# US RE44,942 E1 · Mobile communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US RE44,942 E1 - Document ID: USRE44942E1 - Status: Granted - Kind: E1 - Application number: 13/767,498 - Filed: 2013-02-14 - Granted: 2014-06-10 - Earliest claimed: 2006-10-25 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sung-Tae Lee; Jin-Ho Kim; Jeong-Hoon Kang - Web page: https://patentgrep.com/patent/USRE44942E1 ## Abstract A mobile communication device is provided. The mobile communication device includes a terminal body, and a speaker module located in the terminal body. The speaker module includes an enclosure located in the terminal body, the enclosure defining a chamber therein, and a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface of the speaker is exposed from the enclosure and the rear surface thereof is positioned within the chamber, to allow a sound generated from the rear surface to resonate within the chamber. A mutual interference between the sound generated from the front side of the sound emission part and the sound emitted from the rear side thereof can be reduced to thereby improve the performance of the middle and low sound. ## Claims ### Claim 1 A mobile communication device comprising: a terminal body; and a speaker module located in the terminal body, the speaker module including: an enclosure located in the terminal body, the enclosure forming a chamber for resonating; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface is exposed to a speaker hole formed on a surface of the terminal body and the rear surface is disposed within the chamber to allow a first sound generated from the front surface of the speaker to be emitted through the speaker hole and a second sound generated from the rear surface to resonate within the chamber; and a sound guide connected to the enclosure with a certain length and guiding the sound resonated in the chamber, wherein the sound guide has an end portion opened within the terminal body such that the second sound resonated within the chamber is discharged to an interior of the terminal body separate body, the interior separated from the chamber. ### Claim 2 (depends on 1) The device of claim 1, wherein the sound guide has a length sufficient to allow phase of the sound generated from the rear surface of the speaker to be inverted. ### Claim 3 (depends on 1) The device of claim 1, wherein the sound guide is flexible. ### Claim 4 (depends on 1) The device of claim 1, wherein the enclosure includes an opening and the sound guide is inserted in the opening so as to be connected with the chamber. ### Claim 5 (depends on 1) The device of claim 1, wherein the sound guide includes a length control portion that controls the length of the sound guide. ### Claim 6 (depends on 5) The device of claim 5, wherein the length control portion includes a plurality of extendable creases. ### Claim 7 (depends on 1) The device of claim 1, wherein an electric wire connected to the speaker extends through an interior of the sound guide. ### Claim 8 (depends on 1) The device of claim 1, wherein the speaker module includes at least a second sound guide connected to the enclosure and guiding the sound in the chamber. ### Claim 9 (depends on 1) The device of claim 1, wherein the terminal body includes a front housing exposing the front surface of the speaker, a rear housing connected to the front housing by connection protrusions, and the enclosure includes at least one through hole to allow the connection protrusions to pass therethrough. ### Claim 10 A mobile communication device comprising: a terminal body; a display module located in the terminal body; and a speaker module located adjacent the display module, the speaker module including: an enclosure located in the terminal body, the enclosure forming a chamber; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface of the speaker is exposed to a speaker hole formed on a surface of the terminal body and the rear surface thereof is disposed within the chamber to allow a first sound generated from the front surface of the speaker to be emitted through the speaker hole and a second sound generated from the rear surface to resonate within the chamber; and a sound guide connected to the enclosure with a certain length and guiding the sound resonated in the chamber, wherein the sound guide has an end portion opened within the terminal body such that the second sound resonated within the chamber discharges to an interior of the terminal body separate body, the interior separated from the chamber. ### Claim 11 (depends on 10) The device of claim 10, wherein the sound guide is disposed between the enclosure and the display module. ### Claim 12 (depends on 10) The device of claim 10, wherein the enclosure has a configuration that corresponds to that of an upper end portion of the terminal body. ### Claim 13 A mobile communication device comprising: a terminal body; and a speaker module located in the terminal body, the speaker module including: an enclosure located in the terminal body, the enclosure forming a chamber for resonating; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface is exposed from the enclosure and the rear surface is disposed within the chamber to allow a first sound generated from the front surface of the speaker to be emitted through a speaker hole formed on a surface of the terminal body and a second sound generated from the rear surface of the speaker to resonate within the chamber; and a sound guide connected to the enclosure with a certain length and guiding the second sound resonated within the chamber, wherein the sound guide extends along a longitudinal direction of the terminal body and has an opening spaced from the enclosure within the terminal body such that the second sound resonated within the chamber is discharged to an interior of the terminal body, the interior separated from the chamber. ### Claim 14 (depends on 13) The device of claim 13, wherein the certain length is sufficient to allow phase of the second sound generated from the rear surface of the speaker to be inverted. ### Claim 15 (depends on 13) The device of claim 13, wherein the sound guide is extendable along a longitudinal direction of the terminal body such that a frequency of the second sound generated from the rear surface of the speaker is lowered when the length of the sound guide is increased. ### Claim 16 (depends on 13) The device of claim 13, wherein the certain length is calculated by the following equation: L = 30000 - S f b - V b - 0.825 × S where ‘L’ is the certain length measured in centimeters, ‘S’ is an opening section of the sound guide measured in cm2, ‘fb’ is a tuning frequency (Hz), and ‘Vb’ is a volume of the chamber measured in liters. ### Claim 17 (depends on 13) The device of claim 13, wherein an electric wire connected to the speaker extends through an interior of the sound guide. ### Claim 18 (depends on 13) The device of claim 13, wherein the sound guide comprises one and another sound guides separately disposed from each other. ### Claim 19 (depends on 18) The device of claim 18, further comprising a display module disposed in the terminal body, wherein the one sound guide extends along one side of the display module, and the another sound guide extends along another side of the display module. ### Claim 20 A mobile communication device comprising: a terminal body; and a speaker module located in the terminal body, the speaker module including: an enclosure located in the terminal body, the enclosure forming a chamber for resonating; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface is exposed from the enclosure and the rear surface is disposed within the chamber to allow a first sound generated from the front surface of the speaker to be emitted through a speaker hole formed on a surface of the terminal body and a second sound generated from the rear surface of the speaker to resonate within the chamber; and a sound guide connected to the enclosure with a certain length and guiding the second sound resonated within the chamber, wherein the sound guide has an opening formed within the terminal body such that the second sound resonated within the chamber is discharged to an interior of the terminal body, the interior separated from the chamber. ### Claim 21 A mobile communication device comprising: a terminal body; a display module disposed in the terminal body; and a speaker module located adjacent the display module, the speaker module including: an enclosure located adjacent a first end of the terminal body, the enclosure forming a chamber; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface of the speaker faces a speaker hole formed on a surface of the terminal body and the rear surface is disposed within the chamber to allow a first sound generated from the front surface to be emitted through the speaker hole and a second sound generated from the rear surface to resonate within the chamber; and a sound guide connected to the enclosure with a certain length and guiding the second sound resonating within the chamber, wherein the sound guide extends along an edge of the display module towards a second end of the terminal body opposite the first end, the sound guide having an opening spaced from the enclosure within the terminal body such that the second sound resonated within the chamber is discharged to an interior of the terminal body, the interior separated from the chamber. ### Claim 22 A mobile communication device comprising: a terminal body; and a speaker module located in the terminal body, the speaker module including: an enclosure located in the terminal body, the enclosure forming a chamber for resonating; a speaker having a front surface and a rear surface, the speaker being located in the enclosure such that the front surface faces a speaker hole formed on a surface of the terminal body and the rear surface is disposed within the chamber to allow a first sound generated from the front surface of the speaker to be emitted through the speaker hole and a second sound generated from the rear surface to resonate within the chamber; and a sound guide connected to the enclosure, the sound guide providing an air path for guiding the second sound to an interior of the terminal body, the sound guide having an opening spaced from the enclosure by a certain length such that the second sound is emitted in a phase-inverted state through the air path. ### Claim 23 (depends on 20) The device of claim 20, wherein the certain length is sufficient to allow phase of the second sound generated from the rear surface of the speaker to be inverted. ### Claim 24 (depends on 20) The device of claim 20, wherein the sound guide is extendable along a longitudinal direction of the terminal body such that a frequency of the second sound generated from the rear surface of the speaker is lowered when the length of the sound guide is increased. ### Claim 25 (depends on 20) The device of claim 20, wherein the certain length is calculated by the following equation: L = 30000 - S f b - V b - 0.825 × S where ‘L’ is the certain length measured in centimeters, ‘S’ is an opening section of the sound guide measured in cm2, ‘fb’ is a tuning frequency (Hz), and ‘Vb’ is a volume of the chamber measured in liters. ### Claim 26 (depends on 20) The device of claim 20, wherein an electric wire connected to the speaker extends through an interior of the sound guide. ### Claim 27 (depends on 20) The device of claim 20, wherein the sound guide comprises one and another sound guides separately disposed from each other. ### Claim 28 (depends on 27) The device of claim 27, further comprising a display module disposed in the terminal body, wherein the one sound guide extends along one side of the display module, and the another sound guide extends along another side of the display module. ### Claim 29 (depends on 28) The device of claim 28, wherein the terminal body comprises a front housing and a rear housing which are attached to each other, and wherein a window is provided in the front housing through which a screen image of the display module is viewable. ### Claim 30 (depends on 21) The device of claim 21, wherein the certain length is sufficient to allow phase of the second sound generated from the rear surface of the speaker to be inverted. ### Claim 31 (depends on 21) The device of claim 21, wherein the sound guide is extendable along a longitudinal direction of the terminal body such that a frequency of the second sound generated from the rear surface of the speaker is lowered when the length of the sound guide is increased. ### Claim 32 (depends on 21) The device of claim 21, wherein the certain length is calculated by the following equation: L = 30000 - S f b - V b - 0.825 × S where ‘L’ is the certain length measured in centimeters, ‘S’ is an opening section of the sound guide measured in cm2, ‘fb’ is a tuning frequency (Hz), and ‘Vb’ is a volume of the chamber measured in liters. ### Claim 33 (depends on 21) The device of claim 21, wherein an electric wire connected to the speaker extends through an interior of the sound guide. ### Claim 34 (depends on 21) The device of claim 21, wherein the sound guide comprises one and another sound guides separately disposed from each other. ### Claim 35 (depends on 34) The device of claim 34, wherein the one sound guide extends along one side of the display module, and the another sound guide extends along another side of the display module. ### Claim 36 (depends on 21) The device of claim 21, wherein the terminal body comprises a front housing and a rear housing which are attached to each other, and wherein a window is provided in the front housing through which a screen image of the display module is viewable. ### Claim 37 (depends on 21) The device of claim 21, wherein the terminal body has two shorter lateral sides, and two longer lateral sides which interconnect the shorter sides in a rectangular fashion, wherein the enclosure is disposed between the display module and one of the shorter lateral sides of the terminal body, and wherein the sound guide extends along an edge of the display module between the display module and one of the longer lateral sides of the terminal body. ### Claim 38 (depends on 22) The device of claim 22, wherein the certain length is sufficient to allow phase of the second sound generated from the rear surface of the speaker to be inverted. ### Claim 39 (depends on 22) The device of claim 22, wherein the sound guide is extendable along a longitudinal direction of the terminal body such that a frequency of the second sound generated from the rear surface of the speaker is lowered when the length of the sound guide is increased. ### Claim 40 (depends on 22) The device of claim 22, wherein the certain length is calculated by the following equation: L = 30000 - S f b - V b - 0.825 × S where ‘L’ is the certain length measured in centimeters, ‘S’ is an opening section of the sound guide measured in cm2, ‘fb’ is a tuning frequency (Hz), and ‘Vb’ is a volume of the chamber measured in liters. ### Claim 41 (depends on 22) The device of claim 22, wherein an electric wire connected to the speaker extends through an interior of the sound guide. ### Claim 42 (depends on 22) The device of claim 22, wherein the sound guide comprises one and another sound guides separately disposed from each other. ### Claim 43 (depends on 42) The device of claim 42, further comprising a display module disposed in the terminal body, wherein the one sound guide extends along one side of the display module, and the another sound guide extends along another side of the display module. ### Claim 44 (depends on 43) The device of claim 43, wherein the terminal body comprises a front housing and a rear housing which are attached to each other, and wherein a window is provided in the front housing through which a screen image of the display module is viewable.