JP2003195138A - Optical element holding device and optical equipment having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optical element holding device capable of accurately adjusting and positioning an optical element in an optical element holding lens barrel, and an optical equipment having the optical element holding device. <P>SOLUTION: In this optical element holding device having the optical element and the optical element holding lens barrel for holding the optical element, the optical element holding lens barrel has an insertion part in which the optical element is inserted, a butting surface abutting on a plane part provided at the periphery part of the optical element when inserting the optical element in the insertion part, and positioning the optical axis direction thereof, three or more tool holes for positionally adjusting the optical element toward an outside diameter on a plane orthogonal to an optical axis on the periphery of the insertion part, and three or more injection holes for injecting an adhesive provided to be equally divided at positions where an angular phase is different from the tool hole, and the optical element is set so that the diameter of its outer peripheral surface may be smaller and smaller as it is separated in the optical axis direction from the plane part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element holding device and an optical device having the same, and is suitable for a lens barrel of a digital camera, a video camera, a film camera, or the like.

[0002]

2. Description of the Related Art Conventionally, various configurations have been proposed for a holding device for holding an optical element such as a lens, a mirror and a filter in a lens holding barrel. Among them, a holding device having an optical adjusting means for improving the total optical performance of the optical system by slightly displacing a specific lens with respect to the other lenses in a plane perpendicular to the optical axis direction in order to improve the optical performance. Is
With the recent trend of high magnification and downsizing of photographing systems, demand is increasing. A so-called parallel decentering adjustment in which a specific lens is finely moved on a plane perpendicular to the optical axis is well known as a method that is often performed in general optical adjustment.

FIG. 5 is a schematic view of a structure / method for parallel eccentricity adjustment that is generally performed conventionally.

In FIG. 5, reference numeral 11 is a lens whose parallel decentering is adjusted, and 12 is a lens holding barrel for holding the lens 11. After adjusting and bonding these two parts,
The product is assembled into a lens barrel together with other parts (not shown). Reference numeral 13 denotes an adjusting table, which holds the lens holding barrel 12 in position by the surface 13a. 14 is the adjusting table 1
It is a micrometer for adjustment that is attached to two places of the three legs 13b extending from 3, and when the outer portion is rotated about the axis, the small-diameter probe 14a that extends in the lens center direction extends in the axis direction. It is a small displacement.
The micrometer 14 itself is a known part of the market and will not be described in detail here.

The probe base 1 is provided at another position of the foot portion 13b.
5, a probe 16 attached to the probe base 15 and capable of moving back and forth in the axial direction, a compression spring 17 for biasing the probe 16 toward the lens center, and a lid 18 fixed to the probe base 15. Reference numeral 19 is an eccentric jig that holds the outside of the effective diameter of the lens 11, and 20 is a weight that is attached to the eccentric jig and that adjusts the load for pressing the lens 11 against the lens holding barrel 12. Reference numeral 21 denotes an adhesive that is coagulated by being dropped substantially uniformly between the lens 11 and the lens holding barrel 12 at three points.

The method of adjusting the lens 11 will be described. First, the lens holding barrel 12 is aligned and held on the adjusting base 13, and then the lens 11 is abutted on the lens holding barrel 2.
Place on 2a. An eccentric jig 19 is placed thereon so as to press the outer diameter of the lens 11 and the surface near the lens outer diameter. After that, the micrometer 14, the probe 16 for urging the spring, and the probe base set 15 are attached to the foot portion 13 b of the adjustment base 13. The required position of the lens 11 is adjusted by applying an appropriate load to the weight 20 and adjusting the micrometer 14. After the adjustment, the adhesive 21 is poured into the illustrated position to fix the same, and then the lens 11 and the lens holding barrel 1
2 is removed and the work is completed.

[0007]

It is necessary to perform parallel eccentricity adjustment in a state where the lens 11 is pressed against the lens abutting surface 12a of the lens holding barrel 12 in the optical axis direction, and to perform bonding while maintaining that state. Therefore, there is a problem that the lens 11 is deformed by the load of the tool applied to the lens 11 and the lens surface through which the effective light flux passes is easily distorted. Also, the lens 11
A tool for pressing the holding lens barrel against the holding barrel is liable to be damaged because it directly presses the lens 11, and in order to press outside the effective range of the lens surface, the pressing tool is increased in size, the outer diameter of the lens itself is increased, However, there is a drawback that the lens holding barrel becomes large.

Particularly, when a plastic lens which has been used widely in recent years is used, the above-mentioned surface distortion of the lens is a serious problem, and a satisfactory optical performance cannot be easily obtained, which is a problem. Was there.

It is well known that, in the bonding used as a means for fixing the lens to the lens holding barrel, the adhesive itself contracts from the time when the adhesive is applied to the time when the adhesive is cured. Since the adhesive itself also expands and contracts due to temperature and humidity, the stress applied to the bonded lens from the adhesive also changes. In order to keep the surface accuracy of the lens and the adjusted position in consideration of this change, it is effective to apply the same amount of the adhesive agent evenly to at least three points on the outer circumference of the circular lens. . However, when the adhesive is applied, it is difficult to apply the same amount of the adhesive evenly because it is a liquid, and some regulation is necessary.

Especially, when the plastic lens is adjusted and adhered, the above adhering conditions are indispensable. In addition, there is no guarantee that the optical performance will not change significantly in the unlikely event that the adhesive is peeled off.

An object of the present invention is to provide an optical element holding device capable of accurately adjusting and positioning an optical element in an optical element holding lens barrel, and an optical device having the same.

In addition to the above, the present invention has an optical element holding device capable of adjusting the eccentricity of the optical element with respect to the optical element holding lens barrel, ensuring sufficient core accuracy and surface accuracy, and obtaining good optical performance. The purpose is to provide optical equipment.

[0013]

An optical element holding device according to a first aspect of the present invention is an optical element holding device having an optical element and an optical element holding barrel for holding the optical element. Is an insertion portion for inserting the optical element, and an abutting surface for positioning the optical element in the optical axis direction by abutting on a flat portion provided in the peripheral portion of the optical element when the optical element is inserted into the insertion portion, On the circumference of the insertion part, three or more tool holes for adjusting the position of the optical element in the plane orthogonal to the optical axis toward the outer diameter, and approximately equal to the position different in angular phase from the tool hole And three or more injection holes for injecting an adhesive, which are provided in the optical element, and the diameter of the outer peripheral surface of the optical element is gradually reduced as the distance from the flat surface portion increases in the optical axis direction. I am trying.

According to a second aspect of the present invention, in the first aspect of the present invention, the optical element passes through the tool hole and is in contact with an outer peripheral surface of the optical element, and a plurality of adjustment tools capable of position adjustment toward an optical axis center. Is finely adjusted and held in a plane perpendicular to the optical axis.

According to a third aspect of the present invention, in the first or second aspect, the injection holes are arranged substantially evenly around the optical axis,
The hole has substantially the same shape, and the width of the hole in the optical axis direction is smaller than the width of the outer diameter portion of the optical element in the optical axis direction. The circumferential range around the optical axis fixes the optical element. It is characterized in that it matches the application range of the adhesive to be applied.

The invention of claim 4 is characterized in that, in the invention of claim 1, 2 or 3, the width of the injection hole in the direction of the optical axis increases as the distance from the optical axis increases.

An optical apparatus according to a fifth aspect of the invention has the optical element holding device according to any one of the first to fourth aspects.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an optical element holding device used in an optical device such as a camera of the present invention will be described together with its adjusting tool.

(Embodiment 1) FIG. 1 is a schematic view showing the structure of a lens holding barrel for adjusting decentering of a lens barrel used in a camera or the like embodying the present invention. 1 (a) is a front view, FIG. 1 (b) is a vertical cross-sectional view showing an AA cross section, and FIG.
(C) is a longitudinal sectional view showing a BB section.

In FIG. 1, reference numeral 1 is an optical element whose eccentricity is to be adjusted, and a lens is shown as an example. Reference numeral 2 is a lens holding barrel as an optical element holding barrel for holding the lens 1. After the two parts of the lens 1 and the lens holding barrel 2 are adjusted and adhered, they are assembled into the lens barrel together with other parts (not shown). Reference numeral 3 denotes an adjusting table, which holds the lens holding barrel 2 in position by the surface 3a.

Reference numeral 4 denotes three legs 3b extending from the adjusting table 3.
It is a micrometer for adjustment that is attached to two of these, and when the outer portion is rotated about the axis, the small diameter probe 4a extending in the lens center direction is slightly displaced in the axis direction. The micrometer 4 itself is a known part that is commercially available and will not be described in detail here. At another position of the foot portion 3b, a probe base 5, a probe 6 attached to the probe base 5 and capable of advancing and retracting in the axial direction, a compression spring 7 for biasing the probe 6 toward the lens center, and fixed to the probe base 5. This is the lid 8.

Next, a method of adjusting the lens 1 will be described step by step. First, the lens holding barrel 2 is aligned and held on the adjusting base 3, and then the flat surface portion or the corner portion 1b of the lens 1 is placed on the abutting surface 2a of the lens holding barrel 2. After that, the micrometer 4 and the spring-loaded probe 6 and a set of the probe base 5 are attached to the foot portion 3b of the adjustment base 3. At this time, the tips of the probe 6 and the micrometer 4 (probe)
4a passes through three hole portions (tool holes) 2b provided on the outer periphery of the lens holding barrel 2 and directly pushes the outer peripheral surface 1a of the lens 1.

FIG. 2 is an enlarged explanatory view of this situation.
In FIG. 2, the point to be noted is that the outer peripheral surface 1a of the lens 1 is inclined with respect to the optical axis 0a of the lens 1, and the direction of the inclination is the contact surface of the lens 1 with the lens holding barrel 2. 2a is a large-diameter portion, and has a shape in which the lens outer diameter gradually decreases and becomes smaller as the distance from the abutting surface increases along the optical axis direction. This is because when the lens 6 is pushed by the probe 6 and the micrometer 4 toward the optical axis 0a by the inclined surface 1a on the outer periphery of the lens, the component force of the force causes the lens 1 to move to the lens holding mirror. This is for pressing against the lens abutting surface 2a of the cylinder 2.

As described above, in this embodiment, a tool for adjusting the eccentricity of the lens is used as a means for pressing the lens in the optical axis direction, and the tool is adjusted in a direction perpendicular to the optical axis, which is the adjustment direction of the tool. It uses the force component of force. For this reason, the outer diameter surface of the lens to be adjusted is made an inclined surface, and the lens is pressed in the optical axis direction toward the abutting surface of the holding barrel.

Due to this action, the eccentric jig which has been conventionally required is unnecessary, and the entire adjusting device can be simply constructed. Further, in the conventional example, since the gravity was used to press the lens against the abutting surface of the lens holding barrel, the direction of the tool could not be changed, but in the configuration of the present embodiment, it can be adjusted sideways or downward. And
The usage is expanded.

The amount of inclination of the outer peripheral surface 1a of the lens 1 varies depending on the material / strength / weight of the lens to which this embodiment is applied and the strength of the biasing spring of the probe. And by operating the three micrometer 4,
The position of the lens 1 is adjusted in a plane perpendicular to the optical axis 0a.

After the adjustment, the hole portion (injection hole) 2c provided on the outer periphery of the lens holding barrel 2 shown in FIGS. 1 (a) and 1 (c).
After injecting the adhesive 9 toward the outer peripheral surface 1a of the lens 1 seen from the inside and fixing the same, the lens 1 and the lens holding barrel 2 are removed, and the position in a plane orthogonal to the optical axis of the lens 1 The adjustment work is completed.

As described above, in the optical element holding device of the present embodiment, the optical element holding barrel for adjusting and fixing the position of the optical element in the plane orthogonal to the optical axis has the optical element in the optical axis direction. An abutting surface to be positioned at, an insertion portion larger than the outermost diameter of the optical element, three or more tool holes formed toward the outer diameter from the insertion portion, and toward the outer diameter from the insertion portion,
3 formed in approximately equal portions at positions different in angular phase from the tool hole
And an injection hole for injecting an adhesive, the optical element has a flat surface portion or a corner portion for determining the position in the optical axis direction, and the outer diameter surface of the optical element is the flat surface portion. Alternatively, the outer diameter is gradually reduced as the distance from the corner in the optical axis direction decreases, and the outer diameter becomes a slope.

FIG. 3 is an enlarged view of the vicinity of the protrusion 2c in this embodiment.

The holes 2c in the present embodiment are oblong holes of the same shape, which are evenly arranged in the circumferential direction, and it is essential that the adhesive 9 is evenly injected so as to fill the holes 2c. Especially when the lens 1 is a lens such as a plastic lens whose contraction of the adhesive and the temperature and humidity of the lens easily change, unnecessary deformation and optical performance can be obtained by arranging the bonding positions evenly and symmetrically around the optical axis 0a. It is possible to suppress changes. The number of bonding locations is not particularly limited, but at least three locations are desirable in consideration of bonding strength.

That is, three or more holes 2c for injecting the adhesive are arranged substantially evenly around the optical axis, and the width in the optical axis direction is smaller than the width in the optical axis direction of the outer diameter portion of the lens. The circumferential range around the axis matches the application range of the adhesive applied to fix the lens.

There is no limitation on the kind of the adhesive 9, and it is necessary to select the most suitable adhesive in a timely manner. For example, in the present embodiment, if the lens is made of glass and the lens holding barrel is made of plastic, the ultraviolet effect is obtained. Using mold adhesive is also an option. It is easier to inject only into the hole 2c if it has an appropriate viscosity before curing, and the curing time by irradiation of ultraviolet rays is as short as several seconds, and the work efficiency is good.

(Second Embodiment) FIG. 4 is a perspective view of the second embodiment.
It is a detailed view of the adhesive injection part in c. The lens 1 and the lens holding barrel 2 after the adjustment / adhesion according to the present embodiment are incorporated into a lens barrel that is a product and used in various environments. For example, the adhesive portion of the lens may be peeled off due to a force such as a drop impact or vibration. If peeled off, the position of the lens will be displaced from the end of the adjustment, so not only the originally required optical performance will not be obtained, but also the lens will come off and interfere with other parts, resulting in a lens barrel product. It may stop working.

Therefore, in the second embodiment, as shown in FIG.
Paying attention to the shape of the adhesive injection hole 2c of the lens holding barrel 2, the adhesive application range is limited in the shape of the inner diameter side of the hole 2c, and the lens holding mirror is used. The width of the hole 2c in the optical axis direction is increased toward the outer peripheral side of the tube 2. That is, the adhesive injection hole has a larger hole width in the optical axis direction in the outer peripheral portion than in the inner peripheral portion of the lens holding barrel.

As a result, the adhesive 9 is applied and cured to form a wedge shape, so that even if the adhesive surface between the adhesive 9 and the lens holding barrel 2 is peeled off, the adhesive adheres to the lens itself. As long as the agent is not removed, the position of the lens 1 does not change significantly, and the worst case is that the lens 1 is less likely to come off the lens holding barrel 2. In addition, there is also an effect of guiding the adhesive at the time of injecting the adhesive, which has an effect of improving workability.

As described above, according to each embodiment, the position of the optical element (lens) is adjusted in the plane orthogonal to the optical axis,
In the optical element holding device for fixing and supporting, the outer diameter surface of the lens itself is a slant surface where the outer diameter is gradually reduced as the distance from the abutment surface to the holding barrel in the optical axis direction increases. This greatly simplifies the configuration of the eccentricity adjustment tool, and enables the lens and the lens holding barrel itself to be downsized and simplified.

Further, since at least three adhesive application areas are evenly provided on the outer peripheral surface of the lens holding barrel, the adhesive application positions and amounts can be easily equalized. Positional accuracy and lens surface deformation are less likely to occur, enabling stable improvement of lens optical performance.

Further, by making the injection hole of the adhesive into a wedge shape, even if the adhesive is peeled off from the lens holding lens barrel, the lens position is not largely changed, and the lens is less likely to be detached and broken. can do.

[0039]

According to the present invention, it is possible to achieve an optical element holding device capable of accurately adjusting and positioning an optical element in an optical element holding lens barrel, and an optical device having the same.

In addition, according to the present invention, the optical element holding device capable of adjusting the eccentricity of the optical element with respect to the optical element holding lens barrel, ensuring sufficient core accuracy and surface accuracy, and obtaining good optical performance, and the same. It is possible to achieve an optical device having

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of a part of FIG.

FIG. 3 is an enlarged explanatory view of a part of FIG.

FIG. 4 is an enlarged explanatory diagram of a part of the second embodiment of the present invention.

FIG. 5 is a schematic view of a conventional lens holding device.

[Explanation of symbols] 1 lens (optical element) 2 Lens holding barrel 3 Adjusting stand 4 Adjustment micrometer 5 probe stand 6 probes 7 Compression spring 8 lid 9 Adhesive 11 lenses 12 Lens holding lens barrel 13 Adjusting stand 14 Adjustment micrometer 15 probe stand 16 probes 17 Compression spring 18 lid 19 Eccentric jig 20 weights 21 Adhesive

Claims (5)

[Claims] 1. An optical element holding device having an optical element and an optical element holding lens barrel holding the optical element, wherein the optical element holding lens barrel has an insertion portion for inserting the optical element and an insertion portion for inserting the optical element. When the optical element is inserted, it abuts on a flat surface portion provided on the peripheral portion of the optical element to position the optical element in the optical axis direction, and on the circumference of the insertion portion, the optical element faces toward the outer diameter. And 3 or more tool holes for position adjustment in a plane orthogonal to the optical axis, and 3 or more injection holes for adhesive injection, which are provided at approximately different positions in angular phase from the tool holes, The optical element holding device is characterized in that the diameter of the outer peripheral surface of the optical element gradually becomes smaller as it goes away from the plane portion in the optical axis direction. 2. The optical element is arranged in a plane perpendicular to the optical axis by a plurality of adjusting tools which pass through the tool hole and contact the outer peripheral surface of the optical element and which can adjust the position toward the optical axis center. The optical element holding device according to claim 1, wherein the position is finely adjusted and held. 3. The injection holes are holes that are arranged substantially evenly around the optical axis and have substantially the same shape, and the width of the hole in the optical axis direction is the optical axis direction of the outer diameter portion of the optical element. 3. The optical element holding device according to claim 1, wherein the range in the circumferential direction around the optical axis is smaller than the width of the optical element and the application range of the adhesive applied to fix the optical element. . 4. The optical element holding device according to claim 1, wherein the hole width of the injection hole in the optical axis direction increases with increasing distance from the optical axis. 5. An optical device comprising the optical element holding device according to claim 1. Description: