JP2021036279A - Optical device and imaging apparatus - Google Patents

Abstract

To provide an optical device that can be easily assembled, and an imaging apparatus using the same.SOLUTION: An interchangeable lens includes a first group base 4, a first group adjustment ring 3 supporting an optical member, and adhesive bonding the first group base 4 and the first group adjustment ring 3. One of the first group base 4 and the first group adjustment ring 3 is provided with an adhesion pond 4a and a passage groove 4b communicating with the adhesion pond 4a. The other of the first group base 4 and the first group adjustment ring 3 is provided with an adhesion protrusion 3b located within the adhesion pond 4a and an outflow prevention protrusion 3c located within the passage groove 4b. The adhesive is accommodated in a space formed by the adhesion pond 4a, the adhesion protrusion 3b and the outflow prevention protrusion 3c.SELECTED DRAWING: Figure 4

Description

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

In an optical device provided with an optical member such as a lens, it is required to prevent the positional deviation of the optical member due to an impact or environmental change.

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. Then, the lens holding member is fixed by an adhesive in which the convex portion provided on the lens holding member is located inside the through hole portion provided on the base member and is filled around the convex portion in the through hole portion. It is made by curing.

JP-A-2018-97228

However, in the optical device described in Patent Document 1, while the adjustment tool is inserted from the side surface side of the lens holding member to perform optical adjustment, the lens holding member and the base member are fixed by an adhesive from the front side of the lens holding member. Assembling was complicated because it was done by. Further, if the means for fixing the lens holding member and the base member is simply arranged on the side surface side of the lens holding member, the convex portion provided on the lens holding member can be arranged inside the through hole portion provided on the base member. could not.

An object of the present invention is to provide an optical device that can be easily assembled and an imaging device using the same.

In order to achieve the above object, the optical device includes a base member, a holding member for holding the optical member, and an adhesive for adhering the base member and the holding member, and among the base member and the holding member. One is provided with a first hole and a second hole communicating with the first hole, and the other of the base member and the holding member is of the first hole. A first convex portion located inside and a second convex portion located in the second hole portion are provided, and the adhesive is applied to the first hole portion and the first hole portion. It is characterized in that it is accommodated in the space formed by the convex portion and the second convex portion.

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

FIG. 5 is a cross-sectional view of the interchangeable lens 50 according to the first embodiment in a state in which the total length is shortened (TELE). It is sectional drawing of the state (WIDE) in which the total length of the interchangeable lens 50 which concerns on Example 1 is extended. It is a system block diagram of the interchangeable lens 50 of Example 1 and a camera body. It is an exploded perspective view of the member which concerns on the 1st group lens barrel 2 of the interchangeable lens 50 of Example 1. FIG. It is a perspective view of the group 1 base 4 of the interchangeable lens 50 of Example 1. FIG. It is a partial cross-sectional view of the adhesive structure of the interchangeable lens 50 of Example 1. FIG. It is a partial perspective view of the holding lens barrel 202 of Example 2. FIG.

(Example 1)
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the optical axis direction indicated by the alternate long and short dash line in the drawing, the object side of the interchangeable lens 50 (optical device) provided with the lens which is an optical member is the front side, and the fixed side (imaging surface side) fixed to the camera body 70 by the bayonet. Is defined as the rear side. The interchangeable lens 50 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a cross-sectional view of the interchangeable lens 50 in a state of TELE in which the total length of the interchangeable lens 50 is reduced. FIG. 2 is a cross-sectional view of the interchangeable lens 50 in a WIDE state in which the total length of the interchangeable lens 50 is extended. The group 1 lens 1 which is an optical member is held by the group 1 lens barrel 2. The 1st group lens barrel 2 is held by the 1st group adjustment ring 3, and the 1st group adjustment ring 3 moves the 1st group lens barrel 2 on the plane in the direction perpendicular to the optical axis direction and the optical axis direction for optical adjustment. Let me. The 1st group lens barrel 2 and the 1st group adjustment ring 3 are held by the 1st group base 4. The interchangeable lens 50 has a plurality of optical members as described below, and the group 1 adjusting ring 3 is a holding member that holds at least a part of the plurality of optical members.

The straight cylinder 5 is formed with a screw portion for attaching a filter (not shown) on the object side. The straight cylinder 5 and the group 1 lens 1 move in and out as a unit with the zoom operation, but in the first embodiment, they are supported by different support structures (not shown) and move. The specifications of the interchangeable lens 50 and the like are printed on the decorative ring 6, and the decorative ring 6 is fixed to the straight cylinder 5 with screws and has an appearance.

The second group lens 7 (focus lens) is held by the second group lens barrel 8, and the second group lens barrel 8 is moved along the optical axis direction by a drive mechanism (ultrasonic motor unit 30) and a straight-ahead guidance mechanism (not shown). It is supported and moved so that it can move forward and backward, and a focusing operation is performed. This straight-ahead guidance mechanism uses two cylindrical members extending in the optical axis direction, so-called guide bars, one of which determines the tilt / eccentricity of the second group lens barrel 8 and the other the optical axis. Determine the rotation position around. The second group lens barrel 8 is supported so that it can move forward and backward along the guide bar.

The 3-group lens 9 is held by the 3-group lens barrel 10. The 4-group lens 11 is held by the 4-group lens barrel 12, and the 4-group lens barrel 12 corrects so-called camera shake by moving the 4-group lens 11 on a plane perpendicular to the optical axis direction. It fulfills the optical anti-vibration function. The actuator for producing this optical vibration isolation function is a so-called voice coil motor, but a detailed description of its configuration is omitted.

The 5-group lens 13 is held by the 5-group lens barrel 14, and the 6-group lens 15 is held by the 6-group lens barrel 16. The 5th group lens barrel 14 is fixed to the 6th group lens barrel 16 with a screw (not shown). Each of the lens groups described above is not configured as one lens, but may be composed of a plurality of lens groups, but the details are omitted for convenience of explanation.

The aperture unit 17 for adjusting the amount of light is fixed to the group 4 lens barrel 12 and has a plurality of light-shielding blades. Then, a plurality of light-shielding blades of the diaphragm unit 17 are driven by a stepping motor (not shown) as a drive source, and a desired F value can be obtained. The above-mentioned 3rd group lens barrel 10 is sandwiched between the aperture unit 17 integrally fixed to the 4th group lens barrel 12 and the 4th group lens barrel 12, but can be moved in the optical axis direction.

The sub-aperture unit 18 that cuts a predetermined flare light is supported by a group 4 lens barrel 12, and has a plurality of light-shielding blades inside like the aperture unit 17. Then, a plurality of light-shielding blades of the sub-aperture unit 18 are driven by a mechanical connection mechanism (not shown), and it is possible to change the plurality of light-shielding blades into an opening shape corresponding to the zoom positions of TELE to WIDE.

A guide cylinder 19 is provided, and a cam ring 20 rotatably engaged with the outer peripheral side of the guide cylinder 19 is further provided. A front fixing cylinder 22 is provided on the object side, a rear fixing cylinder 21 is provided on the camera body 70 side, and the front fixing cylinder 22 is fixed to the front side of the rear fixing cylinder 21 with screws. Further, a printed circuit board 23 on which a guide cylinder 19, an appearance cylinder 24, a mount 25, a lens driving IC, a microcomputer, and the like are arranged is fixed to the rear fixing cylinder 21.

A switch (not shown) capable of switching between MF⇔AF and IS mode is arranged on the outer peripheral surface of the appearance cylinder 24 fixed to the rear fixing cylinder 21 with screws. Further, a back cover 27 is fixed to the mount 25 fixed to the rear fixing cylinder 21 with screws, and a light-shielding line for cutting harmful light is arranged on the inner surface thereof. The mount cylinder 26 is sandwiched and fixed between the rear side fixing cylinder 21 and the mount 25, and like the back cover 27, a light-shielding line is arranged on the inner surface thereof. In the interchangeable lens 50 of the first embodiment, the focusing position on the image pickup unit 78 (image sensor) can be adjusted by changing the thickness of the mount cylinder 26 in the optical axis direction by processing or the like. The contact block 28 is connected to the printed circuit board 23 by a wiring (flexible board or the like) (not shown), and is fixed to the mount 25 with screws.

The MF ring unit 29 is rotatably supported at a fixed position about the front fixed cylinder 22 as an axis. When the MF ring unit 29 is rotated, a sensor (not shown) detects the rotation, drives the second group lens barrel 8 according to the amount of rotation, and controls focusing of the second group lens 7.

The ultrasonic motor unit 30 is a drive source for the second group lens barrel 8, and can move by itself by the ultrasonic vibration generated by the piezoelectric element. The group 2 lens barrel 8 and the ultrasonic motor unit 30 are engaged by a connecting mechanism (not shown), and the group 2 lens barrel 8 can move together with the ultrasonic motor unit 30. The light-shielding wall (not shown) attached to the lens barrel 8 switches the light-shielding / light-transmitting of the photo-interrupter (not shown), and the light-shielding / light-transmitting is electrically detected. The advancing / retreating position (reference position) of the lens barrel 8 is grasped. By moving the group 2 lens barrel 8 by a predetermined amount from this reference position, it is possible to move the lens barrel 8 to a desired focusing position.

The first base 31 of the second group lens 7 holds one end of the guide bar constituting the straight-ahead guidance mechanism described above. The second base 32 of the second group lens 7 holds the other end of the guide bar, the ultrasonic motor unit 30, and the photo interrupter. That is, the guide bar is sandwiched between the first base 31 and the second base 32 and fixed at a predetermined position.

The function ring unit 33 is rotatably supported at a fixed position about the front fixed cylinder 22 as an axis. After the function ring unit 33 is incorporated, the front cover 34 is screw-fixed to the front fixing cylinder 22 as a presser for the function ring unit 33. Similar to the MF ring unit 29, the rotation amount of the function ring unit 33 is detected by a sensor (not shown). In the first embodiment, the aperture unit 17 can be controlled by the detected value and changed to an arbitrary F value. It is also possible to assign changes in shooting conditions different from the F value, such as ISO sensitivity and shutter speed, to the function ring unit 33.

The manual zoom ring 35 is rotatably supported by the rear fixed cylinder 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) of each lens group will be described. On the second base 32 of the 1st group base 4 that holds the 1st group lens barrel 2 and the 1st group adjustment ring 3, the 3rd group lens barrel 10, the 2nd group lens barrel 8 and the 2nd group lens 7 that holds the ultrasonic motor unit 30. Each of the rollers (not shown) is arranged, and these rollers engage with the cam ring 20.

As described above, the 4th group lens barrel 12 is equipped with an actuator and an auxiliary aperture unit 18 for exerting an optical anti-vibration function, but a diaphragm unit 17 arranged in front of the 3rd group lens barrel 10 is also mounted. Has been done. Rolls (not shown) are arranged on the 6-group lens barrel 16 that holds the 4-group lens barrel 12 and the 5-group lens barrel 14, and these rollers engage with the cam ring 20.

These rollers are engaged with cam grooves (not shown) provided on the cam ring 20 having different trajectories. The cam groove has a locus such that each lens group optically has a desired lens spacing at a desired zoom position. As the cam ring 20 rotates around the optical axis, the 1st group base 4, the 3rd group lens barrel 10, the 4th group lens barrel 12, the 6th group lens barrel 16 and the 2nd base 32 are retracted to the TELE position shown in FIG. It can be arranged at the extended WIDE position shown in FIG. 2 and at any zoom position in between.

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

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

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

FIG. 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. Further, 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 electric contact 52 and the camera-side electric contact 72. The information (signal) transmitted by the camera CPU 71 to the lens CPU 51 includes drive amount information, parallel runout information, and focus runout information of the second group lens 7. Further, the information (signal) transmitted from the lens CPU 51 to the camera CPU 71 includes imaging magnification information. The lens-side electrical contact 52 and the camera-side electrical contact 72 include a contact 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 supplying power to each actuator, sensor, or the like 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. The signal from the release switch 74 is input to the camera CPU 71. The camera CPU 71 enters the shooting preparation state in response to the input of the ON signal from the first stroke switch SW1. In the shooting preparation state, the photometric unit 75 measures the subject brightness and the focus detection unit 76 performs focus detection.

The camera CPU 71 calculates the aperture value of the aperture unit 17 and the exposure amount (shutter seconds) of the image sensor of the image pickup unit 78 based on the photometric result of the photometric unit 75. Further, the camera CPU 71 is a two-group lens 7 for obtaining a focused state with respect to the subject based on the focus information (defocus amount and defocus direction) which is the detection result of the focus state of the photographing optical system by the focus detection unit 76. And the drive amount (including the drive direction) of the second group lens barrel 8 is determined. The drive amount information (drive amount information of the second group lens 7) is transmitted to the lens CPU 51. The lens CPU 51 controls the operation of each component of the interchangeable lens 50.

Further, the camera CPU 71 starts the shift drive of the second group lens barrel 8, that is, the control of the vibration isolation operation when the predetermined shooting mode is set. When the ON signal from the second stroke switch SW2 is input, the camera CPU 71 transmits an aperture drive command to the lens CPU 51, and sets the aperture unit 17 to the previously calculated aperture value. Further, the camera CPU 71 transmits an exposure start command to the exposure unit 77 to perform an operation of retracting a mirror (not shown) and an operation of opening a shutter (not shown), and the image sensor of the image sensor 78 performs photoelectric conversion of the subject image. That is, the exposure operation is performed.

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

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

The IS drive unit 55 includes a drive actuator of the second group lens barrel 8 that performs vibration isolation operation and a drive circuit thereof. The AF drive unit 56 performs AF drive of the second group lens barrel 8 through an AF motor (ultrasonic motor unit 30) according to the drive amount information of the second group lens 7 transmitted from the camera CPU 71.

The electromagnetic aperture drive unit 57 is controlled by the lens CPU 51 that receives an aperture drive command from the camera CPU 71 to operate the aperture unit 17 in an open state corresponding to a 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 velocities of the vertical (pitch direction) runout and the lateral (yaw direction) runout, which are the angular velocities 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 direction and the yaw direction from the angular velocity sensor 58, and the amount of displacement in each direction, the amount of runout in the pitch direction and the amount of runout in the yaw direction (collecting these). Is called the amount of angular velocity.)

The lens CPU 51 controls the IS drive unit 55 based on the combined displacement amount of the above-mentioned angular runout amount and parallel runout amount to shift drive the second group lens barrel 8 to perform angle runout correction and parallel runout correction. Further, the lens CPU 51 controls the AF drive unit 56 based on the amount of focus shake to drive the group 2 lens barrel 8 in the optical axis direction to correct the focus shake.

Next, the group 1 lens 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 desired optical performance by eccentricizing or tilting some lenses or moving them along the optical axis direction. As one of the optical adjustment mechanisms, there are an eccentricity adjustment mechanism and a thrust position adjustment mechanism of the 1st group lens 1 of the 1st group lens barrel 2. FIG. 4 is an exploded perspective view of a member related to the group 1 lens barrel 2. The configuration of the group 1 lens barrel 2 will be described in detail with reference to FIG.

The thrust adjustment cam 3a is a through hole provided in the group 1 adjustment ring 3 and having a lead along the rotation direction about the optical axis of the group 1 adjustment ring 3. After the first group lens barrel 2 is housed inside the first group adjustment ring 3, three thrust adjustment rollers 37 are evenly arranged at 120 ° in the circumferential direction of the first group lens barrel 2 and are mounted on the thrust adjustment cam 3a. Engage. Then, each thrust adjusting roller 37 is fixed to the group 1 lens barrel 2 by a screw 37a. By rotating the 1st group lens barrel 2, each thrust adjustment roller 37 moves along the lead of the thrust adjustment cam 3a, and the 1st group lens barrel 2 is relatively along the optical axis with respect to the 1st group adjustment ring 3. Can be moved. The thrust position adjusting mechanism is configured by the thrust adjusting cam 3a and the thrust adjusting roller 37.

The eccentricity adjusting groove 4c is a substantially rectangular through hole provided in the group 1 base 4. After the group 1 adjusting ring 3 is housed inside the group 1 base 4, three eccentric rollers 38 are evenly arranged at 120 ° in the circumferential direction of the group 1 adjusting ring 3 and are arranged in the eccentric adjustment groove 4c. Engage. Then, each eccentric roller 38 is fixed to the group 1 adjusting ring 3 by the screw 38a. The eccentricity adjusting groove 4c of the first embodiment has a substantially rectangular shape having a length in the optical axis direction, and the eccentric diameter portion of the eccentric roller 38 and the width in the lateral direction thereof engage with each other. When the eccentric roller 38 rotates in the eccentric adjustment groove 4c about the eccentric diameter portion, the cylindrical portion on the side of the group 1 adjustment ring 3 having a center different from the rotation center operates eccentrically with respect to the rotation. Utilizing this eccentric operation, the 1st group adjustment ring 3 is eccentric relative to the 1st group base 4, and the 1st group lens barrel 2 and the 1st group lens 1 fixed to the 1st group adjustment ring 3 are obtained. It can be eccentric with respect to the optical axis. Since such an eccentricity adjusting mechanism using the eccentric roller 38 is common as a configuration of the interchangeable lens 50, detailed operation and details of the eccentric roller shape will be omitted, and only the above description will be given.

The group 1 roller 36 is fixed 120 ° evenly in the circumferential direction of the group 1 base 4 with screws (not shown), and by engaging with the cam groove provided on the cam ring 20, the group 1 base 4 is cammed. It is possible to move forward and backward in the optical axis direction following the trajectory of the groove.

In such an eccentricity adjusting mechanism and a thrust position adjusting mechanism of the 1st group lens 1, optical adjustment is performed from the side surface side (radial direction) of the 1st group lens 1 in order to obtain desired optical performance. The interchangeable lens 50 is required to maintain its optical performance when, for example, a strong impact is applied or when it is exposed to high temperature and high humidity for a long period of time. Not only each lens barrel is fixed by each roller, but also adhesive fixing is performed. Conventionally, the bonding is performed from the front side of the lens holding member, that is, from the optical axis direction, and the assembly is complicated with respect to the optical adjustment from the radial direction. Therefore, if the group 1 lens 1 is bonded from the side surface side (diameter direction), the bonding can be performed in the same direction as the optical adjustment, so that the assembly can be facilitated. However, when the parts to be adjusted are bonded to each other, the adhesive may flow out from the space required for the adjustment and the adhesive may be reduced, so that sufficient adhesive strength may not be ensured. Next, the structure of the adhesive fixing of Example 1 and the adhesive structure capable of preventing the outflow of the adhesive will be described.

On the side surface of the group 1 adjusting ring 3, an adhesive convex portion 3b (first convex portion) and an outflow prevention convex portion 3c (second convex portion) are provided adjacent to each other along the optical axis. The adhesive convex portion 3b functions to increase the adhesive area and sufficiently secure the adhesive strength, and the outflow prevention convex portion 3c functions as an outflow suppressing portion for preventing the outflow of the adhesive A described later. An adhesive pond 4a (first hole portion) in the shape of a through hole penetrating in the radial direction is provided on the side surface of the group 1 base 4. Further, a passage groove 4b (second hole) communicating with the adhesive pond 4a is also provided along the optical axis.

Hereinafter, the details of the adhesive structure will be described while explaining a part of assembling (manufacturing method) the interchangeable lens 50. By the step of accommodating the 1st group adjusting ring 3 in the 1st group base 4 along the optical axis, the adhesive pond 4a provided in the 1st group base 4 forms an adhesive pool portion with the outer peripheral surface of the 1st group adjusting ring 3 as the bottom. To do. At that time, the adhesive convex portion 3b is arranged in the adhesive pond 4a through the passage groove 4b, and the outflow prevention convex portion 3c is arranged so as to be located in the passage groove 4b (arrangement step).

As described above, by providing the passage groove 4b communicating with the adhesive pond 4a along the optical axis, the adhesive convex portion 3b passes through the passage groove 4b when the group 1 adjusting ring 3 is housed in the group 1 base 4. It becomes possible to arrange it in the adhesive pond 4a. The adhesive pond 4a is filled with the adhesive A (adhesive step), and the group 1 adjusting ring 3 is adhesively fixed to the group 1 base 4, but the adhesive pond 4a is arranged on the side surface side of the group 1 adjusting ring 3. Therefore, the above-mentioned optical adjustment and adhesion can be performed from the side surface side (radial direction) of the group 1 lens 1, and the assembly becomes easy.

The adhesive pool formed as described above may be provided on one of the group 1 base 4 and the group 1 adjusting ring 3, and the adhesive convex portion 3b is not provided with the adhesive pool. It suffices if it is provided in one of the group 1 base 4 and the group 1 adjusting ring 3. Further, the adhesive convex portion 3b passes through the passage groove 4b by moving from the object side of the interchangeable lens 50 to the image pickup surface side or from the image pickup surface side to the object side.

As described above, by providing the passage groove 4b communicating with the adhesive pond 4a along the optical axis, the effect of facilitating assembly can be obtained, but the adhesive A may flow out from the passage groove 4b. I am concerned. However, since the outflow prevention convex portion 3c is located in the passage groove 4b, the outflow of the adhesive A is prevented. Further, after the adhesive convex portion 3b is arranged in the adhesive pond 4a, the outflow prevention ring 39, which is an annular member, is attached from the outer peripheral surface of the group 1 base 4. The outflow prevention ring 39 is arranged in the adhesive pond 4a so as to surround the adhesive convex portion 3b, is located around the adhesive convex portion 3b, and functions as an outflow suppression member (outflow suppression portion) for preventing the outflow of the adhesive A. ..

FIG. 5 is a perspective view showing a state in which the adhesive convex portion 3b is located in the adhesive pond 4a of the group 1 base 4, the outflow prevention ring 39 is incorporated, and the adhesive A is not filled. FIG. 6 is a partial cross-sectional view showing an adhesive structure in a state where the adhesive pond 4a is filled with the adhesive A. In the bonding step, the adhesive A is housed in the space formed by the bonding pond 4a, the bonding convex portion 3b, and the outflow prevention convex portion 3c. Alternatively, the adhesive A is housed in the space formed by the adhesive pond 4a, the adhesive convex portion 3b, the outflow prevention convex portion 3c, and the outflow prevention ring 39.

The adhesive pond 4a is formed by forming a stepped cylinder portion 4d having a different diameter in the depth direction (vertical direction in FIG. 6), and the outflow prevention ring 39 is held by the cylinder portion 4d having a small diameter. The outer diameters of the small-diameter tubular portion 4d and the outflow prevention ring 39 are approximately the same, and even if the adhesive pond 4a is filled with the adhesive A, the gap between them is small, so that the outflow of the adhesive A is prevented. it can. On the other hand, as shown by an arrow C, there is a certain gap between the outer shape of the adhesive convex portion 3b provided on the group 1 adjusting ring 3 and the inner diameter of the outflow prevention ring 39. This is a space for the group 1 adjusting ring 3 and the adhesive convex portion 3b to be relatively eccentric with respect to the outflow prevention ring 39 held in the adhesive pond 4a. Then, the adhesive A enters this space, and the adhesive convex portion 3b and the outflow prevention ring 39 can be firmly adhered to each other.

When the 1st group adjusting ring 3 is housed inside the 1st group base 4, the passing groove 4b through which the adhesive convex portion 3b passes communicates with the adhesive pond 4a, but the outflow prevention is prevented inside the passing groove 4b. The convex portion 3c is located. Therefore, when the adhesive A is filled in the adhesive pond 4a, the adhesive A flowing into the passage groove 4b can be blocked by the outflow prevention convex portion 3c. Since the group 1 base 4 and the group 1 adjusting ring 3 are relatively eccentric, a space is required between the passage groove 4b and the outflow prevention convex portion 3c. However, the adhesive A used is a so-called UV adhesive that sticks when irradiated with ultraviolet rays and has a constant viscosity. Therefore, by optimizing the working time until irradiation with ultraviolet rays, the adhesive flows out from the above space. Can be prevented. If the outflow prevention convex portion 3c is not provided, the space provided by the passage groove 4b is too large, and it is difficult to prevent the outflow only by optimizing the working time for irradiating the ultraviolet rays.

Further, the outflow prevention ring 39 is in contact with the group 1 adjusting ring 3 due to its own weight as shown in FIG. Even if the group 1 adjusting ring 3 moves in the direction of gravity or in the vertical direction in the drawing by the eccentricity adjusting mechanism, the outflow prevention ring 39 is held in contact with the movement of the group 1 adjusting ring 3. Therefore, even if the adhesive A flows to the bottom of the adhesive pond 4a, the outflow of the adhesive A from between the outflow prevention ring 39 and the group 1 adjusting ring 3 can be prevented. When considering prevention of the outflow of the adhesive A from the adhesive pond 4a, it is conceivable to eliminate the adhesive convex portion 3b and the passage groove 4b required for incorporating the adhesive convex portion 3b to minimize the outflow space. However, if the adhesive convex portion 3b disappears, the adhesive area decreases by that amount, and there is a possibility that sufficient adhesive strength cannot be secured. Further, if the adhesive convex portion 3b is used as a separate member and is fixed to the group 1 adjusting ring 3 with screws, the passage groove 4b can be eliminated. Even with this configuration, the outflow of the adhesive A can be prevented and the adhesive strength can be ensured, but there is a risk that the cost and the assembly man-hours will increase due to the addition of another part. Further, it is necessary to provide a screw pilot hole for fixing the screw in the group 1 adjusting ring 3, and in order to secure a space for the pilot hole, the size of the group 1 lens barrel 2 and thus the interchangeable lens 50 is increased. There is also a risk. That is, it can be said that the configuration of the first embodiment is an example of an optimum configuration that is small in size, has the minimum necessary parts, and can secure a sufficient adhesive force.

Further, although the outflow prevention convex portion 3c of Example 1 is integrally formed with the group 1 adjusting ring 3, for example, it may be integrally formed with the outflow prevention ring 39. Since the outflow prevention ring 39 is incorporated from the outside of the group 1 base 4, the outflow prevention convex portion 3c is inserted into the passage groove 4b, so that assembly consideration such as slightly tilting the assembly is required. It is possible. Further, for example, a cushion material made of a material that can be deformed according to the shape of the passage groove 4b, which is a completely different component, may be fitted into the passage groove 4b afterwards, and the adhesive A may flow out as the outflow prevention convex portion 3c. If it fulfills the function of preventing the above, it does not regulate its composition and form.

According to the configuration according to the first embodiment, when the group 1 adjusting ring 3 is assembled to the group 1 base 4, the optical adjustment and the fixing of the members can be facilitated. Further, it has an excellent effect that the outflow of the adhesive A used for fixing can be prevented.

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

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

In the second embodiment, since the bayonet method is adopted, the holding lens barrel 202 is fixed by rotating in the circumferential direction with respect to the base member. For such a configuration, in order to store the adhesive convex portion 204b in the adhesive pond 202a, the passage groove 202b (second hole portion) provided in the holding lens barrel 202 does not have an optical axis direction but an optical axis. It is a groove formed in the circumferential direction around the center. Then, the adhesive convex portion 204b passes through the passage groove 202b by moving in the circumferential direction about the optical axis. After the holding lens barrel 202 and the base member are combined, the outflow prevention ring 39 can be assembled and adhered, and the same configuration as in the first embodiment can prevent the outflow of the adhesive A. .. Further, although details are omitted, the holding lens barrel 202 is eccentrically supported with respect to the base member in the state where the above-mentioned claws are engaged, and can be adhered after optical adjustment by eccentricity. ..

According to the configuration according to the second embodiment, when the holding lens barrel 202 adopting the bayonet method is assembled to the base member, optical adjustment and fixing of the member can be facilitated. Further, it has an excellent effect that the outflow of the adhesive A used for fixing can be prevented.

Although the preferred examples 1 and 2 of the present invention have been described above, the present invention is not limited to these examples 1 and 2, and various modifications and changes can be made within the scope of the gist thereof. Further, the material is not limited as long as the material considers the design function.

3 Group 1 adjustment ring (holding member)
3b Adhesive convex part (first convex part)
3c Outflow prevention convex part (second convex part)
4 Group 1 base (base member)
4a Adhesive pond (first hole)
4b, 202b Tongguogou (second hole)
50 Interchangeable lens (optical device)
202 Holding lens barrel (holding member)
A adhesive

Claims (15)

With the base member
A holding member that holds the optical member and
The base member and the adhesive for adhering the holding member are provided.
One of the base member and the holding member is provided with a first hole portion and a second hole portion communicating with the first hole portion.
The other of the base member and the holding member is provided with a first convex portion located in the first hole portion and a second convex portion located in the second hole portion. Has been
An optical device, wherein the adhesive is housed in a 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 first hole portion is provided in the base member. The optical device according to claim 1 or 2, wherein the first convex portion is provided on the holding member. The optical device according to any one of claims 1 to 3, wherein the second convex portion is provided on the holding member. The optical device according to any one of claims 1 to 4, wherein the first convex portion is made of a deformable material. The optical device according to any one of claims 1 to 5, further comprising an outflow suppressing portion that suppresses the outflow of the adhesive from between the base member and the holding member. The optical device according to claim 6, wherein the outflow suppressing portion includes an annular member located around the first convex portion. The optical device according to any one of claims 1 to 7, wherein the optical device is removable from the image pickup device. An image pickup apparatus comprising the optical apparatus according to any one of claims 1 to 8 and an image pickup element that receives light from the optical apparatus. A method of manufacturing an optical device including a base member and a holding member for holding the optical member.
One of the base member and the holding member is provided with a first hole portion and a second hole portion communicating with the first hole portion.
The other of the base member and the holding member is provided with first and second convex portions.
An arrangement step of arranging the first convex portion in the first hole portion and arranging the second convex portion in the second hole portion.
A manufacturing method comprising a bonding step of filling an adhesive into a space formed by the first hole portion, the first convex portion, and the second convex portion. The feature is that the first convex portion is arranged in the first hole portion by moving the first convex portion so as to pass through the second hole portion in the arrangement step. The manufacturing method according to claim 10. The manufacturing method according to claim 11, wherein in the arrangement step, the first convex portion is moved along the optical axis direction of the optical member to pass through the second hole portion. The manufacturing method according to claim 11, wherein in the arrangement step, the first convex portion is moved along the direction around the optical axis of the optical member to pass through the second hole portion. .. 10.13 of claims 10 to 13, wherein an outflow suppressing portion for suppressing the outflow of the adhesive from between the base member and the holding member is provided between the arrangement step and the bonding step. The manufacturing method according to any one of the items. The manufacturing method according to claim 14, wherein the outflow suppressing portion is an annular member, and in the step of providing the outflow suppressing portion, the annular member is arranged around the first convex portion.

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