Electric lamp and discharge devices – With temperature modifier – For lead-in-seal or stem protection
Patent
1993-11-15
1995-02-14
Blankenship, Howard B.
Electric lamp and discharge devices
With temperature modifier
For lead-in-seal or stem protection
313477R, G03B 2900
Patent
active
053899857
ABSTRACT:
An imaging system such as an image recorder or scanner is provided with a rearview cathode ray tube. A transparent viewport of optical quality is provided along an optical axis of the CRT which is perpendicular to the CRT faceplate and generally centered with respect to the image area. The electron beam used for scanning the images is placed off-axis with respect to the CRT screen. A deflection control system compensates for spherical distortion and for the keystone effect that results from the off-axis placement of the electron gun. The structure of the present invention eliminates halation, thereby improving the dynamic range and contrast achievable for imaging and/or scanning purposes. The phosphor layer used in the CRT is made substantially thicker than in conventional CRTs, thereby reducing blemishes and improving uniformity, resolution and light output. The partial sharing of electron beam and optical paths enables more compact imaging and scanning systems to be provided.
REFERENCES:
patent: Re33973 (1992-06-01), Kriz et al.
patent: 2241974 (1941-05-01), Anderson et al.
patent: 3526800 (1970-09-01), Johnson
Keeney Richard A.
Olson Thor A.
Blankenship Howard B.
Lipsitz Barry R.
Management Graphics, Inc.
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