Exposure device for an electrophotographic apparatus
First Claim
Patent Images
1. An exposure device for an electrophotographic apparatus comprising:
- one or more laser light sources which expose an image carrier in accordance with a print information signal supplied from an external information processing apparatus;
a resolution switching lens; and
a switching unit to switch between a low resolution and a high resolution of an image to be formed by inserting and extracting the resolution switching lens into and from a laser optical path,wherein a light emission time of each of the laser light sources with respect to a resolution of the print information signal is changeable, andwherein the light emission time of the laser light source with respect to the print information signal is set to a value by which vertical and lateral widths of each latent image dot on said image carrier are equal to each other.
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Abstract
An exposure device for an electrophotographic apparatus including one or more laser light sources which expose an image carrier in accordance with a print information signal supplied from an external information processing apparatus, a resolution switching lens, and a switching unit to switch over a low resolution and a high resolution by inserting and extracting the resolution switching lens into and from a laser optical path. Preferably, a light emission time of each of the laser light sources with respect to the print information signal is changeable.
22 Citations
14 Claims
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1. An exposure device for an electrophotographic apparatus comprising:
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one or more laser light sources which expose an image carrier in accordance with a print information signal supplied from an external information processing apparatus; a resolution switching lens; and a switching unit to switch between a low resolution and a high resolution of an image to be formed by inserting and extracting the resolution switching lens into and from a laser optical path, wherein a light emission time of each of the laser light sources with respect to a resolution of the print information signal is changeable, and wherein the light emission time of the laser light source with respect to the print information signal is set to a value by which vertical and lateral widths of each latent image dot on said image carrier are equal to each other. - View Dependent Claims (2, 3, 4, 5)
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6. An exposure device, comprising:
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a light source for exposing an image carrier; and a switching unit that switches between resolutions, wherein said light source has a first light emission time for a first resolution and a second light emission time for a second resolution, which is different from said first resolution, and wherein at least one of the first light emission time and said second light emission time of the laser light source with respect to the print information signal is set to a value by which vertical and lateral widths of each latent image dot on said image carrier are equal to each other. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An exposure device for an electrophotographic apparatus comprising:
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means for exposing an image carrier in accordance with a print information signal supplied from an external information processing apparatus; and means for switching between a low resolution and a high resolution of an image to be formed by inserting and extracting a resolution switching lens into and from a laser optical path, wherein a light emission time for said means for exposing is changeable with respect to a resolution of the print information signal, and wherein the light emission time of the means for exposing is set to a value by which vertical and lateral widths of each latent image dot on said image carrier are equal to each other.
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14. A method for exposing an image carrier for an electrophotographic apparatus, the method comprising:
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exposing the image carrier in accordance with a print information signal supplied from an external information processing apparatus; and switching between a low resolution and a high resolution of an image to be formed by inserting and extracting a resolution switching lens into and from a laser optical path, wherein a light emission time of said exposing is changeable with respect to a resolution of the print information signal, wherein the light emission time of said exposing is set to a value by which vertical and lateral widths of each latent image dot on the image carrier are equal to each other.
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Specification