Hiroo Wakaumi

Highly-reliable semi-autonomous vehicle control on lattice lane

The vehicle curve movement reliability has been improved by a variable curve movement radius control technique involving a curve angle monitoring method and a nonlinear fuzzy control technique. In consequence, the successful rate achieved for an obstacle avoidance movement has risen from 96% in conventional curve movement technique up to 98%.<<ETX>>

Grooved bar-code pattern recognition system with magnetoresistive sensor

A magnetic bar-code pattern recognition system with a magnetoresistive sensor is proposed. The bar-code consists of a set of grooves on an iron plate, similar to an optical bar-code pattern. When a magnet passes above the grooves on an iron plate, the magnetic field produced by the magnet is bent by the grooves. The bar-code pattern of grooves can be reconstructed by detecting the bend using the magnetoresistive sensor. Computer simulation results on magnetic flux density distribution near the grooves are presented, and prototype recognition systems with a magnetoresistive sensor are described. It is shown that a two-groove bar-code configuration with different groove depths depending on groove width and a thin-film magnetoresistive sensor construction are useful in realizing high-resolution detection systems. >

Grooved bar-code recognition system with tape-automated-bonding head detection scanner

Optical bar-code detection systems are not usable for goods management in dirty factories or in outdoor environments. For such applications, a novel bar-code scanner with a tape-automated-bonding (TAB) head structure, which allows highly sensitive detection and increased height detection, has been developed. with this scanner the gap between the magnetoresistive sensor and the scanner head tip is reduced to half of that in a conventional head scanner. This structure is effective for recognizing a high-density bar code at a 0.15-mm-higher detection height than in a conventional bar-code scanner. Using a grooved bar code plate with two different groove structures reduces mutual magnetic interference, and the detection height is improved by 0.05 mm compared to a single-groove structure. It was experimentally confirmed that the newly developed bar-code scanner with a TAB head structure is not affected at all by contaminating substances.

A high-speed 12-layer two-dimensional bar code detection system with wideband photodetection amplifier and balanced raster scanner

A high-speed 12-layer 2D bar-code detection system (BCDS) consisting of a photodetection amplifier with an amplification-type current-voltage converter and a balanced raster scanner combined with the complementary light emission drive method for laser diodes, has been developed in order to provide both a high effective scanning speed and multi-layer bar-code detection. This BCDS performs 1,250 scan/s, which is two and a half times the scanning speed of a conventional bar-code detection system. A new theoretical modulation model that gives an accurate model for laser scanning beam traces obtained by the balanced raster scanner is proposed. This model allows an optimum BCDS to be designed easily.