Container and content containing body, and method for producing container and container producing apparatus
Provided is a container including a container body and an image on the container body. The image includes a plurality of dented portions and non-dented portions. A visibility value of the image represented by Mathematical formula (1) below is greater than or equal to a predetermined value. Visibility value= b 0 ·L* 0 ·(1−exp( b 1 ·ΔL *)) Mathematical formula (1) In Mathematical formula (1), L* 0 represents a luminosity of the image. ΔL* represents a difference between the luminosity of the image and a luminosity of any other portion than the image, b 0 represents a positive real number, and b 1 represents a negative real number.
1 . A container, comprising:
a container body having an image on the container body; and
a content contained in the container, wherein
the image includes a plurality of dented portions and non-dented portions, and
a visibility value of the image represented by Mathematical formula (1) below is 2 or greater,
Visibility value= b 0 ·L* 0 ·(1−exp( b 1 ·ΔL *)) Mathematical formula (1)
where L* 0 represents a luminosity of the image determined by:
a G signal of a photo of the container body taken in a darkroom in a state where a pair of white diffusion surfaces are respectively set on both sides of the container body, and
a polynomial representing a relationship between G signals and luminosity obtained by taking a photo of a color chart having known luminosity values and approximating output values of the photo of the color chart with an n-th order polynomial, and
ΔL* represents a difference between the luminosity of the image, determined by the G signal of the photo of the container body and the polynomial, and a luminosity of any portion of the container body other than the image,
b 0 is 0.195, and
b 1 is −0.193.
2 . The container according to claim 1 , wherein a ratio of an area of the plurality of dented portions to an area of the image [(the area of the plurality of dented portions/the area of the image)×100] is 40% or greater but 95% or less.
3 . The container according to claim 1 , wherein
each of the dented portions is formed of a plurality of processed portions, and
the plurality of processed portions are disposed linearly along a first scanning direction.
4 . The container according to claim 3 , wherein a width of each of the dented portions in a second scanning direction orthogonal to the first scanning direction is less than or equal to a one-dot width of a predetermined resolution.
5 . A method for producing the container according to claim 1 , the method comprising irradiating the container body with laser light to form the image.
6 . The method for producing the container according to claim 5 , further comprising either or both of rotating the container body about an axis and moving the container body.
7 . The method for producing the container according to claim 5 , wherein a spot diameter of the laser light is 1 micrometer or greater but 200 micrometers or less.
8 . The method for producing the container according to claim 5 , wherein the image is formed under control of an intensity of the laser light.
9 . The method for producing the container according to claim 5 , wherein the image is formed under scanning of the laser light.
10 . The method for producing the container according to claim 5 , wherein the image is formed under independent control of intensities of a plurality of rays of laser light emitted from a plurality of laser light sources.
11 . An apparatus configured to produce the container according to claim 1 , the apparatus comprising an irradiation unit configured to irradiate the container body with laser light to form the image.
12 . The apparatus configured to produce the container according to claim 11 , further comprising either or both of a rotating unit configured to rotate the container body about an axis and a moving unit configured to move the container body.
13 . A container, comprising:
a container body having an image on the container body; and
a content contained in the container, wherein
the image includes a plurality of dented portions, and
a visibility value of the image represented by Mathematical formula (1) below is 2 or greater,
Visibility value= b 0 ·L* 0 ·(1−exp( b 1 ·ΔL *)) Mathematical formula (1)
where L* 0 represents a luminosity of the image determined by:
a G signal of a photo of the container body taken in a darkroom in a state where a pair of white diffusion surfaces are respectively set on both sides of the container body, and
a polynomial representing a relationship between G signals and luminosity obtained by taking a photo of a color chart having known luminosity values and approximating output values of the photo of the color chart with an n-th order polynomial, and
ΔL* represents a difference between the luminosity of the image, determined by the G signal of the photo of the container body and the polynomial, and a luminosity of any portion of the container body other than the image,
b 0 is 0.195, and
b 1 is −0.193.