JPS62147471A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To adjust the image formation state of exposure light finely by providing an LED array and a short-focus lens array movably in a direction crossing the plane which contains the optical axes of the LED array and short-focus lens array. CONSTITUTION:The short-focus lens array 11 is installed almost at the focal length characteristic to the lenses of the short-focus lens array 1 from the surface of a photosensitive drum 2. When the image formation state on the surface of the photosensitive drum 2 is not best, the LED array 10 and short-focus lens array 11 are moved at right angles to the plane which contains the optical axes of the LED array 10 and short-focus lens array 11 by adjusting the depth of a screw 36. At the time, variation B in the distance between the lens surface of the short-focus lens 11 and the surface of the photosensitive drum 2 is much smaller than the movement distance distance of the LED array 10 and short- focus lens array 11, so the LED array 10 and short-focus lens array 11 are moved greatly to vary the the distance between the lens surface and the surface of the photosensitive drum 2 only a little. Consequently, the image formation state is adjusted finely with ease.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Field of Application of Long Liang The present invention is a monolithic light emitting diode array (hereinafter referred to as L
The present invention relates to an electrostatic recording device equipped with an ID array (referred to as an ID array) and a short focus lens array as an exposure means.

(1) Conventional technology Exposure means for photoreceptors in electrostatic recording devices include electronic copying (slit exposure using an exposure lamp such as a commonly used halogen lamp) and exposure using an LED array (used in a printer device i'r). There are various methods such as.

It is important for a recording device to provide a clear image, and for this purpose, it is necessary to adjust the exposure light so that it accurately forms an image on the surface of the photoreceptor.

In an electrostatic recording apparatus equipped with a T, 1ET) array and a short focus lens array as exposure means, when adjusting the imaging state of exposure light on the 1° ram surface of a photoreceptor, Japanese Patent Application Laid-Open No. 55-931
As described in 764+ publication and Japanese Patent Application Laid-open No. FB357-14058, a short focus lens array or a short focus lens array and Ll! ! The imaging state is adjusted by moving the D array in the direction of its optical axis.

C) Problems to be Solved by the Invention In the prior art, when fine adjustment of the imaging state of exposure light on the surface of the photoreceptor drum is performed, a short focus lens array or a short focus lens array is used. ,! ! :The D array is moved in the direction of the optical axis, but the distance it is moved directly affects the state of formation of the Ninko light on the surface of the photoreceptor drum, so it is very difficult to fine-tune the image formation state. It was hot.

The present invention solves this drawback and provides an electrostatic recording device that can easily finely adjust the image formation shape of 4 m on the surface of a photoreceptor column of exposure light.

□ 2) Means for solving the problem The present invention is T, +11! In an electrostatic recording device including a D array and a short focus lens array as an exposure means, LKDID
The array focal length lens row is integrally constructed, and the L]11iD array and the short focal length lens row are arranged so as to be able to move in the direction Ks intersecting the plane formed by the optical axes of the CD play and the short focal length lens row. It is an electronic recording device.・
.

e) Function Since the LID array and the short focus lens array can move in the direction intersecting the plane formed by the optical axis of the LKDID array focal lens array, the exposure light emitted from the Lll:D array can be moved. When performing fine adjustment of the image formation state on the photoreceptor surface, the LED array and the short focal length lens array are moved in the direction that intersects the plane constituted by the optical axis. The distance between the focal lens row and the lens surface is
Small distance compared to the moving distance of the array and short focus lens row□
The imaging state of the exposure light is finely adjusted by changing the exposure light.

f) Embodiment 11 The threshold is a schematic cross-sectional view of an electrostatic printer which is one embodiment of the present invention.

+it is the printer body, (21 is the printer body 11)
A photoreceptor drum is supported by a support shaft (3) approximately in the center of the photoreceptor drum. Around this photoreceptor drum (2), there are 1.
An exposure optical system (4) that forms an electrostatic latent image on a photosensitive surface, a developing device (6) that develops the electrostatic latent image with toner, a transfer roller/C7 that transfers the toner image onto a recording paper (6), A cleaning device (8) for cleaning residual toner on the photosensitive drum [1] is sequentially arranged clockwise in the figure. The developing device (61) is rotatably equipped with a magnet roller (9) connected to a motor via an electromagnetic clutch.The exposure optical system (4) is a monolithic light emitting diode array (hereinafter referred to as I, 1nI) playback. )
fldl and this I, II! The short focus lens array Q9 forms a written image formed by the D array on a photosensitive surface, and the photosensitive surface is charged on the upstream side between the short focus lens arrays. A charging corotron (Iz) is fixedly installed.

Also, cleaning equipment RF! t+81 is equipped with a corotron for static elimination that removes residual potential on the photosensitive surface and a blade (14) that scrapes off residual toner.
11, the toner is transferred to the toner storage box. The blade 04 is configured to move toward and away from the photosensitive drum (2) using an electromagnetic plunger. On the downstream side of the transfer corotron (7), a separating corotron (lη
are placed adjacent to each other.

Ol is a paper feed cassette in which a plurality of recording papers (6) are stacked and stored, and a paper feed cassette (6) is placed at the top of the cassette for intermittently feeding the uppermost recording paper (6) in the paper supply cassette (H). A paper feed roller connected to a motor via an electromagnetic clutch is pressed into contact with the paper feed roller.

6!11 (21 is a register roller installed at the upper part of the downstream side of the paper feed cassette (lIO), which temporarily stops the recording paper (6) fed by the paper feed roller IIIK, and moves it to the transfer position at the appropriate timing. This will be re-sent.
A paper feed guide (2 ejecting 1) is provided on the register roller overhang and the four paper feed rollers. +2′! J is provided downstream of the separation corotron 61.

After the transfer, the recording paper (6) is transferred to the fixing section by a vacuum conveyor. The components from the paper feed cassette 04 to the vacuum conveyor (22 mm) are integrated and are provided so that they can be pulled out to the right from the printer body (1).

(The main part is the fixing device, which includes a heating roller P2 with a built-in heater (24), a pressing roller that presses the recording paper (6) on which the toner has been transferred to this heating roller, and the toner Paper ejection roller (capital) that ejects 1 and 9 recording sheets (61 sheets)
It is composed of On the front side, this fixing device (shio) is also integrated and is provided so that it can be pulled out to the left in the image.

It should be noted that a safety switch is provided on the front cover (not shown), and is configured to prevent the printing operation from occurring unless the cover is closed.

m2+9Kfi The upper surface m of the optical system (4) is
1+ indicates the sectional view taken along the line ■-■ in FIG. The LED ID array (O) and short focus lens row (L) are integrated, and the holder (
It is placed on page 2. Spring 1 e is attached to the holder □□□.
l! 91, and a suppression pin which is inserted through the spring 1 and a hole provided in a part of the long side of the holder (C) and has one end formed large so that the spring 1 can be removed. (Insert the screw 1 that corresponds to the pressure pin on the long side opposite to the
Two sets of 1311 are provided. Further, the holder plate is held by the frame (2) by inserting guide rods (2) provided on the frame (2) into holes provided at both ends thereof.

The holder t2 is inserted into the frame ■ by a spring 2C14 that passes through the guide rod ■, and a screw 2I that presses the holder (281) from the opposite side through the pressing member 1351 where this spring 2 is installed. The position of the LED play (l@) and short focus lens array (+11) is allowed to move in the direction perpendicular to the plane formed by these optical axes. When the center of the photoreceptor drum (2) is on the optical axis of the system (4), the distance between the lens surface of the short focus lens row (Ill) and the surface of the photoreceptor drum (2) is is installed in the printer main body f1) so that the focal length is equal to or shorter than the focal length specific to the lens.

Next, referring to FIG. 4, we will explain how the exposure light from the LED array (10) that has passed through the short focus lens array (11) is formed on the surface of the photoreceptor drum (2) (9 states). Explanation: The short focus lens row (11) is connected to the photoreceptor drum (
2) It is installed at a distance from the surface by approximately the focal length specific to the lenses of the short focus lens array (++) (as described above, the distance is not longer than the focal length). When the center of the photoreceptor drum (21) is on the optical axis of the exposure light, the image formation condition on the surface of the photoreceptor drum (2) is best (the focus of the lens for short focal length lenses is on the photoreceptor drum (2)). When the LKD array (101) and one row of short focal length lenses (11) are used as the front surface), there is no need to move the LKD array (101) and one row of short focal length lenses (11).
Adjust the depth of the 2nd screw with the KD array and the short focus lens row (++) to create the IJFXD array! 1O) and the optical axis of the short focus lens array (11) in a direction perpendicular to the plane, so that the image formation state on the surface of the photoreceptor drum (2) becomes a return image. At this time, compared to the moving distance of the LED ID array ω and the short focus lens row (11) @(A), the change in distance between the lens surface of the short focus lens (11) and the surface of the photoreceptor drum 12) (B) is very small. That is, I
The distance between the lens surface and the surface of the photoreceptor drum (2) can be slightly changed by moving the KD array (1 (to)) and the short focus lens row (11), making it possible to fine-tune the state of the image. The amount of change required during fine adjustment is approximately 11 at most, and although it depends on the diameter of the photoreceptor drum, normally the travel distance (A) required to obtain the amount of change (g) ), the curved surface of the photoreceptor drum will not cause any negative effects on the image.

Although not shown, the LED ID array focusing lens row is provided with a guide rod diagonally to the frame, and the LED
It may be moved in an oblique direction that intersects the plane consisting of the optical axis of the array focusing lens row, and in this case, before fine adjustment, it is within the focal length specific to the lens of the short focal length lens row. To! The surface of the photoreceptor may not be located, and the surface of the photoreceptor may be flat.

In this example, rotation in the plane perpendicular to the optical axis of the LED ID array o) and the short focus lens array (the two screws 1131) is made possible by adjusting the depth. Therefore, even if the central axis of the photosensitive drum (2) and the axis of the short focus lens row 0I) (and the row of the LID array (!ω)) are twisted, correction can be easily made.

g) Effects of the Invention The present invention is as described above. These 11 D arrays and short focus lens rows! ! By moving it in a direction intersecting the plane formed by the optical axes of the D array and the short focus lens array, it is possible to finely adjust the imaging state of the exposure light on the surface of the photoreceptor. At this time, the LFXD array and the short focus lens array are moved significantly to cause a slight change in the distance from the lens surface of the short focus lens array to the surface of the photoreceptor, so that fine adjustment of the imaging state can be easily performed.

[Brief explanation of drawings]

Figure 11 is a schematic cross-sectional view of one embodiment of the present invention, Figure 2 is a top view of the main part of the present invention, and Figure 3 is a cross-sectional view taken along the line ■-■ of Figure 2 of the brush @4.
The figure is an explanatory diagram of the operation. +11...Printer body, (2)...Photoconductor drum, (! (support)...L1nD array, (■)...Short focus lens row, Name...Holder, ■...Frame , (to)...Guide rod, ■...Spring 2, Country...Screw 2

Claims (1)

[Claims] 1) In an electrostatic recording device equipped with an LED array and a short focus lens array as exposure means, the LED array and the short focus lens array are integrally configured, and the LED array and the short focus lens array are connected to the LED array and the short focus lens array. An electrostatic recording device characterized in that it is provided so as to be movable in a direction intersecting a plane constituted by an optical axis.