JP2022041035A - Blade driving device - Google Patents

Abstract

To miniaturize a blade driving device in a short side direction.SOLUTION: Disclosed is a blade driving device 103 arranged on a light ray 102 passing through a non-circular lens 100 which includes: a ground plate on which an opening part is provided; a plurality of blade members which moves in the longitudinal direction of the non-circular lens 100 and advances and retreats into the opening part; and a power transmission member which is mounted on the ground plate and transmits a driving force to the plurality of blade members. A diaphragm opening formed by the plurality of blade members is characterized in that a diameter in the direction along the longitudinal direction of the non-circular lens 100 is longer than that in the direction orthogonal to the longitudinal direction in a throttle opening state which is maximum.SELECTED DRAWING: Figure 1

Description

The present invention relates to a blade drive device mounted on an optical device such as a camera or an interchangeable lens and also referred to as a diaphragm device or the like.

In recent years, mobile devices for shooting such as digital still cameras and digital video cameras, and mobile devices having a shooting function such as mobile phones with cameras and mobile information terminals have become widespread. Such mobile devices are required to be miniaturized, and it is naturally necessary to miniaturize each mounted component.

As a means for reducing the size of a camera, a bending optical system as shown in Patent Document 1 is known in which a light beam is reflected (bent) by using a reflecting surface of a reflecting member (bending member) such as a prism or a mirror. The bending optical system is advantageous for miniaturization in an optical system having a long optical path length.

Japanese Unexamined Patent Publication No. 2009-288582

In the light amount adjusting device disclosed in Patent Document 1, a guide pin for guiding the diaphragm blades is provided around the window formed on the base, particularly around the width direction of the diaphragm blades in the advancing / retreating direction. Was a factor in the increase in size.

In view of the above, the blade drive device according to the present invention is
A blade drive device placed on a light beam that passes through a non-circular lens.
The main plate with the opening and
A plurality of blade members that move in the longitudinal direction of the non-circular lens and move back and forth in the opening.
It is provided with a power transmission member attached to the main plate and transmitting a driving force to the plurality of blade members.
The aperture opening formed by the plurality of blade members is such that the diameter of the non-circular lens in the direction parallel to the longitudinal direction is longer than the diameter in the direction orthogonal to the longitudinal direction in the maximum aperture open state. It is a feature.

According to the present invention, the blade driving device can be miniaturized in the lateral direction.

The exploded perspective view which shows the bending optical system lens group structure which concerns on embodiment of this invention. An exploded perspective view showing a blade driving device according to an embodiment of the present invention. The operation explanatory drawing of the diaphragm blade of the blade drive device which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view of a drive unit of the blade drive device according to the embodiment of the present invention.

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

<Embodiment 1>
FIG. 1 shows an exploded perspective view of an example of a lens group structure 1 including a blade driving device according to a first embodiment of the present invention. Further, FIG. 2 shows an exploded perspective view of the diaphragm device 103 as an example of the blade drive device.

FIG. 1 shows a state in which a light ray 102 incident from an image pickup aperture (not shown) provided in a portable device equipped with a lens group structure 1 is bent 90 degrees by a prism 101 and is imaged on an image pickup element 105. ing. The front lens 100, the diaphragm device 103, and the rear lens 104 are arranged in this order on the light ray 102 between the prism 101 and the image pickup element 105.

The light ray 102 whose amount of light is adjusted by the diaphragm device 103 is refracted by passing through the front lens 100 and the rear lens 104, and is imaged on the image sensor 105. As the front lens 100, a non-circular lens having an elliptical shape or a circular two-way shape is used, and in the present embodiment, as shown in FIG. 1, a circular two-way shape lens is used. A circular lens is used for the rear lens 104.

FIG. 2 shows an exploded perspective view of the diaphragm device 103, and an opening 107a is formed in the main plate 107 as a base member. The diaphragm blades 109 and 110, which are blade members driven by the drive lever 108 of the throttle drive unit 106 attached to the main plate 107, are provided in the blade chamber formed between the main plate 107 and the cover 111. The cover 111 is also provided with an opening 111a.

The guide pin 107b and the guide pin 107c (see FIG. 3) formed on the main plate 107 engage with the cam groove 110b of the diaphragm blade 110 and the cam groove 109b of the diaphragm blade 109, and the operation of the diaphragm blade 109 and the diaphragm blade 110 To guide.

The main plate 107 is made of metal or resin, and a rail (not shown) is formed on the inner surface (the surface on the cover 111 side) of the main plate 107 in order to reduce the sliding resistance with the diaphragm blades 109 and 110. ing. Similarly, a rail (not shown) is formed on the cover 111.

FIG. 3 shows a front view of the diaphragm device 103 with the cover 111 removed. The diaphragm drive unit 106 is attached to the main plate 107 at a position distant from the opening 107a in the downward direction in FIG. There is. The driving force generated by the diaphragm driving unit 106 is transmitted to the diaphragm blades 109 and 110 via the drive lever 108 to drive the diaphragm blades 109 and 110. That is, the diaphragm drive unit 106 is a power transmission member for the diaphragm blades 109 and 110.

The left side of FIG. 3 shows the maximum aperture opening formed by the diaphragm blades 109 and 110 (aperture opening), and the right side figure shows the minimum aperture opening (small aperture). In the case of opening the diaphragm, the diaphragm opening may be formed by using the opening 107a or the opening 111a. In the shape of the aperture opening in the open aperture state, the diameter in the direction parallel to the longitudinal direction of the front lens 100 is larger than the diameter in the direction orthogonal to the longitudinal direction of the front lens 100. As an example, as shown in FIG. 1, the shape may be substantially the same as that of the front lens 100.

The aperture drive unit 106 is, for example, an electromagnetic drive composed of a rotor magnet (not shown), a drive lever 108 that rotates integrally with the rotor magnet, and a coil (not shown) that is energized to generate a magnetic force that rotates the rotor magnet. It is a motor. Further, it may be a stepping motor.

Here, the drive lever 108 will be described in detail. As can be seen from the cross-sectional views of the diaphragm drive unit 106 shown in FIGS. 3 and 4, the drive lever 108 includes a blade drive round hole 108a that engages with the drive round shaft 109a provided on the diaphragm blade 109, and a diaphragm blade. A blade drive round hole 108b that engages with the drive round shaft 110a provided in the 110 is provided.

With this configuration, it is possible to eliminate the convex shape protruding in the optical axis direction as compared with the case where the drive lever is provided with a shaft and is inserted into a round hole of a diaphragm blade or the like. In the present embodiment, the drive round shaft 109a of the diaphragm blade 109 and the drive round shaft 110a of the diaphragm blade 110 are inserted toward the drive lever 108 in the optical axis direction, and the drive round shaft 109a is inserted into the main plate 107. , A concave shape 107d that escapes 110a is formed. In this way, the engagement portion between the diaphragm blades 109 and 110 and the drive lever 108 can be accommodated in the space adjacent to the diaphragm drive unit 106 and the drive lever 108 created by attaching the diaphragm drive unit 106 to the main plate 107. The engaging portion can be arranged in a space-saving manner as compared with the one in which the shaft is projected from the drive lever toward the diaphragm blade.

Further, the drive lever 108 is fixed by press-fitting or adhering the press-fitting hole 108c to the rotation center axis 106a of the driving portion 106 located apart from the opening 107a in the downward direction in FIG. As a result, the drive lever 108 is rotated in a predetermined angle range around the rotation center axis 106a. The drive lever 108 is made of metal or resin.

Hereinafter, each diaphragm blade will be described in detail. As shown in FIG. 3, the guide pin 107c of the main plate 107 is engaged with the cam groove 109b of the diaphragm blade 109, and the guide pin 107b is engaged with the cam groove 110b of the diaphragm blade 110. The diaphragm blades 109 and 110 are made of metal or resin.

Further, as shown in FIG. 3, the guide pin 107c and the guide pin 107b of the main plate 107 are inside the dotted lines 110d and 110e, which are extension lines of the portions extending in the advancing / retreating direction of the diaphragm blade 110 at the inner edge portion 110c of the diaphragm blade 110, respectively. It is arranged (on the rotation center axis 106a side of the aperture drive unit 106). In other words, the guide pins 107c and 107d are arranged at positions overlapping with the aperture opening in the width direction orthogonal to the advancing / retreating direction when viewed in the advancing / retreating direction of the diaphragm blade 110, respectively. As a result, the width direction of the diaphragm device can be reduced. Further, the width direction orthogonal to the advancing / retreating direction of the diaphragm blades 109 and 110 may be guided by the side wall portion 111b of the cover 111.

In the present embodiment, the guide pin 107c and the guide pin 107b are arranged between the aperture opening formed by the aperture blades 109 and 110 and the aperture drive unit 106, but the aperture drive unit is arranged with respect to the aperture opening. It may be arranged in the area opposite to 106.

Further, the relationship between the guide pin 107c and the guide pin 107b and the cam groove 109b and the cam groove 110b may be interchanged, and the guide having an engaging portion between the diaphragm blades 109 and 110 and the main plate 107 is provided on one side. Any cam groove may be provided on the pin (shaft) and the other side. Further, the guide pins 107b and 107c may be configured so that a part thereof is located in a region outside the dotted lines 110d and 110e which are extension lines of the inner edge portion 110c of the diaphragm blade 110.

Further, as described with reference to FIG. 4, the diaphragm blade 109 and the diaphragm blade 110 are engaged with the blade drive round hole 108a and the blade drive round hole 108b of the drive lever 108. The drive round shaft 109a and the drive round shaft 110a move with the rotation of the drive lever 108, and the cam groove 109b that engages with the guide pin 107c of the main plate 107 and the cam groove that engages with the guide pin 107b of the main plate 107. At 110b, the engaging position changes along the cam groove. By making such a movement, the diaphragm blade 109 and the diaphragm blade 110 move in the longitudinal direction of the diaphragm device 103. By this movement, the aperture opening can be formed by the two aperture blades 109 and 110, and the size (aperture aperture diameter) thereof can be changed.

According to the configuration of the present embodiment, when the drive lever 108 is rotated to open the throttle, the periphery of the engaging portion (blade drive round hole 108a and drive round shaft 109a) between the drive lever 108 and the diaphragm blade 109. It is possible to prevent the engagement portion (guide pin 107c and cam groove 109b) between the main plate 107 and the diaphragm blade 109 from interfering with the portion. The same effect can be obtained by the reverse configuration of the present embodiment (the configuration in which the pin of the drive lever 108 is inserted into the hole of the diaphragm blade 109), and the diaphragm blade 109 and the diaphragm blade 110 are reversed. It may be configured as.

The cam grooves 109b and 110b of the present embodiment have a curved shape in which the central portion of the cam groove is convex toward the rotation center axis 106a side of the throttle drive unit 106, but may be a linear shape.

Further, in the present embodiment, the drive lever 108 is provided with the blade drive round holes 108a and 108b, and the diaphragm blades 109 and 110 are provided with the drive round shafts 109a and 110a, but the reverse may be applied. That is, the drive lever 108 may be provided with a drive round shaft, and the diaphragm blades 109 and 110 may be provided with blade drive round holes.

In the present invention, by adopting the configuration described above, the width direction of the diaphragm device can be reduced, and the optical device such as a camera or an interchangeable lens equipped with the diaphragm device can also be miniaturized.

The aperture opening may be completely closed (closed) by adjusting the rotation angle range of the cam groove 109b of the diaphragm blade 109, the cam groove 110b of the diaphragm blade 110, and the drive lever 108. That is, the aperture device of the present embodiment can also be used as an aperture shutter device that also performs a shutter operation.

Further, in the above embodiment, the front lens 100 is a non-circular lens and the rear lens 104 is a circular lens, but the opposite may be true, or both may be non-circular lenses. Further, the number of lenses included in the front lens 100 and the rear lens 104 may be any number including 0, and the front lens 100 and the rear lens 104 as a whole include one or more non-circular lenses. It should be done.

The embodiments described above are merely representative examples, and various modifications and changes can be made in carrying out the present invention.

100 Front lens 101 Reflective member (bending member)
102 Ray 103 Blade drive device 104 Rear lens 105 Image sensor 106 Aperture drive unit 107 Base member (base plate)
108 Drive lever 109 Aperture blade 110 Aperture blade 111 Cover

Claims (5)

A blade drive device placed on a light beam that passes through a non-circular lens.
The main plate with the opening and
A plurality of blade members that move in the longitudinal direction of the non-circular lens and move back and forth in the opening.
It is provided with a power transmission member attached to the main plate and transmitting a driving force to the plurality of blade members.
The aperture opening formed by the plurality of blade members is such that the diameter of the non-circular lens in the direction parallel to the longitudinal direction is longer than the diameter in the direction orthogonal to the longitudinal direction in the maximum aperture open state. A featured blade drive. The blade driving device according to claim 1, wherein the engaging portion in which the plurality of blade members and the main plate engage is overlapped with the opening in the orthogonal direction when viewed in the longitudinal direction. The power transmission member has a drive lever that rotates with respect to the center of rotation.
The engaging portion is a shaft provided on one of the plurality of blade members and the main plate, and a cam groove provided on the other.
The blade drive device according to claim 2, wherein the cam groove has a curved shape in which the central portion thereof is convex toward the center of rotation. The blade driving device according to claim 3, wherein the engaging portion is provided in a region between the opening and the rotation center in the longitudinal direction. An optical device comprising the blade driving device according to any one of claims 1 to 4 and the non-circular lens.

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