JP4924631B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel, an imaging device, and a manufacturing method.

Patent Document 1 below describes a zoom lens barrel structure in which a plurality of lens groups are individually moved by a cam mechanism to change a focal length.
JP 2000-089086 A

  The above structure has a complicated structure in which a large number of members are combined, and it is difficult to maintain the assembly accuracy between the members. In addition, maintainability after completion was low.

  In order to solve the above problems, as a first aspect of the present invention, an optical system having at least a first optical component (L3), a second optical component (L4), and a third optical component (L5) in order. (101), a first guide bar (192) extending in parallel with the optical axis of the optical system, and an insertion portion (92) through which the first guide bar passes, and the first optical component and the third optical A holding cylinder (91) that is movable along the first guide bar while holding the components, and a holding frame (80) that is arranged on the inner peripheral side of the holding cylinder and holds the second optical component, There is provided a lens barrel (100) having an opening (99) of a size capable of inserting the holding frame to the inner peripheral side on the peripheral surface of the holding cylinder.

  As a second aspect of the present invention, there is provided an imaging device (300) including the lens barrel and an imaging unit (200) that captures an image formed by the lens barrel.

  Furthermore, as a third aspect of the present invention, there is provided a method for manufacturing the lens barrel, the step of holding at least one of the first optical component and the third optical component on a holding tube, and the second optical component. A step of holding the holding frame; a step of inserting the holding frame into the holding cylinder through an opening formed on the peripheral surface of the holding cylinder; and a second optical component and a second optical axis component on the inner peripheral side of the holding cylinder And a third optical component are arranged in order along the central axis of the holding cylinder, and a method of manufacturing a lens barrel including a step of inserting a guide bar through the holding cylinder and the holding frame.

  The above summary of the present invention does not enumerate all necessary features of the present invention. Further, a sub-combination of these feature groups can be an invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  1 and 2 are sectional views of the lens barrel 100, and FIG. 3 is a partially exploded perspective view of the lens barrel 100. FIG. The lens barrel 100 includes five groups of lenses L1, L2, L3, L4, and L5 that are sequentially arranged on a common optical axis X. The lenses L1, L2, L3, L4, and L5 are held by lens frames 159, 189, 70, 80, and 90, respectively. The lens barrel 100 is a zoom lens. FIG. 1 shows a state where the focal length of the lens barrel 100 is at the wide-angle end, and FIG. 2 shows a state where the focal length of the lens barrel 100 is at the telephoto end. FIG. 3 shows a state in which the configuration related to the assembly 10 of the lenses L3, L4, and L5 in the configuration of the lens barrel 100 is disassembled.

  The lens barrel 100 includes a fixed cylinder 110 that is fixed to the imaging unit 200 including an image sensor and the like. The fixed cylinder 110 has a cylindrical shape as a whole, and has a mount 112 coupled to the imaging unit 200 at the base 111 at the rear end. When the lens barrel 100 is coupled to the imaging unit 200, the mount surface 113 on the rear end surface of the fixed cylinder 110 is positioned in close contact with the front surface of the imaging unit 200.

  In the following description, unless otherwise specified, the movement in the direction parallel to the optical axis X with respect to the fixed cylinder 110 is referred to as “straight forward”, and the rotation around the optical axis X is referred to as “rotation”. In the lens barrel 100, the direction parallel to the optical axis X is “front and rear”, the imaging unit 200 side is “rear side” (image plane side), and the other end side is “front” (object side).

  An inner cylinder 141, a middle cylinder 140, an outer cylinder 150, and a zoom ring 130 that are coaxial with each other are arranged in this order from the inside on the outer periphery of the front end side of the fixed cylinder 110. On the inner peripheral side of the fixed cylinder 110, a cam cylinder 160 is disposed so as to be rotatable and linearly movable with respect to the fixed cylinder 110. An interlocking ring 170 that is rotatable and linearly movable with respect to the fixed cylinder 110 is disposed at the front end of the fixed cylinder 110 from the inner peripheral side of the cam cylinder 160 to the outer peripheral side of the fixed cylinder 110.

  The zoom ring 130 is mounted so as to be operated and rotated from the outside when performing a zooming operation. The zoom ring 130 has a linear guide groove 132 extending in the optical axis X direction on the inner surface.

  The middle cylinder 140 has a cam follower 142 that engages with the guide groove 132 of the zoom ring 130 so as to protrude outward. The inner peripheral surface of the middle cylinder 140 has an engagement groove 148 for guiding the inner cylinder 141 so as to be arranged around the optical axis X. The peripheral surface of the middle cylinder 140 has a cam groove 144 that guides the outer cylinder 150 so as to be inclined with respect to the optical axis X. Further, the peripheral surface of the middle cylinder 140 has a straight groove 146 that guides relative movement with the cam cylinder 160. The middle cylinder 140 is rotated at the time of zooming, and the straight groove 146 is at a position that does not appear in the sectional view of FIG.

  The inner cylinder 141 has an engagement protrusion 149 that engages with the engagement groove 148 of the middle cylinder 140 so as to protrude outward. The fixed cylinder 110 has a linear elongated hole 114 arranged in the optical axis X direction, and the cam follower 147 of the inner cylinder 141 passes through the elongated hole 114. Further, the inner cylinder 141 has a straight groove 143 that guides the outer cylinder 150 in cooperation with the cam groove 144 of the middle cylinder 140. Further, the inner cylinder 141 has a clearance hole 145 at least partially facing the straight groove 146 of the middle cylinder 140.

  The outer cylinder 150 has a cam follower 152 that engages with the cam groove 144 of the middle cylinder 140 and the straight groove 143 of the inner cylinder 141 so as to protrude toward the inner peripheral side. Further, the front end of the outer cylinder 150 is coupled to a lens frame 159 that holds the lens L1.

  The interlocking ring 170 has a cam follower 172 for guiding relative movement with the cam cylinder 160 so as to be arranged on the inner peripheral side of the cam cylinder 160. Further, the interlocking ring 170 has a straight groove 176 that guides the straight movement of the interlocking ring 170 so as to be arranged on the outer peripheral side of the fixed cylinder 110. The interlocking ring 170 holds the lens frame 189 that holds the lens L2 on the inner peripheral side.

  The cam cylinder 160 has cam grooves 161, 163, 164, and 166 arranged so as to be inclined with respect to the optical axis X. The cam follower 172 of the interlocking ring 170 is engaged with the cam groove 161. The cam cylinder 160 is formed with three cam grooves 161 having the same shape so as to be evenly arranged around the optical axis X. 1 and 2 show only one cam follower 172, it is preferable to correspond to the number of cam grooves 161. The number of cam grooves 161 is preferably two or three. As will be described later, the cam groove 163 gives a straight driving force to the lens L4, and the cam groove 164 gives a straight driving force to the lens L3 and the lens L5. A cam pin 116 disposed on the inner peripheral surface of the fixed cylinder 110 is engaged with the cam groove 166 to give the cam cylinder 160 a straight driving force for the fixed cylinder 110.

  In addition, a cam follower 162 protruding outward in the radial direction is fixed to the front end of the cam cylinder 160 via a connecting member 165. The cam follower 162 passes through the escape hole 145 of the inner cylinder 141 and engages with the straight groove 146 of the middle cylinder 140.

  A focus ring 120 is rotatably arranged on the outer periphery of the fixed cylinder 110 near the rear side. A cavity forming the motor chamber 115 is formed on the inner peripheral side of the focus ring 120. A motor (not shown) is accommodated in the motor chamber 115.

  One end of the transmission member 122 is disposed inside the motor chamber 115. The front end portion 124 of the transmission member 122 is disposed in the straight groove 176 of the interlocking ring 170. The transmission member 122 is selectively driven from either the focus ring 120 or the motor, and rotates the interlocking ring 170 along the outer periphery of the fixed cylinder 110. In FIG. 3, illustration of the outer peripheral portion forming the motor chamber 115 is omitted.

  Next, a pair of guide bars 192 and 194 disposed in parallel with the optical axis X are disposed on the inner peripheral side of the cam cylinder 160. In the following description, the guide bar 192 side from the optical axis X is “upper” and the guide bar 194 side from the optical axis X is “lower” unless otherwise specified.

  One end of each of the guide bars 192 and 194 is supported by an annular support portion 118 disposed at the rear end of the inner periphery of the fixed cylinder 110 and is disposed symmetrically with respect to the optical axis X. The lens frames 70, 80, 90 are movably supported by guide bars 192, 194.

  The lens frames 70 and 90 are coupled to each other by an interlocking cylinder 91 extending in the direction of the optical axis X. The interlocking cylinder 91 has a lens frame 90 that holds the lens L5 at the rear end and a lens frame 70 that holds the lens L3 at the front end.

  The lens frame 70 has a flange portion 72 that holds the outer edge of the lens L3 and extends in the radial direction of the lens L3. Accordingly, the lens frame 70 has an outer diameter substantially equal to the outer diameter of the interlocking cylinder 91 and can be coupled to the front end of the interlocking cylinder 91.

  A lens frame 80 that holds the lens L4 is arranged on the inner periphery of the interlocking cylinder 91 so as to be able to go straight in the interlocking cylinder 91. Here, FIG. 4 is a diagram illustrating a process of arranging the lens frame 80 on the inner peripheral side of the interlocking cylinder 91. 5 is a diagram showing a state in which the lens frame 80 is disposed on the inner peripheral side of the interlocking cylinder 91, and is a cross-sectional view taken along the line AA in FIG.

  The lens frame 80 has a pair of fitting portions 82 that fit into the guide bar 192 and an engaging portion 84 that engages with the guide bar 194 on the outer peripheral surface. Each of the pair of fitting portions 82 has a round hole-like fitting hole 83 into which the guide bar 192 can be inserted.

  The fitting hole 83 has an inner diameter substantially equal to the outer diameter of the guide bar 192, and the pair of fitting portions 82 are held by the guide bar 192 so as to be able to move straight forward. The lens frame 80 is guided while being restricted from tilting with respect to the guide bar 192 because the pair of fitting portions 82 are arranged at intervals in the extending direction of the guide bar 192.

  The engaging portion 84 has a U-shaped groove 85 including a pair of parallel surfaces that sandwich the guide bar 194. Since the lens frame 80 includes the fitting portion 82 and the engaging portion 84 on the outer peripheral surface, the lens frame 80 is restricted from rotating around the guide bar 192.

  Further, the lens frame 80 has a cam follower 86 that engages with the cam groove 163 of the cam cylinder 160 in the vicinity of the fitting portion 82 on the outer peripheral surface. The cam follower 86 is attached after the interlocking cylinder 91 including the lens frame 80 is disposed inside the cam cylinder 160, and penetrates the cam cylinder 160 while engaging with the cam groove 163 of the cam cylinder 160. Attached to the outer peripheral surface of the lens frame 80.

  The interlocking cylinder 91 has an escape hole 97 on the upper peripheral surface that allows the fitting portion 82 and the cam follower 86 of the lens frame 80 to protrude to the outside and allows the fitting portion 82 and the cam follower 86 to move relatively straight. In addition, the interlocking cylinder 91 has an insertion hole 99 on the lower peripheral surface through which the lens frame 80 passes when the lens frame 80 is inserted to the inner peripheral side of the interlocking cylinder 91.

  The interlocking cylinder 91 has a pair of fitting portions 92 fitted on the guide bar 192 on the outer peripheral surface. Each fitting part 92 has a round hole-like fitting hole 93 into which the guide bar 192 can be inserted. The fitting hole 93 has an inner diameter substantially equal to the outer diameter of the guide bar 192, and the pair of fitting portions 92 are held by the guide bar 192 so as to be able to move straight forward. Since the pair of fitting portions 92 are arranged at intervals in the extending direction of the guide bar 192, the interlocking cylinder 91 is guided while being restricted from tilting with respect to the guide bar 192.

  Further, the interlocking cylinder 91 has an engaging portion 94 that engages with the guide bar 194 on the outer peripheral surface. The engaging portion 94 has a U-shaped groove 95 including a pair of parallel surfaces that sandwich the guide bar 194. Since the interlocking cylinder 91 has the fitting part 92 and the engaging part 94 on the outer peripheral surface, the interlocking cylinder 91 is restricted from rotating around the guide bar 192.

  The interlocking cylinder 91 has a cam follower 96 that engages with the cam groove 164 of the cam cylinder 160 on the outer peripheral surface in the vicinity of the fitting portion 92. The cam follower 96 is attached after the interlocking cylinder 91 is disposed inside the cam cylinder 160, and penetrates the cam cylinder 160 and engages with the outer peripheral surface of the interlocking cylinder 91 while engaging the cam groove 164 of the cam cylinder 160. Installed.

  The pair of fitting portions 92 are arranged so as to sandwich the clearance hole 97 in the optical axis X direction on the upper outer peripheral surface of the interlocking cylinder 91. Since the fitting portion 82 of the lens frame 80 protrudes from the escape hole 97, the fitting portion 82 of the lens frame 80 and the fitting portion 92 of the interlocking cylinder 91 can be arranged side by side in the optical axis X direction. One guide bar can penetrate the fitting portions 82 and 92.

  The engaging portion 94 is formed so as to overlap with a region where the insertion hole 99 is formed when the interlocking cylinder 91 is viewed from the optical axis X direction. Since the engaging portion 84 of the lens frame 80 protrudes from the insertion hole 99, the engaging portion 84 of the lens frame 80 and the engaging portion 94 of the interlocking cylinder 91 can be arranged side by side in the optical axis X direction. One guide bar can engage with the engaging portions 84 and 94.

  With these structures, the lens frames 70 and 90 and the lenses L3 and L5 held by the lens frames 70 and 90 move integrally along the guide bars 192 and 194. Further, the lens frame 80 and the lens L4 move along the guide bars 192 and 194 separately from the interlocking cylinder 91 on the inner peripheral side of the interlocking cylinder 91. The cam follower 86 of the lens frame 80 engages with a cam groove 163 different from the cam groove 164 with which the cam follower 96 of the interlocking cylinder 91 is engaged.

  In order to form the cam groove 163 and the cam groove 164 in the cam cylinder 160, the cam follower 86 of the lens frame 80 and the cam follower 96 of the interlocking cylinder 91 have the fitting portions 82 and 92 when viewed from the optical axis X direction. It is preferable to arrange between them. For this reason, the relief hole 97 extends to the opposite side of the cam follower 96 of the interlocking cylinder 91.

Here, the lens frame 80 has an outer diameter D ₈₀ that is smaller than the inner diameter D ₉₁ of the interlocking cylinder 91. Further, the insertion hole 99 of the interlocking cylinder 91 has substantially the same width as the inner diameter D ₉₁ of the interlocking cylinder 91. Thereby, the lens frame 80 can be inserted into the interlocking cylinder 91 through the insertion hole 99.

  When assembling the configuration (see FIG. 3) according to the assembly 10 of the lenses L3, L4, and L5, for example, the following procedure can be included. First, the lens frame 90 holding the lens L5 is attached to the rear end of the interlocking cylinder 91. Next, the flange portion 72 of the lens frame 70 holding the lens L3 is attached to the front end of the interlocking cylinder 91. Since the interlocking cylinder 91 is not yet attached to another member, it is possible to easily adjust the positional relationship between the lens L3 and the lens L5 so that their optical axes are accurately matched.

  Next, the lens frame 80 holding the lens L <b> 4 is inserted to the inner peripheral side of the interlocking cylinder 91 through the insertion hole 99 on the side surface of the interlocking cylinder 91. With such a procedure, the lens L4 can be easily assembled between them after sufficiently adjusting the positional relationship between the lenses L3 and L5 held at both ends of the interlocking cylinder 91. Such good workability is also effective when the lens barrel 100 is maintained and maintained.

  When the lens frame 80 is inserted into the interlocking cylinder 91, the fitting portion 82 of the lens frame 80 is at the same position as the fitting portion 92 of the interlocking cylinder 91 (hidden behind the fitting portion 82 in FIG. 5). The guide bar 192 is inserted in common. Similarly, the engaging portion 84 of the lens frame 80 is disposed at the same position as the engaging portion 94 of the interlocking cylinder 91 (hidden behind the engaging portion 84 in FIG. 5), and is engaged with the guide bar 194 in common. Match.

  Of the guide bars 192 and 194 (see FIG. 3) integrated with the rear support portion 118, the guide bar 192 is passed through the fitting portions 92 and 82 in the assembly 10 thus completed. By engaging 194 with the engaging portions 94, 84, the pair of guide bars 192, 194 and the assembly 10 can be handled integrally.

  Further, a cam cylinder 160 is mounted outside the interlocking cylinder 91. Cam followers 86 and 96 are attached to the lens frame 80 or the interlocking cylinder 91 so as to penetrate the cam grooves 163 and 164 of the mounted cam cylinder 160. The mounting positions of the cam followers 86 and 96 are positions closer to the fitting portions 82 and 92 in the circumferential direction of the lens frame 80 or the interlocking cylinder 91 within a range that does not hinder the insertion of the guide bar 192 into the fitting portions 82 and 92. It is preferable to be arranged in Thereby, the drive efficiency with respect to the lens frame 80 or the interlocking cylinder 91 of the cam cylinder 160 can be improved.

  Next, the integrated assembly 10, the guide bars 192 and 194, and the rear support portion 118 are inserted into the fixed cylinder 110 from the rear, and the front end portions of the guide bars 192 and 194 are fitted into the front support portion 118. At the same time, the rear support portion 118 is fixed to the fixed cylinder 110.

  Next, the zooming operation of the lens barrel 100 will be described.

  In the lens barrel 100, when the zoom ring 130 receives a rotation operation that rotates around the optical axis X, the middle tube 140 to which the rotational driving force is transmitted through the cam follower 142 that engages with the guide groove 132 rotates. When the middle cylinder 140 rotates, the outer cylinder 150 advances straight along the straight groove 143 by the driving force transmitted from the cam groove 144 to the cam follower 152. As a result, the lens frame 159 coupled to the tip of the outer cylinder 150 and the lens L1 held by the lens frame 159 move integrally.

  When the middle cylinder 140 rotates, the rotational driving force is transmitted to the cam cylinder 160 through the cam follower 162 engaged with the straight groove 146, and the cam cylinder 160 rotates. When the cam cylinder 160 rotates, the cam cylinder 160 is given a relative driving force to the fixed cylinder 110 from the cam pin 116 of the fixed cylinder 110 that engages with the cam groove 166 of the cam cylinder 160. Since the fixed cylinder 110 is fixed to the imaging unit 200, the cam cylinder 160 advances straight while rotating according to the shape of the cam groove 166.

  Further, when the cam cylinder 160 advances straight, the cam follower 147 also advances straight along the long hole 114 of the fixed cylinder 110. Therefore, the inner cylinder 141 also advances straight according to the cam follower 147. When the inner cylinder 141 moves straight, the middle cylinder 140 also moves straight by the engagement groove 148 engaged with the engagement protrusion 149 of the inner cylinder 141.

  Furthermore, since the front end portion 124 of the transmission member 122 enters the straight groove 176 of the interlocking ring 170, the rotation of the interlocking ring 170 is restricted. Therefore, when the cam cylinder 160 rotates and goes straight, the interlocking ring 170 connected to the cam cylinder 160 moves straight by the cam follower 172 engaged with the cam groove 161. Accordingly, the lens L2 held by the lens frame 189 also goes straight.

  In this embodiment, the cam follower 172 is provided in the interlocking ring 170 and the cam groove 161 is provided in the cam cylinder 160. However, for example, even if the cam groove 161 is provided in the interlocking ring 170 and the cam follower 172 is provided in the cam cylinder 160, the same function can be obtained. The same applies to the engagement between the other groove and the protrusion.

  Further, the other cam grooves 163 and 164 of the moving cam cylinder 160 also drive the cam follower 96 of the interlocking cylinder 91 and the cam follower 86 of the lens frame 80. Since the interlocking cylinder 91 and the lens frame 80 are engaged and engaged with the guide bars 192 and 194 and the rotation thereof is restricted, when the cam cylinder 160 is driven, the interlocking cylinder 91 and the lens frame 80 advance straight.

  A cover cylinder 155 that is mounted coaxially with respect to the fixed cylinder 110 is disposed between the outer cylinder 150 and the zoom ring 130. The cover cylinder 155 advances and retreats along with the outer cylinder 150 to seal between the outer cylinder 150 and the zoom ring 130. This prevents dust from entering the lens barrel 100.

  Thus, when the zoom ring 130 is rotated, all the lenses L1, L2, L3, L4, and L5 move in the optical axis X direction. In addition, the interlocking cylinder 91 and the lens frames 159, 189, and 80 are driven by individual drive mechanisms, and thus have individual movement amounts. Thereby, the focal length of the lens barrel 100 can be changed.

Next, the focusing operation of the lens barrel 100 will be described.
When the focus ring 120 is rotated in the lens barrel 100 or when the motor of the motor chamber 115 is operated, the transmission member 122 rotates along the outer periphery of the fixed barrel 110. This rotational driving force is transmitted from the front end portion 124 of the transmission member 122 to the straight groove 176 of the interlocking ring 170 to rotate the interlocking ring 170.

  Thereby, the cam follower 172 of the interlocking ring 170 advances straight along the cam groove 161 while individually rotating with respect to the other lenses L1, L3, L4, and L5. In the present embodiment, the focal position of the lens barrel 100 can be moved by moving the lens L2 straight. Therefore, the lenses L1, L3, L4, and L5 move the lens L2 straight while the position in the optical axis X direction is fixed, so that the light flux that has passed through the optical system including the lenses L1, L2, L3, L4, and L5 is imaged. It is possible to focus on a light receiving surface such as a sensor.

  FIG. 6 is a diagram schematically illustrating the structure of the imaging apparatus 300 including the lens barrel 100. For the purpose of avoiding complicated description of the drawings, the lens barrel 100 is schematically illustrated in FIG. However, the lens barrel 100 in FIG. 6 has the same structure as the lens barrel 100 shown in FIGS. Therefore, the same reference numerals are assigned to the common components, and redundant explanation is omitted.

  The imaging device 300 includes a lens barrel 100 and an imaging unit 200. The lens barrel 100 is detachably attached to the mount unit 260 of the imaging unit 200.

  The lens barrel 100 attached to the imaging device 300 is also electrically coupled to the imaging unit 200 via a connection terminal (not shown). Thereby, the lens barrel 100 is supplied with power from the imaging unit 200. Further, a signal is also transmitted from the lens barrel 100 side to the imaging unit 200 side.

  The imaging unit 200 houses an optical system including a main mirror 240, a pentaprism 270, and an eyepiece optical system 290, and a main control unit 250. The primary mirror 240 has a standby position that is inclined on the optical path of incident light incident through the optical system of the lens barrel 100, and an imaging position that rises while avoiding the incident light (indicated by a dotted line in the figure). Move between.

  The primary mirror 240 in the standby position guides most of the incident light to the focusing screen 272 disposed above. The focusing screen 272 is disposed at a position where an image is formed when the optical system of the lens barrel 100 is focused, and visualizes the image.

  The image formed on the focusing screen 272 is observed from the eyepiece optical system 290 via the pentaprism 270. As a result, the image on the focusing screen 272 can be viewed as a normal image from the eyepiece optical system 290.

  A half mirror 292 is disposed between the pentaprism 270 and the eyepiece optical system 290. The half mirror 292 superimposes the display image formed on the finder LCD 294 on the image on the focusing screen 272. Thereby, the image of the focusing screen 272 and the image of the finder LCD 294 can be seen together at the exit end of the eyepiece optical system 290. Note that information such as shooting conditions and setting conditions of the imaging apparatus 300 is displayed on the finder LCD 294.

  A part of the light emitted from the pentaprism 270 is guided to the photometry unit 280. The photometry unit 280 measures the intensity of incident light, its distribution, and the like, and refers to the measurement result when determining imaging conditions.

  On the other hand, a secondary mirror 242 is disposed on the back surface of the primary mirror 240 with respect to the incident light incident surface. The secondary mirror 242 guides part of the incident light transmitted through the primary mirror 240 to the focus detection device 230 disposed below. Thereby, when the primary mirror 240 is in the standby position, the focus detection device 230 detects the focus adjustment state of the optical system. When the primary mirror 240 is moved to the photographing position, the secondary mirror 242 is also retracted from the optical path of the incident light.

  A shutter 220, an optical filter 212, and an image sensor 210 are arranged along the optical axis behind the main mirror 240 with respect to the incident light from the lens barrel 100. When the shutter 220 is opened, the primary mirror 240 moves to the photographing position immediately before that, so that the incident light travels straight and enters the image sensor 210. As a result, the image formed by the incident light is converted into an electrical signal in the image sensor 210.

  In addition, the imaging unit 200 includes a main LCD 296 facing the outside on the rear surface with respect to the lens barrel 100. The main LCD 296 can display various setting information for the image capturing unit 200 and can display an image formed on the image sensor 210 when the primary mirror 240 is moved to the photographing position.

  The main control unit 250 comprehensively controls the various operations as described above. In addition, an autofocus mechanism that drives the lens barrel 100 can be formed by referring to information on the distance to the subject detected by the focus detection device 230 on the imaging unit 200 side. Furthermore, the focus detection device 230 can form a focus aid mechanism by referring to the operation amount of the lens barrel 100.

  Further, the main controller 250 exchanges information with the microprocessor of the lens barrel 100 to control the opening / closing of the aperture device 222 and the like. Further, the main control unit 250 contributes to automating exposure, execution of a scene mode, execution of bracket photography, and the like.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that it can be realized in any order, unless explicitly indicated as “,” or the like, and unless the output of the previous process is used in the subsequent process. Regarding the operational flow of the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for the sake of convenience, it means that it is essential to carry out in this order. is not.

2 is a longitudinal sectional view of the lens barrel 100 in a wide-angle end state. FIG. 2 is a longitudinal sectional view of a lens barrel 100 in a telephoto end state. FIG. 2 is an exploded perspective view of a part of a lens barrel 100. FIG. It is a figure which shows the assembly method of the lens frame 80 with respect to the interlocking | linkage cylinder 91. FIG. 2 is a cross-sectional view showing the structure of the assembly 10. FIG. 2 is a diagram schematically showing the structure of an imaging apparatus 300. FIG.

10 assembly, 70, 80, 90, 159, 189 lens frame, 72 flange portion, 82, 92 fitting portion, 83, 93 fitting hole, 84, 94 engagement portion, 85, 95 U-shaped groove, 86, 96, 142, 147, 152, 162, 172 Cam follower, 91 interlocking tube, 97, 145 escape hole, 99 insertion hole, 100 lens barrel, 110 fixed tube, 111 base, 112 mount, 113 mount surface, 114 oblong hole, DESCRIPTION OF SYMBOLS 115 Motor chamber, 116 Cam pin, 118 Support part, 120 Focus ring, 122 Transmission member, 124 Front end part, 130 Zoom ring, 132 Guide groove, 140 Middle cylinder, 141 Inner cylinder, 143, 146, 176 Straight groove, 144, 161 163, 164, 166 cam groove, 148 engagement groove, 149 engagement protrusion, 150 outer cylinder, 155 cover , 160 cam cylinder, 165 connecting member, 170 interlocking ring, 192, 194 guide bar, 200 imaging unit, 210 imaging element, 212 optical filter, 220 shutter, 222 aperture device, 230 focus detection device, 240 primary mirror, 242 secondary mirror , 250 main control unit, 260 mount unit, 270 pentaprism, 272 focusing screen, 280 photometry unit, 290 eyepiece optical system, 292 half mirror, 294 finder LCD, 296 main LCD, 300 imaging device

Claims (9)

An optical system having at least a first optical component, a second optical component, and a third optical component in order;
A first guide bar extending parallel to the optical axis of the optical system;
A second guide bar arranged parallel to the first guide bar;
The first optical component has an insertion portion through which the first guide bar passes and an engagement portion with which the second guide bar engages, and a second opening is formed in line with the insertion portion in the optical axis direction. And a holding cylinder movable along the first guide bar while holding the third optical component,
A second engaging portion engaging with the first engaging portion and the second guide bar through which the first guide bar passes while protruding from the second opening portion to the outer peripheral side in a state of being arranged on the inner peripheral side of the holding cylinder . A holding frame having an engaging portion and movable along the first guide bar while holding the second optical component;
With
A lens barrel having a first opening of a size capable of inserting the holding frame to the inner peripheral side on a peripheral surface of the holding cylinder. The insertion part and the engagement part are arranged at positions substantially facing along the peripheral surface of the holding cylinder when viewed from the central axis direction of the holding cylinder,
The said 1st engaging part and the said 2nd engaging part are arrange | positioned in the position which substantially opposes along the surrounding surface of the said holding cylinder, when it sees from the center axis direction of the said holding cylinder. The lens barrel described. The length dimension of the second opening in the optical axis direction is larger than the length dimension of the first opening in the optical axis direction,
The circumferential length dimension of the holding cylinder of the second opening, the lens barrel according to claim 1 or 2, characterized in that less than the circumferential direction length dimension of the first opening. The first opening is sized such that the holding frame can be inserted while the optical axis of the second optical component and the central axis of the holding cylinder are substantially parallel to each other . The lens barrel according to any one of the above. The first opening, when viewed along the central axis of the holding cylinder, the lens barrel according to any one of up to claims 1 to 4, which is formed at a position overlapping with the engaging portion . 6. The lens barrel according to claim 1 , wherein at least one of the first guide bar and the second guide bar is disposed along an outer periphery of the holding cylinder. The lens barrel according to any one of claims 1 to 6, wherein the first engagement portion and the second engagement portion are formed integrally with the holding frame. The holding cylinder includes a receiving member that receives a driving force when moving along the first guide bar;
Wherein A receiving member and the first opening, when viewed from the center of the holding cylinder, from claim 1, which is disposed substantially opposite positions along the circumferential surface of the holding tube to Claim 7 The lens barrel according to any one of the above. The lens barrel according to any one of claims 1 to 8 ,
An imaging apparatus comprising: an imaging unit that captures an image formed by the lens barrel.

Images