Position encoding arrangements
First Claim
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1. A position encoding arrangement comprising means defining a position locating area;
- means for providing an at least approximate indication of the value of at least one positional co-ordinate of a probe introduced into the area, and means for changing the magnification of the arrangement to improve the accuracy of the positional co-ordinate whereby a movement of the probe over the area produces a scaled down change in the indicated positional co-ordinate value to produce a fine adjustment of said positional co-ordinate.
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Abstract
A position encoding arrangement is provided having a position locating area from which the positioned co-ordinates of a probe in the area can be found. The invention provides for a change of magnification of the arrangement so that movement of the probe produces a scaled down change in positional co-ordinates. A preferred embodiment provides a light beam encoder for use in conjunction with a C.R.T. type display where a probe is detected and a marker appears on the screen. With the invention change in magnification allows scaled down movement of the marker to allow accurate positioning.
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Citations
14 Claims
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1. A position encoding arrangement comprising means defining a position locating area;
- means for providing an at least approximate indication of the value of at least one positional co-ordinate of a probe introduced into the area, and means for changing the magnification of the arrangement to improve the accuracy of the positional co-ordinate whereby a movement of the probe over the area produces a scaled down change in the indicated positional co-ordinate value to produce a fine adjustment of said positional co-ordinate.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A position encoding arrangement comprising, in combination:
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means defining a plurality of positional co-ordinates within a given area; means responsive to the presence of a probe adjacent said area for initially encoding the location of at least one positional co-ordinate of said probe according to a first code to provide positional information about said probe; and means responsive to continued presence of said probe adjacent said area for altering said encoding to a second code having greater resolution than said first code whereby movement of the probe over said area produces a change in said positional information which is scaled down with respect to the positional change of said probe.
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14. In a position encoding arrangement including a display indicating at least one target location within a given area, the combination of:
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means defining a plurality of positional co-ordinates within said given area; means responsive to the presence of a probe adjacent said area for initially encoding the position of said probe according to the scale of said positional co-ordinates and for correspondingly displaying the position of said probe at one of said positional co-ordinates; and means responsive to continued presence of said probe adjacent said area for magnifying the initial encoding whereby movement of said probe over said area causes a scaled down movement of the probe display to permit accurate registry of said probe display with said target location.
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Specification