US3930150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determining the centroid of a lighted hole
Assignee: Digital Systems Inc
•
Filing: 1974-12-23
•
Granted: 1975-12-30
•
Expires: 1994-12-23
Abstract
Abstract Apparatus for determining the centroid of a lighted hole in a master template and recording the rectangular coordinates of the centroid comprising a rotating member having a photovoltaic chip radially disposed thereon is disclosed. A light source is passed through the subject hole in the master template, and focused on the photovoltaic chip. The value of the current generated by the photovoltaic chip which is proportional to the incident light on the chip, is periodically sampled and compared for controlling the movement of the support table upon which the master template rests.
Inventors
- 👤 William F Marantette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G01; G01B; G01B11/00; G01B11/002; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/49; G05B2219/49113
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
Apparatus for determining the centroid of a lighted hole comprising: a. means for supporting a template containing an image of at least one hole, said means being moveable; b. a photo-sensitive element in the form of a strip, illuminations of said photo-sensitive element resulting in an electrical signal dependent upon the amount of light striking said element; c. a means for projecting light through a hole in the template so as to strike said photo-sensitive element; d. means for rotating said photo-sensitive element about an axis; and e. circuit means for sampling the resultant electrical signal at at least a first and second rotational position of said photosensitive material, and comparing said signals, said circuit means providing a signal for activating means for moving said supporting means if said first and second signals are not equal.
Claim 2
Dependent Claim
136 words
Apparatus for determining the centroid of a lighted hole comprising: a. means for supporting a template containing an image of at least one hole, said means being moveable; b. a photo-sensitive element in the form of a strip, illuminations of said photo-sensitive element resulting in an electrical signal dependent upon the amount of light striking said element; c. a means for projecting light through a hole in the template so as to strike said photo-sensitive element; d. means for rotating said photo-sensitive element about an axis; and e. circuit means for sampling the resultant electrical signal at at least a first and second rotational position of said photosensitive material, and comparing said signals, said circuit means providing a signal for activating means for moving said supporting means if said first and second signals are not equal.
Claim 3
Dependent Claim
117 words
The apparatus of claim 1 in which said signal is sampled at a first position and at a position every 90* of rotation of said photo-sensitive element from said first position. Said signal sampled at said first position being compared with the signal at a second position 180* of rotation from said first position for activating a means for moving said supporting means in a first direction and said signal at a third position 90* from said first position being compared with the signal at a fourth position 270* from said first position for activating means for moving said supporting means in a second direction when said signals at said third and fourth positions are not equal.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 in which the axis about which said photo-sensitive element is rotated is perpendicular to the plane of the surface of the hole in the template.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1 in which the axis about which said photo-sensitive element is rotated is at an angle to the axis of the hole in the template.
Claim 6
Dependent Claim
23 words
The apparatus of claim 1 in which said strip of photo-sensitive material is rotated about an axis about one end of said strip.
Claim 7
Dependent Claim
19 words
The apparatus of claim 5 in which the strip of photo-sensitive material is radially mounted on a support disc.
Claim 8
Dependent Claim
44 words
The apparatus of claim 5 in which the image of the hole in the template is focused on the photo-sensitive element, the centroid of the hole being located when the centroid of the image is aligned with the axis of rotation of said strip.
Claim 9
Dependent Claim
14 words
The apparatus of claim 5 in which said photo-sensitive element is a photovoltaic material.
References Cited (Backward Citations)
US3293439A
Cited
US3346739A
Cited
US3458651A
Cited
US3517204A
Cited
US3535525A
Cited
US3532892A
Cited
US3716716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |