JP2013226620A - Method for manufacturing lens and lens manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a lens and a lens manufacturing apparatus by which the lens can be prevented from coming off even if an oscillation angle is large.SOLUTION: A method for manufacturing a lens is provided for manufacturing a glass lens by grinding or polishing a glass material, and includes a machining process of making a machining object face of the lens abut on the machining face of a grinding wheel grinding or polishing the lens, oscillating the grinding wheel in relation to the lens while rotating at least one of the lens and grinding wheel. In the machining process, the number of revolutions Nof the grinding wheel is changed according to an oscillation angle θ being an angle between a rotation axis of the lens and a rotation axis of the grinding wheel.

Description

  The present invention relates to a lens manufacturing method and a lens manufacturing apparatus for manufacturing a glass lens by grinding or polishing a glass material.

  Conventionally, a glass lens is ground or polished by bringing a processing surface of a tool such as a pitch, a pad or a grindstone into contact with a processing surface of a glass material to be processed, and supplying a polishing liquid or a grinding liquid. In addition, either one or both of the tool and the tool are rotated, and either one is swung and the both are rubbed together (for example, see Patent Document 1).

  FIG. 12 is a schematic view showing a part of a conventional lens manufacturing apparatus. A lens manufacturing apparatus 9 shown in FIG. 12 includes a lens holder 92 that holds a lens 91 that is a processing target, a work shaft 93 that rotatably supports the lens holder 92, and a grindstone 94 that has a concave spherical processing surface 94a. The tool holder 95 holding the grindstone 94 and the tool shaft 96 connected to the tool holder 95 are provided. The tool shaft 96 is provided with a motor (not shown) that rotationally drives the tool holder 95 via the tool shaft 96. Further, the rotation drive mechanism 97 including the tool holder 95 and the tool shaft 96 includes a swing mechanism (not shown) that swings the rotation drive mechanism 97 on a spherical surface centered on the spherical center O of the machining surface 94a. Is provided. FIG. 12 shows an example of a lens manufacturing apparatus that rotates the grindstone 94 while allowing the lens 91 to rotate freely and swings the grindstone 94.

JP 2009-202263 A

Incidentally, in the lens manufacturing system 9 illustrated in FIG. 12, when the swing angle θ becomes larger is the angle between the rotation axis R ₂ of the rotating shaft R ₁ and the grindstone 94 of the lens 91, the lens relative to the processing surface 94a The amount of protrusion of the work surface 91a 91 increases, and the moment applied to the lens 91 increases. As a result, there is a problem that the lens 91 jumps out of the lens holder 92 and the processing cannot be continued. In particular, when processing a lens with a thin edge portion or a lens whose side surface is coated, the side surface of the lens 91 cannot be directly held, so that the lens 91 has a predetermined processing position (inside the processing surface 94a). ) Was easy to jump out of.

  The present invention has been made in view of the above, and provides a lens manufacturing method and a lens manufacturing apparatus capable of preventing the lens from jumping out from a predetermined processing position even when the swing angle becomes large. For the purpose.

  In order to solve the above-described problems and achieve the object, a lens manufacturing method according to the present invention is a lens manufacturing method for manufacturing a glass lens by grinding or polishing a glass material. And a working surface of a tool that grinds or polishes the lens, while rotating and driving at least one of the lens and the tool, the tool is swung with respect to the lens, A processing step of grinding or polishing the lens, wherein the processing step includes at least one of the lens and the tool according to a swing angle that is an angle formed between the rotation axis of the lens and the rotation axis of the tool. One of the features is that the number of rotations is changed.

  In the lens manufacturing method, in the processing step, the tool is driven to rotate, the lens is driven by the rotation of the tool, the rotation speed of the tool is increased as the swing angle increases, and the swing is performed. The number of rotations of the tool is decreased as the angle decreases.

  In the lens manufacturing method, the processing step rotates the tool to cause the lens to follow the rotation of the tool, and when the swing angle becomes larger than a predetermined value, the rotation speed of the tool is set. The number of rotations of the tool is decreased when the swing angle becomes a predetermined value or less.

  In the lens manufacturing method, in the processing step, the rotation speed of the tool is set to be larger than the rotation speed of the lens, and the lens and the tool are rotationally driven in the same direction to increase the swing angle. The number of rotations of the lens is increased as the rotation angle decreases, and the number of rotations of the lens is decreased as the swing angle decreases.

  In the lens manufacturing method, in the processing step, the rotation speed of the tool is set larger than the rotation speed of the lens, the lens and the tool are respectively rotated in the same direction, and the swing angle is a predetermined value. The rotation speed of the lens is increased when the rotation angle becomes larger than the rotation angle, and the rotation speed of the lens is decreased when the swing angle becomes a predetermined value or less.

  The lens manufacturing apparatus according to the present invention is a lens manufacturing apparatus that manufactures a glass lens by grinding or polishing a glass material, and a lens holder that holds the lens, and a processing surface that comes into contact with a processing surface of the lens A tool for grinding or polishing the lens, a tool holder for holding the tool, and rotating the at least one of the lens holder and the tool holder to rotate the tool relative to the lens. A rotation drive mechanism for rotating the tool, a swing mechanism for swinging the tool relative to the lens by driving at least one of the lens holder and the tool holder, and the rotation drive mechanism and the swing mechanism. A control unit that controls the operation of the moving mechanism, and the control unit is formed by a rotation axis of the lens holder and a rotation axis of the tool holder. Whenever a is in accordance with the swing angle, and performing at least one control for changing the rotational speed of said and the lens tool.

  According to the present invention, when the swing angle becomes larger than a predetermined value, control is performed to change the rotation speed of the glass material or the tool. Therefore, even when the swing angle is large, the lens from the predetermined processing position is controlled. Can be prevented from popping out.

FIG. 1 is a partial cross-sectional side view showing a partial configuration of the lens manufacturing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a graph for explaining a method of controlling the rotational speed of the grindstone in the lens manufacturing method according to Embodiment 1 of the present invention. FIG. 3 is a longitudinal sectional view showing the positional relationship between the glass material and the grindstone according to the swing angle. FIG. 4 is a diagram for explaining the force that the glass material receives from the grindstone in the positional relationship shown in FIG. 3. FIG. 5 is a longitudinal sectional view showing the positional relationship between the glass material and the grindstone according to the swing angle. FIG. 6 is a diagram for explaining the force that the glass material receives from the grindstone in the positional relationship shown in FIG. FIG. 7 is a diagram for explaining the force that the glass material receives from the grindstone when the control according to Embodiment 1 of the present invention is performed. FIG. 8 is a partial cross-sectional side view showing a partial configuration of the lens manufacturing apparatus according to Embodiment 2 of the present invention. FIG. 9 is a graph for explaining a method of controlling the rotation speed of the glass material in the lens manufacturing method according to Embodiment 2 of the present invention. FIG. 10 is a diagram for explaining the force that the glass material receives from the grindstone when the control according to the second embodiment of the present invention is performed. FIG. 11 is a graph for explaining a method for controlling the rotational speed of a grindstone or a glass material in a lens manufacturing method according to a modification. FIG. 12 is a schematic diagram illustrating a partial configuration of a conventional lens manufacturing apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited by these embodiments. Moreover, in description of each drawing, the same code | symbol is attached | subjected and shown to the same part. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each part are different from the actual ones. Also between the drawings, there are included portions having different dimensional relationships and ratios.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a partial configuration of the lens manufacturing apparatus according to Embodiment 1 of the present invention. A lens manufacturing apparatus 1 shown in FIG. 1 is an apparatus that manufactures a glass lens by polishing or grinding a glass material, and a lens holder 11 that holds a lens 10 to be processed, and a lens holder 11 that has a rotation axis R. A work shaft 12 that is rotatably supported around ₁ , a grindstone 20 that is a tool for processing the lens 10, a tool holder 21 that holds the grindstone, a rotation drive mechanism 25 that rotationally drives the tool holder 21, and a tool holder 21 A swing mechanism 26 that swings the lens, a nozzle 31 that supplies a grinding liquid or a polishing liquid (hereinafter referred to as a processing liquid) 30 between the processing surface 10a of the lens 10 and the processing surface 20a of the grindstone 20, and a lens. A control unit 40 that comprehensively controls the operation of the entire manufacturing apparatus 1, a rotation drive control unit 41 that controls the operation of the rotation drive mechanism 25, and a swing control that controls the operation of the swing mechanism 26. And a 42.

The work shaft 12 is installed such that its central axis (rotation axis R ₁ ) is vertical. Further, the work shaft 12 is provided with a load means (not shown), and the lens 10 has the processing surface 20a through the lens holder 11 and the work shaft 12 in a state where the processing surface 10a is in contact with the processing surface 20a. Is pressurized against. Thereby, the lens 10 rotates following the rotation of the grindstone 20 by the processing resistance between the processing surface 20a and the processing surface 10a.

The grindstone 20 has a processing surface 20a having a concave spherical shape for grinding or polishing the processing surface 10a of the lens 10 into a convex spherical shape.
In addition to the grindstone 20, a polishing pitch or a pad may be used as a tool for grinding or polishing the lens 10. Further, the shape of the processed surface 20a is not limited to the concave spherical shape, and may be a convex spherical shape or the like. In this case, the lens 10 is processed into a concave spherical shape.

The rotation drive mechanism 25 includes a tool shaft 22 that rotatably supports the tool holder 21 around the rotation axis R ₂ , a motor 23 that generates a rotation driving force for rotating the tool holder 21, and a rotation drive that the motor 23 generates. And a transmission mechanism 24 that transmits force to the tool shaft 22.

The swing mechanism 26 swings the rotation drive mechanism 25 on a spherical surface centered on the spherical center O of the processing surface 20a while maintaining the relative position of each part of the rotation drive mechanism 25. Hereinafter, the angle formed by the rotation axis R ₁ and the rotation axis R ₂ is referred to as a swing angle θ.

  The nozzle 31 is provided with a machining liquid supply mechanism (not shown). The processing liquid supply mechanism includes, for example, a container that stores the processing liquid, a pump that supplies the processing liquid from the container to the nozzle 31, a pump driving unit that drives the pump, and a pump driving unit under the control of the control unit 40. And a pump control unit for controlling the operation. While the lens 10 is being processed in the lens manufacturing apparatus 1, the processing liquid supply mechanism appropriately supplies the processing liquid 30 to the work part (contact surface between the lens 10 and the grindstone 20) via the nozzle 31.

  The control unit 40 is realized by, for example, a general-purpose computer such as a personal computer, and controls each unit of the lens manufacturing apparatus 1 by reading a predetermined control program into hardware such as a CPU. Specifically, the control unit 40 starts the processing of the lens 10 by operating the rotation drive mechanism 25 and the swing mechanism 26, and the tool according to the magnitude of the swing angle θ during the processing of the lens 10. In order to change the rotation speed of the holder 21 (that is, the grindstone 20), the rotation drive control unit 41 and the swing control unit 42 are controlled. Such a control part 40 may be provided with the memory | storage part which memorize | stored the table and relational expression which show the relationship between rocking angle (theta) required for control of the rotation speed of the grindstone 20, and rotation speed. In the present invention, the “number of rotations” refers to the number of rotations per unit time.

Next, a lens manufacturing method according to Embodiment 1 will be described.
First, the user attaches the grindstone 20 to the tool holder 21 shown in FIG. 1 and attaches the grindstone 20 to the lens manufacturing apparatus 1 via the tool holder 21. Then, the lens 10 is fixed to the lens holder 11 by an air suction mechanism (not shown), the upper shaft is lowered, and the lens 10 is pressed from above toward the processing surface 20a of the grindstone 20.

  Subsequently, the user starts the operation of the lens manufacturing apparatus 1. In response to this, the control unit 40 outputs control signals to the rotation drive control unit 41 and the swing control unit 42 to start the rotation and swing motions of the grindstone 20 by the rotation drive mechanism 25 and the swing mechanism 26. . Further, the control unit 40 outputs a control signal to a machining liquid supply mechanism (not shown), and starts supply of the machining liquid 30 from the nozzle 31.

  Thereby, the lens 10 is rotated by the grindstone 20 due to the friction generated between the processed surface 10a and the processed surface 20a, and is rotated by the processing resistance between the processed surface 10a and the processed surface 20a. Grinded or polished. In addition, since the lens 10 is only rotated by the rotation of the grindstone 20, the rotation speed (rpm) of the lens 10 is smaller than the rotation speed (rpm) of the grindstone 20.

During the processing of the lens 10, the control unit 40 controls the number of rotations around the rotation axis R _{2 of} the tool shaft 22, that is, the grindstone 20 according to the rocking angle θ of the grindstone 20 in a cycle as shown in FIG. FIG. 2 is a graph for explaining a method for controlling the rotational speed of the grindstone 20. As shown in FIG. 2, in the first embodiment, the grindstone 20 is oscillated at a predetermined cycle in the range of α ≦ θ ≦ β. In accordance with this oscillation cycle, the rotation speed N ₁ increases in conjunction with the increase in the oscillation angle θ, and the rotation speed N ₁ decreases in association with the decrease in the oscillation angle θ. The rotational speed N ₁ is varied in the range of N _α ≦ N ₁ ≦ N _β .

The reason why the rotational speed N ₁ of the grindstone 20 is controlled in this way will be described with reference to FIGS. 3 and 5 are longitudinal sectional views showing the positional relationship between the lens 10 and the grindstone 20 according to the swing angle θ. 4, 6, and 7 are diagrams for explaining the force that the lens 10 receives from the grindstone 20 according to the positional relationship between the lens 10 and the grindstone 20, when viewed from the upper side of the lens 10. Is shown. 4 corresponds to the positional relationship shown in FIG. 3, and FIGS. 6 and 7 correspond to the positional relationship shown in FIG.

As shown in FIG. 4, the rotational speed (m / s) at each position on the processing surface 20a of the grindstone 20 increases as the distance from the rotational axis R ₂ increases. At this time, the lens 10 is rotated by the grindstone 20 and rotated by the influence of the frictional force generated in the region A ₁ where the processing surface 10a and the processing surface 20a are in contact with each other.

For this reason, when the lens 10 having the rotation axis R ₁ is eccentric with respect to the grindstone 20 having the rotation axis R ₂ , the lens 10 is more from the grindstone 20 on the eccentric side (left side in FIG. 4). Receive the power of For example, on the X axis shown in FIG. 4, the lens 10 receives more force from the grindstone 20 to rotate downward in the figure than the force to rotate upward in the figure. 4, 6, and 7, the length of the arrow conceptually indicates the relative magnitude relationship between the speed (broken line) or the magnitude of the force (solid line). It does not accurately indicate the quantitative relationship.

  However, as shown in FIGS. 3 and 4, when the swing angle θ is small (for example, when the swing angle θ is the minimum value α), that is, when the eccentricity of the lens 10 with respect to the grindstone 20 is small, the lens 10 is The force in a specific direction (downward in FIG. 4) received from the grindstone 20 is not so great.

  On the other hand, as shown in FIG. 5, when the rocking angle θ is large (for example, when the rocking angle θ is the maximum value β), that is, when the eccentricity of the lens 10 with respect to the grindstone 20 is large, it is shown in FIG. As described above, the force in the specific direction (downward in FIG. 6) received by the lens 10 from the grindstone 20 increases. For this reason, the sum total of the force which the lens 10 receives from the grindstone 20 will work as force which makes the lens 10 jump out of the processing surface 20a.

Therefore, in the first embodiment, control is performed so that the rotational speed N ₁ of the grindstone 20 increases as the swing angle θ increases (see FIG. 2). In this case, as the rotational speed N ₁ increases and the rotational speed at each position on the processing surface 20a increases, more processing liquid 30 enters the region A ₂ where the processing surface 10a contacts the processing surface 20a. become. As a result, a water film is generated by the machining liquid 30 at the interface between the two, and the friction coefficient is lowered. As a result, as shown in FIG. 7, the force itself that the lens 10 receives from the grindstone 20 decreases, and the force that causes the lens 10 to jump out of the processing surface 20a also decreases. In this way, the lens 10 can be prevented from popping out.

  The control unit 40 processes the lens 10 for a predetermined time while changing the rotational speed of the grindstone 20 in this way. Thereafter, the operations of the rotation drive mechanism 25 and the swing mechanism 26 are stopped. Thereby, a glass lens that has been ground or polished by a predetermined amount can be obtained.

  As described above, according to the first embodiment, since the rotational speed of the grindstone 20 is changed in accordance with the increase / decrease of the swing angle θ, even when the swing angle θ increases, the processed surface 20a. It is possible to prevent the lens 10 from jumping out. Therefore, it is possible to improve the yield in lens manufacturing.

  In the first embodiment, the rotational speed of the grindstone 20 is also increased or decreased in conjunction with the increase or decrease of the swing angle θ. However, the threshold value of the swing angle θ is set in advance, and the swing angle θ is set to the threshold value. If it exceeds, the rotational speed of the grindstone 20 is increased, and when the swing angle θ is equal to or less than the threshold value, the rotational speed of the grindstone 20 may be decreased or returned to the original.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
FIG. 8 is a schematic diagram showing a partial configuration of the lens manufacturing apparatus according to Embodiment 2 of the present invention. The lens manufacturing apparatus 2 shown in FIG. 8 operates with respect to the lens manufacturing apparatus 1 shown in FIG. 1 under the control of the rotation driving mechanism 15 that rotates the lens holder 11 and the control unit 40. And a rotation drive control unit 43 for controlling the above. The rotation drive mechanism 15 includes a motor 13 that generates a rotation drive force for rotating the lens holder 11, and a transmission mechanism 14 that transmits the rotation drive force generated by the motor 13 to the work shaft 12. The configuration of the lens manufacturing apparatus 2 other than the rotation drive mechanism 15 and the rotation drive control unit 43 is the same as that of the first embodiment.

Next, a lens manufacturing method according to Embodiment 2 will be described.
First, the user attaches the grindstone 20 to the tool holder 21 shown in FIG. 8 and attaches the grindstone 20 to the lens manufacturing apparatus 2 via the tool holder 21. Then, the lens 10 is fixed to the lens holder 11 by an air suction mechanism (not shown), the upper shaft is lowered, and the lens 10 is pressed from above toward the processing surface 20a of the grindstone 20.

  Subsequently, the user starts the operation of the lens manufacturing apparatus 2. In response to this, the control unit 40 outputs control signals to the rotation drive control units 41 and 43 and the swing control unit 42 to start the rotational movement of the lens 10 by the rotation drive mechanism 15 and to rotate the rotation drive mechanism 25. And the rotational movement and the rocking | fluctuation movement of the grindstone 20 are started by the rocking | fluctuation mechanism 26. FIG. At this time, in the initial state, the rotational speed (rpm) of the grindstone 20 is set to a value larger than the rotational speed (rpm) of the lens 10. In addition, after the initial state, the rotational speed of the grindstone 20 is appropriately set so as to satisfy the fluctuation of the rotational speed of the lens 10 described later (for example, the rotational speed of the grindstone 20 is higher than the rotational speed of the lens 10). May be set to a lower value).

  Further, the rotation directions of the lens 10 and the grindstone 20 are set in the same direction. Further, the control unit 40 outputs a control signal to a machining liquid supply mechanism (not shown) to start supplying the machining liquid 30 from the nozzle 31. Thereby, the lens 10 and the grindstone 20 rotate at mutually different rotational speeds, and the lens 10 is ground or polished by the processing resistance between the processing surface 10a and the processing surface 20a.

During the processing of the lens 10, the control unit 40 controls the rotation speed of the work shaft 12, that is, the rotation axis R _{1 of the} lens 10 with a cycle as shown in FIG. 9 according to the rocking angle θ of the grindstone 20. FIG. 9 is a graph for explaining a method of controlling the rotation speed of the lens 10. As shown in FIG. 9, also in the second embodiment, the grindstone 20 is swung at a predetermined cycle in the range of α ≦ θ ≦ β. In accordance with this oscillation cycle, the rotation speed N ₂ increases in conjunction with the increase in the rotation angle θ, and the rotation speed N ₂ decreases in association with the decrease in the rotation angle θ. The rotational speed N ₂ is varied in a range of N _α ≦ N ₂ ≦ N _β .

The reason why the rotational speed N ₂ of the lens 10 is controlled in this way will be described with reference to FIG. FIG. 10 is a diagram for explaining the force acting on the lens 10 according to the positional relationship between the lens 10 and the grindstone 20, and shows a case viewed from the upper side of the lens 10. FIG. 10 corresponds to the positional relationship shown in FIG.

As described above, when the swing angle θ increases (see FIG. 5) and the eccentricity of the lens 10 with respect to the grindstone 20 increases, the force in a specific direction that the lens 10 receives from the grindstone 20 also increases. Therefore, in the second embodiment, when the swing angle θ increases, the rotation speed N ₂ is increased to increase the rotation speed at each position on the processing surface 20a. As a result, a larger amount of the processing liquid 30 enters a region A ₂ where the processing surface 10a and the processing surface 20a are in contact with each other, and a water film is generated by the processing liquid 30 at the interface between the two, thereby reducing the friction coefficient. As a result, the force itself that the lens 10 receives from the grindstone 20 decreases, and the force that causes the lens 10 to jump out of the processing surface 20a also decreases. In this way, the lens 10 can be prevented from popping out.

  The control unit 40 processes the lens 10 for a predetermined time while changing the rotational speed of the lens 10 in this way. Thereafter, the operations of the rotation drive mechanisms 15 and 25 and the swing mechanism 26 are stopped. Thereby, a glass lens that has been ground or polished by a predetermined amount can be obtained.

  As described above, according to the second embodiment, the rotational speed of the lens 10 is changed in accordance with the increase / decrease of the swing angle θ, so that even when the swing angle θ increases, the processed surface 20a. It is possible to prevent the lens 10 from jumping out. Therefore, it is possible to improve the yield in lens manufacturing.

  Also in the second embodiment, a threshold value of the swing angle θ is set in advance, and when the swing angle θ exceeds the threshold value, the rotation speed of the lens 10 is increased so that the swing angle θ is equal to or less than the above threshold value. In such a case, the control may be performed to reduce the rotational speed of the lens 10 to the original value.

(Modification)
In the first and second embodiments, control is performed so that the rotational speed of the grindstone 20 or the lens 10 changes in a sine curve shape in accordance with the swing angle θ that changes in a sine curve shape. However, the shape of the change in the rotational speed is not particularly limited. For example, as shown in FIG. 11, when the swing angle θ changes to a linear shape (triangular shape), the rotational speed of the grindstone 20 or the lens 10 is linear (triangular) according to the cycle of the swing angle θ. It may be changed. Alternatively, when the swing angle θ changes in a sine curve shape, the rotational speed of the grindstone 20 or the lens 10 may be changed linearly (triangular) in accordance with the cycle of the swing angle θ. In any case, the control may be performed so that the rotational speed of the grindstone 20 or the lens 10 increases when the swing angle θ increases.

  The first and second embodiments and the modifications described above are particularly effective when grinding or polishing a lens whose outer periphery is difficult to be pressed with a holder or the like. This is because such a lens can only hold the lens surface sandwiched between the lens holder and the grindstone, and therefore is greatly affected by the force received from the rotating grindstone when the swing angle θ increases. Specific examples of such a lens include a biconvex lens and a convex meniscus, a lens whose edge portion is difficult to hold thin, a biconcave lens and a plano-concave lens, and a lens whose outer periphery is coated. Is mentioned.

  In the first and second embodiments and the modification, the grindstone 20 or the lens 10 is controlled according to the rocking angle θ by the control of the rotation drive control units 41 and 43 and the rocking control unit 42 operating under the control unit 40. The rotation speed was adjusted. However, a sensor for detecting the swing angle θ may be provided separately, and the rotational drive control units 41 and 43 may adjust the rotational speed of the grindstone 20 or the lens 10 based on the output value of the sensor.

  Embodiments 1 and 2 described above are merely examples for carrying out the present invention, and the present invention is not limited to these. Further, the present invention can form various inventions by appropriately combining a plurality of constituent elements disclosed in the first and second embodiments and the modifications thereof. The present invention can be variously modified in accordance with specifications and the like, and various other embodiments are possible within the scope of the present invention.

1, 2, 9 Lens manufacturing apparatus 10, 91 Lens 10a, 91a Work surface 11, 92 Lens holder 12, 93 Work shaft 13, 23 Motor 14, 24 Transmission mechanism 15, 25, 97 Rotation drive mechanism 20, 94 Grinding stone 20a 94a Machining surface 21, 95 Tool holder 22, 96 Tool shaft 26 Oscillating mechanism 30 Working fluid 31 Nozzle 40 Control unit 41, 43 Rotation drive control unit 42 Oscillation control unit

Claims (6)

In a lens manufacturing method for manufacturing a glass lens by grinding or polishing a glass material,
The processing surface of the lens and a processing surface of a tool for grinding or polishing the lens are brought into contact with each other, and at least one of the lens and the tool is rotationally driven, and the tool is moved with respect to the lens. Rocking and grinding or polishing the lens,
The machining step is characterized in that the number of rotations of at least one of the lens and the tool is changed according to a swing angle that is an angle formed by a rotation axis of the lens and a rotation axis of the tool. Lens manufacturing method. The processing step is
Rotationally driving the tool to cause the lens to follow the rotation of the tool;
The lens manufacturing method according to claim 1, wherein the rotational speed of the tool is increased as the swing angle increases, and the rotational speed of the tool is decreased as the swing angle decreases. The processing step is
Rotationally driving the tool to cause the lens to follow the rotation of the tool;
The rotation speed of the tool is increased when the swing angle becomes larger than a predetermined value, and the rotation speed of the tool is decreased when the swing angle becomes a predetermined value or less. Item 4. The lens manufacturing method according to Item 1. The processing step is
Set the rotation speed of the tool larger than the rotation speed of the lens, and rotate and drive the lens and the tool in the same direction,
The lens manufacturing method according to claim 1, wherein the rotation speed of the lens is increased as the swing angle is increased, and the rotation speed of the lens is decreased as the swing angle is decreased. The processing step is
Set the rotation speed of the tool larger than the rotation speed of the lens, and rotate and drive the lens and the tool in the same direction,
The rotation speed of the lens is increased when the swing angle becomes larger than a predetermined value, and the rotation speed of the lens is decreased when the swing angle becomes a predetermined value or less. Item 4. The lens manufacturing method according to Item 1. In a lens manufacturing apparatus that manufactures a glass lens by grinding or polishing a glass material,
A lens holder for holding the lens;
A tool that has a processing surface in contact with a processing surface of the lens, and that grinds or polishes the lens;
A tool holder for holding the tool;
A rotational drive mechanism for rotating the tool relative to the lens by rotationally driving at least one of the lens holder and the tool holder;
A swing mechanism that swings the tool relative to the lens by driving at least one of the lens holder and the tool holder;
A control unit for controlling operations of the rotation drive mechanism and the swing mechanism;
With
The control unit performs control to change the number of rotations of at least one of the lens and the tool according to a swing angle that is an angle formed by a rotation axis of the lens holder and a rotation axis of the tool holder. The lens manufacturing apparatus characterized by performing.

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