Well, if the Chinese characters you refer to are these two Chinese characters circled out in the red color in the following picture, then the reason why they appear on that box is that 尼康, which is pronounced in Pinyin as ní kāng, is the official Chinese name of Nikon.
And the Chinese character 尼 could mean peaceful. The Chinese character 康 could mean abundant. So, as you see, 尼康 is a great and suitable Chinese name for Nikon. And in the Chinese consumer market, this Japanese brand is more known as 尼康.