JPS5490988A - Photo timer unit - Google Patents
Photo timer unitInfo
- Publication number
- JPS5490988A JPS5490988A JP15993377A JP15993377A JPS5490988A JP S5490988 A JPS5490988 A JP S5490988A JP 15993377 A JP15993377 A JP 15993377A JP 15993377 A JP15993377 A JP 15993377A JP S5490988 A JPS5490988 A JP S5490988A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- degree
- film
- correction value
- tube voltage
- 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
- X-Ray Techniques (AREA)
Abstract
PURPOSE: To enable to control the degree of black of X-ray films accurately, by using the reciprocal of the rate of degree of black for film to the change in the X-ray tube voltage as correction value.
CONSTITUTION: When X-ray exposure is started, the tube voltage given to the X- ray tube 1 is obtained from the X-ray controller 2, and the correction value to the tube voltage is read out from the memory 11 memorizing the reciprocal of the rate of the degree of black for film to the change in the tube voltage as the correction value. This correction value is D/A converted 12 and is fed to the operation circuit 13. On the other hand, the X-rays are passed through the film, then they are converted into optical image, and the output of the photomultiplier 9 receiving a part of them is fed to the circuit 13. Further, the circuit 13 multiplies two inputs and outputs the corrected detection output. This value and the set value for the optimum blackeuing degree are compared 14, and the exposure of X-ray is stopped when the output of the comparator 14 reaches the set value. Thus, the blackening degree control can be accurately made for the X-ray film.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15993377A JPS5490988A (en) | 1977-12-27 | 1977-12-27 | Photo timer unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15993377A JPS5490988A (en) | 1977-12-27 | 1977-12-27 | Photo timer unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5490988A true JPS5490988A (en) | 1979-07-19 |
Family
ID=15704313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15993377A Pending JPS5490988A (en) | 1977-12-27 | 1977-12-27 | Photo timer unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5490988A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61288399A (en) * | 1985-06-17 | 1986-12-18 | Hitachi Medical Corp | Automatic x-ray exposure control device |
| JP2007532262A (en) * | 2004-04-15 | 2007-11-15 | ウィルソン−クック・メディカル・インコーポレーテッド | Endoscopic surgical access instrument and method for articulating an external accessory channel |
-
1977
- 1977-12-27 JP JP15993377A patent/JPS5490988A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61288399A (en) * | 1985-06-17 | 1986-12-18 | Hitachi Medical Corp | Automatic x-ray exposure control device |
| JP2007532262A (en) * | 2004-04-15 | 2007-11-15 | ウィルソン−クック・メディカル・インコーポレーテッド | Endoscopic surgical access instrument and method for articulating an external accessory channel |
| JP4923231B2 (en) * | 2004-04-15 | 2012-04-25 | クック メディカル テクノロジーズ エルエルシー | Endoscopic surgical access instrument and method for articulating an external accessory channel |
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