JP2014154461A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture in which an optical member for controlling light distribution of the light from an LED is made to correspond to the change in the preset number of Tatami mats, and whose appearance is satisfactory as illuminance unevenness hardly occurs.SOLUTION: A lighting fixture 1 comprises: a fixture body 2; LED groups 3a to 3c configured by arranging a plurality of LEDs 3 in an annular manner; and an optical member 4 for controlling light distribution of the light emitted from the LEDs 3. The LED groups 3a to 3c are provided concentrically with a central part of the fixture body 2 being the center. The optical member 4 has gutter-shaped lenses 4a for covering the LEDs 3 configuring the LED groups 3a and 3b collectively, and a plurality of single lenses 4b for individually covering each of the LEDs 3 configuring one of the LED groups 3c, and these are provided selectively by the unit of row of the LED groups. In this configuration, in the LED groups where the gutter-shaped lenses 4a are provided, the number of the LEDs 3 can be changed so that they can correspond to the change in the preset number of Tatami mats. Also, in the LED group where the single lenses 4b are provided, illuminance unevenness hardly occurs and the appearance becomes satisfactory.

Description

  The present invention relates to a luminaire using a light emitting diode (LED) as a light source.

  Light-emitting diodes (hereinafter referred to as LEDs) are attracting attention as light sources for lighting fixtures that can replace incandescent lamps and fluorescent lamps because they can emit light with high luminance at low power and have a long lifetime. As a lighting fixture using an LED as a light source, for example, a ceiling light attached to a ceiling or the like is widely used. In such a ceiling light, instead of a conventional annular fluorescent lamp, a plurality of LEDs are arranged in an annular shape, and the lighting state and illumination range of illumination light can be varied by appropriately controlling the lighting state of each LED. can do.

  However, since the LED has a strong directivity of the emitted light, when the LED is used as a light source for a ceiling light, the graininess is noticeable and the luminance tends to be uneven. Then, the lighting fixture using the optical member which diffuses the emitted light from LED in the wide range is known (for example, refer patent document 1). In general, an LED has a lower luminous flux than a fluorescent lamp, and therefore, a plurality of LEDs are used as a light source for a lighting fixture. For example, in the lighting fixture described in Patent Document 1, LED groups formed by arranging a plurality of LEDs in a ring shape are arranged in two rows concentrically.

  Moreover, the bowl-shaped lens which covers several LED contained in one LED group collectively for the optical member of the said lighting fixture is used. In general, in a ceiling light using LEDs as a light source, the light quantity is set by changing the number of LEDs according to the set number of tatami mats (the size of a room in which a lighting fixture is installed). In the ceiling light using the LED group as described above, the amount of light corresponding to the number of tatami mats used is set by changing the number of LEDs included in one LED group without changing the number of columns of the LED group. can do. Moreover, since it has a bowl shape with the optical member, even if the number of LEDs changes, the bowl shape lens having the same shape can be used, and the yield can be improved by sharing the members.

JP 2012-104476 A

  However, the saddle-shaped lens used in the lighting fixture described in Patent Document 1 can control the light distribution in the cross section in the radial direction from the fixture center, but controls the light distribution in the cross section in the direction orthogonal to the radial direction. Can not. Therefore, for example, when the number of LEDs included in one LED group is small and the interval between the LEDs is wide, the light emitted in the direction along the ring is not subjected to light distribution control at a wide angle, and the bowl-shaped lens There is a possibility that unevenness in illuminance may occur on the irradiated surface due to the light emitted from.

  The present invention solves the above-described problem, and can use an optical member that controls light distribution from an LED in accordance with a change in the number of set tatami mats, and it is difficult to cause uneven illumination and has a good appearance. The purpose is to provide.

  In order to solve the above-mentioned problems, the present invention provides an instrument body, an LED group in which a plurality of LEDs are arranged in an annular shape on the instrument body, and light emitted from the LEDs provided in the light emission direction of the LEDs. The LED group is provided in a plurality of concentric circles centering on the central portion of the instrument body, and the optical member includes a plurality of LEDs constituting one LED group. A bowl-shaped lens that collectively covers the LEDs, and a plurality of single lenses that individually cover the plurality of LEDs that constitute one LED group, and the bowl-shaped lens and the plurality of single lenses are the LEDs It is characterized by being provided selectively in units of columns with respect to the group.

  In the lighting apparatus, the optical member is preferably formed so as to distribute light emitted from the LED at a wide angle.

  In the lighting apparatus, the LED group is provided in three or more rows, and the bowl-shaped lens is provided in either the innermost LED group or the outermost LED group. Preferably it is.

  In the above luminaire, it is preferable that the single lens is provided in an outermost LED group among the plurality of LED groups.

  In the lighting apparatus, the bowl-shaped lens is provided in an innermost LED group among the plurality of LED groups, and a shape of an emission surface of the bowl-shaped lens is more than the optical axis direction of the LED. It is preferable that a cross-sectional shape in the inner peripheral direction of the instrument body is configured to be a convex shape in the inner peripheral direction.

  According to the present invention, since the number of LEDs can be changed in an LED group provided with a bowl-shaped lens as an optical member, it is possible to correspond to a change in the set tatami mat number, and in an LED group provided with a single lens, Since uneven illumination is less likely to occur, the appearance can be improved.

The disassembled perspective view of the lighting fixture which concerns on one Embodiment of this invention. The sectional side view of a part of the lighting apparatus. (A) is a front view which shows an example of the optical member used for the lighting fixture, (b) is a front view which shows the other example of the optical member. FIG. 4 is a cross-sectional view corresponding to any of AA, BB, CC, and C′-C ′ lines in FIG. The figure which shows the light distribution curve in the said cross section. (A) is a front view which shows an example of arrangement | positioning of LED used for the same lighting fixture, (b) is a front view which shows the other example of arrangement | positioning of the LED. The sectional side view of the optical member in the lighting fixture which concerns on the modification of the said embodiment. The figure which shows the light distribution curve in the said cross section. The sectional side view of a part of the lighting apparatus.

  A lighting apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 and FIG. 2, a lighting fixture 1 of the present embodiment includes a fixture main body 2 and a plurality of solid state light emitting elements (hereinafter referred to as LEDs) 3 arranged in an annular shape around the central portion of the fixture main body 2. And an optical member 4 provided in the light emitting direction of the LED 3 and controlling the light distribution of the light emitted from the LED 3. The luminaire 1 includes a diffusing member (cover) 5 that is provided in the light emitting direction from the optical member 4 and diffuses and emits light emitted from the optical member 4. In the present embodiment, LED groups 3a, 3b, 3c formed by annularly arranging a plurality of LEDs 3 are arranged in three rows concentrically. The lighting fixture 1 is suitably used as a ceiling light attached to a ceiling or the like as a residential lighting fixture.

  The instrument body 2 is a disk-shaped structural member, and the LED 3 and the like are arranged on the surface opposite to the construction surface such as a ceiling. In the central part of the instrument main body 2, a power feeding unit (not shown) fixed to a power feeding connector or the like provided on the construction surface is provided. In addition, a lighting circuit (not shown) for lighting and driving the LED 3 and a substrate 21 on which the LED 3 is mounted are provided on the outer peripheral side of the power feeding unit. The instrument body 2 is formed by pressing and cutting a plate material such as an aluminum plate or a steel plate having a predetermined rigidity into the above shape, and a white paint having a high visible light reflectivity on a surface on which an LED or the like is disposed. However, a coated or reflective metal material may be deposited.

  The power supply unit is a general-purpose adapter guide, and is connected to a commercial AC power supply via a power supply connector or the like. The lighting circuit includes a transformer, a capacitor, a control IC, and the like for converting and rectifying the alternating current supplied from the power supply unit into a direct current having a predetermined voltage suitable for the LED 3.

  The substrate 21 is configured by a rigid substrate, a flexible substrate, or a rigid flexible substrate. In the case of a ridged substrate, paper phenol, paper epoxy, glass composite, glass epoxy, Teflon (registered trademark), alumina, low-temperature co-fired ceramic, composite, or halogen-free is used as the material. In the case of a flexible substrate, polyimide or polyester is used as the material. A predetermined wiring pattern is formed on the surface on which the LED 3 is mounted on the substrate 21 formed of such a material. The lighting circuit is configured such that each of the LED groups 3a to 3c can be turned on independently based on a user operation. In addition, each LED3 in each LED group 3a-3c may be comprised so that further partial partial lighting or thinning-out lighting etc. are possible by grouping individually or plurally.

  The LED 3 is configured as an LED package by covering with a wavelength conversion member that converts the wavelength of light emitted from the LED chip. For example, a GaN-based blue LED chip that emits blue light is used as the LED chip, and the wavelength conversion member can emit light of daylight white or light bulb color to the translucent resin material for sealing. For this purpose, a phosphor mixed with the phosphor is used.

  The optical member 4 includes a bowl-shaped lens 4a that collectively covers a plurality of LEDs 3 constituting one LED group 3a and 3b, and a plurality of single lenses 4b that individually cover a plurality of LEDs 3 that constitute one LED group 3c. And having. In the present embodiment, the bowl-shaped lens 4 a and the plurality of single lenses 4 b are connected to each other by a base 40 for fixing the optical member 4 to the instrument body 2. The base 40, the bowl-shaped lens 4a, and the single lens 4b are integrally formed by injection molding using a translucent material such as acrylic resin or polycarbonate resin as a base material.

  The cover 5 has a dome shape that covers the front surface of the instrument body 2 and is formed of a resin material obtained by adding light diffusing particles or pigments to a light transmissive material such as an acrylic resin, a polycarbonate resin, or a cycloolefin resin. . The cover 5 is obtained by subjecting the surface or back surface of a transparent glass plate or resin plate to a rough surface by applying a sandblasting treatment or a textured surface, instead of adding the above light diffusing particles or pigments. Etc.

  The bowl-shaped lens 4a and the plurality of single lenses 4b are selectively provided in units of columns with respect to the LED groups 3a to 3c. Specifically, as shown in FIGS. 3A and 3B, a bowl-shaped lens 4a is provided in the LED group 3b sandwiched between the innermost LED group 3a and the outermost LED group 3c. A plurality of single lenses 4b are provided on the outermost LED group 3c. The innermost LED group 3a may be provided with a bowl-shaped lens 4a as shown in FIG. 3 (a), or a plurality of single lenses as shown in FIG. 3 (b). 4b may be provided.

  Each of the bowl-shaped lens 4a and the plurality of single lenses 4b is formed so as to distribute light emitted from the LED 3 at a wide angle. The saddle-shaped lens 4a can control the light distribution in the cross section in the radial direction from the center of the instrument (the AA cross section and the BB cross section in FIG. 3A), but in the cross section in the direction orthogonal to the radial direction. The light distribution cannot be controlled. On the other hand, the single lens 4b is a circular lens in a top view, and not only a cross section in the radial direction from the center of the instrument (C-C cross section in FIG. 3A) but also a cross section in a direction orthogonal to the radial direction (see FIG. The light distribution in the 3 (a) C′-C ′ cross section) can be controlled to a wide angle. The AA, BB, CC, and C′-C ′ line cross-sections of the bowl-shaped lens 4a and the single lens 4b are substantially the same, and the shapes are shown in FIG. Shown in In the cross section, the bowl-shaped lens 4a and the single lens 4b cover the light emitting portion of the LED 3, and have a dome-shaped incident surface 41 on which light emitted from the LED 3 enters, and a medium portion 42 on which light incident from the incident surface 41 propagates. And an emission surface 43 from which the light propagated through the medium part 42 is emitted.

  The emission surface 43 is formed so that the periphery of the LED 3 in the direction of the optical axis L (normal line passing through the center of the light emitting surface) is concave, and the periphery thereof is convex. According to this shape, the concave portion of the emission surface 43 is refracted so that the light diffuses in the outer peripheral direction, and the convex portion of the emission surface 43 is refracted so as to collect the light. As a result, as shown in FIG. 5, the light emitted from the bowl-shaped lens 4a and the single lens 4b shows a so-called badwing type light distribution curve. Thus, the bowl-shaped lens 4a and the single lens 4b can distribute the light emitted from the LED 3 in a wide angle.

  As described above, the luminaire 1 is preferably used as a ceiling light. Such ceiling lights, for example, are being developed with different number of tatami mats such as for 6 tatami mats to 14 tatami mats while sharing the members, and the luminous flux is set by changing the number of LEDs as light sources doing. In the luminaire 1, by changing the number of LEDs of the central LED group 3b among the three rows of LED groups 3a to 3c, for example, the configuration shown in FIG. The configuration shown in b) corresponds to different set tatami numbers, such as for 8 tatami mats. At this time, as shown in FIGS. 3 (a) and 3 (b), the LED group 3b uses a bowl-shaped lens 4a, so the optical member 4 of the same shape can handle any set number of tatami mats. The yield can be improved by sharing the members.

  Further, the LED group 3c on the outermost side among the LED groups 3a to 3c in the three rows has a long circumference and the arrangement interval of the LEDs 3 tends to be wide. Therefore, the LED group 3c is provided with a plurality of single lenses 4b instead of the bowl-shaped lens 4a. In this way, the light emitted in the direction along the ring of the LED group 3c is also controlled to be distributed at a wide angle, so that unevenness in illuminance occurs on the irradiated surface by the emitted light compared to the case where the bowl-shaped lens 4a is provided. It is difficult to improve the appearance when the lighting apparatus 1 is turned on. Of the three LED groups 3a to 3c, the innermost LED group 3a has a short circumference and the arrangement interval of the LEDs 3 tends to be narrow, so that uneven illumination occurs even in the bowl-shaped lens 4a. hard. Therefore, as described above, the LED group 3a may be provided with either the bowl-shaped lens 4a or the plurality of single lenses 4b.

  Next, the lighting fixture which concerns on the modification of this embodiment, and the optical member used for this are demonstrated with reference to FIG. 7 thru | or FIG. In this modification, as shown in FIG. 3A, it is assumed that the bowl-shaped lens 4a is provided on the innermost LED group 3a among the LED groups 3a to 3c in a plurality of rows. As shown in FIG. 7, the shape of the exit surface 43 of the bowl-shaped lens 4 a is configured such that the cross-sectional shape in the inner circumferential direction of the instrument body 2 is convex in the inner circumferential direction rather than the optical axis direction of the LED 3. Has been. On the other hand, the cross-sectional shape in the outer peripheral direction of the instrument main body 2 is formed in the light emission surface 43 so that it may become a gentle ellipse shape. Further, the LEDs 3 are arranged so as to be biased toward the inner circumferential direction of the instrument with respect to the incident surface 41.

  Light emitted from the LED 3 from the optical axis L toward the outer periphery of the instrument is refracted toward the optical axis L and led to the emission surface 43. Further, since the emission surface 43 has a gentle elliptical shape, the light reaching the emission surface 43 is emitted radially from the emission surface 43. On the other hand, the light emitted from the LED 3 in the outer peripheral direction of the instrument from the optical axis L is refracted in the inner peripheral direction of the instrument on the incident surface 41 and led out to the output surface 43. Further, since the emission surface 43 is convex in the inner circumferential direction, the light that has reached the emission surface 43 is condensed and emitted from the emission surface 43. As a result, as shown in FIG. 8, light having a narrow angle and low luminance is emitted from the optical axis L toward the outer peripheral direction of the instrument, and light having a wide angle and high luminance is emitted from the optical axis L to the inner peripheral direction of the instrument. As a whole, the amount of light in the inner circumferential direction of the instrument increases.

  Therefore, when this bowl-shaped lens 4a is provided in the innermost LED group 3a, the amount of light in the inner peripheral direction of the instrument increases as shown in FIG. As a result, when only the LED group 3a on the inner peripheral side is turned on, the light applied to the cover 5 becomes circular, and the appearance of the lighting fixture 1 can be improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, a configuration in which three rows of annular LED groups are provided is shown. However, the LED groups may have two rows, one of which is a bowl-shaped lens 4a and the other is a plurality of single lenses. 4b may be provided selectively. Further, the LED group may be four or more rows. In addition, the light exiting surface 43 of the bowl-shaped lens 4a and the single lens 4b may be subjected to light diffusion processing such as embossing. In this way, it is possible to suppress the graininess that appears in the cover 5 when the LED 3 is lit with high brightness.

1 lighting fixture 2 fixture body 3 LED
3a, 3b, 3c LED group 4 Optical member 4a Sponge lens 4b Single lens 43 Output surface

Claims (5)

An instrument main body, an LED group in which a plurality of LEDs are arranged in an annular shape on the instrument main body, and an optical member that is provided in the light emission direction of the LED and controls the light distribution of the light emitted from the LED. Prepared,
The LED group is provided in a plurality of concentric circles around the central part of the instrument body,
The optical member has a bowl-shaped lens that collectively covers a plurality of LEDs that constitute one LED group, and a plurality of single lenses that individually cover the plurality of LEDs that constitute one LED group,
The luminaire is characterized in that the bowl-shaped lens and the plurality of single lenses are selectively provided in units of columns with respect to the LED group.   2. The lighting apparatus according to claim 1, wherein the optical member is formed so as to distribute light emitted from the LED at a wide angle. The LED group is provided in three or more rows,
3. The lighting apparatus according to claim 1, wherein the bowl-shaped lens is provided in any one of an LED group sandwiched between an innermost LED group and an outermost LED group. 4. .   The lighting device according to any one of claims 1 to 3, wherein the single lens is provided in an outermost LED group of the plurality of LED groups. The bowl-shaped lens is provided in the innermost LED group among the plurality of LED groups,
The shape of the exit surface of the bowl-shaped lens is such that the cross-sectional shape in the inner peripheral direction of the instrument body is more convex in the inner peripheral direction than the optical axis direction of the LED. The lighting fixture according to any one of claims 1 to 4.

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