JPS5587115A - Focus detector - Google Patents
Focus detectorInfo
- Publication number
- JPS5587115A JPS5587115A JP16415378A JP16415378A JPS5587115A JP S5587115 A JPS5587115 A JP S5587115A JP 16415378 A JP16415378 A JP 16415378A JP 16415378 A JP16415378 A JP 16415378A JP S5587115 A JPS5587115 A JP S5587115A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- photo detector
- focus
- auxiliary lens
- image
- 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
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To improve focus detection accuracy by so constituting the device that a photo detecting element and the subject are positioned in a conjugate or equivalent relation.
CONSTITUTION: A photographing lens 5, split image prism 6, auxiliary lens 7 and photo detector 8 are arrayed in a coaxial relation and the focal plane SS' of the prism 6 are in the positions optically equivalent to the film plane. The auxiliary lens 7 is movable on the optical axis and the photo detector 8 is constituted by the two portions 8A, 8B sandwiching the straight line EE' parallel with the boundary line of the prism 6. Now, when the subject image is formed on the focal plane SS', the split image prism 6 does not move the image to the two portions of P1 and P2 and therefore the movement amount d of the images P1', P2' on the photo detector 8 becomes 0 and this point is a focus. At the same time, the photo detector 8 and auxiliary lens 7 has the function as a contrast detection type focus detector as well and therefore the focus detection accuracy may be improved.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16415378A JPS5587115A (en) | 1978-12-25 | 1978-12-25 | Focus detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16415378A JPS5587115A (en) | 1978-12-25 | 1978-12-25 | Focus detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5587115A true JPS5587115A (en) | 1980-07-01 |
Family
ID=15787738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16415378A Pending JPS5587115A (en) | 1978-12-25 | 1978-12-25 | Focus detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5587115A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5897012A (en) * | 1981-12-07 | 1983-06-09 | Olympus Optical Co Ltd | Focus detector |
JPS5897011A (en) * | 1981-12-07 | 1983-06-09 | Olympus Optical Co Ltd | Focusing detecting method |
-
1978
- 1978-12-25 JP JP16415378A patent/JPS5587115A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5897012A (en) * | 1981-12-07 | 1983-06-09 | Olympus Optical Co Ltd | Focus detector |
JPS5897011A (en) * | 1981-12-07 | 1983-06-09 | Olympus Optical Co Ltd | Focusing detecting method |
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