Earthed sockets are extremely rare. I have only seen them in private homes, in locations where large appliances are expected to be plugged in. Where available, earth is a separate wire that is screwed down onto a post. For example, here is a picture of the power cable for my Apple MacBook, purchased in Japan.
American three-pronged power plugs do NOT fit into Japanese sockets.
Type B plugs are very uncommon. Most Japanese appliances are built to be internally grounded ( not exactly sure how that works, but I believe they’re designed so that if they short out, they don’t electrocute you ).
However, have you considered looking for an unearthed AC adapter cord for your laptop? If it’s anything like the ones in North America, you can simply buy a new cord.
Type B plugs are not common, especially in “public” places such as hotels. (You are more likely to find them in a home or office.) Type B to A adapters can be easily obtained (but see the caveats in the comments).
Credit:stackoverflow.com‘
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