JP3792875B2 - Optical element holding device and optical apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical element holding device, and more particularly, to correct performance degradation caused by optical axis misalignment of a plurality of optical elements (lenses, etc.) due to manufacturing errors in an optical device such as an interchangeable lens for a single lens reflex camera. Therefore, the present invention relates to an optical element holding device suitable for correcting an optical axis shift of an optical element (change of relative positions of a plurality of optical elements in a direction perpendicular to the optical axis) performed in a manufacturing process.
[0002]
[Prior art]
The optical element holding device as described above is generally used conventionally. Hereinafter, a typical configuration and a method for correcting the optical axis deviation will be described.
[0003]
FIG. 3 shows an optical element holding device constituting a part of a conventional interchangeable lens for a single-lens reflex camera. In this figure, reference numeral 1 denotes a guide tube, which is held at a fixed position with respect to the film surface. The guide tube 1 is formed with a guide groove 1a extending in the optical axis direction.
[0004]
Reference numeral 2 denotes a cam cylinder, which is fitted and held on the outer diameter of the guide cylinder 1 so that only rotation around the optical axis is possible. A cam groove 2 a is formed in the cam cylinder 2.
[0005]
Reference numeral 3 denotes a first lens barrel that holds the first lens 5 and is fitted to the inner diameter of the guide tube 1 at the outer diameter portion thereof. The first lens barrel 3 is screwed with a roller 4 that engages with the guide groove 1a and the cam groove 2a. Accordingly, when the cam barrel 2 is rotated around the optical axis, the roller 4 is driven at the intersection of the guide groove 1a and the cam groove 2a, and the first lens barrel 3 moves in the optical axis direction.
[0006]
A second lens barrel 6 that holds the second lens 7 is in contact with the rear end surface of the arm portion that extends rearward in the optical axis direction of the first lens barrel 3 and is screwed to the arm portion by screws 9. Thus, when the first lens barrel 3 moves in the optical axis direction, the second lens barrel 6 also moves together.
[0007]
In the optical element holding device having such a configuration, the first lens barrel 3 and the second lens barrel 6 are not strictly positioned in the direction perpendicular to the optical axis, and only an approximate position within a certain range is obtained. It is decided. Thereby, the optical axis shift (eccentricity) of the first lens 5 and the second lens 7 due to the manufacturing error of each component is obtained by changing and adjusting the position of the second lens barrel 6 relative to the first lens barrel 3 in the optical axis orthogonal direction. It can be assembled by modifying.
[0008]
Next, an optical axis deviation correcting method in the manufacturing process of the optical element holding device will be described. In the adjustment, the guide tube 1 is fixed to an adjustment jig body (not shown) in a state before the screws of the second lens barrel 6 and the first lens barrel 3 with the screws 9, and the adjustment ring 8a, the biasing ring 8b, An adjustment jig 8 composed of an urging spring 8c is set. In this state, the adjustment ring 8a is fitted to the outer diameter of the lens holding portion of the second barrel 6 and is movable in the direction perpendicular to the optical axis with respect to the adjustment jig body. The biasing ring 8b is fitted to the inner diameter of the adjustment ring 8a, and is biased toward the second lens barrel 6 by a biasing spring 8c disposed between the biasing ring 8a and the adjustment ring 8a.
[0009]
For this reason, the second lens barrel 6 is held in a state in which it is pressed against the first lens barrel 3 by the urging ring 8b, that is, in a state in which the distance between the first lens barrel 3 and the second lens barrel 6 in the optical axis direction is determined. The
[0010]
Then, by moving the adjustment ring 8a in the direction orthogonal to the optical axis, the second lens barrel 6 can be moved to a desired position in the direction orthogonal to the optical axis, and the optical axis deviation can be corrected. In this way, the second lens barrel 6 is moved to the position where the optical axis deviation of both the lenses 5 and 7 is corrected using the adjusting jig 8, and then the screw 9 is tightened, whereby the first lens barrel 3 and the second lens barrel 6 are tightened. The tube 6 can be coupled with no optical axis deviation.
[0011]
[Problems to be solved by the invention]
However, the conventional optical axis deviation correcting method has the following drawbacks.
[0012]
First, since the second lens barrel 6 is biased with respect to the first lens barrel 3 by the biasing ring 8b, this biasing force is applied to the first lens barrel 3, the cam groove 2a, the roller 4, and the like. The optical axis deviation is corrected in a state where the first lens barrel 3 and the roller 4 have been deformed by being added to the abutting portion. Accordingly, when the biasing by the biasing ring 8b is released, these deformations return to the original state and the optical axis is shifted again. In fact, it can be said that the true optical axis shift can be accurately corrected. hard.
[0013]
Secondly, the correction accuracy is deteriorated due to the deformation of the parts generated when the screw 9 is tightened. For example, in the first lens barrel 3, deformation around the screw 9 due to the tightening frictional force of the screw 9 (particularly when a self-tapping screw is used) occurs. Also in the second lens barrel 6, deformation around the screw 9 is also generated by the frictional force caused by the head of the screw 9. If the adjustment jig 8 is removed while these deformations are still occurring, the second lens barrel 6 will move in a direction to relieve the stress caused by these deformations, which is also true light. It is hard to say that the axis deviation can be corrected with high accuracy.
[0014]
Thirdly, the correction accuracy similarly deteriorates due to the deformation of the first lens barrel 3 due to the frictional force generated on the contact surface between the first lens barrel 3 and the second lens barrel 6 during the correction of the second lens barrel 6. Is a problem.
[0015]
Therefore, an object of the present invention is to provide an optical element holding device that can correct an optical axis deviation with a simple configuration with high accuracy.
[0016]
[Means for Solving the Problems]
  In order to achieve the above object, in the present invention,A first holding member that holds the first optical element and has a plurality of extending portions extending in the optical axis direction, a second holding member that holds the second optical element, and the plurality of extending portions and the second holding member And a plurality of coupling members that allow the relative positions of the two holding members to be changed in the middle of the coupling, and between the coupling members and the second holding member, at least of the two holding members by the coupling members A plurality of urging members for pressing and urging the second holding member against the first holding member in the middle of the coupling, and one member attached to the plurality of extending portions, Reinforcing member that reinforces deformationAre provided to form an optical element holding device.
[0017]
Thus, the distance between the first optical element and the second optical element in the optical axis direction can be determined without using an adjustment jig that presses and urges the second holding member against the first holding member from the outside as in the prior art. In addition, it is possible to correct the optical axis deviation with high accuracy by preventing the deformation of parts.
[0018]
  AlsoIn the optical element holding device,A reinforcing member that is attached to the plurality of extending portions and that reinforces deformation of each extending portion.TheProvidedSoWhen changing the relative position of both holding members and when connecting the connecting membersFirst holding memberEach extension ofPrevents deterioration of optical axis misalignment correction accuracy due to deformationCan.
  Also,Reinforcement memberArranged between the coupling member and the second holding member to couple the coupling memberTimePrevents the frictional force between the coupling member and the second holding member from being generatedlikeDue to the deformation of the second holding member.RuIt is desirable to prevent deterioration in accuracy of optical axis deviation correction. And in this caseReinforcementAgainst the first holding member of the memberOptical axis orthogonal directionMove inPreventionThus, it is desirable that the movable portion can be configured integrally with both holding members even after the assembly.
[0019]
  further,The biasing member and the coupling memberReinforcementPlaced between membersShiTherefore, it is desirable to prevent the deformation of the parts efficiently with a simple configuration.
  In the present invention, the first holding member that holds the first optical element and has a plurality of extending portions extending in the optical axis direction, the second holding member that holds the second optical element, and the plurality of extending portions A plurality of coupling members for coupling the portion and the second holding member and allowing the relative position of the both holding members to be changed in the middle of the coupling, and one member attached to the plurality of extending portions, An optical element holding device is configured by providing a reinforcing member that reinforces the deformation of each extending portion.
  Furthermore, in the present invention,,A first holding member that holds the first optical element, extends in the optical axis direction, and includes a plurality of extending portions each having a first screw hole, and holds the second optical element, and the plurality of extending parts A second holding member having a flange portion having a second screw hole at a position corresponding to the first screw hole of each of the portions, and the first holding member disposed on the opposite side of the first holding member with respect to the second holding member A plurality of screws for screwing the member and the second holding member, and a plurality of screws arranged between each of the plurality of screws and the second holding member to press and urge the second holding member against the first holding member. A biasing member and a third member having a third screw hole at a plurality of locations corresponding to the plurality of screws and attached to the plurality of extending portions, and An optical element holding device is configured by providing a reinforcing member that performs reinforcement.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 shows an internal structure of an interchangeable lens (optical apparatus) for a single-lens reflex camera provided with a lens holding device (optical element holding device) according to the first embodiment of the present invention. This interchangeable lens is a six-group lens having first to sixth group lenses L1 to L6, and all the lenses L1 to L6 move in the optical axis direction by the zoom operation, and the second group lens L2 by the focus operation. Moves in the direction of the optical axis.
[0021]
At this time, the third lens unit L3 and the sixth lens unit L6 move integrally, and the fifth lens unit L5 moves in the direction orthogonal to the optical axis in order to perform a shake correction operation separately from the movement in the optical axis direction. Also move.
[0022]
A mount 101 has a bayonet portion to be attached to the camera body, and is fixed to the fixed cylinder 102 with screws. Reference numeral 103 denotes an exterior ring, which is sandwiched and fixed between the mount 101 and the fixed cylinder 102.
[0023]
A scale window 104, a name plate 105, and a SW panel 106 are attached to the exterior ring 103. By switching a switch provided on the SW panel 106, functions such as autofocus and shake correction are selected and used. be able to.
[0024]
Reference numeral 107 denotes a guide tube, and the fixed tube 102 is screwed to constitute a fixed portion with respect to the camera body. A cam cylinder 108 that can only rotate around the optical axis by bayonet coupling is fitted to the outer periphery of the guide cylinder 107. Thus, when the cam cylinder 108 is rotated, the third group holding the third group lens L3 is moved according to the movement of the intersection of the guide groove in the optical axis direction provided in the guide cylinder 107 and the cam groove provided in the cam cylinder 108. The holding frame 109, the fourth group holding frame 110 that holds the fourth group lens L4, the shake correction unit 111, and the rectilinear cylinder 112 can be moved in the optical axis direction via rollers 113 to 116 that are screwed to each.
[0025]
The third group holding frame 109 is screwed with an electromagnetic diaphragm unit 117 composed of a diaphragm driving section and a diaphragm blade section. At the rear end of the third group holding frame 109, a sixth group holding frame 118 for holding the sixth group lens L6 is screwed together with the reinforcing plate 119 and the spring washer 120 by screws 145.
[0026]
A hook portion is provided at the front end of the fourth group holding frame 110, and a moving diaphragm 121 for the purpose of determining an open aperture and cutting harmful light is elastically coupled to the hook portion from the front. This facilitates the coupling of the movable diaphragm 121 and the fourth group holding frame 110 with the third group holding frame 109 sandwiched therebetween.
[0027]
The shake correction unit 111 holds the fifth group lens L5 so that the fifth group lens L5 can be driven in a direction orthogonal to the optical axis, and drives the fifth group lens L5 by a driving unit including a magnet and a coil.
[0028]
A filter frame 122 is screwed to the straight cylinder 112.
[0029]
A bayonet portion is provided on the outer periphery of the front end of the filter frame 122, and a screw portion is provided on the inner periphery thereof, so that accessories such as a hood and a filter can be attached thereto. Further, a first group holding frame 123 that holds the first group lens L1 is screwed to the filter frame 122.
[0030]
The contact portions of the filter frame 122 and the first group holding frame 123 are each formed in a slope shape extending in the circumferential direction, and the first group holding frame 123 is attached to the filter frame 122 by rotating the first group holding frame 123. The attachment position in the optical axis direction with respect to the filter frame 122 can be selected. Thereby, it is possible to correct the shift of the focal position between the wide-angle side and the telephoto side due to a manufacturing error.
[0031]
Reference numeral 124 denotes a decorative ring, on which a display such as a lens name is printed.
[0032]
A focus unit 125 is screwed to the guide tube 107. The focus unit 125 mainly includes a vibration wave motor and a differential mechanism, and outputs the rotation amount of the focus key 127 according to the rotor rotation amount of the vibration wave motor and the rotation amount of the manual ring 126.
[0033]
On the front side of the focus unit 125, a gyro substrate 129 to which a pair of vibration gyros 128 for detecting angular velocities in horizontal and vertical directions are soldered is screwed via a rubber damper (not shown).
[0034]
In addition, an encoder flex 130 on which a gray code pattern is formed is affixed to the outer periphery of a protruding portion that extends in an arc from the focus unit 125.
[0035]
Further, a protrusion is provided at a phase where the vibration gyro 128 and the encoder flex 130 are not provided on the front side of the focus unit 125, and a roller 131 is screwed to the protrusion.
[0036]
Reference numeral 132 denotes a zoom operation ring. By engaging the roller 131 with a groove provided in the circumferential direction, only rotation around the optical axis is possible in a state where movement in the optical axis direction is restricted. On the inner periphery of the zoom operation ring 132, a recess is provided for engaging a zoom key 133 screwed to the cam barrel 108. Accordingly, the cam barrel 108 can be rotated integrally with the zoom operation ring 132 via the zoom key 133.
[0037]
Reference numeral 134 denotes an intermediate cylinder, and on the outer periphery there is a protrusion that engages with a groove extending in the optical axis direction provided on the inner periphery of the zoom operation ring 132, and on the inner periphery there is a protrusion provided on the outer periphery of the filter frame 122. Engaging lead grooves are provided. For this reason, it rotates integrally with the zoom operation ring 132 and advances and retreats in the optical axis direction according to the position of the zoom operation ring 132 in the rotation direction and the position of the filter frame 122 in the optical axis direction.
[0038]
In this interchangeable lens, the vibration gyro 128 is disposed at a position away from the camera body (in front of the focus unit 125), so that vibrations generated by the camera body (shutter curtain running, mirror up / down vibration, etc.) are vibration gyro. It has a structure that is difficult to be transmitted to 128, and does not require a conventionally used technique such as housing in a case. Further, by providing the position restricting portion in the optical axis direction of the zoom operation ring 132 at a phase where the vibration gyro 128 is not provided, the vibration gyro can be arranged without increasing the lens outer diameter. By these methods, the interchangeable lens is reduced in size.
[0039]
A zoom rubber 135 is wound around the outer periphery of the zoom operation ring 132, and a name ring 136 is elastically coupled to the front end portion of the zoom operation ring 132. Reference numeral 137 denotes a zoom brush screwed to the zoom operation ring 132, which is used to detect the positional relationship between the zoom operation ring 132 and the encoder flex 130 by sliding on the gray code pattern of the encoder flex 130.
[0040]
Reference numeral 138 denotes an inner cam cylinder, and a roller 139 is screwed through a coil spring. This roller 139 engages with a cam groove provided in the guide cylinder 107 and an optical axis direction groove provided in the cam cylinder 108. For this reason, the inner cam cylinder 138 advances and retreats in the optical axis direction while rotating integrally with the cam cylinder 108.
[0041]
Reference numeral 140 denotes a second group holding frame for holding the second group lens L2, and a protrusion provided on the outer periphery engages with a cam groove provided on the inner periphery of the inner cam cylinder 138. The key portion extending from the second group holding frame 140 is engaged with the focus key 127 so as to rotate integrally.
[0042]
For this reason, when the cam cylinder 108 rotates (the focus key 127 is stopped), the second group holding frame 140 has an engagement point associated with the rotation of the inner cam cylinder 138 in the optical axis direction and the cam groove of the inner cam cylinder 138. It advances and retreats in the optical axis direction by the total amount of change in the optical axis direction.
[0043]
Further, when the focus key 127 is rotated (the cam cylinder 108 is stopped), the focus key 127 moves forward and backward according to the amount of change in the optical axis direction of the engagement point with the cam groove of the inner cam cylinder 138 while rotating. In this interchangeable lens, by these mechanisms, the focal position shift accompanying the change in focal length in the inner focus is mechanically corrected, and the second group lens L2 is advanced and retracted in the optical axis direction.
[0044]
Reference numeral 141 denotes a scale sheet that rotates integrally with the focus key 127 that is the output of the focus unit 125 and displays the focus position together with the scale window 104.
[0045]
Reference numeral 142 denotes a main board, which is electrically connected to the focus unit 125, the electromagnetic diaphragm unit 117, the shake correction unit 111, the gyro board 129, and the encoder flexible board 130 via the flexible flexible board, or performs various controls.
[0046]
A contact block 143 is screwed to the mount 101 and connected to the main board 142 via a flexible board, and is provided for communication with the camera body and power supply.
[0047]
Reference numeral 144 denotes a back cover that elastically couples to the mount 101 to cut harmful light. In the interchangeable lens configured as described above, when the zoom operation ring 132 is rotated, the cam cylinder 108 is rotated via the zoom key 133, and all the lenses L1 to L6 are advanced and retracted in the optical axis direction according to the above mechanism, and zooming is performed. Is done. At this time, the third lens unit L3 and the sixth lens unit L6 advance and retract integrally.
[0048]
On the other hand, the focus key 127 is rotated by driving the vibration wave motor during auto focus and by rotating the manual ring 126 during manual focus. Accordingly, the second group lens L2 can be advanced and retracted according to the above mechanism to perform focusing.
[0049]
Further, during the shake correction operation, the shake correction unit 111 is controlled according to the output of the vibration gyro 128 and the output of the encoder flex 130, and the fifth lens group L5 is placed on the plane perpendicular to the optical axis, and the film surface due to the generated shake. Drive in the direction to cancel the movement of the image at.
[0050]
Next, the configuration of the lens holding device that holds and integrally connects the third and sixth lens groups L3 and L6 will be described in detail with reference to FIG. In this lens holding device, among the components described with reference to FIG. 1, before mounting the mount 101, the exterior ring 103, the manual ring 126, the main board 142, the back cover 144, and the parts fixed thereto, the fixed cylinder 102 is mounted. A sixth group holding frame (second holding member referred to in the claims) 118 holding the sixth group lens L6 is held by the third group lens L3 while being fixed to an adjustment jig body (not shown). An optical axis orthogonal direction position is adjusted and attached to the third group holding frame (same as the first holding member) 109.
[0051]
Thereby, it is possible to correct the deterioration of the optical performance caused by the manufacturing error of the first to sixth lens groups L1 to L6 and the respective components that hold them, and to obtain the desired optical performance.
[0052]
  The third group holding frame 109 extends from the cylindrical part holding the third group lens L3 to the rear of the lens via the flange part.That is, the optical axis directionThree feet extending to(Extending part in the claims)109a. At the rear end of each leg 109a, a contact surface 109b with a sixth group holding frame which is an optical axis orthogonal surface, a screw pilot hole 109d and a pair of columnar projections 109c are provided.
[0053]
There are three groups holding frame 109 and three groups at positions corresponding to the contact surface 109b of the third group holding frame 109 and the screw pilot hole 109d on the outer periphery of the cylindrical portion that holds the sixth group lens L6 of the sixth group holding frame 118. The flange part 118a provided with the contact surface and the screw hole 118b is formed.
[0054]
  Reinforcing plate (referred to in the claims)ReinforcementMember) 119,It extends to connect the three legs 109aIt has a generally hollow disk shape.Just one memberScrew holes 119a, round holes 119b, and elongated holes 119c are provided at three positions corresponding to the screw prepared holes 109d and the cylindrical projection 109c of the third group holding frame 109, respectively.
[0055]
The lens holding device constituted by these parts is assembled as follows. First, the flange portion 118 a of the sixth group holding frame 118 is abutted against the contact surface 109 b of the third group holding frame 109. Next, in the state where the reinforcing plate 119 is placed on the flange portion 118a of the sixth group holding frame 118, a self-tapping screw (attached to the claim) with a spring washer (an urging member referred to in the claims) 120 attached around the screw shaft portion. It is screwed in three places by a connecting member 145 in the range.
[0056]
Next, in the correction of the optical axis in the present lens holding device, the screw 145 is tightened halfway, that is, the sixth group holding frame 118 cannot be completely fixed to the third group holding frame 109. Thus, the sixth group holding frame 118 is pressed against the third group holding frame 109 via the reinforcing plate 119 (in the middle of connection in the claims).
[0057]
An adjustment jig (not shown) corresponding to the conventional adjustment ring 8 a is attached to the sixth group holding frame 118. Then, the sixth group holding frame 118 is moved in the plane orthogonal to the optical axis through the adjustment jig.
[0058]
Here, the diameter of the screw hole 118b of the sixth group holding frame 118 is set to be larger than the outer diameter of the screw shaft portion of the screw 145 so that the sixth group holding frame 118 can be moved by an estimated necessary deviation correction amount. ing.
[0059]
Further, the amount of protrusion t1 in the rear in the optical axis direction with respect to the contact surface 109b at the base position of the cylindrical protrusion 109c of the third group holding frame 109 and the thickness t2 of the flange portion 118a of the sixth group holding frame 118 are t1 <t2. Are in a relationship. For this reason, the distance between the third group lens L3 and the sixth group lens L6 in the optical axis direction can be determined by reliably pressing the sixth group holding frame 118 against the third group holding frame 109 via the reinforcing plate 119.
[0060]
  Further, the cylindrical projections 109c provided on the three legs 109a of the third group holding frame 109 are fitted into the round holes 119b and the long holes 119c of the reinforcing plate 119, whereby the reinforcing plate 119 is attached to the third group holding frame 109. With respect to the optical axis correction surfaces of both holding frames 109 and 118 (referred to in the claims)Optical axis orthogonalAnd the deformation of the legs 109a of the third group holding frame 109 are also restricted. For this reason, the reinforcing plate 119 is integrated with the third group holding frame 109 (further, the sixth group holding frame 118), and can constitute a movable part as a whole.
[0061]
As described above, in the lens holding device of the present embodiment, the sixth group holding frame 118 is tightened by the spring force of the spring washer 120 while the screw 145 for coupling the sixth group holding frame 118 to the third group holding frame 109 is tightened. The sixth group holding frame 118 can be moved in the direction perpendicular to the optical axis with respect to the third group holding frame 109 in order to correct the optical axis deviation in a state where the optical axis direction interval of the third group holding frame 109 is determined Has been. For this reason, as shown in FIG. 3, there is no problem that each component is deformed by the external biasing force (the biasing force by the biasing ring 8b and the biasing spring 8c) by the adjusting jig. Can be corrected with high accuracy.
[0062]
The specific configuration of the present invention is not limited to that described in the present embodiment. For example, if space is allowed, the spring force by the spring washer 120 can be generated at a position different from the position under the screw 145, and the positions of the spring washer 120 and the reinforcing plate 119 are interchanged. It may be configured. Further, instead of the spring washer 120, it is also possible to use a component having spring properties such as a disc spring, a corrugated washer, a leaf spring, and a coil spring.
[0063]
In the lens holding device of this embodiment, when the screw 145 is tightened, the screw shaft portion of the screw 145 and the screw lower hole 109d of the third group holding frame 109 or the head of the screw 145 and the sixth group holding frame 118 are fixed. Friction force generated between the flange portion 118a or the third group holding frame due to the friction force generated on the contact surface 109b when the sixth group holding frame 118 is moved in the direction perpendicular to the optical axis with respect to the third group holding frame 109. The deformation / twisting of the 109 leg portions 119a and the twisting of the flange portion 118a of the sixth group holding frame 118 are prevented as follows.
[0064]
First, the third group holding frame due to the friction force generated between the screw shaft portion of the screw 145 and the screw prepared hole 109d of the L3 holding frame 109 or the contact surface between the sixth group holding frame 118 and the third group holding frame 109. The deformation and twisting of the 109 leg 109a is prevented by restricting the deformation of the leg 109a by the reinforcing plate 119.
[0065]
  Second, regarding the twist of the flange portion 118a due to the frictional force generated between the head of the screw 145 and the flange portion 118a of the sixth group holding frame 118, the relative movement with the third group holding frame 109 is restricted. By sandwiching the reinforcing plate 119 therebetween, the generation of the frictional force is prevented by limiting it between the reinforcing plate 119 and the screw 145..
[0066]
In addition, separate deformation prevention members may be provided for each component deformation factor, and frictional force is generated and transmitted by sandwiching a part having a low coefficient of friction such as a Teflon sheet separately from the deformation prevention member. May be prevented.
[0067]
【The invention's effect】
As described above, according to the present invention, the holding member is held between the coupling member and the second holding member, that is, by the urging force of the urging member disposed inside the apparatus, on both holding members during correction of the optical axis deviation. Since the distance between the optical elements is determined, it is possible to prevent the deformation of parts as in the case of using an adjustment jig that applies an urging force from the outside as in the prior art, and to correct the optical axis deviation with high accuracy. be able to.
[0068]
  Also, the reinforcing memberProvidedBecause,When changing the relative position of both holding members and when connecting the connecting membersFirst holding memberEach extension ofIt is possible to prevent the optical axis deviation correction accuracy from deteriorating due to the deformation.
[0069]
  Also,Reinforcement memberBetween the coupling member and the second holding memberSet inif,By friction between the coupling member and the second holding memberIt can also be prevented that the optical axis misalignment correction accuracy deteriorates due to the deformation of the second holding member.
[0070]
  And in this caseReinforcementRelative position change surface of both holding members with respect to the first holding member(Optical axis orthogonal plane)If the movement inside is restricted, the movable part can be configured integrally with both holding members even after the assembly.
[0071]
  further,The biasing member and the coupling memberReinforcementArranged between membersPutThen, it is possible to efficiently prevent the deformation of the parts with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an interchangeable lens for a single-lens reflex camera according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a structure of a lens holding device provided in the interchangeable lens.
FIG. 3 is a partial cross-sectional view illustrating a method of correcting an optical axis deviation in a lens holding device provided in a conventional interchangeable lens for a single-lens reflex camera.
[Explanation of symbols]
107 Guide tube
108 Cam cylinder
109 Group 3 holding frame
110 4 group holding frame
111 Shake correction unit
112 Straight cylinder
117 Electromagnetic throttle unit
118 6-group holding frame
119 Reinforcement plate
120 Spring washer
122 Filter frame
123 Group 1 holding frame
125 focus unit
138 Inner cam cylinder
140 2-group holding frame

Claims (10)

A first holding member which holds the first optical element to have a plurality of extending portions which extend in the optical axis direction,
A second holding member for holding the second optical element;
A plurality of coupling members which permit changing the relative position of the two holding members in the middle bond with to couple the second holding member and the plurality of the extending portion,
Wherein disposed between the second holding member and each coupling member, a plurality of presses and biases the second holding member at the middle coupling of the two holding members by at least the coupling member with respect to the first holding member and a biasing member,
An optical element holding device comprising: a member attached to the plurality of extending portions, and a reinforcing member that reinforces deformation of the extending portions .   The optical element holding device according to claim 1, wherein the coupling member is a screw that couples the both holding members by tightening.   The optical element holding device according to claim 2, wherein the urging member is an annular member arranged around the axis of the screw. The optical element holding device according to any one of claims 1 to 3, wherein the reinforcing member is disposed between the plurality of coupling members and the plurality of extending portions . The optical element holding device according to any one of claims 1 to 3, wherein the biasing member is disposed between each of the coupling members and the reinforcing member. Wherein the reinforcing member, the optical element holding apparatus according to the arrangement of any one of claims 1 to 5, wherein between the second holding member and the plurality of coupling members. The optical element holding device according to any one of claims 1 to 6 , wherein the reinforcing member is prevented from moving in a plane orthogonal to the optical axis with respect to the first holding member. A first holding member that holds the first optical element and has a plurality of extending portions extending in the optical axis direction;
A second holding member for holding the second optical element;
A plurality of coupling members for coupling the plurality of extending portions and the second holding member and allowing a change in the relative positions of the both holding members in the middle of the coupling;
An optical element holding apparatus comprising: a member attached to the plurality of extending portions, and a reinforcing member that reinforces deformation of the extending portions. A first holding member that holds the first optical element and includes a plurality of extending portions each extending in the optical axis direction and having a first screw hole;
A second holding member that holds a second optical element and includes a flange portion having a second screw hole at a position corresponding to the first screw hole of each of the plurality of extending portions;
A plurality of screws that are disposed on the opposite side of the first holding member with respect to the second holding member, and that screw the first holding member and the second holding member;
A plurality of urging members disposed between each of the plurality of screws and the second holding member to press and urge the second holding member against the first holding member;
A reinforcing member that has third screw holes at a plurality of locations corresponding to the plurality of screws and is attached to the plurality of extending portions, and that reinforces the deformation of the extending portions; An optical element holding device comprising: An optical apparatus characterized by using the optical element holding device according to any one of claims 1-9.

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