US5160969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus having a separate black developer stored for a color image
Assignee: Ricoh Co Ltd
•
Filing: 1991-05-29
•
Granted: 1992-11-03
•
Expires: 2011-05-29
Abstract
Abstract An image forming apparatus has a plurality of developing containers for developing an electrostatic latent image of a latent image carrier by toners having colors different from each other except for black; a black developing container for color for storing black toner for color and operated when the developed image on the latent image carrier every color is overlapped and transferred onto a transfer material to provide a color image; a black developing container for a monochromatic image for storing black toner for a monochromatic image and operated when the monochromatic image is obtained; and a device for arranging the respective developing containers such that the developing containers are opposite to the latent image carrier. The other image forming apparatuses are also shown.
Inventors
- 👤 Kenichi Mizuma
- 👤 Hideya Furuta
- 👤 Nobuo Kasahara
- 👤 Noriyuki Kimura
- 👤 Shinju Nagatsuna
- 👤 Mitsuru Mamizuka
- 👤 Yoshihiro Sakai
- 👤 Kazunori Bannai
- 👤 Kazushige Taguchi
- 👤 Yasunori Kawaishi
- 👤 Makoto Ohsaki
- 👤 Tatsuo Hirono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/0126
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide a color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, a melting temperature of the first black developer being set to be lower then that of the second black developer.
Claim 2
Dependent Claim
162 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide a color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, a melting temperature of the first black developer being set to be lower then that of the second black developer.
Claim 3
Dependent Claim
44 words
An image forming apparatus according to claim 1, in which an image having no glossiness and easy to read is provided in a case of the monochromatic image, a glossy image having a good appearance is provided in a case of the color image.
Claim 4
Dependent Claim
40 words
An image informing apparatus according to claim 1, in which developing processings with respect to yellow, magenta, cyan and black colors are respectively performed in a same developing position of said photosentsitive body in a case of the color image.
Claim 5
Dependent Claim
167 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from such other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of the color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, glossiness of the monochromatic image developed by the second black developer being less than that of the color image developed by the first black developer.
Claim 6
Dependent Claim
167 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from such other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of the color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, glossiness of the monochromatic image developed by the second black developer being less than that of the color image developed by the first black developer.
Claim 7
Dependent Claim
55 words
An image forming apparatus according to claim 4, in which an image having glossiness less than that of the color image and easy to read is provided in a case of the monochromatic image, a bright image having glossiness greater than that of the monochromatic image is provided in a case of the color image.
Claim 8
Dependent Claim
27 words
An image forming apparatus according to claim 4, in which characters easy to read and clear pictures are provided on a same plane of the transfer material.
Claim 9
Dependent Claim
160 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, the first black developer being composed of one component, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, the second black developer being composed of two components, said second black developing container being operated when the monochromatic image in obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body.
Claim 10
Dependent Claim
160 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, the first black developer being composed of one component, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, the second black developer being composed of two components, said second black developing container being operated when the monochromatic image in obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body.
Claim 11
Dependent Claim
28 words
An image forming apparatus according to claim 7, in which said first black developing container stores only toner and said second black developing container stores toner and carrier.
Claim 12
Dependent Claim
32 words
An image forming apparatus according to claim 7, in which said color developing containers and said first black developing container can be moved toward a same developing position of said photosensitive body.
Claim 13
Dependent Claim
168 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, the second black developer being composed of carrier of a resistance greater than that of each of carriers of said toners and said first black developer.
Claim 14
Dependent Claim
168 words
An image forming apparatus comprising: a plurality of color developing containers for developing an electrostatic latent image on a photosensitive body by toners having colors different from each other except for black; a first black developing container for storing a first black developer for a color image, said first black developing container being operated when a developed image on said photosensitive body for every color is overlapped and transferred onto a transfer material to provide the color image; a second black developing container for storing a second black developer for a monochromatic image, said second black developing container being operated when the monochromatic image is obtained; and means for arranging each of said color developing containers and said first black developing container such that each of said color developing containers and said first black developing container is opposite to said photosensitive body, the second black developer being composed of carrier of a resistance greater than that of each of carriers of said toners and said first black developer.
Claim 15
Dependent Claim
28 words
An image forming apparatus according to claim 10, in which said first black developing container and said color developing containers are formed in a shape of a drum.
References Cited (Backward Citations)
US3970042A
Cited
US4659211A
Cited
JPS60254167A
Cited
US4891672A
Cited
US4841337A
Cited
US4884096A
Cited
US4939548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |