JP4960856B2 - In-vehicle camera device - Google Patents

Description

The present invention relates to a vehicle mounting the camera device.

  In alleys with poor visibility on the left and right sides of the vehicle, it is not possible to visually confirm the safety on the left and right sides of the road ahead from the driver's seat unless the vehicle is slowly stopped and entered the front road surface until it stops. It was. Therefore, in recent years, even in alleys where the front and left sides have poor visibility, both the front sides of the front part of the vehicle body can be easily checked without entering the front road surface up to the vicinity of the driver's seat. An in-vehicle camera device that displays an image of a region on a monitor in a vehicle interior is known.

  In such a vehicle-mounted camera device, a wide-angle camera unit having a wide-angle lens with a wide angle of view (about 130 to 190 degrees) is used to display images of both front side regions of the front part of the vehicle body. It is installed in the center of By the way, since the wide-angle camera unit having such a wide-angle lens generally supports only imaging in the visible light region, it cannot be used in a dark environment such as at night.

For this reason, a camera that is provided with an infrared LED that emits infrared light and can switch the focusing position of the lens in correspondence with the infrared light so that it can be imaged in the same way as in the daytime even in a dark environment such as at night A unit has been proposed (see, for example, Patent Document 1).
JP 2007-93652 A

  By the way, the camera unit as in Patent Document 1 has an infrared LED that emits infrared light or a lens focusing position with visible light and infrared light so that an image can be captured even in a dark environment such as at night. In addition, since these members (infrared LED, switching mechanism) are included, the camera unit becomes large and the cost increases.

Therefore, the present invention can capture images well in daytime and nighttime without using an infrared LED or a switching mechanism that switches the focus position of a lens between visible light and infrared light, and is compact and inexpensive . and to provide a vehicle mounting camera apparatus.

In order to achieve the object, the invention according to claim 1 is a wide-angle lens system configured by arranging a plurality of lenses from the object side to the image plane side, and a subject imaged by the wide-angle lens system. and a solid-state image pickup element for converting into an electric signal by receiving the image receiving surface having a plurality of pixels, a single lens of the plurality of lenses constituting the front Symbol wide-angle lens system or the plurality of lenses, A first transmission means for transmitting light rays having a wavelength in the infrared region in the center of the optical axis of the wide-angle lens system is provided in front of the lens closest to the object side. A second transmitting means for transmitting a light beam having a wavelength in the visible light region is provided on the outer peripheral side of the first transmitting means, and the infrared light is transmitted from the central region on the object side of the wide-angle lens system that has passed through the first transmitting means. The subject image is received by the solid-state image sensor. The light is received on the surface and converted into an electric signal, and the subject image by the visible light in the peripheral area on the object side of the wide-angle lens system that has passed through the second transmission means is received on the light receiving surface of the solid-state imaging device and converted into an electric signal. A wide-angle camera unit for conversion, a signal processing means for processing an electrical signal output from the solid-state image sensor of the wide-angle camera unit arranged at a predetermined position of the vehicle into a displayable image signal, and generated by the signal processing means Display means for displaying the image by inputting the received image signal, illuminance detection means for detecting the illuminance around the vehicle, and based on the illuminance information detected by the illuminance detection means, the surroundings of the vehicle is equal to or greater than the predetermined illuminance Is output from the signal processing means corresponding to the subject image by visible light in the object-side peripheral area of the wide-angle lens system that has passed through the second transmission means. When an image signal is selected and controlled to be displayed on the display means, and it is determined that the surroundings of the vehicle are less than a predetermined illuminance, the infrared of the central area on the object side of the wide-angle lens system that has passed through the first transmission means is characterized in that chromatic and control means for controlling so as to be displayed on said display means by selecting an image signal output from said signal processing means in accordance with the object image by light.

The invention according to claim 2 includes a wide-angle lens system configured by arranging a plurality of lenses from the object side to the image plane side, and a subject image formed by the wide-angle lens system having a plurality of pixels. A solid-state imaging device that receives the light on the light receiving surface and converts it into an electrical signal, and is one of the plurality of lenses constituting the wide-angle lens system or the object on the object side of the plurality of lenses. In front of the object side of the near lens, there is provided first transmission means for transmitting light rays having a wavelength in the infrared light region on the center side with the optical axis of the wide-angle lens system as the center, and concentric circles of the first transmission means. A second transmission unit that transmits light having a wavelength in the visible light region is provided on the outer peripheral side, and an object image by infrared light in the object-side central region of the wide-angle lens system that has passed through the first transmission unit is captured by the solid-state imaging device. Receives light on the light receiving surface and converts it to an electrical signal A wide-angle camera unit that receives a subject image by visible light in the object-side peripheral region of the wide-angle lens system that has passed through the second transmission means, and receives the light on the light-receiving surface of the solid-state imaging device and converts the object image into an electric signal; A signal processing means for processing an electrical signal output from the solid-state image sensor of the wide-angle camera unit arranged at a predetermined position into a displayable image signal, and an image signal generated by the signal processing means Display means for displaying an image, and based on the image signal output from the signal processing means, the display means transmits the first transmission means in an environment where the surroundings of the vehicle have a predetermined illuminance or higher. Displaying an object image by infrared light in an object-side central region of a wide-angle lens system and an object image by visible light in an object-side peripheral region of the wide-angle lens system that has passed through the second transmission means; Under both ambient is lower than the predetermined illuminance environment, and characterized by displaying an object image by infrared light on the object side central region of the wide-angle lens system that has passed through the first transmission means.

According to a third aspect of the present invention, the wide-angle lens system of the wide-angle camera unit includes a front group lens on the object side and a rear group lens on the image plane side with an aperture interposed therebetween. A first lens and a second lens having negative refractive power in order from the side, a third lens having positive refractive power, and the rear lens group has a fourth lens having positive refractive power, The lens surface on the object side of the second lens is formed in a planar shape in a direction orthogonal to the optical axis, and the first transmitting means has an optical axis on the planar lens surface on the object side of the second lens. A first coating film that transmits light having a wavelength in the infrared light region deposited on the center side with respect to the center, and the second transmission means includes visible light deposited concentrically on the outer peripheral side of the first coating film. that the second coating layer which transmits light in the wavelength region It is a symptom.

According to a fourth aspect of the present invention, the first coating film is a thin film formed by alternately laminating a plurality of TiO ₂ and SiO ₂ by a vacuum deposition method , and the second coating film is formed by a vacuum deposition method. ta ₂ O ₅ and is characterized in thin der Rukoto formed by stacking a plurality of SiO ₂ alternately.

Inventions of claim 5, the wide-angle camera unit is characterized in that installed in the front center portion of the vehicle.

According to the in- vehicle camera device of the present invention, the object image by the infrared light in the object-side central region of the wide-angle lens system that has passed through the first transmission means of the wide-angle camera unit is received by the light-receiving surface of the solid-state image sensor, and the electric signal is received. The object image by the visible light in the peripheral area on the object side of the wide-angle lens system that has passed through the second transmission means is received by the light receiving surface of the solid-state imaging device and converted into an electrical signal, Without using a switching mechanism that switches the focus position of the lens between visible light and infrared light, it is possible to capture images well in the daytime and at night, and the infrared LED, visible light and infrared light Since a switching mechanism for switching the in-focus position is not used, a compact and inexpensive on- vehicle camera device can be provided.

Further, according to the vehicle camera system according to the present invention, by an image displayed on the display unit by processing the image signal which can be displayed by the signal processing means an electrical signal output from the solid-state imaging device of the wide angle camera unit, An object image by infrared light in the central area on the object side of the wide-angle lens system that has passed through the first transmission means and a subject image by visible light in the peripheral area on the object side of the wide-angle lens system that has passed through the second transmission means are displayed on the display means. can do.

Hereinafter, the present invention will be described based on the illustrated embodiments.
<Embodiment 1>
FIG. 1 is a schematic diagram showing a vehicle equipped with an in-vehicle camera device having a wide-angle camera unit according to Embodiment 1 of the present invention, and FIG. 2 is a schematic configuration diagram showing the wide-angle camera unit according to Embodiment 1 of the present invention. is there. In addition, this embodiment is an example applied to the vehicle-mounted camera apparatus which images the front periphery and front front of a vehicle, and displays it on a monitor.

  As shown in FIG. 1, an in-vehicle camera device 1 according to this embodiment includes a wide-angle camera unit 3 installed at the center of a vehicle front surface (for example, front grill front surface) 2 a of a vehicle (automobile) 2, and a wide-angle camera unit 3. A processing unit 4 that processes an electrical signal output from the monitor, a monitor 5 such as a liquid crystal monitor (LCD) that receives an image signal output from the processing unit 4 and displays an image captured by the wide-angle camera unit 3, and a vehicle An illuminance sensor 6 that detects ambient illuminance (brightness) is provided. The processing unit 4 is installed inside an instrument panel (not shown) in the passenger compartment, and the monitor 5 is installed on the instrument panel. The illuminance sensor 6 is installed inside the front window.

  2, the wide-angle camera unit 3 includes a wide-angle lens system 10, a CCD image sensor (hereinafter referred to as “CCD”) 11 as a solid-state imaging device, and a camera unit body 18. The CCD 11 is visible. It has sensitivity to wavelengths in the near-infrared light region of the infrared light from the light region.

  The wide-angle lens system 10 includes a first lens 12 having a negative refractive power and a negative refractive power, which are sequentially arranged from the object side (left side in FIG. 2) toward the image plane (the light receiving surface 11a of the CCD 11). It has the 2nd lens 13, the 3rd lens 14 which has positive refractive power, and the 4th lens 15 which has positive refractive power. In addition, a diaphragm 16 is disposed between the third lens 14 and the fourth lens 15, and behind the fourth lens 15 (on the image plane (light receiving surface 11a side of the CCD 11)) is a parallel having a function such as a low-pass filter. A planar glass filter 17 is disposed. The outer peripheral surfaces of the first lens 12 to the fourth lens 15, the diaphragm 16, and the glass filter 17 are positioned and supported by a support (not shown) provided in the camera unit main body 18.

  As described above, the wide-angle lens system 10 according to the present embodiment includes two groups including the first lens 12, the second lens 13, and the third lens 14 that constitute the front group lens, and the fourth lens 15 that constitutes the rear group lens. This is an ultra-wide-angle lens unit having a four-lens configuration and having a super-wide field angle of about 190 ° with a single focal point. Note that the wide-angle lens system 10 in the present embodiment is configured to favorably focus on the light receiving surface 11a of the CCD 11 with respect to wavelengths from the visible light region to the near infrared light region.

  The first lens 12 has a convex surface 12a on the object side and a concave surface 12b on the image surface side. The second lens 13 has a flat surface 13a on the object side and a concave surface 13b on the image surface side. The third lens 14 has a convex surface 14a on the object side and a convex surface 14b on the image surface side. The fourth lens 15 has a convex surface 15a on the object side and a concave surface 15b on the image surface side. The first lens 12 to the fourth lens 15 are made of a glass material, and the concave surface 12b on the image plane side of the first lens 12 is formed in an aspherical shape.

  Further, on the object-side plane 13a of the second lens 13, a first coating film A1 and a second coating film A2 are deposited concentrically on the center side and the outer peripheral side thereof, respectively. The first coating film A1 on the center side is a film that transmits only the wavelength in the near-infrared light region (wavelength of about 600 to 1000 nm), and the second coating film A2 on the outer peripheral side is the wavelength in the visible light region (420 (Wavelength of about ˜620 nm).

The first coating film A1 is formed by alternately stacking about 40 to 60 layers of TiO ₂ (titanium oxide) and SiO ₂ (silicon oxide) by, for example, a vacuum deposition method. The film thickness is about several hundred nm. The second coating film A2 is formed by alternately laminating Ta ₂ O ₅ (tantalum pentoxide) and SiO ₂ (silicon oxide) in about 40 to 60 layers by, for example, a vacuum deposition method. The film thickness is about several hundred nm.

  When depositing the first coating film A1 on the center side of the flat surface 13a of the second lens 13, the deposition area of the second coating film A2 on the outer peripheral side is covered with a mask and deposited only on the center side. When the second coating film A2 is deposited on the flat surface 13a of the two lenses 13, the deposition area of the deposited first coating film A1 is covered with a mask and deposited only on the outer peripheral side. Thus, the first coating film A1 that transmits only the wavelength in the near-infrared light region is deposited on the center side of the plane 13a on the object side of the second lens 13, and only the wavelength in the visible light region is transmitted on the outer peripheral side thereof. A second coating film A2 is deposited. Further, since the object-side flat surface 13a of the second lens 13 is formed in a flat shape, the first coating film A1 and the second coating film A2 can be easily and uniformly deposited.

  As a result, as shown in FIG. 2, only near-infrared light passes through the first lens 12 to the plane 13 a of the second lens 13 within the range of the angle of view θ1 of about 60 to 70 ° with respect to the optical axis. The light passes through the deposited first coating film A1 and enters the light receiving surface 11a of the CCD 11 through the second lens 13, the third lens 14, the fourth lens 15, and the glass filter 17. In addition, within the range of the angle of view θ2 of about 70 to 190 ° with respect to the optical axis, only visible light passes through the second coating film A2 deposited on the flat surface 13a of the second lens 13 through the first lens 12. The light enters the light receiving surface 11a of the CCD 11 through the second lens 13, the third lens 14, the fourth lens 15, and the glass filter 17. Note that R, G, and B color filters (not shown) are arranged on the front side of each pixel of the CCD 11.

  As shown in FIG. 3, the processing unit 4 includes a CDS (correlated double sampling unit) 20, an AGC (analog gain control unit) 21, an A / D conversion unit 22, a signal processing unit 23, an image selection unit 24, and a control. Part (CPU) 25.

  The CDS 20 samples the electric signal output from the CCD 11. The AGC 21 adjusts the gain of the electrical signal (analog image signal) sampled by the CDS 20. The A / D converter 22 A / D converts the electrical signal (analog image signal) output from the AGC 21. The signal processor 23 converts the image data converted into a digital signal by the A / D converter 22 into an image signal that can be displayed on the monitor 5.

  The image selection unit 24 monitors the image signal input from the signal processing unit 23 based on a determination signal (a signal based on illuminance information around the vehicle detected by the illuminance sensor 6) input from the control unit 25. 5 is selected (an image of near infrared light transmitted through the first coating film A1 or an image of visible light transmitted through the second coating film A2) (details will be described later). The control unit (CPU) 25 controls the on-vehicle camera device 1 according to the present embodiment including the operation control of the processing unit 4.

  The driver (operator) manually operates the selection switch 26 and inputs a selection signal to the control unit 25, so that an image to be displayed on the monitor 5 (near infrared light transmitted through the first coating film A1). Or an image of visible light transmitted through the second coating film A2) can be selected by the image selection unit 24.

  Next, an image display operation by the in-vehicle camera device 1 according to the above-described embodiment will be described with reference to a flowchart shown in FIG.

  A wide-angle lens system 10 of the wide-angle camera unit 3 installed at the center of the vehicle front surface (for example, front surface of the front grille) 2a of the vehicle 2 causes a horizontal direction of the vehicle front surface (a direction parallel to the vehicle front surface) as shown in FIG. ) Is formed on the light receiving surface 11 a of the CCD 11. An electrical signal corresponding to the optical image output from the CCD 11 is converted into a digital format by the A / D converter 22 through the CDS (correlation double sampling unit) 20 and the AGC (analog gain controller) 21 of the processing unit 4. Converted to image data.

  The signal processing unit 23 performs image processing such as gamma correction, contour correction, and white balance correction on the image data output from the A / D conversion unit 22 and converts the image data into an image signal that can be displayed on the monitor 5. Then, the processed image signal is output to the image selection unit 24 (step S1).

  The image signal input to the image selection unit 24 includes an image signal corresponding to an image of near infrared light transmitted through the first coating film A1 deposited on the center side of the plane 13a of the second lens 13, and a second signal. The image signal corresponding to the image of visible light which permeate | transmitted 2nd coating film A2 vapor-deposited on the outer peripheral side of the plane 13a of the lens 13 is included.

  Then, the illuminance sensor 6 detects the illuminance around the vehicle (step S2). The control unit 25 compares the illuminance information (detected illuminance) input from the illuminance sensor 6 with the preset illuminance (step S3). If it is determined in step S3 that the detected illuminance is greater than or equal to the set illuminance (detected illuminance ≥ set illuminance) (step S3: YES), that is, if the surroundings of the vehicle are bright enough to be visible in the daytime or the like. Outputs a determination signal corresponding to this determination to the image selection unit 24.

  Then, based on the determination signal input from the control unit 25, the image selection unit 24 outputs an image signal corresponding to the visible light image transmitted through the second coating film A2 from the image signal input from the signal processing unit 23. The image of visible light on both sides in front of the vehicle is selected and displayed on the monitor 5 (step S4).

  For example, as shown in FIG. 5, in a situation where the surroundings of the vehicle are brighter than can be visually recognized in the daytime or the like, the vehicle 2 equipped with the in-vehicle camera device 1 is moved forward from an alley where the left and right prospects are poor by the hedge 31 or the like. When making a left turn with respect to the intersecting road 30, only the vicinity of the vehicle front surface 2a enters the road 30 and stops. As a result, an image of visible light transmitted through the second coating film A2 on the outer peripheral side deposited on the flat surface 13a of the second lens 13 of the wide-angle lens system 10 provided in the wide-angle camera unit 3 is displayed on the monitor 5.

  In FIG. 5, a <b> 1 and a <b> 2 (parts indicated by oblique lines) are images in the horizontal direction of the front surface of the vehicle corresponding to visible light transmitted through the second coating film A <b> 2 of the wide-angle lens system 10 (direction parallel to the front surface 2 a of the vehicle). The left and right sides of the road 30 that are areas and are blind spots from the driver's seat are displayed on the monitor 5. Thereby, even in an alley or the like where the left and right front lines are not visible, it is possible to safely and easily confirm the situation on both front sides of the vehicle front surface 2a.

  Note that the near-infrared light image transmitted through the first coating film A1 on the front front side of the vehicle 2 (the region between the imaging region a1 and the imaging region a2 in FIG. 5) may also be displayed on the monitor 5. . In the present embodiment, in a situation where the surroundings of the vehicle are bright enough to be visible in the daytime or the like, the front side of the front of the vehicle 2 can be directly viewed by the driver, so that it is not displayed on the monitor 5. Image processing.

  Further, when it is determined in step S3 that the detected illuminance is less than the set illuminance (step S3: NO), that is, when the surroundings of the vehicle are dark and difficult to see at night or the like, a determination signal corresponding to this determination is given. The image is output to the image selection unit 24.

  Then, the image selection unit 24 is based on the determination signal input from the control unit 25, and corresponds to an image of near infrared light transmitted through the first coating film A1 from the image signal input from the signal processing unit 23. A signal is selected, and a near-infrared light image on the front side in front of the vehicle is displayed on the monitor 5 (step S5).

  For example, as shown in FIG. 6, in the situation where the front of the vehicle 2 is dark and difficult to see at night or the like (in FIG. 6, the front of the vehicle 2 in the forward direction in the night (light of the headlight of the vehicle 2 (low beam)) In the case where a pedestrian 32 or a person 33 riding a bicycle crosses the road), the plane 13a of the second lens 13 of the wide-angle lens system 10 provided in the wide-angle camera unit 3 An image of near-infrared light transmitted through the deposited first coating film A1 on the center side is displayed on the monitor 5.

  In FIG. 6, a <b> 3 (part indicated by oblique lines) is an image in the horizontal direction of the vehicle front surface (direction parallel to the vehicle front surface 2 a) corresponding to the near-infrared light transmitted through the first coating film A <b> 1 of the wide-angle lens system 10. The road surface ahead of the vehicle 2 is displayed on the monitor 5 so as not to reach the light of the headlight of the vehicle 2 that is a region that is difficult for the driver to visually recognize. As a result, it is possible to easily confirm the situation ahead so that the light (low beam) of the headlight of the vehicle 2 that is difficult for the driver to visually recognize at night does not reach.

  Thus, according to the vehicle-mounted camera device 1 according to the present embodiment, an infrared LED that emits infrared light for nighttime, a switching mechanism that switches the focusing position of the lens between visible light and infrared light, and the like are provided. Therefore, good imaging can be performed with the single wide-angle camera unit 3 during daytime and nighttime. Thereby, based on the illuminance information around the vehicle detected by the illuminance sensor 6, the subject image by the near infrared light in the object-side central region of the wide-angle lens system 10 that has passed through the first coating film A1, or the second coating film A subject image by visible light in the peripheral area on the object side of the wide-angle lens system 10 that has passed through A2 can be selected and displayed on the monitor 5.

  Note that when the driver (operator) operates the selection switch 26 to input a selection signal to the control unit 25, the selection signal is output from the control unit 25 to the image selection unit 24. Thereby, regardless of the illuminance information around the vehicle detected by the illuminance sensor 6, either one of the above-described visible light image or near-infrared light image based on the driver's intention, or both Can be displayed on the monitor 5.

  Moreover, according to the vehicle-mounted camera apparatus 1 which concerns on this embodiment, it is not necessary to use the nighttime infrared LED and the switching mechanism which switches the focus position of a lens with visible light and infrared light like a prior art example. Therefore, the compact and inexpensive wide-angle camera unit 3 can be provided.

  In the above embodiment, the first coating film A1 and the second coating film A2 are concentrically deposited on the flat surface 13a of the second lens 13 of the wide-angle lens system 10. However, the present invention is not limited to this. The coating film A1 and the second coating film A2 are formed on the object-side convex surface 12a, the image-side concave surface 12b, the image-side concave surface 13b of the second lens 13, and the third lens 14 of the first lens 12 of the wide-angle lens system 10. The vapor deposition may be performed on one of the convex surface 14a on the object side and the convex surface 14b on the image side.

  In the above embodiment, the wide-angle lens system 10 is coated on the flat surface 13a of the second lens 13 in order to transmit the light rays in the near infrared wavelength region and the light rays in the visible wavelength region concentrically. The film (the first coating film A1 and the second coating film A2) is deposited. However, the present invention is not limited to this. For example, near-infrared light with respect to the wide-angle lens system 10 in front of the first lens 12 on the object side. It is also possible to arrange a filter, a diffraction grating, or the like having a configuration that allows concentric transmission of light rays in the wavelength region and visible light wavelength region.

  Moreover, in the said embodiment, although it was an example which applied the vehicle-mounted camera apparatus which concerns on this invention to the vehicle-mounted camera apparatus which images a vehicle front periphery area and displays it on a monitor, in addition to this, for example, a vehicle back periphery The present invention is also applicable to an in-vehicle camera device (back guide monitor device) that captures an image and displays it on a monitor.

<Embodiment 2>
FIG. 7 is a block diagram illustrating a configuration of an in-vehicle camera device including a wide-angle camera unit according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as Embodiment 1 shown in FIGS. 1-3, and the overlapping description is abbreviate | omitted.

  As described above, the image signal generated by the signal processing unit 23 corresponds to an image of near infrared light transmitted through the first coating film A1 deposited on the center side of the flat surface 13a of the second lens 13 of the wide-angle lens system 10. And an image signal corresponding to an image of visible light transmitted through the second coating film A2 deposited on the outer peripheral side of the flat surface 13a of the second lens 13.

  In the present embodiment, the monitor 5 is located on the center side of the flat surface 13a of the second lens 13 based on the image signal output from the signal processing unit 23 in an environment such as daytime when the surroundings of the vehicle is equal to or greater than a predetermined illuminance. Both the near infrared light image transmitted through the deposited first coating film A1 and the visible light image transmitted through the second coating film A2 deposited on the outer peripheral side of the flat surface 13a of the second lens 13 are displayed. As a result, images of the front front area and both front areas of the vehicle 2 are displayed on the monitor 5 in an environment such as daytime when the surroundings of the vehicle are equal to or greater than a predetermined illuminance.

  Further, in an environment such as nighttime where the surroundings of the vehicle are less than a predetermined illuminance, the monitor 5 is deposited on the center side of the flat surface 13a of the second lens 13 based on the image signal output from the signal processing unit 23. An image of near infrared light transmitted through the film A1 is displayed (a visible light image cannot be displayed at night). Thereby, the image of the front front area of the vehicle 2 is displayed on the monitor 5 in an environment such as nighttime where the surroundings of the vehicle are less than the predetermined illuminance.

  Thus, according to the in-vehicle camera device according to the present embodiment, the nighttime and nighttime without providing the infrared LED for nighttime or the switching mechanism for switching the focus position of the lens between visible light and infrared light. The image captured by the single wide-angle camera unit 3 can also be displayed on the monitor 5. Further, unlike the conventional example, it is not necessary to provide a night-time infrared LED or a switching mechanism for switching the focus position of the lens between visible light and infrared light, so that a compact and inexpensive wide-angle camera unit 3 is provided. can do.

Schematic which shows the vehicle carrying the vehicle-mounted camera apparatus which concerns on Embodiment 1 of this invention. 1 is a schematic configuration diagram showing a wide-angle camera unit according to Embodiment 1 of the present invention. The block diagram which shows the structure of the vehicle-mounted camera apparatus which concerns on Embodiment 1 of this invention. 5 is a flowchart showing an image display operation by the in-vehicle camera device according to the first embodiment of the present invention. The figure which shows the imaging area | region of the front both sides of the vehicle in daytime etc. The figure which shows the imaging area of the front front of the vehicle at night etc. The block diagram which shows the structure of the vehicle-mounted camera apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car-mounted camera apparatus 2 Vehicle 2a Car body front surface 3 Wide-angle camera unit 4 Processing part 5 Monitor (display means)
6 Illuminance sensor (illuminance detection means)
10 Wide-angle lens system 11 CCD (solid-state image sensor)
12 1st lens 13 2nd lens 14 3rd lens 15 4th lens 23 Signal processing part (signal processing means)
24 Image selection unit 25 Control unit (control means)
A1 First coating film (first permeation means)
A2 Second coating film (second permeation means)

Claims (5)

A wide-angle lens system configured by arranging a plurality of lenses from the object side to the image plane side, and a subject image formed by the wide-angle lens system is received by a light-receiving surface having a plurality of pixels and converted into an electrical signal. and a solid-state imaging device for converting, one lens of the plurality of lenses constituting the front Symbol wide-angle lens system or on the object side in front of the closest lens on the object side of the plurality of lenses, A first transmission means for transmitting light having a wavelength in the infrared light region is provided on the center side with the optical axis of the wide-angle lens system as a center, and a wavelength in the visible light region is formed concentrically on the outer peripheral side of the first transmission device. A second transmissive unit that transmits the first light beam, and receives an object image by infrared light in the object-side central region of the wide-angle lens system transmitted through the first transmissive unit on the light receiving surface of the solid-state imaging device to receive an electrical signal And convert to A wide-angle camera unit for converting the electric signal of a subject image by visible light on the object side peripheral region of the wide-angle lens system that has been transmitted through the transmission means and received by the light receiving surface of the solid-
Signal processing means for processing an electrical signal output from the solid-state imaging device of the wide-angle camera unit disposed at a predetermined position of a vehicle into a displayable image signal;
Display means for displaying the image by inputting the image signal generated by the signal processing means;
Illuminance detection means for detecting the illuminance around the vehicle;
Based on the illuminance information detected by the illuminance detection means, when it is determined that the surroundings of the vehicle is greater than or equal to a predetermined illuminance, at least by the visible light in the object-side peripheral area of the wide-angle lens system that has passed through the second transmission means Control is performed so that an image signal output from the signal processing unit corresponding to the subject image is selected and displayed on the display unit, and when it is determined that the surroundings of the vehicle are less than a predetermined illuminance, the first transmission unit is transmitted. to have a control means for controlling so as to be displayed on said display means by selecting an image signal output from said signal processing means corresponding to the object image by the infrared light on the object side central region of the wide-angle lens system has,
An in- vehicle camera device characterized by that. A wide-angle lens system configured by arranging a plurality of lenses from the object side to the image plane side, and a subject image formed by the wide-angle lens system is received by a light-receiving surface having a plurality of pixels and converted into an electrical signal. A solid-state imaging device for conversion, one lens of the plurality of lenses constituting the wide-angle lens system, or the object side front of the lens closest to the object side of the plurality of lenses, A first transmission means for transmitting a light beam having a wavelength in the infrared light region is provided on the center side with the optical axis of the wide-angle lens system as a center, and a wavelength of a visible light region is concentrically formed on the outer peripheral side of the first transmission device. A second transmission unit configured to transmit a light beam; an object image of infrared light in the object-side central region of the wide-angle lens system that has passed through the first transmission unit is received by the light-receiving surface of the solid-state imaging device and converted into an electrical signal; With the conversion A wide-angle camera unit for converting the electric signal of a subject image by visible light on the object side peripheral region of the wide-angle lens system that has been transmitted through the transmission means and received by the light receiving surface of the solid-
Signal processing means for processing an electrical signal output from the solid-state imaging device of the wide-angle camera unit disposed at a predetermined position of a vehicle into a displayable image signal;
Display means for displaying the image by inputting the image signal generated by the signal processing means,
Based on the image signal output from the signal processing unit, the display unit is configured to transmit infrared light in the central region on the object side of the wide-angle lens system that has passed through the first transmission unit in an environment where the surroundings of the vehicle have a predetermined illuminance or higher. And the subject image by the visible light in the object side peripheral area of the wide-angle lens system that has passed through the second transmission means are displayed and transmitted through the first transmission means in an environment where the vehicle periphery is less than a predetermined illuminance. Display a subject image by infrared light in the central region on the object side of the wide-angle lens system,
An in- vehicle camera device characterized by that. The wide- angle lens system of the wide- angle camera unit includes a front group lens on the object side and a rear group lens on the image plane side with a stop interposed therebetween, and the front group lens has negative refractive power in order from the object side. A first lens, a second lens, a third lens having a positive refractive power, and the rear lens group has a fourth lens having a positive refractive power, and a lens surface on the object side of the second lens; Is formed in a planar shape perpendicular to the optical axis,
The first transmission means is a first coating film that transmits a light beam having a wavelength in an infrared region deposited on a central side around an optical axis on a planar lens surface on the object side of the second lens, The second transmission means is a second coating film that transmits a light beam having a wavelength in the visible light region concentrically deposited on the outer peripheral side of the first coating film.
The in- vehicle camera device according to claim 1 or 2 , wherein The first coating film is a thin film formed by alternately laminating a plurality of TiO ₂ and SiO ₂ by a vacuum evaporation method, and the second coating film is an alternating film of Ta ₂ O ₅ and SiO ₂ by a vacuum evaporation method. A thin film formed by laminating a plurality of layers,
The in- vehicle camera device according to claim 3 . The wide-angle camera unit is installed in the front center of the vehicle.
The in-vehicle camera device according to any one of claims 1 to 4 , wherein the on-vehicle camera device is provided.

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