JP2008131397A - Dustproof member for imaging apparatus, dustproof structure for imaging apparatus, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the workability of cleaning work during the manufacturing or inspection of an imaging apparatus such as a video camera by eliminating the generation of burrs when a dustproof member is molded while avoiding flare phenomena or ghost phenomena resulting from the interposition of the dustproof member. <P>SOLUTION: A seal rubber 130 has an opening 132 through which an object image passing the translucent surface 121 of an optical filter 120 arrives at the imaging surface 141 of a CCD device 140, and dustproof portions 133 and 134 formed around the opening 132 and coming into elastic contact with the optical filter 120 and the CCD device 140, respectively. The inner surface of the opening 132 is an inclining surface 137 in which the CCD device 140 is extended as compared with the optical filter 120 side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dust-proof member of an imaging apparatus that prevents foreign matter from entering the imaging surface of an imaging element, a dust-proof structure of the imaging apparatus, and the imaging apparatus. More specifically, the present invention relates to a technique that not only prevents foreign matter from entering the image pickup surface of the image pickup device but also prevents incident light from being reflected by the dust-proof member and entering the image pickup surface of the image pickup device.

  An imaging apparatus such as a video camera forms light on an imaging surface of an imaging element (for example, a CCD (Charge Coupled Devices) device, etc.) by an optical system such as a lens or an optical filter, and the light of the image. The light and dark due to is photoelectrically converted into the amount of electric charge, which is read out sequentially and converted into an electrical signal.

  In addition, if foreign matter such as dust or dust adheres to the imaging surface of the image sensor, light from the imaging target is blocked by the foreign matter, which causes a problem that the foreign matter is imaged. Therefore, a dustproof member is interposed between the optical filter and the image sensor in order to prevent foreign matter from entering the image pickup surface of the image sensor.

  The dust-proof member is made of, for example, an elastic body such as silicon rubber, and prevents external foreign matter from entering the dust-proof member by contacting the optical filter and the image pickup element. An opening for allowing the subject image passing through the light-transmitting surface of the optical filter to reach the imaging surface of the imaging device is formed inside the dustproof portion that contacts the optical filter and the imaging device.

Here, when the high-intensity incident light through the optical filter is reflected by the dust-proof member and enters the image pickup surface of the image pickup device, there arises a problem that a flare phenomenon or a ghost phenomenon occurs. Therefore, on the optical filter side of the opening of the seal rubber (dust-proof member), a convex portion having an inclined surface inclined inward at a predetermined angle (45 °) or more with respect to a line parallel to the optical axis is provided. A technique is known in which even if incident light that has passed through a light-transmitting surface of an optical filter is reflected by an inclined surface of a convex portion, the reflected light does not enter the imaging surface of a CCD device (imaging device) ( For example, see Patent Document 1).
JP 2001-275023 A

FIG. 7 is a cross-sectional view showing a peripheral portion of a conventional seal rubber 230 described in Patent Document 1 described above.
As shown in FIG. 7, the seal rubber 230 is interposed between the optical filter 120 and the CCD device 140 to prevent foreign substances (dust, dust, etc.) from entering, and the opening 232 and the optical filter 120 side. The dustproof portion 233 and the dustproof portion 234 on the CCD device 140 side are formed. A convex portion 238 having an inclined surface 237 is provided on the optical filter 120 side of the opening 232. The CCD device 140 includes a seal glass 144 on the front surface of the CCD element 145, and is mounted on a CCD substrate (not shown) by connection terminals 146.

  However, in the conventional seal rubber 230 shown in FIG. 7 described in the above-mentioned Patent Document 1, when the convex portion 238 is formed, it is impossible to perform die cutting unless the convex ridge line portion is set as the alignment position of the mold. As a result, burrs are likely to appear at the ridge line where the molds are aligned. For this reason, it is necessary to scrape and remove burrs in post-processing, resulting in poor productivity.

  In addition, when the convex portion 238 such as the conventional seal rubber 230 is provided, irregularities are formed in the opening 232, so that it is difficult to remove foreign matters during manufacturing or inspection of the video camera. That is, when an imaging part including the optical filter 120 and the CCD device 140 is assembled, if foreign matter (dust, dust, shaved burrs, etc.) adheres to the seal rubber 230, the foreign matter is removed beforehand by a cleaning operation. It is necessary to keep. Therefore, man-hours are required for removing foreign substances in the recesses, and productivity is deteriorated.

  Therefore, the problem to be solved by the present invention is to eliminate the occurrence of burrs during molding of the dustproof member while avoiding the occurrence of flare phenomenon and ghost phenomenon due to the presence of the dustproof member, and to provide an imaging device such as a video camera. It is to improve the workability of cleaning at the time of manufacturing and inspection.

The present invention solves the above-described problems by the following means.
The invention according to claim 1, which is one of the present invention, is a dust-proof member of an imaging apparatus that is interposed between an optical filter and an imaging element and prevents foreign matter from entering the imaging surface of the imaging element. An opening that allows the subject image passing through the light-transmitting surface of the optical filter to reach the imaging surface of the imaging device, and the periphery of the opening, are elastically in contact with the optical filter and the imaging device, respectively. A dust-proof portion, and the inner surface of the opening is an inclined surface that expands on the imaging element side rather than on the optical filter side.

  The invention according to claim 4, which is another one of the present invention, is an optical filter, an image sensor, and a foreign object with respect to the imaging surface of the image sensor that is interposed between the optical filter and the image sensor. A dust-proof structure of an imaging device including a dust-proof member that prevents intrusion of the image sensor, wherein the dust-proof member includes an opening that allows a subject image that passes through a light-transmitting surface of the optical filter to reach the imaging surface of the imaging element. A dust-proof portion that is formed around the opening and elastically contacts the optical filter and the image sensor, and the inner surface of the opening is inclined such that the image sensor side is larger than the optical filter side. It is characterized by being a surface.

  Furthermore, the invention according to claim 5, which is another aspect of the present invention, is an optical filter, an image pickup device, and a foreign matter with respect to the image pickup surface of the image pickup device interposed between the optical filter and the image pickup device. A dust-proof member that prevents intrusion of the image sensor, wherein the dust-proof member includes an opening that allows a subject image that passes through a light-transmitting surface of the optical filter to reach the imaging surface of the imaging device, and the opening. And a dustproof portion that elastically contacts the optical filter and the image sensor, and the inner surface of the opening is an inclined surface that is larger on the image sensor side than the optical filter side. It is characterized by.

(Function)
The dust-proof member according to the first, fourth, and fifth aspects of the present invention includes an opening that allows a subject image that passes through the light-transmitting surface of the optical filter to reach the imaging surface of the image sensor, and And a dustproof portion that is formed around and elastically contacts the optical filter and the imaging device. For this reason, light from the imaging object enters the imaging surface of the imaging element through the opening of the dust-proof member. In addition, the dust-proof portion of the dust-proof member prevents external foreign matters such as dust and dust from entering between the optical filter and the image sensor.

  The inner surface of the opening is an inclined surface that expands on the image sensor side than on the optical filter side. In other words, an inclined surface is formed between the optical filter and the image sensor, which is inclined outward at an angle larger than a predetermined angle (0 °) with respect to a line parallel to the optical axis. Therefore, the incident light that has passed through the optical filter is directly incident on the imaging surface of the imaging element without being reflected by the inclined surface.

  According to the above invention, the dust-proof portion of the dust-proof member prevents external foreign matters such as dust and dust from entering between the optical filter and the image pickup device, so that foreign matter can be prevented from adhering to the image pickup surface of the image pickup device. Further, since the incident light that has passed through the optical filter is not reflected by the inclined surface, unnecessary reflected light does not enter the imaging surface of the imaging device, and the occurrence of flare phenomenon and ghost phenomenon can be prevented. Furthermore, since there is no need to set the mold alignment position in the inclined surface, no burrs are generated on the inclined surface, and the inclined surface is flat, so that foreign matter adheres to the inclined surface. Even so, the foreign matter can be easily removed, and the cleaning workability is improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following embodiments, as will be described later, a video camera 1 suitable for industrial use such as FA (Factory Automation) is exemplified as an imaging apparatus of the present invention. And the video camera 1 of this embodiment uses the CCD device 140 as an image pick-up element of this invention.

FIG. 1 is a perspective view showing a video camera 1 of the present embodiment.
As shown in FIG. 1, the video camera 1 of this embodiment includes a front panel 10, a rear panel 20, a bottom panel 30, and a top panel 40 that form a case. On the front side of the front panel 10 is formed a cylindrical portion 11 in which a screw for attaching a lens is engraved on the inner surface, and this cylindrical portion 11 is a lens mount for mounting the lens. Therefore, the video camera 1 can be equipped with various lenses such as a focal length according to the application. Note that an optical filter 120 and a CCD device 140, which will be described later, are attached to the rear surface side of the front panel 10 in the cylindrical portion 11.

  Here, the video camera 1 according to the present embodiment is used in, for example, a mounting machine that mounts an electronic component such as an IC chip on a printed board, an inspection apparatus that images each inspection site of a semiconductor device that is continuously supplied, and the like. It is done. That is, the electronic component is moved to the mounting part of the electronic component in accordance with the printed board, and the mounting part is imaged with high accuracy to position the electronic component. In addition, it moves to the inspection site in accordance with the supply of the semiconductor device, and inspects the presence / absence of defects by imaging the inspection site with high accuracy.

Therefore, not only the vibration due to the movement of the video camera 1 itself but also various vibrations act on the video camera 1 from a printed circuit board, an electronic component transport unit, a semiconductor device supply unit, and the like.
Thus, since the video camera 1 of this embodiment is used in a very severe environment, it is reduced in size and weight and has high vibration resistance. Specifically, the video camera 1 is about 2G. It can operate continuously for 24 hours under the vibration environment.

FIG. 2 is an exploded perspective view showing the video camera 1 of this embodiment, and shows a state in which the top panel 40 shown in FIG. 1 is removed.
As shown in FIG. 2, a CCD substrate 60 on which a CCD device 140 (see FIG. 1) is mounted is attached to the back side of the front panel 10. In addition, a connector board 70 that allows electrical connection to the outside by a connector 50 is attached to the inside of the rear panel 20. Furthermore, the bottom panel 30 holds the lower portions of the three control boards 80 on which various electronic components such as a DC / DC converter are mounted with a predetermined interval.

  Here, the CCD board 60 and the connector board 70 are electrically connected to the control board 80 by a harness (a bundle of electric wires), and the control boards 80 are electrically connected to each other by a flexible flat cable. Has been. And the upper part of each control board 80 is hold | maintained at the front panel 10 and the rear panel 20 via the holding | maintenance metal fitting 90. FIG. Therefore, the CCD board 60, the connector board 70, and each control board 80 can be arranged with high density, and the video camera 1 is reduced in size and weight.

  The CCD substrate 60 is mounted with an adjustment volume (not shown) for obtaining a correct captured image. This adjustment volume is used for electrical adjustment to match the imaging waveform, and is operated with the top panel 40 (see FIG. 1) removed. That is, in the electrical adjustment in the manufacturing process of the video camera 1, the measuring instrument probe is applied to the adjustment volume and the check land inside the video camera 1, the waveform is confirmed, and the final adjustment is performed. Do not install.

  Therefore, an opening 91 for operating the adjustment volume is formed on the upper surface of the holding metal 90 and on the end on the CCD substrate 60 side. Then, an adjustment jig is inserted from the opening 91 and the adjustment volume is operated to perform electrical adjustment, whereby an image captured by the CCD device 140 (see FIG. 1) is transmitted to each control board 80 by a predetermined electrical signal. As a result, a correctly adjusted image is output to the outside.

  Furthermore, a convex portion 92 is formed on the side surface of the holding metal fitting 90. The convex portion 92 is for causing the holding metal fitting 90 to function as a heat sink. That is, when the top panel 40 (see FIG. 1) is covered, the convex portion 92 comes into contact with the inner surface of the top panel 40. Then, the convex portion 92 is pressed against the control board 80, and as a result, the side surface of the holding metal fitting 90 comes into contact with the surface of the electronic component mounted on the control board 80. Therefore, the heat of the electronic component is diffused throughout the holding metal fitting 90, and a heat dissipation effect can be obtained.

  A notch 93 for pressing the silicon rubber 41 against the top of each control board 80 is formed at the center of the upper surface of the holding metal 90. That is, the silicon rubber 41 is affixed to the back surface (ceiling surface) of the top panel 40 (see FIG. 1). When the top panel 40 is covered, the silicon rubber 41 enters between the notches 93, and each control is performed. The substrate 80 is pressed toward the bottom panel 30. Therefore, since each control board 80 is pressed down by the silicon rubber 41, the high vibration resistance (quality reliability) of the video camera 1 of the present embodiment used in a severe vibration environment is ensured. .

  As described above, the video camera 1 of the present embodiment is reduced in size and weight and has high vibration resistance. However, in the vibration environment, the video camera 1 of the front panel 10 (particularly, the CCD substrate 60). If a foreign object such as dust or dust is present in the surrounding area, the foreign object is moved by the vibration of the video camera 1 and the foreign object adheres to the CCD device 140 (see FIG. 1) mounted on the CCD substrate 60 to capture an image. In some cases, this may cause a malfunction.

  In view of this, the video camera 1 according to the present embodiment includes a seal rubber 130 (invention of the present invention) between an optical filter 120 (see FIG. 1) attached to the back side of the front panel 10 and a CCD device 140 (see FIG. 1). (Which corresponds to a dust-proof member in FIG. 1) is interposed, and foreign matter is prevented from entering the imaging surface 141 of the CCD device 140.

FIG. 3 is an exploded perspective view showing the periphery of the front panel 10 in the video camera 1 of the present embodiment.
As shown in FIG. 3, a filter bracket 110, an optical filter 120, a seal rubber 130, and a CCD device 140 are attached to the front panel 10.

  Here, the filter bracket 110 is attached to the front side of the front panel 10. That is, a cylindrical portion 11 having an inner diameter that matches the outer diameter of the filter bracket 110 is formed on the front side of the front panel 10. A rectangular hole 12 is opened on the rear end surface of the cylindrical portion 11, and screw holes 13 are provided above and below the rectangular hole 12.

  On the other hand, on the upper and lower sides of the filter bracket 110, an insertion hole 111 for inserting the mounting screw 151 toward the screw hole 13 is provided. Therefore, the filter bracket 110 is screwed and fixed to the rear end surface of the cylindrical portion 11 of the front panel 10 by passing the mounting screws 151 through the insertion holes 111 and screwing the tips of the mounting screws 151 into the screw holes 13. The filter bracket 110 has a rectangular hole 112 that is smaller than the rectangular hole 12 of the front panel 10.

  The optical filter 120, the seal rubber 130, and the CCD device 140 are attached to the back side of the front panel 10. That is, the CCD device 140 includes a notch 142 for inserting a mounting screw 152 for attaching the CCD device 140 to the back side of the front panel 10, a positioning hole 143 for positioning the CCD device 140, and a CCD device. A connection terminal 146 for mounting 140 on the CCD substrate 60 (see FIG. 2) is provided. A pair of filter holding portions 131 are formed on the front side of the seal rubber 130, and the two corner portions on the diagonal line of the optical filter 120 are held by the filter holding portions 131.

  The optical filter 120 is larger than the rectangular hole 112 of the filter bracket 110, but has a rectangular shape that fits into the rectangular hole 12 of the front panel 10. Therefore, if the optical filter 120 is held by the filter holding unit 131 and the CCD device 140 is screwed and fixed to the front panel 10 from the back side of the seal rubber 130 by the mounting screw 152, the optical filter is brought about by the elasticity of the seal rubber 130 together with the CCD device 140. 120 is pressed against the back side of the filter bracket 110 and fixed.

FIG. 4 is a perspective view showing the back side of the front panel 10 in the video camera 1 of the present embodiment.
As shown in FIG. 4, an optical filter 120 is attached to the back side of the front panel 10. Further, a seal rubber 130 abuts against the optical filter 120 from the back side.

  Here, on the back surface of the front panel 10, there are an upper and lower convex portion 14 that sandwiches the seal rubber 130 from above and below, a left and right convex portion 15 that sandwiches the seal rubber 130 from the left and right, and an engagement protrusion 16 that engages with the positioning portion of the seal rubber 130. Is formed. Therefore, if the seal rubber 130 is fitted so as to match between the upper and lower convex portions 14, the left and right convex portions 15, and the engaging protrusions 16, the seal rubber 130 is positioned with respect to the front panel 10. Since the optical filter 120 is held by the filter holding part 131 of the seal rubber 130 as shown in FIG. 3, if the seal rubber 130 is positioned, the optical filter 120 is also positioned.

  Further, the left and right convex portions 15 are respectively formed with an engaging protrusion 17 that engages with a positioning hole 143 (see FIG. 3) of the CCD device 140 shown in FIG. 3 and a screw hole 18 for fixing the CCD device 140. Has been. Therefore, the positioning hole 143 of the CCD device 140 is fitted so as to match the engaging protrusion 17, and the mounting screw 152 (see FIG. 3) is passed through the notch 142 (see FIG. 3) of the CCD device 140 into the screw hole 18. When screwed together, the CCD device 140 is fixed to the back surface of the front panel 10 with screws while pressing the seal rubber 130.

  As described above, the optical filter 120, the seal rubber 130, and the CCD device 140 (see FIG. 3) are screwed and fixed to the back side of the front panel 10 by the mounting screws 152 (see FIG. 3). The seal rubber 130 is interposed between the two and 140. The seal rubber 130 is made of elastic silicon rubber and has a feature that the change with time is small.

FIG. 5 is a perspective view showing the seal rubber 130 in the video camera 1 of the present embodiment. 5A shows the front side of the seal rubber 130, and FIG. 5B shows the back side of the seal rubber 130.
As shown in FIG. 5, the seal rubber 130 has an opening 132, which is a rectangular hole, at the center thereof.

  Further, as shown in FIG. 5A, on the front side of the seal rubber 130 (on the side of the optical filter 120 shown in FIG. 3), the optical filter 120 is fitted and held in the upper right corner and the lower left corner of the seal rubber 130. A filter holding part 131 is formed. Furthermore, a convex dustproof portion 133 is formed around the opening 132. Further, a positioning portion 135 that matches the engaging protrusion 16 (see FIG. 4) is formed at the upper right corner of the seal rubber 130 and outside the filter holding portion 131.

  On the other hand, as shown in FIG. 5B, on the back side of the seal rubber 130 (on the CCD device 140 side shown in FIG. 3), a convex dustproof portion 134 similar to the dustproof portion 133 is formed around the opening 132. Is formed. In addition, a light-shielding portion 136 that protrudes so as to cover the upper side surface of the CCD device 140 is formed outside the dust-proof portion 134 and on the upper side surface of the seal rubber 130.

FIG. 6 is a cross-sectional view showing the positional relationship between the optical filter 120, the seal rubber 130, and the CCD device 140 in the video camera 1 of this embodiment.
As shown in FIG. 6, the seal rubber 130 is formed around the opening 132 and the opening 132 for allowing the subject image passing through the light transmitting surface 121 of the optical filter 120 to reach the imaging surface 141 of the CCD device 140. And a dustproof portion 133 that elastically contacts the light transmitting surface 121 of the optical filter 120 and a dustproof portion that is formed around the opening 132 and elastically contacts the imaging surface 141 of the CCD device 140. 134 and the like.

  The optical filter 120 is held by the filter holding part 131 of the seal rubber 130. The dustproof portion 133 of the seal rubber 130 abuts on the light transmitting surface 121 of the optical filter 120.

  The CCD device 140 further includes a seal glass 144, a CCD element 145, and a connection terminal 146, and the dust-proof portion 134 of the seal rubber 130 abuts on the imaging surface 141 of the seal glass 144. The upper side surface (end surface of the seal glass 144) of the seal glass 144 orthogonal to the imaging surface 141 is completely covered by the light shielding portion 136 of the seal rubber 130 protruding to the upper side surface of the CCD element 145.

  Here, as described above, the optical filter 120, the seal rubber 130, and the CCD device 140 are screwed and fixed to the back surface of the front panel 10 (see FIG. 3) by the mounting screws 152 (see FIG. 3). When screwing, the CCD device 140 moves toward the seal rubber 130 as the mounting screw 152 is tightened, and the seal glass 144 (imaging surface 141) of the CCD device 140 presses the dust-proof portion 134 of the seal rubber 130. It becomes like this.

  Subsequently, as the mounting screw 152 (see FIG. 3) is further tightened, the CCD device 140 and the seal rubber 130 move toward the optical filter 120, and the dust-proof portion 133 of the seal rubber 130 is the light transmitting surface of the optical filter 120. 121 comes to be pressed. Since the optical filter 120 is in contact with the back surface of the filter bracket 110 (see FIG. 3), after that, the dustproof portion 133 and the dustproof portion 134 of the seal rubber 130 are compressed to some extent.

  As described above, the seal rubber 130 is interposed between the optical filter 120 and the CCD device 140, and when these are fixed, the dust-proof portion 133 of the seal rubber 130 and the optical filter 120 (translucent surface 121) are formed. In addition to elastic contact pressure, the dustproof portion 134 of the seal rubber 130 and the seal glass 144 (imaging surface 141) of the CCD device 140 are elastically contacted. Therefore, even under a vibration environment, the dust-proof portion 133 and the dust-proof portion 134 prevent foreign matter (dust, dust, etc.) from entering between the optical filter 120 and the CCD device 140 (seal glass 144). It is possible to prevent external dust, dust, and the like from adhering to the image pickup surface 141.

  Further, the dust-proof part 133 and the dust-proof part 134 have flat contact parts (tops) with the optical filter 120 and the CCD device 140. That is, the dust-proof part 133 and the dust-proof part 134 are raised in a rib shape from the seal rubber 130 over the entire circumference, and the raised top is a flat surface (width 0.3 to 0.4 mm). Therefore, when the dustproof part 133 and the dustproof part 134 are compressed, the optical filter 120 and the CCD device 140 are brought into close contact with the flat surface, and the surface pressure is increased by the compression, thereby preventing the entry of foreign matter.

  Here, when the dust-proof part 133 and the dust-proof part 134 made of silicon rubber are in close contact with the optical filter 120 and the CCD device 140 (seal glass 144), they have a property of being integrated as if they are adhered due to a change with time. For this reason, if the seal rubber 130 is to be separated for disassembly and repair, the dust-proof portion 133 or the dust-proof portion 134 may break when it is peeled from the optical filter 120 or the CCD device 140 (the seal glass 144).

  However, in the seal rubber 130 of the present embodiment, the pressure contact portions of the dustproof portion 133 and the dustproof portion 134 are flat. Therefore, the adhesiveness between the optical filter 120 and the CCD device 140 (the seal glass 144) is improved, and the width of the dust-proof portion 133 and the dust-proof portion 134 raised in a rib shape is increased to obtain a reinforcing effect. Breakage of the dustproof part 133 or the dustproof part 134 at the time of separation can be prevented.

  Further, in the seal rubber 130 of the present embodiment, the inner surface of the opening 132 is an inclined surface 137 where the CCD device 140 side is larger than the optical filter 120 side. That is, the opening 132 has an opening size on the CCD device 140 side larger than the opening size on the optical filter 120 side, and an inclined surface 137 is formed by providing a gradient on the inner surface of the opening 132.

  Therefore, the incident light that has passed through the optical filter 120 is directly incident on the imaging surface 141 of the CCD device 140 without being reflected by the inclined surface 137. As a result, it is possible to prevent a situation in which high-intensity incident light through the optical filter 120 is reflected on the seal rubber 130 and unnecessary reflected light is incident on the imaging surface 141 of the CCD device 140 to cause a flare phenomenon or a ghost phenomenon.

  In addition, when molding the seal rubber 130, it is not necessary to set a die alignment position in the inclined surface 137, and generation of burrs on the inclined surface 137 can be prevented. As a result, it is not necessary to scrape and remove the burrs in the post-processing, so that the shaved burrs do not become foreign matters that adhere to the seal rubber 130.

  Furthermore, since the dust-proof part 133 and the dust-proof part 134 of the seal rubber 130 are formed around the opening 132 and are located on both sides of the inclined surface 137, the dust-proof part 133 and the dust-proof part 134 are in contact with each other. The offset shape is shifted. Therefore, the spring constant at the time of compression of the dustproof part 133 and the dustproof part 134 can be lowered, and even if there is a dimensional variation between the optical filter 120 and the CCD device 140, the variation is absorbed and the dustproof part 133 is absorbed. And the adhesiveness of the dustproof part 134 can be improved.

  More specifically, the position of the CCD device 140 is not determined mechanically because it is determined by the optical path length of an optical system such as a lens (not shown) or the optical filter 120. Therefore, the position of the CCD device 140 is determined in accordance with the variation of each part constituting the optical system. As a result, the amount of displacement of the seal rubber 130 also varies.

  In this case, if the variation in the amount of displacement of the seal rubber 130 is directly reflected in the variation in the compressive force, the contact pressure with respect to the optical filter 120 and the CCD device 140 will be different and adversely affect the adhesiveness. Even if it changes, it is desirable that there is little change in compressive force.

  However, since the seal rubber 130 according to the present embodiment has an offset shape in which the contact pressure positions of the dust-proof portion 133 and the dust-proof portion 134 are shifted from each other, a change in compressive force is suppressed. In addition, since variations in contact pressure with respect to the optical filter 120 and the CCD device 140 are also absorbed, the stress acting on the optical filter 120 and the seal glass 144 of the CCD device 140 can be reduced.

  Incidentally, the CCD device 140 includes a connection terminal 146 for mounting the CCD element 145 on the CCD substrate 60 (see FIG. 2). That is, the CCD device 140 is mounted by fitting the connection terminal 146 into the connector of the CCD substrate 60. As described above, the CCD element 145 is electrically adjusted by the adjustment volume of the CCD substrate 60 so that a correct captured image can be obtained by combining the imaging waveforms.

  Such electrical adjustment is performed by inserting an adjustment jig into the opening 91 of the holding metal fitting 90 shown in FIG. 2 with the top panel 40 (see FIG. 1) removed. At this time, if light from the outside that has entered through the opening 91 enters the upper side surface (end surface) of the seal glass 144, it allows light to enter from a location other than the imaging surface 141 of the CCD device 140. Therefore, the CCD element 145 is adversely affected by this unnecessary light, and there is a problem that a correct imaging waveform cannot be obtained.

  However, in the video camera 1 of this embodiment, the light shielding portion 136 is formed on the upper side surface of the seal rubber 130, and the light shielding portion 136 protrudes so as to cover the upper side surface of the CCD device 140. That is, the upper side surface (end surface) of the seal glass 144 is completely covered by the light shielding portion 136 that extends to the upper side surface of the CCD element 145.

  Therefore, the light shielding portion 136 of the seal rubber 130 can prevent light from entering from a place other than the imaging surface 141 of the CCD device 140 (the upper side surface of the CCD device 140). The light shielding portion 136 does not cover the side surfaces other than the upper side surface (the upper side of the seal glass 144) of the CCD device 140, but the side surfaces other than the upper side each control board 80 inside the video camera 1 (see FIG. 2). ) And various electronic components, it is not necessary to shield the light with the seal rubber 130.

  Further, the seal rubber 130 may need to be removed from the front side of the front panel 10 (see FIG. 3) in repairs in the manufacturing process of the video camera 1 or after-sales service in the market. That is, the seal rubber 130 uses silicon rubber as a material, and its feature is that it does not change with time, but has a drawback that dust or the like is likely to adhere. Therefore, when the CCD device 140 is attached, dust or the like adheres to the periphery of the opening 132 of the seal rubber 130, and the optical filter 120, the seal rubber 130, and the CCD device 140 are assembled without being removed. There is.

  In such a case, if the attached dust or the like is left as it is, the dust or the like moves inward from the periphery of the opening 132 in a vibration environment, advances on the optical path, and is imaged by the CCD device 140. The problem that occurs. For this reason, after assembling the peripheral portion of the front panel 10 (see FIG. 3) or when image printing is performed with the video camera 1 completed, adhesion of dust or the like to the seal rubber 130 is confirmed, or the optical filter 120 is transparent. When dust or the like adhering to the optical surface 121 or the imaging surface 141 of the CCD device 140 is displayed on the monitor screen, it is disassembled and cleaned to remove the dust or the like.

  This cleaning is performed by removing the filter bracket 110 (see FIG. 3) fixed with screws to the front panel 10 (see FIG. 3), and taking out the optical filter 120 and the seal rubber 130 from the front side of the front panel 10. Then, after the cleaning is completed, the sealing rubber 130 and the optical filter 120 are inserted into the rectangular hole 12 (see FIG. 3) of the front panel 10 in reverse order, and the filter bracket 110 is screwed and assembled.

  Therefore, the seal rubber 130 must be easily removable from the front side of the front panel 10 (see FIG. 3). In the seal rubber 130 of this embodiment, the light shielding portion 136 is partially formed outside the dustproof portion 134 (formed so as to cover only the upper side surface of the CCD device 140). Further, the light-shielding portion 136 does not get in the way and can be easily taken out.

  Further, since the inclined surface 137 of the seal rubber 130 has no irregularities and is flat, even when foreign matter (dust, dust, etc.) adheres to the inclined surface 137, the seal rubber 130 is taken out and the foreign matter can be easily removed. Can be removed. That is, compared with the conventional seal rubber 230 shown in FIG. 7, the opening 132 has no irregularities and the inclined surface 137 is flat, so that the adhesion area of foreign matters in the optical path between the optical filter 120 and the CCD device 140 is reduced. In addition to suppressing adhesion of foreign matter, removal of foreign matter is facilitated, and cleaning workability is improved.

  As described above, the video camera 1 of the present embodiment, which is reduced in size and weight for FA and has high vibration resistance (quality reliability), has a dustproof portion 133 and a dustproof portion of the seal rubber 130 even under a vibration environment. The unit 134 prevents foreign matter (dust, dust, etc.) from entering between the optical filter 120 and the CCD device 140 (seal glass 144). As a result, it is possible to prevent external dust or dust from adhering to the imaging surface 141 of the CCD device 140.

  Further, the incident light passing through the optical filter 120 is incident on the imaging surface 141 of the CCD device 140 as it is without being reflected by the inclined surface 137 due to the inclined surface 137 that is enlarged on the CCD device 140 side than the optical filter 120 side. Therefore, it is possible to prevent a situation in which high-luminance incident light through the optical filter 120 is reflected on the seal rubber 130 and unnecessary reflected light is incident on the imaging surface 141 of the CCD device 140 to cause a flare phenomenon or a ghost phenomenon.

  Furthermore, the dust-proof portion 133 and the dust-proof portion 134 are formed on both sides of the inclined surface 137, and the offset pressure positions are shifted from each other, so that the spring constant when the dust-proof portion 133 and the dust-proof portion 134 are compressed is set. The dimensional variation between the optical filter 120 and the CCD device 140 can be absorbed. In addition, the stress acting on the optical filter 120 and the seal glass 144 of the CCD device 140 is reduced.

  Further, since the opening 132 of the seal rubber 130 has no irregularities and has a flat inclined surface 137, the front panel 10 (FIG. 3) is used for repair in the manufacturing process of the video camera 1 and after-sales service in the market. Even when the optical filter 120 or the CCD device 140 is cleaned by taking out the seal rubber 130 from the front side of the reference), foreign matters can be easily removed.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to embodiment mentioned above, For example, the following various deformation | transformation is possible.
(1) In the present embodiment, the FA video camera 1 is taken as an example of the imaging device. However, the imaging device is not limited to this, and may be an imaging device other than a video camera or a video camera for various uses. In the present embodiment, the CCD device 140 has been described as an example of the image pickup device. However, the image pickup device is not limited to this and may be another image pickup device such as a CMOS (Complementary Metal Oxide Semiconductor) device.

  (2) In the present embodiment, the silicon rubber seal rubber 130 is taken as an example of the dust-proof member. However, the present invention is not limited to this, and other rubber members may be used. Further, as long as the dust-proof part 133 and the dust-proof part 134 that elastically contact the image sensor such as the optical filter 120 and the CCD device 140 are provided, the rubber member may not be used.

It is a perspective view which shows the video camera of this embodiment. It is a disassembled perspective view which shows the video camera of this embodiment, and shows the state which removed the top panel shown in FIG. It is a disassembled perspective view which shows the peripheral part of the front panel in the video camera of this embodiment. It is a perspective view which shows the back side of the front panel in the video camera of this embodiment. It is a perspective view which shows the seal rubber in the video camera of this embodiment. It is sectional drawing which shows the positional relationship of the optical filter, seal rubber | gum, and CCD device in the video camera of this embodiment. It is sectional drawing which shows the peripheral part of the conventional seal rubber.

Explanation of symbols

1 Video camera (imaging device)
120 Optical filter 121 Translucent surface 130 Seal rubber (dust-proof member)
132 Opening 133 Dust-proofing part 134 Dust-proofing part 137 Inclined surface 140 CCD device (imaging device)
141 Imaging surface

Claims (5)

A dust-proof member for an image pickup device that is interposed between an optical filter and an image pickup device and prevents foreign matter from entering the image pickup surface of the image pickup device;
An opening that allows the subject image passing through the light transmitting surface of the optical filter to reach the imaging surface of the imaging element;
A dust-proof portion formed around the opening and elastically contacting the optical filter and the image sensor, respectively.
The dustproof member for an image pickup apparatus, wherein an inner surface of the opening is an inclined surface that is larger on the image pickup element side than on the optical filter side. In the dustproof member of the imaging device according to claim 1,
The dust-proof member is formed so that a contact pressure position on the imaging element side and a contact pressure position on the optical filter side are shifted from each other. In the dustproof member of the imaging device according to claim 1,
The dust-proof member is a dust-proof member of an imaging apparatus, wherein a pressure-contact part between the optical filter and the imaging element is flat. An optical filter,
An image sensor;
A dust-proof structure of an imaging device comprising a dust-proof member interposed between the optical filter and the imaging device and preventing foreign matter from entering the imaging surface of the imaging device,
The dust-proof member is
An opening that allows the subject image passing through the light transmitting surface of the optical filter to reach the imaging surface of the imaging element;
A dust-proof portion formed around the opening and elastically contacting the optical filter and the image sensor, respectively.
The dustproof structure of an imaging apparatus, wherein an inner surface of the opening is an inclined surface that is larger on the imaging element side than on the optical filter side. An optical filter,
An image sensor;
A dust-proof member that is interposed between the optical filter and the imaging device and prevents foreign matter from entering the imaging surface of the imaging device,
The dust-proof member is
An opening that allows the subject image passing through the light transmitting surface of the optical filter to reach the imaging surface of the imaging element;
A dust-proof portion formed around the opening and elastically contacting the optical filter and the image sensor, respectively.
The image pickup apparatus, wherein an inner surface of the opening is an inclined surface that expands on the image pickup element side than on the optical filter side.

Images