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A device is described which will operate as both a bar code reader and a light pen for a computer display.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
61% of the total text.
Page 1 of 1
Combination Bar Code Reader And Display Selector Pen
A device is described which will operate as both a bar code reader and a light
pen for a computer display.
The device comprises a cylindrical structure with a hollow cone shaped tip,
an electronic cable passing through the other end, and electronics consisting of a
light source and a photodetector.
The light source is only active when the device is operating as a bar code
reader. The photodetector is used to detect the reflected light from a bar code
and also to detect the light emitted from a computer display such as a CRT when
the device is operating as a light pen. The mode the device should be operating
in is determined by the motion of the device. Reading a bar code requires
moving the device across the bar code. Therefore, any time that the device is
moving, the light source is enabled, and the electronics are switched to enable
the circuits that decode the bar code. Using the device as a light pen as a
selection device requires that the device be at a stationary position before it
begins detecting the CRT light emitted. Since one use requires the device to be
in motion, and the other requires the device to be stationary, a system to detect
motion is required.
The motion detection section consists of a cylindrical unit which has an outer
diameter which is the same as the inner diameter of the system cylinder. One
half of the circumference of the unit is a relatively dense conductive metal. The