JPS5677809A - Preventing device for internal reflection of zoom lens - Google Patents

Preventing device for internal reflection of zoom lens

Info

Publication number
JPS5677809A
JPS5677809A JP15389379A JP15389379A JPS5677809A JP S5677809 A JPS5677809 A JP S5677809A JP 15389379 A JP15389379 A JP 15389379A JP 15389379 A JP15389379 A JP 15389379A JP S5677809 A JPS5677809 A JP S5677809A
Authority
JP
Japan
Prior art keywords
frame
lens
focal
spring
harmful
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
JP15389379A
Other languages
Japanese (ja)
Inventor
Yukio Fujii
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 JP15389379A priority Critical patent/JPS5677809A/en
Publication of JPS5677809A publication Critical patent/JPS5677809A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable a simple constitution to prevent harmful reflection from the inner surface of a lens barrel even during long-focal-length setting, by moving a shielding wall by prescribed extent by the elastic force of a spring, etc., according to the movement of the frame of a movable lens for variation in magnitude.
CONSTITUTION: As movable lens 2 for magnification variation 2 supported on frame 3 is moved backward in the direction of the optical axis by moving lens frame 3 for long-focal-length setting, shielding plate 8 to be released from being engaged with frame 3 moves backward along guide groove 9 by prescribed extent by the pressing force of spring 10. This simple constitution cuts securely harmful reflected light from the lens barrel inner surface through shielding plate 8, so that harmful reflection will be prevented.
COPYRIGHT: (C)1981,JPO&Japio
JP15389379A 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens Pending JPS5677809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15389379A JPS5677809A (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
JP15389379A JPS5677809A (en) 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens

Publications (1)

Publication Number Publication Date
JPS5677809A true JPS5677809A (en) 1981-06-26

Family

ID=15572408

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15389379A Pending JPS5677809A (en) 1979-11-28 1979-11-28 Preventing device for internal reflection of zoom lens

Country Status (1)

Country Link
JP (1) JPS5677809A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933285A (en) * 1996-04-17 1999-08-03 Olympus Optical Co., Ltd. Lens barrel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933285A (en) * 1996-04-17 1999-08-03 Olympus Optical Co., Ltd. Lens barrel

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