JP2001083388A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a lens barrel even when a lens adjusting mechanism is arranged in a narrow space between the outer periphery of a lens group and the lens barrel. SOLUTION: In this lens barrel, the short side of a lens holding part in a four-group lens holder 25 supported on a step motor base plate 12 is made in a two-way engaging state in accordance with the two-way engaging of a 4th lens L4 held by the holder 25, and a spiral pin 28 and an eccentric pin 29 are attached to the plate 12 so as to be opposed in a direction orthogonal to an optical axis in space between the two-way engaging part and the inner periphery of a straight advance barrel 6. The pin 25a of the holder 25 is fit in the spiral cam groove 28a of the pin 28 and the pin 29a of the eccentric pin 29 is fit in the fitting groove 25b of the holder 25, while the holder 25 is adjusted by moving in the optical axis direction or the direction orthogonal to the optical axis direction by rotating the pin 28 or the pin 29 by an adjusting tool from adjusting holes 3e and 3f formed on a cam barrel 3 fit to the outer periphery side in a telephoto state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel for a camera or the like.

[0002]

2. Description of the Related Art In a conventional lens barrel, a mechanism for adjusting the eccentricity and inclination of components inside the barrel such as a lens is provided by an outer periphery of a circular lens holder for holding the lens and an inner periphery of the circular barrel. It is located in the space between. In addition, since the outer diameter of the lens is large and the gap between the lens and the inner diameter of the lens barrel is small, a lens group described in Japanese Patent Application Laid-Open No. H11-212135, which is filed by the present applicant, is used in a lens group having a narrow space for disposing the adjustment mechanism. The adjusting mechanism is disposed in another lens group having a small lens diameter such as a cylinder, or as another solution, the adjusting mechanism is disposed in a lens group having a large lens diameter by increasing the diameter of a lens barrel.

[0003]

By the way, an adjusting mechanism to be disposed around a lens having a large outer diameter as in the prior art described above is another type of adjusting mechanism having a small outer diameter and a sufficient gap between the lens and the inner diameter of the lens barrel. When the adjustment mechanism is moved to the lens group, there is a case where the adjustment mechanism is disadvantageous in comparison with the case where the adjustment mechanism is arranged around a lens having a large outer diameter of the lens. In addition, if the lens barrel is enlarged and the adjustment mechanism for the components inside the lens barrel is arranged around a lens having a large outer diameter, miniaturization of the lens barrel is hindered. In addition, it is necessary to perform eccentricity adjustment in the optical axis direction with respect to a component inside the lens barrel such as a lens disposed inside the lens barrel, or a component inside the lens barrel such as a lens that enters the inside of the lens barrel by zooming. However, there was a problem that it could not reach the adjustment mechanism.

Further, in the adjustment of the optical system, since the adjustment mechanism cannot be arranged between the periphery of the lens having a large outer diameter and the lens barrel, the adjustment mechanism is arranged around another optical element having a small outer diameter. There are cases. In such a case, the adjustment may be restricted due to the difference in the sensitivity of the eccentricity of the optical element, which may be disadvantageous as compared with the case where the adjustment is performed by the adjustment mechanism arranged around the optical element having a large outer diameter.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention has a structure in which an adjusting mechanism for a component in a lens barrel is arranged between the outer periphery of a lens group and a lens barrel in which a space for arranging the adjusting mechanism is narrow. A first object is to provide a lens barrel that is compatible with miniaturization. The present invention provides an adjustment that allows adjustment of a component inside the lens barrel, which is also disposed inside the lens barrel, and a component inside the lens barrel that enters the inside of the lens barrel by zooming from a direction along one axis orthogonal to the optical axis. A second object is to provide a lens barrel having a mechanism.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an optical system in a space between a lens formed by cutting a part of an outer peripheral circle and a lens barrel from a direction perpendicular to an optical axis. An adjustment mechanism is provided for adjusting components in the lens barrel such as elements.

[0007]

The lens barrel according to the first aspect of the present invention has a shape in which at least a part of a lens outer circumference circle is cut, and is provided between an inner circumference of the lens barrel and a cut outer circumference of the lens. By arranging the adjusting mechanism for the in-barrel component, the adjusting mechanism for the in-barrel component can be arranged on the outer periphery of the lens group in which the space for arranging the adjusting mechanism is narrow, and the lens barrel can be downsized.
According to a second aspect of the present invention, the adjustment mechanism rotates the axis about a direction perpendicular to the optical axis, thereby moving the in-barrel component along the direction perpendicular to the optical axis. A first adjustment mechanism, a rotation center substantially parallel to the first adjustment mechanism, and the rotation of the first adjustment mechanism in a plane perpendicular to the optical axis;
And the second adjusting mechanism for moving the intra-barrel component in a direction substantially perpendicular to the movement of the intra-barrel component by the adjusting mechanism. Even if an adjustment mechanism that allows adjustment to be moved on the surface in a direction along one axis perpendicular to the optical axis is provided, the lens barrel does not become large.

According to a third aspect of the present invention, the lens barrel according to the present invention is rotated about an axis perpendicular to the optical axis, so that the constituent members in the lens barrel are arranged along the direction perpendicular to the optical axis. A first adjusting mechanism to be moved, and a rotation center substantially parallel to the first adjusting mechanism, and the rotation of the first adjusting mechanism in the plane perpendicular to the optical axis causes the first adjusting mechanism to move the component in the lens barrel. By having an adjustment mechanism including a second adjustment mechanism for moving the intra-barrel component in a direction substantially perpendicular to the movement,
According to a fourth aspect of the present invention, the first adjusting mechanism includes an engaging portion provided on the component member inside the lens barrel, and a cam member having a spiral cam groove into which the engaging portion is fitted. According to the present invention as set forth in claim 5, the second adjusting mechanism has a fitting groove mounted on the component member inside the lens barrel, and the fitting groove has a fitting shape. With the configuration including the eccentric member that is eccentric with respect to the axis, the adjustment of the in-barrel component disposed in the barrel and the in-barrel component that enters the barrel by zooming can be easily performed. In the lens barrel according to the present invention as set forth in claim 6, since the constituent members in the barrel according to claims 1 to 5 are optical elements, the optical element disposed in the lens barrel or the zoom lens inside the lens barrel by zooming. The adjustment of the entering optical element can be easily performed, and the lens barrel can be downsized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view of a lens barrel of the present embodiment in a wide state, and FIG. FIG. 3 is a longitudinal sectional view of the lens barrel at the time of telephoto. In the figure, 1 is a camera body, 2 is a fixed cylinder, which is attached to the camera body 1 and has a helicoid 2a and a not-shown rectilinear groove on its inner peripheral portion, and a gear (not shown) on its side. Have columns. Reference numeral 3 denotes a cam cylinder, on the outer periphery of which a helicoid 3a for helicoid coupling with the helicoid 2a of the fixed cylinder 2 is provided.
The inner peripheral portion has three first cam grooves 3b, the second cam groove 3c, and the third cam groove 3d at three places, and the rear end portion has engaging claws for engaging with a rotating ring 4 described later. Further, adjustment holes 3e and 3f are provided orthogonal to the optical axis to insert an adjustment tool such as a screwdriver at the time of adjustment, and are rotated by a gear train provided in the fixed cylinder 2 to move back and forth along the optical axis. It has become.

Reference numeral 4 denotes a ring-shaped rotating ring which engages with the engaging claw of the cam barrel 3 and moves a rectilinear barrel 6 and a rectilinear ring 5 described later in the optical axis direction with the longitudinal movement of the cam barrel 3. Moving. Numeral 5 is a disk-shaped rectilinear ring, which has a key (not shown) for engaging with a rectilinear groove (not shown) of the fixed cylinder 2 and an opening 5a at the center which also serves as a visual field mask. 6
, And moves back and forth in the optical axis direction together with the cam barrel 3 by the rotating ring 4. Reference numeral 6 denotes a straight-moving cylinder having three straight-moving keys 6a penetrating the side surface and an adjusting hole 6 for adjusting the fourth group.
b, 6c, and is screwed to a rectilinear ring 5 described later.

Reference numeral 7 denotes a first-group cam pin.
The three rectilinear keys 6a of the rectilinear cylinder 6 are press-fitted into three holes 10a provided on the outer periphery of the linear cylinder 6 and respectively attached thereto.
And fitted into three first cam grooves 3b of the cam cylinder 3. Reference numeral 8 denotes a second group cam pin.
1 and press-fitted into three holes 11a provided on the outer peripheral portion of the cam cylinder 3, and penetrated through the three rectilinear keys 6a of the rectilinear cylinder 6 and into the three second cam grooves 3c of the cam cylinder 3. Mated. Reference numeral 9 denotes a cam pin for a step motor, and three holes 1 provided on an outer peripheral portion of a step motor base plate 12 described later.
3a of the cam barrel 3 through the three straight keys 6a of the straight barrel 6.
It is fitted in the cam groove 3d.

Reference numeral 10 denotes a first-group lens barrel, which is fitted on the inner diameter of the cam barrel 3 and holds a first-group lens holder 23 and a barrier driving device 26 described later on the inner circumference thereof. It is moved back and forth in the optical axis direction by the first group cam pins 7 pressed into the holes 10a. Reference numeral 11 denotes a second-group lens barrel, which is fitted on the inner diameter of the first-group lens barrel 10, holds a second-group lens holder 24 described below on the inner periphery thereof, and is press-fitted into a hole 11a on the outer peripheral surface thereof. The second group cam pins 8 move back and forth in the optical axis direction.
Reference numeral 12 denotes a stepping motor base plate, which is moved back and forth in the optical axis direction by a stepping motor cam pin 9 which is press-fitted into a hole 12a provided on an outer peripheral portion thereof, and is provided along a rotation center of a spiral pin 28 described later. 4th lens holder pin 2
A screw bar 14 which has a main plate fitting groove 12b into which the reference numeral 5a fits, and which press-fits a known stepping motor 13 and a rotating shaft of a rotor of the stepping motor 13 to drive a third lens holder 16 described later in the optical axis direction. A fitting bar (not shown) for moving the third lens holder 16 straight in the optical axis direction, and a steady bar (not shown) for restricting rotation of the third lens holder 16;
The shutter base plate 15 and the fourth group holder 25 are held.

Reference numeral 16 denotes a third group lens holder, which is driven in the optical axis direction by the screw bar 14 and the nut 17, holds the third group lens L3, and a sleeve (not shown) held on the step motor base plate 12 by a fitting bar. , And furthermore, is supported so as to be able to move straight back and forth in the optical axis direction by being rotationally restricted by a steady rest bar (not shown). Reference numeral 18 denotes a shutter drive unit, which is attached to the shutter base plate 15;
It comprises a magnet, a coil and the like, and drives the shutter blade 19 to open and close. Reference numeral 20 denotes a shutter holding plate attached to the shutter base plate 15, reference numeral 21 denotes an opening control blade, and reference numeral 22 denotes an opening control base fixed to the shutter base plate 15.

Reference numeral 23 denotes a first-group lens holder, and a first-group lens L
1 is fixed to the first lens barrel 10. Reference numeral 24 denotes a second group lens holder which holds the second group lens L2 and is fixed to the second group lens barrel 11. Reference numeral 25 denotes a fourth group lens holder, which is a fourth group lens L having two short sides.
The fourth group lens holder pins 25 which hold the short sides of the lens housing portion in two sides in accordance with the two sides thereof, and which fit into the base plate fitting grooves 12a of the step motor base plate 12.
a and a fourth-group lens holder fitting groove 25b. 2
Reference numeral 6 denotes a barrier driving device which drives the barrier blades 27 and
It is fixed to the group lens barrel 10. Reference numeral 28 denotes a helical pin, which is attached to the step motor base plate 12, is rotatable about an axis perpendicular to the optical axis, and has a helical cam groove 28a into which the fourth lens holder pin 25a is fitted. are doing. An eccentric pin 29 is attached to the step motor base plate 12, is rotatable about an axis substantially parallel to the rotation center of the spiral pin 28, and is a pin that fits into the fourth group lens holder fitting groove 25b. 29a.

Reference numeral 30 denotes a spiral pin stopper which is attached to the step motor base plate 12 and regulates the axial direction of the spiral pin 28. Reference numeral 31 denotes an eccentric pin stopper which is attached to the step motor
9 are regulated in the axial direction. Reference numeral 32 denotes a stepped screw which is screwed to the step motor base plate 12 to regulate the movement of the fourth lens holder 25 in the optical axis direction. 33 is a wave washer, the stepped screw 32 and the fourth group lens holder 2
5, a frictional force is generated and the eccentricity of the fourth lens holder 25 is held. 34 is a makeup tube,
After the fourth group is adjusted, it is attached to the cam cylinder 3, and the adjustment holes 3e,
3f is shielded from light. A decorative plate 35 is attached to the front of the barrier driving device 26, and rotatably supports the barrier blade 27.

The mechanism for adjusting the lens barrel constituted by the above components will be described. 4th lens holder 25 is 4
The short side of the lens housing portion is taken in two directions in accordance with the two-way taking of the group lens L4, and a spiral is formed in the space between the inner peripheral portion of the rectilinear barrel 6 and the two-way taking portion of the short side of the fourth group lens holder 25. Pin 28, eccentric pin 29, spiral pin stopper 30, eccentric pin 31,
The stepped screw 32 and the wave washer 33 are arranged. Thus, the eccentric mechanisms are arranged in four groups without increasing the lens barrel diameter. Then, when the helical pin 28 is rotated about an axis perpendicular to the optical axis, the cam groove 2 of the helical pin 28 is rotated.
The fourth group lens holder pin 25a fitted to 8a is moved along the base plate fitting groove 12b of the step motor base plate 12. Accordingly, the fourth group lens holder 25 is provided with the main plate fitting groove 12b.
The eccentricity adjustment is possible along.

Further, since the fourth group lens holder fitting groove 25b is fitted to the pin 29a of the eccentric pin 29, when the eccentric pin 29 is rotated about an axis perpendicular to the optical axis, the eccentric pin 29 is rotated. With the eccentricity of the pin 29a with respect to the rotation center of the lens, the fourth lens group holder 25 moves in a direction perpendicular to the rotation center axis of the eccentric pin 29. Spiral pin 28 and eccentric pin 2
Since the rotation centers of the lenses 9 are substantially parallel, the direction of adjustment of the fourth group lens holder 25 by the helical pin 28 and the direction of adjustment of the fourth group lens holder 25 by the eccentric pin 29 are substantially orthogonal, and the fourth group lens holder 25 is The eccentricity can be adjusted on a vertical plane.

Next, the state in which the adjustment is performed will be described.
FIG. 3 shows a telephoto state in which the lens barrel is zoomed. In this case, since the fourth group lens holder 25 moves deep inside the lens barrel by zooming, the fourth group lens holder 25 cannot be adjusted by inserting an adjustment tool from behind the optical axis. Therefore, the cam cylinder 3
In the state in which the cosmetic tube 34 is not attached, a tool is inserted through the adjustment holes 3e and 3f of the cam tube 3 and the adjustment holes 6b and 6c of the rectilinear cylinder 6 from a direction perpendicular to the optical axis, and the helical pin 28 and the eccentric pin 29 are rotated. By doing so, the eccentricity of the fourth group lens holder 25 can be adjusted as described above. After the fourth group eccentricity adjustment, the decorative cylinder 34 is attached to the cam cylinder 3 and the adjustment holes 3e, 3
Blocking f blocks light, and the fourth-group eccentricity adjustment process ends.

By using the above-described adjustment mechanism, in an ideal state for adjustment, even in a lens group that moves deep inside the lens barrel by zooming or the like, or a lens group originally inside the lens barrel, eccentricity adjustment is performed as it is. It can be performed.

In this embodiment, the fourth group lens holder 30 is used.
Between the two-way section on the short side of the lens and the rectilinear barrel 6
Although the mechanism for adjusting the eccentricity is arranged, the adjusting mechanism is not limited to the eccentricity adjustment. Further, as the portion where the eccentricity adjusting mechanism is disposed, the lens and the lens holder are not limited to the two-way configuration, and may have a shape obtained by cutting a circle such as a D-cut.

[0021]

As described above, the lens barrel according to the first aspect of the present invention has a shape in which at least a part of the lens outer circumference is cut, and the inner circumference of the lens barrel and the cut outer circumference of the lens. The adjustment mechanism for the components inside the lens barrel is placed between the lens and the lens. To According to a second aspect of the present invention, the adjustment mechanism rotates the axis about a direction perpendicular to the optical axis, thereby moving the in-barrel component along the direction perpendicular to the optical axis. A first adjustment mechanism, and a rotation center substantially parallel to the first adjustment mechanism, the rotation of which causes movement of the in-barrel component by the first adjustment mechanism in a plane perpendicular to the optical axis. And a second adjustment mechanism for moving the intra-barrel component in a direction substantially perpendicular to the axis, so that the adjustment for moving the intra-barrel component on a plane perpendicular to the optical axis can be performed in one axis perpendicular to the optical axis. An adjustment mechanism that can be performed from a direction along the direction is enabled without increasing the size of the lens barrel.

In the lens barrel according to the third aspect of the present invention, by rotating the lens barrel about an axis perpendicular to the optical axis, the constituent members in the barrel along the direction perpendicular to the optical axis are rotated. A first adjusting mechanism to be moved, and a rotation center substantially parallel to the first adjusting mechanism, and the rotation of the first adjusting mechanism in the plane perpendicular to the optical axis causes the first adjusting mechanism to move the component in the lens barrel. By having an adjustment mechanism including a second adjustment mechanism for moving the intra-barrel component in a direction substantially perpendicular to the movement,
According to a fourth aspect of the present invention, the first adjusting mechanism includes an engaging portion provided on the component member inside the lens barrel, and a cam member having a spiral cam groove into which the engaging portion is fitted. According to the present invention as set forth in claim 5, the second adjusting mechanism has a fitting groove mounted on the component member inside the lens barrel, and the fitting groove has a fitting shape. By being configured with the eccentric member that is eccentric with respect to the axis, it is easy to adjust the intra-barrel components disposed inside the lens barrel and the intra-barrel components that enter the lens barrel by zooming. Can be. Claim 6
The lens barrel according to the present invention, wherein the constituent member in the barrel according to any one of claims 1 to 5 is an optical element, an optical element disposed in the barrel or an optical element that enters the inside of the barrel by zooming. Can be easily adjusted, and the lens barrel can be downsized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a lens barrel according to an embodiment of the present invention in a wide state. FIG. 3 is a vertical cross-sectional view of the lens barrel during telephoto.

FIG. 2 is a rear view of the adjustment mechanism.

FIG. 3 is a vertical sectional view of the lens barrel at the time of telephoto.

[Explanation of symbols]

L1 ... 1 group lens, L2 ... 2 group lens, L3 ... 3
Group lens, L4..4 group lens, 1..Camera body, 2
..Fixed cylinder, 3 ... Cam cylinder, 4 ... Rotating ring, 5 ...
Straight running ring, 6 straight barrel, 7 1 group cam pin, 8
・ 2nd group cam pin, 9 ・ ・ Cam pin for step motor, 1
0..1 group lens barrel, 11.2 group lens barrel, 12 step motor base plate, 13 step motor, 14 screw bar, 15 shutter base plate, 16 group holder, 18
..Shutter drive unit, 19, shutter blades, 22
Opening regulation base plate, 23 1st lens holder, 24 2
Group lens holder, 25 group lens holder, 25a group
· Pin, 25b · · · Fitting groove, 26 · · · Barrier drive device
28 helical pin, 28a cam groove, 29 eccentric pin, 30 helical pin stopper, 31 eccentric pin stopper, 32 stepped screw, 33 wave washer,
34 .. Makeup tube, 35 .. Makeup board.

Claims (6)

[Claims] At least a part of a lens outer circumference circle is cut, and an adjusting mechanism for a component in the lens barrel is arranged between an inner circumference of the lens barrel and a cut outer circumference of the lens. Lens barrel. 2. A first adjustment for rotating the component in the lens barrel along a direction perpendicular to the optical axis by rotating the adjustment mechanism about an axis perpendicular to the optical axis. A mechanism and a rotation center substantially parallel to the first adjustment mechanism;
The rotation of the component in the lens barrel by the first adjustment mechanism in a plane perpendicular to the optical axis by the rotation comprises a second adjustment mechanism for moving the component in the lens barrel in a direction substantially perpendicular to the optical axis. The lens barrel according to claim 1, wherein: 3. A first adjustment mechanism for moving a component inside the lens barrel in a direction perpendicular to the optical axis by rotating the optical axis about an axis perpendicular to the optical axis. A rotation center substantially parallel to the first adjustment mechanism, and the rotation of the lens barrel in a direction substantially perpendicular to the movement of the component in the lens barrel by the first adjustment mechanism in a plane perpendicular to the optical axis due to the rotation. A lens barrel comprising an adjustment mechanism including a second adjustment mechanism for moving an internal component. 4. The first adjusting mechanism comprises an engaging portion provided on the component member inside the lens barrel, and a cam member having a spiral cam groove into which the engaging portion is fitted. The lens barrel according to claim 3, wherein 5. The second adjusting mechanism comprises a fitting groove mounted on the component member inside the lens barrel, and an eccentric member fitted in the fitting groove and having an outer shape eccentric with respect to an axis. The lens barrel according to claim 3, wherein the lens barrel is formed. 6. A lens barrel according to claim 1, wherein the constituent member in the barrel is an optical element.