Illumination – Plural light sources – Particular wavelength
Reexamination Certificate
2001-02-20
2003-02-25
Sember, Thomas M. (Department: 2875)
Illumination
Plural light sources
Particular wavelength
C362S800000, C362S249070, C362S259000, C362S296040, C362S297000, C362S346000
Reexamination Certificate
active
06523977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an illuminating apparatus for a projection display, more particularly to an illuminating apparatus that utilizes a plurality of primary color light sources to generate input light for a projection display.
2. Description of the Related Art
In a conventional projection display, input light is filtered and separated into color components that are modulated and subsequently recombined to generate an image output.
Referring to
FIG. 1
, a conventional illuminating apparatus
1
that is used to generate input light for a projection display (not shown) is shown to include an elliptic reflector
11
, a single lamp
14
serving as a light source, and a rod integrator
15
. The elliptic reflector
11
has first and second focal points
12
,
13
. The lamp
14
is disposed at the first focal point
12
. The elliptic reflector
11
reflects light rays that radiate from the lamp
14
. The integrator
15
has an input side
150
coincident with the second focal point
13
such that the light rays reflected by the elliptic reflector
11
converge at the input side
150
. Light from the integrator
15
is subsequently processed by
2
condensers
16
,
17
and is filtered and separated into primary color components, such as red, blue and green color components.
Referring to
FIG. 2
, another conventional illuminating apparatus
2
for a projection display
25
is shown to include a single light source
21
, a parabolic reflector
22
, and first and second lens array integrators
23
,
24
. The light source
21
is disposed at a focal point of the parabolic reflector
22
. The first lens array integrator
23
is disposed between the parabolic reflector
22
and the second lens array integrator
24
. The parabolic reflector
22
reflects light rays, which radiate from the light source
21
, in parallel toward the first and second lens array integrator
23
,
24
. Light from the integrators
23
,
24
is processed, such as by filtering, color separation and modulation before being projected on a display screen.
The light source used in the aforesaid conventional illuminating apparatuses
1
,
2
can be a halogen lamp or an arc lamp, such as a high-voltage mercury lamp, a metal halide lamp and a xenon lamp. The following are some of the drawbacks of the conventional illuminating apparatuses
1
,
2
:
1. Since the light source is similar to incandescent light, the light therefrom can hardly be separated into pure color components due to limitations of the color separation device, thereby resulting in low color purity of the image output.
2. Due to low color purity, color characteristics are difficult to adjust, thereby resulting in an image output with a narrow color band region and in difficulty in attaining natural color rendering.
3. Due to the high power consumption and high heat generation of the light source, the light source has a relatively short service life. Furthermore, when the single light source breaks down, the conventional illuminating apparatus cannot work.
4. Since ultraviolet and infrared rays in the light source should be filtered prior to color separation, special filter lenses are necessary, thereby resulting in a relatively high cost.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide an illuminating apparatus that utilizes a plurality of primary color light sources to generate input light for a projection display which can overcome the drawbacks associated with the aforesaid prior art.
According to the present invention, an illuminating apparatus comprises:
a plurality of light sources that generate a plurality of primary color light components;
a reflector unit for receiving the primary color light components from the light sources; and
an integrator having an input side to receive the primary color light components reflected by the reflector unit.
REFERENCES:
patent: 5631721 (1997-05-01), Stanton et al.
patent: 5636003 (1997-06-01), Tanitsu et al.
patent: 5659409 (1997-08-01), Ooi et al.
patent: 5754278 (1998-05-01), Kurtz
patent: 5808759 (1998-09-01), Okamori et al.
patent: 5851063 (1998-12-01), Doughty et al.
patent: 5961201 (1999-10-01), Gismondi
patent: 6102552 (2000-08-01), Tullis
patent: 6139166 (2000-10-01), Marshall et al.
patent: 6174060 (2001-01-01), Imaoka et al.
patent: 6231193 (2001-05-01), Sugawara
patent: 6257737 (2001-07-01), Marshall et al.
patent: 6273589 (2001-08-01), Weber et al.
patent: 6344929 (2002-02-01), Sugawara
patent: 2001/0033418 (2001-10-01), Hayashi
patent: 2002/0015306 (2002-02-01), Yamamoto
Chan Sheng-Hsiung
Chuang Fu-Ming
Lee Shih-Ping
Tsai Han-Wen
Amarantides John
Merchant & Gould P.C.
Prokia Technology Co., Ltd.
Sember Thomas M.
LandOfFree
Illuminating apparatus including a plurality of light... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Illuminating apparatus including a plurality of light..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Illuminating apparatus including a plurality of light... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3149206