An electronic rotary encoder is configured to be disposed on a vertical rotary shaft in a rotary object to obtain two encoded signals: a phase A signal and a phase B signal for calculating a rotational speed and a position. The electronic rotary encoder includes: at least one Hall element outputting Hall signals used as a square wave of the phase A signal; two capacitors, to respectively obtain a first voltage and a second voltage; two buffer gates, to respectively output waveform signals of a first X voltage and a second X voltage; two comparators outputting, a control signal through a latch; and an exclusive OR gate, where a direction signal and the control signal outputted through the latch are inputted to the exclusive OR gate, to obtain the phase B signal.

There is provided an optical encoder including a phase shifter circuit and a multiple hysteresis comparators. The phase shifter circuit receives four input signals, and outputs multiple phase shifted signals based on the four input signals. Each of the multiple hysteresis comparators uses a changeable operation hysteresis level to compare a couple of phase shifted signals among the multiple phase shifted signals, wherein the changeable operation hysteresis level is determined corresponding to a signal frequency of the four input signals.

The present disclosure includes: a magnetic member configured to cause a large Barkhausen effect; a power generation coil disposed so as to be wound around the magnetic member; and soft magnetic members formed at both end portions of the magnetic member so as to be in contact with the magnetic member and so as to press the magnetic member. Consequently, evenness of a magnetic flux density inside the magnetic member is increased, and the large Barkhausen effect is stably caused, whereby a highly stable power generation element is obtained.

An improved counter may implement dynamic frequency measurement while also remaining fully backwards compatible with traditional frequency measurement methods. The counter may operate according to low-frequency, large range, and/or high frequency modes of operation. It may be programmable with a divisor value associated with the large range operating mode, and a measurement time associated with the high frequency mode of operation. The divisor and measurement time settings may be enabled or disabled, and when either setting is disabled, the counter becomes backwards compatible with traditional frequency measurement methods. The counter may also be provided with inputs representative of the desired type of measurement and the minimum and maximum expected values for the signal to be measured. The counter may perform the frequency measurement according to any one or more of the operating modes, and return a measurement result obtained in the operating mode that completes the measurement first.

An improved counter may implement dynamic frequency measurement while also remaining fully backwards compatible with traditional frequency measurement methods. The counter may operate according to low-frequency, large range, and/or high frequency modes of operation. It may be programmable with a divisor value associated with the large range operating mode, and a measurement time associated with the high frequency mode of operation. The divisor and measurement time settings may be enabled or disabled, and when either setting is disabled, the counter becomes backwards compatible with traditional frequency measurement methods. The counter may also be provided with inputs representative of the desired type of measurement and the minimum and maximum expected values for the signal to be measured. The counter may perform the frequency measurement according to any one or more of the operating modes, and return a measurement result obtained in the operating mode that completes the measurement first.

An embodiment of present application discloses a light sensing module for use with a reflector. The light sensing module includes a housing, an optical transceiver, and a shading hood. The housing includes a through hole. The optical transceiver includes a light source, a light sensor, and a separating wall. The light source is disposed in the housing for emitting a first light. The first light can pass through the housing via the through hole, and be reflected as a second light by the reflector. The light sensor is disposed in the housing for receiving the second light. The separating wall is disposed between the light source and the light sensor. The shading hood is located at a position corresponding to the light sensor, and has an opening positioned in an optical path of the second light.

An electronic device comprises a housing, a motion sensor configured to sense motion of the housing, and a processor configured to determine an impact geometry based on the motion. A countermeasure system comprises an actuator coupled to an actuated member. The actuated member is operable by the actuator to modify the impact geometry, so that impact energy is redirected away from an impact sensitive component of the electronic device to an energy absorbing component of the electronic device.

A brake device for braking a wheel, having a brake drum, a brake carrier for shifting a brake lining in order to press the brake lining against the brake drum, a sensor for sensing a rotational speed of the wheel, and an adjustment element configured to be coupled to the sensor and to spatially adjust the sensor.

A rotation detection device includes a light emitting portion, a light-passing control member, and a light receiving portion. The light-passing control member controls passing of the light from the light emitting portion. The light receiving portion outputs a light receiving signal based on the light received by the respective light receiving elements as detection signals representing detection results of the rotation by the rotator. A first virtual extended line that extends the first opening margin and a light-receiving-portion center line along the first direction passing through the respective light receiving elements at the light receiving portion pass through positions shifted from a rotational center of the light-passing control member. The light receiving portion is arranged such that the first virtual extended line corresponds to the light-receiving-portion center line, when the first opening margin passes through an optical path from the light emitting portion to the light receiving portion.

Methods and systems for testing a sensor of a propeller blade angle position feedback system are described. A sensor signal is received from a sensor at a known position relative to a feedback device, the feedback comprising a ring and at least one pair of position markers spaced from one another around a circumference thereof, the sensor configured for successively detecting passage of the position markers as the feedback device rotates at a known rotational speed and an axial distance between the sensor and the feedback device varies. From the sensor signal a measured position of the sensor relative to the feedback device and a measured rotational speed of the feedback device are determined. The measured position and the measured rotational speed are compared to the known position and the known rotational speed to determine a sensor accuracy.