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US 5,473,415 AGranted
Image forming apparatus having a converter for image data characteristics
AssigneeCanon Kabushiki Kaisha
InventorsKimiyoshi Hayashi, Kenichi Suda, Kazuhiko Hirooka
Life of this patent
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Abstract
An image forming apparatus responsive to environmental conditions has an image forming device for forming a dot image on a recording member. The image forming device includes exposure apparatus for exposing the recording member. A detector detects a humidity condition of the apparatus, and control circuitry regulates the amount of light of the exposure apparatus in accordance with an output of the detector. The control circuitry is adapted, when the humidity detected by the detector is lower than a predetermined value, to select an amount of light of the exposure apparatus larger than that in the case where the humidity is higher than the predetermined value.
Claims31
An image forming apparatus comprising:
- plural process means each for effecting binary digitizing according to image data;
- image forming means for forming an image on a recording member according to the data released from said plural process means, comprising exposure means for exposing said recording member to light;
- switch means for switching the amount of light of said exposure means;
- and
- selector means for selecting one of said plural process means, corresponding to the switched amount of light, according to the switching operation of said switch means.
2 more elements
An image forming apparatus comprising:
- converter means for converting input digital image data according to conversion information;
- plural output means for releasing an image signal by applying a predetermined process to a signal corresponding to the thus-converted image data;
- exposure means for forming an image on a recording member according to said image signal;
- selector means for selecting one of said plural output means, said selector means comprising switch means for switching the energy of said exposure means, and said selector means being adapted to select said one of said plural output means in response to the function of said switch means;
- and
- control means for varying said conversion information according to the output means selected by said selector means.
3 more elements
An image forming apparatus comprising:
- converter means for converting input digital image data into a converted image data according to conversion information;
- output means for releasing the converted image data as an image signal;
- said output means comprising means for D/A conversion of said converted image data, means for generating an analog reference signal of a predetermined cycle period, and comparator means for comparing an analog image signal released from said D/A converter means with said analog reference signal to generate a pulse-width modulated signal;
- exposure means for forming an image on a recording member according to said image signal;
- switch means for switching the energy of said exposure means;
- and
- regulator means for regulating the image signal released from said output means, said regulator means being adapted to regulate a gain or offset level of said analog reference signal.
4 more elements
An image forming apparatus comprising:
- converter means for converting input digital image data according to conversion information;
- output means for releasing an image signal by selecting the thus-converted image data;
- exposure means for forming an image on a recording member according to said image signal;
- monitor means for monitoring gradation data by varying an image data level and image forming parameters;
- control means for varying said conversion information according to gradation data detected by said monitor means;
- and
- switch means for switching energy of said exposure means, and wherein said image forming parameter comprises the energy of said exposure means.
4 more elements
A color image forming apparatus comprising:
- input means for entering a color image signal;
- image forming means for performing an image formation of a plurality of colors including a half tone;
- means for generating pattern signals each related to plural steps of half tone on each of the plurality of colors;
- generating means for supplying the pattern signals to said image forming means;
- detecting means for detecting on a step basis levels of an image which have been formed by said image forming means in accordance with the pattern signal supplied from said generating means;
- and
- correcting means for correcting the color image signal entered from said input means on each color in accordance with a detection result by said detecting means and for supplying the corrected signals to said image forming means, wherein said correcting means includes a reference table for storing output values to the color image signal entered from said input means, and varies the output value to be read out from said reference table in accordance with a detection result of said detecting means.
4 more elements
An image forming apparatus, comprising:
- converter means for converting input digital image data in accordance with conversion formation;
- output means for applying a predetermined process to a signal corresponding to the thus-converted image data and outputting the processed signal as an image signal;
- exposure means for forming an image on a recording medium in accordance with the image signal;
- detector means for detecting an environmental condition;
- switching means for switching an energy of said exposure means according to an output of said detector means;
- and
- control means for varying the conversion information of said converter means in accordance with the output of said detector means.
4 more elements
Dependencies are inferred from the claim text.