JPH01161270A - Electrostatic recorder - Google Patents

Abstract

PURPOSE:To scale down an entire device including a photosensitive body by closely arraying the optical image output ends of optical fibers close to a surface on the side where the photoconductive layer of a photosensitive substrate is not formed and in a direction intersecting orthogonally with the moving direction of a photosensitive body and positioning the optical image input ends of the optical fibers outside the photosensitive body. CONSTITUTION:An output end holding member 23 holding the optical image output ends of the optical fibers 22 extends to the inside of a glass substrate 14 in the direction intersecting orthogonally with the moving direction of a photosensitive drum 2. A light emitting diode train 13 closely arrayed in a perpendicular direction is positioned outside the photosensitive drum 2, and the optical image input ends of the optical fibers 22 are positioned around the train 13. With respect to the optical fibers 22, their optical image output ends are closely arrayed parallel to the rotating axial line of the photosensitive drum 2, their input ends are closely arrayed in the perpendicular direction, and their central part is bound cylindrically. Thus the entire device including the photosensitive drum can be scaled down.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a type of electrostatic recording device in which a photoconductive layer is formed on the surface of a transparent substrate and a light image is projected from the back side. .

(b) Conventional technology An electrostatic recording device that projects an optical image from the back side of a photoreceptor having a transparent substrate is disclosed in, for example, Japanese Patent Publication No. 50273/1983.

In the electrostatic recording device disclosed in this publication, a light emitting diode array and a short focus lens array are mounted inside a photoreceptor (inside an area defined by the photoreceptor).

(c) Problems to be Solved by the Invention As mentioned above, in the conventional technology, a photoreceptor is provided with a photoimage forming means inside the photoreceptor, which increases the size of the photoreceptor and the overall size of the apparatus.

B) Means for Solving the Problems The present invention comprises: a photoreceptor having a photoconductive layer laminated on a transparent substrate and moving in a fixed direction; an optical fiber for projecting and forming a light image onto the photoreceptor; In this electrostatic recording device, the optical image guiding end of the optical fiber is located on the side of the transparent substrate of the photoreceptor on which the photoconductive layer is not formed. The optical fibers are close to each other and closely arranged in a direction intersecting the moving direction of the photoreceptor, and the optical image introducing end of the optical fiber is near the optical image forming means located outside the area defined by the photoreceptor. It is characterized by being located in

(e) Function In the present invention, since the photoimage forming means is located outside the photoreceptor, the photoreceptor itself can be miniaturized.

(f) Embodiment The drawings all show one embodiment of the present invention, and FIG. 1 is an internal configuration diagram, and 7I! Figure j2 is a longitudinal sectional view.

The electrostatic printer shown in these figures employs a developing and cleaning device.

1) is the main body of the printer, in which a photoreceptor drum (2) is rotatably mounted. An alternating current weight-removing corotron (3) for removing static electricity from the photoreceptor (2) is provided diagonally above the photoreceptor drum (2). Double cleaning device (4
) is provided.

Further, a DC corotron (5) (charging potential is +400■) for charging and transferring is provided at the bottom of the photoreceptor drum (2), and to the right of this DC corotron (5), a toner A pair of paper feed rollers f6) 17+ for feeding the transfer paper on which the image is to be transferred, and a registration shutter (8)
is provided.

Further, to the left of the DC corotron (5), there are provided a transfer paper conveyance roller (9) and a heat roller pair t101 il 11 for fixing the toner on the transfer paper.

(121 is an erase lamp.

Next, the photosensitive drum (2) and the light emitting diode array 1.31 as a photoimage forming means will be explained.

In the photosensitive drum (2), a transparent conductive film 051 made of ITO is formed on the surface of a cylindrical glass substrate t141, and a photoconductive layer (le) made of amorphous silicon is laminated on the surface.

A disk-shaped lid (17) is attached to one end of the glass substrate ++, 1+.
is attached, and the protrusion of this lid body 171 is attached to a bearing (1
It is rotatably attached to one chassis (1m) via &.

Further, a large annular bearing (20) is attached to the other end of the glass substrate 141, and is fixed to the other chassis 211 by this bearing 201. Note that the transparent conductive film (19) is connected to the chassis (191'a) and grounded via the bearing (18) (201).

Inside the glass substrate II, an optical fiber (a lead-out end holding member that holds the light image lead-out end of '21) is mounted in a direction parallel to the rotation curve of the photoreceptor drum (2) (the photoreceptor drum (2)).
2) extends in the direction perpendicular to the moving direction of 2).

Light emitting diode row 'i3 closely arranged in the vertical direction
1 is located outside the photoreceptor drum (2),
An introduction end holding member for holding the optical image introduction end of the optical fiber 021 is provided in the vicinity thereof.

The optical fibers (221) are closely arranged with their light image leading ends parallel to the rotational axis of the photoreceptor drum (2) and their light image introducing ends in the vertical direction, and their central parts are tied into a cylindrical shape. It's cool.

Then, when the light emitting diode row t131 selectively emits light and a light image is formed, the light image is transmitted to the optical fiber: 2.
The 21O element is introduced from the inlet end, led out from the light image lead-out end, and the photoreceptor drum (
2).

Then, a desired electrostatic latent image is formed on the front side of the photoreceptor drum (2).

It should be noted that the respective operations of development, transfer, cleaning, paper feeding, and fixing are not unique and are well known, so a description thereof will be omitted.

(g) Effects of the invention In the present invention, only the light image leading end of the optical fiber is located inside the photoreceptor, and the optical image forming means is located outside the photoreceptor, so the photoreceptor can be made smaller. This allows the entire device to be miniaturized.

Further, since optical fibers have extremely low transmission loss of light beams, the output of the optical image forming means can be suppressed as much as possible.

Furthermore, if the optical image forming means is formed of a light emitting diode, it becomes possible to mount this on a printed circuit board, and the efficiency of arranging the components is further increased.

[Brief explanation of the drawing]

The drawings all show an example of the present invention, with FIG. 1 being an internal configuration diagram and FIG. 2 being a longitudinal sectional view. (1)... Printer body, (2)... Photosensitive drum, (131... Light emitting diode row, (141...
...Glass substrate, f151...Transparent conductive film, (1υ
...Photoconductive layer, f22...Optical fiber.

Claims (1)

[Scope of Claims] 1. A photoconductor having a photoconductive layer laminated on a transparent substrate and moving in a fixed direction, an optical fiber for projecting and forming an optical image onto the photoconductor, and an optical fiber connected to the optical fiber. an electrostatic recording device comprising means for introducing an image, the light image leading end of the optical fiber approaches a surface of the transparent substrate of the photoreceptor on which the photoconductive layer is not formed; The optical fibers are closely arranged in a direction intersecting the moving direction of the photoreceptor, and the optical image introducing end of the optical fiber is located near the optical image forming means located outside the area defined by the photoreceptor. An electrostatic recording device characterized by: