Method and apparatus for forming color images using an image intensifier tube
Display systems Patent #: 4714320
ApplicationNo. 07/125486 filed on 11/25/1987
US Classes:359/630, Superimposing visual information on observer`s field of view (e.g., head-up arrangement, etc.)345/9, Plural image superposition359/634, Wavelength selective (e.g., dichroic mirror, etc.)359/833With reflecting surface
ExaminersPrimary: Corbin, John K.
Assistant: Ryan, Jay
Attorney, Agent or Firm
International ClassG02B 27/01 (20060101)
Foreign Application Priority Data1986-11-28 GB
AbstractAn optical projector (11) for a two-color head-up display wherein light of a first color from a first data source (15) passes through a first lens arrangement (23) into a first wedge-shaped body (27) wherein the light is, in turn, internally reflected at first and second angled faces (35 and 33) of the body and then exits the body at the first face (35) to pass via a second lens arrangement (25) to the system combiner (13) in a direction at an angle to that which light enters the body, and light of a second color from a second data source (37) passes through a third lens arrangement (41) into a second wedge-shaped body (43) wherein the light is reflected at one (49) of first and second angled faces (47, 49) of the second body and then exits the body at the other angled face (47), which is adjacent the second angled face of the first body, and then passes through the first body to the second lens arrangement, there being a dichroic coating at the interface of the two bodies to effect reflection of light of the first color but allow transmission of light of the second color, and the light paths for light for the two colors being of equal length. The arrangement of the projector facilitates the projector having lateral dimensions dictated by the data sources (e.g. CRTs) rather than the optical elements of the projector.