JPH0957777A - Die centering device of optical element forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it accurately adjustable to tilt the optical forming plane of a molding die by freely inching the axial core of a molding die in the rolling of an X-X axis and the pitching of a Y-Y axis over the forced adjustment of a shear in the mutual central axes of the die. SOLUTION: In the die centering device of an optical element forming device which forms under pressure an optical raw material thermally softened, a positioning pin 2 is installed at four spots on an X-X axis and a Y-Y axis which cross-intersect each other at the center of a tilting base 14 as a molding die mounting member, and guides 24 for pressing the positioning pins 23 at the four spots from one side respectively, are provided so that the tilting base 14 is not rotated on the cross intersection face. At the same time, the positioning pins 23 can be slided vertically along the guides 24. In addition, the X-X axis and the Y-Y axis are rotatable as the rotary axes and a metallic tilt fastened to the tilting base 14 are also adjustable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die centering device for an optical element forming apparatus for centering a die or a die mounting portion with high accuracy in an optical element forming apparatus for press-molding an optical material softened by heating. .

[0002]

2. Description of the Related Art Conventionally, as an apparatus for centering a die or a die mounting portion with high accuracy in an optical element molding apparatus for press-molding an optical material that has been softened by heating, Japanese Patent Publication No.
It is disclosed in Japanese Patent No. 11565. Since the device is configured to centripetally hold a pair of dies, as shown in FIGS. 22 to 24, the plunger head 1a to which the plunger 1 is fixed is provided with guide bars 4 at four crosses. . On the other hand, a guide bar 5 is provided on the bottom 3 arranged to face the plunger head portion 1a, similarly to the plunger head portion 1a. Further, in the shell ring 2 arranged between the plunger head portion 1a and the bottom 3,
A guide plate 6 is provided. The positional relationship between the guide bar 4 and the guide plate 6 is, as shown in FIG. 23, the guide bar 4 in the first quadrant and the third quadrant facing the first quadrant.
Only the guide plate 6 is arranged in the second quadrant and the fourth quadrant opposite to the second quadrant, and the guide plate 6 is orthogonal to the horizontal plane.
The guide bar 4 and the guide plate 6 are in surface contact with each other on a vertical plane passing through the axis and the Y-Y axis. On the other hand, the guide bar 5 and the guide plate 6 have the same positional relationship. The guide bar 4 or the guide bar 5 and the guide plate 6 are slidably aligned with each other as shown in FIG.

In operation, an optical material heated and softened by an optical material heating device (not shown) is supplied to the inner surface of the bottom 3 by a supply device, the guide plate 6 is fitted to the guide bar 5, and the shell ring 2 is fitted. Next, the guide bar 4 is aligned with the guide plate 6, and the plunger head portion 1a is fitted.
Then, the back surface of the plunger head portion 1a is pressed by a presser (not shown). That is, the optical material is press-molded in the cavity formed by the plunger 1, the shell ring 2 and the bottom 3. When the plunger 1, the shell ring 2 and the bottom 3 are fitted and combined together, the guide bar 4 (or the guide bar 5) in the first quadrant and the third quadrant facing the first quadrant is in the second quadrant and the fourth quadrant facing it. The guide plates 6 are pressed, respectively, whereby the plunger head portion 1a, the shell ring 2 and the bottom 3 are forcibly exerted on each other, and the mold center axes of the plunger 1, the shell ring 2 and the bottom 3 are displaced for convenience. Relentlessly.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 56-1156
The device described in Japanese Patent No. 5 has the following drawbacks. The guide bar 4 of the plunger head portion 1a or the guide bar 5 of the bottom 3 is in surface contact with the guide plate 6 of the shell ring 2, so that not only the mutual deviation of the mold center axes but also the XX axis Force rolling and pitching on the Y-Y axis. By the way, in the optical element molding, the XY axis rolling and the YY axis pitching are finely moved while forcing the mutual deviation of the mold center axes to precisely adjust the tilt of the optical molding surface. Although it is necessary, in the prior art, the disadvantages of rolling on the XX axis and pitching on the YY axis occur. That is, there is a drawback that the tilt of the optical molding surface cannot be adjusted.

The present invention has been made in view of the above problems in the prior art, and the inventions of claims 1 to 3 are free to move the mold shafts freely while the displacement of the mold center axes from each other is forced. It is an object of the present invention to provide a die centering device of an optical element forming device capable of precisely adjusting the tilt of the optical forming surface of the die by finely moving the rolling and the Y-Y axis pitching.

[0006]

In order to solve the above-mentioned problems, the present invention has the following constitution. According to a first aspect of the present invention, in a mold centripetal device of an optical element molding device that press-molds an optical material that has been softened by heating, a positioning member is provided at four substantially crossing positions of a mold or a mold mounting member, A guide member is provided that presses each of the four positioning members from one side so that the mold or the mold mounting member does not rotate on the substantially cross-shaped surface, and the positioning member is slidable up and down along the guide member. In addition, each of the cross shafts is used as a rotation shaft so as to be rotatable.

According to a second aspect of the present invention, the four positioning members in the first aspect are rotating bodies, and the rotation axes thereof intersect at a right angle with a cross.

According to a third aspect of the present invention, the four positioning members and the guide members in the first aspect are in line contact or point contact, respectively, and the lines connecting the opposing lines or points intersect at a right angle to the cross. .

According to the first aspect of the present invention, the positioning members provided at the four substantially cross-shaped cross sections of the mold or the die mounting member are pressed by the respective guide members so as not to rotate with each other, so that the cross-shaped cross sections are substantially crossed. The centering point is centered on the intersection of the axes, while the positioning member rotates about the cross axis as a rotation axis and slides along the guide member so that the die (generally cross axis) can be freely rolled and Pitching is to precisely adjust the tilt of the optical molding surface of the mold.

According to the second aspect of the present invention, since the positioning member is a rotating body, the rolling and pitching of the die causes
Even if the positioning member slides or rotates along the guide member, the horizontal distance between the rotation axis of the positioning member, that is, the cross axis, and the contact surface of the guide member is always constant.

According to the third aspect of the present invention, the positioning member and the guide member are in line contact or point contact, and the line or point is substantially coincident with the cross axis. Therefore, even if the die rolls and pitches, the positioning member is in position. And the contact portion of the guide member, that is, the cross shaft, slides and rotates while constantly contacting the guide member contact surface.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment of the Invention] A first embodiment of a die centering apparatus for an optical element molding apparatus according to the present invention will be described below with reference to FIGS. 1 to 7. A molding chamber wall 11 is fixed on the lower base 10 so as to surround a mold composed of an upper mold 17 and a lower mold 18. An optical material is carried into one side of the molding chamber wall 11 and pressure-molded. A molding chamber carry-in / out port 11a for carrying out the optical element is formed. An upper base 12 is fixed on the molding chamber wall 11, and a shift base 13 capable of horizontally shifting on the upper surface of the upper base 12 is placed on the upper base 12. The shift base 13 can be fixedly fastened to the upper base 12 by a fixing bolt 21 or can be freely released, and can be horizontally shifted by a play amount of a through hole of the fixing bolt 21.

The shift base 13 is provided with a tilt base 14 having a T-shaped cross section, which comprises a shaft portion 14a and a brim portion 14b. The tilt base 14 is arranged so that the shaft portion 14a penetrates the shift base 13 and the holes 13a and 12a of the upper base 12, and the lower surface of the brim portion 14b faces the upper surface of the shift base 13, and is fixed. The bolt 25 allows the shift base 13 to be fastened and fixed or released freely. further,
The tilt base 1 is attached to the brim portion 14 b of the tilt base 14.
Four adjusting screws 22 are provided on the X-X axis and the Y-Y axis which intersect at a right angle with a cross at the center of 4. Adjustment screw 2
2 is in a state in which the shift base 13 is stretched by being screwed from the upper surface of the tilt base 14 so that the tip portion thereof abuts the upper surface of the shift base 13. Further, a cylindrical positioning pin 23 is attached to the outer peripheral side surface of the flange portion 14b of the tilt base 14, and the central axis of the positioning pin 23 is aligned with the XX axis and the YY axis, respectively. And four are provided. On the other hand, on the shift base 13, there is provided a guide 24 having a vertical surface at a position separated from the tilt base 14 by the distance of the radius of the positioning pin 23 from the X-X axis and the Y-Y axis of the tilt base 14. Four pins are fixed so as to face each other with a shaft in between, and the outer peripheral surface of the positioning pin 23 is a vertical surface of the guide 24 in the directions from the first quadrant and the third quadrant to the second quadrant and the fourth quadrant. It is pressed and regulates the rotation of the tilt base 14.

Tilt base 14 which is a die mounting member
On the lower surface of the shaft portion 14a of the
Is provided on the outer periphery, and an upper mold 17 having an optical molding surface is fixed. On the other hand, the lower mold 18 facing the upper mold 17 is fixed to a movable shaft 15 which can be precisely moved up and down through a heat insulating member 16 so as to be able to approach and separate from the upper mold 17, Similarly to 17, it has an optical molding surface, and a lower heater 20 whose temperature can be adjusted is provided on the outer circumference.

The operation of the mold centripetal device of the optical element molding apparatus having the above construction will be described. The optical element is molded as follows. The upper mold 17 and the lower mold 18 are heated and adjusted by the upper heater 19 and the lower heater 20, respectively, to the required temperatures required for optical element molding. Further, at this time, the molding chamber wall 11 prevents a sudden temperature change of the atmosphere. On the other hand, the optical material heated and softened by an optical element heating device (not shown) is supplied between the upper mold 17 and the lower mold 18 from the molding chamber carry-in / out port 11a by a supply device (not shown). Then, the heat-softened optical material is moved up the movable shaft 15 by a driving device (not shown) to move the upper mold 17
And the lower mold 18 are press-molded.

When adjusting the mold, the mold axis Z of the lower mold 18
The shift and tilt of the upper mold 17 are adjusted as described below with reference to (the central axis of the lower mold 18). For shift adjustment, the fixing bolt 21 is loosened to release the fastening between the upper base 12 and the shift base 13. In that state, the shift base 13 is moved in the horizontal direction of the X-X axis and the Y-Y axis using a precise moving tool to perform shift adjustment. That is,
The shift of the upper die 17 fixed to the shift base 13 via the tilt base 14 is adjusted. After the adjustment, the fixing bolt 21 is tightened to firmly fasten and fix the upper base 12 and the shift base 13.

When adjusting the tilt, the fixing bolt 25 is loosened to release the fastening between the shift base 13 and the tilt base 14. In this state, the adjusting screws 22 provided at four locations are tightened or loosened to adjust the height at which the adjusting screw 22 stretches the shift base 13. As a result, the height at which each adjustment screw 22 lifts the tilt base 14 changes, so that tilt adjustment of the tilt base 14 can be performed. That is, the tilt of the upper mold 17 fixed to the tilt base 14 is adjusted. For convenience, the positioning pin 23 is raised and lowered by the tilting operation of the tilt base 14 associated with the adjustment. At this time, as shown in FIG. 4, when the positioning pin 23 at one place is raised, the positioning pin 23 orthogonal to it is rotated. However, as shown in FIGS. 4 to 7, the four positioning pins 23 and the guides 24 press each other so that the tilt base 14 does not rotate in a substantially horizontal plane.
The outer peripheral surface of the positioning pin 23 and the vertical surface of the guide 24 are always in contact with each other, and moreover, the center of rotation of the positioning pin 23 is common to the X-X axis and the Y-Y axis intersecting with a cross. As a result, the positioning is performed as shown in FIG. Even if the pin 23 moves up and down by h or rotates by θ as shown in FIG. 6, the XX axis and Y
Each -Y axis only moves in a constant vertical plane.
Therefore, as shown in FIG.
The intersection O of the XX axis and the YY axis is located on the line of intersection of the vertical planes traced by the XX axis and the YY axis, that is, the ZZ axis, regardless of the vertical direction. That is, the intersection of the XX axis and the YY axis of the tilt base 14 is XX.
Z- regardless of axis rolling or Y-Y axis pitching
The tilt base 14 is centered on the Z axis, and yawing on the ZZ axis is suppressed by the mutual pressing of the guides 24, so that the tilt base 14 does not rotate. After the adjustment, the fixing bolt 25 is tightened to firmly fasten and fix the shift base 13 and the tilt base 14.

As described above, according to the present embodiment, the tilt base 14 at the time of adjustment is provided with the positioning pin 23 and the guide 2.
If tilt adjustment is performed while positioning at 4, the X-X axis will be affected regardless of the rolling of the X-X axis and the pitching of the Y-Y axis.
The intersection of the axis and the YY axis, that is, the center of the tilt base 14 is always centered on the ZZ axis. Therefore, it is possible to freely roll the XX axis while forcing the deviation of the center axis of the mold, and
This is convenient for adjusting the mold for optical element molding that requires fine adjustment of the pitch of the shaft to precisely adjust the tilt. Conventionally,
Since it was not possible to easily set the behavior reference point of the mold, the tilt adjustment and the shift adjustment were sometimes repeated, but the intersection O of the XX axis and the YY axis was changed to the behavior of the mold. Since it can be used as the reference point, the adjustment can be surely completed by performing the shift adjustment after the tilt adjustment, or the shift deviation due to the tilt adjustment can be mathematically predicted based on the intersection point O and the tilt and the shift can be adjusted at the same time. It is also possible to do. Therefore, it is possible to significantly shorten the time for adjusting the axis of the mold and accurately perform the adjustment. In addition, since the positioning pin 23 is pressed by the guide 24 from one side, it is not necessary to make an insertion gap for the holding portion as compared with a structure in which the positioning pin 23 is held by both sides, and accordingly, there is no play and a precise amount. Centering can be realized, which is more convenient for precise optical element molding. Further, the thermal expansion of the tilt base 14 caused by the high temperature at the time of molding the optical element also causes the XX axis and the YY.
Since it is released in the axial direction of the shaft, it has no effect on the centripetal action, so good mold adjustment is possible regardless of the temperature, and the deviation after adjustment is small.

In the present embodiment, the case where the upper die 17 and the tilt base 14, that is, the die and the die mounting member are separate bodies is illustrated, but a die in which both are integrated may be used. It is possible to obtain the same effect as that of the present embodiment and to obtain the same effect. .

[Second Embodiment of the Invention] A second embodiment of the mold centripetal device of the optical element molding apparatus according to the present invention will be described below with reference to FIGS. 8 to 14. As shown in FIG. 8 to FIG.
A triangular prism-shaped positioning edge 33 is provided at a position so that the edge has an edge portion on the XX axis or the YY axis orthogonal to the cross.
Is provided. On the other hand, on the shift base 13, guides 24 having vertical planes on the X-X axis and the Y-Y axis of the tilt base 14 are alternately arranged so as to face each other across the X-X axis and the Y-Y axis. The four fixed edge portions of the triangular prism positioning edge 33 are pressed by the vertical surface of the guide 24 from the first quadrant and the third quadrant to the second quadrant and the fourth quadrant, and the tilt base 14 is pressed. The rotation of is regulated. Since other configurations are the same as those in the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

The operation of the mold centripetal device of the optical element molding apparatus having the above configuration will be described. The optical element molding and the shift adjustment of the upper die at the time of adjusting the die are the same as those in the first embodiment, and therefore the description thereof is omitted.

When adjusting the tilt, the fixing bolt 25 is loosened to release the fastening between the shift base 13 and the tilt base 14. In this state, the adjusting screws 22 provided at four locations are tightened or loosened to adjust the height at which the adjusting screw 22 stretches the shift base 13. As a result, the height at which each adjustment screw 22 lifts the tilt base 14 changes, so that tilt adjustment of the tilt base 14 can be performed. That is, the tilt of the upper mold 17 fixed to the tilt base 14 is adjusted. For convenience, the tilting operation of the tilt base 14 associated with the adjustment raises and lowers the positioning edge 33. At this time, as shown in FIG. 11, when one positioning edge 33 is raised, the positioning edge 33 orthogonal to it is rotated. However, as shown in FIG. 11 to FIG.
Since the positioning edge 33 and the guide 24 at each position are pressed against each other so that the tilt base 14 does not rotate in a substantially horizontal plane, the edge portion of the positioning edge 33 and the guide 2 are positioned.
The vertical plane of 4 is always in contact, and the center of rotation of the positioning edge 33, that is, the edge portion crosses X-X.
Since it is common to the axis and the Y-Y axis, as a result, even if the positioning edge 33 moves up and down by h as shown in FIG. 14 or rotates by θ as shown in FIG. ,
And the Y-Y axes each only move in a constant vertical plane. Therefore, as shown in FIG. 11, the intersection point O of the XX axis and the YY axis is a vertical line traced by the XX axis and the YY axis, respectively, regardless of the position of the positioning edge 33 at one position. It lies on the line where the planes intersect, that is, on the ZZ axis. That is, the intersection O between the XX axis and the YY axis of the tilt base 14 is centered on the ZZ axis regardless of the rolling of the XX axis and the pitching of the YY axis. Is suppressed by mutual pressing of the guides 24, and the tilt base 14 does not rotate. After the adjustment, tighten the fixing bolts 25 to shift the shift base 13 and the tilt base 14.
Tightly fasten and fix.

As described above, according to the present embodiment, the tilt base 14 at the time of adjustment is positioned by the positioning edge 33 and the guide 2.
If tilt adjustment is performed while positioning at 4, the X-X axis will be affected regardless of the rolling of the X-X axis and the pitching of the Y-Y axis.
The intersection O of the axis and the Y-Y axis, that is, the center of the tilt base 14 is always centered on the Z-Z axis, and the same effect as that of the first embodiment can be obtained. In addition to this, the guide 24
Even when the positioning edge 33 and the positioning edge 33 thermally expand at a high temperature during molding, not only the thermal expansion is released in the axial direction of the XX axis and the YY axis, but also the guide 24 and the positioning edge 33.
Also expands starting from the XX axis or the YY axis,
As compared with the first embodiment, the deviation of the mold adjustment due to the influence of heat is smaller, and precise molding can be performed.

[Third Embodiment of the Invention] A third embodiment of the die centering apparatus of the optical element molding apparatus according to the present invention will be described below with reference to FIGS. The tilt base 14 has four axes on the XX axis and the YY axis which intersect each other at a right angle.
The book adjusting screw 22 is screwed from the upper surface of the collar portion 14b,
The tip of the adjusting screw 22 is brought into contact with the upper surface of the shift base 13 to stretch the shift base 13. Also,
On the outer peripheral side surface of the brim portion 14b of the tilt base 14, X-
Four columnar positioning pins 43, whose X-axis or Y-Y-axis and their central axes coincide, are attached. As shown in FIG. 18, the positioning pin 43 is a vertical surface of the guide block small bending portion 44b of the four guide blocks 44 fixed to the shift base 13, and is located in the first quadrant and the third quadrant to the second quadrant, respectively. It is pushed horizontally in the direction of the four quadrants, and is pushed vertically downward by the large deflection portion 44a of the guide block. The guide block 44 is a wire cut made of an elastic material, and has a large bending portion 44a that is a U-shaped large bending portion having a small bending cross section and a small bending portion that is a U-shaped small bending portion that has a large bending cross section. Four
4b is formed by an integrally formed member. Since other configurations are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

The operation of the mold centripetal device of the optical element molding apparatus having the above-described structure will be described. The optical element molding and the shift adjustment of the upper die at the time of adjusting the die are the same as those in the first embodiment, and therefore the description thereof is omitted.

When adjusting the tilt, the fixing bolt 25 is loosened to release the fastening between the shift base 13 and the tilt base 14. In this state, the adjusting screws 22 provided at four locations are tightened or loosened to adjust the height at which each adjusting screw 22 stretches the shift base 13. As a result, the height at which the adjusting screw 22 lifts the tilt base 14 is changed, so that the tilt of the tilt base 14 can be adjusted. That is, the tilt of the upper mold 17 fixed to the tilt base 14 is adjusted. For convenience, the positioning pin 43 is raised and lowered by the tilting operation of the tilt base 14 associated with the adjustment. At this time, as shown in FIG. 18, when the positioning pin 43 at one position is raised, the positioning pin 43 orthogonal to it is rotated. However, as shown in FIGS. 19 to 21, the four positioning pins 43 and the small guide block bending portions 44b are
Since the tilt bases 14 are pressed against each other so as not to rotate in a substantially horizontal plane, the positioning pin 43 and the guide block small bending portion 44b are always in contact with each other, and the rotation center of the positioning pin 43 crosses XX. Axis, and Y-
Since it is common to the Y axis, as a result, even if the positioning pin 43 moves up and down by h as shown in FIG. 21 or rotates by θ as shown in FIG. 20, the XX axis and the YY axis are Each of them only moves on a certain vertical plane. Therefore, FIG.
As shown in FIG. 8, the intersection O of the XX axis and the YY axis is the XX axis, regardless of the position of the positioning pin 43 at one position.
And intersecting lines of vertical planes traced by the Y-Y axes,
That is, it is on the ZZ axis. That is, the intersection of the X-X axis and the Y-Y axis of the tilt base 14 is centered on the Z-Z axis regardless of the rolling of the X-X axis and the pitching of the Y-Y axis. Yawing is suppressed by mutual pressing of the guide block small bending portions 44b, and the tilt base 14 does not rotate. Fixing bolt 25 after adjustment
And the shift base 13 and the tilt base 14 are firmly fastened and fixed.

As described above, according to this embodiment, if tilt adjustment is performed while positioning the tilt base 14 at the time of adjustment by the positioning pin 44 and the guide block 44, X-
Regardless of X-axis rolling or Y-Y axis pitching,
The intersection O of the X-X axis and the Y-Y axis, that is, the tilt base 14
Is always centered on the Z-Z axis, and
The same effect as can be obtained. In addition to this, since the positioning pin 43 constantly receives a residual pressure downward by the large bending portion 44a of the guide block, even if the fixing bolt 25 is loosened at the time of tilt adjustment, even if the fixing bolt 25 is loosened, The intersection O does not move carelessly on the ZZ axis. In addition, due to the convenience of processing and assembly, the positioning pin must be completely XX axis or Y-
Although it is difficult to match the position on the Y axis, the guide block small bending portion 44b flexibly absorbs the processing and assembly error, so that the centripetal action does not become uncomfortable. Regarding the flexure of the guide block small flexure portion 44b, since the flexure reproducibility is good, the centripetal accuracy is not deteriorated, and the adjustment work can be performed better than in the first and second embodiments.

[0028]

As described above, according to the present invention, the following effects can be obtained. According to the invention of claims 1 to 3,
When adjusting the mold axis tilt of the optical element molding device, even if the mold or the mold mounting portion is rolled or pitched, the intersection point of the X axis and the Y axis determined by the arbitrary configuration is centered on the Z axis. It is possible to easily and precisely perform the work that has conventionally been difficult to perform precise adjustment because the behavior reference point of the mold is not fixed. Therefore, the time for mold adjustment work is significantly shortened, and it is possible to aim for adjustment accuracy and resolution, which were extremely difficult in the past, and high-quality optical elements with good eccentricity between the two surfaces can be mass-produced. I chose

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line XX in FIG.

FIG. 3 is a perspective view showing a partially cutaway view of the device according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a positioning pin and a guide in the device according to the first embodiment of the present invention.

FIG. 5 is an enlarged side view showing a positioning pin and a guide in the device according to the first embodiment of the present invention.

FIG. 6 is an enlarged side view showing a positioning pin and a guide during tilt adjustment in the device according to the first embodiment of the present invention.

FIG. 7 is an enlarged side view showing a positioning pin and a guide during tilt adjustment in the device according to the first embodiment of the present invention.

FIG. 8 is a plan view showing an apparatus according to Embodiment 2 of the present invention.

9 is a sectional view taken along the line XX in FIG.

FIG. 10 is a perspective view showing a partially cutaway view of the device according to the second embodiment of the present invention.

FIG. 11 is a perspective view showing a positioning edge and a guide in the device according to the second embodiment of the present invention.

FIG. 12 is an enlarged side view showing a positioning edge and a guide in the device according to the second embodiment of the present invention.

FIG. 13 is an enlarged side view showing a positioning edge and a guide during tilt adjustment in the device according to the second embodiment of the present invention.

FIG. 14 is an enlarged side view showing a positioning edge and a guide during tilt adjustment in the device according to the second embodiment of the present invention.

FIG. 15 is a plan view showing an apparatus according to a third embodiment of the present invention.

16 is a sectional view taken along the line X-X in FIG.

FIG. 17 is a perspective view showing a partially cutaway view of the device according to the third embodiment of the present invention.

FIG. 18 is a perspective view showing a positioning pin and a guide block in the device according to the third embodiment of the present invention.

FIG. 19 is an enlarged side view showing a positioning pin and a guide block in the device according to the third embodiment of the present invention.

FIG. 20 is an enlarged side view showing a positioning pin and a guide block during tilt adjustment in the device according to the third embodiment of the present invention.

FIG. 21 is an enlarged side view showing a positioning pin and a guide block during tilt adjustment in the device according to the third embodiment of the present invention.

FIG. 22 is a cross-sectional view showing a conventional technique.

FIG. 23 is a plan view showing a guide unit according to a conventional technique.

FIG. 24 is an enlarged side view showing a guide portion according to the related art.

[Explanation of symbols]

 10 Lower Base 11 Molding Chamber Wall 12 Upper Base 13 Shift Base 14 Tilt Base 17 Upper Mold 18 Lower Mold 21 Fixing Bolt 22 Adjusting Screw 23 Positioning Pin 24 Guide 25 Fixing Bolt 33 Positioning Edge 44 Guide Block 44a Guide Block Large Deflection 44b Guide Block small flexure

Claims (3)

[Claims] 1. A mold centripetal device of an optical element molding device for press-molding a heat-softened optical material with a mold, wherein positioning members are provided at four substantially crossing positions of a mold or a mold mounting member, and the mold or A guide member is provided that presses each of the four positioning members from one side so that the mold mounting member does not rotate on the substantially cross-shaped surface, and the positioning member is slidable vertically along the guide member, and A mold centripetal device for an optical element molding device, wherein each of the cruciform crossing shafts is made to be a rotation shaft so as to be rotatable. 2. The positioning members at the four positions are rotating bodies,
The mold centripetal device of the optical element molding apparatus according to claim 1, wherein the rotation axes intersect at a right angle with a cross. 3. The positioning member and the guide member at the four locations are in line contact or point contact, respectively, and the lines connecting the opposing lines or points intersect at a right angle to a cross. A mold centripetal device of the optical element molding device described.