Illuminating device, image reading device, and image forming device including the illuminating device and the image reading device

摘要

In an image forming device, a light-guiding member includes an integrated ridge extending in the longitudinal direction of the light-guiding member. The light-guiding member further includes a protrusion on the ridge. The illuminating device includes an attachment recess that holds the light-guiding member and a holder member that has a fit portion to which a protrusion is fitted. The protrusion is disposed at a position decentered to one end portion of the light-guiding member in the longitudinal direction of the light-guiding member.

主权项

1. An illuminating device, comprising:
a light-emitting device that emits light; a light-guiding member that guides the light from the light-emitting device inside thereof and that includes a light emerging surface from which the light is thrown on a subject, the light emerging surface extending in a longitudinal direction of the light-guiding member, wherein the light-guiding member includes: a ridge integrally provided together with the light-guiding member as a single monolithic element, the ridge extending in the longitudinal direction, extending farther in a radial direction of the light-guiding member than remaining portions of the light-guiding member, and protruding from a surface of the light-guiding member, and a protrusion which is present on only a portion of the ridge and extends farther in a radial direction of the ridge than remaining portions of the ridge; an attachment recess which holds the light-guiding member; and a holder member which includes a fit portion to which the protrusion is fitted.