JP2000275489A - Lens adjusting frame device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens adjusting frame device capable of adjusting the position of a lens while avoiding deterioration of the lens optical characteristics and having a simple structure. SOLUTION: A lens barrel with a lens adjusting frame device incorporated therein has a fixed frame 1, a first lens holding frame 3 incorporated into a cam ring 2 and comprising an outer ring part 3a and an inner ring part 3b holding a lens, and a second lens holding frame 7. The inner ring part 3b is supported against the outer ring part 3a via upper and lower plate spring parts 3c. The outer ring part 3a is provided with right and left arm parts 3e for pressing the inner ring part 3b and a screw hole. An adjusting screw 6 is threadably engaged in the screw hole and is adjusted to rotate the arm part 3e about its fulcrum to enable the position of the inner ring 3b to be adjusted in the direction of the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens adjusting frame device capable of adjusting a lens position with respect to a frame portion.

[0002]

2. Description of the Related Art Conventionally, a lens position adjusting mechanism disclosed in Japanese Patent Application Laid-Open No. Hei 9-113787 is related to a lens adjusting frame device capable of adjusting a lens position with respect to a frame portion. A lens frame device comprising: a frame portion; and a cam formed on the lens portion and a cam follower formed on the frame portion, which are brought into contact with each other, and are rotated relative to each other. The position is determined at the time of assembling.

[0003]

However, in the lens position adjusting mechanism disclosed in Japanese Patent Application Laid-Open No. Hei 9-113787, it is necessary to rotate the lens unit at the time of adjustment. The rotation operation is difficult to perform in a state of being incorporated in a device such as a small camera, and the rotation adjustment may naturally rotate the lens to deteriorate optical characteristics.

Further, it is not desirable to rotate the lens of an aspherical lens which has been frequently used in recent years due to its characteristics. In such a case, the lens position adjustment is required. This limits the range of rotation adjustment of the mechanism.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a lens structure which is less likely to deteriorate the optical characteristics of a lens and has a simple structure and which can adjust a lens position in a predetermined direction. It is an object to provide a frame device.

[0006]

According to a first aspect of the present invention, there is provided a lens adjusting frame device, comprising: a frame portion; a parallel moving portion for moving the frame portion only in parallel; and an adjusting mechanism for functioning the parallel moving portion. And adjusting the position of the frame part by causing the parallel movement part to function by the adjustment mechanism part.

According to a second aspect of the present invention, there is provided a lens adjusting frame device, a lens frame for holding a lens, a spring for moving the lens frame only in the optical axis direction of the lens, and a screw for operating the spring. An adjusting mechanism, wherein the lens frame, the spring, and the screw adjusting mechanism are integrally formed, and the adjusting mechanism causes the spring to function,
Adjust the position of the lens frame.

According to a third aspect of the present invention, in the lens adjusting device according to the second aspect, the direction of the screw of the screw adjusting mechanism is a direction orthogonal to the optical axis of the lens.

According to a fourth aspect of the present invention, in the lens adjusting device according to the second aspect, a screw direction of the screw adjusting mechanism is parallel to an optical axis of the lens.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a lens barrel including a lens adjustment frame device according to a first embodiment of the present invention. FIG. 2 is a front view of the lens barrel, and FIG.
FIG. 3 is a bottom view of the lens barrel. FIG.
It is -B sectional drawing. 5A is a cross-sectional view taken along line AA of FIG. 2, and FIGS. 5B and 5C are cross-sectional views taken along line CC of FIG. 2, of which FIG. FIG. 5C shows a state in which the adjustment screw is not mounted, and FIG. 5C shows a state in which the adjustment screw is mounted. As shown in FIG. 2, the vertical axis passing through the optical axis O at right angles to the optical axis O is defined as the Y axis, and the horizontal axis is defined as X.
Axis.

The lens barrel according to the present embodiment is incorporated in an optical device such as a camera. In particular, a lens in which the position of the built-in lens in the optical axis direction can be adjusted by the screwing amount of an adjustment screw described later. It is a lens barrel. The configuration is mainly a fixed frame 1 and a frame member that is fitted into the inner peripheral portion of the fixed frame 1 so as to be able to advance and retreat along the optical axis O, and is a lens adjustment frame device that holds the first group lens 4. Similarly, the first lens holding frame 3 is a frame member that is fitted to be able to advance and retreat, and includes a second lens holding frame 7 that holds the second lens group, and the cam ring 2.

The fixed frame 1 is fixedly supported by the main body and has rectilinear grooves 1a, 1b, 1c extending in the direction of the optical axis O. The first and second lens holding frames 3, 7 are moved in the direction of the optical axis O. It is held so that it can advance and retreat. An opening 1d for adjusting screw adjustment described later is provided at a bottom position corresponding to the adjusting screw hole of the first lens holding frame.

The cam ring 2 is rotatably fitted on the outer periphery of the fixed frame 1, and is rotated to rotate the first lens holding frame 3.
Grooves 2a, 2 inclined with respect to the optical axis O for driving the
b, 2c and an optical axis O for driving the second lens holding frame 7 forward and backward.
Grooves 2d, 2e and 2f inclined with respect to, a cam follower insertion groove 2g at the time of attaching the lens holding frame, and an adjusting screw adjusting opening to be described later at a bottom position corresponding to the adjusting screw hole of the first lens holding frame. A hole 2h is provided.

The second lens holding frame 7 has a second
A group lens 8 is held, and a cam follower 9a,
9b and 9c are fixed.

The first lens holding frame 3 is an outer ring portion 3a to which cam followers 5a, 5b, 5c are mainly fixed on the outer peripheral portion, and a frame portion for holding the first group lens 4 on the inner peripheral portion. The inner ring portion 3b is a portion that integrally connects the outer ring portion 3a and the inner ring portion 3b, and extends in the vertical Y-axis direction orthogonal to the optical axis O and bends in the optical axis O direction. Thus, the plate spring portion 3c forms two upper and lower parallel moving portions that can be elastically deformed.

The outer ring portion 3a has a deformable fulcrum 3f which is a thin constricted portion from a lower portion of its inner periphery.
And left and right arm portions 3e, which are adjustment mechanism portions having a shape that branches into a left and right arc shape and rises, is provided. Further, left and right pressing projections 3g are provided at the tips of the left and right arms 3e. In addition, a screw hole 3i, which is a screw hole forming an adjustment mechanism, is provided below the center of the left and right arm portions 3e and behind the fulcrum portion 3f, into which the adjustment screw 6 is screwed.

The left and right pressing projections 3g are arranged along the X axis orthogonal to the optical axis O, and the adjusting screw holes 3i are aligned along the Y axis orthogonal to the optical axis O. It is arranged. The opening 3k below the outer ring 3a and the opening 3j in the left-right direction are punched holes during molding.

The inner ring 3b has the outer ring 3
Left and right pressed projections 3d protruding at positions facing the left and right pressing projections 3g are provided along the X axis orthogonal to the optical axis O.

In the state before the adjustment screw 6 is screwed into the screw hole 3i in the first lens holding frame 3, FIG.
As shown in (B), the left and right arm portions 3e are slightly inclined rightward, and a state is maintained in which there is a slight gap between the pressing protrusion 3g and the pressed protrusion 3d. .

The state of adjustment of the inner ring by screwing the adjustment screw 6 in the first lens holding frame 3 will be described.
First, when the adjusting screw 6 is screwed into the screw portion 3i of the outer ring portion 3a, the lower contact surface 3h of the arm portion is formed by the tip of the adjusting screw 6.
Is pressed. By the pressing, the arm 3e is rotated by a small angle to the left as shown in FIG.
g presses the left and right pressed projections 3d of the inner ring portion 3b, and deflects the upper and lower leaf spring portions 3c in the optical axis O direction. Since the left and right pressed projections 3d are located symmetrically with respect to the optical axis O, the inner ring 3b moves parallel to the optical axis O by a very small distance along with the bending of the leaf spring portion 3c. The movement of the inner ring 3b causes the first ring
The relative position of the lens group 4 in the direction of the optical axis O is adjusted.

The assembling and adjusting operations of the lens barrel of the present embodiment configured as described above will be described.
First, the second lens holding frame 7 incorporating the second group lens and the first group lens are incorporated, and the adjusting screw 6 is screwed into the screw hole 3.
The first lens holding frame 3 screwed to i is fitted into the inner periphery of the fixed frame 1 while inserting the respective cam followers into the rectilinear grooves 1a, 1b, 1c. Thereafter, the cam ring 2 is fitted to the outer periphery of the fixed frame 1 while inserting the cam follower from the insertion groove 2g.

The lens barrel with the above-described lens holding frame incorporated therein is attached to a lens inspection device (not shown). In the attached state, the opening 1d is opened from the outside of the cam ring 2 and the fixed frame 1.
When the screwdriver is inserted through and 2h to adjust the screwing amount of the adjusting screw 6, as described above, the outer ring portion 3a
The inner ring 3b moves in parallel in the direction of the optical axis O, and adjustment is performed.

The above-described adjustment is performed while observing the image state of the inspection apparatus, and by the adjustment, the relative position of the first lens group 4 held by the inner ring portion 3b with respect to the second group lens 8, or Fine adjustment of the relative position with respect to the cam ring 2 is performed.

Incidentally, the inner ring portion 3 by the adjusting screw 6 is used.
The position adjustment of b does not necessarily need to be performed with the first lens holding frame 3 incorporated in the fixed frame 1 as described above.
If necessary, the first lens holding frame 3 can be used alone.

The fulcrum 3f for supporting the left and right arms 3e is formed integrally with the arms, however, it is not necessarily required to be integral with the arms. Alternatively, they may be connected by a hinge structure using another member.

According to the lens barrel of the first embodiment described above, the first group lens 4 in the direction along the optical axis O depends on the screwing amount of the adjusting screw 6 in the built-in lens adjusting frame device. Since the position adjustment is possible, and the position adjustment is performed only by the parallel movement of the lens group, there is no rotational component at the time of the lens adjustment operation as in the above-described conventional adjustment mechanism, and the optical characteristics of the lens are not changed. Does not deteriorate.

In addition, a simple adjustment operation of adjusting the screwing amount of the single adjustment screw 6 is sufficient, and the first lens holding frame 3 which is an integrally formed member is used as the lens adjustment frame device. It is simple with only the adjustment screw 6 and can be reduced in cost.

Next, a lens holding frame which is a lens adjusting frame device according to a second embodiment of the present invention will be described. The lens holding frame of the present embodiment is different from the lens barrel of the first embodiment in the direction of the screw holes for mounting the adjusting screw of the first lens holding frame 3 incorporated in the lens barrel.

FIG. 6 is a front view of the lens holding frame 30 according to the second embodiment, and FIG. 7A is a sectional view taken along the line AA of FIG. 7 (B) and 7 (C) are cross-sectional views taken along the line BB of FIG. 6, and FIG.
(C) shows a state in which the adjustment screw is mounted.

The lens holding frame 30 of the present embodiment is
The other structure is the same as that of the first embodiment except for the shape of the screw hole for the adjusting screw and the shape of the contact surface thereof. Therefore, the same structural parts are the same in the drawings. And the detailed description will not be given.

In the lens holding frame 30 of the present embodiment, a screw hole 30i into which an adjustment screw 36 for adjusting the parallel movement of the inner ring portion 3b in the direction of the optical axis O is screwed at a position below the outer ring 3a. They are arranged along a direction parallel to the optical axis O.

When finely adjusting the position of the inner ring portion 3b with respect to the outer ring portion 3a, the adjusting screw 30 is screwed into the screw hole 30.
When the screw is screwed into i and screwed in, the tip of the adjusting screw comes into contact with the screw contact surface 30h below the center of the arm 3e, and the left and right arms 3e are tilted forward around the fulcrum 3f. Rotate. By the rotation, the left and right pressing projections 3g press the left and right pressing projections 3d by the left and right pressing projections 3g in the same manner as in the first embodiment, thereby causing the inner ring portion 3b to move in parallel in the optical axis direction to perform position adjustment. Can be.

The first lens holding frame 30 of the second embodiment
Is applied, the screwing adjustment of the adjusting screw 36 is possible from the direction of the optical axis O, and the adjustment is easy depending on the structure of the lens barrel.

Incidentally, the lens holding frames 3 and 30 in each of the above embodiments may be formed of a normal sawn product, a synthetic resin product, a die cast product, or the like. When the lens holding frame is made of a synthetic resin product, the screw hole for the adjustment screw may be formed as a simple through-hole, and a self-tap screw as an adjustment screw may be screwed into the hole.

Based on the embodiments described above, (1) a lens frame for holding a lens, a translation unit for moving the lens frame only in the optical axis direction of the lens,
A lens adjustment frame device comprising: an adjustment mechanism unit that functions as the translation unit.

(2) a lens frame for holding the lens, a translation unit for moving the lens frame only in the optical axis direction of the lens, and an adjustment mechanism unit for functioning the translation unit; It is possible to propose a lens adjustment frame device in which the lens frame, the translation unit, and the adjustment mechanism unit are integrally formed.

(3) The first frame holding the optical element, the second frame, the first frame and the second frame are connected, and these frames are connected to the optical element. A parallel spring mechanism that enables relative movement by being placed in the optical axis direction, and an adjustment mechanism that adjusts relative movement by the parallel spring mechanism,
An adjustment mechanism comprising:

According to the above-described lens adjusting frame device or adjusting mechanism, the parallel moving portion having a simple structure functions to move the lens frame or the frame portion in parallel only in the optical axis direction. Alternatively, the position of the frame can be adjusted.

[0039]

As described above, according to the lens adjusting frame device of the present invention, by operating the parallel moving portion having a simple structure, the frame portion is moved only in the parallel direction, and the position adjustment can be easily performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens barrel incorporating a lens adjustment frame device according to a first embodiment of the present invention.

FIG. 2 is a front view of a first lens holding frame incorporated in the lens barrel according to the first embodiment.

FIG. 3 is a bottom view of the first lens holding frame of the first embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 shows each cross-sectional view of FIG. 2, and FIG.
FIG. 5B is a sectional view taken along line AA of FIG. 2, and FIG.
FIG. 5C is a cross-sectional view illustrating a state in which an adjustment screw is not mounted, and FIG. 5C is a cross-sectional view taken along a line CC in FIG. 2, illustrating a state in which the adjustment screw is mounted.

FIG. 6 is a front view of a lens holding frame which is a lens adjustment frame device according to a second embodiment of the present invention.

7 shows each cross-sectional view of FIG. 6, FIG. 7 (A) is an AA cross-sectional view of FIG. 6, and FIG. 7 (B) is a BB cross-sectional view of FIG. Indicates that the adjustment screw is not attached,
FIG. 7C is a cross-sectional view taken along the line BB of FIG. 6 and shows a state where an adjustment screw is mounted.

[Explanation of symbols]

 3b ... inner ring part (frame part, lens frame) 3c ... leaf spring part (parallel moving part, spring part) 3e ... arm part (adjustment mechanism part) 3i, 30i ... screw hole (screw adjustment mechanism part) 6,36 ... Adjustment screw (Screw adjustment mechanism)

Claims (4)

[Claims] 1. A lens adjustment frame device comprising: a frame portion; a translation portion that moves the frame portion only in parallel; and an adjustment mechanism portion that functions the translation portion. 2. The lens frame, comprising: a lens frame for holding a lens; a spring portion for moving the lens frame only in the optical axis direction of the lens; and a screw adjustment mechanism for functioning the spring portion. A lens adjustment frame device, wherein the spring adjustment portion and the screw adjustment mechanism portion are integrally formed. 3. The lens adjustment frame device according to claim 2, wherein the direction of the screw of the screw adjustment mechanism is a direction orthogonal to the optical axis of the lens. 4. The apparatus according to claim 2, wherein a direction of a screw of the screw adjusting mechanism is parallel to an optical axis of the lens.
The lens adjustment frame device as described in the above.