Optical: systems and elements – Projection screen
Reexamination Certificate
1998-07-27
2001-05-15
Metjahic, Safet (Department: 2858)
Optical: systems and elements
Projection screen
Reexamination Certificate
active
06233095
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a screen member for a reflex type screen that is simple in structure and superior in optical characteristics.
FIG. 3
shows a conventional screen member for a reflex type screen. A reflex film
21
is bonded by adhesives on a surface made of PET film (polyethylene telephthalate resin film) which serves as a base
20
of the screen. A deflection film
22
made of PETPF film (polyethylene telephthalate resin film system deflection film, more specifically, polyester system deflection plate made by mono-axis drawing and adding two-color dye to polyester resin) is bonded onto a surface of the reflex film
21
by adhesives. An OPP film (bi-axial drawn polypropylene film) is bonded by adhesives on a surface of the deflection film
22
as a random reflective film
23
for reflecting, at random, the reflex beam of light from the reflex film
21
and an incident beam of light from a projecting means such as a projector.
However, in the prior art, a large number (four) of films must be bonded by adhesives to each other. In the case where a large screen such as an 80-inch screen is to be manufactured, it is very troublesome or difficult to bond the films without creases or non-uniformity.
In addition, in the prior art, the surface of the random reflective film
23
, which is the frontmost surface layer of the screen member, is formed in a corrugated manner, and the incident ray of light from the projector and the reflective ray of light from the reflex film
21
is reflected randomly so that an image projected on the screen may be observed even in a direction oblique to the screen. However, if the large size screen is designed with such an arrangement, a degree of the random reflection is too small and the image becomes dark if it is viewed in the oblique direction relative to the screen. Thus, image projected on the screen is hardly observed.
Also, the conventional system suffers from the following disadvantages. Namely, the OPP film (random reflective film
23
) is a bi-axial drawn film. An axial displacement of the crystal axis is likely to occur in a width direction. The displacement between a transparent axis and the deflection film
22
used in the screen is in the width direction so that particularly, the image at the right and left end portions is likely to be dark.
SUMMARY OF THE INVENTION
Accordingly in order to overcome the above-described disadvantages, an object of the present invention is to provide a screen member for a reflex type screen with a practical advantage which is simple in structure in which an image projected on the screen may be easily observed even if the image projected on the screen is observed in an oblique direction.
According to the present invention, there is provided a screen member for a reflex type screen for reflecting a ray of projected light from a projecting means such as a projector, comprising a first portion formed integrally with an inner reflex layer on a surface of a base and a second portion formed of a deflection film is bonded to a surface of the first portion.
The surface of the inner reflex layer is formed into a corrugated surface.
An acrylic spherical beads or scale piece-like pearl pigment is mixed into the inner reflex layer.
A minimum thickness of the inner reflex layer is set in the range of 2 to 10 &mgr;m.
A metal portion is formed on the surface of the inner reflex layer.
The second layer is formed of an outer reflex layer integrally formed with a surface of the deflection film.
The surface of the outer reflex layer is formed into a corrugated surface.
Acrylic spherical beads or pearl pigment is mixed into the outer reflex layer.
A minimum thickness of the outer reflex layer is set in the range of 2 to 4 &mgr;m.
According to another aspect of the invention, there is provided a screen member for a reflex type screen for reflecting a ray of projected light from a projecting means such as a projector, comprising a first layer formed integrally with an inner reflex layer on a surface of a base, a second portion formed of a deflection film integrally with an outer reflex portion on a surface of the deflection film bonded to a surface of the first portion; a minimum thickness of the inner reflex layer is set in the range of 2 to 10 &mgr;m, acrylic spherical beads or a scale piece-like pearl pigment is mixed into the inner reflex layer, the surface of the inner reflex layer is formed into a corrugated surface; and a metal layer is formed on the surface of the inner reflex layer, a minimum thickness of the outer reflex layer is set in the range of 2 to 4 &mgr;m, acrylic spherical beads or a pearl pigment is mixed into the outer reflex layer, and the surface of the outer reflex layer is formed into a corrugated surface.
According to still another aspect of the invention, there is provided a screen member for a reflex type screen for reflecting a ray of projected light from a projecting means such as a projector, comprising a first portion formed integrally with an inner reflex layer on a surface of a polyethylene telephthalate film, and a second portion formed of a polyester system deflection plate integrally with an outer reflex layer on the surface of the polyester system deflection plate bonded to a surface of the first portion; wherein a minimum thickness of the inner reflex layer is set in the range of 2 to 10 &mgr;m, acrylic spherical beads having a particle size of 2 to 15 &mgr;m or a scale piece-like pearl pigment having a particle size of 50 to 70 &mgr;m is mixed into the inner reflex layer, the surface of the inner reflex layer is formed into and a corrugated surface; wherein a metal layer is formed on the surface of the inner reflex layer, a minimum thickness of the outer reflex layer is set in the range of 2 to 4 &mgr;m, acrylic spherical beads having a particle size of 2 to 15 &mgr;m or a pearl pigment having a particle size of 50 to 70 &mgr;m is mixed into the outer reflex layer, and the surface of the outer reflex layer is formed into a corrugated surface.
Since the screen member is composed of the first portion and the second portion which are bonded together, it is easy to be manufactured.
Since the inner reflex layer is provided on the base, there is no crease or localization of the first portion.
Since the outer reflex layer is bonded to the deflection film, there is no crease or localization of the second portion.
Since the amount of the adhesive layer is small, even if the adhesive is used for bonding the first and second portions together, the transparency of the light is improved, and the incident light may be well reflected by the inner reflex layer.
Also, since the OPP film is not used, the displacement of the axis in the transverse direction is suppressed and a uniform image having a high brightness without any non-uniformity may be seen.
Incidentally, the surfaces of the inner and outer reflex layers are corrugated so that the random reflectivity of the reflected light to the screen member is enhanced. Even if the screen may be viewed obliquely, the image projected on the screen may be seen.
With such a structure, according to the present invention, it is possible to provide a screen member for a reflex type screen which is simple in structure in which an image projected on the screen may be easily observed with practical and productive advantages, even if the image projected on the screen is observed in an oblique direction.
REFERENCES:
patent: Re. 30892 (1982-03-01), Bingham et al.
patent: 2407680 (1946-09-01), Palmquist et al.
patent: 3994086 (1976-11-01), Mizuochi
patent: 4104102 (1978-08-01), Eagon et al.
patent: 5706134 (1998-01-01), Konno et al.
patent: 0 291 178 (1988-01-01), None
patent: 4-321017 (1992-11-01), None
Kishimoto Masaaki
Maruta Hajime
Nakamura Koji
Niwa Masatoshi
Wada Koichi
Arisawa Mfg. Co., Ltd.
LeRoux Etienne
Metjahic Safet
Sughrue Mion Zinn Macpeak & Seas, PLLC
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