JPS6433513A - Wide angle photographing lens - Google Patents
Wide angle photographing lensInfo
- Publication number
- JPS6433513A JPS6433513A JP62189386A JP18938687A JPS6433513A JP S6433513 A JPS6433513 A JP S6433513A JP 62189386 A JP62189386 A JP 62189386A JP 18938687 A JP18938687 A JP 18938687A JP S6433513 A JPS6433513 A JP S6433513A
- Authority
- JP
- Japan
- Prior art keywords
- lenses
- planes
- constitution
- object sides
- aspherical
- 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.)
- Granted
Links
Landscapes
- Lenses (AREA)
Abstract
PURPOSE:To suppress focus travel for temperature change as attaining cost reduction, by employing plastic lenses as third and fifth lenses out of 5-group/5- piece constitution, and forming planes on object sides as aspherical, respectively. CONSTITUTION:The titled lens is constituted in such a way that the 5-group/5- piece constitution is employed and the plastic lenses are used as third and fifth lenses and the planes of those lenses on the object sides are formed as aspherical. Furthermore, assuming the focal distance of first and fourth lenses as f1 and f4, the cone constant of the third lens as K3, a telephoto ratio as TH, the refractive indexes of the first and fourth lenses as N1 and N7, the radii of curvature of the planes on the object sides of the first and second lenses as R1 and R3, and an air interval between the third and fourth lenses as (d), inequalities 1-4 are satisfied. In such a way, it is possible to attain the cost reduction, and to suppress the focus travel due to the temperature change and the fluctuation of aberration at minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62189386A JPH06100721B2 (en) | 1987-07-29 | 1987-07-29 | Wide angle photographic lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62189386A JPH06100721B2 (en) | 1987-07-29 | 1987-07-29 | Wide angle photographic lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6433513A true JPS6433513A (en) | 1989-02-03 |
| JPH06100721B2 JPH06100721B2 (en) | 1994-12-12 |
Family
ID=16240444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62189386A Expired - Lifetime JPH06100721B2 (en) | 1987-07-29 | 1987-07-29 | Wide angle photographic lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06100721B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013101402A (en) * | 2013-02-20 | 2013-05-23 | Olympus Corp | Imaging optical system and imaging apparatus including the same |
| JP2013109374A (en) * | 2013-02-20 | 2013-06-06 | Olympus Corp | Imaging optical system and imaging apparatus with the same |
| US8976462B2 (en) | 2009-02-25 | 2015-03-10 | Olympus Corporation | Image pickup optical system and image pickup apparatus using the same |
-
1987
- 1987-07-29 JP JP62189386A patent/JPH06100721B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8976462B2 (en) | 2009-02-25 | 2015-03-10 | Olympus Corporation | Image pickup optical system and image pickup apparatus using the same |
| JP2013101402A (en) * | 2013-02-20 | 2013-05-23 | Olympus Corp | Imaging optical system and imaging apparatus including the same |
| JP2013109374A (en) * | 2013-02-20 | 2013-06-06 | Olympus Corp | Imaging optical system and imaging apparatus with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06100721B2 (en) | 1994-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071212 Year of fee payment: 13 |