Abstract: A network quality measurement method and system are provided. In the method, a movement path and a movement speed of a vehicle device are determined according to a size of a space and an endurance time of the vehicle device, and the vehicle device is controlled to move on the movement path at the movement speed. During a movement of the vehicle device, a network quality in the space is measured according to a measurement frequency to generate network quality data. Whether the network quality in the space is changed is determined according to the network quality data. Whether there is an obstacle around the vehicle device is detected. When it is determined that the network quality in the space is changed or the obstacle is detected around the vehicle device, at least one of the movement path, the movement speed, and the measurement frequency is adjusted.

Abstract: A lens device includes a focus lens unit mounted movably to a base, first and second lens units mounted in a main barrel, and a resilient light blocking sheet connected to the focus driving unit. The first and second lens units are movable in the in the main barrel along the axis between an extended position, where the first and second lens units cooperatively define a second gap therebetween, through which light passes and is reflected by the main barrel toward a first gap between the focus lens unit and the focus driving unit, and where the light blocking sheet spans the first gap so as to block passage of the light through the first gap, and a retracted position, where the second lens unit extends into the first gap and causes the light blocking sheet to flex.

Abstract: A lens device includes a focus lens unit mounted movably to a base, a focus driving unit for driving movement of the focus lens unit, first and second lens units mounted in a main barrel, and a resilient light blocking sheet connected to the focus driving unit. The first and second lens units are movable in the main barrel along the axis between an extended position, where the first and second lens units cooperatively define a second gap therebetween, through which light passes and is reflected by the main barrel toward a first gap between the focus lens unit and the focus driving unit, and where the light blocking sheet spans the first gap so as to block passage of the light through the first gap, and a retracted position, where the second lens unit extends into the first gap and causes the light blocking sheet to flex.