JP2001027723A - Method for sticking and fixing optical part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for sticking and fixing an optical part by which the optical part is stuck and fixed and by which eccentricity is adjusted at high speed and high precision. SOLUTION: In this sticking and fixing method, a sticking part 102 which is positioned on the outside of the position adjusting range 103 of the outer peripheral part of an optical part 3 and an adhesive coating part 100 which is connected to the sticking part 102 and moreover protrudes to the outside of the sticking part are provided in the object 9 which is to be fixed and to which the optical part 3 is fixed. An adhesive is delivered to the adhesive coating part 100 after adjusting the position of the optical part 3, whereby the optical part 3 is stuck and fixed to the object 9 to be fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding and fixing an optical component such as a lens for adjusting the position of the optical component and bonding the same.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for compact optical elements such as a camera lens and an 8 mm video lens, and an aspherical lens has been frequently used.
In such an aspherical lens, the amount of eccentricity of one lens must be kept within several microns, and it is impossible to guarantee optical performance only by processing accuracy of parts (lens tube, lens). Axis adjustment is required.

FIG. 19 is a side view of a conventional optical axis adjusting device of a lens system.

As shown in FIG. 19, when four single crystal lenses 206, 205, 204, and 203 are attached to a lens barrel 209, for example, each single crystal lens 206, 205, 204, and 2 is attached.
It is necessary to make the optical axes of 03 coincide. In particular, in the case of a camera lens for a new photographic system, it is necessary to align the optical axis of the lens coaxially within a few microns.

In FIG. 19, a resolution chart 202 in the XY orthogonal direction is provided below a light source, and a chart image is formed by a CCD camera 208 by a target lens system to be adjusted.
Imaged on top. Here, it is assumed that the target lens system is being assembled, and the lenses 206, 205, and 204 are fixed to the lens barrel, but the lens 203 is not yet fixed.

When the chart image passes through the lens system, if the optical axes of the lens systems 206, 205, and 204 and the lens 203 coincide, the chart image on the camera monitor is resolved and observed. On the other hand, when the chart image is observed without being resolved, the lens 203 is moved so that the chart image is resolved.
Is finely adjusted in the X and Y directions.
An adhesive is manually applied and fixed to several places on the outer periphery of 03. Since the position of the lens 3 is adjusted, the position of the lens is not constant, so that the adhesive is applied by hand while visually confirming the adhesive application position in order to securely adhere and fix. FIG. 20 shows a lens to which an adhesive has been applied by a conventional method.
20A is a top view and FIG. 20B is a side sectional view.

[0007]

In such a conventional adjustment method, fine adjustment is performed while a person visually observes the chart image. Therefore, skill is required to determine the resolution, and the productivity is lacking. Results also vary from person to person. For this reason, it is difficult to determine the deviation of the optical axis of 5 microns or less, and a determination error due to fatigue or the like occurs, resulting in poor reliability.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method for bonding and fixing an optical component by adjusting eccentricity at high speed and with high accuracy. It is to provide.

[0009]

Means for Solving the Problems To solve the above-mentioned problems,
In order to achieve the object, a method for bonding and fixing an optical component according to the present invention includes the steps of: bonding a bonding object located outside a position adjustment range of an outer peripheral portion of the optical component to a fixing target for fixing the optical component; An adhesive application part connected to the part and protruding outward from the adhesive part, and discharging the adhesive to the adhesive application part after adjusting the position of the optical component, thereby fixing the optical component to the fixing object. It is characterized by being fixedly adhered to objects.

Further, in the method for bonding and fixing an optical component according to the present invention, the adhesive application section is provided with an inclination in a direction of descending toward an outer peripheral portion of the optical component.

In the method for bonding and fixing an optical component according to the present invention, the adhesive is an ultraviolet-curable adhesive.

In the method for bonding and fixing an optical component according to the present invention, the optical component is a lens, and the bonding portion and the adhesive application portion equally divide the circumference of the outer periphery of the lens. It is characterized by being provided in a place.

Further, in the method for bonding and fixing an optical component according to the present invention, the optical component has a square planar shape, and the bonding portion and the adhesive application portion are located outside the opposite sides of the square. It is characterized by being provided in.

In the method of bonding and fixing an optical component according to the present invention, the position adjustment of the optical component is performed by image processing a chart image formed by passing through the optical component. I have.

In the method of bonding and fixing an optical component according to the present invention, the shift amount and the shift direction of the optical component are detected by detecting the position of the center of gravity of the chart image by the image processing. .

In the method of bonding and fixing an optical component according to the present invention, the position of the center of gravity of four identical chart images formed by the optical component is detected, and the deviation of the optical component is determined based on the average value. And a deviation direction is detected.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing a lens barrel used in an embodiment of the method for bonding and fixing an optical component according to the present invention.

In FIG. 1, reference numeral 9 denotes a lens barrel for supporting and bonding the lens 3 as an optical component, 100 denotes an adhesive applying section for applying an adhesive, and 101 denotes an adhesive applying section.
In the figure, 102 is an adhesive portion, 103 is an adjustment allowance for adjusting the lens 3, and a gap between the lens 3 and the outer peripheral portion is about 0.
It is about 1 to 0.3 mm. 104 is an adjusting finger 2
This is an escape for 1.

Next, the steps of adjusting the optical axis of the lens and the step of bonding and fixing using the lens barrel 9 as described above will be described.

In FIG. 11, reference numeral 12 denotes a chart projection unit in which a projection lens 1 and a chart 2 are installed below a light source 10. The chart 2 has a chart moving mechanism 13 movable in the optical axis direction by a motor (not shown).
Is moved in the optical axis direction as needed, and the focus is adjusted. The chart image projected by the projection unit is formed by the adjusted lenses 3, 4, 5, and 6. The lenses 4, 5, and 6 are lenses already fixed to the lens barrel 9, and the lens 3 is a lens whose optical axis is adjusted.

By lowering the Z stage 20, the lens 3 is pressed by the adjustment finger 21 of the adjustment arm 19 from three directions above the periphery of the lens toward the lens barrel 9 below, and in the XY directions perpendicular to the optical axis. The edge of the lens is held at an oblique angle so that it can be moved by the XY fine movement stage 14. The lens barrel is fixed to the gantry 18. A collimator lens 7 is provided below the lens to be adjusted, and forms a chart image on a sensor 8 provided further below. The sensor 8 uses a CCD camera.

The camera control section 17 supplies a power supply, a clock, and the like for the sensor 8, and supplies a signal of a chart image converted in time series to the image processing apparatus 16. The image processing device 16 calculates a coma flare amount from a chart image converted into a time-series signal as described later. 23 is a UV adhesive application unit, 11 is an ultraviolet irradiation unit, and after the optical axis adjustment, the chart projection unit 12 is retracted from the optical axis, and
The adhesive application unit 23 and the ultraviolet irradiation unit 11 move on the optical axis. Then, the lens 3 is fixed by applying an adhesive and irradiating ultraviolet rays to cure the adhesive.

The XY fine movement stage 14 finely moves the finger 21 in the XY directions by an X-axis and Y-axis motor (not shown) according to an instruction from the control device 15. The control device 15 measures the amount of coma flare via the image processing device 16 and thereby moves the XY fine movement stage 14. By repeating this, the optical axis of the lens 3 can be adjusted to the optical axes of the lenses 4, 5, and 6. Then, as described above,
The adhesive application unit 23 and the ultraviolet irradiation unit 11 are moved right above the lens system, an adhesive is applied, and the lens 3 is fixed by ultraviolet irradiation.

FIG. 2 is a diagram showing a chart in the present embodiment. Chart 2 has a circular transparent portion 31a,
31b, 31c and 31d, which show the bright parts of the chart to be projected and the other parts are dark parts which do not transmit light.

FIG. 3 is a view showing a chart image including a coma flare component formed on the sensor 8. The chart image is taken into the image processing device 16 via the camera control unit 17, and when the illuminance distribution in the cross section 42a is calculated therein, a value as shown in FIG. 4 is obtained. Cross sections 42b, 42c, 42
Similarly, the value of the illuminance distribution is obtained for d.

FIG. 4 shows the illuminance distribution at the cross section 42a. First, a maximum luminance point (shown by a white circle) is searched from the illuminance distribution. Next, a slice level large value is calculated by a predetermined method, for example, a maximum luminance value × 0.9. This is set as a slice level H. Next, a small slice level value is calculated using, for example, the maximum luminance value × 0.1. This is defined as slice level L. As a method of finding the maximum luminance point, a mask may be provided in a sandwiched range including the chart image 41a, and the maximum luminance point in the area may be found.

FIG. 5 shows a processed image when the chart image 41a is binarized at the slice level H and the slice level L. Here, the position of the center of gravity of each binarized image is obtained. The barycentric position X = Σ (xi × li) / に よ り li The barycentric position Y = Σ (yi × Li) / ΣLi, the barycentric position (x1, y1) of the binarized image at the slice level H and the slice level L Of the center of gravity of the binarized image (X1, Y1).

FIG. 6 shows the binarized images 43a, 43b, 43c, 43d at the slice level H of the chart image and the respective barycentric positions (xa, ya)... (Xd, yd). FIG. 7 shows the binarized images 44a, 44b, 44c, 44d and the respective barycentric positions (Xa, Ya)... (Xd, Yd) at the slice level L of the chart image.

FIG. 8 shows the direction of eccentricity and the amount of centering. The eccentric direction of the chart image 42a is (Xa, Ya) → (x
a, ya) and the amount of eccentricity is √ ｛(xa−Xa) ² + (ya)
−Ya) ² }. Other chart images 42b, 42c,
Similarly, the respective eccentric directions and amounts of eccentricity are obtained for 42d. In this embodiment, since four pie charts are used, the actual eccentric direction and the eccentric amount are the average values of the four eccentric charts. Compared to the case where one pie chart is used, averaging using a plurality of pie charts improves accuracy, but of course, it may be obtained using one pie chart.

FIG. 9 shows a case where the optical axis of the lens 3 to be adjusted and the other lens coincide with each other. When the optical axes coincide, the coma flare component is not included in the chart image, and therefore, the barycenter position (xa, y) of the binarized image at the slice level H
a) and the barycenter position (Xa, Ya) of the binarized image at the slice level L match.

Next, the procedure of optical axis adjustment will be described with reference to the flowchart of FIG.

First, in step 1, the parameters used for the calculation are initialized, and the mechanism is set to the initial position. step
Set the object to be adjusted (lens system) in 2 and set X in step 3.
By moving the Y fine movement stage 14, the adjustment finger 21 is moved to a predetermined position. Then, the Z stage 20 is lowered and the lens 3 is pressed and gripped as described above, and the lens 3 is positioned substantially at the center of the adjustment margin.

In step 4, the chart projection unit 12 is moved on the optical axis. By moving the chart 2 by the focus adjustment mechanism 13 in step 5, the peak illuminance of the chart image captured by the sensor 8 is measured, and the chart 2 is stopped at the position of the illuminance peak.

In step 6, the slice levels H and L for the illuminance peak shown in FIG. 4 are calculated. The image captured by the sensor 8 in step 7 is binarized at the slice level H shown in FIG. 6, and the barycentric position (xa, ya) of the image at that time is obtained.
Measure (xd, yd).

Similarly, at step 8, the image captured by the sensor 8 is binarized at the slice level L shown in FIG. 7, and the barycentric positions (Xa, Ya)... (Xd, Yd) of the image at that time are measured. Then, in step 9, the eccentric direction and the eccentric amount are measured.

The eccentric direction of the chart image 41a is (Xa,
Ya) → (xa, ya), θa = tan ⁻¹ {(xa−Xa) / (ya−Ya)} The amount of eccentricity is Ra = {(xa−Xa) ² + (ya−Y)
a) It becomes ² ｝.

Similarly, chart images 41b, 41c, 41d
The eccentric amounts Rb... Rd and the eccentric directions θb.

Next, in step 10, the four eccentric amounts are averaged, and if the values are within the standard, the movement of the lens 3 ends. If it is out of the standard, the four eccentric directions are averaged in step 11, and the lens 3 is moved by the XY fine movement stage 14 in that direction by the average of the eccentric amounts. Then ste
Returning to p5, similarly, the adjustment is repeated until the eccentricity falls within the standard.

When the adjustment is completed, the chart projection unit 12 is retracted in step 12, the adhesive application unit 23 moves on the optical axis in step 13, and the adhesive is discharged to the adhesive application unit 100.

FIGS. 13 and 14 are views showing the positional relationship between the needle 22 for applying the adhesive and the finger 21.

Fingers 21 are provided at three places on the circumference, and needles are provided at three places on the circumference between them. this,
This will be described in more detail with reference to FIG.

FIG. 15A shows the needle 22 of the adhesive application unit 23, and 150 is an adhesive. FIG.
The adhesive 150 discharged from the needle 22 in (b) is dropped on the inclined portion 101 of the adhesive application section 100. Since the adhesive application section 100 that is sufficiently larger than the size of the adhesive droplet is provided, and the adhesive application section 100 does not move from the original position even if the lens 3 moves for adjustment, the adhesive 150 can be dropped.

In FIG. 15C, the dropped adhesive 150 flows into the lens end 24 by the inclined portion 101. When the adhesive 150 reaches the lens end 24 in FIG. 15D, the adhesive 150 also flows along the lens end 24 into the bonding portion 102 (see FIG. 14).

The viscosity of the adhesive used here is 100
Since it is 00 to 15000 cp, if the amount of the adhesive discharged is an appropriate amount, it does not flow into the adjustment allowance 103 and the adhesive portion 102 is sufficiently filled. Also, if the viscosity of the adhesive used is low, it is possible to narrow the gap between the adhesive portions 102, and if it flows into the adjustment allowance 103, it can be cured by irradiating ultraviolet rays, so the problem is Absent.

Next, in step 14, the ultraviolet irradiation unit 1
1 moves on the optical axis, and irradiates the adhesive applied around the lens 3 with ultraviolet rays in step 15 to fix the lens 3.

In step 16, the Z stage 20 moves up to unclam the lens 3, and the XY fine movement stage 14 is retracted to a predetermined position. At step 17, the work (lens system) is removed, and the adjustment and bonding are completed.

FIG. 12 shows a completed product of this embodiment. FIG.
In FIG. 2A, reference numeral 150 (black portion) denotes an applied adhesive, and the adhesive is evenly applied to three bonding portions on the outer periphery of the lens. If the adhesive portion 102 is not provided, the adhesive is not always uniformly applied to the adhesive application portion 100, so that the adhesive force greatly varies. FIG.
FIG. 12B shows a side cross section of FIG.

(Other Embodiment) FIGS. 16 and 17 show another embodiment. When the curvature of the lens (optical component) to be adjusted is small, the escape portion 104 is not required if a bell clamp method that presses the curvature portion is used as the adjustment finger. With such a configuration, the same effect as in the first embodiment can be obtained. Also, the optical component need not be circular but may be square, and the same applies. Both ends of the optical component 25 as shown in the plan view of FIG. 18A, or four optical components as shown in the plan view of FIG. An adhesive portion can be similarly formed on the two outer peripheral portions.

As described above, according to the above embodiment, the optical component can be securely and accurately adhered and fixed.

In the above embodiment, since the adhesive is applied to the bonding portion after the position of the lens is adjusted, the adhesive is applied before the position of the lens is adjusted. It is possible to prevent the adhesive from adhering to the effective portion.

Further, by changing the length of the bonding portion 102, the bonding force can be changed, and an appropriate bonding force can be stably obtained with a small amount of adhesive.

The present invention can be applied to a modification or a modification of the above embodiment without departing from the gist of the invention.

For example, in the above embodiment, the description has been made such that the adhesive portion and the adhesive application portion are provided at the three peripheral portions of the lens. However, the present invention is not limited to this. It may be provided at a plurality of locations other than the above.

In the above-described embodiment, the average value of the barycenter positions of the four chart images has been described. However, the number of the chart images is not limited to four, and may be an arbitrary number.

In the above embodiment, a lens was described as an example of an optical element. However, the present invention is not limited to a lens. Applicable.

[0057]

As described above, according to the present invention, an optical component can be securely and accurately adhered and fixed.

Further, the inclined portion is provided in the adhesive application portion so as to spatially spread in the direction of the adhesive portion, so that the discharged adhesive can easily flow into the adhesive portion due to the inclination, and the adhesive can be surely formed with less adhesive. Can be adhesively fixed.

In addition, since the adhesive is an ultraviolet-curing adhesive, there are many types of adhesives recently, and the viscosity and the like relating to workability are relatively easy to select, and since the curing time is short, the work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a lens barrel used in an embodiment of the present invention.

FIG. 2 is a diagram showing an optical chart used in one embodiment.

FIG. 3 is a diagram showing a chart image formed on a sensor.

FIG. 4 is a diagram showing an illuminance distribution of a chart image formed on a sensor.

FIG. 5 is a diagram illustrating the position of the center of gravity of a binarized image.

FIG. 6 is a diagram showing a binarized image at a slice level H;

FIG. 7 is a diagram showing a binarized image at a slice level L.

FIG. 8 is a diagram showing an eccentric amount and an eccentric direction.

FIG. 9 is a diagram showing a state when the optical axes of the lenses coincide (when the amount of eccentricity is 0).

FIG. 10 is a flowchart of software of the control device.

FIG. 11 is a diagram illustrating a configuration of an apparatus for performing position adjustment and bonding according to an embodiment.

FIG. 12 is a diagram showing a completed product in one embodiment.

FIG. 13 is a side sectional view showing a positional relationship between an adjustment finger and an adhesive application needle.

FIG. 14 is a top view showing a positional relationship between an adjustment finger and an adhesive application needle.

FIG. 15 is a diagram illustrating the flow of an adhesive.

FIG. 16 is a side sectional view of another embodiment.

FIG. 17 is a top view of another embodiment.

FIG. 18 is a top view of still another embodiment.

FIG. 19 is a diagram showing a configuration of a conventional position adjusting device.

FIG. 20 is a top view showing a conventional completed product.

[Explanation of symbols]

 3 Lens 9 Lens barrel 100 Adhesive application section 101 Slope section 102 Adhesion section 103 Adjustment allowance

Claims (8)

[Claims] 1. A bonding object located outside a position adjustment range of an outer peripheral portion of the optical component on a fixing object to which the optical component is fixed, and connected to the bonding portion and protruded outward from the bonding portion. Bonding the optical component to the fixing object by providing an adhesive application portion and discharging an adhesive to the adhesive application portion after adjusting the position of the optical component. Fixing method. 2. The method for bonding and fixing an optical component according to claim 1, wherein the adhesive application section is provided with an inclination in a direction of descending toward an outer peripheral portion of the optical component. 3. The method according to claim 1, wherein the adhesive is an ultraviolet curable adhesive. 4. The lens according to claim 1, wherein the optical component is a lens, and the adhesive portion and the adhesive application portion are provided at three positions equally dividing a circumference of an outer peripheral portion of the lens. Item 2. The method for bonding and fixing an optical component according to Item 1. 5. The optical device according to claim 1, wherein the optical component has a rectangular planar shape, and the adhesive portion and the adhesive application portion are provided outside opposing sides of the rectangular shape. 2. The method for bonding and fixing an optical component according to item 1. 6. The optical component according to claim 1, wherein the position adjustment of the optical component is performed by image processing of a chart image formed by passing through the optical component. Method. 7. The method according to claim 6, wherein a shift amount and a shift direction of the optical component are detected by detecting a center of gravity of the chart image by the image processing. . 8. The method according to claim 1, wherein a center of gravity of four identical chart images formed by the optical component is detected, and a shift amount and a shift direction of the optical component are detected based on an average value thereof. Item 8. The method for bonding and fixing an optical component according to Item 7.