Method of adjusting resistance of a thermistor
OwnerMilton Schonbergerinventor
Life of this patent
Estimating the term…
Abstract
A wafer thermistor with opposite, generally flat surfaces has two spaced apart contacts on one surface and a third contact on the opposite surface; the third contact is considerably larger in surface area than the two contacts on the one surface; the conductors leading to the thermistor are connected to the two contacts on the one surface; to change the resistance of the thermistor, removal of a larger percentage of the surface area of one of the contacts will change the resistance of the thermistor by only a fraction of the surface area of the contact that was removed.
Claims38
A method of adjusting the resistance of a thermistor, comprising:
- forming a first and a second electric contact on one surface area of an element of thermistor semiconductor material;
- forming a third electric contact on another surface area of the element of thermistor semiconductor material, the contacts being formed such that the one and the other surface areas overlapping such that the first and second electric contacts overlap the third electric contact;
- and the element of thermistor semiconductor material and the first, second and third contacts together comprise a thermistor;
- adjusting the resistance of the thermistor by trimming off part of at least one contact to reduce its area while keeping the one and the other surface areas overlapping such that the first and second electric contacts overlap the third electric contact after said trimming.
A method for adjusting the resistance of a thermistor comprising:
- forming a first and a second electric contact on one of two opposite surface areas of an element of thermistor semiconductor material;
- forming a third electric contact on the other of the two opposite surface areas of the element of thermistor semiconductor material, the contacts being formed such that both of the first and second electric contacts, on the one hand, overlap the third electric contact, on the other hand;
- and the element of thermistor semiconductor material and the first, second and third contacts together comprise a thermistor;
- applying a respective electric conductor to each of the first and second contacts;
- connecting the conductors to an electric meter which measures the resistance of the thermistor, and measuring the resistance of the thermistor;
- comparing the measured resistance of the thermistor against a standard;
- adjusting the resistance of the thermistor to bear a predetermined relationship to the standard by changing the area of the overlapping surface areas of at least one of the first and second contacts, on the one hand, and of the third contact, on the other hand and such changing of the areas being such that the first and second electric contacts continue to overlap the third electric contact after said trimming.
A method for adjusting the resistance of a thermistor, wherein the thermistor comprises an element of thermistor semiconductor material, a first and a second contact on one surface area of the element of thermistor semiconductor material and a third electric contact on another surface area of the element of thermistor semiconductor material;
- the contacts being formed such that the one and the other surface areas overlapping such that the first and second electric contacts overlap the third electric contact;
- the method comprising adjusting the resistance of the thermistor by changing the area of the overlapping surface areas of at least one of the first and second contacts, on the one hand, and of the third contact, on the other hand, and such changing of the areas being such that the first and second electric contacts continue to overlap the third electric contact after said trimming.
Dependencies are inferred from the claim text.