# US 11,110,729 B2 · Recording medium and method for acquiring landing deviation amount in recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,110,729 B2 - Document ID: US11110729B2 - Status: Granted - Kind: B2 - Application number: 16/564,005 - Filed: 2019-09-09 - Published: 2020-03-12 - Granted: 2021-09-07 - Earliest claimed: 2018-09-10 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Masashi Yasui - Web page: https://patentgrep.com/patent/US11110729B2 ## CPC - B41J 2/125: Sensors, e.g. deflection sensors {(nozzle clogging detection for cleaning reasons B41J2/16579; detection for compensation for failed nozzles B41J2/2139)} - B41J 29/393: Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns} - B41J 2/2114: {Ejecting specialized liquids, e.g. transparent or processing liquids (B41J2/211 takes precedence)} - B41J 2/2117: {Ejecting white liquids} - B41J 2/2142: {Detection of malfunctioning nozzles (generating single droplets or particles on demand by pressure, e.g. electromechanical transducers B41J2/045, B41J2/05; jet deflection sensors B41J2/125; for cleaning purposes B41J2/16579)} - B41J 2/2146: {for line print heads} - B41J 2025/008: {comprising a plurality of print heads placed around a drum} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract Provided is a recording medium having a test pattern recorded thereon, the test pattern being used for acquiring a landing deviation amount of a recording apparatus including a discharge unit configured to discharge a transparent ink, wherein when light is radiated to be incident on a surface of the recording medium at an incident angle of 45 degrees, and lightness of reflected light from the test pattern recorded with the transparent ink and lightness of reflected light from the recording medium are measured, with each of the lightness being measured at a position perpendicular to the surface, a difference in lightness between the reflected light from the test pattern and the reflected light from the recording medium is equal to or greater than a value predetermined, based on a type of the recording medium. ## Claims ### Claim 1 A recording medium having a test pattern recorded, the test pattern being used for acquiring a landing deviation amount of a recording apparatus including a discharge unit configured to discharge a transparent ink, the recording medium comprising: a first area in which the test pattern is recorded with at least the transparent ink; and a second area in which the test pattern is not recorded and that is different from the first area, the recording medium having a lightness difference between the first area and the second area, the lightness difference being equal to or greater than a value predetermined based on a type of the recording medium, the light difference being defined as a difference in lightness between a reflected light from the test pattern recorded with the transparent ink in the first area and a reflected light from the recording medium in the second area when light is radiated to be incident on a surface of the recording medium at an incident angle of 45 degrees, and lightness of the reflected light from the test pattern recorded with the transparent ink in the first area and lightness of the reflected light from the recording medium in the second area are measured, with each of the lightness being measured at a position perpendicular to the surface, wherein the recording medium has the lightness difference equal to or greater than 0.007 as the predetermined value, when L1 is the lightness of the reflected light from the test pattern recorded with the transparent ink in the first area and L2 is the lightness of the reflected light from the recording medium in the second area, and the difference in lightness is an absolute value of a difference between a logarithmic function LogL1 and a logarithmic function LogL2. ### Claim 2 (depends on 1) The recording medium according to claim 1, wherein the recording medium has the lightness difference defined as the difference in the lightness defined in a Lab color space between the reflected light from the test pattern recorded with the transparent ink in the first area and the reflected light from the recording medium in the second area. ### Claim 3 (depends on 1) The recording medium according to claim 1, wherein the recording medium is a foil paper, a kneaded vapor-deposited film, or a sand-matted vapor-deposited film. ### Claim 4 The recording medium having a test pattern recorded, the test pattern being used for acquiring a landing deviation amount of a recording apparatus including a discharge unit configured to discharge a transparent ink, the recording medium comprising: a first area in which the test pattern is recorded with at least the transparent ink; and a second area in which the test pattern is not recorded and that is different from the first area, the recording medium having a lightness difference between the first area and the second area, the lightness difference being equal to or greater than a value predetermined based on a type of the recording medium, the light difference being defined as a difference in lightness between a reflected light from the test pattern recorded with the transparent ink in the first area and a reflected light from the recording medium in the second area when light is radiated to be incident on a surface of the recording medium at an incident angle of 45 degrees, and lightness of the reflected light from the test pattern recorded with the transparent ink in the first area and lightness of the reflected light from the recording medium in the second area are measured, with each of the lightness being measured at a position perpendicular to the surface, wherein the test pattern includes a plurality of ruled lines recorded with the transparent ink, and a plurality of rules line pairs, each ruled line has a lateral width substantially equal to a gap distance between each ruled line pair, and the plurality of ruled lines are positioned corresponding to at least one of the plurality of ruled line pairs such that each ruled line has a stepwisely different spacing to a corresponding ruled line pair.