Stacked lens structure with a lens portion having a black resin comprising a plurality of voids
The present technology relates to, in a stacked lens structure formed by stacking wafer substrates, the stacked lens structure that enables implementation of a diaphragm function and a method of manufacturing the same, and an electronic device. In the stacked lens structure, substrates with lens each having a lens resin portion disposed inside a through hole formed in a substrate are directly bonded and stacked. The stacked lens structure includes a black resin having a transmittance distribution monotonously decreasing from a lens center toward a peripheral portion on an upper surface or a lower surface of the lens resin portion of at least one of the substrates with lens. The present technology can be applied to, for example, a camera module in which a plurality of lenses is stacked and the like.
1. A stacked lens structure, comprising:
a plurality of substrates directly bonded to one another and stacked on one another, wherein
each substrate of the plurality of substrates comprises a lens resin portion inside a through hole formed in a respective substrate of the plurality of substrates, and
the lens resin portion includes a lens; and
a black resin on one of an upper surface or a lower surface of the lens resin portion of at least one substrate of the plurality of substrates, wherein
the black resin has a transmittance distribution that monotonously decreases from a center of the lens resin portion toward a peripheral portion of the lens resin portion,
the black resin comprises a plurality of voids, and
an interval between the plurality of voids monotonously increases from the center of the lens resin portion toward the peripheral portion of the lens resin portion.
2. The stacked lens structure according to claim 1 , wherein a film thickness of the black resin monotonously increases from the center of the lens resin portion toward the peripheral portion of the lens resin portion.
3. The stacked lens structure according to claim 1 , wherein
the lens resin portion includes a lens portion and a support portion, and
a film thickness of the support portion monotonously decreases from the center of the lens resin portion toward the peripheral portion of the lens resin portion.
4. The stacked lens structure according to claim 1 , wherein a size of the plurality of voids monotonously decreases from the center of the lens resin portion toward the peripheral portion of the lens resin portion.
5. The stacked lens structure according to claim 1 , wherein the plurality of voids is filled with a low refractive index material having a lower refractive index than the black resin.
6. The stacked lens structure according to claim 1 , wherein the plurality of voids is filled with a same material as the lens resin portion.
7. The stacked lens structure according to claim 1 , wherein each void of the plurality of voids has an air gap.
8. A method of manufacturing a stacked lens structure, the method comprising:
forming a black resin on one of an upper surface or a lower surface of a lens resin portion of at least one substrate of a plurality of substrates, wherein
the lens resin portion includes a lens,
the lens resin portion is inside a through hole formed in a respective substrate of the plurality of substrates,
the black resin has a transmittance distribution that monotonously decreases from a center of the lens resin portion toward a peripheral portion of the lens resin portion,
the black resin comprises a plurality of voids, and
an interval between the plurality of voids monotonously increases from the center of the lens resin portion toward the peripheral portion of the lens resin portion; and
directly bonding and stacking the plurality of substrates including the at least one substrate.
9. An electronic device, comprising:
a camera module including a stacked lens structure, wherein the stacked lens structure includes:
a plurality of substrates directly bonded to one another and stacked on one another, wherein
each substrate of the plurality of substrates comprises a lens resin portion inside a through hole formed in a respective substrate of the plurality of substrates, and
the lens resin portion includes a lens; and
a black resin on one of an upper surface or a lower surface of the lens resin portion of at least one substrate of the plurality of substrates, wherein
the black resin has a transmittance distribution that monotonously decreases from a center of the lens resin portion toward a peripheral portion of the lens resin portion,
the black resin comprises a plurality of voids, and
an interval between the plurality of voids monotonously increases from the center of the lens resin portion toward the peripheral portion of the lens resin portion.
10. A stacked lens structure, comprising:
a plurality of substrates directly bonded to one another and stacked on one another, wherein
each substrate of the plurality of substrates comprises a lens resin portion inside a through hole formed in a respective substrate of the plurality of substrates, and
the lens resin portion includes a lens; and
a black resin on one of an upper surface or a lower surface of the lens resin portion of at least one substrate of the plurality of substrates, wherein
the black resin has a transmittance distribution that monotonously decreases from a center of the lens resin portion toward a peripheral portion of the lens resin portion,
the black resin comprises a plurality of voids,
an interval between the plurality of voids monotonously increases from the center of the lens resin portion toward the peripheral portion of the lens resin portion, and
the plurality of voids is filled with a same material as the lens resin portion.