JPH05256948A - Detecting apparatus of distance between vehicles - Google Patents

Detecting apparatus of distance between vehicles

Info

Publication number
JPH05256948A
JPH05256948A JP4053182A JP5318292A JPH05256948A JP H05256948 A JPH05256948 A JP H05256948A JP 4053182 A JP4053182 A JP 4053182A JP 5318292 A JP5318292 A JP 5318292A JP H05256948 A JPH05256948 A JP H05256948A
Authority
JP
Japan
Prior art keywords
vehicle
windshield
film
laser light
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4053182A
Other languages
Japanese (ja)
Other versions
JP2976679B2 (en
Inventor
Hirochika Miyakoshi
博規 宮越
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP4053182A priority Critical patent/JP2976679B2/en
Publication of JPH05256948A publication Critical patent/JPH05256948A/en
Application granted granted Critical
Publication of JP2976679B2 publication Critical patent/JP2976679B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To prevent the reflection of a laser light at a windshield in a vehicle distance detecting apparatus which measures the distance to a vehicle running ahead by means of the laser light from a laser radar device set at a predetermined position within a vehicle. CONSTITUTION:An Al2O3 film 20 of lambda/4 thickness, a ZrO2 film 22 of lambda/2 thickness and an MgF2 film 24 of lambda/4 thickness are sequentially deposited as a non- reflecting coating film on a windshield 11. In consequence, the reflectivity of the laser light of wavelength is decreased to approximately 0%, so that the noises due to the light reflected at the windshield 11 and reflected at an instrument panel within the vehicle are reduced. The measuring accuracy of the distance is improved owing to the improvement of the power of the emitted laser light.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は車間距離検出装置、特に
車室内に設けられたレーザレーダ装置を用いる車間距離
検出装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-vehicle distance detecting device, and more particularly to an inter-vehicle distance detecting device using a laser radar device provided in a vehicle interior.

【0002】[0002]

【従来の技術】最近、高速道路走行などにおける運転者
の運転操作低減や安全性向上などを目的とし、前方車両
との車間距離を検出しながら自車両の走行を制御するシ
ステムが開発されている。このような走行制御システム
においては、いかに正確に前方車両までの距離を測るか
が最重要課題となっており、このため測距センサに種々
の改良が加えられている。
2. Description of the Related Art Recently, a system has been developed for controlling the traveling of the vehicle while detecting the distance between the vehicle and the vehicle in front for the purpose of reducing the driving operation of the driver and improving safety in traveling on a highway. .. In such a traveling control system, how to accurately measure the distance to the vehicle in front is the most important issue, and therefore various improvements have been made to the distance measuring sensor.

【0003】例えば、特開昭59−24278号公報に
開示された車両用障害物検出装置においては、レーザ光
を発光する発光部と反射光を受光する受光部とを備え、
この発光部と受光部をレーザ光、反射光が共にフロント
ガラスのワイパーの軌道上を通過する車室内の所定位置
に設置する構成が示されている。このようにフロントガ
ラスのワイパの軌道上を通過する車室内の所定位置に設
置することによって、埃や泥などにより光の送受部分が
汚れるのを取り去り、性能低下を起すことなく前方車両
を検知することができる。
For example, a vehicle obstacle detection device disclosed in Japanese Patent Laid-Open No. 59-24278 includes a light emitting section for emitting laser light and a light receiving section for receiving reflected light.
A configuration is shown in which the light emitting portion and the light receiving portion are installed at predetermined positions in the vehicle compartment where both the laser light and the reflected light pass on the track of the windshield wiper. By installing the windshield wiper at a predetermined position in the passenger compartment that passes through the orbit of the windshield in this way, it removes dirt from the light transmitting / receiving part due to dust, mud, etc., and detects the front vehicle without degrading performance. be able to.

【0004】また、実開平1−154486号公報に開
示された車両用監視装置においては、フロントガラスの
うち赤外線撮像カメラの赤外線の透過領域に開口部を開
設し、この開口部に赤外線透過材で形成した赤外線透過
窓を嵌装する構成が示されている。このように、赤外線
透過窓をフロントガラスの所定位置に嵌装することによ
り、赤外線を良好に受光し、前方車両像を明瞭に得るこ
とができる。
Further, in the vehicle monitoring device disclosed in Japanese Utility Model Laid-Open No. 1-154486, an opening is formed in the infrared transmitting area of the infrared imaging camera of the windshield, and the infrared transmitting material is used in the opening. The configuration in which the formed infrared transmitting window is fitted is shown. As described above, by fitting the infrared transmitting window at a predetermined position on the windshield, infrared rays can be properly received and a front vehicle image can be clearly obtained.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、発光部
及び受光部をフロントガラスのワイパーの軌道上を通過
する車室内の所定位置に設置する構成では、以下のよう
な問題が生じてしまう。すなわち、図3に示されるよう
に発光部と受光部からなるセンサ10から射出したレー
ザ光はフロントガラスに達し、一部は外部に透過する
が、その一部はフロントガラス表面で反射し車室内のイ
ンストルメントパネル12に達する。すると、レーザ光
はこのインストルメントパネル12あるいはこのインス
トルメントパネル12上に載置された物体(例えば道路
地図など)によって反射され、再びセンサ10の受光部
に入射してしまう。このようなインストルメントパネル
12により反射された光はセンサ10にとってはノイズ
の原因となり、測距精度を低下させる一因となってい
た。
However, in the structure in which the light emitting portion and the light receiving portion are installed at predetermined positions in the passenger compartment passing through the track of the windshield wiper, the following problems occur. That is, as shown in FIG. 3, the laser light emitted from the sensor 10 including the light emitting portion and the light receiving portion reaches the windshield and a part of the laser light is transmitted to the outside, but a part of the laser light is reflected on the windshield surface and is reflected in the vehicle interior. To the instrument panel 12 of. Then, the laser light is reflected by the instrument panel 12 or an object (for example, a road map) placed on the instrument panel 12 and is incident on the light receiving portion of the sensor 10 again. The light reflected by the instrument panel 12 causes noise for the sensor 10 and is one of the causes for reducing the ranging accuracy.

【0006】また、赤外線透過窓をフロントガラスに嵌
装する構成では、従来のフロントガラスに比べてその強
度が低下してしまうと共に、嵌装部からの水洩れの可能
性が生じ、さらには美観を損ねてしまう問題があった。
Further, in the structure in which the infrared transmitting window is fitted to the windshield, the strength thereof is lower than that of the conventional windshield, and there is a possibility of water leakage from the fitting portion. There was a problem that damages.

【0007】本発明は上記従来技術を有する課題に鑑み
なされたものであり、その目的はフロントガラスの強度
や美観などを何ら損ねることなく測距精度を向上させる
ことが可能な車間距離検出装置を提供することにある。
The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an inter-vehicle distance detecting device capable of improving distance measuring accuracy without impairing the strength and aesthetics of the windshield. To provide.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
に、本発明に係る車間距離検出装置は、レーザレーダ装
置からのレーザ光が透過するフロントガラスの車室内側
にレーザ光の波長に応じた厚さを有し、フロントガラス
側から室内側に順次Al2 3 、ZrO2 、MgF2
少なくとも3層のコーティング膜を設けることを特徴と
する。
In order to achieve the above object, an inter-vehicle distance detecting apparatus according to the present invention is arranged on the inside of a windshield through which a laser beam from a laser radar device is transmitted, depending on the wavelength of the laser beam. And a coating film of at least three layers of Al 2 O 3 , ZrO 2 , and MgF 2 is sequentially provided from the windshield side to the indoor side.

【0009】[0009]

【作用】本発明の車間距離検出装置はこのような構成を
有しており、レーザレーダ装置からのレーザ光が透過す
るフロントガラスの所定領域にこのレーザ光の反射を抑
止する無反射コーティング膜を形成することにより、レ
ーザ光のインストルメントパネルへの反射を抑え、受光
部への再入射を防止してノイズ低下を図るものである。
The inter-vehicle distance detecting device of the present invention has such a structure, and a non-reflective coating film for suppressing the reflection of the laser light is provided in a predetermined region of the windshield through which the laser light from the laser radar device is transmitted. By forming it, the reflection of laser light on the instrument panel is suppressed, re-incident on the light receiving portion is prevented, and noise is reduced.

【0010】なお、この無反射コーティング膜は車室内
側に蒸着乃至貼付されることにより形成されるため、フ
ロントガラスの強度や美観に影響を与えることなく、測
距精度向上を図ることができる。
Since this non-reflective coating film is formed by vapor deposition or pasting on the inside of the vehicle compartment, the accuracy of distance measurement can be improved without affecting the strength and aesthetics of the windshield.

【0011】[0011]

【実施例】以下、図面を用いながら本発明に係る車間距
離検出装置の好適な実施例を説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an inter-vehicle distance detecting apparatus according to the present invention will be described below with reference to the drawings.

【0012】全体構成は図3に示された構成とほぼ同様
であり、センサ10が車室内の所定位置、例えばレーザ
光がワイパーの軌道上を通過する位置に設けられる。こ
こで、本実施例において特徴的なことはレーザ光が透過
するフロントガラス11の車室内側に無反射コーティン
グ膜を形成した点である。
The overall structure is almost the same as that shown in FIG. 3, and the sensor 10 is provided at a predetermined position in the vehicle compartment, for example, at a position where the laser beam passes on the track of the wiper. Here, a characteristic of this embodiment is that a non-reflection coating film is formed on the inside of the windshield 11 through which the laser light passes.

【0013】図1には本実施例における無反射コーティ
ング膜の構成が示されている。フロントガラス11から
順次Al2 3 金属酸化膜20、ZrO2 金属酸化膜2
2、MgF2 金属膜24が蒸着形成される。各膜の膜厚
はセンサ10から射出されるレーザ光の波長λ(本実施
例においてはλ=0.85μm)に応じて定められ、A
2 3 膜はλ/4、ZrO2 膜22はλ/2、MgF
2 膜24はλ/4に設定される。
FIG. 1 shows the structure of the antireflection coating film in this embodiment. The Al 2 O 3 metal oxide film 20 and the ZrO 2 metal oxide film 2 are sequentially arranged from the windshield 11.
2. The MgF 2 metal film 24 is formed by vapor deposition. The film thickness of each film is determined according to the wavelength λ of the laser light emitted from the sensor 10 (λ = 0.85 μm in this embodiment), and A
l 2 O 3 film is λ / 4, ZrO 2 film 22 is λ / 2, MgF
2 The film 24 is set to λ / 4.

【0014】光学の分野において周知の如く、屈折率n
g のガラス上に順次屈折率がn3 の物質をλ/4、屈折
率がn2 の物質をλ/2、屈折率がn1 の物質をλ/4
形成した場合、n1 2 g =n3 2 の条件を満足すると
きは、n2 がいかなる値であっても入射光(波長λ)に
対して反射率が0になることが知られている。
As is well known in the field of optics, the refractive index n
On a glass of g , a substance having a refractive index of n 3 is λ / 4, a substance having a refractive index of n 2 is λ / 2, and a substance having a refractive index of n 1 is λ / 4.
When formed, when the condition of n 1 2 ng = n 3 2 is satisfied, it is known that the reflectance for incident light (wavelength λ) becomes 0 for any value of n 2. There is.

【0015】従って、本実施例のように屈折率1.68
のAl2 3 膜20をλ/4、屈折率2.1のZrO2
膜22をλ/2、屈折率1.38のMgF2 膜24をλ
/4だけフロントガラス11上に順次形成することによ
り、波長λのレーザ光に対する反射率をほぼ0にするこ
とができ、これによりインストルメントパネル12から
の反射光によるノイズを著しく減少することが可能とな
る。
Therefore, as in this embodiment, the refractive index is 1.68.
Al 2 O 3 film 20 of λ / 4, ZrO 2 having a refractive index of 2.1
The film 22 is λ / 2, and the MgF 2 film 24 having a refractive index of 1.38 is λ / 2.
By sequentially forming only / 4 on the windshield 11, the reflectance with respect to the laser light of the wavelength λ can be made almost zero, whereby the noise due to the reflected light from the instrument panel 12 can be significantly reduced. Becomes

【0016】図2にはフロントガラス11に何らコーテ
ィング処理を施さない場合の反射率(図中一点鎖線)、
及び本実施例の無反射コーティング膜を形成したフロン
トガラス11の反射率(図中実線)の波長依存性を示
す。図から明らかなように、波長λ=0.85μmに対
して従来のフロントガラスではほぼ40%あった反射率
が本実施例の無反射コーティング膜が形成されたフロン
トガラスではほぼ0%に低減されており、センサからの
レーザ光を効率良く車室外に射出して測距を行うことが
できることが理解される。
FIG. 2 shows the reflectance when the windshield 11 is not coated at all (dotted line).
Also, the wavelength dependence of the reflectance (solid line in the figure) of the windshield 11 formed with the anti-reflection coating film of this example is shown. As is apparent from the figure, the reflectance of the conventional windshield of about 40% for the wavelength λ = 0.85 μm is reduced to about 0% for the windshield having the antireflection coating film of this embodiment. Therefore, it is understood that the laser light from the sensor can be efficiently emitted to the outside of the passenger compartment to measure the distance.

【0017】このように、本実施例においてはフロント
ガラスの車室内側に無反射コーティング膜を形成するこ
とによりレーザ光の反射を抑えて透過率向上を図るもの
であり、車室外に射出されるレーザ光のパワーを向上さ
せることができると共に、前方車両以外の物体(例えば
インストルメントパネルなど)による反射を抑え、測距
精度を著しく向上させることができる。本実施例の場
合、測距精度が10%乃至20%向上されることを確認
している。
As described above, in this embodiment, the antireflection coating film is formed on the inside of the windshield in the vehicle interior to suppress the reflection of the laser light to improve the transmittance, and the light is emitted outside the vehicle interior. It is possible to improve the power of the laser light, suppress reflection by an object other than the vehicle in front (for example, an instrument panel, etc.), and significantly improve the ranging accuracy. In the case of the present embodiment, it has been confirmed that the ranging accuracy is improved by 10% to 20%.

【0018】なお、本実施例におけるZrO2 膜22は
化学的に極めて安定であり、Al23 膜20の特性劣
化を抑制すると共に、耐久性に極めて優れたMgF2
24との接着性向上をも図っている。
The ZrO 2 film 22 in this embodiment is chemically extremely stable, suppresses the characteristic deterioration of the Al 2 O 3 film 20, and has excellent adhesiveness with the MgF 2 film 24 having excellent durability. We are also trying to improve.

【0019】また、本実施例においては三層構造を示し
たが、本発明は勿論これに限定されるものではなく、例
えばZrO2 22とMgF2 膜24との間にSiO2
CeO2 膜などを積層して反射率の一層の低減及び可視
光の遮断などの機能をもたせることも可能である。
Further, although a three-layer structure is shown in this embodiment, the present invention is not limited to this, for example, a SiO 2 or CeO 2 film between the ZrO 2 22 and the MgF 2 film 24. It is also possible to stack the above to provide further functions such as further reduction of reflectance and blocking of visible light.

【0020】さらに、本実施例においては無反射コーテ
ィング膜を蒸着により形成する場合を示したが、シール
タイプのような蒸着膜をフロントガラスに貼付すること
により無反射コーティング膜を形成しても良い。
Further, although the case where the antireflection coating film is formed by vapor deposition is shown in the present embodiment, the antireflection coating film may be formed by attaching a vapor deposition film such as a seal type to the windshield. ..

【0021】[0021]

【発明の効果】以上説明したように、本発明に係る車間
距離検出装置によれば、車室内の所定位置に設けられた
レーザレーダ装置からのレーザ光のフロントガラスでの
反射を低減し、前方車両までの測距精度の向上を図るこ
とができる。
As described above, according to the inter-vehicle distance detecting device of the present invention, the reflection of the laser beam from the laser radar device provided at the predetermined position in the vehicle interior on the windshield is reduced, and It is possible to improve the accuracy of distance measurement to the vehicle.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の構成を示す断面図である。FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention.

【図2】同実施例における反射率の波長依存性を示すグ
ラフ図である。
FIG. 2 is a graph showing the wavelength dependence of reflectance in the example.

【図3】従来装置の構成説明図である。FIG. 3 is a diagram illustrating the configuration of a conventional device.

【符号の説明】[Explanation of symbols]

10 センサ(レーザレーダ装置) 11 フロントガラス 12 インストルメントパネル 20 Al2 3 膜 22 ZrO2 膜 24 MgF2 10 Sensor (laser radar device) 11 Windshield 12 Instrument panel 20 Al 2 O 3 film 22 ZrO 2 film 24 MgF 2 film

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 車室内に設けられフロントガラスを介し
て前方車両までの距離を測定するレーザレーダ装置を有
する車間距離検出装置であって、 前記レーザレーダ装置からのレーザ光が透過する前記フ
ロントガラスの車室内側に前記レーザ光の波長に応じた
厚さを有し、前記フロントガラス側から室内側に順次A
2 3 、ZrO2 、MgF2 の少なくとも3層のコー
ティング膜を設けることを特徴とする車間距離検出装
置。
1. An inter-vehicle distance detecting device having a laser radar device provided in a vehicle compartment for measuring a distance to a vehicle in front through a windshield, wherein the windshield transmits a laser beam from the laser radar device. Has a thickness corresponding to the wavelength of the laser light on the inside of the vehicle, and the thickness A is sequentially applied from the windshield to the inside of the vehicle.
An inter-vehicle distance detecting device provided with a coating film of at least three layers of l 2 O 3 , ZrO 2 , and MgF 2 .
JP4053182A 1992-03-12 1992-03-12 Inter-vehicle distance detection device Expired - Fee Related JP2976679B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4053182A JP2976679B2 (en) 1992-03-12 1992-03-12 Inter-vehicle distance detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4053182A JP2976679B2 (en) 1992-03-12 1992-03-12 Inter-vehicle distance detection device

Publications (2)

Publication Number Publication Date
JPH05256948A true JPH05256948A (en) 1993-10-08
JP2976679B2 JP2976679B2 (en) 1999-11-10

Family

ID=12935732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4053182A Expired - Fee Related JP2976679B2 (en) 1992-03-12 1992-03-12 Inter-vehicle distance detection device

Country Status (1)

Country Link
JP (1) JP2976679B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013255064A (en) * 2012-06-06 2013-12-19 Denso Corp Reflection reductive on-vehicle camera system
CN109130797A (en) * 2018-08-24 2019-01-04 深圳市速腾聚创科技有限公司 Windshield and automobile

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102888585B (en) * 2012-10-28 2014-11-26 梧州奥卡光学仪器有限公司 Process for producing reflection reducing coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013255064A (en) * 2012-06-06 2013-12-19 Denso Corp Reflection reductive on-vehicle camera system
CN109130797A (en) * 2018-08-24 2019-01-04 深圳市速腾聚创科技有限公司 Windshield and automobile

Also Published As

Publication number Publication date
JP2976679B2 (en) 1999-11-10

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