3/2/2024 0 Comments Overhead projector mirrorthe present invention seeks to solve the above-mentioned problems encountered in the conventional reflection type overhead projectors, and has for its object to provide a reflection type overhead projector which is very compact in the overall size, and which is not susceptible to misalignment of the optical axis.Furthermore, a large-sized transparency has another advantage, which cannot be otherwise obtained a particular point may be indicated on a viewing screen, by pointing a small stick to the corresponding location on the transparency. A large-sized transparency is subjected to correction or revision with little difficulty. While production of a small-sized transparency must be relied on (the photographic technology), a large-sized transparency can be produced by printing with ink, handwriting or other alternatives to photographic technology. the most valuable advantage of the projector of this type is in making it possible to employ a transparency of relatively large size.a transparency put on the Fresnel mirror is irradiated using a light source within a projector head attached to the upper end of the post, and the reflected light from the transparency is projected on a screen through a projecting lens within the projector head and a reflecting mirror.a post is erected at one upper corner of the body.the foregoing projector is so arranged that a Fresnel mirror is fitted to the upper surface of a unit body with the mirror surface thereof facing upwardly.a Fresnel mirror represents a Fresnel concave mirror.the term of a Fresnel concave mirror means a mirror which is formed in such a manner that a usual concave mirror is cut into separate concentric annular parts each having a fine width, and these annular parts are rearranged on the same plane, the mirror having a planar plate shape in the entire configuration but serving to function as a concave mirror. ![]()
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