JP2009104493A - Photoelectric separated sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric separated sensor which is inexpensive and whose installation work can be efficiently performed. <P>SOLUTION: The photoelectric separated sensor includes a base to be fitted to a wall surface, a body which is fixed to the locking part of the base and on which an optical component for smoke detection is mounted, and a cover having an optical filter in the front. The sensor includes a coming-off preventing means which has a flexible coil shape part for fixing one end to the base and the other end to the body. The coming-off preventing means are also made removable. Moreover, the groove part of the cover is held between coiled wires of the coil shape parts of the coming-off preventing means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a photoelectric separation type sensor that involves a high-place installation work in applications such as a large space.

Conventionally, since the photoelectric separation type sensor has not been provided with a drop prevention means between the mounting plate and the main body, it is necessary to pay particular attention to preventing the main body from dropping during construction. In addition, some covers include a drop prevention means configured to be openable and closable in the vertical direction with respect to the main body by a cover fixing wire, a fixing metal fitting, and a cover fixing metal fitting. (See Patent Document 1)
Japanese Patent No. 318497

  In the conventional photoelectric separation type sensor, there was no drop prevention means between the mounting plate and the main body, so it is necessary to place the main body and the cover in the vicinity of the sensor installation place where a large amount of dust is flying. was there. Therefore, the mounting workability of the sensor is not good, and dust adheres to the optical system parts, affecting the set value at the time of sensitivity adjustment.

  On the other hand, even when a drop-off prevention means is provided between the main body and the cover, the cover fixing wire, the cover fixing metal fittings and the like are constituted by dedicated parts and are expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a photoelectric separation type sensor that is low in cost and can efficiently install the sensor.

  The photoelectric separation-type sensor of the present invention includes a base attached to a wall surface, a main body mounted with a fire detection optical system component fixed to a locking portion of the base, and a cover having an optical filter on the front surface. In the photoelectric separation type sensor provided, a drop-off preventing means having a stretchable coil-shaped portion for fixing one end to the base and the other end to the main body is provided.

  Further, the drop-off prevention means is detachable.

  The coil-shaped portion is characterized in that it temporarily holds the groove portion of the cover when the sensor is installed.

  The effect of the photoelectric separation type sensor of the present invention is that it is not necessary to place the main body and the cover in different places when the base plate is installed, so that the sensor can be mounted efficiently. In addition, the optical system parts can be isolated from dust or the like floating near the sensor installation location. Furthermore, since the drop-off prevention device can be a general-purpose product, cost can be reduced.

Embodiment 1
FIG. 1 is an external perspective view of a transmitter / receiver of a photoelectric separation type sensor according to the present invention. FIG. 2 is an external perspective view of the photoelectric separation type sensor according to the present invention, with the transmitter and receiver covers removed. FIG. 3 is a side sectional view of the light receiver of the photoelectric separation type sensor according to the present invention. 1 to 3, reference numeral 1 denotes a transmitter / receiver, which shows a receiver 1b. 2 is a base plate that is screwed into a box (not shown) installed on a wall surface, 3 is a main body on which optical system parts including a support frame 4, an optical stand 5, optical elements, and the like are mounted, and 20 is substantially in the upper front portion The front plate 21 having an arc-shaped optical filter and the operation unit cover 22 that opens and closes at the time of sensitivity adjustment are provided at the lower part of the front surface.

  Reference numeral 2 a denotes a suspended piece of the base plate 2 that serves as a mounting base on the back side of the main body 3. Reference numeral 3a denotes an instrument base of the main body 3, which houses the circuit board 8 therein. 3b is a mounting piece extending the main body 3 having a plurality of dharma holes, 30 is a mounting screw, and 31 is a device base 3a via a groove 20a in the lower part when the cover 20 is hooked on the upper part of the base plate 2. It is a mounting screw for fixing to the mounting protrusion 3c. 4 is a sheet metal support frame having a substantially U-shaped front cross section, and is fixed to the top surface of the table 3a so as to be rotatable about the position of the fixing screw 32. Reference numeral 11 denotes a drop-off preventing means having a coil-shaped portion having one end screwed to the back surface of the base plate 2 and the other end screwed to the side surface of the device base 3a of the main body 3. Note that the drop-off prevention means 11 uses a general-purpose product that can be repeatedly used, such as a curl cord or a coil spring, and is low in cost.

  Reference numeral 5 denotes an optical bench, which is formed in a bowl shape with, for example, dark resin. 5a is a rotating shaft on the left and right sides of the optical bench 5, 5b and 5c are aiming holes and peeping holes, 7 is an inclined mirror, and a right and left paired structure is constructed that can be adjusted from either the left or right side of the diagonal front. Yes. Reference numeral 6 denotes a lens fitted on the front surface, and reference numeral 60 denotes a light receiving element such as a photodiode provided on the inner axis. The optical bench 5 is supported by the support frame 4 so as to be rotatable in the vertical direction by fitting the rotation shaft 5a into the bearing holes 4a of the left and right support frames 4. L is the optical axis of the optical system including the optical bench 5.

  41 and 42 are two adjusting screws provided in parallel along the optical axis L, 43 and 44 are washers, and 45 and 46 are coil springs that apply an expansion force in the assembled state. Further, the two adjusting screws 41 and 42 of the first embodiment are provided so as to be shifted from the apparent center of rotation of the optical bench 5. One adjusting screw 41 is inserted through the insertion hole 3 d of the main body 3 through the washer 43 and the coil spring 45, and the tip is screwed into the screw hole 4 b of the support frame 4. The other adjustment screw 42 is passed through the insertion hole 5 d of the optical bench 5 through the washer 44 and the coil spring 46, and then the screw tip is screwed into the screw hole 4 c of the support frame 4.

  Reference numeral 12 denotes a panel of an operation unit provided at the lower part of the main body 3, and 8 denotes a circuit board. The circuit board 8 is mounted with a terminal block 9 or the like for connecting electrical components (not shown) and external wiring, and is protected by an insulating cover 10 attached thereto. In addition, the top surface of the insulating cover 10 is an inclined surface in order to guide wiring from the outside to the terminal block 9, thereby improving wiring connectivity. In addition, in accordance with the position of a display (not shown) printed on the panel 12, a fire confirmation lamp 50 and a trouble indicator lamp 51 using LEDs, a monitoring / adjustment mode changeover switch 52, a monitoring distance changeover switch 53 and a sensitivity setting volume 54. The battery terminal 55 is mounted in a state where it can be operated or confirmed.

  Although the light receiver 1b is illustrated in FIGS. 1 to 3 described above, a housing having the same shape is commonly used for the transmitter / receiver 1. The difference between the light transmitter 1a (not shown) and the light receiver 1b is that the light transmitting element disposed inside the optical bench 5, the light receiving element, the signal processing circuit, the circuit board 8 on which the LED and the like are mounted, etc. It is limited to the structural member accompanying the functional difference called light reception. A light transmitter 1a and a light receiver 1b having a common housing are separated and attached to both sides of a ceiling, a side wall, and the like in a building via a box or the like (not shown).

  The attachment method of Embodiment 1 of this invention is demonstrated. FIG. 4 is an external perspective view of the cover. FIG. 5 is an external perspective view in which the main body and the cover are suspended through the drop-off prevention means. First, the base plate 2 is installed in a box (not shown) provided near the ceiling of the opposite side wall in the building by screwing the hanging pieces 2a and the like. At this time, the main body 3 is suspended from the base plate 2 via the drop-off prevention means 11 in which the coil-shaped portion is elongated. Further, the groove 20 a of the cover 20 is sandwiched between adjacent windings of the coil-shaped portion of the drop-off preventing means 11. Next, the main body 3 connected to the tip of the drop-off prevention device 11 is picked up, and a terminal block 9 in which an unillustrated electric wire drawn out from the wall through the installed base plate 2 is mounted on the circuit board 8 is mounted. Connect to. When the wiring is completed, it is fixed by a plurality of mounting screws 30 in the dharma hole of the mounting piece 3b protruding in a J-shape on the back side of the table 3. At this time, the drop-off prevention means 11 sandwiches the lightweight part only of the cover 20, and the elongation of the coil-shaped portion is reduced. The drop-off prevention means 11 needs to have sufficient strength so that it can be safely operated even when the cover 20 and the main body 20 are suspended in the air.

  The optical axis L is adjusted in the following procedure. First, in a state where the cover 20 of the light receiver 1b attached to the side wall is removed, the light transmitter 1a on the opposite side wall surface is viewed through the sighting hole 5b and the mirror 7 from the oblique direction of the front surface of the main body 3. See through. While seeing through, the right adjustment screw 41 is turned to rotate the support frame 4. Then, the horizontal center of the projected image of the light transmitter 1a on the mirror 7 is made to coincide with the horizontal center of the aiming hole 5b. By this operation, the horizontal (left and right) direction of the optical axis L using the sighting device is adjusted. Next, following the horizontal adjustment of the optical axis L, the vertical optical axis adjustment is also performed. The left adjustment screw 42 is used for adjusting the optical axis in the vertical direction. When the adjustment screw 42 having the tip screw portion screwed into the screw hole 45 is rotated forward and backward, the optical bench 5 is rotated up and down in the vertical plane around the left and right rotation shafts 5a. When the center of the projected image of the front light transmitter 1a projected onto the mirror 7 through the aiming hole 5b is confirmed at the center position of the aiming hole 5b, the optical axes of the light transmitter 1a and the light receiver 1b L matches and the optical axis adjustment of the optical system is completed.

  In general, a light transmitting element used in this type of sensor has directivity. When the peak value of the received light output deviates from the optical axis L based on the directivity of the light transmitting element, it is necessary to adjust the optical axis to compensate for the deviation. For this reason, after the apparent optical axis adjustment of the optical system using the sighting device is completed, final adjustment for compensating directivity is performed using a level meter (DVM) (not shown). For optical axis adjustment to compensate for directivity, a level meter for measuring the light reception output of the light receiving element 60 is connected to the light receiver 1b side. The light receiving output corresponding to the rotational position of the adjusting screws 41 and 42 on the light transmitter 1a side is measured by the level meter connected to the light receiver 1b.

  When the cover 20 held by the drop-off prevention means 11 is removed after these adjustments are completed, the coil-shaped portion of the drop-off prevention means 11 returns to the normal state as shown in FIG. Then, the cover 20 is hooked on the upper portion of the base plate 2 and attached to the lower portion of the base plate 2 by fixing with the mounting screw 31 to the mounting protrusion 3c of the main body 3 via the groove portion 20a. In addition, considering a series of workability, it can be said that a curled cord having flexibility is easy to handle.

  Therefore, it is not necessary to place the main body 3 and the cover 20 in different places when the base plate 2 is installed, so that the sensor can be attached efficiently. Further, the optical system component mounted on the main body 3 and the optical filter provided on the cover 20 can be isolated from dust or the like floating near the sensor installation location.

The drop-off prevention means 11 is screwed to the base plate 2 and the main body 3, but may be detachable. In this case, a plurality of transmitters and receivers 1 can be installed by one drop-off preventing means 11, and the components can be used effectively.

FIG. 3 is an external perspective view of a transmitter / receiver of a photoelectric separation type sensor according to the present invention. It is the external appearance perspective view which removed the transmission of the photoelectric separation type sensor in this invention, and the cover of the light receiver. It is a sectional side view of the light receiver of the photoelectric separation type sensor in the present invention. It is an external appearance perspective view of a cover. It is an external appearance perspective view which has suspended the main body and the cover through the drop prevention means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feed, light receiver, 1a Light transmitter, 1b Light receiver, 2 Base board, 2a Hanging piece, 3 Main body, 3a Instrument stand, 3b Mounting piece, 3c Mounting protrusion, 3d Insertion hole, 4 Support frame, 4a Bearing Hole, 4b, 4c Screw hole, 5 Optical stand, 5a Rotating shaft, 5b Aiming hole, 5c Viewing hole, 5d Insertion hole, 6 Lens, 7 Mirror, 8 Circuit board, 9 Terminal block, 10 Insulating cover, 11 Drop prevention means , 12 Panel, 20 cover, 20a Groove, 21 Front plate, 22 Operation part cover, 30, 31 Mounting screw, 32 Fixing screw, 41, 42 Adjustment screw, 43, 44 Washer, 45, 46 Coil spring, 50 Fire confirmation light, 51 trouble indicator lamp, 52 monitoring / adjustment mode selector switch, 53 monitoring distance selector switch, 54 sensitivity setting volume, 55 battery connector, 56 jack terminal, 60 light receiving element, L light

Claims (3)

In a photoelectric separation type sensor comprising: a base attached to a wall surface; a main body that is fixed to a locking portion of the base and on which an optical system component for fire detection is mounted; and a cover having an optical filter on the front surface.
A photoelectric separation-type sensor comprising a drop-off preventing means having a stretchable coil-shaped portion that fixes one end to the base and the other end to the main body.     The photoelectric separation type sensor according to claim 1, wherein the drop-off prevention means is detachable. The photoelectric separation type sensor according to claim 1, wherein the coil-shaped portion sandwiches a groove portion of the cover.

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