Japanese robotics

• 1. Introduction

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  Japanese robotics begins not with silicon and steel, but with a small wooden doll carrying a cup of tea. During the Edo period, between 1603 and 1867, craftsmen in Japan built karakuri ningyo, mechanical dolls capable of remarkably human-like acts. One craftsman, Hisashige Tanaka, earned the nickname "Japan's Edison" by creating toys that could fire arrows drawn from a quiver, serve tea to a guest, or paint a kanji character with a brush. His era's landmark manual, Karakuri Zui, or Illustrated Machinery, was published in 1796 and laid out the principles these artisans worked by.

  From those wooden gears, Japan would go on to build the world's first full-scale humanoid intelligent robot, send a robot astronaut to the International Space Station, and employ more than a quarter of a million industrial robots in its factories. The country is now the second-largest user of industrial robots in the world, behind only China. Robotics revenue was expected to reach 70 billion dollars by 2025.

  How did a tradition of mechanical puppets become a global industrial force? What does Japan actually build, and why does it build so much of it? And what does a robot designed to train dentists have in common with a therapeutic baby seal? Those questions run through everything that follows.

• 2. The First Humanoid

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  In 1928, a biologist named Makoto Nishimura designed and built a robot called Gakutensoku. This was decades before the word "robot" had settled into common usage, and yet Nishimura was already thinking about machines that resembled people.

  The deeper turning point came from Waseda University, where professor Ichiro Kato launched the WABOT project in 1967. Five years later, in 1972, his team completed WABOT-1. It had two arms, walked on two legs, and perceived the world through two camera eyes. Its limb control system let it grip and carry objects using tactile sensors in its hands. Its vision system measured distances and directions to objects using what the researchers called artificial eyes and ears. Its conversation system let it speak Japanese through an artificial mouth.

  WABOT-1 was, by the team's own framing, the world's first full-scale humanoid intelligent robot. It was also, technically, the first android. That claim rests on the combination of upright bipedal movement, manipulative hands, vision, and language in one machine.

  In 1996, Honda announced its P2 humanoid robot, which acted as an incentive for companies and universities across Japan to build their own humanoid platforms. That announcement touched off a wave of development that would produce, among others, ASIMO from Honda, QRIO from Sony, and Toyota's Partner Robot series.

• 3. What Japan Actually Builds

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  Actroid, a realistic female robot, was first demonstrated publicly at Expo 2005 in Japan. She was designed to look human in a way that went well beyond prior attempts, and her presence at the Expo made clear that Japan's robot landscape was unusually varied.

  The range runs from the lifelike to the purely functional. Hanako is a humanoid robot built specifically to train dental professionals, giving students a realistic practice patient. HRP-4C is a robot with the approximate figure of an average young Japanese female; it walks, talks, and, with the help of 30 motors, moves its arms and legs. Eight facial motors control its expressions, letting it smile, blink, pout, and register surprise or anger.

  Then there is Paro, a robot shaped like a baby seal, intended for therapeutic purposes. And AIBO, Sony's robotic dog, which can bark, wag its tail, and interact with children. PaPeRo and Musio sit in the social robot category alongside Paro and Wakamaru.

  On the mobility side, Waseda University and TMSUK jointly developed the WL-16RIII. Toyota produced both the i-foot and the i-REAL, machines designed for personal transport. Murata Manufacturing built two notable robots: Murata Boy, which rides a bicycle, and Murata Girl, which rides a unicycle.

  For rescue work, TMSUK built the T-53 Enryu. For domestic assistance, Toshiba developed AppriAttenda, a robot that fetches containers from a refrigerator using two arms and moves on wheels. Its stated purpose is to help elderly people living alone manage basic household tasks.

  Kirobo, Japan's first robot astronaut, arrived on the International Space Station on the 10th of August 2013.

• 4. The CB2 Experiment

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  One robot in Japan's catalog stands apart for what it reveals about the ambitions behind the research. CB2, short for child robot with biomimetic body, was built to learn rather than simply to execute.

  CB2 can follow moving objects with its eyes. Beneath its rubber skin, 197 film-like pressure sensors allow it to detect and process human touch. The team behind it, Asada, brought together engineers, brain specialists, and psychologists alongside technical specialists. Their goal was for CB2 to record emotional expressions, memorize them, and match them with physical sensations.

  The robot did not arrive with fixed abilities. It taught itself how to walk with the assistance of a human helper. To move around a room, it used 51 internal structures described as muscles, all driven by air pressure. The design principle was progressive: as the surrounding technology improved, so would CB2's capabilities.

  This philosophy of incremental, experience-driven learning set CB2 apart from robots programmed with fixed behaviors. The team was trying to model something closer to how a child develops, using the machine as a test of theories drawn from developmental science.

• 5. Industrial Scale

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  Approximately 700,000 industrial robots were in use worldwide in 1995. Of those, 500,000 operated in Japan. That concentration, three out of every four industrial robots on the planet inside a single country, tells you something about the depth of Japan's commitment to mechanized production.

  The commercial production of industrial robots in Japan began with Kawasaki Robotics, which started manufacturing them more than 40 years before the time the source material was compiled. The company's long-term financial resources and the strength of Japan's domestic market helped Japanese robotics firms capture a dominant share of the global industry.

  By 2012, between 1,235,000 and 1,500,000 industrial robots were in use worldwide. Japan remained home to many of the leading manufacturers: FANUC, Yaskawa Electric Corporation, Kawasaki, Denso Corporation, Mitsubishi Electric Automation, and others. The few non-Japanese firms that maintained significant market presence included ABB, a Swedish-Swiss company; the Austrian manufacturer igm Robotersysteme AG; and the German firm KUKA Robotics.

  Fumio Miyazaki, an engineering science professor at Osaka University's Toyonaka Campus, has stated that Japanese scientists could potentially provide thousands of humanoids working alongside humans by the end of the 2020s. Japan wants robotics in the 21st century to occupy the role that automobiles played in the 20th.

• 6. Robots and the Workforce

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  Japan's investment in robotics is not purely about manufacturing efficiency. The country faces a declining birth rate and a shrinking workforce, and robots are widely discussed as part of the national response to both pressures.

  Over a quarter of a million robots are currently employed in Japan's industrial sector, partly to reduce high labor costs and partly to accelerate mechanization. Estimates projected that number rising to over one million within the following 15 years from when those figures were published. The workforce implications of that shift are significant: a single robot can perform work that would otherwise require multiple human workers, and the jobs a robot can substitute for vary considerably by industry.

  The social weight of these changes is considerable. Japan's declining workforce is expected to strain future pension and healthcare programs. Robots are being positioned, in part, as a structural answer to those fiscal pressures.

  Researchers across Japan have publicly demonstrated robots intended for roles that were once entirely human: talking office receptionists, security guards, and even a primary school teacher. The domestic helper AppriAttenda was built with elderly people living alone specifically in mind. The framing is consistent across these projects: robots not as replacements for people in general, but as support for people in circumstances where human help is scarce or costly.

• 7. From Astro Boy Forward

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  Before Japan built humanoid robots in laboratories, it built them in the imagination. The cartoon character Astro Boy, known in Japan as Tetsuwan Atomu, was created by Osamu Tezuka and became one of the country's most beloved fictional robots. The character captured something that the engineers who followed him were also reaching for: a robot with human qualities, capable of feeling as well as acting.

  That cultural grounding is one way to understand why Japan's robotics programs have placed so much emphasis on social and emotional expressiveness, in robots designed to comfort hospital patients, teach children, or mirror human facial expressions. HRP-4C was programmed to walk a catwalk. Paro was shaped to be held. These are not industrial priorities; they reflect a set of values about what a robot should be capable of communicating.

  The karakuri tradition, which Hisashige Tanaka extended to its fullest Edo-period expression, already contained that instinct. The mechanical dolls were not tools. They were performers, built to delight and to surprise. The line from those wooden gears to the 197 pressure sensors under CB2's rubber skin is longer than a century, but it runs in a recognizable direction.