JPS5843470A - Image recording apparatus - Google Patents

Abstract

PURPOSE:To prevent stains of an optical exposure system and to enhance imaging performance, by providing solid light-emitting elements and an image-forming optical system, and a developing device facing each other across a photoreceptor. CONSTITUTION:An object 8 is projected and imaged on a point 8' by reflecting a light cast from the object 8 with the first reflective face 9 of a reflecting member 10 having 2 reflective faces 9, 9', passing it through a lens 11, reflecting it with 2 reflective mirrors 13, 13 of a dach mirror 12, that is, a roof-type reflective member to change the light path, reflecting it with the second reflective face 9'. An image recording apparatus using this optical system, e.g. has such a structure that an emitted light pattern of solid light emitting diodes is projected on a drum-like photoreceptor 3 by 2 optical systems arranged in the inside of the photoreceptor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording apparatus, and more particularly to an image recording apparatus in an electrophotographic copying apparatus that forms an image of a luminescent spot of a solid-state light emitting element on a photoreceptor using an imaging optical system.

Conventionally, as shown in Fig. 1, image recording devices using solid-state light emitting elements, such as LED array printers, require a focusing light transmitter (hereinafter referred to as 8LA) and an imaging optical system such as a lens. The photoreceptor 3 can be used to project images onto the surface of the photoreceptor 3, and a trap is formed to obtain a visible image through an electrophotographic process, or as shown in FIG. The photoreceptors 3 are arranged in a row in a staggered manner.
Same as above - There is a similar method that focuses the image on the spot, but □
In both cases, the photoconductor J was exposed to light from its outer surface.

However, in the above configuration, the solid-state light-emitting element 11 converging optical system and the developing device including the developer, transfer charger j1, static elimination cleaning section t, charger 7, etc. are located outside the photoreceptor 3. Because they are placed on the same side with respect to the photoreceptor 3, the developer and dust inside the device form a layer on the surfaces of the imaging optical system and the solid-state light emitting element, contaminating them and impairing image performance. was causing deterioration.

In view of this, the present invention has been made with the object of providing an image recording apparatus that prevents staining of the exposure optical system for the photoreceptor and improves image performance.

In order to achieve the above object, the present invention provides an electrophotographic copying apparatus that images a luminescent spot of a solid-state light-emitting element on a photoreceptor using an imaging optical system, which includes a solid-state light-emitting element, an imaging optical system, and a developing device. and are disposed on opposite sides with the photoreceptor in between.

Embodiment 1 of the present invention shown in FIGS. 4 to 1S will be described below.
, Ai @ s□F""'m AA, engineering.

- Explanation with reference numerals.

Figures 1 to 2 show an example of the imaging optical system used in the present invention.
One reflective surface to project and form an image on a point? , the first reflection of the reflective member io having da+ffi? The light from the next object r is reflected by the lens // and passes through the bowl-shaped reflective member /J (
Reflection mirror (hereinafter referred to as roof mirror) /J, /J
The optical system (
Hereinafter, this will be collectively referred to as DML. In addition, when actually using it, place a VC light shielding member between the lens/l and the roof mirror/co, and
K so that the reflected light of No. 2 does not affect the adjacent optical path.

7 to 7 show a specific embodiment of a companion image recording device using the DMLA. In FIG. The light emitting pattern of elements t and i is exposed to light. , the light emitting pattern of i on the photoreceptor JKI
This is the case for KLI to emit Ig light.

Furthermore, the second diagram shows that in addition to the SLA, - imaging lenses/
SS/3 is installed, and this imaging lens /j%15 images the light-emitting pattern of the solid-state light-emitting elements /, / at the same magnification or reduced size to image the photoreceptor JKM! This is the case when it is made to glow.

The photoreceptor 3 used in the above embodiment is the 12th example.
As shown in the enlarged cross section in the figure, a transparent base material 16 made of glass, plastic, polymer film, etc.
nO3, 5n02% A mixture of these, etc., is subjected to PVD such as vacuum evaporation, sputtering method, ion blating method, etc.
A transparent conductive layer 17 is formed by a method or the like, and a photosensitive layer ttr of an inorganic photoreceptor such as S, ZnO% Cd8, or an organic photoreceptor is formed on the surface of the transparent conductive layer 17.

If the l chips of the solid-state light emitting elements l can cover the width of the photoreceptor J in the longitudinal direction, an l line arrangement may be sufficient, but if it is not possible to cover the inside, they may be arranged in a staggered manner as shown in Figure Mn2. Then, make sure that the light emitting part is on the λ line. An LED array, LD array, etc. can be used as the upper ml solid-state light emitting device.

FIG. 73 shows another embodiment, in which an optical switch array 19 and a light source J are used in place of the solid-state light emitting device 1, and the light from the light source J is transmitted to the light transmitting part by the optical switch array 19. By sequentially selecting light shielding and scarlet light, the solid state light emitting device can be used in the same way as when the light emitting portion is arbitrarily selected by an input electric signal.

The optical switch array 19 may be constructed by using dielectric ceramics such as PLZT, which has an electro-optic effect, sandwiched between polarizing plates, or by using BIG crystals to form a light transmitting part in a pattern of any size. It can be used as

The photoreceptor 3 in each of the above embodiments is of a drum type.
- A belt-like photoreceptor 3 as shown in the example can be used, and furthermore, in the case of this belt-like photoreceptor J, it is not necessarily endless, and even a sheet-like one can be applied.

Further, the input signal for selecting the light emitting element of the solid state light emitting element l may be a signal of an original image scanned by a solid state scanning element such as COD%PDA, or a signal prepared in advance and outputting an fcIlkI image. It may be. Further, as the element arrangement pattern of the solid-state light emitting device 1, an element arrangement pattern of □, t to l aotm/mu is often used, but any size can be used depending on the type and purpose of the image to be output.

Note that, as shown in FIG. 741', it is preferable to perform the exposure perpendicularly to the tangent of the exposure location on the inner circumference of the photoreceptor l so that the shape of the luminescent spot does not change. For example, as shown in FIG. 7 and in the next embodiment, it is difficult to expose λ light beams to the same point and perpendicularly to the light emitter 3. The arrangement is such that the light beams are connected from the center of rotation to the photoreceptor l, but in this case, the exposure position of one light beam is shifted. In such a case, it is sufficient to store the electric polarization of the solid light emitting atom/i in a memory and cause one line to emit light with a delay in relation to the other line by the amount of deviation between the two lines.

As explained above, one aspect of the present invention is an electrophotographic copying apparatus that forms an image of a luminescent spot of a solid-state light-emitting element on a photoreceptor using an imaging optical system. Since the configuration allows them to be placed on opposite sides of each other with their bodies in between, the exposure optical system can be placed on 8! It can be installed completely isolated from the image area, which prevents the exposure optical system from being contaminated by dust, toner solvent, etc. generated in the developing area, and prevents image quality from deteriorating over a long period of time. There are some effects that can be done.

[Brief explanation of drawings]

1 and 1 show a conventional image recording device, 1: An explanatory diagram, and FIG. 3 shows the solid-state light emitting device shown in FIG. 1, Len 1':
ζ:□ An explanatory diagram showing the positional relationship of the photoreceptor, and FIGS. 1 to 1 show an embodiment of the imaging optical string in the present invention,
The ts-diagram is a side view, the tlcz diagram is a perspective view, the ts-diagram is a plan view, FIGS. Plan view shown, M/
Figure 1 is a side view of the same, Figure 1 is an enlarged sectional view of a part of the photoreceptor, and Figures 73 to 73 are explanatory diagrams showing other embodiments of the present invention. I...Solid light emitting device, λ...Imaging optical system, 3...
Photosensitive body, da... developing device! ... Transfer charger, t... Static neutralization cleaning section, 7... Charger, 10... Reflective member, //... Lens, l...
- Roof mirror, 13...Reflecting mirror, Seri...Light shielding member, /3...Imaging lens. Applicant's agent Kiyoshi Moromata 393

Claims (1)

[Scope of Claims] 1. In an electrophotographic system that images the luminescence of a solid-state light-emitting element on a photoreceptor using a condenser optical system, the solid-state light-emitting element, the condenser optical system, and the developing device are combined. An image recording device characterized in that: are arranged on opposite sides of a photoreceptor. (c) The image recording device according to claim 1, characterized in that a converging light transmitting body (I) is used in the front ml imaging optical system. . 3. The image according to item 1', characterized in that a plurality of imaging lenses are used in the imaging optical system, and the image of the light-emitting bright spot is reduced to facilitate image formation. m recording device. 1. The imaging optical system uses a similar number of refractive lens elements arranged in a plane and a plurality of Dano mirrors, as described in claim 1, which is similar to τ. My recording device.