JPS6427384A - Focus switching adjusting circuit - Google Patents

Focus switching adjusting circuit

Info

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
Application number
JP62184020A
Other languages
Japanese (ja)
Other versions
JP2605288B2 (en
Inventor
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 JP62184020A priority Critical patent/JP2605288B2/en
Priority to KR1019880014151A priority patent/KR920003730B1/en
Publication of JPS6427384A publication Critical patent/JPS6427384A/en
Application granted granted Critical
Publication of JP2605288B2 publication Critical patent/JP2605288B2/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 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.
JP62184020A 1987-07-23 1987-07-23 Focus switching adjustment circuit Expired - Lifetime JP2605288B2 (en)

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)

* 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
JP2605288B2 (en) 1997-04-30

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