TW200641408A - Neutral density filter - Google Patents

Neutral density filter

Info

Publication number
TW200641408A
TW200641408A TW094117141A TW94117141A TW200641408A TW 200641408 A TW200641408 A TW 200641408A TW 094117141 A TW094117141 A TW 094117141A TW 94117141 A TW94117141 A TW 94117141A TW 200641408 A TW200641408 A TW 200641408A
Authority
TW
Taiwan
Prior art keywords
refractive index
index films
film layer
high refractive
low refractive
Prior art date
Application number
TW094117141A
Other languages
Chinese (zh)
Other versions
TWI274192B (en
Inventor
Hsing-Ya Liu
Original Assignee
Asia Optical Co Inc
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 Asia Optical Co Inc filed Critical Asia Optical Co Inc
Priority to TW94117141A priority Critical patent/TWI274192B/en
Publication of TW200641408A publication Critical patent/TW200641408A/en
Application granted granted Critical
Publication of TWI274192B publication Critical patent/TWI274192B/en

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Abstract

The present invention is a neutral density (ND) filter consisting of a base plate, multiple layers of high refractive index films, and multiple layers of low refractive index films, where the layers of high refractive index films and the layers low refractive index films are stacked layer by layer alternatively on the base plate. The base plate is a transparent plastic board, preferably made of polyethylene terephthalate (PET). Each high refractive index film is an iron-nickel-chromium alloy film layer, where the contents of iron, nickel, and chromium in each iron-nickel-chromium film layer are ≤ 1 percent, ≥ 75 percent, and ≤ 19.2 percent, respectively, and each low refractive index film is a silicon dioxide film layer. The ND filter's center wavelength is 500 nanometers and its film layer structure can be represented as (HL)^4, where H represents the high refractive index films and L represents the low refractive index films.
TW94117141A 2005-05-25 2005-05-25 Neutral density filter TWI274192B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94117141A TWI274192B (en) 2005-05-25 2005-05-25 Neutral density filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94117141A TWI274192B (en) 2005-05-25 2005-05-25 Neutral density filter

Publications (2)

Publication Number Publication Date
TW200641408A true TW200641408A (en) 2006-12-01
TWI274192B TWI274192B (en) 2007-02-21

Family

ID=38623083

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94117141A TWI274192B (en) 2005-05-25 2005-05-25 Neutral density filter

Country Status (1)

Country Link
TW (1) TWI274192B (en)

Also Published As

Publication number Publication date
TWI274192B (en) 2007-02-21

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees