content_image/880993.jpg content_image/881015.jpg content_image/880992.jpg content_image/881002.jpg
(19) 

<img src='content_image/880993.jpg'>

(12) EUROPEAN PATENT APPLICATION 

(43) Date of publication: 07.04.2021 Bulletin 2021/14 

(21) Application number: 20197577.8 

(22) Date of filing: 22.09.2020 

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN 

(30) Priority: 24.09.2019 JP 2019173559 

(71) Applicant: Phoenix Electric Co., Ltd. Himeji-shi, Hyogo 679-2122 (JP) 

(51) Int Cl.: 

<img src='content_image/881015.jpg'>

(72) Inventors: 

• GOUDA, Tetsuya Himeji-shi,, Hyogo 6792122 (JP) 

• WATANABE, Kana Himeji-shi,, Hyogo 6792122 (JP) 

• KINOSHITA, Masaaki Himeji-shi,, Hyogo 6792122 (JP) 

(74) Representative: Horn Kleimann Waitzhofer Patentanwälte PartG mbB Ganghoferstrasse 29a 80339 München (DE) 

<img src='content_image/880992.jpg'>

# (11) EP 3 800 000 A1 

(54) LASER IRRADIATION DEVICE AND SURFACE ROUGHENING METHOD USING SAME 

(57) Itisintended to provide a laserirradiationdevice, whereby it is made possible to irradiate a laser beam optimal to perform roughening treatment for the surface of a member in order to enhance adhesiveness on the surface of the member, and simultaneously, a laser di- ode,evenwhen used as a lightsource ofthe laserbeam, canbe mitigated indamage.The presentlaserirradiation device (10)irradiates a laserbeam (L)atintervalsofpre- determined time. At one time of irradiation, the laser 

beam (L) has a waveform composed of a former portion (100) and a latter portion (104). In the former portion (100), an increase rate of irradiation intensity per unit time ismaximized on an outsetofirradiation and is grad- ually reduced as the irradiation intensity approaches a maximum. In the latter portion (104), a reduction rate of irradiation intensity per unit time is maximized after the former portion (100) and is gradually reduced as the ir- radiation intensity approaches a baseline current. 

<img src='content_image/881002.jpg'>

