JPS628779A - Reticulated outer blade of reciprocal type 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 [Field of Industrial Application] The present invention relates to a mesh outer cutter for a reciprocating electric shaver.

[Conventional technology]

FIG. 6 shows an example of a conventional mesh-like outer cutter, in which the hair introduction hole area A in which a large number of hair introduction holes 1 are formed has a substantially uniform thickness over the entire area, and the hair introduction holes 1 are The aperture ratio (opening area/area area) is set approximately uniformly over the entire area.

[Problem that the invention seeks to solve]

However, in such an outer blade structure that equalizes the thickness and the aperture ratio of the hair introduction holes 1 over the entire hair introduction hole area A, for example, the hair introduction hole area A is made uniform in order to enable shaving. If the thickness is made thinner over the entire area, the thinnest solid part on the outer periphery of the single hair introduction hole area A will also become thinner, and the mechanical strength of the entire outer cutter will tend to decrease. However, if the thickness is increased, even if strength can be ensured, it will not be possible to get a close shave. Also, if the aperture ratio of the hair introduction hole 1 is small over the entire area A, it will be difficult to capture hair, and if it is large, the hair will be captured better, but on the other hand, the width of the rib between the two hair introduction holes will be narrower. 9 Mechanical strength tends to weaken.

In other words, the thickness of the entire 9-hair introduction hole area A,
Furthermore, with the conventional outer blade structure that equalizes the aperture ratio of the hair introduction holes 1, it is difficult to ensure mechanical strength, capture hair well, and provide a close shave.

Therefore, the present invention maintains good sliding contact with the inner cutter even within the hair introduction hole area of the mesh outer cutter during use.

In addition, we focused on the fact that there are areas that are most likely to come into contact with the skin and areas that are less so. By changing the aperture ratio of each, the aim is to obtain a mesh-like outer blade that secures mechanical strength, easily traps hair, and enables a close shave.

Means for Solving the τ Problem] In order to achieve the above object, in the present invention, as shown in FIG. .

The pore area is set to be thinner than the thickness of another hair introduction hole area A2 surrounding the outer periphery of the area A1, and larger than the pore area of the hair introduction hole 1.

[Effects of the Invention] According to the present invention configured as described above, the thickness of the hair introduction hole area AI around the intersection point 0 of the diagonal lines of the outer blade that is most in contact with the skin, that is, the effective hair trapping and shaving area, is Since the hair introduction hole area A2 is made thinner than that of the hair introduction hole area A2, a close shave can be effectively performed. Therefore, hair can be captured effectively. Moreover, in terms of mechanical strength, the mechanical strength is improved by the existence of a region A2 having a thickness larger than the thickness of the hair introduction hole region A1 around the intersection point 0 of the outer blade diagonal line and a smaller pore size than that of the hair introduction hole region A1. Sufficient capacity can be secured.

〔Example〕

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

FIG. 1 shows an example of the mesh-like outer blade of the reciprocating electric shaver according to the present invention, and the outer blade has a large number of hair introduction holes 1 in the center in the front-rear direction and ribs between the hair introduction holes 1 and 1. A hair introduction hole region A in which 2 is formed over almost the entire length in the left and right direction, and slanted long holes 3 are provided in a row in the left and right direction on the front side and the back side of the hair introduction hole region 1, respectively. Hole regions B1 and B2, and further forward of the long hole region B1 on the front side.

A micropore region C1 in which micropores 4 to the extent that countless hairs cannot be introduced are formed further rearward of the long hole region B2 on the rear side.
・C2, and these areas A-B1 ・B2・
A solid portion is formed around C1 and C2.

The hair introduction hole area A performs the shaving action, and the long hole area B1 and
B2 has a particularly effective shaving effect on long hair.

Incidentally, the micropore area C! - In C2, as shown in Fig. 4, when this outer cutter is attached to an electric shaver with an arched cross section, it can be bent uniformly.

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

As described above, the hair introduction hole area A is a substantially elliptical hair introduction hole area A1. That is, it is divided into an area A1 around the intersection 0 of the diagonal lines of the outer blade, and another hair introduction hole area A2 surrounding the outer periphery of this area A1. The thickness of the hair introduction hole region A1 that is in most contact with the skin is thinner than that of the other hair introduction hole region A2, and the thickness of the hair introduction hole region A1 of the region A1 is smaller than that of the other hair introduction hole region A2.
The aperture ratio of the area A2 is set to be larger than that of the other area A2.

Next, an example of a method for manufacturing an outer cutter having regions A1 and A2 having such a configuration will be described. Here, electroforming is used.

First, as shown in FIG. 2(a), a conductive electroforming master mold 1
0, an electrical insulating film 11 having a pattern corresponding to the hair introduction hole 1 of the hair introduction hole region A1 described above is formed,
A notch 12 is formed in each electrical insulating film 11. This electrical insulating film 11 is formed, as is well known, by coating or pasting a photoresist on the surface of the electroforming mold 10, and partially exposing it to light using a mask and developing it.

Next.

The electroforming mother mold 10 with the electrical insulating film 11 formed thereon is immersed in an electrodeposition tank (not shown) to perform primary electrodeposition.

As shown in FIG. 2(b), primary electrodeposition N1 exceeding the thickness of the electrical insulating film 11 is formed on the surface of the matrix 10 that is not covered with the electrically insulating film 11, that is, on the conductive surface of the matrix 10.
form 3.

A so-called sacrificial electrodeposition portion 14 is formed in the notch portion 12 by this first blow mold deposition tank.

Next, the mother mold 10 is immersed in an aqueous solution such as potassium dichromate to perform a peeling treatment on the surface of the first blow-moulding layer 13, and then a second blow-moulding layer 13 is applied. As shown in (a second blow mold adhesive layer 15 is formed on the surface of the first blow mold adhesive layer 13, which becomes the rib 2 between the hair introduction holes 1 and 1). An electrodeposited portion 16 is formed on the deposited portion 14 .

However, other hair introduction hole areas A2 except for one hair introduction hole area A1 are electroformed simultaneously on the same matrix 10,
Needless to say, no sacrificial electrodeposited portion is formed in the electrodeposition in this region A2. The shapes (patterns) of the hair introduction holes 1 and the ribs 2 are the same in both hair introduction hole areas A1 and A2.

Finally, if the mother mold 10 is pulled up from the electrodeposition bath and the second blow mold adhesive layer 15 is peeled off from the peeled surface of the first blow mold adhesive layer 13,
As shown in FIG. 2(d), an outer cutter having a bristle introduction hole 1 and a rib 2 having a countersink 17 on the inner surface is obtained. When this second blow mold coating 1i15 is peeled off, since the sacrificial electrodeposited portions 14 and 16 are formed within the portion that will become the hair introduction hole 1, they are left on the mother mold 10 side together with the first blow mold coating 1ii13.

In this case, the thickness of the nine-hair introduction hole area A1 becomes thinner than that of the other hair introduction hole area A2 by the amount of electrodeposited on the sacrificial electrodeposition parts 14 and 16. In addition, as the thickness becomes thinner, the pore opening ratio becomes larger than that of the other hair introduction hole area A2.

That is, in the electrodeposition method, the amount of electrodeposition per unit area is almost constant, and therefore, as described above, the hair introduction hole area A
1, by forming the sacrificial electrodeposition parts 14 and 16 to increase the electrodeposition area per unit area than that of the other hair introduction hole area A2, the electrodeposition thickness of @ area A1, that is, of the rib 2. The thickness will be thinner than that of area A2. Also.

When the thickness of the rib 2 is reduced by the sacrificial electrodeposition parts 14 and 16 in this way, the opening width w1 of the hair introduction hole 1 in the area A1 becomes larger than the opening width W2 of the hair introduction hole 1 in the other area A2. , the porosity becomes large. 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.

Incidentally, as a method to reduce the thickness of the hair introduction hole area A1,
Instead of the method of forming the sacrificial electrodeposition described above, it is conceivable to increase the electrodeposition area by increasing the exclusive area of the rib 2 portion by increasing the width of the rib 2 in the double hair introduction hole area A1, etc., but in such a case, Although it is possible to reduce the thickness as desired,
As the width of the ribs 2 is increased, the opening width of the hair introduction holes 1 becomes narrower, the opening ratio decreases, and it becomes difficult to capture one hair, so this method cannot be said to be a preferable method.

To give an example of the specific thickness dimension of the outer blade, 9 hair introduction hole area A
The thickness tl of 1 is 45 to 50 microns, the thickness t2 of the other hair introduction hole region A2 is 55 to 65 microns, the thickness of the front and rear micropore regions C1 and C2 is 40 to 48 microns, and the plate thickness of the solid part is 35 microns. ~45 microns.

In addition, in order to prevent changes in mechanical strength due to sudden changes in the thickness of the boundary between the 9-bristle introduction hole area A1 and the bristle introduction hole area A2, and to prevent poor contact with the inner blade, the 1-bristle introduction hole area A1 is It is preferable that the thickness of the outer peripheral portion gradually approaches the thickness of the other hair introduction hole region A2. This is done by setting the opening area of the notch 12, which becomes the sacrificial electrodeposited parts 14 and 16 on the outer periphery of the nine hair introduction hole area A1, gradually smaller as it approaches the other hair introduction hole area A2 in the electroforming method described above. Bye.

The hair introduction hole area A1 is formed into a substantially elliptical shape.

As shown in FIGS. 5(a), ('b), (C), and (d), it may be formed into a cross shape, two circles, a rhombus shape, a square shape, or the like.

[Brief explanation of the drawing]

・(C) and (d) are manufacturing process diagrams of the outer blade by electroforming method, and Figure 3 (a)/mountain) shows the thickness of the hair introduction hole areas A1 and A2 of the outer blade and the opening width of the hair introduction hole. FIG. FIG. 4 is a partial external perspective view of the electric shaver showing the state in which the outer cutters are attached. FIG. 5 (al, (bl, C1, <dl) are all plan views showing modified examples of the shape of region A1 of the outer cutter of the present invention. FIG. 6 is a plan view showing a conventional outer cutter. 1... Hair introduction hole. 2... Lip. A1... Hair introduction hole area. A2... Other hair introduction hole area. O... Outer. Intersection of blade diagonals. Patent applicant: Kyushu Hitachi Maxell Co., Ltd.
whistle 1 anti

Claims (1)

[Claims] (1) The hair introduction hole area A_1 around the intersection 0 of the outer blade diagonal line is replaced with another hair introduction hole area A_2 surrounding the outer periphery of the area A_1.
A mesh outer blade for a reciprocating electric shaver, characterized in that the mesh outer blade is thinner than the thickness of the hair introduction hole 1 and has an opening ratio larger than the opening ratio (opening area/area area) of the hair introduction holes 1.