Patent US3814845A successfully refreshed from Google Patents.
US3814845A
Expired / Lapsed
US
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Object positioning
Assignee: AT&T Inc
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Filing: 1973-03-01
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Granted: 1974-06-04
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Expires: 1993-03-01
Abstract
Abstract An object, such as a beam-leaded semiconductor chip, is accurately positioned, despite irregularities in its edges. A television camera produces video signals representing line-byline scannings of the object. Video signals representing object edge position markers are also generated. The amount of overlap between the marker signals and the camera signals is measured over a plurality of line scans, and the results of these measurements are averaged. This average is used to control object position.
Inventors
- 👤 R Hurlbrink
- 👤 L Montone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:07
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/50; H10P72/53
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
In a method of positioning an object which involves scanning said object with a television camera along a multiplicity of lines, deriving video signals representing said line scannings of said object, and generating additional video signals which represent scannings along a multiplicity of lines of a positioning marker for said object, the improvement which comprises: detecting the amount of overlap between said object signals and said marker signals along any given scanning line; averaging said detected amounts of overlap over a plurality of said scanning lines; and utilizing said averaged amounts to control the position of the object.
Claim 2
Dependent Claim
98 words
In a method of positioning an object which involves scanning said object with a television camera along a multiplicity of lines, deriving video signals representing said line scannings of said object, and generating additional video signals which represent scannings along a multiplicity of lines of a positioning marker for said object, the improvement which comprises: detecting the amount of overlap between said object signals and said marker signals along any given scanning line; averaging said detected amounts of overlap over a plurality of said scanning lines; and utilizing said averaged amounts to control the position of the object.
Claim 3
Dependent Claim
44 words
In the method of claim 1, the further step of: displaying a plurality of the positioning markers and an image of said object on a television monitor; and adjusting said marker signals so that said displayed markers overlap respective edge portions of said object.
Claim 4
Dependent Claim
32 words
In the method of claim 1, the further step which comprises: controlling the generation of said additional video signals so that they represent scannings of markers overlapping opposite edges of said object.
Claim 5
Dependent Claim
21 words
The method steps of claim 3, wherein the positioning is controlled so as to substantially equalize said overlaps of opposite edges.
Claim 6
Dependent Claim
34 words
In the method of claim 1, the further step which comprises: controlling the generation of said additional signals so that they represent scannings of markers which overlap several spaced-apart edge portions of said object.
Claim 7
Dependent Claim
23 words
The method steps of claim 5, wherein said positioning is controlled so as to substantially equalize said overlaps of the respective edge portions.
Claim 8
Dependent Claim
27 words
The method steps of claim 5, further characterized in that said object has four generally rectangular edges, and said markers respectively overlap all four of said edges.
Claim 9
Dependent Claim
20 words
The method steps of claim 7, wherein said positioning is controlled to center said object between opposing pairs of markers.
Claim 10
Independent Claim
99 words
A system for controlling the position of an object comprising: means for producing video signals representing the scanning of said object along a multiplicity of scanning lines; means for generating additional signals representing the scanning of a position marker extending over segments of a plurality of adjacent ones of said scanning lines; means for detecting the amount of overlap between said video signals and said additional signals along any given scanning line; means for averaging said detected amounts over a plurality of said scanning lines; and means for utilizing said detected average to control the position of said object.
Claim 11
Independent Claim
99 words
A system for controlling the position of an object comprising: means for producing video signals representing the scanning of said object along a multiplicity of scanning lines; means for generating additional signals representing the scanning of a position marker extending over segments of a plurality of adjacent ones of said scanning lines; means for detecting the amount of overlap between said video signals and said additional signals along any given scanning line; means for averaging said detected amounts over a plurality of said scanning lines; and means for utilizing said detected average to control the position of said object.
Claim 12
Dependent Claim
59 words
The system of claim 9 further comprising: a television monitor; means for supplying said video signals and said additional signals to said monitor so as to display thereon images of said object and of said markers; and means for positioning said displayed markers so as to overlap respectively the desired positions of the different edges of said object image.
Claim 13
Dependent Claim
29 words
The system of claim 10, wherein said object is a beam-leaded semiconductor chip and said edges are the tips of the beam leads which form part of said chip.
Claim 14
Dependent Claim
54 words
The system of claim 9, wherein said averaging means comprises a step charge circuit, means for charging said circuit in a plurality of steps respectively representative of said detected amount of overlap along different ones of said plurality of lines, and means for discharging said circuit between recurrent scannings of said plurality of lines.
Claim 15
Dependent Claim
45 words
The system of claim 12, wherein said detecting means comprises a gate circuit responsive to overlap between said video signals and said additional signals to produce an output signal proportional to said overlap, and means for supplying said output signal to said step charge circuit.
Claim 16
Dependent Claim
46 words
The system of claim 13, further comprising an oscillator producing a signal of such frequency that a plurality of cycles occur during each said overlap, and means for supplying to said step charge circuit a number of said cycles determined by said gate circuit output signal.
Claim 17
Dependent Claim
57 words
The system of claim 14, wherein said gate circuit comprises capacitor storage means, an input circuit for charging said storage means with said supplied oscillator signal cycles, means for feeding back to said input circuit a voltage proportional to the charge on said storage means, and means for deriving an output signal proportional to said feed-back voltage.
Claim 18
Dependent Claim
22 words
The system of claim 14, wherein said means for discharging said step charge circuit comprises means for discharging said capacitor storage means.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |