Patent US4147420A successfully refreshed from Google Patents.
US4147420A
Expired / Lapsed
US
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Flash camera
Assignee: West Electric Co Ltd
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Filing: 1977-06-08
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Granted: 1979-04-03
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Expires: 1997-06-08
Abstract
Abstract In a flash camera having a zone-focusing system and an electronic flash device in one united body, wherein the flash camera comprises an electro-luminescence device for emitting light by AC output fed from a DC-DC converter circuit in the electronic flash device, an indicator having symbol marks for indicating an object distance and illuminated by the electro-luminescence device, and a pointer, linked to a focus-adjusting device for adjusting focus of the main photographic lens of the camera, for pointing the symbol marks on the indicator. The symbol marks can be easily identified through the illumination by the electro-luminescence device and further a voltage decrease of power source battery in the DC-DC converter circuit can be easily and clearly observed.
Inventors
- 👤 Hiroshi Iwata
- 👤 Tetsuo Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:13
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0503
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A flash camera comprising an electronic flash device for flashing a flash tube by an electric charge stored in a capacitor by a high voltage from a DC-DC converter circuit, and a zone focus type focusing system including a finder, an object-distance indicating means and a focus-adjusting means, said indicating means having an indicator with symbol marks of the object distance thereon and a pointer linked to said focus-adjusting means, characterized in that: said indicating means has an electro-luminescent device which is connected to said DC-DC converter and is situated to illuminate said symbol marks and said pointer and further comprising: a frame having a light-reflecting face for reflecting the images of said symbol marks and said pointer to an eye piece of said finder.
Claim 2
Dependent Claim
125 words
A flash camera comprising an electronic flash device for flashing a flash tube by an electric charge stored in a capacitor by a high voltage from a DC-DC converter circuit, and a zone focus type focusing system including a finder, an object-distance indicating means and a focus-adjusting means, said indicating means having an indicator with symbol marks of the object distance thereon and a pointer linked to said focus-adjusting means, characterized in that: said indicating means has an electro-luminescent device which is connected to said DC-DC converter and is situated to illuminate said symbol marks and said pointer and further comprising: a frame having a light-reflecting face for reflecting the images of said symbol marks and said pointer to an eye piece of said finder.
Claim 3
Dependent Claim
37 words
A flash camera of claim 1, wherein said finder comprises an objective lens, an eye piece and a half-mirror inbetween said indicating means comprises a mirror which reflects the image of the symbol marks toward said half-mirror.
Claim 4
Dependent Claim
127 words
A flash camera comprising an electronic flash device for flashing a flash tube by an electric charge stored in a capacitor by a high voltage from a DC-DC converter circuit, and a zone focus type focusing system including a finder, an object-distance indicating means and a focus-adjusting means, said indicating means having an indicator with symbol marks of the object distance thereon and a pointer linked to said focus-adjusting means, characterized in that said indicating means has a lighting means which is connected to said DC-DC converter and is situated to illuminate said symbol marks and said pointer; and said camera further comprises a frame having a light-reflecting face for reflecting the images of said symbol marks and said pointer to an eye piece of said finder.
Claim 5
Dependent Claim
127 words
A flash camera comprising an electronic flash device for flashing a flash tube by an electric charge stored in a capacitor by a high voltage from a DC-DC converter circuit, and a zone focus type focusing system including a finder, an object-distance indicating means and a focus-adjusting means, said indicating means having an indicator with symbol marks of the object distance thereon and a pointer linked to said focus-adjusting means, characterized in that said indicating means has a lighting means which is connected to said DC-DC converter and is situated to illuminate said symbol marks and said pointer; and said camera further comprises a frame having a light-reflecting face for reflecting the images of said symbol marks and said pointer to an eye piece of said finder.
Claim 6
Dependent Claim
38 words
A flash camera of claim 3, wherein said finder comprises an objective lens, an eye piece and a half-mirror inbetween and said indicating means comprises a mirror which reflects the image of the symbol marks toward said half-mirror.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |