| 摘要 |
An image forming apparatus includes at least one image bearing member (40), a transport mechanism (10), a scale (70), and a scale reading mechanism (71). The at least one image bearing member (40) bears a toner image on a surface thereof. The transport mechanism (10) has inner and outer surfaces and transports the toner image. The inner surface is tensioned by a plurality of rollers (14,15,16) and the outer surface receives the toner image from the at least one image bearing member (40). The scale (70) includes a plurality of marks. The plurality of marks include an aluminum thin film having a ladder-shaped scale pattern, are arranged around the inner surface of the transport mechanism (10), and are aligned at predetermined intervals in a moving direction of the transport mechanism. The scale reading mechanism (71) includes a magnetometric sensor to magnetometrically read the plurality of marks forming the scale. <IMAGE> |
