Sealing of optical module with O-ring and liquid resin
An optical module having a high-moisture-proof package structure in which dew condensation does not occur is provided. An optical module includes optical components including a light source, a pedestal on which the optical components are mounted, a cover which is combined to the pedestal to seal the optical components, and an emitting window disposed in the cover to take light from the light source outside. The pedestal and the cover are sealed with an O ring and a liquid seal material such that a compression direction of the O ring and a compression direction of the liquid seal material are almost perpendicular to each other.
1. An optical module for a video device, comprising:
optical components including a light source;
a pedestal on which the optical components are mounted;
a cover which is combined to the pedestal to seal the optical components; and
an emitting window disposed in the cover to take light from the light source outside,
wherein the pedestal and the cover are sealed with a first O ring which is a loop of elastomer having a circular cross-section and a hardened seal of a first liquid seal material,
wherein the first O ring is arranged at an optical components side inwardly from the first liquid seal material, and
wherein a thickness of the first liquid seal material is adjustable with a screw that fixes the cover to the pedestal.
2. The optical module according to claim 1 , wherein
a sealing of the pedestal and the cover is performed such that a compression direction of the first O ring and a compression direction of the first liquid seal material are almost perpendicular to each other.
3. The optical module according to claim 1 , wherein
the pedestal includes a step to dispose the first O ring and a groove in which the first liquid seal material is applied on an outer peripheral side of the step and in which the cover is fitted.
4. The optical module according to claim 3 , wherein
the step has a height larger than a thickness of the first O ring.
5. The optical module according to claim 1 , wherein
a thickness of the first liquid seal material is adjustable by striking the pedestal to a planar portion formed on the outer peripheral portion of the cover.
6. The optical module according to claim 1 , wherein
the cover and the emitting window are sealed with a second O ring and a hardened seal of a second liquid seal material such that the compression direction of the second O ring and the compression direction of the second liquid seal material are almost perpendicular to each other.
7. The optical module according to claim 6 , wherein
the emitting window has a step to dispose the second O ring and a planar portion to cause the emitting window to adhere to the cover with the second liquid seal material.
8. The optical module according to claim 1 , wherein
a cooling Peltier element is attached.
9. A method of making an optical module for a video device including optical components including a light source, a pedestal on which the optical components are mounted, a cover which is combined to the pedestal to seal the optical components, and an emitting window disposed in the cover to take light from the light source outside, the method comprising:
preparing the pedestal having a step portion to dispose an O ring thereon and a groove in which a liquid seal material is applied on an outer peripheral side of the step portion to fit the cover in the groove;
disposing the O ring, which is a loop of elastomer having a circular cross-section, on the step portion;
applying or disposing the liquid seal material in the groove;
fitting the cover in the groove to press the liquid seal material into the groove; and
adjusting a thickness of the liquid seal material by adjusting a screw to fix the cover to the pedestal.
10. The method of making an optical module according to claim 9 , further comprising
thermally hardening the liquid seal material.
11. The optical module according to claim 6 ,
wherein a thickness of the second liquid seal material is adjustable with a plurality of screws that fix the emitting window to the cover.
12. The optical module according to claim 6 ,
wherein the second O ring is arranged at an optical components side inwardly from the second liquid seal material, and
wherein the emitting window is fixed to the cover with a plurality of screws from an outside of the cover.