JP2007071907A - Lens position adjustment mechanism, lens device, and optical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel capable of making an easy adjustment with a high degree of freedom and contributing to the miniaturization of a device. <P>SOLUTION: By vertically moving an adjustment part 92, a second plate spring 80 is slid along a second long hole 90. Consequently, a lens holding frame 50 connected to the second plate spring 80 is rotated around a first guide pin 70 by the slide, and a third photographic lens 52 is vertically moved. In addition, by moving the adjustment part 92 sidewise, the second plate spring 80 is rotated around a second guide pin 94. Consequently, the lens holding frame 50 connected to the second plate spring 80 is slid along a first long hole 72 by the rotation, and the third photographic lens 52 is moved left and right. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a lens position adjustment mechanism for adjusting a lens position by moving a lens holding frame installed in a lens barrel on an installation surface perpendicular to a lens optical axis on which the lens holding frame is installed, and The present invention relates to a lens apparatus provided with such a range position adjusting mechanism and an optical apparatus.

  Digital cameras that acquire a subject image formed by a photographing lens as digital image data using an image sensor such as a CCD or CMOS are widely used. The photographing lens is composed of a plurality of lenses. Each lens is incorporated in a lens holding frame and arranged in a lens barrel.

  It is preferable that each lens is aligned on a straight line so that its center (optical axis) coincides with the photographing optical axis. However, due to problems such as the accuracy of the mounting portion to which the lens holding frame is attached, the center of each lens is photographed. There was a problem that it was displaced from the optical axis. For this reason, in the lens holding frame described in Patent Document 1 below, play is provided between the lens holding frame and a mounting portion to which the lens holding frame is attached, so that the lens position can be adjusted.

For example, in a lens device used for a camera, a shutter device, a diaphragm, and the like are arranged before and after the photographing lens, and therefore the lens holding frame cannot be moved from the optical axis direction. Therefore, a plurality of adjustment openings are provided on the side surface of the lens barrel in which the lens holding frame is housed to expose the side portions of the lens holding frame from different angular positions, and the lens is held from each adjustment opening using tweezers. The lens position can be adjusted by pushing the frame.
JP 2002-318335 A

  However, as described above, when the side of the lens holding frame is pushed from various angular positions, the adjustment is performed while changing the device or tweezers, so that the adjustment is troublesome and the adjustment takes time. There was a problem. Further, since the lens holding frame is directly moved, there is a problem that fine adjustment is difficult.

  The present invention has been made in view of the above background, and can easily perform adjustment with a high degree of freedom and easy fine adjustment, and a lens apparatus including such a range position adjustment mechanism. In addition, an object of the present invention is to provide an optical device.

  In order to achieve the above object, the lens barrel of the present invention moves the lens holding frame installed in the lens barrel on an installation surface perpendicular to the lens optical axis on which the lens holding frame is installed. In the lens position adjusting mechanism that adjusts the lens position, the first guide portion provided on the side portion of the lens holding frame, the first guide portion, and the installation surface are provided on the installation surface, First guide means for guiding the lens holding frame so as to be movable in a first direction connecting the first guide portion and the lens optical axis, and supporting the lens holding frame so that the lens holding frame can rotate around the guide position; An adjustment member provided in a second direction orthogonal to the first direction on the installation surface and having an adjustment portion provided at one end portion exposed from a side surface of the lens barrel; and the other end of the adjustment member A second guide portion provided in the portion, and A second guide means which is provided on the mounting surface and guides the adjustment member so as to be movable in the second direction, and supports the adjustment member so that the adjustment member can rotate around the guide position; and a side portion of the lens holding frame. A linkage portion provided at a position facing the first guide portion across the lens optical axis, an intermediate portion provided between the adjustment portion of the adjustment member and the second guide portion, and the linkage portion. Provided on the installation surface, wherein the adjustment member and the lens holding frame are rotatably linked to each other, and the lens holding frame has the adjustment portion moved in the first direction. When the adjustment member is rotated around the second guide means, it is moved in the first direction by the linkage means, the adjustment portion is moved in the second direction, and the adjustment member is moved in the second direction. When it is moved to Is characterized in that I is rotated about the first guide means.

  The first guide means and the second guide means are provided in any one of the components, and are elongated holes formed along the moving direction, and the guide pins provided in the other and inserted into the elongated holes, Preferably it consists of.

  Further, it is preferable to provide a first urging means and a second urging means for pressing the first guide portion and the linking portion against the installation surface and holding the lens holding frame at the adjustment position. .

  Furthermore, it is preferable that the adjusting member is formed by a leaf spring and used as the second urging means.

  The adjusting unit is exposed from an opening formed so as to penetrate the side surface of the lens barrel, and when the adjusting unit is moved in the first direction and the second direction, It is preferable not to protrude from the side surface.

  Furthermore, the lens device of the present invention includes a lens holding frame for holding a lens, a lens barrel in which the lens holding frame is incorporated, and a lens optical axis provided in the lens barrel and provided with the lens holding frame. In a lens apparatus comprising a vertical installation surface and a lens position adjustment mechanism for adjusting the position of the lens with respect to the lens optical axis by moving the lens holding frame on the installation surface, the lens position adjustment mechanism as described above is used. It is characterized by that.

  It is preferable that after the lens position is adjusted by the lens position adjusting mechanism, the lens holding frame and the lens barrel are bonded by an adhesive.

  Further, the optical device may be configured using the lens position adjusting mechanism described above.

  In the lens barrel of the present invention, the lens holding frame can be moved in the first and second directions orthogonal to each other by moving the adjusting unit exposed from the side surface of the lens barrel. Compared with the case where the side portion of the lens holding frame is pushed and moved, the adjustment is simple.

  Further, the adjustment member is linked with the lens holding frame at an intermediate portion between the second guide means and the adjustment portion. Further, the lens holding frame is provided with a first guide portion and a linkage portion linked to the adjustment member at positions facing each other across the lens optical axis. Thereby, when the adjustment unit is moved, the lens holding frame moves by about half of the movement amount of the adjustment unit, so that fine adjustment is easy.

  1 and 2 show the appearance of a digital camera equipped with the lens barrel of the present invention. On the front surface of the digital camera 2, a strobe light emitting unit 3 that irradiates a strobe light is provided at the upper center of the digital camera 2, and a photographing opening 4 is provided beside it. The lens of the lens barrel 5 disposed inside the digital camera 2 is exposed from the photographing opening 4. A power button 6 and a release button 7 are arranged on the upper surface of the digital camera 2. By pressing the release button 7, a still image for one frame is shot, and image data obtained by this shooting is recorded on a memory card 8 (see FIG. 3) mounted on the digital camera.

  As shown in FIG. 2, on the back of the digital camera 2, an LCD (liquid crystal display) 10, a zoom button 11 that zooms the zoom lens barrel 5 to the telephoto side and the wide-angle side, and the digital camera 2 A cursor button 12 for performing various operations and settings is provided. By operating the cursor button 12 and giving an instruction while looking at the menu displayed on the LCD 10, various settings such as switching between the shooting mode and the playback mode, and turning on / off the strobe light can be performed.

  Under the shooting mode, the LCD 10 displays the subject image being shot as a moving image, and the user can know the shooting range by observing the through image. Further, under the playback mode, an image recorded on the memory card 8 can be selected and displayed on the LCD 10.

  The electrical configuration of the digital camera 2 is shown in FIG. The CPU 15 controls each part of the digital camera 2 based on operation signals from the release button 7, the zoom button 11, and the cursor button 12. The CPU 15 includes a ROM 15a and a RAM 15b. The ROM 15a stores programs of various sequences such as a shooting sequence, and the CPU 15 controls each unit according to this program. The RAM 15b is used as a working memory when the CPU 15 controls various sequences.

  The drive circuit 17 drives a zoom and focus adjustment motor assembled in the lens barrel 5 and an actuator of the shutter device under the control of the CPU 15. The CCD image sensor 18 that is a solid-state imaging device receives subject light transmitted through the lens barrel 5 on its light receiving surface, converts the subject image into an analog photographing signal, and outputs it. In this example, the CCD image sensor 18 is used for photographing, but the image sensor is not limited to this, and a CMOS image sensor, for example, may be used.

  Under the shooting mode, the signal processing unit 19 performs noise removal, amplification, and conversion to image data on the shooting signal, then performs white balance and γ correction, and sequentially processes the processed image data to the LCD driver. Send to 21. As a result, the subject image being shot is displayed on the LCD 10 as a through image. When the release button 7 is pressed in the shooting mode, the signal processing unit 19 compresses image data for one frame obtained by shooting immediately after that and records it in the memory card 8 via the interface circuit 22. . Note that the recording medium is not limited to the memory card, and various types of recording media can be used, and the image data may be recorded in the internal memory of the digital camera 2.

  Under the playback mode, image data is read from the memory card 8 by the interface circuit 22, subjected to various processing by the signal processing unit 19, and then sent to the LCD driver 21. Thereby, the image recorded on the memory card 8 is displayed on the LCD 10.

  The signal processing unit 19 includes a circuit for detecting subject brightness and detecting contrast of the image data based on the image data, and sends the detected subject brightness and contrast information to the CPU 15, respectively. The CPU 15 controls the shutter speed and the aperture based on the subject luminance information from the signal processing unit 19 and controls the focus adjustment based on the contrast information.

  As shown in FIG. 4, the lens barrel 5 includes an upper barrel 30 and a lower barrel 32. After the upper lens barrel 30 and the lower lens barrel 32 are combined, they are fixed with, for example, screws. A shutter device 34 and a first photographing lens group 36 are incorporated in the upper barrel 30. The first photographic lens group 36 includes six lenses 36a to 36f. These lenses 36 a to 36 f are positioned in the upper barrel 30 so that the optical axes (centers) of the lenses 36 a to 36 f are aligned with the photographing optical axis 38.

  The lens 36 a is exposed on the front surface of the digital camera 2 and takes in subject light into the lens barrel 5. A prism 40 is disposed behind the lens 36a. The prism 40 refracts the subject light taken into the lens barrel 5 by the lens 36a downward. The prism 40 suppresses the length of the lens barrel 5 in the horizontal direction, thereby making the digital camera 2 thinner.

  The lenses 36 b and 36 c are fixed lenses and are held by a fixed lens holder 42 disposed below the prism 40. The lenses 36 d, 36 e, and 36 f are moving lenses that constitute the zoom lens, and are held by the zoom lens holder 44. The zoom lens holder 44 is connected to a moving mechanism (not shown) including a motor, and is moved in the direction of the photographing optical axis 38 in accordance with the operation of the zoom button 11. Thereby, zoom magnification is changed.

  A second photographic lens group 46 is incorporated in the lower barrel 32. The second photographic lens group 46 includes three lenses 46a to 46c. These lenses 46 a to 46 c are positioned in the lower barrel 32 so that the optical axes (centers) of the lenses 46 a to 46 c are aligned with the photographing optical axis 38. The second photographic lens group 46 is a moving lens constituting a focus lens, and is held by a focus lens holder 48. The focus lens holder 48 is connected to a moving mechanism (not shown) including a motor, and is moved in the direction of the photographing optical axis 38 when performing focus adjustment. In focus adjustment, the second photographic lens group 46 is moved to a position where the contrast of the live view image becomes the highest, based on the principle that the contrast of the obtained image is higher as the focus is adjusted.

  The lens barrel 5 is provided with a lens holding frame 50 so as to be sandwiched between the upper barrel 30 and the lower barrel 32, and the third photographing lens 52 is incorporated in the lens holding frame 50. ing. As shown in FIGS. 5 and 6, the lens holding frame 50 is disposed on an installation surface 54 formed on the upper surface of the lower barrel 32. The installation surface 54 is formed perpendicular to the photographing optical axis 38, and the third photographing lens 52 is held in a state where the lens surface is perpendicular to the photographing optical axis 38. The lens holding frame 50 is provided with a first guide portion 56 and a linkage portion 58 at positions facing each other with the photographing optical axis 38 interposed therebetween, and a position orthogonal to the first guide portion 56 and the linkage portion 58. In addition, adhesive portions 60 and 62 are provided.

  A first guide pin 70 parallel to the photographic optical axis 38 is provided on the lower surface of the first guide portion 56. The installation surface 54 is provided with a first elongated hole 72 that is perpendicular to the photographing optical axis 38 and is long in the direction connecting the first guide portion 56 and the linkage portion 58. The first guide pin 70 is inserted through the first long hole 72. As a result, the first guide portion 56 is coupled to the installation surface 54, and the lens holding frame 50 is rotatable about the first guide pin 70 and slidable along the first elongated hole 72. ing.

  A first leaf spring 74 is disposed on the upper surface of the first guide portion 56. The first leaf spring 74 is disposed so as to cross the upper surface of the first guide portion 56, the central portion in the longitudinal direction is in contact with the upper surface of the first guide portion 56, and both longitudinal ends are provided on the side wall of the lower barrel 32. The openings 76 and 78 are respectively fitted. The first leaf spring 74 presses the first guide portion 56 against the installation surface 54 by the central portion in the longitudinal direction in contact with the upper surface of the first guide portion 56.

  A second leaf spring 80 that is long in the direction perpendicular to the longitudinal direction of the first elongated hole 72 is disposed on the upper surface of the linking portion 58. The second leaf spring 80 is disposed so as to cross the upper surface of the linking portion 58, and the projection 84 provided on the upper surface of the linking portion 58 is fitted into the opening 82 provided in the central portion in the longitudinal direction. 58 is engaged. The second leaf spring 80 is fitted into openings 86 and 88 provided in the side wall of the lower barrel 32 at both ends in the longitudinal direction, and presses the linkage portion 58 against the installation surface 54 by the central portion in the longitudinal direction. .

  Further, the second leaf spring 80 functions as an urging member that presses the linkage portion 58 against the installation surface 54, and moves the engaged lens holding frame 50 to adjust the position of the third photographic lens 52. It also has a function as an adjustment member. For this reason, a second guide part 89 and an adjustment part 92 are formed in the second leaf spring 80 with the opening 82 interposed therebetween.

  The second guide portion 89 is provided with a second elongated hole 90 that is formed long in a direction perpendicular to the longitudinal direction of the first elongated hole 72. A second guide pin 94 erected on the installation surface 54 is inserted into the second long hole 90. Thereby, the second leaf spring 80 is rotatable about the second guide pin 94 and is slidable along the second elongated hole 90.

  The adjustment unit 92 is exposed from the opening 88. The adjustment portion 92 is formed with constrictions on both sides so that it can be easily held by an adjustment tool used when adjusting the position of the third photographic lens 52. Further, the adjustment unit 92 is disposed in the inner portion of the opening 88 so as not to have the unevenness of the surface of the lower barrel 32 and to make the lower barrel 32 compact, and does not protrude from the lower barrel 32. .

  As shown in FIGS. 7A and 7B, when the adjusting portion 92 is moved up and down in the drawing, the second leaf spring 80 slides along the second elongated hole 90. As a result of this sliding, the lens holding frame 50 connected to the second leaf spring 80 rotates around the first guide pin 70, and the third photographing lens 52 moves up and down in the drawing. The third photographic lens 52 is disposed approximately in the middle between the linkage portion 58 in which the lens holding frame 50 is connected to the second leaf spring 80 and the first guide pin 70. Therefore, by moving the adjustment unit 92 up and down in the drawing, the third photographic lens 52 moves up and down in the drawing by about half of the movement amount of the linkage unit 58, that is, about half of the movement amount of the adjustment unit 92. To do.

  Further, as shown in FIGS. 8A and 8B, when the adjustment portion 92 is moved to the left and right in the drawing, the second leaf spring 80 rotates around the second guide pin 94. As a result of this rotation, the lens holding frame 50 connected to the second leaf spring 80 slides along the first slot 72, and the third photographic lens 52 moves left and right in the drawing. The second leaf spring 80 is connected to the lens holding frame 50 at the center in the longitudinal direction, which is substantially in the middle between the second guide pin 94 and the adjustment portion 92. Therefore, by moving the adjustment unit 92 left and right in the drawing, the third photographing lens 52 has an amount corresponding to the movement amount of the central portion in the longitudinal direction of the second leaf spring 80, that is, the movement amount of the adjustment unit 92. Move left and right in the figure by about half.

  The adhesive portions 60 and 62 are exposed from the openings 100 and 102 provided on the side wall of the lower barrel 32. The openings 100 and 102 are formed in a size having a margin so as not to prevent the movement of the lens holding frame 50. Then, after adjusting the position by moving the third photographic lens 52 as described above, an adhesive is injected from the openings 100 and 102, and the bonding portions 60 and 62 are bonded to the lower barrel 32, so that the lens The holding frame 50 is fixed.

  The operation of the present invention having the above configuration will be described below. When the lens barrel 5 is assembled, the lens holding frame 50 holding the third photographing lens 52 is attached to the installation surface 54 so as to be pressed by the first plate spring 74 and the second plate spring 80. Thereafter, in a state where the lens holding frame 50 is sandwiched, the lower barrel 32 and the upper barrel 30 are combined and screwed together.

  After the lens barrel 5 is assembled as described above, the third photographing lens 52 is moved and the position is adjusted so that the center of the third photographing lens 52 coincides with the photographing optical axis 38. The position of the third photographic lens 52 is adjusted by holding the adjusting portion 92 exposed in the opening 88 of the lower barrel 32 with an adjusting tool and moving it in a plane perpendicular to the photographic optical axis 38. Is called. After the position adjustment of the third photographic lens 52 is completed, an adhesive is injected from the openings 100 and 102, and the lens holding frame 50 is fixed to the lower barrel 32.

  As described above, since the lens can be moved in a plurality of directions by moving the adjusting portion, the adjustment is simple as compared with the case where the side portion of the lens holding frame is pushed away from various angular positions. Furthermore, the photographing lens moves in the direction corresponding to the moving direction of the adjusting unit by about half of the moving amount of the adjusting unit, which is convenient for fine adjustment.

  In addition, since the lens holding frame is pressed against the lower barrel by the leaf spring, the lens holding frame is not rattled during the adjustment, so that a reliable adjustment can be performed. Furthermore, since this leaf spring is also used as the adjustment member, it is possible to suppress an increase in the size of the apparatus as compared with the case where the leaf spring and the adjustment member are provided separately.

  The specific configuration of the lens barrel is not limited to the above embodiment, and can be changed as appropriate. For example, in the above embodiment, the example in which the arrangement position of one lens in the lens barrel is adjusted has been described. However, the present invention is not limited to this, and the arrangement position of a plurality of lenses may be adjusted. .

It is a front side external view of a digital camera. It is a back side external view of a digital camera. It is a block diagram showing the structure of a digital camera. It is sectional drawing of a lens-barrel. It is explanatory drawing showing the state which attached the lens holding frame to the lower lens barrel. It is an exploded view showing the state which removed the lens holding frame from the lower lens barrel. It is explanatory drawing showing the mode of a movement of the 3rd lens at the time of moving an adjustment part to the longitudinal direction of an adjustment member. It is explanatory drawing showing the mode of a movement of the 3rd lens at the time of moving an adjustment part to the direction which connects a 1st guide part and a connection part.

Explanation of symbols

2 Digital camera 5 Lens barrel 30 Upper barrel 32 Lower barrel 38 Shooting optical axis 50 Lens holding frame 52 Third shooting lens 54 Installation surface 56 First guide portion 58 Linking portion 60, 62 Bonding portion 70 First guide pin 72 First elongated hole 74 First leaf spring 76, 78, 82, 86, 88, 100, 102 Opening 80 Second leaf spring 84 Projection 89 Second guide portion 90 Second elongated hole 92 Adjusting portion 94 Second guide pin

Claims (8)

In a lens position adjustment mechanism for adjusting a lens position by moving a lens holding frame installed in a lens barrel on an installation surface perpendicular to a lens optical axis on which the lens holding frame is installed,
A first guide provided on a side of the lens holding frame;
A guide is provided on the first guide portion and the installation surface so that the lens holding frame can be moved on the installation surface in a first direction connecting the first guide portion and the lens optical axis. And first guide means for supporting rotation about the guide position;
An adjustment member provided in a second direction orthogonal to the first direction on the installation surface, and an adjustment member provided at one end portion exposed from a side surface of the lens barrel;
Provided on a second guide portion provided on the other end of the adjustment member and the installation surface so that the adjustment member can be moved in the second direction and rotated around the guide position. Second guide means supported by
A linking portion provided on a side of the lens holding frame at a position facing the first guide portion across the lens optical axis;
A link provided between the adjustment portion of the adjustment member and the second guide portion and the linkage portion, and rotatably links the adjustment member and the lens holding frame on the installation surface. Means and
The lens holding frame is moved in the first direction by the linkage means when the adjustment portion is moved in the first direction and the adjustment member is rotated around the second guide means,
The lens position adjusting mechanism, wherein when the adjusting portion is moved in the second direction and the adjusting member is moved in the second direction, the adjusting portion rotates around the first guide means. .   The first guide means and the second guide means are provided in any one of the components, and are elongated holes formed along the moving direction, and the guide pins provided in the other and inserted into the elongated holes, The lens position adjusting mechanism according to claim 1, comprising:   A first urging means and a second urging means for pressing the first guide portion and the linking portion against the installation surface and holding the lens holding frame at an adjustment position are provided. The lens position adjusting mechanism according to claim 1 or 2.   4. The lens position adjusting mechanism according to claim 3, wherein the adjusting member is formed by a leaf spring and used as the second urging means.   The adjusting portion is exposed from an opening formed so as to penetrate the side surface of the lens barrel, and is moved from the side surface of the lens barrel when moved in the first direction and the second direction. 5. The lens position adjusting mechanism according to claim 1, wherein the lens position adjusting mechanism is not protruded. A lens holding frame for holding the lens;
A lens barrel in which the lens holding frame is incorporated;
An installation surface perpendicular to the lens optical axis provided on the lens barrel and on which the lens holding frame is installed;
In a lens apparatus comprising a lens position adjusting mechanism that moves the lens holding frame on the installation surface to adjust the position of the lens with respect to the lens optical axis
6. A lens apparatus using the lens position adjusting mechanism according to claim 1.   The lens apparatus according to claim 6, wherein after the lens position is adjusted by the lens position adjusting mechanism, the lens holding frame and the lens barrel are bonded by an adhesive. An optical apparatus comprising the lens position adjusting mechanism according to claim 1.

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