JP2008199208A - Imaging section holding unit, lens barrel, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging section holding unit which prevents distortion of a holder even if the holder is thinned, to provide a lens barrel, and to provide an imaging apparatus. <P>SOLUTION: The imaging section holding unit 10 has the holder 40 which is fixed to the lens barrel 3 and attached with the imaging section 9 that is provided with an imaging element 20, and a reinforcement board 31 which is placed between the imaging section 9 and the holder 40, and reinforces the holder 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an imaging unit holding unit, a lens barrel, and an imaging device.

2. Description of the Related Art Conventionally, a lens barrel of a digital camera or the like is provided with a holding base to which an imaging unit including an imaging element such as a CCD (Charge Coupled Devices) is attached (for example, see Patent Document 1).
JP 2007-19813 A

  However, in recent years, there has been an increasing demand for miniaturization and thinning of cameras, and the holding base has been manufactured thinly. Generally, the holding table is manufactured by a molded product made of a synthetic resin. However, if the holding table is manufactured in a thin plate shape due to low rigidity, the holding table may be distorted when the element portion is screwed to the holding table.

  An object of the present invention is to provide an imaging unit holding unit, a lens barrel, and an imaging apparatus that are less likely to be distorted even when the holding table is thinned.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

The invention according to claim 1 is a holding base (40) to which an imaging unit (9) fixed to the lens barrel (3) and provided with an imaging device (20) is attached, an imaging unit (9), An imaging unit holding unit (10) comprising: a reinforcing plate (31) disposed between the holding table (40) and reinforcing the holding table (40).
The invention described in claim 2 is the image pickup unit holding unit (10) according to claim 1, wherein the reinforcing plate (31) is a metal.
The invention according to claim 3 is the imaging unit holding unit (10) according to claim 1 or 2, wherein the holding base (40) has an opening (41) for securing an optical path, The imaging unit holding unit (10) is characterized in that the reinforcing plate (31) is formed so as to surround the entire circumference of the opening (35).
According to a fourth aspect of the present invention, in the imaging unit holding unit (10) according to the third aspect, the reinforcing plate (31) extends from the opening (41) to the outer edge of the holding base (40). It is an imaging part holding unit (10) characterized by being.
According to a fifth aspect of the present invention, in the imaging unit holding unit (10) according to any one of the first to fourth aspects, the reinforcing plate (31) is another member disposed on the holding base (40). It is an imaging part holding | maintenance unit (10) characterized by extending in branch shape so that it may avoid.
According to a sixth aspect of the present invention, in the imaging unit holding unit (10) according to any one of the first to fifth aspects, the reinforcing plate (31) includes the imaging element (20) and a holding base (40). The image pickup unit holding unit (10) is also characterized by having a function as a spacer for adjusting a gap between the image pickup unit and the image pickup unit.
A seventh aspect of the present invention is a lens barrel (3) comprising the imaging unit holding unit (10) according to any one of the first to sixth aspects.
The invention described in claim 8 is an image pickup apparatus (1) comprising the image pickup unit holding unit according to any one of claims 1 to 6.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the imaging unit holding unit, the lens barrel, and the imaging apparatus of the present invention, since the reinforcing plate is provided, the holding table can be thinned without causing distortion of the holding table.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, a digital camera 1 will be described as an example of an imaging apparatus including an imaging element holding unit.

  FIG. 1 is a diagram showing the structure of the digital camera 1. As shown in the figure, the digital camera 1 is an imaging device integrated with a lens barrel, and includes a body 2, a lens barrel 3, an LCD 4 (Liquid Crystal Display), a capacitor 5, a flash memory housing portion 6, a battery housing portion 7, A wiring board 8, an imaging unit 9, and an imaging unit holding unit 10 are provided.

  The body 2 is, for example, a box-shaped container formed by combining a synthetic resin material or a metal material. Further, on the side of the body 2 that faces the subject during normal shooting, a grip 11 that protrudes toward the subject is provided.

  The lens barrel 3 is a part that houses an imaging optical system formed by a plurality of lens groups L. The lens barrel 3 includes a plurality of cylinders 13 arranged substantially coaxially, and the plurality of cylinders 13 can be advanced and retracted in the direction of the optical axis C of the imaging optical system by, for example, a cam mechanism. . The lens barrel 3 is a so-called collapsible lens barrel that can be accommodated in the body 2 by shortening the entire length in the optical axis C direction when the digital camera 1 is powered off. Among the cylinders 13 included in the lens barrel 3, the fixed cylinder 13a arranged on the outermost diameter side is restricted from moving with respect to the body 2, and substantially moves in the direction of the optical axis C during the retracting operation. Is impossible.

  The LCD 4 is a liquid crystal display unit that displays a through image and a captured image. The LCD 4 is provided on the body 2 on the side facing the photographer during normal shooting. A through image is a real-time output of a subject image acquired by an imaging optical system during framing.

  The capacitor 5 is a part that functions as a power source of a light emitting device (not shown), for example, and is accommodated in the body 2.

  The flash memory accommodating portion 6 is a space provided inside the body 2 and is a portion for accommodating a flash memory (not shown). The flash memory is, for example, a card-type non-volatile information recording medium on which shooting data and the like are recorded.

  The battery housing portion 7 is provided inside the body 2 at a portion connected to the above-described flash memory housing portion 6 and in the body 2 where the grip 11 is formed. As the battery of the digital camera 1, for example, a battery such as an AA type dry battery is used. The battery functions as a power source for electric elements (not shown) such as an electric actuator and a CCD 20 provided in the digital camera 1.

  Next, the wiring board 8, the imaging unit 9, and the imaging unit holding unit 10 of the digital camera 1 will be described. FIG. 2 is an enlarged view showing a mounting structure of the wiring board 8, the imaging unit 9, and the imaging unit holding unit 10 in the digital camera 1 shown in FIG. FIG. 3 is an exploded perspective view showing a mounting structure of the wiring board 8, the imaging unit 9, and the imaging unit holding unit 10. 2 and 3 are shown with the photographer side up like FIG.

  The wiring board 8 connects electrical elements provided in the digital camera 1 and is constituted by a single hard board. As shown in FIG. 1, the wiring substrate 8 is disposed to face the back surface of the LCD 4. 2 and 3, the wiring board 8 is provided with two first substrate holes 8a and two second substrate holes 8b.

  The imaging unit 9 includes a CCD 20, an LPF (Low Pass Filter) 21, a dustproof packing 22, and a CCD holding metal plate 23.

  The CCD 20 is a light-electric conversion element that converts subject light acquired by the imaging optical system provided in the lens barrel 3 shown in FIG. 1 into an electrical signal. The CCD 20 includes a plurality of leads 20a provided so as to protrude from a surface opposite to the incident surface, and the leading ends of the leads 20a are connected to the wiring substrate 8 by, for example, soldering. .

  The LPF 21 is provided on the subject side in the optical axis C direction with respect to the imaging surface of the CCD 20. The LPF 21 is for preventing a moire image from being generated in the subject image formed on the CCD 20.

  The dustproof packing 22 is provided between the CCD 20 and the LPF 21 at a position retracted from the optical path. The dust-proof packing 22 is for preventing dust and the like from entering between the CCD 20 and the LPF 21 and is made of a material such as rubber that can be elastically deformed.

  The CCD holding metal plate 23 is a plate material made of a metal material, and is disposed between the CCD 20 and the wiring board 8. The CCD 20 is affixed to a substantially central portion of one surface of the CCD holding metal plate 23. The CCD holding sheet metal 23 is provided with a first sheet metal hole 23a, a second sheet metal screw hole 23b, and a sheet metal boss hole 23c, respectively, across an area where the CCD 20 is attached. The first sheet metal hole 23 a corresponds to the first substrate hole 8 a of the wiring board 8, and the second sheet metal screw hole 23 b corresponds to the second substrate hole 8 b of the wiring board 8.

  The imaging unit holding unit 10 is a part where the imaging unit 9 is mounted and held, and includes a unit main body 30 and a reinforcing plate 31. The imaging unit holding unit 10 is fixed to a fixed cylinder 13a of the lens barrel 3 as shown in FIG.

  FIG. 4 is a view showing only the unit main body 30 with the reinforcing plate 31 removed from the imaging unit holding unit 10. The unit body 30 is a molded product made of synthetic resin, and includes a substantially cylindrical frame 32 and a holding base 40 that covers the imaging unit side of the frame 32 and holds the imaging unit 9.

  Four screw receiving portions 33 (only two are shown in FIGS. 3 and 4) are provided on the side portion of the frame body 32 at equal intervals of about 90 degrees with respect to the optical axis C. Each of the screw receiving portions 33 is provided with a screw hole (not shown), and a frame boss 34 is further provided at a position adjacent to two opposing portions.

  The holding table 40 is provided with a rectangular opening 41 provided on the optical path of the photographing optical system at the center. Also, the holding base screw hole 40a at the position corresponding to the first substrate hole 8a and the first sheet metal hole 23a, the holding base recess 40b, the sheet metal boss at the position corresponding to the second substrate hole 8b and the second sheet metal screw hole 23b. A positioning boss 40c is provided at a position corresponding to the hole 23c. In addition, protrusions 45 are provided at four positions on the outer edge of the holding table 40 at equal intervals of about 90 degrees with respect to the optical axis C, and screws adjacent to two adjacent positions 45a and 45a are provided with screws. A through hole 46 is provided, and a notch 47 for a screw is provided at the other two locations 45b and 45b. Further, the frame boss 34 of the frame body 32 described above is inserted into the pair of projecting portions 45 a and 45 b facing each other with the opening 41 of the holding base 40 interposed therebetween, and the holding base 40 is positioned with respect to the frame body 32. A boss hole 48 is provided.

  When the holding base 40 is placed on the frame body 32, the boss hole 48 of the protrusion 45 of the holding base 40 is inserted into the frame body boss 34 of the frame body 32 so that the holding base 40 is positioned on the frame body 32. Is done. Further, a screw 49 is screwed into a screw hole (not shown) of the screw receiving portion 33 of the frame body 32 from above the through hole 46 of the protruding portion 45 of the holding base 40, and the holding base 40 is fixed to the frame body 32. Is done.

  FIG. 5 is a perspective view of the reinforcing plate 31. The reinforcing plate 31 is a plate material disposed between the CCD holding metal plate 23 and the holding table 40 and is formed of a metal material. As shown in FIG. 2, an opening 35 that is slightly larger than the opening 41 of the holding table 40 is provided at the center of the reinforcing plate 31. As shown in FIG. 3, the reinforcing plate 31 has a branch shape so as to cover a substantial part of the surface area of the holding table 40 without interfering with other members in accordance with the shape on the surface of the holding table 40. To the outer edge of the holding table 40. The reason why the reinforcing plate 31 is extended to the outer edge of the holding table 40 is to secure the area of the reinforcing plate 31 for reinforcing the holding table 40 and to extend the reinforcing plate 31 to the vicinity of the protruding portion 45 of the holding table 40. The reason why the reinforcing plate 31 is extended to the vicinity of the protrusion 45 is low in rigidity because the holding base 40 itself is a synthetic resin plate material. However, since the protrusion 45 is screwed to the frame body 32, distortion is unlikely to occur. This is because the reinforcing effect can be obtained by extending the reinforcing plate 31 to the protruding portion 45.

  Also in the reinforcing plate 31, similarly to the holding table 40, the first reinforcing plate hole 31 a, the second substrate hole 8 b, and the second sheet metal screw are located at positions corresponding to the first substrate hole 8 a and the first sheet metal hole 23 a described above. A second reinforcing plate hole 31b is provided at one of the positions corresponding to the hole 23b, a reinforcing plate notch 31d is provided at the other, and a reinforcing plate boss hole 31c is provided at a position corresponding to the positioning boss 40c.

  Next, the operation of this embodiment will be described. First, the LPF 21 is attached to the CCD 20 via the dustproof packing 22. Then, the CCD 20 is joined to the CCD holding metal plate 23 to assemble the imaging unit 9.

  The CCD holding sheet metal 23 of the image pickup unit 9 and the wiring board 8 are combined, and the second screw S2 is inserted from each of the two second board holes 8b of the wiring board 8 into the second sheet metal screw hole 23b of the CCD holding sheet metal 23. Screw together. As a result, the imaging unit 9 is attached to the wiring board 8, and the lead 20 a of the CCD 20 is soldered to the wiring board 8. The length of the second screw S2 is larger than the combined thickness of the wiring substrate 8, the CCD holding metal plate 23, and the reinforcing plate 31, and the protruding portion is smaller than the depth of the holding base recess 40b.

  On the other hand, the reinforcing plate 31 is disposed in the imaging unit holding unit 10 in which the holding base 40 is attached to the frame body 32. At this time, the reinforcing plate 31 can be positioned on the holding table 40 by passing the reinforcing plate boss hole 31 c of the reinforcing plate 31 through the positioning boss 40 c of the holding table 40. Since the reinforcing plate 31 extends in a branch shape so as not to interfere with other members up to the vicinity of the protruding portion 45 which is a fixing portion between the holding base 40 and the frame body 32, most of the surface of the holding base 40 is formed by the reinforcing plate 31. Can be covered.

  Next, the wiring board 8 to which the imaging unit 9 is attached is placed on the holding table 40 so that the imaging unit 9 is fitted into the opening 35 of the reinforcing plate 31 and the opening 41 of the holding table 40. At this time, the positioning boss 40 c of the holding table 40 penetrating the reinforcing plate boss hole 31 c of the reinforcing plate 31 is inserted into the sheet metal boss hole 23 c of the CCD holding metal plate 23. Thereby, the imaging unit 9 including the CCD holding metal plate 23 and the wiring board 8 fixed to the imaging unit 9 can be positioned on the holding table 40.

  As shown in FIG. 2, the tip of the second screw S <b> 2 protrudes to the opposite side of the wiring board 8 in the CCD holding metal plate 23, but the tip enters the holding table recess 40 b of the holding table 40. As described above, the length of the second screw S2 is longer than the combined thickness of the wiring board 8, the CCD holding metal plate 23 and the reinforcing plate 31, and the protruding portion is shorter than the depth of the holding base recess 40b. Even if the imaging unit 9 to which is fixed is attached to the imaging unit holding unit 10, the second screw S2 does not hit the holding table 40.

  Further, the first screw S1 is inserted and held from the wiring board 8 side with respect to the first board hole 8a, the first sheet metal hole 23a, the first reinforcing plate hole 31a, and the holding base screw hole 40a arranged on a straight line. Screw into the base screw hole 40a. At this time, since the holding table 40 is a synthetic resin plate and has low rigidity, if the reinforcing plate 31 is not present, the holding table 40 is distorted and held when the first screw S1 is screwed. There is a possibility that the table 40 is warped or lifted. However, when the metallic reinforcing plate 31 is arranged as in the present embodiment, the reinforcing plate 31 can suppress the distortion of the holding table 40. Further, since the reinforcing plate 31 extends to the vicinity of the protruding portion 45 of the holding table 40, it is possible to prevent the holding table 40 from warping. Further, since the reinforcing plate 31 is made of metal and has high rigidity, even if it is a thin material compared to the case where a resin member is used, a high distortion preventing effect can be obtained. Further, in order to increase the rigidity of the holding table 40 itself, a sufficient anti-distortion effect cannot be obtained unless the thickness of the holding table 40 is considerably increased. However, when the metal reinforcing plate 31 is used, the holding table 40 is used. Since the substrate itself may be thin, a sufficient distortion prevention effect can be obtained without increasing the overall thickness of the reinforcing plate 31 and the holding base 40 added. Moreover, according to the reinforcement board 31, since the holding stand 40 is reinforced by the surface of the reinforcement board 31, the area to be reinforced increases and a high reinforcement effect can be obtained.

(Deformation)
As described above, various modifications and changes are possible without being limited to the embodiments described above, and these are also within the scope of the present invention.
(1) In this embodiment, the reinforcing plate 31 extends to the vicinity of the protruding portion 45 that is a fixed portion of the holding base 40 to the frame body 32. However, the reinforcing plate 31 is further extended to the protruding portion 45. Can do. By extending to the protrusion part 45, the holding stand 40 can be reinforced more effectively.
(2) Although the CCD 20 is used as the imaging device in the imaging unit holding unit 10 in the present embodiment, the imaging device is not limited to this and may be a CMOS or the like.
(3) The imaging unit holding unit 10 of the embodiment is configured to be fixed to the fixed barrel 13a of the lens barrel 3 in the body 2 of the lens-integrated digital camera 1, but is not limited thereto. For example, it may be provided in a camera body in an interchangeable lens camera system.
(4) In the embodiment, the wiring board 8, the imaging unit 9, and the imaging unit holding unit 10 are fixed with screws. However, the fixing method is not limited to this, and the fixing method may be, for example, rivets or pins. .
(5) In the present embodiment, the case where one kind of CCD 20 is fixed to the imaging unit holding unit has been described. However, the present invention is not limited to this, and when a different type of CCD can be attached, the reinforcing plate 31 is replaced with the CCD. It can also be used as a spacer for adjusting the gap between the holder 40 and the holder 40.

It is a schematic diagram which shows the structure of a digital camera. It is an enlarged view which shows the attachment structure of a wiring board, an imaging part, and an imaging part holding | maintenance unit. It is a disassembled perspective view which shows the attachment structure of a wiring board, an imaging part, and an imaging part holding | maintenance unit. It is the perspective view which showed only the unit main body of the imaging part holding unit. It is a perspective view of a reinforcement board.

Explanation of symbols

  1: camera, 3: lens barrel, 10: imaging unit holding unit, 20: CCD, 31: reinforcing plate, 35: opening, 40: holding table

Claims (8)

A holding base that holds an imaging unit that is fixed to the lens barrel and includes an imaging device;
An imaging unit holding unit, comprising: a reinforcing plate that is disposed between the imaging unit and the holding table and reinforces the holding table. The imaging unit holding unit according to claim 1,
The imaging unit holding unit, wherein the reinforcing plate is a metal. The imaging unit holding unit according to claim 1 or 2,
The imaging unit holding unit, wherein the holding table has an opening for securing an optical path, and the reinforcing plate is formed so as to surround the entire circumference of the opening. The imaging unit holding unit according to claim 3,
The imaging unit holding unit, wherein the reinforcing plate extends from the opening to an outer edge of the holding table. The imaging unit holding unit according to any one of claims 1 to 4,
The imaging unit holding unit, wherein the reinforcing plate extends in a branch shape so as to avoid other members arranged on the holding table. In the imaging unit holding unit according to any one of claims 1 to 5,
The imaging unit holding unit, wherein the reinforcing plate also has a function as a spacer for adjusting a gap between the imaging unit and the holding table.   A lens barrel comprising the imaging unit holding unit according to claim 1.   An imaging apparatus comprising the imaging unit holding unit according to claim 1.