JP2007153669A - Centering device for molding die of glass optical element, and centering method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centering technique for the molding die of a glass optical element capable of achieving high accuracy molding process when molding the optical element by pressing a thermally softened glass material using the first and second dies facing each other. <P>SOLUTION: The device for achieving the centering technique is provided, as means, with: a first die 50 having a first curved molding face 52 for molding the first surface of the glass optical element; a second die 60 having a second curved molding face 62 for molding the second surface thereof; a levelness detection mechanism 20 for outputting the first and second beams (B1) and (B2) which make their optical axes coincide with each other to go straight to the direction reverse to each other; a first fixed base 30 for fixing the first die 50; a second fixed base 40 for fixing the second die 60; a first position-adjustment mechanism 80a for adjusting the horizontal position of the first die 50; and a second position-adjustment mechanism 80b for doing the same adjustment as above with respect to the second die 60. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of molding a glass optical element by pressing a heat-softened glass material by a mold divided into a first mold (lower mold) and a second mold (upper mold) facing each other. In particular, the present invention relates to a centering technique for a mold of a glass optical element that realizes high-precision molding.

In recent years, as a high-performance glass optical element is developed, a highly accurate molding process is required, and research on a molding technique for achieving this requirement is in progress. In particular, when molding a glass optical element, a technique for centering a mold (first mold, second mold) that repeats the mold closed state / mold opened state with high accuracy is an important molding technique. one of.
Here, “centering” means that the first mold that molds the first surface of the glass optical element and the second mold that molds the second surface of the glass optical element are in a closed state, and their rotational symmetry axes coincide with each other. .

As a conventional technique for executing such centering with high accuracy, a technique as shown in FIG. 7 is disclosed.
That is, the upper mold 1 and the lower mold 2 are configured to press the glass material when the glass material (not shown) heated and softened in the mold open state is sandwiched between the upper mold 1 and the lower mold 2. . The movable shaft 3 holds the lower mold 2 and is movable up and down to repeat mold closing / mold opening. Here, the upper mold 1 is provided with a symmetrical adjustment curved surface 1b on the surface opposite to the molding curved surface 1a for molding the first surface of the glass optical element. Then, the upper die 1 and the lower die 2 are centered by detecting the reflected light reflected from the adjustment curved surface 1b and the shaping curved surface 2a by the beam output from the levelness detector 4 disposed above. .
JP-A-8-91855 (paragraph 0011, FIG. 1)

  By the way, the above-described prior art requires special processing such as the adjustment curved surface 1b on the surface opposite to the molding curved surface 1a of the upper mold 1 in order to perform centering adjustment. For this reason, the accuracy of centering achieved greatly depends on the processing accuracy of the adjustment curved surface 1b. In addition, the upper die 1 requiring such special processing is inevitably expensive. For this reason, in view of the fact that the mold is a consumable item, employing a centering technique such as the prior art is a problem because it greatly increases the production cost of the glass optical element.

  The present invention was devised with the object of solving such problems, and enables centering without special processing on the mold, and molds a highly accurate and inexpensive glass optical element. A glass optical element molding die centering apparatus and a centering method therefor are provided.

  In order to solve the above-described problems, the present invention provides a glass optical element molding die centering device that is molded by pressing a heat-softened glass material, and first molding that molds the first surface of the glass optical element. A first mold having a curved surface and a first reference surface orthogonal to a first axis of symmetry that is rotationally symmetric to the first molded curved surface; a second molded curved surface that molds the second surface of the glass optical element; and A second mold having a second reference surface orthogonal to a second symmetry axis that is rotationally symmetric with respect to the forming curved surface, and a levelness detection mechanism that outputs a first beam and a second beam that coincide with the optical axis and go straight in opposite directions. A first fixed base for fixing the first mold by bringing the first reference surface into contact with a first fixed surface on which the first beam is vertically incident; and a second fixed surface on which the second beam is vertically incident. The second reference surface is brought into contact with the second mold to fix the second mold. And a first position adjusting mechanism for adjusting a horizontal position on the first fixed surface of the first mold so that reflected light from the first shaping curved surface of the first beam coincides with the optical axis. A second position adjusting mechanism for adjusting a horizontal position on the second fixed surface of the second mold so that the reflected light of the second beam from the second shaping curved surface coincides with the optical axis; It is characterized by providing as.

  By constructing the invention from such means, the first type of first symmetry axis can be made coincident with the optical axis of the first beam, and similarly, the second type of second symmetry axis can be made to coincide with the second beam. It can be made to coincide with the optical axis. As a result, since the optical axis of the first beam and the optical axis of the second beam coincide with each other, the first symmetry axis and the second symmetry axis coincide with each other. Adjustment of centering will be executed.

  According to the present invention, a glass optical element molding die centering apparatus capable of molding a glass optical element with high accuracy and low cost, which can be centered without performing special processing on the molding die, and the centering thereof. A method is provided.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the glass optical element molding die centering device 10 of the present embodiment includes a levelness detection mechanism 20, a molding die 70, a first position adjustment mechanism 80 a, and a second position adjustment mechanism 80 b. The casing 90, the first inclination adjusting mechanism 91a, the second inclination adjusting mechanism 91b, and the pressing mechanism 92 are the main components.

  As shown in FIG. 2A, the levelness detection mechanism 20 includes at least a first levelness detector 20a, a second levelness detector 20b, and a reflection plate 27 as components. With this configuration, the horizontality detection mechanism 20 outputs the first beam B1 and the second beam B2 that coincide with the optical axis and go straight in opposite directions.

  As shown in FIG. 2B, the first horizontality detector 20a and the second horizontality detector 20b (autocollimator) include a beam light source 21, lenses 22, 24, a half mirror 23, and a position sensor. 25. The thus configured horizontality detectors 20a and 20b detect the reflected light of the beam B1 (B2) from the surface of the object 32 and determine whether or not the incident angle of the beam B1 (B2) is vertical. Judgment. As shown in FIG. 1, the first horizontality detector 20a and the second horizontality detector 20b are fixed to the housing 90 via the first pedestal 26a and the second pedestal 26b, respectively.

  The first pedestal 26a and the second pedestal 26b are used to tilt the first horizontality detector 20a and the second horizontality detector 20b in order to change the optical axes of the output first beam B1 and second beam B2. And adjust the position. The first base 26a and the second base 26b are adjusted so that at least the optical axes of the first beam B1 and the second beam B2 coincide. Further, the first pedestal 26a and the second pedestal 26b are adjusted so that the vectors of the optical axes of the beams B1 and B2 that go straight in the vertical direction in FIG. 1 coincide with the vector of the reciprocating motion of the pressing mechanism 92 described later. Is done.

Returning to FIG. 2B, the description will be continued.
The beam B1 (B2) output from the beam light source 21 passes straight through the lens 22, the half mirror 23, and the lens 24 and enters the surface of the object 32. The incident beam B is reflected by the surface of the object 32, travels straight in the opposite direction, passes through the lens 24, and is reflected by the half mirror 23. The beam B1 (B2) reflected by the half mirror 23 enters the position sensor 25. Here, the position sensor 25 can specify the position where the beam B1 (B2) is incident on the secondary plane, for example, like a CCD camera. The lenses 22 and 24 are moved and adjusted (collimated) as appropriate so that the beam B1 (B2) becomes parallel light without diffusion / convergence.

Here, FIG. 2C shows a screen 25a of a monitor (not shown). This screen 25a is formed by focusing the position and cross section of the beam B1 (B2) incident on the position sensor 25 on the secondary plane as a spot S. Here, when the position of the spot S coincides with the center position 25b, that is, since the beam B1 (B2) is perpendicularly incident on the surface of the object 32, the reflected light coincides with the optical axis of the incident light. Show.
In this way, by confirming the position of the screen 25a of the spot S, it can be determined whether or not the beam B1 (B2) is incident on the object 32 vertically. Further, if the inclination of the object 32 can be adjusted so that the spot S is located at the center position 25b, the beam B1 (B2) can be vertically incident on this surface.

  As shown in FIG. 2A, the reflecting plate 27 is orthogonal to the traveling directions of the first beam B1 and the second beam B2 output from the first horizontality detector 20a and the second horizontality detector 20b, respectively. It will change direction. Here, since the first beam B1 and the second beam B2 incident on the reflection plate 27 have the same optical axis, the first beam B1 and the second beam B2 reflected in the orthogonal direction also have the optical axes. Match.

  As shown in FIG. 2D, the reflecting plate 27 is fixed so that the incident angle λ is π / 4 (rad) with respect to the incident beam B1 (B2). Here, the incident angle λ is a line when an intersection point of the optical axis and the reflection plate 27 is a point Q, a perpendicular line is dropped on the reflection plate 27 from an arbitrary point P on the optical axis, and the foot is a point H. An angle formed by the segment PQ and the line segment QH. If the incident angle λ is π / 4 (rad) as described above, the reflection angle is naturally π / 4 (rad), so that the traveling direction of the beam B1 (B2) is orthogonal to the reflecting plate 27. It will be converted to.

As shown in FIG. 1, the reflector 27 is disposed between a lower mold (first mold) 50 and an upper mold (second mold) 60 described later. Although not particularly illustrated, the case 90, the first fixing base 30 or the second fixing base 40 is fixed as a reference. Alternatively, as shown in FIG. 2A, the reflection 27 may be configured to be integrated with the first horizontality detector 20a and the second horizontality detector 20b by the support 28.
Further, in the embodiment shown in FIG. 1, the levelness detection mechanism 20 is configured by two levelness detectors 20 a and 20 b and a reflection plate 27 arranged in the horizontal direction. It is not limited to such a form. In other words, the horizontality detection mechanism 20 has a function of outputting the first beam B1 and the second beam B2 that match the optical axes and go straight in opposite directions to detect reflected light that matches the optical axis. If there is, it can be applied as appropriate.

  As shown in FIG. 3A, the molding die 70 includes a lower die (first die) 50 and an upper die (second die) 60. FIG. 3A shows the “mold closed state” of the mold 70, and the cavity 71 has the same shape as the glass optical element 72 shown in FIG. Then, after either one of the lower mold 50 or the upper mold 60 is released from the “mold closed state” to be a “mold open state”, a heat-softened glass material (not shown) is disposed on the lower mold 50, When the mold is returned to the “closed state”, the glass material is pressed and deformed, and the glass optical element 72 is molded. Further, the glass optical element 72 is mass-produced by repeating the operations of “mold open state” → “arrangement of glass material” → “mold closed state” → “removal of molded product”.

  The lower mold (first mold) 50 includes a first reference curved surface 52 that molds the first surface 72a of the glass optical element 72, and a first reference orthogonal to a first symmetry axis 54 that is rotationally symmetric with respect to the first molding curved surface 52. A surface 53 is provided. With this configuration, the lower mold 50 is configured by a rotationally symmetric body having the first symmetric axis 54 as a rotation center (see FIG. 3C), and the first die 50 is intersected with the first symmetric axis 54. The first tangential plane 55 in contact with the molding curved surface 52 is configured in parallel with the first reference plane 53. For this reason, the reflected light of the first beam B1 incident on the first shaping curved surface 52 and the surface (the first fixed surface 31 (see FIG. 1)) in contact with the first reference surface 53 coincides with the optical axis of the incident light. In this case, it can be said that this optical axis also coincides with the first symmetry axis 54.

  The lower mold (first mold) 50 is fixed such that the first reference surface 53 is in contact with the first fixing surface 31 of the first fixing base 30 (see FIG. 1). For this reason, the first fixed surface 31 shares the same plane as the first reference surface 53, and is smoothly finished to such an extent that the incident beam B1 (B2) is not irregularly reflected.

Returning to FIG. 3A, the description will be continued.
The upper mold (second mold) 60 includes a second molding curved surface 62 that molds the second surface 72b of the glass optical element 72, and a second reference orthogonal to a second symmetry axis 64 that is rotationally symmetric with respect to the second molding curved surface 62. A surface 63 is provided. With this configuration, the upper mold 60 is configured by a rotationally symmetric body having the second symmetric axis 64 as a rotation center (see FIG. 3C), and the second die 60 is intersected with the second symmetric axis 64 at the second point. The second tangent plane 65 in contact with the forming curved surface 62 is configured in parallel with the second reference plane 63. For this reason, the reflected light of the second beam B2 incident on the second shaping curved surface 62 and the surface (the second fixed surface 41 (see FIG. 1)) in contact with the second reference surface 63 coincides with the optical axis of the incident light. In this case, it can be said that this optical axis also coincides with the second symmetry axis 64.

  By the way, the rotationally symmetric body referred to in the present invention is not limited to that shown in FIG. 3 (c), and is not limited to one in which the cross section perpendicular to the axis of symmetry 54 is shown as a perfect circle. Some cases are also included. Accordingly, the glass optical element 72 to which the present invention can be applied includes an optical element having different curvatures in the orthogonal direction, such as a toric lens.

Returning to FIG. 3A, the description will be continued.
In the molding die 70 configured in this way, the reflected light of the first beam B1 on the first molding curved surface 52 and the first fixed surface 31 coincides with the incident light, that is, the spot S shown in FIG. The position of the lower mold 50 is adjusted so that is positioned at the center position 25b. Then, the reflected light of the second beam B2 on the second shaping curved surface 62 and the second fixed surface 41 is coincident with the incident light, that is, the spot S shown in FIG. 2C is at the center position 25b. The position of the upper mold 60 is adjusted. In this way, the positions of the lower mold 50 and the upper mold 60 are adjusted, and the centering of the mold 70 is executed.

  As shown in FIG. 4, the position adjustment mechanism 80 (first position adjustment mechanism 80 a, second position adjustment mechanism 80 b) includes a fastening member 81, a position determination member 82, and a biasing member 83. It is. With reference to FIG. 1, the first position adjusting mechanism 80a configured as described above is configured so that the reflected light of the first beam B1 incident on the first shaping curved surface 52 is detected by the first levelness detector 20a. The horizontal position on the first fixed surface 31 of the lower mold 50 is adjusted. Then, the second position adjusting mechanism 80b is arranged on the second fixed surface 41 of the upper mold 60 so that the reflected light of the second beam B2 incident on the second shaping curved surface 62 is detected by the second levelness detector 20b. Adjusts the horizontal position.

As shown in FIG. 1, the fastening member 81 is for fixing the upper mold (second mold) 60 through the second fixing base 40 through the second fixing hole 61 (see FIG. 3A). As a result, the upper mold (second mold) 60 is supported with high rigidity with respect to the housing 90 via other members (not shown).
Similarly, the fastening member 81 is for fixing the lower die (first die) 50 through the first fixing base 30 through the first fixing holes 51 (see FIG. 3A). Accordingly, the lower mold (first mold) 50 is supported with high rigidity with respect to the housing 90 via the pressing mechanism 92 and the like.

The description will be continued with reference to FIG.
The position determining member 82 includes a push screw 82a and a base 82b. The position determining member 82 configured in this way moves forward and backward in the longitudinal direction in accordance with the amount of rotation of the push screw 82a. And the position determination member 82 is located in two places with the longitudinal direction turned to the direction orthogonal to each other. As a result, when the push screw 82a is rotated, the tip thereof comes into contact with the side surface of the upper mold 60 or the lower mold 50, and these positions are shifted.

The urging member 83 includes a push pin 83a, a base 83b, and an elastic spring 83c. The urging member 83 configured in this way urges the elastic force in the direction in which the elastic spring 83c extends, with the tip of the push pin 83a coming into contact with the side surface of the upper die 60 or the lower die 50.
Then, the pair of the position determining member 82 and the biasing member 83 that face each other and cooperate with each other are arranged at two positions in the orthogonal direction, so that the upper mold 60 is arranged in an arbitrary direction in the plane shown in FIG. Alternatively, the lower mold 50 can be moved. Thereby, it is possible to adjust so that the upper die 60 and the lower die 50 are centered by appropriately rotating the two push screws 82a.
When these adjustments are made, the fastening member 81 is loosened, and when the position of the upper die 60 or the lower die 50 is determined, the fastening member 81 is fastened and fixed.

Returning to FIG. 1, the description will be continued.
The first tilt adjustment mechanism 91 a functions to adjust the tilt of the first fixed base 30 so that the first beam B1 is incident on the first fixed surface 31 perpendicularly. Although a detailed description of the configuration of the first inclination adjusting mechanism 91a is omitted, a configuration in which a wedge is advanced and retracted from an orthogonal direction between two stacked plate members and the amount of movement of the wedge is appropriately adjusted. The inclination of the first fixed surface 31 can be adjusted by taking Moreover, the same function can be exhibited by the first tilt adjusting mechanism 91a configured to dispose the first fixed base 30 on the biaxial rotating mechanism. Further, a similar function can be achieved by providing a leg (not shown) that supports the first fixing base on a table 92a (described later) at three points and extending and contracting the length of the leg.

  The second tilt adjustment mechanism 91b adjusts the tilt of the second fixed base 40 so that the second beam B2 is incident on the second fixed surface 41 perpendicularly. Since the configuration of the second tilt adjusting mechanism 91b is the same as that of the first tilt adjusting mechanism 91a, the description thereof is omitted.

The pressing mechanism 92 includes a table 92a, a guide 92b, and a pressurizing unit 92c. The pressing mechanism 92 configured in this manner opens and closes the molding die 70 and also deforms the heat-softened glass material disposed in the cavity 71 to form the glass optical element 72. Is given.
The table 92a reciprocates without shaking in a certain direction (vertical direction in FIG. 1). The upper end point of the reciprocating motion is determined at a position where the mold 70 is in the mold closed state, and the lower end point of the reciprocating motion is determined at a position where the mold 70 is in the open state.
The guide 92b is integrated with the housing 90 to form a rigid body, and guides the table 92a to define a reciprocating motion vector so that no shaking occurs.
The pressurizing part 92 c gives a stroke of reciprocating motion and a load necessary for molding the glass optical element 72. Specifically, a hydraulic system or a system that converts the rotational motion of the motor into a linear motion is employed.
In the present embodiment, the pressing mechanism 92 is configured to move the lower mold 50, but may be configured to move the upper mold 60.

(About centering method)
With reference to FIG. 5 (refer to other drawings as appropriate), a first embodiment of a method for centering a mold of a glass optical element of the present invention will be described.
First, as shown in FIG. 5A, the first beam B1 output from the first levelness detector 20a and the second beam B2 output from the second levelness detector 20b are parallel to each other. In addition, the first fixed surface 31 is set so as to go straight in parallel. That is, the setting jig 28 erected vertically to the first fixed surface 31 is detachably disposed. Then, the inclinations (θy, θz) of the first horizontality detector 20a and the second horizontality detector 20b are adjusted so that the first beam B1 and the second beam B2 are vertically reflected on both surfaces of the setting jig 28. . Specifically, the first pedestal 26a and the second pedestal 26b (see FIG. 1) are adjusted so that the spot S shown in FIG. 2B is at the center position 25b.

  Next, as shown in FIG. 5B, the setting jig 28 is removed, and at least one of the first horizontality detector 20a and the second horizontality detector 20b is moved in the yz plane. The optical axes of the first beam B1 and the second beam B2 are matched. Specifically, by adjusting the first pedestal 26a and the second pedestal 26b (see FIG. 1), the second beam B2 is the first horizontal so that the first beam B1 is incident on the second levelness detector 20b. It is made to enter into the degree detector 20a.

  Next, as shown in FIG. 5C, the reflecting plate 27 is arranged so that the optical axes of the beams B1 (B2) intersect at π / 4 (rad). As a result, the first beam B1 and the second beam B2 are reflected by the reflecting plate 27 and the traveling direction is changed to the orthogonal direction, and the optical axes coincide with each other in the opposite directions and go straight. By the way, as a specific method of arranging the reflector 27 as described above, the positional relationship between the first levelness detector 20a and the first fixed surface 31 has already been adjusted by the setting jig 28. The first beam B1 reflected by the first fixed surface 31 may be detected by the first levelness detector 20a. Then, the inclination (φx, φy) of the second fixing base 40 is adjusted so that the second beam B2 reflected by the second fixing surface 41 is detected by the second horizontality detector 20b. Specifically, the second tilt adjusting mechanism 91b (see FIG. 1) is operated so that the spot S shown in FIG. 2 (b) comes to the center position 25b. As described above, the step of causing the first beam B1 and the second beam B2 to enter the first fixed surface 31 and the second fixed surface 41 perpendicularly is achieved.

Next, as shown in FIG. 5D, the lower mold 50 is disposed on the first fixed surface 31, and the reflected light of the first beam B1 incident on the first shaping curved surface 52 coincides with the optical axis of the incident light. The horizontal position (x, y) of the lower mold 50 is adjusted as follows. Furthermore, the upper mold 60 is arranged on the second fixed surface 41, and the horizontal position (x, x, b) of the upper mold 60 is set so that the reflected light of the second beam B2 incident on the second shaping curved surface 62 coincides with the optical axis of the incident light. Adjust y).
Specifically, the two push screws 82a and 82a of the first and second position adjusting mechanisms 80a and 80b shown in FIG. 4 are rotated, and the first and second horizontality detectors 20a and 20b shown in FIG. The spot S shown in b) is positioned at the center position 25b.
The centering of the lower mold 50 and the upper mold 60 is completed by the above process.

Next, with reference to FIG. 6 (refer also to other drawings as appropriate), a second embodiment of the method for centering the mold of the glass optical element of the present invention will be described.
First, as shown in FIG. 6A, the horizontality detection mechanism 20 includes a first horizontality detector 20a, a second horizontality detector 20b, and a reflection plate 27, which are constituent elements. Are adjusted in advance so as to output the first beam B1 and the second beam B2 that travel in the opposite directions.

  Next, as shown in FIG. 6 (b), the inclination (φx,...) Of the first fixed base 30 so that the first beam B1 reflected by the first fixed surface 31 is detected by the first levelness detector 20a. φy) is adjusted. Then, the inclination (φx, φy) of the second fixing base 40 is adjusted so that the second beam B2 reflected by the second fixing surface 41 is detected by the second horizontality detector 20b. More specifically, when the first and second tilt adjustment mechanisms 91a and 91b (see FIG. 1) are operated, the spot S shown in FIG. 2B of the first and second horizontality detectors 20a and 20b is generated. It should come to the center position 25b. As described above, the step of causing the first beam B1 and the second beam B2 to enter the first fixed surface 31 and the second fixed surface 41 perpendicularly is achieved.

  Next, as shown in FIG. 6C, the lower die 50 and the upper die 60 are arranged, and the horizontal position on the xy plane is adjusted to perform centering. Since it is the same process as d), description is abbreviate | omitted.

  The centering method described above uses computer control based on a program, and based on the position detection data of the spot S of the reflected light spot S of the beams B1 and B2 by the autocollimators 20a and 20b, the tilt adjusting mechanisms 91a and 91b and the position It is also possible to realize the adjustment of the adjusting mechanisms 80a and 80b by automating.

It is a front view of the centering apparatus of the shaping | molding die of the glass optical element which concerns on embodiment of this invention. (A) is a front view which shows an example of the levelness detector which is a component of this invention, (b) is a monitor screen which shows the detection result of this levelness detector. (A) is sectional drawing which shows a mold closed state by an example of the 1st type | mold and 2nd type | mold which are the components of this invention, (b) is sectional drawing which shows a glass optical element, (c) is a 1st figure. It is a perspective view which shows either one type or a 2nd type | mold. (A) is a longitudinal cross-sectional view of the position adjustment mechanism which is a component of this invention, (b) is a top view. (A)-(d) is drawing explaining the centering method of the shaping | molding die of the glass optical element which concerns on 1st Embodiment of this invention. (A)-(c) is drawing explaining the centering method of the shaping | molding die of the glass optical element which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the centering mechanism of the shaping | molding die shown as a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass optical element shaping | molding centering apparatus 20 Horizontalness detection mechanism 20a 1st horizontality detector (autocollimator)
20b Second horizontality detector (autocollimator)
26a First pedestal (pedestal)
26b Second pedestal (pedestal)
27 Reflecting plate 28 Setting jig 30 First fixing base 31 First fixing surface 40 Second fixing base 41 Second fixing surface 42 Beam passage hole 43 Planar plate 50 Lower mold (first mold)
52 First Molding Curved Surface 53 First Reference Surface 54 First Symmetry Axis 60 Upper Mold (Second Mold)
62 Second molding curved surface 63 Second reference surface 64 Second symmetry axis 70 Mold 72 Glass optical element 72a First surface 72b Second surface 80a First position adjustment mechanism 80b Second position adjustment mechanism 91a First inclination adjustment mechanism 91b First 2 tilt adjustment mechanism 92 pressing mechanism B1 first beam B2 second beam

Claims (11)

In the centering device for the mold of the glass optical element that is molded by pressing the heat-softened glass material,
A first mold having a first molding curved surface that molds the first surface of the glass optical element, and a first reference surface that is orthogonal to a first symmetry axis that is rotationally symmetric to the first molding curved surface;
A second mold having a second molding curved surface that molds the second surface of the glass optical element, and a second reference surface orthogonal to a second symmetry axis that is rotationally symmetric to the second molding curved surface;
A horizontality detection mechanism that outputs a first beam and a second beam that coincide in the optical axis and go straight in opposite directions;
A first fixing base for fixing the first mold by bringing the first reference surface into contact with a first fixing surface on which the first beam is vertically incident;
A second fixing base for fixing the second mold by bringing the second reference surface into contact with a second fixing surface on which the second beam is vertically incident;
A first position adjusting mechanism for adjusting a horizontal position on the first fixed surface of the first mold so that reflected light from the first shaping curved surface of the first beam coincides with the optical axis;
A second position adjusting mechanism for adjusting a horizontal position on the second fixed surface of the second mold so that reflected light from the second shaping curved surface of the second beam coincides with the optical axis. A glass optical element molding die centering device. The horizontality detection mechanism is
A first horizontality detector for outputting the first beam and detecting reflected light when the first beam is incident on the object vertically;
A second horizontality detector for outputting the second beam and detecting reflected light when the second beam is incident on the object perpendicularly;
The glass optical element molding die centering device according to claim 1, further comprising: a reflector that changes a traveling direction of the first beam and the second beam to an orthogonal direction.   Standing vertically on the first fixed surface and setting the first beam output from the first levelness detector and the second beam output from the second levelness detector to be reflected on both sides 3. The glass optical element molding die centering device according to claim 2, wherein the jig is detachably disposed.   The first horizontality detector and / or the second horizontality detector are supported by a pedestal that is adjusted so that the optical axes of the first beam and the second beam to be output coincide with each other. The centering device of the shaping | molding die of the glass optical element of Claim 2 or Claim 3.   5. The apparatus according to claim 1, further comprising a first tilt adjustment mechanism that adjusts a tilt of the first fixed base so that the first beam is incident on the first fixed surface perpendicularly. The centering device of the shaping | molding die of the glass optical element of description.   6. The device according to claim 1, further comprising a second tilt adjusting mechanism that adjusts a tilt of the second fixing base so that the second beam is perpendicularly incident on the second fixing surface. The centering device of the shaping | molding die of the glass optical element of description.   The first position adjusting mechanism and / or the second position adjusting mechanism includes a position determining member that positions the first mold and / or the second mold from the side, and a biasing member that biases an elastic force. The glass optical element molding die centering device according to any one of claims 1 to 6, wherein the glass optical element molding die centering apparatus is a structure including the glass optical element. In the centering method of the mold of the glass optical element that is molded by pressing the heat-softened glass material,
Causing the first beam and the second beam, which coincide with the optical axes and go straight in opposite directions, to enter the first fixed surface and the second fixed surface perpendicularly;
A first mold having a first molding curved surface that molds the first surface of the glass optical element and a first reference surface orthogonal to a first symmetry axis that is rotationally symmetric with respect to the first molding curved surface is disposed on the first fixed surface. And a process of
Adjusting a horizontal position on the first fixed surface of the first mold so that reflected light of the first beam incident on the first shaping curved surface coincides with the optical axis;
A second mold having a second molding curved surface that molds the second surface of the glass optical element and a second reference surface orthogonal to a second symmetry axis that is rotationally symmetric to the second molding curved surface is disposed on the second fixed surface. And a process of
Adjusting the horizontal position on the second fixed surface of the second mold so that the reflected light of the second beam incident on the second shaping curved surface coincides with the optical axis. A method for centering a mold of a glass optical element.   9. The method for centering a molding die for a glass optical element according to claim 8, wherein the traveling directions of the first beam and the second beam are changed to orthogonal directions by a reflecting plate.   The glass optical element forming die centering according to claim 9, further comprising a step of aligning the optical axes of the first beam and the second beam by using a setting jig standing on the first fixed surface. Method.   Adjusting the inclination of at least one of the first fixed surface, the second fixed surface, and the optical axis so that the first beam and the second beam are perpendicularly incident on the first fixed surface and the second fixed surface; The method for centering a molding die for a glass optical element according to any one of claims 8 to 10, further comprising:

Images