JPH111329A - Molding of optical glass element and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for molding an optical glass element, enabling to improve the condition efficiency of heat to molds and an optical glass raw material, easily control the molding temperature, greatly shorten a time for molding the optical glass element and improve productivity. SOLUTION: This method for producing an optical glass element comprises disposing an optical glass element raw material 4 between a pair of molds 1, 2, simultaneously heating the molds and the optical glass element raw material 4 to soften the optical glass element raw material 4, pressing the molds 1, 2 to mold the optical glass element raw material 4, cooling the molds 1, 2 and the molded glass element, and subsequently demolding the optical glass element from the molds 1, 2. Therein, at least the molds 1, 2 are directly heated with a high temperature liquid 8, and subsequently cooled with a low temperature liquid 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for molding an optical glass element, and more particularly to a heating and cooling means for a molding die and an optical glass material.

[0002]

2. Description of the Related Art In recent years, the need for aspherical lenses has been increasing due to demands for higher performance of lenses themselves and reduction in the number of lenses in a lens system. For the manufacture of glass lenses, means for finishing glass materials by spherical polishing has been used for a long time.However, it is extremely difficult with current technology to manufacture aspheric lenses by polishing. is there. Therefore, it has been considered to manufacture an aspheric lens by molding technology.However, plastic materials that can be easily molded by injection molding or the like have a limit in optical performance in terms of refractive index and the like, so glass is used. Development of molding technology is being actively pursued.

[0003] In a conventional optical glass molding method, a glass material and a pair of molding dies are put together in a cylindrical body mold, and the molding dies are heated by high frequency heating, infrared heater heating or atmospheric heating. After transferring heat from the mold to the glass material and softening the glass material, the mold is pressed to form the glass material, and then the molded product is cooled together with the mold using nitrogen gas or the like. However, in this method, it takes time until the glass material is softened by heating, and there is a disadvantage that productivity does not increase. Therefore, means for shortening the heating time has been proposed.

[0004] For example, Japanese Patent Publication No. Hei 5-79612 discloses that an optical element material is irradiated with an energy beam such as a helium / neon laser beam to soften the optical element material (glass material) at the same time as induction heating of a mold. A technique for reducing the time required is disclosed. This technique will be described with reference to FIG. 5, reference numeral 101 denotes an optical element material; 103, an upper mold; 105, a lower mold; 107, a barrel mold; a lower mold 105 supported on a holder 109; The upper mold 103 is supported above the lower mold 105 and the body mold 10
7 is arranged to be vertically movable. The upper die 103 is connected to a cylinder 113 via a holder 111,
The upper die 103 moves up and down by the operation of the cylinder 113.

The upper die 103, the lower die 105, and the body die 10
Reference numeral 7 is formed of a material that is easily heated by induction such as WC, stainless steel, and a Ni-based alloy. The upper and lower molds 103,
Molding surface 105, after shaved a respective preform WC to the desired aspherical in ultra-precision lathe and polished to be less than the surface roughness R _max = 0.02 [mu] m by using a diamond paste abrasive, Thereafter, the coating 115 is formed by applying 2 μm. This coating 115 is provided to improve the oxidation resistance and wettability of the surface of the mold.
As the material of No. 5, for example, noble metals such as platinum and gold, or alloys thereof, and ceramics such as SiC, Si ₂ N ₄ , TiN, and TiC are used.

[0006] An energy beam 117 for heating the optical element material 101 placed on the lower mold 105 is directed toward the optical element material 101.
A hole 119 is formed to pass through. The hole 119 is formed at a location that is closed by the upper die 103 during the pressing so that the pressing of the optical element material 101 can be performed without any trouble. The upper and lower holders 109 and 11
1, upper and lower molds 103 and 105 and a trunk mold 107 are covered with a seal box 121 made of quartz, and an induction coil 123 is provided outside the seal box 121.

Next, a molding method will be described. Spherically polished F2 as optical element material (made by Ohara Optical Glass)
And a helium / neon gas laser beam was used as the energy beam 117. First, the optical element material 101 is placed on the lower mold 105 and set as shown in FIG. Immediately after the setting, the upper and lower molds 103 and 105 and the trunk mold 107 are induction-heated by the induction coil 123, and in parallel with this heating, a helium / neon gas laser beam is applied to the optical element material 101 from the outside of the seal box 121 through the hole 119. Irradiation is performed to heat the optical element material 101.
During the above-mentioned heating, non-oxidizing nitrogen gas is supplied into the seal box 121 from the gas supply port 121A in order to prevent oxidation of the upper and lower dies 103 and 105, the body die 107 and the like. By the above method, a predetermined temperature (a mold 460 ° C.,
It could be heated to 480 ° C. in 5 minutes.

Then, after the heating by the induction coil 123 and the laser beam is interrupted, the optical element material 101 is pressed and formed by the upper and lower dies 103 and 105 at a pressure of about 100 kg / cm ² . Then, cooling is performed in that state, and when the temperature of the molded portion falls below the transition point of the optical element material 101 (430 ° C.), the pressure is released, the cylinder 113 is raised, and the molded lens is taken out.

[0009]

However, the above-mentioned prior art has the following problems. That is, since the glass is a transparent body, the absorptivity of an energy beam such as a laser beam is extremely poor, and enormous energy is required to heat the glass to a softened state in which the glass can be formed. Moreover, in order to form the glass with high precision, it is necessary to make the temperature of the entire glass substantially uniform. However, when an energy beam is used, a temperature distribution is always generated inside the glass. During cooling, the glass formed is cooled by the nitrogen gas through the body mold and the upper and lower molds.However, since the heat transfer coefficient of the gas with respect to the solid is small, heat is released from the body mold and the mold. Efficiency is not very good. Therefore, the glass placed between the molds is heated and molded, and the molding time until the glass can be taken out from between the molds after molding becomes long, which is not a highly productive molding method.

[0010] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention according to claim 1 is that heat transfer efficiency between a molding die and an optical glass material is good, and temperature control is easy. An object of the present invention is to provide a method for molding an optical glass element, which can significantly reduce the molding time of the optical glass element and improve productivity. An object of the invention according to claim 2 or 3 is to provide a molding apparatus for an optical glass element for performing the molding method according to the invention according to claim 1.

[0011]

According to a first aspect of the present invention, an optical glass material is disposed between a pair of molds, and the mold and the optical glass material are heated simultaneously. After softening the optical glass material, pressing the mold to form the optical glass material, cooling the mold and the molded optical glass element, and releasing the mold to release the optical glass element In the method for molding an optical glass element, the at least the mold is directly heated with a high-temperature liquid, and at least the mold is cooled with a low-temperature liquid. The invention according to claim 2 or 3, wherein the optical glass material is disposed between a pair of molds, and the mold and the optical glass material are simultaneously heated to soften the optical glass material. Pressing to mold the optical glass material, cooling the mold and the molded optical glass element, then releasing the mold and taking out the optical glass element A heating / cooling mechanism for heating and cooling the mold and the optical glass material by contacting with the liquid, and a liquid temperature adjusting mechanism for adjusting the temperature of the liquid from a temperature below the strain point temperature to a temperature of the optical glass material to the molding temperature. It is characterized by having.

In the operation of the invention according to claim 1, at least the mold is directly heated by the high-temperature liquid, and at least the mold is cooled by the low-temperature liquid. Further, the efficiency of the cooling process can be greatly increased. Further, the temperature of the liquid is freely adjusted from a temperature around the strain point temperature of the glass (a temperature at which the viscous flow of the glass cannot practically occur; a viscosity of about 10 ^14.5 poise) to a temperature at which the optical glass material can be molded. Thereby, at least the temperature of the mold can be rapidly heated and cooled with a small thermal shock. In the operation of the invention according to claim 2 or 3, the heating and cooling mechanism for heating and cooling the molding die and the optical glass material by bringing the liquid into contact with at least the molding die, and the optical glass from the temperature below the strain point temperature. The provision of the liquid temperature adjusting mechanism for adjusting the temperature of the raw material to a temperature that reaches the molding temperature allows the molding method according to the first aspect of the present invention to be efficiently performed. In the operation of the invention according to claim 3, in addition to the above operation, the liquid temperature adjustment mechanism includes a heating tank that heats the liquid, a cooling tank that cools the liquid, and a liquid tank from the heating tank that is sent to the heating and cooling mechanism. By providing a flow control valve for adjusting the amount and the amount of liquid from the cooling tank, respectively, the flow rate of the liquid is adjusted to change the mixing ratio between the high-temperature liquid and the low-temperature liquid, and the mixed liquid Temperature change can be adjusted.

[0013]

First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram of an optical glass element forming apparatus, and FIG. 2 is a perspective view of a sleeve. Embodiment 1 of the present invention describes a case where a convex lens is formed as an optical glass element.

In FIG. 1, a cylindrical sleeve 3 for positioning the axis of the upper and lower molds is disposed inside a forming tank 7, and the upper mold 1 and the lower mold 2 are slidably fitted to the sleeve 3. doing. An optical glass material 4 is arranged between the molding surface of the upper mold 1 and the molding surface of the lower mold 2. Above the upper mold 1,
A main shaft 5 that is freely movable up and down is provided. The upper mold 1, the lower mold 2, the sleeve 3, and the optical glass material 4 are combined as shown in the figure to form a mold set 18, and the mold set 18 is provided with the heat transfer stored in the mold tank 7. It is completely immersed in the medium 8. The heat transfer medium 8 is
It is constantly stirred by a stirring rod 15 having a blade at the lower end. The lower mold 2 incorporates a thermocouple 6 and is connected to a temperature controller (not shown). When the mold set 18 is placed in the molding tank 7, a window 3a is formed on the side of the sleeve 3 so that the heat transfer medium 8 can freely enter and exit the gap between the inner wall of the sleeve 3 and the molding surfaces of the upper and lower dies 1, 2. (See FIG. 2).

A supply port 16 and a discharge port 17 are provided in the lower part of the side wall of the forming tank 7 at positions substantially opposed to each other, and serve as an inlet and an outlet for the heat transfer medium 8, respectively. Outlet 1
The pipe 7 communicates with the collection tank 12 via the collection pump 14, and the heat transfer medium 8 collected by the collection pump 14 from the outlet 17 is stored in the collection tank 12. The recovery tank 12 communicates with the heating tank 9 and the cooling tank 10 via a pipe, and the heat transfer medium 8 stored in the recovery tank 12 is supplied to the heating tank 9 and the cooling tank 10, respectively. The heating tank 9 and the cooling tank 10 are each connected to a switching valve 11 via a pipe, and the switching valve 11 is connected to a supply port 16 via a supply pump 13. The heat transfer medium 8 heated to a predetermined temperature in the heating tank 9 is supplied to the supply pump 13
After passing through the switching valve 11, it is supplied from the supply port 16 into the inside of the forming tank 7. Further, the heat transfer medium 8 cooled to a predetermined temperature in the cooling tank 10 is also sucked up by the supply pump 13, passes through the switching valve 11, and is supplied from the supply port 16 into the forming tank 7. Further, between the heating tank 9 and the switching valve 11, and between the cooling tank 10
A flow control valve 19 is provided between the switch valve 11 and the switching valve 11 so that the flow rate of the heat transfer medium 8 can be freely adjusted.

In the first embodiment of the present invention, P-SK manufactured by Sumita Optical Co., Ltd. is used as the glass material of the optical glass material 4 to be molded.
50 (Tg point temperature 381 ° C, At point temperature 403 ° C)
6 was used after being polished into a ball lens shape. The upper mold 1, the lower mold 2 and the sleeve 3 are made of cemented carbide (WC), and the molding surfaces of the upper mold 1 and the lower mold 2 are finished to concave mirror surfaces. Further, the main shaft 5, the forming tank 7, and all the pipes for piping are made of stainless steel. As the heat transfer medium 8, mineral oil of ISO VG78 class (boiling point 4
80 ° C.).

Next, a method of forming an optical glass element using the above-described forming apparatus will be described. In a stage before molding, a sufficient amount of the heat transfer medium 8 heated to 430 ° C. is stored in the heating tank 9, and a sufficient amount of the heat transfer medium 8 cooled to 30 ° C. is stored in the cooling tank 10. The amount is stored. First, lower mold 2
The optical glass material 4 is placed on the molding surface of
To the sleeve 3. The upper mold 1 is fitted to the sleeve 3 fitted to the lower mold 2 without damaging the optical glass material 4. The mold set 18 thus assembled is slowly sunk below the main shaft 5 of the molding tank 7 and disposed. At this time, the temperature of the heat transfer medium 8 stored in the forming tank 7 is around room temperature.

Next, the switching valve 11 is switched, and the heat transfer medium 8 in the heating tank 9 is supplied to the forming tank by the supply pump 13. At this time, the supply is performed while stirring the inside of the forming tank 7 with the stirring rod 15. The same amount of the heat transfer medium 8 as the supply amount of the heat transfer medium 8 supplied from the port 16 is discharged by the recovery pump 14 to the discharge port 17.
Discharged from The stirring rod 15 has an effect of preventing a remarkable temperature distribution from being generated inside the forming tank 7. By these operations, the temperature inside the forming tank 7 rises rapidly. When the thermocouple 6 indicates a predetermined temperature, pressure is applied to the main shaft 5 to press the upper mold 1. Since the optical glass material 4 is deformed by pressurizing for a predetermined time, the pressure applied to the main shaft 5 is released during the time when the desired thickness is obtained, and the switching valve 1
1 is switched to the cooling tank 10 side. Then, since the cold heat transfer medium 8 flows into the molding tank 7 from the cooling tank 10, the mold set 18 is rapidly cooled. When the mold set 18 is cooled down to near normal temperature, the mold set 18 is taken out of the molding tank 7 and the molding operation is completed.

According to the molding method described above, the molding die set 1
8, ie, heating and cooling of the upper mold 1, the lower mold 2, the sleeve 3, and the optical glass material 4, the lower mold 2
Was raised to 420 ° C. in one minute.
Further, it was possible to cool from 420 ° C. to 30 ° C. in one minute. Further, when the temperature of the lower mold 2 reached 420 ° C., it was pressurized for 2 minutes and then cooled, and the molded product was taken out from the molding die set 18. As a result, a convex lens as an optical glass element having a desired shape could be obtained. Was.

According to the first embodiment of the present invention, the mold and the optical glass material are heated and cooled by the liquid, so that the heat transfer efficiency between the mold and the optical glass material is good and the temperature is controlled. The heating and cooling of the mold and the glass can be performed easily and in a very short time, and the productivity of the molding process of the optical glass element can be improved.

In the first embodiment of the present invention, mineral oil of ISO VG78 class was used as the heat transfer medium. However, instead of this, a liquid phase from about 100 ° C. or less to about 600 ° C. reacts with glass. If the substance is difficult, it can be used as a heat transfer medium. It goes without saying that the material used as the mold material can be any material suitable for glass molding, such as SiC or alumina. The glass type to be molded should have as low a deformation point (At point temperature) of the glass as possible in order to reduce the load on the heat transfer medium that is vulnerable to high temperatures. No restrictions. Further, by this molding means, an optical element having a shape other than the convex lens, for example, a concave lens, a meniscus lens,
Optical elements such as prisms and filters can also be precisely molded.

[0022]

Second Embodiment FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 is a schematic configuration diagram of an optical glass element forming apparatus, and FIG. 4 is a top view of a sleeve. In the second embodiment of the present invention, the heating tank 9, the cooling tank 10, the switching valve 11, the recovery tank 12, and the like, and the temperature adjustment mechanism using the supply pump 13 and the recovery pump 14 are used. Meanwhile, a molding apparatus capable of molding a glass material having a higher At point is proposed. In addition, supply pump 1
Each of the pipes 3 and the recovery pump 14 is branched into a large number on the supply pump 13 side downstream of the supply pump 13, and this branch pipe is indicated as a supply pipe 28 on the upper mold side and the lower mold side in FIG. And a heat transfer pipe 25 at a sleeve 23. On the side of the recovery pump 14, a large number of tubes are bound upstream of the recovery pump 14, and each of the bundled tubes is indicated as a discharge pipe 29 on the upper die side and the lower die side.
The sleeve 23 is connected to a heat transfer pipe 25.
Further, also in Embodiment 2 of the present invention, a case where a convex lens is formed as an optical glass element will be described.

In FIG. 3, an upper mold 21 and a lower mold 22 are provided.
Is formed with a step having a small diameter portion and a large diameter portion, and a molding surface is formed on the tip side of the small diameter portion. The upper mold 21 and the lower mold 22 are arranged such that the molding surfaces face each other. An optical glass material 24 having a ball lens shape is disposed between the upper mold 21 and the lower mold 22. The large diameter portions of the upper mold 21 and the lower mold 22 are slidably fitted to the cylindrical sleeve 23, and the axis of the upper mold 21 and the lower mold 22 is positioned. The ends of the upper shaft 26 and the lower shaft 27 are connected to the ends of the large-diameter portions of the upper mold 21 and the lower mold 22, respectively. Has a hole with a bottom, and temperature control chambers 30 and 31 are formed. The temperature controlled heat transfer medium 8 circulates in the temperature control chambers 31 and 32.

The supply pipes 28 disposed on the side surfaces of the shafts 26 and 27 are connected to the temperature control chambers 30 and 31 of the molding die composed of the upper die 21 and the lower die 22. Are directed to the bottom surfaces of the bottomed holes of each type, so that the heat transfer medium 8 from the heating tank 9 and the cooling tank 10 can flow into the temperature control chambers 30 and 31. As described above, the temperature control room 3
Reference numerals 0 and 31 are formed while being sealed by an upper shaft 26 and a lower shaft 27 that support the upper mold 21 and the lower mold 22 and can press the optical glass material 24 from above and below by a pressure mechanism (not shown). Discharge pipes 29 are provided on the side surfaces of the upper shaft 26 and the lower shaft 27 for returning the medium to the collection tank. The discharge port of each of the discharge pipes 29 is provided at a position farther from the bottom surface of the bottomed hole of each type than the position of the open end of the supply pipe 28. Further, a plurality of heat transfer pipes 25 are embedded in the cylindrical sleeve 23 in the axial direction.
5 are connected to the supply pump 13 or the recovery pump 14, respectively, so that the heat transfer medium 8 can be circulated.

In the second embodiment of the present invention, as the heat transfer medium 8 for controlling the temperature of the upper mold 21, the lower mold 22, and the sleeve 23, metallic sodium (a melting point of about 100 ° C., a boiling point of 900 ° C.)
Near). The upper mold 21, the lower mold 22, and the sleeve 23 were made of cemented carbide (WC), and the structural materials such as the upper shaft 26, the lower shaft 27, the supply pipe 28, and the discharge pipe 29 were all stainless steel. As the glass material of the optical glass material 24 to be molded, PBH6 (At point temperature: 476 ° C.) manufactured by Ohara Corporation was used. The temperature of the heat transfer medium 8 in the heating tank 9 is 485 ° C.
The temperature of the heat transfer medium 8 at 0 was 120 ° C. This one
20 ° C. is a temperature lower than the strain point temperature of the optical glass material 24.

Next, a method for molding an optical glass element using the above molding apparatus will be described. First, the optical glass material 24 is placed between the upper mold 21 and the lower mold 22 and the sleeve 2
3 is fitted to the upper mold 21 and the lower mold 22 to position the upper mold 21 and the lower mold 22, and is held at the position where the sleeve 23 is positioned by holding means (not shown). Next, the heat transfer medium 8 is transferred from the heating tank 9 to the upper and lower temperature control chambers 3.
0, 31, and a plurality of heat transfer pipes 25, respectively. Then, the mold temperature starts to rise rapidly, and the viscosity of the optical glass material 24 starts to decrease. Optical glass material 2
When the temperature of the entire mold 4 becomes substantially uniform and the mold is softened, the upper mold 21 and the lower mold 22 are moved to the upper shaft 26 and the lower shaft 2.
7 to form a desired optical glass element shape. At this time, the temperature of the upper mold 21 and the lower mold 22 is 480 ° C.
Met.

When the optical glass material 24 is formed into a desired shape, the pressure applied to the upper shaft 26 and the lower shaft 27 is released, the switching valve 11 is switched, and the heat transfer medium 8 in the cooling bath 10 is connected to the heat transfer pipe 25. It flows into the temperature control rooms 30 and 31 and
The lower mold 22 and the sleeve 23 are cooled. At this time, the molding surface of the molded optical glass element may sink due to rapid cooling of the upper mold 21 and the lower mold 22. In order to prevent this, the pump is stopped immediately before the switching valve 11 is switched, and the temperature of the lower mold 22 is cooled by natural cooling to near the Tg point temperature, or the cooling is switched to the cooling tank 10 side, and the flow rate adjusting valve 19 is used. It is effective to reduce the flow rate of the heat transfer medium 8 and reduce the cooling rate. When the temperatures of the upper mold 21 and the lower mold 22 reach 130 ° C. on the low temperature side, the molded optical glass element is taken out of the molding apparatus and the molding operation is completed.

According to the above-described molding method, the upper mold 21 and the lower mold 2
2. When the heating and cooling of the sleeve 23 and the optical glass material 24 were performed, the temperature of the lower mold 22 was raised to 480 ° C.
Up to 1 minute. Further, it was possible to cool from 480 ° C. to 130 ° C. in one minute. Further, when the temperature of the lower mold 22 reached 480 ° C., the mixture was pressurized for 2 minutes and then cooled, and the molded product was taken out from the molding apparatus. As a result, a convex lens as an optical glass element having a desired shape could be obtained.

According to the second embodiment of the present invention, in addition to the same effects as in the first embodiment of the present invention, the gas and the heat transfer medium do not come into direct contact with each other. There is an effect that even a substance that changes the properties of the glass material can be used as a heat transfer medium.

In the second embodiment of the present invention, metallic sodium is used as the heat transfer medium.
Any substance that is in a liquid phase from 00 ° C. or lower to around 800 ° C. and does not easily erode metals, ceramics, etc. can be used as a heat transfer medium. For example, Na-K, mercury, or the like can be used. It goes without saying that the material used as the mold material can be any material suitable for glass molding, such as SiC or alumina. The glass type to be molded should have as low a deformation point (At point temperature) of the glass as possible in order to reduce the load on the heat transfer medium that is vulnerable to high temperatures. No restrictions. Further, by this molding means, an optical element having a shape other than the convex lens, for example, a concave lens, a meniscus lens,
Optical elements such as prisms and filters can also be precisely molded.

In the first embodiment of the invention, the heat transfer medium in the cooling tank is 30 ° C., and in the second embodiment, the heat transfer medium is 130 ° C. At least a temperature at which the optical glass element after molding does not deform between the upper and lower molds, that is, a temperature at which the optical glass element solidifies to a state where deformation does not occur even when pressure is applied to the upper and lower molds. C. or lower, preferably around room temperature.

[0032]

According to the first aspect of the present invention, by heating and cooling the mold and the optical glass material with a liquid, the heat transfer efficiency between the mold and the optical glass material is good, and the temperature control is improved. It is easy to heat and cool the mold and the glass in a very short time, and the productivity of the molding process of the optical glass element can be improved. According to the second or third aspect of the present invention, the molding method of the first aspect of the present invention can be efficiently performed, and the optical glass element can be formed with high precision. According to the invention according to claim 3,
In addition to the above effects, the flow rate of the liquid is adjusted, the mixing ratio between the high-temperature liquid and the low-temperature liquid is changed, the temperature change of the mixed liquid is adjusted, and the molding surface of the optical glass element is prevented from sinking. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical glass element forming apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a sleeve according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an optical glass element forming apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a top view of a sleeve according to Embodiment 2 of the present invention.

FIG. 5 is a longitudinal sectional view of a conventional optical element molding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 4 Optical glass material 8 Heat transfer medium

Claims (3)

[Claims] An optical glass material is placed between a pair of molds, and the mold and the optical glass material are simultaneously heated to soften the optical glass material, and then the mold is pressed to press the optical glass. After molding the material and cooling the mold and the molded optical glass element, in the method for molding an optical glass element, which removes the optical glass element by releasing the mold, at least directly heat the mold with a high-temperature liquid. And a cooling method for cooling at least the mold with a low-temperature liquid. 2. An optical glass material is disposed between a pair of molds, and the mold and the optical glass material are simultaneously heated to soften the optical glass material, and then the mold is pressed to press the optical glass material. After molding the material and cooling the mold and the molded optical glass element, the mold is released and the optical glass element is taken out. A heating / cooling mechanism for heating and cooling the mold and the optical glass material, and a liquid temperature adjusting mechanism for adjusting the temperature of the liquid from a temperature below the strain point to a temperature ranging from the molding temperature to the optical glass material. Characteristic molding device for optical glass elements. 3. A heating tank for heating the liquid, a cooling tank for cooling the liquid, and an amount of the liquid from the heating tank and an amount of the liquid from the cooling tank sent to the heating and cooling mechanism. 3. A molding apparatus for an optical glass element according to claim 2, further comprising a flow control valve for controlling the flow rate of the optical glass element.