JPS554023A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS554023A JPS554023A JP7612578A JP7612578A JPS554023A JP S554023 A JPS554023 A JP S554023A JP 7612578 A JP7612578 A JP 7612578A JP 7612578 A JP7612578 A JP 7612578A JP S554023 A JPS554023 A JP S554023A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- pin
- object side
- moving
- focal length
- 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
- Lens Barrels (AREA)
- Lenses (AREA)
Abstract
PURPOSE: To expand the existing movable focal length range by so constituting the zoom lens that the spacing of moving lens groups is changed and that the means of defining the positions of the moving lens groups during zooming is changed to the other position defining means.
CONSTITUTION: When a tuning ring 24 is turned in the case of additionally expanding the existing variable focal length region, a driving pin 22 and extending pin 23 are pushed out to the object side by the actuation a linear cam groove 10d and cam grooves 25a, 25b which define the movement quantity. This causes the outer barrel 15 engaging to the pin 22 to slide to the object side and at the same time the cam pin 21 of the lens group III to move to the object side, so that it is nipped by the other curving sides 18a and 19b of the cam opening. In addition, since the pin 23 causes the moving barrel 11 to slide to the object side by the specified quantity, the gear 27 moves to a revolving shaft 30. Hence, a cam barrel 13 and combined cam barrels 14, 15 are rotated by a driving device 31, and the lens group III is moved on the moving curve separate from that of the lens group II, whereby the range of focal length is additionally expanded.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7612578A JPS554023A (en) | 1978-06-23 | 1978-06-23 | Zoom lens |
US06/049,165 US4256371A (en) | 1978-06-23 | 1979-06-18 | Zoom lens with extended variable focal length range |
DE19792925355 DE2925355A1 (en) | 1978-06-23 | 1979-06-22 | VARIO LENS SYSTEM |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7612578A JPS554023A (en) | 1978-06-23 | 1978-06-23 | Zoom lens |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS554023A true JPS554023A (en) | 1980-01-12 |
Family
ID=13596194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7612578A Pending JPS554023A (en) | 1978-06-23 | 1978-06-23 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS554023A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055819A (en) * | 1991-06-27 | 1993-01-14 | Canon Inc | Zoom lens barrel |
-
1978
- 1978-06-23 JP JP7612578A patent/JPS554023A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH055819A (en) * | 1991-06-27 | 1993-01-14 | Canon Inc | Zoom lens barrel |
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