Abstract: The present invention provides a speaker, including a frame with a containment space, a magnetic circuit system and a vibration system. The vibration system includes a vibration diaphragm. The diaphragm includes a dome and a suspension. The suspension includes a first fixed part, a suspension part, and a second fixed part extending away from the first fixed part from the outer edge of suspension part. The suspension part includes two short axle parts, two long axle parts, and a corner part connecting adjacent short axle parts and long axle parts. The vibration diaphragm includes a reinforcement assembly connected to the corner part and connected to the first fixed part and the second fixed part at both ends. By virtue of reinforcement assembly at the corner part of the suspension, the speaker can obtain better acoustic performance.

Abstract: The present invention discloses a micro speaker, including a frame with a containment space, a magnetic circuit system and a vibration system accommodated in the containment space. The vibration system includes a first diaphragm, a dome skeleton fixed to the first diaphragm, and a voice coil fixed on the dome skeleton. A welding plate structure is fixed on the dome skeleton, and a first circuit board and a second circuit board fixed to the frame respectively. The first diaphragm includes a first diaphragm area and a second diaphragm area. The thickness of the first diaphragm area is greater than the thickness of the second diaphragm area. The local thickening material is adopted to avoid the problem of speaker rigidity asymmetry caused by unbalanced heat distribution, so as to realize the stable operation of the speaker, and the manufacturing process is simple.

Abstract: The present invention provides a micro speaker, including a frame with a containment space, and a magnetic circuit system and a vibration system contained in the containment space. The vibration system includes a first diaphragm, a circuit board, a skeleton, and a voice coil. The micro speaker further includes a welding plate structure and a balance component. The voice coil includes a lead wire electrically connected with the welding plate structure. By setting the balance component on the skeleton, the present invention can keep the weight balance at both ends of the skeleton, so as to ensure that the skeleton will not sway when the vibration system is working, so that the vibration of the skeleton is stable and the sound quality is improved.

Abstract: The present invention provides a speaker, including a frame with a containment space, a magnetic circuit system and a vibration system. The vibration system includes a vibration diaphragm. The diaphragm includes a dome and a suspension. The suspension includes a first fixed part, a suspension part, and a second fixed part extending away from the first fixed part from the outer edge of suspension part. The suspension part includes two short axle parts, two long axle parts, and a corner part connecting adjacent short axle parts and long axle parts. The vibration diaphragm includes a reinforcement assembly connected to the corner part and connected to the first fixed part and the second fixed part at both ends. By virtue of reinforcement assembly at the corner part of the suspension, the speaker can obtain better acoustic performance.

Abstract: Disclosed are a GM type cryogenic refrigerator rotary valve and a preparation method therefor. The GM type cryogenic refrigerator rotary valve comprises an aluminum alloy rotating valve and an alumina ceramic membrane. A valve body of the aluminum alloy rotating valve is provided with a first surface for arranging a working boss and a second surface opposite to the first surface; and a high-pressure hole and a low-pressure groove are both provided in the working boss, and a vent hole is provided in the first surface; the high-pressure hole and the vent hole both penetrate the valve body, and an air chamber is formed on the second surface. The alumina ceramic membrane is plated on surface of the aluminum alloy rotating valve. The preparation method comprises: plating an alumina ceramic membrane on surface of an aluminum alloy rotating valve by means of a micro-arc oxidation process.

Abstract: Provided is a ground moving device comprising a stabilizer and a stabilizer-carrying assembly. The stabilizer is disposed on the carrying assembly. The stabilizer comprises: a fastening frame having a first connection portion connected to a first connection portion of the carrying assembly; and a mount having a first connection portion connected to a second portion of the fastening frame. When filming during motion is desired, a photographer fastens an image capturing device to the mount, and focuses on controlling the ground moving device to move forward, backward or rotate to achieve filming during motion, such that safety of the photographer and image quality are ensured. When photographers desire to film themselves, photographers can track and film themselves by means of employing a hand-held controller to remotely control the ground moving device or by means of remotely controlling a mount. Also provided is a mount and a robot head.