A toner level detector includes a toner cartridge, an agitator, a reflective region, a first cleaner, a second cleaner and a transceiver. The toner cartridge stores toner, and has a light-permeable region. The agitator rotatably disposed in the toner cartridge agitates the toner. The reflective region is disposed on the agitator. The first cleaner is disposed on the agitator. The second cleaner is disposed on the toner cartridge. The transceiver disposed on a body outside the toner cartridge outputs an emitting signal to the reflective region through the light-permeable region. The reflective region reflects the emitting signal to generate a reflective signal received by the transceiver through the reflective region. The rotating first cleaner intermittently cleans the fixed light-permeable region, and the fixed second cleaner intermittently cleans the rotating reflective region.

An image forming apparatus including a photosensitive member, an optical scanning device including a transmission member configured to cause laser light for scanning the photosensitive member to pass through the transmission member, and a developing device configured to develop an electrostatic latent image with toner, the electrostatic latent image being scanned by the laser light and formed on the photosensitive member; a cleaning mechanism configured to clean the transmission member; a counter configured to store a count value that is a number of sheets on which an image forming operation is performed, and a control unit which executes a cleaning sequence before execution of an adjustment sequence, and resets the count value upon execution of the cleaning sequence, in a case where the count value is less than or equal to a predetermined value.

A toner level detector, includes: a toner cartridge storing toner and having one side provided with a light-permeable region; an agitator, which is rotatably disposed in the toner cartridge and agitates the toner; a reflective region disposed on an inner surface on the other side of the toner cartridge; a first cleaner disposed on one side of the agitator; a second cleaner disposed on the other side of the agitator; and a transceiver, which is disposed on a body outside the toner cartridge, and outputs an emitting signal to the reflective region through the light-permeable region, wherein the reflective region reflects the emitting signal to generate a reflective signal received by the transceiver through the reflective region, wherein the first cleaner, which is rotating, intermittently cleans the light-permeable region, which is fixed; and the second cleaner, which is rotating, intermittently cleans the reflective region, which is fixed.

An image forming apparatus includes an apparatus body, an image bearing member, and a process unit attached to the apparatus body. The process unit includes a frame including a storage portion configured to store developer, a developer bearing member configured to supply developer to the image bearing member to develop an electrostatic latent image. and a circuit board attached to the frame. The circuit board includes a light emitting portion configured to emit light, and a light receiving portion configured to receive the light emitted from the light emitting portion and having passed through an interior of the storage portion.

A toner level detector includes a toner cartridge, an agitator, a reflective region, a first cleaner, a second cleaner and a transceiver. The toner cartridge stores toner, and has a light-permeable region. The agitator rotatably disposed in the toner cartridge agitates the toner. The reflective region is disposed on the agitator. The first cleaner is disposed on the agitator. The second cleaner is disposed on the toner cartridge. The transceiver disposed on a body outside the toner cartridge outputs an emitting signal to the reflective region through the light-permeable region. The reflective region reflects the emitting signal to generate a reflective signal received by the transceiver through the reflective region. The rotating first cleaner intermittently cleans the fixed light-permeable region, and the fixed second cleaner intermittently cleans the rotating reflective region.

An image forming apparatus including a photosensitive member, an optical scanning device including a transmission member configured to cause laser light for scanning the photosensitive member to pass through the transmission member, and a developing device configured to develop an electrostatic latent image with toner, the electrostatic latent image being scanned by the laser light and formed on the photosensitive member; a cleaning mechanism configured to clean the transmission member; a counter configured to store a count value that is a number of sheets on which an image forming operation is performed, and a control unit which executes a cleaning sequence before execution of an adjustment sequence, and resets the count value upon execution of the cleaning sequence, in a case where the count value is less than or equal to a predetermined value.

An image forming apparatus includes an apparatus body, an image bearing member, and a process unit attached to the apparatus body, the process unit including a frame including a storage portion configured to store developer, a developer bearing member configured to supply developer to the image bearing member to develop an electrostatic latent image; and a circuit board attached to the frame, wherein the circuit board includes a light emitting portion configured to emit light, and a light receiving portion configured to receive the light emitted from the light emitting portion and having passed through an interior of the storage portion.

A developer supplying device has a storage container, a detection sensor, and a cleaning member. The storage container stores developer. The detection sensor has a detection face making contact with the developer in the storage container and detects the amount of developer in the storage container. The cleaning member cleans the detection face by making contact with the detection face. The storage container has a sensor movement face formed arc-shaped about a predetermined center as seen in a sectional view. The detection sensor is configured to be movable in the up/down direction along the sensor movement face. The cleaning member rotates about the predetermined center as a rotation axis.

An image forming apparatus according to an embodiment may include a control section that controls operation of the image forming unit; a driving source that drives the image forming unit and drives, based on an instruction of the control section, rotation of a cleaning member whose sliding member passes a gap between a first light transmission window of a first optical path and a second light transmission window of a second optical path in a developer storing section while sliding on the first light transmission window and the second light transmission window. The control section detects, based on a light reception information detected by a light receiving element, a passage timing at which the sliding member passes through the gap, and stops the driving by the driving source based on the passage timing.

An image forming apparatus according to an embodiment may include a control section that controls operation of the image forming unit; a driving source that drives the image forming unit and drives, based on an instruction of the control section, rotation of a cleaning member whose sliding member passes a gap between a first light transmission window of a first optical path and a second light transmission window of a second optical path in a developer storing section while sliding on the first light transmission window and the second light transmission window. The control section detects, based on a light reception information detected by a light receiving element, a passage timing at which the sliding member passes through the gap, and stops the driving by the driving source based on the passage timing.