JP6371946B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device including a light guide.

  In the illumination device described in Patent Literature 1, a plurality of substrates are arranged along the light incident surface (end surface) of a rectangular light guide plate (light guide). A plurality of LEDs are provided on the mounting surface of the substrate. The substrate stands upright with respect to the light output surface (main surface) of the light guide plate, and the mounting surface of the substrate faces the light incident surface of the light guide plate. The LED is a top-emitting LED (top view LED). The top-emitting LED emits light in a direction perpendicular to the mounting surface of the substrate.

  Generally, when the distance between the light incident surface of the light guide plate and each LED varies, light and darkness (brightness unevenness) occurs in the light emitted from the light guide plate. In the illuminating device described in Patent Literature 1, since the light guide plate is rectangular, the light incident surface of the light guide plate is a flat surface, and the substrate can be arranged in parallel to the light incident surface of the light guide plate. Therefore, the distance between the light incident surface of the light guide plate and each LED is uniform, and the occurrence of light and darkness of the emitted light can be suppressed.

JP 2013-232344 A

  However, the lighting device described in Patent Document 1 has the following problems. That is, since the vertically upright substrate is flat, when the light incident surface of the light guide plate includes a curved surface, the distance between the light incident surface of the light guide plate and each LED becomes uneven, and the brightness of the emitted light Will occur. Therefore, the light incident surface of the light guide plate is required to be flat, and the design of the lighting device is restricted.

  On the other hand, by arranging the same number of vertically upstanding substrates as the plurality of LEDs, it is possible to suppress the occurrence of light and darkness of the emitted light. However, the substrate positioning operation and the operation for connecting the substrates become complicated as the number of substrates increases, and the number of steps increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an illumination device capable of reducing design restrictions while easily suppressing the occurrence of light and darkness of light emitted from a light guide. .

The lighting device disclosed in the present application includes a light guide, at least one substrate, a plurality of light emitting elements, and a housing. The light guide has a light incident surface and a light exit surface intersecting the light incident surface, the substrate has a mounting surface, and is disposed along the light incident surface of the light guide. , Provided on the mounting surface of the substrate. The substrate is mounted on the housing. The mounting surface of the substrate is along the light exit surface of the light guide. The housing includes a cover and a base on which convex portions are formed. The substrate has a recess or a hole formed on an outer end surface of the substrate, the projection fits into the recess or the hole, and the substrate is sandwiched between the cover and the base. The inner end surface of the substrate is in contact with the light incident surface of the light guide .

  In the illumination device disclosed in the present application, each of the plurality of light emitting elements emits light along the mounting surface of the substrate.

  In the lighting device disclosed in the present application, it is preferable that the light incident surface of the light guide is subjected to a light diffusion treatment.

  In the lighting device disclosed in the present application, it is preferable that a film is formed on the light exit surface of the light guide.

  In the lighting device disclosed in the present application, the number of the substrates is preferably plural.

  In the illumination device disclosed in the present application, it is preferable that the light exit surface of the light guide has a circular shape, and the light guide has a disk shape.

  In the illumination device disclosed in the present application, each of the plurality of light emitting elements preferably emits light toward the center of the light guide.

A lighting device disclosed in the present application, wherein the housing preferably has an electrical insulating property.

A lighting device disclosed in the present application, before Kikatamitai has an opening in which the light guide is arranged, the light incident surface of the light guide body comprises a curved surface, inner end surface of the substrate, the It is preferable to include a curved surface along the light incident surface of the light guide.

  ADVANTAGE OF THE INVENTION According to this invention, the restriction | limiting of the design of an illuminating device can be reduced, suppressing generation | occurrence | production of the brightness of the emitted light from a light guide easily.

It is a perspective view of the illuminating device which concerns on embodiment of this invention. It is a perspective view which shows the state which removed the light guide from the illuminating device which concerns on embodiment of this invention. It is sectional drawing along the III-III line of FIG. (A)-(e) It is typical sectional drawing explaining the positional relationship of the light guide and board | substrate of the illuminating device which concerns on embodiment of this invention. It is sectional drawing along the VV line of FIG. It is sectional drawing along the VI-VI line of FIG. It is a perspective view which shows the illuminating device which concerns on the modification of embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated.

  FIG. 1 is a perspective view of a lighting device 1 according to an embodiment of the present invention. The lighting device 1 includes a disk-shaped lamp body 3 and a support member 5. The lamp body 3 includes an annular casing 7 having electrical insulation and a light guide 9 fixed to the casing 7. In the present embodiment, the light guide 9 is a light guide plate and has a disk shape. The support member 5 supports the lamp body 3 and is fixed to, for example, an indoor or outdoor wall. In this embodiment, the X axis and the Y axis are parallel to the horizontal plane, and the Z axis is parallel to the vertical axis. The X axis, the Y axis, and the Z axis are orthogonal to each other.

  FIG. 2 is a perspective view showing a state in which the light guide 9 is removed from the lighting device 1. The housing 7 has a circular opening 23 in which the light guide 9 is disposed. The opening 23 penetrates the casing 7 in the Z-axis direction. The light guide 9 has a pair of light exit surfaces 41 and light entrance surfaces 43. In FIG. 2, only one of the pair of light exit surfaces 41 appears. The pair of light exit surfaces 41 are a pair of main surfaces of the light guide 9. The light incident surface 43 is an end surface of the light guide 9. The light incident surface 43 is subjected to light diffusion processing. In this embodiment, the light diffusion process is roughening. The light incident surface 43 of the light guide 9 includes a curved surface. In the present embodiment, the light incident surface 43 is a curved surface that forms a circumference.

  A dot pattern in which a plurality of circular dots are formed with white ink is printed on at least one of the pair of light output surfaces 41. The dot pattern has translucency that transmits and diffuses incident light. In the dot pattern, the circular dots formed near the radial center of the light guide 9 have the largest area, and the circular dots formed near the radial outermost periphery of the light guide 9 have the smallest area. A plurality of circular dots are formed between the radial center of the light guide 9 and the radially outermost periphery so that the area of each circular dot gradually decreases from the radial center of the light guide 9 toward the outside. ing. In FIG. 1, the lamp body 3 is horizontal, but in FIG. 2, the lamp body 3 rotates around the rotation shaft 15.

  FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 and shows a cross section of the lamp body 3 cut along a horizontal plane passing through the light guide 9. The lamp body 3 further includes a plurality of substrates 13 and a plurality of light emitting elements 11. In the present embodiment, the plurality of substrates 13 are two arc-shaped substrates 13. Each of the substrates 13 has a mounting surface 14, an arc-shaped outer end surface 35, and an arc-shaped inner end surface 37. The mounting surface 14 is one of a pair of main surfaces of the substrate 13. The inner end surface 37 includes a curved surface along the light incident surface 43 of the light guide 9. In the present embodiment, the inner end surface 37 is a curved surface that forms a substantially semicircular circumference.

  The two substrates 13 are arranged in an annular shape along the light incident surface 43. In the present specification, the meaning that the substrate 13 is arranged along the light incident surface 43 means that all or part of the inner end surface 37 faces the light incident surface 43 and the light incident surface 43. The inner end surface 37 is substantially parallel to the light incident surface 43 and the inner end surface 37 is inclined at an acute angle with respect to the light incident surface 43 in a sectional view without depending on whether or not they are in contact with each other. Including that. Moreover, in this specification, substantially parallel includes parallel.

  With reference to FIG. 4A to FIG. 4E, a configuration in which the substrate 13 is disposed along the light incident surface 43 is illustrated. 4A to 4E schematically correspond to the cross section taken along line VV in FIG. 1 and schematically show a cross section of the lamp body 3 cut along a vertical plane passing through the light emitting element 11. . In FIG. 4A to FIG. 4E, oblique lines indicating cross sections are omitted for simplification of the drawings.

  In FIG. 4A, the inner end surface 37 is substantially parallel to the light incident surface 43, and the entire inner end surface 37 faces and contacts the light incident surface 43. However, the inner end surface 37 may not be in contact with the light incident surface 43. In FIG. 4B, the inner end surface 37 is substantially parallel to the light incident surface 43, and a part of the inner end surface 37 faces and contacts the light incident surface 43. However, the inner end surface 37 may not be in contact with the light incident surface 43.

  In FIG. 4C, the inner end surface 37 is substantially parallel to the light incident surface 43, the entire inner end surface 37 is not opposed to the light incident surface 43, and the substrate 13 is in contact with the light guide 9. ing. However, the substrate 13 may not be in contact with the light guide 9. In FIG. 4D, the inner end surface 37 is substantially parallel to the light incident surface 43, the entire inner end surface 37 does not face the light incident surface 43, and a part of the mounting surface 14 is the light output surface 41. Opposite and abutting. However, the mounting surface 14 may not be in contact with the light exit surface 41.

  In FIG. 4 (e), the inner end surface 37 is inclined at an acute angle with respect to the light incident surface 43, a part of the inner end surface 37 faces the light incident surface 43, and the substrate 13 faces the light guide 9. It is in contact. However, the entire inner end surface 37 may face the light incident surface 43, and the substrate 13 may not be in contact with the light guide 9. The inclination angle α of the inner end surface 37 with respect to the light incident surface 43 is an acute angle. The inclination angle α is preferably greater than 0 degree and 45 degrees or less, for example. For example, the inclination angle α is more preferably greater than 0 degree and 30 degrees or less.

  The upper limit value of the inclination angle α is exemplified as 45 degrees and 30 degrees. However, the upper limit value of the inclination angle α is at least an angle at which light emitted from the light emitting element 11 can enter the light incident surface 43 of the light guide 9. The value is not limited to the exemplified angle, and may be an angle larger than 45 degrees, for example.

  When a later-described side-emitting LED (Light Emitting Diode) is used as the light emitting element 11, most of the light emitted from the light emitting element 11 is incident on the light incident surface 43 of the light guide 9 when the inclination angle α is 90 degrees. Since it does not enter, it lacks utility as a lighting fixture. Therefore, as the inclination angle α is less than 90 degrees and the inclination angle α is further reduced, the light emitted from the light emitting element 11 is more likely to be incident on the light incident surface 43, so that the utility as a lighting fixture increases. .

  For example, when a side-emitting LED having a directivity angle of 120 degrees is used as the light emitting element 11, when the inclination angle α is set to 45 degrees, the light efficiency is about 65%, and the light efficiency that can be practically used can be secured. When the angle is set to 30 degrees, the light efficiency is about 85%, and higher practicality can be secured. The light efficiency is a ratio of light incident on the light incident surface 43 to light emitted from the light emitting element 11.

  4A to 4E, the cross-sectional shape of the inner end surface 37 is a linear shape, but may be an arbitrary shape, for example, a curved shape.

  Referring to FIG. 3 again, in the present embodiment, the plurality of light emitting elements 11 are, for example, 60 LEDs. The plurality of light emitting elements 11 are arranged at equal intervals along the inner end surfaces 37 of the two substrates 13. Half of the light emitting elements 11 among the plurality of light emitting elements 11 are provided on the mounting surface 14 of one substrate 13, and the remaining half of the light emitting elements 11 are provided on the mounting surface 14 of the other substrate 13.

  In the present embodiment, each light emitting element 11 is an SMD (Surface Mount Device) in which an LED chip and a phosphor are unitized and placed on the mounting surface 14 of the substrate 13 and electrically connected to the conductive pattern of the substrate 13. ) Type LED. Each light emitting element 11 may be a COB (Chip on Board) type LED in which an LED chip is placed on the mounting surface 14 of the substrate 13 and sealed with a phosphor.

  Details of the light guide 9, the substrate 13, and the light emitting element 11 will be described with reference to FIG. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 1, and shows a cross section of the lamp body 3 cut along a vertical plane passing through the light emitting element 11.

  The housing 7 is mounted with the substrate 13 and holds the light guide 9 and includes a base 7L and a cover 7U. The pair of light exit surfaces 41 of the light guide 9 intersect the light incident surface 43. The pair of light exit surfaces 41 are substantially parallel surfaces facing each other, and are circular in a plan view. In the present embodiment, the light exit surface 41 is orthogonal to the light entrance surface 43. The light exit surface 41 is hard-coated and a film 44 is formed. In addition, illustration of the film 44 is abbreviate | omitted in FIG.1, FIG2 and FIG.4.

  The mounting surface 14 of the substrate 13 is along the light exit surface 41 and is substantially parallel to the light exit surface 41. The inner end surface 37 of the substrate 13 is in contact with the light incident surface 43 of the light guide 9. Further, in order to suppress unevenness in brightness, the mounting surface 14 of the substrate 13 is preferably painted in a color that easily reflects or diffuses light (for example, white).

  In this specification, the meaning that the mounting surface 14 is along the light exit surface 41 means whether a part of the mount surface 14 faces the light exit surface 41 and whether it is in contact with the light exit surface 41. The mounting surface 14 is substantially parallel to the light output surface 41 and the mounting surface 14 is inclined at an acute angle with respect to the light output surface 41 in a cross-sectional view.

  With reference to FIG. 4A to FIG. 4E, a configuration in which the mounting surface 14 is along the light exit surface 41 is illustrated. 4A to 4C, the mounting surface 14 is substantially parallel to the light output surface 41, and the mounting surface 14 does not face or abut the light output surface 41. The substrate 13 is in contact with the light guide 9, but may not be in contact with the light guide 9.

  In FIG. 4D, the mounting surface 14 is substantially parallel to the light output surface 41, and a part of the mounting surface 14 faces and contacts the light output surface 41. However, the mounting surface 14 may not be in contact with the light exit surface 41.

  In FIG. 4E, the mounting surface 14 is inclined at an acute angle with respect to the light output surface 41, and the mounting surface 14 is not opposed to or in contact with the light output surface 41. The substrate 13 is in contact with the light guide 9, but may not be in contact with the light guide 9. The inclination angle β of the mounting surface 14 with respect to the light exit surface 41 is an acute angle. The inclination angle β is preferably greater than 0 degree and 45 degrees or less, for example. For example, the inclination angle β is more preferably greater than 0 degree and 30 degrees or less. For example, the inclination angle β is equal to the inclination angle α.

  Although the upper limit value of the inclination angle β is exemplified as 45 degrees and 30 degrees, the upper limit value of the inclination angle β is at least an angle at which light emitted from the light emitting element 11 can enter the light incident surface 43 of the light guide 9. The value is not limited to the exemplified angle, and may be an angle larger than 45 degrees, for example.

  When a side-emitting LED is used as the light emitting element 11, most of the light emitted from the light emitting element 11 does not enter the light incident surface 43 of the light guide 9 when the tilt angle β is 90 degrees. Lack of practicality. Therefore, as the inclination angle β is less than 90 degrees and the inclination angle β is further reduced, the light emitted from the light emitting element 11 is more likely to enter the light incident surface 43, so that the utility as a lighting fixture increases. .

  For example, when a side-emitting LED having a directivity angle of 120 degrees is used as the light emitting element 11, if the inclination angle β is set to 45 degrees, the light efficiency is about 65%, and the light efficiency that can be practically used can be secured. When the angle is set to 30 degrees, the light efficiency is about 85%, and higher practicality can be secured.

  Referring to FIG. 5 again, the distance between each of the light emitting elements 11 and the light incident surface 43 is a constant distance d, which is uniform. The light emitting surface of the light emitting element 11 faces the light incident surface 43 toward the radial center of the light guide 9. The light emitting element 11 emits light along the mounting surface 14 of the substrate 13. For example, the light emitting element 11 emits light more strongly in a direction parallel to the direction perpendicular to the mounting surface 14 of the substrate 13. That is, in the present embodiment, the light emitting element 11 is a side light emitting LED (side view type LED).

  Each of the plurality of light emitting elements 11 emits light toward the center of the light guide 9. That is, each of the light emitting elements 11 emits light toward the light incident surface 43 toward the radial center of the light guide 9. The light exit surface 41 of the light guide 9 emits light incident from the light incident surface 43. Specifically, the light emitted from the plurality of light emitting elements 11 enters the light guide 9 from the light incident surface 43. At this time, since the light incident surface 43 is roughened, the light diffused by the light incident surface 43 enters the light guide 9. The light incident on the light guide 9 propagates through the light guide 9 while being internally reflected by the light guide 9. Of the light incident on the inside of the light guide 9, the light reaching the dot pattern formed on the light exit surface 41 is diffused while passing through each circular dot and emitted from the pair of light exit surfaces 41.

  As described above, as described with reference to FIGS. 1 to 5, according to the present embodiment, when the plurality of light emitting elements 11 are provided on the mounting surface 14 of the substrate 13, the mounting surface of the substrate 13 is also provided. 14 is along the light exit surface 41 of the light guide 9. Therefore, by forming and arranging the substrate 13 along the light incident surface 43 of the light guide 9, the increase in the number of the substrates 13 is suppressed, and the light incident surface 43 of the light guide 9 and each light emitting element 11 are The distance between them can be made uniform. In addition, it is easy to cut out the substrate 13 from the original substrate so that the inner end surface 37 of the substrate 13 is along the light incident surface 43 of the light guide 9. As a result, it is possible to reduce the design constraints of the lighting device 1 while easily suppressing the occurrence of light and darkness (brightness unevenness) in the light emitted from the light guide 9.

  Further, as described with reference to FIG. 1, according to the present embodiment, the housing 7 has electrical insulation. Therefore, it is possible to reduce the thickness of the lamp body 3 while ensuring a prescribed insulation distance (creeping distance) with respect to the light emitting element 11. The insulation distance is the shortest distance between the conductive parts sandwiching the insulator. The insulation distance with respect to the light emitting element 11 is the shortest distance between one of the pair of terminals (anode and cathode) of the light emitting element 11 and the other conductive portion of the lamp body 3. When the casing 7 has conductivity, it is required to increase the thickness of the casing 7 so that the casing 7 and the light emitting element 11 do not approach each other in order to ensure a specified insulation distance. However, since the housing 7 has electrical insulation, the housing 7 can be made thin without affecting the insulation distance.

  The housing 7 is made of, for example, a synthetic resin having electrical insulation. Since it is a synthetic resin, weight reduction of the lamp main body 3 is realizable. In addition, a large number of light emitting elements 11 are provided to increase the amount of light while reducing the amount of heat released by reducing the current supplied to each light emitting element 11. Further, by providing a large number of light emitting elements 11 and reducing the interval between the adjacent light emitting elements 11, the light (darkness unevenness) of the light emitted from the plurality of light emitting elements 11 can be suppressed. The brightness (unevenness of brightness) of the light emitted from the light source is suppressed.

  Furthermore, as described with reference to FIG. 2, according to the present embodiment, the light incident surface 43 of the light guide 9 is subjected to light diffusion processing. Therefore, the light emitted from each light emitting element 11 is diffused and enters the light guide 9. As a result, the light emitted from the region near the plurality of light emitting elements 11 (that is, the substantially annular region) in the light exit surface 41 of the light guide 9 is the central region in the light exit surface 41 of the light guide 9. It can be suppressed from becoming darker than the light emitted from (that is, a substantially circular region). That is, unevenness in brightness of the light guide 9 can be suppressed.

  In addition, when the light emitting element 11 is comprised by LED, since the light emitted from LED is a straight line and its irradiation angle is small, the light quantity in the area | region between the adjacent light emitting elements 11 is insufficient. As a result, brightness unevenness may occur in the light guide 9. Therefore, a light diffusion process is performed on the light incident surface 43. The irradiation angle of light incident on the inside of the light guide 9 through the light incident surface 43 that has been subjected to the light diffusion process is increased, and an insufficient amount of light in the region between the adjacent light emitting elements 11 can be reduced. As a result, unevenness in the brightness of the light guide 9 can be suppressed.

  Furthermore, as described with reference to FIG. 3, according to the present embodiment, the plurality of substrates 13 are arranged along the light incident surface 43 of the light guide 9. Therefore, compared to the case where a single annular substrate is mounted, it is less affected by variations in the external dimensions of the substrate, and the contact accuracy between the light incident surface 43 and the inner end surface 37 of the substrate 13 can be increased. As a result, the accuracy of the distance d between the light incident surface 43 and each light emitting element 11 can be increased. That is, the variation in the distance d can be reduced with respect to the plurality of light emitting elements 11, and the occurrence of light / darkness (unevenness in brightness) of the light emitted from the light guide 9 can be further suppressed.

  In addition, when a single annular substrate is mounted, if the processing accuracy is low, it may occur that the substrate does not fit into the light guide 9, but by preparing a plurality of substrates 13, the light guide The substrate 13 can be arranged along the nine light incident surfaces 43. Furthermore, since the substrate 13 has an arc shape, more substrates 13 can be cut out from the original substrate than to cut out one annular substrate from the original substrate. Therefore, the yield is good and the portion to be discarded on the original substrate can be reduced.

  In general, the positioning operation of the substrates 13 and the operation of connecting the substrates 13 become complicated as the number of substrates 13 increases, and the number of man-hours increases. On the other hand, in this embodiment, two substrates 13 are mounted. Accordingly, it is possible to suppress an increase in the number of man-hours while increasing the mounting accuracy of the substrate 13 and the light emitting element 11 and increasing the number of cutouts of the substrate 13 from the original substrate.

  Further, according to the present embodiment, the plurality of light emitting elements 11 are arranged at equal intervals around the light guide body 9. Therefore, it is possible to further suppress the occurrence of light and darkness (unevenness in brightness) of the light emitted from the light guide 9.

  Furthermore, as described with reference to FIGS. 4 and 5, according to the present embodiment, the substrate 13 is arranged inside the lamp body 3 with the mounting surface 14 along the light exit surface 41 of the light guide 9. Has been. Therefore, the lamp body 3 can be made thinner than the case where the substrate stands and the mounting surface of the substrate faces the light incident surface of the light guide. Further, as shown in FIG. 5, the inner end surface 37 of the substrate 13 and the light emitting element 11 face the light incident surface 43 of the light guide 9, and the substrate 13 and the light emitting element 11 are more light guide than the light emitting surface 41. By arranging the substrate 13 and the light emitting element 11 so as not to protrude in the thickness direction 9, the lamp body 3 can be thinned.

  Moreover, according to this embodiment, the light emitting element 11 is a side light emitting LED. Therefore, even when the mounting surface 14 is along the light exit surface 41, the light emitted from the light emitting element 11 can be easily guided to the light incident surface 43.

  Furthermore, according to the present embodiment, the coating 44 is formed on the light exit surface 41 of the light guide 9. As a result, costs can be reduced, quality can be improved, light efficiency can be improved, and man-hours can be reduced as compared with the case where the protective sheet is attached to the light exit surface 41 while protecting the light guide 9. The light efficiency is, for example, the ratio of the intensity of light emitted from one or both of the pair of light output surfaces 41 to the intensity of light emitted from the plurality of light emitting elements 11.

  That is, since it is not necessary to prepare a protective sheet, the cost of the lighting device 1 can be reduced. In addition, when a protective sheet is attached, gas may enter between the protective sheet and the light exit surface 41, but by forming the coating 44, the gas may enter between the coating 44 and the light exit surface 41. Can be suppressed. Therefore, the occurrence of light and darkness (unevenness in brightness) in the light emitted from the light exit surface 41 is suppressed, and the quality of the lighting device 1 is improved. Further, when the protective sheet is attached, the outgoing light from the light exit surface 41 is absorbed by the protective sheet, but by forming the coating 44, the absorption of the outgoing light can be suppressed and the light efficiency of the lighting device 1 can be improved. . Furthermore, since the process of attaching the protective sheet can be reduced, the number of steps for assembling the lighting device 1 can be reduced.

  The coating 44 is made of, for example, an organic coating agent (for example, melamine resin, urethane resin, or acrylic resin), a silicon coating agent (for example, silane compound), or an inorganic coating agent (for example, metal oxide).

  Furthermore, according to the present embodiment, the light guide 9 has a pair of light exit surfaces 41 facing each other. Accordingly, each of the pair of light exit surfaces 41 emits light. As a result, it is possible to perform illumination different from the case of having one light exit surface. Each of the light emitting elements 11 emits light toward the center of the light guide 9. Therefore, the occurrence of light and darkness (unevenness in brightness) in the light emitted from the light exit surface 41 is further suppressed.

  Next, the detail of the illuminating device 1 is demonstrated. The support member 5 will be described with reference to FIG. The support member 5 includes a universal joint 50. Therefore, the lamp body 3 can be arbitrarily rotated, and the light exit surface 41 can be directed in an arbitrary direction. As a result, light can be emitted in any direction.

  In this embodiment, the universal joint 50 is a biaxial hinge mechanism. Specifically, the universal joint 50 includes a rotating shaft 15, a U-shaped support part 51, and a pair of plate-like support parts 53. The rotating shaft 15 is fixed to the lamp body 3 and is substantially parallel to the light exit surface 41 (see FIG. 1) of the light guide 9. The rotating shaft 15 extends along the radial direction of the light guide 9 from the side surface of the housing 7 toward the outside of the lamp body 3.

  The rotary shaft 15 is supported by the support portion 51 so as to be rotatable around the axis A1. As a result, the lamp body 3 can rotate about the axis A1. The support portion 51 is disposed between the pair of support portions 53 and is supported by the pair of support portions 53 so as to be rotatable around the axis A2. As a result, the lamp body 3 can rotate around the axis A2.

  The circumferential positioning of the substrate 13 will be described with reference to FIG. The circumferential direction of the substrate 13 is a direction along the circumferential direction of the light guide 9. A plurality of cylindrical protrusions 19 are formed on the base 7 </ b> L of the housing 7. The plurality of convex portions 19 are arranged along the outer end surfaces 35 of the two substrates 13 arranged in an annular shape. Each substrate 13 has a plurality of recesses 31 formed in the outer end surface 35. The convex part 19 fits into the concave part 31. As a result, the movement along the circumferential direction of each substrate 13 is restricted, and the position along the circumferential direction of the substrate 13 is determined. Each substrate 13 may have a corner portion 33 formed on the outer end surface 35, and the base 7 </ b> L of the housing 7 may have a convex portion 20 corresponding to the corner portion 33. The convex portion 20 is in contact with the corner portion 33. The corner 33 is an example of a recess.

  The vertical and radial positioning of the substrate 13 will be described with reference to FIGS. The radial direction of the substrate 13 indicates a direction along the radial direction of the light guide 9. As shown in FIG. 3, a plurality of ribs 17 are formed on the cover 7U of the housing 7 along the inner peripheral surface of the cover 7U. The rib 17 extends along the radial direction of the light guide 9 toward the light guide 9. The tips of the ribs 17 are located on the outer side in the radial direction than the light emitting element 11 with respect to the light guide 9.

  FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 1 and shows a cross section of the lamp body 3 cut along a vertical plane passing through the rib 17. The substrate 13 is sandwiched between the base 7L and the cover 7U. Specifically, the substrate 13 is sandwiched between the base 7L and the ribs 17 of the cover 7U. As a result, the movement of each substrate 13 along the vertical direction is restricted, and the position along the vertical direction of each substrate 13 is determined. Further, by bringing each substrate 13 into contact with the convex portion formed on the base 7L and the light incident surface 43 of the light guide 9, movement along the radial direction of each substrate 13 is restricted, and The position along the radial direction is determined.

  The positioning of the light guide 9 will be described with reference to FIG. The inner end surface 37 of each substrate 13 is in contact with the light incident surface 43 of the light guide 9. As a result, the movement of the light guide 9 along the radial direction is restricted, and the position of the light guide 9 along the radial direction is determined. The light guide 9 is sandwiched between the base 7L and the cover 7U. As a result, the position along the vertical direction of the light guide 9 is determined. Furthermore, the movement of the light guide 9 along the circumferential direction is restricted by the contact of the substrate 13 and the clamping between the base 7L and the cover 7U. As a result, the position along the circumferential direction of the light guide 9 is determined.

  As described above, as described with reference to FIGS. 3 and 6, according to the present embodiment, the convex portion 19 of the base 7L is fitted into the concave portion 31 of the substrate 13, and the substrate 13 is covered with the base 7L and the cover. The substrate 13 is positioned by sandwiching it with 7U. In addition, the light guide 9 is positioned by bringing the inner end surface 37 of the substrate 13 into contact with the light incident surface 43 of the light guide 9. Therefore, the substrate 13 and the light guide 9 can be positioned without using screws. As a result, it is possible to reduce the number of parts and the number of assembly steps.

  FIG. 7 is a perspective view showing an illuminating device 1 according to a modification of the present embodiment. The illuminating device 1 which concerns on this modification is provided with the hanging member 60 instead of the support member 5 of the illuminating device 1 which concerns on this embodiment. The suspension member 60 is fixed to a fixture 65 (for example, a flange) fixed to the ceiling, and suspends the lamp body 3. The suspension member 60 includes a plurality of linear members 61. The linear member 61 is, for example, a wire, a cord, or a chain. The material of the linear member 61 is, for example, metal and / or synthetic resin. The lighting device 1 includes a power cable 63 that supplies a power supply voltage to each light emitting element 11 (see FIG. 3). 1 to 6, illustration of the power cable is omitted. In FIG. 7, the coating 44 (see FIG. 5) is not shown.

  As described above with reference to FIGS. 1 to 7, according to the present embodiment (hereinafter, this modification is included), the mounting surface 14 of each substrate 13 becomes the light exit surface 41 of the light guide 9. Therefore, the design restriction of the lighting device 1 can be reduced while easily suppressing the occurrence of light and darkness (brightness unevenness) in the light emitted from the light guide 9.

  The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 7). However, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof (for example, (1) to (8) shown below). In order to facilitate understanding, the drawings schematically show each component as a main component, and the thickness, length, number, and the like of each component shown in the drawings are different from the actual for convenience of drawing. In some cases. Moreover, the shape, dimension, etc. of each component shown by said embodiment are an example, Comprising: It does not specifically limit, A various change is possible in the range which does not deviate substantially from the effect of this invention.

  (1) In this embodiment, although the light guide 9 is circular shape, the shape of the light guide 9 is not limited and is arbitrary. For example, the light guide 9 may have a polygonal shape. For example, the light guide 9 may be annular or polygonal. In this case, the outer end surface of the light guide 9 may be the light incident surface 43, and the inner end surface of the light guide 9 may be the light incident surface 43.

  Specifically, in the present embodiment, the light incident surface 43 is a curved surface forming a circumference, but can take an arbitrary shape. For example, the light incident surface 43 of the light guide 9 may be formed of a single or a plurality of arbitrary curved surfaces, a plurality of arbitrary flat surfaces, a single or a plurality of curved surfaces and a single or It may be formed with a plurality of flat surfaces.

  (2) Even when the light incident surface 43 of the light guide 9 has an arbitrary shape, the inner end surface 37 of the substrate 13 is formed in a shape along the shape of the light incident surface 43. In the present embodiment, the two substrates 13 are mounted. However, the light incident surface 43 of the light guide 9 may be surrounded by one substrate or three or more substrates.

  (3) In the present embodiment, the housing 7 is annular and the opening 23 is circular, but the shapes of the housing 7 and the opening 23 are not limited and are arbitrary. Moreover, although the lamp body 3 is fixed to the wall by the support member 5 or fixed to the ceiling by the suspension member 60, the lamp body 3 may be fixed at an arbitrary place by an arbitrary member or instrument. Moreover, the lamp main body 3 may be arrange | positioned so that a movement is possible.

  (4) In the present embodiment, the light-emitting element 11 is a side-emitting LED, but a top-emitting LED can also be adopted. In this case, an optical system for guiding the light of the light emitting element 11 to the light incident surface 43 is provided.

  (5) In the present embodiment, the light incident surface 43 is roughened, but the light diffusion process is not limited to the roughening, and may be, for example, a process for forming a film or a chemical process.

  (6) In this embodiment, although the suitable example of each component of the illuminating device 1 was shown, the light-diffusion process can be abbreviate | omitted as needed. Further, the coating 44 may not be formed on the light exit surface 41. For example, a protective sheet may be attached to the light exit surface 41. Further, the housing 7 may not have electrical insulation. For example, the housing 7 may be made of metal. In this case, the heat dissipation effect can be improved.

  (7) In the present embodiment, the substrate 13 has a plurality of recesses 31, but may have a plurality of holes instead of the recesses 31. The hole portion may or may not penetrate the substrate 13. The convex portion 19 of the base 7L is fitted into the hole. The substrate 13 may have a recess 31 and a hole, and the base 7L may have a protrusion 19 corresponding to the recess 31 and the hole.

  Moreover, in this embodiment, although the board | substrate 13 and the light guide 9 are positioned without using a screw, you may position the board | substrate 13 and / or the light guide 9 with fixing members, such as a screw.

  (8) In the present embodiment, the pair of main surfaces of the light guide 9 is the pair of light output surfaces 41, but one of the pair of main surfaces may be the light output surface 41. In this case, a reflective element may be formed or attached to the other of the pair of main surfaces. Moreover, although the light guide 9 is a light guide plate, it is not limited to plate shape, For example, cylindrical shape, prismatic shape, cube shape, or a rectangular parallelepiped shape may be sufficient.

  The present invention can be used in the field of an arbitrary lighting device arranged indoors or outdoors.

DESCRIPTION OF SYMBOLS 1 Illuminating device 3 Lamp main body 5 Support member 7 Housing | casing 7L Base 7U Cover 9 Light guide 11 Light emitting element 13 Substrate 14 Mounting surface 19 Convex part 23 Opening part 31 Concave part 35 Outer end face 37 Inner end face 41 Outgoing face 43 Incoming face 44 Coating

Claims (9)

A light guide having a light incident surface and a light exit surface intersecting the light incident surface;
At least one substrate having a mounting surface and disposed along the light incident surface of the light guide;
A plurality of light emitting elements provided on the mounting surface of the substrate;
A housing on which the substrate is mounted,
The mounting surface of the substrate is along the light exit surface of the light guide;
The housing is
A cover,
Including a base on which convex portions are formed,
The substrate has a recess formed on the outer end surface of the substrate, or a hole,
The convex portion is fitted into the concave portion or the hole portion,
The substrate is sandwiched between the cover and the base ;
The inner end surface of the substrate is an illumination device in contact with the light incident surface of the light guide .   The lighting device according to claim 1, wherein each of the plurality of light emitting elements emits light along the mounting surface of the substrate.   The lighting device according to claim 1, wherein the light incident surface of the light guide is subjected to a light diffusion process.   The lighting device according to any one of claims 1 to 3, wherein a coating is formed on the light exit surface of the light guide.   The lighting device according to claim 1, wherein the number of the substrates is plural. The light exit surface of the light guide is circular,
The lighting device according to any one of claims 1 to 5, wherein the light guide has a disk shape.   Each of these light emitting elements is an illuminating device of any one of Claims 1-6 which radiate | emits light toward the center of the said light guide. The housing having an electrical insulating property, the illumination device according to any one of claims 1 to 7. The housing has an opening in which the light guide is disposed,
The light incident surface of the light guide includes a curved surface,
Inner end surface of the substrate comprises a curved surface along the light incident surface of the light guide, an illumination device according to any one of claims 1 to 8.

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