Pin display apparatus, pin display system

A pin display device comprising a housing and a plurality of pins,

• the pin display device being used as a pin display system such that a direction in which at least gravity acts is set as a negative direction of a z direction, and a lower surface of the housing is brought into contact with or into proximity to an upper surface that is one surface of a magnetic sheet,
• wherein
• the housing includes the lower surface of the housing that is a plane perpendicular to the z direction, an upper surface of the housing that is in a positive direction of the z direction with respect to the lower surface of the housing, and a same number of pin insertion holes as the pins,
• each of the pin insertion holes is a hole into which the pin is inserted from the upper surface of the housing,
• the same number of pin insertion holes as the pins have different positions in a plane perpendicular to the z direction,
• a material of the housing is a material that does not block or reduce a magnetic force line, does not control a path of a magnetic force line, and does not generate a magnetic force line,
• each of the pins is provided at one end with a pot magnet with an opening of a container facing outward, and is inserted into the pin insertion hole with the end provided with the pot magnet facing the negative direction of the z direction,
• each of the pot magnets emits a magnetic field capable of moving the pin including the pot magnet in the positive direction of the z direction by a repulsive force due to a magnetic force generated between the pot magnet and the upper surface of the magnetic sheet in a state where the pin including the pot magnet is inserted into the pin insertion hole,
• an interval between adjacent pin insertion holes is equal to or greater than a shortest distance at which a magnetic force generated with respect to the pot magnet of the pin inserted into the adjacent pin insertion hole does not affect movement of the pins, and
• a gap having a length in the z direction equal to or greater than a shortest distance in which at which rewriting of a magnetic sheet of a same type as the magnetic sheet does not occur due to a magnetic field emitted by a pot magnet that emits a same magnetic field as the pot magnet is provided between a bottom of the pin insertion hole and the lower surface of the housing.