K-G1 electrode spacing system for a CRT electron gun
AssigneeZenith Electronics Corporation
InventorChester L. Zdanowski
Life of this patent
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Abstract
A K-G1 spacing apparatus provides for spacing the dispenser cathode of a CRT electron gun a desired distance from an adjacent apertured grid electrode known as "G1." A probe has an outer shaft with a shoulder for registering with the G1 electrode. The probe includes an inner shaft having a tip on one end for contacting the face of the cathode, and at the opposite end, a linear velocity differential transformer (LVDT). When the cathode contacts the tip of the probe, the LVDT produces an electrical signal which is indicated on a calibrated column, and which denotes the location of the cathode face relative to the G1 electrode. When the desired K-G1 spacing has been attained, the cathode is fixed in permanent relationship with the G1 electrode.
Claims20
An apparatus for spacing a dispenser cathode in a cathode eyelet of a beaded assembly of a CRT electron gun at a fixed distance from an adjacent apertured grid electrode in the beaded assembly comprising:
- a) means for holding the beaded assembly over a probe;
- b) the probe constructed and arranged to pass through the apertures of the beaded assembly, the probe including:
- 1) an outer shaft having a shoulder for contacting a registration surface of the adjacent electrode, and
- 2) an inner shaft movable within and extensible from the outer shaft and having a tip sized to pass through the aperture of the adjacent electrode;
- c) means for extending the inner shaft a predetermined distance from the outer shaft shoulder;
- d) metrology means for detecting and quantifying movement of the inner shaft;
- and
- e) means for adjustably placing the cathode in the cathode eyelet and bringing the cathode into contact with the inner shaft tip,
- whereby the distance of the cathode from the adjacent electrode may be determined in real time and adjusted to the proper distance.
An apparatus for spacing a CRT electron gun in the beaded assembly of a dispenser cathode relative to an apertured grid electrode comprising:
- a) a probe including:
- 1) an outer shaft having a shoulder for contacting a registration surface on the grid electrode;
- 2) an inner shaft concentric with, and in movable relationship to, the outer shaft;
- 3) the inner shaft further including means for extending said inner shaft a predetermined distance beyond said outer shaft shoulder;
- b) metrology means for detecting and quantifying movement of the inner shaft in relation to the outer shaft;
- c) operator interface means for displaying said quantified movement of said inner shaft operatively connected to said metrology means;
- and
- d) means for placing the cathode in contact with said inner shaft tip.
An apparatus for spacing and fixing a dispenser cathode in a cathode eyelet of a beaded assembly of a CRT electron gun at a fixed distance from an adjacent apertured grid electrode in the beaded assembly, comprising:
- a) a reference base;
- b) means for holding the beaded assembly to the reference base;
- c) probe means passable through the beaded assembly and the reference base, the probe including:
- 1) an outer shaft having a shoulder for contacting a registration surface of the adjacent electrode;
- 2) an inner shaft movable within, and extensible from, the outer shaft and having a tip sized to pass through the aperture of the adjacent electrode;
- d) means for extending the outer shaft shoulder a fixed distance from the reference base;
- e) means for extending the inner shaft a fixed distance from the outer shaft shoulder;
- f) metrology means mechanically connected to the inner shaft for detecting and quantifying movement of the inner shaft;
- g) operator interface means for indicating the movement of the inner shaft, the operator interface means being operatively connected to the metrology means;
- h) cathode placement means for adjustably placing the cathode in the cathode eyelet and bringing the cathode into contact with the inner shaft tip;
- and
- i) cathode fixing means for fixing the cathode within the cathode eyelet.
Dependencies are inferred from the claim text.