JPH11312281A - Photoelectric smoke detector - Google Patents

Abstract

(57) [Problem] To prevent the intrusion of noise from the lead wire of the light receiving element and to reduce the number of parts without changing the structure of the smoke detecting section including the light receiving section holder. A light receiving IC unit (20) in which a light receiving element (27) and at least an integrated circuit on which a light receiving signal amplifying circuit (66) is mounted is resin-molded in a light receiving part holder (17) of a smoke detector (13), and is housed in a layered direction (vertical direction). Light receiving IC unit 20
Is fixedly connected to the circuit board 8 in the circuit accommodating section 12 from the hierarchical direction (vertical direction). The light receiving IC unit 20 has the same size as the light receiving element mounted alone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting section in which a circuit accommodating section and a smoke detecting section are arranged in a hierarchy, a circuit board on which a sensor circuit is mounted in the circuit accommodating section, and a light emitting element is provided in the smoke detecting section. Arrange the light receiving unit holder with holder and light receiving element,
The present invention relates to a smoke detector for detecting a fire by receiving, with a light receiving element, scattered light of light from a light emitting element due to smoke flowing into a smoke detection section.

[0002]

2. Description of the Related Art A conventional photoelectric smoke detector is disclosed, for example, in JP-A-63-163698 shown in FIG. In FIG. 8, the main body cover 101 of the photoelectric smoke detector is provided.
The inside has a hierarchical structure separated by a base 105 into a circuit storage section 101a and a smoke detection section 104. The base 105 is attached to the smoke detector 104 located on the lower side in the installation state with respect to the ceiling surface.
Light-emitting unit holder 106 and light-receiving unit holder 107
Are arranged, the light emitting element 108 is accommodated in the light emitting unit holder 106, and the light receiving element 109 is accommodated in the light receiving unit holder 107.

The light emitting element 108 and the light receiving element 109 are arranged so that the optical axis thereof is shifted by a predetermined angle when viewed in a plane, and scattered light of the light emitted from the light emitting element 108 due to smoke flowing into the smoke detection section 104 is received. To detect fire. A circuit board 115 composed of a double-sided board is provided in the circuit storage section 101a located above the smoke detection section 104, and a light emitting element 108 and a light receiving element 10 arranged in the smoke detection section 104 are provided on the lower side.
9 are mounted, and other electric components 16 are mounted on the upper surface side in the form of chips.

[0004]

However, in such a conventional photoelectric smoke detector, the light receiving element 109 is not provided.
8 is housed in the light receiving unit holder 107 and mounted on the circuit board 115 by a lead wire, so that there is a problem that the influence of external noise is likely to occur when a weak light receiving signal flows through the lead wire. Therefore, a metal shield case is mounted in the light receiving unit holder 107. Also,
Most of the electrical components 16 mounted on the circuit board 115 are reduced in size as chip components, and the number of components is reduced by optimizing the circuit design. However, further reduction in size and reduction in the number of components are required. There was a limit.

To solve such a problem, there is a photoelectric smoke detector disclosed in Japanese Patent Laid-Open No. 4-117597 shown in FIG. In the photoelectric smoke detector of FIG. 9, an integrated circuit 207 including a light receiving element composed of a photodiode, a smoke detection circuit, a light emitting element driving circuit, and a power supply circuit is surface-mounted on a circuit board 205, The base 202 is a light emitting element 203
The light receiving lens 208 is integrally provided with a prism part 208a and a lens part 208b for condensing the scattered light in the smoke detector 211 from the surface to a light receiving element in the integrated circuit 207 surface-mounted.

By incorporating the light receiving element into the integrated circuit 207 surface-mounted on the circuit board in this way, there is almost no possibility that external noise enters the lead wires of the light receiving element, and the light receiving element and the smoke detection By incorporating the circuit, the light emitting element drive circuit, and the power supply circuit into an integrated circuit, the number of components has been greatly reduced. However, in the photoelectric smoke detector of FIG. 9, the circuit boards 20 arranged in a hierarchy are arranged.
The scattered light from the smoke detector 211 must be collected on the light receiving element in the integrated circuit 207 surface-mounted on the smoke detector 211 by a special condenser lens 208 integrating the prism part 208a and the lens part 208b. In addition to the necessity of the optical lens 208, high-precision alignment is required to collect the scattered light on the light-receiving element in the integrated circuit 207, and therefore, the precision of the components must be increased.

Further, despite the improvement of the electric circuit for preventing the intrusion of noise from the lead terminals of the light receiving element, as apparent from the comparison with FIG. 8, the smoke detection section including the light receiving section holder. Since the structure of 211 has to be changed significantly, there has been a problem that the development period is lengthened and the cost is increased as a result. SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and it is possible to prevent noise intrusion from a lead wire of a light receiving element and a component without substantially changing the structure of a smoke detecting unit including a light receiving unit holder. It is an object of the present invention to provide a photoelectric smoke detector capable of reducing the number of points.

[0008]

In order to achieve this object, the present invention is configured as follows. First, in the present invention, a circuit storage section and a smoke detection section are hierarchically arranged, a circuit board on which a sensor circuit is mounted is incorporated in the circuit storage section, and a light emission section holder having a light emission element in the smoke detection section and a light reception element are provided. A light-receiving unit holder is disposed, and a photoelectric smoke detector for detecting a fire by receiving light scattered from a light-emitting device due to smoke flowing into a smoke detection unit by the light-receiving device.

According to the present invention, such an photoelectric smoke detector is provided with an integrated circuit unit in which a light receiving element and an integrated circuit on which at least a light receiving signal amplifying circuit is mounted are resin-molded in a light receiving section holder in a layer direction (vertical direction). Direction),
The terminal of the integrated circuit unit is connected and fixed to the circuit board in the circuit accommodating portion from the hierarchical direction (vertical direction). Here, the integrated circuit unit has the same size as a single light receiving element mounted on an integrated circuit.

As described above, according to the present invention, an integrated circuit unit having at least a light-receiving signal amplifying circuit mounted thereon in addition to the light-receiving element is housed in a light-receiving section holder arranged in the smoke detection section from a hierarchical direction and integrated. By connecting and fixing the terminals of the circuit unit to the circuit board in the circuit storage section from the layer direction,
It is basically unnecessary to change the structure of the light receiving unit holder arranged in the smoke detection unit.

In addition, although there are terminals, since the signal is an amplified signal after the amplifier circuit, unlike a weak light receiving output as in the prior art, there is almost no influence on external noise. In addition, similar to the conventional light receiving element, a condenser lens is molded in the package of the integrated circuit unit itself, eliminating the need for a separate condenser lens with a special condenser path, and positioning the optical lens with high precision. It can be easily realized.

The integrated circuit unit housed in the light receiving unit holder includes a light detecting element, an amplifying circuit, a smoke detecting circuit,
A light emitting oscillation circuit may be mounted on the integrated circuit. In addition, the integrated circuit unit, in addition to the light receiving element and the amplification circuit,
A smoke detection circuit, an oscillation circuit for light emission, and a power supply circuit may be mounted on an integrated circuit. This reduces the number of components mounted on the circuit board as much as possible.

As an oscillation circuit for driving light emission mounted on the integrated circuit unit, a circuit excluding a switching transistor for driving a light emitting element is mounted. If the switching transistor for driving light emission is incorporated in an integrated circuit, it becomes a noise source. Therefore, the switching transistor for driving light emission is mounted on a circuit board.

[0014]

FIG. 1 is an exploded view of a photoelectric smoke detector according to the present invention. First, a cup-shaped outer cover 1 is located on the lower side with a photoelectric smoke detector installed on a ceiling or the like, and a plurality of smoke inlets 2 are opened around the outer cover. On the other hand, the terminal board 3 is arranged on the side where the sensor base is fixed to the ceiling surface side. The smoke detection unit main body 5 is fixed to the lower side of the terminal board 3 via a packing 7.

The terminal board 3 and the smoke detection section main body 5 are fixed by passing a screw 10 from below the smoke detection section main body 5, penetrating the terminal board 3 and screwing into the upper fitting 9. With the smoke detection section main body 5 attached to the lower side of the terminal board 3, a circuit storage section is formed therebetween, and the shield case 4 and the circuit board 8 are incorporated in the circuit storage section. A smoke detector cover 11 is detachably attached to the lower side of the smoke detector main body 5. A plurality of labyrinth members are formed inside the peripheral wall of the smoke detection unit cover 11, and an insect net 14 is integrally provided outside the labyrinth member. By attaching the smoke detector cover 11 to the lower side of the smoke detector main body 5, a smoke detector is formed inside the smoke detector cover 11.

A light emitting unit holder base 16a, a light receiving unit holder base 17a, and a light shielding plate 18 are integrally formed below the smoke detecting unit main body 5 serving as a smoke detecting unit. A light emitting element 21 using an infrared LED or the like is inserted into the light emitting unit holder base 16a, and a lead terminal is connected to the circuit board 8 by soldering. In a state where the light emitting element 21 is housed, the light emitting unit cover 16b is attached to the light emitting unit holder base 16a.
Is attached.

A light receiving integrated circuit unit (hereinafter referred to as "light receiving IC unit") 20 is accommodated in a light receiving unit holder base 17a integrally formed below the smoke detecting unit main body 5, and leads of the light receiving IC unit 20 are provided. The terminals are connected by soldering to the circuit board 8 in the circuit housing located on the upper side. When the light receiving IC unit 20 is housed, the light receiving unit holder base 17a and the light receiving unit holder cover 17b
Attach.

In this embodiment, the shield cap 22 is mounted inside the light receiving section holder cover 17b. However, there is no problem even if the shield cap 22 is omitted. Further, a test light emitting element 28 using an infrared LED is housed in the light receiving section holder base 18a. FIG. 2 is a sectional view of the photoelectric smoke detector according to the present invention, corresponding to the exploded view of FIG. Inside the outer cover 1, the terminal board 3, the smoke detection unit main body 5, and the smoke detection unit cover 11 are attached to form a circuit storage unit 12 on the upper side and a smoke detection unit 13 on the lower side. The shield case 4 is fixed on the upper side of the circuit housing portion 12, and the circuit board 8 is fixed on the lower side.

The smoke detector 13 is provided with a light emitting unit holder 16 and a light receiving unit holder 17. The light emitting element 21 is housed in the light emitting section holder 16 and the lead terminals are connected to the upper circuit board 8.
And soldered in place. The light receiving unit holder 17 houses a light receiving IC unit 20. The light-receiving IC unit 20 has a condenser lens 24 integrally molded on the light-receiving side of a resin-molded package body 23 as shown at the lower left, and six light-receiving ICs in this embodiment. Lead terminals 25 are taken out. As is apparent from the cross-sectional view of the storage state with respect to the light receiving unit holder 17 inside the light receiving IC unit 20,
The C chip 26 is incorporated, and a light receiving element 27 and a circuit pattern of at least a light receiving signal amplifying circuit provided in a light receiving circuit portion to be described later are formed on the chip surface of the IC chip 26. The light receiving element 27 is disposed at a focal position on the optical axis behind the condenser lens 24 integrally formed by molding.

The light receiving IC unit 20 includes the light receiving section holder 1
7, the circuit board 12 and the smoke detector 13 are stored in the layer direction, that is, in the vertical direction. The lead terminals 25 of the light receiving IC unit 20 are also taken out in the vertical direction, which is the layer direction. 8 is fixed by soldering while penetrating the through hole. FIG. 3 shows a light emitting unit holder 16 and a light receiving unit holder 17 provided in the smoke detection unit 13 of FIG. The light emitting element 21 housed in the light emitting unit holder 16 emits light in the direction of the optical axis 21a. With respect to the light-emitting side optical axis 21a,
The light receiving unit holder 17 is arranged in a direction having an intersection angle of 70 ° by the optical axis 27a. A light-shielding plate 18 is disposed between the light-emitting unit holder 16 and the light-receiving unit holder 17 to prevent light from directly entering the light-receiving element 17 toward the light-receiving unit holder 17.

The light receiving unit holder 17 has a first aperture unit 30 opened on the incident side of the scattered light, and the light receiving IC unit 2
, And collects the scattered light that has entered through the condenser lens 24 integrated with the mold.
The light is condensed on the light receiving element 27 arranged on the light receiving element 6. In addition, a partition plate 32 is disposed in front of the light receiving unit holder 17, and a second throttle unit 31 is opened in the partition plate 32 to prevent the incidence of noise light reflected on the inner wall of the smoke detection unit. Further, in this embodiment, the test light emitting element 28 is housed in the light receiving section holder 17, and the test light emitting element 28 emits test light corresponding to the scattered light when the smoke flows in to perform pseudo sensing. Equipment test.

FIG. 4 is a block diagram of a detector circuit provided in the photoelectric smoke detector of the present invention. The sensor circuit has terminals L and C to which a sensor line serving as a power / signal line from the receiver is connected, and a rectification noise absorbing circuit 50 using a diode bridge is provided following the terminals L and C. . Subsequently, an output circuit 52 is provided, and further, a constant voltage circuit 54 and a current limiting circuit 56 serving as a power supply circuit are provided.

Next, an oscillating circuit 58 for light emission is provided, and an oscillating pulse from the oscillating circuit 58 is applied to a light emitting section 62 via a driving circuit 60. The driving circuit 60 includes an oscillation circuit 58
And a switching transistor that is turned on and off by an oscillation pulse from the switch. The light emission drive pulse from the drive circuit 60 using the switching transistor is supplied to a light emitting element provided in the light emitting unit 62, for example, an infrared LED,
Light emission driving is performed intermittently. The drive circuit 60 receives power supply from the current limiting circuit 56, and an electrolytic capacitor 80 is connected to this power supply line.

The light receiving section 64 receives scattered light due to the inflow of light smoke from the light emitting section 62. The weak light receiving signal received by the light receiving section 64 is amplified by the amplifier circuit 66 and provided to the comparison circuit 68. A predetermined threshold value is set in the comparison circuit 68. When the light receiving signal from the amplification circuit 66 exceeds this threshold value, a comparison output is generated to the counting circuit 70. The counting circuit 70 counts continuous comparison outputs from the comparison circuit 68, and outputs the count output to the output circuit 52 when, for example, two comparison outputs are continuously obtained. Comparison circuit 68
The counting circuit 70 constitutes a smoke detection circuit. The output circuit 52 receiving the output from the counting circuit 70 short-circuits the terminals L and C to a low impedance by turning on a switching element such as a thyristor, causing a fire current to flow through the alarm current from the receiver to the detector line. Outputs a detection signal.

With respect to such a photoelectric smoke detector circuit, in this embodiment, the light receiving section 64 and the amplifier circuit 66 are used.
Is the IC circuit section 72, and the IC circuit section 72 is the light receiving IC unit 20 housed in the light receiving section holder 17 of FIG.
Is incorporated as an IC circuit. The circuit units other than the light receiving unit 64 and the amplifier circuit 66 are mounted on the circuit board 8 housed in the circuit housing unit 12.

Next, the operation of the photoelectric smoke detector of the present invention using the IC circuit section 72 shown in FIG. 4 will be described. When power is supplied between the terminals L and C by connection to the detector line from the receiver, each circuit unit is activated by receiving power from the constant voltage circuit 54. That is, the oscillating circuit 58 oscillates at a predetermined frequency and supplies an oscillating pulse to the driving circuit 60. The light emitting element of the light emitting section 62 is driven to emit light by turning on the switching transistor, so that light for smoke detection is intermittently transmitted to the smoke detecting section. Output.

When smoke due to a fire flows into the smoke detector, light scattered by the smoke of the light from the light emitter 62 is incident on the light receiver 64 to generate a weak light output. The received light output is amplifying circuit 66
After being amplified by the comparator circuit 68 constituting a smoke detection circuit,
The counting circuit 70 detects a fire. Specifically, the amplified light reception output is compared with a predetermined threshold value by the comparison circuit 68, and when the threshold value is exceeded, the counter circuit 70 generates a comparison output to perform the counting operation. When the comparison output from the comparison circuit 68 is continuous, for example, twice, the counting circuit 70 outputs the signal.
A fire detection signal is output to the receiver by turning on a switching element such as a thyristor of No. 2 and short-circuiting the terminals L and C to a low impedance and causing an alarm current to flow.

At this time, the light receiving output from the light receiving section 64 is a very weak signal and is easily affected by noise. However, in the present invention, the light receiving section 64 is used as the IC circuit section 72 together with the amplifier circuit 66, for example, as shown in FIG.
7, a light receiving section 64 is provided as a light receiving element 27 on the IC chip 26, and an amplifying circuit 66 for amplifying the light receiving output of the light receiving element 27 is provided on the IC chip 26. Is provided, so that external noise hardly enters the weak light receiving output of the light receiving element 27.

For this reason, the light receiving IC unit 20 shown in FIG.
The light-receiving signal amplified by the amplifier circuit 66 in FIG. 4 is output to the lead terminal 25 taken out from the device, and since the amplified light-receiving signal has a sufficient level,
The S / N ratio is hardly degraded even if the noise enters, and the comparison circuit 68 at the next stage can accurately judge the light receiving signal and the threshold value without being affected by the noise.

In the case of FIG. 4, in addition to the light-receiving elements of the light-receiving section 64, the light-receiving IC unit 20 housed in the light-receiving section holder 17 as the IC circuit section 72 also includes the amplifier circuit 66.
Therefore, it is not necessary to mount the amplifier circuit 66 on the circuit board 8 provided in the circuit storage section 12 in FIG. 2, and the number of components can be reduced, and the size and cost can be reduced. .

FIG. 5 shows another embodiment of the light receiving circuit used in the photoelectric smoke detector of the present invention. In this embodiment, in addition to the light receiving section 64 and the amplification circuit 66, the IC circuit section 74 also includes a detector circuit section including a smoke detection circuit (comparison circuit 68 and counting circuit 70) and an oscillation circuit 58. It is characterized in that it is included. In this case, the oscillation circuit 5
In the drive circuit 60 using the switching transistors constituting the output stage of No. 8, when included in the IC circuit section 74, large noise is generated by the switching of the light emission pulse, which adversely affects each circuit section on the light receiving side. The circuit 60 is removed from the IC circuit section 74 and mounted on the circuit board side.

As described above, the light receiving section 6 is used as the IC circuit section 74.
By including the sensor circuit section from 4 to the oscillation circuit 58, the number of components mounted on the circuit board 8 side can be further reduced, and the cost can be further reduced. Further, as shown in FIG. 6, in addition to FIG.
And the current limiting circuit 56 may be included in the IC circuit section 76. In the case of the IC circuit section 76 including the power supply circuit section as shown in FIG. 6, most circuits of the sensor circuit section are incorporated in the light receiving IC unit 20 as an integrated circuit, and the circuit board incorporated in the circuit housing section 12 8 requires only a few circuit parts such as a rectified noise absorption circuit 50, an output circuit 52, and a drive circuit 60 to be mounted.

For example, the number of components mounted on the circuit board 8 can be reduced to several points such as a diode bridge of the rectified noise absorbing circuit 50, a thyristor of the output circuit 52, a switching transistor of the drive circuit 60, and an electrolytic capacitor 80. Of course, when the IC circuit section 76 including the power supply circuit section as shown in FIG. 6 is used, the chip area of the IC circuit is somewhat larger than that in FIGS. 4 and 5, but as apparent from FIGS. In addition, the storage space of the light receiving unit holder 17 is limited on the smoke detection unit 13 side where the scattered light is incident and on the height direction, but there is a sufficient margin in the horizontal direction and behind, and the built-in IC chip 26 becomes large. But it can be enough.

FIG. 7 shows another embodiment of the light receiving IC unit 20 used in the photoelectric smoke detector of the present invention. In this embodiment, the circuit board 8 is directly used without using lead terminals. And a mounting process similar to that of the chip component. That is, in the light receiving IC unit 20 of FIG. 7A, the package main body 23 has a height in which the upper portion directly contacts the lower surface of the circuit board 8 in the housed state with respect to the light receiving section holder 17 of FIG. The number of chip terminals 34 corresponding to the number of lead terminals 25 on the side surface
Is provided.

With respect to the light receiving IC unit 20 having this structure, the chip terminals 34 are applied to the circuit board 8 and a mounting process using the same solder flow as that for soldering the chip components to the circuit board is performed. The light receiving IC unit 20 is electrically and mechanically connected.
It may be stored in the light receiving unit holder 17 arranged in the smoke detection unit 26 as described above.

Further, in order to mount the light receiving IC unit 20 on the circuit board 8 with high accuracy in consideration of the light receiving position and the like,
As shown in FIG. 7B, the terminals 34a at both ends may be formed in a lead shape, mounted on the circuit board 8 and positioned. Alternatively, the protrusions of the mold may be integrally formed, and the protrusions may be fitted into holes provided in the circuit board 8 for positioning.

Note that the present invention is not limited to the above-described embodiment, and any other structure may be used as long as the circuit housing section and the smoke detecting section are arranged in a hierarchy and the light emitting section holder and the light receiving section holder are arranged in the smoke detecting section. It can be applied as it is to the photoelectric smoke detector.

[0038]

As described above, according to the present invention, an integrated circuit unit having at least a light-receiving signal amplifying circuit mounted thereon in addition to a light-receiving element is housed in a light-receiving section holder arranged in a smoke detection section, and an integrated circuit is provided. The terminal of the unit is placed in the layer direction (vertical direction) with respect to the circuit board of the circuit storage section
By connecting and fixing from the conventional, without changing the structure of the light receiving unit holder placed in the smoke detection unit, it is possible to store the integrated circuit unit mounted with the light receiving element and its amplification circuit,
A signal obtained by amplifying the received light signal is output from the terminal of the integrated circuit unit, so that there is almost no effect on external noise, and a photoelectric smoke detector that is structurally simple and resistant to noise can be realized.

In the integrated circuit unit, the condenser lens is molded in the package itself, so that the positioning with respect to the smoke detection section can be easily performed with high precision without requiring a separate condenser lens having a special condenser path. Since no precision is required for the components, sufficient cost reduction can be realized. The integrated circuit unit housed in the light receiving unit holder includes at least a light receiving element and an amplification circuit. In addition to this, a smoke detection circuit, an oscillation circuit for driving light emission, and a power supply circuit unit are also mounted, so that the circuit board side is mounted. The number of components to be mounted on the device can be greatly reduced, and the reduction in the number of components leads to downsizing and cost reduction.

Furthermore, the drive circuit using the switching transistor for driving the light emission is provided on the circuit board, not on the integrated circuit unit side, so that the mounting of the power element on the integrated circuit is avoided, and the noise due to the power element is avoided. Contamination can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an exploded view of a photoelectric smoke detector according to the present invention.

FIG. 2 is a sectional view showing a photoelectric smoke detector according to the present invention together with a light receiving IC unit.

FIG. 3 is a sectional view of the light emitting unit holder and the light receiving unit holder of FIG.

FIG. 4 is a circuit block diagram of a detector circuit unit included in the light receiving IC unit of the present invention.

FIG. 5 is a circuit block diagram of another sensor circuit section included in the light receiving IC unit of the present invention.

FIG. 6 is a circuit block diagram of another sensor circuit section included in the light receiving IC unit of the present invention.

FIG. 7 is an explanatory view of another embodiment of the package structure of the light receiving IC unit according to the present invention.

FIG. 8 is an explanatory view of a conventional example of a photoelectric smoke detector.

FIG. 9 is an explanatory view of another conventional example of a photoelectric smoke detector.

[Explanation of symbols]

 1: Outer cover 3: Terminal board 5: Smoke detection unit main body 8: Circuit board 11: Smoke detection unit cover 12: Circuit storage unit 13: Smoke detection unit 16: Light emitting unit holder 17: Light receiving unit holder 18: Light shielding plate 20: Light receiving integrated circuit unit (light receiving IC unit) 21: Light emitting element 23: Package body 24: Condensing lens 25: Lead terminal 26: IC chip 27: Light receiving element 28: Light emitting element for test 50: Rectifying noise absorption circuit 52: Output circuit 54: constant voltage circuit 56: current limiting circuit 58: oscillation circuit 60: drive circuit 62: light emitting section 64: light receiving section 66: amplifier circuit 68: comparison circuit 70: counting circuit 72, 74, 76: IC circuit section 80: electrolysis Capacitors

Claims (6)

[Claims] 1. A light-emitting unit holder and a light-receiving element, wherein a circuit housing and a smoke detector are arranged in a hierarchy, a circuit board on which a sensor circuit is mounted in the circuit housing, and a light-emitting element is provided in the smoke detector. In the smoke detector that detects a fire by receiving the scattered light of the light from the light emitting element due to the smoke flowing into the smoke detector by the light receiving element, wherein the light receiving section holder includes: An integrated circuit unit in which the light receiving element and an integrated circuit on which at least a light receiving signal amplifying circuit is mounted are resin-molded, and an integrated circuit unit is housed in a layered direction, and terminals of the integrated circuit unit are connected and fixed to a circuit board in the circuit housing part in a layered direction. A photoelectric smoke detector characterized by the following. 2. The photoelectric smoke detector according to claim 1, wherein:
The photoelectric circuit according to claim 1, wherein the integrated circuit unit has the same size as the light receiving element mounted alone. 3. The photoelectric smoke detector according to claim 1, wherein
A photoelectric smoke detector, wherein a condenser lens is integrally molded with the package of the integrated circuit unit. 4. The photoelectric smoke detector according to claim 1, wherein:
The photoelectric smoke detector according to claim 1, wherein the integrated circuit unit further includes a smoke detection circuit and a light emission oscillation circuit mounted on the integrated circuit in addition to the light receiving element and the amplification circuit. 5. The photoelectric smoke detector according to claim 1, wherein:
The photoelectric smoke sensor according to claim 1, wherein the integrated circuit unit further includes a smoke detection circuit, a light emission oscillation circuit, and a power supply circuit mounted on the integrated circuit in addition to the light receiving element and the amplification circuit. 6. The photoelectric smoke detector according to claim 4, wherein the integrated circuit unit includes a circuit excluding a switching transistor for driving the light emitting element as the light emitting oscillation circuit. A photoelectric smoke detector characterized by being mounted on a device.