JP2016046067A - Wide-angle diffusion optical system and luminaire using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology suitable to change the light distribution direction of a light source.SOLUTION: In an optical member arranged so as to face a light source, an emission surface of the optical member is shaped so that a curvature center C of the emission surface at a position P on the emission surface in a direction at a certain angle with respect to an optical axis of the light source exists at a position deviated from the optical axis; and an incident surface of the optical member has one or more shapes in order of at least a concave surface and a convex surface toward a direction at a certain angle with respect to the optical axis of the light source from the front face side of the light source.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical system that changes a light distribution of a light source.

  As background art, there exists patent document 1, for example. The summary of Patent Document 1 has an object of “increasing indirect light of a lighting fixture” and, as a solution, “a first LED light source and a second LED light source mounted on a substrate and electrodes on the substrate”. And a first optical member corresponding to the first LED light source, a second optical member corresponding to the second LED light source, and an optical member connecting portion connecting the first optical member and the second optical member. The luminous intensity distribution of the emitted light from the first optical member is different from the luminous intensity distribution of the emitted light from the second optical member, and the first optical member, the optical member connecting portion, and A composite optical member is configured by the second optical member, and the composite optical member describes an illumination device that covers at least a part of an electrode.

JP 2014-13744 A

  As light sources for lighting devices such as ceiling lights and base lights, LEDs (Light Emitting Diodes) are being used in place of conventional fluorescent and incandescent bulbs for environmental considerations and low power consumption. . The LED light source has a light distribution different from that of conventional fluorescent lamps and incandescent lamps, has the highest luminous intensity toward the front of the light source, and is very dark in the orthogonal direction, that is, in the horizontal direction. is there. As described above, since the LED is a light source having high directivity, there is a concern that when it is mounted on a conventional lighting fixture, the lighting method is different, so that the lighting environment becomes different.

  As described above, when an LED light source with high directivity is used, only the front surface of the light source is illuminated brightly, and there is a drawback that light hardly reaches in another direction and becomes dark. Become important. For example, in a lighting device, it is preferable that the light emitting surface emits light uniformly over a wide range. In order to realize this, there is a countermeasure method such as changing the arrangement in such a way that the direction in which the light source shines brightly is directed toward the wide direction where the light is dark. However, the direction of the light source restricts the arrangement direction of the light source substrate on which the light source is arranged. In many cases, the light source board also has a function of efficiently exhausting heat generated from the light source, and the light source board has a wide contact area with a structure such as a casing, chassis, and heat radiating fin that are relatively excellent in heat conduction. It is desirable that they are arranged.

  In view of such circumstances, it is desirable that the light source is arranged on a flat substrate having a large area, and changing the light source arrangement direction changes the direction of the light source substrate, so heat dissipation is considered. In order to improve the performance of the lighting device due to insufficient heat dissipation and to improve heat dissipation, the structural design specialized in the arrangement of the light source substrate may cause an increase in the structure cost. For these reasons, it is desirable that the light source substrate 1 be realized as a flat substrate in view of heat dissipation and manufacturing costs.

  Patent Document 1 discloses a technique related to the arrangement direction of the light source, but even with the configuration described in Patent Document 1, the function of diffusing the light beam emitted near the optical axis of the light source is weak and wide. There is a problem that the amount of light flux in the angular direction cannot be secured. Therefore, when it is intended to illuminate a wide range, the arrangement of the light sources is restricted.

  The present invention has been made in view of the above-mentioned problems of the prior art, and by changing the shape of the optical system in the vicinity of the light source to a shape in which the curvature is changed a plurality of times from the central part to the peripheral part, in a wide angular direction. A technique suitable for distributing the luminous flux is provided.

The present invention is characterized by the structures described in the claims.
More specifically, the optical system according to the present invention is an optical member arranged to face the light source,
The exit surface of the optical member has a shape in which the center of curvature C of the exit surface at a point P on the exit surface in a direction that makes an angle with the optical axis of the light source exists at a position off the optical axis of the light source. An optical member, wherein an incident surface of the optical member has at least one pair of shapes in the order of at least a concave surface and a convex surface in a direction that is angled with respect to the optical axis of the light source from the front side of the light source. It is an optical member.

  According to the configuration of the present invention, most of the light flux from the light source can be expanded, and the light flux emitted from the light source can be distributed in a wide direction.

Sectional drawing which shows the 1st Example of the optical member which concerns on this invention. Sectional drawing which shows one structural example of the entrance plane of the optical member which concerns on this invention. Sectional drawing which shows the optical path of the optical member which concerns on a 1st Example. Sectional drawing which shows one structural example of the conventional optical system. The exploded view of the optical unit which concerns on a 5th Example. The exploded view of the optical unit which concerns on a 5th Example. An example of the illuminating device provided with the optical member of this invention. Sectional drawing of the illuminating device provided with the optical member of this invention. The front view of the optical member of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The configuration of the first embodiment of the present invention will be described with reference to FIG. Here, FIG. 1 shows a cross-sectional view of the light guide according to the first embodiment.

  As shown in FIG. 1, the optical member according to the present embodiment is an optical member arranged so as to face the light source, and the light emitting surface of the optical member is on the light emitting surface in a direction that forms an angle with the optical axis of the light source. The center of curvature C of the exit surface at the point P is a shape that exists at a position off the optical axis of the light source, and the incident surface of the optical member is light from the light source from the front side of the light source. An optical member having a pair of shapes in the order of at least a concave surface and a convex surface in an angled direction with respect to an axis.

  This optical member is disposed so as to cover the light source or float on the light exit surface side of the light source. FIG. 1 shows a configuration including a light source substrate 11 having a wiring pattern for supplying power to a light source.

  For example, an LED can be used as the light source, and a light beam is emitted toward the optical member 2 disposed so as to face the light source. Various types of light sources can be selected as the light source 1, and for example, a white LED that emits white light can be used.

  An example of the configuration of the white LED will be described. It is composed of an LED chip that emits blue light upon receiving electric power, and a phosphor that is excited by receiving the energy of blue light from the LED chip and emits light in a spectrum in a wavelength region from green to red. The phosphor may be mixed in a resin for sealing the LED chip. In addition, the phosphor may have a light emission spectrum that looks yellow when a plurality of phosphors that emit red and green light are mixed and excited to emit light. Of course, the emission spectrum of the phosphor may be changed so that light is emitted at different color temperatures. Further, in one LED, a large light amount type LED on which a plurality of light emitting chips are mounted may be used. In an LED equipped with a plurality of LED chips, it is preferable to arrange the LED chips in, for example, a rectangular shape or a concentric circle so as to be symmetrical with respect to the center of the light emitting surface (light emitting surface) of the LED. It is not limited to this.

  The light source may be provided with an optical component such as a lens or a reflector for adjusting the light distribution and improving the light extraction efficiency. As such an optical component, for example, a convex lens formed of a transmissive material, a metal-deposited mirror, or a reflector using total reflection can be provided at the periphery of the chip.

  The light source is mounted on the light source substrate. Although FIG. 1 illustrates a configuration in which one light source is mounted on a light source substrate, a plurality of light sources may be mounted as necessary.

  In addition to the light source, the light source substrate controls a drive circuit (driver) and wiring for adjusting the supplied power to a desired power and supplying it to the light source, or a current amount or voltage to the light source. It is connected to electronic parts such as control circuits and electric circuits.

  As the light source, a plurality of light sources having different performances may be arranged. For example, if there is a plurality of light sources with different emission colors and each of the emission colors can be driven by an independent system circuit, the emission color emitted from the optical member can be controlled by controlling the power input to each system. Since the amount of light can be adjusted every time, an optical system capable of adjusting the emission color as a whole can be provided.

  It is desirable that the optical characteristics of the surface of the light source substrate have little absorption. Although the optical member is made of a transparent material, the light beam emitted from the light source is incident due to Fresnel reflection occurring at the interface between the optical member and the air due to the difference in refractive index between the optical member and air. The luminous flux of the part is reflected and cannot transmit all the luminous flux. In order to improve the efficiency of the illuminating device, it is desirable that all of the luminous flux emitted from the light source is transmitted through the optical member. Therefore, it is desirable that there is a mechanism for allowing the luminous flux that has not been transmitted by Fresnel reflection to enter the optical member again. . As a mechanism for causing the light beam reflected at the interface between the optical member and the air to enter the optical member again, there is a method using the surface characteristics of the light source substrate. By using a highly reflective material on the surface of the light source substrate, it is possible to have a function of reflecting the light beam reflected and returned by the optical member toward the optical member again. A white highly reflective paint may be used on the surface of the light source substrate, or a metal glossy surface that is less absorbed by the light source substrate may be used. As another method, a configuration in which a reflection sheet having a high reflectance is disposed on the surface of the light source substrate instead of using the optical characteristics of the surface of the light source substrate. In this method, it is desirable that the shape of the reflection sheet is processed so that the area where the substrate around the light source is exposed is reduced.

  The optical member has a function of guiding the light beam from the light source to the inside of the optical member while refracting the light beam on the incident surface, and refracting the light beam on the light exit surface. The light beam from the light source is incident from the incident surface, passes through the inside of the optical member, and has a function of emitting most of the incident light beam from the output surface.

The optical member 2 is disposed so as to face the light source.
As the material of the optical member 2, a light transmissive material such as glass or plastic can be used. For example, polycarbonate or acrylic can be used when plastic with excellent productivity is taken as an example. As a method for manufacturing the optical member, for example, injection molding in which a material is heated to increase fluidity and poured into a mold and then cooled and solidified can be used.

  If the shape of the optical member is engraved in a mold for injection molding the optical member, the optical member can be integrally molded on the surface of the optical member. Since this manufacturing method can be integrally molded, it is a manufacturing method that can suppress the manufacturing cost because there are relatively few manufacturing steps. As for the mold used for injection molding of the optical member, it is preferable that the light entrance surface and the mold surface for molding the exit surface of the optical member are mirror-polished. In other locations, the surface may be roughened by a method such as sand blasting to form a so-called textured surface or pear surface.

  The entrance surface and the exit surface may be formed of, for example, a spherical surface, a flat surface, or other types of curved surfaces.

  The incident surface 22 of the optical member 2 will be described with reference to FIG.

  The incident surface 22 indicates that it has at least one pair of shapes in the order of at least a concave surface and a convex surface from the front side of the light source 1 toward an angle with respect to the optical axis of the light source. On the front side of the light source 1, there is a concave surface 221, which is connected to the convex surface 222 via a boundary 2212 between the concave surface and the convex surface as the angle with respect to the optical axis of the light source 1 is increased. Further, a concave surface 223 and a surface 224 are connected in a direction that is angled from the optical axis of the light source 1.

  Next, the optical path of the light beam emitted from the light source 1 will be described with reference to FIG. The light beam incident on the concave surface 221 is refracted in a direction in which the angle is increased with respect to the optical axis of the light source 1, then passes through the inside of the optical member 2, and further spreads with respect to the optical axis when exiting from the output surface 211. Refracted in the direction. In FIG. 2, the exit surface 211 is illustrated as a flat surface, but may have a convex curvature.

  The light beam incident on the convex surface 222 is refracted in the direction toward the center of curvature of the convex surface 222. That is, the light passes through the optical member 2 at a divergence angle converged from the divergence angle of the light beam in the air from the light source 1 toward the convex surface 222. When the light is emitted from the emission surface 212, the light is refracted in a direction extending with respect to the optical axis of the light source and emitted. Since the exit surface 222 has a center of curvature in a direction that is angled from the optical axis of the light source, it has a function of converging the luminous flux with the direction as an axis. Due to the combination of the entrance surface 222 and the exit surface 212, the light beam incident on the convex surface 222 from the light source 1 is converged by the effect of the convex lens of the convex surface 222 and can be guided to the exit surface 212 with a relatively narrow divergence angle. Therefore, since the light beam incident on the convex surface 222 has a relatively narrow divergence angle, the light beam emitted from the convex surface 222 also has a relatively narrow divergence angle. Since the direction of emission of this light beam is a wide direction having an angle with the optical axis of the light source, the divergence angle is narrow and the light beam propagates so that the energy is concentrated in a wide direction so as to go in a wide direction from the optical axis. It is possible to efficiently spread the light beam emitted from the light source 1.

  Further, the concave surface 223 may be provided on a surface in a direction inclined from the light source 1 rather than the convex surface 222. The thickness of the optical member may be limited due to manufacturing restrictions, and the arrangement relationship between the light source 1 and the optical member may be limited. At that time, it may not be possible to capture all of the emitted light beam from the light source 1 with the concave surface 221 and the convex surface 222 alone. You may provide the surface 223 and the surface 224 for receiving the light beam of the wide angle with respect to the optical axis of the light source 1 which the convex surface 222 cannot receive. The surface 223 is desirably a concave surface so that the light beam emitted from the light source 1 can be received. Since the light beam received by the surface 223 is originally a light beam directed in a wide direction, the function of bending the emission direction does not have to be relatively strong. Therefore, it is desirable that the configuration prioritize receiving the light beam. Since it is a shape which can be covered so that the light source 1 may be wrapped if it is a concave surface shape, it is easy to receive the light beam from the light source 1.

  Further, a surface 224 may be provided. When the light beam incident from the incident surface 223 is configured to enter the flat portion 23, the light may enter the flat portion 23 at an angle larger than the critical angle with respect to the normal line of the flat portion 23. At that time, as shown in FIG. 4, since the light is totally reflected by the flat portion 23, the light beam is confined inside the optical member 2, which causes a decrease in emission efficiency. As shown in FIG. 3, when a surface 224 having an angle with respect to the emission surface of the light source 1 is provided, it is possible to prevent a decrease in emission efficiency.

  The light beam incident on the surface 224 is refracted and travels in a direction closer to the optical axis of the light source 1. Therefore, it becomes easy to enter not the flat part 23 but the output surface 212. FIG. Unlike the flat portion 23, the exit surface 212 is not a surface in the direction of confining the light beam in the optical member 2, so that the light beam incident on the surface 212 from the surface 224 can be emitted.

  The incident light beam can be emitted because the light beam is emitted from the emission surface 212 at the flat portion 23. Therefore, with this configuration, it is possible to provide an optical member with high efficiency while effectively spreading the light beam emitted from the light source 1 with respect to the optical axis.

  In the optical member arranged to face the light source, the light guide according to the present embodiment has a curvature of the exit surface at a point P on the exit surface in a direction in which the exit surface of the optical member forms an angle with the optical axis of the light source. An optical member having a shape in which the center C is located at a position off the optical axis of the light source, and the incident surface of the optical member is angled with respect to the optical axis of the light source from the front side of the light source The optical member has a shape in which the curvature of one or more pairs continuously changes in the order of at least a concave surface and a convex surface.

  In the present embodiment, as shown in FIG. 2, if the concave surface 221 and the boundary 2212 of the convex surface 222 are configured to be continuous in the first derivative, the light beam emitted from the light source 1 When the light is refracted by the incident surface 22, the refraction angle also changes continuously. Therefore, when the light distribution of the light source 1 is continuously changing, the light distribution of the light beam emitted from the light guide 2 is also continuous. In this way, when the optical member having the configuration of the present embodiment is used, the light distribution of the emitted light beam changes smoothly, and therefore the illuminance distribution of the irradiation destination also changes smoothly. In addition, it can provide a lighting environment with low brightness unevenness and high visual quality. A lighting device may be configured by mounting a plurality of combinations of a light source and an optical member. In this lighting device, since the light distribution distribution that smoothly changes from the optical member is superimposed, the spatial frequency is high. It is possible to provide an illuminating device in which bright lines that appear to suddenly increase in brightness and dark lines that appear to suddenly become dark are less likely to occur and the light is uniform. Or it can be used for the illumination used for the display apparatus which shows a user the emitted light beam from an optical member directly, or a video display apparatus, and the brightness | luminance unevenness of appearance can be improved.

  In the present embodiment, a configuration example in which the emission surface 21 of the optical member of the first or second embodiment is convex is shown. If the exit surface 21 is convex, the light beam that has arrived from the entrance surface 22 is refracted in the converged direction when it is transmitted through the exit surface 21 and exits. Therefore, the light beams from the light source 1 emitted from the emission surface 23 can be emitted from the surface 211 to the surface 23 so as not to cross each other. As a result, it is possible to suppress the occurrence of unevenness in which the brightness is locally increased due to the crossing of the light beams.

  In this embodiment, in the optical member of any one of the first to third embodiments, the light beam in the direction connecting the curvature center of the convex surface 222 provided on the incident surface 22 from the light source 1 is refracted on the output surface, and the light source The structural example which an angle opens with respect to an optical axis is shown.

    The light beam from the light source 1 is refracted in a converging direction so that the light beam incident on the convex surface 222 of the incident surface 22 is converged with respect to the incident light beam from the light source 1 toward the center of curvature of the convex surface 222. Since the light beam is refracted in the direction that is refracted by the emission surface 21 and spreads with respect to the optical axis of the light source 1, the converged light beam is also a light beam concentrated in the direction of the light beam. As a result, according to the optical member having the configuration of the present embodiment, the luminous flux emitted from the light source 1 can be propagated in a direction that spreads with respect to the optical axis of the light source 1 and has a high energy density. An optical member that can emit many light beams in the direction can be provided.

Next, a configuration example of the fifth embodiment of the present invention will be described with reference to FIGS.
Here, FIGS. 5 and 6 are exploded views of the optical unit according to the fifth embodiment. As shown in FIG. 5, the optical system according to this example is an optical unit in which the optical member according to any one of Examples 1 to 4 and a light source are combined.

  As in this embodiment, if the optical unit is a combination of the optical member according to any one of Embodiments 1 to 4 and a light source, the light distribution is obtained by diffusing the light beam emitted from the light source 1 in the direction away from the optical axis. Can provide an optical unit. In the optical unit, the optical member 2 is disposed so as to cover the light source 1 or in front of the emission surface of the light source 1 so that the light beam from the light source 1 can be received. The light beam received by the optical member 2 is refracted by the entrance surface 22 and the exit surface 21 of the optical member 2. Since the optical member of the present embodiment is the optical member 2 described in any one of the first to fourth embodiments, energy is actively concentrated in the direction in which the light beam from the light source 1 spreads with respect to the optical axis of the light source 1. The light beam having a wide light distribution is emitted. As described above, according to the configuration of the present embodiment, an optical unit that emits a large amount of light beams in a wide direction can be provided effectively, and an illumination device that illuminates a wide range brightly, or a direction opened from the optical axis of the light source 1 Therefore, it is suitable for a display device that emits light with high luminance when the optical member is viewed from the top.

  Further, as shown in FIG. 6, the shape of the optical member 2 may not be a rotation target. As shown in the figure, when the axis of the optical member 2 is extended only by one, the optical characteristics of the optical unit in which the light source 1 and the optical member 2 are combined with respect to a change in the relative position of the light source 1 and the optical member 2 in the major axis direction The change of can be made small. Therefore, the error sensitivity is dull and stable by directing the long axis of the optical member 2 in a direction in which the relative arrangement tends to vary so that the change sensitivity of the optical characteristics of the optical unit with respect to the relative arrangement of the light source 1 and the optical member 2 becomes small. An optical unit exhibiting optical characteristics can be provided.

  Next, a configuration example of the sixth embodiment of the present invention will be described with reference to FIG.

  Here, FIG. 7 is an example of an optical member mounted on the illumination device according to the sixth embodiment.

  As shown in FIG. 7, the illumination device according to the present embodiment includes at least one optical unit in which the optical member 2 described in any of the first to fourth embodiments and the light source 1 are combined, and includes a housing. It is the illuminating device provided with the body 4 and the power supply. The light source 1 is electrically connected to a light source substrate 11 for supplying and fixing electric power, and an optical member 2 is provided so as to cover the light source substrate 11. The housing 4 is preferably made of a material having high electric heating performance such as aluminum, and it is desirable that the heat generated from the light source substrate 11 is transferred and radiated. In general, since the light source 1 has a property that the efficiency decreases as the temperature increases, it is possible to suppress the decrease in the light emission efficiency of the light source 1 by radiating the heat generated from the light source 1 through the light source substrate 11. I can do it. The optical member 2, the light source substrate 11, and the housing 4 are assembled by screwing and fitting, respectively. Although not shown, a power source for supplying power to the light source substrate 11 is provided.

  FIG. 8 is a cross-sectional view of the illumination device of this embodiment. The light beam emitted from the light source 1 is emitted through the optical member 2 and travels toward the shade 5 having diffusibility and transmission characteristics. As shown in FIG. 8, the light beam emitted from the optical member 2 is also emitted to a place away from the light source 1 due to the effect that the optical member 2 emits a large amount of light beam in the direction of wide opening from the optical axis of the light source 1. Propagating light. Therefore, since the shade 5 is irradiated over a wide range by the optical member 2, it is possible to provide an illumination device in which the entire shade 5 shines brightly. The luminous flux emitted from the light source 1 is concentrated only in front of the light source 1, and the area of the shade 5 where the light source 1 does not exist becomes dark and the illuminance distribution on the shade 5 becomes uneven. By providing the member 2, this problem can be solved.

  The optical system according to the present embodiment is the illumination apparatus described in the sixth embodiment, and is an illumination apparatus in which a plurality of optical members 2 are integrated. FIG. 7 illustrates a state in which the optical member 2 is integrally molded. With an integrated structure, the relative arrangement positions of the plurality of light sources 1 and optical members 2 can be arranged with high accuracy, and even when the number of optical members 2 is provided as many as the number of light sources 1, they are integrated. Since the manufacturing process can be reduced, the manufacturing time can be shortened and the manufacturing cost can be reduced, so that a low-cost lighting device can be provided.

  Next, a configuration example of the eighth embodiment of the present invention will be described with reference to FIG.

Here, FIG. 9 is a front view of the optical member 2 of the illumination apparatus according to the eighth embodiment.
As shown in FIG. 9, the illumination device according to the present embodiment is the illumination device according to the sixth to seventh embodiments, and includes two or more types of light sources having different emission characteristics, and at least two or more different light sources. The illumination device includes the optical member 2 having a shape. FIG. 9 shows an optical member 2 that is integrally molded as the present embodiment. The optical members 2 are arranged on concentric circles. However, in some cases, the optical members 2 may have a lattice shape or a staggered shape, and the arranged region may be a rectangle instead of a circle.

  Since the arrangement positions of the respective light sources are different, it is necessary to mix the light beams from the respective light sources in order to realize light emission without unevenness as the illumination device. Therefore, if a plurality of types of optical members 2 are mounted according to the arrangement positions of the light sources, the light beams from the respective light sources can be mixed effectively. For example, FIG. 9 shows an example in which the optical member 2A and the optical member 2B are properly used. For example, the optical member 2A has a light distribution that emits light strongly in the direction toward the center, and 2B has a light distribution that emits light wider than 2A. A case where a light source has a plurality of light emission characteristics, for example, a case where light sources having different emission colors are mounted will be described. If a plurality of light sources having different emission colors are mounted, the color of the light emitted from the lighting device can be adjusted by changing the light emission intensity of each light source. For example, a daylight white light source and a light bulb In the case where color light sources are combined, it is possible to provide an illuminating device in which the luminescent color of the illuminating device can be adjusted within the range of the color temperature of each luminescent color, while the entire device is neatly illuminated and color unevenness is suppressed.

  The optical system according to the present embodiment is the illumination apparatus according to the eighth embodiment, and includes two or more types of light sources having different emission colors, and one of the emission colors is blue. Device.

  The lens present in the human eye has a low blue transmittance with age. In such a case, there is a problem that it is difficult to identify blue. In this case, the visibility can be enhanced by enhancing the blue color of the light that illuminates the object to be viewed. If it is an illuminating device of the structure of a present Example, the blue light source with which the illuminating device was equipped will be light-emitted, the blue of illumination light will be strengthened, and the visibility of a target object will be improved. Furthermore, the lighting environment according to a user's request | requirement can be provided by controlling so that the light emission intensity of a blue light source may be adjusted. Moreover, since the illumination device of the present embodiment has a characteristic that realizes a wide light distribution, the degree of freedom of arrangement of the blue light source is increased. For example, as shown in FIG. 9, due to the ease of wiring to the light source and restrictions on the arrangement of light sources of other colors, for example, a blue light source is arranged only at 2B, and another color is provided at the place where the remaining optical members are present. Even if the blue light source is localized so as to arrange the light source, it is possible to provide an illumination device that makes the entire illumination device shine neatly by the optical member 2 and that the entire color shines with the color unevenness suppressed.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Light source, 11 ... Light source substrate, 2 ... Optical member, 21 ... Output surface, 22 ... Incident surface, 23 ... Flat surface, 3 ... Power supply, 4 ... Housing | casing, 5 ... Sade

Claims (9)

In the optical member arranged to face the light source,
An optical member in which the exit surface of the optical member has a shape in which the curvature center C of the exit surface at a point P on the exit surface in a direction that makes an angle with the optical axis of the light source exists at a position off the optical axis. Because
An optical member having an incident surface of the optical member having a pair of shapes in the order of at least a concave surface and a convex surface in a direction in which the incident surface is angled with respect to the optical axis of the light source from the front side of the light source. In the optical member arranged to face the light source,
An optical member in which the exit surface of the optical member has a shape in which the curvature center C of the exit surface at a point P on the exit surface in a direction that makes an angle with the optical axis of the light source exists at a position off the optical axis. Because
The incident surface of the optical member has a shape in which a curvature of one or more pairs continuously changes in the order of at least a concave surface and a convex surface from the front side of the light source toward the direction that is angled with respect to the optical axis of the light source. Optical member. 3. The optical member according to claim 1, wherein the emission surface has a convex shape. 4. The optical member according to any one of claims 1 to 3,
An optical member characterized in that a light beam in a direction connecting a center of curvature of a convex surface provided on an incident surface from a light source is refracted on an output surface and an angle is opened with respect to an optical axis of the light source. An optical unit comprising the optical member according to any one of claims 1 to 4 and a light source. At least one optical unit in which the optical member according to any one of claims 1 to 4 and a light source are combined;
A housing,
A lighting device having a power source. The lighting device according to claim 6, wherein a plurality of optical members are integrated. The lighting device according to claim 6 or 7, wherein two or more types of light sources having different light emission characteristics are provided, and at least two or more optical members having different shapes are provided. The lighting device according to claim 8, wherein two or more types of light sources having different emission colors are provided, and one of the emission colors is blue.

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