Light absorption device for the prevention of stray light in particular in a phototypesetter
First Claim
1. An absorption device for use in a light ray projection system of a phototypesetter, having a primary ray and a secondary ray projection and wherein the secondary ray is directed into the primary ray with a partially translucent and partially reflecting surface, said surface being arranged within the path of said primary ray and said secondary ray projection, and including an absorption body disposed in an extension of the secondary ray projection from the backside of said partially reflecting and partially translucent surface, said absorption body arranged to absorb radiation of said secondary ray, said absorption body having a concave surface arranged to direct said secondary ray at an angle relative to the direction of the secondary ray projection and at a focal point, and black body means for absorbing light placed at the focal point for absorbing light from said concave surface.
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Accused Products
Abstract
A phototypesetter has an optical path including a beam splitter intersecting the main light path and an auxiliary light path for reflecting the auxiliary light path into the main light path. An absorption element with a concave front surface is mounted behind the beam splitter to absorb the non-reflected light from the auxiliary beam. Additionally, the concave surface directs the nonabsorbed light to a light absorbent body.
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Citations
1 Claim
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1. An absorption device for use in a light ray projection system of a phototypesetter, having a primary ray and a secondary ray projection and wherein the secondary ray is directed into the primary ray with a partially translucent and partially reflecting surface, said surface being arranged within the path of said primary ray and said secondary ray projection, and including an absorption body disposed in an extension of the secondary ray projection from the backside of said partially reflecting and partially translucent surface, said absorption body arranged to absorb radiation of said secondary ray, said absorption body having a concave surface arranged to direct said secondary ray at an angle relative to the direction of the secondary ray projection and at a focal point, and black body means for absorbing light placed at the focal point for absorbing light from said concave surface.
Specification
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- Resources
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Current AssigneeLinotype
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Original AssigneeMichael Plaot
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InventorsPlaot, Michael
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Primary Examiner(s)Adams, Russell E.
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Application NumberUS05/912,261Time in Patent Office606 DaysField of Search354/4, 354/5, 354/10, 354/12, 354/13, 350/276 R, 350/276 SL, 350/278US Class Current396/549CPC Class CodesB41B 21/16 Optical systems shutters B4...G02B 5/003 Light absorbing elementsG02B 5/22 Absorbing filters G02B5/201...
