JPH0481764B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves placing a convex lens with a slightly smaller diameter on the upper surface of an optical lens, such as a concave lens, and aligning the optical axes of the lenses so that their optical axes coincide. This invention relates to an optical lens centering and bonding device for bonding both together using a balsam adhesive.

[Conventional technology]

Conventionally, a concave lens with a diameter of about 6 to 20 mm and a convex lens with a slightly smaller diameter were joined together so that their optical axes coincided, and the process of assembling them was done manually as follows.

The concave lens that serves as a reference for bonding is finished with a centering machine so that the outer periphery forms a concentric circle with respect to the optical axis and has a constant diameter. Place the lens in a fixed dish-shaped jig so that its center is aligned with the optical axis of the optical microscope, and put a small amount of balsam glue on the top surface of the concave lens, so that the optical axis of the lens is aligned with the optical axis of the microscope. Then, place a convex lens with a slightly smaller diameter on top of the concave lens so that their centers almost coincide, and while observing the focused images of both superimposed lenses with a reflective optical microscope, only the convex lens is removed using tweezers or the like. to bring the focused image to the XY coordinate center position. When the X-Y coordinate center alignment of the focal image is completed, ultraviolet rays are irradiated for about 10 seconds to solidify the balsam adhesive, and both lenses glued together with their optical axes aligned are placed in a dish-shaped jig. It is extracted from

[Problem that the invention seeks to solve]

With this method of centering and gluing optical lenses, it is difficult for anyone who is not an expert to center the optical axis within a predetermined precision, for example, 7 μm, and even if an expert is not skilled, it is difficult to center the optical axis within a predetermined accuracy, for example, within 7 μm. There are disadvantages in that it takes at least 30 seconds to center one set, and that it is difficult to increase productivity due to fatigue caused by looking directly into the reflective optical microscope.

The present invention solves the problems of the conventional methods described above, allows even an unskilled person to center the optical axis with a predetermined accuracy easily and in a short time, and allows the reflective optical system required for centering to be performed easily and quickly. It is an object of the present invention to provide an optical lens centering and bonding device that can reduce eye strain and increase productivity by replacing observation with a microscope with observation on a monitor television image plane.

[Means for solving problems]

In this invention, as a technical means for solving the above-mentioned problems, an optical lens centering and bonding device is constructed with the following elements. In other words, there is a lens holder that holds the lower lens on the upper surface of two optical lenses stacked vertically with a balsam adhesive coating layer interposed therebetween, and a notch that abuts the lower lens held by this lens holder at the tip. a rotatable rubber roll that is disposed opposite to the lens positioning arm while sandwiching the lower part thereof and that is pushed horizontally by a linear drive mechanism to press the lens; and a means for rotating the rubber roll. a lens positioning/rotating device consisting of a lens positioning and rotating device; and an imaging surface is located at a position where the focal optical images of the two optical lenses superimposed vertically are imaged together with a measurement pattern consisting of an X-Y coordinate system provided in the optical system. A focused image observation microscope device comprising: a reflective optical microscope equipped with a television camera so as to coincide; and a monitor television connected to the television camera via an electric circuit to display the focal image and the measurement pattern on a screen at the same time; , an X-Y table driven by a pair of pulse motors, this
It has an elevating mechanism attached to the table and a pressing part that is held by this elevating mechanism and has a through hole formed at its tip and a chamfered lower edge of the through hole, and the upper part pressed by this pressing part. and a lens position correction device having a lens position correction arm for slightly moving the lens to be adhered by moving the X-Y table.

[Effect]

The optical lens centering and bonding device according to the present invention is constructed as described above and operates as follows.

Of the two optical lenses stacked one on top of the other with a balsam adhesive coating layer interposed between them, the lower lens is placed on the top surface of the lens holder. The notches are brought into contact and positioned by pressing with a rubber roll pushed out by a direct drive mechanism.

Next, the focal images of both lenses are projected onto the image plane of a monitor television together with a measurement pattern consisting of an X-Y coordinate system provided in the optical system of the reflective optical microscope, and the eccentricity of the focal images is measured. Next, the lens position correction arm is lowered by its elevating mechanism,
The upper lens to be adhered is pressed by the chamfered portion of the lower surface of the through hole provided at the tip of the arm, and correction pulses in the X-axis direction and the Y-axis direction corresponding to the eccentricity are sent to the arm. The position of the upper lens is corrected by slightly moving it together with the XY table using a pulse motor. Then, the lens position correction arm is raised by the elevating mechanism, and at least the lower optical lens and the upper lens to be adhered are moved by the rotating means of the rubber roll.
Rotate about 180°. At this time, it can be confirmed whether the centering for aligning the optical axes has been performed as specified.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an external plan view showing the configuration of the main parts of an optical lens centering and bonding device according to an embodiment of the present invention, and FIG. 2 is an external side view thereof.

This embodiment device is composed of a lens holding device 2 provided on a base 1, a lens positioning/rotating device 3, a focal image observation microscope device 4, a bonded lens position correcting device 5, and an ultraviolet irradiation head section 6. There is.

The lens holding device 2 is slidably engaged with a slide base 11 installed on a base surface only in the illustrated X-axis direction, and is positioned at a predetermined position on the X-axis by driving a pulse motor 12. An X-Y table 13 is placed approximately in the center of the base 1.
or mounted with its center located on the X axis,
A lens holder 14 is attached to this X-Y table 13.
are fixed with their centers aligned with each other. As seen in the partial side cross-sectional view of FIG. 5, the lens holder 14 is a hollow cylindrical body having a funnel-shaped opening at the top and a vacuum suction path 14' connected to the opening, and is placed on the upper end surface of the hollow cylindrical body. concave lens A
It serves the purpose of adsorbing and holding.

The center position of the lens holder 14 can be moved in the X-axis direction and the Y-axis direction by rotating micrometer heads 15 and 16, respectively.

The lens positioning/rotating device 3 always positions the concave lens A held by the lens holder 14 at a constant position based on its outer circumference, that is, so that its optical axis coincides with the center O of the X-Y coordinates. At the same time, when centering the convex lens B placed on the upper surface of the concave lens A and bonded with balsam adhesive, the convex lens B is pressed against the concave lens A in order to rotate the convex lens B by a predetermined angle, for example, 180° within a horizontal plane;
It is designed to be rotated by friction drive, and as shown in Fig. 4, the tip is in contact with the outer periphery of the concave lens A at two places, and the position of the concave lens A is fixed. A positioning arm 17 having a notch is fixed to the support 1 upright on the base 1.
The positioning arm 17 is slidably extended and held in the X-axis direction from the upper part of 8, and can be clamped at a predetermined extended position.
A lens pressure contact rotating portion 19 is provided opposite to the lens.

This lens press-contact rotating part 19 is fixed by extending horizontally from the upper part of a column 20 which is fixed upright to the base 1 via an L-shaped bracket, with the longitudinal direction of the base plate 21 being parallel to the X axis. A sliding plate 22 is also engaged with this base plate 21 so as to be slidable in the X-axis direction, and an air cylinder 24 is connected to an operating arm 23 vertically fixed to the lower surface of the sliding plate 22. The actuating rod is connected. Furthermore, although not shown in FIG. 1, a small gearbox 25 is attached to the sliding plate 22 near the left end, and gears 26 and 27 that mesh with each other are rotatably held in this small gearbox 25. A rubber roll 28 is fixed to the lower surface concentrically with the gear 27, and as shown in FIG. A fixed rack 30 is engaged. The air cylinder 24 is attached in a cantilevered manner to an L-shaped bracket 31 that extends and is fixed to the base 1. Therefore, the actuating rod is pushed out by the air cylinder 24 as shown in FIG.
When the sliding plate 22 is slid to the left along the base plate 21 via the actuating arm 23, the concave lens A is pressed by the rubber roll 28, and the positioning arm 17 is moved at two places on its outer circumference. The center position of the concave lens A is fixed by contacting the three-point contact including the rubber roll 28 by contacting the cylindrical notch. Next, when the small air cylinder 29 is operated in this state and its operating rod is pushed out, the rack 30 moves to the left in FIG. The gear 26 that meshes with the lever rack 30 rotates counterclockwise when viewed from above, and the gear 27 that meshes with the gear 26 rotates clockwise.
As mentioned above, since the rubber roll 28 pressing the outer circumference of the concave lens A is fixed to the gear 27 concentrically, it rotates in the same direction as the gear 27.
That is, it rotates clockwise when viewed from above, and as a result, the concave lens A also rotates counterclockwise while slipping between the notch of the positioning arm 17 and the upper end surface of the lens holder 14.

Now, if the number of teeth of the gears 26, 27 is Z ₁ , Z ₂ , the module of these gears 26, 27 and the rack 30 is m, and the stroke of the small air cylinder 29 is S, then S=N·πm (however, N is the number of teeth of the rack 30 corresponding to the stroke S). Therefore, the gear 26 has a rotation angle of 360° in the counterclockwise direction described above.
It rotates by N/Z ₁ , and the gear 27 similarly rotates clockwise by a rotation angle of 360°×N/Z ₁・Z ₁ /Z _{2 ==} 360°×N/Z ₂ .

Therefore, if the diameters of the concave lens A and the rubber roll 28 are dL and dG, respectively, then the rotation angle α of the concave lens A in the counterclockwise direction = dG/dL×360°×N/Z ₂ =S/πm
・ dG/dL・360°/Z ₂ .

In this case, if we take α≒180°, S=
πm・Z ₂ /2・dL/dG…(A) Therefore, if the stroke S of the small air cylinder 29 is set according to the above formula, the concave lens A can be rotated approximately 180° by the small air cylinder 29. can be moved.

The focal image observation microscope device 4 is a reflective optical microscope installed on a base 1 so that the optical axis of the objective lens barrel substantially coincides with the center O of the X-Y coordinates of the base 1. Although not shown, a focused optical image of both concave and convex lenses A and B is formed by the optical system of this microscope together with a measurement pattern consisting of an X-Y coordinate system provided in the optical system. A monitor television is connected to the television camera via an electric circuit and transfers the focused image together with the measurement pattern onto the image plane.

The adhered lens position correcting device 5 will be described with reference to FIG. 3, which is partially shown in cross section when viewed in the direction of the arrow in FIG. 1.

X on the auxiliary base 1' which is flanged to the base 1
- A Y-table 31' is attached, and by driving pulse motors 32, 32', the table 31' can be moved along the X-axis direction and the Y-axis direction, respectively. The X-Y table 31' has vertical guide rods 3 at the four corners.
Both upper and lower surface plates 3 are connected to each other via 3.
4, 34', the lower surface plate 34' is fixed. Then, the sliding block 35 is attached to the guide rod 33.
are slidably engaged with each other, and these sliding blocks 35 are fitted into through holes drilled at the four corners of the lifting surface plate 36, and the sliding blocks 3
5 is engaged with both the upper and lower surfaces of the lifting surface plate 36 via a snap spring so that it does not slip out. Furthermore, an air cylinder 37 is attached to the center of the upper surface plate 34, and the lower end of the operating rod of this air cylinder 37 is connected to the elevating surface plate 36. Therefore, by operating the air cylinder 37, the elevating surface plate 36 is moved up and down along the guide rod 33, and the lens position correction arm 38 is attached to the elevating surface plate 36 so that the lens position correction arm 38 is aligned with its central axis. As seen in FIG. 1, they are mounted in a cantilevered manner so as to be substantially overlapping with the Y-Y axis. The correction arm 38 is provided with a through hole at its tip so that the focal images of both the concave and convex lenses A and B can be captured by a reflective optical microscope, and this hole is largely chamfered on the lower surface side. ,
The correction arm 38 is lowered together with the elevating surface plate 36, and its tip presses the lens to be bonded, that is, the convex lens B, without any force, and the arm 38 is moved by a small amount in the X-axis direction and the Y-axis direction. Therefore, the position of the convex lens B is corrected.

The ultraviolet irradiation head section 6 is used to irradiate the balsam adhesive layer between the concave and convex lenses A and B with ultraviolet rays transmitted from an ultraviolet lamp device through an optical fiber to solidify it.

Next, the operation of this embodiment device will be explained.

First, loosen the clamp between the positioning arm 17 and the column 18 at its base, slide it slightly to the left along the X axis, and then place the adjustment lens on the top surface of the lens holder 14 instead of the concave lens The lens holder 14 is placed so that the center of the adjustment lens is approximately aligned, and the focused image of the adjustment lens by the reflective optical microscope is brought close to the origin of the X-Y coordinates that are simultaneously displayed while observing the image on the monitor television.
The upper position is manually corrected, and then vacuum suction is applied to fix it to the lens holder 14. After doing this, the position of the X-Y table 13 is finely adjusted by rotating the micrometer heads 15 and 16, and the focal image of the monitor television is adjusted to the X-Y position.
Completely overlap the coordinate origin. Next, the tip of the positioning arm 17 is gradually brought into contact with this adjustment lens, and the base of the arm 17 is clamped to the support 18. After completing this adjustment, both the concave and convex lenses A and B
The joining work is carried out in the following steps.

(i) Pick up the concave lens A with tweezers, place it on the top surface of the lens holder 14, put a small amount of balsam adhesive on the surface of the concave lens A, and then place the convex lens B so that it is almost concentric with the top surface of the concave lens A. The concave lens A is placed in the same manner and vacuum suction is applied to fix the concave lens A to the lens holder 14.

(ii) Activate the air cylinder 24, slide the sliding plate 22 to the left, and move the rubber roll 28 as described above.
The concave portion is pressed against the lens A, and the concave lens A is brought into contact with the notch of the positioning arm portion 17 and fixed in a fixed position.

(iii) Operate the air cylinder 37 to raise and lower the lifting surface plate 36.
At the same time, the lens position correction arm 38 is lowered,
As described above, the tip of the convex lens B is pressed against the concave lens A, and the balsam adhesive is uniformly spread between both the concave and convex lenses A and B.

(iv) Observe the positions of the focal images of both lenses A and B in the X-Y coordinates on a monitor television as described above.

On the screen of the monitor television, the area surrounded by the one-dot chain line shown in FIG. 6 is displayed in a large size.

In this image, the focal image F of both lenses A and B is X-
It can be seen that the Y coordinate is deviated from the origin O, in other words, the optical axis of the convex lens B is deviated from the optical axis of the concave lens A. In order to correct this deviation, read the X and Y coordinate values of the deviation and send the corresponding correction pulse to the X-Y table 3.
1' to the pulse motors 32 and 32', and the position of the lens B is corrected by minutely moving the lens position correction arm 38 in the X-axis direction and the Y-axis direction.

(v) Operate the air cylinder 37 to return the correction arm 38 to the upper standby position.

(vi) The air cylinder 29 is operated, and the concave lens A is rotated approximately 180 degrees by the rubber roll 28 as described above, and the result of the position correction of the convex lens B is confirmed by simultaneously rotating both of the convex lenses B.

(vii) The above operations (iv) to (vi) are performed when the focal image F is
Y
completely overlaps the origin O of the coordinates, and at the time of said rotation,
Repeat 2 to 3 times until the focal image F stops moving at all.

(viii) Finally, 10 UV rays are emitted from the UV irradiation head 6.
The balsam adhesive between the concave and convex lenses A and B is solidified by irradiation for about seconds, and the lenses A and B whose optical axes are aligned are joined together.

Of the above work steps, except for (i), a microcomputer and an interface (including a pulse motor driver) are installed, and by inputting the operation program into the microcomputer, each drive device is automatically operated as a sequence operation via the interface. They are made to act in a specific manner.

As a result, centering and bonding work for one pair of lenses can be completed in about 20 seconds, and concave and convex lenses A,
The optical axis of B can be aligned with a centering accuracy of within 7 μm.

〔effect〕

In the optical lens centering and bonding device according to the present invention, even an unskilled person can join two lenses by aligning their optical axes with a predetermined accuracy in less than 1/3 of the time required by conventional techniques. Since the observation using a reflective optical microscope required for this process is replaced by observation on a monitor TV screen, it is possible to reduce eye strain and increase productivity.

[Brief explanation of drawings]

FIG. 1 is an external plan view showing the configuration of the main parts of an optical lens centering and bonding device which is an embodiment of the present invention, FIG. 2 is an external side view thereof, and FIG. 4 is a partial plan view showing the relationship between both lenses on the lens holder, the positioning arm and the rubber roll; FIG. 5 is a partial side sectional view; and FIG. 6 is a monitor TV. It is an explanatory diagram of an image. DESCRIPTION OF SYMBOLS 1... Base, 2... Lens holding device, 3... Lens positioning and rotation device, 4... Focused image observation microscope device, 5... Bonded lens position correction device, 6...
...UV irradiation head, 13...X-Y table, 14...Lens holder, 15, 16...Micrometer head, 17...Positioning arm, 1
9... Lens pressure contact rotating part, 22... Sliding plate, 24
...Air cylinder, 26, 27...Gear, 28...
...Gum roll, 29...Air cylinder, 30...
Rack, 31'...X-Y table, 36...Elevating surface plate, 37...Air cylinder, 38...Lens position correction arm, A...Concave lens, B...Convex lens.

Claims (1)

[Claims] 1 A lens holder that holds the lower lens on the upper surface of two optical lenses stacked vertically with a balsam adhesive coating layer interposed therebetween, and a notch that abuts the lower lens held by this lens holder at the tip. a rotatable rubber roll that is disposed to sandwich the lower lens and face the lens positioning arm and that is horizontally pushed out by a linear drive mechanism to press the lens; and a rotatable rubber roll that rotates the rubber roll. a lens positioning/rotating device consisting of a lens positioning/rotating device; and an imaging surface at a position where focused optical images of the two optical lenses superimposed vertically are imaged together with a measurement pattern consisting of an X-Y coordinate system provided in the optical system. a reflection optical microscope equipped with a television camera such that the images match, and connected to said television camera via an electric circuit;
a focal image observation microscope device having a monitor television that simultaneously projects the focal image and the measurement pattern on a screen;
A Y table, an elevating mechanism attached to the X-Y table, and a pressing part that is held by the elevating mechanism and has a through hole formed at its tip and a chamfered lower edge of the through hole, and this pressing part an optical lens centering and bonding device comprising: a lens position correction device having a lens position correction arm for slightly moving the upper lens to be bonded pressed by the X-Y table; .