Abstract: A miniature visual display has an optical lens system with at least two separated lens elements positioned to admit a scanning mirror between them. The scanning mirror is driven with an oscillatory motion causing an image of a light source which is reflected in the mirror to appear to sweep across the field of view of an observer looking into the system. The light source is typically a linear array of light-emitting diodes, and the diodes are controlled to emit light flashes in synchronism with the scanning mirror oscillation frequency to generate a virtual raster image. The two lens elements are selected and arranged so that the magnification power of the system is split between the lenses. A viewer looking into the system sees a virtual image apparently positioned at a comfortable viewing distance which is in uniform focus over the entire viewing area.

Abstract: A miniature, full-color display includes two rows of light-emitting elements that are both selected to emit light in substantially non-overlapping wavelength ranges comprising a blue-green wavelength range and a red wavelength range. The light-emitting elements as well as a magnifying lens, and an oscillating mirror are placed in a light-tight box having an opening through which the mirror may be viewed. The light from the blue-green elements is filtered by a filter which transmits either blue or green light depending on the mirror movement. The light-emitting devices are selectively illuminated as the mirror moves to create a full-color, substantially planar, two-dimensional image. The light box may be sized to be hand-held, or may be capable of being mounted to a pair of glasses, a headband or similar device.

Abstract: Apparatus and a method are disclosed for reducing the transmission power required when a host computer displays video information on a remote video display. A video memory is located in close proximity to the display so that the display can be periodically refreshed in the normal manner from the local memory. Consequently, the host computer need only transmit information regarding the portions of the local memory that have changed since the last data transmission. Since the information for the entire local memory is not transmitted each time the memory must be updated and in particular, each time the display must be refreshed, the required data transmission rate between the host and the display is greatly reduced from the rate normally required with prior art apparatus and, consequently, the power consumption is reduced.

Abstract: A telephone handset incorporates a miniature virtual image display which can display a full page of text at high resolution. The miniature display is a scanning mirror type of display in which a line image is generated by a line of light-emitting devices such as light emitting diodes (LEDs). A magnifying optical system creates a magnified virtual image of the LED line and the virtual line image is then converted into a virtual raster image by an oscillating mirror. The virtual image can be viewed at distances close to the display so that the display can be viewed while the telephone handset is being used.

Abstract: A pocket-sized data receiver which is capable of displaying a full, 80 column page of data includes a virtual raster display unit, and electronic circuitry for receiving data by means of radio transmission or conventional telephone lines, processing the data into a viewable format, storing the data, displaying the data on the raster display unit, and in the case of reception of data over telephone lines, retransmitting of the data to another device over telephone lines. A keyboard connectd to a processing unit enables the viewer to enter dialing information, select data for viewing, and control the selection and operation of the data receiver. The data receiver can be held and operated with one hand, and requires only one eye for viewing, thereby leaving the other eye unobstructed.

Abstract: A resonant scanning unit utilizes a "tuning fork" design with a mirror mounted on one arm of the tuning fork and a counterbalance mass mounted on the other arm. A voice coil electromagnetic motor mounted between the arms causes the arms to move in opposite directions. Light generated by a line of LEDs is reflected from the oscillating mirror to generate a raster display. Reaction forces generated by the motions of the mirror and counterbalance mass cancel at the device base, reducing vibration. In addition, the inventive structure allows placement of the mirror pivot point away from the center of the mirror which allows display devices constructed with the structure to be reduced in size. A second embodiment is disclosed in which molded construction reduces assembly cost and time and allows precise tuning of the reaction forces.

Abstract: A head mounted display for presentation of video information includes a virtual raster display unit, an attachment mechanism for attaching the display unit to the head of the user, a support member connected to the attachment mechanism for supporting the display unit within the user's field of vision, and a remote signal source for providing power, timing, control signals and display information to the display system. The head attachment mechanism can be symmetrically designed to allow positioning of the display unit in front of either of the viewer's eyes, or the attachment mechanism may be eliminated completely and the support member and display unit attached directly to a conventional helmet or the user's eyeglasses.

Abstract: A miniature full-page video display which mounts at least one row of light-emitting elements such as LEDs, a magnifying lens, and a vibrating mirror in a light-tight box having an opening through which the mirror may be viewed. The LEDs are selectively illuminated at points in the travel of the vibrating mirror, resulting in rows of pixels being projected at selected points on the mirror to provide a two-dimensional image. Two or more rows of light-emitting diodes, each of a different color, may be adjacently mounted and selectively illuminated in a manner such that corresponding LEDs are projected on the same spot on the mirror, resulting in a color image. The light box may be a hand-held device or it may be mounted to glasses, a headband or a similar device, and the virtual image appearing at the mirror may be viewed directly through an opening in the box or through a suitable optical system.

Abstract: A resonant scanning unit utilizes a "tuning fork" design with a mirror mounted on one arm of the tuning fork and a counterbalance mass mounted on the other arm. A voice coil electromagnetic motor mounted between the arms causes the arms to move in opposite directions. Light generated by a line of LEDs is reflected from the oscillating mirror to generate a raster display. Reaction forces generated by the motions of the mirror and counterbalance mass cancel each other at the device base, reducing vibration. In addition, the inventive structure allows placement of the mirror pivot point away from the center of the mirror which allows display devices constructed with the structure to be reduced in size.

Abstract: A water pump used in a cooling system for an internal combustion engine includes a pump shaft fixedly connected to an impeller means and detachably connected to a driven gear. The driven gear is in meshing engagement with a drive gear which is detachably mounted on a cam shaft rotated by the engine. The two shafts are not axially aligned, but are arranged in parallel relationship with each other. Thus, the optimum rotational ratio between the shafts may be obtained by adjusting the radii of the gears.