppressed, and the amount of light above the lens 3 is ensured.

As shown in area B0 in FIG. 1, light emitted from the center P0 of the light source 1 to the outside of the light in the area A0 and incident on the incident first inclined surface 42 is deflected by the lens 3 to the wide-angle side. . Since the light incident through the first incident inclined surface 42 enters the first incident inclined surface 42 substantially perpendicularly, the light travels straight through the first incident inclined surface 42 , advances through the lens 3 , and reaches the first outgoing inclined surface 11 . to reach The light reaching the first output inclined surface 11 from the first incident inclined surface 42 is refracted by the first output inclined surface 11 in a direction away from the central axis CA and is irradiated at a wide angle. The smaller the inclination of the first output inclined surface 11 from the plane perpendicular to the central axis CA, the larger the wide-angle refraction angle of the light in the area B0. However, if the inclination of the output first inclined surface 11 becomes gentler, the difference from the inclination angle of the incident first inclined surface 42 increases. The proportion of light reflected back into the lens 3 increases.

As shown in area C0 in FIG. 1, the light emitted from the center P0 of the light source 1 to the outside of the light in the area B0 and entering the second incident inclined surface 43 is divided into the first inclined surface 11 or the second inclined surface 43 and the second inclined surface 43. 2 Illuminated through the inclined surface 12 . Since the light incident through the second incident inclined surface 43 enters the second incident inclined surface 43 substantially perpendicularly, the light travels straight through the lens 3 while maintaining the traveling direction when incident on the second incident inclined surface 43. Then, as shown in region C01 in FIG. The light that has reached the first output inclined surface 11 from the second incident inclined surface 43 is refracted at the gentle first output inclined surface 11 in a direction away from the central axis CA. On the other hand, the light that has reached the exit second inclined surface 12 from the incident second inclined surface 43 is refracted at the steep outgoing exit second inclined surface 12 in a direction approaching the central axis CA, as shown in region C02 in FIG. be.

In this way, part of the light incident on the lens 3 via the second incident inclined surface 43 is deflected to the wide-angle side by the first outgoing inclined surface 11 above the outgoing surface 10 and distributed to the wide-angle side. Contribute to light. The remaining part of the light incident on the lens 3 via the incident second inclined surface 43 is deflected toward the front side (in the direction of the arrow Z1) by the outgoing second inclined surface 12 below the outgoing surface 10 and is reflected by the wall. Avoid part 5a.

As shown in area D0 in FIG. 1, light emitted from center P0 of light source 1 to the outside of the light in area C0 and entering from bottom surface portion 31 is largely deflected by lens 3. As shown in FIG. Light incident through the bottom portion 31 is refracted toward the front side by the substantially horizontal bottom portion 31 and reaches the inner side surface 51 of the sub-recess 50 . The light reaching the inner side surface 51 from the bottom surface portion 31 is totally reflected by the inner side surface 51, so that the traveling direction is changed to the opposite direction (right side in FIG. 1) in the direction perpendicular to the central axis CA (the direction of the arrow X). be done. The light totally reflected by the inner surface 51 reaches the first output inclined surface 11 from the left side of the lens. The light reaching the first inclined surface 11 from the inner surface 51 is refracted in the first inclined surface 11 toward the central axis CA, and is emitted toward the upper right side of the lens 3 .

FIG. 3 is an explanatory diagram illustrating the trajectory of light emitted from the left end portion of the light source of the lighting fixture according to Embodiment 1 of the present invention. In FIG. 3, a plurality of arrows indicate how the light emitted from the left end portion P1 of the light emitting surface of the light source 1 is deflected by the lens 3. As shown in FIG. In the following, the trajectory of the light is defined as the light in the region A1 incident on the convex portion 41, the light in the region B1 incident on the first inclined surface of incidence 42, the light in the region C1 incident on the second inclined surface of incidence 43, and the bottom surface. The light in the region D1 incident on the portion 31 will be described separately.

The light in the area A1 incident on the convex portion 41 is light emitted from the left end portion P1 of the light source 1 while tilting to the right from the optical axis direction (the direction of the arrow Z1). It is deflected to have a larger spread angle than the light in area A0. In particular, of the light in the area A1, the light incident on the connection portion on the left side of the drawing between the flat surface 41a and the convex outer peripheral surface 41b is directed to the wide-angle side at a larger angle than the light incident on the area other than the connection portion of the area A1. be deflected.

Since the light in the area B1 incident on the incident first inclined surface 42 is the light emitted from the left end P1 of the light source 1 in the optical axis direction (arrow Z1), the angle at which the light is deflected by the lens 3 is the center It is smaller than the light in the region B0 originating from P0.

In the light of the area C1, the inclination from the optical axis of the light traveling from the left end P1 of the light source 1 to the incident second inclined surface 43 is smaller than the inclination of the light traveling from the center P0 of the light source 1 to the incident second inclined surface 43. . Therefore, the light in the region C1 incident from the incident second inclined surface 43 reaches the first outgoing inclined surface 11 above the outgoing surface 10, and on the first outgoing inclined surface 11, the center P0 of the light source 1 is the starting point. The light is deflected to the wide-angle side at an angle smaller than that of the light in the region C01. Starting from the left end P1 of the light source 1, the maximum spread angle of the light in the area C1 emitted from the emission surface 10 is smaller than the light in the area C0 starting from the center P0 of the light source 1, and the light in the area C1 is The light is irradiated without being blocked by the wall portion 5a.

The light in area D1 that originates from the left end P1 of the light source 1 and enters the bottom surface 31 is also largely deflected by the lens 3, similarly to the light in area D0 that originates from the center P0 and enters the bottom surface 31, and is deflected along the central axis CA. The traveling direction changes to the opposite side in the direction perpendicular to (arrow X direction). The solid angle of light incident on the bottom portion 31 from the left end portion P1 of the light source 1 is larger than the solid angle of light incident on the bottom portion 31 from the center P0 of the light source 1 . Therefore, the proportion of light originating from the left end P1 of the light source 1 in the light incident from the left bottom surface portion 31 is greater than the proportion of light originating from the center P0 of the light source 1 .

FIG. 4 is an explanatory diagram illustrating the trajectory of light emitted from the right end portion of the light source of the lighting fixture according to Embodiment 1 of the present invention. In FIG. 4, a plurality of arrows indicate how the light emitted from the right end portion P2 of the light emitting surface of the light source 1 is deflected by the lens 3. As shown in FIG. In the following, the trajectory of the light will be described as follows: light in area A2 incident on the convex portion 41, light in area B2 incident on the first incident inclined surface 42, light in area C2 incident on the second inclined surface 43, and the bottom surface. The light in the region D2 incident on the portion 31 will be described separately.

The light in the area A2 incident on the convex portion 41 draws a trajectory obtained by horizontally inverting the light in the area A1 in FIG. 3 about the central axis CA.

The light in the area B2 that enters the first incident inclined surface 42 from the right end P2 of the light source 1 also has the first outgoing inclination, like the light that enters the first incident inclined surface 42 from the center P0 and the left end P1 of the light source 1. It exits through surface 11 . However, the inclination from the optical axis of the light traveling from the right end portion P2 of the light source 1 to the first incident inclined surface 42 is Greater than the slope.

In the light of the region C2, the inclination from the optical axis of the light traveling from the right end P2 of the light source 1 to the second incident inclined surface 43 is greater than the inclination from the optical axis of the light traveling from the center P0 to the second incident inclined surface 43. big. Therefore, the light incident through the second incident inclined surface 43 reaches the second outgoing inclined surface 12 below the outgoing surface 10 . The light in the region C2 is deflected toward the front side of the lens 3 when passing through the second outgoing inclined surface 12, which is steeper than the first outgoing inclined surface 11, and is irradiated without hitting the wall portion 51a.

The light in region D2 that originates from the right end portion P2 of the light source 1 and enters the bottom surface portion 31 is also largely deflected by the lens 3, similarly to the light in region D0 that originates from the center P0 and enters the bottom surface portion 31, and is deflected along the central axis CA. The traveling direction changes to the opposite side in the direction perpendicular to (arrow X direction). The solid angle of light incident on the bottom surface portion 31 from the right end portion P2 of the light source 1 is smaller than the solid angle of light incident on the bottom surface portion 31 from the center P0 of the light source 1 . Therefore, the proportion of light originating from the right end P2 of the light source 1 among the light incident from the bottom surface portion 31 on the left side is smaller than the proportion of light originating from the center P0 of the light source 1 .

FIG. 5 is a diagram showing a light distribution of the lighting fixture according to Embodiment 1 of the present invention. The horizontal axis of the figure indicates the angle of the traveling direction of light, and the front direction of the lens 3 (direction of arrow Z1 in FIG. 1) is 0°. The vertical axis represents the luminous intensity I. Here, the luminous intensity I is a physical quantity that relatively represents the brightness of light irradiated in each angular direction, and is expressed in arbitrary units.

As shown in FIG. 5, in the target light distribution It, the peak of the luminous intensity I is set at approximately 65°. Distributions Ia, Ib, Ic, Id, and I1 are distributions obtained with the lighting fixture of the first embodiment. Distribution Ia is the distribution of light in region A, distribution Ib is the distribution of light in region B, distribution Ic is the distribution of light in region C, and distribution Id is the distribution of light in region D. FIG. The light distribution I1 is a light distribution formed by summing the light distributions Ia, Ib, Ic, and Id of the four regions.

As shown in distribution Ib, the light in area B, that is, the light that enters the lens 3 via the first inclined surface 42 and is emitted from the exit surface 10 is distributed over an angle of 20 to 90°. In the distribution Ib, the luminous intensity I is lower near the angle of 65° than at the surrounding angles, which is caused by the dark portion 1b of the light source 1. Further, as shown in distribution Ic, the light in area C, that is, the light that is incident on lens 3 via second incident inclined surface 43 and emitted from exit surface 10 is distributed over an angle of 50 to 80°. As shown in the distribution Id, the light in the area D, that is, the light that enters the lens 3 via the bottom surface 31 and is emitted from the exit surface 10 is distributed over an angle of 40 to 70°.

As shown in FIGS. 1, 3, 4 and 5, according to the lens 3 of Embodiment 1, light can be emitted from the upper 40% of the height H1 of the lens 3, and the angle of view is wider than that of the conventional art. A distribution similar to the target light distribution It is obtained, which has a peak value at an angle of 65° on the side.

Regarding the sub-recess 50 of the lens 3, as described above, only the inner wall of the lens 3 on the central axis CA side is required, and the shape of the surface 52 farther from the central axis CA than the inner surface 51 may be any shape. good too. Although the cross-sectional shape of the sub-recess 50 has been described as being substantially triangular, as shown in FIG. It may be formed so as to be substantially parallel to the exit surface 10 . With the lens 3 having such a shape, the moldability of the lens 3 is improved.

FIG. 6 is a cross-sectional view showing a modification of the lighting fixture according to Embodiment 1 of the present invention. At the center of the flat surface 41a of the entrance surface 20 of the lens 3, a recess 41c recessed toward the exit surface 10 is formed. The width and height of the recess 41c may be set so that a probe of a measuring instrument such as a caliper gauge for measuring the thickness of the lens 3 can be inserted. After the lens 3 is molded, when the thickness of the lens 3 is measured, the probe provided at the tip of the arm of the measuring instrument is inserted into the recess 41c of the flat surface 41a. As a result, the arm of the measuring instrument is fixed to the lens 3, the tip of the arm is prevented from slipping on the surface of the lens 3, especially the flat surface 41a, and the thickness of the lens 3 can be easily measured.

Also, the range and the respective inclination angles of the first inclined surface 11 and the second inclined surface 12 may be appropriately set according to the size of the light source 1 . Further, as shown in FIG. 1, the depth H2 of the groove of the sub-recess 50 is such that the bottom surface of the groove touches the imaginary line L connecting the center P0 of the light source 1 and the upper end portion 5a1 of the wall portion 5a, which is the partition wall. It should be set to a degree. Further, the output second inclined surface 12 is provided in a region including the intersection point PL between the output surface 10 and the imaginary line L on the output surface 10 .

As described above, according to the light distribution control lens 3 of Embodiment 1, the main concave portion 40 and the bottom portion 31 are the incident surface 20, the sub concave portion 50 is provided outside the main concave portion 40, and the emission surface 10 has two slopes with different slopes. As a result, the light polarized at a wide angle is emitted from the upper part of the lens 3, and the light emitted at a wide angle from the light source 1 and incident on the lens 3 (for example, the light in the area C02 and the light in the area D0) is largely deflected and used as the emitted light. can be used. As a result, even if there is an obstacle such as a partition wall outside the lens 3, the peak of the luminous intensity I of the emitted light can be made wider than in the conventional case while suppressing the decrease in the amount of light.

In the light distribution control lens 3, the first output inclined surface 11 outputs at least part of the light incident through the first incident inclined surface 42, and the first output inclined surface 11 and the second output inclined surface 12 emits the light that has entered through the incident second inclined surface 43 . As a result, a plurality of light distribution control devices provided on each of the exit surface 10 and the entrance surface 20 can control the luminous intensity I by avoiding the partition wall (the wall portion 5a) while widening the peak of the luminous intensity I of the luminous intensity distribution. It can be easily realized by combining inclined surfaces.

Embodiment 2.
FIG. 7 is an explanatory diagram illustrating the trajectory of light emitted from the right end portion of the light source of the lighting fixture according to Embodiment 2 of the present invention. In the optical system 100a of the second embodiment, the sub-recess 150 of the lens 3 has a trapezoidal cross section, and the groove width W2 of the sub-recess 150 is wider than that of the first embodiment. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

The sub-recess 150 includes an inner side surface 151 on the central axis CA side, a facing surface 152 that is farther from the central axis CA than the inner side surface 151 and faces the inner side surface 151, and a total internal reflection that connects the inner side surface 151 and the facing surface 152. a surface 153; The inner side surface 151 corresponds to the inner side surface 51 of the first embodiment. The opposing surface 152 is inclined from the central axis CA so as to be closer to the bottom surface 30 as it is separated from the central axis CA of the lens 3 . The total reflection surface 153 is the groove bottom surface of the sub-recess 150 , and is inclined so as to be substantially parallel to the output first inclined surface 11 provided above the total reflection surface 153 on the output surface 10 . The total reflection surface 153 totally reflects the light reflected by the first output inclined surface 11 among the light incident through the first incident inclined surface 42 .

FIG. 7 shows the trajectory of light in region B that is incident on the first incident slope 42 from the right end portion P2 of the light source 1 and deflected by the lens 3, divided into two regions B2 and B3. The light in region B forms a distribution spread over angles of 20-90° as shown in FIG. As shown in area B2 in FIG. 4, the light incident on the first incident inclined surface 42 from the right end P2 of the light source 1 is deflected by the lens 3 to the wide-angle side, and the light distribution of the distribution Ib is mainly 70 to 90°. forming Since the light in the area B is incident on the first output inclined surface 11 at an angle close to the critical angle, as shown in area B3 in FIG. The light incident on the upper part is reflected by the first outgoing inclined surface 11 and is not emitted from the outgoing surface 10 .

As described above, in Embodiment 2, the surface farther from the central axis CA than the inner side surface 151 of the sub-recess 150 has the opposing surface 152 and the total reflection surface 153 . As a result, the light in the region B3 returned into the lens 3 by the first output inclined surface 11 is totally reflected again by the total reflection surface 153 of the sub-recess 150, and the output light provided outside the first output inclined surface 11 is reflected again. The light is emitted from the second inclined surface 12 .

As a result, in the second embodiment, the component of the light in the area B, which is incident from the first incident inclined surface 42 and is irradiated from the first outgoing inclined surface 11, that is, the light in the area B2, is further added to the first incident inclined surface 42 , and the component irradiated from the second outgoing inclined surface 12, that is, the light of the region B3 is added.

FIG. 8 is a diagram showing the light distribution of the lighting fixture according to Embodiment 2 of the present invention. A light distribution I2 is a light distribution obtained by the lighting fixture of the second embodiment. In the example shown in FIG. 8, in the light distribution I2, the luminous intensity I is higher at an angle of 40 to 60° than in the light distribution I1 obtained by the lighting fixture of the first embodiment. In other words, the lens 3 is arranged so that the peak of the light distribution is set on the wide-angle side, and the component incident from the incident first inclined surface 42 and emitted from the outgoing second inclined surface 12 compensates for the light with an angle of 40 to 60°. With this configuration, it is possible to increase the ratio of the amount of light on the wide-angle side in the emitted light. As a result, it is possible to increase the interval at which lighting fixtures having the optical system 100a are arranged, and to illuminate a space of a certain size with a smaller number of fixtures than in the conventional art.

Embodiment 3.
FIG. 9 is a cross-sectional view of a lighting fixture according to Embodiment 3 of the present invention. In Embodiment 3, one lens 130 is configured by connecting two lens bodies 3a and 3b corresponding to the lens 3 of Embodiment 2. FIG. In the third embodiment, items that are not particularly described are the same as those in the second embodiment, and the same functions and configurations are described using the same reference numerals.

The lens 130 of the third embodiment includes the main concave portion 40, the sub concave portion 150, the bottom portion 31, the first outgoing inclined surface 11, and the second outgoing inclined surface 12 of the lens 3 according to the second embodiment. A plurality of lens bodies 3a and 3b are provided. The lens bodies 3a, 3b have a rotationally symmetrical shape. The lens 130 has a shape in which a plurality of lens bodies 3a and 3b are connected. Specifically, the lens bodies 3a and 3b are adjacent to each other in the width direction (the direction of the arrow X) so that the bottom surfaces 30 are continuous surfaces, and are connected between the sub-recesses 150 of the lens bodies 3a and 3b. ing. In this way, when the desired amount of light is large, the number of lens bodies 3a and 3b can be increased to obtain the desired amount of light. Further, the lens 130 may be integrally molded in a shape in which a plurality of lens bodies 3a and 3b are connected.

FIG. 10 is an exploded perspective view showing a modification of the lighting fixture according to Embodiment 3 of the present invention. FIG. 11 is an external perspective view showing a modification of the lighting fixture according to Embodiment 3 of the present invention. FIGS. 10 and 11 exemplify a lighting fixture 200 as an emergency light having an optical system 100b. The luminaire 200 includes an optical system composed of a lens 130, a plurality of light sources 1 corresponding to the respective lens bodies 3a and 3b, a light source module substrate 2, and a socket 4 for fixing the light source module substrate 2 and the lens 3. 100b. The lighting fixture 200 also includes a heat dissipation sheet 6 , a support base 7 that supports the optical system 100 b , and screws 8 for attaching the entire optical system 100 b to the support base 7 .

Since each light source 1 and light source module substrate 2 are the same as in the first embodiment, description thereof is omitted. In Embodiment 2, the socket 4 is formed with a light entrance hole 4 a corresponding to each light source 1 . The heat radiation sheet 6 is arranged under the light source module substrate 2 and cools the light source 1 and the light source module substrate 2 by radiating heat from the light source module substrate 2 .

The lighting fixture 200 also includes a housing 9 . The optical system 100b of Embodiment 3 is attached to the support base 7 and housed in the housing 9. As shown in FIG. As shown in FIG. 11, in the lighting fixture 200, the lens 130 and the screw 8 are exposed from the opening of the housing 9 so as not to protrude upward (in the direction of the arrow Z1) from the upper surface 9a of the housing 9. . In such a lighting fixture 200, the housing 9 including the opening wall portion 9b functions as a partition wall with respect to the common light source.

It should be noted that the embodiments of the present invention are not limited to the above embodiments, and various modifications can be made. For example, the lens 3 may be made of resin instead of glass.

Also in the lenses 3 and 130 of Embodiments 2 and 3, even if the flat surface 41a of the convex portion 41 provided in the central portion of the main concave portion 40 is provided with a concave portion 41c as shown in FIG. good.

Further, in Embodiment 3, the lighting device 200 includes the optical system 100b. may be

Reference Signs List 1 light source 1a light emitting part 1b dark part 2 light source module substrate 3, 130 lens (light distribution control lens) 3a, 3b lens body 4 socket 4a light entrance hole 5 accommodation part 5a wall part 5a1 upper end Part 6 Heat dissipation sheet 7 Support base 8 Screw 9 Housing 9a Upper surface (of housing) 9b Opening wall 10 Output surface 11 Output first inclined surface 12 Output second inclined surface 20 Incidence surface 30 bottom surface 31 bottom surface portion 40 main concave portion 41 convex portion 41a flat surface 41b convex portion outer peripheral surface 41c recess 42 incident first inclined surface 43 incident second inclined surface 44 incident third inclined surface , 50, 150 sub-recessed portion, 51 inner surface, 52 surface, 100, 100a, 100b optical system, 151 inner surface, 152 opposing surface, 153 total reflection surface, 200 luminaire, I luminous intensity, H1, H2 height, P0 center , P1 left end, P2 right end, W1 opening width, W2 groove width.

Claims (7)

A light distribution control lens that has an incident surface on which light is incident and an output surface from which light is emitted, and controls the light distribution,
a main recess formed so as to be recessed from the bottom surface toward the output surface;
a sub-recess that is a ring-shaped groove recessed from the bottom surface toward the output surface so as to surround the main recess;
has
The exit surface is
a first output inclined surface provided above the main concave portion in a wider range than the main concave portion and inclined from a plane perpendicular to the central axis so as to be closer to the bottom surface as the distance from the central axis of the light distribution control lens increases; ,
a second outgoing inclined surface provided to surround the first outgoing inclined surface and steeper than the first outgoing inclined surface;
has
The main recess and a bottom surface portion between the main recess and the sub-recess on the bottom surface are the incident surface,
The inner surface of the sub-recess on the central axis side extends in the central axis direction in a cross section of the light distribution control lens along the central axis, and totally reflects light incident through the bottom surface,
The first output slanted surface directs the light incident through the main concave portion to the first slanted surface of output from an angle from the central axis before the light reaches the first slanted surface of output. refracting so that the angle from the central axis after refracting at is large ,
The second output inclined surface directs the light incident through the main concave portion to the second output inclined surface at an angle from the central axis before the light reaches the second output inclined surface. A light distribution control lens that refracts so that the angle from the central axis becomes smaller after being refracted at . The main concave portion is
a convex portion provided in a central portion of the main concave portion including the central axis and bulging toward the bottom surface;
a first incident inclined surface provided to surround the outer periphery of the convex portion and inclined from a plane perpendicular to the central axis in a cross section of the light distribution control lens along the central axis;
a second inclined plane of incidence that is provided so as to surround the first inclined plane of incidence and is steeper than the first inclined plane of incidence;
has
The first emission inclined surface emits at least part of the light incident through the first incident inclined surface,
2. The light distribution control lens according to claim 1, wherein the first outgoing inclined surface and the second outgoing inclined surface emit light incident through the second incoming inclined surface. A surface farther from the central axis than the inner surface of the sub-recess,
a facing surface facing the inner surface and inclined from the central axis so as to be closer to the bottom surface as the distance from the central axis increases;
a total reflection surface that connects the inner surface and the opposite surface and totally reflects light that is reflected by the first output inclined surface among the light incident through the first incident inclined surface;
The light distribution control lens according to claim 2, comprising: A plurality of sets of the main concave portion, the sub-concave portion, the bottom surface portion, the first inclined surface for emission, and the second inclined surface for emission are provided, and the plurality of adjacent sets are connected between the sub-concave portions. The light distribution control lens according to any one of claims 1 to 3. The light distribution control lens according to any one of claims 1 to 4, wherein a recess that is recessed toward the exit surface is formed in the center of the main recess. The light distribution control lens according to any one of claims 1 to 5;
a light source arranged at a position opposite to the direction of depression of the main recess with respect to the bottom surface of the light distribution control lens, the light source emitting light;
a wall portion disposed outside the outer circumference of the light distribution control lens and extending along the central axis of the light distribution control lens;
A lighting fixture with a light entrance control member disposed between the light distribution control lens and the light source, having a light entrance hole corresponding to the entrance surface, and blocking the light emitted from the light source from entering the sub-recessed portion; 7. The luminaire of Claim 6.

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