JP2012153322A - Rearview mirror type imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rearview mirror type imaging apparatus that simultaneously images the inside and outside of a vehicle with one camera without installing a plurality of cameras.SOLUTION: A mirror body 2 provided in a vehicle V includes: a half mirror 3 which transmits and reflects light beam to a surface facing a driver who drives the vehicle V, of the mirror body 2; a transmission member 4 for transmitting the light beam to a surface opposite the surface on which the half mirror 3 of the mirror body 2 is provided; and an imaging means 5 for imaging the light beam which transmits the half mirror 3 and the transmission member 4 in the mirror body 2.

Description

  The present invention relates to a room mirror type imaging device for imaging a situation inside and outside a vehicle interior.

  As a conventional room mirror type imaging device, one disclosed in Patent Document 1 is known. This room mirror type imaging device is employed as, for example, a drive recorder or a vehicle monitoring camera.

  These are installed on a windshield, a rearview mirror, a ceiling, etc. in a vehicle interior to capture the situation of the vehicle before and after the occurrence of a vehicle accident.

JP 2008-118482 A

  The room mirror type imaging device of Patent Document 1 includes a vehicle interior camera and a vehicle exterior camera in order to simultaneously capture the situation of the vehicle inside and outside the vehicle interior, and is expensive.

  Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide a room mirror type imaging apparatus capable of simultaneously imaging the interior and exterior of a vehicle with a single camera without providing a plurality of cameras. It is what.

  The present invention provides a mirror body provided in a vehicle compartment, a half mirror that transmits and reflects light on a surface of the mirror body that faces the driver of the vehicle, and a surface on which the half mirror of the mirror body is provided. And a imaging member for imaging the light beam that has passed through the half mirror and the transmission member.

  In addition, a first polarizing member that polarizes the light beam transmitted through the half mirror is provided in the half mirror, and a second polarizing member that is polarized at an angle different from the polarization direction of the first polarizing member is provided in the transmitting member. It is.

  Further, the imaging means is an optical made of a solid transparent material having an incident portion for incident the light beam that has passed through the half mirror and the transmission member, and a reflection portion having a rotationally symmetric shape for reflecting the incident light beam. It comprises a member and an image sensor that images the light beam reflected by the reflecting section.

  The optical member includes an elongated hole at the top of the reflecting portion, and at least a part of the hole is covered with a light shielding layer.

  Further, the reflective portion is covered with a reflective layer made of a dielectric material.

  The imaging means is disposed inside the mirror body and images 360 degrees in a range from at least an elevation angle of 10 degrees to a depression angle of 60 degrees.

  According to the present invention, it is possible to provide a room mirror type imaging apparatus capable of achieving the intended purpose and capable of simultaneously imaging the interior and exterior of a vehicle with a single camera without being equipped with a plurality of cameras. .

1 is a schematic view of a vehicle equipped with a room mirror type imaging device according to a first embodiment of the present invention. Sectional drawing of the room mirror type imaging device of the embodiment. Sectional drawing of the imaging device of the embodiment. Sectional drawing of the room mirror type imaging device of 2nd Embodiment of the same invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The room mirror type imaging device 1 of the present invention is provided in the room of the vehicle V so that the driver of the vehicle V can visually recognize the state behind the vehicle. The room mirror type imaging device 1 includes a mirror body 2, a half mirror 3, a transmission member 4, and an imaging unit 5.

  The mirror body 2 is a frame made of a synthetic resin, and is attached to a stay 6 provided in the vehicle V. The mirror body 2 is attached to the stay 6 so as to be movable so that it can be adjusted according to the physique of the driver.

  The half mirror 3 has a flat plate shape and is provided on the surface of the mirror main body 2 facing the driver who drives the vehicle V. The half mirror 3 reflects the state behind the vehicle V to the driver and It penetrates through. That is, the half mirror 3 transmits and reflects light rays.

  In addition, a first polarizing member 7 that polarizes the light beam transmitted through the half mirror 3 is provided on a part of the half mirror 3 on the mirror body 2 side. The first polarizing member 7 has a film shape and is attached to the half mirror 3. The first polarizing member 7 creates linearly polarized light. In this embodiment, the direction of linearly polarized light is the horizontal direction.

  The transmission member 4 has a flat plate shape made of a synthetic resin that transmits light, and the surface of the mirror body 2 opposite to the surface on which the half mirror 3 is provided, that is, the surface of the mirror body 2 facing the front of the vehicle V. And the state in front of the vehicle V is transmitted to the imaging means 5. That is, the transmissive member 4 transmits light.

  Further, a second polarizing member 8 is provided on the mirror body 2 side of the transmissive member 4 to polarize the light beam transmitted through the transmissive member 4. The second polarizing member 8 has a film shape and is attached to the transmissive member 4. The second polarizing member 8 creates linearly polarized light. In the present embodiment, the direction of linearly polarized light is an angle different from the polarization direction of the first polarizing member 7 and is a vertical direction. Since the polarization directions of the first polarizing member 7 and the second polarizing member 8 are different, the light beam transmitted through the transmitting member 4 including the second polarizing member 8 is blocked by the first polarizing member 7, and the half mirror 3 is moved. Not transparent.

  The image pickup means 5 is a camera that is provided inside the mirror body 2 and picks up an image of the surroundings transmitted through the half mirror 3 and the transmission member 4.

  The imaging means 5 includes an optical member 51, a case body 52, an imaging element 53, a circuit board 54, and a reflective layer 55.

  The optical member 51 is made of a solid translucent resin (for example, polycarbonate), and includes an incident portion 56, a reflection portion 57, and a light guide portion 58.

  The incident portion 56 is a portion where the light beam that has passed through the transmissive member 4 and the half mirror 3 enters the optical member 51.

  The reflection portion 57 is a portion that reflects the light beam that has entered the optical member 51 and has a shape obtained by rotating a hyperbola. In addition, the reflective portion 57 is provided with a reflective layer 55. The reflection layer 55 is made of a dielectric material, has wavelength selectivity, and transmits only visible light without transmitting infrared light. In addition, an elongated hole 59 is provided at the top of the reflecting portion 57, and at least a part of the hole 59 is covered with a light shielding layer.

  The light guide unit 58 guides the light beam reflected by the reflective layer 55 to the image sensor 23, and has a substantially cylindrical shape. The light guide 58 has an emission surface 58 a that faces the image sensor 23.

  The imaging means 5 has a field-of-view range S. The field-of-view range S images all directions in which the vertical direction is at least from an elevation angle of 10 degrees to a depression angle of 60 degrees and the horizontal direction is 360 degrees, The light enters the optical member 51 from the incident portion 56, is reflected by the reflective layer 55, and is guided to the image sensor 53 by the light guide portion 58.

  The case body 52 is fixed to the lower end portion of the optical member 51. The image sensor 53 is an image sensor using a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and is mounted on the circuit board 54 and fixed to the case body 52.

  The upper surface of the optical member 51 is covered with a lid 60. The lid 60 is made of a light shielding resin.

  With the configuration as described above, it is possible to provide a room mirror type imaging device capable of simultaneously imaging the interior and exterior of a vehicle with a single camera without providing a plurality of cameras.

  In addition, the room mirror type imaging device 1 of the present invention is not limited to the room mirror that is provided as standard on the vehicle V as in the above embodiment, and as illustrated in FIG. 4, the room mirror type imaging device of the second embodiment. The device 10 may be mounted on a room mirror M that is provided as standard on the vehicle V.

  The room mirror type imaging device 10 according to the second embodiment is substantially the same as the room mirror type imaging device 1 according to the first embodiment. is there. The fixing unit 11 has a hook shape, and fixes the room mirror type imaging apparatus 10 to the room mirror M with the room mirror M sandwiched from above and below.

  The present invention can be used for an imaging device that captures the situation inside and outside the vehicle interior.

DESCRIPTION OF SYMBOLS 1, 10 Room mirror type imaging device 2 Mirror main body 3 Half mirror 4 Transmission member 5 Imaging means 7 1st polarizing member 8 2nd polarizing member 51 Optical member 53 Image pick-up element 55 Reflective layer 56 Incident part 57 Reflective part 59 Hole part S Field of view Range V Vehicle

Claims (6)

A mirror body provided in a vehicle interior, a half mirror that transmits and reflects light on a surface of the mirror body that faces the driver driving the vehicle, and a side opposite to the surface of the mirror body on which the half mirror is provided A room mirror type imaging apparatus comprising: a transmissive member that transmits a light beam on the surface; and an imaging unit that images the light beam transmitted through the half mirror and the transmissive member on the mirror body. A first polarizing member for polarizing the light beam transmitted through the half mirror is provided on the half mirror, and a second polarizing member for polarizing at an angle different from the polarization direction of the first polarizing member is provided on the transmitting member. The room mirror type imaging device according to claim 1. The imaging means includes an optical member made of a solid transparent material having an incident portion for incident the light beam that has passed through the half mirror and the transmission member, and a reflection portion having a rotationally symmetric shape for reflecting the incident light beam. The room mirror type imaging device according to claim 1, further comprising: an imaging device that images the light beam reflected by the reflecting unit. The room mirror type imaging device according to claim 3, wherein the optical member includes an elongated hole at the top of the reflecting portion, and at least a part of the hole is covered with a light shielding layer. The room mirror type imaging device according to claim 3 or 4, wherein the reflection portion is covered with a reflection layer made of a dielectric material. 4. The room mirror type imaging apparatus according to claim 1, wherein the imaging unit is disposed inside the mirror body and images 360 degrees in a range from at least an elevation angle of 10 degrees to a depression angle of 60 degrees. 5.

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