JPH01120242U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of the writing pad taken along the line - in Fig. 2; Fig. 2 is a bottom view of the writing pad;
Figure 3 shows the second part of the write pad without resistive coating.
Figures similar to Figure 4, Figure 4 is a circuit diagram, Figure 5 is Figure 4.
Variations of the figures are shown, with FIG. 6 being a further circuit diagram of the writing pad and FIG. 7 being a schematic representation of part of an alternative arrangement of the writing pad. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Sheet, 3... Low resistance layer, 4... Medium resistance edging layer, 5... High resistance coating layer, 6... Connector, 10... Extension wire, 11... Division layer, 12, 13...
Flexible sheet, 14, 19... switch, 15...
Voltage measuring means, 16... Converter, 17... Character processor, 18... Power supply, 20... Operational amplifier, 21... Transistor amplifier circuit, 22... Transistor, 23
...Smoothing circuit.

Claims (1)

[Scope of claims for utility model registration] 1. A character recognition device using a writing pad,
The write pad has the following components: a robust substrate of non-conductive material; a low resistance layer applied to said substrate; a series of connector portions, a conductive lead extending between the corner portion and the connector portion, and a first extension line extending from the corner portion and a conductive lead extending between the corner portion and the connector portion.
a second extension line extending between the two corner portions, further comprising a substantially rectangular layer of medium resistance material applied to the substrate, the medium resistance layer being at least partially defined by the four corner portions; overlapping each of the two corner portions and each of the second extensions of the low resistance layer, further comprising a high resistance material layer applied to the substrate, the high resistance material layer overlapping each of the second extensions of the low resistance layer; extending continuously over an inner region of the substantially rectangular medium resistance layer and at least partially overlapping the medium resistance layer; a series of voltage variable adjustment pattern portions comprising a layer of material, the pattern portions at least partially overlapping the first and second extensions, the pattern portions having a configuration that the voltage gradient to be generated along the length and width of the layer is linear; and furthermore, a replaceable insulating cushion is provided above the high resistance layer at least inside said medium resistance layer. The cushion body has a cushion layer in which a layer region made of an insulating material is interposed, and the cushion layer is formed between the cushion layer and the high-resistance layer under the application of pressure by a writing tool. A character recognition device characterized in that it is configured such that a circuit can be formed. 2. One sheet of the writing pad has a plurality of connection areas in conductive relationship with the high resistivity portion, the connection areas forming one edge of the writing pad for connection to an electrical switching circuit. Claim 1, which is connected to a connector provided in the connector via a conductive connection layer.
Character recognition device described in section. 3. A plurality of regions formed from a high resistivity material are formed around a high resistivity central portion such that the regions are selectively connected to the high resistivity central portion by a connecting portion. The character recognition device according to scope 1 or 2. 4. The character recognition device according to claim 1, wherein the sheets of the writing pad are held apart by an intervening spacer layer. 5. The intervening spacer layer has two dividing layers;
5. A character recognition device according to claim 4, wherein a layer of non-conductive dielectric elastomeric gel material is provided between the divided layers. 6. The character recognition device according to claim 2, wherein the connection area includes a rectangular connection area arranged adjacent to each corner of the central high resistivity portion. 7. The character recognition device of claim 6, wherein additional connection areas are provided at opposite edges of the central high resistivity portion intermediate between the corner connection areas.