JPH089629Y2 - Shading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a light shielding device, and more particularly, a device for shielding a central portion of a light beam.

[Prior Art] With the rapid development of photodetection technology and spectroscopic technology in recent years, analytical instruments utilizing light have been developed in various fields.

FIG. 3 shows the configuration of an automatic cell separation / analysis device as an example of the analysis device using such light.

In the apparatus shown in the figure, water, a sheath, and a sample are delivered from a delivery device 10, and a laminar sheath flow and a sample flow are made to flow out from a jet nozzle 12 at the center thereof.

When this flow is irradiated with the laser light emitted from the laser light generator 14, the cells pass the irradiation position of the laser light accurately and at high speed.

By measuring the scattered light and fluorescence emitted by the cells at this time,
The characteristics of individual cells are rapidly analyzed.

On the other hand, the nozzle assembly is vibrated by ultrasonic waves,
The jet flow is made into droplets. When the target cell is contained in this droplet, a positive or negative electric charge is given to the droplet. A voltage is applied to the electrodes 16a and 16b to form an electric field. The above-mentioned charged droplets are deflected when passing through an electric field, and by separating / collecting them, it is possible to separate a specific target cell population.

By the way, the scattered light or fluorescence due to the irradiation of the laser light described above is spectrally analyzed by the optical systems 18, 20, 22, 24, and 26. The result is sent to the computer 28, and the desired data processing is performed.

However, not all the light measured by the optical system is a target, and for example, forward scattered light or side scattered light may be a target for measurement. In such a case, it is necessary to exclude the central portion of the light beam and extract only the light at the peripheral portion of the beam.

Conventionally, in order to extract only such a beam peripheral portion, a light shielding device as shown in FIG. 4 has been used.

The light-shielding device shown in the figure comprises a housing 32 and a light-shielding plate 34 arranged substantially in the center of the opening 32a of the housing 32.

Then, the light beam 36 incident from the opening 32a is shielded by the light shielding plate 3
The central part is shielded by 4 and the light at the top and bottom (periphery) in the figure passes as it is.

[Problems to be Solved by the Invention] By the way, it is necessary to change the light-shielding range of the light-shielding device depending on the measurement target or the like.

However, the conventional light-shielding device has a problem that the light-shielding plate 34 must be replaced in order to adjust the light-shielding range, and the work is complicated.

In particular, since the light blocking plate 34 must be positioned at the center of the light beam 36, it is necessary to make extremely delicate adjustments when replacing the light blocking plate 34, and it is possible to more easily adjust the light blocking range. There was a strong demand for development of the device.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a light-shielding device that is simple in machine and can surely adjust the light-shielding range in the central portion of the beam.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a light-shielding device according to the present invention is parallel to a base portion having a fixing portion for fixing and mounting the light-shielding device to an external device. Light-shielding blades formed of a plurality of plate-shaped members that are arranged in parallel at positions and that face the light beam, a plurality of holding portions that hold the light-shielding blades, and a knob at one end, and the other end And a blade adjusting section composed of a plurality of adjusting screws screwed with the holding section,
including.

The light shielding device rotates the knob of the blade adjusting unit to change the relative screwing position of the adjusting screw and the holding unit, and moves the light shielding blade in the parallel direction to shield the central portion of the light beam. In addition, the light-shielding range is adjusted.

[Operation] Since the light shielding device according to the present invention has the above-mentioned means, the center of the light beam is shielded by the plurality of light shielding blades, and the light beam in the peripheral portion can be passed through as it is.

Further, by moving the plurality of light-shielding blades relative to each other by the blade adjusting unit and adjusting the area of the overlapping portion of the light-shielding blades, it is possible to change the light-shielding range of the light beam by a simple operation and obtain only a desired light beam. It is possible. Further, by simultaneously moving the plurality of light shielding blades within the movable range of the light shielding blades, the light shielding position can be freely determined. Therefore, it is possible to adjust the absolute position of the light-shielding blade simply by rotating the knob provided in the blade adjusting unit without changing the position of the entire light-shielding device according to the position of the light beam itself.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of a shading device according to an embodiment of the present invention.

The light-shielding device 100 shown in the figure has two light-shielding blades 102 and 104 arranged in parallel, blade adjusting portions 106 and 108 capable of adjusting the vertical position of the light-shielding blades 102 and 104, and a fixing for fixing the device 100 to an external device. And portions 110a and 110b.

The blade adjusting portions 106 and 108 include holding portions 112 and 114 that hold the blades 102 and 104 by screwing, and adjusting screws 116 and 118 that are screwed into the holding portions 112 and 114. The holding parts 112 and 114 are supported by the base part 120 so as to be vertically movable and non-rotatable. Further, the adjusting screws 116 and 118 are supported by the base 120 so as to be rotatable and immovable in the vertical direction.

Therefore, the screws 116 and 118 provided on the blade adjusting units 106 and 108 are
By rotating the knobs 116a and 118a of the
The relative vertical positions of 2,114 and the base 120 are changed, and accordingly, the light blocking blades 102, 104 can be moved vertically.

Then, by changing the vertical positions of the light-shielding blades 102 and 104, the area of the overlapping portion of the blade tip portions 102a and 104a is adjusted, and the light-shielding range of the light beam 122 can be changed.

The light beam and the light-shielding range when the device of this embodiment is used will be described below with reference to FIG.

FIG. 3A shows an example in which the light shielding blades 102 and 104 are vertically aligned.

In this case, the blade tip portions 102a and 104a of the light shielding blades 102 and 104 are completely overlapped with each other, and the range where the light beam 122 is shielded is the width W ₁ of one blade tip portion 102a (or 104a).

Therefore, the light beam 122 is shielded only by the width W _{1 of the} blade tip portions 102a and 104a, and the light rays at the peripheral portion thereof pass through as it is.

Next, in the same figure (B), rotate the knob 116a to adjust
The state in which the blade tip portion 102a has been raised by about 106 by the shading blades by 106 is shown.

As is clear from the figure, in this case, the range of light shielding is the width W ₂ of about 1.5 blade tip portions 102a (or 104a).
Becomes

Therefore, the light beam 122 is transmitted by the blade tip 102a (or 1
04a) is shielded within the width W ₂ of about 1.5 sheets, and the light rays in the upper and lower parts of the width W ₂ pass through as it is.

Further, the knob 116a is further rotated so that the blade tip 102a
An example in which the lower end of the blade and the upper end of the blade tip portion 104a are aligned is shown in FIG.

In this state, the blade tips 102a and 104a do not overlap at all, and the obtained light-shielding range is the blade tips 102a and 104a.
The total width, i.e. the width W ₃ of the two sheets, the light beam 122
Is shielded within the width W ₃ of the two shielding blades, and a wider shielding range can be obtained.

As described above, according to the apparatus of this embodiment, the vertical positions of the light-shielding blades 102 and 104 are moved by the blade adjusting units 106 and 108 so as to fall within the range of minimum, one blade tip portion, maximum, and two blade tip portions. Thus, a desired light shielding area can be obtained.

In the embodiment described above, the light blocking range is determined by moving the vertical position of the light blocking blade 102.
Of course, it is also possible to move the other light shielding blade 104 up and down.

Further, by moving the upper and lower positions of both the light shielding blades 102 and 104, it is possible to finely adjust the light shielding range.

Further, the light-shielding blades 102 and 104 can freely determine the vertical position within the vertically movable range. Therefore, according to the position of the light beam 122 itself, the absolute positions of the light shielding blades 102, 104 in the vertical direction can be adjusted by merely rotating the knobs 116a, 118a without changing the position of the entire light shielding device 100.

Although the number of light-shielding blades is two in this embodiment, three or more may be provided if it is desired to cover a wider light-shielding range.

[Advantages of the Invention] As described above, according to the light shielding device of the present invention, light is shielded by a plurality of light shielding blades. Therefore, the relative position of the light shielding blades is adjusted to change the area of the overlapping portions. This makes it possible to adjust the light-shielding range easily and to make the structure extremely simple. Furthermore, by simultaneously moving the plurality of light-shielding blades within the movable range, it is possible to adjust the absolute position of the light-shielding blades according to the position of the light beam itself, and surely shield the central portion of the light beam. be able to.

[Brief description of drawings]

1 is a schematic perspective view of a shading device according to an embodiment of the present invention, FIGS. 2 (A) to 2 (C) are explanatory views showing the operation of the shading device shown in FIG. 1, and FIG. FIG. 4 is a general explanatory view of an analyzer using a light shielding device, and FIG. 4 is an explanatory view of a conventional light shielding device. 100 ...... Shading device, 102, 104 ...... Shading blade, 106, 108 ......
Adjustment unit.

Claims (1)

[Scope of utility model registration request] 1. A base part having a fixing part for fixing and mounting a light-shielding device to an external device, and a plurality of plates arranged in parallel with each other and facing each other with a light beam. A light-shielding blade made of a strip-shaped member, a plurality of holding portions for holding the light-shielding blades, a blade adjusting portion having a plurality of adjusting screws having a knob at one end and the holding portion screwed to the other end, In the light-shielding device configured by, the relative screwing position of the adjusting screw and the holding unit is changed by rotating the knob of the blade adjusting unit, and the light-shielding blade is moved in the relative parallel direction, so that the central portion of the light beam is moved. A light-shielding device that shields light and adjusts a light-shielding range.