Abstract: A child position monitoring system for providing a warning to a user that a child being monitored has or is moving. The child position monitoring system includes a motion detection assembly detects when the child rolls over, the motion detection assembly includes a transmitter assembly for sending a signal associated with motion detected; a coupling assembly is used for coupling the motion detection assembly to the child; and a monitoring assembly operationally interacting with the motion detection assembly and providing an indication associated with motion detected by the motion detection assembly to the user.

Abstract: A projection lens system which includes a telecentric lens assembly. The lens may be used to form an image from a light source, including for example a resonant microcavity phosphororcathode ray tube, onto a screen or display, such as in a television or a projection device. In accordance with one embodiment, a planar cooling gap or cavity (which may or may not contain a cooling liquid) is included between the imaging surface and the matching planar surface of the field lens. The use of a planar gap alleviates any temperature differentials across the cooling liquid and the lens surfaces, as compared with alternate designs that may have a non-planar gap between the faceplate and the field lens, or that use liquid lenses.

Abstract: A projection lens system which includes a telecentric lens assembly. The lens may be used to form an image from a light source, including for example a resonant microcavity phosphororcathode ray tube, onto a screen or display, such as in a television or a projection device. In accordance with one embodiment, a planar cooling gap or cavity (which may or may not contain a cooling liquid) is included between the imaging surface and the matching planar surface of the field lens. The use of a planar gap alleviates any temperature differentials across the cooling liquid and the lens surfaces, as compared with alternate designs that may have a non-planar gap between the faceplate and the field lens, or that use liquid lenses.

Abstract: A night vision device includes an image intensifier tube for providing an intensified image of a dim or night-time scene. The night vision device also includes provision for full duplex transmission and receipt of voice audio between the user of the device and another person who is using a substantially identical device. Another provision of the device is for interrogating IFF (identify friend or foe) units worn by other personnel. The IFF units have provision for receiving a beamed interrogation signal and for transmitting a coded identification signal in response. Thus, a user of the night vision device can identify friendly personnel at a distance, as well as communicating by voice with others who are using similar night vision devices so equipped.

Abstract: A day/night sight includes a visible-light first optical path and an invisible-light second optical path which are everywhere optically coaxial. The invisible-light second optical path leads to a detector or to an image intensifier tube for providing either an electrical signal or a visible image, respectively, in response to the invisible-light image. A third optical path for the visible image from the image intensifier tube is also everywhere optically coaxial with the first and second optical paths. A visible image produced from the electrical signal is introduced into the first optical path to thereafter be coaxial therewith. Consequently, a uniquely compact arrangement of the elements for the day/night sight is achieved.