JPS5616378A - Focal distance measuring device for projection-type cathode-ray tube - Google Patents

Focal distance measuring device for projection-type cathode-ray tube

Info

Publication number
JPS5616378A
JPS5616378A JP9243879A JP9243879A JPS5616378A JP S5616378 A JPS5616378 A JP S5616378A JP 9243879 A JP9243879 A JP 9243879A JP 9243879 A JP9243879 A JP 9243879A JP S5616378 A JPS5616378 A JP S5616378A
Authority
JP
Japan
Prior art keywords
projection
ray tube
type cathode
focal distance
measuring device
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
Application number
JP9243879A
Other languages
Japanese (ja)
Inventor
Takashi Sugawara
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9243879A priority Critical patent/JPS5616378A/en
Publication of JPS5616378A publication Critical patent/JPS5616378A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Details Of Television Systems (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To realize an easy measurement of the focal distance, by shielding slowly and in a fixed cycle the output light given from the projection-type cathode-ray tube by the gobo. CONSTITUTION:The output light given from projection-type cathode-ray tube 4 is shielded slowly and in a fixed cycle by gobo 8. As a result, the size of the spot image displayed on screen 6 can be converted into the shift amount of the spot image to facilitate an easy identification by the naked eyes. Then an adjustment is given to the distance between tube 4 and screen 6 to minimize the shift amount of the spot image. In this way, the focal distance can be measured for the projection- type cathode-ray tube.
JP9243879A 1979-07-18 1979-07-18 Focal distance measuring device for projection-type cathode-ray tube Pending JPS5616378A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9243879A JPS5616378A (en) 1979-07-18 1979-07-18 Focal distance measuring device for projection-type cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9243879A JPS5616378A (en) 1979-07-18 1979-07-18 Focal distance measuring device for projection-type cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS5616378A true JPS5616378A (en) 1981-02-17

Family

ID=14054426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9243879A Pending JPS5616378A (en) 1979-07-18 1979-07-18 Focal distance measuring device for projection-type cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS5616378A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598470A (en) * 1982-07-06 1984-01-17 Matsushita Electric Ind Co Ltd Color resolving optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598470A (en) * 1982-07-06 1984-01-17 Matsushita Electric Ind Co Ltd Color resolving optical system
JPS6328551B2 (en) * 1982-07-06 1988-06-08 Matsushita Electric Ind Co Ltd

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