Topic
Track Marks
About: Track Marks is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 61 citations.
Papers
Patent•
6 Apr 1984
TL;DR: A servo tracking system for an optical record uses a pattern of preformed optically detectable uniform servo track marks disposed in parallel spaced apart columns in combination with a beam from a radiation source split by a diffraction grating into three beams having unequal power distribution.
Abstract: A servo tracking system for an optical record uses a pattern of preformed optically detectable uniform servo track marks disposed in parallel spaced apart columns in combination with a beam from a radiation source split by a diffraction grating into three beams having unequal power distribution. The placement of the beams across the pattern of preformed servo tracks on an optical recording material has one position for writing data by the center beam on an information track while the two outside beams intercept track marks on two adjacent tracks. For reading recorded data tracks, the beams shift to a second position in which the center beam intercepts marks on a servo track while the two outside beams read two adjacent data tracks. Because of the unequal power distribution, increasing the energy level of the radiation source causes the intensity of the middle beam during recording to reach a level sufficient to record while the two outside tracking beams remain below that threshold. The track marks in adjacent columns may be in an offset position with regard to track marks of the adjoining column, to provide self-clocking during recording.
52 citations
Journal Article•
TL;DR: This article illustrates a dermatological presentation associated with injecting drug use, with track marks, injection site marks and skin abscesses among the less commonly known manifestations.
Abstract: BACKGROUND Many illicit drugs can be injected, with this mode of administration associated with a range of skin morbidities. OBJECTIVE This article illustrates a dermatological presentation associated with injecting drug use. DISCUSSION Track marks, injection site marks and skin abscesses are well known to be associated with injecting drug use. However, there are other dermatological manifestations that are less commonly known. Signs may be more subtle, particularly when drug use is recreational and patients do not fit commonly held stereotypes of injecting drug users.
7 citations
Patent•
30 Apr 1970
TL;DR: In this article, a method and apparatus for precisely checking the accuracy of the placing of timing track marks or bits on the periphery of a rotating recording member, such as a magnetic disc or drum, where the spaces between all the timing track points or bits must be exactly equal and the variations in spacing, if any, cannot be electronically measured.
Abstract: A method and apparatus for precisely checking the accuracy of the placing of timing track marks or bits on the periphery of a rotating recording member, such as a magnetic disc or drum, where the spaces between all the timing track marks or bits must be exactly equal and the variations in spacing, if any, cannot be electronically measured. The timing track bits or marks are written during one revolution of the disc or drum and then read back and used as one input to a comparator. The timing track is erased and then the timing track bits are written during two successive resolutions of the disc or drum and read back as the other input to the comparator. If the amplitudes of the two inputs to the comparator are equal then the writing during the second of the two successive revolutions was directly on top of the writing during the first of the two successive revolutions and all the bit spaces are equal.
2 citations
Patent•
28 Jan 2000
TL;DR: In this paper, the authors proposed a position detector for stop controller for moving objects with which the position of a moving object can be detected with high accuracy and the amount of a deviation from a preset stop position can also be detected.
Abstract: PROBLEM TO BE SOLVED: To provide a position detector for stop controller for moving object with which the position of a moving object can be detected with high accuracy and the amount of a deviation from a preset stop position can be detected with high accuracy. SOLUTION: As the moving object, an unmanned carrier 1 is traveled on a traveling road to which track marks 2 are added on both sides. At the time of traveling, as an image pickup means, a lens 6 forms the images of the track marks 2 arranged on both the sides along with the traveling road on a CCD sensor 5 as a one-dimensional(1D) imaging device, by scanning the CCD sensor 5, a 1D image signal is extracted and the position data of the track marks 2 on both the sides are contained in these image data. As a breadthwise deviation amount calculating means, an arithmetic processing part 20 calculates the deviation between a midpoint CK on the center line of both the track marks 2 and a midpoint Ca on the CCD line sensor 5 as the amount of the deviation on the breadthwise direction of the track for the unmanned carrier 1. Besides, the arithmetic processing part calculates the amount of the deviation between the current position line of the unmanned carrier 1 and a stop line from the image data of a stop position mark 3 added on the traveling road at a stop position.
2 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2004 | 1 |
| 2000 | 1 |
| 1984 | 1 |
| 1970 | 1 |