JP2008039852A - Glass optical element and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass optical element improved in durability of an optical film and assembling precision to optical equipment. <P>SOLUTION: On a rectangular plate-like lens array 1, two principal planes as light transmission faces 2 and 3 are formed, and a cell-like lens 5 are formed on one light transmission face 2. The lens array is provided with: a metal mold processing face 7 molded by metal mold processing composing some of four end faces; a division face 8 division-processed by cutting or breakage composing the remaining end face except for the metal mold processing face 7; and an anti-reflection film 12 formed partly on the other light transmission face 3 by spacing a prescribed interval from the division face 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glass optical element such as a lens array used in an optical system of a liquid crystal projector, for example, and a manufacturing method thereof.

  A lens array, also called an integrator lens or fly-eye lens, is formed by pressing, for example, glass in a softened state one by one with a mold in which the shape of the lens array is engraved in a matrix, and then the surface on which the lens is not engraved. By polishing, for example, a rectangular plate shape is formed. In most cases, a lens array can be obtained by forming an antireflection film on the polished surface of the rectangular glass substrate by a method such as vacuum deposition. In the lens array manufactured as described above, for example, unevenness is formed on the end surface of the mold, and this uneven portion is used as an engaging portion when assembled to an optical apparatus.

  On the other hand, projectors using such a lens array as an optical component are used for business use from presentations to general households with the spread of video-related equipment such as personal computers and DVD drives. Is expanding. Along with this, miniaturization of the projector itself has been promoted. For example, a spheroid reflector is used as a light source reflector, and the light from the light source is made into a thin parallel light beam by combining the condensing optical system, and a small display element such as an optical component or a liquid crystal device in the subsequent stage is used. By using it, the size of the projector is reduced. Optical components such as a lens array used in such an apparatus are required to be miniaturized, and at the same time, cost reduction is required.

  Therefore, in order to meet such demands, a plurality of lens arrays are adjacent to each other instead of repeatedly performing molding, polishing, and film formation while cleaning each of the manufacturing methods described above, that is, for each lens array. In a state where the lens array is integrally molded and divided into each lens array after molding, or a plurality of integrally molded lens arrays are integrally coated on one or both sides, and then each lens array The manufacturing method of dividing is proposed (for example, refer to Patent Document 1).

  In addition, a concave portion to be a lens portion is formed for each piece on one surface of a glass substrate having a size corresponding to a plurality of pieces of a flat microlens array, and then the concave portion is filled with a high refractive index resin to form a lens portion. Then, a method of cutting into a size for one piece has been proposed (for example, see Patent Document 2).

  Here, when the lens array is built in the projector, the light transmission surface of the lens array needs to be accurately arranged with respect to the optical axis. If there is a deviation between the center of the lens array and the center of the optical axis, or an angular deviation of the lens array in the vertical and horizontal directions with respect to the optical axis, an accurate optical path cannot be obtained, the light use efficiency is extremely reduced, and the projected image is reduced. Get dark. In this case, inconvenience such as uneven illuminance occurs.

  Further, in a projection type projector, two lens arrays having different illuminance distributions are provided apart from each other on the optical path in order to eliminate unevenness in illuminance of the projected image. In addition to those that are incorporated by bonding with other optical elements, there are those that are assembled on the optical path using the end face of these lens arrays as a reference plane.

  When the end surfaces of the lens array are used as reference surfaces, the shape accuracy of these end surfaces is important. As described in Patent Documents 1 and 2, when individual lens arrays are cut out from a substrate in which a large number are integrally formed by cutting, the cutting accuracy directly affects the optical accuracy. When the cut surface is inclined, the angle of the light transmission surface with respect to the optical axis is shifted, and variations in the cutting position cause a shift between the center of the lens array and the optical axis. In any case, as long as it depends on post-processing such as cutting, it is difficult to eliminate processing variations. If centering on the outer periphery of the product is premised, a cutting margin is required to maintain the distance from the end surface to the center of the lens array at a predetermined value, so that the molding efficiency decreases accordingly. It will be.

  In particular, in the case of Patent Document 1, if the cut surface is used as it is for positioning, the distance between the center of the optical axis of the lens and the cut surface serving as the positioning surface must be accurately measured and cut. Due to variations in molding pitch and cutting accuracy, it is difficult to perform accurate positioning.

In order to solve the above problems, a new method for manufacturing a lens array has been proposed (see, for example, Patent Document 3). In the manufacturing method of Patent Document 3, by using two adjacent end surfaces formed by a mold among the four end surfaces of the lens array as reference surfaces for mounting, this mold processing surface with relatively high accuracy is used. Accurate positioning and assembly can be performed. Further, in the manufacturing method of Patent Document 3, for example, four lens arrays are integrally molded by a mold using a softened glass material, and polishing is performed in a molded body in which the four lens arrays are integrated. In addition, the film forming process facilitates handling and reduces man-hours and processing costs.
JP 2000-37787 A JP-A-9-90360 JP 2005-107410 A

  However, it has been found that when the film forming process is performed in the state of a molded body in which a plurality of lens arrays are integrated, the lens array is separated for each lens array by cutting or breaking. That is, in the method of Patent Document 1 or Patent Document 3, a coating layer such as an antireflection film formed on the lens array is formed because the lens arrays are cut or broken after being formed on the integrally formed lens array. Are simultaneously cut or broken. For this reason, the divided end portions of the coat layer are in a state where the film is rough, and the adhesion with the lens array body is reduced.

  On the other hand, since a lens array built in a liquid crystal projector or the like is disposed in the vicinity of a light source, it receives heat from the light source and becomes high when in use, and is cooled to room temperature when not in use. As this cooling cycle is repeated, moisture in the atmosphere penetrates into the gap between the edge of the coat layer and the lens array body, causing film peeling and film cracks from the edge of the coat layer, resulting in stable long-term quality. May be impaired.

  Therefore, the present invention is to solve such a conventional problem, and can improve the accuracy of assembly to an optical device, improve the durability of the optical film, and provide stable optical quality over the long term. An object of the present invention is to provide a glass optical element that can be maintained and a method for manufacturing the same.

  The glass optical element of the present invention is a rectangular plate-like glass optical element in which two principal surfaces are each configured as a light transmission surface, and a cellular lens is formed on at least one of the light transmission surfaces, and has four end surfaces. A die machining surface formed by die machining that constitutes some of the above, a sectional surface that is divided by cutting or breaking that constitutes the remaining end surface excluding the die machining surface, and from the sectional surface And an optical film partially formed on at least one light transmission surface at a predetermined interval.

  According to the present invention, since the optical film on the light transmission surface is formed at a predetermined interval from the dividing surface, the physical influence by cutting or breaking when the dividing surface is processed and molded is optical. It is possible to avoid reaching the membrane. As a result, the optical film including the edge portion can maintain the film formation state as a whole film. For example, even in a use environment where the film is exposed to high temperatures, it is difficult to cause film peeling and film cracking. Stable optical quality can be maintained.

  Here, in the rectangular plate-shaped glass optical element of the present invention, it is preferable that two predetermined end faces adjacent to each other among the four end faces are configured by the divided sections, and the remaining two adjacent ones are adjacent to each other. It is desirable that the two end surfaces are constituted by the mold processing surface.

  Further, in the present invention, the glass of the present invention can be obtained by utilizing a part of the die processing surface as a reference surface for positioning to obtain a high processing accuracy by molding. Accurate positioning and assembling to an optical device such as a projector that should incorporate the optical element can be realized. In particular, the rectangular plate-shaped glass optical element is formed by forming two adjacent end surfaces of the four end surfaces as a die processing surface and forming a part of the die processing surface as a positioning reference surface. The angular deviation of the cellular lens in the direction along the surface of the glass optical element can be prevented. In addition, it is desirable to mold the reference surface and the cellular lens integrally. With such a configuration, the cellular lens on the glass optical element can be more accurately arranged with respect to the optical axis in the projector described above, so that a clear projection image with improved light utilization efficiency can be obtained, In addition, the occurrence of uneven illuminance can be suppressed.

  Further, by forming the mold processing surface including the above-described reference surface as an uneven surface, it is possible to more suitably perform positioning and assembly with respect to the above-described projector or the like.

  Further, since the end surface other than the die processing surface having the above-described reference surface, that is, the sectional surface is not used for positioning at the time of assembly, high accuracy is not required, and further, cutting or Since there is no physical influence on the optical film due to breakage, there is no problem even if the film is formed by rough cutting or breakage. This can simplify the production process and reduce the production cost. In addition, in the rectangular plate-shaped glass optical element of the present invention, the corners may be cut out or curved.

  In the present invention, the light transmitting surface on which the cellular lens is formed has a flange portion surrounding the periphery of the cellular lens, and the cellular lens is recessed from the surface of the flange portion. It is preferable that it is formed at a position. By using this flange portion as a grip portion of the glass optical element, for example, the glass optical element can be easily handled in the manufacturing process. Furthermore, since the cellular lens is formed at a position recessed from the surface of the flange portion, for example, even when the glass optical element is placed with the cellular lens side facing downward in the manufacturing process, the lens surface is directly mounted. Since the mounting surface is not touched, the cellular lens is prevented from being stained and damaged. In addition, since the glass optical element having such a configuration can be mounted with the cellular lens side facing downward, for example, the polishing surface or the film formation surface on the light transmitting surface side where the cellular lens is not formed is specially protected. It can be placed directly on a desk or the like, and is easy to handle.

  In the glass optical element of the present invention, it is preferable that at least one side of the dividing surface is chamfered. That is, since the cut surface of the glass is sharp, the end surface formed by cutting or breaking is preferably chamfered, and this chamfering allows glass pieces from the cut surface and the fractured surface to transmit light. This is effective for preventing the light from adhering to the surface or scratching the light transmitting surface. In the present invention, since the optical film on the light transmission surface is formed at a predetermined interval from the dividing surface, the physical influence during the chamfering process described above directly affects the optical film. Thus, chamfering can be easily performed.

  In the glass optical element of the present invention, the cellular lens is formed only on one of the two light transmission surfaces, and the other light transmission surface on which the cellular lens is not formed is provided. It is optically polished, and the optical film is formed on the polished surface. Further, as the optical film, an optical film made of any one of an antireflection film, an ultraviolet cut film, an infrared cut film, or a combination thereof is used.

  For example, when an ultraviolet cut film is formed for the purpose of imparting an ultraviolet cut function to a glass optical element, it is possible to form a film on any one of two light transmission surfaces, but an uneven cell. It is easier to form a film that is more uniform and less affected by the incident angle of light when the film is formed on a plane-polished surface than when it is formed on the surface where the lens is formed. Further, as the optical film, an antireflection film for the purpose of reducing reflection loss by the optical system, an ultraviolet cut film for eliminating the influence on the liquid crystal display element, an infrared cut film or the like is formed according to the purpose. . Further, in the case of forming such an optical film, a film forming method by vacuum vapor deposition or sputtering is preferable in consideration of the optical quality of the film, the durability of the film, and the like. The glass optical element of the present invention can be suitably used for an optical system inside the projector as described above.

  The glass optical element manufacturing method of the present invention is a manufacturing method for manufacturing a rectangular plate-shaped glass optical element in which two principal surfaces are each configured as a light transmitting surface, and one of the light transmitting surfaces has a cellular lens. In addition, press molding is performed by pressing a glass material in a softened state with a mold having a plurality of inverted shapes of the glass optical elements to be manufactured to obtain a molded body in which the glass optical elements for a plurality of pieces are integrally molded. An optical polishing step of optically polishing the other light transmitting surface side of the molded body obtained by the press molding step, where the cellular lens is not formed, and the optical polishing in the optical polishing step A film forming step of masking a predetermined width including a predetermined cutting line for cutting the molded body defined on the other light transmitting surface, and depositing an optical film on the other light transmitting surface masked; Previous in film formation process It characterized by having a a dividing step of dividing each glass optical element along said shaped body is deposited an optical film wherein be cut line.

  According to the method for manufacturing a glass optical element of the present invention, it is possible to perform polishing and film forming processing on a molded article having an easy-to-handle size in a state where a plurality of glass optical elements are integrally molded. Scratches and the like can be reduced, and man-hours and processing costs can be reduced as an advantage of integrated processing. Further, in the present invention, the optical film is deposited by masking a predetermined width including a dividing line for dividing a molded body in which a plurality of glass optical elements are integrally formed into individual glass optical elements. The optical film on the light transmission surface is formed at a predetermined interval from the dividing surface. Thereby, when the molded body is cut or broken into individual glass optical elements along the planned dividing line in the subsequent cutting step, the molded body is cut without affecting the optical film itself at the time of cutting or breaking. be able to.

  In the glass optical element manufacturing method of the present invention, the molded body is arranged in a square shape so that each of the four glass optical elements satisfies a rotationally symmetrical relationship with respect to a predetermined reference position. It is preferable that the molded product is molded. That is, for example, a projector lens array is usually an assembly of cellular lenses having different aspect ratios, and the number of rows and columns is generally different. Therefore, as described above, by arranging four glass optical elements on the molded body so as to be rotationally symmetric with respect to the center position in the direction along the surface of the molded body, after dividing, for the projector Four glass optical elements having substantially the same shape corresponding to the application of the lens array can be obtained.

  In the glass optical element manufacturing method of the present invention, in the press molding step, a flange portion that surrounds the periphery of each cellular lens for each glass optical element is molded, and each cellular lens is molded into the flange portion. Further, in the dividing step, from the side of the other light transmitting surface to which the optical film is applied except for a predetermined width including the planned dividing line, the planned fracture line is formed in the dividing step. It is preferable that the said molded object is divided | segmented for every glass optical element by making a cutting blade contact | abut along.

  By molding the flange portion described above, the molded body can be placed with the optical polishing side or optical film side facing up and the flange portion side facing down, so the surface on the optical polishing side or the optical film side is facing upward Thus, an optical polishing step and a dividing step can be performed, and a glass optical element can be obtained without damaging the polished surface and the optical film. Thereby, when the molded body is cut or broken into individual glass optical elements along the planned dividing line in the subsequent cutting step, the molded body is cut without affecting the optical film itself at the time of cutting or breaking. be able to. Further, in the manufacturing method of the present invention, the cutting blade is brought into contact along the planned fracture line from the light transmission surface side on which the optical film is applied except for the predetermined width including the planned split line, so that the optical film is damaged. The molded body can be divided without any problems.

  As described above, the present invention can improve the assembling accuracy to the optical apparatus, improve the durability of the optical film, and maintain the stable optical quality in the long term, and the manufacturing thereof. A method can be provided.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing a lens array for a liquid crystal projector as a glass optical element according to the first embodiment of the present invention, and FIG. 2 is a plan view thereof. 3 is a cross-sectional view taken along the line AA of the lens array shown in FIG. 2, and FIG. 4 is a detailed view of a portion B in FIG.

  As shown in FIGS. 1 to 4, the lens array 1, which is also referred to as an integrator lens or a fly-eye lens, has a rectangular plate-like outer shape, and two main surfaces are configured as light transmitting surfaces 2 and 3, respectively. On this one light transmitting surface 2, cellular lenses (a plurality of lenses arranged in a cell shape) 5 arranged in 4 rows × 5 columns are formed. Further, a flange 6 surrounding the periphery of the cellular lens 5 is provided on the light transmitting surface 2 side of the lens array 1. The cellular lens 5 is formed at a position recessed from the surface of the flange portion 6.

  In addition, two predetermined end faces adjacent to each other among the four end faces forming the outer edge of the lens array 1 are configured by a die processing surface 7 formed by die processing. On the other hand, of the four end surfaces forming the outer edge of the lens array 1, the remaining two end surfaces adjacent to each other excluding the die processing surface 7 are constituted by a divided section 8 that is divided by cutting or breaking. .

  In addition, a part of the former die processing surface 7 is formed as a positioning reference surface 9. The reference surface 9 is configured to be perpendicular to the light transmission surfaces 2 and 3, that is, to be parallel to the optical axis of light transmitted through the light transmission surfaces 2 and 3. Further, the reference surface 9 is formed as a convex portion that protrudes relatively to the entire die processing surface 7. In addition, the part other than the reference surface 9 of the die processing surface 7 is formed with an inclined surface 10 that is a concave portion relative to the reference surface 9. The inclined surface 10 is slightly inclined toward the center side of the lens array 1 from the light transmitting surface 3 side toward the light transmitting surface 2 side.

  Moreover, as shown in FIGS. 1-4, the chamfering process is given to each ridge part of the divided surface 8 formed by the cutting | disconnection or the fracture | rupture of the lens array 1, and the chamfer part 11 is formed. A chamfered portion such as an R surface or a C surface is also formed at each ridge portion of the die processing surface formed by the die processing. Further, the other light transmitting surface 3 on which the cellular lens 5 is not formed is optically polished, and an antireflection film 12 is formed on the polished surface as an optical film formed by vacuum evaporation or sputtering. ing. The antireflection film 12 is partially formed on the other light transmission surface 3 at a predetermined interval from the dividing surface 8. More specifically, this antireflection film 12 covers at least the formation region of the cellular lens 5 on the light transmission surface 2 side from the light transmission surface 3 side, and from the outer edge (divided section 8) of the light transmission surface 3 to a predetermined area. The film is formed leaving a non-deposition portion (see non-deposition portion 26 in FIG. 10B), which will be described later, having an interval, for example, a width of about 1 to 2 mm.

  A typical size of the lens array 1 for projectors is exemplified. The lens array 1 is 40 to 70 mm square, the cell size is 3 to 5 mm, the cell aspect ratio is 4: 3 to 16: 9, and the like. The width of the outer peripheral flange portion 6 is about 2 to 4 mm. Needless to say, the lens array 1 having a size of about 20 mm to 40 mm is also applicable.

  Such a lens array 1 is used by being incorporated in an optical system of a projector as follows, for example. For example, a frame made of a metal sheet metal part or molded part having an opening corresponding to the outer size of the lens array 1 viewed from the light transmitting surfaces 2 and 3 side is prepared. Further, the frame body is provided with a predetermined positioning surface on the inner surface thereof. The frame body is provided with pressing and fixing components for pressing and fixing the reference surface 9 of the lens array 1 against the positioning surface, such as a plate spring, a coil spring, and a bolt. In order to firmly fix the reference surface 9 of the lens array 1 to the positioning surface of the frame body, an adhesive may be used in addition to the pressing and fixing component. The frame body in which the lens array 1 is fitted into the opening using such a pressing and fixing component or an adhesive is aligned with the optical axis of other optical components on the optical path of the optical system of the projector. It is positioned and fixed accurately. In addition, the slope 10 formed on the die machining surface 7 may be engaged with an engagement piece provided on the frame so as to be fitted to the slope 10.

  In the lens array 1 of the present embodiment, the mold processing surface 7 having the reference surface 9 and the cellular lens 5 are integrally formed by a mold. Thereby, since the distance from the reference surface 9 to the cellular lens 5 is determined by the precision of the mold, high part precision can be obtained. Therefore, by aligning the reference surface 9 of the lens array 1 with the positioning surface of the frame, the cellular lens 5 on the lens array 1 can be positioned at a desired position with high accuracy.

  1 to 4, the convex portion of the die machining surface 7 is applied as the reference surface 9, but the concave portion can also be used as the reference surface. Further, as shown in FIGS. 1 and 2, the reference plane 9 is provided with two or more positions on one end face with an interval, thereby improving the alignment accuracy. The slope 10 of the die processing surface 7 is also a draft angle of the die in press molding.

  The dividing surface 8 is desirably a surface parallel to the reference surface 9 on the opposite side. However, if the pressing force capable of bringing the lens array 1 and the positioning surface of the frame body into close contact with each other can be received, the reference surface can be obtained. The surface may not be parallel to 9.

  Next, a method for manufacturing the lens array 1 according to the present embodiment will be described in the order of production of a glass material, a mold, a press molding process, a polishing process, an antireflection film forming process, and a dividing process.

[Production of glass material]
Prepare a glass material 1.3 to 5 times the product weight in advance. This glass material is obtained by a method in which glass melted by a known method is cast into a mold, or continuously drawn from a melting furnace, formed into a rod shape, and cut into an appropriate length. Since the projector lens array 1 is disposed near the light source as described above and becomes high temperature, the comparison is performed in order to ensure the heat resistance of the glass itself so that the thermal expansion due to the temperature change does not affect the optical characteristics. Low expansion glass is applied. Here, in consideration of the meltability of glass, the shape transferability by press molding, and the like, a borosilicate glass having an average linear expansion coefficient of about 30 × 10 ⁻⁷ / ° C. to 45 × 10 ⁻⁷ / ° C. is preferable. Glass having an average linear expansion coefficient of up to about 100 × 10 ⁻⁷ / ° C. can be used. However, in this case, in order to increase the mechanical strength and heat resistance strength of the glass, it is preferable to perform air cooling strengthening. The air-cooling strengthening at this time is preferably performed after separating the molded body into each lens array, since the glass may be broken when it is cut after the strengthening treatment. In this embodiment, borosilicate glass having an average linear expansion coefficient of 32 × 10 ⁻⁷ / ° C. is used as the glass material.

[Mold]
Next, the metal mold | die used by press molding is demonstrated based on FIG. 5A-FIG. 7B. Here, FIG. 5A is a cross-sectional view of the mold 14 used for molding the lens array 1, and FIG. 5B is a bottom view of the upper mold 15 constituting the mold 14. FIG. 6 is a cross-sectional view schematically showing the state of the mold 14 shown in FIG. 5A during press molding. Further, FIG. 7A is a cross-sectional view showing a mold structure suitable for molding the lens array 1 in which the central part of the cellular lens has a convex shape, and FIG. 7B shows the concave part of the central part of the cellular lens. It is sectional drawing which shows the structure of a metal mold | die suitable when shape | molding the lens array 1 used as a shape.

  As shown in FIG. 5A, the mold 14 includes an upper mold 15 and a lower mold 16. Further, as shown in FIGS. 5A to 6, the mold 14 has a plurality of inverted shapes of the lens array 1 to be manufactured (4 × 2 in the example of FIG. 5B), and is a softened glass material. Is pressed to obtain a molded body 20a, which will be described later, in which a plurality of lens arrays 1 are integrally molded. The upper mold 15 includes a plunger 18 having a plurality of lens molding surfaces 17 for molding the cellular lens 5 and a ring 19 that forms the mold processing surface 7 of the lens array 1.

  The press portion of the ring 19 of the upper die 15 that determines the product thickness in cooperation with the lower die 16 is set to a height slightly higher than the desired product thickness. For example, this height is set to about 3 mm when the product thickness is 2.5 mm. The excess thickness in the shaped body is later ground and polished.

  Further, as shown in FIG. 5B, each lens molding surface 17 has 4 columns × 5 rows of cells formed in the inverted shape of the cellular lens 5 of the lens array 1. The upper mold 15 is provided with two sets of four lens molding surfaces 17. As a result, the upper mold 15 molds the molded body 20a in which the lens arrays 1 for eight pieces (four lens arrays × two sets) are integrated in one press while cooperating with the lower mold 16. More specifically, such a molded body 20a is arranged so that each of the four lens arrays 1 (four cellular lenses 5) satisfies a rotationally symmetrical relationship with respect to a predetermined reference position 17a. Two sets (four lens arrays × two sets) are integrally molded in a state of being arranged in a letter shape.

  As shown in FIG. 5A, the plunger 18 described above is preferably composed of one mold (single mold block) in which a plurality of inverted shapes of the lens array 1 are integrally formed. . In other words, for example, the mold block for molding the lens molding surface 17 of the plunger 18 can have a nested structure in which each lens molding surface and each column or row of cellular lenses are separated. However, if the pressing force is not uniformly applied from the individual mold blocks having a nested structure to the lens array side formed at the time of press molding, the meat is formed on the single molded body 20a integrally molded. A plurality of cellular lenses having different thicknesses may be formed.

  In this case, even if grinding and polishing are performed on the integrally formed molded body 20a, the difference in thickness at the time of molding the cellular lens 5 cannot be eliminated. Therefore, after that, the molded body 20a is separated from the molded body 20a. The individual cellular lenses 5 for each lens array are different in thickness, resulting in a problem that optically identical refractive characteristics cannot be obtained. On the other hand, when the plunger 18 composed of a single mold block in which a plurality of inverted shapes of the lens array 1 are integrally formed is used, such a problem does not occur. After the body 20a is ground and polished, and after the molded body 20a is divided, a lens array on which cellular lenses having the same optical characteristics are mounted can be obtained.

  It should be noted that the plunger 18 having a nested structure is useful when the following object is to be achieved, although the above-described problems occur. In other words, for example, when it is desired to change only the lens pattern of the entire cellular lens without changing the outer shape of the lens array, or during press molding, air is accumulated at the step between each cell in one cellular lens. This is a case where the gap between the nests is used as an air vent for the purpose of preventing the shape from being transferred to the glass accurately. Furthermore, the purpose is to make it possible to repair the mold easily and inexpensively by replacing and inserting only the insert of the part where the wear of the mold is severe, such as the edge part of each cell of one cellular lens. This is the case.

Further, in the lens array 1 of the present embodiment, although depending on the size and shape of the lens array body, the molding area increases as the number of molding dies (the number of molding of the lens array 1) by one press molding increases. . In this case, since the glass loses heat to the mold and the fluidity is lowered, the shortage of the meat is liable to occur, and the sufficient extensibility cannot be obtained and the molding accuracy is lowered. Here, when a borosilicate glass having an average linear expansion coefficient of 32 × 10 ⁻⁷ / ° C. is used as a glass material and the length of the lens array 1 is, for example, up to about 30 mm, molding is performed with good transfer accuracy. be able to. When a glass material having a larger average linear expansion coefficient and better moldability is applied than this, a lens array having a larger size can be formed.

  When the cellular lens 5 is formed only on one light transmission surface of the lens array 1, the other light transmission surface may be a flat surface. As shown in FIGS. 5A and 6, the lower mold 16 has a convex portion 21 having a trapezoidal cross section at a position facing the center portion of each lens molding surface 17 of the upper mold 15. The convex portion 21 enables a sufficient vertical pressing force to be applied to the glass material when a glass material is mounted on the lower mold 16 during press molding, and the reaction force in the normal direction of the convex portion 21 The glass material in the softened state is spread to every corner of the upper mold 15 to prevent the lack of meat and improve the transfer accuracy.

  During the process of cooling the softened glass, the cooling rate of the thick part is relatively slow, so that the influence of heat shrinkage appears more than the part that has been cooled and solidified first, and so-called sinks occur. Since the convex portion 21 forms a concave portion in the molded body 20a, the overall cooling rate is made uniform and the occurrence of sink marks is prevented. In addition, the part to be processed and molded into the lower mold 16 of the molded body 20a (excessive thickness portion 24 in FIGS. 7A, 7B and 8B described later) is polished in a subsequent process and processed into a flat surface. The amount of grinding is reduced by the amount of the recesses, thereby reducing the number of steps in the polishing process.

  Further, when the cellular lenses 5 are formed on both surfaces of the lens array 1, a mold having a lens molding surface having an inverted shape of the cellular lens 5 is used for the lower mold 16, and each surface of the lens array is formed. In order to make the optical axes coincide with each other, a key and a key groove that are engaged with each other between the upper die and the lower die are provided to improve the positional accuracy of the upper die and the lower die.

  The shape of the convex portion 21 of the lower mold 16 shown in FIG. 6 is such that the thickness between the front and back surfaces of the molded body is substantially constant in accordance with the shape of the cellular lens 5 to be molded. It is preferable to set. For example, as shown in FIG. 7A, in the case of a cellular lens 5a having a convex shape toward the center, the convex portion 21a of the lower mold 16 is also a convex shape substantially parallel to the lens surface of the cellular lens 5a. Is desirable. On the other hand, as shown in FIG. 7B, in the case of the cellular lens 5b having a thick peripheral edge and concave toward the center, the convex part 21b of the lower mold 16 is also a concave with a high peripheral part and a low central part. A shape is preferable. In these cases, it is not necessary to provide the same cell shape as that of the cellular lenses 5a and 5b on the surfaces of the convex portions 21a and 21b of the lower mold 16, and the thickness between the front and back surfaces of the molded body as a whole is substantially constant (front and back surfaces). As long as the shape is substantially parallel). Thereby, the thickness of the molded body 20a can be made substantially constant without impairing the spreadability of the glass to be molded, and the influence of a partial heat shrinkage difference can be minimized.

[Press forming process]
The glass material is heated by, for example, an electric furnace set at a furnace temperature of 1200 ° C. until the surface temperature of the glass material reaches approximately 1000 ° C.

  The heated glass material is placed on the lower mold 16, the upper mold 15 is lowered and a pressing force is applied, and the mold shape is transferred and press-molded. At this time, in order to perform transfer with high accuracy, this state is maintained for a predetermined time while the pressing force is applied to the upper die 15. The holding time is, for example, about 10 to several tens of seconds although it depends on the material of the glass and the product size. The upper mold 15 is raised after the glass is cooled.

  Further, in order to avoid the process conditions from fluctuating due to the temperature rise of the mold due to continuous molding, the temperature of the mold 14 is monitored, and when the temperature exceeds a predetermined temperature, the surface of the mold 14 is monitored. The temperature of the mold 14 is controlled by blowing air (blow air) on the inside or circulating a cooling medium inside the mold 14.

  Furthermore, in this press molding, since an excessive glass material is pressed compared to the product weight, the upper die 15 and the lower die 16 are not in direct contact with each other. For this reason, the position (outer size) of the outer edge of the lower mold 16 is not particularly defined. Further, the ring 19 of the upper mold 15 has a shape that retreats outward with the molded portion as a projection. For this reason, during pressing, the glass does not rapidly cool and solidify due to contact with the mold, but is spread in the mold 14, and excess glass protrudes out of the mold to reduce the flow resistance, resulting in high transfer. Accuracy can be obtained.

  Here, a reheat press is applied in this press molding process. In this reheat press, the glass material once cooled and solidified is heated and softened from the outside, so the internal temperature is relatively lower than the temperature near the surface of the glass material, and the temperature difference between the surface after molding and the inside Is small and the influence of sink marks is small. Furthermore, after the molded body 20a shown in FIG. 6 molded in this manner is gradually cooled by a slow cooling furnace, the protruding portion 22 is cut off.

[Polishing process]
Next, the polishing process will be described based on FIGS. 8A to 8C. Here, FIG. 8A is a plan view illustrating a molded body 20b in which four lens arrays 1 after cutting out the protruding portion 22 are integrated, and FIG. 8B is a cross-sectional view thereof. 8C is a cross-sectional view showing a molded body 20c obtained by polishing the molded body 20b shown in FIG. 8B.

  First, as shown in FIG. 8B, the other light transmitting surface 3 of the molded body 20b on the side where the cellular lens 5 is not formed is ground and polished. That is, the surplus thickness portion 24 on the other light transmission surface 3 side including the recess 23 formed by the projection 21 of the lower mold 16 is ground and polished, and then the thickness is substantially adjusted to the product shape by lapping, Optical polishing is performed by polishing.

  As a result, the excessively thick portion 24 is removed from the molded body 20b, and as shown in FIG. 8C, a molded body 20c in which four lens arrays 1 each having an end surface formed of the die processing surface 7 are integrated is obtained. .

[Film formation process]
Next, the film forming process will be described with reference to FIGS. 9A, 9B, 10A, and 10B. Here, FIG. 9A is a plan view showing a state in which the molded body 20c obtained through the polishing step is held by the holder 25, and FIG. 9B is a sectional view taken along the line CC in FIG. FIG. 10A is a plan view of the molded body 20d obtained through the film forming process as seen from the antireflection film 12 side, and FIG. 10B is a DD cross-sectional view thereof.

First, of the other light transmitting surface 3 on the side of the molded body 20c where the cellular lens 5 is not formed, the optical functional region, that is, the region where the cellular lens 5 is formed is covered from the other light transmitting surface 3 side. An antireflection film 12 is formed on the region by a method such as vacuum deposition or sputtering. Here, as the antireflection film, for example, SiO ₂ , TiO _2, or SiO ₂ / TiO ₂ multilayer film is suitable. Moreover, you may form the film | membrane for interrupting | blocking the ultraviolet-ray from a light source as needed.

  As shown in FIGS. 9A and 9B, the holder 25 serving as the frame body described above includes a support portion 29 that supports the outer peripheral portion of the molded body 20c, and a dividing line 30 for dividing the molded body 20c for each lens array. And four openings 27 defined by a cross-shaped mask portion 28 that prevents the antireflection film 12 from being formed to a predetermined width. The holder 25 is formed with an optical functional region corresponding to the cellular lens 5 of the molded body 20c, and has a predetermined distance, for example, a width of about 1 to 2 mm, from the outer edge (divided section 8) of the light transmission surface 3. The widths of the support part 29 and the mask part 28 are set so as to leave a non-deposition part (described later) (see the non-deposition part 26 in FIG. 10B). The width of the support part 29 can be set to, for example, a width of about 1 mm to 2 mm, and the width of the mask part 28 can be set to, for example, a width of about 2 mm to 4 mm. Note that the width of the mask portion 28 can be appropriately changed as long as a necessary film forming range can be secured and the film forming portion is not affected by the division of the molded body 20c.

  As shown in FIGS. 10A and 10B, the molded body 20d thus obtained has a range that completely covers the formation region of the cellular lens 5 on the one light transmission surface 2 side from the other light transmission surface 3 side. That is, the antireflection film 12 is covered in a range slightly wider than the cellular lens 5. Specifically, the molded body 20d has a width of 1 mm to 2 mm at the outer edge thereof, and is 2 mm at an adjacent boundary portion of each lens array 1 (including a parting line 30 for dividing the molded body 20d). The non-film-formation part 26 of -4 mm width is included.

  In the present embodiment, the example in which the antireflection film 12 is formed only on one light transmission surface 3 side (polishing surface side) of the molded body 20c has been described. However, the film formation is performed on the surface of the cellular lens 5. In this case, if the front and back of the molded body 20c are set in the opposite direction with respect to the holder 25, a mask is applied in the same manner as described above, and a film can be formed only in a necessary optical functional area. Further, even when an ultraviolet cut film, an infrared cut film, or the like is formed as an optical film, the non-film forming portion 26 can be formed in the outer edge portion of the molded body 20d and the adjacent boundary portion of each lens array 1 as described above.

[Parting process]
Finally, the dividing process will be described with reference to FIG. Here, FIG. 11 is a plan view showing a state in which the molded body 20d is divided into four lens arrays.

  As shown in FIG. 11, the molded body 20 d on which the antireflection film 12 is formed is divided into four lens arrays 1 (along the planned dividing line 30). The dividing method is not particularly limited, and by using a precision cutting device such as a slicer or a dicing saw, an accurate outer diameter dimension and the surface of the molded body 20d (light transmitting surfaces 2 and 3 of the lens array 1) are obtained. A cut surface perpendicular to the direction along the line is obtained. As a simple method, it is also possible to separate the surface of the molded body 20d with a cutter by making a linear scratch (cutting the planned dividing line 30), bending it and breaking it. After the separation, the lens array 1 is obtained by chamfering the edge of the cut surface as necessary. At this time, chamfering is performed so that the width of the chamfered portion does not reach the antireflection film 12, thereby preventing damage to the antireflection film (optical film) 12. In other words, it is preferable to set the width of the non-film forming part 26 in advance (the width of the holder support part 29 and the mask part 28 in the film forming process) in consideration of the width necessary for chamfering.

  In the lens array 1 obtained in this way, the lens array 1 can be positioned with respect to an optical apparatus such as a projector by using the die processing surface 7 that is not the cut or broken sectional surface 8, so that the accuracy of the divided surface 8 is somewhat rough. There is no hindrance, and slicing by scribe can be applied. Further, the mold processing surface 7 can be used as a reference surface for positioning at the time of division.

  Further, in such a lens array 1, since the optical center can be indexed or positioned by the reference surface 9 of the mold processing surface 7, no centering is required. Further, the lens array 1 has a flange portion 6 and has a configuration in which the surface of the cellular lens 5 is recessed from the surface of the flange portion 6. Therefore, according to the lens array 1, even when the surface of the cellular lens 5 is placed downward at the time of cutting or the like, the cellular lens 5 does not directly touch the placement surface, and the cellular lens 5 Contamination and scratches are prevented.

  Further, after cutting by scribing or the like, when the divided surface is ground and polished in order to prepare the divided surface, a plurality of lens arrays 1 are aligned with the die processing surface 7 as a reference, and a plurality of these are stacked. By grinding and polishing the lens array 1, uniform processing can be performed. At this time, since the flange portion 6 protrudes from the surface of the cellular lens 5, the flange portions 6 come into contact with each other between the lens arrays 1 stacked on each other, and the cellular lens 5 is prevented from being damaged.

(Second Embodiment)
Next, a liquid crystal projector in which the lens array 1 embodying the present invention is applied to an optical system will be described with reference to FIG.

  As shown in FIG. 12, a liquid crystal projector 70 that is one of the projection type display devices includes a polarization illumination device 90, a light guide unit 99, dichroic mirrors 71 and 74, a reflection mirror 72, and three liquid crystals. Mainly composed of light valves 73, 75, 81, a cross dichroic prism 83, and a projection lens 84.

  The dichroic mirrors 71 and 74 are color light separation units for separating the white light W into three color lights of red light R, green light G, and blue light B. The three liquid crystal light valves 73, 75, and 81 function as a light modulator that modulates the three colors of light according to the given image signal to form an image. The cross dichroic prism 83 functions as a color light combining unit that combines three color lights to form a color image. The projection lens 84 is a projection optical system that projects light representing the synthesized color image onto the screen 85.

  The dichroic mirror 71 transmits the red light R component of the light beam of the white light W emitted from the polarization illumination device 90 and reflects the blue light B component and the green light G component. The transmitted red light R is reflected by the reflection mirror 72 and enters the liquid crystal light valve 73 for red light. On the other hand, among the blue light B and green light G reflected by the dichroic mirror 71, the green light G is reflected by the dichroic mirror 74 and enters the liquid crystal light valve 75 for green light. On the other hand, the blue light B passes through the dichroic mirror 74 and enters the light guide 99.

  Here, in the liquid crystal projector 70 having this configuration, as shown in FIG. 12, the optical path length of the blue light B is the longest of the three color lights. Therefore, the light guide unit 99 described above configured of a relay lens system is provided at the subsequent stage of the dichroic mirror 74. That is, the blue light B passes through the dichroic mirror 74 and is first guided to the relay lens 78 through the incident lens 76 and the reflection mirror 77. Further, the blue light B that has passed through the relay lens 78 is reflected by the reflection mirror 79 and guided to the output lens 80, and enters the liquid crystal light valve 81 for blue light.

  The three liquid crystal light valves 73, 75, 81 modulate each color light according to an image signal which is image information given from an external control circuit (not shown), and generate color light including image information of each color component. To do. The modulated three color lights enter the cross dichroic prism 83. In the cross dichroic prism 83, a dielectric multilayer film that reflects red light R and a dielectric multilayer film that reflects blue light B are formed in a cross shape. These dielectric multilayer films combine the three color lights to form light representing a color image. The synthesized light is projected onto the screen 85 by the projection lens 84 which is a projection optical system, and the image is enlarged and displayed.

  Further, the polarization illumination device 90 of the liquid crystal projector 70 includes a light source unit 91 and a polarization generator 92. The light source unit 91 emits a light beam in a random variable polarization direction including an s-polarized component and a p-polarized component. The light beam emitted from the light source unit 91 is converted into one type of linearly polarized light, for example, s-polarized light, whose polarization directions are substantially uniform by the polarization generator 92.

  The light source unit 91 includes a light source lamp and a parabolic reflector. The light emitted from the light source lamp is unilaterally reflected by the parabolic reflector and enters the polarization generator 92 as a substantially parallel light beam. In a small liquid crystal projector such as a mobile one, an ellipsoidal reflecting mirror is often used for the purpose of reducing the size of the optical system by narrowing the light beam from the reflecting mirror.

  The polarization generator 92 includes a first optical element 93 and a second optical element 98. The first optical element 93 and the second optical element 98 are arranged so that the centers thereof coincide with the optical axis. Further, the second optical element 98 includes an optical element 94 and an exit side lens 97. The optical element 94 and the exit side lens 97 are arranged so that the centers thereof coincide with the optical axis.

  The optical element 94 includes a condenser lens array 95 and two polarization conversion element arrays 96. The condensing lens array 95 is a lens array having the same structure as that of the first optical element 93, and is arranged in an opposing direction. Further, the condensing lens array 95 has a role of condensing a plurality of divided light beams divided by the respective light beam dividing lenses together with the first optical element 93. The polarization conversion element array 96 has a function of converting an incident light beam into one type of linearly polarized light, for example, s-polarized light and emitting it.

  Here, the lens array 1 described above is applied as the condenser lens array 95 and the first optical element 93. The lens array 1 has a configuration in which minute light beam splitting lenses (cell-like lenses 5) having a rectangular plate-like outline are arranged in a matrix of M rows in the vertical direction and N columns in the horizontal direction. In the lens array 1, by having the reference surface 9 constituted by the mold processing surface 7, the center of the lens array 1 and the optical axis center, and the optical axis and the direction of the lens array 1 can be accurately aligned. . As a result, an accurate optical path can be obtained, the light use efficiency of the liquid crystal projector 70 can be increased, the projected image can be kept bright, and inconveniences such as uneven illuminance can be avoided. Further, in the lens array 1 incorporated in the liquid crystal projector 70 according to the present embodiment, the antireflection film 12 is formed at a predetermined interval from the mold processing surface 7 and the dividing surface 8. It is possible to avoid the antireflection film 12 from coming into direct contact with the locking tool or the like during the incorporation of the film, thereby preventing film peeling or film cracking from the locking portion.

  The present invention has been specifically described above with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the invention.

(Other embodiments)
In the first embodiment described above, a manufacturing method in which polishing or film forming processing is performed on a molded body in which four lens arrays are integrally formed is illustrated. For example, as shown in FIG. The molded body 50 integrally formed with the lens array 1 may be polished and film-formed, and then the lens array may be divided one by one. In this case, the direction of the arrow shown on each cellular lens 5 in FIG. 13A is formed with a mold in which the lens array 1 is divided and then the upper direction, and the left side of each divided lens array 1 ( The end face on the left side when the direction of the arrow is on the lens array 1 is the mold processing surface 7. That is, by assembling the optical device with the die processing surface 7 as a reference, highly accurate assembly is realized. FIG. 13B shows a molded body 55 in which six lens arrays 1 are integrally molded. In the figure, the direction of the arrow shown on each cellular lens 5 is after the lens array 1 is divided. By performing molding with the mold that is in the upward direction, the lower end surface of each lens array 1 after the division (the lower side when the direction of the arrow is on the lens array 1) is the die processing surface 7 It is an example. In this example as well, highly accurate assembly is realized. Furthermore, although not shown in the figure, the molded body in which two lens arrays are integrally molded may be polished and film-formed, and then the lens array may be divided one by one. In this case, the two lens arrays have the same positional relationship as the lens array for one set located above and below in FIG. 13A or FIG. It becomes the processing surface.

  The number of lens arrays that are integrally molded varies depending on the size of each lens array, but can be set as appropriate in consideration of the spreadability (shape transfer accuracy) of the glass during press molding. Furthermore, in the said embodiment, although the thing of the shape where the surface of the cellular lens 5 was dented rather than the surface of the flange part 6 of each lens array 1 was described, this invention is a cellular lens rather than a flange part. The present invention can also be applied to a lens array having a convex surface.

  Further, in the first embodiment described above, the case where the cellular lens is mainly formed only on one light transmitting surface of the lens array has been described in detail, but it is exemplified in the [mold] column of the lens array manufacturing method. As described above, when the cellular lenses 5 are formed on both surfaces of the lens array 1, press molding is performed using a mold in which the lens molding surface having the inverted shape of the cellular lens 5 is also formed on the lower mold 16. . In this case, the polishing step in the first embodiment is not necessary.

  However, as in the first embodiment, when excessive glass material is pressed compared to the product weight and excess glass protruding from the mold is cut, the cut surface is assembled to a lighting device such as a projector. It is preferable to prepare by grinding or polishing so as not to obstruct. When an excess glass material is used (a proper amount of glass material is used) and press molding is performed with a mold in which the periphery of the upper mold and the lower mold are in close contact with each other during molding, the glass does not protrude. Therefore, in principle, it is not necessary to grind or polish the end face of the molded body. Next, in the film forming process, the film is formed only on the necessary optical functional area in the same manner as when the film is formed on the surface of the cellular lens 5 in the first embodiment, and then along the dividing line. Dividing into four lens arrays (the other points are the same as in the first embodiment). In this way, even when the cellular lenses 5 are formed on both surfaces of the lens array 1, a lens array in which an optical film is formed at a predetermined interval from the dividing surface is obtained in substantially the same manner as in the first embodiment. Can do.

  Here, when the manufacturing method in the case of forming the cellular lenses on both surfaces of the lens array is arranged, the rectangular plate having the two main surfaces as light transmitting surfaces and having the cellular lenses on both the light transmitting surfaces. A method of manufacturing a glass optical element having a shape, wherein a glass material in a softened state is pressed by an upper mold and a lower mold each having a plurality of inverted shapes of the glass optical element to be manufactured. A press molding step for obtaining a molded body in which the glass optical element is integrally molded, and a predetermined width including a predetermined cutting line for dividing the molded body defined on the light transmitting surface, and masked light transmission A film forming process for depositing an optical film on a surface, and a dividing process for dividing the molded body on which the optical film is applied in the film forming process for each glass optical element along the planned dividing line. Characterized by having A method of manufacturing a glass optical element that.

  According to the present invention, a glass optical element having excellent assembly accuracy to an optical instrument can be manufactured with high productivity without relying on precise post-processing, and the optical film has excellent durability. Is big.

The perspective view which shows the lens array for liquid crystal projectors as a glass optical element which concerns on the 1st Embodiment of this invention. The top view of the lens array shown in FIG. FIG. 3 is a cross-sectional view of the lens array shown in FIG. FIG. 4 is a detailed view of part B of the lens array shown in FIG. 3. Sectional drawing of the metal mold | die used for shaping | molding of the lens array shown in FIG. The bottom view of the upper mold | type which comprises the metal mold | die of FIG. 5A. Sectional drawing which shows typically the state at the time of press molding of the metal mold | die of FIG. 5A. Sectional drawing which shows the structure of a metal mold | die suitable when shape | molding the lens array from which the center part of a cellular lens becomes convex shape. Sectional drawing which shows the structure of a metal mold | die suitable when shape | molding the lens array from which the center part of a cellular lens becomes concave shape. The top view which illustrated the molded object with which the lens array for four pieces after the protrusion partial cutting was united. Sectional drawing of the molded object shown to FIG. 8A. Sectional drawing which shows the state which grind | polished the molded object shown to FIG. 8B. The top view which shows the state which hold | maintained the molded object obtained through the grinding | polishing process with the holder. CC sectional drawing of FIG. 9A. The top view which looked at the molded object obtained through the film-forming process from the antireflection film side. FIG. 10D is a sectional view taken along line DD in FIG. 10A. The top view which shows the state by which the molded object was divided | segmented into four lens arrays. The figure which shows the structure of the liquid crystal projector which concerns on 2nd Embodiment which applied the lens array of FIG. 1 to the optical system. The figure for demonstrating the manufacturing method of the lens array which concerns on other embodiment of this invention. The figure for demonstrating other manufacturing methods of the lens array different from the manufacturing method illustrated to FIG. 13A.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lens array, 2, 3 ... Light transmissive surface, 5, 5a, 5b ... Cellular lens, 6 ... Flange part, 7 ... Mold processing surface, 8 ... Divided section, 9 ... Reference surface, 11 ... Chamfered part, DESCRIPTION OF SYMBOLS 12 ... Antireflection film (optical film), 14 ... Mold, 20a, 20b, 20c, 20d, 50, 55 ... Molded body, 24 ... Excessive thickness part, 25 ... Holder, 26 ... Non-deposition part, 27 ... Opening portion, 28 ... mask portion, 29 ... support portion, 30 ... partition planned line, 70 ... liquid crystal projector, 93 ... first optical element, 95 ... condensing lens array.

Claims (12)

Two principal surfaces are each configured as a light transmission surface, and is a rectangular plate-like glass optical element in which a cellular lens is formed on at least one of the light transmission surfaces,
A die machining surface formed by die machining that constitutes some of the four end faces;
A divided cross-section formed by cutting or breaking constituting the remaining end surface excluding the mold-worked surface;
An optical film partially formed on at least one light transmission surface at a predetermined interval from the dividing surface;
A glass optical element comprising:   The mold processing surface constitutes two predetermined end surfaces adjacent to each other among the four end surfaces, and the dividing surface constitutes the remaining two end surfaces adjacent to each other. The glass optical element as described.   The glass optical element according to claim 1, wherein a part of the die processing surface is formed as a reference surface for positioning.   The light transmission surface on which the cellular lens is formed has a flange portion surrounding the periphery of the cellular lens, and is formed at a position where the cellular lens is recessed from the surface of the flange portion. The glass optical element according to any one of claims 1 to 3.   The glass optical element according to any one of claims 1 to 4, wherein the divided section is chamfered.   The cellular lens is formed only on one light transmitting surface of the two light transmitting surfaces, and the other light transmitting surface on which the cellular lens is not formed is optically polished, The glass optical element according to claim 1, wherein the optical film is formed thereon.   The glass optical according to any one of claims 1 to 6, wherein the optical film is made of any one of an antireflection film, an ultraviolet cut film, an infrared cut film, or a combination thereof. element.   The glass optical element according to claim 1, wherein the optical film is formed by vacuum deposition or sputtering.   The glass optical element according to claim 1, wherein the glass optical element is used in an optical system of a projector. A manufacturing method for manufacturing a rectangular plate-like glass optical element having two principal surfaces each configured as a light transmission surface and having a cellular lens on one of the light transmission surfaces,
A press molding step of pressing a softened glass material with a mold having a plurality of inverted shapes of the glass optical elements to be manufactured, and obtaining a molded body in which a plurality of the glass optical elements are integrally molded;
An optical polishing step of optically polishing the other light transmitting surface side of the molded article obtained by the press molding step, on which the cellular lens is not formed,
Masking a predetermined width including a predetermined dividing line for dividing the molded body, which is defined on the other light transmission surface optically polished in the optical polishing step, and an optical film on the masked other light transmission surface A film forming process for depositing;
A dividing step of dividing the molded body on which the optical film is applied in the film forming step for each glass optical element along the planned dividing line;
A method for producing a glass optical element, comprising:   The molded body is molded in a state where four glass optical elements are arranged in a square shape so as to satisfy a rotationally symmetrical relationship with respect to a predetermined reference position. Item 11. A method for producing a glass optical element according to Item 10. In the press molding step, a flange portion that surrounds the periphery of each cellular lens for each glass optical element is molded, and each cellular lens is molded at a position recessed from the surface of the flange portion,
In the dividing step, from the other light transmission surface side on which the optical film is deposited except for a predetermined width including the dividing line, by bringing a cutting blade into contact along the cutting line, The method for producing a glass optical element according to claim 10 or 11, wherein the molded body is divided for each glass optical element.

Images