JP2005309051A - Optical filter holding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount an optical filter at low cost without play. <P>SOLUTION: A light shielding cover 30 is fixedly arranged in front of a CCD element 14 through a lens holder 20. A storage opening part 34 for storing the optical filter 40 is formed in the light shielding cover 30, and an abutting part 35 and an engagement projecting part 38 are formed on the inner peripheral part of the storage opening part 34. The engagement projecting part 38 is provided with an elastic piece 37 and the engagement projecting part 38 projecting inward at the tip part of the elastic piece 37, and the engagement projecting part 38 is provided with an inclined energizing surface 38a. By pressing the optical filter 40 into the storage opening part 34, the peripheral edge part on one surface side of the optical filter 40 comes into contact with the abutting part 35, and also, the energizing surface 38a comes in contact with the peripheral edge part on the other surface side of the optical filter 40 so as to energize the optical filter 40 toward the abutting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for attaching an optical filter to a camera device such as an in-vehicle camera that captures a scene around a vehicle.

  When incorporating an optical filter such as an infrared cut filter or a low-pass filter into a camera device having an image sensor such as a CCD element, for example, the optical filter is placed on a cover glass on the image sensing surface of the image sensor via an adhesive or the like. A configuration for bonding and fixing is conceivable (first background art).

  Further, a configuration is conceivable in which an optical filter is fitted into a predetermined frame and is secured with a pin or the like (second background art).

  Further, a configuration in which the optical filter is fixed by accommodating the optical filter in a predetermined holder and pressing the optical filter with an elastic member such as a rubber plate, which is a separate member, can be considered (Third Background Art) ).

  However, in the first background art, it is necessary to perform the bonding operation in a clean environment such as a clean room so that foreign matter such as dust does not adhere to the bonding surface. In addition, the optical filter has vertical and horizontal orientations. If an adhesive is used, the adhesive can be fixed in either direction, so that there is no mistake in the mounting direction. Care must be taken to ensure sufficient accuracy. For this reason, the bonding operation is very troublesome.

  In the second background art, since the optical filter is disposed in a predetermined frame and is secured with pins or the like, the cost increases due to the presence of the retaining pins. In addition, since the optical filter is simply fitted into the frame and is secured with a pin or the like, the optical filter may rattle within the frame.

  In the third background art, since the optical filter is pushed by an elastic member, it is effective in preventing rattling of the optical filter, but an elastic member that is a separate member from the holder is used. Therefore, the material cost and the installation work cost are incurred, resulting in an increase in cost.

  Then, this invention is providing the technique which can attach an optical filter at low cost without rattling.

  In order to solve the above-described problem, the present invention provides an optical filter holding device that holds an optical filter in front of an imaging surface of an imaging element, the main body having an accommodation opening that can accommodate the optical filter, A contact portion formed on the inner peripheral portion of the housing opening and capable of contacting one side of the optical filter, and projecting on the inner peripheral portion of the housing opening and elastically deformable in the inner and outer directions of the optical filter A retaining engagement having an elastic piece and an engaging protrusion projecting inwardly of the accommodation opening at the distal end of the elastic piece and engageable in a retaining shape on the other side of the optical filter. An optical filter holding member, and the engaging convex portion is in contact with the peripheral edge portion on the other surface side of the optical filter, and the optical filter is moved to the contact portion side by an elastic return force of the elastic piece. It has a biasing surface that biases toward

  The urging surface may be formed in a shape that is inclined inward of the housing opening toward the side opposite to the contact portion.

  Moreover, the part which the said urging | biasing surface contact | abuts may further be equipped with the optical filter formed in the filter side inclined surface which can be surface-contacted with the urging | biasing surface.

  Furthermore, the engagement convex part may have a guide inclined surface that inclines outward of the accommodation opening toward the side opposite to the contact part.

  Moreover, you may further provide the light-shielding surrounding wall part arrange | positioned so that the front periphery of the said imaging surface may be enclosed.

  In addition, a plurality of the retaining engagement portions may be provided at each position where the optical filter is engaged with the optical filter from four sides.

  Further, the retaining engagement portion is formed at a position where the optical filter can be engaged with the other surface side peripheral portion of the optical filter in a retaining shape in a state in which the optical filter is fitted in the housing opening in a normal posture. May be.

  Furthermore, the optical filter is formed in a shape having different vertical and horizontal lengths, and the retaining engagement portion is configured so that the optical filter is fitted in the housing opening in a normal posture. You may be provided in each position which each engages with the other surface side peripheral part of a filter from the circumference | surroundings four directions.

  Furthermore, the contact portion and the engaging convex portion may hold the optical filter at a position close to a focal position of a lens system that is disposed in front of the imaging surface.

  According to the optical filter holding device of the present invention, the optical filter is fitted into the housing opening, the abutting portion is brought into contact with the one surface side of the optical filter, and the engaging convex portion of the retaining engagement portion is arranged on the optical filter. The optical filter can be attached at a low cost with a simple configuration and an easy operation by engaging the peripheral edge of the other surface side in a retaining manner. Further, in the attached state of the optical filter, the urging surface of the engaging convex portion comes into contact with the peripheral portion on the other surface side of the optical filter, and the optical filter is directed toward the contact portion side by the elastic restoring force of the elastic piece. Since it is energized, it is possible to effectively prevent the optical filter from rattling.

  Further, when the urging surface is formed in a shape inclined inward of the accommodation opening toward the side opposite to the contact portion, the elastic piece elastically returns inward of the accommodation opening. As a result, the urging surface abuts on the peripheral portion of the other side of the optical filter, and the optical filter is urged toward the abutting portion to prevent rattling.

  Further, if the portion of the optical filter that the urging surface abuts is formed on a filter-side inclined surface that can come into surface contact with the urging surface, the inclined surface and the filter-side inclined surface are in surface contact with each other. The filter is stably biased toward the contact portion.

  Further, when the engaging convex portion has a guide inclined surface that is inclined outwardly of the accommodation opening toward the side opposite to the contact portion, the optical filter is fitted into the accommodation opening. Further, the peripheral edge portion of the optical filter is brought into sliding contact with the guide inclined surface, and the retaining engagement portion is elastically deformed outward. Therefore, the optical filter can be easily fitted into the accommodation opening.

  Further, if a light shielding peripheral wall portion is provided so as to surround the front periphery of the imaging surface, excess incident light can be shielded, and generation of stray light in the captured image can be prevented.

  Further, when the plurality of retaining engagement portions are provided at the respective positions where the optical filter is engaged with the optical filter from four sides around the optical filter, it is possible to more reliably prevent the optical filter from rattling.

  The retaining engagement portion is formed at a position that can be retained in a retaining manner on the other surface side peripheral portion of the optical filter in a state in which the optical filter is fitted in the housing opening in a normal posture. In addition, it is possible to prevent errors and deviations in the mounting posture of the optical filter.

  Furthermore, the optical filter is formed in a shape having different vertical and horizontal lengths, and the retaining engagement portion is arranged on the other surface side of the optical filter in a state where the optical filter is fitted in the housing opening in a normal posture. If the peripheral edge portion is provided at each of the positions where it is engaged from the four sides around it, it is possible to prevent an error or a deviation in the mounting posture of the optical filter. In particular, it is possible to prevent the vertical and horizontal mounting errors of the optical filter.

  Furthermore, when the optical filter is held at a position close to the focal position of the lens system to be disposed in front of the imaging surface, the contact portion and the engaging convex portion of the optical filter Miniaturization can be achieved.

  Hereinafter, an optical filter holding device according to an embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing the overall configuration of a camera device to which an optical filter holding device is applied.

  This camera device is mounted on, for example, a front grill, a door mirror, a rear end of an automobile, and the like. Then, the imaging device captures the scenery around the vehicle such as the left and right scenery on both sides of the vehicle and the scenery in front of and behind the vehicle. These captured images are displayed, for example, on display means including an LCD (Liquid Crystal Display) installed inside the vehicle.

  The present optical filter holding device is a camera device that takes an image with an image sensor such as a general video camera device or a digital still camera device in addition to the in-vehicle camera device, and an optical filter in front of the image sensor. It can be applied to all of those provided with

  The overall configuration of the camera apparatus will be described. The camera apparatus includes a rear case 12, a CCD element 14 as an imaging element, a light shielding cover 30 incorporating an optical filter 40, a lens holder 20, and a lens system. 18.

  The rear case 12 is formed in a substantially bowl shape with one side opened, and the CCD element 14, the light shielding cover 30 and the lens holder 20 are accommodated therein. In addition, screw holes 12h are formed at four corners in the rear case 12. The front case (not shown) is attached and fixed to the front of the rear case 12 by screwing and fastening the screw into the screw hole 12h. The CCD element 14, the light shielding cover 30, the lens holder 20, and the lens system 12 are accommodated in a sealed space formed by the front case and the rear case 12.

  The CCD element 14 is disposed on the rear side of the lens system 18 in the rear case 12 while being mounted and fixed on the substrate 15. As the image pickup element, a CMOS type image pickup element or the like can be used in addition to the CCD element 14. The substrate 15 is formed with a signal processing circuit, an element control circuit, and a power supply circuit, and is connected to the outside through a wire harness (not shown).

  Near the four corners of the substrate 15, screw insertion holes 15 h for fixing to the lens holder 20 are formed.

  The light shielding cover 30 is a member for shielding extra incident light to the CCD element 14 and holding the optical filter 40 at a predetermined position in front of the CCD element 14. The configuration of the light shielding cover 30 and the optical filter 40 held thereby will be described in detail later.

  The lens holder 20 is a member for arranging and holding the light shielding cover 30 and the lens system 18 in front of the CCD element 14. The lens holder 20 protrudes from the holder main body 22 and one surface side of the holder main body 22. The support cylinder part 24 is provided.

  The support cylinder portion 24 is formed as a short cylindrical member extending in front of the CCD element 14. The lens system 18 is disposed and fixed at the front position of the CCD element 14 by inserting and holding the base end portion of the lens system 18 inside the front end side opening of the support cylinder portion 24.

  In addition, an accommodation recess (not shown) in which the light shielding cover 30 can be accommodated is formed at a position on the other surface side of the holder main body portion 22 and facing the proximal end side opening of the support cylinder portion 24. The light shielding cover 30 is configured to be interposed between the CCD element 14 and the lens system 18 in a predetermined posture by being housed and fixed in the housing recess.

  Furthermore, screw fastening portions 23 having screw insertion holes 23 h are formed in the vicinity of the four corners of the holder main body portion 22. Then, a screw (not shown) is inserted into the screw insertion hole 23h of the screw fixing portion 23 and the screw insertion hole 15h on the substrate 15 side, and is screwed and fastened to a nut or the like, whereby the substrate 15 on which the CCD element 14 is mounted and the lens The holder 20 is united. Accordingly, the light shielding cover 30 and the lens system 18 are disposed and fixed in front of the CCD element 14 via the lens holder 20.

  The lens system 18 is disposed in front of the CCD element 14 and is an optical system element for forming an image of a predetermined imaging range on the imaging surface 14a of the CCD element 14, for example, a combination of a plurality of lenses. It is composed of a lens group. This lens system is housed and held by a substantially cylindrical lens barrel.

  In such a camera device, the optical filter holding device including the light shielding cover 30 and the optical filter 40 is configured as follows.

  2 is a front view showing the light shielding cover 30, FIG. 3 is a rear view showing the light shielding cover 30, FIG. 4A is a perspective view showing a state before the light shielding cover 30 and the optical filter 40 are assembled, and FIG. FIG. 5A is a perspective view showing a state after the light shielding cover 30 and the optical filter 40 are assembled, and FIG. 5B shows a state after the assembly. It is sectional drawing.

  The optical filter 40 is an optical element that changes the intensity, spectral distribution, and the like of light that passes through the lens system 18 and enters the CCD element 14, and is, for example, an infrared cut filter or a low-pass filter. Here, the optical filter 40 is formed in a substantially rectangular plate shape.

  The light shielding cover 30 has a function as an optical filter holding member for holding the optical filter 40 in front of the imaging surface 14 a of the CCD element 14 and a function as a light shielding member for shielding excess incident light to the CCD element 14. doing.

  That is, the light shielding cover 30 is a member formed of resin or the like. In particular, in order to give an elastic force to the elastic piece 37 described later, the light shielding cover 30 is formed of an elastic resin such as PP (polypropylene), PC (polycarbonate), or PBT (polybutylene terephthalate) not containing glass. It is preferable to do.

  The light shielding cover 30 includes a cover main body portion 32, a contact portion 35, and a retaining engagement portion 36.

  The cover main body 32 is formed in a shape that can be accommodated in the accommodating recess in the holder main body 22. Here, it is formed into a substantially circular plate shape having a predetermined thickness dimension, and the protrusions 32a are formed on both sides thereof. And it is comprised so that the accommodation recessed part in the holder main-body part 22 may be accommodated and fixed with a predetermined attitude | position.

  In addition, a housing opening 34 is formed in the cover main body 32. The accommodation opening 34 is formed in a substantially square opening shape that can accommodate the optical filter 40.

  A portion of the cover main body 32 that surrounds the housing opening 34 is a light-shielding peripheral wall portion 32 b that is disposed so as to surround the front periphery of the imaging surface 14 a of the CCD element 14. The light shielding peripheral wall portion 32b allows extra light other than light that passes through the lens system 18 and is incident on the imaging surface 14a, for example, extra incident light from around the optical filter 40 and around the CCD element 14, to the imaging surface 14a. It is formed in a shape that cuts incident light.

  Further, an abutting portion 35 that can abut on one side of the optical filter 40 is formed on the inner peripheral portion of the accommodation opening 34. Here, a contact portion 35 is formed on one side of the cover main body 32 (here, on the CCD element 14 side) on the inner peripheral portion of the accommodation opening 34 so as to protrude inward. When the optical filter 40 is fitted into the accommodation opening 34 from the opening on the other surface side (here, the lens system 18 side) of the accommodation opening 34, the corresponding contact portion 35 is a peripheral edge on the one surface side of the optical filter 40. It is comprised so that it may contact | abut.

  The contact portion 35 may be formed so as to protrude over the entire inner peripheral portion of the accommodation opening 34 or may be formed intermittently.

  Further, a retaining engagement portion 36 is formed to project from the inner peripheral portion of the accommodation opening 34. Here, four retaining engagement portions 36 are formed at positions where the optical filter 40 is engaged from four sides around the optical filter 40, more specifically, at substantially intermediate positions of the four sides of the optical filter 40.

  Each retaining engagement portion 36 includes an elastic piece 37 and an engagement convex portion 38 that is formed to protrude from the tip of the elastic piece 37. The elastic piece 37 is formed in a substantially rectangular plate shape extending from the inner peripheral edge portion of the contact portion 35 toward the other surface side of the cover main body portion 32, and is formed to be elastically deformable in the inner and outer directions of the optical filter 40. Yes. Further, an engaging convex portion 38 is formed at the distal end portion of the elastic piece 37 so as to protrude inward of the accommodation opening 34.

  Then, with the one-surface-side peripheral portion of the optical filter 40 being brought into contact with the contact portion 35, the engaging convex portion 38 is in the state where the optical filter 40 is accommodated in the accommodation opening 34. It is comprised so that it may engage with the other surface side peripheral part of 40 in the shape of retaining.

  In addition, in this way, the elastic piece 37 receives a force that elastically returns to the inside of the housing opening 34 in a state in which the engaging convex portion 38 is engaged with the other surface side peripheral portion of the optical filter 40 in a retaining manner. The engaging convex portion 38 is configured to urge the optical filter 40 toward the contact portion 35 side.

  That is, the engaging convex portion 38 includes a biasing surface 38 a that is inclined inward of the accommodation opening 34 toward the opposite side to the contact portion 35, and the accommodation opening portion toward the opposite side of the contact portion 35. 34 has a guide inclined surface 38b inclined outward (see FIGS. 6 and 7).

  The urging surface 38 a is in a state where the optical filter 40 is accommodated in the accommodating opening 34 so that the peripheral edge of one surface of the optical filter 40 abuts on the abutting portion 35, and the other side of the optical filter 40. It is formed at a position in contact with the peripheral edge, that is, at a position from the proximal end side of the elastic piece 37 in the engaging convex portion 38. The optical filter 40 is urged toward the contact portion 35 by an elastic restoring force of the elastic piece 37 toward the inside of the accommodation opening 34.

  Further, the guide inclined surface 38 b is located at a position where the optical filter 40 can be slidably contacted with the outer peripheral portion of the optical filter 40 when the optical filter 40 is pushed into the housing opening 34, that is, the elastic piece 37 of the engaging convex portion 38. It is formed at a position from the tip side.

  When the optical filter 40 is pushed into the housing opening 34, the outer peripheral portion of the optical filter 40 is in sliding contact with the guide inclined surface 38 b to elastically deform the engaging projection 38 outward of the housing opening 34. It has a configuration.

  In the optical filter holding device according to the present embodiment, as shown in FIG. 6, when the optical filter 40 is pushed into the accommodation opening 34 from the other side (lens system 18 side) opening of the accommodation opening 34, the optical The outer peripheral portion of the filter 40 is in sliding contact with the guide inclined surface 38b, and the tip end portion of the retaining engagement portion 36 is elastically deformed outward. Then, the optical filter 40 is pushed further into the accommodation opening 34 until the one-surface side peripheral portion of the optical filter 40 is brought into contact with the contact portion 35. Then, the engagement convex part 38 gets over the outer peripheral part of the optical filter 40, and the front-end | tip part of the retaining engagement part 36 returns elastically inside. Accordingly, as shown in FIG. 7, the engaging convex portion 38 is engaged with the outer peripheral portion on the other surface side of the optical filter 40.

  Further, in this state where the engaging convex portion 38 is engaged with the outer peripheral portion on the other surface side of the optical filter 40, the biasing surface 38a is in a posture before the retaining engaging portion 36 is elastically restored to its original shape. It abuts on the outer peripheral portion of the other side of the optical filter 40. As a result, the force with which the retaining engagement portion 36 is elastically restored to the original shape toward the inside of the housing opening 34 applies the force for pushing the optical filter 40 into the housing opening 34 and the optical filter 40. This acts as a pressing force against the contact portion 35 side.

  Further, rattling in the thickness direction of the optical filter 40 is prevented by the force pressing the optical filter 40 toward the contact portion 35 side. Further, by causing the force for pushing the optical filter 40 to the inside of the housing opening 34 to act from the four surroundings of the optical filter 40 by the four retaining engagement portions 36, the optical filter 40 can be rattled in the flat direction. Is prevented.

  In this way, the optical filter 40 is assembled into the light shielding cover 30, and the light shielding cover 30 is attached and fixed so as to be fitted into the housing recess of the lens holder 20. Then, the substrate 15 and the lens system 18 on which the CCD element 14 is mounted and fixed are fixed to the lens holder 20 with screws or the like. Thereafter, the lens holder 20 is fixed to the rear case 12 or the front case with screws or the like, and is accommodated in the rear case 12 and the space inside the front case, and the rear case 12 and the front case are combined with screws or the like. When fixed, the camera device is completed.

  As described above, according to the present embodiment, the optical filter 40 is fitted into the housing opening 34, the abutting portion 35 is brought into contact with the peripheral edge portion on the one surface side of the optical filter 40, and the retaining engagement portion 36. Is engaged with the peripheral edge of the other surface side of the optical filter 40 and the light shielding cover 30 and the CCD element 14 are fixed, so that the optical filter 40 is placed in front of the CCD element 14. It can be fixed. For this reason, the optical filter 40 can be attached at a low cost with a simple configuration and an easy operation. In addition, when bonding and fixing as in the prior art, it was necessary to perform the installation work in an extremely clean environment in order to prevent dust and the like from adhering to the bonded part. Since it becomes unnecessary, the required cleanliness is alleviated, and the assembly workability is improved even in this respect.

  In addition, the biasing surface 38 a of the engaging convex portion 38 that is inclined inward of the accommodation opening 34 toward the side opposite to the contact portion 35 in the attached state of the optical filter 40 is the optical filter 40. Since the optical filter 40 is urged toward the abutting portion 35 side by the elastic restoring force of the elastic piece 37, the rattling of the optical filter 40 is effectively prevented. it can.

  In particular, since a plurality (four in this case) of the retaining engagement portions 36 are provided at respective positions where the optical filter 40 is engaged from the four sides around the optical filter 40, the optical filter 40 in the flat direction (up / down / left / right direction). It is possible to prevent rattling more reliably.

  Further, since the engaging convex portion 38 has a guide inclined surface 38 b that is inclined outwardly from the accommodation opening 34 toward the side opposite to the contact portion 35, the optical filter 40 is placed inside the accommodation opening 34. When the optical filter 40 is fitted, the peripheral edge portion of the optical filter 40 comes into sliding contact with the guide inclined surface 38 b, and the retaining engagement portion 36 is elastically deformed outward from the housing opening 34. Therefore, the optical filter 40 can be easily attached by pushing the optical filter 40 into the accommodation opening 34.

  Further, the light shielding cover 30 has an optical filter 40 and, in addition to the configuration that holds the optical filter 40, extra light other than the light that passes through the lens system 18 and enters the imaging surface 14a by the light shielding peripheral wall portion 32b. The configuration is such that extra incident light from around 40 or around the CCD element 14 is blocked from entering the imaging surface 14a. For this reason, mounting and fixing of the optical filter 40 and shielding of excess incident light can be realized by a single component, which contributes to simplification of the configuration.

  As in the modification shown in FIG. 8, the portion of the optical filter 40 with which the urging surface 38a abuts may be formed on the filter inclined surface 41 that can come into surface contact with the urging surface 38a.

  As a result, the urging surface 38a and the filter inclined surface 41 of the optical filter 40 are in surface contact, and the engaging convex portion 38 urges the optical filter 40 toward the contact portion 35, so that the urging force is stable. Then, it acts on the optical filter 40.

  Further, in the present embodiment, for example, the accommodation opening 34, the contact portion 35, and the retaining engagement portion 36 of the lens holder 20 are formed upside down, and the optical filter 40 can be fitted and attached from the image sensor 14 side. It may be configured.

  Further, as shown in FIG. 9D, the plurality of retaining engagement portions 136 are engaged with the peripheral edge portion of the optical filter 40 in a state where the optical filter 40 is fitted in the housing opening 34 in a normal posture. It is good to be formed in a possible position.

  That is, as shown in FIGS. 9A and 9B, some of the optical filters 40 have vertical and horizontal directions such as a low-pass filter.

  Therefore, the optical filter 140 is formed in a rectangular shape that is long in a predetermined direction (different in length and width), and a plurality of retaining engagement portions 136 formed on the light shielding cover 130 are provided with the optical filter 140 of the optical filter 140. It is formed at positions that can be engaged with four sides around 140, that is, a pair of long sides and a pair of short sides, respectively.

  In a state where the optical filter 140 is housed in the housing opening 34 in a normal posture, each retaining engagement portion 136 is engaged with a pair of long sides and a pair of short sides, respectively. On the other hand, when the optical filter 140 is slightly tilted from the normal posture (see FIG. 9C) and is fitted into the accommodation opening, each retaining engagement portion 136 has a pair of long sides and a pair of optical filters 140. By engaging each of the short sides, the optical filter 140 is fixed in a corrected state so as to be in a normal posture. Further, when the optical filter 140 is fitted into the receiving opening in a state where the optical filter 140 is largely inclined from the normal posture or rotated by 90 °, each retaining engagement portion 136 abuts and interferes with the peripheral portion of the optical filter 140. Thus, the mounting of the optical filter 140 is hindered.

  Thereby, it is possible to attach the optical filter 140 relatively easily while preventing errors and deviations in the mounting posture of the optical filter 140 (particularly the vertical and horizontal directions of the optical filter 140).

  Even if the optical filter 140 has a shape other than the substantially rectangular shape as described above, when the vertical and horizontal lengths are different shapes (for example, an elliptical shape), each retaining engagement portion 136 is moved from its four sides. By providing at each engaging position, it is possible to prevent an error in the mounting posture of the filter.

  As shown in FIG. 10, when the optical filter 240 is directly fixed to the imaging surface 214a of the CCD element 214 with an adhesive or the like, the optical filter 240 has a size corresponding to the imaging surface 214a. There is a need.

  Therefore, as in the modification shown in FIG. 11, the lens system 18 in which the abutting portion and the engaging convex portion of the light shielding cover 330 are disposed in front of the imaging surface 14 a of the CCD element 14. The optical filter 340 may be held at a position close to the focal position P.

  As a result, the optical filter 340 can be disposed at a position where the light beam incident on the imaging surface 14a through the lens system 18 becomes narrow, and therefore the size of the optical filter 40 can be made larger than that shown in FIG. The size can be reduced, and the cost can be reduced.

It is a disassembled perspective view which shows the whole structure of the camera apparatus which concerns on embodiment of this invention. It is a front view which shows a light shielding cover. It is a rear view which shows a light shielding cover. FIG. 4A is a perspective view showing a state before assembly of the light shielding cover and the optical filter, and FIG. 4B is a cross-sectional view showing the light shielding cover. FIG. 5A is a perspective view showing a state after the light shielding cover and the optical filter are assembled, and FIG. 5B is a cross-sectional view showing the state after the assembly. It is explanatory drawing which shows the state which the outer peripheral part of the optical filter slidably contacted with the guide inclined surface. It is explanatory drawing which shows the state which the engagement convex part engaged with the outer peripheral part of the optical filter. It is explanatory drawing which shows the modification regarding an optical filter part. It is explanatory drawing which shows the modification for attaching an optical filter with a normal attitude | position. It is explanatory drawing which shows the conventional problem. It is explanatory drawing which shows the modification regarding the attachment position of an optical filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 14 CCD element 14a Image pick-up surface 18 Lens system 20 Lens holder 30 Light-shielding cover 32 Cover main-body part 32b Light-shielding peripheral wall part 34 Accommodating opening part 35 Contact part 36 Detachment engagement part 37 Elastic piece 38 Engagement convex part 38a Energizing surface 38b Guide Inclined surface 40 Optical filter 41 Filter inclined surface 130 Light-shielding cover 136 Retaining engagement part 140 Optical filter 330 Light-shielding cover 340 Optical filter P Focus position

Claims (9)

An optical filter holding device that holds an optical filter in front of an imaging surface of an imaging element,
A main body portion in which an accommodation opening capable of accommodating the optical filter is formed, an abutting portion which is formed on an inner peripheral portion of the accommodation opening and can be brought into contact with one surface side of the optical filter, and the accommodation opening And an elastic piece that is elastically deformable in the inner and outer directions of the optical filter and a peripheral edge portion on the other surface side of the optical filter that protrudes inward of the accommodation opening at the tip of the elastic piece. A retaining engagement portion having an engagement convex portion engageable in a retaining shape, and an optical filter holding member.
The engagement convex portion has a biasing surface that abuts on the other surface side peripheral portion of the optical filter and biases the optical filter toward the contact portion side by an elastic return force of the elastic piece. Optical filter holding device. The optical filter holding device according to claim 1,
The optical filter holding device, wherein the urging surface is formed in a shape inclined inward of the housing opening toward the side opposite to the contact portion. The optical filter holding device according to claim 2,
The optical filter holding device further comprising an optical filter formed on a filter-side inclined surface in which the urging surface is in contact with the urging surface. The optical filter holding device according to any one of claims 1 to 3,
The optical filter holding device, wherein the engagement convex portion has a guide inclined surface that inclines outward of the accommodation opening toward the opposite side to the contact portion. The optical filter holding device according to any one of claims 1 to 4,
The optical filter holding | maintenance apparatus further provided with the light-shielding surrounding wall part arrange | positioned so that the front periphery of the said imaging surface may be enclosed. An optical filter holding device according to any one of claims 1 to 5,
The optical filter holding | maintenance apparatus with which the said several securing engagement part is provided in each position engaged with the said optical filter from the surrounding four directions. The optical filter holding device according to any one of claims 1 to 6,
The retaining engagement portion is formed at a position capable of retaining in a retaining manner on the other surface side peripheral portion of the optical filter in a state where the optical filter is fitted into the housing opening in a normal posture. Optical filter holding device. The optical filter holding device according to any one of claims 1 to 7,
The optical filter is formed in a shape having different vertical and horizontal lengths,
The retaining engagement portion is provided at each position where the optical filter is engaged with the peripheral portion on the other surface side of the optical filter from four sides around the optical filter in a state where the optical filter is fitted in the housing opening in a normal posture. Optical filter holding device. The optical filter holding device according to any one of claims 1 to 8,
The contact portion and the engaging convex portion are optical filter holding devices that hold the optical filter at a position close to a focal position of a lens system that is disposed in front of the imaging surface.

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