摘要:
A multi-track stereo sound earphone includes an earphone main body, which includes a loudspeaker inside, a resonance cavity connected thereto, a sound hole plate, and a solid plate. The earphone main body further includes: at least a low sound hole, disposed in middle position of a lower encircling perimeter of the resonance cavity; at least a high sound hole, disposed in a middle position of an upper encircling perimeter of the resonance cavity; and a plurality of medium sound holes, disposed surrounding a sound hole plate in front of the loudspeaker. The solid plate is disposed in center of the sound hole plate, opposite to center of a vibration membrane of loudspeaker. The diameters of the plurality of medium sound holes decrease from bottom to top, and the plurality of medium sound holes are distributed around outer perimeter of the solid plate.
摘要:
The instant disclosure provides a photo-frame-type display and a support unit thereof. The display has a display frame unit having a bottom portion disposable on a working surface. The support unit comprises a connecting base unit fixedly disposed to the back of the display frame unit, an inclining module pivotally coupled to the connecting base unit, and a rebounding module on the back of the display frame unit in elastic connection with the inclining module. The photo-frame-type display may be disposed on a tabletop in a fashion resembling a traditional photo frame, and the support unit is capable of steadily sustaining the display frame unit in a steep inclining configuration suitable for touch-screen/handwriting operations.
摘要:
An electronic device and a keyboard thereof. The keyboard, provided with a plurality of key positions, comprises a first circuit board having a plurality of first conductors corresponding to the key positions, a second circuit board corresponding to the first circuit board and having a plurality of second conductors opposite to the first conductors, an isolation layer disposed between the first and second circuit boards comprising a plurality of through holes through which the first conductors contact the corresponding second conductors, and a vibration module connected to the second circuit board. When the first circuit board is pressed causing the first conductor to contact the second conductor, the vibration module vibrates the first and second circuit boards.
摘要:
A digital circuit simulation method and apparatus provide for critical path timing analysis of digital circuitry using a hybrid path tracing method. The hybrid path tracing performs path tracing when, for example, simulation values change at designated inputs. The path tracing can employ the simulation values for eliminating blocked paths. During tracing, the method and apparatus determine the shortest and longest paths from each input or beginning point to each end point. The end points are typically storage elements such as latches, flip-flops or systems outputs at a high functional level. The critical path tracing analysis finds the shortest and longest paths from the beginning point to the end point and records and saves the violation history, if any, associated with those paths. A timing template allows the user to develop the necessary input stimuli, in a logical ordered format to test the timing behavior of the digital circuit to be designed. Special procedures are also available for enabling the iteration of stimuli to check the timing of a transparent latch-based design. The system thus provides as an output either a summary or detailed history of violations at selected levels within the circuit to be analyzed. User input enables the system to isolate upon particular portions of the circuitry for determining correct operation.
摘要:
A solar energy collector comprises a solid body having a substantially planar solar energy absorbing collecting surface. The solid body has a first thickness at a center portion tapering to a second thickness at each of a pair opposing edge portions defining a width of the body. A bore extends completely through the body along its length and is aligned along an axis at the center portion. A window transparent at most solar radiation in the visible spectrum and near UV to infrared-red solar energy wavelengths is disposed at a distance from the collecting surface, the window sealed around a periphery of the collecting surface to define a sealed air gap or nitrogen gas filled gap between the collecting surface and the bottom surface of the window. The solar energy collector is a major component of a solar water heating system.
摘要:
The instant disclosure provides a photo-frame-type display and a support unit thereof. The display has a display frame unit having a bottom portion disposable on a working surface. The support unit comprises a connecting base unit fixedly disposed to the back of the display frame unit, an inclining module pivotally coupled to the connecting base unit, and a rebounding module on the back of the display frame unit in elastic connection with the inclining module. The photo-frame-type display may be disposed on a tabletop in a fashion resembling a traditional photo frame, and the support unit is capable of steadily sustaining the display frame unit in a steep inclining configuration suitable for touch-screen/handwriting operations.
摘要:
A work bench includes a table secured on top of a base and having a pair of parallel grooves. Two pairs of sprockets are rotatably secured to the table and extended inward of the grooves. Two endless chains are engaged with the sprockets and each has a portion slidably engaged in the grooves. A guide is secured to the chains and moveable in concert with the chains. Two couplers are secured between the guide and the chains. One of the couplers includes a downward dependent ear for slidably engaging with the table. A quick release device is secured to the other coupler for engaging with the table and for locking the guide to the table. The guide may be quickly adjusted relative to the table when the quick release device is released.
摘要:
A solar energy collector comprises a solid body having a substantially planar solar energy absorbing collecting surface. The solid body has a first thickness at a center portion tapering to a second thickness at each of a pair opposing edge portions defining a width of the body. A bore extends completely through the body along its length and is aligned along an axis at the center portion. A window transparent at most solar radiation in the visible spectrum and near UV to infrared-red solar energy wavelengths is disposed at a distance from the collecting surface, the window sealed around a periphery of the collecting surface to define a sealed air gap or nitrogen gas filled gap between the collecting surface and the bottom surface of the window. The solar energy collector is a major component of a solar water heating system.
摘要:
A brake assembly for braking a wheel of a bicycle includes left and right brake arms and left and right brake shoes. Each brake shoe includes a holder mounted to the respective brake arm, a pad unit mounted on the holder and having a friction surface that is brought to frictionally engage a rim side of a wheel rim of the wheel, and a magnetically attracting unit mounted on the holder for establishing a magnetic field such that, in the course of a braking action, the strength of the established magnetic field is gradually increased to be of a magnitude sufficient to generate a dragging force to decelerate the running speed of the wheel rim until the friction surface frictionally engages the rim side.