JP5973800B2 - Lens manufacturing apparatus and lens manufacturing method - Google Patents

Description

  The present invention relates to a lens manufacturing apparatus and a lens manufacturing method for centering a polished lens.

  In the lens manufacturing process, after the lens is polished, a centering process is performed in which the outer peripheral surface of the lens is ground to a predetermined shape and size in order to match the optical axis of the lens with the central axis of the lens outer diameter. To be implemented. Since the outer peripheral surface of the lens serves as a reference surface when the lens is incorporated into an optical device such as a camera, it is very important to perform centering with high accuracy.

  Prior to this centering process, centering is performed to match the optical axis of the lens with the central axis of the lens outer diameter. As a centering method, a bell clamp method in which both ends of the lens are clamped by the tips of two bell holders (pointing ends) with the center axis (machine axis) aligned with each other, and inspection light is applied to the lens. An optical centering method (for example, refer to Patent Document 1) is known in which an image formed by irradiating an image of the transmitted light or reflected light is observed and an eccentric state of the lens is detected and adjusted. . The bell clamp method is widely used because it is advantageous in terms of cost and can be easily performed. On the other hand, the optical centering method is more complicated than the bell clamp method, but has an advantage that centering with higher accuracy can be performed.

Japanese Patent Application Laid-Open No. 2002-239883

  By the way, when manufacturing a cemented lens in which the lens surfaces of two lenses are bonded to each other, a method is generally employed in which the two lenses are centered and then both are aligned and cemented. ing. Conventionally, the bell clamp method has been mainly used for centering in this case, and the following problems have arisen. That is, in the bell clamp method, the centering accuracy is lower than that in the optical centering method, and decentering and variation in the outer diameter are likely to occur in the centered lens. For this reason, time is required for alignment (centering) when the lenses are joined. In addition, since the lens was slid with the lens between the two front end toys, the lens surface was easily damaged.

  On the other hand, according to the optical centering method, since high-precision centering is possible, high-quality lenses can be manufactured by accurately centering. In the optical centering method, since the lens is held on the holder using a thermoplastic adhesive or the like, the lens surface is hardly damaged. For this reason, it is more preferable if an optical centering method can be adopted also in the manufacture of a cemented lens. However, there has been no lens manufacturing apparatus that can easily perform centering by an optical centering method. In addition, when manufacturing a cemented lens, it is necessary to remove the centered lens from the centering device, center the two lenses again, and then join these lenses. It becomes complicated.

  The present invention has been made in view of the above, and a lens manufacturing apparatus capable of easily manufacturing a high-quality cemented lens obtained by performing centering using an optical centering method, and It is an object to provide a lens manufacturing method.

  In order to solve the above-described problems and achieve the object, a lens manufacturing apparatus according to the present invention is provided in a lens manufacturing apparatus in which a plurality of lenses are centered and centered by a grindstone. First and second lens holders that respectively hold the first and second lenses; a first lens holding shaft that supports the first lens holder and is rotatable together with the first lens holder; The second lens is provided coaxially with the rotation axis of the first lens holding shaft, supports the second lens holding tool, and is rotatable around the rotation axis together with the second lens holding tool. A first lens adjustment that is provided on the holding shaft and the first lens holding shaft and adjusts a position in a direction orthogonal to the rotation axis and an inclination with respect to the rotation axis with respect to the first lens holder. Mechanism and the second lens A second lens adjusting mechanism provided on a holding shaft for adjusting a position in a direction orthogonal to the rotation axis and a tilt with respect to the rotation axis with respect to the second lens holder; and the second lens adjustment mechanism with respect to the rotation axis. The first lens holding shaft and the second lens holding shaft are arranged so that the decentering detection unit for detecting the decentering of the optical axes of the first and second lenses and the first and second lenses can be combined. And a moving mechanism for moving along the rotation axis.

  In the lens manufacturing apparatus, the eccentricity detection unit emits inspection light to an area between the first lens holder and the second lens holder on the rotation shaft and enters from the area. A light emitting / receiving element that detects the inspection light; an optical system that includes at least one reflecting surface and is detachable from the region; and a relative position of the reflecting surface with respect to the light emitting / receiving element; By changing the angle, the traveling direction of the inspection light emitted from the light emitting / receiving element and reflected by the at least one reflecting surface along the rotation axis is changed to the direction of the first lens holding axis. And an optical path changing mechanism for switching between the direction of the second lens holding shaft.

  In the lens manufacturing apparatus, the optical system reflects the inspection light in the direction of the first lens holding axis and the inspection light in the direction of the second lens holding axis. And the optical path changing mechanism moves at least one of the light emitting / receiving element and the optical system relatively in parallel with the rotation axis.

  In the lens manufacturing apparatus, the optical system has at least one reflecting surface rotatable around an axis orthogonal to the rotation axis, and the optical path changing mechanism rotates the at least one reflecting surface. Features.

  In the lens manufacturing apparatus, the eccentricity detection unit emits first inspection light toward a region between the first lens holder and the second lens holder on the rotation axis, and A first light receiving and emitting element that detects the first inspection light incident from the region, and a second inspection light that is emitted toward the region and the second inspection light that is incident from the region are detected. And a first reflecting surface that reflects the first inspection light emitted from the first light emitting / receiving element in the direction of the first lens holding axis along the rotation axis. A second reflecting surface that reflects the second inspection light emitted from the second light emitting / receiving element in the direction of the second lens holding axis along the rotation axis, and in the region And an optical system that is detachably provided.

  The lens manufacturing apparatus further includes an optical system moving mechanism for inserting or retracting the optical system with respect to the region.

  In the lens manufacturing apparatus, the eccentricity detection unit emits the first inspection light along the rotation axis toward the first lens holder and enters from the direction of the first lens holder. A first light-receiving / emitting element that detects the first inspection light; and a second inspection light that is emitted in the direction of the second lens holder along the rotation axis, and the second lens holder. And a second light receiving and emitting element that detects the second inspection light that is incident from the direction.

  In the lens manufacturing apparatus, the first and second light emitting / receiving elements are provided in a region between the first lens holder and the second lens holder on the rotation shaft, And a moving mechanism for inserting or retracting the second light emitting / receiving element with respect to the region.

  In the lens manufacturing apparatus, at least the first lens holding shaft detachably supports the first lens holder.

  The lens manufacturing apparatus further includes an adhesive application device that applies an adhesive to at least one of the first lens and the second lens.

  The lens manufacturing method according to the present invention is a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone, with respect to the first and second lens holding shafts arranged on the same rotation axis. A lens mounting step for mounting the first and second lenses so as to oppose each other via the first and second lens holders, and the first lens and the second lens on the rotation axis; An optical system having at least one reflecting surface is disposed in a region between them, and inspection light incident on the optical system through an optical path outside the rotation axis is reflected by the optical system toward the first lens. And adjusting the relative position and / or orientation of the optical path and the optical system, and causing the inspection light to be incident on the first lens along the rotation axis through the region. , According to the first lens A first centering step of detecting an eccentricity of the first lens with respect to the rotation axis and adjusting a position and / or an inclination of the first lens by detecting the inspection light reflected by The relative position and / or orientation of the optical path and the optical system is changed so that the inspection light incident on the optical system through the optical path is reflected by the optical system in the direction of the second lens. And changing the inspection light into the second lens along the rotation axis through the region and detecting the inspection light reflected by the second lens. And a second centering step of adjusting the position and / or tilt of the second lens by detecting the eccentricity of the lens with respect to the rotation axis.

  The lens manufacturing method according to the present invention is a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone, and the first and second lens holding shafts arranged on the same rotation axis are used. On the other hand, a lens mounting step for mounting the first and second lenses so as to face each other through the first and second lens holders, respectively, and an optical system having two reflecting surfaces on the rotation axis Two inspection lights incident on the two reflecting surfaces through two different optical paths outside the rotation axis in a state of being arranged in a region between the first lens and the second lens An optical system that arranges an optical system that reflects each of the first and second lenses in the direction of the first lens and the first lens along the rotation axis through the area. Incident on the A first centering step of detecting an eccentricity of the first lens with respect to the rotation axis by detecting the inspection light reflected by the first lens and adjusting a position and / or an inclination of the first lens; The inspection light is incident on the second lens along the rotation axis through the region, and the inspection light reflected by the second lens is detected, whereby the inspection light of the second lens is detected. A second centering step of detecting the eccentricity with respect to the rotation axis and adjusting the position and / or inclination of the second lens, and the first centering step and the second centering step can be performed simultaneously. It is characterized by being.

  The lens manufacturing method according to the present invention is a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone, and the first and second lens holding shafts arranged on the same rotation axis are used. On the other hand, a lens attachment step for attaching the first and second lenses to face each other through the first and second lens holders, respectively, and a first and a second light source that each emit inspection light, The first lens and the second lens on the rotation axis are arranged so that the inspection light emitted from the first and second light sources respectively enters the first and second lenses along the rotation axis. A light source arrangement step arranged in a region between the lens and the inspection light that is incident on the first lens along the rotation axis through the region and reflected by the first lens; By detecting A first centering step of detecting the eccentricity of the lens with respect to the rotation axis and adjusting the position and / or inclination of the first lens; and inspection light along the rotation axis through the region. And detecting the inspection light reflected by the second lens and detecting the eccentricity of the second lens with respect to the rotation axis, and / or the position of the second lens and / or And a second centering step for adjusting the inclination, wherein the first centering step and the second centering step can be performed simultaneously.

  The lens manufacturing method according to the present invention is a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone, and the first and second lens holding shafts arranged on the same rotation axis are used. On the other hand, a lens attaching step for attaching the first and second lenses to face each other through the first and second lens holders, and the inspection light, the first lens on the rotation axis, and the The first light is incident on the first lens along the rotation axis through a region between the second lens and the inspection light reflected by the first lens is detected. A first centering step of detecting the eccentricity of the lens with respect to the rotation axis and adjusting the position and / or inclination of the first lens; and after the first centering step, the inspection light is transmitted through the region. Said second along the axis of rotation By detecting the inspection light reflected by the second lens and detecting the decentering of the second lens with respect to the rotation axis, the position and / or inclination of the second lens can be determined. A second centering step of adjusting, and a merging step of moving at least one of the first lens and the second lens along the rotation axis and merging with each other.

  In the lens manufacturing method, at least a part of an optical system capable of emitting inspection light toward the first lens and the second lens along the rotational axis before the first centering step. An optical system disposing step of disposing the optical system in the region and an optical system retracting step of retracting at least a part of the optical system from the region after the second centering step are further included.

  In the lens manufacturing method, in the combining step, the first lens and the second lens are bonded with an adhesive, and the outer peripheral surfaces of the first and second lenses bonded to each other are ground or polished. The method further includes a centering step.

  According to the present invention, the first and second lens holding shafts arranged on the same axis are arranged so that two lenses are opposed to each other via the lens holder, and the eccentricity detecting unit detects the eccentricity of these lenses. And a moving mechanism for moving the first and second lens holding shafts so that these lenses can be combined, a high-precision centering and centering by an optical centering method is performed. A quality cemented lens can be easily manufactured.

FIG. 1 is a partial cross-sectional top view showing a configuration example of a lens manufacturing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a front view of the lens manufacturing apparatus shown in FIG. FIG. 3 is a flowchart showing the lens manufacturing method according to Embodiment 1 of the present invention. FIG. 4 is a schematic diagram for explaining a process of centering the left lens in FIG. FIG. 5 is a schematic diagram for explaining a process of centering the right lens in FIG. FIG. 6 is a schematic diagram illustrating a process of applying an adhesive to the lens of FIG. FIG. 7 is a schematic diagram illustrating a process of centering the cemented lens. FIG. 8 is a schematic diagram illustrating a process of removing the cemented lens from the lens manufacturing apparatus. FIG. 9 is a partial cross-sectional top view illustrating a configuration example of a lens manufacturing apparatus according to Embodiment 2 of the present invention. 10 is a partial cross-sectional top view showing a state in which the optical path of the inspection light is changed in the lens manufacturing apparatus shown in FIG. FIG. 11 is a partial cross-sectional top view illustrating a configuration example of a lens manufacturing apparatus according to Embodiment 3 of the present invention. FIG. 12 is a top view showing a part of a configuration example of a lens manufacturing apparatus according to Embodiment 4 of the present invention. FIG. 13 is a cross-sectional view illustrating a configuration of a lens holder in a modification of the first to fourth embodiments.

  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 partial cross-sectional top view showing a configuration example of a lens manufacturing apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the lens manufacturing apparatus 100 according to the first embodiment centers two polished lenses 1 and 2 and joins the lens surfaces of these lenses 1 and 2 to the outer periphery. It is an apparatus for manufacturing a cemented lens by centering a surface.

More specifically, the lens manufacturing apparatus 100 includes lens holding shafts 10 and 20 that are provided coaxially and opposed to each other on a frame 101, a grindstone spindle 30 that rotatably supports the grindstone 3, and lenses 1 and 2. An eccentricity detection unit 40A for detecting the eccentricity of the above, a monitor 44, an adhesive application device 50, an adhesive curing light source 52, and a control unit 60 for controlling the operations of these units. Among these, the left lens holding shaft 10 is provided with a rotation drive unit 10a that rotates the lens holding shaft 10 about the rotation axis _R0 , and the right lens holding shaft 20 rotates the lens holding shaft 20. A rotation drive unit 20a that rotates about the axis _R0 is provided.

FIG. 2 is a front view of the lens manufacturing apparatus 100. In FIG. 2, the description of the grindstone spindle 30, the adhesive application device 50, and the adhesive curing light source 52 is omitted.
As shown in FIG. 2, the gantry 101 is provided with stages 110, 120, and 130.

The left side stage 110 is provided with a support portion 112 that supports the lens holding shaft 10 and the rotation drive portion 10a. The support portion 112 is provided with a moving mechanism 111 that moves the support portion 112 in parallel with the rotation axis R ₀ . Thereby, the lens holding shaft 10 can move along the rotation axis R ₀ .

The stage 120 on the right side of the figure is provided with a support part 122 that supports the lens holding shaft 20 and the rotation drive part 20a. The support portion 122 is provided with a moving mechanism 121 that moves the support portion 122 in parallel with the rotation axis R ₀ . As a result, the lens holding shaft 20 can move along the rotation axis _R0 .

  By the operation of these moving mechanisms 111 and 121, the lens 1 held by the lens holder 12 described later and the lens 2 held by the lens holder 22 can be combined. The moving mechanisms 111 and 121 may be configured to operate under the control of the control unit 60, or may be manually operated by the user.

The stage 130 is provided between the stage 110 and the stage 120. Further, the stage 130 is provided with a moving mechanism 131 that operates under the control of the control unit 60 and moves the support unit 132 that supports the eccentricity detection unit 40A in a direction orthogonal to the rotation axis R ₀ on the stage 130. It has been. Thereby, the eccentricity detection unit 40A can be inserted into and removed from the region on the rotation axis _R0 between the lens holder 12 and the lens holder 22. FIG. 1 shows a state in which the eccentricity detection unit 40A is inserted into the rotation axis _R0 .

  As shown in FIGS. 1 and 2, the lens holding shaft 10 supports a lens holder 12 that holds the lens 1 via a centering stage 11. The lens holder 12 can rotate together with the lens holding shaft 10. Hereinafter, when the lens manufacturing apparatus 1 is viewed from the upper surface, the upper direction of the paper surface is defined as the X direction, and the depth direction of the paper surface is defined as the Y direction.

The centering stage 11 is a lens adjustment mechanism that adjusts the position of the lens holder 12 in two directions orthogonal to the rotation axis R ₀ and the inclination of the axis of the lens holder 12 with respect to the rotation axis R ₀ . More specifically, the centering stage 11 adjusts the tilt in the XZ plane, an X adjustment unit 11a that adjusts the position of the lens holder 12 in the X direction, a Y adjustment unit 11b that adjusts the position in the Y direction. It has a X _theta adjusting unit 11c, and a Y _theta adjusting unit 11d for adjusting the inclination of the YZ plane. The operation on the centering stage 11 may be performed manually by the user, or may be performed automatically by providing the centering stage 11 with an electric adjustment mechanism that operates under the control unit 60.

  The lens holder 12 has a fixing part 12a and a dish part 12b. The fixing portion 12a is fixed to the centering stage 11 by screwing or fastening. The dish portion 12b is detachably attached to the fixing portion 12a by screwing or fastening. The lens 1 is fixed to the end surface of the dish portion 12b with an adhesive or the like.

  A lens holder 22 that holds the lens 2 is supported on the lens holding shaft 20 via a centering stage 21. The lens holder 22 can rotate together with the lens holding shaft 20.

As with the centering stage 11, the centering stage 21 is a lens adjustment mechanism that adjusts the position of the lens holder 22 and the inclination of the axis of the lens holder 22, and adjusts the position of the lens holder 22 in the X direction. An X adjusting unit 21a, a Y adjusting unit 21b for adjusting the position in the Y direction, an X _θ adjusting unit 21c for adjusting the tilt in the XZ plane, and a Y _θ adjusting unit 21d for adjusting the tilt in the YZ plane. Have. The operation on the centering stage 21 may be performed manually by the user, or may be performed automatically by providing the centering stage 21 with an electric adjusting mechanism that operates under the control unit 60.

  The lens holder 22 is provided to face the lens holder 12 on the left side, and includes a fixing portion 22a and a dish portion 22b. The fixing portion 22a is fixed to the centering stage 21 by screwing or fastening. The dish portion 22b is detachably attached to the fixing portion 22a by screwing or fastening. The lens 2 is fixed to the end surface of the dish portion 22b with an adhesive or the like.

As shown in FIG. 1, the grindstone spindle 30 is installed on a stage 31 provided on the gantry 101 via a moving mechanism (not shown). By this moving mechanism, the grindstone spindle 30 can move two-dimensionally on the stage 31. In addition, the grindstone spindle 30 is provided with a rotation drive unit 32 that rotates the grindstone spindle 30 about the rotation axis R ₁ .

The eccentricity detection unit 40 </ b> A includes a housing 43, a sensor 41 and a triangular mirror 42 housed in the housing 43.
The sensor 41 includes a light source 41a that generates inspection light, a half mirror 41b that reflects and emits inspection light incident from the direction of the light source 41a, and transmits inspection light incident on the sensor 41 from the outside. It is a light emitting / receiving element that incorporates an image sensor 41c such as a CCD that receives inspection light transmitted through the half mirror 41b and outputs image data corresponding to the image of the inspection light. In addition, the sensor 41 may include various optical systems (not shown) such as an imaging optical system that forms an image of inspection light. In the first embodiment, the orientation of the sensor 41 is adjusted so that the optical axis L of the sensor 41 is orthogonal to the rotation axis R ₀ .

  The sensor 41 is provided with a position adjustment unit 41d that operates under the control of the control unit 60 and moves the sensor 41 in a direction orthogonal to the optical axis L. As will be described later, the positional adjustment unit 41d changes the relative positional relationship between the sensor 41 and the triangular mirror 42, and the traveling direction of the inspection light is switched. That is, the position adjusting unit 41d functions as an optical path changing mechanism. Instead of moving the sensor 41, a position adjusting unit may be provided in the triangular mirror 42, and the positional relationship between the two may be changed by moving the triangular mirror 42 side.

  In addition, the sensor 41 moves the sensor 41 along the optical axis L, thereby changing the optical distance between the image sensor 41c and the lenses 1 and 2 to adjust the focus (not shown). Z).

The triangular mirror 42 has reflection surfaces 42a and 42b that reflect the inspection light emitted from the sensor 41 along the rotation axis _R0 . In the first embodiment, the reflecting surfaces 42a and 42b form 90 ° with each other, and the direction of the triangular mirror 42 is adjusted so that the reflecting surfaces 42a and 42b form 45 ° with the rotation axis _R0 . Instead of the triangular mirror 42, a prism having two reflecting surfaces may be used.

Of the wall surface of the housing 43, a window portion 43 a that allows the inspection light to pass is provided in a region facing the reflection surfaces 42 a and 42 b of the triangular mirror 42. When the housing 43 is inserted into the rotation axis R ₀ and the reflecting surfaces 42 a and 42 b are arranged on the rotation axis R ₀ , the decentering of the lenses 1 and 2 can be detected.

  The monitor 44 is a display device such as an LCD, an EL display, or a CRT display, and displays an inspection light image on the screen based on the image data output from the image sensor 41c.

  The adhesive application device 50 includes an adhesive container 50 a that stores an adhesive and a nozzle 50 b that sprays the adhesive, and is placed on a stage 51 provided on the gantry 101 under the control of the controller 60. It is installed via a moving mechanism (not shown) that operates. With this moving mechanism, the adhesive application device 50 can be moved two-dimensionally. As the adhesive, for example, an ultraviolet curable adhesive is used.

  The adhesive curing light source 52 is, for example, a light source device that generates ultraviolet rays, and is installed on a stage 53 provided on the gantry 101 via a moving mechanism (not shown) that operates under the control of the control unit 60. Has been. By this moving mechanism, the adhesive curing light source 52 can be moved two-dimensionally.

  The control unit 60 is realized by, for example, a general-purpose computer such as a personal computer, and controls each unit of the lens manufacturing apparatus 100 by reading a predetermined control program into hardware such as a CPU. Specifically, the control unit 60 controls rotation of the rotation driving units 10a and 20a, movement control of the eccentricity detection unit 40A, position control and operation control of the sensor 41, display control of the monitor 44, movement control of the grindstone spindle 30, and Rotation control, movement control of the adhesive application device 50 and the adhesive curing light source 52 are performed. The control unit 60 may perform these controls individually according to signals input from the outside or automatically according to a predetermined control program. The control unit 60 includes an input unit (keyboard, touch panel, etc.) used when a user inputs various commands and information, and a storage unit that stores a control program for controlling the operation of the lens manufacturing apparatus 100. May be.

  Next, a lens manufacturing method according to Embodiment 1 of the present invention will be described. FIG. 3 is a flowchart showing the lens manufacturing method according to the first embodiment. 4 to 8 are diagrams for explaining the lens manufacturing method according to the first embodiment, and show a part of the lens manufacturing apparatus 1. In the following, a method for manufacturing a cemented lens in which two lenses are cemented will be described.

  First, in step S1, the user removes the two lenses 1 and 2 whose lens surfaces have been polished in a state where the left lens holding shaft 10 and the right lens holding shaft 20 are disposed at both ends of the gantry 101. Attached to the lens holders 12 and 22, respectively. Specifically, the lenses 1 and 2 are respectively attached to the dish parts 12b and 22b with an adhesive, and the dish parts 12b and 22b are fixed to the fixing parts 12a and 22a by screwing or fastening. Thereafter, the user starts the operation of the lens manufacturing apparatus 1.

In the subsequent step S2, the control unit 60 inserts the housing 43 into the rotation axis R ₀ , arranges the triangular mirror 42 so that the reflecting surfaces 42a and 42b pass on the rotation axis R ₀ , and emits the light from the sensor 41. The position of the sensor 41 is adjusted so that the detection light is incident on the reflecting surface 42a. Specifically, as shown in FIG. 4, the sensor 41 is moved to the left side of the figure from the center of the housing 43.

In the subsequent step S3, one lens 1 is centered. In particular, when emits inspection light from the sensor 41, the inspection light is reflected along the axis of rotation R ₀ by the reflecting surface 42a, it is incident through an optical path L ₁ in the lens 1. This detection light is reflected by the lens 1 and returns along the optical path L ₁ , and enters the image sensor 41 c through the half mirror 41 b in the sensor 41. As a result, the inspection light image M ₁ is displayed on the monitor 44.

  The user refers to the monitor 44 and first adjusts the position of the sensor 41 in the X direction so that the reflected spot on one end face side of the lens 1 is in focus. Alternatively, the control unit 60 may automatically adjust the focus.

Subsequently, the control unit 60 rotates the lens holding shaft 10 to display the locus M ₂ of the image M ₁ on the monitor 44. At this time, when the image M ₁ does not coincide with the rotation axis R ₀ , the locus M ₂ of the image M ₁ becomes a circle centered on the rotation axis R ₀ . The radius of the locus M ₂ represents the amount of eccentricity of the lens 1 with respect to the rotation axis R ₀ . The user measures the eccentricity from the image M ₁ and trajectory M ₂ displayed on the monitor 44, the X regulating portion 11a and the Y adjusting section 11b of the centering stage 11 operates on the basis of the amount of eccentricity, the image M _{1 Is made} to coincide with the rotation axis R ₀ .

Subsequently, the position of the sensor 41 is adjusted so that the reflected spot on the other end face side of the lens 1 is in focus, and the lens holding shaft 10 is rotated to display the locus M ₂ of the image M ₁ on the monitor 44. Then, the user operates the X _θ adjustment unit 11 c and the Y _θ adjustment unit 11 d of the centering stage 11 based on the amount of eccentricity measured from the trajectory M ₂ displayed on the monitor 44 to display the image M ₁ on the rotation axis R. Match ₀ . Thereby, the centering with respect to the lens 1 is completed. For details of the centering method, refer to Japanese Patent Application Laid-Open No. 2002-239883. In addition, when the centering stage 11 is provided with an electric adjusting mechanism, the control unit 60 may automatically operate the centering stage 11 via the adjusting mechanism.

In the subsequent step S4, the control unit 60 adjusts the position of the sensor 41 so that the detection light emitted from the sensor 41 enters the reflecting surface 42b. Specifically, as shown in FIG. 5, the sensor 41 and the casing 43 are moved to the right side from the center. Thereby, the inspection light emitted from the sensor 41 is reflected along the rotation axis R ₀ by the reflection surface 42 b and travels in the direction of the lens 2 through the optical path L ₂ .

  In the subsequent step S5, the other lens 2 is centered. The details of the centering step are the same as in step S3.

In the subsequent step S6, as shown in FIG. 6, the control unit 60 retracts the eccentricity detection unit 40A from the rotation axis _R0, while moving the adhesive application device 50 to the vicinity of the lens 1 or 2, and from the nozzle 50b. The adhesive is sprayed to apply the adhesive to the lens surface of the lens 1 or 2. Thereafter, the adhesive application device 50 is retracted. The adhesive may be applied to either the lens 1 or 2 or both. As the type of adhesive, an ultraviolet curable adhesive that is cured by irradiating with ultraviolet rays is preferably used. In this case, the time required for curing can be shortened as compared with other types of adhesives (for example, thermosetting type). The adhesive may be applied manually by the user.

In the subsequent step S7, the control unit 60 moves either or both of the lens holding shafts 10 and 20 along the rotation axis _R0 to bring them closer together, thereby joining the lens surfaces of the lenses 1 and 2 together. Further, the adhesive curing light source 52 is brought close to the bonding surface of the lenses 1 and 2 to irradiate ultraviolet rays to cure the adhesive. Thereafter, the adhesive curing light source 52 is retracted.

  In the subsequent step S8, as shown in FIG. 7, the control unit 60 moves the grindstone spindle 30 in the vicinity of the lenses 1 and 2 (hereinafter referred to as the cemented lens 4) that are cemented with each other. Centering is performed by grinding or polishing at 3.

  In step S <b> 9, the user removes the centered cemented lens 4 from the lens manufacturing apparatus 100. Specifically, as shown in FIG. 8, the dish portion 22b bonded to the lens 2 is released from the fixing portion 22a, and the left lens holding shaft 10 and the right lens holding shaft 20 are retracted to both ends. And the dish part 12b adhere | attached on the lens 1 is removed from the fixing | fixed part 12a. Furthermore, the dish parts 12b and 22b are removed from the cemented lens 4 by dissolving the adhesive using an organic solvent or the like, and the cemented lens 4 is washed. Thereby, the cemented lens 4 is completed.

  As described above, according to the first embodiment, high-precision cemented lenses can be easily manufactured because centering can be performed with high accuracy using the optical centering method. It becomes possible.

  Further, according to the first embodiment, since centering is performed after joining two lenses that are centered with high precision, a high-quality cemented lens with little variation in the outer peripheral surface can be obtained. At this time, since each lens is centered and the cemented lens is centered, the work can be continuously performed without removing the lens from the apparatus. Therefore, the cemented lens can be easily and efficiently performed in a short time. Can be manufactured.

  Further, according to the first embodiment, since the centering process can be performed at a time, the time for the centering process itself can be shortened, and the steps such as the cleaning process of the lens before joining can be reduced. You can also.

In the first embodiment, the reflecting surface 42a, placed 42b 45 ° against the rotation axis R _0, by entering from a direction perpendicular to the rotation axis R ₀ inspection light, rotating the inspection light Reflected along axis _R0 . However, if it is possible to enter the lens 1 along the inspection light on the rotating shaft R _0, angle and for reflecting surface 42a, the rotation axis R ₀ of 42b, the emission direction of the detection light is not particularly limited.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
9 and 10 are partial cross-sectional top views showing a configuration example of the lens manufacturing apparatus according to Embodiment 2 of the present invention. As shown in FIGS. 9 and 10, the lens manufacturing apparatus 200 according to the second embodiment includes an eccentricity detecting unit 40B instead of the eccentricity detecting unit 40A shown in FIG. The configuration of each part of the lens manufacturing apparatus 200 other than the eccentricity detection unit 40B is the same as that in the first embodiment.

The eccentricity detection unit 40B includes a mirror 45 having a rotatable reflecting surface 45a instead of the triangular mirror 42 of the eccentricity detection unit 40A shown in FIG. The reflecting surface 45a is perpendicular to the rotation axis R _0, and is rotatably provided on the shaft R ₂ around through the intersection of the optical axis L of the rotation shaft R ₀ and the sensor 41. Further, the mirror 45, and operates under the control of the control unit 60, the rotation driving mechanism 45b is provided for rotating the mirror 45 to the axis R ₂ around. In the second embodiment, it is not necessary to provide the position adjustment unit 41d (see FIG. 1) in the sensor 41.

When manufacturing the cemented lens of the lenses 1 and 2, in the flowchart shown in FIG. 3, after the lenses 1 and 2 are attached to the lens holders 12 and 22 (step S <b> 1), the control unit 60 Instead of performing the position adjustment (step S2), the rotational drive mechanism 45b is operated to adjust the angle of the mirror 45. Specifically, as shown in FIG. 9, the reflecting surface 45a is directed toward the lens 1, and the angle with the rotation axis _R0 is adjusted to 45 °. Thereby, the inspection light emitted from the sensor 41 is reflected along the rotation axis R ₀ by the reflecting surface 45 a and enters the lens 1 through the optical path L ₃ . Thereafter, the lens 1 is centered (step S3).

Subsequently, instead of moving the sensor 41 (step S4), the control unit 60 operates the rotation drive mechanism 45b to rotate the mirror 45, so that the reflection surface 45a faces the lens 2 as shown in FIG. Then, the angle with the rotation axis R ₀ is adjusted to 45 °. Thereby, the inspection light emitted from the sensor 41 enters the lens 2 along the optical path L ₄ . Thereafter, the lens 2 is centered (step S5). The steps after step S6 are the same as those in the first embodiment.

  As described above, according to the second embodiment, it is not necessary to move the sensor 41 when switching the traveling direction of the inspection light, so that the eccentricity detection unit 41b can be saved in space.

In the second embodiment, a plate-like mirror whose both surfaces are reflection surfaces may be used. In this case, for example, when the inspection light travels in the direction of the lens 1, one reflective surface is directed toward the lens 1, and when the inspection light travels in the direction of the lens 2, the other reflective surface is directed to the lens. If it is directed to the direction 2, the amount of rotation of the mirror when the traveling direction of the inspection light is switched can be reduced. Further, in this case, when the thickness of the mirror is large, may inspection light emitted from the sensor 41 to be reflected on the rotating shaft R _0, tweak along the position of the sensor 41 to the rotation shaft R _0.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
FIG. 11 is a partial cross-sectional top view illustrating a configuration example of a lens manufacturing apparatus according to Embodiment 3 of the present invention. As shown in FIG. 11, the lens manufacturing apparatus 300 according to the third embodiment includes two eccentricity detection units 40C and 40D and a triangular mirror 48 instead of the eccentricity detection unit 40A shown in FIG. The triangular mirror 48 is detachably provided in a region on the rotation axis R ₀ between the lens holder 12 and the lens holder 22. FIG. 11 shows a state in which the triangular mirror 48 is inserted into the region on the rotation axis R ₀ . The configuration of the lens manufacturing apparatus 300 other than the eccentricity detection units 40C and 40D and the triangular mirror 48 is the same as that of the first embodiment.

Each of the eccentricity detection units 40 </ b> C and 40 </ b> D includes a housing 47 and a sensor 41 built in the housing 47. The configuration of the sensor 41 is the same as that in the first embodiment. A part of the wall surface of the housing 47 is provided with a window portion 47 a through which the inspection lights L ₅ and L ₆ emitted from each sensor 41 pass. The casing 47 is also provided with a focus adjustment unit (not shown) that performs focus adjustment by moving the sensor 41 along the optical axis. Both the image data output from each sensor 41 are input to the monitor 44.

The triangular mirror 48 has two reflecting surfaces 48a and 48b that intersect each other at a predetermined angle. Further, the triangular mirror 48 is provided with a moving mechanism (not shown) for inserting / removing the triangular mirror 48 with respect to the rotation axis R ₀ .

Eccentric detector unit 40C is the inspection light L ₅ is reflected by the reflecting surface 48a, it is disposed at a position towards the lens 1 along the axis of rotation R _0. On the other hand, the eccentric detector unit 40D, the inspection light L ₆ is reflected by the reflecting surface 48b, are arranged at positions toward the lens 2 along the axis of rotation R _0.

When manufacturing the cemented lens of the lenses 1 and 2, in the flowchart shown in FIG. 3, after attaching the lenses 1 and 2 to the lens holders 12 and 22, respectively (step S1), the triangular mirror 48 is set to the rotation axis R _0. The centering of the lens 1 (step S3) and the centering of the lens 2 (step S5) are performed simultaneously with the inspection lights L ₅ and L ₆ incident on the lenses 1 and 2, respectively. Thereafter, the triangular mirror 48 is retracted from the rotation axis _R0 . Steps S2 and S4 are not necessary. Further, the steps after step S6 are the same as those in the first embodiment.

  As described above, according to the third embodiment, the lens 1 and the lens 2 can be centered at the same time, and position adjustment for switching the traveling direction of the inspection light becomes unnecessary.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.
FIG. 12 is a top view showing a part of a configuration example of a lens manufacturing apparatus according to Embodiment 4 of the present invention. As shown in FIG. 12, the lens manufacturing apparatus 400 according to the fourth embodiment includes two sensors 71 and 72 instead of the eccentricity detection unit 40A shown in FIG. The sensors 71 and 72 are provided to be detachable with respect to a region on the rotation axis R ₀ between the lens holder 12 and the lens holder 22. FIG. 12 shows a state where the sensors 71 and 72 are inserted in the region on the rotation axis R ₀ . In the fourth embodiment, these sensors 71 and 72 constitute an eccentricity detection unit. The configuration of the lens manufacturing apparatus 400 other than the sensors 71 and 72 is the same as that in the first embodiment.

Each of the sensors 71 and 72 has a configuration in which a light source, a half mirror, and an image pickup device such as a CCD are incorporated (both not shown), like the sensor 41 shown in FIG. In the state shown in FIG. 12, the sensor 71 has its own optical axis aligned with the rotation axis R ₀ and is disposed at a position and orientation where the inspection light L ₇ travels in the direction of the lens 1. On the other hand, the sensor 72 has its own optical axis aligned with the rotation axis R ₀ and is disposed at a position and orientation where the inspection light L ₈ travels in the direction of the lens 2. Both the image data output from these sensors 71 and 72 are input to the monitor 44.

When manufacturing the cemented lens of the lenses 1 and 2, in the flowchart shown in FIG. 3, after the lenses 1 and 2 are attached to the lens holders 12 and 22, respectively (step S1), the sensors 71 and 72 are set to the rotation axis R. _The lens 1 is centered (step S3) and the lens 2 is centered (step S5) while being inserted into ₀ and being incident on the inspection lights L ₇ and L ₈ respectively. Thereafter, the sensors 71 and 72 are retracted from the rotation axis R ₀ . Steps S2 and S4 are not necessary. The steps after step S6 are the same as those in the first embodiment.

  According to the fourth embodiment, the lens 1 and the lens 2 can be centered at the same time, and position adjustment for switching the traveling direction of the inspection light is not necessary.

(Modification 1)
Next, Modification 1 of Embodiments 1 to 4 will be described.
In the first to fourth embodiments, the lens holders 12 and 22 are used as the holders for holding the lenses 1 and 2, respectively, in which the lenses 1 and 2 are fixed to the dish portions 12 b and 22 b with an adhesive. . However, various other methods can be used for the lens holder.

  FIG. 13 is a cross-sectional view showing the configuration of the lens holder in the first modification. As shown in FIG. 13, the lens holder 80 has a pedestal 81 fastened to the end portion (X adjustment portion 21 a) of the centering stage 21 by a bolt 81 a, and a columnar shape provided integrally with the pedestal 81. A suction holding unit 82 and a joint unit 83 that forms a rotary joint structure together with the suction holding unit 82 are provided.

  The joint part 83 is rotatably provided around the suction holding part 82 by a bearing 83a. In addition, a hollow decompression chamber 83b is provided inside the joint portion 83, and a through-hole 83c that communicates the decompression chamber 83b and the outside is provided on the side surface of the joint portion 83. A vacuum pump 90 is connected to the through-hole 83c through a pipe 90a. By operating the vacuum pump 90, the inside of the decompression chamber 83b is decompressed.

  An opening is provided in the end surface 82a of the suction holding portion 82 on the side opposite to the pedestal 81, and an internal space of the suction holding portion 82 communicating with the opening serves as a decompression portion 82b. In addition, a through hole 82 c is provided on the side surface of the suction holding unit 82 to communicate the decompression unit 82 b and the decompression chamber 83 b in the joint unit 83.

  Such a suction-type lens holder 80 may be provided only on the lens holding shaft 20 side, or may be provided on both the lens holding shafts 10 and 20. In the former case, on the lens holding shaft 10 side, a lens holder 12 (see FIG. 1) of the adhesion type similar to that of the first embodiment may be used.

  In step S1 of FIG. 3, when the lens 2 is held by the lens holder 80, the vacuum pump 90 is operated in a state where the lens 2 is in contact with the end face 82a, and the pressure reducing chamber 83b and the pressure reducing portion 82b are depressurized. . Thereby, the lens 2 is sucked and fixed to the suction holding portion 82. In step S9, when the lens 2 joined to the lens 1 is removed from the lens holder 80, the vacuum pump 90 may be stopped to release the decompression chamber 83b and the decompression unit 82b.

  As described above, according to the first modification, the lens can be easily attached to and detached from the lens holding portion. Moreover, according to the modification 1, since the washing | cleaning process of an adhesive agent becomes unnecessary, it becomes possible to simplify a manufacturing process.

(Modification 2)
Next, a second modification of the first to fourth embodiments of the present invention will be described.
The first to fourth embodiments can also be applied to manufacture a cemented lens including three or more lenses. In this case, as shown in FIG. 8, after releasing the dish part 22b from the fixed part 22a, the dish part 22b is removed from the lens 2 using an organic solvent or the like while the lens 1 is held by the lens holder 12. Wash. Then, after the third lens is attached to the right lens holder 22 and centered, it may be joined to the lens 2 side of the cemented lens 4. The centering step in this case may be performed every time a lens is newly joined, or may be performed collectively after the joining of all the lenses is completed.

  If the suction-type lens holder 80 described in Modification 1 is used instead of the right-side lens holder 22, the lens 2 is joined to the lens 1 and then the lens 2 (the suction holder 82) is joined. ) Can be easily removed, and the lens 2 need not be cleaned.

(Modification 3)
In the first to fourth embodiments described above, the centering is performed in the state of the cemented lens 4 in which the lenses 1 and 2 are cemented. However, after the lenses 1 and 2 are centered, the lenses 1 and 2 are cemented together. You may do it. Specifically, in the lens manufacturing apparatus 100 shown in FIG. 1, the centering of the lens 1 is performed by the grindstone 3 while the lens 1 is held by the lens holder 12. Subsequently, the lens 2 is centered, and centering is performed with the grindstone 3 while the lens 2 is held by the lens holder 22. Thereafter, the lens holding shafts 10 and 20 are moved in the center direction along the rotation axis R ₀ , and the centered lens 1 and the lens 2 are bonded using an adhesive.

  According to the third modification, the centered lenses 1 and 2 that are centered with high accuracy by the optical centering method are joined without removing them from the lens manufacturing apparatus 100 while maintaining the centering accuracy. It becomes possible.

  Embodiments 1 to 4 and Modifications 1 to 3 described above are merely examples for carrying out the present invention, and the present invention is not limited to these. Moreover, this invention can form a various invention by combining suitably the some component currently disclosed by each Embodiment 1-4 and the modifications 1-3. 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.

DESCRIPTION OF SYMBOLS 1, 2 Lens 3 Whetstone 4 Joint lens 10, 20 Lens holding shaft 10a, 20a Rotation drive part 11, 21 Centering stage 11a, 21a X adjustment part 11b, 21b Y adjustment part 11c, 21c X ( _theta) adjustment part 11d, 21d Y _θ adjustment unit 12, 22 Lens holder 12a, 22a Fixing unit 12b, 22b Plate unit 30 Grinding wheel spindle 31, 51, 53, 110, 120, 130 Stage 32 Rotation drive unit 40A, 40B, 40C, 40D Eccentricity detection unit 41, 71, 72 Sensor 41a Light source 41b Half mirror 41c Image sensor 42, 48 Triangular mirror 42a, 42b, 45a, 48a, 48b Reflective surface 43, 47 Housing 43a, 47a Window 44 Monitor 45 Mirror 50 Adhesive coating device 50a Adhesive Housing 50b Nozzle 52 Adhesive curing light source 60 Control unit 80 Lens holder 81 Base 81a Bolt 82 Adsorption holding unit 82a End surface 82b Decompression unit 82c, 83c Through-hole 83 Joint unit 83a Bearing 83b Decompression chamber 90 Vacuum pump 100, 200, 300, 400 Lens manufacturing apparatus 101 Base 111, 121 131 Moving mechanism 112, 122, 132 Support part

Claims (14)

In a lens manufacturing device that centers multiple lenses and centers them with a grindstone,
First and second lens holders provided to face each other and holding the first and second lenses, respectively;
A first lens holding shaft that supports the first lens holder and is rotatable together with the first lens holder;
A second lens holder that is provided coaxially with the rotation axis of the first lens holding shaft, supports the second lens holder, and is rotatable around the rotation axis together with the second lens holder. The axis,
A first lens adjustment mechanism that is provided on the first lens holding shaft and adjusts a position in a direction orthogonal to the rotation axis and an inclination with respect to the rotation axis with respect to the first lens holder;
A second lens adjustment mechanism that is provided on the second lens holding shaft and adjusts a position in a direction orthogonal to the rotation axis and an inclination with respect to the rotation axis with respect to the second lens holder;
An eccentricity detecting unit for detecting eccentricity of the optical axes of the first and second lenses with respect to the rotation axis;
A moving mechanism for moving the first lens holding shaft and the second lens holding shaft along the rotation axis so that the first and second lenses can be combined;
The grinding wheel;
An adhesive application device for applying an adhesive to at least one of the first lens and the second lens;
The moving mechanism moves the first lens holding shaft and the second lens holding shaft along the rotation axis, and the adhesive applicator moves at least one of the first lens and the second lens. A control device for applying an adhesive, joining the first and second lenses, and controlling the outer peripheral surface of the joined lenses to be centered by grinding or polishing with the grindstone;
A lens manufacturing apparatus comprising: The eccentricity detection unit is
A light emitting / receiving element that emits inspection light to an area between the first lens holder and the second lens holder on the rotation axis and detects the inspection light incident from the area;
An optical system having at least one reflecting surface and provided to be removable from the region;
The inspection light that is emitted from the light emitting / receiving element and reflected along the rotation axis by changing the relative position and / or angle of the reflecting surface with respect to the light emitting / receiving element. An optical path changing mechanism that switches between the direction of the first lens holding axis and the direction of the second lens holding axis;
The lens manufacturing apparatus according to claim 1, comprising: The optical system includes a first reflecting surface that reflects the inspection light in the direction of the first lens holding axis, and a second reflecting surface that reflects the inspection light in the direction of the second lens holding axis. Have
The lens manufacturing apparatus according to claim 2, wherein the optical path changing mechanism moves at least one of the light receiving and emitting element and the optical system relatively in parallel with the rotation axis. The optical system has at least one reflecting surface rotatable around an axis orthogonal to the rotation axis;
The lens manufacturing apparatus according to claim 2, wherein the optical path changing mechanism rotates the at least one reflecting surface. The eccentricity detection unit is
The first inspection light is emitted toward the region between the first lens holder and the second lens holder on the rotation axis, and the first inspection light incident from the region is emitted. A first light emitting / receiving element to be detected;
A second light receiving and emitting element that emits the second inspection light toward the region and detects the second inspection light incident from the region;
A first reflecting surface that reflects the first inspection light emitted from the first light emitting / receiving element in the direction of the first lens holding axis along the rotation axis, and the second light receiving / emitting element. A second reflection surface that reflects the emitted second inspection light along the rotation axis in the direction of the second lens holding axis, and is provided so as to be detachable from the region. Optical system,
The lens manufacturing apparatus according to claim 1, comprising:   The lens manufacturing apparatus according to claim 2, further comprising an optical system moving mechanism that inserts or retracts the optical system with respect to the region. The eccentricity detection unit is
The first inspection light is emitted in the direction of the first lens holder along the rotation axis, and the first inspection light incident from the direction of the first lens holder is detected. A light emitting / receiving element;
A second inspection light is emitted in the direction of the second lens holder along the rotation axis, and the second inspection light that is incident from the direction of the second lens holder is detected. A light emitting / receiving element;
The lens manufacturing apparatus according to claim 1, comprising: The first and second light emitting / receiving elements are provided in a region between the first lens holder and the second lens holder on the rotation axis,
The lens manufacturing apparatus according to claim 7, further comprising a moving mechanism for inserting or retracting the first and second light emitting / receiving elements with respect to the region.   The lens manufacturing apparatus according to claim 1, wherein at least the first lens holding shaft detachably supports the first lens holder. In a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone,
Lenses that are attached to the first and second lens holding shafts arranged on the same rotation axis with the first and second lenses facing each other through the first and second lens holders, respectively. Installation process;
An optical system having at least one reflecting surface is disposed in a region between the first lens and the second lens on the rotation axis, and enters the optical system through an optical path outside the rotation axis. Adjusting the relative position and / or orientation of the optical path and the optical system so that the inspection light to be reflected by the optical system in the direction of the first lens;
The rotation of the first lens is performed by causing inspection light to enter the first lens along the rotation axis through the region and detecting the inspection light reflected by the first lens. A first centering step of detecting eccentricity with respect to an axis and adjusting the position and / or tilt of the first lens;
The relative position and / or orientation of the optical path and the optical system is adjusted so that the inspection light incident on the optical system through the optical path is reflected by the optical system in the direction of the second lens. Change process to change,
The rotation of the second lens is caused by causing inspection light to enter the second lens along the rotation axis through the region and detecting the inspection light reflected by the second lens. A second centering step of detecting eccentricity with respect to an axis and adjusting the position and / or inclination of the second lens;
A merging step of moving at least one of the first lens and the second lens along the rotation axis, and joining the first lens and the second lens together with an adhesive and combining them; ,
Centering step of grinding or polishing the outer peripheral surfaces of the first and second lenses joined to each other;
The lens manufacturing method characterized by including. In a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone,
Lenses that are attached to the first and second lens holding shafts arranged on the same rotation axis with the first and second lenses facing each other through the first and second lens holders, respectively. Installation process;
An optical system having two reflecting surfaces, and two optical paths different from each other outside the rotation axis in a state of being arranged in a region between the first lens and the second lens on the rotation axis An optical system arrangement step of arranging, in the region, an optical system that reflects two inspection lights respectively incident on the two reflecting surfaces through the first and second lenses.
The rotation of the first lens is performed by causing inspection light to enter the first lens along the rotation axis through the region and detecting the inspection light reflected by the first lens. A first centering step of detecting eccentricity with respect to an axis and adjusting the position and / or tilt of the first lens;
The rotation of the second lens is caused by causing inspection light to enter the second lens along the rotation axis through the region and detecting the inspection light reflected by the second lens. A second centering step of detecting eccentricity with respect to an axis and adjusting the position and / or inclination of the second lens;
A merging step of moving at least one of the first lens and the second lens along the rotation axis, and joining the first lens and the second lens together with an adhesive and combining them; ,
Centering step of grinding or polishing the outer peripheral surfaces of the first and second lenses joined to each other;
Including
The lens manufacturing method, wherein the first centering step and the second centering step can be performed simultaneously. In a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone,
Lenses that are attached to the first and second lens holding shafts arranged on the same rotation axis with the first and second lenses facing each other through the first and second lens holders, respectively. Installation process;
The first and second light sources each emitting inspection light are set so that the inspection light emitted from the first and second light sources is incident on the first and second lenses along the rotation axis. A light source arrangement step of arranging in a region between the first lens and the second lens on the rotation axis;
The rotation of the first lens is performed by causing inspection light to enter the first lens along the rotation axis through the region and detecting the inspection light reflected by the first lens. A first centering step of detecting eccentricity with respect to an axis and adjusting the position and / or tilt of the first lens;
The rotation of the second lens is caused by causing inspection light to enter the second lens along the rotation axis through the region and detecting the inspection light reflected by the second lens. A second centering step of detecting eccentricity with respect to an axis and adjusting the position and / or inclination of the second lens;
A merging step of moving at least one of the first lens and the second lens along the rotation axis, and joining the first lens and the second lens together with an adhesive and combining them; ,
Centering step of grinding or polishing the outer peripheral surfaces of the first and second lenses joined to each other;
Including
The lens manufacturing method, wherein the first centering step and the second centering step can be performed simultaneously. In a lens manufacturing method in which a plurality of lenses are centered and centered by a grindstone,
Lenses that are attached to the first and second lens holding shafts arranged on the same rotation axis with the first and second lenses facing each other through the first and second lens holders, respectively. Installation process;
The inspection light is incident on the first lens along the rotation axis via a region between the first lens and the second lens on the rotation axis, and the first lens A first centering step of detecting an eccentricity of the first lens with respect to the rotation axis by detecting the reflected inspection light and adjusting a position and / or an inclination of the first lens;
After the first centering step, inspection light is incident on the second lens along the rotation axis through the region, and the inspection light reflected by the second lens is detected, A second centering step of detecting the eccentricity of the second lens with respect to the rotation axis and adjusting the position and / or inclination of the second lens;
At least one of said first lens and the second lens is moved along the rotary shaft, and a coalescing step of coalescing by bonding the first lens and the second lens to each other by an adhesive ,
And a centering step of grinding or polishing the outer peripheral surfaces of the first and second lenses joined to each other . An optical system in which at least a part of an optical system capable of emitting inspection light toward the first lens and the second lens along the rotation axis is disposed in the region before the first centering step. System placement process;
An optical system retracting step of retracting at least a part of the optical system from the region after the second centering step;
The lens manufacturing method according to claims 1 to 3, further comprising a.

Images