JP2012108318A - Optical element fixing method and optical element fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical element fixing method by which an optical element can be fixed suitably even if the optical element is not arranged coaxially with a lens barrel.SOLUTION: An optical element fixing method for fixing an optical element arranged in a lens barrel to the lens barrel using an adhesive, includes a gap measurement step S20 for measuring a distance between a circumference of the optical element and an inner surface of the lens barrel, an application quantity determination step S30 for determining an application quantity such that as the distance between the circumference of the optical element and the inner surface of the lens barrel becomes larger, the application quantity of the adhesive at a position corresponding to the distance increases, and an adhesive application step S40 for applying the adhesive based on the application quantity determined by the application quantity determination step by controlling at least one of a relative rotational speed between a nozzle for discharging the adhesive and the lens barrel and an application speed of the adhesive.

Description

  The present invention relates to an optical element fixing method, and more particularly to an optical element fixing method for fixing an optical element to a lens barrel using an adhesive, and an optical element fixing apparatus for executing the optical element fixing method.

  As one method for fixing an optical element such as a lens or a cover glass to a lens barrel, a fixing method using an adhesive is widely known. Conventionally, the fixing method has been performed by an operator applying an adhesive, but in recent years, automation by a robot or a dispenser has been promoted.

  Patent Document 1 describes a lens fixing method in which an adhesive is applied to a lens disposed in a lens barrel using a dispenser. In this fixing method, the lens is placed on a receiving portion provided inside the lens barrel, and adhesive is applied to the peripheral edge of the lens with a dispenser over the entire circumference, thereby maintaining the airtightness inside the lens barrel. It can be fixed.

JP 2009-36822 A

By the way, when an optical element such as a lens is arranged in a lens barrel, it is rare that the central axis of the optical element and the central axis of the lens barrel are completely coaxial. Deviation occurs. If this deviation is within an allowable range in consideration of the performance of the product, the optical element may be fixed to the lens barrel as it is, but at this time, a gap that is the distance between the periphery of the optical element and the inner surface of the lens barrel. The size of is not uniform, and there is a problem that it differs depending on the position in the circumferential direction.
That is, the amount of the adhesive necessary for fixing the lens to the lens barrel is large at the portion where the gap is large, and the adhesive necessary for fixing the lens to the lens tube at the portion where the gap is small. The amount of decreases.

  However, in the lens fixing method described in Patent Document 1, since an equal amount of adhesive is applied regardless of the position in the circumferential direction of the lens, there is a deviation between the central axis of the optical element and the central axis of the lens barrel. There are problems such as insufficient adhesive at one part and insufficient fixation, and too much adhesive at another part and protruding on the optical surface, which impairs the performance of the product.

  The present invention has been made in view of the above circumstances, and provides an optical element fixing method and an optical element fixing apparatus that can be suitably fixed even if the optical element is not arranged coaxially with respect to the lens barrel. Objective.

  A first aspect of the present invention is an optical element fixing method for fixing an optical element arranged in a lens barrel to the lens barrel using an adhesive, and includes a peripheral edge of the optical element and an inner surface of the lens barrel. A gap measuring step for obtaining the distance, a coating amount determining step for determining the coating amount so that the coating amount of the adhesive at a position corresponding to the distance increases as the distance increases, and the coating amount determination step. An adhesive application step of applying the adhesive by controlling at least one of a relative rotation speed between the nozzle for discharging the adhesive and the lens barrel and an application speed of the adhesive based on the determined application amount It is characterized by providing.

In the gap measurement step, the distance may be measured based on images of the optical element and the lens barrel.
In the adhesive application step, the lens barrel may be rotated around the central axis while changing the rotation speed while keeping the application speed of the adhesive constant.

  According to a second aspect of the present invention, there is provided an optical element fixing method for fixing an optical element disposed in a lens barrel to the lens barrel using an adhesive, the nozzle for discharging the adhesive, and the optical A gap measuring unit that measures the distance between the periphery of the element and the inner surface of the lens barrel, and an application that determines the application amount so that the application amount of the adhesive at a position corresponding to the distance increases as the distance increases An amount determination unit; and a control unit that controls at least one of a relative rotation speed of the nozzle and the lens barrel and an application rate of the adhesive based on the application amount determined by the application amount determination unit. It is characterized by that.

  According to the optical element fixing method and the optical element fixing device of the present invention, the optical element can be suitably fixed even if it is not arranged coaxially with respect to the lens barrel.

It is a figure which shows schematic structure of the optical element fixing device of 1st embodiment of this invention. It is a top view which shows a lens-barrel and the arrange | positioned lens. It is sectional drawing which shows a lens-barrel and the arrange | positioned lens. It is a flowchart which shows the flow of the optical element fixing method of this embodiment using the same optical element fixing apparatus. It is a figure which shows an example of a rotation speed setting graph. It is a graph which shows transition of adhesive application amount corresponding to the same rotation speed setting graph. It is a top view which shows the lens-barrel used in the optical element fixing method of 2nd embodiment of this invention, and the lens arrange | positioned. It is a flowchart which shows the flow of the optical element fixing method.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing a schematic configuration of an optical element fixing device (hereinafter simply referred to as “fixing device”) 1 of the present embodiment. The fixing device 1 fixes the lens (optical element) 100 to the lens barrel 110 using an adhesive by the optical element fixing method (hereinafter simply referred to as “fixing method”) of the present invention. The rotation stage 10 to which 110 is fixed, the camera 20 provided above the rotation stage 10 and the nozzle part 30 for discharging the adhesive, and the control unit 40 for controlling the operation of each part of the fixing device 1 are provided. .

  The rotary stage 10 has a known configuration including a chuck 11 for fixing the lens barrel 110, a drive mechanism such as a motor (not shown), and an encoder. The rotary stage 10 can fix the lens barrel 110 coaxially with the rotation axis of the rotary stage 10 by the chuck 11. The rotation speed of the rotary stage 10 can be adjusted within a predetermined range by the control unit 40 controlling the drive mechanism. Further, since the rotary stage 10 includes an encoder, the rotational position of the lens barrel 110 and the arranged lens 100 can be detected.

The camera 20 and the nozzle unit 30 are attached to an XYZ axis robot 2 positioned above the rotation stage 10, and move relative to the rotation stage 10 and the fixed lens barrel 110 when the XYZ axis robot 2 moves. Is possible. The XYZ axis robot 2 includes a known drive mechanism such as a motor, and the moving speed of the XYZ axis robot 2 can be adjusted within a predetermined range by the control unit 40.
The camera 20 can be held in a distance relationship from which the entire image of the lens barrel 110 and the lens 100 arranged in the lens barrel can be acquired from above the lens barrel 110. The camera 20 includes an image sensor such as a CCD, and the acquired image signal is sent to the control unit 40.

The nozzle unit 30 includes a nozzle 31 and includes a container 32 filled with an adhesive Ad and a dispenser 33 that supplies compressed air to the container 32. The container 32 and the dispenser 33 are connected by a tube 34, and the adhesive Ad is discharged from the nozzle 31 when compressed air is supplied into the container 32. The dispenser 33 is connected to the control unit 40, and the control unit 40 controls the supply pressure of the compressed air in the dispenser 33, whereby the adhesive Ad application speed (discharge of the adhesive Ad from the nozzle 31 per unit time is discharged). Amount) can be controlled. However, in the fixing method of this embodiment described later, the supply pressure of the compressed air by the dispenser 33 is constant, and the adhesive Ad is always discharged at a constant application speed (reference application speed).
The type of the adhesive Ad is not particularly limited, and various types such as UV curable and two-component can be appropriately selected in consideration of the material of the optical element and the lens barrel.

  As shown in FIGS. 2 and 3, the lens barrel 110 to which the lens 100 is bonded is formed in a substantially cylindrical shape, and has an inner diameter slightly larger than the outer diameter of the lens 100. A receiving portion 111 is provided on the inner surface of the lens barrel 110 so as to protrude into the inner cavity over the entire circumference. The inner diameter of the receiving portion 111 is set to be smaller than the outer diameter of the lens 100 and larger than the effective diameter of the lens 100, and the adhesive Ad in a state where the lens 100 is placed on the receiving portion 111. By this, the lens barrel 110 is fixed. In the present embodiment, the lens 100 and the lens barrel 110 are optical units that are attached to, for example, the distal end of the endoscope apparatus, and the lens 100 has an entire circumference so that watertightness is ensured on the bonding surface with the lens barrel 110. And fixed with an adhesive Ad.

The fixing method of this embodiment using the fixing device 1 configured as described above will be described.
FIG. 4 is a flowchart showing the flow of the fixing method of the present embodiment using the fixing device 1. In this fixing method, the gap measuring step S20 for obtaining the distance between the periphery of the lens 100 arranged in the lens barrel 110 and the inner surface of the lens barrel 110, and the measurement result in the gap measuring step, the lens 100 of the adhesive Ad. A coating amount determination step S30 for determining a coating amount for each phase position, and an adhesive for applying the adhesive Ad while rotating the rotary stage 10 at a predetermined speed based on the coating amount determined in the coating amount determination step. Agent coating process S40.

  First, in step S <b> 10, the user places the lens 100 on the receiving portion 111 of the lens barrel 110 and places the chuck 11 so that the rotation axis of the rotary stage 10 and the center axis of the lens barrel 110 are coaxial. To fix the rotating stage 10.

  In the gap measuring step in step S20, the user drives the xyz-axis robot 2 via the control unit 40, and the camera 20 is positioned above the lens 100 and the distance between the periphery of the lens 100 and the inner surface of the lens barrel 110 ( Move to a position where the gap can be photographed over the entire circumference. Then, the camera 20 is operated via the control unit 40, and the lens 100 and the lens barrel 110 are photographed to acquire an image. The acquired image signals of the lens 100 and the lens barrel 110 are sent to the control unit 40, and the distance between the periphery of the lens 100 and the inner surface of the lens barrel 110 is obtained over the entire circumference of the lens 100 based on the image.

Although there is no restriction | limiting in particular in the measuring method of a clearance gap, The following methods are mentioned as an example.
For example, in the image acquired by the camera 20, the center axis X1 of the lens 100 and the center axis X2 of the lens barrel 110 are detected as shown in FIG. The extending direction of the straight line L1 passing through both the central axes X1 and X2 is a shift direction, and the gap G is maximum and minimum at two points P1 and P2 on the periphery of the lens 100 intersecting the straight line L1. As a result, the phase position P1 and the maximum value G _{max of} the gap, and the phase position P2 and the minimum value G _{min of the} gap are specified. Then, the gap value at each phase position is calculated on the assumption that the gap value changes approximately proportionally between the maximum value G _max and the minimum value G _min between the two points. Thereby, the distance between the periphery of the lens 100 and the inner surface of the lens barrel 110 can be obtained over the entire circumference.
When the measurement of the gap by the control unit 40 is completed, the control unit 40 stores the gap value at each phase position, and associates the positions of the phase positions P1 and P2 with the encoder of the rotary stage 10. Thereafter, the process proceeds to step S30.

In the subsequent coating amount determination step in step S30, the coating amount of the adhesive Ad at each phase position of the lens 100 is determined. The amount of application is determined so that it is maximized at the phase position P1 where the value of the gap G is the maximum value _Gmax and is minimized at the phase position P2 where the value is the minimum value _Gmin. It is determined by the coating speed of Ad and the rotational speed of the rotary stage.

Although there is no restriction | limiting in particular in the determination method of an application quantity, The following methods are mentioned as an example.
First, based on the design values of the lens barrel 110 and the lens 100, the reference gap value, which is the gap value when both are arranged coaxially, and both are fixed while maintaining watertightness in a state where they are arranged coaxially. Therefore, a reference application amount necessary for this is calculated in advance and stored in the control unit 40. Then, at each phase position, the ratio between the reference gap value and the gap G is obtained, and by multiplying the reference application amount, the application amount of the adhesive Ad at the phase position can be obtained. Also in this case, similarly to the above-described step S20, the coating amount at the phase position P1 and the phase position P2 is calculated, and the coating amount at each phase position is assumed to change approximately proportionally between the two points. The amount may be calculated.

In this embodiment, since the application speed of the adhesive Ad from the nozzle 31 is constant, the control unit 40 determines the rotation speed of the rotary stage 10 at each phase of the lens 100 after the application amount at each phase position is determined. To decide.
For example, first, the rotational speed of the rotary stage 10 at the phase positions P1 and P2 is determined based on the application amount at each phase position. Thereafter, as shown in FIG. 5, the rotation stage has an initial speed V _min at the phase position P1 and a maximum speed V _{max at the} phase position P2, and the rotation speed changes approximately proportionally during that time. By creating a rotation speed setting graph including a run until 10 reaches the initial speed V _min , the rotation speed of the rotation stage 10 in each phase of the lens 100 can be determined.
The rotation speed setting graph is created so that the application of the adhesive Ad is started from the phase position P1, and the application is finished when the lens barrel 110 rotates once and returns to the phase position P1 again. The application amount of the adhesive Ad at each phase position corresponding to the rotation speed setting graph shown in FIG. 5 is as shown in the graph of FIG.
When the rotation speed at each phase position is determined, the process proceeds to step S40.

In the adhesive application process of step S40, the control unit 40 rotates the rotary stage 10 and rotates the held lens barrel 110 around the central axis X2. Rotational speed of the lens barrel 110 reaches the initial speed _{V min,} holding the speed. Then, as shown in FIG. 3, the dispenser 33 is actuated to start the discharge of the adhesive Ad from the nozzle 31 from the point of time when the encoder of the rotary stage 10 confirms that the phase position P1 is located immediately below the nozzle 31. .
Thereafter, the control unit 40 controls the rotation speed of the lens barrel 110 via the drive mechanism and the rotation stage 10 based on the rotation speed setting graph created in step S30, and the nozzle 31 of the adhesive Ad at the reference application speed. Discharge from. The control unit 40 stops the operation of the dispenser 33 when the lens barrel 110 makes one rotation after starting the discharge of the adhesive Ad, stops the discharge of the adhesive Ad, and stops the driving mechanism of the rotary stage 10. .

  As described above, the series of operations is completed, and the adhesive Ad is applied so as to keep the water tightness around the entire periphery of the lens 100, and the lens 100 is suitably fixed to the lens barrel 110. The rotary stage 10 rotates for a while after the drive mechanism stops, but eventually stops.

According to the fixing method of the present embodiment, the gap between the periphery of the lens 100 arranged in the lens barrel 110 and the inner surface of the lens barrel 110 is measured in the gap measuring step S20, and the measurement result is obtained in the coating amount determining step S30. Based on the above, the application amount of the adhesive Ad is appropriately determined in accordance with the gap at each phase position of the lens 100.
Therefore, in the adhesive application step S40, the optimum amount of the adhesive Ad is applied in accordance with the size of the gap with the lens barrel 110 at each phase position on the periphery of the lens 100. As a result, as shown by the broken line in FIG. 6, the amount of the adhesive becomes excessive or insufficient depending on the phase position as compared with the case where the adhesive is applied in a constant amount (for example, the reference application amount) over the entire circumference. Can be suppressed. This contributes to reducing labor and time for repairs in the post-process due to the occurrence of defective products due to excess or shortage of adhesive, and to suppress an increase in product yield.

  In addition, by using the fixing device 1 of the present embodiment provided with the camera 20, the gap is measured based on the images of the lens 100 and the lens barrel 110 in the gap measurement step S20. For this reason, it is not necessary to rotate the rotary stage 10 in order to obtain the clearance of the lens 100 over the entire circumference, and the clearance can be measured in a short time, and the working efficiency can be significantly shortened.

  Further, in the adhesive application step S40, the central axis 110 changes the rotational speed of the lens barrel 110 via the rotary stage 10 while maintaining the application speed of the adhesive Ad from the nozzle 31 of the nozzle unit 30 at the reference application speed. Since the adhesive Ad is applied by being rotated around, the amount of adhesive suitable for each phase position is controlled by controlling the relative rotational speed between the nozzle and the lens barrel with a simple control of changing only the rotational speed. Can be applied.

  The fixing device 1 of the present embodiment includes a nozzle 31 from which the adhesive Ad is discharged and a control unit 40, and the control unit 40 measures a distance between the peripheral edge of the optical element and the inner surface of the lens barrel. The measurement unit, the application amount determination unit that determines the application amount so that the application amount of the adhesive Ad at the position corresponding to the distance increases as the distance increases, and the nozzle 31 and the lens barrel based on the application amount It functions as a control unit that controls the relative rotation speed with 110. For this reason, the fixing method of this invention including the fixing method of this embodiment can be performed suitably.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the fixing device 1 is the same as that of the first embodiment, and only the shapes of the lens and the lens barrel used are different. In addition, in the following description, about the thing which is common in the content already demonstrated, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 7 is a plan view showing the lens 101 and the lens barrel 112 used in this embodiment. The shape of the lens 101 in plan view is a so-called D-cut shape in which a part of an arc is cut linearly, and the lumen shape of the lens barrel 112 is also a corresponding D-cut shape. Therefore, the periphery of the lens 101 has an arc portion 101A and a straight portion 101B, and the inner surface of the lens barrel 112 also has an arc portion 112A and a straight portion 112B.

  FIG. 8 is a flowchart showing the flow of the fixing method of the present embodiment using the fixing device 1. In the present embodiment, first, the adhesive Ad is applied so as to fix the arc portion 101A and the arc portion 112A, and then the adhesive Ad is applied so as to fix the straight portion 101B and the straight portion 112B.

First, in step S11, as in step S10, the lens 101 is disposed on a receiving portion (not shown) of the lens barrel 112.
In the subsequent gap measurement step of step S21, as in step S20, images of the lens 101 and the lens barrel 112 are acquired by the camera 20, and the value of the gap at each phase position of the arc portion 101A of the lens 101 is measured. However, in the present embodiment, unlike the first embodiment, the control unit 40 measures the value of the gap at each phase position independently, for example, by counting the number of pixels in the gap area in the acquired image.

  In the coating amount determination step of step S31, the control unit 40 calculates the coating amount of the adhesive Ad and the rotational speed of the rotary stage 10 at each phase position by the same method as in the first embodiment, and creates a rotational speed setting graph. To do. At this time, one of the two connection points P3 and P4 between the circular arc part 101A and the straight line part 101B is the application start position, the other is the application end position, and the other part of the circular arc part 101A is located therebetween. The rotational speed graph is configured as follows. Which of the connection points P3 and P4 is the application start position is determined by the rotation direction of the lens barrel 112. For example, when the lens barrel 112 is rotated clockwise in the plan view of FIG. 7, the connection point P4 is the application start position, and the connection point P3 is the application end position.

In the adhesive application process of step S41, the control unit 40 rotates the rotary stage 10 via the drive mechanism and maintains the initial speed _Vmin at the above-described application start position. Then, the dispenser 33 is actuated to start the discharge of the adhesive Ad from the time when the encoder confirms that the application start position is located immediately below the nozzle 31. Thereafter, the control unit 40 discharges the adhesive Ad at the reference application speed while controlling the rotational speed of the rotary stage 10 based on the rotational speed setting graph created in step S31. When the lens barrel 112 rotates and the application end position is located immediately below the nozzle 31, the control unit 40 stops the operation of the dispenser 33, ends the discharge of the adhesive Ad, and stops the driving mechanism of the rotary stage 10. To do.
This completes the fixing of the arc portion 101A and the arc portion 112A, and the process proceeds to step S50.

In step S50, the straight portion 101B and the straight portion 112B are fixed.
First, the control unit 40 measures the gap between the lens 101 and the lens barrel 112 in the straight line portion by measuring the distance between the connection points P3 and P4 and the straight line portion 112B using the image acquired in step S21. . For the region between the connection points P3 and P4, the gap value is obtained by calculation on the assumption that the gap value changes proportionally, and is directly replaced with the measurement.

Next, the control unit 40 determines the application amount of the adhesive Ad at each position on the linear portion 101B and the moving speed of the nozzle 31 via the xyz-axis robot 2 by the same calculation as that for the arc portion 101A. The movement speed setting graph for fixing the straight portion is created so that one of the connection points P3 and P4 is the application start position and the other is the application end position.
In fixing the straight portion, any of the connection points P3 and P4 may be used as the application start position, but the movement speed can be gradually increased by using the connection point with the larger gap as the application start position. Therefore, speed control is easy and preferable.

  After creating the moving speed setting graph, the control unit 40 moves the xyz-axis robot 2 so that the nozzle 31 comes to a predetermined position on the extension line of the linear portion 101B in plan view. The predetermined position is determined in consideration of a running distance required for the moving speed of the xyz-axis robot 2 to reach the initial speed set in the moving speed setting graph at the application start position.

Thereafter, the control unit 40 linearly moves the nozzle 31 along the linear portion toward the application end position via the xyz-axis robot 2, and when the application start position comes directly below the nozzle 31, the adhesive Ad is applied. To start. Then, the adhesive Ad is discharged from the nozzle 31 at the reference application speed while changing the movement speed of the xyz-axis robot 2 based on the movement speed setting graph, and when the application end position comes directly below the nozzle 31, the adhesive Ad is discharged. Finish application. Step S50 is completed above.
When step S50 is completed, the fixing of the linear portion 101B and the linear portion 112B is completed, and the adhesive Ad is applied so as to keep watertight over the entire circumference of the lens 101, and the lens 101 is fixed to the lens barrel 112.

Also in the fixing method of the present embodiment, it is possible to suppress the occurrence of a situation in which the amount of adhesive becomes excessive or insufficient depending on the site, as in the first embodiment.
Further, by adding the process of step S50, the fixing method of the present invention can be suitably applied to the so-called D-cut optical element and the lens barrel so that the optical element can be fixed.

In the present embodiment, in the gap measurement step S21, similarly to step S20, a deviation between the center axis of the lens 101 (center of the arc portion 101A) and the center axis of the lens barrel 112 (center of the arc portion 112A) is used. The value of the gap at each phase position of the arc portion 101A may be obtained. However, it should be noted that when the straight line connecting both the central axes intersects the straight line portion 101B, any one of the phase positions P1 and P2 at which the gap G is minimum and maximum does not exist on the arc portion 101A.
In step S50, the step of measuring the gap between the lens 101 and the lens barrel 112 in the linear portion, and the step of determining the application amount of the adhesive Ad and the moving speed of the xyz-axis robot 2 at each position of the linear portion are: In steps S21 and S31, it may be performed together with the measurement and determination in the arc portion.

The embodiments of the present invention have been described above. However, the technical scope of the present invention is not limited to the above-described embodiments, and combinations of components in the embodiments may be changed without departing from the spirit of the present invention. Various changes can be added to or deleted from each component.
For example, in each of the above-described embodiments, the example in which the adhesive application amount at each phase position is changed by changing the rotation speed of the lens barrel while keeping the application speed of the adhesive from the nozzle constant. Instead, the adhesive application amount at each phase position may be changed by changing the application speed of the adhesive from the nozzle by controlling the dispenser or the like while keeping the rotation speed of the lens barrel constant. Furthermore, you may change both the application | coating speed | velocity | rate of the adhesive agent from a nozzle, and relative rotation speeds, such as a nozzle and a lens-barrel.

  In each of the above-described embodiments, an example in which an image of the lens and the lens barrel is acquired and the gap measurement step is executed based on the image has been described. Instead, the gap is measured using a laser displacement meter or the like. Measurements may be made. In this case, for example, the gap is measured over the entire circumference by scanning the periphery of the lens with a laser displacement meter while rotating the lens barrel around the central axis.

  Furthermore, the fixing method and fixing device of the present invention are not limited to those in which an adhesive is applied over the entire periphery of the optical element so as to maintain watertightness. For example, the optical element may be fixed to the lens barrel at a plurality of spots at the peripheral edge by intermittently discharging the adhesive. In this case, fixing may be performed by determining the amount of adhesive applied to each of the plurality of spots and changing the rotational speed of the lens barrel or the speed of applying the adhesive from the nozzles accordingly.

  In addition, the fixing method and fixing device of the present invention may be applied to optical elements other than lenses. For example, it can be suitably applied to a flat cover glass or the like in which at least a part of the periphery is formed in an arc shape.

DESCRIPTION OF SYMBOLS 1 Optical element fixing device 31 Nozzle 40 Control unit (gap measurement part, coating amount determination part. Control part)
100, 101 Lens (optical element)
110, 112 Lens barrel Ad Adhesive S20, S21 Gap measuring step S30, S31 Application amount determining step S40, S41 Adhesive application step

Claims (4)

An optical element fixing method for fixing an optical element arranged in a lens barrel to the lens barrel using an adhesive,
A gap measuring step for obtaining a distance between a peripheral edge of the optical element and an inner surface of the barrel;
A coating amount determination step of determining the coating amount so that the coating amount of the adhesive at a position corresponding to the distance increases as the distance increases;
Based on the coating amount determined in the coating amount determination step, the adhesive is controlled by controlling at least one of a relative rotation speed between the nozzle for discharging the adhesive and the lens barrel and a coating speed of the adhesive. An adhesive application process to be applied;
An optical element fixing method comprising the steps of:   The optical element fixing method according to claim 1, wherein in the gap measurement step, the distance is measured based on images of the optical element and the lens barrel.   3. The optical element according to claim 1, wherein in the adhesive application step, the lens barrel is rotated around a central axis while changing a rotation speed while maintaining a constant application speed of the adhesive. 4. Fixing method. An optical element fixing method for fixing an optical element arranged in a lens barrel to the lens barrel using an adhesive,
A nozzle from which the adhesive is discharged;
A gap measuring unit for measuring a distance between a peripheral edge of the optical element and an inner surface of the lens barrel;
A coating amount determination unit that determines the coating amount so that the coating amount of the adhesive at a position corresponding to the distance increases as the distance increases;
A control unit for controlling at least one of a relative rotation speed of the nozzle and the lens barrel and a coating speed of the adhesive based on the coating amount determined by the coating amount determination unit;
An optical element fixing device comprising:

Images