Optical device
View Patent ↗An optical device includes a base of ring shape, and a light emitting/receiving element and a transparent plate both attached to the base. A side face of the opening of the base is formed to have a taper serving as a draft for a molding resin. A side surface of the transparent plate is formed to have a taper widened upwardly and corresponding to the draft. These side face and surface engage each other with an adhesive layer interposed therebetween. A hologram may be mounted instead of the transparent plate.
1. An optical device comprising:
a base provided with an opening which is a hole through the base and whose side face has a taper widened toward a front side face of the base;
a wire embedded in the base so that an internal terminal portion and an external terminal portion are exposed from a back side face of the base and are in the same plane;
a transparent member covering the opening from the front side face of the base; and
a light emitting/receiving element coupled to the internal terminal portion of the wire with a bump so that the light emitting/receiving element covers the opening from the back side face of the base,
wherein a side surface of the transparent member has a taper widening in an upward direction so that at least a part of the side surface of the member engages the side face of the opening of the base, and
the opening is located between the light emitting/receiving element and the transparent member.
2. The device of claim 1 , wherein the taper angle of the side face of the opening of the base is within 1 to 20°.
3. The device of claim 1 , wherein the taper angle of the side face of the opening of the base is within 3 to 12°.
4. The device of claim 1 , wherein the upper area of the side face of the opening of the base is formed to have an additional taper which has a greater taper angle than the taper of the lower area.
5. The device of claim 1 , wherein the side face of the opening of the base is formed to have a step.
6. The device of claim 5 , wherein a bottom portion of the transparent member engages the step of the base.
7. The device of claim 1 , wherein the transparent member is a glass window, and the difference in vertical position between the upper surfaces of the transparent member and the base is 300 μm or smaller.
8. The device of claim 1 , wherein the transparent member is a glass window, and the difference in vertical position between the upper surfaces of the transparent member and the base is 100 μm or smaller.
9. The device of claim 1 , wherein the transparent member is a hologram.
10. The device of claim 1 , wherein the side face of the opening of the base engages only a part of the side surface of the transparent member.
11. The device of claim 1 , wherein a portion of the transparent member extends laterally over the front side face of the base.
12. The device of claim 11 , wherein the portion of the transparent member engages the front side face of the base.
13. The device of claim 1 , wherein an upper potion of the transparent member has a flange disposed on the front side face of the base.
14. The device of claim 1 , further comprising:
a solder ball coupled to the external terminal portion of the wire,
wherein the external terminal portion is located in a position higher than a back surface of the light emitting/receiving element, and
a top of the solder ball is located in the same position as the back face of the light emitting/receiving element, or in a position lower than the back face of the light emitting/receiving element.
15. The device of claim 1 ,
wherein the side face of the opening has one straight taper, and
the transparent member is held on the middle of the taper of the opening.
16. The device of claim 1 ,
wherein the internal terminal portion, the external terminal portion and the back side face of the base are flush.
17. The device of claim 1 , further comprising:
a sealing resin provided around the light emitting/receiving element.
18. The device of claim 1 ,
wherein a back surface of the light emitting/receiving element is exposed.
19. An optical device comprising:
a base provided with a through hole whose side face has a taper widened upward;
a wire buried in the base so that an internal terminal portion and an external terminal portion are exposed from the lower surface of the base;
a light emitting/receiving element electrically connected to the internal terminal portion of the wire with a bump; and
a transparent member whose side surface has a taper widened upward so that at least part of the side surface of the member engages the side face of the base.
20. The device of claim 19 ,
wherein the side face of the through hole has one straight taper, and
the transparent member is held on the middle of the taper of the through hole.