Abstract:
A panel light frame is revealed. Each of two ends of a second frame strip is inserted between a pressing end surface and a top end surface of a first frame strip. A front edge of the second frame strip is leaning against the pressing end surface of the first frame strip and an outer end surface of the second frame strip is leaning against the top end surface of the first strip. Thus connection end surfaces of the first and the second frame strip are connected to and positioned by each other. Thereby light from light emitting modules is shielded by the connection end surfaces for preventing light leakage. Moreover, the first and the second frame strips are against, supported and positioned by each other and this makes the connection of the frame strips more convenient. The panel light frame has higher practical value.
Abstract:
A method for correcting birefringence in a fiber optic coupler comprising measuring the intrinsic birefringent retardation, fast axis orientation and rotation of separate paths through the coupler and adding lumped birefringent elements to the ports of the coupler in a fashion to compensate for the intrinsic birefringence.
Abstract:
A flushing device controllable for discharging a desired amount of water after use of a toilet is provided with a cylinder supported within the tank, a piston slidable in the cylinder and divides the inner space thereof into an upper chamber and a lower chamber with variable volumes, on the piston there are provided with through holes for communicating these two chambers, and a flexible baffle member is attached to the bottom surface of the piston and capable of admitting the water to flow from the upper chamber into the lower chamber. A piston rod is connected to the piston and terminates in a stopper positioned in alignment with the flushing pipe, by means of a compression spring mounted with respect to the piston rod between the cylinder and the stopper, the stopper is normally biassed against the flushing pipe until a pull of the piston which forces the stopper moved away from the discharging pipe against the biassing of the spring and so that initiates the flushing, a lower chamber filled with water having a volume corresponding to the piston displacement is caused in the movement of the piston, the piston and the stopper is therefore prevented from lowering until the compression predominates over the buoyance of water received in the lower chamber.