JPS6472119A - Optical low-pass filter - Google Patents
Optical low-pass filterInfo
- Publication number
- JPS6472119A JPS6472119A JP22773087A JP22773087A JPS6472119A JP S6472119 A JPS6472119 A JP S6472119A JP 22773087 A JP22773087 A JP 22773087A JP 22773087 A JP22773087 A JP 22773087A JP S6472119 A JPS6472119 A JP S6472119A
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- diffraction
- diffraction gratings
- differ
- liquid crystal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
Abstract
PURPOSE:To display the best low-pass effect corresponding to the stop diameter of the stop system of a photographic lens by controlling the application of a voltage to liquid crystal sandwiched between two diffraction gratings which are in a specific shape such as a triangular-wave shape and a rectangular shape and differ in pitch and using the diffraction gratings properly according to the stop system. CONSTITUTION:The opposite surfaces of two transparent bodies 1 and 5 which differ in refractive index are formed of the phase type diffraction gratings which differ in pitch and is in the specific shape, and the liquid crystal 3 is charged between the two transparent bodies 1 and 5. Then the refractive index of the liquid crystal 3 is controlled to vary the diffraction pitch of the diffraction grating to passing luminous flux substantially. Consequently, when a diffracted image is put out of focus by making the diffraction pitch of the diffraction gratings as rough as possible, the desired low-pass effect is obtained even on a small-aperture side and a decrease in the picture quantity of the diffracted image is suppressed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22773087A JPS6472119A (en) | 1987-09-11 | 1987-09-11 | Optical low-pass filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22773087A JPS6472119A (en) | 1987-09-11 | 1987-09-11 | Optical low-pass filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6472119A true JPS6472119A (en) | 1989-03-17 |
Family
ID=16865458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22773087A Pending JPS6472119A (en) | 1987-09-11 | 1987-09-11 | Optical low-pass filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6472119A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5434709A (en) * | 1992-08-05 | 1995-07-18 | Matsushita Electric Industrial Co., Ltd. | Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers |
WO2007083783A1 (en) * | 2006-01-20 | 2007-07-26 | Acutelogic Corporation | Optical low pass filter and imaging device using the same |
JP2012225958A (en) * | 2011-04-14 | 2012-11-15 | Asahi Glass Co Ltd | Optical low-pass filter and imaging apparatus |
WO2016056251A1 (en) * | 2014-10-08 | 2016-04-14 | オリンパス株式会社 | Image-forming optical system, illumination device, and observation device |
-
1987
- 1987-09-11 JP JP22773087A patent/JPS6472119A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5434709A (en) * | 1992-08-05 | 1995-07-18 | Matsushita Electric Industrial Co., Ltd. | Wavelength-selective phase grating type optical low-pass filter comprising adhesive layer between transparent layers |
WO2007083783A1 (en) * | 2006-01-20 | 2007-07-26 | Acutelogic Corporation | Optical low pass filter and imaging device using the same |
JP2012225958A (en) * | 2011-04-14 | 2012-11-15 | Asahi Glass Co Ltd | Optical low-pass filter and imaging apparatus |
WO2016056251A1 (en) * | 2014-10-08 | 2016-04-14 | オリンパス株式会社 | Image-forming optical system, illumination device, and observation device |
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