Patent US3937872A successfully refreshed from Google Patents.
US3937872A
Expired / Lapsed
US
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Internal test method for facsimile transceiver
Assignee: Ricoh Co Ltd
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Filing: 1974-05-01
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Granted: 1976-02-10
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Expires: 1994-05-01
Abstract
Abstract The transmitting and receiving sections are both energized, and the output of the transmitting section is connected to the input of the receiving section. The intensity of the transmitting section light source is varied, as by opening and closing a switch, and if the output of the receiving section is accurate in response to the light source variation, the transmitting and receiving sections are judged to be operating normally.
Inventors
- 👤 Mitsuru Kondo
- 👤 Toshihiko Misawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00002; H04N1/00007; H04N1/00013; H04N1/00015; H04N1/00026; H04N1/00031; H04N1/00047; H04N1/00053; H04N1/00063; H04N1/00071; H04N1/00074; H04N1/00076; H04N1/0035; H04N1/00405; H04N1/00485
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A method of testing a facsimile transceiver having a transmitter section with a light source to illuminate the copy and a receiver section, the method comprising the steps of: energizing both the transmitter section and the receiver section; connecting the output of the transmitter section to the input of the receiver section; and varying the intensity of the lights source; whereby the correlation between the pattern produced by the receiver section and the variation in intensity of the light source is an indication of the normality of operation of the transceiver.
Claim 2
Independent Claim
91 words
A method of testing a facsimile transceiver having a transmitter section with a light source to illuminate the copy and a receiver section, the method comprising the steps of: energizing both the transmitter section and the receiver section; connecting the output of the transmitter section to the input of the receiver section; and varying the intensity of the lights source; whereby the correlation between the pattern produced by the receiver section and the variation in intensity of the light source is an indication of the normality of operation of the transceiver.
Claim 3
Dependent Claim
29 words
A method according to claim 1, in which the intensity of the light source is varied by means of a switch to turn the light source on and off.
Claim 4
Dependent Claim
25 words
A method according to claim 2, in which the pattern produced by the receiver section appears in the form of a line on the copy.
Claim 5
Dependent Claim
101 words
In a facsimile transceiver having a transmitter section with a light source to illuminate the copy and a receiver section, the improvement of a system to test the transceiver, comprising: switch means operative to energize both the transmitter section and the receiver section and connect the output of the transmitter section to the input of the receiver section for testing; and means to vary the intensity of the light source; whereby the correlation between the pattern produced by the receiver section and the variation of intensity of the light source is an indication of the normality of operation of the transceiver.
Claim 6
Dependent Claim
101 words
In a facsimile transceiver having a transmitter section with a light source to illuminate the copy and a receiver section, the improvement of a system to test the transceiver, comprising: switch means operative to energize both the transmitter section and the receiver section and connect the output of the transmitter section to the input of the receiver section for testing; and means to vary the intensity of the light source; whereby the correlation between the pattern produced by the receiver section and the variation of intensity of the light source is an indication of the normality of operation of the transceiver.
Claim 7
Dependent Claim
20 words
The improvement of claim 4, in which said means comprises a switch to turn the light source on and off.
Claim 8
Dependent Claim
28 words
The improvement of claim 4, in which said means comprises a rotatable mechanical member formed with a plurality of apertures disposed between the light source and the copy.
Claim 9
Dependent Claim
23 words
The improvement of claim 5, in which the pattern produced by the receiver appears in the form of a line on the copy.
Claim 10
Dependent Claim
26 words
The improvement of claim 4, in which said means comprises a shutter movable to and away from a position between the light source and the copy.
Claim 11
Dependent Claim
14 words
The improvement of claim 6, in which the apertures are circumferentially spaced radial slits.
Claim 12
Dependent Claim
13 words
The improvement of claim 6, in which the apertures are circumferentially spaced holes.
References Cited (Backward Citations)
US3598910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |