JPS5677810A - Preventing device for internal reflection of zoom lens - Google Patents

Preventing device for internal reflection of zoom lens

Info

Publication number
JPS5677810A
JPS5677810A JP15389479A JP15389479A JPS5677810A JP S5677810 A JPS5677810 A JP S5677810A JP 15389479 A JP15389479 A JP 15389479A JP 15389479 A JP15389479 A JP 15389479A JP S5677810 A JPS5677810 A JP S5677810A
Authority
JP
Japan
Prior art keywords
wall
frame
lens
harmful
internal reflection
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
JP15389479A
Other languages
Japanese (ja)
Inventor
Yukio Fujii
Saburo Hokari
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15389479A priority Critical patent/JPS5677810A/en
Publication of JPS5677810A publication Critical patent/JPS5677810A/en
Pending legal-status Critical Current

Links

Landscapes

  • Mounting And Adjusting Of Optical Elements (AREA)
  • Lens Barrels (AREA)

Abstract

PURPOSE: To enable a simple constitution to prevent harmful internal reflection securely, by positioning a shielding wall by controlling two-way linear movement by a movable lens frame for magnification variation, tension spring, etc.
CONSTITUTION: As a long focal length is set by moving back movable lens 4 for magnitude variation along the optical axis through lens frame 4a, the lens is released from being engaged with frame 4a of shielding wall 9 positioned by being pushed forth to frame 4a during short-focus setting. Thus, wall 9 is moved back by the elastic force of tension spring 11 linked to leg part 10 in the same body with wall 9 and positioned at the corresponding place when a long focus is set. The simple constitution that does not require any cam, etc., cuts securely harmful reflected light from the inner lens barrel surface by wall 9, so that the harmful interval reflection can be prevented.
COPYRIGHT: (C)1981,JPO&Japio
JP15389479A 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens Pending JPS5677810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15389479A JPS5677810A (en) 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15389479A JPS5677810A (en) 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens

Publications (1)

Publication Number Publication Date
JPS5677810A true JPS5677810A (en) 1981-06-26

Family

ID=15572429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15389479A Pending JPS5677810A (en) 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens

Country Status (1)

Country Link
JP (1) JPS5677810A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5973722U (en) * 1982-11-06 1984-05-18 キヤノン株式会社 Moving aperture of zoom lens
JPS61140312U (en) * 1985-02-21 1986-08-30
US5313329A (en) * 1987-08-21 1994-05-17 Asahi Kogaku Kogyo Kabushiki Kaisha Lens hood assembly for zoom lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5973722U (en) * 1982-11-06 1984-05-18 キヤノン株式会社 Moving aperture of zoom lens
JPS61140312U (en) * 1985-02-21 1986-08-30
US5313329A (en) * 1987-08-21 1994-05-17 Asahi Kogaku Kogyo Kabushiki Kaisha Lens hood assembly for zoom lens

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