JP3205491B2 - How to adjust the installation position of the scanning fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the installation position of a fire detector in which a horizontal installation position of a scanning fire detector is adjusted using a visible light laser emitting device.

[0002]

2. Description of the Related Art Conventionally, in order to monitor a fire in a large-scale building such as a sports facility or a convention center, two-dimensional scanning of a wide monitoring area is performed to detect radiant energy from a flame generated by the fire and to cause a fire. A scanning fire detector that outputs a signal and a fire source position signal is used.

[0003] As a scanning fire detector (hereinafter simply referred to as a fire detector), there is known a mirror scanning radiation detector disclosed in Japanese Patent Application Laid-Open No. 62-255832. FIG. 9 shows a schematic configuration of this fire detector. A rotating mirror 3 is rotated by a vertical scanning motor 2 mounted on a housing 1. The rotating mirror 3 reflects an object optical image incident from a monitoring area 6 toward a reflecting mirror 4, and further reflects a reflecting mirror. The optical image of the subject reflected at 4 is received by the photoelectric conversion element 5. Although not shown, the reflection mirror 4 and the photoelectric conversion element 5
Only the light that has passed through the slit provided between them is received by the photoelectric conversion element 5, so that the area of each scanning area is defined.

The detection operation is to scan the monitoring area 6 in the vertical direction Y by rotating the rotating mirror 3 at a predetermined angular velocity, and each time one scan in the vertical direction Y is completed, the horizontal direction is changed by a predetermined rotation angle. The housing 1 is rotated to X by a horizontal scanning stepping motor (not shown). Each scanning area, which finely divides the monitoring area 6, is sequentially scanned by the rotating mirror 3, and the photoelectric conversion element 5 photoelectrically converts the scanning area into a detection signal corresponding to the intensity of radiant energy. By comparing and judging with the above, it is judged in which scanning area in the monitoring area 6 a fire has occurred.

[0005] The position of each scanning area obtained by subdividing the monitoring area is represented by a horizontal scanning angle θ and a vertical scanning angle α with respect to the start position of scanning by the fire detector. The position (θ, α) of the section, that is, the fire source position is calculated and output from the time from the start position of the horizontal scanning motor and the vertical scanning motor, the number of steps, and the like. In addition,
The fire detector is, for example, θ = 0 to 180 degrees in the horizontal direction,
Scanning is performed in the vertical direction within a range of α = 0 to 90 degrees.

By the way, such a monitoring area or a scanning section is determined by data of a design drawing before a building is completed.
A system including a fire detector will be manufactured. Therefore, when the fire detector 1 is installed at a predetermined position when a wall is formed, the reference position of the actual monitoring area of the building and the start position of the scanning of the fire detector are made to coincide with each other, and the range of the monitoring area of the building and the fire It must match the scanning range of the detector. If the fire source is detected in a non-coincidence state, the calculated fire source position (θ, α) and the actual position of the fire source will be shifted. As a result, the shifted fire source position information Therefore, when the fire source position is displayed on the CRT, the display position is shifted, and when the water is discharged to the fire source position with a water spray gun, the water is discharged to the off-site, so when the fire detector is installed in the building, We are adjusting the installation position of the fire detector so that the reference position of the actual monitoring area of the building coincides with the start position of the scan by the fire detector.

A method for adjusting the installation position of a conventional scanning fire detector will be described with reference to FIG. For the adjustment, first, the fire detector 1 is installed at a predetermined position in the building. At the time of installation, the fire detector 1 is adjusted to be horizontal by a level so as to eliminate the displacement in the vertical direction. In this installation state, the horizontal range θ of the actual monitoring area of the building and the horizontal scanning range θ 'of the fire detector do not match, and they are shifted by △ θ in the horizontal direction as shown in the figure. Next, the installation position of the fire detector is adjusted so as to eliminate this displacement. A gas stove 8 serving as a simulated fire source is placed at a simulated fire source position 7 determined in advance. The simulated fire source position 7 is determined based on a result obtained by reading a predetermined horizontal angle θ1 and a vertical angle α1 from a preset reference position of the monitoring area 6 from a design drawing of a building and measuring the same. Next, the fire detector 1 is started, and the horizontal scanning is driven by the horizontal angle θ1 from the position of the horizontal scanning start position (θ ′ = 0 °) by manual scanning. The horizontal scanning drive by manual scanning may be performed by inputting the horizontal angle θ1 itself to the drive control unit, for example, or may be performed by calculating the number of steps of the horizontal scanning stepping motor corresponding to the horizontal angle θ1. You may enter the number of steps. In the state after driving, since the fire detector 1 is directed in the direction of the line 9, the gas stove 8 is ignited so as to be directed in the direction of the simulated fire source position 7, and is displayed on the screen of a display device such as a CRT. While monitoring the analog value of the received light amount, the fire detector 1 itself is moved in the horizontal direction to the position where the analog value becomes the highest, and the fire detector itself is fixed at the horizontal angle position where the analog value becomes the maximum value. . By this adjustment, the reference position of the monitoring area and the start position of the horizontal scanning of the fire detector coincide, that is, the range of the actual monitoring area and the scanning range of the fire detector coincide.

However, in the method of adjusting the installation position of the fire detector, the direction of the mirror 3 of the fire detector 1 coincides with the position where the heat energy radiated from the flame of the gas stove 8 becomes maximum. The fire detector 1 itself is rotated and adjusted to the installation position. However, the flame of the gas stove 8 is not a spot but a certain width, for example, a gas stove 8 having a width of 1 m × 50 cm is placed on a table. It is difficult to adjust the installation position of the fire detector 1 so as to match the direction of the simulated fire source position 7, which is the spot that was previously aimed, due to the use of the fire detector and the fluctuation of the flame caused by the wind. A shift was to occur between the reference position of the monitoring area and the start position of the horizontal scanning of the fire detector 1. In addition, the fire detector 1 must be rotated while preparing the gas stove 8 and monitoring the analog value of the received light amount, and the adjustment work is complicated.

As a method for adjusting the horizontal position of the fire detector to solve such a problem, there is a method disclosed in Japanese Patent Application Laid-Open No. 5-1948 filed by the present applicant. In FIG. 11, a scanning fire detector 1 is provided with a light emitting device 120 for emitting a highly linear visible light, for example, visible laser light, in front of a detection window 110 of the detector housing 10. The visible laser light 6 emitted from the light emitting element 130 such as a semiconductor laser in the inside is emitted to the rotating mirror 3 so that the visible laser light 6 is reflected by the rotating mirror 3 and the emission line 7 of the visible laser light 6 is You can do it. As shown in FIG. 12, the adjustment work is performed by first setting the pillar 300 serving as a reference target at a position of a predetermined horizontal scanning angle from the reference position of the monitoring area 6, and then setting the fire detector to the same predetermined horizontal scanning. The horizontal scanning is stopped at that horizontal scanning angle, and the base 200 is rotated and adjusted so that the bright line 7 of the visible laser light 6 reflected by the rotating mirror 3 passes through the center of the column in that state. The reference position of the actual monitoring area of the building and the start position of the horizontal scanning of the fire detector are made to match.

[0010]

However, in such a method for adjusting the installation position of the scanning fire detector, the light emitting device 120 for emitting visible light is mounted on the detector housing 1.
Since the light emitting device 120 must be fixed to the front of the detection window 110, the use of a semiconductor laser that is optimal as the light emitting device 120 causes a problem that the fire detector 1 itself becomes large and costs increase. In addition, the pillar 300 must be set up in the monitoring area 6 at the time of adjustment, and there is a problem that the operation is complicated, and the practice has not been implemented.

[0011]

In order to achieve this object, the present invention is configured as follows. The scanning fire detector to which the present invention is directed is a method for detecting radiant energy from a monitored area obtained by scanning a monitored area horizontally in steps and scanning each horizontal direction vertically with a rotating mirror. This is a scanning fire detector that determines a fire based on a signal.

According to the present invention, as a method for adjusting the installation position of the scanning fire detector, a predetermined horizontal angle from a reference position of the monitoring area where the scanning fire detector is to be installed in the monitoring area is provided. The visible light laser emitting device is installed at the position of θ1, and the visible laser light is emitted from the visible light laser emitting device to the scanning fire detector that is horizontally scanned by a predetermined horizontal angle θ1 from the horizontal scanning start position. The scanning fire detector body is illuminated so that the emission line of the visible laser light reflected by the rotating mirror of the scanning fire detector that irradiates the monitoring area overlaps the optical axis of the visible light laser emitting device. Rotate horizontally to adjust the installation position.

[0013] Further, a flange having a circular section having an L-shaped cross section and a circular hole into which the scanning fire detector body is inserted is formed at the tip of the horizontal portion, and a mounting stand for attaching the vertical portion to a wall; A ring member which is held at a predetermined interval on the upper side, and rotatably mounts and fixes the scanning fire detector main body in the horizontal direction. The scanning fire detector main body is placed on the ring member so that the bright line by the reflected light of the visible laser light reflected by the rotating mirror of the scanning fire detector irradiates the optical axis of the visible light laser emitting device. Rotate horizontally to adjust the installation position.

[0014] Therefore, the scanning fire can be easily and accurately matched with the reference position of the actual monitoring area of the building and the start position of the horizontal scanning of the scanning fire detector without standing up the pillar as in the prior art. The installation position of the detector main body can be adjusted.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram for explaining a method for adjusting the installation position of a scanning fire detector according to the present invention. In FIG. 1, reference numeral 11 denotes a scanning fire detector (hereinafter referred to as a fire detector). The fire detector 11 constantly monitors a monitoring area, detects infrared energy radiated from a flame when a fire occurs, and generates a fire. Outputs signal and fire source location information. The fire detector 11 has a main body 16 having a conical turning portion 13 below the detector main body cover 12, and a slit-like detection window 14 is formed in the turning portion 13.

As shown in FIG. 2, the revolving unit 13 is rotated by a horizontal scanning motor 15 which is a pulse motor in a horizontal direction with respect to the main body 16 in steps of, for example, 0.72 degrees.
It can reciprocate in a range of 0 degrees. 17 is a rotating mirror,
The rotating mirror 17 is fixed to a shaft 18A of a vertical scanning motor 18 which is a DC motor, facing the detection window 14. The rotating mirror 17 has mirror surfaces on both the front and back sides.
8 rotates at a constant speed of 45 degrees to scan the vertical scanning range of 90 degrees from directly below to a distant horizontal plane.

The infrared light from the monitoring area is regulated by the detection window 14 within a range of 90 degrees in the vertical direction from directly below to the horizontal plane, is reflected by the rotating mirror 17, is imaged by the objective lens 19, and is imaged by the reflecting mirror 20. Reflected by the slit 2
1 determines the instantaneous field of view 22 and then the focusing lens 2
The light is condensed on the light receiving surface of the infrared sensor 24 by 3. Note that the instantaneous visual field 22 is a monitoring visual field when the rotating mirror 17 is assumed to be stopped.

By rotating the horizontal scanning motor 15 stepwise and reciprocally in this manner, the turning unit 13 is rotated in the horizontal direction, and the rotating mirror 17 is rotated by the vertical scanning motor 18 at a constant speed. When scanning is performed in the vertical direction up to 90 degrees and in the horizontal direction from 0 degrees to 190 degrees, if a flame 25 is generated by a fire as shown in the figure, infrared light emitted from the disaster 25 is detected by a detection window. 14
Then, the light is reflected by the rotating mirror 17 and condensed on the infrared sensor 24 via the objective lens 19, the reflecting mirror 20, the slit 21 and the condenser lens 23.

When a control unit (not shown) determines that a fire has occurred based on the detection signal from the infrared sensor 24, it outputs fire source position information obtained by calculating the scanning position together with the fire signal. Next, FIGS. 3 to 5 show how the fire detector 11 is attached to the wall, FIG. 3 is a plan view, FIG.
FIG. 5 is a side view. 3 to 5, reference numeral 41 denotes a wall to which the fire detector 11 is attached.
A letter-shaped mounting base 42 is fixed by bolts 43. As shown in FIG. 6, the mounting base 42 has a plurality of screw holes 44 into which bolts 43 are screwed, and a pair of arms 45 is inserted into the horizontal portion and the main body 16 of the fire detector 11 is inserted into the distal end of the arm 45. Thus, a circular flange 46 is formed. A circular hole 47 is formed in the circular flange 46, and the main body 16 is inserted into the hole 47. The main body 16 is mounted on the circular flange 46 so as to be rotatable in the horizontal direction, and a ring member 48 to be fixed is held. The ring member 48 and the circular flange 46 are screwed at three places with screws 49.
, And the horizontal adjustment of the three screws enables fine adjustment of the horizontal level of the fire detector 11.

On the upper surface of the main body 16, fine adjustment plates 50-1, 50-2, 50-3 and 50-4 are bolted at four places.
The fine adjustment plate 50 has a long hole 51 formed therein, and a horizontal fixing screw 52 for fixing the fine adjustment plate 50 to the ring member 48 is inserted into the long hole 51. Fine adjustment plate 50
A fine adjustment plate 50, that is, a hexagonal bolt 53 for moving the main body 16 fixed to the fine adjustment plate 50 in the circumferential direction is provided on the ring member 48 outside the side walls 61 on both sides of the support plate 54.
Is provided via The tip of the hexagon bolt 53 is in contact with the outer surface of the side wall 61 of the fine adjustment board 51. With the horizontal fixing screws 52 of the fine adjustment panels 50-1 to 50-4 loosened, the hex bolt 5
3, the main body 16 can be rotated in the circumferential direction with respect to the ring member 48 by pushing the fine adjustment plate 50. By screwing the horizontal fixing screw 52 at a predetermined horizontal position, the main body 16 is finely rotated. It is fixed to the ring member 48 via the adjustment plate 50. Thus, the main body 16 is attached to the mounting base 4.
2 can be fixed at a predetermined horizontal position. A power cable 55 and a signal cable 56 are drawn out from the main body 16. Also, the mounting base 4
A bubble tube 57 is mounted on 2, and a bubble tube 58 is also mounted on the ring member 48 and the main body 16. In addition, 59 is a connector for inspection.

Returning to FIG. 1, reference numeral 26 denotes a visible light laser emitting device. The visible light laser emitting device 26 measures the horizontal detection position of the fire detector 11 installed at a predetermined position in the monitoring area, and The visible light laser emitting device 26 is disposed at a predetermined position in the monitoring area to adjust the installation position of the detector 11, and emits the visible laser light 27 toward the detection window 14 of the fire detector 11.

When the visible laser light 27 from the visible light laser emitting device 26 enters the detection window 14, it is reflected by the rotating mirror 17. Since the rotating mirror 17 is rotated by the vertical scanning motor 18 and scans in a vertical direction 90 degrees from immediately below to the horizontal plane, the visible laser light 27 impinges on the rotating mirror 17 and becomes reflected light 28, and the reflected light 28 As described above, the monitoring area 6 is linearly directed from directly below to the visible light laser emitting device 26.
And can be seen as a bright line of reflected light.

Here, as the visible light laser emitting device 26, for example, a helium neon laser oscillator 26A as shown in FIG. 7 is used. Helium neon laser oscillator 2
6A is attached to an attachment portion 32 provided at a tip end of a support column 31 that is inserted and raised into a united portion 30 of three support legs 29. The helium-neon laser oscillator 26A has a support column 3
The height is adjusted by operating the lever 33 attached to the device 1. A power line 34 is drawn from the rear end of the helium neon laser oscillator 26A,
It is connected to a power supply unit 35 of AC100V. The helium neon laser oscillator 26A is connected to the window 14 of the fire detector 11.
Helium neon laser light 2 which is visible laser light
Fire 7

When the emitted helium-neon laser light 27 enters the window 14 of the fire detector 11, it is reflected by the rotating mirror 15 to become reflected light 28, and is linearly directed from directly below to the helium-neon laser oscillator 26A. The light is applied to the monitoring area 6 and forms a bright line that can be visually confirmed. next,
A method for adjusting the installation position of the fire detector 11 using the visible light laser emitting device 26 will be described.

First, the fire detector 11 is installed at a predetermined position in the monitoring area by using the mounting stand 42. At the time of installation, the screw 49 is rotated and adjusted so that the fire detector 11 is leveled by the bubble tubes 57 and 58 as levelers. In this case, the hexagon bolt 53 and the horizontal fixing screw 52 are loosened.
Next, the pseudo-fire source position 3 (θ1, α1) is determined. The pseudo-fire position 3 is determined from the result of reading the design drawing of the building and the result of the actual survey. When the pseudo excess point position 3 is determined by measuring from the reference position of the actual monitoring area of the building, the visible light laser emitting device 26 is installed at that position. Next, the fire detector 11 is activated to perform horizontal scanning by the horizontal angle θ1 from the horizontal scanning reference position (0-degree position) and stop.

That is, in the horizontal scanning, the turning unit 13 of the fire detector 11 is rotated by the horizontal scanning motor 15 by the same horizontal angle θ1 as the horizontal angle θ1 of the simulated fire source position and stopped. The mirror 17 is turned in the direction of the horizontal scanning angle θ1. The horizontal scanning drive of the fire detector 11 is performed by a horizontal angle θ with respect to a drive control unit (not shown) of the horizontal scanning motor 15.
1 may be inputted and driven, or the horizontal angle θ1 may be used.
May be calculated by calculating the number of horizontal scanning steps corresponding to.

Next, from the helium-neon laser oscillator 26A installed at a position in front of the detection window 14 rotated by the horizontal angle θ1 in this manner, helium-neon, which is visible laser light, is directed toward the detection window 14. Laser light 27
Fire. When the emitted helium neon laser light 27 does not enter the detection window 14, the reflected light 28 does not return because it is not reflected by the rotating mirror 17. In this case, the direction of the helium neon laser oscillator 26A is adjusted so that the emitted helium neon laser light 27 is incident on the detection window 14.

Helium neon laser light 27 is applied to detection window 14.
, The rotating mirror 17 is rotated by the vertical scanning motor 18 at a constant speed in the vertical direction of 90 degrees from directly below to the horizontal plane, so that the reflected light reflected by the rotating mirror is applied as shown in FIG. Reference numeral 28 illuminates the monitoring area 6 linearly from immediately below the fire detector 11 to 90 degrees in the vertical direction, and a bright line of the reflected light 28 is formed. When the bright line of the reflected light 28 overlaps the helium-neon laser light oscillator 26A, the reference position of the monitoring area in which the fire detector 11 is to be installed and the start position of the horizontal scanning of the fire detector 11 must match. You can check.

When the bright line of the returned reflected light 28 does not overlap the optical axis of the helium-neon laser light oscillator 26A as shown in FIG. 8, the reference position of the actual monitoring area and the horizontal scanning of the fire detector 11 are determined. It is immediately apparent that the start position is shifted by Δθ. If there is a shift, the fire detector 11 is shifted by an amount such that the bright line of the reflected light 28 reflected by the rotating mirror 17 overlaps the helium-neon laser oscillator 26A.
Rotate for fine adjustment.

That is, the hexagon bolt 53, which has been loosened so as to eliminate the deviation, is screwed in and the fine adjustment plate 50 is pushed. As a result, the main body 16 moves in the circumferential direction with respect to the ring member 48 together with the fine adjustment plate 50. When the bright line of the reflected light 28 overlaps the helium-neon laser oscillator 26A, four loosened horizontal fixing screws 52 are tightened,
The main body 16 is fixed to the mounting base 42 via the ring member 48.

With this adjustment, the horizontal angle θ1 from the position of the horizontal angle θ1 from the reference position of the monitoring area 6 where the fire detector 11 is to be installed and the horizontal angle θ from the horizontal scanning start position of the fire detector 11
The position scanned by one can be matched. Therefore, by adjusting the installation position of the fire detector 11, the reference position of the monitoring area 6 of the building and the start position of the horizontal scanning of the fire detector 11 can be matched, and as a result, the horizontal range of the monitoring area of the building can be reduced. The horizontal scanning range of the fire detector 11 can be matched.

In the embodiment of the present invention, the position of the horizontal angle θ1 from the reference position of the monitoring area of the building coincides with the position scanned by the horizontal angle θ1 from the horizontal scanning start position of the fire detector. However, it is difficult to perform the adjustment work because the reference position of the monitoring area is often the corner of the building, so the adjustment work should be performed at a place moved by the predetermined horizontal angle θ1. I have to. If the location of the reference position is a place where the adjustment operation is easy, the adjustment operation may be performed at the reference position.

In the embodiment of the present invention, helium-neon laser light is used as the visible laser light 27. However, the present invention is not limited to this, and any other device that emits visible light can be used. May be something. However, a laser that emits linear light is desirable. Further, before installing the visible light laser emitting device 26 at the position of the predetermined horizontal angle θ, the fire detector 11 may be scanned in advance only at the predetermined horizontal angle.

[0034]

As described above, according to the present invention, the visible light laser installed at a predetermined horizontal angle θ1 from the reference position of the monitoring area where the fire detector is to be installed in the monitoring area. The launching device emits visible laser light toward the fire detector that has been horizontally scanned by a predetermined horizontal angle θ1 from the horizontal scanning start position, and is reflected by the rotating mirror of the fire detector that irradiates the monitoring area. In order to adjust the installation position by rotating the fire detector body horizontally so that the bright line by the reflected light of the visible laser light and the optical axis of the visible light laser emitting device overlap, Without doing
The installation position of the fire detector main body can be adjusted simply and accurately by using the visible light laser emitting device so that the reference position of the monitoring area of the building and the start position of the horizontal scanning of the fire detector coincide with each other.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a method for adjusting the installation position of a scanning fire detector according to the present invention.

FIG. 2 is a configuration diagram of a fire detector.

FIG. 3 is a plan view showing a mounting state of the fire detector.

FIG. 4 is a front view showing a mounting state of the fire detector.

FIG. 5 is a side view showing an attached state of the fire detector.

FIG. 6 is a diagram showing a mounting base.

FIG. 7 is a diagram showing a helium neon laser oscillator.

FIG. 8 is an explanatory diagram of the displacement between the reflected light and the position of the fire detector.

FIG. 9 is an explanatory view of a conventional example.

FIG. 10 is an explanatory diagram of an adjustment method.

FIG. 11 is an explanatory diagram of another method of adjusting the installation position.

FIG. 12 is an explanatory diagram of an adjustment operation.

[Explanation of symbols]

 11: Fire detector (scanning fire detector) 12: Detector body cover 13: Revolving part 14: Detection window 15: Horizontal scanning motor 16: Main body 17: Rotating mirror 18: Vertical scanning motor 18A: Axis 19: Objective lens Reference Signs List 20: Reflecting mirror 21: Slit 22: Instantaneous field of view 23: Condensing lens 24: Infrared sensor 25: Fire 26: Visible light laser emitting device 26A: Helium neon laser oscillator 27: Visible laser light 28: Reflected light 29: Support leg 30 : Coupling part 31: Support pillar 32: Mounting part 33: Lever 34: Power line 35: Power supply unit 41: Mounting wall 42: Mounting base 43, 60: Bolt 44: Screw hole 45: Arm 46: Circular flange 47: Hole 48 : Ring member 49: Screw 50-1, 50-2, 50-3, 50-4: Fine adjustment plate 51: Slot 52: Horizontal fixing screw 53: Hexagon Belt 54: support plate 55: Power cable 56: signal cable 57, 58: bubble tube 59: inspection connector 61: accumbens

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 17/12 G01J 1/02 G08B 17/00

Claims (2)

(57) [Claims] 1. A fire is judged on the basis of a detection signal of radiant energy from a monitoring area obtained by scanning a monitoring area horizontally in each step and scanning a vertical direction in each horizontal direction by a rotating mirror. In the installation position adjustment method of the scanning fire detector, in the monitoring area, a visible light laser emitting device is installed at a position at a predetermined horizontal angle from a reference position of the monitoring area where the scanning fire detector is to be installed, The visible light laser emitting device irradiates visible laser light toward the scanning type fire detector in a state where the scanning is performed by the predetermined horizontal angle from the horizontal scanning start position, and the scanning type irradiating a monitoring area is performed. The scanning fire detector main body is positioned horizontally so that the emission line of the visible laser light reflected by the rotary mirror of the fire detector overlaps the optical axis of the visible laser emitting device. Installation position adjusting method of a scanning fire detector and adjusts the installation position and rotated to. 2. The method for adjusting the installation position of a scanning fire detector according to claim 1, wherein the cross section is L-shaped and a circular hole is formed when the scanning fire detector body is inserted into a tip of a horizontal portion. Is provided, and a mounting base for attaching a vertical portion to a wall is held at a predetermined interval on the flange, and the scanning fire detector main body is mounted so as to be rotatable in a horizontal direction and fixed. A ring member, and the scanning type fire detector is installed on the ring member, and a bright line by reflected light of visible laser light reflected by the rotating mirror of the scanning type fire detector applied to a monitoring area. The scanning fire detector is characterized in that the scanning fire detector main body is horizontally rotated on the ring member to adjust the installation position so that the optical axis of the visible light laser emitting device overlaps. Installation position adjustment method.