US4089600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge device for electrophotographic copying machine
Assignee: Canon Inc
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Filing: 1976-02-02
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Granted: 1978-05-16
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Expires: 1996-02-02
Abstract
Abstract A corona discharger includes a shield and a discharge wire extended between opposed ends of the shield and supported between its ends. The position of the wire is adjustable to control the distance between the wire and a surface of a member to be subjected to the corona discharge and a spring is arranged to maintain tension on the discharge wire regardless of the position of adjustment of the wire.
Inventors
- 👤 Yoshio Ito
- 👤 Hajime Katayama
- 👤 Hiroshi Nitanda
- 👤 Masaru Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; G03G15/22; G03G15/28; G03G15/30; G03G21/00; G03G21/16; G03G21/1604; G03G21/1623; G03G21/1628; G03G21/1661; G03G2221/00; G03G2221/16; G03G2221/1606; G03G2221/1618; G03G2221/1624; G03G2221/163; G03G2221/1636; G03G2221/1651; G03G2221/1654; G03G2221/1657; G03G2221/1672; G03G2221/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
Corona discharger having a shield casing formed with a longitudinal opening defined by opposed shield plates and a discharge wire extending between two longitudinal ends of said shield casing, said corona discharger comprising: a spring for stretching the discharge wire; means for supporting the discharge wire in a portion of said shield casing inwardly of said shield plates and between said two longitudinal ends of said shield casing; and adjusting means for adjusting the position of said supporting means within said shield casing to maintain said discharge wire spaced from a member to be subjected to the discharge of the wire and to control the distance between the discharge wire and a surface of the member to be subjected to the discharge of the wire; said spring maintaining a constant tension in said discharge wire regardless of the degree of adjustment effected by said adjusting means.
Claim 2
Dependent Claim
146 words
Corona discharger having a shield casing formed with a longitudinal opening defined by opposed shield plates and a discharge wire extending between two longitudinal ends of said shield casing, said corona discharger comprising: a spring for stretching the discharge wire; means for supporting the discharge wire in a portion of said shield casing inwardly of said shield plates and between said two longitudinal ends of said shield casing; and adjusting means for adjusting the position of said supporting means within said shield casing to maintain said discharge wire spaced from a member to be subjected to the discharge of the wire and to control the distance between the discharge wire and a surface of the member to be subjected to the discharge of the wire; said spring maintaining a constant tension in said discharge wire regardless of the degree of adjustment effected by said adjusting means.
Claim 3
Dependent Claim
51 words
Corona discharger according to claim 1, wherein said means supporting the discharge wire are formed with recesses to receive the wire and the adjusting means are screws, one end of said wire being fixed to a tension member biased by said spring in a direction to apply tension to said wire.
Claim 4
Dependent Claim
58 words
A corona discharger according to claim 1, including, means for energizing said wire and grounding means including a tension pin and a grounding plate, said tension pin being adapted to shift under the influence of said spring means, upon failure of said wire, to contact said grounding plate and electrically ground the portion of said wire remaining charged.
References Cited (Backward Citations)
US3762811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |