I recently acquired a very early Mitsubishi drawing tablet. The information I can find online is sparse, so I will tear it down and do some literature searches. Before doing the teardown, I knew nothing about this tablet except that it was made sometime in the 1980s. Cardboard box Accessories My device comes with a pen and a pointing device. At this point, I'm sure it's not based on the inductor resonant technology WACOM is known for: The pen is metallic, with only a very sharp metal tip. The pointing device also has a small ring, the electronic coupling element. This means that the coupling mechanism is not inductive but capacitive. In other words, it's more akin to the Apple Pencil. Later, I found a patent for that pointing device and confirmed it uses a capacitive technology. Also, the pen and the pointing device are tethered, so I'm expected to find a simple signal chain design. US 5,041,820 filed in 1987 by Pentel Co Ltd The tablet itself Taking a peek inside Open...
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