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Patent US3838856A successfully refreshed from Google Patents.
US3838856A
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US
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Target display using a fresnel lens to amplify signal from light beam gun
Assignee: Toshiba Corp
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Filing: 1973-07-31
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Granted: 1974-10-01
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Expires: 1993-07-31
Abstract
Abstract A target apparatus is used with a light beam gun, a light beam shot from which hits a transparent target and focused by a Fresnel lens to be applied in a television image pickup tube. The landing position of the light beam on the target is displayed on a television receiving set through the image pickup tube.
Inventors
- 👤 T Takeya
- 👤 T Wakaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:36
CPC Classifications
F; F41; F41G; F41G3/00; F41G3/26; F41G3/2616; F41G3/2622; F41G3/2655; F41J; F41J5/00; F41J5/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
A target apparatus according to claim 1 wherein the target means includes a transparent screen impressed with a target pattern and disposed to face the Fresnel lens.
Claim 2
Dependent Claim
52 words
A target apparatus according to claim 2 wherein the Fresnel lens is positioned on that side of the transparent screen which faces the television image pickup tube; a light discharged by the light beam gun directly impinges on the transparent screen and, after penetrating the screen, is focused by the Fresnel lens.
Claim 3
Dependent Claim
36 words
A target apparatus according to claim 3 wherein the Fresnel lens is spaced from the light-receiving surface of the television image pickup tube for a distance sustantially equal to the focal length of the Fresnel lens.
Claim 4
Dependent Claim
72 words
A target appparatus according to claim 2 wherein the display means comprises a cathode ray tube and an electric circuit for generating a signal showing the light landing position upon receipt of an output signal from the television image pickup tube and deriving said signal representing the light landing position to the cathode ray tube, thereby causing the light landing position on the target to be displayed on the cathode ray tube.
Claim 5
Dependent Claim
69 words
A target apparatus according to claim 2 wherein the display means comprises an X-Y plotter and an electric circuit for generating a signal indicating a light landing position upon receipt of an image signal from the television image pickup tube and supplying the X-Y plotter with said signal denoting the light landing position, thereby enabling the light landing position on the target to be recorded by the X-Y plotter.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |