JP2002107784A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of a member for holding the actuator of a lock mechanism and to enhance space efficiency in the arrangement of the actuator. SOLUTION: This lens barrel is equipped with a shake correction lens group L1 correcting shake by moving in a direction nearly perpendicular to an optical axis, a base member 3 supporting the lens group L1, the lock mechanism 20 restricting the movement of a shake correction lens, the actuator 4 driving the mechanism 20, a shielding part 3a extended to the member 3 and provided nearer to an optical axis side than the actuator 4, and a reinforcing rib 3b reinforcing the shielding part 3a and also supporting the actuator 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel having a lock mechanism for holding a shake correction optical system at a predetermined position.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional example of a blur correction lens group of a lens barrel having a blur correction function and a drive unit for driving the same. Base members 51, 53
Is a reference member of the drive unit integrated with the screw 56. The blur correction lens group L1 is incorporated so as to form a group of a photographing optical system by fixing the base member 51 or the base member 53 to the lens barrel main body.

[0003] The holding member 52 is a member for holding the blur correction lens group L1. The holding member 52 is configured such that the plurality of protrusions 52a contact the flat surface 51a of the base member 51. The holding member 52 is moved along the plane 51a by an actuator (not shown) so that the optical axis O
Driving is possible in a direction substantially perpendicular to O.

The blur correction lens group L1 is driven in a direction substantially perpendicular to the optical axis OO in accordance with the output of a shake detection sensor (not shown) to correct image blur due to camera shake and to produce a photograph without blur. You can shoot.

When the blur correction is not performed, the blur correction lens group L1 holds the optical axis of the lens barrel L1 and the optical axis OO of the lens barrel so as to coincide with each other. The reason for this is to maintain the performance of the optical system at its best, and to prevent the blur correction lens group L1 from moving when the lens barrel is carried, causing rattling noise and giving the photographer no discomfort. is there.

In order to hold the blur correction lens group L1 at a predetermined position, a pin 57 is held by a base member 53, and the pin 57 is inserted into a hole 52b formed at a predetermined position of the holding member 52 to correct the blur. A lock mechanism for fixing the lens group L1 at a predetermined position is provided. This pin 57 is driven by the latch solenoid 54. The latch solenoid 54 is fixed to the base member 53 by a screw 55. The latch solenoid 54 has a release direction in the direction A and a lock direction in the direction B. The latch solenoid 54 and the pin 57 are connected by a seesaw lever (not shown).

When locking the blur correction lens group L1 at a predetermined position, the blur correction lens group L1 is driven by an actuator (not shown) to a position at which it is desired to lock. At this position, when a predetermined voltage is applied to the latch solenoid 54, it is attracted in the direction B and overcomes the spring 58 applied to the pin 57, the pin 57 moves in the direction B, and the pin 57
2b, the blur correction lens group L1 is locked at a predetermined position.

On the other hand, when releasing the lock, a predetermined voltage is applied to the latch solenoid 54 to cancel the attraction force, and the force of the spring 58 wins, and the pin 57 is driven in the B direction. The blur correction lens group L1 is unlocked and can be driven in a direction perpendicular to the optical axis OO.

[0009]

In the prior art described above, members such as the latch solenoid 54 and the pin 57 are
Since it is not desired to expose the optical axis due to the problem of appearance, ghost, flare, and the like, a so-called “shading” like the shielding portion 53a is required.

However, on the outer peripheral side of the shielding portion 53a, there are parts of a lock mechanism such as a latch solenoid, and on the inner peripheral side, a sufficient thickness cannot be set and the strength is reduced because the inner peripheral side is regulated by a light beam. There was a problem. Also, the shielding part 53a
There is a danger that the vibration occurs when the shake correction lens group L1 is driven, and resonance occurs to generate sound or adversely affect the position control of the shake correction lens group L1.

An object of the present invention is to solve the above-mentioned problems, and to provide a lens barrel capable of increasing the strength of a member for holding an actuator of a lock mechanism and increasing the space efficiency of disposing the actuator. That is.

[0012]

According to a first aspect of the present invention, there is provided a blur correction lens (L1) for correcting a blur by moving in a direction substantially perpendicular to an optical axis.
And a base member (3, 1) supporting the blur correction lens.
3), a lock mechanism (20, 40) for restricting the movement of the blur correction lens, an actuator (4, 14) for driving the lock mechanism, and the light extending from the base member and being lighter than the actuator. Shielding members (3a, 13a) provided on the shaft side; and reinforcing ribs (3b, 13) for reinforcing the shielding members and supporting the actuator.
b).

According to a second aspect of the present invention, there is provided the lens barrel according to the first aspect, wherein the lens barrel has an area provided on an outer periphery of the blur correction lens, moves integrally with the blur correction lens, and overlaps the base member. The lens barrel is further provided with a brim portion (2), wherein the actuator is disposed in a space extending the overlapping region in the optical axis direction.

[0014] The invention of claim 3 is claim 1 or claim 2.
3. The lens barrel according to claim 1, wherein the reinforcing ribs are joined to the shielding member near the base member and have a rectangular plate shape (3b) extending in the optical axis direction. is there.

[0015] The invention of claim 4 is the invention of claim 1 or claim 2.
3. The lens barrel according to claim 1, wherein the reinforcing knob is a ring-shaped member (13b) having the optical axis substantially at the center, and formed apart from the base member.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in more detail. (First Embodiment) FIGS. 1 and 2 are views showing a first embodiment of a lens barrel according to the present invention. FIG. 1 is a sectional view (II section in FIG. 2) and FIG. Is a side view (view from behind the optical axis). In the following embodiments, portions that perform the same functions as those of the above-described conventional example will be denoted by the same reference numerals at the end, and redundant description will be omitted as appropriate. Therefore, description of the basic structure of the lens barrel is omitted. First
The lens barrel according to the embodiment mainly includes a blur correction lens group L1.
, A holding member 2, a base member 3, a latch solenoid 4, a lock mechanism 20, and the like.

The blur correction lens group L 1 is an optical system for correcting blur by moving in a direction substantially perpendicular to the optical axis, and is supported by the base member 3. The holding member 2
A brim portion is provided on the outer periphery of the blur correction lens group L1 and moves integrally with the blur correction lens group L1 and has a region overlapping with the base member 3. The latch solenoid 4 is disposed in a space extending from the overlapping region in the optical axis direction.

The lock mechanism 20 includes a blur correction lens group L1
Is a mechanism for restricting the movement of the lens unit and holding the blur correction lens group L1 at a predetermined position. The mechanism is a hole 2b formed at a predetermined position of the holding member 2, and is held by the base member 3 and inserted into the hole 2b. 7, a spring 8 for urging the pin 7 in the unlocking direction, a latch solenoid 4 as an actuator for driving the pin 7 in the locking direction, and a latch solenoid 4 And a seesaw lever 9 connecting the pin 7 and the like. The lock mechanism 20 holds the blur correction lens group L at a position where the optical axis of the blur correction lens group L1 substantially coincides with the optical axis of the photographing optical system.

In the first embodiment, as shown in FIGS. 1 and 2, a base member 3 holding a latch solenoid 4 is provided with a shield extending to the base member 3 and provided closer to the optical axis than the latch solenoid 4. And a plurality of reinforcing ribs 3b for reinforcing the shielding portion 3a.
1, a latch solenoid 4 is fixed from the side with screws 5. The reinforcing rib 3b is joined to the shielding portion 3a in the vicinity of the base member 3, and has a rectangular plate shape extending in the optical axis direction (FIG. 1).
It is. The reinforcing ribs 3b are provided at a plurality of locations (seven locations in this embodiment) on the outer peripheral side of the shielding portion 3b in a substantially radial direction.

According to the first embodiment, since the reinforcing rib 3b for reinforcing the shielding portion 3a is provided, the latch solenoid 4 is provided.
Can be given sufficient strength to the base member 3 that holds the motor, and further, problems such as generation of noise due to drive vibration and deterioration of position control do not occur. Further, since the latch solenoid 4 is held by one of the reinforcing ribs 3b, there is no need to provide a dedicated latch solenoid holding section, and space efficiency is improved.

(Second Embodiment) FIGS. 3 and 4 show a second embodiment of a lens barrel according to the present invention.
FIG. 3 is a cross-sectional view (III-III cross section in FIG. 4), and FIG. 4 is a side view (view from behind the optical axis). In the second embodiment, as shown in FIGS. 3 and 4, a base member 13 holding a latch solenoid 14 is provided with a reinforcing rib 1 for reinforcing a shielding portion 13a.
3b is provided in the circumferential direction, and the latch solenoid 14b is
Are fixed with screws 15 from behind the reinforcing rib 13b. The reinforcing knob 13b is a ring-shaped member having the optical axis substantially at the center, and is formed on the outer periphery of the shielding portion 13a and apart from the base member 13.

According to the second embodiment, in addition to the effect of the first embodiment, since the ring-shaped member is provided, there is an effect that the torsion around the optical axis becomes strong.

Various modifications and changes are possible without being limited to the above-described embodiment, and these are also within the equivalent scope of the present invention. For example, the shape of the reinforcing rib is not limited to a rectangle, but may be another shape such as a triangular shape. Also, the actuator may be another type of motor,
The mounting posture of the actuator is not limited to the illustrated one.

[0024]

As described above, according to the present invention, since the reinforcing rib is provided on the shielding member of the base member which holds the actuator such as the latch solenoid, sufficient strength can be given, and furthermore, the driving force can be increased. The generation of sound due to vibration, the deterioration of position control, and the like no longer occur. Further, since the actuator is held by the reinforcing ribs, there is no need to provide a dedicated holding portion, and the space efficiency is good.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a lens barrel according to the present invention.

FIG. 2 is a side view showing the first embodiment of the lens barrel according to the present invention (as viewed from the rear side of the optical axis).

FIG. 3 is a sectional view showing a second embodiment of the lens barrel according to the present invention.

FIG. 4 is a side view (view from the rear side of the optical axis) showing a second embodiment of the lens barrel according to the present invention.

FIG. 5 is a cross-sectional view showing a conventional example of a blur correction lens group of a lens barrel having a blur correction function and a drive unit for driving the same.

[Explanation of symbols]

 L1 Anti-shake lens group 1, 11 Base member 1a, 11a Plane 2, 12 Holding member 2a, 12a Projection 2b, 12b Hole 3, 13 Base member 3a, 13a Shielding portion 3b, 13b Reinforcement rib 4, 14 Latch solenoid 5, 15 Screw 6,16 Screw 7,17 Pin 8,18 Spring 9,19 Seesaw lever

Claims (4)

[Claims] 1. A blur correcting lens for correcting a blur by moving in a direction substantially perpendicular to an optical axis; a base member for supporting the blur correcting lens; and a lock mechanism for limiting movement of the blur correcting lens. An actuator for driving the lock mechanism, a shielding member extending to the base member and provided on the optical axis side of the actuator, and a reinforcing rib for reinforcing the shielding member and supporting the actuator. A lens barrel to be equipped. 2. The lens barrel according to claim 1, further comprising a flange provided on an outer periphery of the blur correction lens, integrally moving with the blur correction lens, and having a region overlapping the base member. The lens barrel, wherein the actuator is disposed in a space extending from the overlapping region in the optical axis direction. 3. The lens barrel according to claim 1, wherein the reinforcing rib is joined to the shielding member near the base member and has a rectangular plate shape extending in the optical axis direction. A lens barrel characterized in that: 4. The lens barrel according to claim 1, wherein the reinforcing knob is a ring-shaped member having the optical axis substantially at the center, and formed apart from the base member. Characteristic lens barrel.