Title:
STRUCTURE OF PYROELECTRIC SENSOR APPARATUS
Document Type and Number:
Japanese Patent JPH01113624
Kind Code:
A
Abstract:
PURPOSE:To reduce a cost, by providing a reflecting part for expanding the detecting range, so that incident infrared rays are reflected from reflecting surfaces, which are vertically provided at the edge parts of a window in the opening direction of the window in the case of the main body of a sensor. CONSTITUTION:Vertical pieces 17 of a reflecting member 6 are arrange at the outsides of the edge pars of both sides of a window 2 of a case cover 3a so that the opening direction of the window 2 and the direction of reflecting surfaces 5 are the same. A filter 13, whose area is smaller than a conventional filter, is used. The size of the window 2 of the case cover 3a is made smaller in correspondence with the size of the filter 13. Light from the side part is inputted through an opening 16 of the reflecting member 6 and reflected from the reflecting surfaces 5 of the vertical pieces 17 of the reflecting member 6. The direction of the light is changed. The light passes through the filter 13. Even if the area of the filter 13 is made small at this time, the light is reflected from the reflecting surfaces 5 of the reflecting member 6. Therefore, the detecting range is expanded. Since the area of the costly filter is made small, the cost can be lowered.
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Inventors:
KOJIMA YUTAKA
KONISHI YOJI
KONISHI YOJI
Application Number:
JP27108287A
Publication Date:
May 02, 1989
Filing Date:
October 27, 1987
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G01J1/02; G01J5/02; G01J5/34; G01V8/14; H01L31/02; (IPC1-7): G01J1/02; G01J5/02; G01V9/04; H01L31/02
Domestic Patent References:
| JPS57164964A | 1982-10-09 | |||
| JPS6135794A | 1986-02-20 |
Attorney, Agent or Firm:
Ishida Choshichi