An improved computer graphic work station is disclosed of the type that includes a digitizer for allowing an artist or other user to input a drawing into a computer, and an imaging device to produce an image of the drawing as it is being drawn. A beam splitter reflects at least a portion of the produced image to the eye of the user. The position and orientation of the beam splitter may be varied by a user relative to the imaging device in order to allow the user to align the workstation by causing the reflected image to appear, in the user's eye, to be substantially coincident with the drawing. Once aligned, the user may adjust the position and orientation of the digitizing surface without upsetting the alignment.
A collimating apparatus that reduces ghost images in the field of view of a main image generated. The collimating apparatus includes a meniscus lens having a reflective concave surface; a cholesteric liquid crystal (CLC), aligned on an axis common with the meniscus lens, disposed on the concave side of the meniscus lens, positioned to reflect light onto the concave surface and having a tilt making the normal of the CLC different from the normal of the meniscus lens; and an image source, disposed on the convex side of the meniscus lens and having a tilt corresponding to the tilt of the CLC. The tilted pair of the meniscus and image source direct any ghost images produced by light leaking through the CLC away from the line of sight of an observer of the main image.
In a projection exposure apparatus, two plane-parallel plates, which are equal in thickness and refractive index, are interposed between a projection optical system and a wafer. By tilting these two plane-parallel plates at the same angle in opposite directions with respect to the optical axis of the optical system by means of an adjusting device, astigmatism caused in the optical system by exposure is corrected. The amount of astigmatism is calculated by a calculating device based on the amount of light incident on the optical system per unit of time which is obtained according to the output of a light amount sensor.
An optical virtual touch pad system wherein reflective optics are used to superimpose a virtual image of a television screen display onto a touch-sensitive digitizing surface being operatively contacted by a user-controlled contact member. Alternatively, the system uses reflective optics to superimpose an uninverted virtual image of the digitizing surface and the contact member operating thereon onto the surface of the display. The system thereby, for example, can be used as a user interface to control interactive content on a home television.
A device enabling a user to reproduce an observed scene on a drawing board support including a first mirror; at least one second mirror, the mirrors being arranged to transmit an image from the support onto an eyepiece in front of which the user can position a first eye; and a secondary support capable of being intercalated between the scene and a second eye to be able to handle a close scene.
The invention relates to an adjustable table for an EDP system having a monitor (17) and a keyboard (18), the table having a telescoping column (14, 15) with at least one fixed part (14) and one movable part, a table top (11) on which a subpanel (12) is pivotal about an axis (22) parallel to a front edge of the table top, characterized in that the subpanel (12) is connected via a strut (13) with the fixed part (14) of the telescoping column (14, 15).
