JPS54134427A - Focusing device - Google Patents
Focusing deviceInfo
- Publication number
- JPS54134427A JPS54134427A JP4201078A JP4201078A JPS54134427A JP S54134427 A JPS54134427 A JP S54134427A JP 4201078 A JP4201078 A JP 4201078A JP 4201078 A JP4201078 A JP 4201078A JP S54134427 A JPS54134427 A JP S54134427A
- Authority
- JP
- Japan
- Prior art keywords
- light
- lens
- focusing lens
- incident
- iris
- 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
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To improve the detecting accuracy by using a conical prism.
CONSTITUTION: There is arranged on the optical axis 4 of a focusing lens 2 which is arranged in parallel with the optical axis 3 of an objective lens 1 such a trigonal, pyramid and conical prism 5 as has its apex angle larger than twice of the complementary angle of the critical angle for the total reflection thereby to be free from any total reflection. And, the light incident upon the lens 1 is focused upon a light receiving element 8 through an iris 9 and a focusing lens 9, and the light incident upon the lens 2 is forcused upon a light receiving element 7 through the prism 5, an iris 6 and a focusing lens 11. The received guantities of light are fed through a differential amplifier 12 to a light emitting display device 13. When the difference inbetween becomes zero, the display device 13 is operated to display the focused condition. Thus, a sufficient quantity of light is incident upon the elements 7 and 8 thereby to attain the desired objects.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4201078A JPS54134427A (en) | 1978-04-10 | 1978-04-10 | Focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4201078A JPS54134427A (en) | 1978-04-10 | 1978-04-10 | Focusing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54134427A true JPS54134427A (en) | 1979-10-18 |
Family
ID=12624204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4201078A Pending JPS54134427A (en) | 1978-04-10 | 1978-04-10 | Focusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54134427A (en) |
-
1978
- 1978-04-10 JP JP4201078A patent/JPS54134427A/en active Pending
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