JPH0743685Y2 - Element mounting structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to an element mounting structure in which elements can be mounted to various devices and devices with one touch, and in particular, the position in the rotational direction is arbitrarily set. The present invention relates to a possible element mounting structure.

[Prior Art] For example, in a device such as a photodetector having a light receiving element, it is sometimes desired to attach elements such as an attenuation plate and a glass filter to the incident side of light in order to perform some processing on the input light. .

As shown in FIG. 5, a cylindrical mounting portion 3 is provided at the front end of a case 2 of a photodetector which is conventionally provided with a light receiving element, and a screw portion 4 is formed on the inner surface thereof. It was

The various elements 5 are attached to a ring-shaped holding member 6 having a threaded portion 7 formed on the outer peripheral surface thereof, and the holding member 6 is screwed into the mounting portion 3 of the photodetector, thereby 5 was fixed in front of the light receiving element 1 of the photodetector.

[Problems to be Solved by the Invention] The holding material 6 holding the element is attached to the attachment portion 3 of the photodetector by screwing.

Therefore, the mounting portion 3 of the photodetector must be integrally formed and then internally threaded accurately, and it is not possible to construct it by joining the divided members. could not.

By the way, when the mounting portion 3 of the photodetector or the case 2 of the photodetector including the mounting portion 3 is made of plastic, the design can be set more freely and the manufacturing cost can be increased as compared with the conventional metal one. Can be cheap.

However, according to the plastic molding, since the case 2 of the photodetector and the mounting portion 3 cannot be molded unless they have a divided structure, plastic cannot be selected as a material in the conventional screw-type fixed mounting structure.

Further, when the mounting portion 3 which is the tip portion of the photodetector has a divided structure, the joint may spread and the tip portion may open, especially in a configuration in which the tip portion is not provided with a fitting claw or the like. It was not possible to reliably attach the holding member 6 holding the No. 5 to the attaching portion 3.

Furthermore, according to the conventional mounting structure, since the holding material 6 that holds the element 5 is screwed into the mounting portion 3 and fixed, the holding material 6
The mounting position of the element 5 in the rotational direction of the screw is determined by the depth of the screw portion 7 formed on the outer peripheral surface of the.

Therefore, there is a problem in that it is difficult to keep the mounting position of the element 5 in the rotation direction constant. For example, when a polarization filter is mounted on the photodetector as the element 5, screw-type fixing does not There is a disadvantage that the polarization direction cannot be accurately set at an arbitrary position with respect to the photodetector.

[Purpose of the device] The mounting part on the device body side has a divided structure, the shape can be freely selected for design, and it can be manufactured cheaply by plastic molding, and the separation due to the spread of the mounting part tip is suppressed, It is an object of the present invention to provide an element mounting structure in which an element mounting position can be set arbitrarily and accurately so that the element can be attached to and detached from the device body with one touch.

[Construction of the Invention] The element mounting structure of the present invention has a mounting hole for a divided device body.
An annular protrusion 15 formed in a single layer (or a double layer) around the periphery of 22 and a locking piece 26 projecting around the periphery of the annular protrusion 15 are attached double (or single layer) so as to sandwich the protrusions. ) Has an annular guide portion 25, 27, and the element 1 is provided substantially at the center of the annular portion of the guide portion.
2 includes a mounting plate 21 fixedly held, and a cutout portion 23 formed in a part of the peripheral edge of the mounting hole so that the locking piece can pass, and the locking piece passes through the cutout portion. Then, while engaging the guide portion with the protrusion, the mounting plate is rotated to lock the locking piece on one side of the peripheral edge of the mounting hole, and the mounting plate is mounted in the mounting hole. Thus, the device is configured to be attached to the device main body so as to be coaxial.

[Operation] Insert the inner guide part of the mounting plate holding the element into the mounting hole of the device body, engage the outer guide part with the protrusion of the main body, and move the locking piece from the notch into the mounting hole. Then, the mounting plate is rotated to lock the locking piece on the lower surface side of the peripheral portion of the mounting hole. As a result, the element is attached to the device body via the attachment plate.

At this time, the position of the mounting plate in the rotational direction with respect to the mounting hole can be set arbitrarily.

Further, when the mounting plate is attached to the divided device body, the guide portions of the mounting plate engage with each other so as to sandwich the projecting portions of the device body, and at least two of the peripheral surfaces with respect to the direction perpendicular to the optical axis are attached. Since the surfaces are in contact with each other and are reinforced, the divided portions of the device body can be prevented from expanding and separating.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an element mounting structure of an embodiment, FIG.
FIGS. (A), (b) and (c) are a front view, a right side view and a rear view, respectively, of a mounting plate 21 for holding the element 12, and FIG. 3 is provided with a mounting hole 22 for mounting the element 12. Partially cutaway view of the device body, FIGS. 4 (a) and 4 (b) are respectively the first view.
FIG. 3 is a cross-sectional view taken along cutting planes a and b shown in the figure.

This embodiment is an example in which an element 12 such as an attenuating plate is attached to the light incident side of a photodetector 10 having a light receiving element. 1 and 3
As partially shown in the figure, the case 11 of the photodetector 10 has a substantially box shape in which a cylindrical mounting portion 13 is provided at the front end portion on the light incident side. The case 11 is formed by injection molding of plastics and has a structure in which two vertically divided parts are joined together, and a light receiving element 14 is provided on the bottom of the mounting portion 13.

A circular hole is provided at the center of the front end surface of the mounting portion 13. A protrusion 15 having a predetermined height is formed around the hole, but at a pair of positions symmetrical with respect to the center of the hole, the protrusion 15 is interrupted by a predetermined length, and a concave step portion 16 is formed.
It is said that. Further, on the outer peripheral portion of the front end surface of the mounting portion 13, a ring-shaped projecting edge portion 17 higher than the ring-shaped projecting portion 15 is provided.
Are continuously provided, and the protruding edge portion 17 and the protruding portion are
A peripheral groove 18 having a predetermined width is provided between the peripheral groove 18 and the groove 15.

As shown in FIGS. 3 and 4, a metal diode case 19 having a shape substantially following the inner surface shape of the mounting portion 13 is inserted inside the mounting portion 13. Although not shown in detail, the light receiving element 14 is provided in the diode case 19
And is fixed in the case 11. An attachment hole 22 of an attachment plate 21 described later is defined by an annular flange 20 at the center of the upper end surface of the diode case 19. The flange 20 has an upper surface at substantially the same height as the bottom surface of the circumferential groove 18, and is located at 90 ° from the both concave step portions 16, 16 with respect to the center of the mounting hole 22. , Notches 23, 23 are formed, respectively.

Next, the mounting plate 21 mounted on the mounting portion 13 will be described. As shown in FIGS. 1 and 2, the mounting plate 21 has a disk shape, and a circular hole 24 in which a step portion 24a for mounting the element 12 is formed is provided in the central portion thereof. On the back side of the mounting plate 21, an annular inner guide portion 25 through which the circular hole 24 is provided is projected, and the flange 20 is provided at a symmetrical position on the outer peripheral surface of the guide portion 25. Resilient locking pieces 26, 26 having a size and shape slightly smaller than the notches 23, 23 are provided so as to project in the radial direction of the circular hole 24. Also, the mounting plate
An outer guide portion 27, which has an annular shape and matches the circumferential groove 18, is formed on the peripheral edge portion of the flat surface 21. The guide portion 27 is interrupted at two locations near the locking pieces 26, 26, and the recessed step portion is provided on the rear surface of the mounting plate 21 at this position.
Locking protrusions 28, 28 for locking 16 and 16 are provided, respectively.

Next, a procedure for attaching the element 12 to the photodetector 10 with the structure as described above will be described.

First, the element 12 is fixed to the step portion 24a of the circular hole 24 of the mounting plate 21. Next, as shown in FIG. 1, the locking pieces 26, 26 are notched 2
The positions are adjusted so as to enter the insides of 3, 23, and the inner guide portion 25 is inserted into the mounting hole 22 to mount the mounting plate 21 on the mounting portion 13.

At this time, the guide portion 27 on the outer side of the mounting plate 21 is engaged with the circumferential groove 18 of the mounting portion 13, and both the guide portions 25 and 27 are at positions sandwiching the protruding portion 15, but the locking protrusion 28 Since 28 and 28 hit the protrusions 15, the mounting plate 21 is slightly raised with respect to the mounting portion 13. When the mounting plate 21 is rotated from this state, the locking pieces 26, 26 cause the flange 2 forming the peripheral portion of the mounting hole 22.
Since it enters the lower side of 0, the mounting plate 21 cannot be removed from the mounting hole 22.

Then, when rotated by 90 °, both locking protrusions 28, 28 engage with the both concave step portions 16, 16, so that the position of the mounting plate 21 in the rotational direction is securely fixed at that position. Also, the mounting plate 21 is 2
The heavy annular guide portions 25 and 27 securely engage the attachment hole 22 provided in the attachment portion 13 and the annular projection 15 with each other.

Therefore, the mounting plate 21 will not be displaced from the center of the mounting hole 22 by the elastic force, and the mounting plate 21 will not be displaced with respect to the light receiving element 14.
12 can be set to the exact position. Furthermore, if a force is applied to the mounting portion 13 in the direction of dividing it, the mounting plate 21
Will serve as a stiffener to prevent splitting.

Incidentally, the concave step portions 16, 1 with respect to the light receiving element 14 of the photodetector 10.
By changing the positional relationship of 6, the position of the mounting side element 12 with respect to the light receiving element 14 in the rotational direction can be arbitrarily set.

Further, in the embodiment, in order to more securely fix the position of the mounting plate 21 in the rotation direction, the locking projections 28, 28 and the recessed step portions 16, 16 are provided, but even if such a structure is not provided, the mounting The position of the mounting plate 21 in the rotational direction can be arbitrarily set only by the guide portions 25, 27 inserted into the hole 22 and the locking pieces 26, 26 engaged with the peripheral portions of the mounting hole 22.

Further, since the guide portion 27 is engaged with the circumferential groove 18, it also has an effect of suppressing the opening of the mounting portion 13 divided into two.
Further, in this embodiment, the diode case 19 is separated from the mounting portion 13, and both are combined to mount the mounting hole 22 inside the flange 20.
However, both may be formed integrally. Further, the protrusion 15 may be provided along the periphery of the mounting hole 20 without providing the flange 20.

[Advantages of the Invention] As described above, in the element mounting structure according to the present invention, the double (or single) annular guide portion of the mounting plate to which the element is fixed is used as the mounting hole provided in the device body. Single (or 2
The locking piece of the mounting plate is passed through the notch into the mounting hole while it is engaged with the ring-shaped projection, and the mounting plate is turned to an arbitrary position to attach the locking piece to the mounting hole. The element is attached to the main body of the device via the attachment plate by being locked to one side of the peripheral edge of the element.

Therefore, according to the present invention, when the mounting plate is attached to the divided device body, the guide portions of the mounting plate engage with each other so as to sandwich the projections of the device body in a direction perpendicular to the optical axis. Since at least two surfaces of the peripheral surface are in contact with each other for reinforcement, it is possible to prevent the divided portion (tip of the mounting portion) of the device body from expanding and separating.

Further, since the device body side is a divided structure, unlike the case of the conventional screw-in type mounting structure, the shape can be freely selected in terms of design, and furthermore, it can be manufactured at low cost by plastic molding.

Furthermore, the locking piece that has passed through the notch and fits inside the mounting hole is locked to one side of the peripheral edge of the mounting hole by turning the mounting plate to an arbitrary position. Can be set arbitrarily and accurately, and the element can be attached / detached to / from the device body with one touch.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a mounting structure of an embodiment, and FIGS. 2 (a) to 2 (c) are front views, right side views, and rear views of a mounting plate holding an element, respectively. Is a partially cutaway perspective view of a device body provided with a mounting hole for mounting an element,
4 (a) and 4 (b) are sectional views shown in FIG. 1, respectively.
FIG. 5 is a sectional view of a and b, and FIG. 5 is a sectional view showing an example of a conventional screw-in type element mounting structure. 12 ... Element, 15 ... Projection, 21 ... Mounting plate, 22 ... Mounting hole, 23 ... Notch, 25 ... Inner guide, 26 ... Locking piece, 27 ... Outer guide Department.

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped projection (15) formed in a single layer (or double layer) around the mounting hole (22) of the divided device body.
And a locking piece (26) around which a double (or single) annular guide part (25, 27) is attached so as to sandwich the projection, and the guide part is provided. A mounting plate (21) having an element (12) fixedly held in the substantially central portion of the ring, and a notch (23) formed in a part of the peripheral edge of the mounting hole so that the locking piece can pass therethrough. ), The locking piece is passed through the cutout portion, the guide portion is engaged with the protruding portion, and the mounting plate is rotated to move the locking piece to one side of a peripheral portion of the mounting hole. The device mounting structure is characterized in that the device is configured to be mounted on the device main body so as to be aligned with the device body by locking the device to the device mounting hole.