Optics: image projectors – Housing
Patent
1997-02-03
1998-09-15
Dowling, William
Optics: image projectors
Housing
353 57, G03B 2114
Patent
active
058069526
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a projection display apparatus for separating a white light beam from a light source into three colored light beams, specifically red, blue, and green, passing each of these colored light beams through a light valve composed of a liquid crystal panel for modulation according to the image information, and then after modulation recombining the modulated light beams of each color through a projection lens for projection enlargement to a screen. More specifically, the present invention relates to the arrangement of the components comprising such a projection display apparatus.
BACKGROUND OF THE INVENTION
A projection display apparatus basically comprises a light source lamp unit, an optical lens unit, a projection lens unit, a power supply unit, and a circuit board group on which the control circuitry, etc., is mounted. The white light beam emitted from the light source lamp unit is optically processed by the optical lens unit to synthesize a color image according to the image information. After processing, the combined light beam is projected by the projection lens unit onto a screen.
Except for the projection lens unit, each of these components is disposed within the apparatus' outside case. The projection lens unit is mounted with the front thereof projecting from the front of the apparatus. An operating panel with the power switch, etc., and a receptor window for the remote control, are disposed on the outer surface of the outside case.
If this type of projection display apparatus was made compact and lightweight to ease its transportation, it would be possible to view color images on a large screen in any desired location, which would be convenient.
However, the various units assembled inside a conventional projection display apparatus are arranged on the same horizontal plane. As a result, the length and width of the apparatus are large and it is therefore inconvenient to transport. When this projection display apparatus is placed on a table or desk, it occupies a large area, which is also inconvenient.
The likelihood of dropping the apparatus or colliding with walls, etc., is also increased when this projection display apparatus is transported. When the apparatus is impacted as a result of dropping or collision, the optical elements of the internal optical lens unit may become misaligned with each other, and the optical lens unit and light source lamp unit may become offset from each other. This may prevent appropriate color synthesis by the optical lens unit, resulting in color irregularites and lighting irregularites, and thus degraded projection image quality.
There are also projection display apparatuses including a drive unit for reading a floppy disk, PCMCIA card, or other recording medium, and constructed to form projection images corresponding to the read information. Appropriately positioning the drive unit in this type of projection display apparatus is important to reduce the size of the apparatus.
OBJECTS OF THE INVENTION
An object of the present invention is to reduce the length and width of the projection display apparatus by appropriately positioning within the outside case the various units comprising the projection display apparatus.
Another object of the present invention is to avoid deterioration of the projection image quality as a result of a misalignment occurring between the various units and between the optical elements in the units as a result of the projection display apparatus being impacted by dropping, collision, etc.
A further object of the present invention is to avoid increasing the size of a projection display apparatus by including a drive unit for reading a floppy disk, PCMCIA card, or other recording medium by appropriately positioning the drive unit.
SUMMARY OF THE INVENTION
To achieve the above objects in a projection display apparatus including: a light source lamp unit; an optical lens unit comprising a color separation means for separating the white light beam emitted from the light source lamp unit i
Dowling William
Seiko Epson Corporation
Watson Mark P.
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