Imaging apparatus

Abstract

To provide an imaging apparatus that has high shock resistance performance without affecting imaging and regardless of the angle of view of a lens unit.SOLUTION: An imaging apparatus 100 has: a dome cover 111; a housing 141; a replaceable lens unit that has a flange part 121a on one side of an optical axis direction of a lens; a lens holder 131 that holds the other side of an optical axis X direction of the lens unit; a lens protection unit 142 that is removably attached to the housing, and is arranged to surround the periphery of the flange part; and a lens movable table 143 that determines the position of the lens unit in the optical axis direction according to the angle of view Θ of the lens unit. The lens movable table determines the position of the lens unit so that the lens unit is arranged farther away from the dome cover in a case where a super-wide angle lens unit 122 with a larger angle of view is attached to the lens holder, compared to a case where a standard lens unit 121 is attached to the lens holder.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an imaging device. [Background technology]

[0002] Currently, surveillance cameras are used in a variety of locations regardless of installation location. Some dome-type surveillance cameras (dome cameras) have high impact resistance. Conventional dome cameras have a space between the dome cover and the lens unit that allows deformation of the dome cover. Even if the dome cover is deformed, the dome cover does not hit the lens unit, so the camera has high impact resistance.

[0003] However, with interchangeable lens dome cameras, when a user replaces the lens unit with a longer one, the space between the dome cover and the lens unit becomes smaller, resulting in a decrease in impact resistance, which has been an issue.

[0004] In the structure disclosed in Patent Document 1, an elastic member is disposed between the housing and the lens holder. The flange of the lens unit is abutted against the housing, the position of the lens unit is fixed at this abutment, and a distance is secured between the dome cover and the lens unit, providing space for the dome to deform, thereby ensuring impact resistance. Furthermore, a part of the housing that protrudes beyond the lens unit is disposed around the flange of the lens unit, so that the dome cover does not hit the lens unit when it deforms. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6983212 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the structure of Patent Document 1, if the lens unit is changed to an ultra-wide-angle lens unit or an omnidirectional lens unit, part of the housing will be captured within the angle of view, limiting the angle of view of the lens unit that can be used.

[0007] In view of the above circumstances, an object of the present invention is to provide an imaging device that has high impact resistance regardless of the angle of view of the lens unit, without affecting image capture. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, an imaging device as one aspect of the present invention comprises a dome cover, a housing, a replaceable lens unit having a flange portion on one side in the optical axis direction of the lens, a lens holder that holds the other side of the lens unit in the optical axis direction, a lens protection member that is detachable from the housing and arranged to surround the flange portion of the lens unit, and a positioning member that determines a position of the lens unit in the optical axis direction in accordance with the angle of view of the lens unit, wherein the positioning member determines the position of the lens unit so that the lens unit is positioned farther from the dome cover when a second lens unit having a larger angle of view than the first lens unit is attached to the lens holder than when a first lens unit is attached to the lens holder. Effect of the Invention

[0009] According to the present invention, it is possible to provide an imaging device that has high impact resistance performance regardless of the angle of view of the lens unit, without affecting image capture. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a dome camera according to a first embodiment. [Diagram 2] FIG. 1 is a perspective view of a dome camera according to a first embodiment; [Diagram 3] FIG. 11 is a cross-sectional view of a dome camera according to a second embodiment. [Figure 4] FIG. 11 is a cross-sectional view of a dome camera according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiment for carrying out the present invention will be described in detail with reference to the attached drawings. The embodiment described below is one example of a means for realizing the present invention, and should be appropriately modified or changed depending on the configuration of the device to which the present invention is applied and various conditions, and the present invention is not limited to the following embodiment.

[0012] <Embodiment 1> Hereinafter, a dome camera (imaging device) 100 according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is an example of a cross-sectional view of the dome camera 100 in the first embodiment. The left diagram in Fig. 1 shows a cross-sectional view of the dome camera 100 when a standard lens unit 121 is used. The right diagram in Fig. 1 shows a cross-sectional view of the dome camera 100 when an ultra-wide-angle lens unit 122 is used. Fig. 2 is an example of an exploded perspective view of the dome camera 100 in the first embodiment.

[0013] Dome camera 100 has a dome cover 111, a standard lens unit 121, a lens holder 131, a sensor 132, a sensor board 133, a coil spring 134, a front cover 141, a lens protection unit 142, a lens moving stand 143, and a rear cover 144. When using an ultra-wide-angle lens unit 122 (described later) instead of the standard lens unit 121, lens protection unit 142 is removed for use. Dome camera 100 is a dome-shaped surveillance camera used in environments such as outdoors, inside or on a building site, and inside vehicles such as buses and trains.

[0014] The dome cover 111 is a cover member made of transparent or translucent plastic (for example, resin such as PC (polycarbonate)). The dome cover 111 is configured in a hemispherical shape. The dome cover 111 is attached and fixed to an exterior component (not shown) by fastening members such as screws or adhesives. A lens unit and an imaging sensor are disposed inside the dome cover 111. Specifically, the lens unit and the imaging sensor are covered by the hemispherical dome cover. The dome cover 111 functions as a protective cover that protects the lens unit and the imaging sensor from raindrops, dust, external impacts, and the like. The dome cover 111 does not have to be a complete hemisphere, and may have a spherical surface in part. Alternatively, it may be made of a polyhedron.

[0015] The standard lens unit (first lens unit) 121 is an interchangeable lens unit having a field angle (imaging field angle) θ1. The field angle θ1 is, for example, 70 degrees. Note that the diagonal field angle θ1 being 70 degrees is merely an example, and is not limited to 70 degrees, and can be any value such as 60 degrees or 65 degrees.

[0016] The super-wide-angle lens unit (second lens unit) 122 is an interchangeable lens unit having an angle of view (imaging angle of view) θ2. The angle of view θ2 is, for example, 150 degrees. In this manner, the super-wide-angle lens unit 122 is configured to have an angle of view θ2 larger than the angle of view θ1 of the standard lens unit 121. Note that the angle of view θ1 of 150 degrees is merely an example, and is not limited to 150 degrees, and may be any angle such as 145 degrees or 155 degrees. Both the standard lens unit (first lens unit) 121 and the wide-angle lens unit (second lens unit) 122 can be attached interchangeably to the dome camera 100 of this embodiment.

[0017] The standard lens unit 121 and the ultra-wide-angle lens unit 122 are lens units including a lens and a part for holding the lens. The standard lens unit 121 and the ultra-wide-angle lens unit 122 of this embodiment are configured as fixed-focus lens units. The standard lens unit 121 and the ultra-wide-angle lens unit 122 have a flange portion 121a on the front side of the lens unit (one side in the optical axis direction of the lens). The standard lens unit 121 and the ultra-wide-angle lens unit 122 have a screw-type mount portion on the rear side of the lens unit (the other side in the optical axis direction of the lens). Here, in this embodiment, the front side refers to the subject side in the imaging optical axis X direction, and the rear side refers to the imaging surface side in the imaging optical axis X direction. Hereinafter, when simply described as a lens unit, both the standard lens unit 121 and the ultra-wide-angle lens unit 122 are included.

[0018] Lens holder 131 has a screw-type lens mount portion. A male screw is formed on the lens unit side, and a female screw is formed on the lens holder side. Lens holder 131 holds standard lens unit 121 and ultra-wide-angle lens unit 122 via the lens mount portion. By rotating the lens unit, it is possible to attach and detach the lens unit and adjust the focus of the image.

[0019] The sensor 132 is an imaging element such as a CMOS image sensor (image sensor). The sensor board 133 is an electric board on which the sensor 132 and the like are mounted. The sensor board 133 is fixed to the lens holder 131 by being fastened to the lens holder 131 with screws 135. This causes the sensor 132 to be supported by the lens holder 131. A sealing member such as a sensor rubber (not shown) that prevents dust from entering the peripheral area of ​​the sensor 132 from the outside is disposed between the sensor board 133 and the lens holder 131. The sensor board 133 is connected to a main board (not shown) by an electric cable (not shown) or the like. The main board (not shown) performs a predetermined process on the image captured by the sensor 132 and outputs the image to an external device or the like.

[0020] The front cover (housing) 141 is a cover member (front lens cover) that surrounds the front side of the imaging unit. Specifically, the front cover 141 is disposed outside the front periphery of the lens holder 131 as a part of the optical system. In addition, a part of the front cover 141 is formed in a substantially hemispherical shape and configured to be attachable to the rear cover 144.

[0021] The rear cover 144 is a cover member (rear lens cover) that surrounds the rear side of the imaging unit. The rear cover 144 is formed in a substantially hemispherical shape so as to cover the rear side of the lens holder 131, and is fixed by being attached to the front cover 141 with a fastening member such as a screw (not shown). The front cover 141 and the rear cover 144 are combined and attached to each other to form a spherical portion at least a part of which is spherical. In this embodiment, the imaging unit is composed of the standard lens unit 121 (or the super wide-angle lens unit 122), the lens holder 131, the sensor 132, the sensor board 133, etc.

[0022] The lens protection part 142 functions as a lens protection member that protects the standard lens unit 121 when the dome cover 111 receives an impact or the like. The lens protection part 142 is arranged so as to be detachable from the front cover 141. For example, assume that a female thread part is formed in the front cover 141 and a male thread part is formed in the lens protection part 142. In that case, by using a fastening member such as a screw between the male thread part of the front cover 141 and the female thread part of the lens protection part 142, the lens protection part 142 can be attached and detached.

[0023] An opening (through hole) is provided in the front cover 141, and a female screw portion is formed on the inner surface of the opening. A male screw portion is formed on the outer surface of the lens moving stage 143.

[0024] The lens moving stage 143 functions as a lens positioning member that determines the position of the lens unit in the optical axis direction (lens unit position). The lens moving stage 143 is configured (positioned) to be movable with respect to the front cover 141 by an engagement (screw-in engagement) between a threaded portion on the inner surface of the opening of the front cover 141 and a threaded portion on the outer surface of the lens moving stage 143. The lens moving stage 143 has a first abutment portion 150a that abuts against the flange portion 121a of the lens unit.

[0025] The coil spring 134 is an elastic member disposed between the front cover 141 and the lens holder 131. The coil spring 134 biases the imaging unit toward the imaging element, that is, toward the imaging surface of the imaging element (downward in FIG. 1). Specifically, the coil spring 134 biases the lens holder 131 toward the imaging surface of the imaging element. The purpose of disposing the coil spring 134 is to prevent the screw-mounted lens unit from loosening and to bias the imaging unit toward the imaging surface of the imaging element (downward in FIG. 1). The biasing force (elastic force) of the coil spring 134 causes the flange portion 121a of the standard lens unit 121 (or the super-wide-angle lens unit 122) to abut against the first abutment portion 150a of the lens moving stage 143, thereby determining the position of the imaging unit. In addition, the position of the imaging unit can be moved by moving the lens moving stage 143 relative to the front cover 141.

[0026] The tilt unit is composed of an imaging unit, a front cover 141, a rear cover 144, etc. The tilt unit can change the imaging direction of the lens unit inside the dome cover 111. By changing the imaging direction, the imaging optical axis X shown in Fig. 1 and Fig. 2 also changes.

[0027] The screw 136 is a fastening part for fixing the position of the lens movement stage 143 to the front cover 141. Fastening the screw 136 prevents the lens movement stage 143 and the lens unit from rotating simultaneously when the lens unit is rotated after the position of the lens movement stage 143 is adjusted. The screw 136 also functions as a restricting member for restricting the movement of the lens movement stage 143.

[0028] The lens protection part 142 is detachably attached to the front cover 141 as described above. The lens protection part 142 is arranged so as to surround the lens unit. Specifically, the lens protection part 142 is arranged so as to surround the side surface of the flange part 121a of the lens unit. The lens protection part 142 may have a part cut out near a diagonal part, like a petal-shaped lens hood. Here, when the standard lens unit 121 is held by the lens holder 131, the arrangement position of the lens protection part 142 is outside the angle of view θ1 of the standard lens unit 121 (outside the range of the angle of view θ1). That is, when the lens protection part 142 is attached to the front cover 141 in the case of using the standard lens unit 121, the lens protection part 142 is positioned outside the angle of view of the standard lens unit 121. Therefore, when the lens holder 131 holds the standard lens unit 121, it is possible to use the lens protection part 142 while it is attached to the front cover 141 (without removing it).

[0029] On the other hand, when the lens holder 131 holds the ultra-wide-angle lens unit 122, a part of the lens protection part 142 is positioned within the angle of view of the ultra-wide-angle lens unit 122 (within the range of the angle of view θ2). That is, when the lens protection part 142 is attached to the front cover 141 in the case of using the ultra-wide-angle lens unit 122, a part of the lens protection part 142 is positioned within the angle of view of the standard lens unit 121. Therefore, when the lens holder 131 holds the ultra-wide-angle lens unit 122, the lens protection part 142 is removed for use. In this way, the lens protection part 142 of the first embodiment can be attached and detached according to the angle of view of the lens unit.

[0030] When lens protection part 142 is attached to front cover 141, lens protection part 142 protrudes in the direction toward the subject side (upward in FIG. 1) beyond standard lens unit 121. With this configuration, for example, if dome cover 111 is deformed due to receiving some kind of impact, dome cover 111 comes into contact with lens protection part 142 before standard lens unit 121. This can improve impact resistance.

[0031] Next, a case where the standard lens unit 121 is replaced with the super wide-angle lens unit 122 will be described. First, the lens protection part 142 is removed from the front cover 141. Next, the standard lens unit 121 is removed from the lens holder 131. Next, the lens movement base 143 is attached to the front cover 141. At this time, the lens movement base 143 is attached so as to be positioned in the direction of the imaging surface side of the imaging element (downward in FIG. 1) than when the standard lens unit 121 was used. Thereafter, the super wide-angle lens unit 122 is attached to the lens holder 131.

[0032] In this way, when using the ultra-wide-angle lens unit 122, the lens protection part 142 is removed, and thus there is a risk that the impact resistance performance will decrease by the amount supported by the lens protection part 142. Therefore, in this embodiment, when the ultra-wide-angle lens unit 122 is held by the lens holder 131, the position of the lens movement base 143 is moved in the direction toward the imaging surface side of the imaging element (downward in FIG. 1) with respect to the front cover 141. Specifically, by moving from position A to position B shown in FIG. 1, the distance between the dome cover 111 and the ultra-wide-angle lens unit 122 can be made longer than when the standard lens unit 121 is used.

[0033] In this manner, lens moving stage 143 in this embodiment determines the position of the lens unit such that the lens unit is disposed farther from dome cover 111 when ultra-wide-angle lens unit 122 is attached to lens holder 131. That is, lens moving stage 143 can determine the position of the lens unit in the optical axis direction according to the angle of view of the lens unit. This makes it possible to improve impact resistance even when ultra-wide-angle lens unit 122 is used.

[0034] As described above, according to the configuration of dome camera 100 in embodiment 1, it is possible to improve impact resistance regardless of whether standard lens unit 121 or ultra-wide-angle lens unit 122 is used. This makes it possible to provide a dome-type surveillance camera that has high impact performance regardless of the angle of view of the lens unit without affecting image capture.

[0035] <Embodiment 2> Next, the second embodiment will be described below with reference to Fig. 3. Fig. 3 is an example of a cross-sectional view of a dome camera 200 in the second embodiment. Note that a description of the same configuration of the dome camera 200 in the second embodiment as that of the dome camera 100 in the first embodiment will be omitted, and only differences and configurations from the first embodiment will be described.

[0036] In the second embodiment, a spacer 151 is disposed between the standard lens unit 121 and the front cover 141 .

[0037] Spacer 151 is detachably attached to front cover 141. For example, spacer 151 is attached to front cover 141 with a removable adhesive member (for example, double-sided tape, adhesive, etc.). In embodiment 2, spacer 151 also functions as a lens positioning member that determines the position of the lens unit (lens unit position).

[0038] In the second embodiment, the spacer 151 has a first abutment portion 150a that abuts against the flange portion 121a of the lens unit. Furthermore, the spacer 151 has a third abutment portion 150c that abuts against the second abutment portion 150b of the front cover 141. The front cover 141 has a second abutment portion 150b that abuts against the third abutment portion 150c of the spacer 151. Then, due to the biasing force of the coil spring 134, the flange portion 121a of the lens unit and the first abutment portion 150a of the spacer 151 abut against each other, and the third abutment portion 150c of the spacer 151 abuts against the second abutment portion 150b of the front cover 141. That is, the flange portion 121a of the lens unit and the second abutment portion 150b of the front cover 141 abut against the spacer 151. This allows the position of the imaging unit to be determined in the same manner as in the first embodiment.

[0039] Here, as in embodiment 1, when the standard lens unit 121 is held by the lens holder 131, the position of the lens protection part 142 is outside the angle of view θ1 of the standard lens unit 121, and therefore can remain attached to the front cover 141.

[0040] On the other hand, when the ultra-wide-angle lens unit 122 is held by the lens holder 131, as in the first embodiment, when the lens protection part 142 is arranged, a part of it is within the angle of view θ2 of the ultra-wide-angle lens unit 122. Therefore, when the lens holder 131 holds the ultra-wide-angle lens unit 122, the lens protection part 142 is removed from the front cover 141. Furthermore, the spacer 151 is also removed from the front cover 141. In this way, the spacer 151 of the second embodiment can be attached and detached depending on the angle of view of the lens unit.

[0041] By removing spacer 151 as well, the distance between dome cover 111 and ultra-wide-angle lens unit 122 can be made longer than when standard lens unit 121 is used, as in the first embodiment. That is, spacer 151, which functions as a positioning member, can determine the position of the lens unit in the optical axis direction according to the angle of view of the lens unit, as in the first embodiment. This makes it possible to improve impact resistance even when ultra-wide-angle lens unit 122 is used as in the first embodiment.

[0042] As described above, according to the structure of dome camera 200 of embodiment 2, impact resistance can be improved regardless of whether standard lens unit 121 or ultra-wide-angle lens unit 122 is used, as in embodiment 1. This makes it possible to provide a dome-type surveillance camera that has high impact resistance regardless of the angle of view of the lens unit, without affecting image capture.

[0043] <Embodiment 3> Next, the third embodiment will be described below with reference to Fig. 4. Fig. 4 is an example of a cross-sectional view of a dome camera 300 in the third embodiment. Note that a description of the same configuration as the dome camera 100 in the first embodiment and the dome camera 200 in the second embodiment in the dome camera 300 in the third embodiment will be omitted, and only differences and configurations from the first and second embodiments will be described.

[0044] The lens protection part 161 in the third embodiment is an integrated combination of the lens protection part 142 and the spacer 151 in the second embodiment. That is, the lens protection part 161 has both the function of the lens protection part 142 in the first and second embodiments and the function of the spacer 151 in the second embodiment. The lens protection part 161 is disposed so as to surround the periphery of the flange part 121a of the lens unit (the side surface of the flange part 121a) and at least a part of the surface of the flange part 121a on the imaging surface side of the imaging element (the surface below the flange part 121a in FIG. 4).

[0045] The lens protection part 161 is detachably attached to the front cover 141. For example, it is attached to the front cover 141 with a removable adhesive member (for example, double-sided tape, adhesive, etc.). In the third embodiment, the lens protection part 161 functions as a lens positioning member that determines the position of the lens unit (lens unit position).

[0046] In the third embodiment, the lens protection part 161 has a first abutment part 150a that abuts against the flange part 121a of the lens unit. Furthermore, the lens protection part 161 has a third abutment part 150c that abuts against the second abutment part 150b of the front cover 141. The front cover 141 has a second abutment part 150b that abuts against the third abutment part 150c of the lens protection part 161. Then, due to the biasing force of the coil spring 134, the flange part 121a of the lens unit abuts against the first abutment part 150a of the lens protection part 161, and the third abutment part 150c of the lens protection part 161 abuts against the second abutment part 150b of the front cover 141. This allows the position of the imaging unit to be determined in the same manner as in the first embodiment.

[0047] Here, as in embodiment 1, when the standard lens unit 121 is held by the lens holder 131, the position of the lens protection part 161 is outside the angle of view θ1 of the standard lens unit 121, and therefore can remain attached to the front cover 141.

[0048] On the other hand, when the lens holder 131 holds the ultra-wide-angle lens unit 122, part of the lens protection part 161 of the third embodiment is disposed within the angle of view θ2 of the ultra-wide-angle lens unit 122. Therefore, when the lens holder 131 holds the ultra-wide-angle lens unit 122, the lens protection part 161 is removed from the front cover 141. In this way, the lens protection part 161 of the third embodiment can be attached and detached according to the angle of view of the lens unit.

[0049] By removing lens protection part 161 from front cover 141, the distance between dome cover 111 and ultra-wide-angle lens unit 121 can be made longer than when standard lens unit 121 is used, as in the first embodiment. That is, lens protection part 161, which also functions as a positioning member, can determine the position of the optical axis direction of the lens unit according to the angle of view of the lens unit, as in the first and second embodiments. This makes it possible to improve impact resistance even when ultra-wide-angle lens unit 122 is used, as in the first embodiment.

[0050] As described above, according to the structure of the dome camera 300 of the third embodiment, impact resistance can be improved whether the standard lens unit 121 or the ultra-wide-angle lens unit 122 is used, as in the first and second embodiments. This makes it possible to provide a dome-type surveillance camera that has high impact performance regardless of the angle of view of the lens unit, without affecting image capture. Furthermore, in the third embodiment, the target replacement lens units are limited, which is particularly effective when the amount of movement of the contact portion is constant when using the standard lens unit 121 and the ultra-wide-angle lens unit 122, making it easier to perform the lens replacement work.

[0051] Although the preferred embodiments of the present invention have been described above using examples and drawings, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention.

[0052] The disclosure of this embodiment includes the following configuration.

[0053] (Configuration 1) Dome cover and Housing and a lens unit that is replaceable and has a flange portion on one side in the optical axis direction of the lens; a lens holder that holds the other side of the lens unit in the optical axis direction; and a lens protection member that is detachable from the housing and that is disposed so as to surround the flange portion of the lens unit; a positioning member that determines a position of the lens unit in the optical axis direction in accordance with an angle of view of the lens unit; having the positioning member determines a position of the lens unit such that the lens unit is disposed farther from the dome cover when a second lens unit having a larger angle of view than the first lens unit is attached to the lens holder than when a first lens unit is attached to the lens holder; An imaging device comprising:

[0054] (Configuration 2) The lens holder further includes an elastic member disposed between the housing and the lens holder. 2. The imaging device according to claim 1, wherein the elastic member biases the lens holder toward the imaging element.

[0055] (Configuration 3) The imaging device described in configuration 1 or 2, characterized in that the positioning member is movably positioned relative to the housing by engagement between a threaded portion on the inner surface of a through hole provided in the housing and a threaded portion on the outer surface of the positioning member.

[0056] (Configuration 4) The positioning member is provided with a first contact portion, 3. The imaging device according to configuration 2, wherein the flange portion of the lens unit and the first contact portion of the positioning member are brought into contact with each other by the biasing force of the elastic member.

[0057] (Configuration 5) 5. The imaging device according to any one of configurations 1 to 4, further comprising a restricting member that restricts movement of the positioning member.

[0058] (Configuration 6) 6. The imaging device according to any one of configurations 1 to 5, wherein the positioning member is configured to be detachable from the housing.

[0059] (Configuration 7) the positioning member is disposed between the flange portion and the housing, 3. The imaging device according to configuration 2, wherein the flange portion of the lens unit and a second abutment portion provided on the housing abut against the positioning member due to the biasing force of the elastic member.

[0060] (Configuration 8) 2. The imaging device according to claim 1, wherein the lens protection member and the positioning member are integrally formed.

[0061] (Configuration 9) 9. The imaging device according to any one of configurations 1 to 8, wherein the lens protection member is detachable from the housing in accordance with an angle of view of the lens unit.

[0062] (Configuration 10) the lens protection member is disposed outside the range of a predetermined angle of view θ1 of the first lens unit, 10. The imaging device according to configuration 9, wherein when the first lens unit is held by the lens holder, the lens protection member is not removed from the housing.

[0063] (Configuration 11) The imaging device described in configuration 9 or 10, characterized in that when the second lens unit having an angle of view θ2 that is larger than a predetermined angle of view θ1 is held by the lens holder, the lens protection member is removed from the housing.

[0064] (Configuration 12) 12. The imaging device according to any one of configurations 9 to 11, wherein when the second lens unit is held by the lens holder, the positioning member and the lens protection member are removed from the housing.

[0065] (Configuration 13) 13. The imaging device according to any one of configurations 1 to 12, further comprising an imaging element supported by the lens holder. [Explanation of symbols]

[0066] 111 Dome cover 121 Standard lens unit 122 Ultra-wide-angle lens unit 131 Lens holder 132 Sensors 133 Sensor Board 134 Coil Spring 135 Screw 136 Screw 141 Front cover 142 Lens protection part 143 Lens moving stand 144 Rear cover

Claims

1. Dome cover and Housing and a lens unit that is replaceable and has a flange portion on one side in the optical axis direction of the lens; a lens holder that holds the other side of the lens unit in the optical axis direction; and a lens protection member that is detachable from the housing and that is disposed so as to surround the flange portion of the lens unit; a positioning member that determines a position of the lens unit in the optical axis direction in accordance with an angle of view of the lens unit; having the positioning member determines a position of the lens unit such that the lens unit is disposed farther from the dome cover when a second lens unit having a larger angle of view than the first lens unit is attached to the lens holder than when a first lens unit is attached to the lens holder; An imaging device comprising:

2. The lens holder further includes an elastic member disposed between the housing and the lens holder.

2. The image pickup apparatus according to claim 1, wherein the elastic member biases the lens holder toward an image pickup element.

3. 2. The imaging device according to claim 1, wherein the positioning member is movably disposed relative to the housing by engagement between a threaded portion on an inner surface of a through hole provided in the housing and a threaded portion on an outer surface of the positioning member.

4. The positioning member is provided with a first contact portion, 3. The imaging device according to claim 2, wherein the flange portion of the lens unit and the first contact portion of the positioning member are brought into contact with each other by the biasing force of the elastic member.

5. 2. The imaging apparatus according to claim 1, further comprising a restricting member for restricting movement of the positioning member.

6. The imaging device according to claim 1 , wherein the positioning member is configured to be detachable from the housing.

7. the positioning member is disposed between the flange portion and the housing, 3. The imaging device according to claim 2, wherein the flange portion of the lens unit and a second abutment portion provided on the housing abut against the positioning member due to the biasing force of the elastic member.

8. 2. The imaging device according to claim 1, wherein the lens protection member and the positioning member are integrally formed.

9. 2. The imaging device according to claim 1, wherein the lens protection member is detachable from the housing in accordance with an angle of view of the lens unit.

10. the lens protection member is disposed outside the range of a predetermined angle of view θ1 of the first lens unit, The imaging device according to claim 9 , wherein the lens protection member is not removed from the housing when the first lens unit is held by the lens holder.

11. The imaging device according to claim 9 , wherein when the second lens unit having an angle of view θ2 larger than a predetermined angle of view θ1 is held by the lens holder, the lens protection member is removed from the housing.

12. The imaging device according to claim 9 , wherein when the second lens unit is held by the lens holder, the positioning member and the lens protection member are removed from the housing.

13. The imaging device according to claim 1 , further comprising an imaging element supported by the lens holder.

Images