* Amazon unveils AI-infused Alexa+ and new devices * Ring, Blink get high-end cameras for security * Fire TVs get update, higher resolution screens (Adds more details on the Amazon devices event in paragraphs 9-12 through 12) By Greg Bensinger and Arriana McLymore SAN FRANCISCO, Sept 30 (Reuters) – Amazon on Tuesday unveiled a refreshed lineup of devices optimized for home security and its new artificial intelligence-infused Alexa+ voice assistant. At an event in New York, Amazon showed off Echo speakers, Fire TV streaming devices, a new Kindle reader and improved Ring and Blink cameras, which will be available later this year. Amazon is trying to drive interest in the new Alexa, after investing billions of dollars and years updating it with AI for better personalization and a more convers

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