DEVICE FOR DETECTING STATE OF DISCHARGED LIQUID DROPLET AND IMAGE-FORMING APPARATUS INCLUDING THE SAME

摘要

A device for detecting a state of a discharged liquid droplet includes a plurality of nozzles which is arranged in a width direction of a recording medium orthogonal to a feeding direction of the recording medium to discharge a liquid droplet toward the recording medium, a light emitter which is provided on one side of the recording medium in the width direction orthogonal to the feeding direction of the recording medium, and a light receiver which is provided on the other side of the recording medium in the width direction, wherein the light emitter includes a light-emitting element, a condenser lens which condenses light from the light-emitting element to emit as a light beam, and an aperture stop member including an aperture opening through which the light beam passes.

主权项

1. A device for detecting a state of a discharged liquid droplet comprising:
a plurality of nozzles which is arranged in a width direction of a recording medium orthogonal to a feeding direction of the recording medium to discharge a liquid droplet toward the recording medium; a light emitter which is provided on one side of the recording medium in the width direction orthogonal to the feeding direction of the recording medium; and a light receiver which is provided on the other side of the recording medium in the width direction, wherein the light emitter includes a light-emitting element, a condenser lens which condenses light from the light-emitting element to emit as a light beam, and an aperture stop member including an aperture opening through which the light beam passes, the aperture opening has a rhombic shape or a rectangular shape, and a light-receiving surface of the light-receiving element is displaced in the feeding direction of the recording medium, and is displaced on extension lines of diagonal lines of the light beam of the rhombic shape or the rectangular shape of which a contour is defined through the rhombic or rectangular aperture opening.