JPS63102788A - 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, this type of mesh outer blade has been made extremely thin (for example, 50 μm) over the entire hair introduction hole area using an electroforming method so that even thick hair can be closely shaved.

[Problem that the invention seeks to solve]

However, with such a very thin cross-grained outer blade,
As shown in Figure 6, the outer blade M and inner blade N
When shearing between them, an outward force P acts on the cutting edge of the outer cutter M, causing a phenomenon in which the outer cutter M locally lifts outward. As a result, the quality of the shave deteriorates.

The present invention has focused on this fact and aims to provide a mesh-like outer blade that enables a close shave and provides a good shave.

[Means for solving problems]

This invention divides a hair introduction hole area A which has a large number of hair introduction holes 1 and has a thinner thickness in a mesh outer cutter into several sections, and each hair introduction hole area A has a thickness smaller than that of the area. It shall be surrounded by a reinforced region B that is made thicker.

Here, the reinforcing region B is for reinforcing the thin hair introduction hole region A to prevent local lifting of the hair introduction hole region A. Therefore, hair is introduced into this reinforcing region B for cutting. It is optional to provide a hair introduction hole as much as possible, or to provide a blind wall without providing any hair introduction hole.

〔Effect of the invention〕

According to this invention, since the thickness tl of the 7-hair introduction hole area A is made thinner, even thick hair can be shaved closely from the root. Since the reinforcing region B is surrounded and reinforced, local lifting of the hair introduction hole region A during shaving can be effectively suppressed and the shaving taste is extremely good.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Figure 1 shows an example of the outer blade of a vibrating electric shaver.The outer blade is located at the center of the outer blade in a direction perpendicular to the direction of vibration of the inner blade which vibrates on the inner surface of the outer blade in the front and back direction (the same applies hereinafter). In the department,
The hair introduction hole area A (the part surrounded by thick lines in the figure) in which a large number of hair introduction holes 1 are arranged is arranged at a predetermined interval in the left and right direction (the inner blade vibration direction, the same applies hereinafter), and the left and right Reinforcement regions B are formed between adjacent hair introduction hole regions A-A and on the front and rear sides of each hair introduction hole region A, respectively.

Each hair introduction hole 1 in the hair introduction hole area A is relatively wide and short in length in order to mainly introduce short hairs, and the hair introduction hole 1 between the hair introduction hole area A and A is relatively wide and short in length. Also in the reinforcement area B, there is a hair introduction hole 1 having the same shape and size as the hair introduction hole 1 in the area A.
are arranged in a row on the same pitch. However, in order to mainly introduce long hair into the reinforcement areas B on the front and rear sides of the hair introduction hole area A, hair introduction holes 3 longer than the length of the hair introduction hole 1 are provided.
are arranged in a staggered manner in the left and right direction.

The thickness tl of the hair introduction hole area A is thin, and the thickness t2 of the reinforcement area B
is made larger than the thickness tl of the region A. Specifically, the thickness tl of the single hair introduction hole region A is 40 to 50 μm, preferably 45 μm, and the thickness t2 of the reinforcing region B is 55 to 65 μm.
Preferably it is set to 55 μm.

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 Figure 2 (al), a conductive electroforming master mold 1
0, an electrical insulating film 11 having a pattern corresponding to the hair introduction hole 1 in the hair introduction hole region A to be made thinner is formed on the surface of each electrical insulation film 11! i! A notch 12 is formed in 11.

This notch 12 is provided to make the thickness tl of the region A thinner than the thickness t2 of the reinforced region B, as will be described later.

The electrical insulating film 11 is.

As is well known, it is formed by coating or pasting a photoresist on the surface of the electroforming mother mold 100, and partially exposing it 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 a first electrodeposition, and as shown in FIG. 2(b), the mother mold 10 is electrically deposited. A surface S not covered by the insulating film 11.

That is, on the conductive surface of the matrix 10, a first blow-mold deposited layer 13 having a thickness exceeding the electrical insulating film 11 is formed.

By this primary assembly 4, a so-called sacrificial electrodeposition portion 14 is formed in the notch portion 12.

Next, the mother mold 10 is immersed in an aqueous solution of potassium dichromate or the like to perform a peeling treatment on the surface of the first blow mold depositing layer 13, and then a full-flexure coating such as nickel or an alloy of nickel and cobalt is applied. A second blow molding process is performed to form a second bonding layer 15, which will become the rib 2 between the hair introduction holes 1 and 1, on the surface of the first bonding layer 13 as shown in FIG. 2(C). . This second
Also by blow molding, the electrodeposited portion 16 is formed on the disposable electrodeposited portion 14.
is formed.

The reinforcing region B is also electroformed on the same master mold 10 at the same time, but in the electrodeposition of this region B, no 9 sacrificial electrodeposited portions are formed as shown in FIG.

Finally, if the mother mold 10 is pulled up from the electrodeposition bath and the second bonding layer 15 is peeled off from the peeling-treated surface of the first blowing die bonding layer 13,
Hair introduction holes 1 and 3 as shown in Figure 2+d) and Figure 4.
．． and a rib 2 having a countersink 17 on the inner surface.

When the second bonding layer 15 in area A is peeled off, since the sacrificial electrodeposited portions 14 and 16 are formed within the portion that will become the hair introduction hole 1, the first blowing bonding layer 15 is removed from the matrix 10 (Ill). Left with 13.

In this case, as shown in FIG. 3 (al (b)), the thickness tl of the single hair introduction hole area A is greater than the thickness t2 of the reinforcing area B by the amount electrodeposited on the sacrificial electrodeposition parts 14 and 16. Become thin.

That is, in the electrodeposition method, the amount of electrodeposition per unit area is almost constant, and therefore, by forming the sacrificial electrodeposition parts 14 and 16 in the region as described above, the electrodeposition area per unit area can be reduced. If it is increased more than that in area B, the electrodeposition thickness in area A, that is, the thickness of the rib 2, will be thinner than that in area B. This is because the thickness of the rib 2 is proportional to the electrodeposition thickness, and as the electrodeposition thickness becomes thinner, the rib thickness becomes smaller.

To avoid changes in mechanical strength due to sudden changes in the thickness of the boundary between hair introduction hole area A and reinforcement area B, and to prevent poor contact with the inner blade, the thickness of the outer periphery of the area should be gradually reduced. It is preferable that the thickness be close to that of region B. This can be done by using the above-mentioned electroforming method, and the area of the opening of the notch 12 which becomes the sacrificial electrodeposited parts 14 and 16 on the outer periphery of the region A can be set gradually smaller as it approaches the region B.

[Another example]

FIG. 5 shows another embodiment of the arrangement of the regions A-B, in which the hair introduction hole region A is partitioned into a large number of sections by reinforcing regions B running in a diagonal grid pattern.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a plan view of the outer cutter, and FIG.
)・(dl is the manufacturing process diagram of area A of the outer blade by electroforming method,
Figures 3 (a) and (b) are cross-sectional views that compare and show the thickness of area A-B of the outer blade, and Figure 4 is a manufacturing process diagram of area B of the outer blade, corresponding to Figure 2 (C). FIG. FIG. 5 is a plan view showing a modified example of how the regions A-B of the outer cutter of the present invention are arranged. FIG. 6 is a cross-sectional view showing an aspect of the hair clip. 1.3... Hair introduction hole. 2. . . . Ribs. A: Hair introduction hole area. B...Reinforcement area.

Claims (1)

[Claims] (1) Divide the hair introduction hole area A, which has a large number of hair introduction holes 1 and have a reduced thickness, into several sections, and make each hair introduction hole area A thicker than the thickness of the area A. A mesh outer blade for an electric shaver, characterized in that it is formed in a shape surrounded by a reinforced region B.