CN100488719C - Device and method for blocking optical lens - Google Patents

Abstract

A device and a method for blocking an optical lens, the device wherein a centering device (13) is installed around a loading table (11) on which a lens blank (1) is installed and the geometrical center of the lens blank (1) is aligned with the center of the loading table (11). The centering device (13) comprises three clamp pins (31) pressing the outer peripheral surfaces of the lens blank (1). The loading table (11) on which the lens blank (1) is installed is pushed up from a centering position (H1) to a block position (H2) by a moving device (12) when centering is completed, and the concave side outer peripheral edge of the lens blank (1) is pressed against the lower surfaces of the locking parts (31A) of the clamp pins (31). After a specified amount of wax (4) is dripped on the lens blank (1), a fixture (2) is lowered by a specified amount to press it against the wax on the lens blank (1) to thinly diffuse and solidify the wax so as to join the lens blank (1) to the fixture (2).

Description

The device and method that is used for blocking optical lens

Technical field

The device and method of relevant a kind of (blocking) optical lens that is used for boning of the present invention.

Background technology

Traditionally, when making lens by round lens matrix with unprocessed convex surface, by (for example by numerically control grinder, general polissoir TORO-X2SL by the LOH manufacturing) convex surface with lens matrix cuts or grinds to form predetermined surface configuration, be a bit larger tham the processing dimension that comprises grind (lapping stock) or polishing surplus (polishing stock) to have, and then described convex surface be polished to predetermined curved surface manufacturing by polissoir.

According to United States Patent (USP) the 5th, 421, No. 770, in cutting or polishing lens matrix, lens matrix is connected to polissoir by the lens holding unit that is adhered to non-polished surface.

According to the present invention, in the following description, lens matrix will be known as lens blank, and lens keep instrument will be known as the lens holding unit.By adhesive lens blank is fixed to the lens holding unit and will be known as bonding operation or bonding.The device of carrying out this bonding operation or bonding will be known as adhering device.For example, the known device that is called positioning bonding device (layoutblocker) for by the LOH manufacturing is used as adhering device.

With regard to the bonding lens blank, in the adhering device disclosed in the Japanese Patent Laid-Open Publication 2003-334748, as shown in Figure 13, lens blank 1 is configured on the lens holding unit 2 by bonding ring (blocking ring) 3.The adhesive 4 of fusing is perfused in the space that three members (that is, lens blank 1, lens holding unit 2 and bonding ring 3) are surrounded and is cooled and solidifies the lens blanks 1 so that scioptics holding unit 2 bonds.Usually will have low-melting alloy or wax as adhesive.

In this adhering device, be equipped with dissimilar lens holding unit 2 and bonding ring 3 corresponding to the type of lens blank 1.In bonding operation, chosen and be used to make the central authorities of adhesive 4 to have predetermined thickness corresponding to the lens holding unit 2 of the lens blank 1 that is adopted and bonding ring 3.In Figure 13, reference symbol 5 expression workbench; And 6 expression be used for bonding ring 3 is fixed to the fixture of workbench 5.

When lens blank 1 was bondd by lens holding unit 2, the center of lens blank 1 must be accurately consistent with the center of lens holding unit 2.With regard to this purpose, in centring means disclosed in Japanese Patent Laid-Open Publication 09-290340 number, 11-325828 number and the similar publication and similar device, lens blank 1 is clamped and with respect to lens holding unit 2 centering places.

Centring means disclosed in Japanese Patent Laid-Open Publication 09-290340 number is mechanically with the device of lens centering according to the periphery surface of lens.In bonding operating period, pivot with the retaining part that promotes three lever members against the periphery surface of living lens around the annular component of lens, thereby with the lens centering.

Japanese Patent Laid-Open Publication relates to a kind of measuring method and equipment 11-325828 number, for optical element with concave surface, for example, concavees lens or concave mirror can obtain the center of the outer shape of the center of concave surface and optical element by described measuring method and equipment.According to this equipment, the marginal portion of the concave surface of optical surface is cut to form the plane.3 coordinate on the circle that described plane surrounded is measured by the distance-measuring device of the amount of movement of differential interference microscope and measurement movable table.Go out the center of described circle from measured coordinate Calculation, and the center that is calculated is confirmed as the center of concave surface.

Summary of the invention

Problem solved by the invention

The centring means of being put down in writing in Japanese Patent Laid-Open Publication 09-290340 number needs a large amount of elements, for example, cylindrical member, annular component, three rollers, three leverage components, bias unit, maintaining part releasing device and likes of having guide part and cam surface.Therefore, the structure of this centring means becomes complicated and causes high manufacturing cost.Therefore, this centring means is unpractical.

The optical element measurement device of being put down in writing in Japanese Patent Laid-Open Publication 11-325828 number is made of the X-movable table and the Y-movable table of mobile movable table on orthogonal direction, and optical element is placed on the described movable table.The amount of movement of X-movable table and Y-movable table is measured by distance-measuring device.By arithmetic operation unit the signal corresponding to the amount of movement of each movable table that transmits from described distance-measuring device is calculated to obtain the center and the eccentric direction of optical element.Therefore, equipment itself is than expensive.Therefore, seek exploitation to cheap centring means.

During feeling relieved, because the accuracy of lens bonding directly influences the machining accuracy of lens, so need high accuracy.Because use the lens blank 1 of a large amount of types, yet traditionally, the bonding operation is manually carried out by the operator.Therefore, high accuracy can't be obtained, and operator's burden can be increased.In addition, the extremely difficult supply of controlling adhesive 4 very accurately.More specifically, when aiming at lens blank 1 and lens holding unit 2, the operator aims at them by range estimation so that the difference between the diameter of the diameter of bonding ring 3 and blank becomes equates all the time at whole periphery, perhaps the operator regulate moving of lens blank 1 so that the CCD camera with image sensing to the same monitor of periphery and demonstration lens blank 1 of lens blank 1 on shown reference line consistent, thereby guarantee the accuracy that bonds.This position adjustment operation changes according to the operator, thereby causes relatively poor accuracy and cause error.In addition, described operation causes heavier burden to the operator, and therefore expends time in.

In bonding lens blank 1, when lens blank 1 when supine bonding target surface is placed on workbench or the analog with it, the height of the optical surface that bond changes according to the thickness of the peripheral edge of lens blank 1.Therefore, the bonding ring 3 that need be complementary with the thickness of the peripheral edge of lens blank 1.As a result, increased the number of types of bonding ring 3, and the storage and the management of bonding ring 3 can cause trouble.

Traditionally, in advance lens blank 1 is placed on the bonding ring 3.Between lens blank 1 and lens holding unit 2, set predetermined gap.Adhesive 4 is perfused in the described gap and is cooled and solidifies.If it is narrow to be positioned at the gap of center, then adhesive 4 is not easy the arrival center, therefore causes the error of dioptric power.On the contrary, if described gap is wide, then increase the use amount of wax 4 inevitably.Therefore can increase the influence of thermal contraction, and the dioptric power of lens becomes unstable.Therefore, must control the use amount and the thickness of adhesive 4 very exactly.Adhesive 4 melt temperatures own are about 50 ℃ to 80 ℃.When being filled into adhesive 4 in the described gap, if adhesive 4 is seized heat and cooling by lens holding unit 2 or lens blank 1 and solidifies, then it can't cover the whole adhesive surface of lens holding unit 2, and can't obtain enough bonding strengths.

If adhesive 4 did not just begin to solidify, then can produce bubble in the adhesive 4 before its supply operation also finishes.In this case, adhesive 4 can't cover the whole adhesive surface of lens holding unit 2 equally, and can't obtain enough bonding strengths.

In the operation in the gap that adhesive 4 is fed between lens blank and the lens holding unit, press the button by the operator usually adhesive 4 is filled in the described gap.The operator visually confirms stop supplies adhesive after the adhesive 4 that is poured into has reached scheduled volume at him or she.This can increase operator's burden.In addition, supply and unstable.If supply is excessive, then adhesive 4 can overflow and be attached to the periphery surface or the concave surface of lens blank 1 from the gap between lens blank 1 and the lens holding unit 2.If supply is too small, then can't obtain enough cohesive forces.Variety of issue can appear in mode according to this.

In order to solve aforesaid traditional problem the present invention is proposed, and will provide a kind of device of blocking optical lens that is used for as one object of the present invention, described device does not need the bonding ring, and the level and smooth optical lens with peripheral part of different-thickness can be moved to reliably predetermined bonding position place.

Another object of the present invention provides a kind of device that is used for blocking optical lens, thus by simple centring means reliably with the optical lens centering.

Another purpose of the present invention provides a kind of device and method that is used for blocking optical lens, very accurately is complementary with size, shape and the similar characteristics of optical lens thereby can control the supply of adhesive and thickness.

The settling mode of problem

In order to obtain above-mentioned purpose, according to first invention, a kind of device that is used for blocking optical lens is provided, described device comprises by adhesive has the lens of optical lens to keep instrument, described device comprises: loading platform, and optical lens is placed on the described loading platform with its supine concave surface; Centring means, described centring means make the geometric center of optical lens consistent with the center of described loading platform; With the dripping device of drops of adhesive to the concave surface of optical lens; And mobile device, described mobile device moves to the bonding position place that described lens keep instrument with optical lens.

According to second invention, a kind of method that is used for blocking optical lens is provided, described method places the adhesive of fusing between optical lens and the lens maintenance instrument and the adhesive that makes fusing keeps instrument optical lens is fixed to described lens, and the step that described method comprises is: with drops of adhesive to the concave surface of optical lens; Promote described lens maintenance instrument prop up on the optical lens adhesive so that adhesive scatter and to come so that described lens keep instrument and optical tooling to keep predetermined gap; And cooling adhesive and it is solidified, so that described lens keep instrument and optical lens to be bonded into one.

Effect of the present invention

First invention comprises the mobile device that optical lens is moved to bonding position.Therefore, have that various types of optical lenses for the peripheral edge of different-thickness can move to bonding position reliably and by described lens maintenance instrument bonding.

In addition, described dripping device can very accurately be controlled the supply of adhesive.Therefore, adhesive can not overflow from concave surface, and does not need to adopt the bonding ring.

According to second invention, when described dripping device on described concave lens surface the time, can be controlled the amount of dripping of adhesive with drops of adhesive exactly.Can keep instrument and similar device to calculate and determine the amount of dripping of adhesive according to optical lens and lens in advance.

Keep instrument relative during when controlling optical lens and described lens exactly, can keep setting predetermined gap between the adhesive surface of instrument and the described concave lens surface at described lens near the amount of movement on the direction each other.

With after drops of adhesive is to the concave surface of optical lens, the adhesive that is dripped keeps the instrument pressurized and scatters into predetermined thickness by described lens.To bubble can be not form in the adhesive, and high bonding strength can be obtained.Adhesive will can not spill into and pollute optical lens or device outside the described concave lens surface.Adhesive will can not become to be short to and be not enough to blocking optical lens.Therefore, do not need to use the bonding ring that keeps instrument around described lens, thereby can reduce number of elements.

Description of drawings

Fig. 1 is for showing the graphic of state that lens blank is bondd by the lens holding unit;

Fig. 2 is the outward appearance perspective view according to the major part of adhering device of the present invention;

Fig. 3 is the perspective view of the centering part of adhering device;

Fig. 4 is the sectional view of centering part;

Fig. 5 is locked in state graphic at bonding position place for showing lens blank;

Fig. 6 is for showing the graphic of dripping device;

Fig. 7 is graphic for the inside that shows gear pump;

Fig. 8 is the curve map of the relation between the amount of dripping of demonstration wax and the number of pulses that is fed to stepping motor;

Fig. 9 is be used to illustrate the bonding operation that is used for lens blank graphic;

Figure 10 is be used to illustrate the bonding operation that is used for lens blank graphic;

Figure 11 is be used to illustrate the bonding operation that is used for lens blank graphic;

Figure 12 is be used to illustrate the bonding operation that is used for lens blank graphic; And

Figure 13 is for showing the sectional view that uses bonding to encircle the conventional situation of the lens blank that bonds.

The specific embodiment

Describe the present invention in detail according to the embodiment shown in graphic.

Referring to Fig. 1, reference symbol 1 expression lens blank; 2 expressions keep the lens holding unit of instrument as lens; 4 expressions are adhered to lens blank 1 adhesive of lens holding unit 2 integratedly; And 6 the expression diaphragm.

Lens blank 1 is made for plastics false add worker's lens and by diethylene glycol (DEG)-carbonic acid diallyl base resin (diethylene-grycol-bisallyl-carbonate-based resin) (refractive index=1.50), urethane ester group resin, epithio base resin (refractive index=1.55 are to 1.75) or similar material (for example).The concave surface 1a of lens blank 1 is formed by the optical surface with predetermined radius of curvature, and as the bonding target surface that is bondd by lens holding unit 2.The polishing target surface of convex surface 1b for being polished by polishing machine, after the bonding target surface 1a of adhering device bonding lens blank 1 according to the present invention, described bonding target surface is finish-machined to predetermined optical surface.When the size according to lens blank 1 they are carried out the branch time-like, they have four types diameter LDb, for example, and 80mm, 75mm, 70mm and 65mm.

The lens holding unit 2 of bonding lens blank 1 is by having less than the Al dish 2A of the maximum gauge YDh of the diameter LDb of lens blank 1 and at being made of the made annular protrusion 2B of SUS303 that the back side central authorities of dish 2A protrude integratedly.The front surface 2a of dish 2A is used to bond the adhesive surface of lens blank 1, and is formed by the convex surface with radius of curvature Ch, and wherein radius of curvature Ch equals or substantially near the radius of curvature R of the concave surface 1a of lens blank 1.On the whole surface of front surface 2a, form thin oxide film by the anode processing.In this embodiment, adhesive surface 2a is coated with color by the micropore that utilizes anode to handle formed oxide-film.The back side 2b of dish 2A forms when lens holding unit 2 is installed to burnishing device or topping machanism the plane of reference as a reference.The auxiliary section that protuberance 2B formation matches with the chuck of burnishing device or topping machanism.

This lens holding unit 2 is equipped to the polytype corresponding to the type of lens blank 1, for example, and as shown in form 1.More specifically, with regard to the type of lens holding unit 2, can adopt four different diameter YDh (80mm, 75mm, 70mm and 65mm), and can adopt five different bonding surface 2a radius of curvature Ch (R162, R105, R76, R61 and R55), thereby provide 16 types altogether that form by the combination of different-diameter YDh and different bonding surface 2a radius of curvature Ch.In the bonding operation, in described lens holding unit 2, optionally use to have radius of curvature R and the radius of curvature Ch of diameter LDb and the lens holding unit of diameter YDh that equates or be similar to the concave surface 1a of lens blank 1.Select corresponding to the lens holding unit 2 of lens blank 1 so that the shape of the adhesive surface 2a of lens holding unit 2 when consistent in fact with the shape of the concave surface 1a of lens blank 1 when mode according to this, the gap between concave surface 1a and the adhesive surface 2a can be set on whole surface constant substantially.Therefore, can supply the adhesive 4 of appropriate amount and shorten cool time of adhesive 4.

Form 1

Note: o=sets in advance, and x=does not set in advance

Wax or low-melting alloy (Bi, the Pb, Sn, Cd or the In alloy that for example, have 47 ℃ fusing point) are used as adhesive 4.This embodiment will illustrate the situation of using high viscosity wax (having 70 ℃ to 80 ℃ suitable serviceability temperature).Wax 4 is for the compound mainly made by Tissuemat E and comprise hydrocarbon (C as main component _nH _2n).The physical property of wax 4 comprises 57 ℃ softening point, 300 ℃ flash point, 0.92g/cm ²Density (25 ℃) and the viscosity (100 ℃) of 300mPas.Wax 4 is water insoluble.

When scioptics holding unit 2 bonding lens blanks 1, it is usually by diaphragm 6 and bonded.The concave surface 1a that diaphragm 6 is used to prevent lens blank 1 is impaired and be easy to remove wax 4 during polishing.For example, the film with the three-decker that comprises top layer, intermediate layer and tack coat is used as diaphragm 6.When diaphragm 6 was three-decker, top layer and intermediate layer were made by polyethylene, and tack coat is made by polyolefin.The thickness of top layer, intermediate layer and tack coat is about 10 μ m, 85 μ m. and 25 μ m respectively.With regard to the physical property of diaphragm 6, diaphragm 6 at room temperature is membranaceous solid and has 110 ℃ to 130 ℃ fusing point and 0.9 to 1.0 proportion.

Another example of diaphragm 6 can have the double-layer structure of the tack coat that comprises the basic unit of being made by poly-alkene and made by polyolefin.With regard to the physical property of this diaphragm 6, diaphragm 6 is membranaceous solid at room temperature, and has 110 ℃ to 130 ℃ fusing point and 0.9 to 1.0 proportion.

Referring to Fig. 2, reference symbol 10 represented adhering devices are the device by lens holding unit 2 bonding lens blanks 1.Adhering device 10 comprises on it the loading platform (loading table) 11 of placing lens blank 1, in bonding operating period with lens blank 1 from center H ₁Move to bonding position H ₂Mobile device 12 (Fig. 4) (Fig. 5), with the centring means 13 of lens blank 1 centering, wax 4 is dripped to the gap setting device 15 of setting predetermined gap during dripping device 14 on the lens blank 1, the bonding between lens blank 1 and lens holding unit 2, controller (not shown) and the similar device of controlling whole adhering device.

Referring to Fig. 4, loading platform 11 is connected to the upper end of vertically moving back shaft 17.Pad 19 is placed on the upper surface of loading platform 11 by O type ring 18.Adopt pad 19 to make and during feeling relieved, be easy to mobile lens blank 1.Loading platform 11 is connected to back shaft 17 can swing (rotation) on all directions by pendulous device 20, makes loading platform 11 can deal with various types of lens blanks 1.Therefore, even lens blank 1 has prismatic shape roughly, and the thickness of its peripheral part can change in a circumferential direction, when loading platform 11 be inclined relative to horizontal by pendulous device 20 so that lens blank 1 at the peripheral edge of concave surface 1a side during near the lower surface of the sticking department 31A of three pins (being called clamp pin hereinafter) 31 (explanation after a while), the concave surface 1a of lens blank 1 also can keep level.Pendulous device 20 further comprises a plurality of stretchable helical spring 21 around back shaft 17 assortments.Stretchable helical spring 21 biased downward loading platforms 11.

With lens blank 1 from center H ₁Move to bonding position H ₂Mobile device 12 form by cylinder with speed control 24, wherein said speed control is connected to the lower surface of slide plate 22 by carriage 23 and faces up.Mobile device 12 is by stretchable action bars 26 vertical mobile back shafts 17.

Slide plate 22 has patchhole 25, the described patchhole of mobile device 12 extend throughs.Slide plate 22 passes through drive unit (for example cylinder (not shown)) at center H ₁(Fig. 4) the position H that drips of Xia Fang a position and wax 4 ₃(Fig. 2) move back and forth between Xia Fang the position.

The center H of adhering device 10 ₁Be the position of centring means 13 with lens blank 1 centering.Center H ₁For the position on the upper surface of loading platform 11, in Fig. 2, described position is positioned at the right side of dripping device 14 and the front of gap setting device 15.Bonding position H ₂Be center H ₁One position of top.At bonding position H ₂The place, lens blank 1 is locked by the sticking department 31A of clamp pin 31 at the peripheral edge 11a of concave surface 1a side (Fig. 5).Bonding position H ₂Be set at center H ₁The top, so that make any type in the various types of lens blanks 1 no matter adopt the peripheral part with different-thickness, lens blank 1 all can be positioned at predetermined height during the peripheral edge 11a of concave surface 1a side is boning.Position H drips ₃Wax 4 is dripped to the position on the concave surface 1a of lens blank 1 for dripping device 14.Position H drips ₃At bonding position H ₂The left side and with bonding position H ₂Has equal height.

Referring to Fig. 3 and Fig. 4, centring means 13 is the geometric center of lens blank 1 is set for and the corresponding to mechanism in the center of loading platform 11 with lens blank 1 centering.Centring means 13 comprises around three clamping components 30 of loading platform 11 configurations and three clamp pins 31 that protrude from each clamping component 30.Fixed axis 34 supportings that the near-end of clamping component 30 is protruded by the upper surface from clamp base 33 are in the axial direction gone up pivot with radially (direction of arrow B and D) in clamp base 33.Clamp pin 31 protrudes from the end of each clamping component 30.Fixed axis 34 protrudes on clamp base 33 in a circumferential direction equidistantly.

All clamp pins 31 have identical length, and sticking department 31A protrudes from the upper end of each clamp pin 31 integratedly, as shown in Figure 5.Each sticking department 31A forms the dish of diameter greater than the clamp pin 31 of correspondence.The lower surface of sticking department 31A forms the limit that receiver lens blank 1 moves up with qualification lens blank 1 on the surface of the peripheral edge 11a of concave surface 1a side.The height of the lower surface of sticking department 31A is corresponding to the bonding position H of lens holding unit 2 bonding lens blanks 1 ₂

Clamp base 33 forms has the cylindrical shape of upper, open end and lower open end, and is horizontally fixed on a plurality of pillars 35 that protrude from the upper surface of slide plate 22.Rotating basis 36 is installed in the clamp base 33 in rotatable mode by bearing 37.Rotating basis 36 has the through hole 38 that forms cylinder and make back shaft 17 extend throughs.When centring means 13 during with lens blank 1 centering, rotating basis 36 is by cylinder 39 predetermined angular that reciprocally pivoted.

The direct-coupled type cylinder is used as cylinder 39.The linear reciprocal movement of the bar 40 of cylinder 39 is converted into arcuate movement.Described arcuate movement is transferred to rotating basis 36 via axle 41.

Three shifting axles 44 protrude from the upper surface of rotating basis 36 in a circumferential direction equidistantly.Each shifting axle 44 is the formed elongated hole 43 in the center of the clamping component 30 of extend through correspondence and protruding upward slidably.During with lens blank 1 centering, when the direction (counterclockwise) of rotating basis 36 by the arrow A of cylinder in Fig. 3 goes up when pivoting, lens blank 1 is by clamp pin 30 place that centers.More specifically, when pivoting on the direction of rotating basis 36 in arrow A, shifting axle 44 is moving in the elongated hole 43 of correspondence on the direction being separated with fixed axis 34, and clamping component 30 fixed axis 34 around conduct pivot center on the direction of arrow B is pivoted.Therefore, clamp pin 31 also pivots on identical direction.When clamping component 30 pivoted predetermined angular, clamp pin 31 near the periphery surface 1c of the lens blank on the loading platform 11 1 to push lens blank 1.When the geometric center of lens blank 1 was eccentric in the center of loading platform 11, lens blank 1 moved and the place that centers on the direction opposite with eccentric direction by three clamp pins 31, makes that the geometric center of lens blank 1 is consistent with the center of loading platform 11.

When the centering EO of lens blank 1, the driving of cylinder 39 operation is converted into rotating basis 36 is pivoted on the direction of arrow C.When rotating on the direction of rotating basis 36 in arrow C, each clamping component 30 is gone up and to be pivoted identical angle and to get back to original position opening direction (direction of arrow D), makes all clamp pins 31 and lens blank 1 be separated.

In addition, three locating pieces 50 are arranged on the upper surface of clamp base 33, and so that each locating piece 50 is positioned between the adjacent clamping component 30 of its front and back, and essence is perpendicular to the clamping component 30 of its back.Each locating piece 50 forms the L shaped to have arm 50A and shank 50B of counter-rotating.Arm 50A extends on the rotating basis 36 to be parallel to described rotating basis and relative with it.Shank 50B is by the upper surface of bolting to clamp base 33.

Place bearing 51 (Fig. 3) between the arm 50A of rotating basis 36 and each locating piece 50 to be connected to the end of each clamping component 30.During the centering, bearing 51 rolls on rotating basis 36, so that arrow B and the pivot direction of D on of corresponding clamping component 30 in Fig. 3 is level and smooth.When lens blank 1 moves up with loading platform 11 and is pushed and when propping up the sticking department 31A of clamp pin 31, bearing 51 is pushed and to prop up the lower surface of arm 50A of locating piece 50 unsettled to prevent clamping component 30.

Referring to Fig. 6, wax 4 is dripped to dripping device 14 on the concave surface 1a of lens blank 1 comprise the container 61 that stores wax 4, with wax 4 drip to nozzle 62 on the lens blank 1, with container 61 be connected to nozzle 62 pipe 63, with every batch of batch form with scheduled volume from container 61 supply off and on the valve 66 that drips of stepping motor 65, the opening/closing nozzle 62 of pump 64, the driving pump 64 of wax 4, respectively heating container 61 and pipe 63 heater 67 and 68, have the cylinder 69 and the similar device of the speed control of handling the valve 66 that drips.

The volume of container 61 is 10.56 liters (440mm width x 240mm degree of depth x 100mm height).The heater 67 of container 61 is 100V and 300W.The heater 68 of pipe 63 is 100V and 17W.Nozzle 62 has the opening that diameter is 3mm.The pin type cylinder of being made by SMC (pin cylinder) (CDJPL10-5D-97LS) is used as the valve 66 that drips of opening/closing nozzle 62.

In the time of in solid-state wax 4 is fills up to container 61, it is heated by heater 67 and melts.Temperature in the container 61 is controlled by temperature controller.Described temperature controller started automatically/cuts out with the default time of time switch.Heater 67 will expend two hours and come by being heated to 70 ℃ of solid state wax 4 fusings that make in the container 61.When using timer to melt wax 4 in advance, when beginning, operation can begin wax 4 fusings are operated and be need not to wait for to the bonding of lens blank 1.

The temperature that makes the dripping device 14 that can use melt is 0 ℃ to 120 ℃, and the melt temperature of wax 4 is suitable for 68 ℃ to 72 ℃.Two temperature are the value of being maintained fixed preferably.When by pump 64 from outlet 70 at every turn with fixed amount off and on during the wax 4 that has melted in the supply container 61, wax is directed to nozzle 62 via pipe 63.

As shown in Figure 7, use the known gears pump of intermeshing two gear 71a and 71b to be used as pump 64.This gear pump 64 is suitable, and this is because it can steadily and reliably supply the wax 4 with viscosity with every batch of batch form with scheduled volume.Control the amount of the wax of supplying by gear pump 64 4 exactly by the quantity that changes the driving signal that will be supplied to stepping motor 65.

Fig. 8 is the curve map of the relation between the amount of dripping that shows the number of pulses will be supplied to stepping motor 65 and wax 4.Present as Fig. 8 is clear, the amount of dripping of wax 4 shows the very high linearity with respect to number of pulses.

In order to control the amount of dripping, do not need tradition bonding ring (the blocking ring) 3 shown in Figure 13 as the wax 4 of a prominent feature realizing dripping device 14.If can't accurately control the amount of dripping, then when the amount of dripping was excessive, wax 4 can overflow from the concave surface 1a of lens blank 1.When the amount of dripping was too small, the chucking power of bonding can reduce.According to the present invention, control opening/closing time of the valve 66 that drips according to lens blank 1, make the amount of dripping that can very accurately control wax 4.The problem that lower bonding chucking power therefore can not occur, and the wax 4 of the optimised quantity that can corresponding various types of lens blanks 1 drips.

Once more referring to Fig. 2 and Fig. 4, vertical mobile lens holding unit 2 is comprising the keeping arm 80 that keeps lens holding unit 2, supporting keeping arm 80 with vertical mobile ball screw 81, stepping motor (not shown) and the similar device that ball screw 81 is rotated at the gap setting device 15 of setting predetermined gap between lens holding unit 2 and the lens blank 1, and described gap setting device is configured in the back of centring means 13.The tip forward of keeping arm 80 is stretched out to be positioned at bonding position H ₂On, and its lower surface place is provided with the vacuum chuck (not shown) that keeps lens holding unit 2 with removably.The center of vacuum chuck is consistent with the center of loading platform 11.During the bonding of lens blank 1, when the rotation of keeping arm 80 by ball screw 81 moved down, lens holding unit 2 was pushed and against the wax 4 that has firmly dripped on the lens blank 1.Therefore, wax 4 spreads to the whole surface of the adhesive surface 2a of lens holding unit 2 thinly, the lens blank 1 thereby scioptics holding unit 2 can bond.

By according to as with reference to the height (bonding position H ₂Height) the lower surface of sticking department 31A of clamp pin 31 number of pulses that is fed to stepping motor accurately control the amount that lens holding unit 2 moves down during boning, wherein lens blank 1 at the peripheral edge 11a of concave surface 1a side near described clamp pin 31.Therefore, between lens blank 1 and lens holding unit 2, set predetermined gap d (Fig. 5), in other words, set the end thickness of wax 4.More specifically, calculate the amount of the dripping Q of gap d and wax 4 from least one among the radius of curvature Ch of the convex surface 2a of the diameter YDh of the thickness YH (among Fig. 1 and Fig. 5, being the thickness of the peripheral part of dish 2A) of the peripheral part of the diameter LDb of the radius of curvature R of the concave surface 1a of the end thickness Te after the distribution, lens blank 1, lens blank 1, lens holding unit 2, lens holding unit 2 and lens holding unit 2 of wax 4 from back side 2b to surperficial 2a.

In the present invention, with regard to the relation of the position during boning between lens holding unit 2 and the lens blank 1, parameter " the end thickness Te of the thickness YH+ wax of the peripheral part of lens holding unit " is limited and is set for 7mm.The thickness YH of the peripheral edge of lens holding unit 2 is configured to 4mm, thereby makes the end thickness Te of wax 4 be configured to 3mm.By following formula from each parameter value calculation particular data that requirement sent according to the known servomechanism (not shown) of supervisory instruction data.

When moving down lens holding unit 2 for the end thickness Te with wax 4 sets predetermined value for when being pressed in wax 4 on the lens blank 1, lens blank 1 is calculated by following formula (1) in the peripheral edge 11a and the gap d of lens holding unit 2 on the vertical direction between the peripheral edge 22a of adhesive surface 2a side (Fig. 5) of concave side:

$d=-\sqrt{R^2-\frac{{\mathrm{<figure-callout\; id="2"\; label="LDb"\; filenames="C200580005343E00291.png"\; state="\{\{state\}\}">LDb</figure-callout>}}^2}{4}}+\sqrt{R^2-\frac{{\mathrm{<figure-callout\; id="2"\; label="YDh"\; filenames="C200580005343E00291.png"\; state="\{\{state\}\}">YDh</figure-callout>}}^2}{4}}\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right)$

Wherein R is the radius of curvature of the concave surface 1a of lens blank 1, and LDb is the diameter of lens blank 1, and YDh is the diameter of lens holding unit 2.

Lens holding unit 2 is positioned in a coordinate position place that is positioned at the plane of reference 2b below of lens holding unit 2 with predetermined value YH (thickness of peripheral part) at the peripheral edge 22a of adhesive surface 2a side coordinate position in vertical direction.Therefore, during boning, the amount of moving down of lens holding unit 2 is controlled so as to the end thickness Te that makes wax 4 and obtains a predetermined value (being 3mm in this embodiment).More specifically, move down lens holding unit 2, so that the plane of reference 2b of lens holding unit 2 is parked in than bonding position H ₂Height (lens blank 1 the peripheral edge 11a of concave side near the height of lower surface of sticking department 31A of clamp pin 31) position of high YH+d.

The amount of the dripping Q that drips to the wax 4 on the lens blank 1 is calculated by following formula (2):

$Q=\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="TeDh"\; filenames="C200580005343E00291.png"\; state="\{\{state\}\}">TeDh</figure-callout>}}^2+\mathrm{\&pi;}[-\frac{1}{3}{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^3+R{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^2]\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right)$

$-\mathrm{\&pi;}[-\frac{1}{3}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^3+\mathrm{Ch}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^2]$

Wherein Te is the end thickness of wax 4, and Ch is the radius of curvature of the adhesive surface 2a of lens holding unit 2, and 2Dh is wax 4 diameters after scattering.

The amount of the dripping Q that drips to the wax 4 on the lens blank 1 can also be calculated by following formula (3):

$Q=\mathrm{\&pi;}(\mathrm{Tc}+\sqrt{R^2-{\mathrm{Dh}}^2}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2}){\mathrm{<figure-callout\; id="2"\; label="Dh"\; filenames="C200580005343E00291.png"\; state="\{\{state\}\}">Dh</figure-callout>}}^2$

$+\mathrm{\&pi;}[-\frac{1}{3}{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^3+R{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^2]\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right)$

$-\mathrm{\&pi;}[-\frac{1}{3}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^3+\mathrm{Ch}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^2]$

Wherein Tc is the central thickness of wax 4 after distribution.

When calculating the amount of the dripping Q of wax 4, controller will send to the stepping motor 65 of the rotation amount that is used for control gear pump 64 corresponding to its pulse of predetermined quantity.

Windows 200 is used as the controller of adhering device 10 therein as the PC of OS operation.According to communication means, the I/O plate links to each other with control centring means 13, dripping device 14 and gap setting device 15 by the ArcNet communication board with motor controller.

Referring to Fig. 3 and Fig. 9 to Figure 12 bonding operation by the 10 pairs of lens blanks 1 of adhering device with said structure is described mainly.

At first, by O type ring 18 pad 19 is placed on (Fig. 3) on the loading platform 11.Lens blank 1 is placed on (Fig. 9) on the pad 19 with its supine concave surface 1a.

The lower surface (Fig. 4) that faces down and be connected to keeping arm 80 ends with its adhesive surface 2a corresponding to the lens holding unit 2 of lens blank 1.

Centring means 13 is with lens blank 1 centering.In centering operation, cylinder 39 is actuated to drive on the direction of the arrow A of rotating basis 36 in Fig. 3 by predetermined angular, so that each clamping component 30 pivots on the closing direction that arrow B indicated.Therefore, each clamp pin 31 towards the central mobile of rotating basis 36 to push the periphery surface 1c of lens blank 1, so that lens blank 1 is moved, thereby make the geometric center consistent with the center of loading platform 11 (Fig. 4) of lens blank 1 on the direction opposite with eccentric direction.

When being used for the centering EO of lens blank 1, lens blank 1 passes through mobile device 12 (Fig. 4) from center H ₁Move to bonding position H ₂More specifically, when mobile device 12 was driven, control stick 26 stretched out upwards to push away back shaft 17 and loading platform 11.Lens blank 1 then along clamp pin 31 from center H ₁Be moved upwards up to bonding position H ₂(Figure 10), and the peripheral edge 11a of concave surface 1a side be pushed and prop up the lower surface of the sticking department 31A of clamp pin 31.Therefore, make lens blank 1 be fixed on bonding position H ₂The place.

Subsequently, slide plate 22 (Fig. 4) moves by the left side of drive unit (for example cylinder) in Fig. 4, so that lens blank 1 is from bonding position H ₂Move to the position H that drips ₃(Fig. 2).When lens blank 1 moves to the position H that drips ₃And when stopping, dripping device 14 drips to the wax 4 of scheduled volume the central authorities of the concave surface 1a of lens blank 1.

With as shown in Figure 6 following manner wax 4 is dripped.Stepping motor 65 is actuated to gear pump 64 is driven predetermined period, so that the wax 4 of scheduled volume is released pipe 63 from container 61.The wax 4 that will rest in pipe 63 ends by promotion pressure drips on the concave surface 1a of lens blank 1 from nozzle 62 with scheduled volume.At this moment, operation is simultaneously dripped valve 66 and gear pump 64 with opening/closing nozzle 62.

When dripping during EO of the wax 4 that is undertaken by dripping device 14, slide plate 22 move so that lens blank 1 from the position H that drips ₃Return bonding position H once more ₂When lens blank 1 turns back to bonding position H ₂The time, start gap setting device 15 so that keep the keeping arm of lens holding unit 2 to move down scheduled volume (Figure 11), prop up the wax 4 that drops on the lens blank 1 with the adhesive surface 2a that promotes lens holding unit 2.Therefore, wax 4 can spread on the whole adhesive surface 2a, thereby has predetermined thickness (Figure 12).In this state, wax 4 is cooled off a predetermined period of time naturally or is forced to be solidified, so that lens blank 1 is by lens holding unit 2 bondings.

Thereafter, each clamping component 30 outwards pivots on the diametric(al) of rotating basis 36 so that each clamp pin 31 is separated with lens blank 1.Keeping arm 80 moves up being back to elemental height, and loading platform 11 moves down to be back to initial center H ₁Thereby, finish the bonding operation of 10 pairs of lens blanks 1 of adhering device.Lens blank 1 by lens holding unit 2 bondings has been placed on the loading platform 11.

Mode according to this, according to the present invention, the amount of the dripping Q of wax 4 suitably is controlled, and the amount of moving down of lens holding unit 2 is controlled, and makes to form predetermined gap d between the concave surface 1a of lens blank 1 and the lens holding unit 2.The amount of the dripping Q of wax 4 will can be not excessive or too small, makes wax 4 scioptics holding units 2 can scatter into predetermined thickness.

According to the present invention, during boning, lens blank 1 is from center H ₁Move up and move to bonding position H then ₂No matter any type of having in various types of lens blanks 1 of peripheral part of different-thickness of employing all can place bonding position H with its concave surface 1a reliably ₂The place.

According to the present invention, centring means 13 is for to have the easy configuration of a few components, thereby it can be created with low cost.

According to the present invention, loading platform 11 is by pendulous device 20 swinging mountings.Even when adopting the lens blank with peripheral part that thickness changes in a circumferential direction, its concave surface 1a also can remain under the level.During dripping wax 4, wax 4 will can not overflow from concave surface 1a, thereby can bond lens blank 1 reliably.

According to the present invention, because can very accurately control the amount of dripping of wax 4, so wax 4 will can not overflow from the concave surface 1a of lens blank 3.Therefore, do not need the tradition bonding ring 3 shown in Figure 13, thereby can reduce the required number of elements of bonding.

Adopt polyvinyl wax in the above-described embodiment.Any other wax (for example, alkyl wax, crystallite base wax, Fischer-Tropsch wax (Fischer-Tropsh-based wax) or fat and oil base synthetic wax) all can be used as adhesive of the present invention, as long as it at room temperature is fused into the liquid with relatively low viscosity for solid and when heating.Be not only wax, but also can adopt low-melting alloy.

The invention is not restricted to the embodiments described, but can do various changes and modification.

Industrial usability

Although illustrated the present invention is used for adhered plastics lens (plastic spectacle lens) A kind of situation, yet the invention is not restricted to this, and can be applied to various types of optical lenses.

Claims (10)

1. device that is used for blocking optical lens, described device comprise by adhesive has the lens of optical lens to keep instrument, it is characterized in that, comprising:

Loading platform, optical lens face up with its concave surface and are placed on the described loading platform;

Centring means, described centring means make the geometric center of optical lens consistent with the center of described loading platform;

With the dripping device of drops of adhesive to the concave surface of optical lens; And

Mobile device, described mobile device moves to the bonding position place that described lens keep instrument with optical lens, wherein

Described centring means comprises a plurality of pins, and described pin radially with on the circumferencial direction moves and push the periphery surface of optical lens described loading platform,

The upper end of each in the described pin comprises sticking department, and described sticking department is used to lock the peripheral edge of optical lens in concave side.

2. the device that is used for blocking optical lens according to claim 1 is characterized in that, described centring means comprises:

Clamp base around described loading platform;

Be installed in rotating basis in the described clamp base in rotatable mode;

The drive unit that described rotating basis is pivoted;

The a plurality of fixed axis that on described clamp base, protrude;

Respectively by a plurality of clamping components of described fixed axis can the pivot mode to support;

A plurality of shifting axles, described shifting axle on described rotating basis, protrude and the described clamping component of extend through in each elongated hole, and described clamping component is pivoted during the centering of optical lens respectively towards described loading platform; And

A plurality of pins, described pin respectively protrude on the described clamping component and feeling relieved during push the periphery surface of optical lens.

3. the device that is used for blocking optical lens according to claim 1 is characterized in that,

Described loading platform is supported in the swing mode by supporting arrangement, and

Described mobile device moves up described loading platform with the optical lens that moves up along described pin, thereby optical lens is moved to bonding position.

4. the device that is used for blocking optical lens according to claim 1, it is characterized in that, further comprise gap setting device, described gap setting device moves described lens and keeps instrument and optical lens to set predetermined gap betwixt on close toward each other direction, come so that adhesive scatters.

5. the device that is used for blocking optical lens according to claim 4, it is characterized in that, keep the diameter of instrument, the radius of curvature of adhesive surface, the diameter of optical lens, the radius of curvature of concave surface and at least one the gap between described lens maintenance instrument and the optical lens to calculate the amount of dripping that drips to the adhesive on the optical lens by described dripping device from the thickness of the form peripheral edge portions of adhesive after distribution, described lens.

6. the device that is used for blocking optical lens according to claim 4 is characterized in that, described lens keep the peripheral part and the gap d of optical lens on the vertical direction between the peripheral part of concave side of the adhesive surface of instrument to be calculated by following formula:

$d=-\sqrt{R^2-\frac{{\mathrm{LDb}}^2}{4}}+\sqrt{R^2-\frac{{\mathrm{YDh}}^2}{4}}$

Wherein R is the radius of curvature of the concave surface of optical lens, and LDb is the diameter of optical lens, and YDh is the diameter that described lens keep instrument.

7. the device that is used for blocking optical lens according to claim 4 is characterized in that, the amount of the dripping Q of adhesive is calculated by following formula:

$Q=\mathrm{\&pi;TeD}{h}^2+[-\frac{1}{3}{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^3+R{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^2]$

$-\mathrm{\&pi;}[-\frac{1}{3}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^3+\mathrm{Ch}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^2]$

Wherein Te is the thickness of the peripheral part of adhesive after distribution, and Ch is the radius of curvature that described lens keep the adhesive surface of instrument, and R is the radius of curvature of the concave surface of optical lens, and 2Dh is the diameter of adhesive after distribution.

8. the device that is used for blocking optical lens according to claim 4 is characterized in that, the amount of dripping of adhesive is calculated by following formula:

$Q=\mathrm{\&pi;}(\mathrm{Tc}+\sqrt{R^2-{\mathrm{Dh}}^2}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2}){\mathrm{Dh}}^2$

$+\mathrm{\&pi;}[-\frac{1}{3}{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^3+R{(R-\sqrt{R^2-{\mathrm{Dh}}^2})}^2]$

$-\mathrm{\&pi;}[-\frac{1}{3}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^3+\mathrm{Ch}{(\mathrm{Ch}-\sqrt{{\mathrm{Ch}}^2-{\mathrm{Dh}}^2})}^2]$

Wherein Tc is the central thickness of adhesive after distribution, and 2Dh is the diameter of adhesive after distribution, and Ch is the radius of curvature that described lens keep the adhesive surface of instrument, and R is the radius of curvature of the concave surface of optical lens.

9. the device that is used for blocking optical lens according to claim 1, it is characterized in that described dripping device comprises the gear pump of supplying adhesive, drives the drive unit of described gear pump and drops of adhesive that described gear pump the is supplied nozzle to the concave surface of optical lens off and on.

10. method that is used for blocking optical lens, described method is used the described adhering device blocking optical lens of claim 1, it is characterized in that included step is:

With drops of adhesive to the concave surface of optical lens;

Promote described lens keep instrument against living the adhesive on the optical lens so that adhesive scatters comes, so that described lens keep instrument and optical tooling to keep predetermined gap; And

Cool off adhesive and it is solidified, so that described lens keep instrument and optical lens to be bonded into one.

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