JPS59227473A - Optical writing apparatus using plasma display - Google Patents

Abstract

PURPOSE:To make it possible to enhance dot density in writing by extending the length of display, by writing the display contents of plural lines of plasma displays on a photosensitive body in one line through an optical system. CONSTITUTION:The titled apparatus is formed of a plasma display line 11 constituted by continuously arranging a large number of plasma display elements P11-P1j, a plasma display line 12 which is arranged in parallel to the plasma display line 11 and consists of a large number of plasma display elements P21- P2j continuously arranged so as to be traversely shifted at every 1/2 of a element width and lens lines 13, 14 of which lenses are allotted at every one lens to one element in a light path reaching a photosensitive drum 9 corresponding to each of the elements P11-P1j, P22-P2j. In display to the plasma display lines 11, 12, the elements of the P2-line and the P1-line are continuously and alternately selected at every cycle Pp in the order of the element P21 P11 P22 P12 P23....

Description

[Detailed Description of the Invention] [Technical Field] The present invention makes it possible to increase the dot density at the time of writing the display contents of a plasma display onto a photoreceptor without increasing the length of the display. The present invention relates to a writing optical device using a plasma display.

[Prior art]

A conventional writing optical device using a plasma display is shown in Fig. 1. A plasma display 5 in which Y electrodes 2 are formed in glass cells 3 and 4 filled with neon and nitrogen, and an X address circuit 6 that selectively supplies voltage to the X electrodes 1 according to display signals. and X address circuit 6
and a holding voltage circuit 7 that applies a predetermined voltage to the Y electrode 2; a projection optical system 8 that projects the content displayed on the plasma display 5 onto a predetermined position at a predetermined reduction ratio; and a projection optical system 8 that writes information using the projection optical system. Zero l graphics (, XEl 几0
(GRAPHY) consists of a photosensitive drum 9 using a photosensitive material.

In the above configuration, a constant voltage is supplied to the Y electrode 2, and
When a voltage is supplied to the electrode 1 according to the display content, a glow is generated between the X electrode 1 and the Y electrode 2 to which voltage is applied at the same time, and light is emitted as a dot. In this way, by driving the X electrode 1 in accordance with the display signal, a display for υ-rows is performed. Therefore, this display content is reduced to, for example, about 1/3 of the length of the υ plasma display 5 and projected onto the photosensitive drum 9 by a projection optical system 8 including a lens. The reason why such an operation is necessary is because the dot density of the plasma display 5 is currently (several dots/mm), so it is not suitable for printers, facsimile machines, etc. that require a dot density of about (12 dots) 7 mm). First, to correct this, a reduction projection is performed.

The projected contents are written line by line on the surface of the rotating photosensitive drum 90, and a printing operation can be performed based on this writing.

However, in a conventional writing optical device using a plasma display, reduction projection is essential, so when the length of the photosensitive drum 9 is set, the reciprocal of the reduction ratio (3 times in Fig. 1) The plasma display must be long,
This has the disadvantage of requiring a large space and increasing the size of the device.

[Object and structure of the invention]

The present invention has been made in view of the above, and has the following features: When writing the display contents of a plasma display onto a photoreceptor, the dot density at the time of writing can be adjusted to a length without changing the length of the display. The present invention provides a writing optical device using a plasma display in which the display contents of a plurality of rows of plasma displays are written on a photoreceptor in one row via an optical system.

[Example J] Hereinafter, a writing optical device using a plasma display according to the present invention will be described in detail.

FIG. 2 shows an embodiment of the present invention, in which parts that are the same as those shown in FIG.
~P1j+A first plasma display row 11 that is continuously arranged, and a plurality of plasma display devices P2t~P2j that are arranged parallel to the plasma display row 11 and successively arranged horizontally by 1/2 of the element width.
a second plasma display array 12 consisting of a first plasma display array 12;
and element P1 of the second plasma display column! ~Pl
j * The photosensitive drum 9 corresponds to each of P21 to P2j.
The lens arrays 13 and 14 are configured such that one lens is assigned to one element in the optical path leading to the optical path.

The arrangement of the plasma display rows and lens rows will be explained in more detail with reference to FIG. Plasma display row 1
．． 1 (pt) and 12 (P2) share different continuous image signals every period P. For example, element p
Continuous image information exists within n, but element P
It is not necessarily directly related to ig. However, in P12, continuous image information exists. Pl and P2
The plasma display rows of P1 are parallel to each other, but P1
1 to Plj and 1'21 to P2j are arranged in a staggered manner with a shift of a half period of (Pp/2), where Pp is the length of the element. Similarly, lens rows 13 (Ll) and 14 (L
2) is also arranged in a staggered manner, and the arrangement period P between the lenses is
L is set equal to the period Pp of the plasma display. Note that I in the figure indicates a projection surface formed on the photosensitive drum 9, and the images of the plasma display array are projected onto the same straight line by each of the lens arrays 13 and 14 at a pitch pz, and are continuously Image information is given to the projection surface. Pitch Pi of the plasma display projected as image information
varies depending on the magnification of the lens, and the number of lens rows is determined by this magnification. In other words, the reduction rate is 1/
3, there will be 3 rows of reeds, and if the reduction rate is 17 m, there will be m rows.

In the above configuration, the plasma display row 11.1
The display for 2 is element Pl! 1 dpss-”P2
2 + pu + pz3 - . . . The elements in the 22nd column and the P1 column are successively and alternately selected every Pp period in the order of 2 + pu + pz3 - . . . .

The images on the projection plane caused by this drive are continuous in a straight line by the lens groups arranged in a staggered manner, and even though the plasma displays are arranged in multiple rows, the projection state is
This is the same as the case using one plasma display gray shown in the figure.

The inventors used the configuration shown in FIG. 2 for Pie P2, which is a 3 dOt/mm plasma display, and installed lenses (
The focal length is f6.
6 mm and PL': M 3.3 nrm, and the distance from the KPl and P2 planes to the projection plane was 32 mm.
(approximately 10 mm from Ll, L to the projection plane), it was possible to obtain continuous images with an overlapping portion of 0.05 rlnn or less.

Incidentally, the i-light is applied to the optical path by a molding part or the like. In that case, an aperture mask (diaphragm, approximately 2.0φ) is provided on the entry surface of each lens to remove flare and limit brightness.

In the above explanation, elements P11 to PH3 and Pit ""
Although lI%j are individually independent elements, they may also be continuous plasma display panels, which is actually more desirable. To configure this,
This is achieved by providing the electrode structures of each element independently of each other.

〔Effect of the invention〕

As explained above, according to the writing optical device using a plasma display of the present invention, the display contents of multiple rows of plasma displays are written in one row on the photoreceptor via the optical system, so that the length of the display is The dot density during writing can be increased without increasing the dot density.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a writing optical system using a conventional plasma display, FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 3 is a projection explanatory diagram of the present invention. Explanation of symbols

Claims (1)

[Claims] A plurality of plasma display rows that input a display signal and display display contents divided into a plurality of parts, and a plurality of goods
1. An optical device for enclosing a plasma display, comprising an optical system for writing divided display contents of seven display rows on a photoreceptor in one row based on the display order.