Container and container product
A container includes: a container body; a cap to seal the container body; an identification code on a top surface of the cap; and multiple concaves on the container body. The multiple concaves on the container body forms a first image having a first area, the identification code on the cap forms a second image having a second area smaller than the first area, the container body has a first diffuse reflectance difference between the first image and a portion excluding the first image, and the identification code has a second diffuse reflectance difference between a code portion and a background portion excluding the code portion in the second image. The second diffuse reflectance difference is larger than the first diffuse reflectance difference.
1. A container comprising:
a container body;
a cap configured to seal the container body;
an identification code on a top surface of the cap; and
multiple concaves on the container body,
wherein:
the multiple concaves on the container body forms a first image having a first area,
the identification code on the cap forms a second image having a second area smaller than the first area,
the container body has a first diffuse reflectance difference between the first image and a portion excluding the first image,
the identification code has a second diffuse reflectance difference between a code portion and a background portion excluding the code portion in the second image, the second diffuse reflectance difference larger than the first diffuse reflectance difference,
the first image of the container body has a visibility value equal to or larger than a predetermined value given by an expression [1] below:
visibility value= b 0 ·L* 0 ·(1−exp( b 1 ·ΔL *)), [1]
where L* 0 is a lightness value of the first image,
ΔL* is a difference between the lightness value of the first image and a lightness value of the portion of the container body excluding the first image,
b 0 is a positive real number, and
b 1 is a negative real number.
2. The container according to claim 1 , wherein;
the visibility value is two or more.
3. A container, comprising:
a container body;
a cap configured to seal the container body;
an identification code on a top surface of the cap; and
multiple concaves on the container body,
wherein:
the multiple concaves on the container body forms a first image having a first area,
the identification code on the cap forms a second image having a second area smaller than the first area,
the container body has a first diffuse reflectance difference between the first image and a portion excluding the first image,
the identification code has a second diffuse reflectance difference between a code portion and a background portion excluding the code portion in the second image, the second diffuse reflectance difference larger than the first diffuse reflectance difference,
wherein:
a visibility value of the first image of the container body containing a content given by an expression [1] below is 14 or less, and
a symbol contrast of the identification code on the cap given by an expression [2] below is 30% or more,
visibility value= b 0 ·L* 0 ·(1−exp( b 1 ·ΔL *)), [1]
where L* 0 is a lightness value of the first image,
ΔL* is a difference between the lightness value of the first image and a lightness value of a portion of the container body excluding the first image,
b 0 is a positive real number, and
b 1 is a negative real number, and
symbol contrast=|(diffuse reflectance of the background portion)−(diffuse reflectance of the code portion)|. [2]
4. The container according to claim 1 ,
wherein the first image includes a non-concave portion between the multiple concaves.
5. The container according to claim 1 ,
wherein the first image includes a non-concave portion between each of the multiple concaves.
6. The container according to claim 1 ,
wherein a ratio of a concave area of the multiple concaves to an area of the first image given by an expression [3] below is 40% or more and 85% or less,
a ratio=(an area of the multiple concaves)/(an area of the first image)×100. [3]
7. The container according to claim 1 ,
wherein the multiple concaves are continuously arranged without a space in a line along a first scanning direction.
8. The container according to claim 4 ,
wherein a sum of a width of one concave among the multiple concaves and a width of the non-concave portion between the multiple concaves is equal to or smaller than a width of a one dot in the first image in a predetermined resolution in a second scanning direction orthogonal to a first scanning direction.
9. The container according to claim 1 , wherein:
the identification code is a one-dimensional barcode, and
the first image is formed in a portion of the container body on an extension line of a bar in the one-dimensional barcode in a longitudinal direction of the bar.
10. The container according to claim 1 , wherein;
the identification code is a one-dimensional barcode,
the one-dimensional barcode includes multiple bars extending in an extension direction orthogonal to a longitudinal direction of the one-dimensional barcode, and
a length of a central bar in the multiple bars at a central portion of the one-dimensional barcode is longer than a length of an end bar in the multiple bars at an end portion of the one-dimensional barcode in the extension direction.
11. The container according to claim 1 , wherein;
a diffuse reflectance of the first image is larger than a diffuse reflectance of the portion excluding the first image, and
a diffuse reflectance of the code portion of the identification code is smaller than a diffuse reflectance of background portion of the identification code.
12. A container product comprising:
the container according to claim 1 ; and
a content in the container.
13. The container according to claim 3 , wherein:
the visibility value is two or more.
14. The container according to claim 3 ,
wherein the first image includes a non-concave portion between the multiple concaves.
15. The container according to claim 3 ,
wherein the first image includes a non-concave portion between each of the multiple concaves.
16. The container according to claim 3 ,
wherein a ratio of a concave area of the multiple concaves to an area of the first image given by an expression [3] below is 40% or more and 85% or less,
a ratio=(an area of the multiple concaves)/(an area of the first image)×100. [3]
17. The container according to claim 3 ,
wherein the multiple concaves are continuously arranged without a space in a line along a first scanning direction.
18. The container according to claim 14 ,
wherein a sum of a width of one concave among the multiple concaves and a width of the non-concave portion between the multiple concaves is equal to or smaller than a width of a one dot in the first image in a predetermined resolution in a second scanning direction orthogonal to a first scanning direction.
19. The container according to claim 3 , wherein:
the identification code is a one-dimensional barcode, and
the first image is formed in a portion of the container body on an extension line of a bar in the one-dimensional barcode in a longitudinal direction of the bar.
20. The container according to claim 1 , wherein:
the identification code is a one-dimensional barcode,
the one-dimensional barcode includes multiple bars extending in an extension direction orthogonal to a longitudinal direction of the one-dimensional barcode, and
a length of a central bar in the multiple bars at a central portion of the one-dimensional barcode is longer than a length of an end bar in the multiple bars at an end portion of the one-dimensional barcode in the extension direction.