JP2010066720A5 - - Google Patents

Description

Lens barrel and imaging device having the same

The present invention relates to a lens barrel and an imaging apparatus including the lens barrel, and more particularly to a lens barrel that can adjust the position of a lens frame in a lens frame that holds a lens used in a camera and an optical apparatus, and the same. The present invention relates to an imaging device .

Recent cameras and video cameras have been increasing in magnification, and in order to satisfy this, the diameter of the lens itself is increasing.
In particular, the diameter of the lens arranged closest to the subject in the lens group constituting the lens barrel tends to increase.
On the other hand, the miniaturization of cameras and video devices themselves is progressing, and as the size is reduced, the positional accuracy of the lens becomes severe in order to satisfy optical performance.
The optical performance cannot be satisfied only by increasing the accuracy and lens performance of the components constituting the lens barrel, and therefore it is necessary to adjust the lens position according to the individual lens barrel.
For example, eccentricity adjustment that aligns the lens axis, inclination adjustment that adjusts the inclination of the lens axis, or tracking adjustment that adjusts the distance between adjacent lenses is performed.

Conventionally, in order to enable the position adjustment as described above, for example, Patent Document 1 proposes the following lens frame structure.
With this lens frame structure, the lens frame that has been adjusted to the optimal location while observing the optical characteristics and the housing are directly attached to the housing that can be moved within the adjustment range within the space using an adhesive. It is configured to adhere.
JP 2001-296463 A

However, in the case where the lens frame and the casing are directly bonded with an adhesive as in the above-described conventional patent document 1, the peeling strength in the thrust direction depends only on the strength of the adhesive. The following issues arise.
That is, in the case of a lens having a relatively large lens diameter, the weight of the lens is heavy, so when an external force such as an impact force is applied to the lens barrel, the adhesive force is lost to the external force to hold the lens. There is a case where the lens frame that falls off falls from the housing.
As described above, a space is provided between the lens frame and the housing so that the lens frame can be adjusted. Thus, when the lens frame is detached from the housing, the lens frame moves freely in the space, The lens position adjusted according to the lens barrel will be out of order. In order to avoid these problems, conventional measures have been taken by increasing the amount of adhesive applied.However, such measures not only make it difficult to manage the amount of adhesion, but it also takes time to fix, and what is the optimal countermeasure? I could not say it.

In view of the above-described problems, the present invention includes a lens barrel that can be adjusted in position with a simple structure with respect to the lens frame and that does not depend on the strength of the adhesive and does not fall off due to an external force. It is an object of the present invention to provide an image pickup apparatus .

In order to solve the above-described problems, the present invention provides a lens barrel configured as follows and an imaging apparatus including the lens barrel .
The lens barrel of the present invention includes a lens frame that holds a lens, an adjusting frame for supporting the lens frame, a lens barrel configured to adjustably with respect to the reference axis the lens frame ,
The lens frame includes an extending portion extending in the radial direction, while the adjustment frame includes a convex portion extending in the radial direction,
And the extending portion and the convex portion, upon installing the lens frame to the adjustment frame, forms the shape of the space in the thrust direction at a position overlapping the optical axis direction,
Wherein said lens frame position adjustment is performed in the space portion, the adhesive filled in the space portion can be adhered to the adjusting frame.
Further, lens barrel according to the present invention, reference frame for fixing the adjustment frame, characterized in that is further provided.
The lens barrel of the present invention is characterized in that the reference frame and the adjustment frame are integrally formed.
In the lens barrel of the present invention, the lens frame or the adjustment frame is provided with an adjustment surface, and the adjustment surface includes a plurality of surfaces whose heights are changed in the thrust direction.
Due to the relative rotation of the lens frame and the adjustment frame, any one of the plurality of surfaces in the adjustment surface provided on any one of the frames is changed to any one of the other frames. is brought into contact with the receiving surface provided, characterized in that it is a possible tracking adjustment.
Further, in the lens barrel of the present invention, the lens frame includes an adjustment surface that is supported so as to be capable of adjusting an inclination with respect to a receiving surface provided on the adjustment frame. characterized in that it is a possible inclination adjustment of the optical axis.
In the lens barrel of the present invention, the lens frame includes an adjustment surface that is supported so as to be adjustable with respect to a receiving surface provided on the adjustment frame, and the adjustment surface has a height in the thrust direction. Consists of multiple changed surfaces,
Tracking adjustment by rotating any one of a plurality of surfaces of the adjustment surface provided on the lens frame to a receiving surface provided on the adjustment frame by rotation of the lens frame with respect to the adjustment frame As well as
Wherein in adjusting the adjustment plane Been, characterized in that the adjusting surface, wherein the inclination adjustably supported are possible inclination adjustment of the optical axis of the lens with respect to the reference axis.
In addition, an imaging apparatus of the present invention includes any one of the lens barrels described above.

According to the present invention, a lens barrel that can be adjusted in position with a simple structure with respect to the lens frame and does not depend on the strength of the adhesive and does not fall off due to an external force, and an imaging apparatus including the lens barrel Can be realized.

According to the above configuration, it is possible to achieve a lens barrel that is simple and strong against external force and has good mass productivity.
As a specific example of the embodiment, for example, a lens barrel that includes a lens frame that holds a lens and an adjustment frame that supports the lens frame, and is configured to be able to adjust the position of the lens frame with respect to a reference axis. It can be configured as follows.
The lens frame includes an extending portion that extends in a radial direction from an outer peripheral portion of the lens frame.
On the other hand, the adjustment frame is configured to include a convex portion extending in the radial direction, and the extension portion and the convex portion overlap each other in the optical axis direction when the lens frame is installed on the adjustment frame. In the structure, the space is formed in the thrust direction.
Then, after the position of the lens frame is adjusted in the space, the space is filled with an adhesive so that the lens frame can be bonded to the adjustment frame.

According to the above configuration, the lens frame 1 is positioned at the position where the extended portion of the lens frame 1 enters the lower part of the convex portion of the adjustment frame 3, and bonded so as to fill the thrust space created by both. Can be fixed.
Further, according to such a configuration, even if an external force is applied on the upper side in the thrust direction, the lens frame does not fall out due to the absence of the space where it can drop off.
Furthermore, according to such a configuration, since it is sufficient that at least the adhesion sufficient to fill the space is required, it is not necessary to increase the adhesive wastefully, and the management of the adhesion amount is facilitated.

Examples of the present invention will be described below.
[Example 1]
In Example 1, a configuration example of a lens barrel to which the configuration of the present invention is applied will be described.
The lens barrel in the present embodiment moves the adjustment lens 2 in a direction parallel to the optical axis in accordance with another lens group (not shown) constituting the lens barrel, or the optical axis of the adjustment lens 2 is a reference axis. Is adjusted to a position that satisfies the optical accuracy.
In the following description, adjustment by movement in a direction parallel to the optical axis is referred to as tracking adjustment, and adjustment for tilting the optical axis of the adjustment lens 2 with respect to the reference axis is referred to as tilt adjustment.
FIG. 1 is an exploded perspective view illustrating a configuration example of a lens barrel in the present embodiment.
In FIG. 1, 1 is a lens frame, 1a is an extension portion, 1b to 1f are adjustment surfaces, 2 is an adjustment lens, 3 is an adjustment frame, 3a is a receiving surface, 3b is a convex portion, and 3c is a left portion of the convex portion. The provided opening 4 is a reference frame.

First, the lens barrel in the present embodiment will be described.
In this embodiment, a lens frame 1 for holding an adjustment lens is provided in the central opening.
The lens frame 1 is provided with three extending portions 1a extending in the radial direction, equally divided by 120 degrees.
Further, on the outer peripheral surface of the lens frame 1, five adjustment surfaces 1b to 1f arranged at different heights according to the tracking adjustment width (see FIG. 6) are provided at three positions equally divided by 120 degrees. Yes.
Each of the adjustment surfaces 1b to 1f is composed of an R surface from a certain center point that is optimal for adjusting the inclination of the surface (see FIG. 4). This mechanism will be described later.
Reference numeral 3 denotes an adjustment frame that holds the above-described lens frame 1 in an adjustable manner.
One of the adjustment surfaces 1b to 1f provided on the lens frame 1 is in contact with the inner peripheral portion and has a receiving surface 3a that supports the lens frame, and is provided at three locations equally at 120 degrees. The adjustment frame 3 is fixed to a reference frame 4 described later by screwing or the like.
Reference numeral 4 denotes a reference frame which is a reference for constituting the adjustment lens group.
Although not shown, the reference frame 4 is connected to another lens group, and is configured as a lens barrel including a plurality of groups.

Next, the adjustment mechanism of the lens frame 1 in the present embodiment will be described.
4 is a cross-sectional view taken along line AA in FIG. 3 for explaining the position of the receiving surface 3a of the adjustment frame 3 and the extending portion 1a of the lens frame 1. FIG.
FIG. 6 is a detailed perspective view of the lens frame 1 in the lens barrel of the present embodiment.
Any one of the adjustment surfaces 1b to 1f of the lens frame 1 is brought into contact with the receiving surface 3a of the adjustment frame 3.
As shown in FIG. 6, the adjustment surfaces 1 b to 1 f are formed in a step shape, and the lens frame can be moved in the thrust direction by changing the surface to be brought into contact with the receiving surface of the adjustment frame 3. It is configured.
Thus, tracking adjustment is performed.
In this embodiment, there are five adjustment surfaces, and the five adjustment surfaces are configured to be adjustable. However, the present invention is not limited to such a configuration, and the number and steps of the surfaces are optical characteristics. It is possible to set arbitrarily according to.
Further, as shown in FIG. 4, the adjustment surfaces 1 b to 1 f have an R shape centered on a vertex having the surface shape.
With these, in contact with the receiving surface 3a, it becomes possible to move in an arc shape (in the direction of the arrow in the figure) around the apex, and the optical axis of the lens can be inclined with respect to the reference axis. ing.
Thus, the tilt adjustment is performed.
As described above, tracking adjustment and tilt adjustment are performed, and the optimum lens position for each lens barrel is determined.

Next, the assembly configuration of the lens frame 1 and the method for adhering the adjusted lens frame 1 in the present embodiment will be described.
FIG. 2 is a top view showing a configuration when the lens barrel of the present embodiment is assembled. FIG. 3 is a top view showing a configuration at the time of position adjustment of the lens barrel of the present embodiment. First, the adjustment frame 3 is fixed to the reference frame 4 by screwing or the like. A method for assembling the lens frame from this state will be described below.
The lens frame 1 is dropped into the adjustment frame 2 at a phase where the position of the opening 3c provided on the left side of the convex portion 3b and the position of the extending portion 1a of the lens frame 2 match.
When the lens frame 1 is rotated clockwise from this position, the contact surface can be changed in the order of the adjustment surfaces 1b, 1c, 1d, 1e, and 1f with respect to the receiving surface 3a each time the lens frame 1 is rotated. It has become.
Tracking adjustment can be performed by changing the rotational position of the lens frame 1 as described above.

Further, at the position in contact with the adjustment surfaces 1b to 1f, as shown in FIGS. 3 and 5, at least a part of the extending portion 1a of the lens frame 1 is in the thrust direction of the convex portion 3b of the adjustment frame 3. Enter the bottom (the back side of the paper in the top view, the bottom side of the paper in the cross-sectional view)
And it is set as the structure which has a space in a thrust direction (the space in FIG. 5 is set to B).
Due to the presence of the space B, the extension portion 1a does not interfere with the convex portion 3b even if the lens frame 1 is moved in order to perform tracking adjustment or inclination adjustment.
After the tracking adjustment / tilt adjustment is completed, the lens frame 1 adjusted to the optimum lens position is bonded and fixed by an adhesive at this position.
As shown in FIG. 5, the bonding is performed by filling an adhesive so as to fill the thrust space B between the extending portion 1 a of the lens frame 1 and the convex portion 3 b of the adjustment frame 3 and fixing them.
5 in FIG. 5 represents an adhesive. The adhesive has a viscosity such as an ultraviolet curing agent, and after curing, an adhesive having a volume is used.

Even if an external force is applied to the lower side in the thrust direction in FIG.
However, in the conventional structure, when trying to configure tracking and tilt adjustment, as described above, a thrust direction space is required between the lens frame and the housing. When the external force on the upper side was applied, there was a risk of falling off in this space.

In this embodiment, the space that could fall off is filled and fixed with an adhesive, and even if an external force is applied on the upper side in the thrust direction, there is no possibility that the lens frame may fall off due to the elimination of the space that can be dropped off. Does not occur.
According to the conventional configuration, countermeasures have been taken by increasing the bonding area so as not to drop off. However, in the present invention, at least, it is only necessary to bond to fill the space, so the adhesive is increased wastefully. It is not necessary and the amount of adhesion can be easily managed.

Thus, according to the present embodiment, the lens frame 1 is adjusted in position at the position where the extended portion 1a of the lens frame 1 enters the lower portion of the convex portion 3b of the adjustment frame 3, and a thrust space created by both of them. The adhesive is fixed to fill.
As a result, the lens frame can be configured not to drop off even when an external force is applied to the lens barrel.

[Example 2]
In the second embodiment, a configuration example of a lens barrel provided with an adjustment reference frame 13 in which the reference frame 4 and the adjustment frame 3 are configured as an integral part will be described.
FIG. 7 illustrates a configuration example of a lens barrel having an adjustment reference frame in the present embodiment.
FIG. 8 is an exploded perspective view showing the configuration of the lens frame of this embodiment when adjusting the position.
7 and 8, 13 is an adjustment reference frame, 13 a is a receiving surface, 13 b is a convex portion, and 13 c is an opening of the adjustment reference frame 13. In addition, description is abbreviate | omitted about the components similar to Example 1. FIG.

In the first embodiment, the reference frame 4 and the adjustment frame 3 are separate parts and are fixed by screw tightening or the like.
On the other hand, in this embodiment, the adjustment reference frame 13 is formed as an integral part by integrally forming them.
Similar to the adjustment frame of the first embodiment, the adjustment reference frame 13 of this embodiment includes a receiving surface 13a on the inner peripheral portion and a convex portion 13b extending in the radial direction.
Although not shown, this adjustment reference frame 13 is connected to another lens group to constitute a lens barrel composed of a plurality of groups.
The adjustment of the lens frame 1 is performed with reference to the adjustment reference frame 13.

The adjustment method of the lens frame 1 is the same as that of the first embodiment.
The lens frame is dropped into the adjustment reference frame at a phase where the position of the extending portion 1a of the lens frame 1 coincides with the position of the opening 13c of the adjustment reference frame 13.
By rotating clockwise from this state, tracking adjustment is performed, and tilt adjustment is further performed at that position to determine an optimum lens position (see FIG. 8).
Similar to the first embodiment, a thrust space is provided below the extending portion 1a, and the convex portions 13b overlap each other.
When the lens position is determined, the lens frame 1 is fixed by filling the thrust space between the extending portion 1a and the convex portion 13b with an adhesive and fixing it.
In this configuration, the adjustment reference frame 13 has a high viscosity in order to prevent the adhesive from leaking because the opening 13c opens at the lower portion of the convex portion 13b due to processing (mold configuration). It is better to use it.
In the configuration of the present embodiment, the tracking adjustment is performed, and the inclination adjustment is possible in the adjustment surface where the adjustment is performed, and it is possible to prevent the falling off against an external force such as an impact, and the number of parts is reduced. It is possible to configure with a minimum.

As described above, in this embodiment, the lens holder configuration capable of tracking adjustment and tilt adjustment is used, but only one of the adjustments may be used as long as the position of the lens is adjusted. Further, other adjustments can be similarly performed.
In the present embodiment, the adjustment surfaces 1b to 1f provided in a step shape are provided on the lens frame 1, and the receiving surfaces 3a and 13a serving as support surfaces thereof are provided on the adjustment frame or the adjustment reference frame. It does not matter if it is reversed.
Specifically, for example, an adjustment surface is provided on one of the lens frame and the adjustment frame.
Then, by relative rotation between the lens frame and the adjustment frame, any one of the plurality of surfaces in the adjustment surface provided on any one of the frames is changed to any one of the other You may make it contact | abut to the receiving surface provided in the frame, and may comprise tracking adjustment.

1 is an exploded perspective view illustrating a configuration example of a lens barrel in Embodiment 1 of the present invention. FIG. 3 is a top view illustrating a configuration at the time of assembling the lens barrel in Embodiment 1 of the present invention. It is a top view which shows the structure at the time of lens adjustment of the lens barrel in Example 1 of this invention. 3 is a cross-sectional view taken along line AA in FIG. 3 for explaining the position of the receiving surface of the adjustment frame and the extending portion of the lens frame in Embodiment 1 of the present invention. FIG. The A section enlarged view of FIG. 4 in Example 1 of this invention. 1 is a detailed perspective view of a lens frame in a lens barrel in Embodiment 1 of the present invention. FIG. 6 is a diagram illustrating a configuration example of a lens barrel provided with an adjustment reference frame in Embodiment 2 of the present invention. FIG. 6 is an exploded perspective view illustrating a configuration when adjusting the position of a lens frame according to a second embodiment of the present invention.

1: Lens frame 1a: Extension part 1b-1f: Adjustment surface 2: Adjustment lens 3: Adjustment frame 3a: Receiving surface 3b: Convex part 3c: Opening part 4 provided on the left part of the convex part: Reference frame 13: Adjustment reference frame 13a: receiving surface 13b: convex portion 13c: opening of adjustment reference frame

Claims (7)

A lens barrel that includes a lens frame that holds a lens and an adjustment frame that supports the lens frame, and is configured to be capable of adjusting the position of the lens frame with respect to a reference axis;
The lens frame includes an extending portion extending in the radial direction, while the adjustment frame includes a convex portion extending in the radial direction,
And the extending portion and the convex portion, upon installing the lens frame to the adjustment frame, forms the shape of the space in the thrust direction at a position overlapping the optical axis direction,
A lens barrel, which is a possible adhesion to the adjusting frame position adjustment is performed a lens frame within the space portion, the adhesive filled in the space portion. The lens barrel according to claim 1, further comprising a reference frame for fixing the adjustment frame. The lens barrel according to claim 1, wherein the reference frame and the adjustment frame are integrally formed. The lens frame or the adjustment frame is provided with an adjustment surface, and the adjustment surface includes a plurality of surfaces whose heights are changed in the thrust direction.
Due to the relative rotation of the lens frame and the adjustment frame, any one of the plurality of surfaces in the adjustment surface provided on any one of the frames is changed to any one of the other frames. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel is in contact with a provided receiving surface and tracking adjustment is possible. Said lens frame, said an adjustment surface being inclination adjustably supported relative to the receiving surface provided on the adjusting frame, it is possible to tilt adjustment of the optical axis of the lens with respect to the reference axis by the adjustment surface The lens barrel according to any one of claims 1 to 3, wherein: The lens frame includes an adjustment surface that is supported so as to be adjustable with respect to a receiving surface provided on the adjustment frame, and the adjustment surface includes a plurality of surfaces whose heights are changed in the thrust direction.
Tracking adjustment by rotating any one of a plurality of surfaces of the adjustment surface provided on the lens frame to a receiving surface provided on the adjustment frame by rotation of the lens frame with respect to the adjustment frame As well as
In the adjustment of the adjustment plane went any of claims 1 to 3, characterized in that said it is possible to tilt adjustably supported by the lens tilt adjustment of the optical axis with respect to the reference axis by the adjustment surface The lens barrel according to item 1. An imaging apparatus comprising the lens barrel according to any one of claims 1 to 6.