Patent US1356236A successfully refreshed from Google Patents.
Patent US3942939A successfully refreshed from Google Patents.
Patent US3874798A successfully refreshed from Google Patents.
US3874798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for contactless measuring of an object using separate opto-electrical devices for respective borders of object
Assignee: Pharos AB
•
Filing: 1973-06-06
•
Granted: 1975-04-01
•
Expires: 1993-06-06
Abstract
Abstract A method and apparatus for contactless measuring of a dimension of movable objects wherein opposite borders of an image of a movable object are projected in one dimension upon a respective one of a pair of opto-electrical devices, each of the optoelectrical devices being comprised of an array of light sensitive elements. The opto-electrical devices are scanned successively at a predetermined repetition rate, the scanning being performed with a simultaneous start from that end of each opto-electrical device which is covered or shadowed by the image of the object. The signals from the illuminated and shadowed-out light sensitive elements of the opto-electrical devices are then detected and the dimension of the object is then determined.
Inventors
- 👤 Leif-Goran Antonsson
- 👤 Joel Karl Gosta Redlund
- 👤 Karl Yngve Kjell Rosengren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:41
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/08; G01B11/10; G01B11/105
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
A method for contactless measuring of a dimension of movable objects comprising: projecting opposite borders of an image of a movable object in one dimension upon a respective one of a pair of opto-electrical devices, each of said opto-electrical devices being comprised of an array of light sensitive elements; scanning the luminous intensity of each of said opto-electrical devices successively at a predetermined repetition rate, the scanning being performed with simultaneous start from that end of each opto-electrical device which is covered or shadowed by the image of the object; detecting the signals from illuminated and shadowed out light sensitive elements for registering the relative positions of the borders of the object; and determining the dimension of the object from the results of the detecting step.
Claim 2
Independent Claim
126 words
A method for contactless measuring of a dimension of movable objects comprising: projecting opposite borders of an image of a movable object in one dimension upon a respective one of a pair of opto-electrical devices, each of said opto-electrical devices being comprised of an array of light sensitive elements; scanning the luminous intensity of each of said opto-electrical devices successively at a predetermined repetition rate, the scanning being performed with simultaneous start from that end of each opto-electrical device which is covered or shadowed by the image of the object; detecting the signals from illuminated and shadowed out light sensitive elements for registering the relative positions of the borders of the object; and determining the dimension of the object from the results of the detecting step.
Claim 3
Dependent Claim
44 words
A method according to claim 1 comprising stopping the scanning of each opto-electrical device as soon as an illuminated light sensitive element is detected so that shadowing roll scales, etc., outside the test object, do not have any effect on the results of measurement.
Claim 4
Dependent Claim
45 words
A method according to claim 1 comprising sensing the position of the shadow of the object at fixed intervals along the opto-electrical device; and supplying the sensed position to indicator lamps which indicate when the object is positioned symmetrically with regard to the opto-electrical devices.
Claim 5
Dependent Claim
68 words
A method according to claim 1 comprising generating test value validity information for each measurement, said test value validity information comprising information as to at least one of (a) no test object exists at the apparatus, (b) the shadow of the test object lies incorrectly and covers completely or not at all one of the opto-electrical components and (c) error in the shift register of the opto-electrical component.
Claim 6
Dependent Claim
38 words
A method according to claim 4 comprising clamping the test signal during the remaining part of the scanning in a suppression unit at a level which corresponds to an illuminated light sensitive element after having attained said level.
Claim 7
Dependent Claim
44 words
A method according to claim 1 wherein saiD image is projected upon said opto-electfical devices through a lens system which includes a telecentric diaphragm means so that errors caused by movements of the object section along the axis of the optical system are suppressed.
Claim 8
Dependent Claim
144 words
Apparatus for contactless measuring of a dimension of a movable object comprising: at least a pair of opto-electrical devices, each of which is comprised of an array of light sensitive elements; projecting means for projecting respective opposite borders of an optical image of the movable object in one dimension upon a separate one of said opto-electrical devices; scanning means for successively scanning the luminous intensity of said light sensitive elements of said pair of optoelectrical devices at a predetemined repetition rate, the scanning being performed with simultaneous start from that end of each opto-electrical device which is covered or shadowed by the image of the object; means for detecting the illuminated and shadowed out light sensitive elements for registering the relative positions of the border of the object; and means responsive to said detecting and registering means for determining the dimension of the object.
Claim 9
Dependent Claim
144 words
Apparatus for contactless measuring of a dimension of a movable object comprising: at least a pair of opto-electrical devices, each of which is comprised of an array of light sensitive elements; projecting means for projecting respective opposite borders of an optical image of the movable object in one dimension upon a separate one of said opto-electrical devices; scanning means for successively scanning the luminous intensity of said light sensitive elements of said pair of optoelectrical devices at a predetemined repetition rate, the scanning being performed with simultaneous start from that end of each opto-electrical device which is covered or shadowed by the image of the object; means for detecting the illuminated and shadowed out light sensitive elements for registering the relative positions of the border of the object; and means responsive to said detecting and registering means for determining the dimension of the object.
Claim 10
Dependent Claim
29 words
Apparatus according to claim 7 wherein said detecting and registering means includes a shift register in each opto-electrical device coupled to the outputs of the respective light sensitive elements.
Claim 11
Dependent Claim
20 words
Apparatus according to claim 7, including a clock-frequency generator coupled to and controlling the opto-electrical devices and said scanning means.
Claim 12
Dependent Claim
50 words
Apparatus according to claim 7 wherein said dimension determining means includes two counters, each receiving information from a separate one of the opto-electrical devices; and an adder coupled to receive the output information from said counters in parallel form to produce a sum indication representing said dimension of the object.
Claim 13
Dependent Claim
30 words
Apparatus according to claim 7 wherein said projecting means includes a telecentric diaphragm means for suppressing errors caused by movements of the object along the axis of the optical system.
Claim 14
Dependent Claim
13 words
Apparatus according to claim 7 wherein said light sensitive elements comprise photo diodes.
References Cited (Backward Citations)
US2552238A
Cited
US3224322A
Cited
US3141057A
Cited
US3311749A
Cited
US3428817A
Cited
US3673417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |