Apparatus for measuring characteristics of optical angle

An optical angle characteristic measuring apparatus capable of measuring angle distribution of intensity of light emitted from a sample, comprising:

• an ellipsoidal mirror having a first focal point and a second focal point, and for reflecting and condensing the emitted light from a sample disposed in the vicinity of the first focal point;
• an image-forming lens disposed in the vicinity of the second focal point, at which light reflected from said ellipsoidal mirror converges, for forming, on a record face, an image formed on said ellipsoidal mirror;
• an aperture disposed in the vicinity of the second focal point, light reflected from the ellipsoidal mirror passing through the aperture;
• a recorder for recording said image formed by said image-forming lens;
• and;
• an illumination light source for transmitting light to the sample, said illumination light source being arranged to transmit light to the sample at an angle substantially normal to an alignment of the lens, aperture and recorder,
• the sample and the light source being located substantially outside of a space lying between the two focal points.