Abstract: A micro-robot magnetic drive device and a control method based on double closed loop three-dimensional path tracking are disclosed. The method includes: inputting a desired tracking path, obtaining current pose information of a magnetic micro-robot through a camera, and then calculating a position of a center of mass, an actual axial direction, coordinates of a desired position point with the shortest distance from the center of mass on a desired tracking path, and a tangent direction of this point; calculating a horizontal distance, a vertical distance, a direction angle error, and a pitch angle error of the two points according to the actual axial direction, the tangent direction, and disturbance compensation; and obtaining a required rotating magnetic field according to a designed position closed loop controller.

Abstract: The present invention provides an earphone, comprising an earphone housing, a speaker cover, a sound emitting tube, and a speaker, wherein the earphone further includes a tuning baffle disposed inside the speaker cover, wherein a sound emitting hole, a sound outlet hole and mode slots are disposed on the speaker cover, and the sound emitting tube is connected to the tuning baffle through the sound emitting hole, a mode protrusion and a tuning hole are disposed on the tuning baffle, and the mode protrusion is limited by different mode slots by rotating the tuning baffle via the sound emitting tube, so as to adjust the sound outlet area of the sound outlet hole. By utilizing the above-mentioned invention, it is possible to adjust the mid-bass frequency response of the earphone so that a single type earphone can exhibits different sound characteristics.

Abstract: An earphone, comprising a rear housing, a front housing, and a loudspeaker unit which divides a cavity formed by the rear housing and the front housing into a front and rear acoustic cavities; wherein the earphone further comprises a sound adjusting element; the front housing is provided with a sound outlet hole and mode posts, and the sound adjusting element is provided with a sound adjusting hole corresponding to the sound outlet hole and a mode adjustment groove corresponding to the mode posts; when the sound adjusting element rotates, the mode adjustment groove may be limited by different mode posts, thus adjusting the volume of the front acoustic cavity and the area of a sound hole for the front acoustic cavity. Use of the above-described invention enables the middle and high frequency responses of the earphone to be adjusted and enables a single earphone to provide different sound characteristics.

Abstract: The present invention provides an earphone, comprising an earphone housing, a speaker cover, a sound emitting tube, and a speaker, wherein the earphone further includes a tuning baffle disposed inside the speaker cover, wherein a sound emitting hole, a sound outlet hole and mode slots are disposed on the speaker cover, and the sound emitting tube is connected to the tuning baffle through the sound emitting hole, a mode protrusion and a tuning hole are disposed on the tuning baffle, and the mode protrusion is limited by different mode slots by rotating the tuning baffle via the sound emitting tube, so as to adjust the sound outlet area of the sound outlet hole. By utilizing the above-mentioned invention, it is possible to adjust the mid-bass frequency response of the earphone so that a single type earphone can exhibits different sound characteristics.

Abstract: An earphone, comprising a rear housing, a front housing, and a loudspeaker unit which divides a cavity formed by the rear housing and the front housing into a front and rear acoustic cavities; wherein the earphone further comprises a sound adjusting element; the front housing is provided with a sound outlet hole and mode posts, and the sound adjusting element is provided with a sound adjusting hole corresponding to the sound outlet hole and a mode adjustment groove corresponding to the mode posts; when the sound adjusting element rotates, the mode adjustment groove may be limited by different mode posts, thus adjusting the volume of the front acoustic cavity and the area of a sound hole for the front acoustic cavity. Use of the above-described invention enables the middle and high frequency responses of the earphone to be adjusted and enables a single earphone to provide different sound characteristics.

Abstract: Disclosed is an earphone comprising a loudspeaker unit, an audio signal wire electrically connected to the loudspeaker unit, and an auxiliary structure; the auxiliary structure comprises a front cover and a housing; a front acoustic cavity is defined as a space between the front cover and the loudspeaker unit, and a rear acoustic cavity is defined as a space between the housing and the loudspeaker unit; an acoustic guide channel capable of enhancing low-frequency performance of the earphone is disposed on one side of an inner sidewall of the housing closer to the loudspeaker unit; the acoustic guide channel comprises an open end and a closed end, and a bottom wall of the acoustic guide channel is provided with a plurality of through holes at a position closer to the closed end. An earphone with this structure improves low-frequency and middle-frequency sound effects of products, and makes the earphone have a good appearance.

Abstract: Disclosed is an earphone comprising a loudspeaker unit, an audio signal wire electrically connected to the loudspeaker unit, and an auxiliary structure; the auxiliary structure comprises a front cover and a housing; a front acoustic cavity is defined as a space between the front cover and the loudspeaker unit, and a rear acoustic cavity is defined as a space between the housing and the loudspeaker unit; a acoustic guide channel capable of enhancing low-frequency performance of the earphone is disposed on one side of inner sidewall of the housing closer to the loudspeaker unit; the acoustic guide channel comprises an open end and a closed end, and bottom wall of the acoustic guide channel is provided with a plurality of through holes at a position closer to the closed end. Earphone with this structure improves low-frequency and middle-frequency sound effects of products, and makes the earphone has a good appearance.