Rear projector
First Claim
1. A rear projector comprising:
- a housing;
a screen arrangement on a front side of the housing for displaying a video picture;
a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle;
a deflecting device for scanning said light bundle;
said deflecting device for deflecting said light bundle over a total angle α
with respect to vertical scanning;
a deflecting mirror which is located in the housing and arranged at an angle δ
;
wherein the light bundle exiting from a real or virtual vertex of the total deflection angle α
is deflected onto the screen by the deflecting mirror;
wherein the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle β
of the light bundle to the surface of the screen during deflection is less than 20° and
the angle δ
is given by andwherein angle δ
is determined for curved mirror surfaces of the deflecting mirror between the projection surface given by the screen and the chord between the extreme points of incidence of the light bundle on the deflecting mirror during vertical scanning over the angle α
.
3 Assignments
0 Petitions
Accused Products
Abstract
In a rear projector with a housing on whose front side is arranged a screen for displaying a video picture, with a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle, with a deflecting device for scanning this light bundle, wherein the light bundle is deflected by the deflecting device over a total angle α with respect to vertical scanning, and with a deflecting mirror which is located in the housing and arranged at an angle δ, wherein the light bundle exiting from a real or virtual vertex of the total deflection angle α is deflected onto the screen by the deflecting mirror, the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle β of the light bundle to the surface of the screen during deflection is less than 20° and the angle δ is given by
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Citations
8 Claims
-
1. A rear projector comprising:
-
a housing;
a screen arrangement on a front side of the housing for displaying a video picture;
a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle;
a deflecting device for scanning said light bundle;
said deflecting device for deflecting said light bundle over a total angle α
with respect to vertical scanning;
a deflecting mirror which is located in the housing and arranged at an angle δ
;
wherein the light bundle exiting from a real or virtual vertex of the total deflection angle α
is deflected onto the screen by the deflecting mirror;
wherein the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle β
of the light bundle to the surface of the screen during deflection is less than 20° and
the angle δ
is given byand wherein angle δ
is determined for curved mirror surfaces of the deflecting mirror between the projection surface given by the screen and the chord between the extreme points of incidence of the light bundle on the deflecting mirror during vertical scanning over the angle α
.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification