Optical module
An optical module includes: a casing in which light is propagated; a heating portion; a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing; and a first member thermally connected to the heating portion and the device, the first member including a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing.
1 . An optical module comprising:
a casing in which light is propagated;
a heating portion;
a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing; and
a first member thermally connected to the heating portion and the device, the first member including
a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing, wherein the hollow is a closed space.
2 . The optical module according to claim 1 , wherein the casing is hermetically sealed.
3 . The optical module according to claim 1 , wherein the hollow is opened to an outside of the casing.
4 . The optical module according to claim 1 , wherein
the hollow has an opening portion toward the inside of the casing, and
the optical module further comprises a cover configured to at least partially cover the opening portion.
5 . The optical module according to claim 4 , wherein the cover is at least one of: a second member bonded to the first member; and adhesive configured to bond the first member and the second member.
6 . The optical module according to claim 1 , wherein the hollow is at least partially located inside the casing.
7 . The optical module according to claim 1 , wherein the hollow is located outside the casing.
8 . The optical module according to claim 1 , wherein
the heating portion and the device are arranged at an interval in a first direction, and
the hollow includes a plurality of hollows arranged at intervals in the first direction.
9 . The optical module according to claim 1 , wherein
the heating portion and the device are arranged at an interval in a first direction, and
the hollow includes a plurality of hollows arranged at intervals in a second direction that crosses the first direction.
10 . The optical module according to claim 1 , wherein the hollow includes a heat transfer layer having higher thermal conductivity than the first member, the heat transfer layer being arranged on an inner surface of the hollow.
11 . The optical module according to claim 1 , wherein
the device includes a plurality of devices, and
the hollow is located in a heat transfer path between the plurality of devices.
12 . The optical module according to claim 1 , wherein the heating portion is located inside the casing.
13 . The optical module according to claim 1 , wherein the heating portion is located outside the casing.
14 . The optical module according to claim 1 , wherein the heating portion is configured to operate electrically.
15 . The optical module according to claim 14 , wherein the heating portion is mounted on the first member in a flip-chip manner.
16 . The optical module according to claim 1 , further comprising:
a bonding portion for a plurality of members, the bonding portion being heated at a time of bonding.
17 . The optical module according to claim 16 , wherein
the bonding portion is arranged outside the casing, and
the hollow is a closed space and located outside the casing.
18 . The optical module according to claim 1 , wherein the casing is configured to serve as the first member.
19 . The optical module according to claim 1 , wherein the first member includes a support configured to support the device.
20 . The optical module according to claim 19 , wherein the first member includes a fixing member fixed to the support member.
21 . An optical module comprising:
a casing in which light is propagated;
a heating portion;
a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing; and
a first member thermally connected to the heating portion and the device, the first member including
a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing,
wherein the hollow is located outside the casing.
22 . An optical module comprising:
a casing in which light is propagated;
a heating portion;
a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing; and
a first member thermally connected to the heating portion and the device, the first member including
a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing,
wherein the heating portion is located outside the casing.
23 . An optical module comprising:
a casing in which light is propagated;
a heating portion;
a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing;
a first member thermally connected to the heating portion and the device, the first member including a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing; and
a bonding portion for a plurality of members, the bonding portion being heated at a time of bonding, wherein:
the bonding portion is arranged outside the casing, and
the hollow is a closed space and located outside the casing.
24 . An optical module comprising:
a casing in which light is propagated;
a heating portion;
a device arranged inside the casing and configured to change, when heated, characteristics of the light propagated inside the casing; and
a first member provided in contact with an inner surface of the casing and thermally connected to the heating portion and the device, the first member including
a hollow arranged in a heat transfer path from the heating portion to the device and configured to prevent convective heat transmission to an inside of the casing,
wherein a heat transfer path is formed from the heating portion to the device via the casing and the first member, and the hollow extends from the first member to the casing and is opened to an outside of the casing so as to suppress heat transfer from the heating portion to the device.