Electronic circuit unit, imaging unit, and endoscope
An electronic circuit unit includes: a cable having a core of stranded thin wires, the core being covered with an outer surface, the outer surface at one end of the cable being removed to expose the core; a metallic tube that is tubular, the exposed core being inserted into an opening portion of the metallic tube; and a substrate including a connection land for connecting the core. The exposed core is connected to the connection land via the metallic tube by diffusion joining or ultrasound joining, the core has a diameter of 0.02 to 0.50 mm, the metallic tube has a thickness of 10 to 50 μm, and the metallic tube has an inner diameter that is larger than the diameter of the core by equal to or more than 1.1-fold and equal to or less than by 1.5-fold.
1. An electronic circuit unit comprising:
a cable having a core of stranded thin wires, the core being covered with an outer surface, the outer surface at one end of the cable being removed to expose the core;
a metallic tube that is tubular, the exposed core being inserted into an opening portion of the metallic tube; and
a substrate including a connection land for connecting the core, wherein
the exposed core is connected to the connection land via the metallic tube by diffusion joining or ultrasound joining,
the core has a diameter of 0.02 to 0.50 mm,
the metallic tube has a thickness of 10 to 50 μm, and
the metallic tube has an inner diameter that is larger than the diameter of the core by equal to or more than 1.1-fold and equal to or less than by 1.5-fold.
2. The electronic circuit unit according to claim 1 , wherein the metallic tube is made of a material identical to a material with which a surface of the connection land is formed.
3. The electronic circuit unit according to claim 1 , wherein the metallic tube is made of a material having a lower degree of hardness than a material of the core.
4. The electronic circuit unit according to claim 1 , wherein the metallic tube has a cylindrical shape.
5. The electronic circuit unit according to claim 1 , wherein the metallic tube is made of gold and is formed by a plating technique.
6. The electronic circuit unit according to claim 1 , wherein the connection land is provided with a groove.
7. An imaging unit comprising:
an imaging element configured to receive light and conduct photoelectric conversion to generate an electric signal; and
the electronic circuit unit according to claim 1 .
8. The imaging unit according to claim 7 , further comprising a flexible printed substrate extending from the imaging element in an optical axis direction of the imaging element, wherein
a substrate included in the electronic circuit unit is a multi-layer substrate formed on a surface of the flexible printed substrate, and an electronic component is mounted on the multi-layer substrate, and
the electronic circuit unit and the electronic component are located within a projection plane of the imaging element in the optical axis direction.
9. The imaging unit according to claim 7 , further comprising a circuit substrate connected to a sensor electrode via a first electrode pad and having an electronic component mounted on the circuit substrate, the sensor electrode being formed on a back surface of the imaging element, wherein
a substrate included in the electronic circuit unit is a deformed substrate connected to a second electrode pad formed on a back surface of the circuit substrate, and
the electronic circuit unit is located within a projection plane of the imaging element in the optical axis direction.
10. The imaging unit according to claim 7 , further comprising a circuit substrate connected to a sensor electrode via a first electrode pad the sensor electrode being formed on a back surface of the imaging element, wherein
a substrate included in the electronic circuit unit is a flexible printed substrate connected to a second electrode pad formed on a back surface of the circuit substrate, an electronic component being mounted on the flexible printed substrate, and
the electronic circuit unit and the electronic component are located within a projection plane of the imaging element in the optical axis direction.
11. An endoscope comprising an insertion portion having a distal end provided with the imaging unit according to claim 7 .