JPH0392615U - - Google Patents
Info
- Publication number
- JPH0392615U JPH0392615U JP131390U JP131390U JPH0392615U JP H0392615 U JPH0392615 U JP H0392615U JP 131390 U JP131390 U JP 131390U JP 131390 U JP131390 U JP 131390U JP H0392615 U JPH0392615 U JP H0392615U
- Authority
- JP
- Japan
- Prior art keywords
- cam
- optical axis
- lens group
- axis direction
- cam groove
- 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
Links
- 230000003287 optical effect Effects 0.000 claims 5
- 239000002131 composite material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Lens Barrels (AREA)
Description
図は本考案に係るズームレンズの焦点位置調整
機構の一実施例を示し、第１図ａ，ｂ，ｃはピン
トバツク位置調整を行なう際のカムピンと円周カ
ム溝および直進カム溝との関係を示す展開図およ
び動作説明図、第２図はズーミング時、ピントバ
ツク調整時における第１および第２のレンズ群、
ピントバツク位置の動きを示す説明図、第３図は
ズームレンズの構成部品を示す概略斜視図、第４
図はその要部断面図、第５図は第４図の−線
断面図である。
１……ズームレンズ、２……前側ボデイ、３…
…回転筒、４……保持筒、５……第１のレンズ群
、８……直進ガイド、１０……ガイド筒、１０ａ
……直進カム溝、１２……第２のレンズ群、１３
……がた付き防止用ばね、１４……カムピン、１
６……カム筒、１６ａ……円周カム溝、１７……
クラツチ板（連結子）、１７ａ……突片、１７ｂ
……ビス止め用円弧溝、１８……ビス、２０……
延長溝部。
The figure shows an embodiment of the focal position adjustment mechanism of a zoom lens according to the present invention, and Figures 1a, b, and c show the relationship between the cam pin, the circumferential cam groove, and the linear cam groove when adjusting the focus back position. A developed diagram and an explanatory diagram of the operation are shown, and FIG. 2 shows the first and second lens groups during zooming and focus back adjustment.
FIG. 3 is a schematic perspective view showing the components of the zoom lens; FIG.
The figure is a sectional view of a main part thereof, and FIG. 5 is a sectional view taken along the line -- in FIG. 4. 1...zoom lens, 2...front body, 3...
... Rotating barrel, 4... Holding barrel, 5... First lens group, 8... Straight guide, 10... Guide barrel, 10a
... Straight cam groove, 12 ... Second lens group, 13
... Shake prevention spring, 14 ... Cam pin, 1
6...Cam cylinder, 16a...Circumferential cam groove, 17...
Clutch plate (connector), 17a... protrusion, 17b
...Circular groove for screw fixing, 18...Screw, 20...
Extension groove.
Claims (1)
る保持筒内に保持された第１のレンズ群と、 前記保持筒の後端側に固設されるガイド筒内で
直進カム溝へのカムピンの係合により光軸方向に
前後動されるとともにばねにより光軸方向の一端
側に付勢されて保持された第２のレンズ群と、 前記保持筒内でガイド筒の外周側に回動可能に
嵌装されかつ前記回転筒の回転に連動して回転さ
れることにより前記直進カム溝を介して円周カム
溝に係合するカムピンによつて第２のレンズ群を
第１のレンズ群に対し進退動作させてこれら両レ
ンズ群の合成焦点距離を変化させるカム筒と、 このカム筒を前記回転筒に対して常時は光軸方
向に移動可能な状態で連結するとともに前記両レ
ンズ群を光軸方向に前後動させてフイルム面との
距離を調整する際には相対的に回動可能な状態と
する連結子を備えてなり、 前記カム筒に形成される円周カム溝の通常使用
領域外に、このカム溝の向きとは異なる方向であ
つて前記ばねによるカムピンへの作用力を係止す
る方向に向う延長溝部を形成したことを特徴とす
るズームレンズの焦点位置調整機構。[Claims for Utility Model Registration] A first lens group held in a holding cylinder that is moved back and forth in the optical axis direction as the rotating cylinder rotates, and a first lens group that is fixed to the rear end side of the holding cylinder. a second lens group that is moved back and forth in the optical axis direction by engagement of a cam pin with a linear cam groove in the guide cylinder, and is held by being biased toward one end in the optical axis direction by a spring; A second cam pin is rotatably fitted on the outer circumferential side of the guide cylinder and is rotated in conjunction with the rotation of the rotary cylinder to engage the circumferential cam groove via the linear cam groove. a cam barrel that moves the first lens group forward and backward relative to the first lens group to change the composite focal length of both lens groups; and the cam barrel is normally movable in the optical axis direction relative to the rotating barrel. and a connector formed on the cam barrel, which connects the lens groups with each other and enables relative rotation when adjusting the distance to the film surface by moving both lens groups back and forth in the optical axis direction. The invention is characterized in that an extension groove is formed outside the normally used area of the circumferential cam groove, which faces in a direction different from the direction of the cam groove and in a direction that locks the force exerted by the spring on the cam pin. Focus position adjustment mechanism for zoom lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP131390U JP2510143Y2 (en) | 1990-01-12 | 1990-01-12 | Focus position adjustment mechanism of zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP131390U JP2510143Y2 (en) | 1990-01-12 | 1990-01-12 | Focus position adjustment mechanism of zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0392615U true JPH0392615U (en) | 1991-09-20 |
| JP2510143Y2 JP2510143Y2 (en) | 1996-09-11 |
Family
ID=31505226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP131390U Expired - Lifetime JP2510143Y2 (en) | 1990-01-12 | 1990-01-12 | Focus position adjustment mechanism of zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2510143Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005040888A1 (en) * | 2003-10-22 | 2005-05-06 | Seiko Precision Inc. | Optical module |
| JP2018105896A (en) * | 2016-12-22 | 2018-07-05 | 株式会社コシナ | Lens device of optical instrument |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7266445B2 (en) * | 2019-03-29 | 2023-04-28 | リコーインダストリアルソリューションズ株式会社 | Lens barrel and image projection device |
-
1990
- 1990-01-12 JP JP131390U patent/JP2510143Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005040888A1 (en) * | 2003-10-22 | 2005-05-06 | Seiko Precision Inc. | Optical module |
| JP2018105896A (en) * | 2016-12-22 | 2018-07-05 | 株式会社コシナ | Lens device of optical instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2510143Y2 (en) | 1996-09-11 |
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