JP2001134860A - Sensor attaching base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a sensor attaching base to be made thin and to be remarkably reduced in production cost as well. SOLUTION: The sensor attaching base 20 fixed on the ceiling or the like for electrically and mechanically freely attachably and detachably holding a fire sensor, is provided with a thin type attaching base 20 worked/formed from a sheet metal and almost housed inside a sensor cover in the state of attaching the sensor, plural fitting pieces 44-1 to 44-4 integrally formed at the peripheral edge of the attaching base 20 for fitting the sensor side, terminal block 46-1 fixed on the sensor attaching surface of the attaching base 20, equipped with a sensor contact part 100 and lead wire inserting holes 102-1 and 102-2 and molded with an insulated resin material, and a terminal block 46-2 fixed on the sensor attaching surface of the attaching base 20, equipped with the sensor contact part 100, and the lead wire inserting holes 102-1 to 102-2, and an accident indicating lamp 48 molded with the insulated resin material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor mounting base fixed to a ceiling surface or the like and holding a fire detector in an electrically and mechanically detachable manner.

[0002]

2. Description of the Related Art FIGS. 21 to 24 show a conventional photoelectric smoke detector. FIG. 21 is a transverse sectional view, FIG.
3 is an arrangement structure diagram of the smoke detector, FIG. 24 is an exploded view of FIG.
FIG. 4 is an explanatory view of a mounting base.

In FIGS. 21 and 22, an outer cover 20 is shown.
1, a terminal board 203 is housed, and a shield case 204 is fixed inside the terminal board 203. The smoke detector main body 205 is fitted to the terminal board 203, and the smoke detector main body 205
A printed circuit board 208 is mounted thereon. A plurality of smoke inlets 202 are opened around the outer cover 201. A smoke detection unit cover 211 is detachably attached to the lower surface of the smoke detection unit main body 205.

On the peripheral wall of the smoke detector cover 211, a smoke inlet 2 is provided.
15 are formed, and a plurality of labyrinth members 213 are formed inside the peripheral wall. Further, an insect screen 214 is integrally provided on the smoke detection unit cover 211.

The light emitting holder 21 on the lower surface of the smoke detector main body 215
7, a light emitting element 221 such as an infrared LED is stored, and a light receiving holder 216 stores a light receiving element 220 such as a photodiode PD. Light emitting element 221 and light receiving element 220
Are arranged such that the respective optical axes intersect at an angle of, for example, 70 ° in the center of the smoke detection space as shown in FIG.
In addition, 228 is a test infrared LED, and 232 is a plate member having a slit hole.

In this conventional photoelectric smoke detector, as shown in FIG. 24, a terminal board 203, a shield case 204, a packing 207, a printed circuit board 208, a smoke detector main body 205, a smoke detector cover 211 and an outer cover 201 are provided. It is composed by assembling.

Such a photoelectric smoke detector is, for example, shown in FIG.
The ceiling surface is mounted by a mounting base 300 as shown in FIG. The mounting base 300 is mounted on the ceiling surface by inserting and screwing a screw into the screw through hole 301.
A pair of fitting receiving portions 302 are provided on the lower surface of the mounting base 300, and are electrically and mechanically turned by the fitting fitting 209 mounted on the upper part of the terminal board 203 in FIG. Is fixed.

The mounting base 300 is formed of a synthetic resin of the same color as the outer cover 201 on the sensor side shown in FIG. 24 since its periphery is exposed to the outside near the ceiling surface. In connection with the lead wire, the lead wire in the ceiling is drawn out from the wiring through hole 304 and is connected and fixed by the screw of the terminal fitting 305.

Some mounting bases have a warning indicator light. In this case, a circuit board on which the warning indicator light and the electric circuit components constituting the display circuit are mounted is further mounted on the ceiling surface. Arranged and stored.

[0010]

However, such a conventional photoelectric smoke sensor mounting base is provided with a conductive fitting for electrically connecting to the sensor side. Therefore, it must be made of an insulating material such as a synthetic resin, and has a sufficient thickness to increase the mechanical rigidity when the resin is molded.

For this reason, when the sensor is mounted, it protrudes further from the ceiling surface by an amount corresponding to the mounting base, and even if the sensor is made thinner, there is a problem that the mounting base impairs the thinning. . In addition, because it is resin molding,
A dedicated mold is expensive, and there is a problem in that cost is required for improvement of the mounting base accompanied by a change in shape.

If a screw is inserted into a pair of screw holes 301 and screwed into a screw hole of an outlet box provided on the ceiling, the whole mounting base may be deformed. Due to this deformation, there is a problem that it is difficult to fit the sensor when the sensor is mounted on the mounting base. Furthermore, in the mounting base with the alarm indicator light,
Since a circuit board is also required, the cost increases,
Assembly was also complicated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sensor mounting base that can be easily made thinner and can greatly reduce the manufacturing cost.

[0014]

In order to achieve this object, the present invention is configured as follows.

The present invention is a detector mounting base fixed to a ceiling surface or the like and electrically and mechanically detachably holding a fire detector. The base is formed by processing a metal plate and detects a fire in a mounted state of the detector. A thin base body substantially housed in the cover, a plurality of fitting pieces integrally formed on the periphery of the base body to fit the sensor side, and at least the sensor fixed to the sensor mounting surface of the base body. A pair of terminal blocks each having a contact portion, a lead wire insertion hole, and molded with an insulating resin material.

As described above, the sensor mounting base of the present invention comprises:
Since it can be made by sheet metal processing, sufficient rigidity can be ensured even if it is thin, and it can be easily manufactured and greatly reduced in cost as compared with resin molded products.

Further, when the sensor is mounted, the mounting base is almost housed in the outer cover and hidden, so that it cannot be seen from the outside. Therefore, painting for improving the appearance of the mounting base is not particularly required. Is sufficient, and the manufacturing cost can be further reduced.

The shape of the mounting base can be changed relatively easily and inexpensively as compared with a mold for molding a synthetic resin.

The sensor mounting base of the present invention is a terminal block having no alarm indicator light, and is divided into a sensor contact portion and a lead wire contact portion, and is a conductive terminal having a sheet metal processing shape connecting the both. It is characterized in that the metal fitting is covered with a member molded with an insulating resin material.

Further, the sensor mounting base of the present invention, as a terminal block having a warning indicator light, disconnects the connection between the sensor contact portion and the lead wire contact portion and connects the warning indicator light between them. A conductive terminal fitting having a processed sheet metal shape is covered with a member molded with an insulating resin material. For this reason, the terminal fitting used for the terminal block mounted on the base body is shared, and the number of parts can be reduced by selectively connecting the alarm indicator.

Further, the mounting base of the present invention is characterized in that a wiring through hole is formed in the center of the base body, and a pair of mounting screw through holes provided with a cutout portion with a part left around. For this reason, even if the screws that pass through the mounting screw through holes are screwed into the screw holes of the ceiling plate or the outlet box behind the ceiling and tightened, only the peripheral part of the mounting screw through hole is deformed because the cutout is provided. Only, the base body itself does not deform.

[0022]

FIG. 1 is a cross-sectional view of a photoelectric smoke detector according to the present invention when it is mounted on a ceiling surface.

In FIG. 1, a photoelectric smoke detector 1 according to the present invention is shown.
No. 0 has a smoke detection section 14 interposed between the insect cover 12 and the inside of the outer cover 11, and a nameplate seal 18 is affixed to the upper surface side of the smoke detection section 14. When the photoelectric smoke detector 10 is pushed into the mounting base 20 fixed to the ceiling surface with screws and turned around, the fitting protrusion 49 inside the outer cover 11 is fitted to the fitting piece on the mounting base 20 side. It fits and is supported and fixed as shown.

A plurality of smoke inlet windows 22 are opened around the outer cover 11 of the photoelectric smoke detector 10. Outer cover 1
The smoke detector 14 incorporated in 1 forms a smoke detector chamber formed at the bottom of the smoke detector main body 15 with an opening at the bottom, in which the light receiving unit holder 30 and the light emitting unit holder 32 are arranged. I have.

An infrared LED is provided inside the light emitting portion holder 32.
The light emitting element 38 using is incorporated. The hybrid circuit board 36 is incorporated in the light receiving section holder 30. On the hybrid circuit board 36, an integrated circuit 42 integrally including the light receiving unit 40 is mounted.

On the hybrid circuit board 36, a capacitor C1 for supplying a current necessary for pulse emission of the light emitting element 38, and electric circuit components not incorporated in the integrated circuit 42 are mounted as discrete chip components.

A pair of lead fittings 52-1 and 52-2 are provided on the back side of the smoke detection section main body 15, and base contact portions 58-1 and 58-2 are formed on the outer peripheral end side. .
The base contact portions 58-1 and 58-2 are attached to the mounting base 2
A pair of terminal blocks 46-1 and 46-
2 in electrical contact.

The lead wires 54-1 and 54-2 are inserted into and connected to the terminal blocks 46-1 and 46-2 from the rear side of the ceiling through wiring holes in the center of the base.

FIG. 2 shows an exploded view of the photoelectric smoke detector according to the invention of FIG. 1 together with a mounting base.

In FIG. 2, the photoelectric smoke detector 1 of the present invention is shown.
Reference numeral 0 denotes an outer cover 11, an insect net 12, a smoke detector main body 15, a smoke detector assembly 16 including a hybrid circuit board 36, and a nameplate seal 18 from the lower side.
As shown in FIG.

The outer cover 11 has a smoke inlet window 22 formed on the lower outer periphery. In addition, a display hole 24 is provided, where the tip of an alarm indicator 48 provided on the mounting base 20 side is located. In addition, the display hole 24 also has a function as a drain hole for draining water so that water leak from the ceiling is not collected inside the sensor.

Following the outer cover 11, an insect net 12 is provided. As the insect repellent net 12, for example, a cloth having a mesh of fiber is used. When the smoke detection unit main body 15 is assembled to the outer cover 11, the insect repellent net 12 is located therebetween, and as shown in FIG. And the smoke detection unit main body 15 and is interposed between the smoke inflow window 22 and the internal smoke detection space.

The smoke detector 14 comprises a smoke detector main body 15 and a smoke detector assembly 16. The smoke detection unit main body 15 is provided with a peripheral wall 2 having an opening 28 below the upper disk-shaped base 25.
The labyrinth structure is provided inside the peripheral wall 26, and the light receiving unit holder 30 and the light emitting unit holder 32 are arranged in the smoke detection space inside.

A pair of mounting arms 34 project from both sides of the base 25. The main feature of the smoke detection section main body 15 is that no bottom is provided below the peripheral wall 26 and the outer cover 11
The bottom is open to the side. For this reason, as shown in FIG. 1, the smoke that has entered through the surrounding smoke inflow window 22 while being assembled inside the outer cover 11 flows into the internal smoke detection space through the opening 28 between the peripheral walls 26, and is simultaneously opened. The smoke flows into the smoke detection space from a certain bottom, and the smoke inflow efficiency and the flow direction characteristics are extremely good.

The smoke detection section assembly 16 is in contact with a pair of lead fittings (first lead fittings) 50-1 and 50-2 for connecting the light emitting element 38 to the hybrid circuit board 36 and the mounting base 20. Are provided with a pair of lead fittings (second lead fittings) 52-1 and 52-2.

The integrated circuit 4 is mounted on the hybrid circuit board 36.
2 is mounted, and the integrated circuit 42 integrally includes a light receiving element therein, and therefore, a light receiving unit 40 including a lens is provided. This smoke detector assembly 16 is assembled into the smoke detector main body 15 from above in the assembled state shown in the drawing,
The hybrid circuit board 36 on which the integrated circuit 42 is mounted is located in the light receiving unit holder 30, and the light emitting element 38 is also located in the light emitting unit holder 32, thereby realizing a scattered light type smoke detection structure.

The nameplate seal 18 provided following the smoke detector 14 is attached so as to cover the opening of the smoke detector 14 after the smoke detector assembly 16 has been assembled into the smoke detector main body 15 from above.

As described above, in the photoelectric smoke detector according to the present invention, the outer cover 11, the insect screen 12, the smoke detector main body 15, the smoke detector assembly 16 including the hybrid circuit board 36, and the nameplate seal are provided. It can be completed by assembling 18 5 parts.

When this is compared with the conventional photoelectric smoke detector shown in FIG. 23, conventionally, seven parts from the lower outer cover 201 to the upper terminal board 203 are required, and the smoke detector main body is also required. 205, the light receiving element 220 is housed in the light receiving section holder 216, and the light emitting element 22 is stored in the light emitting section holder 217.
Although it is necessary to assemble a plurality of parts such as incorporating the smoke detector 1 in the present invention, one of the smoke detector assembly 16
I'm done.

As a result, in the photoelectric smoke detector according to the present invention, the number of parts at the time of assembling is greatly reduced, assembling is easy, the cost can be reduced, and the thickness is reduced. The size and size can be reduced.

The mounting base 2 for mounting the photoelectric smoke detector of the present invention completed by assembling the five parts on a ceiling surface or the like.
0 is a fitting piece 44-1, 44-2, 44-
3, 44-4 are formed, and a wiring through hole 45 is provided in the center,
Further, two mounting screw through holes 1 are provided toward the wiring through hole 45.
01-1 and 101-2 are formed.

The fitting pieces 44-1 to 4-4 of the mounting base 20
The fitting projection 49 inside the outer cover 11 shown in FIG. 1 is fitted into each of 4-4 to support and fix the sensor side.

With such a thin structure, the mounting base 20 can be easily formed by punching by sheet metal working. A pair of terminal blocks 46-1 and 46-2 are attached to the mounting base 20 downward, and one of the terminal blocks 46-2 has an alarm indicator 4
8 is attached.

The mounting base 20 is fixed to a ceiling surface or an outlet box above the ceiling with screws, and the photoelectric smoke detector 10 is attached to fitting pieces 44-1 to 44-4 formed around the mounting base 20. It can be attached and fixed as shown in FIG. 1 by fitting and turning it from below.

Therefore, as shown in the plan view of FIG. 3A, the fitting piece 4 of the mounting base 20 is provided inside the upper portion of the outer cover 11.
Fitting protrusions 49 are formed at four locations corresponding to 4-1 to 44-4. These fitting projections 49 are fitted into the fitting pieces 44-1 of the mounting base 20 by being turned around as shown in FIG.

The mounting base 20 enters the inside of the outer cover 11 when the photoelectric smoke detector 10 of the present invention is mounted as shown in FIG. 1, and the mounting base 20 is not exposed to the outside. For this reason, the mounting base does not need to be made of a synthetic resin like the outer cover 11 on the sensor side as in the conventional photoelectric smoke detector, and it is not necessary to apply painting or the like to improve the appearance. It is sufficient to perform the rust prevention treatment on the base 20, and the cost of the mounting base itself can be reduced accordingly.

Further, since the mounting base 20 is very thin, the amount of protrusion of the photoelectric smoke detector 10 in the ceiling mounted state can be made sufficiently small. In addition, the photoelectric smoke detector 10 integrates a detector circuit, and further integrates the detector circuit with the hybrid circuit board 3.
6 and housed in the light receiving unit holder 30 of the smoke detection unit main body 15, it is not necessary to form a space for storing a circuit board conventionally formed on the upper part of the smoke detection unit 14. . Combined with the thin mounting base, the amount of protrusion from the ceiling surface can be significantly reduced as compared with the conventional case.

As described above, since the circuit board storage section is not required above the smoke detection section, the height of the sensor body is greatly reduced, and a small and thin sensor structure is realized.

FIG. 4 shows the smoke detector assembly 16 of FIG.
5 is shown in FIG. The smoke detector assembly 16 includes a pair of lead fittings (first lead fittings) 50-1 and 50 on the end of the hybrid circuit board 36.
-2 is fixedly connected to one end, and the light-emitting element 38 is fixedly connected to the other end by supporting the leads 56-1 and 56-2.

The leads 56-1 and 56-2 of the light emitting element 38
5, the optical axis is positioned at a predetermined intersection angle with respect to the optical axis from the light receiving element built in the integrated circuit 42 as shown in the plan view of FIG. The structure is realized. The pair of lead fittings 50
-1 and 50-2 are not used, and the lead 56- of the light emitting element 38 is used.
1, 56-2 may be formed like lead metal fittings 50-1, 50-2, and may be directly connected to the end of the hybrid circuit board 36.

On the hybrid circuit board 36, a pair of lead fittings (second lead fittings) 52-
1, 52-2 are connected and fixed. Lead fitting 52-
Base contact portions 58-11 and 58-2 are formed at the outer ends of the first and second 52-2 by a rectangular bent structure.

The lead fittings 50-1, 50-2, 52
Each of −1 and 52-2 is provided with one or a plurality of boss holes 35. The boss holes 35 are fitted into bosses provided on the back surface side of the base 25 in the smoke detection section main body 15 in FIG. 2 and used for positioning and fixing the respective bosses.

FIG. 6 shows the hybrid circuit board 36 of FIG.
Has been taken out. FIG. 6A shows a light receiving portion surface 36-1 located on the smoke detection space side. An opening 60 is formed at a predetermined position of the hybrid circuit board 36, and the light receiving portion 40 is positioned here.

FIG. 6B shows a component mounting surface 36-2 on the back surface side of the light receiving portion surface. On this component mounting surface 36-2,
Integrated circuit 4 in which most of the light receiving element and the sensor circuit are mounted
2 are mounted upside down, and electric circuit components not included in the integrated circuit 42 are mounted around the integrated circuit 42 as surface-mounted discrete chip components 62.
Also, the surface mount capacitor C1 for supplying the light emitting current of the light emitting element is mounted as a separate component because it is a large-capacity electrolytic capacitor.

FIG. 7A shows the integrated circuit 42 taken out from the back side. The integrated circuit 42 has a positioning hole 42-2 in the lead frame 42-1 at a diagonal position. As shown in FIG. 6B, when the lead frame of the integrated circuit 42 is mounted on the component mounting pads provided on the hybrid circuit board 36 by a solder flow, cream solder is printed on the component mounting pads. The cream solder should not be put on the portion corresponding to the positioning hole 42-2 on the pad.

When the solder flow is performed in this state, the positioning hole 42-2 is aligned with the portion of the pad where there is no cream solder by the surface tension of the solder, whereby the position of the lens portion 40-1 with respect to the opening 60 in FIG. Positioning is performed.

FIG. 7B is a sectional view of the hybrid circuit board 36. In the hybrid circuit board 36, the integrated circuit 42 is mounted in the central opening 60 upside down from the component mounting surface 36-2 side. The integrated circuit 42 is an IC chip 6 in which a circuit including a light receiving element and an amplifier circuit is integrated.
And the lens unit 40-1 is integrally disposed in front of the light receiving element on the IC chip 64 to thereby form the light receiving unit 4
0 is formed. The light receiving element on the IC chip 64 is arranged at the focal point of the lens unit 40-1. Further, the IC chip 64 is bonded to the ground of the lead frame in the integrated circuit 42, and is less affected by noise.

Component mounting surface 3 of hybrid circuit board 36
The integrated circuit 42 mounted on the 6-2 side, the capacitor C1,
On the rear side of the chip component 62, a coating layer 66 of an epoxy resin or the like is formed to enhance corrosion resistance. According to such a structure of the hybrid circuit board 36, the integrated circuit 42 and the chip component 62, which is a discrete component, are further provided on the component mounting surface 36-2 side without affecting the light receiving unit 40 side of the integrated circuit 42. Solder connection by reflowing to the solder layer with the capacitor C mounted,
Subsequently, the coating layer 66 can be formed by performing coating in which only one surface is dipped, so that assembling is easy and the cost is reduced accordingly.

The lead fitting to be connected and fixed to the hybrid circuit board 36 has, for example, a fitting structure as shown in FIG. Lead fitting 5
0-1 is bent upward on the mounting side of the hybrid circuit board 36 to form a pair of claws 54-1 and 54-2, and the fitting claws 54-3 are bent by separating the thickness of the circuit board therebetween. are doing. For this reason, as shown in FIG. 7B, the end surfaces of the hybrid circuit board 36 are fitted to the fitting claws 54-1 and 54-2 and the fitting claws 54.
-3, and connected and fixed by soldering or the like.

FIG. 8 shows a hybrid circuit board 36 of the present invention.
FIG. 2 is an embodiment of a circuit diagram of a sensor circuit implemented in FIG.

In FIG. 8, the hybrid circuit board 36
Includes diodes D1 to D4, a Zener diode ZD1, a capacitor C1, and a transistor Q in addition to the integrated circuit 42.
6. It is only necessary to mount a total of 10 components of the resistors R1 and R36. The light emitting element 38 includes a first lead metal fitting 50-1,
50-2.

Here, the diodes D1 to D4 are connected to the terminals L,
A diode bridge is configured as a rectifier circuit for C. The next zener diode ZD1 becomes a noise absorbing circuit. The capacitor C1 is a capacitor that supplies a light-emitting current that flows to the light-emitting element 38 by the oscillation circuit provided in the integrated circuit 42. The resistor R1 sets a current flowing through the light emitting element 38. The transistor Q6 switches the light emitting element 38. The resistor R31 sets a reference voltage of the comparison circuit.

FIG. 9 is a circuit diagram showing details of the detector circuit of FIG. The sensor circuit of the present invention includes a rectifier / noise absorbing circuit 68, a fire signal output circuit 70, a constant voltage / current limiting circuit 72, an oscillating circuit 74, a counter circuit 76, and a comparing circuit 8.
This is a conventional type sensor circuit composed of a zero and an amplifier circuit 78.

The rectifying / noise absorbing circuit 68, the capacitor C1 for supplying a light emission current to the oscillation circuit 74, the transistor Q6 for switching the light emitting element 38 driven by the oscillation circuit 74, the current limiting resistor R1, and the reference of the comparison circuit The resistor R31 for setting the voltage is an external circuit composed of electric components, and other circuits are provided in the integrated circuit 42.

The sensor circuit will be described in more detail as follows. The sensor circuit has terminals L and C to which leads (sensor lines) serving as power supply signal lines from the disaster prevention monitor board are connected. Diodes D1 to D follow terminals L and C.
4 and a rectification / noise absorption circuit 68 using a zener diode ZD1.

Subsequently, a self-holding fire signal output circuit 70
Is provided. The fire signal output circuit 70 is a transistor Q
1, Q2, resistors R4 to R6, a capacitor C2, and a diode D5. The output from the counter circuit 76 turns on and latches the transistors Q1 and Q2.
A fire signal is sent to the disaster prevention monitor panel by sending an alarm current in the meantime.

Next, a constant voltage / current limiting circuit 72 constituting a power supply circuit is provided. Transistor Q4, resistor R7,
A constant voltage circuit is configured by the capacitor C3 and the zener diode ZD2. The transistor Q4 and the resistor R8 form a current limiting circuit.

Subsequently, an oscillation circuit 74 is provided. The oscillation circuit 74 includes transistors Q5 and Q6, resistors R9 to R13,
It is composed of a capacitor C4 and a diode D6, and switches the transistor Q6 at a cycle of, for example, two seconds to allow a light-emitting current to flow to the light-emitting element 38 via the power-supply limiting resistor R1.
The light emitting current flowing through the light emitting element 38 is supplied from an external capacitor C1 provided subsequent to the constant voltage / current limiting circuit 72.

Next, the amplifier circuit 78 will be described. Amplifier circuit 7
8 is provided with a light receiving element 43 using an infrared photodiode. The light receiving current due to the scattered light received by the light receiving element 43 includes transistors Q7 to Q9 and resistors R20 to R9.
27, amplified by an amplifier circuit 78 including capacitors C6 to C9.

Subsequent to the amplification circuit 78, a comparison circuit 80 is provided. The comparison circuit 80 includes transistors Q10 and Q1.
1. A counter circuit composed of resistors R28 to R34 and capacitors C11 and C12. The transistors Q10 and Q11 are turned on in response to the output of the amplifying circuit 78 exceeding a predetermined threshold, and the light receiving signal which becomes H level is synchronized with the oscillation pulse to generate a counter circuit. 76.

The counter circuit 76 includes D-FFs (delay flip-flops) 82 and 84, resistors R14 to R18,
It is composed of a capacitor C5. The D-FFs 82 and 84 are
When an H level output is obtained twice consecutively in synchronization with a clock by an oscillation pulse from the oscillation circuit 74, the output Q of the D-FF 84 in the output stage is inverted from L level to H level. Then, the transistors Q1 and Q2 of the fire signal output circuit 70 are turned on, and a fire signal is sent to the disaster prevention monitor panel side by causing an alarm current to flow.

The transistor Q of the fire signal output circuit 70
1 and Q2 constitute a latch circuit, and the counter circuit 7
When the Q output of the D-FF 84 at the output stage of No. 6 becomes H level, even if the D-FFs 82 and 84 are reset after a predetermined time by the time constant of the capacitor C5 and the resistor R18, the output state of the fire signal is maintained. . The comparison circuit 80 and the counter 76 constitute a smoke detection circuit.

The circuit configuration of the integrated circuit 42 shown in FIGS. 8 and 9 is merely an example, and the light receiving element 43 and at least the amplifying circuit 7
If the circuit 8 is integrated, it is needless to say that an appropriate circuit configuration can be obtained as needed.

Further, in addition to the first integrated circuit in which the light receiving element 43 and the amplifier circuit 78 are integrated, a plurality of integrated circuits may be formed together with the second integrated circuit in which other circuits are integrated.

FIG. 9 is a sectional view of another embodiment of the hybrid circuit board 36 used in the photoelectric smoke detector of the present invention. FIG. 10 is a sectional view of an assembled state. In this embodiment, a lens unit 86
Has a separation structure.

Therefore, the integrated circuit 42 is mounted on the opening 60 of the hybrid circuit board 36 from the back side, the capacitor C1 and the chip component 62 are mounted on the back side and solder reflow is performed, and then the lens unit 86 is mounted on the integrated circuit 42. It is attached to the light receiving surface side, and thereafter, a coating layer 66 is formed and fixed.

The projection 86 provided on the lens unit 86
1, 86-2 are inserted into insertion holes provided at corresponding positions of the hybrid circuit board 36, and in this state, a coating layer 66 is formed on the component mounting surface 36-2 side, whereby the protrusions 86-1, 86-2 can be glued to the substrate.

As described above, since the lens unit 86 has a structure separated from the integrated circuit 42, the lens unit 86 is larger than the lens unit 40-1 provided integrally with the integrated circuit 42 as shown in FIG. 7B. It is possible to use a general-purpose package without newly forming a mold for an integrated circuit with a lens.

FIG. 11 shows another embodiment of the hybrid circuit board 36 used in the photoelectric smoke detector of the present invention, which is characterized in that the light emitting section is also provided.

In FIG. 11, the hybrid circuit board 3
The configuration of the light receiving unit side with respect to 6 is the same as that of the embodiment of FIG.
This is a structure in which the lens unit 86 is separated. In addition, a surface-mounted light emitting element 88 is mounted on the lower side, and an optical member in which a light guide 90 and a light emitting lens 90 are integrated is attached to the light emitting element 88.

The optical member having the light guide 90 and the light-emitting lens 92 can be easily made of a transparent plastic material such as an acrylic transparent resin. Then, the light-shielding plate 94 is positioned between the lens unit 86 of the light-receiving unit 40 and the light-emitting lens 92 in a state of being incorporated in the smoke detection unit, and a scattered light type smoke detection structure can be realized.

Further, since the light emitting portion side is supported and fixed to the hybrid circuit board 36, a pair of light emitting elements 38 for supporting and fixing the light emitting element 38 as shown in the smoke detecting portion assembly 16 of FIGS. Lead metal fittings 50-1 and 50-
2 becomes unnecessary, and the structure of the smoke detection section assembly 16 can be simplified accordingly.

FIG. 12 shows another embodiment of the smoke detector assembly 16 used in the photoelectric smoke detector of the present invention. The smoke detector assembly is characterized in that a circuit on the light emitting unit side, which requires a relatively large current to flow from the hybrid circuit board 136, is provided on the light emitting circuit board 96.

That is, in the hybrid circuit board 36 of the embodiment of FIG. 4, as shown in FIG. 9, the transistor Q6, the current limiting resistor R1, and the capacitor C1 through which a relatively large current flows in the detector circuit are connected to the noise. When a large light-emitting current flows through the light-emitting element, noise may be radiated from the pattern or lead wire of the substrate and adversely affect the light-receiving circuit side because it is provided together with the circuit on the light-receiving section that is easily affected by is there.

In the embodiment shown in FIG. 12, electric components on the light emitting circuit section side where a relatively large current flows are separated from the hybrid circuit board 136 and provided on the light emitting circuit board 96 together with the light emitting element 38, and the light emitting section holder is provided. Stored in 32,
Fix it.

FIG. 13 is a circuit diagram of the light emitting circuit board 96 of FIG. 12. The switching transistor Q6, the light emitting element 38, the current limiting resistor R1, and the electrolytic capacitor C1 shown in the sensor circuit of FIG. Implemented.

Here, as the current limiting resistor R 1, a resistance value is selected and mounted according to the luminance of the light emitting element 38. That is, the sensitivity is adjusted by determining the luminance of the light emitting element 38 mounted on the light emitting circuit board 96 by the value of the current limiting resistor R1. Therefore, a variable resistor may be used as the current limiting resistor R1. The circuit of the light emitting circuit board 96 is SL1,
The three terminals SL2 and C are connected to the hybrid circuit board 136 side.

Referring again to FIG. 12, the light emitting circuit board 9
6, three terminals SL1, SL2, and C of FIG. 13 are connected and fixed to the three other ends of the lead fittings 50-1, 50-2, and 50-3, one ends of which are supported and fixed to the hybrid circuit board 136 side. The optical axis of the light emitting element 38 supported and further mounted on the light emitting circuit board 96 is positioned so as to have a predetermined intersection angle with the optical axis of the light receiving section 40.

In order to facilitate the positioning of the optical axis of the light emitting element 38, a loop-shaped curved portion 98 is formed at the lead portion. By forming the bent portion 98 of the lead portion, the optical axis direction of the light emitting element 38 can be easily adjusted by mechanically bending the lead, and the correct intersection angle with the light receiving portion 40 can be set. Once the direction of the optical axis of the light emitting element 38 is determined, the movement of the light emitting element 38 due to impact vibration or the like may be stopped by potting the lead portion with resin.

Of course, in the case of the hybrid circuit board 136, as in the case of FIG. 4, the lead fittings 52-1 provided with the base contact portions 58-1, 58-2 with respect to the mounting base.
52-2 is also connected and fixed.

The hybrid circuit board 136 shown in FIG.
Advantages when the light emitting unit through which a relatively large current flows are separated and arranged as the light emitting circuit board 96 are as follows.

First, the influence of the pulse noise due to the light emission drive on the amplifier circuit on the light receiving section side is greatly reduced. Further, even when the light emitting element 38 whose sensitivity cannot be completely adjusted when manufacturing the smoke detector assembly 16, it is not necessary to make the entire hybrid circuit board 36 defective as shown in FIG. The defect may be determined, and the yield at the time of assembly can be increased accordingly. Alternatively, it is easy to cope with the ranking used for products having greatly different sensitivities.

Further, the size of the hybrid circuit board 136 on the light receiving section side on which the integrated circuit 42 is mounted can be reduced by an amount corresponding to the separation of the light emitting circuit board 96, and the size of the light emitting circuit board 96 can be reduced to the original light emitting section holder. The size of the hybrid circuit board 136 provided on the light-receiving part side can be made smaller, so that the light-receiving part holder can be reduced accordingly, and the inflow characteristics of smoke from the outside into the smoke detection space can be reduced. Can be improved.

FIG. 14A is a photoelectric smoke detector 1 according to the present invention.
The mounting base 20 used for mounting the ceiling surface No. 0 is taken out. As described in the exploded view of FIG. 2, the mounting base 20 is a thin disk member formed by sheet metal processing, and protrudes to the periphery and has four fitting pieces 44-1 to 44-4.
Is formed, a wiring through hole 45 is provided at the center, and a pair of mounting screw through holes 101-1 and 101-2 are further provided.

A pair of mounting screw through holes 101-1 and 101
No. -2 is provided with a cutout portion 111 leaving a part around. For this reason, as shown in FIG. 14B, even if the screws 109 passing through the mounting screw through holes 101-1 and 101-2 are screwed into the screw holes of the outlet box 107 on the back side of the ceiling plate 105 and tightened, the cut-out portions are formed. Since the 111 is provided, only the peripheral portion of the mounting screw through hole 101 is deformed, and the base body 20 itself is not deformed.

In the mounting state of the mounting base 20, a pair of terminal blocks 46-1 and 46-2 are provided on the lower surface.
Is fixed, and an alarm indicator 48 is attached to one terminal block 46-2.

FIG. 15 shows the terminal block 46 of FIG.
-1 is taken out. As shown in FIG. 15A, the terminal block 46-1 is provided with a sensor contact portion 100 on the surface of a substantially rectangular block member, and a pair of lead wire insertion holes 1 on the side surface.
02-1 and 102-2 are open.

The terminal block 46-1 includes FIG.
A terminal fitting 104 having a structure as shown in FIG. 1B is fitted in a block member molded with an insulating synthetic resin material. The terminal fitting 104 has a sensor contact portion 100 and also has lead wire contact portions 106-1 and 106-2 located in the lead wire insertion hole 102.

Further, there is provided a connecting portion 108 for connecting the sensor contact portion 100 to the lead wire contact portions 106-1 and 106-2. On the right side of the connection section 108, a resistance connection section 110
In addition, the alarm display lamp connecting portion 112 is formed separately.

FIG. 16 shows the terminal block 46 of FIG.
-2 is taken out, and as shown in FIG. 16A, a warning indicator 48 is attached to the terminal block 46-2. A sensor contact portion 100 is provided similarly to the terminal block 46-1 in FIG. 15, and a pair of lead wire insertion holes 102-
1, 102-2 are formed.

FIG. 16B shows a terminal fitting 104 which is fitted into and built into the block member of the terminal block 46-2.
As in FIG. 15B, the sensor contact portion 100 and a pair of lead wire contact portions 106-1 and 106-2 are provided. In addition to this, the resistor 114 and the non-polarity alarm indicator 48
15B, and the connecting portion 108 in FIG. 15B is cut off by punching or the like to form a cutting portion 116.

As described above, the terminal blocks 46-1 and 46-2 used for the mounting base are basically the same block members.
The terminal block 104 is used, and the terminal block 104 with the alarm display lamp 48 as shown in FIG. -2.

In the above-described embodiment, as a combination of a pair of terminal blocks fixed to the base body, one is a combination having an alarm display lamp and the other is a combination having no alarm display lamp. Both terminal blocks may have no alarm indicator light, or both may have the alarm indicator light.

FIG. 16 shows another embodiment of the mounting base used for the photoelectric smoke detector according to the present invention, which is characterized by having a polygonal sheet metal processing shape. In FIG. 16, the mounting base is a polygon mounting base 11 in this embodiment.
The fitting pieces 120-1 to 120-4 are formed at four locations by bending the corners of a rectangular plate.

Therefore, the sheet metal working is further facilitated as compared with the shape in which the fitting piece is erected around the periphery of FIG. It is the same that the wiring through hole 122 and the mounting screw through hole 119 are provided, and the pair of terminal blocks 46-1 and 46-2 are mounted.

FIG. 18 is a development view of another embodiment of the polygonal mounting base of the present invention. This polygon mounting base 124
In the method, after forming a polygon so as to conform to the circular shape on the photoelectric smoke detector side, a pair of fitting pieces 1 having different shapes is formed.
26-1, 126-2 and 128-1, 128-2 are 90
° Provided at different positions.

The central wiring through hole 130 has a substantially rhombic shape, and its end face is bent to increase the strength. A pair of mounting screw holes 132-1 and 132-2 are provided toward the center from the opposite corners, and a pair of mounting holes 134- for mounting the terminal blocks 46-1 and 46-2 at orthogonal positions. 1, 134-2 are provided.

Of course, the mounting base used for the photoelectric smoke detector of the present invention is not limited to the above-described embodiment, but may have a fitting piece in the periphery and a wiring through hole and a mounting screw through hole in the center. For example, the shape can be formed by appropriate thin sheet metal processing.

FIG. 19 is an explanatory view of the fitting state of the polygonal mounting base and the outer cover of FIG. As shown in FIG. 19A, the outer cover 11 has four fitting grooves 136-1 on the inner periphery.
136-4. Fitting grooves 136-1 to 13
6-4 is the fitting groove 136-1 taken out in FIG.
A notch 138 is formed on the upper side and on the left side from the bottom of the opening.

Therefore, the fitting groove 1 of the outer cover 11 after assembly is
36-1 and the polygonal mounting base 1 as shown in FIG.
The fitting piece 120-1 is pushed in accordance with the position of the fitting piece 120-1, and the fitting is performed by turning in the pushed-in state as shown in FIG. 19C. The outer cover 11 can be similarly fitted to each mold mounting base 122 in FIG.

FIG. 20 is an enlarged view of the insect net 12 used in the photoelectric smoke detector of the present invention. This insect repellent net 1
A flexible fiber mesh made of a metal fiber or a chemical fiber is used as 2. At the time of assembling, a flat insect repelling net 12 is used as shown in FIG.
By assembling 4, as shown in FIG. 1, it is located around and at the bottom of the smoke detection section 14 and prevents invasion of insects from outside.

The insect net can be easily taken out by removing the outer cover 1, and dirt can be easily removed by washing with water or the like. When the outer cover 1 is removed and the sensor is cleaned, as is apparent from the exploded view of FIG.
Since the lower portion of the light emitting portion is open, dirt inside the light receiving portion holder 30 and the light emitting portion holder 32 can be easily cleaned.

Note that the present invention is not limited to the above-described embodiment, but includes appropriate modifications without impairing the objects and advantages thereof.
Further, the present invention is not limited by the numerical values shown in the above embodiments.

[0114]

As described above, according to the present invention, as a sensor mounting base, a thin base body which is formed from a metal plate and is substantially housed in a sensor cover in a state where the sensor is mounted, and a base. A plurality of fitting pieces integrally formed on the periphery of the main body and fitted to the sensor side, fixed to the sensor mounting surface of the base main body, and provided with at least a sensor contact portion, a lead wire insertion hole, and molded with an insulating resin material. With a structure with a pair of terminal blocks, the mounting base can be made by sheet metal processing, so sufficient rigidity can be ensured even if it is thin, and it is easier to manufacture and significantly lower cost than resin molded ones Can go down.

Further, when the sensor is mounted, the mounting base is almost housed in the outer cover and is concealed and cannot be seen from the outside. Therefore, painting for improving the appearance of the mounting base is not particularly required. Is sufficient, and the manufacturing cost can be further reduced. Also, the shape of the mounting base can be changed relatively easily and inexpensively as compared with a synthetic resin mold.

Further, the sensor mounting base of the present invention is a terminal block having no alarm indicator light, is divided into a sensor contact portion and a lead wire contact portion, and has a conductive shape having a sheet metal processing shape connecting the both. The terminal fittings are covered with a member molded of an insulating resin material.On the other hand, as a terminal block with a warning indicator light, the connection between the sensor contact part and the lead wire contact part is cut off and a warning is issued between the two. The terminal fittings used for the terminal block to be mounted on the base body are standardized because the conductive terminal fittings with sheet metal processing shape connected to the indicator lights are covered with a member molded with an insulating resin material.
By selectively connecting the alarm indicator, the number of parts can be reduced.

Further, the mounting base of the present invention has a wiring through hole in the center of the base body and a pair of mounting screw through holes provided with cutouts around the center of the base body. Even if the screw that passed through the mounting screw through hole is screwed into the screw hole of the outlet box and tightened, only the peripheral part of the mounting screw through hole is deformed because the notch is provided, and the base body itself No deformation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a photoelectric smoke detector according to the present invention.

FIG. 2 is an exploded view of the photoelectric smoke detector according to the present invention;

FIG. 3 is an explanatory view of a fitting state between a flat surface of an outer cover and a mounting base.

FIG. 4 is an explanatory view of the smoke detection unit assembly of FIG. 2 taken out and viewed from the light receiving unit side.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is an explanatory view of a light receiving section side and a circuit component mounting side of the hybrid circuit board of FIG. 4;

FIG. 7 is a sectional view of the hybrid circuit board of FIG. 6;

FIG. 8 is a circuit diagram of a sensor circuit mounted on the hybrid circuit board of FIG. 6;

FIG. 9 is a circuit diagram showing details of FIG. 8;

FIG. 10 is an explanatory cross-sectional view of another embodiment of a hybrid circuit board having a structure in which a lens unit is separated from a light receiving unit.

FIG. 11 is an explanatory cross-sectional view of another embodiment of the hybrid circuit board in which the light emitting unit side is mounted on the circuit board;

FIG. 12 is an explanatory view of a smoke detection section assembly of the present invention in which a circuit board on a light emitting section side is separated from a hybrid circuit board on a light receiving section side;

13 is a circuit diagram of the light emitting circuit board of FIG.

FIG. 14 is an explanatory view of a thin mounting base used in the present invention.

FIG. 15 is an explanatory view of a terminal block mounted on the mounting base of FIG. 14;

FIG. 16 is an explanatory view of a terminal block with an alarm indicator light mounted on the mounting base of FIG. 14;

FIG. 17 is an explanatory view of a polygonal mounting base used in the present invention.

FIG. 18 is an explanatory view of another embodiment of the polygonal mounting base used in the present invention.

19 is an explanatory diagram of a fitting state of the polygonal mounting base and the outer cover of FIG.

FIG. 20 is an enlarged explanatory diagram of an insect repellent net used in the present invention.

FIG. 21 is a sectional view of a conventional photoelectric smoke detector.

FIG. 22 is a plan view of the internal structure of FIG. 21;

FIG. 23 is an explanatory view of the arrangement of the light emitting unit and the light receiving unit of FIG.

FIG. 24 is an exploded view of the conventional apparatus of FIG. 21;

FIG. 25 is an explanatory view of a conventional mounting base.

[Explanation of symbols]

10: photoelectric smoke detector 11: outer cover 12: insect screen 14: smoke detector 15: smoke detector body 16: smoke detector assembly 18: nameplate seal 20: mounting base 22: smoke inflow window 24: display hole 25: Base 26: Peripheral wall 28: Opening 30: Light receiving section holder 32: Light emitting section holder 34: Assembly arm 36, 136: Hybrid circuit board 38: Light emitting element (infrared LED) 40: Light receiving section 40-1: Lens section 42 : Integrated circuit 43: Light receiving element 44-1 to 44-4: Fitting piece 45, 122, 130: Wiring through hole 46-1, 46-2: Terminal unit 48: Alarm display lamp 50-1, 50-2 : Lead metal fittings (first lead metal fittings) 52-1 and 52-2: Lead metal fittings (second lead metal fittings) 54-1 to 54-3: Fitting claws 56-1 and 56-2: Leads 58-1 and 58. -2: Base contact Part 60: Opening 62: Chip component 66: Coating layer 68: Rectification / noise absorption circuit 70: Fire signal output circuit 72: Constant voltage / current limiting circuit 74: Oscillation circuit 76: Counter circuit 78: Amplification circuit 80: Comparison circuit 82 , 84: D-FF 86: lens unit 88: light emitting element 90: light guide 92: light emitting lens 96: light emitting circuit board 100: sensor contact portion 101-1, 101-2, 119-1, 119-2, 132-1, 132-2: mounting screw thread Holes 102-1 and 102-2: Lead wire insertion holes 104: Terminal fittings 106-1 and 106-2: Lead wire contact portions 108: Connection portions 110: Resistance connection portions 112: Alarm display lamp connection portions 114: Resistance 116 : Cutting part 118, 124: Polygon mounting base 120-1 to 120-4, 126-1, 126-2, 128-1, 128-2: Fitting piece 134-1, 134-2: Mounting hole 136-1 to 136-4: Fitting piece

Claims (4)

[Claims] 1. A sensor mounting base fixed to a ceiling surface or the like and electrically and mechanically holding a fire detector in a detachable manner, which is formed by processing a metal plate. A thin base main body substantially housed in the cover; a plurality of fitting pieces integrally formed on the periphery of the base main body to fit the sensor side; and at least a sensor fixed to the sensor mounting surface of the base main body. A sensor contact base, a pair of terminal blocks provided with lead wire insertion holes and molded with an insulating resin material. 2. The sensor mounting base according to claim 1, wherein said terminal block having no alarm indicator is divided into said sensor contact portion and a lead wire contact portion, and a sheet metal connected between the two. A sensor mounting base, wherein a conductive terminal fitting having a processed shape is covered with a member molded with an insulating resin material. 3. The sensor mounting base according to claim 1, wherein the terminal block provided with the alarm indicator light disconnects the connection between the sensor contact portion and the lead wire contact portion and between the two. A sensor mounting base characterized in that a conductive terminal fitting having a sheet metal processing shape connected to an alarm indicator light is covered with a member molded with an insulating resin material. 4. The sensor mounting base according to claim 1, wherein the base main body has a wiring through hole in the center and a pair of mounting screw through holes provided with cutouts around the center. A sensor mounting base characterized by being provided.