Coordinate detecting apparatus for use with optical projecting apparatus
First Claim
1. A coordinate detecting apparatus for use with an optical projecting apparatus which includes an illuminating light source for projecting an optically recorded medium, an illuminating optical system, a recorded-medium support member, a projecting optical system and a screen, said coordinate detecting apparatus comprising:
- light spot generating means including a cathode-ray tube for generating a light spot to scan the screen on which an optical picture image is projected in a composed manner, a deflecting circuit and a composite projecting optical system;
photoelectric detecting means for detecting the light spot on the screen; and
coordinate position detecting means responsive both to the photoelectrically detected output signal of said photoelectric detecting means and to the deflecting signal of said cathoderay tube for detecting the coordinate position of said photoelectric detecting means on the screen.
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Abstract
A coordinate detecting apparatus for use with an optical projecting apparatus, which includes an illuminating light source for projecting an optically recorded medium, an illuminating optical system, a recorded-medium support member, a projecting optical system and a screen, the coordinate detecting apparatus comprising light spot generating means including a cathode-ray tube for generating the light spot to scan the screen on which an optical picture image is projected in a composed manner, a deflecting circuit and a composite projecting optical system for generating a light spot and for projecting the same on the screen, photoelectric detecting means for detecting the light spot on the screen, and coordinate position detecting means responsive both to the photoelectric detected output signal of the photoelectric detecting means and to the deflecting signal of the light spot generating means for detecting the coordinate position of the photoelectric detecting means on the screen.
23 Citations
4 Claims
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1. A coordinate detecting apparatus for use with an optical projecting apparatus which includes an illuminating light source for projecting an optically recorded medium, an illuminating optical system, a recorded-medium support member, a projecting optical system and a screen, said coordinate detecting apparatus comprising:
- light spot generating means including a cathode-ray tube for generating a light spot to scan the screen on which an optical picture image is projected in a composed manner, a deflecting circuit and a composite projecting optical system;
photoelectric detecting means for detecting the light spot on the screen; and
coordinate position detecting means responsive both to the photoelectrically detected output signal of said photoelectric detecting means and to the deflecting signal of said cathoderay tube for detecting the coordinate position of said photoelectric detecting means on the screen.
- light spot generating means including a cathode-ray tube for generating a light spot to scan the screen on which an optical picture image is projected in a composed manner, a deflecting circuit and a composite projecting optical system;
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2. The coordinate detecting apparatus of claim 1, wherein the composite projecting optical system includes a projecting lens for projecting the light spot onto the screen, and a half mirror for composing the light spot and the projected image of the recorded-medium.
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3. The coordinate detecting apparatus of claim 1, wherein said light spot has a wave length less than about 380 nm or greater than about 760 nm.
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4. The coordinate detecting apparatus of claim 1, wherein said photoelectric detecting means includes means for activating said light spot generating means when said photoelectric detecting means is actuated.
Specification