TWI669968B - Speaker module - Google Patents

Abstract

The invention provides a speaker module comprising a diaphragm structure, a rear sound chamber and a cavity. The diaphragm structure has a front end and a rear end. The rear sound chamber is connected to the rear end of the diaphragm structure. The cavity is coupled to the front end of the diaphragm structure and has a sound output opening.

Description

Speaker module

The present invention relates to a speaker module, and more particularly to a speaker module having a cavity at the front end of the diaphragm structure.

With the advancement of technology, human beings are pursuing convenience, and the size specifications of portable electronic products are becoming thinner and lighter. Speakers used in tablet computers and notebooks of the split type, plug-in type, flip type, etc., do not perform well at low frequencies due to space and size limitations.

In order to improve the low-frequency performance of the speaker of the portable electronic product, it is common to set a woofer system outside the existing speaker and use the volume of the rear sound chamber to generate the bass. However, the back cavity of a typical woofer needs to have a large enough volume to produce the required low frequency performance, so it is not suitable for use in thin and portable electronic products.

The invention provides a speaker module with good low frequency performance and can save configuration space.

The speaker module of the present invention comprises a diaphragm structure, a rear sound chamber and a cavity. The diaphragm structure has a front end and a rear end. The rear sound chamber is connected to the rear end of the diaphragm structure. The cavity is coupled to the front end of the diaphragm structure and has a sound output opening.

Based on the above, in the speaker module of the present invention, in addition to the rear sound chamber provided at the rear end of the diaphragm structure, a cavity is provided at the front end of the diaphragm structure. In the case where the volume of the rear chamber is small enough to achieve the desired low frequency performance by itself, the cavity can improve the low frequency performance of the speaker module by filtering out high frequency sound waves and/or resonating low frequency sound waves. . Accordingly, there is no need to increase the volume of the rear chamber in order to meet the demand for low frequency performance, so as to save space in the arrangement of the speaker module in the electronic device.

The above described features and advantages of the invention will be apparent from the following description.

1 is a schematic diagram of an electronic device in accordance with an embodiment of the present invention. 2 is a partial plan view of the speaker module of FIG. 1. Referring to FIG. 1 and FIG. 2 , the speaker module 100 of the present embodiment is disposed on a host computer of the electronic device 50 , and the electronic device 50 is, for example, a notebook computer. The speaker module 100 includes a diaphragm structure 110, a rear sound chamber 120, and a cavity 130. The diaphragm structure 110 has opposite front ends 110a and rear ends 110b. The rear sound chamber 120 is connected to the rear end 110b of the diaphragm structure 110. The cavity 130 is connected to the front end 110a of the diaphragm structure 110 and has an acoustic output port 130a.

Under this configuration, in addition to the rear sound chamber 120 of the general speaker provided at the rear end 110b of the diaphragm structure 110, the cavity 130 is further provided at the front end 110a of the diaphragm structure 110. In the case where the volume of the rear chamber 120 is small and not sufficient to achieve the desired low frequency performance by itself, the cavity 130 can enhance the speaker module 100 by filtering out high frequency sound waves and/or resonating low frequency sound waves. Low frequency performance. Accordingly, it is not necessary to increase the volume of the rear sound chamber 120 in order to meet the demand for low frequency performance, so as to save the arrangement space of the speaker module 100 in the electronic device 50. Specifically, by arranging the cavity 130 at the front end 110a of the diaphragm structure 110, for example, the volume of the rear chamber 120 can be controlled within a range of more than 0 ml and less than 4 ml (eg, 1.7 ml), thereby making the speaker module The group 100 can be designed as a small-sized structure having a length, a width, and a thickness of, for example, 34 mm, 11 mm, and 4 mm, respectively.

The structure and mode of operation of the cavity 130 of the present embodiment will be described in detail below. Referring to FIG. 2, the cavity 130 of the speaker module 100 includes a waveguide 132 and a front sound chamber 134. The sound output port 130a is disposed at one end 132a of the waveguide 132, and the front sound chamber 134 is coupled between the front end 110a of the diaphragm structure 110 and the other end 132b of the waveguide 132. The front sound chamber 134 can filter out high frequency portions of the sound waves from the diaphragm structure 110. The waveguide 132 can resonate the acoustic waves from the diaphragm structure 110 into the desired low frequency sound waves to enhance the low frequency performance of the speaker module 100. The sound waves generated by the diaphragm structure 110 can sequentially pass through the front sound chamber 134 and the waveguide 132 to the sound output port 130a, so that the speaker module 100 generates sound waves having a low frequency from the sound output port 130a.

Specifically, the volume of the front sound chamber 134 is, for example, between 0.13 and 2 milliliters (eg, 1.6 milliliters) to filter out high frequency sound waves in a specific frequency band. Further, the total length of the waveguide 132 is, for example, a multiple of a quarter of the wavelength of the frequency of the desired low frequency sound wave, such as 85 mm, and the cross-sectional area of the waveguide 132 is, for example, 10 to 20 square millimeters (e.g., 13.2 square). Mm), such that its equivalent volume is, for example, between 1 and 3 ml (eg 1.2 ml), thereby resonating the desired low frequency sound waves. The bass frequency is, for example, no more than 300 Hz.

In the present embodiment, the waveguide 132 has at least one bent portion 132c (shown as two) and a plurality of mutually parallel segments 132d, and each bent portion 132c is connected to two parallel segments of the waveguide 132. Between 132d, the waveguide 132 is integrally formed in a meander shape to avoid the extension of the waveguide 132 being too large to increase the size of the speaker module 100. In other embodiments, the waveguide 132 can be other suitable extensions, and the invention is not limited thereto.

The specific structure of the diaphragm structure 110 of the present embodiment will be described below. Figure 3 is a side elevational view showing a partial structure of the diaphragm structure of Figure 2; Referring to FIG. 3, the diaphragm structure 110 of the present embodiment includes a housing 112 and a diaphragm 114. The diaphragm 114 is disposed in the housing 112 and partitions the interior of the housing 112 into a first space 112a and a second space. 112b. The diaphragm 114 generates vibration according to the input signal, and the first space 112a and the second space 112b provide space required for the diaphragm 114 to vibrate and are respectively connected to the rear chamber 120 and the body 130. In addition, in this embodiment, the diaphragm 114 vibrates in a vibration direction D1, and the rear sound chamber 120, the diaphragm structure 110, and the cavity 130 are sequentially arranged along an array direction D2, and the vibration direction D1 and the array direction D2 are perpendicular to each other. . In other embodiments, the vibration direction D1 of the diaphragm 114 may be parallel to the rear sound chamber 120, the diaphragm structure 110, and the arrangement direction D2 of the cavity 130, which is not limited by the present invention.

4 is a partial plan view of a speaker module according to another embodiment of the present invention, which uses the same component symbols as the speaker module 100 of the embodiment shown in FIG. 2, and thus will not be repeatedly described. The difference between the speaker module 100' of the embodiment shown in FIG. 4 and the speaker module 100' of the embodiment shown in FIG. 2 is that the cavity 130' of the speaker module 100' does not have the front sound chamber shown in FIG. 134. Accordingly, the waveguide 132' has different lengths and cross-sectional areas than the waveguide 132 shown in FIG. 2 to resonate the desired low frequency sound waves without the front chamber 134.

Specifically, the total length of the waveguide 132' is, for example, a multiple of a quarter of the wavelength of the frequency of the desired low frequency sound wave, such as 120 mm, and the cross-sectional area of the waveguide 132 is, for example, 10 to 20 square millimeters ( For example, 16.9 square millimeters, the equivalent volume is, for example, between 1 and 3 milliliters (such as 2.3 milliliters), thereby resonating the desired low frequency sound waves. The bass frequency is, for example, no more than 300 Hz.

In summary, in the speaker module of the present invention, in addition to the rear sound chamber disposed at the rear end of the diaphragm structure, a cavity is provided at the front end of the diaphragm structure. In the case where the volume of the rear chamber is small enough to achieve the desired low frequency performance by itself, the cavity can improve the low frequency performance of the speaker module by filtering out high frequency sound waves and/or resonating low frequency sound waves. . Accordingly, there is no need to increase the volume of the rear chamber in order to meet the demand for low frequency performance, so as to save space in the arrangement of the speaker module in the electronic device.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

50‧‧‧Electronic devices

100, 100'‧‧‧ speaker module

110‧‧‧diaphragm structure

110a‧‧‧ front end

110b‧‧‧ backend

112‧‧‧Shell

112a‧‧‧First space

112b‧‧‧Second space

114‧‧‧Densor

120‧‧‧After the sound chamber

130, 130'‧‧‧ cavity

130a‧‧‧Sound output

132, 132'‧‧‧ waveguide

End of 132a‧‧‧

132b‧‧‧The other end

132c‧‧‧Bend

Section 132d‧‧‧

134‧‧‧ front sound chamber

D1‧‧‧Vibration direction

D2‧‧‧Arranged direction

1 is a schematic diagram of an electronic device in accordance with an embodiment of the present invention. 2 is a partial plan view of the speaker module of FIG. 1. Figure 3 is a side elevational view showing a partial structure of the diaphragm structure of Figure 2; 4 is a partial plan view showing a structure of a speaker module according to another embodiment of the present invention.

Claims (8)

A speaker module includes: a diaphragm structure having an opposite front end and a rear end; a rear sound chamber coupled to the rear end of the diaphragm structure; and a cavity including a waveguide, wherein the a cavity connected to the front end of the diaphragm structure and having a sound output opening formed at an end of the waveguide, the sound output opening being adapted to generate an acoustic wave having a bass frequency, wherein the waveguide The length is equal to a multiple of a quarter of the wavelength of the bass frequency. The speaker module of claim 1, wherein the volume of the rear sound chamber is greater than 0 milliliters and less than 4 milliliters. The speaker module of claim 1, wherein the cavity comprises a front sound chamber, the front sound chamber being connected between the front end and the waveguide. The speaker module of claim 1, wherein the waveguide comprises at least one bent portion connected between two sections of the waveguide, the two sections being parallel to each other. The speaker module of claim 1, wherein the other end of the waveguide is connected to the diaphragm structure. The speaker module of claim 1, wherein the bass frequency is no more than 300 Hz. The speaker module of claim 1, wherein the diaphragm structure comprises a casing and a diaphragm, wherein the diaphragm is disposed in the casing and the casing is The inner partition is a first space and a second space, the first space is connected to the rear sound chamber, and the second space is connected to the cavity. The speaker module of claim 1, wherein the diaphragm structure comprises a diaphragm, the diaphragm is adapted to vibrate in a vibration direction, the rear sound chamber, the diaphragm structure and the cavity along the cavity The arrangement direction is sequentially arranged, and the vibration direction is perpendicular to the arrangement direction.