JP2008033279A - Area division type wavelength plate and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an area division type wavelength plate having fine periodical structures in divided areas, wherein a position of a boundary between divided areas or a direction of the fine periodical structure can be recognized with the naked eyes, and to provide a method for manufacturing the plate. <P>SOLUTION: The area division type wave plate includes at least two of divided areas 11 each having a fine periodical structure extended in a predetermined direction and a visible portion where a boundary 13 of the divided areas and/or the direction of the fine periodical structure is visible, wherein the visible portion is formed along a direction of the boundary and/or the fine periodical structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a region-dividing wave plate having a fine periodic structure extending in a predetermined direction in at least two regions and a method for manufacturing the same.

Non-Patent Document 1 below discloses a region-dividing wavelength plate using a three-dimensional periodic structure (photonic crystal) (FIG. 7). This region-dividing wave plate 50 includes regions 51 and 52 having a periodic structure as shown in FIG. 7 and divided by a dividing line 53, and can be used by being disposed in an optical system for an optical pickup, for example.
“At the front line of practical application of photonic crystals” Shojiro Kawakami (O plus E Vol.28, No4, April 2006)

  When the wavelength-divided wave plate as in Non-Patent Document 1 is formed in two regions as shown in FIG. 7 with a fine periodic structure having different directions sandwiching the boundary portion, it is incorporated into the optical system in the optical device. It is necessary to adjust the position of the boundary and the direction of the fine periodic structure. However, the position of the boundary and the direction of the fine periodic structure are usually difficult to see with the naked eye, and such adjustment is troublesome and time-consuming.

  In view of the problems of the prior art as described above, the present invention visually recognizes the position of the boundary between divided regions and the direction of the fine periodic structure in the divided region wave plate having a fine periodic structure in the divided regions. An object of the present invention is to provide a region-dividing wave plate that can be known and a method for manufacturing the same.

  In order to achieve the above object, an area-divided wave plate according to the present invention is an area-divided wave plate having a fine periodic structure extending in a predetermined direction in each area divided into at least two areas. And a visual recognition part capable of visually recognizing the direction of the fine periodic structure, and the visual recognition part is formed along the boundary part and / or the direction. .

  According to this region-divided wave plate, the visual recognition part is formed along the boundary between the divided regions and / or along the direction of the fine periodic structure, and thus the boundary between the divided regions and / or Alternatively, the direction of the fine periodic structure can be known with the naked eye.

  In the region-divided wave plate, the boundary portion is formed so as to protrude from the surrounding fine periodic structure, whereby a visual recognition portion along the boundary portion can be configured.

  Moreover, the visual recognition part along the direction of a fine periodic structure can be comprised because at least one side in the boundary of the said fine periodic structure with respect to the area | region where a fine periodic structure does not exist substantially corresponds with the direction of the said fine periodic structure.

  The region-divided wave plate can be configured such that the direction of the fine periodic structure in each of the divided regions is different.

  In addition, the divided first region functions as a -1/4 wavelength plate, and the divided second region functions as a +1/4 wavelength plate, thereby realizing a wave plate having both functions. . In addition, it is preferable to provide a 1st area | region and a 2nd area | region on both surfaces of a region division type | mold wavelength plate.

  Further, it is preferable to have a broadband characteristic within a wavelength range of 400 to 800 nm. By using a wavelength band of the above-mentioned region division type wave plate as a relatively wide band of 400 nm to 800 nm, it is required as an optical pickup device, for example. It is possible to provide uniform phase difference characteristics within a wide wavelength band such as 405 nm, 650 nm, and 780 nm (compatible with three wavelengths of blue-violet LD, DVD, and CD).

  A method of manufacturing a region-dividing wave plate according to the present invention is characterized in that the above-described region-dividing wave plate is manufactured by an imprint method.

  According to this manufacturing method, the molded product is likely to be deformed by imprint molding at the boundary between the divided regions, and the boundary protrudes more than the surrounding fine periodic structure due to the deformation, so that the boundary itself is visually recognized. Part. Such deformation at the boundary portion is more likely to occur in the case of a configuration that intersects at the boundary portion because the direction of the fine periodic structure of each divided region is different. In addition, at least one side of the boundary of the fine periodic structure with respect to the region where the periodic structure does not exist substantially coincides with the direction of the fine periodic structure, so that the mold release at the time of imprint molding is stably performed. Since the load on the base material and the mold can be reduced, the molding yield can be improved and the durability of the mold can be improved.

  As described above, since the visual recognition part that can visually recognize the boundary part between the divided regions and / or the direction of the fine periodic structure can be formed together with the fine periodic structure by imprint molding, the visual recognition part is provided. No special costs are incurred and production is possible economically.

  According to the region-divided wave plate of the present invention, the position of the boundary between regions divided in the region-divided wave plate having a fine periodic structure in the divided region and the direction of the fine periodic structure can be known with the naked eye. it can. For this reason, when an area division type wavelength plate is arranged in an apparatus or the like to construct an optical system, it becomes easy to incorporate and adjust the area division type wavelength plate, leading to a reduction in assembly man-hours.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  <First Embodiment>

  FIG. 1 is a schematic plan view (a), a schematic cross-sectional view (b), and an enlarged schematic partial cross-sectional view (c) of a region-dividing wave plate according to the first embodiment. FIG. 2 is an enlarged plan view (a) of a main part and a main part perspective view (b) of the vicinity of the boundary part showing the vicinity of the boundary part of the region-dividing wave plate of FIG.

  As shown in the plan view of FIG. 1A, the disc-shaped region-dividing wave plate 10 is different from the first region 11 and the first region 11 having the fine periodic structure portion 15 extending linearly. And a second region 12 having a fine periodic structure portion 16 extending in the direction, with a linear boundary portion 13 sandwiched between the first region 11 and the second region. 12 is formed so as to intersect at a boundary portion 13 with 12.

  In the region-divided wave plate 10, the first region 11 and the second region 12 are formed on both surfaces of the base material 14. That is, as shown in FIG. 1B, the second region 12 is located on the back side of the first region 11 and the first region 11 is located on the back side of the second region 12. A fine periodic structure is formed.

  As shown in FIGS. 1B and 1C, the first region 11 on one surface of the region-divided wave plate 10 has a concave and convex first fine periodic structure portion 15, and a convex portion 15a and a concave portion. 15b is formed periodically and repeatedly. The second region 12 on one surface has a concave-convex second fine periodic structure portion 16, and the convex portion 16a and the concave portion 16b are periodically and repeatedly formed (FIG. 2A).

  Similarly, the second region 12 on the other surface has a concave-convex second fine periodic structure portion 17, and convex portions 17a and concave portions 17b are formed periodically and repeatedly. The first region 11 on the other surface has the first fine periodic structure portion 18 having an uneven shape. In addition, although the period pitch of the unevenness | corrugation of the fine periodic structure parts 15-18 can be about 300 nm, and the width | variety of each convex part can be about 200 nm, for example, this is an example and another dimension may be sufficient as it. Of course.

  As shown in FIG. 2A, at the linear boundary portion 13 between the first region 11 and the second region 12, both fine periodic structure portions 15 and 16 have the convex portion 15a and the convex portion 16a intersect. Similarly, the recess 15b and the recess 16b are continuous so as to intersect each other. As shown in FIG. 2B, a protruding portion 13a is formed on the boundary portion 13 so as to protrude from the protruding portions 15a and 16a of the surrounding fine periodic structure portions 15 and 16 on the protruding portions 15a and 16a. Has been.

  In the protruding portion 13a, the convex portions 15a and 16a at which the two fine periodic structure portions 15 and 16 intersect at the boundary portion 13 are deformed into a convex shape at the time of release when the region-dividing wave plate 10 is manufactured by the imprint method. Is formed. For this reason, the protrusion part 13a can be comprised along the boundary part 13, and can comprise the visual recognition part which can visually recognize the boundary part 13. FIG.

  As described above, according to the region-divided wave plate 10 of the first embodiment, the boundary portion 13 between the divided regions 11, 12 is formed along the boundary portion 13. It can be recognized with the naked eye by the protruding portion 13a protruding from the protruding portions 15a, 16a where the portions 15, 16 intersect. For this reason, when an area division type wavelength plate is arranged in an apparatus or the like to configure an optical system, it becomes easy to incorporate the area division type wavelength plate or adjust the boundary between the divided areas, thereby reducing the number of assembly steps. .

  <Second Embodiment>

  FIG. 3 is a schematic plan view (a) of a region division type wave plate according to the second embodiment, a similar plan view (b) showing another configuration example, and a similar configuration example showing another configuration example thereof. It is a top view (c).

  As shown in FIG. 3A, the region-divided wave plate 60 according to the second embodiment is configured as a rectangular shape as a whole, and includes a first region 61 having a fine periodic structure portion 65 extending linearly. And a second region 62 having a fine periodic structure portion 66 extending in a different direction from the first region 61, with a linear boundary portion 63 sandwiched therebetween, and both fine periodic structure portions 65, 66 are provided in the first region 61. The region 61 and the second region 62 are formed so as to intersect with each other at the boundary 63.

  Similar to the fine periodic structure portions 65 and 66 on the front surface side, the region-divided wave plate 60 is also configured on the back surface side, and the fine periodic structure portions are formed on both surfaces of the substrate as in FIG. Each fine periodic structure portion is formed in a concavo-convex shape as in FIGS. 1B and 1C, and a convex portion and a concave portion are formed periodically and repeatedly.

  The rectangular region-dividing wave plate 60 is divided into a first region 61 and a second region 62 with a boundary 63 interposed therebetween, but within each side constituting the outer periphery of the first region 61. The inclined side 61a inclined with respect to the boundary part 63 substantially coincides with the direction of the fine periodic structure part 65, and is inclined with respect to the boundary part 63 within each side constituting the outer periphery of the second region 62. The inclined side 62 a is configured to substantially coincide with the direction of the fine periodic structure portion 66. As described above, the inclined sides 61a and 62a of the regions 61 and 62 form a part of the outer periphery of the regions 61 and 62 to form a boundary with the region without the fine periodic structure portion, and the fine periodic structure portion. It is possible to form a visual recognition portion that substantially coincides with the directions of 65 and 66 and extends along each direction of the fine periodic structures 65 and 66.

  As described above, according to the region-divided wave plate 60 of the second embodiment, the fine periodic structure portion 65 formed in the divided regions 61 and 62 in the respective directions of the fine periodic structure portions 65 and 66. , 66 along the respective directions and the inclined sides 61a, 62a constituting the boundary can be recognized with the naked eye.

  Next, another configuration example of the region division type wave plate according to the second embodiment will be described with reference to FIGS.

  The rectangular area-divided wave plate 70 in FIG. 3B is configured in substantially the same manner as in FIG. 3A, and is substantially parallel in the same manner as the first area 71 having a substantially parallelogram shape with the boundary 73 interposed therebetween. Although divided into second regions 72 having a shape, inclined sides 71 a and 71 c which are inclined with respect to the boundary portion 73 within each side constituting the outer periphery of the first region 71 are fine periodic structure portions 75. The inclined sides 72a and 72c that are inclined with respect to the boundary portion 73 within the sides constituting the outer periphery of the second region 72 substantially coincide with the direction of the fine periodic structure portion 76. It is configured. As described above, the inclined sides 71a and 72a of the regions 71 and 72 form a part of the outer periphery of the regions 71 and 72 to form a boundary with the region without the fine periodic structure portion, and the fine periodic structure portion. It is possible to form a visual recognition portion that substantially coincides with the directions 75 and 76 and that follows each direction of the fine periodic structures 75 and 76.

  According to the region-divided wave plate 70 of FIG. 3B, the directions of the fine periodic structure portions 75 and 76 are set to the directions of the fine periodic structure portions 75 and 76 formed in the divided regions 71 and 72, respectively. It can be recognized with the naked eye by the inclined sides 61a, 61c, 62a, and 62c that form the boundary along the line.

  Further, the polygonal region-dividing wave plate 80 in FIG. 3C is configured in substantially the same manner as in FIG. 3A, and is divided into a first region 81 and a second region 82 with a boundary 83 interposed therebetween. However, among the sides constituting the outer periphery of the first region 81, the inclined side 81 a inclined with respect to the boundary portion 83 substantially coincides with the direction of the fine periodic structure portion 85, and the second region Of the sides constituting the outer periphery of 82, the inclined side 82 a that is inclined with respect to the boundary portion 83 is configured to substantially coincide with the direction of the fine periodic structure portion 86. Other sides constituting the outer periphery of the regions 81 and 82 are polygonal. As described above, the inclined sides 81a and 82a of the regions 81 and 82 form a part of the outer periphery of the regions 81 and 82 to form a boundary with the region without the fine periodic structure portion, and the fine periodic structure portion. It is possible to configure a visual recognition portion that substantially coincides with the directions of 85 and 86 and extends along each direction of the fine periodic structures 85 and 86.

  As described above, according to the region-divided wave plate 80 in FIG. 3C, the fine periodic structure portions 85 and 86 formed in the divided regions 81 and 82 are arranged in the directions of the fine periodic structure portions 85 and 86, respectively. It can be recognized with the naked eye by the inclined sides 81a and 82a that are along the respective directions 86 and constitute the boundary.

  3A to 3C as described above, the direction of the fine periodic structure portion is set to the direction of the fine periodic structure portion formed in each divided region. Since it can be seen with the naked eye by the inclined side that forms the boundary along the direction, when the area division type wave plate is arranged in an apparatus or the like to constitute the optical system, the division of the area division type wave plate or the fine periodic structure part This makes it easy to adjust the direction and reduces the number of assembly steps. Moreover, the mold release at the time of imprint molding is performed stably, and the load on the substrate and the mold at the time of mold release can be reduced.

  Next, a manufacturing method by the imprint method of the region division type wave plate 10 of FIG. 1 will be described with reference to FIGS. FIG. 4 is a side sectional view schematically showing a main part of an imprint apparatus for performing the imprint method according to the present embodiment. FIG. 5 is a flowchart for explaining steps S01 to S06 of the manufacturing method by the imprint method according to this embodiment.

  In addition, the imprint method is, for example, as disclosed in JP-A-2005-189128, by using a mold having a fine structure and press-molding a resin such as polystyrene, and then peeling the molded product from the mold. This is a known method for obtaining a fine structure having fine protrusions.

  As shown in FIG. 4, the upper die b having the uneven portion b <b> 1 corresponding to the fine periodic structure portion 15 of the first region 11 and the fine periodic structure portion 16 of the second region 12 in FIGS. Similarly, a lower mold c having an uneven portion c1 corresponding to the fine periodic structure portion 17 and the fine periodic structure portion 18 is prepared, and the upper die b and the lower die c are respectively attached to the attachment portions m and n of the imprint apparatus. Then, the base material a made of resin is set (S01).

  Next, after raising the upper mold b to a predetermined temperature (S02), the upper mold b is lowered in the vertical downward direction v (S03), and the base material a is sandwiched between the upper mold b and the lower mold c. In step S04, the upper die b and the lower die c are held for a predetermined time in this pressure state (S05).

  Next, after the upper mold b and the lower mold c are cooled (S06), the upper mold b is lifted in the vertical upper direction v ′, and the substrate a is removed by removing it from the lower mold c. By releasing the mold (S07), the area-divided wave plate 10 can be obtained.

  The resin of the base material a is preferably an optical resin material such as polyolefin resin or norbornene resin. Specifically, for example, Appel manufactured by Mitsui Chemicals, Arton manufactured by JSR Co., Ltd., Nippon Zeon Co., Ltd. ZEONOR, ZEONEX, etc. manufactured by KK can be used.

  The upper mold b and the lower mold c are formed by, for example, applying a resist uniformly on a mold base made of glass to form a resist mask, and then drawing a predetermined fine pattern by an electron beam, It can be manufactured by forming the concavo-convex portions b1 and c1 by performing dry etching such as plasma on the mold substrate on which the fine pattern is formed. This electron beam drawing can be performed by an electron beam drawing apparatus proposed by the present inventors in, for example, Japanese Patent Application Laid-Open Nos. 2004-107793 and 2004-54218. Thereby, a desired drawing pattern can be formed on the resist film with high accuracy on the order of submicrons by three-dimensional drawing with an electron beam.

  As described above, the area-dividing wave plate 10 having fine periodic structures with different directions in the divided areas such as the first area 11 and the second area 12 in FIG. 1 is manufactured by the imprint method. However, at the time of releasing (S06), the convex portions 15a and 16a intersecting the fine periodic structure portions 15 and 16 at the boundary portion 13 between the first region 11 and the second region 12 are convex. In this way, a protruding portion 13a as shown in FIG. 2B is formed. In this way, the protruding portion 13a can be formed along the boundary portion 13 without special measures for forming the protruding portion 13a in the molds b and c, and the boundary in the region-dividing wave plate 10 can be formed. The visual recognition part which can visually recognize the part 13 can be comprised.

  3A to 3C can be manufactured by the imprint method in the same manner as in FIGS. 4 and 5 described above. Since the inclined sides 61a and 62a, 71a and 72a, 81a and 82a of each region located at each boundary are along the directions of the fine periodic structure portions 65 and 66, 75 and 76, 85 and 86, respectively, the mold release is performed. The process is performed smoothly and stably, and the load on the mold and the substrate is reduced at the time of mold release.

  That is, when the mold release is performed in a direction perpendicular to the plane of the fine periodic structure, resin clogging is likely to occur, and therefore, the mold release is performed so as to proceed substantially parallel to the plane of the fine periodic structure. Since the peeling at the inclined side proceeds along the direction of the fine periodic structure portion, the mold release is performed smoothly and stably.

  Moreover, at the time of the above release, peeling is started from the apex t of the inclined sides 61a and 62a, 71a and 72a, 81a and 82a of the region-divided wave plate of FIGS. 3 (a) to 3 (c). Separation progresses from the start point (vertex t) along the direction of each inclined side and each fine periodic structure, so that the mold release is performed stably, thereby enabling molding with high reproducibility.

  Next, a usage example of the region division type wave plate 10 as shown in FIG. 1 will be described with reference to FIG. FIG. 6 is a diagram schematically showing an optical system in which the region division type wavelength plate 10 of FIG. 1 is arranged.

  The region division type wave plate 10 of FIG. 6 is configured such that the first region 11 on both sides functions as a -1/4 wavelength plate and the second region 12 on both sides functions as a +1/4 wavelength plate. Yes. As shown in FIG. 6, the region-dividing wave plate 10 is disposed between the lenses 31 and 33, and the polarizing plate 32 is disposed between the region-dividing wave plate 10 and the lens 33.

  In the optical system of FIG. 6, linearly polarized light (wavelength λ) indicated by a solid line from the lens 31 passes through the first regions 11 and 11 (−1/4 wavelength plate) of the region-dividing wavelength plate 10 − A phase difference of 90 ° -90 ° is given, the polarization direction is changed, and a phase difference of + 90 ° + 90 ° is given by passing through the second regions 12 and 12 (+1/4 wavelength plate), and the polarization direction Changes and passes through the polarizing plate 32. In this case, as shown by a broken line, when the light is focused on, for example, in front of the region-dividing wave plate 10, the light passes through the second region 12 and the first region 11 of the region-dividing wave plate 10, Further, the light passes through the first region 11 and the second region 12, the polarization direction does not change, and does not pass through the polarizing plate 32. On the other hand, as shown by the solid line in FIG. 6, the light from the lens 31 is focused between both surfaces of the region-dividing wavelength plate 10 to give a phase difference of ± 180 ° as described above. The polarization direction changes and passes through the polarizing plate 32.

  As described above, the region-divided wave plate 10 is arranged so that the light from the lens 31 is focused between both surfaces of the region-divided wave plate 10, for example, at a predetermined depth position of a multilayer disk or the like. Only reflected light can be transmitted. When two wave plates are arranged in the optical system of FIG. 6, each position of the two wave plates must be adjusted so as to focus between the two wave plates, which makes the adjustment complicated. Although it takes time to assemble, it is only necessary to adjust the position of the region-dividing wave plate 10 by providing the function of a wave plate on both surfaces of one region-dividing wave plate 10 as shown in FIG. Adjustment is easy and assembly is easy, which is preferable.

  Further, since the position of the boundary portion 13 of the region-dividing wave plate 10 can be seen with the naked eye, the position adjustment of the boundary portion 13 is also easy. Further, by configuring the region-dividing wave plate 10 as shown in FIGS. 3A to 3C, the direction of the fine periodic structure portion can be seen with the naked eye, so that the direction of the fine periodic structure portion can be easily adjusted. Become.

  In addition, in order to develop a uniform retardation characteristic in a relatively wide wavelength band of 400 nm to 800 nm in the region-divided wave plate of FIGS. The height h / the width w of the convex portion (see FIG. 1 (c)) is required to be about 5 or more. However, when forming a domain-divided wave plate having such a high aspect ratio, it is difficult to release after molding However, according to the second embodiment, the mold release is performed smoothly and stably as described above, and the load on the mold and the substrate is reduced at the time of mold release. A region-dividing wave plate having a fine periodic structure with a high aspect ratio can be manufactured with high yield.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the boundary portions 63, 73, and 83 in FIGS. 3A to 3C are configured in the same manner as in FIGS. 2A and 2B, and the boundary portions 63, 73, and 83 are configured to be visible. This may facilitate adjustment to match the boundary between the divided areas.

  3A to 3C are configured to have a rectangular or polygonal shape in plan, and a fine periodic structure portion is formed on almost the entire surface. The present invention is not limited to this, and may have other shapes such as a triangular shape, a region without a fine periodic structure portion may exist outside the fine periodic structure portion, and the entire planar shape may be a circle. The plate-like region without the fine periodic structure portion may exist on the outer periphery of the disc. For example, each side 61a, 62a, 71a, 71c, 72a, 72c, FIG. 81a and 82a can be comprised so that it may be located in the boundary of the area | region with a fine periodic structure part, and the area | region without a fine periodic structure part.

  Moreover, although each region division | segmentation type | mold wavelength plate of FIG. 1, FIG. 3 has a fine periodic structure formed in both surfaces, this invention is not limited to this, You may form in only one side.

  Further, a mold that has been devised in advance so as to form the protruding portion 13a of FIG. .

It is the typical top view (a) of the area | region division type | mold wavelength plate by 1st Embodiment, its typical sectional drawing (b), and the enlarged typical fragmentary sectional view (c). FIG. 2A is an enlarged plan view of a main part showing the vicinity of a boundary part of the region-divided wave plate of FIG. 1A, and FIG. The typical top view (a) of the area | region division type | mold wavelength plate by 2nd Embodiment, the same top view (b) which shows the other structural example, and the same top view which shows the further another structural example ( c). It is a sectional side view which shows roughly the principal part of the imprint apparatus for performing the imprint method by this Embodiment. It is a flowchart for demonstrating process S01-S06 of the manufacturing method by the imprint method by this Embodiment. It is a figure which shows schematically the optical system which has arrange | positioned the area | region division type | mold wavelength plate 10 of FIG. It is a top view of the boundary part vicinity of the conventional area | region division type | mold wavelength plate.

Explanation of symbols

10 area-divided wave plate 11 first area (divided area)
12 Second area (divided area)
13 boundary part 13a protrusion part 14 base material 15, 16 both fine periodic structure parts 15a, 16a convex part 15b, 16b concave part 17, 18 fine periodic structure part 17a convex part 17b concave part 60, 70, 80 area division type wavelength plate 61, 71, 81 First area (divided area)
61a, 71a, 81a Inclined side 62, 72, 82 Second area (divided area)
62a, 72a, 82a Inclined sides 63, 73, 83 Boundary portions 65, 75, 85 Fine periodic structure portions 66, 76, 86 Fine periodic structure portions b Upper mold c Lower mold

Claims (7)

An area division type wavelength plate having a fine periodic structure extending in a predetermined direction in each area divided into at least two areas,
A visual recognition part capable of visually recognizing the boundary between the divided regions and / or the direction of the fine periodic structure,
The region division type wavelength plate, wherein the visual recognition part is formed so as to be along the boundary part and / or the direction.   The region division type wavelength plate according to claim 1, wherein the boundary portion is formed so as to protrude from a surrounding fine periodic structure.   The region division type wavelength plate according to claim 1 or 2, wherein at least one side of a boundary of the fine periodic structure with respect to a region where the fine periodic structure does not exist substantially coincides with the direction of the fine periodic structure.   The region division type wavelength plate according to any one of claims 1 to 3, wherein directions of the fine periodic structures of the divided regions are different.   The region according to any one of claims 1 to 4, wherein the divided first region functions as a -1/4 wavelength plate, and the divided second region functions as a +1/4 wavelength plate. Divided wave plate.   6. The region division type wave plate according to claim 1, which has a broadband characteristic within a wavelength range of 400 to 800 nm.   A method for manufacturing a region-dividing wave plate, comprising manufacturing the region-dividing wave plate according to any one of claims 1 to 7 by an imprint method.

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