JP2017161888A - Reflection type display device, injection molding die, and method for manufacturing reflection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type display device which eliminates a cutting step, and can greatly reduce a manufacturing step and can improve a yield; an injection molding die for manufacturing the reflection type display device; and a method for manufacturing the reflection type display device.SOLUTION: A reflection type display device includes: a substrate 11 in which a surface of a side face 11a has arithmetic average roughness of 5 μm or more and that is injection molded and is made from a cycloolefin-based resin; and a vapor deposition film 12 that is formed on a first surface of the substrate 11 and is made from SiOx (x is 1 or more and 2 or less). Two corner portions on one side of the substrate 11 have curved portions 11c with a radius of 1 mm or more, respectively, and two corner portions on the other side in an opposite side to one side of the substrate 11 have bent edge portions, respectively. In a width dimension of the side face of the substrate 11, there is a step portion in which a second face side portion is formed so as to be recessed with respect to a first face side portion, with a parting line arranged in such a ratio that the first face side portion is larger than the second face side portion in an opposite side to the first face side portion as a border.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a reflective display device that can be manufactured by injection molding without cutting, an injection mold, and a method for manufacturing the reflective display device.

  Patent Document 1 discloses that when a combiner is cut into a predetermined shape, the surface is roughened simultaneously with the cutting according to cutting conditions such as the number of rotations and feed speed of the cutting jig.

JP 2000-39581 A

  The present disclosure relates to a reflective display device that eliminates a cutting process, can greatly reduce the manufacturing process, and can improve yield, an injection mold for manufacturing the reflective display device, and a method of manufacturing the reflective display device I will provide a.

  The reflective display device according to the present disclosure includes a substrate made of cycloolefin resin having an arithmetic mean roughness of 5 μm or more on a side surface and an injection-molded cycloolefin resin, and SiOx (x Includes a vapor deposition film composed of 1 or more and 2 or less. Two corners on one side of the substrate each have a curved portion with a radius of 1 mm or more. Each of the two corners on the other side opposite to the one side of the substrate has a bent edge. In the width dimension of the side surface of the substrate, the first surface is bordered by a parting line arranged at a ratio such that the first surface side portion is larger than the second surface side portion opposite to the first surface side portion. The second surface side portion has a step portion formed to be recessed with respect to the side portion.

  The reflective display device, the injection mold for manufacturing the reflective display device, and the reflective display device manufacturing method according to the present disclosure can eliminate the cutting process, greatly reduce the manufacturing process, and improve the yield. It is.

Plan view of a combiner as an example of a reflective display device in Embodiment 1 Front view of the combiner in the first embodiment III-III sectional view of FIG. Right side view of the combiner in the first embodiment Enlarged view of portion V in FIG. Enlarged view of the VI part in FIG. Longitudinal sectional view of the injection mold of the combiner in the first embodiment Explanatory drawing for demonstrating injection molding of the curved part which is one corner | angular part of the upper side of the board | substrate of the combiner in Embodiment 1. FIG. Explanatory drawing of arrangement | positioning of the gate in the injection mold of the combiner in Embodiment 1 Explanatory drawing of arrangement | positioning of the gate in the injection mold of the combiner in Embodiment 1 Explanatory drawing of arrangement | positioning of the gate in the injection mold of the combiner in Embodiment 1 Explanatory drawing of arrangement | positioning of the gate in the injection mold of the combiner in Embodiment 1 Explanatory drawing of the manufacturing process of the combiner in Embodiment 1. Explanatory drawing of the manufacturing process of the combiner in Embodiment 1 following the process of FIG. 13A. Explanatory drawing of the manufacturing process of the combiner in Embodiment 1 following the process of FIG. 13B. Explanatory drawing of abnormal mold opening at the time of injection molding of the combiner of the comparative example Explanatory drawing of another abnormal mold opening at the time of injection molding of the combiner of the comparative example Explanatory drawing of another abnormal mold opening at the time of injection molding of the combiner of the comparative example

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

(Task)
The manufacturing process of the conventional combiner is as follows.

  As a first step, an intermediate product that is slightly larger than the desired size and shape as a substrate is molded from a polycarbonate material.

  In the second step, the intermediate product is immersed in a liquid of a hard coat agent for forming a hard coat film, and a hard coat layer is formed on the entire surface of the intermediate product. At this time, it is difficult to control the lifting speed of the intermediate product to form hard coat films having a uniform thickness on both the front and back surfaces of the intermediate product. For this reason, the yield is not good due to unevenness of the thickness of the hard coat film or generation of a liquid pool on the outer peripheral side surface.

  As a third step, the hard coat film is dried.

  As a fourth step, the outer peripheral surface of the intermediate product on which the hard coat layer is formed is cut to cut out as a substrate having a predetermined dimension, and the cut outer peripheral side surface is roughened. Thereby, the outer peripheral reflection light is reduced, and an antireflection effect is provided.

  Therefore, four steps are required as a conventional combiner manufacturing process.

  Therefore, in the present disclosure, such a large number of steps are greatly reduced. The present disclosure provides a reflective display device capable of manufacturing a reflective display device by injection molding without cutting, capable of reducing the manufacturing process and improving the yield, and an injection mold for manufacturing the reflective display device, and A method for manufacturing a reflective display device is provided.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to FIGS.

[1-1. Basic configuration of combiner]
FIG. 1 is a plan view of a combiner 10 as an example of the reflective display device according to the first embodiment. FIG. 2 is a front view of the combiner 10 according to the first embodiment. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a right side view of the combiner 10. FIG. 5 is an enlarged view of a portion V in FIG. FIG. 6 is an enlarged view of a portion VI in FIG.

  The combiner 10 includes a substrate 11 and a vapor deposition film 12.

  The board | substrate 11 is comprised by the rectangular plate-shaped member injection-molded with the material made from cycloolefin resin. The entire surface of the upper and lower side surfaces 11a of the substrate 11 is a rough surface 11g having an arithmetic average roughness of 5 μm or more. This can be formed by embossing a cavity inner surface portion corresponding to the side surface 11a of the mold at the time of injection molding, for example, by using a textured portion to be described later. As a result, roughening in post-processing is not necessary.

  As an example, three attachment holes 11h pass through the lower portion (attachment side portion) of the substrate 11.

  The vapor deposition film 12 is made of SiOx (x is not less than 1 and not more than 2) formed on the surface 11b of the substrate 11, and constitutes a surface on which an image is displayed.

  Conventionally, polycarbonate is used as the material of the substrate. Since a polycarbonate substrate is easily scratched, a hard coat layer is required. On the other hand, since a polycarbonate substrate has a hygroscopic property, for example, moisture may enter the substrate from a cut outer peripheral side surface and cracks may occur in the substrate. In addition, as a property of the polycarbonate substrate, a large amount of birefringence is generated inside the substrate, and when the substrate is viewed through polarized glasses, the display on the display unit may be black and may not be visible. Therefore, in the present disclosure, the material of the substrate 11 is changed from polycarbonate to cycloolefin resin. As a result, the surface hardness of the substrate 11 is increased to make it difficult to be damaged, and a hard coat layer is not required. Moreover, since the water absorption is 0.01% or less as a property of the cycloolefin resin itself, an improvement in moisture resistance can be expected. Further, the substrate 11 has an effect that the birefringence is small, and the conventional problem can be solved.

  As an example, the thickness of the substrate 11 is 3 mm.

[1-2. Curved part of substrate]
The two upper corners of the substrate 11 are respectively hemispherical curved portions 11c having a radius of 1 mm or more. The radius of the curved portion 11 c is set to be smaller than half the width dimension W or the height dimension H of the substrate 11. When the radius is larger than these numerical values, the curved portion 11c cannot be formed. In addition, when the radius is smaller than 1 mm, functions such as ease of mold removal as the bending portion 11c cannot be expected. That is, by making the two corners on the upper side of the substrate 11 be curved portions 11c, it is easy to release from the mold without being caught by the mold when the mold is opened.

[1-3. Board edge]
The two lower corners of the substrate 11 are not curved portions, but are edge portions 11d extending in, for example, the X-axis direction, the Y-axis direction, and the Z-axis direction orthogonal to each other.

  This is due to the following reason. That is, the internal stress of the resin concentrates on the edge portion of the injection molded product that is the substrate 11. For this reason, the pressure of injection and holding pressure at the time of injection molding is applied to the edge portion (for example, the edge portion 11d) rather than the other portion (for example, the curved portion 11c), the internal stress is increased, and the mold It becomes easy to get caught in. Therefore, the radius of 1 mm or more is applied to the two corners on the upper side of the substrate 11, which is the portion on the display unit side of the substrate 11 that cannot be ejected by the ejector pins, so that the edge stress is not exerted on the injection molded product as much as possible. The curved portion 11c. On the other hand, the lower mounting side portion of the substrate 11 that can be projected by the ejector pins when the mold is opened, in other words, the two lower corners of the substrate 11 are defined as edge portions 11d. This makes it easy to get caught in the mold. In other words, it is difficult to get out of the mold. Thereby, the injection molded product can be held not in the fixed mold but in the movable mold by using the edge portion stress acting on the injection molded product.

[1-4. Arrangement of parting line PL (Parting line)]
FIG. 7 is a longitudinal sectional view of the injection mold of the combiner in the first embodiment. In order to prevent the injection molded product 30 as the substrate 11 from being taken on the fixed mold 22 side, the amount of product applied to the movable mold 21 side is surely made larger than the amount of product applied to the fixed mold 22 side. Here, the product application amount is the side application amount when divided by the parting line PL, which has the greatest influence during mold release, and is the side area of the injection molded product 30.

  For this reason, at the time of mold opening at the time of manufacture, the injection molded product 30 is not held on the fixed mold 22 side, but the injection molded product 30 is held on the movable mold 21 side. Therefore, the position of the parting line PL is brought closer to the fixed mold 22 side than the half in the side area, and most of the injection molded product 30 is supported on the movable mold 21 side. As a result, the injection molded product 30 is easily removed from the fixed mold 22.

  FIG. 8A is an explanatory diagram for explaining injection molding of the curved portion 11c, which is one corner portion on the upper side of the substrate 11 of the combiner 10 in the first embodiment, and FIG. FIG. Specifically, the parting lines PL are arranged in such a ratio that the front surface portion 11f is larger than the back surface portion 11r in the width dimension SW of the side surface 11a of the substrate 11. The substrate 11 has a step portion 11e formed with a back surface side portion 11r recessed with respect to the front surface side portion 11f with the parting line PL as a boundary. As an example of this ratio, the front side portion 11f: the back side portion 11r = 2: 1. Here, the front surface portion 11 f means a portion molded by the movable mold 21 of the injection mold 20, and the back surface portion 11 r is molded by the fixed mold 22 of the injection mold 20. Means part.

[1-5. Parting line PL steps]
When an injection-molded product that is the combiner substrate 11 is manufactured with an injection-molding mold 20 composed of a movable mold 21 and a fixed mold 22, there is always a parting line PL at the clamping part of both molds. it can. Actually, a three-dimensional step is formed in the parting line PL, but it is necessary to devise a method for making the parting line PL invisible from the display unit (concave surface side). Therefore, in the present embodiment, the display unit side is convex so that no step is visible from the display unit side.

  Specifically, as shown in FIG. 8, a step portion 11e is provided in the parting line PL on the outer peripheral side surface. As shown in an enlarged view of the portion surrounded by the circle in FIG. 8A in FIG. 8B, the step portion 11e has a high front surface portion 11f and a low back surface portion 11r. If comprised in this way, a level | step difference can be made invisible when it sees from the surface side part 11f side, ie, the display side, and it becomes the thing excellent in the external appearance. The step size as an example of the step portion 11e is 30 μm.

[1-6. Basic structure of injection mold]
As shown in FIG. 7, the injection mold 20 includes a movable mold 21 and a fixed mold 22. A cycloolefin resin is injected into the injection mold 20 and the substrate 11 of the combiner 10 is injection molded.

  The movable mold 21 and the fixed mold 22 have cavities 21a and 22a, respectively. Each of the cavities 21a and 22a has a matte portion 21b and 22b, a curved portion forming concave portion 21c and 22c, and an edge portion forming concave portion 21d and 22d, respectively.

  The satin portions 21b and 22b are for forming the surface of the side surface 11a of the substrate 11 into a rough surface 11g having an arithmetic average roughness of 5 μm or more. The satin portions 21b and 22b are arranged on the entire circumference of the side surfaces of the cavities 21a and 22a.

  The concave portions 21c and 22c for forming the curved portion are for forming the curved portion 11c having a radius of 1 mm or more as the two upper corner portions of the substrate 11, respectively. The curved portion forming recesses 21c and 22c are arranged at two corners on the upper side of the substrate 11 of the cavities 21a and 22a.

  The edge portion forming recesses 21 d and 22 d are for forming bent edge portions 11 d as the two lower corner portions of the substrate 11. The edge forming recesses 21d and 22d are arranged at two corners on the lower side of the substrate 11 of the cavities 21a and 22a.

  The movable mold 21 and the fixed mold 22 are arranged at a ratio such that the front surface portion 11f is larger than the rear surface portion 11r in the width SW of the side surface 11a of the substrate 11 with the parting line PL as a boundary. ing. The cavity 21a of the movable mold 21 further has a recess 21e for forming a step portion 11e formed by recessing the back surface portion 11r with respect to the front surface portion 11f with the parting line PL as a boundary. .

  In the lower part of FIG. 7, a runner 25 and a sprue 26 are illustrated via a gate 24. The runner 25 and the sprue 26 are necessary for the resin to flow through. The resin flows to the sprue 26, the runner 25, the gate 24, and the product.

[1-7. Injection Mold Gate Arrangement]
9-12 is explanatory drawing of arrangement | positioning of the gate 24 in the injection mold of the combiner in Embodiment 1. FIG. Since the left and right side portions and the upper portion of the substrate 11 are the gate setting impossible region 31, the gate 24 is disposed below the substrate 11. At this time, as shown in FIGS. 9 and 10, when the mounting hole 11h is in the center of the lower portion of the substrate 11, the gate 24 is arranged on either the left or right side (dotted line or solid line) of the mounting hole 11h. In FIG. 10, the gate 24 is shown only on the right side, but the gate 24 may be arranged on the left side. Further, as shown in FIGS. 11 and 12, when there is no mounting hole 11h at the center of the lower portion of the substrate 11, the gate 24 may be disposed at the center position.

  9 and 11 show a side gate having a uniform width, which is widely used as the gate 24. 10 and 12 show a gate having a fan gate shape as the gate 24.

  9 to 12, the hatched area is the display area 29 of the reflected image.

[1-8. Manufacturing process of combiner 10]
The manufacturing process of the combiner 10 is as follows. FIG. 13A is an explanatory diagram of the manufacturing process of the combiner 10 in the first embodiment. FIG. 13B is an explanatory diagram of the manufacturing process of the combiner 10 in the first embodiment, following the process of FIG. 13A. FIG. 13C is an explanatory diagram of the manufacturing process of the combiner 10 in the first embodiment, following the process of FIG. 13B.

  First, the movable mold 21 of the injection mold 20 is moved and brought into contact with the fixed mold 22 to clamp the movable mold 21 and the fixed mold 22. The substrate 11 of the combiner 10 is injection-molded with a cycloolefin resin (see FIG. 13A). If necessary, a known release agent may be coated in advance on the inner surface of the fixed mold 22 before clamping.

  Next, since the ratio of the amount of product applied to the movable mold 21 is larger than that of the fixed mold 22, the two curved portions 11 c of the substrate 11 are held in the curved portion forming concave portion 21 c of the movable mold 21. Since the two edge portions 11 d of the substrate 11 are caught in the edge portion forming recess 21 d of the movable mold 21 by the internal stress, the injection molded product 30 is held by the movable mold 21. Thus, in a state where the injection molded product 30 is held by the movable mold 21, the movable mold 21 is moved backward with respect to the fixed mold 22 to perform mold opening (see FIG. 13B).

  Next, the ejector pin 33 is driven to eject the injection molded product 30 from the movable mold 21 (see FIG. 13C).

  Next, a vapor deposition film 12 for half mirror made of SiOx (x is 1 or more and 2 or less) is vapor-deposited on the concave surface on the display unit side of the substrate 11 of the injection molded product 30. At the same time, unnecessary parts such as the gate 24 are removed. Thereafter, if necessary, a thin film (not shown) of an anti-finger agent is formed on both sides with a thickness of 5 nm, for example. At this time, the outer peripheral side surface is also covered by vapor deposition from both sides of the front surface side and the back surface side. As a result, the anti-finger effect can be produced even on the outer peripheral side surface.

  At the time of forming the vapor deposition film for the half mirror, it is controlled so that the vapor deposition film 12 is not formed on the curved portion 11c on the outer peripheral side surface to prevent reflection from the outer peripheral side surface.

  Conventionally, since it is cutting, a curved portion may not be sufficiently formed on the outer peripheral side surface. When the edge is standing, a part of the deposited film adheres, and there is a problem due to reflection.

  Thus, the manufacture of the combiner 10 is completed.

[1-9. Abnormal mold release in injection mold]
As described above, the curved portion 11c is provided on the upper portion of the substrate 11 on the display portion side so as not to accumulate a molded product stress that is disadvantageous at the time of mold release. On the other hand, an edge portion 11d is provided at the lower portion of the mounting portion side of the substrate 11 so as to be always held on the movable mold side.

  On the other hand, a problem when there is no such configuration will be described. As a comparative example, it is assumed that the movable mold 21A and the fixed mold 22A are not formed with curved portions and are all edge portions. In addition, it is assumed that the parting line PL has a front side portion and a back side portion of 1: 1.

  FIG. 14A is an explanatory diagram of abnormal mold opening at the time of injection molding of the combiner of the comparative example. In the abnormal mold opening state shown in FIG. 14A, the upper edge portion of the injection molded product 35 is caught by the cavity 22Aa of the fixed mold 22A. On the other hand, the lower edge portion of the injection molded product 35 is caught in the cavity 21Aa of the movable mold 21A. As a result, the upper part of the injection molded product 35 is held by the fixed mold 22A, and the lower part of the injection molded product 35 is held by the movable mold 21A, and a tensile stress acts on the injection molded product 35. In such a state, a mold release failure occurs due to sticking of the image display surface of the combiner and the fixed mold surface, or interference with the mold of the combiner image display surface edge, and the image surface shape of the combiner An abnormality will occur.

  In order to prevent the abnormal mold opening state of FIG. 14A, the curved portion 11c is formed at the two upper corners of the substrate 11, and the ratio of the amount of product applied to the movable mold 21 is the product of the fixed mold 22. Make it larger than the ratio of the applied amount. Thereby, it is easy to get out of the fixed mold 22 and to be held by the movable mold 21.

  Next, FIG. 14B is explanatory drawing of another abnormal mold opening at the time of injection molding of the combiner of a comparative example. In the abnormal mold opening state shown in FIG. 14B, the lower edge portion of the injection molded product 35 is caught in the cavity 22Aa of the fixed mold 22A, contrary to FIG. 14A. On the other hand, the upper edge portion of the injection molded product 35 is caught by the cavity 21Aa of the movable mold 21A. As a result, the lower part of the injection molded product 35 is held by the fixed mold 22A, and the upper part of the injection molded product 35 is held by the movable mold 21A, and a tensile stress acts on the injection molded product 35. In such a state, a mold release failure occurs due to sticking of the image display surface of the combiner and the fixed mold surface, or interference with the mold of the combiner image display surface edge, and the image surface shape of the combiner An abnormality will occur.

  In order to prevent the abnormal mold opening state shown in FIG. 14B, the edge portion 11d is formed at the two lower corners of the substrate 11, and the ratio of the amount of product applied to the movable mold 21 is the product of the fixed mold 22. Make it larger than the ratio of the applied amount. Therefore, a larger stress acts on the edge portion 11d on the movable mold 21 side than on the fixed mold 22 side, and the mold release resistance with respect to the movable mold 21 is increased more easily than on the fixed mold 22 side. Therefore, it is easy to come out of the fixed mold 22 and to be easily held by the movable mold 21, and the abnormal mold opening state shown in FIG. 14B can be prevented.

  In the present embodiment, since the lower portion of the substrate on the movable mold 21 side is later projected by the ejector pin 33, the mold is stably released even if it is firmly eaten on the movable mold 21 side. Things are possible.

  Next, FIG. 14C is an explanatory diagram of still another abnormal mold opening at the time of injection molding of the combiner of the comparative example. The abnormal mold opening state shown in FIG. 14C is that when the injection molded product 35 is held on the movable mold 21 and opened, and then the ejector pin 36 is used to remove the injection molded product 35 from the movable mold 21. The upper part of the substrate of the injection molded product 35 is caught in the curved portion forming recess 21c of the movable mold 21, and unnecessary stress acts on the injection molded product 35. In such a state, sticking of the image display surface of the combiner and the movable mold surface or interference with the mold of the edge of the combiner image display surface causes a protruding defect, resulting in the shape of the combiner image surface. Abnormality will occur.

  In order to prevent the abnormal product ejection state of FIG. 14C, the balance at the time of ejection is important. By providing the curved portion 11 c at the upper corner of the substrate 11, it is easy to release from the movable mold 21. On the other hand, it is only necessary to make it difficult to release the mold by providing the edge 11d at the lower corner of the substrate 11. With this configuration, when the ejector pin 36 is projected, the projecting force is first transmitted to the upper side of the substrate 11 that is easy to release, and then the lower side of the substrate 11 is projected. it can.

  In this comparative example, there is also a problem that fingerprints and the like are easily attached because there is no curved portion at the corner of the upper portion of the substrate and an edge portion is provided. However, such a problem is also solved by providing the curved portion 11c.

[1-10. Effect]
As described above, the reflective display device according to the present embodiment, the injection mold for manufacturing the reflective display device, and the manufacturing method of the reflective display device eliminate the cutting process, and perform the injection molding process and the vapor deposition film. It can be manufactured only with the forming process, and the manufacturing process can be greatly reduced and the yield can be improved.

  In particular, the step portion 11e is provided in the parting line PL on the outer peripheral side surface of the substrate 11 of the injection molded product 30, and the front surface portion 11f is high and the back surface portion 11r is low. With this configuration, the step of the parting line PL can be made invisible when viewed from the surface side portion 11f side, that is, the display side, and the appearance is excellent.

  Further, by providing the curved portions 11 c at the two upper corners of the rectangular plate-shaped substrate 11 in the injection molded product 30, it is easy to come out of the fixed mold 22. Further, in the width dimension SW of the side surface 11a of the substrate 11, the ratio is such that the front surface side portion 11f is larger than the back surface side portion 11r. For this reason, the curved portions 11 c at the two upper corners of the substrate 11 are held in the curved portion forming concave portion 21 c of the movable mold 21. On the other hand, the two edge portions 11d on the lower side of the substrate 11 are caught in the edge forming recess 21d of the movable mold 21 by the internal stress. For this reason, the injection molded product 30 is held by the movable mold 21. With such a configuration, the mold can be opened by moving the movable mold 21 backward with respect to the fixed mold 22 while the injection molded product 30 is held by the movable mold 21. In addition, when the injection molded product 30 is ejected from the movable mold 21 with the ejector pins 33, the curved portions 11 c are provided at the two upper corners of the substrate 11 in the injection molded product 30, so that it can be easily pulled out of the movable mold 21. doing. After the upper part of the injection molded product 30 is pulled out from the movable mold 21, the lower part of the injection molded product 30 is pulled out from the movable mold 21 by the protruding force of the ejector pin 33. Therefore, the injection molded product 30 can be moved to the movable mold without causing any abnormality such as sticking between the image display surface of the combiner and the movable mold surface or an abnormality in the shape of the image plane of the combiner. 21 can be stably taken out.

  As described above, in the reflective display device corresponding to the combiner 10 of the present embodiment, the surface 11a has an arithmetic average roughness of 5 μm or more and the injection-molded cycloolefin resin substrate 11. And a vapor deposition film 12 made of SiOx (x is 1 or more and 2 or less) formed on the first surface corresponding to the surface 11b of the substrate 11. Two corners on one side corresponding to the upper side of the substrate 11 each have a curved portion 11c having a radius of 1 mm or more. Two corners on the other side corresponding to the lower side opposite to the one side of the substrate 11 each have a bent edge portion 11d. In the width dimension of the side surface 11a of the substrate 11, the first surface side portion corresponding to the front surface side portion 11f is larger than the second surface side portion corresponding to the back surface side portion 11r opposite to the first surface side portion. Step part 11e formed by recessing a second surface side portion corresponding to back surface side portion 11r with respect to a first surface side portion corresponding to surface surface portion 11f with a parting line PL arranged at a proper ratio as a boundary. Have

  As a result, the cutting process is eliminated, the manufacturing process can be greatly reduced, and the yield can be improved.

  Further, the radius of the curved portion 11 c may be smaller than half the width dimension W or the height dimension H of the substrate 11. This makes it easier to release the substrate 11 from the mold without being caught by the mold when the mold is opened.

  The injection mold 20 of the reflective display device corresponding to the combiner 10 of the present embodiment includes a movable mold 21 and a fixed mold 22, and is a reflective type equivalent to the combiner 10 made of cycloolefin resin. The substrate 11 of the display device is injection molded. Further, the cavities 21a and 22b of the movable mold 21 and the fixed mold 22 are formed on the upper side of the substrate 11 with the matte portions 21b and 22b that mold the surface of the side surface 11a of the substrate 11 to an arithmetic average roughness of 5 μm or more. Curved portion forming recesses 21c and 22c forming curved portions 11c each having a radius of 1 mm or more as two corresponding corners on one side, and two on the other side corresponding to the lower side opposite to one side of the substrate It has edge part formation recessed parts 21d and 22d which form the edge part 11d each bent as a corner | angular part. Further, the movable mold 21 and the fixed mold 22 have a first surface side portion corresponding to the surface side portion 11f in the width dimension of the side surface 11a of the substrate 11 with the parting line PL as a boundary. It is arrange | positioned in the ratio which becomes larger than the 2nd surface side part corresponded to the back surface side part 11r on the opposite side. In addition, a recess that forms a step portion 11e formed by recessing a second surface side portion corresponding to the back surface side portion 11r with respect to the first surface side portion corresponding to the front surface side portion 11f with the parting line PL as a boundary. The cavity 21a of the movable mold 21 has 21e.

  As a result, the cutting process is eliminated, the manufacturing process can be greatly reduced, and the yield can be improved.

  Further, the manufacturing method of the reflective display device corresponding to the combiner 10 of the present embodiment uses the injection mold 20 to manufacture the reflective display device corresponding to the combiner 10. The manufacturing method of the present embodiment includes a step of clamping the movable mold 21 and the fixed mold 22 of the injection mold 20 and injection-molding with a cycloolefin resin to form the substrate 11, and the movable mold 21 is a step of releasing the movable mold 21 from the fixed mold 22 while holding the injection-molded substrate 11. Further, a step of taking out the substrate 11 from the movable mold 21 and a reflective film corresponding to the combiner 10 by forming a deposited film 12 made of SiOx (x is 1 or more and 2 or less) on the first surface corresponding to the surface of the substrate 11. Manufacturing a mold display device.

  As a result, the cutting process is eliminated, the manufacturing process can be greatly reduced, and the yield can be improved.

(Other embodiments)
As described above, the first embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. In addition, it is possible to combine the components described in Embodiment 1 to form a new embodiment.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range. For example, any of the above-described various embodiments or modifications can be combined as appropriate to achieve the respective effects. Moreover, the combination of embodiment, the combination of Examples, or the combination of Embodiment and an Example is possible. Furthermore, combinations of features in different embodiments or examples are possible.

  A reflective display device, an injection mold, and a reflective display device manufacturing method according to the present disclosure are arranged in the vicinity of a window of a vehicle, a ship, an aircraft, etc., and emit light emitted from a display device to an observer. It is applicable to a combiner that reflects toward the screen.

DESCRIPTION OF SYMBOLS 10 Combiner 11 Board | substrate 11a Side surface 11b Surface 11c Curved part 11d Edge part 11e Step part 11f Surface side part 11g Rough surface 11h Mounting hole 11r Back side part 12 Vapor deposition film 20 Injection mold 21 Movable mold 21a Cavity 21b Peeling part 21c Recessed part forming recess 21d Edge forming recessed part 21e Recessed part 21A Movable mold 21Aa Cavity 22 Fixed mold 22a Cavity 22b Peeled part 22c Curved part forming recessed part 22d Edged part forming recessed part 22A Fixed mold 22Aa Cavity 24 Gate 25 Runner 26 Sprue 29 Display area 30 Injection molded product 31 Gate setting impossible area 33 Ejector pin 35 Injection molded product 36 Ejector pin PL Parting line SW Width dimension W Width dimension

Claims (4)

A substrate made of cycloolefin-based resin having an arithmetic mean roughness of 5 μm or more on the side surface and injection-molded;
A deposited film made of SiOx (x is 1 or more and 2 or less) formed on the first surface of the substrate;
Two corners on one side of the substrate each have a curved portion with a radius of 1 mm or more,
The two corners on the other side opposite to the one side of the substrate each have a bent edge portion,
In the width dimension of the side surface of the substrate, on the border of the parting line arranged at a ratio such that the first surface side portion is larger than the second surface side portion opposite to the first surface side portion, The second surface side portion has a step portion formed to be recessed with respect to the first surface side portion,
Reflective display device. The radius of the curved portion is smaller than half the width or height of the substrate.
The reflective display device according to claim 1. An injection mold for a reflective display device comprising a movable mold and a fixed mold, and injection-molding a substrate of the reflective display device with a cycloolefin resin,
Each cavity of the movable mold and the fixed mold is
A satin portion for shaping the surface of the side surface of the substrate to an arithmetic average roughness of 5 μm or more;
A concave portion for forming a curved portion that forms a curved portion having a radius of 1 mm or more as two corners on one side of the substrate;
And having an edge forming recess for forming bent edge portions as two corners on the other side opposite to the one side of the substrate,
The movable mold and the fixed mold have a first surface side portion opposite to the first surface side portion in the width dimension of the side surface of the substrate with a parting line as a boundary. It is arranged in a ratio that is larger than the part,
The cavity of the movable mold has a recess that forms a step formed by recessing the second surface side portion with respect to the first surface side portion with the parting line as a boundary.
Injection mold for reflective display devices. A reflection type display device manufacturing method for manufacturing a reflection type display device using the injection mold of the reflection type display device according to claim 3,
Clamping the movable mold and the fixed mold of the injection mold, and forming the substrate by injection molding with a cycloolefin resin;
A step of releasing the movable mold from the fixed mold while the movable mold holds the injection-molded substrate;
Removing the substrate from the movable mold;
Forming a deposited film made of SiOx (x is 1 or more and 2 or less) on the first surface of the substrate to manufacture the reflective display device;
A method of manufacturing a reflective display device having

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