Device for detecting an object including a light-sensitive detecting array

• US 5,196,689 A
• Filed: 10/11/1991
• Issued: 03/23/1993
• Est. Priority Date: 10/16/1990
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Sugita, Keizo, Ishizuka, Kentaro, Saito, Shunei, Kaneko, Hitoshi, Tajiri, Akira, Okamura, Iwao
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US07/775,134
• Time in Patent Office: 529 Days
• Field of Search: 250/561, 250/221, 250/222.1, 250/201.8, 250/203.3, 250/203.7, 250/203.6, 250/203.4, 250/208.2, 250/206.1, 250/206.2, 250/206.3, 356/141, 356/152, 356/1, 356/4
• US Class Current: 250/206.1
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 3/781 Details
• CPC Class Codes: G01S 3/783 using amplitude comparison of signals derived from static detectors or detector systems
• CPC Class Codes: G01S 5/16 using electromagnetic waves other than radio waves

Abstract

A device for detecting an object by detecting an infrared ray emitted from a moving object. The device includes a plurality of light receiving elements, each being disposed so as to receive infrared rays at a predetermined directional optical angle, and the position of and distance to the object is detected based on detection results by the respective light receiving elements. The moving speed and acceleration of the object are also detected from detection results by the respective light receiving elements, taking time-varying factors into consideration.

Claims

1. A device for detecting an object, which device detects the position of said object on the basis of receiving a light ray projected from said object by using a plurality of light receiving elements, wherein

at least two of said light receiving elements are arranged, a light receiving angle of each of said light receiving elements being set so that each of said light receiving elements has an equal length and mutually exclusive detection area on a light receiving plane.

2. A device for detecting an object according to claim 1, wherein said light receiving elements are disposed on a reflector body having slits, and said detection area on said light receiving plane is divided equally by said slits.

3. A device for detecting an object according to claim 2, wherein said light receiving elements are disposed on said reflector body through light receiving units, each of said light receiving units being generally parabolic in shape.

4. A device for detecting an object according to claim 3, wherein said slit shuttles between a predetermined area on a time sharing basis.

5. A device for detecting an object according to claim 2, wherein said slit shuttles between a predetermined area on a time sharing basis.

6. A device for detecting an object according to claim 2, wherein said reflector body is rectangular shaped;

the interior thereof is partitioned by partition walls; and

each of partitioned areas accommodates a single light receiving element.

7. A device for detecting an object, which device detects said object by detecting a light ray projected from said object, said device comprising:

a plurality of light receiving means, each having a predetermined directional optical angle for receiving said infrared light ray;

synthesized detection area forming means for forming a plurality of synthesized detection areas obtained by synthesizing the light receiving areas of said plurality of light receiving means, said synthesized detection areas including one area which involves the detection area of only one of said plurality of light receiving means, and another area which includes the detection area of only two of said plurality of light receiving means;

synthesized detection area judgment means for judging a synthesized detection area based on detection results by said plurality of light receiving means, and

distance judgment means for judging a distance to said object based on a judgment result by said synthesized detection area judgment means.

8. A device for detecting an object, which device detects the presence of said object by detecting a light ray projected from said object, said device comprising:

a plurality of light receiving means, each having a predetermined directional optical angle for receiving said infrared light ray;

synthesized detection area forming means for forming a plurality of synthesized detection areas obtained by synthesizing the light receiving areas of said plurality of light receiving means, said synthesized detection areas including one area which involves the detection area of only one of said plurality of light receiving means, and another area which includes the detection area of only two of said plurality of light receiving means;

synthesized detection area judgment means for judging a synthesized detection area based on detection results by said plurality of light receiving means; and

angular velocity judgment means for judging an angular velocity of said object based on a judgment result by said synthesized detection area judgment means.

9. A device for detecting an object, which device detects the presence of said object by receiving a light ray projected from said object, said device comprising:

a plurality of light receiving means, each having a predetermined directional optical angle for receiving said infrared light ray;

synthesized detection area forming means for forming a plurality of synthesized detection areas obtained by synthesizing the light receiving areas of said plurality of light receiving means, said synthesized detection areas including one area which involves the detection area of only one of said plurality of light receiving means, and another area which includes the detection area of only two of said plurality of light receiving means;

synthesized detection area judgment means for judging a synthesized detection area based on detection results by said plurality of light receiving means, and

angular acceleration judgment means for judging an angular acceleration to said object based on a judgment result by said synthesized detection area judgment means.

10. A device for receiving light rays, comprising a plurality of light receiving units, each having the same directivity, being disposed adjacent to one another so that the light receiving ranges thereof overlap one upon the other, and each unit having an inverted conical shaped antenna, wherein a lateral surface thereof is connected to a lateral surface of an antenna of an adjacent unit.

11. A device for receiving light rays according to claim 10, wherein each of said plurality of light receiving units has a non-reflecting receiver absorbing an infrared light ray and receives only a directly infrared light ray with a light receiving element disposed within said light receiving unit.

12. A device for receiving light rays according to claim 10, wherein each of said plurality of light receiving units is so arranged that a portion surrounding said light receiving element is covered with a non-reflecting member absorbing an infrared light ray so as to receive only a straight infrared light ray from a light projecting unit and that a light receiving hole is disposed on said non-reflecting member.