Image forming apparatus

An image forming apparatus comprising:

• a transporter that transports a recording medium through a conveyance path;
• an image former that forms an image on the recording medium based on image data;
• a reflective optical sensor for image density adjustment;
• a circuit configured to adjust image density based on detection result of the reflective optical sensor;
• and
• a controller,
• wherein
• the image former includes:
• a photoreceptor;
• a charger that charges the photoreceptor in contact with the photoreceptor;
• an exposer that forms an electrostatic latent image on the photoreceptor;
• a developer that supplies toner to the photoreceptor to form a toner image corresponding to the electrostatic latent image;
• a transferer that transfers the toner image to the recording medium;
• and
• a fuser that heat-fixes the toner image on the recording medium by a fusing roller,
• the reflective optical sensor is fixedly provided opposite to the photoreceptor across the conveyance path so as to irradiate with light a position away from a center line of the paper sheet conveyance path by a predetermined distance in a main scanning direction, and the recording medium blocks light from the reflective optical sensor only when a width in the main scanning direction of the recording medium is longer than a predetermined reference length,
• during image density adjustment, the controller controls the charger, the exposer, and the developer to form a predetermined patch toner image on the photoreceptor, controls the reflective optical sensor to irradiate the patch toner image with light, and control the circuit configured to adjust image density based on reflected light from the patch toner image,
• during image forming, the controller controls the transporter and the reflective optical sensor to cause the reflective optical sensor to emit light on timing that a predetermined leading edge area of the recording area passes, and decides based on reflected light therefrom whether the width in the main scanning direction of the recording medium is longer than the predetermined reference length.