JPH05205509A - Lighting shade, lighting system and manufacture of shade - Google Patents

Abstract

(57) [Abstract] [Purpose] To easily and inexpensively realize a lighting device that projects a spot pattern onto a wall surface in a room. [Summary] The shade 21 of the lighting device 1 is made of a relatively thick pottery-less pottery, and has a large number of light projecting holes 25 formed therein. The area where the light projecting hole 25 is not formed has a cloud-like pattern, for example. The plurality of light projecting holes 25 have a hole directionality or a light source directionality toward the light source 12 installed inside. Light source 12
The light from passes through the light projecting hole 25 and projects a pattern on the wall surface in the room.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device having a shade made of porcelain and a method for manufacturing the same, and more particularly to a structure for projecting light in the shade.

[0002]

2. Description of the Related Art Conventionally, in addition to a stone lantern, a paper lantern, etc., which have an illumination function and which can be enjoyed emotionally by elaborating on the shade of light emitted from it,
There is a lighting device in which a metal shade is arranged around a light source such as a candle or a light.

In such an illuminating device, it is also possible to enjoy drawing a pattern on the side surface of the shade by the light passing portion and the light blocking portion, and corresponding to the pattern, the light from the light source projects the pattern on the wall surface. it can.

[0004]

However, in a lighting device using a metal shade, since the shade is made of a thin material, the light from the light source diverges, and the pattern drawn on the shade. There is a problem in that it cannot be faithfully displayed on the wall surface. In addition, the metal shade has a problem that it is discolored over a long period of use and its appearance is apt to deteriorate in quality, and in addition, it is easily deformed by heat generated by a light source.

In order to solve such a problem, the inventor of the present application has proposed that the shade is made of ceramic or porcelain so that the shade has a predetermined wall thickness and is unlikely to be discolored or thermally deformed. It is proposed to form. Here, in order to form a shade having a light projecting hole with a ceramics, it is necessary to open the light projecting hole after firing a prototype of clay such as clay or porcelain clay before firing it. In other words, the perforated prototype needs to have a strength capable of maintaining its shape until the firing is completed. However, when a light projecting hole is punched in a side surface portion of the master mold by punching, which is a commonly used ceramics technique, the strength is remarkably reduced, and the master mold cannot maintain its shape until the firing is completed. There's a problem. In addition, if the prototype has a large wall thickness so that the light passing through the light projecting hole does not diverge, the strength decreases due to the formation of the light projecting hole, and the applied load increases. Therefore, it becomes more difficult to maintain the original shape until the firing is completed. Therefore, it has been impossible to realize a shade made of ceramics having a light projecting hole only by a general ceramics technique.

In view of the above problems, the first problem to be solved by the present invention is to easily and inexpensively realize an illuminating device which projects a spot pattern, and the second problem is a new ceramic art. By adopting the method, it is to realize a shade made of ceramics.

[0007]

In order to solve the above-mentioned problems, the present invention is characterized by a lighting shade made of ceramics and provided with a large number of light projecting holes. For example, it is possible to use a shade made of porcelain which has a density near the inner wall of the light projecting hole that is denser than that of the area where the light projecting hole is not formed. Here, for the density distribution near the inner wall of the light projecting hole, it is preferable to use a shade made of ceramics in which the inner wall surface side has a high density gradient.

In addition, the light leaking from the light projecting hole is not scattered and the pattern formed by the light projecting hole on the side surface of the shade is more faithfully reflected on the wall surface or the like. In the group, the distance between adjacent light projecting holes is formed in a hole pattern narrower than the hole diameter, and the projecting holes are formed substantially toward the light source to be arranged in the shade. It is preferable that the shade includes a large number of light holes. Furthermore, when the thickness of the region where the light projection holes of the shade are formed is set to be substantially constant and within the range of about 1 cm to about 4 cm, or It is preferable to provide a raised portion around the opening edge of the hole because the light leaking from the light projecting hole is not scattered and the effect of going straight is enhanced. Here, it is preferable to provide a raised portion around the opening edge of the light projecting hole for the purpose of suppressing a decrease in strength near the light projecting hole.

In order to manufacture the illuminating shade having such a structure, in the manufacturing method according to the present invention, a first step of molding a prototype for forming a shade with clay,
A second step of forming a light projecting hole by inserting the rotating body of the master into the semi-dry state while rotating the shaft and expanding the insertion hole, and then firing to shade the shade. And a third step of forming.
That is, when forming the light projecting hole, instead of punching the master, the semi-dry master is
It is characterized in that the shaft-like body is inserted while being rotated, and the insertion hole is expanded to form the light projecting hole.

Further, the shade is preferably provided with an opening for inserting a light source for the purpose of arranging the light source therein.

Further, the shade receives heat from the light source,
It is preferable that the shade has an intake hole for the purpose of preventing the shade from being heated. Further, the shade is preferably provided with an exhaust hole, and more preferably provided with an intake hole as well.

In the present invention, the shades made of porcelain are not limited to pottery, porcelain, and unglazed earthenware.
It refers to a material that is plastically molded using a clay material.

[0013]

In the illuminating device according to the present invention, the light emitted from the light source is blocked by the shade made of porcelain, while it is leaking from many light projecting holes formed in the side surface of the illuminating device. As well as being able to project a shadow corresponding to the light projecting hole on a wall surface, it can also be used for decoration. Here, the density near the inner wall of the light projecting hole is made using a ceramic shade that is denser than that of the non-forming region of the light projecting hole, and the density distribution near the inner wall of the light projecting hole is When a ceramic shade having a high density gradient on the inner wall surface side is used, the strength of the light-projecting hole forming region is kept high, so that it is hard to break. When the raised portion is formed, the light projecting hole is reinforced, so that the effect of further maintaining the strength of the shade is enhanced. Since it is made of ceramics, its thickness is thicker than conventional metal shades, etc., and it is difficult for light passing through the light projection hole to be scattered, so when the light projection hole is formed toward the light source. The pattern formed by the area where the light projection hole is formed and the area where the light projection hole is not formed is faithfully displayed on the wall surface or the like. Further, since the shade is made of ceramics, it is unlikely that the shade will be discolored or thermally deformed, and the appearance quality can be kept high for many years.

In manufacturing such a shade made of porcelain, if a light projecting hole is formed in a master having a relatively thick wall by a conventional pottery technique, the master is easily deformed before firing. In the manufacturing method according to the above, with respect to the master before firing, the shaft-shaped body is inserted into the master while being rotated, and the projection hole is formed by expanding the insertion hole, so that the area where the projection hole is formed is formed. The clay was
It is in a state of being pushed away by the inner wall surface side of the light projecting hole.
Therefore, since the strength in the area where the light projecting holes are formed is not impaired, a large number of light projecting holes can be provided. Further, since it is not necessary to consider the strength of the prototype before firing, the thickness of the shade can be set arbitrarily.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[Embodiment 1] FIG. 1 shows a lighting device 1 according to the present embodiment.
FIG. 2 is a perspective view of FIG. 2, and FIG.
A part of the side surface is enlarged.

In these figures, the illuminating device 1 has a pedestal 11, a light source 12 and a shade 21, of which
The pedestal 11 is obtained by cutting the raw wood into slices and then polishing the surface of the raw wood to give a gloss treatment. Therefore, even when the lighting device 1 is placed between Japan, it can be sufficiently viewed as a craft. Further, the pedestal 11 is formed with a through hole 13 penetrating through the upper and lower surfaces in the plate thickness direction in a substantially central portion, and a cord wiring hole 14 penetrating from an intermediate position of the through hole 13 to a side end surface of the pedestal 11. The socket 15 is fixed to the through hole 13 on the upper surface side of the pedestal 11. The cord 16 is pulled out from the socket 15 to the outside of the pedestal 11 through the through hole 13 and the cord wiring hole 14, and the switch 10 is provided at the intermediate position.
Is provided, and the incandescent light bulb that is the light source 12 attached to the socket 15 can be blinked.

On the other hand, the shade 21 is a relatively thick potless bottomless pot made of ceramics. The side surface 21c bulges from the bottom side 21a having the light source insertion hole 22 toward the upper end side 21b having the exhaust hole 24. It also has a tapered shape. In addition, for example, 13 intake holes 2 are provided around the side surface portion 21c on the bottom surface side 21a side of the side surface portion 21c.
3 is formed, and from there to the upper end side 21b,
Hole forming regions 25a in which a large number of circular hole-shaped light projecting holes 25 are formed and the remaining cloud-shaped non-forming regions 25b are alternately formed. As shown by the arrow A, the light projecting hole 25 is formed from the outer surface side 21d of the side surface portion 21c of the shade 21 toward the vicinity of the arrangement position of the light source 12, and penetrates the side surface portion 21c. That is, the large number of light projecting holes 25 have light source directivity. Further, any of the light projecting holes 25
Around the opening edge, a region 25b where the light projecting hole 25 is not formed is formed.
The raised portion 26 that is raised more than the rim is formed in a rim shape. Further, in the formation area 25a of the light projecting holes 25, the adjacent light projecting holes 25 are formed in a dense hole pattern with a separation distance narrower than the hole diameter of the light projecting holes 25. In this example, the shade 21 has a height of about 30 cm, a maximum diameter of the side surface portion 21c of about 24 cm, an outer diameter of the bottom surface side 21a of about 17.5 cm, and an outer diameter of the upper end side 21b of about 5. It is 5 cm, and the thickness of the side surface portion 21c is about 1 cm in any portion. And shade 21
Regarding the size of each hole formed in, the inner diameter of the light source insertion hole 22 is about 14.5 cm, the inner diameter of the intake hole 23 is about 2.5 cm,
The inner diameter of the light projecting hole 25 is about 0.6 cm, and the inner diameter of the exhaust hole 24 is about 3.5 cm. The distance between the light projecting holes 25 is several mm, and the height of the raised portion 26 is about 0.1 cm.

The illuminating device 1 having such a structure is used as follows.

First, the shade 21 is covered so that the light source 12 fixed to the upper surface side of the pedestal 11 is located, for example, substantially in the center of the light source insertion hole 22. The light source 12 may be installed so as to be visible from any of the light projecting holes 25. Shade 21
Is made of ceramics, has an appropriate weight, and has a stable shape, which is sufficient for the shade 21 to stand on its own, so that it does not fall even if it is not fixed. Therefore, since no special fixing means is provided, the shade 21
Since it can be easily attached to and detached from the base 11, it is convenient when the light source 12 needs to be replaced.
With the shade 21 thus positioned, the light source 12 is covered by the shade 21 and the light projecting hole 25 formed in the side surface 21c of the shade 21 is small, so that the light source 12 is exposed from the outer surface side 21d of the shade 21. Since it is hard to see, the lighting device 1 can be appreciated not only for lighting but also as an ornamental craft. In addition to the shape of the entire shade 21, in particular, since the hole pattern can be formed like a dot drawing, the pattern on the surface of the shade can be enjoyed.

When the incandescent lamp as the light source 12 of the illuminating device 1 is turned on from this state, the light emitted from the incandescent lamp leaks from the shade 21 through the light projecting hole 25, and the shade 21 of the shade 21 is placed on the wall surface in the room. The formation pattern of the light projecting holes 25 is projected as a spot pattern,
The pattern pattern drawn on the surface of the side surface portion 21c of the shade 21 by the formation area 25a of the light projecting hole 25 and the non-formation area 25b is reflected as a silhouette on the wall surface or the like. Therefore, the lighting device 1 can be used not only for lighting, but also as a lighting device for enjoying the pattern of light projected on the wall surface in the room. Also,
Since the diameter of the light projecting hole 25 is as small as about 0.6 cm and a large number of light projecting holes 25 are formed, it is as if the light projecting hole 25 is emitting light in a stippling manner, and the shade 21 itself functions as an interior. Also exerts. In addition, the light projecting hole 25 is formed toward the vicinity of the arrangement position of the light source 12, and the thickness of the side surface portion 21c of the shade 21 is substantially uniform as a whole and is relatively thick as about 1 cm. For shade 2
The light leaking from the light projecting hole 25 of No. 1 is difficult to scatter or spread,
Since each of the passing lights spreads radially into the space in a relatively focused state (light-transmitting state), the shadow reflected on the wall surface has few penumbras, and the bright part and the whole part. Since the contrast of the shadow portion is emphasized, the pattern formed on the side surface portion 21c of the shade 21 is clearly reflected on the wall surface in the room, and the magic lamp decoration effect is high. Further, a ridge 26 and a burr (a ridge) are formed on the opening edge of the light projecting hole 25.
Since 27 is formed, it is possible to make the hole narrower than that by the thickness of the side surface portion 21c of the shade 21.
In addition, as will be described later, since the raised portion 26 has the meaning of reinforcing the light projecting hole 25 and the light projecting hole 25 is unlikely to collapse, the maker uses the hole forming region 25a or the non-forming region 25b in the process of forming the shade 21. The pattern you are trying to express can be expressed in a pointillistic manner by increasing the density of holes. Since a large number of light projecting holes 25 are formed toward the light source 12, the straight-ahead light from the light source 12 is efficiently extracted, so that the lighting device 1 can be used as a lighting device even if the light amount of the light source 12 is small. It also has the effect of fully exerting its functions. Further, since the incandescent light bulb that is the light source 12 is also a heating element, the heat is also transmitted to the shade 21, but the air inside the shade 21 warmed by the light source 12 is discharged from the exhaust hole 24 while the air intake hole 23 is discharged. Therefore, the cold air of the outside air does not enter and the shade 21 is not heated.
As the light source 12, other than the incandescent light bulb, for example,
A fluorescent lamp, a candle, an alcohol lamp or the like can be used.

Next, of the manufacturing method of the illuminating device 1 according to the present embodiment, particularly the manufacturing method of the shade 21, FIG.
Will be described. FIG. 3 is a process cross-sectional view showing a process of forming the light projecting hole 25 in the master of the shade 21.

First, clay (porcelain earth or porcelain earth) is used as the material of the shade 21 by the rokuro method.
The master 20 of the shade 21 is molded (first step).

Next, in the second step, after the master 20 is naturally dried to a semi-dried state, the bottom surface of the master 20 is cut to form the light source insertion hole 22, while the side surface portion 21 is formed.
An air intake hole 23 is formed by hollowing out the bottom side 21a of c.
Here, the thickness of the prototype 20, particularly, the thickness of the side surface portion 21c forming the light projecting hole 25 is made substantially uniform. In addition, patterns such as patterns, letters, and arrows are drawn on the surface of the side surface portion 21c of the master 20 according to the purpose of use by hand-drawing, or by using a method such as pattern transfer. Then, along the drawn pattern, the light projecting hole 2
5 is formed. As a method of forming the light projecting hole 25, as shown in FIG. 3, first, a shaft 29 such as wooden round chopsticks is rotated at high speed with an electric drill or the like, and the outer surface of the side surface portion 21c is directed toward the light source 12. Abutment on side 21d and insert hole 28
To form. Then, the shaft-like body 29 is inserted into the inner surface side 21e of the side surface portion 21c while maintaining the state of being rotated at high speed. As a result, the clay forming the prototype 20 is formed into the axial body 29.
Is rotated, the light projection hole 25 is formed. Here, the size of the light projecting hole 25 is the same as that of the shaft-shaped body 2.
Since the size is defined as 9, the light projecting holes 25 having the same hole diameter can be easily formed, resulting in good working efficiency and good finished appearance. Moreover, the light projecting hole 25 is
Instead of punching the side surface portion 21c by punching or the like, the clay is pushed away to the surroundings by the shaft-shaped body 29 rotating at a high speed, so that the clay is pressed into the inner wall surface of the light projecting hole 25, resulting in a dense state. Together with the inner wall surface of the light projecting hole 25, a raised portion 26 in which clay is in a dense state is formed at the opening edge.

FIG. 4 shows the density of the inner wall surface of the light projecting hole 25 and the raised portion 26 using a density distribution chart. In FIG. 4, the inner wall surface of the light projecting hole 25 and the raised portion 26 indicate the light projecting hole 2
5 is denser than the density of the non-forming region 25b of No. 5, and is not a stepwise increase in density, but a density gradient C having a curve from a lower clay density to a higher clay density. After the formation process of 21 and its completion, the light projecting hole 25 is crushed by the weight of the shade 21 itself,
It is difficult for cracks to enter. Therefore, there is no problem even if the hole interval is narrowed to increase the hole density. Further, since the raised portion 26 is formed, the periphery of the opening edge of the light projecting hole 25 is reinforced by a layer in a dense state, so that the light projecting hole 25 is more difficult to be crushed. Therefore, even after the light projecting hole 25 is formed, the strength in the vicinity thereof does not decrease.
The strength of the prototype 20 is high. Therefore, a large number of light projecting holes 25 can be formed densely on the side surface portion 21c of the shade 21. It should be noted that some burrs 2 may be inside the light projecting hole 25.
However, since the light projecting hole 25 is not closed, there is no problem in terms of function.

Then, as a third step, the prototype 20
On the other hand, the shade 21 is formed by performing firing under conditions suitable for the shape and the wall thickness.

As described above, in the manufacturing method according to the present embodiment, the shaft 29 rotating at high speed is directed to the position where the light source 12 is to be placed on the outer surface of the side face 21c with respect to the semi-dried master 20. Since the light projecting hole 25 is formed by inserting from the side 21d to the inner surface side 21e, the light projecting hole 25 is formed so that the clay is pushed away around the shaft-like body 29. Therefore, the inner surface wall of the light projecting hole 25 is formed. The ridges 26 are in a dense clay state and have high strength. Therefore, by forming the light projecting holes 25, the density state of the master 20 becomes rough and the strength is not impaired. Therefore, shade 21
Since there are few restrictions on the shape and the conditions for forming the light projecting holes 25, it is possible to form the ceramic shade 21 including a large number of light projecting holes 25 that are closely arranged.

The shape of the light projecting hole 25 is not limited to a round through hole having a substantially equal diameter, but may be a tapered hole, or may be a long hole, a triangle, or a quadrangle.

[Second Embodiment] In the lighting device of the present invention, the shape of the shade can be changed according to the installation location and application of the lighting device. 2 will be described.

FIG. 5 is a perspective view of an illuminating device according to the second embodiment. Here, parts having the same functions as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the figure, the illuminating device 2 also includes a pedestal 11,
It has a light source 12 and a shade 31, and the shade 31 is
It is made of ceramics and has a spherical shape with an opening on the bottom side 31a. Further, the side surface portion 31c of the shade 31 has a bottom surface side 31a having a light source insertion hole 32 to a top end side 31b.
A large number of light projecting holes 35 are formed, and all of the light projecting holes 35 are formed from the outer surface side of the side surface portion 31c of the shade 31 toward the center of the shade 31, that is, in the vicinity of the light source 12. A raised portion 36 is formed around the opening edge. Further, in the side surface portion 31c of the shade 31, the non-formation area 35b has a plow pattern.

The illuminating device 2 having such a structure also includes the pedestal 11
With the light source 12 fixed on the upper surface side of the
Is used by covering the shade 31 from the upper side so that is positioned in the center. In this usage state, the light projecting holes 35 are formed on the upper and lower sides of the side surface 31c of the shade 31 with respect to the light source 12, so that not only the wall surface in the room but also the ceiling and the floor surface. The pattern is projected. The air inside the shade 31 warmed by the light source 12 escapes from the light projecting hole 35 on the upper end side 31b of the shade 31, while the cool air emits cold air on the bottom surface side 31a.
Since it enters from the inside, the shade 31 does not become hot even if the light source 12 is used for a long time in a lighting state.

The lighting device 2 according to the present embodiment is also the first embodiment.
It is formed by the same manufacturing method as the lighting device 1 according to the present invention.

First, as a first step, a prototype having a spherical shape with an open bottom surface 31a is molded using clay.

Next, in the semi-dried state of the prototype formed in the first step, a pattern is drawn on the surface of the side surface portion 31c of the prototype, and the light projecting hole is formed so that the pattern part becomes the non-formed area 35b. The second step of forming 35 is performed. Here, the light projecting hole 35 is formed by rotating the shaft 29 at a high speed with an electric drill or the like and inserting it from the outer surface side of the side surface portion 31c toward the light source 12 as in the first embodiment.

Next, as the third step, firing is performed to form the shade 31.

As described above, also in the method of manufacturing the illuminating device 2 of the present example, in the same manner as in the method of manufacturing the illuminating device 1 according to the first embodiment, when forming the shade 31, the prototype of the shade 31 is semi-dried. In this state, the shaft-shaped body is inserted into the side surface portion 31c while being rotated, and the insertion hole is widened to form the light projecting hole 35. For this reason, since the strength of the prototype of the shade 31 is small even if the light projecting hole 35 is formed, its shape does not collapse before the firing is completed. Therefore, a large number of light projecting holes 35 can be formed densely on the side surface portion 31c of the shade 31.

[Third Embodiment] A third embodiment will be described in which a fluorescent lamp is used as a light source of an illumination device.

FIG. 6A is a cut front view of the lighting device 3 according to the third embodiment, and FIG. 5B is a cut side view thereof. Here, parts having the same functions as those in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the figure, the illuminating device 3 also includes a pedestal 11,
It has a light source 12 and a shade 41, and the shade 41 is
It is made of ceramics and has a semi-cylindrical shape with an opening on the bottom side 41a. A large number of light projecting holes 45 are formed in the upper end portion 41b of the shade 41.
Is also formed from the outer surface side of the upper end 41c of the shade 41 toward the center of the shade 41, that is, in the vicinity of the light source 12, and a raised portion 46 is formed around the opening edge.

The illuminating device 3 having such a structure also has the pedestal 11
With the light source 12 fixed on the upper surface side of the
Is used by covering the shade 41 from the upper side so that is positioned in the center. In this usage state, since the light projecting hole 45 is formed at the upper end portion 41b of the shade 41 toward the light source 12, the pattern is projected on the wall surface in the room.

The illuminating device 3 according to the present embodiment is also the first embodiment.
And it is formed by the same manufacturing method as the lighting device according to the second embodiment.

In the first to third embodiments, the illuminating device that illuminates a relatively wide area such as a wall surface has been described.
For example, it goes without saying that an illumination device that is placed on the bedside may be a lighting device that illuminates a narrow range such as a downward direction (floor surface) by arranging a light source relatively above.

As described above, in the lighting device according to any of the examples, since the shade made of ceramics is used, it is hard to be deteriorated and has excellent durability. Moreover, since the thickness is thick, it is difficult for light leaking from the light projecting hole of the shade to be scattered. Especially, when the light projecting hole is formed toward the light source, the light projecting hole forming region of the shade is formed. Since the pattern constituted by the non-formation area is clearly projected on the wall surface in the room, this lighting device can provide an atmosphere that cannot be obtained by the conventional lighting device. In addition, in the manufacturing method, since the light projecting hole is formed by a method in which the strength of the prototype is less likely to decrease, the shape of the shade and the pattern using the light projecting hole may be used depending on the installation location and application of the lighting device. Can be formed. Note that there is no limitation on the place where the lighting device is installed, and it can be used not only indoors but also outdoors by providing the light source side with a water resistant structure. Further, when a candle is used as a light source for an illumination device such as a dew path of a tea room, the shade prevents the candle from disappearing. Also, by changing the shape and design of the shade, its decorativeness is diverse, and it can be installed anywhere. For example, in addition to normal indoor lighting, it can be used for indoor night illumination lights, gate lights, bathroom lights, night sign lights, guide arrow lights, name tag lights, etc., spherical, cylindrical, triangular tubular,
It is possible to adopt a square tube shape, a conical shape, a triangular pyramid shape, a quadrangular pyramid shape, a plate shape, a plate wave shape, or the like.

In the first step of forming the shade prototype in the method for manufacturing the lighting device, the casting mold and the mold raising method may be used in addition to the rokuro production method to mold the prototype. Of course good things. The wall thickness of the side surface of the shade can be arbitrarily set in consideration of the purpose of use and the overall size, but is preferably 1 cm to 4 cm. If the wall thickness is thin, it is difficult to maintain the strength of the shade, and a substantial light projecting hole cannot be formed. If it is too thick, the weight of the shade becomes too heavy, and the strength of the shade cannot be maintained in the process of forming the light projecting hole. However, a thicker one is preferable. This is because the light projecting function is more exerted. It is possible to make a product with a thickness of ten and a few cm. Then, in the second step of forming the light projecting hole, the size of the light projecting hole is 0.3 cm to 4 cm in diameter.
And the interval for forming the light projecting holes is 0.3 cm or more. In addition, the state of the light projecting holes may be the same on both the inner surface side and the outer surface side of the side surface portion, but in the use mode, the pattern projected on the wall surface is colored to enhance the effect of projection. When the inner wall surface of the hole is to be colored glaze, it is desirable that the hole diameter on the outer surface side be slightly larger than the hole diameter on the inner surface side. The number of light sources used is not limited to one, and a plurality of light sources may be used. A plurality of light sources of different colors may be used, or the points may be selectively reduced.
For example, in the case of two light sources, a light projecting hole group directed to one light source and a light projecting hole group directed to the other light source may be formed.

[0046]

As described above, the lighting device according to the present invention is characterized in that it has a shade made of ceramics having a large number of light projecting holes. Therefore, according to the present invention, the light emitted from the light source can be leaked from the light projecting hole and a shadow corresponding to the light projecting hole can be projected on the wall surface or the like, so that it can be also used for decoration. ..

Here, the density distribution near the inner wall of the light projecting hole is made by using a ceramic shade in which the density near the inner wall of the light projecting hole is denser than that of the area where the light projecting hole is not formed. When a shade made of porcelain which has a high density gradient on the inner wall surface side is used, the strength of the light-projecting hole forming region is kept high, and thus is hard to break. Therefore, a dense hole pattern may be formed, but it is possible to relatively freely create a dot-like hole-making pattern in the shade. When the raised portion is formed, the light projecting hole is reinforced, so that the effect of further maintaining the strength of the shade is enhanced. Since it is made of ceramics, its thickness is thick, so the light passing through the light projecting hole is less likely to scatter, and especially when the light projecting hole is formed toward the light source, the area where the light projecting hole is formed. And the pattern constituted by the non-formed area is faithfully displayed on the wall surface or the like. Further, since the shade is made of ceramics, it is unlikely that the shade will be discolored or thermally deformed, and the appearance quality can be kept high for many years.

In the method for manufacturing a lighting device according to the present invention, in a state where the prototype of the shade is semi-dried, the shaft-like body is inserted into the side surface while rotating, and the projection hole is opened while expanding the insertion hole. It is characterized by forming. Therefore, according to the present invention, since the clay in the portion where the light projecting hole is formed is pushed away to the inner wall surface of the light projecting hole and the periphery of the opening edge, the clay density in that part becomes dense and the light projecting hole and the light projecting hole are formed. The intensity of the light hole formation region is increased. Therefore, even if a large number of light projecting holes are formed, the strength of the prototype of the shade is maintained and the shape does not collapse before the firing is completed. Further, since there are few restrictions on the shape of the shade and the formation of the light projecting holes, a large number of light projecting holes can be densely formed, and a shade having an arbitrary structure can be manufactured.

When the exhaust hole or the intake hole is formed in the shade, the light source inside the shade has the effect of promoting the ventilation of the warmed air, so that the shade does not become hot.

Furthermore, when the light source insertion hole is formed in the shade, it is easy to replace the light source and clean the shade, which is convenient.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of the lighting device.

FIG. 3 is a process vertical sectional view showing a hole forming process in the method for manufacturing the same illumination device.

FIG. 4 is a density distribution diagram in the vicinity of a light projecting hole in the shade of the device.

FIG. 5 is a perspective view showing an illumination device according to a second embodiment of the present invention.

FIG. 6 (a) is a cut front view showing an illumination device according to a third embodiment of the present invention, and FIG. 6 (b) is a cut side view thereof.

[Explanation of symbols]

 1, 2 ... Illumination device 11 ... Pedestal 12 ... Light source 20 ... Prototype 21, 31, 41 ... Ceramic shade for lighting 22, 32 ... Light source insertion hole 23 ... Intake hole 24 ... Exhaust hole 25, 35, 45 ... Light projecting hole 26, 36, 46 ... Raised portion 28 ... Insert hole 29 ... Shaft

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F21V 3/02 Z 2113-3K

Claims (12)

[Claims] 1. A shade for illumination, which is made of ceramics and has a large number of light projecting holes. 2. The illuminating shade according to claim 1, wherein a density near an inner wall of the light projecting hole is denser than that of a region where the light projecting hole is not formed. 3. The illumination shade according to claim 2, wherein the density distribution near the inner wall of the light projecting hole has a high density gradient on the inner wall side. 4. The lighting device according to claim 2 or 3, wherein the light projecting hole group includes a hole pattern in which a distance between adjacent light projecting holes is narrower than a hole diameter thereof. shade. 5. The light projecting hole group according to claim 1, wherein the light projecting hole group includes a light projecting hole that substantially penetrates through a light source to be arranged in the shade. A shade for lighting, which is characterized by containing a large number. 6. The shade for illumination according to claim 1, wherein a raised portion is provided around an opening edge of the light projecting hole. 7. The wall thickness of the area where the light projecting hole is formed is substantially constant, and the wall thickness ranges from about 1 cm to about 4 cm. A lighting shade characterized by being present. 8. The illuminating shade according to claim 1, wherein the shade has an opening for inserting a light source. 9. The shade for illumination according to claim 1, wherein the shade has one or more intake holes. 10. The shade for illumination according to claim 1, wherein the shade has at least one exhaust hole. 11. An illuminating device comprising the illuminating shade defined in any one of claims 1 to 10. 12. A method of manufacturing an illumination shade as defined in any one of claims 1 to 10, comprising a first step of plastically molding a clay material to form a prototype, and the prototype. In a semi-dried state, and then insert the shaft-shaped body with respect to the original mold while rotating, and expand the insertion hole to form the light projecting hole. A third step of forming a shade, and a method for manufacturing an illumination shade.