Recording head and image forming apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorsYukihiko Sakashita, Akihiro Matsushita
Life of this patent
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Abstract
A recording head includes a light emitting element array comprised of a plurality of light emitting elements and a plurality of switch elements for scanning the plurality of light emitting elements, and a drive device for driving the light emitting element array. The drive device has a variable resistor in a route for supplying a driving current to the plurality of switch elements. The control voltage of the variable resistor is varied to thereby adjust the driving current for the plurality of switch elements.
Claims6
A recording head comprising:
- a light emitting element array comprising a plurality of light emitting elements and a plurality of switch elements, said plurality of switch elements scanning said plurality of light emitting elements;
- and
- a drive device, said drive device driving said light emitting element array, said drive device having a variable resistor in a route for supplying a driving current to said plurality of switch elements,
- wherein a control voltage of said variable resistor is varied to thereby adjust the driving current for said plurality of switch elements.
A recording head comprising:
- a light emitting element array comprising a plurality of light emitting elements and a plurality of switch elements, said plurality of switch elements scanning said plurality of light emitting elements;
- a drive device, said drive device driving said light emitting element array, said drive device supplying a driving current to said plurality of light emitting elements, said drive device comprising an output circuit for outputting the driving current, said output circuit including an internal resistor;
- and
- an external resistor provided in a route for supplying the driving current from said drive device to said plurality of light emitting elements,
- wherein a resistance value of said internal resistor is smaller than a resistance value of said external resistor.
An image forming apparatus comprising:
- a light emitting element array comprising a plurality of light emitting elements and a plurality of switch elements, said plurality of switch elements scanning said plurality of light emitting elements;
- a drive device, said drive device driving said light emitting element array, said drive device having a variable resistor element in a route for supplying a driving current to said plurality of switch elements;
- and
- a photosensitive medium on which recording is effected by said light emitting element array,
- wherein a control voltage of said variable resistor element is varied to thereby adjust the driving current for said plurality of switch elements.
An image forming apparatus comprising:
- a light emitting element array comprising a plurality of light emitting elements and a plurality of switch elements, said plurality of switch elements scanning said plurality of light emitting elements;
- a drive device, said drive device driving said light emitting element array, said drive device supplying a driving current to said plurality of light emitting elements, said drive device comprising an output circuit for outputting the driving current, said output circuit including an internal resistor;
- an external resistor provided in a route for supplying the driving current from said drive device to said plurality of light emitting elements;
- and
- a photosensitive medium on which recording is effected by said light emitting element array,
- wherein a resistance value of said internal resistor is smaller than a resistance value of said external resistor.
Dependencies are inferred from the claim text.