US3875627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a target plate for a color television camera tube
Assignee: Panasonic Holdings Corp
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Filing: 1973-03-20
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Granted: 1975-04-08
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Expires: 1993-03-20
Abstract
Abstract A method of manufacturing a target plate for a color television camera tube comprising a face plate including a fiber plate and a photoconductive target electrode having nonconductive portions of a stripe shape and provided on the inner surface of the face plate, comprising the steps of successively forming a transparent conductive film and a photoresist film on the inner surface of the face plate, setting an optical mask on the outer surface of the face plate, irradiating ultraviolet rays on the photoresist film through the photomask and the face plate to selectively expose the photoresist film to the ultraviolet rays and developing the photoresist film to obtain an apertured photoresist film to form the nonconductive portions.
Inventors
- 👤 Tadashi Hasegawa
- 👤 Hirofumi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:30
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/46; H01J29/00; H01J29/86; H01J29/89; H01J29/892; H01J9/00; H01J9/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A method of manufacturing a target plate for a color television camera tube comprising the steps of: forming a transparent conductive film and a photoresist film successively on the inner surface of a face plate made of a fiber plate; selectively exposing said photoresist film to light beams transmitted through said face plate and an optical mask disposed on the outer surface of said face plate and developing said photoresist film to form narrow apertures in the photoresist film; etching said transparent conductive film using said apertured photoresist film as an etch mask to form stripe-shaped narrow holes in said transparent conductive film; removing said photoresist film; forming a photoconductive film uniformly on said transparent conductive film having the narrow holes; and disposing an optical filter having stripes for generating an indexing signal corresponding to said narrow holes on the outer surface of said face plate.
Claim 2
Independent Claim
146 words
A method of manufacturing a target plate for a color television camera tube comprising the steps of: forming a transparent conductive film and a photoresist film successively on the inner surface of a face plate made of a fiber plate; selectively exposing said photoresist film to light beams transmitted through said face plate and an optical mask disposed on the outer surface of said face plate and developing said photoresist film to form narrow apertures in the photoresist film; etching said transparent conductive film using said apertured photoresist film as an etch mask to form stripe-shaped narrow holes in said transparent conductive film; removing said photoresist film; forming a photoconductive film uniformly on said transparent conductive film having the narrow holes; and disposing an optical filter having stripes for generating an indexing signal corresponding to said narrow holes on the outer surface of said face plate.
Claim 3
Independent Claim
118 words
A method of manufacturing a target plate for a color television camera tube comprising the steps of: forming a transparent conductive film and a photoresist film successively on the inner surface of a face plate made of a fiber plate; selectively exposing said photoresist film to light beams transmitted through said face plate and an optical mask disposed on the outer surface of said face plate and developing said photoresist film to form a stripe-shaped photoresist film; forming a photoconductive film uniformly on said transparent conductive film coated with the photoresist film; and disposing an optical filter having stripes for generating an indexing signal corresponding to said stripe-shaped photoresist film on the outer surface of said face plate.
Claim 4
Independent Claim
118 words
A method of manufacturing a target plate for a color television camera tube comprising the steps of: forming a transparent conductive film and a photoresist film successively on the inner surface of a face plate made of a fiber plate; selectively exposing said photoresist film to light beams transmitted through said face plate and an optical mask disposed on the outer surface of said face plate and developing said photoresist film to form a stripe-shaped photoresist film; forming a photoconductive film uniformly on said transparent conductive film coated with the photoresist film; and disposing an optical filter having stripes for generating an indexing signal corresponding to said stripe-shaped photoresist film on the outer surface of said face plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |