Claims
- 1. A machine for drawing on a photosensitive plate, comprising:
- an electro-optical imager having an optic axis x-x', the imager including a plurality of fixed image points arranged in a preselected array,
- means for selectively controlling the optical state of each point of the imager at the same time for forming a pattern of a number of points which have an optical state different from the remaining points,
- photosensitive plate means aligned with the optic axis of the imager,
- the dimensions of each point of the imager corresponding to the smallest detail drawing to be formed on the plate,
- means for selectively transmitting a beam of light along the optic axis x-x' when said pattern is formed on the imager,
- an objective located on the side of the imager opposite the means for transmitting for providing a magnification n and having the axis x-x', said objective being capable of receiving the entire light beam which passes out of said imager,
- means for displacing said imager and said photosensitive plate means with respect to each other in a plane at right angles to the axis x-x' and in the two orthogonal directions X and Y,
- means for measuring the relative displacement of said imager and of said photosensitive plate in the directions aforesaid,
- means for controlling the means which produce the relative displacement of said imager and of said photosensitive plate as a function of the indication of said means for measuring the relative displacement of said imager and of the photosensitive plate.
- 2. A machine according to claim 1, wherein each point of the imager is capable of assuming two optical states, namely a light-emitting state and a non-emitting state.
- 3. A machine according to claim 1, wherein said imager is capable of assuming two optical states, namely a transparent state and an opaque state.
- 4. A machine according to claim 3, wherein the electro-optical imager is of the liquid-crystal type, wherein the points of the imager are disposed in lines and columns and wherein each point of said imager is a square of side P.
- 5. A machine according to claim 1, wherein the means for controlling said motors comprise means for comparing the displacements of the photosensitive plate in both directions as measured by said measuring means with pre-indicated displacements, means for producing signals which are representative of the differences .epsilon..sub.X and .epsilon..sub.Y between the measured displacements and the pre-indicated displacements, said signals being intended to determine the displacement which each motor is intended to impart to the imager support.
- 6. A machine according to claim 1 wherein said imager comprises q + r lines corresponding to the direction X and q + r columns corresponding to the direction Y, only those points of a matrix constituted by q adjacent lines and q adjacent columns being employed to provide a light beam to the objective at the same time.
- 7. A machine according to claim 6, wherein said machine comprises means for comparing the quantities (1/n.).epsilon..sub.X and (1/n.).epsilon..sub.Y with a whole number of pitches P of the imager k.sub.x p and k.sub.y p respectively, means for displacing the points of the imager of the different optical state by said whole number of pitches k.sub.x in the direction X, means for displacing the matrix of utilized points of the imager by said whole number of pitches k.sub.y in the direction Y, means for producing signals which are representative of the quantities (1/n).epsilon..sub.X - k.sub.x p and (1/n).epsilon..sub.Y - k.sub.y p, said signals being intended to determine the displacement which each motor is intended to impart to the imager support.
Priority Claims (1)
Number |
Date |
Country |
Kind |
74 16288 |
May 1974 |
FR |
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Parent Case Info
This is a continuation of application Ser. No. 572,096 filed Apr. 28, 1975 and now abandoned.
US Referenced Citations (10)
Non-Patent Literature Citations (1)
Entry |
Electronics Review, 4/17/1967, vol. 40, No. 8, pp. 47 & 48, Boosting IC's. |
Continuations (1)
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Number |
Date |
Country |
Parent |
572096 |
Apr 1975 |
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