Optical coating and assembly used as a band pass interference filter reflecting in the ultraviolet and infrared

• US 3,247,392 A
• Filed: 05/17/1961
• Issued: 04/19/1966
• Est. Priority Date: 05/17/1961
• Status: Expired due to Term

• Current Assignee: Alfred J. Thelen
• Original Assignee: Alfred J. Thelen
• Inventors: Thelen, Alfred J.
• Application Number:
  US04/110,781
• Time in Patent Office: 1,798 Days
• US Class Current: 250/226
• CPC Class Codes: C03C 17/3452 comprising a fluoride
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
• CPC Class Codes: G02B 5/285 comprising deposited thin solid films G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361
• CPC Class Codes: H01L 31/02168 the coatings being antireflective or having enhancing optical properties for the solar cells
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Claims

8. IN AN ASSEMBLY OF THE CHARACTER DESCRIBED FOR A PREDETERMINED DESING WAVELENGTH, A PHOTOSENSITIVE DEVICE HAVING A PREDETERMINED SPECTRAL RESPONSE, A COVER OF TRANSPARENT MATERIAL MOUNTED OVER THE PHOTOSENSITIVE DEVICE, AND AN OPTICAL COATING DISPOSED ON THE COVER AND HAVING A BAND PASS SUBSTANTIALLY IDENTICAL TO THE SPECTRAL RESPONSE OF THE PHOTOSENSITIVE DEVICE, THE OPTICAL COATING COMPRISING A PLURALITY OF SUPERPOSED LAYERS DISPOSD ON ONE SURFACE OF THE COVER, THE LAYERS BEING FORMED OF THREE DIFFERENT MATERIALS A, B AND C, EACH OF THE MATERIALS HAVING A DIFFERENT INDEX OF REFRACTION, THE LAYERS BEING ARRANGED TO HAVE A PERIODICITY OF ABCBA AND EACH LAYER HAVING AN OPTICAL THICKNESS OF ONE-QUARTER OF THE DESIGN WAVELENGTH.