Patent EP0514045B1 successfully refreshed from Google Patents.
EP0514045B1
Expired / Lapsed
EP
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Rear projection facetted screen
Assignee: Raytheon Co
•
Filing: 1992-04-30
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Granted: 1998-03-04
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Expires: 2012-04-30
Abstract
No abstract record available.
Inventors
- 👤 Jerry M. Loban
- 👤 Kenneth R. Brooke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:00
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/301; G09B9/302; G09B9/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
170 words
A projection screen structure (10) for an image projection system (22), said
structure comprising: a translucent screen assembly (11) having front and
rear surfaces; said screen assembly comprising a plurality of
interconnected screen panels (12,16,18,20) each including
flange portions which protrude outwardly from
the rear surface of said screen assembly along mating
portions of said screen panels (12,16,18,20); and means for joining said screen panels
(12,16,18,20) including clamping means (42,44,46) for
holding together said flange portions of
adjacent screen panels (12,16,18,20); said clamping means (42,44,46) comprising: two elongate members (42,44) disposed on opposite
sides of said flange portions of said adjacent
screen panels (12,16,18,20); and fastening means (46) for holding said two
elongate members (42,44) together with said
flange portions sandwiched between them; each elongate member (42,44) having a reduced
thickness portion (52) near the base of said flanges; characterised in that: said screen assembly is concave on said front surface, said flange portions are overlapping; and said reduced thickness portions (52) of said elongate members (42,44) are
substantially transparent.
Claim 2
Dependent Claim
26 words
A structure as claimed in claim 1, in the form of a
dome (10), the shape of said screen assembly approximating
a portion of a sphere.
Claim 3
Dependent Claim
27 words
A structure as claimed in claim 1 or claim 2,
further comprising a screen support frame (14,50) having
elongate frame members disposed above said clamping means
(42,44,46).
Claim 4
Dependent Claim
32 words
A structure as claimed in claim 3, further
comprising a spring (48) having one end attached to said
clamping means (42,44,46) and the other end attached to said
screen support frame (14,50).
Claim 5
Dependent Claim
25 words
A structure as claimed in any preceding claim, wherein said two
elongate members (42,44) are opaque except for said
substantially transparent reduced thickness portions (52).
Claim 6
Dependent Claim
15 words
A structure as claimed in any preceding claim,
wherein said screen panels (12,16,18,20) are flat.
Claim 7
Dependent Claim
41 words
A structure as claimed in any preceding claim,
wherein each screen panel (12,16,18,20) is disposed such
that lines (34) projecting orthogonally from the center of
the front surface of each panel (12,16,18,20) will all
intersect at approximately the same point (36).
Claim 8
Dependent Claim
82 words
A structure as claimed in any preceding claim,
wherein said screen assembly includes at least eleven
interconnected screen panels (12,16,18,20) including at
least five approximately vertically disposed lower screen
panels (16), each being trapezoidal in shape and connected
along vertical sides to form an annular configuration, and
at least five upper screen panels (18) disposed adjacent to
each other on top of said lower panels, wherein said upper
and lowers panels (16,18) substantially enclose the area in
front of said screen assembly.
Claim 9
Dependent Claim
32 words
A structure as claimed in claim 8, further
comprising a horizontally disposed hexagonal screen panel
(20), disposed at the top of said screen assembly, and
adjacent to said upper screen panels (18).
Claim 10
Dependent Claim
45 words
A structure as claimed in any preceding claim,
wherein said screen assembly, when viewed from said front
side, creates a field of regard which covers 360 degrees of
a horizontal angular field of view and at least 120 degrees
of a vertical field of view.
Claim 11
Dependent Claim
65 words
An image projection system (22; 24, 26, 28) comprising: a projection screen structure (10) as claimed in any preceding claim;
and a plurality of image projectors (30,68,70,72)
disposed on the rear of said screen assembly, said image
projectors (30,68,70,72) each producing a respective image
on one of said screen panels (12,16,18,20) so that said
images can be viewed from the front of said screen
assembly.
Claim 12
Dependent Claim
40 words
An image projection system as claimed in claim
11, wherein said projectors (30,68,70,72) are arranged to
project light rays containing said image, the corresponding central rays (34)
being substantially orthogonal to the respective rear surfaces of said screen
panels (12,16,18,20).
Claim 13
Dependent Claim
37 words
An image projection system as claimed in claim
11 or claim 12, when dependent on claim 5, wherein light from said
projectors (30,68,70,72) is permitted to pass through
said reduced portions and to said screen panels
(12,16,18,20).
Claim 14
Dependent Claim
102 words
An image projection system as claimed in any one
of claims 11 to 13, further comprising a video image
generation system (66) including: a plurality of image signal sources for
generating video image signals (78,80,82,84,88); a switch matrix means (76) for transmitting (74) said
image signals (78,80,82,84,88) to said projectors
(30,68,70,72); and frame store means (90) connected to each of said
projectors (30,68,70,72) for storing individual frames of
said video signal and also for transmitting said individual
frames of said signals to said projectors (30,68,70,72),
whereby selected ones of said projectors (30,68,70,72) will
transmit a still image to said screen panels (12,16,18,20).
Claim 15
Dependent Claim
44 words
An image projection system as claimed in claim
14, further comprising a host computer (92) coupled to said
switch matrix means (76) for controlling the transfer of
video images through said switch matrix means (76) to said
projectors (30,68,70,72) and frame store means (90).
References Cited (Backward Citations)
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