JP2002098877A - Lens aligning method and bonding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the aligning device of a doublet capable of realizing the reduction of the working cost of the lens and easily performing accurate alignment with simple and inexpensive constitution. SOLUTION: By rotating a 1st lens body 1 through a rotating roller 8 and receiving it by a V-shaped regulating plate for fixing 10 from a direction crossing with the outer peripheral direction of the 1st lens surface of the lens body 1, providing a leaf spring member 14 exerting pressing force in the direction of the lens body 1 on a 2nd lens body 2 in a state where the 1st lens surface of the lens body 1 faces to the 2nd lens surface of the lens body 2, and providing an optical axis detection means for detecting the misalignment of an optical axis from light passing through the lens bodies 1 and 2 from a light source 4, the lens body 2 is made to slide by a 2nd XYZ axes stage 18 and the lens surface of the lens body 2 is made to slide along the lens surface of the lens body 1 until the optical axes of the lens bodies 1 and 2 are aligned.

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 centering device for a cemented lens has been used. This centering device has a configuration as shown in FIG. are doing.

That is, reference numerals 51 and 52 in FIG. 9 denote a first lens body and a second lens body 53 whose optical axes are to be aligned.
Is an eccentric microscope, 54 is a light source for radiating natural light, 55 is a collimator lens, 56 is a lens holder, 57 and 58 are rotating rollers for rotating the first lens body 51 and O
Rings 59 and 60 are an annular holding member 59 and an elastic member 60 for sliding the second lens body 52, 61 is an objective lens, 62 is a CCD camera, and 63 is an adhesive on the joint surface of the second lens body. It is an adhesive curing liquid application device that applies a curing liquid.

First, a first lens body 51 and a second lens body 5
Before joining the two, the first XYZ stage 69 is moved from the adhesive curing liquid applying device 63 onto the joint surface of the second lens body 52 to apply a constant adhesive liquid.

After the first lens body 51 is slowly brought into contact with the joint surface of the second lens body 52 by a first lens body supply device (not shown), the optical axis is adjusted.

[0006] 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 5 whose lens surfaces face each other.
The cross chart image transmitted through the first and second lens bodies 52 and transmitted therethrough is captured by the objective lens 61.

[0007] Note that the light is captured by the objective lens 61 and the C
The cross chart image photographed by the CD camera 62 is transmitted to an image processing device as a control means, for example, a personal computer 64, and the image processing device 64 that determines whether or not the optical axes match is controlled by the driver 65. Through the objective lens 61
And a Z-axis stage 6 as a driving mechanism of the CCD camera 62
6. The operation of the stepping motor 67 constituting the rotating means and the operation of the second XYZ stage 68 constituting the sliding means are controlled.

Further, the lower first lens body 51 placed on the lens holder 56 has an O-ring 58 having a circular shape in cross-section, which is externally fitted to the rotating roller 57, and extends 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 7
The position is regulated by 0.

On the other hand, in the state where the lens surfaces face each other, the first
The second lens body 52 mounted on the lens body 51 rotates together with the first lens body 51, so that the optical axes of the first lens body 51 and the second lens body 52 are aligned and the optical axes coincide with each other. At this time, the lens surface of the second lens body 52 is slid along the lens surface of the first lens body 51 by the holding member 59 and the elastic member 60 based on an instruction from the image processing device 62. Is executed.

[0010]

By the way, a desired optical element can be obtained by heating and press-forming an optical element material of an arbitrary shape as an optical element having a lens surface having an aspherical shape. Generally, molded lenses for video cameras are
Although transferred to the optical axis object by press molding and molded, the outer peripheral side surface other than the lens surface has a variation in weight of the optical element material, an uneven thickness and a molding die of the optical element material generated before molding. Due to misalignment or the like, an optical element whose outer diameter shape varies or is decentered, that is, an optical element in which the optical axis of the lens surface does not coincide with the center of gravity of the optical element may be obtained.

As a means for solving this problem, the above-mentioned press-molded optical element is usually subjected to a centering process in which the outer peripheral side surface is cut symmetrically with respect to the optical axis from the facing lens surface.

That is, conventionally, the first lens body 51 and the second
The lens body 52 has been used as a cemented lens after performing a so-called centering process of shaving the outer peripheral side surface of the lens. The purpose of centering is to align the center of gravity, which is the center of the shape of the cemented lens, with the optical axis, which is the center when light is transmitted, and to ensure the roundness of the outer peripheral side surface of the cemented lens. is there.

In the case of a conventional alignment device, the first lens body 51
Adopts a method that rotates while following the outer peripheral direction of the lens surface, so that centering processing for maintaining the roundness of the outer peripheral surface of the lens is indispensable, but the outer peripheral portion of the second lens body 52 needs to be brought into contact with the system. Since there is no centering, there is no need for centering, and it can be considered as an effective means of reducing processing costs.

However, when the centering-less lens is to be joined by the conventional method, as shown in FIG. 8, the center of gravity 25 of the second lens body 52 and the optical axis 26 are displaced, and the first lens body 51 is displaced. Is stable on the joint surface of
Since the lens surface of the lens body 52 is oblique, the second lens body 52 gradually moves obliquely on the first lens body 51 when measuring the amount of eccentricity, and the first lens body 51 and the second lens body 52 are moved. Even if the optical axis is aligned, high-precision bonding is not possible, and in this situation, measurement of the eccentricity of the bonded lens bonded shows that variations occur. As a result, the alignment accuracy is adversely affected.

That is, when joining a lens that does not perform centering processing in order to reduce the processing cost, the eccentricity accuracy is poor, that is, the upper lens whose center of gravity determined from the optical axis and the outer peripheral surface of the lens is shifted is replaced with the lower lens. When the upper lens is joined, it may be joined in an obliquely bent state until the upper lens becomes stable because the amount of the adhesive effect liquid is not proper.

Further, in the case of a combination of a cemented lens having a deviation amount between the center of gravity of the second lens body and the optical axis at the time of measuring the amount of eccentricity, and a focal position which changes sensitively with respect to the inclination angle of the second lens body 52 When the focal locus of the cross-shaped chart image is read using the objective lens having the set magnification, it is out of the reading range.

The present invention has been devised in view of these inconveniences, and can be applied to a lens body whose center of gravity is not on the optical axis, such as a centerless lens, in the second lens body to be aligned. It is an object of the present invention to provide an alignment apparatus for a cemented lens that can easily perform high-precision alignment, with a simple and inexpensive configuration and capable of further reducing the lens processing cost. .

[0018]

In order to solve the above-mentioned problems, an alignment apparatus for a cemented lens according to the present invention adjusts the optical axes of a first lens body and a second lens body whose lens surfaces face each other. Rotation generating means for rotating the first lens body along the outer peripheral direction of the lens surface;
Position regulating means for receiving and regulating the position of the first lens body from a direction intersecting the outer peripheral direction of the lens surface, and sliding the second lens body mounted on the first lens body with the lens surfaces facing each other. When moving, a holding member that holds the second lens body at a constant pressure, an elastic member that presses the second lens body against the first lens body via the holding member, and an elastic member and the holding member Sliding means for sliding the second lens body through the first lens body, drop applying means for dropping an appropriate amount of adhesive liquid on the first lens surface, means for retracting the drop applying means, and the first lens body being parallelized. A light source for irradiating light transmitted through the second lens body, an optical axis detecting means for detecting a deviation of an optical axis from a focal image of light transmitted through the first lens body and the second lens body, and a sliding means. Until the optical axes of the first lens body and the second lens body match. Characterized in that it comprises a control means for sliding along the lens surface of the second lens body in the lens surface of the first lens element.

According to the above configuration, it is possible to adjust the center even if the center of gravity of the second lens body is not on the optical axis, and it is possible to reduce the processing cost of the lens with a simple and inexpensive configuration. In spite of this, the advantage that high-precision alignment can be easily performed is ensured.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An alignment apparatus for a cemented lens according to a first aspect of the present invention includes a rotation generating means for rotating a first lens body along an outer peripheral direction of a lens surface, and a rotation generating means for rotating the first lens body on the lens surface. A position regulating unit that receives and regulates the position from a direction intersecting the outer peripheral direction of the first lens body and the second lens body that slides on the first lens body with the lens surfaces facing each other. A holding member for holding the lens body at a constant pressure, an elastic member for pressing the second lens body against the first lens body via the holding member, and a second lens body for holding the second lens body via the elastic member and the holding member. Sliding means for sliding;
Drop coating means for dropping an appropriate amount of adhesive liquid on the lens surface,
Means for retracting the drop applying means, a light source for irradiating light that is collimated and transmits through the first lens body and the second lens body,
The optical axis detecting means for detecting the deviation of the optical axis from the focal images of the light transmitted through the first lens body and the second lens body, and the optical axes of the first lens body and the second lens body via the sliding means coincide with each other. And control means for sliding the lens surface of the second lens body along the lens surface of the first lens body until the operation is completed.

According to a second aspect of the present invention, there is provided an apparatus for aligning a cemented lens according to the first aspect of the present invention, wherein an adhesive is applied between the cemented lens surface of the first lens body and the cemented lens surface of the second lens body. The coating amount of the curing liquid is adjusted according to the lens surface shape, and the sliding of the second lens body placed on the first lens body is maintained at a constant force.

According to a third aspect of the present invention, a cemented lens centering device according to the first or second aspect, wherein the cemented lens surface of the first lens body and the cemented lens surface of the second lens body are provided. In the adhesive curing liquid applied in between, the viscosity of the curing liquid is changed according to the shape of the cemented lens surface, and the sliding of the second lens body mounted on the first lens body is maintained at a constant force. It is characterized by.

According to a fourth aspect of the present invention, there is provided a centering device for a cemented lens according to any one of the first, second, and third aspects, wherein the centering device for the cemented lens and the first lens body are arranged in parallel with each other. In the adhesive hardening liquid applied between the cemented lens surfaces of the two lens bodies, the sliding of the second lens body mounted on the first lens body such that the thickness of the adhesive hardening liquid can be adjusted is maintained at a constant force. It is characterized by:

According to a fifth aspect of the present invention, there is provided an alignment apparatus for a cemented lens according to the first aspect, wherein a regulating position of a holding member for holding the second lens body at the time of detecting an optical axis is set via an elastic member. It is characterized in that it is separated from the second lens body by an arbitrary height using the sliding means described above.

According to a sixth aspect of the present invention, there is provided an apparatus for aligning a cemented lens according to the first aspect, wherein the optical magnification of the optical axis detecting means can be arbitrarily changed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view showing the entire configuration of a centering device for a cemented lens according to Embodiment 1, and FIG. 2 is a cross-sectional view and a top view of the cemented lens showing an alignment state. FIG. 3 is a flowchart schematically showing steps up to completion of the cemented lens.

Reference numeral 1 in these figures denotes the first
2 is a second lens body, 3 is an eccentric microscope, 4 is a light source such as an incandescent lamp for irradiating natural light, 5 is a collimator lens having a cross-shaped chart image and collimating the light emitted from the light source 4, 6 is a lens holder, 7 is an auxiliary lens for changing 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 rotations for rotating the first lens body 1. Rotating rollers and O-rings constituting the means, 10 is a fixing V-shaped regulating plate serving as a position regulating means, 11 is a position mounted on the fixing V-shaped regulating plate 10 and spaced apart from the outer peripheral end surface of the first lens body 1. Each of the pair of bearings 11 constitutes a position control unit that functions as a position restricting unit that functions as a contact member that comes into contact with each other.

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, specifically, a leaf spring member. Reference numeral 16 denotes a CCD camera, 17 denotes an image processing device functioning as control means, for example, a personal computer, 23 denotes an adhesive curing liquid application device for applying an adhesive curing liquid on the joint surface of the first lens body, and 24 denotes an adhesive curing liquid application. This is a first XYZ stage for moving the device 23, and a centering device is configured by using these various devices and members.

The leaf spring member 14 at this time is
Has a fixed end connected to a second XYZ stage 18 functioning as a sliding means so as to be able to operate in the horizontal and vertical directions, and has a holding mechanism for holding the second lens body 2. The member 13 is attached to the free end. Note that the holding member 13 here has a ring shape, but is not necessarily ring-shaped, 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 centering device according to the present embodiment comprises a lens supply device (not shown) for applying an adhesive curing liquid to the cemented lens surface of the first lens body 1 and bringing the second lens body 2 into contact with the lens surface. An adhesive curing liquid for performing an optical axis alignment of the first lens body 1 and the second lens body 2 facing each other, and applying an appropriate amount of an adhesive curing liquid on the joint surface of the first lens body 1. A coating device 23, a first XYZ stage for moving the adhesive curing coating device to an arbitrary position, a rotating roller 8 and an O-ring 9 for rotating the first lens body 1 along the outer peripheral direction of the lens surface; A pair of bearings 11 for receiving and regulating the position of the lens body 1 in a direction intersecting the outer peripheral direction of the lens surface, and a second lens body mounted on the first lens body 1 with the lens surfaces facing each other. 2 slide the second lens An annular holding member 13 for holding the body 2, a leaf spring member 14 for pressing the second lens body 2 against the first lens body 1 via the holding member 13, and a leaf spring member 14 via the holding member 13 and the leaf spring member 14. A second XYZ axis stage 18 functioning as a sliding means for sliding the two-lens body 2, and light that is collimated by the collimator lens 5 and passes through the first and second lens bodies 1 and 2. The optical axis deviation is detected from the light source 4 for irradiating the light and the focal image of the light transmitted through the first lens body 1 and the second lens body 2,
The first lens body 1 and the second lens
A personal computer 17 is provided as control means for sliding the lens surface of the second lens body 2 along the lens surface of the first lens body 1 until the optical axis of the lens body 2 matches.

It should be noted that the outer roller 8 is fitted around the rotating roller 8 here.
The O-ring 9 is made of a flexible material such as rubber, and the O-ring 9 in FIG. 1 has a rectangular shape in cross section. Of course it is good. However, when the first lens body 1 has a rectangular shape in cross section, a better friction state is secured between the outer peripheral end surface of the first lens body 1 than in the case of a circular shape in cross section. Is thought to be smooth. Further, the personal computer 17 here calculates a virtual position where the optical axis is expected to be coincident from the focal image locus of the light transmitted through the first lens body 1 and the second lens body, and via the second XYZ stage 18 The second lens body 2 up to the virtual position
Of course, it may slide.

Next, the operation of the alignment apparatus for a cemented lens according to this embodiment will be described. As shown in the flowchart of FIG. 3, first, the O-ring 9 that is externally fitted to the rotating roller 8 along the outer peripheral direction of the first lens body 1 with the bonding surface facing upward by a lens supply device (not shown). The outer peripheral end surface of the one lens body 1 is restricted in position by a pair of bearings 11 mounted at spaced positions on the V-shaped regulating plate 10, and a certain amount of an adhesive curing liquid such as an ultraviolet curing type adhesive is first applied.
It is applied by dripping near the center of the lens body joining surface.

Here, the application amount of the adhesive curing liquid is determined by the area of the joint surface between the first lens body 1 and the second lens body 2.
That is, assuming that a uniform thickness is added to the surface area of the bonding surface, the application volume is determined in advance. The equation to be obtained is: S = 2πr, where r is the radius of curvature of the joint surface, θ is the apex angle of a cone having the circular joint surface as the bottom and the center of the radius of curvature as the vertex.
² × (1−cos θ) × t, and the second lens body 2 with the cemented surface facing down is placed on the first lens body 1 with the lens surfaces facing each other by a lens supply device (not shown). The second lens body 2 is placed and slowly comes into contact with the liquid at a speed at which no air bubbles are mixed. At this time, the applied pressure is adjusted by using a pressure member (not shown) so that the applied adhesive curing liquid spreads uniformly over the entire joint surface and does not protrude.

Further, the placed second lens body 2 is
The first lens body, which rotates together with the lens body 1, and the cross chart light emitted from the light source 4 passes through the collimator lens 5 and the auxiliary lens 7, becomes parallel light, and the lens surfaces face each other. The light passes through the first and second lens bodies 2.

The cross chart image of the light transmitted through the first lens body 1 and the second lens body 2 draws on the objective lens 15 a circular focus image locus having a diameter corresponding to the eccentricity of the cemented lens. Captured by the objective lens 15,
Further, the cross chart image photographed 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,
Executes the recognition of the focal image at each sampling time,
As long as the personal computer 17 that determines whether or not the optical axis coincides with the center position of the ring-shaped trajectory determines that the optical axis does not coincide, the personal computer 17 passes through the driver 19 until the optical axis coincides. Then, the servomotor 21 constituting the rotating means and the XYZ axis stage 18 constituting the sliding means are operated by feedback control until the center position of the circular locus coincides with the optical axis.

The ring-shaped holding member 13 is temporarily cured by irradiating ultraviolet rays for curing the adhesive from a first ultraviolet light source (not shown) while keeping the outer peripheral portion of the second lens body suppressed. Is retracted from the second lens body, and the second
UV light is irradiated from the UV light source to completely cure and complete the bonding.

It is determined that the optical axes coincide with each other by the personal computer 17 because the cross chart image is formed on the objective lens 15 even though the first lens body 1 and the second lens body 2 are rotated. Is no longer moving.

By the way, a cemented lens for a video camera composed of a pair of lens bodies whose lens surfaces face each other is manufactured, and a performance comparison test of the alignment apparatus according to the present embodiment with a conventional alignment apparatus is performed. did. Prior to the performance comparison test, the outer diameter shown in FIG.
And the amount of eccentricity as a single item is the first lens body 1 (51).
Is a centered biconcave lens that fits within one minute. The outer diameter is 9 mm, the diameter of the lens processing surface is 7 mm, the edge thickness is 0.7 mm, and the radius of curvature of the lens surface to be joined is 5. A centering-free positive meniscus lens having a eccentricity of about 5 minutes and having a decentering amount of about 3 minutes was prepared as the second lens body 2 (52), and had a viscosity of 1000C.
PS ultraviolet curable resin was prepared as an adhesive.

The second lens body 2 without centering is shown in FIG.
, The outer peripheral side surface 28 of the lens body 2 with respect to the optical axis 26
Are not axially asymmetric, the center of gravity position 25 does not coincide with the optical axis 26. The outer diameter of the holding member 13 was about 11 mm, the inner diameter was 6.5 mm, the thickness was 0.5 mm, and the spring constant of the leaf spring member 14 was 1.5 g / mm. When an appropriate amount of an ultraviolet curing liquid is applied using a centering device having a conventional configuration to produce several tens of cemented lenses, the applied volume of the ultraviolet curing liquid is set to about 10 mm ³ which sufficiently spreads over the entire bonding surface. In the case of joining under these conditions, the second lens body 2 shifts to a stable state around the center of gravity, that is, an oblique state when measuring the amount of eccentricity. In some cases, the eccentricity varies and the alignment accuracy is poor, and in some cases, the calculated coordinates cannot be aligned even though the feedback control is performed.

On the other hand, when the application amount of the adhesive curing liquid in the centering device described in this embodiment is derived from the application volume of the joint surface, the joint surface has a radius of curvature r = 5.5 mm, an arc angle of the joint surface θ ≒ 79 °, adhesive layer thickness t = 0.05 mm
Then, the coating volume V is calculated as V = 4.17 m from the above equation.
m ³ . When it is desired to adjust not the application volume but the application weight, it can be easily calculated by considering the specific gravity of the adhesive curing liquid.

As described above, when joining lenses that are not centered, an appropriate amount of the adhesive effect liquid is calculated in advance so that the upper lens does not bend obliquely, as described above. High-precision joining has become possible.

In this case, the auxiliary lens 7 is a plano-convex lens, that is, a plano-convex lens in which the lens surface on one side is flat and the radius of curvature of the lens surface on the other side is 8 mm. The minimum effective beam diameter is 6.
Since it is 4 mm, the inner diameter of the lens holder 6 and the effective beam diameter of the auxiliary lens 7 are adjusted in advance to be 6.4 mm or more.

As a result, in the centering device according to the present embodiment, the second lens body 2 maintains a constant sliding force to rotate on the joint surface of the first lens body. Even if the center of gravity of the lens body 2 is not on the optical axis, it can be maintained in a stable state in a horizontal state, and the work time required for alignment is 3 seconds for measuring the amount of eccentricity and 1 second for alignment. Not only that, but the alignment accuracy of each cemented lens was within 30 seconds, and it was confirmed that high alignment accuracy could be secured. Therefore, as long as the centering device according to the present embodiment is used, even if the center of gravity of the cemented lens is such that the center of gravity of the lens is not on the optical axis, high-precision centering may be possible. Understood.

In the case of the third aspect, when the second lens body 2 is inclined obliquely when the eccentricity of the first lens body 1 and the second lens body 2 is measured, the viscosity of the adhesive curing liquid is changed. The basic operation is almost the same as that of the first embodiment except for the suppression by changing, and thus the detailed description is omitted.

(Embodiment 2) FIG. 4 is a sectional view showing a sliding means provided in a centering device according to Embodiment 2 of the present invention, and FIG. 5 is an elasticity of the cemented lens according to a radius of curvature. FIG. 6 is a correlation diagram of a pressing force F applied to a member and a thickness t of an adhesive curing liquid. Note that 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, so that the description of the alignment device itself is omitted here. 4 and 5, the same members and portions as those in FIG. 1 are denoted by the same reference numerals.

The sliding means provided in the centering device according to the present embodiment slides the second lens body 2 placed on the first lens body 1 with the lens surfaces facing each other as necessary. An annular holding member 13 that holds the second lens body 2 when the
And a leaf spring member 14 which is 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 a second XYZ axis stage 18 which is a sliding means so that the leaf spring member 14 can operate in the horizontal and vertical directions. The holding member 13 is attached to the free end.

The leaf spring member 14 is an elastic member.
Needs to be replaced with a member having a different spring constant for each radius of curvature of the joint surface between the first lens body 1 and the second lens body 2.
That is, the pressing force applied from the second lens body 2 to the first lens body 1 is changed. This pressing force is applied to the holding member 1.
By moving 3, it is possible to adjust the thickness of the adhesive curing liquid, whereby the position of the center of gravity and the optical axis are shifted.
Even if the lens body 2 is provided, it is possible to stop the oblique inclination phenomenon that occurs when measuring the amount of eccentricity.

The thickness of the adhesive curing liquid is determined by the difference between the center thickness of each of the first lens body 1 and the second lens body 2 before joining and the center thickness of the first lens body 1 and the second lens body 2 after joining. Expressed by The shape and material of the leaf spring members 14 having different spring constants are not limited, and may be any as long as they can adjust the pressing force of the second lens body 2. Further, fine adjustment of the pressing force can be dealt with by changing the height moving distance of the holding member.

By the way, also here, a cemented lens for a video camera is manufactured, and a centering device according to the embodiment and a sliding unit shown in FIG.
A study was conducted on the alignment device according to the above. The cemented lens used for the study had a radius of curvature of 17 m on the facing lens surface.
m, that is, a biconvex lens having an outer diameter of 11 mm, an outer diameter of 12 mm, and a thickness of the outer peripheral side surface of 1.
A 5 mm biconcave lens was prepared as the first lens body 1 and the second lens body 2. Further, as in the first embodiment, an ultraviolet curing agent having a viscosity of 1000 cps is used for the adhesive curing liquid, and the application amount is set so as not to protrude from between the joining surfaces and to spread sufficiently between the joining surfaces.

In this case, while the inner diameter of the holding member 13 is 10.5 mm and the thickness is 0.6 mm,
The spring constant of the leaf spring member 14 is assumed to be 3 g / mm, and adjustment is made in advance so that a pressing force of about 15 g is applied to the second lens body 2 placed on the first lens body 1.

First, when a cemented lens was manufactured using the alignment apparatus shown in FIG. 1, an eccentric amount after bonding of 2 to 6 minutes occurred, and the alignment accuracy was poor. It has been found that a cemented lens is produced. On the other hand, based on the correlation between the bonding thickness and the pressing force shown in FIG.
g / mm and the same distance as described above for the second lens body 2
After the adhesive hardener is strongly pressed toward the side for the time that the adhesive hardener spreads in the joint surface, the annular holding member 13 is once separated from the second lens body 2 and the eccentricity is measured. The phenomenon that the lens body 2 was obliquely shifted during rotation disappeared at all, and bonding was performed in accordance with the calculated optical axis. As a result, it was confirmed that the eccentricity after bonding was within 30 seconds.
Furthermore, when a plurality of types of cemented lenses having different radii of curvature were manufactured, when the second lens body 2 whose optical axis was shifted from the position of the center of gravity and the radius of curvature of the cemented surface was R <50 mm was joined. It has been found from some investigations that the optimum range of the pressing force F and the thickness t of the joint surface is limited.

(Embodiment 3) FIG. 6 is a sectional view of a sliding means provided in a centering device according to Embodiment 3 of the present invention. The overall configuration of the alignment device itself according to the present embodiment is the same as that of the first embodiment, that is, as shown in FIG. 1, so that the detailed description is omitted here, and FIG. Members and portions that are the same as 1 are given the same reference numerals.

The sliding means of the centering device according to the present embodiment comprises a holding member 13 and an elastic member 14 similar to the first embodiment.
Is provided with a second XYZ axis stage 18, but is different from the first embodiment in that the holding member 13 is separated from the second lens body 2 by a certain distance upward to regulate the position when the amount of eccentricity is measured. That is the point. That is, in Embodiment 1 described above, the holding member 13 at the time of measuring the amount of eccentricity is at the retracted position. However, in the present embodiment, for example, the holding member 13 whose optical axis is shifted from the position of the center of gravity is displaced. When the second lens body 2 is tilted obliquely on the first lens body 1 after the two lens bodies 2 are in contact with the liquid, a part of the outer peripheral surface of the second lens body 2
By adopting a configuration that prevents the lens from further tilting by contacting the member surface on the second lens body surface side of No. 3, the focal locus of the cross chart image at the time of measuring the amount of eccentricity can be adjusted by the objective lens 15 and the CCD camera 16. It is possible to fall within a detectable range.

By the way, the first lens body 1 having an outer diameter of 4.2 mm and a thickness of 1.2 mm, the outer diameter being 3.4 mm, the radius of curvature of the joint surface being 3.9 mm, and the position of the center of gravity being shifted from the optical axis. After preparing the second lens body 2 and manufacturing a cemented lens using the alignment apparatus according to the first embodiment, it was found that there were the following inconveniences. That is, when the eccentricity is measured by the sliding means according to the first embodiment, the tilted state, which is a stable position of the second lens body 2, has a large amount of inclination. The focal locus of the photographed cross chart image goes out of the detection range, so that it becomes impossible to calculate the optical axis of the cemented lens and perform the alignment.

On the other hand, in the sliding means according to the present embodiment, as shown in FIG. 6, the regulating position of the holding member 13 at the time of measuring the amount of eccentricity is set above the second lens body 2.
When the first lens body 1 and the second lens body 2 are rotated to measure the amount of eccentricity while being installed at a position separated by about 0.5 mm, when the inclination amount of the second lens body 2 becomes large, the holding member 13 is rotated. Since the protruding outer peripheral upper surface of the lens body 2 comes into contact with the surface of the second lens body surface side, it is theoretically impossible to incline more than the amount of inclination. As a result, the CCD camera 16 Is within the range in which can be detected, the optical axis position can be calculated, and a cemented lens with high alignment accuracy can be easily manufactured.

(Embodiment 4) As shown in FIG. 7, the alignment apparatus according to Embodiment 4 of the present invention does not differ from the alignment apparatus described in Embodiment 1 in the overall configuration, but has a different magnification. There are three different objective lenses, and the rotary table on which the objective lenses are fixed serves as detection means which can be freely rotated by the control means.

When the circular locus of the cross chart image goes out of the detection range of the CCD camera when measuring the amount of eccentricity, the objective lens is set to the low-magnification objective lens and the focal locus is set to C.
If the focal locus is within the detection range of the CD camera but the focal locus is too small, the objective can be changed to a high-magnification objective lens. Variations in the focal locus when measuring the amount of eccentricity can be dealt with by changing the magnification of the objective lens.

That is, the objective lens included in the centering device according to the present embodiment is made of, for example, the same shape having different magnifications, and is automatically adjusted to an optimal objective lens in consideration of the state of the focal locus of the personal computer 17. It has a configuration that can be changed dynamically. Here, although the number and the set magnification of the arranged objective lenses are given as examples, it is not always necessary to make the number and the magnification coincide.

Incidentally, the outer diameter is 8 mm and the thickness is 1 mm.
6. The first meniscus-shaped first lens body 1 having an outer diameter of 7.
A biconvex second lens body 2 having a joint surface with a radius of curvature of 5.3 mm and a center of gravity offset from the center of gravity of 5.3 mm is prepared, and a cemented lens is manufactured using the alignment device according to the first embodiment. As a result, the following inconvenience was found.

That is, the eccentricity of the cemented lens was measured by the sliding means according to the first embodiment.
In the CCD camera 14 via the 0 × objective lens 13,
The focus locus of the cross chart image goes out of the detection range,
It has been impossible to calculate the optical axis of the cemented lens.

The detecting means according to the present embodiment is provided to solve such inconvenience, and includes objective lenses 31a, 31b and 31c having different magnifications, and the objective lenses are fixed. The turntable 32 is provided with a member that can be freely rotated by control means. After the second lens body 2 whose optical axis is shifted from the position of the center of gravity is brought into contact with the first lens body 1, the second lens body 2 shifts to an inclined state which is a stable position when measuring the amount of eccentricity, for example.

In this case, an attempt was made to view the focal locus of the cross chart through the initially set 20 × objective lens 31b. However, since it was found that the locus was outside the detection range of the CCD camera 16, the turntable was 10 ×. Objective lens 31
Changed to c and checked the cross trajectory focus trajectory,
The optical axis of the cemented lens can be calculated within the range of the CCD camera. When bonding was performed in this state, it was confirmed that the bonding was performed with alignment accuracy within 45 seconds.

[0065]

As described above, according to the apparatus for aligning a cemented lens according to the present invention, the position of the center of gravity and the optical axis of the second lens body to be aligned are shifted from those of a centerless lens. The present invention is also applicable to a lens body, and has an effect that high-precision alignment can be easily performed despite a simple and inexpensive configuration and a reduction in lens processing cost.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view and a top view of a cemented lens showing an alignment state according to the first embodiment of the present invention.

FIG. 3 is a flowchart schematically showing steps up to completion of a cemented lens according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a pressing force applied to a second lens body and a thickness of an adhesive surface according to a second embodiment of the present invention.

FIG. 5 is a correlation diagram showing the relationship between the pressing force and the thickness of the bonding surface according to the second embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a regulated position of a holding member and an inclined state of a second lens body according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view showing an overall configuration of a centering device in which a plurality of objective lenses are arranged according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view and a top view of a cemented lens showing an alignment state in a conventional form.

FIG. 9 is a cross-sectional view showing the overall configuration of a conventional alignment device for a cemented lens.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st lens body 2 2nd lens body 8 Rotating roller 10 V-shaped regulating plate for fixing (position regulating means) 13 Holding member 14 Leaf spring member (elastic member) 18 2nd XYZ axis stage (sliding means) 17 PC (Control means) 21 Servo motor 23 Adhesive curing liquid application device 24 First XYZ axis stage (Adhesion curing liquid application device position regulating means) 25 Center of gravity position of second lens body 26 Optical axis of second lens body

Claims (6)

[Claims] 1. A centering device 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 circumferential direction of the lens surface. Rotation generating 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.
When the second lens body placed on the lens body is slid, a holding member for holding the second lens body at a constant pressure, and the second lens body via the holding member to move the second lens body to the second lens body. 1
A pressing member that presses against the lens body, a sliding unit that slides the second lens body via the pressing member and the holding member, and a drop applying unit that drops an appropriate amount of adhesive liquid on the first lens surface A light source that emits light that is collimated and transmitted through the first lens body and the second lens body, and a deviation of an optical axis from a focal image of the light transmitted through the first lens body and the second lens body. And a lens surface of the second lens body until the optical axes of the first lens body and the second lens body coincide with each other via a sliding means.
Control means for sliding the lens along the lens surface of the lens body. 2. An adhesive curing liquid applied between the cemented lens surface of the first lens body and the cemented lens surface of the second lens body, the amount of application being adjusted according to the lens surface shape, and The alignment apparatus for a cemented lens according to claim 1, wherein the sliding of the second lens body placed on the lens is maintained at a constant force. 3. An adhesive curing liquid applied between the cemented lens surface of the first lens body and the cemented lens surface of the second lens body, wherein the viscosity of the curing liquid is changed according to the shape of the cemented lens surface. 3. The alignment apparatus for a cemented lens according to claim 1, wherein the second lens body mounted on the first lens body keeps sliding at a constant force. 4. 4. An adhesive curing liquid applied between the cemented lens surface of the first lens body and the cemented lens surface of the second lens body, the adhesive curing liquid being applied on the first lens body so that the thickness of the adhesive curing liquid can be adjusted. 4. The lens centering device according to claim 1, wherein the mounted second lens body is kept at a constant sliding force. 5. The optical system according to claim 1, wherein when the optical axis is detected, the regulating position of the holding member for holding the second lens body is separated from the second lens body by an arbitrary height using sliding means via an elastic member. The lens alignment device according to claim 1, wherein: 6. The lens centering device according to claim 1, wherein an optical magnification of said optical axis detecting means can be arbitrarily changed.