JP2013048754A - Image presenting optical system - Google Patents

Image presenting optical system Download PDF

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JP2013048754A
JP2013048754A JP2011188714A JP2011188714A JP2013048754A JP 2013048754 A JP2013048754 A JP 2013048754A JP 2011188714 A JP2011188714 A JP 2011188714A JP 2011188714 A JP2011188714 A JP 2011188714A JP 2013048754 A JP2013048754 A JP 2013048754A
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image
convex lens
display device
lens system
focal length
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JP5769304B2 (en
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Hisanori Akiyama
久則 秋山
Kazuhiro Omori
和宏 大森
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Topcon Corp
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Topcon Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an image presenting optical system having a simple configuration and presenting a target image with little distortion due to displacement of an eye point.SOLUTION: This image presenting optical system includes: a display device 4 for displaying an image; a reflecting mirror M1 for reflecting a luminous flux from the image that is displayed on the display device 4; a convex lens system L1 for forming a virtual image by the reflection luminous flux reflected from the reflecting mirror M1; and an optical path folding mirror M2 that folds the optical path of the reflection luminous flux that has passed through the convex lens system L1 and presents a virtual image at an image point position O' a prescribed distance ahead of the eye point I of an eye. On the assumption that the focal length f of the convex lens system L1 is larger than 800 mm and the image height of the display device 4 is y mm, the focal length f and the image height y satisfy the following conditional expression: 10y<f<24y. The position of the display screen 4a of the display device 4 is located inward of a focal point f0 of the convex lens system L1.

Description

本発明は、被検眼に検眼用の画像を提示する画像提示光学系の改良に関する。   The present invention relates to an improvement in an image presentation optical system that presents an image for optometry to an eye to be examined.

従来から、被検眼に検眼用画像を提示する画像提示光学系として、筐体の内部に液晶表示装置と、反射ミラーと、ハーフミラーと、凹面鏡とを配設したものが知られている。
その液晶表示装置の表示画面には、検眼用の画像が表示される。
その液晶表示装置の表示画面に表示された検眼用画像からの光束は、反射ミラーによりハーフミラーに向けて反射される。このハーフミラーに導かれた反射光束はこのハーフミラーを透過して凹面鏡に導かれる。 2. Description of the Related Art Conventionally, as an image presentation optical system for presenting an optometric image to an eye to be examined, a liquid crystal display device, a reflection mirror, a half mirror, and a concave mirror are disposed inside a housing.
An image for optometry is displayed on the display screen of the liquid crystal display device.
The light flux from the optometry image displayed on the display screen of the liquid crystal display device is reflected by the reflecting mirror toward the half mirror. The reflected light beam guided to the half mirror passes through the half mirror and is guided to the concave mirror.

この凹面鏡に導かれた反射光束は、この凹面鏡により再びハーフミラーに向けて反射される。その凹面鏡により反射された反射光束は、そのハーフミラーにより被検眼の存在する方向に向けて反射される。そのハーフミラーにより反射された反射光束は、被検眼のアイポイントの前方５ｍの位置に検眼用の画像として虚像を形成する（例えば、特許文献１参照。）。   The reflected light beam guided to the concave mirror is reflected again toward the half mirror by the concave mirror. The reflected light beam reflected by the concave mirror is reflected by the half mirror toward the direction in which the eye to be examined exists. The reflected light beam reflected by the half mirror forms a virtual image as an optometry image at a position 5 m ahead of the eye point of the eye to be examined (see, for example, Patent Document 1).

特開平１１−８９７９６号公報Japanese Patent Laid-Open No. 11-89796

しかしながら、この従来の画像提示光学系は、ハーフミラーと凹面鏡との組み合わせの配置であり、凹面鏡の焦点距離が３００ｍｍよりも短いため、視界が狭くてアイポイントのずれによる画像の歪みの変化が大きい。   However, this conventional image presentation optical system is a combination arrangement of a half mirror and a concave mirror, and since the focal length of the concave mirror is shorter than 300 mm, the field of view is narrow and the change in image distortion due to the deviation of the eye point is large. .

また、凹面鏡やハーフミラーの光学素子の精度を高精度に仕上げなければならず、概してコスト高となる不都合がある。
本発明は、上記の事情に鑑みて為されたもので、単純な光学構成でアイポイントのずれによる画像歪みの少ない画像提示光学系を提供することにある。 In addition, the accuracy of the concave mirror and the optical element of the half mirror must be finished with high accuracy, which generally has a disadvantage of high cost.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an image presentation optical system having a simple optical configuration and less image distortion due to eyepoint displacement.

本発明の特徴は、画像を表示する表示装置と、該表示装置からの光束により虚像を形成する凸レンズ系とを少なくとも備え、前記凸レンズ系はその焦点距離ｆが８００ミリメートルよりも大きく、かつ、前記表示装置の像高をｙミリメートルとして、前記焦点距離ｆと前記像高ｙとが、１０ｙ＜ｆ＜２４ｙの条件式を満足するものであり、前記表示装置の表示画面の位置が前記凸レンズ系の焦点距離以内にあることを特徴とする。   A feature of the present invention is that it includes at least a display device that displays an image and a convex lens system that forms a virtual image by a light beam from the display device, and the convex lens system has a focal length f greater than 800 millimeters, and When the image height of the display device is y millimeters, the focal length f and the image height y satisfy the conditional expression of 10y <f <24y, and the position of the display screen of the display device is that of the convex lens system. It is within the focal length.

本発明によれば、凸レンズ系の焦点距離を長くしたので、単純な光学構成でアイポイントのずれによる画像歪みの少ない画像提示光学系を提供できる。また、視界の広い画像歪みの少ない画像提示光学系を提供できる。   According to the present invention, since the focal length of the convex lens system is increased, it is possible to provide an image presentation optical system with a simple optical configuration and less image distortion due to eye point deviation. In addition, it is possible to provide an image presentation optical system having a wide field of view and less image distortion.

図１は本発明に係る画像提示光学系を用いた視力表示装置の一例を示す斜視図である。FIG. 1 is a perspective view showing an example of a visual acuity display device using an image presentation optical system according to the present invention. 図２は本発明に係る画像提示光学系の一例を示す光学系の構成図である。FIG. 2 is a configuration diagram of an optical system showing an example of an image presentation optical system according to the present invention. 図３は図２に示す表示装置の表示画面に表示された画像の一例を示す説明図である。FIG. 3 is an explanatory diagram showing an example of an image displayed on the display screen of the display device shown in FIG. 図４は本発明に係る画像提示光学系の他の例を示す光学系の構成図である。FIG. 4 is a configuration diagram of an optical system showing another example of the image presentation optical system according to the present invention.

以下に、図１ないし図４を参照しつつ本発明に係る画像提示光学系を用いた視力表示装置の実施例を図面を参照しつつ説明する。
図１は本発明に係る画像提示光学系を内蔵する視力表示装置の一例を示す斜視図である。 Hereinafter, an embodiment of a visual acuity display device using an image presentation optical system according to the present invention will be described with reference to the drawings with reference to FIGS.
FIG. 1 is a perspective view showing an example of a visual acuity display device incorporating an image presentation optical system according to the present invention.

その図１において、１は支持台であり、２は筐体である。筐体２は支持台１の上部に配設される。ここでは、支持台１と筐体２とは一体化されて視力装置の本体を構成している。筐体２の前面にはウインドウWが設けられている。このウインドウWには、ここでは、ポリアクリルレート樹脂（PMMA）が用いられ、その厚さは２ｍｍである。   In FIG. 1, 1 is a support base, and 2 is a housing. The housing 2 is disposed on the upper portion of the support base 1. Here, the support base 1 and the housing 2 are integrated to form a main body of the vision device. A window W is provided on the front surface of the housing 2. Here, a polyacrylate resin (PMMA) is used for the window W, and its thickness is 2 mm.

その支持台１と筐体２とからなる本体の内部には、画像提示光学系３が設けられている。この画像提示光学系３は、図２に示すように、表示装置４と、反射ミラーM１と、凸レンズ系L1と、光路折り曲げミラーM２とが設けられている。   An image presentation optical system 3 is provided inside the main body including the support 1 and the housing 2. As shown in FIG. 2, the image presentation optical system 3 is provided with a display device 4, a reflection mirror M1, a convex lens system L1, and an optical path bending mirror M2.

表示装置４は、例えば、液晶ディスプレイから構成され、物点Oの位置に存在する表示画面４aに図３に示すようにランドルト環等の検眼用の画像を表示する。その図３において、ｙは像高を示す。
反射ミラーM1はこの表示装置４に表示された画像からの光束を凸レンズ系L1に向けて反射する。 The display device 4 is composed of a liquid crystal display, for example, and displays an image for optometry such as a Landolt ring as shown in FIG. 3 on a display screen 4a existing at the position of the object point O. In FIG. 3, y indicates the image height.
The reflection mirror M1 reflects the light beam from the image displayed on the display device 4 toward the convex lens system L1.

凸レンズ系L1は、ここでは、１個の凸レンズにより構成されている。この凸レンズにはBK７等のガラス材料が用いられている。この凸レンズ系L１の焦点距離ｆは、ここでは、ｆ＝１１５７．７ｍｍ（ミリメートル）である。その図２において、符号ｆ０は凸レンズ系L1の焦点を示している。物点Oは凸レンズ系L1の焦点距離以内にある。
この凸レンズ系L1は、反射ミラーM1により反射された反射光束により虚像を形成する。 Here, the convex lens system L1 is constituted by one convex lens. A glass material such as BK7 is used for this convex lens. Here, the focal length f of the convex lens system L1 is f = 1157.7 mm (millimeters). In FIG. 2, the symbol f0 indicates the focal point of the convex lens system L1. The object point O is within the focal length of the convex lens system L1.
The convex lens system L1 forms a virtual image by the reflected light beam reflected by the reflecting mirror M1.

光路折り曲げミラーM2は、凸レンズ系L１を透過した反射光束の光路を折り曲げて眼のアイポイントIの前方の所定距離の像点位置に虚像を提示する。
ここでは、凸レンズ系L1の焦点距離ｆは、ｆ＝１１５７．７ｍｍとされている。しかしながら、凸レンズ系L１の焦点距離ｆは８００ｍｍ（ミリメートル）よりも大きければ、表示装置４の表示画面４aに表示された画像の歪みを小さくできる。 The optical path bending mirror M2 bends the optical path of the reflected light beam that has passed through the convex lens system L1, and presents a virtual image at an image point position at a predetermined distance in front of the eye point I of the eye.
Here, the focal length f of the convex lens system L1 is f = 1157.7 mm. However, if the focal length f of the convex lens system L1 is greater than 800 mm (millimeters), the distortion of the image displayed on the display screen 4a of the display device 4 can be reduced.

また、表示装置４の像高ｙと焦点距離ｆとの関係は、１０ｙ＜ｆ＜２４ｙであるのが望ましい。
ライカ版の大きさの液晶ディスプレイから１４インチ相当のサイズのテレビ画面等に表示された画像を被検眼に提示する場合でも、画像歪みを小さくして提供できるからである。 The relationship between the image height y and the focal length f of the display device 4 is preferably 10y <f <24y.
This is because even when an image displayed on a television screen or the like having a size equivalent to 14 inches is presented to the subject's eye from a liquid crystal display of a Leica size, it can be provided with reduced image distortion.

下記の表１は、その図２に示す画像提示光学系の光学データを示している。
この表１において、符号Oは物点の位置、面番号１は反射ミラーM１の面、面番号２は凸レンズ系L１の後面、面番号３は凸レンズ系L１の前面、面番号４は光路折り曲げミラーM２の面、面番号５はウインドウWの内面、面番号６はウインドウWの外面、Iはアイポイント、O’は虚像が形成される像点位置を示す。 Table 1 below shows optical data of the image presentation optical system shown in FIG.
In Table 1, the symbol O is the position of the object point, the surface number 1 is the surface of the reflecting mirror M1, the surface number 2 is the rear surface of the convex lens system L1, the surface number 3 is the front surface of the convex lens system L1, and the surface number 4 is the optical path bending mirror. Surface M2, surface number 5 is the inner surface of window W, surface number 6 is the outer surface of window W, I is the eye point, and O 'is the image point position where the virtual image is formed.

ここでは、物点Oから反射ミラーM１までの面間距離ｄ１は７０ｍｍ、反射ミラーM１の曲率半径ｒ１は無限大、反射ミラーM１の面１から凸レンズ系L１の後面２までの面間距離ｄ２は８１４．８１９ｍｍ、凸レンズ系L１の後面２の曲率半径ｒ２は無限大、凸レンズ１の後面２から凸レンズ系L１の前面３までの面間距離（厚さ）ｄ３は１６ｍｍ、凸レンズ系L１の前面３の曲率半径ｒ３は６００ｍｍ、光路折り曲げミラーM２の面４の曲率半径ｒ４は無限大、凸レンズ系L１の前面３から光路折り曲げミラーM２の面４までの面間距離ｄ４は１５０ｍｍ、光路折り曲げミラーM２の面４からウインドウWの内面５までの面間距離ｄ５は９８．０００ｍｍ、ウインドウWの内面５の曲率半径ｒ５は無限大、ウインドウWの内面５からウインドウWの外面６までの面間距離ｄ６は２ｍｍ、ウインドウWの外面６の曲率半径ｒ６は無限大、ウインドウWの外面６からアイポイントIまでの面間距離ｄ７は８００ｍｍであり、虚像は−５０００．０００ミリメートル（５ｍ）の像点位置O’に提示される。その像高ｙは８２．６ｍｍである。   Here, the distance d1 between the object point O and the reflecting mirror M1 is 70 mm, the radius of curvature r1 of the reflecting mirror M1 is infinite, and the distance d2 between the surface 1 of the reflecting mirror M1 and the rear surface 2 of the convex lens system L1 is 814.88 mm, the radius of curvature r2 of the rear surface 2 of the convex lens system L1 is infinite, the inter-surface distance (thickness) d3 from the rear surface 2 of the convex lens 1 to the front surface 3 of the convex lens system L1 is 16 mm, and the front surface 3 of the convex lens system L1. The radius of curvature r3 is 600 mm, the radius of curvature r4 of the surface 4 of the optical path bending mirror M2 is infinite, the inter-surface distance d4 from the front surface 3 of the convex lens system L1 to the surface 4 of the optical path bending mirror M2 is 150 mm, and the surface of the optical path bending mirror M2 The distance d5 between 4 and the inner surface 5 of the window W is 98.000 mm, the radius of curvature r5 of the inner surface 5 of the window W is infinite, and the distance between the inner surface 5 of the window W and the outer surface 6 of the window W is The inter-surface distance d6 is 2 mm, the radius of curvature r6 of the outer surface 6 of the window W is infinite, the inter-surface distance d7 from the outer surface 6 of the window W to the eye point I is 800 mm, and the virtual image is −5000.000 millimeters (5 m) Is presented at the image point position O ′. Its image height y is 82.6 mm.

凸レンズ系L１は、図４に示すように、２枚の凸レンズL１’、L１”から構成しても良い。
下記の表２は、その図３に示す画像提示光学系の光学データを示している。
この実施例では、物点Oから反射ミラーM１の面１までの面間距離ｄ１は６５ｍｍ、反射ミラーM1のミラー面１の曲率半径ｒ１は無限大、反射ミラーM１の面１から凸レンズ系L１の凸レンズL１’の後面２までの面間距離ｄ２は、７９１．５００ｍｍ、凸レンズL１’の後面２の曲率半径ｒ２は−４５４．２２６５ｍｍ、凸レンズL１’の後面２から凸レンズL1’の前面３までの面間距離ｄ３は、３５．０００ｍｍ、凸レンズL１’の前面３の曲率半径ｒ３は、４５４．２２６５ｍｍ、凸レンズL１’の前面３から凸レンズL１”の後面４までの面間距離ｄ４は５ｍｍ、凸レンズL１”の後面４の曲率半径ｒ４は４５４．２２６５ｍｍ、凸レンズL１”の後面４から凸レンズL１”の前面５までの面間距離ｄ５は５ｍｍ、凸レンズL１”の前面５の曲率半径ｒ５は無限大、凸レンズL１”の前面５から光路折り曲げミラーM２の面６までの面間距離ｄ６は１５０ｍｍ、光路折り曲げミラーM２の面６の曲率半径ｒ６は無限大、光路折り曲げミラーM２の面６からウインドウWの内面７までの面間距離ｄ７は９８ｍｍ、ウインドウWの内面７の曲率半径ｒ７は無限大、ウインドウWの内面７からウインドウWの外面８までの面間距離ｄ８は２ｍｍ、ウインドウWの外面８の曲率半径ｒ８は無限大、ウインドウWの外面８からアイポイントIまでの面間距離ｄ９は８００ｍｍであり、虚像は−５０００．０００ミリメートルの像点位置O’に提示される。
この凸レンズ系L１の焦点距離ｆは１０７５．８ｍｍであり、像高ｙは４８．８ｍｍである。 The convex lens system L1 may be composed of two convex lenses L1 ′ and L1 ″ as shown in FIG.
Table 2 below shows optical data of the image presentation optical system shown in FIG.
In this embodiment, the distance d1 between the object point O and the surface 1 of the reflecting mirror M1 is 65 mm, the radius of curvature r1 of the mirror surface 1 of the reflecting mirror M1 is infinite, and from the surface 1 of the reflecting mirror M1 to the convex lens system L1. The inter-plane distance d2 to the rear surface 2 of the convex lens L1 ′ is 791.500 mm, the radius of curvature r2 of the rear surface 2 of the convex lens L1 ′ is −454.2265 mm, and the surface from the rear surface 2 of the convex lens L1 ′ to the front surface 3 of the convex lens L1 ′. The distance d3 is 35.000 mm, the radius of curvature r3 of the front surface 3 of the convex lens L1 ′ is 454.2265 mm, the distance d4 between the front surface 3 of the convex lens L1 ′ and the rear surface 4 of the convex lens L1 ″ is 5 mm, and the convex lens L1 ″. The radius of curvature r4 of the rear surface 4 is 454.2265 mm, the inter-surface distance d5 from the rear surface 4 of the convex lens L1 ″ to the front surface 5 of the convex lens L1 ″ is 5 mm, and the radius of curvature r5 of the front surface 5 of the convex lens L1 ″ is infinite. The distance d6 between the front surface 5 of the convex lens L1 "and the surface 6 of the optical path bending mirror M2 is 150 mm, the radius of curvature r6 of the surface 6 of the optical path bending mirror M2 is infinite, and the inner surface of the window W from the surface 6 of the optical path bending mirror M2 The distance d7 between the surfaces up to 7 is 98 mm, the radius of curvature r7 of the inner surface 7 of the window W is infinite, the distance d8 between the inner surface 7 of the window W and the outer surface 8 of the window W is 2 mm, and the curvature of the outer surface 8 of the window W The radius r8 is infinite, the inter-plane distance d9 from the outer surface 8 of the window W to the eye point I is 800 mm, and the virtual image is presented at the image point position O ′ of −500.000 millimeters.
The focal length f of this convex lens system L1 is 1075.8 mm, and the image height y is 48.8 mm.

この図４に示す画像提示光学系によれば、被検眼に提示される画像に対して色消し効果がある。
以上、実施例について説明したが、本発明に係る画像提示光学系は、画像を表示する表示装置４と、この表示装置４からの光束により虚像を形成する凸レンズ系L1とを少なくとも備えていれば成り立つものである。
また、実施例に係る画像提示光学系によれば、支持台１の内部に画像提示光学系の光学要素の一部を配設することにしたので、省スペース化を図ることができる。 The image presentation optical system shown in FIG. 4 has an achromatic effect on the image presented to the eye to be examined.
Although the embodiments have been described above, the image presentation optical system according to the present invention has at least the display device 4 that displays an image and the convex lens system L1 that forms a virtual image by the light flux from the display device 4. It holds.
In addition, according to the image presentation optical system according to the embodiment, since a part of the optical elements of the image presentation optical system is arranged inside the support base 1, space saving can be achieved.

ｆ０…焦点
M1…反射ミラー
M２…光路折り曲げミラー
L１…凸レンズ系
I…アイポイント
ｆ…焦点距離
４…表示装置
４a…表示画面 f0: Focus
M1 ... reflection mirror
M2 ... Optical path bending mirror
L1 ... Convex lens system
I ... Eye point f ... Focal length 4 ... Display device 4a ... Display screen

Claims (2)

画像を表示する表示装置と、該表示装置からの光束により虚像を形成する凸レンズ系とを少なくとも備え、前記凸レンズ系はその焦点距離ｆが８００ミリメートルよりも大きく、かつ、前記表示装置の像高をｙミリメートルとして、前記焦点距離ｆと前記像高ｙとが、１０ｙ＜ｆ＜２４ｙの条件式を満足するものであり、前記表示装置の表示画面の位置が前記凸レンズ系の焦点距離以内にあることを特徴とする画像提示光学系。   At least a display device that displays an image and a convex lens system that forms a virtual image by a light beam from the display device, the convex lens system having a focal length f larger than 800 millimeters and an image height of the display device The focal length f and the image height y satisfy the conditional expression 10y <f <24y as y millimeters, and the position of the display screen of the display device is within the focal length of the convex lens system. An image presentation optical system. ウインドウを有する筐体と該筐体を支持する支持台とからなる本体の内部に、画像を表示する表示装置と、該表示装置に表示された画像からの光束を反射する反射ミラーと、該反射ミラーにより反射された反射光束により虚像を形成する凸レンズ系と、該凸レンズ系を通過した反射光束の光路を折り曲げて眼のアイポイントの前方の所定距離の位置に前記虚像を提示する光路折り曲げミラーとが設けられ、前記凸レンズ系はその焦点距離ｆが８００ミリメートルよりも大きく、かつ、前記表示装置の像高をｙミリメートルとして、前記焦点距離ｆと前記像高ｙとが、１０ｙ＜ｆ＜２４ｙの条件式を満足するものであり、前記表示装置の表示画面の位置が前記凸レンズ系の焦点距離以内にあることを特徴とする画像提示光学系。   A display device that displays an image, a reflection mirror that reflects a light beam from the image displayed on the display device, and a reflection mirror that is included in a main body that includes a housing having a window and a support that supports the housing. A convex lens system that forms a virtual image with a reflected light beam reflected by the mirror, and an optical path bending mirror that folds the optical path of the reflected light beam that has passed through the convex lens system and presents the virtual image at a predetermined distance in front of the eye point of the eye; The focal length f of the convex lens system is greater than 800 millimeters, the image height of the display device is y millimeters, and the focal length f and the image height y satisfy 10y <f <24y. An image presentation optical system satisfying a conditional expression, wherein a position of a display screen of the display device is within a focal length of the convex lens system.
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