JP5451264B2 - Drive unit and shutter unit - Google Patents

Description

  The present invention relates to a drive unit and a shutter unit including a motor, and more particularly to a motor vibration isolation structure.

  2. Description of the Related Art Conventionally, a digital camera includes a charge driving unit for performing shutter charge driving, mirror charge driving, and the like with the power of a motor. In shutter charge drive, the shutter charge lever is rotated by the output of the motor, and the shutter blade drive spring is charged with spring force. In the mirror charge drive, the mirror charge lever is rotated by the output of the motor to charge the mirror drive spring with a spring force.

  As one of means for suppressing the vibration and noise of the motor during the charge driving, a vibration absorbing member such as butyl rubber is interposed between the camera body and the motor, and the motor or a gear train including the motor is supported in a floating manner. An anti-vibration structure is mentioned. Details of the conventional example will be described below.

  FIG. 6 is an exploded structural view showing an example of a charge driving unit provided in a conventional digital camera.

  The motor 100 is fastened to the motor base plate 101 with screws 102. The motor base plate 101 is fitted with a vibration-absorbing rubber bush 103 made of butyl rubber or the like. The motor base plate 101 is fastened to the drive unit base plate 105 with a step screw 104 through a rubber bush 103. The drive unit base plate 105 is provided with a gear train (not shown) so as to transmit the output of the motor 100, and the drive unit base plate 105 is fixedly fastened to the camera body (not shown).

  With the configuration described above, the motor 100 is supported in a floating manner with respect to the drive unit base plate 105 because the motor 100 does not directly contact the drive unit base plate 105 via the rubber bush 103. That is, the motor 100 is supported in a floating manner with respect to the camera body (not shown). For this reason, vibration during driving of the motor 100 is attenuated by the rubber bush 103 and is not easily transmitted to the camera body (not shown).

  FIG. 7 is an exploded view showing another form of the charge drive unit provided in the conventional digital camera.

  A pinion gear 201 is fitted to the output shaft of the motor 200. The motor 200 is incorporated into the gear box 203 via the motor floating rubber 202. At this time, the motor 200 is positioned in the gear box 203 by fitting the metal 200a of the motor 200 into the gear box fitting hole 203a.

  A rubber washer 205 is fitted into the corrugated screw 204. The motor 200 is fastened to the gear box 203 with a step screw 204 fitted with a rubber washer 205. The gear box 203 is fixedly fastened to a camera body (not shown).

  With the configuration described above, the motor 200 is in contact with the gear box 203 through the motor floating rubber 202 and the step screw 204 fastened to the motor is in contact with the gear box 203 through the rubber washer 205. Is supported floating. For this reason, since the vibration of the motor 200 transmitted to the gear box 203 is attenuated by the motor floating rubber 202 and the rubber washer 205, the vibration of the motor 200 is not easily transmitted to the camera body (not shown).

  On the other hand, in the floating support of the conventional reduction gear train, the front stage portion where the rotational speed is high and the noise generation is large is floatingly supported, and the rear stage portion where the rotational speed is low and the noise generation is small is fixedly supported. At this time, the distance between the shafts varies between the gear that is supported in a floating manner and the gear that is supported in a fixed manner, and this causes a problem in driving the gear and generation of noise noise. Therefore, a drive mechanism using a planetary gear as an interface has been proposed so that the distance between the shafts of the floatingly supported gear and the fixedly supported gear can be always kept constant (see, for example, Patent Document 1).

JP-A-9-61915

  However, in the configuration of the conventional example shown in FIG. 6, the rubber bush 103 is arranged outside the motor outer cylinder, and a larger area than the motor outer cylinder is spent for floating support, so the space efficiency is not good. For this reason, the floating support configuration of FIG. 6 is not suitable for mounting on a shutter unit configured in a space-saving manner.

  In the configuration of the conventional example shown in FIG. 7, when the fitting length between the motor 200 and the gear box 203 is short, the position of the pinion gear 201 becomes unstable due to the falling of the motor 200. As a result, the distance between the shafts of the pinion gear 201 and the driven gear varies, causing noise noise during driving.

  Further, the configuration of the above-mentioned Patent Document 1 can be implemented when the shutter unit and the motor are separate, and it is difficult to apply to the shutter unit from the viewpoint of configuration and space.

  In view of the above-described conventional problems, an object of the present invention is to construct a vibration-proof structure that absorbs vibration of a motor in a space-saving manner.

In order to achieve the above object, a drive unit of the present invention includes a motor, a motor support member that supports a planetary gear mechanism driven by the output shaft of the motor, and a gear that can mesh with the planetary gear mechanism. A gear support member to be supported, and a ground plate on which the gear support member is fixedly supported and the motor support member is supported in a floating manner, and the motor support member is a surface orthogonal to the output shaft of the motor. , together with the fixedly supporting the motor, the motor is float supported relative to the base plate in a plane perpendicular to the surface to be fixedly supported, the motor support member, the gear support member which is fixedly supported on said base plate is positioned against, it characterized that you have been suspended supported by the base plate.

The shutter unit of the present invention includes a shutter blade chamber portion in which shutter blades are housed, a shutter drive portion in which a shutter drive lever biased to drive the shutter blades is disposed, and the shutter drive lever as a spring. A shutter unit including a shutter charge unit in which a motor that charges against a force is disposed, the motor supporting member supporting the motor and a planetary gear mechanism driven by an output shaft of the motor, and the planet A gear support member that supports a gear that can mesh with a gear mechanism; and a base plate of the shutter charge portion on which the gear support member is fixedly supported and the motor support member is supported in a floating manner. support member, in a plane perpendicular to the output shaft of the motor, is fixed supporting the motor, the motor is solid A support the surface to is floating supported relative to the base plate in the plane perpendicular to the motor supporting member is positioned with respect to said gear support member which is fixed and supported on the base plate, is suspended supported by the base plate It is characterized by that.

  According to the drive unit of the present invention, the vibration-proof structure that absorbs the vibration of the motor can be configured in a space-saving manner.

It is a principal part disassembled perspective view of the shutter unit which concerns on embodiment. It is a disassembled perspective view which shows the detailed structure of the shutter charge unit in FIG. It is the disassembled perspective view which looked at the shutter charge unit shown in FIG. 2 from the reverse direction. It is a perspective view which shows the decomposition | disassembly component of the motor unit and gearbox in embodiment. It is a layout diagram of a motor unit and a rubber bush according to the embodiment. It is an exploded view showing an example of a charge drive unit provided in a conventional digital camera. It is an exploded view showing another form of the charge drive unit provided in the conventional digital camera.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Overall configuration of shutter unit>
FIG. 1 is an exploded perspective view of a main part of a shutter unit according to an embodiment of the present invention.

  As shown in FIG. 1, the shutter unit 300 according to the present embodiment is provided in an imaging apparatus, and is roughly divided into three parts: a shutter blade chamber 301, a shutter driving unit 302, and a shutter charge unit 303.

  The shutter blade chamber 301 is a portion that adjusts exposure to the image pickup device by running of the shutter leading blade and the shutter trailing blade, and the shutter leading blade and the trailing blade are accommodated in the blade chamber. The shutter drive unit 302 is a drive unit that causes the front blade and the rear blade of the shutter to travel at a predetermined blade speed. The shutter leading blade and the shutter trailing blade travel by the spring force of the leading blade driving spring and the trailing blade driving spring that are locked to the leading blade driving lever and the trailing blade driving lever (shutter driving lever), respectively. The shutter driving unit 102 is provided with a spring-biased leading blade driving lever and trailing blade driving lever.

  The spring forces of the leading blade driving spring and the trailing blade driving spring are charged by rotating the leading blade driving lever and the trailing blade driving lever by a driving lever cam mechanism provided in the shutter driving unit 302, respectively. The shutter charge unit 303 is a mechanism that transmits the output of the motor, rotates the shutter charge lever, and charges the front blade drive spring and the rear blade drive spring with the spring force via the drive lever cam mechanism. Then, by releasing the spring force of the charged front blade driving spring and rear blade driving spring, the front blade driving lever and the rear blade driving lever rotate, and the shutter front blade and the shutter rear blade run.

<Configuration of shutter charge unit>
Next, as an example of the drive unit, the configuration of the shutter charge unit 303 in the present embodiment will be described with reference to FIGS.

  FIG. 2 is an exploded perspective view showing a detailed configuration of the shutter charge unit 303 in FIG. 1, and FIG. 3 is an exploded perspective view of the shutter charge unit 303 shown in FIG.

  The shutter charge unit 303 is a gear unit including a motor 304. In the motor 304, a pinion gear 306 is fitted to the output shaft 304a. The pinion gear 306 is a helical gear and meshes with a sun gear 307, which is also a helical gear, in a direction perpendicular to the rotation axis.

  The sun gear 307 is a two-stage gear, and the planetary gear 308 meshes with the small gear side. The planetary gear 308 is held by the planetary arm 309 so that it can revolve around the sun gear 307. The planetary gear 308 is given a revolving force by the rotation of the sun gear 307 and revolves in the same direction as the rotation direction of the sun gear 307.

  The motor 304, the sun gear 307, the planetary gear 308, and the planetary arm 309 (see FIG. 4) are held by a motor support member 310 made of a pressed product. The motor 304 is fastened on a surface orthogonal to the output shaft of the motor 304 of the motor support member 310, and a sun gear shaft 310a that engages the sun gear 307 and the planetary arm is formed. Here, the motor support member 310 having drive members from the motor 304 to the planetary gear 308 can be handled as a subunit of the shutter charge unit 303. The details of this subunit will be described later with reference to FIG.

  A motor support member 310 having a motor 304, a pinion gear 306, a sun gear 307, a planetary gear 308, and a planetary arm 309 is a surface orthogonal to the surface to which the motor 304 is fixed, and a shutter sub ground plate included in the shutter drive unit 302. 311 is supported in a floating manner. A vibration-absorbing rubber bush 312 made of butyl rubber or the like is fitted into the shutter sub base plate 311. The motor support member 310 is attached to the shutter sub base plate 311 with a step screw 313 via a rubber bush 312. The rubber bush 312 is pressed in the fastening direction by the step screw 323. In such a state, since the motor support member 310 is attached without being in direct contact with the shutter sub base plate 311, the motor support member 310 is floatingly supported with respect to the shutter sub base plate 311.

  In the above state, the pressing direction of the motor output shaft 304a and the rubber bush 312 is orthogonal, and the rubber bush 312 and the step screw 313 sandwich the center of the motor unit 326 in the longitudinal direction of the motor 304. It is arranged at the position opposite to. Further, a part of the rubber bush 312 and the stepped screw 313 is fastened to a standing bending tip portion of the motor support member 310 and is disposed in a projection plane from the optical axis direction of the motor 304. With this configuration, the floating support structure can be accommodated in the outer shape of the motor 304 as viewed from the shutter optical axis, so that the motor vibration isolation structure can be configured in a small space.

  On the other hand, the planetary gear 308 is configured to mesh with the reduction gear 314 by revolving around the sun gear 307. The inter-axis distance between the planetary gear 308 and the reduction gear 314 is kept constant by restricting the revolution of the planetary gear 308 by abutment between a planetary gear shaft 309b (described later) and a stopper 316b of the gear box 316. By configuring in this way, it is possible to maintain the distance between the shafts properly even in a gear train having a floating support structure.

  The reduction gear 314 is a two-stage gear, and the planetary gear 308 meshes with the large gear side, and the cam gear 315 meshes with the small gear side. The cam gear 315 has a cam 315 a, and the cam 315 a rotates according to the rotation of the cam gear 315 to rotate the shutter charge lever 305. The reduction gear 314 and the cam gear 315 are held by a gear box 316 so as to be rotatable. The gear box 316 is fastened to the shutter sub base plate 311 by a screw 317.

  The motor support member 310 is assembled after the gear box 316 is fastened to the shutter sub base plate 311. At this time, the motor support member 310 is positioned on the gear box 316 by the shaft foot portion of the sun gear shaft 310 a that is crimped to the motor support member 310 and the positioning hole 316 a provided in the gear box 316. In this state, since the positions of the sun gear 307 and the reduction gear 314 are determined by the gear box 316, the angle between the center of the planetary gear 308 and the center of the sun gear 307 and the center of the reduction gear 314, that is, the planetary gear. The meshing angle of the gear 308 is always constant. With this configuration, the meshing angle between the planetary gear and the driven gear is stabilized, and the planetary gear meshing / separating operation can be performed smoothly.

  Further, the pinion gear cover 318 is fastened to the gear box 316 with screws 319 in a state where the gear box 316 and the motor support member 310 are attached to the shutter sub base plate 311.

  With the above configuration, the output of the motor 304 is converted into the rotational movement of the shutter charge lever 305 via the pinion gear 306, the sun gear 307, the planetary gear 308, the reduction gear 314, and the cam gear 315. Then, the leading blade driving spring and the trailing blade driving spring are charged via a driving lever cam mechanism provided in the shutter driving unit 302.

<Configuration of motor unit>
Next, the configuration of the motor unit 326, which is a subunit of the shutter charge unit 303, will be described with reference to FIG.

  FIG. 4 is a perspective view showing an exploded part of the motor unit 326 and the gear box 316 in the present embodiment.

  As described above, the motor 304 is fastened to the motor support member 304 with screws 320. A sun gear shaft 301 a is caulked on the motor support member 310. The planetary arm 309 is caulked with a solar metal 309 a that engages with the sun gear 307 and a planetary gear shaft 309 b that engages with the planetary gear 308 and the jump prevention arm 321. A planetary metal 321 a that engages with the planetary gear 308 and a jumping prevention pin 321 b are caulked on the jumping prevention arm 321.

  A coil spring 322 and a planet gear 308 are engaged with the planetary metal 321a crimped to the jump preventing arm 321 and fixed by an E ring 323 so as to be rotatable. The planetary gear 308 can obtain a revolution force by the frictional force of the coil spring 322. The jump prevention arm 321 having the planetary gear 308 and the coil spring 322 is engaged with the planetary gear shaft 309b caulked by the planetary arm 309, and is fixed by an E ring 324 so as to be rotatable.

  Further, a sun gear 307 is engaged with the solar metal 309 a that is crimped to the planetary arm 309. A planetary arm 309 having a planetary gear 308, a jump prevention arm 321, and a sun gear 307 is engaged with a sun gear shaft that is crimped to the motor support member 310 and is rotatably fixed by an E-ring 325. At this time, the jump prevention pin 321b crimped to the jump prevention arm 321 is inserted into the hole 310b of the motor support member. Further, since the jump prevention arm 321 is engaged with the planetary gear shaft 309b together with the planetary gear 307, it is configured to revolve around the sun gear 307 along the same orbit as the planetary gear 307.

  Here, the function of the jump prevention arm 321 will be briefly described. When the shutter charge unit 303 is driven, a rotational speed difference is generated between the reduction gear 314 and the planetary gear 308. When the rotational speed of the reduction gear 308 exceeds the rotational speed of the planetary gear 308, the planetary gear 308 is reduced. Trying to leave 314. At this time, the jump prevention pin 321a of the jump prevention arm 321 that moves in the same orbit as the planetary gear 308 is thrust at the end face of the hole 310b of the motor support member to prevent the planetary gear 308 from being separated from the reduction gear 321.

  When the motor unit 326 is assembled to the shutter sub base plate 311, the shaft foot of the sun gear shaft 310 a and the positioning hole 316 a of the gear box 316 are fitted, and the motor unit is positioned in the gear box 316. . With this configuration, since the positions of the sun gear 307 and the reduction gear 314 are determined, the engagement angle between the planetary gear 308 and the reduction gear 314 is stabilized, and the engagement / disengagement operation of the planetary gear 308 can be performed smoothly.

<Motor and rubber bush layout>
Next, the layout of the motor unit 326 and the rubber bush 312 will be described with reference to FIG.

  FIG. 5 is a layout diagram of the motor unit 326 and the rubber bush 312 according to the present embodiment, and shows the positional relationship between the motor unit 326 and the rubber bush 312 that supports the motor unit 326 in a floating manner.

  In FIG. 5, 500 is a horizontal axis center line that equally divides the motor unit 326 up and down, and 501 is a vertical axis center line that equally divides the motor unit 326 left and right. The upper right area divided by the horizontal axis center line 500 and the vertical axis center line 501 is the A area, the upper left area is the B area, the lower left area is the C area, and the lower right area is the D area. The horizontal axis center line 500 and the vertical axis center line 501 And the center 502 of the motor unit 326. At this time, the rubber bush 312 is disposed in the B region and the D region so as to face the center 502. In the C region, a rubber bush 312 is disposed at a position facing the rubber bush 312 in the B region with the horizontal axis 500 interposed therebetween.

<Advantages according to the present embodiment>
According to the present embodiment, in shutter unit 300, motor 304 is arranged such that motor output shaft 304a and the optical axis direction of shutter unit 300 are perpendicular to each other. Further, the rubber bushing 312 is arranged so that the pressing direction of the rubber bushing 312 is perpendicular to the motor output shaft 304 a, and the rubber bushing 312 is arranged facing the center of the motor support member 310. And it comprised so that at least 1 place of the floating support structure might be settled in the projection surface of the motor 304 from an optical axis direction. Thereby, in the shutter unit 300, the floating support structure of the motor, that is, the anti-vibration structure that absorbs the vibration of the motor can be configured in a space-saving manner.

  Further, the motor 304 and the first stage gear (sun gear 307) meshing with the pinion gear 306 are supported by the same motor support member 310. Further, the planetary interface is provided between the gears (pinion gear 306, sun gear 307, planetary gear 308) arranged on the motor support member 310 that is supported in a floating manner and the gears (reduction gear 314, cam gear 315) arranged on the fixed side. The gear 308 is used. Thereby, even in the gear train having the floating support structure, the distance between the shafts of the gears can be maintained appropriately, and the generation of noise noise during driving can be prevented.

  The motor support member 310 includes a sun gear shaft 310a disposed on the motor support member 310 that is supported in a floating state, and a positioning hole 316a of a gear box 316 that holds a driven gear (a reduction gear 314) of the planetary gear 308. The gear box 316 is positioned. Thereby, the meshing angle between the planetary gear 308 and the driven gear is stabilized, and the meshing / separating operation of the planetary gear 308 can be performed smoothly.

<Modification>
In addition, this invention is not limited to said embodiment, A various deformation | transformation is possible. Examples of such modifications include the following.

  (1) In the above-described embodiment, the optical axis direction of the shutter unit 300 and the pressing direction of the rubber bush 312 are the same direction. However, the present invention is not limited to this. You may comprise so that the pressing direction of 312 may become an orthogonal direction.

  (2) In the above-described embodiment, the configuration is described as the charging unit of the shutter. However, the configuration is not limited thereto, and may be configured as, for example, a mirror charging unit.

303 Shutter charge unit 304 Motor 307 Sun gear 308 Planetary gear 310 Motor support member 311 Shutter sub-base plate 312 Rubber bushing 313 Step screw 314 Reduction gear 316 Gear box

Claims (2)

A motor support member that supports a motor and a planetary gear mechanism driven by the output shaft of the motor ;
A gear support member that supports a gear that can mesh with the planetary gear mechanism;
A ground plate on which the gear support member is fixedly supported and on which the motor support member is supported in a floating manner ,
The motor support member is supported in a floating manner with respect to the ground plane on a surface orthogonal to a surface on which the motor is fixedly supported , while fixing and supporting the motor on a surface orthogonal to the output shaft of the motor ,
The motor support member drive unit is positioned with respect to said gear support member which is fixed and supported on the base plate, characterized that you have been suspended supported by the base plate. A shutter blade chamber portion in which the shutter blades are housed, a shutter drive portion in which a shutter driving lever biased to drive the shutter blades is disposed, and the shutter driving lever charged against a spring force A shutter unit comprising a shutter charge unit in which a motor is disposed ,
A motor support member that supports the motor and a planetary gear mechanism driven by the output shaft of the motor;
A gear support member that supports a gear that can mesh with the planetary gear mechanism;
The gear support member is fixedly supported, and the ground plate of the shutter charge portion, on which the motor support member is supported in a floating manner,
The motor support member is supported in a floating manner with respect to the ground plane on a surface orthogonal to a surface on which the motor is fixedly supported , while fixing and supporting the motor on a surface orthogonal to the output shaft of the motor ,
The motor supporting member is positioned with respect to said gear support member which is fixed and supported on the base plate, a shutter unit, characterized that you have been suspended supported by the base plate.