JPH075352A - Lens supporting barrel frame - Google Patents

Abstract

PURPOSE:To perform aligning work without touching a lens surface after housing a lens in a supporting barrel frame by providing a piercing and adjusting hole which is opened on the peripheral surface of the lens housed inside. CONSTITUTION:A lens 111 is pressed to the barrel fitting frame 115 at the end of the supporting barrel frame 113 by tightening a presser ring 114 in the frame 113. Then, an adjusting hole 116a is obliquely provided toward a center axis in the frame 113 at a position corresponding to the peripheral surface of the lens 111. A pin rod 119a for positional adjustment is inserted in the adjusting hole 116a and abuts on the peripheral surface of the lens. In such a case, mechanical force is exerted on the lens 111 from the outside by the pin rod 119a for positional adjustment, so that the lens 111 is finely moved. Then, the aligning work is performed without touching the lens surface after housing the lens 111 in the frame 113.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel for a camera and various other optical devices, and more particularly to a lens support barrel for holding a lens in a regular internal position.

[0002]

2. Description of the Related Art Usually, a lens group is provided with a plurality of lenses incorporated in a supporting barrel. For example, a configuration in which a lens barrel is used as a lens support barrel and a plurality of lens groups are combined in this barrel, or a lens group is combined in a separate lens support barrel and incorporated into the lens barrel Can be taken.

In the lens group consisting of a plurality of single lenses in the lens supporting barrel, it is necessary that the center axis of the lens supporting barrel and the optical axes of the single lenses are substantially aligned. If this goes wrong, the focus will deteriorate, and there will be a difference in the resolving power between the vertical lines and the horizontal lines not only at the periphery of the screen but also at the center, and the descriptiveness of the lens will be greatly reduced.

On the other hand, individual single lenses can be polished by mechanically controlled polishing or the like so that the deviation of the optical axis of each lens surface of the single lenses hardly occurs.

Therefore, in order to accurately align the optical axes of the lens groups (hereinafter referred to as centering), when the individual single lenses are attached to a lens support barrel such as a lens barrel, each single lens is individually attached. It is necessary to perform the centering work for the lens support barrel to attach it.

For example, FIG. 7 is an explanatory view showing an example of attachment of a single lens to a lens supporting barrel. As shown in the figure, in order to insert the first single lens (1) into the supporting barrel (2) having the barrel frame (4) formed at one end, the first single lens is inserted.
A small gap is required between (1) and the support shell (2).
Due to this gap, the first single lens (1) may be slightly inclined with respect to the central axis (3).

Therefore, if the first single lens (1) is not centered, even if the second single lens and the subsequent lenses are accurately attached to the supporting barrel, the lens group as a whole will naturally have high accuracy. Becomes worse. Therefore, it is necessary to mount each single lens while performing the centering work on the support barrel. Conventionally, this centering adjustment is performed manually by touching the lens surface with a finger.

[0008]

However, fine adjustment of the inserted single lens requires skill, is troublesome, and has a problem that the surface of the single lens is easily soiled. Further, when the subsequent single lens is mounted, the single lens inside cannot be finely adjusted, and furthermore, the centering work of the glass-contacting parts requires a high degree of skill.

The present invention has been made in order to solve the above problems, and requires no skill in centering work for glass-contacting parts, and enables highly accurate centering adjustment without touching the lens surface. The purpose is to obtain a supporting barrel.

[0010]

According to a first aspect of the present invention, there is provided a lens support barrel for holding a lens in a predetermined regular position inside thereof.
It is characterized in that a through-adjustment hole opened on the peripheral surface is provided so that a pin rod for position adjustment can be brought into contact with the peripheral surface of the lens housed inside from the outside.

According to a second aspect of the present invention, there is provided the lens supporting barrel according to the first aspect, wherein the adjusting hole is obliquely provided toward a central axis of the supporting barrel.

According to a third aspect of the present invention, there is provided the lens supporting barrel according to the first aspect, wherein a plurality of the adjusting holes are provided in the circumferential direction of the supporting barrel.

According to a fourth aspect of the present invention, there is provided a lens supporting barrel according to the first aspect, further comprising a through hole for injecting an adhesive agent into a gap between the lens supporting surface and the lens peripheral surface in the supporting barrel. It is what

According to a fifth aspect of the present invention, there is provided the lens supporting frame according to the fourth aspect, wherein the inner peripheral surface is provided with a communication groove in the circumferential direction which communicates with the through hole.

[0015]

The lens supporting barrel of the present invention is a lens supporting barrel for holding a lens in a predetermined regular position inside, and adjusts the position from the outside with respect to the peripheral surface of the lens housed inside. Since it is characterized by having a through adjustment hole that opens on the peripheral surface so that the pin rod for use in contact can be contacted, by applying a mechanical force from the outside to the lens by the pin rod for position adjustment, The position of the lens can be moved minutely, and the centering work can be performed without touching the lens surface after the lens is housed in the support barrel.

The adjustment hole is formed so as to open on the peripheral surface of the lens in the support barrel. The pin rod inserted into this adjustment hole applies a mechanical force to the lens to adjust the eccentricity and inclination of the lens.

For example, for fine adjustment of a lens held by a support barrel integrally provided with a barrel mounting frame projecting inward at one end, a pin rod is provided through a position adjusting hole provided in the support barrel around the lens. Insert and adjust the position. A method of inserting the pin rod into the adjustment hole may be a screw-in type, or may be simply loosely inserted.

The adjustment hole has a size into which the pin rod can be inserted, and the size and direction of the hole are not limited as long as the inserted pin rod can center the lens. For example, if the adjustment hole is provided substantially vertically toward the center axis of the support barrel, the diameter of the pin rod is made considerably smaller than the diameter of the adjustment hole to allow the adjustment hole to have a play so that the support barrel is To be able to move freely.

As the operation at the time of centering work, the method of aligning the optical axis of the lens with the central axis of the supporting barrel by fixing the supporting barrel and adjusting the inclination of the lens, and fixing the lens to the supporting barrel There is a method of aligning the center axis of the supporting barrel with the optical axis of the lens by moving the lens, and the operation procedure is not particularly limited as long as accurate centering is performed, but the supporting barrel of the present invention is used. As a centering method in such a case, it is preferable to fix the lens with a pin rod and move the supporting barrel to perform the centering.

As a measuring device for determining whether or not the optical axis of the lens and the central axis of the supporting barrel match, there are a method of making light incident from a light source and utilizing transmitted light, a method of utilizing reflected light, and the like. . An eccentricity measuring device that uses reflected light is commercially available. In addition to this, there is a method of using the matching of the transmitted light and the resolution.

The lens finely adjusted by the adjusting hole is finally fixed to the lens supporting frame. There are various preferable fixing means, and for example, they may be temporarily fixed in the supporting barrel with an adhesive and then firmly fixed by a retaining ring. If the finely adjusted lens does not move when the press ring is attached, the press ring can be fixed by itself. Further, if the fixing of the adhesive is effective for a long period of time, it is possible to fix the adhesive only.

If at least one adjusting hole is provided, it is possible to adjust the position in at least one direction. For example, if a vertical adjustment hole is provided toward the central axis, the lens can be moved in a certain direction perpendicular to the central axis direction by a position adjusting pin rod inserted therein. Alternatively, the lens can be moved in the circumferential direction by providing the lens circumferential surface with an adjustment hole into which a pin rod capable of applying a circumferential force is inserted.

Further, in the case where the adjustment hole is obliquely provided toward the center axis of the support barrel, the pin rod inserted in the adjustment hole also tilts toward the center axis of the support barrel and contacts the lens peripheral surface. . For this reason, the operating force by the pin rod can obtain both a component directed inward in the radial direction and a component directed in the optical axis direction, and the positions of both of them can be adjusted.

Further, in the case where a plurality of adjustment holes are provided in the circumferential direction of the lens support barrel, the pin rods can be inserted into the respective adjustment holes to restrain the lens from a plurality of directions, and the lens can be externally applied to the lens through the pin rods. By moving the mechanical force toward the optical axis from a plurality of directions, it becomes possible to adjust the position of the lens which is decentered in all directions with respect to the central axis of the support barrel.

For example, when a lens is supported and fixed by a pin rod to move the support barrel during centering work using this support barrel, the adjustment holes are provided in at least three directions. The positions of the at least three adjustment holes may be arbitrary positions as long as the lens can be supported centrically by the three pin rods inserted therein. Specifically, if the plurality of adjustment holes are provided at substantially equal intervals in the circumferential direction of the support barrel, the lens can be stably held.

Alternatively, for example, when the supporting barrel is fixed and the lens is moved by the pin rod during the centering operation using this supporting barrel, the adjustment holes are provided at at least two non-opposing positions spaced in the circumferential direction. Set up. As a result, the position can be adjusted with respect to the eccentricity (tilt) of the lens. Considering workability, it is desirable to increase the number of adjustment holes to some extent. If the number of adjustment holes is increased, the movement adjustment direction of the lens can be increased accordingly, and fine adjustment is possible.

In order to inject the adhesive into the gap between the lens barrel and the peripheral surface of the support barrel, a through hole provided separately in the support barrel is used. That is, after positioning the lens in the support barrel, by injecting an adhesive from the outside through the through hole into the gap with the lens peripheral surface in the support barrel, the peripheral surface of the lens accommodated in the support frame is fixed. It can be fixed to the supporting frame with an adhesive. In this case, it is preferable to determine the position of the through hole so that the lens surface will not be covered with the adhesive and the lens surface will not be contaminated with the adhesive during the bonding.

However, the position of the through hole is not particularly limited as long as the lens inscribed in the lens supporting barrel can fix the lens at a predetermined regular position inside. That is, it may be provided in the vicinity of the adjustment hole separately from the adjustment hole, or the adjustment hole may also serve as the through hole.

The number of through holes is at least 1 in the circumferential direction.
One lens may be provided, and at least one may be provided for one lens, or at least one may be provided for a plurality of lenses if the adhesive spreads to adjacent lenses.

In the present invention, a communication groove communicating with the through hole may be further provided on the inner peripheral portion of the support barrel. As a result, the adhesive injected through the through hole enters the communication groove, and the lens peripheral surface and the supporting barrel are fixed to each other by the linearly or planarly spread adhesive portion. Therefore, it becomes possible to more firmly fix the lens with the adhesive.

Further, when the required amount of the adhesive is injected from the through hole, the communicating groove is filled with the excess adhesive,
The effect of eliminating the protrusion of the adhesive on the lens surface is also obtained. For example, if an adhesive having a refractive index different from the refractive index of the lens is applied to the lens surface portion, the reflection of incident light may increase at that portion, which may cause a decrease in optical accuracy. It is best to avoid protruding to the surface as much as possible.

When a plurality of lenses are successively accommodated in the support barrel, the first lens is centered and adjusted as described above, and then the second lens is accommodated and brought into contact with the first lens. . In this case, the polishing surfaces of the first lens and the second lens having good dimensional accuracy may be brought into contact with each other.

The optical axis of the second lens and the central axis of the supporting barrel are aligned and fixed to the supporting barrel by the same method as when the optical axis of the first lens and the central axis of the supporting barrel are aligned. . In this way, the operation of aligning the optical axis of each of the accommodated lenses with the central axis of the supporting barrel is repeated.

A metal is preferably used as the material of the supporting frame of the present invention, which is inexpensive, easy to process the perforations, and has little expansion due to the temperature difference, so that it can be mass-produced accurately.

The pin rod may be removably attached so that it can be removed after the centering work. In this case, the adjusting hole can also be used as an air hole communicating with the inside of the support barrel. When the pin rod is attached to the support barrel, for example, an adhesive may be injected into the adjustment hole to bond the pin rod to the support barrel, and the portion protruding from the support barrel may be cut off. In this case, if the material of the pin rod is the same as that of the support barrel, the difference in thermal expansion is small, and a favorable result can be obtained in terms of appearance. As described above, if the pin rod does not affect the lens optical system of the final product, the handling after the centering work is not particularly limited.

When a circumferential communication groove communicating with the through hole is provided in the inner peripheral portion of the support barrel, a plurality of communication holes may be formed in the support barrel in advance before the through hole is drilled. Good.
For example, when the support barrel is molded from a plastic material or a metal material, the molding groove may be provided with a communication groove portion in advance. Further, the communication groove may be formed at the same time when the adjustment hole is formed, or may be formed by a method corresponding to each material and design specification of the supporting barrel.

[0037]

[Example] Example. 1 Figure 1 is a half-cut axisymmetric cross-sectional view showing an embodiment with a lens fixing structure of the lens support cylinder frame of the present invention. As shown in the figure, the lens 111 is pressed into the body mounting frame 115 at the end of the support body frame by tightening the pressing ring 114 in the support body frame 113.

Adjustment holes 116a and 116b (here, 11
Only 6a is shown. ) Is provided obliquely toward the central axis on the support barrel 113 at a position corresponding to the peripheral surface of the lens 111. Pin rods 119a and 119b (here, 1
Only 19a is shown. ) Are adjustment holes 116a and 1 respectively
It is inserted in 16b and is in contact with the lens peripheral surface.

FIG. 2 is a sectional view taken along line XX 'in FIG. The adjustment holes 116a and 116b are provided at two positions on the circumferential direction of the support barrel 113 at intervals of 90 degrees, and the pin rods 119a and 119b are inserted into the adjustment holes 116a and 116b, respectively. The support barrel 113 is fixed by an external jig (not shown), and the pin rods 119a and 119b are moved in and out to finely move the lens 111 to perform centering. Thereby, the optical axis of the lens is aligned with the central axis of the supporting barrel.

Example. 2 FIG. 3 is a semi-axial symmetrical sectional view showing another embodiment of the lens supporting barrel of the present invention. As shown in the figure, the lens 211,
212 is accommodated in a support barrel 213 in a contact state.
The lens 211 is first accommodated, then the lens 212 is accommodated, and these lenses are pressed against the body mounting frame 215 at the end of the supporting body frame by tightening the pressing ring 214.

Adjustment holes 216a, 216b, 216c (only 216a is shown here) and 217a, 21.
7b and 217c (only 217a is shown here) are provided at positions corresponding to the peripheral surfaces of the lenses 211 and 212 of the support barrel 213 and perpendicular to the central axis of the support barrel 213.

Pin rods 219a, 219b, 219c
(Only 219a is shown here) and 220a,
220b and 220c (only 220a is shown here) are adjusted holes 216a, 216b and 216c, respectively.
And 217a, 217b, 217c,
The diameter of each pin rod is considerably smaller than the diameter of the adjustment hole, and it has a movement allowance for centering adjustment.

FIG. 4 is a sectional view taken along the line YY 'in FIG. Adjustment holes 216a, 216b for the lens 211,
216c are provided in three places at equal intervals in the circumferential direction of the support barrel 213. Furthermore, the adjustment hole 2 for the lens 212
17a, 217b, and 217c (not shown in FIG. 4) are also provided at three positions at equal intervals in the circumferential direction of the support barrel 213.

Three adjustment holes 216a, 216b, 21
6c includes pin rods 219a, 219b and 21 respectively.
9c is inserted, and similarly the adjustment hole 2 for the lens 212
Although not shown in the drawing, pin rods 220a, 220b, 220c are inserted into 17a, 217b, 217c, respectively.

Here, the pin rods 219a, 219b,
The lens 211 is fixed to an external jig (not shown) by 219c, and the support barrel 213 is moved to perform centering. After the lens 211 is temporarily fixed, similarly, the lens 212 is fixed to the external jig by the pin rods 220a, 220b and 220c, and the support barrel 213 is moved to perform centering. Eventually, both lenses 211 and 212 are holding rings 2.
It is fixed to the support frame by the tightening of 14.

Example. 3 FIG. 5 is a semi-axially symmetrical sectional view showing still another embodiment of the lens supporting barrel of the present invention. In this example, the through hole 321 for injecting the adhesive is the adjustment hole 316 on the peripheral surface of the support barrel 313.
And the adjustment hole 317. Each adjustment hole 31
6, 317 are inclined with respect to the central axis similarly to the example shown in FIG. After centering and adjusting each lens 311 and 312 in the same manner as described above, both lenses are pressed against the body mounting frame 315 by the pressing ring 314, and then an adhesive is injected from the through hole 321 and fixed. The centering work can be facilitated by injecting the adhesive during the centering work and utilizing the semi-solidified state.

Example. 4 is a semi-axial symmetrical sectional view showing still another embodiment of the lens supporting barrel of the present invention. The adjustment holes 416 and 417 are provided obliquely toward the central axis on the peripheral surface of the support barrel 413. In this example, the communication groove 422 communicates with the through hole 421 and is provided on the entire inner peripheral surface of the support barrel 413. The communication groove 422 is for expanding the adhesive in the circumferential direction when the adhesive is injected from the through hole, thereby expanding the adhesion region.

[0048]

As described above, the present invention is provided with the through adjustment hole opened on the peripheral surface so that the pin rod for position adjustment can be brought into contact with the peripheral surface of the lens housed inside from the outside. Therefore, the position of the lens can be moved minutely by externally applying a mechanical force to the lens with the pin rod for position adjustment, and the lens surface is not touched after the lens is housed in the support barrel. Centering work can be performed.

Further, if the adjustment hole is obliquely provided toward the center axis of the support barrel, the pin rod inserted in the adjustment hole is also tilted toward the center axis of the support barrel and abutted on the lens. The operation force by the pin rod can obtain both a component directed inward in the radial direction and a component directed in the optical axis direction, and the positions of both of them can be adjusted.

Furthermore, if a plurality of adjustment holes are provided in the circumferential direction of the lens supporting barrel, the pin rod can be inserted from a plurality of directions, and the position of the lens tilted in any direction with respect to the central axis of the supporting barrel can be adjusted. It will be possible.

Furthermore, in the present invention, a through hole for injecting an adhesive may be provided in a gap between the lens peripheral surface in the supporting barrel and the lens peripheral surface in the supporting barrel through the through hole. It is possible to inject an adhesive into the gap between and to bond the lens inside the support barrel.

[Brief description of drawings]

FIG. 1 is a half-cut axisymmetric sectional view showing an embodiment of a lens supporting barrel of the present invention.

FIG. 2 is a cross-sectional view taken along the line X-X ′ in FIG.

FIG. 3 is a half-cut axisymmetric sectional view showing another embodiment of the lens supporting barrel of the present invention.

4 is a cross-sectional view taken along the line Y-Y ′ in FIG.

FIG. 5 is a semi-axial symmetrical sectional view showing still another embodiment of the lens supporting barrel of the present invention.

FIG. 6 is a half-cut axisymmetric sectional view showing still another embodiment of the lens supporting barrel of the present invention.

FIG. 7 is an axisymmetric sectional view showing an example of a conventional lens supporting barrel.

[Explanation of symbols]

 111 ... Lens 113 ... Support Trunk Frame 114 ... Holding Ring 115 ... Trunk Attachment Frame 116a ... Adjustment Hole 119a ... Pin Rod

Claims (5)

[Claims] 1. A lens supporting barrel for holding a lens in a predetermined regular position inside, wherein a pin rod for position adjustment can be brought into contact with the peripheral surface of the lens housed inside from the outside. A lens support body frame having a through-adjustment hole that opens on the peripheral surface as described above. 2. The lens supporting barrel according to claim 1, wherein the adjusting hole is obliquely provided toward a central axis of the supporting barrel. 3. The lens supporting barrel according to claim 1, wherein a plurality of the adjusting holes are provided in a circumferential direction of the supporting barrel. 4. The lens supporting barrel according to claim 1, further comprising a through hole for injecting an adhesive into a gap between the lens barrel and the peripheral surface of the supporting barrel. 5. The lens supporting barrel according to claim 4, wherein an inner peripheral surface is provided with a communication groove in a circumferential direction that communicates with the through hole.