JPS6427385A - Focus switching adjusting circuit - Google Patents

Focus switching adjusting circuit

Info

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
Application number
JP62184023A
Other languages
Japanese (ja)
Other versions
JP2605289B2 (en
Inventor
Tsutomu Nishida
Masahiro Kawashima
Kazuyasu Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62184023A priority Critical patent/JP2605289B2/en
Priority to KR1019880014151A priority patent/KR920003730B1/en
Publication of JPS6427385A publication Critical patent/JPS6427385A/en
Application granted granted Critical
Publication of JP2605289B2 publication Critical patent/JP2605289B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62184023A 1987-07-23 1987-07-23 Focus switching adjustment circuit Expired - Lifetime JP2605289B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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