JP2003156776A - Lens barrel and photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel in which a mounting circuit board and a vibration detection means are spatially arranged more efficiently when they are arranged in the lens barrel, and a photographing device equipped with the lens barrel. SOLUTION: In this lens barrel having a holding lens barrel 30 holding a lens, the circuit board 33 on which electronic parts are mounted, and the vibration detection means (sensor holding member 35) detecting the shake of a lens barrel main body, the circuit board and the vibration detection means are arranged at nearly the same position in an optical axis direction and in peripheral direction ranges different from each other on the outer periphery of the holding lens barrel.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a film camera,
More specifically, the present invention relates to a lens barrel used in a photographing device such as a video camera or a digital camera, and more particularly to a lens barrel having a function of preventing image blur due to so-called camera shake.

[0002]

2. Description of the Related Art In a current camera, all important operations for photographing such as exposure determination and focusing have been automated, and it is less likely that even a person unskilled in operating the camera will fail in photographing. In addition, recently, a system for correcting image blur caused by camera shake applied to the camera has also been studied, and the applicant of the present invention has proposed a technique described in Japanese Patent Laid-Open No. 3-188430.

Here, a camera system for preventing image blur due to camera shake will be briefly described. The camera shake at the time of shooting is a vibration of about 1 Hz to 12 Hz as a frequency, but a basic method for taking a picture without image shake even if such a shake occurs at the time of shutter release. As a result, it is necessary to detect the vibration of the camera due to camera shake and displace the correction optical means according to the detected value.

Therefore, in order to be able to take a photograph in which the image blur does not feel even if the camera shakes, firstly, the vibration of the camera is accurately detected, and secondly, the change of the optical axis due to the vibration is corrected. Will be required.

In principle, the vibration is detected by a vibration detecting means for detecting an angular acceleration, an angular velocity, an angular displacement and the like, and an output signal of the vibration detecting means is electrically or mechanically integrated to obtain the angular displacement. Can be carried out by mounting the angular displacement output means for outputting on the camera or the lens. Then, based on this detection information, the correction optical means is driven so as to decenter the photographing optical axis, and image blur suppression is performed.

An outline of a vibration isolation system using the vibration detecting means will be described with reference to FIG. The illustrated example is a system for suppressing image shake caused by vertical shake p and horizontal shake y of the camera.

Reference numeral 1 is a lens barrel. Reference numerals 2p and 2y denote vibration sensors for detecting vertical shake and horizontal shake of the camera, respectively, and their respective vibration detection directions are indicated by 3p and 3y.

Reference numeral 4 denotes a correction optical element, and coils 5p and 5y for applying thrust to the correction optical element and a detection element 6 for detecting the position thereof.
p, 6y. A position control loop is provided for the correction optical element 4, and the vibration sensor 2
Stability on the image plane 7 is ensured by driving the correction optical element 4 in the plane orthogonal to the optical axis with the outputs of p and 2y as target values.

As described above, as the camera or the lens itself becomes multifunctional, various elements such as a driving means for driving the vibration detecting means and the correction optical means are incorporated. Therefore, in order to prevent an increase in size, it is important to efficiently arrange each component and effectively utilize the space.

The applicant of the present invention has proposed in Japanese Patent Laid-Open No. 08-094899 that the vibration detecting means and the lens driving means for focus adjustment or the electric parts are arranged so as not to interfere with each other.

[0011]

However, Japanese Patent Laid-Open No. 8-94899 proposes that electric components on a mounting circuit board for controlling the lens barrel are arranged so as not to interfere with the vibration detecting means. Is only
It does not mention the specific arrangement relationship between the vibration detecting means and the mounting circuit board itself. Unless the vibration detecting means and the mounted circuit board are efficiently arranged in the lens barrel, the lens barrel may be upsized.

Therefore, the present invention provides a lens barrel and a photographing device provided with the lens barrel, which can be arranged more efficiently when the mounting circuit board and the vibration detecting means are arranged in the lens barrel. Is intended.

[0013]

In order to achieve the above object, according to the present invention, a holding lens barrel for holding a lens, a circuit board on which electronic parts are mounted, and a vibration detection for detecting shake of the lens barrel body are provided. In the lens barrel having the means, the circuit board and the vibration detecting means are arranged at substantially the same position on the outer periphery of the holding barrel in the optical axis direction and in different circumferential ranges.

For example, the vibration detecting means is arranged within the arrangement range (width) of the circuit board in the optical axis direction and different from the arrangement range of the circuit board in the circumferential direction.

As a result, the circuit board and the vibration detecting means can be efficiently arranged on the outer circumference of the holding lens barrel without interfering with each other, and a small lens barrel or an image pickup device having an image blur correction function can be provided. The device can be realized.

The circuit board may have a plurality of flat portions facing the outer peripheral surface of the holding barrel, and at least one flat portion of the plurality of flat portions may be substantially different from other flat portions. By making it folded back so that it is parallel, without increasing the size of the lens barrel,
It is possible to increase the component mounting area on the circuit board.

[0017]

1 to 4 show the configuration of a zoom lens barrel with a shake correction function for a single-lens reflex camera (photographing apparatus) according to an embodiment of the present invention. 1 is a cross-sectional view of the zoom lens barrel, FIG. 2 is a front view of the zoom lens barrel around the 6-group barrel, FIG. 3 is a perspective view of the 6-group barrel around, and FIG. It is an exploded perspective view of the group lens-barrel periphery.

In FIG. 1, reference numeral 11 denotes a built-in hood, which is fitted on the outer peripheral portion of a front lens barrel 12 to be described later.
If harmful light enters the lens, the built-in hood 11 is fed forward as shown below the center line (optical axis) to cut off the harmful light.

Reference numeral 12 denotes a front lens barrel, which includes lens groups L1 and L.
2 is held and is fixed to the guide cylinder 13. Guide tube 13
In the rear small diameter part of the
3a is formed, and the diaphragm unit 14 is fixed by screws 15.

Further, a movable barrel 17 for holding the lens unit L3 is fitted inside the small diameter portion at the rear of the guide barrel 13, and a focus key 18 is rotatable on the outside of the small diameter portion. It is provided. The focus roller 17a provided on the moving barrel 17 is one of the focus cam grooves 13a.
And the focus key 18 is engaged.

Reference numeral 19 denotes a manual ring, which is rotatably fitted to the outer circumference of a large diameter portion provided in the middle portion of the guide cylinder 13. When the manual ring 19 is rotated, the rotation causes the focus key 18 to rotate via the power transmission mechanism in the actuator unit 20 which is fixed to the outer circumference of the small diameter portion of the guide cylinder 13 with the screw 21. As a result, the movable barrel 17 moves in the optical axis direction and the focus can be adjusted.

Reference numeral 22 denotes a fixed cylinder, which is arranged on the rear edge side of the guide cylinder 13. A graduation window 23, a part of which is made of a transparent member, is provided in the front portion of the fixed barrel 22 so that the distance graduation 24 that rotates around the optical axis as the focus key 18 rotates can be visually recognized. It has become.

Further, before and after the outer peripheral portion of the fixed barrel 22, a shake correction switch 25 and an AF (auto focus) /
An MF (manual focus) switch 26 is provided. Further, a relay barrel 27 and a sixth group lens barrel 30 which will be described later are provided inside the fixed barrel 22.

The shake correction switch 25 is turned on when the correction lens group L5, which will be described later, performs a shift operation in a plane orthogonal to the optical axis, and is turned off when the correction lens group L5 is fixed.

When the AF / MF selector switch 26 is turned on, the actuator unit 20 is driven based on the focusing signal from the camera side, and the movable barrel 17 is driven in the optical axis direction via the focus key 18 to automatically move. Focus adjustment operation is performed. In the case of MF, focus adjustment is performed by rotating the manual ring 19 as described above.

Reference numeral 27 is a relay cylinder, which connects and supports the fixed cylinder 22 and the guide cylinder 13. The lens group L4 is held at the front end of the relay cylinder 27, and the hole 2 is provided at the rear of the relay cylinder 27.
A shake correction optical unit 29 is supported via a roller 28 that enters 7a. Also, at the rear end of the relay cylinder 27,
The 6-group barrel 30 that holds the lens group L6 is in contact with
It is connected to the relay cylinder 27 by screws 31.

Further, the shake correction optical unit 29 has a correction lens group L5, and an image shake correction effect can be obtained by shifting the correction lens group L5 in the direction orthogonal to the optical axis.

The structure of the shake correction optical unit 29 will be described with reference to FIG. In the figure, reference numeral 61 is a base plate, and a roller 28 is provided in a hole 61a formed on the outer periphery thereof.
Is inserted and supported by the relay cylinder 27.

A lock ring 62 is rotatably fitted to the step on the front surface of the intermediate partition of the main plate 61. The rotor 63 is attached to the front surface of the lock ring 62 via a rubber ring 68.

A stator 64 facing the front of the rotor 63
An electrostrictive element is attached to the flexible circuit board. The stator 64 has a felt 65 in front of it.
A pressing plate 67 is urged toward the lock ring 62 via a spring washer 66.

The pressing plate 67 is passed through three notches 61b formed at the front edge of the main plate 61, then rotated by a predetermined amount and fixed to the main plate 61 by so-called bayonet coupling.

On the other hand, projections 69a that radially project are provided at three locations on the outer periphery of the support frame 69 that holds the correction lens group L5 with a C ring or the like. In the locked state of the correction lens unit L5 in which the shake correction optical unit 29 is not operating, the tip of the protrusion 63a has the inner peripheral surface 62 of the lock ring 62.
It is fitted to a.

In order to bring the correction lens group L5 into the unlocked state or the locked state, a voltage is applied to the electrostrictive element from a control circuit (not shown) through the flexible substrate 70, and vibration is excited at the tip of the stator 64 to rotate the rotor. 63 is rotated. When the rotor 63 rotates, the lock ring 62 rotates via the rubber ring 68, and the correction lens group L5 can be switched between the locked state and the unlocked state.

The correction lens group L5 is held in the locked state and the non-locked state by the pressing plate 67 and the spring washer 66.
The urging force of the vibration motor, that is, the self-holding force of the vibration type motor. Therefore, no power is consumed to hold the correction lens unit L5 in the locked state and the unlocked state.

Further, on the rear surface side of the intermediate plate of the base plate 61, the second yoke 7 which is made of a magnetic material and is plated with luster
1 is fixed, and a permanent magnet (shift magnet) 72 made of a neodymium magnet or the like is magnetically attracted to the second yoke 71.

A coil (shift coil) 73 is adhered to the outer periphery of the support frame 69 arranged behind it, facing the permanent magnet 72. A first yoke 74 is attached to the inner peripheral surface of the relay cylinder 27 behind the support frame 69. An insulating sheet 75 is covered on the surface of the first yoke 74, and a hard board 76 on which a plurality of ICs, PSDs for position detection, etc. are mounted is joined by screws (not shown). There is.

A flexible circuit board 70 for signal transmission is thermocompression bonded to the hard board 76. The flexible circuit board 70 is provided with a pair of arm portions extending in the direction orthogonal to the optical axis, and each arm portion is connected to a shift coil 73 and an IRED (not shown). The position of the correction lens unit L5 is detected by these IRED and PSD.

Further, a part of the outer peripheral portion of the support frame 69 is urged by support spheres 77 and 79 with a spring 78 interposed therebetween in directions parallel to the optical axis and opposite to each other. It is provided in. As a result, the support frame 69 disposed between the first yoke 74 and the second yoke 71 is attached to the first yoke 7
It is pressed against the 4 side so that it does not move in the optical axis direction.

The operation of the shake correction optical unit 29 configured as described above will be described. When the electric signal from the vibration sensor 16 is transmitted to the mounting circuit board 33, a drive signal corresponding to the integrated signal is transmitted to the shift coil 73 in the shake correction optical unit 29 via the flexible printed board 70. . Then, the shake correction optical unit 29 shift-drives the correction lens unit L5 in the direction orthogonal to the optical axis so as to prevent or suppress the image shake caused by the shake by the same operation as the above-described conventional one.

In FIGS. 1 to 4, on the rear end surface of the relay barrel 27, a 6-group barrel 30 holding the lens groups L6a and L6b.
Are connected by screws 31, but the phase in the rotation direction of the sixth group lens barrel 30 is determined by the projection 30a at the front end thereof. Further, at two positions in the horizontal direction and the vertical direction with respect to the optical axis on the flange surface of the sixth group lens barrel 30,
A shielding part (hole) 35 in which the vibration sensor 16 is housed and held
The sensor holding member 35 having a and 35b is attached to the rubber seat 36.
It is attached by a screw 37 via. As a result, the sensor holding member 35 is arranged on the outer periphery of the cylindrical portion (the portion that holds the lens groups L6a and L6b inside) of the sixth-group barrel 30.

Further, the vibration sensors 16a and 16b are covered with urethane foam sheets 56a and 56b which also serve as shock absorbers, and after being housed in the sensor holding member 35, the shielding covers 57a and 57b are screwed. 58a, 5
By closing with 8b, the influence of disturbance on the vibration sensors 16a and 16b is reduced.

Further, the vibration sensors 16a and 16b are connected to a flexible circuit board (not shown) and further connected to a connector on the mounting circuit board 33.

A mount 32 is attached to the rear end surface of the fixed cylinder 22. The mount 32 has a bayonet shape to be connected to a not-shown single-lens reflex camera body, and a contact block 32a for transmitting an electric signal to a not-shown camera-side microcomputer or the like is provided on a rear end surface thereof.
Is stuck.

As shown in FIGS. 2 to 4, the mounting circuit board 3
Reference numeral 3 denotes a position substantially the same as the sensor holding member 35 on the outer circumference of the cylindrical portion of the sixth group lens barrel 30 in the optical axis direction (on the same plane), and is arranged in a different range in the circumferential direction from the sensor holding member 35. ing. The mounted circuit board 33 is attached to the board mounting portion 30a of the sixth group lens barrel 30 with screws 3
It is fixed by 4.

The width of the mounting circuit board 33 in the optical axis direction is
Since the width of the sensor holding member 35 is larger than the width of the sensor holding member 35 in the optical axis direction, the mounting circuit board 3 is disposed at substantially the same position in the optical axis direction.
3 and the sensor holding member 35 are such that the sensor holding member 35 fits within the width of the mounting circuit board 33 in the optical axis direction.

Further, the mounting circuit board 33 is a printed wiring board, and in order to increase the mounting area of electronic parts on the board, the mounting circuit board 33 is formed from a plurality of flat surface portions facing the outer peripheral surface of the cylindrical portion of the sixth group lens barrel 30. It is configured. Further, in order to increase the mounting area, one flat surface portion (may be a plurality of flat surface portions) 33a of the plurality of flat surface portions is folded back so as to be parallel to other flat surface portions adjacent thereto. ing.

Further, the mounting circuit board 30 is connected to the drive section in the diaphragm unit 14, the vibration sensor 16, the actuator unit 20, and the shake correction optical unit 29 by a flexible wiring board (not shown), and the lead wire 3
The contact block 32a is connected by 4.

Although the interchangeable lens barrel for a single-lens reflex camera has been described in this embodiment, the present invention can be applied to a lens barrel integral with a camera body.

[0049]

As described above, according to the present invention,
Since the circuit board and the vibration detecting means are arranged at substantially the same position in the outer circumference of the holding barrel in the optical axis direction and in different circumferential ranges, the circuit board and the vibration detecting means are arranged on the outer circumference of the holding barrel. It can be efficiently arranged without causing interference, and it is possible to realize a small lens barrel or a photographing device while having an image blur correction function.

The circuit board may have a plurality of flat portions facing the outer peripheral surface of the holding barrel, and at least one of the flat portions may be substantially flat with respect to the other flat portions. If they are folded back in parallel, the component mounting area on the circuit board can be increased without increasing the size of the lens barrel.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lens barrel that is an embodiment of the present invention.

FIG. 2 is a front view of the vicinity of a 6-group lens barrel in the lens barrel.

FIG. 3 is a perspective view around the sixth group lens barrel.

FIG. 4 is an exploded perspective view around the sixth group lens barrel.

FIG. 5 is a cross-sectional view of a shake correction optical unit provided in the lens barrel.

FIG. 6 is a system diagram of a conventional vibration isolation system.

[Explanation of symbols]

L1 first lens group L2 second lens group L3 Third lens group L4 4th lens group L5 Fifth lens group (correction lens group) L6a, L6b Sixth lens group 14 Aperture unit 16, 16a, 16b Vibration sensor 20 actuator unit 29 Shake correction optical unit 30 6th lens barrel 30a Board mounting part 33 mounting circuit board 33a Flat part 35 Sensor holding member 35a, 35b shield 56a, 56b urethane foam sheet 57a, 57b Shielding lid 70 Flexible circuit board 71 Second York 72 Permanent magnet 73 coils 74 First York

Claims (5)

[Claims] 1. A lens barrel having a holding barrel for holding a lens, a circuit board on which electronic components are mounted, and a vibration detecting unit for detecting shake of the barrel main body, wherein the circuit board and the vibration are provided. The lens barrel is characterized in that the detecting means is arranged at substantially the same position on the outer circumference of the holding barrel in the optical axis direction and in different circumferential ranges. 2. The vibration detecting means is arranged within a range of arrangement of the circuit board in the optical axis direction and in a range different from the range of arrangement of the circuit board in the circumferential direction. Item 1. The lens barrel according to item 1. 3. The lens barrel according to claim 1, wherein the circuit board has a plurality of flat portions facing the outer peripheral surface of the holding barrel. 4. The circuit board according to claim 3, wherein at least one plane portion of the plurality of plane portions of the circuit board is folded back so as to be substantially parallel to the other plane portions. Lens barrel. 5. An imaging device comprising the lens barrel according to claim 1. Description: