Lens array and line head

An image forming apparatus comprising:

• at least two image forming stations each of which has a charging unit, a line head, a developing unit, and a transfer unit disposed around an image carrier, wherein
• the line head comprises:
• a lens array comprising:
• a lens array substrate having a light transmissive property;
• a first lens disposed on the lens array substrate;
• and
• a second lens disposed on the lens array substrate in a first direction from the first lens and different from the first lens in peripheral shape, and
• a head substrate having a plurality of light emitting elements arranged and adapted to emit light to be imaged by the lenses, and
• tandem-type image formation is performed by causing a transfer medium to pass through each station.

An image forming apparatus comprising:

• an image carrier on which is formed a latent image;
• a charging unit that charges the image carrier;
• a line head that forms the latent image on the image carrier and comprises:
• a lens array comprising:
• a lens array substrate having a light transmissive property;
• a first lens disposed on the lens array substrate;
• and
• a second lens disposed on the lens array substrate in a first direction from the first lens and different from the first lens in peripheral shape, and
• a head substrate having a plurality of light emitting elements arranged and adapted to emit light to be imaged by the lenses;
• a developing unit that develops the latent image;
• and
• a transfer unit that transfers an image developed by the developing unit onto a transfer medium.