JPS5474423A - Focal point detecting circuit - Google Patents
Focal point detecting circuitInfo
- Publication number
- JPS5474423A JPS5474423A JP14174877A JP14174877A JPS5474423A JP S5474423 A JPS5474423 A JP S5474423A JP 14174877 A JP14174877 A JP 14174877A JP 14174877 A JP14174877 A JP 14174877A JP S5474423 A JPS5474423 A JP S5474423A
- Authority
- JP
- Japan
- Prior art keywords
- detecting
- detecting element
- image
- focal point
- cells
- 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 make it possible to accurately detect the focal point of an object of any size by using a detecting element of large area having a small detecting cell.
CONSTITUTION: The image signals having passed through an objective lens 21 are reflected by a half-mirror to reach an image detecting element 23. A monolithic photodiode, MOS photoelectric element or CCD photoelectric detecting element is used as the image detecting element 23. When the real image of the object is to be focused by the objective lens 21 upon the image detecting element 23, it is possible to generate the signals which have their optical contrast highly varied. If the respective cells of the detecting element 23 are made sufficiently small and if the output signals of the adjacent detecting cells are compared, there is a case, in which a remarkably difference resides in the output signal intensities of the two adjacent detecting cells. The output signals of the detecting cells 31 to 33 are compared so that the correct focal point is formed on the object at any distnace.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14174877A JPS5474423A (en) | 1977-11-26 | 1977-11-26 | Focal point detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14174877A JPS5474423A (en) | 1977-11-26 | 1977-11-26 | Focal point detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5474423A true JPS5474423A (en) | 1979-06-14 |
Family
ID=15299271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14174877A Pending JPS5474423A (en) | 1977-11-26 | 1977-11-26 | Focal point detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5474423A (en) |
-
1977
- 1977-11-26 JP JP14174877A patent/JPS5474423A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS57161708A (en) | Focusing detector having variable visual field of detection | |
JPS53110823A (en) | Optical information processor | |
JPS57158820A (en) | Method for focusing detection | |
JPS5675607A (en) | Automatic focus detecting device | |
JPS5598709A (en) | Focusing detector | |
JPS5295221A (en) | Detector for focusing | |
JPS5518652A (en) | Imaging state detecting system of image | |
JPS57204504A (en) | Photodetection part of focus detector | |
JPS5589819A (en) | Focus detector of camera | |
JPS55111926A (en) | Automatic focus detector | |
JPS5474423A (en) | Focal point detecting circuit | |
JPS55106421A (en) | Focusing detector | |
JPS5629112A (en) | Distance measurement unit | |
JPS55106442A (en) | Blur detector | |
JPS5541432A (en) | Focus detector | |
JPS5535317A (en) | Focus detector of camera | |
JPS5686357A (en) | Direction detector | |
JPS54116922A (en) | Focal point detector | |
JPS55124007A (en) | Light angle detector | |
JPS5574403A (en) | Light position detector | |
JPS56153307A (en) | Focusing detecting method | |
JPS5511606A (en) | Photoelectric conversion device | |
JPS546532A (en) | Detecting method of focusing positions by chromatic aberrations of lens | |
JPS5521685A (en) | Solidstate pick up unit | |
JPS55143512A (en) | Focus detector |