JPS63145691A - Production of thin plate-shaped substrate - 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 Application Field] The present invention relates to a method for producing a thin plate-like substrate having a large number of small holes in the rib portion, such as the outer blade of an electric shaver, by electrodeposition. .

[Conventional technology and problems to be solved]

For example, in the outer blade of a reciprocating electric shaver, the thin plate-like substrate uses not only round holes as hair introduction holes but also slits rather than round holes to effectively capture long hair and other lying hair. It is desirable to provide large elongated pores.

By the way, this type of thin plate-like substrate is generally formed by electrodeposition, but according to the electrodeposition method, the electrodeposited layer tends to adhere in an equal amount per unit area on the main surface of the matrix. be. That is,
When the above-mentioned structure having small holes of different sizes is formed by electrodeposition, the thickness of the electrodeposited ribs between the large holes such as slits becomes thicker than the rib portions between the small holes. For this reason,
When the outer cutter holder is stretched in an arched shape, the part with the large small hole and the part with the small hole will be stretched with different degrees of bending, and the inner cutter will be stretched in a different manner. It does not hit the cutting edge evenly, leading to chipping and uneven wear of the cutting edge.

In addition, in order to make the part that makes the most contact with the skin, such as the center part of the outer blade, thinner to enable a close shave, there is a gap between the outer blade's thick peripheral part, which requires mechanical strength for tensioning. However, with conventional manufacturing methods, it is not possible to adjust the thickness arbitrarily, and the thickness is generally adjusted by adjusting the hole shape and the pitch between the holes as described above. Therefore, the shape of the small holes to be laid out in the central part and the peripheral part is uniquely determined, which restricts the degree of freedom in design.

[Means for solving problems]

The present invention has been made in view of the above-mentioned points, and when forming a thin plate-like substrate having a large number of small holes partitioned by rib portions by an electrodeposition method, a conductive material is formed corresponding to each small hole. An electrically insulating thin film is formed on the main surface of the mother mold, and a notch is provided in the thin film to expose the main surface of the conductive mother mold. By adjusting the coating thickness, even if the same small holes are laid out over the entire surface of a thin plate-like substrate, the lip thickness between the small holes, that is, the substrate thickness, can be partially changed, making it possible to improve the design. This method is advantageous in terms of manufacturing, as it can increase the degree of freedom and can be carried out using well-known electrodeposition manufacturing equipment and in the same manufacturing process as conventional methods.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking the outer blade of an electric shaver as an example.

FIG. 1 shows the outer blade of a reciprocating electric shaver obtained by the manufacturing method of the present invention. In the figure, 1 is a flexible thin plate base, and 2 is a slit formed in the thin plate base 1. A hair introduction small hole having a relatively large opening area such as 3
2 is a small hair introduction hole having a relatively small opening area, such as a round hole formed in the base body 1, and these small holes 2 and 3 are partitioned into a large number by rib portions and arranged in close positional relation to each other. It is set up. 4.4 is a reinforcing plate made of synthetic resin or thin steel plate formed along both side edges of the base body 1, and 5 is a mounting piece for attaching to an outer cutter holder (not shown).

Next, the method for manufacturing the thin plate-like substrate described above will be explained step by step.

First, as shown in FIG. 2, an electrically insulating thin film 22.23 is formed on the main surface of the conductive matrix 21 at a portion corresponding to the aforementioned small hole 2.3, and each of these films is thin film 2
2.23, an isolated notch 24.25 is formed as shown in Fig. 3, and the notch 24.25 portion is the main surface (conductive part) of the matrix.
is exposed. The surface area of these notches 24 and 25 is
The size is set in proportion to the opening area of the above-mentioned hair introduction small hole 2.3, and by setting it in this way, the electrodeposition thickness per unit area can be made equal. The above-mentioned film 22 and 23 are cured by known means, that is, by light.

After uniformly coating the main surface of the mother mold 21 with a photosensitive resin that is insoluble and has chemical resistance and electrical insulation properties,
A positive printing board is closely attached to this, and then printing and processing are performed.Alternatively, a photosensitive resin is printed and processing is carried out using a negative printing board, and then the main surface of the matrix 21 is etched. The resin is oxidized, the baked resin is removed, and an oxide film is applied to the portions corresponding to the small holes 2.

The matrix 21 with the thin film 22.23 formed thereon is immersed in an electrodeposition bath (not shown) to perform a first molding process, and the conductive surface of the matrix 21 is coated with a first film that exceeds the thickness of the thin film 22,23. Spray adhesion layer 2
6 (Figure 4).

Due to this first molding, unnecessary electrodeposited layers 27 and 28 are also formed in the notched portions 24 and 25 as so-called sacrificial electrodeposited portions.
Here, since the electrodeposited layer is deposited in an approximately equal amount per unit area, the electrodeposited layer that is about to be deposited on the rib part between the adjacent small holes 2.3 is deposited on the notches 24 and 25. The ribs are also electrodeposited in a dispersed manner, which allows the thickness of the rib portion to be controlled.

Next, the matrix 21 is immersed in an aqueous solution of potassium dichromate or the like to perform a peeling treatment, and then a second molding process is performed to form the surface ml of the first blow molding layer 26 as shown in FIG. A second molded layer 29 having a required thickness is formed as the base 1 in this manner. Also by this second molding, the electrodeposited layer 27
．． A sacrificial electrodeposited layer 30, 31 is formed on 28 to control the amount of deposition on the lip portion.

After the second spray deposition, if the mother mold 21 is pulled up from the electrodeposition tank and the second spray deposition layer 29 is peeled off from the peeling-treated surface,
As shown in FIG. 6, the second molded layer 29 constitutes a rib portion between the small holes 2.3, and an outer cutter having a countersink portion 32 is obtained.

When the second molded layer 29 is peeled off, the unnecessary electrodeposited layers 27.30 and 28.31 are removed from the small holes 2, respectively.
．． Because it is isolated at the part corresponding to 3, the above matrix 2
left on the 1st side.

Here, prior to electrodeposition, if cutouts 24 and 25 are formed in isolation in the electrically insulating thin film 22 and 23, each having an area proportional to the size of the small hole 2.3, small and small holes of different sizes can be formed. The electrodeposited thickness of the rib portions 33 and 34 of 2 and 3 is 1. ．． 1 = is
The so-called sacrificial electrodeposited layer 30.31 adjusts and almost equalizes the blade, so even when the outer cutter is curved and stretched on the outer cutter holder, the degree of bending becomes even, preventing uneven wear and damage. It is possible to avoid such risks. Of course, since electrodeposition tends to deposit in an equal amount per unit area, the notches 23, 2
If 4 is not provided, the rib portion will be thicker and the notch 23 will be thicker.
, 24, the thickness of the rib portion becomes thinner. In this way, the thickness of the rib portion can be freely adjusted depending on the area of the notches 23 and 24.

In the above example, the small holes 2゜3 of different sizes are limited to two types, elongated small holes and round small holes, but three or more types of different sizes are used. Even in blades with hair introduction holes or blades in which the hole area gradually increases or decreases over the entire surface of the outer blade from the center toward the outer periphery, the area of the notch 24°25 allows the rib portion to be The wall thickness, that is, the wall thickness of the thin plate-like base body can be adjusted as desired, and the thickness of the base body can be partially changed and adjusted depending on where on the whole base body the notches 24 and 25 are provided.

〔effect〕

As described above, according to the present invention, when forming the thin plate-like substrate 1 having a large number of small holes 2.3 partitioned by rib portions by electrodeposition, the holes corresponding to each of the small holes 2.3 are formed by electrodeposition. An electrically insulating thin film 22.23 is formed on the main surface of the conductive matrix 21, and cutouts 24, 25 are provided in the thin film 22.23 to expose the main surface of the conductive matrix 21. Part 24,
Since it is manufactured by adjusting the electrodeposited thickness of the rib portion between the small holes 2.3 depending on the size of the area of the thin plate substrate 1, the thickness of the thin plate-like substrate 1 can be made equal throughout regardless of the shape of the hole. Even if the temporary hole shape is the same throughout, the wall thickness can be partially changed in size, and the hole layout and wall thickness of the thin plate-like substrate 1 can be freely adjusted, providing a high degree of freedom in design. can be increased.

Moreover, according to the manufacturing method of the present invention, the notch for adjusting the wall thickness can be provided by a well-known method, and the electrodeposition manufacturing process can be used as is, so there is no need to invest in new processes or equipment. It can be made more efficient without having to do so.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an outer cutter obtained by a manufacturing method according to an embodiment of the present invention, and FIGS. 2 to 6 are sectional views showing an example of a method of manufacturing the same outer cutter. . 1... Thin plate-like substrate 2.3... Small hole 21... Conductive matrix 22, 23... Electrically insulating thin film 24, 25... Notch.

Claims (1)

[Claims] (1) When forming the thin plate-like substrate 1 having a large number of small holes 2 and 3 divided by rib portions by electrodeposition, the main part of the conductive matrix 21 is formed corresponding to each of the small holes 2 and 3. While forming electrically insulating thin films 22, 23 on the surface, the thin films 22,
Notches 24 and 2 in which the main surface of the conductive matrix 21 is exposed at 23
5, and the thickness of the electrodeposition of the rib portion between the small holes 2 and 3 is adjusted by adjusting the area of the notches 24 and 25.