Image forming apparatus having optical print head

An image forming apparatus, comprising:

• a photosensitive drum;
• an optical print head configured to expose the photosensitive drum;
• and
• a movement mechanism configured to move the optical print head from a retracted position that is apart from the photosensitive drum to an exposure position that is closer to the photosensitive drum than the retracted position, to expose the photosensitive drum,
• wherein the movement mechanism includes
• a sliding portion configured to be capable of sliding movement from another end side of the optical print head in a longitudinal direction of the optical print head to one end side of the optical print head in the longitudinal direction,
• wherein another end side of the sliding portion in the longitudinal direction is positioned upstream to one end side of the sliding portion in the longitudinal direction with respect to the sliding movement direction,
• a single first arm rotatably connected to the one end side of the sliding portion at a first connecting portion, and the one end side of the optical print head at a second connecting portion;
• a single second arm rotatably connected to the another end side of the sliding portion at a third connecting portion, and the another end side of the optical print head at a fourth connecting portion;
• wherein, such that the second connecting portion and the fourth connecting portion to move toward the photosensitive drum according to the rotation of the single first arm around the first connecting portion in conjunction with the movement of the first connecting portion moving toward the sliding movement direction together with the sliding portion, and according to the rotation of the single second arm around the third connecting portion in conjunction with the movement of the third connecting portion moving toward the sliding movement direction together with the sliding portion,
• (i) the second connecting portion supports the optical print head at a position downstream to the first connecting portion in the sliding movement direction, and at a position closer to the photosensitive drum than the first connecting portion,
• (ii) the fourth connecting portion supports the optical print head at a position downstream to the third connecting portion with in the sliding movement direction, and at a position closer to the photosensitive drum than the third connecting portion, and
• (iii) the movement mechanism comprises a contact portion configured to contact with the optical print head such that the movement of the optical print head in the sliding movement direction is restricted.