JP2007316232A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent electrostatic charge generated by the friction of a moving frame and to allow for a smooth and stable movement of a moving barrel. <P>SOLUTION: A lens barrel is characterized in that it has: the moving barrels which has lens frames holding lenses constituting a photographing optical system and has an operation part performing operations related to photographing, are disposed movably in the optical axis direction of the photographing optical system and compose a collapsible barrel with respect to a barrel body; and an electrically conductive spring member provided in the barrel body and abutted on at least one of the moving barrels when collapsed, wherein one end of the spring member is connected to a grounded potential and the other end of the spring member energizes at lest one of the moving barrels in the direction substantially perpendicular to the moving direction of the moving barrel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus, and more particularly, to a lens barrel and an imaging apparatus provided with a movable lens group that can be retracted and zoomed.

  2. Description of the Related Art Conventionally, an autofocus camera that automatically performs focusing is known, and an in-focus position is detected by various methods, and a lens is moved to the in-focus position for shooting. A lens unit that can be retracted and zoomed by having such a moving lens group generates static electricity by moving the lens group, and external dust may be attracted to the inside of the lens barrel by this static electricity. When dust sucked into the lens barrel due to static electricity adheres to the image sensor, there is a problem that the image appears in the image, and various countermeasures for this have been proposed.

  For example, by forming a member close to the image sensor with an antistatic material or applying an antistatic coating, the member close to the image sensor does not accumulate static electricity, and dust that has entered inside the lens barrel 2. Description of the Related Art A camera unit is known that prevents dust from being captured during imaging so as not to adhere to the vicinity of the imaging device on the imaging optical path from the image sensor to the imaging device (see, for example, Patent Document 1). ).

In addition, one end of a flexible substrate provided inside the lens barrel is connected to the lens frame of the collapsible lens barrel so that a control signal is supplied from an electric circuit outside the lens barrel to an operation unit that performs operations related to photographing. There is known one in which the other end is electrically connected to a ground potential to effectively prevent an adverse effect caused by a current generated by static electricity (see, for example, Patent Document 2).
JP-A-2005-300957 JP 2005-301158 A

  However, in the case described in the above-mentioned Patent Document 1, when there are many members that require antistatic, such as a multistage retractable lens barrel, all of these members must be subjected to antistatic treatment. There is a problem that the cost is increased.

  Moreover, in the thing described in the said patent document 2, since the earthing | grounding with respect to all the movable appearance members (moving member) is incomplete, an electric potential remains in one part, and this electric potential has a bad influence on imaging. There is a problem.

  The present invention has been made in view of such circumstances, and a lens barrel that prevents static electricity generated by friction of a moving frame in a collapsible or zooming operation and enables a smooth and stable movement of the moving barrel. And an imaging apparatus.

  In order to achieve the object, the invention described in claim 1 includes a lens frame that holds a lens constituting the photographing optical system and an operation unit that performs an operation related to photographing, and is arranged in the optical axis direction of the photographing optical system. A movable barrel that is disposed so as to be movable and constitutes a collapsible barrel that can be projected and retracted with respect to the barrel main body, and a conductive barrel that is provided on the barrel main body and abuts against at least one movable barrel when retracted. A spring member, and one end of the spring member is connected to a ground potential, and the other end of the spring member biases at least one of the moving cylinders in a direction substantially perpendicular to the moving direction. A lens barrel is provided.

  As a result, static electricity generated by the retracting of the moving cylinder and zooming operation is released, dust is prevented from adsorbing into the lens barrel due to static electricity, and electrostatic damage of the electrical parts is prevented. (So-called first run) can be prevented.

  Similarly, in order to achieve the object, the invention according to claim 2 includes a lens frame that holds a lens constituting the photographing optical system, and an operation unit that performs an operation related to photographing. A movable barrel that is disposed so as to be movable in the optical axis direction and constitutes a collapsible barrel that can be projected and retracted with respect to the barrel main body, and is disposed in the barrel, and one end thereof is connected to the operating portion. And a flexible substrate for supplying a control signal to the operating unit, the other end being connected to a ground potential, and the flexible substrate is coated with a conductive material on at least one surface thereof, and the conductive material is coated Provided is a lens barrel characterized in that the movable cylinder is always in contact with the surface.

  As a result, it is possible to prevent dust in the lens barrel and to prevent electrostatic breakdown of the electrical components.

  Similarly, in order to achieve the above object, the invention according to claim 3 provides an imaging apparatus comprising the lens barrel according to claim 1 or 2.

  As a result, it is possible to obtain an image pickup apparatus that is capable of preventing dust and preventing electrostatic breakdown of electrical components and smoothly moving the movable cylinder when retracted.

  As described above, according to the present invention, static electricity generated by the retraction of the moving cylinder and zooming operation is released, dust is prevented from being adsorbed into the lens barrel by static electricity, and electrostatic breakdown of electrical components is prevented. Further, it is possible to prevent movement irregularity (so-called pre-running) of the movable cylinder when retracted.

  Hereinafter, a lens barrel and an imaging apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a digital camera 10 equipped with a lens barrel according to a first embodiment of the present invention as viewed from the front side, and FIG. 2 is a perspective view of the digital camera 10 as viewed from the back side. . FIG. 3 is a block diagram showing the overall configuration of the digital camera 10.

  As shown in FIGS. 1 and 2, the digital camera 10 has a grip portion 14 bulging forward on the left side of the front surface of the camera case 12, and a shooting button 16 is disposed on the upper surface of the camera case 12 where the grip portion 14 is located. ing. The photographing button 16 is provided at a position where it can be operated by the index finger of the right hand of the user who holds the grip portion 14. Further, a retractable / extending lens barrel 20 holding the photographing lens 18 is provided at a substantially central portion of the front surface of the camera case 12 so as to protrude forward. Furthermore, a strobe light emitting unit 22 having a xenon tube is provided on the upper right side of the front surface of the camera case 12, and a liquid crystal monitor 24, a mode selection switch 26, and a cross key 27 are disposed on the rear surface of the camera case 12 as shown in FIG. And the finder 28 are provided at predetermined positions.

  In the digital camera 10, by operating the mode selection switch 26, one shooting operation is selected from the shooting operations of still image shooting, moving image shooting, and continuous shooting (continuous shooting). When the still image shooting operation is selected, the subject is shot frame by frame by pressing the shooting button 16, and when the movie shooting operation is selected, the moving image (Motion JPEG) shooting is performed while the shooting button 16 is pressed. Is possible. When the continuous shooting operation is selected, continuous shooting is performed at a predetermined speed at predetermined time intervals while the shooting button 16 is pressed, and up to several frames immediately after the finger is lifted from the shooting button 16 are shot. can do.

  The overall operation of the digital camera 10 is comprehensively controlled by a central processing unit (CPU) 30 as shown in FIG. The CPU 30 functions as a control unit that controls the camera system according to a predetermined program, and also performs a calculation unit such as an automatic exposure (AE) calculation, an automatic focus adjustment (AF) calculation, and a white balance (WB) adjustment calculation. Function as.

  The ROM 34 connected to the CPU 30 via the bus 32 stores programs executed by the CPU 30 and various data necessary for control. The EEPROM 36 stores CCD pixel defect information, various constants / information related to camera operation, and the like. Has been.

  The memory (SDRAM) 38 is used as a program development area and a calculation work area for the CPU 30, and is also used as a temporary storage area for still image and moving image data and audio data. An HDD (Hard Disk Drive Unit) 40 is a temporary storage memory dedicated to image data. The memory 38 and the HDD 40 can be shared.

  The mode selection switch 26 is an operation unit for switching between a still image shooting, a moving image shooting, and a continuous shooting (continuous shooting) shooting mode and a playback mode. When the mode selection switch 26 is operated to connect the movable contact piece 26A to the contact a, the signal is input to the CPU 30, and the digital camera 10 is set to the photographing mode. When the movable contact piece 26A is connected to the contact point b, the digital camera 10 is set to a reproduction mode for reproducing a recorded image.

  The shooting button 16 is an operation button for inputting an instruction to start shooting, and includes a two-stroke switch having an S1 switch that is turned on when half-pressed and an S2 switch that is turned on when fully pressed.

  The menu / OK key (not shown in FIG. 2) functions as a menu button for instructing to display a menu on the screen of the liquid crystal monitor 24 and as an OK button for instructing confirmation and execution of the selection contents. This is an operation key that combines functions. The cross key 27 is an operation unit for inputting instructions in four directions, up, down, left, and right, and functions as a button for selecting an item from the menu screen or instructing selection of various setting items from each menu. With the cross key 27, one shooting operation is selected from still image shooting, moving image shooting, and continuous shooting (continuous shooting), and the selected shooting operation is confirmed by pressing the menu / OK key. A cancel key (not shown in FIG. 2) is used to delete a desired object such as a selection item, cancel an instruction content, or return to the previous operation state.

  The liquid crystal monitor 24 is also used as a user interface display screen, and displays information such as menu information, selection items, and setting contents as necessary. Although the liquid crystal monitor 24 is a liquid crystal display, other types of display devices such as an organic EL may be used instead.

  The digital camera 10 has a media socket 46, and a recording medium 48 can be attached to the media socket 46. The form of the recording medium is not particularly limited, and various media such as a semiconductor memory card represented by SmartMedia (trademark), a portable small hard disk, a magnetic disk, an optical disk, and a magneto-optical disk can be used.

  The media controller 50 performs necessary signal conversion in order to exchange input / output signals suitable for the recording medium 48 mounted in the media socket 46.

  The digital camera 10 also includes a USB interface unit 52 as communication means for connecting to a personal computer or other external device. By connecting the digital camera 10 and an external device using a USB cable, it is possible to exchange data with the external device. Of course, the communication method is not limited to USB, and other communication methods may be applied.

  Next, the photographing function of the digital camera 10 will be described.

  When the shooting mode is selected by the mode selection switch 26, power is supplied to an imaging unit including a color CCD solid-state imaging device (hereinafter referred to as CCD) 54, and a still image, a moving image, or continuous shooting is enabled. Thereafter, one of the shooting operations is selected from the still image shooting, the moving image shooting, and the continuous shooting (continuous shooting) with the cross key 27, and the selected shooting operation is confirmed by pressing the menu / OK key.

  The lens barrel 20 is an optical unit that includes a photographic lens 18 including a focusing lens and a mechanical shutter 56 that also serves as an aperture. The lens barrel 20 is electrically driven by a lens driving unit 58 and a diaphragm driving unit 60 that are controlled by the CPU 30 to perform zoom control, focus control, and iris control.

  The light that has passed through the photographic lens 18 forms an image on the light receiving surface of the CCD 54. A number of photodiodes (light receiving elements) are two-dimensionally arranged on the light receiving surface of the CCD 54, and primary color filters of red (R), green (G), and blue (B) are provided for each photodiode. They are arranged in a predetermined arrangement structure. The CCD 54 has an electronic shutter function for controlling the charge accumulation time (shutter speed) of each photodiode. The CPU 30 controls the charge accumulation time in the CCD 54 via the timing generator 62. Instead of the CCD 54, another type of image sensor such as a MOS type may be used.

  The subject image formed on the light receiving surface of the CCD 54 is converted into a signal charge of an amount corresponding to the amount of incident light by each photodiode. The signal charge accumulated in each photodiode is sequentially read out as a voltage signal (image signal) corresponding to the signal charge based on a drive pulse given from the timing generator 62 in accordance with a command from the CPU 30.

  The signal output from the CCD 54 is sent to an analog processing unit (CDS / AMP) 64 where the R, G, and B signals for each pixel are sampled and held (correlated double sampling processing), amplified, and then A / Applied to D converter 66. The dot sequential R, G, B signals converted into digital signals by the A / D converter 66 are stored in the memory 38 via the image input controller 68.

  The image signal processing circuit 70 processes the R, G, and B signals stored in the memory 38 in accordance with a command from the CPU 30. That is, the image signal processing circuit 70 includes a synchronization circuit (a processing circuit that converts a color signal into a simultaneous expression by interpolating a spatial shift of the color signal associated with the color filter array of the single CCD), a white balance correction circuit, It functions as an image processing means including a gamma correction circuit, a contour correction circuit, a luminance / color difference signal generation circuit, and the like, and performs predetermined signal processing using the memory 38 in accordance with a command from the CPU 30.

  The RGB image data input to the image signal processing circuit 70 is converted into a luminance signal and a color difference signal by the image signal processing circuit 70 and subjected to predetermined processing such as gamma correction. The image data processed by the image signal processing circuit 70 is recorded in the HDD 40.

  When the captured image is output to the liquid crystal monitor 24, the image data is read from the HDD 40 and sent to the video encoder 72 via the bus 32. The video encoder 72 converts the input image data into a predetermined signal for display (for example, an NTSC color composite video signal) and outputs the converted signal to the liquid crystal monitor 24.

  When the shooting button 16 is pressed halfway and S1 is turned on, the digital camera 10 starts AE and AF processing. That is, the image signal output from the CCD 54 is input to the AF detection circuit 74 and the AE / AWB detection circuit 76 via the image input controller 68 after A / D conversion.

  The AE / AWB detection circuit 76 includes a circuit that divides one screen into a plurality of areas (for example, 16 × 16) and accumulates RGB signals for each divided area, and provides the accumulated value to the CPU 30. The CPU 30 detects the brightness of the subject (subject brightness) based on the integrated value obtained from the AE / AWB detection circuit 76, and calculates an exposure value (shooting EV value) suitable for shooting. In accordance with the obtained exposure value and a predetermined program diagram, the aperture value and the shutter speed are determined, and the CPU 30 controls the electronic shutter and iris of the CCD 54 to obtain an appropriate exposure amount.

  The AE / AWB detection circuit 76 calculates an average integrated value for each color of the RGB signals for each divided area during automatic white balance adjustment, and provides the calculation result to the CPU 30. The CPU 30 obtains the integrated value of R, the integrated value of B, and the integrated value of G, obtains the ratio of R / G and B / G for each divided area, and R of these R / G and B / G values. The light source type is discriminated based on the distribution in the color space of / G, B / G, etc., and the white balance adjustment value suitable for the discriminated light source type is set so that, for example, each ratio value is about 1. The gain value (white balance correction value) for the R, G, and B signals of the balance adjustment circuit is controlled to correct the signal of each color channel. If the gain value of the white balance adjustment circuit is adjusted so that the above-described ratio values are values other than 1, an image in which a certain color remains can be generated.

  The AF control in the digital camera 10 is, for example, a contrast AF that moves a focusing lens (a moving lens that contributes to focus adjustment among the lens optical systems constituting the photographing lens 18) so that the high-frequency component of the G signal of the video signal is maximized. Applies. That is, the AF detection circuit 74 cuts out a signal in a focus target area set in advance in a high-pass filter that passes only a high-frequency component of the G signal, an absolute value processing unit, and a screen (for example, the center of the screen). An area extraction unit and an integration unit that integrates absolute value data in the AF area are configured.

  The integrated value data obtained by the AF detection circuit 74 is notified to the CPU 30. The CPU 30 calculates a focus evaluation value (AF evaluation value) at a plurality of AF detection points while moving the focusing lens by controlling the lens driving unit 58, and determines a lens position where the evaluation value is a maximum as a focus position. To do. Then, the lens driving unit 58 is controlled so as to move the focusing lens to the obtained in-focus position. The calculation of the AF evaluation value is not limited to a mode using the G signal, and a luminance signal (Y signal) may be used.

  The shooting button 16 is pressed halfway, AE / AF processing is performed when S1 is turned on, the shooting button 16 is fully pressed, and the shooting operation for recording starts when S2 is turned on. The image data acquired in response to S2 ON is converted into a luminance / color difference signal (Y / C signal) in the image signal processing circuit 70, subjected to predetermined processing such as gamma correction, and then stored in the memory 38. The

  The Y / C signal stored in the memory 38 is compressed according to a predetermined format by the compression / expansion circuit 78 and then recorded on the recording medium 48 via the media controller 50. For example, an image is recorded in JPEG format.

  When the playback mode is selected by the mode selection switch 26, the compressed data of the final image file (last recorded file) recorded on the recording medium 48 is read. When the file related to the last recording is a still image file, the read compressed image data is expanded to an uncompressed YC signal via the compression / expansion circuit 78 and then passed through the image signal processing circuit 70 and the video encoder 72. Are converted into display signals and then output to the liquid crystal monitor 24. Thereby, the image content of the file is displayed on the screen of the liquid crystal monitor 24.

  During single-frame playback of still images (including playback of the first frame of a movie), the file to be played can be switched by operating the right or left key of the four-way controller (forward frame advance / reverse frame advance). it can. The image file at the frame-advanced position is read from the recording medium 48, and still images and moving images are reproduced and displayed on the liquid crystal monitor 24 in the same manner as described above. The digital camera 10 is driven by the power of the battery 82 supplied through the power supply circuit 80. The above is the overall configuration of the digital camera 10.

  4 and 5 show the lens barrel 20 according to the first embodiment. FIG. 4 is a cross-sectional view of the lens barrel 20 at the time of feeding (shooting), and FIG. 5 is a cross-sectional view of the lens barrel 20 at the time of retracting.

  This lens barrel 20 is a two-stage retractable retractable lens barrel, and is fixed to a fixed barrel 90 covered with a camera case 12 (not shown in FIGS. 4 and 5), and freely rotatable on the outer peripheral surface of the fixed barrel 90. A drive cylinder 92 inserted into the fixed cylinder 90, a second moving cylinder (cam cylinder) 94 that is inserted into the inner peripheral surface of the fixed cylinder 90, rotates while rotating relative to the fixed cylinder 90, and retracts. A cam follower pin 98 that engages with the cam groove 96; a first moving cylinder 100 that is fitted and inserted into the inner peripheral surface of the second moving cylinder 94 and that rotates and retracts with respect to the second moving cylinder 94; A cam follower pin 104 that engages with the cam groove 102 of the second moving cylinder 94, a first photographic lens 18a held by the first lens frame 106, a second photographic lens 18b held by the second lens frame 108, and a second One photographing lens 18a and second photographing lens 18b A fixed lens 18c held by a fixed lens frame 112, and a plate-shaped lens barrel body (base) 114 formed integrally with the fixed cylinder 90 and holding the CCD 54. Yes.

  In addition, the end of the fixed cylinder 90 and the second portion are arranged so that dust does not enter from the gap between the fixed cylinder 90 and the second movable cylinder 94 and the gap between the second movable cylinder 94 and the first movable cylinder 100. A cloth film 116 is provided at the end of the movable cylinder 94.

  Further, in the lens barrel 20 of the first embodiment, in order to prevent the adverse effects due to static electricity generated by the friction of the moving frame in the retracting and zooming operations, etc., and to enable the moving barrel to move smoothly and stably. A conductive spring member 118 is provided from the lens barrel main body 114 toward the inside of the fixed cylinder 90. The conductive spring member 118 includes a vertical piece 118a and a horizontal piece 118b, and is grounded to the outside from the lens barrel body 114 through one end portion 118c.

  Further, as shown in FIG. 5, the first moving cylinder 100 and the second moving cylinder 94 are housed in the fixed cylinder 90 when retracted. When the lens barrel 20 shifts from the retracted state shown in FIG. 5 to the extended state shown in FIG. 4, when the drive cylinder 92 is driven to rotate, the rotational force is transmitted to the second movable cylinder (cam cylinder) 94. As a result, the second moving cylinder 94 is fed out while rotating while leaving the fixed cylinder 90, and at the same time, the first moving cylinder 100 further passes through the second moving cylinder 94 with respect to the second moving cylinder 94. It is paid out.

  Similarly, when shifting from the extended state shown in FIG. 4 to the retracted state shown in FIG. 5, the drive cylinder 92 is driven to rotate in the reverse direction, so that the second movable cylinder 94 rotates while being fixed. The first moving cylinder 100 is retracted with respect to the second moving cylinder 94 at the same time.

  When the lens barrel is retracted, the protrusion 94 a provided at the end of the second moving cylinder 94 on the lens barrel main body 114 side comes into contact with the vertical piece 118 a of the conductive spring member 118. When the protrusion 94a is in contact with the vertical piece 118a, static electricity generated in the first moving cylinder 100, the second moving cylinder 94, and the like can be released from the end 118c of the spring member 118 to the ground side. Thereby, it is possible to prevent the dust adsorbed by the static electricity from being reflected on the image pickup device, the electrostatic breakdown of the electrical components, and the like.

  Further, when the lens barrel 20 is retracted, the horizontal piece 118 b of the spring member 118 comes into contact with the inner peripheral wall of the first moving cylinder 100, and the inner peripheral wall of the first moving cylinder 100 is moved with respect to the moving direction of the first moving cylinder 100. Thus, it is biased in the vertical direction (upward in FIG. 5). Thereby, the movement nonuniformity (so-called advance) of the 1st moving cylinder 100 (and 2nd moving cylinder 94) at the time of retraction can be prevented.

  When the spring member 118 is retracted, a part of the spring member 118 comes into contact with the protrusion 94 a provided at the end of the second moving cylinder 94 to release the static electricity generated in the lens barrel 20 to the ground side, and the spring member. Any material can be used as long as a part of 118 (the same as or other than the above) can contact the inner peripheral wall of the first moving cylinder 100 to prevent the movement unevenness of the first moving cylinder 100 when retracted. The shape is not particularly limited.

  For example, in FIG. 4 or FIG. 5, the shape of the tip of the horizontal piece 118b of the spring member 118 may be such that the tip of the horizontal piece 118b and the first moving cylinder 100 are in point contact or line contact. Alternatively, the shape may be in surface contact. Further, at this time, a groove may be formed in accordance with the shape in which the contact point with the tip of the horizontal piece 118b on the inner wall surface of the first moving cylinder 100 moves. Thereby, the 1st moving cylinder 100 can be moved smoothly and evenly.

  As described above, according to the first embodiment, the static electricity generated in the lens barrel 20 is released, thereby preventing the dust from being adsorbed by the static electricity and preventing the electrostatic breakdown of the electrical components. Uneven movement (previous run) of the moving cylinder can be prevented.

  Next, a second embodiment of the present invention will be described.

  6 and 7 show a lens barrel 120 according to the second embodiment. FIG. 6 is a cross-sectional view of the lens barrel 120 at the time of feeding (at the time of shooting), and FIG. 7 is a cross-sectional view of the lens barrel 120 at the time of retracting. Note that an external view and a block diagram showing the overall configuration of a digital camera on which the lens barrel 120 of the second embodiment is mounted are the same as those in the first embodiment described above, and will be omitted.

  As shown in FIG. 6, the lens barrel 120 of the second embodiment is also a two-stage retractable and retractable lens barrel similar to the first embodiment described above, and is fixed by a camera case not shown. A cylinder 190, a drive cylinder 192 that is rotatably inserted into the outer peripheral surface of the fixed cylinder 190, and a second cylinder that is inserted into the inner peripheral surface of the fixed cylinder 190 and rotates while being rotated with respect to the fixed cylinder 190. A movable barrel (cam barrel) 194, a cam follower pin 198 that engages with a cam groove 196 of the drive barrel 192, and an inner peripheral surface of the second movable barrel 194 are inserted into the second movable barrel 194 while rotating. The first moving cylinder 200 that extends and retracts, the cam follower pin 204 that engages with the cam groove 202 of the second moving cylinder 194, the first photographing lens 218a and the second lens frame that are held by the first lens frame 206. Held in 208 A second photographing lens 218b, a second photographing lens 218b held by the first photographing lens 218a and the second lens frame 208, and a shutter 210 provided in relation to the first photographing lens 218a and the second photographing lens 218b. The fixed lens 218c is held by the fixed lens frame 212, and the plate-shaped lens barrel main body (base) 214 is integrally formed with the fixed cylinder 190 and holds the CCD 154.

  In addition, the end of the fixed cylinder 190 and the second portion of the fixed cylinder 190 and the second movable cylinder 194 and the second movable cylinder 194 and the second movable cylinder 194 and the second movable cylinder 194 are arranged so as to prevent dust from entering through the gap between the second movable cylinder 194 and the first movable cylinder 200. A cloth film 216 is provided at the end of the movable cylinder 194.

  Further, in the lens barrel 120 of the second embodiment, in order to prevent the adverse effect due to static electricity generated by the friction of the moving frame in the retracting or zooming operation, and to enable the moving barrel to move smoothly and stably, The lens barrel 120 includes a flexible substrate 220 that connects the shutter 210 and the ground end.

  The flexible substrate 220 is provided on a movable lens frame and supplies a control signal to a shutter 210 or the like as an operation unit that performs an operation related to photographing. A conductive material is provided on at least a surface of the flexible substrate 220 that is in contact with the moving cylinder. Is applied, and the conductive surface is grounded to the inner surface of the lens barrel.

  Specifically, as shown in FIG. 6, the flexible substrate 220 has one end connected to the shutter 210 and is disposed along the inner walls of the first moving cylinder 200, the second moving cylinder 194, and the fixed cylinder 190. The lens barrel 120 is connected to the ground side outside.

  Further, at this time, the projection 200 a and the projection 194 a provided at the end of the first movable barrel 200 and the second movable barrel 194 on the lens barrel main body 114 side respectively contact one surface of the flexible substrate 220. It is like that. In addition, a part of the flexible substrate 220 is accommodated in a groove 190 a formed in the fixed cylinder 190.

  As shown in FIG. 7, when the lens is retracted, the first moving cylinder 200 and the second moving cylinder 194 are kept in the extended state of FIG. 6 while the protrusions 200a and 194a remain in contact with the flexible substrate 220, respectively. Move to the retracted state. On the contrary, when moving from the retracted state of FIG. 7 to the extended state of FIG. 6, the first moving cylinder 200 and the second moving cylinder 194 are in a state in which the protrusions 200 a and 194 a are in contact with the flexible substrate 220. While moving.

  As described above, the protrusion 200a and the protrusion 194a are configured to always contact one surface of the flexible substrate 220. Since the protrusion 200a and the protrusion 194a are always in contact with one surface of the flexible substrate 220, the contact portion with the flexible substrate 220 is formed with a roundness. Further, in particular, in order to suppress damage due to wear or the like of the protrusions 200a, 194a or the flexible substrate 220 caused by contact and movement, the tips of the protrusions 200a, 194a are formed of a rotatable member, and the flexible substrate 220 is formed. You may comprise so that it may contact, rotating.

  Further, the surface of the flexible substrate 220 with which the protrusion 200a and the protrusion 194a come into contact is a conductive surface, so that static electricity generated by friction due to the movement of the moving cylinder can be transferred from the protrusions 200a and 194a to the flexible substrate. It can escape to the ground side via 220.

  As a result, it is possible to effectively prevent adverse effects due to static electricity such as reflection of dust adsorbed by static electricity onto the image sensor and electrostatic breakdown of electrical components.

  The lens barrel and the imaging device of the present invention have been described in detail above, but the present invention is not limited to the above examples, and various improvements and modifications can be made without departing from the gist of the present invention. Of course it is good.

It is the perspective view which looked at the digital camera carrying the lens barrel concerning the present invention from the front. It is the perspective view which looked at the digital camera of FIG. 1 from the back. It is a block diagram which shows the whole structure of the digital camera shown in FIG. It is sectional drawing which shows the state at the time of extension of the lens-barrel of 1st Embodiment of this invention. It is sectional drawing which shows the state at the time of retraction of the lens-barrel shown in FIG. It is sectional drawing which shows the state at the time of extension of the lens-barrel of 2nd Embodiment of this invention. It is sectional drawing which shows the state at the time of retraction of the lens-barrel shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Digital camera, 12 ... Camera case, 14 ... Grip part, 16 ... Shooting button, 18 ... Shooting lens, 20 ... Lens barrel, 90 ... Fixed barrel, 92 ... Drive barrel, 94 ... Second moving barrel, 96 ... Cam groove, 98 ... cam follower pin, 100 ... first moving cylinder, 102 ... cam groove, 104 ... cam follower pin, 106 ... first lens frame, 108 ... second lens frame, 110 ... shutter, 112 ... fixed lens frame 114 ... Main body (base), 118 ... Spring member

Claims (3)

A lens frame that holds a lens constituting a photographing optical system and an operation unit that performs an operation related to photographing, and is disposed so as to be movable in the optical axis direction of the photographing optical system, and can be retracted into and out of the lens barrel body. A movable barrel that constitutes a lens barrel of the type,
A conductive spring member provided in the lens barrel body and in contact with at least one of the movable cylinders when retracted;
One end of the spring member is connected to a ground potential, and the other end of the spring member biases at least one of the moving cylinders in a direction substantially perpendicular to the moving direction. Lens barrel to be used. A lens frame that holds a lens constituting a photographing optical system and an operation unit that performs an operation related to photographing, and is disposed so as to be movable in the optical axis direction of the photographing optical system, and can be retracted into and out of the lens barrel body. A movable barrel that constitutes a lens barrel of the type,
A flexible substrate disposed in the lens barrel, one end of which is connected to the operating unit and the other end is connected to a ground potential, and supplies a control signal to the operating unit;
The lens barrel is characterized in that the flexible substrate is coated with a conductive material on at least one surface thereof, and the movable tube is always in contact with the surface coated with the conductive material.   An imaging apparatus comprising the lens barrel according to claim 1.

Images