JPS5677810A - Preventing device for internal reflection of zoom lens - Google Patents
Preventing device for internal reflection of zoom lensInfo
- 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
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
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)
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 |
-
1979
- 1979-11-28 JP JP15389479A patent/JPS5677810A/en active Pending
Cited By (3)
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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