摘要:
Disclosed is a traveling state determining device including an acceleration sensor which detects an acceleration, a cycle comparing unit which compares a varying cycle of an acceleration of a vertical direction component in an output of the acceleration sensor to a varying cycle of an acceleration of a horizontal direction component and a state determining unit which determines between a state where a user is walking or running by wearing or retaining the traveling state determining device on a body of the user and a state where the user is walking or running by holding the traveling state determining device in a hand of the user based on the comparing result of the cycle comparing unit.
摘要:
By forming an outer wall over a space around an ink storage chamber of an ink cartridge or by providing convexities arranged at intervals of not more than 10 mm on an outer surface of a housing which forms the ink storage chamber, a possible ink recharging hole provided in the housing is prevented from being sealed. Different kinds of ink cartridges are manufactured which have different inner compositions which cannot be discriminated in appearance. Any desired ink cartridges are selected randomly from those manufactured ones and shipped. This prevents the user from recharging any one of the ink cartridges with an ink from an unreliable source through a possible hole formed in the wall of the ink cartridge to thereby prevent a print head and/or printer from malfunctioning.