KR20070099196A - Lateral detection monitoring apparatus and method, its manufacture method - Google Patents

Abstract

An apparatus and a method for monitoring a lateral direction and a manufacturing method therefor are provided to acquire an image of a left/right direction and offer the acquired image to a user. A prism(21) receives a beam of a lateral direction. The first lens(22) receives an emission beam of the prism(21), and has a positive refractive index. The second lens(23) receives an emission beam of the first lens(22), and has a positive refractive index. The third lens(24) receives an emission beam of the second lens(23), and has a negative refractive index. An image sensor(27) converts an emission beam of the third lens(24) into an electric signal.

Description

Lateral monitoring device and method, manufacturing method thereof {LATERAL DETECTION MONITORING APPARATUS AND METHOD, ITS MANUFACTURE METHOD}

1 is a perspective view of a vehicle equipped with a side monitoring apparatus according to the present invention.

2A and 2B are lens optical system diagrams of a side monitoring device according to the present invention;

3 is a view showing an optical path of the lens optical system according to the present invention.

4 is a view showing an MTF curve of the side monitoring device of the present invention.

5 is a view showing a wide angle range of a vehicle equipped with a side monitoring device according to the present invention.

6 is a view showing an example of a display image of the side monitoring apparatus according to the present invention.

<Explanation of symbols for main parts of the drawings>

10: car # 20: side monitoring device

21: Prism 22,23,24: Lens

25: flat plate plate 27: image sensor

30: display unit

The present invention relates to a side monitoring device and method, and a manufacturing method thereof.

The car is equipped with two side mirrors and one rearview mirror so that the driver can observe objects appearing from behind or left and right while driving.

However, in the case of the side mirror, it is possible for the driver to use it at an arbitrary angle, but the viewing range is limited. In particular, the passenger side side mirror is out of the driver's range of activity, so the angle adjustment is impossible while driving. We do not observe vehicles, people or other objects that are driven.

In the case of the rearview mirror, a long rearview mirror is used to widen the reflection angle. As the size of the rearview mirror increases, the driver often touches the rearview mirror when using the sunshade attached to the top of the driver's seat, and also hits the rearview mirror when the driver bows. have.

These side mirrors and rearview mirrors reflect only a very small portion of the left and right and rear of the vehicle, and also generate a large amount of blind spots on the front left and right of the driver.

If you adjust the angles of the side mirrors and the rear mirrors to make the car visible, you will not see the blind spots. If you make the blind spots visible, the driver will not be aware of the obstacles near the car. There was a downside.

The present invention provides a side monitoring device, a method thereof, and a method of manufacturing the same.

The present invention provides a side monitoring apparatus, a method for manufacturing the same, and a method of manufacturing the same so that an image of a front left / right direction can be obtained and provided to a user.

The present invention is installed at the front and rear of a moving body, such as a vehicle, such as a passage of the building, the side sensing device and method for acquiring an image for the left / right direction based on the axis of the installation point and provide it to the user The present invention provides a method for manufacturing the same.

Lateral monitoring apparatus according to the present invention comprises a prism in which the lateral light is incident; A first lens receiving positive light from the prism and having a positive refractive power; A second lens receiving positive light from the first lens and having a positive refractive power; A third lens receiving the light emitted from the second lens and having a negative refractive power; And an image sensor for converting the outgoing light of the third lens into an electrical signal.

Lateral monitoring method according to the present invention comprises the steps of emitting light incident through the left and right sides of the prism; Emitting the light by one or more lenses having positive or negative refractive power; Converting light emitted by the lens into an electrical signal; And displaying the video signal converted into the electrical signal.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The side sensing device according to the present invention will be described as an example in the case where it is installed in a moving object such as a vehicle.

1 is a schematic configuration diagram of a side monitoring device applied to a vehicle according to the present invention, Figures 2a and 2b is a lens group configuration of the side monitoring device according to the present invention, Figure 3 is a side monitoring device according to the present invention It is a figure which shows the optical path which injects into the lens group of.

Referring to FIG. 1, the side monitoring apparatus 20 is a side monitoring camera module, and may be mounted at the center of the front or the back of the vehicle 10 to facilitate side sensing. Here, the position at which the side monitoring apparatus 20 is mounted may be installed in one or more numbers at other positions such as the front / rear bumper or the bumper periphery of the vehicle 10.

The side monitoring angle of the side monitoring device 20 may obtain an image in the left direction and the right direction based on the installation point. Here, the left direction 34 ° and the right direction 34 ° images may be acquired using the extension line of the installation point as an axis (for example, a bumper shaft).

The obtained image is provided to the driver through a display unit (not shown) of the side monitoring apparatus 20. Here, the display unit may separate and output the left and right images into respective areas.

The lens structure of the side monitoring apparatus 20 will be described in more detail with reference to FIGS. 2A and 2B.

As shown in FIGS. 2A and 2B, the prism 21, the first lens 22, the second lens 23, and the third lens 24 are included, and an image is provided on the output side of the third lens 24. The sensor 27 is located.

A flat plate 25 may be further provided between the third lens 24 and the image sensor 27 to uniformly arrive at the image sensor 27. This flat plate 25 is used for a normal image pickup device.

The light incident in the left / right direction of the prism 21 is transmitted to the image sensor 27 via the first lens 22, the second lens 23, and the third lens 24.

To this end, the prism 21 is a total reflection prism used to change the direction of light, it may be composed of a right prism having a cutting plane of a right isosceles triangle or a prism having no cutting plane of a right isosceles triangle.

The prism 21 is composed of incidence / reflection surfaces 21a and 21b and an emission surface corresponding to the lateral direction, and the incidence / reflection surface transmits light incident in the left / right direction and is transmitted from another surface. Reflect the light to the exit surface.

As shown in FIG. 2A, light flowing from the blind spot in the left direction passes through the first incidence / reflection surface 21a and is reflected from the second incidence / reflection surface 21b. 22), the light entering from the blind spot in the right direction as shown in FIG. 2B passes through the second incident / reflective surface 21b and is reflected from the first incident / reflective surface 21b so that the first lens 22 is reflected. Is incident on.

A pinhole 28 is formed between the prism 21 and the first lens 22 to adjust the aperture ratio, and the pinhole 28 may be implemented by a mask having the same optical axis as the lens. Can be.

The left / right light incident through the prism 21 is incident on the image sensor 27 through the first to third lenses 22, 23, and 24. Here, the first lens 22 and the second lens 23 have a positive refractive power, and the third lens 24 has a negative refractive power.

The first lens 22 is preferably formed such that the convex surface of the exit surface 22b has a larger curvature than the incident surface 22a. In addition, the incident surface 22a of the first lens 22 may have a convex surface or a plane. That is, the incident surface 22a of the first lens 22 may be a flat surface and the emission surface 22b may be a convex surface.

In this way, if the convex surface having a larger curvature on the exit surface 22b than the entrance surface 22a of the first lens 22 is formed, the light is mainly emitted rather than collected by the entrance surface 22a. Collected by 22b. Accordingly, since the traveling direction of the light is controlled by the emission surface 22b, it can stably enter the next lens, that is, the second lens 23.

The second lens 23 has a convex curvature in which the incident surface 23a corresponds to the exit surface 22b of the first lens 22, and the curvature of the exit surface 23b is different from that of the incident surface 23a. It may be formed with the same or smaller convex curvature.

The negative refractive power of the third lens 24 corresponds to the emission surface 23b of the second lens 23, and the incident surface 24a and the emission surface 24b of the third lens 24 are formed. Is designed to reduce chromatic and coma aberrations. In addition, the third lens 24 has a concave surface corresponding to the object side in order to form a meniscus shape, and incident light is collected and output by the third lens 24.

Here, the first lens 22 is a positive meniscus lens having an exit surface having a convex surface, and the second lens 23 has a convex surface with convex surfaces on the object side and the image side. Since the third lens 24 is made of a negative meniscus lens having a concave surface, a screen having excellent resolution and low distortion can be obtained.

The refractive index of each lens is preferably 1.53 for the first lens 22, 1.717 for the second lens 23, and 1.846 for the third lens 24.

In addition, the exit surface of the second lens 23 having a positive refractive index and the incident surface of the third lens 24 having a negative refractive index may be in surface contact with each other to maintain a gap. The first lens 22 is formed of a plastic material, and the second lens 23 and the third lens 24 are formed of a glass material.

Meanwhile, as shown in FIG. 3, light introduced from the left blind spot and light from the right blind spot pass through the prism 21, the three lens groups 22, 23, 24, and the flat plate 25. It is imaged on one image sensor 27.

The side monitoring device 20 includes a prism 21 having a wide angle of view, a first lens 22 and a second lens 23 having positive refractive power, and a third lens 24 having negative refractive power. By mounting the lens optical system, it is possible to provide a user with a screen with high resolution, low distortion and a wide blind spot.

In addition, since the side monitoring device 20 is composed of a combination of the prism 21 and the lenses 22, 23 and 24, the light incident from the left and the right through the prism 21 is first to third lenses. Images are formed in the image sensor 27 through the lenses 22, 23, and 24, respectively. The present invention may comprise the prism, the first to the third lens as a single lens module, and also affects a mirror (for example, a reflecting mirror) or optical characteristics for changing an optical path between the prism and the third lens. It is also possible to further configure a lens or the like that does not give.

Here, the prism 21 determines the angle of view, and the first lens 22 has at least one surface formed as an aspherical surface for correcting aberration of the prism 21, and the second lens 23 having positive refractive power. Emits the image passing through the first lens 22 to the third lens 24. Here, when the light passing through the first to third lenses 22, 23, and 24 is light in the left direction, the light is imaged on the left side of the image sensor 27. In the case of the light in the right direction, the light is formed on the right side of the image sensor 27. do.

In addition, one aspherical lens, which is the first lens 22, is made of plastic to achieve mass production and light weight, and to correct aberration correction-spherical aberration and tangential field curvature (T). The overall length is 18.35mm, focal length 4.0mm, aperture ratio F / 2.5 and angle of view of 68 ° or more.

Hereinafter, the MTF (Modulation Transfer Function) characteristic of the side monitoring apparatus according to the present invention is as shown in FIG. The MTF performance of the present invention is 57% at 100 lp / mm in the on axis. Further, in the 0.7 field, the present invention is 38% at 100 lp / mm. Here, the MTF curve represents the resolution, and the larger the value of the MFT, the better the performance.

5 is a view showing a side monitoring angle in a state in which the side monitoring device 20 according to the present invention is installed.

When the side monitoring device 20 according to the present invention having the above-described structure is mounted on a vehicle, the interior mirror of the vehicle generally has a horizontal angle of view (view angle) of at least 20 °, and the outdoor mirror is disposed at the rearmost seat at the driving side. Include an area (horizontal angle of view of 10 ° to 12 °) that allows you to see where you are 1 m behind and 2.4 m from the outside of the vehicle.

In the case of vans and vans, a reflector of 126cm2 shall be secured for 4.5t or less, and 323cm2 of reflector for 4.5t or more.

In the case of a passenger car, there is a large amount of overlap between the horizontal clock angle of the indoor mirror (20 °) and the horizontal clock angle of the outdoor mirror (10 ° to 12 °), and the distance between the driver's field of view and the horizontal clock angle of the outdoor mirror is large. I can cover a stand enough.

Accordingly, the lateral monitoring device 20 according to the present invention is at -9 ° (L2, R2) from the reference line L0, RO, which is the axis of the installation point (that is, the position where the prism or lens is installed) in the vehicle 10. Images can be acquired in the range of + 25 ° (L1, R1), minimizing blind spots beyond the outside clock limit line of the rearview mirror and the inside clock limit line of the side mirrors without the need to correct the position of the rear and rear mirrors. .

That is, the side monitoring device 20 captures the range of the blind spot from the range of -9 ° to + 25 ° on the bumper axis of the vehicle 10 with reference lines L0 and R0, and is installed in the vehicle as shown in FIG. The blind spots on the side can be confirmed by outputting to the left and right regions 31 and 32 of FIG. Here, the display unit 30 includes a display device such as an LCD.

Here, the left and right images are divided into two regions and displayed on the display unit 30. The left and right images may be separated and output in a left / right or up / down direction, and each region may be separated by a mounting angle of the prism. The vehicle bumper image is also displayed. In addition, when the vehicle is mounted on both front and rear bumpers, the display may be divided into four areas or only the lateral image of the front bumper or the rear bumper may be output to the two display areas. Through the present invention, the monitoring target and the display area can be variously changed.

Accordingly, by observing the periphery of the vehicle 10 without blind spots, it is possible to drive safely. In addition, the present invention can be installed not only in the front and rear of the vehicle, but also in the side of the vehicle, and can also perform side monitoring functions like a side mirror.

In addition, the side monitoring device 20 can acquire an image of an object at a wide angle of view (68 ° clock angle) from a short distance (30 cm) to a distant (infinity) in the lateral direction and provide a clear image to the display. And because the assembly process is easy, even if you are not a skilled person can increase the productivity of the product can reduce labor cost and production cost and improve the competitiveness of the product.

On the other hand, the side monitoring device 20 of the present invention can monitor the blind spot in the front or rear of the vehicle, and is also installed in the corridor, parking lot, etc. of the building to obtain an image for the left / right direction based on the installation point. You may.

In addition, the present invention may preferably further include an image storage device. Such an image storage device may store an image obtained in real time for a predetermined time and restore it when an accident occurs and use it as an accurate cause identification data. In addition, the present invention may include an image processor (eg, DSP) for processing the image obtained by the image sensor and output to the display.

Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. . Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the exemplary embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, and the technical spirit of the present invention is not necessarily limited or limited only by the exemplary embodiments. Rather, various changes and modifications can be made within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

As described above, the present invention obtains a left / right side image and provides the user with more stable driving and various traffic accidents.

In addition, the present invention by simultaneously acquiring the image in the left and right blind spot through the both sides of the prism that can refract the image to provide to the user, while forming the prism of the optical plastic while reducing the size of the lens optical system to the maximum By lowering the production cost there is an effect that can improve the productivity.

Claims (21)

A prism to which side light is incident; A first lens receiving positive light from the prism and having a positive refractive power; A second lens receiving positive light from the first lens and having a positive refractive power; A third lens receiving the light emitted from the second lens and having a negative refractive power; Lateral monitoring device including an image sensor for converting the outgoing light of the third lens into an electrical signal. The method of claim 1, And said prism is a total reflection prism. The method of claim 1, The prism is a side monitoring device, characterized in that the prism of the triangular shape that the light incident on each side is reflected from the other side and exits to the exit surface. The method of claim 1, The first lens is a side monitoring device, characterized in that formed of a plastic material. The method of claim 1, The second lens and the third lens side monitoring device, characterized in that formed of a glass material. The method of claim 1, The first lens has an incident surface formed as an aspherical surface, And the second and third lenses are formed in a spherical surface. The method of claim 1, And means for displaying the signal detected by the image sensor. The method of claim 7, wherein And the display means separates the left and right side signals into left and right areas and outputs the separated signals. The method of claim 1, The prism is a side monitoring device, characterized in that the angle of view in the left / right direction is the same as the installation point as a reference line. The method according to claim 1 or 9, And the prism has a viewing angle in a range of −9 ° to + 25 ° based on the installation point of the prism or lens. The method of claim 1, Lateral monitoring device, characterized in that the flat plate is further formed between the third lens and the image sensor. The method of claim 1, The side monitoring device is a side monitoring device, characterized in that installed on the front / rear bumper side of the vehicle. Emitting light incident through the left and right sides of the prism; Emitting the light by one or more lenses having positive or negative refractive power; Converting light emitted by the lens into an electrical signal; And displaying the left and right image signals converted into the electrical signals. The method of claim 13, The step of emitting light by the one or more lenses, The light emitted by the prism is emitted by the first and second lenses having a positive refractive index, and the light emitted by the second lens is emitted by a third lens having a negative refractive index Surveillance Method. The method of claim 13, The display step of the side monitoring method characterized in that for outputting the left and right image divided into left and right areas. Forming a prism in which light in a left / right direction is incident at an installation point; Providing at least one lens installed at an output side of the prism and having a positive refractive power or a negative refractive power; Providing an image sensor on an exit side of the lens; Side monitoring device manufacturing method comprising a. The method of claim 16, The providing of the at least one lens may include disposing a first lens having positive refractive power on the output side of the prism, and disposing a second lens having positive refractive power on the emission side of the first lens, And a third lens having a negative refractive power on the exit side of the two lenses. The method of claim 16, And providing an electrical signal obtained by the image sensor to an image processing and display device. The method of claim 17, The refractive index of the first lens is 1.53 manufacturing method of the side. The method of claim 17, The refractive index of the second lens is a manufacturing method of the side monitoring device, characterized in that 1.717. The method of claim 17, The refractive index of the third lens is a manufacturing method of the side monitoring device, characterized in that 1.846.

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