JP4142485B2 - Mold equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides a mold assembly capable of providing an optical element having extremely good optical performance by improving the positional accuracy of the optical surface.In placeRelated.
[0002]
[Prior art]
Conventionally, lenses and prisms for cameras or head mounted displays with optical functional surfaces such as aspheric surfaces, spherical surfaces, and free-form surfaces are generally manufactured using techniques such as injection molding using thermoplastic materials. It is. However, in order to reproduce the optical surface shape and the positional relationship of these lenses and prisms as designed, very advanced machining and assembly are required for forming and positioning the cavity surface of the mold that constitutes the optical surface. Technology is required. In particular, when an optical element having an optical surface having a curvature such as a free-form surface is formed on the back reflecting surface in addition to the light incident surface and the light emitting surface, the required technology will be further advanced. Is inevitable.
[0003]
In the case of molding such an optical element composed of a plurality of optical surfaces, a method of providing a mirror core for each optical surface and individually transferring the respective optical surfaces is generally used. Therefore, in order to keep the eccentricity of the optical element within the dimensional tolerance, the fitting allowance with the core into which the mirror core is incorporated is made extremely small, or the dimensional accuracy of each mold part including the mirror core is tightened. There is a need. On the other hand, for example, in Patent Document 1, the position of the mirror surface piece can be adjusted by providing a wedge or an adjustment bolt for adjusting the position of the mirror surface piece with respect to the mold base between the mold base and the mirror surface piece. The piece can be assembled with high precision. Further, in Patent Document 1, it is possible to measure the positional deviation of the mirror surface core with an optical axis measuring device and adjust the amount of deviation in assembly with the wedge or the adjusting bolt.
[0004]
However, with this method, it is difficult to measure or adjust the misalignment of the specular core with the mold attached to the molding machine. In addition, when the mirror core is pressed with the wedge or adjustment bolt of Patent Document 1, rotational behavior is likely to occur with the pressed adjustment member as a fulcrum, and in the optical axis measuring device that measures the amount of deviation of the mirror core, the rotational behavior is Cannot be measured accurately. Therefore, assembly adjustment becomes difficult.
[0005]
As means for solving these problems, for example, a method described in Patent Document 2 has been proposed. In Patent Document 2, it is assumed that a minute movement operation of the contact member can be facilitated by using a micrometer spindle head as the position adjusting mechanism. In addition, the molding surface can be moved in parallel by using a position adjustment mechanism that combines a micrometer and a wedge block.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-77763
[Patent Document 2]
JP 2001-239552 A
[0007]
[Problems to be solved by the invention]
However, the prior art has the following drawbacks. In the method described in Patent Document 2, when the axis of the molding surface does not exist at the center of the core, for example, when the molding surface is biased to one side of the core or in the case of multiple picking, Rotational behavior cannot be suppressed with high accuracy, and play is likely to occur, and high-precision measurement is impossible.
[0008]
  The present invention has been made in view of the above-mentioned problems of the prior art, and detects the position of the core embedded in the fixed side and movable side template by means of a displacement sensor, and adjusts the core position according to the detected value. Mold assembly that can adjust the position of the core with high accuracyPlaceThe purpose is to provide.
[0009]
[Means for Solving the Problems]
  According to a first aspect of the present invention, in a mold apparatus for molding an optical element having a plurality of optical surfaces, each of the fixed side mold plate, the movable side mold plate, and the both mold plates is embedded in the mold device. A core, one of which has a clearance with the mold plate, a displacement sensor for detecting a relative position of at least one of the cores with respect to the mold plate, and the center in a direction perpendicular to the mold opening / closing direction. Core position adjusting means for allowing the core to move, and the core position adjusting means is disposed on an axis passing through the center of gravity of the core and parallel to the moving direction of the core.And the length of the surface contact portion between the core position adjusting means and the core is not less than 1/8 of the length of the side surface of the core where the core position adjusting means is provided, and the core position adjusting means The block member has a wedge shape, and the surface roughness Ra of the surface contact portion between the block member and the core and the surface contact portion between the block member and the template is 1. The taper angle of the wedge-shaped block member that is 6 μm or less is 0.5 ° or more and less than 5 °, and two or more displacement sensors face the side surface of the core. One or more are provided opposite to the side surface of the vertical core, and the displacement sensor is an eddy current displacement sensor., Mold equipment.
[0010]
  Further, according to a second aspect of the present invention, in the mold apparatus for molding an optical element having a plurality of optical surfaces, the fixed side mold plate, the movable side mold plate, and the both mold plates are respectively embedded. A core having a clearance between at least one of the mold plates, a displacement sensor for detecting a relative position of at least one of the cores with respect to the mold plate, and a direction orthogonal to the mold opening / closing direction A core position adjusting means that enables the core to move, and the core position adjusting means is a longitudinal direction of a side surface of the core in which the core position adjusting means is provided.Plurally symmetrically about the centerPlacedAnd the length of the surface contact portion between the core position adjusting means and the core is not less than 1/8 of the length of the side surface of the core where the core position adjusting means is provided, and the core position adjusting means The block member has a wedge shape, and the surface roughness Ra of the surface contact portion between the block member and the core and the surface contact portion between the block member and the template is 1. The taper angle of the wedge-shaped block member that is 6 μm or less is 0.5 ° or more and less than 5 °, and two or more displacement sensors face the side surface of the core. One or more are provided opposite to the side surface of the vertical core, and the displacement sensor is an eddy current displacement sensor., Mold equipment.
[0012]
  1st above, SecondWith this configuration, the position of the core embedded in the fixed side and movable side template is detected by the displacement sensor, and the position of the core is increased by the core position adjusting means according to the detected value. The accuracy can be adjusted.
  The core position adjusting means is arranged on an axis passing through the center of gravity of the core and parallel to the moving direction of the core as in the configuration according to the first aspect, or the second Like configuration according to aspectInsideBy arranging a plurality of symmetrically about the center in the longitudinal direction of the core side surface on which the core position adjusting means is provided, the core can be moved in parallel to suppress the rotational behavior of the core. Also aboveSecondIn the configuration according to the aspect, when it is difficult to arrange the core position adjusting means on an axis passing through the center of gravity of the core and parallel to the moving direction of the core, for example, the shape of the core is complicated, The present invention is preferably applied when it is difficult to determine the center of gravity, or when there is another member on an axis passing through the center of gravity of the core and parallel to the moving direction of the core.
[0013]
  According to the configuration according to the first and second aspects,The length of the surface contact portion between the core position adjusting means and the core is at least 1/8 of the length of the side surface of the core where the core position adjusting means is provided.Trying.
  According to this structure, generation | occurrence | production of the rotation behavior of a core can be suppressed more. As a result of intensive studies by the inventor, when the length of the surface contact portion between the core position adjusting means and the core is less than 1/8 of the length of the core side surface, the rotation during sliding of the core Since the behavior becomes large, in order to suppress the rotation behavior, the length is desirably 1/8 or more of the length of the core side surface, preferably 1/3 or more. It has become clear that it is desirable to make it preferably at least 1/2.
[0014]
  According to the configuration according to the first and second aspects,The core position adjusting means has a wedge-shaped block member.Trying.
  Moreover, according to the structure which concerns on the said 1st, 2nd aspect.The surface roughness Ra of the surface contact portion between the block member and the core and the surface contact portion between the block member and the template is 1.6 μm or less.Trying.
[0015]
According to this configuration, the core can be slid more smoothly, and the position of the core can be adjusted with high accuracy. As a result of intensive studies by the present inventors, when the surface roughness Ra exceeds 1.6 μm, the sliding resistance between the block member and the core, and between the block member and the template is large and the core does not move smoothly. In order to solve this problem, the surface roughness Ra is desirably 1.6 μm or less, and preferably 0.01 to 1.6 μm. It has become clear that it is desirable, more preferably 0.05 to 0.2 μm.
[0016]
  According to the configuration according to the first and second aspects,The taper angle of the wedge-shaped block member is 0.5 ° or more and less than 5 °Trying.
  According to this configuration, the core can be controlled with high accuracy and high resolution. As a result of intensive studies by the inventor, when the taper angle is less than 0.5 °, the amount of movement of the core is too small. If the angle is 5 ° or more, the accuracy and resolution of the core position control deteriorates. To solve this problem, it is desirable that the taper angle θ be 0.5 ° or more and less than 5 °. It has been found that it is desirable to be between 5 ° and 3 °, more preferably between 1 ° and 2 °.
[0019]
  According to the configuration according to the first and second aspects,The displacement sensor is provided with two or more facing the side surface of the core and one or more facing the side surface of the core perpendicular to the side surface.The
  According to this configuration, the sliding distance of the core position can be accurately grasped, and further, the rotational behavior of the core sliding can be grasped.
[0020]
  According to the configuration according to the first and second aspects,The displacement sensor is an eddy current displacement sensor.The
[0021]
  According to the above configuration, an optical element having high eccentricity accuracy and excellent optical performance can be provided.The
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram of an injection mold apparatus (hereinafter also simply referred to as a mold apparatus) according to the first embodiment. FIG. 2 is a schematic view of the fixed mold when the fixed-side mold dividing surface of the mold apparatus according to the first embodiment is viewed from the movable side. FIG. 3 is a schematic diagram of the core position adjusting means in the first embodiment. FIG. 4A is a cross-sectional view of the vicinity of the cavity of the mold apparatus in the first embodiment. FIG. 4 (b) is a cross-sectional view of the vicinity of the cavity of the mold apparatus after adjustment in the first embodiment. FIG. 5 is a diagram showing an output value of the displacement sensor when the rotational behavior is suppressed according to the first embodiment.
[0023]
First, the configuration of the mold apparatus according to the first embodiment will be described.
As shown in FIG. 1, the mold apparatus 1 includes a fixed mold 2 and a movable mold 3, and a fixed side mold plate 4 of the fixed mold 2 and a movable side mold plate 5 of the movable mold 3. Are respectively embedded with a fixed core 6 and a movable core 7. Further, a fixed-side mirror core 8 and a movable-side mirror core 9 are embedded in the fixed-side core 6 and the movable-side core 7, respectively, and each mirror core 8, 9 and each of the cores 6, 7 are optical elements. A cavity 35 for forming the lens is formed. The mold apparatus 1 opens and closes with the mating surface 10 of the fixed side mold plate 6 and the movable side mold plate 7 as a boundary.
[0024]
Further, as shown in FIGS. 1 and 2, the fixed-side core 6 is embedded via the fixed-side template 4 and the clearance 11. Further, as shown in FIG. 1, a clearance 14 is also provided between the sprue bush 12, the fixed side mold plate 4, and the fixed side mounting plate 13.
[0025]
Moreover, the fixed side core 6 is fixed to the fixed side mold plate 4 so as to be slidable at a plurality of locations by bolts 15 inserted from the die mating surface 10 side. The movable core 7 is fixed to the movable mold 5 at a plurality of locations by bolts 16 inserted from the bottom surface of the movable mold 5. The movable core 7 may be fixed by a bolt inserted from the movable mold plate 5 and the mold mating surface 10 side.
[0026]
The fixed-side mirror core 8 is fixed to the fixed-side core 6 by bolts 17 inserted from the bottom surface of the fixed-side core 6.
The movable mirror surface core 9 has a flange shape on the side opposite to the cavity 35 and is connected so as to be sandwiched between the protruding plates 18 and 19.
[0027]
Further, as shown in FIG. 2, the fixed-side template 4 has two locations on the fixed-side core 6 so as to face one side surface (upper surface in FIG. 2) and the side surface perpendicular to the side surface (left surface in FIG. 2). Sensor fixing portions 20 are formed one by one, and each sensor fixing portion 20 is provided with a heat-resistant non-contact type eddy current type displacement sensor 21 whose distance between the displacement detection surface 21a and the fixed core 6 is 0.1-0. It is positioned and arranged to be 5 mm. Of course, the distance of 0.1 to 0.5 mm between the displacement detection surface 21a and the fixed core 6 is within the displacement detection range of the eddy current displacement sensor 21. A plate 22 made of a material that can keep the impedance output of the eddy current displacement sensor 21 most linear is embedded in a portion of the fixed core 6 that the displacement detection surface 21a of the eddy current displacement sensor 21 faces. These eddy current displacement sensors 21 are electrically connected via an amplifier 23 to a counter 24 that performs output display.
[0028]
Further, a pressing bolt 25 (see FIG. 1) for pressing the fixed side core 6 from the side surface is embedded in the fixed side template 4 one by one on the installation surface side of the eddy current type displacement sensor 21. Yes. The pressing bolt 25 is not in contact with the side surface of the stationary core 6 during normal molding.
[0029]
Further, between the fixed side core 6 and the fixed side mold plate 4, wedge blocks 26 and 27 are embedded on the opposite side surfaces of the fixed side core 6, respectively, on the side surfaces perpendicular thereto. The wedge blocks 28 and 29 are embedded one by one. The wedge blocks 26, 27, 28, and 29 are embedded on an axis (dotted line in FIG. 2) that passes through the center of gravity J of the stationary core 6 and is parallel to the moving direction of the stationary core 6. The wedge blocks 26, 27, 28, and 29 act as core position adjusting means for moving the stationary core 6 in a direction orthogonal to the mold opening / closing direction and adjusting its position.
[0030]
Further, the length L of the wedge blocks 26, 27, 28, 29 and the fixed-side core 6 per surface is L> H / 2 with respect to the side length H of the fixed-side core 6. The lengths L of the wedge blocks 26, 27, 28, 29 may not be the same.
Further, as shown in FIG. 3, the surface roughness Ra of the tapered surface A of the wedge blocks 26, 27, 28, 29 is 0.05 to 0.2 μm. Further, the surface B facing the tapered surface A is similarly finished with a surface roughness Ra of 0.05 to 0.2 μm.
[0031]
Further, the taper angle θ of the wedge blocks 26, 27, 28, 29 is 2 °, and is arranged so as to gradually reduce the thickness from the mold mating surface 10 side. Further, the opposing surface B of the tapered surface A is formed as a vertical surface.
In addition, the angle formed by two intersecting lines obtained by the surface A of the wedge blocks 26, 27, 28, and 29 and the surface B facing the core side surface and the plane orthogonal to the mold opening / closing direction is 35 seconds or less.
[0032]
Further, as shown in FIG. 4A, the wedge blocks 26, 27, 28, and 29 are connected to the fixed-side template 4 by a bolt 31 via a coil spring 30.
In FIG. 1, 32 is a movable side mounting plate, and 33 is a locating ring for positioning with a molding machine (not shown). Reference numeral 34 denotes a spacer for securing a movable area of the protruding plates 18 and 19.
[0033]
Then, the effect | action of the structure mentioned above is demonstrated.
The relative positional relationship between the fixed-side core 6 and the movable-side core 7 embedded in the fixed-side mold plate 4 and the movable-side mold plate 5 is not limited to the fixed-side specular core 8 and the movable-side specular core 9. Due to the embedding position and processing error, at the initial stage, as shown in FIG. In this state, the mold apparatus 1 fills the cavity 35 with resin, cools and solidifies it to produce a lens component, measures in advance the eccentricity between the lens surfaces, and determines the amount of eccentricity.
[0034]
Next, the mating surfaces 10 of the fixed side mold plate 4 and the movable side mold plate 5 are separated from each other, and the bolts 15 for fixing the fixed side core 6 shown in FIG. 4 (a) are loosened. Further, the bolt 36 for fixing the sprue bushing 12 shown in FIG. Next, the bolt 31 of the wedge block 27 is loosened in advance, and the wedge block 27 is slid upward on the paper surface. When the bolt 31 of the wedge block 26 is tightened, the wedge block 26 slides downward on the paper surface. At the same time, the stationary core 6 slides leftward on the paper surface due to the action of the tapered surface A of the wedge block 26. The fixed-side mirror core 8 also slides in the same direction while being supported by the fixed-side core 6. Since the behavior of the fixed core 6 is always detected by the eddy current displacement sensor 21 shown in FIG. 2 and displayed on the counter 24 via the amplifier 23, the operator can obtain the eccentricity obtained in advance by the display value. The optimum position of the stationary core 6 can be set at the time of efficiency while confirming that the amount has changed. Furthermore, the position of the fixed side core 6 can be fixed by pressing the bolt 31 of the wedge block 27 facing the wedge block 26 and sandwiching the fixed side core 6. After the position adjustment of the fixed side core 6, the fixing bolt 15 shown in FIG. 4A is tightened to completely fix the fixed side core 6 to the fixed side template 4 and the adjustment work is completed.
[0035]
In the adjustment operation, if the wedge block 26 is moved too much and the position of the fixed side core 6 passes the optimum position, the bolt 31 of the wedge block 26 is loosened by a slight amount to remove the wedge block on the paper surface. It is possible to finely adjust the position of the fixed-side core 6 by sliding it upward and tightening the bolt 31 of the wedge block 27 to slide the fixed-side core 6 rightward on the paper surface. The position of the stationary core 6 in the direction perpendicular to the mold opening / closing direction can be adjusted with high accuracy by pushing in or loosening using the bolts 31 of the wedge blocks 26, 27, 28, 29. it can.
[0036]
In this embodiment, by setting the angle θ of the tapered surface A of the wedge blocks 26, 27, 28, 29 to 2 °, it becomes possible to slide with high resolution against the pressing and loosening of the bolt 31, High-precision position adjustment is possible. Furthermore, the fixed side core 6 slides by finishing the surface roughness Ra of the tapered surface A of the wedge blocks 26, 27, 28, 29 and the surface B facing the tapered surface A with 0.05 to 0.2 μm. Can be made smooth. Furthermore, two intersecting lines obtained by the surface A and the surface B opposite to the side surface of the stationary core 6 of the wedge blocks 26, 27, 28, and 29 and the plane orthogonal to the mold opening / closing direction. The initial inclination of the fixed core 6 embedded in the fixed mold 4 can be suppressed by setting the angle formed by In addition, the length L of the wedge block 26, 27, 28, 29 and the side surface of the stationary side core 6 that touches the surface is set to a length equal to or greater than H / 2. Sliding can be enabled.
[0037]
As an example, FIG. 5 shows the output value of the eddy current displacement sensor 21 when the lengths of the wedge blocks 26, 27, 28, 29 are set to H / 8. FIG. 5 is an output value when the stationary core 6 is moved to the maximum within the range of the clearance 11. In FIG. 5, since no opening occurs between the output values of the two eddy current displacement sensors 21 when the stationary core 6 slides, the rotational behavior is suppressed and the stationary core 6 moves in parallel. It shows a state. In FIG. 5, the upper right and upper left sensor outputs indicate the outputs of the two eddy current displacement sensors 21 disposed on the upper right and upper left of the fixed core 6 on the paper surface of FIG. ing.
[0038]
Further, when the wedge block 26, 27, 28, 29 is pressed too much, the wedge block 26, 27, 28, 29 and the stationary side core 6 are twisted to move the wedge block 26, 27, 28, 29. It may disappear. In that case, the wedge bolt 26 is pressed by strongly pressing the pressing bolt 25 that presses the side surface of the fixed-side core 6 installed on the fixed-side template 4 and moving the position of the fixed-side core 6 by a minute distance. , 27, 28, 29 and the fixed side core 6 can be made to generate a small gap so that the wedge blocks 26, 27, 28, 29 can be eliminated and slidable.
[0039]
As described above, according to the first embodiment of the present invention, even when the mold apparatus is attached to the molding machine, the operator confirms the relative positional deviation between the mold fixed side and the movable side in real time. It can be adjusted to the optimum state. In addition, the behavior of rotation and translation during sliding of the fixed side core can be confirmed by an eddy current displacement sensor, and the rotational behavior of the fixed side core is further confirmed by the mold apparatus of the first embodiment. Since it can suppress and can translate in parallel with high precision, even if it takes many pieces, a core position can be adjusted with high precision.
[0040]
Furthermore, it is possible to provide an optical element that has a small amount of decentration and excellent optical performance compared with the conventional method of correcting and reassembling a mold according to the amount of decentering of the lens.
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0041]
Regarding the second embodiment, only the parts different from the first embodiment will be described. FIG. 6 is a schematic diagram of the fixed mold when the fixed-side mold split surface of the injection mold apparatus according to the second embodiment is viewed from the movable side. FIG. 7 is a cross-sectional view of the vicinity of the cavity of the mold apparatus according to the second embodiment.
[0042]
First, the configuration of the mold apparatus according to the second embodiment will be described.
As shown in FIG. 6, two wedge blocks 42 and 43 are embedded in one side surface between the fixed side core 41 and the fixed side template 40, and the wedge blocks 42 and 43 are fixed side cores. 41 is embedded in a symmetrical position with respect to the central axis T of the side surface length H ′. Furthermore, two wedge blocks 44 and 45 are embedded on the right side surface of FIG. 6 in the direction perpendicular to this, and the wedge blocks 44 and 45 are the center of the side length H ″ of the fixed core 41. The wedge block 42, 43, 44, 45 is embedded in a symmetrical position with respect to the axis T. The core position is adjusted to adjust the position of the stationary side core 41 in the direction perpendicular to the mold opening / closing direction. In addition, the length L of the wedge block 42, 43, 44, 45 and the fixed side core 41 that touches the surface is equal to the side length H ′ or H ″ of the fixed side core 41, respectively. It is composed of 1/8 or more. The lengths L ′ of the wedge blocks 42 and 43 are equivalent, and the lengths L ″ of the wedge blocks 44 and 45 are equivalent.
[0043]
Reference numeral 50 denotes a clearance provided between the fixed core 41 and the fixed template 40.
Further, as shown in FIG. 7, reference numeral 46 denotes a pressing pin for pressing the stationary core 41 from the side surface, and a screw plug 48 is installed on the back surface via a coil spring 47. These are all embedded in a pin hole 46a and a bolt hole 48a formed from the side surface of the fixed-side template 40, and are eddy current type displacement sensors for detecting the displacement of the fixed-side core 41. 49 is installed on the center axis T of the side lengths H ′ and H ″ of the fixed side core 41 in the same direction as 49.
[0044]
The rest of the configuration is the same as in the first embodiment.
Then, the effect | action of the structure mentioned above is demonstrated.
In the example of FIG. 7, when adjusting the position of the fixed side core 41 in the direction perpendicular to the mold opening / closing direction, the fixed side core 41 slides to the left on the paper surface by pushing the wedge block 44. To do. At that time, since the urging force is always applied to the stationary core 41 in the right direction on the paper surface by the pressing pin 46 through the coil spring 47 on the back surface, if the wedge block 44 slides upward on the paper surface, The stationary core 41 returns to the right side on the paper. The fixed core 41 is always sandwiched between the wedge blocks 44 and 45 and the pressing pin 46.
[0045]
Further, when the rotation behavior and the inclination occur when the fixed-side core 41 slides, the amount of pressing of one of the wedge blocks 42 and 43 is adjusted to adjust the delicate rotation behavior. Further, since the rotational behavior or tilt behavior of the fixed core 41 is always detected by the eddy current displacement sensor 49 and displayed on the counter 73 via the amplifier 72, the operator confirms this display value. The optimum position of the stationary core 41 can be set efficiently, and more delicate rotational behavior can be monitored. Note that the rotational behavior of the stationary core 41 may be adjusted using the wedge blocks 44 and 45.
[0046]
As described above, according to the second embodiment of the present invention, the same effect as in the first embodiment can be obtained, and further, the delicate rotational behavior of the stationary core can be adjusted and suppressed. In addition, even when the wedge block cannot be provided on an axis that passes through the center of gravity of the fixed core and is parallel to the moving direction of the fixed core due to restrictions on the mold structure, the wedge block is not provided in another location. Can be buried.
[0047]
Next, Embodiment 3 of the present invention will be described with reference to FIGS.
Regarding the third embodiment, only the parts different from the first embodiment will be described. FIG. 8 is a schematic diagram of an injection molding die apparatus according to the third embodiment. FIG. 9 is a schematic view of the fixed mold when the fixed-side mold dividing surface of the mold apparatus according to the third embodiment is viewed from the movable side.
[0048]
First, the configuration of the mold apparatus according to the third embodiment will be described.
As shown in FIG. 8, a fixed side core 53 and a movable side core 54 are respectively embedded in the fixed side mold plate 51 and the movable side mold plate 52, and the fixed side core 53 has a fixed side mirror surface core. 55 is embedded, and the fixed-side mirror core 55 has a spherical shape. Further, movable side mirror cores 56 and 57 having two optical planes are embedded in the movable side core 54. The cavity 58 has a prism shape composed of one spherical surface, two optical planes, and two side surfaces. Note that the mold apparatus opens and closes at a boundary surface 59 between the fixed side mold plate 51 and the movable side mold plate 52.
[0049]
Further, the cavity 58 is provided with an overflow portion 60 for performing protrusion, and the molded products are released from the movable side mirror cores 56 and 57 by the protrusion pins 61 and 62.
Further, the fixed-side mirror core 55 is fixed from the bottom surface of the fixed-side core 53 by bolts 63. Similarly, the movable side specular cores 56 and 57 are also fixed by bolts 64 and 65 from the bottom surface of the movable side template 52. The protrusion pins 61 and 62 are connected to the protrusion plates 66 and 67.
[0050]
The rest of the configuration is the same as in the first embodiment.
The fixed-side specular core 55 shown in the third embodiment is not limited to a spherical shape, and may be an aspherical shape, a cylindrical shape, or a free-form surface shape. Furthermore, the movable side mirror cores 56 and 57 are not limited to the optical plane, and may be spherical and aspherical, cylindrical or free curved.
[0051]
Then, the effect | action of the structure mentioned above is demonstrated.
Even in prism products, eccentricity occurs between the surfaces. In this case, since the desired performance cannot be satisfied, the wedge block 68, 69, 70, 71 is used to correct this deviation amount by the same operation as that of the first embodiment of the invention as shown in FIG. Use to adjust.
[0052]
As described above, according to the third embodiment of the present invention, the same effects as those of the first embodiment can be obtained, and further, the optical axis position can be adjusted in a deformed optical element having a high decentering accuracy such as a prism shape. Become.
In the first and third embodiments described above, the wedge block can be simply arranged in the vicinity of the center with respect to the longitudinal direction of the side surface of the stationary core.
[0053]
In the first to third embodiments described above, the shape of the fixed side core and the movable side core is preferably a rectangular parallelepiped or a rectangular parallelepiped, but may be a cylindrical body.
In the first to third embodiments described above, the eddy current displacement sensor is at least the fixed-side core for detecting the relative position of the fixed-side core with respect to the fixed-side mold plate in two directions. One or more at the position facing one side and one or more at the position facing the side of the fixed core perpendicular to the one side, or in addition, rotation of the fixed core In order to accurately grasp the behavior, at least two are provided at a position facing one side of the fixed core and one or more are provided at a position facing the side of the fixed core perpendicular to the one side. It should be.
[0054]
In the first to third embodiments described above, instead of the eddy current displacement sensor, other displacement sensors such as a contact type linear gauge can be applied as long as they are heat resistant.
In the first to third embodiments, the stationary core is pressed by another member, such as a screw, that can be mechanically adjusted instead of the wedge block. It is also possible.
[0055]
In the first and third embodiments described above, the length of the surface contact portion between the wedge block and the fixed core may be at least 1/8 or more of the length of the fixed core side surface.
In the first to third embodiments described above, the surface roughness Ra of the tapered surface A and the tapered surface B of the wedge block may be at least 1.6 μm or less.
[0056]
In the first to third embodiments described above, the taper angle θ of the wedge block may be at least 0.5 ° and less than 5 °.
Moreover, in Embodiment 1 thru | or 3 mentioned above, it obtains from the side surface which carries out surface contact with the fixed side core, the side surface which carries out surface contact with the fixed side mold plate, and the plane orthogonal to the mold opening and closing direction The angle formed by the two intersecting lines may be at least 5 minutes or less.
[0057]
In the first to third embodiments described above, it is possible to use the movable core as the core whose position is to be adjusted, and adjust the position of the movable core in the same manner. Alternatively, the core whose position is to be adjusted is set as both the fixed core and the movable core, and the positions of both the fixed core and the movable core are adjusted in the same manner. Is also possible.
[0058]
As mentioned above, although the metal mold | die apparatus of this invention was demonstrated in detail, this invention is not limited to the said embodiment, Of course, in the range which does not deviate from the summary of this invention, various improvement and a change may be performed. It is.
[0059]
【The invention's effect】
As described above in detail, according to the mold apparatus according to the present invention, the position of the core embedded in the fixed side and the movable side is detected in real time by the displacement sensor, and the operator responds to the detected value. Thus, the core position can be adjusted with the mold attached to the molding machine, and the core position can be adjusted to an optimum state.
[0060]
In addition, the rotational behavior when the core slides can be confirmed by a displacement sensor, and the occurrence of rotational behavior can be suppressed when the core slides. At the same time, the optical axis position can be adjusted.
Furthermore, by using the mold apparatus according to the present invention, it is possible to provide an optical element excellent in optical performance with extremely good decentering accuracy.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an injection molding die apparatus according to a first embodiment.
FIG. 2 is a schematic diagram of a fixed mold when a fixed-side mold split surface of the injection mold apparatus according to the first embodiment is viewed from a movable side.
FIG. 3 is a schematic diagram of core position adjusting means in the first embodiment.
4A is a cross-sectional view of the vicinity of the cavity of the injection mold apparatus according to the first embodiment, and FIG. 4B is a cross-sectional view of the vicinity of the cavity of the injection mold apparatus after adjustment according to the first embodiment. It is.
5 is a diagram showing a displacement sensor output value when rotational behavior is suppressed according to Embodiment 1. FIG.
FIG. 6 is a schematic diagram of a fixed mold when a fixed-side mold split surface of the injection-molding mold apparatus according to the second embodiment is viewed from the movable side.
FIG. 7 is a cross-sectional view of the vicinity of a cavity of an injection molding die apparatus according to a second embodiment.
FIG. 8 is a schematic diagram of an injection molding die device according to a third embodiment.
FIG. 9 is a schematic diagram of a fixed mold when a fixed-side mold split surface of the injection-molding mold apparatus according to Embodiment 3 is viewed from the movable side.
[Explanation of symbols]
1 Mold device
2 Fixed mold
3 Movable mold
4 Fixed side template
5 Movable side template
6 Fixed core
7 Movable side core
8 Fixed side mirror core
9 Movable mirror core
10 mating surface
11 Clearance
12 Sprue bushing
13 Fixed mounting plate
14 Clearance
16, 17 bolts
18, 19 Extrusion board
20 Sensor fixing part
21 Eddy current displacement sensor
22 plates
23 Amplifier
24 counter
25 Press bolt
26, 27, 28, 29 wedge block
30 Coil spring
31 volts
32 Movable side mounting plate
33 Locate Ring
34 Spacer
35 cavities
36 volts
40 Fixed side template
41 Fixed core
42, 43, 44, 45 wedge block
46 Pressing pin
46a pin hole
47 Coil spring
48 Screw plug
48a Bolt hole
49 Eddy current displacement sensor
51 Fixed side template
52 Movable side template
53 Fixed core
54 Movable core
55 Fixed Mirror Core
56, 57 Movable mirror core
58 cavity
59 mating surface
60 Overflow part
61, 62 Extrusion pin
63 volts
64, 65 volts
66, 67 Extrusion board
68, 69, 70, 71 wedge block
72 amplifiers
73 counter

Claims (2)

In a mold apparatus for molding an optical element having a plurality of optical surfaces,
A fixed side template,
A movable side template,
A core embedded in each of the mold plates and at least one of which has a clearance between the mold plates;
A displacement sensor for detecting a relative position of at least one of the cores to the template;
A core position adjusting means capable of moving the core in a direction perpendicular to the mold opening and closing direction;
Have
The core position adjusting means is disposed on an axis passing through the center of gravity of the core and parallel to the moving direction of the core ,
The length of the surface contact portion between the core position adjusting means and the core is 1/8 or more of the length of the side surface of the core that provides the core position adjusting means,
The core position adjusting means is a block member having a wedge shape,
Both the surface roughness Ra of the surface contact portion between the block member and the core and the surface contact portion between the block member and the template of the block member are 1.6 μm or less,
The taper angle of the wedge-shaped block member is 0.5 ° or more and less than 5 °,
The displacement sensor is provided with two or more facing the side surface of the core, and one or more facing the side surface of the core perpendicular to the side surface,
The displacement sensor is an eddy current displacement sensor .
A mold apparatus characterized by that. In a mold apparatus for molding an optical element having a plurality of optical surfaces,
A fixed side template,
A movable side template,
A core embedded in each of the mold plates and at least one of which has a clearance between the mold plates;
A displacement sensor for detecting a relative position of at least one of the cores to the template;
A core position adjusting means capable of moving the core in a direction perpendicular to the mold opening and closing direction;
Have
A plurality of the core position adjusting means are disposed substantially symmetrically with respect to the center in the longitudinal direction of the core side surface on which the core position adjusting means is provided ,
The length of the surface contact portion between the core position adjusting means and the core is 1/8 or more of the length of the side surface of the core that provides the core position adjusting means,
The core position adjusting means is a block member having a wedge shape,
Both the surface roughness Ra of the surface contact portion between the block member and the core and the surface contact portion between the block member and the template of the block member are 1.6 μm or less,
The taper angle of the wedge-shaped block member is 0.5 ° or more and less than 5 °,
The displacement sensor is provided with two or more facing the side surface of the core, and one or more facing the side surface of the core perpendicular to the side surface,
The displacement sensor is an eddy current displacement sensor .
A mold apparatus characterized by that.

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