Laser scanning unit

Details Laser scanning unit Laser scanning unit

1999-10-21

2001-01-30

Schuberg, Darren (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S017000, C359S209100, C347S243000

Reexamination Certificate

active

06181447

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laser scanning unit (LSU) adopting a deflection disk, and more particularly, to a LSU adopting a deflection disk having a structure capable of radiating heat generated by a light source.
2. Description of the Related Art
In general, a LSU is a device which scans laser beams onto a photoreceptor so as to form a latent electrostatic image used for development. The LSU is widely used in an image output device which outputs an image by electrophotography and is divided into a rotary polygon mirror type and a deflection disk type according to the type of deflector adopted in the LSU.
Referring to
FIG. 1
, a conventional deflection disk type LSU includes a driving source
10
for providing a rotational force, a deflection disk
15
installed on a rotary shaft
11
of the driving source
10
and light sources
20
which are installed facing one surface of the deflection disk
15
at a predetermined angle and irradiate laser beams.
The deflection disk
15
consists of a plurality of sectors
15
a
each having a hologram pattern. The deflection disk generates as many scan lines as the number of sectors by being rotated once by the driving source
10
.
The light irradiated by the light sources
20
is transmitted to the deflection disk
15
and is simultaneously deflected thereby to form scan lines. A semiconductor laser emitting laser beams of a predetermined wavelength is used for the light sources
20
. Specifically, the laser irradiates light of various wavelengths depending on the change in the environment such as an increase in temperature. Accordingly, the directions of diffraction and deflection of the light change after passing through the deflection disk
15
, so that the scan lines head in undesirable directions.
SUMMARY OF THE INVENTION
To solve the above problem, it is an object of the present invention to provide a laser scanning unit (LSU) adopting a deflection disk having a structure which is capable of emitting heat generated by a light source.
To achieve the above object, there is provided a laser scanning unit (LSU) comprising at least one light source, a driving source for providing rotational force, and a deflection disk installed around a rotary shaft of the driving source, for diffracting and deflecting light incident from the light sources, wherein the deflection disk has at least one radiating portion which is depressed in and/or protrudes from the surface of the deflection disk facing the light source and induces air flow by contact with air, such that the heat generated by the light sources is radiated by the air flow induced due to the radiating portion.


REFERENCES:
patent: 60-68313 (1985-04-01), None

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