Abstract: A directional microphone including a casing and a microphone element is provided. The casing has a front sound reception hole and at least one rear sound reception hole. The microphone element is disposed in the casing. The microphone element has a front sound reception surface and a rear sound reception surface. The front sound reception hole is located on a same side as the front sound reception surface, and the front sound reception hole is aligned with the front sound reception surface. The rear sound reception hole is located on a same side as the rear sound reception surface, but the rear sound reception hole and the rear sound reception surface are misaligned with each other.

Abstract: A directional microphone including a casing and a microphone element is provided. The casing has a front sound reception hole and at least one rear sound reception hole. The microphone element is disposed in the casing. The microphone element has a front sound reception surface and a rear sound reception surface. The front sound reception hole is located on a same side as the front sound reception surface, and the front sound reception hole is aligned with the front sound reception surface. The rear sound reception hole is located on a same side as the rear sound reception surface, but the rear sound reception hole and the rear sound reception surface are misaligned with each other.

Abstract: An adjustable holding frame mainly includes a first bar, a second bar and an adjusting means. The second bar has one end fastened to a lump element which is pivotally located in the adjusting means. The adjusting means is mounted onto the first bar and has a helical structure to adjust the position of a seat in the adjusting means. Thereby releasing or fastening of the lump element of the second bar can be controlled to adjust the posture condition of the holding frame.

Abstract: An anchor structure for electronic devices includes a plurality of bars that are pivotally coupled through a hinged means. At least one of the bars has a housing space formed in a portion of the interior to allow the bars to be swivelable relative to one another. The anchor structure further has a fastening means which has a handle with a bottom end located in the housing space and hinged on a corresponding bar. The hinged portion on the bottom end of the handle runs through the bar and is fastened to a cam. The housing space also holds a slidable brake element corresponding to the cam and a spring to keep the brake element in contact tightly with the cam so that turning of the cam can selectively move the brake element to a position to escape the axle or to another position to form a tight contact with an axle.

Abstract: An anchor structure for electronic devices includes a plurality of bars that are pivotally coupled through a hinged means. At least one of the bars has a housing space formed in a portion of the interior to allow the bars to be swivelable relative to one another. The anchor structure further has a fastening means which has a handle with a bottom end located in the housing space and hinged on a corresponding bar. The hinged portion on the bottom end of the handle runs through the bar and is fastened to a cam. The housing space also holds a slidable brake element corresponding to the cam and a spring to keep the brake element in contact tightly with the cam so that turning of the cam can selectively move the brake element to a position to escape the axle or to another position to form a tight contact with an axle.

Abstract: An anchor structure for electronic devices includes a plurality of bars that are pivotally coupled through a hinged means. At least one of the bars has a housing space formed in a portion of the interior to allow the bars to be swivelable relative to one another. The anchor structure further has a fastening means which has a handle with a bottom end located in the housing space and hinged on a corresponding bar. The hinged portion on the bottom end of the handle runs through the bar and is fastened to a cam. The housing space also holds a slidable brake element corresponding to the cam and a spring to keep the brake element in contact tightly with the cam so that turning of the cam can selectively move the brake element to a position to escape the axle or to another position to form a tight contact with an axle.

Abstract: An adjustable holding frame mainly includes a first bar, a second bar and an adjusting means. The second bar has one end fastened to a lump element which is pivotally located in the adjusting means. The adjusting means is mounted onto the first bar and has a helical structure to adjust the position of a seat in the adjusting means. Thereby releasing or fastening of the lump element of the second bar can be controlled to adjust the posture condition of the holding frame.