JP3103892B2 - Lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel , and more particularly, means for driving an aperture blade can be constituted by a small number of parts, and can be compactly arranged around a taking lens. It is intended to provide a lens barrel .

[0002]

2. Description of the Related Art For example, a lens barrel for a camera is usually provided with an iris adjustment mechanism for adjusting an aperture amount. It comprises a plurality of diaphragm blades movable in a direction including a component in the direction, supporting means for movably supporting the diaphragm blades, driving means for moving the diaphragm blades, and the like.

As means for driving the aperture blades in the conventional iris adjusting mechanism, for example, Japanese Utility Model Publication No.
As shown in -20105, movable coil
So-called moving coil type meter type
It was common.

[0004]

[SUMMARY OF THE INVENTION However, it shall apply to the drive means using a menu over motor as a driving source, the main over data times
When the turning angle is regulated and a large moving amount is required
Must increase the lever ratio, and inevitably torque
, The meter must be increased.
Also, the output drops at both ends of the rotation angle. In addition, winding on assembly
There was a problem that was difficult .

This problem goes against the miniaturization of products.
is there.

Further, the moving coil type meter type driving device itself is a relatively large component composed of a large number of components, and the rotary motion of the meter is controlled along the moving direction of the diaphragm blade.
When a motion conversion mechanism for converting the motion into the direction of movement is added, the iris adjustment mechanism requires a large number of parts only by its driving means, and has a problem that it becomes considerably large.

[0007] Since most of such driving means must be disposed on the side of the photographing lens system, the outer diameter of the lens barrel becomes large, and if the outer diameter is to be made as small as possible. There is a problem in that the shape is partially protruded and the positional relationship with the camera body is restricted.

[0008]

SUMMARY OF THE INVENTION Accordingly, a lens mirror according to the present invention is provided.
In order to solve the above-mentioned problem, the cylinder is the optical axis of
The guide shaft, which is arranged approximately parallel to the
Coil around which a coil is wound around the guide shaft.
Irbobin and two planes that intersect at a predetermined angle
That is, a substantially U-shaped bent portion is formed on one plane.
Along with a generally U-shaped bent part on the other plane
A wire having a substantially L-shaped bent portion,
Engage the bent side end of the U-shape with the
It moves and rotates along the guide axis of the
An orthogonal transformer that rotates with the rotation of the orthogonal transformer.
Abuts on the end of the L-shaped bent portion and is perpendicular to the optical axis direction.
The elevating body that moves in the direction
Move perpendicular to the axial direction and alternately crossing in the opposite direction
And a pair of aperture blades .

[0009]

[Action] Therefore, in the present invention the lens barrel, Actinobacillus
The movement of the coil bobbin of the
Orthogonal transformer is folded to convert to along-axis motion
Most of the driving means
It can be placed compactly on the side and therefore has
Can be formed in a shape with little protrusion to the side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the lens barrel according to the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

In the embodiment shown in the drawings, the present invention is applied to an iris adjusting mechanism in a lens barrel.

In FIG. 1, reference numeral 1 denotes a lens barrel, which is used, for example, as a lens barrel for a video camera.

Reference numeral 2 denotes an outer shell of the lens barrel 1, wherein a substantially cylindrical outer shell front portion 3 and an outer shell rear portion 4 having substantially the same size and a substantially annular front shell 5 are integrally connected. Become composed.

The outer shell front part 3 has a substantially U-shaped main part 6 which is open upward when viewed from the front, and a substantially C-shape which bulges upward when viewed from the front. And a coupling flange 8 projecting outward from a front edge of the main portion 6 and a coupling flange 9 projecting outward from a rear edge of the main portion 6. Each is formed.

The outer shell rear portion 4 has a substantially vertically elongated U-shaped main portion 10 which is open upward when viewed from the front, and a substantially C-shaped shape which expands upward when viewed from the front. And a top wall 11 disposed so as to cover an upper part of the main part 1.
Coupling flange 12 projecting outward from the front edge of
Are formed.

A rear wall 1 is provided at the rear end of the outer shell rear portion 4.
3, a large mounting hole 13a having a circular shape is formed in the rear wall 13, and circular supporting recesses 13b and 13c are formed in the front surface of the rear wall 13 at the center of the upper and lower portions in the left-right direction. (See FIGS. 1 and 8).

The front shell 5 comprises a substantially cylindrical main portion 14 which is short in the axial direction, and a substantially semicircular closing portion 15 protruding upward from the upper end of the main portion 14. It has a shallow concave shape that opens toward.

The main portion 14 has a lens holding portion 14a extending in an annular shape along the inner peripheral surface thereof, and a circular support concave portion which is open at the upper portion and which is open rearward at the boundary with the closing portion 15. 14b, and a circular support concave portion 14c located below the lens holding portion 14a and opened rearward.

The outer shell front portion 3 and the outer shell rear portion 4 are fixed to each other by a fixing means (not shown) in which the peripheral edge of the coupling flange 9 and the peripheral edge of the coupling flange 12 are fitted to each other. The peripheral edge of the rear surface of the front shell 5 and the peripheral edge of the coupling flange 8 of the front shell 3 are fitted to each other, and are fixed to the outer shell 5 by fixing means (not shown).

Thus, the outer shell front portion 3, the outer shell rear portion 4, and the front shell 5 are integrally connected to each other, thereby forming a substantially cylindrical outer shell 2 extending in the front-rear direction. The upper surface wall of the shell 2 is formed in a substantially upside down gutter shape.

Reference numeral 16 denotes a flat intermediate wall disposed inside the outer shell 2 and at the front end of the outer shell rear portion 4, the outer shape of which is the inner side as viewed from the front of the main portion 10 of the outer shell rear portion 4. Of the mounting piece 16 from the left and right side edges thereof.
a, 16a are projected outward, and the mounting pieces 16a,
16a is fixed to the left and right sides of the coupling flange 12 of the outer shell rear part 4 by screws 17, 17, whereby
The intermediate wall 16 is located so as to divide the inner space of the outer shell 2 into two parts, excluding the upper end thereof.

A relatively large hole 16b having a circular shape is formed substantially at the center of the intermediate wall 16, and a cylindrical shape integral with the intermediate wall 16 is formed from the opening edge on the rear side of the hole 16b. The lens holding portion 18 protrudes rearward, and is located coaxially with the lens holding portion 14a of the front shell 5 and the mounting hole 13a of the outer shell rear portion 4.

The remaining portion of the intermediate wall 16 will be described later.

Reference numerals 19, 20, 21, 22, and 23 denote lenses having a predetermined light control function. The foremost lens 19 is held in the lens holding portion 14a of the front shell 5 so as to be fitted inside. The third and fourth lenses 20 and 21 are held in the lens holding portion 18 of the intermediate wall 16 so as to be fitted inside. The second lens 22 from the front is a zoom lens,
That is, the lens for adjusting the angle of view, the last lens 23 is a focus lens, that is, a lens for focusing, and the zoom lens 22 and the focus lens 23 are separate lenses which can be moved in the front-rear direction. Each is held by a holding member.

The lenses 19, 20, 21, 2
The lenses 2 and 23 are arranged so that their optical axes coincide with each other.
Each of 22 and 23 is actually formed by joining a plurality of lenses to each other.

Reference numeral 24 denotes an image sensor holder, the main part 2 of which is shown.
Reference numeral 5 denotes a disc-like shape, and a rectangular concave portion 25a is formed on the back surface of the main portion 25, and a light passage hole 26 opened on the front surface of the image sensor holder 24 and the concave portion 25a.
Are formed.

An image sensor 27 has a light receiving surface 27a.
Of the image sensor holder 24 in the direction in which
a, and is fixed.

Such an image sensor holder 24 is attached to the rear wall 13 of the outer shell rear portion 4 so as to close the mounting hole 13a, whereby the light receiving surface 2 of the image sensor 27 is closed.
7a is behind the focus lens 23, the lens 19,
It is arranged on the optical axis of a lens system consisting of 20, 21, 22 and 23.

The light from the outside is transmitted through the lenses 19, 2
The light passes through 0, 21, 22 and 23 and is received on the light receiving surface 27a of the image sensor 27.

Reference numeral 28 denotes a guide shaft for movably supporting a coil bobbin and an iris driving body, which will be described later. The guide shaft 28 is made of a material having good magnetic permeability and has a length slightly shorter than the length of the outer shell 2. It has a columnar shape, and a front half portion 28b (hereinafter, referred to as a "first half") excluding a front end portion 28a has a second half portion 28c (hereinafter, referred to as a "second half portion") and a front end portion 28a. A part 28d of the outer peripheral surface of the front half part 28b (hereinafter referred to as "spring contact surface")
Say ) Is formed on a flat surface over the entire axial direction.

The guide shaft 28 has a front end 28a with the spring contact surface 28d facing downward.
Is formed in the support recess 14b formed at the boundary between the lens holding portion 14a and the closing portion 15 of the front shell 5, and the upper support recess 13b is formed at the rear end of the support recess 13b in the rear wall 13 of the outer shell rear portion 4.
, Respectively, so that the guide shaft 2
Reference numeral 8 is disposed at a position near the upper end of the inner space of the outer shell 2 so as to extend in a direction parallel to the optical axis of the lens system.

The guide shaft 28 does not necessarily have to be magnetically permeable as a whole. For example, a portion of the guide shaft 28 on the axial center side in the radial direction is formed of a material having magnetic permeability, and the portion on the outer surface side is formed. It may be made of a material having good slipperiness.

Numeral 29 denotes a cylindrical auxiliary guide shaft for holding the posture of each lens holding member described later. Both ends of the auxiliary guide shaft are provided with a lower supporting recess 14c formed in the front shell 5 and a back wall 13. The inner shell 2 is separately supported in the lower supporting recess 13 c formed in the inner space of the outer shell 2 in parallel with the guide shaft 28.

Reference numeral 30 denotes a zoom lens holding member for holding the zoom lens 22. Zoom lens holding member 3
Reference numeral 0 denotes a lens holder 31 having a substantially rectangular plate shape slightly longer in the vertical direction when viewed from the front and rear, and a coil bobbin 32 having a substantially cylindrical shape are integrally formed of a synthetic resin. Two flanges 32a, 32a protruding outward are formed at both end edges in the direction, and the rear flange of the flanges 32a, 32a is connected to the upper end edge of the lens holding portion 31.

Therefore, the coil bobbin 32 is located above the lens holder 31 so that its axial direction extends in a direction parallel to the thickness direction of the lens holder 31.

The inner diameter of the coil bobbin 32 is
8 is formed substantially the same as or slightly larger than the outer shape of the front half 28b.

Reference numeral 33 denotes a lens holder having a substantially ring shape. The zoom lens 22 is held in the lens holder 33 so as to be fitted inside. The lens holder 33 is formed on the lens holding portion 31 of the zoom lens holding member 30. Mounting hole 31
a and is fixed.

Reference numeral 31b denotes an engagement notch formed substantially at the center of the lower end edge of the lens holding portion 31 of the zoom lens holding member 30.

The zoom lens holding member 30 is slidably supported by the guide shaft 28 by the cylindrical portion 32b of the coil bobbin 32 being fitted around the front half 28b of the guide shaft 28. When the auxiliary guide shaft 29 is slidably engaged with the notch 31b, the position in the direction around the axis with respect to the guide shaft 28 is regulated, whereby the attitude of the zoom lens holding member 30 is held constant.

Thus, the zoom lens 22 is supported via the zoom lens holding member 30 so as to be movable in a direction parallel to the guide shaft 28.

Reference numeral 34 denotes a cylindrical portion 32 of the coil bobbin 32.
b is a press-contact spring made of a leaf spring material fixed to a lower portion of the inner peripheral surface of the guide bob.
The press-contact spring 34 is fitted to the front half 28b of the
Is pressed against the spring contact surface 28d of the guide shaft 28 so that no rattling occurs between the zoom lens holding member 30 and the guide shaft 28.

Reference numeral 35 denotes a cylindrical portion 32 of the coil bobbin 32.
The movable coil wound around b.

Reference numeral 36 denotes a focus lens holding member for holding the focus lens 23. Since the focus lens holding member 36 has substantially the same shape and structure as the zoom lens holding member 30 of the zoom lens 22, the description will be simplified.

The focus lens holding member 36 has a substantially rectangular flat plate-shaped lens holding portion 37 and the lens holding portion 37.
And a substantially cylindrical coil bobbin 38 integrally protruded rearward from the upper end of the coil bobbin.

The inner diameter of the coil bobbin 38 is substantially the same as or slightly larger than the outer diameter of the rear half 28c of the guide shaft 28, and is smaller than the coil bobbin 32 of the zoom lens holding member 30. .

Outwardly projecting flanges 38a, 38a are integrally formed at both ends in the front-rear direction of the coil bobbin 38, and the lower end of the front flange 38a of the flanges 38a, 38a is connected to the upper end of the lens holding portion 37. The center is continuous.

Reference numeral 39 denotes a lens holder having a substantially ring shape. The focus lens 23 is held in the lens holder 39 so as to be fitted inside. The lens holder 39 has a mounting hole 37a formed in the lens holding member 37. Embedded in the
And it is fixed.

Reference numeral 37b denotes an engagement notch formed at the center of the lower edge of the lens holding portion 37.

The focus lens holding member 36 is slidably supported by the guide shaft 28 by fitting the cylindrical portion 38b of the coil bobbin 38 to the rear half portion 28c of the guide shaft 28, and the engagement notch When the auxiliary guide shaft 29 is slidably engaged with 37b, its position in the direction around the axis with respect to the guide shaft 28 is regulated.

The focus lens 23 is supported by the focus lens holding member 36 so as to be movable in a direction parallel to the guide shaft 28.

Reference numeral 40 denotes a cylindrical portion 38 of the coil bobbin 38.
The movable coil wound around b.

As described above, the zoom lens holding member 3
0 and the focus lens holding member 36 are supported by one guide shaft 28, so that these lens holding members 30, 36
As long as the dimensional accuracy of each part is increased, both lenses 22,
The optical axes of 23 can be easily matched.

Reference numerals 41 and 42 denote outer yokes. The outer yokes 41 and 42 have a shape obtained by removing a part of a thin cylindrical shape in the circumferential direction.
This is referred to as "first outer yoke". ) Is on the inner surface of the upper surface wall 7 of the outer shell front portion 3, and the other outer yoke 42 (hereinafter, referred to as “second outer yoke”) is on the upper surface wall 11 of the outer shell rear portion 4.
The notches 41a and 42a are fixed to the inner surface of the guide shaft 28 so as to be coaxial with the guide shaft 28 in a downward direction.

Reference numerals 43, 44 and 45 denote connecting yokes (see FIG. 1), each of which has a shape in which a part of a thick circular band in the circumferential direction is removed. 1
Of the connecting yoke. " ) Are attached to the first outer yoke 41 so as to close the front end surface thereof, and the inner peripheral surface 43 a thereof is provided so as to be in contact with the outer peripheral surface of the guide shaft 28. (Hereinafter, referred to as "second connecting yoke") and 45 (hereinafter, referred to as "third connecting yoke").
Say ) Are attached to the second outer yoke 42 such that the front and rear end surfaces thereof are individually closed, and the inner peripheral surface 44 thereof is
a and 45 a are provided so as to contact the outer peripheral surface of the guide shaft 28.

Reference numerals 46 and 47 denote cylindrical magnets. These magnets 46 and 47 are outer yokes 41 and 4.
As in the case of 2, a part of the cylindrical shape in the circumferential direction is removed, and one of them 46 (hereinafter referred to as “first magnet”) is substantially the same as the front half 28 b of the guide shaft 28. The notch 46a has a length, and the first outer yoke 41
Of the first outer yoke 41 so as to match the notch 41a of the first outer yoke.
The other magnet 47 (hereinafter, referred to as a “second magnet”) has a length approximately half that of the rear half portion 28 c of the guide shaft 28, and the notch 47 a is formed in the second magnet 47. A second connection yoke which is an inner peripheral surface of the second outer yoke 42 so as to coincide with the notch 42a of the outer yoke 42, and a rear end surface of which is attached to a rear end of the second outer yoke 42. It is fixed so as to contact with 44.

Thus, the movable coil 35 supported by the front half 28 b of the guide shaft 28 and the zoom lens holding member 30
, The first magnet 46 and the first outer yoke 41 are arranged coaxially with each other in this order from the center side, and the guide shaft 28 and the first outer yoke 41 are connected via the first connecting yoke 43. Thereby, the first magnet 46 -the first outer yoke 41 -the first connecting yoke 43-
A closed magnetic path of the guide shaft 28-the space between the guide shaft 28 and the first magnet 46-the first magnet 46 is formed, and the movable coil 35 is located in the space.

Accordingly, one voice coil type actuator 48 (hereinafter referred to as a “zoom lens actuator”) is formed by the guide shaft 28, the first outer yoke 41, the first connecting yoke 43, the first magnet 46 and the movable coil 35. ").

The second half 28c of the guide shaft 28 and the second
The movable coil 40 supported by the focus lens holding member 36, the second magnet 47, and the second outer yoke 42
Are coaxially arranged in this order from the center side, and the guide shaft 28 and the second outer yoke 42 are connected via a second connecting yoke 44, whereby the second magnet 47-second A closed magnetic path is formed between the outer yoke 42, the second connecting yoke 44, the guide shaft 28, the space between the guide shaft 28 and the second magnet 47, and the closed magnetic path of the second magnet 47. Is located.

Accordingly, another voice coil type actuator 49 (hereinafter referred to as a “focus lens actuator”) is formed by the guide shaft 28, the second outer yoke 42, the second connecting yoke 44, the second magnet 47 and the movable coil 40. ").

Therefore, when a drive current is supplied to the movable coil 35 or 40, a moving force is applied to the movable coil 35 or 40 in a direction along the axial direction and in a direction corresponding to the direction of the drive current. Therefore, the zoom lens holding member 30 or the focus lens member 36
Is moved forward or backward, respectively, whereby the zoom lens 22 or the focus lens 23 is moved in the optical axis direction, respectively.

The moving range of the zoom lens holding member 30 is substantially equal to the length of the first magnet 46, and the moving range of the focus lens holding member 36 is substantially equal to the length of the second magnet 47. .

Reference numeral 50 denotes an iris adjusting mechanism, which includes two aperture blades, a support plate that movably supports the aperture blades,
A rotator engaged with the aperture blade, a voice coil type actuator configured with the guide shaft 28 as an inner yoke, an iris driver as a moving body of the actuator, and a iris driver and a rotator. It comprises an orthogonal transformation mechanism and the like provided between them.

Reference numerals 51 and 52 are aperture blades. The aperture blades 51 and 52 are made of a substantially rectangular thin sheet metal material, and one of the aperture blades 51 (hereinafter, referred to as “front aperture blade”) has a lower edge and a lower edge of a right edge viewed from the front. The other aperture blade 52 (hereinafter, referred to as “rear aperture blade”) has a notch 54 that is open at the upper edge thereof, and these notches 53, 54 are formed by two aperture blades 51, 52. When they are superimposed, they are basically made substantially circular. The front diaphragm blade 51 has two vertically extending cut grooves 51a, 51a on the left side when viewed from the front, and an engagement long hole 51b long on the lower side at the lower end. Is formed. The rear diaphragm blade 52 is formed with two vertically extending long cut grooves 52a, 52a on the right side thereof when viewed from the front, and has a vertically long cut groove at its lower end. An engagement long hole 52b is formed.

Reference numerals 55 and 56 mainly denote the diaphragm blades 51 and
The support plates 55 and 56 are provided with circular light passing holes 57 and 58 substantially in the center thereof. Below 57, 58, notches 59, 60 which are substantially M-shaped as viewed from the front and reach the lower end thereof are formed, and the left and right side edges of these notches 59, 60 are arc-shaped concave curved edges. Is formed.

At the left and right side edges of the support plates 55, 56, mounting pieces 61, 61, 62, 62 are respectively provided so as to protrude toward the side, and these support plates 55, 56 overlap with each other in the front-rear direction. It is fixed to the front surface of the intermediate wall 16 in the fitted state, and the fixing is performed by the mounting pieces 61, 61 and 6.
2, 62 are fixed to the outer shell rear part 4 together with the intermediate wall 16 by the screws 17, 17, and the light passing holes 57, 58 are located coaxially with the optical axis of the lens system.

The left and right sides 56a, 5a of the rear support plate 56
6a is formed thick so that its front surface protrudes slightly forward from the front surface of the other portions, and therefore, a thin space 63 is formed between it and the front support plate 55.

On the front surface of the thin portion of the rear support plate 56, relatively small guide pins 64, 64,... It is protruding.

The two diaphragm blades 51 and 52 are arranged in the thin space 63 in a state where they are overlapped with each other in the front-rear direction, and the cut grooves 51 a and 51 of the front diaphragm blade 51 are arranged.
a are slidably engaged with the two guide pins 64, 64,.
Two guide pins 64, 64 on the right side are slidably engaged with a, 52a, whereby the diaphragm blades 51, 52 are supported on the support plate 56 so as to be movable up and down within a certain range. You.

Reference numeral 65 denotes a rotator, which is a slender, substantially rhombus-shaped main portion 66 which is long from side to side as viewed from the front, a shaft 67 projecting rearward from the center of the main portion 66, and a main portion 66 Engagement pins 68, 68 protruding from both ends of the front surface of the
A relatively long pressed pin 69 protruding from the right end of the
Are integrally formed.

The main part 66 of such a rotator 65 is located in the notches 59, 60 of the support plates 55, 56, and the shaft 67 is formed at the center of the lower end of the intermediate wall 16. It is rotatably supported by the intermediate wall 16 by being inserted into the support hole 16c.

The two engaging pins 68 of the rotor 65
Reference numeral 68 denotes a long slot 51 formed in the aperture blades 51 and 52.
b and 52b are slidably engaged with each other, so that when the rotating element 65 is rotated, the engaging pins 68 and 68 are engaged.
Presses the side edges of the long engagement holes 51b and 52b in directions opposite to each other, so that the two diaphragm blades 51 and 52
Are simultaneously moved in the directions opposite to each other, so that the notches 5 of the two diaphragm blades 51 and 52 have
The size of the iris hole formed by the notches 53 and 54 is changed by changing the amount of overlap between 3 and 54.

FIG. 4 shows a state in which the front diaphragm blade 51 is at the lower end position in the moving range, and the rear diaphragm blade 52 is at the upper end position in the moving range. The hole is fully closed, and from this state, when the rotator 65 is rotated clockwise as viewed from the front, the front diaphragm blade 51 is moved upward and the rear diaphragm blade 52 is moved downward. As the diameter of the iris hole increases, the diameter of the iris hole increases.

Most of the tip of the pressed pin 69 of the rotator 65 protrudes rearward through a circular arc-shaped insertion hole 16 d formed in the intermediate wall 16.

Reference numeral 70 denotes a torsion spring, and a coil portion 70a of the arm 67b is supported by a portion of the shaft 67 of the rotator 65 projecting rearward from the intermediate wall 16 so as to be fitted outside.
Is elastically contacted with a spring contact pin 71 (see FIG. 5) protruding from the lower end left end of the intermediate wall 16, and the distal end of the other arm 70 c is located behind the pressed pin 69 of the rotator 65. It is elastically contacted from below.

Accordingly, since the pressed pin 69 of the rotator 65 is always pressed substantially upward by the other arm 70c of the torsion spring 70, this pressing causes the rotator 6 to be pressed.
5 is energized in a counterclockwise direction when viewed from the front, and a force acts in a direction in which the iris hole is reduced in diameter.

Reference numeral 72 denotes an elevating body. The elevating body 72 is substantially L-shaped when viewed from behind, and a vertically extending portion 72a is formed integrally with the right end of the back surface of the intermediate wall 16. A lower end 72b which is slidably supported in the up-down direction by a guide portion 73 having a substantially rectangular cylindrical shape and extends in the left-right direction.
Is in contact with the tip of the pressed pin 69 of the rotator 65 from above.

Since the torsion spring 70 elastically contacts the lower end 72b of the elevating body 72 via the pressed pin 69 of the rotator 65, an upward moving force is applied to the elevating body 72, Is held at an initial position in contact with the lower end surface of the guide portion 73, and in this state, the iris hole is fully closed.

Numeral 74 denotes an orthogonal transformer, each part of which is integrally formed of a highly rigid wire.

The orthogonal transformer 74 comprises a supported portion 74a and a connecting portion 74b extending parallel to each other in the left-right direction, and a relatively short connecting portion 74c connecting the left ends of the supported portion 74a and the connecting portion 74b. A substantially L-shaped pressing portion 74d projecting from the right end of the supported portion 74a in a direction perpendicular to the axial direction of the supported portion 74a and in a direction perpendicular to the connecting portion 74c when viewed from the side; Consists of

In the orthogonal transformer 74, the supported portion 74a is pivoted in the direction around its axis by the supporting portions 75, 75 formed substantially above the outer peripheral surface of the lens holding portion 18 of the intermediate wall 16. The connecting portion 74b is supported so as to be freely movable, and is connected to an iris driving body movable in the front-rear direction of a third actuator to be described later. It is opposed to the end face.

The vertical movement of the iris driver, which will be described later, is performed by the lifting / lowering body 72 and the orthogonal transformer 74 in the vertical direction, that is, the movement parallel to the moving direction of the diaphragm blades 51 and 52. Orthogonal transformation mechanism 7 for converting to
6 are configured.

The operation of the orthogonal transformation mechanism 76 will be described later.

Reference numeral 77 denotes an iris driver formed of a synthetic resin. The main part 78 has a coil bobbin shape, and a substantially L-shaped connecting part 79 as viewed from the left and right is provided on the back surface of the main part 78. (See FIG. 11).

Reference numeral 80 denotes a movable coil wound around the cylindrical portion 78a of the main portion 78 of the iris driver 77.

The iris driving body 77 is slidably supported by the guide shaft 28 by inserting the rear half portion 28c of the guide shaft 28 into a hole of the cylindrical portion 78a of the main portion 78. The connecting portion 74b of the orthogonal transformer 74 is slidably engaged with the groove 79a, thereby connecting the orthogonal transformer 74 and the iris driver 77.

Reference numeral 81 denotes a magnet.
1 (hereinafter, referred to as “third magnet”) has a shape similar to the first and second magnets 46 and 47, with a portion of the cylindrical shape removed in the circumferential direction. Is slightly shorter than the length of the second magnet 47, and the notch 81a is aligned with the notch 42a of the outer yoke 42 at a position near the front end on the inner peripheral surface of the second outer yoke 42, and The edge is fixed so as to contact the third connecting yoke 45.

Thus, the movable coil 80 supported by the rear half 28 c of the guide shaft 28 and the iris
The magnet 81 and the second outer yoke 42 are coaxially arranged in this order from the center side, and the guide shaft 2
8 and the second outer yoke 42 are connected via a third connecting yoke 45, whereby the third magnet 81 -the second outer yoke 42 -the third connecting yoke 45 -the guide shaft 28 -the guide shaft. A closed magnetic path between the space 28 and the third magnet 81 -the third magnet 81 is formed, and the movable coil 80 is located in the space. Therefore, one voice coil type actuator 82 (hereinafter, referred to as “iris actuator”) is configured by the guide shaft 28, the second outer yoke 42, the movable coil 80, and the third magnet 81.

Then, when a driving current is supplied to the movable coil 80, a moving force is applied to the movable coil 80 in a direction along the axial direction thereof and in a direction corresponding to the direction of the driving current. With this moving force, the iris driver 77
Is moved back and forth.

The moving range of the iris driver 77 is the third range.
In the initial state in which the length of the magnet 81 substantially coincides with the length of the magnet 81 and the iris driving body 77 comes to the rear end position in the moving range as shown in FIG.
4d is the elevating body 7 located at the upper end position in the movement range.
Lightly touching the upper end face of 2 or facing closely
Accordingly, in this state, the rotator 65 is held at the initial position, and the iris hole is held in the fully closed state.

When the drive current is supplied to the movable coil 80 to move the iris driver 77 forward as described above, the orthogonal transformer 74 moves forward in the direction of falling forward with the supported part 74a as a fulcrum. When rotated, the pressing portion 74d presses the elevating body 72 downward. Then, the elevating body 72 is moved downward, and the lower end portion 72b thereof pushes the pressed pin 69 of the rotator 65 substantially downward. Against the force, it is rotated clockwise as viewed from the front, whereby the front diaphragm blade 51 moves upward and the rear diaphragm blade 52 moves downward, whereby the iris hole is enlarged. Go.

When the iris driver 77 is moved rearward, the orthogonal transformer 74 is rotated in the upward direction, and its pressing portion 74d is moved substantially upward. The elevating body 72 by the elastic force of the spring 70
Is pushed counterclockwise when viewed from the front while the front diaphragm blade 51 is moved downward and the rear diaphragm blade 52 is moved upward, whereby the iris hole is reduced in diameter. go.

Thus, zooming by moving the zoom lens 22, focusing by moving the focus lens 23, and aperture blades 51, 52
Is adjusted by moving each of the voice coil type actuators 48, 49, and 82 arranged on one guide shaft 28.

[0093]

As is apparent from the above description, the lens barrel of the present invention is substantially parallel to the optical axis of the taking lens.
Guided by the guide shaft and the guide shaft,
And a coil bobbin wound with a coil orbiting the guide shaft.
And one of two planes that intersect at a predetermined angle
A substantially U-shaped bent part is formed on a plane,
On the other plane, a substantially L-shaped portion following the substantially U-shaped bent portion
A wire rod with a bent part formed on a coil bobbin
Engage the substantially U-shaped bent portion end side to make the coil bobbin
Orthogonal transformation that moves and rotates along the guide axis of
And a substantially L-shaped fold that rotates with the rotation of the orthogonal transformer.
Abut on the end of the bent part, and move in the direction orthogonal to the optical axis direction.
The moving elevating body and the moving
A pair of apertures that intersect and move alternately in the opposite direction
And a wing .

[0094] Therefore, in the present invention the lens barrel, A
Movement of the coil bobbin of the actuator to move the blade
Orthogonal transformers for converting motion in the direction along
Most of the driving means
Can be placed compactly on the sides of the
The outer shape can be made into a shape with little protrusion to the side
You.

In the above-described embodiment, the guide shaft is formed of a magnetically permeable material so that the guide shaft has a function as an inner yoke of the actuator. Since the inner yoke as an independent part can be omitted,
The size of the actuator in the radial direction can be reduced, and the shape of the iris adjustment mechanism can be further reduced.

In the embodiments, the moving direction of the diaphragm blade is described as being a linear direction perpendicular to the optical axis of the photographing lens. However, in the lens barrel of the present invention, the moving direction of the diaphragm blade is a spiral direction. It can also be applied to things.

Further, the specific shapes and structures shown in the above embodiments are merely examples of the embodiment of the lens barrel of the present invention. The scope should not be construed as limiting.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of an embodiment of a lens barrel according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG.

FIG. 7 is an exploded perspective view showing a main part of a front half of the lens barrel with a part cut away.

FIG. 8 is an exploded perspective view showing a main part of a rear half of the lens barrel with a part cut away.

FIG. 9 is an enlarged perspective view of a main part of the iris adjustment mechanism as viewed from the rear.

FIG. 10 is an enlarged exploded perspective view of the iris adjustment mechanism.

FIG. 11 is a partially enlarged view of FIG. 1;

[Description of Signs] 1 Lens barrel 19, 20, 21, 22, 23 Photographing lens 28 Guide shaft 51 Aperture blade 52 Aperture blade 72 Elevating body 74 Orthogonal transformer 74b Substantially U-shaped bent portion end side 74d Substantially L-shaped bent part end side 77 Coil bobbin 80 Coil

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-111337 (JP, A) JP-A-56-61105 (JP, A) Real opening Sho-59-153527 (JP, U) Real opening 81638 (JP, U) Japanese Utility Model Showa 60-16506 (JP, U) Japanese Utility Model Showa 62-98211 (JP, U) Japanese Utility Model Showa 60-16126 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 9/02-9/07

Claims (1)

(57) [Claims] An optical axis of the photographing lens;
Guide shaft, and guided by the guide shaft and around the guide shaft.
The coil bobbin around which the coil to be wound is wound, and one of two planes intersecting at a predetermined angle.
Has a substantially U-shaped bent portion and the other
On a plane, a substantially L-shaped fold following the substantially U-shaped bent portion
A wire having a bent portion, wherein the coil bobbin
And the end portion side of the substantially U-shaped bent portion is engaged with the
Move along the guide axis of the ilbobin and rotate
An orthogonal transformer that moves and the substantially L-shaped member that rotates with the rotation of the orthogonal transformer.
The one that abuts the bent part end side and is orthogonal to the optical axis direction.
The elevating body moving in the direction, and with the movement of the elevating body, orthogonal to the optical axis direction, and
And a pair of diaphragm blades that move alternately in the opposite direction
A lens barrel characterized by comprising a.