JPH0980560A - Lens barrel and optical instrument using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothen the restraining and nonrestraining of a vibration proof function by abutting a restraining member, so as to limit the turning range of the driving and restraining part of an optical holding means and coating the abutting surface with fats and oils. SOLUTION: The locking ring 719 of a restraining means is attached to the base plate 71 of a base plate part through a bayonet. The locking ring 719 is turned in a locking direction, to be inserted into the base plate 71 and rotated in a locking releasing direction, to be attached through the bayonet and its fall-off is prevented by a locking rubber 726, to obtain a stable restraining device having excellent assemblability and a small actuating noise. A coil 720 in a part where the mass of the locking ring 719 is concentrated is received by the locking rubber 726, to prevent a deterioration in the tone quality of the noise produced during operation and the deformation of the locking ring 719 during operation. Moreover, the abutting surfaces of the locking rubber 726 and the locking ring 719 are coated with the fats and oils (silicone fats and oils). The sticking of the locking rubber 726 and the locking ring 719 is prevented with the fats and oils, to always stably release the locking.

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 an optical device using the lens barrel, and more particularly to image shake that occurs on the image plane when subjected to vibration of a relatively low frequency (about 1 Hz to 12 Hz) such as camera shake. An optical device such as a 35 mm film camera or a video camera in which an optical holding means (correction means) for holding a part of the lens (optical element) in the optical system is driven in a direction orthogonal to the optical axis for correction. It is suitable for cameras).

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, are automated, so that even an inexperienced person in camera operation is very unlikely to fail in photographing.

Recently, a system for preventing camera shake (anti-vibration system) applied to a camera has been studied, and the factor which induces a photographer to make a photographing error has almost disappeared.
Here, a system for preventing camera shake will be briefly described.

[0004] Camera shake at the time of photographing is generally a vibration of 1 Hz to 12 Hz as a frequency. As a basic idea to enable taking a picture without image blur even if such camera shake occurs at the time of shutter release, the camera vibration due to the above camera shake is detected and corrected according to the detected value Displacing the lens.

[0005] Therefore, in order to take a photograph in which no image shake occurs even if camera shake occurs, first, it is necessary to accurately detect the vibration of the camera and, second, to correct the optical axis change due to camera shake. . In principle, this vibration (camera shake) is detected by means of vibration detecting means for detecting angular acceleration, angular velocity, angular displacement, etc., and by integrating the output signal from the vibration detecting means electrically or mechanically. This is achieved by mounting a camera shake detecting means for outputting an angular displacement on a camera. Then, based on the detected information, the optical holding means (correction means) holding the optical elements such as the lens and the prism are deflected in a direction orthogonal to the optical axis to prevent image blur.

FIG. 15 is a schematic view of a main part of a vibration isolation system using a conventional vibration detecting means used in a camera or the like. This figure shows a system that suppresses image shake in the direction of arrow 81 (camera vertical shake 81p, camera horizontal shake 81y).

In the figure, reference numeral 82 denotes a lens barrel, 83p, 83y
Are vibration detecting means for detecting camera vertical vibration (vibration direction 84p) and camera horizontal vibration (vibration direction 84y). Reference numeral 85 denotes a correction unit for correcting image blur caused by vibration, and a correction optical element (such as a prism or a lens)
Holding 86p and 86y are coils,
The thrust is given to the correcting means 85. 87p and 87y are position detecting elements, respectively, which detect the position of the correcting means 85. The correction unit 85 drives the output signals from the vibration detection units 83p and 83y as target values using a position control loop, and thereby corrects the image blur due to the vibration.

[0008]

Optical holding means (correction means) holding an optical element (prism or lens element) for image stabilization is provided within a predetermined plane based on a signal from the vibration detection means at a high speed and at a high speed. If an attempt is made to accurately drive the image shake due to vibration, there arises a problem that the driving means becomes large and the whole apparatus becomes complicated and large.

Further, when the drive of the anti-vibration system is turned on and off by rotating the locking means to bring the locking means into contact with another member, the locking means contacts the other member. There is a problem that it is deformed or the locking means sticks to other members, which makes it difficult to smoothly lock and unlock the anti-vibration drive.

According to the present invention, an optical holding means for holding an optical element such as a lens or a prism, for example, an optical holding means (correction means) for holding an optical element for image stabilization is used as an optical axis based on a signal from the vibration detecting means. It is possible to smoothly perform locking (locking) and unlocking (unlocking) of the anti-vibration function when it is suitable for an anti-vibration system that corrects image shake due to vibration by sliding it in a plane orthogonal to An object of the present invention is to provide a lens barrel and an optical device using the lens barrel, which prevents the user from being unable to take a picture due to an unlocking error.

[0011]

The lens barrel according to the present invention comprises: (1-1) Optical holding means for holding an optical element and driving it in a direction orthogonal to the optical axis is driven by a supporting means fixed in the lens barrel. The optical holding means is mounted so that it can be locked and unlocked by rotating the locking portion, and the rotation range of the locking portion is restricted by contacting a part of the limiting member. It is characterized in that the contact surface between the locking portion and the limiting member is coated with oil and fat.

(1-2) The optical holding means for holding the optical element and driving it in the direction orthogonal to the optical axis is drivably mounted on the support means fixed in the lens barrel, and the drive of the optical holding means is locked. And a non-locking state is selected by the rotation direction of the rotation operation of the locking section, and locking means is coupled to the supporting means, and the rotation range of the locking section is defined by the supporting means and the locking section. It is characterized in that a part of the restricting member provided between the parts is contacted with the restricting member, and oil is applied to the contact surface between the locking portion and the restricting member.

(1-3) The optical holding means for holding the optical element and driving it in the direction orthogonal to the optical axis is drivably mounted on the supporting means fixed in the lens barrel, and the drive of the optical holding means is locked. And a non-locking are selected by the rotation direction of the rotation operation of the locking portion, the locking means is coupled to the supporting means, and the driving range of the locking portion is brought into contact with a part of the limiting member. It is characterized in that oil is applied to the contact surface between the locking portion and the restriction member.

The optical device of the present invention has the above-mentioned configuration (1-
It is characterized in that an image is formed on a predetermined surface by using the lens barrel of any one of 1) to (1-3).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a main part of a first embodiment of a lens barrel of an optical device using a vibration isolation system according to the present invention. In the figure, the rear protruding ears 71a of the main plate 71 (three locations are provided in the figure, but two locations are shown in the figure) are fitted to a lens barrel (not shown), and a known lens barrel roller or the like is formed into a hole. 71b
It is screwed to and fixed to the lens barrel.

A second yoke (fixed portion) 72 made of a magnetic material and having a bright plating is screwed into a hole 71c of a base plate 71 with a screw penetrating a hole 72a provided on the circumference. A permanent magnet 73 (shift magnet) such as a neodymium magnet is magnetically attracted to the second yoke 72. The arrow 73a indicates the magnetization direction of each permanent magnet 73. 74 is a lens as an optical element for image stabilization. The coils 76p and 76y (shift coils) are patch-bonded to a support frame 75 to which the lens 74 is fixed with a C-ring or the like.
Light emitting elements 77p and 77y such as IRED are also adhered to the back surface of the support frame 75. Light fluxes from the light projecting elements 77p and 77y pass through the slits 75ap and 75ay and are described later in PSD.
And the like, and enters the position detecting elements 78p and 78y.

The holes 75b (three places) of the support frame 75 are shown in FIG.
As shown in FIG.
b and the charge spring 710 are loaded, and the support sphere 79a is heat caulked and fixed to the support frame 75 (the support sphere 79).
b is slidable in the extending direction of the hole 75b against the spring force of the charge spring 710. ).

FIG. 2 is a cross-sectional view of the lens barrel after assembly, in which a support ball 79b, a charged charge spring 710, and a support ball 79a are inserted in the hole 75b of the support frame 75 in the direction of arrow 79c in this order. And then (support balls 79a, 79
(b is a component of the same shape) Finally, the peripheral end portion 75c of the hole 75b is thermally caulked to prevent the support ball 79a from coming off.

FIG. 3 is a cross-sectional view of a main part orthogonal to the hole 75b of FIG. 2, and FIG. 4 is a plan view of the main part when viewed from the direction of arrow 79c of FIG. Each point A to D in FIG. 4 corresponds to each point A to D in FIG. Here, the rear end of the blade portion 79aa of the support ball 79a is received and regulated in the range of the depth A surface. For this reason, the support ball 79a is fixed to the support frame 75 by thermally caulking the peripheral end portion 75c.

The tip of the blade portion 79ba of the support ball 79b is received within the depth B plane. For this purpose, support balls 79
b is prevented from coming off from the hole 75b in the direction of arrow 79c by the charge spring force of the charge spring. When the assembling of the lens barrel is completed, the support ball 79b moves to the second position.
Received by the yoke 72. For this reason, although it does not come out of the support frame 75, the B surface is provided in the retaining area in consideration of the assemblability.

2 to 4, holes 75b in the support frame 75
Does not require a complicated inner diameter slide mold even when the support frame 75 is formed by molding, and can be molded by a simple two-part mold in which the mold is pulled out on the side opposite to the arrow 79c, so that dimensional accuracy can be set strictly accordingly. Like that.

Further, since the support balls 79a and 79b are the same parts, there is no assembly error, which is advantageous in parts management. In FIG. 1, for example, fluorine-based grease is applied to the bearing 75 d of the support frame 75, and an L-shaped shaft 711 (a non-magnetic stainless material) is charged, and the other end of the L-shaped shaft 711 is formed on the main plate 71. The bearing frame 71d (similarly coated with grease) is placed on the second yoke 72 together with the three supporting balls 79b, and the support frame 75 is housed in the base plate 71.

Next, the positioning hole 712 of the first yoke 712.
a (three places) are pins 71f of the main plate 71 (three places in FIG. 5)
To the first yoke 7 at the receiving surfaces 71e (five places).
12 and is magnetically coupled to the base plate 71 (the magnetic force direction 73a of the permanent magnet 73). Thereby, the first yoke 7
The rear surface of the base 12 is in contact with the support ball 79a, and the support frame 75 is sandwiched between the first yoke 712 and the second yoke 72 as shown in FIG.

Support balls 79a, 79b and first yoke 712
Fluorine-based grease is also applied to the contact surfaces of the first and second yokes 72, and the support frame 75 is freely slidable with respect to the base plate 71 in a plane orthogonal to the optical axis. The L-shaped shaft 711 has the support frame 75 with the arrows 713p, 7
It is supported so that it can slide only in the 13y direction,
This restricts the relative rotation (rolling) of the support frame 75 with respect to the base plate 71 about the optical axis.

The L-shaped shaft 711 and the bearings 71d and 75d
Is set to be large in the optical axis direction to prevent overlapping with the optical axis direction regulation by sandwiching the support balls 79a and 79b with the first yoke 712 and the second yoke 72. . The insulating sheet 7 is provided on the surface of the first yoke 712.
14 is covered with a plurality of ICs (position detecting element 7
8p, 78y, output amplification IC, coil (75p, 76y
y), a hard substrate 715 having a driving IC, etc.) is fitted in the positioning holes 715a (two places) with the pins 71h (two places in FIG. 5) of the base plate 71, and the holes 715b and the first yoke 71 are formed.
The second hole 712b and the hole 71g of the base plate 71 are screwed together.

Position detecting elements 78p and 78y are positioned on the hard board 715 by a tool and fixed by soldering. Flexible board 71 for signal transmission
6, the surface 716a is thermocompression-bonded to a region 715c surrounded by a broken line on the back surface of the hard substrate 715. Flexible board 71
6 and a pair of arms 716b in a plane direction orthogonal to the optical axis.
p and 716by extend, and are hooked on hook portions 75ep and 75ey of the support frame 75, respectively, as shown in FIG. 6, and the terminals of the IREDs 77p and 77y and the coils 76p and 76y.
The terminal of y is soldered.

As a result, IRED 77p, 77y and coil 7
6p and 76y are driven from the hard substrate 715 via the flexible substrate 716. The bent portions 7 are respectively provided on the arm portions 716bp and 716by of the flexible substrate 716.
16 cp and 716 cy are provided.
The arm 716b against the support frame 75 moving around in a plane orthogonal to the optical axis due to the elasticity of 16cp and 716cy.
The load of p, 716by is reduced.

The first yoke 712 has a protruding surface 712c formed by embossing, and the protruding surface 712c passes through the hole 714a of the insulating sheet 714 and is in direct contact with the hard substrate 715. On the hard board 715 side of this contact surface, a ground (GN
D; ground) pattern is formed, and the first yoke 71 is formed by screwing the hard substrate 715 to the ground plate 71.
Numeral 2 is grounded so that it does not act as an antenna to give noise to the hard substrate 715.

The mask 717 is positioned on the pin 71h of the base plate 71 and fixed on the hard substrate 715 with a double-sided tape. The base plate 71 has a through hole 71i for a permanent magnet, from which the back surface of the second yoke 72 is exposed. A permanent magnet 718 (lock magnet) provided on the yoke 727 is incorporated in the through hole 71i and magnetically coupled to the second yoke 72 (FIG. 2).

FIG. 7 is a schematic view of the lens barrel after assembly is viewed from the back side of FIG. The outer diameter cutouts 719c (three places in FIG. 8) of the lock ring (locking part) 719 are matched with the phases of the inner diameter projections 71j (three places) of the base plate 71, and the lock ring 719 is pushed into the base plate 71. 719 is turned in the unlocking direction (counterclockwise direction in the figure) to be bayonet-coupled to the main plate 71. As a result, the lock ring 719 is restrained in the optical axis direction with respect to the base plate 71, and is rotatable around the optical axis.

Then, the lock ring 719 rotates and the cutout portion 719c of the lock ring 719 is again projected.
Locking rubber (restricting member) 72 is used as an elastic member in order to prevent the bayonet connection from being disconnected in the same phase as j.
6 is provided on the main plate 71. This allows the lock ring 7
The rotation of the lock member 19 is restricted so that it can rotate only within the drive range (the angle θ ₀ of the notch 719d) controlled by the lock rubber 726.

That is, when the lock rubber 726 is not provided, the lock ring 719 has a wide driving range with respect to the main plate 71. This also connects the bayonet,
The bayonet connection can be released, but the lock rubber 72
6 is provided and the drive range is restricted to the angle θ ₀ , the outer diameter cutout portion 719c cannot rotate to the same phase as the inner diameter protrusion 71j, thereby preventing the bayonet from coming off.

Here, the lock rubber 726 is pressed into a hole (not shown) of the base plate 71 and is planted. The tilting direction of the lock rubber 26 is regulated by enclosing a substantially half circumference of the outer periphery by a rear surface protruding ear 71a of the base plate 71 and a convex portion around the screw hole (self-tapping hole) 71L with respect to the base plate 71. Further, the yoke 727 is screwed to the base plate 71 and the
A lock rubber 726 is sandwiched between the yoke 727 and the second yoke 72 to slightly charge the elasticity of the rubber, as shown in FIG. Thus, the lock rubber 726 is fixed to the base plate 71 without adding a screw or an adhesive.

Next, referring to FIGS. 9 and 10, the lock rubber 72
The contact position relationship between the lock ring 6 and the lock ring 719 and the drive range of the lock ring 719 will be described. 9 and 10
7 is a schematic view in which only essential parts are extracted from the plane part of FIG. 7, and the shape and layout are slightly changed from the actual assembled state for easy understanding.

FIG. 9 is a plan view showing a locked state. In the figure, the lock ring 719 is urged clockwise by a lock spring 728, but the lock rubber 726 is in contact with the side 719i of the lock ring 719 to prevent rotation.

Oil (silicone oil) 51 is applied to the contact surface (corresponding to the contact side 719i) between the lock rubber (restricting member) 726 and the lock ring (locking portion) 719. The oil and fat is applied to at least one of the contact surfaces of the lock ring 719 and the lock rubber 726.

In the present embodiment, the oil 51 is applied to the lock ring 7
It is provided on the 19th side. The oil 51 causes the contact surface between the lock ring 719 and the lock rubber 726 to be constantly in a lubricated state, so that the lock rubber 726 is locked by the lock ring 719.
Even if they are continuously pressed, the two do not stick to each other so that stable unlocking is always possible.
In addition, it is preferable to use neoprene rubber or NBR (nitrile brodiene rubber) as a street rubber as the lock rubber because the fixing force is further weakened.

The locking of the lock ring 719 is elastic because it is a rubber separate from the base plate 71, so that it absorbs the shock at the time of locking and does not generate a loud noise. Further, the contact side 719i of the lock rubber 726 has the coil 7
It is provided near 20. The vicinity of the coil 720 is a portion where the mass is concentrated in the lock ring 719, and has the largest inertial force when the lock ring 719 rotates.

When the hook 719e is turned off, the lock ring 719 is deformed because it is separated from the coil 720, and this deformation causes poor sound quality at the time of impact at the time of locking.
It becomes uncomfortable and the lock ring 719 is more likely to come off than the main plate 71 (because of the patchon connection). For this reason, in the present invention, the lock ring 719 is elastically detented in the vicinity of the coil 720 and has a buffering function. Is small and the sound quality is improved.

The bayonet connection is stronger than the patchon connection, and since the lock ring 719 is not deformed, the lock ring 719 does not come off from the main plate 71. The lock ring 719 is driven in the locking direction and the unlocking direction, but this driving is restricted, and a sound when the locking ring 719 is stopped is generated in both directions.

However, immediately before the end of the driving in the unlocking direction, the armature 724 is first moved to the suction yoke 72.
9 makes contact with a weak force (due to the elastic force of the armature spring 723), at which time a small metallic sound is produced, but thereafter, no sound is generated at the end of driving due to the elasticity of the armature spring 723. Further, since the above-mentioned metal sound is also generated in synchronization with the release operation of the photographer (when the image stabilizing system is turned on), the photographer has little discomfort. As described above, the sound generated when locking is reduced.

In this embodiment, as described above, the lock rubber 7
26 is provided so as to contact the lock ring 719 near the coil 720. As described above, in this embodiment, (A1) the lock ring 7 having the biasing spring in the locking direction.
19 (A2) Lock direction (clockwise direction) with respect to the main plate 71
(A3) Then, rotate it in the unlocking direction to connect the bayonet and lock it with the lock rubber.

By catching the above three structures, (B1) the lock ring can be stably coupled to the main plate with a simple bayonet retaining structure, and (B2) the noise generated at the time of locking can be suppressed. B3) Further, by disposing the lock rubber in the vicinity of the coil, the deformation of the lock ring is prevented and the sound quality generated at the time of locking is not deteriorated. And so on.

The lock rubber 726 according to the present invention is also characterized in that it serves as a stopper when the lock ring 719 is unlocked.

In FIG. 10, the lock ring 719 rotates in the unlocking direction and the armature 724 attracts the suction yoke 729.
It is a schematic diagram at the moment of contact with. At this time, the lock rubber 72
The clearance between the outer periphery of the lock ring 6 and the side 719j of the lock ring is θ ₂ , and the lock ring ear 719a and the armature 724
Is defined as φ (driving allowance for equalizing the armature 724 to the suction yoke 729), θ ₂ <φ.

[0046] That side 719j is not the state condition of FIG. 10 from (driving allowance the used-up state) when until the driving angle of the lock ring 719 and theta ₁ of theta ₁ -.phi in FIG 9 <θ ₀ <θ ₁ Have a relationship.

As a result, even if the lock ring 719 continues to be driven in the unlocking direction in the state of FIG. 10, it is better for the lock rubber 726 to elastically abut the side 719j than for the lock ring ear 719a to press the armature 724. Because of the speed, the armature 724 is reliably attracted to the attraction yoke 729.

As described above, the stopper is used to restrict rotation in both directions, and the stopper is formed by one elastic means, and the stopper is fixed only by being sandwiched between the parts of the member, and the stopper is the bayonet disconnection. Since the stopper is also used, the assembling workability is good, there is no unpleasant sound during operation, a stable mechanism and a locking device (locking device) that reliably operates are obtained.

The mechanical parts of the lens barrel described above are roughly classified into a lens 74, a support frame 75, and coils 76p and 76.
y, IRED 77p, 77y, support balls 79a, 79b, charge spring 710, and support shaft 711 constitute one element of an optical holding means (correction means) for eccentricizing the optical axis, and a main plate 71, a second yoke 72, and a permanent magnet 73. , The first yoke 712 constitutes one element of the supporting means for supporting the correcting means,
18, lock ring 719, coil spring 720, armature shaft 721, armature rubber 722, armature spring 723, armature 724, yoke 727, lock spring 728, suction yoke 729, suction coil 730
Constitutes one element of the locking means for locking the correction means. Armature 724, yoke 729, coil 730
Constitutes one element of the holding unit. Armature shaft 72
1. Armature rubber 722, armature spring 723
Constitutes one element of the equalizing means.

Next, returning to FIG. 1, I on the hard substrate 715
C731p and 731y are position detecting elements 78p and 78, respectively.
This is an IC for amplifying the output of y. FIG. 12 is an explanatory diagram of the internal configuration (ICs 731p and 731y have the same configuration.
Here, only the IC 731p is shown. ).

In the figure, the current-voltage conversion amplifier 73
1ap and 731bp are photocurrents 7 generated by the light projecting element 77p in the position detecting element 78p (comprising resistors R ₁ and R ₂ ).
8 _{i1 p} and 78 _{i2 p} are converted into voltage. Differential amplifier 7
31cp is each current-voltage conversion amplifier 731ap, 731
The difference output of bp is obtained and amplified.

Light emitted from the light projecting elements 77p and 77y enters the position detecting elements 78p and 78y via the slits 75ap and 75ay as described above. When the support frame 75 moves in a plane perpendicular to the optical axis, the position detection elements 78p,
The position of incidence on 78y changes. The position detecting element 78p has sensitivity in the direction of the arrow 78ap, and
ap is a direction orthogonal to the arrow 78ap (78ay direction).
The light beam spreads out in the direction of arrow 78ap, and the light beam is narrowed in the direction of arrow 78ap.

Therefore, only when the support frame 75 moves in the direction of the arrow _713p , the photocurrents 78 _i1p , 7 of the position detecting element 78p are _obtained .
The balance of 8 _i2p changes, and the differential amplifier 731 cp outputs according to the direction of the arrow 713 p of the support frame 75. The position detection element 78y has a detection sensitivity in the direction of the arrow 78ay,
The slit 75ay is in a direction (7
8 ap direction), the support frame 75 has an arrow 7
The position detection element 78y changes the output only when it moves in the 13y direction.

The addition amplifier 731dp obtains the sum of the outputs of the current-voltage conversion amplifiers 731ap and 731bp (total amount of light received by the position detection element 78p), and the drive amplifier 731ap receiving this signal drives the light projecting element 77p accordingly.

Since the light projection amount of the above-mentioned light projecting element 76p is extremely unstable and changes with temperature or the like, the absolute amounts 78 _i1p +78 _{i2p of the} photocurrents 78 _i1p and 78 _i2p of the position detecting elements 78p and 78y change accordingly. To do. Therefore, the differential amplifier 731c which is 78 _i1p −78 _i2p indicating the position of the support frame 75
The output of p also changes.

Therefore, as described above, the light emitting element 77p is controlled by the above-mentioned drive circuit so that the total amount of received light is constant, so that the output change of the differential amplifier 731cp is eliminated.

The coils 76p and 76y in FIG. 1 are permanent magnets 7.
3. The support frame 75 is located in a closed magnetic path formed by the first yoke 712 and the second yoke 72, and is driven in the direction of an arrow 713p by passing a current through the coil 76p. (Rule) By passing a current through the coil 76y, the support frame 75 is driven in the direction of the arrow 713y.

Generally, the outputs of the position detecting elements 78p and 78y are amplified by the ICs 731p and 731y, and when the coils 76p and 76y are driven by the outputs, the support frame 75 is driven to change the outputs of the position detecting elements 78p and 78y. Become. Here, when the driving direction (polarity) of the coils 76p and 76y is set to a direction in which the outputs of the position detecting elements 78p and 78y become smaller (negative feedback), the outputs of the position detecting elements 78p and 78y are substantially reduced by the driving force of the coils 76p and 76y. The support frame 75 is stabilized at the position where it becomes zero.

In this way, the output from the position detection elements 78p, 78y is negatively fed back for driving (herein referred to as a position control method). For example, a target value (for example, camera shake angle signal) is externally supplied to the ICs 731p, 731y. , The support frame 75 drives extremely faithfully according to the target value.

Actually, the differential amplifiers 731cp and 731c
The output of y is sent to the main substrate (not shown) via the flexible substrate 716, where analog-digital conversion (A / D conversion) is performed and the result is captured by the microcomputer. In the microcomputer, the signal is appropriately compared and amplified with a target value (camera shake angle signal), phase-compensated by a digital filter method (to make position control more stable), and then passed through the flexible substrate 716 again to the IC 732 (the coils 76p and 76).
y drive).

The IC 732 performs PWM (pulse width modulation) driving of the coils 76p and 76y based on the input signal,
The support frame 75 is driven. The support frame 75 is indicated by arrows 713p and 7
It is slidable in the 13y direction, and the position is stabilized by the position control method described above. Incidentally, in a consumer optical device such as a camera, the support frame 75 is always used from the viewpoint of preventing power consumption.
Is not controlled. Since the support frame 75 can freely move around in the plane orthogonal to the optical axis in the non-controlled state, the following measures should be taken against the sound generation and damage of the collision at the stroke end at that time. ing.

As shown in FIGS. 6 to 10, three protrusions 75f radially protruding are provided on the back surface of the support frame 75, and the tips of the protrusions 75f are mechanical lock rings 719 as shown in FIG. 7 or FIG. Is fitted to the inner peripheral surface 719g. Thus, the support frame 75 is restrained in all directions with respect to the main plate 71.

FIG. 13 is a timing chart of the mechanical lock ring drive, in which the coil 720 is energized by the arrow 719i (PWM drive shown by 720b) and the attraction magnet 730 is also energized (730a). Therefore, the armature 724 abuts the suction yoke 729, and when the armature 724 is equalized, the armature 724 is sucked by the suction yoke.

Next, when the power supply to the coil 720 is stopped at the time point 720c, the lock ring 719 is locked by the lock spring 72.
Attempts to rotate clockwise with the force of 8, but as described above, the rotation is restricted because the armature 724 is adsorbed by the adsorption yoke 729. At this time, the projection 7 of the support frame 75
5f is located at a position facing the cam 719f (the cam 719).
f rotates), the supporting frame is composed of the projection 75f and the cam 71.
It becomes possible to move by the clearance between 9f.

Therefore, the support frame 75 drops in the direction of the gravity G, but the support frame 75 is also brought into the control state at the time of the arrow 719i in FIG. 13, so it does not drop. The support frame 75 is restrained by the inner circumference of the lock ring 719 during non-control, but actually has a play corresponding to the fitting play between the projection 75f and the inner peripheral wall 719g. In other words, the support frame 75 falls downward in the direction of gravity by the amount of the play, and the center of the support frame 75 and the center of the main plate 71 are shifted. Therefore, from the time of the arrow 719i, for example, control is performed to spend one second and slowly move to the center of the main plate (the center of the optical axis).

When this is suddenly moved to the center, the lens 7
This is because it is uncomfortable for the photographer to feel the image swaying through 4 and to prevent image deterioration due to the movement of the support frame 75 even if exposure is performed during this time (for example, in 1/8 second). The support frame is moved by 5 μm). Specifically, arrow 719i
The outputs of the position detecting elements 78p and 78y at the time are stored,
The control of the support frame 75 is started with the value as a target value, and then spent for one second, and moves to the target value at the time of the preset optical axis center (75 g). After the lock ring 719 is rotated (unlocked state), the support frame 75 is driven based on the target value from the vibration detection means (overlapping with the above-described movement of the center position of the support frame) to start the image stabilization. become.

Here, if the image stabilization is turned off at the time of arrow 719j to end the image stabilization, the target value from the vibration detection means is not input to the present apparatus, and the support frame 75 is controlled to the center position and stops. At this time, the power supply to the suction coil 730 is stopped (730b). Then, the suction force of the armature 724 of the suction yoke 729 is lost, and the lock ring 719 is rotated clockwise by the lock spring 728 to return to the state of FIG. At this time, the lock ring 719 becomes the stopper pin 7
The rotation is regulated by abutting against 26. After that (eg 20ms
After ec) The control of the present device is cut off, and the timing chart of FIG. 13 ends.

FIG. 14 is a block diagram showing the outline of the image stabilization system. In FIG. 14, reference numeral 91 is a vibration detection means, which is composed of a shake detection sensor for detecting an angular velocity of a vibration gyro and the like, and a sensor output calculation means for cutting the DC component of the shake detection sensor output and then integrating it to obtain an angular displacement. It

The angular displacement signal from the vibration detecting means 91 is input to the target value setting means 92. This target value setting means 9
2 is a variable differential amplifier 92a and a sample hold circuit 92
Since the sample-hold circuit 92b is always sampling, the two signals input to the variable differential amplifier 92a are always equal and the output is zero. However, when the sample-and-hold circuit 92b is put into a hold state by an output from a delay unit 93, which will be described later, the variable differential amplifier 92a starts outputting continuously with the time being zero.

The amplification factor of the movable differential amplifier 92a is variable by the output of the image stabilization sensitivity setting means 94. The reason is that the target value signal of the target value setting means 92 is a target value (command signal) for causing the correction means to follow, but the correction amount of the image plane (the image stabilization sensitivity) with respect to the driving amount of the correction means is zoom and focus. This is to compensate for the change in the image stabilization sensitivity because it changes depending on the optical characteristics based on the change in focus. Therefore, the image stabilization sensitivity setting unit 94 receives the zoom (focal length) information from the zoom information output unit 95 and the focus (distance) information based on the distance measurement information of the exposure preparation unit 96, and the image stabilization based on the information. The sensitivity is calculated or the image stabilization sensitivity information preset based on the information is extracted to change the amplification factor of the variable differential amplifier 92a of the target value setting means 92.

The correction driving means 97 are ICs 731p, 731y732, etc. mounted on the hard board 715, and the target value from the target value setting means 92 is input as a command signal. The correction starting means 98 is provided for the IC 7 on the hard board 715.
32 is a switch that controls the connection between the coil 32 and the coils 76p and 76y. Normally, by connecting the switch 98a to the terminal 98c, both ends of the coils 76p and 76y are short-circuited, and the signal of the logical product means 99 is output. Is input, the switch 98a is connected to the terminal 98b, and the correction unit 910 is in the control state (the shake correction is not performed yet, but the coils 76p,
Power is supplied to 76y, and the correcting means 910 is stabilized at a position where the signals of the position detecting elements 78p and 78y become substantially zero.)

At the same time, the output signal of the logical product means 99 is also input to the locking means 914, whereby the locking means unlocks the correction means 910. The correction means 910 inputs the position signals of the position detecting elements 78p and 78y to the correction driving means 97, and performs the position control as described above. When both signals of the release half-press SW1 signal of the release means 911 and the output signal of the image stabilization switching means 912 are input to the logical product means 99, the AND gate 99a as a component thereof outputs a signal. That is, the anti-shake switching means 9
When the photographer operates the image stabilization switch 12 and presses the release halfway with the release means 911, the correction means 91
0 is unlocked and enters the control state.

The SW1 signal of the release means 911 is input to the exposure preparation means 96, which performs photometry, distance measurement, and lens focusing drive, and outputs focus information to the image stabilization sensitivity setting means 94 as described above. The delay unit 93 receives the output signal of the AND unit 99 and outputs it one second later, for example, and causes the target value setting unit 92 to output the target value signal as described above.

Although not shown, the vibration detecting means 91 also starts to operate in synchronization with the SW1 signal of the release means 911. As described above, a sensor output calculation including a large time constant circuit such as an integrator requires a certain period of time from startup to a stable output. The delay means 93 is the vibration detection means 9
After waiting until the output of the first signal is stabilized, the correcting means 910
The vibration detection means 91 plays the role of outputting a target value signal to the
The image stabilization is started after the output of is stabilized.

The exposure means 913 performs mirror up by the release push-off SW2 signal input of the release means 911, opens and closes the shutter at the shutter speed obtained based on the photometric value of the exposure preparation means 96, and exposes the mirror down. Then, the shooting ends. After the photographing is completed, when the photographer releases his hand from the release unit 911 and turns off the SW1 signal, the AND unit 99 stops the output, and the sample and hold circuit 92b of the target value setting unit 92 enters a sampling state.
The output of the variable differential amplifier 92a becomes zero. Therefore, the correction means 910 returns to the control state in which the correction driving is stopped.

Since the output of the logical product means 99 is turned off, the locking means 914 locks the correction means 910, and then the switch 98a of the correction starting means 98 is connected to the terminal 98c and the correction means 910 is controlled. It will not be done. The vibration detecting means 91 is operated by a timer (not shown).
The operation continues for a certain period of time (for example, 5 seconds) after the operation 1 is stopped, and then stops. This is because the photographer frequently performs the release operation after stopping the release operation, and in such a case, it is possible to prevent the vibration detection unit 91 from being activated every time, and to shorten the standby time until the output is stabilized. When the vibration detecting means 91 has already been started, the vibration detecting means 91 sends a started signal to the delay means 93 to shorten the delay time.

As described above, in this embodiment, the locking portion (lock ring 719) of the locking means is bayonet-coupled with the ground plate 71 of the ground plate portion (supporting means), and the locking portion (lock ring 719) is locked. Turn in the direction (locking direction)
1 is inserted, rotated in the unlocking direction (unlocking direction) to join the bayonet, and the elastic means (lock rubber 726) prevents the bayonet from coming off, resulting in good assembly.
A stable locking device with low operating noise is obtained.

Further, when the mass of the locking portion (lock ring 719) is concentrated (electromagnetic driving means for driving the locking portion: coil 720) is received by the limiting member (lock rubber 726), it is generated during operation. A stable locking device is obtained by preventing deterioration of sound quality and deformation of the locking portion (lock ring 719) during operation. In addition, since the limiting means (lock rubber 726) is fixed by being sandwiched between the fixing part (support means: second yoke 72) and the electromagnetic driving means (yoke 727) for driving the locking part, the assembling workability is improved. I have a good locking device.

Further, by restricting the driving range of the locking portion (lock ring 719) in both the locking direction (locking direction) and the non-locking direction (unlocking direction), a reliable locking and unlocking operation is performed. In particular, the holding portion (the armature 724 (iron piece), the attraction yoke 729 (electromagnet), the attraction coil 730, which holds the locking portion (lock ring 719) in the unlocked state (unlocked state) can be realized. (Equipment) to reduce the drive allowance of the locking portion (lock ring 719) for operating the equalizing means (armature shaft 721, armature rubber 722, armature spring 723) for adjusting the contact positions of the iron piece and the electromagnet. A good locking device is obtained by elastically restricting the drive range of the locking portion in the direction by the elastic portion (lock rubber 726).

An optical image including the above-mentioned lens barrel is used to form an object image (image) on a predetermined surface (photosensitive surface).

[0081]

According to the present invention, by setting each element as described above, an optical holding means holding an optical element such as a lens or a prism, for example, an optical holding means holding an optical element for image stabilization ( When the correction device is suitable for an image stabilization system that corrects image shake due to vibration by accurately sliding the correction device in a plane orthogonal to the optical axis based on a signal from the vibration detection device, lock (locking) of the image stabilization function is performed. Thus, it is possible to achieve a lens barrel and an optical device using the lens barrel that can be smoothly unlocked (unlocked).

In particular, according to the present invention, the rotation range of the rotation operation of the locking portion for locking / unlocking the driving of the optical holding means is limited to the locking portion when the restriction member abuts on the rotation range. By applying oil and fat to the contact surface with the member, it is possible to weaken the mutual fixing force and perform locking and unlocking with high reliability.

[Brief description of drawings]

FIG. 1 is a perspective view of a part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a part of FIG. 1;

FIG. 3 is an explanatory view of a part of FIG. 2;

FIG. 4 is a plan view of an essential part when viewed from a direction of an arrow 79c in FIG. 3;

FIG. 5 is a perspective view of a main part of a part of FIG. 1;

FIG. 6 is a perspective view of a main part of a part of FIG. 1;

FIG. 7 is a plan view of a main part of a part of FIG. 1;

FIG. 8 is a perspective view of a main part of a part of FIG. 1;

FIG. 9 is a plan view of a main part of a part of FIG. 1;

FIG. 10 is a plan view of a main part of a part of FIG. 1;

FIG. 11 is a sectional view of a main part of a part of FIG. 1;

FIG. 12 is an explanatory diagram of Embodiment 1 of the present invention.

FIG. 13 is an explanatory diagram of Embodiment 1 of the present invention.

FIG. 14 is a block diagram of a main part of the first embodiment of the present invention.

FIG. 15 is a perspective view of a main part of a conventional lens barrel.

[Explanation of symbols]

 71 Base plate (supporting means) 72 Second yoke 73, 718 Permanent magnet 712 First yoke 719 Lock ring (locking part) 727 Yoke 75 Supporting frame (optical holding means) 726 Elastic means (restricting member) 51 Oil and fat

Claims (4)

[Claims] 1. An optical holding means for holding an optical element and driving the optical element in a direction orthogonal to an optical axis is drivably mounted on a supporting means fixed in a lens barrel, and is not engaged or disengaged with the driving of the optical holding means. The locking is performed by rotating the locking portion, and the rotation range of the locking portion is restricted by abutting on a part of the limiting member, and the contact surface between the locking portion and the limiting member is limited. A lens barrel characterized by being coated with oil and fat. 2. An optical holding means for holding an optical element and driving it in a direction orthogonal to the optical axis is drivably mounted on a support means fixed in a lens barrel, and is not engaged with the driving lock of the optical holding means. A locking means for selectively stopping the locking according to the rotation direction of the rotation operation of the locking portion is coupled to the support means, and the rotation range of the locking portion is between the support means and the locking portion. A lens barrel is characterized in that the limiting member is limited by abutting on a part of the limiting member, and oil is applied to the contact surface between the locking portion and the limiting member. 3. An optical holding means for holding an optical element and driving it in a direction orthogonal to the optical axis is drivably mounted on a supporting means fixed in a lens barrel, and is not engaged with the driving lock of the optical holding means. Locking means for selectively stopping the locking portion in accordance with the rotation direction of the rotation operation of the locking portion is coupled to the supporting means, and the drive range of the locking portion is brought into contact with a part of the limiting member to limit the driving range. A lens barrel is characterized in that the contact surface between the locking portion and the limiting member is coated with oil and fat. 4. An optical apparatus, wherein an image is formed on a predetermined surface by using the lens barrel according to any one of claims 1 to 3.