JP2014135233A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To irradiate illumination light looking attractive according to a scene in a lighting apparatus in which a plurality of LEDs are annularly arranged.SOLUTION: A lighting apparatus 1 includes: a plurality of LEDs 3 annularly arranged about a central portion of an apparatus main body 2; and an optical component 4 controlling distributions of light emitted from the LEDs 3. The optical component 4 includes: a dome-like incident surface 41 on which the light emitted from the LEDs 3 is incident; and an emission surface 43 from which the light propagated through a medium portion 42 is emitted. Among distances from a center of a light-emitting portion of each LED 3 to the incident surface 41, a distance r in an optical axis direction and a distance d2 in an outer circumferential direction of the apparatus main body 2 satisfy r/d2<1. With this configuration, it is possible to irradiate illumination light so that brightness is high just under the apparatus, low on an outer circumference of the apparatus, and rapidly lowers from a center of the apparatus toward the outer circumference, and make the illumination light look attractive like a spot light.

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 lens 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. According to this lighting fixture, when illuminating a wide area in the room, the LED groups on both the central side and the outer peripheral side are turned on, and when illuminating a narrow range immediately below the lighting fixture, the central LED group is turned on. . Thereby, the illumination light according to a scene can be irradiated.

JP 2012-146440 A

  By the way, in a ceiling light using an LED as a light source as described above, when illuminating a narrow range directly under a lighting fixture, the brightness at the center of the fixture is high, the outer circumference of the fixture is dark, and the luminance suddenly increases from the center of the fixture toward the outer circumference. It may be desirable to irradiate the illumination light so as to decrease. In this way, the light and dark outline of the ceiling cover is clear, and the illumination light can be irradiated with a good appearance like a spotlight while being a ceiling light. However, since the lens member used in the lighting apparatus of Patent Document 1 diffuses the emitted light from the LED so that luminance unevenness does not occur, when the LED group on the center side is turned on, the illumination light is Irradiation is performed so that the luminance gradually decreases from the center toward the outer periphery. Therefore, it appears that the illumination light is gently emitted from the entire instrument.

  This invention solves the said subject, and it aims at providing the lighting fixture which can irradiate illumination light with good appearance according to the scene using several LED arrange | positioned cyclically | annularly.

  In order to solve the above-described problems, the present invention provides an instrument main body, a plurality of LEDs arranged in an annular shape centering on a central portion of the instrument main body, and the LED emitted from the LEDs provided in the light emission direction of the LED. An optical member for controlling the light distribution, and the optical member covers a light emitting portion of the LED and has a dome-shaped incident surface on which light emitted from the LED is incident; and light incident from the incident surface propagates And a light exit surface from which light propagated through the medium portion exits, and the light incident surface is an optical axis of the LED out of a distance from the center of the light emitting portion of the LED to the light incident surface. The distance r in the direction, the distance d1 in the central direction of the instrument body, and the distance d2 in the outer peripheral direction of the instrument body are configured so as to satisfy r / d1 <1 or r / d2 <1. It is characterized by being.

  In the lighting fixture, when the shape of the incident surface satisfies r / d1 <1, the medium portion has a thickness in the central portion direction of the fixture body that is greater than the optical axis direction of the LED. Is configured to be thinner than the thickness in the outer peripheral direction of the instrument body, and when the shape of the incident surface satisfies r / d2 <1, the outer peripheral direction of the instrument body is greater than the optical axis direction of the LED. It is preferable that the wall thickness is configured to be thinner than the wall thickness in the central portion direction of the device main body than in the optical axis direction of the LED.

  In the above luminaire, when the shape of the incident surface satisfies r / d1 <1, the exit surface has a substantially circular cross-sectional shape in the central direction of the device body rather than the optical axis direction of the LED. It is preferable that when the shape of the incident surface satisfies r / d2 <1, the cross-sectional shape in the outer peripheral direction of the instrument body is substantially circular rather than the optical axis direction of the LED.

  In the above luminaire, when the shape of the incident surface satisfies r / d1 <1, the exit surface has a cross-sectional shape in the outer peripheral direction of the fixture main body that is convex in the outer peripheral direction rather than the optical axis direction of the LED. When the shape of the incident surface satisfies r / d2 <1, the cross-sectional shape in the central part direction of the instrument body is more convex in the central part direction than the optical axis direction of the LED. It is preferable that it is comprised.

  It is preferable that the lighting apparatus further includes a diffusing member that is provided in a light emitting direction from the optical member and diffuses and emits light emitted from the optical member.

  In the above luminaire, it is preferable that the diffusing member has a convex shape or a concave shape in the light emission direction and is formed so that a central portion thereof is flat.

  According to the present invention, the luminance distribution of illumination light can be changed in the direction of the center of the fixture and in the outer peripheral direction rather than in the direction of the optical axis of the LED, and illumination light can be illuminated with good appearance according to the scene.

The disassembled perspective view of the lighting fixture which concerns on one Embodiment of this invention. The sectional side view of the lighting fixture. The expansion perspective view containing the partial cross section of the optical member used for the lighting fixture. (A) is a sectional side view of the optical member of the reference example, (b) is a diagram showing an optical path by the optical member of the reference example, (c) is a diagram showing a light distribution curve by the optical member of the reference example, (d) is The sectional side view of the optical member of the lighting fixture which concerns on the said embodiment, (e) is a figure which shows the optical path by the optical member, (f) is a figure which shows the light distribution curve by the optical member. The brightness | luminance sectional drawing of each illumination light when using the optical member of the lighting fixture which concerns on the said embodiment, and when using the optical member of a reference example. (A) is a figure which shows the front luminance distribution of the illumination light when using the optical member of the said reference example, (b) is the front luminance distribution of the illumination light when using the optical member of the lighting fixture which concerns on the said embodiment. FIG. (A) is a sectional side view of the lighting fixture using the diffusion member different from the said embodiment, (b) is a sectional side view of the lighting fixture using another diffusion member further. (A) is an enlarged perspective view including the partial cross section of the optical member used for the lighting fixture which concerns on the modification of the said embodiment. (B) is a brightness | luminance sectional drawing of illumination light when the same optical member is used, (c) is a figure which shows front luminance distribution of the illumination light.

  The lighting fixture which concerns on one Embodiment of this invention is demonstrated with reference to FIG. 1 thru | or FIG. 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 to control 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 this embodiment, LED groups 3a and 3b formed by arranging a plurality of LEDs 3 in an annular shape are arranged in two rows concentrically.

  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 21 fixed to a power feeding connector or the like provided on the construction surface is provided. Further, a lighting circuit 22 for lighting and driving the LEDs 3 and a substrate 23 on which the LEDs 3 are mounted are provided on the outer peripheral side of the power feeding unit 21. 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 21 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 22 includes a transformer, a capacitor, a control IC, and the like for converting and rectifying the alternating current supplied from the power supply unit 21 into a direct current having a predetermined voltage suitable for the LED 3. The substrate 23 is made of an insulating material such as glass epoxy resin, and a predetermined wiring pattern is formed on the surface on which the LED 3 is mounted. The lighting circuit 22 is configured to be able to light the central LED group 3a and the outer LED group 3b independently of each other based on a user operation. In addition, each LED3 in each LED group 3a, 3b may be comprised so that further partial lighting or thinning-out lighting etc. are possible by grouping individually or in groups.

  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 is a bowl-shaped lens member that collectively covers a plurality of LEDs 3 arranged in an annular shape, and is formed of a light-transmitting resin such as an acrylic resin. In the present embodiment, the optical member 4 includes a central lens portion 4a that covers the LED group 3a on the center side of the fixture and an outer lens portion 4b that covers the LED group 3b on the outer peripheral side of the fixture. In the present embodiment, the central lens portion 4a and the outer lens portion 4b are connected to each other by a base portion 40 for fixing the optical member 4 to the instrument body 2 and are integrally formed. The optical member 4 is fixed to the instrument body 2 via an adjustment member 24 corresponding to the thickness of the substrate 23 on which the LED 3 is mounted.

  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, pigments, or the like to a translucent material such as an acrylic 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.

  As shown in FIG. 3, in addition to the base 40 described above, the optical member 4 covers the light emitting part of the LED 3 and has a dome-shaped incident surface 41 on which light emitted from the LED 3 is incident, and light incident from the incident surface 41 propagates. And a light exit surface 43 from which light propagated through the medium portion 42 is emitted.

  The distance from the center of the light emitting portion of the LED 3 to the incident surface 41 includes a distance r in the optical axis direction of the LED 3, a distance d1 in the central portion direction of the instrument body 2, and a distance d2 in the outer peripheral direction of the instrument body 2. . Among these, in the present embodiment, the incident surface 41 of the central lens portion 4a has a shape in which the distance r in the optical axis direction of the LED 3 and the distance d2 in the outer peripheral direction of the fixture body 2 satisfy r / d2 <1. It is comprised so that. The medium portion 42 is configured such that the thickness in the outer peripheral direction of the fixture body 2 is thinner than the thickness in the central portion direction of the fixture body 2 than in the optical axis direction of the LEDs 2. ing. Further, the exit surface 43 has a cross-sectional shape in the outer peripheral direction of the instrument body 2 that is substantially circular rather than the optical axis direction of the LED 3, and has a cross-sectional shape in the central part direction of the instrument body 2 than the optical axis direction of the LED 3. Further, it is configured to have a convex shape in the central portion direction.

  Here, as shown in FIG. 4A, the distance r in the optical axis direction of the LED 3 and the distance d2 in the outer peripheral direction of the instrument body 2 are configured to satisfy a shape satisfying r / d2 = 1. The optical member 104 is given as a reference example. Note that the medium portion 142 and the emission surface 143 of the optical member 104 according to this reference example have the same shape as the medium portion 42 and the emission surface 43. Since the incident surface 141 of the optical member 104 is generally hemispherical, the incident angle of the light emitted radially from the center of the light emitting portion of the LED 3 is greater in the direction of the central portion of the instrument body 2 than in the optical axis direction of the LED 3 and It is small in any direction of the outer circumferential direction. For this reason, as shown in FIG. 4B, the refraction angle is also reduced, and the light incident on the optical member 4 propagates through the medium part 42 at a relatively wide angle. And since the emission surface 43 is formed so that the cross-sectional shape in the outer peripheral direction of the instrument body 2 is substantially circular rather than the optical axis direction of the LED 3, the light propagating in the outer peripheral direction is not greatly refracted, The light is diffused and emitted from the optical member 4. On the other hand, since the emission surface 43 is formed so that the cross-sectional shape in the central portion direction of the instrument body 2 is more convex in the central portion direction than the optical axis direction of the LED 3, the light propagated in the central portion direction. Is largely refracted in the protruding direction of the emission surface 43 and is emitted from the optical member 4. As a result, as shown in FIG. 4 (c), light is emitted in a relatively wide range over the entire range, not only in the central direction of the instrument body 2 but also in the outer peripheral direction, rather than in the optical axis direction of the LED 3.

  On the other hand, as shown in FIG. 4D, in the optical member 4 configured so that the incident surface 41 has a shape satisfying r / d2 <1, the light of the LED 3 is lighter than that of the optical member 104. The incident angle of the light which goes to the outer peripheral direction of the instrument main body 2 becomes larger than the axial direction. Therefore, as shown in FIG. 4E, the refraction angle also increases, and the light incident on the optical member 4 is relatively refracted in the optical axis direction of the LED 3 and propagates through the medium portion 42. As a result, as shown in FIG. 4 (f), more light is emitted in the optical axis direction of the LED 3 in the outer peripheral direction of the instrument body 2 than in the optical axis direction of the LED 3. Here, the incident surface 41 is designed so that r = 4.9, d2 = 5.5, and r / d2 = 0.89.

  FIG. 5 is a luminance cross-sectional view of the front of the fixture when the optical member 4 and the optical member 104 configured as described above are incorporated in the lighting fixture 1 and the central LED group 3a is turned on. As shown in FIG. 4C and FIG. 4F, the light distribution toward the central direction of the fixture body 2 rather than the optical axis direction of the LED 3 is the optical member 4 (r / d2 <1) and All of the optical members 104 (r / d2 = 1) are the same. Therefore, in the case where any of the optical member 4 (solid line) and the optical member 104 (dotted line) is used, the luminance immediately below, particularly the central portion, is the highest.

  On the other hand, when the optical member 4 (solid line) is used, there is a peak where the luminance increases around the center of the appliance, and the luminance suddenly decreases in the peripheral direction from the luminance peak. On the other hand, when the optical member 104 (dotted line) is used, the luminance gradually decreases from the center of the instrument toward the outer peripheral direction.

  FIG. 6 shows respective front luminance distributions of the optical member 104 (r / d2 = 1) and the optical member 4 (r / d2 <1). As shown in FIG. 6A, when the optical member 104 is used, it appears that the illumination light is gently emitted from the entire instrument. On the other hand, as shown in FIG. 6B, when the optical member 4 is used, the brightness directly under the instrument is high, the instrument outer periphery is dark, and the brightness suddenly decreases from the instrument center toward the outer periphery. Illumination light can be irradiated. Thereby, the outline of the light and darkness in the ceiling cover is clear, and it is possible to irradiate illumination light with good appearance like a spotlight while being a ceiling light.

  The cover 5 is not limited to the shape shown in FIGS. 1 and 2, and for example, as shown in FIG. 7A, the cover 5 has a convex shape in the light emission direction and is formed so that the central portion thereof is flat. It may be. Moreover, as shown in FIG.7 (b), it is concave shape in the light emission direction, and you may form so that the center part may become flat. The flat portion of the cover 5 is preferably formed so that the outer diameter thereof is the same as the width of the luminance peaks on both outer sides shown in FIG. In this way, when the LED group 3a closer to the center is turned on, the illumination light is emitted from the flat portion of the cover 5, so that the appearance of the luminaire can be improved.

  Next, the lighting fixture which concerns on the modification of the said embodiment is demonstrated with reference to FIG. As shown in FIG. 8A, in the lighting fixture according to this modification, the incident surface 41 of the central lens portion 4a of the optical member 4 has a distance r in the optical axis direction of the LED 3 and the central portion direction of the fixture body 2. The distance d1 and r / d1 <1 are satisfied. Further, the medium portion 42 is configured such that the thickness in the central direction of the instrument body 2 is thinner than the thickness in the outer peripheral direction of the instrument body 2 than the optical axis direction of the LED 2 than the optical axis direction of the LED 3. Yes. Furthermore, the exit surface 43 has a cross-sectional shape in the outer peripheral direction of the instrument body 2 that is substantially circular in cross-section in the central portion direction of the instrument body 2 relative to the optical axis direction of the LED 3 and in the direction of the optical axis of the LED 3. It is configured to have a convex shape in the outer peripheral direction. According to this optical member 4, the optical path and the light distribution shown in FIGS. 4E and 4F of the above embodiment and the optical path and the light distribution to be mirrored are obtained.

  FIG. 8B is a luminance cross-sectional view of the front of the fixture when the optical member 4 (r / d1 <1) in this modification is incorporated in the lighting fixture 1 and the central LED group 3a is turned on. (C) shows the front luminance distribution at that time. As shown in these figures, when the optical member 4 (r / d1 <1) is used, the luminance at the center portion is particularly low in the luminance immediately below the lighting fixture. Therefore, the light and dark outline of the ceiling cover has a donut shape, and illumination light can be uniquely irradiated.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. The incident surface 41 of the optical member 4 should just be formed in the shape which satisfy | fills at least one of r / d2 <1 or r / d1 <1, and may satisfy both. That is, r / d1 ≧ 1 and r / d2 ≧ 1 are not satisfied, and d1 = d2 is not satisfied. In this way, in a lighting fixture in which a plurality of LEDs are arranged in a ring shape, the luminance distribution of the illumination light can be changed in the fixture center direction and the outer peripheral direction rather than the LED optical axis direction, and the illumination is pleasing according to the scene. Light can be irradiated. Further, it is desirable that the incident surface 41 be formed so that r / d2 and r / d1 are 0.5 or more so that the light emitted from the LED 3 can be efficiently incident into the optical member 4. .

  For example, the LED group and the lens unit are not limited to two rows, and may be one row or three or more rows. Furthermore, in the said embodiment and the modification, although the incident surface 41 of the center lens part 4a gave the example which satisfy | fills r / d2 <1 or r / d1 <1, the outer side lens part 4b is also the center lens part 4a. It may be the same. Further, the incident surface 41 of the central lens portion 4a may satisfy r / d2 <1, and the incident surface 41 of the outer lens portion 4b may satisfy r / d1 <1. In this case, when the LED group 3a on the center side and the LED group 3b on the outer peripheral side are turned on, the light and dark outline in the ceiling cover changes from light to dark to light from the center, and the light and darkness spread in a ring shape. Can be irradiated more uniquely.

1 lighting fixture 2 fixture body 3 LED
4 Optical member 41 Incident surface 42 Medium part 43 Output surface 5 Diffusion member (cover)
d1 The distance in the optical axis direction of the LED out of the distance from the center of the light emitting part of the LED to the incident surface d2 The distance in the central part direction of the instrument body r The distance in the outer peripheral direction of the instrument body

Claims (6)

An instrument main body, a plurality of LEDs arranged in an annular shape centering on the central portion of the instrument main body, 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 optical member covers a light emitting portion of the LED, a dome-shaped incident surface on which light emitted from the LED is incident, a medium portion on which light incident from the incident surface propagates, and light propagated through the medium portion An exit surface for exiting,
Among the distances from the center of the light emitting portion of the LED to the incident surface, the incident surface is a distance r in the optical axis direction of the LED, a distance d1 in the central portion direction of the device body, and an outer periphery of the device body. A luminaire configured to have a shape satisfying a distance d2 in a direction satisfying r / d1 <1 or r / d2 <1. The medium portion is
When the shape of the incident surface satisfies r / d1 <1, the thickness in the central portion direction of the fixture body is larger than the optical axis direction of the LED in the outer peripheral direction of the fixture body than in the optical axis direction of the LED. Configured to be thinner than the thickness,
When the shape of the incident surface satisfies r / d2 <1, the thickness in the outer peripheral direction of the instrument body is greater in the central direction of the instrument body than in the optical axis direction of the LEDs. 2. The lighting fixture according to claim 1, wherein the lighting fixture is configured to be thinner than the thickness. The exit surface is
When the shape of the incident surface satisfies r / d1 <1, the cross-sectional shape in the central portion direction of the instrument body is substantially circular rather than the optical axis direction of the LED,
The cross-sectional shape in the outer peripheral direction of the instrument body is substantially circular when compared with the optical axis direction of the LED when the shape of the incident surface satisfies r / d2 <1. The lighting fixture of Claim 1 or Claim 2. The exit surface is
When the shape of the incident surface satisfies r / d1 <1, the cross-sectional shape in the outer peripheral direction of the instrument body is more convex in the outer peripheral direction than the optical axis direction of the LED,
When the shape of the incident surface satisfies r / d2 <1, the cross-sectional shape in the central portion direction of the instrument body is more convex in the central portion direction than the optical axis direction of the LED. The luminaire according to any one of claims 1 to 3, characterized by:   5. The diffusion member according to claim 1, further comprising a diffusing member that is provided in a light emitting direction from the optical member and diffuses and emits light emitted from the optical member. lighting equipment.   The lighting device according to claim 5, wherein the diffusion member has a convex shape or a concave shape in a light emission direction, and is formed so that a central portion thereof is flat.