Patent Application
20190037318
The present invention relates to a speaker diaphragm and coil coupling arrangement and method. More particularly, the present invention relates to speaker diaphragm having first and second layers, and a coil receiving opening defined in the first layer which enables a coil to abut against a surface of the second layer that traverses the coil receiving opening.
In a typical audio speaker, a coil and a diaphragm are attached to each other by an adhesive. Conventional speaker diaphragms are typically constructed of a single material such as aluminum or paper, although some speaker diaphragms can be made of multiple layers of different materials. Conventionally, a speaker diaphragm made of a single material can be structured to have a hole that passes entirely through the diaphragm, with the coil extending into the hole and attached by an adhesive to the edges defining the hole. In this arrangement, a gap exist between the coil and the diaphragm, and the adhesive fills the gap to connect the coil and diaphragm together.
Also, a speaker diaphragm made of different materials can have a solid back surface material, in which case the coil can be attached by adhesive to the solid back surface material. Although this may reduce the size of the gap between the coil and the diaphragm itself, the adhesive is present between the coil and the diaphragm. Also, the solid back surface material is present between the coil and the outer material of the diaphragm from which sound waves are emitted.
The gap between the coil and the diaphragm, along with the presence of adhesive in the gap, can reduce the transmission efficiency of the vibration energy from the coil to the diaphragm. Also, in multi-layered speaker diaphragms, the solid back surface material can reduce transmission efficiency of the vibration energy from the coil to the fiber layer of the speaker diaphragm, thus negatively impacting audio quality.
In view of these problems, an embodiment of the present invention provides a speaker comprising a diaphragm including a first layer defining a coil receiving opening therein, and a second layer attached to the first layer and traversing the coil receiving opening. The speaker further comprises a coil having an end extending into the coil receiving opening and abutting against a surface of the second layer that traverses the coil receiving opening. Thus, transmission efficiency between the coil and diaphragm is improved, which improves the audio quality of the speaker.
Referring now to the attached drawings which form a part of this original disclosure:
It should be noted that these figures are intended to illustrate the general characteristics of methods and structure utilized in the illustrative embodiment and to supplement the written description provided below. These drawings may not precisely reflect the precise structural or performance characteristics of any given embodiment, and should not be interpreted as defining or limiting the range of values or properties encompassed by illustrative embodiments unless specified.
Selected embodiments will now be explained with reference to the drawings. It will be apparent to those skilled in the music field from this disclosure that the following descriptions of the embodiments are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. Like reference numerals in the drawings denote like similar or identical elements or features, and thus the descriptions of the similar or identical elements or features may be omitted in later embodiments.
As shown in
The diaphragm 12 in this example includes a first layer 28 that is made of a material, such as paper, as understood in the material arts, especially with regard to materials used for construction of a speaker. The first layer 28 also defines a coil receiving opening 30 therein. The first layer 28, and thus the diaphragm 12, further includes a radially extending portion 32 that extends symmetrically outward from the coil receiving opening 30. The coil receiving opening 30 in this example is defined at a central location or a substantially central location of the diaphragm 12. However, the coil receiving opening 30 need not be located at the center of the diaphragm 12, especially when the diaphragm 12 is configured to have an asymmetrical shape.
In this example, the radially extending portion 32 extends in a hemispherical or conical shape outward from an edge 34 defining the coil receiving opening 30 to an outer edge 36. Also in this example, the outer edge 36 is configured as a circular outer edge 36. However, the radially extending portion 32, and thus the outer edge 36, can have any suitable shape as understood in the art. For instance, the radially extending portion 32 can extend asymmetrically outward to the outer edge 36 which has an oval shape, or any other non-circular shape.
As further shown in
Efforts can be made to optimize the stiffness and the weight of a speaker diaphragm 12 to achieve ideal acoustic properties. Thus, the second layer 38 can be made of, for example, a high-intensity material, such as a poly(p-phenylene-2,6-benzobisoxazole) fiber, which is commonly referred to as a PBO fiber and also known as ZYLON®, or any other suitable material as understood in the art. The second layer 38 thus can function as the outer layer of the speaker diaphragm 12 from which sound waves are emitted. The material (e.g., paper) of the first layer 28 has a first stiffness smaller than a second stiffness of the material (e.g., ZYLON®) of the second layer 38. However, the first layer 28 in this example can have a suitable thickness so that the first layer 28 as a whole has less flexibility than the second layer 38 as a whole. Therefore, the first layer 28 provides rigidity and stability to the speaker diaphragm 12. In particular, the material (e.g., paper) of the first layer 28 and the material (e.g., ZYLON®) of the second layer 38, and the respective thicknesses of the first layer 28 and the second layer 38, are selected so that the speaker diaphragm 12 as a whole has a stable form, and has the desired characteristics of weight, stiffness and internal losses. The second layer 38 includes a central portion 40, and a radially extending portion 42 that extends symmetrically outward from the central portion 40. In this example, the radially extending portion 42 extends in a hemispherical or conical shape outward from the central portion 40 to an outer edge 44. Also in this example, the central portion 40 is configured as a circular central portion 40, and the outer edge 44 is configured as a circular outer edge 44. However, the central portion 40, the radially extending portion 42, and the outer edge 44 can have any suitable shape as understood in the art. For instance, the central portion 40 can have an oval shape, and the radially extending portion 42 can extend asymmetrically outward to the outer edge 44 which can have an oval shape, or any other non-circular shape. In this example, the outer edge 44 of the second layer 38 aligns with or substantially aligns with the outer edge 36 of the first layer 28.
As shown in
As further illustrated in
Hence, the diaphragm 12 can be mounted to the speaker frame 18 via the surround 20, and the coil 14 can be mounted to the speaker frame 18 via the flexible suspension 26, such that the end 52 of the coil 14 extends into the coil receiving opening 30 and abuts against the surface 48 of the second layer 38 that traverses the coil receiving opening 30.
Thus, as shown in the rear perspective view of
Accordingly, the assembly of the coil 14 to the diaphragm 12 as described herein eliminates a gap between the diaphragm 12 and the coil 14, such as in conventional arrangements having an opening entirely through their single-layer diaphragm. Moreover, the assembly of the coil 14 to the diaphragm 12 as described above avoids the presence of the stiff backing material between the coil and outer layer in conventional multi-layered speaker diaphragms, thus improving audio quality. That is, as understood in the art, the surface of a speaker diaphragm 12 acts as an interfacial boundary to emit sound waves into the surrounding environment, such as air. The material and physical properties of the diaphragm 12, and especially the surface of the diaphragm 12, can have a substantial effect on the characteristics of the emitted sound waves, and thus can have a substantial effect on tones and audio quality. A reduction in transmission efficiency of the vibration energy from the coil 14 to the diaphragm 12 can negatively impact audio quality. The embodiments described herein thus eliminate or at least minimize any such reduction in transmission efficiency to improve audio quality.
Alternatively, in another configuration of the second layer 38 as shown in
As can be appreciated from the description herein, the speaker 10 having direct contact between the coil 14 and the second layer 38 of the diaphragm 12 minimizes, or basically eliminates, transmission or propagation loss of the vibration energy from the coil 14 to the second layer 38 of the diaphragm 12. Therefore, the audio quality of the speaker 10 is improved over conventional speakers. Furthermore, since the transmission loss is minimized or substantially eliminated, the second layer 38 of the diaphragm 12 is capable of regenerating even very minute audio signals more effectively than conventional speakers. Therefore, the speaker 10 is particularly suitable for use in high-end Hi-Fi speaker systems as understood in the art.
In understanding the scope of the present invention, the term “detect” as used herein to describe an operation or function carried out by a component, a section, a device or the like includes a component, a section, a device or the like that does not require physical detection, but rather includes determining, measuring, modeling, predicting or computing or the like to carry out the operation or function. The term “configured” as used herein to describe a component, section or part of a device includes hardware and/or software that is constructed and/or programmed to carry out the desired function. The terms of degree such as “substantially”, “about” and “approximately” as used herein mean an amount of deviation of the modified term such that the end result is not significantly changed.
While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. For example, the size, shape, location or orientation of the various components can be changed as needed and/or desired. Components that are shown directly connected or contacting each other can have intermediate structures disposed between them. The functions of one element can be performed by two, and vice versa. The structures and functions of one embodiment can be adopted in another embodiment. It is not necessary for all advantages to be present in a particular embodiment at the same time. Every feature which is unique from the prior art, alone or in combination with other features, also should be considered a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by such feature(s). Thus, the foregoing descriptions of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
