JP2006268868A - Photoelectric separation sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric separation sensor that is assembled easily and of which camera cone is pivoted so as to allow smooth optical axis regulating work. <P>SOLUTION: The photoelectric separation sensor 100 comprises the camera cone 22, a frame 24 for supporting the camera cone, and an optical axis regulating means 50 that rotates the camera cone about first and second straight lines and is formed of first and second regulating means. The first and second regulating means comprise regulating screws 51 and 52 formed of an operation knob 55 and a shaft section 56, a spring 60 engaged with the shaft section, a washer 61 engaged with the shaft section at the spring tip, and a nut 62 for screwing with a screw of the shaft section at the tip of the washer. Opening members that can insert the shaft section into the camera cone and frame and cannot insert the washer into them are disposed, and the washer and the nut of each regulating means are attached to respective opening members of the camera cone and frame so as to grip it with a spring energizing force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a photoelectric separation type sensor that is installed separately from a light emitter and a light receiver and detects smoke by detecting smoke generated by a fire.

There is a known photoelectric separation type sensor that installs a light emitter and a light receiver separately, detects the presence or absence of smoke by receiving light emitted from the light emitter, and detects the occurrence of fire. Yes.
In such a photoelectric separation type sensor, the light emitter and the light receiver are provided with a lens barrel holding a lens and an optical axis adjusting mechanism for adjusting the optical axis of the lens barrel. As an optical axis adjustment mechanism generally used in a conventional photoelectric separation type sensor, a screw hole is provided in a lens barrel or a member supporting the lens barrel, and an adjustment screw is screwed into the screw hole. It was adjusted by rotating the adjusting screw.

An example of such an adjustment mechanism is disclosed in Patent Document 1. FIG. 15 shows an outline of the sensor disclosed in this publication. In the photoelectric separation type sensor 1 disclosed in this publication, a lens barrel 3 in which a lens 2 is fitted is pivotally supported with respect to a U-shaped frame 4 so as to be vertically rotatable. Is pivotally supported to the left and right with respect to the turntable 5. Then, the lens barrel 3 and the frame 4 and the frame 4 and the turntable 5 are connected by adjusting screws 8 and 8 so as to be separated from each other by the biasing force of the spring 7. In the sensor 1 configured as described above, the operation of adjusting the lens barrel 3 in the vertical and horizontal directions is performed by rotating each adjustment screw 8 to narrow the space between the springs 7 against the urging force of the spring 7. , By using the urging force of the spring 7 to widen the space between each other.
Japanese Unexamined Patent Publication No. Hei 4-191998

However, the optical axis adjusting mechanism has a structure in which the adjusting screw 8 is directly screwed into the screw hole formed in the frame 4. Therefore, when the adjusting screw 8 is rotated for adjusting the optical axis, the adjusting screw 8 is rotated. As a result, the angle of the screw hole with respect to the axial direction changes, and the rotational torque of the adjusting screw 8 increases, making it impossible to make a smooth adjustment, and there is a risk of causing distortion in each member.
In order to assemble this optical axis adjustment mechanism, the adjustment screw 8 is adjusted to the screw hole of the frame 4 while accurately adjusting the axial direction of the adjustment screw 8 in the length direction of the screw hole with the spring 7 interposed. Must be screwed. It was not easy to perform this assembling work while resisting the biasing force of the spring 7.

Further, since the amount of rotation of the lens barrel with respect to the amount of rotation of the adjusting screw is set to be very small, the rotation of the lens barrel is difficult to understand with the naked eye. Nevertheless, the adjustment screw provided in the optical axis adjustment mechanism of the conventional photoelectric separation type sensor does not clearly indicate the relationship between the rotation direction and the rotation direction of the lens barrel. In order to rotate the lens barrel in the direction, in which direction the adjustment screw should be rotated, if there are multiple adjustment screws, it is difficult to determine which adjustment screw should be operated, and it takes time for adjustment There were many things.
In particular, the photoelectric separation type detector is often installed in a dark place with a high ceiling such as a large sports facility, and the adjustment work is still difficult.

  The present invention has been made in view of the above circumstances, and is provided with an optical axis adjustment mechanism that can be easily and easily adjusted without applying excessive force that distorts each member. It is an object of the present invention to provide a photoelectric separation type sensor having a mounting structure that is pivotally supported so that an optical axis adjustment operation can be performed.

The invention described in claim 1 is, for example, as shown in FIGS.
A light emitter having a light emitting means for emitting light and a light receiver having a light receiving means for receiving light emitted from the light emitter are arranged separately, and detects the presence or absence of smoke therebetween,
The emitter and receiver are respectively
A holding member (lens barrel 22) that holds the light emitting means and the light receiving means and is rotatable about a first straight line orthogonal to the optical axes of the light emitting means and the light receiving means;
A support member (frame 24) that supports the holding member and is rotatable around a second straight line orthogonal to the optical axis and the first straight line;
In order to adjust the optical axes of the light emitting means and the light receiving means, a first adjusting means for rotationally driving the holding member about the first straight line, and a first adjusting means for rotationally driving the support member about the second straight line. In a photoelectric separation type sensor (smoke sensor 100) comprising an optical axis adjustment means (50) comprising two adjustment means,
Each of the first adjustment means and the second adjustment means includes an operation knob (55) and a knob member (adjustment screws 51 and 52) including a shaft portion (56) in which a screw (screw portion 56a) is cut, A spring (adjustment springs 60, 60) fitted to the shaft, a washer (61, 61) fitted to the shaft at the tip of the spring, and a screw on the shaft at the tip of the washer Mating nuts (round nuts 62, 62),
The holding member is provided with a first aperture member (vertical adjustment portion 54) having an aperture (54a) through which at least the shaft portion can be inserted and the washer cannot be inserted,
The first adjusting means is attached so that the washer and the nut sandwich the first opening member by the biasing force of the spring,
The support member is provided with a second aperture member (left and right adjustment portion 53) having an aperture (53a) through which at least the shaft portion can be inserted and the washer cannot be inserted,
The second adjusting means is characterized in that the washer and the nut are attached so as to sandwich the second opening member by the biasing force of the spring.

According to the first aspect of the present invention, in the first and second adjusting means constituting the optical axis adjusting means, the first opening member of the holding member by the washer and the nut by the biasing force of the spring, and the support member Since the second opening member is sandwiched, the amount of screwing to the shaft portion of the nut is changed by rotating the operation knob, that is, when the position of the nut is changed, the holding member is moved by the nut and the washer. Since the support member is pulled or pushed through the first aperture member and the second aperture member, it eventually rotates as the nut moves.
According to such a configuration, the relationship between the rotation amount of the holding member and the support member with respect to the rotation amount of the operation knob is substantially constant, and the optical axis of the light emitting unit and the light receiving unit held on the holding member smoothly and with high accuracy. Adjustments can be made.

The invention according to claim 2 is the photoelectric separation type sensor according to claim 1,
Each of the first opening member and the second opening member is provided with a nut storage portion (57, 58) for storing the nut in contact with the nut,
The nut has a curved surface having an arc-shaped cross section, and is screwed into the shaft portion so that the shaft portion penetrates the curved surface, and the nut is stored in the curved surface as the holding member and the support member rotate. The nut is accommodated in the nut accommodating portion so that the contact position with respect to the portion changes.

According to the second aspect of the present invention, the angles of the first opening member and the second opening member with respect to the nut housing portions with respect to the shaft portion of the knob member due to the rotation of the holding member and the support member in the adjustment operation. Even if the holding member and the supporting member rotate, the contact position of the curved surface of the nut with respect to the nut housing portion only changes, and an unreasonable force is applied to the holding member, the supporting member, or the knob member. Each member is not distorted.
Moreover, since it is a curved surface, the contact area is constant, and the force applied from the nut to the first and second aperture members does not change so much. In this respect, the optical axis can be adjusted in a constant state. it can.

  In the photoelectric separation type sensor according to claim 2, examples of the shape of the nut include a sphere and a semicircular cylinder with a semicircular cross section. It may be a round nut.

The invention according to claim 4 is the photoelectric separation type sensor according to claim 2 or 3, wherein
The opening formed in the first opening member and the second opening member is formed in a shape into which a nut can be inserted from the operation knob side,
The nut storage portion is continuous with the opening, and can store the nut inserted through the opening in a direction rotated by a predetermined angle in a plane orthogonal to the insertion direction.

  According to the fourth aspect of the present invention, the nut that is screwed into the operation knob can be inserted into the opening and rotated by a predetermined angle, and then stored in the nut storage portion. After passing through the hole member, there is no need for troublesome work such as screwing the nut from the opposite side of the operation knob, and if the knob member with the washer and nut fitted is rotated, it can be stored in the nut storage section. Is possible and can be assembled very easily.

The invention according to claim 5 is the photoelectric separation type sensor according to any one of claims 1 to 4, for example, as shown in FIG.
The light emitter and the light receiver respectively have knob members (adjustment screws 51 and 52) for driving the holding member in a predetermined direction to adjust the optical axes of the light emitting means and the light receiving means by operating the operation knob (55). Prepared,
Whether it is a light emitter or a light receiver,
The operation knob includes a display section (55c) that displays a method for adjusting the operation knob and a correspondence relationship between the operation direction of the operation knob when the operation knob is operated by this adjustment method and the direction in which the holding member is driven. It is provided.

According to the fifth aspect of the present invention, the adjustment method of the operation knob and the correspondence between the operation direction of the operation knob and the direction in which the holding member is driven when the operation knob is operated by this adjustment method are displayed. Since the display portion is provided, it can be readily seen from the display portion which method should be adjusted and in what direction the holding member is driven.
Here, examples of the method of adjusting the operation knob include a method of rotating the operation knob and a method of moving the operation knob linearly in the front-rear and left-right directions. The correspondence relationship between the operation direction of the operation knob when the operation knob is operated and the direction in which the holding member is driven is, for example, when the adjustment method is rotation, and when the operation knob is rotated to the right, the optical axis of the holding member When the operation knob is moved to the left when the operator moves or rotates to the right or the adjustment method is linear, the optical axis of the holding member moves or rotates to the left with respect to the operator. It is to do.
This display unit may be provided directly on the operation knob or printed with special ink, or may be provided with a nameplate or a sticker.

In the photoelectric separation type sensor according to claim 5, as in the invention according to claim 6, the display unit may include a light emitting material.
According to invention of Claim 6, since the display part contains the luminescent material, even when installing in dark places, such as a high ceiling of a large sized facility, it is easy to visually check.
Here, examples of the light emitting material include a fluorescent material and a luminous material made of an inorganic material other than the fluorescent material, and “including” may be a state in which the light emitting material is applied, or a nameplate or a seal made of the light emitting material. May be.

The invention according to claim 7 is the photoelectric separation type sensor according to any one of claims 5 and 6,
The display part is characterized in that it is formed on a concave surface (55b) that is depressed more than the peripheral edge part (55a).

According to the seventh aspect of the present invention, since the display portion is formed in a concave surface that is lower than the peripheral edge portion, even if the operation knob is touched during adjustment work, the display portion is not touched so much. The characters on the display portion are not worn out and the nameplate and the seal are not easily peeled off, and can be used for a long time.
Moreover, when a display part is formed with a nameplate or a seal | sticker, at the time of manufacture, it is easy to position at the time of sticking because there is a level | step difference between a peripheral part and a concave surface.

The invention according to claim 8 is the photoelectric separation type sensor according to any one of claims 5 to 7,
The operation direction of the operation knob displayed on the display unit is the same as the direction in which the holding member is driven.

According to the eighth aspect of the invention, in addition to the effects of the fifth to seventh aspects of the invention, the operator can perform the adjustment work sensuously without feeling uncomfortable.
For example, if the operation knob is operated by a method of rotating or linearly moving in the front / rear / right / left direction, rotating the operation knob to the right causes the optical axis of the holding member to rotate to the right with respect to the operator. Or, when the adjustment method is linear movement, the optical axis of the holding member moves to the left with respect to the operator when the operation knob is moved to the left.

Moreover, in each structure as a means for solving a problem, for example, as shown in FIGS. 3, 7, and 9,
In order to adjust the optical axes of the light emitting means and the light receiving means, it can be driven to rotate about the first straight line orthogonal to the optical axis and the second straight line orthogonal to the optical axis and the first straight line. Provided with a supporting means for supporting the holding member,
The support means includes a frame body (frame 24) provided so as to surround the holding member, and a frame body support member (arm 25) that supports the frame body,
The holding member is provided with a first projecting member (protruding button 40) having a substantially cylindrical shape that can project and retract in a direction along the first straight line at two opposing positions on the first straight line. The body is provided with holding member engagement holes (engagement holes 38a, 38b) that are engaged with the first in / out member inscribed,
The frame body is provided with second projecting members (projecting buttons 40) having a substantially cylindrical shape that can project and project in a direction along the second straight line at two opposing positions on the second straight line. The body support member is provided with frame body engagement holes (engagement holes 26a, 26b) to be engaged with the second intruding member inscribed.
The first in / out member is engaged with the holding member engaging hole in a state where the frame is pressed,
You may add the structure which engages with the engagement hole for frames in the state which pressed the frame support member in the 2nd intrusion member.

According to such a configuration, the holding member is attached to the frame body in a state where the first protruding and retracting member capable of protruding and retracting in the direction along the first straight line is inscribed and engaged with the engaging hole for the holding member, The frame body is attached to the frame support member in a state in which the second protrusion / retraction member that can protrude and retract in the direction along the second straight line is inscribed and engaged in the frame engagement hole. The holding member is rotatable about the first straight line with the first retracting member as an axis, and the frame is rotatable with the second retracting member as the axis, so that the holding member is second through the frame. It can be rotated around a straight line. Therefore, the holding member is configured to be rotatable by using a movable protruding and retracting member, which is completely different from a conventional structure that is pivotally supported by a fixed pin or the like.
Since each protruding and retracting member has a substantially cylindrical shape, it rotates about a thick cylindrical axis as compared with fixing to a pin or the like, thereby enabling smooth rotation.
In addition, each projecting member is engaged with the frame body and the frame body supporting member in a pressed state. Therefore, even when a shift or the like is likely to occur in the relationship between the holding member and the frame body or the relationship between the frame body and the frame body support member during rotation, the pressing force of the first and second retracting members The members are not easily displaced, and rattling hardly occurs.
Further, unlike the conventional photoelectric separation type sensor, the holding member is directly supported on the first straight line, and is supported on the second straight line via the frame body. Since these are pivotally supported at four locations on the two straight lines, a strong pivotal support structure with no backlash in this respect is obtained.
As described above, since it can rotate smoothly without rattling, the optical axis adjustment operation can be performed with high accuracy.

Furthermore, in the above configuration,
The first in / out member is composed of an upper part that can be engaged with the holding hole for the holding member and a lower part that is thicker than the upper part, and presses the frame body by the lower part,
The second projecting member may include an upper portion that can be engaged with the engagement hole for the frame body and a lower portion that is thicker than the upper portion, and may be configured to press the frame body support member with the lower portion.
According to the above configuration, each projecting member is configured with an upper portion that can be engaged with the engagement hole for the frame body and a lower portion that is thicker than the upper portion, so that the engagement with each engagement hole and the frame body and the frame body support are performed. Two functions of pressing the member can be provided.

    Further, in the above configuration, the frame body may be provided with a guide groove (39) that is recessed so as to guide the first intruding member toward the engaging hole for the holding member. In this case, the holding member can be more easily assembled to the frame.

Furthermore, in the above configuration,
The first in / out member and the second in / out member can be in / out by coil springs (41, 41), respectively.
The holding member is provided with first storage holes (storage holes 33a, 34a) having openings toward the outside and storing the coil springs at the two opposing positions on the first straight line.
The frame body is provided with second storage holes (storage holes 35a, 36a) having openings toward the outside and storing the coil springs at the two opposing positions on the second straight line.
The first in / out member is fitted into the first storage hole so as to cover the coil spring inserted into the first storage hole,
The second retracting member may be configured to be fitted into the second storage hole so as to cover the coil spring inserted into the second storage hole.

In that case, it is only necessary to insert a coil spring into the first storage hole or the second storage hole and cover each protruding member from the first storage hole or the second storage hole.
Furthermore, when assembling the holding member to the frame body and the frame body to the frame support member, respectively, press the apex of the projecting member so that it is slightly depressed, align the position with the engagement hole, and then apply external force. Since it is naturally engaged by the biasing force of the coil spring, it can be assembled easily.

Furthermore, in the above configuration,
A spring support protrusion (protrusions 33b, 34b, 35b, 36b) for supporting the coil spring may be provided at the bottom of the first storage hole and the second storage hole.

In that case, the coil spring can be placed upright in each hole by inserting the coil spring into the first storage hole or the second storage hole so as to match the protrusion for supporting the spring. become.
Here, the shape of the spring supporting projection may be a projection having a width smaller than the diameter of the coil spring, or the coil portion at the end of the coil spring is supported so as to be sandwiched from the outside and the inside along the circumferential direction. It may be a thing.

Furthermore, in the above configuration,
The depths of the first storage hole and the second storage hole are substantially the same as the length of the coil spring, and a recess (40c) is provided in the lower part of each of the first and second retracting members to fit the head of the coil spring. It is good also as composition which has.

In that case, even if the length of the coil spring is secured to such an extent that a sufficiently stable urging force can be obtained, the length from the first storage hole or the second storage hole to the protruding and retracting member is compact. .
Further, when a coil spring is inserted into each of the first storage hole and the second storage hole and the concave portions of the lower portions of the first and second retracting members are put on the springs, the lower portions also enter the respective storing holes. . If each projecting member is completely protruding from each storage hole, it is difficult to work when attaching the holding member to the frame during assembly or attaching the frame to the frame support member. If this is done, it is not necessary to forcibly restrain the protruding and retracting members against the force of the coil spring, and assembly work is easy.

According to the first aspect of the present invention, in the first and second adjusting means constituting the optical axis adjusting means, the first opening member of the holding member by the washer and the nut by the biasing force of the spring, and the support member Since the second opening member is sandwiched, the amount of screwing to the shaft portion of the nut is changed by rotating the operation knob, that is, when the position of the nut is changed, the holding member is moved by the nut and the washer. Since the support member is pulled or pushed through the first aperture member and the second aperture member, it eventually rotates as the nut moves.
According to such a configuration, the relationship between the rotation amount of the holding member and the support member with respect to the rotation amount of the operation knob is substantially constant, and the optical axis of the light emitting unit and the light receiving unit held on the holding member smoothly and with high accuracy. Adjustments can be made.

According to the second aspect of the present invention, the angles of the first opening member and the second opening member with respect to the nut housing portions with respect to the shaft portion of the knob member due to the rotation of the holding member and the support member in the adjustment operation. Even if the holding member and the supporting member rotate, the contact position of the curved surface of the nut with respect to the nut housing portion only changes, and an unreasonable force is applied to the holding member, the supporting member, or the knob member. Each member is not distorted.
Moreover, since it is a curved surface, the contact area is constant, and the force applied from the nut to the first and second aperture members does not change so much. In this respect, the optical axis can be adjusted in a constant state. it can.

  According to the fourth aspect of the present invention, the nut that is screwed into the operation knob can be inserted into the opening and rotated by a predetermined angle, and then stored in the nut storage portion. After passing through the hole member, there is no need for troublesome work such as screwing the nut from the opposite side of the operation knob, and if the knob member with the washer and nut fitted is rotated, it can be stored in the nut storage section. Is possible and can be assembled very easily.

  According to the fifth aspect of the present invention, the adjustment method of the operation knob and the correspondence between the operation direction of the operation knob and the direction in which the holding member is driven when the operation knob is operated by this adjustment method are displayed. Since the display portion is provided, it can be readily seen from the display portion which method should be adjusted and in what direction the holding member is driven.

  According to invention of Claim 6, since the display part contains the luminescent material, even when installing in dark places, such as a high ceiling of a large sized facility, it is easy to visually check.

  According to the seventh aspect of the present invention, since the display portion is formed in a concave surface that is lower than the peripheral edge portion, even if the operation knob is touched during adjustment work, the display portion is not touched so much. The characters on the display portion are not worn out and the nameplate and the seal are not easily peeled off, and can be used for a long time.

  According to the eighth aspect of the invention, in addition to the effects of the fifth to seventh aspects of the invention, the operator can perform the adjustment work sensuously without feeling uncomfortable.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the appearance of a smoke detector 100 as an example of a photoelectric separation type sensor according to the present invention. The photoelectric separation type sensor includes a light emitter that emits light and a light receiver that receives light emitted from the light emitter. However, the configuration according to the present invention is almost the same regardless of whether the light emitter or the light receiver is used. Since this is the same, in the present embodiment, the following description will be given assuming that the smoke detector 100 may be either a light emitter or a light receiver.

  As shown in FIG. 1B, the smoke detector 100 includes a front cover 10 and a main body case 11 in appearance. A link 14 is provided at the upper end of the front cover 10 as shown in FIG. 2, while a shaft (not shown) is provided at the upper end of the main body case 11. The main body case 11 is rotatably attached to the main body case 11 by engaging with the main body case 11. Further, the front cover 10 and the main body case 11 are fixed as shown in FIG. 1B by the locking portion 15 provided at the lower end of the front cover 10 being locked to a claw (not shown) of the main body case 11. Has been. Then, the front cover 10 protects the inside of the main body case 11 in the state of FIG. 1B and rotates as shown in FIG. 2 to expose the inside of the main body case 11.

As shown in FIG. 1A, the front cover 10 is provided with a window 12, and light is emitted or received through the window 12. Further, an operation indicator lamp 13 is provided below the window 12 of the front cover 10 so that the smoke detector 100 lights up or blinks when a fire is detected.
A main body 20 having a light emitting function or a light receiving function is attached inside the main body case 11.

FIG. 3 is a cross-sectional view of the main body 20. The main body 20 includes a circuit housing portion 21, a lens barrel 22 to which a lens 23 is attached, a frame 24 that supports the lens barrel 22 from the side, an arm 25 that is attached to the circuit housing portion 21 and supports the frame 24 from above and below, and a light. The shaft adjusting means 50 and the like are included.
The circuit storage portion 21 is a box that is provided in the lower portion of the main body 20 and is formed in a substantially square shape when viewed from above in FIG. The circuit storage unit 21 is provided with a circuit board and connection terminals (not shown) connected to an optical unit 28 to be described later. The circuit storage unit 21 controls light emission from the optical unit 28 or the optical unit 28 A fire signal is output based on a light reception signal generated when light is received.

As shown in FIG. 3, the arm 25, which is a frame support member of the present invention, is formed in a substantially U shape in cross section, and includes an upper portion 25a, a back portion 25b, and a lower portion 25c. The lower portion 25c is formed in a flat plate having the same size and shape as the square shape of the circuit housing portion 21 when viewed from the vertical direction, and the back portion 25b and the upper portion 25a are formed in a long and narrow bar shape. As shown in FIG. 9 or FIG. 11, from the end of the lower portion 25c, a shaft portion holding portion 25d in which a shaft portion hole 25e into which a shaft portion 56 of an adjusting screw 51 described later is fitted is formed upward. It is extended.
Also, each of the upper portion 25a and the lower portion 25c of the arm 25 has the same shape of engagement holes (frame body engagement holes) 26a, 26b for engaging the projecting pins 40, 40 fitted in the frame 24. It is formed in size. The engagement holes 26 a and 26 b are provided so that a straight line (second straight line) connecting the centers is orthogonal to the optical axis of the lens 23.
A screw hole (not shown) for attaching the arm 25 to the main body case 11 is formed in the back portion 25b. Further, the upper surface of the circuit housing portion 21 is fixed to the lower portion 25c of the arm 25 by screws or the like.

As shown in FIGS. 3 and 4, the lens barrel 22 is formed in a substantially cylindrical shape and holds the lens 23 therein, and is a holding member of the present invention. A light transmission / reception circuit board 27 connected to the circuit board of the circuit housing part 21 via a lead wire 29 is attached to the opening at the rear part of the lens barrel 22. An optical unit 28 including a light receiving element is provided.
In the smoke detector 100, if the smoke detector 100 is a light emitter, the light emitted from the light emitting element is emitted forward through the lens 23, and if it is a light receiver, the light is emitted from the light emitter and passes through the lens 23. The light incident after passing through is received by the light receiving element.

  In addition, at the upper part of the lens barrel 22, there are observation holes 30 and 30, mirror insertion holes 31 and 31, and lighting holes 32 and 32 for confirming the optical axis when the optical axis is adjusted by the optical axis adjusting means 50. A pair of left and right is provided, and the mirrors 31 a and 31 a are inserted into the insertion holes 31 and 31 for the mirror, respectively. When light enters from the front of the smoke detector 100 through, for example, the left lighting hole 32 due to the angle relationship between the lighting holes 32 and 32, the mirrors 30a and 30a, and the peeping holes 30 and 30, the mirror 31a at the rear thereof. And is emitted from the right peephole 30. The operator who performs the optical axis adjustment operation adjusts the optical axis so that the target light enters the eyes through the right viewing hole 30.

  As shown in FIGS. 4 and 6, on both sides of the lens barrel 22, lens barrel fixing portions 33 and 34 projecting annularly toward the outside are provided in order to fix the lens barrel 22 to the frame 24. Yes. Further, the lens barrel 22 is provided with a vertical adjustment portion 54 for attaching a round nut 62 passed through an adjustment screw 52 described later. The lens barrel fixing portions 33 and 34 and the vertical adjustment portion 54 will be separately described later.

The frame (frame body) 24 is formed in a rectangular shape when viewed from the front as shown in FIG. 7, and the lower left end protrudes forward as shown in FIG. A shaft portion holding portion 24a in which a shaft portion hole 24b through which 52 is passed is formed.
As shown in FIGS. 5 and 7, a frame fixing portion 35 is provided at the upper end portion of the frame 24, and a frame fixing portion 36 is provided at the lower end portion. The frame fixing portions 35 and 36 are provided at positions corresponding to the engagement holes 26a and 26b.

Furthermore, engagement holes (holding member engagement holes) 38a and 38b for fixing the lens barrel 22 are formed in the center of both sides of the frame 24 with the same shape and size. As shown in FIG. 7, the engagement holes 38 a and 38 b are formed such that the inner diameter is larger than the outer diameter, and a step 24 c is formed therebetween, and the outer diameter is the engagement holes 26 a and 26 b of the arm 25. Is approximately the same diameter.
In addition, as shown in FIG. 5, there is a shallow groove formed on the inner side of the frame 24 so as to guide from the rear toward the engagement holes 38a and 38b, which serves as a guide when the lens barrel 22 is fixed to the frame 24. A certain guide groove 39 (only one is shown) is formed. The engagement holes 38a and 38b are provided so that a straight line (first straight line) connecting the centers thereof is orthogonal to the optical axis of the lens 23 and the second straight line.
Further, a right and left adjustment portion 53 for attaching a round nut 62 passed through an adjustment screw 51 described later is provided inside the lower right portion of the frame 24.

Next, an attachment structure between the lens barrel 22, the frame 24, and the arm 25 will be described with reference to FIGS.
As described above, the lens barrel 22 is provided with the lens barrel fixing portions 33 and 34 projecting annularly on both outer sides. FIG. 6 shows the structure of the lens barrel fixing portion 33. As shown in FIG. 6, the lens barrel fixing portion 33 is formed in a cylindrical shape, and is provided with a storage hole (first storage hole) 33a for storing the coil spring 41 therein. The storage hole 33a is formed to a certain depth so that the length of the coil spring 41 is obtained so that a stable urging force can be obtained, and the coil spring 41 is substantially received. Here, the length of the coil spring 41 that can obtain a stable biasing force is, for example, when the lens 23 has a diameter of about 3 to 4 cm, and the coil spring 41 has a diameter of about 0.5 cm and a length of about 1 cm. . An annular small protrusion (spring supporting protrusion) 33b having a diameter smaller than the diameter of the coil spring 41 is formed at the bottom of the storage hole 33a.

  On the other hand, the projecting button 40 having a circular shape in plan view is a first projecting member composed of an upper part 40a and a lower part 40b. The lower part 40b has a larger diameter than the upper part 40a, and a step 40e is formed therebetween. The diameter of the upper part 40a is formed so as to engage with the outer part of the engagement hole 38a so as not to shake. The outer diameter of the lower portion 40b can be fitted into the storage hole 33a and is formed to fit inside the engagement hole 38a. Further, the lower portion 40b has a recess 40c. The upper portion 40a is formed with a chamfered portion 40d that is chamfered in an annular shape so as to be easily engaged with the engagement hole 38a.

  Similarly to the lens barrel fixing portion 33, the lens barrel fixing portion 34 is also formed with a storage hole (first storage hole) 34a and a protrusion (spring supporting protrusion) 34b. 40) The coil spring 41 is fitted.

When the lens barrel 22 is fixed to the frame 24, first, the coil spring 41 is inserted into the accommodation hole 33a in accordance with the protrusion 33b, and the protruding button 40 is placed thereon so that the coil spring 41 is accommodated in the recess 40b. At this time, the protruding button 40 is supported by the coil spring 41, and at least a part of the lower part 40b enters the storage hole 33a, and the upper part protrudes from the storage part 33a. Next, the lens barrel 22 is aligned with the inner side of the frame 24 from the rear of the frame 24, and the protruding button 40 protruding in the guide groove 39 is pressed against the urging force of the coil spring 41. When is pushed, the protruding button 40 is inserted into the engaging hole 28 by the urging force of the coil spring 41 when reaching the engaging hole 28, and the state shown in FIG.
The same applies to the lens barrel fixing portion 34.
In FIG. 7, in the lens barrel fixing portions 33 and 34, the step 40 e of each protruding button 40 is in a state of pressing the step 24 c of the frame 24 by the biasing force of the coil spring 41. Moreover, the upper part 40a of each protrusion button 40 is rotatable with respect to the engagement holes 38a and 38b. Therefore, the lens barrel 22 is pivotally supported so as to be rotatable in the vertical direction in FIG.

When the frame 24 is attached to the arm 25, the frame fixing portion 35 and the frame fixing portion 36 are attached in the same manner as the structure in which the lens barrel 22 is fixed to the frame 24 using the protruding button 40 and the coil spring 41.
As shown in FIG. 5, the frame fixing portions 35 and 36 of the frame 24 also have storage holes (second storage holes) 35a, 36a having the same shape and size as the lens barrel fixing portions 33 and 34, respectively. Protrusions (spring supporting protrusions) 35b and 36b are provided. A coil spring 41 and a projecting button (second in / out member) 40 are fitted in each of the storage holes 35a and 36a.

8 and 9 are partial cross-sectional views showing how the frame 24 is attached to the arm 25. FIG. When the frame 24 is fixed to the arm 25, in the frame fixing portion 36, the coil spring 41 is inserted into the storage hole 36a in accordance with the protrusion 36b, and the protruding button 40 is put on. Next, when the frame 24 is moved in a state in which the protruding button 40 is pressed against the lower portion 25c of the arm 25, when the protruding button 40 reaches the engaging hole 26b, the protruding button 40 is inserted into the engaging hole 26b by the biasing force of the coil spring 41. The state of FIG. 9 is obtained.
Similarly, in the frame fixing portion 35, when the coil spring 41 and the protruding button 40 are fitted in the storage hole 35a, the protruding button 40 is inserted below the upper portion 25a of the arm 25 and reaches the engaging hole 26a. The button 40 is inserted into the engagement hole 26 a by the urging force of the coil spring 41.

  In FIG. 9, the step 40 e of each protruding button 40 is in a state where the back surface around the engagement holes 26 a and 26 b of the arm 25 is pressed by the biasing force of the coil spring 41. Moreover, the upper part 40a of each protrusion button 40 is rotatable with respect to the engagement holes 26a and 26b. Accordingly, the frame 24 is pivotally supported so as to be pivotable in the left-right direction in FIG.

Next, the optical axis adjusting means 50 of the lens barrel 22 will be described. The optical axis adjustment means 50 includes adjustment screws 51 and 52, a left / right adjustment portion 53 provided on the frame 24, a vertical adjustment portion 54 provided on the lens barrel 22, and the like.
FIG. 10 shows the adjustment screw 51. Since the adjustment screw 52 is also configured in exactly the same way as the adjustment screw 51, hereinafter, the reference numerals of the respective parts of the adjustment screws 51 and 52 will be described with the same reference numerals.

The adjusting screw 51 is a knob member of the present invention including an operation knob 55 and a shaft portion 56. The operation knob 55 has a disk shape, and is knurled along the peripheral edge portion 55a so as to be easily rotated, and is uniformly finely cut.
Further, a concave surface 55b is formed on the front surface of the operation knob 55. The concave surface 55b is slightly depressed inward from the peripheral edge portion 55a.

On the front surface of the concave surface 55b, as shown in FIG. 11A, the adjustment method of the operation knob 55, the operation direction of the operation knob 55 when the operation knob 55 is operated by this adjustment method, and the driving of the lens barrel 22 A display portion 55c is provided on which the correspondence relationship with the direction to be displayed is displayed. In other words, the display portion 55c of the adjustment screw 51 displays that the lens barrel 22 is directed to the right when the operation knob 55 is rotated to the right, and the lens barrel 22 is directed to the left when the operation knob 55 is rotated to the left. On the other hand, the display portion 55c of the adjustment screw 52 displays that the lens barrel 22 is directed downward when the operation knob 55 is rotated to the right and turned upward by being rotated to the left. Each arrow and the characters “left, right, up, down” shown in FIG. 11A are formed on a nameplate containing a fluorescent dye, and the nameplate is attached to the adjusting screws 51 and 52 to form the display portion 55c. .
As shown in FIG. 10B, a part of the shaft portion 56 is threaded to form a screw portion 56a. As shown in the drawing, the screw portion 56a may be only a part of the shaft portion 56, and a length sufficient for rotating the lens barrel 22 is sufficient. At the tip of the screw portion 56a, a cut 56b is further formed along the circumferential direction.

As shown in FIGS. 11, 13, and 14, the adjustment screws 51 and 52 are fitted with an adjustment spring 60 and a washer 61 in order from the side closer to the operation knob 55, and a round nut 62 is screwed into the screw portion 56a. The E-ring 63 is fitted to the notch 56b and attached to the left / right adjustment unit 53 and the vertical adjustment unit 54.
Here, the washer 61 is a ring-shaped flat plate having a hole that can easily pass through the shaft portion 56 of the adjusting screw 51, and has a size that cannot pass through an opening 53a described later. The round nut 62 has a cylindrical shape, and has a through-hole penetrating the circumferential surface, and a screw that is screwed into the screw portion 56a is cut into the through-hole. The E-ring 63 is provided to prevent the round nut from coming off.
The screw portions 56a of the adjusting screws 51 and 52 are threaded in such a direction that the round nut 62 is removed when the adjusting screws 51 and 52 are turned to the right in FIG.

As described above, the frame 24 is provided with the left / right adjustment portion (second aperture member) 53. FIG. 12A shows a state in which the left / right adjusting portion 53 is viewed from the back side. When viewed from the back (rear side), the left / right adjustment portion 53 has an octagonal opening 53a that combines two rectangles as shown in FIG.
As shown in FIG. 7, the opening 53a is formed in a rectangular shape that is long in the lateral direction when viewed from the front. That is, the upper and lower ends of the front side of the opening 53a are closed, and the round nut 62 is in contact with the opening 53a. It is the receiving plates 53b and 53c for contacting. Here, a rectangular opening when the opening 53a is viewed from the front is referred to as an opening 53aa. The opening 53aa has a size that allows the round nut 62 to pass through.
The rectangular region on the right side of the opening 53a indicated by the phantom line in FIG. 12 (a) is a size and shape that can be accommodated with the round nut 62 in contact with almost no gap, and includes the receiving plates 53b and 53c. Thus, a nut storage portion 57 in which the round nut 62 can be accommodated is formed.

A method of attaching the adjusting screw 51 to the frame 24 in the left / right adjusting portion 53 will be described with reference to FIG.
As shown in FIG. 13 (a), an adjustment spring 60, a washer 61, a round nut 62, and an E-ring 63 are fitted into the tip of the adjustment screw 51 in a state where it passes through the shaft hole 25e of the arm 25, and an opening 53aa is formed. Insert from the side. At this time, the round nut 62 is maintained in a direction that becomes longer in the lateral direction in accordance with the shape of the opening 53aa. As is, the washer 61 is inserted until it comes into contact with the peripheral portion of the opening 53aa as shown in FIG. When the washer 61 comes into contact with the periphery of the opening 53aa, the adjustment spring 60 is compressed between the washer 61 and the shaft portion holding portion 25d. In other words, the washer 61 is always pushed toward the nut side, and the shaft portion 56 of the adjustment screw 51 Is pulled to the operation knob 55 side.

Further, as shown in FIG. 6 (c), when the round nut 62 passes through the opening 53a on the back side of the left / right adjusting portion 53, the adjusting screw 51 is rotated 90 degrees, and the orientation of the round nut 62 is shown in FIG. As shown in d), it is oriented vertically.
If the hand that supports the adjustment screw 51 is released as it is, the space between the washer 61 and the round nut 62 is narrowed by the biasing force of the adjustment spring 60, that is, the round nut 62 is accommodated in the nut storage portion 57.

The round nut 62 once accommodated in the nut accommodating portion 57 is surrounded by the wall defining the opening 53a and is always pressed against the receiving plates 53b and 53c by the biasing force of the adjustment spring 60. The nut storage portion 57 does not easily come off.
The state in which the round nut 62 is pressed against the receiving plates 53 b and 53 c by the spring 60 always means that the receiving plates 53 b and 53 c are firmly sandwiched between the round nut 62 and the washer 61.

The horizontal direction of the lens barrel 22 is performed by adjusting the screwing amount of the round nut 62 attached to the left / right adjustment unit 53 by rotating the adjustment screw 51.
When the adjustment screw 51 is rotated to the right, the round nut 62 is directed toward the distal end of the shaft portion 56a, the distance between the operation knob 55 of the adjustment screw 51 and the nut 62 is increased, and the washer according to the urging force of the adjustment spring 60 is obtained. The left / right adjustment unit 53 is pushed backward via 61. Since the frame 24 is pivotally supported by the arm 25 via the protruding buttons 40 at the frame fixing portions 35 and 36, the frame 24 rotates counterclockwise around the protruding buttons 40 that engage with the frame fixing portions 35 and 36. The lens barrel 22 also rotates together, that is, the lens barrel 22 faces to the right when the smoke detector 100 is viewed from the front.

  When the adjustment screw 51 is rotated counterclockwise, the round nut 62 faces the operation knob 55 side of the adjustment screw 51, the distance between the operation knob 55 and the nut 62 is reduced against the biasing force of the adjustment spring 60, and the washer 61. The left / right adjustment portion 53 is pulled forward via The frame 24 rotates clockwise together with the lens barrel 22, that is, the lens barrel 22 faces to the left when the smoke detector 100 is viewed from the front.

On the other hand, the lens barrel 22 is provided with a vertical adjustment portion (first aperture member) 54. When viewed from the back, the vertical adjustment part 54 has a convex octagonal aperture 54a as shown in FIG. When viewed from the front, the opening 54a is formed in a rectangular shape that is long in the vertical direction as shown in FIG. 6, that is, the left and right ends of the front side of the opening 54a are closed, and the round nut 62 is in contact therewith. It is the receiving plates 54b and 54c for contacting. Here, a rectangular opening when the opening 54a is viewed from the front is referred to as an opening 54aa. The opening 54aa has such a size that the round nut 62 can easily pass therethrough.
In addition, the rectangular region below the opening 54a indicated by the phantom line in FIG. 12B is a size and shape that can be accommodated in a state where the round nut 62 is in contact, and includes the receiving plates 54b and 54c. Thus, a nut storage portion 58 that can accommodate the round nut 62 is provided.

The method of attaching the adjustment screw 52 to the vertical adjustment portion 54 is the same as described above, and will be described with reference to FIG.
As shown in FIG. 14A, an adjustment spring 60, a washer 61, a round nut 62, and an E-ring 63 are fitted into the tip of the adjustment screw 52 that is passed through the shaft hole 24b of the frame 24 to open the frame 24. It inserts from the hole 54aa side. At this time, the round nut 62 is maintained in a direction that becomes longer in the vertical direction in accordance with the shape of the opening 54aa. As shown in FIG. 5B, the washer 61 comes into contact with the peripheral portion of the opening 54aa, and further, as shown in FIG. Insert 62 until it passes, rotate the adjusting screw 52 by 90 degrees, and turn the round nut 62 sideways as shown in FIG.
If the hand that supports the adjusting screw 52 is released as it is, the space between the washer 61 and the round nut 62 is narrowed by the urging force of the adjusting spring 60, that is, the round nut 62 is stored in the nut storage portion 58.

The round nut 62 once stored in the nut storage portion 58 is surrounded by the wall defining the opening 54 a and is always pressed against the receiving plates 54 b and 54 c by the biasing force of the adjustment spring 60. The nut housing 58 does not easily come off.
The state in which the round nut 62 is pressed against the receiving plates 54 b and 54 c by the spring 60 always means that the receiving plates 54 b and 54 c are firmly sandwiched between the round nut 62 and the washer 61.

The vertical angle of the lens barrel 22 is determined by adjusting the screwing amount of the round nut 62 attached to the vertical adjustment unit 54 by rotating the adjustment screw 52.
When the adjustment screw 52 is rotated to the right, the distance between the operation knob 55 and the round nut 62 is increased, and the vertical adjustment portion 54 is pushed backward via the washer 61 by the urging force of the adjustment spring 60. The lens barrel 22 rotates downward about the protruding button 40 fitted in the lens barrel fixing portions 33 and 34.
When the adjustment screw 52 is rotated counterclockwise, the distance between the tip of the adjustment screw 51 and the nut 62 is shortened, and the vertical adjustment portion 54 is pulled forward via the washer 61 against the urging force of the adjustment spring 60. As a result, the lens barrel 22 rotates upward.

According to the smoke detector 100 described above, the lens barrel 22 is pivotally supported with respect to the frame 24 at the lens barrel fixing portions 33 and 34 so as to be rotatable in the vertical direction by the protruding button 40 and the coil spring 41. . The frame 24 is pivotally supported with respect to the arm 25 at the frame fixing portions 35 and 36 by a protruding button 40 and a coil spring 41 so as to be rotatable in the left-right direction.
In these shaft support structures, the annular step 40e of the projecting button 40 is always in a state of pressing the frame 24 or the arm 25 with a substantially constant force by the biasing force of the coil spring 41. Compared to the above, it is possible to realize a smooth rotation with no wobbling and high-precision optical axis adjustment work.
Further, unlike the conventional photoelectric separation type sensor, the lens barrel 22 is directly supported on the first straight line and supported on the second straight line via the frame 24. Since it is pivotally supported at four places on two orthogonal straight lines, a strong pivotal support structure with no backlash in this respect is obtained.

  In addition, the four storage holes 33a, 34a, 35a, and 36a in which the coil spring 41 is accommodated are formed to a certain depth, the coil spring 41 has a length that can be substantially accommodated in the storage holes, and the lower portion 40b of the protruding button 40 is provided in each storage hole. Since the recess 40c is formed on the back side and the head of the coil spring 41 is covered by the recess 40c, the length of the coil spring 41 is sufficiently long to obtain a sufficiently stable urging force. In addition, the length from each storage hole to the protruding button 40 becomes compact.

Further, with such a structure, the assembly work in the storage holes 33a, 34a, 35a, 36a can be performed by simply dropping the coil spring 41 into each storage hole and placing the protruding button 41 on the coil spring 41. Since the lower part 40b of the button 40 also enters the storage hole, the assembling work is facilitated.
Moreover, since the projections 33b, 34b, 35b, and 36b are provided at the bottoms of the four accommodation holes 33a, 34a, 35a, and 36a, the coil spring 41 is set upright in each accommodation hole by aligning the coil spring 41 with these projections. Therefore, the assembly becomes easier.

Further, when the frame 24 is assembled to the arm 25, the lower portions 40b of the upper and lower protruding buttons 40 are inserted into the storage holes 35a and 36a. When the frame 24 is moved to the engagement holes 26a and 26b formed in the arm 25, the protruding buttons 40 and 40 are automatically moved by the urging force of the upper and lower coil springs 41. , 26b.
When the lens barrel 22 is assembled to the frame 24, the protruding buttons 40 on both outer sides of the lens barrel 22 are lightly pressed so that they are fitted into the guide grooves 39 of the frame 24, and the engagement holes are formed along the guide grooves 39. When each projecting button 40 is moved to 38a, 38b, the projecting buttons 40, 40 are automatically engaged with the engagement holes 38a, 38b by the urging force of the left and right coil springs 41.
Therefore, in any of the assembling operations, the assembling can be made much easier than fixing with screws or the like. In particular, the space between the lens barrel 22 and the frame 24 can be more easily assembled due to the presence of the guide groove 39.
Further, a chamfered portion 40d is formed on the upper portion 40a of the protruding button 40 so that it can be easily fitted into each engagement hole.

  As described above, the shaft support structure between the lens barrel 22 and the frame 24 and between the frame 24 and the arm 25 in the smoke detector 100 is very easy to assemble by using the protruding button 40 and the coil spring 41. However, a stable and smooth rotation operation is realized so as to sufficiently satisfy the accuracy and workability required for the optical axis adjustment work.

Further, according to the optical axis adjusting means 50, the washer 61 and the round nut 62 are always sandwiched between the receiving plates 53c and 53c or the receiving plates 54b and 54c by the urging force of the adjusting spring 60. As the amount of screwing of the round nut 62 into the threaded portion 56a is changed by rotating 51, 52, the frame 24 and the lens barrel 22 are always rotated together with the round nut 62, so the amount of rotation of the adjusting screws 51, 52 The optical axis of the lens barrel 22 can be adjusted smoothly and with high accuracy without any deviation in the relationship between the rotation amount of the lens barrel 22 and the frame 24 with respect to the lens.
In addition, since the round nut 62 has a cylindrical shape, the contact area with the lens barrel 22 and the frame 24 is constant, and the force applied to the lens barrel 22 and the frame 24 does not change so much. The optical axis can be adjusted in the state.

  Further, even if the angle of the frame 24 or the lens barrel 22 with respect to the shaft portion 56 of the adjustment screws 51 and 52 changes with the adjustment work, the round nut 62 has a cylindrical shape. Since only the contact position of the curved nut 62 with respect to the nut housing portion 57 changes, and when the vertical nut rotates, only the contact position of the round nut 62 with respect to the curved nut storage portion 58 changes. An excessive force is not applied to the lens barrel 22, and each member is not distorted.

  In addition, since the left and right adjustment portions 53 and the vertical adjustment portion 54 have openings 53a and 54a having receiving plates 53b, 53c, 54b, and 54c in a shape that combines two rectangular parallelepipeds, the adjustment screw 51 , 52 is inserted into the openings 53a, 54a and the adjusting screws 51, 52 are rotated, and the urging force of the adjusting spring 60 is used to rotate the nut housings 57, 58 into a circular shape. Since the nut 62 can be stored, it can be assembled very easily.

  In the optical axis adjusting means 50, as shown in FIG. 11A, the adjusting screws 51 and 52 are provided with a display portion 55c indicating “left, right, up, down” along with arrows. Whether the adjustment screws 51 and 52 correspond to the adjustment in the horizontal direction or the vertical direction of the lens barrel 22, and in which direction the adjustment screws 51 and 52 are rotated in the mirror direction. It can be readily seen in which direction the barrel 22 rotates. Therefore, the optical axis adjustment operation can be easily performed without being confused by the determination of the selection of the adjustment screws 51 and 52 or the rotation direction.

Moreover, since the display part 55c consists of a nameplate containing a fluorescent paint, when it installs in dark places, such as a high ceiling of a large-sized sports facility, it is easy to visually check.
Further, since the display portion 55c is provided on the concave surface 55b that is lower than the peripheral edge portion 55a, even if the knob is touched during adjustment work, the concave surface 55b is not touched so much that the seal may be peeled off or characters or It is difficult to cause the arrow to wear out and is suitable for long-term use. Moreover, when sticking a nameplate that it is concave, it is easy to position.
Further, with respect to the adjustment screw 51, when the operation knob 55 is rotated to the right, the lens barrel 22 is also directed to the right, and when the operation knob 55 is rotated to the left, the lens barrel 22 is also directed to the left. In this respect, the operation becomes easy.

The photoelectric separation type sensor of the present invention is not limited to the above embodiment, but can be appropriately changed in specific structure, shape, and the like.
For example, in the smoke detector 100, the rotation direction of the adjustment screw 51 and the lens barrel 22 are sensuously matched, but an adjustment screw for adjusting the vertical direction is provided on the side of the lens barrel 22 instead of the adjustment screw 52. The adjusting screw may be configured such that the rotational direction in the vertical direction of the lens barrel coincides sensuously.
In addition, the same member was used for the projecting button, the spring, the storage hole, and the engagement hole constituting the pivotal support structure of the lens barrel and the frame and the pivotal support structure of the frame and the arm. Other shaft support structures may have different sizes and shapes with respect to the support structure. However, the cost can be reduced by using the same member as in the present embodiment.

It is a figure which shows an example of the photoelectric separation-type sensor of this invention, (a) is a front view, (b) is a side view. It is a side view which shows the state which opened the front cover of the photoelectric separation-type sensor of FIG. It is a longitudinal cross-sectional view which shows the main body incorporated in the photoelectric separation-type sensor of FIG. It is a perspective view which shows a lens barrel. It is a longitudinal cross-sectional view which shows a frame. It is the figure which decomposed | disassembled the lens barrel, the protrusion button, and the spring, and was seen from the front, the left half is shown in the top view, and the right half is shown as sectional drawing. It is the figure which looked at a mode that the lens barrel was attached to the frame, from the front, the left half is shown in a top view, and the right half is shown partially as a sectional view. It is the state which attached the lens barrel to the frame, it is the figure which decomposed | disassembled the protrusion button and the spring, and was seen from the front, and only the part of the frame fixing | fixed part 36 is shown as sectional drawing. It is the figure which looked at a mode that the frame of FIG. 8 was attached to the arm from the front, and has shown only the part of the frame fixing | fixed part 36 and the engagement hole 26b as sectional drawing. It is a figure which shows an adjustment screw, (a) is a front view of an operation knob, (b) is a side view of the whole adjustment screw, and a part of operation knob is broken and shown. It is a figure which shows a main body, (a) is a front view, (b) is a side view. (A) is a figure which shows the left-right adjustment part provided in the frame, (b) is a figure which shows the up-down adjustment part provided in the lens barrel. It is a figure for explaining the process of attaching the round nut screwed to the adjustment screw to the right-and-left adjustment part of Drawing 12 (a) later on with Drawing 13 (a)-(e), and an operation knob part is Omitted. FIGS. 14A to 14E are views for explaining the process of attaching a round nut screwed to the adjustment screw to the vertical adjustment portion of FIG. is doing. It is a figure which shows the conventional photoelectric separation-type sensor, (a) is a front view, (b) is a side view.

Explanation of symbols

100 smoke detector (photoelectric separation type detector)
10 front cover 11 body case 20 body 21 circuit housing part 22 lens barrel (holding member)
23 lenses 24 frames (frame)
24a shaft portion holding portion 24b shaft portion hole 24c step 25 arm (frame support member)
25a upper part 25b back part 25c lower part 25d shaft part holding part 25e shaft part holes 26a, 26b engagement holes (frame body engagement holes)
30 peephole 31a mirror 32 daylighting hole 33, 34 barrel fixing part 33a, 34a storage hole (first storage hole)
33b, 34b protrusions (spring supporting protrusions)
35, 36 frame fixing part 35a, 36a storage hole (second storage hole)
35b, 36b protrusions (spring supporting protrusions)
38a, 38b engagement hole (holding member engagement hole)
39 Guide groove 40 Protruding button (protruding member)
40a upper part 40b lower part 40c concave part 40d chamfered part 40e step 41 coil spring 50 optical axis adjusting means 51, 52 adjusting screw (knob member)
53 left / right adjustment part (second aperture member)
53a opening 53b, 53c receiving plate 54 vertical adjustment part (first opening member)
54a opening 54b, 54c receiving plate 55 operation knob 55a peripheral portion 55b concave surface 55c display portion 56 shaft portion 56a screw portion 56b notch 60 adjustment spring 61 washer 62 round nut 63E ring

Claims (8)

A light emitter having a light emitting means for emitting light and a light receiver having a light receiving means for receiving light emitted from the light emitter are arranged separately, and detects the presence or absence of smoke therebetween,
The emitter and receiver are respectively
A holding member that holds the light emitting means and the light receiving means, and is rotatable about a first straight line perpendicular to the optical axis of the light emitting means and the light receiving means;
A support member that supports the holding member and is rotatable about a second straight line orthogonal to the optical axis and the first straight line;
In order to adjust the optical axes of the light emitting means and the light receiving means, a first adjusting means for rotationally driving the holding member about the first straight line, and a second for rotationally driving the support member about the second straight line In a photoelectric separation type sensor comprising an optical axis adjustment means comprising an adjustment means,
Each of the first adjusting means and the second adjusting means includes an operation knob and a knob member including a threaded shaft portion, a spring fitted in the shaft portion, and a shaft portion fitted at the tip of the spring. A washer, and a nut screwed into the screw of the shaft portion at the tip of the washer,
The holding member is provided with a first aperture member having an aperture through which at least the shaft portion can be inserted and the washer cannot be inserted,
The first adjusting means is attached so that the washer and the nut sandwich the first opening member by the biasing force of the spring,
The support member is provided with a second aperture member having an aperture through which at least the shaft portion can be inserted and the washer cannot be inserted,
The second adjusting means is a photoelectric separation type sensor, wherein a washer and a nut are attached so as to sandwich the second aperture member by the biasing force of the spring. Each of the first opening member and the second opening member is provided with a nut storage portion that stores the nut in contact with the nut,
The nut has a curved surface having an arc-shaped cross section, and is screwed into the shaft portion so that the shaft portion passes through the curved surface, and the nut housing portion of the curved surface as the holding member and the support member rotate. The photoelectric separation type sensor according to claim 1, wherein the photoelectric separation type sensor is housed in a nut housing portion so that a position of contact with the sensor changes.   The photoelectric separation type sensor according to claim 2, wherein the nut is a round nut having a cylindrical shape. The opening formed in the first opening member and the second opening member is formed in a shape into which a nut can be inserted from the operation knob side,
The nut storage portion is continuous with the opening and can store the nut inserted through the opening in a direction rotated by a predetermined angle in a plane orthogonal to the insertion direction. Photoelectric separation type sensor. Each of the light emitter and the light receiver includes a knob member that drives the holding member in a predetermined direction in order to adjust an optical axis of the light emitting means and the light receiving means by operating an operation knob.
In both the light emitter and the light receiver,
The operation knob is provided with a display unit that displays an adjustment method of the operation knob and a correspondence relationship between the operation direction of the operation knob when the operation knob is operated by this adjustment method and the direction in which the holding member is driven. The photoelectric separation type sensor according to any one of claims 1 to 4, wherein the photoelectric separation type sensor is provided.   The photoelectric separation sensor according to claim 5, wherein the display unit includes a light emitting material.   The photoelectric separation type sensor according to claim 5 or 6, wherein the display part is formed in a concave surface which is depressed more than a peripheral part thereof.   The photoelectric separation type sensor according to any one of claims 5 to 7, wherein an operation direction of the operation knob displayed on the display unit and a direction in which the holding member is driven coincide with each other. .

Images