Spectral characteristic measuring device and image forming apparatus

A spectral characteristic measuring device, comprising:

• an illuminating unit configured to illuminate a medium;
• a light dividing unit configured to divide reflection light from the medium into plural reflection light beams;
• a first imaging unit configured to focus the respective reflection light beams;
• a diffraction unit configured to diffract the focused reflection light beams to form diffraction images;
• and
• a light receiving unit including plural pixels configured to receive the diffraction images,
• wherein the first imaging unit includes first lenses and second lenses that are arranged alternately in a staggered pattern;
• wherein the diffraction unit includes a first diffraction region and a second diffraction region;
• and
• wherein the spectral characteristic measuring device is configured such that
• the reflection light beams focused by the first lenses enter the first diffraction region to form first diffraction images of the diffraction images,
• the reflection light beams focused by the second lenses enter the second diffraction region to form second diffraction images of the diffraction images, and
• the first diffraction images and the second diffraction images are arranged alternately on the light receiving unit in a pixel arrangement direction in which the pixels are arranged.