JP3401331B2 - Inspection method of alloy mold temperature fuse and alloy mold temperature fuse - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a case type or substrate type alloy type temperature fuse and an alloy type temperature fuse used for the maintenance of electronic or electric equipment.

[0002]

2. Description of the Related Art In an alloy type temperature fuse, a low melting point metal piece to which a flux is attached is used as a fuse element. In this alloy type temperature fuse,
When used by being attached to an electrical device to be protected and when the device heats up due to overcurrent, the generated heat melts and cuts the low melting point metal piece, which prevents abnormal heat generation of the device and even the occurrence of a fire by cutting off the current. ing.

The role of the flux is extremely important in the fusing of the low melting point metal pieces. That is, the already-melted flux removes and cleans the oxide film on the surface of the low melting point metal piece, and further enhances the wettability of the molten metal with respect to the lead wire, thereby making The spheroidizing deformation based on the surface tension is promoted, the molten metal is divided by the progress of the spheroidizing, and the distance between divisions reaches the arc extinction distance due to the further progress of the spheroidizing after the dividing, The disappearance of electric current is surely terminated by the disappearance, and the flux accelerates the cutting of the molten low melting point metal piece, and is therefore an essential component for ensuring the quick operation of the temperature fuse.

Conventionally, a low melting point metal piece is connected between lead wires in an alloy type temperature fuse, a flux is adhered to the low melting point metal piece, and the flux adhering low melting point metal piece is a ceramic case. A case type alloy type temperature fuse, which is covered with a die and is sealed with an epoxy resin material between the opening of the ceramic casing and the lead wire, and a pair of ceramic type fuses on one side of the ceramic substrate. Membrane electrodes are provided, low melting point metal pieces are connected between these membrane electrodes, flux is attached to the low melting point metal pieces, and lead wires are connected to the respective membrane electrodes,
A substrate type alloy type temperature fuse in which an epoxy resin material is coated on one surface of a ceramic substrate is known.

[0005]

Conventionally, it has been known to use an epoxy resin composition containing a filler as a sealing material in a case type alloy type temperature fuse.

By the way, the above-mentioned flux usually contains rosin such as pine resin as a main component, and its color is pale yellow or brown. On the other hand, the epoxy resin is originally colorless, light yellow or amber, but the refraction of light is changed by mixing and reaction with additives such as filler and curing agent, and it is used as an insulator product. The color after curing is
Many are difficult to distinguish from the above fluxes in terms of color.

Thus, in the alloy type temperature fuse, when the inorganic particles are mixed with the epoxy resin, even if the flux is exposed through the epoxy resin sealing portion or the epoxy resin coating layer (such as This condition occurs when the epoxy resin material is used to seal the flux when the flux is attached to the opening of the ceramic case.) If it is used without being extracted, the flux will flow out due to the equipment heat cycle in use, the low melting point metal piece will be oxidized, and the normal operation of the alloy type temperature fuse cannot be guaranteed. There is a fear that poor maintenance will be forced.

An object of the present invention is to easily and surely check a defective product having flux exposed in an epoxy resin sealing portion of a case type alloy type temperature fuse or a substrate type epoxy resin insulating coating layer by visual inspection. Is to be extracted.

[0009]

According to a first aspect of the present invention, as shown in (a) and (b) of FIG. 1 or 2, a low melting point metal piece is connected between lead wires, and the low melting point metal is connected. Flux is attached to the piece, the low melting point metal piece to which the flux is attached is covered with a ceramic case, and an epoxy resin material seals between the opening of the ceramic case and the lead wire. In the temperature fuse, use an epoxy resin composition (excluding a mixture of alumina) in which inorganic particles are blended with the above epoxy resin material and the color after curing is white or gray .
The defective temperature which the flux penetrates through the seal and is exposed.
It is characterized in that the fuse is extracted and removed by visual inspection .

According to a second aspect of the present invention, as shown in (a) and (b) of FIG. 3, a pair of membrane electrodes are provided on one surface of a ceramic substrate, and a low melting point metal piece is connected between these membrane electrodes. Flux is attached to the low melting point metal pieces and reattached to each membrane electrode.
In a temperature fuse in which a lead wire is connected and an epoxy resin material is coated on one surface of a ceramic substrate, an epoxy resin having a white or gray color after curing in which inorganic particles are mixed with the epoxy resin material Composition ( combined with alumina
(Excluding the ones), and the flux penetrates the coating layer.
Removal and elimination of exposed bad temperature fuses by visual inspection
The configuration is characterized in that Claim 3 is shown in FIG.
As shown, on one side of the alumina ceramic substrate,
The membrane electrode of the pattern is printed or printed with a conductive paste.
Is provided between the resistance attachment parts of the membrane electrode.
The body is provided by printing, baking, etc. of the resistance paste.
A low melting point metal piece is connected between the temperature fuse mounting parts of the upper membrane electrode.
Flux is applied to the low melting point metal piece 2 and
Lead wires are connected to both ends of the upper membrane electrode, and
Substrate type resistor with epoxy resin coated on one side of the substrate
・ Curing to the above epoxy resin material at temperature fuse
Epoxy resin composition whose color is white or gray
(Excluding those containing mina), and coated with flux
Defective substrate type resistance / temperature fuse exposed through the layer
The feature is that it is extracted and removed by visual inspection.

In the present invention, the epoxy resin material includes calcium carbonate, aluminum hydroxide, talc, silica,
It is possible to use an epoxy resin composition containing any one of titanium oxides or two or more thereof.

[0012]

[Function] Since the flux is mainly composed of rosin such as pine resin, the color is pale yellow or brown. Even if this flux penetrates and is exposed through the sealing part made of the case type alloy type temperature fuse epoxy resin material and the coating layer made of the board type alloy type temperature fuse epoxy resin material, the epoxy resin For a sufficient color contrast between wood and flux (pale yellow to brown and white to gray)
It can be easily recognized by visual inspection and the defective alloy type temperature fuse can be reliably extracted.

Calcium carbonate, aluminum hydroxide, talc, silica, and titanium oxide have a proven track record of use as fillers or white pigments in epoxy resin insulation, and the insulation can be sufficiently guaranteed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a case type alloy type temperature fuse to which the present invention is directed . In FIG. 1, 1 and 1 are lead wires arranged in a straight line,
Reference numeral 2 is a low melting point metal piece connected between the lead wires 1 and 1 by side contact or welding. 3 is a flux applied to the low-melting metal piece 2, which can be used as a main component of rosin such as pine resin and a small amount of an activator, such as aniline hydrochloride, for use with abietic acid in pine resin. In addition, the color is pale yellow to brown.

Reference numeral 4 denotes a ceramic cylinder (usually talc ceramics, which is white in color) covered on the flux-coated low melting point metal piece. Numerals 5 and 5 are epoxy resin materials that seal between each opening at both ends of the ceramic cylinder and each lead wire (usually a bare copper wire or an insulating coated copper wire is used) and are room temperature curable. Inorganic particles such as calcium carbonate, aluminum hydroxide, talc, silica and titanium oxide are contained, and the color of the cured product is white or gray.

FIG. 2A is a sectional view showing another embodiment of the case type alloy type temperature fuse , which is the subject of claim 1, and FIG. FIG. 2 is a sectional view taken along line (2) -2. In (a) of FIG. 2 and (b) of FIG.
1, 1 are lead wires arranged in parallel with each other, 2 are lead wires 1,
It is a low melting point metal piece connected between 1 by side contact or welding. 3 is a flux applied to the low melting point metal piece 2. As in the above, a flux containing rosin such as pine resin as a main component and a small amount of an activator such as aniline hydrochloride added can be used. The color is pale yellow to brown due to abietic acid.

Reference numeral 4 is a flat ceramics case (usually made of alumina ceramics and white) which is covered with a flux-coated low melting point metal piece and has an opening only at one end. Reference numeral 5 denotes an epoxy resin material that seals between the opening of the ceramic case and the lead wires 1 and 1 (usually a bare copper wire or an insulating coated copper wire is used). It is curable and contains inorganic particles such as calcium carbonate, aluminum hydroxide, talc, silica and titanium oxide, and the color of the cured product is white or gray.

FIG. 3A is an explanatory view showing an embodiment of a substrate type alloy type temperature fuse , which is the subject of claim 2 .
3B is a cross-sectional view taken along the line of FIG. 3A. In FIG. 3A and FIG. 3B, 40 is a ceramic substrate (usually made of alumina ceramic and white). Reference numerals 11 and 11 denote a pair of membrane electrodes provided on one surface of the ceramic substrate.
It can be provided by a thick film method by printing / baking a strike, or a thin film method such as metal deposition or electrodeposition. 2 is a membrane electrode 1
It is a low melting point metal piece connected between 1 and 11 by side contact or welding.

Numeral 3 is a flux applied to a low melting point metal piece, and similarly to the above, a flux containing rosin such as pine resin as a main component and a small amount of an activator such as aniline hydrochloride can be used. Numerals 1 and 1 are lead wires (usually insulating coated copper wires or bare copper wires are used) connected to each of the membrane electrodes 11 and 11 by contact or welding. 50 is an epoxy resin material coated on one side of the ceramic substrate 40,
Similar to the above, it is room temperature curable, contains inorganic particles such as calcium carbonate, aluminum hydroxide, talc, silica and titanium oxide, and the color of the cured product is white or gray.

As the above-mentioned epoxy resin material, a substantially colorless epoxy resin containing a room temperature curing agent of amines is used, and any one of calcium carbonate, aluminum hydroxide, talc, silica, titanium oxide, etc., or two or more kinds of inorganic particles are used. Body 30
It is possible to use a mixture of -60% by weight.

In the present invention, in the case of a substrate type alloy type temperature fuse, a resistance mounting film electrode is provided on the back surface of the ceramic substrate, and a film resistor is printed on the resistance paste across these electrodes. It is also possible to implement it as a substrate type resistance / temperature fuse by providing it by baking, connecting lead wires to each of these electrodes, and covering the entire surface of the ceramic substrate including both sides of the epoxy resin material. .

The substrate type resistance / temperature fuse shown in FIG.
As shown in FIG. 5, a ceramic substrate (usually made of alumina ceramics, which is white) 40 is provided on one surface thereof with a membrane electrode 12 of a predetermined pattern by printing or baking a conductive paste. The film resistor 6 is provided between the resistance mounting portions 121, 121 by printing or baking a resistance paste, and the temperature fuse mounting portion 122, of the same as above.
The low melting point metal piece 2 is connected between 122 and the low melting point metal piece 2
Flux 3 (similar to the above, containing rosin such as pine resin as a main component and a small amount of an activator, for example, aniline hydrochloride, etc.) was applied, and the lead wire 1 was attached to both ends of the same membrane electrode 12. , 1 is connected, and one side of the ceramic substrate contains room temperature-curable one of calcium carbonate, aluminum hydroxide, talc, silica, titanium oxide, etc., or two or more kinds of inorganic particles, as described above. It can also be carried out by coating an epoxy resin material 50 in which the color of the cured product is white or gray.

In the substrate type temperature fuse shown in FIG. 3 and the substrate type resistance / temperature fuse shown in FIG. 4, not only one side of the substrate but also the other side, that is, both sides of the above room temperature An epoxy resin material that is curable and contains any of calcium carbonate, aluminum hydroxide, talc, silica, titanium oxide, etc., or two or more kinds of inorganic particles, and the color of the cured product is white or gray. Can also be coated by a dip coating method or the like.

[0024]

INDUSTRIAL APPLICABILITY Inspection of alloy type temperature fuse according to the present invention
In the method , inorganic particles are blended with a case type alloy type temperature fuse epoxy resin encapsulant or a substrate type alloy temperature fuse epoxy resin coating material, and calcium carbonate is added to the inorganic particles. , Aluminum hydroxide, talc, silica, titanium oxide, etc., the color after curing of the sealing portion or the coating layer is white or gray, and the flux (pale yellow to light yellow to Since it has a higher color contrast with dark brown, defective products with flux penetrating and exposing the sealing part or coating layer can be reliably extracted and eliminated by visual inspection, and the electrical equipment is protected by such defective products. You can avoid defects.

Further, calcium carbonate, aluminum hydroxide, talc, silica, titanium oxide, etc. have been established as fillers for epoxy resin insulating materials, and the insulating properties of alloy type temperature fuses can be well guaranteed. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a case type thermal fuse showing claim 1.

FIG. 2A is a sectional view of another example of the case type thermal fuse according to claim 1, and FIG. 2B is a sectional view taken along line A-B of FIG.

3 (A) is an explanatory view of a substrate type thermal fuse showing claim 2, and FIG. 3 (B) is a cross-sectional view taken along the line of FIG. 3 (A).

FIG. 4 is an explanatory view of a substrate type resistance temperature fuse showing a third aspect.

[Explanation of symbols]

1 lead wire 2 Low melting point metal pieces 3 flux 4 Ceramics tube 5 Epoxy resin material 11 Membrane electrode 12 membrane electrodes 40 ceramics substrate 50 Epoxy resin material

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-111562 (JP, A) Actual development Hei 3-91642 (JP, U) Actual development Sho-58-14643 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) H01H 37/76

Claims (4)

(57) [Claims] 1. A low melting point metal piece is connected between lead wires, a flux is adhered to the low melting point metal piece, and the flux adhering low melting point metal piece is covered with a ceramic case. In the temperature fuse which is sealed with an epoxy resin material between the opening of the space and the lead wire,
The color of the epoxy resin material after curing is white or gray.
Epoxy resin composition (excluding those containing alumina)
() Is used to prevent the flux from penetrating the seal and being exposed.
To remove and remove good temperature fuses by visual inspection
Characteristic alloy type temperature fuse inspection method. 2. A pair of membrane electrodes are provided on one surface of a ceramic substrate, a low melting point metal piece is connected between these membrane electrodes, flux is attached to the low melting point metal piece, and a lead is attached to each membrane electrode. In a temperature fuse in which wires are connected and one surface of a ceramic substrate is coated with an epoxy resin material, an epoxy resin composition (alumina compounded with a cured color of white or gray is added to the above epoxy resin material. Except)
Bad temperature at which flux is exposed through the coating layer
Characterized by removing and removing fuses by visual inspection
Alloy type temperature fuse inspection method. 3. A predetermined surface is formed on one side of an alumina ceramic substrate.
The membrane electrode of the pattern is printed or printed with a conductive paste.
Is provided between the resistance attachment parts of the membrane electrode.
The body is provided by printing, baking, etc. of the resistance paste.
A low melting point metal piece is connected between the temperature fuse mounting parts of the upper membrane electrode.
Flux is applied to the low melting point metal piece 2 and
Lead wires are connected to both ends of the upper membrane electrode, and
Substrate type resistor with epoxy resin coated on one side of the substrate
・ Curing to the above epoxy resin material at temperature fuse
Epoxy resin composition whose color is white or gray
(Excluding those containing mina), and coated with flux
Defective substrate type resistance / temperature fuse exposed through the layer
Substrate type characterized by being removed and removed by visual inspection
Resistance / temperature fuse inspection method. 4. The alloy type temperature fuse according to claim 1 or 2.
It is an alloy type temperature fuse that is inspected by the inspection method of
An alloy type temperature fuse in which any of calcium carbonate, aluminum hydroxide, talc, silica, titanium oxide, or two or more kinds thereof are mixed in the epoxy resin composition.