JPH0670705B2 - Recording medium transport positioning device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium conveying and positioning apparatus in a radiation imaging apparatus, and more specifically, in a so-called upright-type radiation imaging apparatus, a recording medium imaging unit. The present invention relates to a recording / medium conveying / positioning device which is capable of smoothly feeding a recording medium and fixing the recording medium at a fixed position to surely convey the photographed recording medium to a subsequent radiation image information reading device.

[Prior Art] An upright radiation imaging apparatus captures a radiation image of a subject in a substantially upright state. In a conventional upright radiation imaging apparatus, the radiation image is supplied to a predetermined position. The X-ray films are separated one by one and conveyed by the rollers or endless belts to the tip surface of the photographing section, which is projected from the photographing apparatus main body, that is, the photographing surface, and a pair of intensifying screens fixed at this position. It was inserted between them, positioned, and photographed.

However, in such a conventional standing-type radiation imaging apparatus, the X-ray film is small by a roller or an endless belt particularly in a portion conveyed from the imaging apparatus main body to the imaging unit and a portion inserted between a pair of intensifying screens. Since the X-ray film is bent with a radius of curvature to be conveyed, a strong bending force is applied to the X-ray film, which is not preferable.

In addition, since it is necessary to provide rollers and endless belts near the upper and lower portions of the photographing unit for transporting the X-ray film from the photographing apparatus main body to the photographing surface of the photographing unit, and for withdrawing from the photographing surface after photographing, As a result, the shooting department had to be large.

Also, a chin rest for standing upright shooting is provided on the outer upper end of the shooting unit, but since rollers and endless belts are provided on the upper inside of the shooting unit as described above, the chin rest can be moved to the shooting position. There is also a problem that the distance to a certain X-ray film becomes long, the effective photographing range is limited, and the region that can be photographed is limited.

In recent years, radiation image information is once stored in a sheet made of a so-called stimulable phosphor, and then the stimulable phosphor sheet is scanned and excited with a laser beam to emit the radiation image information in the form of stimulated emission light. , A system for reproducing a radiation image based on an electric signal obtained by photoelectrically reading the same has been proposed (US Pat. Nos. 4,258,264 and 4,276,473).
No., No. 4,315,318, etc.).

The stimulable phosphor used in this radiation image information recording / reproducing system is a temporary recording medium for temporarily storing radiation image information, and the radiation energy remaining after reading the radiation image information is recorded, for example, in Japanese Patent Laid-Open No. −11392
It can be repeatedly used by releasing it by the method shown in No. 56-12599 and the like.

Therefore, in the standing radiation imaging apparatus in the radiation image information recording / reproducing system, the radiation image information reading means accumulated in the stimulable phosphor sheet and the residual radiation energy in the stimulable phosphor sheet are emitted. A radiation image information recording / reading device including erasing means,
It is desirable that the stimulable phosphor sheet, which is a temporary recording medium, can be circulated and reused in the apparatus.

[Problems to be Solved by the Invention] However, when the standing radiation image information recording / reading apparatus is configured so that the stimulable phosphor sheet can be circulatively reused as described above, the stimulable phosphor sheet is Since the thickness is larger than the X-ray film and the rigidity is extremely high, applying a strong bending force to the stimulable phosphor sheet is
This is a particularly greater problem than when dealing with linear film. Further, unlike the X-ray film, the stimulable phosphor sheet is repeatedly used, so that the bending problem is very important.

Since the present invention has been made in view of the above circumstances, it is possible to reliably convey and position the sheet-shaped recording medium to the photographing position without applying a strong bending force to the sheet-shaped recording medium with a simple mechanism. An object of the present invention is to provide a conveyance positioning device for a recording medium in which a region that can be photographed is not limited.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and is a member for sandwiching and transporting a recording medium between them for positioning, and extending in the vertical direction. A sandwiching member having a first plate body present and a second plate body provided at a position facing the first plate body, and a sandwiching member of the sandwiching member at a receiving position of a transport system for transporting a recording medium. At least the end portion is expanded and held, and after the sandwiching member receives the recording medium, the sandwiching member is displaced in a direction substantially orthogonal to the conveying direction of the recording medium, and the sandwiching member is moved to the recording position of the recording medium. And a positioning means for displacing the holding member after photographing to eject the recording medium to the outside of the holding member.

In the present invention, the recording medium refers to a sheet-like material capable of temporarily or permanently accumulating and recording radiation image information, which is composed of an X-ray photographic film and an intensifying screen,
Includes a stimulable phosphor sheet.

[Operation] While the recording medium is held in the vertical state by the first plate body and the second plate body that form the holding member, the recording medium is transferred to the imaging table,
Next, after photographing the recording medium in a substantially vertical state, the recording medium is again displaced in a vertical state so as to be faced with conveyance, etc., and the first plate body and the second plate body are separated from each other. ,
Eject the recording medium.

[Embodiment] With reference to the accompanying drawings, a transport medium positioning apparatus for a recording medium according to the present invention will be described in detail with reference to a preferred embodiment in a state of being incorporated in a radiation image information recording / reading apparatus.

In FIG. 1, reference numeral 10 indicates an upright type radiation image information recording / reading apparatus. The apparatus 10 includes a first housing 12 extending vertically and a second housing 14 extending horizontally. including. An imaging unit 16 is arranged above the front surface of the first housing 12, and an operation unit 18 is arranged above the side wall of the imaging unit 16.

Next, with reference to FIG. 2, the internal structure of the first housing 12 and the second housing 14 will be described. A pair of receiving roller pairs 20 that are slightly offset from the vertical direction and are in pressure contact with each other are disposed below the image capturing unit 16, and a first guide member 22 that inclines below the roller pair 20 and this guide are provided. A second guide member (24) is arranged opposite to the member (22) and extends vertically. A pair of roller pairs 26 is further provided below the first and second guide members 22 and 24, and is long below the roller pairs 26, but slightly longer than the length of a stimulable phosphor sheet described later. A shorter third guide member 28 is provided. A roller pair 32 is pivotally supported between the third guide member 28 and a fourth guide member 30 provided below the third guide member 28. A roller pair 34 is provided below the fourth guide member 30.

Next, below the roller pair 34, an endless first conveyor belt 36 that bends at an internal corner of the first housing 12 is provided. In this case, a first roller group 38 composed of three rollers is arranged at the bent portion of the conveyor belt 36 as shown in the drawing, and a fifth guide member 40 is provided above the first roller group 38. Is provided. The conveyor belt 36 terminates in the lower central portion of the second housing 14.

Next, the endless second conveyor belt 42 is disposed slightly apart from the end portion of the first conveyor belt 36. The second conveyor belt 42 is bent at the corner portion of the second housing 14 so as to be directed upward, and is further bent at the inner bent portion thereof.
A second roller group 44 consisting of individual rollers is provided. Further, a pair of endless third conveyor belts 46 and fourth conveyor belts 48 extend in the horizontal direction at a distance from the end of the conveyor belt 42. The third conveyor belt 46 and the fourth conveyor belt 48 are arranged at a predetermined distance from each other,
A small-diameter roller 50 is rotatably arranged in the space. The rollers 52 and 54 located on the upper surfaces of the conveyor belts 46 and 48 perform a pressing function for securely holding the stimulable phosphor sheet conveyed together with the small diameter roller 50. An endless fifth belt 56 that bends further upward is provided near the end of the fourth conveyor belt 48. A third roller group 58 including three rollers is provided on one surface of the belt 56.

Above the fifth conveyor belt 56 and the third roller group 58, a set of facing fifth guide members 60 is disposed, and above the fifth guide member 60, a pair of pairs is installed. A sixth guide member 64 is arranged via the roller pair 62. Second
As can be seen from the figure, the sixth guide member 64 is configured to be shorter than the fifth guide member 60, and a seventh guide member 66 is further arranged above the sixth guide member 64. There is. The seventh guide member 66 is arranged in association with roller pairs 68 and 70 arranged above and below the seventh guide member 66, respectively. That is, it is important that the distance between the roller pair 68 and the roller pair 70 is slightly shorter than the vertical length of the stimulable phosphor sheet to be conveyed.

By the way, a pair of roller pairs 74 is disposed above the rollers 70 via a shorter eighth guide member 72, and the pair of rollers 74 is disposed between the roller pair 74 and the conveying belt 76 of the next stage. A ninth guide member 78 having substantially the same length as the fifth guide member 60 is provided.

At the end portion of the ninth guide member 78, the endless conveyor belt 76 is provided which is close to the ninth guide member 78 and is bent and arranged as described above. The transport belt 76 is located substantially at the top of the first housing 12, as can be seen from the figure. Conveyor belt due to the bending structure as described above
Inside the 76, a fourth roller group 80 composed of six rollers and arranged on the substantially same circumference is provided.

A pair of roller pairs 82 and 84 are provided below the conveyor belt 76 and the fourth roller group 80.

The above is the basic configuration of the transport system for the stimulable phosphor sheet in the radiation image recording / reading apparatus 10. Next, the reading unit, the erasing unit, and the photographing unit arranged in relation to this will be described.

First, the reading unit 86 will be described. The reading unit 86 is basically a laser light source 88, a scanning optical system (not shown) including a galvanometer mirror for scanning the sheet with laser light derived from the laser light source 88, and a converging reflection mirror 90. And a condenser optical element 92 for effectively condensing a part of the stimulated emission light emitted from the sheet by the scanning laser light and the stimulated emission light reflected by the reflection mirror 90. It should be noted that the photo-mark
94 is installed.

Next, the erasing unit 96 will be described. The erasing section 96 has a housing 98 opposite to the guide member 66, and a large number of light sources, for example, an erasing lamp group 100 including fluorescent lamps is included in the housing 98. The housing 98, the lower end sheet inlet of the guide member 66 and the upper end sheet outlet and the roller pair 68, so that the light from the erasing lamp group 100 does not adversely affect the photographed stimulable phosphor sheet. It is preferable to dispose light shielding members 102 and 104 surrounding the 70.

Therefore, the photographing unit will be described below with reference to FIGS. 2 and 3.

First, a pair of plate bodies 108a and 108b are fixedly installed in the internal space 106 of the imaging unit 16 that is bulged from the first housing 12 with a predetermined gap therebetween. A notch 11 is provided at the upper front end of each of the plates 108a and 108b.
0a and 110b are engraved, and elongated holes 112a and 112b extending in the lateral direction are formed below them. Further, the long hole 112a,
Substantially rectangular holes 114a and 114b are provided below 112b, respectively.

Therefore, another set of a first plate body 116 and a second plate body 118 made of carbon fiber reinforced plastic is disposed in the space between the pair of plate bodies 108a and 108b. In this case, the plates 116 and 118 are only required to uniformly transmit radiation, and for example, a plastic plate, an aluminum plate or the like is preferably used. Further, it is preferable that a foamed polyethylene is stuck on the surface portion of these plates in order to suitably introduce, position and discharge the stimulable phosphor sheet described later. Further, it is possible to attach a lead plate to the second plate 118, and in this case, the scattering of radiation can be effectively prevented. Both upper ends of the plate body 116 are bent and the plate bodies 108a and 108b are inserted through the notches 110a and 110b.
The tongue pieces 120a, 120b are formed in the vicinity of the lower end portion of the plate body 116 while being pivotally supported by the upper end portion of the tongue piece 120a.
120b extends to the outside of the plate bodies 108a, 108b through the holes 114a, 114b.

The plate body 116 configured as described above has the shaft 122 at the lower end.
The upper end portion is engaged with the plate body 118 via the so as to be openable and closable. That is, although not shown, a gap is provided between the plate body 116 and the plate body 118 so that a stimulable phosphor sheet, which will be described later, can pass therethrough, and the gap can be closed by the lower lid 124. is there. The lower lid 124 is a plate
The outer portions of 108a and 108b are connected to a lower lid arm 126, and the lower lid arm 126 has slots 112a and 112 at its upper portion.
It is displaceably held by a shaft 128 sliding on b. A tongue piece 130 is provided on the upper end of the lower lid arm 126.
130 is configured to engage with the lower lid opening / closing pin 132 protruding outward from the plate bodies 108a and 108b during the movement in the direction of arrow A (see FIG. 3). A hole is formed in the lower lid arm 126 below the shaft 128, and one end of the wire 134 is bonded to the hole, while the other end of the wire 134 is pin 1
The coil spring 138 is connected to the coil spring 138 via the pin 36, and the end of the coil spring 138 is a pin 140 provided on the plate 108a
Is tied up to.

Next, one end of the first crank arm 142 is pivotally supported on the shaft 128 outside the lower lid arm 126. On the other hand, the other end of the first crank arm 142 is connected to one end of a second crank arm 146 via a shaft 144, and the other end of the crank arm 146 is connected to a first sprocket via a shaft 148 '. It is connected to 148. The first sprocket 148 is pivotally supported by the plate 108a, and the chain 150 that meshes with the first sprocket 148 also meshes with a second sprocket 152 that is directly connected to the drive shaft of a drive motor (not shown). There is.

Although description is omitted, it goes without saying that a mechanism similar to the above is incorporated in the plate 108b side.

Next, its operation and effect will be described.

The stimulable phosphor sheet 154 from which the radiation image information accumulated until then is erased by the erasing lamp group 100 arranged in the erasing unit 96 is a conveyor belt that bends via the roller pair (70, 74) and the guide member 78. 76 and roller group 80. That is, the sheet 154 is nipped by the conveyor belt 76 and the roller group 80 and curved, and then reaches the roller pair 82, 84. At this time, if the first sensor 156 is provided between the roller pair 82 and the roller pair 84 as shown in FIG. 2, the arrival of the sheet 154 can be easily confirmed. Then, a motor (not shown) is driven and rotated to displace the plate 118 to the position shown in FIG. 4A under the action of the cranks 142, 146 and the coil spring 138. That is, the plate bodies 116 and 118 are in a state where the upper ends of the plate bodies 116 and 118 are expanded with the shaft 122 as an axis. At this time, the lower lid 124 is in a closed state. In this state, the stimulable phosphor sheet 154 is dropped and supplied to the sandwiching member composed of the plates 116 and 118, and the sheet 154 is locked to the lower lid 124 from above.

Then, a motor (not shown) is further driven, whereby the precursor cranks 142 and 146 are extended and the plates 116 and 118 are brought to the closest state to be stationary. That is, the sheet 154 held by the lower lid 124 faces the photographing surface 158 via the thin plate 116, and the sheet 154 locked by the lower lid 124 is the plates 116 and 1.
It is clamped by 18 and is firmly positioned here (see FIG. 4B). In this positioning, the plate 11
The foamed polyethylene adhered to 6, 118 works well. That is, the soft surface contacts the sheet 154 with an appropriate coefficient of friction and does not damage the surface.

A radiation image is projected on the stimulable phosphor sheet 154 by irradiating a subject (not shown) with radiation at such a position.

When the photographing is completed, the motor in the stationary state is driven again to move the plates 116 and 118 to the positions shown in FIG.
Change to the position of. At this time, the pin 132 is the lower lid arm 126.
This lower lid arm 126 is attached to the shaft 128 to abut the tongue 130 of the
Rotate through. That is, since the lower lid 124 that closes the lower end opening portions of the plate members 116 and 118 is opened, the photographed sheet 154 falls downward and is caught by the roller pair 20. If the second sensor 160 is provided between the roller pair 20 and the roller pair 26, the fall can be easily detected.

Next, the photographed sheet 154 is conveyed to the reading unit 86 via the guide member 28, the roller pair 32, etc., scanned by the laser light from the light source 88, read by the condensing optical element 92, and image information of the subject is obtained. .

Next, another embodiment of the recording medium conveying / positioning device according to the present invention is shown in FIGS. In this case, the same reference numerals as those in the above-mentioned embodiment indicate the same constituent elements.

In this example, the chain 150, sprockets 148, 152
The second crank arm 146 is directly connected to the eccentric drive shaft of the motor 162 without adopting.

In this embodiment, the motor 162 is driven to drive the crank 1
Under the action of 42 and 146, the plate body 118 is displaced to the position shown in FIG. 5A. That is, the upper end of the plate 118 has the crank 142,
Under the action of 146, the roller pair 84 is displaced right below the right roller of the roller pair 84 in FIG. 5A. Therefore, the roller pair 84
The sheet 154 that passes through slides on the inner surface of the plate 118, and the lower lid 12
Locked in 4. At this time, the lower lid 124 is always urged by a spring (not shown) so as to be in a closed state, and therefore the lower lid 124 does not contact the pin 132 but bends to form the plate body 116 and the plate body. The lower end of 118 is held in a closed state.

When the motor 162 continues to rotate, the plate 118 moves to the crank 14
Under the action of 2 and 146, the plate 118 is moved and displaced in the direction of the photographing surface 158, and the plate 118 is also moved while pressing the plate 116. Therefore, the stimulable phosphor sheet 154, the lower end of which is held by the lower lid 124, is moved and displaced while being sandwiched by the plates 116 and 118, and faces the photographing surface 158 through the thin plate 116. Will be done (Fig. 5B
reference). Photographing is performed in this state.

During photography, the motor 162, which was in a stationary state, is driven again when photography is completed, and the crank arms 142 and 146 operate to move the plates 116 and 118 to the position shown in FIG. 5C. That is, the rotation of the motor 162 raises the end of the crank arm 146 to the uppermost point and directs it further downward.
The crank arm 142 is separated from the proximity point of the photographing surface 158. This means that the plate 118 is also swung to be separated from the photographing surface 158. Eventually, the upper ends of the plate bodies 116 and 118 are opened, and the lower lid 124 that locks the lower end portions of the two plate bodies 116 and 118 contacts the pin 132. Therefore, the pin 132 is further swung by the plate body 118 with one end thereof being blocked by the lower lid 124, so that the pin 132 shown in FIG.
As shown in FIG. 3, the bent portion is opened, and as a result, a gap substantially enough for the sheet 154 to pass is defined between the plate bodies 116 and 118, and the photographed sheet 154 falls. The sheet 154 thus dropped is urged by the roller pair 20 as described above.

By the way, as described above, the motor 162 continues to rotate even after the discharge of the sheet 154 is completed.
8 returns to the position shown in FIG. 5A and waits for the insertion of the next sheet 154. The photographed sheet 154 is conveyed to the reading unit 86, the erasing unit 96 and the like as described above.

Furthermore, another embodiment of the conveying / positioning device for the photographing medium according to the present invention is shown in FIGS. 6A to 6F. Also in this case, the same reference numerals as those in the above-mentioned embodiment indicate the same components.

Therefore, in this embodiment, the chain sprocket and the coil spring are adopted. That is, one end of the coil spring 170 is engaged with the end of the substantially central portion of the side of the plate 116, and the guide member 172 is attached to the lower end of the plate 116. A bar 174 fixed to the lower end of the plate 116 is slidably arranged inside the guide member 172. On the other hand, a shaft 176 is arranged on the plate 118 and is engaged with a chain (not shown). This chain is displaced by a sprocket (not shown).

6A, the plate member 116 and the plate member 118 are close to the photographing surface (not shown). Therefore, the plate member 116 and the plate member 118 are sandwiched between the two plate members 116 and 118. Sheet 154
When the radiation image is projected on the sheet, the apparatus shifts to the discharging operation of the sheet 154. Then, the shaft 176 is displaced to move the plate 118.
When is moved in parallel, the plate body 116 also moves to the coil spring 170.
And swings to reach the position shown in FIG. 6B. At this time,
The rod 174 slides inside the guide member 172.

Then, when the plate body 118 is further displaced, the pin 132 comes into contact with the lower lid arm 126 (see FIG. 6C), so that the lower lid 124 which has been closed by the spring (not shown) is opened in the same manner as described above. The lid is closed and the photographed sheet 154 falls (see FIG. 6D). After discharging the sheet 154, the coil spring 170 once moves the plates 116 and 118 to the position shown in FIG. 6E. At this position, the lower lid 124 is returned to the original state, that is, the closed state by the spring (not shown). If the next sheet 154 is inserted in this state and the plates 116 and 118 are further moved, each plate returns to the position shown in FIG. 6F and waits for the next photographing operation.

Yet another embodiment is shown in FIGS. 7A-E. Also in this embodiment, the same reference numerals as those in the above-mentioned embodiment indicate the same constituent elements.

Therefore, in this embodiment, guide members 180 for guiding both ends of the sheet 154 in the falling direction are provided between the plate body 116 and the plate body 118,
Further, a coil spring is provided between the plate body 116 and the plate body 118.
182 is arranged. That is, the coil spring 1
Reference numeral 82 always urges both plate members 116 and 118 so as to be close to each other. In this case, the plates 116 and 118 are held substantially vertically and in parallel.

When the photographing is completed under such a configuration (see FIG. 7A), the first and second plate members 116 and 118 are separated from the photographing surface 158 by a wire, a crank, a parallel link or the like not shown, The position shown in FIG. B is reached. Next, the plate 11
Only 8 is pulled against the coil spring 182 and the plate 11
6 and the plate 118 are separated from each other, and when the pin 132 abuts the lower lid arm 126, the lower lid 124 is opened and the photographed sheet 154 is discharged along the guide member 180 in the same manner as described above, and then the pair of rollers 84 is discharged. On the other hand, a roller pair that is offset slightly inward in the vertical direction
It is sent to the next step via 20 (see FIG. 7C). At this time,
A means for pulling the plate 118 away from the plate 116, for example, a lower lid arm 126 that is disengaged from the pin 132 when the wire is relaxed and slightly returned to the imaging plane 158 by the coil spring 182. Returns to its original state, and its lower end is closed between the guide member 180 and the plate 118 (7th
(See Figure D). Therefore, if the next sheet 154 'is inserted in the vertical state and the plates 116 and 118 are brought close to each other, it is possible to wait for the next photographing operation (see FIG. 7E).

Although the present invention has been described above using the stimulable phosphor sheet as the recording medium, it is also possible to use an X-ray film as the recording medium. In this case, an intensifying screen must be provided on each of the first plate body and the second plate body of the holding member for holding the X-ray film so that the X-ray film is held from both sides thereof.

Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.

[Advantages of the Invention] According to the present invention, the recording material can be brought as close to the photographing surface as possible with the simple structure as described above, and at that time, the recording medium has a receiving position by the plate body, a photographing position, The vertical state is maintained at any of the discharge positions. Therefore, it is possible to obtain radiographic image information with high imaging accuracy without applying a stress that causes the recording medium to be bent flexibly. Moreover, its mechanical structure ensures reliable operation,
Further, it is possible to obtain a substantial effect such as easy incorporation into the photographing unit.

[Brief description of drawings]

FIG. 1 is an external perspective view of a standing radiation image information recording / reading apparatus in which the apparatus of the present invention is incorporated, and FIG. 2 is an apparatus of the present invention and an imaging unit, a reading unit, and an erasing unit of the radiation image information recording / reading apparatus. 3 is a perspective view showing an embodiment of the device of the present invention, FIG. 4 is an operation explanatory view of the embodiment shown in FIG. 3, and FIG. FIG. 6 is an explanatory view showing the operation of another embodiment of the present invention device, FIG. 6 is an explanatory view showing the operation principle of another embodiment of the present invention device, and FIG. 7 is another embodiment of the present invention device. FIG. 3 is an explanatory diagram showing the operating principle of FIG. In FIG. 4 to FIG. 7, the solid circle indicates that it is fixed, and the open circle indicates that it is movable. 20, 26 …… Roller pair, 82,84 …… Roller pair 86 …… Reading section, 88 …… Laser light source 92 …… Condensing optical element, 96 …… Erase section 100 …… Erase lamp group, 106 …… Space 108 …… plate, 110 …… notch 112 …… long hole, 114 …… hole 116 …… first plate, 118 …… second plate 124 …… lower lid, 126 …… lower lid arm 132 …… Lower lid open / close pin, 134 …… Wire 138 …… Coil spring 142,146 …… Crank arm 154,154 ′ …… Storable phosphor sheet 158 …… Shooting surface 162 …… Motor 170 …… Coil spring 172 …… Guide member, 180 ... Guide member 182 ... Coil spring

Claims (1)

[Claims] 1. A member for sandwiching and transporting a recording medium between them for positioning, which is provided at a first plate member extending in a vertical direction and at a position facing the first plate member. A holding member having a second plate body, and at least an end portion of the holding member is expanded and held at a receiving position of a conveying system that conveys the recording medium, and the holding member receives the recording medium. , Displacing the sandwiching member in a direction substantially orthogonal to the conveying direction of the recording medium, positioning the sandwiching member in a vertical state to the photographing position of the recording medium, and after photographing, displacing the sandwiching member to perform the recording. A recording medium conveyance / positioning device comprising: a positioning unit that ejects the medium to the outside of the holding member.