JP2000352647A - Aligning device for cemented lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be adaptable even if the size of a lens body to be aligned and the curvature of radius of the lens surface are different and to easily execute aligning with high precision in spite of being simple and inexpensive constitution. SOLUTION: This aligning device is provided with rotating means 8, 9, 21 rotating a first lens body 1, position control means 10, 11 for the first lens body 1, a holding member 13 holding a second lens body 2 at the time of sliding the second lens body 2 placed on the first lens body 1, an elastic member 14 pressurizing the second lens body 2 against the first lens body 1, a sliding means 18 sliding the second lens body 2 via the elastic member 14 and the holding member 13, and a control means 17 which detects the deviation of an optical axis from the focal image of light transmitting the first and second lens bodies 1, 2 and which slides the second lens body 2 along the first lens body 1 until the optical axis of the first lens body 1 aligns with that of the second lens body 2 via the sliding means 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for aligning a cemented lens, and more particularly, to an apparatus for aligning a cemented lens used for joining a pair of optical lenses while aligning their optical axes.

[0002]

2. Description of the Related Art Conventionally, when a pair of optical lenses are joined together with their optical axes aligned, a joint lens alignment device disclosed in Japanese Patent Application Laid-Open No. 4-248507 has been used. This alignment device has a configuration as shown in FIG. That is, reference numerals 51 and 52 in FIG. 7 denote a first lens body and a second lens body to be aligned with each other, 53 denotes an eccentric microscope, 54 denotes a light source for radiating natural light, 55 denotes a collimator lens, and 56 denotes a lens. Holders, 57 and 58 are rotating rollers and O-rings for rotating the first lens body 51, 59 and 60 are a pair of holding plates for sandwiching and sliding the second lens body 52 from both sides thereof, and 61 is an objective. A lens 62 is a CCD camera.

The light emitted from the light source 54 is collimated while passing through a collimator lens 55 having a cross chart, and the first lens body 51 and the second lens body whose lens surfaces face each other. The cross-shaped chart image which has passed through 52 and has passed through them is captured by the objective lens 61. The cross chart image captured by the objective lens 61 and captured by the CCD camera 62 is transmitted to the image processing device 63 as control means, and it is determined whether or not the optical axes match. The image processing device 63 is connected to the objective lens 6 via the driver 64.
1 and the operation of a Z-axis stage 65 as a drive mechanism of the CCD camera 62, a stepping motor 66 as a rotating means, and an XY-axis stage 67 as a sliding means.

The lower first lens body 51 placed on the lens holder 56 is provided with an O-ring 58 having a circular shape in cross section externally fitted to the rotating roller 57 while extending along the outer peripheral direction of the lens surface. The first lens body 51 which is to be rotated and is rotating is a fixing means which is a position regulating means provided to receive the first lens body 51 from a direction intersecting the outer peripheral direction of the lens surface. V-shaped regulating plate 6
8, the position is regulated. On the other hand, the second lens body 52 placed on the first lens body 51 with the lens surfaces facing each other rotates together with the first lens body 51, and the first lens body 51 and the second lens body 52 When aligning the optical axes by eliminating the optical axis deviation from
Based on the instruction from 2, the pressing of the pressing plates 59 and 60 causes the lens surface of the second lens body 52 to slide along the lens surface of the first lens body 51.

[0005]

However, in the above-mentioned conventional centering device, the direction in which the facing lens surface expands,
That is, the optical axes of the first lens body 51 and the second lens body 52 are aligned only by sliding along the X and Y directions, and these lens surfaces are flat or nearly flat. In some cases, Z perpendicular to the lens surface
Since there is no need to consider the movement in the direction, it is possible to perform high-precision alignment work. However, when the lens bodies 51 and 52 have a small radius of curvature of the lens surface, they are slid by the holding plates 59 and 60. Since it is necessary to consider the movement of the second lens body 52 to be moved along the Z direction, it is difficult to perform a highly accurate alignment work.

In the conventional structure, the second lens body 52
Is rotated by an O-ring 58 having a circular shape in a sectional view, and the amount of eccentricity is determined with reference to the outer peripheral end face of the first lens body 51 that matches the outer peripheral direction of the lens surface. Measurement and positioning are performed, but as long as such a configuration is present, the optical axis will vary. Further, the light source 54 provided in the conventional alignment device, that is, the first lens body 5
The light source 54 for obtaining the combined focal image of the first and second lens bodies 52 is a halogen lamp, a metahalide lamp, or the like. However, as long as the light source 54 that emits natural light is used,
As a result of the occurrence of chromatic aberration and field curvature aberration, the alignment accuracy is adversely affected.

The present invention has been made in view of these inconveniences, and can be applied even if the size of the lens body to be aligned and the radius of curvature of the lens surface are different, and has a simple and inexpensive configuration. Nevertheless, an object of the present invention is to provide an alignment apparatus for a cemented lens that can easily perform high-precision alignment.

[0008]

An alignment apparatus for a cemented lens according to the present invention performs alignment of an optical axis of a first lens body and a second lens body whose lens surfaces face each other. Rotating means for rotating the first lens body along the outer peripheral direction of the lens surface; position regulating means for receiving the first lens body from a direction intersecting the outer peripheral direction of the lens surface to regulate the position; When the second lens body placed on the first lens body is slid in a state where the second lens body is slid, a holding member for holding the second lens body, and the second lens body is connected to the first lens body via the holding member. An elastic member that presses against
Sliding means for sliding the second lens body through the elastic member and the holding member;
An optical axis shift is detected from a light source that irradiates light transmitted through the lens body and a focal image of light transmitted through the first lens body and the second lens body. Control means for sliding the lens surface of the second lens body along the lens surface of the first lens body until the optical axes of the lens bodies coincide with each other. According to the above configuration, it is possible to perform alignment even when the size of the lens body and the radius of curvature of the lens surface are different, and easily perform high-accuracy alignment despite the simple and inexpensive configuration. The advantage is that it can be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An alignment apparatus for a cemented lens according to a first aspect of the present invention includes a rotating means for rotating a first lens body along an outer peripheral direction of a lens surface, and a rotating means for rotating the first lens body on the lens surface. Position regulating means for receiving and regulating the position from a direction intersecting with the outer peripheral direction, and a second lens for sliding the second lens body mounted on the first lens body with the lens surfaces facing each other. A holding member for holding the body, an elastic member for pressing the second lens body against the first lens body via the holding member, and a sliding for sliding the second lens body via the elastic member and the holding member A light source that emits light that is collimated and transmitted through the first lens body and the second lens body;
The shift of the optical axis is detected from the focal image of the light transmitted through the first lens body and the second lens body, and the second lens is moved via the sliding means until the optical axes of the first lens body and the second lens body match. Control means for sliding the lens surface of the body along the lens surface of the first lens body.

According to a second aspect of the present invention, there is provided an alignment apparatus for a cemented lens according to the first aspect.
A virtual position where the optical axis is expected to be coincident is determined from the focal image locus of the light transmitted through the first lens body and the second lens body, and the second lens body is slid via the sliding means until the virtual position is reached. It is characterized by being. A centering device for a cemented lens according to a third aspect of the present invention is the one described in the first or second aspect, wherein the holding member comprises a first member.
A support member for slidably supporting the lens surface of the second lens body at a position opposite to the lens surface facing the lens surface of the lens body is provided.

According to a fourth aspect of the present invention, there is provided an alignment apparatus for a cemented lens according to the first or second aspect, wherein the holding member has an annular shape, and the second lens body is provided with a lens surface. Is characterized in that a chamfered portion sandwiched from a direction intersecting the outer peripheral direction is formed along the inner peripheral end. An alignment apparatus for a cemented lens according to a fifth aspect of the present invention is the alignment apparatus according to any one of the first to fourth aspects, wherein the position regulating means is provided at a position separated from the outer peripheral edge of the first lens body. It is characterized in that a pair of abutting members that are in contact with each other are provided, and a separation interval between these abutting members can be changed. An alignment apparatus for a cemented lens according to a sixth aspect of the present invention is the alignment apparatus for a cemented lens according to any one of the first to fifth aspects, and is irradiated from a light source and transmitted through the first lens body and the second lens body. The light is characterized by being monochromatic light.

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing an entire configuration of a centering device for a cemented lens according to Embodiment 1, and FIG. 2 shows a centering mechanism provided in the centering device. It is a perspective view. In these figures, reference numeral 1 denotes a first lens body, 2 denotes a second lens body, 3 denotes an eccentric microscope, 4 denotes a light source such as an incandescent lamp for irradiating natural light, and 5 denotes a light source provided with a cross chart. 6 is a lens holder, 7 is an auxiliary lens that changes the focal length of the first lens body 1 and the second lens body 2 whose lens surfaces face each other, and 8 and 9 are First lens body 1
A rotating roller and an O-ring constituting rotating means for rotating the lens, 10 is a fixing V-shaped regulating plate serving as a position regulating means, and 11 and 11 are mounted on the fixing V-shaped regulating plate 10 and are the first lens body. 1 is a pair of bearings that function as contact members that contact each separated position of the outer peripheral end face, and these bearings 11 and 11 together with the fixing V-shaped restricting plate 10 constitute position restricting means.

Reference numerals 13 and 14 in the drawing denote an annular holding member and an elastic member serving as sliding means for sliding the second lens body 2, specifically, a leaf spring member. Reference numeral 16 denotes a CCD camera, and reference numeral 17 denotes an image processing device functioning as control means, for example, a personal computer. The alignment device is configured by using these various devices and members. At this time, the fixed end portion of the leaf spring member 14 is connected to the XYZ axis stage 18 functioning as a sliding means so that the leaf spring member 14 can operate in the horizontal direction and the vertical direction. A holding member 13 for holding the lens body 2 is attached to a free end. Although the holding member 13 has a ring shape, the holding member 13 is not necessarily formed in a ring shape, and any shape and material may be used as needed. Furthermore, the shape and the spring constant of the leaf spring member 14 are not limited, and it is a matter of course that the leaf spring member 14 may have an arbitrary shape and a selected spring constant.

That is, the alignment apparatus according to the present embodiment performs the optical axis alignment of the first lens body 1 and the second lens body 2 whose lens surfaces face each other. A rotating roller 8 and an O-ring 9 for rotating the body 1 along the outer peripheral direction of the lens surface;
And a pair of bearings 11, 11 for receiving and regulating the position from a direction intersecting the outer peripheral direction of the lens surface, and the second lens body 2 mounted on the first lens body 1 with the lens surfaces facing each other. An annular holding member 13 for holding the second lens body 2 when sliding, a leaf spring member 14 for pressing the second lens body 2 against the first lens body 1 via the holding member 13, An XYZ axis stage 18 functioning as sliding means for sliding the second lens body 2 via the member 13 and the leaf spring member 14, and the collimator lens 5
The light source 4 irradiates light transmitted through the first lens body 1 and the second lens body 2 after being collimated, and an optical axis from a focal image of light transmitted through the first lens body 1 and the second lens body 2. Of the first lens body 1 and the second lens body 2 via the XYZ axis stage 18 until the optical axes of the first lens body 1 and the second lens body 2 coincide.
A personal computer 17 which is a control means for sliding the lens surface of the lens body 2 along the lens surface of the first lens body 1 is provided.

The O-ring 9 fitted to the rotating roller 8 here is made of a flexible material such as rubber, and the O-ring 9 in FIG. However, it is a matter of course that the O-ring 9 having the same circular shape in cross section as in the related art as shown in FIG. 2 may be used. However, when the shape is rectangular when viewed in cross section, a better frictional state is secured between the outer peripheral end surface of the first lens body 1 than when the shape is circular when viewed in cross section. Is thought to be smooth. The personal computer 17 determines a virtual position where the optical axes are expected to coincide with each other from the focal image locus of the light transmitted through the first lens body 1 and the second lens body 2, and the virtual position is determined via the XYZ axis stage 18. Of course, the second lens body 2 may be slid to the position.

Next, the operation of the centering device according to this embodiment will be described. First, the lower first lens body 1 placed on the lens holder 6 is rotated along the outer peripheral direction of the lens surface by the O-ring 9 externally fitted to the rotating roller 8, and is rotated. First lens body 1
The position of the outer peripheral end surface is regulated by a pair of bearings 11 mounted on the fixing V-shaped regulating plate 10 at each of spaced positions. The first lens body 1 and the second lens body 2
When the lens bodies 1 and 2 are joined to each other by performing the alignment, a UV curable adhesive or the like is dropped on the lens surface of the first lens body 1 in advance. Further, at this time, when the second lens body 2 is mounted on the first lens body 1 with the lens surfaces facing each other, the mounted second lens body 2 rotates together with the first lens body 1. The light emitted from the light source 4 passes through the collimator lens 5 and the auxiliary lens 7, becomes parallel light, and transmits through the first lens body 1 and the second lens body 2 whose lens surfaces face each other. Will do.

The cross chart image of the light transmitted through the first lens body 1 and the second lens body 2 draws a circular focus image locus on the objective lens 15 having a diameter corresponding to the eccentricity of the cemented lens. That is, the cross chart image captured by the objective lens 15 and captured by the CCD camera 16 is transmitted to a personal computer 17 which is an image processing device. Further, the transmitted cross-chart image is input to the image memory of the personal computer 17, and the recognition of the focal image at each sampling time is executed to determine whether or not the optical axes coincide with each other. As long as the optical axis 17 determines that the optical axes do not match, the servo motor 21 constituting the rotating means and the XYZ axis stage constituting the sliding means are provided via the driver 19 until the optical axes coincide. 18 are operated by feedback control.

Therefore, when the optical axis of the first lens body 1 and the optical axis of the second lens body 2 are eliminated and the optical axes coincide with each other,
The leaf spring member 14 connected to the XYZ axis stage 18 based on the instruction from the personal computer 17
The plate spring member 14 operates in the direction
The holding member 13 slides the lens surface of the second lens body 2 along the lens surface of the first lens body 1 by, for example, 0.5 μm at a time due to the torsional action and the elastic action. . It is determined that the optical axes coincide with each other by the personal computer 17 because the cross chart image moves on the objective lens 15 despite the fact that the first lens body 1 and the second lens body 2 are rotated. It is when it is gone.

When a performance comparison test was performed on the alignment device according to the present embodiment in comparison with a conventional alignment device, the following results were obtained.
That is, first, a cemented lens for a video camera consisting of a pair of lens bodies whose lens surfaces face each other was manufactured. Prior to the performance comparison test, the outer diameter was 8 mm, the edge thickness was 2 mm, and A biconcave lens whose eccentricity falls within 1 minute is referred to as a first lens body 1 (51), and has an outer diameter of 6.3 mm, an edge thickness of an outer peripheral end face of 1.5 mm, and a lens to be joined. 2. The radius of curvature of the surface is 3.
A positive meniscus lens having a thickness of 8 mm and having an eccentricity within 1 minute as a single product was prepared as the second lens body 2 (52), and an ultraviolet-curable resin having a viscosity of 1000 CPS was prepared as an adhesive. Then, when several tens of cemented lenses were manufactured using the alignment device having the conventional configuration, an eccentricity amount of 3 minutes or more resulted in poor alignment accuracy, and From the holding plates 59 and 60 to the second lens body 5
In some cases, alignment was impossible as a result of the deviation of 2.

On the other hand, in the centering device described in this embodiment, the outer diameter of the holding member 13 is 5.6 mm, the inner diameter is 3.8 mm, the thickness is 0.5 mm, and the spring constant of the leaf spring member 14 is Was set to 1.3 g / mm, and a cemented lens having the same configuration as described above was produced by using this alignment device. In this case, the auxiliary lens 7 is a plano-convex lens, that is, a plano-convex lens in which one lens surface is flat while the other lens surface has a radius of curvature of 5 mm. Since the diameter is 3.8 mm, the inner diameter of the lens holder 6 and the effective light beam diameter of the auxiliary lens 7 are 3.8 mm in advance.
It is adjusted so that it becomes above. As a result, with the alignment apparatus according to the present embodiment, the work time required for alignment is not only 3 seconds for measuring the amount of eccentricity and 1 second for alignment, but also for any cemented lens. 30 alignment accuracy
Within seconds, it was confirmed that high alignment accuracy could be secured. Therefore, as long as the alignment device according to the present embodiment is used, it is understood that high-precision alignment can be performed even for a cemented lens having a small radius of curvature of the lens surface.

(Embodiment 2) FIG. 3 is a cross-sectional view showing an alignment mechanism provided in an alignment apparatus according to Embodiment 2, and FIG. 4 is a cross-sectional view showing a modified example thereof. In addition,
Since the overall configuration of the alignment device according to the present embodiment is the same as that of the first embodiment, that is, as shown in FIG. 1, the description of the alignment device itself is omitted here, and FIG.
In FIG. 4 and FIG. 4, the same members and portions as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 3, a centering mechanism provided in the centering device according to the present embodiment includes a second lens body mounted on the first lens body 1 with the lens surfaces facing each other. 2
An annular holding member 13 for holding the second lens body 2 when sliding as necessary, and an elastic member for pressing the second lens body 2 against the first lens body 1 via the holding member 13 The leaf spring member 14 has a fixed end connected to an XYZ axis stage 18 which is a sliding means so that the leaf spring member 14 can operate in a horizontal direction and a vertical direction. At the same time, a holding member 13 is attached to its free end.

On the surface of the holding member 13 on the side of the second lens body 2, that is, on the inner surface facing the second lens body 2, the holding member 13 makes it impossible for the second lens body 2 to slide. In other words, a support member 25 having an annular shape for performing the operation, that is, a support member 25 that functions as a non-slip component by contacting the lens surface 2 a located outside the second lens body 2 is provided. The support member 2
The shape and material of 5 are not limited, and it is only necessary that the second lens body 2 can be reliably made non-slidable by the holding member 13. In a modification of the alignment mechanism provided in the alignment apparatus, as shown in FIG. 4, a chamfered portion 26 having a predetermined angle is formed along the inner peripheral end of the holding member 13 having an annular shape. The chamfer 26 sandwiches the second lens body 2 to be slid from a direction intersecting the outer peripheral direction of the lens surface.

The centering device according to the first embodiment having the centering mechanism shown in FIG. 2 and FIGS. 3 and 4
When a performance comparison test was performed with the alignment device according to the second embodiment, which includes each of the alignment mechanisms shown in, the following results were obtained. In other words, here, a cemented lens for a video camera is also manufactured, and a pair of lenses in which the radius of curvature of the facing lens surface is close to a flat surface of 350 mm and the amount of eccentricity of a single product is within 1 minute, that is, A biconvex lens having a diameter of 7 mm and an edge thickness of 1 mm, and a biconcave lens having an outer diameter of 8 mm and an edge thickness of 0.5 mm were prepared as a first lens body 1 and a second lens body 2. In this case, the outer diameter of the holding member 13 is 8 mm, the inner diameter is 6.6 mm, and the thickness is 0.5 m.
m, while the spring constant of the leaf spring member 14 is 4.7 g /
mm, and is adjusted in advance so that a predetermined pressing force is applied to the second lens body 2 placed on the first lens body 1.

First, when a cemented lens was produced using the alignment device having the alignment mechanism shown in FIG. 2, a pressing force applied to the second lens body 2 by the leaf spring member 14 was obtained. It has been found that it is difficult to manufacture a cemented lens with high alignment accuracy because the sliding of the second lens body 2 is not stable despite the adjustment of the power. On the other hand, when a centering device including the centering mechanism shown in FIG. 3 is used, the work time required for centering is 3 seconds for measuring the amount of eccentricity and 1 second for centering. It was confirmed that the alignment accuracy of the cemented lens was within 30 seconds.
Further, when a plurality of types of cemented lenses having different radii of curvature were manufactured, although there were some fluctuations due to the pressing force of the leaf spring member 14, the alignment shown in FIG. It has been confirmed that it is preferable to use a centering mechanism, and it is preferable to use the centering mechanism shown in FIG. 4 when performing centering with a curvature radius of 100 mm or more.

(Embodiment 3) FIG. 5 is a plan view showing a centering mechanism provided in the centering device according to the first embodiment, and FIG. 6 is provided in the centering device according to the third embodiment. FIG. 4 is a plan view showing a centering mechanism section. Note that the overall configuration of the centering device itself according to the third embodiment is the same as that of the first embodiment, that is, as shown in FIG. 1, so a detailed description thereof will be omitted here, and FIGS. 6, the same reference numerals are given to members and portions that are the same as those in FIG.

The centering mechanism of the centering device according to the present embodiment is, like the centering mechanism according to the first embodiment, the fixing V-shaped regulating plate 10 and the outer periphery of the rotating first lens body 1. Although a position regulating means including a pair of bearings 11 and 11 functioning as a contact member that comes into contact with each separated position of the end face is provided, the difference from the first embodiment is that the fixing V-shape is used. Bearing 1 mounted on control plate 10
The point is that the spacing between the first and the first 11 can be changed. That is, in Embodiment 1 described above, as shown in FIG. 5, the spacing between the bearings 11, 11 mounted on the fixing V-shaped regulating plate 10 is fixed, but in the present embodiment, In, for example, bearing 1
The fixing V-shaped regulating plate 10 is formed with a long hole in the direction connecting the first 11 and the fixing V-shaped regulating plate 10. The center axis of each bearing 11 is inserted through the long hole. By adopting a fixed configuration (not shown),
Each of the bearings 11, 11 is attached to the fixing V-shaped regulating plate 10 in a state where the position can be changed. The O-ring 9 externally fitted to the rotating roller 8 has a rectangular shape in cross section.

The outer diameter is 3 mm and the thickness is 0.5
A first lens body 1 having an outer diameter of 4.2 mm and a second lens body 2 having an outer diameter of 4.2 mm and a thickness of 1.5 mm are prepared, and a cemented lens is manufactured using the alignment device according to the first embodiment. As a result, the following inconveniences were found. That is, in the centering mechanism of the centering device according to the first embodiment, a sufficient rotational force is sometimes not transmitted from the O-ring 9 having a circular cross section to the first lens body 1, and the first lens body If the contact force F1 between the first lens 1 and the O-ring 9 is set to about 500 g / cm ^2, it becomes difficult to rotate the first lens body 1 smoothly. Therefore, in order to transmit the rotational force in a sufficient state, for example,
If the contact force F1 is increased to about 1 kg / cm ² , a situation occurs in which the second lens body 2 comes off the first lens body 1 and scatters.

When the inventor of the present invention pursues the cause of such inconvenience, in the first embodiment, as shown in FIG. 5, the first lens body 1 rotated by the O-ring 9 is used. Bearing 1 that receives and regulates the position
Since the distance between the first lens 11 and the second lens 11 is constant, the relative angle A determined by the center position of each bearing 11 and the center position of the second lens body 2 is 100 ° or more, and the contact force F1 It has been found that the reason is considered that the change is sensitively reflected and that the degree of adhesion between the first lens body 1 and the O-ring 9 is low. In FIG. 5, the dispersing force of the contact force F1 received by each bearing 11 is described as F2.

On the other hand, in the alignment mechanism provided in the alignment apparatus according to the present embodiment, as shown in FIG.
Bearings 11 mounted on the fixing V-shaped regulating plate 10,
Since the spacing between the eleventh and eleven can be changed, the relative angle A can be set to a small value such as 100 ° or less, for example, 80 °. Therefore, the distance between the bearings 11 and 11 is adjusted and set so that the relative angle A with the first lens body 1 becomes 80 °, and the O-ring 9 having a rectangular shape in cross section is obtained. The first lens body 1 and the second lens having the same shape as described above while the contact force F1 between the first lens body 1 and the O-ring 9 is about 0.5 to ² kg / cm ^2. When a cemented lens composed of the body 2 was produced, a cemented lens having high alignment accuracy could be easily produced. In addition, the bearing 11, used here,
The fact that the outer diameter, thickness, etc. of each 11 is not specified,
Confirmed by the inventor.

(Embodiment 4) The alignment apparatus according to Embodiment 4 is not different in overall configuration from the alignment apparatus described in Embodiment 1, but is irradiated with a collimator lens 5 from a light source 4. The light that is collimated and that passes through the first lens body 1 and the second lens body 2 is monochromatic light. That is, the light source 4 included in the alignment device according to the present embodiment is, for example, a red LED.
It is configured using. Here, it is assumed that the light source 4 itself is configured using a red LED. However, the light source 4 itself does not necessarily need to emit monochromatic light, and a normal incandescent light that emits natural light is used. The outer periphery of a lamp or the like may be covered with a red filter or the like.

By the way, in the alignment apparatus according to the first embodiment described above, the light source 4 is an incandescent lamp for irradiating natural light, but the light emitted from the light source 4 which is an incandescent lamp is Auxiliary lens 7, first
Objective lens 1 transmitted through lens body 1 and second lens body 2
5 and the objective lens 15 captures a cross chart image, the objective lens 15
Even when the focus is adjusted, only a blurred cross chart image may be captured. In addition, as the cross chart of the collimator lens 5 has a smaller line width, a sharper and better cross chart image tends to be obtained, but the cross chart becomes more expensive as the line width becomes smaller. It is difficult to use such a cross chart. In addition, as long as natural light is used, chromatic aberration and field curvature aberration may occur.

The alignment device according to the present embodiment is provided to solve such inconveniences, and includes a light source 4 that emits monochromatic light, for example, a light source 4 that is a red LED.
Is used. According to the performance comparison test performed by the inventor of the present invention, chromatic aberration and field curvature aberration are reduced in comparison with the first embodiment, and CCD sensitivity characteristics are improved. As a result, it was confirmed that the cross chart image captured by the objective lens 15 was much clearer, and that the recognition accuracy of optical axis coincidence was improved to about twice.

[0035]

As described above, the alignment apparatus for a cemented lens according to the present invention can be applied even if the size of the lens body to be aligned and the radius of curvature of the lens surface are different, and it is simple. In spite of the inexpensive configuration, there is an effect that high-accuracy alignment can be easily performed. In particular, with the configuration according to the first and second aspects, even if the lens body has a small or large radius of curvature of the lens surface to be aligned, high-precision adjustment that does not depend on the radius of curvature is achieved. The core is made possible, and the advantage that the production loss when mass-producing the cemented lens can be reduced is secured.

According to the third to fifth aspects of the present invention, it is possible to securely hold the second lens body, and it is possible to smoothly hold the second lens body even if the lens body has a large thickness or a small outer diameter. As a result, various combinations of cemented lenses can be produced with high yield. Furthermore, according to the configuration of claim 6, there is no chromatic aberration or curvature of field, and a clearer focus image can be obtained. As a result, the advantage that the alignment accuracy can be improved is secured. Is done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an entire configuration of a centering device for a cemented lens according to a first embodiment.

FIG. 2 is a perspective view showing a centering mechanism provided in the centering device according to the first exemplary embodiment;

FIG. 3 is a cross-sectional view illustrating an alignment mechanism provided in an alignment apparatus according to a second embodiment;

FIG. 4 is a cross-sectional view illustrating a configuration of a modified example of the centering device according to the second exemplary embodiment;

FIG. 5 is a plan view showing a centering mechanism provided in the centering device according to the first embodiment;

FIG. 6 is a plan view showing a centering mechanism provided in a centering device according to a third embodiment;

FIG. 7 is a cross-sectional view illustrating the overall configuration of a centering device according to a conventional embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first lens body 2 second lens body 4 light source 8 rotating roller 9 O-ring 10 fixing V-shaped regulating plate (position regulating means) 11 bearing (position regulating means) 13 holding member 14 leaf spring member (elastic member) 18 XYZ Axis stage (sliding means) 17 Personal computer (control means) 21 Servo motor

Claims (6)

[Claims] An alignment apparatus for a cemented lens that performs optical axis alignment of a first lens body and a second lens body whose lens surfaces face each other, wherein the first lens body is arranged in an outer peripheral direction of the lens surface. Rotating means for rotating the first lens body in a direction intersecting the outer peripheral direction of the lens surface, and position regulating means for regulating the position by receiving the first lens body in a direction intersecting the outer peripheral direction of the lens surface, and mounted on the first lens body with the lens surfaces facing each other. A holding member for holding the second lens body when the second lens body is slid, an elastic member for pressing the second lens body against the first lens body via the holding member, and an elastic member A sliding means for sliding the second lens body via the holding member, a light source for irradiating parallelized light transmitted through the first lens body and the second lens body, and a first lens body and a second lens Optical axis deviation from the focal image of light transmitted through the body Control means for detecting and sliding the lens surface of the second lens body along the lens surface of the first lens body via the sliding means until the optical axes of the first lens body and the second lens body match. An alignment apparatus for a cemented lens, comprising: 2. The alignment apparatus for a cemented lens according to claim 1, wherein the control unit is supposed that the optical axes match from a focal image locus of light transmitted through the first lens body and the second lens body. A center position of the cemented lens, wherein the virtual lens position is determined and the second lens body is slid to the virtual position via the sliding means. 3. The alignment apparatus for a cemented lens according to claim 1, wherein the holding member is located at a position facing a lens surface facing the lens surface of the first lens body. A centering device for a cemented lens, wherein a support member for supporting a lens surface of a lens body in a non-slidable manner is provided. 4. The alignment apparatus for a cemented lens according to claim 1, wherein the holding member has an annular shape and moves the second lens body from a direction intersecting the outer peripheral direction of the lens surface. A centering device for a cemented lens, wherein a chamfered portion to be sandwiched is formed along an inner peripheral end. 5. A centering device for a cemented lens according to claim 1, wherein the position regulating means comprises a pair of abutting members that are in contact with the outer peripheral edge of the first lens body at every separated position. And a separation distance between the contact members can be changed. 6. The alignment apparatus for a cemented lens according to claim 1, wherein the light emitted from the light source and transmitted through the first lens body and the second lens body is monochromatic light. A centering device for a cemented lens, characterized in that: