Nec Corporation

Hosiden Corporation

Kenji Fukazawa

Hiroshi Yoshida

Katsumi Shiono

Satoru Fujiwara

Naoya Fujimoto

Tomohiko Kamimura

A microphone () is fitted with a mounting portion () of a front case () in a state being set to a microphone folder (). A metallic mesh-wise sheet () is attached to a front face of the microphone. When an EL sheet () on a rear face of the front case emits light by supplying power to it, electrical noise is radiated from the EL sheet. The mesh-wise sheet of the front face of the microphone blocks the electrical noise from the EL sheet, which may enter through a sound hole () to the inside of the microphone.

Mobile terminal and noise prevention structure of mobile terminal

A portable terminal comprising a housing which incorporates a receiving speaker, an earpiece portion which allows a user to listen to an output sound from the receiving speaker, a first sound emission portion and a second sound emission portion which guide the output sound from the receiving speaker to the earpiece portion, and a sound guide space which communicates the first sound emission portion and the second sound emission portion. The first sound emission portion is opposed to the receiving speaker. The second sound emission portion is formed in plane with and near to the first sound emission portion. The second sound emission portion is located at a center of the earpiece portion.

Portable terminal with first and second sound emission portions

A portable telephone according to this invention includes a housing () which incorporates a display unit and a receiving speaker (), a first sound emission portion () and a second sound emission portion () which guide an output sound from the receiving speaker to the outside of the housing, a sound guide hole () which communicates the first sound emission portion and the second sound emission portion, and a screen () which protects the display unit. The first sound emission portion is formed at a position opposing an output sound generating main surface () of the receiving speaker, and the second sound emission portion is formed at a portion adjacent to the position opposing the output sound generating main surface. The sound guide hole is formed by covering a groove (), formed on the housing to connect the first sound emission portion to the second sound emission portion, with the screen. This arrangement enables stable emission of an output sound without sacrificing downsizing and thickness reduction of the portable telephone regardless of the position of an earpiece portion to allow a user to listen to the output sound that the user's ear pinna opposes.

Portable terminal

A speaker includes a protector () which protects a speaker main body, a speaker opening () formed in one side surface of the speaker main body, a speaker sound hole () formed in the protector, and a cushion member () arranged on the protector. The speaker is attached to a rear side case () such that the speaker opening opposes a housing sound hole () formed in the side surface of the rear side case () of a mobile telephone. Hence, a cavity () communicating with the housing sound hole is formed between the protector of the speaker and the major surface of the rear side case. With this structure, a distance from the speaker opening which outputs a sound generated by the speaker main body to the housing sound hole becomes shorter than in the conventional case, and the cavity can be utilized as an acoustic transfer space. Even when the mobile telephone is made thin, an increase in acoustic resistance can be suppressed, and deterioration in characteristics of a speaker output sound can be decreased.

Mobile terminal and speaker

The present invention relates to an electric acoustic converter used as a speaker or a receiver of a mobile communication device such as a portable telephone or the like. In the electric acoustic converter according to the present invention, the size reduction and thinning of the thickness of the electric acoustic converter can be promoted by providing surface-like rear surface terminals 81 and 82 on the exposed surface 33 which is a rear surface of the yoke 3.

Growing community of inventors

Saitama, Japan

Kenji Fukazawa