KR101493450B1 - Edge for thin film type tv speaker using thermoplastic vulcanizate - Google Patents

Abstract

The present invention relates to an edge for a thin film type TV speaker using a thermoplastic vulcanizate, more specifically, formed of a hard segment, a soft segment, and oil. The edge for a thin film type TV speaker using a thermoplastic vulcanizate, formed of said components, shows an excellent sound characteristic even with thin thickness by having low hardness and specific gravity and high durability, and shows an effect of preventing the leakage of oil by containing oil with low molecular weight.

Description

TECHNICAL FIELD [0001] The present invention relates to an edge for a thin film type TV speaker using thermoplastic vulcanizate,

The present invention relates to a TV speaker edge using a thermoplastic vulcanizate, and more particularly, to a thin film type TV speaker edge composition comprising the above components, which has low hardness and specific gravity and is excellent in durability, , And relates to an edge for a thin film type TV speaker using a thermoplastic vulcanizate containing an oil having a low molecular weight and omitting an oil component.

The present invention relates to an edge for a TV speaker using a thermoplastic vulcanizate, and more particularly, to a thin film type TV speaker edge composition comprising the above components, which has low hardness and specific gravity and is excellent in durability, , And relates to an edge for a thin film type TV speaker using a thermoplastic vulcanizate containing an oil having a low molecular weight and omitting an oil component.

Generally speaking, a speaker is composed of a magnetic circuit formed of a yoke having a magnet and a bobbin wound around the voice coil, a vibrating plate having an inner circumferential lower portion joined to the periphery of the upper end of the bobbin of the magnetic circuit, A frame to which one end of the damper and the damper to be adjusted are fixed, and an edge to fix the edge of the upper end of the vibration plate to the frame.

The edge flexibly responds to the motion of the vibration system and the driveline part and prevents the side plate from swinging so that the position of the diaphragm can be precisely maintained. The sound waves radiated forward from the diaphragm and those radiated in the backward direction are mixed with each other, .

Since the amplitude of the diaphragm has a property inversely proportional to the square of the frequency, a large amplitude is exhibited in the low frequency range, and mechanical linearity of the vibration direction is required at the edge. Further, in order to prevent the sound generated at the edge due to the resonance from adversely affecting the performance of the speaker, a vibration absorbing ability is required, and since it is coupled to the outer periphery of the diaphragm, weight reduction is required.

Conventionally, the edge portion of the speaker is formed of latex-coated fabric, thermoplastic polyurethane and vulcanized rubber. However, latex-coated fabrics have difficulty in production quality control and change over time, leading to reliability problems. In thermoplastic polyurethane, And the shore A durometer hardness is more than 80, and the vulcanized rubber has a high specific gravity, which is heavy in weight, durable in its durability, and expensive.

An object of the present invention is to provide a thin film type TV speaker edge using a thermoplastic vulcanizate which has low hardness and specific gravity and excellent durability so that it exhibits excellent acoustic characteristics even though it is formed into a thin thickness and contains oil having a low molecular weight and does not oily .

The object of the present invention is achieved by providing an edge for a thin film type TV speaker using a thermoplastic vulcanizate, characterized in that it is made of a low-hardness TPV sheet made of hard segment, soft segment and oil.

According to a preferred aspect of the present invention, the edge of the thin film type TV speaker using the thermoplastic vulcanizate is composed of 100 parts by weight of hard segment, 50 to 100 parts by weight of soft segment and 15 to 25 parts by weight of oil.

According to a further preferred feature of the present invention, the hard segment is made of one selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride and polyester.

According to a further preferred feature of the present invention, the soft segment is made of vulcanized rubber.

According to an even more preferred feature of the present invention, the vulcanized rubber is made of vulcanizing agent in an amount of 0.01 to 0.05 part by weight based on 100 parts by weight of rubber.

According to a further preferred feature of the present invention, the oil is one selected from the group consisting of paraffinic, naphthenic and ester systems and has a weight average molecular weight of 100 to 550.

According to an even more preferred feature of the present invention, the edge of the thin film type TV speaker using the thermoplastic vulcanizate has a Shore A durometer hardness of 50 to 80. [

According to a further preferred feature of the present invention, the edge of the thin film type TV speaker using the thermoplastic vulcanizate is formed to have a thickness of 0.1 to 0.4 millimeters.

The edge of a thin film type TV speaker using the thermoplastic vulcanizate according to the present invention has a low hardness and specific gravity and is excellent in durability so that it exhibits excellent acoustic characteristics even if it is formed to have a thin thickness and contains an oil having a low molecular weight, .

In addition, it exhibits excellent light resistance and heat resistance, exhibits excellent frequency response characteristics due to its low specific gravity, has a low hardness, and exhibits an excellent low-frequency sound reproducing ability.

FIG. 1 is a graph showing a measurement result of a low-frequency sound reproduction capability of an edge for a thin-film TV speaker manufactured through Example 2 and Comparative Example 1 of the present invention.

Hereinafter, preferred embodiments of the present invention and physical properties of the respective components will be described in detail with reference to the accompanying drawings. However, the present invention is not limited thereto, And this does not mean that the technical idea and scope of the present invention are limited.

The edge of the thin film type TV speaker using the thermoplastic vulcanizate according to the present invention is composed of a hard segment, a soft segment and oil, and is preferably composed of 100 parts by weight of hard segment, 50 to 100 parts by weight of soft segment and 25 to 150 parts by weight of oil .

The hard segment serves as a main ingredient of an edge for a thin film type TV speaker using the thermoplastic vulcanizate according to the present invention and functions as a base material in which the soft segment particles are evenly dispersed.

In this case, the hard segment is preferably composed of one selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, and polyester. As described above, the synthetic resins that can form the hard segment exist in a cured form at room temperature, It can be processed into various shapes.

The soft segment is contained in an amount of 50 to 100 parts by weight and is made of vulcanized rubber. More specifically, it is preferable that 100 parts by weight of the rubber component contains 0.01 to 0.05 parts by weight of a vulcanizing agent.

In this case, the rubber component is not particularly limited as long as it can be processed into vulcanized rubber by containing a vulcanizing agent as described above. Any rubber component can be used, but natural rubber or synthetic rubber such as EPDM, SBR, BR and NBR is used .

As described above, the soft segment made of the vulcanized rubber has a particle size of 0.01 to 0.1 millimeter and is uniformly dispersed in the hard segment.

If the above soft segments are evenly dispersed, they exhibit excellent elasticity and flexibility due to the rubber component at room temperature, and they can be processed into various shapes because they show thermoplasticity due to the plastic components of the hard segment when heated.

In addition, when the soft segment is contained, it is possible to provide a thin film type TV speaker edge having excellent light resistance and heat resistance, low specific gravity, excellent response to frequency, and low hardness.

When the soft segment is mixed with the hard segment, it is preferable to mix the soft segment using a dynamic vulcanization method using a mixer having a high shear rate such as a two-axis kneading extruder.

As the vulcanizing agent, a peroxide-based vulcanizing agent is used, and the peroxide-based vulcanizing agent is not particularly limited, but DCP (Dicumyl peroxide) is preferably used.

The oil is contained in an amount of 15 to 25 parts by weight, and serves to improve the mixing property of the hard segment and the soft segment, thereby providing a composition for a thin film type TV speaker edge that exhibits uniform physical properties.

Further, the oil serves to lower the hardness of the composition for a thin film type TV speaker edge according to the present invention.

The oil is preferably one selected from the group consisting of paraffin oil, naphthene oil, and ester oil. Preferably, the oil has a weight average molecular weight of 100 to 550. When the oil content is less than 15 parts by weight, And the effect of lowering the hardness is insignificant. If the content of the oil exceeds 25 parts by weight, the oil component may escape during the molding process.

Generally, when producing a speaker edge, a polymer type oil having a weight average molecular weight of 1000 or more is used. However, since an oil component having a weight average molecular weight of 1000 or more has a high viscosity, an excessive amount of oil has to be added in order to improve the mixing property and lower the hardness, In the present invention, since the weight average molecular weight is low and the viscosity is low, it is possible to improve the mixing property and decrease the hardness even with a small amount of the oil component have.

When the weight average molecular weight of the oil is less than 100, the viscosity is too low to exhibit the mixing property and hardness lowering effect of the oil component. When the weight average molecular weight of the oil exceeds 550, the viscosity is excessively increased, And the oil component is infiltrated during the molding process to deteriorate the workability, and the quality of the product may be deteriorated.

The hard segment, soft segment, and oil mixture is formed into a thin film type TV speaker edge through a molding process such as compression molding or injection molding, and is formed to have a thickness of 0.1 to 0.4 mm. As described above, The mixture of the segment and the oil has a low hardness and specific gravity and is excellent in durability, so that it exhibits excellent acoustic characteristics even when formed into a thin thickness as described above.

As described above, the thin film type TV speaker edge using the thermoplastic vulcanizate produced from the composition of the hard segment, the soft segment and the oil has the soft segment made of the vulcanized rubber and the oil component having the low weight average molecular weight, And a hardness of 50 to 80.

Hereinafter, physical properties of an edge for a thin film type TV speaker using the thermoplastic vulcanizate according to the present invention will be described with reference to examples.

≪ Example 1 >

50 parts by weight of polyethylene as a vulcanized rubber (prepared by mixing 0.03 part by weight of DCP vulcanizing agent in 100 parts by weight of SBR rubber) and 20 parts by weight of paraffin oil (molecular weight: about 100) were vacuum-molded into 100 parts by weight of 0.2 mm A thin film type TV speaker edge using a thermoplastic vulcanizate as a base material was prepared.

≪ Example 2 >

75 parts by weight of vulcanized rubber (prepared by mixing 0.03 parts by weight of DCP vulcanizing agent in 100 parts by weight of SBR rubber) and 20 parts by weight of paraffin oil (weight average molecular weight: about 300) were vacuum-molded into 100 parts by weight of polyethylene to give a thickness of 0.2 Edge of a thin film TV speaker using a millimeter thermoplastic vulcanizate.

≪ Example 3 >

A mixture of 100 parts by weight of polyethylene and 100 parts by weight of vulcanized rubber (prepared by mixing 0.03 part by weight of DCP vulcanizing agent in 100 parts by weight of SBR rubber) and 20 parts by weight of paraffin oil (weight average molecular weight of about 550) Edge of a thin film TV speaker using a millimeter thermoplastic vulcanizate.

≪ Comparative Example 1 &

A mixture of 50 parts by weight of polyurethane and 20 parts by weight of paraffin oil (molecular weight: about 300) was vacuum-molded into 100 parts by weight of polyethylene to prepare an edge for a thin film TV speaker having a thickness of 0.2 millimeter.

The hardness of the edge for a thin film type TV speaker manufactured through Examples 1 to 3 and Comparative Example 1 was measured and is shown in Table 1 below.

(However, the hardness was measured using a D-type durometer hardness meter.)

<Table 1>

As shown in Table 1 above, it can be seen that the edge for a thin film type TV speaker using the thermoplastic vulcanizate produced through Examples 1 to 3 of the present invention has a hardness of 80 or less, which is very low.

The specific gravity and the heat distortion temperature of the edge for a thin film type TV speaker manufactured through Example 2 and Comparative Example 1 were measured and are shown in Table 2 below.

(However, the specific gravity was measured by using a specific gravity meter and measured with a thermal deformation temperature thermal deformation temperature measuring apparatus.)

<Table 2>

As shown in Table 2, the edge of the thin film type TV speaker using the thermoplastic vulcanizate produced through Example 2 of the present invention has a lower specific gravity and a higher heat distortion temperature than the edge of the thin film type TV speaker manufactured in Comparative Example 1 .

In addition, the low-frequency sound reproducing ability of the edge for a thin film type TV speaker manufactured through Example 2 and Comparative Example 1 was measured and is shown in FIG. 1

As shown in FIG. 1, a speaker using an edge for a thin film type TV speaker using the thermoplastic vulcanizate manufactured through Example 2 of the present invention exhibits a minimum resonance frequency fo at an early stage of 200 Hz, In the case of a speaker using an edge for a thin film type TV speaker, the lowest resonance frequency appears near 300 Hz.

Accordingly, the edge of the thin film type TV speaker using the thermoplastic vulcanizate prepared in Examples 1 to 3 has low specific gravity and excellent durability so that it exhibits excellent acoustic characteristics even when formed into a thin thickness, It does not come out.

Claims (8)

And a low-hardness TPV sheet composed of 100 parts by weight of hard segment, 50 to 100 parts by weight of soft segment and 15 to 25 parts by weight of oil.
The method according to claim 1,
Wherein the hard segment comprises one selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, and polyester. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
The method according to claim 1,
Wherein the soft segment is made of vulcanized rubber. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
The method of claim 3,
Wherein the vulcanized rubber comprises 0.01 to 0.05 parts by weight of a vulcanizing agent in 100 parts by weight of rubber.
The method according to claim 1,
Wherein the oil is one selected from the group consisting of paraffinic, naphthenic and esters, and has a weight average molecular weight of 100 to 550. The edge of the thin film type TV speaker using the thermoplastic vulcanizate.
The method according to any one of claims 1 to 5,
Wherein the edge of the thin film type TV speaker using the thermoplastic vulcanizate has a Shore A durometer hardness of 50 to 80. The edge of the thin film type TV speaker using the thermoplastic vulcanizate.
The method according to any one of claims 1 to 5,
Wherein the edge of the thin film type TV speaker using the thermoplastic vulcanizate has a thickness of 0.1 to 0.4 millimeters. delete

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