Wireless signal transmission appts. for bicycle speedometer - converts induction from moving permanent magnet into pulsed infrared signal for detection by redundant photodiodes

• Main Authors: DUMBSER, GERHARD. , 8721 NIEDERWERRN, DE, FEY, RAINER, 8720 SCHWEINFURT, DE, THEIN, ALBERT, 8728 HASSFURT, DE
• Format: Patent
• Language: English; German
• Published: 14.10.1993
• Edition: 5
• Subjects: ACCESSORIES PECULIAR TO CYCLES AND NOT OTHERWISE PROVIDED FOR,e.g. ARTICLE CARRIERS, CYCLE PROTECTORS; CYCLE AXLE SUSPENSIONS; CYCLE FRAMES; CYCLE SADDLES OR SEATS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE; CYCLE STEERING DEVICES; CYCLES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; PERFORMING OPERATIONS; PHYSICS; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FORCYCLES; SIGNALLING; TESTING; TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILARSIGNALS; TRANSPORTING

The appts. transmits a signal optically from a light-emitting diode (36) mounted with a pulse generator (34) on the front fork of the bicycle frame, to a pair of p-i-n photodiodes (38,40) fitted to the handlebars and wired to a signal-processing device (42) driving a visual display (20). The LED operates pref. in the infrared spectral region with a convex lens (36a) radiating into a cone (alpha) containing both photodetectors, either of which can continue to receive the signal when the other is occulted by a part of the machine. ADVANTAGE - Less susceptible to interference from power lines or radio broadcast transmitters.