Dichroic mirror and an image projection apparatus using the same

Details Dichroic mirror and an image projection apparatus using the same Dichroic mirror and an image projection apparatus using the same

1993-02-26

1994-06-14

Powell, Mark R.

Television

Video display

Projection device

359634, 348780, H04N 931

Patent

active

053214994

ABSTRACT:
An image projection apparatus such as a video projector or projection television is provided for decreasing light loss. The apparatus has three cathode ray tubes for respectively providing images of red, green and blue, two dichroic mirrors for combining the images onto the same axis, and a lens group for enlarging and projecting the combined image toward a screen, wherein the inclination of each dichroic mirror is adjusted such that the incident angle of light incoming from the cathode ray tube to the dichroic mirror is less than 45.degree.. Thus, the degree of stop-band shift due to refractive index variations of an incidence medium is decreased. Also, the reflectance for incoming light having a wavelength coincident with the stop band is increased.

REFERENCES:
patent: 4687301 (1987-08-01), Ledebuhr
patent: 5198930 (1993-03-01), Muratomi

Affiliated with

Also associated with

Rating

Dichroic mirror and an image projection apparatus using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dichroic mirror and an image projection apparatus using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dichroic mirror and an image projection apparatus using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1253119