JP2006301672A - Lens holding device, lens barrel, and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make compact the structure of a bearing receiving a shaft serving to support a holding member for a lens when the holding member is moved along an optical axis, and to support the holding member with high precision. <P>SOLUTION: The lens holding device according to the present invention has a three-group frame 7 holding a lens, a sleeve portion 7b provided to the three-group frame 7 and extending along the optical axis of the lens, a guide shaft 14 penetrating the sleeve portion 7b to serve to support the three-group frame 7 when the three-group frame 7 moves along the optical axis of the lens, a guide shaft 24 restricting movement of the three-group frame 7 in a rotating direction, a rear lens barrel 8 on which fixation for providing the guide shafts 14 and 24 vertically along the optical axis is based, and a bearing member receiving only the guide shaft 14, and the lens holding device is equipped, as the bearing member, with a first bearing member 91 molded together with the rear lens barrel 8 in one body through two columns 91a to receive an end of the guide shaft 14 on a side far from the rear lens barrel 8 and a guide shaft presser 9 which is fixed on the basis of the rear lens barrel 8 to receive an end of the guide shaft 14 on a side close to the rear lens barrel 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens holding device that holds a lens and supports the lens so as to be movable along an optical axis, a lens barrel using the lens holding device, and an imaging device.

  In recent years, imaging devices such as digital still cameras and digital video cameras have been required to improve portability and usability, and the entire device has been downsized. Although downsizing of lenses has been promoted, there is a strong demand for further higher image quality and higher pixels, and even if the lens that is a component of the optical system is enlarged, the optical system can be reduced by downsizing the drive mechanism. Miniaturization as a lens barrel is desired.

  In addition, so-called collapsible lenses used in image pickup apparatuses such as digital still cameras and digital video cameras are also required to be reduced in size and thickness from the viewpoint of convenience of portability. In particular, in recent digital still cameras, products pursuing further convenience of portability, such as being in shirt chest pockets and jeans pockets, are favored, and thinning as an optical lens barrel is strong. It is requested.

  Here, a so-called collapsible lens / collapse lens barrel is disclosed in Patent Document 1, and a lens driving mechanism is disclosed in Patent Document 2. In general, in order to pinch a retractable lens and a movable lens of a retractable camera so as to be movable in the optical axis direction with high accuracy, it is necessary to position and fix the guide shaft with high accuracy.

JP 2002-296480 A JP 2002-287002 A

  However, in the above prior art, in order to position and fix the guide shaft presser with respect to the rear barrel with high accuracy, multiple positioning, multiple fixing means (such as fastening elements), multiple receiving surfaces, etc. are required. Therefore, there is a problem that it is not suitable for downsizing.

  The present invention has been made to solve such problems. That is, the present invention is a lens holding device that holds three groups of precipitated copper lenses having a three-group configuration. The holding frame holds the lens, and extends along the optical axis of the lens provided on the holding frame. In order to support the sleeve portion and the holding frame when moving along the optical axis of the lens, the main guide shaft penetrating the sleeve portion and the movement of the holding frame in the rotation direction around the main guide shaft are used. A sub-guide shaft for regulating, a base serving as a fixing reference for suspending the main guide shaft and the sub-guide shaft along the optical axis, and a bearing member that receives only the main guide shaft, As a member, to receive the end of the main guide shaft on the side far from the base, a first bearing member integrally formed via the base and two columns, and an end on the side close to the base of the main guide shaft The second bearing member with the base as a fixed reference, It is as it has. Further, it is also a lens barrel and an imaging device using this lens holding device.

  In the present invention, as a bearing member that receives only the main guide shaft, a first member integrally formed via the base and the two support columns to receive the tip of the main guide shaft (end far from the base). Since this bearing member is provided, the main guide shaft can be aligned with the optical axis direction easily and with high accuracy. In addition, since the tip of the main guide shaft is positioned by the first bearing member that is integrally formed with the base, the position accuracy on the side far from the base can be greatly increased in the movement of the holding frame of the third group lens. In particular, it becomes possible to improve focusing accuracy at a particularly short distance. In addition, one-side blur at a short distance (closest side) can be easily suppressed. Also, by positioning and fixing the second bearing member directly to the base, there is no need for fastening parts such as mounting screws, so the main guide shaft can be used with high accuracy as the main guide shaft. This can be realized while keeping the direction coincident.

  Therefore, the present invention has the following effects. That is, by positioning the end of the main guide shaft with the first bearing member formed integrally with the rear barrel and positioning the rear end of the main guide shaft by the guide shaft pressing, it is not necessary to restrict the tilting of the guide shaft pressing, Since the main guide shaft can be easily and highly accurately aligned with the optical axis direction, it is possible to reduce the size without deteriorating the positioning accuracy of the main guide shaft.

  In addition, since the internal structure of the retractable lens and the image pickup device (collapse type camera) equipped with the same has been reduced in size and cost, it is possible to reduce the size and cost of the retractable lens and the retractable camera. Become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a lens barrel (collapsed lens) to which the lens holding device according to this embodiment is applied will be described. FIG. 1 is a perspective view for explaining a state of a retractable lens, where (a) shows a lens storage state when not in use, that is, a retracted state, (b) shows a WIDE state, and (c) shows a TELE state. is there. FIG. 2 is a sectional view of the retractable lens, in which (a) shows a retracted state, (b) shows a WIDE state, and (c) shows a TELE state. FIG. 3 is an exploded perspective view of the retractable lens.

  The retractable lens 1 optically has a three-group configuration, and the first group and the second group are driven in the optical axis direction along a predetermined cam curve to perform zooming, and the third group is slightly displaced in the optical axis direction. To perform focusing. That is, the focal length is varied by the displacement of the first group and the second group, and the focus is appropriately adjusted by the displacement of the third group.

  The first group frame 2 accommodates three (a plurality of) cam pins 2a fitted in the cam grooves 4b of the cam ring 4, a plurality of lens chambers 2b into which a plurality of lenses constituting the first group are inserted and fixed. In some cases, it is provided with a barrier mechanism portion 2c that protects the lens front lens in the retracted state, and is formed of, for example, a polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties, and mass productivity.

  The second group frame 3 includes three (a plurality of) cam pins 3a fitted into the cam grooves 4c of the cam ring 4 and a plurality of lens chambers 3b into which a plurality of lenses constituting the second group are inserted and fixed. For example, it is formed of a polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties and mass productivity. There may also be an iris / shutter mechanism.

  The cam ring 4 is driven by the gear unit 10 so that the gear part 4a for rotating the cam ring 4 with the inner diameter of the fixed ring 6 and the three cam pins 2a of the first group frame 2 are engaged with each other. ) Cam groove 4b, three (plural) cam grooves 4c to which the cam pins 3a of the second group frame 3 are fitted, and three (plural) cam pins 4d to be fitted to the cam grooves 6a of the stationary ring 6. For example, it is formed of a polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties and mass productivity.

  The cam groove 4b and the cam groove 4c move the first group and the second group in the optical axis direction along a predetermined curve to perform a zooming operation. The rectilinear guide ring 5 is a member that moves in the optical axis direction with the inner diameter of the fixed ring 6 integrally with the cam ring 4, and guides the first group frame 2 in the optical axis direction and the second group frame 3 through the light. A guide groove 5b for guiding in the axial direction is provided. The guide groove 5b is formed of, for example, a polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties, and mass productivity.

  The fixed ring 6 is a member fixed to the rear barrel 8, and includes three (a plurality of) cam grooves 6a into which the cam pins 4d of the cam ring 4 are fitted. For example, a polycarbonate resin containing glass fiber It is molded in (black) and has strength, light shielding and mass productivity.

  The third group frame 7 includes a lens chamber 7a for inserting and fixing lenses constituting the third group. For example, the third group frame 7 is formed of polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties and mass productivity. I have. The third group frame 7 is held so as to be movable in the optical axis direction with respect to the rear barrel 8 and can be slightly displaced in the optical axis direction by a power source such as a stepping motor 15.

  The third group frame 7 corresponds to the lens holding frame of the present embodiment, and the rear barrel 8 corresponds to the base of the present embodiment. The lens holding device according to this embodiment will be described later. A fixed ring 6, a guide shaft retainer 9, and a gear unit 10 are positioned and fixed to the rear barrel 8. Guide shafts 14 and 24 are suspended from the rear barrel 8. This guide shaft 14 is a main guide shaft, and penetrates through the sleeve portion 7b extending along the optical axis direction in the third group frame 7, and serves as a support when the third group frame 7 moves along the optical axis. ing. On the other hand, the guide shaft 24 is a sub-guide shaft and is disposed in a groove provided at the periphery of the third group frame 7 and restricts the third group frame 7 from rotating around the guide shaft 14.

  The rear lens barrel 8 has a recess for inserting, positioning, and fixing an optical filter 11 such as an optical low-pass cut filter and an infrared cut filter, and prevents dust and the like from entering the inside of the lens barrel. And a recess for inserting the seal rubber 12 for elastically urging. The recess is formed of, for example, a polycarbonate resin (black) containing glass fiber, and has strength, light shielding properties, and mass productivity. A solid-state imaging device 13 such as a CCD or CMOS is positioned and fixed on the rear barrel 8 with high accuracy.

  The gear unit 10 drives the cam ring 4 by a gear portion 4a. The gear ratio is determined so that a sufficient driving force can be obtained in the range of collapsing → WIDE → TELE and TELE → WIDE → collapse. The gear unit 10 performs a zooming operation of the retractable lens by driving the cam ring 4.

  The stepping motor 15 includes a lead screw 15a for minutely displacing the third group frame 7 in the optical axis direction and an attachment metal plate 15b for positioning and fixing with respect to the rear barrel 8.

  Hereinafter, the operation of the lens will be described. In the operation between the retracted state and the optical WIDE, the cam ring 4 is driven by the gear unit 4a being given a driving force by the gear unit 10, and the cam pin 4d rotates while rotating along the cam groove 6a of the fixed ring 6. Move toward the subject in the axial direction. At this time, the linear guide ring 5 moves integrally with the cam ring 4 (see arrow A in FIG. 2).

  At this time, in the first group frame 2, the cam pin 2a moves along a cam groove 4b and a guide groove 5a along a predetermined curve (see arrow B in FIG. 2). At this time, in the second group frame 3, the cam pin 3a moves along a cam groove 4c and a guide groove 5b along a predetermined curve (see arrow C in FIG. 2). As described above, the first group and the second group are moved to predetermined positions and optically become WIDE positions.

  In the operation between the optical WIDE and the optical TELE, the cam ring 4 is driven when the gear portion 4a is given a driving force by the gear unit 10, but in this range, the cam groove 6a has the cam ring 4 in the optical axis direction. The linear guide ring 5 is not moved in the optical axis direction (see arrow D in FIG. 2).

  At this time, in the first group frame 2, the cam pin 2a moves along a cam groove 4b and a guide groove 5a along a predetermined curve (see arrow E in FIG. 2). At this time, in the second group frame 3, the cam pin 3a moves along a cam groove 4c and a guide groove 5b along a predetermined curve (see arrow F in FIG. 2). As described above, the first group and the second group move along a predetermined curve, and perform a zooming operation by optically moving between WIDE and TELE.

  The optical TELE → optical WIDE → collapsed state is performed by rotating the cam ring 4 in the opposite direction by driving the gear unit 10 in the opposite direction to the above operation. When the cam ring 4 is driven by the gear unit 10 described above, the retractable lens 1 performs a retracting operation and a zooming operation, but the third group is slightly displaced in the optical axis direction by a driving source such as a stepping motor 15 different from this. A focusing operation is performed (see arrow G in FIG. 2).

  Next, a first embodiment of the lens holding device according to this embodiment will be described. 4 is an exploded perspective view illustrating the lens holding device according to the present embodiment, FIG. 5 is a perspective view illustrating an assembled state of the lens holding device according to the present embodiment, and FIG. 6 is a lens according to the present embodiment. It is a front view explaining a holding device.

  The configuration of the lens holding device according to the present embodiment receives the tip of the guide shaft 14 (the end far from the rear barrel 8), so that the first bearing member 91 integrally formed with the rear barrel 8 and the guide A guide shaft presser 9 that is a second bearing member for positioning the rear end of the shaft 14 (the end closer to the rear barrel 8) is provided.

  The first bearing member 91 includes two support columns 91a extending from the rear barrel 8, and a bearing portion 91b held by the support column 91a. Since the bearing portion 91b is held by the support column 91a, it is possible to obtain sufficient strength when the guide shaft 14 is received by the bearing portion 91b. In this embodiment, the bearing portion 91b is held by the two support columns 91a, but the bearing portion 91b may be held by more than two support columns 91a. Moreover, you may make it hold | maintain the bearing part 91b with the one support | pillar 91a.

  The rear barrel 8 includes a positioning portion 8c for positioning the positioning projection 9e of the guide shaft presser 9 and a fixing portion 8d for fixing the fixing projection 9f of the guide shaft presser 9. The guide shaft holder 9 is positioned by a bearing portion 9b for holding the guide shaft 14 between the first bearing member 91 of the rear barrel 8 with high accuracy and a positioning portion 8c of the rear barrel 8. A positioning projection 9e and a fixing projection 9f fixed by a fixing portion 8d of the rear barrel 8 are provided.

  The guide shaft holder 9 is temporarily assembled with the guide shaft 14 positioned as shown in FIGS. 5 (a), 6 (a) and 6 (b). 5A is a perspective view of the temporarily assembled state, FIG. 6A is a front view of the temporarily assembled state, and FIG. 6B is a rear front view of the temporarily assembled state. In this state, as shown in FIG. 6B, the positioning projection 9e can be arranged with a clearance with the positioning portion 8c, and can rotate with a small frictional resistance.

  Next, the guide shaft holder 9 is rotated (see the arrow in FIG. 6A), and the fixing projection 9f is snap-fitted to the fixing portion 8d as shown in FIGS. 5B, 6C and 6D. When fixed by a very easy method such as (rotation press-fitting less than one rotation), the positioning projection 9e is positioned by the positioning portion 8c as shown in FIG. 6D, and due to an external force such as an impact load due to frictional resistance. Can also be fixed so that it does not come off easily. Here, FIG. 5B is a perspective view of the assembled state, FIG. 6C is a front view of the assembled state, and FIG. 6B is a rear view of the assembled state. The positioning can be performed regardless of means such as fitting and press-fitting.

  According to the configuration of the lens holding device of this embodiment, the front end of the guide shaft 14 is positioned by the first bearing member 91 formed integrally with the rear barrel 8, and the guide shaft retainer 9 is positioned behind the guide shaft 14. By positioning the end, it is not necessary to restrict the tilting of the guide shaft presser 9 and the guide shaft 14 can be easily and highly accurately aligned with the optical axis direction, so that the positioning accuracy of the guide shaft 14 is deteriorated. Miniaturization is possible without any problem.

  Further, since the tip end of the guide shaft 14 (the end far from the rear barrel 8) is positioned by the first bearing member 91 that is integrally formed with the rear barrel 8, the rear barrel is moved in the movement of the third group frame 7. The position accuracy on the side far from 8 can be greatly increased, and the focusing accuracy at a particularly short distance can be improved. In addition, one-side blur at a short distance (closest side) can be easily suppressed.

  Further, by providing a means for positioning and fixing the guide shaft holder 9 directly to the rear barrel 8, there is no need for a fastening portion such as a mounting screw, so that the problem of miniaturization and cost reduction is increased. This can be achieved while keeping the accuracy in the optical axis direction. Furthermore, since the internal structure of the retractable lens and the retractable camera has been reduced in size and cost, the retractable lens and the retractable camera can be reduced in size and cost.

  Next, a second embodiment will be described. FIG. 7 is an exploded perspective view for explaining a second embodiment of the lens holding device. That is, the lens holding device includes a first bearing member 91 formed integrally with the rear barrel 8 and a guide shaft holder 9 for positioning the rear end of the guide shaft 14 in order to receive the tip of the guide shaft 14. However, the guide shaft holder 9 is different from the first embodiment in that the guide shaft holder 9 is fixed to the rear barrel 8 by screwing.

  That is, the front end of the guide shaft 14 is positioned by the first bearing member 91 in a state where the guide shaft 14 is passed through the third group frame 7, and the rear end of the guide shaft 14 is in this state to the bearing portion 9 b of the guide shaft holder 9. Fit. A screw is provided in advance on the peripheral edge of the guide shaft holder 9 so that it can be screwed into a screw provided in a hole of the rear barrel 8.

  In this way, the guide shaft 14 can be clamped between the first bearing member 91 with high accuracy by screwing the guide shaft retainer 9 into the rear barrel 8. Further, by providing a fitting portion or the like before / after the screw portion, it is possible to pinch with higher accuracy. Further, by attaching the guide shaft presser 9 to the rear barrel 8 by screwing, the guide shaft presser 9 can be securely fixed without using a separate fastener.

  Next, a third embodiment will be described. FIG. 8 is an exploded perspective view for explaining a third embodiment of the lens holding device. That is, this lens holding device is the same as that of the first embodiment in that it includes a first bearing member 91 formed integrally with the rear barrel 8 in order to receive the tip of the guide shaft 14. The difference is that the guide shaft holder 9 that receives the rear end is also used as a mounting plate 15b of the stepping motor 15 that is a drive source.

  That is, in this embodiment, the stepping motor 15 is configured to be attached from the rear side of the rear barrel 8, and the guide shaft holder 9 is configured by extending a part of the mounting sheet metal 15 b of the stepping motor 15. Yes.

  In order to assemble, the front end of the guide shaft 14 is positioned by the first bearing member 91 in a state where the guide shaft 14 is passed through the third group frame 7, and in this state, the stepping motor 15 is moved to the rear barrel 8 via the mounting plate 15b. In addition, the extending portion of the attachment metal plate 15b is used as a guide shaft presser 9 to receive the rear end of the guide shaft 14.

  The guide shaft retainer 9 that is an extended portion of the attachment metal plate 15b is provided with a recess for receiving the rear end of the guide shaft 14, and positioning is performed by fitting the rear end of the guide shaft 14 into the recess. The recess may be a through hole or a depression. In the case of a through hole, the rear end of the guide shaft 14 is tapered or stepped so that the guide shaft 14 does not come off.

  In this way, by using the mounting plate 15b of the stepping motor 15 as the guide shaft holder 9, it is possible to reduce the number of parts and the number of mounting work steps.

  Next, a fourth embodiment will be described. FIG. 9 is an exploded perspective view illustrating a fourth embodiment of the lens holding device. That is, this lens holding device is the same as that of the first embodiment in that it includes a first bearing member 91 formed integrally with the rear barrel 8 in order to receive the tip of the guide shaft 14. The difference is that the guide shaft retainer 9 that receives the rear end is also used as the mounting sheet metal 13 b of the solid-state imaging device 13.

  That is, in this embodiment, when attaching the solid-state imaging device 13 from the rear side of the rear barrel 8, the guide shaft presser 9 is configured by extending a part of the mounting sheet metal 13 b of the solid-state imaging device 13.

  In order to assemble, the front end of the guide shaft 14 is positioned by the first bearing member 91 in a state where the guide shaft 14 is passed through the third group frame 7, and in this state, the solid-state image pickup device 13 is attached to the rear barrel through the mounting plate 13b. 8, and the rear end of the guide shaft 14 is received as an extension portion of the attachment metal plate 13 b as a guide shaft presser 9.

  A guide shaft retainer 9 that is an extended portion of the mounting sheet metal 13b is provided with a recess for receiving the rear end of the guide shaft 14 in the same manner as described above, and positioning is performed by fitting the rear end of the guide shaft 14 into the recess. The The recess may be a through hole or a depression. In the case of a through hole, the rear end of the guide shaft 14 is tapered or stepped so that the guide shaft 14 does not come off.

  Thus, by using the mounting sheet metal 13b of the solid-state imaging device 13 as the guide shaft holder 9, it is possible to reduce the number of parts and the number of mounting work steps.

  Next, a fifth embodiment will be described. FIG. 10 is an exploded perspective view for explaining a fifth embodiment of the lens holding device. That is, the lens holding device includes a first bearing member 91 formed integrally with the rear barrel 8 and a guide shaft holder 9 for positioning the rear end of the guide shaft 14 in order to receive the tip of the guide shaft 14. However, the difference is that the guide shaft 14 is integrally formed with the first bearing member 91 (that is, the rear barrel 8).

  That is, in the present embodiment, when the rear barrel 8 is formed, the first barrel member 91 and the first bearing member 91 are integrally molded with the tip end of the guide shaft 14 positioned.

  At the time of assembly, since the guide shaft 14 is already connected to the first bearing member 91, the guide shaft presser 9 is attached with the third group frame 7 passing through the guide shaft 14, and the rear of the guide shaft 14. Try to receive the edge. The structure of the guide shaft retainer 9 may be a snap fit as in the first embodiment, or may be screwed in as in the second embodiment, or the mounting plate 15b of the stepping motor 15 as in the third embodiment. Or the mounting plate 13b of the solid-state imaging device 13 as in the fourth embodiment.

  With such a configuration, the guide shaft 14 is not made a separate part, and the number of parts can be reduced. Further, since the guide shaft 14 is already fixed at the time of assembly, it is possible to perform easy and accurate positioning.

  Next, a sixth embodiment will be described. FIG. 11 is an exploded perspective view illustrating a sixth embodiment of the lens holding device. That is, the lens holding device includes a first bearing member 91 formed integrally with the rear barrel 8 and a guide shaft holder 9 for positioning the rear end of the guide shaft 14 in order to receive the tip of the guide shaft 14. However, the guide shaft 14 is different from the first embodiment in that it is integrally formed with the guide shaft retainer 9.

  That is, in this embodiment, when the guide shaft presser 9 is formed, the guide shaft presser 9 is integrally formed with the rear end of the guide shaft 14 positioned at the center of the guide shaft presser 9.

  To assemble, the guide shaft 14 is passed through the third group frame 7, the tip of the guide shaft 14 is positioned by the first bearing member 91, and the guide shaft holder 9 attached to the rear end of the guide shaft 14 in this state. Is fixed to the rear barrel 8. The fixing structure of the guide shaft retainer 9 may be a snap fit as in the first embodiment or a screwing as in the second embodiment.

  With such a configuration, the guide shaft 14 is not made a separate part, and the number of parts can be reduced. In addition, since the guide shaft 14 is fixed to the guide shaft presser 9 in advance during assembly, it is possible to perform easy and accurate positioning.

  Next, a seventh embodiment will be described. FIG. 12 is an exploded perspective view illustrating a seventh embodiment of the lens holding device. That is, the lens holding device includes a first bearing member 91 formed integrally with the rear barrel 8 and a guide shaft holder 9 for positioning the rear end of the guide shaft 14 in order to receive the tip of the guide shaft 14. However, the guide shaft holder 9 is made of sheet metal and is fixed to the rear barrel 8 with screws.

  To assemble, the front end of the guide shaft 14 is positioned by the first bearing member 91 in a state where the guide shaft 14 is passed through the third group frame 7, and the rear end of the guide shaft 14 is in this state the bearing portion of the guide shaft presser 9. Fit into 9b. Then, the guide shaft holder 9 is fastened and fixed to the rear barrel 8 with screws 9h. The guide shaft 14 can be supported with high strength by fastening and fixing with the guide shaft presser 9 and the screw 9h made of sheet metal.

  Next, an eighth embodiment will be described. 13A and 13B are perspective views for explaining an eighth embodiment of the lens holding device, wherein FIG. 13A is an exploded perspective view, and FIGS. 13B to 13C are perspective views for explaining assembly. That is, this lens holding device is the same as the first embodiment in that it includes a first bearing member 91 integrally formed with the rear barrel 8 in order to receive the tip of the guide shaft 14. 14 is different in that a guide shaft retainer 9 that receives the rear end of 14 is integrally formed with the rear barrel 8.

  That is, a hole having a size substantially the same as that of the guide shaft 14 is formed in a portion where the rear end of the guide shaft 14 of the rear barrel 8 is positioned, and this hole serves as a guide shaft presser 9.

  In order to assemble, the sleeve portion 7b through which the guide shaft 14 of the third group frame 7 passes is disposed on the first bearing member 91 as shown in FIG. 13 (b), and in this state, from the rear side or the front side of the rear barrel 8. The guide shaft 14 is press-fitted into the hole. Then, the guide shaft 14 is passed through the sleeve portion 7 b of the third group frame 7 to reach the first bearing member 91. As a result, a state as shown in FIG. In addition, after press-fitting the guide shaft 14 into the rear barrel 8, the rear end of the guide shaft 14 may be fixed by an adhesive or welding.

  With such a configuration, it is not necessary to prepare the guide shaft presser 9 as a separate part, the number of parts can be reduced, and the positioning accuracy of the rear end of the guide shaft 14 is determined by the position of the hole provided in the rear lens barrel 8. The guide shaft 14 can be supported with high accuracy.

  The lens barrel (collapse lens) including the various lens holding devices described above can be applied to an imaging apparatus such as a digital still camera, thereby contributing to the downsizing of the imaging apparatus.

It is a perspective view explaining the state of a retractable lens. It is sectional drawing of a retractable lens. It is a disassembled perspective view of a retractable lens. It is a disassembled perspective view explaining the lens holding device concerning this embodiment. It is a perspective view explaining the assembly state of the lens holding device concerning this embodiment. It is a front view explaining the lens holding device concerning this embodiment. It is a disassembled perspective view explaining 2nd Embodiment of a lens holding device. It is a disassembled perspective view explaining 3rd Embodiment of a lens holding device. It is a disassembled perspective view explaining 4th Embodiment of a lens holding device. It is a disassembled perspective view explaining 5th Embodiment of a lens holding device. It is a disassembled perspective view explaining 6th Embodiment of a lens holding device. It is a disassembled perspective view explaining 7th Embodiment of a lens holding device. It is a perspective view explaining 8th Embodiment of a lens holding device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Retractable lens, 2 ... 1 group frame, 3 ... 2 group frame, 4 ... Cam ring, 8 ... Rear part lens barrel, 9 ... Guide axis holder, 10 ... Gear unit, 13 ... Solid-state image sensor, 14 ... Guide shaft, 15 ... Stepping motor, 91 ... first bearing member

Claims (3)

In a lens holding device that holds three groups of lenses of a precipitated lens having a three-group configuration,
A holding frame for holding the lens;
A sleeve portion provided on the holding frame and extending along an optical axis of the lens;
In order to serve as a support when the holding frame moves along the optical axis of the lens, a main guide shaft that penetrates the sleeve portion;
A sub guide shaft for restricting movement of the holding frame in the rotation direction around the main guide shaft;
A base serving as a fixed reference for suspending the main guide shaft and the sub guide shaft along the optical axis;
A bearing member that receives only the main guide shaft,
As the bearing member,
A first bearing member integrally formed via the base and two support columns in order to receive the end of the main guide shaft on the side far from the base;
A lens holding device comprising: a second bearing member using the base as a fixed reference to receive an end of the main guide shaft closer to the base. In a lens barrel having a lens holding device inside,
The lens holding device is
In a lens holding device that holds three groups of lenses of a precipitated lens having a three-group configuration,
A holding frame for holding the lens;
A sleeve portion provided on the holding frame and extending along an optical axis of the lens;
In order to serve as a support when the holding frame moves along the optical axis of the lens, a main guide shaft that penetrates the sleeve portion;
A sub guide shaft for restricting movement of the holding frame in the rotation direction around the main guide shaft;
A base serving as a fixed reference for suspending the main guide shaft and the sub guide shaft along the optical axis;
A bearing member that receives only the main guide shaft,
As the bearing member,
A first bearing member integrally formed via the base and two support columns in order to receive the end of the main guide shaft on the side far from the base;
A lens barrel comprising: a second bearing member using the base as a fixed reference to receive an end of the main guide shaft on the side close to the base. A lens barrel having a lens holding device therein;
In an imaging apparatus comprising: an imaging element that converts an image captured through the lens inside the lens barrel into an electrical signal;
The lens holding device is
In a lens holding device that holds three groups of lenses of a precipitated lens having a three-group configuration,
A holding frame for holding the lens;
A sleeve portion provided on the holding frame and extending along an optical axis of the lens;
In order to serve as a support when the holding frame moves along the optical axis of the lens, a main guide shaft that penetrates the sleeve portion;
A sub guide shaft for restricting movement of the holding frame in the rotation direction around the main guide shaft;
A base serving as a fixed reference for suspending the main guide shaft and the sub guide shaft along the optical axis;
A bearing member that receives only the main guide shaft,
As the bearing member,
A first bearing member integrally formed via the base and two support columns in order to receive the end of the main guide shaft on the side far from the base;
An image pickup apparatus comprising: a second bearing member using the base as a fixed reference to receive an end of the main guide shaft on the side close to the base.

Images