JP7624810B2

JP7624810B2 - Heat detector

Info

Publication number: JP7624810B2
Application number: JP2020113270A
Authority: JP
Inventors: 聡史丸田; 政徳田村; 隆沼澤
Original assignee: Nittan Co Ltd
Current assignee: Nittan Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2025-01-31
Anticipated expiration: 2040-06-30
Also published as: JP2025063241A; JP2026012809A; JP2025063240A; JP7762819B2; JP7762818B2; JP2022011873A

Description

本発明は、熱感知素子（センサ）としてサーミスタを使用した熱感知器に関する。 The present invention relates to a heat detector that uses a thermistor as a heat sensing element (sensor).

サーミスタを使用した熱感知器は、一般に、ドーム型の筐体の中央に熱感知素子としてのサーミスタを配設し、サーミスタが下向きとなるように、筐体を建造物の天井面に取り付けて火災の発生を検出するように構成されている。
一般に、サーミスタを使用した熱感知器は、非発報状態では目立たないように、筐体（ケース）として白色を基調としたものが多い。一方、火災検出時に点灯又は点滅する作動表示灯は、例えば天井面に設置された状態で、視認性が良好となることが要求される。そのため、感知器本体（筐体）の一部に窓部を設け、その窓を通して作動表示灯の発光表示が視認できるように構成されている（例えば特許文献１）。また、砲弾型のＬＥＤ（発光ダイオード）の頭部を感知器本体の表面に直接露出させるように構成されているものもある（例えば特許文献２の図９）。 Heat detectors that use thermistors are generally configured to detect the occurrence of a fire by disposing a thermistor as a heat sensing element in the center of a dome-shaped housing and attaching the housing to the ceiling surface of a building with the thermistor facing downwards.
Generally, heat detectors using thermistors are often made with a white-based housing (case) so that they are not noticeable when they are not triggering an alarm. On the other hand, the operation indicator light that lights up or flashes when a fire is detected is required to have good visibility when installed on a ceiling surface, for example. For this reason, a window is provided in a part of the detector body (housing) so that the light-emitting display of the operation indicator light can be seen through the window (see, for example, Patent Document 1). There are also detectors that are configured so that the head of a bullet-shaped LED (light-emitting diode) is directly exposed on the surface of the detector body (see, for example, Figure 9 of Patent Document 2).

特開平１１－１７５８６０号公報Japanese Patent Application Publication No. 11-175860 特開平０８－１８０２７３号公報Japanese Patent Application Publication No. 08-180273

熱感知器が設置される天井面は白色又は白系色であることが多いため、白色を基調とした熱感知器を設置することで熱感知器を目立たなくすることができる。しかし、従来の熱感知器の多くはサーミスタとして黒色のものを使用することが多いとともに、サーミスタは、筐体の中央に下向きとなるように配設され、これを保護するようにプロテクタが設けられるとともに、熱気流をとらえやすくするため、プロテクタにはサーミスタを中心にして放射状のフィンが設けられている。そのため、従来の熱感知器は、熱感知器本体は目立たなくても、黒色のサーミスタが目立ってしまい、熱感知器が周囲の色と調和しないという課題がある。 Because the ceiling surface on which heat detectors are installed is often white or a white-based color, installing a heat detector with a white base color makes the heat detector less noticeable. However, many conventional heat detectors use black thermistors, which are placed in the center of the housing facing downwards and are provided with a protector to protect the thermistor, and the protector has radial fins centered on the thermistor to make it easier to capture hot air currents. Therefore, with conventional heat detectors, even if the heat detector itself is not noticeable, the black thermistor stands out, and there is an issue that the heat detector does not blend in with the surrounding colors.

また、従来の熱感知器は、作動表示灯の窓がプロテクタの外側の感知器本体の表面に設けられることが多いが、表示窓は比較的小さいため視認する方向によってプロテクタや黒色のサーミスタによって妨げられてしまい、視認性が良好でないという課題がある。そこで、プロテクタを透明もしくは半透明の材料で形成することも考えられるが、そのようにすると、白色を基調とする熱感知器本体の中央に材質の異なるプロテクタが設けられた構成となるため、プロテクタが目立ってしまい周囲の色調と調和しないという課題が生じる。 In addition, in conventional heat detectors, the window for the operation indicator light is often provided on the surface of the detector body outside the protector, but because the display window is relatively small, it can be obstructed by the protector or black thermistor depending on the viewing direction, resulting in poor visibility. It is therefore possible to form the protector from a transparent or translucent material, but this would result in a configuration in which a protector made of a different material is provided in the center of a heat detector body that is primarily white, creating the problem that the protector stands out and does not blend in with the surrounding colors.

本発明は上記のような課題に着目してなされたもので、その目的とするところは、熱感知素子としてサーミスタを用いている熱感知器において、サーミスタやプロテクタなどの部品が目立つことを抑止し、設置環境に馴染むようにすることにある。
本発明の他の目的は、熱感知素子としてサーミスタを用いている熱感知器において、作動表示灯の視認性を向上させることができるようにすることにある。 The present invention has been made with attention to the above-mentioned problems, and its purpose is to prevent components such as the thermistor and protector from being conspicuous in a heat detector that uses a thermistor as a heat sensing element, and to enable the detector to blend in with the installation environment.
Another object of the present invention is to improve the visibility of an operation indicator lamp in a heat detector that uses a thermistor as a heat sensing element.

上記目的を達成するため本発明は、
有底筒形の本体ケースと該本体ケースの開口側を覆う外カバー部材とからなる筐体の内部に、熱感知素子および検出回路を構成する部品が実装された回路基板が収納され、前記外カバー部材には前記熱感知素子に対応した位置に開口が形成されているとともに、外側の空気が流入可能な流入口を備え前記熱感知素子の先端が臨む空間を形成しかつ前記開口を覆うプロテクタ部が設けられている熱感知器であって、
前記熱感知素子の表面は前記外カバー部材の表面と同一系統の色で、かつ表示灯の発光色が反射しやすい色に着色されているように構成したものである。
上記のように構成された熱感知器によれば、熱感知素子の表面は前記外カバー部材の表面と同一系統の色に着色されているため、サーミスタを筐体に対して目立たず周囲環境と色の調和ができる。 In order to achieve the above object, the present invention provides
A heat detector in which a circuit board on which a heat sensing element and components constituting a detection circuit are mounted is housed inside a housing consisting of a bottomed cylindrical main body case and an outer cover member covering the opening side of the main body case, and an opening is formed in the outer cover member at a position corresponding to the heat sensing element, and a protector part is provided which has an inlet through which outside air can flow in, forms a space facing the tip of the heat sensing element, and covers the opening,
The surface of the heat sensing element is colored in the same color family as the surface of the outer cover member and in a color that easily reflects the luminous color of the indicator lamp.
In the heat detector constructed as described above, the surface of the heat sensing element is colored in the same color family as the surface of the outer cover member, so that the thermistor does not stand out against the housing and the color blends in with the surrounding environment.

ここで、望ましくは、前記筐体には、前記外カバー部材の一部より光を出射可能な作動表示灯が配設され、
前記作動表示灯より出射された光の一部が、前記熱感知素子の表面に照射されるように当該熱感知素子が配置されているように構成する。
かかる構成によれば、作動表示灯より出射された光の一部が熱感知素子の表面に照射され、熱感知素子を明るくするため、作動表示灯の視認性を向上させることができる。 Here, preferably, an operation indicator lamp capable of emitting light from a part of the outer cover member is disposed on the housing,
The heat sensing element is arranged so that a portion of the light emitted from the operation indicator lamp is irradiated onto a surface of the heat sensing element.
According to this configuration, a part of the light emitted from the operation indicator lamp is irradiated onto the surface of the heat sensing element, making the heat sensing element brighter, thereby improving the visibility of the operation indicator lamp.

さらに、望ましくは、前記作動表示灯は、前記回路基板に実装された発光素子と、透光性材料で形成され前記熱感知素子の周囲に配設された光出射部と、前記発光素子より発せられた光を前記光出射部へ誘導する導光部とを備え、
前記光出射部より出射された光の一部が前記熱感知素子の表面に照射されるように、当該熱感知素子および前記光出射部が配置されているように構成する。
かかる構成によれば、透光性材料で形成された光出射部が熱感知素子の周囲に配設されているため、光出射部から出射された光が熱感知素子へ向けて照射され、熱感知素子を明るくするため、多方向から見た作動表示灯の視認性を向上させることができる。 Further, preferably, the operation indicator lamp comprises a light-emitting element mounted on the circuit board, a light-emitting portion formed of a light-transmitting material and disposed around the heat-sensing element, and a light-guiding portion for guiding the light emitted from the light-emitting element to the light-emitting portion,
The heat sensing element and the light emitting portion are arranged so that a portion of the light emitted from the light emitting portion is irradiated onto the surface of the heat sensing element.
According to this configuration, the light emitting portion formed of a translucent material is arranged around the heat sensing element, so that the light emitted from the light emitting portion is irradiated toward the heat sensing element, brightening the heat sensing element and improving the visibility of the operation indicator light when viewed from multiple directions.

さらに、望ましくは、前記光出射部は、前記熱感知素子の径よりも内径の大きな挿通用円筒部および該挿通用円筒部の前記回路基板の側から当該回路基板から遠ざかる方向へ広がるすり鉢状部を備えた内カバーにより構成され、前記内カバーは前記挿通用円筒部内に前記熱感知素子の基部が位置するように配設され、前記すり鉢状部が前記外カバー部材の開口に対応するように配置され、
前記すり鉢状部又はすり鉢状部外側の鍔部より出射された光の一部が前記熱感知素子の表面に照射されるように構成する。
かかる構成によれば、内カバーにより熱感知素子を保護しつつ、内カバーのすり鉢状部より出射された光の一部が熱感知素子の表面に照射され、熱感知素子を明るくするため、作動表示灯の視認性を向上させることができる。 Further, preferably, the light emitting portion is configured by an inner cover having a cylindrical insertion portion having an inner diameter larger than a diameter of the heat sensing element and a cone-shaped portion expanding from the circuit board side of the cylindrical insertion portion in a direction away from the circuit board, the inner cover is disposed so that a base of the heat sensing element is located within the cylindrical insertion portion, and the cone-shaped portion is disposed so as to correspond to an opening of the outer cover member,
The structure is such that a part of the light emitted from the mortar-shaped portion or the flange portion on the outer side of the mortar-shaped portion is irradiated onto the surface of the heat sensing element.
With this configuration, while the heat sensing element is protected by the inner cover, some of the light emitted from the funnel-shaped portion of the inner cover is irradiated onto the surface of the heat sensing element, brightening the heat sensing element and improving the visibility of the operation indicator light.

さらに、望ましくは、前記すり鉢状部の表面または裏面の一部には、前記外カバー部材の表面と同一系統の色の被膜が設けられているように構成する。
かかる構成によれば、内カバーを筐体に対して目立たないようにすることができる。 Furthermore, it is preferable that a part of the front or back surface of the funnel-shaped portion is provided with a coating of the same color as the surface of the outer cover member.
With this configuration, the inner cover can be made less noticeable compared to the housing.

また、望ましくは、前記すり鉢状部は透明材料で形成されており、前記回路基板の前記熱感知素子の実装側の面は前記外カバー部材の表面と同一系統の色に着色されているように構成する。
かかる構成によれば、すり鉢状部は透明材料で形成されていてすり鉢状部を透して回路基板が見えてしまう場合に、回路基板を筐体に対して目立たないようにすることができる。 Also, preferably, the cone-shaped portion is made of a transparent material, and the surface of the circuit board on which the heat-sensing element is mounted is colored in the same color scheme as the surface of the outer cover member.
According to this configuration, even if the cone-shaped portion is made of a transparent material and the circuit board can be seen through the cone-shaped portion, the circuit board can be made to be less noticeable against the housing.

さらに、望ましくは、前記熱感知素子の表面は梨地仕上げ面に形成されているように構成する。
かかる構成によれば、熱感知素子の表面は梨地仕上げ面であるため、熱感知素子の表面に照射された光が乱反射することで、熱感知素子をより明るくするため、作動表示灯の視認性をさらに向上させることができる。 Furthermore, it is preferable that the surface of the heat sensing element is formed into a matte finish.
With this configuration, the surface of the heat sensing element has a matte finish, so that the light irradiated onto the surface of the heat sensing element is diffusely reflected, making the heat sensing element brighter, thereby further improving the visibility of the operation indicator light.

また、望ましくは、前記外カバー部材は非透光性材料で形成され、前記プロテクタ部は前記外カバー部材とは異なる白濁色又は構造的に光を反射可能な加工を施した透光性材料で形成されており、
前記作動表示灯は、前記回路基板に実装された発光素子と前記プロテクタ部とにより構成され、前記発光素子より発せられた光が前記プロテクタ部へ誘導されることにより当該プロテクタ部が発光可能にされ、
前記プロテクタ部より出射された光の一部が前記熱感知素子の表面に照射されるように、前記プロテクタ部および前記熱感知素子が配置されているように構成する。 Also, preferably, the outer cover member is formed of a non-translucent material, and the protector portion is formed of a translucent material that is a cloudy white color different from the outer cover member or that has been structurally processed to be able to reflect light,
the operation indicator lamp is configured with a light-emitting element mounted on the circuit board and the protector section, and light emitted from the light-emitting element is guided to the protector section, thereby enabling the protector section to emit light;
The protector section and the heat sensing element are arranged so that a portion of the light emitted from the protector section is irradiated onto the surface of the heat sensing element.

上記のような構成によれば、プロテクタ部が作動表示灯の光出射部として機能するため別途光出射部を設ける必要がないとともに、プロテクタ部が白濁色又は構造的に光を反射可能な加工を施した透光性材料で形成されているため、作動表示灯の消灯中はプロテクタ部を筐体に対して目立たないようにすることができる。 With the above configuration, the protector portion functions as the light emitting portion of the operation indicator light, eliminating the need to provide a separate light emitting portion, and since the protector portion is made of a translucent material that is opaque in color or has been structurally processed to be able to reflect light, the protector portion can be made inconspicuous against the housing when the operation indicator light is off.

本発明に係る熱感知器によれば、サーミスタやプロテクタなどの部品をサーミスタやプロテクタなどの部品を設置環境の中で目立たないようにすることができる。また、作動表示灯の視認性を向上させることができるという効果がある。 The heat detector of the present invention makes it possible to make components such as thermistors and protectors less noticeable in the installation environment. It also has the effect of improving the visibility of the operation indicator light.

本発明に係る熱感知器の一実施形態を示すもので、（Ａ）は正面断面図、（Ｂ）は斜視図である。1A and 1B show an embodiment of a heat detector according to the present invention, in which FIG. （Ａ）は図１の実施形態の熱感知器の第１の変形例を示す正面断面図、（Ｂ）は第２の変形例を示す正面断面図である。1A is a front sectional view showing a first modified example of the heat detector of the embodiment in FIG. 1, and FIG. 本発明に係る熱感知器の他の実施形態を示す正面断面図である。FIG. 4 is a front cross-sectional view showing another embodiment of a heat detector according to the present invention. 内カバーの他の構成例を示すもので、（Ａ）は正面断面図、（Ｂ）は底面図、（Ｃ）は変形例を示す断面図である。11A and 11B show another example of the configuration of the inner cover, where (A) is a front cross-sectional view, (B) is a bottom view, and (C) is a cross-sectional view showing a modified example. 内カバーのさらに他の構成例を示すもので、（Ａ）は正面断面図、（Ｂ）は底面図である。13A and 13B show still another example of the inner cover, in which FIG. 13A is a front cross-sectional view and FIG.

以下、図面を参照しながら、本発明に係る熱感知器の一実施形態について説明する。図１は露出型の熱感知器であり、図１（Ａ）には実施形態の熱感知器の正面断面図が、図１（Ｂ）には実施形態の熱感知器の斜視図が示されている。
図１に示す実施形態においては、施工例として多い天井面や壁面が白色の場合について、感知器外観を白色とした場合を説明する。また、作動表示灯は赤色発光とする。
本実施形態の熱感知器１０は、熱感知素子としてサーミスタを用い火災に伴い発生した熱によって熱せられた空気がサーミスタに接触することで生じる電気抵抗の変化を検出して火災を検知可能な感知器であり、建造物の天井面などに設置されて使用されるように構成されている。 Hereinafter, an embodiment of a heat detector according to the present invention will be described with reference to the drawings. Fig. 1 shows an exposed type heat detector, and Fig. 1(A) shows a front cross-sectional view of the heat detector of the embodiment, and Fig. 1(B) shows a perspective view of the heat detector of the embodiment.
In the embodiment shown in Fig. 1, a case will be described in which the exterior of the detector is white, since the ceiling or wall surfaces are often white, and the operation indicator light emits red light.
The heat detector 10 of this embodiment is a detector that uses a thermistor as a heat sensing element and can detect a fire by detecting a change in electrical resistance that occurs when air heated by the heat generated by a fire comes into contact with the thermistor, and is configured to be installed and used on the ceiling surface of a building, etc.

本実施形態の熱感知器１０は、図１（Ａ）に示すように、熱を感知する部品を収容するための収容凹部１１Ａを有し建造物の天井面に取り付けているベース部材に結合可能な有底筒形の本体ケース１１と、中央にサーミスタの先端部を覆うプロテクタ部を有し前記本体ケース１１の開口側全体を覆う外カバー１２と、該外カバー１２の周縁部を覆いつつ天井面の取り付けネジや配線を隠すための化粧カバー１３とを備え、本体ケース１１と外カバー１２とにより内部に収容空間を有する筐体が形成される。 As shown in FIG. 1(A), the heat detector 10 of this embodiment comprises a cylindrical main case 11 with a bottom that has a recess 11A for accommodating heat-sensing components and can be connected to a base member attached to the ceiling surface of a building, an outer cover 12 that has a protector in the center that covers the tip of the thermistor and covers the entire opening side of the main case 11, and a decorative cover 13 that covers the periphery of the outer cover 12 and hides the mounting screws and wiring on the ceiling surface, and the main case 11 and the outer cover 12 form a housing with an internal storage space.

また、本実施形態の熱感知器１０は、前記本体ケース１１の収容凹部１１Ａ内に収容された回路基板１４と、該回路基板１４に実装されたサーミスタ１５と、該サーミスタ１５が挿通可能な挿通孔を有し上端が上記回路基板１４の表面に接するように配設された円筒部１６ａと該円筒部１６ａから下方へ向かって広がるすり鉢状部１６ｂとすり鉢状部１６ｂの下端に設けられた鍔部１６ｃとを有する内カバー１６を備える。 The heat detector 10 of this embodiment also includes a circuit board 14 accommodated in the accommodation recess 11A of the main body case 11, a thermistor 15 mounted on the circuit board 14, and an inner cover 16 having a cylindrical portion 16a with an insertion hole through which the thermistor 15 can be inserted and arranged so that its upper end is in contact with the surface of the circuit board 14, a cone-shaped portion 16b that spreads downward from the cylindrical portion 16a, and a flange portion 16c provided at the lower end of the cone-shaped portion 16b.

上記回路基板１４は、上面および下面に火災感知のための電子回路を構成する抵抗や容量、ＩＣ（半導体集積回路）などの電子部品２０が実装されるプリント配線基板により構成され、回路基板１４のほぼ中央にサーミスタ１５のリード端子の先端が回路基板１４を貫通して反対側の面より突出し、フロー半田付け等によって接続される。
また、本実施形態の熱感知器においては、外カバー１２と化粧カバー１３が白色の樹脂で形成されているとともに、サーミスタ１５として、表面に白色のエポキシ樹脂等の塗料が塗布されたものが使用されている。
この実施形態におけるサーミスタ１５への着色は、作動表示灯が異常を表す赤色で発光した際に、赤色を充分反射する色として白を選択しているが、白に限られるものではなく、赤色光を充分反射し視認できる系統の色であればよい。
なお、本実施例では、感知器が天井等に設置された際に視認される感知器表面部を外カバーと表現し、上記外カバー１２と化粧カバー１３、プロテクタ１２Ｃを総称して外カバー部材という。 The circuit board 14 is composed of a printed wiring board on whose top and bottom surfaces electronic components 20 such as resistors, capacitors, and ICs (semiconductor integrated circuits) that constitute an electronic circuit for fire detection are mounted, and the tips of the lead terminals of the thermistor 15 penetrate the circuit board 14 at approximately the center of the circuit board 14 and protrude from the opposite surface, and are connected by flow soldering or the like.
In addition, in the heat detector of this embodiment, the outer cover 12 and the decorative cover 13 are formed from white resin, and the thermistor 15 used has a surface coated with white paint such as epoxy resin.
In this embodiment, the color of thermistor 15 is selected to be white as a color that sufficiently reflects red when the operation indicator light emits red light to indicate an abnormality. However, the color is not limited to white, and any color that sufficiently reflects red light and is visible can be used.
In this embodiment, the surface portion of the sensor that is visible when the sensor is installed on a ceiling or the like is referred to as the outer cover, and the outer cover 12, the decorative cover 13, and the protector 12C are collectively referred to as the outer cover members.

一方、外カバー１２には、その中央に、上記内カバー１６の鍔部１６ｃに少なくとも１部が当接する（重なる形で当接）円形状の開口部１２Ａが形成されているとともに、上記内カバー１６の下方に位置するリング状のヘッド部１２Ｂが設けられ、該ヘッド部１２Ｂの近傍まで上記サーミスタ１５の頭部が達するように、サーミスタ１５が配設されている。
さらに、上記リング状ヘッド部１２Ｂと外カバー１２との間に、図１（Ｂ）に示すように、放射状に配設された柱状の隔壁１２Ｃが複数個（例えば６個）形成され、これらの隔壁１２Ｃ間に外部の空気をケース内部に流入可能にする流入口として機能する開口が設けられている。ヘッド部１２Ｂと隔壁１２Ｃとによってプロテクタ部が構成される。上記隔壁１２Ｃは板状でも良い。 On the other hand, the outer cover 12 has a circular opening 12A in its center, at least a portion of which abuts (abuts in an overlapping manner) against the flange portion 16c of the inner cover 16, and is provided with a ring-shaped head portion 12B located below the inner cover 16, and the thermistor 15 is arranged so that the head of the thermistor 15 reaches close to the head portion 12B.
1B, a plurality of (e.g., six) columnar partition walls 12C are formed radially between the ring-shaped head portion 12B and the outer cover 12, and openings functioning as inlets that allow outside air to flow into the case are provided between the partition walls 12C. The head portion 12B and the partition walls 12C form a protector portion. The partition walls 12C may be plate-shaped.

また、本実施形態の熱感知器においては、すり鉢状部１６ｂを有する内カバー１６がポリカーボネート樹脂等の透光性材料で形成されているとともに、この内カバー１６の鍔部１６ｃに対応する位置に、動作状態報知用のＬＥＤ（発光ダイオード）１７が実装されている。このＬＥＤ１７には、筐体と異なる色（例えば赤）の光を発するものが使用されている。そして、内カバー１６の鍔部１６ｃ裏面のＬＥＤ１７と対向する部位には、凹部からなる導光部１６ｅが設けられている。 In the heat detector of this embodiment, the inner cover 16 having the cone-shaped portion 16b is made of a translucent material such as polycarbonate resin, and an LED (light-emitting diode) 17 for indicating the operating state is mounted at a position corresponding to the flange portion 16c of this inner cover 16. This LED 17 emits light of a color different from the housing (e.g. red). A light-guiding portion 16e consisting of a recess is provided at a portion facing the LED 17 on the back surface of the flange portion 16c of the inner cover 16.

また、内カバー１６の鍔部１６ｃ裏面のＬＥＤ１７と対向する部位には、凹部からなる導光部１６ｅが設けられている。また、鍔部には、導光部１６ｅと反対側の面（図では下面）に光反射部１６ｆが設けられている。光反射部１６ｆは、側方から見たときに断面がＶ字をなす凹部（溝）で構成されており、導光部１６ｅから入光したＬＥＤ１７の光は光反射部１６ｆで反射され、内カバー１６のすり鉢状部１６ｂ全体へ誘導され、すり鉢状部１６ｂから光が出射され、感知器が作動中であることを表示することができるようになっている。なお、ＬＥＤ１７は１個に限定されず、２個以上であっても良い。 A light guide 16e made of a recess is provided on the rear surface of the flange 16c of the inner cover 16 facing the LED 17. A light reflector 16f is provided on the surface of the flange opposite the light guide 16e (the bottom surface in the figure). The light reflector 16f is configured as a recess (groove) with a V-shaped cross section when viewed from the side, and the light from the LED 17 that enters from the light guide 16e is reflected by the light reflector 16f and guided to the entire cone-shaped portion 16b of the inner cover 16, from which the light is emitted, thereby indicating that the sensor is in operation. The number of LEDs 17 is not limited to one, and may be two or more.

さらに、本実施形態の熱感知器では、内カバー１６のすり鉢状部１６ｂ及び鍔部１６ｃから出射した光が中央の白色のサーミスタ１５の表面に当たって反射することで、サーミスタ１５も表示部として機能することができ、見かけ上の発光表示の面積を大きくしたり、視認可能な方向を広げたりすることができる。
具体的には、サーミスタ１５が一般的な黒色の場合、サーミスタ１５によって内カバー１６のすり鉢状部１６ｂの一部分が隠されるとともにサーミスタ１５に当たった作動表示灯の光は吸収されて光量が減少してしまうこととなるが、サーミスタ１５の表面が白色等表示灯の発光色が反射しやすい色であると、すり鉢状部１６ｂから出射した光がサーミスタ１５の表面に当たって反射するため光量の減少が回避され、発光状態が見え易くなる。なお、サーミスタ１５の表面は、光沢のある仕上げではなく梨地仕上げ(乱反射する加工)とするのが良い。これにより、すり鉢状部１６ｂ及び鍔部１６ｃからの光をサーミスタ１５の表面で乱反射させて、発光状態をより見え易くすることができる。 Furthermore, in the heat detector of this embodiment, light emitted from the funnel-shaped portion 16b and flange portion 16c of the inner cover 16 hits the surface of the central white thermistor 15 and is reflected, allowing the thermistor 15 to also function as a display, thereby increasing the apparent area of the light-emitting display and widening the visible direction.
Specifically, if the thermistor 15 is a typical black color, it will hide part of the cone-shaped portion 16b of the inner cover 16 and absorb the light of the operation indicator that hits the thermistor 15, reducing the amount of light, but if the surface of the thermistor 15 is a color that easily reflects the light emitted by the indicator, such as white, the light emitted from the cone-shaped portion 16b will hit the surface of the thermistor 15 and be reflected, preventing a reduction in the amount of light and making the light-emitting state easier to see. It is preferable that the surface of the thermistor 15 be given a matte finish (a process that causes diffuse reflection) rather than a glossy finish. This allows the light from the cone-shaped portion 16b and the flange portion 16c to be diffusely reflected by the surface of the thermistor 15, making the light-emitting state easier to see.

さらに、本実施形態の熱感知器においては、内カバー１６の円筒部１６ａの内側に樹脂１９を充填した構造を採用している。これにより、天井面に形成された配線等を通す穴から筐体内（本体ケース１１内側の基板収納空間）に圧力の高い空気が入り込み、その高圧の空気が内カバー１６の円筒部１６ａとサーミスタ１５との隙間から流れ出すことで、サーミスタ１５の周囲に円筒状の気流層が生じ、その気流によってサーミスタ１５に熱気流の流入が阻害されたり、サーミスタ１５に水が付着し、埃が堆積し易くなって熱感知機能が低下するのを防止することができる。また、充填する樹脂１９として白色の樹脂を使用することで、円筒部１６ａの内側の色(例えば、基板表面の色)が外部から視認する際に樹脂で覆い隠される。
なお、内カバー１６は、図２（Ａ）に示すように、円筒部１６ａを長くしてすり鉢状部１６ｂをなくし、円筒部１６ａに鍔部１６ｃを直結させた形状であっても良い。 Furthermore, in the heat detector of this embodiment, a structure is adopted in which the inside of the cylindrical portion 16a of the inner cover 16 is filled with resin 19. As a result, high-pressure air enters the housing (the board storage space inside the main body case 11) from a hole formed in the ceiling surface through which wiring and the like passes, and the high-pressure air flows out from the gap between the cylindrical portion 16a of the inner cover 16 and the thermistor 15, creating a cylindrical airflow layer around the thermistor 15, which prevents the inflow of hot air to the thermistor 15 from being obstructed by the airflow, or prevents water from adhering to the thermistor 15, which makes it easier for dust to accumulate and reduces the heat detection function. In addition, by using a white resin as the filling resin 19, the color of the inside of the cylindrical portion 16a (for example, the color of the board surface) is covered by the resin when viewed from the outside.
As shown in FIG. 2A, the inner cover 16 may have a shape in which the cylindrical portion 16a is elongated, the cone-shaped portion 16b is eliminated, and the flange portion 16c is directly connected to the cylindrical portion 16a.

また、ＬＥＤ１７を内カバー１６の鍔部１６ｃに対向させる代わりに、図２（Ｂ）に示すように、外カバー１２の平面部に作動表示灯の窓（丸窓）を設けてその窓より砲弾型のＬＥＤ１７の頭部を露出させるように構成しても良い。このように砲弾型のＬＥＤ１７を配設するとともに、ＬＥＤ１７より出射され頭部の凸レンズで広がる光の光路内に白色のサーミスタ１５が入るようにサーミスタ１５の高さを設定することで、サーミスタ１５の表面でＬＥＤ１７からの光を反射して作動表示灯の一部として機能させることができる。なお、砲弾型ＬＥＤ１７の頭部を外カバー１２の平面部より突出させる代わりに、外カバー１２の作動表示用の窓に平面あるいは凸状のレンズを設けても良い。窓が平面の場合には、光の広がり角度が小さいが、凸レンズを設けることで、光の広がり角度を大きくすることができ、サーミスタ１５の高さが低くても反射させることができる。 In addition, instead of facing the LED 17 to the flange 16c of the inner cover 16, as shown in FIG. 2(B), a window (round window) for the operation indicator light may be provided on the flat surface of the outer cover 12, and the head of the bullet-shaped LED 17 may be exposed from the window. By disposing the bullet-shaped LED 17 in this manner and setting the height of the thermistor 15 so that the white thermistor 15 is within the optical path of the light emitted from the LED 17 and spread by the convex lens of the head, the light from the LED 17 can be reflected on the surface of the thermistor 15 to function as part of the operation indicator light. Note that instead of protruding the head of the bullet-shaped LED 17 from the flat surface of the outer cover 12, a flat or convex lens may be provided in the window for operation indication of the outer cover 12. When the window is flat, the spread angle of the light is small, but by providing a convex lens, the spread angle of the light can be increased, and the thermistor 15 can be reflected even if its height is low.

また、回路基板１４の表面（図１では下面）に、白色のレジストや絶縁性塗料を塗布、あるいは白色のシルク印刷を行っても良い。同様に実装部品２０の表面を白色に塗っても良い。内カバー１６の透光性材料の透明度が高い場合、内カバー１６越しに回路基板１４や実装部品が透けて外カバー１２の開口部から基板表面の色が透けて見えたり、開口部が黒っぽく見えたりしまうが、回路基板１４及び実装部品２０の表面を白色に着色することで、外カバー１２の開口部を明るくし、感知器全体が白色で統一されているように見せることができる。なお、この際は後述するように透光性材料に発報時にＬＥＤからの光を導き周囲に拡散できる微細構造の加工が利用できる。 Also, the surface of the circuit board 14 (the underside in FIG. 1) may be coated with a white resist or insulating paint, or may be silk-screened in white. Similarly, the surfaces of the mounted components 20 may be painted white. If the translucent material of the inner cover 16 is highly transparent, the circuit board 14 and mounted components may be visible through the inner cover 16, and the color of the board surface may be visible through the opening of the outer cover 12, or the opening may appear black. However, by coloring the surfaces of the circuit board 14 and mounted components 20 white, the opening of the outer cover 12 can be brightened, and the entire sensor may appear uniformly white. In this case, as described below, it is possible to use a microstructure processing that can guide the light from the LED to the translucent material when an alarm is activated and diffuse it to the surroundings.

次に、図３を用いて、熱感知器の他の実施形態を説明する。
図３は埋め込み型の熱感知器であり、本実施形態の熱感知器１０は、図１に示す実施形態の露出型の熱感知器１０における化粧カバー１３がなく、有底円筒形の本体ケース１１と、中央にサーミスタの先端部を覆うプロテクタ部を有し前記本体ケース１１の開口側全体を覆う外カバー１２と、本体ケース１１と外カバー１２とにより内部に収容空間を有する筐体が形成され、筐体内に円筒部１６ａとすり鉢状部１６ｂと鍔部１６ｃを有しサーミスタ１５を保護する内カバー１６が収納されている。 Next, another embodiment of the heat detector will be described with reference to FIG.
Figure 3 shows an embedded type heat detector, and the heat detector 10 of this embodiment does not have the decorative cover 13 of the exposed type heat detector 10 of the embodiment shown in Figure 1, and instead has a cylindrical main body case 11 with a bottom, an outer cover 12 which has a protector part in the center that covers the tip of the thermistor and covers the entire opening side of the main body case 11, and the main body case 11 and outer cover 12 form a housing having an internal storage space, and an inner cover 16 which has a cylindrical part 16a, a funnel-shaped part 16b and a flange part 16c and protects the thermistor 15 is housed within the housing.

この実施形態の熱感知器も、外カバー１２が白色の樹脂で形成されているとともに、回路基板１４に実装されたサーミスタ１５として、表面に白色のエポキシ樹脂等の塗料が塗布されたものが使用されている例として説明する。
また、内カバー１６は透光性材料で形成され、鍔部１６ｃには回路基板１４へ向かって突出する円柱状の導光部１６ｅが形成され、この導光部１６ｅの端面に対向するように、回路基板１４に高さの低いＬＥＤチップ１７が面実装されており、ＬＥＤチップ１７から出射された光は導光部１６ｅを通って内カバー１６の鍔部１６ｃに誘導され、そこに形成されている光反射部１６ｆで反射され、内カバー１６のすり鉢状部１６ｂ全体へ誘導され、すり鉢状部１６ｂから光を出射し、感知器が作動中であることを表示することができるようになっている。 The heat detector of this embodiment is also described as an example in which the outer cover 12 is formed from white resin, and the thermistor 15 mounted on the circuit board 14 has a surface coated with white paint such as epoxy resin.
In addition, the inner cover 16 is formed from a light-transmitting material, and a cylindrical light-guiding section 16e that protrudes toward the circuit board 14 is formed on the flange 16c. A low-height LED chip 17 is surface-mounted on the circuit board 14 so as to face the end face of this light-guiding section 16e. Light emitted from the LED chip 17 passes through the light-guiding section 16e and is guided to the flange 16c of the inner cover 16, reflected by the light-reflecting section 16f formed there, and guided to the entire funnel-shaped section 16b of the inner cover 16. Light is emitted from the funnel-shaped section 16b, making it possible to indicate that the sensor is activated.

また、内カバー１６には、すり鉢状部１６ｂから鉛直方向上方へ向かって突出するように形成された３本の係止片１６ｄが設けられている（図３には、３本の係止片１６ｄのうち１本が示されている）。係止片１６ｄの先端には爪部が形成されており、この爪部が、回路基板１４に形成されている係合穴１４ａに係合されることで、内カバー１６が回路基板１４に結合されている。係止片１６ｄは、３本が必須ではなく、２本でもよい。また、係止片１６ｄは、すり鉢状部１６ｂではなく、鍔部１６ｃに設けられていても良い。
さらに、本実施形態の熱感知器においても、内カバー１６の円筒部１６ａの内側に樹脂１９が充填され、サーミスタ１５の熱感知機能が低下するのを防止している。充填される樹脂は、白色系またはそれ以外の色でも良いが、筐体色が白の場合は樹脂も白が望ましい。また、天井等周囲環境の色が白色系以外の色の場合、充填される樹脂の表面に白色系の塗料を塗布しても良い。その場合は、筐体の色も合わせる。 The inner cover 16 is provided with three locking pieces 16d formed to protrude vertically upward from the cone-shaped portion 16b (one of the three locking pieces 16d is shown in FIG. 3). A claw portion is formed at the tip of each locking piece 16d, and the inner cover 16 is joined to the circuit board 14 by engaging this claw portion with an engagement hole 14a formed in the circuit board 14. The number of locking pieces 16d is not necessarily three, and two may be used. The locking piece 16d may be provided on the flange portion 16c instead of on the cone-shaped portion 16b.
Furthermore, in the heat detector of this embodiment, resin 19 is filled inside cylindrical portion 16a of inner cover 16 to prevent the heat detection function of the thermistor 15 from deteriorating. The filled resin may be white or another color, but if the color of the case is white, the resin is preferably white. Also, if the color of the surrounding environment, such as the ceiling, is a color other than white, a white paint may be applied to the surface of the filled resin. In that case, the color of the case should also be matched.

また、回路基板１４の表面（図３では下面）に、白色のレジストや絶縁性塗料を塗布したり、あるいは白色のシルク印刷をしても良い。同様に実装部品２０の表面を白色に塗っても良い。内カバー１６の透光性材料の透明度が高い場合、内カバー１６越しに回路基板１４や実装部品が透けて外カバー１２の開口部から基板表面の色が透けて見えたり、開口部が黒っぽく見えたりしてしまうが、回路基板１４及び実装部品の表面を白色に着色することで、外カバー１２の開口部を明るくし、感知器全体が白色で統一されているように見せることができる。 Also, the surface of the circuit board 14 (the underside in FIG. 3) may be coated with a white resist or insulating paint, or may be silk-screened in white. Similarly, the surfaces of the mounted components 20 may be painted white. If the translucent material of the inner cover 16 is highly transparent, the circuit board 14 and mounted components may be visible through the inner cover 16, and the color of the board surface may be visible through the opening in the outer cover 12, or the opening may appear dark. However, by coloring the surfaces of the circuit board 14 and mounted components white, the opening in the outer cover 12 can be brightened, and the entire sensor appears to be uniformly white.

次に、図４および図５を用いて、図１及び図３の実施形態で説明した上記内カバー１６の他の構成例について説明する。このうち、図４の内カバー１６は、すり鉢状部１６ｂの表面の外周縁を除いた部位に白色の塗料を塗布して被膜１８を形成したものである。なお、図４の（Ａ）は内カバー１６の断面図、（Ｂ）は内カバー１６の底面図である。
この実施例においては、円柱状の導光部１６ｅより入射されたＬＥＤの光は、光反射部１６ｆで反射されて鍔部１６ｃに沿って水平方向へ広がり、内カバー１６のすり鉢状部１６ｂの表面の被膜１８の外側の円環状部分Ｒから出射されるように構成されている。なお、光反射部１６ｆは、図４（Ｂ）において矢印Ｃ方向から見たときに断面がＶ字をなす溝として形成されている。 Next, other configuration examples of the inner cover 16 described in the embodiment of Figures 1 and 3 will be described with reference to Figures 4 and 5. Of these, the inner cover 16 in Figure 4 is formed by applying a white paint to the surface of the cone-shaped portion 16b except for the outer periphery to form a coating 18. Figure 4 (A) is a cross-sectional view of the inner cover 16, and (B) is a bottom view of the inner cover 16.
In this embodiment, LED light incident through cylindrical light guiding portion 16e is reflected by light reflecting portion 16f and spreads horizontally along flange portion 16c, and is configured to be emitted from outer annular portion R of coating 18 on the surface of bowl-shaped portion 16b of inner cover 16. Light reflecting portion 16f is formed as a groove having a V-shaped cross section when viewed from the direction of arrow C in Fig. 4(B).

本実施例を適用した感知器においては、上記円環状部分から出射した光が、プロテクタ部の柱の隙間から外部へ広がるとともに、一部は白色のサーミスタ１５の表面に照射されて反射する。これにより、作動表示灯の点灯状態を視認させ易くすることができる。
なお、白色の被膜１８は、すり鉢状部１６ｂの表面でなく裏面に形成しても良いし、塗料を塗布して形成する代わりに白色のフィルムを貼り付けても良い。その際、内カバー１６の円筒部１６ａの内側に充填された樹脂１９の表面にも白い被膜を同時に形成してもよい。また、充填される樹脂としては、白色と白濁色の２色樹脂成型又は、白色と透明の２色樹脂成型で形成してもよい。また、被膜１８は白色に限定されず、白色系であれば良い。また、白色系の被膜１８を形成する代わりに、内部を誘導されてきた光を反射可能な構造（例えば多数の微細な溝）の加工を施すようにしても良い。
すり鉢状部１６ｂの裏面に白い被膜を形成した場合、監視時（作動表示灯消灯時）は、白色に視認されるが、発報時（作動表示灯点灯時）は、すり鉢状部の内側全体からＬＥＤの光が放出されることとなり、サーミスタ１５に充分な光の照射ができることになり、作動表示の際に白色のサーミスタの反射で視認性が良い状態を作り出すことができる。 In a sensor to which this embodiment is applied, the light emitted from the annular portion spreads to the outside through the gaps in the pillars of the protector, and part of the light is irradiated and reflected by the surface of the white thermistor 15. This makes it easier to visually confirm the lighting state of the operation indicator light.
The white coating 18 may be formed on the reverse side of the mortar-shaped portion 16b instead of on the front side, or a white film may be attached instead of applying paint. In this case, a white coating may also be formed on the surface of the resin 19 filled inside the cylindrical portion 16a of the inner cover 16 at the same time. The resin to be filled may be formed by two-color resin molding of white and opaque white, or two-color resin molding of white and transparent. The coating 18 is not limited to white, and may be any color based on white. Instead of forming a white coating 18, a structure capable of reflecting light guided inside (e.g., a large number of fine grooves) may be processed.
If a white coating is formed on the underside of the funnel-shaped portion 16b, it will appear white during monitoring (when the operation indicator light is off), but when an alarm is issued (when the operation indicator light is on), the LED light will be emitted from the entire inside of the funnel-shaped portion, allowing sufficient light to be irradiated onto the thermistor 15, and the reflection of the white thermistor will create a condition with good visibility when the operation is indicated.

また、図４（Ａ）に点線で示すように、外カバー１２の開口部１２Ａの径を、内カバー１６の鍔部１６ｃの内径よりも大きく形成することで、鍔部１６ｃの内側の一部を露出させて、この円環状の部分からＬＥＤの光を出射させるように構成してもよい。その際、開口部１２Ａの内側の鍔部１６ｃの平面部分に凸状部を形成することで、内カバー１６から白色のサーミスタ１５の表面へ光を出射できる面積を増やし、ＬＥＤ１７の光を白色のサーミスタ１５の表面に確実に照射して反射させることができる。
なお、上記で説明した、すり鉢状部１６ｂの表面の白い被膜と裏面の白い被膜を同時に形成してもよい。この場合、透光性材料の内カバー１６内を伝達される光が内カバー１６から外部に放出される面積を絞ることができ、作動表示灯としての光量を充分得ることができる。
また、図４（Ｃ）に示すように、内カバー１６を回路基板１４へ止着するための係止片１６ｄは、すり鉢状部１６ｂではなく鍔部１６ｃに設けても良い。また、ＬＥＤ１７の光を集光し易くするため、導光部１６ｅの端面を凹面状に形成しても良い。 4(A), the diameter of the opening 12A of the outer cover 12 may be made larger than the inner diameter of the flange 16c of the inner cover 16, exposing a part of the inside of the flange 16c and allowing the light of the LED to exit from this annular portion. In this case, by forming a convex portion on the flat portion of the flange 16c on the inside of the opening 12A, the area through which light can be emitted from the inner cover 16 to the surface of the white thermistor 15 is increased, and the light of the LED 17 can be reliably irradiated to and reflected by the surface of the white thermistor 15.
As described above, the white coating on the front surface and the white coating on the back surface of the cone-shaped portion 16b may be formed at the same time. In this case, the area over which the light transmitted through the inner cover 16 made of a light-transmitting material is emitted to the outside from the inner cover 16 can be narrowed, and a sufficient amount of light can be obtained as an operation indicator lamp.
4C, the locking piece 16d for fastening the inner cover 16 to the circuit board 14 may be provided on the flange portion 16c instead of the cone-shaped portion 16b. Also, in order to make it easier to collect the light of the LEDs 17, the end face of the light-guiding portion 16e may be formed into a concave shape.

図５に示す内カバー１６は、鍔部１６ｃの外周縁に沿って下向きに突出するリブ状の出光部１６ｇが設けられている点で、図４に示す実施例の内カバー１６と相異している。
また、出光部１６ｇを設けたのに伴い、導光部１６ｅに対応して鍔部１６ｃの表面部に形成されている光反射部１６ｆが、導光部１６ｅからの光を外側すなわち出光部１６ｇへも反射するように、鉛直方向に断面した場合にもＶ字をなすように形成されている点でも図４の実施例の内カバー１６と相異している。 The inner cover 16 shown in FIG. 5 differs from the inner cover 16 of the embodiment shown in FIG. 4 in that a rib-like light-emitting portion 16g that protrudes downward is provided along the outer periphery of the flange portion 16c.
In addition, due to the provision of light exit portion 16g, light reflecting portion 16f formed on the surface of flange portion 16c corresponding to light guiding portion 16e is formed so as to form a V shape when cross-sectioned in the vertical direction so as to reflect light from light guiding portion 16e to the outside, i.e., light exit portion 16g, which differs from the inner cover 16 of the embodiment in Figure 4.

上記出光部１６ｇは、下方から見た場合、図５（Ｂ）に示すように、リング状をなしている。なお、光反射部１６ｆは、図４の実施例と同様、図５（Ｂ）において矢印Ｃ方向から見たときにも断面がＶ字をなす溝として形成されている。
さらに、鍔部１６ｃの外周縁に沿って下向きに突出するリブ状の出光部１６ｇを設けたのに伴い、外カバー１２には、図５（Ａ）に示すように、スリット１２ｅが形成され、このスリット１２ｅに上記出光部１６ｇが嵌合され、その頭部が外カバー１２の表面に臨むように構成されている。スリット１２ｅは、出光部１６ｇに対応して、平面視でリング状をなす。 The light exit portion 16g has a ring shape when viewed from below, as shown in Fig. 5(B). The light reflecting portion 16f is formed as a groove having a V-shaped cross section when viewed from the direction of the arrow C in Fig. 5(B), similar to the embodiment in Fig. 4.
Furthermore, in association with the provision of a rib-like light-emitting portion 16g that protrudes downward along the outer peripheral edge of the flange portion 16c, a slit 12e is formed in the outer cover 12 as shown in Fig. 5(A), and the light-emitting portion 16g is fitted into this slit 12e so that its head faces the surface of the outer cover 12. The slit 12e has a ring shape in a plan view corresponding to the light-emitting portion 16g.

また、出光部１６ｇの頭部は、図５（Ａ）に示すように、下方へ向かって膨らむ形状をなすように形成されており、レンズ効果で出光部１６ｇから光が広がりつつ出射されるようになっている。そして、内側へ向かった光の一部は、内カバー１６の内側に配設される表面が白色のサーミスタ１５に照射されて反射する。なお、図５の内カバー１６は、出光部１６ｇの位置がプロテクタ部を構成する柱状の隔壁１２Ｃの外側に位置することとなるが、隔壁１２Ｃと重なる位置あるいは内側に位置するように形成しても良い。また、出光部１６ｇの頭部を膨らませる代わりに平坦な面にしても良い。 As shown in FIG. 5(A), the head of the light output section 16g is formed to bulge downward, and the light is emitted from the light output section 16g while spreading out due to the lens effect. Some of the light that is directed inward is irradiated and reflected by the thermistor 15, which has a white surface arranged on the inside of the inner cover 16. Note that the position of the light output section 16g of the inner cover 16 in FIG. 5 is located outside the columnar partition 12C that constitutes the protector section, but it may be formed so that it overlaps with the partition 12C or is located inside. Also, instead of bulging, the head of the light output section 16g may be made flat.

上記のように構成された本実施例の内カバー１６を備えた熱感知器においては、建造物の天井面に設置された状態でＬＥＤ１７が点灯されると、内カバー１６のすり鉢状部１６ｂ全体およびリング状の出光部１６ｇが発光し、その光が複数の隔壁１２Ｃ間すなわち３６０°いずれの方向からも見える状態になるため視認の方向性がないとともに、トータルの発光面積が前述の実施例の熱感知器よりも大きくなる。また、出光部１６ｇから出た光が隔壁１２Ｃの側面および白色のサーミスタ１５を照らすため、一層視認性が向上することとなる。 In a heat detector equipped with the inner cover 16 of this embodiment configured as described above, when the LED 17 is turned on while the detector is installed on the ceiling surface of a building, the entire cone-shaped portion 16b of the inner cover 16 and the ring-shaped light-emitting portion 16g emit light, and the light is visible from any direction between the multiple partition walls 12C, i.e., 360°, so there is no directionality in visibility and the total light-emitting area is larger than that of the heat detector of the previous embodiment. In addition, the light emitted from the light-emitting portion 16g illuminates the side surface of the partition wall 12C and the white thermistor 15, further improving visibility.

以上の説明から、上記実施形態の感知器は、サーミスタ１５と外カバー１２（化粧カバー１３を含む）は同系色である、サーミスタ１５と外カバー１２とは異なる色の発光色がＬＥＤ１５から出射され、内カバー１６又はプロテクタ（１２Ｂ，１２Ｃ）とサーミスタ１５でＬＥＤ１７の発光色を導く、外カバーと同系色でＬＥＤの発光色が反射しやすい色に着色したサーミスタを設けた、という特徴を有していることが分かる。 From the above explanation, it can be seen that the sensor of the above embodiment has the following features: the thermistor 15 and the outer cover 12 (including the decorative cover 13) are similar in color; the LED 15 emits an emissive color that is different from that of the thermistor 15 and the outer cover 12; the inner cover 16 or the protector (12B, 12C) and thermistor 15 guide the emissive color of the LED 17; and a thermistor is provided that is similar in color to the outer cover and that easily reflects the emissive color of the LED.

以上、本発明を実施形態に基づいて説明したが、本発明は上記実施形態に限定されるものではない。例えば、上記実施形態では、内カバー１６を透光性材料で形成して内カバー１６の鍔部１６ｃにＬＥＤ１７からの光が誘導されて発光するように構成しているが、プロテクタ部を外カバー１２と別体にして、白濁色又は構造的に光を反射可能な加工を施した透光性材料で形成し、ＬＥＤ１７からの光をＬＥＤ１７直上に配置した隔壁１２Ｃ経由でプロテクタ部全体へ誘導して発光させるように構成しても良い。 Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments. For example, in the above embodiment, the inner cover 16 is formed from a translucent material and the light from the LED 17 is guided to the flange 16c of the inner cover 16 to emit light, but the protector part may be formed separately from the outer cover 12 and from a translucent material that is opaque or structurally processed to be able to reflect light, and the light from the LED 17 may be guided to the entire protector part via the partition wall 12C located directly above the LED 17 to emit light.

この場合、プロテクタ部を透明な材料で形成すると白色の外カバー１２と見かけが異なってしまうので、プロテクタ部の形成素材内に光を乱反射させる筐体色と同じ系統（例えば、白色）の微粒子を混入した筐体色と同じ系統の色で濁った透光性材料で形成するのが望ましい。これにより、ＬＥＤ１７の消灯時にプロテクタ部は筐体色に近い色合いとなり、感知器全体を同系の色で統一し、天井面に設置した際に熱感知器を目立たなくすることができる。また、プロテクタ部を構造的に光を反射可能な加工を施した透光性材料で形成した場合、非透光時は筐体色が背景色として透過され、透光時は発光色で発光させることができ、感知器全体を同系の色で統一し、天井面に設置した際に熱感知器を目立たなくすることができる。
また、作動表示灯の点灯時は、作動表示を視認性が高い形で表示ができる。よって、監視時は、周囲環境の色合いと調和する色で目立たないようにし、発光時は発光部を最大限目立つように示させることができる。 In this case, if the protector is made of a transparent material, it will look different from the white outer cover 12, so it is preferable to make the protector out of a translucent material that is a cloudy color of the same color as the color of the case, in which fine particles of the same color (e.g., white) that diffusely reflect light are mixed into the material that forms the protector. This allows the protector to have a color close to the color of the case when the LED 17 is turned off, and the entire detector can be unified in the same color, making the heat detector less noticeable when installed on the ceiling. Also, if the protector is made of a translucent material that has been structurally processed to be able to reflect light, the color of the case is transmitted as the background color when not transmitting light, and the luminous color can be emitted when transmitting light, making the entire detector unified in the same color and making the heat detector less noticeable when installed on the ceiling.
In addition, when the operation indicator light is turned on, the operation indication can be displayed in a highly visible form. Therefore, when monitoring, the indicator can be made inconspicuous by using a color that blends in with the surrounding environment, and when emitting light, the light-emitting part can be made to stand out as much as possible.

１０熱感知器
１１本体ケース
１２外カバー
１３化粧カバー
１４回路基板
１５サーミスタ（熱感知素子）
１６内カバー
１６ａ円筒部
１６ｂすり鉢状部
１６ｃ鍔部
１６ｄ係止片
１６ｅ導光部
１６ｆ反射部
１７ＬＥＤ（発光素子）
１８被膜
１９充填樹脂 10 Heat detector 11 Body case 12 Outer cover 13 Decorative cover 14 Circuit board 15 Thermistor (heat detection element)
16 Inner cover 16a Cylindrical portion 16b Cone-shaped portion 16c Flange portion 16d Locking piece 16e Light guide portion 16f Reflection portion 17 LED (light emitting element)
18 Coating 19 Filled resin

Claims

A heat detector in which a circuit board on which a heat sensing element and components constituting a detection circuit are mounted is housed inside a housing consisting of a bottomed cylindrical main body case and an outer cover member covering the opening side of the main body case, and an opening is formed in the outer cover member at a position corresponding to the heat sensing element, and a protector part is provided which has an inlet through which outside air can flow in, forms a space facing the tip of the heat sensing element, and covers the opening,
The surface of the heat sensing element is colored in the same color family as the surface of the outer cover member and in a color that easily reflects the color of the indicator light ,
an operation indicator light capable of emitting light from a portion of the outer cover member is disposed on the housing;
the operation indicator lamp includes a light-emitting element mounted on the circuit board, a light-emitting portion formed of a light-transmitting material and disposed around the heat-sensing element, and a light-guiding portion that guides the light emitted from the light-emitting element to the light-emitting portion;
the heat sensing element and the light emitting portion are arranged so that a part of the light emitted from the light emitting portion is irradiated onto a surface of the heat sensing element;
the light output section is configured by an inner cover having an insertion hole with an inner diameter larger than a diameter of the heat sensing element and a cone-shaped portion expanding from the circuit board side of the insertion hole in a direction away from the circuit board, the inner cover is disposed so that a base of the heat sensing element is positioned within the insertion hole, and the cone-shaped portion is disposed so as to correspond to an opening of the outer cover member,
A part of the light emitted from the mortar-shaped portion or the flange portion on the outer side of the mortar-shaped portion is irradiated onto the surface of the heat sensing element ,
A heat detector characterized in that a coating of the same color as the surface of the outer cover member is provided on a portion of the front or back surface of the funnel-shaped portion.

A heat detector in which a circuit board on which a heat sensing element and components constituting a detection circuit are mounted is housed inside a housing consisting of a bottomed cylindrical main body case and an outer cover member covering the opening side of the main body case, and an opening is formed in the outer cover member at a position corresponding to the heat sensing element, and a protector part is provided which has an inlet through which outside air can flow in, forms a space facing the tip of the heat sensing element, and covers the opening,
The surface of the heat sensing element is colored in the same color family as the surface of the outer cover member and in a color that easily reflects the color of the indicator light,
an operation indicator light capable of emitting light from a portion of the outer cover member is disposed on the housing;
the operation indicator lamp includes a light-emitting element mounted on the circuit board, a light-emitting portion formed of a light-transmitting material and disposed around the heat-sensing element, and a light-guiding portion that guides the light emitted from the light-emitting element to the light-emitting portion;
the heat sensing element and the light emitting portion are arranged so that a part of the light emitted from the light emitting portion is irradiated onto a surface of the heat sensing element;
the light output section is configured by an inner cover having an insertion hole with an inner diameter larger than a diameter of the heat sensing element and a cone-shaped portion expanding from the circuit board side of the insertion hole in a direction away from the circuit board, the inner cover is disposed so that a base of the heat sensing element is positioned within the insertion hole, and the cone-shaped portion is disposed so as to correspond to an opening of the outer cover member,
A part of the light emitted from the mortar-shaped portion or the flange portion on the outer side of the mortar-shaped portion is irradiated onto the surface of the heat sensing element ,
A heat detector characterized in that the surface of the heat sensing element is formed into a matte finish.

A heat detector as described in claim 1 or 2, characterized in that the funnel-shaped portion is formed of a transparent material, and the surface of the circuit board on which the heat sensing element is mounted is colored in the same color scheme as the surface of the outer cover member.