JP2776656B2 - Attaching structure of aperture device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a mounting structure of grain Ri device <br/> is that used in a video camera or the like.

[0002]

2. Description of the Related Art Conventionally, a diaphragm blade is opened and closed by a driving source.
By actuating, the light receiving part (CCD etc.) of the camera
A diaphragm device for adjusting the amount of light entering is known.

A conventional diaphragm device is attached to a lens barrel by, for example, a structure shown in FIGS. Figure
3, the throttle device shown in FIG. 4 is an ammeter type motor,
This is a diaphragm device using a so-called iris meter as a driving source. Reference numeral 1 denotes a first lens barrel, and 2 denotes a second lens barrel. A second lens barrel 2 is disposed in front of the first lens barrel 1, and a diaphragm device is disposed therebetween.

The opening and closing movement of the diaphragm device is provided at the front end of the first lens barrel 1.
A blade case 3 for storing a diaphragm blade for adjusting the amount of light by operation is provided, and a ground plate 4 serving as an exterior of the diaphragm device is fixed to the blade case 3 by a ground plate holding portion 3d. The blade case 3, the first barrel 1 and the row Cormorant receiving portion 3b of the position regulation of the direction of the direction odor <br/> Te orthogonal to engage the optical axis orthogonal to the optical axis
There are formed in the form of convexly to the left and right of the case, also the second lens barrel 2 of the rear end and contact with receiving <br/> portion 3c of the position regulating the optical axis direction Ru is performed is formed. 3e is orthogonal receiving portion 3b and the optical axis
Escape up clearance groove and ing when subjected to lateral pressure in the direction, 6
Is the drive source for the aperture blades that adjusts the amount of light by opening and closing
It is an iris meter .

At the front of the first lens barrel 1, diagonal screw holes 1a and fitting bosses 1c are formed, respectively.
In the state where the second lens barrel 2 is
The second lens barrel 2 is mounted on the front part of the first lens barrel 1 in such a manner as to fit into the fitting hole (not shown) of the first lens barrel. 1 and 2 are integrally connected.

Namely, the iris is 1 and the first lens barrel, and the outer shape of the blade case 3, receiving portion 3b of the blade case 3
In performs position restriction in the direction perpendicular to the optical axis, whereas the light in the first lens barrel 1 and the receiving portion 3c of the outer and the blade case 3 constituted gap and the blade casing 3 in the second lens barrel 2
By fixing the axial position regulating in the direction of the optical axis of the throttle device is performed.

[0007]

SUMMARY OF THE INVENTION However, the conventional
There are the following problems in the mounting structure of the aperture device .

When the iris device is fixed, when the dimensional accuracy of the first and second lens barrels 1 and 2 and the blade case 3 is poor, the iris device is liable to rattle, and the optic device is liable to the optical axis of the lens system.
The center of the aperture equipment opening 22 becomes unstable, adversely affect the optical performance.

When the motor for driving the lens or the like is operating, there is a possibility that abnormal noise may be generated due to the play of the aperture device .

[0010] The present invention solves the above problems,
An object of the present invention is to provide a diaphragm device mounting structure capable of improving performance without increasing the number of parts.

[0011]

According to a first aspect of the present invention, there is provided a diaphragm device mounting structure, wherein a receiving portion of the diaphragm device includes a lens.
In the notch of the lens barrel,
The position of the diaphragm device in the orthogonal direction is brought into contact with the diaphragm device.
It is a mounting structure of the aperture device that has been determined, wherein the
The spring device provided on one of the aperture device and the lens barrel is moved forward.
The aperture device and the diaphragm so that a spring force is generated in the orthogonal direction.
By contacting the other end of the lens barrel, the aperture
Of the lens barrel was pressed against the notch of the lens barrel
It is characterized by the following .

[0012]

The mounting structure of the above-described diaphragm device is
For example, by integrally providing the
This spring force pushes the diaphragm device body against the lens barrel.
Press, and the diaphragm device is fitted and held in the lens barrel without play.Let
You.

[0013]

1 and 2 show a first embodiment of a mounting structure of a diaphragm device according to the present invention. In this embodiment, the same members as those of the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

[0014] In this embodiment, integrally forming the charge arm 10 having a spring property to the upper sides of the blade case 3 as the spring means, the distal portion of the charge arm 10 first shoulders of the barrel 1 by engaging the charge groove 1b formed in the section, the charge arm 10 and the blade case
3, the receiving groove 3b of the lens barrel 1 and the cutout
To generate a spring force that clamps the contact portion of the
You.

[0015] Therefore, the blade case 3
Notch of the first lens barrel 1 by the spring force of the storage arm 10
The left and right sides of the blade case 3 engaged with the portion 1d are respectively provided with protrusions.
The receiving portion 3b is pressed against the notch 1d.
Thus, rattling in a direction orthogonal to the optical axis is prevented.

[0016] On the other hand in this embodiment, the rear surface of the charge groove portion 1b which forms the first of the two shoulders of the barrel 1, as shown in FIG. 2, toward the front (the second barrel side) Since the inclined surface is inclined, the component force of the charge arm 10 caused by contact with the inclined surface acts forward, thereby preventing the blade case 3 from rattling in the optical axis direction.

[0017] Incidentally, the above-described embodiment is provided with a charge arm the blade case 3, the tip portion is engaged with the charging groove portion formed on the first barrel 1, 5 and 6 As described above, the charge arms 20 having spring properties are provided on both shoulders of the first lens barrel 1, and the upper end thereof is attached to the blade case 3.
Be engaged with the charge groove portion 21 provided in,
Similar effects can be obtained.

[0018]

As described above, according to the present invention, vibration is generated when the motor for driving the lens or the like is operating, but the diaphragm device including the blade case is pressed by the spring force. Therefore, generation of abnormal noise due to rattling can be prevented.

Further, since there is no need to screw the blade case or the like to the lens barrel, no screw or the like is required, the number of parts can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a mounting structure of a diaphragm device according to the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a sectional view showing a mounting structure of a conventional diaphragm device.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a sectional view of a second embodiment.

FIG. 6 is a side view of FIG. 5;

[Explanation of symbols]

1 ... first barrel 2 ... second barrel 3 ... blade casing 4 ... base plate 5 ... connection bis 6 ... iris meter 10, 20 ... Charge arm 1b, 21 ... Charge groove portion 22 ... openings

Claims (2)

(57) [Claims] 1. A receiving portion of an aperture device is provided with a notch of a lens barrel.
Abut on the contact area in the direction perpendicular to the optical axis.
Performs the positioning of the aperture device in the orthogonal direction.
Mounting structure of the diaphragm device, wherein the diaphragm device
Spring means provided on one side of the lens barrel in the orthogonal direction
The diaphragm device and the lens barrel are moved so that a spring force is generated.
By contacting the other end, the receiving portion of the aperture device
A diaphragm device mounting structure, wherein the diaphragm device is pressed against a notch of the lens barrel . 2. The apparatus according to claim 1, wherein said lens barrel comprises a front barrel and a rear barrel.
Having the diaphragm device, the front lens barrel and the rear lens barrel
Between the rear barrel and the diaphragm unit.
A groove for contacting the spring means is formed;
The part is such that the diaphragm device is pressed against the front barrel.
To apply the component force of the spring force in the optical axis direction.
The mounting structure for an aperture device according to claim 1, further comprising a surface .