JPS5677809A - Preventing device for internal reflection of zoom lens - Google Patents
Preventing device for internal reflection of zoom lensInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5933285A (en) * | 1996-04-17 | 1999-08-03 | Olympus Optical Co., Ltd. | Lens barrel |
-
1979
- 1979-11-28 JP JP15389379A patent/JPS5677809A/en active Pending
Cited By (1)
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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