JPH039097U - - Google Patents
Info
- Publication number
- JPH039097U JPH039097U JP6941189U JP6941189U JPH039097U JP H039097 U JPH039097 U JP H039097U JP 6941189 U JP6941189 U JP 6941189U JP 6941189 U JP6941189 U JP 6941189U JP H039097 U JPH039097 U JP H039097U
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- integrated
- circuit
- smoke detector
- integrated circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Description
第１図は本考案の実施例の回路図、第２図ａ，
ｂは同上の回路の素子を実装したプリント基板の
拡大上面図、側面図、第３図ａ〜ｂは同上のプリ
ント基板にホルダーを実装した状態の上面図、正
面図、背面図、側面断面図、第４図は同上の全体
の一部破断した側面図、第５図は従来例の説明用
概略構成図である。
１……集積回路、６……プリント基板、７……
金属板、２……受光素子、３……発光素子、８…
…ホルダー、９……金属板である。
Figure 1 is a circuit diagram of an embodiment of the present invention, Figure 2a,
b is an enlarged top view and side view of the printed circuit board on which the elements of the above circuit are mounted, and Figures 3 a to b are a top view, front view, rear view, and side sectional view of the same printed circuit board with the holder mounted. , FIG. 4 is a partially cutaway side view of the same as above, and FIG. 5 is a schematic configuration diagram for explaining the conventional example. 1... integrated circuit, 6... printed circuit board, 7...
Metal plate, 2... Light receiving element, 3... Light emitting element, 8...
...Holder, 9...It is a metal plate.
Claims (1)
増幅して該増幅された出力が予め定めた値以上に
なると感知信号を出力する光電式煙感知器におい
て電気的ノイズに弱い受光部及び信号増幅器の集
積可能な回路部位を集積回路で構成するとともに
該集積不可能で上記受光部及び増幅部に付加され
る回路部品を集積回路周辺に配置して上記集積回
路及び回路部品をシールド用の金属板で覆つたこ
とを特徴とする光電式煙感知器。 (2) 受光部の受光素子を別のシールド用の金属
板で覆つたことを特徴とする請求項１記載の光電
式煙感知器。[Claims for Utility Model Registration] (1) A photoelectric smoke detector that receives and amplifies light from a light emitting part scattered by smoke and outputs a detection signal when the amplified output exceeds a predetermined value. In the above, the circuit parts that can be integrated, such as the light receiving part and the signal amplifier, which are susceptible to electrical noise, are constructed with an integrated circuit, and the circuit parts that cannot be integrated and are added to the light receiving part and the amplifying part are arranged around the integrated circuit. A photoelectric smoke detector characterized by having an integrated circuit and circuit components covered with a metal plate for shielding. (2) The photoelectric smoke detector according to claim 1, wherein the light receiving element of the light receiving portion is covered with another metal plate for shielding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6941189U JPH039097U (en) | 1989-06-14 | 1989-06-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6941189U JPH039097U (en) | 1989-06-14 | 1989-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH039097U true JPH039097U (en) | 1991-01-29 |
Family
ID=31604690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6941189U Pending JPH039097U (en) | 1989-06-14 | 1989-06-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039097U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117952U (en) * | 1974-07-25 | 1976-02-09 |
-
1989
- 1989-06-14 JP JP6941189U patent/JPH039097U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117952U (en) * | 1974-07-25 | 1976-02-09 |
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