초록 ▼

A solid state control switching and control system (200) for retractable landing lights. A control unit (208) uses an absolute position sensor (214) to monitor the position of the lighthead (210) of the retractable landing light, and actuates a motor (216), brake (217), and lamp (212) in response to

A solid state control switching and control system (200) for retractable landing lights. A control unit (208) uses an absolute position sensor (214) to monitor the position of the lighthead (210) of the retractable landing light, and actuates a motor (216), brake (217), and lamp (212) in response to command signals (220,221,223) from the flight crew. Actuation of the motor (216), brake (217), and lamp (212) with solid state switches (100) is gradual and synchronized to minimize electromagnetic interference and extend component life.

대표청구항 ▼

A solid state control switching and control system (200) for retractable landing lights. A control unit (208) uses an absolute position sensor (214) to monitor the position of the lighthead (210) of the retractable landing light, and actuates a motor (216), brake (217), and lamp (212) in response to

A solid state control switching and control system (200) for retractable landing lights. A control unit (208) uses an absolute position sensor (214) to monitor the position of the lighthead (210) of the retractable landing light, and actuates a motor (216), brake (217), and lamp (212) in response to command signals (220,221,223) from the flight crew. Actuation of the motor (216), brake (217), and lamp (212) with solid state switches (100) is gradual and synchronized to minimize electromagnetic interference and extend component life. nd the envelope contains a radiation emitter which is at least one filament of flat configuration having an unperforated planar surface which is substantially parallel to the emission surface for emitting radiation therethrough, and wherein the planar surface of the filament is of the same shape as the emission surface. 2. A bulb as claimed in claim 1 wherein the bulb has a reflecting surface arranged opposite the emission surface. 3. A bulb as claimed in claim 1, wherein the envelope has a surface which is convex towards the exterior of the envelope situated opposite the emission surface. 4. A bulb as claimed in claim 1 wherein said at least one filament comprises a single filament. 5. A bulb as claimed in claim 1 wherein said at least one filament comprises a plurality of co-planar filaments. 6. A bulb for emitting radiation through an emission surface of an envelope wherein the emission surface is substantially planar and of a given shape and the envelope contains a radiation emitter which is a single filament of flat configuration having an unperforated planar emitting surface which is substantially parallel to the emission surface for emitting radiation therethrough, and wherein the planar surface of the single filament is of the same shape as the emission surface. 7. A bulb for emitting radiation through an emission surface of an envelope, wherein the emission surface is substantially planar and the envelope contains a radiation emitter which is at least one convoluted filament of flat configuration having a planar surface which is substantially parallel to the emission surface, wherein the envelope has a reflecting surface which is convex towards the exterior of the envelope situated opposite the emission surface. itation electrodes, the at least one of the excitation electrodes of the second group being arranged toward the first end surface and being other than the excitation electrodes of the first group; and an output electrode provided on the outer surface of the multilayer piezoelectric element and electrically connected to a third group defined by at least one of the at least four excitation electrodes, the at least one of the excitation electrodes of the third group being arranged toward the second end surface and being other than the excitation electrodes of the first group; whereby an input signal applied between the input electrode and the ground electrode causes excitation and coupling of vibration of different order thickness extensional modes, such that an output signal is extracted between the output electrode and the ground electrode. 12. A longitudinally coupled multi-mode piezoelectric filter according to claim 11, wherein the different order modes are an nth harmonic and an (n-1)th harmonic, n being an integer equal to or greater than 3. 13. A longitudinally coupled multi-mode piezoelectric filter according to claim 11, wherein the different order modes are an nth harmonic, an (n-1)th harmonic, and an (n+1)th harmonic, n being an integer equal to or greater than 3. 14. A longitudinally coupled multi-mode piezoelectric filter according to claim 11, wherein at least one of the first group of the excitation electrodes is arranged between two closest excitation electrodes, one of which belonging to the second group and the other belonging to the third group. 15. A longitudinally coupled multi-mode piezoelectric filter according to claim 11, further comprising: reflection layers respectively coupled to the first and second end surfaces of the multilayer piezoelectric element and made of material having a second acoustic impedance Z2tha