JP2010235393A - Mold for forming lens, device for forming lens and lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for forming lens and a device for forming lens which enables a user to check relative deviation between two surfaces of an incident surface and a light-emission surface of a lens on the lens forming surface of a mold in a forming process and to perform adjustment on a submicron level. <P>SOLUTION: An optical lens forming surface 3 for forming the incident surface of the lens is formed on an upper mold 1, and a fine hole 1a through which a laser beam 5 as an optical beam passes is formed penetratingly on a lens optical center part when an optical lens is formed on the optical lens forming surface 3. On the other hand, an optical lens forming surface 4 for forming the light-emission surface of the lens is formed on the lower mold 2 disposed opposite to the upper mold 1, and a fine hole 2a through which a laser beam 5 passes is formed penetratingly on a lens optical center part when the optical lens is formed on the optical lens forming surface 4. A laser beam 5 passing through both of the fine holes 1a, 1b is measured by a light receiving device 7 and, thereby, the positional deviation between the optical lens forming surfaces 3, 4 is detected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens molding die in which a lens molding die is placed opposite to the lens, a lens molding device using the lens molding die, the lens molding die, or a lens molded by the lens molding device. Is.

  Conventionally, the relative deviation between the two surfaces of the light entrance surface and the light exit surface of the lens causes a tilt of the optical axis of the lens, and reduces the light collection capability of the optical lens. As a result, the image quality of the lens of the imaging system is deteriorated, for example, the image is unclear, and the aberration is deteriorated in the recording pickup lens, so that a predetermined light collecting performance cannot be obtained.

  Therefore, the relative displacement between the two surfaces of the light entrance surface and the light exit surface of the lens is the most important accuracy in lens molding, and the amount of relative displacement is 3 μm or less as the accuracy of the lens increases. Therefore, a technique for measuring and correcting the misalignment position is required.

  For this purpose, in Patent Document 1, a processing edge is formed on the lens molding surface of the molding die, as shown in the plan view of FIG. 7A and the AA sectional view in FIG. 7A of FIG. In addition, a ring body 25 is formed concentrically on one lens surface 27 of the molded lens, and a similar ring body 26 is also formed on the other lens surface 28.

And the positional relationship between the ring bodies 25 and 26 is measured with respect to the lens 24 in which the ring bodies 25 and 26 are formed using a high-precision image measuring device, and the ring bodies 25 and 26 obtained from the measurement results are measured. The position of the center axis of the lens is adjusted by the deviation.
JP 2005-169930 A

  However, in the conventional method described in Patent Document 1, the adjustment accuracy is affected by the fine radius of the edges of the rings 25 and 26, the accuracy of the image measuring instrument, and the molding accuracy of the molded product, and the measurement accuracy is limited to 1 μm. It is.

  In addition, the conventional method cannot be evaluated until the lens is molded, and it is expected that the number of adjustments will increase as the accuracy increases.

  In recent years, resin lenses for high pixels are required to have a relative displacement of 1 μm or less between the light incident surface and the light exit surface of the lens, and are also compatible with blue lasers for recording lenses. The resin lens to be used is required to have a deviation accuracy of 0.5 μm.

  With respect to the required accuracy, the method of Patent Document 1 has a limit of evaluation up to 1 μm, and the object to be measured is a ring body and not the lens center itself. Deviation between the center position and the positions of the ring bodies 25 and 26 also occurs at the submicron level, and is not a technique that can evaluate 1 μm or less.

  In addition, if the relative deviation between the light incident surface and light exit surface of the lens of 1 μm or less is changed due to changes in the molding environment or temperature fluctuations of the molding device, the confirmation after molding is 1 μm or more. Even if it exceeds the limit, it will make a large amount of defective products.

  In addition, the evaluation of the deviation of 1 μm or less by the confirmation after molding requires that the sample for evaluation be taken after confirming that the molding environment and the molding apparatus are stable to 1 μm or less. The time for stabilizing the 1 μm state is 12 hours or more after the temperature rise including the environment. Adjustment of the mold by such evaluation after molding takes a huge number of adjustment days, and 1 μm molding cannot be realized at the mass production level.

  The present invention solves the above-mentioned problems of the prior art, and indicates that the relative misalignment between the light incident surface and the light exit surface of the lens is 1 μm or less. An object of the present invention is to provide a lens molding die, a lens molding apparatus, and a lens which can be confirmed above and can be adjusted at a submicron level.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided one mold surface that molds the light incident surface of the lens, and the light emitting surface of the lens that is placed opposite to the one mold surface. In a lens molding die comprising the other mold surface, a light passing through-hole is formed through the central portion of the optical coordinate of the lens molding surface of the one mold surface, and the lens on the other mold surface is formed. It is characterized in that a fine hole for passing light is formed through the center of the optical coordinate of the molding surface.

  According to a second aspect of the present invention, in the lens molding die according to the first aspect, three or more lens molding surfaces are provided so as to face each other.

  According to a third aspect of the present invention, in the lens molding die according to the second aspect of the present invention, in the lens molding surface formed by three or more, one of the two microholes is centered on the lens optical axis. The other fine hole was formed so that the center of one of the fine holes was shifted from the center of the other fine hole within the diameter of the fine hole from the center of the lens optical axis. It is characterized by that.

  A fourth aspect of the present invention is a lens molded by the lens molding die according to any one of the first to third aspects, and has a minute hole molding trace in the vicinity of the center of the lens. .

  According to a fifth aspect of the present invention, in the lens molding apparatus, a fine hole is formed through the center of the optical coordinate of the lens molding surface of one of the mold surfaces facing each other, and the lens molding surface of the other mold surface is formed. The lens molding die according to any one of claims 1 to 3, which is formed by penetrating and forming a fine hole in a central portion of the optical coordinate, and a light source that emits a light beam that passes through the fine hole. And

  According to a sixth aspect of the present invention, in the lens molding apparatus according to the fifth aspect, the light beam is a laser beam.

  According to a seventh aspect of the present invention, in the lens molding apparatus according to the fifth or sixth aspect of the present invention, a light receiving device that receives a light beam and measures the amount of light is provided.

  According to an eighth aspect of the present invention, in the lens molding apparatus according to the fifth aspect of the present invention, three or more lens molding surfaces are provided to be opposed to each other in the lens molding die.

  According to a ninth aspect of the present invention, in the lens molding apparatus according to any one of the fifth to eighth aspects, the light beam is respectively passed through the micro holes in the three lens molding surfaces.

  According to a tenth aspect of the present invention, in the lens molding apparatus according to the ninth aspect, the three light beams are received, and the mold moving direction is detected based on a difference between the received light amounts.

  According to an eleventh aspect of the present invention, in the lens molding apparatus according to the ninth aspect, a light receiving device for measuring the optical interference wavefronts of the three light beams is provided.

  According to a twelfth aspect of the present invention, in the lens molding apparatus according to the eleventh aspect, the mold moving direction is detected by the optical interference wavefronts of the three light beams.

  According to a thirteenth aspect of the present invention, in the lens molding device according to the first aspect, the lens molding material is glass.

  The invention described in claim 14 is the lens molding apparatus according to claim 1, wherein the lens molding material is a thermoplastic resin.

  According to a fifteenth aspect of the present invention, in the lens molding apparatus according to the first aspect, the lens molding material is a thermosetting resin.

  A sixteenth aspect of the present invention is a lens molded by the lens molding apparatus according to any one of the fifth to fourteenth aspects, and has a minute hole molding trace in the vicinity of the center of the lens.

  According to the present invention, the minute hole through which the light beam passes is formed opposite to the center of the lens optical axis of the lens forming surface facing the mold, and the positional deviation between the facing lens forming surfaces is changed to the light passing through the minute hole. This can be done by evaluating the light quantity of the beam or the optical interference wavefront, and confirming the relative displacement between the light incident surface and light output surface of the molded lens on the lens molding surface of the mold during the molding process. can do. Therefore, after confirming the deviation, it becomes possible to shift to molding.

  Further, when three fine holes through which the light beam passes are formed in the center portion of the optical axis of the lens molding surface, one of the two opposed fine holes is formed by shifting in two directions in the XY direction. The direction of misalignment can be confirmed before molding, and it is possible to shift to molding after correcting the misalignment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1A and 1B show a lens mold according to Embodiment 1 of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view.

  In FIG. 1, an upper lens 1 having one mold surface is formed with an optical lens molding surface 3 for molding a light incident surface of the lens on the molding surface, and the optical lens molding surface 3 is molded as an optical lens. A fine hole 1a having a diameter of 20 μm through which the laser beam 5 that is a light beam passes is formed through the center of the optical coordinate that is the center of the optical axis of the lens. The fine hole 1a is an opening on the narrow side of the tapered hole 1b formed in the upper mold 1 so as to spread toward the laser light source 6 side.

  The upper mold 1 is fixed to a mounting plate 10 that transfers heat from a heating element such as a heater, and a laser light source 6 is mounted at a position where it is thermally insulated from the mounting plate 10. As the laser light source 6, a laser light emitting laser semiconductor that can emit a beam with a laser spot narrowed down to 20 μm is used.

  An optical lens molding surface 4 that molds the light exit surface of the lens is formed on the lower mold 2 having the other mold surface that is placed opposite to the upper mold 1, and is molded as an optical lens on the optical lens molding surface 4. In the center of the optical coordinate, which is the center of the optical axis of the lens, a fine hole 2a having a diameter of 20 μm through which the laser light 5 passes is formed. The fine hole 2a is an opening on the narrowed side of the tapered hole 2b formed in the lower mold 2 so as to spread toward the light receiving device 7 side.

  The light receiving device 7 is attached to a position where it is insulated from the sliding plate 11. The lower mold 2 is heated from a heating body (not shown) through the sliding plate 11.

  The contact portion between the sliding plate 11 and the lower mold 2 is slidable, and the servo motor 8 is attached to the sliding plate 11. The tip of the lead screw 9 provided on the output shaft of the servo motor 8 is screwed into the female thread portion of the lower mold 2. As shown in FIG. 1A, a pair of the servo motor 8 and the lead screw 9 is installed so as to be orthogonal to each other in the XY direction on the side surface of the lower mold 2. As a result, when each servo motor 8 rotates, the lower mold 2 can operate in two directions of the X axis and the Y axis.

  In the above configuration, the fine hole 1a of the upper mold 1 is formed as a fine hole having a diameter of 20 μm that does not leak resin on the molded product side, and is formed on the constricted side of the tapered hole 1b that is widened on the laser light source 6 side. Has been. This allows the laser beam 5 to pass through without being blocked by the upper mold 1 until the laser beam enters the fine hole 1a.

  In addition, when the laser beam 5 is tilted and deviates from the fine hole 1a, an effect that the reflected light from the tapered hole 1b is not reflected by the fine hole 1a and can not pass through the fine hole 1a is obtained. Only the laser beam 5 that has directly reached the fine hole 1a can pass through the fine hole 1a.

  The shape of the fine hole 2a of the lower mold 2 is the same as that of the fine hole 1a. The shape of the tapered hole 2b is formed as a fine hole having a diameter of 20 μm that does not leak resin on the molded product side, and the light receiving device 7 side is widened. It is formed on the constriction side. As a result, the laser beam 5 can be allowed to pass through without being blocked by the lower mold 2 until the laser beam 5 that has passed through the fine hole 2 a enters the light receiving device 7.

  When a product is molded, when a small amount of resin or glass leaks from the fine holes 2a, it remains on the hole side of the lower mold 2 instead of remaining on the product side, so that no debris that becomes a foreign object remains on the product side. There is an effect that can be made. The foreign matter remaining on the lower mold 2 can be removed with a suction device or the like.

  In order to obtain the above effect, the tips of the tapered holes 1b and 2b have a taper of 10 ° or more, and in order to reliably capture the laser beam 5, from a position 0.2 mm away from the molded product surface, the taper is 30 °. To do. The reason why the molded product surface where the fine holes 1a and 2a are opened is not formed directly at 30 ° because the hole is deformed because there is no edge strength when it is a 30 ° tapered edge.

  In the above configuration, by detecting and measuring the amount of light in the light spot received by the light receiving device 7 of the laser light 5, whether or not the laser light is incident at the correct position, that is, the light incident surface and the light exit surface of the lens. It can be determined whether or not the optical axes are aligned.

  A series of control flows in the first embodiment will be described with reference to the flowchart shown in FIG. These control and measurement calculations are processed in a CPU (Central Processing Unit) that exchanges data with each part of the apparatus.

  In FIG. 2, an initial laser light amount emitted from the laser light source 6 is measured by the light receiving device 7 in step S <b> 101. This data is recorded in the CPU memory. In step S102, the servo motor 8 in the X-axis direction is driven and moved by 1 μm in the X direction. The light quantity at this time is measured by the light receiving device 7. In step S103, the initial light amount in step S101 is compared with the light amount when moved by 1 μm in step S102.

  If it is larger than the initial light amount, the process returns to step S102 and is further moved by 1 μm in the X direction. After that, in step S103, the light quantity immediately before step S102 is compared with the light quantity when moved by 1 μm, and when the light quantity in step S102 becomes smaller than the previous light quantity, the previous position is peaked. The position returns in the minus direction of 1 μm and goes to step S105.

  If the light intensity is smaller than the initial light intensity, the process goes to step S104, moves minus 1 μm in the X direction, goes to step S105, and compares it with the light intensity in step S103. When the same light amount or the light amount has increased, the process returns to step S104, and is moved minus 1 μm in the X direction.

  In step S105, the previous light amount that moves in the minus direction is compared with the light amount obtained in the step S104 when the light amount moves minus 1 μm, and when the light amount in step S104 becomes smaller than the previous light amount, the previous position. Is returned to the positive direction by 1 μm, and the process goes to step S106. The peak value in the X direction is recorded in the memory.

  In step S106, it moves in the Y direction by 1 μm plus. The amount of light at that time is measured. In step S107, the Y direction peak value light amount is compared with the light amount in step S106. When it is larger than the Y direction peak value light amount, the process returns to step S106, and further moved to 1 μm in the Y direction plus direction. In step S107, the previous light amount moving in the plus direction is compared with the light amount obtained by moving by 1 μm in step S106, and when the light amount in step S106 becomes smaller than the previous light amount, the previous position. As a peak position, return to the direction of 1 μm plus, and go to step S110.

  In step S107, when the X direction peak value light amount is compared with the step S106 light amount, if it is smaller than the X direction peak value light amount, the process proceeds to step S108, moves in the Y direction by minus 1 μm, and the light amount at this time is measured. . In step S109, the previous light amount moving in the minus direction is compared with the light amount obtained by moving minus 1 μm in step S108. When the light amount in step S108 becomes smaller than the previous light amount, the previous position is obtained. Return to the positive direction by 1 μm and go to step S110.

  At the time of step S110, since the positions of the peak values of the X and Y light quantities are reached, the overlap of the 20 μm micro holes 1a and 2a is the most coincident position. It becomes.

  The movement is performed by moving the lower mold 2 in the X and Y directions using the servo motor 8, and is adjusted to focus on the peak position of the laser light amount in the light receiving device 7, so that the OK position is obtained. That is, the optical axis position accuracy can be 1 μm or less.

  3, (a) is a laser power distribution diagram in the light receiving device 7 when the fine hole 1a of the upper mold 1 and the fine hole 2a of the lower mold 2 coincide (OK position). ) Is an explanatory view showing that the positions of the fine holes 1a and 2a coincide. Further, (a ′) is a laser power distribution diagram in the light receiving device 7 when the fine holes 1a and 2a are displaced (NG position), and (b ′) is an explanation showing that the positions of the fine holes 1a and 2a are displaced. FIG.

  In this way, the laser light 5 is partially blocked by shifting and closing the two fine holes 1a and 2a, so that the total amount of laser light received by the light receiving device 7 is reduced. By controlling the laser light quantity and performing the operation based on the control flowchart shown in FIG. 2 with the configuration shown in FIG. 1, the center of the optical axis between the two surfaces of the light incident surface and the light exit surface of the molded lens is Measurement can be performed on the mold of 1 and the lower mold 2 so that the optical axes coincide with each other.

  Using the lens molding die of the present embodiment having the above-described configuration, the material to be molded is introduced into the lens molding surface 4 of the lower die 2 as a glass ball, and the lens molding surfaces 3 and 4 of the upper die 1 and the lower die 2 are formed. In addition, molding is performed by applying heat and pressing, whereby a high-precision glass lens is molded.

  Further, by using the lens mold of the present embodiment, a thermoplastic resin is injected between the lens molding surfaces 3 and 4 of the upper mold 1 and the lower mold 2 and solidified at a predetermined mold temperature to be molded. A high-precision resin lens is molded.

  Also, using the lens mold of the present embodiment, a thermosetting resin is injected between the lens molding surfaces 3 and 4 of the upper mold 1 and the lower mold 2 and cured at a predetermined mold temperature to be molded. Thus, a highly accurate resin lens is molded.

  In the glass lens and the resin lens molded by the lens mold according to the present embodiment, as shown in the sectional view of the molded lens in FIG. 4A and the enlarged view of the molding marks in FIGS. Since the glass or resin is slightly pushed out by the internal pressure into the fine holes 1a and 2a, a convex portion which is a slight molding mark is formed on the surface of the molded lens L. Although the boundary of the convex portion remains as round marks (A) and (B), there is no problem because the lens center optically does not affect the refractive action. By observing this molding mark, the center position of the molded lens L can be confirmed.

  FIGS. 5A and 5B are diagrams for explaining a lens mold according to Embodiment 2 of the present invention, in which FIG. 5A is a plan view of the lens mold and an explanatory view of a laser light receiving state, and FIG. 5B is a diagram of the lens mold. It is sectional drawing.

  In FIG. 5, the upper mold 12 has three optical lens molding surfaces 14 formed on its molding surface. The optical lens molding surface 14 is disposed at a position in FIG. 5A, c position formed at a position on the Y axis on the XY axis, and b position formed on the X axis. Yes. In each optical lens molding surface 14, a fine hole 12 a having a diameter of 20 μm through which a laser beam 16 passes penetrates the optical coordinate center portion that becomes the optical axis center when the molding lens surface 14 is molded as an optical lens. Is formed. Since a 20 μm hole cannot be drilled in the mold for processing, the opening on the side where the tapered hole 12b is narrowed is formed as the fine hole 12a.

  The upper mold 12 is fixed to a mounting plate 21 that transfers heat from a heating body (not shown), and three laser light sources 17 are provided at positions insulated from the mounting plate 21, and laser light 16 is applied to each micro hole 12 a. It is attached so as to be incident. As the laser light source 17, a semiconductor laser that emits red light and can emit a beam with a laser spot narrowed down to 20 μm is used.

  Three optical lens molding surfaces 15 are formed on the lower die 13 facing the upper die 12 so as to correspond to the optical lens molding surface 14 of the upper die 12, and the molding lens surface 15 is formed on each optical lens molding surface 15. A fine hole 13a having a diameter of 20 μm through which the laser beam 16 passes is formed through the center of the optical coordinate, which is the center of the optical axis when molded as an optical lens. Each fine hole 13 a is an opening on the side where the tapered hole 13 b formed in the lower mold 13 is constricted.

  The micro hole 13a at the position a provided in the lower mold 13 is formed at the same position as the micro hole 12a of the corresponding upper mold 12, and the micro hole 13a at the position c is formed with respect to the micro hole 12a of the corresponding upper mold 12. Are formed at positions shifted within the diameter of the microholes in the Y direction (1 μm shift in this example), and the microholes 13a at the position b are located in the X direction with respect to the corresponding microholes 12a of the upper mold 12. It is formed at a position shifted within the diameter (in this example, shifted by 1 μm).

  Three light receiving devices 18 that respectively receive the laser beams 16 that pass through the micro holes 13 a of the lower mold 13 are attached to the sliding plate 22 at positions insulated from the sliding plate 22. The contact portion between the sliding plate 22 and the lower mold 13 is slidable, and the servo motor 19 is attached to the sliding plate 22. The tip of the lead screw 20 provided on the output shaft of the servo motor 19 is screwed into the female screw of the lower mold 13. As a result, when each servo motor 19 rotates, the lower mold 13 can operate in two directions of the X axis and the Y axis shown in FIG.

  In the above configuration, by detecting the laser light quantity of each laser spot in each light receiving device 18 that receives each laser light 16, whether or not the laser light is incident at the correct position, that is, the light incident surface and light output surface of the lens. It can be determined whether or not the optical axis is aligned.

  In the first embodiment, the initial misalignment direction could not be confirmed. However, in the second embodiment, the micro holes 13a at the position a provided in the lower mold 13 are positioned at the same pitch as the micro holes 12a in the upper mold 12. (FIG. 5-a'-), the micro hole 13a at the position c is formed at a position shifted by 1 .mu.m from the Y axis (FIG. 5-c'-), and the micro hole 13a at the position b is shifted by 1 .mu.m from the X axis. Therefore, the laser light amount of the light receiving device 18 at these three initial positions is compared with the laser light amount of the light receiving device 18 when a deviation occurs. It is possible to recognize which side is shifted.

  In FIG. 5, −a−, −b−, and −c− indicate initial values of laser power distribution diagrams in the light receiving device 18 corresponding to the respective positions a, b, and c. For example, if the lower mold 13 is displaced in the plus direction on the Y axis, the laser light amount at the position c is increased.

  A series of control flows in the second embodiment will be described with reference to a flowchart shown in FIG. These control and measurement calculations are processed in a CPU (Central Processing Unit) that exchanges data with each part of the apparatus.

  In step S201, the initial laser light amounts at the positions a, b, and c are measured by the corresponding light receiving devices 18. This data is recorded in the CPU memory. In step S202, the light amounts at the three a, b, and c positions are compared. Depending on the result, the process goes to any step of S203, S206, or S212. If it is determined in step S203, it is moved by minus 1 μm in the Y direction in step S204. In step S205, the light amount after moving in step S204 is compared with the standard value light amount obtained with a deviation of 1 μm or less. At this time, if the standard value light quantity has been reached, the position adjustment is completed (step S215).

  Next, when it is determined in step S206, it is verified in step S207 whether or not the standard light amount has been reached. If it has reached the position OK (step S215), positioning is not necessary. If the standard value light amount has not been reached, the process goes to step S208, and moves by 1 μm in the X direction. In step S209, it is compared with the standard value light amount. If it has reached the standard value light amount, the alignment is completed (step S215). If not reached, it moves minus 1 μm in the X direction and goes to step S210. In step S210, the position moves by 1 μm in the Y direction. In step S211, it is compared with the standard value light amount. If the standard value light quantity has been reached, alignment is complete (step S215).

  If it is determined in step S212, it is moved minus 1 μm in the X direction in step S213. In step S214, the light amount is compared with the standard value light amount. If the standard value light amount is reached, the alignment is completed (step S215). If the light quantity standard value has not been reached, after moving plus 1 μm in the X direction, go to step S210, and move plus 1 μm in the Y direction in step S210. In step S211, it is compared with the standard value light amount. If the standard value light quantity has been reached, alignment is complete (step S215).

  By this series of steps, the upper mold 12 and the lower mold 13 are aligned. The upper mold 12 and the lower mold 13 are moved in the same manner as in the first embodiment. Accordingly, the center of the optical axis between the light incident surface and the light exit surface of the molded lens can be measured and adjusted on the mold to be molded.

  Further, in the second embodiment, it is possible to confirm the direction of deviation between the upper mold 12 and the lower mold 13 by comparing the amount of light received by each light receiving device 18.

  It is also conceivable that the light receiving device 18 includes a light receiving device that measures the optical interference wavefront of each laser beam 16 and detects the mold moving direction based on the optical interference wavefront of each laser beam 16.

  INDUSTRIAL APPLICABILITY The present invention is effective in molding a high-precision lens using a thermosetting resin for realizing a high-precision glass lens mold for a digital still camera and a high-heat-resistant high-precision lens. In particular, it is effective for a resin lens by injection molding using a thermoplastic resin, and also effective for a lens for a small mobile phone. Further, the present invention can be used not only as a general lens mold but also as a position detection mechanism with high accuracy for position detection of a mold using an upper mold and a lower mold.

1 shows a lens mold according to Embodiment 1 of the present invention, where (a) is a plan view and (b) is a cross-sectional view. Flowchart relating to control in the first embodiment (A), (a ') is a laser power distribution diagram in the light-receiving device of the first embodiment, and (b), (b') are explanatory diagrams of matching states of opposing micro holes of the first embodiment. It is explanatory drawing which shows the characteristic of the lens shape | molded with the lens shaping | molding die of this Embodiment, (a) is sectional drawing of a shaping | molding lens, (b), (c) is a partially expanded view. It is a figure explaining the lens mold in Embodiment 2 of this invention, Comprising: (a) is a top view of a lens mold, and explanatory drawing of the light-receiving state of a laser beam, (b) is sectional drawing of a lens mold. Flowchart relating to control in the second embodiment It is explanatory drawing of the conventional molded lens, (a) is a top view of a molded lens, AA sectional drawing in (a) of (b)

1,12 Upper mold 1a, 12a Upper mold micro hole 1b, 12b Upper mold taper hole 2,13 Lower mold 2a, 13a Lower mold micro hole 2b, 13b Lower mold taper hole 3,14 Upper mold lens molding Surfaces 4 and 15 Lower mold lens molding surfaces 5 and 16 Laser light 6 and 17 Laser light sources 7 and 18 Light receiving devices 8 and 19 Servo motors 9 and 20 Lead screw screws 10 and 21 Mounting plates 11 and 22 Sliding moving plate L Molding lens

Claims (16)

  In the lens molding die comprising one mold surface that molds the light incident surface of the lens and the other mold surface that is placed opposite to the one mold surface and molds the light exit surface of the lens, A fine hole for light passage is formed through the center of the optical coordinate of the lens molding surface of one mold surface, and a micro hole for light passage is formed through the center of the optical coordinate of the lens molding surface of the other mold surface. A lens molding die characterized by being formed.   3. The lens molding die according to claim 1, wherein three or more lens molding surfaces are provided so as to face each other.   In the lens molding surface formed by three or more, one of the micro holes is formed such that the center of the micro hole is on the center of the lens optical axis, and the other micro hole is formed at the center of the lens optical axis. 3. The lens molding die according to claim 2, wherein the center of one of the micro holes is shifted from the center of the other micro hole within a diameter of the micro hole.   A lens molded by the lens molding die according to any one of claims 1 to 3, wherein the lens has a trace of a minute hole in the vicinity of the center of the lens. A fine hole is formed through the center of the optical coordinate of the lens molding surface of one mold surface facing the mold, and a micro hole is formed through the center of the optical coordinate of the lens molding surface of the other mold surface. The lens molding die according to any one of Items 1 to 3,
A lens forming apparatus comprising: a light source that emits a light beam that passes through the fine hole.   6. The lens forming apparatus according to claim 5, wherein the light beam is a laser beam.   The lens molding apparatus according to claim 5, further comprising a light receiving device that receives the light beam and measures a light amount.   6. The lens molding apparatus according to claim 5, wherein three or more lens molding surfaces are provided opposite to each other in the lens molding die.   The lens molding apparatus according to claim 5, wherein a light beam is passed through each of the micro holes in the three lens molding surfaces.   The lens molding apparatus according to claim 9, wherein the three light beams are received, and a mold moving direction is detected based on a difference between the received light amounts.   The lens forming apparatus according to claim 9, further comprising a light receiving device that measures an optical interference wavefront of the three light beams.   The lens molding apparatus according to claim 11, wherein a mold moving direction is detected by an optical interference wavefront of the three light beams.   The lens molding apparatus according to claim 1, wherein the lens molding material is glass.   The lens molding apparatus according to claim 1, wherein the lens molding material is a thermoplastic resin.   The lens molding apparatus according to claim 1, wherein the lens molding material is a thermosetting resin.   A lens molded by the lens molding apparatus according to claim 5, wherein the lens has a minute hole molding trace in the vicinity of the center of the lens.

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