The invention relates to a device for rendering visible acoustic vibrations, in which a fluid medium held on a foundation is caused to execute wave notions with the help of a movable wall or wall section, and in which the wave motions thus engendered are rendered optically visible.

An illumination device used for the direct illumination of light-sensitive ayers comprises a light source and a pattern generator. The pattern generator includes an optical Schlieren system and an active, matrix-addressable surface light generator. The Schlieren system comprises a Schlieren lens and a projection lens as well as a mirror device, which is arranged between these lenses and which directs light coming from the light source onto the surface of the surface light modulator. A filter device is used for filtering out diffracted light and for permitting undiffracted light to pass from the surface light modulator to the projection lens. The structure to be illuminated is secured in position on a displaceable positioning table. The surface light modulator is addressed such that the non-addressed surface areas thereof correspond to the projection areas of said structure which are to be illuminated.

An illumination device for producing models used for manufacturing electronic elements, or for direct illumination of wafers or substrates during the photolithographic steps required for their production, or for direct illumination of structures including light-sensitive layers, comprises a pulsed laser light source and a pattern generator. The pattern generator includes an optical Schlieren system and an active, matrix-addressable surface light modulator. The Schlieren system comprises a Schlieren lens arranged on a side of the surface light modulator, a projection lens facing away from the surface light modulator, and a mirror device which is arranged between the lenses for directing light coming from the light source onto the reflective surface on the surface light modulator. The Schlieren lens is arranged from the surface light modulator at a short distance relative to the focal length of the lens. A filter device is arranged in the diffraction image plane of the virtual point light source between the Schlieren lens and the projection lens, the filter device having a structural design of such a nature that it will either filter out the diffracted light reflected by the addressed surface areas of the surface light modulator or that it will filter out the undiffracted light. During the displacement of a positioning table, the model, the disk, the substrate or structure are composed of a plurality of partial images by adequate addressing of the surface light modulator.

A multi-media system, software and method for integrating music performance with visual effects. The method includes the step of storing a plurality of items each of which contains visual effect, allowing a first user to select at least one subset of the plurality of items and forming each of the at least one selected subset of the plurality of items into a file. The method also includes the steps of allowing a second user to select one of the files, allowing the second user to select one item in the selected file, and playing the selected item as the music performance is being played.

A musical instrument, having a monitor therein, contains a musical instrument body having a body cavity therein, and the monitor having a front face and a back, where the monitor fits within the body cavity of the musical instrument body. A screen cover is situated above the front face of the monitor and a cover plate positions the screen cover above the front face of the monitor, where the cover plate covers at least a portion of the screen cover. A bridge is located on a front face of the screen cover, where the bridge contains a pickup that does not use electromagnetic induction, and that senses vibrations of strings, suspended on said bridge, above the monitor, and translates the vibrations into audio signals.