Abstract: A raised pavement marker includes a reflector assembly that is resiliently supported by a membrane, that in turn is supported by a frame. The reflector assembly includes a skirt that overlaps the membrane, thereby allowing large-area reflectors and low-angle ramp surfaces. A vent is formed between the skirt and the membrane, and this vent is resistant to clogging. Locating elements are placed on the frame of the pavement marker to assist in proper installation of the marker in a recess of a roadway, such that all portions of the frame are positioned below the surface of the roadway. Indentations allow the installer to gauge the level of adhesive in the recess.

Abstract: An information recording medium includes a substrate having first and second sides. A layer of photoresist is deposited on the first side of the substrate. This layer of photoresist has a selected thickness and defines an area of openings therein such that the first side of the substrate is exposed at the openings, the openings being distributed in a pattern indicative of selected stored information. A reflecting layer is deposited on the photoresist layer and on the first side of the substrate at the openings. Both the substrate and the layer of photoresist are adapted to transmit the reading beam such that a portion of the reading beam incident on the second side of the substrate is reflected out of the substrate by the reflecting layer, both in a first region comprising the openings and in a second region between the openings.

Abstract: A keyboard entry system is disclosed which comprises a keyboard which includes a plurality of letter keys, one for each letter of a selected language. The entry system responds to conventional sequential activation of individual keys by providing output signals indicative of the respective individual letters associated with the activated keys to an application program such as a word processor or printer control program. The keyboard entry system also responds to chords of simultaneously activated multiple keys by using these chords to retrieve stored words from a dictionary. It is the stored words rather than the entered chords which are applied as inputs to the application program. This system allows an operator to use both conventional sequential key entry techniques and chorded entry techniques for rapid data entry. Chords are detected by comparing a stored constant with the elapsed time between a key release and the immediately preceding key depression of an overlapping key.

Abstract: A keyboard entry system is disclosed which comprises a keyboard which includes a plurality of letter keys, one for each letter of a selected language. The entry system responds to conventional sequential activation of individual keys by providing output signals indicative of the respective individual letters associated with the activated keys to an application program such as a word processor or printer control program. The keyboard entry system also responds to chords of simultaneously activated multiple keys by using these chords to retrieve stored words from a dictionary. It is the stored words rather than the entered chords which are applied as inputs to the application program. This system allows an operator to use both conventional sequential key entry techniques and chorded entry techniques for rapid data entry.

Abstract: An information recording medium includes a substrate having first and second sides. A layer of photoresist is deposited on the first side of the substrate. This layer of photoresist has a selected thickness and defines an area of openings therein such that the first side of the substrate is exposed at the openings, the openings being distributed in a pattern indicative of selected stored information. A reflecting layer is deposited on the photoresist layer and on the first side of the substrate at the openings. Both the substrate and the layer of photoresist are adapted to transmit the reading beam such that a portion of the reading beam incident on the second side of the substrate is reflected out of the substrate by the reflecting layer, both in a first region comprising the openings and in a second region between the openings.

Abstract: A process for making a radiation-reflecting record carrier, such as a video disc, is provided on which video and/or audio information is stored in an optically readable track in which first reflective areas alternate with second reflective areas, the two reflective areas having different effects on a reading beam in a playback machine so that the information recorded on the carrier may be recovered. The second reflective areas serve to direct the reading beam away from the path along which it is reflected by the first reflective areas. The process uses photographic techniques to form a master negative or positive, and to form record carrier replicas from the master.In the disclosed embodiment of the method and apparatus of this invention, the second reflective areas of replica carrier are formed by raised crystalline deposits of a material such as silicon which are chemically deposited in a selected, optically generated pattern on the replica carrier.

Abstract: A process for making a radiation-reflecting record carrier, such as a video disc, is provided on which video and/or audio information is stored in an optically readable track in which reflective areas alternate with non-reflective areas, the two areas having different effects on a reading beam in a playback machine so that the information recorded on the carrier may be recovered. The non-reflective areas are formed as apertures in the reflective areas and the underlying substrate is preferably translucent. The disclosed process uses photographic techniques to form a master negative or positive, and to form record carrier replicas from the master.In one disclosed embodiment of the method and apparatus of this invention, a two-sided recording medium comprises two transparent substrates, each of which supports a perforated metallic, reflecting layer. The two substrates are held together by a layer of adhesive disposed between the two reflecting layers.