JPH03223831A - Light projecting device for camera - Google Patents

Abstract

PURPOSE:To accomplish the focusing of a projection pattern with simple constitution by linking a 1st supporting part which supports an LED with a 2nd supporting part which supports a light projecting lens through a linking arm having flexibility and changing a relative distance between the pattern and the light projecting lens according as the linking arm is bent. CONSTITUTION:The linking arms 14a and 14b of a supporting member 14 have the flexibility, so that the rear part of the supporting member which supports the LED 10 can approach to and separate from the front part of the supporting part which supports the light projecting lens 12. Therefore, when such force that the slope 14i of the supporting member is pushed away is generated by screwing an adjusting screw 15 in, the linking arms 14a and 14b are bent and the LED 10 is moved backward and positioned, thereby changing the distance between the lens 12 and the LED 10. Thus, the focusing of the projection pattern is accomplished with the simple constitution.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、特に、焦点検出に供されるカメラ用の投光装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention particularly relates to a light projection device for a camera that is used for focus detection.

〔従来の技術］ 従来より被写体輝度が低い場合そして殊にコントラスト
が小さい場合、受動型の焦点検出装置では正確な検出は
困難になるため所定パターンを投光することが行われて
いる。この種の投光装置の構成要素を組立てる際、これ
までは部品精度の範囲内で取付は作業を行っていたわけ
であるが、そうすると余裕のある大きさのパターンを投
影するために光源エネルギーに無駄があったり、部品精
度を高めておくとコストアップになる不具合があった。[Prior Art] Conventionally, when the subject brightness is low and especially when the contrast is small, accurate detection becomes difficult with a passive focus detection device, so light is projected in a predetermined pattern. Until now, when assembling the components of this type of projector, the installation work was done within the precision of the parts, but in this case, the light source energy was wasted in order to project a pattern of a size that could be afforded. There were also problems that would increase costs if the precision of parts was improved.

一方、これまでのカメラは検出区域が画面の中央に限ら
れていたが、−眼レフカメラでは画面の異った部位に位
置する被写体に対しそれぞれ焦点検出を行うことが求め
られており、複数の検出センサを備えた焦点検出装置が
カメラに組込まれる様になってきている。On the other hand, with conventional cameras, the detection area was limited to the center of the screen, but with eye reflex cameras, it is required to perform focus detection for subjects located in different parts of the screen. Focus detection devices equipped with detection sensors have come to be incorporated into cameras.

その場合、投影パターンをいずれの検出センサも良好に
受像する様になっている必要があるため、従来に比して
高い精度で装置が出来上がっている必要がある。In this case, since it is necessary that the projected pattern is received well by each detection sensor, the apparatus needs to be manufactured with higher precision than in the past.

［発明が解決しようとしている課題］ 本発明は上述の無駄を解消し、あるいは高精度の調整を
可能にすることを課題とする。[Problems to be Solved by the Invention] An object of the present invention is to eliminate the above-mentioned waste or to enable highly accurate adjustment.

〔課題を解決するための手段］ 本発明は、光源となるＬＥＤと、該ＬＥＤの放射光を物
体に導くための投光レンズと、該投光レンズと前記ＬＥ
Ｄとを支持する支持部材と、該支持部材を固定する基体
とを有するカメラの投光装置において、前記支持部材は
前記ＬＥＤを支持する第１の支持部と、前記投光レンズ
を支持する第２の支持部とを有し、該第１の支持部と該
第２の支持部とは可撓性を有する連結腕を介して結合さ
れ、該アーム部の撓みに伴って、前記パターンと前記投
光レンズとの相対距離が変化するように構成したことに
より、極めて簡単な構成で、投影パターンのピント調整
を可能としたものである。[Means for Solving the Problems] The present invention provides an LED serving as a light source, a light projection lens for guiding emitted light from the LED to an object, and a combination of the light projection lens and the LED.
D, and a base body to which the support member is fixed. The first support part and the second support part are connected via a flexible connecting arm, and as the arm part bends, the pattern and the second support part are connected. By configuring it so that the relative distance to the projection lens changes, it is possible to adjust the focus of the projection pattern with an extremely simple configuration.

［実施例］ 第１図〜第７図は本発明による実施例であり、第１図は
一眼レフカメラに本投光装置を組込んだ場合の一形態を
示す断面図である０図中１はカメラ本体、２は結像レン
ズ３をその光軸方向に移動可能に保持するレンズ鏡筒、
４は被写体光を焦点検出装置５とファインダー系へ分割
するハーフミラ−６はピント板でペンタプリズム７、接
眼レンズ８と共にファインダー系を構成する。９はハー
フミラ−４を透過した光束を周知の複数の箇所の検出可
能焦点検出装置５へ導くためのサブミラーである。１０
はＬＥＤで発光源の保護と光線の指向方向を調整するド
ーム１１、投光レンズ１２と共に焦点検出用の補助光投
光系を構成する。１３はＬＥＤのパッケージである。補
助光投光系は後述のワークによりユニット化され、例え
ばカメラ本体に組込まれる。[Example] Figures 1 to 7 show examples according to the present invention, and Figure 1 is a cross-sectional view showing an embodiment of the present projector incorporated into a single-lens reflex camera. 2 is a camera body; 2 is a lens barrel that holds the imaging lens 3 movably in the direction of its optical axis;
Reference numeral 4 denotes a half mirror 6 which divides the subject light into a focus detection device 5 and a finder system. A half mirror 6 is a focusing plate and together with a pentaprism 7 and an eyepiece 8 constitutes a finder system. Reference numeral 9 denotes a submirror for guiding the light beam transmitted through the half mirror 4 to a known focus detection device 5 at a plurality of locations. 10
constitutes an auxiliary light projecting system for focus detection together with a dome 11 and a projecting lens 12, which protect the light emitting source using LEDs and adjust the directing direction of the light beam. 13 is an LED package. The auxiliary light projecting system is made into a unit by a work described below, and is incorporated into, for example, a camera body.

ＬＥＤＩＯは第２図に斜線で示したような発光部形状を
有しており、このパターンが被写体に投影され、焦点検
出のための被写体情報となる。The LEDIO has a light emitting part shape as shown by diagonal lines in FIG. 2, and this pattern is projected onto the subject and becomes subject information for focus detection.

第３図〜第５図は補助光投光ユニットの詳細図であって
、第３図は構成要素の斜視図、第４図は組立状態の斜視
図である。図において、１４は支持部材で、ＬＥＤＩＯ
パッケージ１３、ドーム１１および投光レンズ１２を支
持する。１５は調整用ビスで支持部材１１の位置調整に
使われるものである。ドーム１１には支持部材１４に接
する面にビンｌｌｃ、Ｉｌｄが設けられ、支持部材１４
の位置決め穴１４ｃ、同斜め長穴１４ｄに貫通し支持さ
れる。一方、このドームに対して、ＬＥＤのパッケージ
１３が光軸゛を合わせて透明接着剤にて固着されている
ものとする。3 to 5 are detailed views of the auxiliary light projection unit, with FIG. 3 being a perspective view of the components, and FIG. 4 being a perspective view of the assembled state. In the figure, 14 is a support member, and the LEDIO
It supports the package 13, dome 11 and light projecting lens 12. Numeral 15 is an adjustment screw used for adjusting the position of the support member 11. The dome 11 is provided with bottles llc and Ild on the surface that is in contact with the support member 14, and the support member 14
It penetrates and is supported by the positioning hole 14c and the oblique elongated hole 14d. On the other hand, it is assumed that an LED package 13 is fixed to this dome with a transparent adhesive with its optical axis aligned.

１４ａ、１４ｂは可撓性連結腕で、支持部材の前部１４
Ｆと後部１４Ｒを連結している。投光レンズ１２はユニ
ットの組立途中にあってはその翼部１２ｅ、１２ｆの取
付面が組立治具によって、支持部材１４の固定用柱体１
４ｅ、１４ｆの取付面に対して平面同志で圧接されてお
り、ＬＥＤｌＯより発した光束が、この投光レンズを介
して、焦点検出装置５の測距視野内にある調整用被写体
上に到達するよう光軸の偏心調整が矢印Ａ。14a, 14b are flexible connecting arms, which connect the front part 14 of the support member.
Connects F and rear 14R. During assembly of the projector lens 12, the mounting surfaces of its wing parts 12e and 12f are attached to the fixing column 1 of the support member 14 by an assembly jig.
They are pressed against the mounting surfaces of 4e and 14f on a plane-to-plane basis, and the light flux emitted from the LEDlO reaches the adjustment subject within the distance measurement field of the focus detection device 5 via this projection lens. Arrow A indicates eccentric adjustment of the optical axis.

Ｂ方向について行われ、調整終了後、固定用柱体１４ｅ
、１４ｆと翼部１２ｅ、１２ｆとの間で接着剤を使って
接着が行われる。１２ｇ、１２ｈはこの偏心調整に使わ
れる治具保持用の調整孔である。After the adjustment is completed in the B direction, the fixing column 14e
, 14f and the wing portions 12e, 12f are bonded using adhesive. 12g and 12h are adjustment holes for holding a jig used for this eccentric adjustment.

第５図は投光ユニットがカメラ本体の基体１６に対して
固定された状態を示す断面図である。FIG. 5 is a sectional view showing a state in which the light projection unit is fixed to the base 16 of the camera body.

基体１６にはスライドガイド部１６ｋ、固定ビン１６ｊ
およびネジ穴１６βが設けられており、支持部材１４の
固定穴１４ｊに固定ビ１６ｊが圧入され、さらに支持部
材１４のガイド溝１４ｋにスライドガイド部１６ｋが摺
動可能に嵌合している。また、ＵｆＪ整ビス１５は支持
部材１４の底部を挟み込んで基体１６と螺合している。The base body 16 includes a slide guide portion 16k and a fixed bottle 16j.
A fixing screw 16j is press-fitted into the fixing hole 14j of the support member 14, and a slide guide portion 16k is slidably fitted into the guide groove 14k of the support member 14. Further, the UfJ screw 15 is screwed into the base 16 with the bottom of the support member 14 sandwiched therebetween.

支持部材１４には調整ビス１５の頭部１５ｉと接する斜
面１４ｉが設けられており、調整ビス１５の回転による
進退に伴ってＬＥＤＩＯ、ドーム１１を矢印Ｃ方向に移
動させるような分力を発生している。The support member 14 is provided with a slope 14i that contacts the head 15i of the adjustment screw 15, and generates a component force that moves the LEDIO and dome 11 in the direction of arrow C as the adjustment screw 15 moves forward and backward by rotation. ing.

第６図および第７図を用いて矢印Ｃ方向に加わる力を利
用した投影パターンのピント調整について説明する。第
６図、第７図は投光ユニットを上方より見た平面図であ
り、第６図は調整ビス１５が第５図に示した位置の場合
、第７図は調整ビスがさらにねじ込まれた場合をそれぞ
れ示している。支持部材１４の連結腕１４ａ、１４ｂは
可撓性を有し、ＬＥＤＩＯを支持した支持部材の後部と
、投光レンズを支持した前部の近接・離間を可能にして
いる。従って、調整ビス１５のねじ込みによって支持部
材の斜面１４ｉが押しのけられるような力が発生すると
、この連結腕１４ａ、１４ｂが撓んで、ＬＥＤの位置が
後方に移動する。すなわち、第７図における投光レンズ
１２とＬＥＤｌｏとの距離は、第６図における投光レン
ズ１２とＬＥＤ　１０との距離に比べ大きくなっている
。Focus adjustment of a projection pattern using a force applied in the direction of arrow C will be described with reference to FIGS. 6 and 7. Figures 6 and 7 are plan views of the light projecting unit viewed from above. Figure 6 shows the adjustment screw 15 in the position shown in Figure 5, and Figure 7 shows the adjustment screw 15 screwed in further. Each case is shown. The connecting arms 14a and 14b of the support member 14 are flexible, and enable the rear part of the support member that supports the LEDIO to be brought close to or separated from the front part that supports the projecting lens. Therefore, when a force is generated that pushes away the slope 14i of the support member by screwing in the adjustment screw 15, the connecting arms 14a and 14b are bent, and the position of the LED is moved rearward. That is, the distance between the light projecting lens 12 and the LEDlo in FIG. 7 is larger than the distance between the light projecting lens 12 and the LED 10 in FIG.

このように、各部品の製造誤差によって発生する投影パ
ターンのピントズレは、ピント位置をモニタしながら調
整ビス１５を進退させることで補正することが可能であ
る。In this way, the out-of-focus of the projection pattern caused by manufacturing errors of each component can be corrected by moving the adjustment screw 15 forward and backward while monitoring the focus position.

以上のように、投光レンズ１２の平行偏芯で投光方向の
調整を、ＬＥＤの前後移動で投影パターン像のピント調
整を行っているため、この２つの調整は独立に行うこと
が可能であり、極めて組立作業性が良い。As described above, since the direction of light projection is adjusted by the parallel eccentricity of the light projection lens 12, and the focus of the projected pattern image is adjusted by moving the LED back and forth, these two adjustments can be performed independently. Yes, it is extremely easy to assemble.

尚、基体１６はカメラ本体に着脱自在のケージングでも
良い、又、上側では支持体の前部が基体に対して固定で
あるが、後部が固定でも良い、パターンは別途ネガフィ
ルムに設け、これを照明する様にしても良い。The base 16 may be a cage that is detachable from the camera body, and the front part of the support is fixed to the base on the upper side, but the rear part may also be fixed.The pattern is provided separately on a negative film, and this is It may also be illuminated.

［発明の効果） 支持部材は投光レンズを支持する第１の支持部と、ＬＥ
Ｄを支持する第２の支持部とを有し、該第１の支持部と
該第２の支持部とは可撓弾性を有する連結腕を介して結
合され、該撓みに伴って、前記パターンと前記投光レン
ズとの相対距離が変化するように構成したことにより、 （１）極めて簡単な構成で投影パターンのピント調整が
可能となる。[Effect of the invention] The support member includes a first support portion that supports the light projecting lens, and an LE
A second support part that supports D, the first support part and the second support part are connected via a flexible connecting arm, and as the pattern is bent, the pattern By configuring so that the relative distance between the projection lens and the projection lens changes, (1) focus adjustment of the projection pattern becomes possible with an extremely simple configuration.

（２）部品点数が少ないため安価である。(2) It is inexpensive because it has a small number of parts.

と云う効果がある。There is an effect called.

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

第１図は本発明による投光装置を一眼レフカメラに組込
んだ例を示す断面図、 第２図はＬＥＤの発光部形状を示す説明図、第３図およ
び第４図は投光装置の斜視図、第５図は投光装置の断面
図、 第６図および第７図は夫々投光装置の上面図である。 図中、１０はＬＥＤ、１２は投光レンズ、１４は支持部
材、１４ａ、１４ｂは連結腕、１６は基体。 ７４ｋ ｔη 第６図 １２ 、ｔ ３Fig. 1 is a sectional view showing an example in which a light projecting device according to the present invention is incorporated into a single-lens reflex camera, Fig. 2 is an explanatory diagram showing the shape of the light emitting part of an LED, and Figs. 3 and 4 are views of the projecting device. A perspective view, FIG. 5 is a sectional view of the light projecting device, and FIGS. 6 and 7 are top views of the light projecting device. In the figure, 10 is an LED, 12 is a light projection lens, 14 is a support member, 14a, 14b are connecting arms, and 16 is a base. 74k tη Figure 6 12, t 3

Claims (1)

【特許請求の範囲】 光源となるＬＥＤと、該ＬＥＤの放射光束を被写体に導
くための投光レンズと、該投光レンズと前記ＬＥＤとを
支持する支持部材と、該支持部材を固定する基体とを有
するカメラの投光装置において、 前記支持部材は前記ＬＥＤを支持する第１の支持部と、
前記投光レンズを支持する第２の支持部とを有し、該第
１の支持部と該第２の支持部とは可撓性を有する連結腕
を介して結合され、該連結腕の撓みに伴って、前記ＬＥ
Ｄと前記投光レンズとの相対距離が変化するように構成
したことを特徴とするカメラの投光装置。[Scope of Claims] An LED serving as a light source, a projection lens for guiding the emitted light flux of the LED to a subject, a support member that supports the projection lens and the LED, and a base that fixes the support member. In the camera light projection device, the support member includes a first support portion that supports the LED;
a second support part that supports the light projecting lens, the first support part and the second support part are connected via a flexible connecting arm, and the bending of the connecting arm Accordingly, the LE
A light projecting device for a camera, characterized in that the relative distance between D and the light projecting lens is configured to change.