Patent ID: 7729627

Claim:
An image forming apparatus, comprising: a concentrated toner tank, adapted to store a concentrated toner; a carrier liquid tank, adapted to store a carrier liquid; a development device, separated from the concentrated toner tank and the carrier liquid tank, to which a liquid toner supplied from the concentrated toner tank and the carrier liquid tank is supplied, and which has a developer causing the liquid toner to adhere onto an image carrier to develop an electrostatic latent image formed on the image carrier as a toner image, and has a supply roller formed with a groove adapted to accommodate the liquid toner and operable to supply the liquid toner to the developer; a reflector that is a part of the supply roller, not having the groove; and a reflective photo sensor that has a light emitter operable to emit light to the reflector through the liquid toner and has a light receiver operable to receive the light reflected by the reflector through the liquid toner.