CN104980878A - Method for manufacturing printed flexible film loudspeaker - Google Patents

Abstract

The invention provides a method for manufacturing a printed flexible film loudspeaker. A printed sounding system and a printing ink conductor are adopted, which makes a loudspeaker simple in structure, light and thin, and bendable and foldable and have the characteristics of being low in energy consumption, low in cost, and green and environment-friendly. Therefore, the application field of the loudspeaker is broadened, and the loudspeaker has extremely extensive application prospect in multiple aspects such as micro earphones, sounding books, braille books, photos, billboards, leaflets, luxury packaging and intelligent toys.

Description

A method of manufacturing a printed flexible film loudspeaker

technical field

The invention belongs to the field of loudspeaker manufacturing, in particular to a method for manufacturing a printed flexible film loudspeaker.

Background technique

Traditional loudspeakers are composed of electrical components, which restricts the simplification of their volume and structure. The production cost is high, and the source of materials is scarce. The production process has become mature, and it is urgent to seek new materials and new processes.

Contents of the invention

Aiming at the problems in the background technology, the present invention provides a method for manufacturing a printed flexible film speaker. The invention adopts the printing generating system and the printing ink wire to simplify the structure of the loudspeaker and realize the flexibility of the traditional hard electromagnetic loudspeaker. The invention realizes the printing of the flexible loudspeaker control circuit, the conductive coil and the magnetic ink layer by the printing process. Use printed magnetic ink as the magnetic layer of the speaker, and then based on the principle that there are multiple magnetic domains in the magnetic material, the magnetization enhances the magnetism, and then the magnetic ink is magnetized.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A method for manufacturing a printed flexible film loudspeaker, comprising the following contents;

Printing of wires in the sound system and control circuit in the flexible speaker.

The printing process of the sound system in the flexible speaker realized by the printing process is as follows:

The principle of the magnetic loudspeaker is to print a conductive coil and a magnetic material layer on two flexible base films, so that the film printed with a conductive coil is suspended above the film printed with a magnetic material layer, and then the surrounding of the two flexible base films It is packaged with dispensing glue and an air cavity is left between the two flexible base films, so that the energized coil drives the air cavity to vibrate and produce sound under the action of a magnetic field.

The printed conductive coil includes two ways of direct printing and indirect printing;

The direct printing is: using screen printing or offset printing to directly print the conductive ink onto the substrate—the flexible base film;

The indirect printing is: cover the aluminum layer on the flexible base film to make aluminum foil, prepare iron printing ink,

Use screen printing to print spiral conductive coils on aluminum foil, use the characteristics that iron printing ink does not react with NaOH, but aluminum reacts with NaOH, and perform chemical etching. The part that is not covered by iron printing ink quickly reacts with the aluminum layer and is covered. The aluminum layer is retained to form a coil; as the reaction progresses, the adhesion of the iron printing ink decreases, and it will automatically separate from the film to form a spiral aluminum conductive coil.

The described printing of the magnetic material layer on the flexible base film includes the following processes;

Use unmagnetized NdFeB magnetic powder, chlorinated EVA resin, and 783 mixed solvent to print on the printing equipment, and then dry: pre-prepared 10%~30% chlorinated EVA resin and 70%~90% 783 solution Mix chlorinated EVA resin liquid, and then prepare NdFeB magnetic ink containing 70%~90% NdFeB magnetic powder and 10%~30% chlorinated EVA solution, and then print on PET flexible film, and finally based on the inner magnetic material There are multiple magnetic domain principles, using strong magnets to magnetize in both horizontal and vertical directions, and magnetic material layers.

The wires in the control circuit are printed with conductive ink.

The two flexible base films are made of PET film or paper base; and the area of the film printed with the conductive coil is larger than the area of the film printed with the magnetic material layer, so as to facilitate dispensing and encapsulation.

The loudspeaker manufactured by the method of the present invention includes a power supply, a control circuit, and a generating system connected in sequence; the generating system includes two printing films, which are respectively a printing film 1 and a printing film 2, and the printing film 1 is provided with a printing method. A conductive coil formed by printing conductive ink on a film, a magnetic material layer is arranged on the printing film 2, and the magnetic material layer is located between the printing film 1 and the printing film 2 packaged together, and the size and position of the magnetic material layer are consistent with the Conductive coils correspond.

The positional relationship between the conductive coil and the flexible printing film 1 includes one of the three forms of the conductive coil above the printing film 1 or the conductive coil below the printing film 1 or the conductive coil distributed on both sides of the printing film 1 to form a double-layer connected coil. kind.

Described control circuit comprises the touch switch, light-emitting diode, music single-chip microcomputer, amplifier that are connected in sequence; Wire connection formed by conductive ink.

Compared with the prior art, the present invention adopts the printed generation system and the printed ink wire, which has the characteristics of simple structure, light and thin, bendable and foldable, low energy consumption, low cost, and environmental protection, thereby broadening the application field of the loudspeaker. Miniature earphones, audio books, Braille books, photos, billboards, leaflets, luxury packaging, smart toys and many other aspects have extremely broad application prospects.

Description of drawings

Fig. 1 is the structural diagram of the loudspeaker that the present invention makes;

Fig. 2 is the connection principle diagram of each structure of loudspeaker that the present invention makes;

Fig. 3 is the top view of the conductive coil on the printing film 1;

Fig. 4 is a diagram of the conductive coil under the printing film 1;

FIG. 5 is a coil diagram in which conductive coils are distributed on both sides of the printing film 1 to form a double-layer connection;

Among them, 1—power supply, 2—control circuit, 3—sounding system, 4—printing film 1, 5—printing film 2, 6—conductive coil, 7—magnetic material, 8—package dispensing.

Detailed ways

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

The invention adopts the printing process to realize the printing of the sounding system in the flexible speaker and the wires in the control circuit.

system.

Using the printing process to realize the printing process of the sound system in the flexible speaker is as follows: using the electromagnetic speaker

The principle of the acoustic device is to print a conductive coil and a magnetic material layer on two flexible base films, so that the film printed with a conductive coil is suspended on the film printed with a magnetic material layer, and then the surroundings of the two flexible base films are covered with Dispensing glue encapsulation and leaving an air cavity between the two flexible base films, so that the energized coil drives the air cavity to vibrate and sound under the action of the magnetic field.

Printed conductive coils include direct printing and indirect printing;

The direct printing is: using screen printing or offset printing to directly print the conductive ink onto the substrate—the flexible base film;

The indirect printing (aluminum washing) is as follows: cover the aluminum layer on the flexible base film to make aluminum foil, prepare iron printing ink, and print spiral conductive coils on the aluminum foil by screen printing, using iron printing ink that does not react with NaOH, while aluminum and The characteristics of the NaOH reaction, chemical etching, the part not covered by the iron printing ink quickly reacts with the aluminum layer, and the covered aluminum layer remains to form a coil; as the reaction progresses, the adhesion of the iron printing ink decreases, and it will automatically Break away from the film to form a helical conductive coil of aluminum.

Printing a layer of magnetic material on a flexible substrate film includes the following processes;

Use unmagnetized NdFeB magnetic powder, chlorinated EVA resin, and 783 mixed solvent to print on the printing equipment, and then dry: pre-prepared 10%~30% chlorinated EVA resin and 70%~90% 783 solution Mix chlorinated EVA resin liquid, and then prepare NdFeB magnetic ink containing 70%~90% NdFeB magnetic powder and 10%~30% chlorinated EVA solution, and then print on PET flexible film, and finally based on the inner magnetic material There are multiple magnetic domain principles, using strong magnets to magnetize in both horizontal and vertical directions, and magnetic material layers.

The wires in the control circuit are printed with conductive ink.

The two flexible base films are made of PET film or paper base; and the area of the film printed with the conductive coil is larger than the area of the film printed with the magnetic material layer, so as to facilitate dispensing and encapsulation.

The following is a detailed introduction to the speaker from the structural point of view:

1. Flexible substrate (namely: printing film 1, printing film 2): PET film, paper base and other flexible materials are used as the substrate.

2. Magnetic material: There are two kinds of materials to choose from;

(1) Use printed magnetic ink as the magnetic layer of the speaker, printed on the flexo substrate. As shown in Figure 3, 4, 5;

(2) Flexible magnetic strips made by fusing magnetic materials and auxiliary agents such as rubber.

3. Package dispensing

In the packaging design of the printed coil layer (ie: printing film 1) and the magnetic material layer (ie: printing film 2), the area of the printing film 1 is larger than the area of the printing film 2, and then the surrounding edges of the film are sealed by dispensing. An air cavity is left in the coil layer as a generating system of the loudspeaker.

4. Conductive coil

The conductive ink is printed on the surface by printing to form a conductive coil, which is used as the vibration system of the speaker. There are three positional relationships between the coil and the flexible substrate: (1) The conductive coil is above the flexible substrate, as shown in Figure 3 (2) The conductive coil is below the flexible substrate, as shown in Figure 4 (3) The conductive coil is distributed on both sides of the flexible substrate to form a double layer Connected coils, as shown in Figure 5.

5. Control circuit

The control circuit is composed of touch switches, chips, amplifiers, etc., which are connected by wires formed by printing conductive ink to form a control circuit; the chip part is packaged with flexible bump technology.

6. Flexible power module

 A flexible power supply is used to provide DC power for the entire working process of the speaker.

Flexible effect analysis:

The printed wires of the control circuit can be flexibly bent, and the chip part does not affect the bending effect of the flexible film due to its small area of less than 1 square centimeter; the printed coil is on a 38 μm thick PET flexible film, PET film printed with magnetic ink or flexible The magnetic adhesive strip acts as a magnetic material layer, making it thin and flexible, and the bending degree can reach more than 90 degrees.

The printing film adopts PET (Polyethylene terephthalate, commonly known as polyester resin) film. It is a condensation polymer of terephthalic acid and ethylene glycol, and together with PBT, it is collectively referred to as thermoplastic polyester, or saturated polyester. PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. It has good mechanical properties, the impact strength is 3~5 times that of other films, and the folding resistance is good, which effectively avoids the damage of the substrate caused by the vibration of the coil, and at the same time meets the requirements of flexibility.

Claims (6)

1. a manufacture method for printed flexible wafer speaker, is characterized in that: comprise following content;

The technique of printing is adopted to realize the printing of wire in sonification system and control circuit in flexible loud speaker.

2. the manufacture method of a kind of printed flexible wafer speaker according to claim 1, is characterized in that: the printing process that the technique that described employing is printed realizes sonification system in flexible loud speaker is as follows:

Utilize the principle of electromagnetic loudspeaker, two flexible substrates films print conductive coil and magnetic material layer respectively, on the film film being printed with conductive coil being suspended from be printed with magnetic material layer, again the surrounding point rubber seal of two flexible substrates films filled and leave air chamber between two flexible substrates films, making the coil of energising drive air chamber vibration sounding under the influence of a magnetic field.

3. the manufacture method of a kind of printed flexible wafer speaker according to claim 2, is characterized in that: described printing conductive coil comprises directly printing and indirect printing two kinds of modes;

Described direct printing is: utilized by electrically conductive ink silk screen printing or offset printing to be directly printed onto on stock-flexible substrates film;

Described indirect printing is: on flexible substrates film, overlying aluminum layer makes aluminium foil, preparation tin printing ink, adopt silk screen printing on aluminium foil, print spiral conductive coil, it does not react with NaOH to utilize tin printing ink, and the characteristic that aluminium and NaOH react, carry out chemical etching, the very fast and aluminium lamination of the part do not covered by tin printing ink reacts, capped aluminium lamination then remains, and forms coil; Along with reaction is carried out, the tackness of tin printing ink reduces, and can automatically disengage film, form spiral helicine aluminum conductive coil.

4. the manufacture method of a kind of printed flexible wafer speaker according to claim 3, is characterized in that: the described magnetic material layer that prints on flexible substrates film comprises following process;

With the NdFeB magnetic powder do not magnetized, chlorinated EVA resin, 783 mixed solvents print on printing equipment, then dry: preparation is in advance containing the mixed chlorinated EVA resin liquid of 10% ~ 30% chlorinated EVA resin and 70% ~ 90% 783 solution, preparation contains the Neodymium iron boron magnetic ink of 70% ~ 90% NdFeB magnetic powder and 10% ~ 30% chlorinated EVA solution again, then print on PET fexible film, last based on the principle having multiple magnetic domain in magnetic material, magnetize in level and vertical both direction with kicker magnet, magnetic material layer.

5. the manufacture method of a kind of printed flexible wafer speaker according to claim 4, is characterized in that: the wire in described control circuit is formed by electrically conductive ink printing.

6. the manufacture method of a kind of printed flexible wafer speaker according to claim 5, is characterized in that:

Described two panels flexible substrates film adopts PET film or paper substrate; And the area being printed with the film of conductive coil is greater than the area of the film being printed with magnetic material layer, so that some rubber seal dress.