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US 5,687,002 AGranted
Image forming apparatus with a solid-state scanning optical print head
AssigneeMinolta Co., Ltd.
InventorTetsuya Itoh
Life of this patent
Estimating the term…
Abstract
An image forming apparatus with a solid-state scanning optical print head reproduces tones by an intensity modulation method, corrects light dispersion of each element by a pulse modulation method, and corrects fluctuations in sensitivity characteristics of a photosensitive member by switching the drive current value of maximum light exposure.
Claims5
An apparatus for forming images by exposing a surface of a photosensitive member, said apparatus comprising:
- an optical print head having a plurality of elements for exposing the surface of the photosensitive member;
- means for respectively generating drive signals for each element by digital-to-analog conversion of individual tone data specifying an amount of exposure for each said element;
- means for respectively generating control signals specifying a light emission time period of each element based on correction data for unifying light output characteristics of each said element;
- means for respectively outputting drive current for each element by effectualizing the drive signals of each said element for a time period specified by the control signal of each said element;
- means for detecting an amount of physical influence on photosensitivity characteristics of the photosensitive member;
- and
- means for setting an amplitude of said drive current in accordance with an amount of physical influence detected by said means for detecting.
4 more elements
An apparatus for forming an electrostatic latent image on a photosensitive member by exposing a surface thereof, said apparatus comprising:
- a print head having a plurality of optical elements;
- a register which fetches individual tone data specifying an amount of exposure for each said element;
- a plurality of D/A converters, each converter corresponding to a respective one of said elements, each converter converting a respective one of said individual tone data outputted from said register to analog signals;
- a plurality of transistors, each transistor corresponding to a respective one of said elements, each transistor outputting respective analog signals to each element for a time period specified by a control signal of a respective element;
- a plurality of amplifiers, each of which is provided between a respective one of said transistors and a respective one of said elements and which amplifies the respective analog signal;
- a sensor which detects temperature;
- and
- a switch which sets an amplitude of said amplifiers in accordance with a temperature detected by said sensor.
5 more elements
Dependencies are inferred from the claim text.