JP2011138076A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To house a first lens group in a compact state, to reduce the number of assembling steps, and achieve high optical accuracy after assembling. <P>SOLUTION: The lens barrel is equipped with: a first lens frame 53 configured to hold the first lens group 21; a first moving frame 54 configured to move the first lens frame 53 between a photographing position and a housing position; a position adjusting spring 52 configured to energize the first lens frame 53 toward the first moving frame 54; a guide ring 51 which is rotatable with respect to the first moving frame 54; and a second lens frame configured to hold the second lens group located behind the first lens group 21. The first lens frame 53 is disposed so that the position thereof in the direction of an optical axis 20a is adjusted by changing the contact position with the first moving frame 54 with the rotation of the guide ring 51, and so as to prevent the first lens group 21 and the second lens group from coming into contact with each other in the housing position, the second lens frame is disposed so that the first lens frame 53 and the first moving frame 54 are separated from each other against the energizing of the position adjusting spring 52. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus in which a first imaging lens arranged closest to the object side can be moved between an imaging position on the object side and a storage position.

  2. Description of the Related Art Conventionally, an imaging apparatus such as a digital video camera or a digital still camera forms a subject image with an imaging lens, and a CCD (Charge Coupled Device Image Sensor) image sensor or a CMOS (Complementary Metal Oxide) disposed at the rear of the imaging lens. Semiconductor) A subject image is captured by an image sensor such as an image sensor. In order to reduce the size of the imaging apparatus, a lens barrel is known in which a lens group including a plurality of imaging lenses can be moved between an imaging position on the object side and a storage position.

  Here, in the case of a lens barrel in which two or more lens groups can move between the photographing position and the storage position, when the lens barrel is retracted and the front and rear lens groups are moved to the respective storage positions, the lens groups are stored. It is necessary to prevent the imaging lenses of the front and rear lens groups in position from contacting each other. For this reason, it is necessary to form a certain gap between the front and rear lens groups at the storage position.

  Further, when the lens group is attached to the support frame, it is necessary to adjust the attachment positions of some lens groups and the support frame in the optical axis direction. Therefore, it is necessary to provide a margin space for adjustment between the storage position of the lens group and the storage position of the adjacent lens group by the adjustment size of the lens group.

  As described above, since it is necessary to avoid contact between the lens groups and to provide a margin space for adjusting the lens groups, it is difficult for the conventional lens barrel to store the front and rear lens groups in a compact manner.

  Therefore, the first lens frame is screwed onto the moving frame and attached, and the position of the first imaging lens in the optical axis direction is adjusted by adjusting the screwing position of the first lens frame with respect to the moving frame during assembly adjustment. A technique that enables adjustment is known. Then, regardless of the adjustment position in the optical axis direction, the first lens frame and the second lens frame are mechanically brought into contact with each other without bringing the first imaging lens and the second imaging lens into contact at the storage position. The first imaging lens can be stored in a compact manner.

JP 2002-286888 A

  However, in the technique of the above-mentioned Patent Document 1, since the first lens frame is screwed to the moving frame, tilt and play due to play of the screw fitting portion are generated, and a decrease in optical accuracy is inevitable. Further, there is a problem that the adjustment of the screwing position causes an increase in assembly man-hours.

  Accordingly, the problem to be solved by the present invention is to reduce the number of assembling steps and to obtain high optical accuracy after assembling, while enabling compact storage of the first imaging lens.

The present invention solves the above-described problems by the following means.
According to the first aspect of the present invention, a first imaging lens disposed on the object side in the optical axis direction, a first lens frame that holds the first imaging lens, and an imaging position on the object side of the first lens frame And a storage frame that is in contact with the first lens frame at the photographing position, and the first lens frame is biased toward the moving frame. A position adjustment spring, a guide ring that holds the position adjustment spring and is relatively rotatable with respect to the moving frame, and a second that is arranged behind the first imaging lens in the optical axis direction An image pickup lens; and a second lens frame that holds the second image pickup lens. The moving position of the first lens frame is changed when the position of contact with the moving frame is changed by rotation of the guide ring. Adjustable optical axis position with respect to The second lens frame is provided with the first imaging lens and the second imaging when the first lens frame is moved to the storage position by movement of the moving frame regardless of the adjustment position of the first lens frame. It is a lens barrel provided so as to separate the first lens frame and the moving frame against the bias of the position adjusting spring so that the lens does not contact.

  The invention according to claim 5 is the same as the first image pickup lens, the first lens frame, the moving frame, the position adjustment spring, the guide ring, the second image pickup lens, and the second lens as the invention according to claim 1. It is an imaging device provided with a frame.

(Function)
In the first and fifth aspects of the present invention, the contact position between the first lens frame and the moving frame is changed by the rotation of the guide ring, and the position of the first lens frame in the optical axis direction with respect to the moving frame is changed. Adjusted. Therefore, the first lens frame is reliably positioned by contact with the moving frame. Further, the second lens frame acts so as to separate the first lens frame and the moving frame at the storage position regardless of the adjustment position of the first lens frame. Avoid contact.

  According to the present invention, the contact position between the first lens frame and the moving frame is changed by simply rotating the guide ring, and the first lens frame is positioned by the contact, so that the assembly of the first lens frame is possible. It becomes simple and high optical accuracy can be obtained even after assembly. In addition, the first imaging lens can be compactly accommodated without the first imaging lens and the second imaging lens being in contact with each other even in the storage position.

It is a front view which shows the structure of the digital still camera as one Embodiment of the imaging device of this invention. FIGS. 2A and 2B are a perspective view and a sectional view showing a lens barrel of the digital still camera shown in FIG. It is the perspective view and sectional drawing which show the lens barrel of the digital still camera shown in FIG. 1, and shows the pay-out state at the time of tele photography. It is sectional drawing which expands and shows the A section (contact part of a 1st lens frame and a 1st moving frame) of the lens barrel shown in FIG.2 and FIG.3. It is the perspective view and sectional drawing which show the lens barrel of the digital still camera shown in FIG. 1, and shows the retracted state at the time of non-photographing. FIG. 6 is an enlarged cross-sectional view showing a B portion (a contact portion between the first lens frame and the first moving frame) of the lens barrel shown in FIG. 5. 1 is an exploded perspective view showing a main part of a lens barrel (first embodiment) for a digital still camera as an embodiment of a lens barrel of the present invention. FIG. 8 is a perspective view showing a guide ring of the lens barrel shown in FIG. 7. FIG. 8 is a perspective view showing a first lens frame of the lens barrel shown in FIG. 7. FIG. 8 is a perspective view showing a first moving frame of the lens barrel shown in FIG. 7. FIG. 8 is a perspective view showing a second moving frame of the lens barrel shown in FIG. 7. FIG. 2 is a front view and a cross-sectional view showing an initial stage of position adjustment of a first lens frame in a lens barrel (first embodiment) for a digital still camera as an embodiment of a lens barrel of the present invention. . 1 is a front view and a cross-sectional view showing an example (one example) of position adjustment of a first lens frame in a lens barrel (first embodiment) for a digital still camera as one embodiment of a lens barrel of the present invention. It is. The front view which shows the position adjustment example (other example) of the 1st lens frame in the lens barrel (1st Embodiment) for digital still cameras as one Embodiment of the lens barrel of this invention, It is sectional drawing. It is sectional drawing which shows the position adjustment example (2 examples) of a 1st lens frame in the lens barrel (2nd Embodiment) for digital still cameras as one Embodiment of the lens barrel of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Here, the imaging device according to the present invention is assumed to be a digital still camera 10 in the following embodiments. The lens barrel in the present invention is assumed to be the lens barrel 20 for the digital still camera 10 in the following embodiments.
The description will be given in the following order:

1. First embodiment (lens barrel: configuration example of first lens frame and first moving frame)
2. Second embodiment (lens barrel: other configuration examples of the first lens frame and the first moving frame)

[External appearance of imaging device]

FIG. 1 is a front view showing a configuration of a digital still camera 10 as an embodiment of an imaging apparatus of the present invention.
As shown in FIG. 1, the digital still camera 10 includes a rectangular parallelepiped body 11 constituting an exterior. A lens barrel 20 is incorporated on the right side of the body 11. In the non-photographing state shown in FIG. 1, the front side of the lens barrel 20 is covered with the barrier unit 40.
In the digital still camera 10 shown in FIG. 1, the left and right refer to the left and right viewed from the front side shown in FIG.

  Further, for example, a strobe light emitting unit 12 is built in the upper left of the lens barrel 20, and for example, a switch unit 13 is built in the left of the strobe light emitting unit 12. Furthermore, on the right side of the lens barrel 20, for example, an AF (Auto Focus) auxiliary light unit 14 is incorporated, and on the left side of the lens barrel 20, for example, a battery 15 is incorporated. Furthermore, for example, a condenser microphone 16 is incorporated in the lower right of the lens barrel 20.

[External appearance of lens barrel]

2A and 2B are a perspective view and a cross-sectional view showing the lens barrel 20 of the digital still camera 10 shown in FIG.
FIG. 3 is a perspective view and a cross-sectional view showing the lens barrel 20 of the digital still camera 10 shown in FIG. 1, and shows the extended state during telephotographing.
FIG. 4 is an enlarged cross-sectional view showing a portion A of the lens barrel shown in FIGS. 2 and 3 (a contact portion between the first lens frame 53 and the first moving frame 54).
As shown in FIGS. 2 and 3, the imaging optical system of the lens barrel 20 includes a first lens group 21 (corresponding to the first imaging lens in the present invention) and a second lens arranged in order from the object (subject) side. A group 22 (corresponding to the second imaging lens in the present invention), an automatic exposure device 24, a third lens group 23, and an imaging element 25 are configured.
For example, a CCD image sensor or a CMOS image sensor is used as the image sensor 25.

Here, the first lens group 21 arranged on the most object side in the direction of the optical axis 20 a is held by the first lens frame 53. The first lens frame 53 can be moved between an object-side shooting position and a storage position behind the shooting position in the optical axis 20a direction by a first moving frame 54 (corresponding to the moving frame in the present invention). It has become. 2 and 3, the first lens group 21 (first lens frame 53) is extended by the first moving frame 54 with respect to the image sensor 25 fixed in the direction of the optical axis 20a. Move to the shooting position on the side.
At this time, the barrier unit 40 operates so as to open, and the front side of the first lens group 21 is opened.

  Further, as shown in FIG. 4, the first lens frame 53 is urged toward the first moving frame 54 by a position adjusting spring 52 held by the guide ring 51. Then, at the photographing position of the first lens frame 53 (see FIGS. 2 and 3), the first lens frame 53 contacts the stepped portion 54 c of the first moving frame 54. Therefore, the first lens frame 53 (first lens group 21) is positioned at the contact position (the upper surface of the stepped portion 54c).

  2 and 3, the second lens group 22 disposed behind the first lens group 21 in the optical axis 20a direction is a second moving frame 55 (corresponding to the second lens frame in the present invention). ). Therefore, the second lens group 22 is held by the second moving frame 55 and is movable in the direction of the optical axis 20a. Thereby, at the time of photographing, the zooming operation of the optical system can be performed by moving the second lens group 22 by a predetermined amount with respect to the first lens group 21 at the photographing position. Then, the wide shooting state shown in FIG. 2 and the tele shooting state shown in FIG. 3 are obtained.

  The automatic exposure device 24 is a light amount adjustment device having a shutter function and an iris function. The automatic exposure device 24 is held so as to be relatively movable in the direction of the optical axis 20a and is urged in a direction away from the second lens group 22 by a spring 26. ing. 2 and 3, the automatic exposure device 24 and the second lens group 22 are moved relative to each other in the direction of the optical axis 20 a by the bias of the spring 26. Therefore, the second lens group 22 is retracted from the opening of the automatic exposure device 24.

Furthermore, the third lens group 23 is also movable in the direction of the optical axis 20a. Then, the focusing operation of the optical system can be performed by moving the third lens group 23 by a predetermined amount.
The first lens group 21 is extended, the zooming operation by moving the second lens group 22 and the opening / closing of the barrier unit 40 are performed by driving one drive motor (not shown). The focusing operation by movement is performed by driving another drive motor (not shown).

FIG. 5 is a perspective view and a cross-sectional view showing the lens barrel 20 of the digital still camera 10 shown in FIG. 1, and shows a retracted state when not photographing.
FIG. 6 is an enlarged cross-sectional view showing a B portion (a contact portion between the first lens frame 53 and the first moving frame 54) of the lens barrel 20 shown in FIG.
As shown in FIG. 5, the lens barrel 20 is a retractable type. Specifically, at the time of non-photographing shown in FIG. 5, the first moving frame 54 and the second moving frame 55 move to change the retracted state from the extended state at the time of photographing shown in FIGS.

  In the retracted state, the first lens frame 53 (first lens group 21) moves to the storage position behind the photographing position in the optical axis 20a direction, but the first lens frame 53 of the second moving frame 55 is moved to the storage position. It contacts the protrusion 55a. Therefore, the first lens frame 53 is separated from the stepped portion 54c of the first moving frame 54 against the bias of the position adjusting spring 52 as shown in FIG. Thereby, even if the first lens frame 53 is moved to the storage position (see FIG. 5), the contact between the first lens group 21 and the second lens group 22 is avoided, and the first lens group 21 is compactly stored. Is possible.

Further, at the time of non-photographing shown in FIG. 5, a part of the second lens group 22 is accommodated in the opening of the automatic exposure device 24. For this reason, the distance between the second lens group 22 and the third lens group 23 is reduced, and the lens barrel 20 at the time of non-photographing is also made compact.
Note that the front side of the first lens group 21 is protected by the barrier unit 40 during non-photographing.

[Configuration example of lens barrel]

FIG. 7 is an exploded perspective view showing a main part of a lens barrel 20 (first embodiment) for a digital still camera as an embodiment of the lens barrel of the present invention.
As shown in FIG. 7, the lens barrel 20 includes, in order from the subject side, a makeup ring 31, a barrier unit 40, a guide ring 51, a position adjustment spring 52, a first lens frame 53 that holds the first lens group 21, and a first lens frame 53. A first moving frame 54 that moves one lens frame 53, a second moving frame 55 that moves while holding the second lens group 22, a rectilinear guide ring 56, a rotating ring 57, a fixed ring 32, a rear barrel 33, and the like. I have.
In FIG. 7, the illustration of the third lens group 23 and the like shown in FIGS. 2, 3, and 5 is omitted for convenience of explanation.

Here, the decorative ring 31 is fixed to the first moving frame 54 to adjust the appearance of the lens barrel 20, and the barrier unit 40 including the barrier cover 41, the barrier blade 42, the barrier drive spring 43, and the barrier drive member 44. Protect. The decorative ring 31 is fixed by affixing a double-faced tape with release paper on the front surface of the barrier cover 41 fixed to the first moving frame 54, peeling the release paper, and then covering the decorative ring 31 on the first moving frame 54. By doing. And it is firmly fixed to the 1st movement frame 54 via the barrier cover 41 with the adhesive force of a double-sided tape.
In addition, as a material of the decorative ring 31, various metals, such as an aluminum alloy and stainless steel, are suitable, but engineering plastics can also be used.

  The barrier unit 40 protects the photographing optical system by closing an optical path that is a photographing aperture when not photographing. Specifically, the barrier cover 41 disposed at the front portion of the first lens group 21 is formed with a photographing opening 41a for allowing light to enter the first lens group 21 and the like. The barrier driving spring 43 attached between the barrier cover 41 and the barrier blade 42 and the barrier driving member 44 constitute an opening / closing mechanism for the barrier blade 42.

  In such a barrier unit 40, the barrier driving member 44 drives the barrier blades 42 to open and close in accordance with switching between the photographing position and the storage position of the first lens frame 53 (first lens group 21). For example, when the first lens frame 53 is set to the photographing position (see FIG. 2), the barrier driving member 44 rotates in the direction of the arrow B to open the barrier blade 42 and open the opening 41a of the barrier cover 41 to open the first lens group. Light is incident on 21 etc. Conversely, when the first lens frame 53 is set to the storage position (see FIG. 5), the barrier driving member 44 rotates in the direction of the arrow A to close the barrier blade 42 and close the opening 41a of the barrier cover 41 to close the first lens. Group 21 is protected.

  The first lens group 21 is held by the first lens frame 53. The first lens frame 53 is urged toward the first moving frame 54 by a position adjusting spring 52 interposed between the guide ring 51 and the first lens frame 53. Specifically, the position adjustment spring 52 is held by the guide ring 51. Furthermore, the guide ring 51 can be rotated with respect to the first moving frame 54 by fitting the bayonet to the first moving frame 54, but is fixed in the direction of the optical axis 20a. Therefore, the first lens frame 53 is positioned between the guide ring 51 and the first moving frame 54 and abuts on the first moving frame 54 by the bias of the position adjustment spring 52.

  The second lens group 22 is disposed behind the first lens group 21 in the optical axis 20a direction and is held by the second moving frame 55. Each of the first moving frame 54 and the second moving frame 55 is provided with three cam pins, and the three cams provided on the inner peripheral side of the rotating ring 57 that can rotate around the optical axis 20a. Each is engaged with a groove. Further, the first moving frame 54 and the second moving frame 55 are also engaged with the rectilinear grooves of the rectilinear guide ring 56 so that they are not simultaneously rotated by the rotation of the rotating ring 57.

  Here, the rotation ring 57 and the rectilinear guide ring 56 can be moved in a straight line by bayonet fitting so that the rectilinear guide ring 56 is not restricted with respect to the rotation of the rotation ring 57. Further, with respect to the movement of the rotating ring 57 in the direction of the optical axis 20a, the linear guide ring 56 also moves together. Specifically, three cam pins are provided on the rotating ring 57 and are respectively fitted with three cam grooves provided on the inner peripheral side of the fixed ring 32. As the rotating ring 57 rotates with respect to the fixed ring 32, the rotating ring 57 moves in the direction of the optical axis 20a along the locus of the cam groove of the fixed ring 32. Further, the straight guide ring 56 is provided with five convex portions for fitting with the fixed ring 32, and the five convex portions and the five straight grooves provided on the fixed ring 32 are respectively provided. Mating. Therefore, the linear guide ring 56 can only move in the direction of the optical axis 20a with respect to the fixed ring 32, and movement in the rotational direction is restricted.

Therefore, when the rotating ring 57 is rotated, the rotating ring 57 moves in the direction of the optical axis 20 a while rotating with respect to the fixed ring 32. Further, the linear guide ring 56 moves in the direction of the optical axis 20a integrally with the rotary ring 57 without rotating. Furthermore, the first moving frame 54 and the second moving frame 55 move in the direction of the optical axis 20a along the cam groove of the rotating ring 57 without rotating. As a result, the first moving frame 54 moves in the direction of the optical axis 20a according to the rotation of the rotating ring 57 and its position, and retracts or extends. Further, the second moving frame 55 moves in the direction of the optical axis 20a in accordance with the rotation of the rotating ring 57 and its position to realize zooming (wide shooting or tele shooting).
When the rotating ring 57 is rotated in one direction, the first moving frame 54 is first extended from the retracted position, and then the second moving frame 55 is moved from the retracted position to the tele end via the wide end. Conversely, when the rotating ring 57 is rotated in the opposite direction, the second moving frame 55 first retracts from the tele end via the wide end, and then the first moving frame 54 retracts from the extended position.

  The stationary ring 32 is held by the rear barrel 33, and the rear barrel 33 has a cam surface 33a. The cam surface 33 a abuts on the cam surface 44 a formed on the barrier drive member 44. When the distance from the rear barrel 33 is reduced by the movement of the first moving frame 54, the barrier drive member 44 is gradually charged by the contact between the cam surface 33a and the cam surface 44a while the barrier drive spring 43 is gradually charged. It rotates in the direction of arrow A, and the barrier blade 42 is closed. On the contrary, when the distance from the rear barrel 33 is increased by the movement of the first moving frame 54, the cam surface 33a and the cam surface 44a are separated from each other, so that the charge of the barrier drive spring 43 is gradually released and the barrier drive member is released. 44 rotates in the direction of arrow B to open the barrier blade 42.

As described above, the first moving frame 54 is extended or retracted according to the rotation and the position of the rotating ring 57 to open and close the barrier blades 42. Further, the second moving frame 55 moves in the tele direction or the wide direction according to the rotation of the rotating ring 57 and its position, and a zooming operation is performed. Therefore, a gear train is formed on the outer peripheral surface of the rotary ring 57, and the rotary ring 57 is rotated by driving of a drive motor (not shown) fixed between the fixed ring 32 and the rear barrel 33. It is supposed to be.
The rotational driving force of the drive motor is transmitted by a reduction drive unit that rotates the rotary ring 57 via a plurality of reduction gears.

<1. First Embodiment>
[Configuration example of the first lens frame and the first moving frame in the lens barrel]

FIG. 8 is a perspective view showing the guide ring 51 of the lens barrel 20 shown in FIG.
FIG. 9 is a perspective view showing the first lens frame 53 of the lens barrel 20 shown in FIG.
Furthermore, FIG. 10 is a perspective view showing the first moving frame 54 of the lens barrel 20 shown in FIG.
Further, FIG. 11 is a perspective view showing the second moving frame 55 of the lens barrel 20 shown in FIG.
Here, the guide ring 51 shown in FIG. 8 and the first lens frame 53 (upper side shown in FIG. 9) shown in FIG. 9 are arranged to face each other, and the first lens frame 53 shown in FIG. ) And the first moving frame 54 shown in FIG. The second moving frame 55 shown in FIG. 11 is arranged so as to face the first lens frame 53 (the side shown in the lower diagram) shown in FIG. 9 via the first moving frame 54 shown in FIG.

  As shown in FIG. 8, the guide ring 51 has a spring holding portion 51a for holding the position adjustment spring 52 (see FIG. 7) on the first lens frame 53 (see FIG. 7) side. As shown in the upper diagram of FIG. 9, the first lens frame 53 has a spring holding boss 53a for holding the position adjustment spring 52 on the guide ring 51 (see FIG. 7) side. Therefore, the position adjustment spring 52 is held between the guide ring 51 and the first lens frame 53.

As shown in FIG. 8, the guide ring 51 has a guide groove 51b (corresponding to the holding portion in the present invention). As shown in FIG. 9, the first lens frame 53 is formed in the guide groove 51b. It has a corresponding flange 53b. The flange 53b is fitted in the guide groove 51b. Therefore, the guide ring 51 holds the first lens frame 53 so as to be movable in the direction of the optical axis 20a (see FIG. 7) and immovable in the rotational direction.
Since the guide groove 51b and the flange 53b are arranged at equal intervals of an angle of 120 °, they can be fitted even when their phases are rotated by 120 °.

  Furthermore, as shown in FIG. 8, the guide ring 51 has a bayonet groove 51c and a rotation restricting projection 51d. Furthermore, as shown in FIG. 10, the first moving frame 54 includes a bayonet claw 54a for bayonet fitting the guide ring 51, and a rotation positioning recess 54b provided on the inner periphery corresponding to the rotation restricting projection 51d. have. Therefore, if the guide ring 51 is rotated after the bayonet groove 51c is inserted into the bayonet claw 54a, the guide ring 51 is directed to the first moving frame 54 in the direction of the optical axis 20a (see FIG. 7) by bayonet fitting. It is attached to be rotatable while being regulated.

The attached guide ring 51 is controlled in free rotation and rotational position by fitting the rotation restricting protrusion 51d and the rotation positioning recess 54b. Further, when the guide ring 51 is attached to the first moving frame 54, the first lens frame 53 (see FIG. 9) is urged toward the first moving frame 54 by the position adjusting spring 52 (see FIG. 7). The
The first moving frame 54 has a mounting recess 54e and a stopper 54f for the convenience of mounting the guide ring 51 and the like. Moreover, the guide ring 51 and the 1st moving frame 54 should just be able to rotate relatively.

  Here, as shown in the lower part of FIG. 9, the first lens frame 53 includes a contact portion 53c with the first moving frame 54 on the first moving frame 54 side of the flange 53b. A correction portion 53 d is formed on the outer peripheral surface of the first lens frame 53. Furthermore, as shown in FIG. 10, the first moving frame 54 is formed so as to be able to come into contact with the contact portion 53c (see FIG. 9) of the first lens frame 53, and in the direction of the optical axis 20a (see FIG. 7). A stepped portion 54c having a step is provided. Further, the first moving frame 54 has a correcting unit 54d corresponding to the correcting unit 53d (see FIG. 9) of the first lens frame 53.

Therefore, when the first lens frame 53 (first lens group 21) shown in FIG. 9 is in the photographing position due to the movement of the first moving frame 54, the first adjustment is performed by the bias of the position adjustment spring 52 (see FIG. 7). The contact portion 53c of the lens frame 53 and the stepped portion 54c of the first moving frame 54 contact each other. Then, the direction of the optical axis 20a of the first lens frame 53 is positioned (see FIG. 4).
The radial direction is determined by always fitting the correction unit 53d of the first lens frame 53 and the correction unit 54d of the first moving frame 54.

  Further, since the rotation of the first lens frame 53 is restricted by the guide ring 51 (see FIG. 8), when the guide ring 51 is rotated, the first lens frame 53 is also rotated at the same time. At this time, the contact portion 53c of the first lens frame 53 moves up and down the stepped portion 54c of the first moving frame 54, and the contact position changes. Therefore, the position of the first lens frame 53 with respect to the first moving frame 54 in the direction of the optical axis 20a (see FIG. 7) can be adjusted.

Furthermore, as shown in the lower diagram of FIG. 9, the first lens frame 53 has a back seat 53e on the first moving frame 54 side, and as shown in FIG. It has a protrusion 55a. Regardless of the adjustment position of the first lens frame 53 (the contact position between the contact portion 53c of the first lens frame 53 and the stepped portion 54c of the first movement frame 54 shown in FIG. 10), the first movement frame. When the first lens frame 53 (first lens group 21) is moved to the storage position by the movement of 54, the protrusion 55a presses the back seat 53e. Therefore, the protrusion 55a separates the first lens frame 53 and the first moving frame 54 against the bias of the position adjustment spring 52 (see FIG. 6). Therefore, as shown in FIG. 5, the first lens group 21 and the second lens group 22 do not come into contact with each other even when the first lens frame 53 is in the storage position. As a result, the first lens frame 53 can be stored compactly without providing a margin space for position adjustment of the first lens frame 53.
Next, the procedure and method for assembling and adjusting the position of the first lens frame 53 will be described.

FIG. 12 is a front view showing an initial stage of position adjustment of the first lens frame 53 in the lens barrel 20 for the digital still camera (first embodiment) as one embodiment of the lens barrel of the present invention. It is a figure and sectional drawing.
FIG. 13 shows an example of position adjustment of the first lens frame 53 in the lens barrel 20 (first embodiment) for a digital still camera as one embodiment of the lens barrel of the present invention (one example). FIG.
Further, FIG. 14 shows an example of position adjustment of the first lens frame 53 (others) in the lens barrel 20 for the digital still camera (first embodiment) as one embodiment of the lens barrel of the present invention. It is the front view and sectional drawing which show 1 example of these.
Here, the first lens frame 53 holds the first lens group 21, and by rotating the guide ring 51, the first lens frame 53 (first lens group 21) and the guide ring 51 are integrated. Rotate.

  The first lens frame 53 is assembled by first attaching the contact portion 53c formed on one surface of the flange 53b of the first lens frame 53 to the first moving frame 54, as shown in the lower diagram of FIG. Align and insert into the recess 54e. Next, the position adjustment spring 52 is mounted between the spring holding boss 53 a formed on the opposite surface of the flange 53 b of the first lens frame 53 and the spring holding portion 51 a of the guide ring 51. Then, the bayonet phases of the guide ring 51 and the first moving frame 54 are matched, and the guide ring 51 is inserted into the first moving frame 54.

  Thereafter, if the guide ring 51 is rotated counterclockwise from the state shown in FIG. 12 (attachment position of the first lens frame 53), the position of the first lens frame 53 in the direction of the optical axis 20a depends on the rotation position. Adjusted. For example, as shown in FIG. 13, it is assumed that the guide ring 51 is rotated by two rotation positioning recesses 54 b of the first moving frame 54. In this case, the contact portion 53c of the first lens frame 53 rises two steps above the stepped portion 54c of the first moving frame 54, and the distance between the guide ring 51 and the first lens frame 53 is the second step of the stepped portion 54c. Narrows according to height.

Similarly, when the guide ring 51 is rotated counterclockwise from the state shown in FIG. 12 and moved by six rotation positioning recesses 54b of the first moving frame 54 as shown in FIG. The abutting portion 53 c of 53 moves to the sixth step of the stepped portion 54 c of the first moving frame 54. Therefore, the position of the first lens frame 53 is adjusted so that it is closer to the guide ring 51 than in the state shown in FIG.
Since the first lens frame 53 is biased toward the first moving frame 54 by the position adjustment spring 52, the abutment portion 53c is placed on the step portion 54c at any step of the step portion 54c. Abut.

  Thus, in the first embodiment, the first moving frame 54 is provided with the six-step staircase portion 54c, and the position of the first lens frame 53 in the direction of the optical axis 20a can be adjusted in six steps. The guide ring 51 has a stopper 51e that comes into contact with a bayonet claw 54a provided on the first moving frame 54. The first moving frame 54 comes into contact with a flange 53b of the first lens frame 53. have. Therefore, even if the guide ring 51 is rotated counterclockwise beyond the state shown in FIG. 14 (the final adjustment position of the first lens frame 53), the stopper 51e contacts the bayonet claw 54a of the first moving frame 54. Rotation is regulated.

  On the other hand, when the guide ring 51 is to be rotated clockwise from the state shown in FIG. 12 (attachment position of the first lens frame 53), the flange 53b of the first lens frame 53 that rotates together with the guide ring 51 is used. Comes into contact with the stopper 54f of the first moving frame 54 and its rotation is restricted. Therefore, the rotation range of the guide ring 51 is between the mounting position of the first lens frame 53 (the state of FIG. 12) in the first moving frame 54 and the sixth stage position (the state of FIG. 14) of the stepped portion 54c. It will be regulated. As a result, unnecessary rotation of the guide ring 51 is prevented and adjustment workability is improved.

<2. Second Embodiment>
[Another configuration example of the first lens frame and the first moving frame in the lens barrel]

FIG. 15 shows examples (2 examples) of position adjustment of the first lens frame 63 in the lens barrel 20 for the digital still camera (second embodiment) as an embodiment of the lens barrel of the present invention. It is sectional drawing shown.
As shown in FIG. 15, the first moving frame 64 of the second embodiment includes a contact portion 64 c that contacts the first lens frame 63. The first lens frame 63 is formed so as to be able to come into contact with the contact portion 64c of the first moving frame 64, and includes a stepped portion 63c having five steps in the direction of the optical axis 20a.
In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment.

  The second embodiment shown in FIG. 15 has a configuration in which a staircase portion and an abutting portion are provided opposite to the first embodiment shown in FIGS. Even in the second embodiment, the first lens frame 63 is moved first by the position adjustment spring 52 inserted between the spring holding boss 63a and the spring holding portion 51a of the guide ring 51. It is urged toward the frame 64. Then, by rotating the guide ring 51, the contact position between the stepped portion 63c of the first lens frame 63 and the contact portion 64c of the first moving frame 64 changes. Therefore, the position of the first lens frame 63 in the optical axis 20a direction with respect to the first moving frame 64 is adjusted.

  Also, regardless of the adjustment position of the first lens frame 63, when the first lens frame 63 is brought into the storage position by the movement of the first movement frame 64, it is the same as in the case of the first embodiment shown in FIG. The protrusion 55 a of the second moving frame 55 contacts the first lens frame 63. Therefore, similarly to the first lens frame 53 shown in FIG. 6, the first lens frame 63 is lifted against the bias of the position adjustment spring 52 by the projection 55 a. Therefore, the first lens group 21 and the second lens group 22 do not come into contact with each other, and the first lens group 21 can be stored in a compact manner.

  Thus, according to the embodiment (the first embodiment and the second embodiment), the first lens frame 53 (or the first lens frame 63) is replaced by the first moving frame 54 (or the first moving frame). 64) is mechanically shifted to adjust the position in the direction of the optical axis 20a. Therefore, high optical accuracy is ensured, and the number of assembling steps and costs can be reduced. Further, the compact storage of the first lens group 21 makes it possible to reduce the size of the lens barrel 20.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The following various deformation | transformation are possible. For example,
(1) In the embodiment, the digital still camera 10 is taken as an example of the imaging device. However, the present invention is not limited to this, and can be widely applied to imaging devices such as digital video cameras and camera-equipped mobile phones.

  (2) In the embodiment, the first moving frame 54 (or the first lens frame 63) is provided with the stepped portion 54c (or the stepped portion 63c), and the first lens frame 53 (or the first lens frame 63) has six steps ( Alternatively, the position of 5 stages) can be adjusted. However, the number of steps is not limited to this, and the number of steps may be any number. Moreover, if the contact position of a 1st moving frame and a 1st lens frame changes, it will not be restricted to a staircase part.

  (3) In the embodiment, the second lens group 22 that holds the second lens group 22 is the second moving frame 55 so that the second lens group 22 can be moved in the direction of the optical axis 20a. The lens (second lens group) may be fixed. In the embodiment, the first moving frame 54 and the second moving frame 55 are moved by the rotation of the rotating ring 57, and the rotating ring 57 rotates around the optical axis 20a and in the direction of the optical axis 20a. Move to. However, the axis of rotation center of the rotating ring may not coincide with the optical axis, and the rotating ring may not move in the optical axis direction.

  (4) In the embodiment, the relationship between the first lens group 21 and the second lens group 22 is given as an example. However, the present invention is not limited to this, and when there are two or more imaging lenses, Widely applicable to relationship. In the embodiment, the second lens group 22 is fixedly held by the second moving frame 55, but may be movable in a direction perpendicular to the optical axis 20a in order to realize a camera shake prevention function. For example, the second lens group may be held by the second moving frame via a second lens frame that is held so as to be movable in a direction perpendicular to the optical axis with respect to the second moving frame.

10 Digital still camera (imaging device)
20 lens barrel 20a optical axis 21 first lens group (first imaging lens)
22 Second lens group (second imaging lens)
51 Guide Ring 52 Position Adjustment Spring 53 First Lens Frame 53c Abutting Portion 54 First Moving Frame (Moving Frame)
54c Step portion 55 Second moving frame (second lens frame)
55a Projection 63 First lens frame 63c Step portion 64 First moving frame (moving frame)
64c contact part

Claims (5)

A first imaging lens disposed on the object side in the optical axis direction;
A first lens frame for holding the first imaging lens;
Moving the first lens frame between a photographing position on the object side and a storage position behind the photographing position in the optical axis direction, and a moving frame that contacts the first lens frame at the photographing position;
A position adjustment spring for urging the first lens frame toward the moving frame;
A guide ring that holds the position adjustment spring and is relatively rotatable with respect to the moving frame;
A second imaging lens disposed behind the first imaging lens in the optical axis direction;
A second lens frame for holding the second imaging lens;
The first lens frame is provided so that the position in the optical axis direction with respect to the moving frame can be adjusted by changing a contact position with the moving frame by rotation of the guide ring,
Regardless of the adjustment position of the first lens frame, the second lens frame has the first imaging lens and the second imaging lens when the first lens frame is moved to the storage position by movement of the moving frame. A lens barrel is provided so as to separate the first lens frame and the moving frame against the bias of the position adjusting spring so as not to contact the lens barrel. The lens barrel according to claim 1,
The first lens frame includes a contact portion with the moving frame,
The moving frame includes a stepped portion that is formed so as to be able to come into contact with the contact portion and has a step in the optical axis direction. The lens barrel according to claim 1,
The moving frame includes a contact portion with the first lens frame,
The first lens frame includes a stepped portion that is formed so as to be able to come into contact with the contact portion and has a step in the optical axis direction. The lens barrel according to claim 1,
The guide ring includes a holding portion that holds the first lens frame in an optical axis direction and that cannot move in the rotation direction. A first imaging lens disposed on the object side in the optical axis direction;
A first lens frame for holding the first imaging lens;
Moving the first lens frame between a photographing position on the object side and a storage position behind the photographing position in the optical axis direction, and a moving frame that contacts the first lens frame at the photographing position;
A position adjustment spring for urging the first lens frame toward the moving frame;
A guide ring that holds the position adjustment spring and is relatively rotatable with respect to the moving frame;
A second imaging lens disposed behind the first imaging lens in the optical axis direction;
A second lens frame for holding the second imaging lens;
The first lens frame is provided so that the position in the optical axis direction with respect to the moving frame can be adjusted by changing a contact position with the moving frame by rotation of the guide ring,
Regardless of the adjustment position of the first lens frame, the second lens frame has the first imaging lens and the second imaging lens when the first lens frame is moved to the storage position by movement of the moving frame. An imaging apparatus provided to separate the first lens frame and the moving frame against the bias of the position adjustment spring so as not to contact.

Images