JP3052387B2 - Lens joining device - Google Patents

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 for automatically and accurately adjusting the alignment of an optical axis at the time of joining lenses in a cemented lens.

[0002]

2. Description of the Related Art Conventionally, in a cemented lens using an ultraviolet-curable adhesive, the optical axis of each single lens before joining depends on processing accuracy, and a method of joining with reference to an edge surface of an outer periphery after centering is used. In addition, a method has been adopted in which the amount of eccentricity of the optical axis is measured at a stage before the adhesive is cured, and the alignment is manually performed. Further, in recent years, the bonding jig shown in FIG. 4 has been adopted as a joining jig requiring higher alignment accuracy in a short time.

A conventional lens joining apparatus will be described below with reference to the drawings. FIG. 4 shows an example of a conventional lens joining apparatus, wherein 1 is a light source body of an eccentric microscope, 2 is a light source lamp,
Reference numeral 3 denotes a collimator lens provided with a cross chart to collimate the light emitted from the light source lamp 2, 4a a bell for mounting the lens, 5 an objective lens of an eccentric microscope for capturing a cross image, and 6 a later-described lens. V-shaped claw for positioning and rotating the lens 20 to be inspected, 7 is a drive unit for moving the V-shaped claw 6, and 8 is a V-shaped claw 6 with the lens 20 interposed therebetween.
A rotating roller 9 is provided at a position facing the lens, 9 is an O-ring that contacts the outer periphery of the lens 20 to be tested and transmits the rotation of the rotating roller 8, 10 is a rotation drive unit of the rotating roller 8, and 11 is a lens 21 to be described later. And a driving unit for moving the flat-type setting claw 11;
Reference numeral 3 denotes a position opposite to the flat-type setting claw 11 with the lens 21 to be measured interposed therebetween, and the test lens 21 is attached to the flat-type setting claw 1.
Reference numeral 1 denotes a push plate, 14 denotes a drive unit for moving the push plate 13, 16 denotes a feed screw, 17 denotes a reflection mirror, 20 denotes a first test lens, and 21 denotes a second test lens.

[0004] The operation of the above-structured lens joining apparatus will be described below. After the test lens 21 is bonded to the test lens 20 and before the adhesive is cured, the test lens 21 is mounted on the bell 4 a of the eccentric microscope, and the V-shaped regulating claw 6 is attached to the outer peripheral surface (edge surface) of the first test lens 20. And the rotating roller 8 are brought into contact from the opposite direction. Next, the rotation roller 8 is driven by the rotation drive unit 10 to rotate the first test lens 20 by 180 degrees, and the amount of eccentricity Δx ₁ is measured by the eccentric microscope. When the measurement of Δx ₁ is completed, the rotating roller 8 is rotated again to set the eccentricity Δx
_The phase having the maximum value of ₁ is adjusted to the position of the flat-type regulating claw 11.

[0005] Next, the flat-type setting claw 11 that has been driven and moved by the drive unit 12 via the feed screw 16 flattens the outer periphery of the second lens 21 to be tested by the pressing plate 13 pressing from the opposing position. The shape-setting claw 11 is held as a reference. Assuming that the amount of displacement of the test lens 21 caused by this operation is Δx ₂ , the amount of eccentricity from the optical axis is (Δx ₁ +
Δx ₂ ). Δx ₂ is known by previously checking with a master lens. Since Δx ₁ is known by measurement, the correction amount (Δx ₁ + Δx ₂ ) is obtained, so that the centering can be performed. By using such a method, centering can be performed regardless of the processing accuracy of the outer periphery.

[0006]

However, in the above-described structure, after the second lens 21 is clamped, the driving unit 12 drives the flat claw 11 via the feed screw 16.
Is moved forward and the second lens 21 is moved leftward in FIG. 4 to perform centering. If an overload is applied to the second lens 21, chipping may occur. The push plate 13 needs to be retracted, and the test lens 21
Direction and amount of movement are unstable.

Further, when the curvature of the bonding surface of the lens is small, or when the condition of the adhesive of the ultra-thin bonding layer changes, the eccentricity does not converge even when the alignment operation is repeatedly performed, and the reliability of the device does not increase. Lack.

[0008] Further, in order to perform the automation, it is impossible to realize unless the process relying on visual observation is excluded.
Unless the first alignment process is simplified, it is not suitable for mass production.

On the other hand, in terms of quality, the lens 4 to be inspected is damaged by the bell 4a, so that it is only possible to support the lens 20 outside the effective diameter. The problem cannot be avoided.

Further, when the bell 4a and the lens 20 are not in close contact with each other when the eccentricity Δx ₁ is measured by rotating the lens 20 to be measured, a measurement error increases, and it becomes difficult to perform highly accurate alignment. There were various problems such as becoming.

The present invention has been made in view of the above-mentioned problems, and it is possible to perform alignment only by moving a lens to be inspected only once to improve mass productivity and reliability of the apparatus. Investigate the material of the bell to prevent scratches on the sliding part of the lens to be inspected, improve the quality, and use a bell that can be adsorbed so that the eccentricity can be measured stably and with high accuracy. It is an object of the present invention to provide a lens joining device that solves various problems.

[0012]

In order to achieve the above object, a lens joining apparatus according to the present invention comprises a fixed bell for supporting a first lens to be inspected and an edge of the first lens to be inspected. A first setting claw that is movable to be in contact with, a movable rotating roller that has an elastic body on the outer periphery, and is provided to press the first lens on the first setting claw; XY table part for arbitrarily positioning on a simple plane and its X
The second and third setting claws for grasping the edge surface of the second lens to be inspected at the tip of the Y table portion, and an eccentric microscope and a recognition processing device for transmitting light through the bell and enabling eccentricity measurement It is provided with.

Further, a diamond coating of fine particles is applied to each part which is in sliding contact with the lens to be inspected, and the adhered lens is adsorbed with a transparent flat glass so as not to hinder the passage of light so as to block the light path and to be airtight. The first lens to be inspected is supported by the enabled bell.

[0014]

According to the present invention, the first configuration automatically recognizes the center coordinates of the optical axes of the first lens and the second lens before the adhesive is hardened after the lens bonding, and the first lens is bonded. The eccentric coordinates of the optical axis when the second lens to be inspected is grasped while holding the inspection lens are recognized again as a vector, and the second lens to be inspected is moved by the XY table to set the eccentricity of the optical axis to zero, that is, forcibly. By performing the optical correction, the alignment of the optical axis can be automatically realized in a short time without repeating the alignment operation.

Further, it is desirable to prevent scratches and dents remaining on the surface of the first lens supported by the bell when searching for the initial optical axis center coordinates by diamond coating the sliding contact portion of the bell. Can be.

Further, by adhering a transparent flat glass so as to block the optical path inside the bell and to be airtight, airtightness of the internal pressure can be maintained without obstructing the passage of light from the light source. High precision eccentricity measurement is possible by supporting the test lens while adsorbing it.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lens joining apparatus according to an embodiment of the present invention.

FIG. 1 is a longitudinal sectional view of a lens joining apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In FIG. 1, reference numeral 1 denotes a light source body of an eccentric microscope having a structure similar to that of a conventional example. Reference numeral 4 denotes a bell, and a vacuum source 19 is connected to the pipe 15, and a transparent flat glass 18 is adhered to the inside of the bell 4 so as to block an optical path and be airtight.
When the first test lens 20 is placed, vacuum suction becomes possible. Reference numeral 5 denotes an objective lens of an eccentric microscope. This pair is fixed to a movable table 24 for focusing, and a television camera 25 is connected thereto. A recognition processing device 26 and a monitor 27 are electrically connected to the television camera 25 to receive a cross image from the light source body 1 and observe and store the coordinates of the center point with high accuracy.

In the apparatus having the above-described configuration, the first lens 20 to be inspected is gripped by the V-shaped setting claw 6 and the O-ring 9, but the V-shaped setting claw 6 can be moved by the movable guide 28 and the cylinder 7. The O-ring 9 is attached to the outer periphery of the rotating roller 8, and the rotating roller 8 is supported by a bearing 33 and is rotated by the motor 10 via gears 31 and 32. Further, the rotating roller 8 to which the O-ring 9 is attached is movable by a movable guide 29 and a cylinder 30 in which a bearing 33 is attached to a block 41 and fixed to the unit main body 23.

On the other hand, the second test lens 21 is gripped by the V-shaped setting claw 38 and the flat-shaped setting claw 13. The V-shaped setting claw 38 is attached to a plate 39 fixed to a Y-axis table main body 37 movable in a direction perpendicular to the optical axis direction. Further, the flat-type regulating claw 13 is also used for the second lens 2 to be inspected.
The movable guide 40 and the cylinder 1 are brought into contact with the edge surface of the cylinder 1.
4 together with the plate 39.

Next, the XY table will be described. FIG.
As shown in the figure, the X-axis table main body 34 is movable by connecting the X-axis motor 36 and the bracket via a joint 35, and the Y-axis table main body 37
2 are connected via a joint 35 and a bracket 42,
The Y-axis table fixed part is attached to the movable part of the X-axis table. The X-axis table is provided on the unit main body 23, and the unit main body 23 and the eccentric microscope are both fixed to the entire base 22. In terms of electrical control, the recognition processing device 26 can control the X-axis motor 36, the Y-axis motor 12, the rotation moving unit 10, and each cylinder.

As shown in FIG. 3, a portion A indicated by a dashed line slidingly contacting the lens, such as the bell 4, the V-shaped regulating claws 6 and 38, and the flat-shaped regulating claw 13, has a particle size of about 0.1 to 0.4 μm. Diamond coating treatment.

The operation of the thus-configured lens cementing apparatus will be described below. First lens 2 to be inspected
When the lens 0 and the second test lens 21 are attached to the apparatus before being bonded with an ultraviolet curable adhesive or the like and the adhesive is not cured, first, the vacuum suction of the bell 4 acts, and Holds one test lens 20. Next, cylinder 7 and cylinder 3
0 is activated, and the O-ring 9 wound around the V-shaped regulating claw 6 and the rotating roller 8 sandwiches the edge surface of the test lens 20 from both sides. By making the thrust of the cylinders 7 and 30 larger for the cylinder 7, the axis of the fixed bell 4 and the axis of the V-shaped regulating claw 6 can be matched. Third, since the rotation drive unit 10 operates to transmit the rotational force to the rotating roller 8 and the O-ring 9 via the gears 31 and 32, the frictional force between the O-ring and the lens 20 causes the lenses 20 and 21 to be tested. Rotates. Fourthly, when the cross image formed on the objective lens 5 through the test lenses 20 and 21 rotated in this way is observed by the television camera 25, the cross image draws a locus of a circle having the eccentric amount as a radius. Stores the center coordinates of the circle. Fifth
Next, the edge surface of the second lens to be inspected is clamped between the V-shaped regulating claw 38 and the flat-shaped regulating claw 13. At this time, the V-shaped regulating claw 38
Moves together with the X-axis table, and the flat
Generates a pressing force in the cylinder 14. Sixth, if the recognition process is performed again in this state, the coordinates of the current cross image are measured.
The difference from the already measured initial optical axis center coordinate is obtained as a vector value. Seventh, the XY table performs the above-described vector value correction operation of the absolute values of the direction and the dimension, thereby positioning the optical axis eccentricity to zero while holding the second lens 21 to be inspected, and adjusting the alignment. Completed. Finally, the adhesive is cured to complete the joining process.

As described above, according to the present embodiment, stable and highly accurate alignment can be realized by one operation of the apparatus.

Further, if a diamond coating is applied to a portion which comes into sliding contact with the lens to be inspected, not only the life of the member is extended but also scratches and dents on the lens side can be prevented. Further, if the flat glass 18 is adhered to the bell so as to be able to transmit light, the bell can be adsorbed and the first test lens 20 can be securely held by the bell, and more stable eccentricity measurement can be realized.

[0027]

As is apparent from the above description, according to the present invention, a fixed bell for supporting a first lens to be inspected and a second bell movable so as to contact the edge surface of the first lens to be inspected. A movable rotating roller having an elastic body on the outer periphery of the first setting claw and the first setting claw, and provided to press the first lens to be tested, on a plane perpendicular to the optical axis; XY table part for arbitrarily positioning the XY table part, second and third setting claws for gripping the edge surface of the second lens to be measured at the tip of the XY table part, and eccentricity measurement by transmitting light through the bell By providing an eccentric microscope and a recognition processing device capable of performing the above, the precision, reliability, and high speed of the optical axis alignment and joining of the test lens are improved, and the production can be automated. In addition, by performing diamond coating on the part that comes into sliding contact with the lens to be inspected, the lens to be inspected is not damaged, and a stable and high yield is obtained in terms of quality.Moreover, by giving the bell a suction function, Stability of the lens to be inspected enables highly accurate eccentricity measurement.
Practical equipment that solves the conventional problems can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a lens joining apparatus according to the present invention.

FIG. 2 is a plan view showing an embodiment of the lens joining apparatus of the present invention.

FIG. 3 is a longitudinal sectional view of a peripheral portion of a bell used in an embodiment of the lens joining apparatus of the present invention.

FIG. 4 is a longitudinal sectional front view of a conventional lens joining apparatus.

[Explanation of symbols]

 Reference Signs List 1 light source body (light) 4 bell 5 objective lens (eccentric microscope) 6 V-shaped regulating claw (first regulating claw) 8 rotating roller 9 O-ring (elastic body) 13 flat-shaped regulating claw (third regulating claw) 18 Flat glass 20 First lens to be inspected 21 Second lens to be inspected 26 Recognition processing device 34 X-axis table body (XY table) 37 Y-axis table body (XY table) 38 V-shaped regulating claw (second regulating claw)

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Ueda 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-57-49526 (JP, A) JP-A-63- 256553 (JP, A) JP-A-2-143840 (JP, A) JP-A-3-279239 (JP, A) JP-A-2-48156 (JP, A) JP-A-63-172204 (JP, A) JP-A-54-103416 (JP, A) JP-A-63-2746 (JP, U) JP-A-61-187339 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 3/00 G02B 7/02 B29C 65/48 B29C 65/78 B29L 11:00

Claims (3)

(57) [Claims] 1. A fixed bell for supporting a first lens to be inspected, a movable first setting claw abutting on the edge surface of the first lens to be inspected, and an elastic body on an outer periphery. A movable rotary roller provided so as to press the first test lens in opposition to the first setting claw, an XY table portion capable of arbitrarily positioning on a plane perpendicular to the optical axis, and the XY table A second and a third setting claw that grips the edge surface of the second test lens at the tip of the section, an eccentric microscope that transmits light through the bell and enables eccentricity measurement, and a recognition processing device. A lens joining device comprising: 2. A lens joining apparatus according to claim 1, further comprising a member having a diamond coating of fine particles applied to a portion in sliding contact with the lens. 3. A lens bonding apparatus according to claim 1, further comprising a bell which is formed by adhering a transparent flat glass on an optical path so as not to hinder the passage of light and capable of adsorbing a lens.