EP0083062B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for inspecting printed matters
Assignee: Toshiba Corp
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Filing: 1982-12-21
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Granted: 1987-09-09
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Expires: 2002-12-21
Abstract
Abstract A printed matter (4), in which an ink capable of reflecting electromagnetic waves of wavelengths outside the visible range is used, is irradiated by electromagnetic radiation from a lamp (8) at least containing said wavelengths outside the visible range. Light reflected from the irradiated printed matter (4) is coupled to a photoelectric converter (12), the output of which is taken out through an amplifier (13). The printed matter (4) is inspected in terms of whether the level of the amplified output is high or low for a invisible wavelength range.
Inventors
- 👤 Tsuyoshi Ishida
- 👤 Akira Toshima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:53
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/121; G07D7/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
262 words
An apparatus for inspecting printed matter comprising means for irradiating at least a section of the printed matter with electromagnetic radiation of a predetermined wavelength range, means for forming a plurality of electric signals representing the spectral energy distribution of the electromagnetic radiation reflected from the inspected printed matter, and inspecting means including a first memory (170) for storing said plurality of electric signals and judging means for determining whether the inspected printed matter is an authentic one on the basis of the electric signals in said first memory (170), characterized in that - said means for forming said plurality of electric signals includes a like plurality of photoelectric converters (151-158), and -said inspecting means further includes a second memory (173) in which a like plurality of reference data is stored, said plurality of reference data representing the spectral distribution of the reflectivity of authentic printed matter and having a reflectivity peak in a wavelength region in the visible range, higher reflectivities than said reflectivity peak in a wavelength region in the invisible range and lower reflectivities than said reflectivity peak in a wavelength region between said two other wavelength regions, means (171) for successively reading out corresponding pairs of output signals and reference data from said respective first and second memories and for transmitting successively these pairs to means (172) for obtaining the difference between an output signal and corresponding reference data, means (174) for accumulating the output of said difference obtaining means (172) over the whole plurality of pairs, the judging means receiving the output of said accumulating means (174).
References Cited (Backward Citations)
No citation records indexed.
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