Laser transfer printing device and method

Patent metadata

Field	Value
Publication number	US-12064952-B2
Application number	US-201817043926-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	May 31, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A laser transfer printing device and a laser transfer printing method are provided. The laser transfer printing device includes a laser, a beam expander, a beam splitter and a focusing module. The laser is configured to generate a laser beam. The beam expander is disposed on an optical path of the laser beam generated by the laser to expand the laser beam generated by the laser. The beam splitter is disposed on an optical path of the laser beam expanded by the beam expander to reflect the expanded laser beam to the focusing module. The focusing module is disposed on an optical path of the laser beam reflected by the beam splitter to focus the laser beam and project the focused laser beam to a predetermined transfer processing position.

First claim

What is claimed is:

1. A laser transfer printing device, comprising:
a laser configured to generate a laser beam;
a beam expander disposed on an optical path of the laser beam generated by the laser to expand the laser beam generated by the laser, the laser beam being expanded by increasing a diameter of the laser beam;
a beam splitter disposed on an optical path of the laser beam expanded by the beam expander to reflect the expanded laser beam to a focusing module; and
the focusing module disposed on an optical path of the laser beam reflected by the beam splitter to focus the laser beam and project the focused laser beam to a predetermined transfer processing position to form a transfer printing space, the transfer printing space having a boundary with a light intensity attenuated to 1/e of that of a center of the space.

2. The laser transfer printing device according to claim 1 , further comprising:
an imaging module configured to receive the laser beam reflected at the predetermined transfer processing position to obtain an image of the predetermined transfer processing position; and
a display module configured to receive and display the image of the predetermined transfer processing position.

3. The laser transfer printing device according to claim 2 , wherein the image displayed by the display module is an enlarged image of the predetermined transfer processing position.

4. The laser transfer printing device according to claim 1 , further comprising:
a light source pinhole disposed on an optical path between the laser and the beam expander to eliminate a scattering of the laser beam itself.

5. The laser transfer printing device according to claim 1 , further comprising an imaging pinhole disposed between the beam splitter and the imaging module to filter an interference laser beam reflected at the predetermined transfer processing position.

6. The laser transfer printing device according to claim 1 , wherein the laser is a continuous laser.

7. The laser transfer printing device according to claim 1 , wherein:
the focusing module is a bright field focusing unit comprising a focusing lens and an optical lens;
the focusing lens has an incident end and an exit end; and
an expanded cylindrical laser beam enters the focusing lens at the incident end, and the optical lens is configured to focus the laser beam and project the focused laser beam to the predetermined transfer processing position.

8. The laser transfer printing device according to claim 7 , wherein the bright field focusing unit is configured to focus the laser beam, and projects the focused laser beam to the predetermined transfer processing position to form the transfer printing space.

9. The laser transfer printing device according to claim 8 , wherein the transfer printing space of the bright field focusing unit has an elliptical sphere shape.

10. The laser transfer printing device according to claim 1 , wherein the focusing module is a dark field focusing unit comprising a focusing lens, an optical mirror and an optical lens;
the focusing lens has an incident end and an exit end;
the optical mirror is an annular optical mirror, and the optical lens is disposed in a hole of the annular optical mirror; and
an expanded tubular laser beam enters the focusing lens at the incident end, and is reflected for a first time on the optical mirror, the first reflected laser beam is reflected for a second time on a side wall of the focusing lens, and the second reflected laser beam is focused, the focused laser beam is projected to the predetermined transfer processing position.

11. The laser transfer printing device according to claim 10 , wherein:
the dark field focusing unit is configured to focus the laser beam, and project the focused laser beam to the predetermined transfer processing position to form the transfer printing space; and
the transfer printing space is a cubic space with uniform light intensity.

12. The laser transfer printing device according to claim 7 , wherein a focus distance of the optical lens is in a range of 2 mm to 10 mm.

13. The laser transfer printing device according to claim 7 , wherein the optical lens is an optical lens group.

14. The laser transfer printing device according to claim 10 , wherein a focus distance of the optical lens is in a range of 2 mm to 10 mm.

15. The laser transfer printing device according to claim 10 , wherein the optical lens is an optical lens group.

16. A laser transfer printing method for a laser transfer printing device, comprising:
generating a laser beam by a laser;
expanding by a beam expander the laser beam generated by the laser, the laser beam being expanded by increasing a diameter of the laser beam;
reflecting by a beam splitter the laser beam expanded by the beam expander to a focusing module; and
focusing the laser beam by the focusing module and projecting the focused laser beam to a predetermined transfer processing position by the focusing module to form a transfer printing space, wherein the transfer printing space having a boundary with a light intensity attenuated to 1/e of that of a center of the space.

17. The laser transfer printing method according to claim 16 , wherein when the focusing module is a bright field focusing unit, and a device disposed on a shape memory polymer substrate is transferred to a flexible substrate based on the transfer printing space.

18. The laser transfer printing method according to claim 16 , wherein the laser transfer printing device further comprises:
an imaging module configured to receive the laser beam reflected at the predetermined transfer processing position to obtain an image of the predetermined transfer processing position; and
a display module configured to receive and display the image of the predetermined transfer processing position.

19. The laser transfer printing method according to claim 16 , wherein the focusing module is a bright field focusing unit comprising a focusing lens and an optical lens;
the focusing lens has an incident end and an exit end; and
an expanded cylindrical laser beam enters the focusing lens at the incident end, and the optical lens is configured to focus the laser beam and project the focused laser beam to the predetermined transfer processing position.

20. The laser transfer printing method according to claim 16 , wherein the focusing module is a dark field focusing unit comprising a focusing lens, an optical mirror and an optical lens;
the focusing lens has an incident end and an exit end;
the optical mirror is an annular optical mirror, and the optical lens is disposed in a hole of the annular optical mirror; and
an expanded tubular laser beam enters the focusing lens at the incident end, and is reflected for a first time on the optical mirror, the first reflected laser beam is reflected for a second time on a side wall of the focusing lens, and the second reflected laser beam is focused, the focused laser beam is projected to the predetermined transfer processing position.

Assignees

• Inst Flexible Electronics Tech Thu Zhejiang
• Univ Tsinghua

Inventors

• Feng Xue
• Zhang Baicheng
• Chen Ying
• Fu Haoran
• Jiang Ye
• Liu Lanlan

Classifications

• G02B27/09 Primary

  Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for {(adapting the beam shape of a laser diode G02B19/0052; adapting the beam shape of an LED G02B19/0061; coupling into light guides using intermediate optical elements G02B6/4204; beam shaping specially adapted for lasers H01S3/005)} · CPC title

• H05K3/30

  Assembling printed circuits with electric components, e.g. with resistors · CPC title

• G02B27/0983 Primary

  being curved · CPC title

• G02B27/0988

  Diaphragms, spatial filters, masks for removing or filtering a part of the beam · CPC title

• G02B27/0955

  Lenses (lenses per se G02B3/00) · CPC title