Electronic cassette

Patent metadata

Field	Value
Publication number	US-9322934-B2
Application number	US-201414204596-A
Country	US
Kind code	B2
Filing date	Mar 11, 2014
Priority date	Mar 12, 2013
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A chamfered portion configured to have a surface which is tilted to a side surface and a rear surface is formed between the side surface and the rear surface of a housing of an electronic cassette. The chamfered portion has a boundary portion having a predetermined range in the vicinity of a boundary including the boundary with the side surface; a boundary portion having a predetermined range in the vicinity of a boundary including the boundary with the rear surface, and the other portion which does not belong to these boundary portions. The chamfered portion needs to be smoothly inserted into a gap between a patient and an installation surface on which the patient lies on one's back. Therefore, an entire surface of these boundary portions is formed in a curved surface which protrudes outward from the housing.

First claim

What is claimed is:

1. An electronic cassette comprising:
an image detection unit that detects a radiographic image of a photographic subject;
a rectangular parallelepiped housing that accommodates the image detection unit, and that has a front surface on which radiation is incident, a rear surface opposing the front surface, and four side surfaces; and
a chamfered portion that is disposed between at least one of the side surfaces and the rear surface, and that is configured to have a surface tilted to the side surface and the rear surface,
wherein a boundary portion between the chamfered portion and the rear surface is formed in a curved surface which protrudes outward from the housing,
wherein the chamfered portion satisfies a condition of h<d 1 when assuming that a height of the housing in a thickness direction is h and a length in a horizontal direction which is orthogonal to the thickness direction is d 1 in the respective boundaries between the rear surface and the side surface, and
wherein the height h is 7 mm to 10 mm and the length d 1 is 20 mm to 40 mm.

2. The electronic cassette according to claim 1
wherein in a cross-sectional shape of the chamfered portion, the boundary portion with the rear surface is an arc or an elliptical arc which is formed by cutting off a portion from a perfect circle or an ellipse.

3. The electronic cassette according to claim 2 ,
wherein the rear surface is a tangent to the perfect circle or the ellipse, and a boundary between the chamfered portion and the rear surface is a tangent point to the perfect circle or the ellipse.

4. The electronic cassette according to claim 1 ,
wherein the largest member out of members accommodated inside the housing satisfies a condition of d 2 <d 3 when assuming that the shortest distance between an end portion of the largest member whose planar size is largest and an inner wall surface of the side surface is d 2 and the shortest distance between the end portion of the largest member and an inner wall surface of the chamfered portion is d 3 .

5. The electronic cassette according to claim 4 ,
wherein the largest member is a base to which a circuit board is attached.

6. The electronic cassette according to claim 4 ,
wherein when the largest member is arranged in the thickness direction inside the housing, the largest member is fitted within a range of a height from a boundary between the chamfered portion and the side surface to the front surface.

7. The electronic cassette according to claim 6 ,
wherein the rear surface has a battery mounting unit on which a battery unit for supplying power to the image detection unit is detachably mounted and which is a concave portion in which the rear surface is recessed toward the front surface, and
wherein when the battery mounting unit is arranged in the thickness direction inside the housing, the battery mounting unit is fitted within a range of a height from the rear surface to the boundary between the chamfered portion and the side surface.

8. An electronic cassette comprising:
an image detection unit that detects a radiographic image of a photographic subject;
a rectangular parallelepiped housing that accommodates the image detection unit, and that has a front surface on which radiation is incident, a rear surface opposing the front surface, and four side surfaces; and
a chamfered portion that is disposed between at least one of the side surfaces and the rear surface, and that is configured to have a surface tilted to the side surface and the rear surface,
wherein a boundary portion between the chamfered portion and the rear surface is formed in a curved surface which protrudes outward from the housing, and
wherein the largest member out of members accommodated inside the housing satisfies a condition of d 2 <d 3 when assuming that the shortest distance between an end portion of the largest member whose planar size is largest and an inner wall surface of the side surface is d 2 and the shortest distance between the end portion of the largest member and an inner wall surface of the chamfered portion is d 3 .

9. The electronic cassette according to claim 8 ,
wherein when the largest member is arranged in the thickness direction inside the housing, the largest member is fitted within a range of a height from a boundary between the chamfered portion and the side surface to the front surface.

10. An electronic cassette comprising:
an image detection unit that detects a radiographic image of a photographic subject;
a rectangular parallelepiped housing that accommodates the image detection unit, and that has a front surface on which radiation is incident, a rear surface opposing the front surface, and four side surfaces; and
a chamfered portion that is disposed between at least one of the side surfaces and the rear surface, and that is configured to have a surface tilted to the side surface and the rear surface,
wherein a boundary portion between the chamfered portion and the rear surface is formed in a curved surface which protrudes outward from the housing,
wherein an entire surface of the chamfered portion which includes a boundary portion with the rear surface and a boundary portion with the side surface is formed in a curved surface which protrudes outward from the housing, and
wherein the largest member out of members accommodated inside the housing satisfies a condition of d 2 <d 3 when assuming that the shortest distance between an end portion of the largest member whose planar size is largest and an inner wall surface of the side surface is d 2 and the shortest distance between the end portion of the largest member and an inner wall surface of the chamfered portion is d 3 .

11. The electronic cassette according to claim 10 ,
wherein when the largest member is arranged in the thickness direction inside the housing, the largest member is fitted within a range of a height from a boundary between the chamfered portion and the side surface to the front surface.

Assignees

• Fujifilm Corp

Inventors

• Ogura Ryosuke
• Noguchi Shinsuke
• Kobayashi Takeyasu

Classifications

• A61B6/4233 Primary

  using matrix detectors · CPC title

• G03B42/04

  Holders for X-ray films · CPC title

• G01T1/2006 Primary

  using a combination of a scintillator and photodetector which measures the means radiation intensity · CPC title

• A61B6/4283

  characterised by a detector unit being housed in a cassette · CPC title