JP5974451B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device that diffuses light from a light source unit by a light diffuser.

2. Description of the Related Art In recent years, with increasing interest in environmental problems, lighting devices that use light-emitting diode light sources as light sources are rapidly spreading because of their power saving and long life. By the way, since the light emitted from the light emitting diode light source has high straightness and hardly diffuses, an illumination device using the light emitting diode light source includes a light diffuser. For example, Patent Document 1 includes a light source unit in which a plurality of light-emitting diode light sources are linearly arranged, and a light diffuser for obtaining anti-glare properties by diffusing light from the light source unit. Is disclosed. As the light diffuser, for example, a light diffuser having a light diffusion layer containing particles in a binder, which is attached to a lighting device using a conventional straight tube fluorescent lamp (see Patent Document 2), is used. ing.
However, when the light diffusing body having the light diffusing layer described in Patent Document 2 is applied to a light source unit using the light emitting diode light source, although the antiglare property can be ensured, the illuminance of the lighting device becomes low. was there.
With respect to this problem, Patent Document 3 describes that a sheet having an uneven shape on at least one side is used as a light diffuser for the purpose of securing antiglare properties and illuminance.
Further, in Patent Document 4, in a surface light source device in which a plurality of light-emitting diode light sources are two-dimensionally distributed, two sheets having a concavo-convex shape on one side are arranged, and the tips of the convex portions of the sheets face the same direction. The use of a light diffuser arranged in this way is described.

Japanese Utility Model Publication No. 63-121461 JP-A-10-269825 JP 2010-129507 A International Publication No. 2010/110319

However, even if the light diffuser described in Patent Documents 3 and 4 is used in a lighting device, it has been difficult to sufficiently increase both the antiglare property and the illuminance.
This invention is made | formed in view of the said situation, and it aims at providing the illuminating device which can fully raise both anti-glare property and illumination intensity.

[1] In an illuminating device including a light source unit in which a plurality of light emitting diode light sources are linearly arranged and a light diffuser, the light diffuser accommodates the light source unit and is disposed on the light emitting side of the light source unit. A cylindrical cover having a first concavo-convex pattern formed on the peripheral surface and the light source unit and the cylindrical cover are arranged between the light source unit and the cylindrical cover so that the first concavo-convex pattern faces the surface opposite to the light source unit. A second concavo-convex pattern forming sheet on which two concavo-convex patterns are formed, and the first concavo-convex pattern includes a convex portion constituting a ridge line of the first concavo-convex pattern, and a concave portion between adjacent ridge lines. Are repeated along a direction in a range of ± 20 ° with respect to a direction parallel to the surface of the cylindrical cover and perpendicular to the arrangement direction of the plurality of light-emitting diode light sources. The uneven pattern is A convex portion constituting the ridge line of the second concavo-convex pattern and a concave portion between adjacent ridge lines are repeated along a direction in a range of ± 20 ° with respect to the arrangement direction of the plurality of light emitting diode light sources. In the second concavo-convex pattern, the most frequent pitch A of the concavo-convex pattern exceeds 1.0 μm and is 30 μm or less, and the ratio of the average depth B of the concavo-convex to the most frequent pitch A (B / A) is 0.1-3. 0.0 . A lighting device characterized by being 0.0 .
[2 ] The illumination device according to [1 ], wherein the first uneven pattern has a lenticular lens shape in which the pitch of the uneven pattern is 1 to 1000 μm.

  The lighting device of the present invention can sufficiently increase both the antiglare property and the illuminance.

It is a figure which shows typically the cross section of 1st and 4th embodiment of the illuminating device of this invention. It is a perspective view which shows the 1st uneven | corrugated pattern of the uneven | corrugated pattern formation sheet which comprises the illuminating device of 1st, 2nd, 3rd embodiment. It is a perspective view which shows the 2nd uneven | corrugated pattern of the uneven | corrugated pattern formation sheet which comprises the illuminating device of 1st, 2nd, 3rd embodiment. It is a figure which shows typically the cross section of 2nd and 5th embodiment of the illuminating device of this invention. It is a figure which shows typically the cross section of 3rd and 6th embodiment of the illuminating device of this invention. It is a perspective view which shows the lenticular lens pattern of the lenticular lens sheet which comprises the illuminating device of 4th, 5th, 6th embodiment.

“First Embodiment”
<Lighting device>
A first embodiment of the illumination device of the present invention will be described.
In FIG. 1, sectional drawing of the illuminating device of this embodiment is shown. The illumination device 1 according to the present embodiment includes a light source unit 10 and a light diffuser 20 provided on the light emission side of the light source unit 10.

(Light source unit)
The light source unit used in the present invention has a plurality of light emitting diode light sources arranged in a line. The light source unit 10 used in the present embodiment is a unit in which a plurality of light emitting diode light sources 11, 11,. Each light-emitting diode light source 11 is fixed to the support 12 and may be a shell type, a surface mount type, or a chip-on-board type.
The interval between the adjacent light emitting diode light sources 11 and 11 is preferably 1 to 100 mm, although it depends on the light emission intensity of the light emitting diode light source 11. If the distance between adjacent light emitting diode light sources 11 and 11 is equal to or less than the upper limit value, the illuminance in the longitudinal direction of the light source unit 10 can be easily made uniform. However, if the interval between the adjacent light-emitting diode light sources 11 and 11 is less than the lower limit value, the number of the light-emitting diode light sources 11 increases, resulting in high cost.
There is no restriction | limiting in particular as a material of the support body 12, Resin, a metal, etc. can be used suitably. The surface 12a on the light diffuser 20 side of the support 12 is preferably made of a metal mirror surface or a white reflective surface and has light reflectivity, since the light use efficiency becomes high.
In the present specification, the longitudinal direction of the light source unit 10 (the horizontal direction in FIG. 1) is referred to as the “X direction”. A direction parallel to the light source unit 10 and orthogonal to the X direction (a direction orthogonal to the paper surface in FIG. 1) is referred to as a “Y direction”. A direction (vertical direction in FIG. 1) perpendicular to the light source unit 10 and perpendicular to the X direction is referred to as a “Z direction”.

(Light diffuser)
The light diffuser 20 used in this embodiment includes a transparent first uneven pattern forming sheet 21 disposed on the light source unit 10 side and a transparent second uneven pattern forming sheet 22 disposed on the light emitting side. And have.
The first concavo-convex pattern forming sheet 21 includes the first concavo-convex pattern 21 a on the surface on the light source unit 10 side, and the second concavo-convex pattern forming sheet 22 is on the surface opposite to the light source unit 10. 22a.

[First uneven pattern, second uneven pattern]
The first concavo-convex pattern 21a is a wave pattern in which the concavo-convex portions (concave portion 21c and convex portion 21b) are repeated along a direction in a range of ± 20 ° with respect to the Y direction (see FIG. 2). In the first uneven pattern 21a, the unevenness is preferably repeated along a direction in a range of ± 10 ° with respect to the Y direction, and is repeated along a direction in a range of ± 5 ° with respect to the Y direction. Is more preferable, and it is particularly preferable to repeat along the Y direction.
The 2nd uneven | corrugated pattern 22a is a waveform pattern with which the unevenness | corrugation (recessed part 21c, the convex part 21b) is repeated along the direction of the range of +/- 20 degree with respect to X direction (refer FIG. 3). In the second concavo-convex pattern 22a, the concavo-convex is preferably repeated along a direction in a range of ± 10 ° with respect to the X direction, and is repeated along a direction within a range of ± 5 ° with respect to the X direction. Is more preferable, and it is particularly preferable to repeat along the X direction.
In the first concavo-convex pattern 21a and the second concavo-convex pattern 22a, when the concavo-convex is repeated along the direction in the range exceeding the above range, the effect of the present invention to increase both the antiglare property and the illuminance is hardly exhibited.
In both the first concavo-convex pattern 21a and the second concavo-convex pattern 22a, the tip of the convex portion 21b is rounded. Moreover, the height direction of the convex part 21b is along the Z direction.
Further, the repeating direction of the first uneven pattern 21a and the repeating direction of the second uneven pattern 22a preferably intersect within a range of 90 ° ± 20 °, and more preferably intersect within a range of 90 ° ± 10 °. It is preferable to cross at 90 °.

The most frequent pitch A of the second concavo-convex pattern 21a is preferably more than 1 μm and not more than 30 μm, more preferably more than 1 μm and not more than 25 μm, still more preferably more than 1 μm and not more than 20 μm. The most frequent pitch A of the second uneven pattern 22a is more than 1 μm and 30 μm or less, preferably more than 1 μm and 25 μm or less, more preferably more than 1 μm and 20 μm or less.
When the most frequent pitch A is less than or equal to the lower limit value, coloring may occur due to light interference, and when the upper limit value is exceeded, light diffusibility may be reduced.

In the present embodiment, the ridge lines of the concavo-convex patterns 21a and 22a meander, and the pitch between the adjacent convex portions 21b and 21b varies along the direction of the concavo-convex patterns 21a and 22a.
Here, the degree of variation in the uneven pitch of the uneven patterns 21a and 22a is referred to as the degree of orientation.
The greater the degree of orientation, the more uneven the pitch.

  In order to obtain the most frequent pitch A, the average depth B, and the degree of orientation of the concavo-convex patterns 21a, 22a, the top and cross sections of the concavo-convex patterns 21a, 22a are observed with an optical microscope, or the atomic force of the concavo-convex patterns 21a, 22a is measured. Observe with a microscope. In general, due to the difference in resolution of each microscope, observation with an optical microscope is suitable when the pitch and depth of the concavo-convex pattern is 1 μm or more, and observation with an atomic force microscope is suitable when the depth and depth are 1 μm or less. Yes. Therefore, observation is performed by appropriately selecting according to the size of the uneven pattern.

The most frequent pitch A and the degree of orientation of the concavo-convex patterns 21a and 22a can be obtained, for example, according to a method described in Japanese Patent Application Laid-Open No. 2009-122298.
First, after converting the image of the concavo-convex structure obtained by a microscope into a gray scale image, two-dimensional Fourier transform is performed. The frequency (Z _F ) of the Fourier transform image is smoothed to obtain a position (X _Fmax , Y _Fmax ) indicating the maximum frequency other than the center of the Fourier transform image. Then, the most frequent pitch A is _obtained from the expression of the most frequent pitch A = 1 / {√ {square root over (X _Fmax ² + Y _Fmax ² )}}. The most frequent pitch may be regarded as an average value of each pitch. The average pitch can also be obtained from an average value of 10 or more randomly extracted pitches from the cross-sectional view obtained from the microscope image, where the horizontal interval between adjacent concave portions is defined as the pitch.
The degree of orientation, first, by using the Fourier transform image obtained above to create a Fourier transform image rotated θ such that the maximum illuminance portion coincides on X _F axis. Next, a parallel auxiliary line Y ′ _F is drawn on the Y _F axis passing through (X _Fmax , Y _Fmax ), the auxiliary line Y ′ _F is taken as the horizontal axis, and the illuminance (Z _F axis) on the auxiliary line Y ′ _F is taken as the vertical axis. Y ' _F -Z _F diagram is created. Next, a Y " _F -Z _F diagram is created by dividing the value of the Y ' _F axis of the Y' _F -Z _F diagram by the reciprocal (1 / A) of the most frequent pitch A, and this Y" _F -Z _F diagram To obtain the half width W of the peak (the width of the peak at a height at which the frequency is half of the maximum value). This half width represents the degree of orientation. The larger the degree of orientation, the more meandering the pitch.

The degree of orientation is preferably 0.1 to 0.5. If the degree of orientation is 0.1 to 0.5, the unevenness of the pitches of the uneven patterns 21a and 22a is large, so that the light diffusibility of the first uneven pattern forming sheet 21 and the second uneven pattern forming sheet 22 is more Get higher. When the degree of orientation exceeds 0.5, the directivity of the concave / convex patterns 21a and 22a becomes too low and the illuminance tends to be low.
In order to make the degree of orientation within the predetermined range, a method of applying shrinkage stress when manufacturing the first uneven pattern forming sheet 21 and the second uneven pattern forming sheet 22 may be appropriately selected.

  It is preferable that ratio (B / A) of the average depth B of the unevenness with respect to the most frequent pitch A in the first uneven pattern 21a is 0.1 to 3.0, and preferably 0.5 to 2.5. More preferably, it is more preferably 0.5 to 1.0. The ratio (B / A) of the average depth B of the concavo-convex to the most frequent pitch A in the second concavo-convex pattern 22a is 0.1 to 3.0, preferably 0.5 to 2.5. More preferably, it is 0.5 to 1.0. When (B / A) is less than the lower limit value, the light diffusibility tends to decrease, and when the upper limit value is exceeded, the uneven patterns 21a and 22a can be easily formed.

The average depth means the average of the depth from the peak of the convex part 21b of the concave / convex patterns 21a and 22a to the bottom of the concave part 21c. The average depth B is obtained as follows. That is, the concavo-convex patterns 21a and 22a are observed with a microscope, and a cross-sectional view cut along the Y-axis direction is obtained from the observation. The depth to the bottom of one concave portion 21c is ½ of the sum of the distances in the Z direction from the peaks of the two adjacent convex portions 21b and 21b to the bottom of the concave portion 21c. That is, one depth _{b i} of the bottom of the recess 21c is the depth _{L i} of the bottom of the recess 21c as measured from the peak of one side of the projecting portion 21b with respect to the recess 21c, the peak of the other side of the protrusion 21b B _i = (L _i + R _i ) / 2 where R _i is the bottom depth of the recess 21c measured from the above. The average value of the depth b _i of each recess 21c thus determined is the average depth B, because it is not practical to determine the depth of all the concave portions 21c, 10 or more randomly extracted The average depth B is obtained from b _{i of}

The most frequent pitch A and the average depth B may be appropriately set according to the target antiglare property and illuminance, and may be the same for the first uneven pattern 21a and the second uneven pattern 22a. May be different.
When the first concavo-convex pattern 21a and the second concavo-convex pattern 22a have different mode pitches A and average depths B, the aspect ratios of the first concavo-convex pattern 21a and the second concavo-convex pattern 22a are appropriately set. By adjusting, the light diffusion angle can be adjusted. Specifically, the diffusion angle increases as the aspect ratio increases.
Therefore, by adjusting the aspect ratio of each of the first concavo-convex pattern 21a and the second concavo-convex pattern 22a, it is possible to adjust the antiglare property and the illuminance according to the use of the lighting device. For example, in an illumination device for a showcase whose main purpose is to illuminate a product, the illuminance is more important than the antiglare property, so the first unevenness is obtained so that a certain degree of antiglare property and high illuminance can be obtained. The aspect ratio of each of the pattern 21a and the second uneven pattern 22a can be adjusted.
In order to adjust the aspect ratio, the mode pitch A or the average depth B may be adjusted. However, since the average depth B can be adjusted more easily than the mode pitch A, the aspect ratio is adjusted. When doing so, the average depth B is usually adjusted.

Each uneven | corrugated pattern formation sheet | seat 21 and 22 may be formed in 1 layer, respectively, and may be formed in 2 layers.
When the concavo-convex pattern forming sheets 21 and 22 are formed in two layers, the base material made of a transparent resin and the Young's modulus at the processing temperature when obtaining the concavo-convex pattern forming sheets 21 and 22 are higher than the base material. It is preferable to be comprised with the hard layer 0.01-300GPa high. Here, the processing temperature is, for example, a heating temperature at the time of heat shrinkage in the method for manufacturing a concavo-convex pattern forming sheet described later. The Young's modulus is a value measured according to JIS K 7113-1995.

  Examples of the transparent resin constituting the substrate include polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, polystyrene resins such as styrene-butadiene block copolymers, polyvinyl chloride, polyvinylidene chloride, and polydimethylsiloxane. Silicone resin, fluororesin, ABS resin, polyamide, acrylic resin, polycarbonate, polycycloolefin, and the like.

The hard layer may be a resin, or a metal or a metal compound.
The resin constituting the hard layer is appropriately selected depending on the type of resin constituting the base material. For example, polyvinyl alcohol, polystyrene, acrylic resin, styrene-acrylic copolymer, styrene-acrylonitrile copolymer, polyethylene terephthalate Polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethersulfone, fluororesin, and the like can be used. Since the uneven patterns 21a and 22a can be easily formed in the manufacture of the uneven pattern forming sheet described later, the difference between the glass transition temperature Tg ₂ of the resin constituting the hard layer and the glass transition temperature Tg ₁ of the resin constituting the substrate. (Tg ₂ −Tg ₁ ) is preferably 10 ° C. or higher.
When the hard layer is made of a resin, the thickness of the hard layer is preferably more than 0.05 μm and 5.0 μm or less. If the thickness of the hard layer exceeds 0.05 μm and is 5 μm or less, the uneven pattern forming sheets 21 and 22 can be easily manufactured.

Examples of the metal constituting the hard layer include gold, aluminum, silver, copper, germanium, indium, magnesium, niobium, palladium, lead, platinum, silicon, tin, titanium, vanadium, zinc, and bismuth.
Examples of the metal compound constituting the hard layer include titanium oxide, aluminum oxide, zinc oxide, magnesium oxide, tin oxide, copper oxide, indium oxide, cadmium oxide, lead oxide, silicon oxide, barium fluoride, calcium fluoride, and fluoride. Examples include magnesium, zinc sulfide, and gallium arsenide.
When the hard layer is a metal or a metal compound, the thickness of the hard layer is preferably 1 to 50 nm. If the thickness of the hard layer is 1 nm or more, defects are less likely to occur in the hard layer, and if the thickness is 50 nm or less, sufficient light transmission can be secured and the uneven pattern forming sheets 21 and 22 are easily manufactured. it can.

  As a method for producing a concavo-convex pattern forming sheet composed of two layers, a laminated film is formed by providing a hard layer on one side of a transparent resin substrate made of a heat-shrinkable film, and the laminated film is heated. There is a method of deforming the hard layer by folding the base material so as to be folded. Thus, the uneven | corrugated pattern 21a, 22a can be formed by changing so that a hard layer may be folded.

When the concavo-convex pattern forming sheets 21 and 22 are composed of one layer, it is preferable to be composed of a transparent resin. The transparent resin may be a thermoplastic resin or a thermosetting resin (thermosetting prepolymer or monomer cured product). Examples of the thermoplastic resin include acrylic resin, polyolefin, polyester, and the like. Examples of thermosetting prepolymers include epoxy acrylate, epoxidized oil acrylate, urethane acrylate, unsaturated polyester, polyester acrylate, polyether acrylate, vinyl / acrylate, polyene / acrylate, silicon acrylate, polybutadiene, and polystyrylmethyl methacrylate. It is done. Examples of the thermosetting monomer include aliphatic acrylate, alicyclic acrylate, aromatic acrylate, hydroxyl group-containing acrylate, allyl group-containing acrylate, glycidyl group-containing acrylate, carboxy group-containing acrylate, and halogen-containing acrylate.
As a method for producing a concavo-convex pattern forming sheet composed of one layer, a nickel stamper is formed by plating the surface of the concavo-convex pattern forming sheet composed of two layers with the concavo-convex patterns 21a and 22a with nickel or the like. And a method of transferring the obtained nickel stamper to a thermoplastic resin, thermosetting resin or ultraviolet curable resin (hereinafter referred to as “transfer method”).
The concavo-convex pattern forming sheet composed of one layer may be laminated with a base material made of a polymer such as polyethylene terephthalate, polycarbonate, polymethyl methacrylate, etc. on the surface where the concavo-convex patterns 21a, 22a are not formed.

(Function and effect)
In the illuminating device 1 of this embodiment, the light emitted from the light source unit 10 reaches the first uneven pattern forming sheet 21 with almost no diffusion, and is diffused mainly in the Y direction by the first uneven pattern 21a. . Next, the light incident on the first uneven pattern forming sheet 21 passes through the first uneven pattern forming sheet 21 and then enters the second uneven pattern forming sheet 22. The light incident on the second concavo-convex pattern forming sheet 22 is transmitted through the second concavo-convex pattern forming sheet 22 and then diffused and emitted mainly in the X direction by the second concavo-convex pattern 22a. Therefore, according to the light diffuser 20 in which the first concavo-convex pattern forming sheet 21 and the second concavo-convex pattern forming sheet 22 are combined, light from the light source unit 10 having high straightness is transmitted in the X direction and the Y direction. Can be diffused in both directions.
Further, as a result of investigations by the present inventors, the tip of the convex portion 21b of the first concave / convex pattern 21a that diffuses light in the Y direction is directed toward the light source unit 10, and the second concave / convex pattern that diffuses light in the X direction. It turned out that the light from the light source unit 10 diffuses moderately because the front-end | tip of the convex part 21b of 22a is orient | assigned to the light source unit 10 and the other side.
From the above, according to the illumination device 1, both the antiglare property and the illuminance can be sufficiently increased.

“Second Embodiment”
A second embodiment of the illumination device of the present invention will be described.
In FIG. 4, sectional drawing of the illuminating device of this embodiment is shown. The illuminating device 2 of this embodiment includes a light source unit 10 and a light diffuser 30 disposed on the light emission side of the light source unit 10. The light source unit 10 is the same as the light source unit 10 used in the first embodiment.

(Light diffuser)
The light diffuser 30 used in the present embodiment includes a second uneven pattern forming sheet 22 disposed on the light source unit 10 side and a first uneven pattern forming sheet 21 disposed on the light emitting side.
Here, as in the first embodiment, the first uneven pattern forming sheet 21 used in this embodiment has unevenness (concave part 21c and convex part 21b) on the surface on the light source unit 10 side in the Y direction. The first concavo-convex pattern 21a is repeated along the direction in the range of ± 20 °. Further, as in the first embodiment, the second uneven pattern forming sheet 22 used in the present embodiment has unevenness (concave part 21c, convex part 21b) on the surface opposite to the light source unit 10 side in the X direction. Is provided with a second concavo-convex pattern 22a that repeats along a direction in a range of ± 20 °.
The first uneven pattern 21a and the second uneven pattern 22a in the present embodiment are also the same as the first uneven pattern 21a and the second uneven pattern 22a in the first embodiment, and the preferred aspects are also the same. is there.

(Function and effect)
In the illumination device 2 of the present embodiment, the light emitted from the light source unit 10 is incident on the second uneven pattern forming sheet 22. The light incident on the second concavo-convex pattern forming sheet 22 is transmitted through the second concavo-convex pattern forming sheet 22 and then diffused and emitted mainly in the X direction by the second concavo-convex pattern 22a. The light emitted from the second concavo-convex pattern forming sheet 22 and reaching the first concavo-convex pattern forming sheet 21 is diffused mainly in the Y direction in the first concavo-convex pattern 21 a, and the first concavo-convex pattern forming sheet 21. After passing through, the light is emitted. Therefore, according to the light diffuser 30 in which the first uneven pattern forming sheet 21 and the second uneven pattern forming sheet 22 are combined, the light from the light source unit 10 is diffused in both the X direction and the Y direction. Can do. In addition, the tip of the convex portion 21b of the first concavo-convex pattern 21a is directed to the light source unit 10 side, and the tip of the convex portion 21b of the second concavo-convex pattern 22a is directed to the side opposite to the light source unit 10, thereby light diffusion. Since the property is moderate, both the antiglare property and the illuminance can be sufficiently increased even by the lighting device 2.

“Third Embodiment”
A third embodiment of the illumination device of the present invention will be described.
In FIG. 5, sectional drawing of the illuminating device of this embodiment is shown. The illuminating device 3 of the present embodiment includes a light source unit 10 and a light diffuser 40 disposed on the light emission side of the light source unit 10. The light source unit 10 is the same as the light source unit 10 used in the first embodiment.

(Light diffuser)
The light diffuser 40 used in the present embodiment is composed of a single uneven pattern forming sheet 41, and unevenness (concave part 21c, convex part 21b) is ± 20 ° with respect to the Y direction on the surface on the light source unit 10 side. The first concavo-convex pattern 41a (see FIG. 2) is repeated along the direction of the range, and concavo-convex portions (concave portions 21c and bulge portions 21b) are formed on the surface opposite to the light source unit 10 side with respect to the X direction. A second concavo-convex pattern 41b (see FIG. 3) is provided that repeats along the direction in the range of ± 20 °.
The first uneven pattern 41a and the second uneven pattern 41b in the present embodiment are also the same as the first uneven pattern 41a and the second uneven pattern 41b in the first embodiment, and the preferred aspects are also the same. is there.
The concavo-convex pattern forming sheet 41 can be obtained by forming concavo-convex on each surface of a sheet without concavo-convex so that the concavo-convex directions are orthogonal to each other by a transfer method.

(Function and effect)
In the illumination device 3 of the present embodiment, the light emitted from the light source unit 10 reaches the concave / convex pattern forming sheet 41 and diffuses mainly in the Y direction by the first concave / convex pattern 41a. Next, the light incident on the concavo-convex pattern forming sheet 41 passes through the concavo-convex pattern forming sheet 41, and then diffuses and emits mainly in the X direction by the second concavo-convex pattern 41b. Therefore, according to the light diffuser 40, the light from the light source unit 10 can be diffused in both the X direction and the Y direction. In addition, the tip of the convex portion 21b of the first concavo-convex pattern 41a is directed to the light source unit 10 side, and the tip of the convex portion 21b of the second concavo-convex pattern 41b is directed to the side opposite to the light source unit 10, thereby light diffusion. Since the property is moderate, both the antiglare property and the illuminance can be sufficiently increased even by the lighting device 3.
Furthermore, since the illuminating device 3 of this embodiment has one uneven | corrugated pattern formation sheet 41, it can be reduced in thickness easily.

“Fourth Embodiment”
The 4th Embodiment of the illuminating device of this invention is described.
In FIG. 1, sectional drawing of the illuminating device of this embodiment is shown. The illuminating device 4 of this embodiment includes a light source unit 10 and a light diffuser 50 disposed on the light emission side of the light source unit 10. The light source unit 10 is the same as the light source unit 10 used in the first embodiment.

(Light diffuser)
The light diffuser 50 used in the present embodiment includes a transparent first uneven pattern forming sheet 51 disposed on the light source unit 10 side and a transparent second uneven pattern forming sheet 22 disposed on the light emitting side. And have.
Here, the 1st uneven | corrugated pattern formation sheet 51 used by this embodiment is a lenticular lens sheet, is equipped with the 1st uneven | corrugated pattern 51a in the surface at the side of the light source unit 10, and the 2nd uneven | corrugated pattern formation sheet 22 is The second concavo-convex pattern 22 a is provided on the surface opposite to the light source unit 10.

[First uneven pattern, second uneven pattern]
The first concavo-convex pattern 51a has concavo-convex portions (concave portions 51c, convex portions 51b) repeated along a direction in a range of ± 20 ° with respect to the Y direction of the light source unit 10, and the convex portions 51b are in the width direction. This is a lenticular lens pattern having a substantially semicircular shape that is highest at the center of the center (see FIG. 6).
The second concavo-convex pattern 22a is the same as the concavo-convex pattern 22a of the first embodiment, and the preferred embodiment is also the same.

The uneven pitch of the uneven pattern 51a is preferably 1 to 1000 μm, and more preferably 10 to 500 μm. When the pitch is less than 1 μm, coloring may occur due to light interference. When the pitch exceeds 1000 μm, it is difficult to obtain the effects described below.
The height of the concavo-convex pattern 51a is preferably 10% or more when the pitch is 100% from the viewpoint of the effects described later.

The uneven pattern forming sheet 51 may be formed of one layer or may be formed of two layers.
When the uneven | corrugated pattern formation sheet 51 is comprised by 1 layer, it is preferable to comprise with transparent resin. The transparent resin may be a thermoplastic resin or a thermosetting resin (thermosetting prepolymer or monomer cured product). Examples of the thermoplastic resin include acrylic resin, polyolefin, polyester, and the like. Examples of thermosetting prepolymers include epoxy acrylate, epoxidized oil acrylate, urethane acrylate, unsaturated polyester, polyester acrylate, polyether acrylate, vinyl / acrylate, polyene / acrylate, silicon acrylate, polybutadiene, and polystyrylmethyl methacrylate. It is done. Examples of the thermosetting monomer include aliphatic acrylate, alicyclic acrylate, aromatic acrylate, hydroxyl group-containing acrylate, allyl group-containing acrylate, glycidyl group-containing acrylate, carboxy group-containing acrylate, and halogen-containing acrylate.
Examples of a method for producing a concavo-convex pattern forming sheet composed of one layer include a transfer method using a metal roll on which a lenticular lens pattern is formed by cutting or the like as a mold.
When the concavo-convex pattern forming sheet 51 is composed of two layers, a polymer such as polyethylene terephthalate, polycarbonate, polymethyl methacrylate, etc. is formed on the surface of the concavo-convex pattern forming sheet composed of one layer where the concavo-convex pattern 51a is not formed. The base material which consists of is laminated | stacked.

(Function and effect)
In the illuminating device 4 of the present embodiment, the light emitted from the light source unit 10 reaches the first uneven pattern forming sheet 51 with almost no diffusion, and diffuses mainly in the Y direction by the first uneven pattern 51a. . Next, the light incident on the first uneven pattern forming sheet 51 passes through the first uneven pattern forming sheet 51 and then enters the second uneven pattern forming sheet 22. The light incident on the second concavo-convex pattern forming sheet 22 is transmitted through the second concavo-convex pattern forming sheet 22 and then diffused and emitted mainly in the X direction by the second concavo-convex pattern 22a. Therefore, according to the light diffuser 50 in which the first concavo-convex pattern forming sheet 51 and the second concavo-convex pattern forming sheet 22 are combined, light from the light source unit 10 having high straightness is transmitted in the X direction and the Y direction. Can be diffused in both directions.
Furthermore, as a result of investigations by the present inventors, the tip of the convex portion of the first concave / convex pattern 51a that diffuses light in the Y direction is directed toward the light source unit 10, and the second concave / convex pattern that diffuses light in the X direction. It turned out that the light from the light source unit 10 diffuses moderately because the front-end | tip of the convex part 21b of 22a is orient | assigned to the light source unit 10 and the other side.
From the above, according to the illuminating device 4, both the antiglare property and the illuminance can be sufficiently increased.
It is not preferable to use a lenticular lens pattern similar to the concavo-convex pattern 51a in place of the second concavo-convex pattern 22a because appearance irregularities due to periodic bright spots often occur.

“Fifth Embodiment”
A fifth embodiment of the illumination device of the present invention will be described.
In FIG. 4, sectional drawing of the illuminating device of this embodiment is shown. The illuminating device 5 of the present embodiment includes a light source unit 10 and a light diffuser 60 disposed on the light emission side of the light source unit 10. The light source unit 10 is the same as the light source unit 10 used in the first embodiment.

(Light diffuser)
The light diffuser 60 used in the present embodiment includes a second uneven pattern forming sheet 22 disposed on the light source unit 10 side, and a first uneven pattern forming sheet 51 disposed on the light emitting side.
Here, the 1st uneven | corrugated pattern formation sheet 51 used by this embodiment is a lenticular lens sheet similarly to 4th Embodiment, and an unevenness | corrugation is +/- with respect to the Y direction on the surface at the light source unit 10 side. A first concavo-convex pattern 51a is provided that repeats along a direction in the range of 20 °. Further, the second uneven pattern forming sheet 22 used in the present embodiment has an unevenness of ± 20 ° with respect to the X direction on the surface opposite to the light source unit 10 side, as in the first embodiment. The second concavo-convex pattern 22a is repeated along the direction.
The first uneven pattern 51a and the second uneven pattern 22a in the present embodiment are also the same as the first uneven pattern 51a and the second uneven pattern 22a in the fourth embodiment, and the preferred aspects are also the same. is there.

(Function and effect)
In the illuminating device 5 of the present embodiment, the light emitted from the light source unit 10 enters the second uneven pattern forming sheet 22. The light incident on the second concavo-convex pattern forming sheet 22 is transmitted through the second concavo-convex pattern forming sheet 22 and then diffused and emitted mainly in the X direction by the second concavo-convex pattern 22a. The light emitted from the second concavo-convex pattern forming sheet 22 and reaching the first concavo-convex pattern forming sheet 51 is diffused mainly in the Y direction in the first concavo-convex pattern 51 a, and the first concavo-convex pattern forming sheet 51. After passing through, the light is emitted. Therefore, according to the light diffuser 60 in which the first uneven pattern forming sheet 51 and the second uneven pattern forming sheet 22 are combined, the light from the light source unit 10 is diffused in both the X direction and the Y direction. Can do. In addition, the tip of the convex portion of the first concavo-convex pattern 51a is directed to the light source unit 10 side, and the tip of the convex portion 21b of the second concavo-convex pattern 22a is directed to the side opposite to the light source unit 10, thereby light diffusibility. Therefore, both the anti-glare property and the illuminance can be sufficiently increased by the lighting device 5.

“Sixth Embodiment”
A sixth embodiment of the illumination device of the present invention will be described.
In FIG. 5, sectional drawing of the illuminating device of this embodiment is shown. The illuminating device 6 of this embodiment includes a light source unit 10 and a light diffuser 70 disposed on the light emission side of the light source unit 10. The light source unit 10 is the same as the light source unit 10 used in the first embodiment.

(Light diffuser)
The light diffuser 70 used in the present embodiment is composed of one uneven pattern forming sheet 71, and the surface of the light source unit 10 side has unevenness periodically along a direction in a range of ± 20 ° with respect to the Y direction. The first concavo-convex pattern 71a (see FIG. 6), which is a lenticular lens, is provided, and the concavo-convex portions (concave portion 21c and convex portion 21b) on the surface opposite to the light source unit 10 side are ± A second concavo-convex pattern 41b (see FIG. 3) is provided that repeats along the direction of the 20 ° range.
The first uneven pattern 71a and the second uneven pattern 41b in the present embodiment are the same as the first uneven pattern 51a and the second uneven pattern 22a in the fourth embodiment, and the preferred aspects are also the same. is there.
The concavo-convex pattern forming sheet 71 can be obtained by forming concavo-convex on both surfaces of a sheet without concavo-convex so that the directions of the concavo-convex are orthogonal to each other by a transfer method.

(Function and effect)
In the illumination device 6 of the present embodiment, the light emitted from the light source unit 10 reaches the concave / convex pattern forming sheet 71 and diffuses mainly in the Y direction in the first concave / convex pattern 71a. Next, the light incident on the concavo-convex pattern forming sheet 71 passes through the concavo-convex pattern forming sheet 71, and then diffuses and emits mainly in the X direction by the second concavo-convex pattern 41b. Therefore, according to the light diffuser 70, the light from the light source unit 10 can be diffused in both the X direction and the Y direction. In addition, the tip of the convex portion of the first concavo-convex pattern 71a is directed to the light source unit 10 side, and the tip of the convex portion 21b of the second concavo-convex pattern 41b is directed to the side opposite to the light source unit 10, thereby diffusing light. Therefore, both the antiglare property and the illuminance can be sufficiently increased by the lighting device 6.
Furthermore, since the illuminating device 6 of this embodiment has one uneven | corrugated pattern formation sheet 71, it can be reduced in thickness easily.

"Other embodiments"
In addition, this invention is not limited to the said embodiment.
The light source unit 10 may be a linear unit in which a plurality of light emitting diode light sources 11, 11... Are linearly arranged in a plurality of rows. When the plurality of light-emitting diode light sources 11, 11... Are linearly arranged in a plurality of rows, the light-emitting diode light sources 11, 11 are also straight in the Y direction orthogonal to the X direction (longitudinal direction of the light source unit 10). However, the arrangement is not limited to this. For example, the light emitting diode light sources 11 and 11 may be arranged in a zigzag manner in the Y direction.
When the plurality of light-emitting diode light sources 11, 11... Are linearly arranged in a plurality of rows, the ratio (C / D) of the length C in the X direction to the length D in the Y direction. 2 or more. Here, the length C in the X direction is specifically the length between the light emitting diode light sources at both ends in the X direction, and the length D in the Y direction is the length between the light emitting diode light sources at both ends in the Y direction. That's it. When C / D is less than the lower limit, the illuminance is not sufficiently increased even when the light diffusers 20, 30, 40, 50, 60, 70 are used. C / D is preferably 5 to 500, and more preferably 10 to 300.
Moreover, the unevenness | corrugation of the uneven | corrugated pattern formation sheet 21,22,41 used by each embodiment does not meander, and may be linear form.

(Manufacturing example 1) Preparation of uneven | corrugated pattern formation sheet Polymethyl methacrylate (LH-101-10 by Fujikura Kasei Co., Ltd., mass average molecular weight 560000, polymerization dispersion degree (Mw / Mn) 3.4, glass transition temperature 100 degreeC). 50 μm thick polyethylene terephthalate shrink film (Mitsubishi Resin Hissippet LX-61S, glass transition temperature 70 ° C.) having a thickness of 50 μm that is heated and shrunk mainly in a uniaxial direction (width direction) by gravure coating. On one side of the coating, the coating thickness after drying was 2 μm. Thereby, the lamination sheet in which the surface smooth layer was formed on both surfaces of the polyethylene terephthalate shrink film was obtained.
Next, the laminated sheet is heated at 100 ° C. for 1 minute to cause heat shrinkage to 40% of the length before heating (ie, shrink at a shrinkage rate of 60%), and the hard layer is orthogonal to the shrinking direction. A concavo-convex pattern-forming sheet original plate having a wavy concavo-convex pattern having periodicity along the direction was obtained.
Next, nickel plating was applied to the surface on which the uneven pattern of the obtained uneven pattern forming sheet original plate was formed, and the nickel plating was peeled off to obtain a nickel plating stamper having a thickness of 300 μm. An uncured ultraviolet curable resin composition containing an epoxy acrylate prepolymer, 2-ethylhexyl acrylate and a benzophenone photopolymerization initiator was applied to the surface of the nickel plating stamper on which the concavo-convex pattern was formed.
Next, a polyethylene terephthalate film having a thickness of 100 μm was placed on the surface of the uncured UV curable resin composition coating film not in contact with the nickel plating stamper, and pressed to bring it into close contact.
Next, ultraviolet rays were irradiated from above the polyethylene terephthalate film to cure the uncured ultraviolet curable resin composition, and the cured product thus obtained was peeled from the nickel plating stamper.
As a result, a corrugated concave / convex pattern in which irregularities are repeatedly formed along one direction and the irregularities meander (mode pitch A: 17.2 μm, ratio of average depth B of irregularities to mode pitch A ( An uneven pattern forming sheet having B / A): 0.6 and orientation degree: 0.3) was obtained.

(Manufacture example 2) Preparation of uneven | corrugated pattern formation sheet B Polymethyl methacrylate (LH-101-10 by Fujikura Kasei Co., Ltd., mass mean molecular weight 560000, polymerization dispersion degree (Mw / Mn) 3.4, glass transition temperature 100 degreeC) A 30 μm-thick rectangular sheet of polyethylene terephthalate shrink film (Mitsubishi Resin Hissippet LX-61S, glass transition temperature 70 ° C.) that is heated and shrunk mainly in one axial direction (width direction) by gravure coating. ) Was applied so that the coating thickness after drying was 2 μm. Thereby, the lamination sheet in which the surface smooth layer was formed on both surfaces of the polyethylene terephthalate shrink film was obtained.
Next, the laminated sheet is heated at 100 ° C. for 1 minute to cause thermal contraction to 38% of the length before heating (ie, contract at a contraction rate of 62%), and the hard layer is orthogonal to the contraction direction. A concavo-convex pattern-forming sheet original plate having a wavy concavo-convex pattern having periodicity along the direction was obtained.
In the same manner as in Example 1 except that this concavo-convex pattern forming sheet original plate was used, a concavo-convex pattern forming sheet having a corrugated concavo-convex pattern in which concavo-convex was repeatedly formed along one direction and the concavo-convex was meandered Obtained. The mode pitch A of the concavo-convex pattern of this concavo-convex pattern forming sheet was 17.0 μm, the ratio of the average depth B of the concavo-convex to the mode pitch A (B / A) was 0.7, and the degree of orientation was 0.3. .

(Manufacture example 3) Preparation of uneven | corrugated pattern formation sheet C Polymethyl methacrylate (LH-101-10 by Fujikura Kasei Co., Ltd., mass mean molecular weight 560000, polymerization dispersion degree (Mw / Mn) 3.4, glass transition temperature 100 degreeC) A 50 μm-thick rectangular polyethylene terephthalate shrink film (Mitsubishi Resin Hissippet LX-61S, glass transition temperature 70 ° C.) that is heated and shrunk mainly in one axial direction (width direction) by gravure coating. ) Was applied so that the coating thickness after drying was 2 μm. Thereby, the lamination sheet in which the surface smooth layer was formed on both surfaces of the polyethylene terephthalate shrink film was obtained.
Next, the laminated sheet is heated at 100 ° C. for 1 minute to cause heat shrinkage to 60% of the length before heating (ie, shrink at a shrinkage rate of 40%), and the hard layer is orthogonal to the shrinking direction. A concavo-convex pattern-forming sheet original plate having a wavy concavo-convex pattern having periodicity along the direction was obtained.
In the same manner as in Example 1 except that this concavo-convex pattern forming sheet original plate was used, a concavo-convex pattern forming sheet having a corrugated concavo-convex pattern in which concavo-convex was repeatedly formed along one direction and the concavo-convex was meandered Obtained. The mode pitch A of the concavo-convex pattern of this concavo-convex pattern forming sheet was 17.2 μm, the ratio of the average depth B of the concavo-convex to the mode pitch A (B / A) was 0.54, and the degree of orientation was 0.3. .

(Production Example 4) Production of Lenticular Lens Sheet Copper was plated on a stainless steel roll having a width of 1,000 mm and a diameter of 250 mm. Using a semicircular metal tool in the circumferential direction of the roll, irregularities having a shape reversed with respect to the irregularities of the lenticular lens shown in FIG. 6 were formed by cutting. At that time, the pitch of the concaves and convexes was 200 μm, and the depth of the concaves was 70 μm. Thereby, the roll type | mold by which the unevenness | corrugation of the lenticular lens shape was formed in the surrounding surface was obtained.
An uncured ultraviolet curable resin composition containing an epoxy acrylate prepolymer, 2-ethylhexyl acrylate, and a benzophenone photopolymerization initiator was applied to this roll type.
Subsequently, a polyethylene terephthalate film having a thickness of 100 μm was superposed on the surface of the uncured ultraviolet curable resin composition that was not in contact with the roll mold, and pressed to bring it into close contact.
Next, ultraviolet rays were irradiated from above the polyethylene terephthalate film to cure the uncured ultraviolet curable resin composition, and the cured product thus obtained was peeled from the roll mold.
As a result, a lenticular lens sheet was obtained in which a lenticular lens pattern having a pitch of 200 μm and a height of 70 μm was periodically formed along one direction.

(Production Example 5) Production of light source unit A Six light-emitting diode light sources are linearly mounted on an aluminum substrate so as to have a length of 6 cm, and these are installed inside a cylindrical acrylic resin cover. To obtain a light source unit A.

(Production Example 6) Production of light source unit B A light-emitting diode side (inside) of a cylindrical acrylic resin cover is formed by extrusion to form a lenticular lens pattern having a pitch of 500 μm and a height of 200 μm. A light source unit B was produced in the same manner as in Production Example 5 except that it was formed so as to repeat periodically along the direction (Y direction) orthogonal to the direction (X direction).

(Production Example 7) Production of light source unit C A lenticular lens pattern having a pitch of 500 μm and a height of 200 μm is formed by extrusion on the opposite side (outside) of the light-emitting diode of the cylindrical acrylic resin cover. A light source unit C was manufactured in the same manner as in Production Example 5 except that the light source unit C was formed so as to repeat periodically along the direction (Y direction) orthogonal to the arrangement direction (X direction).

( Reference Example A )
The two concavo-convex pattern forming sheets obtained in Production Example 1 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped with each other so that the convex portion tips of the respective concavo-convex pattern forming sheets are opposite to each other. A light diffusing material facing was obtained. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the convex portion tip of the concave / convex pattern 21a in which the concave and convex portions are repeated along the Y direction is directed to the light source unit 10 side, and the concave and convex portions are along the X direction on the opposite side to the light source unit 10. Then, the light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated was directed.

( Reference Example B )
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the concavo-convex surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the convex portion tip of the concave / convex pattern 21a in which the concave and convex portions are repeated along the Y direction is directed to the light source unit 10 side, and the concave and convex portions are along the X direction on the opposite side to the light source unit 10. Then, the light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated was directed.

(Comparative Example 1)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the light diffuser was arranged on the side opposite to the light source unit 10 such that the tip of the convex part of the concave / convex pattern 22a in which the concave / convex pattern repeats along the X direction.

(Comparative Example 2)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the light diffuser was arranged on the light source unit 10 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X direction.

(Comparative Example 3)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the concavo-convex surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, on the side opposite to the light source unit 10, the tip of the convex portion of the concave / convex pattern 21a in which the concave / convex repeats along the Y direction faces, and the concave / convex on the light source unit 10 side along the X direction. Then, the light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated was directed.

(Comparative Example 4)
The two concavo-convex pattern forming sheets obtained in Production Example 1 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped with each other so that the convex portion tips of the respective concavo-convex pattern forming sheets are opposite to each other. A light diffusing material facing was obtained. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, on the side opposite to the light source unit 10, the tip of the convex portion of the concave / convex pattern 21a in which the concave / convex repeats along the Y direction faces, and the concave / convex on the light source unit 10 side along the X direction. Then, the light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated was directed.

(Comparative Example 5)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the light diffuser was disposed on the side opposite to the light source unit 10 such that the tip of the convex portion of the concave / convex pattern 21a in which the concave / convex portions are repeated along the Y direction.

(Comparative Example 6)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 1, the light diffuser was arranged on the light source unit 10 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X direction.

( Reference Example C )
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Reference Example A.

( Reference Example D )
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Reference Example B.

(Comparative Example 7)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 1.

(Comparative Example 8)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 2.

(Comparative Example 9)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 3.

(Comparative Example 10)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 4.

(Comparative Example 11)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 5.

(Comparative Example 12)
Except having changed the uneven | corrugated pattern formation sheet into the uneven | corrugated pattern formation sheet (Optical Solutions company make, lens diffuser plate LSD 60 degrees x1 degree) which has the uneven pattern in which the linear unevenness | corrugation was repeatedly formed along one direction. A lighting device was obtained in the same manner as in Comparative Example 6.

( Reference Example E )
The concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped to form each concavo-convex pattern forming sheet. A light diffusing body was obtained with the tips of the convex portions facing opposite sides. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the convex portion tip of the lenticular lens pattern 51a in which the concave and convex portions repeat along the Y direction faces the light source unit 10 side, and the concave and convex portions in the X direction on the opposite side to the light source unit 10. The light diffusing body was arranged so that the tips of the convex portions of the concave / convex pattern 22a repeated along the surface faced.

( Reference Example F )
The concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the convex portion tip of the lenticular lens pattern 51a in which the concave and convex portions repeat along the Y direction faces the light source unit 10 side, and the concave and convex portions in the X direction on the opposite side to the light source unit 10. The light diffusing body was arranged so that the tips of the convex portions of the concave / convex pattern 22a repeated along the surface faced.

(Example 7)
The concavo-convex pattern forming sheet obtained in Production Example 1 is arranged on the inner peripheral surface of the acrylic resin cover with a lenticular lens pattern of the optical unit B obtained in Production Example 6 so that the concavo-convex portions are orthogonal to each other. The lighting device was obtained by attaching the surfaces so as to face each other.

(Comparative Example 13)
The light-diffusing body is formed by arranging the concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 so that the respective concavo-convex portions are orthogonal to each other, and the concavo-convex surface and the non-concave surface are overlapped. Got. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the light diffuser was arranged on the side opposite to the light source unit 10 so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X direction.

(Comparative Example 14)
The light-diffusing body is formed by arranging the concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 so that the respective concavo-convex portions are orthogonal to each other, and the concavo-convex surface and the non-concave surface are overlapped. Got. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the light diffuser was arranged on the light source unit 10 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X direction.

(Comparative Example 15)
The concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, on the opposite side to the light source unit 10, the projections and depressions on the light source unit 10 side have the projections and depressions on the side of the light source unit 10 such that the projections and depressions of the lenticular lens pattern 51 a having the projections and depressions repeat along the Y direction. The light diffuser was arranged so that the tip of the convex part of the concave / convex pattern 22a repeated along the direction was directed.

(Comparative Example 16)
The concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped to form each concavo-convex pattern forming sheet. A light diffusing body was obtained with the tips of the convex portions facing opposite sides. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the convex end of the lenticular lens pattern 51a in which irregularities are repeated along the Y direction is directed to the side opposite to the light source unit 10, and the irregularities are directed to the light source unit 10 side in the X direction. The light diffusing body was arranged so that the tips of the convex portions of the concave / convex pattern 22a repeated along the surface faced.

(Comparative Example 17)
The light-diffusing body is formed by arranging the concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 so that the respective concavo-convex portions are orthogonal to each other, and the concavo-convex surface and the non-concave surface are overlapped. Got. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the light diffuser was arranged on the side opposite to the light source unit 10 so that the tip of the convex portion of the lenticular lens pattern 51a in which irregularities were repeated along the Y direction was directed.

(Comparative Example 18)
The light-diffusing body is formed by arranging the concavo-convex pattern forming sheet obtained in Production Example 1 and the lenticular lens sheet obtained in Production Example 4 so that the respective concavo-convex portions are orthogonal to each other, and the concavo-convex surface and the non-concave surface are overlapped. Got. Next, this light diffuser was attached to the inner peripheral surface of the cylindrical acrylic resin cover of the light source unit A obtained in Production Example 5 to obtain an illumination device. At that time, as shown in Table 3, the light diffuser was arranged on the light source unit 10 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X direction.

(Comparative Example 19)
The uneven | corrugated pattern formation sheet obtained in manufacture example 1 was attached to the internal peripheral surface of the acrylic resin cover with a lenticular lens pattern of optical unit B obtained in manufacture example 6, and the illuminating device was obtained. At that time, the concavo-convex pattern forming sheet and the lenticular lens pattern 51a were arranged so that the respective concavo-convex portions were orthogonal to each other, and the tip of the convex portion of the concavo-convex pattern forming sheet was directed to the light emitting diode side.

(Comparative Example 20)
The uneven | corrugated pattern formation sheet obtained in manufacture example 1 was attached to the internal peripheral surface of the acrylic resin cover with a lenticular lens pattern of optical unit C obtained in manufacture example 7, and the illuminating device was obtained. At that time, the concavo-convex pattern forming sheet and the lenticular lens pattern 51a were arranged so that the respective concavo-convex portions were orthogonal to each other, and the tip of the convex portion of the concavo-convex pattern forming sheet was directed to the light emitting diode side.

(Comparative Example 21)
The uneven | corrugated pattern formation sheet obtained in manufacture example 1 was attached to the internal peripheral surface of the acrylic resin cover with a lenticular lens pattern of optical unit C obtained in manufacture example 7, and the illuminating device was obtained. At that time, the projections and depressions of the projection / depression pattern forming sheet were arranged so that the projections and depressions were orthogonal to each other, and the tip of the projection of the projection / depression pattern forming sheet faced the opposite side to the light emitting diode side.

( Reference Example G )
A lighting device was obtained in the same manner as in Reference Example A , except that the uneven pattern forming sheet on the light source unit 10 side was changed to that obtained in Production Example 2.

( Reference Example H )
A lighting device was obtained in the same manner as in Reference Example A , except that the uneven pattern forming sheet on the light source unit 10 side was changed to that obtained in Production Example 3.

(Comparative Example 22)
A lighting device was obtained in the same manner as in Comparative Example 1 except that the uneven pattern forming sheet on the light source unit 10 side was changed to that obtained in Production Example 2.

(Comparative Example 23)
A lighting device was obtained in the same manner as in Comparative Example 1 except that the uneven pattern forming sheet on the light source unit 10 side was changed to that obtained in Production Example 3.

[Evaluation]
The illuminance and antiglare property of the obtained lighting device were evaluated by the following methods. The evaluation results are shown in Tables 1 to 4.
・ Measurement method of illuminance Arrange the lighting device so that its length direction is parallel, and use the illuminance measurement device (Hioki Denki, Lux High Tester 3423) at 50 cm directly below the center of the length direction of the lighting device. The illuminance was measured.
-Evaluation of anti-glare property The illumination device was visually observed and the glare was evaluated according to the following criteria.
3 points: From a distance of 1 m, it can be seen directly for 5 seconds without feeling dazzling, and no afterimage remains in the eyes.
2 points: From a distance of 1 m, it can be seen directly for 5 seconds, but an afterimage remains in the eyes.
1 point: From a distance of 1 m, it is dazzling and cannot be seen directly for 5 seconds.

The convex part tip of the concave / convex pattern in which the concave / convex pattern repeats along the Y direction is directed toward the light source unit, and the convex part tip of the concave / convex pattern in which the concave / convex pattern repeats along the X direction faces toward the opposite side to the light source unit. The lighting devices of Reference Examples A to F, Example 7, and Reference Examples G to H had sufficient illuminance and sufficient anti-glare properties. In particular, in Reference Examples A , B , E, F, Example 7 and Reference Examples G to H in which the ridges of the concavo-convex pattern meander, since the light can be diffused more efficiently, the ridges of the concavo-convex However, it was possible to obtain an illuminance higher by about 5 to 10% than Reference Examples C 1 and D 2 which are linear and not meandering.
On the other hand, the protrusion tip of the uneven pattern in which the unevenness is repeated along the Y direction is not directed to the light source unit side, or the protrusion tip of the uneven pattern in which the unevenness is repeated along the X direction is the light source unit. In the illumination devices of Comparative Examples 1 to 23 that were not directed to the opposite side, the illuminance was low.

In the above evaluation method for antiglare properties, Reference Examples A and G had the same results. However, when evaluated more strictly, the illumination device of Reference Example G has higher antiglare properties than those of Reference Example A. It was. However, the illuminance was slightly low.
Reference examples A and H were the same in the evaluation method for anti-glare properties. However, when evaluated more strictly, the illumination device of reference example H was slightly less anti-glare than that of reference example A. It was. However, the illuminance was slightly higher.

  The light diffuser used in the present invention is not necessarily suitable for diffusing light emitted from a planar light source in which a plurality of fluorescent tubes are arranged in parallel to each other. This is specifically shown by Reference Examples 1 to 8 below.

(Production Example 8) Production of planar light source A plurality of cold-cathode tubes having a length of 18 cm were arranged in parallel with each other at intervals of 2 cm to produce a planar light source.

(Reference Example 1)
The two concavo-convex pattern forming sheets obtained in Production Example 1 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped with each other so that the convex portion tips of the respective concavo-convex pattern forming sheets are opposite to each other. A light diffusing material facing was obtained. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, unevenness is repeated on the surface light source 80 side along the direction (Y ′ direction) orthogonal to the longitudinal direction (X ′ direction) of the cold cathode tube 81. The light diffuser was arranged on the opposite side to the planar light source 80 so that the convex portion tip of the pattern 21a was directed to the opposite side of the planar light source 80 so that the convex portion tip of the concavo-convex pattern 22a was repeated along the X ′ direction.

(Reference Example 2)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the concavo-convex surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the tip of the convex portion of the concave / convex pattern 21a in which the concave / convex pattern repeats along the Y ′ direction is directed to the planar light source 80 side, and the concave / convex portion is opposite to the planar light source 80. The light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated along the X ′ direction was directed.

(Reference Example 3)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the light emission side of the planar light source 80 obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the light diffuser was arranged on the side opposite to the planar light source 80 so that the convex portion tip of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X ′ direction.

(Reference Example 4)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the light emission side of the planar light source 80 obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the light diffuser was arranged on the surface light source 80 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X ′ direction.

(Reference Example 5)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the concavo-convex surfaces were overlapped to obtain a light diffuser. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the tip of the convex portion of the concave / convex pattern 21a where the concave / convex pattern repeats along the Y ′ direction faces the opposite side to the planar light source 80, and the concave / convex portion on the planar light source 80 side. The light diffuser was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated along the X ′ direction was directed.

(Reference Example 6)
The two concavo-convex pattern forming sheets obtained in Production Example 1 are arranged so that the respective concavo-convex portions are orthogonal to each other, and the surfaces having no concavo-convex are overlapped with each other so that the convex portion tips of the respective concavo-convex pattern forming sheets are opposite to each other. A light diffusing material facing was obtained. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the tip of the projection of the concavo-convex pattern 21a in which the concavo-convex repeats along the Y ′ direction is directed to the opposite side to the planar light source 80, and the concavo-convex is X on the planar light source 80 side. The light diffusing body was arranged so that the tip of the convex portion of the concave / convex pattern 22a repeated along the direction was directed.

(Reference Example 7)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the light diffuser was arranged on the side opposite to the planar light source 80 so that the convex portion tip of the concave / convex pattern 21a in which the concave / convex portions repeated along the Y ′ direction faced.

(Reference Example 8)
The two concavo-convex pattern forming sheets obtained in Production Example 1 were arranged so that the respective concavo-convex portions were orthogonal to each other, and the uneven surface and the non-concave surface were superimposed to obtain a light diffuser. Next, this light diffuser was attached to the light emitting side of the planar light source obtained in Production Example 8 to obtain an illumination device. At that time, as shown in Table 5, the light diffuser was arranged on the surface light source 80 side so that the tip of the convex portion of the concave / convex pattern 22a in which the concave / convex portions are repeated along the X ′ direction.

[Evaluation]
The illuminance of the obtained surface light emitting device was measured in the same manner as the illuminance measurement method of the illuminating device. Table 5 shows the measurement results.
・ Illuminance measurement method The surface light emitting device is horizontally arranged so that light from the surface light source is emitted downward, and the illuminance measuring device (manufactured by Hioki Electric Co., Ltd., Lux Hitester 3423) is located 100 cm directly below the center of the surface light emitting device. ) Was used to measure illuminance.

  As shown in Table 5, the illuminance of Reference Examples 3 and 7 was larger than that of the surface light-emitting devices of Reference Examples 1 and 2 using the light diffuser used in the present invention. In the light diffuser used in Reference Examples 3 and 7, the tip of the convex portion of the concave / convex pattern in which the concave / convex pattern repeats along the Y ′ direction is directed to the side opposite to the light source unit. From these results, it is clear that the light diffuser used in the present invention is not suitable for the surface emitting device.

1, 2, 3, 4, 5, 6 Illumination device 10 Light source unit 11 Light emitting diode light source 12 Support body 20, 30, 40, 50, 60, 70 Light diffuser 21, 51 First uneven pattern forming sheet 21a, 41a , 51a, 71a First concavo-convex pattern 22 Second concavo-convex pattern forming sheet 22a, 41b Second concavo-convex pattern 21b, 51b Convex part 21c, 51c Concave part 41, 71 Concave pattern formation sheet 80 Planar light source 81 Cold cathode tube

Claims (2)

In a lighting device comprising a light source unit in which a plurality of light emitting diode light sources are arranged in a line and a light diffuser,
The light diffuser accommodates the light source unit and is disposed between the light source unit and the cylindrical cover, and the cylindrical cover having the first uneven pattern formed on the inner peripheral surface on the light emitting side of the light source unit. A second concavo-convex pattern forming sheet in which a second concavo-convex pattern is formed on the surface opposite to the light source unit so as to face the first concavo-convex pattern,
The first concavo-convex pattern includes a plurality of light emitting elements in which a convex portion constituting a ridge line of the first concavo-convex pattern and a concave portion between adjacent ridge lines are parallel to the surface of the cylindrical cover. It repeats along a direction in a range of ± 20 ° with respect to the direction orthogonal to the arrangement direction of the diode light source, and the second concavo-convex pattern has a convex portion constituting the ridge line of the second concavo-convex pattern, A recess between adjacent ridge lines is repeated along a direction in a range of ± 20 ° with respect to the arrangement direction of the plurality of light emitting diode light sources,
In the second concavo-convex pattern, the mode pitch A of the concavo-convex pattern is more than 1.0 μm and 30 μm or less, and the ratio of the average depth B of the concavo-convex to the mode pitch A (B / A) is 0.1 to 3.0. There is a lighting device. The lighting device according to claim 1, wherein the first concavo-convex pattern has a lenticular lens shape having a concavo-convex pattern pitch of 1 to 1000 μm.

Images