Imagineer Co., Ltd. (イマジニア株式会社 Imajinia Kabushigaisha) is a Japanese entertainment company headquartered in Nishi-Shinjuku, Tokyo, Japan.
The name "Imagineer" is a portmanteau, derived from the words "imagination" and "engineer". They started publishing video games in the mid-1980s. In the late 90's the company published a few games for the PlayStation and Sega Saturn under the name Imadio.
The computer game software production and publishing has been once the heart of their business, however, nowadays they are more focused on the Japanese phone business.
Source: Wikipedia, "Imagineer (Japanese company)", available under the CC-BY-SA License.