JPH0731159Y2 - 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. 4 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.

At this time, by measuring scattered light and fluorescence emitted by the cells, various characteristics of each cell can be rapidly analyzed.

Meanwhile, the nozzle assembly is vibrated by ultrasonic waves to make the jet flow 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. 5 has been used.

The shading device shown in the figure includes a housing 32 and the housing.
The light shielding plate 34 is arranged substantially at the center of the 32 openings 32a.

Then, the light beam 36 incident from the opening 32a is shielded by the light shielding plate 34.
As a result, the central portion is shielded, and the light at the top and bottom (periphery) in the figure passes through 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 object to be measured.

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, when replacing the light blocking plate 34, there is no choice but to make extremely delicate adjustments, and the light blocking range can be adjusted more easily. 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 having a simple mechanism and capable of surely adjusting 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 includes a light-shielding portion, a support portion, and an angle adjusting portion.

The light-shielding portion is formed of a plate-like member that is bent into a substantially L-shape, and one surface thereof forms a parallel surface that is arranged substantially parallel to the light beam, and the other surface forms a facing surface that substantially faces the light beam. However, an opening is formed in the facing surface.

Further, the supporting portion supports the facing surface of the light shielding portion.

The angle adjusting section is capable of adjusting the angle of the parallel surface of the light shielding section with respect to the facing surface.

The center of the light beam is located between the opening of the facing surface and the parallel surface.

[Operation] Since the light shielding device according to the present invention has the above-mentioned means, the center of the light beam is located between the opening formed in the facing surface and the parallel surface. Therefore, the central part of the light beam is shielded by the space between the parallel surface and the opening, the light beam positioned in the opening passes through the opening, and the light beam positioned outside the parallel surface is also transmitted.

As described above, according to the light shielding device of the present invention, it is possible to shield only the central portion of the light beam and allow the peripheral light beam to pass through.

And if you want to change the light beam blocking range,
This can be easily performed by adjusting the angle of the parallel surface of the light shielding part by the angle adjusting part.

As described above, according to the light-shielding device of the present invention, the light-shielding portion is formed by the plate-shaped member bent in an L-shape, and therefore the light-shielding plate is replaced every time the light-shielding range is changed as in the conventional case. There is no need to do it, and the work is easy.

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

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

A light shielding device 100 shown in the figure includes a housing 102, a light shielding portion 104 arranged in the housing 102, and a support portion 106 that supports the light shielding portion.

An opening 102a is formed on the entire surface of the housing 102, and an opening 106a is also formed on the front surface of the supporting portion 106.

The light shielding portion 104 is a facing surface facing the light beam 136.
And a parallel surface 110 substantially parallel to the light beam 136. An opening 104a is formed in the facing surface 108, and the lower portion of the facing surface 108 is fixed to the front surface of the supporting portion 106 by screws 112a and 112b.

The parallel surface 110 is inserted into the opening 106a of the supporting portion 106.

Further, a knob 114 for vertically moving the supporting portion 106 and knobs 116a, 116b as angle adjusting portions for vertically swinging the parallel surface 110 are arranged on the upper surface of the housing 102.

The above construction is shown in more detail in FIG.

FIG. 1A is a front view of the light shielding device 100, and FIG. 1B is a side sectional view.

As is clear from the figure, the supporting portion 106 is arranged in the housing 102 so as to be vertically slidable. Then, the supporting unit 106
A female screw portion 118 is formed on the upper part of the, and the male screw portion of the knob 114 is screwed into the female screw portion 118. The knob 114 is restricted in vertical movement with respect to the housing 102. As a result, when the knob 114 is rotated, the screwing position of the male screw portion 114a at the tip of the knob 114 and the screw portion 118 is changed, and the supporting portion 106 is moved to the housing 102. Can be moved up and down.

On the other hand, the male screw portion 116a provided on the knob 116 is the support portion 106a.
It is screwed into a female screw portion 120 formed on the upper part of the support, and when the knob 116 is rotated, the knob 116 is rotated by the support portion 10.
Moves up and down with respect to 6.

Further, since the front end 122 of the knob 116 is fixed to both sides of the rear end of the parallel surface 110 of the light shielding portion 104, the parallel surface 11 of the light shielding portion 104 with respect to the facing surface 108 is rotated by rotating the knob 116.
The angle of 0 can be adjusted.

Next, the operation of the light shielding device according to this embodiment will be described with reference to FIG.

First, FIG. 3A shows a state in which the parallel surface 110 of the light shielding portion 104 is completely parallel to the light beam 136.
In this state, the light beam 136 is blocked only between the upper end of the opening 104a of the light blocking unit 104 and the upper surface of the parallel surface 110 (interval L ₁ ), and the peripheral portions of the light beams located above and below the light beam 136 remain as they are.
Pass 100.

On the other hand, as shown in FIG. 3B, when the knob 116 is rotated and the rear end of the parallel surface 110 of the light shielding unit 104 is pulled upward,
Accordingly, the light beam 136 is shielded at a distance L ₂ from the upper end of the opening 104a formed in the facing surface 108 to the rear end of the parallel surface 110.

Therefore, it is understood that the light beam 136 is shielded in a wider range as compared with FIG. 3 (A).

At this time, if the vertical position of the light shielding unit 104 is not changed at all, the transmitted light 136a in the lower region of the light beam 136 does not change and only the transmitted light 136b in the upper region decreases.

Therefore, as shown in FIG. 3 (C), the knob 114 is rotated to lower the vertical position of the supporting portion 106 itself with respect to the housing 102.
The range of 136b can be optimized. In addition, knob 11
Since the vertical movement of 6 is only restricted with respect to the supporting portion 106, the relative angle between the parallel surface 110 of the light transmitting portion 104 and the facing surface 108 does not change, and the light shielding distance L ₂ does not change.

As described above, according to the light shielding device of this embodiment, the light shielding unit
Since 104 is composed of a leaf spring bent into an L-shape, the structure is extremely simple, and the light shielding range can be arbitrarily adjusted by adjusting the knob 116.

Further, since the vertical position of the light shielding portion 104 can be adjusted together with the support portion 106 by the knob 114, the light shielding state can always be obtained at the optimum position.

In the present embodiment, the example in which the knob 114 is shorter than the knob 116 has been described, but it is also preferable to make the knob 114 longer than the knob 116 to improve usability depending on the frequency of use.

Further, in this embodiment, the support portion 106 is slid with respect to the housing 102, but in order to facilitate the sliding and to eliminate the deflection of the support portion 106, a dovetail groove is formed in the housing 102 to support the dovetail groove. The parts 106 may be configured to fit together. Further, a groove is formed adjacent to the surface of the dovetail groove facing the supporting portion 106, and the surface of the housing 102 facing the supporting portion is supported by the supporting portion 1.
It is also preferable that it can be pressed against 06.

[Advantages of the Invention] As described above, according to the light shielding device of the present invention, the light shielding is performed by the light shielding portion that is bent and formed in an L-shape. The light-shielding range can be easily adjusted by changing the relative angle of and the structure can be extremely simplified.

[Brief description of drawings]

FIG. 1 is an external perspective view of a shading device according to an embodiment of the present invention, FIG. 2 is an explanatory view of a detailed structure of the shading device shown in FIG. 1, and FIG. 3 is a shading device shown in FIG. FIG. 4 is a schematic view showing the operation of the device, FIG. 4 is a general explanatory view of an analyzer using a light shielding device, and FIG. 5 is an explanatory view of a conventional light shielding device. 100 ... Shading device, 104 ... Shading part, 106 ... Supporting part, 108 ... Opposing surface, 110 ... Parallel surface, 116 ... Knob (angle adjusting part).

Claims (1)

[Scope of utility model registration request] 1. A plate-shaped member bent in a substantially L shape, one surface of which is a parallel surface arranged substantially parallel to a light beam, and the other surface of which is a facing surface which substantially faces the light beam. Then
A light-shielding portion having an opening formed in the facing surface, a support portion supporting the facing surface of the light-shielding portion, and an angle adjusting portion capable of adjusting an angle of a parallel surface of the light-shielding portion with respect to the facing surface. A light-shielding device, wherein the center of the light beam is located between the opening of the facing surface and the parallel surface.