JPS61253088A - Electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the improvement of rotating or vibrating electric shavers, and particularly aims to provide outer cutters with excellent wear resistance.

[Background of the invention]

The outer blades used in conventional electric razors are made of nickel electroforming or pressed thin stainless steel sheets, so if used for a long time, they will discolor due to sweat and other factors, reducing the product's value. In particular, sliding friction between the outer cutter and inner cutter may cause a solid solution layer to form between the metals of the two, and the area of the sliding surface increases due to wear, resulting in high frictional resistance, large sliding load, and power consumption. It has disadvantages such as increased size.

[Purpose of the invention]

The purpose of the present invention is to eliminate such drawbacks of the prior art,
To provide an electric shaver with excellent durability and low sliding resistance.

[Summary of the invention]

In order to achieve this object, the present invention is achieved by forming a nickel nitride film on at least the sliding surfaces of the outer cutter and the inner cutter.

As a method for creating the nickel nitride film, methods such as direct current sputtering, high frequency sputtering, magnetron sputtering, ion beam sputtering, ion blating, CVD, plasma (1, VD), etc. can be used. In the sputtering method, the desired nitrogen content can be obtained by controlling the ratio of argon gas and nitrogen gas and the high frequency power.On the other hand, in the ion blating method, the desired nitrogen content can be obtained by controlling the nickel deposition rate and the ratio of nitrogen or ammonia. Control nitrogen content.

::Especially when using the Suba method, argon and S
The deposition rate is too slow and the efficiency is poor, and at 5 W/CIA or higher, the deposition rate is in a saturated state. This may have negative effects such as reducing the strength of the target.

The film thickness of such a nickel nitride film is corrosion resistant [Embodiments of the Invention] Examples of the present invention will be described below.

Example 1 FIG. 1 is a schematic diagram of the high frequency spanner device used in Example 1. In the figure, 1 is argon gas, 2 is nitrogen gas, 3 is a heater, 4 is a substrate, and 15 is a lily. 6 is a high frequency power source, and 7 is an exhaust gas.

□ A predetermined number of outer blades 8 made of nickel electric i-blade' are attached to the board 4.
The target 5 is made of nickel, and the processing vessel 9 is
After reducing the pressure inside the chamber with the exhaust 7, the outer cutter 8 is heated to about 20°C by the heater 3, and the output of the high frequency power source 6 is kept constant at 3 W/d. Sputtering was performed by changing the gas pressure ratio of 0.5
A nickel nitride film with a thickness of μ was fabricated, and an outer cutter was formed by varying the composition ratio of the nickel and nitrogen layers in this film.

Embodiment 2 FIG. 2 is a diagram of the high-frequency ion plate "- IIllum configuration of the tin-plating device" used in Embodiment 2, in which the same reference numerals as in FIG. , 12 is a high frequency coil, 13 is nickel, 14 is an electron gun, and 15 is a processing container.

As in Example 1, the nickel electroformed outer blade 8 is held on the substrate 4, the output of the electron gun 14 is set to 4:5 kW to evaporate the two, and the pressure of the argon gas 1 is set to 1×10''.
forr, nitrogen millet gas 2° pressure 8×1O-5Torr
, ii Frequency power ゛'5OoW, application type/pressure' 5oo
A nickel nitride film having a thickness of 0.5 μm was formed under the following conditions. ′-゛Comparative Example 1 ′″ □Example 1
Nickel electroformed blade before the formation of dinickel nitride film.

[Effects of the invention] '□ An electric shaver was assembled using the outer cutter produced above, and the drive current was measured, and the results were compared with the measurement results of the drive current after further use for 50 hours.

FIG. 3 shows the results of 8 measurements made in Example I with different ratios of argon and nitrogen. □・
In Figure 3, the horizontal axis shows the gas pressure ratio, and the vertical axis shows the driving current. As you can see from the diagram, the initial nitrogen content is
(Although the driving current decreases as it increases, after 50 hours of use, a gas pressure ratio between 0.2 and 0.7 is good with less change than the initial one, and the nitrogen content is O-
, 1 or less or 0.8 or more, the drive current is large.

,' Furthermore, an electric shaver was assembled using the outer cutter produced in Example 2, and the driving current was measured in the same manner, and the result was 490 mA at the initial stage and 520 mA after 50 hours of use.

Next, Comparative Example 1 was measured in the same manner, and the initial value was as high as 56 mA, and after 50 hours of use, it showed an increasing trend to 610 mA. Although the above embodiments and comparative examples both use a rotating dome-shaped outer cutter, it goes without saying that the same applies to a reciprocating reticulated outer cutter.

In addition, if a Niradal nitride film is formed not only on the sliding surface but also on the side that comes into contact with the skin, there is an effect that the nickel surface will not fade or discolor. □゛ ・ ・ A similar effect can be obtained by using an electroformed nickel-cobalt alloy using a nickel electroformed blade or a thin stainless steel plate as the outer blade base material.

As described above, by forming a nickel nitride film on at least the sliding surface of the outer cutter, an increase in drive current is suppressed and the load current is suppressed even when used for a long time, and an outer cutter with a long life can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an example of a sputtering apparatus for carrying out the present invention, FIG. 2 is a schematic explanatory diagram of an example of the same ion blating apparatus, and FIG. FIG. 3 is a characteristic diagram showing the results of measuring the value of drive current with respect to the ratio of nitrogen gas and nitrogen gas. Applicant Kyushu Hitachi Maxell Co., Ltd. Representative Takashi Fukuhara - Figure 1 * Figure 2

Claims (1)

[Claims] An electric shaver using an outer cutter with a nickel nitride film formed on at least the sliding surface with the inner cutter.