JP3835619B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus with improved environmental resistance.

  2. Description of the Related Art In recent years, imaging devices for various uses such as outdoor use have been put into practical use with improvement in performance such as downsizing of imaging elements such as CCD (charge-coupled device) and CMOS (Complementary Metal-oxide Semiconductor). Such techniques have been proposed.

  Patent Documents 1 to 4 disclose a technique in which a protrusion formed on the periphery of a lens barrel made of a resin material that stores and holds a lens is caulked by thermal welding so as to cover the periphery on the front side of the first lens. Has been.

  Patent Documents 5 to 8 disclose techniques for projecting the convex surface of the first convex lens from a case or the like as a method for ensuring a wide field of view range for the lens system.

  Further, Non-Patent Document 1, Patent Documents 8 and 9 are technologies used for underwater cameras and the like, in which the first wide-angle lens is directly hermetically sealed without using protective glass. It is disclosed.

  Furthermore, Patent Documents 10 to 12 disclose a technique for hermetically sealing a case opening with a lens barrel.

JP-A-2-198403 JP 11-313235 A Japanese Utility Model Publication No. 4-101511 Japanese Patent No. 2679784 Japanese Utility Model Publication No. 6-55871 JP-A-2-280107 JP-A-5-77272 Japanese Utility Model Publication No. 2-64927 JP-A-9-265035 JP 2002-90603 A JP-A-5-241227 JP-A-8-29851 Photo Industry, Vol.50, 1992, No.7, P.11-12, New Product Introduction

  However, the above-described proposed technique may not always be sufficient in environmental resistance performance such as waterproof performance, and further technical improvement has been desired. The present invention has been made in view of the current situation, and an object thereof is to provide an imaging apparatus with improved environmental resistance.

Therefore, in order to solve this problem, the present invention provides:
Imaging equipment of the present invention includes: a camera case with an opening,
A wide-angle lens group housed in a lens barrel;
A cylindrical presser member having an opening defined by an annular presser part;
A step provided on the outer periphery of the pressing member;
A first step portion is provided on the upper side of the ring-shaped projecting portion provided on the side surface formed between the convex surface on the subject side and the imaging-side surface of the first lens in the wide-angle lens group. Formed with a second step,
The first lens is positioned and accommodated in the lens barrel so that the lens barrel is not exposed from the camera case by the second step portion.
In the pressing member, the opening of the pressing member is hermetically sealed by the first sealing material disposed in the first step of the first lens and the first lens, and the one sheet The convex surface of the eye lens on the subject side is screwed and fixed to the outer peripheral portion of the barrel so that the convex surface of the eye lens protrudes outward from the opening of the pressing member,
The presser-fixed presser member has a distal end projecting from the opening of the camera case and the second sealant disposed at the stepped portion of the presser member and the presser-fixed presser member. opening of the camera case is hermetically sealed, characterized in that it is housed and fixed to said camera case. With this configuration, waterproofing is easy.
According to another aspect of the imaging apparatus of the present invention, the first lens has a second step having a diameter larger than that of the first step portion on the upper side of the ring-shaped projecting portion and the first step portion on the lower side. It is characterized by comprising a step.
According to another aspect of the imaging apparatus of the present invention, an O-ring is disposed in the first step portion so that the opening of the pressing member is hermetically sealed, and the second step portion is disposed in the end of the lens barrel. It is held by a step provided on the circumferential side.
Another aspect of the imaging apparatus of the present invention includes a camera case having an opening, a lens barrel that houses a wide-angle lens group that is positioned and fixed to each other, and an opening defined by an annular presser, A cylindrical pressing member screwed and fixed to the outer peripheral portion of the lens barrel; a step portion provided on the outer periphery of the pressing member; and a convex surface on the subject side of the first lens in the wide-angle lens group; A lens assembly having a projecting portion provided so as to form a first step portion and a second step portion on a side surface formed between the imaging side surface and the first sheet. The lens is positioned and housed in the lens barrel by the second step portion, and the pressing member includes a first sealing material disposed on the first step portion of the first lens and the first piece. An opening of the pressing member is hermetically sealed by the lens, and the subject of the first lens The lens assembly is screwed and fixed to the outer peripheral portion of the barrel so that the convex surface protrudes outward from the opening of the pressing member, and the lens assembly has a distal end portion of the pressing member fixed by screwing. The camera case so that the opening of the camera case is hermetically sealed by the second sealing material that protrudes from the opening of the camera case and is disposed at the step portion of the pressing member and the pressing member that is screwed and fixed. It is characterized by being housed and fixed in
Another aspect of the imaging apparatus of the present invention is characterized in that a coating to be applied to a subject side surface of the first lens is provided.
In another aspect of the imaging apparatus of the present invention, the camera case has a front case and a rear case, and the mechanism including the wide-angle lens group, the lens barrel, and the pressing member is sealed in the opening of the front case. After fixing, the rear surface of the front case is sealed with the rear case.
Another aspect of the imaging apparatus of the present invention is characterized in that the mechanism including the wide-angle lens group, the lens barrel, and the pressing member is housed and fixed in the front case.
According to another aspect of the imaging apparatus of the present invention, the camera case includes a front case and a rear case, and the lens assembly is provided with a protrusion, and the front case is provided with a protrusion receiving portion. The lens assembly is positioned at a predetermined position of the front case.
In another aspect of the imaging apparatus of the present invention, the first sealing member is an O-ring, and an inner diameter of the O-ring is larger than an outer diameter of the first lens, and the outer diameter of the O-ring Is smaller than the inner diameter of the pressing member.

  The pressing member may be a screw-in type, or may be fitted to the outer periphery of the lens barrel to press the first lens in the optical axis direction. The first lens may be positioned in the optical axis direction by contacting a predetermined surface on the subject side of the second lens.

  The first and second lenses may be positioned in the optical axis direction by contacting the lens barrel. Further, the coating to be applied to the subject side surface of the first lens may be eliminated.

  As described above, according to the present invention, there is an advantage that it is possible to obtain an imaging device that is suitably applied in environmental resistance performance such as waterproof performance.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

1 is a cross-sectional view of the imaging apparatus according to the present embodiment, FIG. 2 is a perspective view of the imaging unit, FIG. 3 is a front view of the imaging unit, and FIG. 4 is a perspective view in which the imaging unit is incorporated in the front case.
As shown in FIG. 1, the imaging apparatus 1 of the present embodiment includes a front case 2 and a rear case 3, and a seal 4 is inserted between the front case 2 and the rear case 3 so as to be hermetically sealed. As shown, the imaging unit 10 is incorporated in the case. The front case 2 and the rear case 3 are fixed to a boss (not shown) of the front case 2 by screwing with a screw inserted through a hole (not shown) of the rear case 3 from the rear surface of the rear case 3.

  5 and 6 are exploded perspective views of the imaging unit 10, and FIG. 7 is a cross-sectional view taken along line AA of the front view of the imaging unit 10 shown in FIG. The imaging unit 10 includes a lens assembly 20, a foam ring 40, an adjustment ring 42, a ring fixing plate 44, a lens holder 46, a CCD substrate 48, and a power supply substrate 50 in order from the subject side.

  The lens assembly 20 includes a first lens 23, a second lens 24, a diaphragm 29, a third lens 25, a fourth lens 26, a fifth lens 27, and a sixth lens 28 in order from the subject side as a wide-angle lens group. In the present embodiment, a mask is provided between the diaphragm 29 and the third lens 25 to block incident light from the effective light beam of the lens. This is increased or decreased or moved in view of actual lens performance. You may let them.

  As shown in the enlarged views of FIGS. 10 and 11, the first lens 23 has a step-cut outer peripheral portion, specifically, a first step portion 231 on the upper side of the ring-shaped step protrusion 230 (protrusion portion), and a lower portion. A second step portion 232 having a diameter larger than that of the first step portion 231 is provided on the side, and an O-ring 34 is disposed on the first step portion 231 portion. The second step portion 232 is held by a step portion 321 provided on the inner peripheral side of the distal end of the lens barrel 32, and is formed by an annular protrusion 192 of the screw-in type pressing member 30 that is screwed with the outer peripheral portion of the lens barrel 32. As shown in FIG. 11, the first lens 23 is pressed substantially in the optical axis OA direction via the first step portion 231 and the edge portion 234 (outer edge of the convex surface). At this time, the O-ring 34 is pressed by the stepped portion of the lens pressing member 30 and the first lens 23 (upper surface of the ring-shaped step protrusion 230). Thereby, the inner wall of the lens pressing member 30 and the step cut portion of the first lens 23 are hermetically sealed, and waterproof performance is obtained.

  In the lens holding member 22 that holds the fourth lens 26, the fifth lens 27, and the sixth lens 28, the three key grooves 21 are linear, and the position at which the outer periphery of the lens holding member 22 is equally divided into three. Provided in relation. In this figure, only one keyway 21 is represented. In this embodiment mode, the number is not limited to three and can be provided as appropriate.

  The foam ring 40 is made of foamed rubber, has an annular shape, and is inserted into the lens assembly 20. The adjustment ring 42 is threaded on the inside and is fitted to the lens assembly 20 so as to be freely rotatable.

  The ring fixing plate 44 is fixed to the lens assembly 20 by first and second tap tight screws 80 and 82 so as to sandwich the adjustment ring 42. At this time, the design is taken into consideration so that the adjustment ring 42 does not fall off while the rotation degree of the adjustment ring 42 is maintained.

  The lens holder 46 is linearly provided with three keys 47 that are key-fitted with the three key grooves 21 provided in the lens holding member 22 inside. In this figure, one key 47 is represented. In this embodiment mode, the number is not limited to three and can be provided as appropriate.

  Further, the lens holder 46 is configured so that a male screw is processed to a predetermined length on the outer periphery thereof and is screwed with a screw applied to the inside of the adjustment ring 42. Therefore, when the adjustment ring 42 rotates, the key fitting serves as a guide, and the lens holder 46 moves back and forth in the optical axis direction without rotating.

  When the lens holder 46 is in a predetermined position just before the lens assembly 20 is fitted to the designed focus position, the end of the lens holder 46 close to the subject comes into contact with the foam ring 40. Due to the pretension generated when the foam ring 40 is compressed by being pushed by the lens holder 46, the threaded portion in which the adjustment ring 42 and the lens holder 46 are fitted and the entire structure of the adjustment ring 42 are unidirectional. It is offset and is not affected by the dimensional change of the accommodation portion of the adjustment ring 42 due to backlash of the threaded portion or variations in the component size.

  The ring fixing plate 44 is formed with a female thread portion 45 that is parallel to the outer periphery of the adjustment ring 42. By attaching the ring fixing screw 56 at the pointed end to the female thread portion 45 and integrating the adjustment ring 42 and the ring fixing plate 44, the focus is securely fixed. Further, since the lens barrel 32 is not directly fixed when the focus is fixed, a load is not directly applied to the lens. Therefore, the lens is not distorted, and the deterioration of the imaging quality can be avoided.

  A CCD substrate 48 provided with a CCD as an imaging device is fixed to the lens holder 46 by third and fourth tap tight screws 84 and 86. As described above, the lens holder 46 is key-fitted to the lens assembly 20, and its position is adjusted by the adjustment ring 42. By appropriately managing the accuracy of each component, the so-called “ Positioning called “vertical alignment” or “tilt adjustment” is not required. By attaching the CCD substrate 48 so as to be perpendicular to the lens holder 46, the imaging surface becomes perpendicular to the optical axis direction. Therefore, the adjustment of the imaging surface may be performed only in the X and Y axis directions and the rotation direction (θ) when the optical axis direction is the Z axis direction. The tap tight screw may be a tapping screw or a normal screw depending on circumstances.

  A power supply substrate 50 having a function of supplying power to the CCD substrate 48 and outputting a signal output from the CCD substrate 48 to the outside of the imaging unit 10 is attached to the CCD substrate 48. The imaging unit 10 is screwed to the front case 2 with first and second exterior set screw holes 92 and 94 provided in the lens assembly 20.

  With the above configuration, focus adjustment is possible without adjusting the lens itself, and the efficiency of adjustment work is improved. In addition, by using the adjustment ring 42, it is possible to independently perform focus adjustment and so-called “optical axis adjustment” in which the lens optical axis coincides with a predetermined pixel of the image sensor. Further, since the focus can be fixed by fixing the adjustment ring 42, it is possible to avoid the lens from being distorted without applying a load directly to the lens.

  The lens assembly 20 will be described in detail. FIG. 8 is a cross-sectional view of the lens assembly 20, and FIG. 9 is a cross-sectional view in which the opening of the front case 2 is sealed with the pressing member 30 and the first lens 23. A lens barrel 32 is disposed on the subject side of the lens assembly 20, a first lens 23 is disposed on the subject side of the lens barrel 32, and an O-ring that is a sealing material is provided in a step-cut structure on the outer peripheral portion of the first lens 23. 34 is disposed, and the first lens 23 is pressed in the direction of the optical axis OA by the pressing member 30 via the O-ring 34. Here, the O-ring 34 is formed of hydrogenated nitrile butadiene rubber (HNBR). Nitrile-Butadiene Rubber (NBR) is generally used as a sealing material for waterproof cameras due to its oil resistance and weather resistance. Further, HNBR that improves the ozone resistance, heat resistance, and weather resistance of NBR and extends the deterioration life is more suitable as a sealing material. The position of the first lens 23 in the direction of the optical axis OA is defined by a contact between a predetermined surface on the image plane side of the first lens 23 and a predetermined surface on the subject side of the second lens 24.

  As shown in FIG. 9, a step 55 is formed at the peripheral portion of the pressing member 30, and an O-ring 54 different from the above-described one is arranged on the step 55. When the pressing member 30 is inserted into the opening of the front case 2, the protrusion 91 (shown in FIG. 2) provided on the lens assembly 20 is positioned in a not-shown recess provided on the back surface of the front case 2, and is provided on the lens assembly 20. The opening of the front case 2 is sealed by the pressing member 30 by screwing to a boss (not shown) provided on the back surface of the front case 2 with a screw inserted through the hole 90.

  10 and 11 are enlarged views of the region 70 shown in the cross-sectional view of the lens assembly 20 in FIG. 8, and a structure in which the opening of the lens assembly 20 is sealed by the first lens 23 will be described.

  The first lens 23 is held and housed on the subject side of the lens barrel 32, and a small claw-like and annular protrusion 192 directed inward is provided at the end of the pressing member 30. By screwing the pressing member 30 into the barrel 32, the O-ring 34 disposed between the first lens 23 and the pressing member 30 is pressed and deformed, and the first lens 23 is positioned at the first step portion 231 thereof. In this state, the opening of the pressing member 30 is hermetically sealed by the first lens 23. At this time, the following design considerations are taken.

  First, the inner diameter of the O-ring 34 is designed to be larger than the outer diameter of the first step portion 231 of the first lens 23, and the outer diameter of the O-ring 34 is designed to be smaller than the inner diameter of the holding member 30. In this way, as shown in FIG. 10, the O-ring before screwing the presser member 30 into the lens barrel 32 is disposed without being pressed and deformed, and even after the presser member 30 shown in FIG. The O-ring 34 can avoid contact with the inner wall surface of the pressing member 30 and the edge portion 234 (outer edge of the convex surface) of the first lens 23 so as to generate a large frictional force. As a result, unnecessary frictional force and twisting force in the rotational direction are not generated on the O-ring 34, and the O-ring 34 is not easily damaged.

  Furthermore, it has been established as a common sense of design that an antireflection coating is applied to the first lens on the object side in order to prevent irregular reflection inside the lens and ghost, flare and the like due to backlight in the optical design. However, in the case of an imaging device for outdoor use, where the surface of the first lens is exposed and dust or the like can hit the lens surface due to wind or the like, a part of the coating on the surface of the first lens is peeled off, and photographing is performed. Could cause degradation of image quality. Also, cracks in the coating due to thermal expansion cause similar problems. Therefore, in the present embodiment, in the case of an imaging device used in a bad environment, the lens outside the first lens is abolished and the ghost, flare, and the like are not easily generated in this case, contrary to conventional design common sense. It is configured.

  Of course, as long as the imaging device is not used in a bad environment, the coating may be applied as usual. On the other hand, the coating of the first lens may be abolished when there is a possibility that some object may hit the first lens even when it is for indoor use, or when it is susceptible to a change in environmental temperature.

  The imaging apparatus of the present embodiment that employs a structure in which the opening of the front case 2 is sealed by the pressing member 30 is disclosed in, for example, FIG. Compared to the structure of the following, there are the following operational effects.

(1) Temperature characteristics In an outdoor camera, the exposed portion is directly exposed to the outside air or receives direct sunlight, so that the temperature fluctuation is large. If the lens barrel is exposed outside the case, the lens barrel will be distorted, twisted and deformed due to temperature fluctuations, and the lens mounting position accuracy will be reduced. The lens barrel is inherently sophisticated enough to affect optical performance with a deviation of 1/100 mm or less.
On the other hand, as long as the lens barrel is not exposed from the case as in the present embodiment, the lens mounting position accuracy is not affected even if the pressing member 30 is slightly deformed. The lens mounting position accuracy is compensated by the lens barrel. The lens pressing member 30 can be further prevented from being deformed by heat by being formed of a metal material such as an alumite-processed aluminum material or stainless steel material.

(2) Intensity Outdoor cameras, particularly in-vehicle cameras, may exert a force on the camera part during car washing or maintenance. If the lens barrel is exposed to the outside, a force is directly applied to the lens barrel and the lens barrel is deformed, which may affect the lens mounting position accuracy. On the other hand, if the lens barrel is not exposed from the case as in the present embodiment, the force is applied to the holding member 30 rather, the force applied to the lens barrel is suppressed, and the deformation of the lens barrel is suppressed. Therefore, it is difficult to affect the accuracy of the lens mounting position. It should be noted that if the lens pressing member 30 is made of the above-described metal material, deformation due to external impact can be further prevented.

(3) Resistance to chemicals Outdoor cameras, especially mounted cameras, are easily exposed to oils and oils such as wax, and can be corroded by corrosive chemicals such as polymers. In the configuration where the lens barrel is exposed, there is a concern that the lens mounting position accuracy may be reduced due to the corrosion of the lens barrel, but in this embodiment, the lens barrel is not exposed from the case, so that the lens barrel is not corroded and the lens mounting position Accuracy can be maintained. In addition, if the lens holding member 30 is comprised with the above-mentioned metal material, corrosion can be prevented more.

(4) Tamper resistance Outdoor cameras, especially in-vehicle cameras, etc., must be assumed to be mischievous from the outside. If the lens barrel is exposed, a force is directly applied to the lens barrel, causing lens displacement. Moreover, there is a possibility that the first lens may come off by cutting or peeling off the heat-welded portion with a cutter or the like. On the other hand, in this embodiment, since the lens barrel is not exposed from the case, the first lens is not detached unless the case is opened, and the durability is excellent. In addition, if the lens holding member 30 is comprised with the above-mentioned metal material, tamper-proof performance will improve further.

(5) Aging characteristics Each member of the apparatus deteriorates due to a change with time. In particular, the deterioration of the portion exposed to the outside is faster than that of the internal member. In the configuration in which the lens barrel is exposed and the lens is pressed against the lens barrel by heat welding, there is a concern that the pressing portion will creep-break and the lens may come off. On the other hand, in the present embodiment, the lens barrel is not exposed from the case, and the first lens is not easily detached, and is resistant to changes with time. It should be noted that if the lens pressing member 30 is made of the above-described metal material, it is more resistant to changes with time.

(6) Maintainability In the configuration in which the lens is caulked to the lens barrel by heat welding, it is necessary to replace the lens and the lens barrel at the time of maintenance, which is costly. In this embodiment, the lens is integrated with the lens barrel. Since the first lens is not fixed to the lens, the lens, the lens barrel and the pressing member can be exchanged separately, which is advantageous in terms of cost.

(7) Manufacturability In the configuration in which the lens is pressed onto the lens barrel by thermal welding, the dimensional variations of all the parts to be fixed by thermal welding are overlapped. Although it is difficult to keep constant, in the configuration of the present embodiment, since the lens is not fixed to the lens barrel by heat, the mounting position of the lens does not depend on the dimensional variation of the parts, and the process management It is advantageous in terms of yield. If the lens pressing member 30 is made of the above-described metal material, the lens mounting position accuracy is further improved.

(8) Waterproof performance Generally, when performing hermetic sealing with an O-ring, that is, sealing, the compression rate when the O-ring is pressed and deformed is set to 8% as a lower limit and 40% as an upper limit. It is preferable to change the control value of the compression ratio depending on the wire diameter of the ring. That is, when the wire diameter is small, the compression ratio is increased in order to increase the contact area, and conversely, when the wire diameter is large, it is not necessary to take an excessive contact area, so the compression ratio may be small. The compression rate is generally set in consideration of tolerance and aging deterioration.

  On the other hand, according to publicly disclosed materials by manufacturers, etc., waterproofing with O-rings has a compression rate of 15% to 40% at a wire diameter of 2 mm or less, a compression rate of 10% to 30% at a wire diameter of less than 2 to 4 mm, and a wire diameter of 4 mm. In the above, a compression rate of 8% to 20% is considered good. In the present embodiment, in consideration of compression set, a margin of 5% is provided on the high compression side, and the management value of the compression rate is 15% to 35%.

  As described above, the compression ratio must be strictly controlled when sealing with an O-ring. However, in the configuration in which the lens is pressed against the lens barrel by heat welding, as described above, the caulking portion is caused by the dimensional variation of the lens components. Therefore, it is difficult to secure a certain amount of caulking with the heat welding jig. As a result, the compression ratio of the O-ring varies, and it is difficult to achieve a desired waterproof performance. On the other hand, according to the configuration of the present embodiment, since the compression rate of the O-ring can be managed very easily by managing the screwing amount and screwing force of the presser member, the yield can be improved and the desired waterproof performance can be provided. .

  If the lens pressing member 30 is made of the above-mentioned metal material, the compression rate of the O-ring can be managed more strictly. In addition, since the dimensional accuracy is improved as compared with a general resin molded product, the management of the compression rate is further facilitated.

(9) Downsizing In the configuration in which the lens is pressed against the lens barrel by heat welding, it is difficult to manage the compression rate of the O-ring as described above, so that only a diameter of the O-ring or more can be adopted, and downsizing is achieved. Is difficult. On the other hand, with the configuration of the present embodiment, an extremely small diameter O-ring can be adopted, and the apparatus can be designed to be smaller. Also in this case, if the lens pressing member 30 is made of the aforementioned metal material, the compression rate of the O-ring can be managed more strictly, which contributes to further miniaturization.

(10) Vibration resistance In the configuration in which the lens is pressed against the lens barrel by thermal welding, there is a concern that the presser may be released due to vibration of the vehicle or the like, particularly in the case of an in-vehicle camera or the like. On the other hand, such a problem does not occur in the configuration of the present embodiment.

(11) Others In the configuration of the present embodiment, in addition to the above, by changing only the pressing member, it is possible to deal with cases having different opening dimensions, and thus the degree of freedom in design is high. Further, by forming the pressing member exposed to the outside with the above-described metal or the like, engraving silk printing or the like can be performed on the pressing member, and aesthetics can be easily improved by performing a decoration process or the like. .

  The imaging apparatus according to the present embodiment further has the following operational effects compared to, for example, a structure in which the opening of the front case disclosed in Patent Document 10 and Patent Document 5 described above is sealed by the first lens. Play.

  In the above-described prior art, the mounting position accuracy is ensured by the front case in which the first lens is generally formed of resin. On the other hand, the lens after the second lens is also held and housed in a lens barrel generally formed of resin. However, since the lens barrel itself is attached to the front case, the positional accuracy after the second lens. In addition to the accuracy of the lens barrel itself, the accuracy of the mounting position between the lens barrel and the front case deteriorates. Therefore, the accuracy between the first lens and the second lens deteriorates, and there is room for improvement in the performance of the optical system. On the other hand, in the present embodiment, since the distance between the first lens and the second lens can be determined by the surface accuracy of each lens, an imaging apparatus with very high optical system accuracy is realized.

  The above is the embodiment of the present invention. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each of those components and combinations thereof, and such modifications are also within the scope of the present invention.

  According to the present invention, it is possible to provide an imaging apparatus with particularly improved environmental resistance.

It is sectional drawing of the imaging device which concerns on embodiment. It is a perspective view of the image pick-up unit concerning an embodiment. It is a front view of the image pick-up unit concerning an embodiment. It is the perspective view which incorporated the imaging unit in the front case concerning an embodiment. It is a disassembled perspective view of the imaging unit concerning an embodiment. It is another disassembled perspective view of the imaging unit which concerns on embodiment. It is AA sectional drawing of the imaging unit which concerns on embodiment. It is sectional drawing of the lens assembly which concerns on embodiment. It is sectional drawing which sealed the opening of the front case which concerns on embodiment with the pressing member, and sealed the opening of the pressing member with the 1st lens. It is sectional drawing which sealed the opening of the lens assembly with the 1st lens, and is the state before pressing with the pressing member. It is sectional drawing which sealed the opening of the lens assembly with the 1st lens, and is the state after pressing with the pressing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Front case 3 Rear case 10 Imaging unit 20 Lens assembly 23 First lens 30 Holding member 32 Lens tube 34, 54 O-ring

Claims (3)

A camera case with an opening;
A wide-angle lens group housed in a lens barrel;
A cylindrical presser member having an opening defined by an annular presser part;
A step provided on the outer periphery of the pressing member;
A first step portion is provided on the upper side of the ring-shaped projecting portion provided on the side surface formed between the convex surface on the subject side and the imaging-side surface of the first lens in the wide-angle lens group. Formed with a second step,
The first lens is positioned and accommodated in the lens barrel so that the lens barrel is not exposed from the camera case by the second step portion.
In the pressing member, the opening of the pressing member is hermetically sealed by the first sealing material disposed in the first step of the first lens and the first lens, and the one sheet The convex surface of the eye lens on the subject side is screwed and fixed to the outer peripheral portion of the barrel so that the convex surface of the eye lens protrudes outward from the opening of the pressing member,
The presser-fixed presser member has a distal end projecting from the opening of the camera case and the second sealant disposed on the stepped portion of the presser member and the presser-fixed presser member. An image pickup apparatus , wherein an opening of a camera case is hermetically sealed and accommodated and fixed in the camera case. The first lens includes a first step portion on an upper side of the ring-shaped protrusion and a second step portion having a diameter larger than that of the first step portion on the lower side. The imaging apparatus according to 1. An O-ring is disposed on the first step portion so that the opening of the pressing member is hermetically sealed, and the second step portion is held by a step portion provided on the inner peripheral side of the lens barrel tip. The imaging apparatus according to claim 1 or 2, wherein

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