US4154520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic latent image developing device
Assignee: Olympus Corp
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Filing: 1977-10-03
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Granted: 1979-05-15
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Expires: 1997-10-03
Abstract
Abstract An electrostatic latent image developing device capable of converting an electrostatic latent image to a visible image with the aid of a toner containing magnetic material is disclosed. The device comprises means for making the moving speed of the toner higher than the travelling speed of the electrostatic latent image.
Inventors
- 👤 Masaji Nishikawa
- 👤 Yoshiro Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
In an electrostatic latent image developing device comprising a rotatable cylindrical magnet surrounded by a rotatable non-magnetic sleeve and causing a magnetic toner to move along the peripheral surface of said non-magnetic sleeve, an electrostatic latent image holding member opposed to and spaced apart from said non-magnetic sleeve and holding an electrostatic latent image produced threon, said electrostatic latent image contacting said magnetic toner and being converted to a visible image, and means for making the moving speed of said toner at least 2 times higher than the travelling speed of said electrostatic latent image produced on said holding member, the improvement comprising a lip-shaped member secured at one end to a supporting member and arranged in the rear of a contact portion between said electrostatic latent image produced on said holding member and said magnetic toner as viewed in the travelling direction of said electrostatic latent image, the free end of said lip-shaped member being located at said contact portion, said lip-shaped member serving to eliminate any toner build up at said contact portion.
Claim 2
Dependent Claim
175 words
In an electrostatic latent image developing device comprising a rotatable cylindrical magnet surrounded by a rotatable non-magnetic sleeve and causing a magnetic toner to move along the peripheral surface of said non-magnetic sleeve, an electrostatic latent image holding member opposed to and spaced apart from said non-magnetic sleeve and holding an electrostatic latent image produced threon, said electrostatic latent image contacting said magnetic toner and being converted to a visible image, and means for making the moving speed of said toner at least 2 times higher than the travelling speed of said electrostatic latent image produced on said holding member, the improvement comprising a lip-shaped member secured at one end to a supporting member and arranged in the rear of a contact portion between said electrostatic latent image produced on said holding member and said magnetic toner as viewed in the travelling direction of said electrostatic latent image, the free end of said lip-shaped member being located at said contact portion, said lip-shaped member serving to eliminate any toner build up at said contact portion.
Claim 3
Dependent Claim
16 words
The device according to claim 1, wherein said lip-shaped member is formed of a rigid material.
Claim 4
Dependent Claim
16 words
The device according to claim 1, wherein said lip-shaped member is formed of a flexible material.
References Cited (Backward Citations)
US3332396A
Cited
US3900001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |