JP2002313124A - Luminaire and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture easily and at low cost a tube body with a plurality of optical sheets overlapped and provide a luminaire at low price utilizing the above reliable tube body. SOLUTION: A plurality of engaging holes 17 are fitted at longitudinal end parts of a prism sheet 11 and a protective sheet 14 forming a tube body 1. A bolt 41 is provided at the center in width direction of a plate-like receiving part 20 and engaging pins 43 are provided in a position outside the bolt 41. The engaging holes 17 of the longitudinal end parts of the prism sheet 11 and the protective sheet 14 are locked to the engaging pins 43 to keep them in cylindrical shape, and are covered with a presser member 30 and fastened with a bolt 42. Like this, the longitudinal ends of the prism sheet 11 and the protective sheet 14 are pinched by a holding member to constitute the tube body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lighting device and a method for manufacturing the lighting device. More specifically, the present invention relates to a lighting apparatus provided with a tube formed in a substantially cylindrical shape by stacking a plurality of optical sheets, and a method for manufacturing the lighting apparatus.

[0002]

2. Description of the Related Art FIG. 15 is a schematic diagram showing a conventional lighting device. The lighting device includes a tube body 100 that guides light and emits light, and a light source unit 110 provided at one end of the tube body 100. The tube body 100 has a plurality of optical sheets, for example, a prism sheet 101 having a prism surface and emitting light to the outside.
And a reflection sheet 102 for reflecting light in the tube and increasing the amount of emitted light, a diffusion reflection sheet 103 for preventing light diffusion, and a protection sheet 104 for protecting these sheets and maintaining them in a tubular shape. Have been.

[0003] In a tube body 100, a prism sheet 101 is arranged on an outer periphery of a reflection sheet 102, and a protection sheet 104 is arranged on an outer periphery of the prism sheet 101, and a longitudinal end of each sheet is provided between the sheets. At
For example, they are bonded and laminated with a double-sided adhesive tape by a method as disclosed in, for example, JP-A-9-161524. In addition, the protection sheet 104
Further, the joint portion is maintained in a tubular shape from outside by a single-sided adhesive tape.

[0004]

However, in the tube body 100 manufactured by the above method, the adhesive force may decrease with the passage of time, the adhesive portion may be peeled off, and the tube shape may not be maintained.

In addition, it is necessary to bond the lengthwise ends of the sheets without displacement, and it is necessary to round the stacked sheets into a cylindrical shape and stop the ends with an adhesive tape. Therefore, it is extremely difficult to manufacture the tube body 100, and the workability and productivity are extremely poor.
Thus, it was extremely difficult to manufacture a lighting device.

In addition, since the inside of the tube body 100 is heated to a high temperature, the material of each adhesive tape to be used must be excellent in heat resistance and weather resistance. It also caused the production cost to rise.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and makes it possible to easily manufacture a tube body in which a plurality of optical sheets are superimposed, reduce the manufacturing cost, and use the reliable tube body. It is an object to provide an inexpensive lighting device.

[0008]

According to the present invention, there is provided an illuminating device including a tube formed in a cylindrical shape with a plurality of optical sheets laminated, wherein the tube is a tube. The optical sheet is formed into a cylindrical shape by holding means for sandwiching both ends in the length direction of the optical sheet from both sides of the optical sheet.

In the present invention, as the holding means,
A member including a plate-shaped receiving member, a plate-shaped pressing member, and a screw mechanism for sandwiching the optical sheet between the receiving member and the pressing member can be used.

In this case, it is preferable that the stacked optical sheets are held by the holding means so that both end portions in the length direction do not overlap. More preferably, the optical sheets are stacked between the receiving member and the pressing member. Is preferably larger than the thickness of the laminated optical sheets.

Further, at the longitudinal end of the optical sheet,
A holding hole for inserting a screw constituting the screw mechanism is provided,
The screw can be inserted through the holding hole.

In these lighting devices, it is preferable to provide a protection member around the screw.

Alternatively, at the widthwise end of the receiving member,
An engagement means for engaging the longitudinal end of the optical sheet may be provided.

As the engaging means, for example, a means constituted by an engaging hole provided at a longitudinal end of the optical sheet and an engaging pin provided at a widthwise end of the receiving member is used. be able to.

Preferably, a protection member is provided around the engaging pin.

[0016] Further, as the holding means, a holding member provided on both side surfaces with a groove into which a longitudinal end of the optical sheet can be inserted, and a holding member from at least one of an outer surface side and an inner surface side of the holding member. Can be used.

The holding means includes a fixing member for inserting and fixing a longitudinal end of the optical sheet, and a holding member having a groove for allowing the fixing member to be inserted only in the longitudinal direction. It can also be configured.

In these lighting devices, it is preferable that the holding means is provided with an installation screw for providing the installation member for installing the tube body, and a screw constituting a screw mechanism for holding the optical sheet is: It is good to combine with the installation screw.

Further, in the present invention, each optical sheet of a reflection sheet, a prism sheet, a diffuse reflection sheet and a protection sheet is laminated as the tube body, and the prism sheet and the protection sheet are held in a cylindrical shape. It is characterized by.

In the method of manufacturing a lighting device according to the present invention, as a holding means, a holding member provided on both sides with grooves into which the longitudinal ends of the optical sheet can be inserted, and an outer or inner surface of the holding member. A method of manufacturing a lighting device using a member including a holding member provided on the holding material from at least one of the sides, wherein the receiving member is supported by a jig, and one of the optical sheets has a longitudinal direction. After inserting one of the engaging pins into the engaging hole at the end of the second direction, the other one of the engaging pins at the longitudinal end is inserted into the remaining one of the engaging pins, and the optical member is pressed by the pressing member. It is characterized in that the sheet is held in a cylindrical shape.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing a lighting device according to an embodiment of the present invention, FIG. 2 is a partially cutaway sectional view of a tube body 1 constituting the lighting device, and FIG. It is a perspective view. The lighting device includes a tube body 1 formed of a plurality of optical sheets and a light source unit 2 provided at one end of the tube body 1. The illustrated tube body 1 has four optical sheets, that is, a prism sheet 11 having a prism surface and emitting light to the outside.
And a reflection sheet 12 for reflecting light in the tube body 1 to increase the amount of emitted light, a diffusion reflection sheet 13 for preventing light diffusion, and a protection sheet 14 for protecting these sheets and maintaining them in a tubular shape. It is composed of
Each of these sheets is laminated from the inside of the tube body 1 with the diffuse reflection sheet 13, the prism sheet 11, the reflection sheet 12, and the protection sheet 14, and among these, only the prism sheet 11 and the protection sheet 14 are cylindrical. And the tube body 1 is formed. Further, the diffuse reflection sheet 13 and the reflection sheet 12 are provided arbitrarily and do not form an essential configuration in the present invention. Is provided on the upper side of the tube body 1 centering on the joint portion between the prism sheet 11 and the protection sheet 14. The reflection sheet 12 is provided in an area smaller than the diffusion reflection sheet 13.

In the present invention, the tube body 1 is maintained in a cylindrical shape with the two longitudinal ends of the rolled prism sheet 11 and protective sheet 14 sandwiched by holding means. In this embodiment, the holding means includes a receiving member 20 that supports the prism sheet 11 from the inner surface side of the tube body 1 and a pressing member 30 that presses the protection sheet 14 from the outer surface side. The receiving member 20 and the pressing member 30 are each formed substantially in a plate shape, and are provided over the entire length of the tube body 1. The receiving member 20 and the pressing member 30 can sandwich four sheets by a screw mechanism including a bolt 41 and a nut 42.

The receiving member 20 has a flat holding portion 21 for holding each sheet between the holding member 30 and bent portions 22 formed on both sides thereof. As a result, the rounded optical sheet is maintained in a good cylindrical shape without being cut at the side end surface of the holding portion 21.

The receiving member 20 has a longitudinal direction,
The screw holes 23 for inserting the bolts 41 are provided at a plurality of locations (three locations in the illustrated example), and the bolts 41 are inserted from the lower surface of the receiving member 20. The receiving member 20 and the pressing member 30 are made of, for example, a metal material or a heat-resistant plastic material, and are preferably made of a lightweight material such as aluminum or a plastic material.

Further, at both ends of the receiving member 20, holes 24 for inserting the engaging pins 43 are provided outside the screw holes 23 for inserting the bolts 41, respectively. The engagement pin 43 is inserted into the screw hole 24 from the lower surface of the receiving member 20 and, for example, a screw mechanism is used.
Fixed to The engagement pins 43 are for engaging the four optical sheets stacked. Note that the bolt 41 and the engagement pin 43 can be provided integrally with the receiving member 20.

On the other hand, the pressing member 30 has a flat holding portion 31 sandwiched between the receiving member 20 and the optical sheet, and cap portions 32 bulging in a convex shape on both sides thereof. The cap portion 32 covers the engaging pin 43, and has an inner diameter substantially equal to or larger than the outer diameter of the engaging pin 43.

The tube 1 is manufactured as described below, and the optical sheet used for the tube 1 shown in FIG. 3 is used. That is, in the reflection sheet 12 provided at the innermost side of the tube body 1, holes 15 for inserting the bolts 41 are formed at the center in the width direction, and the reflection sheet 12 is positioned at both ends thereof outside the holes 15. Thus, a holding hole 16 through which the engaging pin 43 is inserted is formed. Engagement holes 17 are formed in the prism sheet 11 at both ends in the length direction, through which the engagement pins 43 are inserted and the ends in the length direction of the prism sheet 11 are engaged. In the diffuse reflection sheet 13, holes 15 for inserting bolts 41 are formed at the center in the width direction, and the engaging pins 43 are located at both ends of the diffusion reflection sheet 13 outside the holes 15. A holding hole 17 to be inserted is provided. The width of the diffuse reflection sheet 13 is made longer than the width of the reflection sheet 12. Similarly to the prism sheet 11, the protection sheet 14 is provided with the engagement holes 43 for inserting the engagement pins 43 and engaging the lengthwise ends of the protection sheet 14 with both lengthwise ends. Has been established. The diameters of the holes 15 for inserting the bolts 41, the holes 17 for engagement, and the holes 16 for holding are set in consideration of the amount of expansion and contraction of each sheet.

In manufacturing the tube body 1, a fixing jig is used. As shown in FIG. 4, the fixing jig includes, for example, a square bar-shaped fixing member 50, and the upper end surface thereof is
0 is formed in a shape that can be fitted to the lower surface. In producing the tube body 1, the end surface of the fixing member 50 is fixed to a manufacturing device (not shown) or the like, and the receiving member 20 is fixed to the upper surface of the fixed fixing member 50.

First, the reflection sheet 12 is mounted on the receiving member 20 fixed to the fixing member 50. Next, one of the engagement holes 17 of the prism sheet 11 is fitted into the engagement pin 43, and one end in the longitudinal direction of the prism sheet 11 is engaged with the receiving member 20. Then, the remaining engagement hole 17 at one longitudinal end is fitted into the engagement pin 43, and the prism sheet 11 is held in a cylindrical shape. Then, the diffuse reflection sheet 1
3 is held by the receiving member 20. Then, the protective sheet 1
4 is inserted into the engagement pin 43 and the diffuse reflection sheet 13 is rounded into a cylindrical shape so as to be in close contact with the prism sheet 11, and the other engagement hole 17 is inserted into the engagement pin 43. And is locked to the engaging pin 43. Finally, as shown in FIG. 5, the pressing member 30 is put on the protection sheet 14 and fixed with the nut 42, and
Is prepared.

As described above, the receiving member 20 and the holding member 30
Thus, by sandwiching the longitudinal end of the optical sheet, it is possible to produce a very simple method tube body 1 without previously laminating the optical sheet with an adhesive tape. Further, an adhesive tape having excellent weather resistance becomes unnecessary, and the receiving member 20 and the pressing member 30 which are manufactured at low cost can be used. As a result, workability is improved and manufacturing costs are reduced.

FIG. 6 is a partially broken sectional view of a tube body 1 constituting a lighting device according to another embodiment of the present invention. In the lighting device, an installation member for installation on a ceiling, a side wall of a road, or the like is provided at a tip of a bolt 41 that holds an optical sheet. In the illustrated example, a so-called raceway 60 is provided as the installation member. The raceway 60 is formed by bending a metal plate to have a substantially U-shaped cross section.
And fixing pieces 62 provided at both ends of the fixing piece 61. Fixing piece 61
Is provided with a bolt 41 for insertion. Also,
The lower ends of the setting pieces 62 are bent inward, respectively, and come into contact with the cap 32 of the holding member 30. The raceway 60 is attached by tightening a nut 45 to a bolt 41 inserted into a hole of a fixing piece 61. That is, in the lighting device, the bolt 41 for holding the optical sheet also has the installation bolt 46 for providing the installation member. As a result, the tube body 1 (illumination device) can be easily attached to the raceway 60 (installation member).

FIG. 7 is a partially cutaway sectional view of a tube body 1 constituting a lighting device according to still another embodiment of the present invention. The configuration of the tube body 1 is substantially the same as that of the embodiment shown in FIG. 1. However, in the lighting device, a tubular protection member 44 is provided around the engagement pin 43. The protective member 44 has a smooth surface made of, for example, a plastic material such as fluororesin. The screw mechanism of the engaging pin 43 and the peripheral surface of the engaging hole 17 of the prism sheet 11 and the engaging hole 17 of the protective sheet 14 are formed. Is configured so as not to come into direct contact with the peripheral surface. As a result, it is possible to prevent the engagement hole 17 from breaking and the tube body 1 from being damaged due to thermal expansion, self-weight, and the like of the prism sheet 11 and the protection sheet 14.

In the tube body 1 shown in FIG. 8, when the holding member 30 is tightened by the nut 42,
The distance between the holding member 30 and the receiving member 20 is
The length of the engaging pin 43 is adjusted so as to be larger than the thickness of the optical sheets, and a play is provided between the stacked optical sheets and the holding means. As a result, it is possible to prevent the optical sheet from being damaged or deformed due to expansion and contraction of the optical sheet caused by a change in ambient temperature and a change in temperature due to use.
Generation of abnormal noise caused by movement of the optical sheet due to expansion and contraction can be prevented.

In the lighting device in each of the above-described embodiments described above, the engaging holes 17 are provided at the longitudinal ends of the optical sheets (the prism sheet 11 and the protective sheet 14) forming the tube body 1, and the engaging holes 17 are provided. Hold down member 17 with hole 17
Although the cylindrical shape is maintained by engaging with the engaging pins 43 provided in 0, the engaging pins 43 are not necessarily essential. In the tube body 1 shown in FIG. 9, the longitudinal end of the optical sheet is sandwiched between the pressing member 30 and the receiving member 20 without using the engaging holes 17 and the engaging pins 43. The tube body 1 can be configured with such a simple structure.

In any of the above lighting devices,
The tube body 1 is formed such that both longitudinal ends of the prism sheet 11 and the protection sheet 14 do not overlap. As a result, the tube body 1 can be held in a cylindrical shape with little distortion. Of course, the tube body 1 shown in FIG.
As described above, there is no problem even if both longitudinal ends of the prism sheet 11 are overlapped and engaged with one bolt 41 to be sandwiched.

FIG. 11 is a partially broken sectional view of a tube body 1 constituting a lighting device according to still another embodiment of the present invention. Also in the tube body 1, the tube body 1 is held in a substantially cylindrical shape by holding means for holding the longitudinal ends of the prism sheet 11 and the protection sheet 14. The holding means is made of a holding material 70 having a substantially D-shaped cross section, and provided with a groove 71 on the side surface thereof, into which the longitudinal end of the optical sheet can be inserted. The holding member 70 is made of, for example, a metal material or a heat-resistant plastic material, and is preferably made of a lightweight material such as aluminum or a plastic material in order to reduce the weight. In addition, the holding material 70 includes
Holding member 7 attached from the outer surface side of tube body 1
2 are provided. The holding member 72 includes a groove 71
Any material can be used as long as it can hold the optical sheet inserted into the holding member 70. For example, a screw, a rivet, an adhesive, or the like is used.
Further, the holding member 70 is provided with installation bolts 46 for providing an installation member at a plurality of locations in the longitudinal direction. The installation bolt 46 is provided with a raceway 60 as shown in FIG.

The tube body 1 is composed of the reflection sheet 1
2 and four optical sheets of a prism sheet 11, a diffuse reflection sheet 13 and a protection sheet 14,
In the tube body 1, a reflection sheet 12 and a diffusion reflection sheet 13 are laminated on both ends in the longitudinal direction of the prism sheet 11 and the protection sheet 14, respectively.

In the illuminating device, the longitudinal ends of the four stacked optical sheets are inserted into the grooves 71 and are sandwiched by screws screwed to the holding members 70, so that the tube body 1 is formed. Is formed. The tube body 1 can be formed by such holding means.

FIG. 12 is a partially cutaway sectional view of a tube body 1 constituting a lighting device according to still another embodiment, and FIG. 13 is a perspective view showing a state in which optical sheets constituting the tube body 1 are stacked. FIG. 14 is a side view thereof. In the lighting device, a fixing member 80 that holds the longitudinal ends of the reflection sheet 12 and the diffusion reflection sheet 13 in a stacked state, and a holding member 90 having a substantially rectangular cross section through which the fixing member 80 is inserted are formed. Holding means is configured.
The fixing member 80 includes a rod-shaped pressing portion 81, and the pressing portion 81 is provided with a groove portion 82 into which a longitudinal end of the stacked optical sheets is inserted. Also, the presser 81
Is provided with a tongue portion 83 slightly extending along the optical sheet surface held. This fixing member 80
The optical sheet is provided over the entire length of the optical sheet, but may be partially provided.

In the tube body 1 as well, similarly to the tube body 1 shown in FIG. 11, a reflection sheet 12 and a diffusion reflection sheet 13 are laminated on both longitudinal end sides of the prism sheet 11 and the protection sheet 14, respectively. I have. The laminated optical sheet has its longitudinal end inserted into the groove 82, and is fixed to the fixing member 80 by, for example, bonding, caulking, rivets or screws. In the illustrated example, the optical sheet is fixed by bonding, and in the case of bonding, the adhesive 84 is applied only to the area that comes into contact with the groove 82 and the tongue 83, and the protective sheet 14 and the diffusion sheet are fixed. I have.

The holding member 90 is formed, for example, in the shape of a square bar. The fixing member 80 is inserted through the side surface thereof, and a groove 91 having substantially the same shape as the fixing member 80 is provided. The groove portion 91 is provided with a pressing portion 81 of the fixing member 80.
Can be inserted only from the end face of the holding material 90, and it does not fall off from the side face. The holding member 90 is provided with installation bolts 46 for providing an installation member at a plurality of locations in the longitudinal direction.

In this tube body 1, the optical sheet is maintained in a state of being laminated by the fixing member 80 in advance, so that the longitudinal end of the optical sheet is stable, and the work of mounting the optical sheet on the holding member 90 is extremely difficult. Easy to do. Further, it is not necessary to make the longitudinal ends of the optical sheet exactly coincide with each other, and the workability is improved.

As described above, in the present invention, since the protection sheet 14 and the prism sheet 11 forming the tube body 1 are held in a tubular shape by the holding means for holding the widthwise ends, the adhesive sheet is used in advance. There is no need to bond optical sheets, and workability can be facilitated.

[0044]

According to the lighting device of the present invention, the tube body is formed by holding both ends in the longitudinal direction of the optical sheet forming the tube body in a cylindrical shape by the holding means sandwiching the optical sheet from both sides. Therefore, the tube body can be assembled without previously attaching with a double-sided adhesive tape as in the related art. For this reason, workability is improved in each step, the material cost can be reduced, and the lighting device can be provided at low cost.

Further, since the lengthwise end of the optical sheet is held by a mechanical method, it is possible to stabilize the optical sheet for a long period of time without deterioration of the mating portion due to long-term use.

The holding means may include a plate-shaped receiving member, a plate-shaped pressing member, and a screw mechanism for holding the optical sheet between the receiving member and the pressing member. In this holding means, the optical sheet can be held with a very simple structure.

At this time, by setting the distance between the receiving member and the pressing member to be larger than the thickness of the laminated optical sheets, play can be made between the receiving member and the pressing member, and the surroundings can be freed. It is possible to prevent the optical sheet from being damaged or deformed due to expansion and contraction generated in the optical sheet due to temperature change and temperature change due to use, and to prevent generation of abnormal noise caused by movement of the optical sheet due to expansion and contraction.

Further, a holding hole through which a screw constituting the screw mechanism is inserted is provided at a longitudinal end of the optical sheet, and the screw is inserted through the holding hole.
Engaging means for engaging the longitudinal end of the optical sheet with the lateral end of the receiving member, for example, an engaging hole provided at the longitudinal end of the optical sheet, and the width of the receiving member By providing the engaging pin provided at the end in the direction, the tube body can be formed extremely simply.

In this case, by providing a protective member around the screw and the engaging pin, it is possible to prevent the end face of the hole of the optical sheet through which the screw and the engaging pin are inserted, and to provide a reliable illumination. Equipment can be provided.

Alternatively, a holding member provided on both sides with a groove into which a longitudinal end of the optical sheet can be inserted, and a holding member provided on the holding member from at least one of an outer surface and an inner surface of the holding material. The optical sheet can be held in a cylindrical shape from the member for use.

Further, the optical sheet is formed of a fixing member for inserting and fixing the longitudinal end of the optical sheet and a holding member provided with a groove for allowing the fixing member to be inserted only in the longitudinal direction. It can also be held in a shape.

In the latter case, in particular, since the optical sheets can be manufactured in a laminated state in advance, the tube can be manufactured more easily.

As described above, according to the present invention, it is not necessary to use an adhesive tape for laminating an optical tape or to hold the optical tape in a cylindrical shape, thereby improving workability, reducing manufacturing costs, and using the device for a long time. Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a lighting device according to an embodiment of the present invention.

FIG. 2 is a partially broken sectional view of a tube body constituting the lighting device of the above.

FIG. 3 is an exploded perspective view of the tube body.

FIG. 4 is a schematic explanatory view showing a method for manufacturing the above tube body.

FIG. 5 is a continuation diagram showing a method of manufacturing the above tube body.

FIG. 6 is a partially broken cross-sectional view of a tube body constituting a lighting device according to another embodiment of the above.

FIG. 7 is a partially broken sectional view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 8 is a partially broken sectional view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 9 is a partially broken sectional view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 10 is a perspective view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 11 is a partially broken sectional view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 12 is a partially broken sectional view of a tube body constituting a lighting device according to still another embodiment of the above.

FIG. 13 is a perspective view showing a state where optical sheets constituting the tube body shown in FIG. 12 are stacked.

FIG. 14 is a side view showing a state where the optical sheets shown in FIG. 13 are stacked.

FIG. 15 is a schematic configuration diagram of a conventional illumination device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube body 2 Light source part 11 Prism sheet 12 Reflection sheet 13 Diffuse reflection sheet 14 Protective sheet 15 Bolt insertion hole 16 Engagement pin insertion hole 17 Engagement hole 20 Receiving member 30 Press member 41 Bolt 43 Engagement pin 44 Protective member for engaging pin 46 Installation screw 50 Fixing member 60 Raceway (Installation member) 70 Holding member 71 Groove for inserting optical sheet 72 Holding member 80 Fixing member for fixing longitudinal end of optical sheet 90 Fixing member Holding material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) // F21Y 103: 00 F21Y 103: 00

Claims (15)

[Claims] 1. An illuminating device comprising a tube formed in a cylindrical shape with a plurality of optical sheets laminated, wherein the tube is formed at both ends in the length direction of an optical sheet forming the tube. Characterized by being held in a tubular shape by holding means for sandwiching the optical sheet from both sides of the optical sheet. 2. The apparatus according to claim 1, wherein the holding means includes a plate-shaped receiving member, a plate-shaped pressing member, and a screw mechanism for holding the optical sheet between the receiving member and the pressing member. Item 2. The lighting device according to Item 1. 3. The illuminating device according to claim 2, wherein both lengthwise ends of the stacked optical sheets are held by the holding means without overlapping. 4. The lighting device according to claim 3, wherein a distance between the receiving member and the pressing member is larger than a thickness of the stacked optical sheets. 5. The optical sheet according to claim 2, wherein a holding hole for inserting a screw constituting the screw mechanism is provided at a longitudinal end of the optical sheet, and the screw is inserted into the holding hole. The lighting device according to any one of 3 and 4, 6. The lighting device according to claim 5, wherein a protection member is provided around the screw. 7. The illumination according to claim 2, further comprising an engaging means for engaging a longitudinal end of the optical sheet at a lateral end of the receiving member. apparatus. 8. The method according to claim 1, wherein the engaging means includes an engaging hole provided at a longitudinal end of the optical sheet and an engaging pin provided at a widthwise end of the receiving member. The lighting device according to claim 7, wherein 9. The lighting device according to claim 8, wherein a protection member is provided around the engagement pin. 10. The holding means includes a holding member provided on both sides with a groove into which a lengthwise end of the optical sheet can be inserted, and at least one of an outer surface and an inner surface of the holding material. The lighting device according to claim 1, further comprising a holding member provided in the lighting device. 11. The holding means comprises: a fixing member for inserting and fixing a longitudinal end of the optical sheet; and a holding member having a groove that allows the fixing member to be inserted only in the longitudinal direction. The lighting device according to claim 1, wherein: 12. The lighting device according to claim 1, wherein an installation screw for providing an installation member for installing the tube body is provided on the holding unit. 13. The screw according to claim 2, wherein a screw constituting a screw mechanism for sandwiching the optical sheet is also used as an installation screw for providing an installation member for installing the tube body. The lighting device according to any one of the above. 14. The tube body, wherein each optical sheet of a reflection sheet, a prism sheet, a diffuse reflection sheet, and a protection sheet is laminated, and the prism sheet and the protection sheet are held in a cylindrical shape. Items 1 to 1
The lighting device according to any one of 3. 15. The method of manufacturing a lighting device according to claim 7, wherein the receiving member is supported by a jig, and one of the longitudinal ends of the optical sheet is engaged. After inserting one of the engagement pins into the hole, the other engagement pin at the other longitudinal end is inserted into the other engagement pin, and the optical sheet is held in a tubular shape by the pressing member. A method of manufacturing a lighting device.