JP2019082546A - Image capturing device - Google Patents

Abstract

To provide an image capturing device capable of preventing an optical axis from shifting even when an adhesive contracts.SOLUTION: An image capturing device comprises a substrate having an image sensor mounted thereon, a lens barrel for holding lenses, a holder configured to hold the lens barrel and coupled with the substrate, and an elastic member disposed between the substrate and the holder to surround the image sensor.SELECTED DRAWING: Figure 2

Description

  One embodiment of the present invention relates to an imaging device and the like.

  In an imaging apparatus having a lens barrel and a substrate on which an imaging element is mounted, it is necessary to adjust the position of the lens barrel with respect to the imaging element and to adjust the optical axis. For the optical axis adjustment, adjustment of the distance between the imaging element and the lens in the optical axis direction (focus adjustment), adjustment of the relative position between the imaging element and the lens in the direction perpendicular to the optical axis (shift adjustment) There is adjustment of tilt with the lens (tilt adjustment). Patent Literatures 1 to 4 disclose conventional configurations for performing optical axis adjustment with high accuracy.

JP, 2005-94731, A Unexamined-Japanese-Patent No. 2006-308987 JP 2012-49621 A JP, 2016-27360, A

  In recent years, with the miniaturization and high precision of imaging devices such as cameras, there is an increasing demand for performing the optical axis adjustment with higher accuracy than in the past and for making the optical axis not deviate even after assembling the imaging device. There is. On the other hand, in the conventional configuration, when the adhesive used for assembling the imaging device expands due to high temperature, the optical axis may be shifted.

  The present invention adopts the following means in order to solve the above-mentioned problems and the like. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to the appended ones. It should be interpreted broadly to the extent that the vendor can understand technically.

One means of the present invention is
A substrate (4) on which the imaging device is mounted;
A lens barrel (2) holding a lens;
A holder (1) holding the lens barrel and connected to the substrate;
An elastic member (8) arranged to cover the imaging device, between the substrate and the holder;
It is an imaging device.

  In the imaging device having the above configuration, by disposing the elastic member, it is possible to suppress the entry of dust into the vicinity of the imaging element while stabilizing the positions of the holder and the substrate. As a result, it is possible to suppress the deviation of the optical axis and to suppress the deterioration of the captured image caused by the dust adhering to the imaging element.

In the above imaging apparatus, preferably
The elastic member applies an urging force in the optical axis direction to the substrate and the holder.

  According to the imaging device having the above configuration, for example, even if the adhesive applied between the holder and the substrate shrinks due to temperature or humidity, the position in the optical axis direction between the holder and the substrate can be stabilized. It becomes.

In the above imaging apparatus, preferably
The elastic member seals a space around the imaging device.

  According to the imaging device having the above configuration, it is possible to more effectively suppress dust from entering the periphery of the imaging element and adhering to the imaging element. Thereby, the deterioration of the captured image can be more effectively suppressed.

In the above imaging apparatus, preferably
The elastic member has a rectangular portion formed so as to cover the periphery of the imaging element, and a cylindrical portion fitted in a diameter to the lens barrel.

  According to the imaging device having the above configuration, it is possible to prevent the gap from being generated between the lens barrel and the elastic member while appropriately covering the periphery of the imaging device, and it is possible to more effectively cover the periphery of the imaging device The space can be sealed.

Further, one means of the present invention is
A substrate (4) on which the imaging device is mounted;
A lens barrel (2) holding a lens;
A holder (1) holding the lens barrel and connected to the substrate;
A cover member (8) arranged to cover the imaging device, between the substrate and the holder;
It is an imaging device.

  In the imaging device having the above configuration, the cover member can suppress dust from entering the vicinity of the imaging element. As a result, it is possible to suppress the deterioration of the captured image that is generated due to the dust adhering to the imaging element.

FIG. 1 is an external perspective view of an imaging device. FIG. 2 is an exploded perspective view of the imaging device as viewed from the front in the optical axis direction. FIG. 3 is an exploded perspective view of the imaging device as viewed from the rear in the optical axis direction. FIG. 4 is a plan view of the imaging device as viewed from the front in the optical axis direction. FIG. 5 is a cross-sectional view taken along line J-J of FIG.

  The image pickup apparatus according to the present invention is characterized in that an elastic seal member (elastic member) is disposed between the substrate and the holder so as to cover the image pickup element on the substrate in order to suppress optical axis misalignment. There is. Hereinafter, specific embodiments will be described.

  In the present specification, the center position of the lens and the center position of the light incident on the imaging device is referred to as an “optical axis”. An imaging target located on the opposite side to the imaging element with respect to the lens is referred to as a "subject". The direction in which the subject is located with respect to the lens may be referred to as "optical axis direction front" or "front side". The direction in which the imaging element is located with respect to the lens may be referred to as “rear in the optical axis direction” or “rear side”. Moreover, in each figure, the X-axis, the Y-axis, and the Z-axis which mutually orthogonally cross are shown. The Z axis is a direction parallel to the extension direction of the optical axis.

Embodiments according to the present invention will be described according to the following configuration. However, the embodiments described below are merely examples of the present invention, and the technical scope of the present invention is not to be interpreted in a limited manner. In the drawings, the same components are denoted by the same reference numerals, and the description thereof may be omitted.
1. Embodiment 2. Supplementary items

<1. Embodiment>
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the imaging device of this embodiment as viewed from the front side in the optical axis direction. 2 and 3 are exploded perspective views of the imaging device of the present embodiment, and FIG. 2 is a view seen from the front in the optical axis direction, and FIG. 3 is a view seen from the rear in the optical axis direction. FIG. 4 is a plan view seen from the front in the optical axis direction of the imaging device of the present embodiment. FIG. 5 is a cross-sectional view taken along line J-J of FIG.

  As illustrated, the imaging device of the present embodiment is configured to include the holder 1, the lens barrel 2, the substrate 4, and the elastic seal member 8. Adhesives 3a and 3b, connection screws 6 and 7 and fixtures 5 are used to connect and fix these components.

<Holder 1>
The holder 1 holds the lens barrel 2 and is connected to the substrate 4. The holder 1 has an opening 1a formed to penetrate in a cylindrical shape at the front in the optical axis direction, and the lens barrel 2 is inserted from the front in the optical axis direction inside the opening 1a in the radial direction , Is held. The holder 1 and the lens barrel 2 are diametrically fitted by screw fitting or the like. Note that the holder 1 and the lens barrel 2 are not screw fitting but simple diameter fitting, and may be fixed in position by an adhesive or the like.

  Adhesives 3 a are disposed at three positions in the rear of the holder 1 in the optical axis direction. The adhesive 3a shown in FIG. 2 and FIG. 3 shows a state after being cured and assembled, and has an annular shape. The connection screw 6 inserted into the through hole 41 of the substrate 4 is inserted into the center (opening) of the annular adhesive 3a from the rear in the optical axis direction. The connecting screw 6 penetrates the substrate 4 and the adhesive 3 a and is inserted into a screw hole 1 c formed on the rear surface of the holder 1 in the optical axis direction. The connecting screw 6 has a head 6a and a shaft 6b. A screw thread is formed inside the screw hole 1c, and is screw-engaged with the screw thread formed on the shaft 6b of the connecting screw 6. The head 6 a of the connecting screw 6 abuts on the rear surface of the substrate 4 in the optical axis direction.

  The connecting screw 6 may be replaced by a cylindrical pin having no head and formed on the holder 1. In this case, at the time of assembly, the holder 1 and the substrate 4 are coupled by caulking the end portion of the pin projecting backward in the optical axis direction from the substrate 4. At this time, the head of the crimped pin is in contact with the substrate 4 in the same manner as the head 6 a of the connecting screw 6. In addition, when this pin and the holder 1 are formed with resin, you may crimp by heat crimping which heats the head of a pin.

  In the rear surface of the holder 1 in the optical axis direction, in addition to the screw hole 1c in which the connection screw 6 is inserted, a screw hole 1d in which the auxiliary connection screw 7 is inserted is formed. The auxiliary connection screw 7 penetrating the through holes 42a and 42b of the substrate 4 is inserted into the screw hole 1d. The auxiliary connection screw 7 has a head 7a and a shaft 7b. A screw thread is formed inside the screw hole 1d, and is screw-engaged with the screw thread formed on the shaft 7b of the auxiliary connection screw 7. An adhesive 3 b is disposed between the head 7 a of the auxiliary connection screw 7 and the substrate 4.

  The holder 1 has a hole 1 b in which the fixing tool 5 is inserted in a direction (Y-axis direction) perpendicular to the optical axis. The hole 1b extends in the Y-axis direction and is formed to penetrate toward the central portion of the opening 1a, as shown in FIGS. The fixture 5 inserted into the hole 1b is a screw or the like, and pressing the lens barrel 2 in the Y-axis direction presses the lens barrel 2 toward the opening 1a to Fix the position of 2. The fixture 5 and the holder 1 may be screw-fit, may be fixed by an adhesive or the like, or may be fixed by a screw-fit and an adhesive.

<Lens barrel 2>
The lens barrel 2 is a cylindrical member extending in the optical axis direction, and holds one or more optical members including the lens 2a. The lens barrel 2 is diametrically engaged with the holder 1. The lens barrel 2 is fixed to the holder 1 by the fixture 5 as described above.

  The optical member held by the lens barrel 2 includes, in addition to the lens 2a, a lens, a spacer, an aperture plate, an optical filter (not shown), and the like. The lens including the lens 2 a is formed of a transparent material such as glass or plastic, and transmits light from the front in the optical axis direction to the rear in the optical axis direction while refracting light from the front. The spacer is a disk-shaped member having a suitable thickness in the optical axis direction, and adjusts the position of each lens in the optical axis direction. The spacer has an opening at the center including the optical axis. The aperture plate determines the outermost position of the passing light. An optical filter suppresses or blocks light of a predetermined wavelength. The optical filter includes, for example, an infrared cut filter that suppresses infrared light passing therethrough. The type and number of these optical members can be arbitrarily changed.

<Substrate 4>
The substrate 4 is a rigid rigid substrate on which electronic components including the imaging device 4a are mounted. The imaging element 4a is a photoelectric conversion element that converts the emitted light into an electric signal, and is, for example, a C-MOS sensor or a CCD, but is not limited to these. In the image pickup apparatus, an image pickup unit requiring an image pickup function other than the image pickup element 4a may be adopted.

  The substrate 4 has through holes 41, 42a and 42b into which the connecting screw 6 and the auxiliary connecting screw 7 are respectively inserted. The connection screw 6 and the auxiliary connection screw 7 are inserted into the through holes 41, 42a and 42b from behind in the optical axis direction, penetrate the substrate 4 and are inserted into the screw holes 1c and 1d of the holder 1. Thus, the connection screw 6 and the auxiliary connection screw 7 connect the substrate 4 and the holder 1. Although the through holes 41 and 42a are substantially circular, the through holes 42b are formed in the shape of a long hole extending in the X direction. Since the through hole 42b is in the form of an elongated hole, the insertion position of the auxiliary connection screw 7 can be adjusted, and this makes it possible to adjust the optical axis in the X direction. The auxiliary connection screw 7 is a connecting tool that is used as an auxiliary for stably and firmly fixing the holder 1 and the substrate 4 and is not an essential component of the present invention.

<Adhesive 3a>
As described above, the adhesive 3a is disposed between the holder 1 and the substrate 4 and around the shaft 6b of the connecting screw 6 (see FIG. 6). The adhesive 3a is liquid, jelly-like or sheet-like before curing. The adhesive 3 a is disposed apart from the outer periphery so as not to contact the outer periphery of the connection screw 6. In the optical axis direction, the adhesive 3 a is disposed without a gap between the holder 1 and the substrate 4.

<Adhesive 3b>
The adhesive 3b is disposed between the substrate 4 and the head 7a of the auxiliary connection screw 7 and around the shaft 7b of the auxiliary connection screw 7 as described above (see FIG. 5). The adhesive 3 b is disposed in contact with the outer periphery of the shaft portion 7 b of the auxiliary connection screw 7. The adhesive 3 b is liquid, jelly-like or sheet-like before curing. The adhesive 3 b may be annular since it is placed, or may be penetrated annularly by the auxiliary connecting screw 7 after placement. The adhesive 3 b is disposed to enter the through hole 42 a (or 42 b) of the substrate 4. Thereby, the substrate 4 is firmly fixed to the holder 1 in the direction (XY direction) perpendicular to the optical axis. In the optical axis direction, the adhesive 3 b is disposed without a gap between the substrate 4 and the head 7 a of the connecting screw 7.

<Elastic seal member 8>
As shown in FIGS. 2, 3 and 5, the elastic seal member 8 is disposed between the substrate 4 and the holder 1. The elastic seal member 8 of the present embodiment is formed of rubber. The elastic seal member 8 is configured to include a rectangular portion 8a and a cylindrical portion 8b.

  The rectangular portion 8a has a rectangular cross section and a cylindrical shape extending in the optical axis direction, and is disposed so as to cover the imaging device 4a while surrounding four sides of the imaging device 4a. The rear end of the rectangular portion 8 a in the optical axis direction is in contact with the front surface of the substrate 4 in the optical axis direction.

  The cylindrical portion 8 b has an annular cross section and a cylindrical shape extending in the direction of the optical axis, and is formed to be fitted to the outside in the radial direction of the lens barrel 2. The cylindrical portion 8b and the lens barrel 2 are fitted in a diameter and fixed, for example, using an adhesive. Alternatively, both may be coupled by pressing the lens barrel 2 into the cylindrical portion 8b. The front end of the cylindrical portion 8 b in the optical axis direction is in contact with the rear surface of the holder 1 in the optical axis direction.

  The elastic seal member 8 is disposed so that no gap is generated between the substrate 4, the lens barrel 2, and the holder 1, and seals the space around the imaging element 4 a.

  As described above, the elastic seal member 8 contacts the substrate 4 at the rear in the optical axis direction and the holder 1 at the front in the optical axis direction, and applies an urging force to the substrate 4 and the holder 1. More specifically, the elastic seal member 8 exerts an urging force on the substrate 4 rearward in the optical axis direction, and exerts an urging force on the holder 1 forward in the optical axis direction. Therefore, for example, even when the adhesives 3a and 3b for fixing the position of the substrate 4 and the holder 1 are contracted, the substrate 4 is applied by the biasing force applied from the elastic seal member 8 to the substrate 4 and the holder 1. And the position of the holder 1 is stabilized without changing. The elastic seal member 8 is a configuration example of the “elastic member” or the “cover member” in the present invention. The elastic seal member 8 may be formed of an elastic member such as resin instead of rubber. Further, the elastic seal member 8 may be replaced with a member having no elasticity instead of the elastic member, and even in this case, adhesion of dust to the imaging element 4a can be suppressed to some extent.

<Features of the imaging device of the present embodiment>
Thus, in the imaging device of the present embodiment, since the elastic seal member 8 is disposed between the substrate 4 and the holder 1, the position of the holder and the substrate is stabilized, and in the vicinity of the imaging device 4 a. It is possible to suppress the entry of dust. As a result, it is possible to suppress the deviation of the optical axis caused by the positional deviation between the substrate 4 and the holder 1 and to suppress the deterioration of the captured image caused by the dust adhering to the imaging element 4a.

  Further, in the imaging device of the present embodiment, since the elastic seal member 8 is configured to apply an urging force in the optical axis direction to the substrate 4 and the holder 1, the adhesive disposed between the holder 1 and the substrate 4 Even if (for example, 3a or 3b) shrinks due to temperature or humidity, it becomes possible to stabilize the position in the optical axis direction between the holder 1 and the substrate 4.

  Further, in the image pickup apparatus of the present embodiment, since the elastic seal member 8 is arranged to seal the space around the image pickup element 4a, dust enters the periphery of the image pickup element 4a and adheres to the image pickup element 4a. Can be effectively suppressed. Thereby, the deterioration of the captured image can be more effectively suppressed.

  Further, in the imaging device according to the present embodiment, since the elastic seal member 8 is configured to have the rectangular portion 8a and the cylindrical portion 8b, the lens barrel 2 and the elastic of the lens barrel 2 are appropriately covered while the periphery of the imaging element 4a is appropriately covered. It is possible to prevent a gap from occurring with the seal member 8, and more effectively, the peripheral space of the imaging element 4a can be sealed.

<2. Additional Notes>
The specific description of the embodiment of the present invention has been described above. In the above description, the description is merely an embodiment, and the scope of the present invention is not limited to the one embodiment, and can be broadly interpreted to a range that can be grasped by those skilled in the art.

  In the embodiment, the elastic seal member 8 is described by taking a configuration having the rectangular portion 8a and the cylindrical portion 8b as an example, but the elastic seal member 8 is not necessarily limited to such a shape. , Can be any shape. For example, the elastic seal member 8 may be in the form of a cylinder or a cylinder having a rectangular shape as a whole, and even with such a configuration, a certain effect can be obtained.

  In the embodiment, the connecting screw 6 and the auxiliary connecting screw 7 are used as a connecting tool for connecting the holder 1 and the substrate 4, but these need not necessarily be screws, and a connecting tool having no screw thread It may be

  The imaging device of the present invention is particularly useful as an on-vehicle imaging device mounted on an automobile or the like, in which the optical axis needs to be adjusted particularly with high accuracy and stability.

  The present invention is suitably used as an on-vehicle imaging device or the like.

DESCRIPTION OF SYMBOLS 1 ... Holder 1a ... Opening part 1b ... Hole part 1c, 1d ... Screw hole 2 .... Lens-barrel 2a ... Lens 3a, 3b ... Adhesive agent 4 ... Substrate 4a ... Imaging element 41, 42a, 42b ... Through-hole 5 ... Fixture Reference Signs List 6 connecting screw 6a head 6b shaft 7 auxiliary connecting screw 7a head 7b shaft 8 elastic sealing member 8a rectangular portion 8b cylindrical portion

Claims (5)

A substrate on which the imaging device is mounted;
A lens barrel that holds a lens,
A holder which holds the lens barrel and is connected to the substrate;
An elastic member disposed between the substrate and the holder so as to cover the imaging device;
Imaging device. The elastic member applies an urging force in the optical axis direction to the substrate and the holder.
The imaging device according to claim 1. The elastic member seals a space around the imaging device.
The imaging device according to claim 1 or 2. The elastic member has a rectangular portion formed to cover the periphery of the imaging device, and a cylindrical portion fitted in a diameter to the lens barrel.
The imaging device according to any one of claims 1 to 3. A substrate on which the imaging device is mounted;
A lens barrel that holds a lens,
A holder which holds the lens barrel and is connected to the substrate;
And a cover member disposed between the substrate and the holder and arranged to cover the imaging device.
Imaging device.

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