Provided is an optical imaging pen configured to detect information encoded on a page with ink which is substantially invisible to the human eye. The pen includes a housing and an ink pen cartridge and a stylus mounted side by side within the housing, the ink cartridge and stylus configured to be brought forward through an open end of the housing by rotation of a pen top rotatably mounted on an end of the housing. The pen includes an electronics chassis mounted inside the housing, said chassis supporting an infrared LED for providing infrared radiation for projection onto the page, an image sensor for receiving reflected radiation from the surface, a radio frequency circuit having a radio frequency (RF) transmitter and receiver, and a controller circuit for controlling operation of the LED, sensor and radio frequency circuit. Also included is a rechargeable battery mounted about, and in contact with, the electronics chassis with an induction coil mounted about the chassis to enable induction recharging of the battery.