JPS55115020A - Automatic focus detector - Google Patents
Automatic focus detectorInfo
- Publication number
- JPS55115020A JPS55115020A JP2268879A JP2268879A JPS55115020A JP S55115020 A JPS55115020 A JP S55115020A JP 2268879 A JP2268879 A JP 2268879A JP 2268879 A JP2268879 A JP 2268879A JP S55115020 A JPS55115020 A JP S55115020A
- Authority
- JP
- Japan
- Prior art keywords
- focusing
- shift amount
- outputted
- phase difference
- allowable shift
- 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
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To achieve better conveniences of use by making focusing accuracy variable.
CONSTITUTION: The allowable shift amount Kx for focusing ranges RF1, RF2 at respective F-numbers is determined. The absolute value |k| of the output phase difference k of a photo sensor is compared with the allowable shift amount Kx and if the absolute value |k| is equal to or smaller than the allowable shift amount Kx, the phase difference k is within the focusing range and therefore the focusing signal is outputted. If the phase difference k is smaller than the allowable shift amount -Kx, the rear-focus signal is outputted and if k>-Kx, the front-focus signal is outputted. Thereby, the focusing accuracy may be changed according to F- numbers and the device becomes easier to use.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2268879A JPS5928886B2 (en) | 1979-02-28 | 1979-02-28 | automatic focus detection device |
DE3006244A DE3006244C2 (en) | 1979-02-20 | 1980-02-20 | Device for determining the focus of a lens on an object |
US06/122,999 US4373791A (en) | 1979-02-20 | 1980-02-20 | Focusing position detection apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2268879A JPS5928886B2 (en) | 1979-02-28 | 1979-02-28 | automatic focus detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55115020A true JPS55115020A (en) | 1980-09-04 |
JPS5928886B2 JPS5928886B2 (en) | 1984-07-17 |
Family
ID=12089803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2268879A Expired JPS5928886B2 (en) | 1979-02-20 | 1979-02-28 | automatic focus detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5928886B2 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59165012A (en) * | 1983-03-11 | 1984-09-18 | Fuji Photo Optical Co Ltd | Auto-focusing detector |
JPS62204247A (en) * | 1986-03-05 | 1987-09-08 | Canon Inc | Finder device camera or the like |
WO1991011742A1 (en) * | 1990-01-30 | 1991-08-08 | Nikon Corporation | Focus detecting device |
US5422701A (en) * | 1990-01-30 | 1995-06-06 | Nikon Corporation | Focus detection apparatus |
JPH0854560A (en) * | 1995-03-03 | 1996-02-27 | Nikon Corp | Automatic focus detector |
JPH0990204A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
JPH0990207A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
JPH0990205A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
EP1887399A1 (en) * | 2005-05-30 | 2008-02-13 | Nikon Corporation | Image formation state detection device |
EP1975663A1 (en) | 2007-03-28 | 2008-10-01 | Nikon Corporation | Light detection device, focus detection device, imaging apparatus, method of producing light detection device, and method of detecting focus |
-
1979
- 1979-02-28 JP JP2268879A patent/JPS5928886B2/en not_active Expired
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59165012A (en) * | 1983-03-11 | 1984-09-18 | Fuji Photo Optical Co Ltd | Auto-focusing detector |
JPS62204247A (en) * | 1986-03-05 | 1987-09-08 | Canon Inc | Finder device camera or the like |
JPH06105335B2 (en) * | 1986-03-05 | 1994-12-21 | キヤノン株式会社 | Finder devices such as cameras |
WO1991011742A1 (en) * | 1990-01-30 | 1991-08-08 | Nikon Corporation | Focus detecting device |
US5422701A (en) * | 1990-01-30 | 1995-06-06 | Nikon Corporation | Focus detection apparatus |
JPH0854560A (en) * | 1995-03-03 | 1996-02-27 | Nikon Corp | Automatic focus detector |
JPH0990204A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
JPH0990207A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
JPH0990205A (en) * | 1996-03-25 | 1997-04-04 | Minolta Co Ltd | Automatic focusing device |
EP1887399A1 (en) * | 2005-05-30 | 2008-02-13 | Nikon Corporation | Image formation state detection device |
EP1887399A4 (en) * | 2005-05-30 | 2011-03-23 | Nikon Corp | Image formation state detection device |
EP1975663A1 (en) | 2007-03-28 | 2008-10-01 | Nikon Corporation | Light detection device, focus detection device, imaging apparatus, method of producing light detection device, and method of detecting focus |
US7847226B2 (en) | 2007-03-28 | 2010-12-07 | Nikon Corporation | Focus detection device and method with honeycomb lens array and imaging device |
Also Published As
Publication number | Publication date |
---|---|
JPS5928886B2 (en) | 1984-07-17 |
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