Temperature sensor - Patent Review 7387435

Create Free Account | License or Sell Your Patent | WikiPatents Marketplace | WikiPatents Blog

Temperature sensor

Get related patents on CD

United States Patent

7387435

Link to this page

http://www.wikipatents.com/7387435.html

Inventor(s)

Kishi; Masakazu (Kawasaki, JP)

Abstract

In a temperature sensor, especially in a temperature sensor using a resonator, based on a frequency of one oscillator circuit (resonator), frequencies of the other one or more oscillator circuits (resonators) are measured, and frequency-temperature characteristics of a plurality of resonators are synthesized in order to realize an accurate temperature sensor which does not require an accurate frequency reference regardless of a temperature change, and has a linear characteristic and a wide measurable temperature range. Also, two oscillator circuits have two resonators respectively with quadratic characteristics in which quadratic coefficients are the same and linear characteristics are different from each other, and a difference between oscillation frequencies of both oscillator circuits is obtained.

References Submit all comments and votes

*references marked with an asterisk below are user-added references

U.S. References

Add a new US reference:
[Vote on relevancy & make comments] [Display results only]
Reference	Relevancy	Comments	Reference	Relevancy	Comments
6700449 Ichimaru Mar,2004	Your vote accepted [0 after 0 votes]		6218763 Fujimoto et al. Apr,2001	Your vote accepted [0 after 0 votes]
6208063 Horikawa et al. Mar,2001	Your vote accepted [0 after 0 votes]		5912602 Takagi et al. Jun,1999	Your vote accepted [0 after 0 votes]
5899570 Darmawaskita et al. May,1999	Your vote accepted [0 after 0 votes]		5836691 Yamauchi Nov,1998	Your vote accepted [0 after 0 votes]
5774425 Ivanov et al. Jun,1998	Your vote accepted [0 after 0 votes]		5739416 Hoenk Apr,1998	Your vote accepted [0 after 0 votes]
5638418 Douglass et al. Jun,1997	Your vote accepted [0 after 0 votes]		5591945 Kent Jan,1997	Your vote accepted [0 after 0 votes]
5546810 Arikawa et al. Aug,1996	Your vote accepted [0 after 0 votes]		5498920 Okano et al. Mar,1996	Your vote accepted [0 after 0 votes]
5235844 Bonne et al. Aug,1993	Your vote accepted [0 after 0 votes]		5231880 Ward et al. Aug,1993	Your vote accepted [0 after 0 votes]
5214668 Satou et al. May,1993	Your vote accepted [0 after 0 votes]		4558248 Valentin Dec,1985	Your vote accepted [0 after 0 votes]
4551031 Ishikawa et al. Nov,1985	Your vote accepted [0 after 0 votes]		4537515 Dinger et al. Aug,1985	Your vote accepted [0 after 0 votes]
4468634 Takagi et al. Aug,1984	Your vote accepted [0 after 0 votes]		4437773 Dinger et al. Mar,1984	Your vote accepted [0 after 0 votes]
4415870 Zumsteg Nov,1983	Your vote accepted [0 after 0 votes]		4398115 Gagnepain et al. Aug,1983	Your vote accepted [0 after 0 votes]
4249418 Ebata Feb,1981	Your vote accepted [0 after 0 votes]		4210024 Ishiwatari et al. Jul,1980	Your vote accepted [0 after 0 votes]
July 1978 Jul,1980	Your vote accepted [0 after 0 votes]
[Vote on relevancy & make comments] [Display results only]

Foreign References

Other References

Technical Review Submit all comments and votes

Claims

What I claim is:

1. A temperature sensor comprising: two oscillator circuits each having a SAW resonator, one said SAW resonator utilizing a Rayleigh wave and the other said SAW resonator utilizing an SH wave such that said SAW resonators have different frequency-temperature characteristics; and a detection circuit for detecting a difference between a frequency of one oscillator circuit and a frequency of the other oscillator circuit and for detecting a temperature corresponding to the difference.

Description Submit all comments and votes

Previous Patent (Lockable push button for portable apparatus s...)

Next Patent (Ear-type clinical thermometer)