US3744905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring and marking aperture masks
Assignee: GTE Sylvania Inc
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Filing: 1971-06-24
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Granted: 1973-07-10
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Expires: 1991-06-24
Abstract
Abstract An apparatus for measuring and marking aperture masks for color television cathode ray tubes according to hole size utilizing a light source positioned on one side of the mask and a light detection means positioned on the other side. Upon receiving the portion of light which passes through the mask, the light detection means converts the light to a first electrical signal and sends this signal to a comparing means, which simultaneously receives a second signal representative of the proper hole size designated for the mask from a selection means. Should the two signals compare favorably, a control signal is derived which actuates a marking means for consequently marking the measured mask. Should the two signals not compare, the measured mask is not marked and is therefore rejected.
Inventors
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:32
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; G; G01; G01B; G01B11/00; G01B11/08; G01B11/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
203 words
Apparatus for measuring and marking individual aperture masks for cathode ray tubes according to hole sizes of said aperture masks, said apparatus comprising: first and second light sources positioned on one side of said aperture mask, each of said light sources adapted for providing a light beam to said side of said mask at a pre-established position on said mask; first and second light detection means positioned on the opposite side of said aperture mask from said first and second light sources, said first light detection means adapted for providing a first electrical signal representative of that portion of the light beam from said first light source which passes through said holes of said aperture mask, said second light detection means adapted for providing a second electrical signal when the light beam from said second light source strikes a non-translucent area of said aperture mask; selection means for pre-selecting a third electrical signal representative of a given hole size desirable for said aperture mask; means for comparing said first and third electrical signals and deriving a control signal upon the occurrence of said second electrical signal; and means for marking said aperture mask in accordance with said control signal from said comparing means.
Claim 2
Dependent Claim
203 words
Apparatus for measuring and marking individual aperture masks for cathode ray tubes according to hole sizes of said aperture masks, said apparatus comprising: first and second light sources positioned on one side of said aperture mask, each of said light sources adapted for providing a light beam to said side of said mask at a pre-established position on said mask; first and second light detection means positioned on the opposite side of said aperture mask from said first and second light sources, said first light detection means adapted for providing a first electrical signal representative of that portion of the light beam from said first light source which passes through said holes of said aperture mask, said second light detection means adapted for providing a second electrical signal when the light beam from said second light source strikes a non-translucent area of said aperture mask; selection means for pre-selecting a third electrical signal representative of a given hole size desirable for said aperture mask; means for comparing said first and third electrical signals and deriving a control signal upon the occurrence of said second electrical signal; and means for marking said aperture mask in accordance with said control signal from said comparing means.
Claim 3
Dependent Claim
20 words
The apparatus according to claim 1 in which each of said light detection means comprises a phototube and amplifier circuit.
Claim 4
Dependent Claim
30 words
The apparatus according to claim 1 in which said selection means comprises a switching means selectively coupling a potential source to said means for comparing said first and third signals.
Claim 5
Dependent Claim
84 words
The apparatus according to claim 1 in which said means for comparing said first and third electrical signals and deriving a control signal upon the occurrence of said second electrical signal comprises an analogue to digital converter for receiving said first and second electrical signals from said first and second light detection means, respectively, and for proviDing a digital signal therefrom, and a digital comparator connected to said converter for comparing said digital signal to said third electrical signal and deriving said control signal.
Claim 6
Dependent Claim
48 words
The apparatus according to claim 1 in which said means for marking said aperture mask comprises a stamping member adapted to stamp a preselected area of said aperture mask, said stamping member being actuated by said control signal from said means for comparing said first and third signals.
Claim 7
Dependent Claim
35 words
The apparatus according to claim 4 in which said selection means comprises a switching means selectively coupling a potential source to said digital comparator of said means for comparing said first and third electrical signals.
Claim 8
Independent Claim
161 words
An apparatus for measuring and marking individual aperture masks for cathode ray tubes according to hole sizes of said aperture masks, said apparatus comprising: a light source positioned on one side of said aperture mask for providing a light beam to said side of said mask at a pre-established position on said mask; a light detection means positioned on the opposite side of said aperture mask for providing a first electrical signal representative of that portion of said light beam which passes through said holes of said aperture mask at said pre-established position on said mask; selection means for preselecting a plurality of second electrical signals representative of a plurality of hole sizes desirable for said aperture mask; means for comparing said first electrical signal to said plurality of second electrical signals and deriving a control signal; and means for marking said aperture mask in accordance with said control signal from said means for comparing said first and second electrical signals.
Claim 9
Independent Claim
161 words
An apparatus for measuring and marking individual aperture masks for cathode ray tubes according to hole sizes of said aperture masks, said apparatus comprising: a light source positioned on one side of said aperture mask for providing a light beam to said side of said mask at a pre-established position on said mask; a light detection means positioned on the opposite side of said aperture mask for providing a first electrical signal representative of that portion of said light beam which passes through said holes of said aperture mask at said pre-established position on said mask; selection means for preselecting a plurality of second electrical signals representative of a plurality of hole sizes desirable for said aperture mask; means for comparing said first electrical signal to said plurality of second electrical signals and deriving a control signal; and means for marking said aperture mask in accordance with said control signal from said means for comparing said first and second electrical signals.
Claim 10
Dependent Claim
36 words
The apparatus according to claim 7 in which said selection means comprises a plurality of switches, each of said switches selectively coupling a potential source to said means for comparing said first and second electrical signals.
Claim 11
Dependent Claim
31 words
The apparatus according to claim 7 in which said light detection means comprises a phototube and amplifier circuit to convert said portion of said light beam to said first electrical signal.
Claim 12
Dependent Claim
87 words
The apparatus according to claim 7 in which said means for comparing said first electrical signal with said plurality of second electrical signals and deriving a control signal comprises an analogue to digital converter for receiving said first electrical signal from said light detection means and for providing a digital signal to each of a plurality of digital comparators, each of said digital comparators adapted for comparing said digital signal to a plurality of said second electrical signals from said selection means and deriving said control signal.
Claim 13
Dependent Claim
54 words
The apparatus according to claim 7 in which said means for marking said aperture mask comprises a plurality of stamping members, each of said stamping members adapted for stamping a pre-selected area of said aperture mask and being actuated by said control signal from said means for comparing said first and second electrical signals.
Claim 14
Dependent Claim
44 words
The apparatus according to claim 10 in which said selection means comprises a plurality of switching means each of said switching means selectively coupling a potential source to one of said digital comparators of said means for comparing said first and second electrical signals.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |