Image forming apparatus having a printhead guide and locking mechanism

An image forming apparatus comprising:

• a photoreceptor configured to rotate around a predetermined rotational axis;
• an exposing member configured to expose the photoreceptor, the exposing member having a plurality of blinking portions aligned parallel to the predetermined rotational axis of the photoreceptor;
• a positioning member configured to contact the exposing member at a downstream side of a rotational direction of the photoreceptor relative to the exposing member;
• and
• a pressing member configured to press the exposing member toward both the photoreceptor and the positioning member, said pressing induces at least two forces,
• wherein a first force of the at least two forces is directed in a substantially vertical direction and a second force of the at least two forces is directed in a substantially horizontal direction.

An image forming apparatus comprising:

• a photosensitive drum configured to be rotatable around a predetermined rotational axis;
• an exposing member having a plurality of blinking portions aligned parallel to the predetermined rotational axis of the photosensitive drum, the exposing member being configured to expose the photosensitive drum;
• a spacing member configured to maintain a constant distance between the photosensitive drum and the exposing member;
• a positioning member substantially parallel to an optical axis of the exposing member configured to contact the exposing member at a downstream side of the rotational direction of the photosensitive drum relative to the exposing member;
• and
• a pressing member configured to press the exposing member toward the photosensitive drum and into a substantially vertical surface of the positioning member.