TWI738393B - Lighting fixtures - Google Patents

Abstract

The present invention provides a lighting fixture 1 including: a light emitting module 20 having a plurality of LED light sources; a lens cover 30 having a plurality of lenses 31 for controlling the light distribution of the light rays respectively emitted from the LED light sources 22, covering the plurality of LED light sources 22 ; And the diffusion cover 40, covering the lens cover 30. In addition, the incident surface 131 of the lens 31 has: a first recess 141 that is recessed in the direction in which the light emitted from the LED light source 22 enters; The direction of the emitted light is concave. The second recess 142 has an inclined surface 142 b, and the inclined surface 142 b is inclined with respect to a surface perpendicular to the optical axis of the LED light source 22 along the direction of light emitted from the LED light source 22.

Description

Lighting fixtures

The present invention relates to a lighting appliance.

The conventional lighting fixture of Patent Document 1 includes a light source and a lens that diffuses light emitted from the light source. The lens is arranged to face the light source, and includes a curved portion having a concave portion recessed toward the light emission direction side of the light source; and a flat portion parallel to the substrate surface of the substrate on which the light source is provided. The distance a from the light source to the curved portion is greater than the distance b from the curved portion to the end of the curved portion on the opposite side of the light source. [Literature Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent No. 5897291

[Problems to be solved by the present invention]

In the case of the lens of the conventional lighting equipment, when a wide-angle light distribution is to be implemented, the distance between the light source and the curved part must be reduced. However, this lens, due to the limitation that the distance a is greater than the distance b, it is difficult to reduce the distance a, and it is difficult to implement a wide-angle light distribution.

In addition, when the position of the curved portion with respect to the light source is shifted, if the light emitted from the light source enters the flat portion, the lens may generate bright lines, resulting in uneven brightness and color unevenness.

Therefore, an object of the present invention is to provide a lighting fixture that can make the lens emit light with a wide-angle light distribution, and emit light with suppressed uneven brightness and color unevenness. [Technical means to solve the problem]

In order to achieve the above object, one aspect of the lighting fixture of the present invention includes: a light-emitting module having a plurality of LED (Light Emitting Diode, light-emitting diode) light sources; a lens cover having control to emit light from the plurality of LED light sources A plurality of lenses for the light distribution of the light, covering a plurality of the LED light sources; and a diffusion cover, which is translucent, covering the lens cover; the lens has an incident surface on which the light emitted from the LED light source enters, and The exit surface from which the light incident on the entrance surface exits; the entrance surface has: a first recess facing the LED light source and recessed toward the direction in which the light emitted from the LED light source is incident; and a second recess located at The outer periphery of the first recessed portion is recessed toward the direction in which the light emitted from the LED light source is incident; The direction of light emitted by the light source is inclined. [Effects of the invention]

According to the present invention, the lens can emit light with a wide-angle light distribution, and emit light with suppressed uneven brightness and color unevenness.

Hereinafter, the embodiments of the present invention will be described with reference to the drawings. The embodiments described below all show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, the arrangement positions and connection forms of the components, etc. shown in the following embodiments are only examples, and the gist does not limit the present invention. Therefore, among the constituent elements of the following embodiments, the constituent elements that are not described in the independent claims will be described as arbitrary constituent elements.

In addition, each figure is a schematic diagram and is not strictly an illustration. In addition, in each figure, the same code|symbol is attached|subjected to substantially the same structure, and the repeated description is abbreviate|omitted or simplified.

In addition, in the following embodiments, expressions such as slightly parallel are used. For example, slightly parallel means not only parallel but also substantially parallel, that is, for example, an error of several% is included. In addition, "a little parallel" means "parallel" in the range in which the effects of the present invention can be obtained. The performance of other uses of "略" is also the same.

In the following description, the direction parallel to the optical axis of the light emitted by the LED (Light Emitting Diode) light source is the Z-axis direction, and the direction perpendicular to the Z-axis direction is defined as the X-axis direction and the Y-axis direction.

Hereinafter, the lighting fixture according to the embodiment of the present invention will be described.

(Implementation form) [Constitution: Lighting Equipment 1] Fig. 1 is a perspective view showing the overall configuration of a lighting fixture 1 of the embodiment.

As shown in Fig. 1, the lighting fixture 1 is a lighting device that emits light that can illuminate the surroundings. Specifically, the luminaire 1 is, for example, a ceiling lamp, which is installed on the ceiling, wall, and other construction materials of facilities such as houses, and is used to illuminate the interior space of the facility. The lighting fixture 1 is fixed to the construction building material by the fixture installation member or the like. Building materials are components that make up ceilings, walls, etc.

The structure of the lighting fixture 1 will be described with reference to FIGS. 2 and 3. Fig. 2 is an exploded perspective view of the lighting fixture 1 according to the embodiment. FIG. 3 is a cross-sectional view showing a cross-section of the lighting fixture 1 of the embodiment along the line III-III in FIG. 1.

As shown in FIGS. 2 and 3, the lighting fixture 1 includes a housing 10, a light emitting module 20, a lens cover 30, and a diffusion cover 40.

＜Chassis 10＞ The housing 10 is formed, for example, by pressing sheet metal such as aluminum plate or steel plate. The housing 10 has a disc shape and is a storage body that houses the light-emitting module 20 and the lens cover 30. In this embodiment, when viewed from the Z-axis direction, a substantially circular opening 10a is formed in the center portion of the housing 10.

The opening 10a is provided with an appliance mounting member (not shown) for mounting the housing 10 on a suspended ceiling lamp holder (not shown). The appliance installation component can be fitted with the suspended ceiling lamp holder installed in the construction material in a manner that can be assembled and disassembled arbitrarily. In addition, the appliance mounting member is used to mount the housing 10 to the joint of the suspended ceiling lamp holder of the construction material in a arbitrarily detachable manner. That is, the opening 10a is formed at a position corresponding to the suspended ceiling lamp holder, and is a through hole for arranging the suspended ceiling lamp holder.

In addition, the suspended ceiling lamp holder is electrically connected to a commercial power source (not shown) via a wire (not shown). By attaching the lighting fixture 1 to the suspended ceiling lamp holder via the fixture mounting member, power is supplied to a power supply circuit (not shown) included in the lighting fixture 1. The power supply circuit is a circuit that generates power for causing the light-emitting module 20 to emit light, and converts AC power supplied through the appliance mounting member into DC power. By supplying the DC power to the light-emitting module 20, the light-emitting module 20 emits light. That is, the appliance installation member connects the lighting appliance 1 and the suspended ceiling lamp holder mechanically and electrically.

In addition, the housing 10 also functions as a heat sink for dissipating heat from the light-emitting module 20.

Furthermore, it is also possible to mount a cushioning member (not shown) formed of urethane or the like on the surface on the construction material side (the surface on the positive direction of the Z axis) of the housing 10. The buffer member is arranged along the shape of the housing 10. When the lighting fixture 1 is installed in a construction building material, by sandwiching the buffer member between the housing 10 and the construction building material, the swing or rotation of the housing 10 is suppressed.

＜Light-emitting module 20＞ The light-emitting module 20 is, for example, a module that emits light, and is a module for indoor lighting that brightens the entire room. The light-emitting module 20 is disposed on the surface on the negative Z-axis side of the bottom 11 of the housing 10, that is, the mounting surface, and is held in the housing 10 to irradiate light to the surroundings.

The light-emitting module 20 has a substrate 21 and a plurality of LED light sources 22.

The substrate 21 is an embedding substrate having an embedding surface for embedding the LED light source 22. The substrate 21 is formed of a plurality of pieces in a substantially circular ring shape. The plurality of substrates 21 are respectively fixed to the housing 10 by fixing members such as screws on the mounting surface on the negative Z-axis side of the bottom 11 of the housing 10 so as to surround the opening 10 a of the housing 10. Specifically, the substrate 21 is fixed to the housing 10 in such a manner that the mounting surface faces the negative direction of the Z-axis in a state of being slightly parallel to the X-Y plane. In this embodiment, three arc-shaped substrates 21 form a circular ring shape, but the number of substrates 21 is not limited to this form, and may be two or less, or four or more. The substrate 21 may be arranged in a ring shape so as to surround the opening 10a. That is, in this embodiment, a plurality of light-emitting modules 20 are installed in the housing 10.

As the substrate 21, for example, a metal base substrate obtained by providing an insulating film to a base material composed of a metal material such as aluminum or copper, a ceramic substrate made of a sintered body of a ceramic material such as alumina, or a resin substrate based on a resin material is used Wait. In this embodiment, as the substrate 21, a printed wiring board composed of a glass epoxy substrate on which metal wiring is formed is used. In addition, the substrate 21 may be a rigid substrate or a flexible substrate.

The plurality of LED light sources 22 are arranged in a substantially arc shape along the shape of the substrate 21. That is, since the plurality of substrates 21 are arranged in a ring shape, the plurality of LED light sources 22 are arranged in a plurality of circular ring-shaped rows according to the plurality of substrates 21, that is, concentrically arranged. In this embodiment, 7 rows are arranged in the radial direction. In addition, in FIG. 2, a plurality of LED light sources 22 are omitted from the illustration.

The plurality of LED light sources 22 are configured to emit white light, for example. Specifically, the plurality of LED light sources 22 are composed of COB (Chip On Board) type LED elements, and have a plurality of blue LEDs embedded in a bare chip (LED chip) on the substrate 21, and these blue LEDs. A sealing member for LED sealing, and the sealing member includes a yellow phosphor. In addition, a plurality of LED light sources 22 can also emit light of more than two colors. Specifically, the plurality of LED light sources 22 may also be three-color LED light sources of RGB, emitting red light, blue light, and green light, and emitting monochromatic light of the three colors, and emitting monochromatic light of these three colors for dimming Borrow to obtain colored light or white light.

In addition, the plurality of LED light sources 22 may also be surface mount devices (SMD: Surface Mount Device) type LED components in which LEDs are packaged, with a container (package), a plurality of LED chips embedded in the container, and A sealing member for sealing multiple LED chips. The sealing member is a transparent insulating resin material such as silicone resin. In addition, light diffusing materials such as silica and fillers can also be dispersed in the sealing member.

In this embodiment, a plurality of LED light sources 22 irradiate light in a direction slightly parallel to the negative direction of the Z-axis. Specifically, the optical axis of the plurality of LED light sources 22 is the main emission direction of light, which is a direction slightly parallel to the negative direction of the Z-axis.

The plurality of LED light sources 22 configured in this way are embedded in the substrate 21. In this embodiment, a plurality of substrates 21 are embedded in each of the three substrates 21.

＜Lens cover 30＞ 4 is a plan view showing the surface of the lens cover 30 of the lighting fixture 1 of the embodiment.

As shown in FIGS. 3 and 4, the lens cover 30 is an optical member for controlling the light distribution of the light from the plurality of LED light sources 22, respectively. The lens cover 30 is formed of a light-transmitting material (for example, transparent resin such as polymethylmethacrylate (PMMA), polycarbonate (PC), etc.).

The lens cover 30 is formed in an annular shape along the shape in which the plurality of substrates 21 are arranged. When viewing the lens cover 30 and the housing 10 from the positive direction of the Z axis, the opening 30 a of the lens cover 30 is approximately the same as the opening 10 a of the housing 10. That is, the center axis of the lens cover 30 passing through the center of the opening surface constituting the opening 30a is approximately the same as the center axis of the housing 10 passing through the center of the opening surface constituting the opening 10a.

Viewed from the positive direction of the Z axis, the lens cover 30 is arranged in the negative direction of the Z axis of the light emitting module 20 to cover the light emitting module 20. In addition, the lens cover 30 is fixed to the bottom 11 of the housing 10 via a substrate 21 by a fixing member such as screws. That is, the lens cover 30 is fixed to the housing 10 in a position slightly parallel to the X-Y plane, so as to cover the plurality of LED light sources 22 and the substrate 21.

In this embodiment, there is one lens cover 30, but it may be a lens cover 30 composed of a plurality of arcs in accordance with the substantially arc-shaped shape of the substrate 21. For example, it can also be provided so that three lens covers 30 cover the light-emitting module 20.

Fig. 5 is a cross-sectional view showing a cross section of the lens cover 30 of the lighting fixture 1 of the embodiment along the line V-V in Fig. 4.

As shown in FIGS. 4 and 5, the lens cover 30 has: a plurality of lenses 31 to control the light distribution of the light rays respectively emitted from the plurality of LED light sources 22; Extend sideways.

The plurality of lenses 31 cover the plurality of LED light sources 22 in a one-to-one correspondence with the plurality of LED light sources 22. That is, the lens 31 corresponds to the LED light source 22; the plurality of lenses 31 are arranged in a plurality of annular rows (hereinafter referred to as lens rows), that is, concentrically arranged. The lens row is a ring-shaped row with a plurality of lenses 31 as a group, and is arranged in the circumferential direction along the arrangement of the plurality of LED light sources 22.

A plurality of lenses 31 constituting the lens row are connected in the circumferential direction. Specifically, the lens 31 connects two lenses 31 adjacent in the circumferential direction in the circumferential direction. Using FIG. 6, the thickness of the lens 31 of the connecting portion 39a will be described. 6 is a cross-sectional view showing a cross-section of the lens cover 30 of the lighting fixture 1 of the embodiment along the VI-VI line in FIG. 4.

As shown in FIG. 6, the height of the connecting portion 39a (the thickness in the Z-axis direction) of the two lenses 31 adjacent in the circumferential direction is higher than the height of the outer peripheral edge of the non-connected portion 39b in the lens 31 (the thickness in the Z-axis direction) higher. That is, the thickness H2 of the connecting portion 39a of the two lenses 31 adjacent in the circumferential direction is thicker than the thickness H1 of the non-connecting portion 39b of the two lenses 31 adjacent in the radial direction.

In addition, in the plural lenses 31, the diameter a of the outermost periphery of the lens 31 and the distance b (also referred to as the pitch) between the central axes of the two adjacent lenses 31 satisfy 0.75<(b/a)< 1. The diameter a of the outermost periphery of the lens 31 refers to the diameter of a circular or arc-shaped lens 31 when the lens 31 is viewed from the Z-axis direction. Therefore, the two adjacent lenses 31 overlap at most about one-fourth of the diameter, and the outermost periphery of the lens 31 is at least in contact with each other.

The light emitted by each LED light source 22 is transmitted through a plurality of lenses 31, so the light distribution of the transmitted light is controlled and emitted.

7 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light rays emitted from the lens 31 of the lens cover 30 of the lighting fixture 1 of the embodiment. As shown in FIG. 7, a plurality of lenses 31 emit light having a light distribution peak toward the center portion of the diffuser 40. Therefore, a part of the lens 31 among the plurality of lenses 31 has different light distribution characteristics. That is, the light distribution characteristics of the lens 31 vary depending on the position in the lens cover 30.

As shown in FIGS. 3 and 7, for example, when viewed from the direction in which the lens cover 30 and the diffuser cover 40 overlap, among the plurality of lenses 31, one or more lenses 31 arranged on the center portion side of the diffuser cover 40 emit The light having a light distribution peak toward the center portion of the diffuser 40. Specifically, the lens row arranged near the opening 30 a of the lens cover 30, that is, on the inner edge side, emits light having a light distribution peak toward the center of the diffuser cover 40 from the exit surface 132. In addition, in a plurality of lens rows, the light distribution characteristic of a wide range of light distribution is obtained from the vicinity of the opening 30a of the lens cover 30, that is, the inner peripheral side toward the outer peripheral side. That is, in the present embodiment, as the lens row from the innermost circumference of the lens cover 30 moves toward the lens row at the outermost circumference, the light distribution characteristic gradually becomes a wide-range light distribution.

Each lens 31 is a lens 31 that emits light having two light distribution peaks. Specifically, each lens 31 is a lens 31 having a bat-wing-shaped light distribution characteristic, that is, there are two light distribution peaks on the opposite side to the optical axis. That is, the lens cover 30 is provided with a plurality of lenses 31 having a bat-wing-shaped light distribution characteristic, and performs light distribution control that expands the light distribution angle of the light emitted from the light emitting module 20.

In addition, the light distribution angle of each lens 31 as the light distribution peak may be determined, for example, according to the arrangement position of the LED light source 22 and the height of the diffusion cover 40 relative to the lens cover 30.

Among the plurality of lenses 31, the respective exit surfaces 132 of the plurality of lenses 31 constituting the lens row located at the outermost periphery of the lens cover 30 are continuous with the outer peripheral edge of the lens cover 30. Specifically, when the lens cover 30 is viewed from the positive direction of the Z axis, the outer peripheral edge of the lens 31 is inscribed with the outer peripheral edge of the lens cover 30. That is, between the outer peripheral edge of the lens 31 and the outer peripheral edge of the lens cover 30, the flange of the lens cover 30 is not formed.

As shown in FIG. 5, the plurality of lenses 31 respectively have an incident surface 131 on which the light emitted from the LED light source 22 enters, and an exit surface 132 on which the light incident on the incident surface 131 is emitted.

The incident surface 131 is a surface opposite to the light-emitting surface of the LED light source 22, and is a surface on which the light emitted by the LED light source 22 enters. The incident surface 131 is a surface on the positive Z-axis side of the lens 31, and is a surface on the opposite side to the output surface 132.

The incident surface 131 has a first recess 141 and a second recess 142.

The first recess 141 is recessed toward the direction in which the light rays emitted from the LED light source 22 are incident. That is, the first recess 141 is recessed in the direction away from the LED light source 22 (the negative direction of the Z-axis). The inner surface 141a of the first recess 141 constitutes a part of the incident surface 131 on which the light emitted by the LED light source 22 enters, and has a parabolic shape, a cone shape, a truncated cone shape, or the like.

When viewed from the direction in which the lens 31 and the LED light source 22 overlap (Z-axis direction), the LED light source 22 overlaps the first recess 141. That is, the first recess 141 is formed at a position opposite to the LED light source 22 and is located in the negative direction of the Z axis of the LED light source 22.

The second recess 142 is located on the outer periphery of the first recess 141 and is recessed toward the direction in which the light rays emitted from the LED light source 22 are incident. That is, the second recess 142 is recessed in a direction away from the LED light source 22 (the negative direction of the Z-axis). When the second recess 142 and the first recess 141 are observed, the second recess 142 is a concentric annular recess formed with respect to the first recess 141.

The inner surface of the second recess 142 constitutes a part of the incident surface 131 on which the light emitted from the LED light source 22 enters. In this embodiment, the concave shape of the second concave portion 142 is continuous with the concave shape of the first concave portion 141. That is, the first recess 141 is formed in the inside (bottom) of the second recess 142.

The second recess 142 has an inclined surface 142b and an opposite incident surface 142a.

The inclined surface 142b is inclined with respect to the surface (X-Y plane) perpendicular to the optical axis of the LED light source 22 along the direction of emission of the light rays emitted from the LED light source 22. Specifically, the inclined surface 142b is an annular surface inclined in a direction away from the LED light source 22 with respect to the X-Y plane. That is, the inclined surface 142b is a push-out surface. Therefore, the light emitted by the LED light source 22 is not easily incident on the inclined surface 142b.

In addition, if the angle of the inclined surface 142b with respect to the surface perpendicular to the optical axis (X-Y plane) of the inclined surface 142b is θ, 30°≧θ>5° is satisfied.

The opposing incident surface 142a is a surface facing the emission direction, and when the LED light source 22 and the lens 31 are viewed overlappingly, it is an annular surface surrounding the LED light source 22. In addition, the opposing incident surface 142a is a surface formed on the outer peripheral edge side of the inclined surface 142b. The opposite incident surface 142a constitutes a part of the incident surface 131 into which the light emitted by the LED light source 22 enters. In this embodiment, the opposing incident surface 142a is a surface inclined to the Z-axis direction, but it may be a surface that is slightly parallel to the Z-axis direction.

The surface of the first connecting portion 142d connecting the opposite incident surface 142a and the inclined surface 142b is a curved surface in the shape of an arc in a cross-sectional view. The first connecting portion 142d has an annular shape.

The surface of the second connecting portion 142c of the first recess 141 and the second recess 142 is an arc-shaped curved surface in a cross-sectional view. That is, the arc-shaped curved surface is a surface that connects the inner surface 141 a of the first recess 141 and the inclined surface 142 b of the second recess 142. The second connecting portion 142c is a circular protrusion. The second connecting portion 142c is arranged on the negative side of the Z-axis than the imaginary surface extending the light-emitting surface of the LED light source 22. That is, the second connection portion 142c does not surround the LED light source 22.

In addition, the distance from the imaginary surface to the surface of the second connecting portion 142c from the second connecting portion 142c is about 1 mm or less.

As described above, in this embodiment, the light distribution characteristics of a part of the plurality of lenses 31 are different. This is achieved by changing the depth of the first recess 141 and the second recess 142. For example, the depths of the first concave portion 141 and the second concave portion 142 increase from the innermost lens row in the lens cover 30 toward the outermost lens row.

At least one of the surface of the first connection portion 142d, the surface of the second connection portion 142c, the inclined surface 142b, and the opposite incident surface 142a is a rough surface that diffuses light. In this embodiment, the surface of the first connecting portion 142d, the surface of the second connecting portion 142c, the inclined surface 142b, and the opposite incident surface 142a are rough surfaces that diffuse light. The inner surface 141a of the first recess 141 is not a rough surface. The rough surface is configured to have light diffusibility by performing diffusion processing. For example, the rough surface may be fine irregularities formed by surface treatment such as surface embossing. In addition, in order to improve the light diffusibility, a rough surface may be further included in the light diffusing material.

The exit surface 132 is a surface on which the light emitted from the LED light source 22 and transmitted through the interior is emitted. The exit surface 132 is the surface of the lens 31 on the negative side of the Z axis.

The exit surface 132 is formed with a concave portion 132a in which the central axis of the lens 31 (line approximately coincident with the optical axis of the light source) is recessed in the positive direction of the Z axis, so as to suppress the emission of light rays slightly parallel to the Z axis direction from the lens 31. The concave portion 132a is a substantially conical concave portion; the portion approximately coincident with the central axis of the lens 31 approximately coincides with the bottom end of the concave portion 132a.

The exit surface 132 has a circular shape when viewed from the positive direction side of the Z axis. In addition, since the two adjacent lenses 31 are connected in the circumferential direction, the two adjacent lenses 31 are connected so that the exit surfaces 132 of the two adjacent lenses 31 are continuous. In other words, the lens row constitutes an annular exit surface 132.

In addition, the exit surface 132 may be formed with fine unevenness (surface embossing) by surface embossing or the like.

The extension portion 30c is formed on the inner peripheral side of the lens cover 30 and extends (projects) from the position where the plurality of lenses 31 are arranged toward the central axis side. That is, the extension portion 30c extends toward the central axis side to narrow the opening 30a (to reduce the opening area of the opening 30a). The extension portion 30c is a plate-shaped portion that is slightly parallel to the X-Y plane, and is fan-shaped when viewed from above. In this embodiment, two extensions 30c are provided at the target positions, but there may be one, or three or more.

＜Diffusion mask 40＞ The diffusion cover 40 is an optical member that covers the lens cover 30 and diffuses the light incident from the lens cover 30 to the outside and emits it. The diffuser cover 40 is supported by the housing 10 in a state of being separated from the lens cover 30 by a predetermined distance. Specifically, the diffuser cover 40 has a circular shape when viewed from the Z-axis direction, and is supported by the housing 10 so that the central axis thereof approximately coincides with the opening 30a of the lens cover 30 and the opening 10a of the housing 10.

The diffuser 40 has light transmittance. For example, the diffusion cover 40 is formed of a light-transmitting material such as polymethyl methacrylate resin. For example, as for the diffuser 40, a milky white diffuser in which the light diffuser is dispersed can also be used. In addition, on the surface of the diffuser cover 40, fine unevenness (surface embossing) may be formed by surface embossing or the like. In this way, the light incident from the lens cover 30 to the diffuser cover 40 is transmitted through the diffuser cover 40 to be scattered. Thereby, the unevenness of brightness exhibited in the diffuser 40 when the diffuser 40 is viewed from the negative direction of the Z-axis can be reduced.

[Operation] When the LED light source 22 emits light from these lighting fixtures 1, almost all of them enter the inner surface 141a of the first recess 141 of the lens 31. The light incident on the inner surface 141a of the first recess 141 passes through the lens 31 and exits from the exit surface 132 corresponding to the incident first recess 141. In addition, a part of the light emitted by the LED light source 22 enters the opposite incident surface 142 a of the second recess 142. The light incident on the opposite incident surface 142 a of the second concave portion 142 is directed toward the adjacent lens 31 and exits from the exit surface 132 of the lens 31.

These light rays are emitted from the lens cover 30 having a plurality of lenses 31 and enter the diffuser cover 40. The light incident to the diffuser 40 diffuses when passing through the diffuser 40 and exits from the diffuser 40 to illuminate the surroundings.

These light rays are emitted from the lens cover 30 having a plurality of lenses 31. Each lens 31 has a light distribution characteristic toward the center of the diffuser 40. Therefore, in the lighting fixture 1 of this embodiment in which the LED light source 22 is not arranged in the center, the center of the diffuser 40 is not easily darkened.

[Effect] Next, the effect of the lighting fixture 1 in this embodiment will be described.

As described above, the lighting fixture 1 of this embodiment includes: a light emitting module 20 having a plurality of LED (Light Emitting Diode, light emitting diode) light sources; a lens cover 30 having control of light emitted from the plurality of LED light sources 22 A plurality of lenses 31 for the light distribution cover a plurality of LED light sources 22; and a diffuser cover 40, which is transparent, covers the lens cover 30. In addition, the lens 31 has an incident surface 131 on which the light emitted from the LED light source 22 enters, and an exit surface 132 on which the light incident on the incident surface 131 is emitted. In addition, the incident surface 131 has: a first recess 141 facing the LED light source 22 and recessed in the direction in which the light emitted from the LED light source 22 enters; and a second recess 142 located on the outer periphery of the first recess 141 and facing The direction in which the light emitted from the LED light source 22 is incident is concave. The second concave portion 142 has an inclined surface 142 b, and the inclined surface 142 b is inclined with respect to a surface perpendicular to the optical axis of the LED light source 22 along the direction of light emitted from the LED light source 22.

In this way, the light emitted by the LED light source 22 enters the inner surface 141 a (a part of the incident surface 131) of the first concave portion 141 of the lens 31. The first concave portion 141 is recessed in the negative direction of the Z-axis, so when incident on the inner surface 141a of the first concave portion 141, it refracts and faces a direction in which the angle with respect to the optical axis of the LED light source 22 becomes larger. Therefore, the light emitted from the exit surface 132 of the lens 31 is distributed at a wide angle.

In addition, the inclined surface 142b is inclined along the emission direction of the light emitted from the LED light source 22, so the light emitted from the LED light source 22 is not likely to be directly incident on the inclined surface 142b. Therefore, even if the position of the LED light source 22 is shifted to the lens 31, the light that becomes a bright line is not easy to enter the inclined surface 142b from the LED light source 22.

Therefore, in this lighting fixture 1, the lens 31 can emit light with a wide-angle light distribution, and emit light with suppressed brightness unevenness and color unevenness.

Especially, in the conventional lens, if the thickness of the lens is reduced, the bright lines may be obvious, so it is not easy to reduce the thickness of the lens. However, in the lighting fixture 1 of the present embodiment, even if the thickness of the lens 31 is reduced, it is still difficult to make bright lines conspicuous. Therefore, the thickness of the lens cover 30 can be reduced.

In addition, in the lighting fixture 1 of the present embodiment, if the angle of the inclined surface 142b with respect to the surface perpendicular to the optical axis is θ, 30°≧θ>5° is satisfied.

For example, if θ is 5° or less, the light emitted from the LED light source 22 is likely to be incident on the inclined surface 142b of the second recess 142. Therefore, the light incident on the inclined surface 142b may emit bright lines from the lens 31. The resulting uneven brightness and uneven color light conditions. In addition, if θ is greater than 30°, the depth of the second concave portion 142 increases, which hinders the light incident on the inner surface 141a of the first concave portion 141, and sometimes blocks the light that is distributed at a wide angle.

However, according to the present embodiment, it is possible to more reliably cause the lens 31 to emit light with a wide-angle light distribution, and to emit light with more suppressed brightness unevenness and color unevenness.

Moreover, in the lighting fixture 1 of this embodiment, the surface of the 2nd connection part 142c (an example of a connection part) of the 1st recessed part 141 and the 2nd recessed part 142 is a curved surface.

For example, if the second connecting portion 142c of the first recessed portion 141 and the second recessed portion 142 is sharp, the light incident on the tip of the recessed portion 142 may become a bright line, and the light emitted from the lens cover 30 may have uneven brightness and color unevenness. all.

However, according to the present embodiment, by making the surface of the second connecting portion 142c a curved surface, the light incident on the surface of the second connecting portion 142c is less likely to become a bright line. Therefore, this luminaire 1 can emit light whose brightness unevenness and color unevenness are more suppressed.

In addition, in the lighting fixture 1 of the present embodiment, at least one of the surface of the first connecting portion 142d (an example of the connecting portion) and the second concave portion 142 has a rough surface that diffuses light.

According to this method, even if light enters the surface of the first connection portion 142d and the second recess 142, the light still diffuses, and it becomes difficult to generate bright lines. Therefore, this luminaire 1 can emit light whose brightness unevenness and color unevenness are more suppressed.

In addition, in the lighting fixture 1 of the present embodiment, the lens 31 emits light having a light distribution peak toward the center portion of the diffuser 40.

In this way, even for the lighting fixture 1 in which the LED light source 22 cannot be arranged in the central part of the lighting fixture 1, the lens 31 still emits light toward the central part of the diffuser cover 40, so it is not easy for the part where the LED light source 22 is not arranged to pass through the diffuser cover 40 It looks gloomy. Therefore, this lighting fixture 1 can emit light with high uniformity from the lighting fixture 1.

In addition, in the lighting fixture 1 of this embodiment, when viewed from the direction in which the lens cover 30 and the diffuser cover 40 overlap the lens cover 30 and the diffuser cover 40, among the plurality of lenses 31, one or more lenses 31 arranged on the central portion side of the diffuser cover 40 emits Light having a light distribution peak toward the center of the diffuser 40.

In this way, the part where the LED light source 22 is not arranged is not easy to look dark through the diffuser 40. That is, the part where the LED light source 22 is not arranged looks bright. Therefore, the lighting fixture 1 can emit light with higher uniformity from the lighting fixture 1.

In addition, in the lighting fixture 1 of this embodiment, the exit surface 132 is circular in plan view. The two adjacent lenses 31 are connected in such a way that the exit surfaces 132 of the two adjacent lenses 31 are continuous.

In this way, the continuous portion of the exit surface 132, that is, the connecting portion 39a of the two adjacent lenses 31, has a larger thickness than the unconnected portion of the two adjacent lenses 31. Therefore, the strength of the lens cover 30 can be ensured. For example, it is possible to suppress warpage of the lens cover 30 when the lens cover 30 is molded.

In addition, in the lighting fixture 1 of this embodiment, the diameter a of the outermost periphery of the lens 31 and the distance b between the central axes of two adjacent lenses 31 satisfy 0.75<(b/a)<1.

In this way, the two adjacent lenses 31 are connected to the extent that the area of the exit surface 132 of each lens 31 does not become too small, so the strength of the lens cover 30 can be ensured, and the lens 31 can emit a wide-angle light distribution. Light.

In addition, in the lighting fixture 1 of this embodiment, a plurality of LED light sources 22 are arranged in a plurality of annular rows. The plurality of lenses 31 are arranged in the circumferential direction along the arrangement of the plurality of LED light sources 22.

For example, in the case of using a lens 31 having a bat-wing light distribution characteristic, if a plurality of lenses 31 are connected in the radial direction, even if the light distribution peak of each lens 31 is directed toward the center part of the diffuser 40, it is still difficult to be sufficient. The amount of light emitted from each lens 31 is ensured. This is because the connecting portions 39a of the two adjacent lenses 31 are aligned in the radial direction, so the light distribution peaks of the lenses 31 are directed toward the central portion of the diffuser 40 and the respective areas of the exit surfaces 132 are reduced. Part of the amount. Therefore, the inventor believes that the amount of light emitted from the lens cover 30 is reduced.

However, according to this embodiment, the amount of light emitted from each lens 31 can be surely ensured.

In addition, in the lighting fixture 1 of this embodiment, the exit surface 132 of the lens 31 located at the outermost periphery of the lens cover 30 among the plurality of lenses 31 is continuous with the outer peripheral edge of the lens cover 30.

In this way, the exit surface 132 of each lens 31 located at the outermost periphery of the lens cover 30 continues to the outer peripheral edge of the lens cover 30, so the area of the exit surface 132 of the lens 31 can be increased to the limit. Therefore, the amount of light emitted from the lens cover 30 can be ensured.

In addition, in the lighting fixture 1 of the present embodiment, the second concave portion 142 further has an opposite incident surface 142a facing the emission direction.

In this way, the light from the LED light source 22 is directly incident on the opposite incident surface 142a, so bright lines are not easily generated. Therefore, this luminaire 1 can emit light whose brightness unevenness and color unevenness are more suppressed.

In addition, in the lighting fixture 1 of this embodiment, the lens cover 30 is formed with an opening 30a. On the other hand, the lens cover 30 has an extension portion 30c extending so as to narrow the opening 30a.

For example, depending on the type of lighting equipment, a cable or the like for supplying power to the lighting equipment may be arranged near the opening. In this case, if the cable is large and hangs down, it may protrude from the opening and may become a shadow when viewing the lighting equipment. That is, the cable may be visually recognized through the diffuser cover 40, and the aesthetics of the lighting fixture may be impaired.

However, according to the present embodiment, even if the cables hang down due to the arrangement of these cables and the like near the opening 30a, the extension part 30c can still support the cables because the extension part 30c is in contact with the hanging cable. That is, the extension portion 30c can prevent the cable from contacting or approaching the diffusion cover 40. Therefore, it is possible to suppress defects such as cables from being visually recognized. As a result, this lighting fixture 1 is less likely to deteriorate in appearance.

(Other modifications) As mentioned above, although the lighting fixture of this invention was demonstrated based on embodiment, this invention is not limited to the above-mentioned each embodiment.

For example, in the lighting equipment of each of the above-mentioned embodiments, a flange portion may be formed in the lens cover. That is, it is also possible to form a flange part extending further in the radial direction from the outermost lens row of the lens cover among the plurality of lenses.

In addition, in the lighting fixtures of the above embodiments, the diameter of the respective lens rows of the lens cover may be slightly the same; the diameter of the outermost lens row of the lens cover may also be larger than the diameter of other lens rows.

In addition, in the lighting equipment of each of the above-mentioned embodiments, as shown in FIG. FIG. 8 is a cross-sectional view showing a cross-section of a lighting fixture 1 according to another modified example. Specifically, the diffuser cover has a dome portion 241 that is circular in plan view, and an inclined surface portion 242 that forms an outer peripheral portion of the dome portion 241. The dome 241 coincides with the lens cover when viewed from the Z-axis direction. The dome 241 is arranged at a predetermined distance away from the lens cover. The inclined surface portion 242 has an annular shape connected to the dome 241 in a plan view, and constitutes a push-out surface. The inclined surface portion 242 is arranged to surround the periphery of the lens cover 30 when viewed from the Z-axis direction. According to this method, compared to the case where the inclined surface portion 242 is replaced by a vertical side wall or the like, the light emitted from the lens cover 30 passes through the inclined surface portion 242 and is easily diffused and emitted. Therefore, the brightness of the outer peripheral part of the lighting fixture 1 can be made brighter.

In addition, the above-mentioned embodiments can be obtained by implementing various modifications that those having ordinary knowledge in the technical field can think of, and the constituent elements and functions of each embodiment can be arbitrarily combined without departing from the scope of the present invention. The implementation forms are all included in the present invention.

1: lighting fixtures 10: Chassis 10a: opening 11: bottom 20: Light-emitting module 21: substrate 22: LED (Light Emitting Diode, light-emitting diode) light source 30: lens cover 30a: opening 30c: Extension 31: lens 39a: Connection part 39b: Non-connected part 40,240: diffuser 131: incident surface 132: exit surface 132a: recess 141: The first recess 141a: Inside 142: The second recess 142a: Opposite incident surface 142b: Inclined surface 142c: 2nd connection part (connection part) 142d: 1st connection part (connection part) 241: round top 242: Oblique face H1, H2: thickness

Fig. 1 is a perspective view showing the overall configuration of the lighting fixture of the embodiment. Fig. 2 is an exploded perspective view of the lighting fixture of the embodiment. Fig. 3 is a cross-sectional view showing a cross-section of the lighting fixture of the embodiment along the line III-III in Fig. 1. Fig. 4 is a plan view showing the surface of the lens cover of the lighting fixture of the embodiment. Fig. 5 is a cross-sectional view showing a cross-section of the lens cover of the lighting device of the embodiment along the line V-V in Fig. 4. Fig. 6 is a cross-sectional view showing a cross-section of the lens cover of the lighting apparatus of the embodiment taken along the line VI-VI in Fig. 4. Fig. 7 is a schematic cross-sectional view illustrating the light distribution characteristics and light distribution peaks of the light rays emitted from the lens of the lens cover of the luminaire of the embodiment. Fig. 8 is a cross-sectional view showing a cross-section of a lighting fixture according to another modified example.

21: substrate

22: LED (Light Emitting Diode, light-emitting diode) light source

30: lens cover

31: lens

131: incident surface

132: exit surface

132a: recess

141: The first recess

141a: Inside

142: The second recess

142a: Opposite incident surface

142b: Inclined surface

142c: 2nd connection part (connection part)

142d: 1st connection part (connection part)

Claims (11)

A lighting fixture comprising: a light emitting module with a plurality of LED (Light Emitting Diode) light sources; a lens cover with a plurality of lenses for controlling the light distribution of the light emitted from the plurality of LED light sources, respectively , Covering a plurality of the LED light sources; and a diffusion cover, which is translucent, covering the lens cover; the lens has an incident surface on which light emitted from the LED light source is incident, and light rays that will be incident on the incident surface The exit surface of the emission; the incident surface includes: a first recess facing the LED light source and recessed toward the direction in which the light emitted from the LED light source is incident; and a second recess located on the outer periphery of the first recess, It is recessed toward the direction in which the light emitted from the LED light source is incident; the second recess has an inclined surface, the inclined surface relative to the surface perpendicular to the optical axis of the LED light source, along the direction of the light emitted from the LED light source And oblique; a plurality of the lenses are arranged in a manner to form a plurality of lens rows; a plurality of the lens rows are arranged along the arrangement of a plurality of the LED light sources; a plurality of the lenses constituting each row of the lens row , Is connected in such a way that the exit surfaces of the two adjacent lenses are continuous; the diameter a of the outermost periphery of the lens and the distance b between the central axes of the two adjacent lenses satisfy 0.75< (b/a)<1. Such as the lighting appliance in item 1 of the request, in which, If the angle of the inclined surface with respect to the surface perpendicular to the optical axis is θ, 30°≧θ>5° is satisfied. The lighting appliance of claim 2, wherein the surface of the connecting portion of the first recess and the second recess is a curved surface. The lighting fixture of claim 3, wherein at least one of the surface of the connecting portion and the second recess has a rough surface that diffuses light. The lighting fixture according to any one of claims 1 to 4, wherein the lens emits light having a light distribution peak toward the central part of the diffuser. The lighting fixture of claim 5, wherein, when viewed from the direction in which the lens cover and the diffuser cover overlap, among the plurality of lenses, one or more lenses arranged on the side of the central portion of the diffuser cover emit Light with a light distribution peak toward the center of the diffuser. Such as the lighting appliance of any one of claims 1 to 4, wherein the exit surface is circular when viewed from above. Such as the lighting fixture of any one of claims 1 to 4, wherein a plurality of the LED light sources are arranged in a manner of forming a plurality of circular rows; a plurality of the lenses are arranged along the plurality of the LED light sources The arrangement is arranged in the circumferential direction. Such as the lighting fixture in item 8 of the request, in which, The exit surface of the lens located at the outermost periphery of the lens cover among the plurality of lenses is continuous with the outer peripheral edge of the lens cover. The lighting fixture according to any one of claims 1 to 4, wherein the second recess further has an opposite incident surface opposite to the exit direction. The lighting appliance according to any one of claims 1 to 4, wherein the lens cover is formed with an opening; and has an extension part that protrudes so as to narrow the opening.

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