JPH0550880A - Rearward checking device for vehicle - Google Patents

Abstract

PURPOSE:To enhance the reliability of a rearward checking device for a vehicle by providing a display for inverting the polarity of a sawtooth wave signal for vertical deflection in a contactless manner when input of a reverse image camera is displayed. CONSTITUTION:A reverse image camera 1 inverted 10 degrees and mounted on a car body, and a non-reverse image camera 2 mounted on the car body normally in the vertical direction, are provided. Further, a display 3 having a reverse circuit for reversing the polarity of a sawtooth wave signal for vertical deflection in a contactless manner when input of the reverse image camera is displayed, and selectively image-indicating the inputs of the two cameras 1, 2 is provided. Thus, the indication is switched to a right-left reversed image and a normal image by switching the cameras 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear confirmation device for preventing operation mistakes and accidents in blind spots where visual confirmation is difficult, mainly when driving automobiles such as buses and trucks.

[0002]

2. Description of the Related Art Recently, in a television camera, a solid-state image pickup element has been increasingly used instead of a conventional image pickup tube because of its superior vibration resistance and reliability. A conventional vehicle direction confirmation device will be described below. FIG. 2 is a side view of the vehicle showing the arrangement of the cameras of the conventional vehicle rear confirmation device. In the figure,
Reference numeral 1 is a reverse video camera for confirming the rear of the vehicle, and 2 is a non-reverse video camera for confirming directly under the front.

Conventionally, a left-right inverted image similar to that seen from a rear-view mirror and a non-inverted image similar to that seen directly below the front are 1
When switching and displaying on two displays, a camera that reverses the horizontal deflection or a camera that flips left and right by mirrors in advance is used as the image input, or the polarity of horizontal deflection scanning is switched on the display side according to the camera, etc. was there.

[0004]

However, in the above-mentioned conventional vehicle rear confirmation device, in the case of the solid-state image pickup device, it is difficult to perform the reverse scanning, and the horizontal reversal operation is performed on the display side. In general, since a large current of several amperes is required, a large relay having a sufficient current switching capacity is required, and there is a disadvantage that the reliability of the system is deteriorated because it is a mechanical contact. Further, if only horizontal deflection scanning inversion is performed, generally, a cathode ray tube (CR
Since the correction magnet or the like for correcting the deviation of the deflection center of T) works to promote the deviation, there is a problem that the deviation of the angle of view in the horizontal direction is caused, and the image loss may occur.

The present invention is intended to solve such a conventional problem, and provides an excellent vehicle rear confirmation device capable of accurately displaying a left-right inverted image and a non-inverted image both accurately and with high reliability in an ideal operation. It is intended to be provided.

[0006]

In order to achieve the above object, the present invention provides a reversing image camera which is previously mounted upside down on a vehicle, a non-reversing image camera which is normally mounted, and The video input signals of two cameras are selectively switched, and the vertical deflection scanning can be inverted according to the switching of the input signals, and at the same time, the display is capable of correcting the centering and the deflection linearity. The display is satisfactory.

[0007]

In the above structure, the reversed image camera, which is mounted by turning it upside down in advance, flips it vertically and horizontally. When displaying the image from the input from this camera,
By reversing the upper and lower sides using a display capable of reversing the vertical deflection scanning, an image in which only the left and right sides are reversed can be obtained, and at the same time, center deviation and linearity correction due to the movement of the deflection center with respect to the CRT are performed. Further, when the input is switched to the non-inverted video camera, vertical deflection scanning inversion and correction are not performed. The reversal of the vertical deflection scanning is performed without contact by reversing the polarity of the sawtooth wave applied to the vertical amplifier. With the above-mentioned means, it is possible to easily perform the inversion and non-inversion display with good image quality.

[0008]

1 is a schematic electrical connection diagram showing an embodiment of the present invention. In the figure, 1 is a reverse video camera mounted on the vehicle by turning it upside down for rearward confirmation, 2 is a non-reversal video camera normally mounted on the vehicle for frontward or sideward confirmation, and 3 is the above It is a display for displaying the input from the reverse video camera 1 or the non-reverse video camera 2 as an image. Reference numeral 4 is a CRT which is in charge of image display in the display 3 and 5 is an input from the reverse video camera 1 or the non-reverse video camera 2 as the C
A video signal processing unit for performing signal processing up to the signal required by RT4, a vertical transmission unit 6 for generating a sawtooth wave used for vertical deflection scanning of the CRT 4, and a polarity inversion of the output of the vertical transmission unit 6. It is an inverting circuit that uses a transistor for switching. It should be noted that an inverted output is obtained at the collector of the transistor and a non-inverted output is obtained at the emitter at the same time. Reference numeral 8 is a vertical amplifier for amplifying the sawtooth wave output from the inversion circuit 7, 9 is a vertical deflection coil for vertically deflecting the electron beam of the CRT 4, and 10 is the inverted image camera 1
And a control operation switch for selecting an input to the non-reversed video camera 2 and selections 11 and 12 for selecting the reverse video camera 1 and the non-reversed video camera 2 according to the operation of the control operation switch 10. Selectors 13 and 14 select inversion or non-inversion of the vertical deflection scan of the CRT 4 according to the operation of the control operation switch 10. Reference numeral 1 indicates the reverse of the presence or absence of the control voltage supplied from the control operation switch 10. A circuit, 16 is a linearity correction circuit for correcting the linearity of scanning when the vertical deflection scanning of the CRT 4 is reversed, 1
A centering correction circuit 7 corrects the vertical center position of the CRT 4. The above-described reference numerals 4 to 17 constitute the display 3.

Next, the operation of the above embodiment will be described.
First, when the control operation switch 10 is in the “off” state and the non-inverted video camera 2 is selected, the selector 1
1 and 13 are connected to the selectors 12 and 14, which are not connected because no control voltage is applied, because they are inverted by the inverting circuit 15 and have a voltage applied thereto. The output signal of 2 becomes the input of the video signal processing unit 5, is subjected to signal processing, and is input to the CRT 4. The sawtooth wave generated in the vertical transmission unit 6 is input to the inverting circuit 7 including a transistor. An inverted output is obtained at the collector of the transistor and a non-inverted output is obtained at the emitter, and the non-inverted output is connected to the vertical amplifier 8 by the selector 13 and is amplified and supplied to the vertical deflection coil 9. At this time, both the linearity correction circuit 16 and the centering correction circuit 17 have no control voltage by the control operation switch 10,
Do not work. Next, when the control operation switch 4 is in the “ON” state and the reverse video camera 1 is selected,
A control voltage is applied to the selectors 11 and 13 to connect them,
The negating circuit 15 does not apply a control voltage to the selectors 12 and 14 and does not connect them. The reverse video camera 1 is connected to the input of the video signal processing unit 5. The video output of the above-mentioned reverse video camera 1 mounted on the vehicle by being turned over is upside down and right and left. The inverting output of the inverting circuit 7 is connected to the input of the vertical amplifier 8 by the selector 13, amplified, and supplied to the vertical deflection coil 9. Therefore CR
The image displayed on T4 is normal up and down, left and right are reversed,
It will be just like the image seen through the rearview mirror. On the other hand, since the control voltage is applied, the linearity correction circuit 16 and the centering correction circuit 17 operate to correct the non-linearity and the center shift associated with the vertical inversion scanning. As described above, the selectors 11, 12, 13 and 14 perform contactless switching of cameras and vertical scanning, and the linearity correction circuit 16 and the centering correction circuit 17 are also contactlessly controlled, which is high. You can expect reliability.

[0010]

As is apparent from the above embodiment, the present invention has the following effects.

(1) The reverse video camera and the non-reverse video camera having the same specifications can be used, and it suffices to change the mounting method, which is useful for standardization.

(2) Since the deflection inversion of the display is performed only in the vertical direction, contactless control can be realized and high reliability can be expected.

(3) Since it is easy to correct the deviation of the deflection center of the CRT, an ideal display without image loss can be performed.

[Brief description of drawings]

FIG. 1 is a schematic electrical connection diagram of an embodiment of a vehicle rear confirmation device according to the present invention.

FIG. 2 is a side view of a vehicle showing a camera arrangement of a conventional vehicle rear confirmation device.

[Explanation of symbols]

 1 Inverted video camera 2 Non-inverted video camera 3 Display 7 Inversion circuit 16 Linearity correction circuit 17 Centering correction circuit

Claims (2)

[Claims] 1. A reverse video camera mounted upside down for confirming the rear of the vehicle, a non-reversed video camera mounted normally up and down, and an input of the reverse video camera when displayed. And a display for selectively displaying images of the inputs of the two cameras, which has a reversing rotation for reversing the polarity of the sawtooth wave signal for vertical deflection without contact, and obtains a backward confirmation image with left and right reversed. Vehicle rear confirmation device. 2. The vehicle rear confirmation apparatus according to claim 1, further comprising a linearity correction circuit for correcting linearity of vertical deflection and a centering correction circuit for correcting centering while inverting the polarity of the sawtooth wave signal for vertical deflection. .