Image Forming Device and Detachable Process Unit

A drum cartridge that is detachably loadable in an image forming device, comprising:

• a photosensitive drum on which an electrostatic latent image is formable;
• a casing that rotatably supports the photosensitive drum, the casing detachably accommodating a developing cartridge including a developing roller, the developing roller supplying developer to the photosensitive drum when the developing cartridge is mounted on the casing;
• a pressing member provided on the casing, the pressing member being movable between a first position and a second position, the pressing member being in the first position when the developing cartridge is removed from the casing, the pressing member being in the second position when the developing cartridge is mounted on the casing, the pressing member pressing the developing roller against the photosensitive drum in the second position;
• and
• a light path forming member including an incident surface, an output surface and a guide member, the guide member directing light incident on the incident surface toward the output surface, the output surface outputting the light coming from the incident surface to outside of the casing when the pressing member is in the second position.

A drum cartridge that is detachably loadable in an image forming device, comprising:

• a photosensitive drum on which an electrostatic latent image is formable;
• a casing that rotatably supports the photosensitive drum, the casing detachably accommodating a developing cartridge including a developing roller, the developing roller supplying developer to the photosensitive drum when the developing cartridge is mounted on the casing;
• and
• a pressing member that is provided on the casing, the pressing member being movable between a first position and a second position, the pressing member being in the first position when the developing cartridge is removed from the casing, the pressing member being in the second position when the developing cartridge is mounted on the casing, the pressing member pressing the developing roller against the photosensitive drum in the second position, the pressing member including a light blocking portion that blocks light when the pressing member is in the second position.