Accommodating container and accommodating body

Abstract

The present invention relates to a container and a container body. The object of the present invention is to provide a container which enables smooth recycling, reduces reading errors of an identification code, and is suitable for retail sales. The container of the present invention includes a container body, and a lid which seals a container body inside, and has an identification code on the upper surface of the lid. The container body includes a plurality of recesses, and has an image which is larger than the identification code. The difference between the diffuse reflectance of the display part and the non-display part of the identification code is larger than the difference between the diffuse reflectance of the image part and the non-image part.

Description

Technical Field

[0001] This invention relates to containers and housings. Background Technology

[0002] Previously, PET (Poly ethylene terephthalate) bottles and other similar containers were known for having labels affixed with information such as the product name, ingredients, shelf life, barcode, QR code (registered trademark), recycling mark, or identification mark. Additionally, labels were used to display designs or images that appealed to consumers, aiming to highlight the product's individuality or enhance its competitiveness.

[0003] On the other hand, marine pollution caused by plastic waste has recently attracted attention, and global efforts to eliminate plastic waste pollution are active, leading to an increasing demand for the recycling of containers. Here, the recycling of containers refers to the process of converting separately recycled and used containers into sheets that are used as raw materials for remanufacturing containers.

[0004] To facilitate such recycling, it is preferable to recycle thoroughly according to the material of the collection container or label. However, the time-consuming process of peeling the labels off the collection container is a constraint on thorough recycling.

[0005] Relatedly, the technology of providing unlabeled container bodies by directly forming patterns representing information such as names or ingredients on the container body using lasers is well known.

[0006] For example, to improve the visibility of directly recorded information, enable direct recording of large amounts of information such as images, and enable high-speed direct recording at a commercial level, a receiving container is proposed, which is formed by an assembly of microstructures to create a visible area through which information such as numbers, symbols, and images can be viewed (for example, see Patent Document 1).

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2021-176648

[0008] Patent Document 1 describes an example of setting a one-dimensional barcode by irradiating the upper surface of a beverage bottle cap with a laser beam. However, the one-dimensional barcode in Patent Document 1 is drawn directly using only a laser beam. Therefore, the difference in diffuse reflectance (contrast) between the display and non-display areas of the barcode is insufficient, which can lead to reading errors. Summary of the Invention

[0009] The purpose of this invention is to provide a receiving container that can be easily recycled, reduces identification code reading errors, and is suitable for retail sales.

[0010] To address the aforementioned issues, the present invention provides a receiving container comprising a container body and a lid for sealing the contents within the container body, characterized in that:

[0011] An identification code is located on the top of the cover.

[0012] The container body includes multiple recesses, each having an image with an area larger than the identification code.

[0013] The difference in diffuse reflectance between the display portion and the non-display portion of the identification code is greater than the difference in diffuse reflectance between the image portion and the non-image portion.

[0014] The effects of this invention are as follows:

[0015] According to the present invention, a receiving container that can be easily recycled, reduces identification code reading errors, and is suitable for retail sales can be provided. Attached Figure Description

[0016] Figure 1 (A) is a schematic diagram showing the diffuse reflection state of light on the surface of the container body before laser processing.

[0017] Figure 1 (B) is a schematic diagram showing the diffuse reflection state of light on the surface of the container body with multiple recesses formed by laser processing.

[0018] Figure 1 (C) is a schematic diagram showing the diffuse reflection state of light on the surface of the container body with multiple recesses formed by laser processing and the contents contained therein.

[0019] Figure 1 (D) is a diagram representing an example of a one-dimensional barcode as an identification code formed on the cover.

[0020] Figure 2 This is an example of an image depicting an area on the body of a container that is larger than the identification code on the lid.

[0021] Figure 3 This is another example of an image depicting an area on the body of a container that is larger than the identification code on the lid.

[0022] Figure 4 (A) is a diagram illustrating an example of a photographic method for the main body of a container.

[0023] Figure 4 (B) is a diagram showing the state in which a white diffusion surface is set on the side of the container body in the method of photographing the container body.

[0024] Figure 5It is a schematic diagram representing the image P of the container body and the part Q outside the image in the photograph of the container body.

[0025] Figure 6 It is a graph showing the relationship between the G signal and brightness.

[0026] Figure 7 It represents the brightness (L) of the image. * A graph showing the relationship between 0) and subjective evaluation points.

[0027] Figure 8 It is the difference in brightness between the image and the area outside the image (ΔL). * A graph showing the relationship between ( ) and subjective evaluation points.

[0028] Figure 9 It is a graph representing the relationship between x and Y in the equation Y = 1 - exp(-x).

[0029] Figure 10 It is a graph representing the relationship between subjective evaluation points and visual recognition values.

[0030] Figure 11 This is a graph showing the relationship between the recognizability value of the barcode laser-written onto the container body and the success rate of reading.

[0031] Figure 12 This is a graph showing the relationship between the symbol contrast of a Gabe Newell barcode and its readability success rate.

[0032] Figure 13 It is a graph showing the relationship between visibility value and rating level.

[0033] Figure 14 It is a graph showing the relationship between the processing ratio and the visual value.

[0034] Figure 15 (A) is a diagram representing an example of an image containing multiple concave and non-concave portions.

[0035] Figure 15 (B) is another example of an image that contains multiple concave and non-concave portions.

[0036] Figure 15 (C) is another example of an image containing multiple concave and non-concave portions.

[0037] Figure 15 (D) is another example of an image that contains multiple concave and non-concave portions.

[0038] Figure 15 (E) is another example of an image that contains multiple concave and non-concave portions.

[0039] Figure 15 (F) is another example of an image that contains multiple concave and non-concave portions.

[0040] Figure 16 (A) is a diagram showing an example where the size of the machined part constituting the recess is less than 1 point width, which is determined by the resolution.

[0041] Figure 16 (B) is another example of a case where the size of the machined part constituting the recess is less than 1 point width, which is determined by the resolution.

[0042] Figure 16 (C) is another example of a case where the size of the machined part constituting the recess is less than 1 point width, which is determined by the resolution.

[0043] Figure 17 This is a schematic diagram representing an example of a one-dimensional barcode.

[0044] Figure 18 This is a diagram illustrating the bars and spaces in a one-dimensional barcode.

[0045] Figure 19 It is a diagram showing the positional relationship between the one-dimensional barcode placed on the lid and the image placed on the main body of the container.

[0046] Figure 20 (A) is a diagram of a typical plastic bottle cap with a barcode.

[0047] Figure 20 (B) is a diagram in which the length of the bar of the one-dimensional barcode placed on the top of the cover is set to be different in the short side direction of the bar at the center and the ends. Detailed Implementation

[0048] Hereinafter, the embodiments for implementing the invention will be described with reference to the accompanying drawings. In the drawings, identical components are labeled with the same symbols, and repeated descriptions are sometimes omitted. Furthermore, the embodiments shown below are examples of apparatuses used to embody the technical concept of the present invention, and the present invention is not limited thereto. Unless specifically stated otherwise, the dimensions, materials, shapes, and relative arrangements of the constituent parts described below are not intended to limit the scope of the present invention, but are merely illustrative. Additionally, to clearly illustrate the size and positional relationships of the components shown in the drawings, sometimes exaggerated representations are used.

[0049] (Collect container)

[0050] The receiving container of the present invention includes a container body and a cover for sealing the contents within the container body. An identification code is provided on the top of the cover. The container body includes a plurality of recesses and has an image with an area larger than the identification code. The difference in diffuse reflectance between the display portion and the non-display portion of the identification code is greater than the difference in diffuse reflectance between the image portion and the non-image portion.

[0051] In existing technologies, even if a laser can be used to trace the image on a beverage bottle, the visibility can vary due to differences in the color or absorbency of the liquid containing the bottle, leading to frequent barcode reading problems. Furthermore, if barcodes are placed on the cap instead of the bottle itself, the barcode size becomes very small. In this case, if the barcode contrast is low, reading problems will also frequently occur. Therefore, it is desirable to provide a container that allows for stable reading of laser-written barcodes based on the contents (liquid) inside the beverage bottle, establishing a criterion for this purpose, and ensuring that when a barcode is placed on the cap, the combination of the cap's color and the barcode's color provides sufficient contrast.

[0052] First, the image comprising multiple recesses formed on the container body will be explained. An image consisting of multiple recesses is formed on the surface of the container body through laser processing, etc. When these recesses are assembled, the image is compared with the image before processing (…). Figure 1 Compared to (A), the surface diffuse reflectance increases, causing cloudiness and forming a visible area. Figure 1 (B)).

[0053] Set the difference (contrast) between the image portion and the non-image portion to "Cbottle". Due to the difference in diffuse reflectance between the image portion and the non-image portion, the image of processed text, etc., can be viewed even without the use of ink or the like.

[0054] On the container body, the bar portion of the one-dimensional barcode, which serves as an identification code, is designated as a processing section. Figure 1 (B)), set the blank area as a non-processing section. Figure 1 (A) can also form a barcode with reversed brightness compared to one printed on paper with ink (the bars are bright, and the container body is dark). In this case, the difference between the high-contrast diffuse reflectance (bars) and the low-contrast diffuse reflectance (container body) results in a consistently positive contrast value. Furthermore, in this specification, the image formed by surface laser processing, etc., is described as having multiple recesses, but it is self-evident that when viewed from a fine angle, it has a raised or recessed shape.

[0055] In this invention, such as Figure 1As shown in (D), a one-dimensional barcode 2 serving as an identification code is provided on the top of the container cover 8. An image with an area larger than the identification code, including multiple recesses, is formed on the surface of the container body through laser processing or the like. The difference in diffuse reflectance between the display portion and the non-display portion of the identification code is greater than the difference in diffuse reflectance between the image portion and the non-image portion. That is, the characteristic is that if the difference in diffuse reflectance (contrast) between the display portion and the non-display portion of the identification code on the container cover is set to "Ccap", then the following formula is satisfied: Cbottle < Ccap. Because Cbottle < Ccap, a reliable identification code without reading errors can be provided on the container.

[0056] The difference in diffuse reflectance between the display and non-display areas of the identification code represented by "Ccap" is called symbol contrast, and is expressed by the following formula (2). In the case of a barcode printed on paper with ink in reverse brightness (the bar is bright and the container body is dark), formula (2) is negative if it does not have an absolute value. Therefore, with an absolute value, as in the case of contrast, the value becomes positive.

[0057] Equation (2):

[0058] Symbol contrast

[0059] =│Diffuse reflectance of the non-display area of ​​the identification code - Diffuse reflectance of the display area of ​​the identification code│

[0060] The "display area" of an identification code refers to the bars themselves, in the case of a barcode. The "non-display area" refers to the background area between the bars. For example, if a black barcode is printed on a white background on green material, the black area is the display area, and the white area is the non-display area.

[0061] Here, diffuse reflectance can be measured using an integrating sphere spectrophotometer, such as the Xrite CIX6 series. An integrating sphere spectrophotometer can measure only the diffuse reflectance excluding positively reflected light. This is especially important in the case of transparent resins, where light transmitted through the sample is reflected elsewhere. The diffuse reflectance of the surface is measured by placing the sample on an optical trap so that transmitted light does not return from the trap, thus excluding the positively reflected light from the positively reflected light.

[0062] The identification code on the cover can be printed with ink or processed by laser. Additionally, such as... Figure 1 As shown in (D), a white base is printed on the identification code area of ​​the cap, and the printed strip can also be printed directly on the cap. If the cap is dark in color and the strip is printed in black, the contrast of the identification code will be reduced; therefore, it is preferable to print a separate base color in the identification code area. Furthermore, the cap printing can be done in advance or as needed when filling the container with contents (beverages, etc.).

[0063] However, when a barcode is placed on the cover as an identification code, it becomes a very small barcode. If the small barcode does not have sufficient contrast, reading errors increase. Therefore, a benchmark is needed to evaluate and determine the contrast of the symbols on the small barcode on the cover.

[0064] The container of the present invention has a container body and a lid that seals the contents inside the container body.

[0065] <Container Body>

[0066] As the main body of the container, there are no special restrictions on its material, shape, size, structure, color, etc.

[0067] You can choose the appropriate option based on your purpose.

[0068] There are no particular restrictions on the material used for the main body of the container; it can be chosen appropriately according to the purpose. For example, resin and glass can be listed.

[0069] Resins used as the main body of containers include, for example, polyvinyl alcohol (PVA), polybutylene adipate / terephthalate (PBAT), polyethylene terephthalate succinate, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), polyurethane, epoxy resin, bio-polybutylene succinate (bioPBS), polylactic acid blend (PBAT), starch blended polyester resin, polybutylene terephthalate succinate, polylactic acid (PLA), polyhydroxybutyrate / hydroxyhexanoate (PHBH), polyhydroxyalkanoic acid (PHA), bioPET30, biopolyamide (PA) 610, 410, 510, bioPA1012, 10T, bioPA11T, MXD10, biopolycarbonate, biopolyurethane, bioPE, bioPET100, bioPA11, bioPA1010, etc. They can be used alone or in combination of two or more. From an environmental impact perspective, biodegradable resins such as polyvinyl alcohol, polybutylene adipate / terephthalate, and polyethylene terephthalate succinate are preferred.

[0070] There are no particular restrictions on the shape of the main body of the container; it can be selected appropriately according to the purpose. For example, bottle-shaped, cylindrical, square prism-shaped, box-shaped, and cone-shaped containers are examples. Among these, bottle-shaped is preferred.

[0071] The bottle-shaped container body includes a mouth, a shoulder connected to the mouth, a torso connected to the shoulder, and a bottom connected to the torso.

[0072] There are no particular restrictions on the size of the container body; it can be selected appropriately according to the container's intended use.

[0073] There are no particular restrictions on the structure of the main body of the container; it can be selected appropriately according to the purpose. For example, it can be a single-layer structure or a multi-layer structure.

[0074] Examples of container body colors include colorless transparent, colored transparent, and colored opaque. In particular, in colorless transparent containers, the visibility of the laser-written image deteriorates, resulting in the inability to read barcodes written to the container body. Therefore, this invention is necessary.

[0075] <like>

[0076] The surface of the container body contains multiple recesses, forming an image with an area larger than the identification code on the lid. Because the image has non-recessed areas, it is not necessary to illuminate the entire image with laser light. Therefore, productivity is significantly improved corresponding to the proportion of non-recessed areas. However, if the proportion of non-recessed areas increases, its visibility deteriorates; therefore, conditions should be set for the proportion of non-recessed areas.

[0077] The term "like" encompasses information such as text, symbols, graphics, images, and codes. Specifically, it includes information such as name, ingredients, identification number, manufacturer's name, manufacturing date and time, shelf life, identification code (barcode, QR code), recycling mark, or label.

[0078] In the above examples, the identification code is crucial information. When managing goods, business units / departments, assets, etc., it is necessary to assign "codes" such as numbers or symbols for identification. These codes are generally called "identification codes."

[0079] Identification codes include, for example, "product identification codes" such as JAN codes. JAN codes are used for management, allowing the cashier to identify the purchased item by displaying an international product identification number (IOU) indicated by dots. They are typically used as barcodes on products or packaging. In addition, two-dimensional codes, which can hold more information, are also a type of identification code; the most famous of these is the QR code (registered trademark). Since two-dimensional codes have the same effect, this instruction manual will use barcodes as an example of identification codes.

[0080] The recess is formed by multiple machining parts, which are arranged along the first scanning direction (main scanning direction) and can be either dot-shaped or line-shaped. Preferably, the machining parts are circular or elliptical in the top view.

[0081] In the recess, multiple processing sections are arranged linearly along the first scanning direction, either contacting or overlapping, which is suitable from the perspective of visibility and productivity. Furthermore, the image depicted on the container body is intended to serve as a substitute for a label; therefore, the image must be drawn with an area larger than the area of ​​the barcode on the lid. An image containing text or pictures drawn with this area becomes an invention for clear identification. The area described herein refers to the area of ​​the region; in the case of a barcode, it is... Figure 2 The area within the dashed lines, the approximate area of ​​the image drawn by the laser onto the container body, is calculated as follows: Figure 3 Within the dashed lines, let the sum of the areas of these images representing the entire bottle be represented.

[0082] Non-recessed areas refer to flat areas of the container body that do not form recesses.

[0083] The laser scanning direction has two directions: the main scanning direction and the sub-scanning direction. The main scanning direction and the sub-scanning direction are perpendicular to each other.

[0084] The main scanning direction is the direction in which the laser irradiation device moves, and the secondary scanning direction is the direction in which the container body, which is the object of laser processing, moves.

[0085] The first scanning direction is the main scanning direction in laser processing, and the second scanning direction is the secondary scanning direction in laser processing.

[0086] Here, as Figure 1 As shown in (B), multiple recesses 12 are formed on the surface of the container body 1 by laser processing or the like. If these multiple recesses 12 are assembled to form an image 11, then... Figure 1 Compared to before laser processing, as shown in (A), the diffuse reflectance of the surface of container body 1 increases. That is, as... Figure 1 As shown in (B), a turbid image 11 is formed. The denser the collection of the multiple recesses 12, the greater the turbidity and the easier it is to see. On the other hand, laser processing takes time and reduces productivity, or causes deformation of the container body 1 or material deterioration due to heat, resulting in color changes. Therefore, it is preferable to have a density collection that does not affect visibility.

[0087] Furthermore, visibility is determined not only by the diffuse reflectance generated by the multiple recesses 12, but also by the influence of transmitted light from the contained object 9 housed within the container body 1. Figure 1 (C)). When the container body 1 is made of a transparent material such as plastic or glass, especially as Figure 1 As shown in (C), the effect of transmitted light from the containment 9 stored inside the container body 1 increases.

[0088] When an object is contained within a container, the visibility value of the image containing the recess changes depending on the type or color of the object, and sometimes the reading of barcodes, which are important information, becomes unstable.

[0089] In addition, when there is an assembly of multiple recesses 12 with a density such that 11 does not reduce productivity, the effect of transmitted light from the non-recesses 13 also needs to be considered.

[0090] Based on the above, the inventors, through repeated research, established the following evaluation method: evaluating the processing condition of the surface of the container body and the visibility of the contents contained within the container body, determining whether the barcode formed on the container body can be reliably read, establishing an evaluation method for situations where a barcode is set on the lid, and using this method to establish an evaluation method for the container and visibility of a container that reliably reads the barcode as a whole.

[0091] First, the evaluation method for visibility will be explained. The evaluation method involves photographing the main body of the container and measuring the brightness of each part, both from the visible image and from the non-visible image.

[0092] Photographic methods as the main body of a container, such as Figure 4 As shown in (A), the process was carried out in a darkroom 42 environment in order to prevent the shape of the container body 1 from being reflected onto the surface of the container body 1. Figure 4 In (A), 43 represents a camera. For example... Figure 4 As shown in (B), the light source 41 does not capture the orthographic reflection component of the surface of the container body 1. A planar light source is positioned at a predetermined angle. To ensure that the influence of the contents 9 inside the container body 1 is reflected in the photographic image, a pair of white diffusion surfaces 44 are preferably provided on the side of the container body 1. Specifically, the photographic process is carried out under the conditions described below. This allows for the acquisition of an image that closely approximates images seen in a normal environment.

[0093] <Photographic Conditions in Visual Evaluation Methods>

[0094] like Figure 4 As shown in (A), a camera 43, a sample (container body 1), and a light source 41 are set up in a darkroom.

[0095] The light source is positioned in a diffuse illumination location (relative to the sample at an angle above, etc., in a position where the positive reflection component of the processed surface is not detected by the camera; the light source position can be at an angle below or to the side).

[0096] Setting a white side on the sample can also take into account transmitted light from the surrounding area.

[0097] The photography conditions are set as follows to ensure that the white reading value is not saturated.

[0098] -Photography Conditions-

[0099] Camera: Basler acA3088-57μm area scanning camera

[0100] Lens: Ricoh Lens FL-CC2514-2M (F1.4 f25mm 2 / 3)

[0101] Aperture: F1.4

[0102] Exposure time: 20000 (μs)

[0103] Photography distance: 500 mm

[0104] Light source: LED tracer

[0105] The state in which the contents are contained within the container body.

[0106] The brightness of the image and the area outside the image is measured from the photographed image. For example... Figure 5 As shown, brightness is calculated from the output values ​​of image P and the portion Q outside the image. The camera's output values ​​vary depending on factors such as image size; considering potential deviations, it is preferable to use values ​​in millimeters. 2 ~ tens of mm 2 The average value of the left and right regions, etc.

[0107] The conversion to brightness is performed using a camera to measure the known brightness (L) under the conditions of measuring the container body. * When taking a picture of a scene, the brightness can be calculated based on the camera's readings (G signal) and the known brightness, as follows.

[0108] -G signal and brightness conversion-

[0109] Take a color image (grayscale image) with known brightness and approximate it using an nth-degree polynomial. As an example, the G signal is converted into brightness using the cubic polynomial shown below.

[0110] L * = Lab_1st×G1+Lab_2nd×G2+Lab_3rd×G3+Lab_const

[0111] Lab_1st = 0.461535

[0112] Lab_2nd = -0.000281

[0113] Lab_3rd = 0.000000

[0114] Lab_const = 1.211053

[0115] Figure 6This is a graph showing the relationship between the G signal and the brightness calculated according to the above formula. Figure 6 Contribution rate r 2 =0.997.

[0116] -Subjective Evaluation-

[0117] For samples where the laser processing conditions inside the container body (PET bottle) have been changed, as shown below, the contents contained in the above samples have been changed, and subjective evaluations have been conducted. The evaluated samples have been statistically evaluated using Shufe's pairwise comparison method to obtain the subjective evaluation score.

[0118] Samples: 6 types with altered processing conditions

[0119] Items contained: water, coffee, tea

[0120] Subjective evaluation method: Shufe's pairwise comparison method

[0121] Evaluators: 3 (each evaluation conducted 2 times)

[0122] Evaluation 1: All samples were water.

[0123] Second evaluation: Water (2 bottles), Coffee (2 bottles), Tea (2 bottles)

[0124] Third evaluation: Water (1 bottle), Coffee (3 bottles), Tea (2 bottles)

[0125] Evaluation environment: Office room

[0126] The obtained subjective evaluation score and image brightness (L) * 0), and the difference in brightness between the image and the area outside the image (ΔL) * The relationship is as follows: Figure 7 and Figure 8 As shown. Using Shufe's pairwise comparison method, a higher subjective rating score indicates better subjective recognition. Figure 7 and Figure 8 Within the image, as shown by the area enclosed by the dashed line, there are samples with poor correlation. These are the images' brightness (L...). * 0) Significantly low brightness (ΔL) * Small, or samples in either of these two states.

[0127] Even for such samples, we use a highly correlated formula to derive the image brightness L. * 0 using (1-exp(ΔL) * Multiplication of numbers (1). For example Figure 9 As shown, Y = (1 - exp(-x)). If x decreases, it approaches Y = 0. Therefore, equation (1) indicates that if the brightness difference (ΔL) *The smaller the size, the worse the visual perception.

[0128] Therefore, the recognition value is represented by the following equation (1):

[0129] Recognition value = b0·L * 0·(1-exp(b1·ΔL * Equation (1)

[0130] In equation (1), L * 0 represents the image's brightness, ΔL * It is the difference between the brightness of the image and the brightness of the parts outside the image.

[0131] b0 is a positive real number, preferably around 0.2.

[0132] b1 is a negative real number, preferably around -0.2.

[0133] The visual recognition value represented by the numerical formula (1) indicates that the higher the brightness of the image, the higher the visual recognition. If the brightness difference between the image and the parts outside the image disappears, the visual recognition disappears.

[0134] Here, the recognition value expressed by the formula (1) calculated with b0=0.195 and b1=-0.193 is as follows: Figure 10 As shown, this indicates that the visual recognition value has a very high correlation with the subjective evaluation score (one-to-one comparison method) when processing conditions and the contents contained within the container body are changed (R). 2 =0.943).

[0135] - Evaluation of barcode reading on the container body -

[0136] The following study investigates the relationship between the recognizability value of a barcode written with laser onto the container body and the success rate of reading the barcode.

[0137] By changing the laser processing conditions inside the container body (PET bottle) and writing a barcode, as shown below, the contents contained in the sample are changed, and the ability to read the barcode by a barcode reader is evaluated to determine the reading success rate.

[0138] Samples: 6 types with altered processing conditions

[0139] Containers: Water, coffee, milk coffee, tea, soy sauce

[0140] Barcode reader: BISCOM BC-BR900L (LED type)

[0141] Can it be read? Successfully read within 1 second.

[0142] Success rate: The success rate is calculated based on the number of successful reads after 10 read attempts.

[0143] Evaluation environment: Inside the office room

[0144] Among the barcode readers used here, there are one-dimensional barcode readers and two-dimensional barcode readers. Two-dimensional barcode readers have overwhelmingly higher reading speed and performance for reading barcodes, including blurred barcodes or barcodes read simultaneously. Conversely, considering that people usually need to be able to read barcodes throughout society, they inquire whether the reading of a one-dimensional barcode reader is successful. Therefore, the above-mentioned device is used as a one-dimensional barcode reader in this embodiment.

[0145] exist Figure 11 In this study, each of the aforementioned samples was placed with its own contents, and its visibility value was measured. The barcodes written on each sample were read using a barcode reader, and the relationship between the visibility value and the reading success rate was summarized. As a result, it was found that when the contents of each sample were placed inside, the reading became unstable when the visibility value of the barcode, expressed by the above formula (1), was below 14, and if it was even lower, it was almost impossible to read. That is, by using this indicator, the reading quality of the laser-written barcode can be determined regardless of what kind of contents (liquid) are placed inside the container body. When the visibility value is determined to be below 14, it is possible to reliably and quickly determine if a barcode needs to be placed on the bottle cap.

[0146] -Barcode reading evaluation on the cover-

[0147] If a barcode needs to be placed on the top of the cover due to the above-mentioned determination, it becomes a very small barcode. Small barcodes, if lacking sufficient contrast, will result in more reading errors. Therefore, a benchmark for evaluating / determining the symbol contrast of the small barcode on the cover is needed. The symbol contrast can be calculated using the following formula (2):

[0148] Equation (2):

[0149] Symbol contrast

[0150] =│Diffuse reflectance of the non-display area of ​​the identification code - Diffuse reflectance of the display area of ​​the identification code│

[0151] In other words, as part of the overall design of the container, the lid can be made of various colored materials. If the color of the barcode printed on it is the same as the color of the lid, the contrast of the symbol becomes low. In this case, more errors occur when reading the small barcode on the lid.

[0152] In light of these circumstances, the relationship between the symbol contrast of the reduced-size barcode printed on the cover and the barcode reading success rate is investigated.

[0153] The success rate of barcode reading was evaluated by changing the color of the lid and the color of the barcode printed on it. Here, the lid color is recorded, but in the actual experiment, a polypropylene plate with colors that mimic the lid was used. A barcode of various colors was printed on this plate at a size (50% reduction) that could be printed on the lid, and the reading performance of this sample was investigated.

[0154] Cover colors (polypropylene sheet): white, black, dark green, yellow

[0155] Barcode colors: white, black, light green, light yellow, brown, purple

[0156] Barcode reduction rate: 50%

[0157] Barcode reader: BISCOM BC-BR900L (LED type)

[0158] Can it be read? Successfully read within 1 second.

[0159] Success rate: The success rate is calculated based on the number of successful reads after 10 read attempts.

[0160] Evaluation environment: Inside the office room

[0161] exist Figure 12 In this study, the symbol contrast of the above samples was measured, and the barcodes written to each sample were read using a barcode reader. The relationship between symbol contrast and reading success rate was summarized. As a result, among caps (polypropylene plates) printed with barcodes of various colors, a symbol contrast of 30% or higher consistently resulted in a 100% reading success rate. That is, by using this indicator, regardless of the color of the cap used in the design, even with a small barcode on the cap, the reading quality of the barcode can be determined, and it is possible to quickly and reliably determine that barcodes with a symbol contrast of 30% or higher must be placed on the cap.

[0162] As mentioned above, when using a barcode reader to read the barcode written on the container body,

[0163] When the visibility value, as expressed by equation (1) above, is 14 or less, the reading success rate decreases. However, if illustrations or text can be clearly seen even with a visibility value of 14 or less, the intended purpose can still be achieved. An evaluation of good laser writing conditions for clear visibility in laser processing will be conducted.

[0164] <Subjective Evaluation Methods>

[0165] For samples with laser-processed images (text) under the following conditions, a subjective evaluation of the image visibility was conducted, using a 5-level scale. The results are as follows: Figure 13 As shown.

[0166] -Evaluation Criteria-

[0167] Judges: 30

[0168] Samples: The laser processing conditions are variable, forming 5.5 pt text. The contents (water, tea, etc.) are also variable depending on the sample, totaling 10 types.

[0169] Evaluation environment: General office interior

[0170] Judgment method: The judgment level is divided into the following 5 levels, and the judge will conduct a subjective evaluation.

[0171] [Rating Level]

[0172] 1: Cannot be read

[0173] 2: Difficult to read

[0174] 3: Can read

[0175] 4: Easy to read

[0176] 5: Easiest to read

[0177] according to Figure 13 The results show that, due to the subjective nature of the evaluation, there was a slight bias. The average visual recognition score was 2 or higher, which corresponds to a reading quality level of 3 or higher. Furthermore, when the visual recognition score was 6 or higher, any judge would rate it as level 5 (easiest to read).

[0178] In view of the above, the relationship between the area ratio of multiple concave parts relative to the image area [(area of ​​multiple concave parts / area of ​​the image) × 100] (hereinafter sometimes referred to as the "processing ratio") and the recognition value is studied.

[0179] like Figure 14 As shown, in areas with low processing ratios, there is a correlation between processing ratio and visibility; the lower the processing ratio, the worse the visibility. When the processing ratio is above 50%, the visibility value is approximately 5 or higher, and even when the processing ratio is above 40%, the visibility value is still above 2. That is, the lower the processing ratio, the higher the productivity; for example, if the processing ratio is 50%, it simply translates to twice the productivity. However, when the processing ratio is less than 40%, although productivity is high, the quality results in a low visibility value. If the processing ratio increases, visibility improves, but the visibility value remains almost unchanged from a processing ratio of 85%. That is, a processing ratio of 85% shows the highest visibility value, and a 15% increase in productivity can be expected.

[0180] As can be seen from the above, a processing ratio of 40% to 85% is preferred, balancing visibility and productivity. A processing ratio of 40% or higher allows for both high productivity and excellent visibility. Furthermore, a processing ratio of 50% or higher results in images with the highest subjective evaluation rating.

[0181] then, Figure 15 (A)~ Figure 15 (F) represents a specific example of image 11 that contains multiple concave and non-concave portions.

[0182] The recess 12 is formed by a plurality of machining portions 47, which are arranged in a linear pattern, such as... Figure 15 (B) Figure 15 (C) and Figure 15 As shown in (F), from a visual perspective, it is preferable that multiple processing parts 47 contact or overlap and are arranged in a linear form.

[0183] Furthermore, such as Figure 15 As shown in (F), multiple processing units 47 are arranged in a linear pattern along the first scanning direction (main scanning direction), as follows: Figure 15 As shown in (C), the recess 12 is configured as a dot along the second scanning direction, and the writing speeds of the two cases are compared. Figure 15 (F) and Figure 15 (C) Also, A in the figure is set to 120 μm, and B to 200 μm. Additionally, in these figures, the cylindrical container is bent in the left-right direction. Under these conditions, a 25 cm... 2 When writing, such as Figure 15 As shown in (F), when multiple processing units 47 are arranged in a linear pattern along the first scanning direction (main scanning direction), such as... Figure 15 As shown in (C), when the recess 12 is arranged in a dotted pattern along the second scanning direction, compared with the above two cases, the former has a writing speed that is more than twice as fast. This means that the case where multiple processing units 47 are arranged in a linear pattern along the first scanning direction (main scanning direction) has high productivity.

[0184] like Figure 15 (A) Figure 15 (D) and Figure 15 As shown in (E), when the recess 12 is arranged in a dot shape along the first scanning direction, it is easily affected by the transmitted light of the non-recess 13 around the processing part 47. However, by providing non-recess 13 between the recesses 12, it is possible to further prevent color changes caused by body deformation or material deterioration due to heat generation.

[0185] The processing ratio is calculated based on the width A of the processing portion 47 constituting the recess in the second scanning direction orthogonal to the first scanning direction and the width A of the processing portion 47 in the second scanning direction plus the width B of the non-recessed portion 13 in the second scanning direction. For example, in the case of forming an image 11 with a resolution of 200 dpi, such as Figure 15 As shown in (A), when the machining section 47 is dotted, the machining ratio = (A / 2). 2 *π / B 2 When A=90μm and B=127μm, the processing ratio is 40%. Furthermore, when the processing section 47 is in contact, for example, when A=127μm and B=127μm, the processing ratio is 79%.

[0186] In addition, such as Figure 15 As shown in (B), when the processing units 47 are arranged in a linear configuration overlapping along the first scanning direction, the processing ratio is A / B. When A = 50 μm and B = 127 μm, the processing ratio is 40%. In addition, when the processing units 47 are in contact, for example, when A = 120 μm and B = 127 μm, the processing ratio is 95%.

[0187] The arrangement of the processing units 47 can also be either longitudinal or transverse. Figure 15 (C)), the width A of the second scanning direction of the processing section 47 and the width B of the second scanning direction of the non-recessed section 13 need not be the same in the image 11. Figure 15 (D) Figure 15 (E) and Figure 15 (F) can also be configured randomly.

[0188] Furthermore, from the viewpoint of improving visibility, it is preferable that the width of the recess in the second scanning direction (sub-scanning direction) orthogonal to the first scanning direction is less than or equal to one dot width at a specified resolution. The specified resolution refers to, for example, 200 dpi.

[0189] For example, in the case of forming an image with a resolution of 200 dpi, such as Figure 16 (A) Figure 16 (B) and Figure 16 As shown in (C), for example, if the width C of the second scanning direction (sub-scanning direction) of the smallest point is set to 127 μm, and the width A of the second scanning direction of the processing part 47 plus the width B of the second scanning direction of the non-recessed part 13 is set to 40 μm, then laser processing is performed so that three rows of recesses (straight lines) 12 composed of multiple processing parts 47 are arranged within the width C of the second scanning direction of the smallest point. Therefore, the surface of the container body can be roughened more finely, and the visibility is improved.

[0190] In addition to a width B of 40 μm in the second scanning direction, the non-recessed portion 13 is also configured with two columns of dots or lines with a width B of 63 μm in the second scanning direction, and 1.5 columns of dots or lines with a width B of 80 μm in the second scanning direction. Even in these cases, visibility is improved in the same way as in the case where the width B in the second scanning direction of the non-recessed portion 13 is 40 μm.

[0191] Furthermore, by ensuring a processing ratio of 40% to 85%, good visibility is achieved, the processing area is reduced, productivity is improved, and deformation or material changes of the container body due to heat generation can be prevented.

[0192] The arrangement of lines or dots in the processing section 47 can be any configuration in the longitudinal or transverse direction. The width A of the second scanning direction of the processing section 47 and the width B of the second scanning direction of the non-recessed section 13 do not necessarily have to be the same in the image 11, and can also be randomly configured.

[0193] <cover>

[0194] There are no particular restrictions on the material, shape, size, structure, color, etc. of the lid; it can be selected appropriately according to the purpose.

[0195] There are no particular restrictions on the material used for the lid; it can be chosen appropriately depending on the purpose. Examples include resin, glass, metal, and ceramic. However, from a formability perspective, resin is preferred.

[0196] The same resin used for the container body can be used as the resin for the lid.

[0197] As for the color of the cover, examples include colored opaque and colored transparent. From the viewpoint of image readability, colored opaque is preferred.

[0198] As for the shape and size of the lid, there are no particular restrictions as long as it can seal the opening of the container body. It can be selected appropriately according to the purpose.

[0199] There are no particular restrictions on the structure of the lid, and it can be appropriately selected according to the purpose. For example, it is preferable to have a first part that leaves the container body when opened and a second part that remains in the container body.

[0200] Preferably, the side surface of the first part has an uneven shape to prevent the hand from slipping when opening. Preferably, the side surface of the second part does not have an uneven shape and is flat.

[0201] In this invention, an identification code is provided on the top of the cover.

[0202] As identification codes, examples include one-dimensional barcodes and two-dimensional barcodes. From a universality perspective, one-dimensional barcodes are preferred. Generally, when people talk about barcodes, they are referring to one-dimensional barcodes, but the ISO / IEC standard also includes two-dimensional barcodes, which are then called barcodes.

[0203] A barcode is a general term for symbols represented by bars. Barcodes contain information required for circulation or commodity management, such as the country or industry name, product name, and price, and can be read using portable terminals or barcode readers.

[0204] Here, Figure 17 This is a schematic diagram representing an example of a one-dimensional barcode.

[0205] The "quiet area (blank)" is the blank space on the left and right sides of the barcode symbol. If this blank space is insufficient, the barcode cannot be read. The left and right sides need to be at least 10 times the width of the narrow bar (minimum element).

[0206] "Start / stop characters" are literals that indicate the beginning and end of data.

[0207] The start / stop character varies depending on the type of barcode. In CODE39, it is "*", and in NW-7, it is "a", "b", "c", or "d".

[0208] "Data (message)" is represented by bars arranged from left to right, showing text (numbers, letters, etc.) as data. Figure 17 In the diagram, the bars representing the numbers 0, 1, and 2 are arranged sequentially from left to right, representing data such as "012".

[0209] The so-called "check digit" is a value calculated to check for misreading and is appended to the barcode data.

[0210] The "length of a barcode" refers to the length including the left and right quiet zones. In other words, if a barcode that also includes a quiet zone is not placed within the reading width of the barcode reader, it cannot be read.

[0211] The height of the barcode should be sufficient to ensure maximum printability. If the height is too low, the laser will deviate from the barcode, sometimes resulting in inconsistent reading. It is recommended to ensure the barcode is at least 15% of its length.

[0212] Figure 18 It is a diagram illustrating the bars and spacing in a one-dimensional barcode.

[0213] One-dimensional barcodes are composed of thin / thick bars and spacing, with the individual bars and spacing as follows: Figure 18 The name is shown.

[0214] In one embodiment of the invention, the identification code is a one-dimensional barcode, formed along the extension of the length of the bars of the one-dimensional barcode. According to this embodiment, barcode reading errors can be reduced, and the operation during scanning is good.

[0215] Figure 19 It is a diagram showing the positional relationship between the one-dimensional barcode set on the lid and the image set on the container body. For example... Figure 19 As shown, the bar of the one-dimensional barcode 2, located on the top of the cover 8, forms an image 11 on the container body 1 along the extension of the bar's length direction. That is, relative to the image 11 on the container body 1, the bar of the one-dimensional barcode 2 is arranged in a grid pattern.

[0216] like Figure 19 As shown, the receiving container is equipped with a one-dimensional barcode 2, and an image 11 of the container body 1 is formed on the extension line of the bar's length direction. In addition, the orientation of the one-dimensional barcode of the receiving container is not related to the image of the container body 1. A reading experiment was conducted using a barcode with orientation dependence.

[0217] As a result, in containers where the orientation of the one-dimensional barcode is not associated with the image of the container body, the orientation of the barcode on the cap is checked every time it is read. However, in Figure 19 By observing the image of the main container, one can determine the orientation of the barcode on the lid. Therefore, by getting used to these positional relationships, it is not necessary to check the orientation of the barcode on the lid every time, and the reading time for 100 barcodes can be reduced by about 150 seconds.

[0218] This invention provides an easy and intuitive way to read barcodes at checkout counters and other locations, and also reduces barcode reading errors.

[0219] In one embodiment of the invention, the identification code is a one-dimensional barcode, wherein the length of the bars in the long direction of the one-dimensional barcode is different at the center and ends in the short direction of the bars in the one-dimensional barcode. According to this embodiment, barcode reading errors can be reduced, and the operability during scanning is improved.

[0220] The 13-digit barcode JAN-13, commonly used in Japan, is larger than the standard size for beverage bottle caps and needs to be reduced in size when printed on the cap. The international standard for barcodes (ISO) guarantees a reduction rate of up to 80% to ensure readability; therefore, to place the barcode on a cap, it must be smaller than specified. However, to maintain barcode readability, it is best not to reduce the barcode size as much as possible. For example, as... Figure 20 As shown in Figure A, when placing a barcode on a typical plastic bottle cap, the reduction rate is approximately 50%. In this case, if low-contrast printing is used, reading errors increase. Since the cap is round, therefore, as... Figure 20As shown in B, the one-dimensional barcode on the top of the cover 8 has different lengths in the short side direction at the center and the ends. This allows the barcode to be set to the maximum size in the horizontal direction, and the bar in the central part of the barcode can be set to be long in the vertical direction. Therefore, it can be recognized as a larger size.

[0221] Reading tests were conducted on the barcode of this embodiment, which actually has a symbol contrast of 25%, and a barcode with a typical reduction ratio of 50%, and the reading success rate was increased from 30% to 80%. That is, even if the combination of the desired bottle cap color and the desired barcode color has low symbol contrast, according to the present invention, the possibility of selecting that combination is improved.

[0222] In one embodiment of the present invention, in the image, the diffuse reflectance of the image portion is greater than that of the non-image portion, and the brightness is reversed compared to the original image; in the identification code, the diffuse reflectance of the display portion of the identification code is smaller than that of the non-display portion, and the brightness is not reversed compared to the original image. According to this embodiment, barcode reading errors are reduced.

[0223] Barcodes can be positive images with dark bars and bright spaces, or negative images with reversed brightness.

[0224] When a label is drawn on a plastic bottle using laser marking, the processed area becomes a bright negative image. Almost all commercially available barcode readers can read either positive or negative images, but a very small number can only read positive images. Therefore, by making the barcode on the cap a positive image, reading errors can be reduced.

[0225] (Containment Container)

[0226] The containment of the present invention includes the receiving container of the present invention and the containment item contained in the receiving container.

[0227] As a container, it can contain, for example, liquids, gases, granular solids, etc.

[0228] Examples of liquids include water, tea, coffee, black tea, and soft drinks. When the contained item is a liquid beverage, it is usually transparent, white, black, brown, or yellow.

[0229] Examples of gases include oxygen, hydrogen, and nitrogen.

[0230] Examples of granular solids include fragments or particles of fruit meat, vegetables, coconut jelly, cassava, jelly, konjac, etc.

[0231] <Methods and apparatus for manufacturing containment devices>

[0232] The method for manufacturing the container used in this invention is a method for manufacturing the container of this invention, including an irradiation step of irradiating the container body with a laser to form an image, preferably including at least one of a rotation step and a movement step, and further including other steps as needed.

[0233] The apparatus for manufacturing the container used in this invention is an apparatus for manufacturing the container of this invention, including an irradiation means for irradiating the container body with a laser to form an image, preferably including at least one of a rotation means and a movement means, and further including other means as needed.

[0234] The laser spot diameter is preferably 1 μm or more and 200 μm or less, more preferably 10 μm or more and 100 μm or less. If the spot diameter is less than 1 μm, it is close to the wavelength of visible light. In this case, the structure processed with this laser spot diameter will not cause light scattering and will not become cloudy. On the other hand, if it is greater than 200 μm, the structure can be recognized by the human eye.

[0235] Preferably, the image is formed by controlling the intensity of the laser.

[0236] Preferably, the image is formed by laser scanning.

[0237] Ideally, imaging is formed by independently controlling the intensity of multiple lasers irradiated from multiple laser sources.

[0238] In the manufacturing method of the container used in this invention, an image is formed by irradiating a laser while rotating the container body of the object to be depicted.

[0239] Regarding the structure of the device, there are cases where the laser position is fixed and the container side moves, and cases where the container side is fixed and the laser position moves.

[0240] Alternatively, while moving the container body, it can be rotated by a certain angle, laser-etched, and then rotated by the same angle again for laser etching. This process, through synchronous control, forms an image. Sometimes, the container body is rotated at a constant speed for laser etching. The container holding part can be at the opening, the main body, or the bottom.

[0241] The container body can be placed vertically, horizontally, or tilted during processing.

[0242] When the container body passes through a conveyor belt, it can be marked from one side, or it can be marked from multiple places simultaneously when passing through a conveyor belt.

[0243] The wavelength of a laser source is suitable not only for the ultraviolet and visible light regions, but also for wavelengths from the near-infrared to the mid-infrared regions. Specifically, wavelengths above 1200 nm and below 1500 nm are also suitable.

[0244] For example, wavelengths from the near-infrared to the mid-infrared region can be processed at high speeds by turbidifying them through foaming (thermal denaturation), and arraying of the device is also easy, making it suitable from this perspective. Ultraviolet wavelengths are suitable for ablation-based processing, as they allow for increased laser light intensity.

[0245] In addition, within each band, there exists a wavelength whose absorption rate to the container body is significantly higher than that of the surrounding wavelengths, making this wavelength particularly suitable for use.

[0246] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0247] The forms involved in this embodiment are as follows:

[0248] <1> A receiving container, comprising a container body and a lid for sealing the contents within the container body, characterized in that:

[0249] An identification code is located on the top of the cover.

[0250] The container body includes multiple recesses, each having an image with an area larger than the identification code.

[0251] The difference in diffuse reflectance between the display portion and the non-display portion of the identification code is greater than the difference in diffuse reflectance between the image portion and the non-image portion.

[0252] <2> According to <1> the receiving container, the visibleity value of the container body, represented by the following formula (1), is above a predetermined value.

[0253] Recognition value = b0·L * 0·(1-exp(b1·ΔL * Equation (1)

[0254] In equation (1), L * 0 represents the brightness of the image, ΔL * b0 is the difference between the brightness of the image and the brightness of the area outside the image, where b0 is a positive real number and b1 is a negative real number.

[0255] <3> The receiving container according to <2> is characterized in that the visibility value is 2 or more.

[0256] <4> The receiving container according to <1> is characterized in that:

[0257] When the contents are contained within the container body, if the visibility value expressed by the following formula (1) is 14 or less, the symbol contrast of the identification code of the cover expressed by the following formula (2) is 30% or more.

[0258] Recognition value = b0·L * 0·(1-exp(b1·ΔL * Equation (1)

[0259] In equation (1), L * 0 represents the brightness of the image, ΔL * b0 is the difference between the brightness of the image and the brightness of the area outside the image, where b0 is a positive real number and b1 is a negative real number.

[0260] Symbol contrast

[0261] =│Diffuse reflectance of the non-display area of ​​the identification code - Diffuse reflectance of the display area of ​​the identification code│

[0262] …Formula (2).

[0263] <5> The receiving container according to any one of <1>, <2>, and <4> is characterized in that the image has a non-recessed portion.

[0264] <6> The receiving container according to any one of <1>, <2>, and <4> is characterized in that the ratio of the area of ​​the plurality of recesses to the area of ​​the image [(area of ​​the plurality of recesses / area of ​​the image) × 100] is 40% or more and 85% or less.

[0265] <7> The receiving container according to any one of <1>, <2>, and <4> is characterized in that the recess is formed by a plurality of processing parts, which are arranged in a linear shape along a first scanning direction.

[0266] <8> According to the receiving container described in <7>, the width of the recess in the second scanning direction orthogonal to the first scanning direction is less than or equal to 1 point width of a predetermined resolution.

[0267] <9> The receiving container according to any one of <1>, <2>, and <4> is characterized in that:

[0268] The identification code is a one-dimensional barcode;

[0269] The image is formed on the extension line of the long side of the bar of the one-dimensional barcode.

[0270] <10> The receiving container according to any one of <1>, <2>, and <4> is characterized in that:

[0271] The identification code is a one-dimensional barcode;

[0272] The length of the long side of the bar in the one-dimensional barcode is different in the short side direction at the center and at the ends.

[0273] <11> The receiving container according to any one of <1> to <3> is characterized in that:

[0274] The diffuse reflectance of the image portion is greater than that of the non-image portion, and the brightness is reversed compared to the original image.

[0275] In the identification code, the diffuse reflectance of the display part of the identification code is smaller than that of the non-display part, and the brightness and darkness are not reversed with the original image.

[0276] <12> A containment body, characterized in that it comprises:

[0277] The receiving container as described in any one of <1> to <11>, and

[0278] The contents contained in the container.

[0279] According to the receiving container of any one of <1> to <11> above and the housing of <12> above, various existing problems can be solved and the purpose of the present invention can be achieved.

Claims

1. A receiving container, comprising a container body and a lid for sealing an object within the container body, characterized in that: An identification code is located on the top of the cover. The container body includes multiple recesses, each having an image with an area larger than the identification code. The difference in diffuse reflectance between the display portion and the non-display portion of the identification code is greater than the difference in diffuse reflectance between the image portion and the non-image portion. The visual appeal value of the container body, as expressed by the following formula (1), is above a specified value. Recognition value = b0·L * 0·(1-exp(b1·ΔL * Equation (1) in, In the above formula (1), L * 0 represents the brightness of the image, ΔL * b0 is the difference between the brightness of the image and the brightness of the area outside the image, where b0 is a positive real number and b1 is a negative real number.

2. The receiving container according to claim 1, characterized in that, The visibility value is 2 or higher.

3. The receiving container according to claim 1, characterized in that... : When the contents are contained within the container body, if the visibility value expressed by the following formula (1) is 14 or less, the symbol contrast of the identification code of the cover expressed by the following formula (2) is 30% or more. Recognition value = b0·L * 0·(1-exp(b1·ΔL * Equation (1) In equation (1), L * 0 represents the brightness of the image, ΔL * b0 is the difference between the brightness of the image and the brightness of the area outside the image, where b0 is a positive real number and b1 is a negative real number. Symbol contrast = | Diffuse reflectance of the non-display portion of the identification code - Diffuse reflectance of the display portion of the identification code | … Equation (2).

4. The receiving container according to claim 1 or 3, characterized in that, The image has a non-concave portion.

5. The receiving container according to claim 1 or 3, characterized in that, The image has non-recessed portions between the plurality of recessed portions.

6. The receiving container according to claim 1 or 3, characterized in that, The ratio of the area of ​​the plurality of recesses to the area of ​​the image [(area of ​​the plurality of recesses / area of ​​the image) × 100] is 40% or more and 85% or less.

7. The receiving container according to claim 1 or 3, characterized in that, The recess is formed by a plurality of processing parts, which are arranged in a linear shape along a first scanning direction.

8. The receiving container according to claim 7, characterized in that, The width of the recess in the second scanning direction, which is orthogonal to the first scanning direction, is less than or equal to 1 point width of the specified resolution.

9. The receiving container according to claim 1 or 3, characterized in that... : The identification code is a one-dimensional barcode; The image is formed on the extension line of the long side of the bar of the one-dimensional barcode.

10. The receiving container according to claim 1 or 3, characterized in that... : The identification code is a one-dimensional barcode; In the short side direction of the one-dimensional barcode, the length of the long side of the bar in the central part of the one-dimensional barcode and the length of the long side of the bar in the end part of the one-dimensional barcode are different from the length of the bars in other parts of the one-dimensional barcode.

11. The receiving container according to any one of claims 1 to 3, characterized in that... : The diffuse reflectance of the image portion is greater than that of the non-image portion, and the brightness is reversed compared to the original image. In the identification code, the diffuse reflectance of the display part of the identification code is smaller than that of the non-display part, and the brightness and darkness are not reversed with the original image.

12. A containment body, characterized in that, include: The receiving container according to any one of claims 1 to 11, and The contents contained in the container.

Images