JP5151960B2 - Imaging element mounting member and imaging apparatus - Google Patents

Description

The present invention relates to an imaging element mounting member and an imaging apparatus.

In a digital camera, an optical filter such as a low-pass filter is disposed in front of an image sensor to reduce moiré, false color, and the like, and an image is optically corrected. On the other hand, in order to reduce the size of a digital camera, there is one in which an image pickup device, a lens barrel, a lens, an optical filter, and the like are unitized (for example, see Patent Document 1). In Patent Document 1, the optical filter (4) is fixed to the lens barrel in a state where the optical filter (4) is fitted in the opening on the rear side of the lens barrel (2), and the rubber (5) and the imaging element (6) are arranged on the rear side of the lens barrel. The image sensor is fixed to the lens barrel with the rubber inserted into the opening and pressed against the optical filter by the image sensor.
Japanese Patent Laid-Open No. 9-130652

  By the way, in order to reduce the size and thickness of a digital camera, if the lens barrel is reduced in size, it is necessary to reduce the size of the image sensor. However, when a general-purpose image sensor is used to suppress the procurement cost of the image sensor, there arises a situation where the image sensor cannot be miniaturized in accordance with the miniaturization of the lens barrel. Therefore, unlike the technique described in Patent Document 1, the image sensor cannot be inserted into the rear opening of the lens barrel. Therefore, as shown in FIG. 9, the image sensor 120 is not inserted into the opening 105 of the lens barrel 104, while the rubber 140 is fitted into the opening 105 of the lens barrel 104, and the rubber 140 is pressed against the optical filter 117 by the image sensor. Will be. Then, the image sensor 120 is attached to the end surface of the lens barrel 104, and the peripheral portion 121 of the image sensor 120 is protruded from the lens barrel 104.

  However, since the peripheral portion 121 of the image sensor 120 is in a state of coming out of the lens barrel 104, light enters the peripheral portion 121. For this reason, in the signal processing of the image acquired by the image sensor 120, the light incident on the peripheral portion 121 has an adverse effect.

  Therefore, a problem to be solved by the present invention is to make it possible to shield the peripheral edge of the image sensor even when the peripheral edge of the image sensor is out of the lens barrel.

In order to solve the above problems, in the invention according to claim 1, the light receiving surface of the imaging element is covered except for the central portion by a light-shielding covering portion in which an opening is formed in the central portion, and the frame portion. Is provided so as to surround the opening of the covering portion and to protrude from the covering portion in a direction opposite to the imaging element, and the light receiving surface of the imaging element faces the opening of the lens barrel, and the opening of the lens barrel An optical filter is fitted, the frame part is fitted into an opening of the lens barrel and is in contact with the optical filter, and the frame part is closed by the optical filter.

According to a second aspect of the present invention, in the mounting member for an image pickup device according to the first aspect, the second frame portion is provided so as to protrude from the covering portion toward the image pickup device side, and the image pickup device is the second image pickup device. It is fitted to the frame part and is surrounded by the second frame part.

According to a third aspect of the present invention, in the imaging element mounting member according to the first or second aspect, the covering portion and the frame portion are integrally formed.

According to a fourth aspect of the present invention, in the imaging element mounting member according to the first or second aspect, the covering portion and the frame portion are formed separately.

According to a fifth aspect of the present invention, there is provided a housing, a lens barrel housed in the housing, an imaging element having a light receiving surface facing an opening of the lens barrel, and the lens barrel attached to the lens barrel. An optical system that forms an image on the light receiving surface of the image pickup device through the opening of the image pickup device, and a light shielding property that covers the light receiving surface of the image pickup device except for the central portion of the light receiving surface of the image pickup device. A cover portion, an optical filter fitted in the opening of the lens barrel, and an opening that surrounds the opening portion of the cover portion and protrudes from the cover portion in a direction opposite to the imaging element. And a frame portion that is fitted into the opening of the lens and contacts the optical filter and is closed by the optical filter.

  According to the present invention, since the periphery of the central portion of the light receiving surface of the image sensor is covered with the covering portion, the region around the central portion of the light receiving surface has come out of the lens barrel due to downsizing of the lens barrel Even so, the area is shielded from light. Therefore, there is no adverse effect on the image acquired by the image sensor. Further, even if the lens barrel is downsized, an image sensor that is larger than the opening of the lens barrel, for example, a general-purpose image sensor can be used.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

<First Embodiment>
FIG. 1 is a perspective view showing a digital camera 1 as an embodiment of an imaging apparatus to which the present invention is applied. FIG. 2 is a perspective view showing a lens barrel 4, an imaging device 20, and an optical filter 17 built in the digital camera 1. 3 is a perspective cross-sectional view showing the lens barrel 4, the image pickup device 20, the optical filter 17, the light shielding cover 40, and the like. 4 is a perspective cross-sectional view of a state cut along a vertical cross section perpendicular to the cross section of FIG. FIG. 5 is a perspective view showing the lens barrel 4 and the like.

  In this digital camera 1, a shutter button 3 is provided on the upper surface of a housing 2, and a barrel 4, an image sensor 20, a circuit board 21, and the like are accommodated in the housing 2, and the bending optical system 10 is placed in the barrel 4. And the image pick-up element 20 is attached. Although not shown, on the back side of the housing 2, a monitor constituted by a liquid crystal display panel and various switches such as a mode switch and a zoom switch are provided.

  The lens barrel 4 is arranged from the upper part of the front surface 2 a of the housing 2 through the inside of the housing 2 to the lower side of the housing 2. The lens barrel 4 includes a lens barrel body 5, an objective lens holder 6, a prism holder 7, a movable lens holder 8, and the like. The lens barrel main body 5 extends in the vertical direction so as to surround the front, rear, left and right of the optical path formed by the bending optical system 10. The lower end of the lens barrel main body 5 is opened, and the size of the lower opening 5 a is smaller than the size of the image sensor 20. In particular, since the front-rear length of the image sensor 20 is larger than the front-rear length of the lower opening 5a of the lens barrel main body 5, the front portion of the image sensor 20 protrudes ahead of the front surface 5b of the lens barrel main body 5. A rear portion of the image sensor 20 protrudes behind the rear surface 5 c of the lens barrel main body 5. A prism holder 7 is provided at the upper end of the lens barrel body 5, and an objective lens holder 6 is provided at the front of the prism holder 7. An opening 6 a of the objective lens holder 6 is opened on the front side of the housing 2. A plurality of lens holders are provided inside the lens barrel main body 5, and the movable lens holder 8 is attached to the upper and lower intermediate portions of the lens barrel main body 5.

  The bending optical system 10 bends the optical axis of the subject light taken from the opening 6 a of the objective lens holder 6 and forms an image of the subject on the image of the image sensor 20 through the lower opening 5 a of the lens barrel body 5. .

  Specifically, the bending optical system 10 includes an objective lens 11, a prism 12, a lens 16, a focal length adjustment lens (zoom lens) or a focal length adjustment lens group, a focusing lens, or a focusing lens group. The objective lens 11 is held by the objective lens holder 6 so as to close the opening 6 a of the objective lens holder 6. The objective lens 11 captures subject light, and the optical axis of the objective lens 11 is in the horizontal direction, particularly in the front-rear direction of the camera.

  The prism 12 is disposed at a close position behind the objective lens 11 and is held by the prism holder 7. The prism 12 is provided in the shape of a right triangular prism. The incident surface 13 and the exit surface 15 are orthogonal to each other, and the reflection surface 14 intersects the entrance surface 13 and the exit surface 15 at an acute angle. The incident surface 13 is close to the objective lens 11 and is perpendicular to the optical axis of the objective lens 11. The prism 12 bends the optical axis of the subject light captured by the objective lens 11 at 90 degrees on the reflecting surface.

  The lens 16 is disposed at a close position below the emission surface 15 of the prism 12 and is held on the upper portion of the lens barrel body 5. The optical axis of the lens 16 is along the vertical direction and is perpendicular to the emission surface 15 of the prism 12. The optical axis of the lens 16 is orthogonal to the optical axis of the objective lens 11 on the reflecting surface 14 of the prism 12.

  The focal length adjustment lens (zoom lens) or the focal length adjustment lens group is held by the movable lens holder 8, and the focal length is adjusted by its vertical movement. The focusing lens or the focusing lens group is held by a movable lens holder (not shown) arranged on the lower side of the lens holder 8 (the lower end side of the lens barrel main body 5), and is focused by its vertical movement.

  An optical filter 17 is attached to the lower part of the lens barrel body 5. The optical filter 17 is a low-pass filter, but may be another band-pass filter. In addition, the image sensor 20 is attached to the lower end of the lens barrel body 5. Hereinafter, the mounting structure of the image sensor 20 and the optical filter 17 will be specifically described.

  An optical filter 17 is fitted in the lower opening 5 a of the lens barrel body 5. A presser 5 d is provided on the optical filter 17 and on the inner surface of the lens barrel body 5. The optical filter 17 is pressed against the presser 5d.

  The image sensor 20 is mounted on the circuit board 21. The circuit board 21 is a resin board, a glass board, a ceramic board, or other rigid board. The circuit board 21 may be a flexible flexible board.

  The imaging element 20 is surrounded by a metal bracket 22. The bracket 22 is a member for attaching the circuit board 21 on which the image pickup device 20 is mounted to the lower end portion of the lens barrel main body 5, and is a frame-like metal having an opening into which the image pickup device 20 can be inserted at the center. The front piece portion 23 and the rear piece portion 24 of the plate are bent substantially perpendicularly to the left piece portion 25 and the right piece portion 26. The front piece portion 23 and the rear piece portion 24 of the bracket 22 are along the front edge and the rear edge of the image sensor 20, respectively, and the front piece portion 23 and the rear piece portion 24 are opposed to each other with the image sensor 20 interposed therebetween. Further, the left piece 25 and the right piece 26 of the bracket 22 are along the left edge and the right edge of the image sensor 20, respectively, and the left piece 25 and the right piece 26 are opposed to each other with the image sensor 20 interposed therebetween. .

  With the left piece 25 and the right piece 26 of the bracket 22 facing the circuit board 21, the left piece 25 and the right piece 26 are fixed to the circuit board 21 with an adhesive or the like.

  In a state where the bracket 22 is fixed to the circuit board 21, the front piece 23 is bent along the front edge of the circuit board 21 with respect to the left piece 25 and the right piece 26, and the rear piece 24 is It is bent with respect to the left piece 25 and the right piece 26 along the rear edge of the circuit board 21. Therefore, the front piece part 23 and the rear piece part 24 are in a state of standing with respect to the circuit board 21.

A shading cover 40 made of rubber or soft resin is attached to the image sensor 20. The light shielding cover 40 has a covering portion 42, an outer frame portion 43, and an inner frame portion 44, which are integrally formed.
The covering portion 42 is provided in a rectangular frame shape and a thin plate shape, and a rectangular opening 41 is formed in the central portion of the covering portion 42.
The outer frame portion 43 surrounds the outer edge of the covering portion 42. The outer frame portion 43 is connected to the outer edge of the one surface 42a of the covering portion 42 and is provided in a state of protruding from the surface 42a.
The inner frame portion 44 surrounds the opening portion 41 of the covering portion 42. The inner frame portion 44 is connected to the outer edge of the other surface 42b of the covering portion 42 and is provided in a state protruding from the surface 42b.

  The image pickup device 20 is fitted to the outer frame portion 43 in a state where the light receiving surface 20 a of the image pickup device 20 faces the one surface 42 a of the covering portion 42. Therefore, the light receiving surface 20a of the image sensor 20 is covered with the covering portion 42 except for the central portion thereof. Further, the image pickup device 20 is surrounded by the outer frame portion 43, and the four side surfaces of the image pickup device 20 are covered by the outer frame portion 43.

  The inner frame portion 44 is fitted into the lower opening 5 a of the lens barrel main body 5 and is in close contact with the inner surface of the lens barrel main body 5. The optical filter 17 is sandwiched between the inner frame portion 44 and the presser 5d. The inner frame portion 44 is closed by the optical filter 17.

  The bracket 22 is coupled to the lower portion of the lens barrel main body 5 with the imaging element 20 facing the lower opening 5 a of the lens barrel main body 5. Here, a through hole 28 is formed in the right piece portion 26 of the bracket 22, and a screw 32 is inserted into the through hole 28 and fastened to the lower end portion of the lens barrel main body portion 5. Similarly, a screw 31 is inserted into a through hole 27 formed in the left piece portion 25, and the screw 31 is fastened to the lower end portion of the lens barrel main body portion 5.

The assembly method will be described.
The image sensor 20 is mounted on the circuit board 21.
Next, the left piece 25 and the right piece 26 of the bracket 22 are opposed to the circuit board 21, and the imaging element 20 is moved by the front piece 23, the rear piece 24, the left piece 25 and the right piece 26 of the bracket 22. Enclose.
Next, the image sensor 20 and the circuit board 21 are fixed to the bracket 22 with an adhesive.
Next, the image pickup device 20 is fitted into the outer frame portion 43 of the light shielding cover 40, and the light receiving surface 20a is covered with the covering portion 42 except for the central portion of the light receiving surface 20a of the image pickup device 20.
Thus, an image sensor unit is manufactured.

  On the other hand, the optical filter 17 is fitted into the lower opening 5a of the lens barrel body 5 of the lens barrel 4 to which the bending optical system 10 is assembled, and the optical filter 17 is brought into contact with the presser 5d. Next, the light receiving surface 20 a of the imaging element 20 is directed to the lower opening 5 a of the lens barrel main body 5, and the inner frame portion 44 of the light shielding cover 40 is fitted into the lower opening 5 a of the lens barrel main body 5. Then, the optical filter 17 is pushed toward the presser 5 d by the inner frame part 44, and the optical filter 17 is sandwiched between the presser 5 d and the inner frame part 44. Next, the screws 31 and 32 are passed through the through holes 27 and 28 of the bracket 22, and the screws 31 are tightened to the lower part of the lens barrel body 5.

  Next, the lens barrel 4 is housed in the housing 2 together with the image pickup device 20 and the bending optical system 10, and these are fixed.

  Before attaching the light shielding cover 40 to the image sensor 20, the inner frame portion 44 of the light shielding cover 40 is fitted into the lower opening 5a of the lens barrel main body 5, and then the image sensor 20 is attached to the light shielding cover 40. The bracket 22 may be fixed to the lower portion of the lens barrel main body 5 with screws 31 and 32.

  In the digital camera 1 configured as described above, an area within the opening 41 of the covering portion 42 in the light receiving surface 20a of the image sensor 20 is an effective pixel area. The image of the area where the covering portion 42 overlaps is trimmed by image processing, and the image in the effective pixel area is used.

  As described above, according to the present embodiment, the peripheral area of the effective pixel area of the image sensor 20 is shielded from light by the covering portion 42, so that an image acquired by the image sensor 20 is not adversely affected. That is, since the image of the peripheral region of the effective pixel region is black, the image of the peripheral region of the effective pixel region affects the image of the peripheral effective pixel region when the image acquired by the image sensor 20 is signal-processed. No.

  In addition, the image pickup device 20 having a size larger than the size of the lower opening 5a of the lens barrel main body 5 can be used. In other words, even if a large-sized image sensor 20 is used, it is not necessary to increase the size of the lower opening 5a of the lens barrel body 5 in order to shield the entire light receiving surface 20a of the image sensor 20, and thus the lens barrel 4 is enlarged. There is no need to convert it. In particular, even if there is no image pickup device having a size suitable for the size of the lower opening 5a of the lens barrel main body 5 designed to be thin or small, it is not necessary to change the design of the size of the lens barrel 4. Therefore, general-purpose image sensors of various sizes can be used for the image sensor 20.

  In addition, since the image sensor 20 is covered with the light shielding cover 40 and the inner frame portion 44 of the light shielding cover 40 is blocked with the optical filter 17, dust or the like does not adhere to the light receiving surface 20 a of the image sensor 20. Therefore, the reflection of dust or the like can be prevented. In particular, the side surface of the image pickup device 20 is also surrounded by the outer frame portion 43 of the light shielding cover 40, and the image pickup device 20 is fitted into the outer frame portion 43, so that intrusion of dust and the like can be reliably suppressed.

  Further, since the front piece portion 23 of the bracket 22 is bent with respect to the left piece portion 25 and the right piece portion 26, the front and rear length of the bracket 22 can be shortened, and the thickness of the digital camera 1 in the front and rear direction can be reduced. Can be thinned.

<Second Embodiment>
In the first embodiment, the inner frame portion 44 is formed integrally with the covering portion 42. On the other hand, in this embodiment, as shown in FIGS. 6 to 8, the inner frame portion 44 is formed separately from the covering portion 42, and the inner frame portion 44 is assembled to the covering portion 42.

  Here, the inner frame portion 44 is provided in a rectangular frame shape and is fitted into the opening 41 of the covering portion 42. The inner frame portion 44 protrudes downward from one surface 42 a of the covering portion 42 and protrudes upward from the other surface 42 b of the covering portion 42. The inner frame portion 44 is in contact with the light receiving surface 20 a of the image sensor 20.

  Further, even when an image sensor having a different size is used as the image sensor 20, it is only necessary to change the design of the outer frame portion 43 and the covering portion 42 according to the image sensor 20, and the inner frame portion 44 can be used without changing the design. be able to. Therefore, the evaluation of the pressing load of the inner frame portion 44 can be reduced and omitted.

  Except for what has been described above, the present embodiment is the same as the first embodiment, and the description of the same parts as those of the first embodiment will be omitted.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
In the above embodiments, the optical axis is bent by the prism 12, but the optical axis may be bent by a mirror surface. Further, the optical axis of the optical system may not be bent.
Further, when the inner frame portion 44 and the covering portion 42 are integrally formed as in the first embodiment, or the inner frame portion 44 and the covering portion 42 are separated as in the second embodiment. In the case of being formed, the outer frame portion 43 and the covering portion 42 may be formed separately and assembled. Further, the outer frame portion 43 may not be provided.
Moreover, in each said embodiment, although the lens barrel main-body part 5 of the lens barrel 4 is extended in the up-down direction, the lens-barrel main-body part 5 may be extended in the left-right direction. In this case, the entrance surface 13 of the prism 12 faces forward, as in the above embodiments, but the exit surface 15 of the prism 12 faces left or right, and the light receiving surface of the image sensor 20 is also on the right. Alternatively, it faces the exit surface 15 facing left, and the optical axis of the lens 16 is different along the left-right direction.
In each of the above embodiments, the digital camera has been described as an example. However, the imaging apparatus of the present invention has a digital camera function as well as a portable electronic device such as a mobile phone with a camera function and a PDA with a camera function. Any electronic device that is required to be thin can be used.

1 is a perspective view illustrating an imaging apparatus according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing a lens barrel housed in the image pickup apparatus and an image pickup element attached thereto in the same embodiment. 2 is a perspective cross-sectional view illustrating a lens barrel, an image sensor, and the like in the embodiment. FIG. It is the perspective sectional view showing the lower part of a lens barrel in the embodiment. It is the perspective view which showed the lens barrel etc. in the same embodiment. It is the disassembled perspective view which showed the lens barrel and the image pick-up element attached to it in 2nd Embodiment of this invention. It is the perspective sectional view showing the lower part of a lens barrel in the embodiment. It is a perspective sectional view of the state where it cut with a vertical section perpendicular to the section shown in FIG. It is the perspective sectional view showing the lower part of the lens barrel in a comparative example.

Explanation of symbols

1 Digital camera (imaging device)
2 Housing 4 Lens barrel 5 Lens barrel body 5 a Lower opening 10 Bending optical system 17 Optical filter 20 Imaging element 20 a Light receiving surface 40 Light shielding cover 41 Opening portion 42 Covering portion 43 Outer frame portion 44 Inner frame portion

Claims (5)

The light receiving surface of the image sensor is covered except for the central portion by a light-shielding covering portion in which an opening is formed in the central portion,
A frame portion surrounds the opening of the covering portion and is provided so as to protrude from the covering portion in a direction opposite to the imaging element.
The light receiving surface of the image sensor faces the opening of the lens barrel,
An optical filter is fitted into the opening of the lens barrel, the frame portion is fitted into the opening of the lens barrel and comes into contact with the optical filter, and the frame portion is closed by the optical filter. A mounting member for the element. A second frame portion is provided so as to protrude from the covering portion to the imaging element side;
The imaging element mounting member according to claim 1, wherein the imaging element is fitted into the second frame part and surrounded by the second frame part. The imaging element mounting member according to claim 1, wherein the covering portion and the frame portion are integrally formed. The imaging element mounting member according to claim 1, wherein the covering portion and the frame portion are formed separately. A housing,
A lens barrel housed in the housing;
An image sensor whose light-receiving surface faces the opening of the lens barrel;
An optical system that is mounted in the lens barrel and forms an image on a light receiving surface of the image sensor through an opening of the lens barrel;
An opening is formed at the center, and a light-shielding covering portion that covers the light-receiving surface of the image sensor excluding the center of the light-receiving surface of the image sensor,
An optical filter fitted in the opening of the lens barrel;
Surrounding the opening of the covering portion and projecting from the covering portion in a direction opposite to the imaging element, is fitted into the opening of the lens barrel and abuts on the optical filter, and is blocked by the optical filter An imaging device comprising: a frame portion that is configured to be a frame.

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