JPH0562820U - Luminous pointer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a luminescent guide that emits light by itself and exhibits a novel and excellent visual effect. [Structure] On a surface of a linear metal core material 10 having a diameter of 1.5 mm or less, an enamel insulating reflection layer 20, a phosphor light emitting layer 30 in which a phosphor is dispersed in a enamel, a transparent conductive film 40 and a transparent protective layer 50 And a wire-shaped inorganic dispersion-type light emitting element in which the linear metal core material 10 and the transparent conductive film 40 are electrically connected to each other. The electrode on the transparent conductive film 40 side is an auxiliary electrode in which a conductive film having a resistivity lower than that of the transparent conductive film 40 is provided on the base side and / or the longitudinal back side of the pointer so as to be in contact with at least the transparent conductive film 40. Formed from.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting guide that exhibits a novel visual effect, and more specifically to a light emitting guide that is composed of an inorganic dispersion type light emitting device and emits light by itself to exhibit excellent visibility.

[0002]

[Prior Art]

 Generally, the inorganic dispersed light emitting device is widely used for the dial of automobile instrument and the display of show windows, and the conventional inorganic dispersed light emitting device (flat type) has the basic structure as shown in FIG. It has a structure.

That is, the inorganic dispersion type light emitting device (flat type) shown in FIG. 7 has an enamel (glassy) insulating reflection layer 2, a phosphor light emitting layer 3, a transparent conductive film 4 and a transparent protective layer on a metal base 1. It is constituted by sequentially forming the layer 5.

The enamel insulating reflective layer 2 has a high dielectric constant in order to increase the application of an electric field to the phosphor light-emitting layer 3, and a white enamel glaze to exert the function as a reflective layer. Is usually used.

As shown in FIG. 8, the phosphor light emitting layer 3 has a structure in which the phosphor 3b is dispersed in the enamel 3a.

Further, a transparent conductive film 4 is formed on the phosphor light emitting layer 3 by vapor deposition, sputtering, or the like, and the surface of the transparent conductive film 4 is provided for insulation from the outside and protection of the element. Further, a transparent protective layer 5 having a transparent at least the light emitting surface side is formed.

In the above structure, the electrode 4 a provided on the transparent conductive film 4 and the electrode 1 a provided on the metal base 1 are electrically connected by the lead wire 6 and a voltage is applied from the power supply 7. An electric field is generated in the phosphor light emitting layer 3 so that the phosphor 3b emits light.

However, in the conventional inorganic dispersion type light emitting device having the above-mentioned structure, the flat (flat plate) type is predominant, and this is mainly used as a dial for automobile instruments and measuring instruments, for example, at night. It is used to improve visibility.

By the way, in the conventional instrument and measuring instrument for automobiles, it is known to illuminate the dial and the display character portion by using the above-mentioned inorganic dispersion type light emitting element, and the indicator itself of the instrument. Since it does not emit light, the visual recognition effect is poor, and there is a problem that the reading accuracy of the instrument cannot be sufficiently satisfied, especially at night.

[0010]

[Problems to be solved by the device]

 The present invention has been achieved as a result of studies for solving the above-mentioned conventional problems.

Therefore, an object of the present invention is to provide a light emitting guide which emits light itself and exhibits a new and excellent visual effect.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the light emitting pointer of the present invention is a phosphor light emitting layer in which a hollow metal insulating material having a diameter of 1.5 mm or less is provided on a surface of an insulating reflective layer, and a phosphor is dispersed in the hollow material. A transparent conductive film and a transparent protective layer are sequentially formed, and the rod-shaped inorganic dispersion type light emitting element electrically connects the linear metal core material and the transparent conductive film.

[0013]

[Action]

 The light emitting pointer of this invention applies the structure of the inorganic dispersion type light emitting element to the pointer-shaped rod-shaped object, so that it emits light and exhibits a new visual effect, especially at night, and the reading accuracy of the instrument is significantly improved. Can be improved.

Further, the light emitting pointer of the present invention can maintain its brightness and prevent the occurrence of a brightness gradient by devising the electrode forming means, and its light emitting reliability is extremely excellent. It can be

Therefore, the light emitting pointer of the present invention can be widely used as a finger needle of, for example, measuring instruments for automobiles and measuring instruments.

[0016]

【Example】

 Hereinafter, embodiments of the light emitting pointer of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional explanatory view showing a basic structure of a light emitting pointer of the present invention, FIG. 2 is a front explanatory view showing a first embodiment of an electrode lead-out example in the light emitting pointer of the present invention, and FIG. A partially cutaway front view showing a second embodiment of the present invention, FIG. 4 is a sectional view showing a process of forming an auxiliary electrode in the second embodiment, and FIG. 5 is a view showing a process of forming electrode terminals in the second embodiment. Similarly, FIG. 6 is a sectional explanatory view showing an example of forming an enamel wire electrode in the second embodiment.

In FIG. 1, an inorganic dispersion type light emitting device forming a light emitting pointer of the present invention has a enamel insulating reflective layer 20 on the surface of a linear metal core material 10 and a phosphor dispersed in the enamel. It has a basic structure in which a phosphor light emitting layer 30, a transparent conductive film 40, and a transparent protective layer 50 are sequentially formed.

The linear metal core material 10 is made of decarbonized steel or stainless steel and has a diameter of 1. It is made of filaments of 5 mm or less.

When decarbonized steel is used as the linear metal core material 10, it has excellent bondability with the hollow insulating reflection layer 20 described below, but particularly with a diameter of 1.5 mm or less. In the case where low cost and easily available stainless steel is used as the filaments, the surface of the enamel-like insulating reflection layer 20 is subjected to sand plast treatment or nickel treatment prior to the formation thereof. It is desirable to improve the adhesion with the insulating reflection layer 20.

The reason why the adhesion between the linear metal core 10 made of stainless steel and the enamel insulating reflective layer 20 is improved by the sand plast treatment or nickel treatment is not clear, but it is probably It is considered that the contained nickel atoms diffuse into the vitreous enamel at the interface with the hollow insulating reflection layer 20 and form some chemical bond.

As the enamel insulating reflection layer 20, a white enamel glaze having a high dielectric constant for increasing the application of an electric field to the phosphor light emitting layer 30 and exhibiting an action as a reflection layer is preferably used. Be done.

Generally, in enamel, the metal and the glass are not directly bonded to each other, but they are often bonded to each other through an oxide film that is always present on the surface. That is, there is a possibility that Si and Fe share an oxygen atom so that they are bound to each other. Therefore, in this case, both are bonded even without the presence of coupling atoms such as Ni. Therefore, in order to bond the stainless steel and the glassy material, first, the dirty layer (oxide layer) on the surface is chemically etched and peeled off, and the clean thin oxide layer is heated again in, for example, an oxygen atmosphere. And then the glass material is fired by a conventional process to obtain a film with good adhesion.

As the phosphor light emitting layer 30, for example, as shown in FIG. 8, a phosphor in which the phosphor 3b is dispersed in the enamel 3a is used.

The transparent conductive film 40 is formed by forming a film typified by an ITO film (indium oxide with tin added) on the phosphor light emitting layer 30 by a method such as vapor deposition or sputtering. ..

As the transparent protective layer 50, a synthetic resin film or a vitreous enamel film having a transparent light emitting surface side is used at least for the purpose of insulation from the outside and protection of the element.

Next, an example of taking out the electrodes in the light emitting pointer of the present invention will be described.

First, in the first embodiment shown in FIG. 2, one electrode 11 is provided on the linear metal core material 10, and the other electrode 61 is wound around the transparent conductive film 40 with the enamel wire 60. It is composed of electrodes.

It should be noted that the transparent protective layer 50 is not shown in FIG.

In the mode of the first embodiment, the electrode 11 is provided on a part of the linear metal core material 10, and the enamel wire 60 is wound on the transparent conductive film 40 to form the simple electrode 61. It is obtained by connecting the simple electrode 61 and the simple electrode 61 to the power source 70.

Then, in the above configuration, when a voltage is applied from the power source 70, an electric field is generated in the phosphor light emitting layer 30, and the phosphor emits light.

However, although the first embodiment has an advantage that the electrode can be easily formed, the simple electrode 61 is partially formed on the transparent conductive film 40, and moreover, by the point contact by winding the enamel wire 60. Since it is formed, a brightness gradient is generated in the brightness of the phosphor of the phosphor emission layer 30, and further, the transparent conductive film 40 is dielectrically broken down in the formation portion of the simple electrode 61, which causes a problem that the brightness cannot be sufficiently maintained. There are cases.

In view of this, in the second embodiment shown in FIGS. 3 to 6, the above-mentioned problems are solved, the brightness is maintained favorably, and the occurrence of a brightness gradient is effectively prevented (FIGS. 3 to 6). The transparent protective layer 50 is not shown in FIG. 6).

That is, the second embodiment is characterized in that the auxiliary electrode 80 made of a conductive film is provided on the base of the pointer where the light emission is not visible and / or on the back side of the pointer in the longitudinal direction.

In FIG. 2, the viewer cannot see the light emitted from the back side of the pointer, and the base 10 'side of the linear metal core 10 is also covered with the pointer cap 90, so that the emitted light cannot be seen. ..

Therefore, a conductor film having a resistivity lower than that of the transparent conductive film 40 should be in contact with at least the transparent conductive film 40 on the base side and / or the back side (both sides in FIG. 3) in the longitudinal direction of the pointer that becomes the light emission blind spot. When the electrode on the transparent conductive film 40 side is formed by the auxiliary electrode 80 provided in the above, the auxiliary electrode 80 does not hinder the visual recognition of the viewer, and further contributes to the maintenance of the brightness and the prevention of the brightness gradient. Of.

As shown in FIG. 3, if the auxiliary electrode 80 is formed over the entire back side in the longitudinal direction of the pointer, the reduction and loss of the electric field strength on the tip side of the pointer are reduced and the brightness gradient is reduced. Not only can it be effectively eliminated, but the luminous efficiency of the entire pointer can be improved and its reliability can be greatly increased.

The auxiliary electrode 80 made of a conductive film is formed by applying a conductive paste such as copper and silver on the transparent conductive film 40 or the phosphor light emitting layer 30 and drying it, or by using nickel, chrome and tin. It can be easily formed by electroless plating. However, it is important to select a conductive paste or a metal used for electroless plating that has a resistivity sufficiently lower than that of the transparent conductive film 40.

FIG. 4 shows an example of the process of forming the auxiliary electrode 80. When the transparent conductive film 40 is formed by, for example, sputtering, the fixing substrate 91 is closely arranged in the longitudinal direction on the back side of the pointer. This results in a state in which there is a portion where the transparent conductive film 40 is not formed in the longitudinal portion of the back surface of the main body. Therefore, the auxiliary electrode 80 can be easily formed by applying a conductive paste or electroless plating so that this portion is in contact with the transparent conductive film 40.

FIG. 5 shows an example in which an electrode terminal 81 is provided on the auxiliary electrode 80 located near the base of the pointer. If the auxiliary electrode 80 is made of a solderable metal, the electrode terminal 81 can be soldered. It can be easily fixed. Needless to say, the enameled wire or the like can be directly soldered to the auxiliary electrode 80 without providing the electrode terminal 81.

FIG. 6 shows an example in which an electrode is formed by winding an enamel wire 60 around an auxiliary electrode 80 located at the base of the pointer which is not visible from the outside, particularly in the pointer cap. In this example, First, the first auxiliary electrode film 82 is formed on the transparent conductive film 40, the enamel wire 60 is wound on the first auxiliary electrode film 82, and the second auxiliary auxiliary conductive film 83 is further formed on the enamel wire 60. Since the enamel wire 60 is wound on the inner layer, the enamel wire 60 does not damage the transparent conductive film 40 and is connected to the transparent conductive film 40 with a sufficient contact area.

A specific example of manufacturing the light emitting pointer of the present invention having the above structure will be described below.

Preparation of Linear Metal Core Material A stainless linear body having a diameter of 1 mm and a length of 50 to 70 mm was prepared, and this linear body was subjected to sand plast treatment.

Formation of Enameled Insulating Reflective Layer A white enamel glaze slip was applied to the surface of a stainless steel linear body, dried at 100 to 150 ° C. for 30 minutes, and then calcined at 350 to 400 ° C. for 10 minutes. Then, main firing was performed at 750 ° C. for 5 to 10 minutes.

Formation of Phosphor Emitting Layer A phosphor is mixed with a slip of transparent enamel glaze, and this is applied on an enamel insulating reflective layer, and then dried under the same conditions as in the case of the enamel insulating reflective layer, Pre-baking and main baking were performed.

As the phosphor, four kinds of 813 (blue-green), 830 (white), 523 (yellow-green) and 729 (green) manufactured by SYLVANIA (Sylvania) were used, and 70 parts by weight of enamel glaze was used. The phosphor was mixed at a ratio of 30 parts by weight.

Formation of Transparent Conductive Film An ITO film (indium oxide with tin added) was formed by a magnetro sputtering method under the following conditions.

Baking condition: 200 ° C., 1 hour Sputtering time: 10 minutes Atmosphere (Ar) flow rate: 20 CCM Vacuum degree: 9 × 10 ⁻⁶ Toor (Sputtering: about 1 × 10 ⁻³ Toor) The base side and the pointer By fixing the fixing substrate to the portion located in the longitudinal direction on the back side, the pointer was fixed and the auxiliary electrode forming portion was secured.

Formation of Electrode and Transparent Protective Layer An electrode is provided on a part of the metal core material of the base, and a conductive paste is applied to the above-mentioned auxiliary electrode forming portion and dried to form the auxiliary electrode, and then the base of the auxiliary electrode is formed. The electrode terminals were fixed to the side by soldering.

Further, the luminescent guide of this invention was completed by further forming a enamel transparent protective layer on the transparent conductive film.

When an AC electric field was applied between the electrode terminal on the auxiliary electrode and the electrode on the stainless steel linear member with respect to this light emitting pointer, a maximum emission luminance of 50 cd / m ² at 200 V and 400 Hz was obtained. The light emission was extremely uniform from the base of the pointer to the tip.

From these facts, the luminous pointer of the present invention has no gradient of luminous brightness and is excellent in maintaining the brightness, and exhibits novel and excellent visibility when applied as a pointer of an automobile instrument, for example. It was confirmed that the reading accuracy could be improved.

[0053]

[Effect of the device]

 As described above, the light emitting pointer of the present invention applies the structure of the inorganic dispersion type light emitting element to the needle-shaped rod-like object, so that it emits light by itself and exhibits a new visual effect particularly at night. The reading accuracy of the instrument can be significantly improved.

Further, the light emitting pointer of the present invention can maintain its brightness and prevent the occurrence of a brightness gradient by devising the electrode forming means, and its light emitting reliability is excellent. It can be

Therefore, the light emitting pointer of the present invention can be widely used as a finger needle of, for example, measuring instruments and measuring instruments for automobiles.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a basic structure of a light emitting pointer of the present invention.

FIG. 2 is a front explanatory view showing a first embodiment of an electrode extraction example in the light emitting pointer of the present invention.

FIG. 3 is a partially cutaway front view showing a second embodiment of the same example of electrode extraction.

FIG. 4 is a sectional explanatory view showing a process of forming an auxiliary electrode in the second embodiment.

FIG. 5 is a front explanatory view showing a process of forming electrode terminals in the same second embodiment.

FIG. 6 is an explanatory sectional view showing an example of forming an enameled wire electrode in the same manner as the second embodiment.

FIG. 7 is an explanatory cross-sectional view showing a conventional flat inorganic dispersion-type light emitting device.

FIG. 8 is an enlarged cross-sectional view of the enamel insulating reflection layer in FIG.

[Explanation of symbols]

 10 Wire Metal Core Material 11 Electrode 20 Hollow Insulating Reflective Layer 30 Phosphor Emitting Layer 40 Transparent Conductive Film 41 Electrode (First Example) 50 Transparent Protective Layer 60 Enamel Wire 70 Power Supply 80 Auxiliary Electrode (Second Example) 81 Electrode terminal 90 Pointer cap

Claims (8)

[Scope of utility model registration request] 1. A enamel insulating reflective layer, a phosphor light-emitting layer having a phosphor dispersed in a enamel, a transparent conductive film, and a transparent protective layer are sequentially formed on the surface of a linear metal core having a diameter of 1.5 mm or less. In addition, the light emitting pointer comprises a rod-shaped inorganic dispersion type light emitting element in which the linear metal core material and the transparent conductive film are electrically connected. 2. The luminous pointer according to claim 1, wherein the linear metal core material is made of decarbonized steel or stainless steel. 3. The linear metal core material is subjected to a sand plast treatment or a nickel treatment on its surface in advance before forming the enamel type insulating reflection layer.
Alternatively, the luminous pointer according to item 2. 4. The light emitting pointer according to claim 1, 2 or 3, wherein the electrode on the transparent conductive film side is formed by winding an enamel wire on the surface of the transparent conductive film. 5. An electrode on the side of the transparent conductive film is a conductive film having a resistivity lower than that of the transparent conductive film, and
The light emitting pointer according to claim 1, 2 or 3, further comprising an auxiliary electrode provided on the back side in the longitudinal direction so as to be in contact with at least the transparent conductive film. 6. The light emitting pointer according to claim 1, 2, 3 or 5, wherein the auxiliary electrode is formed by applying a conductive paste or electroless plating. 7. The light emitting pointer according to claim 1, 2, 3, 5 or 6, wherein an electrode terminal is fixed to a part of the auxiliary electrode. 8. The light emitting pointer according to claim 1, 2, 3, 5 or 6, wherein an auxiliary electrode is formed on a base portion of the pointer, and an enameled wire is wound on an inner layer of the auxiliary electrode. ..