JP2008128341A - Snap fit mechanism and blade driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a snap fit mechanism maintaining assembling property without being influenced by burrs, and a blade driving device using the snap fit mechanism. <P>SOLUTION: The snap fit mechanism comprises a first engaging part 75 having a claw part 75a, and a second engaging part 24 having a collar part 24a engaged with the claw part 75a. The first engaging part 75 has a projecting part 75c abutting on the second engaging part 24 in the engaged state of the first engaging part 24 and second engaging part 75. The projecting part 75c is formed at a face where a burr 75z may be formed, of the first engaging part 75, and formed to be higher than the projecting height from the face of the burr 75z that may be formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a snap fit mechanism and a blade driving device.

A blade driving device used for a camera or the like includes a substrate having an opening through which subject light passes, and a blade pressing plate that holds a blade that opens and closes the opening between the substrate and the substrate and the blade pressing plate are snapped. Some are assembled with each other by a fitting mechanism (see Patent Document 1).
Such a snap-fit mechanism is assembled to each other by engaging a first engagement portion having a claw portion with a second engagement portion having a claw engagement portion that engages with the claw portion.

JP 2005-250297 A

By the way, the assemblability of the snap fit mechanism depends on the molding accuracy of the resin forming the snap fit mechanism.
Accordingly, when burrs are generated when the snap-fit mechanism is formed, the assemblability may be lowered depending on the location where the burrs are generated. When assembly performance is reduced, for example, burrs may be peeled off during assembly, resulting in waste, causing product quality degradation, or when assembly itself is difficult, cannot be shipped as a product. Therefore, the product cost may increase. Moreover, it becomes difficult to assemble in a short time, and the productivity is lowered. In this case, the product cost may increase.
Even when such a snap-fit mechanism with reduced assembly accuracy is used for the blade drive device substrate and blade retainer plate, the assembly performance is reduced due to the generation of burrs, or the burrs are peeled off and become dusty. This may reduce the driving accuracy of the blades.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a snap-fit mechanism that maintains assemblability without being affected by burrs, and a blade driving device using the snap-fit mechanism.

The object includes a first engagement portion having a claw portion and a second engagement portion having a claw locking portion that can be engaged with the claw portion, wherein the first engagement portion is the second engagement portion. A protrusion that contacts the second engagement portion in a state of being engaged with the joint portion, and the protrusion is formed on a surface on which the burr of the first engagement portion may occur and This can be achieved by a snap-fit mechanism characterized in that the burr obtained is formed to be higher than the protruding height from the surface.
With this configuration, the protrusion is formed on the surface where the first engaging portion abuts against the second engaging portion in a state where the first and second engaging portions are engaged, and a burr of the first engaging portion is generated. Since the burr is formed to be higher than the protruding height of the burr from the surface, the protrusion is formed higher than the burr even when the burr occurs. In the engagement, there is no influence of burrs. Therefore, the assembling property can be maintained without being affected by burrs. In addition, since it can be easily assembled even if burrs are generated, it is possible to suppress the generation of defective products due to burrs and to suppress an increase in product cost.

Moreover, the said structure can employ | adopt the structure which has the inclined surface which makes the said protrusion part easy engagement with a said 2nd engaging part.
With this configuration, the assembling property can be further improved. Productivity is improved because assembly is improved.

Further, in the above configuration, the substrate and the blade include the substrate having the opening, the blade that opens and closes the opening, the blade receiving plate that holds the blade between the substrate, and the snap-fit mechanism. A structure that is assembled by the snap-fit mechanism described above can be adopted as the backing plate.
With this configuration, it is possible to provide a blade driving device that maintains assembly without being affected by burrs, and that does not fear that the burrs are peeled off and become dust, thereby reducing the driving accuracy of the blades.

  ADVANTAGE OF THE INVENTION According to this invention, the snap fit mechanism by which the assembly | attachment property was maintained, without receiving the influence of a burr | flash, and the blade | wing drive device using the same can be provided.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of the blade driving device.
The camera blade drive device 1 includes an actuator unit 10, a shutter substrate 20, a first blade receiving plate 30, a first blade 40, a second blade 50, a second blade receiving plate 60, and a blade presser plate 70 in this order from the subject side. Composed.

  The blade driving device 1 is a device having two blades. The actuator unit 10 is a drive source for the first blade 40 and the second blade 50. The output pin 11 is connected to an output shaft (not shown) of the actuator unit 10 and transmits the driving force of the actuator unit 10 to the first blade 40 and the second blade 50. Further, the shutter substrate 20 is formed with an escape hole 22 for releasing the swing of the output pin 11 within a predetermined range.

  The shutter substrate 20 has an opening 21 at its center for guiding subject light to an image sensor (not shown). Further, two columnar members 23 are provided on the surface of the shutter substrate 20 on the subject side, and the columnar members 23 are mounting columns used when assembled to a camera body (not shown). In addition, the outer periphery of the shutter substrate 20 is formed with three second engaging portions 24 that are formed in a concave shape. Details of the second engaging portion 24 will be described later.

  The first blade receiving plate 30 is disposed adjacent to the image sensor side of the shutter substrate 20. An opening 31 is formed at the center of the first blade receiving plate 30 so as to correspond to the opening 21. A notch 32 is formed at the end of the first blade receiving plate 30 so as to release the swing of the output pin 11.

The first blade 40 has a long hole 41 that engages with the output pin 11. The shaft hole 42 is inserted in common with the shaft hole 74 of the blade pressing plate 70 by a shaft portion (not shown) formed on the image pickup element side of the shutter substrate 20. The first blade 40 swings within a predetermined range with the shaft hole 74 as a fulcrum.
The second blade 50 is formed with a long hole 51 that engages with the output pin 11. The shaft hole 52 is also inserted in common with the shaft hole 73 of the blade pressing plate 70 by a shaft portion (not shown) formed on the imaging element side of the shutter substrate 20. The second blade 50 swings within a predetermined range with the shaft hole 73 as a fulcrum.

The second blade receiving plate 60 has an opening 61 at the center thereof so as to correspond to the opening 21 and the opening 31. A notch 62 is also formed at the end of the second blade receiving plate 60 so as to allow the output pin 11 to swing.
The blade pressing plate 70 has an opening 71 formed at the center thereof so as to correspond to the opening 21, the opening 31, and the opening 61. Further, an arc hole 72 for releasing the swing of the output pin 11 is formed. A first engaging portion 75 is formed on the outer peripheral portion of the blade pressing plate 70, and is formed at three locations corresponding to the second engaging portion 24. Further, the blade pressing plate 70 is made of resin.

  In order to assemble the blade driving device 1, first, the output pin 11 is assembled to the output shaft of the actuator unit 10 via the shutter substrate 20, and a plurality of fixing pins formed to protrude from the surface of the shutter substrate 20 on the image sensor side. The first blade receiving plate 30 is engaged with the pin (not shown), and then the elongated hole 41 and the shaft hole 42 of the first blade 40 are respectively imaged of the output pin 11 and the shutter substrate 20. The shaft 51 (not shown) formed on the element side is engaged, and the long hole 51 and the shaft hole 52 of the second blade 50 are respectively formed on the image pickup element side of the output pin 11 and the shutter substrate 20. The first blade 40 and the second blade 50 are assembled by engaging with a shaft portion (not shown). Next, the plurality of pins formed on the surface on the image pickup element side of the shutter substrate 20 and the surface on the subject side of the blade pressing plate 70 described above are respectively engaged with the corresponding holes provided in each member. Then, the second blade receiving plate 60 and the blade holding plate 70 are assembled. When the blade pressing plate 70 is assembled to the shutter substrate 20, the first engaging portion 75 and the second engaging portion 24 are engaged to restrict the positions in the optical axis direction. Further, the first blade receiving plate 30, the first blade 40, the second blade 50, and the second blade receiving plate 60 are held between the shutter substrate 20 and the blade pressing plate 70.

Next, the first engaging portion 75 will be described in detail.
2 to 4 are explanatory views of the first engaging portion 75, FIG. 2 is a perspective view of the first engaging portion 75, FIG. 3 is a front view, and FIG. 4 is a plan view.
The first engaging portion 75 is formed to project from the outer periphery of the blade pressing plate 70 in a rectangular parallelepiped shape in a direction (optical axis direction) orthogonal to the blade pressing plate fixing surface 70a. The first engaging portion 75 includes a claw portion 75a, a body portion 75b, a projection portion 75c, and the like, and the body portion 75b can be elastically deformed in the thickness direction.
The claw portion 75a is formed so as to protrude from the distal end portion of the body portion 75b toward the center side of the blade pressing plate 70.
In addition, an inclined surface 75e is formed at the upper end of the claw portion 75a so as to be inclined from a part thereof to the tip on the center side.

  On the surface of the body portion 75b in which the perpendicular to the surface is perpendicular to the optical axis direction, more specifically, on the side surface portion 75f formed substantially perpendicular to the outer peripheral direction of the blade presser plate 70, 75c is formed. The projecting portion 75c is formed in a semi-cylindrical shape along the side surface portion 75f, and is formed so that the curved surface faces outward. Further, the protrusion 75c is formed to have a height up to a position lower than the position where the claw 75a protrudes. In addition, an inclined portion 75d inclined in a conical shape is formed at the tip of the protrusion 75c on the subject side.

  Further, a hole 70 b is formed in the vicinity of the first engaging portion 75 in the blade pressing plate 70. The hole 70b is formed when a mold for forming the claw 75a is removed. The body part 75b is formed so as to protrude in the optical axis direction along the inner edge part of the blade pressing plate hole part 70b.

Next, burrs that may occur in the first engagement portion 75 will be described.
5 is a cross-sectional view taken along the line AA in FIG.

  The protruding height of the protruding portion 75c from the side surface portion 75f is L1. Similarly, the protrusion height of the burr 75z from the side surface portion 75f is L2. As shown in FIG. 5, the protrusion height L1 of the protrusion 75c is formed to be higher than the protrusion height L2 of the burr 75z. The burr 75z is formed by the resin entering the gap between the mold for forming the blade pressing plate 70 and the mold for forming the claw portion 75a. . Accordingly, the protrusion 75c is formed on the surface where the burr 75z is formed (the surface where a gap between the molds may be generated).

Next, the second engagement portion 24 that engages with the first engagement portion 75 will be described.
FIG. 6 is a plan view of the second engaging portion 24. 7 is a cross-sectional view taken along line BB in FIG.
The second engaging portion 24 is formed in a cutout shape so as to be concave on the outer peripheral edge of the shutter substrate 20.
Further, the second engagement portion 24 includes a flange portion 24a, a side surface portion 24b, and the like.
An inclined surface 24c that is inclined toward the center side is formed on the imaging element side of the flange 24a. Further, in the engaged state of the first engaging portion 75 and the second engaging portion 24, the flange portion 24a engages with the claw portion 75a as a claw locking portion, and the side surface portion 24b has a certain amount of clearance with the protruding portion 75c. Engage.

Next, the engagement state of the second engagement portion 24 and the first engagement portion 75 will be described.
FIG. 8 is a plan view of the second engagement portion 24 and the first engagement portion 75 in the engaged state. 9 is a cross-sectional view taken along the line CC of FIG.

  The claw portion 75a is engaged with the flange portion 24a, and the second engagement portion 24 and the first engagement portion 75 are in the engaged state. When the first engagement portion 75 is assembled to the second engagement portion 24, the first engagement portion 75 is pushed into the second engagement portion 24 from the lower side to the upper side in FIG. The body part 75b is elastically deformed in the left direction of FIG. When the second engagement portion 24 is further pushed upward from this state, the contact state between the inclined surface 75e and the flange portion 24a is released, and the flange portion 24a is disposed below the claw portion 75a. And the 1st engaging part 75 will be in an engagement state.

  In this way, the inclined surfaces 75e and 24c are formed so as to promote elastic deformation in the thickness direction of the first engaging portion 75 that is necessary when engaging.

  Further, as described above, since the inclined portion 75d is formed in the protruding portion 75c, the protruding portion 75c comes into contact with the side surface portion 24b when the first engaging portion 75 is assembled to the second engaging portion 24. However, the first engaging portion 75 can be smoothly incorporated by the inclined portion 75d. Further, when the first engagement portion 75 is pushed into the second engagement portion 24, the side surface portion 24 b has a certain amount of clearance on the side surface of the projection portion 75 c, and the first engagement portion 75 and the second engagement portion 24. So that the second engagement portion 24 and the first engagement portion 75 are engaged with each other.

  Accordingly, the inclined portion 75d has a function of facilitating the engagement between the second engagement portion 24 and the first engagement portion 75. Thereby, assembly property improves. Therefore, the assembling work can be performed in a short time, the productivity is improved, and the product cost is reduced.

Next, the burr state when the second engagement portion 24 and the first engagement portion 75 are engaged will be described. FIG. 10 is a diagram corresponding to FIG. 5 in the engaged state.
As shown in FIG. 10, the protrusion 75c contacts the side surface 24b, but the burr 75z does not contact the side surface 24b. Thus, the protrusion 75c is in contact with the side surface 24b in a state where the second engagement portion 24 and the first engagement portion 75 are engaged, and is formed on the side surface portion 75f where the burr 75z is generated. It is formed higher than the protrusion height L2 of 75z.

  For this reason, even when the burr 75z is generated, the protrusion 75c is formed higher than the burr 75z. Therefore, in the engaged state of the second engagement part 24 and the first engagement part 75, the burr 75z. Will not be affected by. Therefore, the assembling property can be maintained without being affected by the burr 75z. Moreover, since it can be easily assembled even if the burr 75z occurs, the generation of defective products due to the burr 75z can be suppressed, and the increase in product cost can be suppressed.

  In the engaged state of the first engaging portion 75 and the second engaging portion 24, the projecting portion 75c is in contact with the side surface portion 24b with a certain amount of clearance, but between the shutter substrate 20 and the blade pressing plate 70. In order to suppress position variation after assembly, the clearance may be adjusted to be small. In this case, the adjustment of the clearance between the protruding portion 75c and the side surface portion 24b can be easily performed by additional machining on the mold side of the protruding portion 75c. Similarly, when the projecting portion 75c and the side surface portion 24b function as an attachment guide for the shutter substrate 20 and the blade pressing plate 70, the projecting portion 75c and the side surface portion 24b are contacted with a certain amount of clearance. Clearance adjustment can be easily performed.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

  In the blade driving device 1 of the present invention, the embodiment in which the actuator unit 10 is on the subject side has been described in detail, but the blade pressing plate 70 may be on the subject side.

  The inclined portion 75d is inclined in a conical shape, but is not limited to such a shape, and may be inclined in a planar shape.

  In the above embodiment, the blade pressing plate 70 has the first engaging portion 75 and the shutter substrate 20 has the second engaging portion 24. However, the blade pressing plate 70 has the second engaging portion 24. And the shutter substrate 20 may include the first engaging portion 75.

  In the above embodiment, the case where the snap fit mechanism according to the present invention is employed in the blade driving device has been described, but the snap fit mechanism according to the present invention may be employed in other devices.

It is a disassembled perspective view of a blade drive device. It is a perspective view of a 1st engaging part. It is a front view of a 1st engaging part. It is a top view of a 1st engaging part. It is AA sectional drawing of FIG. It is a top view of the 2nd engaging part. It is BB sectional drawing of FIG. It is a top view in the engagement state of the 2nd engaging part and the 1st engaging part. It is CC sectional drawing of FIG. FIG. 6 is a view corresponding to FIG. 5 in the engaged state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blade drive device 10 Actuator unit 11 Output pin 20 Shutter board | substrate 21, 31, 61, 71 Opening part 22 Escape hole 23 Columnar member 24 2nd engaging part 24a collar part 24b Side surface part 24c Inclined surface 30 1st blade receiving plate 32 , 62 Notch 40 First blade 41, 51 Long hole 42, 52, 73, 74 Shaft hole 50 Second blade 60 Second blade receiving plate 70 Blade retainer plate 70a Fixed surface 70b Hole portion 72 Arc hole 75 First engagement Part 75a claw part 75b body part 75c protrusion part 75d inclined part 75e inclined surface 75f side part 75z burr

Claims (3)

A first engagement portion having a claw portion, and a second engagement portion having a claw locking portion that can be engaged with the claw portion,
The first engagement portion has a protrusion that contacts the second engagement portion in a state of being engaged with the second engagement portion,
The protrusion is formed on a surface where the burr of the first engaging portion can be generated, and is formed higher than a protruding height of the burr that can be generated from the surface. Fit mechanism.   The snap fit mechanism according to claim 1, wherein the protrusion has an inclined surface that facilitates engagement with the second engagement portion. A substrate having an opening, a blade that opens and closes the opening, a blade receiving plate that holds the blade between the substrate, and the snap-fit mechanism according to claim 1,
The blade driving device, wherein the substrate and the blade receiving plate are assembled by the snap-fit mechanism.

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