JPS62150215A - Multi-focus lens - Google Patents

Abstract

PURPOSE:To obtain a multi-focus lens for both long and short distances having an excellent visual field, by using a lens which has a plane of refraction whose refracting power gradually changes in the same way as a gradual multi-focus lens does and, at the same time, a small lens part similar to a double focus lens for short distance, as a base lens. CONSTITUTION:This lens is a lens for spectacles having two planes of refractions facing each other and at least one plane of refraction is composed of a base lens 1 part which has gradually changing surface refracting powers at, at least, one part and is used for long and intermediate distances and a small lens 2 part for short distance. The surface refracting power on a main gazing line AB passing through the optical center O for long distance gradually increases from the point O to a point P as shown in the figure (P and Q represent the boundary of the small lens 2). When the section between the points O and P, in which the refracting power gradually increases, is used, an excellent visual field can be obtained from a far place to a relatively near place even for a person whose visual field adjusting capacity is weak.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明け、主として老視者のｔめの多焦点眼鏡レンズに
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to a t-th multifocal eyeglass lens for presbyopes.

〔発明の概要〕[Summary of the invention]

未発明け、老視者のための遠近両用の２Ｍ隼点レンズに
おいて、その台玉部分を累進多焦膚レンズと同様に表面
屈折力が累進的に変化する表面モ状とし、中間的な距離
の視界を確保するとともに連用部領域から近用部領域へ
（ちるいけ逆に近用部領域から遠用部領域へ）視線？移
したとキの急激な度数変化？緩和するものでちる。In an uninvented 2M falcon lens for bifocals for presbyopes, the base portion is made into a mo-shaped surface in which the surface refractive power changes progressively, similar to a progressive multifocal lens, and an intermediate distance lens is used. Securing the field of view and directing the line of sight from the continuous vision area to the near vision area (on the contrary, from the near vision area to the distance vision area)? A sudden change in the frequency of Ki when transferred? Chill with something that relieves it.

〔従来の技術〕[Conventional technology]

従来の２ｆｉ焦点レンズは、濱３図（α）に示すような
遠方視用の台土の一部に近方祝用の小玉な取り寸け７を
構造シしており、台土も小玉も屈折面ば球面であるもの
が知られていた。第３図（ｂ）は第３１箇□□□）のレ
ンズの主注視線（遠方から近方に視＠シ移すとぎ、眼の
通る経路）ＡＢ上での表面屈折力の変化？示す。この２
重焦点レンズは比較的簡単な構造で、遠方視・近方視と
も明瞭な視野／Ｉ；得られるｈｔ、小玉の境界ｈｔ明確
に現われる之め、外管ｈｔ見苦しかつ次。The conventional 2fi focal lens has a structure with a small bead size 7 for close-up viewing on a part of the base for far vision, as shown in Figure 3 (α), and both the base and the small bead are It was known that the refractive surface was a spherical surface. Figure 3 (b) shows the change in the surface refractive power on the main line of gaze (the path taken by the eye when moving from far to near) AB of the lens in item 31 □□□)? show. This 2
The heavy focus lens has a relatively simple structure and provides a clear field of vision for both distance and near vision; the outer tube is unsightly, and the boundary between the beads appears clearly.

そこで、嬉４叉（ｂ）に示すように連用部から近用部に
かけて累進的に度数Ｃ表面屈折力）シ変化させた、一般
に累進多焦点レンズと呼ばれる境界の無い遠近両用レン
ズ（＠４図（α））が開発され友。Therefore, as shown in Fig. 4 (b), a bifocal lens without a boundary, generally called a progressive multifocal lens (@Fig. (α)) has been developed.

〔発明ｈ′−解決しようとする問題点〕従来の２重焦点
ンンズけ、遠用部領域と近用部領域しかなく、中間視は
眼球の調整力にたよらざるを得なかったが、これは調整
力の弱まった老視者にとっては困難でｂった。また、累
進多焦点レンズはと述の中間視の問題を解決しているが
、屈折面ｈ；複雑な曲面形状である次め、第５図に示す
ように非点収差ｈ”＝広く分布し、良好な視界の妨げと
なる。（図中の数字は非点収差〔単位はディオブトリー
〕シ示す）この影響は遠用部度数と近用部度数の差（以
下では加入ソと呼ぶ）ｈ１大芦いｔｌど顕著に工μｈれ
、累進多焦点レンズの製造範囲を制限する原因となって
いた。[Invention h' - Problem to be solved] Conventional bifocal lenses only have distance and near vision areas, and intermediate vision has to depend on the adjustment power of the eyeballs. This was difficult for presbyopes with weakened coordination. In addition, progressive multifocal lenses solve the problem of intermediate vision mentioned above, but the refractive surface h has a complex curved shape, and astigmatism h'' = widely distributed, as shown in Figure 5. (The numbers in the figure indicate astigmatism [unit: dioptres]) This effect is caused by the difference between the distance power and the near power (hereinafter referred to as the addition). However, the manufacturing process has been significantly increased, which has been a cause of limiting the range of production of progressive multifocal lenses.

そこで本発明は前記２種類の従来レンズの問題点？解決
するもので、良好な視野なもつ遠近両用多焦点レンズな
提供することな目的とする。Therefore, the present invention solves the problems of the above two types of conventional lenses. The objective is to provide a bifocal lens with a good field of vision.

〔間落点を解決する几めの手段〕[Elaborate means to resolve gaps]

本発明の多焦点レンズは、金玉として累進多焦点レンズ
と同様に累進的に屈折力の変化する屈折面を持ち、かつ
近用部として２重焦点レンズと同様な小玉部分な持つこ
とな特徴とする。The multifocal lens of the present invention has a refractive surface as a gold ball whose refractive power changes progressively like a progressive multifocal lens, and has a small bead part as a near vision part similar to a bifocal lens. do.

〔実施例〕〔Example〕

第１図Ｃａ）Ｆ！１本発明の多焦点レンズの第１の実施
例を示す。１および２けそれぞれ、金玉、小玉な表わし
ている。遠用部の光学中心０を通る主注視線ＡＢ上での
表面屈折力の変化をｌＥ１図の）に示す。Ｐ、Ｑけ小玉
の境界Ｉｋ表わす。従来の２重焦点レンズ（第３図れ）
、（ｂ））と大きく違う事は、０からＰにかけて！！百
屈折力が累進的に増加していることである。ＤＩは加入
度、伽は中間加入度な表わしている。Figure 1 Ca) F! 1 A first embodiment of a multifocal lens according to the present invention will be shown. The digits 1 and 2 represent gold balls and small balls, respectively. The change in surface refractive power on the main line of gaze AB passing through the optical center 0 of the distance portion is shown in Figure 1E1). P, Q represents the boundary Ik of small beads. Conventional bifocal lens (Figure 3)
, (b)) is significantly different from 0 to P! ! The refractive power increases progressively. DI represents addition, and KA represents intermediate addition.

第２図は、本発明の第２の実施例を示す。小玉の形状が
円形であることな除けば、ＷＸｌの実施例と太き（異な
るところは無い。主注視線上の屈折力の変化は第１図（
ｂ）のものと同じである。FIG. 2 shows a second embodiment of the invention. Except for the shape of the small bead being circular, there is no difference in thickness from the WXl example.The change in refractive power on the main gaze line is shown in Figure 1 (
It is the same as b).

第６図および第７図は本発明の多焦点レンズの非点収差
分布を示す。第６図は、加入度＋５〔Ｄ〕中間加入度＋
２〔Ｄ〕のレンズ、＄７図は加入度＋Ｓ　〔Ｄ）　、中
間加入度＋１〔Ｄ〕のものである。6 and 7 show the astigmatism distribution of the multifocal lens of the present invention. Figure 6 shows addition +5 [D] intermediate addition +
2 [D] lens, the figure $7 has an addition power of +S [D] and an intermediate addition power of +1 [D].

〔発明の効果〕〔Effect of the invention〕

本発明によれば、屈折力ｈ；累進的に増加している０２
間の部分を使うことによって、調整力の弱い人でも遠方
から比較的近くまで良好な視野が連続的に得られる。According to the invention, refractive power h; progressively increasing 02
By using the area in between, even people with weak coordination can continuously obtain good vision from far to relatively close.

第５図は従来の累進多焦点レンズの非点収差図で、−例
として加入度＋３〔Ｄ〕のものな示し念。FIG. 5 is an astigmatism diagram of a conventional progressive multifocal lens, with an example of an addition power of +3 [D].

従来の累進多焦点レンズでは、このように非点収差ｈＳ
広く分布し、遠用部の視野を広くすると近用部が狭（な
り、近用部？広げると遠用部が狭くなって、全領域に渡
って広く良好な視野を確梶することは困難であり之。第
６図に本発明の多焦点レンズの非点収差図な示す。従来
のものと比較するために、加入度＋３〔Ｄ〕、中間加入
度＋２〔Ｄ〕とし友。箪５図と較べると明らかに非点収
差Ｉ！Ｉ；少ない一吉を小玉の部分は球面であるため一
祈用部仝域に渡って非点収差はほとんど無く、従来の累
進多焦点レンズよりかなり広く良好な近方視野が得られ
る。さちに、小玉部分と台玉部分は独立に設計できるた
め、前述したような近用部を広げる九めに遠用部シ狭く
する必要は無い。いいかえれば可能な限り遠用部を広く
しても、小玉の部分で近用部領域は確保できる。In conventional progressive multifocal lenses, astigmatism hS
It is widely distributed, and when the distance vision area is widened, the near vision area becomes narrow (and when the near vision area is widened, the distance vision area becomes narrower, making it difficult to ensure a wide and good field of vision over the entire area. Figure 6 shows the astigmatism diagram of the multifocal lens of the present invention.For comparison with the conventional lens, the addition power is +3 [D] and the intermediate addition power is +2 [D]. Compared to the figure, there is clearly astigmatism I! Excellent near vision can be obtained.Also, since the small lens part and the base lens part can be designed independently, there is no need to widen the near vision part and narrow the distance vision part as mentioned above.In other words, it is possible. Even if the distance vision area is made as wide as possible, the near vision area can be secured with the small beads.

第７図は、中間加入度ｆ　＋　１　〔Ｄ）とし九本発明
の多焦点レンズの非膚収差図？示す。一般に充分な遠方
視ので禽る累進レンズを股、計する場合、加入度と同程
度の大きさの非点収差／′１；レンズの側方に発生する
。一方、非点収差が第１”Ｄ）　？上まわる部分けぼけ
を強く感じる几め、使用に適さないと言われている。従
って、本発明のこの実施例では中間加入度？＋　１　〔
、Ｄ）以下に抑えることにより、金玉の部分での非点収
差が１ＣＤ〕以下となり、はぼ全域にわたって使用ｈ；
可能となる。FIG. 7 is a non-skin aberration diagram of the multifocal lens of the present invention with intermediate addition power f + 1 [D]. show. In general, when measuring a progressive lens that provides sufficient distance vision, astigmatism (/'1) of approximately the same magnitude as the addition power occurs on the sides of the lens. On the other hand, it is said that if the astigmatism is 1"D), the partial blurring is felt strongly, and it is not suitable for use.Therefore, in this embodiment of the present invention, the intermediate addition power is +1 [
, D) By suppressing the astigmatism at the ball part to 1CD or less, the astigmatism can be used over the entire area.
It becomes possible.

以上のように本発明は金玉と小玉によって構成される２
重焦点レンズに、屈折力が累進的に変化する中間部領斌
な設は几ことにより、広く良好な視野な確併し友まネ、
中間視が容易にできる多焦点レンズシ提供するものであ
る。As described above, the present invention consists of two balls composed of gold balls and small balls.
By carefully setting the middle part of the heavy focus lens where the refractive power changes progressively, you can ensure a wide and good field of view.
To provide a multifocal lens that facilitates intermediate vision.

木実雄側では、表面屈折力が累進的に変化する部分け、
白玉の光学中心と小玉の間に有るものでちったｆ１″−
１このことば本発明の必須条件ではなく白玉の光学中心
以外の点と小玉の間で上記の表面屈折力の変化Ｍ”＝　
Ｄ）ってもよい。On the Kimino side, there is a part where the surface refractive power changes progressively,
f1″-, which is between the optical center of the white ball and the small ball.
1 This term is not an essential condition of the present invention, but the above change in surface refractive power between a point other than the optical center of the white ball and the small ball M''=
D) may be done.

上述の説明では、小玉部分は球面であるとし之ｈ；、非
球面であってもかまｈない。In the above description, the small ball portion is assumed to be spherical; however, it may be aspherical.

市た。小玉と白玉の境界が明瞭でなく、ぼかされている
ものも本発明に含まれる。City. The present invention also includes those in which the boundaries between small balls and white balls are not clear and are blurred.

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

第１図は、未発明の多焦点レンズの正面図（ロ））と主
注視線上の屈折力変化図（ｂ）。 第２図は、第２の実施例である多焦点レンズの正面図。 第３図は、従来の２重態点レンズの正面図れ）と主注視
線上の屈折力変化図（ｈ）、。 第４図は、従来の累進多焦点レンズの正面図（ハ））と
主注視線上の屈折力変化図（ｂ）。 第５図は、従来の累進多焦点レンズの非点収差図。 第６図、第７図は本発明の多体点レンズの非点収差図。 ＡＢ・・・・・・主注視線 ０・・・・・・遠用光学中心 Ｐ、　Ｑ・・・・・・近用部の境界 り、・・・・・・加入度 ）・・・・・・中間加入度 １・・・・・・白玉 ２・・・・・・小玉 以　　上 出願人　セイコーエブンン株式会社 ｌｑ賃、急しン又゛０正１ｉ図 １Ｍ第１ス（α） １５１才見、１コ負二σ）尼ｆｒ′ｒ力変ａ、　＋２１
第１図（ｂ） し 従来の２重焦点、しン又°６）正−１狛１２窮　３　図
（σ） 第　３　Ｍ　　（１＞） 症Ｌ”　ｍ）（４−クツ、（（二５．Ｃ１し＞７：　ｏ
ＩＥＢ　）５第４（沼（α） ｒ〔東０児直りク、曽１．任、し）ス゛の忌４今カラ（
、イしＩＡ 第　ｌト　図　（１〕）FIG. 1 is a front view (b) of an uninvented multifocal lens and a diagram (b) of changes in refractive power on the main gaze line. FIG. 2 is a front view of a multifocal lens according to a second embodiment. Figure 3 shows a front view of a conventional dual-state lens (Fig. 3) and a diagram of refractive power change on the main gaze line (h). FIG. 4 is a front view (c) of a conventional progressive multifocal lens and a diagram (b) of changes in refractive power on the main gaze line. FIG. 5 is an astigmatism diagram of a conventional progressive multifocal lens. 6 and 7 are astigmatism diagrams of the multi-body point lens of the present invention. AB... Main gaze line 0... Distance optical center P, Q... Boundary of near vision area,... Addition power)... ...Intermediate addition 1...Shiratama 2...Small balls and above Applicant Seiko Even Co., Ltd. lq fee, urgent sum or ゛0correct 1i Figure 1M 1st space (α) 151 talent, 1 ko minus 2 σ) n fr'r force change a, +21
Fig. 1 (b) Conventional double focus, Shinmata ° 6) Positive - 1 Koma 12 Kaku 3 Fig. (σ) 3rd M (1>) Symptom L" m) 5.C1>7: o
IEB) 5th 4th (Numa (α) r
, IA, Part 1, Figure (1))

Claims (2)

【特許請求の範囲】[Claims] （１）対向する２つの屈折面を有する眼鏡レンズであっ
て、前記２つの屈折面のうち少なくとも一方の屈折面が
、少なくとも一部分に累進的に変化する表面屈折力を有
する主として遠方視および中間視に用いる台玉部分と、
近方視のための小玉部分とにより構成されていることを
特徴とする多焦点レンズ。(1) A spectacle lens having two opposing refractive surfaces, in which at least one of the two refractive surfaces has a progressively changing surface refractive power in at least a portion, mainly for distance vision and intermediate vision. The base part used for
A multifocal lens comprising a small lens portion for near vision. （２）前記台玉部分の表面屈折力の増加分（以下では中
間加入度と呼ぶ）が＋１〔ディオプトリー〕（以後〔Ｄ
〕と略す）以下であることを特徴とする特許請求の範囲
第１項記載の多焦点レンズ。(2) The increase in the surface refractive power of the base portion (hereinafter referred to as intermediate addition power) is +1 [diopter] (hereinafter [D
] The multifocal lens according to claim 1, characterized in that: