JP2001311862A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical equipment capable of preventing a lens barrel from getting larger in its radial direction and securing the degree of freedom in design in a lens where a ring type ultrasonic motor is set as an AF driving means and on which a shake detection means for a vibration-proof device is mounted. SOLUTION: A stepping motor 6 for driving a diaphragm and a vibration gyro 11 for detecting shake are arranged on the same plane perpendicular to an optical axis direction, and such arrangement is set in the state of at least one focal distance even when the diaphragm is moved in a zoom lens and the like. Then, idle space provided for a diaphragm driving means is effectively used, the lens barrel is restrained from getting larger in the radial direction and the space in the optical axis direction is effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus such as a lens barrel having a camera shake detecting means, and more particularly to an arrangement thereof.

[0002]

2. Description of the Related Art It is well known that a number of photographing apparatuses having a correction function for correcting image blur caused by camera shake have been proposed and put to practical use in recent years.

What is important in correcting image blur is a detection means for detecting camera shake. Usually this detection means
In the plane perpendicular to the optical axis, two detectors are required: vertical and vertical detectors and horizontal and lateral detectors. The two-directional detectors are arranged on the same plane perpendicular to the optical axis in the lens barrel. Have been.

[0004]

In recent years, lenses are generally electronically controlled and require space for electronic equipment. By expanding the zoom ratio, space for zoom movement and zoom drive are increased. At present, it is more and more difficult to take up space for new devices due to the complexity of mechanisms such as members. In this case, there is a problem in that, in order to dispose the two detection means for the two directions, a space is excessively taken, so that the diameter is increased in the radial direction or the design is restricted in the optical axis direction.

In order to avoid this, Japanese Patent Laid-Open Publication No. Hei 8-
As disclosed in Japanese Patent No. 94899, there is a method of arranging the detecting means on the same plane as the driving means for AF driving. However, this method is effective only in the case of the AF driving means having a gear train. It cannot be applied to a lens having AF driving means, such as a so-called ring-type ultrasonic motor, which has become widespread.

[0006]

The present invention solves such a problem and can be applied to a lens having a ring type ultrasonic motor as an AF driving means and having a shake detecting means for a vibration isolator. In order to prevent the lens barrel from being enlarged in the radial direction and to secure design flexibility, a driving unit for driving the diaphragm and a detecting unit for detecting blur are perpendicular to the optical axis direction. And the above-mentioned arrangement is attained with at least one focal length even when the diaphragm is moved by a zoom lens or the like. This makes it possible to effectively use the empty space, suppresses the size increase in the radial direction, and effectively utilizes the space in the optical axis direction. Further, by passing electric wiring such as a flexible cable through the remaining space where the aperture driving unit and the shake detecting unit are arranged, it is possible to more effectively prevent the radial size from increasing.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a principal part in the vicinity of the arrangement of the blur detecting means of a single focus lens in which the aperture driving means and the blur detecting means are arranged on a plane perpendicular to the optical axis direction.

In FIG. 1, a lens 1 is held in a mirror room 2. The mirror room 2 is attached to a housing 3 on which a diaphragm device is mounted, and an aperture 4 and a diaphragm 5 which are one of the diaphragm devices are engaged with the housing 3. The stepping motor 6 for driving the aperture is mounted on the housing 3 while being mounted on the motor base 7. Here, the diaphragm drive is performed by the rotation of the diaphragm 5 and the opening and closing of the sector 8 by the driving of the stepping motor 6.

The housing 3 is attached to a fixing member 9 serving as a framework of a lens barrel. Similarly, a vibration gyro 11 serving as a shake detecting means attached to the substrate 10 is also attached. The vibration gyro 11 performs camera shake correction based on information on the obtained shake.

As described above, the diaphragm driving stepping motor 6 and the vibrating gyroscope 11 are arranged on the same plane perpendicular to the optical axis. The ultrasonic motor fixing member 12 is provided outside the stepping motor 6 and the vibrating gyroscope 11.
There is a ring type ultrasonic motor unit 1 outside
3 are arranged. The AF focusing operation is performed by driving the ultrasonic motor unit 13.

The main board 14 is disposed on the mount 17 side with respect to the stepping motor 6 for driving the diaphragm, the vibrating gyroscope 11 and the ultrasonic motor unit 13, and controls the electronic devices in the lens and sends signals to the camera. Are exchanged via the electric contact 19.

FIG. 2 is a sectional view taken along a plane perpendicular to the optical axis of the lens barrel shown in FIG.

In FIG. 2, reference numeral 2 denotes a mirror room, which is mounted on a housing 3 on which a diaphragm device is mounted. A stepping motor 6 for driving the aperture is provided outside the housing 3.
Is attached to the housing 3.

Reference numeral 13 denotes a ring-type ultrasonic motor unit which is fixed to the ultrasonic motor fixing member 12, and two vibrating gyroscopes 11 for shake detecting means are arranged at right angles, and the stepping motor 6 and the diaphragm driving flexible member are arranged. 15 and the camera shake unit flexible 16 are arranged in the same space between the lens mirror chamber 2 and the ultrasonic motor unit 13 including the ultrasonic motor fixing member 12, so that the space is effectively used.

In this embodiment, the stepping motor 6 for driving the diaphragm is used for the diaphragm driving means, the vibrating gyroscope 11 is used for the blur detecting means, and the diaphragm driving flexible 15 and the camera shake unit flexible 16 are used for the electric wiring. .

Although the present embodiment has been described using a stepping motor as the driving means, the aperture driving means is not limited to a stepping motor, but may be a driving lever or a driving shaft or the like. Anything that can detect blur, such as a gyroscope or an gyro, may be used. Naturally, the electric wiring such as the flexible cable also includes the lead wire and the like.

In this embodiment, a single focus lens has been described. However, the present invention can be applied to a zoom lens, and if the stop mechanism does not move, it is the same as the single focus lens described in the above embodiment. In the case of moving by zooming, the stepping motor 6 and the diaphragm driving flexible 15 are at least one focal point within the focal range of the zoom regardless of the zoom driving means of the aperture.
If the flexible unit for camera shake unit 16 is arranged in the same space between the lens mirror chamber 2 and the ring-shaped ultrasonic motor unit 13 including the fixing member 12 for ultrasonic motor, the arrangement effectively utilizes the space. can do.

Although the above is the configuration of each of the embodiments, the present invention is not limited to the configurations of these embodiments, and the AF driving means will be described using a ring type ultrasonic motor in the embodiment. However, it goes without saying that any configuration may be used as long as the configuration can achieve the functions described in the claims.

[0020]

According to the structure of the present invention, the blur detecting means, the electric wiring, and the like are arranged in the remaining space where the driving means for driving the diaphragm is arranged, thereby preventing the radial direction from being enlarged. In addition, the degree of freedom in the space in the optical axis direction can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a side internal mechanism of a lens barrel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along a plane perpendicular to the optical axis of the lens barrel according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lens 2 mirror room 3 housing 4 aperture 5 diaphragm 6 stepper motor 7 motor base 8 sector 9 fixing member 10 substrate 11 vibration gyro 12 ultrasonic motor fixing member 13 ultrasonic motor unit 14 main substrate 15 diaphragm driving flexible 16 shake correction Flexible for unit

Claims (1)

[Claims] 1. An optical apparatus comprising: a diaphragm driving unit for driving a diaphragm mechanism of an optical device; and a blur detecting unit for detecting a blur of the optical device, wherein the diaphragm driving unit and the blur detecting unit are arranged in the optical axis direction. An optical apparatus characterized by being arranged in the same vertical plane.