CH280883A - Optical shielding device. - Google Patents

Optical shielding device.

Info

Publication number
CH280883A
CH280883A CH280883DA CH280883A CH 280883 A CH280883 A CH 280883A CH 280883D A CH280883D A CH 280883DA CH 280883 A CH280883 A CH 280883A
Authority
CH
Switzerland
Prior art keywords
shielding device
optical shielding
diaphragm
optical
layers
Prior art date
Application number
Other languages
German (de)
Inventor
Welter Otto
Original Assignee
Welter Otto
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Welter Otto filed Critical Welter Otto
Publication of CH280883A publication Critical patent/CH280883A/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/16—Shades; shields; Obturators, e.g. with pinhole, with slot

Description

  

  Optische     Abschirmvorrichtung.       Gegenstand der vorliegenden Erfindung  ist eine optische     Abschirmvorrichtung,    deren  Blende wechselweise aus Schichten verschie  dener Lichtdurchlässigkeit aufgebaut ist.  



  Gemäss vorliegender Erfindung nimmt nun  die Dicke der Blende von der einen zur andern  Seite stetig ab.  



  Vorzugsweise umfasst die     Abschirmvorrich-          tung    auch ein Gegenelement aus Klarmaterial,  um die     Prismenwirkung    der Blende aufzu  heben.  



  Die beiliegende Zeichnung stellt schema  tisch ein Ausführungsbeispiel der optischen       Abschirmvorrichtung    gemäss vorliegender Er  findung dar.  



  In der Blende 3 sind mit 1 die Schichten  aus     .lichtdurchlässigerem    Material, mit 2 die  jenigen aus weniger lichtdurchlässigem Mate  rial bezeichnet. Die Blende ist keilförmig zu  geschnitten, so dass ihre Dicke von der einen  zur andern Seite stetig abnimmt. Bezeichnet  man mit 7 die Empfangszonen für die Emp  fänger 6, so erkennt man, dass diese Empfangs  zonen 7 auf der linken Seite der Blende be  deutend kleiner sind als auf der rechten Seite.    Wird die     Abschirmvorrichtung    zum Beispiel  in einer Blendschutzbrille für Autofahrer ver  wendet, so ist die Sicht auf die rechte Stra  ssenseite bedeutend besser als auf die linke  Strassenseite, von wo die blendenden Licht  strahlen der Scheinwerfer von kreuzenden  Automobilen herkommen.  



  Cm die     Prismenwirkung    aufzuheben, die  vom keilförmigen Zuschnitt der Blende 3 her-.  rührt, besitzt. die     Abschirmvorrichtung    noch  einen Gegenkeil 4 aus Klarmaterial.



  Optical shielding device. The present invention relates to an optical shielding device whose diaphragm is constructed alternately from layers of different light transmittance.



  According to the present invention, the thickness of the diaphragm now steadily decreases from one side to the other.



  The shielding device preferably also comprises a counter-element made of clear material in order to cancel out the prismatic effect of the diaphragm.



  The accompanying drawing is a schematic diagram of an embodiment of the optical shielding device according to the present invention.



  In the diaphragm 3 are 1 with the layers of .lichttransparem material, with 2 those of less transparent mate rial called. The diaphragm is cut in a wedge shape so that its thickness decreases steadily from one side to the other. If the reception zones for the receiver 6 are designated by 7, it can be seen that these reception zones 7 are significantly smaller on the left side of the panel than on the right side. If the shielding device is used in anti-glare goggles for motorists, for example, the view of the right side of the street is significantly better than that of the left side of the street, from where the dazzling light from the headlights of crossing automobiles come from.



  Cm cancel the prism effect, which is caused by the wedge-shaped cut of the aperture 3. stirs, owns. the shielding device still has a counter wedge 4 made of clear material.

Claims (1)

PATENTANSPRUCH: Optische Abschirmvorrichtung, deren Blende wechselweise aus Schichten verschie dener Lichtdurchlässigkeit aufgebaut ist, da durch gekennzeichnet, dass die Dicke der Blende von der einen zur andern Seite stetig abnimmt. UNTERANSPRUCH: Optische Abschirmvorrichtung nach Pa tentanspruch, dadurch gekennzeichnet, dass sie ein Gegenelement aus Klarmaterial auf weist, um die Prismenwirkung der Blende auf zuheben. PATENT CLAIM: Optical shielding device, the screen of which is built up alternately from layers of different light permeability, characterized in that the thickness of the screen decreases steadily from one side to the other. SUBSTANTIAL CLAIM: Optical shielding device according to patent claim, characterized in that it has a counter element made of clear material in order to cancel the prismatic effect of the diaphragm.
CH280883D 1949-12-17 1949-12-17 Optical shielding device. CH280883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH280883T 1949-12-17

Publications (1)

Publication Number Publication Date
CH280883A true CH280883A (en) 1952-02-15

Family

ID=4482892

Family Applications (1)

Application Number Title Priority Date Filing Date
CH280883D CH280883A (en) 1949-12-17 1949-12-17 Optical shielding device.

Country Status (1)

Country Link
CH (1) CH280883A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133139A (en) * 1958-05-19 1964-05-12 George L Beers Directional glare reducing viewing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133139A (en) * 1958-05-19 1964-05-12 George L Beers Directional glare reducing viewing device

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