JP2011158713A - Lens barrel and photographing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel capable of preventing a cam pin from coming off and dropping from a cam groove, even if a subject side front surface of a moving cylinder receives a strong impact, while maintaining miniaturization and thinning, and to provide a photographing device including such a lens barrel. <P>SOLUTION: A second rotary cylinder 160 is engaged relatively unmovably with a first rotary cylinder 140 more on the image forming side than on the moving cylinder 150 by a locking projection 1423 and a locking pawl 1612, and the position of the second rotary cylinder 160 with respect to the first rotary cylinder 140 is restricted. Further, a first cam pin 1512 provided protruding inward to the inner surface 151 of the moving cylinder 150 is inserted into a first cam groove 1421 provided on the outer surface 142 of the first rotary cylinder 140, and a second cam pin 1521 provided protruding outward to the outer surface 152 of the moving cylinder 150 is inserted into a second cam groove 1611 provided on the inner surface 161 of the second rotary cylinder 160. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel that holds a lens and can be extended and retracted, and an imaging apparatus including such a lens barrel.

  2. Description of the Related Art Conventionally, in imaging apparatuses, an imaging lens having a plurality of lenses for constituting a zoom lens has been frequently used. This point is also the case with a conventional silver salt camera for taking a picture on a conventional silver salt film. The same applies to the type of digital camera that forms an image on the imaging element and generates image data. In such a photographing apparatus, the tube length is set between the retracted state in which the lens barrel is completely or partially accommodated in the camera body and the extended state protruding from the camera body for the convenience of carrying. Some have a lens barrel that can be changed, retracted, and extended. The lens barrel is retracted and extended, for example, when the lens barrel has a cam barrel provided with a rotating cylinder that rotates about the optical axis as a rotation axis, and a cam pin that fits into the cam groove of the rotating cylinder. This is realized by including a movable cylinder whose front side protrudes from the rotating cylinder and moves in the optical axis direction according to the rotation of the rotating cylinder.

  In such a lens barrel, when the subject side front surface of the movable barrel receives an impact, the movable barrel may be deformed or displaced, and the cam pin fitted into the cam groove may fall out of the cam groove.

  As a technology to prevent the cam pin from falling out of the cam groove even if the subject side front of the moving cylinder receives an impact, there is known a technique for reinforcing the moving cylinder or parts around the moving cylinder with ribs or increasing the thickness of the parts. Yes.

  As such a drop-off prevention technique, for example, a rotating cylinder having a cam groove on the inner peripheral surface and a lens cylinder (moving cylinder) having a follower pin (cam pin) disposed inside the rotating cylinder and inserted into the cam groove. In the lens barrel in which the cam groove exerts a cam action on the follower pin (cam pin) by the rotation of the rotating cylinder and moves the lens cylinder (movable cylinder) in the optical axis direction. A convex portion that protrudes radially inward is provided, and a guide groove that receives the convex portion while allowing the lens barrel (movable barrel) to move in the optical axis direction L is provided inside the lens barrel (movable barrel). There has been proposed a lens barrel in which a restriction tube for restricting displacement or deformation of the lens tube (movable tube) is arranged (see, for example, Patent Document 1). The lens barrel rotates the regulating cylinder in conjunction with the rotating cylinder around the optical axis.

JP 2008-249982 A

  With the technology that prevents the cam pin from falling out of the cam groove even if the subject side front of the moving cylinder is impacted by reinforcing the moving cylinder or parts around the moving cylinder with ribs or increasing the thickness of the parts, There is a disadvantage that the barrel becomes larger in diameter and thicker.

  Further, according to the lens barrel proposed in Patent Document 1, even if the lens cylinder (moving cylinder) is deformed due to an impact force from the outside and the follower pin (cam pin) is about to fall out of the cam groove, the regulating cylinder Restricts the displacement or deformation of the lens cylinder (movable cylinder) via the convex portion, and the follower pin (cam pin) is prevented from falling off.

  Here, in the lens barrel proposed in Patent Document 1, the lens barrel (movable barrel) that has entered between the inner surface of the rotating barrel and the outer surface of the regulating barrel can be moved smoothly in the optical axis direction. The convex part of the cylinder (movable cylinder) and the guide groove of the regulating cylinder have a play. In this lens barrel, the regulating cylinder is rotated integrally with the rotating cylinder around the optical axis, but the regulating cylinder moves relative to the rotating cylinder in the optical axis direction. Therefore, the lens barrel (movable barrel) may not move smoothly unless a large amount of play is taken.

  In view of the above circumstances, the present invention provides a lens barrel in which a cam pin is prevented from falling out of a cam groove even when the subject-side front surface of the moving cylinder is subjected to a strong impact while maintaining a small size and a thin shape, and such a lens barrel. An object of the present invention is to provide a photographing apparatus having a simple lens barrel.

The lens barrel of the present invention that achieves the above object is
A first rotating cylinder having an outer surface provided with a first cam groove and rotating about the optical axis;
It has a first cam pin that fits into the first cam groove on the inner surface and a second cam pin on the outer surface, surrounds the outer surface of the first rotating cylinder, and the front surface on the object side protrudes from the first rotating cylinder to form an image. A moving cylinder that holds at least a part of the lenses constituting the lens and moves in the optical axis direction in accordance with the rotation of the first rotating cylinder;
A second cam groove is provided on the inner surface to receive the insertion of the second cam pin, and surrounds the outer surface of the moving cylinder and is fitted in the first rotating cylinder so as not to move relative to the imaging side of the moving cylinder. And a tube.

  Here, “relative movement impossibility” in the present invention means to rotate integrally and to move integrally in the optical axis direction.

  In the lens barrel of the present invention, the second rotary cylinder is fitted in the first rotary cylinder so that it cannot move relative to the imaging side of the movable cylinder, and the position of the second rotary cylinder relative to the first rotary cylinder is regulated. Yes. In the lens barrel of the present invention, the first cam pin is fitted in the first cam groove, and the second cam pin is fitted in the second cam groove. Therefore, according to the lens barrel of the present invention, even if the moving barrel is deformed or displaced due to an impact on the subject-side front surface of the moving barrel and the first cam pin is about to fall out of the first cam groove, the first rotation is performed. The second rotating cylinder, which is fitted to the cylinder so as not to move relative to the first rotating cylinder and restricts its position relative to the first rotating cylinder, regulates the displacement or deformation of the moving cylinder via the second cam pin. In addition, the first cam pin is reliably prevented from falling off.

Here, the lens barrel of the present invention is
“Both the first cam groove and the second cam groove have a tapered shape opened from the deep part of the cam groove toward the shallow part,
Both the first cam pin and the second cam pin have a tapered shape with a diameter narrower toward the tip side.
It is preferable.

  According to such a preferred embodiment, the first cam groove has a tapered shape that opens from the deep part to the shallow part of the cam groove, and the first cam pin that fits into the first cam groove has a diameter closer to the tip side. When the subject side front surface of the movable cylinder receives an impact, the tapered surface of the first cam pin is pressed against the tapered surface of the first cam groove, and the first cam pin of the movable cylinder is provided. A force that deforms the moving cylinder to the outside acts on the portion. On the other hand, the second cam groove has a tapered shape that opens from the deep part to the shallow part of the cam groove, and the second cam pin that fits into the second cam groove has a tapered shape with a diameter narrowing toward the tip side. Therefore, when the subject-side front surface of the moving cylinder receives an impact, the tapered surface of the second cam pin is pressed against the tapered surface of the second cam groove, and the moving cylinder is formed in the portion of the moving cylinder where the second cam pin is provided. A force that deforms inwardly acts. As a result, the force that deforms the moving cylinder to the outside and the force that deforms the moving cylinder to the inside cancel each other, and even if such forces cancel each other, the first cam pin can be prevented from falling off. Further, since the force that deforms the moving cylinder due to the impact of the front surface on the subject side of the moving cylinder is canceled, the moving cylinder can be thinned.

  In the lens barrel of the present invention, it is more preferable that the first cam pin is made of metal and at least the outer peripheral surface of the second cam pin is made of resin.

  Here, the cam pin provided on the inner surface of the cylinder is difficult to mold with a mold. According to such a preferred embodiment, the first cam pin provided on the inner surface of the moving cylinder is made of metal, and at least the outer peripheral surface of the second cam pin provided on the outer surface of the moving cylinder is made of resin. Is easy to manufacture.

Furthermore, the lens barrel of the present invention is
"The moving cylinder is provided with a first straight keyway on the inner surface,
A fixed cylinder provided with a third cam groove and a second rectilinear key groove on the inner surface;
A third rectilinear key groove is provided on the inner surface and a third cam pin is fitted on the outer surface into the third cam groove. The third cam pin is wound around the inner surface of the fixed cylinder and receives the driving force. A third rotating cylinder that moves in the optical axis direction while rotating with the optical axis as a rotation axis with respect to the fixed cylinder, along with the movement along the cam groove;
A fourth cam groove penetrating from the inner surface to the outer surface is provided, a fourth rectilinear key groove is provided on the inner surface, and a first protrusion that fits into the second rectilinear key groove is provided on the outer surface, and the inner surface of the third rotating cylinder And at least a part of the lens constituting the imaging lens is held, and with the rotation of the third rotating cylinder, it is integrated with the third rotating cylinder in the optical axis direction without rotation. A first guide tube that moves linearly;
The imaging lens has a second protrusion part that fits into the fourth rectilinear keyway on the outer surface and a third protrusion part that fits into the first rectilinear keyway, and is surrounded by the inner surface of the first rotating cylinder. A second guide cylinder that holds at least a part of the lenses, and moves integrally and linearly with the first rotary cylinder in the optical axis direction without rotation as the first rotary cylinder rotates. With
The first rotating cylinder is fitted into the fourth cam groove and protrudes outward from the fourth cam groove, and the outwardly protruding tip portion is fitted into the third rectilinear key groove. And a fourth cam pin that projects in the direction of the optical axis along the fourth cam groove while rotating integrally with the third rotating cylinder as the third rotating cylinder rotates. Yes,
The second rotating cylinder is surrounded by the inner surface of the first guiding cylinder.
This is also a preferred form.

In addition, the imaging device of the present invention that achieves the above-described object provides
A lens barrel of the present invention comprising the first rotating cylinder, the moving cylinder, and the second rotating cylinder;
A camera body equipped with an image sensor;
And an imaging lens having a lens held by the movable cylinder and a focus lens and imaging the subject on the imaging device.

  Here, the “imaging device” in the present invention refers to an image sensor such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

  The photographing apparatus of the present invention includes the lens barrel of the present invention including the first rotating cylinder, the moving cylinder, and the second rotating cylinder. Therefore, according to the photographing apparatus of the present invention, the lens barrel is provided that prevents the cam pin from falling out of the cam groove even when the subject side front surface of the movable barrel is subjected to a strong impact while maintaining a small size and a thin shape. A photographing device can be obtained.

Here, the photographing apparatus of the present invention is
“Both the first cam groove and the second cam groove have a tapered shape opened from the deep part of the cam groove toward the shallow part,
Both the first cam pin and the second cam pin have a tapered shape with a diameter narrower toward the tip side.
It is preferable.

  In the photographing apparatus of the present invention, it is further preferable that the first cam pin is made of metal and at least the outer peripheral surface of the second cam pin is made of resin.

Furthermore, the imaging device of the present invention provides:
“The camera body has the fixed cylinder fixed,
The imaging lens further includes a lens held in the first guide tube and a lens held in the second guide tube,
Instead of the lens barrel provided with the first rotating cylinder, the moving cylinder, and the second rotating cylinder, the first rotating cylinder, the moving cylinder, the second rotating cylinder, the fixed cylinder, and the third rotation. A lens barrel having a tube, the first guide tube, and the second guide tube was provided. "
This is also a preferred form.

  According to the present invention, a lens barrel in which a cam pin is prevented from falling out of a cam groove even when the subject-side front surface of the movable barrel receives a strong impact while maintaining a small size and a thin shape, and such a lens mirror. An imaging apparatus having a trunk is provided.

It is the perspective view which showed the front of the digital camera which is one Embodiment of the imaging device of this invention seeing from diagonally upward. It is the perspective view which showed the back of the digital camera which is one Embodiment of the imaging device of this invention seeing from diagonally upward. It is sectional drawing of the direction in alignment with the optical axis which shows the internal structure of the lens barrel shown in FIG. It is sectional drawing of the direction in alignment with the optical axis which shows the internal structure of the lens barrel shown in FIG. It is sectional drawing of the direction in alignment with the optical axis which shows the internal structure of the lens barrel shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 and 2 are perspective views of a digital camera 1 that is an embodiment of the photographing apparatus of the present invention, with the front and rear surfaces viewed obliquely from above.

  On the front surface of the digital camera 1, a lens barrel 100 is shown in a protruding state protruding from the camera body 10. This lens barrel 100 has an extended state shown in FIG. 1 and a retracted state (not shown) that is accommodated in the camera body 10 by contracting the tube length from the tube length in the extended state. The lens barrel 100 is an embodiment of the lens barrel of the present invention. A detailed description of the structure of the lens barrel 100 will be given later.

  The lens barrel 100 includes a zoom lens including a zoom lens that contributes to changing the focal length and a focus lens that contributes to focus adjustment. The CCD image sensor 250 (see FIGS. 3 to 5). ) Is provided with an imaging lens 200 for imaging the subject. Further, the front surface of the digital camera 1 is provided with a flash light emitting unit 11 that emits flash light at the time of shooting. The upper surface of the digital camera 1 is a half-pressed and full-pressed button that gives a shooting instruction to the digital camera 1. A shutter button 12 that can be pressed in two stages is provided.

  2 is a T / W (tele / wide) switching lever 21, a shooting / playback switching button 22, a function button 23, a four-way key 24, an OK key 25, a DISP / BACK. A key 26 and an LCD panel 27 for screen display are arranged.

  Here, the T / W switching lever 21 is a lever for switching the focal length of the imaging lens 200. The shooting / playback switching button 22 is a button for switching the mode of the digital camera 1 between a shooting mode and a playback mode each time it is pressed.

  Further, when the function button 23 is pressed, a menu is displayed on the LCD panel 27. Thereafter, the menu is switched with the left and right buttons of the four-way key 24, and any item in the menu is selected with the up and down buttons of the four-way key 24, and the OK button 25 is pressed to set the selected item. By this operation, for example, ISO sensitivity, presence / absence of flash emission, and other various items in the shooting mode or playback mode are set.

  Further, the DISP / BACK key 26 sequentially switches the display mode of images displayed on the LCD panel 27 in the playback mode (displaying only one image / displaying a plurality of thumbnail images side by side) or displaying images, for example. This key is pressed when returning to the previous screen.

  Hereinafter, the structure of the lens barrel 100 shown in FIG. 1 will be described with reference to FIGS.

  3 to 5 are cross-sectional views along the optical axis showing the internal structure of the lens barrel 100 shown in FIG. 1, and FIGS. 3 to 5 are respectively the wide end (focal length) in the extended state. Are the shortest state), the tele end (the longest focal length state) in the extended state, and the retracted state. Hereinafter, the structure of the lens barrel will be described mainly with reference to FIGS. 3 and 4 and with reference to FIG. 5 as necessary.

  The lens barrel 100 shown in FIGS. 3 to 5 is a lens barrel that can be extended and retracted. The lens barrel 100 includes a fixed barrel 110, a third rotary barrel 120, a first guide barrel 130, a first rotary barrel 140, a movable barrel 150, a second rotary barrel 160, and a second guide barrel 170. And a third guide tube 180. Further, the lens barrel 100 is fitted with a first lens 220, a second guide tube 170, and a third guide tube 180 that are held by the movable tube 150 so as not to move relative to each other as will be described later. An imaging lens 200 (see FIG. 1), which includes a second lens 230 held in the cylinder, a third lens 240 held in the first guide cylinder 130, and a focus lens 210 held in the focus lens holding frame 211. Built-in and configured to move in the direction of arrow A, which is the optical axis direction, in response to collapsing, feeding, tele / wide (T / W) switching, and focus adjustment. . Note that a zooming lens is configured by a combination of the first lens 220, the second lens 230, and the third lens 240 of the imaging lens 200 (see FIG. 1).

  The fixed cylinder 110 is provided with a third cam groove 1111 and a second rectilinear key groove 1112 on the inner surface 111. Such a fixed cylinder 110 is fixed to the base 280 in a state where movement in the direction of arrow A, which is the optical axis direction, and rotation around the optical axis are prohibited.

  Here, when the T / W switching lever 21 shown in FIG. 2 is operated, a zoom drive motor (not shown) is rotated forward or reverse depending on whether the T / W switching lever 21 is operated to the tele side or the wide side. The rotational driving force of the zoom driving motor is transmitted to the third rotating cylinder 120 via a driving gear (not shown).

  The third rotary cylinder 120 is provided with a third rectilinear key groove 1211 on the inner surface 121. The third rotating cylinder 120 is provided with a third cam pin 1221 that protrudes outward from the outer surface 122. The third cam pin 1221 is fitted in a third cam groove 1111 provided on the inner surface 111 of the fixed cylinder 110. The third rotating cylinder 120 is surrounded by the inner surface 111 of the fixed cylinder 110 and receives a driving force via a driving gear (not shown) engaged with both the third rotating cylinder 120 and a zoom driving motor (not shown). As the third cam pin 1221 moves along the third cam groove 1111, it moves in the direction of arrow A, which is the optical axis direction, while rotating with respect to the fixed cylinder 110 with the optical axis as the rotation axis.

  The first guide tube 130 is provided with a fourth cam groove 1311 penetrating from the inner surface 131 to the outer surface 132. Further, the first guide tube 130 is provided with a fourth rectilinear key groove 1312 on the inner surface 131. Furthermore, the first guide tube 130 is provided with a first protrusion 1321 protruding outward from the outer surface 132. The first protrusion 1321 is fitted in a second straight keyway 1112 provided on the inner surface 111 of the fixed cylinder 110. The first guide cylinder 130 is surrounded by the inner surface 121 of the third rotating cylinder 120, holds the third lens 240 of the lenses constituting the imaging lens 200, and rotates the third rotating cylinder 120. Along with this, the third rotating cylinder 120 moves integrally and straightly in the direction of arrow A, which is the optical axis direction, without rotation. The third lens 240 is configured to move in the direction of arrow A, which is the optical axis direction, by a third lens driving device (not shown). The third lens 240 is configured to move to a position avoiding the focus lens 210 when the extended state shown in FIGS. 3 and 4 is shifted to the retracted state shown in FIG.

  The first rotary cylinder 140 is provided with a first cam groove 1421 on the outer surface 142. The first cam groove 1421 has a tapered shape that opens from the deep part to the shallow part of the cam groove. The first rotating cylinder 140 is provided with a fourth cam pin 1422 that protrudes outward from the outer surface 142. The fourth cam pin 1422 is fitted into a fourth cam groove 1311 penetrating from the inner surface 131 to the outer surface 132 of the first guide tube 130 and protrudes outward from the fourth cam groove 1311. 1422a is fitted in a third rectilinear keyway 1211 provided on the inner surface 121 of the third rotating cylinder 120. Further, the first rotating cylinder 140 is provided with a locking projection 1423 that protrudes outward on the outer surface 142 on the image forming side with respect to the moving cylinder 150. Such a first rotating cylinder 140 is integrated with the third rotating cylinder 120 along with the rotation of the third rotating cylinder 120, while rotating around the optical axis with respect to the fixed cylinder 110 as a rotation axis. It moves along the fourth cam groove 1311 in the direction of arrow A, which is the optical axis direction.

  The moving cylinder 150 is provided with a first straight keyway 1511 on the inner surface 151. The movable cylinder 150 is provided with a first cam pin 1512 that protrudes inwardly on the inner surface 151. The first cam pin 1512 is made of metal and has a tapered shape with a diameter narrowed toward the distal end side 1512a. The first cam pin 1512 made of metal is provided by being inserted into the hole after the movable cylinder 150 is formed. The first cam pin 1512 is fitted in a first cam groove 1421 provided on the outer surface 142 of the first rotating cylinder 140. The movable cylinder 150 is provided with a second cam pin 1521 that protrudes outward from the outer surface 152. The second cam pin 1521 has a taper shape in which at least the outer peripheral surface 1521a is made of resin, and the diameter is reduced toward the distal end side 1521b. Such a moving cylinder 150 surrounds the outer surface 142 of the first rotating cylinder 140 and the subject-side front surface 150a protrudes beyond the first rotating cylinder 140, so that the first lens 220 of the lenses constituting the imaging lens 200 is disposed. As the first rotating cylinder 140 rotates, the first rotating cylinder 140 rotates and moves straight in the direction of arrow A, which is the optical axis direction, without rotation.

  The second rotary cylinder 160 is provided with a second cam groove 1611 on the inner surface 161. The second cam groove 1611 has a tapered shape that opens from the deep part to the shallow part of the cam groove. A second cam pin 1521 protruding outward from the outer surface 152 of the movable barrel 150 is fitted into the second cam groove 1611 with a slight gap. That is, the distance between the second cam pin 1521 and the second cam groove 1611 is slightly larger than the distance between the first cam pin 1512 and the first cam groove 1421. Further, the second rotating cylinder 160 is provided with a locking claw 1612 on the inner surface 161 closer to the image forming side than the moving cylinder 150. This locking claw 1612 is fitted in a locking projection 1423 provided to protrude outwardly from the outer surface 142 of the first rotating cylinder 140 on the image forming side with respect to the moving cylinder 150. Such a second rotating cylinder 160 is surrounded by the inner surface 131 of the first guide cylinder 130, and surrounds the outer surface 152 of the movable cylinder 150, and is connected to the movable cylinder 150 by the locking projection 1423 and the locking claw 1612. On the image side, the first rotary cylinder 140 is fitted so as not to be relatively movable, and moves in the direction of arrow A which is the optical axis direction while rotating integrally with the first rotary cylinder 140.

  The second guide tube 170 is provided with a second protrusion 1711 that protrudes outward from the outer surface 171. The second protrusion 1711 is fitted in a fourth rectilinear key groove 1312 provided on the inner surface 131 of the first guide tube 130. The third guide tube 180 is provided with a third protrusion 1811 that protrudes outward from the outer surface 181. The third protrusion 1811 is fitted in a first straight keyway 1511 provided on the inner surface 151 of the movable cylinder 150. The second guide tube 170 and the third guide tube 180 are fitted so as not to move relative to each other on the inner surface 131 side of the first guide tube 130. Such a tube formed by fitting the second guide tube 170 and the third guide tube 180 so as not to move relative to each other is surrounded by the inner surface 141 of the first rotating tube 140 so that the imaging lens 200 is moved. The second lens 230 of the constituting lenses is held, and the first rotary cylinder 140 is integrated and rectilinearly in the direction of the arrow A that is the optical axis direction without rotation as the first rotary cylinder 140 rotates. To move on.

  The focus lens 210 is moved in the direction of arrow A, which is the optical axis direction, by a focus lens driving device (not shown) to perform focusing.

  3 to 5 also show a CCD image sensor 250 arranged on the back surface of the focus lens 210. FIG.

  The CCD image sensor 250 is bonded and fixed to the CCD plate 270 so that the flexible substrate 260 solder-connected to the CCD image sensor 250 is sandwiched on the back side. The CCD plate 270 to which the CCD image sensor 250 is bonded and fixed is fixed to the base 280 with screws. Note that the fixed cylinder 110 is also fixed to the base 280 as described above.

  When the shutter button 12 (see FIGS. 1 and 2) is half-pressed, a focus lock that fixes the position of the focus lens 210 to the position at the time of the half-press is set, and the shutter button 12 (FIGS. 1 and 2) is set. When (see) is fully pressed, the shutter is released and actual shooting is performed. That is, the subject light that has passed through the first lens 220, the second lens 230, the third lens 240, and the focus lens 210 is incident on the CCD image sensor 250 and converted into an analog image signal that is an electrical signal. Image processing is performed by an electronic circuit that does not, and image data is recorded on a recording medium. The processing by the electronic circuit is not the subject of the present invention, but a known general technique may be applied, and thus detailed description thereof is omitted here.

  In the lens barrel 100 of the present embodiment described above, the locking claw 1612 provided on the inner surface 161 of the second rotating cylinder 160 on the image forming side with respect to the moving cylinder 150 is the moving cylinder of the first rotating cylinder 140. The engaging projection 1423 is provided so as to project outward from the outer surface 142 on the image forming side with respect to 150. That is, the second rotating cylinder 160 is fitted to the first rotating cylinder 140 so as not to move relative to the image forming side with respect to the moving cylinder 150 by the locking projection 1423 and the locking claw 1612, and the second rotating cylinder 160 The position of the rotating cylinder 160 is restricted. Further, in the lens barrel 100 of the present embodiment, a first cam pin 1512 provided to protrude inwardly on the inner surface 151 of the movable barrel 150 is a first cam groove 1421 provided on the outer surface 142 of the first rotary barrel 140. The second cam pin 1521 provided so as to protrude outwardly from the outer surface 152 of the movable barrel 150 is fitted into the second cam groove 1611 provided in the inner surface 161 of the second rotary barrel 160.

  Therefore, according to the lens barrel 100 of the present embodiment, for example, when the digital camera 1 is dropped, the subject-side front surface 150a of the moving barrel 150 receives an impact and the moving barrel 150 is deformed or displaced, and the first cam pin. Even if 1512 is about to fall out of the first cam groove 1421, the second rotary cylinder 160, which is fitted to the first rotary cylinder 140 so as not to be relatively movable and whose position relative to the first rotary cylinder 140 is regulated, pulls the second cam pin 1521. Therefore, the displacement or deformation of the movable cylinder 150 is regulated, so that the first cam pin 1512 is reliably prevented from falling off while maintaining a small size and a thin shape.

  Further, in the lens barrel 100 of the present embodiment, the first cam groove 1421 provided on the outer surface 142 of the first rotating cylinder 140 has a tapered shape that opens from the deep part of the cam groove toward the shallow part. The first cam pin 1512 that is fitted in the first cam groove 1421 and protrudes inwardly on the inner surface 151 of the moving cylinder 150 has a tapered shape with a diameter decreasing toward the tip side. When the front surface 150a receives an impact, the taper surface of the first cam pin 1512 is pressed against the taper surface of the first cam groove 1421, and the movable cylinder 150 is moved outwardly at the portion of the movable cylinder 150 where the first cam pin 1512 is provided. Deformation force acts. On the other hand, the second cam groove 1611 provided on the inner surface 161 of the second rotary cylinder 160 has a tapered shape that opens from the deep part to the shallow part of the cam groove, and moves into the second cam groove 1611. Since the second cam pin 1521 provided to protrude outwardly from the outer surface 152 of the cylinder 150 has a tapered shape with a diameter decreasing toward the distal end side, when the subject-side front surface 150a of the moving cylinder 150 receives an impact, the second cam pin 1521 has a tapered shape. The taper surface of the cam pin 1521 is pressed against the taper surface of the second cam groove 1611, and a force that deforms the movable tube 150 inwardly acts on the portion of the movable tube 150 where the second cam pin 1521 is provided. As a result, the force that deforms the moving tube 150 outwardly and the force that deforms the moving tube 150 inwardly cancel each other, and according to the lens barrel 100 of the present embodiment, such force cancels each other. This also prevents the first cam pin 1512 from falling off. Further, since the force that deforms the moving cylinder 150 due to the impact on the subject-side front surface 150a of the moving cylinder 150 is canceled, the moving cylinder 150 can be thinned.

  Here, it is difficult to form a cam pin provided on the inner surface of the cylinder so as to protrude inward. The lens barrel 100 of the present embodiment is a metal cam pin provided by inserting a first cam pin 1512 that protrudes inwardly on the inner surface 151 of the movable barrel 150 into a hole after the movable barrel 150 is formed. In addition, since at least the outer peripheral surface 1521a of the second cam pin 1521 provided to project outward from the outer surface 152 of the moving cylinder 150 is made of resin and is formed integrally with the moving cylinder 150, the manufacturing of the moving cylinder 150 is easy. is there.

  In the above-described embodiment, the example in which the photographing apparatus of the present invention is a digital camera has been described. However, the photographing apparatus of the present invention is not limited to this, for example, a silver salt camera or an instant camera. It may be.

  In the above-described embodiment, the example in which the image pickup device according to the present invention is a CCD image sensor has been described. However, the image pickup device according to the present invention is not limited to this, and for example, a CMOS image sensor or the like. It may be.

  Further, in the above-described embodiment, the example of the lens configuration including the zoom lens and the focus lens configured by the first lens, the second lens, and the third lens has been described. For example, another lens may be included.

DESCRIPTION OF SYMBOLS 1 Digital camera 10 Camera body 11 Flash generation part 12 Shutter button 21 T / W (tele / wide) switching lever 22 Shooting / playback switching button 23 Function button 24 Four-way key 25 OK key 26 DISP / BACK key 27 LCD panel 100 Lens Lens barrel 110 Fixed cylinder 111 Inner surface 1111 Third cam groove 1112 Second rectilinear keyway 120 Third rotating cylinder 121 Inner surface 1211 Third rectilinear keyway 122 Outer surface 1221 Third cam pin 130 First guide tube 131 Inner surface 132 Outer surface 1311 Fourth cam Groove 1312 Fourth straight keyway 1321 First protrusion 140 First rotating cylinder 141 Inner surface 142 Outer surface 1421 First cam groove 1422 Fourth cam pin 1422a Tip portion 1423 Locking projection 150 Moving cylinder 151 Inner surface 1511 First straight key -Groove 1512 first cam pin 1512a distal end 152 outer surface 1521 second cam pin 1521a outer peripheral surface 1521b distal end 150a subject side front 160 second rotating cylinder 161 inner surface 1611 second cam groove 1612 locking claw 170 second guide cylinder 171 outer surface 1711 first 2 projections 180 third guide tube 181 outer surface 1811 third projection 200 imaging lens 210 focus lens 211 focus lens holding frame 220 first lens 230 second lens 240 third lens 250 CCD image sensor 260 flexible substrate 270 CCD plate 280 base

Claims (8)

A first rotating cylinder having an outer surface provided with a first cam groove and rotating about the optical axis;
It has a first cam pin that fits into the first cam groove on the inner surface and a second cam pin on the outer surface, surrounds the outer surface of the first rotating cylinder, and the front surface on the subject side protrudes from the first rotating cylinder to form an image. A moving cylinder that holds at least a part of the lenses constituting the lens and moves in the optical axis direction in accordance with the rotation of the first rotating cylinder;
A second cam groove is provided on the inner surface to receive the second cam pin. The second rotation surrounds the outer surface of the moving cylinder and is fitted in the first rotating cylinder so as not to move relative to the imaging side of the moving cylinder. A lens barrel comprising a tube. Both the first cam groove and the second cam groove have a tapered shape opened from the deep part of the cam groove toward the shallow part,
2. The lens barrel according to claim 1, wherein both the first cam pin and the second cam pin have a tapered shape with a diameter decreasing toward a tip side.   The lens barrel according to claim 1 or 2, wherein the first cam pin is made of metal, and at least an outer peripheral surface of the second cam pin is made of resin. The movable cylinder is provided with a first straight keyway on the inner surface,
A fixed cylinder provided with a third cam groove and a second rectilinear key groove on the inner surface;
A third rectilinear key groove is provided on the inner surface, and a third cam pin is provided on the outer surface to be fitted into the third cam groove. The third cam pin is wound around the inner surface of the fixed cylinder and receives the driving force. A third rotating cylinder that moves in the direction of the optical axis while rotating with the optical axis as a rotation axis with respect to the fixed cylinder, along with movement along the cam groove;
A fourth cam groove penetrating from the inner surface to the outer surface is provided, a fourth rectilinear key groove is provided on the inner surface, and a first protrusion that fits into the second rectilinear key groove is provided on the outer surface, and the inner surface of the third rotating cylinder And at least a part of the lens constituting the imaging lens is held, and with the rotation of the third rotating cylinder, it is integrated with the third rotating cylinder in the optical axis direction without rotation. A first guide tube that moves linearly;
The imaging lens has a second protrusion that fits into the fourth rectilinear keyway on the outer surface and a third protrusion that fits into the first rectilinear keyway, and is surrounded by the inner surface of the first rotating cylinder. A second guide cylinder that holds at least a part of the lenses and moves integrally and linearly with the first rotary cylinder in the optical axis direction without rotation as the first rotary cylinder rotates. With
The first rotating cylinder is fitted into the fourth cam groove and protrudes outward from the fourth cam groove, and the tip portion protruding outward is fitted into the third rectilinear key groove. And a fourth cam pin that projects in the direction of the optical axis along the fourth cam groove while rotating integrally with the third rotary cylinder as the third rotary cylinder rotates. Yes,
4. The lens barrel according to claim 1, wherein the second rotating cylinder is wound around the inner surface of the first guide cylinder. 5. A lens barrel according to claim 1;
A camera body equipped with an image sensor;
An imaging apparatus comprising: a lens held by the movable cylinder; and an imaging lens that forms an image of a subject on the imaging device, the lens having a focus lens. Both the first cam groove and the second cam groove have a tapered shape opened from the deep part of the cam groove toward the shallow part,
6. The photographing apparatus according to claim 5, wherein both of the first cam pin and the second cam pin have a tapered shape with a diameter decreasing toward a tip end side.   The photographing apparatus according to claim 5 or 6, wherein the first cam pin is made of metal, and at least an outer peripheral surface of the second cam pin is made of resin. The camera body has the fixed cylinder fixed thereto;
The imaging lens further includes a lens held by the first guide tube and a lens held by the second guide tube,
8. The photographing apparatus according to claim 5, further comprising the lens barrel according to claim 4 instead of the lens barrel according to claim 1.

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