Image forming apparatus

Details Image forming apparatus Image forming apparatus

1997-02-10

1998-12-15

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347134, G03G 1304, B41J 2447

Patent

active

058502475

ABSTRACT:
An image forming apparatus having an exposure optical system provided with an exposure light source in which light-emitting elements are arranged on a base plate to be line-shaped and with a lens array of a distributed refractive index type that converges a beam emitted from the exposure light source on the surface of a photoreceptor and conducts imagewise exposure. The apparatus is configured to satisfy the expression: ##EQU1## In the expression, .DELTA.T1 represents a variation width (K) of the temperature in the vicinity of light-emitting elements, R represents a radius of the photoreceptor mentioned above, Ri represents a length (.mu.m) of each member constituting the exposure optical system in the radial direction of the photoreceptor, .alpha. represents a coefficient of linear thermal expansion (.degree.C..sup.-1) of a transparent base that forms the photoreceptor, .alpha.i represents a coefficient of linear thermal expansion (.degree.C..sup.-1) of each member that constitute the exposure optical system, and F represents the depth of focus (.mu.m) of the lens array.

REFERENCES:
patent: 4839672 (1989-06-01), Reinten
patent: 5262798 (1993-11-01), Reinten
patent: 5371525 (1994-12-01), Murano

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