JP2005091530A - Sector driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sector driving device where an upper case is efficiently arranged and fixed on an electromagnetic actuator even when the device is made small-sized. <P>SOLUTION: In the sector driving device 1 including a shutter base plate 10, the electromagnetic actuator 20 for driving a sector 40 placed on the base plate 10, and a plate type presser member 30 pressing the actuator 20 from an upper side, a positioning part 11 on which the member 30 is locked is erected from the base plate 10, and the member 30 is equipped with a recessed part, where a fitting hole 31 to receive the edge part of the positioning part 11 is arranged at its bottom part. When the edge part of the positioning part 11 is irradiated with a laser beam or the like, the member 30 is welded. Since the fitting hole 31 is arranged at the bottom part of the recessed part, melt is collected on the periphery of the fitting hole 31. Since the recessed part functions also as a melt reservoir part, the melt is restrained from being scattered to the periphery. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sector drive device for optical equipment. More specifically, the present invention relates to a sector drive device that is suitable for downsizing and is excellent in assembling.

  In recent years, optical devices such as digital cameras have been rapidly miniaturized. In particular, digital cameras built into mobile phones are extremely small. The sector drive device built into such a camera becomes even smaller. In the manufacturing process, it is necessary to consider that dust and foreign matters are not mixed and to assemble with high accuracy.

  Even a small sector drive device is provided with an electromagnetic actuator for driving a sector on a shutter substrate, as in a normal sector drive device. This electromagnetic actuator is fixed to the substrate by a pressing member generally called an upper case or an upper cover. Patent document 1 is disclosing the general structure of the conventional pressing member. In Patent Document 1, a cover plate (pressing member) is formed so as to be fixed to a shutter base plate (shutter substrate) with screws, and an electromagnetic actuator is disposed between the two.

Japanese Patent Laid-Open No. 9-152645

  As described above, in Patent Document 1, the pressing member is fastened to the substrate using screws. However, for example, recent digital cameras incorporated in mobile phones are becoming so small that the pressing member cannot be fixed using screws. Therefore, in order to lock the pressing member, a resin positioning pin is raised from the substrate side, and the pressing member is provided with a hole portion into which the positioning pin is inserted. And the method of melt | dissolving the head of this positioning pin with a laser etc. and welding a pressing member is employ | adopted. With such a method, since the solidified piece solidified after the head of the positioning pin melts functions to fix the pressing member, even a fine portion can be fixed as compared with the case where screws are used.

  However, when a hole for fitting a positioning pin is formed in the presser member, a solidified piece exists on the surface of the presser member. Moreover, the melted material that has melted and dropped from the head of the positioning pin may scatter to other places. The melt scattered around the periphery is solidified into solidified pieces. This solidified piece is a foreign substance in the sector drive device, and it contaminates the minute device and causes a malfunction. Further, the solidified piece raised on the upper surface of the pressing member may become an obstacle when other parts are assembled later.

  Therefore, an object of the present invention is to provide a sector drive device that can efficiently fix the presser member on the top of the electromagnetic actuator even if the size is reduced, and that does not cause the above-described failure after the presser member is fixed. That is.

  The object described above is a sector drive device including a shutter substrate, a sector drive electromagnetic actuator placed on the shutter substrate, and a plate-like pressing member that clamps and fixes the electromagnetic actuator to the shutter substrate. A positioning portion for positioning the pressing member is erected from the shutter substrate, and the pressing member is provided with a recess for receiving the distal end portion of the positioning portion, and is fitted with an intermediate portion of the positioning portion. This is achieved by a sector driving device in which a fitting hole is provided in the bottom of the recess.

  According to this invention, if the front-end | tip part of a positioning part is inserted in a fitting hole, it can take out to the upper side of a pressing member. Therefore, if this positioning portion is formed of resin or the like and irradiated with laser light or the like, the tip portion of the positioning portion is melted, so that the pressing member can be welded to the positioning portion. Here, since the said fitting hole is arrange | positioned at the bottom part of a recessed part, a melt can be collected around a fitting hole. Therefore, it is possible to realize a structure in which the pressing member is fixed to the positioning portion by the solidified piece in which the melt is solidified. Moreover, since the said recessed part functions also as a reservoir part of a molten material, it can suppress that a molten material scatters around. Therefore, the situation which contaminates the periphery when fixing the pressing member can be suppressed.

  Moreover, it is desirable that the recess has a structure having a tapered surface inclined toward the fitting hole. With such a structure, a fluid melt can be guided to the fitting hole located at the bottom of the recess. Further, since the solidified piece obtained by solidifying the melt does not protrude from the upper surface of the pressing member, it does not hinder the subsequent process.

  Moreover, it is desirable that the height positions of the positioning portion and the pressing member are adjusted so that the distal end portion of the positioning portion is positioned in the recess. By adjusting the height in this way, the melt can be guided to the peripheral portion of the fitting hole while preventing the positioning portion heated and melted by a laser or the like from scattering to the peripheral portion. Therefore, the pressing member can be reliably fixed to the positioning portion. Moreover, the efficiency in an assembly | attachment process can be achieved and the contamination to a surrounding part can also be suppressed.

  The positioning portion and the fitting hole are preferably molded so as to be fitted at a predetermined position. If designed in this way, the fitting hole can be easily positioned with respect to the positioning portion, so that the efficiency in the assembly process can be improved.

  As described above, according to the present invention, the pressing member can be arranged with the electromagnetic actuator sandwiched efficiently even in a sector drive apparatus that is downsized. In addition, after the presser member is installed, no obstacles to the periphery as pointed out above are generated.

  Hereinafter, a sector drive device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a sector drive device 1 according to the embodiment. 1A is a plan view of the apparatus 1, and FIG. 1B is a cross-sectional view taken along the line CC of the apparatus viewed from the right side.

  The sector drive device 1 has a basic configuration in which a sector drive electromagnetic actuator 20 is mounted on a shutter substrate 10 and an upper case 30 as a pressing member is disposed on the electromagnetic actuator 20. The shutter substrate 10 is plate-shaped, but its rear end side (lower side in FIG. 1) stands up. An electromagnetic actuator 20 is disposed on the inner side, and an upper case 30 is disposed thereon. According to FIG. 1 (B), the structure of the electromagnetic actuator 20 can be confirmed more clearly. An exciting coil 21 is fixed to the stator 24 of the electromagnetic actuator 20. A rotor 22 that rotates about a shaft 23 is disposed on the front end side of the stator 24.

  A shutter opening 15 is formed at a substantially central portion of the flat portion of the shutter substrate 10. A blade-like sector 40 that opens and closes the shutter opening 15 is swingably disposed on the bottom side of the shutter substrate 10 (right side in FIG. 1B). The sector 40 includes a plurality of blade-like members, which are generally indicated by reference numeral 40 here. In FIG. 1A, the sector 40 cannot be confirmed, but the operating pin 25 connected to the rotor shaft 23 of the electromagnetic actuator 20 penetrates to the bottom side, and the operating pin 25 causes the sector 40 to swing.

  The upper case 30 is disposed so as to substantially cover the upper portion of the electromagnetic actuator 20. The upper case 30 includes two fitting holes 31a and 31b. Positioning pins 11a and 11b as positioning portions rising from the shutter substrate 10 are fitted in the fitting holes 31a and 31b, respectively. These fitting holes 31a and 31b receive the positioning pins 11a and 11b inside, and allow their tip portions to penetrate to the opposite side. That is, the tip portions of the positioning pins 11a and 11b are inserted into the fitting holes 31a and 31b of the upper case 30 and protrude to the upper surface side. The fitting holes 31a and 31b are set so as to be located at the bottom of the recess. Specifically, a state in which the fitting holes 31a and 31b are located in the center of the bottom of the concave portion formed into a mortar shape by the tapered surfaces 32a and 32b inclined in the direction of reducing the diameter formed in an annular shape is formed. A more detailed configuration around the fitting holes 31a and 31b will be described later.

  Guide pins 12 further rise from the shutter substrate 10. The guide pin 12 has an arc-shaped cross section as shown in the figure, and is arranged so as to be positioned just at the lower end of the upper case 30. An arcuate groove 33 for receiving the guide pin 12 is formed on the upper case 30 side. Therefore, the upper case 30 is sandwiched between the shutter substrate 10 and the electromagnetic actuator 20 so that the fitting holes 31a, 31b and the groove 33 are just fitted to the three pins 11a, 11b, 12 rising from the shutter substrate 10 side. Is set as In FIG. 1A, the three pins 11a, 11b, and 12 are hatched so that they can be easily confirmed.

  Further, projections 35a and 35b for positioning the FPC are formed on the upper surface of the upper case 30 so as to protrude upward. These protrusions 35 a and 35 b position a flexible substrate (FPC) 50 disposed on the upper portion of the upper case 30. After the FPC 50 and the electromagnetic actuator 20 are electrically connected, the sector drive device 1 is set in an optical device such as a camera. Although FIG. 1A omits the illustration of the FPC 50 so that the configuration of the sector drive device 1 can be easily confirmed, the FPC 50 is illustrated in FIG. A member indicated by reference numeral 60 disposed outside the sector 40 is a sector pressing plate.

  FIG. 2A shows the relationship between the upper case 30 and the positioning pins 11 in the cross-sectional view taken along the line AA in FIG. Similarly, FIG. 2B shows the relationship between the upper case 30, the electromagnetic actuator 20, and the shutter substrate 10 in the cross-sectional view taken along the line BB in FIG.

  In FIG. 2A, it can be confirmed that the positioning pins 11 a and 11 b raised from the shutter substrate 10 are fitted in the fitting holes 31 a and 31 b formed in the upper case 30. Moreover, the fitting holes 31a and 31b are located in the recessed part DP enclosed by the taper surfaces 32a and 32b in which the upper side was formed cyclically | annularly. That is, it can be confirmed that the fitting holes 31a and 31b are formed at the bottom of the recess DP. Further, according to FIG. 2B, it can be confirmed that the upper end of the shaft 23 of the electromagnetic actuator 20 is fitted to the upper case 30 and that the entire electromagnetic actuator 20 is covered with the upper case 30. 2A and 2B, the details of the sector 40 shown comprehensively in FIG. 1 are shown. As shown in FIG. 2, the sector drive device 1 includes two shutter blades 40a and 40b.

  FIG. 3 is an enlarged view of the upper case 30 of the sector drive device 1 of FIG. A characteristic configuration included in the sector drive device 1 will be described in more detail with reference to FIG. FIG. 3A is an enlarged view of the top surface and the left side of the upper case 30. Moreover, the figure (B) is CC sectional view taken on the line in (A).

  In FIG. 3A, when the shapes of the two fitting holes 31a and 31b are compared, the fitting hole 31b has a substantially perfect circle shape. (String part) is included. In FIG. 3A, two string portions LN-1 and LN-2 are formed so as to face each other vertically. In other words, the fitting hole 31b is a simple circle, but the fitting hole 31a is a pseudo circle that partially includes the string portion LN. The positioning pin 11 to be inserted into these holes has a cross-sectional shape (a surface parallel to the paper surface of FIG. 3) formed into a shape corresponding to these holes. Therefore, the fitting hole 31a and the positioning pin 11a are fitted only at a predetermined position. As a result, the upper case 30 can be easily and reliably positioned with respect to the positioning pin 11 in the assembling process, so that efficient work can be performed.

  In the case of the sector driving apparatus 1, the upper case 33 includes the groove 33 at the lower end as described above. The guide pin 12 rising from the substrate is engaged with the groove 33. Therefore, in the assembling process, the upper case 30 can be efficiently disposed on the electromagnetic actuator 20 while being more reliably positioned.

  As shown in FIG. 3B, an annular taper surface 32 inclined toward the fitting hole 31b is formed on the peripheral portion of the fitting hole 31b to form a concave shape. Moreover, the recess DP is formed as if the upper surface of the pressing member 30 is dug down. The tip portion HD of the positioning pin 11b rising from the shutter substrate 10 is located in the space in the recess DP. The positioning pins 11 are set in an upright state by integral molding with the shutter substrate 10 or by driving a pin-like member into the substrate surface. The positioning pin 11 is formed of a resin material that melts when heated. When the tip portion HD is melted by irradiation with laser light or the like as shown, a part of the tip portion is melted and flows downward. When this hardens, it becomes a solidified piece PR. The solidified piece PR adheres to the tip portion HD having a reduced height and welds the upper surfaces of the pins 11b and the upper case 30. Therefore, the pressing member 30 can be fixed to the positioning pins 11 extending from the shutter substrate 10 side without using screws or the like as in the prior art, and the electromagnetic actuator 20 can be reliably held therebetween.

  In particular, as illustrated in FIG. 3B, if the tip portion HD of the positioning pin 11b is in the recessed portion DP, the resin that has melted when heated by laser light or the like is scattered around the peripheral portion. And can be retained in the recess DP. Since the melted resin can fix the head, the upper case 30 can be reliably fixed to the positioning pins 11b while preventing scattering of the head. Moreover, since the peripheral wall which forms the recessed part DP becomes the taper surface 32b which inclines toward the fitting hole 31b, the melted melt is guide | induced to the fitting hole 31b side and it contributes to adhering of the upper case 30. be able to. Moreover, since the recessed part DP exists in the state dug down from the upper surface of the upper case 30, it does not become an obstacle in a subsequent manufacturing process.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible. In the above-described embodiment, the concave portion DP is formed by digging down as a more desirable structural example. However, when it does not become an obstacle in the manufacturing process, the concave portion DP may be disposed in a protruding state on the upper surface of the upper case 30.

It is the figure which showed the structure of the sector drive device which concerns on embodiment, (A) is a top view of the apparatus, (B) is CC sectional view taken on the line. FIG. 1 shows a configuration of the sector drive device of FIG. 1 when viewed from the front. FIG. 1A is a cross-sectional view taken along the line AA in FIG. It is the figure which showed the relationship with an upper case, an electromagnetic actuator, and a shutter board | substrate in the BB sectional view in 1 (A). It is the figure which expanded and showed the upper case of the sector drive device of FIG. 1, (A) is the figure which expanded and showed the plane and left side of an upper case, (B) is the CC sectional view taken on the line in (A). It is the figure which expanded and showed the partial cross section in.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sector drive device 10 Shutter board 11a, 11b Positioning pin 20 Electromagnetic actuator 30 Upper case 31a, 31b Fitting hole 32a, 32b Tapered surface DP Recessed part HD Positioning pin front-end | tip part

Claims (4)

A sector drive device comprising: a shutter substrate; a sector drive electromagnetic actuator placed on the shutter substrate; and a plate-like pressing member that clamps and fixes the electromagnetic actuator to the shutter substrate.
A positioning portion for positioning the pressing member is erected from the shutter substrate,
A sector drive characterized in that the pressing member is provided with a recess for receiving the distal end portion of the positioning portion, and a fitting hole for fitting with an intermediate portion of the positioning portion is provided at the bottom of the recess. apparatus. The sector driving device according to claim 1, wherein the recess includes a tapered surface inclined toward the fitting hole. 2. The sector drive device according to claim 1, wherein height positions of the positioning portion and the pressing member are adjusted so that a tip portion of the positioning portion is positioned in the concave portion. The sector drive device according to claim 1, wherein the positioning portion and the fitting hole are molded so as to be fitted at a predetermined position.

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