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Here is my DIY scanner effort from about 8 years ago. Made from scrap wood. I've used many different lights and cameras over the years. This current arrangement shows an LED floodlight and an ancient video camera (materials on hand...) and it does a great job. Obviously I use the video camera in single frame mode! The center "V" tray has two pieces of glass (from dollar store picture frames) to keep the pages flat, and that is really important for OCR.
The reason for the floodlight: with cheap old cameras I found lots of light (~high f-stop) improves depth of field and focus.
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