# US 5,708,930 A · Color image forming apparatus having a transparent image forming body

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- Number: US 5,708,930 A
- Document ID: US5708930A
- Status: Granted
- Kind: A
- Application number: 08/587,220
- Filed: 1996-01-16
- Granted: 1998-01-13
- Earliest claimed: 1995-01-19
- Assignees: Konica Corporation
- Inventors: Hisayoshi Nagase; Shuta Hamada; Satoshi Haneda; Hiroyuki Tokimatsu
- Web page: https://patentgrep.com/patent/US5708930A

## CPC

- G03G 15/326: {by application of light, e.g. using a LED array}
- G03G 15/0152: {onto which the monocolour toner images are superposed before common transfer from the recording member}
- G03G 15/0163: {primary transfer to the final recording medium}
- G03G 15/04081: {Exposure from behind the photoconductive surface}
- G03G 15/0173: {plural rotations of recording member to produce multicoloured copy, e.g. rotating set of developing units (G03G15/0163 takes precedence)}
- G03G 2215/0497: Exposure from behind the image carrying surface
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus such as a copier or a printer for forming a color image. The image forming apparatus includes: a transparent photoreceptor drum for retaining a multi-color toner image in which the wall-thickness and an inner diameter of the drum are respectively between 2.5 mm and 8 mm and between 60 mm and 200 mm; plural chargers, provided on the periphery of the photoreceptor drum, for charging the drum surface; plural imagewise exposure systems, provided inside of the photoreceptor drum, for forming latent images on the drum surface; and plural developers, provided on the periphery of the photoreceptor drum, for developing the latent images with different color toners so as to form a superimposed multi-color toner image on the drum surface while the photoreceptor drum is being rotated one time.

## Claims

### Claim 1

An image forming apparatus for forming a color image, comprising:
an image forming body, being rotatable and having a drum-shaped body and a circumferential surface, for retaining a color toner image;
wherein said image forming body includes:
a transparent substrate having a wall-thickness between 2.5 mm and 8 mm and an inner diameter between 60 mm and 200 mm; and
a light-sensitive layer;
a plurality of charging means, provided on a periphery of said image forming body, for charging said image forming body;
a plurality of imagewise exposure means, provided inside of said image forming body, for forming a latent image on said circumferential surface; and
a plurality of developing means, provided on a periphery of said image forming body, for developing said latent image with a color toner so as to form a color toner image on said circumferential surface.

### Claim 2 (depends on 1)

The image forming apparatus of claim 1, wherein said color toner image is formed on said circumferential surface for a plurality of times while said image forming body is being rotated one time.

### Claim 3 (depends on 1)

The image forming apparatus of claim 1, wherein said transparent substrate is made of resins.

### Claim 4 (depends on 3)

The image forming apparatus of claim 3, wherein at least one of a flange portion and a gear portion is uniformly formed on an end of with said transparent substrate.

### Claim 5 (depends on 1)

The image forming apparatus of claim 1, wherein said image forming body is surrounded with said plurality of said developing means, and said each developing means is in pressure contact with an outer surface of said image forming body.

### Claim 6 (depends on 1)

The image forming apparatus of claim 1, further comprising:
a supporting means for commonly supporting said image forming body and said plurality of imagewise exposure means.

### Claim 7 (depends on 6)

The image forming apparatus of claim 6, wherein said plurality of imagewise exposure means are located in a periphery of said image forming body at same interval distances.

### Claim 8 (depends on 1)

The image forming apparatus of claim 1, wherein said transparent substrate is made of a resin which is polymerized in the steps of:
pouring a polymerizing liquid material in a cylindrical mold; and
rotating and heating said polymerizing liquid material in said cylindrical mold.

### Claim 9 (depends on 8)

The image forming apparatus of claim 8, wherein said polymerizing liquid is rotated and heated in a presence of a catalyzer.

### Claim 10 (depends on 8)

The image forming apparatus of claim 8, wherein said polymerizing liquid material includes at least one of a crosslinking agent, a conductivity-donating agent, and a coloring agent.

### Claim 11 (depends on 8)

The image forming apparatus of claim 8, wherein said transparent substrate is coated to form an organic photoconductive layer on said transparent substrate.

### Claim 12 (depends on 1)

The image forming apparatus of claim 1, wherein said transparent substrate is made of optical glasses.