Wiring board and semiconductor package
A wiring board includes a stacked body having a plurality of insulating layers and a plurality of wiring layers which are alternately stacked, and a solder-resist layer being formed on one side of the stacked body and covering the wiring layer exposed to the one side of the stacked body. The insulating layer is exposed to the other side of the stacked body. The solder-resist layer is in a transparent or semitransparent light yellow color.
1. A wiring board comprising:
a stacked body having a plurality of insulating layers and a plurality of wiring layers which are alternately stacked; and
a solder-resist layer being formed on one side of the stacked body and covering the wiring layer exposed to the one side of the stacked body;
wherein the insulating layer is exposed to the other side of the stacked body, and
the solder-resist layer is in a transparent or semitransparent light yellow color.
2. The wiring board as defined in claim 1 , wherein the wiring layer exposed to one side of the stacked body is visually recognizable through the solder-resist layer.
3. The wiring board as defined in claim 1 , wherein a pantone value of the solder-resist layer corresponds to any of DS1-4C-1-9C, DS2-5C-2-9C, DS3-6C-3-8C, DS5-6C-5-9C, DS6-6C-6-9C, DS7-6C-7-8C, DS9-5C-9-8C, DS294-6C-294-9C, DS295-6C-295-9C, DS298-6C-298-9C, DS299-6C-299-9C, DS302-7C-302-9C, DS303-7C-303-9C, DS309-6C-309-9C, and DS310-6C-310-9C.
4. The wiring board as defined in claim 1 , wherein a transmission factor of the solder-resist layer for light having a wavelength of 360 nm is 0%-20%, a transmission factor for light having a wavelength of 460 nm is 10%-40%, a transmission factor for light having a wavelength of 560 nm is 30%-60%, a transmission factor for light having a wavelength of 660 nm is 45%-70%, a transmission factor for light having a wavelength of 760 nm is 50%-75%, and a transmission factor for light having a wavelength of 860 nm is 60%-80%.
5. The wiring board as defined in claim 3 , wherein a transmission factor of the solder-resist layer for light having a wavelength of 360 nm is 0%-20%, a transmission factor for light having a wavelength of 460 nm is 10%-40%, a transmission factor for light having a wavelength of 560 nm is 30%-60%, a transmission factor for light having a wavelength of 660 nm is 45%-70%, a transmission factor for light having a wavelength of 760 nm is 50%-75%, and a transmission factor for light having a wavelength of 860 nm is 60%-80%.
6. The wiring board as defined in claim 1 , wherein a thickness of the solder-resist layer is 5 μm-50 μm.
7. The wiring board as defined in claim 1 , wherein the solder-resist layer contains a light yellow type pigment.
8. The wiring board as defined in claim 1 , wherein:
the wiring layer exposed to one side of the stacked body includes at least one identification mark, and
the identification mark is visually recognizable through the solder-resist layer.
9. The wiring board as defined in claim 1 , wherein:
another wiring layer is exposed from the insulating layer exposed to the other side of the stacked body, and the other wiring layer functions as a first electrode pad; and
the solder resist layer includes an opening which exposes part of the wiring layer exposed to one side of the stacked body, and the wiring layer exposed into the opening functions as a second electrode pad.
10. The wiring board as defined in claim 9 , wherein:
either of the first and second electrode pads is an electrode pad for electrical connection with a semiconductor chip; and
the other of them is an electrode pad for electrical connection with another board.
11. The wiring board as defined in claim 1 , wherein:
the stacked body does not include any member serving as a core;
the individual wiring layers are connected to one another by wiring lines penetrating through the insulating layers; and
a diameter of each of the wiring lines on one side of the stacked body is larger than a diameter on the other side of the stacked body.
12. The wiring board as defined in claim 3 , wherein:
the stacked body does not include any member serving as a core;
the individual wiring layers are connected to one another by wiring lines penetrating through the insulating layers; and
a diameter of each of the wiring lines on one side of the stacked body is larger than a diameter on the other side of the stacked body.
13. The wiring board as defined in claim 4 , wherein:
the stacked body does not include any member serving as a core;
the individual wiring layers are connected to one another by wiring lines penetrating through the insulating layers; and
a diameter of each of the wiring lines on one side of the stacked body is larger than a diameter on the other side of the stacked body.
14. The wiring board as defined in claim 5 , wherein:
the stacked body does not include any member serving as a core;
the individual wiring layers are connected to one another by wiring lines penetrating through the insulating layers; and
a diameter of each of the wiring lines on one side of the stacked body is larger than a diameter on the other side of the stacked body.
15. A semiconductor package in which a semiconductor chip is mounted on a wiring board as defined in claim 1 .