Infrared-sensor filter member, manufacturing method thereof, infrared sensor, and manufacturing method thereof

1. An infrared-sensor filter member, comprising:

an optical filter for an infrared sensor; and

a recess portion formed by one surface of the optical filter and a first member, wherein

a bottom surface of the recess portion includes a center portion formed by one surface of the optical filter and a peripheral portion formed by the first member, and

side walls of the recess portion are formed by the first member.

2. The infrared-sensor filter member according to claim 1 , wherein

an inner side surface of the side wall is inclined relative to the bottom surface such that an area of an opening surface of the recess portion is larger than an area of the bottom surface of the recess portion.

3. The infrared-sensor filter member according to claim 1 , further comprising a second member with an emissivity equal to or smaller than 0.3, wherein

at least a part of the second member is exposed from an outer surface of the infrared-sensor filter member.

4. The infrared-sensor filter member according to claim 3 , wherein

another surface of the optical filter is exposed from one of outer surfaces of the infrared-sensor filter member, and

at least the part of the second member is exposed from the one of the outer surfaces of the infrared-sensor filter member.

5. The infrared-sensor filter member according to claim 4 , wherein at least the part of the second member is exposed from the outer surface of the infrared-sensor filter member so as to surround the other surface of the optical filter in a plan view.

6. The infrared-sensor filter member according to claim 3 , wherein at least the part of the second member is exposed from an outer side surface of the infrared-sensor filter member.

7. The infrared-sensor filter member according to claim 1 , wherein an emissivity of the first member is equal to or larger than 0.7.

8. The infrared-sensor filter member according to claim 1 , wherein an emissivity of the first member is equal to or smaller than 0.3.

9. The infrared-sensor filter member according to claim 8 , wherein an inner side surface of the side wall of the recess portion is subjected to blackening treatment.

10. An infrared sensor, comprising:

the infrared-sensor filter member according to claim 1 ;

an infrared sensor member including an infrared sensor element; and

a connecting member adopted to connect the infrared-sensor filter member and the infrared sensor member, wherein

the infrared-sensor filter member is disposed on the infrared sensor member such that the recess portion covers a light receiving surface of the infrared sensor element.

11. The infrared sensor according to claim 10 , wherein the infrared sensor member further includes:

a third member with an emissivity equal to or smaller than 0.3; and

a molded member adopted to seal the infrared sensor element and the third member, and wherein

the infrared-sensor filter member is disposed on one of outer surfaces of the infrared sensor member, and

at least a part of the third member is exposed from the one of the outer surfaces of the infrared sensor member.

12. The infrared sensor according to claim 11 , wherein at least the part of the third member is exposed from the one of the outer surfaces of the infrared sensor member in a region outside the infrared-sensor filter member in a plan view.

13. The infrared sensor according to claim 10 , wherein

the light receiving surface of the infrared sensor element is exposed from one of the outer surfaces of the infrared sensor member, and

the light receiving surface of the infrared sensor element is surround by a member with an emissivity equal to or larger than 0.7 on the one of the outer surfaces of the infrared sensor member.

14. An infrared sensor, comprising:

an infrared-sensor filter member including an optical filter for an infrared sensor and a first member having sidewall and bottom surface zones;

an infrared sensor member including an infrared sensor element; and

a recess portion formed between the infrared-sensor filter member and the infrared sensor member, wherein:

side walls of the recess portion are defined by the first member sidewall zones,

at least a part of a top surface of the recess portion is defined by a light receiving surface of the infrared sensor element,

a center portion of a bottom surface of the recess portion is defined by the optical filter, and

a peripheral portion of the bottom surface is defined by the first member bottom surface zones.