JPS6427384A - Focus switching adjusting circuit - Google Patents
Focus switching adjusting circuitInfo
- Publication number
- JPS6427384A JPS6427384A JP62184020A JP18402087A JPS6427384A JP S6427384 A JPS6427384 A JP S6427384A JP 62184020 A JP62184020 A JP 62184020A JP 18402087 A JP18402087 A JP 18402087A JP S6427384 A JPS6427384 A JP S6427384A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- mode
- white balance
- adjustment
- electric
- 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
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
PURPOSE:To contrive to simplify the lens focus adjustment and the white balance adjustment by providing a means setting separately a focus current of an electromagnetic flux type cathode ray tube separately to the two modes and a means switching the 2 modes to designate any setting value so as to use a switch thereby switching the overfocus mode. CONSTITUTION:A mode changeover switch 3 is thrown to the mode A at the initial installation of the receiver and an electric focus variable resistor 1 is adjusted to vary the base voltage of a transistor(TR) of a differential amplifier 4. Then a current flowing to a blue static focus coil 5 is changed to set the electric focus of the blue CRT to the just focus state. The projecting lens for the blue CRT is turned to optimize the lens focus. Then the mode changeover switch 3 is thrown to the position of the mode B, the electric focus variable resistor 2 is adjusted to apply setting of overfocus surplus thereby optimizing the white balance. Thus, it is not required to conduct the white balance adjustment again for the projecting lens focus adjustment at the re-installation.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62184020A JP2605288B2 (en) | 1987-07-23 | 1987-07-23 | Focus switching adjustment circuit |
KR1019880014151A KR920003730B1 (en) | 1987-07-23 | 1988-10-29 | Forcus changing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62184020A JP2605288B2 (en) | 1987-07-23 | 1987-07-23 | Focus switching adjustment circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6427384A true JPS6427384A (en) | 1989-01-30 |
JP2605288B2 JP2605288B2 (en) | 1997-04-30 |
Family
ID=16145935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62184020A Expired - Lifetime JP2605288B2 (en) | 1987-07-23 | 1987-07-23 | Focus switching adjustment circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2605288B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5635993A (en) * | 1995-03-27 | 1997-06-03 | Nec Corporation | Apparatus and method for controlling white balance of a cathode ray tube projector |
-
1987
- 1987-07-23 JP JP62184020A patent/JP2605288B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5635993A (en) * | 1995-03-27 | 1997-06-03 | Nec Corporation | Apparatus and method for controlling white balance of a cathode ray tube projector |
Also Published As
Publication number | Publication date |
---|---|
JP2605288B2 (en) | 1997-04-30 |
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