KR102194289B1 - Apparatus and Method for Inspecting Cutting-off Ability of Blue or Violet Light - Google Patents

Abstract

Disclosed are an inspection apparatus for inspecting blocking performance of blocking blue or purple light, and an inspection method thereof. The inspection apparatus of the present invention illuminates a blue or purple inspection light toward an object to be inspected, and then photographs the image with a camera from the opposite side. At this time, since the camera is equipped with an optical filter having a band-pass capability that transmits blue or purple light, it is possible to easily check whether the object to be inspected transmits blue or purple light by examining the image.

Description

An inspection device to check the blocking performance of blocking blue or purple light, and the inspection method thereof {Apparatus and Method for Inspecting Cutting-off Ability of Blue or Violet Light}

The present invention relates to an inspection of blocking performance capable of blocking blue or purple light, and more particularly, to an inspection apparatus capable of examining blocking performance of an object to be inspected, and an inspection method thereof.

In general, ultraviolet (UV) rays, which belong to invisible light, are known to be harmful to human eyes, but blue or purple light (hereinafter, simply referred to as'blue light') belonging to visible light is also a harmful light. Blue or purple light has a longer wavelength and less energy than ultraviolet light, but is also called high-energy visible light (HEV) because it has a shorter wavelength and greater energy than other bands of visible light. Unlike ultraviolet light, blue or purple light can permanently damage the eye because most of the light passes through the eye and reaches the retina. Even in terms of vision, blue or purple light may make the object blurry or lower the contrast sensitivity, thereby making the user's vision uncomfortable.

Blue or violet light is light having a wavelength of 380 nm to 500 nm, and in particular, blue or violet light of a wavelength band of 380 nm to 440 nm is known to be harmful. Blue or purple light is also included in sunlight, but it also comes from various LEDs and lighting fixtures such as fluorescent lamps, and also comes out a lot on various display screens in mobile phones and televisions.

Meanwhile, eyeglass manufacturers manufacture and sell blue light-blocking lenses called'Blue Cut Lenses'. The blue-cut lens blocks blue light from external natural light or digital devices such as computers, televisions, mobile phones, and game consoles from entering the eye.

It is an object of the present invention to provide an inspection apparatus capable of inspecting the blocking performance of an object to be inspected, which is known to have blocking performance capable of blocking blue or purple light, and an inspection method thereof.

In order to achieve the above object, the inspection apparatus of the present invention can inspect the blue or purple light blocking performance of the inspection object. The inspection apparatus of the present invention includes a light source unit, a camera unit, an input optical filter, and a display unit.

The light source unit emits light for inspection toward the inspection object. The inspection light has a wavelength belonging to a blue and violet wavelength band, which is an inspection band, and may include, for example, a plurality of light sources emitting light in a wavelength band of 380 nm to 440 nm. In addition, it is preferable that the plurality of light sources are disposed to be spaced apart from each other so that the inspection object and the periphery of the inspection object can be simultaneously illuminated.

The camera unit is disposed to face the light source unit with the inspection object interposed therebetween to photograph the inspection object to generate an image.

The input optical filter is provided at a front end of the camera unit to filter light incident on the camera unit, but has a band pass characteristic to pass an inspection band. For example, as the input optical filter, a band pass filter that transmits light having a wavelength of 380 nm to 440 nm may be used.

The image generated by the camera unit is finally displayed on the display unit. Since the image captured by the camera unit is an image of blue or purple light, the brightness of the inspection object area in the image is determined by the ability to block blue or purple of the inspection object. If the object to be inspected has the ability to block blue or purple wavelengths, the portion of the object to be inspected will appear dark in the image.

According to an embodiment, the camera unit includes an image sensor unit and a lens unit for forming light that has passed through the input optical filter to the image sensor unit.

According to another embodiment, the inspection apparatus of the present invention may further include an inspection object support provided between the light source unit and the input optical filter to fix the inspection object. Here, the inspection object support may include a transfer unit capable of changing a position between the light source unit and the input optical filter.

In addition, the inspection object support may further include a recognition unit for recognizing the inspection object. While the recognition unit recognizes the inspection object, the light source unit is turned on, and the camera unit generates an image.

According to another embodiment, the light source unit may further include an output optical filter. Since the output optical filter has a band-pass characteristic to pass the inspection band, it is possible to filter the wavelength of light emitted from the light source unit.

The present invention also extends to an inspection method of an inspection apparatus. The inspection method of the inspection apparatus of the present invention includes the steps of mounting an input optical filter on the front side of the camera unit; Recognizing the inspection object disposed between the light source unit and the input optical filter; Controlling, by the light source unit, to emit inspection light toward the inspection object according to the recognition of the inspection object; And displaying the light incident through the input optical filter on a display by the camera unit as an image.

The inspection apparatus according to the present invention may inspect whether an inspection object known to have the ability to block blue or purple light can actually block blue or purple light. Since the image captured by the camera unit of the present invention is an image of blue or purple light, the brightness of the area of the object to be inspected in the image is determined by the ability to block blue or purple of the object. If the object to be inspected has the ability to block blue or purple wavelengths, the portion of the object to be inspected will appear dark in the image.

1 is a view showing a test apparatus according to an embodiment of the present invention,
Figure 2 is a block diagram of the inspection device of Figure 1;
3 is a view showing a test apparatus according to another embodiment of the present invention,
4 is a graph of characteristics of an input optical filter applicable to the present invention;
5 is a block diagram of another inspection apparatus according to another embodiment of the present invention;
6 is a flow chart provided to explain the inspection method of the inspection apparatus of the present invention.

The present invention will be described in more detail below with reference to the drawings.

Referring to FIGS. 1 and 2, the inspection apparatus 100 of the present invention may test a blocking performance of blocking light of a specific wavelength band with respect to an object A or B. Since the inspection device 100 irradiates the inspection light toward the inspection object (A or B) and then creates an image with inspection light passing through the inspection object (A or B), the blocking performance of the inspection object (A or B) Can be checked.

The inspection light has a wavelength belonging to the inspection band. The inspection band (wavelength band) of the present invention is a blue or violet region in the visible light band, and is usually a wavelength band of 380 nm to 440 nm. The object to be inspected may not transmit light itself, but it is mainly ① that can basically transmit light, and ② exceptionally, has the ability to block light belonging to the inspection band. For example, blue-cut lenses or glasses may correspond to the object to be inspected. Therefore, even in the inspection object, a portion that does not pass the light itself is difficult to see as an actual inspection target area, and the area that can transmit light will be the inspection target area.

An inspection object with normal blocking ability (A) can block blue or purple light and pass all or part of the rest of the band (for example, visible or infrared light), but the inspection object with or without normal blocking ability (B) will pass all or part of the blue or purple light. Therefore, in the image taken of the inspection object while illuminating the inspection object with the inspection light, if the inspection object area of the inspection object is dark (low brightness), it has the blocking ability, and if it is bright (high brightness), the blocking ability is not.

The inspection device 100 is preferably implemented as a dedicated device for testing the blocking ability of the present invention. Referring to FIG. 1, the inspection apparatus 100 of the present invention includes a light source unit 101, an input optical filter 103, an inspection object support 105, a camera unit 110, and a display unit 130. Include. The input optical filter 103 is mounted on the camera unit 110, and the inspection object support 105 on which the inspection object (A or B) is mounted is disposed between the light source unit 101 and the input optical filter 103. . The light source unit 101 and the camera unit 110 are disposed to face each other with the inspection object support 105 therebetween.

The light source unit 101 includes at least one light source that emits light (inspection light) having a wavelength belonging to the inspection band, and is disposed to face the camera unit 110 to face the inspection object (A or B) and the camera unit ( 110) is emitted for inspection. Therefore, the light source used in the light source unit 101 emits light belonging to a wavelength band of 380 nm to 440 nm corresponding to blue or purple, and, for example, an LED capable of outputting a wavelength of the corresponding band is used, or is required. According to this, the optical filter 101b may be used as in FIG. 2. A typical blue LED may not be appropriate because it mainly outputs blue light in the 470nm band.

On the other hand, it is preferable that the light source unit 101 can sufficiently illuminate the inspection object and the vicinity of the inspection object in consideration of the distance to the inspection object and the size of the inspection object. In addition, it is preferable that the light source unit 101 can illuminate both the horizontally disposed two lenses so that the two lenses can be simultaneously inspected like glasses. For example, as shown in FIG. 2, it is preferable that the light source unit 101 is provided with a plurality of LEDs 101a disposed to be spaced apart from each other to sufficiently illuminate the inspection object A or B. The inspection light emitted from the light source unit 101 passes through the inspection object (A or B), passes through the input optical filter 103, and enters the camera unit 110.

As described above, the light source unit 101 preferably includes an output optical filter 101b that passes the inspection light not only for the purpose of producing the inspection light, but also to regulate the wavelength of the final output inspection light. Do. In terms of its own function, since the output optical filter 101b has the same configuration as the input optical filter 103, the description of the output optical filter 101b described below applies equally.

The input optical filter 103 is an optical filter, and may be mounted on the front side of the camera unit 110 as shown in FIG. 1, or may be implemented in a form embedded in the camera unit 110 according to another embodiment. have. The input optical filter 103 has a band-pass characteristic to pass through the test band, so that light that does not belong to the test band is prevented from entering the camera unit 110. Therefore, the input optical filter 103 uses a filter having a band-pass characteristic for passing a wavelength band of 380 nm to 440 nm as shown in FIG. 4.

Looking only at its own function, the input optical filter 103 has the same configuration as the output optical filter 101b included in the light source unit 101. The input optical filter 103 may be implemented as a single filter, or a band-pass characteristic for passing a wavelength to be inspected by combining a plurality of filters may be implemented. Since the filtering band or wavelength of the input optical filter 103 is the most important factor in determining the performance of the inspection apparatus 100 of the present invention, it is preferable that the filtering band is designed to pass only the inspection band at approximately the same level.

The inspection object support 105 is not an essential configuration of the inspection apparatus 100 of the present invention. However, it is convenient to use the inspection object support 105 when the object to be inspected (A or B) is fixed and disposed between the light source unit 101 and the input optical filter 103 (or the camera unit). The inspection object support 105 is preferably a shape that does not cover the inspection target area of the inspection object (A or B), and may be implemented in various shapes according to the appearance of the inspection object (A or B).

In FIG. 1, the position of the inspection object support 105 is about the center of the light source unit 101 and the camera unit 110, but considering the state of wearing blue-cut glasses, it is very close to or close to the input optical filter 103. It can also be placed in close contact.

According to another embodiment, the inspection apparatus 300 of FIG. 3 may further include a transfer unit 310 for transferring the inspection object support 105 along the optical axis x. The transfer unit 310 illustrated by way of example in FIG. 3 is a guide groove 313 installed on the bottom plate 311 to guide the transfer of the inspection object support 105 and a guide groove attached to the inspection object support 105 It includes a transfer protrusion 315 for supporting the inspection object support 105 while being transferred along the 313.

Referring to FIG. 2, the inspection light incident on the inspection object A having normal blocking performance is reflected or refracted from the surface and proceeds or is absorbed in another direction, and only the inspection light that has moved away from the inspection object A or B It passes through the input optical filter 103 and enters the camera unit 110. In the inspection object B having no blocking performance or abnormality, the inspection light passes directly through the input optical filter 103 and enters the camera unit 110. On the other hand, the light incident to the camera unit 110 may include not only the inspection light emitted from the light source unit 101 but also other lighting or natural light, but mostly only light that is filtered by the input optical filter 103 and belongs to the inspection band. It is incident on the camera unit 110.

The camera unit 110 converts the light that has passed through the input optical filter 103 into a digital image and outputs it to the display unit 130. The display unit 130 is one of user interface means and visually displays an image generated by the camera unit 110.

Referring to FIG. 2, the camera unit 110 includes a lens unit 201 and an image sensor unit 203. The input optical filter 103, the lens unit 201, and the image sensor unit 203 are disposed on the same optical path vertically passing through the center, and are among the light (or images) incident from the inspection object (A or B). It creates a digital image of light belonging to the blue or purple test band.

The camera unit 110 includes a case 110a for blocking external light from entering the image sensor unit 203 without passing through the input optical filter 103, and an image generated by the image sensor unit 203. It also includes a controller 210.

The lens unit 201 images the light passing through the input optical filter 103 on the image sensor unit 203 by adjusting the focal length and the angle of view so that a part or the whole of the inspection object A or B can be photographed. The lens unit 201 is preferably provided between the input optical filter 103 and the image sensor unit 203, but may be provided in front of the input optical filter 103. The lens unit 201 generally uses one lens, but a combination of a plurality of lenses may be used.

The image sensor unit 203 converts light belonging to a band to be inspected into a digital signal to generate a color or black and white image. An inspection band must be included in the processable bandwidth of the image sensor unit 203, and most of the image sensor units 203 can process a blue or purple area.

Since all visible light areas other than blue or purple are removed from the light incident on the image sensor unit 203, the color image generated by the image sensor unit 203 becomes a blue or purple image, and a black and white image It becomes a black-and-white image whose gradation changes according to the incident of blue or purple light. However, the pixel area is displayed brightly according to the incident degree of blue or purple light, and the pixel area to which blue or purple light is not incident is displayed darkly.

In the example of FIG. 1, assuming that the image sensor unit 203 generates a color image, the inspection object support 105 that does not transmit light at all and the lens rim are displayed in black, and the center of the inspection object A The lens part is displayed in blue or purple with very low gradation.

The image sensor unit 203 may generate one still image, but it is preferable to continuously generate images (movies) at a preset frame rate in order to dynamically display the inspection status. The image sensor unit 203 provides the generated image to the controller 210.

The controller 210 controls the overall operation of the inspection apparatus 100 of the present invention. The controller 210 specifically includes an imaging control unit 211 and an inspection control unit 213 to process the inspection process of the present invention.

The photographing control unit 211 controls the light source unit 101 and the image sensor unit 203 to generate an inspection image according to a control command or request from a user. When the light source unit 101 emits the inspection light under the control of the photographing control unit 211, when the inspection object is not located on the inspection object support 105, the inspection light is input to the optical filter 103 and the lens unit ( It is incident directly to the image sensor unit 203 via 201). Therefore, an image with high brightness overall is created. When the user places the inspection object A on the inspection object support 105, all or part of the inspection light is blocked by the inspection object A. Accordingly, the image sensor unit 203 generates an image in which the area of the inspection object is dark.

The inspection control unit 213 provides the image generated by the image sensor unit 203 to the display unit 130. Accordingly, the display unit 130 displays the inspection image to the user.

Example

Referring to FIG. 5, the inspection apparatus 500 of the present invention may further include a recognition unit 501 provided on the inspection object support 503 to recognize an inspection object. For example, the recognition unit 501 may be implemented as a switch that operates mechanically like a limit switch operated by contact with the object A, or a ground contact type such as an infrared sensor or a proximity sensor. Sensors can be used.

The photographing control unit 505 of FIG. 5 may control the light source unit 101 to turn on while the recognition unit 501 recognizes the inspection object A, and control the image sensor unit 203 to generate an image.

Hereinafter, with reference to Figure 6, a brief description of the inspection method of the inspection apparatus 500 of the present invention. First, an input optical filter 103 is mounted on the front surface of the camera unit 100 (S601). Thereafter, when the user places the inspection object A on the inspection object support 503, the recognition unit 501 recognizes the inspection object A (S603). When the inspection object is recognized, the photographing control unit 505 controls the light source unit 101 to emit inspection light toward the inspection object A, and the image sensor unit 203 controls to generate an image at a preset frame rate. Do (S605).

The inspection control unit 213 provides the image generated by the image sensor unit 203 to the display unit 130. Accordingly, the display unit 130 displays the inspection image to the user. The user can check the blocking performance of the inspection object A through the image displayed on the display unit 130 (S607).

In the above manner, the inspection method of the inspection apparatus 500 of the present invention is performed.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and is generally used in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Various modifications are possible by those skilled in the art of course, and these modifications should not be individually understood from the technical idea or perspective of the present invention.

Claims (9)

As a device to check the blue or violet light blocking performance of the glasses to be inspected,
An inspection object support for fixing the inspection target glasses;
A recognition unit for recognizing the inspection target glasses fixed to the inspection object support;
A light source unit comprising a plurality of light sources emitting light having a wavelength of 380 nm to 440 nm, which is an inspection band, and emitting inspection light toward the inspection target glasses while the recognition unit recognizes the inspection target glasses. The inspection light has a wavelength belonging to the blue and violet wavelength bands, which are inspection bands;
A camera unit disposed to face the light source unit with the glasses to be inspected interposed therebetween, and configured to photograph the test object while the recognition unit recognizes the glasses to be inspected to generate an image;
An input optical filter provided at a front end of the camera unit to filter the light incident on the camera unit and have a band pass characteristic for passing the inspection band; And
A display unit for displaying an image generated by the camera unit,
The plurality of light sources are disposed to be spaced apart from each other, thereby simultaneously illuminating the eyeglasses to be inspected and the peripheries of the eyeglasses to be inspected to test the ability of the eyeglasses to be inspected to block light of blue and violet wavelengths.
The method of claim 1,
The camera unit,
An image sensor unit; And
And a lens unit for forming the light that has passed through the input optical filter to the image sensor unit.
delete delete The method of claim 1,
The inspection object support,
And a transfer unit capable of changing a position between the light source unit and the input optical filter.
The method of claim 1,
Wherein the input optical filter is a band pass filter that transmits light having a wavelength of 380 nm to 440 nm.
delete The method of claim 1,
The light source unit
And an optical filter for output having a band-pass characteristic for passing the inspection band, and filtering wavelengths of light emitted from the plurality of light sources.
delete

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