JPS6427385A - Focus switching adjusting circuit - Google Patents
Focus switching adjusting circuitInfo
- Publication number
- JPS6427385A JPS6427385A JP62184023A JP18402387A JPS6427385A JP S6427385 A JPS6427385 A JP S6427385A JP 62184023 A JP62184023 A JP 62184023A JP 18402387 A JP18402387 A JP 18402387A JP S6427385 A JPS6427385 A JP S6427385A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- signal
- switching
- adjustment
- mode
- 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 simplify the white balance adjustment and lens focus adjustment by interlocking a means setting separately the two modes, just focus mode and overfocus mode, a switch switching both the modes and a switch switching a built-in cross hatch signal and an external video signal. CONSTITUTION:In displaying an internal cross hatch signal at first by a signal changeover switch 4, since the focus switching adjustment circuit is selected to be in the A mode, an electric focus variable resistor 5 is adjusted to set the state into the just focus state. Then a projecting lens for blue CRT is turned in this state to optimize the lens focus. In switching the signal changeover switch 4 to the position of the video signal, since the focus changeover adjusting circuit is in the B mode, the electric focus variable resistor 6 is adjusted to optimize the white balance. Thus, the projective lens focus adjustment at the re-installation is applied by switching the video signal to an internal cross hatch signal so as to have only to adjust the lens focus thereby offering ease of focus adjustment.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62184023A JP2605289B2 (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 |
---|---|---|---|
JP62184023A JP2605289B2 (en) | 1987-07-23 | 1987-07-23 | Focus switching adjustment circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6427385A true JPS6427385A (en) | 1989-01-30 |
JP2605289B2 JP2605289B2 (en) | 1997-04-30 |
Family
ID=16145992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62184023A Expired - Lifetime JP2605289B2 (en) | 1987-07-23 | 1987-07-23 | Focus switching adjustment circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2605289B2 (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 JP62184023A patent/JP2605289B2/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 |
---|---|
JP2605289B2 (en) | 1997-04-30 |
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