While I am downloading csv file in my laravel project, the file name which is in japanese is printed like ___.csv.
This is the file download part

 $currentDate = Carbon::now()->format('Ymd');
        $fileName = '【' . $selectedCategory->title . '】' . $headquarterName->title . '_' . $currentDate . '_虎の巻利用状況.csv';
        $filePath = storage_path('app/'.$fileName);
        // csv download
        $csvFile = fopen(storage_path('app/' . $fileName), 'w');
        $bom = chr(239) . chr(187) . chr(191);
        fwrite($csvFile, $bom);
        header('Content-Type: text/csv; charset=UTF-8');
        fputcsv($csvFile, $this->getHeaderRow($contents));
        foreach ($contents as $data) {
            $dataRow = $this->getDataRow($data);
            $this->customFputcsv($csvFile, $dataRow);
        }
        fclose($csvFile);
        return Response::download($filePath, $fileName);

This is file name is storage
file stored in storage

And this is the file which is downloaded in my device:

file downloaded in my device

Here we can see that japanese charecters are printed like ____

I need solution from here.