Process for the production of a telecentric light beam, device for carrying out this process and process for the production of an HOE
First Claim
1. A device for the production of a telecentric light beam, comprising:
- at least one holographic optical element, having a focal point; and
means located at least approximately at the focal point of said at least one holographic optical element for deflecting a beam of light through an angular range to produce a continuum of beams diverging toward the at least one holographic optical element so that the diverging beams are received thereby in the angular range; and
said at least one holographic optical element comprising means for deflecting the diverging beams at all angles in the angular range, such that the diverging beams are deflected by diffraction in one direction, thereby to obtain a telecentric light beam, wherein the at least one holographic optical element includes a flat holographic element formed on a prism as a carrier, whereby the prism is adapted for deflecting the diffracted light beams from the one direction into another direction.
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Accused Products
Abstract
A light beam is repeatedly deflected in the longitudinal direction through a holographic element HOE by means of a rotating multi-faceted mirror. This HOE is so formed that the beam entering at different angles leaves the HOE as a telecentric beam. Through a further HOE the telecentric beam is diffracted onto an electro-optic transducer. In the region of the telecentric beam is located an object to be measured, and the time of the interruption of the telecentric beam by means of this object enables the dimension of the latter to be determined. The production of the telecentric beam and the deflection of the latter onto the transducer by means of the HOE allows a simple cost-effect manufacture as well as a simple evalution of the measurements with increased precision. The manufacture of the HOE is likewise simple.
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Citations
10 Claims
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1. A device for the production of a telecentric light beam, comprising:
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at least one holographic optical element, having a focal point; and means located at least approximately at the focal point of said at least one holographic optical element for deflecting a beam of light through an angular range to produce a continuum of beams diverging toward the at least one holographic optical element so that the diverging beams are received thereby in the angular range; and said at least one holographic optical element comprising means for deflecting the diverging beams at all angles in the angular range, such that the diverging beams are deflected by diffraction in one direction, thereby to obtain a telecentric light beam, wherein the at least one holographic optical element includes a flat holographic element formed on a prism as a carrier, whereby the prism is adapted for deflecting the diffracted light beams from the one direction into another direction. - View Dependent Claims (2, 3, 4)
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5. A process for the production of a telecentric light beam, comprising the step of:
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deflecting a beam of light through an angular range at the focal point of at least one holographic optical element, to produce continuum of beams diverging toward the at least one holographic optical element so that the diverging beams are received thereby in the angular range; and for all angles of the diverging beams in the angular range, deflecting the diverging beams with the at least one holographic optical element, such that the diverging beams are deflected by diffraction in one direction, thereby to obtain a telecentric light beam, wherein in addition to the telecentric light beam diffracted by the at least one holographic optical element a further light beam of a different order of diffraction is deflected by the at least one holographic optical element and is utilized for auxiliary functions. - View Dependent Claims (6, 7, 8)
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9. A process for the production of a telecentric light beam, comprising the steps of:
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deflecting a beam of light through an angular range at the focal point of at least one holographic optical element, to produce a continuum of beams diverging toward the at least one holographic optical element so that the diverging beams are received thereby in the angular range; and for all angles of the diverging beams in the angular range, deflecting the diverging beams with the at least one holographic optical element, such that the diverging beams are deflected by diffraction in one direction, thereby to obtain a telecentric light beam, wherein the at least one holographic optical element comprises first and second holographic optical elements, said step of deflecting the diverging beams with at least one holographic optical element including the step of deflecting the diverging beams with the first holographic optical element onto the second holographic optical element and deflecting the beam deflected by the first holographic optical element with the second holographic optical element such that the telecentric light beam is formed in a single plane and such that the distance measured in the plane in a direction perpendicular to the one direction between portions of the telecentric light beam originating at any two spaced apart angles in the diverging beams is linearly related to the difference between the two angles.
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10. A process for the production of a telecentric light beam, comprising the step of:
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deflecting a beam of light through an angular range at the focal point of at least one holographic optical element, to produce a continuum of beams diverging toward the at least one holographic optical element so that the diverging beams are received thereby in the angular range; and for all angles of the diverging beams in the angular range, deflecting the diverging beams with the at least one holographic optical element, such that the diverging beams are deflected by diffraction in one direction, thereby to obtain a telecentric light beam, wherein the at least one holographic optical element comprises a single curved holographic optical element, the step of deflecting the diverging beams with at least one holographic optical element including the step of deflecting the diverging beam with the curved holographic optical element such that the telecentric light beam is formed in a single plane and such that the distance measured in the plane in a direction perpendicular to the one direction between portions of the telecentric light beam originating at any two spaced apart angles in the diverging beams is linearly related to the difference between the two angles.
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Specification