JP6187851B2 - Lighting device - Google Patents

Description

  The present invention relates to a so-called pendant type lighting device, and more particularly to a technique for improving design properties.

2. Description of the Related Art Conventionally, a so-called pendant type illuminating device used in a state of being suspended from a ceiling by a cord and using an LED (Light Emitting Diode) has been proposed (see Patent Document 1).
The lighting device described in Patent Document 1 includes a disk-shaped light guide member having an opening at a substantially central portion, a plurality of LEDs disposed inside the opening of the light guide member, and a light guide member. A light diffusing member that covers the surface and a light shielding cover that covers the opening of the light guide member are provided. In this illuminating device, light from an LED (a so-called point-like light emitting portion) is prevented from being directly emitted to the outside by the light shielding cover, and only the light that has passed through the light guide member and the light diffusing member is emitted to the outside. Thereby, the lighting device during lighting has an appearance that has a ring-shaped light emitting portion.

JP 2011-222524 A

  By the way, in recent years, with the diversification of user preferences, the appearance of lighting devices has also become various. Therefore, a lighting device provider is required to realize a lighting device having a novel appearance that attracts more customers. In general, the user tends to prefer a lighting device that is more innovative in the appearance of the light emitting unit during lighting. For example, if the light-emitting unit that is turned on appears to be floating in the air, the user does not feel that the lighting device is suspended from the ceiling by a cord. A so-called pendant type lighting device is generally suspended from a ceiling by a cord. Therefore, it is almost certainly desired to realize a lighting device that seems to have a light emitting part floating in the middle of lighting so as to give a novel impression to the user.

  This invention is made | formed in view of the said reason, and it aims at providing the illuminating device rich in the designability.

  An illuminating device according to one embodiment of the present invention includes a plate-like member, and a light-emitting portion that is disposed so that at least a part protrudes from the main surface of the plate-like member toward the region facing the main surface. At least the periphery of the light emitting portion of the surface is a mirror surface.

  According to this configuration, since at least the periphery of the light emitting portion of the main surface of the plate-shaped member is a mirror surface, during lighting, the main surface of the light emitting portion protrudes toward the region facing the main surface from the main surface of the plate-shaped member. A part (hereinafter referred to as “protruding part”) is reflected on the one surface of the plate-like member. Here, a user looking up the lighting device being lit from the main surface side sees a virtual image of the protruding portion reflected on the main surface of the plate-like member together with the actual protruding portion. And since the virtual image constitutes a part of the light-emitting part and the whole light-emitting part appears to be floating in the air to the user, the appearance of the light-emitting part during lighting gives a novel impression to the user. be able to. That is, it is possible to realize an illumination device that is rich in design.

The perspective view of the illuminating device which concerns on embodiment. The disassembled perspective view of the illuminating device which concerns on embodiment. The side view which fractured | ruptured the lighting apparatus which concerns on embodiment partially. The cross-sectional perspective view of the housing | casing which concerns on embodiment. The perspective view of the light emitting module which concerns on embodiment. The perspective view of the reflective member which concerns on embodiment. The perspective view of the light guide member which concerns on embodiment. The perspective view of the light-diffusion member which concerns on embodiment. The perspective view of the plate-shaped member which concerns on embodiment. (A) is a figure which shows the one part optical path of the light radiated | emitted from the site | part which protruded below from the lower surface of the plate-shaped member among the light-diffusion members of a light source unit during lighting about the illuminating device which concerns on embodiment. b) is a perspective view showing an appearance when viewed from obliquely below during lighting. 4A and 4B are diagrams for explaining optical characteristics of the lighting device according to the embodiment. The side view of the illuminating device which concerns on a modification. The side view of the illuminating device which concerns on a modification.

<Embodiment>
<1> Configuration FIG. 1 shows a perspective view of lighting device 1 according to the present embodiment, FIG. 2 shows an exploded perspective view, and FIG. 3 shows a partially broken side view.
The lighting device 1 is a so-called pendant type lighting device that is used by being suspended from a ceiling. Hereinafter, in this specification, the main light emission direction of the illuminating device 1 will be described as a downward direction, and the direction opposite to the main light emission direction will be described as an upward direction.

The lighting device 1 mainly includes a light source unit 10, a cord 20, a fixture 30, a cover 40, and a plate-like member 50.
<1-1> Light Source Unit The light source unit 10 includes a housing 11, a light emitting module 12, a reflecting member 13, a light guide member 14, and a light diffusing member 16. Here, the light emitting unit is composed of the light emitting module 12, the reflecting member 13, the light guiding member 14, and the light diffusing member 16.

<Case>
The housing 11 houses the light emitting module 12, the reflecting member 13, and the light guide member 14.
The casing 11 has a bottomed cylindrical first case portion 11a, a bottomed cylindrical shape, and has a circular opening in a plan view at a substantially central portion of the bottom wall 11ba and has an outer diameter of the first case portion 11a. The second case portion 11b is larger than the second case portion 11b and has a substantially bottomed cylindrical shape as a whole. In other words, the first case portion 11a and the second case portion 11b have a circular cross-sectional shape orthogonal to the cylinder axis direction. A step portion 11h is formed from the side wall 11ab of the first case portion 11a and the bottom wall 11ba of the second case portion 11b. The step portion 11h is recessed on the opening side in the cylinder axis direction at a corner opposite to the opening side of the casing 11 in the cylinder axis direction.

The first case portion 11a and the second case portion 11b are not limited to those having a circular cross-sectional shape orthogonal to the cylinder axis direction, and the cross-sectional shape orthogonal to the cylinder axis direction is square. It may be a bottom cylinder.
FIG. 4 is a cross-sectional perspective view of the housing 11 according to the embodiment.
The bottom wall 11aa of the first case portion 11a is provided with two bosses 11f projecting on both sides in the thickness direction of the bottom wall 11aa. Each boss 11f is provided with a screw hole 11c. A through hole 11g is provided through substantially the center of the bottom wall 11aa. A so-called plug type packing 111 is fitted in the through hole 11g. The packing 111 is provided with two insertion holes 111a through which two lead wires 22 described later exposed at one end of the cord 20 are inserted.

  2 and 4, the bottom wall 11aa is provided with three bosses 11d, and each boss 11d is formed with an insertion hole 11da into which a screw 19a described later is inserted. . Here, the boss 11f and the three bosses 11d are connected to each other via a reinforcing rib 11e. Each screw 19a is inserted into the insertion hole 11da of the boss 11d while being inserted into the washer 19b, and is screwed into a screw hole 13d provided in each of three ribs 13e described later of the reflecting member 13.

The housing 11 is made of, for example, a metal material or a resin material.
<Light emitting module>
5A and 5B show the light emitting module 12 according to the embodiment, where FIG. 5A is a perspective view seen from the upper side, and FIG. 5B is a perspective view seen from the lower side.
The light emitting module 12 emits white light upon receiving power supply from the outside.

The light emitting module 12 includes a substrate 12a and a plurality (18 in FIG. 5B) of light emitting elements 12b mounted on the substrate 12a.
The substrate 12a is formed in a substantially disc shape. A through hole 12c having a circular shape in a plan view is provided in a substantially central portion of the substrate 12a. Further, around the through-hole 12c in the substrate 12a, there are three through-holes 12d arranged at approximately equal intervals along the circumferential direction of the through-hole 12c, and two through-holes 12e located at two positions sandwiching the through-hole 12c. Is provided. A power receiving terminal 12f for supplying power from an external power source to the light emitting element 12b is disposed on the lower surface of the substrate 12a.

  The light emitting element 12b is made of SMD (Surface Mount Device) type LED. The light emitting element 12b is not limited to the SMD type LED, and may be a COB (Chip On Board) type LED. Moreover, you may use an organic EL element instead of LED. Further, as the light emitting module 12, for example, a module having a plurality of types of light emitting elements 12b having different color temperatures of emitted light may be adopted. In this case, the color temperature of white light emitted from the light emitting module 12 can be changed by appropriately adjusting the amount of light emitted from each light emitting element 12b.

  As shown in FIGS. 2 and 3, in the light emitting module 12, the surface of the substrate 12 a opposite to the surface on which the light emitting element 12 b is mounted faces the bottom wall 11 aa of the first case portion 11 a of the housing 11. It arrange | positions in the housing | casing 11 in the state which contacted. Here, the packing 111 is inserted into the through hole 12c, and a part of the boss 11f of the housing 11 is inserted into the through hole 12e.

<Reflection member>
6A and 6B show the reflecting member 13, in which FIG. 6A is a perspective view seen from the upper surface side, and FIG. 6B is a perspective view seen from the lower surface side.
The reflection member 13 reflects a part of the light emitted from the light emitting module 12 downward.
The reflecting member 13 has a substantially disk shape. A substantially annular groove 13 a extending in the circumferential direction of the reflecting member 14 is formed on the peripheral portion of the lower surface of the reflecting member 13. A plurality of through holes 13b are formed at substantially equal intervals along the circumferential direction at the bottom of the groove 13a. The number of through holes 13 b is equal to the number of light emitting elements 12 b of the light emitting module 12.

The groove part 13a has a cross-sectional shape in which the groove width gradually increases as the distance from the bottom part increases. The side surface 13c of the groove 13a constitutes a reflection surface that reflects the light emitted from the light emitting element 12b to the upper surface side of the reflection member 13.
Further, three ribs 13 d are projected from the lower surface of the reflecting member 13. And the screw hole 13e is drilled in the front end surface of each rib 13d. In addition, a substantially cylindrical portion 13 f that is partly cut out is provided at the approximate center of the upper surface of the reflecting member 13. The tubular portion 13f is for regulating the position of a lead wire 22 (described later) inserted through the insertion hole 111a of the packing 111.

The reflecting member 13 is formed from a metal material, a resin material, or the like. Examples of the resin material include a highly light reflective polybutylene terephthalate (PBT) resin, a highly reflective polycarbonate (PC) resin, and the like.
As shown in FIGS. 2 and 3, the reflecting member 13 is disposed below the light emitting module 12 with its upper surface in contact with the surface of the substrate 12 a of the light emitting module 12 on which the light emitting element 12 b is mounted. The Here, each light emitting element 12b of the light emitting module 12 is arranged inside each through hole 13b. Each of the three ribs 13b is inserted into each of the three through holes 12d.

<Light guide member>
As shown in FIG. 2, the light guide member 51 has a substantially disk shape. The light guide member 51 has a light incident part, and guides light incident from the light incident part to a part other than the light incident part in the light guide member 51.
FIG. 7 shows a cross-sectional perspective view of the light guide member 14.

  On the upper surface of the light guide member 14, a substantially annular raised portion 14 a that is raised upward is formed. The top portion 14aa of the raised portion 14a has a shape that undulates in a substantially sawtooth shape along the circumferential direction of the raised portion 14a. The top portion 14aa corresponds to a light incident portion of the light guide member 14. A plurality of recesses 14 c are formed on the upper surface of the light guide member 14 other than the raised portions 14 a. The recess 14 c is for scattering light propagating through the light guide member 14 to the lower surface side of the light guide member 14. And the light distribution characteristic of the illuminating device 1 can be set to a desired characteristic by setting the distribution of the depth and the size of the concave part 14c in the radial direction of the light guide member 14 as appropriate. In addition, a substantially annular projection 14b that protrudes downward is formed on the periphery of the lower surface of the light guide member 14.

The light guide member 14 is formed of a light-transmitting resin material, glass, ceramics, or the like. Examples of the resin material include acrylic resin, polycarbonate resin, and polystyrene resin.
As shown in FIGS. 2 and 3, the light guide member 14 is disposed on the lower surface side of the reflection member 13 with the upper surface thereof in contact with the lower surface of the reflection member 13. Here, the raised portion 14 a is disposed in the groove portion 13 a of the reflecting member 13, and the top portion 14 aa of the raised portion 14 a faces the through hole 13 b of the reflecting member 13.

<Light diffusion member>
The light diffusing member 16 diffuses the light incident from the light guide member 14 and radiates it from the entire outer surface of the light diffusing member 16.
FIG. 8 is a perspective view of the light diffusing member 16.
The light diffusing member 16 has a bowl shape that is substantially circular in plan view, and gradually increases in thickness as it approaches the peripheral edge portion 16c. Two grooves 16 a and 16 b are provided at the end of the light diffusing member 16 along the peripheral edge 16 c of the light diffusing member 16.

  As a material for forming the light diffusion member 16, for example, particles made of another light-transmitting material having a refractive index different from that of the one light-transmitting material are dispersed in a base material made of one light-transmitting material. What is necessary is just to use. Here, as a translucent material, the resin material of a silicone resin, an acrylic resin, and a polycarbonate resin is mentioned, for example. Further, for example, milky white glass (opal glass), milky glass, or the like may be used as a material that scatters light.

As shown in FIGS. 2 and 3, an annular packing 18 is fitted in the groove 16 b outside the light diffusing member 16. Thereby, the space enclosed by the housing | casing 11 and the light-diffusion member 16 is maintained airtight, and deterioration of each component accommodated in the housing | casing 11 can be suppressed.
Further, with the light diffusing member 16 attached to the lower surface side of the light guide member 14, the protrusion 14 b of the light guide member 14 is fitted into the groove 16 a inside the light diffusing member 16. Here, the light guided to the protruding portion 14b of the light guide member 14 is likely to enter the outer peripheral surface 16aa of the groove portion 16a toward the peripheral edge portion 16c of the light diffusing member 16.

<1-2> Cord As shown in FIG. 2, the cord 20 is obtained by covering a part of two lead wires 22 with a covering member. Two lead wires 22 are exposed at one end of the cord 20, and an adapter (not shown) that can be attached to a connection device installed on the ceiling is attached to the other end. In the state where the portion covered with the covering member at one end of the cord 20 is sandwiched between the fixtures 30 fixed to the housing 11 and the adapter attached to the other end is attached to the connecting device, the light source The unit 10, the plate-like member 50, the fixture 30 and the cover 40 are supported by the cord 20. The light source unit 10 is supplied with electric power from an external power source through two lead wires 22. In addition, as a connection tool, a hook ceiling, a hook rosette, etc. are mentioned, for example. Examples of the adapter include a sealing cap and an outlet adapter.

<1-3> Fixing Tool As shown in FIGS. 2 and 3, the fixing tool 30 has a function of holding one end of the cord 20. The fixture 30 includes a main body 31 having a bowl shape as a whole and a flange 33 projecting outward from the peripheral edge of the main body 31. In addition, an insertion hole 35 for allowing the cord 20 to pass therethrough is provided at the bottom of the main body 31. The flange portion 33 is provided with a plurality of (two in FIG. 2) insertion holes 37 through which screws 60 for attaching the fixture 30 to the light source unit 10 are inserted. The fixing tool 30 is fixed to the housing 11 by screwing the screw 60 inserted through the insertion hole 37 into the screw hole 11 c of the boss 11 f of the housing 11.

The fixture 30 is made of, for example, a metal material.
<1-4> Cover The cover 40 is disposed so as to cover the fixture 30. The cover 40 includes a bottomed cylindrical main body portion 41 and a conical portion 43 that protrudes from a substantially central portion of the bottom wall of the main body portion 41. And the fixing tool 30 is arrange | positioned inside the cone-shaped part 43. FIG. An insertion hole 45 for inserting the cord 20 is provided at the tip of the conical portion 43.

The cover 40 is made of, for example, a resin material.
<1-5> Plate-like Member The plate-like member 50 reflects a part of the light emitted from the light scattering member 16 downward on the lower surface 58a and the other part of the light emitted from the light scattering member 16. Is guided to the outer end face 53 and emitted from the outer end face 53.

FIG. 9 is a perspective view of the plate member 50.
The plate-like member 50 has a disk-like shape having an opening 52 at a substantially central portion and having a lower surface 58a and an upper surface 58b as mirror surfaces. Here, the opening 52 is a first opening 52a having a circular shape in plan view located on the lower surface 58a side in the thickness direction of the plate-like member 50, and is located on the upper surface 58a side in the thickness direction and from the first opening 52a. The second opening 52b has a small opening diameter. The first opening 52a and the second opening 52b have the same center in the thickness direction of the plate-like member 50. A surface 56 perpendicular to the thickness direction of the plate-like member 50 is formed between the first opening 52a and the second opening 52b.

The “mirror surface” means that the arithmetic average Ra of the surface roughness based on the JIS standard is 10 nm or less.
As shown in FIGS. 2 and 3, the first opening 52 a of the plate-like member 50 is set to be slightly smaller than the outer diameter of the second case portion 11 b of the housing 11. The second opening 52b of the plate member 50 is set to be slightly larger than the outer diameter of the first case portion 11a of the housing 11 and smaller than the outer diameter of the second case portion 11a of the housing 11. Has been. The plate-like member 50 has the second case portion 11b inside the first opening 52a, the first case portion 11a inside the second opening 52b, and the surface 56 being the bottom wall of the second case portion 11b. It is hooked on the step portion 11h of the housing 11 in a state of surface contact with the upper surface of 11ba. Thus, by the plate-like member 50 being hooked on the step portion 11h, for example, compared to the configuration in which the plate-like member 50 is hooked on the peripheral portion of the bottom wall 11aa of the first case portion 11a, The thickness of the entire lighting device can be reduced. A part of the light scattering member 16 of the light source unit 10 protrudes downward from the lower surface 58 a of the plate-like member 50.

  Further, the distance T 1 between the surface 56 and the lower surface 58 a in the plate-like member 50 is longer than the distance T 2 between the step portion 11 h and the upper end of the light scattering member 16 in the housing 11. Then, in a state where the plate member 50 is hooked on the step portion 11 h of the housing 11, the light diffusion member 16 is disposed in a region surrounded by the surface 56, the inner end surface 54, and the housing 11 of the plate member 50. A peripheral edge 16c is arranged. Here, the peripheral edge portion 16c of the light scattering member 16 faces the inner end face 54 and the face 56 of the first opening 52a.

Thereby, the light that has propagated to the peripheral edge portion 16 c of the light scattering member 16 enters the inside of the plate-like member 50 from the inner end surface 54 or the surface 56 of the plate-like member 50. The light incident on the inside of the plate-like member 50 propagates to the outer end surface 53 while repeating total reflection on the lower surface 58 a and the upper surface 58 b of the plate-like member 50, and is emitted to the outside from the outer end surface 53.
Here, as described above, the light scattering member 16 partially disposed inside the opening 52 of the plate-like member 50 has a circular shape in plan view. The plate-like member 50 is also circular in plan view, and the opening 52 is circular in plan view and provided at the center. Thereby, the distance from the inner side end surface 54 to the outer side end surface 53 in the radial direction of the plate-shaped member 50 is equal over the whole circumferential direction. That is, the propagation distance of light from the peripheral edge portion 16c of the light scattering member 16 to the outer end surface 53 of the plate-like member 50 is equal over the entire circumferential direction. For this reason, since the light quantity of the light radiated | emitted outside from the outer side end surface 53 can be made uniform over the outer side end surface 53 whole, the external appearance improvement of the illuminating device 1 during lighting can be aimed at.

The plate-like member 50 is formed from a light-transmitting resin material, glass, ceramics, or the like. Examples of the resin material include acrylic resin, polycarbonate resin, and polystyrene resin. Thus, even if the plate-like member 50 is formed of a material having translucency, the mirror surface portion reflects light.
Note that the plate-like member 50 is not necessarily limited to one made of a material having translucency, and a reflective film made of a metal material is provided on at least one of the lower surface 58a and the upper surface 58b of the plate-like member 50. It may be what was made. Here, by appropriately setting the thickness of the reflective film, a so-called half mirror shape in which the upper surface 58b side can be seen through when the plate-like member 50 is viewed from the lower surface 58a side may be used. Further, by increasing the thickness of the reflective film, the light that enters the lower surface 58a of the plate-like member 50 from the light scattering member 16 may be formed in a so-called mirror shape.

<2> Optical Characteristics of Illuminating Device FIG. 10A shows an optical path of a part of light emitted from a portion of the light diffusing member 16 of the light source unit 10 that protrudes downward from the lower surface 58a of the plate-like member 50. FIG. 10B shows an external appearance of the lighting device 1 that is turned on when viewed obliquely from below.
As shown in FIG. 10A, during lighting of the lighting device 1, the light diffusing member 16 is radiated from a portion projecting downward from the lower surface 58 a of the plate-like member 50 (hereinafter referred to as “projecting portion”). Part of the light incident on the lower surface 58 a of the plate-like member 50. And in the state which the user P is looking up at the illuminating device 1 currently turned on from the lower surface 58a side (diagonally lower side in Fig.10 (a)), the light which injected into the lower surface 58a of the plate-shaped member 50 from the said protrusion part concerned The light beam is reflected by the lower surface 58a and reaches the user P (see the dashed line arrow in FIG. 10A).

  Here, as shown in FIG. 10B, the user P sees the virtual image V of the protruding portion reflected on the lower surface 58 a of the plate-like member 50 together with the actual protruding portion. Therefore, the user P has an illusion that the virtual image V reflected on the lower surface 58 a of the plate-like member 50 constitutes the light scattering member 16 at all. As a result, the lighting device 1 that is turned on has an appearance that has a light emitting unit that floats in the air, and a novel impression can be given to the user P.

FIG. 11A shows a diagram for explaining optical characteristics of the illumination device 1 according to the embodiment.
As shown in FIG. 11A, the virtual image V is an image protruding upward from the lower surface 58a by the same amount as the protruding amount L2 of the protruding portion of the light diffusing member 16. Therefore, it seems to the user P that the lighting device 1 has a light emitting portion having a thickness L1 corresponding to twice the protruding amount L2 of the light diffusing member 16. Here, it is assumed that the protrusion amount L2 is set so that the thickness L1 corresponding to twice the protrusion amount L2 of the light diffusing member 16 is thinner than the actual thickness L0 of the light source unit 10. Then, the user P has an illusion that the thickness of the lighting device 1 is thinner than the actual thickness L0.

By the way, when the user P looks up the lighting device 1 from obliquely below and the member positioned above the upper surface 58b of the plate-like member 50 enters the field of view of the user P, the user P determines the actual thickness of the lighting device 1. It can be recognized.
Therefore, in the lighting device 1 according to the present embodiment, the size and arrangement of the plate member 50 are set so that the member located above the upper surface 58b of the plate member 50 is out of the field of view of the user P. As a result, the user P has an illusion that the lighting device 1 is composed only of the light scattering member 16 and the plate-like member 50, and thus feels that the thickness of the lighting device 1 is thinner than the actual thickness.

  As shown in FIG. 11B, a member where the user P (particularly, the head of the user P) can exist in the illumination space is located above the upper surface 58 b of the plate member 50 by the plate member 50. The size and arrangement of the plate member 50 are set so as to be included in the invisible region AR. In this area AR, a straight line Li1 (see a two-dot chain line in FIG. 11B) connecting the upper end of the cover 40 and the periphery of the upper surface 58b of the plate-like member 50 is a central axis J1 of the illumination device 1 (FIG. 11B). ) Refers to the alternate long and short dash line)) It is located below the conical curved surface obtained by rotating around.

  For example, in the direction of the central axis J1 of the illuminating device 1, the distance Po1 of the intersection Po1 between the central axis J1 and the straight line Li1 from the upper surface 58b of the plate-like member 50 is L3, and the radius of the outer peripheral edge in plan view of the plate-like member 50 Is R. Further, the distance from the virtual plane S including the position of the standing user P's eyes and orthogonal to the central axis J1 to the upper surface 58b of the plate-like member 50 is L4. In this case, the area AR in the virtual plane S is a circular area having a radius r represented by the following formula (1).

Therefore, for example, if the size of the room in which the lighting device 1 is suspended is 5 m × 5 m, it is sufficient to set r to 3.75 m. If the plate-like member 50 is arranged so that the distance L3 is 4 cm and the lighting device 1 is arranged so that the distance L4 is 80 cm, R may be set to about 19 cm. .
In the lighting device 1, as described above, the light that has entered the plate-like member 50 from the light scattering member 16 propagates to the outer end surface 53 of the plate-like member 50 and then is radiated to the outside. Thereby, during lighting of the illuminating device 1, the outer side end surface 53 of the plate-shaped member 50 emits light in a ring shape. For the user P looking up at the lighting device 1 from the lower surface 58a side, a ring-shaped light emitting unit is arranged around the light emitting unit including the light scattering member 16 and the virtual image V. It looks more innovative than it is.

In this way, by improving the appearance of the light emitting unit of the lighting device 1 that is turned on with respect to the user P, it is possible to improve the presentation effect.
<3> Summary After all, in the lighting device 1 according to the embodiment, the entire lower surface 58a of the plate-like member 50 is a mirror surface. That is, the entire lower surface 58a including the region closest to the protruding portion on the lower surface 58a of the plate-like member 50 is a mirror surface region. Thereby, the said protrusion part is reflected on the said one surface of a plate-shaped member during lighting. Here, the user P who is looking up at the lighting device 1 being lit from the lower surface 58a side can see the virtual image V of the protruding portion reflected on the lower surface 58a of the plate-like member 50 together with the actual protruding portion. And since the virtual image V constitutes a part of the light emitting part (light scattering member 16) to the user P and the whole light emitting part appears to float in the air, the user P is lit to the user. The appearance of the light emitting part in can give a novel impression. That is, it is possible to realize an illumination device that is rich in design.

Further, as described above, the user P has the illusion that the thickness of the lighting device 1 is about twice the thickness L1 of the protruding portion. Therefore, by making the protruding amount L2 of the protruding portion smaller than ½ of the actual lighting device thickness, the user P may be given an impression that the thickness of the light source unit 10 is thinner than the actual thickness L0. it can.
<Modification>
(1) In the embodiment, the example in which the thickness of the portion other than the thin portion 51 in the plate-like member 50 is substantially uniform has been described. However, the shape of the plate-like member 50 is not limited to this, for example, The thickness may be distributed in the radial direction of the plate member.

FIG. 12A shows a side view of the illumination device 201 according to this modification. In addition, about the structure similar to embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.
The thickness of the plate member 250 is the thickness W1 at the innermost side in the radial direction, and gradually decreases toward the outer side, and the thickness at the outermost side in the radial direction is a thickness W2 that is thinner than the thickness W1. In other words, the thickness of the plate-like member 250 gradually decreases as the thickness increases away from the opening 252 in the radial direction.

  According to this configuration, during lighting, it can be shown to the user that a ring-shaped light emitting portion having a thickness corresponding to the thickness W2 is arranged at a position corresponding to the outer end surface 253 of the plate-like member 250. it can. And the variation of how the light emission part (light-scattering member 16) looks during lighting can be increased only by designing thickness W2 suitably in the design stage of the illuminating device 201. FIG. Therefore, it is easy to realize an illumination device that provides a production effect according to various user needs.

FIG. 12B shows a side view of another illumination device 301 according to this modification. In addition, about the structure similar to embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.
The thickness of the plate member 350 is the thickness W1 on the innermost side (opening 352 side) in the radial direction, and gradually decreases as the distance from the opening 352 increases, and the outermost thickness in the radial direction becomes substantially zero. .

According to this configuration, during lighting, it is possible to make it appear to the user that a substantially ring-shaped light emitting portion is disposed at a position corresponding to the peripheral portion of the plate-like member 350.
(2) In the illuminating device according to the present invention, for example, a light diffusion process may be performed on the outer end face of the plate-like member.
In FIG. 13, the side view of the illuminating device 401 which concerns on this modification is shown. In addition, about the structure similar to embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

A plurality of recesses 453 a are formed on the outer end surface 453 of the plate-like member 450. Thereby, the light guided to the outer end surface 453 of the plate-like member 450 is easily diffused.
According to this configuration, during lighting, the light emitted from the outer end surface 453 of the plate-like member 450 can be distributed over a wider range, so that the feeling of brightness in the illumination space can be improved.
(3) In the embodiment, the example in which the plate-like member 50 is circular in plan view, that is, the outer peripheral shape in plan view is circular has been described, but is not limited to this. For example, the outer periphery in plan view The shape may be square.

  (4) In the embodiment, the example in which the entire lower surface 58a of the plate-like member 50 is a mirror surface has been described. However, the present invention is not limited to this. For example, only the region between the periphery of the opening 52 on the lower surface 58a of the plate-like member 50 and the part spaced apart from the periphery of the opening 52 by a predetermined distance in the radial direction of the plate-like member 50 is a mirror surface. The region may not be a mirror surface (for example, a matte process is performed). Further, in the embodiment, the example in which the upper surface 58b of the plate-like member 50 is a mirror surface has been described, but the upper surface 58b is not necessarily a mirror surface.

(5) In the embodiment, an example in which only one plate-like member 50 is provided has been described. However, the present invention is not limited to this. For example, a plurality of plate-like members are arranged around the light scattering member 16. It may be a configuration. Further, the plurality of plate-like members are not necessarily in contact with each other, and adjacent plate-like members may be arranged in a state of being separated from each other.
(6) In the embodiment, the example in which the plate-like member 50 has the opening 52 and the light source unit 10 is disposed inside the opening 52 has been described. However, the present invention is not limited to this. The whole light source unit 10 may be arrange | positioned at the lower surface side of a plate-shaped member. In this case, for example, as a plate-like member, a plate-like member having a circular shape in plan view and provided with a through-hole having a diameter slightly larger than the outer diameter of the cord 20 (diameter enough to allow the cord 20 to be inserted) in the central portion. Use it.

  In this configuration, the cord 40 is connected to the light source unit 10 in a state where the cover 40, the plate-like member, and the fixture 30 are inserted in this order. Then, a part of the lower surface of the plate-like member is placed on the fixture 30 that is fixed to the housing 11 of the light source unit 10. Note that the shape and structure of the fixture 30 are not particularly limited. For example, a recess is formed in the bottom wall 11ba of the second case portion 11b of the housing 11, and the entire fixture 30 is formed of the recess. The cover 40 is placed on the upper surface of the plate-like member.

(7) In the embodiment, the example in which the opening 52 of the plate-like member 50 is composed of two openings 52a and 52b that are arranged adjacent to each other in the thickness direction of the plate-like member 50 and have different diameters has been described. The shape of the opening 52 is not limited to this. For example, the opening of the plate-like member 50 may have the same diameter in the thickness direction of the plate-like member 50.
According to this structure, there exists an advantage that a plate-shaped member is easy to manufacture compared with the plate-shaped member 50 which concerns on embodiment.

  (8) In the embodiment, the example in which the plate-like member 50 is formed from a light-transmitting material has been described. However, the material of the plate-like member 50 is not limited to the light-transmitting material, and for example, a metal material Etc. may be formed.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Light source unit 11 Housing | casing 11h Step part 12 Light emission module 13 Reflective member 14 Light guide member 16 Light-diffusion member (a part of light emission part)
50 Plate-like member 58a Bottom surface

Claims (7)

A plate-like member formed using a translucent member and having an opening in the center;
It consists of a substrate on which the LED is mounted and a cover made of a light diffusing material, and at least a part protrudes from the principal surface of the plate-like member toward the region facing the principal surface, and a part of the opening. And a light emitting portion arranged to be inside the
The illumination device, wherein at least the periphery of the light emitting portion of the main surface is a mirror surface. A housing for storing the light emitting unit;
The casing has a bottomed cylindrical shape and is provided with a stepped portion that is recessed on the opening side in the cylinder axis direction at a corner opposite to the opening side in the cylinder axis direction.
The lighting device according to claim 1, wherein the plate-like member is attached to the housing in a state in which an inner peripheral portion of the opening is hooked to the stepped portion. The part disposed inside the opening in the light emitting part is circular in plan view,
The lighting device according to claim 1, wherein the plate-like member has an annular shape in a plan view, and the opening has a circular shape in a plan view. The lighting device according to claim 3, wherein at least a part of the other surface of the plate-like member opposite to the main surface is a mirror surface. The lighting device according to claim 3, wherein the plate-like member is subjected to a light diffusion process on an outer end surface. The maximum value of the protrusion amount of the portion of the light emitting portion that protrudes from the main surface of the plate-like member toward the region facing the main surface is 1/2 of the thickness of the structure including the casing and the light emitting portion. The illumination device according to claim 2 , wherein the illumination device is smaller than the illumination device. The lighting device according to any one of claims 1 to 6, wherein the thickness of the plate-like member gradually decreases with increasing distance from the opening in the radial direction.

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