JPH11183708A - Lens bonding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens bonding device capable of rotating a lower lens by supporting it without inclination. SOLUTION: This lens bonding device for bonding a 1st lens 3 with a 2nd lens 2 is equipped with plural rotating bodies 4 for supporting and rotating the 1st lens 3 in contact with the outer peripheral surface of the 1st lens 3 and arranged to be inclined to the optical axis of the 1st lens 3, driving mechanisms 7 and 8 for driving and rotating at least one of plural rotating bodies 4, a positioning mechanism 71a for positioning the 2nd lens 2 with respect to the 1st lens 3, and bonding devices 32 and 33 for bonding the 1st and the 2nd lenses 3 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cementing apparatus suitable for use in manufacturing a compound lens comprising a plurality of lenses.

[0002]

2. Description of the Related Art As an apparatus for joining a plurality of lenses,
For example, an apparatus disclosed in Japanese Patent Application Laid-Open No. 7-1602 is known. FIG. 14 is a diagram showing the configuration of this conventional lens joining apparatus.

[0003] In FIG. 14, a lens joining device is a first lens joining device.
A chuck mechanism for supporting the lens a13,
A lens position adjusting mechanism for positioning the first lens a11, a lens pressing mechanism for pressing the second lens a11 onto the first lens a13, and a first light source for transmitting light from the light source to the first lens a13.
And a monitor device that captures the focal image through the second two lenses, and the chuck mechanism includes a diaphragm chuck that supports the first lens a13, and the first and second lenses are moved around the center line thereof. And a rotation mechanism for rotating the rotation.

[0004]

However, in the above-mentioned conventional apparatus, in order to hold the lens by the chuck mechanism and rotate the first lens accurately around its center line, the rotation center of the rotating device and the chuck are required. It is not only necessary to exactly match the center position when the lens is gripped by the mechanism, but also, as shown in FIGS. 15 and 16, the attitude of the gripped lens, that is, the rotation surface of the chuck mechanism and the rotation surface of the lens are changed. Must match exactly.

In FIGS. 15 and 16, it is assumed that the optical axis a200 of the laser beam emitted from the light source and the rotation surface of the chuck mechanism are exactly perpendicular to each other. When the lens is slightly tilted to the left as shown in FIG. 15 when the lens is gripped, the laser beam is refracted by the lens. The optical path of a201 and the original optical path a20
It is shifted from 0 by a203. When the chuck mechanism is rotated by 180 degrees from this state, the state shown in FIG. 16 is obtained. At this time, the lens is slightly inclined to the right, so that the optical path becomes a202 and similarly shifts by a204.

[0006] That is, even if the optical axis is accurately adjusted and the lens is joined, if the rotation surface of the chuck mechanism and the rotation surface of the lens do not match, it is determined that the accuracy is poor.

In FIGS. 15 and 16, when a thick lens is chucked, the inclination of the lens is regulated by the thickness of the outer peripheral surface of the lens in the optical axis direction by the outer peripheral chuck. Although it is shown to be restricted, if two positions of one lens are restricted at the same time, the posture of the lens becomes unstable.

In order to improve the position reproducibility of the chuck mechanism, it is necessary to increase the gripping force. However, increasing the gripping force causes deformation of the lens.

Further, in the conventional example, not only the lens but also the lens position adjusting device and the lens pressing device are rotated, so that the whole device becomes very complicated and the adjustment of the optical axis and the posture of the device become complicated.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lens joining apparatus which can support and rotate a lower lens without tilting.

[0011]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a lens joining device according to the present invention is a lens joining device for joining a first lens and a second lens, wherein the lens joining device contacts an outer peripheral surface of the first lens, and A plurality of rotating bodies for supporting and rotating the first lens, wherein the plurality of rotating bodies are arranged with an inclination with respect to an optical axis of the first lens; Driving means for rotationally driving at least one of them; positioning means for positioning the second lens with respect to the first lens; and the first lens and the second lens. And a joining means for joining.

Further, in the lens cementing apparatus according to the present invention, each of the plurality of rotators includes a first rotator contacting an outer peripheral surface of the first lens, and an outer peripheral portion of the first lens. And a second rotating portion supported from below.

Further, in the lens bonding apparatus according to the present invention, the first rotating portion and the second rotating portion are configured to be independently rotatable.

Further, in the lens bonding apparatus according to the present invention, the driving means may rotate only the first rotating part of the first rotating part and the second rotating part of the rotating body. Features.

Further, in the lens bonding apparatus according to the present invention, the driving means includes a motor, a first pulley fixed to a rotating shaft of the motor, a second pulley fixed to the rotating body, It is characterized by comprising a timing belt stretched over the first pulley and the second pulley.

Also, in the lens bonding apparatus according to the present invention, diamond powder is electrodeposited on an outer peripheral surface of a rotating body driven to rotate by the driving means.

Further, in the lens cementing apparatus according to the present invention, a moving means for moving the plurality of rotating bodies to a position in contact with the first lens and a position away from the first lens is further provided. It is characterized by having.

Further, in the lens bonding apparatus according to the present invention, the positioning means includes a plurality of pushing members for pushing the outer peripheral surface of the second lens from a plurality of directions.

Further, in the lens bonding apparatus according to the present invention, at least one of the plurality of pressing members is supported by a spring so as to follow a pressing operation of another pressing member. .

Further, in the lens bonding apparatus according to the present invention, the positioning means includes a plurality of pressing members,
It is characterized by further comprising moving means for moving to a position in contact with the second lens and a position away from the second lens.

Further, the lens bonding apparatus according to the present invention is characterized in that the apparatus further comprises a laser light source for irradiating the first and second lenses with laser light.

Further, the lens bonding apparatus according to the present invention is characterized in that the apparatus further comprises a television camera for receiving light emitted from the laser light source and transmitted through the first and second lenses.

Further, in the lens joining apparatus according to the present invention, based on an image signal from the television camera,
The image processing apparatus further includes an image processing unit for detecting a shift between the center axes of the first lens and the second lens.

Further, in the lens bonding apparatus according to the present invention, an ultraviolet curing adhesive is supplied between the surface of the first lens and the surface of the second lens, and the bonding means includes It is characterized by irradiating an ultraviolet-curable adhesive with ultraviolet light.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, before describing the entire lens joining apparatus, a lens rotation driving unit, which is a main part of the lens joining apparatus of the present embodiment, will be described with reference to FIGS.

FIG. 3 is a diagram showing a lens rotation drive unit for rotating the lens. In the present embodiment, the lens having substantially the same structure is pressed against the outer peripheral surface of the lens from three directions to rotate the lens.

In FIG. 3, reference numeral 4 denotes a rotating pin, and the outer periphery of only this pin is electrodeposited with diamond powder in order to prevent slippage with the outer periphery of the lens. Reference numeral 5 denotes a lens receiving portion which receives a curved portion on the lower surface of the lower lens 3 at this portion. Reference numeral 6 denotes a support portion, and reference numeral 8 denotes a timing belt for rotating the rotary pin 4, which is driven by a motor 7 (see FIG. 1). Reference numeral 50 denotes a bearing in which a shaft 57 is press-fitted into the inner diameter portion, and a lens receiving portion 5 is attached to the outer diameter portion, so that the lens receiving portion 5 can rotate independently of the rotating pin 4. 51,5
Reference numeral 2 denotes a bearing which is positioned on the support portion 6 so that a shaft 57 attached to the rotating pin 4 can rotate. 53 and 58 are spacers, and 54 and 55 are flanges for preventing the timing belt 8 from coming off. 56 is a fixing nut.

FIG. 4 is a view showing a lens rotating unit having no driving unit. The lens rotation unit without this drive unit is
Except that the shaft 57 is not driven by the timing belt 8 and that diamond powder is not electrodeposited on the outer periphery of the rotating pin 41, the lens rotating unit having the driving unit shown in FIG. Similarly, 38 is a support, 41
Is a rotating pin, 42 is a lens receiving portion, 59 is a washer, 6
0 is the axis.

Next, the operation of the lens rotating unit will be described.

FIG. 5 shows a lens 1 (an ultraviolet-curing adhesive is applied to the upper surface of the lower lens 3 and the upper lens 2 is mounted on the upper surface of the lower lens 3). Is a plan view showing a state in which the gaps are uniformly filled.) And FIG. 6 is a side view thereof.

In FIG. 5 and FIG.
The lens receiving portions 5 and 42 are attached to the optical axis of the lower lens 3 by being inclined by Φ in the rotation direction of the lens.
In the apparatus of the present embodiment, Φ is set to approximately 0.2 ° to 0.3 °. The rotating pin 4 having the driving unit is indicated by an arrow k1.
, The lens 1 rotates in the direction of arrow k2. The rotation force F1 of the rotation pin 4 is the force F in the lens rotation direction.
2 and a force F3 for pushing the lens 1 downward.
Therefore, when the rotating pin 4 is rotated in the direction of arrow k1, the lens 1 rotates in the direction of arrow k2 and also moves downward. Further, since the rotating pin 4 is attached at an angle, only the point contact portion 100 is in contact with the outer peripheral portion of the lens, and the posture of the lens is determined by three points on the upper surfaces of the lens receiving portions 5 and 42 and is stabilized. If the rotating pin 4 is the lower lens 3
Is parallel to the optical axis, the outer peripheral surface 101 of the lens and the outer peripheral portion of the rotating pin 4 come into line contact, and the posture of the lens is regulated not only by the lens receiving portions 5 and 42 but also by the outer periphery of the rotating pin 4. As a result, the posture of the lens becomes unstable.

Next, the operation of the rotary pin 41 having no drive unit will be described with reference to FIGS. FIG. 7 shows a lens 1 (an ultraviolet curable adhesive is applied to the upper surface of the lower lens 3 and the upper lens 2 is mounted thereon), and the lower lens 3 and the upper lens 2 are brought into close contact with each other so that the ultraviolet curable adhesive is uniform. Is a plan view showing a state in which a gap is filled.) And FIG. 8 is a side view thereof.

7 and 8, since the lens 1 is rotated in the direction of arrow k2 by the rotation pin 4, the rotation pin 4
1 rotates in the direction of arrow k3. The force F4 due to the rotation of the lens 1 is divided into a force F5 for rotating the rotation pin 41 and a force F6 for pushing upward. However, since the movement of the rotation pin 41 in the axial direction is restricted, a force to push the lens 1 downward acts on the contrary. That is, the rotation pins 4 and 41 and the lens receiving portions 5 and 42 are attached by being inclined by Φ with respect to the optical axis of the lower lens 3 in the rotation direction of the lens, and by driving at least one rotation pin, the lens 1 Directional and downward forces can be generated. If the lower lens 3 is not in contact with the lens receiving portion 5, the lower lens 3 can be reliably brought into contact with the lens receiving portion 5 by rotating the rotating pin 4.
Thereafter, when the rotation pin 4 is rotated, the lower lens 3 is always rotated.
Can be surely brought into contact with the lens receiving portion 5 to be rotated.

Next, the steps of joining lenses using the lens joining apparatus of this embodiment will be described with reference to the flowcharts of FIGS. 1, 2 and 11.

FIGS. 1 and 2 are views showing the configuration of the lens joining apparatus of the present embodiment.

In FIGS. 1 and 2, the rotating devices 70 and 70a for supporting and rotating the outer periphery of the lower lens have been previously moved to positions where the outer periphery of the lower lens can be supported.
Here, the rotating device 70a includes the lens rotating unit having the driving unit illustrated in FIG. 3, and the rotating device 70 includes the lens rotating unit without the driving unit illustrated in FIG.

The lens position adjusting devices 71 and 71a are
The lifting device 22 is driven by the motor 25 to complete the movement so that the tip pins 14 and 60 of the adjustment device are at the same height as the outer peripheral portion of the upper lens 2, and the tip pins 14 and 60 are attached so that the lens 1 can be easily mounted. , 60 are waiting at a position sufficiently widened from the lens outer diameter. The measurement optical system 80 is also waiting at the measurement position.

FIG. 9 shows the configuration of the rotating device 70 having no driving section, and FIG. 1 shows the configuration of the lens position adjusting device 71.
0 is shown.

The lens 1 to be joined in this state (an ultraviolet curing adhesive is applied to the upper surface of the lower lens 3 and the upper lens 2 is mounted thereon, and the lower lens 3 and the upper lens 2 are brought into close contact with each other so that the ultraviolet curing adhesive Are used to uniformly fill the gaps. In this state, the ultraviolet curable adhesive is not cured.)
Is mounted at the center of the rotating device such that the lower surface of the lower lens 3 contacts the lens receivers 5 and 42. At the time of mounting, air is supplied to the air cylinder 72 attached to the rotating device 70a, the lens rotation drive unit is retracted to the motor 1 side, and after the lens 1 is mounted, the air of the air cylinder 72 is discharged to remove the lens. The rotation drive unit is advanced to clamp the lower lens 3 (Step S2).

The lower lens 3 is rotated by a spring 12
Is pressed against the rotating pin 41 side. As the spring 12 for pressing the lower lens 3 so that the lower lens 3 does not move during the lens position adjustment, a spring that can obtain a larger spring force than the spring 16 of the lens adjustment device 71a is selected.

When the lens 1 is mounted, the motor 7 of the lens rotation driving unit is rotated, the rotation pin 4 is rotated via the timing belt 8, and the lens 1 is rotated two or three times (step S4). By doing so, as described above, even if the lower surface of the lower lens 3 is not in contact with the lens receivers 5 and 42 when the lens is mounted, the lower surface of the lens 3 can be surely brought into contact with the lens receivers 5 and 42. it can. When the rotation is completed, the motor 11 is driven to move the operating parts 17 and 39 of the lens position adjusting devices 71 and 71a to the opposite side to the motor 11, and the upper lens 2 is moved to a predetermined position by the tip pins 14 and 60. (Step S6), and after positioning the upper lens 2, the motor 11 is driven again, and the tip pins 14, 60 are moved to the motor 11 side until they do not touch the upper lens 2 (about 1 mm away). Move and stop (step S
8). Thereby, the upper lens 2 can be surely put in the field of view of the optical system.

Next, the lens 1 is rotated by a constant angle, and a circle approximation is calculated by the least squares method based on the locus drawn by the focal image to obtain the rotation center (steps S10 to S).
14). More specifically, a laser beam emitted from a laser light source 26 passes through a beam expander 27, becomes collimated by a collimator lens 28, passes through a filter 29, and enters two lenses 2 and 3, and a focal image is formed by an objective lens. Is imaged by the television camera 30 via the lens barrel 31 having

In this state, since the optical axes of the two lenses 1 and 3 are not normally aligned as shown in FIG.
(On the imaging surface of the camera, there is a shift of distance X, て い る = X / L). Here, when the motor 7 of the rotation device 70a is rotated to drive the timing belt 8 and the rotation pin 4 is rotated to rotate the lens 1, the focal image forms a circle around the optical axis with a radius X. .

FIG. 13 shows a binarized image of the focal image on the monitor 35. One rotation is almost equally divided and rotated by a certain angle. In this embodiment, it is divided into eight equal parts and rotated by 45 °. Initially, it is assumed that the position of the focal image is S1. The lens 1 is rotated by 45 °, and the center of gravity of the binarized image at that time is obtained by the image processing device 34. Diamond powder is electrodeposited on the outer peripheral portion of the rotating pin 4 in order to prevent the outer peripheral portion of the lens 1 from slipping.

The coordinates of the position of the center of gravity are S1 (x1, y
1), S2 (x2, y2),..., S8 (x8, y8). This allows the personal computer 36
Performs a circle approximation calculation by the least squares method. Assuming that the radius of the circle to be obtained is r0 and the center coordinates are (x0, y0), the following equation is obtained: (x-x0) ^ 2 + (y-y0) ^ 2 = r0 ^ 2 (1) Here, (x, y) are the coordinates of S1, S2,..., S8 described above. Also, a ^
b represents a raised to the power of b.

Here, the equation (1) is transformed into x ^ 2-2xx0 + x0 ^ 2 + y ^ 2-2yy0 + y0 ^ 2 = r0 ^ 2, and further, x ^ 2 + y ^ 2 = 2xx0 + 2yy0 + (r0 ^ 2-x0 ^ 2-y0 ^) 2) It is expressed as (2).

Here, x0 = A, 2x = X, y0 = B, 2y
= Y, r0 ^ 2-x0 ^ 2-y0 ^ 2 = C, x ^ 2 + y ^ 2 = Z, the equation (2) can be expressed as a linear function as Z = X ＝ A + Y ・ B + C (3) . For this equation (3), the coordinates (x1, y) obtained above are added to (x, y).
1), (x2, y2),..., (X8, y8) are sequentially substituted, and A, B, and C are obtained by the least squares method. In this way, unknowns x0, y0, and r0 are calculated from A, B, and C obtained by the least squares method, respectively. The coordinates of the obtained center position SS are (x0, y0). This position is the adjustment target position of the upper lens 2.

Next, the motor 11 is driven to move the movable parts 17 and 39 of the lens position adjusting devices 71 and 71a to the motor 11
And the upper lens 2 is clamped again by the tip pins 14 and 60 (step S16). In this state, the coordinates of the position of the center of gravity of the binarized image of the focal image when clamped by the image processing device 34 are measured. Assuming that the coordinates are (xa, ya), the movement amount to the target position is x0-xa in the X direction and y0-ya in the Y direction (step S20).

The motor 11 of the lens position adjusting device 71 is rotated, and the upper lens 2 is moved by the above-mentioned amount of movement by the tip pin 60 to move the position of the focal image to the target position (x0, y0) (step S22). Lens position adjusting device 71a
Of the upper lens 2 is pressed by a spring 16. The coordinates of the position of the center of gravity of the binarized image of the focal image are measured by the image processing device 34 again. If the measured coordinates are within the standard with respect to the target position, the adjustment ends. If it is out of the standard, the upper lens 2 is similarly moved again until the standard is satisfied (steps S18 to S22).

Since the upper lens 2 is sufficiently adhered to the lower lens 3 due to the viscosity of the ultraviolet curing adhesive, the upper lens 2 does not rise when pressed from the lateral direction, and the upper lens 2 is in contact with the lower lens 3. The upper lens 2 may be pushed from the lateral direction by the tip pins 14 and 60 because the R end face of the upper lens 2 may be lacked when the upper lens 2 moves along the upper side and is pressed obliquely from above. .

When the adjustment is completed, the reflecting mirror 33 and the ultraviolet irradiation fiber 32 move on the optical axis, and the upper lens 2 is clamped to the ultraviolet curing adhesive between the upper lens 2 and the lower lens 3. Ultraviolet rays are applied to cure (Step S24). When the curing is completed, unclamping is performed (step S26), and the tip pin 1 of the lens position adjusting device
4, 60 are retracted to the motor 11 side.

When the retraction is completed, the motor 7 of the rotating device 70a is rotated to drive the timing belt 8, and the rotating pin 4
Is rotated to rotate the lens 1, and a circle approximation calculation is similarly performed by the circle approximation method using the least squares method. If the calculated radius is within the standard, it is a non-defective product (step S28).
-Step S32).

Next, air is supplied to the air cylinder 72 attached to the rotating device 70a, the lens rotation drive unit is moved backward to the motor 11, and the bonded lens 1 is removed (step S34). This completes the lens joining,
Good products and defective products are selected based on the magnitude of the deviation of the center position calculated in step S32 (steps S36 to S40).

[0055]

As described above, according to the present invention,
The lens can be prevented from floating during rotation, and a stable posture can be maintained, so that measurement and adjustment can be performed with high accuracy.

Further, since the rotating pin and the lens receiving portion are separated, wear and damage of the lens due to a difference in rotational speed between the outer peripheral portion of the lens and the lower end R of the lens contacting the lens receiving portion can be prevented.

Further, among the rotating pins for rotating the first lens, diamond powder is electrodeposited on the outer peripheral portion of at least one rotating pin in contact with the lens, whereby slip can be prevented, and the lens can be surely rotated. it can.

[0058]

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a lens joining device according to the present invention.

FIG. 2 is a diagram showing a positional relationship between a lens rotation device and a lens position adjustment device of the lens joining device.

FIG. 3 is a diagram showing a lens rotation drive unit for rotating a lens.

FIG. 4 is a diagram illustrating an example of a lens rotating unit having no driving unit.

FIG. 5 is a diagram for explaining an operation of the lens when the rotation pin is attached to be inclined with respect to the optical axis.

FIG. 6 is a diagram for explaining an operation of the lens when the rotation pin is attached to be inclined with respect to the optical axis.

FIG. 7 is a diagram for explaining an operation of the lens when the rotation pin is attached to be inclined with respect to the optical axis.

FIG. 8 is a diagram for explaining an operation of the lens when the rotation pin is attached to be inclined with respect to the optical axis.

FIG. 9 is a diagram illustrating an example of a rotation device having no lens rotation drive unit.

FIG. 10 is a diagram illustrating an example of a lens position adjustment device having a rigid adjustment pin.

FIG. 11 is a flowchart illustrating an operation of lens joining.

FIG. 12 is a diagram showing a deviation of an optical axis between two lenses.

FIG. 13 is a diagram for explaining a circle approximation calculation by the least squares method for obtaining a center position and a radius of the optical axis shift.

FIG. 14 is a diagram showing a conventional example.

FIG. 15 is a diagram for explaining a problem due to a conventional lens clamp.

FIG. 16 is a diagram for explaining a problem due to a conventional lens clamp.

[Explanation of symbols]

 9 Slide part 10 Stage 15 Spring stop 18 Retainer 19 Slide pin 38 Lens rotating device movable part 40 Adjustment pin

Claims (14)

[Claims] 1. A lens joining apparatus for joining a first lens and a second lens, wherein the first lens contacts an outer peripheral surface of the first lens and rotates while supporting the first lens. A plurality of rotating bodies of
A plurality of rotators arranged at an angle to the optical axis of the first lens; a driving unit for rotating at least one of the plurality of rotators; and the first lens A lens bonding apparatus comprising: positioning means for positioning the second lens with respect to the first lens; and bonding means for bonding the first lens and the second lens. 2. Each of the plurality of rotators includes a first rotator that contacts an outer peripheral surface of the first lens, and a second rotator that supports the outer peripheral portion of the first lens from below. The lens joining device according to claim 1, comprising: 3. The lens joining apparatus according to claim 2, wherein the first rotating unit and the second rotating unit are configured to be independently rotatable. 4. The apparatus according to claim 3, wherein the driving unit rotationally drives only the first rotating part of the first rotating part and the second rotating part of the rotating body. Lens joining device. 5. The driving unit includes: a motor, a first pulley fixed to a rotating shaft of the motor, a second pulley fixed to the rotating body, the first pulley and the second pulley. The lens joining device according to claim 1, further comprising a timing belt wound around the pulley. 6. The lens joining apparatus according to claim 1, wherein diamond powder is electrodeposited on an outer peripheral surface of a rotating body driven to rotate by said driving means. 7. The apparatus according to claim 1, further comprising a moving unit configured to move the plurality of rotating bodies to a position in contact with the first lens and a position away from the first lens. 2. The lens joining device according to 1. 8. The lens bonding apparatus according to claim 1, wherein the positioning unit includes a plurality of pushing members for pushing an outer peripheral surface of the second lens from a plurality of directions. 9. The lens joining apparatus according to claim 8, wherein at least one of the plurality of pressing members is supported by a spring so as to follow a pressing operation of another pressing member. . 10. The positioning device further comprises a moving device for moving the plurality of pressing members to a position in contact with the second lens and a position away from the second lens. The lens joining device according to claim 8, wherein 11. The lens joining apparatus according to claim 1, further comprising a laser light source for irradiating the first and second lenses with laser light. 12. The lens joining apparatus according to claim 11, further comprising a television camera for receiving light emitted from the laser light source and transmitted through the first and second lenses. 13. The image processing apparatus according to claim 12, further comprising: an image processing unit configured to detect a shift of a central axis between the first lens and the second lens based on an image signal from the television camera. Item 13. The lens joining device according to Item 12. 14. An ultraviolet-curable adhesive is supplied between the surface of the first lens and the surface of the second lens, and the bonding unit irradiates the ultraviolet-curable adhesive with ultraviolet light. The lens joining device according to claim 1, wherein: