JP4684459B2 - Lens device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a lens apparatus suitable for a video camera or the like having a vibration isolation system.
[0002]
[Prior art]
Lenses used in current video cameras are more susceptible to various vibrations when using the photographic device on the telephoto side as the basic optical performance increases in magnification and performance. It has come to be equipped with a shake prevention function that reduces the influence of vibration.
[0003]
Here, a system for preventing vibrations that affect shooting will be briefly described.
[0004]
When shooting with a video camera, it is usually attached to a tripod or pedestal because it is a large equipment system, or it is used on the shoulder. On the other hand, in an environment where a video camera is installed, vibrations generated by the influence of wind and heavy objects are a problem. Therefore, the frequency band that affects photographing is between 1 Hz and 20 Hz.
[0005]
As shown in Japanese Patent Application Laid-Open No. 09-269519, etc., as a basic concept for enabling shooting without influence on a shot image even when receiving such vibration during shooting with a video camera, The vibration of the lens due to vibration must be detected, and the correction lens must be displaced according to the detected value. Therefore, it is necessary to accurately detect the vibration applied to the video camera and correct the change of the optical axis due to the influence.
[0006]
In principle, this vibration is detected by vibration detection means for detecting angular acceleration, angular velocity, angular displacement, and the like, and vibration detection means for outputting angular displacement obtained by integrating the output signals of the vibration detection means. This is possible by mounting the lens device. Then, by driving a correction optical device that decenters the optical axis based on this detection information, image blur can be suppressed.
[0007]
Here, the outline of the image stabilization system using the vibration detection means will be described with reference to FIG.
[0008]
The example of FIG. 23 is a diagram of a system that suppresses image blur due to the vertical shake 101P and the horizontal shake 101Y in the direction indicated by the arrow 101.
[0009]
In the figure, reference numeral 102 denotes a lens barrel, and 103P and 103Y denote vibration detection means for detecting a video camera longitudinal vibration and a video camera lateral vibration, respectively, and the respective vibration detection directions are indicated by 104P and 104Y. Reference numeral 105 denotes a correction optical device (106P and 106Y are actuators that apply thrust to the correction optical device 105, and 107P and 107Y are position detection elements that detect the position of the correction optical device). A control loop is set and driven by using the outputs of the vibration detection means 103P and 103Y as a target value, and a stable image on the imaging plane 108 is realized.
[0010]
FIG. 24 is an exploded perspective view showing the structure of the correction optical device used for the above-mentioned purpose. This structure will be described with reference to FIG. 24 and FIGS. 25 to 30 showing details of each part.
[0011]
The projecting edge 111a of the vibration isolator housing 111 is abutted and fixed to a lens barrel (not shown) by a screw passing through the hole 111b.
[0012]
The first yoke 112, which is a magnetic body and is plated with gloss, is screwed into the hole 111 c of the vibration isolator housing 111. Further, a permanent magnet (shifting magnet) 113 such as a neodymium magnet is magnetically attracted to the first yoke 112.
[0013]
Coils 116P and 116Y are screwed and fixed to a support frame 115 (enlarged view in FIG. 26) to which the correction lens 114 is coupled as a unit, and light projecting elements 117P and 117Y such as an IRED are also provided on the back surface of the support frame 115. The emitted light is incident on position detection elements 118P and 118Y such as PSDs to be described later through slits 115aP and 115aY.
[0014]
  As shown in FIG. 27, a sliding member 119a such as a bearing is fixed to the fixed shaft 119b via a retaining washer 120 on the support frame 115. The sliding member 119a includes, for example, a fluorine-based member. Applying grease, the L-shaped plate material 121 is fitted into the fitting groove 121a (FIG.See) inserted at position.
[0015]
In the L-shaped plate member 121, a sliding member 122a such as a bearing is not shown on the fixed shaft 122b so as not to come off in a direction perpendicular to the sliding member 119 provided on the support frame 115 and the optical axis. The sliding member 122 is fixed with a washer, and fluorine grease is applied to the sliding member 122 and inserted into the fitting groove 111d provided in the vibration isolator casing 111.
[0016]
Further, support balls 124 (see FIG. 27) such as hard balls are inserted into the three holes 121b provided on the support frame 115 side of the L-shaped plate member 121 with fluorine-based grease applied thereto, The vibration isolator casing 111 is also provided with three holes 111e, and the support balls 124 are similarly inserted with fluorine-based grease applied thereto.
[0017]
In this way, the L-shaped plate 121 is housed in the optical axis direction with no backlash between the support frame 115 and the vibration isolator housing 111 by the support balls 124 described above.
[0018]
Further, fluorine-based grease is also applied to the contact surfaces of the support ball 124, the vibration isolator housing 111 and the support frame 115, and the support frame 115 is aligned with the optical axis with respect to the vibration isolator housing 111. It can slide freely in an orthogonal plane.
[0019]
Next, the second yoke 125, which is magnetic and gloss-plated, is fixed to the hole 111f of the vibration isolator housing 111 by screws as in the first yoke 112. Similar to the first yoke 112, a permanent magnet (shifting magnet) 126 such as a neodymium magnet is magnetically attracted to the second yoke 125.
[0020]
On the other hand, back protrusions 115b (three places) of the support frame 115 are arranged in long grooves (three places, not shown) provided in the vibration isolator housing 111 in a direction perpendicular to the optical axis of the photographing apparatus. The support frame 115 is positioned with respect to the optical axis of the photographing apparatus without causing any other tilt, and freely slides in a plane perpendicular to the optical axis of the photographing apparatus. It is possible to do.
[0021]
Therefore, the L-shaped plate member 121 supports the support frame 115 with respect to the vibration isolator housing 111 so as to be slidable only in the directions of arrows 127P and 127Y. The relative rotation (rolling) around the optical axis with respect to the vibration isolator housing 111 is restricted.
[0022]
The vibration isolator casing 111 is screw-coupled with substrates 128P and 128Y on which position detecting elements 118P and 118Y are mounted.
[0023]
FIG. 28 is a plan view of the correction optical device of FIG. 24 as seen from the back, and FIG. 29 is a cross-sectional view of the main parts around the gear of FIG.
[0024]
In these drawings, the lock ring 129 is fitted to the outer periphery 111h of the vibration isolator housing 111, and the lock ring 129 is fixed in the position in the optical axis direction by the presser ring 130, and around the optical axis. It is assembled so that it can rotate.
[0025]
The lock ring 129 has a cam protrusion 129a (a cam protrusion 129a (three places, see FIG. 24, FIG. 26) provided so as to mesh and charge in a rotational direction with a cam protrusion 115c provided on a rear protrusion ear 115b of the support frame 115. 3), and the support frame 115 is abutted and fixed at the cam projections by the lock ring 129, so that there is very little misalignment with the optical axis of the lens device. It has a structure.
[0026]
A lock spring 131 is hung on the hook 129b (see FIG. 30) of the lock ring 129 and the hook 111i provided on the vibration isolator housing 111, and urges the lock ring 129 in the clockwise direction. .
[0027]
A gear 129c having a predetermined specification is cut around the lock ring 129, and the gear 129c is connected to a gear train 132 (consisting of gears 132a, 132b, and 132c), for example, an electromagnetic clutch. Such a switching joint mechanism 133 is connected.
[0028]
A gear 134 such as a worm gear is provided on the shaft of the switching joint mechanism 133 opposite to the gear train 132, and a motor 135 having a predetermined gear head is connected to the gear 134.
[0029]
The mechanism part of the correction optical device described above is roughly divided into three elements: a correction unit that decenters the optical axis, a support unit that supports the correction unit, and a locking unit that locks the correction unit. ing.
[0030]
The correction means is assembled by a correction lens 114, a support frame 115, coils 116P and 116Y, IREDs 117P and 117Y. The support means is assembled by the vibration isolator housing 111, the first yoke 112, the permanent magnets 113 and 126, the second yoke 125, the support ball 124, and the L-shaped plate material 121. The locking means is assembled with a lock ring 129, a cam projection 115c, and the like.
[0031]
The coils 116P and 116Y shown in FIG. 24 are positioned in a closed magnetic path formed by the permanent magnets 113 and 126, the first yoke 112, and the second yoke 125, and the current is passed through the coil 116P, so that the support frame 115 is shown in FIG. The support frame 115 is driven in the direction of the arrow 127Y by passing a current through the coil 116Y (in accordance with the known Fleming left-hand rule).
[0032]
In general, when the outputs of the position detection elements 118P and 118Y are respectively amplified by ICs on a hard substrate (not shown) and the coils 116P and 116Y are driven by the outputs, the support frame 115 is driven, The output of the position detection elements 118P and 118Y changes.
[0033]
Here, when the driving direction (polarity) of the coils 116P and 116Y is set to a direction in which the output of the position detection elements 118P and 118Y is reduced, the output of the position detection elements 118P and 118Y is coarsely driven by the driving force of the coils 116P and 116Y. The support frame 115 is stabilized at the position where it becomes zero.
[0034]
When a control system using a predetermined target value is constructed by a known position control method as described above, the support frame 115 is driven very faithfully according to the target value.
[0035]
As described above, the support frame 115 is slidable in the directions of the arrows 127P and 127Y, and the position is stabilized by the above-described position control method. However, from the viewpoint of power consumption of the video camera system, the support frame 115 is always provided. There is no reason to control
[0036]
In addition, since the support frame 115 moves freely in a plane orthogonal to the optical axis in the non-control state, noise and damage due to a collision at the end of the movable range area must be taken into consideration.
[0037]
As shown in FIGS. 24 and 26, the back surface of the support frame 115 is provided with three cam protrusions 115c that project radially, and as shown in FIG. 28, the cam protrusion 115c of the support frame 115 and the rotation direction The lock ring 129 is provided with a cam projection 129a so as to be in contact with the lock ring 129. Therefore, the support frame 115 is restrained in all directions with respect to the vibration isolator housing 111.
[0038]
30 (a) and 30 (b) are plan views showing the relationship of a series of locking operations between the lock ring 129 and the support frame 115, and only the main part is extracted from FIG.
[0039]
As shown in FIG. 30 (a), a gear train 132 (132a, 132b, 132c) provided to transmit a predetermined rotational torque is connected to a switching joint mechanism 133 (see FIG. 29) such as an electromagnetic clutch, A worm gear 134 is provided on the shaft 133 a (see FIG. 29) on the opposite side of the gear train 132 of the switching joint mechanism 133. A lock ring driving motor 135 is attached via the worm gear 134.
[0040]
The lock ring driving motor 135 is set so as to rotate in a direction in which the urging of the support frame 115 by the lock ring 129 is released when energized. As a result, the lock ring 129 is rotated by the lock spring 131. It rotates against the spring force.
[0041]
The lock ring 129 is provided on the cam ring 115c provided on the support frame 115 and the lock ring 129 as described above by the spring force of the lock spring 131 before the lock ring driving motor 135 is energized. The cam protrusions 129a are in contact with each other and are stable (state shown in FIG. 30A).
[0042]
FIG. 30B shows a positional relationship (unlocked state) where the lock ring 129 has rotated by a predetermined rotation angle and stopped.
[0043]
FIG. 31 is a timing chart for driving the lock ring 129.
[0044]
In response to the anti-vibration ON (ISON) indicated by the arrow 136a in FIG. 31, the coils 116P and 116Y are energized simultaneously with the energization of the switching joint mechanism 133, and the control for holding the support frame 115 at the center of the optical axis (so-called electrical To lock). Thereafter, energization of the lock ring driving motor 135 is started, and the lock ring 129 is rotated to release the mechanical lock (FIG. 30 (a) → (b)).
[0045]
Next, when the energization of the lock ring driving motor 135 is stopped at the time indicated by 136b, the lock ring 129 tries to reversely rotate by the force of the lock spring 131, but the worm gear 134 of the known switching joint mechanism 133 and the lock ring drive The rotation of the lock ring 129 is restricted by a reverse rotation prevention mechanism for meshing with the motor 135. At this time, the cam protrusion 129a of the lock ring 129 is located away from the cam protrusion 115c of the support frame 115 by a clearance generated by a predetermined rotation angle, and the support frame 115 is a cam of the support frame 115. A movable range is set by the clearance between the protrusion 115c and the cam protrusion 129a of the lock ring 129 (see FIG. 30B).
[0046]
For this reason, the support frame 115 falls in the direction of gravity G. However, since the support frame 115 is controlled by the timing of energizing the coils 116P and 116Y as described above, it does not fall.
[0047]
For example, when the lock ring 129 is released, if the control for maintaining the support frame 115 at the center of the optical axis is not performed, the support frame 115 is moved by the action of gravity during a certain time when the control starts to work. As a result, when the control is started, the support frame 115 moves so as to suddenly return to the target value (a position that is maintained at the center of the optical axis until the start of image stabilization).
[0048]
This phenomenon must be avoided because the photographer perceives the movement of the correction lens 114 as a shake of the image when shooting with the video camera, and therefore has to be avoided. Therefore, the unlocking operation of the lock ring 129 is necessary. Before starting, control (electrical lock) is performed to maintain the support frame 115 at the center of the optical axis.
[0049]
The support frame 115 is constrained by the cam protrusion 129a of the lock ring 129 when not controlled, and the light determined by the combination of the optical axis center determined by the mechanical constraint thus determined and the entire optical system of the lens device. Although it is configured so that the position of the axis center matches, this is also to eliminate the uncomfortable feeling caused by the movement of the optical axis center before and after the start of the control.
[0050]
After the lock ring 129 is rotated by a predetermined rotation angle (unlocked state), the support frame 115 is driven based on the target value from the vibration detecting means, and vibration isolation starts.
[0051]
Here, if the image stabilization is turned off (IS OFF) at the point of the arrow 136c to end the image stabilization, the target value from the vibration detection unit is not input to the correction unit, and the support frame 115 is controlled to the optical axis center position. Stop. At this time, the energization to the switching joint mechanism 133 is stopped. Then, the lock ring 129 is rotated by the lock spring 131 and returns to the state of FIG.
[0052]
Thereafter, the control to the correction means is cut off, and the timing chart of FIG. 31 ends.
[0053]
FIGS. 32 and 33 are flowcharts when the above-described series of image stabilization control operations are processed by the microcomputer, and will be briefly described below with reference to FIG.
[0054]
When the video camera is turned on (YES in # 5001), the microcomputer first checks the state of the image stabilization power switch (# 5002). Control is started to fix the center of the optical axis to the optical axis center position (# 5003). At the same time, energization of the switching joint mechanism is started (# 5004).
[0055]
Next, in order to enable anti-vibration control by the correction means, energization of the lock ring release motor is started as an anti-vibration preparation operation (hereinafter also referred to as anti-vibration pre-operation) (# 5005), and the lock ring is engaged. Rotate to the stop release position, release the locking of the correction means (# 5006), and further start shake detection (# 5007).
[0056]
Next, it is determined whether or not the anti-vibration main operation signal switch (alternate type or momentary type) is turned on (# 5008). If not, the correction means is electrically fixed at the optical axis center position. If the state as it is is kept and it is on (YES in # 5008), the image stabilization control is started by driving the correction means based on the target value signal (# 5009).
[0057]
As long as the anti-vibration main operation switch is on, the anti-vibration control is always working, and when shooting a video camera, you can shoot an image with anti-vibration effect by operating the video shooting switch in this state. Yes (# 5010 to # 5012 in FIG. 33). When the image stabilization main operation switch is turned off (YES in # 5013), the image stabilization control is stopped, and the correction means is electrically fixed at the center of the optical axis (# 5014).
[0058]
Further, when the anti-vibration power switch is turned off (YES in # 5015), the switching joint mechanism is de-energized (# 5016), and the correction means is locked at a predetermined position (# 5017). At this time, the position fixing control of the correcting means is finished (# 5018), and then the shake detection (driving of the vibration detecting means) is stopped (# 5019). Thereafter, the steps of FIG. 32 are performed until the power of the video camera is not turned off. Returning to # 5002, the vibration isolating pre-operation switch is turned on. When the video camera is turned off, this flow ends (# 5020).
[0059]
[Problems to be solved by the invention]
In the anti-vibration system described above, the mechanism such as the locking means for locking the correction means has the following problems.
[0060]
The video camera's shooting situation with a lens equipped with a vibration isolator having a correction means is different from the situation where the locking of the correction means is frequently switched, such as a consumer vibration isolator. Since the means for locking the means are limited, there are roughly three problems with the lock ring driving motor provided only for releasing the locking of the correction means.
[0061]
First, the lenses equipped with anti-vibration devices for today's video camera photography are not only equipped with anti-vibration functions, but also have many functions such as high-speed zooming, focusing functions and zoom position preset functions. Because of the progress of computerization, regulations such as current limit values are severe in order to establish all functions based on a limited power source. That is, in situations where power supply is limited, such as when shooting outdoors, the use of a lock ring driving motor that is used only for driving the lock ring is significantly disadvantageous.
[0062]
Secondly, when such an anti-vibration device is applied to a lens that is also restricted by the weight and size for outdoor photography, the size of the lock ring driving motor itself is disadvantageous.
[0063]
Thirdly, when the correction unit itself has a relatively heavy lens, the lock ring driving motor is required to have a specification that satisfies the torque required to rotate the lock ring, resulting in high cost. Can be mentioned.
[0064]
(Object of invention)
The first object of the present invention is to eliminate the power consumption of the driving mechanism required for unlocking the correction means, to make the allocation of the power consumption of the power source accompanying the multi-functionalization of the lens device, and to miniaturization. Therefore, an object of the present invention is to provide a lens device capable of reducing the cost.
[0065]
A second object of the present invention is to provide a lens device that can prevent discomfort associated with a delay in releasing the locking of the correcting means by the locking means and failure of imaging.
[0066]
The third object of the present invention is to provide a lens device that can improve the operability of the image stabilization pre-operating means and realize further power saving.
[0067]
A fourth object of the present invention is to ensure that the correction means is securely locked even if the power supply to the lens device is cut off or the lens device is inadvertently removed from the main body device that receives the power supply. It is an object of the present invention to provide a lens device that can hold and prevent damage to the correction means due to disturbance vibration.
[0068]
A fifth object of the present invention is to provide a lens device capable of easily performing an operation of setting a vibration isolation system to an inactive state during use of the lens device.
[0070]
[Means for Solving the Problems]
  In order to achieve the first object,The lens device of the present invention isCorrection means for correcting shakeWhen, Comprising locking means for locking the correction means,By driving the correction meansIn a lens apparatus including an image stabilization system that performs shake correction and an image stabilization pre-operation unit for setting the image stabilization system in an image stabilization preparation state, the image stabilization pre-operation unit includes a manual operation member and the manual operation. In conjunction with the operation of the member, the locking means,A drive mechanism that holds the unlocking state from the locked state to the unlocked state.A range of play is provided in the operation range of the manual operation member until the correction means in the locked state is set to the unlocked state, and the drive mechanism is operated within the range of play. And a first switch for starting control to electrically fix the correction means to the optical axis center of the optical system of the lens apparatus.It is characterized by that.
[0071]
  In order to achieve the second object,The lens device of the present invention isA range of play is provided in the operation area of the manual operation member until the correction means in the locked state is set to the unlocked state, and is turned on to operate the drive mechanism within the range of play. And a first switch for starting control to electrically fix the correction means to the optical axis center of the optical system of the lens apparatus.A lens device is desirable.
[0072]
  In order to achieve the third object,The lens device of the present invention isHolding means for holding a vibration-proof preparation state for maintaining the unlocking state of the correction means by the locking means, and the manual operation member until the correction means in the locked state can be set to the unlocked state And a second switch that is turned on at the time of operating and operates the holding means.It is desirable to make it.
[0073]
  In order to achieve the fourth object,The lens device of the present invention isThe second switch is turned off by operation of the manual operation member for bringing the correction means in the unlocked state into a locked state, and the electromagnetic clutch is turned off by turning off the second switch. It is assumed that the unlocking state of the correction means by the locking means cannot be maintained due to a non-energized state.It is desirable.
[0075]
  In order to achieve the fifth object,Lens device of the present inventionIs provided with an electromagnetic clutch in the holding means, and when the third switch is operated, the electromagnetic clutch deactivates the holding means and maintains the unlocking state of the correction means by the locking means. And stop the locking meansIt is desirable.
[0077]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments.
[0078]
1 to 8 are diagrams according to a first embodiment when the present invention is applied to a lens apparatus, and FIGS. 1 to 3 illustrate main portions of a vibration isolator and a locking means in the lens apparatus. Excerpted configuration diagram, more specifically, FIG. 1 is a lateral view of the locking means and the vibration isolator (however, the configuration has been changed to facilitate visual recognition), FIG. (B) is a view from the direction A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 4 and 5 are flowcharts showing the operation in the first embodiment of the present invention, and FIG. 6 is one of the components of the anti-vibration pre-operating means for preparing and starting the anti-vibration device. FIG. 7 and FIG. 8 are configuration diagrams showing a layout of a certain vibration isolating lever 1 in a lens apparatus. FIGS. 7 and 8 are image stabilization main switches 27 as an example of a vibration isolating main operation means for switching the vibration isolating operation in the lens apparatus. 2 is a configuration diagram illustrating a layout in the entire lens system and the imaging system.
[0079]
The anti-vibration pre-operating means in the first embodiment of the present invention is configured as follows. The anti-vibration lever 1 is directly connected to the shaft 2 by three screws, and the shaft 2 is supported by bearing plates 6a and 6b by holding plates 4 and 5 fixed to the locking device housing 3. Yes.
[0080]
Further, as shown in FIGS. 1 and 3, a two-sided handle 9 (see FIG. 1) is provided on the opposite side of the shaft 2 from the anti-vibration lever-1, and this position is provided in an anti-vibration system described later. Rigidity with respect to the force applied in the rotation direction by the set screw 10 and the gear 8a in the gear train 8 comprising the gear ring 8a, the gear 8b, and the gear 8c provided at a predetermined damping ratio with the lock ring 7 provided. Directly connected to keep.
[0081]
The gear 8b is fixed to a shaft screw 11 provided on the holding plate 4 by a retaining washer 12, and the gear 8c is also an electromagnetic clutch fixed to the holding plate 4 by three screws 13 and nuts 14. It is fixed to 15 shafts 15 a with set screws 16.
[0082]
On the other hand, the holding plate 5 is provided with a pin 17 for giving a predetermined rotation angle to the anti-vibration lever 1 and abuts with a pin 18 provided on the shaft 2 at an end of the predetermined rotation angle.
[0083]
Further, as shown in FIGS. 1 and 2, the shaft 15b of the electromagnetic clutch 15 opposite to the shaft 15a connected to the gear 8c is subjected to two-way cutting and is fixed to the holding plate 5. 19 and the shaft 15b are fitted in two ways and their rotation is restricted.
[0084]
As shown in FIGS. 2 (a) and 2 (b), with regard to the anti-vibration pre-operating means and the anti-vibration device, only the essential parts are extracted from the actual lens device configuration, and the operation configuration is easy to understand. Configurations having different phases are arranged in the same direction in the optical axis direction (arrow C in FIG. 1). The vibration isolator has the same configuration as that described with reference to FIGS. 23 to 30. In FIGS. 2A and 2B, the correction lens 20 and the holding frame 21 that holds the correction lens 20 are used. The cam projection 21a, the second yoke 22, the vibration isolator housing 23, and the lock ring 7 are visible.
[0085]
Further, the lock ring 7 is counterclockwise by a lock spring 26 provided between a spring hook 24 provided on the vibration isolator housing 23 and a spring hook 25 provided on the lock ring 7. The cam projection 21a of the holding frame 21 and the cam projection 7a provided on the lock ring 7 are engaged with each other (the state shown in FIGS. 2A and 3), and the holding frame 21 and the correction lens 20 are It is mechanically held and fixed at the optical axis center position with extremely high accuracy.
[0086]
Next, as shown in FIG. 6, the anti-vibration lever 1 is disposed on the right rear side while avoiding the left side surface and the upper surface that are frequently operated in the operation of the normal lens device. This means that the image stabilization pre-operation by the image stabilization lever 1 releases the locking of the correction lens 20 and puts it in a vibration-proof preparation state. This is an arrangement for avoiding the risk of erroneous operation during the shooting stage. Basically, switching of the vibration proof operation by the vibration proof switch 27 described later is frequently performed in a normal operation.
[0087]
6 to 8, in the imaging apparatus including the lens device 28 and the lens device 28 and the video camera 29, the image stabilization main switch 27 is disposed on the upper surface of the electric drive unit 30 of the lens device 28, and at the same time, An anti-vibration main switch unit 32 that can be fixedly attached to an arbitrary position according to the photographer's preference can be connected via a connector 31 provided at the lower part of the drive unit 30. In addition, 34 shown in FIG. 7 is a VTR switch.
[0088]
Next, the operation by the mechanism system in the first embodiment of the present invention will be described.
[0089]
When the photographer turns on the power of the photographing system shown in FIG. 8 (normally, the lens device 28 is driven by the power of the video camera 29), the correction lens 20 is electrically connected to the vibration isolating device at the optical axis center position. Control (electrical lock) is started, and at the same time, the electromagnetic clutch 15 is energized. When the electromagnetic clutch 15 is energized, the shaft 15b whose rotation is restricted by the holding plate 19 and the shaft 15a connected to the gear 8c in the gear train 8 are connected, and the vibration isolating lever 1 is operated to operate the gear 8a. Establishes a transmission system for rotationally driving the lock ring 7 and the gears 8b to 8c.
[0090]
The electromagnetic clutch 15 connects the shaft 15b and the shaft 15a by energization, whereby a predetermined slip torque is generated to prevent reversal in the unlocked state of the lock ring 7 (the urging force of the lock spring 26). Against). However, the predetermined slip torque and the operating force of the vibration isolating lever 1 have a relationship of “predetermined slip torque <the operating force of the anti-vibration lever 1”. A structure is formed in which a transmission system is formed in which the gear 8a rotates and drives the lock ring 7 and the gears 8b to 8c as described above according to the operating force by sliding between the shafts 15a and 15b of the clutch 15.
[0091]
Accordingly, when the vibration-proof lever 1 is rotated in the direction of the arrow 331 in FIG. 2A, the lock ring 7 is rotated in the clockwise direction by sliding between the shafts 15a and 15b of the electromagnetic clutch 15, and the holding frame 21 The cam projection 21a of the lock ring 7 and the cam projection 7a of the lock ring 7 are released from charge, and a movable region necessary for vibration control of the holding frame 21 (and the correction lens fixed thereto) as shown in FIG. It is operated to the position to secure.
[0092]
When the operation of the anti-vibration lever 1 is completed, the electromagnetic clutch 15 via the gear train 8 having a predetermined reduction ratio is provided so that the lock spring 26 resists the force to push the lock ring 7 counterclockwise. Since the slip torque is set, the lock ring 7 is fixed at the position shown in FIG.
[0093]
Next, in the state where the holding frame 21 is electrically held at the optical axis center position, the anti-vibration main switch 27 shown in FIG. 7 or the anti-vibration main switch unit 31 shown in FIG. Temporary switch (momentary switch) that triggers operation only when is pressed, or alternate switch (alternate switch) that triggers one of the operation states by alternately repeating inversion according to the number of switch operations Therefore, when the image stabilization main switch 27 (or the image stabilization main switch unit 32) is turned on, the image stabilization by the image stabilization system is started.
[0094]
Further, when the VTR switch 34 (a switch that is not necessarily on the lens device 28 by an auxiliary operation device not shown) is operated in the state in which the shake correction is effective as described above, the video camera 29 is corrected for the shake correction. Shooting taking advantage of the effects of.
[0095]
When the image stabilization main switch 27 or the image stabilization main switch unit 32 is turned off, the image stabilization by the image stabilization system is completed, and the correction lens 20 is electrically fixed again at the optical axis center position. At this time, if the anti-vibration lever-1 is operated in the direction of the arrow 332 in FIG. 2 (b), the lock ring 7 and the holding frame 21 are moved by the slip between the shafts 15a and 15b of the electromagnetic clutch 15 in the same manner as described above. When the cam projections 7a and 21a are engaged with each other and are operated up to the position shown in FIG. 2A, the locking of the correcting means is completed.
[0096]
A lock spring 26 that connects the spring hook 24 provided on the vibration isolator housing 23 and the spring hook 25 provided on the lock ring 7 is used when power supply to the lens device 28 is interrupted, or as described above. When the lens device 28 is conveyed alone without performing the locking operation, the shaft 15a of the electromagnetic clutch 15 is a result of the power supply being cut off in order to prevent damage to the correction lens 20 and the like in the vibration isolator. , 15b is released, and when the prevention of inversion of the lock ring 7 becomes invalid, a spring force for pulling back the lock ring 7 is applied. As a result, the anti-vibration system is reliably protected even when the lens device 28 is not supplied with power.
[0097]
FIG. 4 and FIG. 5 are flowcharts for performing the above-described series of operations, and will be briefly described below. This is performed by a control means such as a microcomputer (not shown).
[0098]
When the power (main) switch (not shown) of the video camera 29 is turned on (YES from # 1001 to # 1002), the correction means (mainly by the holding frame 21 and the correction lens 20) is set at a predetermined position (normally) Is controlled to be electrically fixed and supported at the center position of the optical axis (# 1002), and at the same time, energization of the switching joint mechanism (the electromagnetic clutch 15 in the present embodiment) is started (# 1003).
[0099]
Next, if a manual vibration isolating pre-operation (in this embodiment, rotating the anti-vibration lever 1 in the direction of the arrow 331 in FIG. 2) has not been started, the vibration isolating pre-operation standby state is entered and started. If so (# 1004 → # 1005), the correction means is unlocked (# 1005), and shake detection is started (# 1006). When the correction means is in the unlocked state (see FIG. 2B), the shaft 15b of the electromagnetic clutch 5 is prevented from rotating by the fixed plate 19 in the gear train 8 by energization of the switching joint mechanism. The lock ring 7 maintains the rotational position where the correction means is released against the spring force of the lock spring 26.
[0100]
Here, it is determined whether or not the image stabilization main switch 27 (or 32) is turned on (# 1007). If the image stabilization main switch 27 is off, the image stabilization main switch 27 enters an on standby state, and if it is turned on (# 1007). YES) Anti-vibration control is started based on the target value signal (# 1007 → # 1008).
[0101]
Further, it is checked whether or not the VTR switch 34 is turned on during image stabilization control (# 1009). If it is turned on (YES in # 1009), the video camera 29 starts shooting (# 1009 → # 1010). Thereafter, the shooting (# 1010) is completed, and it is checked whether or not the VTR switch 34 is turned off (# 1011). If not, shake correction and shooting are continued as they are, and if off is confirmed (YES in # 1011) Next, it is checked whether or not the image stabilization main switch 27 (or 32) is turned off (# 1011 → # 1012). If the image stabilization main switch 27 (or 32) is not turned off, the image pickup standby state is entered with the image stabilization control working (# 1012 → # 1008), and when the image stabilization main switch 27 (or 32) is turned off ( If YES in # 1012, the image stabilization control is stopped, and the correction means is electrically fixed at a predetermined position (optical axis center position) (# 1013).
[0102]
Next, it is determined whether or not the anti-vibration lever 1 is operated. If not, the anti-vibration standby state is entered (# 1014 → # 1007). On the other hand, when the anti-vibration lever 1 is turned off (YES in # 1014), the correction means by the holding frame 21 (and the correction lens 20 fixed thereto) is locked by the lock ring 7 (# 1015). Then, the back shake detection for a certain time is finished (# 1016).
[0103]
Further, it is confirmed that the main switch of the video camera is turned off (# 1017). If the video camera is not turned off, the photographing system enters an image stabilization standby state (# 1017 → # 1004). If it is confirmed that the power is off, the power supply of the entire photographing system is cut off, and this flow ends.
[0104]
According to the first embodiment described above, the lock ring 7 is moved clockwise through the vibration isolating lever 1 and the gear train 8 by manually operating the vibration isolating lever 1 in the direction 331 in FIG. It is made to rotate and the electromagnetic clutch 15 holds the unlocked state (the state shown in FIG. 2B). In other words, the same specification can be realized by replacing the unlocking means of the correction means for making the vibration-proof standby state by the voice coil motor or the DC motor, which has been conventionally performed, with a manual mechanism. Therefore, it is possible to reduce the volume, cost, and power of the mechanism required for this purpose.
[0105]
It should be noted that the anti-vibration main operation means includes the anti-vibration lever 1 corresponding to the manual operation member, the gear train 8 corresponding to the driving mechanism, the electromagnetic clutch 15 and the like of the anti-vibration pre-operation means on the lens barrel of the lens device 28. The anti-vibration main switch 27 corresponding to is provided in a drive mechanism unit (drive unit) for performing zooming and focusing of the lens device 28 electrically. Similarly, the image stabilization switch unit 32 corresponding to the image stabilization main operation means is connected to the lens device 28 with a cable or the like, and can be arranged at any place of the operator, and is also provided in the lens barrel. It has a possible configuration.
[0106]
(Second Embodiment)
9 to 13 are diagrams related to a lens apparatus according to a second embodiment of the present invention. Specifically, FIG. 9 is a configuration diagram relating to a locking means different from the first embodiment, and FIG. FIG. 11 and FIG. 11 are a detailed view of a portion D in FIG. 9 and an EE cross-sectional view, respectively. In addition, the same code | symbol is attached | subjected about the component similar to FIGS. 1-3, and the detail is abbreviate | omitted. 12 and 13 are flowcharts showing a second embodiment of the present invention.
[0107]
In the second embodiment, the configuration different from the configuration in FIG. 1 is a configuration around the mechanism system for coupling the vibration-proof lever and the shaft. As shown in FIG. 9, unlike the shaft 2 in the first embodiment, the cam shaft 36 has a washer 37 that generates a predetermined frictional force on the shaft 35 at the same position, and a D-cut washer that presses the cam shaft 36. It is fixed by screws 39 with 38 interposed. For this reason, although it is restricted in the axial direction, it can rotate in the rotational direction around the axis.
[0108]
As shown in FIG. 11, a pin 40 is provided on the shaft 35, and a torsion spring 41 is charged and fixed to the pin 40 and the cam shaft 36, respectively. The cam shaft 36 is provided with notches 36a and 36b corresponding to a predetermined rotation angle, and the pin 40 is always in contact with either the notch 36a or 36b.
[0109]
As shown in FIG. 10, the fixing plate 5 in the second embodiment is provided on a switch fixing base 44 in which a first switch 42 and a first switch switching plate 43 are newly fixed with screws. The fixed position of the switch fixing base 44 is set so that the cam plate 36c provided on the cam shaft 36 and the first switch switching plate 43 are in contact with each other when a predetermined rotation angle is reached. It can be fine-tuned. The anti-vibration lever 45 is connected to such a cam shaft 36 by three screws and is operated by an operator.
[0110]
Next, the operation in the second embodiment of the present invention will be described with reference to FIGS.
[0111]
FIG. 10A and FIG. 11A show a configuration in which the locking means in the second embodiment of the present invention is in the initial position. In this state, the cam shaft 36 is charged by the torsion spring 41 in a direction opposite to the rotation direction of the unlocking, and the pin 40 is in contact with the notch end 36a. Further, the cam plate 36c and the first switch switching plate 43 are not in contact with each other.
[0112]
From the above configuration, when the operator starts operating the image stabilization lever 45 in order to put the imaging system in the image stabilization preparation state, as shown in FIGS. 10 (b) and 11 (b), the notch end 36a and While the cam shaft 36 is rotated until the notch end 36b comes into contact with the pin 40 (meaning that it has a play operating range (range)), the first switch is released. The switching plate 43 is pushed by the cam plate 36c, and the first switch 42 is operated. In this state, position correction control (electrical lock) of the correction means is started, and at the same time, energization to the switching joint mechanism (the electromagnetic clutch 15 described in the first embodiment) is also started. Thereafter, when the operator continues to rotate the vibration isolating lever 45, the notch end 36a of the cam shaft 36 and the pin 40 come into full contact with each other, and the vibration isolating lever 45 is a gear directly connected to the shaft 35. An operation for releasing the locking means (the lock ring 7 described in the first embodiment) can be performed via the train 8, and the vibration-proof lever 45 is rotated by a predetermined rotation angle. The unlocking of the correction means is completed.
[0113]
As described above, when the correcting means is in the unlocked state, the operation of the anti-vibration lever 45 is released, and the cam shaft 36 is pushed back to the position of the notch end 36a by the action of the torsion spring 41 and is stabilized. Also at this time, the first switch switching plate 43 is kept pushed by the cam plate 36c, and the first switch 42 remains activated.
[0114]
Thereafter, the vibration isolating lever 45 is turned off (in the direction of the arrow 332 in the first embodiment), the first switch switching plate 43 is separated from the cam plate 36c, and the operation of the first switch 42 is turned off. The shake correction is continued.
[0115]
12 and 13 are flowcharts showing the operation of the second exemplary embodiment of the present invention. This corresponds to FIG. 4 and FIG. 5 in the first embodiment.
[0116]
When the power of the video camera 29 is turned on (# 2001), first, a standby state for manual vibration isolation pre-operation is entered, and here the vibration isolation pre-operation by the vibration isolation lever 45 is turned on (YES in # 2002). When the first switch 42 is turned on in the range of the rotation angle of the cam shaft 36 with respect to the shaft 35 (YES in # 2003), the position fixing control of the correcting means is started (# 2004). Thereafter, energization of the switching joint mechanism (electromagnetic clutch 15) is started (# 2005).
[0117]
When the vibration isolating pre-operation is further continued, the unlocking operation of the correcting means is performed. The mechanism for maintaining the unlocked state is as described in detail in step # 1005 of FIG. 4 in the first embodiment, and step # of FIG. Since the flow from 2008 to step # 2014 in FIG. 13 is as described in detail in the first embodiment (corresponding to step # 1007 in FIG. 4 to step # 1013 in FIG. 5), It is omitted here.
[0118]
When the image stabilization is stopped and the image stabilization off operation is performed by the image stabilization lever 45 (YES in # 2015), when the rotation of the off operation reaches a region where the operation of the first switch 42 is turned off (# In 2016, the switching joint mechanism is de-energized (# 2017), and the correction means is locked (# 2018). Thereafter, the correction unit position fixing control and the shake detection are finished (# 2019 and # 2020). In this state, if the main switch of the video camera remains on, the photographing system returns to the standby state for manual image stabilization pre-operation (# 2021 → # 2001), and if it is turned off, this flow ends.
[0119]
According to the second embodiment described above, a predetermined play range (rotation range) is provided in the operation range in which the vibration-proof lever 45 is positioned from the locked state to the unlocked state. A first switch 42 that is turned on by a camshaft 36 that is one of the components of the drive mechanism is provided, and the correction means is turned on by turning on the first switch 42 before unlocking the correction means. Since the position fixing control (electrical lock) is performed, the correction lens does not move inadvertently when the correction means is unlocked, and is caused by the fluctuation of the correction lens caused by a disturbance or the like. It is possible to eliminate discomfort in the captured image.
[0120]
More specifically, in the stage where the locking of the correction unit is released, the correction unit moves due to the influence of gravity or the like, so that the sense of discomfort or discomfort of the photographed image is reduced until the locking unit is activated. This is prevented by electrically fixing the correction means to the optical axis in the range of the rotation angle. Therefore, a stable image can be obtained at all times when the locking of the correction means is performed.
[0121]
(Third embodiment)
14 to 17 are diagrams relating to a lens apparatus according to a third embodiment of the present invention. Specifically, FIG. 14 is a configuration diagram relating to a locking means different from the second embodiment, and FIG. Reference numeral 15 denotes a main part of the locking means corresponding to FIG. 2 in the first embodiment and the interlocking of the second switch 46 operated in the unlocking position state of the correction means as seen from the F direction in FIG. It is the schematic which showed a mode to do. In addition, the same code | symbol is attached | subjected about the component similar to what was described in the said 1st Embodiment and 2nd Embodiment, and the detail is abbreviate | omitted. 16 and 17 are flowcharts showing the operation of the third embodiment of the present invention.
[0122]
1 to 3 in the first embodiment and the configuration in FIG. 9 in the second embodiment are different from the configuration of the spring hook 25 for hooking the lock spring 26 at a predetermined position. The vibration isolator housing 3 is provided with a second switch switching plate 47 provided in this manner and a switch fixing plate 48 to which the second switch 46 is fixed via the second switch switching plate 47. This is the point.
[0123]
Next, the operation in the third embodiment of the present invention will be described with reference to FIGS.
[0124]
As described in the second embodiment, the control for electrically fixing the correction means at a predetermined position is started by the operation of the first switch 42. At the time when the vibration pre-operation is started), in the third embodiment of the present invention, the locking release operation of the lock ring 7 serving as the locking means is different from the first and second embodiments described above. The energization of the electromagnetic clutch 15 which is the switching joint mechanism is not started.
[0125]
As shown in FIG. 15A, the correction means (in the case of the present embodiment, mainly the holding frame 21 and the correction lens 20) are abutted and fixed at three positions by the lock ring 7 which is a locking means. In this state, the spring hook 25 provided on the lock ring 7 and the second switch switching plate 47 are in a positional relationship (off state). Yes.
[0126]
Next, when the lock ring 7 is rotated by the anti-vibration lever 45 and the unlocking operation of the correction unit is started, the contact between the lock ring 7 and the cam projection 21a of the holding frame 21 in the correction unit is released. As described in the second embodiment, when the first switch 42 is turned on (within the range of play in the operation area of the vibration control lever 45), the position of the correction means Since it is controlled to be fixed, the correction means does not move under the influence of gravity or vibration.
[0127]
Further, when the rotation of the lock ring 7 progresses and the positional relationship shown in FIG. 15B is formed, the correction means is in an unlocked state in which it can freely move around in a plane perpendicular to the optical axis. . At this time, the spring hook 25 and the second switch switching plate 47 abut so that the second switch 46 is pushed in (turned on), and receives the operation of the second switch 46, Energization of the electromagnetic clutch 15 is started. Then, the shaft 15b whose rotation is restricted by the fixed plate 19 and the shaft 15a directly connected to the gear train 8 having a predetermined reduction ratio are connected, and the lock ring 7 always charged by the lock spring 26 is connected. The structure prevents reversal (reverse rotation).
[0128]
16 and 17 are flowcharts showing the operation of the third exemplary embodiment of the present invention.
[0129]
First, when the power of the video camera 29 is turned on (# 3001), the imaging system is in a standby state for anti-shake preparation until the anti-shake lever 45 is rotated. Here, the manual anti-shake pre-operation is turned on. (YES in # 3002), the cam shaft 36 and the pin 40 provided on the shaft 35 described in the second embodiment are in contact with each other in the rotational direction of the vibration-proof lever 45 (the cut end 36a). The cam plate 36c and the first switch switching plate 43 are interlocked and the first switch 42 starts operating (#) before the locking release mechanism starts to interlock. 3002 → # 3003).
[0130]
When the operation of the first switch 42 is started, control for electrically fixing the position of the correction means is started (# 3004), and at the timing when the locking means (the lock ring 7 in the present embodiment) is released. In this case, the position of the correction means is fixed electrically, so that it does not cause a sense of incongruity or discomfort that is sensed in the photographed image when the correction lens shows an unnatural movement.
[0131]
Further, at this time, even if the operator stops the manual vibration isolating pre-operation for some reason, the locking mechanism is always operated by the locking force by the locking spring 26 described in the first embodiment. Since the mechanism against this is not established, first, the vibration isolating lever 45 is rotated in reverse by the spring force of the lock spring 26, and the cam shaft 36 is reversed in the operation direction by the spring force of the torsion spring 41. Returning to the initial position, the first switch 42 is also automatically turned off, and enters the standby state for the initial manual image stabilization pre-operation (# 3005 → # 3002).
When the anti-vibration lever 45 is operated to a position where the lock ring 7 finishes rotating by a predetermined rotation angle, the spring hook 25 and the second switch switching plate 47 come into contact with each other, and the second switch 46 is operated. (YES in # 3005), energization of the electromagnetic clutch 15 serving as a switching joint mechanism is started (# 3006), and the lock ring 7 maintains the unlocking position against the spring force of the lock spring 26. At this stage, unlocking of the correcting means is completed (# 3007), and shake detection is started.
[0132]
Since the flow from Step # 3009 in FIG. 16 to Step # 3015 in FIG. 17 is the same as the flow described in detail in FIGS. 4 and 5, the details are omitted here.
[0133]
Next, when the photographer performs an off operation of the vibration-proof lever 45 (YES in # 3016), if the operation rotation angle is small, energization to the electromagnetic clutch 15 is maintained (# 3017 → #). 3016), when the anti-vibration lever 45 is turned off to the rotational position of the lock ring 7 where the second switch 46 is turned off (YES in # 3017), the energization of the electromagnetic clutch 15 is terminated ( # 3018), the connection between the shaft 15a and the shaft 15b is released, and the mechanism for holding the lock ring 7 as the locking means in the locking release position becomes free, and the lock ring 7 is engaged by the spring force of the lock spring 26. The control to fix the correction means at a predetermined position is finished by the turning-off operation of the first switch 42 which is rewound to the stop position (# 3019) and is forcibly turned off at this time (# 3020). Shake to end the detection (# 3021).
[0134]
In this state, if the main switch of the video camera 29 remains on, the photographing system returns to a standby state for manual image stabilization pre-operation (# 3022 → # 3002), and if it is turned off, this flow ends. .
[0135]
According to the third embodiment described above, the second switch 46 that is turned on by the spring hook 25 when the vibration isolating lever 45 is positioned from the locked state to the unlocked state is provided, Since the electromagnetic clutch 15 is energized by turning on the second switch 46, the operating force for turning on the vibration-proof lever 45 is the first and second embodiments described above. Compared with the operation force due to the slip torque of the electromagnetic clutch 15 described in the above, it is only a force that resists the spring force of the lock spring 26. Therefore, the operation can be performed with a lighter force, and the operator can prevent the operation with some intention. Even when the operation of the swing lever 45 is stopped halfway or when disturbance vibration or the like is applied, the locking means surely works.
[0136]
Further, in the configuration according to the third embodiment, as described in the second embodiment, when the first switch 42 is turned on, the locking means unlocks the correction means. Since the electric fixing control of the correction means is surely performed, not only the power consumption required for the position control of the correction means is prevented, but also the second switch 46 is connected to the correction means as described above. Since it is set so as to be turned on in the positional relationship in which the stop release is completed, it is possible to prevent power consumption required for the electromagnetic clutch 15.
[0137]
(Fourth embodiment)
18 to 22 are views relating to a lens device according to a fourth embodiment of the present invention. Specifically, FIG. 18 is a configuration diagram of a locking means different from the third embodiment, and FIG. These are figures which show the principal part of the mechanism of the part regarding the latching equivalent to FIG. 10 in the said 2nd Embodiment, and FIG. 20 is a figure which shows the layout of the principal part of this 4th Embodiment. In addition, the same code | symbol is attached | subjected about the component similar to what was described in the said 1st-3rd embodiment, The detail is abbreviate | omitted. 21 and 22 are flowcharts showing the operation of the fourth exemplary embodiment of the present invention.
[0138]
  A difference from the configuration of FIG. 14 in the third embodiment is that a fixed plate that restricts rotation of one shaft 15b of the electromagnetic clutch 15 that is a switching joint mechanism, as shown in FIGS. 19InsteadSimilarly, the third switch 52 is screwed and fixed to the fixing plate 50 that restricts the rotation of the shaft 15b with a screw or the like through the insulating sheet 51, and the switch cover 53 is attached to the upper surface of the third switch 52. Such a locking device housing 49 is configured.
[0139]
As shown in FIG. 20, the switch cover 53, the third switch 52 provided in the lower part of the switch cover 53, and the anti-vibration lever 45 described in detail in the second to third embodiments above. Since the anti-vibration lever 45 is mainly used when the imaging system is started, an area frequently operated by the operator is avoided in order to avoid an erroneous operation during the imaging operation by the operator of the lens apparatus. The third switch 52 (or switch cover 53) is provided on a different surface from the vibration-proof lever 45, whereas the third switch 52 (or the switch cover 53) is provided.
[0140]
As described above, the anti-vibration lever 45 and the third switch 52 are provided on separate surfaces, while the anti-vibration lever 45 is used for unlocking operation, whereas the third switch 52 is engaged. This is for use as a trigger for turning off the energization of the electromagnetic clutch 15 which is a switching joint mechanism for maintaining the release position of the stopping means.
[0141]
With this configuration, in a shooting situation where shake correction is effective, the photographer intentionally operates to lock the correction means when the photographer wants to switch to shooting that does not use shake correction intentionally. The third switch 52 is provided on the upper surface of the side surface of the driving device of the lens device shown in FIG. 20 as a position where it can be operated and the operation is not difficult.
[0142]
A flow showing a series of operations of the lens apparatus including the above-described configuration will be described below with reference to FIGS. Note that, for a series of flows from step # 4001 in FIG. 21 to step # 4015 in FIG. 22, the operations described in detail in steps # 3001 to # 3015 in FIG. 16 and FIG. 17 in the third embodiment. Therefore, the description thereof is omitted here, and step # 4016 and subsequent steps will be described.
[0143]
In a situation where the series of photographing operations are finished and the image stabilization is stopped (# 4015 → # 4016), it is determined whether or not the third switch 52 is operated (# 4016), and the third switch 52 is determined. If is not operated, the lens apparatus returns to the on-standby state of the image stabilization main switch 27 (# 4016 → # 4009). On the other hand, when the third switch 52 is operated (YES in # 4016), the energization to the electromagnetic clutch 15 serving as the switching joint mechanism is cut off (# 4017), and the shaft 15a and the shaft 15b are disconnected. The connection is released and the mechanism for holding the locking means in the release position becomes free, and the locking means is rewound to the locking position by the spring force of the lock spring 26 (# 4018), and at this time it is forcibly turned off. When the first switch 42 is turned off, the control for fixing the correction means to a predetermined position is finished (# 4019), and then the shake detection is finished (# 4020).
[0144]
In this state, if the main switch of the video camera 29 remains on, the photographing system returns to a standby state for manual image stabilization pre-operation (# 4021 → # 4002), and if it is turned off, this flow ends. .
[0145]
  According to the fourth embodiment described above, when a photographer attempts to shoot without intentionally performing shake correction after the shooter once enters a shooting state in which shake correction is enabled or in a shooting standby state. In the anti-vibration lever 45 provided in a place where it is relatively difficult to operate from the viewpoint of preventing erroneous operation.touchWithout any problem, the correction means is locked only by turning on the third switch 52 (in this embodiment, the pushing operation of the third switch 52). Compared with the unlocking operation by the lever 45, an operation mode more suitable for the photographing situation is possible.
[0146]
In the first to fourth embodiments, since the electromagnetic coupling 15 is used as the switching joint mechanism, the lens device (comprising a vibration isolation system) 28 can be attached to and detached from the video camera 29. When the lens device 28 is inadvertently disconnected from the video camera 29 in the vibration-proof preparation state and the power supply to the electromagnetic clutch 15 is cut off, the electromagnetic clutch 15 unlocks the correction means. However, at this time, the lock spring 26 operates the lock ring 7 as the correction means, and the correction means can be held in the locked state, so that no power is supplied to the lens device as described above. Even in the disconnected state, the correction means is securely locked, and damage to the correction means due to disturbance vibration can be prevented.
[0147]
【The invention's effect】
  As explained above, claim 1Or 2According to the invention described in the above, the power consumption of the driving mechanism required for unlocking the correction means is eliminated, and the allocation of the power consumption of the power source accompanying the multifunctionalization of the lens device is made advantageous, and the size is reduced. It is possible to provide a lens device capable of reducing the cost.
[0148]
  Claims3Or4According to the invention described in (1), it is possible to provide a lens apparatus that can prevent discomfort associated with a delay in unlocking of the correcting means by the locking means and imaging failure.
[0149]
  Claims5Or6According to the invention described in (1), it is possible to provide a lens apparatus that can improve the operability of the image stabilization pre-operation means and realize further power saving.
[0150]
  Claims7Or8According to the invention described in the above, even when the power supply to the lens device is cut off, or even if the lens device is inadvertently removed from the main body device that receives the power supply, the correction means is securely held in the locked state. Thus, it is possible to provide a lens device that can prevent the correction means from being damaged by disturbance vibration.
[0151]
  Claims9According to the invention described in (4), it is possible to provide a lens device that can easily perform an operation of setting the image stabilizing system to an inactive state during use of the lens device.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a cross section in the optical axis direction of a main part of a locking mechanism of a lens apparatus according to a first embodiment of the present invention.
2 is a configuration diagram showing the operation of the locking mechanism as viewed from the direction A shown in FIG.
3 is a configuration diagram showing a main part of a locking mechanism in a BB cross section in FIG. 1; FIG.
FIG. 4 is a flowchart showing a schematic operation of the lens apparatus in the configuration of FIGS.
FIG. 5 is a flowchart showing an operation subsequent to FIG.
FIG. 6 is a rear view of the lens apparatus according to the first embodiment of the present invention.
FIG. 7 is an upper view of FIG. 6;
FIG. 8 is a configuration diagram showing an imaging system using the lens device according to the first embodiment of the present invention.
FIG. 9 is a configuration diagram showing a cross section in the optical axis direction of a main part of a locking mechanism of a lens device according to a second embodiment of the present invention.
10 is a detailed view of part D in FIG. 9;
11 is a cross-sectional view taken along line EE in FIG. 9;
12 is a flowchart showing a schematic operation of the lens apparatus in the configuration of FIGS. 9 to 11. FIG.
13 is a flowchart showing a continuation of the operation of FIG.
FIG. 14 is a configuration diagram showing a cross section in the optical axis direction of a main part of a locking mechanism of a lens device according to a third embodiment of the present invention.
15 is a configuration diagram showing the operation of the locking mechanism as seen from the direction E in FIG.
16 is a flowchart showing a schematic operation of the lens apparatus in the configuration of FIGS. 14 and 15. FIG.
FIG. 17 is a flowchart showing a continuation of the operation of FIG.
FIG. 18 is a configuration diagram showing a cross section in the optical axis direction of a main part of a locking mechanism of a lens device according to a fourth embodiment of the present invention.
FIG. 19 is a configuration diagram showing a main part of a portion different from the first to third embodiments.
FIG. 20 is a diagram showing a layout of operation means in a fourth embodiment of the present invention.
FIG. 21 is a flowchart showing a schematic operation of the lens apparatus in the configuration of FIGS.
FIG. 22 is a flowchart showing a continuation of the operation of FIG.
FIG. 23 is a perspective view showing a schematic configuration of a conventional vibration isolation system.
24 is an exploded perspective view showing the structure of the correction optical apparatus in FIG. 23. FIG.
25 is a view for explaining a hole shape of a housing in which the vibration isolator of FIG. 24 is incorporated.
FIG. 26 is a diagram for explaining a support frame that holds the correction lens of FIG. 24;
27 is a diagram for explaining a structure for restricting the rotational movement of the correcting means of FIG. 24;
28 is a plan view showing the structure of the locking means in FIG. 24. FIG.
29 is a diagram for explaining the gear train of FIG. 28. FIG.
30 is a plan view for explaining the operation of the locking mechanism of FIG. 28. FIG.
FIG. 31 is a timing chart when the locking mechanism of FIG. 28 operates.
FIG. 32 is a flowchart showing an outline of an operation of image stabilization control in a conventional lens device.
FIG. 33 is a flowchart showing an operation subsequent to FIG. 32;
[Explanation of symbols]
1,45 Anti-vibration lever
2,35 axes
3,49 Locking device housing
4,5 Holding plate
7,129 Lock ring
8,132 Gear train
15 Electromagnetic clutch
17, 18, 40 pins
19, 50 fixed plate
20,114 Correction lens
21 Holding frame
22,125 Second yoke
23,111 Vibration isolator housing
24, 25 Spring hook
26,131 Lock spring
27 Anti-vibration switch
28 Lens device
30 Electric drive unit
32 Anti-vibration switch unit
34 VTR switch
36 camshaft
41 Torsion spring
42 First switch
43 First switch switching plate
44 Switch mounting base
46 Second switch
47 Second switch switching plate
48 Switch fixing plate
52 third switch
53 Switch cover
102 Lens barrel
105 Correction optical device
106 Actuator
107,118 Position detecting element

Claims (8)

And correcting means for correcting a shake, comprising a locking means for locking the said correction means, wherein the vibration isolation system that performs shake correction by driving the correcting means, and image stabilization ready state-proof isolation system In a lens apparatus having a vibration isolation pre-operation means for
The vibration isolation Pre operating means comprises a manual operating member, in conjunction with the operation of該手dynamic operating member, the locking means, the locking release in the unlock condition from the state locked the correction means It has been closed and a drive mechanism for holding,
A range of play is provided in the operation range of the manual operation member until the correction means in the locked state is set to the unlocked state, and is turned on to operate the drive mechanism within the range of play. And a first switch for starting control to electrically fix the correction means to the center of the optical axis of the optical system of the lens apparatus. The anti-vibration main operation means for driving the anti-vibration system and the anti-vibration main operation means are operated in a state where the correction means is unlocked by the anti-vibration pre-operation means. The lens apparatus according to claim 1, further comprising a control unit that operates the vibration system. The electrical control for fixing the correction means to the center of the optical axis of the optical system of the lens apparatus by turning on the first switch is performed until the image stabilization main operation means is operated. Item 4. The lens device according to Item 1 . At the time of operating the manual operation member until the correction means in the locked state can be set to the unlocked state, the holding means for holding the anti-vibration preparation state for maintaining the unlocked state of the correcting means turned, the lens device according to any one of claims 1 to 3, characterized by comprising a second switch for operating said holding means. The holding means has an electromagnetic clutch,
The lens apparatus according to claim 4 , wherein the electromagnetic clutch is energized in response to turning on of the second switch and maintains the unlocked state of the correction unit. The second switch is turned off by operation of the manual operation member for bringing the correction means in the unlocked state into a locked state, and the electromagnetic clutch is de-energized by turning off the second switch. The lens apparatus according to claim 5 , wherein the lens device is in a state and does not maintain the unlocking state of the correction unit. When the electromagnetic clutch is de-energized and the unlocking state of the correction means cannot be maintained, a spring which is one of the components of the drive mechanism acts, and the correction means is locked. The lens device according to claim 6 , wherein the lens device is locked by means. When the third switch is operated, the electromagnetic clutch deactivates the holding unit, stops maintaining the unlocking state of the correction unit, and causes the locking unit to function. The lens device according to claim 5 .

Images