The enlargement book-reading vessel which makes the focus adjustment easy

摘要

(57) Abstract Topic Being the person who has fault in vision, easy?The enlargement which has the video camera where is securely the focus adjustment possibleOffer the book-reading vessel. Solutions Video camera 1 and video monitor 3 toolIn the enlargement book-reading vessel which preparation is done, in aforementioned video camera 1, shineDegree signal selection section 4, the differentiating circuit 5, it interposes joints the rectification circuit 6With ru, in aforementioned rectification circuit 6, from that circuit direct current voltage formingAmount branching, at the same time, the said voltage the acoustic frequency which is proportionate to thatTo joint the converting circuit 7 which is converted to the signal, in the said converting circuit 7 aThrough npu 8, by jointing supi - mosquito 9 focusTo form the adjustment circuit, focus adjustment virtue of aforementioned video camera 1When the work is done, the adjustment condition on the vibrating sound of supi - mosquito 9 dependingIt tried to be able to distinguish.