GB873790A - Improvements in or relating to apparatus for the comparison of objects - Google Patents
Improvements in or relating to apparatus for the comparison of objectsInfo
- Publication number
- GB873790A GB873790A GB34472/58A GB3447258A GB873790A GB 873790 A GB873790 A GB 873790A GB 34472/58 A GB34472/58 A GB 34472/58A GB 3447258 A GB3447258 A GB 3447258A GB 873790 A GB873790 A GB 873790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- images
- light intensity
- backgrounds
- scanned
- oct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003086 colorant Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/08—Optical projection comparators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
873,790. Electric copying machines. FERNSEH G.m.b.H. Oct. 28, 1958 [Oct. 29, 1957], No. 34472/58. Drawings to Specification. Class 38 (6). [Also in Group XL (b)] The images of the template and the workpiece in a copying machine are projected simultaneously on to the photo-cathode of a television camera tube, so that any lack of register produces an area having a distinct light intensity or hue, which produces pulse signals when the tube is scanned. The images are combined either by means of a partially reflecting mirror, Fig. 1 (not shown, or a prism, Fig. 4 (not shown). It is stated that the two objects are illuminated so as to contrast with their backgrounds. At the same time the light intensity due to the two images in coincidence is made equal to the light intensity due to images of the two backgrounds which are also being projected on to the photocathode. It is suggested that object and background could be in contrasting colours. The electrical output of the camera tube may either be displayed on a television receiver or used to control the position of the grinding wheel of a copying machine in which a single line is scanned at the working point and the grinding wheel is advanced or retracted in an undisclosed way according to the presence or absence of a pulse. It is stated that the control signals for the whole process can first be stored and then read out.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE873790X | 1957-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873790A true GB873790A (en) | 1961-07-26 |
Family
ID=6816609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34472/58A Expired GB873790A (en) | 1957-10-29 | 1958-10-28 | Improvements in or relating to apparatus for the comparison of objects |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB873790A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2448147A1 (en) * | 1979-02-01 | 1980-08-29 | Hajime Industries | APPARATUS FOR DETECTING PATTERN FAULTS |
| GB2135448A (en) * | 1982-12-15 | 1984-08-30 | Sira Ltd | Inspection apparatus and method |
-
1958
- 1958-10-28 GB GB34472/58A patent/GB873790A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2448147A1 (en) * | 1979-02-01 | 1980-08-29 | Hajime Industries | APPARATUS FOR DETECTING PATTERN FAULTS |
| GB2135448A (en) * | 1982-12-15 | 1984-08-30 | Sira Ltd | Inspection apparatus and method |
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