JP2012119140A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture alleviating unpleasant glare toward a user, alleviating luminance unevenness on an irradiation face, making an irradiation object easy to see, and hardly tiring eyes.SOLUTION: The lighting fixture includes: an arm fixed to a body with a tip part as a free end; a lamp fitting supported by the tip part of the arm; a single LED unit 11 fitted to the lamp fitting; a lens 15 for refracting emission light from the LED unit 11; a concave curved surface 39 formed on one of the faces 43 of the lens 15 with a center axis 44 of the lens 15 as a center; a first flat face 40 formed in a ring shape surrounding the concave curved surface 39 on the one face 43 of the lens 15 and crossing the center axis 44; a second flat face 41 formed on the other face 45 of the lens 15 centering on the center axis 44 and crossing the center axis 44; and a convex curved surface 42 formed in a ring shape surrounding the second flat face 41 at an outer periphery edge 46 of the other face 45.

Description

  The present invention relates to a lighting fixture.

  Lighting fixtures with high illumination efficiency with a small number of light sources have been proposed. For example, in the illumination device described in Patent Document 1, a plurality of light emitters irradiate in the same direction, and a reflector surrounded by the plurality of light emitters reflects light on its side surface. The light emitted from the illuminator is partially reflected on the side of the reflector, and it is close to an ideal bat-wing-like light distribution by combining the reflected light and the direct light emitted directly from the illuminant. Energy saving is achieved by obtaining illumination light.

  Further, the LED lighting apparatus described in Patent Document 2 is formed such that the incident end is concave, the output end is substantially flat, the side surface is curved, and the cross section with respect to the central axis is circular, and is incident on the incident end. The light emitted from the LED is totally reflected on the inner surface of the side surface, and is refracted in a direction away from the central axis at the emission end to be emitted, so that the emitted light of the LED is batted The light distribution is controlled in a wing shape to ensure the illuminance directly below and around the LED lighting fixture.

  In addition, the street lighting apparatus described in Patent Document 3 includes a fluorescent lamp including at least one rod-like arc tube as a light source, a reflection plate provided above the light source, and at least from an end of the reflection plate. A translucent cover disposed so as to surround the light source, and at least a surface of the reflector that faces the light source forms a specular reflection surface, and at least below the light source of the translucent cover A light refraction process is applied to the region located at.

JP 2009-218158 A (Claim 1, FIG. 9) JP 2005-129517 A (Claim 1, FIG. 1) JP 2000-331504 A (Claim 5, FIG. 7)

  However, the above-described conventional lighting fixtures are all for irradiating the irradiated surface with a small number of light sources and a small number of parts to a certain level of brightness, and the glare caused by the spread of emitted light to the surroundings. Is not taken into account. Further, in the case of a single LED package in which a plurality of LED chips are mounted at high density, color unevenness occurs. As shown in FIG. 13, the illuminance distribution of the circular irradiation surface illuminated by the radial emitted light from this single LED package is highest at the center (about 580000 lx) in the diametrical cross section, and the distance from the center is the same. Gradually lower as you leave. Further, it has been found that the distribution of chromaticity x, y in the same cross section matches the color unevenness of the observation result in the color unevenness regions U1, U2, U3, U4, U5 shown in FIG.

  The present invention has been made in view of the above situation, and its purpose is to reduce unpleasant glare to the user, reduce illuminance unevenness on the irradiation surface, make it easy to see the irradiation object, and make it difficult to fatigue the eyes. It is in providing the lighting fixture to do.

  The lighting fixture of the present invention includes an arm that is fixed to the main body and has a free end at the tip, a lamp that is supported by the tip of the arm, a single LED unit that is provided in the lamp, and the LED unit. A lens that refracts outgoing light; a concave curved surface formed on one surface of the lens with the central axis of the lens as a center; and a central surface that is formed in an annular shape surrounding the concave curved surface on one surface of the lens A first flat surface orthogonal to the axis, a second flat surface formed around the central axis on the other surface of the lens and orthogonal to the central axis, and the second flat surface on an outer peripheral edge of the other surface. And a convex curved surface formed in an annular shape.

  Moreover, the lighting fixture of this invention WHEREIN: As for the said lens, a said 2nd flat surface is formed smaller than the range of the said concave curved surface.

  In the illuminating device of the present invention, the entire surface of one surface and the other surface of the lens is textured.

  Furthermore, in the lighting fixture of the present invention, concentric grooves centering on the central axis are formed on the entire surface of one surface and the other surface of the lens.

  The luminaire according to the present invention can reduce unpleasant glare to the user, reduce illuminance unevenness on the irradiated surface, make it easier to see the irradiated object, and make the eyes less likely to get tired.

The side view which shows the lighting fixture of 1st Embodiment which concerns on this invention. Expanded sectional view of the lamp shown in FIG. Bottom view of the lamp shown in FIG. AA sectional view of FIG. Expanded sectional view of the LED unit (A) is a ray tracing diagram of the lens, and (B) is a plan view of the lens. Schematic showing the correlation between the position of the lamp, the desk surface and the eyes Plan view showing the actual range of use on the desk surface Correlation diagram between brightness and irradiation angle at a fixed distance obtained by the lens shown in FIG. Correlation diagram between brightness obtained by the lens shown in FIG. 6 and necessary irradiation range The perspective view of the lens in the lighting fixture of 2nd Embodiment which concerns on this invention. (A) is an enlarged view of the groove, (B) is a plan view of the lens shown in FIG. A graph showing the illuminance part of a conventional lighting fixture Graph showing the distribution of chromaticity by conventional lighting fixtures

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a side view showing a lighting apparatus according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of the lamp shown in FIG. 1, FIG. 3 is a bottom view of the lamp shown in FIG. 2, and FIG. FIG.
The lighting fixture 10 of the present embodiment includes an LED unit 11, a lamp 12 that houses the LED unit 11, a power block 13 that supplies power to the LED unit 11, a lens 15 that refracts light from the LED unit 11, A main body 16 that houses the power supply block 13, an arm 17 that connects the lamp 12 and the main body 16, and a hinge 19 that is provided between the lamp 12 and the tip 18 of the arm 17 are provided.

The lighting fixture 10 has one end connected to the LED unit 11, the other end connected to the male connector 21 of the wire connector 20, and one end connected to the female connector 23 of the wire connector 20. A second electric wire 24 having the other end connected to the power supply block 13 is provided. The first electric wire 22 and the second electric wire 24 are detachably connected by the electric wire connector 20. Further, the electric wire connector 20 is disposed at a location other than between the hinge portion 19 and the LED unit 11 in the lamp 12.
Note that the first electric wire 22 may be connected to the female connector 23 and the second electric wire 24 may be connected to the male connector 21.

The second electric wire 24 in the lamp 12 is disposed outside the LED unit 11 and is fixed to the lamp 12 by a fixing portion 25. The fastening part 25 has a pair of clamping pieces 26 and a clamping piece 27 provided on the lamp 12. The second electric wire 24 is sandwiched between a pair of sandwiching pieces 26 and a sandwiching piece 27.
In this lighting fixture 10, the first electric wire 22 and the second electric wire 24 are detachably connected by the electric wire connector 20, so that the LED unit 11 and the lamp 12 can be easily disassembled. The LED unit 11 can be easily replaced or repaired without disassembling 16. Therefore, when the LED unit 11 is repaired or exchanged, it is possible to save time and cost can be reduced.

  Moreover, since the electric wire connector 20 is disposed at a place other than between the hinge portion 19 and the LED unit 11, the lamp 12 can be made compact. On the other hand, if the electric wire connector 20 is disposed between the hinge portion 19 and the LED unit 11, the lamp 12 is increased in size. Moreover, the fastening part 25 which fastens the 2nd electric wire 24 is provided in the location from the hinge part 19 in the lamp 12 to the electric wire connector 20, and the 2nd electric wire 24 is prevented from getting entangled with other parts. is doing.

  Further, since the fastening portion 25 is provided outside the LED unit 11, the second electric wire 24 is used to illuminate the LED unit 11 when the lamp 12 is rotated or when the lighting fixture 10 is assembled. This prevents the light from going around in the direction (the front surface of the LED unit 11) and prevents the light from being blocked.

FIG. 5 is an enlarged cross-sectional view of the LED unit 11.
The LED unit 11 provided in the lamp 12 is a single unit. In the LED unit 11, the Cu substrate 30 is fixed to the housing 28 of the lamp 12 via the organic green sheet 29. The organic green sheet 29 is made of a resin sheet that contains a filler made of a filler such as silica or alumina and has a reduced viscosity when heated. The LED chip 14 is provided on the surface of the Cu substrate 30 via a submount 31 that is an insulating layer. For example, aluminum nitride (AlN) is used for the submount 31. As the LED chip 14, a GaN-based blue semiconductor light emitting element that emits blue light (λ≈400 to 460 nm) is preferably used. In the LED chip 14, electrodes are connected to a circuit of a wiring board 32 provided on the submount 31 or the Cu substrate 30 by wires 33. The LED chip 14 and the wire 33 are covered with a thin resin made of silicone resin. The thin resin is further covered with a phosphor cap 35 through the air layer 34.

  The phosphor cap 35 is formed by dispersing a green phosphor, a yellow phosphor, and a red phosphor in a translucent silicone resin and then curing. The phosphor cap 35 converts a part of the blue light from the LED chip 14 into green light (λ≈540 to 565 nm), yellow light (λ≈560 to 580 nm), and red light (λ≈680 to 720 nm). These lights are mixed and white light is generated.

6A is a ray tracing diagram of the lens 15, and FIG. 6B is a plan view of the lens 15. FIG. 6A shows a BB cross section of FIG.
A lens 15 that refracts light emitted from the LED unit 11 is attached to the bottom surface of the lamp 12. A shade portion 37 is provided on the bottom surface of the lamp 12, and the shade portion 37 is disposed below the lens 15. An irradiation range to be described later is set according to the positional relationship between the lens 15 and the shade portion 37.

  The lens 15 functions as a light distribution control unit that focuses and diverges the light flux from the LED unit 11 by refraction. The lens 15 is formed in a circular shape, and convex portions 38 for attachment are formed at both ends in the diameter direction. As the material of the lens 15, a transparent material such as a resin material such as acrylic, styrene, or polycarbonate, or a glass material can be used.

  The lens 15 is roughly divided into a concave curved surface 39, a first flat surface 40, a second flat surface 41, and a convex curved surface 42. The concave curved surface 39 is formed in a circular shape around the central axis 44 of the lens 15 on one surface 43 of the lens 15. The concave curved surface 39 constitutes a first refracting portion and refracts the central light to the surroundings. The first flat surface 40 surrounds the concave curved surface 39 on one surface 43 of the lens 15 and is formed in an annular shape and is orthogonal to the central axis 44. The second flat surface 41 is formed on the other surface 45 of the lens 15 around the central axis 44 and is orthogonal to the central axis 44. The convex curved surface 42 is formed in an annular shape so as to surround the second flat surface 41 at the outer peripheral edge 46 of the other surface 45. The convex curved surface 42 constitutes a second refracting portion and condenses light spreading around.

  In the lens 15, the second flat surface 41 is formed smaller than the range of the concave curved surface 39. That is, the point K where R of the concave curved surface 39 starts overlaps the range M of R of the convex curved surface 42. As a result, the portion sandwiched between the parallel first flat surface 40 and the second flat surface 41 formed when the second flat surface 41 is larger than the range of the concave curved surface 39 is not formed in the lens 15 and is refracted. This makes it easy to control the light deflection.

  In addition, the entire surface of the one surface 43 and the other surface 45 of the lens 15 is textured. Due to the minute unevenness provided by the embossing provided on the entrance surface and the exit surface of the lens 15, the incident light and the exit light become diffused light, and the color unevenness caused by the change in the refractive index depending on the wavelength is alleviated. .

  The lighting fixture 10 is often used at a height of 30 to 60 cm from the desk top surface of the lower end of the lamp, and in this embodiment, a height of 40 cm is assumed. The dimensions of the lens 15 in this case are as follows: the diameter D of the lens 15 is 48 mm, the thickness T is 3 mm, the radius Ra of the concave curved surface 39 is 25 mm, the depth d1 of the concave curved surface 39 is 1.5 mm, and the radius Rb of the convex curved surface 42 is. = 135 mm, R range M of the convex curved surface 42 = 18 mm, and a step h = 1.2 mm between the second flat surface 41 and the convex curved surface 42 is a standard.

Next, the effect | action of the lighting fixture 10 which has the above-mentioned structure is demonstrated.
FIG. 7 is a schematic diagram showing the correlation among the lamp 12, the desk surface 47, and the eye position.
As for the lighting fixture 10, the height H from the desk top surface 47 of a lamp lower end shall be 40 cm as mentioned above. The distance L from the eye position to the center of the lamp 12 is 60 cm. The eye height is E (H> E). Under this condition, in the lighting fixture 10, the irradiation range on the desk irradiated with the illumination light emitted from the lamp 12 becomes a range N of 50 cm from the lamp 12. In this necessary range N of illumination, illuminance is ensured uniformly. Further, the lamp 12 ensures the incident angle difference αd of the illumination light to the eye and prevents glare by reducing the irradiation angle α1 by the shade unit 37 to the extent that the necessary illumination range N is ensured. Has been made.

FIG. 8 is a plan view showing an actual use range on the desk surface 47.
With the above configuration, a uniform irradiation surface with uniform brightness is formed on the desk surface 47 within a radius of 50 cm. By this range, for example, the first area close to the A3 paper, which is frequently used, and the second area close to the newspaper spread size have uniform illuminance, and the stress on the eyes is more effectively reduced.

FIG. 9 is a correlation diagram between the brightness at a fixed distance and the irradiation angle obtained by the lens 15 shown in FIG.
In the luminaire 10, the lens 15 having the concave curved surface 39 at the center of the one surface 43 and the convex curved surface 42 at the outer peripheral edge 46 of the other surface 45 is installed in front of the LED unit 11, so that the lens 15 spreads around. The light bundle from the LED unit 11 is focused by the refraction of the convex curved surface 42, and the central light bundle is diverged to the surroundings by the refraction of the concave curved surface 39. As a result, light distribution close to the ideal bat wing-shaped light distribution indicated by the solid line in FIG. 9 is obtained compared to the light distribution in which the lens 15 indicated by the one-dot chain line in FIG. 9 is not provided.

FIG. 10 is a correlation diagram between the brightness obtained by the lens 15 shown in FIG. 6 and the necessary irradiation range.
Moreover, in the lighting fixture 10, an irradiation angle is restrict | limited compared with the conventional structure so that light may be irradiated only to a required range by the light distribution of the lens 15 mentioned above. That is, in the necessary illumination range in which the distance from the lamp vertically on the desk to the user is equally divided into n1 to n11, the irradiation surface is reduced by reducing the illuminance ratio between the maximum illuminance and the minimum illuminance, compared to the conventional configuration. The unevenness of brightness is suppressed to a small level.

Next, 2nd Embodiment of the lighting fixture 10 which concerns on this invention is described.
11 is a perspective view of the lens 49 in the lighting apparatus of the second embodiment according to the present invention, FIG. 12A is an enlarged view of the groove 50, and FIG. 11B is a plan view of the lens 49 shown in FIG. FIG. 12A shows a CC cross section of FIG.
The lens 49 is formed in a circular shape, and a plurality of concave notches 51 for attachment are formed on the outer periphery. A concentric groove 50 centering on the central axis 44 is formed on the entire surface of the one surface 43 and the other surface 45 of the lens 49. The groove 50 is formed in a wave shape. More specifically, a large number of grooves 50 having a radius r = 1 mm and a depth d2 = 0.05 mm are formed concentrically at a pitch p = 3 mm.

According to the configuration of this embodiment, the plurality of grooves 50 larger than the embossing are formed concentrically around the central axis 44 of the lens 49, so that the color unevenness caused by the change in the refractive index depending on the wavelength is eliminated. It is relaxed equally in the radial direction around the central axis 44 and in all directions in the radial direction.
In addition, the groove | channel 50 may be formed independently and may be formed together with the above-mentioned embossing.

  Therefore, according to the luminaire 10 according to the present embodiment, it is possible to reduce unpleasant glare to the user, reduce illuminance unevenness on the irradiation surface, make it easy to see the irradiation object, and make the eyes less tired. Can do.

DESCRIPTION OF SYMBOLS 10 Lighting fixture 11 LED unit 12 Lamp 15 Lens 16 Main body 17 Arm 18 Tip part 39 Concave surface 40 1st flat surface 41 2nd flat surface 42 Convex surface 43 One surface 44 Central axis 45 The other surface 46 Outer periphery 50 Groove

Claims (4)

  An arm fixed to the main body and having a free end at the tip; a lamp supported by the tip of the arm; a single LED unit provided in the lamp; and a lens that refracts light emitted from the LED unit; A concave curved surface formed on one surface of the lens around the central axis of the lens, and a first flat surface which is formed in an annular shape surrounding the concave curved surface on one surface of the lens and orthogonal to the central axis A surface, a second flat surface formed around the central axis on the other surface of the lens and perpendicular to the central axis, and an annular shape surrounding the second flat surface at the outer periphery of the other surface And a convex curved surface. The lighting fixture according to claim 1,
The lens is a lighting fixture in which the second flat surface is formed smaller than a range of the concave curved surface. The lighting fixture according to claim 1 or 2,
A lighting fixture in which the entire surface of one surface and the other surface of the lens is subjected to graining. In the lighting fixture of any one of Claims 1-3,
The lighting fixture in which the concentric groove | channel centering on the said central axis is formed in the whole surface of the one surface and the other surface of the said lens.

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