CN113840220A - Carbon nanotube film heap speaker - Google Patents

Abstract

The invention provides a multilayer carbon nanotube film stack type loudspeaker, which comprises a first electrode and a second electrode, wherein the first electrode and the second electrode are arranged on a substrate, the second electrode is separated from the first electrode by a certain distance, and a sounding element is electrically connected with the first electrode and the second electrode, and the loudspeaker is characterized in that: the first electrode and the second electrode respectively clamp the sounding element, the spacing element is arranged between the substrate and the sounding element, the carbon nanotube film is composed of end-to-end carbon nanotubes which are arranged in the same direction, metal electrodes are connected to two ends of the carbon nanotube film and fixed on the outer frame, the metal electrodes on the same side are connected to the same lead, the metal electrodes connected with the carbon nanotube films on all layers cannot contact with each other, the loudspeaker further comprises the outer frame, multiple layers of carbon nanotube films which are parallel to each other and connected in parallel, and the carbon nanotube films serve as the sounding element, so that the loudspeaker with higher sounding efficiency is obtained.

Description

Carbon nanotube film heap speaker

Technical Field

The present invention relates to a signal generation system. In particular, the invention finds application in the field of acoustic transducer (transducer) systems.

Background

The sound generating device generally comprises a signal input device and a sound generating element, and a signal is input to the sound generating element through the signal input device so as to generate sound. The loudspeaker is a transducer for converting an electric signal into an acoustic signal, is the most important component in sound, and the quality of the performance of the loudspeaker directly influences the quality of the sound. In modern society, speakers are playing an indispensable role, and particularly, as the living standard of people increases, the demand for high-quality audio is increasingly prominent.

The acoustic signal is typically generated by moving a diaphragm that causes pressure vibrations that result in acoustic wave propagation. Speakers and speaker systems are often integrated into a variety of electronic devices and may be constructed in different configurations to generate sound waves in the audio frequency band frequency range.

Some types of speaker components (acoustic transducers) utilize piezoelectric materials that generate mechanical movement in response to an electric field applied across the material. Many piezoelectric materials can provide mechanical movement at frequencies corresponding to acoustic frequencies (and other frequency ranges) and can be used to generate acoustic signals in the audio frequency band and/or ultrasonic range. The carbon nanotube film can be obtained by growth in a laboratory, and the carbon nanotube film is used as a loudspeaker, so that the use of a magnet in the traditional loudspeaker can be avoided, and the manufacturing cost is greatly reduced.

Under the power-on condition, the film generates heat and sounds uniformly on the whole, and sound pressure generated by all parts has the same amplitude and phase. In addition, the heat transfer from the film to the medium is simultaneously carried out on the front side and the rear side of the film, and the generated sound waves are consistent on the front side and the rear side without arranging intervals. The membrane does not vibrate to avoid resonance, so the carbon nanotube membrane can generate audio frequency in the whole audible sound range. The carbon nanotube film has the characteristics of portability, extensibility, flexibility, transparency and the like, but the current carbon nanotube film loudspeaker has low sound production efficiency.

Disclosure of Invention

The present invention is directed to solving at least one of the above problems.

The utility model provides a multilayer carbon nanotube film stack formula speaker, includes first electrode and second electrode, and it sets up in basement, this first electrode certain distance of second electrode interval, and sound generating element is connected its characterized in that with first electrode and second electrode electricity: the sounding element is clamped by the first electrode and the second electrode respectively, the spacing element is arranged between the substrate and the sounding element, the carbon nanotube film is composed of carbon nanotubes which are arranged in the same direction and are connected end to end, metal electrodes are connected to two ends of the carbon nanotube film and fixed on the outer frame, the metal electrodes on the same side are connected to the same lead, the metal electrodes connected with the carbon nanotube films on all layers cannot be in contact with each other, the sounding element further comprises the outer frame and multiple layers of carbon nanotube films which are parallel to each other and connected in parallel, and the carbon nanotube films serve as the sounding element.

More preferably, the sound generating element includes a carbon nanotube structure, and the carbon nanotube structure includes at least one carbon nanotube film, one carbon nanotube wire or a composite structure of the carbon nanotube film and the carbon nanotube wire.

More preferably, the spacer element and the substrate may be separate components.

More preferably, the stacked multilayer carbon nanotube film speaker according to claim 3, wherein the carbon nanotubes in the carbon nanotube film are aligned in a direction parallel to the surface of the carbon nanotube film, and the carbon nanotubes are bonded to each other by van der Waals forces.

More preferably, the connection between the metal electrode and the carbon nanotube film is realized by adopting a mode of adhesive connection or directly coating the metal electrode,

more preferably, the connecting position of the electrode and the carbon nanotube film is at the head end and the tail end of the carbon nanotube arrangement direction.

More preferably, the first electrode and the second electrode are arranged in parallel on the substrate, the first electrode and the second electrode are in a shape of layer, rod, strip or block, the carbon nanotube in the carbon nanotube film is one or more of a single-walled carbon nanotube, a double-walled carbon nanotube and a multi-walled carbon nanotube, the sounding element is arranged on the spacing element, two opposite sides of the sounding element are clamped by the first electrode and the second electrode, wherein the diameter of the single-walled carbon nanotube is from nanometer to nanometer, the diameter of the double-walled carbon nanotube is from nanometer to nanometer, and the outer frame is made of an insulating material with higher rigidity.

More preferably, when the spacer element is a conductive material, it is electrically insulated from the first and second electrodes.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, reference is made to the following description taken in conjunction with the accompanying drawings

The present invention will be described in further detail with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A multilayer carbon nanotube film stack type loudspeaker based on a thermoacoustic effect comprises a first electrode and a second electrode, wherein the first electrode and the second electrode are arranged on a substrate, the second electrode is arranged at a certain distance away from the first electrode, a sounding element is electrically connected with the first electrode and the second electrode, the first electrode and the second electrode respectively clamp the sounding element, a spacing element is arranged between the substrate and the sounding element, the carbon nanotube film is composed of carbon nanotubes which are arranged in the same direction and are connected end to end, metal electrodes are connected to two ends of the carbon nanotube film, the metal electrodes are fixed on an outer frame, the metal electrodes on the same side are connected to the same lead, the metal electrodes connected with the carbon nanotube films on all layers cannot be in contact with each other, the loudspeaker further comprises an outer frame, the carbon nanotube films which are parallel to each other and are connected in parallel, and the carbon nanotube films serve as the sounding element.

The substrate mainly plays a role in bearing the first electrode, the second electrode and the spacing element, the sounding element comprises a carbon nano tube structure, and the carbon nano tube structure comprises at least one carbon nano tube film, one carbon nano tube wire or a composite structure of the carbon nano tube film and the carbon nano tube wire. The shape and size of the substrate are not limited, and the material is an insulating material or a material with poor conductivity. In addition, the material of the substrate should have good heat insulation performance, so that the heat generated by the sound generating element is prevented from being absorbed by the substrate and the purpose of heating the surrounding medium and then generating sound cannot be achieved, the electric signal is conducted to the carbon nano tube film through the metal electrode, and the film receives the electric signal and generates corresponding sound waves. The sound generating element generates corresponding temperature change according to the accessed audio signal, so that the surrounding medium is rapidly expanded and contracted, and sound waves are generated.

The spacing element and the substrate can be separate parts and are fixed on the substrate in a bolt connection or adhesive bonding mode, the spacing between two adjacent layers of the multilayer carbon nanotube film sounding element is millimeter, and the spacing between the two outermost layers is not more than millimeter; the thickness of each layer of carbon nanotube film is from nanometer to micrometer.

The arrangement direction of the carbon nanotubes in the carbon nanotube film is parallel to the surface of the carbon nanotube film, and the carbon nanotubes are connected together by van der Waals force.

The connection between the metal electrode and the carbon nano tube film adopts a mode of adhesive connection or direct coating of the metal electrode,

the connecting position of the electrode and the carbon nano tube film is at the head end and the tail end of the carbon nano tube arrangement direction.

The metal electrode is connected with the outer frame by adopting adhesive to form fixed connection, and the connected carbon nanotube film is stretched.

The first electrode and the second electrode are arranged on the substrate in parallel. The first electrode and the second electrode are in a layered shape, a rod shape, a strip shape and a block shape, the carbon nano tube in the carbon nano tube film is one or more of a single-wall carbon nano tube, a double-wall carbon nano tube and a multi-wall carbon nano tube, the sounding element is arranged on the spacing element, and two opposite sides of the sounding element are clamped by the first electrode and the second electrode, wherein the diameter of the single-wall carbon nano tube is from nanometer to nanometer, the diameter of the double-wall carbon nano tube is from nanometer to nanometer, and the outer frame is made of an insulating material with higher rigidity, such as monocrystalline silicon, hard insulating plastic or ceramic.

In this embodiment, the material of the spacer is not limited, and may be an insulating material such as glass, ceramic, or resin, or may be a conductive material such as metal, alloy, or indium tin oxide. When the spacer is made of a conductive material, the spacer is electrically insulated from the first electrode and the second electrode. The height of the spacer elements is not limited, and preferably ranges from micrometers to centimeters, and in this embodiment, the height of the spacer elements is micrometers. The spacing element is filamentary silver formed by a screen printing process. Because the spacing elements are formed on the substrate by adopting a screen printing method, the spacing elements can be directly fixed on the substrate without other connection modes.

The first electrode and the second electrode are arranged on the substrate in parallel. The first electrode and the second electrode can be in a layered (wire-shaped or strip-shaped), rod-shaped, strip-shaped, block-shaped or other shapes, and the cross section of the first electrode and the second electrode is in a circular, square, trapezoid, triangle or irregular pattern. In order to prevent the heat of the sound generating element from being absorbed by the first and second electrodes too much to affect the sound generating effect, the contact area between the first and second electrodes and the sound generating element is preferably small, and therefore the shape of the first and second electrodes is preferably a wire or a belt. The materials of the first electrode and the second electrode can be selected from metal, conductive adhesive, conductive paste, Indium Tin Oxide (ITO) and the like.

The sounding element is arranged on the spacing element, and two opposite sides of the sounding element are clamped by the first electrode and the second electrode. The spacing element is arranged at a distance from the substrate, and a space is formed between the spacing element and the substrate, so that effective sound production is provided, and the space is defined by the electrode or the spacing element. Further, in order to eliminate the standing wave generated by the sound generating element and maintain the good sound generating effect of the sound generating element, the distance between the sound generating element and the substrate is preferably micrometer to. In this embodiment, the first electrode and the second electrode are also formed on the substrate by screen printing. After the step of forming the spacing element, a filiform silver paste layer is printed on the substrate to form a first electrode and a second electrode. When the silver paste is kept in a paste state, namely is not cured, the sounding element is arranged on the paste, at least part of the sounding element is embedded or soaked in the paste, then the paste is dried under a certain condition, and after the paste is fixed, the sounding element is embedded and clamped in the formed first electrode and the second electrode.

Because the sounding element is clamped in the first electrode and the second electrode, the sounding element is firmly combined with the first electrode and the second electrode and can be fully and electrically connected with the first electrode and the second electrode, and the sounding effect of the sounding device is improved.

It can be understood that first electrode and second electrode also have certain supporting role to sound generating component, but when the distance between adjacent first electrode and second electrode is great, it is not good to sound generating component's supporting effect, set up spacing component between adjacent first electrode and second electrode, can play the effect of better support sound generating component, make sound generating component and basement interval set up and form a space with the basement to guarantee that sound generating component has good sound generating effect.

The two-layer carbon nanotube film loudspeaker structure comprises an outer frame, two first electrodes, two second electrodes, a first sound-generating element and a second sound-generating element, wherein the two sides of the sound-generating element are respectively connected with one first electrode and one second electrode, and the two sides of the sound-generating element are respectively connected with one first electrode and one second electrode. The first electrodes and the second electrodes are fixedly connected to the outer frame respectively, the two first electrodes and the two second electrodes are not in contact with each other, and the connected sound generating element are parallel and are spaced by millimeters. The two first electrodes are electrically connected through a lead A, the two second electrodes are electrically connected through a lead B, and the sound generating element are in parallel connection. The audio signal is transmitted to the sound generating element and the sound generating element through the conducting wire A and the conducting wire B, and then sound waves are generated.

The sounding element and the sounding element are carbon nanotube films, the carbon nanotube films are formed by carbon nanotubes which are arranged in a super-sequential mode and are connected end to end, the carbon nanotubes are arranged together through van der Waals force, and the sounding element are micron in thickness. The carbon nanotubes in the carbon nanotube film are double-walled carbon nanotubes. The first electrode and the second electrode are made of conductive metal, the specific shape and the material are not limited, and the first electrode and the second electrode can be prepared according to the actual process and the shape requirement. The lengths and the widths of the sounding element and the sounding element are not limited, and the sounding element can be prepared according to actual requirements.

In the embodiment of the invention, the sounding element and the sounding element are in centimeter length, centimeter width and nanometer thickness, the first electrode and the second electrode are made of copper sheets, the joint of the copper sheets and the carbon nanotube film is wetted by methanol, and then the copper sheets and the carbon nanotube film are quickly dried to connect the sounding element and the electrodes. The outer frame is made of hard insulating plastic, and the copper sheet is adhered to the outer frame by glue. The sounding element and the sounding element are in parallel state, and can not have any contact, and the distance between the sounding element and the sounding element is kept to be millimeter. The carbon nanotube film can be stretched and tightened due to the stretchability of the carbon nanotube film. The two first electrodes are electrically connected by adopting a lead A, the two second electrodes are electrically connected by adopting a lead B, and the sounding element are in parallel connection, so that the current input into the sounding element and the current input into the sounding element are the same, and the generated sound signal can be enhanced. The environment of the embodiment of the invention is an air environment at room temperature, the input power of each layer of carbon nano tube film is watt, the adopted sound frequency is Hertz, the sound pressure level generated by the single-layer carbon nano tube film sounding element is decibel, and the sound pressure level generated by the embodiment of the invention is decibel.

In the second embodiment of the invention, compared with the first embodiment, the loudspeaker formed by three layers of carbon nanotube film sound generating elements has one more layer of sound generating elements, one first electrode and one second electrode, and the assembly form is the same as that of the first embodiment. The interval between the three layers of sound producing elements is millimeter. The environment of the embodiment of the invention is an air environment at room temperature, the input power of each layer of carbon nano tube film is watt, the adopted sound frequency is Hertz, the sound pressure level generated by the single-layer carbon nano tube film sounding element is decibel, and the sound pressure level generated by the embodiment of the invention is decibel.

In the third embodiment of the present invention, the speaker formed by four layers of carbon nanotube film sound generating elements is provided with two more layers of sound generating elements, two first electrodes and two second electrodes, and the assembly form is the same as that of the first embodiment. The interval between the four layers of sound producing elements is millimeter. The environment of the embodiment of the invention is an air environment at room temperature, the input power of each layer of carbon nano tube film is watt, the adopted sound frequency is Hertz, the sound pressure level generated by the single-layer carbon nano tube film sounding element is decibel, and the sound pressure level generated by the embodiment of the invention is decibel.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a multilayer carbon nanotube film stack formula speaker, includes first electrode and second electrode, and it sets up in basement, this first electrode certain distance of second electrode interval, and sound generating element is connected its characterized in that with first electrode and second electrode electricity: the sounding element is clamped by the first electrode and the second electrode respectively, the spacing element is arranged between the substrate and the sounding element, the carbon nanotube film is composed of carbon nanotubes which are arranged in the same direction and are connected end to end, metal electrodes are connected to two ends of the carbon nanotube film and fixed on the outer frame, the metal electrodes on the same side are connected to the same lead, the metal electrodes connected with the carbon nanotube films on all layers cannot be in contact with each other, the sounding element further comprises the outer frame and multiple layers of carbon nanotube films which are parallel to each other and connected in parallel, and the carbon nanotube films serve as the sounding element.

2. The multi-layered carbon nanotube film stacked speaker as claimed in claim 1, wherein the sound generating element comprises a carbon nanotube structure including at least one carbon nanotube film, one carbon nanotube wire or a composite structure of the carbon nanotube film and the carbon nanotube wire.

3. The multi-walled carbon nanotube film stacked speaker as claimed in claim 2, wherein the spacer member and the substrate are separate parts.

4. The stacked multi-layered carbon nanotube film speaker as claimed in claim 3, wherein the carbon nanotubes in the carbon nanotube film are aligned in a direction parallel to the surface of the carbon nanotube film, and the carbon nanotubes are connected to each other by van der Waals forces.

5. The multi-layered carbon nanotube film stacked speaker as claimed in claim 4, wherein the metal electrode and the carbon nanotube film are bonded by an adhesive or directly coated with the metal electrode.

6. The multi-layered carbon nanotube film stacked speaker as claimed in claim 5, wherein the electrodes are connected to the carbon nanotube film at the ends in the direction of the arrangement of the carbon nanotubes.

7. The stacked speaker as claimed in claim 6, wherein the first and second electrodes are disposed in parallel on the substrate, the first and second electrodes are in a shape of a layer, a rod, a strip, or a block, the carbon nanotubes in the carbon nanotube film are one or more of single-walled carbon nanotubes, double-walled carbon nanotubes, or multi-walled carbon nanotubes, the sounding element is disposed on the spacer element, and opposite sides of the sounding element are clamped by the first and second electrodes, wherein the single-walled carbon nanotubes have a diameter ranging from nm to nm, the double-walled carbon nanotubes have a diameter ranging from nm to nm, and the outer frame is made of a rigid insulating material.

8. The stacked multi-walled carbon nanotube film speaker as claimed in claim 7, wherein the spacer element is electrically insulated from the first electrode and the second electrode when the spacer element is made of a conductive material.