JP2003287833A - Cassette for photographing radiation image and radiographic image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cassette for photographing radiation image and a radiographic image reader with which image information is recorded and read without applying a burden to a stimulable phosphor sheet. <P>SOLUTION: One-operation enables a front plate to be integrated with a back plate in the cassette for photographing radiation image or to be separated from the back plate depending on the coming and going state of a section to be locked provided on a first and a second connecting member actuated by means of a push latch mechanism or the moving state of a slide section. Transportation is done in a state in which the cassette for photographing radiation image is separated into the front plate and the back plate in the radiographic image reader and the stimulable phosphor sheet is provided on the separated back plate to read the image information. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation image capturing cassette containing a stimulable phosphor sheet, and a radiation image reading apparatus for reading radiation image information accumulated in the stimulable phosphor sheet.

[0002]

2. Description of the Related Art Conventionally, a radiation image represented by an X-ray image has been widely used for disease diagnosis and the like. As a method for obtaining this radiation image, a "stimulable phosphor" is used that accumulates and records the irradiated radiation energy and stimulates and emits light in accordance with the accumulated and recorded irradiation energy when irradiated with excitation light. The radiation image recording / reproducing system has been proposed. This radiation image recording / reproducing system irradiates the stimulable phosphor with the radiation that has passed through the subject, thereby stimulating the radiation energy (hereinafter referred to as "image information") corresponding to the radiation transmission density of each part of the subject. Accumulated in phosphor,
After recording, the excited radiation accumulates in the stimulable phosphor to cause the recorded radiation energy to emit stimulated emission, and the intensity of the stimulated emission light is converted into an electric signal, and this electric signal is transferred to a photosensitive material or the like. The image is reproduced as a visible image through an image display device such as an image recording material or a CRT.

The photostimulable phosphor is generally laminated on a sheet-shaped support, and is often handled as a photostimulable phosphor sheet by being housed in a cassette for radiographic imaging. The cassette containing the stimulable phosphor sheet is placed at a predetermined position and used for radiation image capturing. Radiographic imaging cassette (hereinafter referred to as "cassette")
Is a flat housing capable of accommodating the stimulable phosphor sheet, which prevents physical damage to the stimulable phosphor sheet during transportation or at the time of photographing, and at the same time, prevents the stimulable phosphor sheet from being photographed. The sheet is prevented from being erased by irradiating the sheet with light and accumulated image information. Then, when reproducing and reading the image information accumulated and recorded in the stimulable phosphor sheet by radiographic imaging, the stimulable phosphor sheet taken out from the cassette is scanned with excitation light. As a radiation image reading device for reading image information in this way, there is, for example, a device disclosed in Japanese Patent Laid-Open No. 11-338079. According to this device, the opening / closing lid provided in the cassette inserted in the device is opened, the stimulable phosphor sheet is pulled out from the resulting opening, and the image information is read from the stimulable phosphor sheet in the image reading unit. Can be read.

[0004]

However, according to the above-mentioned radiation image reading apparatus, the stimulable phosphor sheet is pulled out from the opening of the cassette, and the stimulable phosphor sheet is transferred to the image reading portion by a roller pair or the like. Since it is conveyed by the above method, the photostimulable phosphor sheet may be deteriorated by a load such as friction and bending, and the image information stored and recorded may be deteriorated.

An object of the present invention is to provide a radiation image capturing cassette and a radiation image reading apparatus capable of recording and reading image information without imposing a load on the stimulable phosphor sheet.

[0006]

In order to solve the above problems, the invention according to claim 1 is housed in a front member on the side of incidence of radiation, a back member facing the front member, and the back member. In a cassette for radiographic imaging, comprising a stimulable phosphor sheet, the back member has, at both ends in the longitudinal direction, a locked portion provided so as to be able to go in and out from each end, and a width direction. A slide portion that protrudes from both ends of the front portion and is movable in the longitudinal direction, and the front member is provided inside the both end portions in the longitudinal direction and locks the locked portion. The present invention is characterized by including a locking portion and second locking portions which are provided at both ends in the width direction and which can lock and unlock the slide portion by moving the slide portion.

According to the first aspect of the present invention, the back member of the cassette for radiographic image is provided at both ends in the longitudinal direction.
Equipped with lockable parts that can be moved in and out from each end, and slide parts that project from both ends in the width direction and are respectively movable in the longitudinal direction. The front member of the cassette for use is engaged by the movement of the first locking portion that locks the locked portion that is provided inside both ends in the longitudinal direction and the slide members that are provided at both ends in the width direction. Since the second locking portion that can be stopped and unlocked is provided, the back member and the front member are locked depending on the locked states of the locked portion and the first locking portion and the sliding portion and the second locking portion. And can be integrally combined or separated. Therefore, if the back member and the front member are integrated, the stimulable phosphor sheet can be housed in the radiation image capturing cassette so as to prevent the damage and the like, and the back member and the front member are separated from each other. In that case, the stimulable phosphor sheet can be taken out in order to read the image information accumulated and recorded in the stimulable phosphor sheet.

According to a second aspect of the present invention, in the radiation image capturing cassette according to the first aspect, the back member is
A pinion, a rack portion that meshes with the pinion, and the locked portion are provided, and the rotation of the pinion causes the locked portion to move in the longitudinal direction so that the locked portion enters and exits one longitudinal end portion. No. 1 connecting member, a rack portion that meshes with the pinion, and the locked portion are provided, and the rotation of the pinion moves in a direction opposite to the first connecting member to lock the locked portion. And a second connecting member that goes in and out of the other longitudinal end portion.

According to the second aspect of the invention, it is needless to say that the same effect as that of the first aspect of the invention can be obtained. In particular, the locked portion is the first connection provided with the rack portion. The first connecting member and the second connecting member are respectively provided on the member and the second connecting member, and the first connecting member and the second connecting member operate in the opposite directions by the pinions that mesh with the rack portion,
The locked portions provided on the first connecting member and the locked portions provided on the second connecting member are moved in and out from the respective ends. Therefore, it is possible to perform interlocking locking and unlocking by the locked portion and the first locking portion at both ends in the longitudinal direction of the radiographic imaging cassette.

According to a third aspect of the present invention, in the cassette for radiographic imaging according to the second aspect, at least one of the first connecting member and the second connecting member is provided with the slide portion. Characterize.

According to the invention of claim 3, it is needless to say that the same effect as that of the invention of claim 2 can be obtained, and in particular, at least one of the first connecting member and the second connecting member. Since the slide part is provided in the slide part, the slide part can perform an operation linked with the locked part by the operation of the rack and the pinion. Therefore, at both ends in the longitudinal direction of the radiation image capturing cassette, the locked and unlocked portions are locked and unlocked by the first locking portion, and at the both ends in the width direction of the radiation image capturing cassette, slide portions are formed. Locking and unlocking by the first locking portion can be performed in conjunction with each other.
That is, the locking and unlocking of the four sides of the radiation image capturing cassette can be performed in conjunction with each other.

According to a fourth aspect of the present invention, in the cassette for radiographic imaging according to the third aspect, the slide portion is
The back member is provided at substantially equal points of the length of the back member in the longitudinal direction.

According to the invention described in claim 4, it is needless to say that the same effect as that of the invention described in claim 3 can be obtained. In particular, the sliding portion is substantially equal to the longitudinal length of the back member. Since the points are provided, it is possible to evenly disperse the force applied to both end portions in the width direction of the radiation image capturing cassette. Therefore, for example, when a force or action that separates the front member and the back member, which are integrated as a radiographic image capturing cassette, is applied, the force and action are evenly distributed, and a part of the radiographic image capturing cassette is used. It is possible to prevent the concentration of force and action on, and to prevent damage or deformation of that portion.

According to a fifth aspect of the present invention, in the cassette for radiographic imaging according to any of the second to fourth aspects, the first connecting member and the second connecting member are operated by a push latch mechanism. The entrance and exit of the locked portion provided in the first connecting member and the second connecting member from the longitudinal end portion and the movement of the slide portion are switched.

According to the invention of claim 5, claim 2
It is needless to say that the same effect as that of the invention described in any one of 4) can be obtained, in particular, the first and second connecting members are operated by the push latch mechanism, and the locked members provided on the respective connecting members are locked. Since the movement of the slide portion and the movement of the portion can be switched, it is possible to switch between locking and non-locking by a plurality of locked portions, a plurality of sliding portions, etc. by one operation of the push latch mechanism. Therefore, it is possible to easily combine the front member and the back member into one body or separate the front member and the separate body with one operation.

According to a sixth aspect of the present invention, there is provided a radiographic image reading device for reading a radiographic image from a stimulable phosphor sheet provided in the radiographic image capturing cassette according to any one of the first to fifth aspects. In the radiation image capturing cassette, the back member is provided with a magnetic portion having magnetism, and a detection unit that detects a size of the radiation image capturing cassette and the back member of the radiation image capturing cassette are provided. Holding means for holding the magnetic part by magnetic force, and a detaching means for gripping the front member of the radiation image capturing cassette and removing the back member held by the holding means from the holding means, and the detecting means. Based on the size of the radiographic imaging cassette detected by Characterized in that it comprises speed control means to.

According to the sixth aspect of the present invention, the radiation image detected by the detecting means when the removing means removes the back member from the holding means that holds the back member provided with the magnetic portion having magnetism by magnetic force. Since the removal speed control means controls the removal speed by the removal means based on the size of the imaging cassette, the back member removal operation can be performed according to the size of the radiation image capturing cassette. That is, when the front member of the cassette for radiographic imaging is grasped and the back member integrally fixed via the locking portion, the locked portion, etc. is removed from the holding means, those locking portion, locked portion However, the load can be reduced by controlling the removal speed by the removal speed control means. In particular, when the size of the radiation image capturing cassette is large, or the radiation image capturing cassette has a long shape, and the load for removing the back member of the cassette is large,
By controlling the removal speed by the removal speed control means, the removal means can perform an appropriate removal operation.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 4 are views showing one embodiment of a radiation image capturing cassette 1 (hereinafter, cassette 1) according to the present invention. FIG. 1 is a perspective view when the front plate 10 and the back plate 20 of the cassette 1 are separated, and FIG. 2 is a view schematically showing a cross section when the front plate 10 and the back plate 20 of the cassette 1 are combined. 3 is a view for explaining the lock mechanism of the cassette 1, and FIG. 4 is a sectional view of the cassette 1 showing the state of the lock mechanism.

The cassette 1 is composed of a front plate 10 as a separable front member, a back plate 20 as a back member, a stimulable phosphor sheet 28 provided on the back plate 20, and the like.

The front plate 10 is composed of a frame 11 and a front plate 13 inscribed on the inner surface of the frame 11. As shown in FIG. 2, the frame 11 includes a frame front surface portion 114 that faces the front surface side and a frame side surface portion 11 that is bent substantially at a right angle from the end portion of the frame front surface portion 114 to the rear surface side.
0, from the end of the frame side surface 110 further bent inward in the width direction substantially vertically, and from the end of the frame rear surface 111 bent at a predetermined angle in the direction of the frame front 114. Inclined surface portion 112 extending
Have and. Also, on the back surface of the frame front surface portion 114,
Light-shielding protrusion 11 protruding in the same direction as the frame side surface 110
5 are provided. In addition, the frame front surface portion 114,
Frame side surface portion 110, inclined surface portion 112, and light-shielding protrusion 1
The space surrounded by 15 forms a recess 12 inside the frame 11. Further, the frame rear surface portion 111 and the inclined surface portion 112 are provided with notches 15a, 15 for the lock claws.
b, 15c and 15d are formed. In addition, the insertion hole 14 is provided on one end side in the longitudinal direction of the frame side surface portion 110, and the grip concave portions 16a and 16b are formed on the width direction end portion side of the frame side surface portion 110.

The frame 11 is formed by molding a strong material such as aluminum or hard plastic, and is made of a material that can withstand the load applied to the front plate 10. The front plate 13 is preferably formed of a member having relatively small radiation absorption, such as aluminum or carbon fiber reinforced plastic.

The back plate 20 is composed of a back plate body 21, a stimulable phosphor sheet 28 and the like. The back plate body 21 includes a back plate rear surface portion 210 and a back plate rear surface portion 21.
Back plate side surface portion 211 bent from 0 to the front side at a substantially right angle
Have and. In addition, on the front surface of the back plate rear surface portion 210,
Inner wall 213 protruding in the same direction as the back plate side surface portion 211
And ribs 214 are provided. A recess 22 is formed in a space surrounded by the back plate rear surface portion 210, the back plate side surface portion 211, and the inner wall 213. In addition, an insertion hole 34 is formed in the back plate side surface portion 211 on one end side in the longitudinal direction of the cassette 1. Further, the back plate side surface portion 2
On the side of the end portion 11 in the longitudinal direction, the openings 31a, 31b, 3
1c and 31d have openings 33a, 33b, 33c and 33d on the widthwise end side of the back plate side surface portion 211.

The ribs 214 of the back plate 20 have, for example,
A back plate 23 having a structure in which lead foil is coated with a PET film is fixed. The back plate 23 has a strength such that the back plate 23 can be reattached with a double-sided tape or adhesive,
7 is bonded, and a stimulable phosphor sheet 28 is fixed to the front surface of the support plate 27. Thus, the stimulable phosphor sheet 28 is housed in the back plate 20.

In the cassette 1 thus constructed, when the back plate 20 and the front plate 10 are combined as shown in FIG. 2, the recess 22 of the back plate 20 is inserted into the front plate 10.
The light-blocking protrusion 115 of the
2 The back plate side surface portion 211 of the back plate 20 comes to enter. With such a structure, the back plate 20 and the front plate 10 are integrally united to form the cassette 1, and light is shielded so that external light does not reach the stimulable phosphor sheet 28. In addition, the recess 12 of the front plate 10 and the back plate 2
If the recess 22 of 0 is provided with, for example, velvet or sponge so that the back plate 20 and the front plate 10 come into closer contact with each other, the light blocking effect can be further improved.

Further, since the back plate body 21 is attracted and held by the magnetic force of the magnet in the radiation image reading apparatus which will be described later, the back plate body 21 itself is used as a magnetic portion so that the back plate body 21 can be attracted by the magnetic force. It is preferably formed of magnetic plastic or the like. Alternatively, the back plate body 21 may be formed of ordinary plastic, and a magnetic sheet (not shown) such as iron foil may be provided on the back surface 24 of the back plate 20 as a magnetic portion. In addition, the back surface 24 of the back plate 20
Alternatively, a magnetic substance may be applied to provide the magnetic portion.

In this way, the front plate 10 and the back plate 2
Although 0 is separable, radiation imaging or the like is normally performed in a combined state as shown in FIG.

Next, the lock mechanism of the cassette 1 will be described with reference to FIGS. In order to keep the front plate 10 and the back plate 20 in a combined state, the cassette 1 is provided with a lock mechanism. As a locking mechanism of the cassette 1, the front plate 10 has a notch 15 for a locking claw.
a, 15b, 15c and 15d are formed. Also,
The back plate 20 includes a first connecting member 35, a second connecting member 36, and a pinion 3 each having a lock claw as a locked portion.
It has 7 etc.

The first connecting member 35 is the first lateral member 35a.
And the back plate 20 from the center slightly right side of the first lateral member 35a.
First middle member 35b protruding inward in the longitudinal direction of the
And a first left member 35c and a first right member 35d protruding inward in the longitudinal direction of the back plate 20 from the left and right ends of the first lateral member 35a, respectively. The second connecting member 36 has a second lateral member 36a and a second intermediate member 36b that projects from the center slightly left side of the second lateral member 36a to the side opposite to the first intermediate member. The tip ends of the first middle member 35b and the second middle member 36b wait with the pinion 37 provided substantially at the center of the back plate 20 interposed therebetween, and the rack portions 35B, 36B provided on the respective side surfaces of the tip ends. , Pinion 3
By engaging with 7, the first connecting member 35 and the second connecting member 36 are connected via the pinion 37.

Also, the first lateral member 3 of the first connecting member 35.
A first left member 35c and a first right member 35 are provided near the end of 5a.
The locking claws 30a and 30b are provided as locked parts that project in the direction opposite to the projecting direction of d. Furthermore, the first
Lock claws 32a and 32d as slide members are provided on the outside of the side surface of the left member 35c, and lock claws 32b as slide members are provided on the outside of the side surface of the first right member 35d.
32c is provided. The lock claws 32a, 32
b is the longitudinal direction of the back plate 20, near the upper half,
Further, the lock claws 32c and 32d are provided in the vertical direction of the back plate 20 so as to be approximately 1/4 from the upper part.

A spring 38 having one end fixed to the first connecting member 35 and the other end fixed to the back plate rear surface portion 210.
Two a are provided. With this spring 38a, the first
The connecting member 35 is always receiving a biasing force to move in the direction of arrow Q1. Further, between the first connecting member 35 and the back plate side surface portion 211 in which the insertion hole 34 is formed, the push latch portion 39 and the push latch portion 3 are provided.
9, a spring 38b having one end fixed and the other end fixed to the back plate rear surface portion 210 is provided. This spring 3
The push latch portion 39 is constantly biased in the direction of arrow Q1 by 8b. In addition, lock claws 30c and 30d as locked portions that project in a direction opposite to the projecting direction of the second middle member 36b are provided near the end of the second horizontal member 36a in the second connecting member 36. There is.

As described above, in the present embodiment,
Lock claws 30a, 30b, 32a, 32b, 32c, 3
2d is provided on the first connecting member 35, and the lock claw 30
a, 30b, 32a, 32b, 32c, 32d are configured to interlock. On the other hand, the lock claws 30c, 30
d is provided in the second connecting member 36, and the lock claw 30c,
30d is configured to interlock. Furthermore, the first
Since the connecting member 35 and the second connecting member 36 of No. 3 are interlocked by the operation of the rack and the pinion by the rack portions 35B and 36B provided respectively and the pinion 37, all the locking claws 30a, 30b, 30c, 30d, 32
a, 32b, 32c, and 32d are interlocked.

In the cassette 1 according to this embodiment, when the front plate 10 and the back plate 20 are combined, the front plate 10
The insertion hole 14 has a positional relationship corresponding to the insertion hole 34 of the back plate 20. Then, each time the rod-shaped member (for example, the lock pin 55) is inserted from the insertion hole 14 (insertion hole 34) and the push latch portion 39 is pushed, the state of the lock mechanism (lock ON state / lock OFF state) is switched. (Push latch method) is used. The push latch method is well known as a mechanism used when the core of a ballpoint pen is taken in and out from the ballpoint pen exterior.

Next, the lock O is locked by the above-mentioned lock mechanism.
The N / OFF operation will be described. The lock ON state is
Lock claws 30a, 30b, 30c, 30 that are locked parts
The tips of d are the opening portions 31a, 3 of the back plate side surface portion 211.
1b, 31c, 31d projecting outward, front plate 1
No. 0 frame front surface 114 and inclined surface 112 inward surface 1
It is the state shown in FIG. At this time, the push latch portion 39 is in contact with the back plate side surface portion 211, and is in the state shown in FIG. 4B separated from the first connecting member 35. Also, the lock claw 32a, which is a slide part,
32b, 32c, and 32d are the states shown in FIGS. 4E and 4F, which have entered between the frame front surface portion 114 of the front plate 10 and the inward surface 113 of the inclined surface portion 112.

In such a lock ON state, the rod-shaped member is moved from the insertion hole 14 (insertion hole 34) in the direction of arrow P 1
When it is inserted only once and the push latch portion 39 is pressed, the push latch portion 39 pushes the first connecting member 35 in the direction of arrow Q2. Then, the first connecting member 35 is indicated by the arrow Q2.
The push latch portion 39 stops in a state where the push latch portion 39 has moved a predetermined distance in the direction of, and the state shown in FIG. At this time, the lock claw 30a provided on the first connecting member 35,
The state in which the tip of 30b has entered the inside of the back plate side surface portion 211 is shown in FIG. 4 (C). This FIG. 4 (C),
The state shown in (D) is the lock OFF state of the lock mechanism.

At this time, the lock claws 32a, 32b, 32c, 32d provided on the connecting member 35 are also interlocked with each other and indicated by an arrow Q2.
The same distance in the direction of the openings 33a, 33b, 33c,
It moves in 33d and stops, and it will be in the state shown to FIG. 4 (G), (H). In this state, the lock claws 32a, 32
b, 32c, 32d and notches 15a, 15b, 15
Since the positions of c and 15d (the openings provided in the frame rear surface portion 111 and the frame inclined surface portion 112) are aligned,
Lock claws 32a, 32b, 32c, 32d are cut 1
You can get out of 5a, 15b, 15c, 15d. That is, the back plate 20 can be separated from the front plate 10. The states shown in FIGS. 4G and 4H are the lock-off states of the lock mechanism.

When the first connecting member 35 moves in the direction of the arrow Q2, the rack portion 35B of the first connecting member 35.
The rack portion 36B of the second connecting member 36 and the pinion 37 cause the rack and the pinion to move, and the second connecting member 36 also moves by the same distance in the direction of arrow R2 and then stops. Lock claw 30 provided on the connecting member 36
The tips of c and 30d enter the inside of the side surface portion 211 of the back plate to enter the lock-off state shown in FIG. 4 (C).

That is, when the lock is in the ON state, the rod member is inserted through the insertion hole 14 (insertion hole 34) only once in the direction of the arrow P and the push latch portion 39 is pressed, the lock OFF state is entered, Front board 10 and back board 2
0 becomes a separable state. The lock OFF state is continuously maintained unless the push latch portion 39 is pressed by the rod-shaped member from the insertion hole 14 (insertion hole 34).

Further, the lock O shown in FIGS.
In the FF state, when the rod member is inserted through the insertion hole 14 (insertion hole 34) only once in the direction of arrow P and the push latch portion 39 is pressed, the push latch portion 39 returns in the direction of arrow Q1. Then, the first connecting member 35 stops in a state of moving by a predetermined distance in the direction of the arrow Q1, and then, as shown in FIG.
The state becomes as shown in. At this time, the tips of the lock claws 30 a and 30 b provided on the first connecting member 35 protrude outward from the openings 31 a and 31 b of the back plate side surface part 211, and the frame front surface part 114 and the inclined surface part 112 of the front plate 10.
The lock ON state shown in FIG.

At this time, the lock claws 32a, 32b, 32c, 32d provided on the connecting member 35 are also interlocked with each other to form an arrow Q1.
The same distance in the direction of the openings 33a, 33b, 33c,
It moves in 33d and stops, and it will be in the lock ON state shown in FIGS. 4 (E) and 4 (F). That is, the back plate 20 cannot be separated from the front plate 10.

When the first connecting member 35 moves in the direction of the arrow Q1, the rack portion 35B of the first connecting member 35.
Then, the rack and pinion operation by the rack portion 36B of the second connecting member 36 and the pinion 37 occurs, the second connecting member 36 also moves by the same distance in the direction of the arrow R1 and stops, and Lock claw 30 provided on the connecting member 36
The tip ends of c and 30d are the openings 31 of the back plate side surface portion 211.
The lock-on state shown in FIG. 4 (A) protrudes outward from the c and 31 d and protrudes between the frame front surface portion 114 of the front plate 10 and the inward surface 113 of the inclined surface portion 112.

That is, when the lock is off, the rod-shaped member is moved from the insertion hole 14 (insertion hole 34) in the direction of arrow P 1
When the push-latch portion 39 is inserted only once and acts on the push-latch portion 39, the push-latch mechanism of the push-latch portion 39 shifts to the lock-on state, and the front plate 10 and the back plate 20
Is locked and fixed. And the insertion hole 14
The push latch portion 3 is formed from the (insertion hole 34) by a rod-shaped member.
This lock-on state is continuously maintained unless 9 is pressed.

As described above, in the cassette 1 according to this embodiment, the lock O is inserted every time the rod member is inserted through the insertion hole 14 (insertion hole 34) and the push latch portion 39 is pressed.
The push latch mechanism that switches between the N state and the lock-off state switches between the state in which the back plate 20 is locked to the front plate 10 and the state in which the back plate 20 is separable. Therefore, when the lock mechanism of the cassette 1 is in the lock ON state by the push-latch mechanism, the back plate 20 is locked to the front plate 10, and the stimulable phosphor sheet 28 is set in the cassette 1 (back It is housed in a plate 20).
Further, when the lock mechanism of the cassette 1 is in the lock OFF state by the push latch mechanism, the front plate 10
Since the back plate 20 and the back plate 20 can be separated, the stimulable phosphor sheet 28 is exposed by separating the back plate 20 in the radiation image reading apparatus.
The image information stored and recorded in can be read.
As described above, in the cassette 1, the front plate 10 and the back plate 20 are integrated with each other by a locking mechanism including a plurality of locking claws, so that the stimulable phosphor sheet 28 is prevented from being damaged or the like, and is reliably accommodated. It is possible to turn off the lock by a plurality of lock claws and the like by one operation, separate the front plate 10 from the back plate 20 and easily read the image information accumulated and recorded in the stimulable phosphor sheet 28,
You can take it out.

Next, the radiation image reading apparatus according to the present invention will be described. 5 to 9 are views showing an embodiment of the radiation image reading apparatus according to the present invention. 5 is a cross-sectional view of the radiographic image reading apparatus, FIG. 6 is a block diagram showing the main configuration of the radiographic image reading apparatus, FIG. 7 is an enlarged view of the vicinity of the carrying / removing section of the radiographic image reading apparatus, and FIG. 8 is a cassette 1. FIG. 9 is a perspective view of the transport / detachment unit and the moving unit, and FIG. The radiation image reading device 100 is a device for reading image information accumulated and recorded in the stimulable phosphor sheet 28 housed in the cassette 1.

As shown in FIG. 5, the radiation image reading apparatus 100 is composed of two units, a conveyance reading unit 2a and a cassette insertion / ejection unit 2b.
The structure b is detachable from the transport reading unit 2a. The transport reading unit 2a includes a transport / removal unit 50, a holding unit 60, a moving unit 70, a reading unit 80, an erasing unit 90, and the like.

The carrying / removing unit 50 is a carrying reading unit 2a.
Support 53 for supporting the cassette 1 inserted into the cassette 1, a cassette holding portion 51 for holding the cassette 1 supported by the support 53, and a cassette holding portion 51 provided at an end of the cassette holding portion 51 for rotating the cassette holding portion 51. The rotary shaft 52 and the like are included. The cassette holding portion 51 has grip claws 54a, 5
4b, and the grip claws 54a, 54b are provided on the side surface 110 of the front plate, and the grip recesses 16a, 16b are provided.
The front plate 10 is clamped and fixed by being inserted into b. The cassette 1 sandwiched by the cassette sandwiching portion 51 is attached to and detached from the holding portion 60 by a reciprocating motion of the cassette sandwiching portion 51 about the rotating shaft 52. Holding part 6
Reference numeral 0 indicates, for example, a cassette support plate 61 and a magnet 62. The magnet 62 attracts the magnetic back plate 20 (back plate body 21) of the cassette 1 to hold the back plate 20.

The moving unit 70 is, for example, a rail 71 provided between the reading unit 80 and the erasing unit 90 where the back plate 20 is attached / detached by the holding unit and the cassette holding unit 51.
And a movable part 72 fixed to the cassette support plate 61 and moving on the rail 71.
Moves the holding unit 60 holding the back plate 20 of the cassette 1 along the rail 71 to the reading unit 80 and the erasing unit 90. The reading unit 80 includes, for example, a laser scanning unit 81, a light guide 82, a condenser tube 83, a photoelectric conversion element, and the like, and reads the image information accumulated and recorded in the stimulable phosphor sheet 28. The erasing section 90 is composed of, for example, a halogen lamp, a high-intensity fluorescent lamp, an LED array, etc.
The image information remaining on the stimulable phosphor sheet 28 is erased.

The cassette insertion / ejection section 2b includes an insertion port 3, an ejection port 4, an insertion roller 42 and the like. The insertion port 3 is provided with a code detection unit 44 as a detection unit for reading a code recorded on a bar code label (not shown) on the back plate back surface 24 of the inserted cassette 1.
The code detector 44 detects the size of the inserted cassette 1 from the cassette size code, for example.

Further, as shown in FIG. 6, the radiation image reading apparatus 100 is the radiation image reading apparatus 100.
Control unit 40 that controls the entire system and performs various processes and judgments
The control unit 40 includes a code detection unit 4
4, the transport / demounting unit 50, the holding unit 60, the moving unit 70, the reading unit 80, the erasing unit 90, etc. are connected via a bus or the like. Although not shown, the control unit 40 includes a CPU for performing various arithmetic processes, a ROM for recording and storing various programs for various processes such as control and judgment, and various processing condition data for each unit for image reading. , And a RAM used as a work memory in various processes. The control unit 40 controls the operating speed when the cassette 1 is removed from the holding unit 60 by the conveyance / detachment unit 50, for example, as a removal speed control unit based on the size of the cassette detected by the code detection unit 44. To do.

Next, the operation of the radiation image reading apparatus 100 according to the present invention will be described with reference to FIGS. The cassette 1 on which the radiation image has been captured is inserted in the insertion opening 4 of the cassette insertion / ejection section 2b in the direction of arrow A1. At this time, the insertion hole 14 of the cassette 1 is on the lower side, and the front plate 13 of the front plate 10 is inserted so as to face obliquely downward. That is, the stimulable phosphor sheet 28 is inserted so that the reading surface faces diagonally downward. At this time, the code detection unit 44 detects the code recorded on the barcode label (not shown) on the back surface 24 of the back plate 24 of the inserted cassette 1 (step S101). Then, the control unit 40 specifies the size of the cassette 1 based on the code detected by the code detection unit 44 (step S102), and the processing program corresponding to the specified size of the cassette 1 is RO.
Select from M (step S103). Then, the operation control of each part based on the program, in particular, the transfer / detachment part 50 controls the removal speed when removing the cassette 1 from the holding part 60 (step S104).

Then, the insertion roller 42 operates to take the cassette 1 into the conveyance reading section 2a in the direction of arrow A2 along the dotted line a. The cassette 1 taken in is transported and
The lower end is supported by the support base 53 of the detachable unit 50,
The left and right side surfaces are clamped and supported by the cassette clamping unit 51. At this time, the tips of the grip claws 54a and 54b provided on the transport / detachment unit 50 are attached to the front plate side surface 110.
The front plate 10 is fixed to the carrying / removing unit 50 by being inserted into the grip recesses 16a and 16b existing above.

The cassette 1, which is supported and fixed to the carrying / removing section 50, rotates about the rotation axis 52 of the carrying / removing section 50 as the center of rotation from the position of the dotted line a to the position of the dotted line c in the direction of arrow A3. . When the carrying / removing unit 50 is rotationally moved to the position of the dotted line c, the back plate body 21 of the cassette 1 having the magnetic unit is magnetically attracted to the magnet 62 of the holding unit 60 at the holding unit standby position. In addition, this back plate 20
When the back plate body 21 is attracted to the magnet 62,
It is designed to follow the holding plane of the holding part 60 formed by the magnet 62. That is, the back plate 20 is
It has some rigidity and is flexible enough to follow the plane formed by the magnet 62. In this way, by providing the back plate 20 with a certain degree of flexibility, for example, even if the back plate 20 is deformed or warped due to secular change or usage conditions, the back plate 20 follows the flat surface of the magnet 62 side. Deformation and warp of the are corrected. Therefore, the surface of the stimulable phosphor sheet 28 can always be kept flat when reading image information.

The cassette 1 attracted to the magnet 62 of the holding portion 60 is locked by the push latch mechanism described above.
In the F state, the back plate 20 (back plate body 21) is held by the holding portion 60, and is separated from the front plate 10. Since the front plate 10 is separated, the stimulable phosphor sheet 28 is exposed, and together with the back plate 20, the moving unit 70 causes the image reading unit 80 to move in the direction of arrow A4.
Is moved to the image information reading position. Then, at this image information reading position, the radiation image information is read by the image reading unit 80.

Next, the stimulable phosphor sheet 28, together with the back plate 20, is moved to the erasing position in the direction of arrow A5 by the moving section 70, and the erasing light C emitted from the erasing section 90 stimulates the stimulability. The image information remaining on the phosphor sheet 28 is erased. Then, the holding unit 6 is placed at the holding unit standby position.
0 returns.

Next, with the front plate 10 fitted to the back plate 20, the push-latch mechanism described above is used to set the lock ON state, and the cassette 1 in which the back plate 20 and the front plate 10 are integrated is pulled from the holding portion 60 by the arrow A6. In the direction of the arrow, and the sheet is discharged from the discharge port 4 of the cassette insertion and discharge section 2b (A7).

Next, in the operation of the radiation image reading apparatus 100 according to the present invention, the separating operation of the back plate 20 and the front plate 10 and the attaching / detaching operation of the cassette 1 in the holding section 60 will be described in detail.

First, the back plate 20 in the holding portion 60.
The separating operation between the front plate 10 and the front plate will be described. The cassette 1 supported and fixed to the carrying / demounting unit 50 has a dotted line c.
When the back plate 20 is attracted to the magnet 62 of the holding portion 60, the lock pin 55 accommodated in the support base 53 rises, and the insertion hole 14 of the front plate 10 moves.
The tip of the lock pin 55 is inserted in the state (state shown in FIG. 8). By this operation, the lock pin 55 is set in the cassette 1.
The push latch mechanism 39 is pushed, the lock of the cassette 1 in the lock ON state is released by the push latch mechanism, and the state shifts to the lock OFF state. That is, the back plate 20 and the front plate 10 can be separated. When the cassette 1 shifts to the lock-off state, the lock pin 55 descends and is housed in the support base 53 again (state of the lock pin 55 shown in FIG. 7).

The cassette 1 is unlocked and locked O
When shifting to the FF state, the conveyance / removal unit 50 rotationally moves in the direction of arrow A6 and moves to the retracted position (for example, the position of the dotted line b)
Stop at. At this time, the tips of the grip claws 54a and 54b provided on the transport / removal unit 50 are inserted into the grip recesses 16a and 16b provided on the side surface portion 110 of the front plate, so that the front of the transport / removal unit 50 is removed. The plate 10 is fixed, and the back plate 20 and the front plate 10 are in a separable state. Therefore, the front plate 10 is retracted to the retracted position of the transport / removal unit 50 together with the transport / removal unit 50, and only the back plate 20 is held by the holding unit 60. By this operation, the back plate 20 and the front plate 10 can be completely separated. In this way, the front plate 1
The back plate 20 separated from 0 is held by the holding unit 60.

Next, the back plate 20 in the holding portion 60.
The operation of removing the (cassette 1) will be described. When the holding unit 60 including the back plate 20 that houses the stimulable phosphor sheet 28 that has finished reading the image information is returned to the position where the back plate 20 is transferred to the magnet 62 of the holding unit 60 by the moving unit 70. The transport / detachment unit 50 that has been retracted to the retracted position is again rotated and moved to the position of the dotted line c, and the back plate 20 and the front plate 10 are united. When the back plate 20 and the front plate 10 are united, the lock pin 55 housed in the support base 53 rises, and the tip of the lock pin 55 is inserted into the insertion hole 14 of the front plate 10. By this operation, the lock pin 55 presses the push latch portion 39 of the cassette 1, and the push latch mechanism causes the lock OF.
The cassette 1 that was in the F state is locked and locked O
Transition to N state. That is, the back plate 20 is fixed to the front plate 10. Cassette 1 is locked O
When shifting to the N state, the lock pin 55 descends and is housed in the support base 53 again.

When the back plate 20 is fixed to the front plate 10 and brought into the locked state, the carrying / attaching / detaching part 50 is again moved to the arrow A6.
In the direction of the arrow to the position of the dotted line b, and stops. During the rotational movement of the carrying / removing section 50, the grip claws 54a, 54b of the carrying / removing section 50 are rotated and moved while being inserted into the grip recesses 16a, 16b of the front plate side surface 110, thereby carrying the carrying / removing section 50. The detachable part 50 is the front plate 1.
It acts to remove only 0. Its front board 10
Since the lock claws of the back plate 20 are locked to the frame rear surface portion 111 and the inclined surface portion 112, which are the locking portions of the front plate 10, the front plate 10 and the back plate 20 serve as an integrated cassette 1. It is removed from the holding part 60.

Further, in the detaching operation of the cassette 1 (back plate 20) by the rotational movement of the carrying / attaching / detaching portion 50, the controller 40 detaches at a detaching speed based on the size of the cassette 1 detected by the code detector 44. Since the removal speed is controlled, the cassette 1 is not overloaded. Specifically, the larger the size of the cassette 1, the larger the load of peeling, and the longer the length of the cassette 1, the larger the load of peeling in the longitudinal direction. Therefore, the control unit 40 performs the removal speed control for reducing the load on the cassette 1 by slowing the removal speed for peeling the cassette 1 as the size of the cassette 1 is larger and longer in the peeling direction. The removal speed control is performed based on the size of the cassette 1, the length, the aspect ratio, and the like.

The back plate 2 thus attracted to the magnet 62
Since the peeling operation for removing 0 (cassette 1) is performed in accordance with the rotational movement of the conveyance / detachment unit 50, the back plate 20 can be pressed with a smaller force than in the case of peeling by parallel movement.
It is possible to remove the (cassette 1) by peeling it off from the magnet 62. Further, in the radiation image reading apparatus 100 of the present invention, the removal speed in the removal operation is controlled by the control unit 40 based on the size of the cassette 1 detected by the cassette size detection unit 44. It can be removed without taking over.

Further, the radiation image reading apparatus 1 of the present invention.
In the operation of removing the cassette 1 in 00, the carrying / attaching / detaching portion 50 acts so as to remove only the front plate 10,
This is performed by removing the front plate 10 and the back plate 20, which is locked through the locking portion and the locking claw, from the holding portion 60. That is, when the cassette 1 is detached from the holding portion 60 by the carrying / removing portion 50, the front plate 10
The frame bottom surface portion 111, the inclined surface portion 112, and the lock claws 30a, 30b, 30c, 30d, 32a, 32b, 3 of the back plate 20 locked therein.
2c and 32d, and the contacting parts and their surroundings (for example, openings 31a, 31b, 31c, 31d and 33 provided in the back plate side surface part 211 of the back plate 20).
(a, 33b, 33c, 33d, etc.), the action and force for removal are concentrated. In particular, the lock claws 32a, 32b, 32c, 32 on the side surface in the vertical direction which is the peeling direction.
The load on d increases. Also, the back plate body 21
Is designed to be flexible enough to follow the plane formed by the magnet 62 when it is attracted to the magnet 62. A load is also applied to the plate body 21.

As described above, the load is apt to appear as a deformation such as a flexure or is likely to be damaged in the portion where the force or action is concentrated or in the vicinity thereof. Therefore, on the side surface in the longitudinal (longitudinal) direction of the cassette 1 of the present invention, the lock claws are at equal points of the length of the back plate 20 in the longitudinal direction (for example, in the cassette 1 of the present embodiment, from the upper end portion). 1/2, 1/4) lock claws 32a, 32b, 32c,
Since 32d is provided, the action and force are evenly distributed, and the cassette 1 is less likely to be deformed or damaged.

As described above, by providing the lock claws on the side surfaces in the longitudinal (longitudinal) direction of the cassette 1 at equal points of the length of the back plate 20 in the longitudinal direction, the cassette 1
When the (back plate 20) is peeled off from the holding portion 60 and the lock nail or the peripheral portion thereof is detached, the action and the force as a load can be evenly distributed. In particular, as in the present embodiment, when the cassette 1 (back plate 20) is removed and peeled off along with the rotational movement of the conveyance / removal unit 50, the upper end of the cassette 1 where peeling starts The load is concentrated on the part side (outside the rotational movement).
Therefore, when a locking member such as a lock claw is provided at an equal point of the longitudinal length of the back plate 20, it is effective to provide it on the upper end side of the cassette 1.

The cassette 1 having the lock mechanism of the present invention as described above is used as the radiation image reading apparatus 100 of the present invention.
By adapting to, it is possible to perform more stable and efficient radiation image reading.

In the above embodiment, the method for detecting the size of the cassette 1 is as follows.
Although the method is based on reading the size information from the code information such as a bar code label, the present invention is not limited to this, and the cassette sandwiching portion 51 of the transporting / removing portion 50 can be used.
May be performed by detecting the holding width when the cassette 1 is held, or by detecting the shape and size of the cassette 1 by a sensor such as an optical sensor. Further, in the present embodiment, the lock claw (32a,
32b, 32c, 32d) is provided in the connecting member 35 as shown in FIG. 3, the present invention is not limited to this, and as shown in FIGS. It suffices if at least one of the connecting members 36 is provided. Also, the number of lock claws etc. is arbitrary,
In addition, it goes without saying that the specific detailed structure and the like can be appropriately changed.

[0068]

According to the first aspect of the present invention, the back member of the cassette for radiographic imaging has locked portions provided at both ends in the longitudinal direction so as to be able to move in and out from each end. A front portion of the radiographic imaging cassette is provided inside the both end portions in the longitudinal direction, the slide portion protruding from both end portions in the width direction and being provided so as to be movable in the longitudinal direction. First for locking the locked portion
Since the locking portion and the second locking portion that can be locked and unlocked by the movement of the slide members provided at both ends in the width direction are provided, the locked portion and the first locking The back member and the front member can be integrally combined or separated from each other depending on the locked state of the sliding member, the sliding portion, and the second locking portion. Therefore, if the back member and the front member are integrated, the stimulable phosphor sheet can be housed in the radiation image capturing cassette so as to prevent the damage and the like, and the back member and the front member are separated from each other. In that case, the stimulable phosphor sheet can be taken out in order to read the image information accumulated and recorded in the stimulable phosphor sheet.

According to the invention of claim 2, it is needless to say that the same effect as that of the invention of claim 1 can be obtained. In particular, the locked portion is the first connection provided with the rack portion. The first connecting member and the second connecting member are respectively provided on the member and the second connecting member, and the first connecting member and the second connecting member operate in the opposite directions by the pinions that mesh with the rack portion,
The locked portions provided on the first connecting member and the locked portions provided on the second connecting member are moved in and out from the respective ends. Therefore, it is possible to perform interlocking locking and unlocking by the locked portion and the first locking portion at both ends in the longitudinal direction of the radiographic imaging cassette.

According to the invention of claim 3, it is needless to say that the same effect as that of the invention of claim 2 can be obtained. In particular, at least one of the first connecting member and the second connecting member is obtained. Since the slide part is provided in the slide part, the slide part can perform an operation linked with the locked part by the operation of the rack and the pinion. Therefore, at both ends in the longitudinal direction of the radiation image capturing cassette, the locked and unlocked portions are locked and unlocked by the first locking portion, and at the both ends in the width direction of the radiation image capturing cassette, slide portions are formed. Locking and unlocking by the first locking portion can be performed in conjunction with each other.
That is, the locking and unlocking of the four sides of the radiation image capturing cassette can be performed in conjunction with each other.

According to the invention described in claim 4, it is needless to say that the same effect as that of the invention described in claim 3 can be obtained, and in particular, the sliding portion is substantially equal to the longitudinal length of the back member. Since the points are provided, it is possible to evenly disperse the force applied to both end portions in the width direction of the radiation image capturing cassette. Therefore, for example, when a force or action that separates the front member and the back member, which are integrated as a radiographic image capturing cassette, is applied, the force and action are evenly distributed, and a part of the radiographic image capturing cassette is used. It is possible to prevent the concentration of force and action on, and to prevent damage or deformation of that portion.

According to the invention described in claim 5,
It is needless to say that the same effect as that of the invention described in any one of 4) can be obtained, in particular, the first and second connecting members are operated by the push latch mechanism, and the locked members provided on the respective connecting members are locked. Since the movement of the slide portion and the movement of the portion can be switched, it is possible to switch between locking and non-locking by a plurality of locked portions, a plurality of sliding portions, etc. by one operation of the push latch mechanism. Therefore, it is possible to easily combine the front member and the back member into one body or separate the front member and the separate body with one operation.

According to the sixth aspect of the invention, the radiation image detected by the detecting means when the removing means removes the back member from the holding means for holding the back member provided with the magnetic portion having magnetism by magnetic force. Since the removal speed control means controls the removal speed by the removal means based on the size of the imaging cassette, the back member removal operation can be performed according to the size of the radiation image capturing cassette. That is, when the front member of the cassette for radiographic imaging is grasped and the back member integrally fixed via the locking portion, the locked portion, etc. is removed from the holding means, those locking portion, locked portion However, the load can be reduced by controlling the removal speed by the removal speed control means. In particular, when the size of the radiation image capturing cassette is large, or the radiation image capturing cassette has a long shape, and the load for removing the back member of the cassette is large,
By controlling the removal speed by the removal speed control means, the removal means can perform an appropriate removal operation.

[Brief description of drawings]

FIG. 1 is a perspective view of a cassette for radiographic imaging according to the present invention when a front plate and a back plate are separated.

FIG. 2 is a schematic view of a cross section when the front plate and the back plate of the radiation image capturing cassette according to the present invention are integrated.

FIG. 3 is an explanatory view of a lock mechanism on a front plate and a back plate of the radiation image capturing cassette according to the present invention.

FIG. 4 is an explanatory diagram of a locked state of a front plate and a back plate of the radiation image capturing cassette according to the present invention.

FIG. 5 is a sectional view schematically showing a radiation image reading apparatus according to the present invention.

FIG. 6 is a block diagram showing a main configuration of a radiation image reading apparatus according to the present invention.

FIG. 7 is an enlarged view of the vicinity of the carrying / demounting unit and the holding unit of the radiation image reading apparatus according to the present invention.

FIG. 8 is a perspective view showing a relationship among a cassette, a conveyance / removal unit, a holding unit, and a moving unit.

FIG. 9 is a flowchart showing removal speed control in the control unit of the radiation image reading apparatus according to the present invention.

FIG. 10 is an explanatory diagram of a second form of a lock mechanism for a front plate and a back plate of the radiation image capturing cassette according to the present invention.

FIG. 11 is an explanatory diagram of a third form of a lock mechanism for a front plate and a back plate of the radiation image capturing cassette according to the present invention.

FIG. 12 is an explanatory diagram of a fourth mode of the lock mechanism for the front plate and the back plate of the cassette for radiographic imaging according to the present invention.

[Explanation of symbols]

1 Radiographic Imaging Cassette (Cassette) 10 Front Plate (Front Member) 15a, 15b, 15c, 15d Notches (Second Locking Part) 20 Back Plate (Back Member) 21 Back Plate Main Body (Magnetic Part) 28 Photostimulability Phosphor sheet 30a, 30b, 30c, 30d Lock claw (locked part) 32a, 32b, 32c, 32d Lock claw (slide part) 35 First connecting member 35B Rack part 36 Second connecting member 36B Rack part 37 Pinion 38b Spring (push latch mechanism) 39 Push latch part (push latch mechanism) 40 Control part (removal speed control means) 44 Code detection part (detection means) 50 Conveyance / detachment part (removal means) 60 Holding part (holding means) 62 magnet 70 moving part 80 reading part 90 erasing part 100 radiation image reading device 111 Over arm rear panel (first engagement portion, second locking portion) 112 inclined surface (first engaging portion, the second engaging portion)

Claims (6)

[Claims] 1. A cassette for radiographic imaging, comprising: a radiation-incident side front member; a back member facing the front member; and a photostimulable phosphor sheet housed in the back member. Is a locked portion that is provided at both ends in the longitudinal direction so as to be able to move in and out from each end, and a slide portion that protrudes from both ends in the width direction and that is provided so as to be movable in the longitudinal direction, respectively. The front member is provided inside the both end portions in the longitudinal direction, and the first engaging portion for engaging the engaged portion, and the both end portions in the width direction are provided by the movement of the slide portion. A cassette for radiation image capturing, comprising: a second locking part capable of locking and unlocking the slide part. 2. The cassette for radiographic imaging according to claim 1, wherein the back member includes a pinion, a rack portion that meshes with the pinion, and the locked portion, and the rotation of the pinion A first connecting member that moves in the longitudinal direction to allow the locked portion to move in and out of one longitudinal direction end portion, a rack portion that meshes with the pinion, and the locked portion are provided. A second connecting member that moves in a direction opposite to the first connecting member by rotation and the locked portion moves in and out of the other longitudinal end portion; Cassette. 3. The cassette for radiographic imaging according to claim 2, wherein at least one of the first connecting member and the second connecting member is provided with the slide portion. Cassette. 4. The cassette for radiographic imaging according to claim 3, wherein the slide portion is provided at substantially equal points of a longitudinal length of the back member. Cassette. 5. The cassette for radiographic imaging according to claim 2, wherein the first connecting member and the second connecting member are operated by a push latch mechanism, and the first connecting member is operated. A cassette for radiographic imaging, characterized in that entrance and exit of the locked portion provided in the member and the second connecting member from the end in the longitudinal direction and movement of the slide portion can be switched. 6. A radiation image reading device for reading a radiation image from a stimulable phosphor sheet provided in the radiation image capturing cassette according to claim 1, wherein the radiation image capturing cassette is used. Is a magnetic member having magnetism provided on the back member, a magnetic means for detecting the size of the radiation image capturing cassette and the magnetic portion of the back member of the radiation image capturing cassette. Holding means for holding the front member of the cassette for radiation image capturing, the removing member for removing the back member held by the holding means from the holding means, and the radiation detected by the detecting means. Based on the size of the image-taking cassette, a detachment speed control means for controlling the detachment speed by the detaching means is provided. The radiation image reading apparatus characterized by obtaining.