JP2008157665A - Photodetector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photodetector of simple constitution capable of manufacturing, while changing the fixing direction of an optical sensor that corresponds to the specification by aiming at commonalization of constituents. <P>SOLUTION: At the tip of the rod holder, either the first sensor holding part which points in the axial direction of the holder, or a second sensor holding part that holds the optical sensor in the lateral direction of the holder, is provided; further, the first and the second sensor holding parts, the lead wire of the optical sensor selectively chosen between the two is mounted from the front-face side; and the guidance part is provided in the holder of the circuit substrate that leads to the holder part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a photodetector in which an optical sensor is attached to the tip of a rod-shaped holder.

An optical detector used for monitoring and controlling the combustion state by detecting a flame such as an oil burner incorporates, for example, an optical sensor at the tip of a rod-shaped holder, and an optical sensor drive unit inside the holder. It has a structure that incorporates a circuit board. The cable connected to the circuit board is pulled out from the rear end portion of the holder so as to be connected to the burner combustion control device. This type of photodetector is used by being mounted on a blower fan, for example (see, for example, Patent Document 1).
JP-A-8-261443

  By the way, the optical sensor described above is generally provided at the tip of the holder so as to be directed forward in the axial direction of the holder. However, in many cases, a photodetector provided with an optical sensor so as to be directed to the side of the holder is often required due to restrictions on the mounting location of the photodetector. However, although it is easy to realize the two types of photodetectors with different orientations of the above-described photosensors, it is necessary to prepare two types of holders with different photosensor support structures. There is no denying that manufacturing management becomes complicated.

  The present invention has been made in consideration of such circumstances, and its purpose is to make the components common and to make a simple structure that can be manufactured by changing the mounting direction of the optical sensor according to the specifications. An object of the present invention is to provide a photodetector.

In order to achieve the above-described object, the photodetector according to the present invention is a sensor in which a photosensor and a circuit board to which the photosensor is connected are incorporated in a rod-shaped holder,
The holder has a first sensor holding portion that holds the photosensor in a direction oriented in the axial direction of the holder at a tip portion thereof, or a second that holds the photosensor in a direction oriented in the lateral direction of the holder. And a lead wire of the optical sensor, which is alternatively attached to the first and second sensor holding portions from the front side thereof, is led to the holding portion of the circuit board. A guide portion is provided.

  In the photodetector according to the present invention, a first sensor holding portion that holds the optical sensor in a direction toward the axial direction of the holder at a tip portion of the holder, and a direction that points in a lateral direction of the holder. A second sensor holding portion for holding the photosensor, and a lead wire of the photosensor that is alternatively attached to the first and second sensor holding portions from the front side thereof. It is characterized in that a structure is provided in which a guide portion that leads to the holding portion of the substrate is provided.

  Incidentally, each of the first and second sensor holding portions has a fitting recess into which a circular photosensor having a predetermined thickness is fitted from the front side, and a lead wire led out from the back side of the photosensor is provided at the bottom. This is realized as a through-hole to be inserted. In particular, the holder is provided with a substantially round bar-shaped tip part slightly larger than the outer diameter of the optical sensor. The first sensor holding part is provided on the tip surface of the tip part, and the first sensor This is realized by providing the second sensor holding part on the side surface of the tip part located on the back side of the holding part.

  The guide portion is provided so as to face a through hole provided in the first sensor holding portion across a space forming the second sensor holding portion, from the front side of the first sensor holding portion. When the optical sensor is mounted, the lead wire inserted through the through hole may be guided to the soldering portion of the circuit board while being bent along the guide portion as the optical sensor is pushed.

  According to the photodetector provided with the holder having the above structure, the optical sensor can be mounted in the first sensor holding part or the second sensor holding part according to the specification so that the axial front of the holder can be viewed. It is possible to easily realize a photodetector provided with a photosensor or a photodetector provided with a photosensor in a direction of viewing the side of the holder. In particular, it is only necessary to provide the first and second sensor holding portions having the above-described concave shape at the tip of the holder, so that the photo detectors differ in the viewing direction of the photo sensor (light detection direction by the photo sensor). Therefore, it is possible to produce a large number of practical effects, for example, by making the components common to each other.

Hereinafter, a photodetector according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of a photodetector according to this embodiment, and FIG. 2 is a perspective view showing a partial cross-section for explaining the schematic configuration. This photodetector includes an optical sensor 1 composed of a CdS cell, a phototransistor, and the like, a circuit board 3 that forms a drive unit of the optical sensor 1, and a holder 10 that holds a cable 5 connected to the circuit board 3, and the holder 10 A cylindrical case (holder holder) 50 for storing the light, a translucent cover 60 attached to the tip of the case 50 to protect the optical sensor 1, and a flange body 70 attached to the middle part of the case 50. And is configured.

  The holder 10, the case 50, and the flange body 70 are general synthetic resin parts manufactured by injection molding nylon or the like having excellent elasticity and oil resistance. The transparent cover 60 is also elastic and elastic. This is a transparent synthetic resin part made by injection molding of nylon with excellent oil resistance. The flange body 70 is an auxiliary part for attaching a photodetector to a flame detection site such as an oil burner.

  As shown in a perspective view of the overall structure in FIG. 3, the holder 10 forms a holding portion for the optical sensor 1 at the tip portion 20 and also forms a support portion for the circuit board 3 at the intermediate portion 30. Further, a long holder body 11 in which a cable holding portion for holding the cable 5 is formed at the rear end portion 40 is connected to a side portion of the rear end portion 40 of the holder main body 11 through a thin hinge portion 12. Holder cover 13. The holder cover 13 is superimposed on the upper surface of the rear end portion 40 of the holder main body 11 by bending the hinge portion 12, and holds the cable 5 between the holder main body 11 and the holder main body 11 as will be described later. It is.

  FIG. 4A is a plan view showing a schematic overall structure of the holder 10, and FIG. 4B is a cross-sectional view showing a state where the circuit board 3 is assembled to the holder 10. As shown in FIGS. 4A and 4B and FIG. 3 described above, the tip 20 of the holder 10 is roughly a cylindrical body having a diameter slightly larger than the outer diameter of the optical sensor 1. Has an external shape that is flattened by chamfering in parallel in a plane along the axial direction. A concave first sensor holding portion 21 corresponding to the shape of the optical sensor 1 is formed on the distal end surface of the distal end portion 20, and the first sensor is disposed on the chamfered side surface of the distal end portion 20. A concave second sensor holding part 22 is formed on the rear side of the holding part 21. In addition, through holes 23 and 24 through which the lead wires 2 of the optical sensor 1 are inserted are respectively provided on the bottom surfaces of the concave sensor holding portions 21 and 22.

  Furthermore, the lead wire 2 of the optical sensor 1 mounted on the first sensor holding portion 21 is supported by the intermediate portion 30 described above at the rear side position of the second sensor holding portion 22 in the tip portion 20. A guide portion 25 is formed to guide the soldering portion of the circuit board 3 to be soldered. The guide portion 25 has an opening on the surface facing the through hole 23 of the second sensor holding portion 22 and forms an inclined surface whose height gradually increases toward the rear end side of the holder 10. The first guide portion 25a and the inclined surface which defines the first guide portion 25a in the width direction of the holder 10 and gradually expands toward the rear end side of the holder 10 toward the outer side in the width direction. The second guide portion 25b is formed.

  By guiding the lead wire 2 of the optical sensor 1 inserted through the through hole 23 of the first sensor holding portion 21 described above into the guide portion 25 having the first and second guide portions 25a and 25b. When the optical sensor 1 is attached to the first sensor holding portion 21, that is, as the lead wire 2 is pushed, the lead wire 2 is on the upper surface side of the holder 10 along the slope described above and the width of the holder 10 Laying in the direction. The leading end portion of the lead wire 2 is positioned at a soldering portion provided at the leading end portion of the circuit board 3 supported by the intermediate portion 30 described above.

  When the optical sensor 1 is attached to the second sensor holding portion 22 described above, the lead wire 2 of the optical sensor 1 is pulled out to the upper surface side of the holder 10 through the through hole 24 described above. In this way, the lead wire 2 drawn to the upper surface side of the holder 10 is bent toward the rear end side of the holder 10. Then, the lead wire 2 is laid in the width direction of the holder 10 along the inclined surface of the second guide portion 25b described above, and the tip portion of the circuit board 3 supported by the intermediate portion 30 as described above. It is positioned in the soldering part provided in the front-end | tip part.

  On the other hand, the intermediate portion 30 of the holder 10 that is provided continuously to the tip portion 20 and forms the support portion of the circuit board 3 has a generally bowl-like shape that halves a cylindrical body, A central rib 31 extending in the axial direction of the holder 10 is provided at the center of the inner side, and a plurality of ribs 32 extending in the radial direction are formed. These ribs 31 and 32 play a role of thinning the resin material forming the intermediate portion 30 of the holder 10 while maintaining its strength.

  Three kinds of engaging portions 33, 34, and 35 for positioning and supporting the tip portion of the circuit board 3 are formed at the boundary portion between the intermediate portion 30 and the tip portion 20. A post 37 that engages with a positioning hole 3 b provided in the circuit board 3 is formed on the central rib 31, and a rear end of the circuit board 3 is formed at a boundary portion between the intermediate portion 30 and the rear end portion 40. A pedestal portion 38 for positioning and supporting the portion is provided.

  The above-described three types of engaging portions 33, 34, and 35 are specifically provided at the edge in the width direction of the intermediate portion 30, and the stepped portion 33 that supports the tip portion of the circuit board 3 from its lower surface side, An engaging protrusion 34 provided at the center in the width direction of the intermediate portion 30 to engage the tip of the circuit board 3 from the upper surface side to prevent the circuit board 3 from lifting, and the central rib 31 It is formed of a projecting piece 35 that extends in the vertical direction and engages with a cut groove 3 a provided at the tip of the circuit board 3 to regulate the support position in the width direction of the circuit board 3. The rear end surface of the guide portion 25 located at the boundary between the front end portion 20 and the intermediate portion 30 and at the back of the stepped portion 33 and the engagement protrusion 34 is in contact with the front end portion of the circuit board 3. It contacts and plays the role which regulates the attachment position of the longitudinal direction of this circuit board 3. FIG.

  The engaging portions 33, 34, and 35 are brought into contact with each other, that is, the cut groove 3 a of the circuit board 3 is engaged with the protruding piece 35, and the tip of the circuit board 3 is connected to the stepped portion 33. By fitting into the space in the height direction between the engagement protrusions 34, the holding position of the tip portion of the circuit board 3 is stably positioned. In this state, the entire circuit board 3 is positioned on the upper surface of the intermediate portion 30 so that the positioning hole 3b provided in the circuit board 3 is fitted into the post 37 described above, and the lower surface of the rear end of the circuit board 3 is the pedestal. The circuit board 3 is positioned more stably by being placed on the portion 38.

  The cable 5 soldered to the rear end side of the circuit board 30 is disposed along the rear end portion 40 of the holder main body 11 and drawn out from the rear end portion of the holder 10. In this state, the cable 5 is sandwiched and held between the holder cover 13 and the holder main body 11 by superimposing the holder cover 13 on the upper surface of the rear end portion 40 of the holder main body 11. At the same time, the rear end portion of the circuit board 3 is sandwiched between the holder cover 13 and the holder body 11. Then, the circuit board 3 is engaged with the holder main body 11 by engaging the front end portion thereof with the engaging portions 33, 34, and 35, and sandwiching the holder cover 13 and the holder main body 11 at the rear end portion. Firmly held.

  That is, the front edge portion of the holder cover 13 is formed as a stepped portion 14 that faces the pedestal portion 38 with the thickness of the circuit board 3 with respect to the upper surface of the pedestal portion 38 described above. When the holder cover 13 is overlaid on the upper surface of the rear end portion 40 of the holder 10, the stepped portion 14 presses the rear end portion of the circuit board 3 placed on the pedestal portion 38 from the upper surface side, Accordingly, the rear end portion of the circuit board 3 is held between the base portion 38 and the circuit board 3. In particular, the circuit board 3 is clamped when the holder 10 is mounted inside the above-described cylindrical case (holder support) 50 as described later, as shown in FIG. This is performed more firmly by pressing the cover 13.

  Therefore, since the circuit board 30 and the cable 5 are sandwiched between the holder body 11 and the holder body 11 at the same time while maintaining the positional relationship between the circuit board 30 and the cable 5 determined by the connection state, the circuit board 30 and the cable 5 are described above even after being mounted on the holder 10. The positional relationship is maintained as it is. Therefore, unintentional stress is not applied to the soldered portion between the circuit board 30 and the cable 5, and the connection reliability can be improved. Furthermore, since the holder 10 has a structure in which the holder cover 13 is integrally provided on the holder main body 11 via the thin hinge portion 12 as described above, there is an advantage that the structure is simple and can be manufactured at low cost. .

  In addition, a U-shaped cut groove 41 along the axial direction of the holder 10 is formed in the rear end portion 40 of the holder body 11 and the substantially central portion of the holder cover 13. These cut grooves 41 are defined by main portions of the holder main body 11 and the holder cover 13, and are hooks supported by connecting one end of the intermediate portion 30 side to the main portions of the holder main body 11 and the holder cover 13. It is formed as a piece 42. That is, the hook piece 42 is formed as a tongue piece formed along the axial direction of the holder body 11 and exhibiting an elastic action in the surface direction.

  The hook pieces 42 have their tip portions protruding outward from the outer peripheral surfaces of the holder main body 11 and the holder cover 13 and penetrate the peripheral surface of the cylindrical case (holder support) 50 described above. Engaging protrusions 43 that engage with the fitting recesses 51 provided respectively. These engaging projections 43 prevent the holder 10 from being pulled out of the case 50 by engaging the fitting recess 51 of the case 50 as shown in FIG. 5 when the holder 10 is inserted into the case 50 described above. Take a role. In addition, protrusions 44 are provided on the inner side of the hook pieces 42 so as to face each other and sandwich the cable 5. These protrusions 44 play a role of firmly sandwiching the cable 5 by a reaction force acting on the hook piece 42 engaged with the fitting recess 51 described above.

  That is, in the state where the holder 10 is fitted into the case 50 and the engaging protrusions 43 of the hook pieces 42 facing each other are engaged with the respective fitting recesses 51, the distance between the tips of the respective protruding portions 44 facing each other is the cable. It is made slightly smaller than the outer diameter of 5. Further, the outer surface of each hook piece 42 is restricted in displacement in the diameter increasing direction by the inner surface of the case 50. Therefore, the tips of the projecting portions 44 facing each other slightly bite into the sheath of the cable 5, and a radial compressive force acts on the cable 5, and the inner surface of the case 50 from the outer surface of each hook piece 42. A pressing force is applied to the surface. Therefore, the holder 10 that holds the cable 5 between the holder main body 11 and the holder cover 14 is simply fitted into the case 50, so that the holder 10 can be securely prevented from being detached from the case 50, and at the same time, the cable 10 is connected to the holder 10 by the holder 10. It becomes possible to hold firmly.

  By holding the cable 5 firmly with the holder main body 11 and the holder cover 13 provided with such a hook piece 42, the rear end portion of the circuit board 3 is held between the stepped portion 14 and the pedestal portion 38. Together, the circuit board 3 and the cable 5 are integrally held firmly. Therefore, unintentional stress is not applied to the soldered portion between the circuit board 3 and the cable 5. Therefore, after assembling the optical sensor 1 and the circuit board 3 to the holder 10, the holder 10 in which the cable 5 connected to the circuit board 3 is pulled out from the rear end is attached to the cylindrical case 50 described above from the front end 20 side. Simply plug it in and you can easily assemble the photodetector. Then, as described later, the above-described transparent cover 60 is attached to the tip of the case 50, whereby the photodetector having the structure shown in FIGS. 1 and 2 is completed.

  Here, the assembly structure of the transparent cover 60 to the tip of the case 50 will be described. The case 50 having a substantially cylindrical appearance has an in-cylinder shape that matches the appearance of the holder 10 having the flattened tip portion 20 as described above. Therefore, the holder 10 can be attached to the case 50 only in a state where the orientation of the holder 10 is aligned with the case 50.

  As shown in FIG. 6, the first and second sensor holdings provided at the tip 20 of the holder 10 as shown in FIG. Two openings 51 and 52 facing the portions 21 and 22 are formed. That is, the front end surface of the case 50 is provided with a first opening 51 that exposes the light receiving surface of the optical sensor 1 attached to the first sensor holding portion 21 toward the front in the axial direction. A second opening 52 that exposes the light receiving surface of the optical sensor 1 attached to the second sensor holding portion 22 toward the side that is the radial direction is provided on the side surface of the distal end portion.

  Further, a shallow groove 53 having a predetermined width is provided on the outer peripheral surface of the front end portion of the case 50 so as to include the openings 51 and 52 from the front end surface to both side surfaces. The shallow groove 53 forms a mounting portion for the transparent cover 60 described above. Further, a pair of engaging projections 54 are formed so as to protrude from both sides of the bottom of the shallow groove 53 and avoiding the openings 51 and 52. These engagement protrusions 54 play a role of preventing the unintentional dropout of the transparent cover 60 attached to the distal end portion of the case 50 by engaging with a fitting hole 63 provided in the transparent cover 60.

  That is, the transparent cover 60 attached to the front end portion of the case 50 has a main body portion 61 positioned on the front end surface of the holder 10 as shown in FIG. A pair of legs 62 sandwiching the tip of the holder 10 from both side surfaces thereof is provided. One of the pair of leg portions 62 is set longer than the other leg portion 62 so as to cover the second opening 52 described above. Further, the pair of leg portions 62 are provided with fitting holes (fitting portions) 63 that are respectively fitted to engaging protrusions (engaging portions) 54 formed on the side surfaces of the front end portion of the holder 50. . The transparent cover 60 having such a shape is made of nylon having excellent elasticity and oil resistance as described above, and sufficient light transmission is ensured by reducing its thickness.

  By mounting such a transparent cover 60 on the tip of the case 50, the first and second openings 51 and 52 described above are covered with the transparent cover 60. Then, it is alternatively mounted on the first or second sensor holding portion 21 or 22 of the holder 10 described above, and its light receiving surface is desired forward or laterally through the first or second opening portions 51 and 52. The optical sensor 1 is protected by the transparent cover 60. Note that the shape of the transparent cover 60 is firmly maintained unless the pair of leg portions 62 are forcibly expanded against the elastic force. Therefore, the transparent cover 60 attached to the front end portion of the case 50 extends from the front end portion of the case 50 unless the leg portion 62 is intentionally expanded to disengage the engagement protrusion 54 and the fitting hole 63 described above. There is no involuntary dropout. Further, the transparent cover 60 is attached from the outside to the front end portion of the case 50 with the entire outer surface exposed, so that the cleaning is easy and the replacement can be easily performed.

  In addition, the flange body 70 described above is provided with a round hole portion 71 fitted into the outer periphery of the case 50 described above at the center portion thereof as schematically shown in FIGS. 1 and 2, respectively. It has a structure in which a protruding piece 72 projecting sideways is provided with a through hole 73 for screwing. In particular, two engagement grooves (not shown) are provided in parallel on the inner peripheral surface of the round hole portion 71 with a 90 ° shift in the circumferential direction. These engagement grooves selectively engage one engagement protrusion (not shown) provided along the axial direction on the outer peripheral surface of the case 50 described above. The attachment of the flange body 70 to the case 50 can be performed only in a state where the engagement protrusion is fitted in one of the two engagement grooves described above. Accordingly, the flange body 70 is selectively attached to the case 50 in a vertical direction or a horizontal direction by shifting its direction by 90 °.

  While holding the optical sensor 1 and the circuit board 3 as described above, the holder 10 that holds the cable 5 connected to the circuit board 3, the cylindrical case 50 that houses the holder 10, and the optical sensor 1 According to the photodetector configured to include the transparent cover 60 that covers and is attached to the tip of the case 50, it can be assembled very easily. In addition, the holder 10 includes first and second sensor holding portions 21 and 22 that can be mounted on the front end portion 20 with the direction of the optical sensor 1 being different. In addition, it is possible to easily realize two types of photodetectors having different light detection directions by simply mounting the optical sensor 1. Therefore, unlike the prior art, it is not necessary to prepare holders or the like corresponding to the difference in the light detection direction, and the components can be shared.

  The holder 10 has a guide portion 25 for guiding the lead wire 2 of the optical sensor 1 attached to the first or second sensor holding portion 21, 22 toward the soldering portion of the circuit board 3 at the tip portion 20. I have. Therefore, just by inserting the lead wire 2 of the optical sensor 1 from the front surface side of the first sensor holding portion 21 through the through hole 23 and pushing the optical sensor 1 as it is to the position where the first sensor holding portion 21 is fitted, Accordingly, the tip end portion of the lead wire 2 can be positioned at the soldering portion of the circuit board 3. If the lead wire 2 of the optical sensor 1 is inserted from the front side of the second sensor holding part 22 through the through-hole 24 and the optical sensor 1 is pushed into the position where the second sensor holding part 22 is fitted as it is, The lead wire 2 is led out upward. Therefore, the end portion of the lead wire 2 can be positioned at the soldering portion of the circuit board 3 only by bending the lead wire 2 toward the circuit board 3. Therefore, effects such as easy attachment of the optical sensor 1 and connection work of the lead wire 2 to the circuit board 3 can be achieved.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

1 is an external perspective view of a photodetector according to an embodiment of the present invention. FIG. 2 is a perspective view showing a partial cross-section for explaining a schematic configuration of the photodetector shown in FIG. 1. The perspective view which shows the whole structure of a holder. The top view which shows the schematic whole structure of a holder, and the cross-sectional view which shows the state which assembled | attached the circuit board to the holder. The figure which shows the assembly | attachment structure of the circuit board and cable by the rear-end part of a holder. The figure for demonstrating the structure of the front-end | tip part of a case, and the attachment state of a transparent cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical sensor 2 Lead wire 3 Circuit board 5 Cable 10 Holder 21 1st sensor holding part 22 2nd sensor holding part 25 Guide part 50 Case 60 Transparent cover 70 Flange body

Claims (3)

A photodetector in which a light sensor and a circuit board to which the light sensor is connected are incorporated in a rod-shaped holder,
The holder has a first sensor holding portion that holds the photosensor in a direction oriented in the axial direction of the holder at a tip portion thereof, or a second that holds the photosensor in a direction oriented in the lateral direction of the holder. And a lead wire of the optical sensor, which is alternatively attached to the first and second sensor holding portions from the front side thereof, is led to the holding portion of the circuit board. A photodetector comprising a guide portion. A photodetector in which a light sensor and a circuit board to which the light sensor is connected are incorporated in a rod-shaped holder,
The holder has a first sensor holding portion that holds the photosensor in a direction that points in the axial direction of the holder at a tip portion thereof, and a second that holds the photosensor in a direction that points in the lateral direction of the holder. Each of the first and second sensor holding portions, and a guide portion that guides the lead wire of the optical sensor, which is alternatively attached to the first and second sensor holding portions from the front side thereof, to the holding portion of the circuit board. A photodetector comprising:   3. The light detection according to claim 1, wherein the guide portion is provided to face a through hole provided in the first sensor holding portion across a space forming the second sensor holding portion. vessel.

Images