JP5037802B2 - Assembly barrel - Google Patents

Description

The present invention, digital cameras, film cameras, and to assemble barrel is provided in the shooting apparatus such as a video camera.

  In recent years, digital cameras that can capture an image in a memory without using a film are rapidly spreading. Some digital cameras include a zoom mechanism that uses a lens barrel unit to move a plurality of optical lenses in the direction of the optical axis to change the photographing magnification.

For example, in Patent Document 1, a plurality of lens holding units that hold a plurality of lenses are moved in the optical axis direction by a cam ring, and a photographing lens barrel that restricts movement of the lens holding unit in the rotation direction by a rotation regulating unit. Is disclosed. According to this configuration, the optical lens can be moved to a specified position.
Japanese Patent Laid-Open No. 07-027962

  However, conventionally, when two lens barrels are integrally incorporated in a lens barrel unit, so-called bayonet coupling is performed in which a convex rib is provided on one side and a concave groove is provided on the other to rotationally fit each other. In order to perform this bayonet coupling, it is necessary to provide a lens barrel having a cam region that is one step longer than the cam region of a normally used lens barrel. As a result, there is a problem that the entire lens barrel unit is increased in size.

  Also, as shown in FIG. 13, a method is used in which one of the lens barrels 9 is provided with a hook-like snap fit shape 9a that can be elastically deformed, and the other lens barrel is connected. In order to provide the snap fit 9a, a space for providing a large notch 9b is required. Depending on the arrangement of other cams or the like, it is difficult to provide the notch 9b, and there is a problem in that the strength of the lens barrel is reduced.

An object of the present invention is to provide a set stand barrel that can be constructed compact lens barrel unit while preventing decrease in strength.

In order to achieve the above object, an assembling barrel according to the present invention has a lens holding means for holding a lens and a rotation restricting portion for restricting the rotation of the lens holding means, and restricts the straight movement of the lens holding means. A straight movement restricting means, a first cam provided therein, a first cam means for moving the lens holding means in the optical axis direction by the first cam and the rotation restricting portion, and the first cam means are extended. Rutotomoni comprising a slit-shaped through-shaped cam for operating said arranged on both sides of the through-shaped cam in the optical axis direction, the first engagement portion projecting radially outward at the object side outer peripheral portion and an image pickup a second engagement portion projecting radially outward at side peripheral portion, and the through-shaped cam slit by an elastic deformable second cam means to said optical axis, said at the object-side outer peripheral portion first 1 engagement It has a first position regulating portion for engaging, the first lens-barrel component means and a second position regulating portion for engagement with the second engaging portion with the imaging surface side outer peripheral portion and the first In a state in which the lens barrel constituting unit is incorporated in the second cam unit, the second cam unit is restored from elastic deformation, and the first engaging portion, the first position restricting portion, and the second The first lens barrel constituting means is held between the first engaging part and the second engaging part by the engagement between the engaging part and the second position restricting part, and the second cam means and the first The positional relationship with the lens barrel constituting means is defined.

According to the present invention, when the first lens-barrel component unit is incorporated in the second cam means, the second cam means is elastically deformed in the optical axis direction, the first lens-barrel component means a second cam means and the snap-fit Combined. As a result, the second cam means and the first lens barrel constituting means can be connected without increasing the size of the entire lens barrel unit, and thus a small lens barrel unit can be constituted while preventing a decrease in strength. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 shows the state at the time of photographing of digital camera comprising the engaging Ru set stand barrel to the embodiment of the present invention is a perspective view schematically illustrating, FIG. 2, in Figure 1 of the digital camera at the time of non-shooting It is a perspective view which shows a state roughly.

  1 and 2, on the front side (subject side) of the digital camera 15, a finder 14 that determines the composition of the subject, a photometric distance measuring sensor 13 that performs photometric distance measurement, and red-eye that prevents red-eye of the subject image. A lamp 16, a strobe 17 that irradiates a subject, a photographing lens barrel 10 in which the first lens group 10a is disposed, and a front surface of the photographing lens barrel 10 housed in the digital camera 15 are provided. And a slide barrier member 18 that opens the photographing lens barrel 10 by sliding in the lateral direction (longitudinal direction of the digital camera 15) during photographing.

  The digital camera 15 is a so-called slide barrier type camera, and at the time of shooting, the slide barrier member 18 is slid laterally with respect to the camera body of the digital camera 15 (FIG. 1). Thereby, the taking lens barrel 10 is opened in the direction of the subject.

  On the other hand, at the time of non-photographing, after the photographing lens barrel 10 is accommodated in the camera body of the digital camera 15, the slide barrier member 18 is slid in the direction opposite to the moving direction at the time of photographing. As a result, the front surface of the photographic lens barrel 10, the photometric distance measuring sensor 13, the finder 14 and the red-eye lamp 16 are covered with the slide barrier member 18 (FIG. 2).

  3 is a top view of the digital camera 15 of FIG. 1, and FIG. 4 is a bottom view of the digital camera 15 of FIG.

  3 and 4, the digital camera 15 includes a release button 11 and a flash mode button 12 on the top surface, and a tripod mounting portion 21, a memory card drive 36 and a battery insertion portion (not shown) on the bottom surface. And a card battery cover 22 provided therein. Further, a strap holding means 20 is provided on one side surface of the digital camera 15, and an external input / output terminal mounting portion 19 is provided on the other side surface.

  FIG. 5 is a side view of the digital camera 15 of FIG. 2 as viewed from the user side.

  In FIG. 5, the digital camera 15 includes an operation button 24 including a plurality of buttons, a display 25 including an LCD, a zoom button 23, and a viewfinder eyepiece 14a on the back surface thereof.

  When any one of the operation buttons 24 is pressed, an operation mode of the digital camera 15 set corresponding to each button, for example, a shooting mode, a playback mode, or a moving image shooting mode is selected.

  The display 25 is image display means, and displays on the screen image data stored in a memory 34 described later and image data read from a memory card. When the operation mode is selected, a plurality of shooting data is reduced and displayed on the screen.

  FIG. 6 is a block diagram schematically showing the configuration of the digital camera 15 of FIG.

  In FIG. 6, the control system of the digital camera 15 includes a CPU 40, a ROM 39, and a RAM 41, and a power switch 18 a that is linked to the operations of the release button 11, the operation button 24, the display 25, and the slide barrier member 18 via the bus 38. The memory 34, compression / expansion means 35, and memory card drive 36 are connected to each other. The ROM 39 stores a control program for controlling each component described later. The RAM 41 stores data necessary for each control program.

  A driving circuit 37 connected to the control system via the bus 38 includes a zoom motor driving unit 26 that drives the photographing lens barrel 10 with a zoom motor, and a focus motor driving unit that drives the focusing unit 27 with a focus motor. 28, a shutter driving means 29 for driving the shutter means 30, an aperture driving means 44 for driving the aperture means 43, a photometric distance measuring sensor comprising a photometric sensor 113a and a distance measuring sensor 13b, an imaging device 42 such as a CCD or CMOS, And a strobe 17 are connected to control the driving of each driving means by a signal from the control system.

  In the digital camera 15 configured as described above, when the user slides the slide barrier member 18 and turns the power switch 18a from OFF to ON, the CPU 40 reads a necessary control program from the ROM 39 and starts an initial operation. That is, after the barrier opening operation of the slide barrier member 18 is performed, the digital camera 15 is brought into a photographing standby state by moving the photographing lens barrel 10 to a predetermined photographing possible region.

  When the release button 11 is pressed to take a picture, the brightness of the subject is measured by the photometric sensor 13a, the aperture value and shutter speed are determined based on the photometric value, and the necessity of the flash 17 is determined. . Note that the presence or absence of forced strobe light emission can be selected in advance by operating the operation button 24. Next, the distance sensor 13b measures the distance from the digital camera 15 to the subject, and drives the focus motor drive means 28 based on the measured distance, thereby moving the focus means 27 to a predetermined focus position. Thereafter, the shutter unit 30 is opened and closed, and a desired image is taken into the imaging device 42.

  In the imaging device 42, charges corresponding to the amount of light incident from the photographic lens barrel 10 are accumulated based on the exposure control value, and the charges are converted into image data and output to the analog signal processing means 31.

  The analog signal processing unit 31 performs analog processing on the captured image data and outputs analog data obtained from the image data to the A / D conversion unit 32. The A / D converter 32 converts the captured analog data into digital data, and outputs this digital data to the digital signal processing means 33. The digital signal processing means 33 performs various processes on the digital data output from the A / D conversion unit 32. The image data that has been subjected to various processes is temporarily stored in the memory 34.

  The compression / decompression means 35 performs compression processing such as JPEG or TIFF on the image data stored in the memory 34 based on the operation of the operation button 24, and stores the compressed image data in the memory 34 again. In the case of a digital camera that does not include the memory 34, the image data processed by the digital signal processing means 33 is output to the compression / expansion means 35, and the compressed image data is stored in the memory card drive 36.

  Further, the image data stored in the memory 34 or the image data stored in the memory card drive 36 is subjected to expansion processing by the compression / expansion means 35, and the expanded image is displayed on the display 25 via the bus 38. Can be displayed. When the user looks at the image displayed on the display 25 and the image is unnecessary, the image data stored in the memory 34 or the memory card drive 36 is erased by operating the operation button 24. Can do.

  The zoom button 23 is arranged on the back surface of the digital camera 15 as described above, and the driving of the zoom motor driving means 26 is controlled via the drive circuit 37 by the operation of the zoom button 23, and the photographing lens barrel 10 is moved. Move in the direction of the optical axis of the lens. In addition, so-called digital zoom can be performed in which an image displayed on the display 25 is enlarged and reduced by operating the zoom button 23.

  Next, the configuration of the lens barrel unit of the digital camera 15 will be described.

  FIG. 7 is an exploded perspective view schematically showing an internal configuration of a lens barrel unit having the photographing lens barrel 10 in FIG.

In FIG. 7, the lens barrel unit includes a first lens holding means 10 that holds the first lens group 10a, a first cam means 1 provided with a first cam that engages with the first lens holding means 10, and A straight movement restricting means 8 that restricts the straight movement of the first lens holding means 10, a second lens holding means 2 that holds the second lens group, a third lens holding means 3 that holds the third lens group, and a later-described first lens holding means 2. A second cam means (cam means) 4 incorporated integrally with one lens barrel constituting means 5 and a second cam engaging with the second lens holding means 2 are provided inside, and the second cam means 4 The first lens barrel constituting means 5 that can move integrally in the optical axis direction, the third cam means 6 provided with the third cam that engages with the first lens barrel constituting means 5, and the third cam means 6 And is rotated through a plurality of gears by the zoom motor driving means 26. And a barrel rotating means 7. Second cam means 4 and the first lens-barrel component unit 5 constitutes the engagement Ru set stand barrel to the present embodiment.

  In this barrel unit, optical zooming is performed by moving the first lens holding means 10, the second lens holding means 2, and the third lens holding means 3 that hold the lens group 10a in the optical axis direction. ing.

  The first lens holding means 10 can be moved in the optical axis direction by a first cam provided inside the first cam means 1, and the rotation of the first lens holding means 10 is restricted by a rotation restricting portion 8 a provided in the straight travel restricting means 8. . The first cam means 1 performs a feeding operation by a penetrating cam 4a, which will be described later, and obtains a rotational force by the first lens barrel constituting means 5.

  The second lens holding means 2 is restricted in rotation by a rotation restricting portion 8 b provided in the straight movement restricting means 8, and is moved back and forth along the optical axis direction by a second cam provided in the first barrel forming means 5. Moving.

  The third lens holding means 3 is regulated by the second cam means 4 so that it can move in the direction of the optical axis by the second cam provided inside the first lens barrel constituting means 5. At this time, the first lens barrel constituting means 5 moves integrally with the second cam means 4.

  The first lens barrel constituting means 5 can be moved in the optical axis direction by a third cam provided in the third cam means 6, and the zoom motor driving means 26 to the lens barrel rotating means 7 and the third cam means. 6 is rotated by the driving force transmitted through 6.

  FIG. 8 is a development view of the second cam means 4 in FIG.

In FIG. 8, the second cam means 4 includes a substantially cylindrical lens barrel body 4e in which slit-like penetrating cams (penetrating cams) 4a are provided at equal intervals along the circumferential direction thereof, and a lens barrel body 4e. An engagement portion (first engagement portion ) 4b that is provided on the outer peripheral portion of the subject side at equal intervals and protrudes in the radial direction of the barrel main body 4e so as to be engaged with the first barrel forming means 5; 4e includes a circular engagement portion (second engagement portion ) 4d that protrudes in the radial direction of the barrel main body 4e so as to be engaged with the first barrel forming means 5 and provided on the outer peripheral portion on the imaging surface side.

  The penetrating cam 4a is formed of a substantially elongated hole, and the cam surface 4g in the longitudinal direction of the hole is formed substantially parallel to the outer peripheral surface on the subject side of the lens barrel body 4e.

  The engaging portion 4b is provided on the outer peripheral portion on the subject side of the second cam means 4, and the circular engaging portion 4d is provided on the outer peripheral portion on the imaging surface side. Therefore, the engaging portion 4b and the circular engaging portion 4d are disposed on both sides with respect to the penetrating cam 4a in the optical axis direction of the second cam means, and the first barrel forming means 5 includes the engaging portion 4b and the circular shape. It is incorporated between the engaging portions 4d. The first lens barrel constituting means 5 is incorporated between the hook-shaped engagement portion 4b that is snap-fit coupled and the circular engagement portion 4d that acts as positioning at the time of connection, thereby forming a small lens barrel unit. Can do.

  When receiving a tensile stress along the optical axis direction, the lens barrel body 4e is elastically deformed in the optical axis direction due to the notch shape of the penetrating cam 4a. The engaging portion 4b is provided closer to the subject than the penetrating cam 4a, and moves in the direction of the subject along with the elastic deformation of the lens barrel body 4e. As a result, the first lens barrel constituting means 5 is integrated into the second cam means 4 by elastic deformation of a portion defined by the through cam 4a in the lens barrel body 4e, and is snap-fit coupled to the second cam means 4. Is done.

  FIG. 9 is a perspective view showing a state before the second cam means 4 and the first lens barrel constituting means 5 in FIG. 7 are assembled.

  As shown in FIG. 9, the first barrel forming means 5 engages with the position restricting portion 5a that engages with the engaging portion 4b at the outer peripheral portion on the subject side, and with the circular engaging portion 4d at the outer peripheral portion on the imaging surface side. Thus, a position restricting portion 5b for restricting the position of the first barrel forming means 5 is provided.

  When the second cam means 4 and the first lens barrel constituting means 5 are assembled, the first lens barrel constituting means 5 is sandwiched between the engaging portion 4b and the circular engaging portion 4d. At this time, the circular engaging portion 4 d is in surface contact with the position restricting portion 5 b of the first lens barrel constituting means 5, and the engaging portion 4 b is in surface contact with the position restricting portion 5 a of the first lens barrel constituting means 5. Thereby, the positional relationship between the second cam means 4 and the first lens barrel constituting means 5 is kept constant.

  FIG. 10 is a perspective view showing a state after the second cam means 4 and the first lens barrel constituting means 5 of FIG. 9 are assembled.

  As shown in FIG. 10, the engaging portion 4 b moves in the optical axis direction along with the elastic deformation of the lens barrel body 4 e, and after the first lens barrel constituting means 5 is incorporated in the second cam means 4, The position restricting portion 5a is held by returning to the position. Thereby, the 2nd cam means 4 and the 1st lens barrel structure means 5 can be assembled with a sufficient precision.

Further, the first lens barrel constituting means 5 has another cam having the same locus as that of the penetrating cam (penetrating cam) 4a on the back side (inner side of the lens barrel). Thereby, another lens barrel can be driven using the inner surface of the first lens barrel constituting means 5. Further, the second cam means 4 has other rectilinear restriction means for restricting the third lens holding means 3 (other lens holding means) to go straight on the back side (inside the lens barrel). Thereby, the second cam means 4 can be provided with a plurality of functions, and the driving efficiency of the lens barrel unit can be increased.

  FIG. 11 is a flowchart showing the operation of the digital camera 15 from power ON to the end of shooting.

  In FIG. 11, when the user turns on the power of the digital camera 15 (step S11), the CPU 40 sends a command to the zoom motor driving means 26 and rotates the zoom motor driving means 26 clockwise (CW rotation) (step S12). ). Thereafter, a predetermined operation is performed to move the photographing lens barrel means 10 to the photographing position (step S13), and the movement of the photographing lens barrel means 10 is stopped.

  Next, when the user turns on the release button (step S14), photometry is performed by the photometric sensor 13a (step S15), and luminance information of the subject is obtained. It is determined whether or not the obtained luminance information is higher than a predetermined luminance (step S16). If the luminance information is high, the diaphragm means 43 is inserted in the optical axis (step S17), and the amount of incident light is changed. . If the obtained luminance information is lower than the predetermined luminance (NO in step S16), the aperture means 43 is not operated and the state is retracted from the optical axis, and the process proceeds to step S18.

  Thereafter, the focus unit 27 is moved to a position where the subject is in focus (step S18), and image capture is started (step S19). Next, the shutter means 30 is operated to move from the open state to the closed state (step S20), the incident light quantity is blocked, and the image capturing is terminated (step S21). Thereafter, the aperture means 43 is retracted from the optical axis (step S22), the focus means is moved to the initial position (step S23), and the photographing operation is completed.

  FIG. 12 is a flowchart showing the operation of the digital camera 15 when the power is turned off.

  In FIG. 12, when the user turns off the power of the digital camera 15 (step S31), the shutter means 30 is moved to the closed position (step S32), and it is confirmed that the aperture means 43 is in the retracted position (step S33). ), The zoom motor is rotated counterclockwise (CCW rotation) (step S34), and the taking lens barrel 10 is stored in a predetermined position (step S35), and this operation is finished.

  According to this embodiment, the second cam means 4 provided with the through cam 4a and configured to be elastically deformed, and the second cam means 4 are integrated with the second cam means 4 by elastic deformation of the portion defined by the through cam 4a. Since the first lens barrel constituting means 5 is incorporated, the first lens barrel constituting means 5 is snap-fit coupled to the second cam means 4 having the penetrating cam 4a. Thus, the second cam means 4 and the first lens barrel constituting means 5 can be connected without increasing the size of the entire lens barrel unit, and thus a small lens barrel unit can be constructed while preventing a decrease in strength. Can do. Further, the second cam means 4 and the first lens barrel constituting means 5 can be efficiently integrated integrally, and a lens barrel unit that can cope with further higher magnification and smaller size of a recent digital camera is constructed. Can do.

In the present embodiment, the digital camera 15 with a set stand barrel is described as an example, not limited thereto, Ru engaged with the present embodiment analog camera or the like using a video camera or a silver halide film set A vertical column can be applied.

It is a perspective view which shows roughly the state at the time of imaging | photography of a digital camera provided with the lens barrel assembly structure which concerns on embodiment of this invention. It is a perspective view which shows roughly the state at the time of the non-shooting of the digital camera of FIG. It is a top view of the digital camera of FIG. FIG. 3 is a bottom view of the digital camera of FIG. 2. It is the side view which looked at the digital camera of FIG. 2 from the user side. FIG. 2 is a block diagram schematically showing a configuration of the digital camera of FIG. 1. FIG. 7 is a perspective view schematically showing a configuration of a lens barrel unit having a photographic lens barrel in FIG. 6. It is an expanded view of the 2nd cam means in FIG. It is a perspective view which shows the state before the 2nd cam means in FIG. FIG. 10 is a perspective view showing a state after the second cam means and first lens barrel constituting means of FIG. 9 are assembled. 6 is a flowchart showing the operation of the digital camera from power ON to the end of shooting. It is a flowchart which shows the operation | movement of a digital camera when a power supply is turned off. It is an expanded view which shows the conventional lens-barrel assembly structure.

Explanation of symbols

1 First cam means 1
2 Second lens holding means 3 Third lens holding means 4 Second cam means 4a Through cam 5 First lens barrel constituting means 6 Third cam means 8 Straight-running restricting means 10 First lens holding means 10a First lens group

Claims (5)

Lens holding means for holding the lens;
A rotation restricting portion for restricting rotation of the lens holding means, and a rectilinear restriction means for restricting straight movement of the lens holding means;
A first cam provided therein, the first cam means for moving the lens holding means in the optical axis direction by the first cam and the rotation restricting portion;
Rutotomoni comprising a slit-shaped through-shaped cam for operating feeding said first cam means are disposed on both sides of the through-shaped cam in the optical axis direction, projects radially outward at the object side outer peripheral portion A second cam means comprising a first engagement portion and a second engagement portion projecting radially outward at the imaging surface side outer peripheral portion, and elastically deformable in the optical axis direction by a slit shape of the penetrating cam ;
First with a first position regulating portion that engages the first engagement portion in the object-side outer peripheral portion, and a second position regulating portion for engagement with the second engaging portion with the imaging surface side outer peripheral portion A lens barrel constituting means,
In a state where the first lens barrel constituting means is incorporated in the second cam means, the second cam means is returned from elastic deformation, and the first engaging portion, the first position restricting portion, and The first lens barrel constituting means is held between the first engaging part and the second engaging part by the engagement of the second engaging part and the second position restricting part, and the second cam means An assembly lens barrel characterized by defining a positional relationship with the first lens barrel constituting means. Assembly barrel according to claim 1, wherein said first lens-barrel component means, characterized in that it comprises a cam having said through-shaped cam and the same locus on the inside. The other lens holding means for holding the lens, which is located at a later stage than the lens holding means,
The assembly barrel according to claim 1 or 2 , wherein the second cam means includes, on the inner side thereof, other straight advance restricting means for restricting the other lens holding means to advance straight. The said 2nd cam means is a substantially cylindrical shape, The said penetration cam is formed in the circumferential direction of the said 2nd cam means at equal intervals, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The assembly lens barrel described in the item. It said first engaging portion is a hook-shaped engagement portion projecting radially outward of said second cam means provided at one end of the second cam means,
The said 2nd engaging part is a circular engaging part which is provided in the whole other end of the said 2nd cam means, and protrudes in the radial direction outer side of the said 2nd cam means, The 1st thru | or 4 characterized by the above-mentioned. The assembly lens barrel according to claim 1.