JPH085882A - Lens holding body - Google Patents

Abstract

PURPOSE:To provide an inexpensive lens holding body simple in constitution, capable of rapidly and accurately positioning and holding an optional lens at a specified position so that mutual alignment of optical axes of lenses may be performed. CONSTITUTION:This lens holding body is provided with a lens holding means 6 pressing the lens 2 on an optical member 4 and positioning and holding it at a specified position, and the lens holding means 6 is provided with plural elastic members 8 elastically deformed so that uniform pressing force may act in the radial direction of the lens 2 in the case of pressing the plural lenses 2 on the optical member 4, a pressing member 10 simultaneously positioning and holding the lens 2 on the optical member 4 by making pressing force act on the lens 2 through the elastic member 8, and flange members 12 protrusively provided on both sides of the pressing member 10 so that the member 10 may be tightened on the specified optical member 4. The pressing member 10 is provided with plural groove parts 10a housing the elastic member 8 and regulates the elastic deformation state of the elastic member 8 within a fixed range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holder for positioning and holding a lens used in a microscope field such as a laser scanning microscope, a copying machine field and a holography field at a predetermined position of a predetermined optical member. .

[0002]

2. Description of the Related Art Conventionally, as this type of technique, for example, Japanese Utility Model Laid-Open No. 57-88109 and Japanese Patent Laid-Open No. 60-55307.
As disclosed in Japanese Patent Publication No. JP-A-2004-115, by positioning the lens barrel itself housing and holding a predetermined lens on a predetermined optical member via a mounting means (for example, a stop band), the lens is positioned in a predetermined optical path. Techniques for making them known are known. Further, for example, Japanese Utility Model Laid-Open No. 55-164606 discloses a reflector panel support device utilizing the above technique.

In each of such techniques, a lens barrel or the like is indirectly fixed and positioned in a predetermined optical path by fixing a lens barrel or the like at a predetermined position via a mounting means (hereinafter, referred to as Conventional Example 1). Called).

On the other hand, for example, Japanese Utility Model Laid-Open No. 55-123912, Japanese Patent Laid-Open No. 60-130708, Japanese Patent Laid-Open No. 63-
No. 2,877,808 and Japanese Patent Laid-Open No. 63-287809 disclose a technique of positioning and holding a plurality of lenses in the optical axis direction by a lens supporting member (hereinafter, referred to as Conventional Example 2).

[0005]

However, in the technique of the prior art example 1, since the lens barrel having the lens accommodated therein in advance is mounted on the predetermined optical member, a plurality of lenses are provided. There is a problem that it becomes difficult to align the optical axes of the lens barrels.

For example, when the optical axes of the first lens barrel and the second lens barrel deviate from each other with respect to the same lens barrel mounting surface, in order to align the optical axes of the first lens barrel and the second lens barrel, It is necessary to process the lens barrel mounting surfaces so that the optical axes of the first and second lens barrels are aligned with each other, or separate mounting means are required.

In this case, since extremely high processing accuracy is required, there is a problem that the processing is troublesome and the manufacturing cost of the entire optical system increases. Further, when using different mounting means, not only each mounting means needs to be configured to correspond to each lens barrel but also high mounting accuracy is required. In this case, there is a structural defect that the mounting is time-consuming and the number of parts is increased to increase the manufacturing cost.

On the other hand, in the technique of the second conventional example, since the lens is held by the lens supporting member having a constant shape, in order to align the optical axes of the lenses, the lens supporting member itself is high. Processing accuracy is required. That is, in order to match the optical axes of the lenses with each other, it is necessary to provide processing accuracy matched to the individual lens diameters, which increases the manufacturing cost of the lens supporting member and consequently the manufacturing cost of the entire optical system. There is a problem that it will end up.

The present invention has been made to solve such a problem, and an object thereof is to quickly and highly accurately position and hold an arbitrary lens at a predetermined position so that the optical axes of the lenses are aligned with each other. An object of the present invention is to provide a low-priced lens holder with a simple structure that can be obtained.

[0010]

In order to achieve such an object, the lens holder of the present invention presses the lens on a predetermined optical member so that the optical axes of the lenses coincide with each other, Lens holding means for positioning and holding the lens at a predetermined position on the optical member is provided.

[0011]

The lens on the optical member is positioned and held at a predetermined position on the optical member by the lens holding means so that the optical axes of the lenses coincide with each other.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens holder according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1 (a),
As shown in (c), the lens holder of the present embodiment has a predetermined optical member 4 so that the optical axes A of the lenses 2 coincide with each other.
It is provided with a lens holding means 6 for pressing the lens 2 upward and positioning and holding the lens 2 at a predetermined position on the optical member 4.

Specifically, the lens holding means 6 is elastically deformed so that when pressing a plurality of lenses 2 arranged on the optical member 4, a uniform pressing force acts in the radial direction of each lens 2. A plurality of elastic members 8, a pressing member 10 for simultaneously positioning and holding each lens 2 on the optical member 4 by applying a pressing force to each lens 2 via these elastic members 8, and this pressing member 10. Predetermined optical member 4
The flange member 12 is provided so as to project along both sides of the pressing member 10 so as to be fastened.

The elastic member 8 corresponds to, for example, a silicon-based, rubber-based or plastic-based elastic member. The pressing member 10 has a substantially semicircular shape whose cross-sectional shape allows the peripheral surfaces of the plurality of lenses 2 to be pressed uniformly, and simultaneously holds the plurality of lenses 2 arranged on a predetermined optical member 4. For positioning and holding, the whole shape is formed as a semi-cylindrical shape extending by a predetermined length.

When pressing the plurality of lenses 2 onto the optical member 4, the pressing member 10 has a uniform pressing force applied to the lenses 2 via the plurality of elastic members 8.
A plurality of groove portions 10a for accommodating the elastic members 8 and regulating the elastically deformed state of the elastic members 8 within a certain range are provided along the longitudinal direction. The groove portions 10a are formed at three equally divided positions along the circumferential direction of the pressing member 10, and the elastic member 8 is adhered or attached inside the groove portions 10a.

The flange members 12 are provided so as to project on both sides of the pressing member 10 along the extending direction of the pressing member 10. By fastening the flange member 12 to the optical member 4 with screws 14, a plurality of flange members 12 are formed. The lens 2 can be pressed and sandwiched between the elastic member 8 and the optical member 4 (FIG. 1).
(See the bottom drawing of (a)). Although the elastic member 8 is not shown in the lower drawing of FIG. 1A, each elastic member 8 is elastically deformed by each lens 2 and compressed into the groove portion 10a.

In the description of this embodiment, the case where a plurality of lenses 2 are positioned and held will be described. The extension length of the pressing portion 10 depends on the number of lenses 2 arranged on the optical member 4. Therefore, it is possible to position and hold one lens 2, for example, by shortening its extension length. In addition, a plurality of lenses 2 (that is,
In the case of simultaneously positioning and holding the state where the optical axis A is continuously bent, by using the pressing portion 10 formed by being bent along the direction of the optical axis A, these plural lenses 2 are simultaneously positioned and held. be able to.

Next, a lens holding method using such a lens holding means 6 will be described with reference to FIGS. 1 and 2. In addition, in FIG. 2, the pressing member 10 is shown for simplicity.
The elastic member 8 is not shown, and only the other configuration of the lens holder is shown.

In the first method, the optical member 4 is provided with a mounting table 4a on which a plurality of lenses 2 (two lenses 2 in FIG. 1C) can be mounted. This table 4a
Is formed with an arcuate recess 4b that matches the outer shape of the lens 2 along the optical axis A direction (that is, the arrangement direction of the lenses 2). When the lenses 2 are placed in this recess 4b,
A surface S connecting the upper end surface 4c of the mounting table 4a and the optical axis A of the lens 2
(That is, the center line) is positioned on the same plane (see FIG. 1).
(See the bottom drawing of (a)).

A pair of regulating members 16 for regulating the position of the lens 2 in the optical axis A direction (that is, the thrust direction) is attached to the mounting table 4a. Each of the restriction members 16 has an opening 16a having a shape substantially the same as the diameter of the lens 2, and extends from both sides of the opening 16a in a direction orthogonal to the opening 16a and is restricted by the restriction member 1.
The mounting table 4a is provided with a fastening portion 16b for fastening it with a screw 18 (see FIG. 2) (see FIG. 1 (b)).

Here, one regulating member 16 is mounted on the mounting table 4a.
After being fastened to one end of the mounting table 4a, the first spacing ring 20a is first brought into contact with the regulation member 16 and the recessed portion 4b of the mounting table 4a.
Place on. Next, the first lens 2 is placed in the recess 4a while being in contact with the first spacing ring 20a. Further, after the second spacing ring 20b is placed in the concave portion 4b in a state of abutting on the first lens 2, the second lens 2 is placed in a state of abutting on the second spacing ring 20b. It is placed in the recess 4b. And finally, the third spacing ring 20
The c is placed in the concave portion 4b in a state of being brought into contact with the second lens 2.

Thereafter, the remaining restricting member 16 is fastened to the other end of the mounting table 4a while being in contact with the third spacing ring 20c. As is clear from FIG. 1 (c),
The length of the mounting table 4a in the optical axis A direction is slightly smaller than the total length in the optical axis direction of the first to third spacing rings 20a, 20b, 20c and the first and second lenses 2. It is formed short.

Therefore, the remaining regulating member 16 is brought into contact with the third spacing ring 20c, and the third spacing ring 20c.
By pressing c, the first to third spacing rings 20a, 20b, 20c and the first and second lenses 2 are sandwiched by the pair of regulating members 16.

The one regulating member 16 fastened to one end of the mounting table 4a functions as an opposition for defining the optical positional relationship of the lens optical system in the thrust direction. Therefore, as described above, the first to third spacing rings 20a, 20b, 20 are provided in the direction of the one regulating member 16 that functions as an impact.
If the remaining restricting member 16 is fastened while pressing c and the first and second lenses 2, the optical positional relationship in the thrust direction can be obtained with high accuracy.

As a result, the optical positioning of the two lenses 2 in the thrust direction is completed without adjusting the optical positional relationship. Next, a direction orthogonal to the optical axis A (that is,
Performs optical positioning in the radial direction.

First, a pressing member 10 (see the upper drawing of FIG. 1A) having a size sufficient for simultaneously positioning and holding two thrust-positioned lenses 2 is prepared, and the flange member 12 is mounted thereon. It fastens to the upper end surface 4c of the stand 4a.

At this time, the elastic members 8 provided in the groove portions 10a of the pressing member 10 are the two lenses 2 and the first member.
Or, they are elastically deformed by being pressed by the outer peripheral surfaces of the third spacing rings 20a, 20b, 20c.

By elastically deforming the elastic member 8,
Two lenses 2 and first to third spacing rings 20
The reaction from the elastic member 8 uniformly acts on the a, 20b, and 20c, respectively, and as a result, the two lenses 2 and the first to the third spacing rings 20a, 20b, and 20c respectively move toward the recess 4b. It is pressed with a uniform pressing force.

As a result, the two lenses 2 and the first to third spacing rings 20a, 20b, 20c are respectively interposed by the elastic member 8 so that the optical positional relationship in the thrust direction is maintained. It is positioned and held between the pressing member 10 and the recess 4b. As a result, optical positioning in the radial direction is completed.

As described above, according to this embodiment, the lens holding means 6 can position and hold the lens 2 directly on the optical member 4, so that the number of parts required for the entire optical system can be greatly reduced, and the manufacturing The cost can be reduced. Further, in the conventional method, in order to align the optical axes of the lenses with each other, highly accurate positioning and processing accuracy with respect to other optical systems are required. Since pressure can be applied to each lens 2, high precision positioning and processing precision with respect to the lens holding means 6 itself are not required. Therefore, the manufacturing cost of the lens holding means 6 itself can be reduced, and the lens 2 can be positioned and held easily and with high accuracy. Furthermore, the lens holding means 6 of this embodiment
Since the elastic member 8 is provided in the lens, the mutual diameters of the lenses 2 to be positioned and held may vary to some extent. That is, in the conventional technique, since the standard of the member for fixing the lens is limited to a certain value, the lens diameter is also required to have a certain processing accuracy. However, according to the present embodiment, even if the lens diameters of the individual lenses vary, the elastic member 8 can apply a pressing force corresponding to the variation to the lenses, so that any type of lens can be used. It is possible to perform positioning and holding simultaneously and with high accuracy.

By applying the lens holding means 6 of this embodiment in the second method, as shown in FIG.
First to fourth lens holding members 22a, 22b, 22
It is possible to position and hold the plurality of lenses 2 held by c and 22d on the mounting table 4a. It should be noted that, for the sake of simplification, the pressing member 10 and the elastic member 8 are not shown in the figure, and only the other configuration of the lens holder is shown.

According to this structure, the fourth lens holding member 22d is connected to the third lens holding member 22c through the spacing ring 24, and the first to fourth lens holding members 22a, 22a, The 22b, 22c, 22d and the spacing ring 24 are optically positioned in the thrust direction by the pair of regulating members 16. Then, similar to the first method described above, the first to fourth lens holding members 22a, 22b, 22c, 22d and the spacing ring 24 are provided.
Is optically positioned in the radial direction by the pressing member 10 via the elastic member 8.

As described above, according to the lens holding means 6 of the present embodiment, not only the lens 2 but also any optical system constituent member can be positioned and held at a predetermined position. In the third method, as shown in FIG.
It is also preferable that the elastic ring 26 is inserted between the second ring 20c and the third spacing ring 20c.

According to such a configuration, the first to the third
The lens optical system including the spacing rings 20a, 20b, 20c and the first and second lenses 2 is elastically pressed in the thrust direction and the radial direction. Therefore, even if optical components other than the lens optical system expand or contract with temperature change, the change in shape can be absorbed by the elastic member 8 and the elastic ring 26. The advantage is that optical distortion can be removed in advance.

In the fourth method, as shown in FIG. 4B, the recess 4b formed in the mounting table 4a has a rectangular shape, and the inner diameter of the recess 4b is equal to the outer diameter of the lens 2. It has consistent dimensions. Although the elastic member 8 is not shown in the figure, each elastic member 8 is elastically deformed by each lens 2 and compressed into the groove portion 10a.

When the lens 2 is placed in such a recess 4b, the lens 2 is improved so that the holding property of the lens 2 is improved.
The optical axis A (that is, the center line) of the upper end surface 4c of the mounting table 4a is
It is positioned below the plane S connecting the two. Then, similarly to the first method, the lens 2 is positioned and held between the elastic member 8 and the recess 4b by fastening the pressing member 10 to the upper end surface 4c of the mounting table 4a.

In the fifth method, as shown in FIG. 4 (c), the recess 4b formed in the mounting table 4a has a V shape. Although the elastic member 8 is not shown in the figure, each elastic member 8 is elastically deformed by each lens 2 and compressed into the groove portion 10a.

When the lens 2 is placed in such a recess 4b, the optical axis A (that is, the center line) of the lens 2 is positioned on the same plane as the surface S connecting the upper end surface 4c of the mounting table 4a. Then, similarly to the first method, the pressing member 10
The lens 2 is positioned and held between the elastic member 8 and the recess 4b by fastening the to the upper end surface 4c of the mounting table 4a.

The present invention is not limited to the configuration of the above-described embodiment, but can be variously modified. For example, as the lens holding means 6, instead of the elastic member 8, it is also possible to apply a pressing member 10 formed of an elastic body which itself elastically deforms. When the lenses 2 are positioned and held by the plurality of mounting bases 4a that are randomly projected, by using the lens holding means 6 in which the pressing members 10 are formed at the positions facing the plurality of mounting bases 4a, respectively. The lenses 2 can be simultaneously positioned and held on the respective mounting tables 4a. As a result, the assembly process of the optical system is greatly reduced, and the manufacturing cost is reduced.

[0040]

According to the present invention, since the lens holding means for pressing the lens on the predetermined optical member to position and hold the lens at the predetermined position on the optical member is provided, the optical axes of the lenses are aligned with each other. It is possible to provide a low-priced lens holder having a simple structure that can quickly and highly accurately position and hold an arbitrary lens in a predetermined portion.

[Brief description of drawings]

FIG. 1A is a perspective view schematically showing a configuration of a lens holding means applied to a lens holding body according to an embodiment of the present invention, and a drawing on the lower side thereof. FIG. 4 is a cross-sectional view showing a state in which the lens is positioned and held by the lens holding means, (b) is a perspective view of the regulating member applied to the present invention, and (c) is a lens holding means and the regulating member. FIG. 4 is a cross-sectional view showing a state in which is positioned and held.

FIG. 2 is a development view showing a state in which a lens is positioned and held by a lens holding means and a regulation member.

FIG. 3 is a partial cross-sectional view showing a state in which a lens held by a lens holding member is positioned and held by a lens holding body of the present invention.

4A is a cross-sectional view showing a state in which an elastic ring is inserted between a regulating member and a third spacing ring to position and hold a lens, and FIG. 4B is a sectional view showing a rectangular recess. Sectional view showing a state in which the lens is positioned and held on the mounted mounting table,
FIG. 6C is a cross-sectional view showing a state in which the lens is positioned and held on a mounting table on which a V-shaped recess is formed.

[Explanation of symbols]

2 ... Lens, 4 ... Optical member, 6 ... Lens holding means, 8 ...
Elastic member, 10 ... Holding member, 10a ... Groove portion, 12 ... Flange member.

Claims (3)

[Claims] 1. A lens holding means for pressing a lens on a predetermined optical member so that the optical axes of the lenses coincide with each other and positioning and holding the lens at a predetermined position on the optical member. A lens holder characterized by: 2. The lens holding means elastically deforms the lens on the optical member so that a uniform pressing force acts on the lens when the lens is pressed on the optical member. An elastic member for positioning and holding it at a predetermined position is provided.
The lens holder according to 1. 3. The lens holding means includes a pressing member that applies a pressing force to the lens via the elastic member, and when the pressing member presses the lens onto the optical member, A groove portion is provided for accommodating the elastic member and restricting an elastically deformed state of the elastic member within a certain range so that a uniform pressing force acts on the lens via the elastic member. The lens holder according to claim 2.