While 3A Network is very strict about copyright, they have adapted to the digital age. You do not need to scan the book yourself. You can purchase official e-books.
“Take the first 13 lessons of Minna no Nihongo I anywhere. This PDF edition gives you the complete main textbook in a searchable, clickable, printable format – perfect for digital learners who still love the original structure.” minna no nihongo 1-1 pdf
The official Kindle versions are available on Amazon.co.jp (Japanese Amazon). You may need to change your device's region or use a VPN to purchase them, but once bought, you can download the .mobi or .epub file to your Kindle app. Note: Not all regions have access due to licensing. While 3A Network is very strict about copyright,