US3900854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure apparatus for forming fluorescent screens of colour picture tubes
Assignee: Hitachi Ltd
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Filing: 1974-02-21
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Granted: 1975-08-19
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Expires: 1994-02-21
Abstract
Abstract In exposure apparatus for forming a fluorescent screen of a colour picture tube provided with a slot type colour selection electrode of the type wherein a photosenstiive film coated on the inner surface of the panel of the tube is exposed by the light emitted by exposure light source and transmitting through a correction lens and the slot of the colour selection electrode, there is provided driving device for moving the exposure light source along a straight line extending in the longitudinal direction of the slot of the colour selection electrode and for oscillating the correction lens about the center thereof so as to move the exposure light in the longitudinal direction of the slot.
Inventors
- 👤 Kuniharu Osakabe
- 👤 Fumiaki Yonai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:48
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
In exposure apparatus for forming a fluorescent screen of a colour picture tube of the type comprising means for supporting a panel of said colour picture tube, said panel being coated with a photosensitive film on the inner surface thereof, and said panel being provided with a slot type colour selection electrode on the inside thereof, an exposure light source adapted to direct exposure light to the inner surface of said panel and positioned a predetermined distance spaced apart from said inner surface, and an optically transparent body interposed between said exposure light source and said colour selection electrode for diffracting said exposure light, the improvement which comprises driving means for linearly moving said exposure light source in a plane containing an axis extending in the longitudinal direction of the slots of said colour selection electrode and for simultaneously oscillating said optically transparent body with respect to said plane.
Claim 2
Dependent Claim
149 words
In exposure apparatus for forming a fluorescent screen of a colour picture tube of the type comprising means for supporting a panel of said colour picture tube, said panel being coated with a photosensitive film on the inner surface thereof, and said panel being provided with a slot type colour selection electrode on the inside thereof, an exposure light source adapted to direct exposure light to the inner surface of said panel and positioned a predetermined distance spaced apart from said inner surface, and an optically transparent body interposed between said exposure light source and said colour selection electrode for diffracting said exposure light, the improvement which comprises driving means for linearly moving said exposure light source in a plane containing an axis extending in the longitudinal direction of the slots of said colour selection electrode and for simultaneously oscillating said optically transparent body with respect to said plane.
Claim 3
Dependent Claim
53 words
The exposure apparatus according to claim 1 wherein the linear movement of said exposure light source and the oscillating movement of said optically transparent body are timed such that the exposure light transmitted through said optically transparent body is moved substantially in the longitudinal direction of the slot of said colour selection electrode.
Claim 4
Dependent Claim
22 words
The exposure apparatus according to claim 1 wherein said optically transparent body is oscillated in the vertical direction about the center thereof.
Claim 5
Dependent Claim
29 words
The exposure apparatus according to claim 3 wherein said optically transparent body is oscillated in a plane containing a straight line along which said exposure light source is reciprocated.
Claim 6
Dependent Claim
16 words
The exposure apparatus according to claim 1 wherein said optically transparent body comprises a correction lens.
Claim 7
Dependent Claim
34 words
The exposure apparatus according to claim 1 wherein said optically transparent body comprises a correction lens and an additional lens, and wherein said correction lens is held stationary and said additional lens is oscillated.
Claim 8
Dependent Claim
24 words
The exposure apparatus according to claim 6 wherein said additional lens is oscillated in a vertical plane about the center of said additional lens.
Claim 9
Dependent Claim
23 words
The exposure apparatus according to claim 7 wherein said vertical plane contains a straight line along which said exposure light source is reciprocated.
Claim 10
Dependent Claim
93 words
The exposure apparatus according to claim 1 wherein said driving means comprises first and second heart shaped rotary cams adapted to drive said exposure light source and said optically transparent body respectively, the size, contour and positional relationship of said first and second cams being selected such that the light beam emanated from said exposure light source is diffracted by said optically transparent body and is then caused to reach said photosensitive film in the longItudinal direction of the slot of said colour selection electrode while said exposure light source is moved linearly.
References Cited (Backward Citations)
US3559546A
Cited
US3810196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |