JPH02178642A - Lens position detecting device - Google Patents

Lens position detecting device

Info

Publication number
JPH02178642A
JPH02178642A JP33309388A JP33309388A JPH02178642A JP H02178642 A JPH02178642 A JP H02178642A JP 33309388 A JP33309388 A JP 33309388A JP 33309388 A JP33309388 A JP 33309388A JP H02178642 A JPH02178642 A JP H02178642A
Authority
JP
Japan
Prior art keywords
light
lens
light receiving
light emitting
focus ring
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.)
Pending
Application number
JP33309388A
Other languages
Japanese (ja)
Inventor
Takashi Terasaka
寺坂 琢史
Kimio Tokuda
徳田 公男
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP33309388A priority Critical patent/JPH02178642A/en
Publication of JPH02178642A publication Critical patent/JPH02178642A/en
Pending legal-status Critical Current

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  • Length Measuring Devices By Optical Means (AREA)
  • Focusing (AREA)
  • Lens Barrels (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To detect the position of a lens without contacting and to improve the durability and stability by providing a light shield part provided on the outer peripheral surface of a focus ring and pairs of light emitting elements and light receiving elements arranged opposite each other across the light shield part. CONSTITUTION:The light shield part 15 which is intermittent in an arcuate disk shape having its center on an optical axis 14 is projected from the outer peripheral surface of the focus ring 11. On a sensor fixing jig 16 fixed on the outer peripheral surface of a lens barrel main body 13, a light emitting element 17a and a light receiving element 18a are arranged at the upper side and a light emitting element 17b and a light receiving element 18b are arranged opposite each other across the light shield part 15 respectively. The light emitting elements 17a and 17b and light receiving elements 18a and 18b are fixed on the sensor fixing jig 16 vertically almost in the normal direction of the focus ring 11 and joined with a detecting circuit printed board 19 engaged with the sensor fixing jig 16. Consequently, the detection with high durability and stability is performed without optical contacting.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はビデオカメラあるいはカメラ一体型ビデオテー
プレコーダ(以下、カメラ一体型VTRという)におけ
るオートフォーカスレンズのレンズ位置検出装置に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens position detection device for an autofocus lens in a video camera or a camera-integrated video tape recorder (hereinafter referred to as a camera-integrated VTR).

従来の技術 近年、ビデオテープレコーダ(以下VTRという)の曹
及が目ざましく、またビデオカメラあるいはカメラ一体
型VTRの小型軽量化により、カメラ撮りを楽しむ機会
も増加している。カメラ撮りを行う場合、簡単確実に撮
れると言う点からオートフォーカス(以下、AFという
)機構が不可欠な要素になりつつある。AFIl構を正
確に動作させるためにはフォーカス、ズーム等の状態を
検出しなければならず、そのためにレンズ位置検出装置
が必要である。以下図面を参照しながら従来のレンズ位
置検出装置の一例について説明する。
2. Description of the Related Art In recent years, the popularity of video tape recorders (hereinafter referred to as VTRs) has been remarkable, and as video cameras and camera-integrated VTRs have become smaller and lighter, opportunities for enjoying camera photography have also increased. When taking pictures with a camera, an autofocus (hereinafter referred to as AF) mechanism is becoming an essential element because it allows easy and reliable photography. In order to operate the AFIl structure accurately, it is necessary to detect the states of focus, zoom, etc., and a lens position detection device is required for this purpose. An example of a conventional lens position detection device will be described below with reference to the drawings.

第3図はフォーカスの状態を検出するために用いた従来
のレンズ位置検出装置の断面図、第4図は同レンズ位置
検出装置の一部切欠き右側面図である。第3図および第
4図に示すレンズ位置検出装置において、フォーカスリ
ング2はレンズ光軸7を中心に回動可能である。フォー
カスリング2の外周部には駆動ビン2aが突設されてお
り、接点4を固定したスライダー3の溝部3aと遊嵌し
ている、また、レンズ位置検出装置1の両側面には、レ
ンズ光軸7を中心とした円弧状に形成したケース5の内
部に案内溝5aが設けられており、前設スライダー3は
この案内溝5aと遊嵌しレンズ光軸7を中心に回動可能
である・、スライダー3に固定された接点4の先端4a
はケース5の内部に保持されたプリント基板(以下、P
板という)6の内面に接触している。したがってフォー
カスリング2をレンズ光軸7を中心として回動させると
接点4の先端4aはP板6の上を摺動する。なお第4図
に示すようにP板6の上には導電部5a。
FIG. 3 is a sectional view of a conventional lens position detection device used to detect the focus state, and FIG. 4 is a partially cutaway right side view of the same lens position detection device. In the lens position detection device shown in FIGS. 3 and 4, the focus ring 2 is rotatable about the lens optical axis 7. As shown in FIG. A drive pin 2a is protruded from the outer circumference of the focus ring 2, and loosely fits into the groove 3a of the slider 3 to which the contact 4 is fixed. A guide groove 5a is provided inside the case 5 formed in an arc shape around the shaft 7, and the front slider 3 is loosely fitted into the guide groove 5a and can rotate around the lens optical axis 7.・Tip 4a of contact 4 fixed to slider 3
is a printed circuit board (hereinafter referred to as P) held inside the case 5.
It is in contact with the inner surface of plate 6). Therefore, when the focus ring 2 is rotated about the lens optical axis 7, the tip 4a of the contact 4 slides on the P plate 6. Incidentally, as shown in FIG. 4, a conductive portion 5a is provided on the P plate 6.

6b、6cが接点4の先端4aと対向する位置に設けら
れている。なお8はズームリングである。
6b and 6c are provided at positions facing the tip 4a of the contact 4. Note that 8 is a zoom ring.

上記のレンズ位置検出装置において、フォーカスリング
2がレンズ光軸7を中心として矢印Aと逆方向に回動し
、接点4の先端4aがXの位置にあるとき、第4図から
明らかなように、導電部6aと導電部6bは接点4によ
って導通する。同様に接点4の先端4aがA方向に回動
し、XとYの位置の間にあるときは導電部6a、6b、
6cの間の導通はない。
In the above lens position detection device, when the focus ring 2 rotates in the opposite direction to the arrow A around the lens optical axis 7 and the tip 4a of the contact 4 is at the position X, as is clear from FIG. , the conductive portion 6a and the conductive portion 6b are electrically connected through the contact 4. Similarly, when the tip 4a of the contact 4 rotates in the A direction and is between the X and Y positions, the conductive parts 6a, 6b,
There is no conduction between 6c.

次にYと2の位置の間では導電部6aと導電部6Cが導
通する。そしてZの位置では導電部6a。
Next, between the positions Y and 2, the conductive portion 6a and the conductive portion 6C are electrically connected. And at the Z position, there is a conductive part 6a.

6 b * 6 cはすべて導通する。したがって、X
の位置をフォーカスのωの位置、Zの位置を最近距離の
位置とし、Yの位置を■と最近距離とのほぼ中間位置と
すれば、導電部6a、 6 b + 6 cの間の導通
を調べれば、フォーカスを動作させた場合のレンズ位置
を検出することができる。また、ズームを動作させた場
合のレンズ位置を検出する場合も同様な方法で行うこと
ができる。
6b*6c are all conductive. Therefore, X
If the position is set to the focus ω position, the Z position is the closest distance position, and the Y position is approximately midway between If you check, you can detect the lens position when the focus is activated. Furthermore, a similar method can be used to detect the lens position when the zoom is operated.

発明が解決しようとする課題 しかしながら上記のような構造では、半径方向にスライ
ダー3、接点4、P板6、ケース5が位置し、なおかつ
、接点4はフォーカスリング2と一体となって回動(回
転角は約100 ’ )するため、半径方向および円周
方向に対して非常に大きく、重量的にも重くなる。また
部品点数も多く精度も要求され、組立工数もかかるので
コストアップになる。したがって最近のビデオカメラあ
るいはカメラ一体型VTRの小型軽量化、低コスト化な
どのさまたげとなる。また上記の方法では位1の検出を
接点4とP板6の接触によって行っており、接点4の先
端4aは常にP板6上を摺動しているため耐久性、安定
性などの点で非常に問題がある。
Problems to be Solved by the Invention However, in the above structure, the slider 3, contact 4, P plate 6, and case 5 are located in the radial direction, and the contact 4 rotates integrally with the focus ring 2 ( Since the rotation angle is approximately 100'), it is very large in the radial and circumferential directions and is heavy in weight. In addition, the number of parts is large, precision is required, and assembly man-hours are required, which increases costs. This hinders efforts to make recent video cameras or camera-integrated VTRs smaller, lighter, and lower in cost. In addition, in the above method, the position 1 is detected by the contact between the contact 4 and the P plate 6, and the tip 4a of the contact 4 is always sliding on the P plate 6, so there are problems with durability and stability. Very problematic.

この耐久性、安定性といった要素は、長時間連続使用す
ることの多いビデオカメラやカメラ一体型VTRにとっ
て非常に重要である。
Elements such as durability and stability are very important for video cameras and camera-integrated VTRs that are often used continuously for long periods of time.

本発明は上記課題を解消するもので、小型軽量かつ低コ
ストで耐久性、安定性の高いレンズ位置検出装置を提供
することを目的とするものである。
The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a lens position detection device that is small, lightweight, low cost, and highly durable and stable.

課題を解決するための手段 上記課題を解決するために本発明のレンズ位置検出装置
は、合焦レンズ群および変倍レンズ群を保持したレンズ
鐘胴本体で支持するセンサー固定治具に配設した少なく
とも1組の対向する発光手段および受光手段と、前記合
焦レンズ群の移動を行うためのフォーカス操作手段およ
び前記変倍レンズ群の移動を行うためのズーム操作手段
のうち少なくとも一方に断続的に設けた前記発光手段と
受光手段の間に介在させる遮光手段と、前記受光手段の
出力を判断する判断手段とを備えている。
Means for Solving the Problems In order to solve the above problems, the lens position detection device of the present invention is arranged in a sensor fixing jig supported by a lens barrel body holding a focusing lens group and a variable magnification lens group. At least one set of light emitting means and light receiving means facing each other, a focus operation means for moving the focusing lens group, and a zoom operation means for moving the variable power lens group intermittently. The light-shielding means is provided between the light-emitting means and the light-receiving means, and the determining means determines the output of the light-receiving means.

作用 この構成によって、レンズの位置検出を、所定の位置に
固定された発光手段からの投光を、フォーカス操作手段
やズーム操作手段に断続的に設けられた遮光手段を介し
て、受光手段で受光の有無を検出することにより光学的
に非接触で行うことができ、したがって、非常に耐久性
、安定性の高い検出が可能であり、しかも部品点数も少
なく、組立工数も少なくできるため、非常に小型軽量化
かつ低コストで製作することができる。
Effect With this configuration, the position of the lens is detected by detecting the light emitted from the light emitting means fixed at a predetermined position, and receiving the light by the light receiving means via the light shielding means provided intermittently on the focus operation means and the zoom operation means. By detecting the presence or absence of It can be manufactured in a smaller size, lighter weight, and at lower cost.

実施例 以下、本発明の一実施例について、図面を参照しながら
説明する。
EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

第1図はフォーカスの状態を検出するために用いた本発
明の一実施例におけるレンズ位置検出装置の側面図、同
レンズ位置検出装置の一部切欠き正面図である。第1図
、第2図において、フォーカスリング11およびズーム
リング12は、被写体像を合焦するための合焦レンズ群
および被写木像を変倍するための変倍レンズ群(いずれ
も図示せず)を保持したレンズ鏡胴本体13の外周上で
レンズ光軸14を中心としてそれぞれ所定の角度回転自
在である。フォーカスリング11の外周面上には光軸1
4を中心とした円弧状に板状の断続的な遮光部15が突
出している。また、レンズ鏡胴本体13の外周面上に固
定されたセンサー固定治具16に、上側に発光素子17
aと受光素子18aが、下側に発光素子17bと受光素
子18bが、それぞれ遮光部15を挟んで対向して配設
されている。遮光部15は、上側の発光素子17aから
受光素子18aへの投光を遮光する部分15aと、下側
の発光素子17bから受光素子18bへの投光を遮光す
る両端の部分15b、15cとで形成されている0発光
素子17a、 17bおよび受光素子18a 、 18
bはそれぞれセンサー固定治具16上で、フォーカスリ
ング11のほぼ法線方向に上下に固定されていて、セン
サー固定治具16に係合した検知回路プリント基板19
に接合されている。検知回路プリント基板19には、受
光素子18aおよび受光素子18bの出力を判断するた
めの検知回路が設けられている。
FIG. 1 is a side view of a lens position detection device according to an embodiment of the present invention used to detect a focus state, and a partially cutaway front view of the same lens position detection device. In FIGS. 1 and 2, the focus ring 11 and the zoom ring 12 are a focusing lens group for focusing the subject image and a variable magnification lens group for changing the magnification of the subject tree image (both are not shown). The lenses are rotatable at predetermined angles around the lens optical axis 14 on the outer periphery of the lens barrel body 13 holding the lenses. The optical axis 1 is located on the outer peripheral surface of the focus ring 11.
A plate-shaped intermittent light shielding portion 15 protrudes in an arc shape centered at 4. In addition, a light emitting element 17 is attached to the upper side of the sensor fixing jig 16 fixed on the outer peripheral surface of the lens barrel body 13.
The light emitting element 17b and the light receiving element 18b are disposed facing each other with the light shielding part 15 in between. The light blocking portion 15 includes a portion 15a that blocks light from being emitted from the upper light emitting element 17a to the light receiving element 18a, and portions 15b and 15c at both ends that block light from being emitted from the lower light emitting element 17b to the light receiving element 18b. The formed light emitting elements 17a, 17b and light receiving elements 18a, 18
b are fixed vertically on the sensor fixing jig 16 in substantially the normal direction of the focus ring 11, and detecting circuit printed circuit boards 19 engaged with the sensor fixing jig 16;
is joined to. The detection circuit printed circuit board 19 is provided with a detection circuit for determining the outputs of the light receiving elements 18a and 18b.

以上の本実施例のレンズ位置検出装置における動作を説
明する。
The operation of the lens position detection device of this embodiment described above will be explained.

第2図において、フォーカスリング11がレンズ光軸1
4を中心として矢印Bの方向に回動し、フォーカスリン
グ11のPの位置が発光素子17aおよび17bと対向
するとき、遮光部分15aおよび15bにより、受光素
子18aおよび18bの出力信号はともに低レベルとな
る。同様にフォーカスリング11がレンズ光軸14を中
心としてBと逆方向に回動し、フォーカスリング11の
PとQの位置の間に発光素子17aおよび17bがある
ときは、遮光部分15aにより受光素子18aの出力信
号は低レベルとなり、受光素子18bの出力信号は高レ
ベルとなる。
In FIG. 2, the focus ring 11 is located at the lens optical axis 1.
When the focus ring 11 rotates in the direction of the arrow B around 4 and the position P of the focus ring 11 faces the light emitting elements 17a and 17b, the output signals of the light receiving elements 18a and 18b are both at a low level due to the light shielding parts 15a and 15b. becomes. Similarly, when the focus ring 11 rotates in the opposite direction to B around the lens optical axis 14 and there are light emitting elements 17a and 17b between positions P and Q of the focus ring 11, the light receiving element is The output signal of the light receiving element 18a becomes a low level, and the output signal of the light receiving element 18b becomes a high level.

次にQとRの位置の間では受光素子18aおよび18b
の出力信号はともに高レベルとなる。そしてRの位置で
は遮光部分15cにより受光素子18bの出力信号は低
レベルとなり、受光素子18aの出力信号は高レベルと
なる。したがって、Pの位置をフォーカスのωの位置、
Rの位置を最近距離の位置とし、Qの位置を■と最近距
離とのほぼ中間位置とすれば、受光素子18aおよび1
8bの出力信号を調べれば、フォーカスリング11を動
作させた場合のレンズ位置を検出することができる。ま
た、ズームリング12を動作させた場合のレンズ位置を
検出する場合も、同様な構造のレンズ位置検出装置によ
り行うことができる。
Next, between the Q and R positions, the light receiving elements 18a and 18b
Both output signals are at high level. At position R, the output signal of the light receiving element 18b becomes a low level due to the light blocking portion 15c, and the output signal of the light receiving element 18a becomes a high level. Therefore, the position of P is the position of focus ω,
If the position of R is the closest distance, and the position of Q is approximately halfway between ■ and the closest distance, then the light receiving elements 18a and 1
By examining the output signal 8b, it is possible to detect the lens position when the focus ring 11 is operated. Furthermore, when detecting the lens position when the zoom ring 12 is operated, a lens position detection device having a similar structure can be used.

以上のように本実施例によれば、フォーカスリング11
の外周面上に設けた遮光部15と、この遮光部15を挟
み対向するように配設した発光素子17aと受光素子1
8aおよび発光素子17bと受光素子18bにより、レ
ンズの位置検出を非接触で行うことができて耐久性、安
定性を高めることができ、部品点数も少なく、組立性も
良く、小型軽量化かつ低コスト化することができる。
As described above, according to this embodiment, the focus ring 11
A light-emitting element 17a and a light-receiving element 1 are arranged to face each other with the light-shielding part 15 in between.
8a, the light-emitting element 17b, and the light-receiving element 18b, the position of the lens can be detected in a non-contact manner, increasing durability and stability.The number of parts is small, and the assembly is easy, making it compact, lightweight, and low-cost. It can be reduced to cost.

発明の効果 以上のように本発明のレンズ位置検出装置は、フォーカ
ス操作手段およびズーム操作手段のうち少なくとも一方
に設けた遮光手段と、レンズ鏡胴本体で支持したセンサ
ー固定治具に前記遮光手段を挟み対向するように配設し
た少なくとも一組の発光手段および受光手段とを備えて
いることにより、レンズの位置検出が非接触で行え、耐
久性、安定性を高めることができ、しかも部品点数も少
なく、組立性も良く、小型軽量化かつ低コスト化するこ
とができるという優れた効果を奏する。
Effects of the Invention As described above, the lens position detection device of the present invention includes a light shielding means provided on at least one of the focus operation means and the zoom operation means, and a sensor fixing jig supported by the lens barrel body. By including at least one set of light emitting means and light receiving means disposed to face each other, the position of the lens can be detected without contact, increasing durability and stability, and reducing the number of parts. It has excellent effects such as small size, light weight, and low cost.

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

第1図は本発明の一実施例におけるレンズ位置検出装置
の側面図、第2図は同レンズ位置検出装置の一部切欠き
正面図、第3図は従来のレンズ位置検出装置の断面図、
第4図は同レンズ位置検出装置の一部切欠右側面図であ
る。 11・・・フォーカスリング(フォーカス操作手段)、
12・・・ズームリング(ズーム操作手段)、13・・
・レンズ鐘胴本体、15・・・遮光部(遮光手段)、1
6・・・センサー固定治具、17a 、 17b・・・
発光素子(発光手段) 、18a、 18b・・・受光
素子(受光手段)、19・・・検知回路プリント基板(
判断手段)。 代理人   森  本  義  弘 第 図 第 図
FIG. 1 is a side view of a lens position detection device according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the same lens position detection device, and FIG. 3 is a sectional view of a conventional lens position detection device.
FIG. 4 is a partially cutaway right side view of the lens position detection device. 11...Focus ring (focus operation means),
12...Zoom ring (zoom operation means), 13...
・Lens bell body, 15... Light shielding part (light shielding means), 1
6...Sensor fixing jig, 17a, 17b...
Light emitting element (light emitting means), 18a, 18b... Light receiving element (light receiving means), 19... Detection circuit printed board (
means of judgment). Agent: Yoshihiro Morimoto

Claims (1)

【特許請求の範囲】[Claims] 1、合焦レンズ群および変倍レンズ群を保持したレンズ
鏡胴本体で支持するセンサー固定治具に配設した少なく
とも1組の対向する発光手段および受光手段と、前記合
焦レンズ群の移動を行うためのフォーカス操作手段およ
び前記変倍レンズ群の移動を行うためのズーム操作手段
のうち少なくとも一方に断続的に設けた前記発光手段と
受光手段の間に介在させる遮光手段と、前記受光手段の
出力を判断する判断手段とを備えたことを特徴とするレ
ンズ位置検出装置。
1. At least one set of opposing light-emitting means and light-receiving means disposed on a sensor fixing jig supported by a lens barrel body holding a focusing lens group and a variable power lens group, and movement of the focusing lens group. a light shielding means interposed between the light emitting means and the light receiving means, which are intermittently provided on at least one of the focus operating means for moving the variable magnification lens group and the zoom operating means for moving the variable magnification lens group; 1. A lens position detection device, comprising: judgment means for judging an output.
JP33309388A 1988-12-29 1988-12-29 Lens position detecting device Pending JPH02178642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33309388A JPH02178642A (en) 1988-12-29 1988-12-29 Lens position detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33309388A JPH02178642A (en) 1988-12-29 1988-12-29 Lens position detecting device

Publications (1)

Publication Number Publication Date
JPH02178642A true JPH02178642A (en) 1990-07-11

Family

ID=18262196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33309388A Pending JPH02178642A (en) 1988-12-29 1988-12-29 Lens position detecting device

Country Status (1)

Country Link
JP (1) JPH02178642A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04244346A (en) * 1991-01-31 1992-09-01 Shin Etsu Handotai Co Ltd Monocrystal bar clamp positioning jig and monocrystal bar clamp positioning method using this jig
KR101044150B1 (en) * 2009-08-17 2011-06-24 삼성전기주식회사 Camera module

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04244346A (en) * 1991-01-31 1992-09-01 Shin Etsu Handotai Co Ltd Monocrystal bar clamp positioning jig and monocrystal bar clamp positioning method using this jig
JP2792246B2 (en) * 1991-01-31 1998-09-03 信越半導体株式会社 Single crystal rod clamp positioning jig and single crystal rod clamp positioning method using the same
KR101044150B1 (en) * 2009-08-17 2011-06-24 삼성전기주식회사 Camera module

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