JP2010026007A - Lens barrel device and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the overall thickness by reducing an interval between a lens and a prism. <P>SOLUTION: The lens barrel device includes: the alignment lens 11a on which imaging light is made incident; the prism 11b which bends the optical path of the imaging light by 90°; a light shield diaphragm member 23 disposed between the alignment lens 11a and the prism 11b; and a lens barrel member 21 to which the prism 11b is fixed and also the alignment lens 11a is attached to the imaging light incident side of the prism 11b while interposing the light shield diaphragm member 23 in-between. The alignment lens 11a is directly placed and fixed in a shifted and aligned state onto the light shield diaphragm member 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel device in which a light-shielding diaphragm member is provided between a lens on which imaging light is incident and a prism that bends an optical path by 90 °, and an imaging device including the lens barrel device.

  In order to reduce the thickness of the digital still camera, a lens barrel device is used in which a prism is disposed next to the first group lens and the optical path is bent by 90 °. In this bending lens barrel apparatus, a lens (hereinafter also referred to as an alignment lens) on which the first imaging light in one group is incident is shifted in alignment, that is, in the direction orthogonal to the optical axis of the alignment lens. A core is provided to obtain desired optical characteristics. At this time, a light blocking aperture member is disposed between the alignment lens and the prism in order to prevent the influence of ghosts caused by the incidence of unnecessary light rays and flare caused by reflection inside the lens barrel.

  The material of the light blocking aperture member is an extremely thin metal plate coated with a light blocking coating or a black resin sheet having a high light blocking property. As shown in FIGS. 12 and 13, the light blocking diaphragm member 101 is dropped between the prism 103 and the alignment lens 104 with reference to the outer shape of the light blocking diaphragm member 101 when installed in the lens barrel member 102. It is disposed in the mounting recess 105. Further, on the mounting surface of the lens barrel member 102 where the mounting recess 105 is provided, the light blocking diaphragm member 101 is disposed on the prism 103, and further, the alignment lens 104 is disposed on the light blocking diaphragm member 101. A lens receiving portion 106 that receives the alignment lens 104 is formed. The lens receiving portion 106 is formed so as to be one step higher than the mounting recess 105 on which the light blocking diaphragm member 101 is placed, and the light blocking diaphragm member 101 has an outer shape so as to escape the lens receiving portion 106. It is directly placed in the mounting recess 105.

  Accordingly, the mounting recess 105 is sufficiently deeper than the thickness of the light blocking aperture member 101 so that the light blocking aperture member 101 does not run on the lens receiving portion 106 when the light blocking aperture member 101 is mounted on the mounting recess 105. It is necessary to form it at a depth that is twice or more the thickness of the light blocking diaphragm member 101. As a result, the distance between the prism 103 and the alignment lens 104 is widened, which hinders the thinning of the lens barrel device.

  Further, it is necessary to accurately position and fix the light blocking diaphragm 101 with respect to the alignment lens 104 and the prism 103.

  The alignment lens 104 is fixed to the barrel member 102 by the front frame 107.

  The present invention has been made in view of the above problems, and in a folding lens barrel, a light blocking diaphragm member is provided between a lens on which imaging light is incident and a prism that bends the optical path by 90 °. In providing the lens barrel device, it is an object of the present invention to provide a lens barrel device that can reduce the distance between the lens and the prism and reduce the overall thickness of the lens barrel and an imaging device including the lens barrel device.

Japanese Patent Laid-Open No. 10-10410

  The lens barrel device according to the present invention includes a lens into which imaging light is incident, a prism that bends the optical path of the imaging light, a light-shielding diaphragm member that is disposed between the lens and the prism, and the prism. And a lens barrel member on which the lens is mounted with the light-shielding diaphragm member interposed on the imaging light incident surface side of the prism. The lens is directly placed and fixed on the light blocking aperture member in an aligned state.

  Further, an imaging apparatus according to the present invention includes a lens on which imaging light is incident, a prism that bends the optical path of the imaging light by 90 °, a light-shielding diaphragm member that is disposed between the lens and the prism, The prism is fixed, and a lens barrel member to which the lens is attached by interposing the light blocking diaphragm member on the imaging light incident surface side of the prism, and imaging light whose optical path is bent by the prism are detected. And an image sensor. The lens is directly placed and fixed on the light blocking aperture member in an aligned state.

  According to the present invention, since the lens is directly placed and fixed on the light-shielding diaphragm member in an aligned state, the distance between the lens and the prism can be narrowed to reduce the overall thickness.

  Hereinafter, a digital still camera 1 to which the present invention is applied will be described with reference to the drawings. Hereinafter, the digital still camera 1 is simply referred to as a camera 1.

(1) Appearance Configuration of Digital Still Camera As shown in FIGS. 1 to 3, a camera 1 to which the present invention is applied uses a semiconductor recording medium as an information recording medium, and picks up an optical image from a subject as an imaging device. It is converted into an electrical signal by a CCD (Charge-Coupled Device), CMOS (Complementary Metal-Oxide Semiconductor), etc., and can be recorded on a semiconductor recording medium or displayed on a display device such as a liquid crystal display.

  The camera 1 has a flat camera body 2 that is horizontally long. On the front surface of the camera body 2, a lens portion 3 is provided at the upper corner portion. The lens unit 3 is opened and closed by a lens cover 4 attached to the front surface of the camera body 2 so as to be slidable in the vertical direction, and the lens unit 3 is exposed to the outside when the lens cover 4 is lowered at the time of photographing. It is like that. Further, in the vicinity of the lens unit 3, a flash 5 that is opened and closed by the lens cover 4 is provided together with the lens unit 3.

  On the back surface of the camera body 2, a display unit 6 made of an LCD, an organic EL display or the like is provided. The display unit 6 displays a subject captured by the image sensor and also displays captured image data and the like.

  Various operation switches are provided on the back of the camera body 2. As operation switches, a mode selection knob 7a for selecting a function mode (still image, moving image, reproduction, etc.), a zoom button 7b for performing a zoom operation, a screen display button 7c for displaying a screen, and a menu button 7d for selecting various menus. There are arranged a direction key 7e for moving a cursor for selecting a menu, a screen button 7f for switching a screen size and deleting an image.

  Further, on the upper surface of the camera body 2, a power button 7g for turning on / off the power, a recording button 7h for performing recording, that is, starting and stopping of photographing, and image blur correction by operating image blur correction when camera shake occurs. Is provided with a camera shake setting button 7i and the like.

  The camera body 2 includes components such as a lens barrel, a battery, a microphone, and a speaker.

(2) Configuration of Lens Barrel As shown in FIG. 4, the lens barrel device 10 of the camera 1 holds a plurality of lenses. The lens system held by the lens barrel device 10 is a bent lens system including five lens groups 11 to 15 in which five lens groups are arranged on the same optical axis L, and among the five lens groups 11 to 15. The first group lens 11 located on the front end side is opposed to the subject of the first lens 11a that is opposed to the subject and serves as a condensing lens to which imaging light is incident, and the first lens 11a that serves as the condensing lens. The prism 11b is arranged on the side, and the second lens 11c is opposed to the prism 11b. The prism 11b is formed of a triangular prism whose cross-sectional shape is a right-angled isosceles triangle. The first lens 11a serving as an objective lens is opposed to one of two surfaces adjacent to a position displaced by 90 degrees and the other surface is opposed to the other surface. The second lens 11c is opposed. The first lens 11a collects imaging light and emits it to the prism 11b, and is thus fixed to the barrel member after alignment.

  In this bent lens system, the optical axis L is bent at approximately 90 degrees by the prism 11b. As a result, the first optical axis L1 is set on the first lens 11a side that is the objective lens, and the imaging element 18 (image forming direction) is in a direction orthogonal to the first optical axis L1 (direction intersected by 90 degrees). ) Side is set with the second optical axis L2.

  In the first group lens 11, the first lens 11a, which is an objective lens, passes through the first lens 11a and enters the prism 11b. The first group lens 11 is reflected by a reflecting surface inclined at 45 degrees with respect to the first optical axis L1, and the traveling direction is 90 degrees. The light is bent and emitted, passes through the second lens 11c, and travels toward the second lens group 12 along the second optical axis L2. The second group lens 12 includes a combination of a third lens 12a and a fourth lens 12b, and moves in the tele and wide directions on the second optical axis L2. The light transmitted through the second group lens 12 is incident on the third group lens 13.

  The third group lens 13 includes a fifth lens fixed to the lens barrel device 10. A fourth group lens 14 including a sixth lens is disposed behind the third group lens 13. Between the fourth group lens 14 and the third group lens 13, a diaphragm mechanism 16 capable of adjusting the amount of light passing through the lens system is disposed. The fourth group lens 14 is configured to be movable on the second optical axis L2. A fifth group lens 15 including a seventh lens 15 a and a correction lens 17 described later is disposed behind the fourth group lens 14. Of the fifth group lens 15, the seventh lens 15a is fixed to the lens barrel, and the correction lens 17 is movably disposed behind the seventh lens 15a. Further, the seventh lens 15a is imaged behind the correction lens 17. Element 18 is arranged.

  The second group lens 12 and the fourth group lens 14 move independently and independently in the tele and wide directions along the second optical axis L2. The second group lens 12 and the fourth group lens 14 perform zoom adjustment and focus adjustment by moving in the tele or wide direction. That is, during zooming, zoom adjustment is performed by moving the second group lens 12 and the fourth group lens 14 from wide (wide angle) to tele (telephoto). Further, at the time of focusing, focus adjustment is executed by moving the fourth group lens 14 from wide (wide angle) to tele (telephoto).

  The image sensor 18 is fixed to an image sensor adapter, and is attached to the lens barrel via the image sensor adapter. An optical filter 19 is disposed on the front side of the image sensor 18, and an image blur correction mechanism having a correction lens 17 is disposed between the optical filter 19 and the seventh lens 15 a. The image blur correction mechanism, which will be described in detail later, corrects the blur of the captured image (image) due to the vibration of the lens system. The correction lens 17 is attached so that its optical axis coincides with the second optical axis L2 in a normal state. When image blur occurs on the imaging surface of the image sensor 18 due to vibration of the camera body 2 or the like, the image blur correction mechanism 20 moves the correction lens 17 in two directions orthogonal to the second optical axis L2 (first The image is moved in the direction X (pitch direction) and the second direction Y (yaw direction) to correct image blur on the imaging plane.

(3) First Lens Mounting Structure The first lens group 11 to the correction lens 17 are arranged in the lens barrel device 10 as shown in FIGS. A first lens 11a (hereinafter also referred to as an alignment lens 11a) that serves as a condensing lens on which imaging light is incident is a part of the lens barrel of the lens barrel device 10 as shown in FIG. The lens barrel member 21 is attached by a front frame 22 that is a part of the outer casing of the camera body 2. Further, a light blocking diaphragm member 23 is disposed between the alignment lens 11a and the prism 11b in order to prevent the influence of ghosts caused by the incidence of unnecessary light rays and flare caused by reflection inside the lens barrel.

  Specifically, as shown in FIGS. 6 and 7, the prism member 11 is fixed to the lens barrel member 21, and a mounting portion 24 is provided on the front surface portion to which the alignment lens 11 a is attached. The attachment portion 24 is configured by a substantially rectangular recess having a rising wall around it. The surrounding rising wall 24a constituting the mounting portion 24 functions as a regulating wall that regulates the amount of movement in the direction orthogonal to the optical axis of the alignment lens 11a, that is, the amount of movement for alignment. In addition, a substantially rectangular opening 25 is formed on the bottom surface of the mounting portion 24 to guide the imaging light incident on the alignment lens 11a to the prism 11b. The periphery of the opening 25 is a flat mounting surface 26 on which the light blocking diaphragm member 23 is mounted.

  Here, the light blocking diaphragm member 23 is formed with a diaphragm opening 27 that is slightly smaller than the substantially rectangular opening 25 of the prism 11b exposed, and positioning pieces 28 and 29 are formed on one diagonal line. ing. One positioning piece 28 is formed with a perfect circular positioning hole 28a, and the other positioning piece 29 is formed with a long positioning hole 29a. Note that the number of positioning pieces is not limited to this, and may be three or more.

  The light-shielding diaphragm member 23 is a black resin sheet having a high light-shielding property, and its surface is matte-coated or blasted, and the alignment lens 11a placed thereon is easy to slide. It has become.

  As shown in FIGS. 7 and 8, the mounting portion 24 has a positioning portion 31 on which the positioning pieces 28 and 29 of the light blocking aperture member 23 are extended so as to protrude outward from the region in the rising wall 24a. , 32 are formed at positions facing each other across the lens center of the alignment lens 11a. One positioning piece 28 extends in one positioning portion 31, and the other positioning piece 29 extends in the other positioning portion 32. Boss 31a, 32a which engages with positioning hole 28a, 29a formed in positioning piece 28, 29 is formed in each positioning part 31, 32. That is, the position where the light blocking diaphragm member 23 is positioned is outside the slidable region of the alignment lens 11a, that is, the region within the rising wall 24a.

  The light-shielding diaphragm member 23 engages the positioning hole 28a of one positioning piece 28 with the boss 31a of the positioning portion 31 on the bottom surface of the mounting portion 24, and the positioning hole of the other positioning piece 29 with the boss 32a of the positioning portion 32. By engaging 29a, it is positioned and attached with high accuracy. In other words, the light blocking diaphragm member 23 is attached so that the centers of the diaphragm opening 27 and the opening 25 coincide with each other, cover the periphery of the opening 25, and reduce the opening of the opening 25.

  Also, as shown in FIGS. 8 and 9, the attachment portion 24 protrudes outside the region in the rising wall 24a, that is, outside the slidable region of the alignment lens 11a. One or a plurality of adhesive reservoirs 33 that are filled with an adhesive for fixing to the attachment portion 24 are formed. The reservoir 33 is formed so as to be continuous with the rising wall 24a. When the adhesive is filled, the adhesive fixes the alignment lens 11a and the light blocking diaphragm 23 to the attachment 24 at the same time.

  The adhesive used here is preferably an ultraviolet curable adhesive, but is not particularly limited.

  Further, on the bottom surface of the mounting portion 24, as shown in FIG. 7, support portions 34 and 35 for supporting the alignment lens 11 a placed on the light-shielding diaphragm member 23 positioned in the mounting portion 24. Is formed. The support portions 34 and 35 are formed so as to be continuous inside the rising wall 24 a and are formed so as to be one step higher than the bottom surface of the mounting portion 24. Each of the support portions 34 and 35 is provided with three or more. The support portion 34 serves as a reference surface for the mounting height of the alignment lens 11a. In principle, the alignment lens 11a is supported by the support portion 34 in the attachment portion 24. The support part 35 is a spare for the support part 34. For example, when the alignment lens 11a has a manufacturing error, the support part 35 supports the alignment lens 11a. For example, the support part 35 is formed slightly lower than the support part 34.

  Next, an assembly method will be described. First, as shown in FIGS. 8 and 10, the light blocking diaphragm member 23 is provided on the bottom surface of the mounting portion 24 on the mounting portion 24 of the barrel member 21 to which the prism 11 b and the like are assembled. The positioning hole 28a of one positioning piece 28 is engaged with the boss 32a of the positioning portion 32, and the positioning hole 29a of the other positioning piece 29 is engaged with the positioning hole 28a. Next, the alignment lens 11a is placed directly on the mounting portion 24 in the rising wall 24a. That is, the alignment lens 11a is supported by the support portion 34 and / or the support portion 35 with the light blocking aperture member 23 interposed therebetween. Here, as described above, the centering lens 11a is easily slid on the surface of the light-shielding diaphragm member 23, and the centering lens 11a slides on the light-shielding diaphragm member 23 to form a prism. The position with 11b is adjusted. When the alignment is completed, the alignment lens 11a is cured by filling the reservoir 33 with an adhesive and irradiating the adhesive with ultraviolet rays or the like while the position is maintained. When the adhesive is cured, the alignment lens 11 a is fixed to the attachment portion 24 together with the light blocking aperture member 23.

  Thereafter, as shown in FIGS. 10 and 11, a substantially ring-shaped front frame 22 is thermally welded to the mounting portion 24 of the lens barrel member 21 so as to hold the periphery of the fixed alignment lens 11a. Fixed by.

  In the mounting structure of the alignment lens 11a as described above, as shown in FIG. 10, the alignment lens 11a is directly placed on the light-shielding diaphragm member 23 and fixed with an adhesive after alignment in the mounting portion 24. As a result, the distance between the alignment lens 11a and the prism 11b can be made shorter than before, which contributes to the overall thinning of the camera body 2. In addition, since the light blocking aperture member 23 is positioned on the bosses 31a and 32a of the positioning portions 31 and 32 of the mounting portion 24, the alignment lens 11a is repaired and fixed to the light blocking aperture member 23. The aperture member 23 and the alignment lens 11a can be accurately aligned, and the performance of the lens barrel device 10 can be improved.

It is the perspective view which looked at the digital still camera to which this invention was applied from the front, and shows the state where the lens cover was closed. It is the perspective view which looked at the digital still camera to which this invention was applied from the front, and shows the state where the lens cover was opened. 1 is a rear view of a digital still camera to which the present invention is applied. It is a side view which shows the lens system incorporated in a lens-barrel apparatus. It is an external appearance perspective view of a lens-barrel apparatus. It is an exploded view of a lens-barrel apparatus. It is a front view of a lens barrel member. It is a front view which shows the state which mounted the aperture_diaphragm | restriction member for light shielding in the attaching part of the lens-barrel member. It is a front view which shows the state which mounted the centering lens in the attaching part of a lens-barrel member. It is sectional drawing of the centering lens part of a lens-barrel apparatus. It is a front view which shows the state which mounted the centering lens on the attaching part of the lens-barrel member, and attached the front frame on it. It is a front view which shows the state which mounted the diaphragm member for light shielding on the conventional lens-barrel member. It is sectional drawing of the centering lens part of the conventional lens barrel apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens barrel apparatus, 11 1st group lens, 11a 1st lens (alignment lens), 11b Prism, 11c 2nd lens, 12 2nd group lens, 12a 3rd lens, 12b 4th lens, 13 3 Group lens, 144 group lens, 15 group 5 lens, 15a seventh lens, 16 aperture mechanism, 17 correction lens, 18 image sensor, 19 optical filter, 21 lens barrel member, 22 front frame, 23 light blocking aperture member, 24 mounting portion, 24a rising wall, 25 opening portion, 26 mounting surface, 27 aperture opening portion, 28 positioning piece, 28a round positioning hole, 29 positioning piece, 29a long hole positioning hole, 31 positioning portion, 31a Boss, 32 Positioning part, 32a Boss, 33 Reservoir part, 34, 35 Support part

Claims (6)

A lens on which imaging light is incident;
A prism that bends the optical path of the imaging light;
A light-shielding diaphragm member disposed between the lens and the prism;
A lens barrel member to which the prism is fixed and to which the lens is attached by interposing the light-shielding diaphragm member on the incident surface side of the imaging light of the prism;
A lens barrel device in which the lens is placed and fixed directly on the light-shielding diaphragm member in an aligned state. The lens barrel device according to claim 1, wherein the light blocking aperture member is a sheet body whose surface is matte-coated or blasted. The light blocking diaphragm member is attached by engaging a positioning hole formed in the light blocking diaphragm member with a boss formed in the mounting portion of the lens barrel member,
The lens barrel device according to claim 1, wherein the lens is slidable with respect to the light blocking diaphragm member before being fixed. The lens barrel device according to claim 3, wherein the boss is formed at a position facing the lens center outside the sliding range when the lens is aligned. The lens barrel device according to claim 4, wherein an adhesive reservoir for fixing the lens is formed outside the sliding range when the lens is aligned at the mounting portion. A lens on which imaging light is incident;
A prism that bends the optical path of the imaging light;
A light-shielding diaphragm member disposed between the lens and the prism;
A lens barrel member on which the prism is fixed and the lens is attached by interposing the light blocking diaphragm member on the incident surface side of the imaging light of the prism;
An imaging device for detecting imaging light whose optical path is bent by the prism;
An imaging apparatus in which the lens is directly placed and fixed on the light-shielding diaphragm member in an aligned state.

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