Object detecting system using ultrasonic waves

• US 4,896,304 A
• Filed: 05/31/1989
• Issued: 01/23/1990
• Est. Priority Date: 02/07/1984
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tanigawa, Hiroshi
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): Pihulic, Daniel T.
• Application Number:
  US07/359,341
• Time in Patent Office: 237 Days
• Field of Search: 367/103, 367/105, 367/138, 367/7, 367/11, 73/626
• US Class Current: 367/103
• CPC Class Codes: G01S 15/02 using reflection of acoustic waves G01S15/66 takes precedence
• CPC Class Codes: G01S 15/06 Systems determining the position data of a target
• CPC Class Codes: G01S 15/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S15/46

Abstract

An object detecting system including an ultrasonic transducer element array including first to N-th ultrasonic transducer elements, a first means for intermittently supplying burst driving pulses to the ultrasonic transducer elements at different times in each of successive intermittent periods. Also, the object detecting system includes a second means coupled between each of the first to N-th ultrasonic transducer elements and the first means for applying the burst driving pulses to the first to N-th ultrasonic transducer elements, successively. The second means includes first to N-th delay circuits which delay applying the burst driving pulses to the ultrasonic transducer elements with the first to N-th delay circuits giving different delay time periods, respectively, so that the delay time periods are successively longer in the order from the first delay circuit to the N-th delay circuit and each of the ultrasonic transducer elements is supplied with the burst driving pulse through two kinds of the delay circuits connected in parallel in such a manner that the M-th number of the ultrasonic transducer elements is coupled with the M-th and (N-M+1) th delay circuits, with M being a number from one to N.

Claims

1. An object detecting system comprising:

an ultrasonic transducer element array comprising first to N-th ultrasonic transducer elements;

a first means for intermittently supplying burst driving pulses to said ultrasonic transducer elements at different times in each of successive intermittent periods; and

a second means coupled between each of said first to N-th ultrasonic transducer elements and said first means for applying said burst driving pulses to said first to N-th ultrasonic transducer elements, successively, said second means comprising first to N-th delay circuits which delay applying said burst driving pulses to said ultrasonic transducer elements, said first to N-th delay circuits giving different delay time periods, respectively, so that said delay time periods are successively longer in the order from said first delay circuit to said N-th delay circuit, and each of said ultrasonic transducer elements being supplied with the burst driving pulse through two kinds of said delay circuits connected in parallel in such a manner that M-th number of said ultrasonic transducer elements is coupled with M-th and (N-M+1)-th delay circuits, with M being a number from one to N.

2. The object detecting system as claimed in claim 1, further comprising:

an ultrasonic receiving element array comprising first to N-th ultrasonic receiving elements;

a third means for detecting an ultrasonic wave received by said ultrasonic receiving element array, said third means having first to N-th delay means coupled with said first to N-th ultrasonic receiving elements, respectively, said first to N-th delay means giving the same delay time periods as said first to N-th delay circuits, respectively, and said third means further comprising a first output means combining the delayed signals obtained from said first to N-th delay means; and

a fourth means for detecting an ultrasonic wave received by said ultrasonic receiving element array, said fourth means having (N+1)-th to (N+N)-th delay means coupled with first to N-th ultrasonic receiving elements, respectively, said (N+N)-th to (N+1)th delay means giving the same delay time periods as said first to N-th delay circuits, respectively, and said fourth means further comprising a second output means combining the delayed signal obtained from said (N+1)-th to (N+N)-th delay means.

3. The object detecting system as claimed in claim 1, wherein said ultrasonic transducer element array is a linear array in which said first to N-th ultrasonic transducer elements are arranged in a line.

4. The object detecting system as claimed in claim 3, wherein said two kinds of said delay circuits are coupled with the ultrasonic transducer element through an adding means for adding said burst driving pulses derived from said two kinds of said delay circuits.

5. The object detecting system as claimed in claim 4, wherein said second means is formed in a three-phase transfer type charge coupled device.