JPS5698081A - Focus compensating circuit - Google Patents
Focus compensating circuitInfo
- Publication number
- JPS5698081A JPS5698081A JP27180A JP27180A JPS5698081A JP S5698081 A JPS5698081 A JP S5698081A JP 27180 A JP27180 A JP 27180A JP 27180 A JP27180 A JP 27180A JP S5698081 A JPS5698081 A JP S5698081A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- signal
- crt
- transformer
- supplied
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/26—Modifications of scanning arrangements to improve focusing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
PURPOSE:To ensure a sufficient in-focus state over the entire screen even with such CRT that has a large-size fluorescent screen and a large angle of deflection, by controllig the in-focus state of the CRT in accordance with the deflecting action. CONSTITUTION:The horizontal blanking pulse signal (a) is supplied to the base of the transistor TR10 from the blanking circuit 12, and thus a conduction is secured every time the TR10 becomes positive to flow the current to the primary coil of the transformer 6. The saw-tooth wave signal (b) is obtained at the secondary coil by the ON/OFF of the TR10 and the current flowing to the capacitor 9. This signal (b) is integrated and the parabola wave signal (c) obtained at the secondary coil of the transformer 3 is supplied to the focus voltage extracting terminal 2 of the FBT1. The DC voltage of the terminal 2 is connected to the focus electrode of the CRT to perform the focusing. Thus the out-of-focus due to the change of horizontal angle of defection is improved by piling the signal (c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27180A JPS5698081A (en) | 1980-01-08 | 1980-01-08 | Focus compensating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27180A JPS5698081A (en) | 1980-01-08 | 1980-01-08 | Focus compensating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5698081A true JPS5698081A (en) | 1981-08-07 |
Family
ID=11469235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27180A Pending JPS5698081A (en) | 1980-01-08 | 1980-01-08 | Focus compensating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5698081A (en) |
-
1980
- 1980-01-08 JP JP27180A patent/JPS5698081A/en active Pending
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