# US 12,759,282 B2 · Multi-optical-color optically-variable printing device and printing method thereof, and readable storage medium

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- Number: US 12,759,282 B2
- Document ID: US12759282B2
- Status: Granted
- Kind: B2
- Application number: 18/857,105
- Filed: 2023-04-21
- Published: 2025-08-21
- Granted: 2026-10-13
- Earliest claimed: 2022-04-22
- Assignees: China Banknote Printing and Minting Corp.; China Banknote Security Printing Technology Research Institute Co., Ltd.
- Applicants: China Banknote Printing and Minting Corporation; China Banknote Security Printing Technology Research Institute Co., Ltd.
- Inventors: Jian Ma; Fangjian Li; Lisha Guo; Pinli Pan; Xudong Chen; Zhihong Yang
- Web page: https://patentgrep.com/patent/US12759282B2

## CPC

- B41F 15/38: curved
- B05D 3/067: {Curing or cross-linking the coating}
- B41F 11/02: for securities (security printing B41M3/14)
- B41F 15/12: with auxiliary equipment, e.g. for drying printed articles
- B41F 23/0453: {by ultraviolet dryers}
- B41F 33/0009: {Central control units}
- B41M 1/12: Stencil printing; Silk-screen printing
- B41M 1/22: Metallic printing; Printing with powdered inks
- B41M 7/00: After-treatment of prints, e.g. heating, irradiating, {setting of the ink, protection of the printed stock (pre-treatment or treatment during printing B41M5/0011; printers for treating or overcoating copy materials before, during or after printing B41J11/0015)}
- B41F: PRINTING MACHINES OR PRESSES (manifolding devices or office printing machines B41L)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

A multi-optical-color optically-variable printing device having: a conveying unit; a screen printing unit, configured to printing an ink or a varnish containing a magnetic substance on a printing stock; and a plurality of optical-color optically-variable pattern forming units. Each optical-color optically-variable pattern forming unit comprises: magnetizing rollers, magnetic orientation components being arranged on each magnetizing roller and configured to performing magnetic orientation on the printing stock; and pre-drying and curing devices, configured to pre-drying and curing the printing stock, each pre-drying and curing device comprising optical mask curing devices, the optical mask curing device being fixedly arranged and configured to projecting dynamically refreshable variable optical field image-text, and the variable optical field image-text and the printing stock synchronously moving a predetermined distance.

## Claims

### Claim 1

A multi-optical-color optically-variable printing device, comprising:
a conveying unit for conveying a printing stock;
a screen printing unit for printing ink or varnish containing a magnetic substance on the printing stock; and
a plurality of optical-color optically-variable pattern forming units, wherein the plurality of optical-color optically-variable pattern forming units are respectively configured to form optical-color optically-variable patterns on different regions of the printing stock; each optical-color optically-variable pattern forming unit comprises:
magnetizing rollers, wherein magnetic orientation components are arranged on each magnetizing roller and configured to perform magnetic orientation on the printing stock; and
pre-drying and curing devices for pre-drying and curing the printing stock;
wherein the conveying unit, the screen printing unit and the plurality of optical-color optically-variable pattern forming units are arranged successively in the conveying direction of the printing stock;
wherein the magnetic orientation components of at least two optical-color optically-variable pattern forming units have different magnetization effects from each other, the pre-drying and curing devices are arranged opposite to each other at the outer sides of the magnetic orientation components, and in the process that the magnetic orientation components conduct magnetic orientation to the printing stock, the pre-drying and curing device conducts pre-drying and curing to the printing stock at the same time;
wherein the pre-drying and curing device comprises an optical mask curing device, the optical mask curing device is fixedly arranged and configured to project a dynamically refreshable variable optical field image-text, and the variable optical field image-text and the printing stock synchronously move a predetermined distance;
wherein the multi-optical-color optically-variable printing device comprises a sensor, and the sensor is configured to collect the position information and speed information of the printing stock; and
wherein the multi-optical-color optically-variable printing device further comprises:
a first rearrangement magnetization device, wherein the first rearrangement magnetization device is provided between the screen printing unit and the optical-color optically-variable pattern forming unit; and
a second rearrangement magnetization device, wherein the second rearrangement magnetization device is provided between multiple optical-color optically-variable pattern forming units,
wherein when ink or varnish is printed on the printing stock, the magnetic pigment sheets therein are arranged in a disorderly and irregular manner, and when the printing stock is conveyed to the first rearrangement magnetization device and the second rearrangement magnetization device, magnetic pigment sheets in the ink or varnish containing a magnetic substance are rearranged parallel to the printing stock;
wherein the pre-drying and curing device further comprises:
a curing device adjustment mechanism, wherein the curing device adjustment mechanism comprises a fixing beam, a motor and a guide rail, and the fixing beam extends along the axial direction of the magnetizing roller, the optical mask curing device is provided on the fixing beam, and the motor drives the optical mask curing device to move along the fixing beam;
the fixing beam comprises a horizontal plate and a vertical plate, the horizontal plate and the vertical plate are connected to each other, and the motor is provided on the horizontal plate; the guide rail comprises a linear guide rail and a curing device guide rail, the linear guide rail is located on the horizontal plate, and the curing device guide rail is located on the vertical plate; multiple optical mask curing devices are respectively connected to the linear guide rail, and they can move on the fixing beam;
the optical mask curing device comprises:
a light source for emitting light;
a controller for receiving the position information and the speed information of the sensor and further for receiving, storing and processing image-text data for projection, and generating a control signal based on the position information, the speed information and the image-text data for projection;
a lens; and
a spatial light modulator for receiving the light emitted by the light source and the control signal to project the variable optical field image-text through the lens.

### Claim 2 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein,
the spatial light modulator comprises one of a digital micro mirror DMD, a liquid crystal spatial light modulator and an acousto-optical modulator.

### Claim 3 (depends on 2)

The multi-optical-color optically-variable printing device according to claim 2, wherein,
the optical mask curing device further comprises a heat dissipation assembly and the heat dissipation assembly is configured to dissipate heat for the spatial light modulator and/or the light source.

### Claim 4 (depends on 3)

The multi-optical-color optically-variable printing device according to claim 3, wherein,
the light source comprises a UV-LED light source or a laser light source, and the wavelength of the light emitted by the light source is 350 nm~425 nm.

### Claim 5 (depends on 4)

The multi-optical-color optically-variable printing device according to claim 4, wherein,
the variable optical field image-text comprises one of an image, a character, a serial number, a barcode, and a QR code.

### Claim 6 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein,
the pre-drying and curing device comprises multiple optical mask curing devices, and the multiple optical mask curing devices are arranged at intervals in the axial direction of the magnetizing roller.

### Claim 7 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein, the multi-optical-color optically-variable printing device further comprises:
a delivery system, and the delivery system comprises multiple conveying rollers, and the delivery system is configured to convey the printing stock.

### Claim 8 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein,
the ink or the varnish comprises an optical-color optically-variable ink, a curing gloss oil, or other types of UV curing ink.

### Claim 9 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein,
the printing stock comprises one of paper, a plastic sheet, and a metal sheet.

### Claim 10 (depends on 1)

The multi-optical-color optically-variable printing device according to claim 1, wherein, the multi-optical-color optically-variable printing device further comprises a drying and curing unit, and the drying and curing unit is provided on the lower reach of the plurality of optical-color optically-variable pattern forming units, and configured to dry and cure the printing stock.

### Claim 11 (depends on 2)

The multi-optical-color optically-variable printing device according to claim 2, wherein, the spatial light modulator further comprises a GLV modulator.

### Claim 12 (depends on 2)

The multi-optical-color optically-variable printing device according to claim 2, wherein,
the pre-drying and curing device comprises multiple optical mask curing devices, and the multiple optical mask curing devices are arranged at intervals in the axial direction of the magnetizing roller.