 Element Pitch
and Output Signal |
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Resolution
depends on the element pitch. |
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| 1. With standard detecting
elements, a circuit is created with two elements mounted on a single
chip. |
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| <Dimensions
of Standard Elements> |
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| (1) |
The elements are designed according to the
dimensions of the patterns on the target media and the purpose of
detection. |
| (2) |
To detect dense patterns, reduce the element
pitch (0.75 mm). To detect wide patterns, increase the detecting width
(3 mm). |
| (3) |
The thickness and quality of the substrate is
selected to optimize the magnetic circuit. |
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| 2. Pitch of magnetic media
and output characteristics |
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- The sensor's detecting width is 3 mm, element pitch
is 0.75 mm, and element width is 0.3 mm.
- The detected media are magnetic ink patterns with low
coercivity.
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| (1) |
When the pattern pitch is "p" and the element
pitch is p/2, the SN ratio becomes the maximum value. For example, when
the element pitch is 0.75, the pattern pitch is 1.5 mm. |
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| (2) |
When the pattern pitch is reduced to 0.7 mm, the
resolution is decreased. |
| (3) |
When the pattern pitch is reduced to 0.5 mm or
less, the sensor recognizes two separate patterns as one, but the
magnetic intensity of the two patterns is still measured. |
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