JP4081757B2 - Attachment mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attachment mounting structure suitable for mounting a filter attachment such as an optical filter on a sensing window in a sensing device such as an optical edge sensor.
[0002]
[Related background]
A sensing device 1 such as an optical edge sensor normally incorporates a sensing device body (not shown) having a projector and / or a light receiver in a thin box-shaped housing 2 as shown in FIG. The box-shaped housing 2 has a structure in which a sensing window 3 that transmits light is formed at a narrow side end. And it is comprised so that the predetermined light emitted from the said sensing apparatus main body may be projected to an external sensing area | region via the said sensing window 3, or the light which passed through the sensing area | region is received via the said sensing window 3. . In the figure, reference numeral 4 denotes a connection cable including a signal line, a power line, and the like from the sensing device main body that is led out from the rear end portion of the box-shaped housing 2 and connected to an external device (not shown).
[0003]
When an optical filter is attached to cover the sensing window 3 of such a sensing device 1, a filter attachment 6 incorporating the optical filter 5 is prepared exclusively, and the filter attachment 6 is attached to the box-shaped housing 2. I have to. Incidentally, the filter attachment 6 has a structure in which the optical filter 5 is attached by caulking or the like to the center of a U-shaped frame 7 fitted into the narrow side portion of the box-shaped housing 2. The box-shaped housing 2 is mounted by fitting a projection 9 projecting from the box-shaped housing 2 into an engagement hole 8 provided in a side edge portion. In addition, about the attachment structure of components by such engagement (fitting) with the engagement hole 8 and the protrusion 9, it is known as an attachment structure of the front panel with respect to a box-shaped housing | casing (for example, patent document 1). reference).
[0004]
[Patent Document 1]
JP-A-9-116281 [0005]
[Problems to be solved by the invention]
However, when the filter attachment 6 having such a structure is attached to the sensing device 1, the substantial thickness D of the sensing device 1 is thicker than the thickness d of the box-shaped housing 2 as shown in the plan view of FIG. I can't deny it. That is, the substantial thickness D as the sensing device 1 is increased by the amount corresponding to twice the height of the protrusion 9 provided on the box-shaped housing 2 or the thickness of the frame body 7. Such an increase in thickness is unfavorable for this type of sensing device 1 in which great restrictions are imposed on the thickness dimension.
[0006]
Therefore, as shown in FIG. 7, it can be considered that the filter attachment 6 is screwed and fixed to the side of the box-shaped housing 2 having relatively loose constraints on the dimensions, on the side where the above-described sensing window 3 is provided. However, in order to screw the filter attachment 6 to the box-shaped casing 2, the box-shaped casing 2 needs to be provided with a screw hole 2a in advance. However, it is difficult to secure a place where the screw hole 2a is provided because the overall shape is made compact while ensuring the optical space inside. In particular, the sensing window 3 is provided as close as possible to the distal end side of the side portion of the box-shaped housing 2, so it was difficult to provide the screw hole 2 a at the distal end of the box-shaped housing 2.
[0007]
The present invention has been made in view of such circumstances, and its object is to easily and firmly filter the side of the box-shaped housing 2 without causing a substantial increase in the thickness of the sensing device. An object of the present invention is to provide an attachment mounting structure to which an attachment can be attached.
[0008]
[Means for Solving the Problems]
The attachment mounting structure according to the present invention to achieve the above-described object is a structure suitable for mounting a filter attachment covering the sensing window to a sensing device provided with a sensing window on a side part,
A predetermined filter component is attached to the center of the filter attachment, and one end of a spring plate extended to both sides of the filter component is bent, and the bent portion is elastically biased toward the outside. Suppose that it was formed as a nail part,
On the other hand, the sensing device is provided with an engagement groove that engages with the claw portion of the filter attachment in the vicinity of the side portion of the sensing window, and on the opposite side of the engagement groove with the sensing window interposed therebetween. A screw hole for screwing the other end of the filter attachment is provided.
[0009]
Preferably, the sensing device forms a sensing window that transmits light at a narrow side end of a thin box-shaped casing, and projects sensing light to the box-shaped casing through the sensing window. The filter component is an optical filter, and the spring plate on which the optical filter is mounted is connected to the end opposite to the engaging claw in the box. It is configured such that it extends along the tip of the mold casing and a screw hole or groove is formed at the tip.
[0010]
With such a structure, the claw portion formed by bending one end of the spring body in the filter attachment is fitted into the engagement groove of the sensing device, and is engaged with the engagement groove by the elastic biasing force of the claw portion. In this state, the filter attachment can be firmly attached to the sensing device simply by screwing the other end of the spring body to the sensing device. Moreover, since the filter attachment is only provided along the side portion of the sensing device, it can be mounted without protruding in the thickness direction of the sensing device.
[0011]
In the attachment mounting structure according to the present invention, the filter attachment is mounted with a predetermined filter component at the center thereof, and both end portions of the spring plate extending on both sides of the filter component are bent, respectively. It is assumed that the bent portions are formed as first and second claw portions that are elastically biased toward the outside, respectively, while the sensing device has each claw portion of the filter attachment near both sides of the sensing window. A feature is that first and second engaging grooves are provided to engage with each other.
[0012]
Even with such a structure, the filter attachment can be easily and firmly attached to the sensing device. And since it is provided only along the side part of a filter attachment sensing apparatus, it does not protrude in the thickness direction of this sensing apparatus, and its mounting | wearing can be performed easily.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an attachment mounting structure according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a relationship between the sensing device 1 and the filter attachment 11, and FIG. 2 is a partial sectional view showing a mounting structure of the filter attachment 11 to the sensing device 1. Here, as the sensing device 1, light emitted from a projector 21 such as a light emitting diode is reflected in a substantially right angle direction using a reflecting mirror 22, and this light is reflected through the lens 23 on the side of the box-shaped housing 2. A light projection unit that projects light from the sensing window 3 provided in the section will be described as an example. However, it goes without saying that a light receiving unit that guides light received through the sensing window 3 from the lens 23 to the light receiver 25 through the reflecting mirror 22 may be used. A sensing device that forms a light projecting system and a light receiving system on the same optical path and inputs and outputs light through the sensing window 3 may be used.
[0014]
That is, the sensing device 1 includes a sensing device body including a projector 21 and a light receiver 25 in a thin box-shaped housing 1, and in particular, an optical path from the light projector 21 or the light receiver 25 to the sensing window 3. In order to set the length longer, a reflecting mirror 22 is provided on the front end side of the box-shaped housing 1, and an optical path is formed by bending the optical axis of the reflecting mirror 22 at a substantially right angle. And by providing the lens 23 between the reflecting mirror 22 and the sensing window 3, the light inputted / outputted through the sensing window 3 is made into parallel light of a predetermined width. In particular, the sensing window 3 is positioned at the front end of the box-shaped housing 1 by providing the reflecting mirror 22 on the front-end portion side of the box-shaped housing 1, thereby reducing the overall shape.
[0015]
A filter attachment 30 according to the present invention, which is attached to the sensing device 1 having such a structure so as to cover the sensing window 3, has a plate-like optical filter 5 having a thickness of about 1 to 3 mm as shown in FIG. It is comprised mainly by the spring plate 31 attached to. The spring plate 31 is made of phosphor bronze or stainless steel having a thickness of 0.1 to 0.5 mm, and has a rectangular hole 32 into which the optical filter 5 is fitted at the center of the plate surface. The optical filter 5 is fitted into the hole 32 and is integrated with the spring plate 31 by adhering or caulking its peripheral portion.
[0016]
The spring plate 31 has mounting pieces 33 and 34 extending on both sides of the optical filter 5 in the longitudinal direction. One mounting piece 33 is bent along the tip of the sensing device 1, and a screw hole 35 having a predetermined diameter is provided at the tip. The other mounting piece portion 34 is bent at an angle of approximately 60 ° in the same direction as the mounting piece portion 33, and its tip portion is bent in the opposite direction to form a claw portion 36. . The claw portion 36 is elastically biased outward by an elastic force at the bent portion of the mounting piece portion 34. The number of the claw portions 36 may be one, or a plurality of the claw portions 36 may be formed side by side as will be described later.
[0017]
On the other hand, the box-shaped housing 2 of the sensing device 1 is formed with an engaging groove 41 that is located on the side of the sensing window 3 and engages with the claw portion 36 of the filter attachment 30. A screw hole 42 is formed at a position facing the screw fixing hole 34 at the tip of the body 2. The engaging groove 41 has a structure in which the bottom portion is greatly expanded and a step is formed on the wall surface, and the tip end portion of the claw portion 36 is latched and locked to the step portion. Incidentally, the engaging groove 41 is a wall thickness that separates a portion of the box-shaped housing 2 that houses the above-described lens 23 and a portion that houses an electric circuit board (not shown) on the rear end side of the box-shaped housing 2. Provided in the part. The screw hole 42 is provided using a dead space on the back side of the reflecting mirror 22 described above in the box-shaped housing 2. As a result, the engagement groove 41 and the screw hole 42 for attaching the filter attachment 30 are provided without changing the arrangement of the optical system or the like in the box-shaped housing 2.
[0018]
As shown in FIG. 2, the attachment of the filter attachment 30 to the box-shaped housing 2 of the sensing device 1 is performed by inserting the claw portion 36 into the engaging groove 41 and the mounting piece 33 of the spring plate 31 as the box-shaped housing. The screw 43 is screwed into the screw hole 42 through the screw fixing hole 34 positioned at the tip end portion of the screw 2. As a result, the optical filter 5 supported by the spring plate 31 is positioned on the upper surface of the sensing window 3. The claw portion 36 is lifted upward with the opening edge of the engagement groove 41 as a fulcrum, and engages with a step formed on the wall surface of the engagement groove 41 from below as shown in FIG. Then, it is pressed against the step portion with a predetermined elastic force. As a result, the filter attachment 30 is mounted so as to cover the sensing window 3 of the sensing device 1 so as to be hung from the side portion of the box-shaped housing 2 to the tip portion, and the claw portion 36 and the engagement groove (step portion) 41 described above. And the screw 43 screwed into the screw hole 42 is firmly fixed.
[0019]
The filter attachment 30 is detached from the sensing device 1 by removing the screw 43 described above and lifting the mounting piece 33 of the spring plate 31 as shown by the phantom line in FIG. Should be pulled out. Alternatively, as shown in FIG. 3B, a pressing bar 45 is inserted into the locking groove 41 to bend the mounting piece 34, thereby engaging the claw portion 36 and the engagement groove (stepped portion) 41. It is also possible to release the claw portion 36 from the engaging groove 41.
[0020]
Thus, according to the attachment structure described above, the claw portion 36 formed on one mounting piece portion 34 of the spring plate 31 is engaged with the step portion of the engaging groove 41, and the other mounting piece portion 33 is connected to the box-shaped housing. Since the structure is screwed to the tip of the body 2, the filter attachment 30 can be attached to the sensing device 1 easily and firmly. In particular, since the claw portion 36 is elastically biased and engaged with the step portion of the engagement groove 41, it can be stably mounted without so-called rattling.
[0021]
In the above-described structure, only the spring plate 31 extending from the side surface of the box-shaped housing 2 to the front end surface of the sensing device 1 is provided. Since it does not protrude in the width direction, the substantial thickness of the sensing device 1 does not increase. In addition, since the engaging groove 41 and the screw groove 42 are each formed using the dead space of the box-shaped casing 2 as described above, there is an effect that the box-shaped casing 2 does not need to be enlarged. .
[0022]
The present invention is not limited to the embodiment described above. For example, in the embodiment described above, one mounting piece portion 33 of the spring plate 31 is screwed. However, as shown in FIG. 4, a claw portion 37 is also formed at the tip of the mounting piece portion 33. Alternatively, it may be engaged with an engagement groove 45 formed at the tip of the box-shaped housing 2. That is, claw portions 36 and 37 that are elastically biased are formed at both ends of the spring plate 31, and the claw portions 36 and 37 are engaged with the engagement grooves 41 and 45, respectively, and the filter attachment 30 is mounted. You may do it.
[0023]
The width of the spring plate 31 is sufficient if it is slightly narrower than the thickness d of the box-shaped housing 2, and the thickness is sufficient if a predetermined elastic force can be secured. Further, here, an example in which the optical filter 5 is attached to the optical sensing device 1 has been described. However, when the sensing device 1 is a flow sensor or the like, a case where a dust-free mesh filter is attached to the sensing portion is also described. The same can be applied. The number of the claw portions 36 and 37 may be one, but a plurality of claw portions 36 and 37 may be provided side by side, and the engagement grooves 41 and 45 may be provided corresponding to these claw portions. Specifically, two claw portions 36 are provided along the edge portion of the mounting piece portion 33, and the locking grooves 41 into which the claw portions 36 are respectively fitted are provided at the end portions in the width direction at the side portions of the box-shaped housing 2. You may make it provide in each. In this way, it is possible to reliably prevent the lateral displacement (the displacement in the thickness direction of the box-shaped housing 2) of the mounting piece portion 33 in which the respective claw portions 41 are engaged with the respective locking grooves 41. Can be more reliably prevented. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.
[0024]
【The invention's effect】
As described above, according to the present invention, the filter attachment can be easily and stably attached without covering the sensing window of the sensing device without causing a substantial increase in the thickness of the sensing device. it can. In addition, there is an advantage that the filter attachment can be easily attached by effectively utilizing the dead space of the box-shaped housing in the sensing device.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a relationship between a sensing device and a filter attachment for explaining an attachment mounting structure according to an embodiment of the present invention.
FIG. 2 is a view showing a state in which a filter attachment is attached to the sensing device shown in FIG.
3 is a diagram showing an engagement relationship between a claw portion of the filter attachment shown in FIG. 1 and an engagement groove provided in a sensing device. FIG.
FIG. 4 is a view showing an attachment state of a filter attachment to a sensing device for explaining an attachment attachment structure according to another embodiment of the present invention.
FIG. 5 is a perspective view showing a relationship between a conventional general filter attachment and a sensing device.
6 is a view showing a state in which a filter attachment is attached to the sensing device shown in FIG. 5. FIG.
FIG. 7 is a diagram illustrating another attachment state of the filter attachment to the sensing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensing apparatus 2 Box-shaped housing 3 Sensing window 5 Optical filter 31 Spring plate 33, 34 Mounting piece part 35 Screw fixing hole 36, 37 Claw part 41, 45 Engaging groove 42 Screw hole

Claims (3)

A sensing device provided with a sensing window on the side, and a filter attachment that covers the sensing window and is attached to the sensing device;
The filter attachment includes a filter component, a spring plate mounted on the filter component at a central portion and extending on both sides of the filter component, and one end portion of the spring plate is bent to be directed outward. An elastically biased nail portion,
The sensing device is provided in the vicinity of a side portion of the sensing window and engages with a claw portion of the filter attachment, and is provided on a side opposite to the engagement groove with the sensing window interposed therebetween. An attachment mounting structure comprising a screw hole for screwing the other end of the filter attachment. The sensing device forms a sensing window that transmits light at a narrow side end of a thin box-shaped housing, and projects sensing light to the box-shaped housing through the sensing window and / or It consists of a built-in optical sensing device that receives light,
The filter component is an optical filter, and the spring plate on which the optical filter is mounted has its end opposite to the engaging claw extending along the front end of the box-shaped housing, and its front end. The attachment mounting structure according to claim 1, comprising a screw hole or groove formed in the portion. A sensing device provided with a sensing window on the side, and a filter attachment that covers the sensing window and is attached to the sensing device;
The filter attachment is formed by bending a filter part, a spring plate mounted on the filter part at the center and extending on both sides of the filter part, and bending both ends of the spring part. And first and second claws that are elastically biased
An attachment mounting structure according to claim 1, wherein the sensing device includes first and second engagement grooves that are provided in the vicinity of both side portions of the sensing window and engage with the claw portions of the filter attachment.

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