JPS5654416A - Automatic focusing device of camera - Google Patents
Automatic focusing device of cameraInfo
- Publication number
- JPS5654416A JPS5654416A JP13081579A JP13081579A JPS5654416A JP S5654416 A JPS5654416 A JP S5654416A JP 13081579 A JP13081579 A JP 13081579A JP 13081579 A JP13081579 A JP 13081579A JP S5654416 A JPS5654416 A JP S5654416A
- Authority
- JP
- Japan
- Prior art keywords
- helicoid
- depth
- value
- field
- 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.)
- Granted
Links
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To make controlling simple and obtain good images by detecting the focal length and aperture value of a camera by detecting means, calculating the depth of field from the values thereof, limiting the extending amount of a helicoid according to said value and stopping the helicoid in a predetermined position when the depth is larger than a fixed value.
CONSTITUTION: The camera automatic focusing device is provided with a focal length detector 1, an aperture value detector 2, a helicoid position detector 3, a helicoid driving motor 4, etc. Aperture value and focal length are detected with the detectors 1 and 2 respectively and the depth of field is calculated with a depth of field calculating circuit 5. When the value thereof is smaller than the depth of field critical value A common to the shortest subject distance and an infinite subject distance, the helicoid is driven according to said depth value by way of a helicoid lower limit limiting circuit 6 and upper limit limiting circuit 7, a motor driving circuit 8 and the helicoid driving motor 4. If it is larger than A, a distance measuring device 9 is stopped to fix the helicoid and fix the focus. Thereby, the controlling may be made simple and the image free from out-of-focus may be obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13081579A JPS5654416A (en) | 1979-10-12 | 1979-10-12 | Automatic focusing device of camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13081579A JPS5654416A (en) | 1979-10-12 | 1979-10-12 | Automatic focusing device of camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5654416A true JPS5654416A (en) | 1981-05-14 |
| JPS6223851B2 JPS6223851B2 (en) | 1987-05-26 |
Family
ID=15043352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13081579A Granted JPS5654416A (en) | 1979-10-12 | 1979-10-12 | Automatic focusing device of camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5654416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378932U (en) * | 1986-11-11 | 1988-05-25 | ||
| JP2008046224A (en) * | 2006-08-11 | 2008-02-28 | Canon Inc | Lens device for imaging apparatus and imaging apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114891A (en) * | 1974-07-27 | 1976-02-05 | Toyota Motor Co Ltd | Shokubaino seizoho |
| JPS5436929A (en) * | 1977-08-29 | 1979-03-19 | Fuji Photo Optical Co Ltd | Camera with automatic focus device |
-
1979
- 1979-10-12 JP JP13081579A patent/JPS5654416A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114891A (en) * | 1974-07-27 | 1976-02-05 | Toyota Motor Co Ltd | Shokubaino seizoho |
| JPS5436929A (en) * | 1977-08-29 | 1979-03-19 | Fuji Photo Optical Co Ltd | Camera with automatic focus device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378932U (en) * | 1986-11-11 | 1988-05-25 | ||
| JP2008046224A (en) * | 2006-08-11 | 2008-02-28 | Canon Inc | Lens device for imaging apparatus and imaging apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6223851B2 (en) | 1987-05-26 |
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