A power supply for inductively powering a remote device has an inverter operating at an operating frequency and a primary coil. The second electrode includes material selected from the group consisting of silver, copper, zinc, gold, titanium, nickel, cobalt, tantalum, aluminum, and bismuth, alloys thereof, and silicides thereof. The image forming apparatus includes a controller that is operable to compensate ejection timings of ink droplets to be ejected from the nozzles onto the print medium based on ejection density of the ink droplets. Each design of the plurality of designs is evaluated. Such calibration is critical in a QKD system, where the average number of photons per pulse needs to be very small\u2014i. The driving portion of the driving member drives the two connecting bars to urge the stopping portions to disengage from the protrusions when the driving member is driven.