JPH0129565Y2 - - 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. It's so fast that it can't be seen visually.

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 easily 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 lens 13 and a lens 1 are arranged in the upper part of the lens barrel 4.
4, the optical axis 11 of the magnifying glass 5 intersects with the optical axis 12 of the condensing lens 2 at the condensing point F, and the optical axis 11 is connected to the optical axis 1.
The angle α formed with 2 is in the range of 40° to 60°.

The lens barrel 4 is provided with openings 10, 10 on opposing side walls, and a dust flow path 6 is formed that passes through the lens barrel at the focal point F of the condenser lens 2.

Also, the openings 10, 10 have stoppers 16, 1.
A slide opening/closing lid 7 is provided which slides between the openings 6 to open and close these openings.

Further, inside the lens barrel 4, a light absorption plate 8 is provided facing the light source 1 at a position where the distance l from the condenser lens 2 is larger than the distance f to the condensing point. The angle θ between the condenser lens 2 and the optical axis 12 is
It is smaller than 45°.

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 the magnifying glass 5 is attached to the top surface of the lens barrel 4 so that its optical axis 11 intersects with the optical axis 12 of the condensing lens 2 at the condensing point F of the condensing lens 2. A light absorption plate 8 similar to that in the embodiment of FIG. 1 is provided on the optical path of the light beam.

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 the light source circuit is connected between switch terminals 20 and 21 provided in the middle when the opening/closing lid 7 is open. 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 the figure, 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 the housing 26. is mated to.

The optical axis 11 of the magnifying glass 5 integrally attached to the barrel 26 comes to intersect with the optical axis 12 of the condensing lens 2 at the condensing point F of the condensing lens 2 through the hole 27 provided in the lens barrel 4. A curved light absorption plate 8 is provided on the optical path of the light beam formed by the lamp 1, the condensing lens 2, and the slit 3.

Openings 10 and 1 provided in opposing parts of the lens barrel 4
0 forms a dust flow path 6 that includes the focus of the condenser lens 2 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 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.

Inside the lens barrel 4, there is a distance l from the condenser lens 2.
A curved conical light absorbing plate 8 having an angle θ of less than 45° with the optical axis 12 of the condensing lens 2 is provided at a position where is larger than the distance f to the condensing point. This prevents light from diffusing into the lens barrel.

FIG. 4 is a cross-sectional view of yet another embodiment of the present invention.

In the figure, a light source 1, a condensing lens 2, and a slit 3 are arranged in this order inside a lens barrel 4, and a magnifying glass 5 has its optical axis converging at the condensing point F of the condensing lens 2. It is attached to the lens barrel 4 so that it intersects with the optical axis 12 of the lens 2 and the angle α thereof is 40° to 60°.

Openings 10 provided at two opposing locations on the lens barrel 4,
The dust flow path 6 formed by the condenser lens 2
The light passes through the lens barrel 4, including the focal point F of the light.

A bellows-type pump 31 provided on one side of the lens barrel 4 sucks dust-containing air from an intake port 28 provided at the tip of the lens barrel, passes through an opening 10 and a dust flow path 6, and discharges it to the outside from an exhaust port 32. It's getting old.

The valves 7, 7 of the pump 31 are made of an elastic material such as a rubber plate, and the pressure plate 2 of the pump 31 is made of a resilient material such as a rubber plate.
It opens only when 9 is pressed, and closes when not pressed, and also serves as an opening/closing lid for the dust flow path 6.

The condensing lens 2 in the present invention may be a separately provided lens as shown in FIGS. 1 to 4, but it may also 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 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/closing the dust flow path 6
may be a dedicated lid as shown in Figure 1, but a second
As shown in FIG. 4, it may be used in combination with other functions such as a movable piece of a switch or a valve, and the present invention is not limited to the shape of the opening/closing lid or the operating method.

Although the present invention is not limited to the means for sending dust-containing air into the dust flow path 6, it is convenient to use a simple pump as shown in Fig. 4 to quickly observe dust in the airflow due to the slow flow rate. It is.

The power source for lighting the light source 1 may be a battery built into the viewing device as shown in FIGS. 2 and 4, but it may also be a separate power source.

In the present invention, a light absorption plate 8 is provided facing the light source 1 at a position where the distance l from the condenser lens 2 is larger than the distance f to the condensing point and on the reflection side of the light source 1,
If the angle θ between the light absorbing plate and the optical axis 12 of the condensing lens 2 is made smaller than 45°, the night vision of the field of view of the magnifying glass 5 will be significantly increased, making it easier to see dust.

When θ is larger than 45°, it is not preferable because a small amount of reflected light on the surface of the light absorbing plate 8 reduces the night vision of the field of view of the magnifying glass.

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.

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

To use the viewing device of the present invention, open the opening/closing lid 7 and shake it strongly from side to side in the air, or open the opening 10.
For example, after introducing dust-containing air into the dust flow path 6 by bringing it close to the air intake or air outlet of an air purifier, close the opening/closing lid 7, and at the same time turn on the light source 1 and let the air flow through the magnifying glass 5. Visually check the dust on the road.

The light from the light source 1 is condensed by the condensing lens 2 to the condensing point F, so that at the condensing point F, the dust in the flow path 6 that passes through the lens barrel 4 is irradiated with strong light. 3 and the light absorbing plate 8, so when you look through the magnifying glass 5, you can see the dust floating in the better dark field as described above, but in the present invention, the dark field is blocked by the lens barrel 4. Since the flow of air in the dust flow path 6 is blocked, 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.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIGS. 2, 3, and 4 are views showing other embodiments of the present invention, respectively. 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... Housing, 27... Hole, 28... Intake port, 29... Pressure plate, 30... Bellows, 31...
...Pump, 32...Exhaust port.

Claims (1)

[Claims for Utility Model Registration] (1) A light source 1, a lens 2, and a slit 3 are arranged in this order inside the lens barrel 4, and a light absorption plate 8 is placed on the optical path of the light beam formed by these. Provided, lens barrel 4
A dust visualizing device characterized in that the optical axis of a magnifying glass 5 provided on the side surface of the slit 3 intersects with the light beam between the slit 3 and the light absorption plate 8. (2) The dust visual device according to claim 1, which is a utility model registration, characterized in that an intersection angle α between the optical axis of the magnifying glass 5 and the intersection beam is 40° or more. (3) The dust visual device according to claim 1, wherein the light absorbing plate 8 is provided obliquely at an angle of 45 degrees or less with respect to the light beam.