JP6940844B2 - Dust recognition device - Google Patents

Description

The present invention relates to a dust recognizing device for visualizing dust.

As a device for photographing dust, a technique has been proposed in which a light source for photographing and a camera are arranged inside the device, air is taken into the device, and the dust in the air is measured by the camera (see Patent Document 1).

JP-A-2009-53065

An object of the present invention is to provide a dust recognition device capable of reliably photographing dust.

The dust recognition device of the present invention
With the housing
An LED light source provided in the housing so as to emit light,
A camera provided with a lens for photographing the inside of the housing, and
A light-shielding portion provided between the LED light source and the lens,
The inner surface of the housing includes a reflection suppressing portion that suppresses reflection provided in a region where the light of the LED light source directly or indirectly hits.
The lens surface of the lens is within the extension region of the luminous flux emitted from the LED light source.
The light-shielding portion is provided so that the light from the LED light source does not directly hit the lens surface.

According to the present invention, a shielding portion is provided to prevent the light from the LED light source from entering the lens of the camera. It prevents the light from the LED light source from entering the camera directly. For this reason, when the light from the LED light source directly enters the lens, the phenomenon that the entire or part of the image is reflected in white does not occur on the shooting screen, so that it is possible to reliably shoot the dust illuminated by the light. It is possible to visualize the dust contained in the air.

The lens surface of the camera is provided in the luminous flux emitted from the LED light source. As a result, it is possible to reliably photograph the dust in the luminous flux illuminated by the light of the LED light source. Further, since the reflection suppressing portion is provided on the inner surface of the housing in the region where the light of the LED light source hits, it is possible to prevent the reflected light from entering the lens of the camera.

In the present invention, the angle formed by the direction of the light path and the direction of the camera can be 45 degrees to 90 degrees. As a result, it is possible to reliably shoot the dust illuminated by the light so that the light does not enter the camera.

In the present invention, a light guide unit that guides the light emitted from the LED light source can be included. According to this, the light emitted from the LED light source passes through the light guide portion, the emission of the light is suppressed, and the light is radiated into the housing as more parallel light. Therefore, it is possible to prevent the light from the LED light source from entering the camera hidden by the light-shielding portion in relation to the LED light source.

In the present invention, the focal point of the camera can be set at a position of 1 to 10 mm on the luminous flux side of the lens surface. By setting the focus at such a position, a portable dust recognition device can be realized.

In the present invention
The region directly or indirectly exposed to the light of the LED light source is a part or all of the inner surface of the housing facing the LED light source, and a part or a part of the inner surface of the housing facing the camera. It can be at least one of all areas.

It is a figure which shows typically the dust recognition apparatus which concerns on embodiment. It is a figure for demonstrating the angle formed by the traveling direction of light of an LED light source, and the direction of direction of a camera. It is a figure which shows typically the modification of the dust recognition apparatus which concerns on embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail.

1. 1. Dust recognition device The dust recognition device 100 according to the embodiment includes a housing 10, an LED light source 20, and a camera 30.

The housing 10 is provided with an intake port 12 for taking in air and an exhaust port 14 for discharging air. An exhaust fan 16 is provided at the exhaust port 14. The housing 10 can be made of a structure and a material that prevents external light from entering the inside of the housing 10. The structure of the housing 10 is preferably a structure and a material such that the reflection of light is suppressed on the inner surface. The inner surface of the housing 10 can be, for example, coated with a matte black coating.

The LED light source 20 is provided so as to be able to emit light in the housing 10. The LED light source 20 may be provided, for example, outside the housing 10 or inside the housing 10. When the LED light source 20 is provided on the outside of the housing 10, a through hole is provided in the housing 10, and light can be emitted to the inside of the housing 10 through the through hole. By providing the LED light source 20 on the outside, it is possible to prevent the heat generated from the LED light source 20 from being accumulated in the housing 10. The LED light source 20 can be realized by, for example, an LED that emits visible light. The LED light source 20 may be provided with an optical component (for example, a lens) having a function of converging light at the exit portion. The concept of converging light also includes making diffused light parallel. A light guide unit 24 that suppresses light divergence and guides light can be provided at the tip of the LED light source 20. If necessary, the LED light source 20 may be provided with a heat radiating unit 22 for radiating heat generated from the LED light source 20.

The camera 30 is for photographing the inside of the housing 10, and is provided with a lens 32. The lens surface of the lens 32 is within an extension region of the light flux emitted from the LED light source 20. As a result, it is possible to reliably photograph the dust in the luminous flux illuminated by the light of the LED light source 20. The camera can be realized by, for example, a CCD camera or a CMOS camera. The entire camera 30 may be provided in the housing 10, or as shown in FIG. 3, the lens 32 of the camera 30 is inserted in the housing 10, and the main body portion of the camera 30 goes out of the housing 10. It may be the mode that is. When the camera 30 is installed as shown in FIG. 3, a through hole may be provided in the housing 10 and the lens 32 may be inserted into the through hole. The camera 30 and the lens 32 may be integrated or separate. When the camera 30 is configured as shown in FIG. 3, various existing cameras can be applied, and the applicable range can be increased.

The angle θ formed by the direction of the light path of the LED light source 20 and the direction of the camera 30 (shooting direction) can be 45 to 90 degrees. As a result, it is possible to reliably shoot the dust illuminated by the light so that the light does not enter the camera 30.

The focus of the camera 30 can be set at a position of 1 to 10 mm on the luminous flux side of the lens surface. According to this focal length, dust can be preferably photographed.

The light-shielding portion 34 is provided between the LED light source 20 and the camera 30. The light-shielding portion 34 is for suppressing light from entering the lens 32 of the camera 30. The light-shielding portion 34 can be formed of a light-shielding plate. For example, a cloth or film (matte black felt, matte black non-woven fabric, etc.) that suppresses reflection may be provided on the side surface of the light-shielding portion 34 on the LED light source 20 side. The cloth or film that suppresses reflection can be attached to the light-shielding portion 34 with an adhesive, glue, or the like.

A reflection suppression unit 18 that suppresses the reflection of light from the LED light source 20 can be provided on the inner surface of the housing 10. Specifically, the reflection suppression unit 18 is provided in a region where the light of the LED light source 20 directly or indirectly hits. The region directly hit by the light of the LED light source 20 is at least a part of the inner surface of the housing 10 facing the LED light source 20 and is the region where the light of the LED light source 20 travels straight and hits first. The region indirectly hit by the light of the LED light source 20 is at least a part of the inner surface of the housing 10 facing the camera 30, and is a region of the light of the LED light source 20 that is hit by the light reflected by the inner surface of the housing 10. .. As a result, it is possible to prevent the light emitted from the LED light source 20 and reflected by the inner surface of the housing 10 from entering the lens surface of the camera 30. The reflection suppressing unit 18 is not particularly limited as long as it can suppress the reflection of light, but is, for example, from a cloth or film that suppresses reflection (matte black felt, matte black non-woven fabric, etc.). It may be configured. The cloth or film that suppresses reflection may be attached to the inner surface of the housing 10 with an adhesive or glue. The reflection suppression unit 18a provided on the surface facing the housing 10 facing the LED light source 20 and the reflection suppression unit 18b provided on the surface facing the camera 30 may be separated or continuous. And may be one.

The image captured by the camera 30 can be displayed by a known display means 40 such as a monitor. The power source 50 for driving the LED light source 20, the camera 30, the fan, and the like is not particularly limited, but can be realized by, for example, a rechargeable battery such as a lithium ion secondary battery. When the power source 50 is driven by a lithium ion battery, a charging external power source 55 can be provided to charge the lithium ion battery.

Shooting data can be stored in an external storage medium such as a flash memory or a hard disk. The first to third switches SW1 to SW3 can be provided. The first switch SW1 is a fan operation switch, the second switch SW2 is an LED light source operation switch, and the third switch SW3 is a start switch / function changeover switch of the display means 40. The camera 30 can be connected to the video capture 60, if desired. For video capture, interchangeable storage media 65 such as SD memory is used for video capture 60.

Dust reflected on the screen can be quantified by using an arithmetic processing unit (not shown) based on the image captured by the camera 30. This digitization can be displayed as a numerical value of the luminance signal (Y) level of the NTSC image signal. The arithmetic processing device can be realized by a CPU, a ROM, and a RAM.

2. Operation The display means 40 is switched to the display mode (View) by the third switch SW3, the fan 16 is driven by the first switch SW1, and air is introduced into the housing 10. The LED light source 20 is activated by the second switch SW2 to emit light, and the illuminated dust is photographed by the camera 30. The image taken by the camera 30 can be displayed on the display means 40, and the dust can be visually and grasped.

3. 3. Action and effect According to the present embodiment, the following action and effect can be achieved.

(1) A shielding portion 34 is provided to prevent the light from the LED light source 20 from entering the lens 32 of the camera 30. The light from the LED light source 20 is prevented from directly entering the camera 30. Therefore, when the light of the LED light source 20 directly enters the lens 32, the phenomenon that the whole or a part of the LED light source 20 appears white on the shooting screen does not occur, so that the dust illuminated by the light is reliably photographed. be able to.

For example, according to the technique described in Patent Document 1 of the background technique (hereinafter referred to as "conventional technique"), the light of the light source may be diffracted and directly reflected on the camera 30, and the light reflects the light by dust. The light is turned off and the dust cannot be grasped.

However, in the present embodiment, the light emitted by the LED light source 20 is passed through the light guide unit 24, the emission of the light is suppressed, and the light is radiated into the housing as parallel light. Therefore, it is possible to suppress the light from the LED light source 20 from entering the camera 30 hidden by the light-shielding portion in relation to the LED light source 20, so that the problem that occurs in the prior art does not occur.

(2) The lens surface of the camera 30 is provided in the light flux emitted from the LED light source 20. As a result, it is possible to reliably photograph the dust in the luminous flux illuminated by the light of the LED light source 20.

(3) The light emitted from the LED light source passes through the light guide unit 24, the divergence of the light is suppressed, and the light is radiated into the housing as more parallel light. Therefore, it is possible to prevent the light from the LED light source 20 from entering the camera 30 hidden by the light-shielding portion in relation to the LED light source 20.

(4) Since the reflection suppressing portion 18 is provided on the inner surface of the housing 10 in the region where the light of the LED light source 20 hits, it is possible to prevent the reflected light from entering the lens surface of the camera 30.

(5) Since the LED light source 20 is used instead of the light bulb as the light source, the device can be miniaturized. In addition, the simple configuration makes it possible to photograph small dust.

The present embodiment can be modified in various ways within the scope of the present invention.

The present invention can be widely applied as a device capable of visually confirming dust in the air.

10 Housing 12 Intake port 14 Exhaust port 16 Exhaust fan 18 Reflection suppression unit 20 LED light source 22 Heat dissipation unit 24 Light guide unit 30 Camera 32 Lens 34 Shading unit 40 Display means 50 Power supply 55 Charging external power supply 60 Video capture 65 External storage medium 100 Dust recognition device SW1 to SW3 switch

Claims (5)

With the housing
An LED light source provided in the housing so as to emit light,
A camera provided with a lens for photographing the inside of the housing, and
A light-shielding portion provided between the LED light source and the lens,
The inner surface of the housing includes a reflection suppressing portion that suppresses reflection provided in a region where the light of the LED light source directly or indirectly hits.
The lens surface of the lens is within the extension region of the luminous flux emitted from the LED light source.
The light-shielding portion is provided so that the light from the LED light source does not directly hit the lens surface.
The angle between the direction of the light path and the direction of the camera is 45 to 90 degrees.
The lens surface of the camera is invisible from the emission surface of the LED light source, and the lens surface of the camera is oriented so that the light from the LED light source does not directly hit even when there is no light-shielding portion. And
An exhaust fan is provided to guide the air to the exhaust port so that the air taken in from the intake port crosses the light flux emitted from the LED light source and the air flows toward the camera. Dust recognition device. In claim 1,
A dust recognition device in which the LED light source is provided with a heat radiating portion for radiating heat to the outside of the housing. In claim 1 or 2,
A dust recognition device including a light guide unit that guides light emitted from the LED light source. In any of claims 1 to 3,
The focus of the camera is a dust recognition device set at a position 1 to 10 mm on the luminous flux side of the lens surface. In any of claims 1 to 4,
The region directly or indirectly exposed to the light of the LED light source is a part or all of the inner surface of the housing facing the LED light source, and a part or a part of the inner surface of the housing facing the camera. A dust recognizing device that is at least one of the entire area.

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