JP2008300203A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of improving apparatus efficiency by reducing luminance unevenness and advantageous in cost by making components common. <P>SOLUTION: The luminaire includes a luminaire body 10; semiconductor light-emitting elements 21 arranged at the outer fringes 14, 15 of the luminaire body; lens bodies 30 which are arranged opposed to light emitting direction of the semiconductor light-emitting elements and control mainly in parallel direction light of the semiconductor light-emitting elements; reflectors 40 which are opposed to the semiconductor light-emitting elements and are inclined toward nearly the center of the luminaire body; and a globe 50 which covers the semiconductor light-emitting elements and the reflectors and of which transmissivity becomes high as it goes from the outer fringe to the center. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

   The present invention relates to a lighting fixture such as a ceiling light using a semiconductor light emitting element such as a light emitting diode as a light source.

  Conventionally, as this type of lighting fixture, there are an appliance main body that is detachably attached to a hook ceiling installed on a ceiling surface of a house, an annular fluorescent lamp disposed on the lower surface side of the appliance main body, and an annular fluorescent lamp. A ceiling light provided with a glove that is detachably attached to the lower surface of the cover device main body is known (for example, see Patent Document 1).

In recent years, due to the improvement of the light emission efficiency of semiconductor light emitting devices, for example, light emitting diodes, lighting fixtures that employ light emitting diodes as light sources for general lighting have been commercialized. Also, a part of a light source, for example, a light source of an all-night light source is known (for example, see Patent Document 2). Furthermore, as shown in Patent Document 3, a hollow sidelight type surface illumination device provided with a long light source and a long convex lens in the housing, an irregular reflection layer and an air layer, and a light diffusion layer on the exit surface of the housing Is known, and is mainly used for LCD backlights and billboard lights.
JP 2006-128147 A Japanese Patent Laid-Open No. 2003-242808 Japanese Patent No. 2657472

  On the other hand, in the case of a ceiling light using an annular fluorescent lamp as a light source as shown in Patent Documents 1 and 2, soft light is preferred for residential use. For this reason, the brightness unevenness of the globe that becomes the light emitting surface, especially the ring-shaped bright image associated with the ring-shaped fluorescent lamp and the dark part that occurs in the central part, are suppressed, so the globe uses a material with high light diffusibility and low transmittance. As a result, the instrument efficiency (apparatus luminous flux / lamp luminous flux) is generally as low as about 50%. For this reason, when a light emitting diode is used as a light source as it is, even if the light emitting diodes are uniformly arranged on the light emitting surface, the luminance of the light emitting diode itself is high, so that an image is generated on the globe and uneven brightness occurs. After all, it is necessary to use a material that has high light diffusibility and low transmittance for the globe.

  In addition, when the hollow sidelight system as shown in Patent Document 3 is used, it is possible to relatively easily increase the luminance uniformity of the display surface. However, the ceiling light for a house is a backlight or a signboard lamp. The structure is fundamentally different from that of the housing and is not a housing structure. The light source is attached to the bare reflecting surface and the entire surface is covered with a curved glove. For this reason, in the case of a ceiling light, the light source part cannot be hidden by the housing as in the case of the hollow sidelight system, and brightness unevenness tends to occur particularly near the light source part, and the glove has high light diffusibility. A material having low transmittance must be used, and the efficiency of the instrument is reduced.

  In addition, the shape and reflection characteristics of the reflective surface of the hollow sidelight system (diffuse reflection layer of Patent Document 3) are designed to increase the luminance uniformity of the emission surface, but the shape of the emission part changes. Therefore, it is necessary to change the design of the reflecting surface accordingly. On the other hand, in the case of residential ceiling lights, there are a number of glove-shaped models and lineups that match the atmosphere of the room, and adopting the hollow sidelight method as it is in the ceiling light requires a different reflective surface for each model, There is a problem that the development cost and the part cost are soaring.

  For this reason, when the light source of a lighting fixture such as a residential ceiling light is used as a semiconductor light emitting device such as a light emitting diode, the luminance unevenness of the globe, which is the light emitting surface, is reduced, and the efficiency of the fixture is improved. An important issue is how to realize a lighting fixture that does not require a change in the design of the surface and causes no problem in terms of cost.

  The present invention has been made in view of the above problems, and is intended to provide a lighting apparatus that can improve brightness by reducing luminance unevenness and that is advantageous in terms of cost by sharing parts. is there.

  The invention of the lighting fixture according to claim 1 includes: a fixture main body; a semiconductor light emitting element disposed on an outer edge portion of the fixture main body; and arranged to face the light emission direction of the semiconductor light emitting element. A lens body that controls the light source mainly in a parallel direction; a reflector that faces the semiconductor light-emitting element and is inclined toward a substantially central portion of the fixture body; covers the semiconductor light-emitting element and the reflector, and transmits as it goes from the outer edge portion to the central portion. And a glove having a high rate.

  According to the present invention, a lens body that is disposed facing the light emitting direction of the semiconductor light emitting element and controls the light of the semiconductor light emitting element mainly in a parallel direction, and is inclined toward the substantially central portion of the fixture body facing the semiconductor light emitting element. And a glove that covers the semiconductor light emitting element and the reflector so that the transmittance increases as it goes from the outer edge part to the center part. It is possible to increase the transmittance of the part that is not present. In addition, the reflector shape and reflection characteristics are designed so that the degree of uniformity is obtained with respect to a typical globe shape. Can be reduced, and a reflector can be used in common.

  In the present invention, the lighting fixture is preferably a ceiling light for a house, but is not limited to a house, and may be a lighting fixture for a facility such as an office or a business. The shape may be a round shape such as a circle or an ellipse, a square shape such as a square or a rectangle, or a polygon such as a hexagon or an octagon, and is not limited to a specific shape.

  The instrument body is made of a metal plate such as an iron plate with a white coating or a white synthetic resin as a disk-shaped chassis, and is detachably installed in the center on a hook ceiling installed on the instrument mounting surface such as the ceiling Or an adapter having a lighting device for lighting the light source is allowed. Moreover, even if the shape has comprised the shape according to the shape of the lighting fixture, the shape different from the shape of a lighting fixture may be made.

  As the semiconductor light emitting element, a light emitting element using a semiconductor as a light source, such as a light emitting diode or a semiconductor laser, is allowed. Further, the semiconductor light emitting element is configured as a light emitting module having a long straight line or a curved line, etc., and it is preferable that a necessary number is selected and disposed on the outer edge portion of the instrument body. The means is not particularly limited, for example, by constituting the light source in the form of a single light-emitting element directly without forming a module. Even if it arrange | positions to the perimeter of the outer edge part of an instrument, for example, you may make it arrange | position only in the edge | side which opposes in the lighting fixture which makes a square shape.

  The lens body is preferably a lens body such as a long convex lens that is disposed so as to face the light emitting direction of the semiconductor light emitting element and emits the light of the semiconductor light emitting element with a spread by controlling mainly in the parallel direction. Moreover, the lens body may be integrated into the light emitting module. Further, the lens body is preferably a collimator lens that exits the lens, for example, when the focused light becomes non-aberration parallel light, but is not limited to this, and the light from the semiconductor light emitting element is converted into parallel light. All lens bodies having a function of emitting light are allowed.

  The reflector is allowed to be a metal such as an iron plate or a white synthetic resin, or a mirror-finished metal such as aluminum or stainless steel, with both ends facing the light source, It has a shape that is inclined from the middle part toward the substantially central part of the instrument body. The inclined portion may be continuously inclined gradually or may be discontinuously inclined such as stepped.

  The globe may be made of a milky white translucent synthetic resin or tempered glass that covers the light source and the reflector and has translucency. The glove is configured so that the transmittance increases as it goes from the outer edge to the center. For example, the glove can be thinned from the outer edge to the center so that the thickness decreases from the outer edge to the center. Even if the transmittance increases as it goes to the part, even if the transmittance is changed by forming a gradation by screen printing on the inner surface, or even if it is formed by changing the composition of the diffusing material, the unevenness is further increased. It may be formed by changing the density of the diffusion part by the part or the like. The color is not limited to milky white, and various colors according to use, atmosphere, etc. are allowed. It is preferable that the lighting fixtures of various shapes are configured by forming the shape into a round shape, a square shape, a polygonal shape, or the like.

  The invention of the lighting fixture according to claim 2 includes: a fixture main body; a semiconductor light emitting element disposed at an outer edge portion of the fixture main body; and a long collimator lens disposed to face the light emission direction of the semiconductor light emitting element. And a reflector that faces the semiconductor light emitting element and is inclined toward a substantially central portion of the instrument body; and a globe that covers the semiconductor light emitting element and the reflector.

  According to a third aspect of the present invention, in the luminaire according to the second aspect, the collimator lens includes a smooth incident surface; and an exit surface having a substantially elliptical cross section having a first focal point at the center of the incident surface. It is characterized by comprising.

  According to a fourth aspect of the present invention, in the luminaire according to the second or third aspect, the semiconductor light emitting element is disposed such that the light emission center thereof is located on the globe side with respect to the first focal point of the collimator lens. And

  According to a fifth aspect of the present invention, in the lighting apparatus according to any one of the first to fourth aspects, the thickness of the globe is reduced as it goes from the outer edge portion to the central portion.

  According to the first aspect of the present invention, the lens body that is arranged to face the light emitting direction of the semiconductor light emitting element and controls the light of the semiconductor light emitting element mainly in the parallel direction, and the abbreviated shape of the fixture body facing the semiconductor light emitting element. Diffuse the globe only in areas where it is necessary to take measures against uneven brightness, with the reflector tilted toward the center and the globe that covers the semiconductor light-emitting element and reflector so that the transmittance increases from the outer edge to the center. It is possible to provide a luminaire using a semiconductor light emitting element as a light source, which can improve the efficiency, increase the transmittance of unnecessary portions, reduce luminance unevenness as a whole, and improve the efficiency of the fixture. .

  In addition, the reflector shape and reflection characteristics are designed so that brightness uniformity is obtained with respect to typical globe shapes, and for models with changed globe shapes, the transmittance of the globe is controlled to control the brightness. It is possible to reduce unevenness, and it is possible to provide a luminaire that can reduce costs by using common parts.

  According to the second aspect of the present invention, the long collimator lens disposed facing the light emitting direction of the semiconductor light emitting device irradiates the reflector with light, and efficiently uses the light to achieve uniformity. It is possible to provide a luminaire using a semiconductor light emitting element as a light source, which can increase the luminance unevenness as a whole and improve the fixture efficiency.

  According to the third aspect of the present invention, the collimator lens having a smooth incident surface and an exit surface having a substantially elliptical cross section having a first focal point at the center of the incident surface is used to irradiate the reflector with the light. It is possible to provide a lighting fixture using a semiconductor light-emitting element as a light source, which can be efficiently used to increase uniformity, reduce luminance unevenness as a whole, and improve fixture efficiency.

  According to the fourth aspect of the present invention, the semiconductor light emitting element is arranged such that the light emission center is located on the globe side with respect to the first focal point of the collimator lens, so that upward light is suppressed and luminance unevenness is suppressed. Thus, it is possible to provide a lighting fixture using a semiconductor light-emitting element as a light source, which can efficiently obtain a high degree of uniformity, can reduce luminance unevenness as a whole, and can improve the fixture efficiency.

  According to the invention described in claim 5, the simple structure in which the thickness of the glove becomes thinner as it goes from the outer edge portion to the central portion reduces luminance unevenness, improves the instrument efficiency, and further increases the cost. It is possible to provide a lighting fixture that suppresses the above.

  Hereinafter, embodiments of the lighting apparatus according to the present invention will be described.

  As shown in FIGS. 1 to 3, the lighting fixture of the present embodiment includes a fixture main body 10 installed on the fixture mounting surface A, a light source body 20 made of a semiconductor light emitting element, a lens body 30, a reflector 40, and a globe 50. Constitute.

  The instrument body 10 is configured as a chassis in which a metal such as an iron plate is painted white and has a square of about 500 mm on one side. A hook ceiling 11 installed on an instrument mounting surface A such as a ceiling is provided at a substantially central portion of the chassis. An adapter 12 that is detachably installed is provided. Further, a lighting device 13 for lighting the light source body 20 is attached to a space around the adapter 12, and installation portions 16 and 17 for installing the light source body 20 are provided on the outer edge portions 14 and 15 of the opposite sides. In the figure, reference numeral 18 denotes a remote control light receiving unit.

  The light source body 20 is composed of a semiconductor light emitting element, in this embodiment, a light emitting diode 21 (hereinafter referred to as “LED”), and a linear line having a plurality of LEDs 21 arranged on the light emitting element substrate 22 and having a linear length of about 100 mm. The light emitting module 23 is formed in the shape, and a required number, in this embodiment, five light emitting modules are selected to constitute one long light source body 20. Two long light source bodies 20 are prepared, and one LED 21 as a light emitting part is opposed to each of the installation parts 16 and 17 provided on the outer edge parts 14 and 15 of the opposite sides of the instrument body 10. In this way, it is disposed on the outer edge of the instrument body. That is, a support plate 24 integrally formed from the chassis is erected on the installation portions 16 and 17 of the instrument body, and the light emitting element substrate 22 of each light emitting module is attached to and supported by the support plate (FIG. 2). The support plate 24 also functions as a heat radiating plate of each LED 21, and each LED 21 and the lighting device 13 are placed in a space portion s formed between the rear surface of the support plate and the inner surface of the outer periphery of the globe 50 described later. A cord for wiring is stored.

  The lens body 30 is arranged in opposition to and close to the light emission direction of each LED 21, and is configured by a long convex lens that emits light from the LED as parallel light with a spread, and is separately supported by the support plate 24. It is attached with a tool (not shown). The lens body 30 is composed of a single long convex lens having a length of about 500 mm so that the five light emitting modules 23 having a length of about 100 mm (total length: about 500 mm) can be covered and disposed opposite to each other (see FIG. FIG. 3). Thereby, the joint portion of the joint of the five light emitting modules 23 having a length of about 100 mm can be covered by the long convex lens, and uniform light without unevenness is emitted from the lens body. The lens body 30 may be omitted when a lens is incorporated in each light emitting module 23 itself.

  The reflector 40 has a flat plate shape in which a metal such as an iron plate is coated with white, has both ends opposed to the LEDs 21 in the two light source bodies 20, and from an intermediate portion toward a substantially central portion of the instrument body. An inclined portion 41 that is continuously and gradually inclined is formed. The reflector is fixed to a substantially central portion of the chassis constituting the instrument body 10 by means such as screws or spot welding.

  The globe 50 is made of a translucent milky white translucent synthetic resin, and has a light emitting part 51 having a shallow dish-like spherical shape, and an outer peripheral part corresponding to the outer edge parts 14 and 15 of the instrument body 10. The opening 52 formed by opening the remaining upper surface is integrally formed, and is attached so as to surround the entire lower surface of the instrument body so as to cover the light source body 20 and the reflector 40 by covering from below the instrument body. . The globe 50 is formed such that its wall thickness decreases from the outer peripheral portion of the glove corresponding to the outer edge portions 14 and 15 of the instrument body 10 to the central portion, and the transmittance increases as it goes from the outer edge portion to the central portion. Configure to be The globe 50 is detachably attached to the outer edge portion of the instrument body by means of a known uneven engagement means, a mounting bracket or the like.

  The lighting fixture which consists of a ceiling light comprised as mentioned above is electrically connected by engaging the adapter 12 with the hook ceiling 11 provided on the fixture mounting surface A such as the ceiling, and engaging the adapter with the fixture body. At the same time, it is mechanically supported and installed (FIG. 1).

  When the lighting fixture installed above is turned on, each LED 21 of the light source body 20 emits light, and the light emitted from the LED is directed by the lens body 30 in a substantially parallel direction, that is, toward the inclined portion 41 of the reflector 40. The light is emitted and further reflected by a reflector so that the globe 50 is irradiated from the inner surface side, and the entire room is illuminated with substantially uniform brightness. At this time, the light source body 20 is disposed on the outer edge portions 14 and 15 of the instrument main body 10, and the annular fluorescent lamp does not exist in the central part of the instrument main body as in the related art. For this reason, a lamp image does not appear in the irradiation center part of a glove, but a uniformity improves. In addition, the globe 50 is formed such that the thickness thereof becomes thinner as it goes from the outer peripheral portion of the globe corresponding to the outer edge portions 14 and 15 of the instrument body 10 toward the central portion, and the transmittance is increased as it goes from the outer edge portion to the central portion. Therefore, it is possible to increase the diffusibility of the globe only in a portion where the luminance unevenness countermeasure is necessary and increase the transmittance in the unnecessary portion.

  That is, the outer edge portions 14 and 15 of the instrument body 10 are close to the light source, and the joint portion of the joint that forms a long light source body by connecting five linear light emitting modules 23 becomes a dark portion, Due to manufacturing variations, light leaks from the gap between the LED 21 and the lens body 30 and is emitted to the globe 50 to generate a bright line, and further, a cord for wiring the light source body 20 accommodated in the space portion s and the lighting device 13 Reflections and shadows are likely to appear, and this is a part that particularly requires measures against uneven brightness. Moreover, since the center part of the instrument main body 10 has the adapter 12 and the remote control light-receiving part 18, it is easy to become a dark part and it is desirable that the transmittance | permeability of a glove is high.

  As described above, the globe 50 according to the present embodiment has a thick outer peripheral portion of the globe corresponding to the outer edge portions 14 and 15 of the instrument body 10 that needs countermeasures against luminance unevenness. It can eliminate dark areas, leaking light emission lines, and code images. In addition, since the thickness of the central portion where high transmittance is required is reduced, the dark portion of the adapter 12 and the remote control light receiving portion 18 is also eliminated, the luminance unevenness as the entire globe can be reduced, and the uniformity can be further improved. As in the past, it is not necessary to reduce the luminance unevenness by reducing the transmittance of the entire globe, and the efficiency of the appliance can be increased.

  Further, the heat generated from each LED 21 is transmitted from the light emitting element substrate 22 of each light emitting module 23 to the chassis having a large area through the support plate 24 formed integrally with the chassis, and is efficiently radiated.

  A space portion s is formed between the support plate 24 supporting the light source 20 of the instrument body 10 and the outer peripheral portion of the globe 50, which tends to be a dark portion, but the outer peripheral portion of the globe has a thickness as described above. Since it is formed thick, the dark part becomes inconspicuous. Moreover, although the heat generated from each LED 21 is concentrated in the space portion s and the temperature tends to be high, discoloration and deformation due to heat are prevented because the thickness of the glove in this portion is thick.

  The lighting fixtures described above correspond to a number of globe-shaped models and lineups that match the atmosphere of the room as follows.

  That is, the shape and reflection characteristics of the reflector 40 in the lighting fixture are designed so that the luminance uniformity is obtained with respect to a typical glove shape such as a popular model, and for a model in which the glove shape is changed in design. The reflector is used in common by controlling the transmittance of the globe itself. The transmittance of the globe 50 can be controlled, for example, by means of changing the thickness of the globe described above, or even by changing the transmittance by forming a gradation by screen printing to change the transmittance. Alternatively, it may be formed by changing the density of the diffusion part due to the uneven part or the like. Thereby, the reflector 40 can be made common to each model in the lineup, and development costs and component costs can be reduced.

  As described above, according to the present embodiment, the outer peripheral portion of the globe 50 corresponding to the outer edge portions 14 and 15 of the instrument body 10 that needs countermeasures against luminance unevenness is made thick, and the thickness of the central portion that requires high transmittance is made thin. As a result, luminance unevenness is reduced as a whole, and the instrument efficiency can be increased. Further, the heat generated from each LED 21 is transmitted to the chassis having a large area via the support plate 24 and efficiently radiated.

  Since the space portion s is formed between the support plate 24 that supports the light source body 20 of the instrument body 10 and the outer peripheral portion of the globe 50, it can be used as a storage space for wiring cords and the like. Moreover, although this space part s tends to become a dark part, since the outer peripheral part of the glove corresponding to the space part is formed thick, the dark part becomes inconspicuous. Moreover, although the heat generated from each LED 21 is concentrated in the space portion s and the temperature tends to be high, discoloration, deformation, and the like due to heat can be prevented because the thickness of the globe 50 in this portion is thick. Furthermore, since the outer periphery of the globe 50 is thick, the strength of the opening edge of the opening 52 is increased, and a durable glove that is not easily damaged even when the globe is attached or detached during maintenance or inspection is provided. Can do.

  The reflector 40 can be used in common for each model in the lineup, and a lighting fixture that is advantageous in terms of cost can be provided.

  As described above, in this embodiment, the lens body 30 is configured by one long convex lens having a length of about 500 mm so that all the five light emitting modules 23 can be covered and disposed. Even if it divides | segments and comprises, it may comprise further dividing | segmenting into 5 corresponding to each light emitting module 23. FIG.

  Although the support plate 24 that supports the light source body 20 of the instrument body 10 is formed integrally with the chassis, it may be formed of a separate support plate made of aluminum or the like. Also in this case, by attaching the support plate to the chassis, the LED is thermally connected and can also perform the heat dissipation action of the LED.

  Although the square lighting fixture is comprised and the two light source bodies 20 are arrange | positioned in the outer edge parts 14 and 15 which oppose, a total of four light sources may be arrange | positioned to each four sides. Further, a round lighting fixture may be configured, and the light emitting module 23 may be connected in a ring shape to form a light source body, which may be disposed over the entire periphery of the outer edge portions 14 and 15 of the fixture main body 10.

  Although the lighting fixture is configured as a pendant type ceiling light, it may be configured as a ceiling-mounted ceiling light, or may be configured as various types of lighting fixtures for facilities such as offices and businesses.

  In the present embodiment, the lens body of the lighting fixture is configured by a collimator lens in which the focused light is converted into non-aberration parallel light and exits the lens.

  The configuration will be described below with reference to FIGS. In addition, in each figure, the same code | symbol is attached | subjected to the same part as Example 1, and detailed description is abbreviate | omitted.

  As shown in FIGS. 4 to 6, the lighting fixture includes a fixture main body 10 installed on the fixture mounting surface A, a light source body 20 composed of LEDs 21, and a long collimator lens arranged facing the light emission direction of the LEDs. 60, similar to the first embodiment, the reflector 40 is opposed to the LED 21 of the light source body 20 and is inclined toward the substantially central portion of the instrument body 10, and the globe 50 covers the light source body 20 and the reflector 40. Unlike the first embodiment, the globe 50 in the present embodiment is configured with a uniform wall thickness as a whole.

  As shown in FIG. 6A, the collimator lens 60 includes a smooth incident surface 61, an exit surface 62 having a substantially elliptical cross section having a first focal point a at the center of the incident surface, and upper and lower portions of the incident surface. And the support portions 64 and 64 integrally formed on both sides of the recess. As shown in FIG. 5, the collimator lens 60 emits light from the first focal point a of the incident surface as a non-aberration parallel light and is emitted from an emission surface 62 having a substantially elliptical cross section.

  As shown in FIG. 6 (b), the collimator lens 60 having the above-described configuration has a length of about 100 mm so as to cover and face all five light emitting modules 23 (about 500 mm in total length) having a length of about 100 mm. Two 250 mm long collimator lenses 60 are prepared. Thereby, the joint portion of the joint of the five light emitting modules 23 having a length of about 100 mm can be covered by the long collimator lens 60, and uniform light without unevenness is emitted from the collimator lens 60.

  In the two collimator lenses 60, the light emission center b of each LED 21 in the light source body 20 is on the globe side by a predetermined dimension c from the first focal point a of the collimator lens 60 (upper in FIG. 5, lower in FIG. 6 (a)). And is disposed so as to be in contact with the smooth incident surface 61. The collimator lens 60 is attached to and supported by the surface side of the light emitting element substrate 22 of each light emitting module 23 using the support portions 64 and 64.

  Two light source bodies 20 composed of the LED 21 and the collimator lens 60 configured as described above are prepared, and in the same manner as in the first embodiment, the installation portions 16 and 17 provided on the outer edge portions 14 and 15 of the opposite sides of the instrument body 10 are provided. One by one, the LEDs 21 as light emitting parts are arranged on the outer edge of the instrument body so as to face each other, and the globe 50 is covered so as to cover the reflector 40 configured in the same manner as in the first embodiment. The instrument is configured (FIG. 4). As described above, the globe 50 is configured with a uniform thickness unlike the first embodiment.

  In addition, wiring cords for electrically connecting each of the five light emitting modules, connecting parts for connection, and the like are accommodated in the concave portions 63, 63 formed in the triangular cross section formed on the incident surface of the collimator lens 60. Constitute.

  In the lighting fixture configured as described above, the uniformity of the fixture was measured by experiment. That is, as shown in FIG. 5, the light emission center b of each LED 21 in the light source body 20 has a predetermined dimension c (y plus direction and y minus direction (glove side (in FIG. 5) in relation to the first focal point a of the collimator lens 60). The degree of uniformity was measured by decentering in the upward direction and the anti-globe direction (downward in FIG. 5).

  The results are shown in Table 1. When the LED center line position (dimension c) is about 0.5 mm (No. 5), the uniformity is the best, and the light emission center b of the LED whose center line position is 0 mm coincides with the first focus a of the collimator lens. Compared with the case (No. 3), it is understood that the uniformity is improved by about 10%. In addition, it can be understood that when it is decentered to the opposite side (y minus direction), it is reduced by about 10%. Furthermore, the degree of homogeneity decreases as the glove is further decentered in the y-plus direction.

  Further, when the LED center line position is decentered as described above, the light flux on the center line xx (FIG. 1B) orthogonal to the light source axis from the light source side θ1 to the center side θ20 of the globe is measured. did. The result is shown in the graph of FIG. From this result, it can be understood that the uniformity is the best when the LED center line position (dimension c) is about 0.5 mm (No. 5).

上記の実験結果から明らかなように、本実施例の照明器具を点灯すると、均斉度が良好となってグローブ全体としての輝度ムラが低減し、均斉度を一層向上させることができ、従来のように、グローブ全体の透過率を下げて輝度ムラを低減する必要がなくなり器具効率を上げることができる。

As is clear from the above experimental results, when the lighting fixture of this example is turned on, the uniformity is good, the luminance unevenness of the entire globe is reduced, and the uniformity can be further improved. In addition, it is not necessary to reduce the luminance unevenness by lowering the transmittance of the entire globe, so that the instrument efficiency can be increased.

  In particular, since the collimator lens 60 is used as the lens body, in which the focused light becomes the aberration-free parallel light and exits the lens, the light from the light source is efficiently used by irradiating the front reflector without waste. In addition, the desired uniformity can be obtained easily and reliably. Furthermore, since upward light (on the opposite side of the globe) is suppressed by the collimator lens 60, luminance unevenness is suppressed, and the uniformity can be obtained efficiently. And since it can carry out without changing the transmittance | permeability of the globe 50, an effective uniformity can be obtained by a simpler means.

  Further, as performed in the above-described experiment, it is possible to control light distribution by decentering the LED center position, in other words, the position of the light source. Incidentally, when the beam is decentered toward the globe side (upper side in FIG. 5) with respect to the focal point a of the collimator lens 60, the light is directed downward, and when decentered toward the anti-globe side (lower side in FIG. 5), the light is directed upward. It is clear from the above experiment.

  As described above, in this embodiment, the collimator lens 60 is configured by two long lenses having a length of about 250 mm so as to cover all the five light emitting modules 23 and face each other. Similarly to the above, it may be configured by one lens having a length of 500 mm, or may be further divided into five corresponding to each light emitting module. The concave portions 63 and 63 having a triangular cross section formed on the incident surface of the collimator lens 60 may be omitted.

  Further, the collimator lens 60 in this embodiment is used in place of the convex lens 30 in the first embodiment, and the uniformity is improved by controlling the transmittance of the globe itself in the first embodiment while improving the uniformity by the collimator lens 60. You may comprise so that a more reliable uniformity may be acquired combining an improvement means.

  Other configurations, operations, operational effects, modifications, and the like in this embodiment are the same as those in the first embodiment.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the present invention.

The lighting fixture which concerns on 1st embodiment of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is the top view of the state which removed the glove. Sectional drawing which expands and similarly shows the outer edge part of the fixture main body of a lighting fixture. The front view of the light source body of a lighting fixture similarly. The longitudinal cross-sectional view of the lighting fixture which concerns on 2nd embodiment of this invention. Sectional drawing for demonstrating the characteristic of the collimator lens of a lighting fixture similarly. Similarly, the support part of the collimator lens of a lighting fixture is shown, (a) is a perspective view which cuts out a part and shows it, and (b) is a front view. The graph which similarly shows the experimental result of a lighting fixture and shows the uniformity from the light source side θ1 to the center side θ20 of the globe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Instrument main body 14,15 Outer edge part 21 Semiconductor light emitting element 30 Lens body 40 Reflector 50 Globe

Claims (5)

An instrument body;
A semiconductor light emitting device disposed on the outer edge of the instrument body;
A lens body disposed opposite to the light emitting direction of the semiconductor light emitting element and controlling light of the semiconductor light emitting element mainly in a parallel direction;
A reflector facing the semiconductor light emitting element and inclined toward a substantially central portion of the fixture body;
A glove that covers the semiconductor light emitting element and the reflector and has a higher transmittance as it goes from the outer edge to the center;
The lighting fixture characterized by comprising. An instrument body;
A semiconductor light emitting device disposed on the outer edge of the instrument body;
A long collimator lens disposed facing the light emitting direction of the semiconductor light emitting device;
A reflector facing the semiconductor light emitting element and inclined toward a substantially central portion of the fixture body;
A globe covering the semiconductor light emitting element and the reflector;
The lighting fixture characterized by comprising. The collimator lens comprises a smooth entrance surface;
An exit surface having a substantially elliptical cross section having a first focal point at the center of the entrance surface;
The lighting fixture according to claim 2, comprising: The lighting device according to claim 2, wherein the semiconductor light emitting element is disposed such that a light emission center thereof is positioned on a globe side with respect to a first focal point of a collimator lens. The lighting fixture according to any one of claims 1 to 4, wherein the glove has a thickness that decreases with increasing thickness from the outer edge to the center.

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