JPS5931991A - Optical destaticization device of laser beam printer - Google Patents

Abstract

PURPOSE:To obtain uniform destaticization light intensity over the entire lenthwise area of a photosensitive drum by using laser light for the destaticization light of an electrophotographic process and scanning it on the photosensitive drum through an optical scanning system by the deflector of a photoscanner for exposure. CONSTITUTION:The photosensitive drum 1 is rotated at a constant speed as shown by an arrow and its surface is electrostatically charged by a corona discharger uniformly, Then the photosensitive drum 1 is irradiated with write laser light 9 from the photoscanner to form an electrostatic latent image, a toner is stuck to this electrostatic latent image by a developing device 3, and the toner is transferred to an unshown transferring form by a transferring device 4. After this transfer, the toner remaining on the photosensitive drum 1 is removed by a cleaning device 5 and then the photosensitive drum 1 is irradiated with the laser light 11 for destaticization from a laser light source 10 to carry out destaticization.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical static eliminator for a laser beam printer that performs high-speed and high-quality printing.A laser beam printer combines an optical scanning device that scans a laser beam and an electrophotographic recording device. As is well known, in electrophotographic recording, each process of charging, exposure, development, transfer, cleaning, and static elimination is carried out on a photosensitive drum, and a laser beam printer uses an optical scanning device to carry out the exposure process. There are a zero charge removal process, an electrical charge removal method using AC corona, and an optical charge removal method, which removes the charge on the photosensitive drum by light irradiation.

Conventional optical static eliminators for laser beat printers use a tungsten lamp or a fluorescent light as a light source, and irradiate the photosensitive drum directly with a circle or through a optical filter. Since the photosensitive drum needs to be installed somewhat close to the photosensitive drum, it occupies part of the circumference of the photosensitive drum, which makes it difficult to install a compact laser beam printer. It was an obstacle to achieving this goal.

Since the optical filter and light source are installed near the drum, there is a disadvantage that toner adheres to these and the light meter decreases, and it is difficult to use a tungsten lamp or fluorescent lamp to There is also the problem that it is difficult to make the intensity of the static eliminating light uniform in the longitudinal direction of the photosensitive drum.

Historically,) 1; The minimum rated power of a source is about 1OW in the case of a fluorescent lamp, for example, but even this is too strong to remove +li light, so it is currently limited by slits, etc. However, it also had the disadvantage of extremely low light efficiency.

The present invention aims to solve these drawbacks, and is therefore characterized by using a laser beam as the static eliminating light, and by scanning this laser beam with an exposure light scanning device to irradiate the photosensitive drum. shall be.

Figure 1 is a schematic side view showing a first embodiment of the present invention, and in the figure, 1 is a conductive base material containing Se, ccis ¥! dj good machine M',,
:, j', body, etc. is a photosensitive drum coated with optical semiconductors, and along the outer periphery of this photosensitive drum 1 there are a corona belt, a container 2, a developing device 3, a transfer device 4, and a cleaning device 5. Each of them is arranged at a predetermined position, and this makes up a photogenic device. 0 6 is a writing laser light source, γ is a deflector such as a rotating polygon mirror, 8 is a scanning optical system, These constitute an optical scanning device In, which is installed so as to face the photosensitive drum 1 at a certain interval from the optical scanning device t, and output from the writing laser light source section 6. The writing laser beam 9 is scanned by a deflector 1) and is scanned onto the photosensitive drum 1 through the optical system 8. It has become so. The writing laser beam 9 is turned into a minute spot on the photosensitive drum 1 by the scanning optical system 8, and is scanned in the longitudinal direction of the photosensitive drum 1.
0iJ, the static elimination laser light source section, this static elimination 1/-the L
(The output of #'A section 10 is scanned through the entire scanning optical system 8 by the deflector γ)
, 1 becomes [44QJ, the static elimination laser beam 11 becomes 0. In other words, the GeC hair removal device of this embodiment uses the static elimination laser light source F?
A groove is formed by incorporating +S10 into an optical scanning device.

Here, to describe the operation of the configuration described above, the photosensitive drum 1 is rotated at a constant speed in the direction of the arrow, and its surface is uniformly charged by the corona charger 2. The photosensitive drum 1 is irradiated with a writing laser beam 9 from the scanning device to form an electrostatic latent image, and this electrostatic latent image V is formed (the toner is deposited with the detector 3, and this toner is is transferred to a transfer paper (not shown) by a transfer device 4. After the transfer is performed in this way, the toner υ remaining on the electric shock absorber 1 is removed by a cleaning device 51C, and then a laser light source for hair removal is removed. The photosensitive drum 1 is irradiated with the laser beam 11 for removal 7L of 10, and charge removal is performed.

FIG. 2 is an explanatory diagram of an optical scanning device including the above-mentioned optical static eliminator. It shows. The writing laser beam *, Fil~6, is located on the optical axis of the scanning optical system 8, and as shown in the figure, is composed of a condensing lens 13 and a semiconductor laser 14. Here, the oscillation of the semiconductor laser 14 is directly modulated by a video signal or the like.

On the other hand, the static elimination laser light source section 10 is also composed of a condensing lens 15 and a semiconductor laser 16.
The static elimination laser beam 11 is continuously oscillated or synchronized with the flirt IIjJ device γ.
When it is in the second position, only the sound oscillates. This static elimination laser light source section 10 has a margin of 1
After being scanned by the deflector 1, the static eliminating laser (11) is guided to a static eliminating position on the photosensitive drum 1.

Note that the static eliminating laser beam 11 can be guided to a desired position on the photosensitive drum 1 using a mirror or the like, and therefore, the static eliminating position is set to a position in front of the cleaning device 5 in FIG. It is also possible to do 0, except for one side. The precision of placement can be lowered.

FIG. 3 is an explanatory diagram of a laser light source section according to a second embodiment of the present invention. In the figure, 17 is a 1C-Ne laser;
l! It is a continuous wave laser such as e-Cd laser or Ar laser, -1: / 18 is beer l, magnifier, 19
1(, 20 is a modulator, 20 is a half mirror 121 disposed between the optical modulator 19 and the beam expander 18, and the half mirror 121 is the...
- It is a reflecting mirror installed so as to face the mirror 20).

In this configuration, the output from the continuous wave laser 11 is
Beam expander 18 and modulation? The beam 22 that has passed through the mirror 19 is scanned by the deflector 7, similar to the conventional optical scanning device using a continuous wave laser. The laser beam is made to enter the deflector I by the reflecting mirror 21.
This laser beam is used as a laser beam 23 for removal purposes.

Even if V is divided in this way, the division '15.
It can be performed.

As explained above, the present invention uses a laser beam as a static eliminating light in an electrophotographic process in a laser beam printer, and passes the laser beam through a scanning optical system by a deflector of a L scanning device for exposure. Scan over the drum ('f'
Since it is made of J construction, the following effects can be obtained.

First, since the laser beam is scanned as static-eliminating light, the intensity of the static-eliminating light is uniform over the entire longitudinal direction of the photosensitive drum.Also, the intensity of the static-eliminating light is uniform over the entire length of the photosensitive drum. Since the 114-single-an element such as the light source is incorporated into the optical scanning device for exposure, there is no need to worry about space for the removal device, and a compact laser beam printer can therefore be achieved.

In addition, since the light source is located far from the photosensitive drum, the intensity of the static eliminating light does not decrease due to toner adhesion, and the light efficiency is also improved, making it possible to obtain high quality static eliminating light at a low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram 1111 showing a first embodiment of the invention.
Fig. 2 includes the optical static eliminator according to the present invention) 1r.
, during the description of the f'F device, FIG.
FIG. 3 is an explanatory diagram of a laser light source section in an Irj example. 1... Photosensitive drum 6... -41Δ river laser redundant unit 7... 1tIit direction device 8... Scanning optical system 9...
・Writing laser 10...Static charge removal laser 11...Static charge removal laser'L 13...Condensing lens,
Zu 14...half 6 (tree laser 15...!jyun 10
Lens'16...Pa1'~Toru No.1, Laser 11...
・Continuous i1^ laser 18...Beam expander 19
...Light modulation type 20...Half mirror 21...Reflection mirror 22...II included +1J laser beam 23...
Exclusion + ti: IIJ laser! i &+f'l applicant oki +1. ．． Qi' Jl Industry A Ceremony' (I: Representative Patent Attorney Money

Claims (1)

[Scope of Claims] 1. A laser beam printer that combines an optical scanning device constituted by a laser beam source 9, a deflector and a scanning optical system, and an electrophotographic device having a photosensitive drum.・Stay,
Rayleigh light is used as static elimination light in the electrophotographic process, and the laser light is scanned by the deflector and scanning optical system of the L scanning device to scan the Y7 drum (f(j 1.i)). An optical static eliminator for a laser beam printer characterized by the following: 2.) I': A nine source part of a laser for static removal is arranged outside the optical axis of the scanning optical system of the IJZ arrangement device, and the laser light source for static removal is outputted from this laser light source. 1. A light removal device for a laser beam printer according to claim 1, wherein the main feature is to scan the charge removal laser beam using a deflector and an IL system. 3. When the laser light source section of the optical scanning device is equipped with a continuous wave laser and an optical modulator and has a ζ structure, a no-f mirror is placed between the continuous wave laser and the optical modulator to emit static electricity from the laser beam. 2. An optical static eliminator for a laser beam printer according to claim 1, wherein the optical static eliminator for a laser beam printer is scanned by a deflector and a scanning optical system.