JPS6117172A - Electrostatic recorder - Google Patents

Abstract

PURPOSE:To simplify a device to reduce the cost by lighting a lamp with the quantity of light different from that for destaticization and using the light source for the fatigue of a photosensitive body also. CONSTITUTION:A destaticizing lamp 21 is lit when a photosensitive drum 9 is preparatorily rotated before the copying cycle, and further, the lamp is lit in the copying cycle for the purpose of removing the electric charge in a non-image part on the photosensitive drum. For example, when a tungsten lamp array of rated 16V is used, the voltage is switched to cope with both cases so that the lamp array is used with rated 16V voltage for fatigue exposure at the preparatory rotation time and is used with 10-12V voltage as a destaticizer in the copying cycle. Thus, the cost is reduced and the device is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the use of a static eliminator in the process of fatigue exposure applied to a photoreceptor of an electrostatic recording device.

(Jumei Technique @) PPC electrophotography generally involves charging, exposure, development, transfer,
Copying is performed by going through the fixing and cleaning processes, but if a highly sensitive photoconductive photoreceptor is used in this process, initial fatigue during the copy cycle is large, resulting in poor image quality. Differences in concentration may occur.

In such cases, a process is known in which the photoreceptor is intentionally irradiated with light during preliminary rotation to fatigue the photoreceptor, thereby eliminating the appearance of initial fatigue on the upper surface. Because of the so-called fatigue process in which the drum's potential is applied in advance, an auxiliary lamp is installed separately from the drum static eliminator and exposure device, and is turned on only during preliminary rotation and turned off during the copy cycle. However, it is not preferable to install independent light sources to achieve the respective functions of static elimination and fatigue of the photoreceptor drum because it occupies installation space, increases complexity, and increases manufacturing costs.

(Objective of the Invention) The present invention aims to simplify the apparatus and reduce costs by using the light source for static elimination also for the fatigue process of the photoreceptor.

(Accomplishment of the Invention) This purpose is to turn on a light source for charge removal in an electrostatic recording device that erases the charge on a photoreceptor with a single light during preliminary rotation before entering a copy cycle, with a light intensity different from that during charge removal. This has been achieved by providing an electrostatic recording device 1 characterized in that the light source 1111 is also used for fatigue of the photoreceptor.
k, will be done.

(Example) FIG. 1 is a schematic diagram of a -χ embodiment of the present invention.

V, Makidai] The above document is exposed by exposure lamp 2, first mirror 3,
tP12 mirror 1, fjs3 mirror 5, main lens 6,
Through the scanning of the optical system consisting of the Aguptalen χ7 and F54 mirror 8 to F7, the cleaning section 22 cleans the area, the charge is first removed and erased by the charge eliminator 21'', and then the charging device 20 positively charges the non-image area of the charge remover 21. The image is formed on the photosensitive drum 〇-1, which has been erased again by the developing device 11, and the toner in the negatively charged developer is transferred to the magnetic roller 〇2 to form a visible image. This visible image is transferred in the transfer section 23 onto the copy paper fed from the paper feed roller 14. The sheet is thermally fixed, the copying is completed, and the sheet is collected by the sheet discharge roller 19.

The charge removal lamp 21 is first turned on during preliminary rotation of the photoreceptor drum 5 before entering the copy cycle, and is further turned on during the copy cycle to remove charges from the non-image area on the photoreceptor. For example, if a tungsten lamp array with a 16 V rating is used, the 16 V rated voltage is used during pre-rotation for fatigue exposure, and the 10-10 V rated voltage is used during the copy cycle.
In another embodiment, a slit member is installed in the lamp house 31' that houses the tungsten lamp 38 of the static eliminator 21, as shown in FIG. 31, the large RJJ slit 33 is used as a slit for fatigue exposure during preliminary rotation, and the small and medium slit 32 is used as a slit for static elimination during the copy cycle, and the lamp harrassment is set so that appropriate light 11: is emitted (4). Target 1] is achieved by rotating the positions of each slit F of the slit member 31' in the same direction in the irradiation direction shown by the arrow.

Furthermore, as another embodiment, a static eliminator 21 as shown in FIG.
Two slit holes 34 are provided in the slit member 31 of the lamp house 31', and a high concentration filter 35,
A low-density filter 36 is added to obtain an appropriate amount of light for static elimination and fatigue, and the slit member 31 is rotated so that the position of each filter is adjusted in the irradiation direction.

The following embodiment is a static eliminator 2 that removes electric charge from a non-image area.
Although this is an example in which the light source 1 is used for fatigue purposes, it is also possible to use the static eliminator 21', which removes the residual charge on the photoreceptor in the pre-charging stage, for fatigue purposes by using the same means as 21. be.

(Effects of the Invention) As explained above, the present invention takes into consideration the difference between the amount of light required to impart fatigue to an electrophotographic photoreceptor and the amount of light required for eliminating static charge, and R to reduce the amount of light that causes fatigue to the electrophotographic photoreceptor. This makes it possible to reduce costs and simplify the equipment.

[Brief explanation of the drawing]

FIG. 11 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a schematic diagram of a lamp light amount switching device using a slit, and FIG. 3 is a schematic diagram of a lamp light amount changing device using a filter.

Claims (1)

[Scope of Claims] 1) A light source for static elimination of an electrostatic recording device that erases photoreceptor charges with light is turned on during preliminary rotation before entering a copy cycle, with the light intensity of the light source being different from that during static elimination. . An electrostatic recording device, characterized in that the light source is also used for fatigue of the photoreceptor. 2) The electrostatic recording device according to claim 1, wherein the amount of light is switched by changing the input voltage of the light source. 3) The electrostatic recording device according to claim 1, wherein the slit width changes the amount of light by changing filters with different transmittances.