JP2007093656A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an imaging apparatus equipped with an imaging device and a lens, and surely and easily achieving focus adjustment when assembly. <P>SOLUTION: The imaging apparatus is equipped with: a base 10 which has a fixed barrel 11 and also where the imaging device 80 is fixed behind the fixed barrel 11; a lens frame 20 holding a lens G and supported to freely move in an optical axis direction L relative to the fixed barrel 11; and a cam ring 30 or the like performing cam action so as to move the lens frame 20 in the optical axis direction, and it adopts a rotating position regulating member 40 to regulate the rotational angle position of the cam ring 30 relative to the base 10 to a predetermined area as a focus adjustment mechanism to focus the lens G on the imaging device 80 when assembly. Thus, the focus adjustment when assembly is completed is surely and easily performed while achieving the simplification of structure and the miniaturization of the apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image pickup apparatus including a lens and an image pickup element that can move in the optical axis direction, and more particularly to an image pickup apparatus including a focus adjustment mechanism that adjusts the focus between the image pickup element and the lens during assembly.

  As a conventional imaging device, there are a fixed cylinder, an imaging element fixed behind the fixed cylinder, a lens frame supported movably in the optical axis direction with respect to the fixed cylinder in front of the imaging element, and the lens frame in the optical axis direction. An annular cam ring that is pivotally supported around a fixed cylinder to perform a cam action to be moved and positioned at a plurality of shooting positions (for example, a normal shooting position and a macro shooting position), and a cam ring with a follower protruding from the lens frame A coil spring that presses against the cam surface, a presser ring that presses the coil spring, and the like are known (see, for example, Patent Document 1).

In this device, in order to adjust the focus between the lens and the image sensor at the time of assembly, the lens frame is temporarily incorporated in a predetermined position of the fixed cylinder, and the image of the subject photographed by the image sensor is checked while focusing. A method of fixing the image sensor at a position where the images are in focus (in focus) has been adopted.
However, in such a fixing method, the imaging element is fixed to the fixed cylinder with an adhesive or the like after the in-focus position is determined. There was a risk of shifting.

  Other imaging devices include a fixed cylinder with a spiral protruding piece on the inner periphery, a lens frame with a ridge that is slidably abutted on the protruding piece, and covers the lens frame from the front and is coupled to the fixed cylinder In order to fix the lens frame without using an adhesive at the in-focus position adjusted by the focus adjustment mechanism, the focus adjustment mechanism is formed by the spiral protruding piece and the protruding portion. A tooth row is formed on the front surface of the ridge portion of the frame, an engagement piece that engages with the tooth row is provided on the cover, and the lens frame is rotated and appropriately moved in the optical axis direction to adjust the focus and engage. There is known a technique in which a piece is positioned at a focusing position by engaging a tooth row (see, for example, Patent Document 2).

  In this apparatus, since the lens frame holding the lens is directly rotated with respect to the fixed cylinder and moved in the optical axis direction, there is a possibility that the captured images may vary due to the directionality (asymmetry) of the lens. is there. This focus adjustment mechanism focuses on a single shooting position, and the lens frame cannot move in the optical axis direction after adjustment, so the lens frame (lens) can be moved to multiple shooting positions after focus adjustment. I can't let you.

JP 2005-128356 A Japanese Patent Application Laid-Open No. 7-261069

  The present invention has been made in view of the above-described prior art, and the object of the present invention is to focus on assembling while reducing the size, thickness, weight, etc. of the device with a simple structure. An object of the present invention is to provide an imaging device capable of performing adjustment reliably and easily.

An imaging apparatus of the present invention includes a base that has a fixed cylinder and fixes an imaging element behind the fixed cylinder, a lens frame that holds the lens and is supported so as to be movable in the optical axis direction with respect to the fixed cylinder, and a lens frame An imaging device comprising: a cam ring that performs a cam action to move the lens in the optical axis direction; and a focus adjustment mechanism that focuses the lens with respect to the image sensor at the time of assembly, wherein the focus adjustment mechanism is A rotation position restricting member that restricts the rotation angle position of the cam ring to a predetermined region is included.
According to this configuration, after fixing the imaging device to the base with an adhesive or the like, the lens frame and the cam ring are incorporated into the fixed cylinder, and the image formed on the imaging device through the lens is in a focused position. The rotational angle position of the cam ring is regulated by the rotational position regulating member. That is, since the focus adjustment is performed after the image sensor is fixed to the base in advance, there is no problem such as a focus shift due to the image sensor not being fixed, and the focus adjustment can be performed with high accuracy. Further, since the focus adjustment mechanism is a simple rotational position restricting member, the structure can be simplified and the apparatus can be downsized.

The said structure WHEREIN: The structure which the rotation position control member is arrange | positioned adjacent to the cam ring in the radial direction perpendicular | vertical to an optical axis direction is employable.
According to this configuration, the rotational position restricting member is disposed adjacent to the outer side or the inner side of the cam ring in the radial direction perpendicular to the optical axis direction, and the apparatus can be downsized, that is, thinned in the optical axis direction. it can.

In the above configuration, the rotational position restricting member may be configured to be disposed adjacent to the cam ring in the optical axis direction.
According to this configuration, the rotational position restricting member is disposed adjacent to the rear or front of the cam ring in the optical axis direction, and the apparatus can be reduced in size in the radial direction.

In the above configuration, the base may be configured to be positioned so as to position the rotational position restricting member while rotating it at a predetermined angular interval.
According to this configuration, when the rotational position restricting member is rotated to restrict the rotational angle position of the cam ring to a predetermined angular position that is in focus, the rotational position restricting member can be positioned while slightly rotating with a click sensation. The position restricting member can be prevented from being accidentally displaced, the focus can be adjusted with higher accuracy, and the rotation position restricting member does not need to be fixed after the adjustment, and the assembling work can be simplified.

In the above configuration, the rotational position restricting member is formed so as to restrict the rotational end in one direction and the rotational end in the other direction of the cam ring, and the cam ring is at an angular position of one rotational end and the other rotational end. A configuration in which the lens frame is positioned at the macro shooting position can be employed.
According to this configuration, when the cam ring is regulated by the rotational position regulating member and is at the angular position of one of the rotational ends or the other rotational end, the subject is in focus at a close distance and macro photography is possible. In this way, by rotating the cam ring within the range restricted by the rotation position restricting member, it is possible to obtain a photographed image in focus at two photographing positions, that is, a macro photographing position and a normal photographing position. .

  As described above, according to the lens driving device of the present invention, the focus adjustment at the time of assembly can be reliably and easily performed with a simple structure while reducing the size, thickness, and weight of the device. An imaging device that can be provided can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 4 show an embodiment of an imaging apparatus according to the present invention. FIG. 1 is a front view of the apparatus, FIG. 2 is an exploded perspective view of the apparatus, and FIGS. 3 and 4 are sectional views of the apparatus. It is.

  As shown in FIGS. 1 to 4, the imaging apparatus includes a base 10 having a fixed cylinder 11 and a mounting portion 12, a lens frame 20 that is slidably supported inside the fixed cylinder 11, and around the fixed cylinder 11. A cam ring 30 rotatably supported, a positioning ring 40 as a rotational position restricting member rotatably attached to the base 10, a coil spring 50 provided so as to surround the outer peripheral surface of the fixed cylinder 11, and a coil spring 50 And an annular washer 60, a presser ring 70 that compresses and presses the coil spring 50, a CCD 80 as an image sensor fixed to the mounting portion 12, and the like. Here, a focusing adjustment mechanism for focusing the lens with respect to the CCD 80 at the time of assembly of the positioning ring 40 as the rotational position regulating member is configured.

As shown in FIG. 2, the base 10 includes a fixed cylinder 11 positioned on the front side F in the optical axis direction L, and a rectangular recess formed integrally with the fixed cylinder 11 on the rear side R in the optical axis direction L. It is formed by the attaching part 12 etc. which demarcate.
The fixed cylinder 11 has three guide holes 11a that penetrate in the radial direction and extend in the optical axis direction L and open to the front side F, six protrusions 11b that protrude forward on the front end face thereof, and a lens described later. An inner peripheral surface 11c that slidably guides the cylindrical portion 21 of the frame 20 and an outer peripheral surface 11d that rotatably supports the cam ring 30 are provided.

The three guide holes 11a are formed at an equal angle (120 degrees) in the circumferential direction, and the six protrusions 11b are formed at an equal angle (60 degrees) in the circumferential direction.
As shown in FIGS. 3 and 4, the CCD 80 is held by the holding member 81 and the like, and is fixed to the mounting portion 12 by an adhesive or the like.

  As shown in FIGS. 1 to 4, the lens frame 20 includes a cylindrical portion 21 that holds the lens G therein, three protruding portions 22 that protrude radially outward from the outer peripheral surface of the cylindrical portion 21, and an inner peripheral surface. An opening plate 24 is provided in front of the lens G to define a circular opening 24a having a predetermined diameter. The aperture plate 24 is positioned and fixed by a projection 23 formed on the lens frame 20.

  As shown in FIGS. 3 and 4, the outer peripheral surface 21 a of the cylindrical portion 21 is fitted (internally fitted) into the inner peripheral surface 11 c of the fixed cylinder 11, and is supported slidably in the optical axis direction L. Yes. The three protrusions 22 are formed at equiangular intervals (120 degrees) in the circumferential direction, are inserted through the guide holes 11a of the fixed cylinder 11, and are reciprocated only in the optical axis direction L without rattling in the circumferential direction. Guided freely. In addition, each of the protrusions 22 has a rear side surface 22a engaged with a cam surface 33 of a cam ring 30 described later, and a front side surface 22b engaged with one end portion of a coil spring 50 via an annular washer 60. It is supposed to be.

As shown in FIGS. 1 to 4, the cam ring 30 has an annular portion 31, a drive lever 32 that protrudes radially outward from the outer peripheral surface of the annular portion 31 and extends in the optical axis direction L, and a front end surface of the annular portion 31. Three cam surfaces 33 formed, an arc groove 34 formed on the rear surface of the annular portion 31, and the like are provided.
The cam ring 30 is fitted on the outer peripheral surface 11d of the fixed cylinder 11 so as to be adjacent to the positioning ring 40 in the optical axis direction L in a state where a pin 41 of the positioning ring 40 described later is inserted into the circular arc groove 34 of the annular portion 31. And is rotatably supported.

The three cam surfaces 33 receive the three projecting portions 22 (side surfaces 22a) of the lens frame 20 and exert a cam action in the optical axis direction L, and the lift amount in the optical axis direction L is continuous with rotation. It is formed so as to form an increasing profile.
When the cam ring 30 is located at the clockwise rotation end (one rotation end), that is, when the one end portion 34a of the arc groove 34 is in contact with the pin 41, as shown in FIG. When the lens frame 20 is positioned at the macro photographing position extended to the other side, while the cam ring 30 is positioned at the counterclockwise rotation end (the other rotation end), that is, the other end 34b of the arc groove 34 is the pin 41. The lens frame 20 is positioned at a normal photographing position as shown in FIG.

As shown in FIGS. 2 to 4, the positioning ring 40 as a rotational position restricting member is formed in an annular shape, and includes a pin 41 protruding in the optical axis direction L on the front surface thereof, an adjustment piece 42 protruding in the radial direction, and the like. I have.
Then, the positioning pin 40 is rotatably fitted to the fixed cylinder 11 in contact with the front surface 12a of the base 10, and is also formed in the arc groove 34 of the cam ring 30 that is built up and overlapped from the front in the optical axis direction L. On the other hand, the pin 41 is assembled so as to be fitted, and after the adjustment piece 42 is gripped and appropriately rotated and positioned at a desired angular position, it is fixed to the base 10 using an adhesive or the like. Yes.

  As shown in FIGS. 2 to 4, the coil spring 50 is attached adjacent to the three projecting portions 22 with the washer 60 interposed therebetween so as to surround the outer peripheral surface 11 d of the fixed cylinder 11. It is held in a compressed state so as to generate the urging force. Accordingly, the coil spring 50 urges the protruding portion 22 (side surface 22 b) of the lens frame 20 toward the rear side R in the optical axis direction L, and the protruding portion 22 (side surface 22 a) is always in contact with the cam surface 33. It works to let you.

  As shown in FIGS. 1 to 4, the presser ring 70 is formed in an annular shape, and includes six notches 71 on the inner peripheral surface thereof. The six notches 71 are formed at equal intervals (60 degrees) in the circumferential direction and receive the six protrusions 11b of the fixed cylinder 11 respectively. That is, the presser ring 70 is connected to the fixed cylinder 11 by fitting the protrusion 11b into the notch 71, and the coil spring 60 is also easily assembled in a compressed state.

Next, assembly of the imaging device and focus adjustment work will be described.
First, the holding member 81 holding the CCD 80 is fitted into the mounting portion 12 of the base 10 and fixed with an adhesive or the like.
Subsequently, as shown in FIG. 2, the positioning ring 40 is fitted into the fixed cylinder 11 of the base 10, and the cam ring 30 is fitted from the front so that the pin 41 enters the arc groove 34.

  Subsequently, the lens frame 20 is attached to the inside of the fixed cylinder 11 so that the protrusion 22 contacts the cam surface 33, and the washer 60 is attached around the fixed cylinder 11 so as to contact the front surface of the protrusion 22. The coil spring 50 is compressed and attached around the fixed cylinder 11 so that one end of the coil spring 50 is in contact with the clamp cylinder 50. Finally, the holding ring 70 is attached to the fixed cylinder 11 so as to hold the coil spring 50 in a compressed state.

  Subsequently, in a state where the pin 41 is in contact with one of both end portions 34 a and 34 b of the arc groove 34, the adjustment piece 42 is grasped, the positioning ring 40 is rotated, the cam ring 30 is rotated, and the CCD 80 is passed through the lens G. Is positioned at a position where the image to be photographed is in focus (focus position). Thereafter, the positioning ring 40 is fixed to the base 10 using an adhesive or the like.

  As a result, the pin 41 of the positioning ring 40 is fixed at a predetermined position of the base 10, and the cam ring 30 is positioned by contacting one end 34 a of the arc groove 34 with the fixed pin 41. The rotational angular position is regulated so that the range of the angular position corresponding to the position and the angular position corresponding to the normal photographing position where the other end 34b of the arc groove 34 abuts can be rotated. The

  In other words, when the cam ring 30 is positioned at the clockwise rotation end (position where the pin 41 contacts the one end portion 34a of the arc groove 34), the lens frame 20 extends forward as shown in FIG. When macro photography is possible, on the other hand, when the cam ring 30 is positioned at the counterclockwise rotation end (position where the pin 41 abuts against the other end 34b of the arc groove 34), as shown in FIG. Normal shooting is possible in which the frame 20 is pulled in and a subject that is several meters away is shot.

As described above, since the focus is adjusted after the CCD 80 is fixed to the base 10 in advance, there is no problem such as a focus shift due to the non-fixed CCD 80 as in the conventional case, and the focus adjustment is performed with high accuracy. Can do. Further, since the focus adjusting mechanism is the positioning ring 40 disposed adjacent to the cam ring 30 in the optical axis direction L, the dimension in the radial direction can be reduced, and the structure can be simplified and the apparatus can be downsized.
Further, since the lens frame 20 does not rotate around the optical axis L and is movable only in parallel with the optical axis L, it is possible to solve the problem of lens directivity (asymmetry).

  5 to 7 show another embodiment of the imaging apparatus according to the present invention, which is basically the same as the above-described embodiment except that the form of the rotation position restricting member is changed. Therefore, the same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof is omitted.

In this embodiment, a positioning ring 140 as a rotational position restricting member is arranged adjacent to the radially outer side of the cam ring 30 ′.
The positioning ring 140 is cut out over a predetermined length to define one end 141 and the other end 142.
In the cam ring 30 ′, the arc groove 34 described above is eliminated, one side portion 32 a of the drive lever 32 abuts on one end portion 141 of the positioning ring 140, and the other side portion 32 b of the drive lever 32 is the other end of the positioning ring 140. It comes into contact with the portion 142.

The assembly of the imaging device and the focus adjustment work will be described.
First, the holding member 81 holding the CCD 80 is fitted into the mounting portion 12 of the base 10 and fixed with an adhesive or the like.
Subsequently, the cam ring 30 ′ is fitted into the fixed cylinder 11 of the base 10, and the positioning lever 140 is fitted to the outside of the cam ring 30 ′ so that the drive lever 32 enters the notched region of the positioning ring 140. .

  Subsequently, the lens frame 20, the washer 60, the coil spring 50, and the presser ring 70 are attached to the fixed cylinder 11 as described above.

  Subsequently, the cam ring 30 ′ is rotated while rotating the positioning ring 140 in a state where the one side portion 32 a of the drive lever 32 is in contact with the one end portion 141, so that the image taken by the CCD 80 through the lens G is focused. Position it at a suitable position (focus position). Thereafter, the positioning ring 140 is fixed to the base 10 using an adhesive or the like.

  Thereby, the one end portion 141 and the other end portion 142 of the positioning ring 140 are fixed at predetermined positions of the base 10, and the cam ring 30 ′ is positioned by the one side portion 32 a of the driving lever 32 contacting the one end portion 141. The angle position corresponding to the macro shooting position to be rotated and the angle position corresponding to the normal shooting position positioned by contacting the other side portion 32b of the drive lever 32 with respect to the other end portion 142 are rotated. The rotational angular position is regulated so as to obtain.

  That is, when the cam ring 30 ′ is positioned at the clockwise rotation end (the position where the one side portion 32 a abuts on the one end portion 141 of the positioning ring 140), the lens frame 20 extends as shown in FIG. When the cam ring 30 'is positioned at the counterclockwise rotation end (the position where the other side portion 32b abuts against the other end portion 142 of the positioning ring 140), as shown in FIG. As shown in the figure, the normal shooting can be performed in which the lens frame 20 is retracted to photograph a subject several meters away.

  As described above, since the focus is adjusted after the CCD 80 is fixed to the base 10 in advance, there is no problem such as a focus shift due to the non-fixed CCD 80 as in the conventional case, and the focus adjustment is performed with high accuracy. Can do. Further, since the focus adjustment mechanism is the positioning ring 140 disposed adjacent to the cam ring 30 'in the radial direction perpendicular to the optical axis direction L, the dimension in the optical axis direction L can be reduced, the structure is simplified, and the device Can be made thinner.

  8 to 10 show still another embodiment of the imaging apparatus according to the present invention, which is basically the same as the above-described embodiment except that the rotational position restricting member and the cam ring are changed. Therefore, the same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof is omitted.

In this embodiment, a positioning ring 240 as a rotational position restricting member is disposed adjacent to the rear of the cam ring 30 ″ in the optical axis direction L.
The positioning ring 240 includes a circular arc hole 241 extending over a predetermined length, a tooth row 242 formed on the rear surface, and the like. The circular arc hole 241 defines one end 241a and the other end 241b.
In the cam ring 30 ″, the arc groove 34 described above is abolished, and an engaging portion 35 that enters the arc hole 241 of the positioning ring 240 is integrally formed behind the drive lever 32. Then, one side portion 35 a of the engaging portion 35 is in contact with one end portion 241 a of the positioning ring 240, and the other side portion 35 b of the engaging portion 35 is in contact with the other end portion 241 b of the positioning ring 240.

  The base 10 is formed with a tooth row 12a ′ that meshes with the tooth row 242 of the positioning ring 240 on the front surface 12a. That is, the positioning ring 240 can be rotated at a predetermined angular interval with a click sensation by the tooth row 242 meshing with the tooth row 12a ', and is positioned at each angular position.

The assembly of the imaging device and the focus adjustment work will be described.
First, the holding member 81 holding the CCD 80 is fitted into the mounting portion 12 of the base 10 and fixed with an adhesive or the like.
Subsequently, the positioning ring 240 is fitted into the fixed cylinder 11 of the base 10, and the cam ring 30 ″ is fitted so that the engaging portion 35 enters the arc hole 241.

  Subsequently, in the same manner as described above, the lens frame 20, the washer 60, the coil spring 50, and the presser ring 70 are attached to the fixed cylinder 11, and the tip of the protrusion 11b 'is crushed to fix the presser ring 70.

  Subsequently, the cam ring 30 ″ is rotated while rotating the positioning ring 240 in a state where the one side portion 35 a of the engaging portion 35 is in contact with the one end portion 241 a of the arc hole 241. The image to be focused is positioned at a position where it is in focus (focus position). After the focus adjustment, the tooth row 242 and the tooth row 12a ′ are engaged with each other, so that the positioning ring 240 is fixed to the base 10 without using an adhesive or the like.

  Therefore, the one end 241a and the other end 241b of the positioning ring 240 are fixed at predetermined positions of the base 10, and the cam ring 30 ″ is brought into contact with the one end 35a of the engaging portion 35 with respect to the one end 241a. The angle position corresponding to the macro shooting position to be positioned and the angle position corresponding to the normal shooting position positioned by contacting the other side portion 35b of the engaging portion 35 with the other end portion 241b are rotated. The rotational angle position is regulated so that it can move.

  That is, when the cam ring 30 ″ is positioned at the clockwise rotation end (the position where the one side portion 35a abuts on the one end portion 241a of the positioning ring 240), the lens frame 20 is extended and approached as shown in FIG. When macro photography for photographing a subject is possible, on the other hand, when the cam ring 30 ″ is positioned at a counterclockwise rotation end (a position where the other side portion 35b contacts the other end portion 241b of the positioning ring 240), FIG. As shown in FIG. 9, it is possible to perform normal photography in which the lens frame 20 is retracted to photograph a subject several meters away.

  As described above, since the focus is adjusted after the CCD 80 is fixed to the base 10 in advance, there is no problem such as a focus shift due to the non-fixed CCD 80 as in the conventional case, and the focus adjustment is performed with high accuracy. Can do. Further, since the focus adjustment mechanism is the positioning ring 240 disposed adjacent to the cam ring 30 ″ in the optical axis direction L, the radial dimension can be reduced, the structure can be simplified, and the apparatus can be thinned. .

  Further, since the positioning ring 240 is formed so as to be positioned while being rotated by a predetermined angle unit, the positioning ring 240 can be positioned while being rotated slightly with a click sensation. The focus can be adjusted with accuracy, and the positioning ring 240 does not need to be fixed after the adjustment, and the assembling work can be simplified.

In the above embodiment, the two photographing positions, the macro photographing position and the normal photographing position, are adopted as the photographing positions where the lens frame 20 is positioned in the optical axis direction L. However, the present invention is not limited to this. Other shooting positions may be adopted.
In the above embodiment, the positioning rings 40, 140, and 240 are used as the rotational position restricting members that restrict the rotational angle positions of the cam rings 30, 30 ′, and 30 ″. However, the present invention is not limited to this. Other mechanisms may be adopted as long as the rotation angle positions of 30, 30 ′, and 30 ″ can be regulated.

  As described above, the imaging device according to the present invention is required to be downsized because the focus adjustment at the time of assembly can be reliably and easily performed while achieving downsizing, thinning, and weight reduction of the device. Of course, the present invention can be applied as an imaging device (mobile camera unit) such as a portable information terminal, and is also useful in other camera systems that do not require miniaturization.

It is a front view showing one embodiment of an imaging device concerning the present invention. It is a disassembled perspective view of the imaging device shown in FIG. FIG. 2 is a cross-sectional view of the image pickup apparatus shown in FIG. 1, showing a state where the lens frame is in a normal shooting position with the lens frame retracted. FIG. 2 is a cross-sectional view of the image pickup apparatus shown in FIG. 1, showing a state in which a lens frame is in a macro shooting position advanced. It is a front view which shows other embodiment of the imaging device which concerns on this invention. FIG. 6 is a cross-sectional view of the image pickup apparatus shown in FIG. 5, showing a state where the lens frame is in a normal shooting position with the lens frame retracted. FIG. 6 is a cross-sectional view of the image pickup apparatus shown in FIG. 5, showing a state in which the lens frame is in a macro shooting position that is advanced. It is a front view which shows other embodiment of the imaging device which concerns on this invention. FIG. 9 is a cross-sectional view of the image pickup apparatus shown in FIG. 8, showing a state where the lens frame is in a normal shooting position with the lens frame retracted. FIG. 9 is a cross-sectional view of the image pickup apparatus shown in FIG. 8, showing a state in which the lens frame is in a macro shooting position that is advanced.

Explanation of symbols

L Optical axis direction G Lens 10 Base 11 Fixed tube 11a Guide hole 12 Mounting portion 12a Front surface 12a 'Tooth row 20 Lens frame 21 Cylindrical portion 22 Protruding portion 23 Protrusion 24 Opening plate 24a Opening portions 30, 30', 30 "Cam ring 31 Annular portion 32 Drive lever 32a One side portion 32b Other side portion 33 Cam surface 34 Arc groove 34a One end portion 34b Other end portion 35 Engaging portion 35a One side portion 35b Other side portion 40 Positioning ring (rotation position regulating member, focus adjustment mechanism) )
41 Pin 42 Adjustment piece 50 Coil spring 60 Washer 70 Presser ring 80 CCD (image sensor)
81 Holding member 140 Positioning ring (rotational position regulating member, focus adjustment mechanism)
141 One end 142 The other end 240 Positioning ring (rotational position regulating member, focus adjusting mechanism)
241 Arc hole 241a One end 241b The other end 242 Tooth row

Claims (5)

A base that has a fixed cylinder and fixes the imaging device behind the fixed cylinder, a lens frame that holds the lens and is supported so as to be movable in the optical axis direction with respect to the fixed cylinder, and the lens frame in the optical axis direction An imaging device comprising: a cam ring that performs a cam action to move the lens; and a focus adjustment mechanism that focuses the lens with respect to the imaging element during assembly,
The focus adjustment mechanism includes a rotation position restricting member that restricts a rotation angle position of the cam ring with respect to the base to a predetermined region.
An imaging apparatus characterized by that. The rotational position restricting member is disposed adjacent to the cam ring in a radial direction perpendicular to the optical axis direction.
The imaging apparatus according to claim 1. The rotational position restricting member is disposed adjacent to the cam ring in the optical axis direction.
The imaging apparatus according to claim 1. The base is formed so as to position the rotation position regulating member while rotating the rotation position regulating member at a predetermined angular interval.
The imaging apparatus according to claim 3. The rotational position restricting member is formed to restrict a rotational end in one direction and a rotational end in the other direction of the cam ring,
The cam ring positions the lens frame at a macro shooting position at an angular position of either the one rotation end or the other rotation end.
The imaging apparatus according to claim 4.

Images