JPS63102786A - Reticulated outer blade of electric razor - Google Patents

Abstract

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

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mesh outer cutter for an electric shaver.

[Conventional technology]

Conventionally, as this type of outer cutter 9, for example, JP-A-55-87
As shown in Publication No. 05, a group of short hair introduction holes having a relatively large width and a short length coexists with a group of long hair introduction holes having a relatively small width and a long length.

Some methods attempt to introduce short hairs into short hair introduction holes and cut them, and introduce long hairs into long hair introduction holes and cut them short.

[Problem that the invention seeks to solve]

However, since such an outer blade is generally formed to have a substantially uniform overall thickness, the thickness of the area where the short hair introduction holes for introducing short hairs are arranged is the same as the thickness of the area where the hair introduction holes for introducing short hairs are arranged. The thicknesses of the arranged regions are equal. But this.

A problem arises between the area where the short hair introduction holes are arranged and the area where the hair introduction long holes are arranged. For example,
The entire outer blade allows for a close shave.

In other words, the overall thickness of the area where the hair introduction short holes are arranged and the area where the hair introduction long holes are arranged is made thin, but in this case, in the area where the hair introduction long holes are arranged, it is difficult to press the outer blade against the skin. When the hole is long (.

Moreover, as the skin becomes thinner, it becomes easier for some parts of the skin to hang down into the long hair introduction holes, and as a result, the inner blade rubs strongly against the hanging skin, damaging the skin and causing irritation in the skin after shaving. Makes the shave taste worse. On the other hand, if the outer blade is made thicker as a whole, the above-mentioned problem of stinging at the long hair introduction holes will be solved, but on the other hand, there will be a problem that it will not be possible to shave the hair short from the root in the area where one short hair introduction hole is arranged. occurs.

This invention has been made to solve these problems, and aims to provide an outer blade for an electric razor that enables close shaving of short hair and provides a good shave without causing irritation even on long hair. be.

[Means for solving problems]

In order to achieve the above object, the present invention provides an area A in which a large number of short hair introduction holes 1 are arranged for introducing short hair into the outer blade.
The thickness tl of the area B and the thickness t2 of the region B in which a large number of hair introduction slots 3 for introducing long hairs are arranged are set to satisfy the relationship tl<t2.

[Effect]

In such a case, the hair can be shaved closely from the root using the short hair introduction hole 1 in area A, which has a thin wall t1, and the hair introduction long hole 3 in area B, which has a larger thickness t2, increases the thickness. This will reduce the amount of sagging skin and allow you to shave long hair without any irritation.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

Figure 1 shows an example of the outer blade of a vibrating electric shaver, in which the outer blade is located at the center in the front-rear direction (direction perpendicular to the direction of vibration of the inner blade that vibrates on the inner surface of the outer blade; the same applies hereinafter). The inner blade vibrates in the left-right direction through the many short hair introduction holes 1 and the ribs 2 between the short hair introduction holes 1 and 1.

The same applies hereinafter) A region A formed over almost the entire length of the region A, and a hair introduction which is obliquely intersecting the front side and rear side of the region A at a predetermined angle with respect to the left and right direction, and which is longer than the length of the short hair introduction hole 1. Region B in which long holes 3 are arranged in a staggered manner in the left-right direction
-B, and a micropore region C-C in which numerous micropores 4 to the extent that hairs cannot be introduced are formed further forward of the long hole region B on the front side and further rearward of the long hole region B on the rear side. A solid portion is formed at the periphery surrounding these areas A-B-C.

As shown in FIGS. 3(a) and 3(b), the thickness tl of the area A where the short hair introduction holes 1 of this outer cutter are arranged is the thickness t2 of the area B where one long hair introduction hole 3 is arranged. Form thinner than Specifically, the thickness tl of region A in which nine hair introduction short holes 1 are arranged is 40 to 50 μm, preferably 45 μm, and the thickness t2 of the other region B in which one hair introduction long hole 3 is arranged is 55 to 65 μm.
m, preferably set to 55 μm. The thickness of each of the front and rear micropore areas C-C is 40 to 48 μm, and the plate thickness of the solid part is 3
The thickness is 5 to 45 μm.

Incidentally, as shown in FIG. 4, the Wi pore region C-C has the effect of being uniformly bent when the outer cutter is mounted on an electric shaver in an arched cross-section.

The aim is to increase the strength by increasing the moment of inertia of the area.

Next, an example of a method for manufacturing an outer cutter having the area A-B having the above configuration will be described. Here, electroforming is used.

First, as shown in FIG. 2(a), a conductive electroforming master mold 1
0, an electrically insulating film 11 having a pattern corresponding to the hair introducing short holes 1 of the hair introducing short hole region A described above is formed, and a notch 12 is formed in each electrically insulating film 11. This notch 12 is for making the thickness tl of the hair introduction short hole region A thinner than the thickness t2 of the other hair introduction long hole region B, as will be described later. The electrical insulating film 11 is formed by coating or pasting photoresist on the surface of the electroforming mold 10 as is well known.

It is formed by partially exposing this to light using a mask and developing it. Next, the electroforming mother mold 10 on which the electrical insulating film 11 has been formed is immersed in an electrodeposition tank (not shown) to perform primary electrodeposition, thereby forming the mother mold 10 as shown in FIG. 2(b).
A primary electrodeposited eyebrow 13 having a thickness exceeding the thickness of the electrical insulating film 11 is formed on the surface S not covered by the electrical insulating film 11, that is, on the conductive surface of the matrix 10.

By this first electrodeposition, a so-called sacrificial electrodeposition part 14 is formed in the notch part 2.

Next, the matrix 10 is immersed in an aqueous solution of potassium dichromate or the like to perform a peeling treatment on the surface of the first electrodeposited layer 13, and then a second electrodeposited layer of nickel or an alloy of nickel and cobalt is applied. Next, electrodeposition is performed to form a second blizzard deposited layer 15 on the surface of the first electrodeposited layer 13, as shown in FIG. Also by the second blow mold deposition, the electrodeposited portion 16 is formed on the sacrificial electrodeposited portion 14 .

The hair introduction long hole region B is also electroformed on the same matrix 10 at the same time, but in the electrodeposition of this region B, no sacrificial electrodeposited portion is formed, as shown in FIG.

Finally, if the mother mold 10 is pulled up from the electrodeposition tank and the second blizzard adhesion layer 15 is peeled off from the peel-treated surface of the first blown-mold adhesion layer 13,
As shown in FIG. 2(d) and FIG. 5, the short hair introduction hole 11
Hair introduction long hole 3. and a rib 2 having a countersink 17 on the inner surface. When the second blizzard adhesion layer 15 in area A is peeled off, since the sacrificial electrodeposition parts 14 and 16 are formed within the part that will become the hair introduction short hole 1, the matrix 1
It is left on the 0 side together with the first blow molding layer 13.

In this case, as shown in FIG. 3(al(b)), the thickness tl of the two-hair introduction short hole region A is larger than the thickness C2 of the single-hair introduction long hole region B at the sacrificial electrodeposited portion 14, 1.6. In other words, in the electrodeposition method, the amount of electrodeposition per unit area is approximately constant, and therefore, as described above, the electrodeposited portion 14 and 16 to increase the electrodeposition area per unit area than that of the hair introduction elongated hole region B, the electrodeposition thickness of the region A, that is, the thickness of the rib 2, becomes thinner than that of the region B. This is because the thickness of the rib 2 is proportional to the electrodeposition thickness, and the thinner the electrodeposition thickness is, the smaller the rib thickness will be.

To avoid changes in mechanical strength due to sudden changes in the thickness of the boundary between area A and area B, and to prevent poor contact with the inner cutter, the thickness of the outer periphery of the area is gradually reduced to the thickness of area B. It is preferable to get close to . This can be done by setting the opening area of the notch 12 which becomes the sacrificial electrodeposited parts 14 and 16 on the outer periphery of area A to be gradually smaller as it approaches area B in the electroforming method described above.

[Another example]

Figures 6 (al to C) all show other examples of how the areas A-B are arranged, and Figure 6 (a) shows areas A-B on one side of the outer cutter sectioned in the left-right direction. and area B on the other side.
It is arranged so that it exists. Fig. 6(b) shows a section of the outer cutter in the front-rear direction and a region A on one side.

They are arranged so that region B exists on the other side. In FIG. 6(C), the top of the outer cutter is divided into four equal parts in the front, back, left, and right directions, so that areas A-A and areas B-B are aligned in the diagonal direction of the outer cutter.

Further, the shape of the single hair introduction short hole 1 may be other than square, for example, pentagonal, hexagonal, circular, etc.

In addition, the shape of the long hair introduction hole 3 may be other than a long and narrow rectangular shape, for example, an ellipse or an oblong shape. It may be of a shape that makes it easy to introduce long hair.

〔Effect of the invention〕

According to the invention, the short hair introduction hole 1 for introducing short hair
The thickness tl of the region A in which the hair introduction holes 3 for introducing long hairs are arranged is made thinner than the thickness C2 of the region B in which the hair introduction holes 3 for introducing long hairs are arranged, so that close shaving of short hair is effective with the hair introduction short holes 1. This can be done reliably, and the thickness C2 of the region B where the long hair introduction holes 3 are arranged is made thicker than the thickness tl of the region A.

The hanging of the skin into the hair introduction elongated hole 3 can be reduced by the increase in thickness, and even long hair can be shaved cleanly without irritation. In addition, when looking at the mechanical strength of the entire outer blade, the thickness tl of the area A where the hair introduction short holes 1 are arranged
Even if it is formed thin, mechanical strength can be sufficiently ensured by the presence of the region B which is thicker than the region B.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a plan view of the outer cutter, and Figures 2 (a), ('b), and (
C1 and (d) are manufacturing process diagrams of region A of the outer cutter by electroforming, FIGS. 3A and 3B are cross-sectional views comparing the thickness of region A-B of the outer cutter, The figure is a partial external perspective view of the electric shaver showing the state in which the outer cutter is attached, and FIG. 5 is a sectional view showing the manufacturing process of area B of the outer cutter in accordance with FIG. (a), ('b), and (C) are all plan views showing modified examples of how the regions A-B of the outer cutter of the present invention are arranged. 1. Hair introduction short holes. 2. ... Rib. 3 ... Long hair introduction hole. A ... Area of short hair introduction hole. B ... Area of long hair introduction hole. Inventor Masahiko Ochiai Figure 4

Claims (1)

[Claims] (1) It has a region A in which a large number of short hair introduction holes 1 are arranged, and a region B in which a large number of long hair introduction holes 3 formed longer than the length of the short hair introduction holes 1 are arranged, and Thickness t of area A
A mesh-like outer blade for an electric shaver, characterized in that _1 is formed to be thinner than the thickness t_2 of the region B.