Thermal image detecting apparatus having detecting elements arranged on a straight line

• US 5,585,631 A
• Filed: 09/19/1995
• Issued: 12/17/1996
• Est. Priority Date: 09/17/1992
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Shimizu, Makoto, Deguchi, Takashi, Chinomi, Takahito, Mukai, Yasuhito
• Primary Examiner(s): FIELDS, CAROLYN
• Application Number:
  US08/530,442
• Time in Patent Office: 455 Days
• Field of Search: 250/332, 250/334, 250/353, 250/338.3, 250/349, 250/DIG. 1, 250/342, 340/567
• US Class Current: 250/332
• CPC Class Codes: G08B 13/191 using pyroelectric sensor means
• CPC Class Codes: Y10S 250/01 Passive intrusion detectors

Abstract

An array of pyroelectric type heat detecting elements of different which are integrally incorporated with an optical system and which are arranged one dimensionally in a plane orthogonal to the optical axis of the optical system, and the optical system and the array of pyroelectric type heat detecting elements are rotated integrally with each other; thereby it is possible to obtain a two dimensional thermal image with a relatively simple structure.

Claims

1. A thermal image detecting apparatus for obtaining a two-dimensional thermal image, said apparatus comprising:

an array of heat detecting elements having different dimensions and arranged one-dimensionally on a straight line;

an optical system integrally incorporated with said array of heat detecting elements;

a rotary shaft on which said array of heat detecting elements and said optical system are mounted, said straight line being inclined at a predetermined angle to said rotary shaft; and

means for rotating said rotary shaft at a predetermined speed so as to rotate said array and said optical system at said predetermined speed which permits said array of heat detecting elements to detect a temperature of a human body in motion, said predetermined speed being larger than a horizontal viewing angle over which said array scans during a measurement of said temperature divided by a time interval required for said measurement of said temperature.

2. An apparatus as set forth in claim 1, wherein said elements have different lengths parallel to said straight line, and said different dimensions comprise said different lengths.

3. An apparatus as set forth in claim 2, wherein said rotary shaft is disposed vertically, and wherein said array comprises first heat detecting elements with substantially horizontal viewing areas and first lengths and second heat detecting elements with substantially vertical viewing areas and second lengths greater than said first lengths.

4. An apparatus as set forth in claim 1, wherein said elements have different widths perpendicular to said straight line, and wherein said different dimensions comprise said different widths, so as to compensate an optical aberration of the optical system, whereby widthwise viewing angles of said elements through said optical system are set to be constant.

5. An apparatus as set forth in claim 1 wherein spaces between said elements are set to be substantially constant.

6. An apparatus as set forth in claim 1, wherein spaces between said elements are set to be different from one another.

7. An apparatus as set forth in claim 1, wherein said rotary shaft is disposed vertically, and wherein said rotational speed is set so that said array in combination with said optical system horizontally scans with horizontal blind zones, each of said horizontal blind zones having a horizontal width substantially equal to a horizontal width of said array.

8. An apparatus as set forth in claim 1, wherein said heat detecting elements in said array are pyroelectric type heat detecting elements.

9. An apparatus as set forth in claim 1, wherein said predetermined angle is an acute angle.

10. An apparatus as set forth in claim 1, wherein said heat detecting elements in said array are of different areas.

11. An apparatus as set forth in claim 1, wherein said rotary shaft is disposed vertically, and wherein said rotational speed is controllably set to either a first rotational speed so that said array in combination with said optical system horizontally scans with horizontal blind zones, each of said horizontal blind zones having a horizontal width substantially equal to a horizontal width of said array or a second rotational speed so that said array in combination with said optical system horizontally scans with no horizontal blind zones.

12. A thermal image detecting apparatus for obtaining a two-dimensional thermal image, said apparatus comprising:

an array of heat detecting elements having different dimensions and arranged one-dimensionally on a straight line;

an optical system integrally incorporated with said array of heat detecting elements;

a rotary shaft on which said array of heat detecting elements and said optical system are mounted, said straight line being inclined at a predetermined angle to said rotary shaft; and

means for rotating said rotary shaft at a rotational speed so as to rotate said array and said optical system at said rotational speed which permits said array of heat detecting elements to detect a temperature of a human body in motion;

wherein said rotational speed is set so that said array in combination with said optical system horizontally scans with no horizontal blind zones.