With recent advances in inkjet technology, many efforts are being made to achieve print quality comparable to a silver halide photograph. Technology for stable ejection of fine droplets is essential for this purpose. A novel droplet ejection system for the bubble jet, completely different from a conventional system and suitable for ejecting stable fine droplets, will be presented here. We have named the new system "MicroFine Droplet Technology". The new system advancements are : 1) Higher droplet ejection efficiency 2) Uniform droplet volume These are the key requirements to produce photo-quality images using fine droplets. In addition to the ejection system, a totally new manufacturing process that realizes the new bubble jet system will be presented. This manufacturing process is able to produce highly precise nozzles at lower cost and meet the demand for producing a high density multi-nozzle bubble jet head. We applied MicroFine Droplet Technology and new manufacturing process to our new bubble jet printhead on BJC-8500, introduced last March at the Seybold seminar. The new printhead has 1536 nozzles and BJC-8500 prints A3+ sized printouts in photographic quality twice as fast as a conventional inkjet printer.
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