FreshPatents.com Logo
stats FreshPatents Stats
1 views for this patent on FreshPatents.com
2012: 1 views
Updated: August 12 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

Follow us on Twitter
twitter icon@FreshPatents

Reflection reducing film, optical member and optical system

last patentdownload pdfdownload imgimage previewnext patent


20120276350 patent thumbnailZoom

Reflection reducing film, optical member and optical system


A reflection reducing film is provided on a surface of an optical substrate, and is sequentially provided with a buffer layer and a reflection reducing layer. The reflection reducing layer includes first to eighth layers sequentially laminated from the side of the buffer layer. The first and sixth layers are made of a low-refractive index material having a refractive index in the range of 1.35 to 1.50 at the d-line, the third, fifth and seventh layers are made of an intermediate-refractive index material having a refractive index in the range of 1.55 to 1.85 at the d-line, and the second, fourth and eighth layers are made of a high-refractive index material having a refractive index in the range of 1.70 to 2.50 at the d-line.

Inventor: Etsuo TERAYAMA
USPTO Applicaton #: #20120276350 - Class: 428212 (USPTO) - 11/01/12 - Class 428 
Stock Material Or Miscellaneous Articles > Structurally Defined Web Or Sheet (e.g., Overall Dimension, Etc.) >Including Components Having Same Physical Characteristic In Differing Degree

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120276350, Reflection reducing film, optical member and optical system.

last patentpdficondownload pdfimage previewnext patent

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional of co-pending U.S. application Ser. No. 12/470,216 filed on May 21, 2009, which claims priority under 35 USC 119 from Japanese Patent Application No. 2008-134224 filed May 22, 2008 and Japanese Patent Application No. 2008-134225 filed May 22, 2008; the entire contents of which are incorporated herein by reference.

BACKGROUND

1. Technical Field

The present invention relates to a reflection reducing film which is formed on one face of an optical member such as a lens, a filter and the like to exhibit a reflection reducing effect with respect to light having a predetermined wavelength band, and an optical member and an optical system which have the reflection reducing film.

2. Related Art

Generally, an image pickup apparatus such as a photographic camera or a TV broadcasting camera has a number of optical members such as lenses, prisms, filters and the like disposed on an optical path thereof. When light is incident on surfaces of the respective optical members, a portion of the light becomes reflection light. Herein, when the number of the optical members increases, a total amount of the reflection light increases and thus defects, for example, flare and ghost occur in images of a broadcasting camera. In addition, since reflectances on the surfaces of the optical members have distribution with respect to a wavelength of the incident light and wavelength dependences of various reflectances are shown in accordance with constituent materials for the respective optical member, a chromaticity balance deteriorates, and thus it is necessary to adjust a white balance in an entire image pickup apparatus.

Accordingly, a surface of each optical member may be provided with a reflection reducing film (also referred to as the antireflection film). The reflection reducing film is a multilayer film in which dielectric films having different refractive indices are combined, and a configuration thereof is disclosed in, for example, the following Non-Patent Document 1. In the Non-Patent Document 1 (“Light•Thin Film Manual”, The Optronics Co., Ltd, Oct. 9, 1989, P 246-247), an antireflection film having a 5-layer structure is disclosed and an attempt has been made to achieve a low reflectance over a wider band.

In addition to the Non-Patent Document 1, Patent Document 1 (JP-A-2002-267801) discloses an antireflection film having a 9-layer structure.

For example, the antireflection film disclosed in the above Non-Patent Document 1 exhibits relatively excellent low reflectance characteristics when being provided on an optical substrate having a refractive index lower than 1.70 at the d-line. However, it is found that there is a tendency in which flatness in reflectance distribution is lost as described later and a reflectance is thus increased at a specific wavelength when the antireflection film is provided on an optical substrate having a high refractive index higher than 1.75.

Tables 1 and 2 show basic data (constituent materials, refractive indices and optical film thicknesses) of antireflection films (Related examples 1 and 2) having a laminate structure corresponding to the antireflection film disclosed in Non-Patent Document 1. And FIG. 45 shows reflectance distributions of the antireflection films having the basic data of Tables 1 and 2.

TABLE 1 OPTICAL FILM RELATED CONSTITUENT REFRACTIVE THICKNESS EXAMPLE 1 MATERIAL INDEX N INDEX Nxd OPTICAL BK-7 1.51 —

Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Reflection reducing film, optical member and optical system patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Reflection reducing film, optical member and optical system or other areas of interest.
###


Previous Patent Application:
Anti-corrosion treatment process for aluminum or aluminum alloy and aluminum or aluminum alloy article thereof
Next Patent Application:
Film adhesive bonding apparatus and process
Industry Class:
Stock material or miscellaneous articles
Thank you for viewing the Reflection reducing film, optical member and optical system patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 1.38405 seconds


Other interesting Freshpatents.com categories:
Electronics: Semiconductor Audio Illumination Connectors Crypto

###

Data source: patent applications published in the public domain by the United States Patent and Trademark Office (USPTO). Information published here is for research/educational purposes only. FreshPatents is not affiliated with the USPTO, assignee companies, inventors, law firms or other assignees. Patent applications, documents and images may contain trademarks of the respective companies/authors. FreshPatents is not responsible for the accuracy, validity or otherwise contents of these public document patent application filings. When possible a complete PDF is provided, however, in some cases the presented document/images is an abstract or sampling of the full patent application for display purposes. FreshPatents.com Terms/Support
-g2--0.3435
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120276350 A1
Publish Date
11/01/2012
Document #
13549086
File Date
07/13/2012
USPTO Class
428212
Other USPTO Classes
International Class
32B7/02
Drawings
46



Follow us on Twitter
twitter icon@FreshPatents