Title: Optical projecting device and focus adjusting method of same
Application Number: 95115345 Application Date: 1995.08.11
Publication Number: 1123419 Publication Date: 1996.05.29
Approval Pub. Date: 2001.05.30 Granted Pub. Date: 2001.05.30
International Classifi-cation: G02B27/18;H04N9/31
Applicant(s) Name: Asahi Kogaku Kogyo Kabushiki Kaisha Address:
Inventor(s) Name: Yasuyuki Teshima;Nobutaka Mineto;Masakuni Iwanaka
Attorney & Agent: WANG YIPING
Abstract:
    A projector in which light emitted from a light source is made incident upon a transmission type picture panel and is projected onto a screen through a projection lens system having a condenser lens and an imaging lens, not only can a high quality image, whose contrast is always kept high regardless of the magnification be obtained, but also an optimum quantity of light can always be provided. The condenser lens and the imaging lens are relatively movable with respect to the transmission type picture panel in an optical axis direction. Thus, when a projection distance from the projection lens system to the screen is varied, both the condenser lens and the imaging lens are relatively moved, with respect to the transmission type picture panel, to adjust a focus of the emitted light on the screen.
Time: 10
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