Abstract: According to a system for providing event information of the present invention, a content provider photographs and records the lecture content and the like of lecture meetings on the basis of requests from users or its own judgment and posts the subjects, lecturers, date and hour of the obtained lecture meetings on its own home page over the Internet. When the user selects a lecture meeting the user wants and registers the user's mail address or the like, the user receives the delivery of photographed content and materials of lecture content and the like of the lecture meeting from the content provider. At that time, an advertisement is simultaneously delivered from an advertising server which the content provider individually contracts with, so that the user's monetary burden can be lightened.

Abstract: An optical element positioning device comprises a fixed member fixed to an optical apparatus having an optical axis, a movable member supported by the optical apparatus so as to be movable with respect to the fixed member, and holding a plurality of optical elements along the moving direction, a first permanent magnet arranged in the fixed member, and a plurality of second permanent magnets equal in number of the optical elements, disposed in the movable member along the moving direction and selectively able to face the first permanent magnet when the movable member is moved.

Abstract: A microscope apparatus manufacturable at a low cost, and equipped with a photographing device assuring coincidence between an image to be observed and an image to be photographed, correctly photographing the up-down and right-left directions of a sample with no switching operation and permitting correct readout of characters, etc. written on a sample, a macro observation or drawing attachment permitting observation of the entire surface of a sample even of a large size without fail, not degrading operability of the microscope and having a composition to facilitate correction of image rotation, and a data imprinting device providing legible imprinted data images and capable of shifting data imprinting position on the film surface of the photographing device.