JPH08119640A - Forming of glass lens and forming device therefor - Google Patents

Abstract

PURPOSE: To provide a forming method for a glass lens capable of continuously producing formed glass lenses having stable quality by stabilizing the height position of a transporting tray during a holding operation for forming and at the time of forming and maintaining the uniform degree of freedom in flow of the excess glass projecting at the time of forming a glass blank and uniformizing thermal influence that the glass blank receives from the transporting tray. CONSTITUTION: The transporting tray 4 for transporting the glass blank 3 softened by heating of the forming device for the glass lenses which softens the glass blank 3 by heating and holds and forms the glass blank by a pair of upper and lower dies 1, 2 is elastically held between the dies 1 and 2 and is then stopped at the height position of the transporting tray 4 moved by the forming and holding operation by providing this height position with the threshold value by a positioning member 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass lens forming method and a glass lens forming method for obtaining a glass lens shape by heating and softening a glass material and then sandwiching and forming it with a pair of upper and lower forming dies.

[0002]

[Prior art]

(Prior Art of Claim 1) As disclosed in Japanese Examined Patent Publication No. 4-43853, in the conventional molding method, after the glass material is heated and softened on the carrying plate, the carrying plate is elastically held between the molds. It is held and held by a pair of upper and lower molds, but the height of the transfer tray that moves by the molding clamping operation relative to the molding surface of the mold is not regulated, and the position of the transfer tray is elastic. There was no particular control other than force.

(Prior Art of Claim 2) Japanese Patent Publication No. 4-438
As disclosed in Japanese Patent Laid-Open No. 53-53, in a conventional molding apparatus, a carrier plate is held on the outer periphery of a mold by elastically holding a carrier plate of a glass material through an elastic member. However, a mechanism for positioning the moving positions of the transport tray and the holding member in the height direction is not provided.

[0004]

According to the prior art, there are the following problems. It will be described with reference to FIG.

(Problem Corresponding to Claim 1) In the above molding method, since the positions in the height direction of the glass material 3 and the conveying tray 4 after the heating and softening are only elastically held, during the molding pinching operation and At the time of molding, the position of the transport tray 4 changes for each molding. Therefore, glass material 3
The degree of freedom of flow of the pad 6 protruding during the molding of the glass fluctuates, and the thermal influence of the glass material 3 from the conveying tray 4 fluctuates, so that a stable glass molding lens cannot be obtained continuously. There was a problem.

(Problem Corresponding to Claim 2) In the above molding apparatus, the glass material 3 and the transfer tray 4 which have been elastically heated and softened by the spring 5 which is an elastic member on the outer periphery of the mold 2 and the mold 1 are used. Although the carrying tray 4 is held by including the holding member 7 for holding the carrying tray 7, the mechanism for positioning the movement limit position of the carrying tray 4 and the holding member 7 in the height direction is not provided. Therefore, the height position of the conveying tray 4 relative to the molding surface of the mold 2 is corrected by the spring 5 during the molding sandwiching operation and during the molding due to the change in the fusion state between the glass material 3 and the conveying tray 4 which are softened during heating and softening. There were times when I couldn't. That is, since the height position of the carrying tray 4 changes during molding, the degree of freedom of the flow of the pad 6 protruding during molding of the glass material 3 changes, or the glass tray 3 moves from the carrying tray 4 to the glass material 3.
However, there is a problem in that a glass molding lens of stable quality cannot be continuously obtained due to a change in thermal influence of the glass.

(Object of the Invention) The present invention has been made in view of the above conventional problems,

(Object of Claim 1) The height position of the conveying tray is stabilized during the molding sandwiching operation and during the molding, the degree of freedom of flow of the bulge protruding during the molding of the glass material and the heat received by the glass material from the conveying tray. It is an object of the present invention to provide a glass lens molding method capable of obtaining a glass molded lens of uniform quality and continuously obtaining stable glass molded lenses.

(Purpose of claim 2) The height position of the conveying tray with respect to the molding surface of the mold during the molding clamping operation and during the molding regardless of the fluctuation of the fusion state between the glass material softened during heating and softening and the conveying tray. By stabilizing the height position of the conveyor plate during molding, the degree of freedom of flow of the bulge protruding during molding of the glass material and the thermal influence of the glass material from the conveyor plate are made uniform, An object of the present invention is to provide a glass lens molding apparatus that can continuously obtain glass molded lenses of stable quality.

[0010]

The outline of the present invention will be described with reference to FIGS. 1 and 2 which are conceptual views.

(Structure of Claim 1) The glass material 3 is heated and softened in a state where it is placed on the carrying tray 4, and a pair of upper and lower molds 1,
It is elastically held between two by a spring 5. At this time, the heat-softened glass material 3 is not in contact with the pair of upper and lower molds 1 and 2. The positions in the height direction of the transfer tray 4 are fixed to the positions of the molds 1 and 2 with respect to the molding surface by the positioning member 8 during the molding clamping operation by filling the spaces between the molds. Furthermore, the space between the molds is reduced and the molding operation is started. After the molding is completed, the mold is released.

(Structure of Claim 2) There are a pair of molding dies 1 and 2 which are vertically opposed to each other, and a spring 5 is inserted in the outer periphery of one or both of the dies, and a holding member 7 is provided at the end in the die front end direction. Has been inserted. The transport tray 4 on which the glass material 3 that has been heated and softened is placed is transported between the molds, and is elastically held by the holding member 7. At the time of molding, a positioning member 8 is provided on both sides in the upward and downward directions or on one side for positioning in the height direction with respect to the molding surface of the mold of the conveying tray 4.
Fixes the holding member 7 or the transport tray 4.

[0013]

[Action]

(Operation of claim 1) Since the glass material 3 that has been heated and softened together with the conveying tray 4 is elastically held by the springs 5 in the molds 1 and 2, it does not come into contact with either of the molds. Not affected. Next, the spaces between the molds are filled and the molding sandwiching operation is started. On the way, the conveying tray 4 is fixed at a position with respect to the molding surface of the mold 1 or the mold 2 by the positioning member 8, so that either mold is made of the glass material. It is possible to fix the height position with respect to the molding surface of the mold of the transfer tray 4 at the time of molding before the molding is started by contacting with 3. Therefore, since the unstable operation factor of the carrying tray 4 during the molding can be eliminated and the molding can be performed, the degree of freedom of flow of the bulge protruding during the molding of the glass material and the thermal influence of the glass material from the carrying tray on each molding. The glass lens can be uniformly molded, and stable glass lens molding can be continuously performed.

(Operation of Claim 2) After the carrier plate 4 on which the glass material 3 which has been softened by heating is placed, is conveyed between the pair of upper and lower molds 1 and 2, the spring 5 inserted in the outer periphery of the molds 1 and the holding member. It is elastically held by the member 7. The glass material 3 heated and softened by this mechanism does not come into contact with the molds 1 and 2 before molding and is not thermally affected. A mold driving device (not shown) fills the spaces between the molds to start the molding sandwiching operation. On the way, the positioning member 8 fixes the height position of the carrier plate 4 with respect to the molding surface of the mold 1 or the mold 2. After that, by further filling the space between the molds and performing molding, an unstable operation of the transport tray 4 does not occur at the time of molding. 4, the thermal influence of the glass material 3 can be made uniform, and a glass molding lens of stable quality can be continuously obtained.

[0015]

Embodiments of the method for molding an optical element according to the present invention will be described below with reference to the accompanying drawings.

A first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a state of the glass lens molding apparatus during molding.

(Structure) A glass material 3 which has been softened by heating is placed on a carrying tray 4 and carried between a pair of upper and lower molds 1, 2. A stopper 8, a spring 5, and a push-up ring 7 placed on the spring 5 are inserted around the outer periphery of the lower mold 2. The stopper 8 has a cylindrical shape, the outer diameter of which is smaller than the inner diameter of the spring 5, and the inner diameter of the stopper 8 can be inserted into and removed from the tip of the mold 2. The spring 5 is wound in a string shape, the outer circumference of which is smaller than the outer circumference of the push-up ring 7, and the inner diameter of which is larger than the outer diameter of the lower end step portion of the push-up ring 7. The push-up ring 7 has a stepped portion at its upper end so as to be fitted with a stepped portion on the lower surface of the transport tray 4, and has a stepped portion at the lower end as well, which has a diameter such that it can be inserted into the spring 5. . Further, there is a collar portion between the upper and lower step portions, and the outer diameter of the collar portion is made larger than the outer diameter of the spring 5 to transmit the thrusting force of the spring 5 to the transport tray 4. Further, when the transfer tray 4 is compressed downward by pressing the spring 5 so that the lower surface of the glass material 3 placed on the transfer tray 4 is at the height of the tip surface of the mold 2, the stopper 8 is provided. The height is determined by the heights of the transport tray 4 and the push-up ring 7 and processed.

Immediately after carrying the carrying tray 4 (before raising the lower mold 2)
, The spring 5 extends high and the transport tray 4 is placed on the push-up ring 7 in a mating manner as described above. At this time,
Since the spring 5 is inserted and placed on the stepped portion of the mold 2 in a state where the spring 5 is extended, the push-up ring 7 places the transport tray 4 in a raised state, so that the transport tray 4 is placed in a lifted state. The lower surface of the glass material 3 that has been softened by heating does not contact the molding surface of the mold 2. At this time, the stopper 8 is on the stepped portion of the mold 2 and does not contact the push-up ring 7. A mold release unit 1 fixed to a molding machine body (not shown) around the upper mold 1.
1. Make a through hole at one end so that the mold 1 can be inserted,
A long thin plate-shaped pressing spring 9, a plate-shaped spacer 12, and a thick long plate-shaped release arm 10 are screwed at the other end. The presser spring 9 is set so that it can be pressed downward with a force sufficiently stronger than the force of the spring 5 to expand.

The push-up ring 7 and the stopper 8 are mentioned above.
However, in order to obtain the effect of this embodiment even if they are integrated, there is no problem if the above height relationship is observed.

(Function) The glass material 3 which has been heated and softened is placed on the transfer tray 4 and is coaxially transferred between the pair of upper and lower molds 1 and 2.

Next, the lower mold 2 is slightly raised by a mold driving device (not shown) so that the upper surface of the transfer tray 4 does not come into contact with the pressing spring 9 before the sandwich molding, and the transfer tray 4 has the spring 5 at the height.
It is lifted by and is placed on the push-up ring 7 in a fitting manner. At this time, since the carrier plate 4 is lifted by the spring 5 and the push-up ring 7, the placed glass material 3 does not come into contact with the molding surface of the lower mold 2.

Next, the mold 2 is driven by a mold driving device (not shown).
The mold holding operation is further carried out, but the holding spring 9 and the mold release arm 10 fixed to the upper mold 1 and the mold release unit 11 are fixed to the main body of the molding machine (not shown). However, the upper surface of the transfer tray 4 first comes into contact with the lower surface of the pressing spring 9 as the mold 2 moves up. At this time, the pressing spring 9 generates a pressing force which is much stronger than the expanding force of the spring 5, so that the transport tray 4 stops at the height position at which it abuts.

When the mold 2 is further raised, it is pushed down by the transfer tray 4 and the push-up ring 7 is also pushed down, and the spring 5 is contracted, but the contraction is stopped by the stopper 8. At this time, the height position of the rising mold 2 with respect to the molding surface is fixed.

Further, the mold 2 is raised to stop the rise of the mold 2 at a predetermined middle position of the molded product, but the pressing spring 9 bends upward against the rising pressure of the mold 2 to stop this movement. Absent.

After the molding is completed, the mold 2 is lowered and the mold releasing operation is started. At this time, the mold releasing unit 11 is moved up and down in case the molded product is stuck to the upper mold 1. Peel off the product. At this time, after molding, the transport tray 4
Since the glass material 3 is in close contact with the inner surface of the mold 3 and is difficult to remove, the mold can be released by performing an operation of peeling the transport tray 4 from the upper mold 1. The release arm 10 fixed to the release unit 11 moves up and down to drop the transport tray 4.
Since the pressing spring 9 similarly fixed to the lower side of the release arm 10 is a spring and has no strength, it is pressed against the lower surface of the release arm 10 by the transport tray 4 during the releasing operation, and thus has a releasing effect. Since it cannot be played, it is released by the thick release arm 10.

The height position at which the transfer tray 4 is stopped is preferably a relative position to the molding surface of the mold 2 where the glass material 3 does not lift up from the mounting projection of the transfer tray 4 in the transfer tray 4. .

The materials used for the molds 1 and 2 are WC-based sintered metal with a CrN film deposited on the surface, and the carrier tray 4, push-up ring 7 and stopper 8 are WC-based sintered metal and Ti on the surface.
The N film was CBN vapor-deposited, the spring 5 was a spiral zirconia, the release arm 10 and the plate-shaped pressing spring 9 were stainless steel and the TiN film was CBN vapor-deposited, and the spacer 12 was stainless. The glass material used for molding is Shot
t-SF11 and OHARA-BAL41 were good.

(Effects) According to the molding method and the molding apparatus of the present embodiment described above, the conveying tray 4 is operated during the molding clamping operation.
Since the upper surface of the plate is pressed by the pressing spring 9 and the lower surface of the transfer tray 4 is regulated by the push-up ring 7 and the stopper 8, the height position of the lower side of the transfer tray 4 with respect to the forming surface of the mold 2 is fixed before the start of forming. It becomes possible to do. Therefore, the degree of freedom of the flow of the bulge protruding during the molding of the glass material 3 and the thermal effect of the glass material 3 from the transport tray 4 are made uniform, and a glass molding lens of stable quality can be continuously obtained. Further, in this embodiment, since the lower surface side of the carrying tray 4 is fixed and the upper surface side is pressed and fixed by the pressing spring 9, there is an advantage that an unreasonable force is not applied to each molding member.

[0029]

As described above, according to the optical element molding method of the first aspect of the present invention, the height position of the carrying tray is stabilized during the molding pinching operation and during molding, and the glass plate is projected during molding of the glass material. Since the degree of freedom of the flow of the meat and the thermal influence of the glass material from the carrier dish can be made uniform, it is possible to continuously form glass molding lenses of stable quality.

According to the optical element molding method of the second aspect, it is possible to correct the height position of the conveying tray with respect to the molding surface of the mold during the molding clamping operation and during molding, and the height of the conveying tray at the time of molding. By stabilizing the position, the degree of freedom of flow of the protruding meat during molding of the glass material becomes uniform and the thermal influence of the glass material from the transfer dish becomes uniform, and glass molding lenses of stable quality are continuously molded. can do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view schematically showing a glass lens molding apparatus according to the present invention.

FIG. 2 is a vertical sectional view schematically showing a glass lens molding apparatus according to the present invention.

FIG. 3 is a vertical sectional view showing a glass lens forming apparatus according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a problem of the conventional technique.

[Explanation of symbols]

 1 type 2 type 3 glass material 4 carrier plate 5 spring 6 dead meat 7 push-up ring (holding member) 8 stopper 9 presser spring 10 release arm 11 release unit 12 plate spacer

Claims (2)

[Claims] 1. A method of molding a glass lens, comprising heating and softening a glass material to sandwich and mold the glass material between a pair of upper and lower molds, wherein a carrying tray for carrying the heated and softened glass material is elastically held between the molds, and then the molding and sandwiching is performed. A method for forming a glass lens, which is characterized in that a limit value is set and stopped at a height position of the carrying tray which moves by an operation. 2. A holding member on the outer periphery of the molding die for elastically holding a glass tray for conveying a glass material through an elastic member, and either or both of the tray and the holding member are stopped at a height direction position within a movable range. A glass lens forming apparatus, which is provided with a stopper that allows the glass lens to be formed.