JP2012090723A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device having not only a forward visual field but also a lateral visual field and being advantageous for illuminating not only the forward visual field but also the lateral visual field.SOLUTION: A primary mirror 2 and a secondary mirror 3 are arranged in such a way that incident light 16a passed through a transparent cover 4 and reflected by, in the order of, a first reflection surface 6 and a second reflection surface 8 enters a first opening 5 and that incident light 15a passed through a lens 9 enters the first opening 5. An imaging section 11 is arranged to receive the incident light 16a and 15a entering the first opening 5. The transparent cover 4 forms an incident surface 4a to which light from a light source 20 enters and an exit surface 4b from which light entered from the incident surface 4a goes out. A third reflection surface 25 that reflects light from the light source 20 to the outside of the transparent cover 4 is formed on at least one side surface of the primary mirror 2 and the secondary mirror 3.

Description

  The present invention relates to an imaging apparatus that has a side view in addition to a front view and can illuminate both views.

  Imaging devices are used in various fields, and one example is an endoscope. Conventional endoscopes include medical endoscopes used for in-vivo examinations and treatments, and industrial endoscopes used for examinations in pipes and the like. Various types of endoscopes that have a light source and can be observed while illuminating a dark space have been proposed. For example, Patent Document 1 below proposes an endoscope that can illuminate at low cost without increasing the outer diameter by arranging a light source using the space behind the imaging means. Yes. Japanese Patent Application Laid-Open No. 2005-228561 discloses an endoscope that can arrange a sufficient number of LEDs in a limited space on a mounting base, and can achieve both a reduction in size of LED lighting means and a sufficient amount of light. Proposed.

JP 2004-29235 A JP 2005-253653 A

  However, the endoscopes described in Patent Documents 1 and 2 are for observing only the front side and not for observing the side direction. For this reason, the light sources provided in these endoscopes are also premised on illuminating the front, and Patent Documents 1 and 2 make special proposals regarding illumination for observing the lateral direction. It wasn't.

  The present invention is to solve the above-described conventional problems, and provides an imaging device that has a side field in addition to a front field of view and is advantageous not only for front field illumination but also for side field illumination. The purpose is to do.

  In order to achieve the above object, an imaging apparatus of the present invention has a first mirror having a first opening in the center, a first reflecting surface formed thereon, a second opening in the center, and a second opening. A secondary mirror formed with a reflective surface, a lens provided at the position of the second opening, a transparent cover that supports the primary mirror and the secondary mirror, and an image pickup disposed on the optical axis of the lens And a light source. The primary mirror and the secondary mirror are configured such that after the incident light transmitted through the transparent cover is reflected in the order of the first reflective surface and the second reflective surface, The incident light that is incident on the first aperture and is transmitted through the lens is disposed so as to be incident on the first aperture, and the imaging unit receives the incident light that is incident on the first aperture. The transparent cover has an incident surface on which light from the light source is incident and an incident surface from the incident surface. A light emission surface is formed, and a third reflection surface that reflects light from the light source toward the outside of the transparent cover is formed on at least one side surface of the primary mirror and the secondary mirror. It is characterized by being.

  According to this configuration, since the incident light that has passed through the transparent cover and the incident light that has passed through the lens are received by the imaging unit, the image of the front field of view and the image of the side field of view are simultaneously captured on one screen. Become. Further, the incident light that has entered the transparent cover is guided through the transparent cover and emitted from the exit surface, thereby enabling the front illumination of the imaging apparatus. On the other hand, since the third reflection surface that reflects the light from the light source toward the outside of the transparent cover is formed, the side illumination of the imaging device can be performed.

  In this configuration, since the light for one light source can be used for both the front illumination and the side illumination, it is not necessary to add a dedicated light source for the side illumination. Moreover, since the 3rd reflective surface which enables side illumination is formed in the at least one side surface of a primary mirror and a submirror, the exclusive reflective surface for side illumination is added as another member. There is no need to do it. Therefore, according to the imaging apparatus of the present invention, it is possible to illuminate both the front field of view and the side field of view while having a simple configuration.

  In the imaging device of the present invention, the third reflecting surface may be a surface parallel to the optical axis of the lens. According to this configuration, it is easy to process the third reflecting surface.

  The third reflecting surface may be an inclined surface inclined with respect to the optical axis of the lens. This configuration is advantageous for securing the amount of reflected light. In addition, since the illumination range changes according to the inclination angle of the inclined surface, it becomes possible to illuminate a necessary range by setting the inclination angle.

  The third reflecting surface may be a spherical surface or an aspherical surface. This configuration is also advantageous in securing the amount of reflected light. In addition, since the illumination range changes according to the setting of the spherical or aspherical shape, it is possible to illuminate the necessary range by setting the shape of the reflecting surface.

  The third reflecting surface may be formed so as to reflect light from the light source by at least one of specular reflection and diffuse reflection. According to this configuration, the reflection effect of the third reflecting surface can be enhanced.

  The transparent cover is formed with a thin-walled portion in which the diameter of the inner peripheral portion is increased while maintaining the diameter of the outer peripheral portion, and the light source is disposed between the thin-walled portion and the side surface of the primary mirror. It is preferable. According to this configuration, an incident surface facing the light source is formed on the transparent cover, which is advantageous for securing incident light in the transparent cover, and the thin portion is also used as a protection member for the light source. It can be reduced and manufacturing becomes easy. In addition, the thin portion contributes to securing the light source storage space, and it is possible to secure the light source storage space without increasing the outer diameter of the transparent cover.

  It is preferable that the primary mirror has a reduced diameter portion whose diameter is smaller than that of the first reflective surface forming portion, and the light source is disposed between the transparent cover and the reduced diameter portion. . Also with this configuration, it is possible to secure a storage space for the light source without increasing the outer diameter of the transparent cover.

  According to the present invention, the image of the front view and the image of the side view can be simultaneously imaged on one screen, and the front illumination of the image pickup apparatus can be performed by the light guided through the transparent cover. The side illumination of the imaging device can be performed by the light reflected by the reflecting surface. In addition, it is not necessary to add a dedicated light source for side lighting, and it is not necessary to add a dedicated reflecting surface for side lighting as a separate member, while having a simple configuration. Both front view and side view illumination are possible.

The perspective view which shows the inside of the endoscope which concerns on Embodiment 1 of this invention. 1 is a longitudinal sectional view of an endoscope according to Embodiment 1 of the present invention. 1 is a cross-sectional view of an endoscope according to Embodiment 1 of the present invention. The longitudinal cross-sectional view of the endoscope which concerns on Embodiment 2 of this invention. The longitudinal cross-sectional view of the endoscope which concerns on Embodiment 3 of this invention. The longitudinal cross-sectional view of the endoscope which concerns on Embodiment 4 of this invention.

  Hereinafter, an imaging apparatus according to an embodiment of the present invention will be described with reference to the drawings. In each of the following embodiments, an example in which the imaging device is an endoscope will be described.

(Embodiment 1)
FIG. 1 is a perspective view showing the inside of an endoscope 1 according to Embodiment 1 of the present invention. In FIG. 1, the cylindrical transparent cover 4 is illustrated in a cross-sectional state. FIG. 2 is a longitudinal sectional view of the endoscope 1 shown in FIG. 1 and 2, the endoscope 1 includes a primary mirror 2 and a secondary mirror 3, and the primary mirror 2 and the secondary mirror 3 are arranged to face each other with a space 12 therebetween. The outer periphery of the primary mirror 2 and the secondary mirror 3 is surrounded by a cylindrical transparent cover 4, and the outer peripheral surfaces of the primary mirror 2 and the secondary mirror 3 are fitted to the inner peripheral surface of the transparent cover 4. Thus, the primary mirror 2 and the secondary mirror 3 are supported by the transparent cover 4. The material of the transparent cover 4 is, for example, acrylic or glass.

  The primary mirror 2 has a first opening 5 in the center, and a first reflecting surface 6 is formed. The secondary mirror 3 has a second opening 7 in the center, and a second reflecting surface 8 is formed. A lens 9 is provided at the position of the second opening 7. On the optical axis 10 of the lens 9, the center of the first opening 5 and the center of the second opening 7 are arranged. The first reflecting surface 6 and the second reflecting surface 8 are both rotationally symmetric reflecting surfaces around the optical axis 10.

  The endoscope 1 has a front visual field 15 and a side visual field 16 and can capture an image in each visual field. The light in the front visual field 15 passes through the lens 9 and enters the space 12. In FIG. 2, the front visual field 15 is shown only on one side of the optical axis 10, but light enters the space 12 from the entire circumference surrounding the optical axis 10.

  The light in the side visual field 16 passes through the transparent cover 4 and enters the space 12. In FIG. 2, the side visual field 15 is shown only on one side of the optical axis 10, but light enters the space 12 from the entire circumference of the side surface of the cylindrical transparent cover 4. Light that has entered the space 12 from the front visual field 15 and the side visual field 16 is received by the imaging unit 11, and images of the front visual field 15 and the side visual field 16 are captured. The imaging unit 11 is a CCD camera, for example. Hereinafter, the imaging by the endoscope 1 will be specifically described.

  In FIG. 2, incident light 16 a is a part of incident light that passes through the transparent cover 4 from the side field 16. Incident light 16 a is reflected by the first reflecting surface 6, subsequently reflected by the second reflecting surface 8, and then received by the imaging unit 11 through the first opening 5. Similarly to this, incident light of the entire range of the side field of view 16 is received by the imaging unit 11 over the entire circumference of the transparent cover 4. As a result, an image of the side visual field 16 is captured over the entire side of the endoscope 1.

  On the other hand, in FIG. 2, incident light 15 a is a part of incident light transmitted through the lens 9 from the front visual field 15. Incident light 15 a that has entered the space 12 is received by the imaging unit 11 through the first opening 5. In the same manner, incident light in the entire range of the front visual field 15 is received by the imaging unit 11 over the entire circumference around the optical axis 10. As a result, the image of the front visual field 15 is captured over the entire circumference around the optical axis 10.

  Therefore, according to the endoscope 1 according to the present embodiment, the image of the front visual field 15 and the image of the side visual field 16 are simultaneously captured on one screen. Further, as described above, since the image of the lateral field of view 16 over the entire circumference of the transparent cover 4 can be imaged, the image over the entire circumference of the side surface is imaged at a time just by inserting the endoscope 1 into the inspection position. Time can be shortened.

  Here, the endoscope 1 is mainly used for imaging in a dark space. Illumination is necessary to facilitate imaging in dark spaces. In the present embodiment, not only the front visual field 15 but also the side visual field 16 can be illuminated with a simple configuration and without increasing the outer shape. This will be specifically described below.

  1 and 2, a light source 20 is disposed so as to be adjacent to the primary mirror 2. The light source 20 is, for example, an LED. An incident surface 4a is formed on the primary mirror 2 side of the transparent cover 4, and an exit surface 4b is formed on the secondary mirror 3 side. Light from the light source 20 enters the transparent cover 4 from the incident surface 4a. The light that has entered the transparent cover 4 is guided in the transparent cover 4 and emitted from the exit surface 4b, enabling front illumination.

  In FIG. 2, incident light 21 is incident light incident on the incident surface 4 a of the transparent cover 4 from the light source 20. The incident light 21 is totally reflected by the outer peripheral surface 4c of the transparent cover 4, is guided toward the exit surface 4b, and exits from the exit surface 4b. The incident angle θ is an incident angle of the incident light 21 on the outer peripheral surface 4 c of the transparent cover 4. If the incident angle θ is equal to or greater than a predetermined angle, total reflection occurs, and the incident light 21 is totally reflected by the outer peripheral surface 4c as shown in FIG. 2 without being transmitted through the outer peripheral surface 4c of the transparent cover 4. .

  When the material of the transparent cover 4 is acrylic, total reflection occurs when the angle θ is 42 degrees or more. In FIG. 2, the number of total reflections of the incident light 21 in the transparent cover 4 is only one on the outer peripheral surface 4 c, but the outer peripheral surface 4 c and the inner peripheral surface of the transparent cover 4 are incident light having a small incident angle θ. Some of them are totally reflected by both 4d and emitted from the exit surface 4b.

  Since light is emitted from the light source 20 at a predetermined spread angle, the incident angle θ varies depending on the emission angle from the light source 20 in the transparent cover 4. For this reason, each incident light that has entered the transparent cover 4 has a different total reflection angle depending on an emission angle from the light source 20, and an emission angle from the emission surface 4b. Therefore, the light guided through the transparent cover 4 is emitted from the emission surface 4b at a predetermined spread angle, and the object in the front visual field 15 can be illuminated.

  On the other hand, part of the light emitted from the light source 20 is reflected by the reflecting surface 25 formed on the side surface of the main mirror 2 before entering the transparent cover 4, thereby enabling side illumination. The reflected light 26 in FIG. 2 is reflected light reflected by the reflecting surface 25. The reflected light 26 passes through the transparent cover 4 and is emitted to the outside of the transparent cover 4. Since light is emitted from the light source 20 at a predetermined spread angle, the reflection angle of the reflected light 26 on the reflection surface 25 differs depending on the emission angle of the light source 20. For this reason, light is emitted toward the outside of the transparent cover 4 at a predetermined spread angle, and the object in the side visual field 16 can be illuminated.

  In FIG. 2, for convenience of explanation, the light emitted from the right light source 20 performs front illumination, and the light emitted from the left light source 20 performs side illumination, but each of the light sources 20 Both front illumination and side illumination are performed. That is, the light emitted from each light source 20 is divided into one used for front illumination and one used for side illumination according to the emission angle.

  In order to enhance the effect of side illumination by side reflection of the main mirror 2, it is preferable to mirror the side surface 25 of the main mirror 2. For example, the material of the main mirror 2 may be an aluminum alloy, and the mirror surface processing may be performed by cutting or polishing the side surface 25. Alternatively, a rough surface may be formed on the side surface 25 of the primary mirror 2 so that the light from the light source 20 is diffusely reflected on the side surface 25 of the primary mirror 2. Whether the reflecting surface is a mirror reflecting surface or a diffuse reflecting surface may be determined according to the characteristics of the inspection.

  As described above, according to the present embodiment, each light source 20 is used not only for the front illumination of the endoscope 1 but also for the side illumination. For this reason, in this embodiment, a dedicated light source is not required for side illumination. Further, since the side surface of the primary mirror 2 also serves as the reflecting surface 25, it is not necessary to add a dedicated reflecting surface for side illumination as a separate member. Therefore, according to the endoscope 1 according to the present embodiment, both the front illumination and the side illumination can be performed without increasing the number of parts and with a simple configuration. As shown in FIG. 2, the reflecting surface 25 is a surface parallel to the optical axis 10 of the lens 9. According to this configuration, the processing of the reflecting surface 25 is facilitated.

  In the endoscope 1 according to the present embodiment, increasing the number of the light sources 20 is advantageous for both the front illumination and the side illumination. FIG. 3 is a cross-sectional view of the endoscope 1 showing an example of the arrangement of the light sources 20. In the example of FIG. 3, six light sources 20 are arranged in the circumferential direction of the transparent cover 4 at an angle α of 60 degrees. By arranging the light source 20 over the entire circumference of the transparent cover 4 in this way, a wide range of illumination is possible in both the front illumination and the side illumination.

  The arrangement and the number of the light sources 20 are not limited to the example of FIG. 3, and may be determined as appropriate according to the necessary illumination range. As described above, since each light source 20 performs forward illumination and side illumination, forward illumination and side illumination are possible even when the number of the light sources 20 is one.

  In the present embodiment, the light source 20 is added without increasing the outer diameter of the endoscope 1. Specifically, in FIG. 2, the transparent cover 4 forms a thin portion 4e in which the diameter of the inner peripheral portion is increased while maintaining the diameter of the outer peripheral portion. As a result, an incident surface 4 a facing the light source 20 is formed, which is advantageous for securing incident light into the transparent cover 4. The incident surface 4 a is formed not on the end surface of the transparent cover 4 but on the inner side of the transparent cover 4, and the thin portion 4 e is also used as a protective member for the light source 20. Compared with the configuration in which the end surface of the transparent cover 4 is the entrance surface, this configuration eliminates the need to add a protective member for the light source 20 separately from the transparent cover 4, reduces the number of components, and facilitates manufacture. Further, the thin portion 4e contributes to securing the storage space for the light source 20 as described below.

  In FIG. 2, the primary mirror 2 forms a reduced diameter portion 2 a having a smaller diameter than the formation portion of the first reflecting surface 6. The light source 20 is disposed between the thin portion 4e and the reduced diameter portion 2a. According to this configuration, a storage space for the light source 20 can be secured between the thin portion 4e and the reduced diameter portion 2a without increasing the outer diameter of the transparent cover 4.

  In the example of FIG. 2, both the thin portion 4e and the reduced diameter portion 2 are formed. However, even if only one of them is formed, it is advantageous for securing a storage space for the light source 20. For example, depending on the size of the light source 20, there is a possibility that the light source 20 can be accommodated even when only the thin portion 4e is formed without forming the reduced diameter portion 2a. When the thin portion 4 e is not formed, the transparent cover 4 does not have the incident surface 4 a that faces the light source 20, but the light emitted from the light source 20 can be incident from the inner peripheral surface of the transparent cover 4.

(Embodiment 2)
FIG. 4 shows a longitudinal sectional view of an endoscope 1a according to Embodiment 2 of the present invention. Similarly to the endoscope 1 of the first embodiment, the endoscope 1a can simultaneously capture the image of the front visual field 15 and the image of the side visual field 16 on one screen, and both the front illumination and the side illumination can be obtained. Is possible. In FIG. 4, parts having the same configurations as those of the endoscope 1 shown in FIGS.

  The endoscope 1a shown in this figure is different from the endoscope 1 shown in FIGS. 1 and 2 in that a reflecting surface 27 that is an inclined surface is formed on the main mirror 2. The reflecting surface 27 is inclined with respect to the optical axis 10 of the lens 9 and is formed on the entire circumference of the side surface of the main mirror 2. A part of the light emitted from the light source 20 is reflected by the reflecting surface 27. The reflected light 30 in FIG. 4 is reflected light reflected by the reflecting surface 27. The reflected light 30 passes through the transparent cover 4 and is emitted to the outside of the transparent cover 4.

  Since light is emitted from the light source 20 at a predetermined spread angle, the reflection angle of the reflected light 30 on the reflection surface 27 differs depending on the emission angle of the light source 20. For this reason, light is emitted toward the outside of the transparent cover 4 at a predetermined spread angle, and the object in the side visual field 16 can be illuminated. This is the same as in the case of reflection by the reflecting surface 25 of the first embodiment. Moreover, the point which should just make the reflective surface 27 a mirror surface process or a rough surface process, and to improve the effect of side irradiation is the same as that of the case of the reflection by the reflective surface 25 of Embodiment 1. FIG.

  By using the reflecting surface 27 as an inclined surface as in the present embodiment, it is possible to ensure the amount of reflected light even when a sufficient amount of reflected light cannot be obtained on a surface parallel to the optical axis 10. In addition, since the illumination range changes according to the inclination angle of the reflection surface 27, it is possible to illuminate a necessary range by setting the inclination angle of the reflection surface 27.

  In the configuration of FIG. 4, the reflection surface 25 is formed in addition to the reflection surface 27 as in the first embodiment. According to this configuration, it is advantageous for securing the amount of reflected light to the side, and also advantageous for expanding the illumination range on the side. Further, the formation range of the reflection surface 27 may be enlarged, or the tilt angle may be partially changed to secure the amount of reflected light and to enlarge the illumination range.

  In FIG. 4, the contact portion of the primary mirror 2 with the inner peripheral surface of the transparent cover 4 may be an upright surface parallel to the optical axis 10 of the lens 9 so that the surfaces come into contact with each other. As a result, the fixing of the primary mirror 2 is stabilized without any special processing on the inner peripheral surface of the transparent cover 4.

(Embodiment 3)
FIG. 5 shows a longitudinal sectional view of an endoscope 1b according to Embodiment 3 of the present invention. Similarly to the endoscope 1 of the first embodiment, the endoscope 1b can simultaneously capture the image of the front visual field 15 and the image of the side visual field 16 on one screen, and both the front illumination and the side illumination can be captured. Is possible. In FIG. 5, parts having the same configuration as the endoscope 1 shown in FIGS.

  The endoscope 1b shown in FIG. 5 is different from the endoscope 1 shown in FIGS. 1 and 2 in that a reflecting surface 31 is formed on the secondary mirror 3. In the example of FIG. 5, the inclined surface formed on a part of the side surface of the secondary mirror 3 is used as the reflecting surface 31. The reflection surface 31 is formed on the entire circumference of the side surface of the secondary mirror 3, and the reflection surface 31 is inclined with respect to the optical axis 10 of the lens 9.

  In FIG. 5, the emitted light 32 from the light source 20 is totally reflected by the outer peripheral surface 4 c of the transparent cover 4 and further reflected by the reflecting surface 31 of the secondary mirror 3. The reflected light 33 reflected by the reflecting surface 31 passes through the transparent cover 4 and is emitted to the outside of the transparent cover 4.

  Since light is emitted from the light source 20 at a predetermined spread angle, the reflection angle of the reflected light 33 on the reflection surface 31 differs depending on the emission angle of the light source 20. For this reason, light is emitted toward the outside of the transparent cover 4 at a predetermined spread angle, and the object in the side visual field 16 can be illuminated. This is the same as in the case of reflection by the reflecting surface 25 of the first embodiment. Moreover, the point which should just make the reflective surface 31 a mirror surface process or a rough surface process, and to improve the effect of side irradiation is the same as that of the case of the reflection by the reflective surface 25 of Embodiment 1. FIG.

  Since the illumination range changes according to the inclination angle of the reflection surface 31, it becomes possible to illuminate a necessary range by setting the inclination angle of the reflection surface 31. The reflecting surface 31 may be a horizontal plane. Further, the range of the reflection surface 31 may be enlarged or the inclination angle may be partially changed to secure the amount of reflected light and to enlarge the illumination range.

  In FIG. 5, the reflective surface 31 is formed on the secondary mirror 3, but the reflective surface may be formed on both the secondary mirror 3 and the primary mirror 2. For example, in FIG. 5, the side surface of the primary mirror 2 may be processed to form a reflective surface from which the reflected light 26 is obtained like the reflective surface 25 shown in FIG. In FIG. 5, an inclined surface such as the reflecting surface 27 shown in FIG. 4 may be formed on the side surface of the primary mirror 2.

(Embodiment 4)
FIG. 6 shows a longitudinal sectional view of an endoscope 1c according to Embodiment 4 of the present invention. The endoscope 1c shown in FIG. 6 has the same configuration as the endoscope 1 shown in FIGS. 1 and 2 except for the shape of the reflecting surface 35. In FIG. 6, parts having the same configuration as the endoscope 1 shown in FIGS.

  In FIG. 2, the reflecting surface 25 is a surface parallel to the optical axis 10, whereas in FIG. 6, the reflecting surface 35 is a spherical surface or an aspherical surface. In FIG. 6, the reflected light 36 reflected by the reflecting surface 35 passes through the transparent cover 4 and is emitted to the outside of the transparent cover 4. In this configuration, the illumination range changes according to the spherical or aspherical shape of the reflecting surface 35, so that the necessary range can be illuminated by setting the spherical or aspherical shape.

  As mentioned above, although Embodiment 1-4 demonstrated with the example of the endoscope, the structure of each said embodiment can be used as a structure of not only an endoscope but various imaging devices. For example, the configuration of each of the above embodiments can be used as a surveillance camera. It can also be used as an in-vehicle camera for confirming the front and rear of a vehicle. Each of the above embodiments has a side field of view in addition to the front field of view and can illuminate both fields of view. Therefore, when used as a surveillance camera, it is possible to detect the approach of a person at night. Similarly, when used as an in-vehicle camera, it is possible to check at night or in a dark place.

  As described above, according to the present invention, in an imaging apparatus having a side field in addition to the front field, it is advantageous not only for the front field illumination but also for the side field illumination. It can be used as a mirror, and more specifically, it is useful as a medical endoscope used for in-vivo inspection and treatment, and an industrial endoscope used for inspection in piping. Moreover, it can be used not only as an endoscope but also as various imaging devices.

1, 1a, 1b, 1c Endoscope 2 Primary mirror 2a Reduced diameter part 3 Sub mirror 4 Transparent cover 4c Thin part 5 First opening 6 First reflecting surface 7 Second opening 8 Second reflecting surface 9 Lens DESCRIPTION OF SYMBOLS 10 Optical axis 11 Imaging part 12 Space 15 Front visual field 15a, 16a, 21, 32 Incident light 16 Side visual field 20 Light source 25, 27, 31, 35 Reflective surface 26, 30, 33, 36 Reflected light

Claims (7)

A primary mirror having a first opening in the center and having a first reflecting surface;
A secondary mirror having a second opening in the center and having a second reflecting surface;
A lens provided at the position of the second opening;
A transparent cover for supporting the primary mirror and the secondary mirror;
An imaging unit disposed on the optical axis of the lens;
A light source,
In the primary mirror and the secondary mirror, incident light transmitted through the transparent cover is reflected in the order of the first reflective surface and the second reflective surface, and then enters the first opening, and the lens. Is disposed so that incident light transmitted through the first aperture is incident on the first opening,
The imaging unit is arranged to receive incident light incident on the first opening,
The transparent cover forms an incident surface on which light from the light source is incident and an emission surface on which light incident from the incident surface is emitted,
An imaging apparatus, wherein a third reflecting surface for reflecting light from the light source toward the outside of the transparent cover is formed on at least one side surface of the primary mirror and the secondary mirror.   The imaging apparatus according to claim 1, wherein the third reflecting surface is a surface parallel to an optical axis of the lens.   The imaging device according to claim 1, wherein the third reflecting surface is an inclined surface inclined with respect to an optical axis of the lens.   The imaging apparatus according to claim 1, wherein the third reflecting surface is a spherical surface or an aspherical surface.   5. The imaging apparatus according to claim 1, wherein the third reflecting surface is formed so as to reflect light from the light source by at least one of specular reflection and diffuse reflection. 6.   The transparent cover is formed with a thin-walled portion in which the diameter of the inner peripheral portion is increased while maintaining the diameter of the outer peripheral portion, and the light source is disposed between the thin-walled portion and the side surface of the primary mirror. The imaging device according to claim 1. 2. The primary mirror has a reduced diameter portion whose diameter is smaller than that of the first reflecting surface forming portion, and the light source is disposed between the transparent cover and the reduced diameter portion. The imaging device according to any one of 6 to 6.

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