JP2015133242A - Lighting device and displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device showing the same light intensity distribution as that of a fluorescent lamp at a light emission surface while using LED for its light source and a display device restricting occurrence of illumination unevenness and color phase irregularity at its display surface.SOLUTION: A lighting device 1 comprises a base plate 3 having the first surface 3a and the second surface 3b at an opposite side of the first surface and extending in a longitudinal direction crossing at a right angle with a width direction; a plurality of LED modules 30 practically installed in at least a longitudinal direction at the first surface 3a of the base plate; and a tubular translucent member 2 having an incidence plane 21 to which light emitted from the LED modules 30 and an emitting plane 22 mainly constituted by a curved surface bulged out to the light emitted side and covering the side of the base plate 3 and the first surface 3a. The translucent member 2 has a length in which a length in a direction crossing at a right angle with the first surface 3a of the base plate 3 is 1/2 or less of a length from the first surface 3a in a width direction of the base plate 3.

Description

  The present invention relates to a lighting device and a display device.

  Conventionally, incandescent bulbs and fluorescent lamps are used as light sources in backlights such as lighting signs and liquid crystal displays, and lighting equipment. In recent years, it has become possible to increase the output of LED (Light Emitting Diode), which is a point light source, and it has become possible to obtain the illuminance that can be used for illumination. Therefore, LEDs are various as light sources that can replace incandescent bulbs and fluorescent lamps. It is becoming.

  As a device using this type of LED for illumination, there has been proposed an illumination device that suppresses disturbance of light distribution with a simple configuration (see, for example, Patent Document 1).

  The illumination device described in Patent Document 1 includes a cylindrical hollow tube, a rectangular LED substrate disposed in the hollow tube, and at least a pair of substrate supports attached to the longitudinal end of the LED substrate. The substrate support member is in contact with the inner surface of the hollow tube and supports the LED substrate.

JP2013-69617A

  However, since the illumination device described in Patent Document 1 has directivity for light emitted from the LED, when this illumination device is used for illumination of an object such as an advertisement, it is equivalent to a fluorescent lamp. Since the light intensity distribution cannot be obtained, the object cannot be uniformly illuminated, and it is predicted that uneven illumination, uneven color, and the like occur in the object.

  Therefore, an object of the present invention is to provide an illuminating device having a light intensity distribution comparable to that of a fluorescent lamp on an emission surface while using an LED as a light source.

  Another object of the present invention is to provide a display device that suppresses the occurrence of illumination unevenness and color unevenness on the display surface.

  One embodiment of the present invention includes a substrate having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the width direction, and at least the first surface of the substrate. A plurality of LED light emitting units mounted along the longitudinal direction, an incident surface on which light emitted from the LED light emitting unit is incident, and at least a side of the substrate and the first surface are covered. A translucent member that is mainly composed of a curved surface that bulges to the light exit side, and that has an exit surface that emits light incident on the incident surface to the outside, and the translucent member includes the substrate of the substrate. Provided is a lighting device, wherein a length from the first surface in a direction orthogonal to the first surface is less than ½ of a length in a width direction of the substrate.

  According to another aspect of the present invention, in order to achieve the above object, a box-shaped housing that houses the lighting device and has an opening, and a display unit that is disposed in the opening of the housing. And providing a display device.

  ADVANTAGE OF THE INVENTION According to this invention, while using LED for a light source, the illuminating device which has light intensity distribution equivalent to a fluorescent lamp in a light-projection surface, and a display apparatus using the same can be provided. In addition, it is possible to provide a display device that suppresses the occurrence of illumination unevenness and color unevenness in an object.

FIG. 1 is a top view showing an example of the appearance of the lighting apparatus according to the first embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view showing an example of an LED module. FIG. 4 is a diagram schematically showing the light intensity distribution of light rays emitted from the LED module. FIG. 5 is a schematic diagram showing a part of the light beam emitted from the illumination device. FIG. 6 is a cross-sectional view of a lighting apparatus according to the second embodiment of the present invention. FIG. 7 is a top view of a lighting apparatus according to the third embodiment of the present invention. FIG. 8 is a sectional view showing an example of a display device according to the fourth embodiment of the present invention. FIG. 9 is a cross-sectional view of a translucent member according to a modification. FIGS. 9A and 9B show Modification 1 and Modification 2, respectively. FIG. 10 is a diagram illustrating the light intensity distribution of the light beam emitted from the illumination device according to the first embodiment of the present invention. FIG. 11 is a diagram illustrating a light intensity distribution of a light beam emitted from the illumination device according to Comparative Example 1. FIG. 12 is a diagram illustrating a light intensity distribution of a light beam emitted from the illumination device according to Comparative Example 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about what has the same function, the description is abbreviate | omitted using the same code | symbol.

[First Embodiment]
FIG. 1 is a top view showing an example of the appearance of the lighting apparatus according to the first embodiment of the present invention.
2 is a cross-sectional view taken along line AA in FIG.

  In this lighting device 1, a translucent member 2 having the same cross-sectional shape in the longitudinal direction and an LED module 30 as an example of a plurality of LED light emitting units are mounted on a first surface 3a and a second surface 3b. The substrate 3 disposed along the longitudinal direction of the translucent member 2 inside the translucent member 2 and a pair of lid members 4 that seal both ends of the translucent member 2 in the longitudinal direction. Prepare.

(Translucent member)
The translucent member 2 has, for example, a tubular shape (a shape closed in the circumferential direction), an incident surface 21 on which light emitted from the LED module 30 is incident, the side of the substrate 3, and the first of the substrate 3. A pair of output surfaces 22 that cover the surface 3a and the second surface 3b of the LED module 30 and are mainly composed of a curved surface that bulges from the LED module 30 toward the light output side, and holds the end portions of the substrate 3 in the width direction. And a substrate holder 23. The substrate holding part 23 is formed by, for example, a recess.

  The translucent member 2 is formed from transparent resin, such as PMMA (polymetal acrylate) and polycarbonate, for example. The translucent member 2 may be formed of a transparent material such as glass in addition to the resin.

  The outer shape of the translucent member 2 has a length in the width direction (major axis direction) of the substrate 3 in a direction (minor axis direction) perpendicular to the first surface 3 a and the second surface 3 b of the substrate 3. It has a size of 1.5 to 3 times, or 2 to 2.5 times. The translucent member 2 is integrally formed with the incident surface 21, the exit surface 22, and the substrate holding portion 23 by, for example, extrusion molding.

  In the translucent member 2, a diffusing material having a refractive index different from that of the transparent resin constituting the translucent member 2 is a ratio of 0.01% by mass to 3% by mass with respect to 100% by mass of the transparent resin. You may make it contain. By including a diffusing material in the light-transmitting resin, it becomes possible to uniformly disperse the light emitted from the LED module 30, and in the display unit 100 when the lighting device 1 is applied to the display device 10 described later. In addition, the occurrence of uneven color and uneven light emission can be suppressed. Further, the light emitted from the LED module 30 can be evenly dispersed by subjecting the emitting surface 22 of the translucent member 2 to a texture or blast.

  The incident surface 21 has a concave shape that is recessed in the direction in which the light emitted from the LED module 30 enters. The concave shape is formed in a substantially elliptical shape having a short axis in the direction along the width direction of the substrate 3 and a long axis in a direction perpendicular to the short axis. The incident surface 21 refracts a part of light incident from the LED module 30 (excluding the direction of the optical axis 31) and guides it to the emission surface 22. The incident surface 21 may have a circular curved surface. Further, the incident surface 21 may partially include a flat surface.

  The emission surface 22 is formed in a substantially elliptical shape having a major axis in a direction along the width of the substrate 3 and a minor axis in a direction orthogonal to the major axis. The exit surface 22 diffracts the light incident from the entrance surface 21 to be diffused in the width direction of the substrate 3 and exits.

(Substrate holder)
As described above, the substrate holding portion 23 is formed by the concave portion. The substrate holding unit 23 is in surface contact with the first surface 3 a and the second surface 3 b of the substrate 3 and holds the substrate 3 so that the optical axis 31 of the LED module 30 is positioned at the center of the incident surface 21. The substrate holding unit 23 may hold the substrate 3 by line contact or point contact.

(Cover member)
The lid member 4 includes a cover 41 having an inner peripheral surface that comes into contact with the emission surface 22 of the translucent member 2 and a base 42 that covers both ends of the translucent member 2. The base 42 has a pair of terminals 421 to which power is supplied from the lighting fixture. The terminal 421 supplies power to the LED module 30 via a wiring pattern (not shown) formed on the first surface 3a and the second surface 3b of the substrate 3.

(substrate)
The board | substrate 3 has the base material formed with resin materials, such as a glass epoxy board | substrate, for example, and the wiring pattern formed in the 1st and 2nd surfaces 3a and 3b of a base material. On the first and second surfaces 3a and 3b of the substrate 3, for example, a plurality of LED modules 30 are mounted in a row along the longitudinal direction with a constant interval. The electrode of the LED module 30 is connected to a terminal 421 of the lid member 4 described later by a wiring pattern (not shown). The LED modules 30 may be arranged in a plurality of rows along the longitudinal direction of the substrate 3 on the first and second surfaces 3 a and 3 b of the substrate 3. In addition, one LED module 30 may be mounted on each of the first and second surfaces 3 a and 3 b of the substrate 3.

(LED module)
FIG. 3 is a cross-sectional view of the LED module 30. The LED module 30 includes a blue LED element 300 that is an LED chip that emits blue light, a package 302 having a recess 301 in which the blue LED element 300 is disposed on a bottom surface, and a phosphor 304 that emits yellow light when excited by blue light. And a pair of leads 305 that electrically connect the terminals 421 of the lid member 4 and the electrodes of the blue LED element 300, and White light is emitted by mixing with yellow light.

  As the blue LED element 300, for example, an element formed from a GaN-based compound semiconductor having an emission wavelength region of 450 to 460 nm can be used. As the phosphor 304, a silicate phosphor or a garnet phosphor such as a YAG (Yttrium Aluminum Garnet) phosphor can be used. Note that the LED module 30 may emit other colors than white, and may emit various color lights using, for example, red, green, and blue LED elements. Moreover, it replaces with the LED module 30 as an LED light emission part, and you may mount an LED element directly on the board | substrate 3, and you may seal the LED element with sealing resin.

  FIG. 4 is a diagram schematically showing the light intensity distribution of light rays emitted from the LED module 30. The LED module 30 emits light having a light intensity distribution having the highest light intensity in a direction orthogonal to the first or second surface 3a, 3b. The LED module 30 has a relatively large light intensity (for example, 75% or more of the maximum light intensity) when the emission angle θ (absolute value) with respect to the optical axis 31 is 0 ° to 40 °, and the emission angle θ is 40 °. It has a light intensity distribution with a relatively small light intensity at ˜90 °. Light rays having a relatively high light intensity may be 70%, 65%, or 60% or more of the maximum light intensity when the emission angle θ is 0 ° to 40 °. The light intensity having a relatively high light intensity may be 75% or more of the maximum light intensity at 0 ° to 45 ° or 0 ° to 50 °.

(Operation of lighting device)
Next, operation | movement of the illuminating device 1 is demonstrated. FIG. 5 is a diagram showing an outline of the light beam emitted from the illumination device 1. When power is supplied to the LED module 30 from a power source (not shown) via the terminal 421 and a wiring pattern (not shown), the blue LED element 300 of the LED module 30 emits blue light. The phosphor 304 converts blue light into yellow light. The LED module 30 emits white light by mixing blue light and yellow light.

As shown in FIG. 5, the light beam emitted from the LED module 30 disposed on the first surface 3 a of the substrate 3 is arranged on the upper side (L ₁ ) of the translucent member 2 according to the emission angle θ. The light is emitted to the outside from the obliquely upper side (L ₂ , L ₃ , L ₄ ) and the side.

As shown in FIG. 5, the light beam emitted from the LED module 30 disposed on the second surface 3 b of the substrate 3 is arranged on the lower side (L ₁ ) of the translucent member 2 according to the emission angle θ, The light is emitted to the outside from the obliquely lower side (L ₂ , L ₃ , L ₄ ) and the side.

(Effects of the first embodiment)
According to the present embodiment, the following effects can be obtained.
(1) By making the emission surface 22 of the translucent member 2 substantially elliptical, light having an emission angle θ ₁ (for example, 60 to 100 °) emitted from the LED module 30 is emitted in the width direction of the substrate 3. It can be converted into light having a spread spread angle θ ₂ (for example, 100 to 160 °, where θ ₂ > θ ₁ ) and emitted. Thereby, when the illuminating device 1 is used for the purpose of illuminating an object such as an advertisement, the illuminating device 1 emits light having a light intensity distribution equivalent to that of a fluorescent lamp, so that the object can be illuminated uniformly. it can. Therefore, it is possible to suppress the occurrence of uneven illumination and uneven color in the object.
(2) By making the incident surface 21 a curved surface, the intensity distribution of the light emitted from the illumination device 1 can be adjusted. Therefore, the object can be illuminated more effectively and the generation of illumination unevenness and color unevenness can be further suppressed.
(3) By making the translucent member 2 tubular, the translucent member 2 can be easily manufactured by injection molding.
(4) By providing the caps 42 at both ends of the translucent member 2 that is a tubular member, the conventional fluorescent tube can be easily replaced with the lighting device 1.

[Second Embodiment]
FIG. 6 is a cross-sectional view of a lighting apparatus according to the second embodiment of the present invention. In the first embodiment, light is emitted from the first and second surfaces 3 a and 3 b of the substrate 3, but in the present embodiment, light is emitted from the first surface 3 a of the substrate 3. It is configured. The following description will focus on differences from the first embodiment.

  The illuminating device 1 of this Embodiment is provided with the board | substrate 3 with which the LED module 30 was mounted in the 1st surface 3a, and the translucent member 2A which has the curved surface bulged to the 1st surface 3a side.

  The translucent member 2 </ b> A includes an emission surface 22 </ b> A formed from a part of a substantially oval shape that covers at least the first surface 3 a of the substrate 3, and an incident surface formed from a part of a substantially oval shape that covers the LED module 30. 21 and a bottom 24 attached to a holding member (not shown) by bonding or the like.

(Effect of the second embodiment)
According to this Embodiment, the illuminating device 1 can illuminate the target object arrange | positioned at the 1st surface 3a side of the board | substrate 3 efficiently and uniformly.

[Third Embodiment]
FIG. 7 is a cross-sectional view of a lighting apparatus according to the third embodiment of the present invention. Although the lighting device 1 according to the first embodiment has the terminals 421 provided at both ends of the translucent member 2, the lighting device 1 </ b> A according to the present embodiment replaces the terminal 421 with the translucent member 2. One end has a lead wire 423 and a connector 43. The following description will focus on differences from the first embodiment.

  In the lighting device 1A of the present embodiment, one end of the translucent member 2 is formed by a lid member 4a having a base 42 through which the lead wire 423 passes and a connector 43 provided at an end of the lead wire 441. It is sealed. The other end of the translucent member 2 is sealed with a lid member 4b.

  The connector 43 is connected to a power supply device (not shown) and supplies power to the LED module 30 via the lead wire 411.

[Fourth Embodiment]
FIG. 8 is a sectional view showing an example of a display device according to the fourth embodiment of the present invention. In the present embodiment, a display device 10 in which the illumination device 1 according to the first embodiment is arranged will be described.

  The display device 10 according to the present embodiment includes a box-shaped housing 11 having openings 11a on both sides, a pair of display units 100 provided in the openings 11a, and the longitudinal direction of the display device 10 (the paper surface of FIG. 8). And a plurality of (this embodiment) that illuminates the pair of display units 100 from the inside of the pair of display units 100. The support unit 12 extends in the direction) and is fixed to the side plate 11 b of the display device 10. 2) in the form. The number of lighting devices 1 used in the display device 10 may be one or three or more.

  The housing 11 is made of a resin material such as metal or polycarbonate, and includes four side plates 11b surrounding the openings 11a on both sides. A metal sheet such as an aluminum sheet is attached to the inner surface of the side plate 11b to enhance the light reflection efficiency. In addition, the inner surface of the side plate 11b may be white-coated instead of the metal sheet. Moreover, you may form the housing | casing 11 with a white resin material.

  The display unit 100 is formed by stacking a display plate 100a, a transparent plate 100b, and a scattering plate 100c. Advertisements and the like are printed on the surface of the display board 100a. The transparent plate 100b and the scattering plate 100c are made of, for example, a transparent resin or transparent glass. The transparent plate 100b protects the display plate 100a. The scattering plate 100c has fine irregularities on the front surface or the back surface, and scatters incident light.

(Operation of display device)
Next, the operation of the display device 10 will be described. When electric power is supplied to each lighting device 1 from a power source (not shown), light is emitted from the plurality of LED modules 30 of each lighting device 1. Light rays L _{11 to} L ₁₃ emitted from the LED module 30 are diffused upward and obliquely upward by the translucent member 2 and emitted from the illumination device 1. The light beam L ₁₁ emitted upward from the illumination device 1 and the light beams L ₁₂ and L ₁₃ emitted obliquely upward from the illumination device 1 reach the display unit 100 to illuminate the display unit 100.

(Effect of the fourth embodiment)
According to the present embodiment, the display unit 100 can be illuminated uniformly by illuminating the display unit 100 with the illumination device 1 that emits light having a light intensity distribution similar to a fluorescent lamp. Moreover, generation | occurrence | production of the illumination nonuniformity and color nonuniformity resulting from the difference in the light intensity between the LED modules 30 of the illuminating device 1, arrangement | positioning, etc. can also be suppressed. In the fourth embodiment, the case where the lighting device according to the first embodiment is applied to the display device 10 has been described. However, the lighting device 1 according to another embodiment may be applied to the display device 10. Good.

[Modification]
FIG. 9 is a cross-sectional view of a translucent member according to a modification. FIGS. 9A and 9B show Modification 1 and Modification 2, respectively.

  Embodiments of the present invention are not limited to the above-described embodiments, and various modifications and implementations can be made without departing from the scope of the present invention. For example, you may provide a recessed part in the side surface of a translucent member like the translucent member 2B shown to Fig.9 (a). Thereby, the light radiate | emitted to the side surface direction of the translucent member 2B is controllable. Moreover, it is good also considering the side surface of a translucent member as a plane.

  Moreover, the shape of the incident surface 21 of the translucent member may be a rectangular shape as in the translucent member 2C illustrated in FIG.

  Moreover, you may comprise the entrance plane 21 of a translucent member by the curved surface formed from several circle | round | yen or an ellipse.

  Moreover, although the illuminating device 1 demonstrated what has the substantially square-shaped LED module 30 seeing from the output side, one or several rectangular-shaped LED extended along the longitudinal direction of the board | substrate 3 seeing from the output side. It may have a module.

  Moreover, the translucent member 2 may have a non-tubular shape, for example, having an opening partially along the longitudinal direction of the substrate 3.

  The lighting device 1 of Example 1 will be described below in comparison with the lighting devices of Comparative Example 1 and Comparative Example 2. FIG. 10 is a diagram illustrating the light intensity distribution of the light beam emitted from the illumination device 1 according to the first embodiment of the present invention, and FIG. 11 illustrates the light intensity of the light beam emitted from the illumination device 1B according to the comparative example 1. FIG. 12 is a diagram showing the light intensity distribution of light rays emitted from the fluorescent tube according to Comparative Example 2. 10 to 12, 0 ° and 180 ° are directions orthogonal to the first surface of the substrate.

  Example 1 corresponds to the first embodiment, and the material of the translucent member 2 is polycarbonate, and the shape of the exit surface is 24.2 mm for the major axis and 17.2 mm for the minor axis. A certain elliptical shape was adopted. In Example 1, the shape of the incident surface of the translucent member 2 was a substantially elliptical shape having a major axis of 13.3 mm and a minor axis of 7.8 mm.

(Comparative Example 1)
The translucent member 2D of the lighting device 1B of Comparative Example 1 is made of polycarbonate and has a cross-sectional shape of a circle having a diameter of 32 mm. Moreover, the shape of the incident surface of this translucent member 2D was made circular. The illuminating device 1B of the comparative example 1 has the same configuration as the illuminating device 1 of the first embodiment except for the shape of the translucent member 2D.

(Comparative Example 2)
In Comparative Example 2, a commonly used fluorescent tube 5 was used. The fluorescent tube 5 has a diameter size of 32.5 mm.

(Evaluation of light intensity distribution)
From the light intensity distributions of FIGS. 10 and 11, the lighting device 1 of Example 1 has a lower light intensity distribution in the upper and lower directions than the lighting device 1B of Comparative Example 1, and is obliquely upward, diagonally downward, and in the lateral direction. It was confirmed that the light intensity distribution was large.

  Here, when the uniformity of the light intensity distribution is obtained by an equation of (minimum value of light intensity distribution / maximum value of light intensity distribution) × 100, the uniformity of Example 1 is about 50%, which is 45% or more of the target. On the other hand, the uniformity of Comparative Example 1 was about 35%. Therefore, it was confirmed that Example 1 has higher uniformity of light intensity distribution than Comparative Example 1, and is close to the light intensity distribution of Comparative Example 2 shown in FIG.

  From the above, Comparative Example 1 using the translucent member 2D having a circular exit surface by making the shape of the exit surface 22 and the entrance surface 21 of the translucent member 2 substantially elliptical as in Example 1. It was confirmed that the light emitted from the LED module 30 can be diffused and emitted obliquely upward, obliquely downward, and in the lateral direction.

  That is, since the illumination device of Example 1 has a light intensity distribution close to the light intensity distribution of the fluorescent tube 5 as in Comparative Example 2, the display unit 100 arranged in the 0 ° and 180 ° directions shown in FIG. The object can be illuminated uniformly.

  The present invention can be used for backlights for liquid crystal displays, lighting devices for signboards such as vertical installation, diagonal installation, horizontal installation, lighting equipment for vending machines, indoor lighting equipment, desk lamps, automobile lamps, street lights, etc. It is.

DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Illuminating device 2, 2A, 2B, 2C, 2D translucent member, 3 ... Board | substrate, 3a ... 1st surface, 3b ... 2nd surface, 4, 4a, 4b ... -Lid member, 5, fluorescent tube, 10 ... display device, 11 ... housing, 11a ... opening, 11b ... side plate, 12 ... support part, 21 ... incident surface, 22, 22A ... emitting surface, 23 ... substrate holder, 24 ... bottom, 30 ... LED module, 31 ... optical axis, 41 ... cover, 42 ... base, 43 ... Connector, 100 ... Display unit, 100a ... Display plate, 100b ... Transparent plate, 100c ... Scatter plate, 300 ... LED element, 301 ... Recess, 302 ... Package, 303 ... Sealing resin, 304 ... Phosphor, 305 ... Lead, 421 ... Terminal, 422 ... Li Word _lines, L 1 _~L 4 ··· _light, L 11 _{~L 13} ··· light, theta · · · emission angle, θ _1, θ ₂ ··· divergence angle

Claims (7)

A substrate having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the width direction;
A plurality of LED light emitting units mounted along the longitudinal direction on at least the first surface of the substrate;
It is mainly composed of an incident surface on which light emitted from the LED light emitting unit is incident, and a curved surface that bulges to the light emission side so as to cover at least the side of the substrate and the first surface, A translucent member having an exit surface that emits light incident on the entrance surface to the outside;
The translucent member has a length from the first surface in a direction orthogonal to the first surface of the substrate that is less than ½ of the length in the width direction of the substrate.
Lighting device. A substrate having a first surface and a second surface opposite to the first surface and extending in a longitudinal direction perpendicular to the width direction;
A plurality of LED light emitting units mounted along the longitudinal direction on the first surface and the second surface of the substrate;
It is mainly composed of an incident surface on which light emitted from the LED light emitting unit is incident, and a curved surface that bulges to the light emission side so as to cover at least the side of the substrate and the first surface, A translucent member having an exit surface that emits light incident on the entrance surface to the outside;
The translucent member has a length from the first surface in a direction orthogonal to the first surface of the substrate that is less than ½ of the length in the width direction of the substrate.
Lighting device. The incident surface is composed of a part or all of a substantially elliptical shape having a major axis in a direction perpendicular to the width direction of the substrate and a minor axis in a direction perpendicular to the major axis,
The emission surface is configured by a part or all of a substantially elliptical shape having a major axis in a direction along the width of the substrate and a minor axis in a direction orthogonal to the major axis.
The lighting device according to claim 2. The LED light emitting unit emits light having a light intensity distribution having the largest light intensity in a direction orthogonal to the first surface of the substrate,
The translucent member diffuses and emits the light having the light intensity distribution so as to have a predetermined light intensity distribution,
The lighting device according to claim 1, further comprising: The translucent member has a tubular shape having the same cross section in the longitudinal direction.
The illuminating device of any one of Claim 1 to 4. The translucent member contains 0.01% by mass to 3% by mass of a light diffusing material with respect to 100% by mass of the translucent resin.
The lighting device according to any one of claims 1 to 5. The lighting device according to any one of claims 1 to 6,
A box-shaped housing that houses the lighting device and has an opening;
A display unit disposed in each of the openings of the housing;
A display device comprising:

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