JPH0522880Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a screen for a Weissenberg camera.

[Prior Art] A Weissenberg camera photographs the reciprocal lattice of a single crystal sample on film, and is used to determine the unit cell and symmetry of the crystal.

FIG. 3 shows the basic configuration of the Weissenberg camera.

As shown in this figure, the Weissenberg camera consists of a cylindrical film 1, a sample support device 3 that supports a crystal sample 2 on the central axis of the cylinder formed by the film 1, and a structure in which the film 1 and the sample 2 are connected together. It consists of a cylindrical screen 4 interposed therebetween, and an X-ray generator (not shown) that irradiates X-rays 5 onto the sample 2 from the radial direction of the film 1.

The film 1 is not a perfect cylinder, but has a spaced part 1a for allowing the incident X-rays 5 to reach the sample 2.
However, it is provided.

The sample support device 3 includes a sample rotation mechanism 3a that rotates the sample 2 with the center axis of the cylindrical film 1 as a rotation axis, and a sample rotation mechanism 3a that rotates the sample 2 in the direction of the center axis of the cylinder in conjunction with the rotation of the sample 2 at a constant speed. By changing the rotation direction of a drive source 3c such as a motor, the rotation direction of the sample 2 and the movement direction of the film 1 (indicated by arrows in the figure) can be reversed. Can be switched.

The screen 4 is formed into a cylindrical shape by a member that blocks X-rays, and has an outer dimension slightly smaller than an inner diameter dimension of the film 1.
The peripheral wall has an elongated window 4a along the central axis.
and a slit 4b extending in the circumferential direction are open. Here, the window 4a is for passing the incident X-rays 5, and the slit 4b is for transmitting only the diffraction lines of a specific layer to the film 1 among the diffraction lines that appear in a large number of layers due to X-ray irradiation. It is meant to reach.

Now, in the Weissenberg camera explained above, among the diffraction lines of many layers, the slit 4b
This allows only the diffraction lines of one layer to reach the film 1 and record them. Therefore, if you want to record multiple layers, the slit 4 for sample 2 is changed each time recording for one layer is completed.
This has the disadvantage that the same processing must be repeated by changing the position of b, which increases the processing time (photographing time).

Therefore, for example, this method is inappropriate when the sample 2 is an unstable crystal such as a protein crystal and it is necessary to record data for a large number of layers in a short period of time.

Therefore, it was proposed to provide the screen 4 with a plurality of slits 4b in order to record more data in a shorter time.

[Problem to be solved by the invention] However, the spacing between the layers of the diffraction lines generated from the sample 2 varies depending on the lattice constant of the sample 2, for example, the larger the lattice constant, the narrower the spacing between the layers. Therefore, even if a plurality of slits are provided, a screen in which the distance between the slits is fixed has low utility value.

Therefore, it is possible to make the distance between the slits variable, but in order to realize a screen with such a function, there are many issues such as cost, accuracy, etc.
Achieving this will not be easy as it involves various issues such as productivity.

This idea was proposed against this background, and by adopting a configuration in which the screen has multiple slits, even when the sample is an unstable crystal such as a protein, it can be processed in a short time. It is possible to record data on the diffraction lines of many layers at the same time, and the spacing between the slits can be adjusted to match the lattice constant of the sample, making it suitable for various samples with different lattice constants. The purpose of the present invention is to provide a screen for a Weissenberg camera that has high utility value, such as being able to be used as a slit, and that does not require expensive drive parts for the mechanism for changing the spacing between the slits, and that can be produced at low cost. do.

[Means for solving the problem] The screen of the Weissenberg camera according to this invention uses a link mechanism as a means for adjusting the distance between the slits on the screen. a screen body comprising a plurality of photographing cylinders arranged in the axial direction of the cylinders each having a slit for allowing only the diffraction rays of the layers to reach the film; and an interval adjustment means for setting the distance between the photographing cylinders. The interval adjustment means includes: a plurality of rotary links provided for each photographing cylinder and transmitting a moving force in the axial direction of the cylinder to the photographing cylinder by rotation; and these rotary links. A parallel link mechanism in which a plurality of parallel movement nodes provided corresponding to the above are moved in parallel in the axial direction of the cylinder by the rotational movement of connecting nodes that connect these parallel movement nodes at predetermined intervals. , and a plurality of movement amount setting pieces for transmitting the movement of each parallel movement node of the parallel link mechanism to a corresponding rotation link, and each rotation link is configured to move along the central axis of the cylinder through the support position of the sample. Each of the movement amount setting pieces includes a first slider portion that is slidable on the rotation link, and a fixed radius around the rotation axis of the rotation link. It is characterized by integrating a movement restricting part whose movement is restricted on a circular arc and a second slider part which is slidable on a parallel movement node.

[Function] In the screen of the Weissenberg camera according to this invention, the screen body is composed of a plurality of photographing cylinders, and each photographing cylinder is provided with a slit, so that diffraction lines of multiple layers can be photographed simultaneously. Even when the sample is an unstable crystal such as a protein, data on diffraction lines of many layers can be recorded in a short time.

Furthermore, by adjusting the distance between the imaging cylinders using the distance adjustment means, the distance between the slits can be matched to the distance corresponding to the lattice constant of the sample, so it is possible to adjust the distance between the slits to the distance corresponding to the lattice constant of the sample. It also has high utility value as it can be used against other people.

Further, the interval adjustment means is a combination of link mechanisms, and when a rotational motion is applied to the connecting nodes of the parallel link mechanism, each parallel moving node moves in parallel, thereby moving the movement amount setting piece to the rotating link. move on an arc of constant radius centered on the axis of rotation. Each rotary link rotates with the movement of each movement amount setting piece, and the distance between the slits is adjusted by the movement of the photography cylinder accompanying the rotation of this rotary link. In this way, the means for changing the spacing between the slits is constructed by a combination of link mechanisms, and does not require expensive drive parts such as high-performance stepping motors, so manufacturing costs can be kept low. You can also do it.

[Embodiment] FIG. 1 shows an embodiment of the screen of a Weissenberg camera according to the present invention.

This screen is composed of a screen body 10 and a distance adjusting means 11 attached to the outside of the screen body 10.

The screen body 10 captures only the diffraction lines of the layer to be photographed on the film (see reference numeral 1 in FIG. 3).
A plurality of imaging cylinders 12a, 12b, . . . 12g having slits Sa, Sb, . They are connected by telescopic cylinders 13, and have a substantially cylindrical shape as a whole. These imaging cylinders 12a to 12g and the telescopic cylinder 13 are all formed into a cylindrical shape using a material capable of blocking X-rays, and as shown in FIG. A sample is supported at point O.

The interval adjustment means 11 sets the interval between each slit by displacing the positions of the photographing cylinders 12 of the screen body 10.
Set the mutual spacing between Sa and Sg.

This interval adjustment means 11 is for each photographing cylinder 12a.
A plurality of rotary links 15a to 15g are provided every 12g and transmit a moving force in the axial direction of the cylinder to the photographing cylinders 12a to 12g by rotation, and the rotation of these rotary links 15a to 15g is operated. The moving amount setting piece 17 connects the parallel link mechanism 16 and the rotation link mechanisms 15a to 15g.

As shown in FIG. 2, the aforementioned rotating links 15a to 15g have one end rotatably supported by a shaft 18, and the other end connected to a photographing cylinder via a connecting fitting 19. .

The axis 18 passes through the sample support position (point O in FIG. 1) and is perpendicular to the central axis of the cylinder.

Further, the connecting fitting 19 is connected to the photographing cylinders 12a to 1.
2g, and a link connecting portion 19b rotatably supported by the pedestal 19a and into which the rotary links 15a to 15g are slidably fitted. , serves to transmit the moving force only in the axial direction of the cylinder.

The parallel link mechanism 16 includes a plurality of parallel movement nodes 16a to 16g provided corresponding to the aforementioned rotation links 15a to 15g, and connections that connect these parallel movement nodes parallel to each other at predetermined intervals. It is composed of nodes 16x, 16y, etc. Connecting nodes 16x, 16y and each parallel displacement node 16a to 16g
are rotatably connected to each other, and the connecting node 16x is rotatably supported around the rotating shaft 18 of the rotating links 15a to 15g. As a result, when the connecting node 16x is rotated, the distance between the parallel moving nodes is adjusted.

The above-mentioned movement amount setting piece 17 is connected to the parallel link mechanism 1
When each parallel movement node 16a to 16g of 6 is displaced, the movement is caused by the corresponding rotation link 15a to 15
Specifically, as shown in FIG.
a movement restriction portion 17b whose movement is restricted by;
It is integrated with a second slider portion 17c that is slidable on the parallel movement nodes 16a to 16g. 1st
The slider portion 17a is obtained by forming a through hole in a small diameter cylindrical portion through which a rotating link is inserted, and the movement regulating portion 17b is obtained by utilizing the outer diameter of the small diameter cylindrical portion. The slider portion 17c is obtained by forming a through hole in a large-diameter cylindrical portion through which the parallel movement node is inserted.

The guide member 20 includes rotating links 15a to 15g.
The movement of the movement amount setting piece 17 is restrained by an arc-shaped cutout 20a having a constant radius around the rotation axis 18 of the movement amount setting piece 17.

In the screen of the above embodiment, the screen main body 10 is composed of a plurality of photographing cylinders 12a to 12g, and each of the photographing cylinders 12a to 12g is provided with slits Sa to Sg. can be imaged at the same time, even if the sample is an unstable crystal such as a protein.
Data about the diffraction lines of a large number of layers can be recorded in a short period of time.

Moreover, the distance adjusting means 11 allows the photographing cylinder 12a to be
~12g By adjusting the mutual spacing, the mutual spacing between the slits Sa to Sg can be matched to the spacing corresponding to the lattice constant of the sample, so it can be used for various samples with different lattice constants. It also has high utility value.

Further, the interval adjusting means 11 is a combination of link mechanisms, and when a rotational movement is given to the connecting nodes 16x of the parallel link mechanism 16, each parallel moving node 1
6a to 16g move in parallel, and thereby the movement amount setting piece 17 moves on an arc of a constant radius centered on the rotation axis 18 of the rotation link. As each movement amount setting piece 17 moves, each rotation link 15a
~15g rotates, and this rotating link 15a~15
The distances between the slits Sa to Sg are adjusted by the movement of the photographing cylinders 12a to 12g in conjunction with the rotation of the slits Sa to Sg. In this way, the means for changing the mutual spacing between the slits Sa to Sg is constructed by a combination of link mechanisms, and does not require expensive drive parts such as high-performance stepping motors, so manufacturing costs can be reduced. It can also be suppressed to

In addition, in the above embodiment, the movement amount setting piece 17
The specific structure of the guide member 20 is not limited to that shown in the drawings, and may be replaced with various known mechanisms that can provide similar functions.

[Effect of the invention] In the screen of the Weissenberg camera according to this invention, the screen body is composed of a plurality of imaging cylinders, and each imaging cylinder is provided with a slit, so that diffraction lines of multiple layers can be detected simultaneously. Even when the sample is an unstable crystal such as a protein, data on the diffraction lines of many layers can be recorded in a short time.

Moreover, by adjusting the distance between the imaging cylinders using the distance adjustment means, the distance between the slits can be matched to the distance corresponding to the lattice constant of the sample. It also has high utility value as it can be used against other people.

Further, the interval adjustment means is a combination of link mechanisms, and when a rotational motion is applied to the connecting nodes of the parallel link mechanism, each parallel moving node moves in parallel, thereby moving the movement amount setting piece to the rotating link. move on an arc of constant radius centered on the axis of rotation. Each rotary link rotates with the movement of each movement amount setting piece, and the distance between the slits is adjusted by the movement of the photography cylinder accompanying the rotation of this rotary link. In this way, the means for changing the spacing between the slits is constructed by a combination of link mechanisms, and does not require expensive drive parts such as high-performance stepping motors, so manufacturing costs can be kept low. You can also do it.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention; Figure 1 is a schematic diagram of the overall configuration, Figure 2 is an enlarged view of the main parts of Figure 1, and Figure 3 is an example of the existing FIG. 1 is a perspective view showing the basic configuration of a Weissenberg camera. DESCRIPTION OF SYMBOLS 1... Film, 2... Crystal sample, 10... Screen body, 11... Spacing adjustment means, 12a~
12g...Cylinder for photography, Sa~Sg...Slit,
15a to 15g... Rotating link, 16... Parallel link mechanism, 16a to 16g... Parallel movement node, 16
x, 16y...Connection node, 17...Movement amount setting piece,
17a...First slider part, 17b...Movement regulating part, 17c...Second slider part, 18...Axis, 1
9... Connecting metal fittings, 20... Guide member.

Claims (1)

[Claims for Utility Model Registration] A screen body comprising a plurality of photographing cylinders arranged in the axial direction of the cylinders each having a slit for allowing only the diffraction rays of the layer to be photographed to reach the film; and an interval adjustment means for setting the interval between the cylinders, the interval adjustment means being provided for each imaging cylinder and transmitting a moving force in the axial direction of the cylinder to the imaging cylinder by rotation. A plurality of rotating links and a plurality of parallel displacement nodes provided corresponding to these rotation links are cylindrical by the rotational movement of connecting nodes that connect these parallel displacement nodes at predetermined intervals. a parallel link mechanism that moves in parallel in the axial direction of the parallel link mechanism; and a plurality of movement amount setting pieces that transmit the movement of each parallel movement node of the parallel link mechanism to a corresponding rotation link, and each of the rotation links: It is supported rotatably about an axis perpendicular to the central axis of the cylinder through the support position of the sample, and each of the movement amount setting pieces includes a first slider part that can freely slide on a rotary link, and a rotary A Weissenberg camera characterized by integrating a movement regulating part whose movement is restricted on an arc of a constant radius centered on the rotation axis of a link and a second slider part which is slidable on a parallel movement node. screen.