Optical: systems and elements – Glare or unwanted light reduction – Display window
Reexamination Certificate
2000-03-01
2001-06-26
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Glare or unwanted light reduction
Display window
C359S601000, C359S608000
Reexamination Certificate
active
06250765
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an antiglare sheet for use with a display of a portable game machine adapted to lessen susceptibility of a user of the machine to visual dysfunction or ophthalmic anomaly, such as asthenopia, through affixment to the display.
Generally, when a worker is engaged in a visual work involving prolonged use of the eyes, he or she tends to suffer asthenopia.
Causes of asthenopia are classified into five categories: accommodative, myopathic, syndromic, aniseikonic, and neurogenic. However, a visual display terminal (VDT), such as a personal computer or TV has become a cause of asthenopia which does not definitively belong to any of these five categories.
Visual work with a VDT is said to involve visual dysfunction, such as fatigue of the eyes, visual disorder, dimming of vision, or eye pain; or ophthalmic anomaly, such as asthenopia, myopia, keratoconjunctivitis, increased tension of the eye, or lacrimal disorder. These symptoms are generically called VDT ophthalmopathy.
In order to prevent VDT ophthalmopatby, there has been devised a framed or film-type filter to be attached or affixed to a display screen of a desktop personal computer or to that of a TV. Such a filter shuts off a certain percentage of visible light emitted from a display and prevents reflection of external light in the display screen, to thereby improve contrast of a displayed image. When a display is of a cathode-ray-tube type, the filter removes radiation and ultraviolet rays emitted from the display.
However, such a filter for use with a display of a portable game machine has not been devised. Since the portable game machine is used both indoors and outdoors, the number of types of external light forming an image on the display screen increase. Examples of such external light include indoor lighting or sunlight. Further, since the portable game machine is often used while its display faces upward, the frequency at which external light forms an image on the display screen increases further.
Since a user plays a game with concentration while staring at the display screen of the portable game machine, reflection of an external-light source in the screen affects the eyes of, particularly, a preschooler or an elementary school student, who is in an important stage of physical development. Such an adverse effect on the eyes of children may cause an irreparable affection of their eyes. This is considered to be a kind of disease resulting from civilization, and has become a worldwide issue in relation to health of eyes.
The above problem may be solved through attachment of a frame-shaped filter to the display of a portable game machine or through bonding of a film-shaped filter to the display. However, attachment of a frame-shaped filter to the display impairs portability due to projection from the display. Further, in the case of a conventional film-shaped filter, since adhesive is applied to the entire surface of the filter, the filter is difficult to affix to the display screen through a manual operation. Also, the affixment involves entry of bubbles between the film and the screen, impairing visibility of the screen. Further, entrapped bubbles swell and expand with ambient temperature.
When an affixed film-type filter is removed from the display screen for replacement, the display screen is smeared with residual adhesive, impairing the function of a replacing filter. A similar problem arises when the same film-type filter is re-affixed; for example, after failure in an initial attempt at affixment.
In order to avoid the above problem, in manufacture of a display of a desktop apparatus, a film-type filter is mechanically affixed to the screen of the display for permanent affixment, thereby preventing entry of bubbles between the filter and the screen. However, when the filter is to be replaced due to deterioration, such as scratches, smudges of fingerprints, or discoloration caused by long-term use, the display itself must be sent to a repair shop. In the worst case, the display must be replaced.
SUMMARY OF THE INVENTION
The present invention has been accomplished in view of the above mentioned problems.
A first object of the present invention is to provide an antiglare sheet for use with a display of a portable game machine.
A second object of the present invention is to provide an antiglare sheet for use with a display of a portable game machine, capable of being easily replaced.
A third object of the present invention is to provide an antiglare sheet for use with a display of a portable game machine, which does not smudge the entire screen of the display during affixment or replacement thereof.
A fourth object of the present invention is to provide an antiglare sheet for use with a display of a portable game machine, being free of a functional change even at increased temperature, as is encountered during the summertime.
Other objects of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings.
To achieve the above objects, the present invention provides an antiglare sheet for use with a display of a portable game machine, comprising: a film element serving as an antiglare film; an adhesive element adapted to affix a circumferential portion of the back side of the film element to a portion of the display located within or outside the circumference of a display screen; and a ventilation opening adapted to ventilate a space defined by the display screen and the film element.
Specifically, the present invention provides an antiglare sheet for use with a display of a portable game machine, which antiglare sheet is adapted to irregularly reflect external light impinging on a display screen and comprises a film element adapted to irregularly reflect incident external light; and an adhesive element adapted to affix a circumferential portion of a back side of the film element to a portion of the display located within or outside the circumference of the display screen.
Preferably, the film element comprises a film base layer serving as a base of the film element; and an antiglare (AG) coat layer disposed on the film base and having a rough surface so as to irregularly reflect incident external light.
Preferably, the film element has a structure for attenuating light emitted from the display.
Preferably, the film element is completely transparent or is tinted so as to be transparent in a tinted manner.
Preferably, material for the film base layer is a transparent synthetic resin which contains polyethylene terephthalate (PET) resin, and material for the AG coat layer is a transparent synthetic resin which contains acrylic resin.
Preferably, the adhesive element comprises an adhesive base layer serving as a base of the adhesive element; an adhesion-to-film layer adapted to establish strong adhesion between the film element and one side of the adhesive base layer; and an adhesion-to-display layer adapted to establish weak adhesion between the display screen and the other side of the adhesive base layer.
Preferably, the adhesive element is transparent.
Preferably, material for the adhesive base layer is a synthetic resin which contains PET resin; material for the adhesion-to-film layer is a synthetic resin strong-adhesive which contains an acrylic strong-adhesive; and material for the adhesion-to-display layer is a synthetic resin weak-adhesive which contains an acrylic weak-adhesive.
Preferably, the adhesive element comprises a ventilation opening adapted to establish communication between the interior and exterior of a space defined by the display screen and the film element and assumes a discontinuous frame-shape.
By virtue of the above-described features, the antiglare sheet of the present invention prevents external light to form images on the display screen, to thereby bring about an increase in the blinking frequency of a user who plays a game on the portable game machine while staring at the display, thereby lessening susceptibility of the user to visual dysfunction
Abe Seisakusho Company, Limited
Jordan & Hamburg LLP
Nguyen Thong
LandOfFree
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