JPH052349B2 - - Google Patents

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 a 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 The opening ratio (opening area/area area) of 1 is set almost uniformly over the entire area.

[Problem that the invention seeks to solve]

However, in such an outer blade structure that equalizes the thickness of the hair introduction hole area A and the aperture ratio of the hair introduction hole 1 over the entire hair introduction hole area A, for example, the hair introduction hole is If the thickness of the entire region A is reduced, the thinnest solid portion D on the outer periphery of the hair introduction hole region 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. In addition, if the pore size of the hair introduction holes 1 is small over the entire hair introduction hole area A, it will be difficult to capture hair, and if it is large, the hair will be captured better, but the width of the ribs between the hair introduction holes is It tends to become narrower and its mechanical strength becomes weaker.

In other words, with the conventional outer blade structure that equalizes the thickness of the hair introduction hole area A and the pore ratio of the hair introduction hole 1, it is possible to improve hair capture while ensuring mechanical strength. It is difficult to achieve a close shave.

Therefore, this invention maintains good sliding contact with the inner blade even within the hair introduction hole area of the mesh-like outer blade during use, and there are areas that are most likely to come into contact with the skin and areas that are less likely to come into contact with the skin. Focusing on that,
By changing the thickness and aperture ratio of the hair introduction holes in the hair introduction hole area that is most likely to come into contact with the skin and the hair introduction hole area that is not, the mechanical strength is ensured and the hair is removed. The objective is to obtain a mesh-like outer blade that is easy to grip and enables a close shave.

[Means for solving the problem] In order to achieve the above object, the present invention provides the first
As shown in the figure, the hair introduction hole area A ₁ around the intersection 0 of the outer blade diagonals, that is, the area that comes into most contact with the skin,
Other hair introduction hole areas surrounding the outer periphery of the area _A1
The pore area is set to be thinner than the thickness of _A2 and larger than the pore area of the hair introduction hole 1.

〔Effect of the invention〕

According to the present invention configured as described above, the thickness of the hair introduction hole area A ₁ 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 area for capturing and shaving hair, is different from that of other hair introduction holes. Since it is made thinner than that in area A ₂ , a close shave can be effectively performed, and the pore size of hair introduction hole 1 in area A ₁ is made larger than that in the other hair introduction hole area A ₂ . Therefore, hair can be captured effectively. Moreover, in terms of mechanical strength, the existence of a region _A2 around the intersection point 0 of the outer blade diagonals, which has a thickness greater than the thickness of the hair introduction hole region _A1 and a smaller aperture ratio than that, has a mechanical strength. Sufficient strength can be ensured.

〔Example〕

Embodiments 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.
A hair introduction hole area A in which ribs 2 between the ribs 1 and 1 are formed over approximately the entire length in the left and right direction, and oblique elongated holes 3 that obliquely intersect with the left and right direction on the front side and rear side of the hair introduction hole area A, respectively. Long hole area arranged in a row in the direction
B ₁ , B ₂ , a micro-pore region in which micro-pores 4 to the extent that countless hairs cannot be introduced are formed further forward of the long-hole region B ₁ on the front side and further rearward of the long-hole region B ₂ on the rear side. C ₁ , C ₂ , and these areas A,
A solid portion D is formed around B ₁ , B ₂ , C ₁ , and C ₂ .

The hair introduction hole region A performs a shaving action, and the elongated hole regions B ₁ and B ₂ perform a shaving action, especially for long hair.
Incidentally, as shown in FIG. 4, the micro-hole areas C ₁ and C ₂ have the effect of being bent uniformly when the outer cutter is attached to the electric shaver in an arched cross-section.
The aim is to increase the strength by increasing the moment of inertia of the area.

As mentioned above, the hair introduction hole area A is a substantially elliptical hair introduction hole area A ₁ which is most in contact with the skin when the hair is installed with an arched cross section and is put into use, that is, around the intersection O of the diagonal lines of the outer blade. Area A ₁ and other hair introduction hole area A ₂ surrounding the outer periphery of this area A ₁
It is divided into two parts. The thickness of the hair introduction hole region A ₁ that is in most contact with the skin is made thinner than that of the other hair introduction hole region A ₂ , and the pore size of the hair introduction hole 1 of the region A ₁ is made thinner than that of the other hair introduction hole region A ₂ . Set it larger than that.

Next, an example of a method for manufacturing an outer cutter having regions A ₁ and A ₂ having such a configuration will be described. Here, electroforming is used.

First, as shown in FIG. 2a, an electrical insulating film 11 having a pattern corresponding to the hair introduction holes 1 in the hair introduction hole area _A1 described above is formed on the surface of the conductive electroforming mold 10, and Notches 12 in each electrical insulating film 11
form. The 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 on which the electrically insulating film 11 has been formed is immersed in an electrodeposition tank (not shown) to perform primary electrodeposition, thereby depositing electrical insulation on the mother mold 10 as shown in FIG. 2b. A primary electrodeposited layer 13 having a thickness exceeding the electrically insulating film 11 is formed on the surface not covered by the film 11, that is, the conductive surface of the matrix 10.

A so-called sacrificial electrodeposition portion 14 is formed in the notch portion 13 by this primary electrodeposition tank.

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 electrodeposition layer 13, and then a second electrodeposition is performed to form the layer shown in FIG. 2c. As shown, a second electrodeposition layer 15 is formed on the surface of the first electrodeposition layer 13 to form ribs 2 between the hair introduction holes 1, 1. Also by this secondary electrodeposition, the electrodeposited portion 16 is formed on the sacrificial electrodeposition portion 14 .

Of course, the hair introduction hole area _A2 other than the hair introduction hole area _A1 is electroformed on the same matrix 10 at the same time, but it goes without saying that no sacrificial electrodeposited part is formed in the electrodeposition of this area _A2 . stomach. The shapes (patterns) of the hair introduction holes 1 and the ribs 2 are the same in both hair introduction hole areas A ₁ and A ₂ .

Finally, the mother mold 10 is pulled up from the electrodeposition bath and the second
When the secondary electrodeposited layer 15 is peeled off from the peeled surface of the primary electrodeposited layer 13, the hair introduction holes 1 are removed as shown in FIG. 2d.
and a rib 2 having a countersink 17 on the inner surface.
An outer cutter having the following is obtained. This secondary electrodeposition layer 15
When the matrix 1 is peeled off, since the sacrificial electrodeposited parts 14 and 16 are formed inside the part that will become the hair introduction hole 1,
It is left together with the primary electrodeposited layer 13 on the 0 side.

In such a case, the thickness of the hair introduction hole area _A1 should be greater than that of the other hair introduction hole area _A2 .
It becomes thinner by the amount electrodeposited on 4 and 16. Further, as the thickness becomes thinner, the pore size 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 approximately constant, and therefore, as described above, the waste electrodeposition parts 14, 16 are formed in the hair introduction hole area _A1 .
If the electrodeposition area per unit area is increased compared to that of the _other hair introduction hole area _A2 by forming _a will also become thinner. Also,
In this way, the rib 2 is
When the thickness is reduced, the aperture width w ₁ of the hair introduction hole 1 in region _A 1 becomes larger than the aperture width W ₂ of the hair introduction hole 1 in the other region A ₂ , and the aperture ratio increases. 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 for reducing the thickness of the hair introduction hole area A ₁ , instead of using the above-described method of forming sacrificial electrodeposition, the width of the rib 2 of the hair introduction hole area A ₁ may be made thicker.
It is conceivable to increase the electrodeposition area by increasing the exclusive area of the part, but in that case, although the thickness can be reduced as desired, the opening of the hair introduction hole 1 will be reduced by the amount that increases the width of the rib 2. As the width becomes narrower, the pore area ratio decreases, making it difficult to capture hair, so this cannot be said to be a preferable method.

To give an example of the specific thickness dimensions of the outer blade, the thickness t ₁ of the hair introduction hole area A ₁ is 45 to 50 microns, the thickness t ₂ of the other hair introduction hole area A ₂ is 55 to 56 microns, and the front and rear fine The thickness of the hole regions C ₁ and C ₂ is 40 to 48 microns, and the thickness of the solid portion D is 35 to 45 microns.

In addition, in order to prevent changes in mechanical strength due to sudden changes in the thickness of the boundary between hair introduction hole area A ₁ and hair introduction hole area A ₂ and to prevent poor contact with the inner blade, the hair introduction hole area is It is preferable that the thickness of the outer peripheral part of _A1 gradually approaches the thickness of the other hair introduction hole area _A2 . This is done by the electroforming method mentioned above, and this is done in the hair introduction hole area.
The opening area of _the notch 12 which becomes the sacrificial electrodeposited parts 14 and 16 on the outer periphery of A1 may be set gradually smaller as it approaches the other hair introduction hole area _A2 .

In addition to forming the hair introduction hole area _A1 into a substantially elliptical shape,
As shown in FIGS. 5a, b, c, and d, it may be formed into a cross shape, a circle shape, a rhombus shape, a square shape, or the like.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a plan view of the outer cutter, FIG.
b, c, and d are manufacturing process diagrams of the outer blade by electroforming, and Figure 3 a and b are comparisons of the thickness of the hair introduction hole areas A ₁ and A ₂ of the outer blade and the opening width of the hair introduction hole. A cross-sectional view showing,
FIG. 4 is a partial external perspective view of the electric shaver showing the state in which the outer cutters are attached. Figures 5a, b, c, and d are all plan views showing modified embodiments of the shape of the 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...rib, _A1 ...hair introduction hole area, _A2 ...other hair introduction hole area, O...intersection of outer blade diagonal line.

Claims (1)

[Claims] 1 Hair introduction hole area A around the intersection O of the outer blade diagonals ₁
The other 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.