KR20080028298A - Package and method of manufacturing optical elements - Google Patents

Abstract

A package and a manufacturing method of optical elements are provided to enable a user to handle plural preforms easily at a low cost and to manufacture various optical elements with a precise press molding method. Plural receiving concave portions are arranged on a tray body. An outer circumference wall is installed along the outer circumference of the tray body. Plural trays(10) made of a flexible material are stacked through the outer circumference wall of the tray body. The trays are stacked in the state that objects to be received are received into the receiving concave portions, and then are packed by a film material(30). The corner of the lower end portion of the wall of the outer circumference of the tray is supported by the corner of the upper end portion of the outer circumference of the tray disposed below.

Description

Manufacturing method of package and optical element {PACKAGE AND METHOD OF MANUFACTURING OPTICAL ELEMENTS}

The present invention relates to a package suitable for accommodating and packing a preform for precision press molding for producing a glass optical element such as a glass lens by precision press molding, and the like, for example. The manufacturing method of the optical element which manufactures an optical element from the accommodated and packaged preform.

As a technique for producing highly functional optical elements such as aspherical lenses under excellent productivity, a method called precision press molding (or mold optical method) is known. Such a method is, for example, as described in Patent Document 1, by preparing a preform made of optical glass, heating and softening the preform, and press molding by applying a high pressure in a relatively high viscosity state. The molding surface of the press-molded die is accurately transferred to form optical functional surfaces such as lens surfaces and the shape of the entire optical element.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-29763

By the way, since the precision press molding method aims at forming an optical function surface without performing a grinding | polishing process, when there is damage to the surface of a preform, the damage will remain in the optical function surface of the obtained optical element in that state. There is concern. Therefore, it is necessary to pay careful attention to the handling so that the surface of the preform provided to the precision press molding method is not damaged.

On the other hand, since the precision press molding method is a technique developed for the purpose of mass-producing high-performance optical elements at low cost, it is necessary to handle a large number of preforms in a low cost and trouble-free manner.

Thus, the handling of the preform requires sufficient care not to damage the preform. However, in the case of carrying a costly and troublesome packing during the transportation of the preform, high-performance optical elements can be mass-produced at low cost. There is a problem that the advantages of the press molding method are impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is made by containing and packing a large number of preforms at low cost and by simple means, whereby a package that can facilitate handling of the preforms, and such packaging It aims at providing the manufacturing method of the optical element which takes out a preform from a sieve, and precisely press-forms to an optical element.

The package according to the present invention has a tray main body in which a plurality of receiving recesses are provided in a predetermined arrangement, and surrounds the receiving recesses so as to be laminated through an outer circumferential wall provided along the outer circumference of the tray main body. A plurality of trays are laminated in a state in which the object to be accommodated is accommodated in all or a part of the accommodation recesses, and is integrally packaged with a film material.

According to the package according to the present invention having such a configuration, a large number of preforms can be accommodated and packed with low cost and simple means to facilitate handling of the preforms.

In addition, the package according to the present invention can be configured such that the lower end edge of the wall of the outer circumference is supported by the upper end edge of the outer circumference wall provided in the tray located immediately below.

With such a configuration, it is possible to prevent each stacked tray from shifting in the horizontal direction.

Moreover, the package body which concerns on this invention can be set as the structure by which the to-be-retained object accommodated in the said tray was pressed by the tray laminated | stacked directly on it.

With such a configuration, the preform can be packed in a state where the preform is fixed in the accommodation recess.

In addition, the package according to the present invention can have a structure in which a protective member made of a flexible material is further laminated on the tray in which the object to be accommodated located at the top is accommodated.

With such a configuration, it is possible to prevent the object contained in the uppermost tray from directly contacting the film material, thereby effectively avoiding a problem such as damage to the object.

Moreover, the package which concerns on this invention can be set as the structure which made the said tray which the object to be accommodated is not the said protection member.

With such a configuration, it is not necessary to separately prepare a protective member in which the size, shape, or the like is suitable for the tray.

Moreover, the packaging body which concerns on this invention can be set as the structure which the circumference | surroundings of the said tray laminated | stacked and packed with the said film material are in a reduced pressure state.

In such a configuration, the film material is fixed to the trays and the tray and the protection member by the pressure difference between inside and outside, and the preforms between them are also fixed and can be packed in that state.

Moreover, the packaging body which concerns on this invention can be set as the structure by which the said antistatic process is given to the said tray.

With such a configuration, it is possible to prevent the tray from charging and attracting dust.

In addition, the package according to the present invention can be configured to be a glass preform to be used for precision press molding, and the optical element manufacturing method according to the present invention includes a glass preform taken out from such a package. It is a method of precision press molding by using.

As described above, according to the present invention, a number of preforms can be easily handled by a low cost and simple means, and as a result, without compromising the advantage of being able to mass-produce high-performance optical elements at low cost, An optical element can be manufactured by the precision press molding method.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings.

[Packaging]

First, the package embodiment which concerns on this invention is described.

1 is an explanatory view showing the outline of the package according to the present embodiment, and a plurality of preforms 40 of the same shape and the same weight are accommodated and packed in the package 1.

In the package 1 shown in Fig. 1, a plurality of trays 10 are laminated in a state in which the preform 40 for precision press molding is accommodated as an object to be received, and the entirety of the package 1 It is packaged integrally by.

In such a package 1, the tray 10 includes a tray main body 11 and an outer circumferential wall 12 provided along the outer circumference of the tray main body 11. The tray main body 11 is provided with the some accommodating recessed part 13 which accommodates the preform 40 by predetermined | prescribed arrangement (6 * 6 horizontally and equally spaced at the same interval in the example shown in FIG. 2), and these accommodating recesses The part 13 is all surrounded by the outer peripheral wall 12.

Moreover, in providing the accommodation recessed part 13 in the tray main body 11, it is preferable to provide the partition part 13a which partitions between the adjacent accommodation recessed parts 13 ,. In this way, the contact between the preforms 40 accommodated in each of the adjacent receiving recesses 13 can be avoided, and damage due to the contact can be prevented.

2 is a perspective view showing an outline of the tray 10, and FIG. 3 is a sectional view taken along line A-A in FIG.

In this embodiment, although the tray 10 is laminated | stacked through the outer peripheral wall 12, in the example shown in figure, the outer peripheral wall of the tray 10 located in the upper direction among the two trays 10 adjoining up and down. The tray 10 in which the preform 40 is accommodated so that the lower edge 12b of the 12 is coupled to and supported by the upper edge 12a of the outer circumferential wall 12 of the tray 10 located immediately below it. On the other tray, the other tray 10 is laminated | stacked. As a result, the stacked trays 10 can be prevented from shifting in the horizontal direction. For this purpose, as shown in the drawing, the side surfaces of the outer circumferential wall 12 are shaped to spread out, and the thickness thereof is fixed. It is desirable to make it.

In addition, the outer circumferential wall 12 functions as a rib for increasing the strength of the tray 10, and when the plurality of trays 10 are stacked, a space in which the preform 40 is accommodated is provided in the tray 10. It also functions as a spacer for securing between the holes.

In functioning the outer circumferential wall 12 as a spacer, the rear surface of the receiving recess 13 is located above the lower edge 12b of the outer circumferential wall 12, and at the same time, It is preferable that the partition part 13a formed in between is made lower than the top part of the preform 40 accommodated in the accommodation recessed part 13. In this way, the preform 40 accommodated in the tray 10 is stacked on the tray 10 (more specifically, at the bottom of the bottom of the accommodation recess 13 in the tray 10). To be pressed, the preform 40 can be packed in a fixed state in the receiving recess 13.

In addition, the tray 10 is made of a material having flexibility (cushionability) and prevents problems such as damage to the surface of the preform 40 due to contact with the preform 40. As such a flexible material, what is generally used as a buffer material, such as expanded polystyrene, expanded polypropylene, and expanded polyethylene, can be illustrated. It is preferable that the tray 10 be integrally molded with a sheet material composed of these materials by vacuum molding or the like from the viewpoint of manufacturing efficiency and cost management, and as the material for integrally molding the tray 10 by vacuum molding, in particular, Expanded polystyrene is preferred.

When the plurality of trays 10 are stacked in a state where the preform 40 is accommodated, if the preform 40 accommodated in the uppermost tray 10 is in direct contact with the film material 30, There is a fear that problems such as damage to the surface may occur. For this reason, it is preferable to further laminate | stack the protective member 20 which consists of flexible materials, such as the tray 10, on the tray 10 located in the uppermost stage among the tray 10 in which the preform 40 was accommodated and laminated | stacked. .

As the protection member 20, it can be set as plate shape of the magnitude | size and shape which enters inside the outer peripheral wall 12 of the tray 10, and covers the whole of the preform 40 accommodated, for example, In the example to be used, the empty tray 10 is used as the protective member 20. That is, the empty tray 10 in which the preform 40 is not accommodated is laminated on the uppermost tray 10 in which the preform 40 is accommodated. In this way, it is not necessary to separately prepare the protective member which made the size, shape, etc. suitable for the tray 10.

Since the whole package 1 is packaged integrally by the film material 30, the surroundings of the tray 10 are put into a reduced pressure, and the package 1 is laminated | stacked in the state which accommodated the preform 40. As shown in FIG. It is preferable to pack the tray 10 under reduced pressure with the film material 30.

In the decompression pack, first, the trays 10 containing the preforms 40 are stacked in the total number or part of the housing recesses 13 by the number determined in consideration of conveyance (as a target, a maximum of 20 steps). Degree). At the same time, the protective member 20 (empty tray in the illustrated example) is further laminated on the tray 10 located at the uppermost end thereof, and these are placed in the film member 30 made of a bag (Fig. 4). Reference).

Subsequently, air or the like present in the film material 30 is sufficiently degassed by using a vacuum packing machine to make the periphery of the tray 10 into a reduced pressure state, and the film material 30 is sealed in that state to pack it under reduced pressure. . As a vacuum packing machine, a commercial nozzle type vacuum packing machine and a chamber type packing machine can be used.

4 is explanatory drawing which shows the outline of one process of a pressure reduction pack.

As for the package 1 which decompressed-packed, the film material 30 press-fixes the tray 10 and the tray 10 and the protection member 20 by the pressure difference between inside and outside. Thereby, the preform 40 in between them is also fixed and it will be packed in that state.

Here, since the preforms 40 accommodated in each of the trays 10 adjacent to each other up and down are pressed against each other through the tray 10, the tray 10 has a certain degree in order that the function as the cushioning material is not impaired. Needs the thickness of. It is preferable that the thickness of the tray 10 is at least 0.5 mm or more, More preferably, it is 1.0 mm or more. However, when the tray 10 is unnecessarily thick, not only the material cost increases but also the volume at the time of packing increases and the transportation cost also increases, so that the thickness of the tray 10 is preferably 2.0 mm or less.

In addition, the preform 40 needs to be kept in a clean state, and a clean environment is also required in an environment where precision press molding is performed. Also from this point, it is preferable to seal the package 1 with a pressure-sensitive pack, and it is preferable that the tray 10 be subjected to an antistatic process. By performing an antistatic process on the tray 10, it is possible to prevent the tray 10 from being charged and attracting dust, which is clean and precise press molding in a state in which the preform 40 is placed on the tray 10. It is possible to send.

At this time, you may perform the same antistatic process to the protection member 20 and the film material 30. FIG. As an antistatic process, a well-known processing method can be applied.

In addition, the tray 10 is made of a flexible material and has appropriate flexibility. For this reason, it deform | transforms suitably at the time of a pressure reduction pack, and a clearance gap arises between the trays 10, and the tray 10 and the protection member 20, and degassing between them can be performed easily. As described above, in the decompression facsimile, since the tray 10 is deformed appropriately to facilitate degassing, grooves and holes or the like that may cause a decrease in strength may be provided in the tray 10 to promote degassing. no need.

In addition, if the tray 10 is thick and stiffness is higher than necessary, degassing of the reduced pressure facsimile may be difficult. However, in consideration of this point, it is preferable to set the thickness of the tray 10 in the above-described range. Do.

Moreover, in the film material 30, it is preferable to put together drying agents 50, such as a silica gel, and to vacuum-pack. After filling the inside of the film material 30 with dry gas, you may pack under reduced pressure, and in this case, the desiccant 50 may be put in the film material 30. FIG.

By doing in this way, the water vapor | steam contained in the film material 30 condenses on the surface of the preform 40, and it can prevent that the surface of the preform 40 deteriorates. Such an aspect is especially effective when sending the package 1 packaged in a reduced pressure to cold districts or by air transportation.

In this embodiment, the preform 40 as a to-be-retained object is produced using the optical glass which satisfy | fills optical characteristics, such as the refractive index of the target optical element, Abbe's number, and the like.

For example, in order to obtain a predetermined optical glass, the glass raw materials are combined, heated and melted, foamed by a clarification process, stirred and sufficiently homogenized, then cast into a mold and molded, and subsequently Anneal, if necessary, cut to an appropriate size, and then grind and polish to form a preform of one weight of a precision press-molded product, or melt glass flows out of a glass outflow pipe, The molten glass agglomerates are separated, and the molten glass agglomerate can be produced by a method of molding into a preform while floating on a molding die with a blowing gas until the molten glass agglomerates are cooled and solidified.

As the shape of the preform, in addition to the spherical shape as shown in the figure, it has one rotational symmetry axis, is symmetrical with respect to rotation of any angle around the axis, and is an outwardly convex shape, for example, a flat sphere and a marble shape. It can be exemplified in the shape as follows.

In the precision press molding, depending on the relationship between the curvature of the surface of the preform 40 and the curvature of the molding surface of the press molding die, a phenomenon called gas trap, that is, between the preform 40 and the mold molding surface In some cases, a phenomenon may occur in which an atmospheric gas is trapped, which may interfere with the filling of the glass. Therefore, in the case of a preform having a surface having a different curvature depending on a portion such as a flat shape or a marble shape, the orientation of the preform 40 disposed on the tray 10 is made constant (for example, in all preforms). In this case, it is desirable to face the large curvature upwards). Thus, by making the direction of the preform 40 constant, if all the preforms 40 on the tray 10 are sent to the post process in a predetermined orientation, gas traps can be effectively avoided in all the precision press molding. Can be.

In addition, depending on the material of the press-molding die to be used, the kind of the release film provided on the mold-forming surface, and the kind of glass constituting the preform 40, the surface of the preform 40 is well-known. A carbon containing film or a self-organizing film can be coated. When such a coat is applied, the friction between the glass and the mold can be reduced during elongation of the press, and the glass can be easily stretched. However, the preform 40 may be one in which the glass forming this is exposed.

In addition, the specification of the preform 40 accommodated and packaged in the package 1, for example, the item name, shape, weight, etc. of the glass used are accommodated in the at least one tray 10 so that they may be easily distinguished. It is preferable to make the same specification in the whole preform 40 used, and it is more preferable to make the specification of all the preforms 40 accommodated and packed in one package 1 the same.

[Method for Manufacturing Optical Element]

Next, the manufacturing method embodiment of the optical element which concerns on this invention is described.

In this embodiment, the preform 40 is taken out from the package 1 as described above, and precise press-molded using this preform 40.

More specifically, first, the plurality of trays 10 stacked by opening the package 1 are taken out, and then the trays 10 are divided one by one and sent to the subsequent step.

At this time, if the preform 40 is in a sufficiently clean state, a carbon-containing film, a self-organizing film, or the like is coated on the surface of the preform 40 as necessary and sent to the precision press molding step. When the preform 40 is not sufficiently clean, it is sent to a washing | cleaning and drying process to make it a clean state, and a coating process is given to the surface as needed, and it is sent to a precision press molding process.

In addition, when necessary coat | treatment process is already performed, you may make it send it to the precision press molding process in the state or after purifying.

In addition, in these processing operations, when the orientation of the preform on the tray 10 is made constant, it is preferable to operate so that those orientations may be in an unchanged state.

Precision press molding is also called mold optical molding. In an optical element, an optical function surface (a lens surface such as an aspherical surface of an aspherical lens or a spherical surface of a spherical lens, etc.) may be an optical function surface that transmits, refracts, diffracts, or reflects light. According to the precision press molding, an optically functional surface can be formed by press molding by precisely transferring the molding surface of the press molding mold to glass. For this reason, it is not necessary to apply machining, such as grinding and polishing, in order to finish an optical function surface.

Such precise press molding is suitable for the production of optical elements such as lenses, lens arrays, diffraction gratings, prisms, and the like, and is particularly suitable as a method for producing aspherical lenses under high productivity.

As a press molding mold used for precision press molding, a well-known thing can be used, for example, the thing which provided the release film in the shaping | molding surface of the shape member of heat resistant ceramics, such as silicon carbide, zirconia, and alumina, can be used. Among these, press-molding dies made of silicon carbide are preferred. Moreover, although a carbon containing film etc. can be used as a mold release film, a carbon film is especially preferable from a viewpoint of durability and cost.

In the precision press molding, in order to keep the molding surface of a press molding die in a favorable state, it is preferable to make the atmosphere at the time of shaping | molding into a non-oxidizing gas. As the non-oxidizing gas, nitrogen, a mixed gas of nitrogen and hydrogen, and the like are preferable.

As a specific form of the precision press molding applicable in this embodiment, the following two things can be illustrated.

[First sun]

In this embodiment, the preform 40 is introduced into the press molding die, and the press molding mold and the preform are heated together, followed by precision press molding, and both the temperatures of the press molding mold and the preform 40 are adjusted. It is preferable to heat at the temperature which the glass to form shows the viscosity of 10 <^6> -10 <^12> dPa * s, and to perform precision press molding. After the press, it is preferably 10 ¹² dPa · s or more, more preferably 10 ¹⁴ dPa · s or more, more preferably 10 to ¹⁶ dPa · s or more, and then cooled to a temperature exhibiting a viscosity. Is taken out from the press-molding die.

According to such conditions, the shape of the molding surface of the press-molded die can be transferred to the preform 40 more precisely, and can be taken out without deforming the precision press-molded product. In addition, when a plurality of sets of press-formed molds are used to introduce the preform 40 into each press-formed mold, and to perform precision press molding sequentially, a large number of optical elements can be mass-produced with good productivity.

[Second sun]

This aspect introduces the preform 40 heated in the preheated press molding die, and performs precision press molding. According to this aspect, since the preform 40 is heated before introduction into a press-molding die, it is possible to manufacture an optical element having good accuracy without surface defects while shortening the cycle time.

In such an aspect, the preheating temperature of the press-molded die is preferably set lower than the preheating temperature of the preform 40. As such, by lowering the preheating temperature of the press-molding die, the consumption of the press-molding die can be reduced.

In this aspect, first, the preform 40 is sent to a preheating step, and the preheated preform 40 is introduced into a press molding die for precision press molding. At this time, it is preferable that the glass which forms the preform 40 preheats the preform 40 at the temperature which shows the viscosity of 10 ⁹ dPa * s or less, and it preheats, making the preform 40 float while preheating. desirable. And it is preferable to start cooling simultaneously with press start or from the middle of a press.

Further, in performing a precision press-molding in this manner, the press temperature of the mold, the preform 40 is preheated temperature than the temperature control at a low temperature, the preform 40 is free of 10 ⁹ to 10 ¹² dPa of forming the What is necessary is to aim at the temperature which shows the viscosity of s. Also, it is preferable that after the press forming, then the viscosity of the glass to cool to less than 10 ¹² dPa · s release.

In each said aspect, the molded article precise-press-molded is taken out from a press molding die, and is cooled as needed. When a molded article is an optical element, such as a lens, you may coat an optical thin film on the surface as needed, and may perform centering processing suitably, and may have a shape as an optical element.

The empty tray from which the preform 40 is taken out is stacked and returned to the preform production process, and is used for accommodating and packing the newly produced preform. In addition, if the film material 30 is also produced and used by the sealing bag with a chuck, etc., it is not disposable but can be used repeatedly like the tray 10. FIG. Waste can be reduced by using such a recycled tray or film material.

EXAMPLE

Next, the present invention will be described in detail with reference to specific examples.

First, a tray made of expanded polystyrene as shown in Figs. 2 and 3 was vacuum molded. The thickness of the tray was 1 mm, and the surface of the tray was subjected to antistatic processing. In this way, after preparing many trays, the preform was produced.

In producing the preform, firstly, the glass composition has optical properties such as refractive index, Abbe's number required for the optical element to be obtained, and has a predetermined glass transition temperature so as to lower the temperature during precision press molding. The glass raw material was weighed, mixed sufficiently, and it was set as the combination raw material.

Next, the combination raw material was put into the melting tank, and it heated and melted and obtained the molten glass. And after sending the obtained molten glass to a clarification tank, removing a bubble, sending it to a working tank, stirring, and fully homogenizing, the molten glass was flowed out continuously from the glass outflow pipe. The molding die was kept under the pipe, and in this molding die, the lower end portion of the molten glass flowing down was supported to form a cutout in the middle of the molten glass flow, and the molding die was dripped at a predetermined timing. Under the present circumstances, the part lower than the narrow part of the molten glass flow separated by the surface tension, and the molten glass lump was formed on the shaping | molding die. The shaping | molding die was provided with many gas ejection openings, and it shape | molded with the preform in the state which floated the molten glass lump by the gas ejected from these ejection openings.

As mentioned above, the flat spherical preform was shape | molded sequentially from the molten glass which flows out continuously using several shaping | molding dies.

After cooling sufficiently on a shaping | molding die, the preform was taken out, and the surface with a large curvature was faced down, and it was loaded and cooled by the heat-resistant tray for cooling. The cooled preform was sequentially transferred to the accommodating recess of the tray made of expanded polystyrene, but at this time, the preform was loaded so that the surface having the large curvature faced downward.

Preforms were accommodated in each of the receiving recesses of the tray one by one, and after one tray was filled with the preforms, the preforms were accommodated in separate trays. By repeating such an operation, a plurality of trays containing preforms were obtained. These trays are laminated, and an empty tray is further laminated on the uppermost tray, and a vinyl film is formed into a bag, which is put together with a silica gel put in a moisture-permeable bag in advance to reduce the pressure with a vacuum packing machine. To pack.

In addition, the silica gel was placed under the lowermost tray or on the stacked empty trays as a protective member so as not to be in direct contact with the preform.

In this way, the package which received and packed the preform was air-transported and sent to the factory which performs precision press molding. In the case of air transportation, although exposed to a low temperature in the air, since the silica gel is packed under reduced pressure together, condensation on the surface of the preform can be prevented, and deterioration such as pressing on the surface of the preform has not been confirmed. The same effect was also obtained not only by air transportation but also by sending a package to a factory which performs precision press molding in a cold district.

In the factory which performs precision press molding, the package was opened, the preform was taken out on the tray, and the whole surface was coated with the carbon film after washing and drying, making the orientation of the preform constant.

Next, these preforms were heated, and precision press-molded using the press molding die, and many aspherical lenses were manufactured.

In the above-described embodiment, the molded preform is accommodated in the package and packed in that state. However, the cooled preform may be washed and dried, and then packaged and packaged in the package, and the surface of the washed and dried preform is coated. After that, the package may be accommodated and packed. In addition, the washing process may be unnecessary by forming the preform in a clean room.

In addition, although the said Example is shape | molding a preform directly from a molten glass, the molten glass is cast and shape | molded, the obtained glass molded object is annealed, and it cuts to predetermined size, and makes a glass piece called a cut piece. The cut piece may be ground and polished to finish with a preform.

The empty tray which took out all the preforms is laminated | stacked and returned to a preform production site, and is used repeatedly. In this way, a large amount of preforms can be sent to the precision press molding process at a relatively low cost. In addition, since the trays are repeatedly used, there is also an advantage of not making waste.

In addition, although the above-mentioned embodiment demonstrated the flat spherical preform as an example, the same also applies to the spherical preform. In the case of a spherical preform, there is an advantage that the orientation of the preform does not have to be taken into account.

As mentioned above, although preferred embodiment was disclosed and demonstrated about this invention, this invention is not limited only to embodiment mentioned above, It cannot be overemphasized that various changes can be implemented in the range of this invention.

For example, in embodiment mentioned above, the tray 10 laminated | stacked in the state which accommodated the preform 40 was made into the film in the pressure reduction state of the periphery of the tray 10 packaged integrally by the film material 30, and the film is filmed. Although the pressure reduction pack was made by the ashes 30, the present invention is not limited to such a form.

That is, the film material 30 press-fixes the tray 10 and the protection member 20 between trays 10, and by this, the preform 40 between them is fixed and can be packaged in the state. If possible, there is no limitation on the specific aspect in packaging the stacked trays or the like integrally with the film material 30.

As the film material 30, for example, a stacked tray or the like may be integrally packaged using a so-called shrinkable film that is heat shrinkable. At this time, it is not necessary to package the entire stacked tray or the like, and the preform 40 is the package 1 by pressing and fixing the tray 10 and the tray 10 and the protection member 20. As long as it is possible not to move around, at least a part of the stacked tray or the like may be packaged. In addition, the package 1 in which the preform 40 is accommodated and packed in this manner may be box-packed or accommodated in another packaging material or the like (sealed under pressure if necessary).

In addition, in the above-mentioned embodiment, although the example of the glass preform used for precision press molding is mentioned as an object to be received, the object to be applied to this invention may be optical elements, such as a lens, and various things are applicable. At this time, in the present invention, since the object to be accommodated is accommodated on a tray, the object is unsuitable for application to the minute object. For example, when the object is a preform, it is a preform of 100 mg or more by weight. Although it is preferable, even a small to-be-contained object may be accommodated and packed through a suitable jig | tool.

The present invention uses a preform for precision press molding or the like as an object to be accommodated, and a large number of objects to be accommodated are packed and packed with low cost and simple means to facilitate handling thereof.

1 is an explanatory diagram showing an outline of an embodiment of a package according to the present invention;

2 is a perspective view showing an outline of a tray;

3 is a sectional view taken along the line A-A of FIG.

4 is an explanatory diagram showing an outline of one step of a pressure reduction pack;

<Explanation of symbols for the main parts of the drawings>

1: package

10 tray

11: tray body

12: outer wall

12a: top corner

12b: bottom corner

13: receiving recess

20: protection member

30: film material

40: preform (captured matter)

Claims (9)

A plurality of trays made of a flexible material having a tray main body provided with a plurality of receiving recesses in a predetermined arrangement and surrounded by the receiving recesses and laminated through an outer circumferential wall provided along the outer circumference of the tray main body, The package body which is laminated | stacked in the state in which the to-be-retained object was accommodated in all or one part of the said receiving recessed part, and is integrally packaged with a film material. The package according to claim 1, wherein the bottom edge of the wall of the outer circumference is supported by the top edge of the outer circumference wall provided in the tray located immediately below. The package according to claim 1 or 2, wherein the object to be accommodated in the tray is pressed by a tray stacked directly thereon. The package according to claim 1 or 2, further comprising a protective member made of a flexible material on the tray in which the object to be accommodated located at the top is accommodated. 5. The package according to claim 4, wherein the tray in which the object is not accommodated is used as the protective member. The package according to claim 1 or 2, wherein the periphery of the tray laminated and packaged by the film material is in a reduced pressure state. The package according to claim 1 or 2, wherein the tray is subjected to an antistatic process. The package of Claim 1 or 2 whose to-be-accepted object is a glass preform used for precision press molding. Precision press molding using the glass preform taken out from the package of Claim 8, The manufacturing method of the optical element characterized by the above-mentioned.

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