US5331166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental X-ray image detecting device with an automatic exposure function
Assignee: Hamamatsu Photonics KK
•
Filing: 1992-10-21
•
Granted: 1994-07-19
•
Expires: 2012-10-21
Abstract
Abstract A medical X-ray image detecting device arranged such that an X-ray image sensor comprising an x-ray fluorescent element, a solid-state image pickup device and a plurality of optical fiber bundles for optically connecting the fluorescent surface of the X-ray fluorescent element to the image pickup surface of the image pickup device, is housed in an outer casing, the medical image detecting device being characterized in that it further comprises an X-ray intensity detecting element disposed in the casing adjacent to the X-ray fluorescent element. Clear X-ray images with a constant blackening degree can be obtained by controlling X-ray radiation time using the X-ray dose calculated by integrating the X-ray intensity output from the X-ray intensity detecting element with respect to X-ray exposure time.
Inventors
- 👤 Dario B. Crosetto
- 👤 Miyaguchi Kazuhisa
- 👤 Norio Takahashi
- 👤 Takao Makino
- 👤 Keisuke Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:35
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/38; H05G1/42; H05G1/44; A; A61; A61B; A61B6/00; A61B6/50; A61B6/51; A61B6/512; H04; H04N; H04N23/00; H04N23/30; H05G1/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A dental X-ray image detecting device to be disposed in an inter-oral region behind a tooth to be photographed, wherein X-rays penetrating the tooth are converted into an optical image and the optical image is then converted into a digital signal to be reproduced on a monitor display, said dental X-ray image detecting device arranged such that an X-ray image sensor comprising a first X-ray fluorescent element, a solid-state image pickup device mounted on a surface of a fixture substrate and a plurality of optical fiber bundles for optically connecting a fluorescent surface of the X-ray fluorescent element to an image pickup surface of the image pickup device, is housed in an outer casing, said dental image detecting device further comprising an X-ray intensity detecting element secured to the surface of the fixture substrate, said detecting element comprising a photo detecting element and a second X-ray fluorescent element mounted on the photo detecting element, wherein cores of filaments of all of the glass fiber bundles are joined substantially perpendicular both to the fluorescent surface of the first X-ray fluorescent element and to the surface of the solid-state image pickup device, each of said bundles having a diameter substantially equal to one another, and a bottom section of said outer casing, located in the X-ray radiation direction from the X-ray fluorescent element, includes an X-ray shield material.
Claim 2
Dependent Claim
226 words
A dental X-ray image detecting device to be disposed in an inter-oral region behind a tooth to be photographed, wherein X-rays penetrating the tooth are converted into an optical image and the optical image is then converted into a digital signal to be reproduced on a monitor display, said dental X-ray image detecting device arranged such that an X-ray image sensor comprising a first X-ray fluorescent element, a solid-state image pickup device mounted on a surface of a fixture substrate and a plurality of optical fiber bundles for optically connecting a fluorescent surface of the X-ray fluorescent element to an image pickup surface of the image pickup device, is housed in an outer casing, said dental image detecting device further comprising an X-ray intensity detecting element secured to the surface of the fixture substrate, said detecting element comprising a photo detecting element and a second X-ray fluorescent element mounted on the photo detecting element, wherein cores of filaments of all of the glass fiber bundles are joined substantially perpendicular both to the fluorescent surface of the first X-ray fluorescent element and to the surface of the solid-state image pickup device, each of said bundles having a diameter substantially equal to one another, and a bottom section of said outer casing, located in the X-ray radiation direction from the X-ray fluorescent element, includes an X-ray shield material.
Claim 3
Dependent Claim
32 words
A dental X-ray image detecting device according to claim 1, wherein said X-ray intensity detecting element is secured to a top surface of the fixture substrate adjacent to the X-ray image sensor.
Claim 4
Dependent Claim
26 words
A dental X-ray image detecting device according to claim 1, wherein said X-ray intensity detecting element is secured to a bottom surface of the fixture substrate.
Claim 5
Dependent Claim
34 words
A dental X-ray image detecting device according to claim 1, 2 or 3 wherein at least a front surface section on an X-ray incident side of said casing comprises a soft X-ray absorbing material.
References Cited (Backward Citations)
US3622785A
Cited
US4160997A
Cited
US4210812A
Cited
JPS5991383A
Cited
EP0129451A1
Cited
US4639943A
Cited
US4739168A
Cited
JPH01253682A
Cited
JPH01276597A
Cited
US4987307A
Cited
US5008547A
Cited
US5138166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-18 | 1998-01-17 | 1998-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-18 | 2002-01-17 | 2002-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-18 | 2006-01-17 | 2006-07-19 | $7700.00 | Window Closed / Lapsed |