JP2000068074A - Dispersion type electroluminescent element and illumination unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination unit without lowering luminance in an illuminating portion, without a light guide body used in various electronic equipment. SOLUTION: This dispersion-type electroluminescent element 20 is formed by sequentially laminating and printing a light transmitting electrode layer 22, made of paste obtained by dispersing light transmitting conductive powder into a flexible light transmitting insulate resin, a light emitting layer 3, a dielectric layer 4 and back electrode layer 5, onto a light transmitting insulating film 21. The electroluminescent element 20 is formed into a shape suiting to a case shape of a product to be illuminated, that is, into a shape provided with projective parts 23A and is loaded as a part of the case member. This can realize an illumination unit 24 without lowering the luminance in the illumination portion and having high illumination efficiency, without requiring a light guide body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed electroluminescent element used for various electronic devices and an illuminating unit using the same.

[0002]

2. Description of the Related Art In recent years, communication equipment, video equipment, audio equipment,
With the diversification of various electronic devices such as watches and the like, those equipped with a backlight for illumination behind a display panel or LCD so that information and items displayed on a display unit can be easily identified and operated even in darkness. Electroluminescent devices (hereinafter, referred to as units for the backlight)
Illumination units using EL elements) are often used.

A conventional EL element and an illuminating unit using the same will be described below with reference to FIGS. 8 and 9. FIG.

FIG. 8 is a sectional view of a conventional EL device.
Is a light-transmitting insulating film such as polyethylene terephthalate, and a light-transmitting electrode layer 2 made of indium tin oxide (hereinafter referred to as ITO) is formed on the lower surface of the insulating film by a vapor deposition method or a sputtering method. Light emitting layer 3 in which zinc sulfide as a base material for light emission is dispersed in a high dielectric resin such as vinylidene fluoride copolymer rubber or cyanoethyl resin, and barium titanate or the like is also dispersed in the high dielectric resin. A dielectric layer 4, a carbon resin-based back electrode layer 5, and an insulating layer 6 are sequentially formed by printing to form a flat EL.
An element 7 is configured.

The thickness of the light-transmitting electrode layer 2 and the thickness of the luminous body layer 3 are very thin with respect to the insulating film 1. However, in the sectional view of FIG. It is shown enlarged.

Next, an illumination unit using the EL element 7 will be described with reference to a sectional view of FIG. 9. The upper part of the EL element 7 is made of a light-transmitting resin or the like and has predetermined display items on the upper surface. The light guide 8 and the LCD 9 are arranged.
An illumination unit 11 is formed by covering these with a case 10.

When a voltage is applied between the light transmitting electrode layer 2 and the back electrode layer 5 of the EL element 7 from a circuit (not shown) of an electronic device, the illumination unit 11 drives the EL element 7 to emit light. The light guide 8 and the LCD 9 are illuminated from below with this light, and even when the surroundings are dark, the display of the light guide 8 protruding from the plurality of holes 10A of the case 10, that is, the display items on the top and the top and the display of the LCD 9 are performed. The displayed contents were clearly visible.

The light-transmitting electrode layer 2 of the EL element 7 is made of ITO formed by vapor deposition or sputtering.
That is, it is made of a hard thin film made of metal powder, is easily broken by bending or breaking, and requires careful handling when assembled into the illumination unit 11. JP-A No. 2000-205, a paste in which a conductive powder having a light transmitting property is dispersed in a flexible light transmitting insulating resin so that an EL element including an insulating film and a light transmitting electrode layer has flexibility. Has proposed a dispersion-type electroluminescent element (hereinafter, referred to as a dispersion-type EL element) constituted by printing and forming a light-transmitting electrode layer by using a light-emitting electrode layer. It has become possible to use a mold EL element or to apply a molding process such as a dome shape to a dispersion EL element.

[0009]

However, in the illumination unit using the conventional EL element 7 or the dispersion type EL element described above, the EL element 7 or the dispersion type EL element is mounted on the inner bottom surface of the case 10 and the light emission unit is provided. Since the upper surface of the illumination unit 11 is illuminated via the light transmissive light guide 8 disposed above, a space for disposing the light guide 8 and its material and assembly costs are required, resulting in high cost. Not only
The light from the EL element 7 or the dispersion-type EL element is absorbed and reflected by the light guide 8 to reduce the amount of light emitted to the outside, and there is a problem that the brightness at the illuminated portion slightly decreases when viewed from the outside.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and when configuring an illuminating unit, does not require a light guide and does not reduce the luminance of an illuminated portion. An object of the present invention is to provide an illuminating unit using the illuminating device.

[0011]

According to the present invention, there is provided a dispersion-type electroluminescent device and an illuminating unit using the same, comprising a light-transmitting insulating film and a light-transmitting conductive powder. Dispersed electroluminescence in which a light-transmitting electrode layer is formed by printing a paste in which a light-transmitting electrode layer is dispersed in a flexible light-transmitting insulating resin, and a light-emitting layer, a dielectric layer, and a back electrode layer are sequentially stacked thereon. The element is formed in a shape conforming to the exterior shape of the target product to be illuminated, and is mounted on the illumination unit so as to be a part of the exterior member.

[0012] Thus, when the illuminating unit is constructed, it is possible to obtain a dispersive type electroluminescent element which does not require a light guide, does not lower the luminance of an illuminated portion, and has excellent illuminating efficiency, and an illuminating unit using the same. it can.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a light-transmitting conductive powder is coated on a whole surface of one surface of a light-transmitting insulating film or at a predetermined position with a flexible light-transmitting conductive powder. After the light-transmitting electrode layer is formed by the paste dispersed in the conductive insulating resin, the light-emitting layer, the dielectric layer, and the back electrode layer are sequentially formed on the light-transmitting electrode layer by printing, the display portion of the target product to be illuminated is formed. It is a dispersion-type electroluminescent element formed into a shape that matches the exterior shape, and each layer including the insulating film and the light-transmitting electrode layer has flexibility, and the dispersion-type electroluminescence element is By processing into a shape such as a concave surface, a convex surface, a three-dimensional curved surface, or the like according to the exterior shape of the illuminated display portion, and mounting so as to be a part of the exterior member of the display portion of the target product,
This has the effect that the display unit can be directly illuminated.

According to a second aspect of the present invention, in the first aspect of the present invention, a notch or a hole is provided around a portion formed into a shape conforming to the outer shape of the display portion of the target product, and the connecting portion is provided. It constitutes a linked movable part,
Through the movable part provided in the part formed in the shape conforming to the exterior shape of the illuminated display part of the target product, it becomes possible to operate other members or electronic components etc. Since the surrounding material is prevented from being pulled by being formed, there is an effect that a three-dimensionally shaped portion can be easily and accurately formed on the movable portion.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the flat dispersion-type electroluminescent element is formed into a predetermined three-dimensional shape by heating and pressing. Yes, by applying heat and pressing to reduce the mechanical stress on the distributed electroluminescent element, the three-dimensional shape of the dispersed electroluminescent element according to the exterior shape of the illuminated display part of the target product It has the effect of being able to be formed in

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, a predetermined three-dimensional shape is obtained by heating and flattening a flat dispersion-type electroluminescent element into a frame. Formed in the
By applying heat and performing suction molding on the frame using the pressure difference of gas, the mechanical stress on the distributed electroluminescent element is reduced, and the dispersed electroluminescent element is used for the illuminated display part of the target product. This has the effect that it can be formed into a three-dimensional shape with high accuracy in accordance with the exterior shape.

According to a fifth aspect of the present invention, there is provided an illumination unit in which the dispersion-type electroluminescent element according to any one of the first to fourth aspects is mounted so as to be a part of an exterior member. In order to use the dispersion type electroluminescent element as a part of the exterior member,
This has the effect that a thin illuminating unit that does not require a light guide can be realized at low cost because the illuminating portion has high illuminating luminance and excellent illuminating efficiency.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, the dispersion type electroluminescent element is mounted along the inner surface of the light transmissive exterior member. Since the dispersive electroluminescent elements are arranged close to the back surface, it is possible to realize an illuminating unit with less decrease in luminance of the illuminated portion,
This has the effect that the dispersion-type electroluminescent element can be reliably protected by the exterior member.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the dispersion-type electroluminescent element is fixed to the exterior member by insert molding. In addition to this, it has the effect of being able to reliably and reliably fix and enhancing the strength of the dispersion-type electroluminescent element.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS. The same components as those described in the section of the related art are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1A is a cross-sectional view of an illuminating unit using a dispersion-type electroluminescent device (hereinafter, referred to as a dispersion-type EL device) according to a first embodiment of the present invention. FIG. 2B is an enlarged cross-sectional view of the dispersion-type EL element. As shown in FIG. 3B, the dispersion-type EL element 20 includes a flexible light-transmitting insulating film 21 such as polyethylene terephthalate and indium oxide. The light transmitting electrode layer 22 is made of a paste in which a light transmitting conductive powder such as tin is dispersed in a flexible light transmitting insulating resin.
A light emitting layer 3 in which zinc sulfide as a base material for light emission is dispersed in a high dielectric resin such as vinylidene fluoride copolymer rubber or cyanoethyl resin, and a barium titanate or the like as the high dielectric resin. Is formed by sequentially printing and forming all of the dielectric layer 4, the carbon resin-based back electrode layer 5, and the insulating layer 6 in which is dispersed. As shown in FIG. 1A, a convex portion 23A having a three-dimensional three-dimensional shape and a concave portion 23B are provided. The illumination unit 24 is mounted on the case 10 such that the LCD 9 is mounted on the concave portion 23B and the position of the LCD 9 is regulated by the side surface 23B1 of the concave portion 23B.

The thickness of each layer of the dispersion-type EL element 20 according to the present embodiment is very thin with respect to the insulating film 21 as in the prior art.
Are enlarged in the thickness direction for easy understanding.

The illuminating unit 24 having the above-described structure is a dispersion type E
When a voltage is applied between the light transmitting electrode layer 22 and the back electrode layer 5 of the L element 20 from a circuit (not shown) of an electronic device, the dispersion type EL element 20 is driven to emit light, and the light of the concave portion 23B is emitted. Is similar to the prior art in that the LCD 9 can be illuminated from below and the displayed contents can be clearly checked even when the surroundings are dark, but the hole 1 of the case 10 that emits light at the same time
Projection 23A of dispersion type EL element 20 protruding from 0A
Since light is emitted at the luminance of the dispersion-type EL element 20, the display, that is, the position of the convex portion 23A can be more clearly recognized without light loss due to other members.

The projection 23A of the dispersion type EL element 20
A predetermined display item may be displayed on the upper surface. In this case, it is needless to say that the display content can be more clearly recognized at the time of light emission than a conventional display item.

As described above, the dispersion type EL according to the present embodiment is
Since the element and the lighting unit using the same are configured such that the projection 23A of the dispersion-type EL element 20 constitutes a protruding portion of the lighting unit 24, that is, a part of the exterior member.
Eliminating the light guide required in the case of the prior art can save space, easily reduce the material and assembly costs, and the illuminance of the illuminated display portion is a distributed type E.
This is the luminance of the L element 20 itself, which eliminates illumination loss.

The dispersed EL element 20 may emit light as a whole, or may emit light only at portions requiring illumination, that is, only at the convex portions 23A and the concave portions 23B. Needless to say, with such a configuration, the current consumption can be reduced, and it is needless to say that the design can be improved if the emitted light is emitted in multiple colors.

(Embodiment 2) FIG. 2A is a top view of an illuminating unit according to a second embodiment of the present invention, and FIG. 2B is a sectional view of the same. As shown in FIG. The dispersion-type EL element 20A mounted on the illumination unit according to the embodiment is different from that according to the first embodiment in that a C-shaped hole 23C1 and a notch are formed around a convex portion 23A serving as a part of an exterior member. Part 23C2 is provided, and the convex part 23A is connected to the connecting part 23.
The convex portion 23A is configured to be rotatable around a fulcrum 23D between the connecting portions 23C3, that is, as a movable portion, and is connected to the outer peripheral portion at C3, and the lower surface of the convex portion 23A is formed. Is provided with a push switch 25 having a knob 25A.

In the illumination unit having the above structure, when a voltage is applied to the dispersion-type EL element 20A, the entire surface emits light and the projections 2
Although the display of 3A, that is, the position and display items and the display content of LCD 9 are clearly visible as in the case of Embodiment 1, in addition to this, when convex portion 23A is pressed downward, FIG. As shown in FIG.
Of the push switch 25 can be depressed, and the push switch 25 can be operated.

When the downward pressing force on the convex portion 23A is removed, the convex portion 23A is pushed up by the return force of the knob 25A of the push switch 25, and the push switch 25 is shown in FIG. It returns to the OFF state.

As described above, according to the present embodiment, by providing holes or notches 23C1 or 23C2 around the convex portion 23A of the dispersion-type EL element 20A which is a part of the exterior member, the convex portion 23A is provided. Can be rotated with a light pressing operation force, and an illuminating unit with a switch having no illuminating loss can be configured with a small number of parts without impairing the operational feeling of the push switch 25.

By providing the hole or notch 23C1 or 23C2, the dispersion type EL element 20 can be formed.
When the convex portion 23A is formed on the movable portion of A, the effect that the three-dimensional shape of the convex portion 23A can be easily formed with high precision can be expected because it is not necessary to pull an extra portion around. is there.

(Embodiment 3) This embodiment describes a processing method for forming a convex portion 23A and a concave portion 23B on the dispersion-type EL element 20 or 20A according to Embodiment 1 or 2. , As shown in FIG.
First, a flat dispersion EL element 20 or 20A to be processed
Is heated to a temperature higher than the thermal deformation temperature of the material of the insulating film 21 and lower than the melting temperature, and positioned on the upper surface of the lower mold 30 having the concave portion 30A at a predetermined position, and subsequently, as shown in FIG. As such, it is heated to the same temperature as the lower mold 30,
By closing the space between the upper mold 31 and the lower mold 30 having the convex portion 31A corresponding to the concave portion 30A of the lower mold 30, the dispersion mold E is closed.
The L element 20 or 20A is processed into a three-dimensional shape along the surface shape of the mold.

At this time, the dispersion type EL element 20 or 20
When A is placed on the heated lower mold 30 for a short time or preheated to the same temperature as the lower mold 30 (upper mold 31), the flexibility of the dispersion-type EL element 20 or 20A is increased. Is improved, so that mechanical stress on the dispersion-type EL element 20 or 20A at the time of press working can be remarkably reduced, so that the processing accuracy is improved and three-dimensional processing is facilitated. Needless to say, the set temperature may be appropriately adjusted and set according to the material of the insulating film 21 of the dispersion-type EL element 20 or 20A or the processed shape thereof.

(Embodiment 4) In this embodiment, a processing method different from the processing method of forming a dispersed EL element in three dimensions according to Embodiment 3 will be described.
As shown in the figure, first, the flat plate-shaped dispersion-type EL element 20 or 20A forming the convex portion 23A and the concave portion 23B is
The frame mold 40 is heated to a temperature higher than the thermal deformation temperature of the material of the insulating film 21 and lower than the melting temperature, and is provided with a concave portion 40A along the processing shape and an air hole 40B communicating from the vicinity of the center of the concave portion 40A to the outside. Position on top,
Subsequently, as shown in FIG.
The air in the recess 40A is evacuated through the
0 or 20A is applied to the recess 40A of the frame 40 by a pressure difference.
Is formed by forming a three-dimensional shape along the surface shape of the frame mold 40 by adsorbing deformation so as to be in close contact with the surface of the frame mold 40.

At this time, the dispersion type EL element 20 or 20
If A is placed on the heated frame mold 40 for a short time or pre-heated and heated to the same temperature as the frame mold 40, the flexibility of the dispersion-type EL element 20 or 20A is improved and processing is performed. In the case of the third embodiment, it is easy to set the temperature of the frame 40 at this time, and the set temperature of the frame 40 may be appropriately adjusted and set depending on the material of the insulating film 21 of the dispersion type EL element 20 or 20A or the processed shape thereof. However, in addition to this, the processing method according to the present embodiment is to form the heated dispersion-type EL element 20 or 20A three-dimensionally by using air pressure. The deterioration of the type EL element 20 or 20A can be reduced.

When the surface on which each layer of the dispersion type EL element 20 or 20A is formed by printing is arranged so as to be on the side opposite to the suction side of the frame mold 40, the dispersion type EL element 20 by suction processing is formed. Alternatively, since the printed layers of 20A are not peeled off, the processability is naturally improved.

Further, in the processing method according to the present embodiment, the air bleeding time at the time of processing can be adjusted by a compressor or the like according to the depth and size of the three-dimensionally shaped portion. It is obtained.

(Embodiment 5) FIG. 5 shows an illuminated button using a dispersion type EL device according to a fifth embodiment of the present invention. As shown in FIG. In the dispersion type EL element 45, predetermined items (not shown) are displayed on the upper surface of the convex portion 45A formed by the method according to the third or fourth embodiment, and the light transmitting electrode layer 22 is formed at the end.
And a power supply terminal 45B having a wiring electrically connected to the back electrode layer 5. The dispersed EL element 45 is mounted so as to cover a required illumination area on the upper surface of the button 46 made of a molding resin or the like. Thus, the illumination button 47 is configured, and the power supply terminal 45B is connected to a circuit (not shown) of the electronic device.
It is connected to the.

The operation of the illuminating button 47 having the above-described configuration is such that when a voltage is applied to the distributed EL element 45 from a circuit (not shown) of the electronic device via the power supply terminal 45B, the illuminating button 4 is operated.
The dispersion-type EL element 45 covering the illumination required portion 7 emits light.

As described above, the illumination button 47 of the present embodiment
Is a simple man-hour that only requires mounting the dispersion type EL element 45 formed in a three-dimensional convex shape on the upper surface of the button 46 above the button 46, and has a high illumination luminance and excellent illumination efficiency. It can be realized at low cost, and the dispersion type EL element 4
The mechanical strength of No. 5 can be reinforced by the button 46.

Further, in the case of manufacturing a keyboard in which a plurality of the illuminating buttons 47 are arranged and arranged, the illuminating portion can be reduced to a minimum necessary portion, so that the power consumption can be reduced and one of the illuminating buttons 47 is used. The corresponding illumination button 47 can be individually converted even when the illumination color of
In an electronic device equipped with this keyboard, a predetermined illuminated button 4 is used for practicing blind touch of the keyboard.
7 can be sequentially emitted.

In the above description, the button 46 is an object product to be illuminated, and the illuminating button 47 in which the dispersion type EL element 45 is mounted so as to cover the button 46, that is, the outer side of the exterior member, has been described as an example. The button may be formed in a hollow state with a light transmitting resin or the like, and a dispersion type EL element formed in a convex shape along the inner surface of the hollow portion may be attached.
Also in this case, since the position of the upper surface of the button can be close to that of the distributed EL element,
It is possible to obtain a device with little light absorption and reflection and high luminous efficiency, and in this configuration, it is possible to surely protect the dispersion type EL device with a button made of a light transmitting resin or the like.

The target product to be illuminated is not limited to the button 46, but can be applied to other members of various electronic devices.
Needless to say, the entire outer peripheral portion may be covered with a dispersion-type EL element like a remote controller shown in FIG.

By illuminating the whole or a part of the exterior of the electronic device in this way, the telephone is lit when the exterior is illuminated when an incoming call is received, the clock is illuminated every predetermined time to inform the time, the rhythm and sound pressure are adjusted. Sound equipment such as a boombox that shines on the outside, a relay remote control, a keyboard instrument such as an electric tone that shines the key to be pressed, a game machine or controller whose housing and buttons shine according to the progress of the game, and when the hot water temperature becomes appropriate It is also possible to realize a household appliance such as a pot whose exterior shines, a fan whose wings shine coolly, an interior such as a wall switch, and a sticker.

(Embodiment 6) FIG. 7 shows an illuminated button using a dispersion type EL device according to a sixth embodiment of the present invention.
8 shows a predetermined item (not shown) on the upper surface of the convex portion 48A formed by the method according to the third or fourth embodiment as shown in FIG. FIG. 7B shows a power supply terminal 48B having a wiring connected to the conductive electrode layer 22 and the back electrode layer 5, and a buried portion 48C projecting downward and having no EL element layer formed thereon. Illuminated button 4 by insert molding with molding resin
9.

The operation of the illumination button 49 is described in the fifth embodiment.
The description is omitted because it is the same as in the case of FIG.

The illuminated button 49 is provided in the embedded portion 48C.
Are buried and integrated with the resin portion 48D during insert molding, so that the adhesion between the dispersion-type EL element 48 and the resin portion 48D can be greatly improved.

[0048]

As described above, according to the present invention, the dispersion-type electroluminescent element is formed into a shape conforming to the outer shape of the illuminated display portion of the target product, that is, a shape such as a concave surface, a convex surface, or a three-dimensional curved surface. By mounting so that it becomes a part of the exterior member, a thin illumination unit with high illumination brightness at the illumination location and no illumination loss can be constructed inexpensively with a small number of parts, and an electronic design with a completely new illumination design configuration The advantageous effect that the device can be realized is obtained.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an illumination unit using a distributed electroluminescent element according to a first embodiment of the present invention. FIG. 1B is an enlarged cross-sectional view of the dispersed electroluminescent element.

2A is a top view of an illumination unit according to a second embodiment of the present invention, FIG. 2B is a cross-sectional view of the illumination unit, and FIG. 2C is a diagram showing a state in which a convex portion of the dispersion type electroluminescent element is pressed.

FIG. 3 (a) is a diagram illustrating a processing method for forming a dispersion type electroluminescent device according to a third embodiment of the present invention. (B) A state diagram in which the mold is closed.

FIG. 4 (a) is a view for explaining a processing method for forming a distributed electroluminescent element according to a fourth embodiment of the present invention. (B) A state in which air in a concave portion of the frame type is evacuated. Diagram shown

FIG. 5 is an external perspective view of an illuminated button according to a fifth embodiment of the present invention.

FIG. 6 is an external perspective view of a remote controller according to another embodiment.

FIG. 7A is an external perspective view of a distributed electroluminescent element mounted on an illuminated button according to a sixth embodiment of the present invention. FIG. 7B is an external perspective view showing the completed state.

FIG. 8 is a sectional view of a conventional electroluminescent element.

FIG. 9 is a sectional view of the illumination unit.

[Explanation of symbols]

 Reference Signs List 3 light emitting layer 4 dielectric layer 5 back electrode layer 6 insulating layer 9 LCD 10 case 10A hole 20, 20A, 45, 48 dispersion type EL element 21 insulating film 22 light transmitting electrode layer 23A, 45A, 48A convex part 23B Concave portion 23B1 Side surface 23C1 hole 23C2 Cutout portion 23C3 Connecting portion 23D Support point 24 Illumination unit 25 Push switch 25A Knob 30 Lower die 30A Lower concave portion 31 Upper die 31A Upper convex portion 40 Frame type 40A Frame type concave portion 40B Air Hole 45B, 48B Power supply terminal 46 Button 47, 49 Illuminated button 48C Embedded part 48D Resin part

Claims (7)

[Claims] 1. A light-transmitting electrode made of a paste in which a light-transmitting conductive powder is dispersed in a flexible light-transmitting insulating resin, on the entire surface of one surface of a light-transmitting insulating film or at a predetermined position. Dispersion-type electroluminescence in which a layer is formed by printing a light-emitting layer, a dielectric layer, and a back electrode layer sequentially thereon, and then formed into a shape that matches the exterior shape of the display unit of the target product to be illuminated. element. 2. The distributed type according to claim 1, wherein a notch or a hole is provided around a portion formed into a shape conforming to the exterior shape of the display portion of the target product, and the movable portion is connected by a connecting portion. Electroluminescent element. 3. The dispersion-type electroluminescent device according to claim 1, wherein the plate-like dispersion-type electroluminescence device is formed into a predetermined three-dimensional shape by heating and pressing. 4. The dispersion-type electroluminescent device according to claim 1, wherein the plate-like dispersion-type electroluminescence device is formed into a predetermined three-dimensional shape by heating and flattening the plate-type dispersion-type electroluminescence device. 5. An illuminating unit in which the dispersion-type electroluminescent element according to claim 1 is mounted so as to be a part of an exterior member. 6. The lighting unit according to claim 5, wherein the dispersion-type electroluminescent element is mounted along the inner surface of the light-transmitting exterior member. 7. The lighting unit according to claim 5, wherein the dispersion-type electroluminescent element is fixed to the exterior member by insert molding.