JP2010157495A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a lighting fixture capable of suppressing deterioartion of a fixture efficiency to obtain sufficient brightness as a base lighting and suppressing uncomfortable glare. <P>SOLUTION: The lighting fixture is provided with a light source (5) emitting light from a ceiling to a floor, a translucent cover (4) arranged below the light source (5), and a light shielding angle setting element (8) for setting up a light shielding angle (α1) against the light emitted from the light source (5). The light shielding angle setting element (8) determines an incidence area (11) where the light emitted from the light source (5) to the translucent cover (4) is made incident directly. In the incidence area (11) of the translucent cover (4), there is arranged a first reflection element (13), which (13) reflects at least a part of the light incident from the light source (5) to the incidence area (11). The light reflected by the first reflection element (13) is reflected toward a periphery of the incidence area (11) of the translucent cover (4) by a second reflection element (6). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire that emits light from a ceiling toward a floor. More specifically, the present invention relates to a structure for sufficiently ensuring brightness while suppressing unpleasant glare when looking up at a lighting fixture.

Luminaires used for indoor general lighting have been promoted to save energy with a target of 10 W / m ² . In order to realize energy saving of the luminaire, it is necessary to improve the light emission efficiency of the light source itself and to efficiently extract the light emitted from the light source as illumination light.

  For example, light emitting diodes are more efficient and have a longer life compared to existing light sources such as fluorescent lamps and incandescent lamps. The luminous efficiency of light emitting diodes tends to increase year by year, and it is predicted that the luminous efficiency will reach 200 lm / W in the future. With increasing output of light emitting diodes, lighting fixtures for general lighting using light emitting diodes as light sources have recently been provided. When light is emitted from the ceiling to the floor with a lighting fixture using light emitting diodes, it is necessary to regularly arrange a large number of light emitting diodes in order to obtain sufficient brightness as base lighting.

  However, the light-emitting diode is a point light source having a light-emitting portion whose shape is smaller than that of an existing light source such as a fluorescent lamp. For this reason, a lighting fixture using a high-intensity light emitting diode tends to give a person unpleasant glare when the person looks up at the lighting fixture.

  In the luminaire disclosed in Patent Document 1, a translucent or milky white translucent cover having light diffusibility is disposed below the light emitting diode in order to suppress unpleasant glare.

JP 2007-214081 A

  However, the translucent cover inevitably reduces the instrument efficiency because it prevents light transmission. More specifically, the light emitting diodes are point light sources with strong light directivity, and are regularly arranged with a space between them, so that when a person visually recognizes the light emitting diodes that are lit, the light emitting diodes stand out. . Therefore, in order to suppress the luminance of the light-emitting diode that can be seen through the translucent cover to the same level as that of a conventional fluorescent lamp, it is necessary to use a translucent cover having a deeper color tone. Thereby, although glare is eased, the instrument efficiency of a lighting fixture falls to 20 to 40%.

  Furthermore, it is known that light that has a light distribution angle of 60 ° or more is a cause of unpleasant glare during desk work performed in an office or the like, and this light is reduced to suppress glare. This is one of the issues.

  An object of the present invention is to obtain a lighting fixture that can suppress a decrease in fixture efficiency and obtain sufficient brightness as base lighting, and can suppress discomfort glare.

  To achieve the above object, a lighting apparatus according to one aspect of the present invention includes a light source that emits light from a ceiling toward a floor; a translucent cover that is disposed below the light source and faces the light source; A light shielding angle setting means for setting a light shielding angle with respect to the light emitted from the light source, thereby defining a direct-lighting area in which the light emitted from the light source is directly incident on the translucent cover; A first reflecting means disposed in the direct area of the translucent cover and reflecting at least part of the light incident on the direct area from the light source; and the light reflected by the first reflecting means; Second reflecting means for reflecting toward the periphery of the direct area of the translucent cover.

  The lighting fixture according to one aspect of the present invention can be applied as a ceiling-mounted fixture, a ceiling-embedded fixture, or an optical ceiling. Further, a plurality of lighting fixtures having the above-described configuration may be arranged side by side on the ceiling, so that one lighting system may be configured by the plurality of lighting fixtures. At the same time, a plurality of lighting modules obtained by combining a plurality of lighting fixtures with each other may be prepared, and these lighting modules may be arranged side by side on the ceiling.

As a light source of the lighting fixture, a high-intensity light emitting diode can be used. The size of the luminaire, for example in the case of using the light emitting diode of 4W when using light emitting diodes of about 100 mm ^2, 1W can be about 50 mm ^2.

  The light source of the luminaire includes a plurality of light emitting diodes. The light emitting diodes are distributed and emit light from the ceiling toward the floor. The light emitting diode itself may emit white light, and when the element emits blue light or ultraviolet light, the blue light or ultraviolet light is wavelength-converted with a phosphor to emit white light. You may comprise. Furthermore, it is good also as a structure which radiates | emits white light by combining several light emitting diodes which emit a mutually different color so that the relationship of the three primary colors of light or a complementary color relationship may be satisfy | filled.

  The translucent cover of the lighting fixture is disposed below the light source so as to face the light source. The translucent cover may be independent for each light source, or may be independent for each lighting module obtained by combining a plurality of light sources into a unit. Furthermore, the translucent cover can be configured to be shared by a plurality of illumination modules. The translucent cover may be transparent or may have light diffusibility. When the translucent cover has light diffusibility, the translucent cover desirably has a relatively high linear transmittance so that the interior of the lighting fixture can be seen through.

  It is desirable that the light-blocking angle setting means of the lighting fixture sets a desired light-blocking angle within a range of 45 ° or more with respect to the horizontal plane, for example, in order to perform general lighting suitable mainly for offices. The light blocking angle setting means controls the light distribution so that the illuminance of the light receiving surface that receives light from the direct area of the translucent cover is optimal for work in an office, for example.

  That is, the direct-light region exists within a cut-off angle range represented by a value obtained by subtracting the light blocking angle from 90 °. For example, when the light shielding angle is 45 °, the cutoff angle is 45 °. The illumination within the cut-off angle range is mainly performed by light emitted directly from the light source. If the cut-off angle is 45 °, light distributed at a light distribution angle of 45 ° or less mainly contributes to office lighting.

  The 1st reflection means of a lighting fixture reflects at least one part of the light from the light source which goes to the direct irradiation area | region of a translucent cover. Due to the presence of the first reflecting means, the luminance of the direct area of the translucent cover can be reduced to a desired value. Thereby, when a person looks up at the translucent cover from right below, it becomes impossible to look directly at the light source, and unpleasant glare can be reduced. As the first reflecting means, the following known means can be appropriately selected and employed.

  (i) A semi-transmissive reflective film is laminated over substantially the entire direct area. Due to the presence of the semi-transmissive reflective film, part of the light from the light source incident on the semi-transmissive reflective film is transmitted through the direct areas of the semi-transmissive reflective film and the translucent cover, and the remaining light is semi-transmissive reflected. Reflected by the film.

  (ii) A reflective film having a large number of dot-like patterns is laminated in the direct-light region. The dot-like patterns are dispersed with a space between each other, and there are gaps between adjacent patterns. Therefore, when light from the light source enters the pattern, the light is reflected without passing through the reflective film. When light from the light source is incident on the gap between the patterns, the light is transmitted through the direct areas of the reflective film and the translucent cover.

  (iii) A semi-transmissive reflective film having a large number of dot-like patterns is laminated in the direct-light region.

  (iv) A translucent reflective film or a reflective film having a number of dot-like patterns on the inner surface of the translucent cover that faces the light source, the outer surface of the translucent cover that is exposed to the outside of the luminaire, or the translucent property Laminate inside the cover.

  The semi-transmissive reflective film and the reflective film having a large number of dot-like patterns can be formed of a material such as a metal vapor deposition film and a printing film mainly composed of metal oxide fine particles. Furthermore, you may form a dot-like pattern by printing white resin on the inner surface or outer surface of a translucent cover, for example.

  The light reflected by the second reflecting means of the luminaire enters the periphery of the direct-light region of the translucent cover. Most of the light incident on the periphery of the direct area passes through the translucent cover without causing reflection. That is, the light which goes to the circumference | surroundings of a direct irradiation area | region can be taken out effectively as light for illumination, and the fall of appliance efficiency can be suppressed.

  The second reflecting means has a function of reflecting light reflected by the first reflecting means downward. Therefore, it is preferable that the second reflecting means has a configuration suitable for efficiently reflecting light so that the degree of uniformity is high. For example, when a reflecting surface is employed as the second reflecting means, the reflecting surface may be a mirror surface and a rotating quadratic surface such as a paraboloid. When the reflecting surface is a rotating quadric surface, the axis of the rotating quadratic surface is arranged substantially parallel to the vertical line, or is inclined at an acute angle away from the vertical line in the direction of the light source. can do. Thereby, the light quantity radiated | emitted to the circumference | surroundings of a direct irradiation area | region increases, and the uniformity of the illumination with respect to the circumference | surroundings of a direct irradiation area | region can be raised.

  According to the lighting fixture of the present invention, the light blocking angle setting means includes the reflecting cylinder. The reflecting tube has a first opening end that is opened toward the direct-lighting region of the translucent cover, and a second opening end that is located on the opposite side of the first opening end. . A light source is disposed at the second opening end so that light is emitted from the first opening end toward the translucent cover, and a light blocking angle is set by the first opening end of the reflecting tube. Is set. The inner surface of the reflecting cylinder is a light reflecting surface. The light reflection surface may be either a mirror surface or a diffuse reflection surface. Furthermore, the cross-sectional shape of the reflecting cylinder is not limited to a circle but may be a square.

  According to the lighting fixture of the present invention, the second reflecting means sets a light blocking angle with respect to the light emitted from the first opening end of the reflecting tube, and this light blocking angle is the first light blocking member of the reflecting tube. It is smaller than the light blocking angle set by the opening end. Specifically, for example, if the light shielding angle set by the first opening end is 45 °, the light shielding angle set by the second reflecting means can be 30 °. Thereby, the discomfort glare when a person looks up at a lighting fixture in the position away from the optical axis of the light source can be suppressed.

  According to the lighting fixture of the present invention, the first reflecting means has such a reflection characteristic that the light reflected toward the second reflecting means decreases as the distance from the optical axis of the light source increases. As a result, as the distance from the optical axis increases, the ratio of the light transmitted through the translucent cover increases, and the luminance distribution in the direct-light region is leveled.

  In order to achieve the above object, a lighting apparatus according to another aspect of the present invention includes a plurality of light sources regularly arranged to emit light from a ceiling toward a floor; and disposed below the light sources. A light-transmitting cover facing the light source; and an opening end for radiating light from the light source toward the light-transmitting cover, and a first light shielding for the light emitted from the light source by the opening end. By setting an angle, a first light shielding angle setting means for defining a plurality of direct-light areas on which light emitted from the light source is directly incident on the light-transmitting cover, and the direct light of the light-transmitting cover A first reflecting means disposed in a region and reflecting at least a part of light incident on the direct-light region from the light source; and the light reflected by the first reflecting means on the direct-light of the translucent cover Second to reflect towards the perimeter of the area A second light shielding angle setting means for setting a second light shielding angle smaller than the first light shielding angle with respect to light emitted from the opening end of the first light shielding angle setting means; It has. The second light shielding angle is determined by a line segment from the opening end of the first light shielding angle setting means toward the translucent cover, and this line segment is around the direct-lighting region corresponding to the adjacent light source. At the same time, it deviates from the first reflecting means arranged in the adjacent direct area.

  In the luminaire according to another aspect of the present invention, the light emitted from the opening end of the first light blocking angle setting means is guided around the direct area corresponding to the adjacent light source and taken out below the luminaire. Can do. In other words, the light emitted from the end of the opening need not be reflected by the first reflecting means corresponding to the adjacent light source. Therefore, it is possible to prevent light loss from occurring on the translucent cover, and the ratio of light transmitted through the translucent cover increases.

  According to the lighting fixture of the present invention, the translucent cover has a plurality of peripheral regions that individually surround the direct-light region, and the line segment that defines the second light blocking angle reaches the peripheral region corresponding to the adjacent light source. Yes. Thereby, the light radiated | emitted from the opening edge part of the 1st light-shielding angle setting means can permeate | transmit a surrounding area | region, and can be taken out below a lighting fixture.

  In the luminaire of the present invention, the intersection where the line segment defining the second light shielding angle intersects the translucent cover is located at the boundary between the direct-light region corresponding to the adjacent light source and the peripheral region. According to this structure, the light radiated | emitted from the opening edge part of the 1st light shielding angle setting means can permeate | transmit the whole peripheral region, and can be taken out under the translucent cover. At the same time, unnecessary multiple reflections on the translucent cover can be prevented, and light traveling toward the peripheral region can be efficiently extracted as illumination light.

  According to the first aspect of the present invention, it is possible to obtain sufficient brightness as base lighting while suppressing unpleasant glare and suppressing a decrease in appliance efficiency.

  According to the second aspect of the present invention, light can be emitted from the first opening end of the reflecting tube as the light shielding angle setting means toward the translucent cover, and the brightness feeling as the base lighting is further improved. To do.

  According to the invention of claim 3, when a person looks up at the luminaire at a position away from directly below the light source, the light emitted from the first opening end of the reflecting tube becomes difficult to enter the eyes, and unpleasant glare is caused. Can be reduced.

  According to the invention of claim 4, the luminance distribution in the direct-light region can be leveled, and the light can be sufficiently extracted even at a position away from the optical axis, which contributes to an improvement in the feeling of brightness.

  According to the fifth aspect of the present invention, it is possible to prevent the loss of light on the translucent cover and increase the ratio of light transmitted through the translucent cover. Therefore, the light reflected by the second reflecting means can be effectively taken out as illumination light.

  According to invention of Claim 6, the light reflected by the 2nd reflection means can be taken out effectively as light for illumination, and the instrument efficiency of a lighting fixture can be improved.

  According to the seventh aspect of the present invention, the light traveling toward the peripheral area of the translucent cover can be efficiently extracted as illumination light, which contributes to an improvement in the feeling of brightness.

Sectional drawing of the lighting fixture which concerns on embodiment of this invention. The top view of the lighting fixture which concerns on embodiment of this invention. Sectional drawing which shows the optical path of the light which reflects in the embodiment of this invention and the light which passes a translucent cover, and a semi-transmissive reflective film.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 discloses a luminaire 1 that is directly attached to a ceiling, for example, used for indoor general lighting. The luminaire 1 includes a substrate 2, a reflector assembly 3, and a translucent cover 4.

  The board | substrate 2 is accommodated in the fixture main body of the lighting fixture 1, for example, is arrange | positioned horizontally so that it may become parallel to a ceiling. The lower surface of the substrate 2 is a flat mounting surface 2a. A plurality of light emitting diodes 5 are mounted on the mounting surface 2 a of the substrate 2. The light emitting diodes 5 are an example of a light source, and are regularly arranged in a matrix on the mounting surface 2 a of the substrate 2.

  According to the present embodiment, each light emitting diode 5 has at least one semiconductor light emitting element that emits blue light having a wavelength of, for example, 460 nm, and a sealing member that molds the semiconductor light emitting element. The sealing member is formed of a transparent silicone resin that is an example of a light-transmitting material, and, for example, yellow phosphor particles are mixed in the sealing member.

  Blue light emitted from the semiconductor light emitting element is incident on the transparent sealing member. Part of the blue light incident on the sealing member is absorbed by the yellow phosphor particles. The remaining light passes through the sealing member without hitting the phosphor particles. The phosphor particles that have absorbed blue light emit yellow light by wavelength conversion. As a result, yellow light and blue light are mixed to form white light, and the white light is emitted from the light emitting diode 5.

  Further, the light emitting diode 5 has an optical axis O1 along the light emission direction. The optical axis O1 passes through the center of the light emitting diode 5 and extends in the vertical direction.

  The reflector assembly 3 is disposed below the substrate 2. The reflector assembly 3 has a plurality of reflecting mirrors 6 corresponding to the light emitting diodes 5. As shown in FIG. 2, the plurality of reflecting mirrors 6 have a circular shape when viewed from below, and are regularly arranged so as to correspond to the positions of the light emitting diodes 5. Each reflecting mirror 6 has a light reflecting surface 7. The light reflecting surface 7 is a rotating quadratic curved surface such as a paraboloid, for example, and has a shape that is expanded toward the lower side of the substrate 2 so as to obtain a desired light distribution.

  As shown in FIG. 1, each reflecting mirror 6 includes a cylindrical reflecting tube 8. The reflecting cylinder 8 is an example of a first light blocking angle setting unit, and is arranged coaxially with respect to the reflecting mirror 6. The reflection tube 8 has a first opening end 8a and a second opening end 8b. The first opening end 8 a is opened at the center of the light reflecting surface 7. The second opening end 8b is located on the opposite side of the first opening end 8a and faces the mounting surface 2a of the substrate 2. Further, the inner surface of the reflecting tube 8 is a light reflecting surface 10. The light reflecting surface 10 connects the first opening end 8a and the second opening end 8b.

  The light emitting diode 5 mounted on the substrate 2 is located at the second opening end 8 b of the reflecting cylinder 8. The light emitted from the light-emitting diode 5 is guided into the reflecting tube 8 from the second opening end 8b and is radiated from the first opening end 8a downward to the reflecting mirror 6. The first opening end 44 a of the reflecting tube 8 protrudes downward from the light emitting diode 5. Therefore, the first opening end portion 8a of the reflecting tube 8 sets a first light blocking angle α1 that blocks the light emitting diode 5 from being directly viewed when a person looks up at the lighting fixture 1 from a position outside the optical axis O1. is doing. In the present embodiment, the first light blocking angle α1 is 45 ° or more.

  The translucent cover 4 is made of a translucent material based on, for example, a transparent silicone resin. The translucent cover 4 covers the reflector assembly 3 and the plurality of light emitting diodes 5 from below.

  As shown in FIG. 1, as the first light shielding angle α <b> 1 is set at the first opening end 8 a of the reflecting tube 8, the direct-light region 11 and the peripheral region 12 are respectively formed on the translucent cover 4. It is prescribed. The direct irradiation region 11 is a region where light emitted from the light emitting diode 5 is directly incident. In other words, the direct-light region 11 is a region determined by a cut-off angle β obtained by subtracting the first light shielding angle α1 from 90 °, and is located directly under each light-emitting diode 5. The optical axis O <b> 1 of the light-emitting diode 5 is orthogonal to the direct-light region 11 at the center of the direct-light region 11.

  The peripheral area 12 surrounds the direct area 11. The peripheral region 12 faces the outer peripheral portion of the light reflecting surface 7 of the reflecting mirror 6. Therefore, the direct irradiation region 11 and the reflection region 12 exist for each of the plurality of reflection mirrors 6 and are regularly arranged so as to face the reflection mirror 6.

  As shown in FIG. 1, the translucent cover 4 has an inner surface 4 a that faces the reflector assembly 3 and the light emitting diode 5. A plurality of semi-transmissive reflective films 13 are laminated on the inner surface 4 a of the translucent cover 4. The semi-transmissive reflective film 13 is an example of a first reflecting means, and is located in the direct-light region 11 so as to face the light emitting diode 5. For this reason, the semi-transmissive reflective films 13 are regularly arranged at intervals so as to correspond to the light-emitting diodes 5.

  As shown in FIG. 3, the semi-transmissive reflective film 13 includes a large number of dot-like patterns 15 having light reflectivity. The pattern 15 is dense at the center of the direct-light region 11 through which the optical axis O1 of the light-emitting diode 5 passes, and becomes rougher as the distance from the optical axis O1 increases. In other words, the interval between the patterns 15 increases as the distance from the center of the direct-light region 11 increases toward the outer periphery.

  When the light from the light emitting diode 5 is incident on the direct irradiation region 11 of the translucent cover 4, a part of the incident light hits the pattern 15 as shown by the solid line arrow in FIG. Reflected toward the reflecting surface 7. Most of the remaining light incident on the direct-light region 11 passes between the patterns 15 and reaches the light-transmitting cover 4 and is transmitted through the light-transmitting cover 4 as indicated by broken-line arrows. The light traveling toward the light reflecting surface 7 is reflected by the light reflecting surface 7 and guided to the peripheral region 12 of the translucent cover 4. Therefore, in the present embodiment, the reflecting mirror 6 functions as a second reflecting means.

  The pattern 15 of the semi-transmissive reflective film 13 is denser at the center of the direct-light region 11 than at the outer periphery of the direct-light region 11. For this reason, the reflective performance of the semi-transmissive reflective film 13 is high in the central portion of the direct-light region 11, and the reflective performance of the semi-transmissive reflective film 13 is lowered as it goes in the direction of the outer peripheral portion of the direct-light region 11. That is, the semi-transmissive reflective film 13 has a reflection characteristic such that light reflected toward the light reflecting surface 7 decreases as the distance from the optical axis O1 of the light emitting diode 5 increases.

  Therefore, the luminance in the direct-light region 11 is moderately lowered by the reflection action of the semi-transmissive reflective film 13. Thereby, the brightness | luminance of the direct irradiation area | region 11 becomes high continuously as it goes to the direction of an outer peripheral part from the center part of the direct irradiation area | region 11.

  The semi-transmissive reflective film 13 is laminated only on the direct-light region 11, and the semi-transmissive reflective film 13 does not exist in the peripheral region 12 surrounding the direct-light region 11. Thereby, the linear transmittance of the direct region 11 is lower than the linear transmittance of the peripheral region 12.

  As shown in FIG. 1, the outer peripheral edge 6 a of each reflecting mirror 6 is an example of a second light shielding angle setting unit, and is more transparent to the translucent cover 4 than the first opening end 8 a of the reflecting tube 8. It sticks out. The outer peripheral edge 6a of the reflecting mirror 6 hides the first opening end 8a of the reflecting tube 8 from the first opening end 8a when a person looks up at the lighting fixture 1 from a position off the optical axis O1. A second light blocking angle α2 that blocks emitted light is set. The second light shielding angle α2 is, for example, 30 ° and is smaller than the first light shielding angle α1.

  As shown in FIG. 1, the second light blocking angle α2 is determined by a line segment A connecting the first opening end 8a of the reflecting tube 8 and the outer peripheral edge 6a of the reflecting mirror 6. If it is below the line segment A, the light radiated from the first opening end 8 a of the reflecting cylinder 8 is directed to the translucent cover 4.

  The plurality of direct areas 11 and the plurality of peripheral areas 12 defined on the translucent cover 4 are regularly arranged so as to correspond to the positions of the plurality of reflecting mirrors 6. Therefore, in the present embodiment, the line segment A extending from one reflecting mirror 6 enters below the other reflecting mirror 6 adjacent thereto. Thereby, the intersection B where the line segment A intersects the translucent cover 4 is located at the boundary between the direct-light region 11 and the peripheral region 12 located immediately below the other adjacent reflecting mirror 6.

  According to such a configuration, the light emitted from the light emitting diode 5 is radiated from the first opening end portion 8 a of the reflecting tube 8 toward the direct irradiation region 11 of the translucent cover 4. A part of the light incident on the direct-light region 11 hits the pattern 15 of the semi-transmissive reflective film 13 and is reflected toward the light reflecting surface 7 of the reflecting mirror 6 as shown by an arrow in FIG.

  The light reflected by the semi-transmissive reflective film 13 is reflected again by the light reflecting surface 7 of the reflecting mirror 6 and travels toward the peripheral region 12 of the translucent cover 4. The light traveling toward the peripheral region 12 passes through the translucent cover 4 and is emitted below the lighting fixture 1.

  In the luminaire 1 according to the embodiment of the present invention, the semi-transmissive reflective film 13 is laminated on the direct irradiation region 11 of the translucent cover 4 into which the light emitted from the light emitting diode 5 is directly incident. Due to the presence of the semi-transmissive reflective film 13, the luminance of the direct area 11 is suppressed. Furthermore, since the outer peripheral edge 6a of the reflecting mirror 6 defines the second light shielding angle α2, even when a person looks up from the position away from the luminaire 1, the first opening end of the reflecting tube 8 is provided. The light emitted from 8a becomes difficult to enter the eyes directly. As a result, unpleasant glare when a person looks up at the lighting apparatus 1 can be reduced.

  In addition, the light reflected by the semi-transmissive reflective film 13 is reflected again by the light reflecting surface 7 of the reflecting mirror 6 toward the translucent cover 4 and is incident on the peripheral region 12 of the translucent cover 4. The The light incident on the peripheral region 12 passes through the translucent cover 4 without being reflected and is emitted below the lighting fixture 1. As a result, the light reflected by the semi-transmissive reflective film 13 can be effectively extracted as illumination light, and the appliance efficiency of the lighting fixture 1 can be increased.

  At the same time, the semi-transmissive reflective film 13 has a reflecting performance that decreases from the central portion of the direct-light region 11 to the outer peripheral portion. Therefore, the ratio of light passing through the translucent cover 4 is reduced in the outer peripheral portion of the direct-light region 11. Increase. For this reason, the efficiency of the instrument is improved and light can be sufficiently extracted even at a position deviated from the optical axis O1.

  Furthermore, the intersection B between the line segment A that defines the second light blocking angle α2 and the translucent cover 4 is positioned at the boundary between the direct-light region 11 and the peripheral region 12 that correspond directly below the adjacent reflecting mirror 6. Yes. For this reason, the light radiated | emitted from the 1st opening edge part 8a of the reflection cylinder 8 can permeate | transmit the peripheral area | region 12 corresponding to the adjacent reflecting mirror 6, and can be taken out below the lighting fixture 1. FIG.

  In other words, when the intersection point B is located in the direct-light region 11 corresponding to the adjacent reflecting mirror 6, a part of the light emitted from the first opening end 8 a of the reflecting tube 8 is applied to the adjacent reflecting mirror 6. The light is reflected by the corresponding semi-transmissive reflective film 13. As a result, light loss occurs and the proportion of light transmitted through the peripheral region 12 decreases.

  Therefore, the second light blocking angle α2 is desirably set to an angle at which the intersection B of the line segment A is located within the range of the peripheral region 12 corresponding to the adjacent reflecting mirror 6. Thereby, it is possible to prevent multiple reflection of light on the inner surface 4a of the translucent cover 4.

  In addition, according to the above configuration, since the semi-transmissive reflective film 13 is provided in the direct-light region 11 of the translucent cover 4, the light-emitting diode 5 is not directly recognized. That is, in the case of the light-emitting diode 5 using a yellow phosphor, yellow is conspicuous when turned off. However, by adopting a configuration in which the light emitting diode 5 cannot be directly visually recognized, the color of the light emitting diode 5 becomes inconspicuous when the light is turned off.

  INDUSTRIAL APPLICABILITY The present invention can obtain sufficient brightness as base lighting while suppressing unpleasant glare, and can be effectively utilized as an office or general household lighting device that emits light from the ceiling toward the floor.

  DESCRIPTION OF SYMBOLS 4 ... Translucent cover, 5 ... Light source (light emitting diode), 6 ... 2nd reflection means (reflecting mirror), 6a ... 2nd light-shielding angle setting means (outer peripheral part), 8 ... 1st light-shielding angle setting Means (reflective cylinder), 8a ... open end (first open end), 11 ... direct-light region, 13 ... first reflective means (semi-transmissive reflective film), A ... line segment.

Claims (7)

A light source that emits light from the ceiling toward the floor;
A translucent cover disposed below the light source and facing the light source;
A light blocking angle setting means for setting a light blocking angle with respect to the light emitted from the light source, thereby defining a direct-lighting area in which the light emitted from the light source is directly incident on the translucent cover;
A first reflecting means disposed in the direct area of the translucent cover and reflecting at least a part of the light incident on the direct area from the light source;
Second reflecting means for reflecting light reflected by the first reflecting means toward the periphery of the direct area of the translucent cover;
A lighting fixture comprising:   The light blocking angle setting means includes a first opening end that opens toward the direct area of the translucent cover, and a second opening end that is located on the opposite side of the first opening end. The light source is disposed at the second opening end of the reflecting tube so that light is emitted from the first opening end toward the translucent cover, and the reflection is performed. The lighting apparatus according to claim 1, wherein the light blocking angle is set by the first opening end of the tube.   The second reflecting means sets a light shielding angle with respect to light emitted from the first opening end of the reflecting cylinder, and the light shielding angle is determined by the first opening end of the reflecting cylinder. The lighting fixture according to claim 2, wherein the lighting fixture is smaller than the set light shielding angle.   4. The first reflecting means according to claim 1, wherein the first reflecting means has a reflection characteristic such that light reflected toward the second reflecting means decreases as the distance from the optical axis of the light source decreases. The lighting fixture as described in any one of. A plurality of light sources regularly arranged to emit light from the ceiling toward the floor;
A translucent cover disposed below the light source and facing the light source;
An opening end that radiates light from the light source toward the translucent cover, and setting the first light shielding angle with respect to the light emitted from the light source by the opening end, A plurality of first light-shielding angle setting means for defining a plurality of direct-irradiation areas on which the light emitted from the light source is directly incident on the protective cover;
A first reflecting means disposed in the direct area of the translucent cover and reflecting at least a part of the light incident on the direct area from the light source;
Second reflecting means for reflecting light reflected by the first reflecting means toward the periphery of the direct area of the translucent cover;
Second light shielding angle setting means for setting a second light shielding angle smaller than the first light shielding angle with respect to light emitted from the opening end of the first light shielding angle setting means;
The second light shielding angle is determined by a line segment from the opening end of the first light shielding angle setting means toward the translucent cover, and this line segment is around the direct-lighting region corresponding to the adjacent light source. And a lighting fixture that is out of the first reflecting means disposed in the adjacent direct-lighting region.   The translucent cover has a plurality of peripheral regions that individually surround the direct-light region, and the line segment that defines the second light shielding angle reaches the peripheral region corresponding to an adjacent light source. The lighting fixture according to claim 5.   The intersection at which the line segment defining the second light shielding angle intersects the translucent cover is located at a boundary between the direct-light region corresponding to an adjacent light source and the peripheral region. Item 7. A lighting apparatus according to item 6.

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