JP4518630B2 - Lens barrel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel, and more specifically, to a so-called one-side blur in which a part of the lens image is blurred, and a lens barrel having a configuration in which the one-side blur is eliminated by adjusting the tilt of the lens with respect to the optical axis. About.
[0002]
[Prior art]
As a conventional technique for eliminating the blur by adjusting the inclination of the lens with respect to the optical axis when a part of the lens image is blurred, as shown in the front view of FIG. 6 and the cross-sectional view of FIG. It comprises a holding frame 100 and a lens barrel portion 104 that holds the lens holding frame 100 via a one-side blur adjustment frame 102. The one-sided blur adjustment frame 102 is fitted into the screw hole 120 at three circumferentially equally divided screw holes 120 extending in the radial direction, a tapered groove 122 having a thin optical axis 0 side outside the screw hole 120 in the radial direction. The adjusting screw 124 is mated. In this configuration, the one blur adjustment frame 102 is deformed by screwing one or two adjustment screws 124, that is, partially displaced in a direction parallel to the optical axis 0, and attached to the one blur adjustment frame 102. The inclination of the lens holding frame 100 with respect to the optical axis 0 is adjusted.
[0003]
[Problems to be solved by the invention]
The configuration in which the blur of the lens is adjusted by adjusting the tilt of the lens with respect to the optical axis when a part of the above-described conventional lens image formation is blurred has a large number of parts, and the assembly adjustment is complicated, and the manufacturing cost is low. Not only is it expensive, but there is a possibility that it will go wrong after adjustment.
[0004]
OBJECT OF THE INVENTION
The present invention has been made in view of the above-described problems of the configuration in which the blur of the lens is adjusted by adjusting the tilt of the lens with respect to the optical axis when a part of the lens imaging of the prior art is blurred. An object of the present invention is to provide a stable lens barrel that has a small amount of assembly, is easy to adjust in assembly, has a low manufacturing cost, and is less likely to cause a deviation after adjustment.
[0005]
[Means for Solving the Problems]
The present invention includes a lens holding frame and a lens barrel member that fixes the lens holding frame, the lens holding frame being provided on the lens side and extending intermittently in the circumferential direction, A second circumferential groove provided on the lens barrel side and extending intermittently in the circumferential direction, wherein the first circumferential groove is longer than a portion where the groove is not a groove, and the second circumferential groove is The groove portion is shorter than the non-groove portion, the groove portion of the first circumferential groove substantially coincides with the non-groove portion of the second circumferential groove in the circumferential direction, and the groove portion of the second circumferential groove The lens barrel is characterized in that a groove expanding means for expanding the width of the groove in the optical axis direction in the direction of the first circumferential groove is provided.
[0006]
Embodiments of the present application are as follows. The groove expanding means includes a screw hole extending in the radial direction, a tapered groove provided in the second circumferential groove on the outer side in the radial direction of the screw hole and having a narrow optical axis side, and an adjusting screw that fits into the screw hole It is characterized by comprising. Further, the groove expanding means includes a screw hole extending in a radial direction and an eccentric screw fitted into the screw hole and having an eccentric portion engaged with the second circumferential groove.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A lens barrel 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the lens barrel 1. FIG. 2 is a front view of the lens barrel 1. FIG. 3 is an external development view of the lens barrel 1. FIG. 4 is a cross-sectional view taken along line IV-IV in FIGS. FIG. 5 is a cross-sectional view taken along line VV in FIGS.
The lens barrel 1 includes a lens holding frame 10 having a lens gripping portion 4 that holds the lens 2, and a lens barrel member 12 that fixes the lens holding frame 10. The lens holding frame 10 includes a first circumferential groove 20 provided on the lens 2 side and extending intermittently in the circumferential direction, and a second circle provided on the lens barrel member 12 side and extending intermittently in the circumferential direction. And a circumferential groove 22.
[0008]
Here, the circumferential groove is a part that regularly repeats the groove and the non-groove part on the same circumference of the cylinder with the optical axis 0 as the center. The first circumferential groove 20 and the second circumferential groove 22 each have three circumferential groove portions. The first circumferential groove 20 is longer than the portion where the groove portion is not the groove portion, the second circumferential groove 22 is shorter than the portion where the groove portion is not the groove portion, and the groove portion of the first circumferential groove 20 is the second portion. The portion of the circumferential groove 22 that is not a groove portion substantially coincides with the circumferential direction.
A groove expanding means 30 is provided at the groove portion of the second circumferential groove 22 to expand the width of the groove in the optical axis direction in the direction of the first circumferential groove 20. The groove expanding means 30 includes a tapered screw hole 40 extending in the radial direction and an adjusting screw 42 fitted into the screw hole 40.
[0009]
In such a configuration, as the adjustment screw 42 is screwed into the screw hole 40, the tip of the adjustment screw 42 enters a portion having a small diameter at the back of the screw hole 40, and as a result, the second circumferential groove 22. The width in the optical axis direction is enlarged. A portion of the second circumferential groove 22 on the first circumferential groove 20 side is formed to have a smaller rigidity than a portion on the opposite side of the first circumferential groove 20.
Therefore, only the front portion of the second circumferential groove 22, that is, the portion on the first circumferential groove 20 side, moves in the direction of expanding the groove width due to the increase in the width of the second circumferential groove 22 in the optical axis direction. To do. As a result, the lens gripping portion 4 is centered on the portion of the second circumferential groove 22 corresponding to the other screw holes 40 ′ and 40 ″ excluding the screw hole 40 into which the adjustment screw 42 is screwed, and is not the groove portion. The portion of the second circumferential groove 22 corresponding to the screw hole 40 into which the screw 42 is screwed is pushed forward so that the inclination of the lens holding frame 10 with respect to the lens holding portion 4, that is, the lens 2 with respect to the optical axis O is inclined. Adjusted.
[0010]
As another embodiment of the present invention, an eccentric screw is arranged instead of the adjusting screw 42 and the screw hole 40 of the above embodiment, and the eccentric portion of the eccentric screw is brought into contact with the second circumferential groove 22. By adjusting the rotational angle position of the eccentric screw, the inclination of the lens with respect to the optical axis 0 is adjusted.
[0011]
【The invention's effect】
According to the present invention, when a part of the lens image is blurred, the lens barrel that can eliminate the blur by adjusting the inclination of the lens with respect to the optical axis is configured. Assembling and adjustment are simple, the manufacturing cost is low, and there is a stable effect with less risk of deviation after adjustment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lens barrel according to an embodiment of the present invention.
FIG. 2 is a front view of a lens barrel according to an embodiment of the present invention.
FIG. 3 is an external development view of the lens barrel of the present invention.
4 is a cross-sectional view taken along line IV-IV in FIGS. 2 and 3. FIG.
5 is a cross-sectional view taken along line VV in FIGS. 2 and 3. FIG.
FIG. 6 is a front view of a conventional lens barrel.
FIG. 7 is a cross-sectional view of a conventional lens barrel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Lens 4 Lens holding part 10 Lens holding frame 12 Lens barrel member 20 1st circumferential groove 22 2nd circumferential groove 30 Groove expansion means 40 Screw hole 42 Adjustment screw 50 Tapered groove

Claims (3)

A first holding groove having a lens holding frame and a lens barrel member for fixing the lens holding frame, the lens holding frame being provided on the lens side and extending intermittently in a circumferential direction; and the lens barrel member side And a second circumferential groove extending intermittently in the circumferential direction, wherein the first circumferential groove is longer than a portion where the groove portion is not a groove, and the second circumferential groove has a groove portion. The groove portion of the first circumferential groove is shorter than the groove portion, and the groove portion of the first circumferential groove partially overlaps the groove portion of the second circumferential groove in the circumferential direction. A lens barrel comprising groove expanding means for expanding the width of the groove in a direction parallel to the optical axis.   The groove expanding means includes a screw hole extending in the radial direction, a tapered groove provided in the second circumferential groove on the outer side in the radial direction of the screw hole and having a narrow optical axis side, and an adjustment screw that fits into the screw hole The lens barrel according to claim 1, comprising:   2. The groove extending means comprises a screw hole extending in a radial direction, and an eccentric screw fitted into the screw hole and having an eccentric portion engaged with the second circumferential groove. Lens barrel.

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