Optics: image projectors – Composite projected image – Multicolor picture
Patent
1997-12-18
2000-05-16
Dowling, William C.
Optics: image projectors
Composite projected image
Multicolor picture
353 20, 349 9, 359488, G03B 2114
Patent
active
060626941
ABSTRACT:
The present invention relates to a projection type display apparatus which utilizes a polarizing beam splitter and/or a color separating/combining optical system, each being constituted by an optically transparent material block having a specific characteristic, thereby being capable of securing optically stable performances against influences of various thermal and external stresses and suppressing image quality deterioration to a low level. In particular, in this projection type display apparatus, the polarizing beam splitter used for a polarized light separating optical system and analyzing optical system, and/or an optical member servicing as a color separating/combining optical system are constituted by an optically transparent material block in which a wavelength where the absolute value of a photoelastic constant becomes a minimum level exists in a wavelength range of a blue light component.
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Hattori Tetsuo
Ishibashi Kazufumi
Kusano Masaaki
Oikawa Yoshiro
Ueda Motoi
Dowling William C.
Nikon Corporation
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