JP2002335814A - Fishhook and method for forming hard coating onto the fishhook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fishhook capable of preserving good characteristics even when used for a long period, and capable of improving fish-biting performances. SOLUTION: In this fishhook 1 used for fishing and composed of a base material 10 comprising a metal, a diamond-like carbon coating 30 is formed on at least an area of the base material 10 from its tip to a part to which a bait is touched through an intermediate layer 20 for increasing adhesion of the coating to the surface of the base material 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook for catching fish and a method for forming a hard coating on the hook.

[0002]

2. Description of the Related Art Fishing hooks conventionally used for fishing are formed by forming a metal base into a needle shape corresponding to the type and size of the fish to be fished, and applying a nickel plating film or the like to the surface of the base. I have. The nickel plating film or the like is provided for the purpose of preventing scratches on the surface of the base material and preventing corrosion of the base material.

[0003]

However, the effect of the plating film on this conventional fishing hook is not yet satisfactory. In particular, peeling of the plating film due to abrasion of the fishing hook at the rocky shore (especially on rocky shores), and the tooth coating of the tooth are difficult. The base material of the fishing hook was exposed by being scratched by a sharp fish, and corrosion proceeded from there, and the strength was sometimes significantly reduced. Further, if an impact or abrasion occurs on a damaged portion or a corroded portion of the hook, shape change or refraction is caused. Even if fishing is performed using a hook in such a state, catching of fish is extremely poor. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in a conventional hook, to maintain good fishing hook characteristics even in long-term use, and to improve the hooking of fish. I do.

[0004]

In order to achieve the above object, the present invention provides a fishing hook having the following hard coating and a method for forming a hard coating on the fishing hook for producing the same. The fishing hook according to the present invention has a base made of metal, and at least a portion of the base that comes into contact with the bait,
A diamond-like carbon film is formed via an intermediate layer that enhances the adhesion to the surface of the substrate.

[0005] The base material may be any one of hard steel wire, high carbon steel, nickel, iron, vanadium, aluminum, stainless steel, tungsten, and titanium. Further, the base material is made of a hard steel wire, and the composition of the hard steel wire is such that carbon (C) is 0.74.
0.86%, silicon (Si) is 0.15 to 0.35
%, Manganese (Mn) is 0.30 to 0.60%, phosphorus (P) is 0.030% or less, and sulfur (S) is 0.030%.
The following ratio is good.

The intermediate layer is made of silicon, tungsten,
It may have a one-layer structure formed of any one of titanium carbide, silicon carbide, and chromium carbide. Alternatively, the intermediate layer may have a two-layer structure including a lower layer mainly composed of chromium or titanium and an upper layer mainly composed of silicon or germanium. The intermediate layer may have a two-layer structure of a lower layer mainly composed of titanium and an upper layer mainly composed of any of tungsten, tungsten carbide, silicon carbide and titanium carbide. Still more preferably, the intermediate layer has a three-layer structure of a lower layer mainly composed of titanium, an intermediate layer mainly composed of titanium carbide or silicon carbide, and an upper layer mainly composed of carbon. It is desirable that the diamond-like carbon coating has a surface roughness Ra of 0.2 to 0.02 μm.

A method for forming a hard film on a hook according to the present invention is a method for forming a hard film on at least a portion of a fishhook for catching fish that comes into contact with a bait, and includes the following steps. And A step in which a metal base material is formed into a shape corresponding to the type and size of fish to be caught, and the washed fishing hook is set in a vacuum tank and evacuated, and argon is introduced into the evacuated vacuum tank to ionize it. Forming an intermediate layer on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by a sputtering process targeting any one of silicon, tungsten, titanium carbide, silicon carbide, and chromium carbide. Forming a layer, discharging argon in the vacuum chamber and introducing a gas containing carbon into the vacuum chamber, generating plasma in the vacuum chamber, and forming a diamond on the surface of the intermediate layer by plasma CVD. Forming a like carbon coating,

[0008] Instead of the intermediate layer forming step, argon is introduced into the evacuated vacuum chamber to ionize it, and a sputtering process using chromium or titanium as a target is performed to at least a portion of the hook that comes into contact with the bait from the tip. A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of chromium or titanium on the surface of the base material, and subsequent to this step, silicon is formed on the lower layer by a sputtering process using silicon or germanium as a target. Alternatively, a second intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of germanium may be performed to form two intermediate layers.

Alternatively, instead of the intermediate layer forming step, argon is introduced into the evacuated vacuum chamber to ionize it.
A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of titanium on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by a sputtering process using titanium as a target; Subsequently, by a sputtering process using tungsten as a target,
A second intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of tungsten on the lower layer may be practiced to form two intermediate layers.

[0010] In addition, by introducing argon into the evacuated vacuum chamber and ionizing the same, a titanium-targeted sputtering process is performed to form a titanium-based material on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook. A first intermediate layer forming step of forming a lower layer of the intermediate layer to be formed, and subsequent to this step, a gas containing carbon is introduced into the vacuum chamber, and the lower layer is formed by a reactive sputtering process using tungsten or silicon as a target. A second layer on which an intermediate layer mainly composed of tungsten carbide or silicon carbide is formed;
And an intermediate layer forming step may be performed to form two intermediate layers.

Alternatively, argon is introduced into the evacuated vacuum chamber to ionize it, and titanium is mainly applied to the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by sputtering using titanium as a target. A first intermediate layer forming step of forming a lower layer of the intermediate layer, and a gas containing carbon is introduced into the vacuum chamber, followed by a reactive sputtering process using titanium or silicon as a target, following the step. A second intermediate layer forming step of forming an intermediate layer mainly composed of titanium carbide or silicon carbide on the lower layer, and, following the step, the sputtering amount of titanium or silicon of the target is gradually reduced to form the intermediate layer. A third intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of carbon may be performed thereon to form three intermediate layers.

In the method for forming a hard coating on a fishing hook, after the step of forming the diamond-like carbon coating, the diamond-like carbon formed in the step is formed.
It is desirable to carry out a step of finishing and polishing the surface of the carbon film by polishing and lapping. The polishing and lapping in the final polishing step may be performed using a diamond paste or an alumina paste in which diamond particles or alumina particles having a particle diameter of 0.1 μm to 4 μm are scattered.

In these methods of forming a hard coating on a hook, the metal base of the hook is made of hard steel wire, high carbon steel, nickel, iron, vanadium, aluminum, stainless steel, tungsten, or titanium. It is good to use any one metal. Further, carbon (C) is 0.74 to 0.86 as a base material of the metal.
%, Silicon (Si) is 0.15 to 0.35%, manganese (Mn) is 0.30 to 0.60%, and phosphorus (P) is 0.0
It is desirable to use a hard steel wire having a composition of 30% or less and sulfur (S) of 0.030% or less.

[0014]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. [Embodiment of Fishing Hook] FIGS. 1A and 1B show an embodiment of a fishing hook according to the present invention, wherein FIG.
Is a partially enlarged view of a portion surrounded by a circle A when viewed from a direction indicated by an arrow P. This hook 1 is formed by a metal base such as a hard steel wire into a shape corresponding to the type and size of fish to be fished, and the tip of a hook portion 1a is thin and sharp, and a hook 1b
Is formed, and a hitting portion 1c for tying a fishing line is formed at a rear end portion.
Are formed. The hitting portion 1c is thin and wide as shown in FIG. 1 (b) so that the tied fishing line does not come off.

FIGS. 2A and 2B show another embodiment of the fishing hook according to the present invention, wherein FIG. 2A is a side view of the whole, and FIG. It is a partial enlarged view, and the same code | symbol is attached | subjected to the part corresponding to a figure.
The hook 1 'is also formed into a shape according to the type and size of the fish to be fished with a metal base such as a hard steel wire, and the hook portion 1a is formed.
Is sharply pointed, a retaining portion 1b is formed therein, and a hitting portion 1d for tying a fishing line is formed at a rear end portion. As shown in FIG. 2B, a through hole 11 is formed in the hitting portion 1d, and a fishing line can be passed through the through hole 11.

A hard coating, which will be described later, is formed on at least the portion of the hooks 1 and 1 'which comes into contact with the bait from the tip (most of the hook portion 1a, in this embodiment as a whole). FIG. 3 is an enlarged sectional view taken along line BB in FIG. 1A, and the same applies to an enlarged sectional view of a position corresponding to the fishing hook 1 'shown in FIG. As shown in FIG. 3, a diamond-like carbon film (hereinafter referred to as a “DLC film”) is formed on the surface of the metal base material 10 of the fishing hook 1 through an intermediate layer 20 that enhances the adhesion to the surface of the base material 10. 30)
Is formed.

This DLC film 30 has a diamond-like thin film.
Film, hard carbon coating, hydrogen amorphous carbon
Film, i-carbon film, etc.
An amorphous carbon thin film with similar structure and properties,
Vickers hardness is over 2000kg / mm2, hardness
High wear resistance and low friction coefficient for lubrication
It has properties of high corrosion resistance. Ma
In addition, the intermediate layer 20 is formed between the surface of the substrate 10 and the DLC film 30.
One or more thin film layers provided to enhance the adhesion to
Silicon (Si), tungsten
(W), titanium carbide (TiC), silicon carbide (silicon carbide)
-Byte: SiC), chromium carbide (CrxCy, for example)
Cr₂₃C₆, Cr₄C₁, Cr₇C ₃, Cr₃, C₂
Etc.).

As described above, the DLC film 3 is provided on at least the surface of the base material 10 of the hook 1a of the fishing hook 1 with the intermediate layer 20 interposed therebetween.
By forming 0, the DLC film 30 is firmly formed on the surface of the substrate 10 with good adhesion. Therefore, even if polishing or lapping is performed to further smooth the surface of the formed DLC film 30, it does not peel off. Also, even if the hook 1 is used and rubbed in the rocky field or bitten by a sharp-edged fish, the DLC film 30 does not peel off. Therefore, the durability of the fishing hook 1 is remarkably improved as compared with the conventional fishing hook, and the performance as a fishing hook does not deteriorate even if it is used for a long time for surf fishing or the like. Further, even when the DLC film 30 includes the intermediate layer, the DLC film 30 is not formed thickly only at the needle tip unlike the nickel plating film formed by the conventional wet electroplating and can be formed thin, so that the needle tip does not become dull. In addition, since the lubricating property is good, the frictional resistance is greatly reduced, so that there is also an effect that fish catch is improved. The same is true for the fishing hook 1 'shown in FIG.

The substrate 10 is preferably made of any one of hard steel wire, high carbon steel, nickel, iron, vanadium, aluminum, stainless steel, tungsten, and titanium. In many cases, a hard steel wire is used, and its composition is particularly such that carbon (C) is 0.74 to 0.8.
6%, silicon (Si) 0.15 to 0.35%, manganese (Mn) 0.30 to 0.60%, and phosphorus (P) 0.1%.
030% or less and sulfur (S) of 0.030% or less are preferably used. Whichever material is used for the base material 10 to form the hook, as described above,
By forming the DLC film 30 through the above, the durability of the DLC film 30 is remarkably improved, and the catch of fish is improved.

[Structure of Intermediate Layer] Next, various examples of the structure of the intermediate layer 20 will be described with reference to FIGS. In these figures, a very small portion near the surface of the hook portion 1a of the hook 1 or 1 'is greatly enlarged, and the DLC film 30 and the intermediate layer 2 are enlarged.
It is a schematic diagram which shows the structure of No. 0. FIG. 4 shows a structure in which a DLC film 30 as a hard film is formed on a surface 10a of a base material 10 made of a hard steel wire or the like via the above-described intermediate layer 20 having a single-layer structure. The intermediate layer is made of silicon (Si), tungsten (W), titanium carbide (TiC), silicon carbide (Si
C) or chromium carbide (CrxCy) to a thickness of about 0.05 μm to about 1 μm. D
The LC film 30 is formed to have a thickness of about 0.1 μm to 2.0 μm.

FIG. 5 shows an example in which an intermediate layer having a two-layer structure is formed. An intermediate layer 20 composed of a lower layer 21 and an upper layer 23 is formed on the surface 10a of the substrate 10, and the DLC film 3 is formed on the upper layer 23.
0 is formed. The lower layer 21 is formed mainly of chromium (Cr) or titanium (Ti), and the upper layer 23 is formed mainly of silicon (Si) or germanium (Ge). In this case, chromium or titanium of the lower layer 21 of the intermediate layer 20 can be formed with good adhesion to the base material 10 made of a hard steel wire or the like. Further, silicon or germanium of the upper layer 23 is a Group IVb element in the periodic table that is the same as carbon constituting the DLC film 30, and each has a diamond structure. Therefore, the upper layer 23 and the DLC film 30
And covalently bond with high adhesion. In addition, lower layer 2
The chromium or titanium 1 and the silicon or germanium of the upper layer 23 can form a film with good adhesion. Therefore, by forming the DLC film 30 on the surface 10a of the base material 10 with the intermediate layer 20 having such a configuration, the DLC film 30 can be formed with a stronger adhesion, and the durability of the fishing hook can be improved. It can be dramatically increased.

FIG. 6 shows another example of the intermediate layer having a two-layer structure. In this example, titanium (T
i) and an upper layer 23 mainly composed of one of tungsten (W), tungsten carbide (WC), silicon carbide (SiC) and titanium carbide (TiC). An intermediate layer 20 is formed and an upper layer 2
The DLC film 30 is formed on 3. Even in this case, the same adhesion of the DLC film 30 as in the example shown in FIG. 5 can be obtained.

FIG. 7 shows an example in which an intermediate layer having a three-layer structure is formed. In this example, the lower layer 21 mainly composed of titanium (Ti) is formed on the surface 10 a of the base material 10 as the intermediate layer 20.
Is formed thereon, an intermediate layer 22 mainly composed of titanium carbide (TiC) or silicon carbide (SiC) is formed thereon, and an upper layer 23 mainly composed of carbon (C) is further formed thereon. Then, a DLC film 30 is formed on the upper layer 23. In this case, the lower layer 21, the middle layer 22, and the upper layer 23 are not clearly different layers, and the titanium concentration is highest in a portion of the lower layer 21 adjacent to the base material 10, and the concentration gradually decreases toward the upper layer 23, The upper layer 23 may have a gradient structure in which the concentration of carbon is highest in the portion adjacent to the DLC film 30 and the concentration gradually decreases toward the lower layer 21. Rather, such an inclined structure can enhance the adhesion of the DLC film 30.

The DLC film 3 formed by each of these examples
In the case of No. 0, the surface is preferably polished and wrapped to have a mirror finish with a surface roughness Ra of about 0.2 to 0.02 μm.

[Embodiment of Method for Forming Hard Coating] Next, referring to FIGS. 8 to 11, a method for forming a hard coating on at least the portion of the fishing hook according to the present invention which comes into contact with the bait will be described. In the example described below, the DL is provided on almost the entire surface of the fishing hook 1 shown in FIG.
The case where the C film is formed will be described.

First, an intermediate layer forming step of forming the above-described intermediate layer 20 on the surface of the base material of the hook 1 will be described with reference to FIG. FIG. 8 is a sectional view of a sputtering apparatus used for forming an intermediate layer. As shown in this figure, a target holder 56 is fixed near one wall surface in a vacuum chamber 51 provided with a gas inlet 53 and an exhaust port 54, and a target 55, which is a material of an intermediate layer, is fixed there. Set (place).

A hard steel wire (for example, S
The washed fishing hook 1 formed into a shape according to the type and size of the fish to be fished by the base material according to WRH 77A) is set (arranged) so that the hook portion 1a faces the target 55. The hook 1 is connected to a DC power supply 58, and the target 55 is connected to a target power supply 57. In addition,
Although not shown, a shutter that can be opened and closed is provided between the target 55 and the fishing hook 1 at a position where the target 55 is covered and a position where the target 55 is exposed. The shutter is initially set at a position covering the target 55.

Then, the degree of vacuum in the vacuum chamber 51 is reduced to 4 × 10 ⁻³ Pascal (3 × 10 ⁻⁵ ) by an exhaust means (not shown).
The air is evacuated from the exhaust port 54 so that the pressure becomes equal to or less than torr). After that, an argon (Ar) gas is introduced as a sputtering gas from the gas inlet 53 to adjust the degree of vacuum in the vacuum chamber 51 to 4 × 10 ⁻¹ Pascal (3 × 10 ⁻³ torr). Thereafter, a negative DC voltage of −50 V is applied to the hook 1 from the DC power supply 58. A DC voltage of −500 V to −600 V is applied to the target 55 from the target power supply 57.
Then, plasma is generated inside the vacuum chamber 51, and the surface of the base material of the fishing hook 1 is ion bombarded with ionized argon to remove an oxide film and the like formed on the surface.

Next, a shutter (not shown) is opened to expose the target 55, and the surface of the target 55 is sputtered by argon ions in the plasma. If the target 55 is silicon, the silicon molecules hit from the surface thereof adhere to the surface of the base material of the fishing hook 1 to form an intermediate layer made of a silicon film. This intermediate layer forming step is performed so that the intermediate layer is formed to a predetermined film thickness by the sputtering process.

In the case of forming one intermediate layer 20 shown in FIG. 4, the target 55 may be made of silicon, tungsten, titanium carbide, silicon carbide (silicon carbide),
Then, any one of chromium carbide and chromium carbide is set, and the above-described sputtering treatment is performed. Thereby, an intermediate layer 20 of any of a silicon film, a tungsten film, a titanium carbide film, a silicon carbide (silicon carbide) film, or a chromium carbide film is formed on the surface of the base including the hook 1a of the hook 1. .

When an intermediate layer of a titanium carbide film or a silicon carbide film is formed, the following method can be employed. That is, titanium or silicon (silicon) is set as the target 55, and sputtering by argon ions is performed. At the same time, for example, methane (CH ₄ ) gas as a gas containing carbon is introduced from the gas inlet 53 to perform sputtering. By reactive sputtering process with titanium or silicon molecules and carbon in gas,
An intermediate layer 20 of a titanium carbide film or a silicon carbide film is formed on the surface of the base of the fishing hook 1.

When forming the two intermediate layers 20 shown in FIG. 5 consisting of the lower layer 21 and the upper layer 23, the vacuum chamber 5
1, two target holders 56 and a shutter for each of them are provided.
Set chromium or titanium as the target 55,
Silicon or germanium is set as the target 55 in the other target holder 56. First, in the first intermediate layer forming step, only the shutter on the side of the target holder 56 on which chromium or titanium is set as the target 55 is opened to perform a sputtering process.
A lower layer 21 made of a film mainly composed of chromium or titanium is formed on the surface of the base material of the fishing hook 1 to a thickness of about 0.1 μm. Subsequently, the target 55 is formed in a second intermediate layer forming step.
Only the shutter on the side of the target holder 56 in which silicon or germanium is set is opened to perform a sputtering process, and the upper layer 23 made of a film mainly composed of silicon or germanium is formed on the lower layer 21 to a thickness of about 0.1 μm.

Further, the lower layer 21 and the upper layer 23 shown in FIG.
Similarly, in the case of forming two intermediate layers 20 consisting of: two target holders 56 and a shutter for each of them are provided in the vacuum chamber 51, and titanium is set as the target 55 in one of the target holders 56. Then, any one of tungsten, tungsten carbide, silicon carbide, and titanium carbide is set as the target 55 in the other target holder 56. First, in the first intermediate layer forming step, only the shutter on the side of the target holder 56 on which titanium is set as the target 55 is opened to perform a sputtering process, and the surface of the base material of the fishing hook 1 is formed of a film mainly composed of titanium. The lower layer 21 has a thickness of 0.1 μm
Formed to the extent.

Subsequently, in a second intermediate layer forming step,
Only the shutter on the side of the target holder 56 on which any one of tungsten, tungsten carbide, silicon carbide, and titanium carbide is set as the target 55 is opened to perform sputtering, and tungsten, tungsten carbide, silicon carbide, An upper layer 23 of a film mainly composed of titanium is formed to a thickness of about 0.1 μm. Alternatively, after the lower layer 21 mainly composed of titanium is formed on the surface of the base material of the fishing hook 1 in the first intermediate layer forming step, tungsten or silicon is used as the target 55 in the second intermediate layer forming step. Is opened, and a gas containing carbon, for example, methane (CH ₄ ) gas, is introduced into the vacuum chamber 51 so that the sputtered tungsten or silicon molecules and the carbon in the gas are used. An upper layer 23 of an intermediate layer mainly composed of tungsten carbide or silicon carbide can be formed on the lower layer 21 by reactive sputtering.

Further, the lower layer 21 and the middle layer 22 shown in FIG.
In the case where the three intermediate layers 20 composed of the upper layer 23 and the intermediate layer 20 are also formed, and when the intermediate layer 22 is formed of a film mainly composed of silicon carbide, two target holders 56 in the vacuum chamber 51 A shutter is provided, and titanium is set as a target 55 in one target holder 56, and silicon is set as a target 55 in the other target holder 56. First, in the first intermediate layer forming step, only the shutter on the target holder side on which titanium is set as the target 55 is opened to perform a sputtering process, and the lower layer 21 made of a film mainly composed of titanium is formed on the surface of the base material of the fishing hook 1. To form Subsequently, in the second intermediate layer forming step, only the shutter on the target holder side where silicon is set as the target 55 is opened,
A gas containing carbon, for example, methane (C
H ₄ ) gas is introduced, and sputtered silicon molecules react with carbon in the gas to perform a reactive sputtering process.
Middle layer 2 of a film mainly composed of silicon carbide on lower layer 21
Form 2

Thereafter, in a third intermediate layer forming step, the shutter (not shown) in the vacuum chamber 51 is gradually closed to reduce the amount of silicon exposed as the target 55, thereby gradually reducing the amount of silicon sputtered. An upper layer 23 mainly composed of carbon whose carbon ratio is gradually increased is formed on 22. When the intermediate layer 22 is made of a film mainly composed of titanium carbide, the target holder 56 and the shutter in the vacuum chamber 51 may be a single set. Each step may be performed in the same manner as in the third intermediate layer forming step. However, there is no need to switch the opening and closing of the two shutters between the first intermediate layer forming step and the second intermediate layer forming step.

Next, the fishing hook 1 having the intermediate layer 20 formed on substantially the entire surface of the base material by the various intermediate layer forming steps as described above.
The step of forming the DLC film 30 on the intermediate layer 20 will be described with reference to FIGS. That is, this D
There are three types of DLC film forming methods for forming the LC film. First, a first DLC film forming method will be described with reference to FIG. FIG. 9 shows the plasma CVD used for that purpose.
It is sectional drawing of an apparatus. This first DLC film forming method includes:
A vacuum chamber 61 having a gas introduction port 63 and an exhaust port 65 and having an anode 79 and a filament 81 above the inside is used. Then, in the vacuum chamber 61, the fishing hook 1 having the intermediate layer 20 formed on substantially the entire surface of the base material by the above-described intermediate layer forming step is disposed. A member for supporting the hook 1 is not shown.

The degree of vacuum in the vacuum chamber 61 is 4 ×
Vacuum is exhausted from the exhaust port 65 by an exhaust means (not shown) so that the pressure becomes 10 ⁻³ Pascal (3 × 10 ⁻⁵ torr) or less. Thereafter, benzene (C ₆ H ₆ ) as a gas containing carbon is introduced into the vacuum chamber 61 from the gas inlet port 63, and the pressure in the vacuum chamber 61 is increased to 6.67 × 10 ⁻¹ pascal (5 × 10 ^−3). torr). further,
A DC voltage is applied to the hook 1 from the DC power supply 73, a DC voltage is applied to the anode 79 from the anode power supply 75, and an AC voltage is applied to the filament 81 from the filament power supply 77.

At this time, the DC voltage applied to the hook 1 from the DC power supply 73 is set to minus 3 kV, and the anode power supply 75
DC voltage applied to anode 79 from
The voltage applied from the filament power supply 77 to the filament 81 is an AC voltage of 10 V so that a current of 30 A flows. As a result, plasma is generated in the area around the fishing hook 1 in the vacuum chamber 61, and the plasma CVD process causes
A DLC film can be formed on the surface of the intermediate layer 20 (the upper layer 23 in the case of a multilayer intermediate layer) on the base material of the fishing hook 1. This DLC film is formed to a thickness of 0.1 μm to 2.0 μm. For convenience of explanation, a vacuum tank 51 used in the intermediate layer forming step and a vacuum tank 6 used in the DLC film forming step are used.
Each of these steps can be performed successively using the same vacuum chamber. In that case, after the intermediate layer forming step is completed, argon in the vacuum chamber is exhausted and a gas containing carbon is introduced.

Next, a second DLC film forming method will be described with reference to FIG. FIG. 10 is a sectional view of a plasma CVD apparatus used for that purpose. When the apparatus shown in FIG. 10 is used, the fishing hook 1 having the intermediate layer 20 formed therein is placed in a vacuum chamber 61 having a gas inlet 63 and an exhaust port 65.
Was placed, by the exhaust means (not shown) inside the vacuum chamber 61, a vacuum degree of 4 × ^{10 -3} pascals (3 × ^{10 -} 5 t
(or) Vacuum is exhausted from the exhaust port 65 so as to be less than or equal to or less.

Thereafter, methane gas (CH ₄ ) as a gas containing carbon is introduced into the vacuum chamber 61 through the gas inlet 63 to reduce the degree of vacuum to 13.33 Pa (0.1 torr).
r). Then, high-frequency power from a high-frequency power source 69 having an oscillation frequency of 13.56 MHz is applied to the fishing hook 1 via a matching circuit 67. As a result, plasma is generated around the hook 1 and the plasma CVD is performed.
The intermediate layer 20 formed on the base material of the hook 1 by the treatment
(In the case of a multilayer intermediate layer, the upper layer 23)
A film can be formed.

Next, a third DLC film forming method will be described with reference to FIG. FIG. 11 is a sectional view of a plasma CVD apparatus used for the apparatus. When the apparatus shown in FIG. 11 is used, the fishing hook 1 on which the intermediate layer 20 is formed is arranged in a vacuum tank 61 having a gas inlet 63 and an exhaust port 65, and the vacuum tank 61 The inside is evacuated from the exhaust port 65 so that the degree of vacuum is 4 × 10 ⁻³ Pascal (3 × 10 ⁻⁵ torr) or less.

Thereafter, methane gas (CH ₄ ) as a gas containing carbon is introduced into the vacuum chamber 61 from the gas inlet port 63 so that the degree of vacuum becomes 13.33 Pascal (0.1 torr). Then, a DC voltage of −600 V is applied to the hook 1 from the DC power supply 83 to generate plasma around the hook, and the intermediate layer 20 (multilayer intermediate layer) formed on the base material of the hook 1 by the plasma CVD process. In this case, a DLC film can be formed on the surface of the upper layer 23).

Also in the case of these DLC film forming methods, they can be performed continuously with the intermediate layer forming step by using the same vacuum chamber as the intermediate layer forming step. In that case, after the intermediate layer forming step is completed, argon in the vacuum chamber is exhausted and a gas containing carbon is introduced. In the case where the DLC film is formed by the method described with reference to FIG. 9 to FIG. 11, an example in which methane gas or benzene gas is used as the gas containing carbon has been described, but a gas containing carbon such as ethylene in addition to methane, or Evaporation vapor of a liquid containing carbon such as hexane can also be used.

In the above-described intermediate layer forming step and DLC film forming step, for convenience, one hook 1 is placed in the vacuum chamber 51 or 61.
Although it is illustrated that the film is formed by setting only the book, in practice, it is preferable that a large number of fishing hooks are set in a jig at a time, arranged in a vacuum chamber, and the film is formed while rotating the jig.

Next, in order to make the surface of the DLC film 30 formed on the surface of the base material 10 of the fishing hook 1 via the intermediate layer 20 smoother, the surface of the DLC film 30 is polished and wrapped. A step of finish polishing is preferably performed so that the surface roughness Ra becomes 0.2 to 0.02 μm. In that case, the cloth is polished with a diamond paste or an alumina paste, and the disk-shaped plate is wrapped with the diamond paste or the alumina paste. The particle size of diamond or alumina in the diamond paste or alumina paste at that time is about 0.1 μm to 4 μm, and 1 μm for polishing.
m or more, and for wrapping, 1 μm or less. Even if such a polishing process is performed, DL
Since the C film is firmly formed on the surface of the base material of the fishing hook 1 via the intermediate layer, it does not peel off.

[About the thickness of each film formed on the hook]
Here, various examples of the material and thickness of the intermediate layer formed on the surface of the base material of the fishing hook according to the present invention and the thickness of the DLC film will be described. (Example 1) Base material: SWRH77A Fish to fish: Flatfish Material Thickness (μm) Intermediate layer: Silicon 0.05 to 0.4 DLC: DLC 0.4 to 1.5

(Example 2) Base material: SWRH77A Fishing fish: Japanese flounder Material Thickness (μm) Intermediate layer: SiC 0.05 to 0.4 DLC: DLC 0.4 to 1.5

(Example 3) Base material: SWRH82A Fish to fish: Red sea bream Material Film thickness (μm) Intermediate layer: Ti / Si 0.05 to 0.4 DLC: DLC 0.3 to 1.5

(Example 4) Base material: SWRH82A Fishing fish: Ishidai Material Film thickness (μm) Intermediate layer: Mainly composed of Ti / Si / C 0.05 to 0.4 DLC: DLC 0.2 to 1.5 As for the types of fish to be caught in the embodiment of the present invention, the sea bream is the most powerful and the teeth are sharp, and the following, red sea bream, flounder,
It is order of flounder. Therefore, good adhesion and good corrosion resistance between the base material and the DLC film are in the order from Example 4 to Example 1. SWRH82A made of hard steel wire was used as the base material of the hook. However, in the case of a fishhook having a relatively weak momentum, a soft mouth and not sharp teeth, the SWRH7A was used.
7A can be used as a substrate.

Next, the results of a comparison test between a fishing hook (referred to as a DLC coated hook) according to the present invention and a conventional product will be described. -Salt water test The DLC-coated needle had about twice the corrosion resistance as compared with the conventional product. Abrasion test When fishing on a rocky place using a conventional product and a DLC-coated needle, the DLC-coated needle was about three times as long as the conventional product when comparing the scratches entering the needle and the abrasion of the tip of the needle. -Fish hook test The DLC coated needle has about 3 times the fish hook compared to the conventional product.

[0052]

As described above, according to the present invention, the durability of the hook is drastically improved, corrosion and deformation are reduced, and the good performance of the hook is maintained for a long period of time. be able to. Further, compared to the conventional nickel-plated fishing hook, the sharpening of the tip due to the coating film is drastically reduced, and the frictional resistance of the surface is also greatly reduced, so that the catch of the fish is extremely improved.

[Brief description of the drawings]

FIG. 1 is a side view and a partially enlarged view showing an embodiment of a fishing hook according to the present invention.

FIG. 2 is a side view and a partially enlarged view showing another embodiment of the fishing hook according to the present invention.

FIG. 3 is an enlarged sectional view taken along line BB in FIG.

FIG. 4 is a schematic diagram showing a configuration example of a hard coating by greatly enlarging a very small portion near the surface of a hook portion of a fishing hook according to the present invention.

FIG. 5 is a schematic diagram showing a configuration example when the number of intermediate layers is two.

FIG. 6 is a schematic diagram showing a configuration example when the intermediate layer is another two layers.

FIG. 7 is a schematic diagram showing a configuration example when the number of intermediate layers is three.

FIG. 8 is a sectional view of a sputtering apparatus used in an intermediate layer forming step in the method for forming a hard film on a fishing hook according to the present invention.

FIG. 9 is a sectional view showing an example of a plasma CVD apparatus used in a DLC film forming step in the method for forming a hard film on a fishing hook according to the present invention.

FIG. 10 is a sectional view showing another example of the plasma CVD apparatus.

FIG. 11 is a sectional view showing still another example of the plasma CVD apparatus.

[Explanation of symbols]

 1, 1 ': fishing hook 1a: hook portion 1b: retaining portion 1c, 1d: hitting portion 11: through hole 10: base material (made of metal) 10a: surface of base material 20: intermediate layer 21: lower layer of intermediate layer 22 : Middle layer of intermediate layer 23: Upper layer of intermediate layer 30: Diamond-like carbon coating (DLC film) 51, 61: Vacuum tank 55: Target 56: Target holder 57: Target power supply 58: DC power supply 69: High frequency power supply 73: DC Power supply 75: Anode power supply 77: Filament power supply 79: Anode 81: Filament

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidefumi Kasai 6-11-12 Tanashi-cho, Nishi-Tokyo, Tokyo Inside Citizen Watch Co., Ltd. (72) Inventor Yukio Well 14th Doyamacho Kita-ku Osaka-shi No. 29 Wako Tsusho Co., Ltd. Hayabusa Co., Ltd. (72) Inventor Takashi Torobe 47-3 Watase, Yoshikawa-cho, Miyoshi-gun, Hyogo F-term Co., Ltd. F-term (reference) 2B107 AA01 AA05

Claims (17)

[Claims] 1. A fishing hook for catching fish, wherein the base material is made of metal, and an intermediate layer is provided on at least a portion of the base material that comes into contact with the bait to enhance the adhesion to the surface of the base material. A fishhook characterized in that a diamond-like carbon film is formed through the hook. 2. The fishing hook according to claim 1, wherein the base material is hard steel wire, high carbon steel, nickel, iron, or the like.
A fishing hook comprising at least one metal selected from the group consisting of vanadium, aluminum, stainless steel, tungsten, and titanium. 3. The fishing hook according to claim 1, wherein the base material is a hard steel wire, and the hard steel wire has a composition of carbon (C) of 0.74 to 0.86% and silicon (Si). ) Is 0.15
0.35%, manganese (Mn) is 0.30 to 0.60
%, Phosphorus (P) is 0.030% or less, and sulfur (S) is 0.0% or less.
A fishhook characterized by a ratio of 30% or less. 4. The method according to claim 1, wherein the intermediate layer has a one-layer structure formed of any one of silicon, tungsten, titanium carbide, silicon carbide, and chromium carbide. A hook according to one of the preceding claims. 5. The method according to claim 1, wherein the intermediate layer has a two-layer structure including a lower layer mainly composed of chromium or titanium and an upper layer mainly composed of silicon or germanium. The hook according to the item. 6. The intermediate layer has a two-layer structure of a lower layer mainly composed of titanium and an upper layer mainly composed of any one of tungsten, tungsten carbide, silicon carbide and titanium carbide. The hook according to any one of claims 1 to 3. 7. The intermediate layer has a three-layer structure of a lower layer mainly composed of titanium, an intermediate layer mainly composed of titanium carbide or silicon carbide, and an upper layer mainly composed of carbon. The hook according to any one of claims 1 to 3. 8. The fishing hook according to claim 1, wherein the diamond-like carbon coating has a surface roughness Ra of 0.2 to 0.02 μm. 9. A method of forming a hard coating on at least a portion of a fishhook for catching fish that comes into contact with a bait, wherein a metal substrate is formed into a shape according to the type and size of fish to be fished, Setting the washed fishhook in a vacuum chamber and evacuating it; introducing argon into the evacuated vacuum chamber to ionize it;
An intermediate layer that forms an intermediate layer on the surface of the base material at a portion that comes into contact with the bait from at least the tip of the fishhook by a sputtering process that targets any one of silicon, tungsten, titanium carbide, silicon carbide, and chromium carbide. A layer forming step, a step of discharging argon in the vacuum chamber and introducing a gas containing carbon into the vacuum chamber, generating a plasma in the vacuum chamber, and a surface of the intermediate layer by a plasma CVD process. Forming a diamond-like carbon coating on the fishhook. 10. A method for forming a hard coating on at least a portion of a fishhook for catching fish that comes into contact with bait, wherein a metal substrate is formed into a shape corresponding to the type and size of fish to be fished, and washing is performed. Setting the made hook in a vacuum chamber and evacuating it; introducing argon into the evacuated vacuum chamber to ionize it;
A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of chromium or titanium on a surface of the base material at a portion contacting the bait from at least the tip of the fishing hook by a sputtering process using chromium or titanium as a target. A second intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of silicon or germanium on the lower layer by a sputtering process using silicon or germanium as a target following the step; Exhausting argon and introducing a gas containing carbon into the vacuum chamber; generating plasma in the vacuum chamber; and forming a diamond-like carbon coating on the upper surface of the intermediate layer by plasma CVD. Forming a hard coating on the hook. 11. A method for forming a hard film on at least a portion of a fishhook for catching fish that comes into contact with a bait, wherein a metal substrate is formed into a shape according to the type and size of fish to be fished, and washing is performed. Setting the made hook in a vacuum chamber and evacuating it; introducing argon into the evacuated vacuum chamber to ionize it;
A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of titanium on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by a sputtering process using titanium as a target; Subsequently, a second intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of tungsten on the lower layer by a sputtering process using tungsten as a target, and discharging argon in the vacuum chamber, A step of introducing a gas containing carbon into the vacuum chamber; and a step of generating plasma in the vacuum chamber and forming a diamond-like carbon film on the surface of the upper layer of the intermediate layer by plasma CVD. Method for forming a hard coating on 12. A method for forming a hard coating on at least a portion of a fishhook for catching a fish that comes into contact with a bait, wherein a metal substrate is formed into a shape according to the type and size of the fish to be fished, Setting the washed fishhook in a vacuum chamber and evacuating it; introducing argon into the evacuated vacuum chamber to ionize it;
A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of titanium on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by a sputtering process using titanium as a target; Subsequently, a gas containing carbon is introduced into the vacuum chamber, and the upper layer of the intermediate layer mainly containing tungsten carbide or silicon carbide is formed on the lower layer by a reactive sputtering process targeting tungsten or silicon. 2, an intermediate layer forming step, a step of discharging argon in the vacuum chamber and introducing a gas containing carbon into the vacuum chamber, and generating a plasma in the vacuum chamber. Forming a diamond-like carbon coating on the surface of the upper layer of the layer; and forming a hard coating on the hook. 13. A method of forming a hard coating on at least a portion of a fishhook for catching fish that comes into contact with bait, wherein a metal substrate is formed into a shape according to the type and size of fish to be fished, Setting the washed fishhook in a vacuum chamber and evacuating it; introducing argon into the evacuated vacuum chamber to ionize it;
A first intermediate layer forming step of forming a lower layer of an intermediate layer mainly composed of titanium on the surface of the base material at a portion in contact with the bait from at least the tip of the fishing hook by a sputtering process using titanium as a target; Subsequently, a gas containing carbon is introduced into the vacuum chamber, and a reactive sputtering process using titanium or silicon as a target is performed to form an intermediate layer of an intermediate layer mainly composed of titanium carbide or silicon carbide on the lower layer. And an intermediate layer forming step of forming an upper layer of an intermediate layer mainly composed of carbon on the intermediate layer by gradually reducing a sputtering amount of titanium or silicon of the target after the step. Discharging a gas containing argon and carbon in the vacuum chamber,
Introducing a gas containing carbon again into the vacuum chamber, generating plasma in the vacuum chamber, and forming a diamond-like carbon film on the upper surface of the intermediate layer by plasma CVD. A method for forming a hard film on a hook. 14. The method for forming a hard coating on a fishing hook according to claim 9, wherein after the step of forming the diamond-like carbon coating, the diamond-like carbon formed in the step is formed. A method of forming a hard coating on a fishing hook, comprising a step of finishing and polishing the surface of the coating by polishing and lapping. 15. The polishing and lapping in the step of finish polishing, the particle diameter is from 0.1 μm to 4 μm.
The method for forming a hard coating on a fishing hook according to claim 14, wherein the method is performed using a diamond paste or an alumina paste in which μm diamond particles or alumina particles are scattered. 16. The method for forming a hard coating on a hook according to any one of claims 9 to 15, wherein the metal base material is a hard steel wire, high carbon steel, nickel, iron, vanadium, or aluminum. A method for forming a hard coating on a fishing hook, comprising using any one metal among stainless steel, tungsten, and titanium. 17. The method for forming a hard coating on a fishing hook according to claim 9, wherein carbon (C) is 0.74 to 0.8 as the metal base material.
6%, silicon (Si) 0.15 to 0.35%, manganese (Mn) 0.30 to 0.60%, and phosphorus (P) 0.1%.
A method for forming a hard coating on a fishing hook, comprising using a hard steel wire having a composition of 030% or less and sulfur (S) of 0.030% or less.