JPS6235983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a lens bonding method and an apparatus therefor.

(Prior art) Lenses used for photography and other optical systems are sometimes manufactured by laminating multiple lenses together in order to eliminate various aberrations and improve optical characteristics. .

However, adhesives such as natural resin (Canadian balsam) or synthetic resin (epoxy resin two-component) are generally used to bond the above-mentioned lenses. In the case of a synthetic resin, it is heat-compressed or vacuum-heat-compressed to an appropriate viscosity, and in the case of a synthetic resin, the mixture ratio of the two components is adjusted, thoroughly stirred, and the mixture is heated to 70 to 90℃ in advance.
After applying the adhesive to the bonded surface of the heated lens, place another lens on it and it bubbles. After wiping off the protruding adhesive, align the optical axes of the two bonded lenses using a centering microscope and center them. After completion, 2 to 4 points are fixed with plaster, dried, and then returned to room temperature to remove distortion.

(Problems to be Solved by the Invention) However, in past bonding using any of the above adhesives, most of the process has been done manually, which not only results in extremely low work efficiency; A highly skilled technique is required, and in particular, centering of the laminated lens requires that the deviation of the optical axis from the focal length of the lens be within 0.01, so an extremely high level of technique is required. Furthermore, in the case of bonding using the epoxy resin adhesive, there are problems such as liver damage caused by the gas generated, and skin damage such as a rash caused by the adhesive.

In view of this, the present invention eliminates the various disadvantages caused by the fact that most of the conventional processes are manual work,
A lens that does not require a high degree of skill, can be laminated with high efficiency, eliminates the harmful effects of adhesives on the human body, and eliminates the need to hold the lens horizontally after centering, so it does not require a large space. The purpose of this work is to provide an adhesive method and device.

[Structure of the invention]

(Means and effects for solving the problems) In order to solve the above-mentioned problems of the prior art, the present invention uses upper and lower bell spindles, and the lower lens holder of the lens holder provided at the opposing parts of these bell spindles. Place the lower lens on top, then move the upper and lower lens holders relatively close together to sandwich the lens between the upper and lower lens holders to perform centering, and after centering is completed, separate the upper lens holder. At the same time, hold the lens in the lower lens holder, apply adhesive to the top surface of the lens, place the upper lens, sandwich both lenses again between the upper and lower lens holders, and attach the upper and lower lenses. Spreading the adhesive evenly between the mating surfaces of the lens by rotating at least one of the spindles relative to the other, and simultaneously deaerating the adhesive;
The first invention is a lens bonding method characterized by releasing the holding of the lens and drying the bonded portion, and then taking out the bonded lens. upper and lower bell spindles supported by the upper and lower bell spindles, an upper lens holder and a lower lens holder that are provided at opposing parts of these bell spindles and can hold the upper and lower lenses, respectively; and at least one of the upper and lower bell spindles to the other. A second lens bonding device is provided, comprising: a bell spindle driving device that rotates the lens holder; The third invention is a lens bonding device in which a vacuum suction source is connected to the lower lens holder of the present invention to suction and hold the lens on the lower lens holder.

(Example) Hereinafter, the present invention will be explained using examples shown in the drawings.

Figures 1 to 3 show specific examples of the method of the present invention and a bonding device suitable for carrying out the method.
A lower bell spindle 3 and an upper bell spindle 4 are rotatably supported by bearings 5 and 6 with their axes aligned on the fuselage 1 and the arm 2 of the fuselage 1, respectively. Cup-shaped lens holders 7 and 8 are provided so as to face each other.

The lens holder 8 of the upper bell spindle 4 is provided downward at the lower end of a shaft 9 passing through the axis of the spindle 4, and the upper end of this shaft 9 is connected to a piston rod 11 of an air cylinder 10 fixed to the fuselage 1. By supplying and discharging pressurized air to and from the cylinder 10, the upper lens holder 8 can be moved up and down.

A gear 12 provided on the outer circumference of the lower bell spindle 3 is meshed with an idle gear 17 that is rotated from a variable speed motor 13 installed in the aircraft body 1 via a reduction gear 14, a transmission mechanism 15, and a torque limiter 16. Further, the gear 18 provided on the outer periphery of the upper bell spindle 4 is provided with the torque limiter 16.
The shaft 19 rotates through the electromagnetic clutch 20, and the shaft 2
An idle gear 22, which is rotated through 1, is engaged with the idle gear 22. The idle gears 17 and 22 have different numbers of teeth, and in the embodiment, the number of teeth for the lower bell spindle is 32, and the number of teeth for the upper bell spindle is 30. It is configured so that a difference in rotational speed occurs. Note that the means for transmitting rotation to the upper and lower bell spindles 3 and 4 and the means for giving a difference in the number of rotations are not necessarily limited to gears and gear ratios, but may also be based on transmission mechanisms such as chains, belts, etc. It's okay.

An air suction passage 23 is formed at the axis of the lower bell spindle 3, the upper end of which is opened into the lower lens holder 7, and the lower end of which is connected to a vacuum pump 24 as a negative pressure generator via a rotary joint (not shown). They are communicated by a connected hose 25.

The body 1 is provided with a support 26 that rises at an angle in a direction away from the lower lens holder 7. On this support 26, an adhesive is applied to the bonding surface of the lens placed on the lower lens holder 7. A dripping adhesive supply device 27 is provided.

As shown in an enlarged view in FIG. 3, the adhesive supply device 27 supplies the fixing member 2
Air cylinder 2 for nozzle elevation fixed by 8
9 and the piston rod 3 of this air cylinder 29
an adhesive drip nozzle 33 attached via an arm 32 to a support member 31 coupled to 0;
The nozzle 33 is connected to an adhesive tank 34 as an adhesive supply source attached to the machine body 1 through a hose 35, and its direction can be freely adjusted by a joint 36 provided in the middle of the arm 32. ing.

The configuration of the adhesive dripping nozzle 33 is not shown in detail, but a built-in solenoid valve SV ₃ operates the valve body to inject a predetermined amount of adhesive into the nozzle 3.
It is dripped from the tip of 3 in the form of a drip.

The support member 31 includes a guide rod 38 that is slidably inserted into a fixing member 37 fixed to the support column 26.
is attached to the guide rod 38, and a switch operating member 39 is provided on the guide rod 38.
is disposed so as to be able to freely come into contact with the actuator of the switch MS 1 which issues a discharge signal to the switch MS ₃ which issues a discharge signal to _the adhesive discharge solenoid SV ₃ provided on the fixing member 37 .

The adhesive tank 34 is of a closed type, and is configured to feed the adhesive by air pressure that is press-fitted from the outside, but this may be done by other pressure feeding means.

each lens holder 7 of the lower bell spindle 3 and the upper bell spindle 4 in the lowered state;
On the fuselage 1 on the side of 8 is a drying device 4 using ultraviolet light.
0 is set. In this embodiment, the drying device 40 includes an ultraviolet lamp 42 inside an outer casing 41 fixed to the body 1, and a window hole 43 is provided in the outer casing 41 on the front side of the ultraviolet lamp 42. This window hole 43 is opened and closed by a shutter plate 44 provided on the outer casing 41 so as to be movable up and down. This shutter plate 44 is a solenoid SV ₅
The lifting and lowering movements are now controlled by
The energization of this solenoid SV ₅ is controlled by a push switch PS ₅ .

As shown in FIG. 4, the piping system for pressurized air in each of the above parts is from a pressure air supply source 45 through a first regulator 46 to the head side and bottom side of the air cylinder 10 for lifting and lowering the upper lens holder of the upper bell spindle 4. A piping system 47 in which solenoid valves SV ₁ and SV ₆ are inserted for supplying and discharging pressurized air, and an air cylinder 2 that moves the adhesive drip nozzle 33 up and down.
Solenoid valve that supplies and discharges pressurized air to 9.
A piping system 48 having a solenoid valve SV ₂ installed therein, a piping system 49 having a solenoid valve SV ₅ that opens and closes the shutter plate 44 of the drying device 40, and a piping system that pumps pressurized air to the adhesive tank 34 through the second regulator 50. 51, and a piping system ₅₄ having a solenoid valve SV3 for supplying and discharging pressurized air to and from an air cylinder 53 that discharges adhesive from the adhesive dripping nozzle 3 through a third regulator 52.

Next, the operation of the above embodiment will be explained in conjunction with the flowchart shown in FIG.

In FIG. 1, when one lens to be bonded is placed on the lower lens holder 7 of the lower bell spindle 3 and the push switch PS ₁ is operated, the upper lens holder 8 of the upper bell spindle 4 is actuated via the relay R ₁ . The solenoid valve SV ₄ is energized, pressurized air is supplied to the head side of the air cylinder 10, the shaft 9 is lowered, and the upper lens holder 8 hits the upper part of the lens placed on the lower lens holder 7. Centering is performed by centripetal action. At this time, by operating the push switch PS ₃ , the solenoid valve SV ₄ is actuated via the relay R ₂ , and the negative pressure from the vacuum pump 24 acts on the inside of the lower lens holder 7 through the passage 23 to attract and hold the lens.

After confirming that the lens is centered and held by suction, operate the push switch PS ₂ .
Solenoid valve SV ₁ is activated via relay R ₁ ,
Pressure air is supplied to the bottom side of the air cylinder 10, and the upper bell spindle 4 is raised. At this time, if you operate push switch PS ₅ , relay R ₃
The solenoid valve SV ₂ is energized via the solenoid valve SV 2 , and pressurized air is supplied to the head side of the nozzle lifting air cylinder 29 to extend the piston rod 30 .
3 is lowered obliquely from above toward the upper surface of the lens centered and held by suction on the lower lens holder 7, and stopped at a predetermined position. During this stop, the limit switch _MS1 is turned on by the switch operating member 39, so the solenoid that operates the valve body of the adhesive drip nozzle 33 via the relay _R4
The SV ₃ is energized to open the valve body, and the air cylinder 53 drips adhesive from the tip of the nozzle 33. The discharge amount of this adhesive is predetermined as a time by timer _T1 ,
Generally, it is in the range of 0 to 10 seconds.

When the discharge of an appropriate amount of adhesive for a predetermined time period is completed, the solenoid valve _SV3 is demagnetized by the signal from the timer _T1 , and the valve body is closed to stop the discharge. In this case, since the adhesive has viscosity, after the timer T ₃ has elapsed in the range of 0 to 10 seconds as the thread trimming time, a signal is given to the solenoid valve SV ₂ via the relay R ₃ , and the air cylinder for raising and lowering the nozzle is Pressure air is supplied to the bottom side of the adhesive dripping nozzle 33, and the adhesive dripping nozzle 33 is raised and returned diagonally upward.

When the dripping of the adhesive is completed as described above, place the lens to be bonded on top of this lens, operate the push switch PS ₂ again to excite the solenoid valve SV ₁ , and then press the upper lens holder 8. lower. When the upper lens holder 8 comes into contact with the upper surface of the superimposed upper lens, centering is achieved by its centripetal action.

Next, operate the PS ₇ switch to relay
When the variable speed motor 13 is excited through R ₇ and R ₉ , the upper and lower bell spindles 3 and 4 are driven to rotate through idle gears 17 and 22 of the transmission mechanism, respectively.
At this time, since the idle gears 17 and 22 have different numbers of teeth, the upper and lower bell spindles 3,
4, and as a result, the upper and lower lenses clamped between the upper and lower lens holders 7 and 8 are misaligned in their mating surfaces due to the difference in the rotation speeds.
The adhesive interposed between the mating surfaces is gradually rubbed together and evenly spread in the outer circumferential direction, and air bubbles are discharged at the same time as it is evenly stretched over the entire region between the mating surfaces.

The above-mentioned adjustment work is carried out for a time set in advance by a timer _T6 , and when the set time is reached, a signal from the timer _T6 is sent to the shutter plate 44 of the drying device ₄₀ via a relay R8.
The solenoid SV ₅ that operates is energized to move the shutter plate 44 and open the window 43 of the outer casing 41. At the same time, the solenoid valve SV ₄ is activated to cut off the suction by the vacuum pump 24, introduce atmospheric pressure, eliminate the negative pressure acting on the lower lens holder 7, and release the lens from being held by suction.

The rotation of the motor 13 is predetermined by a timer _T5 , and the drive of the motor 13 is stopped via relays _R7 and _R9 after a predetermined period of time has elapsed. The adhesive is cured by the ultraviolet lamp 42 until the motor 13 is stopped.

When the motor 13 is stopped, the solenoid valve SV ₅ is demagnetized via the relay R ₈ , the shutter plate 44 is returned to close the window 43, and the solenoid valve SV ₆ is re-energized to re-energize the upper lens holder 8. Then, the solenoid valve SV ₄ is activated to attract the lens to the lower lens holder 7 again.

Thereafter, the timer T ₇ pulls up the shaft 9 of the upper bell spindle 4 via the relays R ₅ and R ₁ to raise the upper lens holder 8 . In this case, since the lens is suction-held by the lower lens holder 7, even if the upper lens holder 8 and the lens stick together due to oozing of adhesive, the lens will not be lifted up.

The timer starts after the upper lens holder 8 returns to the upper position.
Resetting is completed by _T3 via relays _R5 and _R1 , and at the same time, solenoid valve _SV4 is turned off via relays _R6 and _R2 , releasing the adsorption force of the lower lens holder 7, and relay R is activated by timer _{T4. 6} , reset adsorption via _R2 .

In the above embodiment, the ultraviolet irradiation control by the drying device 40 is performed by opening and closing the shutter plate 44, but in this case, the drying device 40 is rotatably installed in the body 1,
The direction may be changed and irradiated only during irradiation. Although not shown in the figure, by installing a grinding device on the body 1 for the lens holding edges of the upper and lower lens holders 7 and 8, the holding edges of the lens holders 7 and 8 can be ground at any time for correct centering. It can also be adapted to suit.

〔Effect of the invention〕

As explained above, the present invention includes dripping an adhesive onto the bonding surfaces of lenses to be bonded, centering the upper and lower lenses, a clamping operation, spreading the adhesive,
Since the entire drying process is performed automatically without any manual intervention, it is possible to improve the efficiency of manual labor and the negative effects on the human body.

In addition, since the upper and lower lens holders are rotated and rubbed together after the adhesive has been dripped, the adhesive can be spread evenly, and if the upper and lower lens holders are given a rotational difference at this time, even better bonding and reliable bonding can be achieved. Can be degassed. In addition, the lower lens can be automatically centered by processing the upper lens holder; at this time, the lower lens can be automatically centered by lowering the upper lens holder; By suctioning and holding the lens to the lower lens holder using negative pressure, that state can be maintained reliably, and after the upper lens is bonded, the suction force is released once and the bonded lens is attached to the lower lens by its own weight. Since it is supported on the holder, there is no risk of distortion of the lens during drying, and when the upper lens holder rises and releases, it applies suction force to the lower lens holder again and holds it by suction, so that it can be bonded when the upper lens holder rises. There is no need to pull up the lens, so there is no risk of dropping the lens.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a specific example of the lens bonding device according to the present invention, FIG. 2 is a front view of the adhesive supply device with the phase shifted for convenience, and FIG. 3 is the bonding device shown in FIG. 1. FIG. 4 is an explanatory view showing the air piping system of each part, and FIG. 5 is a flowchart showing the operating order of each part. 1... Body, 2... Arm, 3... Lower bell spindle, 4... Upper bell spindle, 7... Lower lens holder, 8... Upper lens holder, 9...
... shaft, 10 ... air cylinder for raising and lowering the upper lens holder, 12, 18 ... gear, 13 ... variable speed motor, 17, 22 ... idle gear, 23 ... air suction passage, 24 ... vacuum pump, 26 ... ...pillar,
27... Adhesive supply device, 29... Air cylinder for nozzle elevation, 33... Adhesive drip nozzle, 34
...Adhesive tank, 40...Drying device, 42...
Ultraviolet lamp, 43... Window hole, 44... Shutter plate, 45... Pressure air supply source, 46, 50, 52
... Regulator, 47, 48, 49, 51, 5
4...Piping system.

Claims (1)

[Claims] 1. Using upper and lower bell spindles, the lower lens is placed on the lower lens holder of the lens holders provided at the opposing parts of these bell spindles, and then the upper and lower lens holders are moved relative to each other. The lens is sandwiched between the upper and lower lens holders to perform centering, and after centering is completed, the upper lens holder is separated and the lens is held in the lower lens holder, and in this state, the adhesive is applied. After applying the adhesive to the top surface of the lens, place the upper lens on the lens, hold both lenses again using the upper and lower lens holders, and rotate at least one of the upper and lower bell spindles relative to the other to apply the adhesive to the lens. A method for adhering a lens, which comprises spreading the lens evenly between mating surfaces, deaerating the lens at the same time, releasing the holding of the lens, drying the adhesive part, and then taking out the lens that has been bonded. 2. A fuselage, upper and lower bell spindles rotatably supported by the fuselage on a coaxial line, an upper lens holder and a lower lens holder that are provided at opposing parts of these bell spindles and can hold the upper and lower lenses, respectively, and the upper and a bell spindle driving device for rotationally driving at least one of the lower bell spindles relative to the other, and configured to be able to move at least one of the upper and lower lens holders in directions toward and away from the other. Features: Lens bonding device. 3. The lens bonding device according to claim 2, wherein the spindle drive device includes a transmission mechanism that transmits rotation by imparting a relative speed difference to the upper and lower bell spindles. 4. A fuselage, upper and lower bell spindles rotatably supported by the fuselage on a coaxial line, an upper lens holder and a lower lens holder that are provided at opposing parts of these bell spindles and can hold the upper and lower lenses, respectively, and the upper and a bell spindle drive device for rotationally driving at least one of the lower bell spindles relative to the other, and configured to be able to move at least one of the upper and lower lens holders in directions toward and away from the other; 1. A lens bonding device, characterized in that a vacuum suction source is connected to the lower lens holder to suction and hold the lens on the lower lens holder.