Abstract:
A recording sheet characteristics sensing device includes: a transmitted-light source that emits light onto a principal surface of a recording sheet being conveyed; a transmitted-light quantity detector that measures a quantity of transmitted light having passed through the recording sheet, the transmitted light being of the light emitted by the transmitted-light source; a transmitted-light diaphragm that has a diaphragm hole and limits the transmitted light entering the transmitted-light quantity detector to the transmitted light having passed through the diaphragm hole; and a sensor that senses characteristics of the recording sheet being conveyed, using the quantity of transmitted light detected by the transmitted-light quantity detector, wherein the diaphragm hole is narrower in a conveying direction than in a direction perpendicular to the conveying direction.
Abstract:
An image forming apparatus acquires front and back images to be formed on paper and divides the front and back images of paper into a first image formed a part of the front image, a second image formed of the remaining part of the front image and a part of the back image, and a third image formed of the remaining part of the back image. The image forming apparatus forms the first and second images on the paper folded at the first position, and forms the third image on the paper folded at the second position. The image forming apparatus forms the first to third images such that the part of the front image and the remaining part of the front image constitute the front image and the part of the back image and the remaining part of the back image constitute the back image when the paper is unfolded.