Optical sensor, scanner unit, and image forming apparatus

A scanner unit comprising:

• a light emission element;
• a mirror configured to reflect light emitted from the light emission element;
• and
• an optical sensor configured to detect the light reflected by the mirror,
• the optical sensor including
• a circuit board,
• a bare chip mounted on the circuit board,
• a protection member configured to protect the bare chip,
• a pad connected to the bare chip via a wire, and
• a pattern connecting the pad and a terminal portion at an edge of the circuit board to each other,
• wherein the pattern is connected to the terminal portion on a same surface as a surface on which the bare chip is mounted, and a portion of the pattern between the protection member and the terminal portion is covered with solder resist.

An image forming apparatus comprising:

• an image bearing member configured to allow an image to be formed thereon;
• a scanner unit configured to irradiate the image bearing member with light to form a latent image on the image bearing member,
• the scanner unit including
• a light emission element,
• a mirror configured to reflect the light emitted from the light emission element, and
• an optical sensor configured to detect the light reflected by the mirror,
• the optical sensor including
• a circuit board,
• a bare chip mounted on the circuit board,
• a protection member configured to protect the bare chip,
• a pad connected to the bare chip via a wire, and
• a pattern connecting the pad and a terminal portion at an edge of the circuit board to each other,
• wherein the pattern is connected to the terminal portion on a same surface as a surface on which the bare chip is mounted, and a portion of the pattern between the protection member and the terminal portion is covered with solder resist;
• a development unit configured to develop the latent image formed on the image bearing member;
• and
• a transfer unit configured to transfer an image developed by the development unit onto a sheet.