JP6160483B2 - Optical system manufacturing method, lens barrel, optical apparatus, and imaging apparatus - Google Patents

Description

  The present invention relates to an optical system adjustment method for adjusting an optical system, an optical system adjustment device, and an image sensor adjustment method.

  A camera taking lens includes a plurality of lenses held by a holder (lens holder) and is incorporated in a lens barrel. In particular, in compact cameras, inexpensive and lightweight plastic lens holders are frequently used. Conventionally, optical characteristics of an optical system incorporated in a lens barrel are evaluated, and when the evaluation value is not within an allowable range, adjustment such as optical axis alignment of a lens is performed using an adjustment screw or the like.

  However, the work of adjusting the lens mounted in the lens barrel with the adjusting screw is a work that requires skill by operating the adjusting screw from the outside of the lens barrel, and it takes a lot of time and labor. is there. Similar problems occur when adjusting an image sensor attached to the camera body.

A first aspect of the present invention for solving the above-described problems includes a first arm portion having a first predetermined portion irradiated with laser light and provided in a direction crossing the optical axis of the lens. And a second arm portion having a second predetermined portion irradiated with laser light and provided in a direction crossing the direction of the optical axis of the lens and the direction in which the first arm portion is provided. Based on the assembly process of assembling the optical system by attaching the lens in the lens barrel and the evaluation result of the optical characteristics of the optical system using the image by the optical system, the first predetermined portion is irradiated with laser light. The direction of the optical axis of the lens is corrected by deforming the first arm portion, and the optical axis of the lens is modified by irradiating the second predetermined portion with laser light to deform the second arm portion. The lens in a direction along the plane intersecting It is a manufacturing method of an optical system having a correcting step for correcting the position.

According to a second aspect of the present invention, there is provided a lens provided in a lens barrel, and a first groove formed along the first direction by irradiation with a laser beam that changes a direction of an optical axis of the lens. A first arm provided in a direction intersecting a direction parallel to the optical axis of the lens, and a position of the lens being changed in a direction along a plane intersecting the optical axis of the lens. A second groove formed by laser light irradiation has a second region provided along a second direction, and intersects the direction parallel to the optical axis of the lens and the direction provided with the first arm. It is a lens barrel having a second arm provided in the direction.

According to a third aspect of the present invention, there is provided an imaging unit having an imaging surface, and a first region in which a first groove formed by irradiation of a laser beam that changes a direction of the imaging surface is provided along the first direction. A first arm provided in a direction intersecting with the direction orthogonal to the imaging surface, and a laser beam for changing the position of the imaging unit in a direction along a surface intersecting the direction orthogonal to the imaging surface The second groove formed by the irradiation of has a second region provided along the second direction, and is provided in a direction orthogonal to the imaging surface and a direction intersecting the direction provided with the first arm. An imaging device having a second arm.

  According to a sixteenth aspect of the present invention, there is provided a method for adjusting an image sensor, the attaching step of attaching a holder made of a plastic molding member that holds the image sensor to the camera body, the image sensor and an image of a predetermined pattern, An optical system is arranged between the image sensor to capture a predetermined pattern, and an evaluation process for evaluating the imaging characteristics of the image sensor based on the pattern image formed by the image sensor, and holding based on the evaluation result of the evaluation process And a correcting step of correcting the shape of the holder by irradiating a predetermined part of the tool with laser light.

  According to the adjustment method and adjustment apparatus of the optical system of the present invention, optical characteristics are evaluated in a state where an optical system including an optical component held by a holder made of a plastic molding member is incorporated in a lens barrel, and the evaluation is performed. Since the shape of the holder is corrected by irradiating a predetermined portion of the holder with the laser beam based on the result, the optical system can be easily adjusted.

FIG. 1 is a block diagram schematically showing an optical system adjusting apparatus according to an embodiment of the present invention. FIG. 2A is a diagram schematically illustrating a test chart used for adjustment of the optical system, and FIG. 2B is a diagram schematically illustrating an image of the test chart formed by the optical system. . FIG. 3 is a side view schematically showing a lens holder irradiated with laser light in the first embodiment, FIG. 3A is a lens holder before laser light irradiation, and FIG. 3B is laser light. It is a lens holder after irradiation. FIGS. 4A and 4B are schematic views showing an example of formation of engraving lines by irradiating a lens holder with laser light. FIG. 4A is a plan view, and FIG. 4B is a cross-sectional view taken along line AA. FIG. 5 is a partial cross-sectional view schematically showing the internal stress distribution before and after the laser beam irradiation to the lens holder, FIG. 5A is a diagram showing the internal stress distribution before the laser beam irradiation, and FIG. These are figures which show internal stress distribution after laser beam irradiation. FIG. 6 is a diagram schematically showing the inside of the digital camera in which the lens barrel shown in FIG. 1 is housed. FIG. 7 is a perspective view schematically showing a lens holder irradiated with laser light in the second embodiment. FIG. 8 is a flowchart showing an optical system adjustment method according to an embodiment of the present invention. FIG. 9 is a diagram schematically showing the adjustment of the image sensor according to the embodiment of the present invention.

Hereinafter, the configuration of an optical system adjustment method (hereinafter referred to as an adjustment method) and an optical system adjustment device (hereinafter referred to as an adjustment device) according to an embodiment of the present invention will be described with reference to the drawings.
-1st Embodiment (adjustment apparatus)-

  As shown in FIG. 1, the adjusting device 1 is for adjusting an optical system 20 of a photographing lens barrel for a camera, a support base 2 on which the lens barrel 10 is mounted and fixedly supported, and an imaging device. 3, an evaluation device 4, an irradiation control device 5, and a laser marker 6 as laser light irradiation means.

  The imaging device has an imaging surface inside, and the image of the test chart 7 is formed on the imaging surface by the optical system 20 instructed to fix to the support base 2. The imaging device generates image data from the formed image.

  The evaluation device 4 calculates evaluation data related to the tilt amount and shift amount of the optical system 20 based on the comparison between the image data and the reference image data.

  The irradiation control device 5 calculates the irradiation condition of the laser beam irradiated by the laser marker 6 based on the evaluation data calculated by the evaluation device 4, and controls the laser marker 6 so that the laser beam is irradiated under the irradiation condition. That is, a laser beam irradiation condition for tilt correction for correcting the tilt amount and a laser beam irradiation condition for shift correction for correcting the shift amount are respectively set, and laser light is irradiated under these irradiation conditions. Thus, the laser marker 6 is controlled.

  The laser light irradiation conditions are values regarding, for example, the output value of the laser light, the irradiation range, the number of irradiations, the irradiation time, and the duty ratio when performing pulse irradiation. The relationship between the values of these items and the tilt amount and shift amount to be corrected is prepared in the adjustment device as a laser light irradiation condition table.

The laser marker 6 is, for example, a carbon dioxide laser (CO ₂ laser), and irradiates a predetermined portion 121 of the first lens holder 12 with laser light L 1 based on control by the irradiation control device 5. The laser marker 6 can move in the vertical and horizontal directions within a plane perpendicular to the optical axis of the optical system 20.

Next, an adjustment method using the adjustment device 1 will be described with reference to FIGS. 1 and 8.
-Second Embodiment (Adjustment Method)-

  The lens barrel 10 to be adjusted includes a first lens holder 12 that holds the first lens 11, a second lens holder 22 that holds the second lens 21, and a third lens. A third lens holder 32 holding 31 is housed. The first, second, and third lenses 11, 21, and 31 constitute the photographing optical system 20. In FIG. 1, for the sake of simplicity, the optical system 20 is shown with only three convex lenses 11, 21 and 31, and the other lenses are not shown.

  The first, second, and third lens holders 12, 22, and 32 are all plastic molded products that are injection molded by an injection molding machine. Each of these lens holders 12, 22, and 32 has a vertically long plate shape, one end of which holds the first, second, and third lenses 11, 21, and 31, and the other end of the lens barrel 10. It can be attached to the circumference.

  The lenses 11, 21, and 31 are attached to the lens holders 12, 22, and 32, respectively (step S1). Next, the lens holders 12, 22, and 32 are attached to the inner periphery of the lens barrel 10. These lens holders are attached so that the optical axes of the lenses 11, 21, and 31 substantially coincide with the optical axis A0 of the optical system 20 (step S2).

  The influence of the tilt of the optical axis of the lens on the optical performance of the optical system 20, that is, aberration, is not equal for each lens constituting the optical system. Even if the tilt amounts of the lenses 11, 21, and 31 are equal, the influence on the optical performance due to the tilt varies depending on the power and relative position of the lenses 11, 21, and 31. In the present embodiment, the first lens 11 has the strongest power among all the lenses constituting the optical system 20, and the tilt amount has the greatest influence on the optical performance of the optical system 20. In the embodiment, the tilt of the first lens 11 is corrected.

  Next, the lens barrel 10 is fixed to the support base 2 of the adjusting device 1 (step S3). In this state, the test chart 7 having a predetermined pattern is imaged in front of the lens barrel 10 (right side in the figure). That is, the test chart is imaged by the optical system 20 to form an image of a predetermined pattern.

  Referring to FIG. 1 again, the optical system 20 forms an image 70 of the test chart 7 on the imaging surface of the imaging device 3, and the imaging device 3 captures the image 70 and generates captured image data (step S4). The evaluation device 4 includes a storage unit that stores reference image data representing the test chart 7 in advance, and compares the reference image data stored in the storage unit with the captured image data from the imaging device 3. Next, the resolution and distortion of the light and shade patterns 70a to 70d (in this embodiment, the light and shade pattern 70a) are detected, and evaluation data relating to the resolution and distortion is calculated (step S5).

  Next, based on the evaluation data calculated in step S5, it is evaluated whether or not the optical characteristics of the optical system 20 fall within an allowable range (step S6).

  FIG. 2A shows the test chart 7. The test chart 7 has light and shade patterns 7a, 7b, 7c, and 7d in four regions on the upper right, upper left, lower left, and lower right of the chart surface, respectively. The density pattern 7a in the upper right area and the lower left area of the test chart 7 is a horizontal stripe, and the intensity pattern 7b in the upper left area and the lower right area is a vertical stripe. Although the test chart 7 is composed of stripes in different directions, a test chart in which the stripe directions are all the same may be used.

FIG. 2B schematically shows an image 70 of the test chart 7 formed by the optical system 20. The shading patterns 70a to 70d of the image 70 correspond to the shading patterns 7a to 7d of the test chart 7 in FIG. In the image 70, the shading pattern 70a is a pattern having a reduced resolution compared to the other shading patterns 70b to 70d. This is because the optical system 20 is poorly adjusted, that is, the first lens holder 12 is not mounted correctly. Specifically, the optical axis of the first lens 11 is inclined with respect to the optical axis A0 of the optical system 20. This is due to tilt. The other shade patterns 70b to 70d reproduce the shade patterns 7b to 7d of the test chart 7 almost accurately.

  The relationship between the tilt amount and tilt direction of the first lens 11 and the resolution reduction and distortion of the light and shade patterns 70a to 70d of the image 70 will be described in detail below. As the tilt amount of the first lens 11 increases, that is, the deviation angle between the optical axis of the first lens 11 and the optical axis A0 of the optical system 20 increases, the resolution of the gray patterns 70a to 70d decreases and distortion also occurs. growing. Further, the tilt direction of the first lens 11 determines the light and dark patterns 70a to 70d that have the lowest resolution and the largest distortion.

  Therefore, it is possible to determine whether or not the optical characteristics of the optical system 20 are within the allowable range by evaluating the evaluation data relating to the reduction in resolution and the magnitude of distortion. If it is determined that the optical characteristics of the optical system 20 are within the allowable range, it is determined that the optical characteristics of the optical system 20 are good, and the evaluation ends (step 11).

  When the optical characteristics of the optical system 20 are not within the allowable range, the amount of tilt correction of the first lens 11 is known based on the evaluation data, and the resolution degradation and distortion are the largest. The tilt direction of the first lens 11 can be determined from the evaluation result of the light and shade pattern (step S7). In the present embodiment, since the first lens 11 is held by the first lens holder 12 having a vertically long plate shape, the tilt direction is limited to a specific direction.

  In the light and shade patterns 70a to 70d of the image 70 in FIG. 2B, the drawing is simplified to show the influence of the mounting failure of the first lens holder 12, and only the light and shade pattern 70a is shown as having a reduced resolution. In practice, however, the light and shade pattern 70a greatly reduces the resolution and causes large distortion. In that case, the other light and dark patterns 70b to 70d also cause a corresponding decrease in resolution or distortion.

  Next, a case where it is determined that the optical characteristics of the optical system 20 are not within the allowable range will be described. Based on the tilt amount to be corrected calculated in step 7, the irradiation control device 5 sets a laser beam irradiation condition for tilt correction from the laser beam irradiation condition table. Thereby, values such as the output value of the laser beam irradiated from the laser marker 6, the irradiation range, the number of irradiations, the irradiation time, and the duty ratio when performing pulse irradiation are set (step S8).

  Next, the laser marker 6 is moved to the irradiation position so that the laser beam is irradiated to the predetermined part of the first lens holder 12 (step S9).

  Next, the laser marker 6 irradiates a predetermined portion of the first lens holder 12 with laser light to deform the first lens holder 12 (step S10). By this deformation, the tilt of the first lens 11 is corrected, that is, adjusted. The predetermined portion 121 is determined in advance in consideration of the shape and size of the first lens holder 12, the characteristics of the lens held by the first lens holder 12, and the like. In the present embodiment, as shown in FIG. 3 (a), the predetermined portion 121 irradiated with the laser light is positioned on the arm portion 12b near the boundary between the arm portion 12b and the frame portion 12a. Stipulated.

  After the tilt adjustment of the first lens 11 by the laser light irradiation described above, the image of the test chart 7 is picked up again by the image pickup device 3 by the optical system 20 to generate picked-up image data (step S4).

  Further, evaluation data is calculated by the evaluation device 4 (step S5). Based on the evaluation data, it is confirmed whether or not the optical characteristics of the optical system 20 are within an allowable range (step S6). If the optical characteristics of the optical system 20 are not within the allowable range, the fine adjustment of the tilt of the first lens 11 is performed by repeating the step 7 and subsequent steps and adding fine deformation to the first lens holder 12. You can also.

Next, laser light irradiation on the first lens holder 12 and deformation of the lens holder will be described in detail.
FIG. 3A shows a specific shape of the first lens holder 12 at the time of injection molding, and FIG. 3B shows the first shape after the laser beam L1 is applied to the part 121 of the arm portion 12b. 1 shows one lens holder 12.

  In FIG. 3A, the first lens holder 12 has a frame portion 12a that holds the outer periphery of the first lens 11, and an arm portion 12b that continues to the frame portion 12a. These frame portion 12a and the arm portion. 12b extends along a straight line 130 indicated by a one-dot chain line during injection molding.

  When such a first lens holder 12 is attached to the inner peripheral portion of the lens barrel 10 at the distal end portion 140 of the arm portion 12b, the first lens holder 12 is attached slightly inclined with respect to the inner peripheral portion of the lens barrel. Assume that the optical axis A1 of the first lens 11 is slightly inclined with respect to the optical axis A0 of the optical system 20. In order to correct such an inclination of the optical axis A1 of the first lens 11, that is, a tilt, the laser beam L1 is irradiated from the laser marker 6 to the part 121 of the arm portion 12b, and the first lens holder 12 is deformed.

  The irradiation with the laser beam L1 will be further described in detail. 3 (a) and 4 (a) and 4 (b), the laser beam L1 is scanned and irradiated so as to cross the irradiation part 121 of the arm part 12b in the width direction of the arm part. By this irradiation, FIG. ), A shallow groove, that is, a score line 120 is formed in the vicinity of the surface of the irradiation part 121 of the arm portion 12b. The score line 120 crosses the arm portion 12b in the width direction from one end to the other end. A plurality of engraving lines 120 formed by scanning irradiation with such laser light L1 are formed in parallel with each other at a predetermined interval.

  The plurality of engraved lines 120 are formed in parallel with each other at an equal interval of 0.14 mm, for example. The line width is preferably in the range of 0.05 mm to 0.5 mm. Such a plurality of engraved lines 120 can be formed by the laser marker 6 deflecting the laser beam L1 in the longitudinal direction of the lens holder 12 and emitting it, and the position of the laser marker 6 is determined by the lens. It can also be formed by moving a small amount in the longitudinal direction of the holder 12 and irradiating the laser beam L1. The engraved line 120 is not limited to a linear groove, and may be a discontinuous groove, for example, a series of small holes.

  By forming a plurality of engraved lines 120 by such laser light irradiation, the first lens holder 12 is deformed in the vicinity of the irradiated region 121 as shown in FIG. Tilt by a predetermined angle. Due to the inclination of the frame portion 12a, the optical axis A1 of the first lens 11 is inclined by a predetermined angle and substantially coincides with the optical axis A0 of the optical system 20. Thus, the tilt adjustment of the first lens 11 is performed in a state where the first lens holder 12 is attached to the lens barrel 10.

  The amount of deformation of the first lens holder 12 by laser light irradiation, specifically, the inclination angle of the frame portion 12a, is determined by the number of engraved lines 120, the width and depth of the engraved lines 120, and the like. Specifically, the inclination angle can be increased by increasing the number of the score lines 120, increasing the width of the score lines 120, increasing the depth of the score lines 120, and the like.

  FIG. 5 is a view for explaining the reason why the plastic molded product is deformed by the irradiation of the laser beam, and shows an enlarged partial cross section of the irradiation site 121 of the first lens holder 12.

  FIG. 5A shows the internal stress distribution remaining in the first lens holder 12 which is a plastic molded product before laser light irradiation, and FIG. 5B shows the first state in the state of FIG. The internal stress distribution after forming a plurality of score lines 120 on the lens holder 12 by laser beam irradiation is shown. These internal stress distributions are represented by contour stripes 101, and the positions having the same stress value are connected by a single line segment. Such a stress distribution is caused by the molten plastic pressure in the mold when the first lens holder 12 is molded, the cooling rate in the cooling process, and the like.

  In FIG. 5A, the internal stress distribution of the first lens holder 12 is almost symmetrical between the upper surface 12A side and the lower surface 12B side, and the stresses on the upper surface and the lower surface are balanced. The upper surface 12A and the lower surface 12B are planes parallel to each other. On the other hand, as shown in FIG. 5B, when the score line 120 is formed only on the upper surface 12A of the first lens holder 12, the stress on the upper surface 12A side is released, so that the upper surface 12A has a concave shape. A shape change that bends occurs.

  The degree of such a shape change varies depending on the laser light irradiation conditions of the laser marker 6 in the same material and the same size plastic member. The main irradiation conditions are laser output value, irradiation range (area of engraved area), and irradiation time. As described above, a large shape change can be obtained by increasing the width or depth of the score line 120 or increasing the number of the score lines 120. Furthermore, a larger shape change can be obtained also by forming the plurality of score lines 120 shown in FIGS. 4 and 5 at a plurality of positions with a predetermined interval.

  As described above, the first lens holder 12 is deformed by the laser light irradiation on the first lens holder 12, and the optical axis of the first lens 11 is adjusted to coincide with the optical axis A0 of the optical system 20. The In the image 70 of the test chart 7 formed by the optical system 20 adjusted in this way, the shading pattern 70a in the upper right region of the image 70 shown in FIG. Becomes higher than before laser light irradiation.

  FIG. 6 is a diagram schematically showing the internal configuration of the digital camera. The digital camera 100 houses the lens barrel 10 having the optical system 20 adjusted by the adjusting device 1 of the present embodiment, the image sensor 111, and the electronic viewfinder 112. An optical system 20 in the lens barrel 10 is used as a photographic lens. Since the optical axis of the optical system 20 is adjusted by the optical system adjustment method of the present embodiment, a high-quality captured image can be obtained.

According to the adjustment device 1 and the adjustment method of the optical system of the present embodiment, the following operational effects are obtained.
(1) With the first, second, and third lens holders 12, 22, and 32 holding the first, second, and third lenses 11, 21, and 31 respectively attached to the lens barrel 10, Since the inclination of the optical axis of the first lens 11 can be adjusted by irradiating the first lens holder 12 with the laser beam, the adjustment work can be easily performed.
(2) The optical performance of the optical system 20 is evaluated in a state where all the lenses are incorporated in the lens barrel 10, and the first lens holder 12 is irradiated with laser light based on the evaluation data. Since the inclination of the optical axis is adjusted, the adjustment work can be automated.
(3) After attaching the lens holder to the lens barrel, it is possible to adjust the optical characteristics by adjusting the lens holder, so even if there are performance variations from part to part or errors in attaching to the lens barrel, It is possible to adjust after assembling the lens barrel to reduce a decrease in optical performance due to these variations. As a result, it can be expected to contribute to the improvement of the yield rate in the manufacturing process.
(4) Conventionally, it has been necessary to change the dimensions of the mold used for molding so that the shape of the plastic part after molding becomes the shape as designed. For this reason, in order to start production of a new product, a long preparation period including adjustment of a mold was required. However, according to the present invention, it is possible to correct the shape after molding the plastic and assembling the optical system. Therefore, the time required for changing the dimensions of the mold can be saved, and the preparation period until the start of production can be saved. It can be expected to shorten.

  Next, a third embodiment, which is a modification of the second embodiment, will be described. -Third embodiment (adjustment method)-

In the second embodiment described above, the first lens 11 has the strongest power among all the lenses constituting the optical system 20, and therefore the tilt amount of the first lens 11 is the optical performance of the optical system 20. The tilt of the first lens 11 has been corrected.

  If the second lens 21 has the strongest power, it is necessary to adjust the tilt of the second lens. In that case, the laser marker 6 is moved to the position 6A of the two-dot chain line facing the second lens holder 22. In this state, the image of the test chart 7 is picked up and the picked-up data is evaluated. Based on the evaluation result, the laser marker 6 irradiates the predetermined irradiation site of the second lens holder 22 with the laser light L1A. Therefore, as shown in FIG. 1, the laser marker 6 can be moved vertically and horizontally in a plane perpendicular to the optical axis of the optical system 20.

  In the lens barrel 10, as shown in FIG. 1, the first lens holder 12 and the second lens holder 22 are arranged so that their attachment positions with respect to the inner peripheral surface of the lens barrel 10 are greatly different in angle. Keep it. In the illustrated example, the state is shifted by 180 degrees. Thereby, when the laser marker 6 irradiates the second lens holder 22 with the laser beam, there is no possibility that the first lens holder 12 blocks the laser beam.

  As described above, it is desirable that the lens holder positioned closer to the imaging device 3 than the lens holder irradiated with the laser light does not overlap the lens holder targeted for laser light irradiation as viewed from the laser marker 6. In other words, it is desirable that the lens holder to be irradiated with the laser beam and the lens holder located in front of it (on the imaging device side) are attached to the lens barrel 10 at different angular positions.

  In the above example, the laser marker 6 is moved to irradiate the second lens holder 22 with the laser beam. However, without moving the position of the laser marker 22, a deflecting member such as a mirror is inserted and removed. It is also possible to irradiate the lens holder 22 with laser. For example, mirrors may be inserted on the broken line indicated by L1 and the broken line indicated by L1A, respectively, so that the laser light L1 is moved to the laser light L1A.

-Fourth embodiment (adjustment method)-
In the second and third embodiments described above, the lens holder 12 is irradiated with laser light to adjust the tilt of the optical axis of the lens 11. In the present embodiment, two adjustments are performed: tilt of the optical axis of the lens and shift of the optical axis with the optical system 20 incorporated in the lens barrel 10. The lens shift is a shift in the plane in which the optical axis of the lens is perpendicular to the optical axis of the optical system 20.

  The adjustment device of the present embodiment is also substantially the same as the adjustment device 1 shown in FIG. 1, and the difference from the adjustment device 1 is the shape of the lens holder. The lens to be adjusted is the first lens 11 in FIG. 1 as in the first embodiment.

  In the first embodiment, the first lens 11 is held by the first lens holder 12, but in the second embodiment, the first lens 11 is a lens as shown in FIG. The lens holder 1200 is attached to the inner periphery of the lens barrel 10.

  In FIG. 7, a lens holder 1200 is connected to a frame portion 1200a that holds the outer periphery of the first lens 11, a first arm portion 1200b that is connected to the frame portion 1200a, and a first arm portion 1200b. Second arm portion 1200c.

  The first arm portion 1200b has a stepped portion 1222 having a shape in which a flat plate is bent, and has bifurcated portions 1223a and 1223b branched in a shape at the tip of the first arm portion. The first arm portion 1200b has an irradiation region 1221 that irradiates the laser beam L1 in the vicinity of the boundary with the frame portion 1200a. Each of the bifurcated portions 1223a and 1223b is formed with a through hole 1224, and a shaft portion 1225 indicated by a dotted line is inserted into the through hole 1224. The shaft portion 1225 extends in parallel with the optical axis A1 of the first lens 11, and both ends thereof are fixed to the inner peripheral portion of the lens barrel 10. Thus, the first arm portion 1200b is supported so as to be rotatable about the shaft portion 1225. The through hole 1224 is positioned on a straight line P1 that extends in the extending direction of the first arm portion 1200b through the center of the first lens 11.

  One end of the second arm portion 1200c is fixed to the bifurcated portion 1223b, and protrudes from the first arm portion 1200b in a direction perpendicular to the optical axis of the optical system 20 in FIG. The entire second arm portion 1200c is slightly curved, a recess 1227 is formed at the other end, and a shaft portion 1228 indicated by a dotted line is inserted into the recess 1227. The shaft portion 1228 extends in parallel with the optical axis A1 of the first lens 11, and both ends thereof are fixed to the inner peripheral portion of the lens barrel 10.

  The second arm portion 1200c protrudes from the first arm portion 1200b at an acute angle θ with respect to the straight line P1 on the first arm portion 1200b. Further, the second arm portion 1200c has an irradiation region 1226 in the vicinity of one end fixed to the bifurcated portion 1223b. The irradiation area 1226 is defined on a plane parallel to the optical axis A1 of the first lens 11.

<Tilt adjustment>
In FIG. 1, the optical system 20 of the lens barrel 10 forms an image of the test chart 7 on the imaging surface of the imaging device 3 with all the lens holders including the lens holder 1200 attached to the lens barrel 10. . The imaging device 3 captures this image and generates image data. The evaluation device 4 calculates evaluation data related to the tilt amount and shift amount of the optical system 20 based on the comparison between the image data and the reference image data. Based on this evaluation data, the irradiation control device 5 uses a tilt laser light irradiation condition for correcting the tilt amount of the first lens 11 and a shift laser for correcting the shift amount of the first lens 11. Each light irradiation condition is calculated.

  The laser marker 6 irradiates the irradiation region 1221 on the first arm unit 1200b with the laser beam L1 based on the tilting laser beam irradiation condition. As a result, a plurality of engraving lines 1231 are formed in the irradiation region 1221, the first arm portion 1200 is deformed in the irradiation region 1221, and the frame portion 1200 a is inclined as indicated by the symbol T so that the first lens 11 is tilted. The tilt of the optical axis A1 is adjusted.

<Shift adjustment>
Following the above-described tilt adjustment, the laser marker 6 irradiates the irradiation region 1226 of the second arm portion 1200c with the laser beam L1 based on the laser beam irradiation condition for shifting. By this laser light irradiation, a plurality of engraved lines 1232 are formed in the irradiation region 1226. The direction in which these engraved lines 1232 are formed is substantially parallel to the direction of the optical axis A1 of the first lens 11.

  Since the irradiation region 1226 of the second arm portion 1200c is on a plane parallel to the optical axis of the first lens 11, it is also substantially parallel to the laser light L1 of the laser marker 6. Therefore, it is difficult for the laser marker 6 to directly irradiate the irradiation region 1226 with the laser light L1. Therefore, the adjustment device of the present embodiment arranges one or more reflection mirrors in the lens barrel 10 that change the direction of the laser light L1 output from the laser marker 6. Thereby, the reflection mirror in the lens barrel 10 reflects the laser beam L1 and irradiates the irradiation region 1226 of the second arm portion 1200c. Instead of this reflection mirror, an optical fiber can be used to guide the laser beam L1 to the irradiation region 1226 of the second arm portion 1200c.

  By irradiating the irradiation region 1226 with laser light, the second arm portion 1200c is deformed in the irradiation region 1226, and the angle θ changes. Accordingly, the first arm portion 1200b rotates around the shaft portion 1225 by a minute amount in a predetermined direction. As a result, the first lens 11 has its optical axis A1 moved (shifted) in the direction indicated by S, and the shift (shift) of the optical axis A1 of the first lens 11 is adjusted. In the case where the first arm portion 1200b is rotated in the opposite direction to the shift adjustment, the laser marker 6 irradiates the back surface of the irradiation region 1226 of the second arm portion 1200c with laser light.

  Also in this embodiment, after the tilt adjustment and the shift adjustment are completed, the image of the test chart 7 is captured again to generate captured image data, and evaluation data is calculated based on the captured data. Based on this evaluation data, it is determined whether or not the tilt adjustment and shift adjustment are insufficient. If the tilt adjustment and shift adjustment are insufficient, laser light irradiation is performed again based on the evaluation data, and the tilt is adjusted. And / or fine adjustment of the shift.

  According to the adjustment device 1 and the adjustment method of the optical system of the present embodiment, in addition to the operational effects described in the first embodiment, the shift of the first lens 11 can also be adjusted. A system can be provided.

  In the second embodiment, the tilt adjustment of the first lens 11 is performed first and the shift adjustment is performed later, but the order of adjustment may be reversed. Further, the adjustment of the tilt of the lens 21 may be omitted and only the adjustment of the shift may be performed.

  In the above-described embodiment, the case where the injection molded lens holder is deformed by laser light irradiation has been described. However, the present invention can be applied to any member as long as it is a molded plastic member. In particular, the present invention is preferably applied to a molding method including a heating step, that is, a plastic member manufactured by the above-described injection molding or press molding. As a material for the plastic member, a resin blended with nylon or glass fiber can be used.

  In addition, the case where the lens holder is deformed by forming a score line by irradiating the laser beam to the lens holder has been described. The shape of the lens holder may be changed.

  In the above-described embodiment, an example has been described in which the lens for correcting the shape of the lens holder is determined in advance among the plurality of lenses, but the shape of the lens holder is corrected based on the result of the measured optical characteristics. A lens may be selected. In this case, the correspondence between the optical characteristics and the lens to be corrected is checked in advance.

  In addition, although an example in which one predetermined portion to be irradiated with laser is determined has been described, a plurality of portions to be irradiated are set in one component, and a portion to be irradiated is selected according to measured optical characteristics. You may do it. The adjusting device in FIG. 1 includes one laser marker, but may be configured to include a plurality of laser markers. For example, they may be used separately for tilt correction and shift correction, for the first lens holder, and for the second lens holder.

  In the above-described embodiment, a predetermined pattern is imaged by the optical system and the optical characteristic is evaluated. As another example of the evaluation of the optical characteristic, the predetermined pattern is projected and projected by the optical system. The pattern image may be evaluated. Further, instead of the evaluation with the pattern, the optical characteristics may be evaluated by interference, the part to be irradiated with the laser may be determined based on the evaluation result, the laser may be irradiated, and the shape of the lens holder may be corrected.

  In the above-described embodiment, the example of correcting the shape of the lens holder has been described. However, it is possible to correct the shape of a holder that holds a reflecting member such as a mirror as well as a lens (transmission member).

In the above-described embodiment, the shape is corrected by irradiating a laser beam to a holder made of a plastic molding member that holds an optical component. It is also possible to apply to correction of the plastic member to hold. For example, it can be used to adjust the mounting position of an image sensor such as a CCD or CMOS. Such an embodiment will be described with reference to FIG.
-Fifth Embodiment (Image Sensor Adjustment Method)-

  FIG. 9 is a diagram schematically illustrating adjustment of the image sensor mounting position. The adjustment device 91 used for adjusting the mounting position of the image sensor is similar to the optical system adjustment device shown in FIG. Adjustment of the image sensor mounting position is performed as follows.

  First, the camera body 100 to which the lens barrel 10 incorporating the optical system 20 is attached is fixed to the support base 2 of the adjustment device 91. The optical performance of the lens barrel 10 is grasped in advance. An image sensor 93 is attached to the camera body 100. The periphery of the image pickup device 93 is held by fitting or bonding to a plastic holding member 94, and the image pickup device 93 is attached to the camera body via the plastic holding member 94. An optical filter and a drive circuit board for the image sensor 93 may be provided on the front surface and the back surface of the image sensor 93, respectively.

  Next, the test chart 7 is imaged by the imaging element 93 incorporated in the camera body through the optical system 20 to generate captured image data. Evaluation is performed by obtaining an amount of deviation from the reference position of the image sensor 93 by the evaluation device 4 based on the captured image data. The irradiation control device 5 stores in advance a laser light irradiation condition table in which the amount of deviation from the reference position of the image sensor 93 and the irradiation condition of the laser light irradiated from the laser marker 6 are associated with each other. The laser marker 6 irradiates a predetermined position of the plastic holding member 94 of the image sensor 93 based on the laser light irradiation conditions determined by the irradiation control device 5 based on the laser light irradiation condition table. . The laser marker 6 may be moved to a predetermined irradiation position prior to the irradiation.

  In the above description, the laser beam from the laser marker 6 is directly irradiated onto the plastic holding member 94. However, the plastic holding member 94 may be irradiated through a mirror or a lens. .

  As described above, according to the image sensor adjustment method of the present embodiment, the imaging state of the test chart 7 by the image sensor 93 is evaluated in a state where the image sensor 93 is attached to the camera body 100, and based on the result. The position of the image sensor 93 is adjusted. With such a configuration, the normal line of the image sensor 93 and the optical axis of the optical system 20 can be adjusted with high accuracy.

  Instead of performing adjustment in the state of the camera body 100 to which the image sensor 93 is attached, adjustment may be performed using a jig or the like before the image sensor 93 is attached to the camera body 100. In this case, it is necessary to use a jig whose positional relationship between the plastic holding member 94 to which the image sensor 93 is attached and the optical system 20 is the same as in the state through the camera body 100. In this case, the laser beam from the laser marker 6 may be irradiated from between the test chart 7 and the lens barrel 10. It is also possible to provide a mirror on the jig arranged at the position of the optical system 20.

  As in the present embodiment, a predetermined pattern is imaged, and the image data is evaluated to irradiate a predetermined position of the plastic member to which the CCD is mounted with laser light, thereby correcting the mounting position of the CCD. In this case, image data is created through an optical system having a certain degree of accuracy.

  The present invention is not limited to the embodiment described above as long as the characteristics are not impaired.

The disclosure of the following priority application is hereby incorporated by reference.
Japanese application 2011-089451 (filed on April 13, 2011)

Claims (18)

A first arm portion having a first predetermined portion irradiated with laser light and provided in a direction intersecting with the optical axis of the lens, and a light of the lens having a second predetermined portion irradiated with laser light. An assembly step of assembling an optical system by attaching the lens in a lens barrel using a second arm portion provided in a direction intersecting the direction of the axis and the direction in which the first arm portion is provided;
Based on an evaluation result of optical characteristics of the optical system using an image by the optical system, the first predetermined portion is irradiated with laser light to deform the first arm portion, thereby changing the optical axis of the lens. Correction of correcting the direction and correcting the position of the lens in the direction along the plane intersecting the optical axis of the lens by irradiating the second predetermined portion with laser light and deforming the second arm portion And a method of manufacturing an optical system. A method of manufacturing an optical system according to claim 1,
The first arm portion has one end connected to the lens frame of the lens and the other end connected to the barrel.
The second arm portion is an optical system manufacturing method in which one end side is connected to the first arm portion and the other end side is connected to the lens barrel. A method for manufacturing an optical system according to claim 1 or 2,
In the correcting step, a groove in a direction substantially orthogonal to a direction parallel to the optical axis of the lens is formed in the first predetermined portion by laser light, and a groove substantially parallel to the optical axis of the lens is formed in the second portion. The manufacturing method of the optical system formed in the predetermined part. It is a manufacturing method of the optical system given in any 1 paragraph of Claims 1-3,
The first arm portion and the second arm portion are a manufacturing method of an optical system containing a plastic. It is a manufacturing method of the optical system according to claim 4,
The first arm part and the second arm part are manufacturing methods of an optical system including a plastic member molded by an injection molding method. A method for manufacturing an optical system according to any one of claims 1 to 5,
In the correcting step, the first predetermined portion is irradiated with laser light to deform the first arm portion, and then the second predetermined portion is irradiated with laser light to deform the second arm portion. Manufacturing method of optical system. A method for manufacturing an optical system according to any one of claims 1 to 5,
In the correcting step, the second predetermined portion is irradiated with laser light to deform the second arm portion, and then the first predetermined portion is irradiated with laser light to deform the first arm portion. Manufacturing method of optical system. A method for producing an optical system according to any one of claims 1 to 7,
The evaluation result is that an image of a predetermined pattern formed by the optical system assembled in the assembly process is captured by an imaging device to generate image data, and the optical characteristics of the optical system are evaluated based on the image data The manufacturing method of the optical system which is the result. A method for producing an optical system according to claim 8,
An optical system manufacturing method using a test chart having a plurality of patterns as the predetermined pattern. A method for manufacturing an optical system according to any one of claims 1 to 9,
The first arm portion and the second arm portion are a method of manufacturing an optical system that is a lens holding component that holds a photographing lens of a digital camera. A lens provided in the lens barrel;
A first groove formed by irradiation of laser light that changes the direction of the optical axis of the lens has a first region provided along the first direction, and intersects a direction parallel to the optical axis of the lens. A first arm provided in a direction;
A second groove formed along the second direction by a second groove formed by irradiation with a laser beam that changes the position of the lens in a direction along a plane intersecting the optical axis of the lens; A lens barrel having a second arm provided in a direction parallel to an optical axis of the lens and a direction intersecting with a direction provided with the first arm. A lens barrel according to claim 11, wherein
The first direction is substantially orthogonal to a direction parallel to the optical axis of the lens,
The lens barrel in which the second direction is substantially parallel to the optical axis of the lens. A lens barrel according to claim 11 or claim 12,
The first arm has one end connected to the lens frame of the lens and the other end connected to the barrel.
The second arm is a lens barrel having one end connected to the first arm and the other end connected to the barrel.   An optical apparatus having the lens barrel according to any one of claims 11 to 13. An imaging unit having an imaging surface;
The first groove formed by the irradiation of the laser beam that changes the direction of the imaging surface has a first region provided along the first direction, and is provided in a direction that intersects the direction orthogonal to the imaging surface. A first arm,
There is a second region in which a second groove formed along the second direction is formed by irradiating a laser beam that changes the position of the imaging unit in a direction along a plane intersecting a direction orthogonal to the imaging plane. And an imaging device having a second arm provided in a direction orthogonal to the imaging surface and a direction intersecting with the direction in which the first arm is provided. The imaging apparatus according to claim 15, wherein
The first direction is substantially orthogonal to the direction orthogonal to the imaging surface,
The imaging device, wherein the second direction is a direction substantially orthogonal to the imaging surface. An imaging apparatus according to claim 15 or claim 16, wherein
The first arm has one end connected to the imaging unit and the other end connected to the body of the imaging device,
The second arm is an imaging device in which one end side is connected to the first arm and the other end side is connected to the body of the imaging device. An optical apparatus comprising the imaging device according to any one of claims 15 to 17.

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