JPS6076795A - Manufacture of diaphragm - 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 The present invention relates to a method for manufacturing a diaphragm, and in particular to a method for manufacturing a diaphragm, particularly for the production of diaphragms for musical instruments equipped with a large number of reeds, such as a harmonica or a diaphragm.
This invention relates to a method for manufacturing an I-plate.

In recent years, harmonicas and pianicas have been widely used as music teaching materials in elementary schools, and the demand for them has been increasing.
The diaphragm of the musical instrument is comprised of a frame 1 and a number of reeds 2 attached to the frame IK, as shown in FIG. 1F and H11. Each reed 2 has a face whose length changes depending on the note of the scale.

A large number of slits 3 whose lengths change according to the lengths of the leads 2 are formed in the frame 1.
are attached to the plate so as to close the openings of the corresponding slits 3.

Note that the dimensions of the lead are slightly smaller than those of the slit, and therefore a predetermined distance is provided between the lead 2 and the periphery of the slit 30.

In order to create such a diaphragm, the plate and leads are made separately by pressing a metal plate, and then one end of each lead is attached to the grate by bolting or slit welding. It was built like an ill. However, according to this method, extremely high precision positioning is required when attaching the leads to the 70 rate, and the positioning is performed manually, which requires a great deal of labor.

The present invention was made under these circumstances, and an object of the present invention is to provide a method for manufacturing a diaphragm that enables significant labor savings and cost reductions compared to conventional methods.

In order to achieve the above object, the diaphragm manufacturing method of the present invention includes a lead tip row on the front surface of the metal plate, a portion corresponding to "8" of the lead contact pores located a predetermined distance ahead of the lead tip row, and a lead row on the back surface of the metal plate. a step of forming a first Lenost film or turn in a region excluding a portion corresponding to a slit row corresponding to
a step of etching the metal plate by a predetermined amount using the first resist film pattern as a mask, etching a second layer on the portion corresponding to the lead main body row between the etched tip of each lead and each of the J connection portions; forming a resist film pattern; further etching the metal plate using the first and second resist film patterns as masks to form a slit row penetrating from the back surface of the metal plate to the peripheral portion of each lead on the front surface; , and the first and second lenost n
t; Consists of a step of removing the pattern.

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment FIGS. 2(a) to 2(6) show the manufacturing process of a harmonica diaphragm by the method of the present invention. First, as shown in FIG. 2(a), the thickness is 1.23 scale and the width is (3,7) cm.

Resist film patterns 12a and 12b were formed on the front surface of a brass plate 11 having a length of (1, 8, 1)' cm, and a resist film pattern 13 was formed on the back surface. The front view of FIG. 2(a) is shown in FIG. 3(a), and the back view is shown in FIG. 3(b). The resist film pattern 12a on the surface corresponds to a portion corresponding to the tip of the lead, and the pattern 121) corresponds to a portion corresponding to the connection portion of the lead. Further, the resist 1 and turn 13 on the back side are formed in a round shape on the thinly cut portions other than the portions 14 corresponding to the slits.

This resist 11°i pattern was obtained by applying a photoresist film to the screen of the brass plate 11, exposing it to a predetermined main turn, developing it, and baking it. As shown in FIG. 2(b), such a resist 11 has a convex turn I 2 a, 121), 73
Using this as a mask, both sides of the T6 button plate 11 were etched.

Is this etching 45° as an etching solution? -I immersion etching using a ferric chloride solution with a medium concentration;
Etching was stopped when a predetermined etching depth was reached. In addition,
As a result of such immersion etching, side etching progressed, and as shown in FIG. In order to form this overhang shape more neatly, it is also possible to add a fluorine-containing surfactant to the etching solution to add 1) to the surface-etching process.

Next, as shown in m 2 M (c) K, the part corresponding to the lead outer body between the flat turns 12 rr and 12 b (30th (c) ] K L-cyst ll:'l pattern 16 was formed.
t: Screen mark λ5+1 using ink, and (
・Magazine ii", I/Dust n'~] and turn I28,
121), which is the same as I3 (・6) and is formed by panning Custrog; and 42
As shown in 1 and + ('), a second etching was performed using the f-turns r 2a , Z 2b , J , 9 , and 76 of the cis 1' film as a mask. This etching solution t i' was carried out until the western part a was completely etched. Etching methods include the spl/- etching method with less double etching, the p-ladderless etching method, the two-step etching method in which the resist It. By using this, it is possible to achieve a high dimension Jf'f degree.

,:,,4. Later, Renost membrane No. 4 turns 12a, 12
b.

1.9 and 16 were removed to obtain a harmonica diaphragm as shown in FIG. 2(e).

That is, the vibration of the no-monica shown in FIG.
It is composed of a plate 21 and a number of boards 22 integrally formed on the plate 21. plate 21
has a large number of slits 23 at positions corresponding to the leads 22.
are provided, and one end of each lead 22 is connected to the plate 21 so as to close these slits 23. Note that there is a 001 mark between the peripheral edge of the lead 22 and the opening of the slit 230F'f1, excluding the connection part with the plate 2.
A gap a of about 0.11 is provided.

As explained above, according to the method of the present invention, a diaphragm can be integrally obtained from a single metal plate using two-step etching. There is no need for alignment or attachment to the plate, making it possible to significantly save labor and reduce costs compared to conventional methods.

Although the diaphragm of a musical instrument with multiple reeds such as a harmonica has been described above, the present invention is not necessarily limited thereto.
It is also applicable to the manufacture of diaphragms having what corresponds to a large number of leads.

[Brief explanation of the drawing]

FIG. 1 (al) is a partial plan view and a cross-sectional view of a normal harmonica diaphragm, and FIG. Figure, and the third l171 (al (b) is the second
FIG. 3 is a top view and a back view of the structure shown in FIG. 1.2...plate, 2,22...lead, 3゜2,? ...Slit, 7 J-f:: Copper 4J, z
, 12a, 12b. 13, 16...Regis) ll /4' turn. Applicant's agent Patent attorney Takehiko Suzue Figure 1 (a) Δ (b) Figure 2

Claims (1)

[Claims] A first resist film pattern is formed in an area excluding the lead tip row on the front surface of the metal plate and a portion corresponding to a lead connection portion located a predetermined distance ahead of the lead end row, and a portion corresponding to a slit row corresponding to the lead row on the back side of the metal plate. a step of etching the metal plate by a predetermined amount using the first resist film pattern as a mask; a step of etching the metal plate by a predetermined amount using the first resist film pattern as a mask; forming a second resist film/arm turn; using the first and second resist film patterns as masks, the metal plate is further etched to form a row of slits penetrating from the back surface of the metal plate to the local parts of each lead on the front surface; a plate having a large number of slits, and one end of which is integrally connected to the plate so as to close the slits, the plate having a plurality of slits, and one end thereof being integrally connected to the plate so as to close the slits. A method for manufacturing a diaphragm consisting of a slit and a large number of small-sized leads.