Patent ID: 7605101

Claim:
A laminate comprising: a first green sheet which includes a first glass comprising: 10 to 30 percent by mass of Si in terms of SiO 2 ; a total of 5 to 30 percent by mass of at least one of Mg and Zn in terms of MgO and ZnO, respectively; wherein the total amount of MgO and ZnO is 5 to 30 percent by mass; 10 to 30 percent by mass of B in terms of B 2 O 3 ; and Al and M which is at least one of Sr and Ba, a relationship between Al content and M content being so defined that a position represented by percent by mass of Al in terms of Al 2 O 3 and percent by mass of M in terms of MO on a coordinate system are on or in a range defined by straight lines connecting point A (Al=1, M=21), point B (Al=1, M=35), point C (Al=9, M=45), point D (Al=20, M=45), point E (Al=20, M=35), and point F (Al=9, M=21) on the coordinate system; and a second green sheet which includes a second glass comprising: Si whose percent by mass in terms of SiO 2 is larger than the percent by mass of Si in terms of SiO 2 of the first glass by 1 to 40 percent by mass; and B whose content in terms of B 2 O 3 is 3 percent by mass or more and at least 5 percent by mass less than the B content in terms of B 2 O 3 of the first glass, the first green sheet being integrally laminated with the second green sheet, wherein the second glass contains 20 to 60 percent by mass of Si in terms of SiO 2 , 10 to 25 percent by mass of Al in terms of Al 2 O 3 , 8 to 35 percent by mass of Mg in terms of MgO, and 10 to 20 percent by mass of M in terms of MO, and wherein a ratio MgO/SiO 2 of MgO to SiO 2 is in a range of 0.20 to 0.87.