Print head and image forming apparatus
AssigneesToshiba Tec Kabushiki Kaisha, Futaba Corporation
InventorKoji Tanimoto
Life of this patent
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Abstract
According to an embodiment, a print head includes one or more light emitting element arrays, a light emission control circuit, and one or more drive circuit arrays. The light emitting element arrays include a plurality of light emitting elements arrayed continuously along a main scanning direction. The light emission control circuit outputs drive signals of different phases in units of a light emitting element group configured by a predetermined number of continuous light emitting elements included in the light emitting elements. The drive circuit arrays include a plurality of drive circuits, the drive circuits cause the light emitting elements to emit light individually based on the drive signals.
Claims20
A print head for an image forming apparatus, comprising:
- one or more light emitting element arrays including a plurality of light emitting elements arrayed continuously along a main scanning direction;
- a light emission control circuit configured to output drive signals of different phases for each light emitting element group including a predetermined number of continuous light emitting elements included in the light emitting elements;
- and
- one or more drive circuit arrays including a plurality of drive circuits configured to cause the light emitting elements to emit light individually based on the drive signals,
- wherein the image forming apparatus comprises a photoreceptor that moves in a sub-scanning direction and on which a latent image is exposed by light emission of the light emitting elements, and
- a relation S>V+T1 is satisfied, where T1 is a phase difference between drive signals of two adjacent light emitting element groups, S is a size of the light emitting elements in the sub-scanning direction, and V is a velocity of the photoreceptor in the sub-scanning direction.
An image forming apparatus comprising:
- one or more light emitting element arrays including a plurality of light emitting elements arrayed continuously along a main scanning direction;
- a light emission control circuit configured to output drive signals of different phases for each light emitting element group including a predetermined number of continuous light emitting elements included in the light emitting elements;
- one or more drive circuit arrays including a plurality of a drive circuits configured to cause the light emitting elements to emit light individually based on the drive signals;
- and
- a photoreceptor that moves in a sub-scanning direction and on which a latent image is exposed by light emission of the light emitting elements,
- wherein a relation S>V×T1 is satisfied, where T1 is a phase difference between drive signals of two adjacent light emitting element groups, S is a size of the light emitting elements in the sub-scanning direction, and V is a velocity of the photoreceptor in the sub-scanning direction.
Dependencies are inferred from the claim text.