JPS5548724A - Optical low-pass filter - Google Patents

Optical low-pass filter

Info

Publication number
JPS5548724A
JPS5548724A JP12174478A JP12174478A JPS5548724A JP S5548724 A JPS5548724 A JP S5548724A JP 12174478 A JP12174478 A JP 12174478A JP 12174478 A JP12174478 A JP 12174478A JP S5548724 A JPS5548724 A JP S5548724A
Authority
JP
Japan
Prior art keywords
diffraction grating
diffraction
diffracted light
pass filter
transparent member
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
Application number
JP12174478A
Other languages
Japanese (ja)
Inventor
Susumu Matsumura
Kazuya Matsumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP12174478A priority Critical patent/JPS5548724A/en
Publication of JPS5548724A publication Critical patent/JPS5548724A/en
Pending legal-status Critical Current

Links

Landscapes

  • Color Television Image Signal Generators (AREA)

Abstract

PURPOSE: To lower cost and enhance performance by using the diffraction grating having such diffraction characteristics that the most of the quantities of diffracted light concentrate at the certain two specific diffraction degrees.
CONSTITUTION: In the photographing optical system of color television consisting of a photographic lens system 10, diffraction grating 11, color stripe filter 12 and image pickup tube 13, the diffraction grating is made by the face shown by 14 of a transparent member 11. This diffraction grating comprises evaporating a transparent film such as of MgF2 on an optical transparent member 17 such as, e.g., glass or the like. The ray 15 incident to this diffraction grating is received diffraction action by the diffraction grating and is separated mainly to two luminous fluxes 16 of +1st order diffracted light and -1st order diffracted light. Hence, the imaging ray having passed through the lens separates to two luminous fluexes, by which the double images are formed. The use of such diffraction grating enables the inexpensive and high-performance low-pass filter to be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP12174478A 1978-10-03 1978-10-03 Optical low-pass filter Pending JPS5548724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12174478A JPS5548724A (en) 1978-10-03 1978-10-03 Optical low-pass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12174478A JPS5548724A (en) 1978-10-03 1978-10-03 Optical low-pass filter

Publications (1)

Publication Number Publication Date
JPS5548724A true JPS5548724A (en) 1980-04-08

Family

ID=14818796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12174478A Pending JPS5548724A (en) 1978-10-03 1978-10-03 Optical low-pass filter

Country Status (1)

Country Link
JP (1) JPS5548724A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895318A (en) * 1981-09-10 1983-06-06 エルゲ−ツエツト・ランデイス・ウント・ギ−ル・ツ−ク・アクチエンゲゼルシヤフト Optical authentisity checking mark for document

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4853741A (en) * 1971-10-08 1973-07-28
JPS4941688A (en) * 1972-08-28 1974-04-19

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4853741A (en) * 1971-10-08 1973-07-28
JPS4941688A (en) * 1972-08-28 1974-04-19

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895318A (en) * 1981-09-10 1983-06-06 エルゲ−ツエツト・ランデイス・ウント・ギ−ル・ツ−ク・アクチエンゲゼルシヤフト Optical authentisity checking mark for document
JPH0251315U (en) * 1981-09-10 1990-04-11
JPH0532827Y2 (en) * 1981-09-10 1993-08-23

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