Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2000-02-02
2001-07-17
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S689000, C345S905000, C312S223600
Reexamination Certificate
active
06262884
ABSTRACT:
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,768,095 to Fusanobu Nakamura disclosed a portable computer having overhead projection capability. However, such a portable computer is adapted for use with an overhead projector, namely, the computer being absolutely separated from an overhead projector and requiring an additional overhead projector when intended for overhead projection purpose. It therefore has the following disadvantages:
1. An additional stand (
20
) and strap (
40
) should be provided for mounting the LCD display panel on an overhead projector as fastened by the strap (
40
) especially as shown in
FIGS. 12A
,
12
B of the prior art (,095), causing inconvenience for overhead projection.
2. A heavy and big-volume overhead projector should be carried in addition to the portable computer, increasing handling complexity and inconvenience.
3. The detachment procedures for removing the rear cover (
51
) from the LCD display panel (
52
) secured on the lid (
50
) are quite complex and redundant when adapted for overhead projection use. Reversely, when it is intended for normal use as a portable computer, the “recovery” operations for re-assembling the rear cover (
51
) and the related components for “reconstruction” of the lid (
50
) are still complex and time-consuming.
The present inventor has found the drawbacks of the conventional art and invented the present portable computer having overhead projection device inherently carried thereon.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a portable computer including: a main body having keyboard formed thereon, a cover pivotally secured to the main body and operatively covering the main body, a liquid crystal display panel formed on the cover, a backlight cartridge having a backlight and a light diffusion plate normally positioned under the liquid crystal display panel for illuminating the liquid crystal display (LCD) panel for normally displaying the image on the LCD panel, a bottom projection cartridge alternatively substituting the backlight cartridge and positioned under the LCD panel when adapted for overhead projection purpose, a supporting device pivotally secured and normally folded on the cover (or on the main body) and operatively telescopically extended from the cover (or from the main body) to be uprightly erected on the cover (or the main body), and an overhead projection cartridge detachably mounted on the supporting device for projecting light towards the bottom projection cartridge, through which the light is then reflected and magnified upwardly through the LCD panel for projecting the image of the LCD panel upwardly to be magnified and reflected towards a screen through the overhead projection cartridge, thereby providing a compact combination of a portable computer with an overhead projection device for convenient handling and uses.
REFERENCES:
patent: 6049450 (2000-04-01), Cho et al.
patent: 6108195 (2000-08-01), Behl et al.
patent: 6191939 (2001-02-01), Burnett
Hwang Jim
Hwang Memiee
Hwang Richard
Hwang Wayne
Duong Hung Van
Picard Leo P.
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