Patent US4493993A successfully refreshed from Google Patents.
US4493993A
Expired / Lapsed
US
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Apparatus for optically detecting ink droplets
Assignee: Unisys Corp
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Filing: 1982-11-22
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Granted: 1985-01-15
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Expires: 2002-11-22
Abstract
Abstract Ink jet printers include orifices which may become clogged or otherwise inoperative. This can cause printing defects which may go undetected for a substantial period because these printers usually operate unattended. An optical detector is provided for testing the operability of each ink jet orifice prior to the beginning of printing either a print cycle or a page. Ink is deposited on a member which moves the deposit through an optical path for detection. Absence of a deposit signals a malfunction.
Inventors
- 👤 Franz X. Kanamuller
- 👤 Edwin R. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:11
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; B41J2/16579
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
An apparatus for optically detecting ink droplets comprising: light emitting means operably connected to said apparatus for emitting a light signal; light receiving means operably connected to said apparatus receiving said light signal; light relaying means operable for relaying said light signal from said emitting to said receiving means, said relaying means movable from a first position wherein ink is deposited thereon to a second position wherein said deposited ink interrupts relay of said light signal.
Claim 2
Independent Claim
76 words
An apparatus for optically detecting ink droplets comprising: light emitting means operably connected to said apparatus for emitting a light signal; light receiving means operably connected to said apparatus receiving said light signal; light relaying means operable for relaying said light signal from said emitting to said receiving means, said relaying means movable from a first position wherein ink is deposited thereon to a second position wherein said deposited ink interrupts relay of said light signal.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 including: means for cleaning said ink from said light relaying means in response to said light relaying means moving to a third position.
Claim 4
Dependent Claim
17 words
The apparatus of claim 2 wherein said relaying means is mounted on a member for rotating movement.
Claim 5
Dependent Claim
21 words
The apparatus of claim 3 including: means operably connected for rotating said relaying means through said first, second and third positions.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 including: a lens mounted adjacent said light receiving means.
Claim 7
Dependent Claim
14 words
The apparatus of claim 5 wherein said light relaying means is a transparent disk.
Claim 8
Dependent Claim
38 words
The apparatus of claim 6 wherein said light receiving means and said lens are adjacent a first surface of said disk and said light emitting means is adjacent a second surface of said disk opposite said first surface.
Claim 9
Dependent Claim
27 words
The apparatus of claim 7 wherein said light emitting means is positioned to emit a light signal through said transparent disk and to said light receiving means.
Claim 10
Dependent Claim
27 words
The apparatus of claim 8 wherein said lens is positioned to magnify said ink deposit sufficient to block said light signal received by said light receiving means.
Claim 11
Dependent Claim
14 words
The apparatus of claim 5 wherein said light relaying means includes a reflective surface.
Claim 12
Dependent Claim
22 words
The apparatus of claim 10 wherein said light emitting means, said lens and said light receiving means are adjacent said reflective surface.
Claim 13
Dependent Claim
43 words
The apparatus of claim 11 wherein said light emitting means is positioned to emit a light signal to said reflective surface and said light receiving means is positioned to receive said signal in response to said signal being reflected from said reflective surface.
Claim 14
Dependent Claim
27 words
The apparatus of claim 12 wherein said lens is positioned to magnify said ink deposit sufficient to block said light signal received by said light receiving means.
References Cited (Backward Citations)
US3870884A
Cited
US3956987A
Cited
US3958509A
Cited
US4176363A
Cited
GB2012213A
Cited
SU719895A1
Cited
GB2022514A
Cited
FR2444300A1
Cited
JPS5587554A
Cited
US4255754A
Cited
US4328504A
Cited
US4323905A
Cited
US4410895A
Cited
US4392142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |