US4033687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube pickup device
Assignee: Canon Inc
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Filing: 1976-03-03
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Granted: 1977-07-05
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Expires: 1996-03-03
Abstract
Abstract A cathode ray tube pickup device comprises a photosensitive medium having a dielectric layer, a photoconductive layer and conductive layer, a charger for uniformly charging the surface of the photosensitive medium, a discharger for uniformly discharging the charged surface of the photosensitive medium, an optical fiber tube closely spaced from the surface of the photosensitive medium to effect negative image application thereon, and developing means for developing the surface of the photosensitive medium with a toner opposite in polarity to the charge in said surface.
Inventors
- 👤 Kazuhiro Hirayama
- 👤 Syusei Tsukada
- 👤 Takahiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/226; G03G15/32; G03G15/326; G03G15/328
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
A cathode ray tube pickup device comprising: a photosensitive medium having a dielectric layer, a photoconductive layer and a conductive layer; means for uniformly charging the surface of said photosensitive medium; means for uniformly discharging the charged surface of said photosensitive medium; an optical fiber tube disposed closely adjacent to the surface of said photosensitive medium to apply a light image to the previously charged and discharged surface thereof to form a latent image upon said surface; and means for developing the latent image on the surface of said photosensitive medium with a liquid developer including a toner having a charge polarity for developing that portion of the latent image corresponding to the light portion of the light image, wherein the developed image is a negative of the light image.
Claim 2
Dependent Claim
130 words
A cathode ray tube pickup device comprising: a photosensitive medium having a dielectric layer, a photoconductive layer and a conductive layer; means for uniformly charging the surface of said photosensitive medium; means for uniformly discharging the charged surface of said photosensitive medium; an optical fiber tube disposed closely adjacent to the surface of said photosensitive medium to apply a light image to the previously charged and discharged surface thereof to form a latent image upon said surface; and means for developing the latent image on the surface of said photosensitive medium with a liquid developer including a toner having a charge polarity for developing that portion of the latent image corresponding to the light portion of the light image, wherein the developed image is a negative of the light image.
Claim 3
Dependent Claim
38 words
A cathode ray tube pickup device as set forth in claim 1, further comprising means for removing excess liquid developer from the surface of said photosensitive medium, and means for transferring the developed image onto a transfer medium.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |