JPS61148962A - Recorder - Google Patents

Abstract

PURPOSE:To prevent adverse effect due to scattered toner and to miniaturize the device by assembling an exposure device such as a liquid crystal head and a light source to a transparent conductor base of a photosensitive body in a recorder of a Curson type. CONSTITUTION:The photosensitive drum 11 is formed by a transparent conductive base, a liquid head 16 having a liquid light shutter 19 is provided at the inside of the body 11 and exposure is executed from the inside of the drum 11 toward a photosensitive face 11a to form an electrostatic latent image. When the latent image reaches a development section, the image is subject to toner image by a developer 13, fixed thermally by a transfer device 14 and carried at the outside of the device. On the other hand, the toner not transferred by the transfer device 14 remains as a residual toner on the face 11a and when the toner reaches a light eliminating section 24, it is eliminated by irradiating the light from a light source 17 from the inside of the drum 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a recording device, and more particularly to a recording device that performs recording by exposing a photoreceptor to light from an optical shutter or the like.

[Prior art]

The image forming process using electrophotographic technology is the MD method (
There are various methods such as (magnedynamic method), among which a charger is placed near the photoconductive photoreceptor.

A developing device, transfer device, etc. were installed. The so-called Carlson method is the most commonly used image forming method. Figure 2 shows the configuration of a recording device that uses the Carlson method. In particular, the light for exposure is directed to a liquid crystal light shutter that opens and closes the light from the light source. The transmitted light is then used.

In this Carlson method, a charger 2 applies a uniform charge to the photosensitive surface 1a of the photosensitive drum 1, and the photosensitive surface 1a is exposed to light from a liquid crystal head 3, which will be described later, to create an electrostatic latent image on the photosensitive surface 1a. form. Further, the electrostatic latent image is visualized with toner in the developing device 4, and the toner image is transferred onto the transfer paper in the transfer device 5.

The residual charge on the photosensitive surface 1a is removed by a photostatic eliminator 6, and the residual toner is removed by a cleaner 7, thereby completing one cycle of the process.

[Problems with conventional technology]

When the above-mentioned Carlson method is used to record exposure based on the opening and closing of the liquid crystal light shutter, as can be understood from the perspective view showing the internal structure of the liquid crystal head 3 in the same figure and FIG. is a light source 8 consisting of a fluorescent lamp, etc.
and a liquid crystal optical shutter 9 having a micro shutter 9a. The liquid crystal head 3 has a large capacity because it includes a drive circuit 25 for driving the lens 10 and the liquid crystal light shutter 9 to open and close. Therefore, a large space is required in the vicinity of the photosensitive drum 1, and the structure of the apparatus itself becomes complicated and large, and inspection and maintenance in case of failure are extremely difficult.

In addition, scattered toner generated during development and cleaning in the developing device 4 and cleaner 7 is present near the photosensitive drum 1, and the micro-shutter portion 9a of the liquid crystal optical shutter 9,
Scattered toner adheres to the lens 10 and the like, adversely affecting exposure.

Further, since the optical static eliminator irradiates the photosensitive surface with light through the toner present on the photosensitive surface la, there is a drawback that the static eliminator efficiency differs depending on the presence or absence of toner.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the present invention provides a Carlson type recording device that performs exposure using an optical shank or the like, which is miniaturized and is not adversely affected by scattered toner during exposure. The purpose is to

[Key points of the invention]

In order to achieve the above objects, the present invention provides a transparent and conductive base, a photoreceptor provided with a photoconductive layer on the base, a charging means for uniformly charging the photoreceptor, and a side of the base. an exposure means that is provided in the photoreceptor and performs exposure according to a signal to be recorded on the photoreceptor;

The apparatus is characterized by comprising a developing means for developing an electrostatic latent image formed by the exposure means, a transfer means for transferring the developed image onto a transfer paper, and a cleaning means for removing residual toner.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of the vicinity of the photosensitive drum of a recording apparatus according to the present invention. In the figure, a charger 12. Developing device 13. Transfer device 14
．． A cleaner 15 is provided.

A liquid crystal head 16 is provided inside/on the photosensitive drum 11 . The photosensitive drum 11 is provided to be rotatable in the direction of the arrow by a rotation mechanism (not shown), and the photosensitive drum 11 is constructed by providing a photosensitive surface 11a on the outer periphery of a transparent conductive base. The lower part of the liquid crystal navel 16 is fixedly installed inside the photoreceptor drum ll, and has a light source 17 made of a fluorescent lamp inside.
It is covered with a light shielding plate 18 having b. Further, a liquid crystal light shutter 19 is arranged such that a micro shutter part 19a is located at a position corresponding to a gap 18a of the light shielding plate 18, and a control circuit 20a for controlling the liquid crystal light shutter 19 and the liquid crystal light shutter 19.

20b is electrically connected to the flexible members 21a and 21b. Further, the liquid crystal head 16 is covered with a housing 22, a lens 23 is provided on the housing 22, and the lens 23 is provided with a lens 23.
is provided at a position where the transmitted light from the micro-shutter section 19a forms an image on the exposure section 11b of the photoreceptor drum 11. Further, the housing 22 is provided with an opening at a position corresponding to the gap 18b of the light shielding plate 18, and the light from the light source 17 passes through the gap 18b and the opening of the housing 22 to the transfer device 14 and the cleaner 15. The photoreceptor drum 11 located in between is irradiated from the inside to form an optical static elimination section 24.

The operation of the recording apparatus configured with the liquid crystal head arranged as described above will be explained below.

First, the photosensitive surface 1 of the photosensitive drum 11 rotates in the direction of the arrow.
A uniform electric charge is applied to 1a by corona discharge from a charger 12. The photosensitive surface 11a to which a uniform charge is applied is the exposed portion 1
1b, the light of the light source 17 switches to the control circuits 20a and 20.
The light passes through the micro-shutter section 19, which is driven to open and close according to the control signal b.

Light is irradiated from inside the photoreceptor drum 11 through the lens 23 .

At this time, since the photoreceptor drum 11 is made of a transparent conductive base, the charge on the irradiated portion of the photoreceptor drum 11 is erased and the photoreceptor surface 11a is An electrostatic latent image of the image data written in the control circuits 20a and 20b is formed.

Furthermore, when the electrostatic latent image formed on the photosensitive surface 11a reaches a developing section, it is visualized by a developing device 13 with toner in the developing device 13, thereby forming a toner image. This toner image is transferred to the transfer device 14.
As a result, a toner image is transferred by corona discharge to a transfer paper that is conveyed to a transfer section by a mechanism (not shown), and the toner image is thermally fixed on the transfer paper by a fixing device (not shown), and then the transfer paper is carried out of the apparatus. On the other hand, the toner that has not been completely transferred by the transfer device 14 remains on the photosensitive surface 11a as residual toner.

Residual charges due to the electrostatic latent image also remain on the photosensitive surface 11a.

When the charge remaining on the photosensitive surface 11a reaches the optical charge eliminating section 24, the light from the light source 17 is irradiated from inside the photosensitive drum 11, thereby removing it.

At this time, since the photoreceptor drum 11 is made of a transparent conductive base, a uniform amount of light is irradiated regardless of the presence or absence of toner or the amount of toner, compared to the case where light is irradiated from the outside of the photoreceptor drum 11. It is.

Residual charges can be completely removed. Also.

The toner remaining on the photosensitive surface 11a is scraped off by the cleaner 15 and removed from the photosensitive surface 11a.
A uniform electric charge is applied to a by a charger 12 in preparation for re-exposure.

As described above, the photoreceptor drum 11 is composed of a transparent conductive base, and the liquid crystal head section 16 has the liquid crystal light shutter 19.
By providing this on the inside of the photoreceptor drum 11 (transparent conductive base side), the photoreceptor surface 11 is
It is no longer necessary to provide the liquid crystal head 16 outside the photoreceptor drum 11, which requires a large space, as in the conventional case. Further, as described above, the light from the light source 17 provided in the liquid crystal head 16 is transmitted to the transfer device 14 and the cleaner 15.
By irradiating the photosensitive surface 11a with a photostatic eliminator, it is possible to irradiate light with a uniform amount of light, and furthermore, the space in the vicinity of the photosensitive drum 11 can be used effectively.

The embodiments of the present invention are not limited to the above. It is also possible to improve the transfer efficiency of the transfer device 14 by changing the shape of the casing 22 and the like to direct the light from the light source 17 to the photosensitive drum 11 located immediately in front of the transfer device 14. Further, in this embodiment, the photoreceptor drum 11 is used, but the photoreceptor is not limited to a drum shape, and a belt-shaped photoreceptor may also be used. Furthermore, it is not limited to the liquid crystal light shutter but is driven to blink by controlling digital signals.

For example, an LED (light emitting diode) array or the like may be used.

〔Effect of the invention〕

As described in detail above, according to the present invention, by incorporating an exposure device such as a liquid crystal head section and a light source into the transparent conductive base side of the photoreceptor, it is possible to effectively utilize the space outside the photoreceptor, and the device itself can be It is compact and easy to maintain.

Also, W! Because the optical device is installed inside the photoreceptor.

The toner scattered near the outer periphery of the photoreceptor does not adhere to optical devices such as lenses and adversely affect exposure. Furthermore, when irradiating light onto a photoreceptor located before entering a cleaner using a light source of an exposure device installed inside the photoreceptor, or when irradiating light onto a photoreceptor located before entering transfer, A uniform amount of light can be irradiated, and cleaning efficiency or transfer efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a recording apparatus of the present invention, FIG. 2 is a schematic configuration diagram of a conventional recording apparatus, and FIG. 3 is a perspective view showing a part of the conventional recording apparatus. DESCRIPTION OF SYMBOLS 11... Photosensitive drum, 11a... Photosensitive surface, 12... Charger, 13... Developing device, 14... Transfer device. 15...Cleaner 9 16...Liquid crystal head,
17... Light source, 18... Shielding plate,
18a, 18b - gap section. 19... Liquid crystal light shutter, 19a... Micro shutter section, 20a, 20b... Control circuit, 21a, 21b... Flexible member,
22... Housing, 23... Lens,
24... Optical static elimination section. Patent Applicant Casio Computer Co., Ltd. Same as above
Casio Electronic Industries Co., Ltd. Patent Attorney Dai
Yoshi Suga 2 Figure 1

Claims (3)

[Claims] (1) A transparent and conductive base, a photoconductor having a photoconductive layer provided on the base, a charging means for uniformly charging the photoconductor, and a charging means provided on the base side for recording on the photoconductor. an exposure means that performs exposure according to a signal to be exposed, a developing means that visualizes the electrostatic latent image formed by the exposure means, a transfer means that transfers the developed image onto transfer paper, and a cleaning device that removes residual toner. A recording device comprising: means. (2) The exposure means includes a light source and an irradiation means that includes a light shutter that opens and closes according to the signal to be recorded and irradiates the photoreceptor located in front of the transfer means with light from the light source. A recording device according to claim 1. (3) The exposure means includes a light source and an irradiation means that includes a light shutter that is driven to open and close according to a signal to be recorded, and irradiates the photoreceptor located in front of the cleaning means with light from the light source. Characteristic claim 1
Recording device as described in section.