JPS5624317A - Light chopper - Google Patents
Light chopperInfo
- Publication number
- JPS5624317A JPS5624317A JP10056479A JP10056479A JPS5624317A JP S5624317 A JPS5624317 A JP S5624317A JP 10056479 A JP10056479 A JP 10056479A JP 10056479 A JP10056479 A JP 10056479A JP S5624317 A JPS5624317 A JP S5624317A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light
- periodically
- photodetector
- lens
- 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
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Liquid Crystal (AREA)
Abstract
PURPOSE: To obviate the use of motors and rotary plates, miniaturize the chopper and reduce its driving power by periodically changing the reflectance or transmittance of light of a liquid crystal thereby entering the light into the crystal.
CONSTITUTION: Since a multivibrator 32 using an integrated circuit as a driving circuit is connected to a liquid crystal 31, the liquid crystal 31 periodically repeats a transparent state and an opaque state. On the other hand, a light signal 33 is led from an optical fiber 34 via a lens 35 into the liquid crystal 31; when the liquid crystal 31 is transparent, the light transmits through the liquid crystal 31 and when opaque, it is reflected by the liquid crystal surface and enters a photodetector 37 via a lens 36. This results in that at this time the light entering the photodetector 37 is periodically chopped.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10056479A JPS5624317A (en) | 1979-08-06 | 1979-08-06 | Light chopper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10056479A JPS5624317A (en) | 1979-08-06 | 1979-08-06 | Light chopper |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5624317A true JPS5624317A (en) | 1981-03-07 |
Family
ID=14277406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10056479A Pending JPS5624317A (en) | 1979-08-06 | 1979-08-06 | Light chopper |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5624317A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4600300A (en) * | 1983-02-14 | 1986-07-15 | Rotello Gregory A | Method and apparatus to determine frequency of movement and for visual inspection of moving objects |
JPS62170822A (en) * | 1986-01-24 | 1987-07-27 | Toray Ind Inc | Pyroelectric type photosensor |
JPS638724U (en) * | 1986-07-01 | 1988-01-21 | ||
JPH0564825U (en) * | 1992-02-03 | 1993-08-27 | 株式会社アドバンテスト | Optical sensor with optical chopper |
US6011614A (en) * | 1996-04-19 | 2000-01-04 | Lindmark; Curt | Instrument and method for measuring a periodic motion |
KR100670736B1 (en) * | 2004-06-17 | 2007-01-18 | 모딘코리아 유한회사 | Controlling Method of Air Filtering Apparatus for Air Conditioner of Vehicles |
-
1979
- 1979-08-06 JP JP10056479A patent/JPS5624317A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4600300A (en) * | 1983-02-14 | 1986-07-15 | Rotello Gregory A | Method and apparatus to determine frequency of movement and for visual inspection of moving objects |
JPS62170822A (en) * | 1986-01-24 | 1987-07-27 | Toray Ind Inc | Pyroelectric type photosensor |
JPS638724U (en) * | 1986-07-01 | 1988-01-21 | ||
JPH0564825U (en) * | 1992-02-03 | 1993-08-27 | 株式会社アドバンテスト | Optical sensor with optical chopper |
US6011614A (en) * | 1996-04-19 | 2000-01-04 | Lindmark; Curt | Instrument and method for measuring a periodic motion |
KR100670736B1 (en) * | 2004-06-17 | 2007-01-18 | 모딘코리아 유한회사 | Controlling Method of Air Filtering Apparatus for Air Conditioner of Vehicles |
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