JP2011203720A - Reflection plate, illumination unit, illumination device, and display device - Google Patents

Abstract

Provided is a reflector that can be arranged in a plurality while preventing the formation of a gap, and as a result, it is possible to easily manufacture a lighting device having no uneven illuminance.
An accommodating recess for accommodating a light source has a bottom surface portion 12 narrower than an opening edge 11e, and a peripheral side wall 13 extending outwardly from the outer edge toward the opening edge 11e. 12 is a reflecting plate 1 that reflects light emitted from a light source disposed on a peripheral side wall 13, and is formed in a rectangular shape in plan view with a flange portion 1 f extending outward at an outer peripheral portion. 1 fb of the low position formed in the position lower than the other part along the two sides from one corner to the opposite corner, and the collar along the two sides facing the two sides A flange portion 1fa at a position higher than 1fb is formed, and a notch portion CT is formed at two corners that are boundaries between the flange portion 1fb at a low position and the flange portion 1fa at a high position, and the shape is the same. So that the reflector and the buttocks overlap each other vertically and horizontally. .
[Selection] Figure 1

Description

  The present invention is provided with a housing recess for housing a light source, the housing recess having a bottom surface narrower than the opening edge thereof, and a peripheral side wall extending outward from the outer edge of the bottom surface portion toward the opening edge. And a reflector that is formed so that light emitted from a light source disposed on the bottom surface can be reflected by the peripheral side wall, and an illumination unit, an illumination device, and a display device that employ such a reflector .

In recent years, white light-emitting diodes (LEDs) have been developed, and light-emitting elements equipped with white LEDs are generally more energy efficient than fluorescent lamps and incandescent bulbs, and have a long life span. ing.
However, since this LED element does not irradiate a certain amount of light over a certain area just by irradiating strong light locally as it is, for example, to use it as illumination light It is required to impart light diffusibility.
Also, when used for general indoor lighting or backlights of display devices, it is usually difficult to obtain a light quantity comparable to that of a fluorescent or incandescent lamp with a single LED element. Therefore, it is required to make these in a uniform surface emitting state.

  In response to such a demand, an inverted polygonal frustum-shaped accommodation recess for accommodating LED elements is arranged vertically and horizontally on a flat plate member having excellent light reflectivity to form a reflection plate. The LED element is disposed in the housing recess, the light of the LED element is reflected on the inner wall surface having the inverted polygonal frustum shape, and the reflected light is irradiated toward the front surface of the reflector, and the front surface of the reflector is provided. It has been proposed to diffuse the reflected light with a light diffusion plate (Patent Document 1 below).

By the way, there are various types of lighting devices as well as shapes, and various shapes are also required for the reflector.
However, it is not preferable from the standpoint of production cost to prepare the required shape each time.
Regarding such a problem, a method of preparing small reference units and combining them in various shapes can be cited as an effective measure.
For example, when manufacturing a lighting device having a light emitting surface with a large area, a reflecting plate corresponding to the light emitting surface is required, but such a large reflecting plate is not only difficult to manufacture itself. It is difficult to handle an efficient lighting device even in an operation such as attaching an LED element.
Therefore, a large number of lighting units in which LED elements are incorporated in a reference-size reflecting plate are prepared, and these are arranged to form a large-area light emitting surface, which is covered with a single large light diffusing plate, and the lighting device is If it is the method of forming, an illuminating device can be manufactured more efficiently.

However, in such a case, if a gap is generated between the reflecting plates, the light reflected by the light diffusing plate leaks to the back side of the lighting unit, thereby reducing the efficiency.
Moreover, the dark part according to the clearance gap may arise on the surface of the light diffusing plate, which may cause uneven illuminance.
That is, conventionally, there is a problem that it is difficult to manufacture a lighting device with little unevenness in illuminance.

International Publication WO2007 / 037035

  An object of the present invention is to solve the above-described problems, and to provide a reflector that can be arranged in a plurality while preventing the formation of gaps, thereby facilitating the manufacture of a lighting device with no uneven illuminance. It is an issue.

  The present invention according to the reflecting plate for solving the above-described problem is provided with a housing recess for housing a light source, and the housing recess has a bottom surface narrower than an opening edge thereof and an opening from the outer edge of the bottom surface. A reflector having a peripheral side wall that extends outward toward the edge, and is formed so that light emitted from the light source disposed on the bottom surface part can be reflected by the peripheral side wall, and is outwardly directed to the outer peripheral part. A flange portion extending in a rectangular shape in plan view, a portion of the flange portion being formed at a position lower than the other portion, and another reflector having the same shape The lower-side eaves are formed along two sides from one corner of the rectangle to the opposite side so that the eaves can be arranged vertically and horizontally so that the eaves overlap each other. The heel portion at a higher position is formed along two sides opposite to the two sides. The at two corners at the boundary between the flange portion of the high position and flange portion of the lower position is characterized in that cutouts the flange portion is cut out is formed.

  According to the present invention, in the reflector plate that is provided with a flange portion that extends outward on the outer peripheral portion and is formed in a rectangular shape in plan view, some of the flange portions are formed at a lower position than the other flange portions. When the other reflectors having the same shape are arranged side by side, the lower flange portion is inserted under the flange portion formed at the higher position in the other reflector plate so that the flange portions are overlapped vertically. A plurality of reflectors can be arranged in parallel.

  In addition, since the lower collar is formed on two sides from one corner to the corner opposite the corner, the collar is overlapped not only in the horizontal direction but also in the vertical direction. A reflector can be arranged.

Further, the two corners that are the boundary between the low position collar and the high position collar are formed with notches formed by notching the collar, so that, for example, the reflector is vertically 2 In the case where a total of four sheets of two sheets are arranged side by side, it is possible to suppress interference between the reflecting plates at the central location where the boundary of the reflecting plates intersects the cross and hindering the overlapping of the collar portions.
That is, the reflecting plate of the present invention can be easily arranged in a plane while suppressing the formation of gaps as well as being easily arranged vertically and horizontally.

  Therefore, by producing an illumination unit using this reflector, it is possible to provide an illumination device that is easy to manufacture and that suppresses uneven illuminance and a display device that suppresses display unevenness.

The perspective view (a) which shows the reflecting plate of one Embodiment, and a fragmentary sectional view (b). The top view which shows the mode of the reflective surface of the accommodation recessed part of the embodiment. The top view which showed a mode that a reflecting plate was arranged. The top view which showed the mode of the accommodation recessed part of the conventional reflecting plate. The top view (a) which shows the reflecting plate of other embodiment, the partial sectional view (b), and the principal part expanded sectional view (c).

Embodiments of the present invention will be described below.
(First embodiment)
FIG. 1 is a perspective view (a) of the reflector according to the first embodiment and a sectional view (b) taken along the line XX ′ in the perspective view. FIG. 2 shows the reflector 1 of FIG. It is a top view which shows a mode seen from the top.
As shown in this figure, the reflector 1 of the present embodiment is a sheet body having a substantially uniform thickness as a whole, and is provided with a plurality of receiving recesses 10 having polygonal openings arranged vertically and horizontally. It has been.
In the present embodiment, the plurality of receiving recesses 10 have the same shape and have a square opening in plan view.

The plurality of receiving recesses 10 are arranged with their opening edges in close contact with each other, and there is almost no separation between the receiving recesses 10.
On the other hand, a flange portion 1 f that extends outward is provided around the outer peripheral portion of the storage recesses arranged with substantially the same width.
Therefore, the reflector 1 according to the present embodiment is formed such that the outline in plan view is a rectangle having a slightly larger area than the sum of the opening edges of all the housing recesses 10.
The receiving recess 10 is formed with a bottom surface portion 12 having a smaller area than the square of the opening edge 11e and a peripheral side wall 13 extending outward from the outer edge 12e of the bottom surface portion 12 to the opening edge 11e. The light emitted from the light source disposed on the bottom surface portion 12 is reflected by the peripheral side wall 13 so as to be irradiated on the front surface side.

The flange portion 1f is provided on substantially the entire circumference except for the two corners of the rectangular reflector, but is cut out into a rectangle at the two corners positioned so as to be diagonal to the rectangle. The cutout portion CT is formed and is provided in a state of being divided into two areas in the circumferential direction.
The cutout CT is cut out into a square having the same side length as the extension of the flange 1f.
That is, the notch CT has a notch extending over the entire width of the flange 1f.

  Accordingly, the flange portion 1f is in a state of being completely divided into two in the circumferential direction, and one (1fa) has a long side and a short side between one (CT1) and the other (CT2) of the cutout portion CT. The other (1fb) is provided along two sides facing the two sides from the other notch portion CT2 to the one notch portion CT1.

The one flange portion 1fa is formed at the same height as the opening edge 11e of the housing recess 10, while the other flange portion 1fb is provided at a lower position one level lower than this.
The difference in height between the flange portion 1fa having the same height as the opening edge 11e (hereinafter also referred to as "high position flange portion 1fa") and the flange portion 1fb (hereinafter also referred to as "low position flange portion 1fb"), which is lowered by one step, The value is larger than the thickness of these ridges.
Therefore, as shown in FIG. 3, when arranging the reflectors having the same shape, the low position flange 1fb can be put under the high position flange 1fa of the reflectors arranged next to each other.

Note that FIG. 3 is a diagram showing the state of the four reflectors 1a to 1d in a plan view, in which the low position flange 1fb is hatched so as to clearly show the overlapping state.
As can be seen from this figure, in the reflector 1 of the present embodiment, the low position flange 1fb is provided along the right side edge and the lower side edge when viewed from the front, and the left side edge and the upper side edge opposite to this are provided. A high position flange 1fa is provided along the edge.
Since the low position collar 1fb and the high position collar 1fa are provided on the short side and the long side, respectively, the collar on the long side like the reflectors 1c and 1d on the left side of FIG. In addition to arranging the reflectors in a single vertical row, a plurality of reflective plates can be arranged in a horizontal row by superimposing the flanges on the short side.

In addition, the reflector 1 according to the present embodiment is formed with a notch portion CT in which the flange portion 1f is notched at two corner portions that are boundaries between the low position flange portion 1fb and the high position flange portion 1fa. Therefore, a plurality of reflectors can be arranged not only in one vertical and horizontal row but also in the vertical and horizontal directions.
This will be described in more detail with reference to FIG. 3. In the lower right reflecting plate 1a provided with a dashed circle with a reference symbol A in the upper right corner, the upper right corner and the lower left corner are The two notches are provided with cutout portions CT.
Then, on the left side of the reflecting plate 1a, when the reflecting plate 1a is arranged on the right side of the lower reflecting plate 1d of the two reflecting plates 1c and 1d that are juxtaposed in a state where the flanges are overlapped, If the position flange 1fa is extended to the notch CT surrounded by the broken line A, this portion will collide with the right edge (high position flange) of the left reflector 1d. Become.

  On the other hand, when the low position flange 1fb is extended to the portion surrounded by the broken line A, the flange (low position flange) of the reflector 1b arranged on the reflector 1a from the upper side in the front view of FIG. ).

  In the present embodiment, a square notch having a side length corresponding to the width of the flange portion 1f is provided so that the two reflection plates 1 to be adjacent to each other can overlap the entire flange portion 1f. The cutout portion CT is provided, but if it is only necessary to overlap a part of the outer side of the collar portion, a square cutout with the width of the overlap as the length of the side can be provided as the cutout portion. .

In addition, when the width of the flange portion overlapping in the vertical direction and the horizontal direction is made different, it is possible to provide a rectangular cutout with the length of each side as a cutout portion that exhibits the above functions. it can.
Since the reflectors can be arranged in such a manner that the flanges are overlapped vertically and horizontally as described above, a light source such as an LED element is accommodated in each of the reflectors to form an illumination unit, and a plurality of the illumination units are arranged vertically and horizontally. When this is covered with a single large light diffusion plate to form a lighting device, it is possible to suppress a gap from being formed between the lighting units and being viewed as a dark portion on the front side of the light diffusion plate. .
Therefore, even when this illumination device is employed as the backlight of the display device, it is possible to suppress the occurrence of display unevenness due to the dark portion.

  In order to arrange a light source such as an LED element on such a reflector 1, a through-hole 12 h into which the light emitting portion of the LED element can be inserted is provided in the bottom surface portion 12 of the housing recess 10, and the wiring and the like are arranged on the reflector And a method in which only the light emitting portion is accommodated in the bottom surface portion 12 of the accommodating recess 10.

The bottom surface portion 12 on which the through-hole 12h is formed is preferably a square in which the shape of the outer edge 12e is a fraction of the size of the opening edge 11e of the housing recess 10, and the square and bottom surface of the opening edge 11e It is preferable to make the center of the outer edge 12e of the portion 12 coincide with the square.
And it is preferable that the bottom face part 12 is formed in the state which rotated the square of the outer edge 12e 45 degree | times with respect to the square of the said opening edge 11e.
That is, the bottom surface portion 12 has four corners of the outer edge 12e positioned between two adjacent corners of the square of the opening edge 11e, and straight lines passing through the corner from the center of each side of the square of the opening edge 11e. It is preferable to arrange so as to pass through the center.

By arranging the bottom surface portion 12 with respect to the opening edge 11e in this manner and forming a triangular region connecting the corner of the bottom surface portion and the corner of the opening edge as a flat reflection surface, the peripheral side wall is formed. A plurality of reflecting surfaces for reflecting light can be formed on the inner wall surface of 13.
For example, FIG. 2 showing the state of the accommodating recess 10 in a plan view shows the state of the reflecting surface (circumferential side wall) in FIG. 1 in more detail. A total of eight reflective surfaces are formed.
Among them, each of the four surfaces 13a to 13d constitutes one side of a square whose upper edge is an opening edge 11e, and in addition to these four reflecting surfaces, four reflecting surfaces 13w to 13z are formed on the bottom surface side. Has been.
In the present embodiment, the further reflecting surfaces 13w to 13z form one side of the square of the outer edge 12e of the bottom surface 12 at the lower edge.

Further, the reflection surfaces 13a to 13d (hereinafter also referred to as “upper edge reflection surfaces 13a to 13d”) on the opening edge 11e side have four corners of the bottom surface portion 12 arranged toward the centers of the respective sides. It is a triangle (inverted isosceles triangle) connecting both ends of each side.
That is, the upper edge side reflection surfaces 13a to 13d are gradually narrowed from the opening edge 11e side toward the bottom surface portion 12, and finally become one point of the corner of the bottom surface portion 12.
In other words, the upper edge side reflection surfaces 13a to 13d are in a state in which the reflection surfaces forming adjacent sides at the upper edge portion are connected to each other in the circumferential direction at the opening edge 11e. In the portion moved to the 12 side, they are separated from each other, and the distance between the side edges of the adjacent reflecting surfaces gradually spreads toward the bottom surface portion 12, and the inverted isosceles triangle serving as the lower end thereof is formed. When reaching the apex position, the length of one side of the square of the bottom surface portion 12 is separated.

And the four reflective surfaces 13w-13z (henceforth "lower edge side reflective surfaces 13w-13z") in which the lower edge constitutes one side of the bottom surface part 12 are the four sides of the bottom surface part 12, respectively. And a triangle with the four corners of the opening edge 11e as vertices.
That is, the lower edge side reflection surfaces 13w to 13z are formed between the side edges that are separated from each other as the upper edge side reflection surfaces 13a to 13d face the bottom surface side. It is a triangle surrounded by one side.
As can be seen from FIG. 2, in the reflecting plate according to the present embodiment, the lower edge side reflecting surfaces 13 w to 13 z rising in a sharp state from the bottom surface portion 12 are formed in the vicinity of the light source.

In this regard, the effect will be described by comparing FIG. 4 showing the reflector having the inverted quadrangular frustum-shaped peripheral side wall of Patent Document 1 (WO2007 / 037035) with FIG. 2 of the present embodiment. 4, the four valleys 12 v ′ are formed so as to reach the opening edge 11 e ′ radially from the through-hole 12 h ′ in which the light source is arranged, but the reflector 1 according to the present embodiment covers this valley. In such a state, the lower edge side reflecting surfaces 13w to 13z are arranged.
Since this valley 12v ′ in the conventional reflecting plate hardly reflects the light emitted from the light source, for example, when a light source provided inside is light-emitted with a light diffusing plate or the like disposed on the front surface of the reflecting plate. In this case, a cross dark portion corresponding to the valley 12v ′ is formed on the light diffusion plate.

On the other hand, in the reflecting plate 1 according to the present embodiment, since the lower edge side reflecting surfaces 13w to 13z are formed in this portion, such a dark portion is hardly generated.
In the reflecting plate 1 according to the present embodiment, the valley 12v is formed on both sides of the lower edge reflecting surfaces 13w to 13z. The valley 12v is a direction in which the light source emits light (virtual lines D1 to D4). Is not provided, and the valley is not formed along the light emission direction as in the conventional reflector.
Therefore, it is difficult to form a dark part as compared with the conventional valley 12v ′.
Further, by providing the lower-limit reflection surfaces 13w to 13z, the valleys 12v on both sides thereof are formed so that the depth (angle formed by the reflection surfaces) is shallower (wider angle) than the conventional valley 12v ′. It will be.
That is, in this respect as well, it is difficult to form a dark part, and the light scattering property is improved by providing the lower limit side reflecting surfaces 13w to 13z.
Therefore, the illuminance unevenness of the lighting device can be further suppressed by making the housing recess of the reflecting plate have such a configuration.

In the present embodiment, the reflector 1 having a plurality of receiving recesses (two in the vertical direction and four in the horizontal direction in FIG. 1) so that a large-area lighting device can be easily manufactured to some extent is provided. Although illustrated, even if it is a reflector having only a single receiving recess, if a height difference is provided in the collar, and a notch is provided in the corner between them, the collar as described above is overlapped. In addition, the effect of preventing the formation of dark parts is exhibited.
The same applies to a reflector having a plurality of receiving recesses other than the eight illustrated in FIG.

Further, the shape of the housing recess does not have to be square as illustrated above, and can be various shapes.
For example, the shape of the opening edge of the housing recess may be a regular triangle, a regular pentagon, a regular polygon greater than a regular heptagon, or a circle.
In the case of providing an opening edge of a regular polygon, when the number of corners is “n”, a bottom surface of a regular n-gon having the same center as the regular n-gon of the opening edge is formed. When the regular n-gon of the opening edge and the regular n-gon of the bottom surface are rotated relative to each other at an angle of “180 degrees / n”, the shape illustrated in FIG. All of the surfaces can be triangular (reverse isosceles triangles), and all of the lower edge side reflection surfaces can be triangular (isosceles triangles).
When the opening edge and the bottom surface have the same shape, the design is easy and the manufacture is relatively easy.

In addition, the size of the opening edge and the depth of the housing recess are not particularly limited, and the reflector according to the present invention can be appropriately selected according to the application and the light source to be housed.
For example, when used as a reflector of a general LED element, the size of one side of the opening edge may be about 1 to 10 cm.
Further, the depth of the housing recess can be about 1 to 50 mm.
The material for forming such a reflector is not particularly limited, and a general flat sheet member such as a metal sheet, a resin sheet, or a laminated sheet thereof can be used.

A reflection plate formed by recessing one surface of the flat sheet member toward the other surface is a protrusion corresponding to an accommodation recess of the reflection plate on the back surface of the reflection plate. However, even if another reflector is stacked on one reflector, these protrusions can be stacked together with the projections accommodated in the receiving recesses of other reflectors. The thickness of what is overlapped only by the thickness of the flat sheet member is increased.
For example, when ten reflecting plates are stacked, these laminates can be formed with a thickness that is the sum of the thickness of one reflecting plate plus the thickness of nine flat sheet members.

Moreover, lightness can be provided to a reflecting plate by employ | adopting resin sheets, such as a resin foam sheet, as a raw material.
For example, a reflector made by molding a non-foamed sheet or foamed sheet made of a thermoplastic resin by a sheet molding method such as vacuum molding, pressure molding, vacuum pressure molding, press molding, etc. In addition, it is preferable in that it is excellent in lightness and can be accommodated without bulking a plurality of sheets.
In addition, by adopting such a sheet forming method, it is possible to easily produce a complicated shape of the accommodating recess, and it is also possible to easily form a flange portion or a notch portion having a height difference.
However, if necessary, other manufacturing methods such as injection molding can be employed.

(Second embodiment)
In the present embodiment, a reflecting plate in which a plurality of receiving recesses are arranged vertically and horizontally with the opening edges closely contacting each other is described as an example. However, the receiving recesses may be arranged with a certain interval.
A reflection plate of an embodiment different from the above-described exemplary reflection plate will be described below.

FIG. 5A is a plan view showing the arrangement of the reflectors 1x according to the second embodiment, FIG. 5B is a cross-sectional view taken along line YY ′ in this plan view, and FIG. It is the principal part expanded sectional view (c) which expanded the part shown with the broken line B in b).
As shown in this figure, the reflector 1 ′ of the second embodiment is arranged such that the shape of the internal space of the housing recess 10x is hemispherical, and the housing recess 10x is arranged at regular intervals in the vertical and horizontal directions. Except for the above, it is the same as the reflecting plate 1 of the first embodiment, and is a sheet body having a horizontally long rectangular shape and a substantially uniform thickness in a plan view, and all having the same shape. It is the same as the reflector 1 of the first embodiment in that a plurality of 10x are arranged in the vertical and horizontal directions, and the flange portion 1fx extending outward is provided with substantially the same width.

  Further, the flange portion 1fx is cut out at two corner portions that are diagonal in the rectangular reflector 1x to form a notch portion CTx. The notch portion CTx has a full width of the flange portion 1fx. And the other side (the lower position flange 1fbx) than the one side (the higher position flange 1fax) of the flanges 1fx divided into two in the circumferential direction by the notch CTx. The point arranged in the low position is the same as the reflector 1 of the first embodiment.

  That is, the cutout portion CTx allows the low-position flange portion 1fbx to be inserted under the high-position flange portion 1fax of the reflector plate arranged next to the reflector plate 1x in which the reflector plates 1x are arranged vertically and horizontally without any gap. The points are the same as those of the reflector 1 of the first embodiment.

On the other hand, as described above, the reflector 1x according to the second embodiment is different from the reflector 1 according to the first embodiment in that the housing recesses 10x are arranged at a predetermined interval. A point.
That is, the reflecting plate 1x in the second embodiment is formed between the opening edges of the accommodation recesses 10 adjacent to the flat portion 14 that is a reflecting surface facing the light diffusing plate disposed in front of the reflecting plate 1x in the light reflecting direction. Is formed.
In the first embodiment, the high position collar 1fa is formed so as to be at the same position as the opening edge of the housing recess in the height direction, but also in this second embodiment, the high position collar 1fa is It is provided so as to be flush with the flat portion 14, and the position in the height direction is made to coincide with the opening edge of the housing recess 10x.
On the other hand, the low position flange 1fbx is formed in a state of being stepped down with respect to the flat portion 14, and there is an accommodation recess between the opening edge of the accommodation recess 10x adjacent to the low position flange 1fbx. Flat portions 14 a ′ and 14 b ′ are formed with a narrower width than the flat portion 14 between 10 ×.
That is, in the reflector 1x of the second embodiment, when the flanges are overlapped, the flat portions 14a ′ and 14b ′ and the high position flange 1fax between the low position flange 1fbx and the housing recess are Is formed to be flush with each other.

Usually, when an LED is used as a light source, the directivity of light is high, and it is easy to irradiate light forward rather than laterally. Therefore, it is easy to form a dark part at a location between two adjacent light sources, and a diffusion plate Reflecting the reflected light hitting the back surface of the light again forward at the location is an important factor in bringing the light emitting surface of the lighting device into a uniform light emitting state.
In this respect, the reflecting plate 1x according to the present embodiment is provided with the flat portion 14 that directly faces the diffusion plate between the light sources, so that the lighting device emits light rather than using only the peripheral side wall 13x as a reflecting surface. The state can be made uniform.

For example, in the reflection plate in which a plurality of light sources are arranged vertically and horizontally as shown in FIG. 1 shown in the first embodiment and FIG. 5 shown in the second embodiment, the adjacent light sources The intermediate point is in a state like a ridgeline and has substantially no reflecting surface.
Therefore, in the reflector illustrated in the first embodiment, although it is difficult to expect a function of reflecting light forward at the location, the reflector 1x in the second embodiment has a flat portion 14. Therefore, the light diffusing plate receives a lot of light from the back side in this portion, and the light emission state of the lighting device can be made uniform.

In order to exhibit such an effect more uniformly in the illumination device, when producing an illumination device by combining a plurality of illumination units using the reflector 1x of the second embodiment, between adjacent illumination units. It is preferable to arrange so that the space | interval of the accommodating recessed parts in the reflecting plate of one illumination unit is maintained.
This will be described in more detail with reference to FIG. 5. If the interval between the receiving recesses 10x adjacent in the vertical direction in one reflector 1x is Da, the part 1fx is overlapped through the overlapping portion. It is preferable to configure the lighting device so that the distance between the adjacent recesses is also Da, and when the interval between the recesses 10x laterally adjacent in one reflector 1x is Db, It is preferable to configure the lighting device such that the distance between the housing recesses adjacent to each other through the portion where the flange portions 1fx are overlapped is also Db.

In order to arrange the lighting unit in this way to form a uniform lighting device in a light emitting state, the interval between the housing recesses adjacent in the vertical direction in the reflector is Da, and is adjacent to the high position collar 1fax. The distance from the housing recess to the tip of the high position collar 1fax is La1, the distance from the housing recess adjacent to the low position collar 1fbx to the tip of the low position collar 1fbx is La2, and the low position within this distance (La2) When the protrusion length of the flange portion 1fbx is La22, the reflector 1x may be formed so that the size of the flange portion satisfies the following formulas (1) and (2).
Da <(La1 + La2) <2Da (1)
(La1 + La2-La22) <Da (2)

Also in the lateral direction, the distance between the adjacent receiving recesses is Db, the distance from the receiving recess adjacent to the high position collar 1fax to the tip of the high position collar 1fax is Lb1, and the accommodation adjacent to the low position collar 1fbx When the distance from the concave portion to the tip of the low position collar 1fbx is Lb2, and the protrusion length of the low position collar 1fbx of the Lb2 is Lb22, the size of the collar is expressed by the following formulas (3) and (4). By forming the reflecting plate 1x so as to satisfy the above, it is possible to maintain the same interval as the interval of the accommodating recesses in the reflecting plate even between the adjacent reflecting plates by overlapping the flanges vertically.
Db <(Lb1 + Lb2) <2Db (3)
(Lb1 + Lb2-Lb22) <Db (4)

Satisfying the above expressions (1) and (3) is effective in constructing a uniform lighting device in a light emitting state from the distance from the housing recess to the tip of the high-position flange 1fax and from the housing recess. If the sum ((La1 + La2), (Lb1 + Lb2)) with the distance to the tip of the low-position flange 1fbx is less than the spacing (Da, Db) between the receiving recesses, a gap must be provided between adjacent reflectors. This is because the interval between the accommodating recesses in the reflecting plate cannot be maintained between the reflecting plates.
The sum of the distance from the housing recess to the tip of the high position collar 1fax and the distance from the housing recess to the tip of the low position collar 1fbx ((La1 + La2), (Lb1 + Lb2)) is twice the distance between the housing recesses. If it is (2Da, 2Db) or more, the tip of the low-position flange 1fbx hits the receiving recess of the adjacent reflector, and it is adjacent until the distance between the receiving recesses is the same as the interval (Da, Db) in the reflector. It becomes impossible to make the reflecting plate to approach.
In this sense, satisfying the above expressions (1) and (3) is important in constructing a lighting device having a uniform light emission state.

In addition, in the present embodiment, satisfying the above expressions (2) and (4) is effective in configuring a uniform lighting device in a light emitting state. Since the lower position flange 1fbx is stepped down with respect to the flat portion 14, the flange is flat on one of the two reflectors and the other reflector. This is because the overlapping width of the flange portion can ensure only the protruding length of the low-position flange portion 1fbx if the reflectors are made adjacent to each other so that the flat portion is flush with the flat portion.
That is, as shown in FIG. 5C, the protruding length of the low-position flange 1fbx (low-position flange) out of the distance (Lb2) from the accommodating recess in the lateral direction to the tip of the low-position flange 1fbx. (Lb22) and the width of the remaining flat portion 14b 'is "Lb21 (Lb2-Lb22)", the distance (Lb1) from the housing recess to the tip of the high-position flange 1fax and the flat portion When the combined length of the width 14b '(Lb21) exceeds the spacing (Db) between the receiving recesses in the lateral direction, the spacing between the receiving recesses is reflected while the flat portions are flush with each other between the adjacent reflectors. It is difficult to maintain the same as in the board.
In this sense, satisfying the above expressions (2) and (4) is important in constructing a lighting device having a uniform light emission state.

In addition, from the tip of the high position collar 1fax to the flat portion 14b ′ between the low position collar and the receiving recess 10x where the high position collar 1fax is overlapped, a symbol “ A clearance such as the width indicated by P ″ may be provided, and the tip of the high-position flange 1fax is brought into substantially abutting contact with the outer edge of the flat portion 14b ′ so that no clearance is substantially provided. May be.
However, when providing the clearance, if the length of one side of the notch portion CTx is the same as the width of the collar portion, a square hole whose length of one side corresponds to the clearance is formed at the intersection of the four reflectors. Since it will be in the open state, it is preferable to form the notch CTx as small as the clearance.

This clearance may be different between the vertical direction and the horizontal direction when a plurality of reflectors are arranged vertically and horizontally.
Also, the interval between the accommodating recesses may be different between the vertical interval (Da) and the horizontal interval (Db), and the width of the flat portion 14a between the accommodating recesses in the vertical direction and the horizontal direction. The width of the flat portion 14b may be different.
Furthermore, as a matter of course, the dimensions and the like of the collar portion may be different between the vertical direction and the horizontal direction.
Moreover, it is a matter of course that the shape of the housing recess is not limited to that illustrated above.

As described above, the reflecting plate according to the present embodiment can be easily used to manufacture a lighting device with little illuminance unevenness by being used as a constituent member of a lighting unit.
In the manufacture of the lighting device, it is not necessary to prepare a lighting unit by combining a reflector and an LED element in advance, and after arranging the required number of reflectors, a lighting device is manufactured by incorporating LED elements. However, the effect of the present invention is not impaired.
Further, it is a matter of course that various modified examples other than the examples shown here can be adopted without needing to be described in detail.

DESCRIPTION OF SYMBOLS 1: Reflecting plate, 1f: Gutter part, 10: Housing recessed part, 11e: Opening edge, 12: Bottom part, 13: Peripheral side wall, 13a-d, 13w-13z: Reflecting surface

Claims (8)

An accommodation recess for accommodating a light source is provided, and the accommodation recess has a bottom surface narrower than an opening edge thereof, and a peripheral side wall that extends outward from the outer edge of the bottom surface toward the opening edge, A reflecting plate formed so as to be able to reflect light emitted from a light source disposed on the bottom surface portion on the peripheral side wall;
A flange portion extending outward is provided on the outer peripheral portion, and is formed in a rectangular shape in plan view. A part of the flange portion is formed at a position lower than the other portions, and has the same shape. The lower position flange is formed along two sides from one corner of the rectangle to its diagonal so that the other reflectors and the flange can be stacked vertically and horizontally. And two corners which are formed along two sides opposite to the two sides, and which serve as a boundary between the low position collar and the high position collar. The reflector is characterized in that a notch portion is formed by notching the collar portion in the portion.   The reflector according to claim 1, wherein a plurality of the accommodating recesses are arranged. The plurality of receiving recesses are arranged at regular intervals in the vertical and horizontal directions, and in the vertical direction, the interval between the adjacent receiving recesses is Da, and from the receiving recess adjacent to the high-level ridge, The distance to the tip is La1, the distance from the housing recess adjacent to the lower collar to the tip of the lower collar is La2, and the protrusion length of the lower collar within this distance (La2) is La22. In the lateral direction, the distance between the adjacent receiving recesses is Db, the distance from the receiving recess adjacent to the high-level flange to the tip of the high-level flange is Lb1, and the storage adjacent to the low-level flange When the distance from the recess to the tip of the lower collar is Lb2, and the protrusion length of the lower collar within this distance (Lb2) is Lb22, the other reflector and the collar are moved up and down. Between the other reflectors when they are stacked vertically and horizontally. There As following equation may be to maintain the spacing of the accommodation recess to constant (1) to (4) satisfy all the claims 2 reflector according.
Da <(La1 + La2) <2Da (1)
(La1 + La2-La22) <Da (2)
Db <(Lb1 + Lb2) <2Db (3)
(Lb1 + Lb2-Lb22) <Db (4)   The reflector according to any one of claims 1 to 3, wherein the thermoplastic resin sheet is formed by sheet molding.   An illumination unit comprising: a light-emitting diode element as a light source; and the light-emitting diode element is accommodated in the accommodating recess of the reflecting plate according to any one of claims 1 to 4.   6. An illuminating device according to claim 5, wherein a plurality of the illuminating units are arranged so as to overlap the flange portions of the reflecting plate, and the plurality of illuminating units are covered with a single light diffusing plate.   The illumination unit according to claim 6, wherein the illumination unit includes the reflector according to claim 3, and the illumination units are arranged so that the spacing between the housing recesses in the reflector is maintained between the adjacent reflectors. apparatus.   8. A display device, wherein the illumination device according to claim 6 is used as a backlight.

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