JP7467050B2 - Optical device and imaging device - Google Patents

Description

The present invention relates to an optical device and an imaging device using the same.

In optical devices equipped with optical components such as lenses, it is necessary to prevent the optical components from shifting position due to impact or environmental changes.

Patent document 1 discloses an optical device in which a means for fixing an optically adjusted lens holding member to a base member is provided on the front side of the lens holding member. The lens holding member is fixed by positioning a convex portion on the lens holding member inside a through hole portion provided in the base member, and hardening an adhesive that is filled around the convex portion in the through hole portion.

JP 2018-97228 A

However, in the optical device described in Patent Document 1, optical adjustment is performed by inserting an adjustment tool from the side of the lens holding member, while the lens holding member and base member are fixed from the front side of the lens holding member with an adhesive, making assembly complicated. Furthermore, if the means for fixing the lens holding member and base member were simply placed on the side of the lens holding member, the convex portion on the lens holding member could not be placed inside the through-hole portion on the base member.

The object of the present invention is to provide an optical device that is easy to assemble and an imaging device using the same.

In order to achieve the above-mentioned object, the optical device comprises a base member and a holding member that holds an optical member, one of the base member and the holding member being provided with a first hole portion that penetrates the optical member in a radial direction and a groove portion that communicates with the first hole portion, and the other of the base member and the holding member being provided with a first convex portion that passes through the groove portion and is positioned in the first hole portion , and a second convex portion that is positioned in the groove portion, and the base member and the holding member are bonded together by an adhesive contained in a space formed by the first hole portion, the first convex portion, and the second convex portion.

It is possible to provide an optical device that is easy to assemble and an imaging device that uses the same.

1 is a cross-sectional view of an interchangeable lens 50 according to a first embodiment in a state in which the entire length of the interchangeable lens 50 is contracted (TELE). 1 is a cross-sectional view of an interchangeable lens 50 according to a first embodiment in a state in which the entire length of the lens is extended (WIDE). 1 is a system block diagram of an interchangeable lens 50 and a camera body according to a first embodiment. 2 is an exploded perspective view of members relating to a first group barrel 2 of the interchangeable lens 50 of Example 1. FIG. FIG. 2 is a perspective view of a first group base 4 of the interchangeable lens 50 of the first embodiment. 3 is a partial cross-sectional view of an adhesive structure for an interchangeable lens 50 according to a first embodiment. FIG. FIG. 11 is a partial perspective view of a holding barrel 202 according to a second embodiment.

Example 1
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the optical axis direction shown by the dashed line in the drawings, the object side of an interchangeable lens 50 (optical device) equipped with a lens that is an optical member is defined as the front side, and the fixed side (imaging surface side) fixed to a camera body 70 by a bayonet is defined as the rear side. An interchangeable lens 50 according to a first embodiment of the present invention will be described with reference to Figs. 1 and 2.

Figure 1 is a cross-sectional view of an interchangeable lens 50 in a TELE state in which the overall length of the interchangeable lens 50 is contracted. Figure 2 is a cross-sectional view of an interchangeable lens 50 in a WIDE state in which the overall length of the interchangeable lens 50 is extended. A first-group lens 1, which is an optical member, is held by a first-group barrel 2. The first-group barrel 2 is held by a first-group adjustment ring 3, which moves the first-group barrel 2 on a plane in the optical axis direction and in a direction perpendicular to the optical axis direction for optical adjustment. The first-group barrel 2 and the first-group adjustment ring 3 are held by a first-group base 4. The interchangeable lens 50 has multiple optical members as described below, and the first-group adjustment ring 3 is a holding member that holds at least some of the multiple optical members.

The linear barrel 5 has a threaded portion formed on the object side for attaching a filter (not shown). The linear barrel 5 and the first lens group 1 move together with the zoom operation, but in the first embodiment, they are supported and moved by separate support structures (not shown). The cosmetic ring 6 has the specifications of the interchangeable lens 50 printed on it, and is fixed to the linear barrel 5 with a screw and forms the exterior appearance.

The second lens group 7 (focus lens) is held by the second barrel 8, and the second barrel 8 is supported and moved so that it can move back and forth along the optical axis direction by a drive mechanism (ultrasonic motor unit 30) and a linear guide mechanism (not shown), performing a focusing operation. This linear guide mechanism uses two cylindrical members that extend in the optical axis direction, known as guide bars, one of which determines the inclination/eccentricity of the second barrel 8, and the other determines the rotational position around the optical axis. The second barrel 8 is supported so that it can move back and forth along the guide bar.

The third lens group 9 is held by a third lens barrel 10. The fourth lens group 11 is held by a fourth lens barrel 12, which moves the fourth lens group 11 on a plane perpendicular to the optical axis direction, thereby providing an optical vibration-proof function that corrects camera shake. The actuator that produces this optical vibration-proof function is a voice coil motor, but a detailed description of its configuration will be omitted.

The fifth group lens 13 is held by the fifth group barrel 14, and the sixth group lens 15 is held by the sixth group barrel 16. The fifth group barrel 14 is fixed to the sixth group barrel 16 with screws (not shown). Each of the lens groups described above is not necessarily composed of a single lens, and may be composed of multiple lens groups, but for the sake of simplicity, details will be omitted.

The aperture unit 17, which adjusts the amount of light, is fixed to the fourth-group barrel 12 and has multiple light-shielding blades. The multiple light-shielding blades of the aperture unit 17 are driven by a stepping motor (not shown) as a drive source, making it possible to set the desired F-number. The aforementioned third-group barrel 10 is sandwiched between the aperture unit 17, which is fixed integrally to the fourth-group barrel 12, and the fourth-group barrel 12, but can move in the optical axis direction.

The sub-aperture unit 18, which cuts out a certain amount of flare light, is supported by the 4-group barrel 12 and has multiple light-shielding blades inside, just like the aperture unit 17. The multiple light-shielding blades of the sub-aperture unit 18 are driven by a mechanical linkage mechanism (not shown), making it possible to change the aperture shape of the multiple light-shielding blades to correspond to the zoom positions from TELE to WIDE.

A guide tube 19 is provided, and a cam ring 20 is further provided that rotatably engages with the outer periphery of this guide tube 19. A front fixed tube 22 is provided on the object side, and a rear fixed tube 21 is provided on the camera body 70 side, with the front fixed tube 22 fixed to the front side of the rear fixed tube 21 with screws. Furthermore, the rear fixed tube 21 is fixed with a printed circuit board 23 on which the guide tube 19, outer tube 24, mount 25, lens driving IC, microcomputer, etc. are arranged.

The outer peripheral surface of the outer tube 24, which is fixed to the rear fixed tube 21 with a screw, is provided with a switch (not shown) for switching between MF and AF and IS modes. In addition, the back cover 27 is fixed to the mount 25, which is fixed to the rear fixed tube 21 with a screw, and a light-shielding wire is arranged on its inner surface to block harmful light. The mount tube 26 is fixed between the rear fixed tube 21 and the mount 25, and like the back cover 27, a light-shielding wire is arranged on its inner surface. In the interchangeable lens 50 of the first embodiment, the focal position of the imaging unit 78 (imaging element) can be adjusted by changing the thickness of the mount tube 26 in the optical axis direction by processing or the like. The contact block 28 is connected to the printed circuit board 23 by wiring (such as a flexible board) (not shown) and fixed to the mount 25 with a screw.

The MF ring unit 29 is supported in a fixed position so that it can rotate around the front fixed barrel 22. When the MF ring unit 29 is rotated, a sensor (not shown) detects the rotation and drives the second lens barrel 8 according to the amount of rotation, thereby controlling the focusing of the second lens group 7.

The ultrasonic motor unit 30 is the drive source for the second-group barrel 8, and can move by itself due to ultrasonic vibrations generated by a piezoelectric element. The second-group barrel 8 and the ultrasonic motor unit 30 are engaged by a connecting mechanism (not shown), and the second-group barrel 8 can move together with the ultrasonic motor unit 30. A light-shielding wall (not shown) attached to the second-group barrel 8 switches between light-shielding and light-transmitting of a photointerrupter (not shown), and this light-shielding/light-transmitting state is detected electrically, and the advance/retract position (reference position) of the second-group barrel 8 is grasped based on the detection value. By moving the second-group barrel 8 a specified amount from this reference position, it is possible to move it to the desired focusing position.

The first base 31 of the second lens group 7 holds one end of the guide bar that constitutes the linear guide mechanism described above. The second base 32 of the second lens group 7 holds the other end of the guide bar, the ultrasonic motor unit 30, and the photointerrupter. In other words, the guide bar is sandwiched between the first base 31 and the second base 32 and fixed in a predetermined position.

The function ring unit 33 is supported so that it can rotate in a fixed position around the front fixed barrel 22 as an axis. After the function ring unit 33 is assembled, the front cover 34 is fixed to the front fixed barrel 22 with screws to hold it down. The amount of rotation of the function ring unit 33 is detected by a sensor (not shown), similar to the MF ring unit 29. In the first embodiment, the aperture unit 17 is controlled by this detected value, and the F-number can be changed to any desired value. It is also possible to assign changes to shooting conditions other than the F-number, such as ISO sensitivity and shutter speed, to the function ring unit 33.

The manual zoom ring 35 is rotatably supported on the rear fixed barrel 21. The cam ring 20 and the manual zoom ring 35 are connected by a connecting member (not shown), and the cam ring 20 rotates when the user rotates the manual zoom ring 35.

Next, the position adjustment mechanism (zoom operation) for each lens group will be described. The first group base 4, which holds the first group barrel 2 and the first group adjustment ring 3, the third group barrel 10, the second group barrel 8, and the second base 32 of the second group lens 7, which holds the ultrasonic motor unit 30, each have rollers (not shown) arranged thereon, which engage with the cam ring 20.

As mentioned above, the fourth group barrel 12 is equipped with an actuator and a sub-aperture unit 18 for providing optical vibration isolation, but also has an aperture unit 17 arranged in front of the third group barrel 10. The sixth group barrel 16, which holds the fourth group barrel 12 and the fifth group barrel 14, each has rollers (not shown) arranged therein, which engage with a cam ring 20.

These rollers engage with cam grooves (not shown) provided on the cam ring 20, which have different trajectories. The cam grooves are trajectories that allow each lens group to have the optically desired lens spacing at the desired zoom position. As the cam ring 20 rotates around the optical axis, the first group base 4, third group barrel 10, fourth group barrel 12, sixth group barrel 16, and second base 32 can be positioned from the retracted TELE position shown in FIG. 1 to the extended WIDE position shown in FIG. 2, or any zoom position in between.

The rotation of the cam ring 20 is detected by a sensor (not shown), and the zoom position according to the amount of rotation is determined from the detected signal by an IC mounted on the printed circuit board 23, and focus, vibration reduction, and aperture control are performed according to the zoom position.

The interchangeable lens 50 of the first embodiment is detachably bayonet-fixed to the camera body 70, which is an imaging device, by the mount 25. When the interchangeable lens 50 is fixed to the camera body 70 by the mount 25, the printed circuit board 23, which controls the operation of each lens group, is able to communicate with the camera body 70 via the contact block 28.

The imaging unit 78 is mounted on the camera body 70 and is an optical-electrical conversion element (imaging element) such as a CMOS or CCD that receives light from the subject that has passed through the interchangeable lens 50 and converts the light into an electrical signal.

Figure 3 shows the electrical configuration of the camera system in the interchangeable lens 50 and the camera body 70. First, the control flow inside the camera body 70 will be described. The camera CPU 71 is composed of a microcomputer. The camera CPU 71 controls the operation of each part in the camera body 70. When the interchangeable lens 50 is attached, the camera CPU 71 communicates with the lens CPU 51 provided in the interchangeable lens 50 via the lens side electrical contact 52 and the camera side electrical contact 72. The information (signal) that the camera CPU 71 transmits to the lens CPU 51 includes information on the drive amount of the second lens group 7, translational shake information, and focus shake information. The information (signal) that the lens CPU 51 transmits to the camera CPU 71 includes imaging magnification information. Note that the lens side electrical contact 52 and the camera side electrical contact 72 include contacts for supplying power from the camera body 70 to the interchangeable lens 50.

The power switch 73 is a switch that can be operated by the photographer, and can start the camera CPU 71 and start the power supply to each actuator, sensor, etc. in the camera system. The release switch 74 is a switch that can be operated by the photographer, and has a first stroke switch SW1 and a second stroke switch SW2. A signal from the release switch 74 is input to the camera CPU 71. In response to the input of an ON signal from the first stroke switch SW1, the camera CPU 71 enters a shooting preparation state. In the shooting preparation state, the luminance of the subject is measured by the photometry unit 75, and focus detection is performed by the focus detection unit 76.

The camera CPU 71 calculates the aperture value of the aperture unit 17 and the exposure (shutter time) of the image sensor of the imaging unit 78 based on the photometry results from the photometry unit 75. The camera CPU 71 also determines the drive amount (including the drive direction) of the second lens group 7 and the second lens barrel 8 to obtain a focused state for the subject based on focus information (defocus amount and defocus direction) that is the detection result of the focus state of the photographic optical system by the focus detection unit 76. The drive amount information (drive amount information of the second lens group 7) is sent to the lens CPU 51. The lens CPU 51 controls the operation of each component of the interchangeable lens 50.

Furthermore, when the camera CPU 71 enters a specified shooting mode, it starts controlling the shift drive of the second group barrel 8, i.e., the vibration isolation operation. When an ON signal is input from the second stroke switch SW2, the camera CPU 71 sends an aperture drive command to the lens CPU 51, and sets the aperture unit 17 to the aperture value previously calculated. The camera CPU 71 also sends an exposure start command to the exposure section 77, which causes the retraction operation of the mirror (not shown) and the opening operation of the shutter (not shown) to be performed, and causes the image sensor of the imaging section 78 to perform photoelectric conversion of the subject image, i.e., the exposure operation.

The imaging signal from the imaging unit 78 is digitally converted by the signal processing unit in the camera CPU 71, and then various correction processes are performed before it is output as an image signal. The image signal (data) is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, or an optical disk in the image recording unit 79.

Next, the control flow inside the interchangeable lens 50 will be described. The MF ring rotation detector 53 detects the rotation of the MF ring unit 29, and the ZOOM ring rotation detector 54 detects the rotation of the manual zoom ring 35.

The IS driver 55 includes a drive actuator for the second lens barrel 8 that performs vibration isolation and its drive circuit. The AF driver 56 performs AF drive of the second lens barrel 8 through the AF motor (ultrasonic motor unit 30) in response to drive amount information for the second lens 7 sent from the camera CPU 71.

The electromagnetic aperture drive unit 57 is controlled by the lens CPU 51, which receives an aperture drive command from the camera CPU 71, and operates the aperture unit 17 to an opening state corresponding to the specified aperture value.

The angular velocity sensor 58 is mounted on the interchangeable lens 50 and connected to the printed circuit board 23. The angular velocity sensor 58 detects the angular velocity of each of the vertical (pitch) and horizontal (yaw) shakes, which are the angular shakes of the camera system, and outputs the detected values as angular velocity signals to the lens CPU 51. The lens CPU 51 electrically or mechanically integrates the angular velocity signals in the pitch and yaw directions from the angular velocity sensor 58 to calculate the pitch shake amount and yaw shake amount, which are the amounts of displacement in each direction (collectively referred to as the angular shake amount).

The lens CPU 51 controls the IS driver 55 based on the combined displacement amount of the angular shake amount and the translational shake amount described above to shift and drive the second group barrel 8, thereby performing angular shake correction and translational shake correction. In addition, the lens CPU 51 controls the AF driver 56 based on the amount of focus shake to drive the second group barrel 8 in the optical axis direction, thereby performing focus shake correction.

Next, the first group barrel 2 in the interchangeable lens 50 of the first embodiment will be described. The interchangeable lens 50 of the first embodiment has an optical adjustment mechanism for obtaining the desired optical performance by decentering or tilting some lenses, or moving them along the optical axis direction. One of the optical adjustment mechanisms is an eccentricity adjustment mechanism and thrust position adjustment mechanism for the first group lens 1 of the first group barrel 2. Figure 4 is an exploded perspective view of the members related to the first group barrel 2. The configuration of the first group barrel 2 will be described in detail using Figure 4.

The thrust adjustment cam 3a is provided in the first group adjustment ring 3 and is a through hole with a lead along the rotation direction centered on the optical axis of the first group adjustment ring 3. After the first group barrel 2 is stored inside the first group adjustment ring 3, three thrust adjustment rollers 37 are arranged at equal intervals of 120° around the circumference of the first group barrel 2 and engage with the thrust adjustment cam 3a. Each thrust adjustment roller 37 is fixed to the first group barrel 2 by a screw 37a. By rotating the first group barrel 2, each thrust adjustment roller 37 moves along the lead of the thrust adjustment cam 3a, and the first group barrel 2 can move along the optical axis relative to the first group adjustment ring 3. The thrust adjustment cam 3a and thrust adjustment rollers 37 constitute a thrust position adjustment mechanism.

The decentering adjustment groove 4c is a substantially rectangular through hole provided in the first group base 4. After the first group adjustment ring 3 is stored inside the first group base 4, three eccentric rollers 38 are arranged at equal intervals of 120° around the circumference of the first group adjustment ring 3 and engage with the eccentric adjustment groove 4c. Each eccentric roller 38 is fixed to the first group adjustment ring 3 by a screw 38a. The eccentric adjustment groove 4c in the first embodiment is substantially rectangular with the optical axis direction as the long side, and the eccentric diameter part of the eccentric roller 38 engages with its width in the short side direction. When the eccentric roller 38 rotates in the eccentric adjustment groove 4c around the eccentric diameter part, the cylindrical part on the first group adjustment ring 3 side, which has a center different from the center of rotation, moves eccentrically with respect to the rotation. Using this eccentric movement, the first group adjustment ring 3 can be decentered relative to the first group base 4, and thus the first group barrel 2 and the first group lens 1 fixed to the first group adjustment ring 3 can be decentered with respect to the optical axis. Since an eccentricity adjustment mechanism using such an eccentric roller 38 is a common configuration for an interchangeable lens 50, detailed descriptions of its operation and the shape of the eccentric roller will be omitted and only the above description will be given.

The first group rollers 36 are fixed to the first group base 4 at equal intervals of 120° with screws (not shown), and by engaging with the cam grooves provided in the cam ring 20, the first group base 4 can move forward and backward in the optical axis direction following the trajectory of the cam grooves.

In such a first group lens 1 eccentricity adjustment mechanism and thrust position adjustment mechanism, optical adjustment is performed from the side (radial direction) of the first group lens 1 to obtain the desired optical performance. Since the interchangeable lens 50 is required to maintain its optical performance, for example, when it is subjected to a strong impact or when it is exposed to high temperature and high humidity for a long time, after optical adjustment, each lens and each lens barrel are not only fixed with each roller but also glued. Conventionally, the bonding is performed from the front side of the lens holding member, that is, from the optical axis direction, and assembly is complicated compared to optical adjustment from the radial direction. Therefore, if the first group lens 1 is bonded from the side (radial direction), bonding can be performed in the same direction as optical adjustment, making assembly easier. However, when bonding parts to be adjusted together, the adhesive flows out of the space required for adjustment, and the adhesive is reduced, so that sufficient adhesive strength cannot be secured. Next, the configuration of the adhesive fixation in Example 1 and the adhesive structure that can prevent the adhesive from flowing out will be described.

The side surface of the first group adjustment ring 3 has an adhesive protrusion 3b (first protrusion) and an outflow prevention protrusion 3c (second protrusion) adjacent to each other along the optical axis. The adhesive protrusion 3b functions to increase the adhesive area and ensure sufficient adhesive strength, while the outflow prevention protrusion 3c functions as an outflow suppression section that prevents the outflow of adhesive A, which will be described later. The side surface of the first group base 4 has an adhesive pool 4a (first hole) in the shape of a through hole penetrating in the radial direction. Furthermore, a passage groove 4b (second hole) that communicates with the adhesive pool 4a is also provided along the optical axis.

The details of the adhesive structure will be described below while explaining part of the assembly (manufacturing method) of the interchangeable lens 50. By the process of storing the first group adjustment ring 3 in the first group base 4 along the optical axis, the adhesive pool 4a provided in the first group base 4 forms an adhesive pool with the outer peripheral surface of the first group adjustment ring 3 as the bottom. At that time, the adhesive protrusion 3b is placed in the adhesive pool 4a through the passage groove 4b, and the outflow prevention protrusion 3c is placed so as to be located in the passage groove 4b (placement process).

As described above, by providing the passage groove 4b that communicates with the adhesive pool 4a along the optical axis, when the first group adjustment ring 3 is stored in the first group base 4, the adhesive protrusion 3b can be placed in the adhesive pool 4a through the passage groove 4b. The adhesive pool 4a is filled with adhesive A (adhesive process), and the first group adjustment ring 3 is adhesively fixed to the first group base 4, but since the adhesive pool 4a is located on the side of the first group adjustment ring 3, the above optical adjustment and adhesion can be performed from the side (radial direction) of the first group lens 1, making assembly easier.

The adhesive reservoir formed as described above may be provided on either the first group base 4 or the first group adjustment ring 3, and the adhesive protrusion 3b may be provided on either the first group base 4 or the first group adjustment ring 3 where no adhesive reservoir is provided. Furthermore, the adhesive protrusion 3b passes through the passage groove 4b by moving from the object side of the interchangeable lens 50 to the imaging surface side or from the imaging surface side to the object side.

As described above, by providing the passage groove 4b that communicates with the adhesive pool 4a along the optical axis, the effect of making assembly easier is obtained, but there is a concern that the adhesive A may flow out from this passage groove 4b. However, by positioning the outflow prevention protrusion 3c in the passage groove 4b, the outflow of the adhesive A is prevented. Furthermore, after the adhesive protrusion 3b is placed in the adhesive pool 4a, the outflow prevention ring 39, which is an annular member, is attached from the outer circumferential surface of the first group base 4. The outflow prevention ring 39 is placed in the adhesive pool 4a so as to surround the adhesive protrusion 3b, and is positioned around the adhesive protrusion 3b, and functions as an outflow prevention member (outflow prevention portion) that prevents the adhesive A from flowing out.

Figure 5 is a perspective view showing a state in which the adhesive protrusion 3b is located in the adhesive pool 4a of the first group base 4, the outflow prevention ring 39 is installed, and adhesive A is not filled. Figure 6 is a partial cross-sectional view showing the adhesive structure in a state in which adhesive pool 4a is filled with adhesive A. In the bonding process, adhesive A is contained within the space formed by adhesive pool 4a, adhesive protrusion 3b, and outflow prevention protrusion 3c. Or, adhesive A is contained within the space formed by adhesive pool 4a, adhesive protrusion 3b, outflow prevention protrusion 3c, and outflow prevention ring 39.

The adhesive pool 4a is formed with stepped cylindrical sections 4d of different diameters in the depth direction (vertical direction in FIG. 6), and the small-diameter cylindrical section 4d holds the outflow prevention ring 39. The small-diameter cylindrical section 4d and the outflow prevention ring 39 have roughly the same outer diameter, and even if adhesive A is filled into this adhesive pool 4a, the gap between them is small, so that the adhesive A can be prevented from flowing out. On the other hand, as shown by arrow C, there is a certain gap between the outer shape of the adhesive protrusion 3b provided on the first group adjustment ring 3 and the inner diameter of the outflow prevention ring 39. This is the space for the first group adjustment ring 3 and the adhesive protrusion 3b to be relatively eccentric with respect to the outflow prevention ring 39 held in the adhesive pool 4a. Then, adhesive A enters this space and can firmly bond the adhesive protrusion 3b and the outflow prevention ring 39.

When the first group adjustment ring 3 is stored inside the first group base 4, the passage groove 4b through which the adhesive protrusion 3b passes is connected to the adhesive pool 4a, and the outflow prevention protrusion 3c is located inside the passage groove 4b. Therefore, when the adhesive pool 4a is filled with adhesive A, the outflow prevention protrusion 3c can block the adhesive A flowing into the passage groove 4b. Since the first group base 4 and the first group adjustment ring 3 are relatively eccentric, a space is required between the passage groove 4b and the outflow prevention protrusion 3c. However, since the adhesive A used is a so-called UV adhesive that hardens when irradiated with ultraviolet light and has a certain viscosity, outflow from the above space can be prevented by optimizing the work time until ultraviolet light is irradiated. If the outflow prevention protrusion 3c does not exist, the space created by the passage groove 4b would be too large, making it difficult to prevent outflow by simply optimizing the work time for irradiating ultraviolet light.

The outflow prevention ring 39 is in contact with the first group adjustment ring 3 as shown in FIG. 6 due to its own weight. Even if the first group adjustment ring 3 moves in the direction of gravity or in the vertical direction of the drawing due to the eccentricity adjustment mechanism, the outflow prevention ring 39 is held in contact with the first group adjustment ring 3 according to the movement of the first group adjustment ring 3. Therefore, even if the adhesive A flows to the bottom of the adhesive pool 4a, it is possible to prevent the adhesive A from flowing out from between the outflow prevention ring 39 and the first group adjustment ring 3. In addition, when considering preventing the adhesive A from flowing out from the adhesive pool 4a, it is possible to eliminate the adhesive protrusion 3b and the passage groove 4b required for its assembly, thereby minimizing the outflow space. However, if the adhesive protrusion 3b is eliminated, the adhesive area will be reduced accordingly, and there is a risk that the adhesive strength will not be sufficiently secured. Furthermore, if the adhesive protrusion 3b is made a separate member and is configured to be fixed to the first group adjustment ring 3 with a screw, for example, the passage groove 4b can be eliminated. In addition, this configuration can prevent the adhesive A from flowing out and ensure the adhesive strength, but there is a risk of increased costs and assembly man-hours due to the addition of a separate part. Furthermore, it is necessary to provide pilot holes for screws in the first group adjustment ring 3, and securing space for these pilot holes may result in an increase in the size of the first group barrel 2 and therefore the interchangeable lens 50. In other words, the configuration of Example 1 can be said to be an example of an optimal configuration that is small, has the minimum number of parts required, and can secure sufficient adhesive strength.

In addition, while the outflow prevention protrusion 3c in Example 1 is formed integrally with the first group adjustment ring 3, it may be formed integrally with the outflow prevention ring 39, for example. Since the outflow prevention ring 39 is assembled from the outside of the first group base 4, assembly consideration is required such as assembling it at a slight angle in order to insert the outflow prevention protrusion 3c into the passage groove 4b, but this is a possible configuration. In addition, a completely separate part, for example, a cushion material made of a material that can be deformed to fit the shape of the passage groove 4b, can be later fitted into the passage groove 4b, and there is no restriction on the configuration or form as long as the outflow prevention protrusion 3c functions to prevent the adhesive A from outflowing.

The configuration according to the first embodiment makes it easy to perform optical adjustments and fix components when assembling the first group adjustment ring 3 to the first group base 4. It also has the excellent effect of preventing the adhesive A used for fixing from leaking out.

Example 2
7 is a partial perspective view of a holding barrel 202 (holding member) having an adhesive structure according to Example 2 of the present invention. In Example 2, the lens 201 is provided in the holding barrel 202, and the holding barrel 202 and the base member are provided with a plurality of claws (not shown), which are fixed in a so-called bayonet manner in which the claws engage with each other by butting them against each other and rotating them in the direction of arrow B.

The adhesive pool 202a is formed as a through hole penetrating the optical axis direction on the flange surface of the holding barrel 202. The adhesive protrusion 204b and the outflow prevention protrusion 204c are formed on a base member (not shown) located on the back side of the holding barrel 202.

In the second embodiment, the bayonet method is adopted, so that the holding barrel 202 is fixed by rotating in the circumferential direction relative to the base member. In this configuration, in order to store the adhesive protrusion 204b in the adhesive pool 202a, the passage groove 202b (second hole portion) provided in the holding barrel 202 is a groove formed in the circumferential direction centered on the optical axis, not in the optical axis direction. The adhesive protrusion 204b passes through the passage groove 202b by moving in the circumferential direction centered approximately on the optical axis. After the holding barrel 202 and the base member are combined, the outflow prevention ring 39 can be assembled and bonded, and the configuration can prevent the adhesive A from flowing out as in the first embodiment. Although details are omitted, the holding barrel 202 is supported eccentrically relative to the base member with the above-mentioned claws engaged, and can be bonded after optical adjustment by eccentricity.

The configuration of Example 2 makes it easy to perform optical adjustments and fix components when assembling the bayonet-type holding barrel 202 to a base member. It also has the excellent effect of preventing the adhesive A used for fixing from leaking out.

The preferred embodiments 1 and 2 of the present invention have been described above, but the present invention is not limited to these embodiments 1 and 2, and various modifications and changes are possible within the scope of the gist of the invention. In addition, there are no limitations on the material as long as it takes into account the design function.

3. 1st group adjustment ring (holding member)
3b Adhesive protrusion (first protrusion)
3c Outflow prevention convex portion (second convex portion)
4. 1st group base (base member)
4a Adhesive pool (first hole)
4b, 202b Passage groove (second hole portion)
50 Interchangeable lenses (optical devices)
202 Holding barrel (holding member)
A. Adhesive

Claims (18)

A base member;
a holding member for holding the optical member,
one of the base member and the holding member is provided with a first hole portion penetrating in a radial direction of the optical member and a groove portion communicating with the first hole portion, and the other of the base member and the holding member is provided with a first convex portion passing through the groove portion and positioned in the first hole portion, and a second convex portion positioned in the groove portion ,
An optical device, characterized in that the base member and the holding member are bonded by an adhesive contained in the space formed by the first hole portion, the first convex portion, and the second convex portion. The optical device according to claim 1 , wherein the other of the base member and the holding member has the first convex portion and the second convex portion arranged side by side in a direction along the optical axis of the optical member. A base member;
a holding member for holding the optical member,
One of the base member and the holding member is provided with a first hole portion penetrating in a direction along the optical axis of the optical member, and a groove portion communicating with the first hole portion,
the other of the base member and the holding member is provided with a first convex portion that passes through the groove and is positioned in the first hole portion, and a second convex portion that is positioned in the groove portion,
An optical device, characterized in that the base member and the holding member are bonded by an adhesive contained in the space formed by the first hole portion, the first convex portion, and the second convex portion. The optical device according to claim 3 , wherein the other of the base member and the holding member has the first convex portion and the second convex portion provided along a circumferential direction centered on the optical axis. 5. The optical device according to claim 1, wherein the first hole is provided in the base member. 6. The optical device according to claim 1, wherein the first convex portion is provided on the holding member. 7. The optical device according to claim 1, wherein the second convex portion is provided on the holding member. 8. The optical device according to claim 1, wherein the first convex portion is made of a deformable material. 9. The optical device according to claim 1, further comprising an outflow suppression portion that suppresses outflow of the adhesive from between the base member and the holding member. The optical device according to claim 9 , wherein the outflow suppression portion includes an annular member located around the first convex portion. The optical device according to any one of claims 1 to 10, characterized in that it is detachable from the imaging device. An imaging device comprising the optical device according to any one of claims 1 to 11 and an imaging element that receives light from the optical device. A method for manufacturing an optical device including a base member and a holding member for holding an optical member, comprising the steps of:
One of the base member and the holding member is provided with a first hole portion penetrating the optical member in a radial direction and a groove portion communicating with the first hole portion,
the other of the base member and the holding member is provided with a first convex portion and a second convex portion,
an arrangement step of arranging the first protrusion in the first hole by passing the first protrusion through the groove and arranging the second protrusion in the groove ;
and a bonding step of filling an adhesive into a space formed by the first hole, the first convex portion, and the second convex portion. The manufacturing method according to claim 13 , wherein in the positioning step, the first convex portion is moved along an optical axis direction of the optical member to pass through the groove portion . A method for manufacturing an optical device including a base member and a holding member for holding an optical member, comprising the steps of:
One of the base member and the holding member is provided with a first hole portion penetrating in a direction along the optical axis of the optical member, and a groove portion communicating with the first hole portion,
the other of the base member and the holding member is provided with a first convex portion and a second convex portion,
an arrangement step of arranging the first protrusion in the first hole by passing the first protrusion through the groove and arranging the second protrusion in the groove;
and a bonding step of filling an adhesive into a space formed by the first hole, the first convex portion, and the second convex portion. 16. The manufacturing method according to claim 15 , wherein in the positioning step, the first convex portion is caused to pass through the groove portion by moving the first convex portion along a direction around the optical axis of the optical member. The manufacturing method according to any one of claims 13 to 16, characterized in that, between the positioning step and the bonding step, a step of providing an outflow suppression part that suppresses outflow of the adhesive from between the base member and the holding member is included. The manufacturing method described in claim 17, characterized in that the outflow suppression portion is an annular member, and in the step of providing the outflow suppression portion, the annular member is disposed around the first protrusion.

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