Television – Video display – Cathode-ray tube
Patent
1994-08-17
1996-07-09
Coles, Sr., Edward L.
Television
Video display
Cathode-ray tube
348781, 348789, 348383, 359611, 359802, 359457, H04N 574, H04N 572, G02B 2100, G02B 2702
Patent
active
055349510
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a television image processing device for use in front of a television screen to enhance the enjoyment of television watching.
SUMMARY OF THE INVENTION
According to the invention, there is provided a television image processing device for use in front of television screen having a diagonal dimension of S, which imaging processing device comprises four panels connected together to form a hollow body having a substantially rectangular open front side of width W and height H and a substantially rectangular open rear side of width W' and height H', the separation between the front and rear open sides being and the inner sides of the panels being reflective which image processing device further comprises front and lenses provided extending across the open front and rear sides, respectively, of the body the front side of the rear lens being reflective, wherein the dimensions are related according to the following formulae:
It is preferred that the front lens is a Fresnel lens.
Preferably, the front lens is curved.
In a preferred embodiment, the rear lens is planar.
In a specific construction, the dimensions of the rear side of the body are substantially equal to that of a said television screen.
The invention also provides a television set which incorporates such a television image processing device.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a front perspective view of an embodiment of a television image processing device in accordance with the invention;
FIG. 2 is a sectional side view of the image processing device of FIG. 1;
FIG. 3 is a sectional plan view of the image processing device of FIG. 2; and
FIG. 4 is a front perspective view of a television set for use with the image processing device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, there is shown a television image processing device 10 embodying the invention. The image processing device 10 comprises a hollow body 11 which is formed by four panels connected together, namely top panel 12, bottom panel 13 and two side panels 14 and 15, each having the shape of a symmetrical trapezium. The body 11 has a rectangular open front side 16 and a relatively smaller rectangular open rear side 17.
Extending across the open front end 16 of the body 11, there is provided a front lens 18 which is curved, being convex on the front side and concave on the rear side. The front lens 18 is preferably a Fresnel lens. A Fresnel lens is a generally known form of lens which has a surface comprising a plurality of smaller lenses or is constructed with stepped setbacks, usually but not necessarily circular. The open rear side 17 of the body 11 is occupied by a rear lens 19, extending there-across. The rear lens 19 is planar and has a reflective front side, but may be a curved lens.
The image processing device 10 is to be used in front of the screen 31 of a television set 30. The television screen is generally rectangular and has a diagonal (corner-to-corner) dimension of S (See FIG. 4). The front side 16 of the body 11 of the image processing device 10 has a width of W and a height of H, whereas the rear side 17 has a width of W' and a height H'. The separation between the front and rear sides 16 and 17 of the body 11 has a measurement of D, that being the depth of the body 11.
The various dimensions or measurements are related according to the following formulae: (.sqroot.5-1)/2 or about 0.618, and K denotes a constant having a value in the range between 0.1 and 0.2.
In this particular embodiment, the width W' and height H' of the rear side 17 of the body 11 of the image processing device 10 are chosen to be the same as the corresponding measurement of the television screen. As a result, the remaining dimensions of the body 11, namely the values of W, H and D, can be determined according to the above three formulae. It is, however, to be understoo
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Chung Kin Lo
Coles Sr. Edward L.
Williams Kimberly A.
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