OHP ORIGINAL SENSING SYSTEM, OHP ORIGINAL ELEMENT, IMAGE RECORDING FILM, AND ORIGINAL HOUSING MEMBER

摘要

PROBLEM TO BE SOLVED: To provide an OHP original sensing system which is used in combination with an OHP device and is hardly restricted in an original position to be placed on an original platen in order to allow a sensor to surely respond. SOLUTION: This OHP original sensing system is used in combination with the OHP device having the original platen 3 to be placed with an OHP original 9 having an image for projection and a projection section 5 for projecting the image for projection by receiving the light transmitted through the OHP original 9. (A) The OHP original 9 includes a sensor 7 for sensing whether the original exists in the original platen 3 or not and (B) an optical film for reflecting or absorbing the light signal to which the sensor 7 responds. The light signal is the light of a band exclusive of a visible light band. The optical film includes a wavelength selective transmitting film optically connected to the image for projection. The wavelength selective transmitting film allows the transmission of the light of the visible light band and absorbs or reflects the light signal.