JPH0129566Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that visually observes fine dust floating in the air. It relates to a device for directly visualizing existing dust.

In recent years, as environmental pollution has increased, there has been an increase in demand for so-called air purifiers that purify the air by collecting dust in the air. However, since dust suspended in the air is generally invisible, There was no easy way to know the degree of air pollution due to dust and the effectiveness of air purifiers.

Various devices have been developed to measure dust concentration in the air, such as colorimetric, gravimetric, and counting methods, but these devices are heavy and complicated to operate. However, it is not necessarily suitable as a device for easily detecting the amount of dust.

In addition, there is an ultraviolet microscope as a device for observing fine particles that are invisible to the naked eye, but conventional ultramicroscopes do not allow the movement of dust when the wind speed is high, such as at the air intake or air outlet of an air purifier. Due to the high speed, direct visual observation is not possible at all.

An object of the present invention is to eliminate the above-mentioned drawbacks of conventional dust detection devices and to provide a lightweight and portable dust viewing device that can simply, quickly and accurately detect the amount of dust by visual inspection.

Next, the details of the present invention will be explained based on the figures.

FIG. 1 is a diagram showing an embodiment of the present invention, a
is a side cross-sectional view thereof, and b is a cross-sectional view thereof.

In these figures, a light source 1 is provided inside the lens barrel 4,
A condenser lens 2 and a slit 3 are arranged in this order, and a light absorption plate 8 is provided on the optical path of the light beam formed by the lamp 1, condenser lens 2, and slit 3.

A magnifying glass 5 consisting of a lens 13 and a lens 14 is provided at the top of the lens barrel 4, and the optical axis of the magnifying glass 5 intersects with the luminous flux of the lamp 1 between the slit 3 and the light absorption plate 8. There is.

The lens barrel 4 is provided with openings 10, 10 on opposing side walls, and these openings 10 are provided with a stopper 1.
A slide opening/closing lid 7 is provided which slides between 6 and 16 to open and close these openings.

FIG. 2 is a diagram showing another embodiment of the present invention, in which a is a side view and b is a right side view.

In these figures, although not shown inside the lens barrel 4, the light source 1, condenser lens 2,
The slits 3 are arranged in this order, and a light absorption plate 8 similar to that in the embodiment of FIG. 1 is provided in the flow path of the light flux formed by the slits 3.

The optical axis of the magnifying glass 5 intersects the light beam between the slit 3 and the light absorption plate 8, and the intersection angle α is
Adjusted to 40° or more and 60° or less.

Openings 10 , 10 provided on both sides of the lens barrel 4 are provided at positions that form a dust flow path 6 passing through the lens barrel 4 at the condensing point F of the condenser lens 2 .
0 and 10 are provided with slide opening/closing lids 7 that open and close the openings by sliding in close contact with the lens barrel.

Further, a battery case 17 housing a battery 18 for the light source 1 is connected to the bottom surface of the lens barrel 4, and when the opening/closing lid 7 is open, the light source circuit is connected between the switch terminals 20 and 21 provided in the middle. Although it is cut off by being open, when the opening 10 is closed by sliding the opening/closing lid 7, the connecting piece 1 provided at the lower end of the opening/closing lid 7 opens.
9 contacts terminals 20 and 21 to turn on the light source.

FIG. 3 also shows another embodiment of the present invention, in which a is a partially sectional top view, b is a side sectional view, and c is a right sectional view.

In these figures, a light source 1, a condensing lens 2, and a slit 3 are arranged in this order inside a cylindrical lens barrel 4, and the lens barrel 4 is rotatable through a hole provided in the center of a housing 26. is mated to.

The optical axis 11 of the magnifying glass 5, which is integrally attached to the housing 26, is connected to the lamp 1 between the slit 3 and the light absorption plate 8.
The light absorption plate 8 is constituted by two curved conical members and is located on the optical path of the light beam.

Openings 10 and 1 provided in opposing parts of the lens barrel 4
0 is a dust flow path 6 that includes the condensing point of the condensing lens 2
It forms and passes through the lens barrel 4.

The two openings 23, 23 provided in the wall of the hole in the housing 26 into which the lens barrel 4 fits are located at positions that simultaneously open and close the openings 10, 10 as the lens barrel 4 rotates. The inner wall of the hole 26 also serves as the slide opening/closing lid 7.

As the lens barrel 4 rotates, the connecting piece 25, which is fixed to the housing 26 and has one end connected to the battery 18, also rotates.
A switch for the light source 1 is constructed by making intermittent contact with a section 24 provided on the light source 1, but when the inside of the hole closes the openings 10, the connection section 25 comes into contact with the section 24 and closes the light source. 1 is lit.

The condensing lens 2 in the present invention may be a separately provided lens as shown in FIGS. 1 to 3, but it may also be a lens included in a light source such as a lens bulb, or it may be a lens included in a light source such as a lens bulb. may be used together.

The slit 3 is used to make the field of view of the magnifying glass 5 a dark field, and as shown in the figure, a plurality of slits may be used, or one or any of them may be used.The present invention is limited to the shape and number of slits. Not done.

The magnifying glass 5 may have a fixed focus, but may also have a variable focus and variable magnification as shown in FIG.

Optical axis 11 of magnifying glass 5 and optical axis 12 of condensing lens 2
When the angle α between the In order to prevent light from being reflected from the edges of the slit, the field of view of the magnifying glass must be made smaller than necessary.

Furthermore, when α is larger than 60°, the reflected light from visible dust decreases, making it difficult to see.

According to the experimental results of the inventors, when the object is dust in the air, the dust can be seen most clearly in a wide field of view when α is in the range of 40° to 60°.

Slide opening/closing lid 7 for opening and closing the dust flow path 6
may be a dedicated lid as shown in Figure 1, but a second
As shown in the figure, it may be used in combination with a function such as a switch.

Further, the slide opening/closing lid 7 may be a sliding opening/closing lid that slides linearly as in the embodiments shown in FIGS. 1 and 2, but it may also slide along the circumference as shown in FIG. 3. .

The surface of the light-absorbing plate 8 may be finished with a known faded black finish, but a surface coated with a black porous material such as granular activated carbon is particularly effective in increasing night vision.

Further, as long as the light absorption plate 8 can sufficiently absorb the luminous flux of the lamp 1, there is no limit to the angle θ formed with the luminous flux, but it is preferable that θ is smaller than 45°.
When θ is greater than 45°, a slight amount of light reflected from the surface of the light absorbing plate 8 may reduce the night vision of the field of view of the magnifying glass.

Next, the effects of the present invention will be described.

To use the visual instrument of the present invention, when the air to be tested is still, open the slide opening/closing lid 7 and scoop the air to be tested into the lens barrel through the opening 10. When the air is flowing, such as at the air intake or outlet of the machine, simply open the opening 10 to introduce the test air into the lens barrel, close the slide opening/closing lid 7, and turn on the light source 1 at the same time. The dust in the flow path is visually observed through the magnifying glass 5.

The light from the light source 1 is condensed by a condenser lens 2 to form a strong light beam, but stray light is cut by a slit 3, and a light absorption plate 8 provided on the optical path of the light beam is used.
The reflected light is cut by the slit 3.
The field of view of the magnifying glass 5, which has an optical axis that intersects with the light flux between the light absorbing plate 8 and the light absorption plate 8, becomes a completely dark field. Therefore, the dust in the air to be tested introduced into the lens barrel 4 receives only the light from the luminous flux and appears as a bright spot in the dark field of the magnifying glass 5, but the air inside the lens barrel 4 Since the flow is blocked by the sliding lid 7, the movement of the dust is slow, and therefore the dust can be seen very clearly.

The dust viewing device of the present invention has an extremely simple structure and is lightweight, making it easy to handle and portable.Also, unlike conventional ultraviolet microscopes, it is extremely easy to visually see dust in airflows with high wind speeds. I can do it.

Furthermore, since the opening/closing lid 7 in the present invention is a sliding opening/closing lid that slides along the opening 10, it does not stir up the flow of air inside and outside the lens barrel 4 when opening/closing. Since there is no disturbance, the dust detection according to the present invention is accurate.

Thus, the present invention eliminates the above-mentioned drawbacks of conventional dust detection devices and provides a lightweight and portable dust viewing device that can simply, quickly and accurately detect the amount of dust by visual inspection.

[Brief explanation of the drawing]

1 and 2 each show an embodiment of the present invention, and FIG. 3 further shows another embodiment of the present invention. 1... Light source, 2... Condensing lens, 3... Slit, 4... Lens barrel, 5... Magnifying glass, 6... Dust channel, 7... Opening/closing lid, 8... Light absorption plate, 9 ...Switch, 10...Aperture, 11...Optical axis, 12...
Optical axis, 13...eyepiece, 14...objective lens, 15...lens barrel, 16...stopper, 17...
...Battery case, 18...Battery, 19...Connection piece,
20...Switch terminal, 21...Terminal, 22...
Conductor, 23... Opening, 24... Section, 25...
Connection piece, 26...casing, 27...hole.

Claims (1)

[Scope of utility model registration request] Light source 1, lens 2, slit 3 inside housing 4
are arranged in this order, a light absorption plate 8 is provided on the optical path of the light beam formed by these, and the optical axis of the magnifying glass 5 provided on the side surface of the housing 4 is aligned between the slit 3 and the light absorption plate 8. A dust viewing device characterized in that a slide opening/closing lid 7 is slidably provided on an air intake port 10 provided in a housing 4 so as to intersect with the luminous flux in between.