JP2002047016A - Method of manufacturing optical element and its forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an optical element which never generates deformation biased on the forming face of press sliding side, never generates heterogeneity of form, and never generates burrs and residue of distortion, and its forming device. SOLUTION: The forming mold 100 begins pressurizing from top and bottom by lifting the lower head 7 and lowering the upper head 6. When the lower head 7 is lifted, a point inside the link bar 14 is also lifted through a L-shape support and a revolving link 15a, whereby a drum mold 3 is raised when the lifting lever comes into contact with a channel part 3a of the drum mold 3. All the while, heating the heads 6, 7 is continued, the optical element softens, and when both the upper mold 1 and the lower mold 2 begin sliding, increasing pressure makes the upper mold 1 and the lower mold 2 go to the end and the optical element 4 is formed into the shape of the optical element 5. While press forming of this upper mold 1 and the lower mold 2, the drum mold 3 is also moved by the link bar 14, consequently both the upper mold 1 and the lower mold 2 slide against the drum mold 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an optical element used for an optical system such as a photographing lens of a camera and an optical pickup, and a molding apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, when an optical element such as a lens is manufactured by molding, an optical material such as glass or plastic is placed in an upper and lower pressing die and a body die, and the optical material is heated by heating the molding die. It is performed with softening. In other words, in a state where the optical material is softened, the pressing die is pressurized to form a desired optical element shape, and after cooling, the molding die is disassembled to take out the optical element.

Hereinafter, a conventional molding apparatus used in the molding step will be described with reference to FIG. In FIG. 4, a molding die 1 in which an optical material 4 such as glass is disposed in a molding space surrounded by an upper die 1, a lower die 2, and a body die 3.
00 is sent to the heating stage 41 from the mounting table 45 at the entrance. The mold 100 is heated by the heating stage 41, and the optical material 4 is softened and sent to the preforming stage 42. In this preforming stage 42, the upper head 16 a is slid down, the upper mold 1 of the forming die 100 is pushed in, the optical material 4 is preformed halfway, and sent to the main forming stage 43. In the main molding stage 43, the upper head 16b is slid down to form the molding die 100.
The optical material 4 is pressed to the end to form a final optical element shape, and is sent to the cooling stage 44. In the cooling stage 44, the mold 100 is cooled and sent to the mounting table 45 at the outlet. The cooled mold 100 is disassembled and the molded optical element 5 is taken out.

As described above, in the conventional molding apparatus, the molding die 100 is transferred in one direction in a flow operation from the inlet on the heating side to the exit on the cooling side, and the preforming stage 42 and the main molding stage 43 are moved in one direction. For example, it has been general that the upper heads 16a and 16b of both stages are slid down and the upper mold 1 is pushed in to form. In addition, the heating stage 41 is provided in front of the preforming stage 42 to shorten the tact time and increase productivity.

[0005]

In the above-mentioned conventional molding apparatus, since the molding of the optical material 4 is limited to one direction of pushing the upper mold 1, the upper surface side and the lower surface side of the optical material 4 are not formed. This causes a phenomenon that the deformed flow state of the optical material 4 is different. Therefore, the molded optical element 5 has a large deformation flow in the upper mold on the sliding side and is filled with the optical material 4 up to the outer periphery of the upper mold 1, but is molded in the lower mold 2 on the fixed side. However, there has been a problem that it is difficult to form the outer periphery. In addition, if the filling of the optical material 4 is biased only on the sliding side, the problem that the optical material 4 protrudes into the gap between the upper die 1 and the barrel die 3 on the sliding side and burrs are generated easily occurs. . Further, there is a problem in that the deformation and unevenness cause the stress and strain in the optical material 4 to be uneven, which causes a change in the shape of the optical element 5 and uneven optical characteristics after molding.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing an optical element capable of manufacturing an optical element having uniform optical characteristics without causing burrs and having the same deformation flow on the upper surface side and the lower surface side of the optical material. It is to provide a device.

[0007]

According to the present invention, there is provided a method of manufacturing an optical element, comprising: a pair of pressing dies and a body die having a pair of pressing dies and a body die for pressing an optical material. A step of disposing the optical material in the space to be formed, and a step of sliding and pressing both of the pair of pressing dies after the optical material is softened by heating, and each surface of the pair of pressing dies It is characterized in that the shape is transferred to the optical material and molded.

According to this manufacturing method, both the pair of pressing dies are slid and pressurized, and the respective surface shapes of the pair of pressing dies are transferred to both surfaces of the optical material to form the optical material. It is possible to make the deformed flow state uniform on both the upper surface and the lower surface. As a result, the optical element is filled and shaped into the same shape on both surfaces up to the outer periphery. Furthermore, since the deformed flow state of the optical material becomes uniform on the upper and lower surfaces, the occurrence of burrs can be eliminated. In addition, problems such as a change in shape after molding and a residual strain due to non-uniform deformation can be solved.

An optical element molding apparatus according to the present invention comprises a molding stage having a pair of heads capable of controlling pressure and temperature, a molding die inserted between the pair of heads to mold an optical material, It is characterized by comprising means for heating a pair of heads, and means for sliding and pressing both of the pair of heads.

According to the molding apparatus of this configuration, both the pair of heads slide and heat and pressurize the optical material from the upper and lower surfaces, so that the respective surface shapes of the pair of pressing dies can be adjusted. It becomes possible to transfer and mold on both sides. As a result, both sides of the optical element are filled and shaped into the same shape up to the outer periphery. In addition, since the molding stage can be configured with a minimum number of devices at one location, there is an advantage that the device itself can be simplified and inexpensive.

Further, in a conventional molding apparatus having a plurality of molding stages, variations in the shape and characteristics of optical elements have occurred due to the sliding accuracy of each stage and the inclination error of the head facing each other. On the other hand, in the molding apparatus having the single molding stage configuration of the present invention, since there is only one molding stage, it is easy to maintain and manage the accuracy of the molding stage, and it is stable without the influence of the accuracy difference between the molding stages. To form a highly accurate optical element. Furthermore, since there is only one molding stage, it is possible to fix the molding die to the head, and it is also possible to eliminate a change in shape due to a change in the relative position due to the movement of the molding die. Moreover, the number of molds required for production is one for each product type, so that it is not necessary to prepare a plurality of expensive molds.

According to another aspect of the present invention, there is provided an optical element molding apparatus comprising: two molding stages each having a pair of heads capable of controlling temperature and pressure; and an optical material being molded by being inserted between the pair of heads. A molding die, means for heating each of the pair of heads, and a sliding direction of a head on a sliding side of the pair of heads opposed to each other of the two molding stages, the first molding stage and the second molding stage. The molding stage and the molding stage are in opposite directions.

According to the molding apparatus having this configuration, of the pair of opposed heads of the two molding stages,
The sliding direction of the head on the sliding side is opposite to each other in the first molding stage and the second molding stage. Therefore, it is possible to press both the pair of pressing dies in the respective molding stages by sliding them from different directions. As a result, the optical element is filled and shaped into the same shape on the upper and lower surfaces up to the outer periphery. Furthermore, the occurrence of burrs on the sliding side can be eliminated. In addition, problems such as shape change after molding and residual strain due to non-uniformity of deformation can be improved.

Further, since all the steps of heating, molding and cooling can be performed in two molding stages, the time is shortened and productivity is increased as compared with performing all the steps in one molding stage. be able to. In addition, although there are two molding stages, the first stage is responsible for the preforming and cooling steps, and thus the required accuracy may be lower than that of the second stage responsible for the main molding. Therefore, it is easy to maintain and control the molding accuracy of the apparatus, and the cost of the entire molding apparatus can be relatively low. The productivity is inferior to that of a conventional continuous molding apparatus having a large number of molding stages, but the productivity is better than that of a single molding stage apparatus, and a great effect can be obtained for medium- and medium-volume production.

An apparatus for molding an optical element according to still another aspect of the present invention is an apparatus for molding an optical element having at least three molding stages of preheating, main molding, and cooling, wherein the heating preforming stage is provided. And the direction in which the head slides in the main molding stage is opposite to each other.

According to the molding apparatus having this configuration, the sliding direction of the head of the pair of heads opposed to each other in the heating pre-molding stage and the main molding stage is opposite to each other in each stage. Accordingly, by pressing both of the pair of pressing dies from different directions in each of the forming stages and pressing them, the surface shapes of the upper and lower pressing dies can be transferred to the optical material and formed. . As a result, the optical element is filled and shaped into the same shape on the upper and lower surfaces up to the outer periphery. Further, the occurrence of burrs on the sliding side can be eliminated. In addition, problems such as shape change after molding and residual strain due to non-uniformity of deformation can be improved.

Furthermore, the steps required for heating and cooling can be shortened and the temperature adjustment can be made more precise by sharing the respective steps of heating preforming, main forming and cooling with separate forming stages. Further, since a large number of molds can be processed in one-way flow from heating to cooling, productivity can be increased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an optical element molding apparatus according to the present invention will be described below with reference to the accompanying drawings. In the following description, a case where borosilicate glass is molded as an optical material will be described as a specific example.

Embodiment 1 FIGS. 1A and 1B are cross-sectional views showing a molding apparatus for an optical element according to Embodiment 1 of the present invention. FIG. 1A shows a state before molding, and FIG. The state of is shown. As shown in FIG. 1, in the molding apparatus according to the first embodiment, a molding die 1 having a pair of pressing dies, an upper die 1, a lower die 2, and a body die 3.
00 is used. The body mold 3 is fitted into the lower mold 2 and the body mold 3
A spherical borosilicate glass optical material 4 having a diameter of 6 mm is placed on the inner lower mold 2, and the upper mold 1 is fitted into the body mold 3 to assemble the mold 100. The molding die 100 is sent to a molding device and placed on the lower head 7.

In each of the metal blocks of the lower head 7 and the upper head 6, a resistance heater 10 for heating the two heads 6, 7 is embedded, and for measuring the temperature near the molding surface. Thermocouple 11 is embedded. Although not shown, pipes through which cooling water flows are passed through the surface opposite to the surface in contact with the mold 100. The temperature of each of the heads 6 and 7 is measured by a thermocouple 11 and the resistance heater 10 is adjusted to a desired set temperature.
The temperature control is performed by adjusting the current value of. Upper and lower heads 6, 7
Is covered with a chamber 12. Chamber 1
2, the oxidation of the mold 100 and the optical material 4 and the mold 10
An inert gas, preferably nitrogen gas, is introduced to keep the inert gas atmosphere in order to prevent the reaction with and adhesion to zero.

The upper head 6 and the lower head 7 are connected to an upper sliding shaft 8 and a lower sliding shaft 9, respectively. Two L-shaped supports 15 whose roots are fixed to the lower slide shaft 8 extend upward along the side of the lower head 7, and are provided with rotary links 15a near their ends. This rotation link 15a
A link bar 14 is attached via the link, and the link bar 14 has a structure rotatable with respect to the rotation link 15 a of the L-shaped support 15. Further, the chamber 12
, A holding member 13 protruding into the chamber for holding down the outer end of the link bar 14 downward is attached.

Next, a method of molding an optical element by the molding apparatus will be described. As shown in FIG.
When the molding die 100 is fed into the lower head 7, the lower head 7 is at the lowered position, and the tip inside the link bar 14 is waiting at the lowered position. So that it does not interfere with the moving operation. The temperatures of the upper and lower heads 6 and 7 are maintained at 300 ° C., respectively, and the heating is started after the mold 100 is fed, and is heated to 550 ° C. for 8 minutes. As shown in FIG. 1B, the lower head 7 moves upward and the upper head 6 moves upward.
Starts to descend, and the mold 100 is
Start applying pressure with a light load of 0N. Here, when the lower head 7 rises, the L-shaped support 15 also rises, and the outer end of the link bar 14 comes into contact with the holding member 13 and is regulated. The tip also rises, and eventually comes into contact with the groove 3a of the body mold 3 and moves up the body mold 3.

During this pressurization, the respective heads 6, 7
Heating is continued, the temperature is raised to 580 ° C. in 2 minutes,
As the optical material softens, both the upper mold 1 and the lower mold 2 start sliding. And increase the weight to 2000N and 2
In a minute, the upper mold 1 and the lower mold 2 are pushed to the end to form the optical material 4 into the shape of the optical element 5 having a thickness of 2.5 mm.
During press molding of the upper mold 1 and the lower mold 2, the body mold 3 is also moved by the link bar 14. As a result, both the upper mold 1 and the lower mold 2 slide against the body mold 3. are doing.

Thereafter, the temperatures of the upper and lower heads 6 and 7 are lowered, the upper head 6 is separated from the mold 100 on the way to complete the load, and the temperature is lowered to 300 ° C. in 4 minutes. The mold 100 is sent out on top. Cooling plate 1
After lowering the temperature of the mold 100 to room temperature at the point 6, the mold 100 is disassembled, the optical element 5 is taken out, and a series of manufacturing steps is completed. During this time, the time required for the molding process was 16 minutes, excluding the time for assembling and disassembling the mold 100.

In the conventional molding method in which pressure is applied from the upper head side and only the upper mold 1 is slid and pressed, the optical material 4 is biased toward the molding surface of the upper mold 1 and the filling degree of the upper and lower surfaces of the optical element 5 is also biased. I was However, in the molding by the molding apparatus of the first embodiment, the filling degree of the upper and lower surfaces of the optical element 5 can be made uniform. Therefore, in the molding method using the molding apparatus of the first embodiment, there is no burr formed by the optical material 4 entering between the upper mold 1 and the body mold 3, and shrinkage due to cooling after molding at a high temperature. Since the upper and lower surfaces are uniform, an optical element having good shape accuracy and no residual distortion can be obtained.

Embodiment 2 FIGS. 2A and 2B are sectional views of an optical element molding apparatus according to Embodiment 2 of the present invention, wherein FIG. 2A shows a state before molding and FIG. 2B shows a state after molding. The molding die 100
The configuration of the temperature control mechanism such as the heater 10 and the thermocouple 11 of the head and the configuration of the chamber 12 are the same as those of the first embodiment. The L-shaped support 1 described in the first embodiment
5, the component parts of the link bar 14 and the holding member 13 are also provided in the second stage, and are arranged in the depth direction of the sectional view of FIG. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and the duplicate description will be omitted.

In FIG. 2, the optical element molding apparatus of the second embodiment has two molding stages, a first stage 21 and a second stage 22. The molding die 100 on which the optical material 4 is placed is a first stage 2 set at 300 ° C.
It is sent to 1. After the injection of the molding die 100, the upper and lower heads 6a and 7a of the first stage 21 start heating. At first, the upper head 6a does not contact the upper die 1, but when the temperature reaches 550 ° C. in 5 minutes, the upper head 6a descends. The upper die 1 is slid to start pressing. The pressurization starts from a light load of 100N and is increased to 500N when it reaches 580 ° C two minutes later. The optical material 4 has a spherical shape with a diameter of 6 mm and has a small contact surface with the pressing mold at the initial stage of deformation, so that it can be easily molded with a light load. Therefore, the first stage 21 has a thickness of 4 mm by a moderate load of about 500N. Mold until it is about

In the molding apparatus of the second embodiment, since the upper head 6a is lowered and slid on the first stage 21, the optical material 4 is placed closer to the molding surface of the upper mold 1 than to the lower mold 2. Copy molding will proceed more. Next, the mold 10
0 is sent to the lower head 7 of the second stage 22.
The temperature of the upper and lower heads 6b and 7b of the second stage 22 is 58
Standing at 0 ° C., the lower head 7b slides up, contrary to the first stage 21, presses from the lower mold 2 at 2,000 N, and pushes down to a thickness of 2.5 mm in one minute to perform molding. Complete. In the first stage 21, the upper head 6b was slid and the upper mold 1 was deformed much, but in the second stage 22, the lower head 7b was slid and the molding was advanced from the lower mold 2, so that the optical material The deformation is larger on the lower surface, and finally, the degree of deformation on the upper and lower surfaces of the optical element 5 is almost uniform.

After completion of the molding on the second stage 22, the molding die 100 is returned to the first stage 21, but the upper and lower heads 6 of the first stage 21 are formed during the molding on the second stage 22.
The temperatures of a and 7a have dropped to 530 ° C. Mold 10
0 is returned to the first stage 21 and cooling is continued. After the temperature has dropped to 300 ° C. in three minutes, the mold 100 is placed on the cooling plate 16b from the first stage 21 and further cooled and then sent out. It is. Thereafter, after the temperature has dropped to room temperature, the mold 100 is disassembled and the optical element 5 is taken out to complete the manufacturing process.

During this time, the time required for the molding process was 11 minutes except for the time for assembling and disassembling the mold. Since the process is divided into two stages, the required time is reduced to about 2/3 as compared with the apparatus having only one stage in the first embodiment. Since the pressure in the first stage 21 is smaller than that in the second stage 22, the upper and lower heads 6 of the first stage 21
The a, 7a, the sliding shaft, and the like can be small, and the molding device can be simple and inexpensive. The molded optical element 5 has a uniform filling degree on the upper and lower surfaces, does not generate burrs, and has a uniform shrinkage upon cooling, so that an optical element having good shape accuracy and no residual distortion can be obtained.

Embodiment 3 FIG. 3 is a sectional view of an optical element molding apparatus according to Embodiment 3 of the present invention. The configurations of the molding die, the head temperature control mechanism, and the chamber in the molding apparatus of the third embodiment are the same as those of the first embodiment. The components of the L-shaped support, link bar, and holding member described in the first embodiment are also provided in the preforming stage 32, and are arranged in the depth direction of the cross-sectional view of FIG. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and the duplicate description will be omitted.

Referring to FIG. 3, a molding apparatus according to the third embodiment includes:
It has four stages: a heating stage 31, a preforming stage 32, a main molding stage 33, and a cooling stage 34. Then, the mold 100 flows in one direction from the heating to the cooling, and the stages 31, 32, 33, 3
Reference numeral 4 denotes a structure in which a plurality of molds 100 can be simultaneously transferred and molded at the same time with the same residence time. Mold 10 on which a spherical optical material 6 mm in diameter is placed
0 is sent to the heating stage 31 in which the temperature of the upper and lower heads 6c and 7c is set to a steady temperature of 500 ° C.
Is pressed from the upper head 6c side with a small load. Since the heating stage 31 has a very light weight and the optical material 4 is not sufficiently softened, the deformation amount is very small.

In the molding apparatus of the third embodiment, the wafer is transferred to the next preforming stage 32 with a tact time of 2 minutes. The temperature of the upper and lower heads 6d and 7d in the preforming stage 32 is controlled to be constant at 580 ° C., and as shown in FIG. 3, the lower head 7d slides upward to press the lower mold 2 at 500N. Here, the optical material 4 is deformed more to follow the molding surface of the lower mold 2 and the molding proceeds to a thickness of about 4 mm.

Next, the molding die 100 includes upper and lower heads 6e, 7e.
e is transferred to the main molding stage 33 in which the temperature of the upper head 6e is maintained at 580 ° C.
Slides downward to press the upper mold 1 under a load of 2000 N to form a final dimension of 2.5 mm in thickness. In the preforming stage 32, the lower head 7d was slid and the lower mold 2 side was deformed much. However, in the main forming stage 33, the upper head 6e was slid and the molding was advanced from the upper mold 1 side. The number of deformations of the upper surface of the optical element is larger than that of the upper surface of the optical element.

Next, the mold 100 is transferred to the cooling stage 34 and cooled while receiving a pressure of 500 N at 450 ° C. Further, the molding die 100 is placed on the cooling plate 16c, cooled and sent out of the molding device. After the temperature is lowered to room temperature, the molding die 100 is disassembled and the optical element 5 is taken out to complete a series of manufacturing steps. During this time, the time required for the molding process was 8 minutes, excluding the time for assembling and disassembling the mold 100.

In the molding apparatuses of Examples 1 and 2, it takes a long time to change the temperature of each stage. On the other hand, in the molding apparatus of Example 3, the entire process is divided into four stages. Since the upper and lower heads of each stage are kept at an optimum temperature, the time required for all the steps is short. Furthermore, although the molding apparatuses of the first and second embodiments can accommodate only one molding die 100, the molding apparatus of the third embodiment can arrange the molding dies 100 on each stage and proceed with the manufacturing process. it can. As a result, although the time required in the molding process is 8 minutes, the molding apparatus can process one molding die 100 every 2 minutes, and the productivity is very high. The molded optical element 5 has a uniform degree of filling of the upper and lower surfaces, does not generate burrs, and has a uniform shrinkage upon cooling, so that an optical element with good shape accuracy and no residual distortion can be manufactured inexpensively and in large quantities. Becomes possible.

In the present embodiment, a molding apparatus having four stages has been described. However, the number of stages is not limited to this, and three or more stages may be provided. Needless to say. Further, in the molding apparatuses of the first to third embodiments, the molding dies are pressurized by sliding in the vertical direction. However, the present invention is not limited to this. Can be applied to pressurization from both opposite directions. Although borosilicate glass has been described as the optical material 4, the present invention can be applied to glass and resin materials of other materials.

[0038]

As has been described in detail in the above embodiments, according to the method for manufacturing an optical element of the present invention, a pair of pressing dies are pressed from both molding surfaces of the optical element so as to face each other. The shape of the molding surface to be formed is uniform, no burr occurs,
An optical element having good shape accuracy and no residual distortion can be formed. Also, by increasing the number of molding stages and changing the pressing direction of each molding stage, it is possible to provide an optical element molding apparatus suitable for the number and types of optical elements produced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an optical element forming apparatus according to a first embodiment of the present invention, in which (a) is a cross-sectional view showing a state before forming, and (b).
2 is a sectional view showing a state after molding.

FIGS. 2A and 2B are cross-sectional views of an optical element forming apparatus according to a second embodiment of the present invention, wherein FIG. 2A is a cross-sectional view showing a state before forming, and FIG.
2 is a sectional view showing a state after molding.

FIG. 3 is a cross-sectional view of an optical element molding apparatus according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional optical element molding apparatus.

[Explanation of symbols]

 Reference Signs List 1 upper die 2 lower die 3 trunk die 3a groove 4 optical material 5 optical element 6, 6a, 6b, 6c, 6d, 6e, 6f upper head 7, 7a, 7b, 7c, 7d, 7e, 7f lower head 8 upper sliding Moving shaft 9 Lower sliding shaft 10 Resistance heater 11 Thermocouple 12 Chamber 13 Holding member 14 Link bar 15 L-shaped support 15a Rotating link 16, 16a, 16c Cooling plate 21 First stage 22 Second stage 31 Heating stage 32 Preforming Stage 33 Main molding stage 34 Cooling stage 100 Mold

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B29C 43/58 B29C 43/58 C03B 11/12 C03B 11/12 11/16 11/16 // B29L 11:00 B29L 11 : 00 (72) Inventor Tomoaki Shimazaki 1006 Kadoma, Kazuma, Osaka Prefecture F-term (reference) 4F202 AA49 AH74 AM30 AP05 AR06 CA09 CB01 CC01 CK42 CL02 CL50 CN01 CN05 CN18 4F204 AA49 AH74 AM30 AP05 AR06 FA01 FB01 FN11 FN15 FQ11

Claims (16)

[Claims] A step of arranging the optical material in a space formed by the pair of pressing dies and the body die of a molding die having a pair of pressing dies and a body die for press-molding the optical material; After the optical material is softened, the method further includes a step of sliding and pressing both of the pair of pressing dies, wherein each surface shape of the pair of pressing dies is transferred to the optical material and molded. A method for manufacturing an optical element. 2. A molding stage having a pair of opposing heads capable of controlling temperature and pressure, a molding die inserted between the pair of heads to press-mold an optical material, and a pair of heads. An apparatus for forming an optical element, comprising: means for heating; and means for sliding and pressing both of the pair of heads. 3. The apparatus for molding an optical element according to claim 2, further comprising a chamber that covers the periphery of the molding stage and blocks outside air, and the inside of the chamber is an inert gas atmosphere. 4. As means for heating the pair of heads, a resistance heater is embedded in each of the heads, and the control of the temperature of the pair of heads is embedded near the press surface of each of the heads. 4. The optical element molding apparatus according to claim 2, wherein an output of the resistance heater is controlled by a temperature detected by a thermocouple. 5. The optical device according to claim 2, wherein a cooling plate on which the molding die can be placed is provided between a pair of heads of the molding stage and an insertion outlet of the molding die. Device molding device. 6. An L-shaped means for sliding and pressurizing both of said pair of heads, wherein a first end is fixed to a lower sliding shaft and a second end extends from the side of the lower head upward. , A rod-shaped link bar rotatably supported by a support near the second end of the support, and a holding member protruding in the direction of the forming die provided on a fixed portion around the forming stage. When the lower head is downward, the first end of the link bar is inclined downward and does not contact the body of the molding die,
As the lower head ascends, the second end of the link bar contacts the holding member and is regulated, and the first end of the link bar moves upward through a support portion with the support, and 6. The optical element molding apparatus according to claim 2, wherein the apparatus is configured to push up the body mold in contact with the body mold. 7. Two molding stages each having a pair of opposing heads each capable of controlling temperature and pressure, a molding die inserted between the pair of heads to press-mold an optical material, and the pair of heads Means for heating, and that the sliding direction of the head on the sliding side of the pair of heads facing each of the molding stages is opposite to each other in the first molding stage and the second molding stage. Characteristic optical element molding device. 8. A molding apparatus for an optical element according to claim 7, further comprising a chamber which covers the periphery of said two molding stages to block outside air, and wherein said chamber has an inert gas atmosphere. . 9. A resistance heater embedded in the heads of the pair of heads, and embedded near the press surfaces of the respective heads as temperature detecting means for controlling the temperatures of the pair of heads. 9. An apparatus for molding an optical element according to claim 7, further comprising means for controlling an output of said resistance heater by a thermocouple and a detection output of said thermocouple. 10. The optical device according to claim 7, wherein a cooling plate on which a molding die can be placed is provided between at least one of the two molding stages and the entrance of the molding die. Device molding device. 11. A molding stage in which a lower head slides among the two molding stages, wherein a first end is fixed to a lower sliding shaft, and a second end extends upward from a side of the lower head. An L-shaped support, a rod-shaped link bar rotatably supported by a support near a second end of the support, and a protrusion protruding in a direction of the forming die provided on a fixed portion around the forming stage. When the lower head is below, the first end of the link bar is inclined downward and does not contact the body of the molding die, and as the lower head rises, A second end of the link bar is regulated by contacting the holding member, and a first end of the link bar moves upward through a connection portion with the support, contacts the trunk mold, and 9. The method according to claim 7, wherein the body is pushed up. Or forming apparatus of an optical element according to 10. 12. An optical element molding apparatus having at least three molding stages of heating preforming, main molding, and cooling, wherein: a direction in which a head slides in the heating preforming stage; An optical element molding apparatus, wherein directions in which a head slides on a stage are opposite to each other. 13. The optical element molding apparatus according to claim 12, further comprising a chamber that covers at least a periphery of each of the molding stages to be heated and blocks external air, and the inside of the chamber is an inert gas atmosphere. 14. A resistance heater embedded in a head of said pair of head heating means, and a thermocouple embedded near a press surface of each head for controlling the temperature of said pair of heads. 14. An apparatus for forming an optical element according to claim 12, further comprising means for controlling an output of said resistance heater by a detection output of said thermocouple. 15. The optical element molding apparatus according to claim 12, wherein a cooling plate on which the molding die can be placed is provided between the cooling stage and the exit of the molding die. 16. A molding stage in which a lower head slides out of a heating preforming stage and a main molding stage, wherein a first end is fixed to a lower sliding shaft, and a second end is upward from a side of the lower head. An extending L-shaped support, a rod-shaped link bar rotatably supported by a support near a second end of the support, and a direction of the forming die provided on a fixed portion around the forming stage. When the lower head is below, the first end of the link bar is inclined downward and does not contact the body of the molding die, and the lower head rises. As the second end of the link bar comes into contact with the holding member and is regulated, the first end of the link bar moves upward through a support portion with the support, and comes into contact with the body mold. Claims: The body is configured to be pushed up. 12, 13, 14
Or a molding device for an optical element according to item 15.