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US 5,212,504 AGranted
Image forming apparatus employing LED printing head
AssigneeMita Industrial Co., Ltd.
InventorsAkihiro Takada, Akihiro Kondou
Life of this patent
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Abstract
In an image forming apparatus, a latent image is formed on a photoreceptor by an LED printing head based on image information. The latent image is developed into a toner image by a developing apparatus, to which a developing bias voltage is applied. The developing bias voltage is controlled according to a temperature of the LED printing head sensed by a temperature sensor so that a toner density of a toner image formed by the developing apparatus is appropriate.
Claims6
An image forming apparatus comprising:
- a photoreceptor;
- charging means for forming a charged portion on said photoreceptor;
- an LED printing head for forming a latent image by irradiating light on the charged portion formed on said photoreceptor based on image information, said LED printing head comprising a plurality of light emitting diodes;
- developing apparatus for developing the latent image formed on said photoreceptor into a toner image;
- voltage applying means for applying a developing bias voltage to said developing apparatus;
- temperature sensing means for sensing a temperature of said LED printing head;
- and
- controlling means for changing a developing bias voltage applied to the developing apparatus by said voltage applying means according to a temperature of the LED printing head, sensed by said temperature sensing means so that a toner density of a toner image formed by said developing apparatus is appropriate.
5 more elements
An image forming apparatus comprising:
- a photoreceptor;
- charging means for forming a charged portion on said photoreceptor;
- pulse voltage supplying means;
- an LED printing head for forming a latent image by irradiating light on the charged portion formed on said photoreceptor when a pulse voltage is applied, said LED printing head comprising a plurality of light emitting diodes;
- a developing apparatus for developing the latent image formed on said photoreceptor into a toner image;
- voltage applying means for applying a developing bias voltage to said developing apparatus;
- temperature sensing means for sensing a temperature of said LED printing head;
- and
- controlling means for changing a developing bias voltage applied to the developing apparatus by said voltage applying means so that an operation duration of said LED printing head decreases and a toner density of the toner image formed by said developing apparatus improves when a temperature of the LED printing head sensed by said temperature sensing means exceeds a predetermined temperature.
6 more elements
Dependencies are inferred from the claim text.