US 4,905,023 A · Image forming apparatus including digital image signal input means

Abstract

An image forming apparatus includes a digital image signal input, and image former for forming an image of predetermined elements on a recording medium by scanning a recording medium in response to the digital image signal in first and second scanning directions, and a corrector for correcting the size of the predetermined elements in different first or second modes in relation to the first and second directions. Also provided are a generator for generating a recording beam to irradiate the recording medium, and a modulator for modulating the recording beam in response to the digital image signal. The corrector corrects the intensity of the recording beam and the irradiation duration thereof. A converter converts characteristics of the digital image signal and outputs the converted digital image signal. The converter includes a plurality of tables employed to perform the conversion. A processor processes the outputted converted digital image signal and generates a pulse-width modulated signal on the basis of the level of the converted digital image signal. A discriminator discriminates whether the input digital image signal represents a thin line image or an edge image and selects one of the tables in accordance with the discrimination results.

Claims19

Dependent claims

An image forming apparatus comprising:

digital image signal input means;
image forming means for forming an image for each of predetermined elements by scanning a recording medium in response to the digital image signal entered through said input means, said image forming means being capable of scanning said recording medium in first and second scanning directions for image formation,
said image forming means including means for forming a pulse-width modulated signal on the basis of the level of the digital image signal entered through said input means;
and
means for correcting the size of at least one of the predetermined elements formed on said recording medium in first and second modes in relation to the first and second scanning directions, said first and second modes being different from each other,
wherein in said first mode said correcting means corrects the pulse width of the pulse-width modulated signal.

3 more elements

A beam recording apparatus comprising:

digital image signal input means;
means for generating a recording beam to irradiate a recording medium for image formation;
modulating means for modulating the recording beam in response to the digital image signal entered from said input means,
wherein said modulating means includes means for forming a pulse-width modulated signal in accordance with the level of the digital image signal entered through said input means, and for modulating the recording beam on the basis of the pulse-width modulated signal;
and
correcting means for correcting the intensity of said recording beam and the irradiation duration thereof.

3 more elements

Dependencies are inferred from the claim text.

Image forming apparatus including digital image signal input means

Life of this patent

Image forming apparatus including digital image signal input means

Life of this patent

Abstract

Claims19