Patent US4194575A successfully refreshed from Google Patents.
US5457521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus with isolated silicone gas
Assignee: Sharp Corp
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Filing: 1994-04-12
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Granted: 1995-10-10
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Expires: 2014-04-12
Abstract
Abstract An object of the invention is to prevent a silicone gas generated in a fixing unit from entering into a charger. A corona wind rises when the charger corona-discharges, and air is taken in through an outside-air intake. The air flows in through the air passage and the air inlet and flows out through a front opening as an air flow. The silicone gas is isolated by the airflow and prevented from entering into the charger.
Inventors
- 👤 Takashi Makiura
- 👤 Shinichi Azumi
- 👤 Hiroaki Yoshida
- 👤 Toyokazu Mori
- 👤 Yoshinobu Tateishi
- 👤 Mitsuyoshi Terada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:14
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0258; G03G15/0291; G03G21/00; G03G21/20; G03G21/206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
An image forming apparatus in a body of which a charger for electrification of a photosensitive body is provided in such arrangement that a front opening of the charger is opposed to the photosensitive body, comprising: an outside-air intake formed in the image forming apparatus body; an air inlet formed in the charger; and an air passage communicating between the air inlet and the outside-air intake; wherein a filter is installed in the outside-air intake; and wherein said air passage comprises two ducts formed as one body united with the image forming apparatus body in such a way that each of said two ducts shares a common sidewall with a respective sidewall of said image forming apparatus body.
Claim 2
Dependent Claim
118 words
An image forming apparatus in a body of which a charger for electrification of a photosensitive body is provided in such arrangement that a front opening of the charger is opposed to the photosensitive body, comprising: an outside-air intake formed in the image forming apparatus body; an air inlet formed in the charger; and an air passage communicating between the air inlet and the outside-air intake; wherein a filter is installed in the outside-air intake; and wherein said air passage comprises two ducts formed as one body united with the image forming apparatus body in such a way that each of said two ducts shares a common sidewall with a respective sidewall of said image forming apparatus body.
Claim 3
Dependent Claim
38 words
An image forming apparatus of claim 1, wherein a photosensitive cartridge provided with the photosensitive body and the charger is disconnectably installed in the image forming apparatus body and the air passage is formed in the photosensitive cartridge.
Claim 4
Dependent Claim
27 words
An image forming apparatus of claim 2, wherein the air passage is formed by utilizing a side wall of the photosensitive cartridge in a longitudinal direction thereof.
Claim 5
Dependent Claim
21 words
An image forming apparatus of claim 2, wherein the outside-air intake is formed on a top face of the photosensitive cartridge.
Claim 6
Dependent Claim
18 words
An image forming apparatus of claim 1, wherein the outside-air intake is arranged apart from a fixing unit.
Claim 7
Dependent Claim
18 words
An image forming apparatus of claim 4, wherein the outside-air intake is arranged apart from a fixing unit.
Claim 8
Dependent Claim
10 words
The apparatus of claim 1, wherein said ducts are L-shaped.
Claim 9
Dependent Claim
19 words
The apparatus of claim 1, wherein said air inlet is formed along an entire longitudinal side of said charger.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |