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| Optical system |
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Stereoscopic projector
| Details |
Inventors: Lee, Dong H.;
Assignee: Goldstar Co., Ltd. (Seoul, KR)
Primary Examiner: Cuchlinski, Jr.; William A.
Assistant Examiner: Dowling; William C.
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch
A stereoscopic projector includes a condenser member for leading a beam from a lamp to advance in parallel, an infrared ray filter for removing heat component in the beam from the condenser system, a polarizing beam splitter for splitting an incident beam into two beams, a liquid crystal display panel or a slide film for obtaining image signals, and a reflective mirror for converting the beam path a field lens and a projection lens, whereby the projector prevents the keystoning phenomenon, since the light utilizing efficiency is high, the power loss is reduced, and the infrared filter removes the thermal line from the beam so that the separate cooling system is not required. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a stereoscopic projector for overcoming such problems encountered in the conventional projectors.
Another object of the present invention is to provide a stereoscopic projector which comprises a condenser member for inducing a beam emitted from a lamp to advance in parallel, an infrared ray cut filter for removing heat component in the beam emitted from the condenser member, a polarizing beam splitter for splitting an incident beam into two polarizing beams of which the polarizing directions are different from each other, an LCD panel or a slide film for obtaining image signals, a reflective mirror for converting the beam path, a field lens, and a projection lens.
A further object of the present invention is to provide a stereoscopic projector having a condenser member which comprises a lamp, a non-spherical reflective mirror or a paraboloidal mirror mounted at the rear side of the lamp for inducing the beam directed backward among the beams emitted from the lamp to advance forward, a beam guide unit for inducing the beam directed forward to advance in parallel, and a reflective mirror member including one or more ringular band-type spherical mirrors.
Also the projector has a polarizing beam splitter which comprises two sheets of triangular prisms attached to each other at the slant surfaces thereof and a coating layer for splitting the incident beam into beams having the polarizing directions which are perpendicular to each other.
Still another object of the present invention is to provide an improved projector for obtaining stereoscopic pictures and dissimilar to the conventional system using two projections so that the keystoning phenomenon does not occur and since the majority of the beam from a light source is utilized, the loss of power can be reduced.
In addition, the projector of the present invention is simple in construction and inexpensive to manufacture, and easy in use, whereas the conventional system requires a complicated projection lens driving system to make the pictures projected on the screen from two projectors accord to each other
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